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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> | |
58 | #include <linux/mmu_context.h> | |
59 | #include <linux/percpu.h> | |
60 | #include <linux/slab.h> | |
6c271ce2 | 61 | #include <linux/kthread.h> |
2b188cc1 | 62 | #include <linux/blkdev.h> |
edafccee | 63 | #include <linux/bvec.h> |
2b188cc1 JA |
64 | #include <linux/net.h> |
65 | #include <net/sock.h> | |
66 | #include <net/af_unix.h> | |
6b06314c | 67 | #include <net/scm.h> |
2b188cc1 JA |
68 | #include <linux/anon_inodes.h> |
69 | #include <linux/sched/mm.h> | |
70 | #include <linux/uaccess.h> | |
71 | #include <linux/nospec.h> | |
edafccee JA |
72 | #include <linux/sizes.h> |
73 | #include <linux/hugetlb.h> | |
aa4c3967 | 74 | #include <linux/highmem.h> |
15b71abe JA |
75 | #include <linux/namei.h> |
76 | #include <linux/fsnotify.h> | |
4840e418 | 77 | #include <linux/fadvise.h> |
3e4827b0 | 78 | #include <linux/eventpoll.h> |
ff002b30 | 79 | #include <linux/fs_struct.h> |
7d67af2c | 80 | #include <linux/splice.h> |
b41e9852 | 81 | #include <linux/task_work.h> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
93 | |
94 | /* | |
95 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
96 | */ | |
97 | #define IORING_FILE_TABLE_SHIFT 9 | |
98 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
99 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
100 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
2b188cc1 JA |
101 | |
102 | struct io_uring { | |
103 | u32 head ____cacheline_aligned_in_smp; | |
104 | u32 tail ____cacheline_aligned_in_smp; | |
105 | }; | |
106 | ||
1e84b97b | 107 | /* |
75b28aff HV |
108 | * This data is shared with the application through the mmap at offsets |
109 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
110 | * |
111 | * The offsets to the member fields are published through struct | |
112 | * io_sqring_offsets when calling io_uring_setup. | |
113 | */ | |
75b28aff | 114 | struct io_rings { |
1e84b97b SB |
115 | /* |
116 | * Head and tail offsets into the ring; the offsets need to be | |
117 | * masked to get valid indices. | |
118 | * | |
75b28aff HV |
119 | * The kernel controls head of the sq ring and the tail of the cq ring, |
120 | * and the application controls tail of the sq ring and the head of the | |
121 | * cq ring. | |
1e84b97b | 122 | */ |
75b28aff | 123 | struct io_uring sq, cq; |
1e84b97b | 124 | /* |
75b28aff | 125 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
126 | * ring_entries - 1) |
127 | */ | |
75b28aff HV |
128 | u32 sq_ring_mask, cq_ring_mask; |
129 | /* Ring sizes (constant, power of 2) */ | |
130 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
131 | /* |
132 | * Number of invalid entries dropped by the kernel due to | |
133 | * invalid index stored in array | |
134 | * | |
135 | * Written by the kernel, shouldn't be modified by the | |
136 | * application (i.e. get number of "new events" by comparing to | |
137 | * cached value). | |
138 | * | |
139 | * After a new SQ head value was read by the application this | |
140 | * counter includes all submissions that were dropped reaching | |
141 | * the new SQ head (and possibly more). | |
142 | */ | |
75b28aff | 143 | u32 sq_dropped; |
1e84b97b | 144 | /* |
0d9b5b3a | 145 | * Runtime SQ flags |
1e84b97b SB |
146 | * |
147 | * Written by the kernel, shouldn't be modified by the | |
148 | * application. | |
149 | * | |
150 | * The application needs a full memory barrier before checking | |
151 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
152 | */ | |
75b28aff | 153 | u32 sq_flags; |
0d9b5b3a SG |
154 | /* |
155 | * Runtime CQ flags | |
156 | * | |
157 | * Written by the application, shouldn't be modified by the | |
158 | * kernel. | |
159 | */ | |
160 | u32 cq_flags; | |
1e84b97b SB |
161 | /* |
162 | * Number of completion events lost because the queue was full; | |
163 | * this should be avoided by the application by making sure | |
0b4295b5 | 164 | * there are not more requests pending than there is space in |
1e84b97b SB |
165 | * the completion queue. |
166 | * | |
167 | * Written by the kernel, shouldn't be modified by the | |
168 | * application (i.e. get number of "new events" by comparing to | |
169 | * cached value). | |
170 | * | |
171 | * As completion events come in out of order this counter is not | |
172 | * ordered with any other data. | |
173 | */ | |
75b28aff | 174 | u32 cq_overflow; |
1e84b97b SB |
175 | /* |
176 | * Ring buffer of completion events. | |
177 | * | |
178 | * The kernel writes completion events fresh every time they are | |
179 | * produced, so the application is allowed to modify pending | |
180 | * entries. | |
181 | */ | |
75b28aff | 182 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
183 | }; |
184 | ||
edafccee JA |
185 | struct io_mapped_ubuf { |
186 | u64 ubuf; | |
187 | size_t len; | |
188 | struct bio_vec *bvec; | |
189 | unsigned int nr_bvecs; | |
190 | }; | |
191 | ||
65e19f54 JA |
192 | struct fixed_file_table { |
193 | struct file **files; | |
31b51510 JA |
194 | }; |
195 | ||
05589553 XW |
196 | struct fixed_file_ref_node { |
197 | struct percpu_ref refs; | |
198 | struct list_head node; | |
199 | struct list_head file_list; | |
200 | struct fixed_file_data *file_data; | |
4a38aed2 | 201 | struct llist_node llist; |
05589553 XW |
202 | }; |
203 | ||
05f3fb3c JA |
204 | struct fixed_file_data { |
205 | struct fixed_file_table *table; | |
206 | struct io_ring_ctx *ctx; | |
207 | ||
05589553 | 208 | struct percpu_ref *cur_refs; |
05f3fb3c | 209 | struct percpu_ref refs; |
05f3fb3c | 210 | struct completion done; |
05589553 XW |
211 | struct list_head ref_list; |
212 | spinlock_t lock; | |
05f3fb3c JA |
213 | }; |
214 | ||
5a2e745d JA |
215 | struct io_buffer { |
216 | struct list_head list; | |
217 | __u64 addr; | |
218 | __s32 len; | |
219 | __u16 bid; | |
220 | }; | |
221 | ||
2b188cc1 JA |
222 | struct io_ring_ctx { |
223 | struct { | |
224 | struct percpu_ref refs; | |
225 | } ____cacheline_aligned_in_smp; | |
226 | ||
227 | struct { | |
228 | unsigned int flags; | |
e1d85334 RD |
229 | unsigned int compat: 1; |
230 | unsigned int account_mem: 1; | |
231 | unsigned int cq_overflow_flushed: 1; | |
232 | unsigned int drain_next: 1; | |
233 | unsigned int eventfd_async: 1; | |
2b188cc1 | 234 | |
75b28aff HV |
235 | /* |
236 | * Ring buffer of indices into array of io_uring_sqe, which is | |
237 | * mmapped by the application using the IORING_OFF_SQES offset. | |
238 | * | |
239 | * This indirection could e.g. be used to assign fixed | |
240 | * io_uring_sqe entries to operations and only submit them to | |
241 | * the queue when needed. | |
242 | * | |
243 | * The kernel modifies neither the indices array nor the entries | |
244 | * array. | |
245 | */ | |
246 | u32 *sq_array; | |
2b188cc1 JA |
247 | unsigned cached_sq_head; |
248 | unsigned sq_entries; | |
249 | unsigned sq_mask; | |
6c271ce2 | 250 | unsigned sq_thread_idle; |
498ccd9e | 251 | unsigned cached_sq_dropped; |
206aefde | 252 | atomic_t cached_cq_overflow; |
ad3eb2c8 | 253 | unsigned long sq_check_overflow; |
de0617e4 JA |
254 | |
255 | struct list_head defer_list; | |
5262f567 | 256 | struct list_head timeout_list; |
1d7bb1d5 | 257 | struct list_head cq_overflow_list; |
fcb323cc JA |
258 | |
259 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 260 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
261 | } ____cacheline_aligned_in_smp; |
262 | ||
206aefde JA |
263 | struct io_rings *rings; |
264 | ||
2b188cc1 | 265 | /* IO offload */ |
561fb04a | 266 | struct io_wq *io_wq; |
6c271ce2 | 267 | struct task_struct *sqo_thread; /* if using sq thread polling */ |
2b188cc1 | 268 | struct mm_struct *sqo_mm; |
6c271ce2 | 269 | wait_queue_head_t sqo_wait; |
75b28aff | 270 | |
6b06314c JA |
271 | /* |
272 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
273 | * readers must ensure that ->refs is alive as long as the file* is | |
274 | * used. Only updated through io_uring_register(2). | |
275 | */ | |
05f3fb3c | 276 | struct fixed_file_data *file_data; |
6b06314c | 277 | unsigned nr_user_files; |
b14cca0c PB |
278 | int ring_fd; |
279 | struct file *ring_file; | |
6b06314c | 280 | |
edafccee JA |
281 | /* if used, fixed mapped user buffers */ |
282 | unsigned nr_user_bufs; | |
283 | struct io_mapped_ubuf *user_bufs; | |
284 | ||
2b188cc1 JA |
285 | struct user_struct *user; |
286 | ||
0b8c0ec7 | 287 | const struct cred *creds; |
181e448d | 288 | |
0f158b4c JA |
289 | struct completion ref_comp; |
290 | struct completion sq_thread_comp; | |
206aefde | 291 | |
0ddf92e8 JA |
292 | /* if all else fails... */ |
293 | struct io_kiocb *fallback_req; | |
294 | ||
206aefde JA |
295 | #if defined(CONFIG_UNIX) |
296 | struct socket *ring_sock; | |
297 | #endif | |
298 | ||
5a2e745d JA |
299 | struct idr io_buffer_idr; |
300 | ||
071698e1 JA |
301 | struct idr personality_idr; |
302 | ||
206aefde JA |
303 | struct { |
304 | unsigned cached_cq_tail; | |
305 | unsigned cq_entries; | |
306 | unsigned cq_mask; | |
307 | atomic_t cq_timeouts; | |
ad3eb2c8 | 308 | unsigned long cq_check_overflow; |
206aefde JA |
309 | struct wait_queue_head cq_wait; |
310 | struct fasync_struct *cq_fasync; | |
311 | struct eventfd_ctx *cq_ev_fd; | |
312 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
313 | |
314 | struct { | |
315 | struct mutex uring_lock; | |
316 | wait_queue_head_t wait; | |
317 | } ____cacheline_aligned_in_smp; | |
318 | ||
319 | struct { | |
320 | spinlock_t completion_lock; | |
e94f141b | 321 | |
def596e9 JA |
322 | /* |
323 | * ->poll_list is protected by the ctx->uring_lock for | |
324 | * io_uring instances that don't use IORING_SETUP_SQPOLL. | |
325 | * For SQPOLL, only the single threaded io_sq_thread() will | |
326 | * manipulate the list, hence no extra locking is needed there. | |
327 | */ | |
328 | struct list_head poll_list; | |
78076bb6 JA |
329 | struct hlist_head *cancel_hash; |
330 | unsigned cancel_hash_bits; | |
e94f141b | 331 | bool poll_multi_file; |
31b51510 | 332 | |
fcb323cc JA |
333 | spinlock_t inflight_lock; |
334 | struct list_head inflight_list; | |
2b188cc1 | 335 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 336 | |
4a38aed2 JA |
337 | struct delayed_work file_put_work; |
338 | struct llist_head file_put_llist; | |
339 | ||
85faa7b8 | 340 | struct work_struct exit_work; |
2b188cc1 JA |
341 | }; |
342 | ||
09bb8394 JA |
343 | /* |
344 | * First field must be the file pointer in all the | |
345 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
346 | */ | |
221c5eb2 JA |
347 | struct io_poll_iocb { |
348 | struct file *file; | |
0969e783 JA |
349 | union { |
350 | struct wait_queue_head *head; | |
351 | u64 addr; | |
352 | }; | |
221c5eb2 | 353 | __poll_t events; |
8c838788 | 354 | bool done; |
221c5eb2 | 355 | bool canceled; |
392edb45 | 356 | struct wait_queue_entry wait; |
221c5eb2 JA |
357 | }; |
358 | ||
b5dba59e JA |
359 | struct io_close { |
360 | struct file *file; | |
361 | struct file *put_file; | |
362 | int fd; | |
363 | }; | |
364 | ||
ad8a48ac JA |
365 | struct io_timeout_data { |
366 | struct io_kiocb *req; | |
367 | struct hrtimer timer; | |
368 | struct timespec64 ts; | |
369 | enum hrtimer_mode mode; | |
370 | }; | |
371 | ||
8ed8d3c3 JA |
372 | struct io_accept { |
373 | struct file *file; | |
374 | struct sockaddr __user *addr; | |
375 | int __user *addr_len; | |
376 | int flags; | |
09952e3e | 377 | unsigned long nofile; |
8ed8d3c3 JA |
378 | }; |
379 | ||
380 | struct io_sync { | |
381 | struct file *file; | |
382 | loff_t len; | |
383 | loff_t off; | |
384 | int flags; | |
d63d1b5e | 385 | int mode; |
8ed8d3c3 JA |
386 | }; |
387 | ||
fbf23849 JA |
388 | struct io_cancel { |
389 | struct file *file; | |
390 | u64 addr; | |
391 | }; | |
392 | ||
b29472ee JA |
393 | struct io_timeout { |
394 | struct file *file; | |
395 | u64 addr; | |
396 | int flags; | |
b55ce732 | 397 | u32 count; |
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, | |
531 | REQ_F_IOPOLL_COMPLETED_BIT, | |
532 | REQ_F_LINK_TIMEOUT_BIT, | |
533 | REQ_F_TIMEOUT_BIT, | |
534 | REQ_F_ISREG_BIT, | |
535 | REQ_F_MUST_PUNT_BIT, | |
536 | REQ_F_TIMEOUT_NOSEQ_BIT, | |
537 | REQ_F_COMP_LOCKED_BIT, | |
99bc4c38 | 538 | REQ_F_NEED_CLEANUP_BIT, |
2ca10259 | 539 | REQ_F_OVERFLOW_BIT, |
d7718a9d | 540 | REQ_F_POLLED_BIT, |
bcda7baa | 541 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 542 | REQ_F_NO_FILE_TABLE_BIT, |
84557871 JA |
543 | |
544 | /* not a real bit, just to check we're not overflowing the space */ | |
545 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
546 | }; |
547 | ||
548 | enum { | |
549 | /* ctx owns file */ | |
550 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
551 | /* drain existing IO first */ | |
552 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
553 | /* linked sqes */ | |
554 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
555 | /* doesn't sever on completion < 0 */ | |
556 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
557 | /* IOSQE_ASYNC */ | |
558 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
559 | /* IOSQE_BUFFER_SELECT */ |
560 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 561 | |
dea3b49c PB |
562 | /* head of a link */ |
563 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
564 | /* already grabbed next link */ |
565 | REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT), | |
566 | /* fail rest of links */ | |
567 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
568 | /* on inflight list */ | |
569 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
570 | /* read/write uses file position */ | |
571 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
572 | /* must not punt to workers */ | |
573 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
574 | /* polled IO has completed */ | |
575 | REQ_F_IOPOLL_COMPLETED = BIT(REQ_F_IOPOLL_COMPLETED_BIT), | |
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), | |
d7718a9d JA |
598 | }; |
599 | ||
600 | struct async_poll { | |
601 | struct io_poll_iocb poll; | |
602 | struct io_wq_work work; | |
6b47ee6e PB |
603 | }; |
604 | ||
09bb8394 JA |
605 | /* |
606 | * NOTE! Each of the iocb union members has the file pointer | |
607 | * as the first entry in their struct definition. So you can | |
608 | * access the file pointer through any of the sub-structs, | |
609 | * or directly as just 'ki_filp' in this struct. | |
610 | */ | |
2b188cc1 | 611 | struct io_kiocb { |
221c5eb2 | 612 | union { |
09bb8394 | 613 | struct file *file; |
9adbd45d | 614 | struct io_rw rw; |
221c5eb2 | 615 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
616 | struct io_accept accept; |
617 | struct io_sync sync; | |
fbf23849 | 618 | struct io_cancel cancel; |
b29472ee | 619 | struct io_timeout timeout; |
3fbb51c1 | 620 | struct io_connect connect; |
e47293fd | 621 | struct io_sr_msg sr_msg; |
15b71abe | 622 | struct io_open open; |
b5dba59e | 623 | struct io_close close; |
05f3fb3c | 624 | struct io_files_update files_update; |
4840e418 | 625 | struct io_fadvise fadvise; |
c1ca757b | 626 | struct io_madvise madvise; |
3e4827b0 | 627 | struct io_epoll epoll; |
7d67af2c | 628 | struct io_splice splice; |
ddf0322d | 629 | struct io_provide_buf pbuf; |
1d9e1288 | 630 | struct io_statx statx; |
221c5eb2 | 631 | }; |
2b188cc1 | 632 | |
1a6b74fc | 633 | struct io_async_ctx *io; |
c398ecb3 | 634 | int cflags; |
d625c6ee | 635 | u8 opcode; |
2b188cc1 JA |
636 | |
637 | struct io_ring_ctx *ctx; | |
d7718a9d | 638 | struct list_head list; |
2b188cc1 | 639 | unsigned int flags; |
c16361c1 | 640 | refcount_t refs; |
3537b6a7 JA |
641 | struct task_struct *task; |
642 | unsigned long fsize; | |
2b188cc1 | 643 | u64 user_data; |
9e645e11 | 644 | u32 result; |
de0617e4 | 645 | u32 sequence; |
2b188cc1 | 646 | |
d7718a9d JA |
647 | struct list_head link_list; |
648 | ||
fcb323cc JA |
649 | struct list_head inflight_entry; |
650 | ||
05589553 XW |
651 | struct percpu_ref *fixed_file_refs; |
652 | ||
b41e9852 JA |
653 | union { |
654 | /* | |
655 | * Only commands that never go async can use the below fields, | |
d7718a9d JA |
656 | * obviously. Right now only IORING_OP_POLL_ADD uses them, and |
657 | * async armed poll handlers for regular commands. The latter | |
658 | * restore the work, if needed. | |
b41e9852 JA |
659 | */ |
660 | struct { | |
b41e9852 | 661 | struct callback_head task_work; |
d7718a9d JA |
662 | struct hlist_node hash_node; |
663 | struct async_poll *apoll; | |
b41e9852 JA |
664 | }; |
665 | struct io_wq_work work; | |
666 | }; | |
2b188cc1 JA |
667 | }; |
668 | ||
669 | #define IO_PLUG_THRESHOLD 2 | |
def596e9 | 670 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 671 | |
9a56a232 JA |
672 | struct io_submit_state { |
673 | struct blk_plug plug; | |
674 | ||
2579f913 JA |
675 | /* |
676 | * io_kiocb alloc cache | |
677 | */ | |
678 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 679 | unsigned int free_reqs; |
2579f913 | 680 | |
9a56a232 JA |
681 | /* |
682 | * File reference cache | |
683 | */ | |
684 | struct file *file; | |
685 | unsigned int fd; | |
686 | unsigned int has_refs; | |
687 | unsigned int used_refs; | |
688 | unsigned int ios_left; | |
689 | }; | |
690 | ||
d3656344 JA |
691 | struct io_op_def { |
692 | /* needs req->io allocated for deferral/async */ | |
693 | unsigned async_ctx : 1; | |
694 | /* needs current->mm setup, does mm access */ | |
695 | unsigned needs_mm : 1; | |
696 | /* needs req->file assigned */ | |
697 | unsigned needs_file : 1; | |
d3656344 JA |
698 | /* hash wq insertion if file is a regular file */ |
699 | unsigned hash_reg_file : 1; | |
700 | /* unbound wq insertion if file is a non-regular file */ | |
701 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
702 | /* opcode is not supported by this kernel */ |
703 | unsigned not_supported : 1; | |
f86cd20c JA |
704 | /* needs file table */ |
705 | unsigned file_table : 1; | |
ff002b30 JA |
706 | /* needs ->fs */ |
707 | unsigned needs_fs : 1; | |
8a72758c JA |
708 | /* set if opcode supports polled "wait" */ |
709 | unsigned pollin : 1; | |
710 | unsigned pollout : 1; | |
bcda7baa JA |
711 | /* op supports buffer selection */ |
712 | unsigned buffer_select : 1; | |
d3656344 JA |
713 | }; |
714 | ||
715 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
716 | [IORING_OP_NOP] = {}, |
717 | [IORING_OP_READV] = { | |
d3656344 JA |
718 | .async_ctx = 1, |
719 | .needs_mm = 1, | |
720 | .needs_file = 1, | |
721 | .unbound_nonreg_file = 1, | |
8a72758c | 722 | .pollin = 1, |
4d954c25 | 723 | .buffer_select = 1, |
d3656344 | 724 | }, |
0463b6c5 | 725 | [IORING_OP_WRITEV] = { |
d3656344 JA |
726 | .async_ctx = 1, |
727 | .needs_mm = 1, | |
728 | .needs_file = 1, | |
729 | .hash_reg_file = 1, | |
730 | .unbound_nonreg_file = 1, | |
8a72758c | 731 | .pollout = 1, |
d3656344 | 732 | }, |
0463b6c5 | 733 | [IORING_OP_FSYNC] = { |
d3656344 JA |
734 | .needs_file = 1, |
735 | }, | |
0463b6c5 | 736 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
737 | .needs_file = 1, |
738 | .unbound_nonreg_file = 1, | |
8a72758c | 739 | .pollin = 1, |
d3656344 | 740 | }, |
0463b6c5 | 741 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
742 | .needs_file = 1, |
743 | .hash_reg_file = 1, | |
744 | .unbound_nonreg_file = 1, | |
8a72758c | 745 | .pollout = 1, |
d3656344 | 746 | }, |
0463b6c5 | 747 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
748 | .needs_file = 1, |
749 | .unbound_nonreg_file = 1, | |
750 | }, | |
0463b6c5 PB |
751 | [IORING_OP_POLL_REMOVE] = {}, |
752 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
753 | .needs_file = 1, |
754 | }, | |
0463b6c5 | 755 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
756 | .async_ctx = 1, |
757 | .needs_mm = 1, | |
758 | .needs_file = 1, | |
759 | .unbound_nonreg_file = 1, | |
ff002b30 | 760 | .needs_fs = 1, |
8a72758c | 761 | .pollout = 1, |
d3656344 | 762 | }, |
0463b6c5 | 763 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
764 | .async_ctx = 1, |
765 | .needs_mm = 1, | |
766 | .needs_file = 1, | |
767 | .unbound_nonreg_file = 1, | |
ff002b30 | 768 | .needs_fs = 1, |
8a72758c | 769 | .pollin = 1, |
52de1fe1 | 770 | .buffer_select = 1, |
d3656344 | 771 | }, |
0463b6c5 | 772 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
773 | .async_ctx = 1, |
774 | .needs_mm = 1, | |
775 | }, | |
0463b6c5 PB |
776 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
777 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
778 | .needs_mm = 1, |
779 | .needs_file = 1, | |
780 | .unbound_nonreg_file = 1, | |
f86cd20c | 781 | .file_table = 1, |
8a72758c | 782 | .pollin = 1, |
d3656344 | 783 | }, |
0463b6c5 PB |
784 | [IORING_OP_ASYNC_CANCEL] = {}, |
785 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
786 | .async_ctx = 1, |
787 | .needs_mm = 1, | |
788 | }, | |
0463b6c5 | 789 | [IORING_OP_CONNECT] = { |
d3656344 JA |
790 | .async_ctx = 1, |
791 | .needs_mm = 1, | |
792 | .needs_file = 1, | |
793 | .unbound_nonreg_file = 1, | |
8a72758c | 794 | .pollout = 1, |
d3656344 | 795 | }, |
0463b6c5 | 796 | [IORING_OP_FALLOCATE] = { |
d3656344 JA |
797 | .needs_file = 1, |
798 | }, | |
0463b6c5 | 799 | [IORING_OP_OPENAT] = { |
f86cd20c | 800 | .file_table = 1, |
ff002b30 | 801 | .needs_fs = 1, |
d3656344 | 802 | }, |
0463b6c5 | 803 | [IORING_OP_CLOSE] = { |
f86cd20c | 804 | .file_table = 1, |
d3656344 | 805 | }, |
0463b6c5 | 806 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 807 | .needs_mm = 1, |
f86cd20c | 808 | .file_table = 1, |
d3656344 | 809 | }, |
0463b6c5 | 810 | [IORING_OP_STATX] = { |
d3656344 | 811 | .needs_mm = 1, |
ff002b30 | 812 | .needs_fs = 1, |
5b0bbee4 | 813 | .file_table = 1, |
d3656344 | 814 | }, |
0463b6c5 | 815 | [IORING_OP_READ] = { |
3a6820f2 JA |
816 | .needs_mm = 1, |
817 | .needs_file = 1, | |
818 | .unbound_nonreg_file = 1, | |
8a72758c | 819 | .pollin = 1, |
bcda7baa | 820 | .buffer_select = 1, |
3a6820f2 | 821 | }, |
0463b6c5 | 822 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
823 | .needs_mm = 1, |
824 | .needs_file = 1, | |
825 | .unbound_nonreg_file = 1, | |
8a72758c | 826 | .pollout = 1, |
3a6820f2 | 827 | }, |
0463b6c5 | 828 | [IORING_OP_FADVISE] = { |
4840e418 JA |
829 | .needs_file = 1, |
830 | }, | |
0463b6c5 | 831 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
832 | .needs_mm = 1, |
833 | }, | |
0463b6c5 | 834 | [IORING_OP_SEND] = { |
fddaface JA |
835 | .needs_mm = 1, |
836 | .needs_file = 1, | |
837 | .unbound_nonreg_file = 1, | |
8a72758c | 838 | .pollout = 1, |
fddaface | 839 | }, |
0463b6c5 | 840 | [IORING_OP_RECV] = { |
fddaface JA |
841 | .needs_mm = 1, |
842 | .needs_file = 1, | |
843 | .unbound_nonreg_file = 1, | |
8a72758c | 844 | .pollin = 1, |
bcda7baa | 845 | .buffer_select = 1, |
fddaface | 846 | }, |
0463b6c5 | 847 | [IORING_OP_OPENAT2] = { |
f86cd20c | 848 | .file_table = 1, |
ff002b30 | 849 | .needs_fs = 1, |
cebdb986 | 850 | }, |
3e4827b0 JA |
851 | [IORING_OP_EPOLL_CTL] = { |
852 | .unbound_nonreg_file = 1, | |
853 | .file_table = 1, | |
854 | }, | |
7d67af2c PB |
855 | [IORING_OP_SPLICE] = { |
856 | .needs_file = 1, | |
857 | .hash_reg_file = 1, | |
858 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
859 | }, |
860 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 861 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
862 | [IORING_OP_TEE] = { |
863 | .needs_file = 1, | |
864 | .hash_reg_file = 1, | |
865 | .unbound_nonreg_file = 1, | |
866 | }, | |
d3656344 JA |
867 | }; |
868 | ||
561fb04a | 869 | static void io_wq_submit_work(struct io_wq_work **workptr); |
78e19bbe | 870 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 871 | static void io_put_req(struct io_kiocb *req); |
978db57e | 872 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 JA |
873 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
874 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c JA |
875 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
876 | struct io_uring_files_update *ip, | |
877 | unsigned nr_args); | |
f86cd20c | 878 | static int io_grab_files(struct io_kiocb *req); |
99bc4c38 | 879 | static void io_cleanup_req(struct io_kiocb *req); |
b41e9852 JA |
880 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
881 | int fd, struct file **out_file, bool fixed); | |
882 | static void __io_queue_sqe(struct io_kiocb *req, | |
883 | const struct io_uring_sqe *sqe); | |
de0617e4 | 884 | |
2b188cc1 JA |
885 | static struct kmem_cache *req_cachep; |
886 | ||
887 | static const struct file_operations io_uring_fops; | |
888 | ||
889 | struct sock *io_uring_get_socket(struct file *file) | |
890 | { | |
891 | #if defined(CONFIG_UNIX) | |
892 | if (file->f_op == &io_uring_fops) { | |
893 | struct io_ring_ctx *ctx = file->private_data; | |
894 | ||
895 | return ctx->ring_sock->sk; | |
896 | } | |
897 | #endif | |
898 | return NULL; | |
899 | } | |
900 | EXPORT_SYMBOL(io_uring_get_socket); | |
901 | ||
4a38aed2 JA |
902 | static void io_file_put_work(struct work_struct *work); |
903 | ||
0cdaf760 PB |
904 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
905 | { | |
906 | return ctx->flags & IORING_SETUP_SQPOLL; | |
907 | } | |
908 | ||
2b188cc1 JA |
909 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
910 | { | |
911 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
912 | ||
0f158b4c | 913 | complete(&ctx->ref_comp); |
2b188cc1 JA |
914 | } |
915 | ||
916 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) | |
917 | { | |
918 | struct io_ring_ctx *ctx; | |
78076bb6 | 919 | int hash_bits; |
2b188cc1 JA |
920 | |
921 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
922 | if (!ctx) | |
923 | return NULL; | |
924 | ||
0ddf92e8 JA |
925 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
926 | if (!ctx->fallback_req) | |
927 | goto err; | |
928 | ||
78076bb6 JA |
929 | /* |
930 | * Use 5 bits less than the max cq entries, that should give us around | |
931 | * 32 entries per hash list if totally full and uniformly spread. | |
932 | */ | |
933 | hash_bits = ilog2(p->cq_entries); | |
934 | hash_bits -= 5; | |
935 | if (hash_bits <= 0) | |
936 | hash_bits = 1; | |
937 | ctx->cancel_hash_bits = hash_bits; | |
938 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
939 | GFP_KERNEL); | |
940 | if (!ctx->cancel_hash) | |
941 | goto err; | |
942 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
943 | ||
21482896 | 944 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
945 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
946 | goto err; | |
2b188cc1 JA |
947 | |
948 | ctx->flags = p->flags; | |
949 | init_waitqueue_head(&ctx->cq_wait); | |
1d7bb1d5 | 950 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
951 | init_completion(&ctx->ref_comp); |
952 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 953 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 954 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
955 | mutex_init(&ctx->uring_lock); |
956 | init_waitqueue_head(&ctx->wait); | |
957 | spin_lock_init(&ctx->completion_lock); | |
def596e9 | 958 | INIT_LIST_HEAD(&ctx->poll_list); |
de0617e4 | 959 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 960 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
961 | init_waitqueue_head(&ctx->inflight_wait); |
962 | spin_lock_init(&ctx->inflight_lock); | |
963 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
964 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
965 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 966 | return ctx; |
206aefde | 967 | err: |
0ddf92e8 JA |
968 | if (ctx->fallback_req) |
969 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 970 | kfree(ctx->cancel_hash); |
206aefde JA |
971 | kfree(ctx); |
972 | return NULL; | |
2b188cc1 JA |
973 | } |
974 | ||
9d858b21 | 975 | static inline bool __req_need_defer(struct io_kiocb *req) |
7adf4eaf | 976 | { |
a197f664 JL |
977 | struct io_ring_ctx *ctx = req->ctx; |
978 | ||
31af27c7 PB |
979 | return req->sequence != ctx->cached_cq_tail |
980 | + atomic_read(&ctx->cached_cq_overflow); | |
7adf4eaf JA |
981 | } |
982 | ||
9d858b21 | 983 | static inline bool req_need_defer(struct io_kiocb *req) |
de0617e4 | 984 | { |
87987898 | 985 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) |
9d858b21 | 986 | return __req_need_defer(req); |
de0617e4 | 987 | |
9d858b21 | 988 | return false; |
de0617e4 JA |
989 | } |
990 | ||
5262f567 JA |
991 | static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx) |
992 | { | |
7adf4eaf JA |
993 | struct io_kiocb *req; |
994 | ||
995 | req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list); | |
93bd25bb JA |
996 | if (req) { |
997 | if (req->flags & REQ_F_TIMEOUT_NOSEQ) | |
998 | return NULL; | |
fb4b3d3f | 999 | if (!__req_need_defer(req)) { |
93bd25bb JA |
1000 | list_del_init(&req->list); |
1001 | return req; | |
1002 | } | |
7adf4eaf JA |
1003 | } |
1004 | ||
1005 | return NULL; | |
5262f567 JA |
1006 | } |
1007 | ||
de0617e4 | 1008 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1009 | { |
75b28aff | 1010 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1011 | |
07910158 PB |
1012 | /* order cqe stores with ring update */ |
1013 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1014 | |
07910158 PB |
1015 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1016 | wake_up_interruptible(&ctx->cq_wait); | |
1017 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1018 | } |
1019 | } | |
1020 | ||
cccf0ee8 JA |
1021 | static inline void io_req_work_grab_env(struct io_kiocb *req, |
1022 | const struct io_op_def *def) | |
1023 | { | |
1024 | if (!req->work.mm && def->needs_mm) { | |
1025 | mmgrab(current->mm); | |
1026 | req->work.mm = current->mm; | |
2b188cc1 | 1027 | } |
cccf0ee8 JA |
1028 | if (!req->work.creds) |
1029 | req->work.creds = get_current_cred(); | |
ff002b30 JA |
1030 | if (!req->work.fs && def->needs_fs) { |
1031 | spin_lock(¤t->fs->lock); | |
1032 | if (!current->fs->in_exec) { | |
1033 | req->work.fs = current->fs; | |
1034 | req->work.fs->users++; | |
1035 | } else { | |
1036 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1037 | } | |
1038 | spin_unlock(¤t->fs->lock); | |
1039 | } | |
6ab23144 JA |
1040 | if (!req->work.task_pid) |
1041 | req->work.task_pid = task_pid_vnr(current); | |
2b188cc1 JA |
1042 | } |
1043 | ||
cccf0ee8 | 1044 | static inline void io_req_work_drop_env(struct io_kiocb *req) |
18d9be1a | 1045 | { |
cccf0ee8 JA |
1046 | if (req->work.mm) { |
1047 | mmdrop(req->work.mm); | |
1048 | req->work.mm = NULL; | |
1049 | } | |
1050 | if (req->work.creds) { | |
1051 | put_cred(req->work.creds); | |
1052 | req->work.creds = NULL; | |
1053 | } | |
ff002b30 JA |
1054 | if (req->work.fs) { |
1055 | struct fs_struct *fs = req->work.fs; | |
1056 | ||
1057 | spin_lock(&req->work.fs->lock); | |
1058 | if (--fs->users) | |
1059 | fs = NULL; | |
1060 | spin_unlock(&req->work.fs->lock); | |
1061 | if (fs) | |
1062 | free_fs_struct(fs); | |
1063 | } | |
561fb04a JA |
1064 | } |
1065 | ||
8766dd51 | 1066 | static inline void io_prep_async_work(struct io_kiocb *req, |
94ae5e77 | 1067 | struct io_kiocb **link) |
18d9be1a | 1068 | { |
d3656344 | 1069 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1070 | |
d3656344 JA |
1071 | if (req->flags & REQ_F_ISREG) { |
1072 | if (def->hash_reg_file) | |
8766dd51 | 1073 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1074 | } else { |
1075 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1076 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1077 | } |
cccf0ee8 JA |
1078 | |
1079 | io_req_work_grab_env(req, def); | |
54a91f3b | 1080 | |
94ae5e77 | 1081 | *link = io_prep_linked_timeout(req); |
561fb04a JA |
1082 | } |
1083 | ||
a197f664 | 1084 | static inline void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1085 | { |
a197f664 | 1086 | struct io_ring_ctx *ctx = req->ctx; |
94ae5e77 | 1087 | struct io_kiocb *link; |
94ae5e77 | 1088 | |
8766dd51 | 1089 | io_prep_async_work(req, &link); |
561fb04a | 1090 | |
8766dd51 PB |
1091 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1092 | &req->work, req->flags); | |
1093 | io_wq_enqueue(ctx->io_wq, &req->work); | |
94ae5e77 JA |
1094 | |
1095 | if (link) | |
1096 | io_queue_linked_timeout(link); | |
18d9be1a JA |
1097 | } |
1098 | ||
5262f567 JA |
1099 | static void io_kill_timeout(struct io_kiocb *req) |
1100 | { | |
1101 | int ret; | |
1102 | ||
2d28390a | 1103 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 JA |
1104 | if (ret != -1) { |
1105 | atomic_inc(&req->ctx->cq_timeouts); | |
842f9612 | 1106 | list_del_init(&req->list); |
f0e20b89 | 1107 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1108 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1109 | io_put_req(req); |
5262f567 JA |
1110 | } |
1111 | } | |
1112 | ||
1113 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1114 | { | |
1115 | struct io_kiocb *req, *tmp; | |
1116 | ||
1117 | spin_lock_irq(&ctx->completion_lock); | |
1118 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, list) | |
1119 | io_kill_timeout(req); | |
1120 | spin_unlock_irq(&ctx->completion_lock); | |
1121 | } | |
1122 | ||
04518945 PB |
1123 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
1124 | { | |
1125 | do { | |
1126 | struct io_kiocb *req = list_first_entry(&ctx->defer_list, | |
1127 | struct io_kiocb, list); | |
1128 | ||
1129 | if (req_need_defer(req)) | |
1130 | break; | |
1131 | list_del_init(&req->list); | |
1132 | io_queue_async_work(req); | |
1133 | } while (!list_empty(&ctx->defer_list)); | |
1134 | } | |
1135 | ||
de0617e4 JA |
1136 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1137 | { | |
1138 | struct io_kiocb *req; | |
1139 | ||
5262f567 JA |
1140 | while ((req = io_get_timeout_req(ctx)) != NULL) |
1141 | io_kill_timeout(req); | |
1142 | ||
de0617e4 JA |
1143 | __io_commit_cqring(ctx); |
1144 | ||
04518945 PB |
1145 | if (unlikely(!list_empty(&ctx->defer_list))) |
1146 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1147 | } |
1148 | ||
2b188cc1 JA |
1149 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1150 | { | |
75b28aff | 1151 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1152 | unsigned tail; |
1153 | ||
1154 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1155 | /* |
1156 | * writes to the cq entry need to come after reading head; the | |
1157 | * control dependency is enough as we're using WRITE_ONCE to | |
1158 | * fill the cq entry | |
1159 | */ | |
75b28aff | 1160 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1161 | return NULL; |
1162 | ||
1163 | ctx->cached_cq_tail++; | |
75b28aff | 1164 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1165 | } |
1166 | ||
f2842ab5 JA |
1167 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1168 | { | |
f0b493e6 JA |
1169 | if (!ctx->cq_ev_fd) |
1170 | return false; | |
7e55a19c SG |
1171 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1172 | return false; | |
f2842ab5 JA |
1173 | if (!ctx->eventfd_async) |
1174 | return true; | |
b41e9852 | 1175 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1176 | } |
1177 | ||
b41e9852 | 1178 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1179 | { |
1180 | if (waitqueue_active(&ctx->wait)) | |
1181 | wake_up(&ctx->wait); | |
1182 | if (waitqueue_active(&ctx->sqo_wait)) | |
1183 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1184 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1185 | eventfd_signal(ctx->cq_ev_fd, 1); |
1186 | } | |
1187 | ||
c4a2ed72 JA |
1188 | /* Returns true if there are no backlogged entries after the flush */ |
1189 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1190 | { |
1191 | struct io_rings *rings = ctx->rings; | |
1192 | struct io_uring_cqe *cqe; | |
1193 | struct io_kiocb *req; | |
1194 | unsigned long flags; | |
1195 | LIST_HEAD(list); | |
1196 | ||
1197 | if (!force) { | |
1198 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1199 | return true; |
1d7bb1d5 JA |
1200 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1201 | rings->cq_ring_entries)) | |
c4a2ed72 | 1202 | return false; |
1d7bb1d5 JA |
1203 | } |
1204 | ||
1205 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1206 | ||
1207 | /* if force is set, the ring is going away. always drop after that */ | |
1208 | if (force) | |
69b3e546 | 1209 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1210 | |
c4a2ed72 | 1211 | cqe = NULL; |
1d7bb1d5 JA |
1212 | while (!list_empty(&ctx->cq_overflow_list)) { |
1213 | cqe = io_get_cqring(ctx); | |
1214 | if (!cqe && !force) | |
1215 | break; | |
1216 | ||
1217 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
1218 | list); | |
1219 | list_move(&req->list, &list); | |
2ca10259 | 1220 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1221 | if (cqe) { |
1222 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1223 | WRITE_ONCE(cqe->res, req->result); | |
bcda7baa | 1224 | WRITE_ONCE(cqe->flags, req->cflags); |
1d7bb1d5 JA |
1225 | } else { |
1226 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1227 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | io_commit_cqring(ctx); | |
ad3eb2c8 JA |
1232 | if (cqe) { |
1233 | clear_bit(0, &ctx->sq_check_overflow); | |
1234 | clear_bit(0, &ctx->cq_check_overflow); | |
1235 | } | |
1d7bb1d5 JA |
1236 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1237 | io_cqring_ev_posted(ctx); | |
1238 | ||
1239 | while (!list_empty(&list)) { | |
1240 | req = list_first_entry(&list, struct io_kiocb, list); | |
1241 | list_del(&req->list); | |
ec9c02ad | 1242 | io_put_req(req); |
1d7bb1d5 | 1243 | } |
c4a2ed72 JA |
1244 | |
1245 | return cqe != NULL; | |
1d7bb1d5 JA |
1246 | } |
1247 | ||
bcda7baa | 1248 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1249 | { |
78e19bbe | 1250 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1251 | struct io_uring_cqe *cqe; |
1252 | ||
78e19bbe | 1253 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1254 | |
2b188cc1 JA |
1255 | /* |
1256 | * If we can't get a cq entry, userspace overflowed the | |
1257 | * submission (by quite a lot). Increment the overflow count in | |
1258 | * the ring. | |
1259 | */ | |
1260 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1261 | if (likely(cqe)) { |
78e19bbe | 1262 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1263 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1264 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1265 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1266 | WRITE_ONCE(ctx->rings->cq_overflow, |
1267 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1268 | } else { |
ad3eb2c8 JA |
1269 | if (list_empty(&ctx->cq_overflow_list)) { |
1270 | set_bit(0, &ctx->sq_check_overflow); | |
1271 | set_bit(0, &ctx->cq_check_overflow); | |
1272 | } | |
2ca10259 | 1273 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1274 | refcount_inc(&req->refs); |
1275 | req->result = res; | |
bcda7baa | 1276 | req->cflags = cflags; |
1d7bb1d5 | 1277 | list_add_tail(&req->list, &ctx->cq_overflow_list); |
2b188cc1 JA |
1278 | } |
1279 | } | |
1280 | ||
bcda7baa JA |
1281 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1282 | { | |
1283 | __io_cqring_fill_event(req, res, 0); | |
1284 | } | |
1285 | ||
1286 | static void __io_cqring_add_event(struct io_kiocb *req, long res, long cflags) | |
2b188cc1 | 1287 | { |
78e19bbe | 1288 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1289 | unsigned long flags; |
1290 | ||
1291 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1292 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1293 | io_commit_cqring(ctx); |
1294 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1295 | ||
8c838788 | 1296 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1297 | } |
1298 | ||
bcda7baa JA |
1299 | static void io_cqring_add_event(struct io_kiocb *req, long res) |
1300 | { | |
1301 | __io_cqring_add_event(req, res, 0); | |
1302 | } | |
1303 | ||
0ddf92e8 JA |
1304 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1305 | { | |
1306 | return req == (struct io_kiocb *) | |
1307 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1308 | } | |
1309 | ||
1310 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1311 | { | |
1312 | struct io_kiocb *req; | |
1313 | ||
1314 | req = ctx->fallback_req; | |
dd461af6 | 1315 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1316 | return req; |
1317 | ||
1318 | return NULL; | |
1319 | } | |
1320 | ||
0553b8bd PB |
1321 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1322 | struct io_submit_state *state) | |
2b188cc1 | 1323 | { |
fd6fab2c | 1324 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1325 | struct io_kiocb *req; |
1326 | ||
2579f913 | 1327 | if (!state) { |
fd6fab2c | 1328 | req = kmem_cache_alloc(req_cachep, gfp); |
2579f913 | 1329 | if (unlikely(!req)) |
0ddf92e8 | 1330 | goto fallback; |
2579f913 JA |
1331 | } else if (!state->free_reqs) { |
1332 | size_t sz; | |
1333 | int ret; | |
1334 | ||
1335 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1336 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1337 | ||
1338 | /* | |
1339 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1340 | * retry single alloc to be on the safe side. | |
1341 | */ | |
1342 | if (unlikely(ret <= 0)) { | |
1343 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1344 | if (!state->reqs[0]) | |
0ddf92e8 | 1345 | goto fallback; |
fd6fab2c JA |
1346 | ret = 1; |
1347 | } | |
2579f913 | 1348 | state->free_reqs = ret - 1; |
6c8a3134 | 1349 | req = state->reqs[ret - 1]; |
2579f913 | 1350 | } else { |
2579f913 | 1351 | state->free_reqs--; |
6c8a3134 | 1352 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1353 | } |
1354 | ||
2579f913 | 1355 | return req; |
0ddf92e8 | 1356 | fallback: |
0553b8bd | 1357 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1358 | } |
1359 | ||
8da11c19 PB |
1360 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1361 | bool fixed) | |
1362 | { | |
1363 | if (fixed) | |
05589553 | 1364 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1365 | else |
1366 | fput(file); | |
1367 | } | |
1368 | ||
c6ca97b3 | 1369 | static void __io_req_aux_free(struct io_kiocb *req) |
2b188cc1 | 1370 | { |
929a3af9 PB |
1371 | if (req->flags & REQ_F_NEED_CLEANUP) |
1372 | io_cleanup_req(req); | |
1373 | ||
96fd84d8 | 1374 | kfree(req->io); |
8da11c19 PB |
1375 | if (req->file) |
1376 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
3537b6a7 JA |
1377 | if (req->task) |
1378 | put_task_struct(req->task); | |
cccf0ee8 JA |
1379 | |
1380 | io_req_work_drop_env(req); | |
def596e9 JA |
1381 | } |
1382 | ||
9e645e11 | 1383 | static void __io_free_req(struct io_kiocb *req) |
2b188cc1 | 1384 | { |
c6ca97b3 | 1385 | __io_req_aux_free(req); |
fcb323cc | 1386 | |
fcb323cc | 1387 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1388 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1389 | unsigned long flags; |
1390 | ||
1391 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1392 | list_del(&req->inflight_entry); | |
1393 | if (waitqueue_active(&ctx->inflight_wait)) | |
1394 | wake_up(&ctx->inflight_wait); | |
1395 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1396 | } | |
2b85edfc PB |
1397 | |
1398 | percpu_ref_put(&req->ctx->refs); | |
b1e50e54 PB |
1399 | if (likely(!io_is_fallback_req(req))) |
1400 | kmem_cache_free(req_cachep, req); | |
1401 | else | |
dd461af6 | 1402 | clear_bit_unlock(0, (unsigned long *) &req->ctx->fallback_req); |
e65ef56d JA |
1403 | } |
1404 | ||
c6ca97b3 JA |
1405 | struct req_batch { |
1406 | void *reqs[IO_IOPOLL_BATCH]; | |
1407 | int to_free; | |
1408 | int need_iter; | |
1409 | }; | |
1410 | ||
1411 | static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb) | |
1412 | { | |
1413 | if (!rb->to_free) | |
1414 | return; | |
1415 | if (rb->need_iter) { | |
1416 | int i, inflight = 0; | |
1417 | unsigned long flags; | |
1418 | ||
1419 | for (i = 0; i < rb->to_free; i++) { | |
1420 | struct io_kiocb *req = rb->reqs[i]; | |
1421 | ||
10fef4be | 1422 | if (req->flags & REQ_F_FIXED_FILE) { |
c6ca97b3 | 1423 | req->file = NULL; |
05589553 | 1424 | percpu_ref_put(req->fixed_file_refs); |
10fef4be | 1425 | } |
c6ca97b3 JA |
1426 | if (req->flags & REQ_F_INFLIGHT) |
1427 | inflight++; | |
c6ca97b3 JA |
1428 | __io_req_aux_free(req); |
1429 | } | |
1430 | if (!inflight) | |
1431 | goto do_free; | |
1432 | ||
1433 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1434 | for (i = 0; i < rb->to_free; i++) { | |
1435 | struct io_kiocb *req = rb->reqs[i]; | |
1436 | ||
10fef4be | 1437 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 JA |
1438 | list_del(&req->inflight_entry); |
1439 | if (!--inflight) | |
1440 | break; | |
1441 | } | |
1442 | } | |
1443 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1444 | ||
1445 | if (waitqueue_active(&ctx->inflight_wait)) | |
1446 | wake_up(&ctx->inflight_wait); | |
1447 | } | |
1448 | do_free: | |
1449 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1450 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
c6ca97b3 | 1451 | rb->to_free = rb->need_iter = 0; |
e65ef56d JA |
1452 | } |
1453 | ||
a197f664 | 1454 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1455 | { |
a197f664 | 1456 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1457 | int ret; |
1458 | ||
2d28390a | 1459 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1460 | if (ret != -1) { |
78e19bbe | 1461 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1462 | io_commit_cqring(ctx); |
dea3b49c | 1463 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1464 | io_put_req(req); |
2665abfd JA |
1465 | return true; |
1466 | } | |
1467 | ||
1468 | return false; | |
e65ef56d JA |
1469 | } |
1470 | ||
ba816ad6 | 1471 | static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
9e645e11 | 1472 | { |
2665abfd | 1473 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1474 | bool wake_ev = false; |
9e645e11 | 1475 | |
4d7dd462 JA |
1476 | /* Already got next link */ |
1477 | if (req->flags & REQ_F_LINK_NEXT) | |
1478 | return; | |
1479 | ||
9e645e11 JA |
1480 | /* |
1481 | * The list should never be empty when we are called here. But could | |
1482 | * potentially happen if the chain is messed up, check to be on the | |
1483 | * safe side. | |
1484 | */ | |
4493233e PB |
1485 | while (!list_empty(&req->link_list)) { |
1486 | struct io_kiocb *nxt = list_first_entry(&req->link_list, | |
1487 | struct io_kiocb, link_list); | |
94ae5e77 | 1488 | |
4493233e PB |
1489 | if (unlikely((req->flags & REQ_F_LINK_TIMEOUT) && |
1490 | (nxt->flags & REQ_F_TIMEOUT))) { | |
1491 | list_del_init(&nxt->link_list); | |
94ae5e77 | 1492 | wake_ev |= io_link_cancel_timeout(nxt); |
94ae5e77 JA |
1493 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
1494 | continue; | |
1495 | } | |
9e645e11 | 1496 | |
4493233e PB |
1497 | list_del_init(&req->link_list); |
1498 | if (!list_empty(&nxt->link_list)) | |
dea3b49c | 1499 | nxt->flags |= REQ_F_LINK_HEAD; |
b18fdf71 | 1500 | *nxtptr = nxt; |
94ae5e77 | 1501 | break; |
9e645e11 | 1502 | } |
2665abfd | 1503 | |
4d7dd462 | 1504 | req->flags |= REQ_F_LINK_NEXT; |
2665abfd JA |
1505 | if (wake_ev) |
1506 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1507 | } |
1508 | ||
1509 | /* | |
dea3b49c | 1510 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 JA |
1511 | */ |
1512 | static void io_fail_links(struct io_kiocb *req) | |
1513 | { | |
2665abfd | 1514 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1515 | unsigned long flags; |
1516 | ||
1517 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
9e645e11 JA |
1518 | |
1519 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1520 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1521 | struct io_kiocb, link_list); | |
9e645e11 | 1522 | |
4493233e | 1523 | list_del_init(&link->link_list); |
c826bd7a | 1524 | trace_io_uring_fail_link(req, link); |
2665abfd JA |
1525 | |
1526 | if ((req->flags & REQ_F_LINK_TIMEOUT) && | |
d625c6ee | 1527 | link->opcode == IORING_OP_LINK_TIMEOUT) { |
a197f664 | 1528 | io_link_cancel_timeout(link); |
2665abfd | 1529 | } else { |
78e19bbe | 1530 | io_cqring_fill_event(link, -ECANCELED); |
978db57e | 1531 | __io_double_put_req(link); |
2665abfd | 1532 | } |
5d960724 | 1533 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1534 | } |
2665abfd JA |
1535 | |
1536 | io_commit_cqring(ctx); | |
1537 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1538 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1539 | } |
1540 | ||
4d7dd462 | 1541 | static void io_req_find_next(struct io_kiocb *req, struct io_kiocb **nxt) |
9e645e11 | 1542 | { |
dea3b49c | 1543 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) |
2665abfd | 1544 | return; |
2665abfd | 1545 | |
9e645e11 JA |
1546 | /* |
1547 | * If LINK is set, we have dependent requests in this chain. If we | |
1548 | * didn't fail this request, queue the first one up, moving any other | |
1549 | * dependencies to the next request. In case of failure, fail the rest | |
1550 | * of the chain. | |
1551 | */ | |
2665abfd JA |
1552 | if (req->flags & REQ_F_FAIL_LINK) { |
1553 | io_fail_links(req); | |
7c9e7f0f JA |
1554 | } else if ((req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_COMP_LOCKED)) == |
1555 | REQ_F_LINK_TIMEOUT) { | |
2665abfd JA |
1556 | struct io_ring_ctx *ctx = req->ctx; |
1557 | unsigned long flags; | |
1558 | ||
1559 | /* | |
1560 | * If this is a timeout link, we could be racing with the | |
1561 | * timeout timer. Grab the completion lock for this case to | |
7c9e7f0f | 1562 | * protect against that. |
2665abfd JA |
1563 | */ |
1564 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1565 | io_req_link_next(req, nxt); | |
1566 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1567 | } else { | |
1568 | io_req_link_next(req, nxt); | |
9e645e11 | 1569 | } |
4d7dd462 | 1570 | } |
9e645e11 | 1571 | |
c69f8dbe JL |
1572 | static void io_free_req(struct io_kiocb *req) |
1573 | { | |
944e58bf PB |
1574 | struct io_kiocb *nxt = NULL; |
1575 | ||
1576 | io_req_find_next(req, &nxt); | |
70cf9f32 | 1577 | __io_free_req(req); |
944e58bf PB |
1578 | |
1579 | if (nxt) | |
1580 | io_queue_async_work(nxt); | |
c69f8dbe JL |
1581 | } |
1582 | ||
7a743e22 PB |
1583 | static void io_link_work_cb(struct io_wq_work **workptr) |
1584 | { | |
18a542ff PB |
1585 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); |
1586 | struct io_kiocb *link; | |
7a743e22 | 1587 | |
18a542ff | 1588 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
7a743e22 PB |
1589 | io_queue_linked_timeout(link); |
1590 | io_wq_submit_work(workptr); | |
1591 | } | |
1592 | ||
1593 | static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) | |
1594 | { | |
1595 | struct io_kiocb *link; | |
8766dd51 PB |
1596 | const struct io_op_def *def = &io_op_defs[nxt->opcode]; |
1597 | ||
1598 | if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file) | |
1599 | io_wq_hash_work(&nxt->work, file_inode(nxt->file)); | |
7a743e22 PB |
1600 | |
1601 | *workptr = &nxt->work; | |
1602 | link = io_prep_linked_timeout(nxt); | |
18a542ff | 1603 | if (link) |
7a743e22 | 1604 | nxt->work.func = io_link_work_cb; |
7a743e22 PB |
1605 | } |
1606 | ||
ba816ad6 JA |
1607 | /* |
1608 | * Drop reference to request, return next in chain (if there is one) if this | |
1609 | * was the last reference to this request. | |
1610 | */ | |
f9bd67f6 | 1611 | __attribute__((nonnull)) |
ec9c02ad | 1612 | static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
e65ef56d | 1613 | { |
2a44f467 JA |
1614 | if (refcount_dec_and_test(&req->refs)) { |
1615 | io_req_find_next(req, nxtptr); | |
4d7dd462 | 1616 | __io_free_req(req); |
2a44f467 | 1617 | } |
2b188cc1 JA |
1618 | } |
1619 | ||
e65ef56d JA |
1620 | static void io_put_req(struct io_kiocb *req) |
1621 | { | |
1622 | if (refcount_dec_and_test(&req->refs)) | |
1623 | io_free_req(req); | |
2b188cc1 JA |
1624 | } |
1625 | ||
e9fd9396 PB |
1626 | static void io_steal_work(struct io_kiocb *req, |
1627 | struct io_wq_work **workptr) | |
7a743e22 PB |
1628 | { |
1629 | /* | |
1630 | * It's in an io-wq worker, so there always should be at least | |
1631 | * one reference, which will be dropped in io_put_work() just | |
1632 | * after the current handler returns. | |
1633 | * | |
1634 | * It also means, that if the counter dropped to 1, then there is | |
1635 | * no asynchronous users left, so it's safe to steal the next work. | |
1636 | */ | |
7a743e22 PB |
1637 | if (refcount_read(&req->refs) == 1) { |
1638 | struct io_kiocb *nxt = NULL; | |
1639 | ||
1640 | io_req_find_next(req, &nxt); | |
1641 | if (nxt) | |
1642 | io_wq_assign_next(workptr, nxt); | |
1643 | } | |
1644 | } | |
1645 | ||
978db57e JA |
1646 | /* |
1647 | * Must only be used if we don't need to care about links, usually from | |
1648 | * within the completion handling itself. | |
1649 | */ | |
1650 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1651 | { |
1652 | /* drop both submit and complete references */ | |
1653 | if (refcount_sub_and_test(2, &req->refs)) | |
1654 | __io_free_req(req); | |
1655 | } | |
1656 | ||
978db57e JA |
1657 | static void io_double_put_req(struct io_kiocb *req) |
1658 | { | |
1659 | /* drop both submit and complete references */ | |
1660 | if (refcount_sub_and_test(2, &req->refs)) | |
1661 | io_free_req(req); | |
1662 | } | |
1663 | ||
1d7bb1d5 | 1664 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1665 | { |
84f97dc2 JA |
1666 | struct io_rings *rings = ctx->rings; |
1667 | ||
ad3eb2c8 JA |
1668 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1669 | /* | |
1670 | * noflush == true is from the waitqueue handler, just ensure | |
1671 | * we wake up the task, and the next invocation will flush the | |
1672 | * entries. We cannot safely to it from here. | |
1673 | */ | |
1674 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1675 | return -1U; | |
1d7bb1d5 | 1676 | |
ad3eb2c8 JA |
1677 | io_cqring_overflow_flush(ctx, false); |
1678 | } | |
1d7bb1d5 | 1679 | |
a3a0e43f JA |
1680 | /* See comment at the top of this file */ |
1681 | smp_rmb(); | |
ad3eb2c8 | 1682 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1683 | } |
1684 | ||
fb5ccc98 PB |
1685 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1686 | { | |
1687 | struct io_rings *rings = ctx->rings; | |
1688 | ||
1689 | /* make sure SQ entry isn't read before tail */ | |
1690 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
1691 | } | |
1692 | ||
8237e045 | 1693 | static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req) |
e94f141b | 1694 | { |
dea3b49c | 1695 | if ((req->flags & REQ_F_LINK_HEAD) || io_is_fallback_req(req)) |
c6ca97b3 | 1696 | return false; |
e94f141b | 1697 | |
c6ca97b3 JA |
1698 | if (!(req->flags & REQ_F_FIXED_FILE) || req->io) |
1699 | rb->need_iter++; | |
1700 | ||
1701 | rb->reqs[rb->to_free++] = req; | |
1702 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1703 | io_free_req_many(req->ctx, rb); | |
1704 | return true; | |
e94f141b JA |
1705 | } |
1706 | ||
bcda7baa JA |
1707 | static int io_put_kbuf(struct io_kiocb *req) |
1708 | { | |
4d954c25 | 1709 | struct io_buffer *kbuf; |
bcda7baa JA |
1710 | int cflags; |
1711 | ||
4d954c25 | 1712 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
bcda7baa JA |
1713 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
1714 | cflags |= IORING_CQE_F_BUFFER; | |
1715 | req->rw.addr = 0; | |
1716 | kfree(kbuf); | |
1717 | return cflags; | |
1718 | } | |
1719 | ||
def596e9 JA |
1720 | /* |
1721 | * Find and free completed poll iocbs | |
1722 | */ | |
1723 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1724 | struct list_head *done) | |
1725 | { | |
8237e045 | 1726 | struct req_batch rb; |
def596e9 | 1727 | struct io_kiocb *req; |
def596e9 | 1728 | |
c6ca97b3 | 1729 | rb.to_free = rb.need_iter = 0; |
def596e9 | 1730 | while (!list_empty(done)) { |
bcda7baa JA |
1731 | int cflags = 0; |
1732 | ||
def596e9 JA |
1733 | req = list_first_entry(done, struct io_kiocb, list); |
1734 | list_del(&req->list); | |
1735 | ||
bcda7baa JA |
1736 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1737 | cflags = io_put_kbuf(req); | |
1738 | ||
1739 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
1740 | (*nr_events)++; |
1741 | ||
8237e045 JA |
1742 | if (refcount_dec_and_test(&req->refs) && |
1743 | !io_req_multi_free(&rb, req)) | |
1744 | io_free_req(req); | |
def596e9 | 1745 | } |
def596e9 | 1746 | |
09bb8394 | 1747 | io_commit_cqring(ctx); |
32b2244a XW |
1748 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1749 | io_cqring_ev_posted(ctx); | |
8237e045 | 1750 | io_free_req_many(ctx, &rb); |
def596e9 JA |
1751 | } |
1752 | ||
581f9810 BM |
1753 | static void io_iopoll_queue(struct list_head *again) |
1754 | { | |
1755 | struct io_kiocb *req; | |
1756 | ||
1757 | do { | |
1758 | req = list_first_entry(again, struct io_kiocb, list); | |
1759 | list_del(&req->list); | |
1760 | refcount_inc(&req->refs); | |
1761 | io_queue_async_work(req); | |
1762 | } while (!list_empty(again)); | |
1763 | } | |
1764 | ||
def596e9 JA |
1765 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
1766 | long min) | |
1767 | { | |
1768 | struct io_kiocb *req, *tmp; | |
1769 | LIST_HEAD(done); | |
581f9810 | 1770 | LIST_HEAD(again); |
def596e9 JA |
1771 | bool spin; |
1772 | int ret; | |
1773 | ||
1774 | /* | |
1775 | * Only spin for completions if we don't have multiple devices hanging | |
1776 | * off our complete list, and we're under the requested amount. | |
1777 | */ | |
1778 | spin = !ctx->poll_multi_file && *nr_events < min; | |
1779 | ||
1780 | ret = 0; | |
1781 | list_for_each_entry_safe(req, tmp, &ctx->poll_list, list) { | |
9adbd45d | 1782 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
1783 | |
1784 | /* | |
581f9810 BM |
1785 | * Move completed and retryable entries to our local lists. |
1786 | * If we find a request that requires polling, break out | |
1787 | * and complete those lists first, if we have entries there. | |
def596e9 JA |
1788 | */ |
1789 | if (req->flags & REQ_F_IOPOLL_COMPLETED) { | |
1790 | list_move_tail(&req->list, &done); | |
1791 | continue; | |
1792 | } | |
1793 | if (!list_empty(&done)) | |
1794 | break; | |
1795 | ||
581f9810 BM |
1796 | if (req->result == -EAGAIN) { |
1797 | list_move_tail(&req->list, &again); | |
1798 | continue; | |
1799 | } | |
1800 | if (!list_empty(&again)) | |
1801 | break; | |
1802 | ||
def596e9 JA |
1803 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); |
1804 | if (ret < 0) | |
1805 | break; | |
1806 | ||
1807 | if (ret && spin) | |
1808 | spin = false; | |
1809 | ret = 0; | |
1810 | } | |
1811 | ||
1812 | if (!list_empty(&done)) | |
1813 | io_iopoll_complete(ctx, nr_events, &done); | |
1814 | ||
581f9810 BM |
1815 | if (!list_empty(&again)) |
1816 | io_iopoll_queue(&again); | |
1817 | ||
def596e9 JA |
1818 | return ret; |
1819 | } | |
1820 | ||
1821 | /* | |
d195a66e | 1822 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
1823 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
1824 | * as a non-spinning completion check. | |
1825 | */ | |
1826 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1827 | long min) | |
1828 | { | |
08f5439f | 1829 | while (!list_empty(&ctx->poll_list) && !need_resched()) { |
def596e9 JA |
1830 | int ret; |
1831 | ||
1832 | ret = io_do_iopoll(ctx, nr_events, min); | |
1833 | if (ret < 0) | |
1834 | return ret; | |
1835 | if (!min || *nr_events >= min) | |
1836 | return 0; | |
1837 | } | |
1838 | ||
1839 | return 1; | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * We can't just wait for polled events to come to us, we have to actively | |
1844 | * find and complete them. | |
1845 | */ | |
1846 | static void io_iopoll_reap_events(struct io_ring_ctx *ctx) | |
1847 | { | |
1848 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
1849 | return; | |
1850 | ||
1851 | mutex_lock(&ctx->uring_lock); | |
1852 | while (!list_empty(&ctx->poll_list)) { | |
1853 | unsigned int nr_events = 0; | |
1854 | ||
1855 | io_iopoll_getevents(ctx, &nr_events, 1); | |
08f5439f JA |
1856 | |
1857 | /* | |
1858 | * Ensure we allow local-to-the-cpu processing to take place, | |
1859 | * in this case we need to ensure that we reap all events. | |
1860 | */ | |
1861 | cond_resched(); | |
def596e9 JA |
1862 | } |
1863 | mutex_unlock(&ctx->uring_lock); | |
1864 | } | |
1865 | ||
c7849be9 XW |
1866 | static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events, |
1867 | long min) | |
def596e9 | 1868 | { |
2b2ed975 | 1869 | int iters = 0, ret = 0; |
500f9fba | 1870 | |
c7849be9 XW |
1871 | /* |
1872 | * We disallow the app entering submit/complete with polling, but we | |
1873 | * still need to lock the ring to prevent racing with polled issue | |
1874 | * that got punted to a workqueue. | |
1875 | */ | |
1876 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
1877 | do { |
1878 | int tmin = 0; | |
1879 | ||
a3a0e43f JA |
1880 | /* |
1881 | * Don't enter poll loop if we already have events pending. | |
1882 | * If we do, we can potentially be spinning for commands that | |
1883 | * already triggered a CQE (eg in error). | |
1884 | */ | |
1d7bb1d5 | 1885 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
1886 | break; |
1887 | ||
500f9fba JA |
1888 | /* |
1889 | * If a submit got punted to a workqueue, we can have the | |
1890 | * application entering polling for a command before it gets | |
1891 | * issued. That app will hold the uring_lock for the duration | |
1892 | * of the poll right here, so we need to take a breather every | |
1893 | * now and then to ensure that the issue has a chance to add | |
1894 | * the poll to the issued list. Otherwise we can spin here | |
1895 | * forever, while the workqueue is stuck trying to acquire the | |
1896 | * very same mutex. | |
1897 | */ | |
1898 | if (!(++iters & 7)) { | |
1899 | mutex_unlock(&ctx->uring_lock); | |
1900 | mutex_lock(&ctx->uring_lock); | |
1901 | } | |
1902 | ||
def596e9 JA |
1903 | if (*nr_events < min) |
1904 | tmin = min - *nr_events; | |
1905 | ||
1906 | ret = io_iopoll_getevents(ctx, nr_events, tmin); | |
1907 | if (ret <= 0) | |
1908 | break; | |
1909 | ret = 0; | |
1910 | } while (min && !*nr_events && !need_resched()); | |
1911 | ||
500f9fba | 1912 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
1913 | return ret; |
1914 | } | |
1915 | ||
491381ce | 1916 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 1917 | { |
491381ce JA |
1918 | /* |
1919 | * Tell lockdep we inherited freeze protection from submission | |
1920 | * thread. | |
1921 | */ | |
1922 | if (req->flags & REQ_F_ISREG) { | |
1923 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 1924 | |
491381ce | 1925 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 1926 | } |
491381ce | 1927 | file_end_write(req->file); |
2b188cc1 JA |
1928 | } |
1929 | ||
4e88d6e7 JA |
1930 | static inline void req_set_fail_links(struct io_kiocb *req) |
1931 | { | |
1932 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1933 | req->flags |= REQ_F_FAIL_LINK; | |
1934 | } | |
1935 | ||
ba816ad6 | 1936 | static void io_complete_rw_common(struct kiocb *kiocb, long res) |
2b188cc1 | 1937 | { |
9adbd45d | 1938 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 1939 | int cflags = 0; |
2b188cc1 | 1940 | |
491381ce JA |
1941 | if (kiocb->ki_flags & IOCB_WRITE) |
1942 | kiocb_end_write(req); | |
2b188cc1 | 1943 | |
4e88d6e7 JA |
1944 | if (res != req->result) |
1945 | req_set_fail_links(req); | |
bcda7baa JA |
1946 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1947 | cflags = io_put_kbuf(req); | |
1948 | __io_cqring_add_event(req, res, cflags); | |
ba816ad6 JA |
1949 | } |
1950 | ||
1951 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
1952 | { | |
9adbd45d | 1953 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 JA |
1954 | |
1955 | io_complete_rw_common(kiocb, res); | |
e65ef56d | 1956 | io_put_req(req); |
2b188cc1 JA |
1957 | } |
1958 | ||
def596e9 JA |
1959 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
1960 | { | |
9adbd45d | 1961 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 1962 | |
491381ce JA |
1963 | if (kiocb->ki_flags & IOCB_WRITE) |
1964 | kiocb_end_write(req); | |
def596e9 | 1965 | |
4e88d6e7 JA |
1966 | if (res != req->result) |
1967 | req_set_fail_links(req); | |
9e645e11 | 1968 | req->result = res; |
def596e9 JA |
1969 | if (res != -EAGAIN) |
1970 | req->flags |= REQ_F_IOPOLL_COMPLETED; | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * After the iocb has been issued, it's safe to be found on the poll list. | |
1975 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
1976 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
1977 | * accessing the kiocb cookie. | |
1978 | */ | |
1979 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
1980 | { | |
1981 | struct io_ring_ctx *ctx = req->ctx; | |
1982 | ||
1983 | /* | |
1984 | * Track whether we have multiple files in our lists. This will impact | |
1985 | * how we do polling eventually, not spinning if we're on potentially | |
1986 | * different devices. | |
1987 | */ | |
1988 | if (list_empty(&ctx->poll_list)) { | |
1989 | ctx->poll_multi_file = false; | |
1990 | } else if (!ctx->poll_multi_file) { | |
1991 | struct io_kiocb *list_req; | |
1992 | ||
1993 | list_req = list_first_entry(&ctx->poll_list, struct io_kiocb, | |
1994 | list); | |
9adbd45d | 1995 | if (list_req->file != req->file) |
def596e9 JA |
1996 | ctx->poll_multi_file = true; |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * For fast devices, IO may have already completed. If it has, add | |
2001 | * it to the front so we find it first. | |
2002 | */ | |
2003 | if (req->flags & REQ_F_IOPOLL_COMPLETED) | |
2004 | list_add(&req->list, &ctx->poll_list); | |
2005 | else | |
2006 | list_add_tail(&req->list, &ctx->poll_list); | |
bdcd3eab XW |
2007 | |
2008 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2009 | wq_has_sleeper(&ctx->sqo_wait)) | |
2010 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2011 | } |
2012 | ||
9f13c35b | 2013 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2014 | { |
9f13c35b | 2015 | int diff = state->has_refs - state->used_refs; |
9a56a232 | 2016 | |
9f13c35b PB |
2017 | if (diff) |
2018 | fput_many(state->file, diff); | |
2019 | state->file = NULL; | |
2020 | } | |
2021 | ||
2022 | static inline void io_state_file_put(struct io_submit_state *state) | |
2023 | { | |
2024 | if (state->file) | |
2025 | __io_state_file_put(state); | |
9a56a232 JA |
2026 | } |
2027 | ||
2028 | /* | |
2029 | * Get as many references to a file as we have IOs left in this submission, | |
2030 | * assuming most submissions are for one file, or at least that each file | |
2031 | * has more than one submission. | |
2032 | */ | |
8da11c19 | 2033 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2034 | { |
2035 | if (!state) | |
2036 | return fget(fd); | |
2037 | ||
2038 | if (state->file) { | |
2039 | if (state->fd == fd) { | |
2040 | state->used_refs++; | |
2041 | state->ios_left--; | |
2042 | return state->file; | |
2043 | } | |
9f13c35b | 2044 | __io_state_file_put(state); |
9a56a232 JA |
2045 | } |
2046 | state->file = fget_many(fd, state->ios_left); | |
2047 | if (!state->file) | |
2048 | return NULL; | |
2049 | ||
2050 | state->fd = fd; | |
2051 | state->has_refs = state->ios_left; | |
2052 | state->used_refs = 1; | |
2053 | state->ios_left--; | |
2054 | return state->file; | |
2055 | } | |
2056 | ||
2b188cc1 JA |
2057 | /* |
2058 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2059 | * any file. For now, just ensure that anything potentially problematic is done | |
2060 | * inline. | |
2061 | */ | |
af197f50 | 2062 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2063 | { |
2064 | umode_t mode = file_inode(file)->i_mode; | |
2065 | ||
10d59345 | 2066 | if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISSOCK(mode)) |
2b188cc1 JA |
2067 | return true; |
2068 | if (S_ISREG(mode) && file->f_op != &io_uring_fops) | |
2069 | return true; | |
2070 | ||
af197f50 JA |
2071 | if (!(file->f_mode & FMODE_NOWAIT)) |
2072 | return false; | |
2073 | ||
2074 | if (rw == READ) | |
2075 | return file->f_op->read_iter != NULL; | |
2076 | ||
2077 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2078 | } |
2079 | ||
3529d8c2 JA |
2080 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2081 | bool force_nonblock) | |
2b188cc1 | 2082 | { |
def596e9 | 2083 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2084 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2085 | unsigned ioprio; |
2086 | int ret; | |
2b188cc1 | 2087 | |
491381ce JA |
2088 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2089 | req->flags |= REQ_F_ISREG; | |
2090 | ||
2b188cc1 | 2091 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2092 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2093 | req->flags |= REQ_F_CUR_POS; | |
2094 | kiocb->ki_pos = req->file->f_pos; | |
2095 | } | |
2b188cc1 | 2096 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2097 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2098 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2099 | if (unlikely(ret)) | |
2100 | return ret; | |
2b188cc1 JA |
2101 | |
2102 | ioprio = READ_ONCE(sqe->ioprio); | |
2103 | if (ioprio) { | |
2104 | ret = ioprio_check_cap(ioprio); | |
2105 | if (ret) | |
09bb8394 | 2106 | return ret; |
2b188cc1 JA |
2107 | |
2108 | kiocb->ki_ioprio = ioprio; | |
2109 | } else | |
2110 | kiocb->ki_ioprio = get_current_ioprio(); | |
2111 | ||
8449eeda | 2112 | /* don't allow async punt if RWF_NOWAIT was requested */ |
491381ce JA |
2113 | if ((kiocb->ki_flags & IOCB_NOWAIT) || |
2114 | (req->file->f_flags & O_NONBLOCK)) | |
8449eeda SB |
2115 | req->flags |= REQ_F_NOWAIT; |
2116 | ||
2117 | if (force_nonblock) | |
2b188cc1 | 2118 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2119 | |
def596e9 | 2120 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2121 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2122 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2123 | return -EOPNOTSUPP; |
2b188cc1 | 2124 | |
def596e9 JA |
2125 | kiocb->ki_flags |= IOCB_HIPRI; |
2126 | kiocb->ki_complete = io_complete_rw_iopoll; | |
6873e0bd | 2127 | req->result = 0; |
def596e9 | 2128 | } else { |
09bb8394 JA |
2129 | if (kiocb->ki_flags & IOCB_HIPRI) |
2130 | return -EINVAL; | |
def596e9 JA |
2131 | kiocb->ki_complete = io_complete_rw; |
2132 | } | |
9adbd45d | 2133 | |
3529d8c2 JA |
2134 | req->rw.addr = READ_ONCE(sqe->addr); |
2135 | req->rw.len = READ_ONCE(sqe->len); | |
bcda7baa | 2136 | /* we own ->private, reuse it for the buffer index / buffer ID */ |
9adbd45d | 2137 | req->rw.kiocb.private = (void *) (unsigned long) |
3529d8c2 | 2138 | READ_ONCE(sqe->buf_index); |
2b188cc1 | 2139 | return 0; |
2b188cc1 JA |
2140 | } |
2141 | ||
2142 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2143 | { | |
2144 | switch (ret) { | |
2145 | case -EIOCBQUEUED: | |
2146 | break; | |
2147 | case -ERESTARTSYS: | |
2148 | case -ERESTARTNOINTR: | |
2149 | case -ERESTARTNOHAND: | |
2150 | case -ERESTART_RESTARTBLOCK: | |
2151 | /* | |
2152 | * We can't just restart the syscall, since previously | |
2153 | * submitted sqes may already be in progress. Just fail this | |
2154 | * IO with EINTR. | |
2155 | */ | |
2156 | ret = -EINTR; | |
2157 | /* fall through */ | |
2158 | default: | |
2159 | kiocb->ki_complete(kiocb, ret, 0); | |
2160 | } | |
2161 | } | |
2162 | ||
014db007 | 2163 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret) |
ba816ad6 | 2164 | { |
ba04291e JA |
2165 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2166 | ||
2167 | if (req->flags & REQ_F_CUR_POS) | |
2168 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2169 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
014db007 | 2170 | io_complete_rw(kiocb, ret, 0); |
ba816ad6 JA |
2171 | else |
2172 | io_rw_done(kiocb, ret); | |
2173 | } | |
2174 | ||
9adbd45d | 2175 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2176 | struct iov_iter *iter) |
edafccee | 2177 | { |
9adbd45d JA |
2178 | struct io_ring_ctx *ctx = req->ctx; |
2179 | size_t len = req->rw.len; | |
edafccee JA |
2180 | struct io_mapped_ubuf *imu; |
2181 | unsigned index, buf_index; | |
2182 | size_t offset; | |
2183 | u64 buf_addr; | |
2184 | ||
2185 | /* attempt to use fixed buffers without having provided iovecs */ | |
2186 | if (unlikely(!ctx->user_bufs)) | |
2187 | return -EFAULT; | |
2188 | ||
9adbd45d | 2189 | buf_index = (unsigned long) req->rw.kiocb.private; |
edafccee JA |
2190 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2191 | return -EFAULT; | |
2192 | ||
2193 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2194 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2195 | buf_addr = req->rw.addr; |
edafccee JA |
2196 | |
2197 | /* overflow */ | |
2198 | if (buf_addr + len < buf_addr) | |
2199 | return -EFAULT; | |
2200 | /* not inside the mapped region */ | |
2201 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2202 | return -EFAULT; | |
2203 | ||
2204 | /* | |
2205 | * May not be a start of buffer, set size appropriately | |
2206 | * and advance us to the beginning. | |
2207 | */ | |
2208 | offset = buf_addr - imu->ubuf; | |
2209 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2210 | |
2211 | if (offset) { | |
2212 | /* | |
2213 | * Don't use iov_iter_advance() here, as it's really slow for | |
2214 | * using the latter parts of a big fixed buffer - it iterates | |
2215 | * over each segment manually. We can cheat a bit here, because | |
2216 | * we know that: | |
2217 | * | |
2218 | * 1) it's a BVEC iter, we set it up | |
2219 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2220 | * first and last bvec | |
2221 | * | |
2222 | * So just find our index, and adjust the iterator afterwards. | |
2223 | * If the offset is within the first bvec (or the whole first | |
2224 | * bvec, just use iov_iter_advance(). This makes it easier | |
2225 | * since we can just skip the first segment, which may not | |
2226 | * be PAGE_SIZE aligned. | |
2227 | */ | |
2228 | const struct bio_vec *bvec = imu->bvec; | |
2229 | ||
2230 | if (offset <= bvec->bv_len) { | |
2231 | iov_iter_advance(iter, offset); | |
2232 | } else { | |
2233 | unsigned long seg_skip; | |
2234 | ||
2235 | /* skip first vec */ | |
2236 | offset -= bvec->bv_len; | |
2237 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2238 | ||
2239 | iter->bvec = bvec + seg_skip; | |
2240 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2241 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2242 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2243 | } |
2244 | } | |
2245 | ||
5e559561 | 2246 | return len; |
edafccee JA |
2247 | } |
2248 | ||
bcda7baa JA |
2249 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2250 | { | |
2251 | if (needs_lock) | |
2252 | mutex_unlock(&ctx->uring_lock); | |
2253 | } | |
2254 | ||
2255 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2256 | { | |
2257 | /* | |
2258 | * "Normal" inline submissions always hold the uring_lock, since we | |
2259 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2260 | * The only exception is when we've detached the request and issue it | |
2261 | * from an async worker thread, grab the lock for that case. | |
2262 | */ | |
2263 | if (needs_lock) | |
2264 | mutex_lock(&ctx->uring_lock); | |
2265 | } | |
2266 | ||
2267 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2268 | int bgid, struct io_buffer *kbuf, | |
2269 | bool needs_lock) | |
2270 | { | |
2271 | struct io_buffer *head; | |
2272 | ||
2273 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2274 | return kbuf; | |
2275 | ||
2276 | io_ring_submit_lock(req->ctx, needs_lock); | |
2277 | ||
2278 | lockdep_assert_held(&req->ctx->uring_lock); | |
2279 | ||
2280 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2281 | if (head) { | |
2282 | if (!list_empty(&head->list)) { | |
2283 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2284 | list); | |
2285 | list_del(&kbuf->list); | |
2286 | } else { | |
2287 | kbuf = head; | |
2288 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2289 | } | |
2290 | if (*len > kbuf->len) | |
2291 | *len = kbuf->len; | |
2292 | } else { | |
2293 | kbuf = ERR_PTR(-ENOBUFS); | |
2294 | } | |
2295 | ||
2296 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2297 | ||
2298 | return kbuf; | |
2299 | } | |
2300 | ||
4d954c25 JA |
2301 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2302 | bool needs_lock) | |
2303 | { | |
2304 | struct io_buffer *kbuf; | |
2305 | int bgid; | |
2306 | ||
2307 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2308 | bgid = (int) (unsigned long) req->rw.kiocb.private; | |
2309 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); | |
2310 | if (IS_ERR(kbuf)) | |
2311 | return kbuf; | |
2312 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2313 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2314 | return u64_to_user_ptr(kbuf->addr); | |
2315 | } | |
2316 | ||
2317 | #ifdef CONFIG_COMPAT | |
2318 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2319 | bool needs_lock) | |
2320 | { | |
2321 | struct compat_iovec __user *uiov; | |
2322 | compat_ssize_t clen; | |
2323 | void __user *buf; | |
2324 | ssize_t len; | |
2325 | ||
2326 | uiov = u64_to_user_ptr(req->rw.addr); | |
2327 | if (!access_ok(uiov, sizeof(*uiov))) | |
2328 | return -EFAULT; | |
2329 | if (__get_user(clen, &uiov->iov_len)) | |
2330 | return -EFAULT; | |
2331 | if (clen < 0) | |
2332 | return -EINVAL; | |
2333 | ||
2334 | len = clen; | |
2335 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2336 | if (IS_ERR(buf)) | |
2337 | return PTR_ERR(buf); | |
2338 | iov[0].iov_base = buf; | |
2339 | iov[0].iov_len = (compat_size_t) len; | |
2340 | return 0; | |
2341 | } | |
2342 | #endif | |
2343 | ||
2344 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2345 | bool needs_lock) | |
2346 | { | |
2347 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2348 | void __user *buf; | |
2349 | ssize_t len; | |
2350 | ||
2351 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2352 | return -EFAULT; | |
2353 | ||
2354 | len = iov[0].iov_len; | |
2355 | if (len < 0) | |
2356 | return -EINVAL; | |
2357 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2358 | if (IS_ERR(buf)) | |
2359 | return PTR_ERR(buf); | |
2360 | iov[0].iov_base = buf; | |
2361 | iov[0].iov_len = len; | |
2362 | return 0; | |
2363 | } | |
2364 | ||
2365 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2366 | bool needs_lock) | |
2367 | { | |
2368 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2369 | return 0; | |
2370 | if (!req->rw.len) | |
2371 | return 0; | |
2372 | else if (req->rw.len > 1) | |
2373 | return -EINVAL; | |
2374 | ||
2375 | #ifdef CONFIG_COMPAT | |
2376 | if (req->ctx->compat) | |
2377 | return io_compat_import(req, iov, needs_lock); | |
2378 | #endif | |
2379 | ||
2380 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2381 | } | |
2382 | ||
cf6fd4bd | 2383 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2384 | struct iovec **iovec, struct iov_iter *iter, |
2385 | bool needs_lock) | |
2b188cc1 | 2386 | { |
9adbd45d JA |
2387 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2388 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2389 | ssize_t ret; |
edafccee JA |
2390 | u8 opcode; |
2391 | ||
d625c6ee | 2392 | opcode = req->opcode; |
7d009165 | 2393 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2394 | *iovec = NULL; |
9adbd45d | 2395 | return io_import_fixed(req, rw, iter); |
edafccee | 2396 | } |
2b188cc1 | 2397 | |
bcda7baa JA |
2398 | /* buffer index only valid with fixed read/write, or buffer select */ |
2399 | if (req->rw.kiocb.private && !(req->flags & REQ_F_BUFFER_SELECT)) | |
9adbd45d JA |
2400 | return -EINVAL; |
2401 | ||
3a6820f2 | 2402 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2403 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2404 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2405 | if (IS_ERR(buf)) { | |
bcda7baa | 2406 | *iovec = NULL; |
4d954c25 | 2407 | return PTR_ERR(buf); |
bcda7baa | 2408 | } |
3f9d6441 | 2409 | req->rw.len = sqe_len; |
bcda7baa JA |
2410 | } |
2411 | ||
3a6820f2 JA |
2412 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2413 | *iovec = NULL; | |
3a901598 | 2414 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2415 | } |
2416 | ||
f67676d1 JA |
2417 | if (req->io) { |
2418 | struct io_async_rw *iorw = &req->io->rw; | |
2419 | ||
2420 | *iovec = iorw->iov; | |
2421 | iov_iter_init(iter, rw, *iovec, iorw->nr_segs, iorw->size); | |
2422 | if (iorw->iov == iorw->fast_iov) | |
2423 | *iovec = NULL; | |
2424 | return iorw->size; | |
2425 | } | |
2426 | ||
4d954c25 JA |
2427 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2428 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2429 | if (!ret) { |
2430 | ret = (*iovec)->iov_len; | |
2431 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2432 | } | |
4d954c25 JA |
2433 | *iovec = NULL; |
2434 | return ret; | |
2435 | } | |
2436 | ||
2b188cc1 | 2437 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2438 | if (req->ctx->compat) |
2b188cc1 JA |
2439 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2440 | iovec, iter); | |
2441 | #endif | |
2442 | ||
2443 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2444 | } | |
2445 | ||
31b51510 | 2446 | /* |
32960613 JA |
2447 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2448 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2449 | */ |
32960613 JA |
2450 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2451 | struct iov_iter *iter) | |
2452 | { | |
2453 | ssize_t ret = 0; | |
2454 | ||
2455 | /* | |
2456 | * Don't support polled IO through this interface, and we can't | |
2457 | * support non-blocking either. For the latter, this just causes | |
2458 | * the kiocb to be handled from an async context. | |
2459 | */ | |
2460 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2461 | return -EOPNOTSUPP; | |
2462 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2463 | return -EAGAIN; | |
2464 | ||
2465 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2466 | struct iovec iovec; |
32960613 JA |
2467 | ssize_t nr; |
2468 | ||
311ae9e1 PB |
2469 | if (!iov_iter_is_bvec(iter)) { |
2470 | iovec = iov_iter_iovec(iter); | |
2471 | } else { | |
2472 | /* fixed buffers import bvec */ | |
2473 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2474 | + iter->iov_offset; | |
2475 | iovec.iov_len = min(iter->count, | |
2476 | iter->bvec->bv_len - iter->iov_offset); | |
2477 | } | |
2478 | ||
32960613 JA |
2479 | if (rw == READ) { |
2480 | nr = file->f_op->read(file, iovec.iov_base, | |
2481 | iovec.iov_len, &kiocb->ki_pos); | |
2482 | } else { | |
2483 | nr = file->f_op->write(file, iovec.iov_base, | |
2484 | iovec.iov_len, &kiocb->ki_pos); | |
2485 | } | |
2486 | ||
311ae9e1 PB |
2487 | if (iov_iter_is_bvec(iter)) |
2488 | kunmap(iter->bvec->bv_page); | |
2489 | ||
32960613 JA |
2490 | if (nr < 0) { |
2491 | if (!ret) | |
2492 | ret = nr; | |
2493 | break; | |
2494 | } | |
2495 | ret += nr; | |
2496 | if (nr != iovec.iov_len) | |
2497 | break; | |
2498 | iov_iter_advance(iter, nr); | |
2499 | } | |
2500 | ||
2501 | return ret; | |
2502 | } | |
2503 | ||
b7bb4f7d | 2504 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2505 | struct iovec *iovec, struct iovec *fast_iov, |
2506 | struct iov_iter *iter) | |
2507 | { | |
2508 | req->io->rw.nr_segs = iter->nr_segs; | |
2509 | req->io->rw.size = io_size; | |
2510 | req->io->rw.iov = iovec; | |
2511 | if (!req->io->rw.iov) { | |
2512 | req->io->rw.iov = req->io->rw.fast_iov; | |
45097dae XW |
2513 | if (req->io->rw.iov != fast_iov) |
2514 | memcpy(req->io->rw.iov, fast_iov, | |
2515 | sizeof(struct iovec) * iter->nr_segs); | |
99bc4c38 PB |
2516 | } else { |
2517 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
2518 | } |
2519 | } | |
2520 | ||
3d9932a8 XW |
2521 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2522 | { | |
2523 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2524 | return req->io == NULL; | |
2525 | } | |
2526 | ||
b7bb4f7d | 2527 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2528 | { |
d3656344 JA |
2529 | if (!io_op_defs[req->opcode].async_ctx) |
2530 | return 0; | |
3d9932a8 XW |
2531 | |
2532 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2533 | } |
2534 | ||
b7bb4f7d JA |
2535 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2536 | struct iovec *iovec, struct iovec *fast_iov, | |
2537 | struct iov_iter *iter) | |
2538 | { | |
980ad263 | 2539 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2540 | return 0; |
5d204bcf | 2541 | if (!req->io) { |
3d9932a8 | 2542 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2543 | return -ENOMEM; |
b7bb4f7d | 2544 | |
5d204bcf JA |
2545 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2546 | } | |
b7bb4f7d | 2547 | return 0; |
f67676d1 JA |
2548 | } |
2549 | ||
3529d8c2 JA |
2550 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2551 | bool force_nonblock) | |
f67676d1 | 2552 | { |
3529d8c2 JA |
2553 | struct io_async_ctx *io; |
2554 | struct iov_iter iter; | |
f67676d1 JA |
2555 | ssize_t ret; |
2556 | ||
3529d8c2 JA |
2557 | ret = io_prep_rw(req, sqe, force_nonblock); |
2558 | if (ret) | |
2559 | return ret; | |
f67676d1 | 2560 | |
3529d8c2 JA |
2561 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
2562 | return -EBADF; | |
f67676d1 | 2563 | |
5f798bea PB |
2564 | /* either don't need iovec imported or already have it */ |
2565 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2566 | return 0; |
2567 | ||
2568 | io = req->io; | |
2569 | io->rw.iov = io->rw.fast_iov; | |
2570 | req->io = NULL; | |
bcda7baa | 2571 | ret = io_import_iovec(READ, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2572 | req->io = io; |
2573 | if (ret < 0) | |
2574 | return ret; | |
2575 | ||
2576 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2577 | return 0; | |
f67676d1 JA |
2578 | } |
2579 | ||
014db007 | 2580 | static int io_read(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2581 | { |
2582 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2583 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2584 | struct iov_iter iter; |
31b51510 | 2585 | size_t iov_count; |
f67676d1 | 2586 | ssize_t io_size, ret; |
2b188cc1 | 2587 | |
bcda7baa | 2588 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2589 | if (ret < 0) |
2590 | return ret; | |
2b188cc1 | 2591 | |
fd6c2e4c JA |
2592 | /* Ensure we clear previously set non-block flag */ |
2593 | if (!force_nonblock) | |
29de5f6a | 2594 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2595 | |
797f3f53 | 2596 | req->result = 0; |
f67676d1 | 2597 | io_size = ret; |
dea3b49c | 2598 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 JA |
2599 | req->result = io_size; |
2600 | ||
2601 | /* | |
2602 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2603 | * we know to async punt it even if it was opened O_NONBLOCK | |
2604 | */ | |
af197f50 | 2605 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 2606 | goto copy_iov; |
9e645e11 | 2607 | |
31b51510 | 2608 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2609 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 JA |
2610 | if (!ret) { |
2611 | ssize_t ret2; | |
2612 | ||
9adbd45d JA |
2613 | if (req->file->f_op->read_iter) |
2614 | ret2 = call_read_iter(req->file, kiocb, &iter); | |
32960613 | 2615 | else |
9adbd45d | 2616 | ret2 = loop_rw_iter(READ, req->file, kiocb, &iter); |
32960613 | 2617 | |
9d93a3f5 | 2618 | /* Catch -EAGAIN return for forced non-blocking submission */ |
f67676d1 | 2619 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2620 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2621 | } else { |
2622 | copy_iov: | |
b7bb4f7d | 2623 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2624 | inline_vecs, &iter); |
2625 | if (ret) | |
2626 | goto out_free; | |
29de5f6a | 2627 | /* any defer here is final, must blocking retry */ |
490e8967 JA |
2628 | if (!(req->flags & REQ_F_NOWAIT) && |
2629 | !file_can_poll(req->file)) | |
29de5f6a | 2630 | req->flags |= REQ_F_MUST_PUNT; |
f67676d1 JA |
2631 | return -EAGAIN; |
2632 | } | |
2b188cc1 | 2633 | } |
f67676d1 | 2634 | out_free: |
1e95081c | 2635 | kfree(iovec); |
99bc4c38 | 2636 | req->flags &= ~REQ_F_NEED_CLEANUP; |
2b188cc1 JA |
2637 | return ret; |
2638 | } | |
2639 | ||
3529d8c2 JA |
2640 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2641 | bool force_nonblock) | |
f67676d1 | 2642 | { |
3529d8c2 JA |
2643 | struct io_async_ctx *io; |
2644 | struct iov_iter iter; | |
f67676d1 JA |
2645 | ssize_t ret; |
2646 | ||
3529d8c2 JA |
2647 | ret = io_prep_rw(req, sqe, force_nonblock); |
2648 | if (ret) | |
2649 | return ret; | |
f67676d1 | 2650 | |
3529d8c2 JA |
2651 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
2652 | return -EBADF; | |
f67676d1 | 2653 | |
4ed734b0 JA |
2654 | req->fsize = rlimit(RLIMIT_FSIZE); |
2655 | ||
5f798bea PB |
2656 | /* either don't need iovec imported or already have it */ |
2657 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2658 | return 0; |
2659 | ||
2660 | io = req->io; | |
2661 | io->rw.iov = io->rw.fast_iov; | |
2662 | req->io = NULL; | |
bcda7baa | 2663 | ret = io_import_iovec(WRITE, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2664 | req->io = io; |
2665 | if (ret < 0) | |
2666 | return ret; | |
2667 | ||
2668 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2669 | return 0; | |
f67676d1 JA |
2670 | } |
2671 | ||
014db007 | 2672 | static int io_write(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2673 | { |
2674 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2675 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2676 | struct iov_iter iter; |
31b51510 | 2677 | size_t iov_count; |
f67676d1 | 2678 | ssize_t ret, io_size; |
2b188cc1 | 2679 | |
bcda7baa | 2680 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2681 | if (ret < 0) |
2682 | return ret; | |
2b188cc1 | 2683 | |
fd6c2e4c JA |
2684 | /* Ensure we clear previously set non-block flag */ |
2685 | if (!force_nonblock) | |
9adbd45d | 2686 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2687 | |
797f3f53 | 2688 | req->result = 0; |
f67676d1 | 2689 | io_size = ret; |
dea3b49c | 2690 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 | 2691 | req->result = io_size; |
9e645e11 | 2692 | |
f67676d1 JA |
2693 | /* |
2694 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2695 | * we know to async punt it even if it was opened O_NONBLOCK | |
2696 | */ | |
af197f50 | 2697 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 2698 | goto copy_iov; |
31b51510 | 2699 | |
10d59345 JA |
2700 | /* file path doesn't support NOWAIT for non-direct_IO */ |
2701 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
2702 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 2703 | goto copy_iov; |
31b51510 | 2704 | |
f67676d1 | 2705 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2706 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 2707 | if (!ret) { |
9bf7933f RP |
2708 | ssize_t ret2; |
2709 | ||
2b188cc1 JA |
2710 | /* |
2711 | * Open-code file_start_write here to grab freeze protection, | |
2712 | * which will be released by another thread in | |
2713 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
2714 | * released so that it doesn't complain about the held lock when | |
2715 | * we return to userspace. | |
2716 | */ | |
491381ce | 2717 | if (req->flags & REQ_F_ISREG) { |
9adbd45d | 2718 | __sb_start_write(file_inode(req->file)->i_sb, |
2b188cc1 | 2719 | SB_FREEZE_WRITE, true); |
9adbd45d | 2720 | __sb_writers_release(file_inode(req->file)->i_sb, |
2b188cc1 JA |
2721 | SB_FREEZE_WRITE); |
2722 | } | |
2723 | kiocb->ki_flags |= IOCB_WRITE; | |
9bf7933f | 2724 | |
4ed734b0 JA |
2725 | if (!force_nonblock) |
2726 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; | |
2727 | ||
9adbd45d JA |
2728 | if (req->file->f_op->write_iter) |
2729 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
32960613 | 2730 | else |
9adbd45d | 2731 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
4ed734b0 JA |
2732 | |
2733 | if (!force_nonblock) | |
2734 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
2735 | ||
faac996c | 2736 | /* |
bff6035d | 2737 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
faac996c JA |
2738 | * retry them without IOCB_NOWAIT. |
2739 | */ | |
2740 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
2741 | ret2 = -EAGAIN; | |
f67676d1 | 2742 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2743 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2744 | } else { |
2745 | copy_iov: | |
b7bb4f7d | 2746 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2747 | inline_vecs, &iter); |
2748 | if (ret) | |
2749 | goto out_free; | |
29de5f6a | 2750 | /* any defer here is final, must blocking retry */ |
490e8967 JA |
2751 | if (!file_can_poll(req->file)) |
2752 | req->flags |= REQ_F_MUST_PUNT; | |
f67676d1 JA |
2753 | return -EAGAIN; |
2754 | } | |
2b188cc1 | 2755 | } |
31b51510 | 2756 | out_free: |
99bc4c38 | 2757 | req->flags &= ~REQ_F_NEED_CLEANUP; |
1e95081c | 2758 | kfree(iovec); |
2b188cc1 JA |
2759 | return ret; |
2760 | } | |
2761 | ||
f2a8d5c7 PB |
2762 | static int __io_splice_prep(struct io_kiocb *req, |
2763 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
2764 | { |
2765 | struct io_splice* sp = &req->splice; | |
2766 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
2767 | int ret; | |
2768 | ||
2769 | if (req->flags & REQ_F_NEED_CLEANUP) | |
2770 | return 0; | |
2771 | ||
2772 | sp->file_in = NULL; | |
7d67af2c PB |
2773 | sp->len = READ_ONCE(sqe->len); |
2774 | sp->flags = READ_ONCE(sqe->splice_flags); | |
2775 | ||
2776 | if (unlikely(sp->flags & ~valid_flags)) | |
2777 | return -EINVAL; | |
2778 | ||
2779 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
2780 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2781 | if (ret) | |
2782 | return ret; | |
2783 | req->flags |= REQ_F_NEED_CLEANUP; | |
2784 | ||
2785 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) | |
2786 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
2787 | ||
2788 | return 0; | |
2789 | } | |
2790 | ||
f2a8d5c7 PB |
2791 | static int io_tee_prep(struct io_kiocb *req, |
2792 | const struct io_uring_sqe *sqe) | |
2793 | { | |
2794 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
2795 | return -EINVAL; | |
2796 | return __io_splice_prep(req, sqe); | |
2797 | } | |
2798 | ||
2799 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
2800 | { | |
2801 | struct io_splice *sp = &req->splice; | |
2802 | struct file *in = sp->file_in; | |
2803 | struct file *out = sp->file_out; | |
2804 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2805 | long ret = 0; | |
2806 | ||
2807 | if (force_nonblock) | |
2808 | return -EAGAIN; | |
2809 | if (sp->len) | |
2810 | ret = do_tee(in, out, sp->len, flags); | |
2811 | ||
2812 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2813 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2814 | ||
2815 | io_cqring_add_event(req, ret); | |
2816 | if (ret != sp->len) | |
2817 | req_set_fail_links(req); | |
2818 | io_put_req(req); | |
2819 | return 0; | |
2820 | } | |
2821 | ||
2822 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
2823 | { | |
2824 | struct io_splice* sp = &req->splice; | |
2825 | ||
2826 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
2827 | sp->off_out = READ_ONCE(sqe->off); | |
2828 | return __io_splice_prep(req, sqe); | |
2829 | } | |
2830 | ||
014db007 | 2831 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
2832 | { |
2833 | struct io_splice *sp = &req->splice; | |
2834 | struct file *in = sp->file_in; | |
2835 | struct file *out = sp->file_out; | |
2836 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2837 | loff_t *poff_in, *poff_out; | |
2838 | long ret; | |
2839 | ||
2fb3e822 PB |
2840 | if (force_nonblock) |
2841 | return -EAGAIN; | |
7d67af2c PB |
2842 | |
2843 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
2844 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
2845 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); | |
2846 | if (force_nonblock && ret == -EAGAIN) | |
2847 | return -EAGAIN; | |
2848 | ||
2849 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2850 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2851 | ||
2852 | io_cqring_add_event(req, ret); | |
2853 | if (ret != sp->len) | |
2854 | req_set_fail_links(req); | |
014db007 | 2855 | io_put_req(req); |
7d67af2c PB |
2856 | return 0; |
2857 | } | |
2858 | ||
2b188cc1 JA |
2859 | /* |
2860 | * IORING_OP_NOP just posts a completion event, nothing else. | |
2861 | */ | |
78e19bbe | 2862 | static int io_nop(struct io_kiocb *req) |
2b188cc1 JA |
2863 | { |
2864 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 2865 | |
def596e9 JA |
2866 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
2867 | return -EINVAL; | |
2868 | ||
78e19bbe | 2869 | io_cqring_add_event(req, 0); |
e65ef56d | 2870 | io_put_req(req); |
2b188cc1 JA |
2871 | return 0; |
2872 | } | |
2873 | ||
3529d8c2 | 2874 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 2875 | { |
6b06314c | 2876 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 2877 | |
09bb8394 JA |
2878 | if (!req->file) |
2879 | return -EBADF; | |
c992fe29 | 2880 | |
6b06314c | 2881 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 2882 | return -EINVAL; |
edafccee | 2883 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
2884 | return -EINVAL; |
2885 | ||
8ed8d3c3 JA |
2886 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
2887 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
2888 | return -EINVAL; | |
2889 | ||
2890 | req->sync.off = READ_ONCE(sqe->off); | |
2891 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
2892 | return 0; |
2893 | } | |
2894 | ||
8ed8d3c3 JA |
2895 | static bool io_req_cancelled(struct io_kiocb *req) |
2896 | { | |
2897 | if (req->work.flags & IO_WQ_WORK_CANCEL) { | |
2898 | req_set_fail_links(req); | |
2899 | io_cqring_add_event(req, -ECANCELED); | |
2900 | io_put_req(req); | |
2901 | return true; | |
2902 | } | |
2903 | ||
2904 | return false; | |
2905 | } | |
2906 | ||
014db007 | 2907 | static void __io_fsync(struct io_kiocb *req) |
8ed8d3c3 | 2908 | { |
8ed8d3c3 | 2909 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
2910 | int ret; |
2911 | ||
9adbd45d | 2912 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
2913 | end > 0 ? end : LLONG_MAX, |
2914 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
2915 | if (ret < 0) | |
2916 | req_set_fail_links(req); | |
2917 | io_cqring_add_event(req, ret); | |
014db007 | 2918 | io_put_req(req); |
8ed8d3c3 JA |
2919 | } |
2920 | ||
5ea62161 | 2921 | static void io_fsync_finish(struct io_wq_work **workptr) |
c992fe29 | 2922 | { |
5ea62161 | 2923 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); |
5ea62161 PB |
2924 | |
2925 | if (io_req_cancelled(req)) | |
2926 | return; | |
014db007 | 2927 | __io_fsync(req); |
e9fd9396 | 2928 | io_steal_work(req, workptr); |
8ed8d3c3 | 2929 | } |
c992fe29 | 2930 | |
014db007 | 2931 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
c992fe29 | 2932 | { |
c992fe29 | 2933 | /* fsync always requires a blocking context */ |
8ed8d3c3 | 2934 | if (force_nonblock) { |
8ed8d3c3 | 2935 | req->work.func = io_fsync_finish; |
c992fe29 | 2936 | return -EAGAIN; |
8ed8d3c3 | 2937 | } |
014db007 | 2938 | __io_fsync(req); |
c992fe29 CH |
2939 | return 0; |
2940 | } | |
2941 | ||
014db007 | 2942 | static void __io_fallocate(struct io_kiocb *req) |
8ed8d3c3 | 2943 | { |
8ed8d3c3 JA |
2944 | int ret; |
2945 | ||
4ed734b0 | 2946 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; |
d63d1b5e JA |
2947 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
2948 | req->sync.len); | |
4ed734b0 | 2949 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
8ed8d3c3 JA |
2950 | if (ret < 0) |
2951 | req_set_fail_links(req); | |
2952 | io_cqring_add_event(req, ret); | |
014db007 | 2953 | io_put_req(req); |
5ea62161 PB |
2954 | } |
2955 | ||
2956 | static void io_fallocate_finish(struct io_wq_work **workptr) | |
2957 | { | |
2958 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
5ea62161 | 2959 | |
594506fe PB |
2960 | if (io_req_cancelled(req)) |
2961 | return; | |
014db007 | 2962 | __io_fallocate(req); |
e9fd9396 | 2963 | io_steal_work(req, workptr); |
5d17b4a4 JA |
2964 | } |
2965 | ||
d63d1b5e JA |
2966 | static int io_fallocate_prep(struct io_kiocb *req, |
2967 | const struct io_uring_sqe *sqe) | |
2968 | { | |
2969 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
2970 | return -EINVAL; | |
2971 | ||
2972 | req->sync.off = READ_ONCE(sqe->off); | |
2973 | req->sync.len = READ_ONCE(sqe->addr); | |
2974 | req->sync.mode = READ_ONCE(sqe->len); | |
4ed734b0 | 2975 | req->fsize = rlimit(RLIMIT_FSIZE); |
d63d1b5e JA |
2976 | return 0; |
2977 | } | |
2978 | ||
014db007 | 2979 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 2980 | { |
d63d1b5e | 2981 | /* fallocate always requiring blocking context */ |
8ed8d3c3 | 2982 | if (force_nonblock) { |
d63d1b5e | 2983 | req->work.func = io_fallocate_finish; |
5d17b4a4 | 2984 | return -EAGAIN; |
8ed8d3c3 | 2985 | } |
5d17b4a4 | 2986 | |
014db007 | 2987 | __io_fallocate(req); |
5d17b4a4 JA |
2988 | return 0; |
2989 | } | |
2990 | ||
15b71abe | 2991 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 2992 | { |
f8748881 | 2993 | const char __user *fname; |
15b71abe | 2994 | int ret; |
b7bb4f7d | 2995 | |
15b71abe JA |
2996 | if (sqe->ioprio || sqe->buf_index) |
2997 | return -EINVAL; | |
9c280f90 | 2998 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 2999 | return -EBADF; |
0bdbdd08 PB |
3000 | if (req->flags & REQ_F_NEED_CLEANUP) |
3001 | return 0; | |
03b1230c | 3002 | |
15b71abe | 3003 | req->open.dfd = READ_ONCE(sqe->fd); |
c12cedf2 | 3004 | req->open.how.mode = READ_ONCE(sqe->len); |
f8748881 | 3005 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
c12cedf2 | 3006 | req->open.how.flags = READ_ONCE(sqe->open_flags); |
08a1d26e JA |
3007 | if (force_o_largefile()) |
3008 | req->open.how.flags |= O_LARGEFILE; | |
3529d8c2 | 3009 | |
f8748881 | 3010 | req->open.filename = getname(fname); |
15b71abe JA |
3011 | if (IS_ERR(req->open.filename)) { |
3012 | ret = PTR_ERR(req->open.filename); | |
3013 | req->open.filename = NULL; | |
3014 | return ret; | |
3015 | } | |
3529d8c2 | 3016 | |
4022e7af | 3017 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3018 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3019 | return 0; |
03b1230c JA |
3020 | } |
3021 | ||
cebdb986 | 3022 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3023 | { |
cebdb986 JA |
3024 | struct open_how __user *how; |
3025 | const char __user *fname; | |
3026 | size_t len; | |
0fa03c62 JA |
3027 | int ret; |
3028 | ||
cebdb986 | 3029 | if (sqe->ioprio || sqe->buf_index) |
0fa03c62 | 3030 | return -EINVAL; |
9c280f90 | 3031 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3032 | return -EBADF; |
0bdbdd08 PB |
3033 | if (req->flags & REQ_F_NEED_CLEANUP) |
3034 | return 0; | |
0fa03c62 | 3035 | |
cebdb986 JA |
3036 | req->open.dfd = READ_ONCE(sqe->fd); |
3037 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3038 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3039 | len = READ_ONCE(sqe->len); | |
0fa03c62 | 3040 | |
cebdb986 JA |
3041 | if (len < OPEN_HOW_SIZE_VER0) |
3042 | return -EINVAL; | |
3529d8c2 | 3043 | |
cebdb986 JA |
3044 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3045 | len); | |
3046 | if (ret) | |
3047 | return ret; | |
3529d8c2 | 3048 | |
cebdb986 JA |
3049 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) |
3050 | req->open.how.flags |= O_LARGEFILE; | |
0fa03c62 | 3051 | |
cebdb986 JA |
3052 | req->open.filename = getname(fname); |
3053 | if (IS_ERR(req->open.filename)) { | |
3054 | ret = PTR_ERR(req->open.filename); | |
3055 | req->open.filename = NULL; | |
3056 | return ret; | |
3057 | } | |
3058 | ||
4022e7af | 3059 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3060 | req->flags |= REQ_F_NEED_CLEANUP; |
cebdb986 JA |
3061 | return 0; |
3062 | } | |
3063 | ||
014db007 | 3064 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3065 | { |
3066 | struct open_flags op; | |
15b71abe JA |
3067 | struct file *file; |
3068 | int ret; | |
3069 | ||
f86cd20c | 3070 | if (force_nonblock) |
15b71abe | 3071 | return -EAGAIN; |
15b71abe | 3072 | |
cebdb986 | 3073 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3074 | if (ret) |
3075 | goto err; | |
3076 | ||
4022e7af | 3077 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3078 | if (ret < 0) |
3079 | goto err; | |
3080 | ||
3081 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3082 | if (IS_ERR(file)) { | |
3083 | put_unused_fd(ret); | |
3084 | ret = PTR_ERR(file); | |
3085 | } else { | |
3086 | fsnotify_open(file); | |
3087 | fd_install(ret, file); | |
3088 | } | |
3089 | err: | |
3090 | putname(req->open.filename); | |
8fef80bf | 3091 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3092 | if (ret < 0) |
3093 | req_set_fail_links(req); | |
3094 | io_cqring_add_event(req, ret); | |
014db007 | 3095 | io_put_req(req); |
15b71abe JA |
3096 | return 0; |
3097 | } | |
3098 | ||
014db007 | 3099 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 JA |
3100 | { |
3101 | req->open.how = build_open_how(req->open.how.flags, req->open.how.mode); | |
014db007 | 3102 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3103 | } |
3104 | ||
067524e9 JA |
3105 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3106 | const struct io_uring_sqe *sqe) | |
3107 | { | |
3108 | struct io_provide_buf *p = &req->pbuf; | |
3109 | u64 tmp; | |
3110 | ||
3111 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3112 | return -EINVAL; | |
3113 | ||
3114 | tmp = READ_ONCE(sqe->fd); | |
3115 | if (!tmp || tmp > USHRT_MAX) | |
3116 | return -EINVAL; | |
3117 | ||
3118 | memset(p, 0, sizeof(*p)); | |
3119 | p->nbufs = tmp; | |
3120 | p->bgid = READ_ONCE(sqe->buf_group); | |
3121 | return 0; | |
3122 | } | |
3123 | ||
3124 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3125 | int bgid, unsigned nbufs) | |
3126 | { | |
3127 | unsigned i = 0; | |
3128 | ||
3129 | /* shouldn't happen */ | |
3130 | if (!nbufs) | |
3131 | return 0; | |
3132 | ||
3133 | /* the head kbuf is the list itself */ | |
3134 | while (!list_empty(&buf->list)) { | |
3135 | struct io_buffer *nxt; | |
3136 | ||
3137 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3138 | list_del(&nxt->list); | |
3139 | kfree(nxt); | |
3140 | if (++i == nbufs) | |
3141 | return i; | |
3142 | } | |
3143 | i++; | |
3144 | kfree(buf); | |
3145 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3146 | ||
3147 | return i; | |
3148 | } | |
3149 | ||
3150 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock) | |
3151 | { | |
3152 | struct io_provide_buf *p = &req->pbuf; | |
3153 | struct io_ring_ctx *ctx = req->ctx; | |
3154 | struct io_buffer *head; | |
3155 | int ret = 0; | |
3156 | ||
3157 | io_ring_submit_lock(ctx, !force_nonblock); | |
3158 | ||
3159 | lockdep_assert_held(&ctx->uring_lock); | |
3160 | ||
3161 | ret = -ENOENT; | |
3162 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3163 | if (head) | |
3164 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3165 | ||
3166 | io_ring_submit_lock(ctx, !force_nonblock); | |
3167 | if (ret < 0) | |
3168 | req_set_fail_links(req); | |
3169 | io_cqring_add_event(req, ret); | |
3170 | io_put_req(req); | |
3171 | return 0; | |
3172 | } | |
3173 | ||
ddf0322d JA |
3174 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3175 | const struct io_uring_sqe *sqe) | |
3176 | { | |
3177 | struct io_provide_buf *p = &req->pbuf; | |
3178 | u64 tmp; | |
3179 | ||
3180 | if (sqe->ioprio || sqe->rw_flags) | |
3181 | return -EINVAL; | |
3182 | ||
3183 | tmp = READ_ONCE(sqe->fd); | |
3184 | if (!tmp || tmp > USHRT_MAX) | |
3185 | return -E2BIG; | |
3186 | p->nbufs = tmp; | |
3187 | p->addr = READ_ONCE(sqe->addr); | |
3188 | p->len = READ_ONCE(sqe->len); | |
3189 | ||
3190 | if (!access_ok(u64_to_user_ptr(p->addr), p->len)) | |
3191 | return -EFAULT; | |
3192 | ||
3193 | p->bgid = READ_ONCE(sqe->buf_group); | |
3194 | tmp = READ_ONCE(sqe->off); | |
3195 | if (tmp > USHRT_MAX) | |
3196 | return -E2BIG; | |
3197 | p->bid = tmp; | |
3198 | return 0; | |
3199 | } | |
3200 | ||
3201 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3202 | { | |
3203 | struct io_buffer *buf; | |
3204 | u64 addr = pbuf->addr; | |
3205 | int i, bid = pbuf->bid; | |
3206 | ||
3207 | for (i = 0; i < pbuf->nbufs; i++) { | |
3208 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3209 | if (!buf) | |
3210 | break; | |
3211 | ||
3212 | buf->addr = addr; | |
3213 | buf->len = pbuf->len; | |
3214 | buf->bid = bid; | |
3215 | addr += pbuf->len; | |
3216 | bid++; | |
3217 | if (!*head) { | |
3218 | INIT_LIST_HEAD(&buf->list); | |
3219 | *head = buf; | |
3220 | } else { | |
3221 | list_add_tail(&buf->list, &(*head)->list); | |
3222 | } | |
3223 | } | |
3224 | ||
3225 | return i ? i : -ENOMEM; | |
3226 | } | |
3227 | ||
ddf0322d JA |
3228 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock) |
3229 | { | |
3230 | struct io_provide_buf *p = &req->pbuf; | |
3231 | struct io_ring_ctx *ctx = req->ctx; | |
3232 | struct io_buffer *head, *list; | |
3233 | int ret = 0; | |
3234 | ||
3235 | io_ring_submit_lock(ctx, !force_nonblock); | |
3236 | ||
3237 | lockdep_assert_held(&ctx->uring_lock); | |
3238 | ||
3239 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3240 | ||
3241 | ret = io_add_buffers(p, &head); | |
3242 | if (ret < 0) | |
3243 | goto out; | |
3244 | ||
3245 | if (!list) { | |
3246 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3247 | GFP_KERNEL); | |
3248 | if (ret < 0) { | |
067524e9 | 3249 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3250 | goto out; |
3251 | } | |
3252 | } | |
3253 | out: | |
3254 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3255 | if (ret < 0) | |
3256 | req_set_fail_links(req); | |
3257 | io_cqring_add_event(req, ret); | |
3258 | io_put_req(req); | |
3259 | return 0; | |
cebdb986 JA |
3260 | } |
3261 | ||
3e4827b0 JA |
3262 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3263 | const struct io_uring_sqe *sqe) | |
3264 | { | |
3265 | #if defined(CONFIG_EPOLL) | |
3266 | if (sqe->ioprio || sqe->buf_index) | |
3267 | return -EINVAL; | |
3268 | ||
3269 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3270 | req->epoll.op = READ_ONCE(sqe->len); | |
3271 | req->epoll.fd = READ_ONCE(sqe->off); | |
3272 | ||
3273 | if (ep_op_has_event(req->epoll.op)) { | |
3274 | struct epoll_event __user *ev; | |
3275 | ||
3276 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3277 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3278 | return -EFAULT; | |
3279 | } | |
3280 | ||
3281 | return 0; | |
3282 | #else | |
3283 | return -EOPNOTSUPP; | |
3284 | #endif | |
3285 | } | |
3286 | ||
014db007 | 3287 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock) |
3e4827b0 JA |
3288 | { |
3289 | #if defined(CONFIG_EPOLL) | |
3290 | struct io_epoll *ie = &req->epoll; | |
3291 | int ret; | |
3292 | ||
3293 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3294 | if (force_nonblock && ret == -EAGAIN) | |
3295 | return -EAGAIN; | |
3296 | ||
3297 | if (ret < 0) | |
3298 | req_set_fail_links(req); | |
3299 | io_cqring_add_event(req, ret); | |
014db007 | 3300 | io_put_req(req); |
3e4827b0 JA |
3301 | return 0; |
3302 | #else | |
3303 | return -EOPNOTSUPP; | |
3304 | #endif | |
3305 | } | |
3306 | ||
c1ca757b JA |
3307 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3308 | { | |
3309 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3310 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3311 | return -EINVAL; | |
3312 | ||
3313 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3314 | req->madvise.len = READ_ONCE(sqe->len); | |
3315 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3316 | return 0; | |
3317 | #else | |
3318 | return -EOPNOTSUPP; | |
3319 | #endif | |
3320 | } | |
3321 | ||
014db007 | 3322 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3323 | { |
3324 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3325 | struct io_madvise *ma = &req->madvise; | |
3326 | int ret; | |
3327 | ||
3328 | if (force_nonblock) | |
3329 | return -EAGAIN; | |
3330 | ||
3331 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3332 | if (ret < 0) | |
3333 | req_set_fail_links(req); | |
3334 | io_cqring_add_event(req, ret); | |
014db007 | 3335 | io_put_req(req); |
c1ca757b JA |
3336 | return 0; |
3337 | #else | |
3338 | return -EOPNOTSUPP; | |
3339 | #endif | |
3340 | } | |
3341 | ||
4840e418 JA |
3342 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3343 | { | |
3344 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3345 | return -EINVAL; | |
3346 | ||
3347 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3348 | req->fadvise.len = READ_ONCE(sqe->len); | |
3349 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3350 | return 0; | |
3351 | } | |
3352 | ||
014db007 | 3353 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3354 | { |
3355 | struct io_fadvise *fa = &req->fadvise; | |
3356 | int ret; | |
3357 | ||
3e69426d JA |
3358 | if (force_nonblock) { |
3359 | switch (fa->advice) { | |
3360 | case POSIX_FADV_NORMAL: | |
3361 | case POSIX_FADV_RANDOM: | |
3362 | case POSIX_FADV_SEQUENTIAL: | |
3363 | break; | |
3364 | default: | |
3365 | return -EAGAIN; | |
3366 | } | |
3367 | } | |
4840e418 JA |
3368 | |
3369 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3370 | if (ret < 0) | |
3371 | req_set_fail_links(req); | |
3372 | io_cqring_add_event(req, ret); | |
014db007 | 3373 | io_put_req(req); |
4840e418 JA |
3374 | return 0; |
3375 | } | |
3376 | ||
eddc7ef5 JA |
3377 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3378 | { | |
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 | 3389 | |
eddc7ef5 JA |
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 | |
3419 | * leave the 'file' in an undeterminate state. | |
3420 | */ | |
3421 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; | |
3422 | ||
3423 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || | |
3424 | sqe->rw_flags || sqe->buf_index) | |
3425 | return -EINVAL; | |
9c280f90 | 3426 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3427 | return -EBADF; |
b5dba59e JA |
3428 | |
3429 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e JA |
3430 | return 0; |
3431 | } | |
3432 | ||
a93b3331 | 3433 | /* only called when __close_fd_get_file() is done */ |
014db007 | 3434 | static void __io_close_finish(struct io_kiocb *req) |
a93b3331 PB |
3435 | { |
3436 | int ret; | |
3437 | ||
3438 | ret = filp_close(req->close.put_file, req->work.files); | |
3439 | if (ret < 0) | |
3440 | req_set_fail_links(req); | |
3441 | io_cqring_add_event(req, ret); | |
3442 | fput(req->close.put_file); | |
014db007 | 3443 | io_put_req(req); |
a93b3331 PB |
3444 | } |
3445 | ||
b5dba59e JA |
3446 | static void io_close_finish(struct io_wq_work **workptr) |
3447 | { | |
3448 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
b5dba59e | 3449 | |
7fbeb95d | 3450 | /* not cancellable, don't do io_req_cancelled() */ |
014db007 | 3451 | __io_close_finish(req); |
e9fd9396 | 3452 | io_steal_work(req, workptr); |
b5dba59e JA |
3453 | } |
3454 | ||
014db007 | 3455 | static int io_close(struct io_kiocb *req, bool force_nonblock) |
b5dba59e JA |
3456 | { |
3457 | int ret; | |
3458 | ||
3459 | req->close.put_file = NULL; | |
3460 | ret = __close_fd_get_file(req->close.fd, &req->close.put_file); | |
0bf0eefd PB |
3461 | if (ret < 0) |
3462 | return (ret == -ENOENT) ? -EBADF : ret; | |
b5dba59e JA |
3463 | |
3464 | /* if the file has a flush method, be safe and punt to async */ | |
a2100672 | 3465 | if (req->close.put_file->f_op->flush && force_nonblock) { |
0bf0eefd PB |
3466 | /* avoid grabbing files - we don't need the files */ |
3467 | req->flags |= REQ_F_NO_FILE_TABLE | REQ_F_MUST_PUNT; | |
a2100672 | 3468 | req->work.func = io_close_finish; |
0bf0eefd | 3469 | return -EAGAIN; |
a2100672 | 3470 | } |
b5dba59e JA |
3471 | |
3472 | /* | |
3473 | * No ->flush(), safely close from here and just punt the | |
3474 | * fput() to async context. | |
3475 | */ | |
014db007 | 3476 | __io_close_finish(req); |
1a417f4e | 3477 | return 0; |
b5dba59e JA |
3478 | } |
3479 | ||
3529d8c2 | 3480 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3481 | { |
3482 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3483 | |
3484 | if (!req->file) | |
3485 | return -EBADF; | |
5d17b4a4 JA |
3486 | |
3487 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3488 | return -EINVAL; | |
3489 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3490 | return -EINVAL; | |
3491 | ||
8ed8d3c3 JA |
3492 | req->sync.off = READ_ONCE(sqe->off); |
3493 | req->sync.len = READ_ONCE(sqe->len); | |
3494 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3495 | return 0; |
3496 | } | |
3497 | ||
014db007 | 3498 | static void __io_sync_file_range(struct io_kiocb *req) |
8ed8d3c3 | 3499 | { |
8ed8d3c3 JA |
3500 | int ret; |
3501 | ||
9adbd45d | 3502 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3503 | req->sync.flags); |
3504 | if (ret < 0) | |
3505 | req_set_fail_links(req); | |
3506 | io_cqring_add_event(req, ret); | |
014db007 | 3507 | io_put_req(req); |
5ea62161 PB |
3508 | } |
3509 | ||
3510 | ||
3511 | static void io_sync_file_range_finish(struct io_wq_work **workptr) | |
3512 | { | |
3513 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
5ea62161 PB |
3514 | |
3515 | if (io_req_cancelled(req)) | |
3516 | return; | |
014db007 | 3517 | __io_sync_file_range(req); |
7759a0bf | 3518 | io_steal_work(req, workptr); |
5d17b4a4 JA |
3519 | } |
3520 | ||
014db007 | 3521 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3522 | { |
5d17b4a4 | 3523 | /* sync_file_range always requires a blocking context */ |
8ed8d3c3 | 3524 | if (force_nonblock) { |
8ed8d3c3 | 3525 | req->work.func = io_sync_file_range_finish; |
5d17b4a4 | 3526 | return -EAGAIN; |
8ed8d3c3 | 3527 | } |
5d17b4a4 | 3528 | |
014db007 | 3529 | __io_sync_file_range(req); |
5d17b4a4 JA |
3530 | return 0; |
3531 | } | |
3532 | ||
469956e8 | 3533 | #if defined(CONFIG_NET) |
02d27d89 PB |
3534 | static int io_setup_async_msg(struct io_kiocb *req, |
3535 | struct io_async_msghdr *kmsg) | |
3536 | { | |
3537 | if (req->io) | |
3538 | return -EAGAIN; | |
3539 | if (io_alloc_async_ctx(req)) { | |
3540 | if (kmsg->iov != kmsg->fast_iov) | |
3541 | kfree(kmsg->iov); | |
3542 | return -ENOMEM; | |
3543 | } | |
3544 | req->flags |= REQ_F_NEED_CLEANUP; | |
3545 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
3546 | return -EAGAIN; | |
3547 | } | |
3548 | ||
3529d8c2 | 3549 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 3550 | { |
e47293fd | 3551 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3552 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3553 | int ret; |
03b1230c | 3554 | |
e47293fd JA |
3555 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3556 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
fddaface | 3557 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 3558 | |
d8768362 JA |
3559 | #ifdef CONFIG_COMPAT |
3560 | if (req->ctx->compat) | |
3561 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3562 | #endif | |
3563 | ||
fddaface | 3564 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 3565 | return 0; |
5f798bea PB |
3566 | /* iovec is already imported */ |
3567 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3568 | return 0; | |
3529d8c2 | 3569 | |
d9688565 | 3570 | io->msg.iov = io->msg.fast_iov; |
99bc4c38 | 3571 | ret = sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags, |
e47293fd | 3572 | &io->msg.iov); |
99bc4c38 PB |
3573 | if (!ret) |
3574 | req->flags |= REQ_F_NEED_CLEANUP; | |
3575 | return ret; | |
03b1230c JA |
3576 | } |
3577 | ||
014db007 | 3578 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3579 | { |
0b416c3e | 3580 | struct io_async_msghdr *kmsg = NULL; |
0fa03c62 JA |
3581 | struct socket *sock; |
3582 | int ret; | |
3583 | ||
3584 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3585 | return -EINVAL; | |
3586 | ||
3587 | sock = sock_from_file(req->file, &ret); | |
3588 | if (sock) { | |
b7bb4f7d | 3589 | struct io_async_ctx io; |
0fa03c62 JA |
3590 | unsigned flags; |
3591 | ||
03b1230c | 3592 | if (req->io) { |
0b416c3e | 3593 | kmsg = &req->io->msg; |
b537916c | 3594 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3595 | /* if iov is set, it's allocated already */ |
3596 | if (!kmsg->iov) | |
3597 | kmsg->iov = kmsg->fast_iov; | |
3598 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3599 | } else { |
3529d8c2 JA |
3600 | struct io_sr_msg *sr = &req->sr_msg; |
3601 | ||
0b416c3e | 3602 | kmsg = &io.msg; |
b537916c | 3603 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 JA |
3604 | |
3605 | io.msg.iov = io.msg.fast_iov; | |
3606 | ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg, | |
3607 | sr->msg_flags, &io.msg.iov); | |
03b1230c | 3608 | if (ret) |
3529d8c2 | 3609 | return ret; |
03b1230c | 3610 | } |
0fa03c62 | 3611 | |
e47293fd JA |
3612 | flags = req->sr_msg.msg_flags; |
3613 | if (flags & MSG_DONTWAIT) | |
3614 | req->flags |= REQ_F_NOWAIT; | |
3615 | else if (force_nonblock) | |
3616 | flags |= MSG_DONTWAIT; | |
3617 | ||
0b416c3e | 3618 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
02d27d89 PB |
3619 | if (force_nonblock && ret == -EAGAIN) |
3620 | return io_setup_async_msg(req, kmsg); | |
441cdbd5 JA |
3621 | if (ret == -ERESTARTSYS) |
3622 | ret = -EINTR; | |
0fa03c62 JA |
3623 | } |
3624 | ||
1e95081c | 3625 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3626 | kfree(kmsg->iov); |
99bc4c38 | 3627 | req->flags &= ~REQ_F_NEED_CLEANUP; |
78e19bbe | 3628 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
3629 | if (ret < 0) |
3630 | req_set_fail_links(req); | |
014db007 | 3631 | io_put_req(req); |
5d17b4a4 | 3632 | return 0; |
03b1230c | 3633 | } |
aa1fa28f | 3634 | |
014db007 | 3635 | static int io_send(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3636 | { |
fddaface JA |
3637 | struct socket *sock; |
3638 | int ret; | |
3639 | ||
3640 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3641 | return -EINVAL; | |
3642 | ||
3643 | sock = sock_from_file(req->file, &ret); | |
3644 | if (sock) { | |
3645 | struct io_sr_msg *sr = &req->sr_msg; | |
3646 | struct msghdr msg; | |
3647 | struct iovec iov; | |
3648 | unsigned flags; | |
3649 | ||
3650 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, | |
3651 | &msg.msg_iter); | |
3652 | if (ret) | |
3653 | return ret; | |
3654 | ||
3655 | msg.msg_name = NULL; | |
3656 | msg.msg_control = NULL; | |
3657 | msg.msg_controllen = 0; | |
3658 | msg.msg_namelen = 0; | |
3659 | ||
3660 | flags = req->sr_msg.msg_flags; | |
3661 | if (flags & MSG_DONTWAIT) | |
3662 | req->flags |= REQ_F_NOWAIT; | |
3663 | else if (force_nonblock) | |
3664 | flags |= MSG_DONTWAIT; | |
3665 | ||
0b7b21e4 JA |
3666 | msg.msg_flags = flags; |
3667 | ret = sock_sendmsg(sock, &msg); | |
fddaface JA |
3668 | if (force_nonblock && ret == -EAGAIN) |
3669 | return -EAGAIN; | |
3670 | if (ret == -ERESTARTSYS) | |
3671 | ret = -EINTR; | |
3672 | } | |
3673 | ||
3674 | io_cqring_add_event(req, ret); | |
3675 | if (ret < 0) | |
3676 | req_set_fail_links(req); | |
014db007 | 3677 | io_put_req(req); |
fddaface | 3678 | return 0; |
fddaface JA |
3679 | } |
3680 | ||
52de1fe1 JA |
3681 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) |
3682 | { | |
3683 | struct io_sr_msg *sr = &req->sr_msg; | |
3684 | struct iovec __user *uiov; | |
3685 | size_t iov_len; | |
3686 | int ret; | |
3687 | ||
3688 | ret = __copy_msghdr_from_user(&io->msg.msg, sr->msg, &io->msg.uaddr, | |
3689 | &uiov, &iov_len); | |
3690 | if (ret) | |
3691 | return ret; | |
3692 | ||
3693 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3694 | if (iov_len > 1) | |
3695 | return -EINVAL; | |
3696 | if (copy_from_user(io->msg.iov, uiov, sizeof(*uiov))) | |
3697 | return -EFAULT; | |
3698 | sr->len = io->msg.iov[0].iov_len; | |
3699 | iov_iter_init(&io->msg.msg.msg_iter, READ, io->msg.iov, 1, | |
3700 | sr->len); | |
3701 | io->msg.iov = NULL; | |
3702 | } else { | |
3703 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
3704 | &io->msg.iov, &io->msg.msg.msg_iter); | |
3705 | if (ret > 0) | |
3706 | ret = 0; | |
3707 | } | |
3708 | ||
3709 | return ret; | |
3710 | } | |
3711 | ||
3712 | #ifdef CONFIG_COMPAT | |
3713 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
3714 | struct io_async_ctx *io) | |
3715 | { | |
3716 | struct compat_msghdr __user *msg_compat; | |
3717 | struct io_sr_msg *sr = &req->sr_msg; | |
3718 | struct compat_iovec __user *uiov; | |
3719 | compat_uptr_t ptr; | |
3720 | compat_size_t len; | |
3721 | int ret; | |
3722 | ||
3723 | msg_compat = (struct compat_msghdr __user *) sr->msg; | |
3724 | ret = __get_compat_msghdr(&io->msg.msg, msg_compat, &io->msg.uaddr, | |
3725 | &ptr, &len); | |
3726 | if (ret) | |
3727 | return ret; | |
3728 | ||
3729 | uiov = compat_ptr(ptr); | |
3730 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3731 | compat_ssize_t clen; | |
3732 | ||
3733 | if (len > 1) | |
3734 | return -EINVAL; | |
3735 | if (!access_ok(uiov, sizeof(*uiov))) | |
3736 | return -EFAULT; | |
3737 | if (__get_user(clen, &uiov->iov_len)) | |
3738 | return -EFAULT; | |
3739 | if (clen < 0) | |
3740 | return -EINVAL; | |
3741 | sr->len = io->msg.iov[0].iov_len; | |
3742 | io->msg.iov = NULL; | |
3743 | } else { | |
3744 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
3745 | &io->msg.iov, | |
3746 | &io->msg.msg.msg_iter); | |
3747 | if (ret < 0) | |
3748 | return ret; | |
3749 | } | |
3750 | ||
3751 | return 0; | |
3752 | } | |
3753 | #endif | |
3754 | ||
3755 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) | |
3756 | { | |
3757 | io->msg.iov = io->msg.fast_iov; | |
3758 | ||
3759 | #ifdef CONFIG_COMPAT | |
3760 | if (req->ctx->compat) | |
3761 | return __io_compat_recvmsg_copy_hdr(req, io); | |
fddaface | 3762 | #endif |
52de1fe1 JA |
3763 | |
3764 | return __io_recvmsg_copy_hdr(req, io); | |
3765 | } | |
3766 | ||
bcda7baa JA |
3767 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
3768 | int *cflags, bool needs_lock) | |
3769 | { | |
3770 | struct io_sr_msg *sr = &req->sr_msg; | |
3771 | struct io_buffer *kbuf; | |
3772 | ||
3773 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
3774 | return NULL; | |
3775 | ||
3776 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); | |
3777 | if (IS_ERR(kbuf)) | |
3778 | return kbuf; | |
3779 | ||
3780 | sr->kbuf = kbuf; | |
3781 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3782 | ||
3783 | *cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
3784 | *cflags |= IORING_CQE_F_BUFFER; | |
3785 | return kbuf; | |
fddaface JA |
3786 | } |
3787 | ||
3529d8c2 JA |
3788 | static int io_recvmsg_prep(struct io_kiocb *req, |
3789 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 3790 | { |
e47293fd | 3791 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3792 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3793 | int ret; |
3529d8c2 JA |
3794 | |
3795 | sr->msg_flags = READ_ONCE(sqe->msg_flags); | |
3796 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
0b7b21e4 | 3797 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 3798 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 3799 | |
d8768362 JA |
3800 | #ifdef CONFIG_COMPAT |
3801 | if (req->ctx->compat) | |
3802 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3803 | #endif | |
3804 | ||
fddaface | 3805 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 3806 | return 0; |
5f798bea PB |
3807 | /* iovec is already imported */ |
3808 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3809 | return 0; | |
03b1230c | 3810 | |
52de1fe1 | 3811 | ret = io_recvmsg_copy_hdr(req, io); |
99bc4c38 PB |
3812 | if (!ret) |
3813 | req->flags |= REQ_F_NEED_CLEANUP; | |
3814 | return ret; | |
aa1fa28f JA |
3815 | } |
3816 | ||
014db007 | 3817 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3818 | { |
0b416c3e | 3819 | struct io_async_msghdr *kmsg = NULL; |
03b1230c | 3820 | struct socket *sock; |
52de1fe1 | 3821 | int ret, cflags = 0; |
03b1230c JA |
3822 | |
3823 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3824 | return -EINVAL; | |
3825 | ||
3826 | sock = sock_from_file(req->file, &ret); | |
3827 | if (sock) { | |
52de1fe1 | 3828 | struct io_buffer *kbuf; |
b7bb4f7d | 3829 | struct io_async_ctx io; |
03b1230c JA |
3830 | unsigned flags; |
3831 | ||
03b1230c | 3832 | if (req->io) { |
0b416c3e | 3833 | kmsg = &req->io->msg; |
b537916c | 3834 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3835 | /* if iov is set, it's allocated already */ |
3836 | if (!kmsg->iov) | |
3837 | kmsg->iov = kmsg->fast_iov; | |
3838 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3839 | } else { |
0b416c3e | 3840 | kmsg = &io.msg; |
b537916c | 3841 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 | 3842 | |
52de1fe1 | 3843 | ret = io_recvmsg_copy_hdr(req, &io); |
03b1230c | 3844 | if (ret) |
3529d8c2 | 3845 | return ret; |
03b1230c JA |
3846 | } |
3847 | ||
52de1fe1 JA |
3848 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3849 | if (IS_ERR(kbuf)) { | |
3850 | return PTR_ERR(kbuf); | |
3851 | } else if (kbuf) { | |
3852 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3853 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
3854 | 1, req->sr_msg.len); | |
3855 | } | |
3856 | ||
e47293fd JA |
3857 | flags = req->sr_msg.msg_flags; |
3858 | if (flags & MSG_DONTWAIT) | |
3859 | req->flags |= REQ_F_NOWAIT; | |
3860 | else if (force_nonblock) | |
3861 | flags |= MSG_DONTWAIT; | |
3862 | ||
3863 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg, | |
3864 | kmsg->uaddr, flags); | |
02d27d89 PB |
3865 | if (force_nonblock && ret == -EAGAIN) |
3866 | return io_setup_async_msg(req, kmsg); | |
03b1230c JA |
3867 | if (ret == -ERESTARTSYS) |
3868 | ret = -EINTR; | |
3869 | } | |
3870 | ||
1e95081c | 3871 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3872 | kfree(kmsg->iov); |
99bc4c38 | 3873 | req->flags &= ~REQ_F_NEED_CLEANUP; |
52de1fe1 | 3874 | __io_cqring_add_event(req, ret, cflags); |
4e88d6e7 JA |
3875 | if (ret < 0) |
3876 | req_set_fail_links(req); | |
014db007 | 3877 | io_put_req(req); |
03b1230c | 3878 | return 0; |
0fa03c62 | 3879 | } |
5d17b4a4 | 3880 | |
014db007 | 3881 | static int io_recv(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3882 | { |
bcda7baa | 3883 | struct io_buffer *kbuf = NULL; |
fddaface | 3884 | struct socket *sock; |
bcda7baa | 3885 | int ret, cflags = 0; |
fddaface JA |
3886 | |
3887 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3888 | return -EINVAL; | |
3889 | ||
3890 | sock = sock_from_file(req->file, &ret); | |
3891 | if (sock) { | |
3892 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 3893 | void __user *buf = sr->buf; |
fddaface JA |
3894 | struct msghdr msg; |
3895 | struct iovec iov; | |
3896 | unsigned flags; | |
3897 | ||
bcda7baa JA |
3898 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3899 | if (IS_ERR(kbuf)) | |
3900 | return PTR_ERR(kbuf); | |
3901 | else if (kbuf) | |
3902 | buf = u64_to_user_ptr(kbuf->addr); | |
3903 | ||
3904 | ret = import_single_range(READ, buf, sr->len, &iov, | |
fddaface | 3905 | &msg.msg_iter); |
bcda7baa JA |
3906 | if (ret) { |
3907 | kfree(kbuf); | |
fddaface | 3908 | return ret; |
bcda7baa | 3909 | } |
fddaface | 3910 | |
bcda7baa | 3911 | req->flags |= REQ_F_NEED_CLEANUP; |
fddaface JA |
3912 | msg.msg_name = NULL; |
3913 | msg.msg_control = NULL; | |
3914 | msg.msg_controllen = 0; | |
3915 | msg.msg_namelen = 0; | |
3916 | msg.msg_iocb = NULL; | |
3917 | msg.msg_flags = 0; | |
3918 | ||
3919 | flags = req->sr_msg.msg_flags; | |
3920 | if (flags & MSG_DONTWAIT) | |
3921 | req->flags |= REQ_F_NOWAIT; | |
3922 | else if (force_nonblock) | |
3923 | flags |= MSG_DONTWAIT; | |
3924 | ||
0b7b21e4 | 3925 | ret = sock_recvmsg(sock, &msg, flags); |
fddaface JA |
3926 | if (force_nonblock && ret == -EAGAIN) |
3927 | return -EAGAIN; | |
3928 | if (ret == -ERESTARTSYS) | |
3929 | ret = -EINTR; | |
3930 | } | |
3931 | ||
bcda7baa JA |
3932 | kfree(kbuf); |
3933 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3934 | __io_cqring_add_event(req, ret, cflags); | |
fddaface JA |
3935 | if (ret < 0) |
3936 | req_set_fail_links(req); | |
014db007 | 3937 | io_put_req(req); |
fddaface | 3938 | return 0; |
fddaface JA |
3939 | } |
3940 | ||
3529d8c2 | 3941 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 3942 | { |
8ed8d3c3 JA |
3943 | struct io_accept *accept = &req->accept; |
3944 | ||
17f2fe35 JA |
3945 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3946 | return -EINVAL; | |
8042d6ce | 3947 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
3948 | return -EINVAL; |
3949 | ||
d55e5f5b JA |
3950 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
3951 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 3952 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 3953 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 3954 | return 0; |
8ed8d3c3 | 3955 | } |
17f2fe35 | 3956 | |
014db007 | 3957 | static int __io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 JA |
3958 | { |
3959 | struct io_accept *accept = &req->accept; | |
3960 | unsigned file_flags; | |
3961 | int ret; | |
3962 | ||
3963 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
3964 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, | |
09952e3e JA |
3965 | accept->addr_len, accept->flags, |
3966 | accept->nofile); | |
8ed8d3c3 | 3967 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 3968 | return -EAGAIN; |
8e3cca12 JA |
3969 | if (ret == -ERESTARTSYS) |
3970 | ret = -EINTR; | |
4e88d6e7 JA |
3971 | if (ret < 0) |
3972 | req_set_fail_links(req); | |
78e19bbe | 3973 | io_cqring_add_event(req, ret); |
014db007 | 3974 | io_put_req(req); |
17f2fe35 | 3975 | return 0; |
8ed8d3c3 JA |
3976 | } |
3977 | ||
3978 | static void io_accept_finish(struct io_wq_work **workptr) | |
3979 | { | |
3980 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
8ed8d3c3 JA |
3981 | |
3982 | if (io_req_cancelled(req)) | |
3983 | return; | |
014db007 | 3984 | __io_accept(req, false); |
e9fd9396 | 3985 | io_steal_work(req, workptr); |
8ed8d3c3 | 3986 | } |
8ed8d3c3 | 3987 | |
014db007 | 3988 | static int io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3989 | { |
8ed8d3c3 JA |
3990 | int ret; |
3991 | ||
014db007 | 3992 | ret = __io_accept(req, force_nonblock); |
8ed8d3c3 JA |
3993 | if (ret == -EAGAIN && force_nonblock) { |
3994 | req->work.func = io_accept_finish; | |
8ed8d3c3 JA |
3995 | return -EAGAIN; |
3996 | } | |
3997 | return 0; | |
0fa03c62 | 3998 | } |
5d17b4a4 | 3999 | |
3529d8c2 | 4000 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4001 | { |
3529d8c2 JA |
4002 | struct io_connect *conn = &req->connect; |
4003 | struct io_async_ctx *io = req->io; | |
f499a021 | 4004 | |
3fbb51c1 JA |
4005 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4006 | return -EINVAL; | |
4007 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4008 | return -EINVAL; | |
4009 | ||
3529d8c2 JA |
4010 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4011 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4012 | ||
4013 | if (!io) | |
4014 | return 0; | |
4015 | ||
4016 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4017 | &io->connect.address); |
f499a021 JA |
4018 | } |
4019 | ||
014db007 | 4020 | static int io_connect(struct io_kiocb *req, bool force_nonblock) |
f8e85cf2 | 4021 | { |
f499a021 | 4022 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4023 | unsigned file_flags; |
3fbb51c1 | 4024 | int ret; |
f8e85cf2 | 4025 | |
f499a021 JA |
4026 | if (req->io) { |
4027 | io = req->io; | |
4028 | } else { | |
3529d8c2 JA |
4029 | ret = move_addr_to_kernel(req->connect.addr, |
4030 | req->connect.addr_len, | |
4031 | &__io.connect.address); | |
f499a021 JA |
4032 | if (ret) |
4033 | goto out; | |
4034 | io = &__io; | |
4035 | } | |
4036 | ||
3fbb51c1 JA |
4037 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4038 | ||
4039 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4040 | req->connect.addr_len, file_flags); | |
87f80d62 | 4041 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4042 | if (req->io) |
4043 | return -EAGAIN; | |
4044 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4045 | ret = -ENOMEM; |
4046 | goto out; | |
4047 | } | |
b7bb4f7d | 4048 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4049 | return -EAGAIN; |
f499a021 | 4050 | } |
f8e85cf2 JA |
4051 | if (ret == -ERESTARTSYS) |
4052 | ret = -EINTR; | |
f499a021 | 4053 | out: |
4e88d6e7 JA |
4054 | if (ret < 0) |
4055 | req_set_fail_links(req); | |
f8e85cf2 | 4056 | io_cqring_add_event(req, ret); |
014db007 | 4057 | io_put_req(req); |
f8e85cf2 | 4058 | return 0; |
469956e8 Y |
4059 | } |
4060 | #else /* !CONFIG_NET */ | |
4061 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4062 | { | |
f8e85cf2 | 4063 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4064 | } |
4065 | ||
469956e8 Y |
4066 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
4067 | { | |
4068 | return -EOPNOTSUPP; | |
4069 | } | |
4070 | ||
4071 | static int io_send(struct io_kiocb *req, bool force_nonblock) | |
4072 | { | |
4073 | return -EOPNOTSUPP; | |
4074 | } | |
4075 | ||
4076 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4077 | const struct io_uring_sqe *sqe) | |
4078 | { | |
4079 | return -EOPNOTSUPP; | |
4080 | } | |
4081 | ||
4082 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) | |
4083 | { | |
4084 | return -EOPNOTSUPP; | |
4085 | } | |
4086 | ||
4087 | static int io_recv(struct io_kiocb *req, bool force_nonblock) | |
4088 | { | |
4089 | return -EOPNOTSUPP; | |
4090 | } | |
4091 | ||
4092 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4093 | { | |
4094 | return -EOPNOTSUPP; | |
4095 | } | |
4096 | ||
4097 | static int io_accept(struct io_kiocb *req, bool force_nonblock) | |
4098 | { | |
4099 | return -EOPNOTSUPP; | |
4100 | } | |
4101 | ||
4102 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4103 | { | |
4104 | return -EOPNOTSUPP; | |
4105 | } | |
4106 | ||
4107 | static int io_connect(struct io_kiocb *req, bool force_nonblock) | |
4108 | { | |
f8e85cf2 | 4109 | return -EOPNOTSUPP; |
f8e85cf2 | 4110 | } |
469956e8 | 4111 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4112 | |
d7718a9d JA |
4113 | struct io_poll_table { |
4114 | struct poll_table_struct pt; | |
4115 | struct io_kiocb *req; | |
4116 | int error; | |
4117 | }; | |
4118 | ||
d7718a9d JA |
4119 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4120 | __poll_t mask, task_work_func_t func) | |
4121 | { | |
4122 | struct task_struct *tsk; | |
aa96bf8a | 4123 | int ret; |
d7718a9d JA |
4124 | |
4125 | /* for instances that support it check for an event match first: */ | |
4126 | if (mask && !(mask & poll->events)) | |
4127 | return 0; | |
4128 | ||
4129 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4130 | ||
4131 | list_del_init(&poll->wait.entry); | |
4132 | ||
4133 | tsk = req->task; | |
4134 | req->result = mask; | |
4135 | init_task_work(&req->task_work, func); | |
4136 | /* | |
aa96bf8a JA |
4137 | * If this fails, then the task is exiting. Punt to one of the io-wq |
4138 | * threads to ensure the work gets run, we can't always rely on exit | |
4139 | * cancelation taking care of this. | |
d7718a9d | 4140 | */ |
aa96bf8a JA |
4141 | ret = task_work_add(tsk, &req->task_work, true); |
4142 | if (unlikely(ret)) { | |
4143 | tsk = io_wq_get_task(req->ctx->io_wq); | |
4144 | task_work_add(tsk, &req->task_work, true); | |
4145 | } | |
d7718a9d JA |
4146 | wake_up_process(tsk); |
4147 | return 1; | |
4148 | } | |
4149 | ||
74ce6ce4 JA |
4150 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4151 | __acquires(&req->ctx->completion_lock) | |
4152 | { | |
4153 | struct io_ring_ctx *ctx = req->ctx; | |
4154 | ||
4155 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4156 | struct poll_table_struct pt = { ._key = poll->events }; | |
4157 | ||
4158 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4159 | } | |
4160 | ||
4161 | spin_lock_irq(&ctx->completion_lock); | |
4162 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4163 | add_wait_queue(poll->head, &poll->wait); | |
4164 | return true; | |
4165 | } | |
4166 | ||
4167 | return false; | |
4168 | } | |
4169 | ||
18bceab1 JA |
4170 | static void io_poll_remove_double(struct io_kiocb *req) |
4171 | { | |
4172 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4173 | ||
4174 | lockdep_assert_held(&req->ctx->completion_lock); | |
4175 | ||
4176 | if (poll && poll->head) { | |
4177 | struct wait_queue_head *head = poll->head; | |
4178 | ||
4179 | spin_lock(&head->lock); | |
4180 | list_del_init(&poll->wait.entry); | |
4181 | if (poll->wait.private) | |
4182 | refcount_dec(&req->refs); | |
4183 | poll->head = NULL; | |
4184 | spin_unlock(&head->lock); | |
4185 | } | |
4186 | } | |
4187 | ||
4188 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4189 | { | |
4190 | struct io_ring_ctx *ctx = req->ctx; | |
4191 | ||
4192 | io_poll_remove_double(req); | |
4193 | req->poll.done = true; | |
4194 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4195 | io_commit_cqring(ctx); | |
4196 | } | |
4197 | ||
4198 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4199 | { | |
4200 | struct io_ring_ctx *ctx = req->ctx; | |
4201 | ||
4202 | if (io_poll_rewait(req, &req->poll)) { | |
4203 | spin_unlock_irq(&ctx->completion_lock); | |
4204 | return; | |
4205 | } | |
4206 | ||
4207 | hash_del(&req->hash_node); | |
4208 | io_poll_complete(req, req->result, 0); | |
4209 | req->flags |= REQ_F_COMP_LOCKED; | |
4210 | io_put_req_find_next(req, nxt); | |
4211 | spin_unlock_irq(&ctx->completion_lock); | |
4212 | ||
4213 | io_cqring_ev_posted(ctx); | |
4214 | } | |
4215 | ||
4216 | static void io_poll_task_func(struct callback_head *cb) | |
4217 | { | |
4218 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4219 | struct io_kiocb *nxt = NULL; | |
4220 | ||
4221 | io_poll_task_handler(req, &nxt); | |
4222 | if (nxt) { | |
4223 | struct io_ring_ctx *ctx = nxt->ctx; | |
4224 | ||
4225 | mutex_lock(&ctx->uring_lock); | |
4226 | __io_queue_sqe(nxt, NULL); | |
4227 | mutex_unlock(&ctx->uring_lock); | |
4228 | } | |
4229 | } | |
4230 | ||
4231 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4232 | int sync, void *key) | |
4233 | { | |
4234 | struct io_kiocb *req = wait->private; | |
4235 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4236 | __poll_t mask = key_to_poll(key); | |
4237 | ||
4238 | /* for instances that support it check for an event match first: */ | |
4239 | if (mask && !(mask & poll->events)) | |
4240 | return 0; | |
4241 | ||
4242 | if (req->poll.head) { | |
4243 | bool done; | |
4244 | ||
4245 | spin_lock(&req->poll.head->lock); | |
4246 | done = list_empty(&req->poll.wait.entry); | |
4247 | if (!done) | |
4248 | list_del_init(&req->poll.wait.entry); | |
4249 | spin_unlock(&req->poll.head->lock); | |
4250 | if (!done) | |
4251 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4252 | } | |
4253 | refcount_dec(&req->refs); | |
4254 | return 1; | |
4255 | } | |
4256 | ||
4257 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4258 | wait_queue_func_t wake_func) | |
4259 | { | |
4260 | poll->head = NULL; | |
4261 | poll->done = false; | |
4262 | poll->canceled = false; | |
4263 | poll->events = events; | |
4264 | INIT_LIST_HEAD(&poll->wait.entry); | |
4265 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4266 | } | |
4267 | ||
4268 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
4269 | struct wait_queue_head *head) | |
4270 | { | |
4271 | struct io_kiocb *req = pt->req; | |
4272 | ||
4273 | /* | |
4274 | * If poll->head is already set, it's because the file being polled | |
4275 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4276 | * for write). Setup a separate io_poll_iocb if this happens. | |
4277 | */ | |
4278 | if (unlikely(poll->head)) { | |
4279 | /* already have a 2nd entry, fail a third attempt */ | |
4280 | if (req->io) { | |
4281 | pt->error = -EINVAL; | |
4282 | return; | |
4283 | } | |
4284 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4285 | if (!poll) { | |
4286 | pt->error = -ENOMEM; | |
4287 | return; | |
4288 | } | |
4289 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4290 | refcount_inc(&req->refs); | |
4291 | poll->wait.private = req; | |
4292 | req->io = (void *) poll; | |
4293 | } | |
4294 | ||
4295 | pt->error = 0; | |
4296 | poll->head = head; | |
4297 | add_wait_queue(head, &poll->wait); | |
4298 | } | |
4299 | ||
4300 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4301 | struct poll_table_struct *p) | |
4302 | { | |
4303 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4304 | ||
4305 | __io_queue_proc(&pt->req->apoll->poll, pt, head); | |
4306 | } | |
4307 | ||
d7718a9d JA |
4308 | static void io_async_task_func(struct callback_head *cb) |
4309 | { | |
4310 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4311 | struct async_poll *apoll = req->apoll; | |
4312 | struct io_ring_ctx *ctx = req->ctx; | |
31067255 | 4313 | bool canceled = false; |
d7718a9d JA |
4314 | |
4315 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4316 | ||
74ce6ce4 | 4317 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4318 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 4319 | return; |
d7718a9d JA |
4320 | } |
4321 | ||
31067255 JA |
4322 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
4323 | if (hash_hashed(&req->hash_node)) { | |
74ce6ce4 | 4324 | hash_del(&req->hash_node); |
31067255 JA |
4325 | } else { |
4326 | canceled = READ_ONCE(apoll->poll.canceled); | |
4327 | if (canceled) { | |
4328 | io_cqring_fill_event(req, -ECANCELED); | |
4329 | io_commit_cqring(ctx); | |
4330 | } | |
2bae047e JA |
4331 | } |
4332 | ||
74ce6ce4 JA |
4333 | spin_unlock_irq(&ctx->completion_lock); |
4334 | ||
44575a67 XW |
4335 | /* restore ->work in case we need to retry again */ |
4336 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
31067255 | 4337 | kfree(apoll); |
44575a67 | 4338 | |
31067255 JA |
4339 | if (!canceled) { |
4340 | __set_current_state(TASK_RUNNING); | |
4341 | mutex_lock(&ctx->uring_lock); | |
4342 | __io_queue_sqe(req, NULL); | |
4343 | mutex_unlock(&ctx->uring_lock); | |
4344 | } else { | |
2bae047e JA |
4345 | io_cqring_ev_posted(ctx); |
4346 | req_set_fail_links(req); | |
44575a67 | 4347 | io_double_put_req(req); |
2bae047e | 4348 | } |
d7718a9d JA |
4349 | } |
4350 | ||
4351 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4352 | void *key) | |
4353 | { | |
4354 | struct io_kiocb *req = wait->private; | |
4355 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4356 | ||
4357 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4358 | key_to_poll(key)); | |
4359 | ||
4360 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4361 | } | |
4362 | ||
4363 | static void io_poll_req_insert(struct io_kiocb *req) | |
4364 | { | |
4365 | struct io_ring_ctx *ctx = req->ctx; | |
4366 | struct hlist_head *list; | |
4367 | ||
4368 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4369 | hlist_add_head(&req->hash_node, list); | |
4370 | } | |
4371 | ||
4372 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4373 | struct io_poll_iocb *poll, | |
4374 | struct io_poll_table *ipt, __poll_t mask, | |
4375 | wait_queue_func_t wake_func) | |
4376 | __acquires(&ctx->completion_lock) | |
4377 | { | |
4378 | struct io_ring_ctx *ctx = req->ctx; | |
4379 | bool cancel = false; | |
4380 | ||
4381 | poll->file = req->file; | |
18bceab1 JA |
4382 | io_init_poll_iocb(poll, mask, wake_func); |
4383 | poll->wait.private = req; | |
d7718a9d JA |
4384 | |
4385 | ipt->pt._key = mask; | |
4386 | ipt->req = req; | |
4387 | ipt->error = -EINVAL; | |
4388 | ||
d7718a9d JA |
4389 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4390 | ||
4391 | spin_lock_irq(&ctx->completion_lock); | |
4392 | if (likely(poll->head)) { | |
4393 | spin_lock(&poll->head->lock); | |
4394 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4395 | if (ipt->error) | |
4396 | cancel = true; | |
4397 | ipt->error = 0; | |
4398 | mask = 0; | |
4399 | } | |
4400 | if (mask || ipt->error) | |
4401 | list_del_init(&poll->wait.entry); | |
4402 | else if (cancel) | |
4403 | WRITE_ONCE(poll->canceled, true); | |
4404 | else if (!poll->done) /* actually waiting for an event */ | |
4405 | io_poll_req_insert(req); | |
4406 | spin_unlock(&poll->head->lock); | |
4407 | } | |
4408 | ||
4409 | return mask; | |
4410 | } | |
4411 | ||
4412 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4413 | { | |
4414 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4415 | struct io_ring_ctx *ctx = req->ctx; | |
4416 | struct async_poll *apoll; | |
4417 | struct io_poll_table ipt; | |
4418 | __poll_t mask, ret; | |
18bceab1 | 4419 | bool had_io; |
d7718a9d JA |
4420 | |
4421 | if (!req->file || !file_can_poll(req->file)) | |
4422 | return false; | |
4423 | if (req->flags & (REQ_F_MUST_PUNT | REQ_F_POLLED)) | |
4424 | return false; | |
4425 | if (!def->pollin && !def->pollout) | |
4426 | return false; | |
4427 | ||
4428 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4429 | if (unlikely(!apoll)) | |
4430 | return false; | |
4431 | ||
4432 | req->flags |= REQ_F_POLLED; | |
4433 | memcpy(&apoll->work, &req->work, sizeof(req->work)); | |
18bceab1 | 4434 | had_io = req->io != NULL; |
d7718a9d | 4435 | |
3537b6a7 | 4436 | get_task_struct(current); |
d7718a9d JA |
4437 | req->task = current; |
4438 | req->apoll = apoll; | |
4439 | INIT_HLIST_NODE(&req->hash_node); | |
4440 | ||
8755d97a | 4441 | mask = 0; |
d7718a9d | 4442 | if (def->pollin) |
8755d97a | 4443 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4444 | if (def->pollout) |
4445 | mask |= POLLOUT | POLLWRNORM; | |
4446 | mask |= POLLERR | POLLPRI; | |
4447 | ||
4448 | ipt.pt._qproc = io_async_queue_proc; | |
4449 | ||
4450 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4451 | io_async_wake); | |
4452 | if (ret) { | |
4453 | ipt.error = 0; | |
18bceab1 JA |
4454 | /* only remove double add if we did it here */ |
4455 | if (!had_io) | |
4456 | io_poll_remove_double(req); | |
d7718a9d JA |
4457 | spin_unlock_irq(&ctx->completion_lock); |
4458 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
4459 | kfree(apoll); | |
4460 | return false; | |
4461 | } | |
4462 | spin_unlock_irq(&ctx->completion_lock); | |
4463 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4464 | apoll->poll.events); | |
4465 | return true; | |
4466 | } | |
4467 | ||
4468 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4469 | struct io_poll_iocb *poll) | |
221c5eb2 | 4470 | { |
b41e9852 | 4471 | bool do_complete = false; |
221c5eb2 JA |
4472 | |
4473 | spin_lock(&poll->head->lock); | |
4474 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4475 | if (!list_empty(&poll->wait.entry)) { |
4476 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4477 | do_complete = true; |
221c5eb2 JA |
4478 | } |
4479 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4480 | hash_del(&req->hash_node); |
d7718a9d JA |
4481 | return do_complete; |
4482 | } | |
4483 | ||
4484 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4485 | { | |
4486 | bool do_complete; | |
4487 | ||
4488 | if (req->opcode == IORING_OP_POLL_ADD) { | |
18bceab1 | 4489 | io_poll_remove_double(req); |
d7718a9d JA |
4490 | do_complete = __io_poll_remove_one(req, &req->poll); |
4491 | } else { | |
3bfa5bcb JA |
4492 | struct async_poll *apoll = req->apoll; |
4493 | ||
d7718a9d | 4494 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4495 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4496 | if (do_complete) { | |
d7718a9d | 4497 | io_put_req(req); |
3bfa5bcb JA |
4498 | /* |
4499 | * restore ->work because we will call | |
4500 | * io_req_work_drop_env below when dropping the | |
4501 | * final reference. | |
4502 | */ | |
4503 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
4504 | kfree(apoll); | |
4505 | } | |
b1f573bd XW |
4506 | } |
4507 | ||
b41e9852 JA |
4508 | if (do_complete) { |
4509 | io_cqring_fill_event(req, -ECANCELED); | |
4510 | io_commit_cqring(req->ctx); | |
4511 | req->flags |= REQ_F_COMP_LOCKED; | |
4512 | io_put_req(req); | |
4513 | } | |
4514 | ||
4515 | return do_complete; | |
221c5eb2 JA |
4516 | } |
4517 | ||
4518 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4519 | { | |
78076bb6 | 4520 | struct hlist_node *tmp; |
221c5eb2 | 4521 | struct io_kiocb *req; |
8e2e1faf | 4522 | int posted = 0, i; |
221c5eb2 JA |
4523 | |
4524 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4525 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4526 | struct hlist_head *list; | |
4527 | ||
4528 | list = &ctx->cancel_hash[i]; | |
4529 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4530 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4531 | } |
4532 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4533 | |
8e2e1faf JA |
4534 | if (posted) |
4535 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4536 | } |
4537 | ||
47f46768 JA |
4538 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4539 | { | |
78076bb6 | 4540 | struct hlist_head *list; |
47f46768 JA |
4541 | struct io_kiocb *req; |
4542 | ||
78076bb6 JA |
4543 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4544 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4545 | if (sqe_addr != req->user_data) |
4546 | continue; | |
4547 | if (io_poll_remove_one(req)) | |
eac406c6 | 4548 | return 0; |
b41e9852 | 4549 | return -EALREADY; |
47f46768 JA |
4550 | } |
4551 | ||
4552 | return -ENOENT; | |
4553 | } | |
4554 | ||
3529d8c2 JA |
4555 | static int io_poll_remove_prep(struct io_kiocb *req, |
4556 | const struct io_uring_sqe *sqe) | |
0969e783 | 4557 | { |
0969e783 JA |
4558 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4559 | return -EINVAL; | |
4560 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4561 | sqe->poll_events) | |
4562 | return -EINVAL; | |
4563 | ||
4564 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4565 | return 0; |
4566 | } | |
4567 | ||
221c5eb2 JA |
4568 | /* |
4569 | * Find a running poll command that matches one specified in sqe->addr, | |
4570 | * and remove it if found. | |
4571 | */ | |
fc4df999 | 4572 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4573 | { |
4574 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4575 | u64 addr; |
47f46768 | 4576 | int ret; |
221c5eb2 | 4577 | |
0969e783 | 4578 | addr = req->poll.addr; |
221c5eb2 | 4579 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4580 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4581 | spin_unlock_irq(&ctx->completion_lock); |
4582 | ||
78e19bbe | 4583 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
4584 | if (ret < 0) |
4585 | req_set_fail_links(req); | |
e65ef56d | 4586 | io_put_req(req); |
221c5eb2 JA |
4587 | return 0; |
4588 | } | |
4589 | ||
221c5eb2 JA |
4590 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
4591 | void *key) | |
4592 | { | |
c2f2eb7d JA |
4593 | struct io_kiocb *req = wait->private; |
4594 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4595 | |
d7718a9d | 4596 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
4597 | } |
4598 | ||
221c5eb2 JA |
4599 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
4600 | struct poll_table_struct *p) | |
4601 | { | |
4602 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4603 | ||
d7718a9d | 4604 | __io_queue_proc(&pt->req->poll, pt, head); |
eac406c6 JA |
4605 | } |
4606 | ||
3529d8c2 | 4607 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
4608 | { |
4609 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4610 | u16 events; |
221c5eb2 JA |
4611 | |
4612 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4613 | return -EINVAL; | |
4614 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
4615 | return -EINVAL; | |
09bb8394 JA |
4616 | if (!poll->file) |
4617 | return -EBADF; | |
221c5eb2 | 4618 | |
221c5eb2 JA |
4619 | events = READ_ONCE(sqe->poll_events); |
4620 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP; | |
b41e9852 | 4621 | |
3537b6a7 | 4622 | get_task_struct(current); |
b41e9852 | 4623 | req->task = current; |
0969e783 JA |
4624 | return 0; |
4625 | } | |
4626 | ||
014db007 | 4627 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
4628 | { |
4629 | struct io_poll_iocb *poll = &req->poll; | |
4630 | struct io_ring_ctx *ctx = req->ctx; | |
4631 | struct io_poll_table ipt; | |
0969e783 | 4632 | __poll_t mask; |
0969e783 | 4633 | |
78076bb6 | 4634 | INIT_HLIST_NODE(&req->hash_node); |
36703247 | 4635 | INIT_LIST_HEAD(&req->list); |
d7718a9d | 4636 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 4637 | |
d7718a9d JA |
4638 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
4639 | io_poll_wake); | |
221c5eb2 | 4640 | |
8c838788 | 4641 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 4642 | ipt.error = 0; |
b0dd8a41 | 4643 | io_poll_complete(req, mask, 0); |
221c5eb2 | 4644 | } |
221c5eb2 JA |
4645 | spin_unlock_irq(&ctx->completion_lock); |
4646 | ||
8c838788 JA |
4647 | if (mask) { |
4648 | io_cqring_ev_posted(ctx); | |
014db007 | 4649 | io_put_req(req); |
221c5eb2 | 4650 | } |
8c838788 | 4651 | return ipt.error; |
221c5eb2 JA |
4652 | } |
4653 | ||
5262f567 JA |
4654 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
4655 | { | |
ad8a48ac JA |
4656 | struct io_timeout_data *data = container_of(timer, |
4657 | struct io_timeout_data, timer); | |
4658 | struct io_kiocb *req = data->req; | |
4659 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
4660 | unsigned long flags; |
4661 | ||
5262f567 JA |
4662 | atomic_inc(&ctx->cq_timeouts); |
4663 | ||
4664 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
ef03681a | 4665 | /* |
11365043 JA |
4666 | * We could be racing with timeout deletion. If the list is empty, |
4667 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 4668 | */ |
842f9612 | 4669 | if (!list_empty(&req->list)) { |
11365043 | 4670 | struct io_kiocb *prev; |
5262f567 | 4671 | |
11365043 JA |
4672 | /* |
4673 | * Adjust the reqs sequence before the current one because it | |
d195a66e | 4674 | * will consume a slot in the cq_ring and the cq_tail |
11365043 JA |
4675 | * pointer will be increased, otherwise other timeout reqs may |
4676 | * return in advance without waiting for enough wait_nr. | |
4677 | */ | |
4678 | prev = req; | |
4679 | list_for_each_entry_continue_reverse(prev, &ctx->timeout_list, list) | |
4680 | prev->sequence++; | |
11365043 | 4681 | list_del_init(&req->list); |
11365043 | 4682 | } |
5262f567 | 4683 | |
78e19bbe | 4684 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
4685 | io_commit_cqring(ctx); |
4686 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4687 | ||
4688 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 4689 | req_set_fail_links(req); |
5262f567 JA |
4690 | io_put_req(req); |
4691 | return HRTIMER_NORESTART; | |
4692 | } | |
4693 | ||
47f46768 JA |
4694 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
4695 | { | |
4696 | struct io_kiocb *req; | |
4697 | int ret = -ENOENT; | |
4698 | ||
4699 | list_for_each_entry(req, &ctx->timeout_list, list) { | |
4700 | if (user_data == req->user_data) { | |
4701 | list_del_init(&req->list); | |
4702 | ret = 0; | |
4703 | break; | |
4704 | } | |
4705 | } | |
4706 | ||
4707 | if (ret == -ENOENT) | |
4708 | return ret; | |
4709 | ||
2d28390a | 4710 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
4711 | if (ret == -1) |
4712 | return -EALREADY; | |
4713 | ||
4e88d6e7 | 4714 | req_set_fail_links(req); |
47f46768 JA |
4715 | io_cqring_fill_event(req, -ECANCELED); |
4716 | io_put_req(req); | |
4717 | return 0; | |
4718 | } | |
4719 | ||
3529d8c2 JA |
4720 | static int io_timeout_remove_prep(struct io_kiocb *req, |
4721 | const struct io_uring_sqe *sqe) | |
b29472ee | 4722 | { |
b29472ee JA |
4723 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4724 | return -EINVAL; | |
4725 | if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len) | |
4726 | return -EINVAL; | |
4727 | ||
4728 | req->timeout.addr = READ_ONCE(sqe->addr); | |
4729 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
4730 | if (req->timeout.flags) | |
4731 | return -EINVAL; | |
4732 | ||
b29472ee JA |
4733 | return 0; |
4734 | } | |
4735 | ||
11365043 JA |
4736 | /* |
4737 | * Remove or update an existing timeout command | |
4738 | */ | |
fc4df999 | 4739 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
4740 | { |
4741 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 4742 | int ret; |
11365043 | 4743 | |
11365043 | 4744 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 4745 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 4746 | |
47f46768 | 4747 | io_cqring_fill_event(req, ret); |
11365043 JA |
4748 | io_commit_cqring(ctx); |
4749 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 4750 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
4751 | if (ret < 0) |
4752 | req_set_fail_links(req); | |
ec9c02ad | 4753 | io_put_req(req); |
11365043 | 4754 | return 0; |
5262f567 JA |
4755 | } |
4756 | ||
3529d8c2 | 4757 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 4758 | bool is_timeout_link) |
5262f567 | 4759 | { |
ad8a48ac | 4760 | struct io_timeout_data *data; |
a41525ab | 4761 | unsigned flags; |
56080b02 | 4762 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 4763 | |
ad8a48ac | 4764 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 4765 | return -EINVAL; |
ad8a48ac | 4766 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 4767 | return -EINVAL; |
56080b02 | 4768 | if (off && is_timeout_link) |
2d28390a | 4769 | return -EINVAL; |
a41525ab JA |
4770 | flags = READ_ONCE(sqe->timeout_flags); |
4771 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 4772 | return -EINVAL; |
bdf20073 | 4773 | |
56080b02 | 4774 | req->timeout.count = off; |
26a61679 | 4775 | |
3529d8c2 | 4776 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
4777 | return -ENOMEM; |
4778 | ||
4779 | data = &req->io->timeout; | |
ad8a48ac | 4780 | data->req = req; |
ad8a48ac JA |
4781 | req->flags |= REQ_F_TIMEOUT; |
4782 | ||
4783 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
4784 | return -EFAULT; |
4785 | ||
11365043 | 4786 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 4787 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 4788 | else |
ad8a48ac | 4789 | data->mode = HRTIMER_MODE_REL; |
11365043 | 4790 | |
ad8a48ac JA |
4791 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
4792 | return 0; | |
4793 | } | |
4794 | ||
fc4df999 | 4795 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 4796 | { |
ad8a48ac JA |
4797 | struct io_ring_ctx *ctx = req->ctx; |
4798 | struct io_timeout_data *data; | |
4799 | struct list_head *entry; | |
4800 | unsigned span = 0; | |
b55ce732 | 4801 | u32 count = req->timeout.count; |
22cad158 | 4802 | u32 seq = req->sequence; |
ad8a48ac | 4803 | |
2d28390a | 4804 | data = &req->io->timeout; |
733f5c95 | 4805 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 4806 | |
5262f567 JA |
4807 | /* |
4808 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
4809 | * timeout event to be satisfied. If it isn't set, then this is |
4810 | * a pure timeout request, sequence isn't used. | |
5262f567 | 4811 | */ |
93bd25bb JA |
4812 | if (!count) { |
4813 | req->flags |= REQ_F_TIMEOUT_NOSEQ; | |
93bd25bb JA |
4814 | entry = ctx->timeout_list.prev; |
4815 | goto add; | |
4816 | } | |
5262f567 | 4817 | |
22cad158 | 4818 | req->sequence = seq + count; |
5262f567 JA |
4819 | |
4820 | /* | |
4821 | * Insertion sort, ensuring the first entry in the list is always | |
4822 | * the one we need first. | |
4823 | */ | |
5262f567 JA |
4824 | list_for_each_prev(entry, &ctx->timeout_list) { |
4825 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, list); | |
22cad158 | 4826 | unsigned nxt_seq; |
5da0fb1a | 4827 | long long tmp, tmp_nxt; |
b55ce732 | 4828 | u32 nxt_offset = nxt->timeout.count; |
5262f567 | 4829 | |
93bd25bb JA |
4830 | if (nxt->flags & REQ_F_TIMEOUT_NOSEQ) |
4831 | continue; | |
4832 | ||
5da0fb1a | 4833 | /* |
22cad158 | 4834 | * Since seq + count can overflow, use type long |
5da0fb1a | 4835 | * long to store it. |
4836 | */ | |
22cad158 PB |
4837 | tmp = (long long)seq + count; |
4838 | nxt_seq = nxt->sequence - nxt_offset; | |
4839 | tmp_nxt = (long long)nxt_seq + nxt_offset; | |
5da0fb1a | 4840 | |
4841 | /* | |
4842 | * cached_sq_head may overflow, and it will never overflow twice | |
4843 | * once there is some timeout req still be valid. | |
4844 | */ | |
22cad158 | 4845 | if (seq < nxt_seq) |
8b07a65a | 4846 | tmp += UINT_MAX; |
5da0fb1a | 4847 | |
a1f58ba4 | 4848 | if (tmp > tmp_nxt) |
5262f567 | 4849 | break; |
a1f58ba4 | 4850 | |
4851 | /* | |
4852 | * Sequence of reqs after the insert one and itself should | |
4853 | * be adjusted because each timeout req consumes a slot. | |
4854 | */ | |
4855 | span++; | |
4856 | nxt->sequence++; | |
5262f567 | 4857 | } |
a1f58ba4 | 4858 | req->sequence -= span; |
93bd25bb | 4859 | add: |
5262f567 | 4860 | list_add(&req->list, entry); |
ad8a48ac JA |
4861 | data->timer.function = io_timeout_fn; |
4862 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 4863 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
4864 | return 0; |
4865 | } | |
5262f567 | 4866 | |
62755e35 JA |
4867 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
4868 | { | |
4869 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
4870 | ||
4871 | return req->user_data == (unsigned long) data; | |
4872 | } | |
4873 | ||
e977d6d3 | 4874 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 4875 | { |
62755e35 | 4876 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
4877 | int ret = 0; |
4878 | ||
62755e35 JA |
4879 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr); |
4880 | switch (cancel_ret) { | |
4881 | case IO_WQ_CANCEL_OK: | |
4882 | ret = 0; | |
4883 | break; | |
4884 | case IO_WQ_CANCEL_RUNNING: | |
4885 | ret = -EALREADY; | |
4886 | break; | |
4887 | case IO_WQ_CANCEL_NOTFOUND: | |
4888 | ret = -ENOENT; | |
4889 | break; | |
4890 | } | |
4891 | ||
e977d6d3 JA |
4892 | return ret; |
4893 | } | |
4894 | ||
47f46768 JA |
4895 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
4896 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 4897 | int success_ret) |
47f46768 JA |
4898 | { |
4899 | unsigned long flags; | |
4900 | int ret; | |
4901 | ||
4902 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
4903 | if (ret != -ENOENT) { | |
4904 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4905 | goto done; | |
4906 | } | |
4907 | ||
4908 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4909 | ret = io_timeout_cancel(ctx, sqe_addr); | |
4910 | if (ret != -ENOENT) | |
4911 | goto done; | |
4912 | ret = io_poll_cancel(ctx, sqe_addr); | |
4913 | done: | |
b0dd8a41 JA |
4914 | if (!ret) |
4915 | ret = success_ret; | |
47f46768 JA |
4916 | io_cqring_fill_event(req, ret); |
4917 | io_commit_cqring(ctx); | |
4918 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4919 | io_cqring_ev_posted(ctx); | |
4920 | ||
4e88d6e7 JA |
4921 | if (ret < 0) |
4922 | req_set_fail_links(req); | |
014db007 | 4923 | io_put_req(req); |
47f46768 JA |
4924 | } |
4925 | ||
3529d8c2 JA |
4926 | static int io_async_cancel_prep(struct io_kiocb *req, |
4927 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 4928 | { |
fbf23849 | 4929 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 JA |
4930 | return -EINVAL; |
4931 | if (sqe->flags || sqe->ioprio || sqe->off || sqe->len || | |
4932 | sqe->cancel_flags) | |
4933 | return -EINVAL; | |
4934 | ||
fbf23849 JA |
4935 | req->cancel.addr = READ_ONCE(sqe->addr); |
4936 | return 0; | |
4937 | } | |
4938 | ||
014db007 | 4939 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
4940 | { |
4941 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 4942 | |
014db007 | 4943 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
4944 | return 0; |
4945 | } | |
4946 | ||
05f3fb3c JA |
4947 | static int io_files_update_prep(struct io_kiocb *req, |
4948 | const struct io_uring_sqe *sqe) | |
4949 | { | |
4950 | if (sqe->flags || sqe->ioprio || sqe->rw_flags) | |
4951 | return -EINVAL; | |
4952 | ||
4953 | req->files_update.offset = READ_ONCE(sqe->off); | |
4954 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
4955 | if (!req->files_update.nr_args) | |
4956 | return -EINVAL; | |
4957 | req->files_update.arg = READ_ONCE(sqe->addr); | |
4958 | return 0; | |
4959 | } | |
4960 | ||
4961 | static int io_files_update(struct io_kiocb *req, bool force_nonblock) | |
fbf23849 JA |
4962 | { |
4963 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
4964 | struct io_uring_files_update up; |
4965 | int ret; | |
fbf23849 | 4966 | |
f86cd20c | 4967 | if (force_nonblock) |
05f3fb3c | 4968 | return -EAGAIN; |
05f3fb3c JA |
4969 | |
4970 | up.offset = req->files_update.offset; | |
4971 | up.fds = req->files_update.arg; | |
4972 | ||
4973 | mutex_lock(&ctx->uring_lock); | |
4974 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
4975 | mutex_unlock(&ctx->uring_lock); | |
4976 | ||
4977 | if (ret < 0) | |
4978 | req_set_fail_links(req); | |
4979 | io_cqring_add_event(req, ret); | |
4980 | io_put_req(req); | |
5262f567 JA |
4981 | return 0; |
4982 | } | |
4983 | ||
3529d8c2 JA |
4984 | static int io_req_defer_prep(struct io_kiocb *req, |
4985 | const struct io_uring_sqe *sqe) | |
f67676d1 | 4986 | { |
e781573e | 4987 | ssize_t ret = 0; |
f67676d1 | 4988 | |
f1d96a8f PB |
4989 | if (!sqe) |
4990 | return 0; | |
4991 | ||
f86cd20c JA |
4992 | if (io_op_defs[req->opcode].file_table) { |
4993 | ret = io_grab_files(req); | |
4994 | if (unlikely(ret)) | |
4995 | return ret; | |
4996 | } | |
4997 | ||
cccf0ee8 JA |
4998 | io_req_work_grab_env(req, &io_op_defs[req->opcode]); |
4999 | ||
d625c6ee | 5000 | switch (req->opcode) { |
e781573e JA |
5001 | case IORING_OP_NOP: |
5002 | break; | |
f67676d1 JA |
5003 | case IORING_OP_READV: |
5004 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5005 | case IORING_OP_READ: |
3529d8c2 | 5006 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5007 | break; |
5008 | case IORING_OP_WRITEV: | |
5009 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5010 | case IORING_OP_WRITE: |
3529d8c2 | 5011 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5012 | break; |
0969e783 | 5013 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5014 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5015 | break; |
5016 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5017 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5018 | break; |
8ed8d3c3 | 5019 | case IORING_OP_FSYNC: |
3529d8c2 | 5020 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5021 | break; |
5022 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5023 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5024 | break; |
03b1230c | 5025 | case IORING_OP_SENDMSG: |
fddaface | 5026 | case IORING_OP_SEND: |
3529d8c2 | 5027 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5028 | break; |
5029 | case IORING_OP_RECVMSG: | |
fddaface | 5030 | case IORING_OP_RECV: |
3529d8c2 | 5031 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5032 | break; |
f499a021 | 5033 | case IORING_OP_CONNECT: |
3529d8c2 | 5034 | ret = io_connect_prep(req, sqe); |
f499a021 | 5035 | break; |
2d28390a | 5036 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5037 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5038 | break; |
b29472ee | 5039 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5040 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5041 | break; |
fbf23849 | 5042 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5043 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5044 | break; |
2d28390a | 5045 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5046 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5047 | break; |
8ed8d3c3 | 5048 | case IORING_OP_ACCEPT: |
3529d8c2 | 5049 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5050 | break; |
d63d1b5e JA |
5051 | case IORING_OP_FALLOCATE: |
5052 | ret = io_fallocate_prep(req, sqe); | |
5053 | break; | |
15b71abe JA |
5054 | case IORING_OP_OPENAT: |
5055 | ret = io_openat_prep(req, sqe); | |
5056 | break; | |
b5dba59e JA |
5057 | case IORING_OP_CLOSE: |
5058 | ret = io_close_prep(req, sqe); | |
5059 | break; | |
05f3fb3c JA |
5060 | case IORING_OP_FILES_UPDATE: |
5061 | ret = io_files_update_prep(req, sqe); | |
5062 | break; | |
eddc7ef5 JA |
5063 | case IORING_OP_STATX: |
5064 | ret = io_statx_prep(req, sqe); | |
5065 | break; | |
4840e418 JA |
5066 | case IORING_OP_FADVISE: |
5067 | ret = io_fadvise_prep(req, sqe); | |
5068 | break; | |
c1ca757b JA |
5069 | case IORING_OP_MADVISE: |
5070 | ret = io_madvise_prep(req, sqe); | |
5071 | break; | |
cebdb986 JA |
5072 | case IORING_OP_OPENAT2: |
5073 | ret = io_openat2_prep(req, sqe); | |
5074 | break; | |
3e4827b0 JA |
5075 | case IORING_OP_EPOLL_CTL: |
5076 | ret = io_epoll_ctl_prep(req, sqe); | |
5077 | break; | |
7d67af2c PB |
5078 | case IORING_OP_SPLICE: |
5079 | ret = io_splice_prep(req, sqe); | |
5080 | break; | |
ddf0322d JA |
5081 | case IORING_OP_PROVIDE_BUFFERS: |
5082 | ret = io_provide_buffers_prep(req, sqe); | |
5083 | break; | |
067524e9 JA |
5084 | case IORING_OP_REMOVE_BUFFERS: |
5085 | ret = io_remove_buffers_prep(req, sqe); | |
5086 | break; | |
f2a8d5c7 PB |
5087 | case IORING_OP_TEE: |
5088 | ret = io_tee_prep(req, sqe); | |
5089 | break; | |
f67676d1 | 5090 | default: |
e781573e JA |
5091 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5092 | req->opcode); | |
5093 | ret = -EINVAL; | |
b7bb4f7d | 5094 | break; |
f67676d1 JA |
5095 | } |
5096 | ||
b7bb4f7d | 5097 | return ret; |
f67676d1 JA |
5098 | } |
5099 | ||
3529d8c2 | 5100 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5101 | { |
a197f664 | 5102 | struct io_ring_ctx *ctx = req->ctx; |
f67676d1 | 5103 | int ret; |
de0617e4 | 5104 | |
9d858b21 | 5105 | /* Still need defer if there is pending req in defer list. */ |
4ee36314 | 5106 | if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list)) |
de0617e4 JA |
5107 | return 0; |
5108 | ||
3529d8c2 | 5109 | if (!req->io && io_alloc_async_ctx(req)) |
de0617e4 JA |
5110 | return -EAGAIN; |
5111 | ||
3529d8c2 | 5112 | ret = io_req_defer_prep(req, sqe); |
b7bb4f7d | 5113 | if (ret < 0) |
2d28390a | 5114 | return ret; |
2d28390a | 5115 | |
de0617e4 | 5116 | spin_lock_irq(&ctx->completion_lock); |
9d858b21 | 5117 | if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5118 | spin_unlock_irq(&ctx->completion_lock); |
de0617e4 JA |
5119 | return 0; |
5120 | } | |
5121 | ||
915967f6 | 5122 | trace_io_uring_defer(ctx, req, req->user_data); |
de0617e4 JA |
5123 | list_add_tail(&req->list, &ctx->defer_list); |
5124 | spin_unlock_irq(&ctx->completion_lock); | |
5125 | return -EIOCBQUEUED; | |
5126 | } | |
5127 | ||
99bc4c38 PB |
5128 | static void io_cleanup_req(struct io_kiocb *req) |
5129 | { | |
5130 | struct io_async_ctx *io = req->io; | |
5131 | ||
5132 | switch (req->opcode) { | |
5133 | case IORING_OP_READV: | |
5134 | case IORING_OP_READ_FIXED: | |
5135 | case IORING_OP_READ: | |
bcda7baa JA |
5136 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5137 | kfree((void *)(unsigned long)req->rw.addr); | |
5138 | /* fallthrough */ | |
99bc4c38 PB |
5139 | case IORING_OP_WRITEV: |
5140 | case IORING_OP_WRITE_FIXED: | |
5141 | case IORING_OP_WRITE: | |
5142 | if (io->rw.iov != io->rw.fast_iov) | |
5143 | kfree(io->rw.iov); | |
5144 | break; | |
99bc4c38 | 5145 | case IORING_OP_RECVMSG: |
52de1fe1 JA |
5146 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5147 | kfree(req->sr_msg.kbuf); | |
5148 | /* fallthrough */ | |
5149 | case IORING_OP_SENDMSG: | |
99bc4c38 PB |
5150 | if (io->msg.iov != io->msg.fast_iov) |
5151 | kfree(io->msg.iov); | |
5152 | break; | |
bcda7baa JA |
5153 | case IORING_OP_RECV: |
5154 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
5155 | kfree(req->sr_msg.kbuf); | |
5156 | break; | |
8fef80bf PB |
5157 | case IORING_OP_OPENAT: |
5158 | case IORING_OP_OPENAT2: | |
8fef80bf | 5159 | break; |
7d67af2c | 5160 | case IORING_OP_SPLICE: |
f2a8d5c7 | 5161 | case IORING_OP_TEE: |
7d67af2c PB |
5162 | io_put_file(req, req->splice.file_in, |
5163 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5164 | break; | |
99bc4c38 PB |
5165 | } |
5166 | ||
5167 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
5168 | } | |
5169 | ||
3529d8c2 | 5170 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
014db007 | 5171 | bool force_nonblock) |
2b188cc1 | 5172 | { |
a197f664 | 5173 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5174 | int ret; |
2b188cc1 | 5175 | |
d625c6ee | 5176 | switch (req->opcode) { |
2b188cc1 | 5177 | case IORING_OP_NOP: |
78e19bbe | 5178 | ret = io_nop(req); |
2b188cc1 JA |
5179 | break; |
5180 | case IORING_OP_READV: | |
edafccee | 5181 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5182 | case IORING_OP_READ: |
3529d8c2 JA |
5183 | if (sqe) { |
5184 | ret = io_read_prep(req, sqe, force_nonblock); | |
5185 | if (ret < 0) | |
5186 | break; | |
5187 | } | |
014db007 | 5188 | ret = io_read(req, force_nonblock); |
edafccee | 5189 | break; |
3529d8c2 | 5190 | case IORING_OP_WRITEV: |
edafccee | 5191 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5192 | case IORING_OP_WRITE: |
3529d8c2 JA |
5193 | if (sqe) { |
5194 | ret = io_write_prep(req, sqe, force_nonblock); | |
5195 | if (ret < 0) | |
5196 | break; | |
5197 | } | |
014db007 | 5198 | ret = io_write(req, force_nonblock); |
2b188cc1 | 5199 | break; |
c992fe29 | 5200 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5201 | if (sqe) { |
5202 | ret = io_prep_fsync(req, sqe); | |
5203 | if (ret < 0) | |
5204 | break; | |
5205 | } | |
014db007 | 5206 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5207 | break; |
221c5eb2 | 5208 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5209 | if (sqe) { |
5210 | ret = io_poll_add_prep(req, sqe); | |
5211 | if (ret) | |
5212 | break; | |
5213 | } | |
014db007 | 5214 | ret = io_poll_add(req); |
221c5eb2 JA |
5215 | break; |
5216 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5217 | if (sqe) { |
5218 | ret = io_poll_remove_prep(req, sqe); | |
5219 | if (ret < 0) | |
5220 | break; | |
5221 | } | |
fc4df999 | 5222 | ret = io_poll_remove(req); |
221c5eb2 | 5223 | break; |
5d17b4a4 | 5224 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5225 | if (sqe) { |
5226 | ret = io_prep_sfr(req, sqe); | |
5227 | if (ret < 0) | |
5228 | break; | |
5229 | } | |
014db007 | 5230 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5231 | break; |
0fa03c62 | 5232 | case IORING_OP_SENDMSG: |
fddaface | 5233 | case IORING_OP_SEND: |
3529d8c2 JA |
5234 | if (sqe) { |
5235 | ret = io_sendmsg_prep(req, sqe); | |
5236 | if (ret < 0) | |
5237 | break; | |
5238 | } | |
fddaface | 5239 | if (req->opcode == IORING_OP_SENDMSG) |
014db007 | 5240 | ret = io_sendmsg(req, force_nonblock); |
fddaface | 5241 | else |
014db007 | 5242 | ret = io_send(req, force_nonblock); |
0fa03c62 | 5243 | break; |
aa1fa28f | 5244 | case IORING_OP_RECVMSG: |
fddaface | 5245 | case IORING_OP_RECV: |
3529d8c2 JA |
5246 | if (sqe) { |
5247 | ret = io_recvmsg_prep(req, sqe); | |
5248 | if (ret) | |
5249 | break; | |
5250 | } | |
fddaface | 5251 | if (req->opcode == IORING_OP_RECVMSG) |
014db007 | 5252 | ret = io_recvmsg(req, force_nonblock); |
fddaface | 5253 | else |
014db007 | 5254 | ret = io_recv(req, force_nonblock); |
aa1fa28f | 5255 | break; |
5262f567 | 5256 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5257 | if (sqe) { |
5258 | ret = io_timeout_prep(req, sqe, false); | |
5259 | if (ret) | |
5260 | break; | |
5261 | } | |
fc4df999 | 5262 | ret = io_timeout(req); |
5262f567 | 5263 | break; |
11365043 | 5264 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5265 | if (sqe) { |
5266 | ret = io_timeout_remove_prep(req, sqe); | |
5267 | if (ret) | |
5268 | break; | |
5269 | } | |
fc4df999 | 5270 | ret = io_timeout_remove(req); |
11365043 | 5271 | break; |
17f2fe35 | 5272 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5273 | if (sqe) { |
5274 | ret = io_accept_prep(req, sqe); | |
5275 | if (ret) | |
5276 | break; | |
5277 | } | |
014db007 | 5278 | ret = io_accept(req, force_nonblock); |
17f2fe35 | 5279 | break; |
f8e85cf2 | 5280 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5281 | if (sqe) { |
5282 | ret = io_connect_prep(req, sqe); | |
5283 | if (ret) | |
5284 | break; | |
5285 | } | |
014db007 | 5286 | ret = io_connect(req, force_nonblock); |
f8e85cf2 | 5287 | break; |
62755e35 | 5288 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5289 | if (sqe) { |
5290 | ret = io_async_cancel_prep(req, sqe); | |
5291 | if (ret) | |
5292 | break; | |
5293 | } | |
014db007 | 5294 | ret = io_async_cancel(req); |
62755e35 | 5295 | break; |
d63d1b5e JA |
5296 | case IORING_OP_FALLOCATE: |
5297 | if (sqe) { | |
5298 | ret = io_fallocate_prep(req, sqe); | |
5299 | if (ret) | |
5300 | break; | |
5301 | } | |
014db007 | 5302 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5303 | break; |
15b71abe JA |
5304 | case IORING_OP_OPENAT: |
5305 | if (sqe) { | |
5306 | ret = io_openat_prep(req, sqe); | |
5307 | if (ret) | |
5308 | break; | |
5309 | } | |
014db007 | 5310 | ret = io_openat(req, force_nonblock); |
15b71abe | 5311 | break; |
b5dba59e JA |
5312 | case IORING_OP_CLOSE: |
5313 | if (sqe) { | |
5314 | ret = io_close_prep(req, sqe); | |
5315 | if (ret) | |
5316 | break; | |
5317 | } | |
014db007 | 5318 | ret = io_close(req, force_nonblock); |
b5dba59e | 5319 | break; |
05f3fb3c JA |
5320 | case IORING_OP_FILES_UPDATE: |
5321 | if (sqe) { | |
5322 | ret = io_files_update_prep(req, sqe); | |
5323 | if (ret) | |
5324 | break; | |
5325 | } | |
5326 | ret = io_files_update(req, force_nonblock); | |
5327 | break; | |
eddc7ef5 JA |
5328 | case IORING_OP_STATX: |
5329 | if (sqe) { | |
5330 | ret = io_statx_prep(req, sqe); | |
5331 | if (ret) | |
5332 | break; | |
5333 | } | |
014db007 | 5334 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5335 | break; |
4840e418 JA |
5336 | case IORING_OP_FADVISE: |
5337 | if (sqe) { | |
5338 | ret = io_fadvise_prep(req, sqe); | |
5339 | if (ret) | |
5340 | break; | |
5341 | } | |
014db007 | 5342 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5343 | break; |
c1ca757b JA |
5344 | case IORING_OP_MADVISE: |
5345 | if (sqe) { | |
5346 | ret = io_madvise_prep(req, sqe); | |
5347 | if (ret) | |
5348 | break; | |
5349 | } | |
014db007 | 5350 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5351 | break; |
cebdb986 JA |
5352 | case IORING_OP_OPENAT2: |
5353 | if (sqe) { | |
5354 | ret = io_openat2_prep(req, sqe); | |
5355 | if (ret) | |
5356 | break; | |
5357 | } | |
014db007 | 5358 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5359 | break; |
3e4827b0 JA |
5360 | case IORING_OP_EPOLL_CTL: |
5361 | if (sqe) { | |
5362 | ret = io_epoll_ctl_prep(req, sqe); | |
5363 | if (ret) | |
5364 | break; | |
5365 | } | |
014db007 | 5366 | ret = io_epoll_ctl(req, force_nonblock); |
3e4827b0 | 5367 | break; |
7d67af2c PB |
5368 | case IORING_OP_SPLICE: |
5369 | if (sqe) { | |
5370 | ret = io_splice_prep(req, sqe); | |
5371 | if (ret < 0) | |
5372 | break; | |
5373 | } | |
014db007 | 5374 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5375 | break; |
ddf0322d JA |
5376 | case IORING_OP_PROVIDE_BUFFERS: |
5377 | if (sqe) { | |
5378 | ret = io_provide_buffers_prep(req, sqe); | |
5379 | if (ret) | |
5380 | break; | |
5381 | } | |
5382 | ret = io_provide_buffers(req, force_nonblock); | |
5383 | break; | |
067524e9 JA |
5384 | case IORING_OP_REMOVE_BUFFERS: |
5385 | if (sqe) { | |
5386 | ret = io_remove_buffers_prep(req, sqe); | |
5387 | if (ret) | |
5388 | break; | |
5389 | } | |
5390 | ret = io_remove_buffers(req, force_nonblock); | |
3e4827b0 | 5391 | break; |
f2a8d5c7 PB |
5392 | case IORING_OP_TEE: |
5393 | if (sqe) { | |
5394 | ret = io_tee_prep(req, sqe); | |
5395 | if (ret < 0) | |
5396 | break; | |
5397 | } | |
5398 | ret = io_tee(req, force_nonblock); | |
5399 | break; | |
2b188cc1 JA |
5400 | default: |
5401 | ret = -EINVAL; | |
5402 | break; | |
5403 | } | |
5404 | ||
def596e9 JA |
5405 | if (ret) |
5406 | return ret; | |
5407 | ||
5408 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
11ba820b JA |
5409 | const bool in_async = io_wq_current_is_worker(); |
5410 | ||
9e645e11 | 5411 | if (req->result == -EAGAIN) |
def596e9 JA |
5412 | return -EAGAIN; |
5413 | ||
11ba820b JA |
5414 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5415 | if (in_async) | |
5416 | mutex_lock(&ctx->uring_lock); | |
5417 | ||
def596e9 | 5418 | io_iopoll_req_issued(req); |
11ba820b JA |
5419 | |
5420 | if (in_async) | |
5421 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5422 | } |
5423 | ||
5424 | return 0; | |
2b188cc1 JA |
5425 | } |
5426 | ||
561fb04a | 5427 | static void io_wq_submit_work(struct io_wq_work **workptr) |
2b188cc1 | 5428 | { |
561fb04a | 5429 | struct io_wq_work *work = *workptr; |
2b188cc1 | 5430 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
561fb04a | 5431 | int ret = 0; |
2b188cc1 | 5432 | |
0c9d5ccd JA |
5433 | /* if NO_CANCEL is set, we must still run the work */ |
5434 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5435 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5436 | ret = -ECANCELED; |
0c9d5ccd | 5437 | } |
31b51510 | 5438 | |
561fb04a | 5439 | if (!ret) { |
561fb04a | 5440 | do { |
014db007 | 5441 | ret = io_issue_sqe(req, NULL, false); |
561fb04a JA |
5442 | /* |
5443 | * We can get EAGAIN for polled IO even though we're | |
5444 | * forcing a sync submission from here, since we can't | |
5445 | * wait for request slots on the block side. | |
5446 | */ | |
5447 | if (ret != -EAGAIN) | |
5448 | break; | |
5449 | cond_resched(); | |
5450 | } while (1); | |
5451 | } | |
31b51510 | 5452 | |
561fb04a | 5453 | if (ret) { |
4e88d6e7 | 5454 | req_set_fail_links(req); |
78e19bbe | 5455 | io_cqring_add_event(req, ret); |
817869d2 | 5456 | io_put_req(req); |
edafccee | 5457 | } |
2b188cc1 | 5458 | |
e9fd9396 | 5459 | io_steal_work(req, workptr); |
2b188cc1 JA |
5460 | } |
5461 | ||
65e19f54 JA |
5462 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5463 | int index) | |
5464 | { | |
5465 | struct fixed_file_table *table; | |
5466 | ||
05f3fb3c | 5467 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5468 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5469 | } |
5470 | ||
8da11c19 PB |
5471 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5472 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5473 | { |
a197f664 | 5474 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5475 | struct file *file; |
09bb8394 | 5476 | |
8da11c19 | 5477 | if (fixed) { |
05f3fb3c | 5478 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5479 | (unsigned) fd >= ctx->nr_user_files)) |
5480 | return -EBADF; | |
b7620121 | 5481 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 PB |
5482 | file = io_file_from_index(ctx, fd); |
5483 | if (!file) | |
08a45173 | 5484 | return -EBADF; |
05589553 XW |
5485 | req->fixed_file_refs = ctx->file_data->cur_refs; |
5486 | percpu_ref_get(req->fixed_file_refs); | |
09bb8394 | 5487 | } else { |
c826bd7a | 5488 | trace_io_uring_file_get(ctx, fd); |
8da11c19 PB |
5489 | file = __io_file_get(state, fd); |
5490 | if (unlikely(!file)) | |
09bb8394 JA |
5491 | return -EBADF; |
5492 | } | |
5493 | ||
8da11c19 | 5494 | *out_file = file; |
09bb8394 JA |
5495 | return 0; |
5496 | } | |
5497 | ||
8da11c19 | 5498 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5499 | int fd) |
8da11c19 | 5500 | { |
8da11c19 PB |
5501 | bool fixed; |
5502 | ||
63ff8223 | 5503 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5504 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5505 | return -EBADF; |
5506 | ||
5507 | return io_file_get(state, req, fd, &req->file, fixed); | |
5508 | } | |
5509 | ||
a197f664 | 5510 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5511 | { |
5512 | int ret = -EBADF; | |
a197f664 | 5513 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5514 | |
5b0bbee4 | 5515 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5516 | return 0; |
b14cca0c | 5517 | if (!ctx->ring_file) |
b5dba59e JA |
5518 | return -EBADF; |
5519 | ||
fcb323cc JA |
5520 | rcu_read_lock(); |
5521 | spin_lock_irq(&ctx->inflight_lock); | |
5522 | /* | |
5523 | * We use the f_ops->flush() handler to ensure that we can flush | |
5524 | * out work accessing these files if the fd is closed. Check if | |
5525 | * the fd has changed since we started down this path, and disallow | |
5526 | * this operation if it has. | |
5527 | */ | |
b14cca0c | 5528 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5529 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5530 | req->flags |= REQ_F_INFLIGHT; | |
5531 | req->work.files = current->files; | |
5532 | ret = 0; | |
5533 | } | |
5534 | spin_unlock_irq(&ctx->inflight_lock); | |
5535 | rcu_read_unlock(); | |
5536 | ||
5537 | return ret; | |
5538 | } | |
5539 | ||
2665abfd | 5540 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5541 | { |
ad8a48ac JA |
5542 | struct io_timeout_data *data = container_of(timer, |
5543 | struct io_timeout_data, timer); | |
5544 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5545 | struct io_ring_ctx *ctx = req->ctx; |
5546 | struct io_kiocb *prev = NULL; | |
5547 | unsigned long flags; | |
2665abfd JA |
5548 | |
5549 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5550 | ||
5551 | /* | |
5552 | * We don't expect the list to be empty, that will only happen if we | |
5553 | * race with the completion of the linked work. | |
5554 | */ | |
4493233e PB |
5555 | if (!list_empty(&req->link_list)) { |
5556 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5557 | link_list); | |
5d960724 | 5558 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5559 | list_del_init(&req->link_list); |
5d960724 JA |
5560 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5561 | } else | |
76a46e06 | 5562 | prev = NULL; |
2665abfd JA |
5563 | } |
5564 | ||
5565 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5566 | ||
5567 | if (prev) { | |
4e88d6e7 | 5568 | req_set_fail_links(prev); |
014db007 | 5569 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5570 | io_put_req(prev); |
47f46768 JA |
5571 | } else { |
5572 | io_cqring_add_event(req, -ETIME); | |
5573 | io_put_req(req); | |
2665abfd | 5574 | } |
2665abfd JA |
5575 | return HRTIMER_NORESTART; |
5576 | } | |
5577 | ||
ad8a48ac | 5578 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5579 | { |
76a46e06 | 5580 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 5581 | |
76a46e06 JA |
5582 | /* |
5583 | * If the list is now empty, then our linked request finished before | |
5584 | * we got a chance to setup the timer | |
5585 | */ | |
5586 | spin_lock_irq(&ctx->completion_lock); | |
4493233e | 5587 | if (!list_empty(&req->link_list)) { |
2d28390a | 5588 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 5589 | |
ad8a48ac JA |
5590 | data->timer.function = io_link_timeout_fn; |
5591 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
5592 | data->mode); | |
2665abfd | 5593 | } |
76a46e06 | 5594 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 5595 | |
2665abfd | 5596 | /* drop submission reference */ |
76a46e06 JA |
5597 | io_put_req(req); |
5598 | } | |
2665abfd | 5599 | |
ad8a48ac | 5600 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
5601 | { |
5602 | struct io_kiocb *nxt; | |
5603 | ||
dea3b49c | 5604 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 5605 | return NULL; |
d7718a9d JA |
5606 | /* for polled retry, if flag is set, we already went through here */ |
5607 | if (req->flags & REQ_F_POLLED) | |
5608 | return NULL; | |
2665abfd | 5609 | |
4493233e PB |
5610 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
5611 | link_list); | |
d625c6ee | 5612 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 5613 | return NULL; |
2665abfd | 5614 | |
76a46e06 | 5615 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 5616 | return nxt; |
2665abfd JA |
5617 | } |
5618 | ||
3529d8c2 | 5619 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 5620 | { |
4a0a7a18 | 5621 | struct io_kiocb *linked_timeout; |
4bc4494e | 5622 | struct io_kiocb *nxt; |
193155c8 | 5623 | const struct cred *old_creds = NULL; |
e0c5c576 | 5624 | int ret; |
2b188cc1 | 5625 | |
4a0a7a18 JA |
5626 | again: |
5627 | linked_timeout = io_prep_linked_timeout(req); | |
5628 | ||
193155c8 JA |
5629 | if (req->work.creds && req->work.creds != current_cred()) { |
5630 | if (old_creds) | |
5631 | revert_creds(old_creds); | |
5632 | if (old_creds == req->work.creds) | |
5633 | old_creds = NULL; /* restored original creds */ | |
5634 | else | |
5635 | old_creds = override_creds(req->work.creds); | |
5636 | } | |
5637 | ||
014db007 | 5638 | ret = io_issue_sqe(req, sqe, true); |
491381ce JA |
5639 | |
5640 | /* | |
5641 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
5642 | * doesn't support non-blocking read/write attempts | |
5643 | */ | |
5644 | if (ret == -EAGAIN && (!(req->flags & REQ_F_NOWAIT) || | |
5645 | (req->flags & REQ_F_MUST_PUNT))) { | |
d7718a9d JA |
5646 | if (io_arm_poll_handler(req)) { |
5647 | if (linked_timeout) | |
5648 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 5649 | goto exit; |
d7718a9d | 5650 | } |
86a761f8 | 5651 | punt: |
f86cd20c | 5652 | if (io_op_defs[req->opcode].file_table) { |
bbad27b2 PB |
5653 | ret = io_grab_files(req); |
5654 | if (ret) | |
5655 | goto err; | |
2b188cc1 | 5656 | } |
bbad27b2 PB |
5657 | |
5658 | /* | |
5659 | * Queued up for async execution, worker will release | |
5660 | * submit reference when the iocb is actually submitted. | |
5661 | */ | |
5662 | io_queue_async_work(req); | |
4bc4494e | 5663 | goto exit; |
2b188cc1 | 5664 | } |
e65ef56d | 5665 | |
fcb323cc | 5666 | err: |
4bc4494e | 5667 | nxt = NULL; |
76a46e06 | 5668 | /* drop submission reference */ |
2a44f467 | 5669 | io_put_req_find_next(req, &nxt); |
e65ef56d | 5670 | |
f9bd67f6 | 5671 | if (linked_timeout) { |
76a46e06 | 5672 | if (!ret) |
f9bd67f6 | 5673 | io_queue_linked_timeout(linked_timeout); |
76a46e06 | 5674 | else |
f9bd67f6 | 5675 | io_put_req(linked_timeout); |
76a46e06 JA |
5676 | } |
5677 | ||
e65ef56d | 5678 | /* and drop final reference, if we failed */ |
9e645e11 | 5679 | if (ret) { |
78e19bbe | 5680 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5681 | req_set_fail_links(req); |
e65ef56d | 5682 | io_put_req(req); |
9e645e11 | 5683 | } |
4a0a7a18 JA |
5684 | if (nxt) { |
5685 | req = nxt; | |
86a761f8 PB |
5686 | |
5687 | if (req->flags & REQ_F_FORCE_ASYNC) | |
5688 | goto punt; | |
4a0a7a18 JA |
5689 | goto again; |
5690 | } | |
4bc4494e | 5691 | exit: |
193155c8 JA |
5692 | if (old_creds) |
5693 | revert_creds(old_creds); | |
2b188cc1 JA |
5694 | } |
5695 | ||
3529d8c2 | 5696 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
5697 | { |
5698 | int ret; | |
5699 | ||
3529d8c2 | 5700 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
5701 | if (ret) { |
5702 | if (ret != -EIOCBQUEUED) { | |
1118591a | 5703 | fail_req: |
78e19bbe | 5704 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5705 | req_set_fail_links(req); |
78e19bbe | 5706 | io_double_put_req(req); |
4fe2c963 | 5707 | } |
2550878f | 5708 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
1118591a PB |
5709 | ret = io_req_defer_prep(req, sqe); |
5710 | if (unlikely(ret < 0)) | |
5711 | goto fail_req; | |
ce35a47a JA |
5712 | /* |
5713 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
5714 | * to async execution. | |
5715 | */ | |
5716 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
5717 | io_queue_async_work(req); | |
5718 | } else { | |
3529d8c2 | 5719 | __io_queue_sqe(req, sqe); |
ce35a47a | 5720 | } |
4fe2c963 JL |
5721 | } |
5722 | ||
1b4a51b6 | 5723 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 5724 | { |
94ae5e77 | 5725 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
1b4a51b6 PB |
5726 | io_cqring_add_event(req, -ECANCELED); |
5727 | io_double_put_req(req); | |
5728 | } else | |
3529d8c2 | 5729 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
5730 | } |
5731 | ||
1d4240cc | 5732 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
7d01bd74 | 5733 | struct io_kiocb **link) |
9e645e11 | 5734 | { |
a197f664 | 5735 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 5736 | int ret; |
9e645e11 | 5737 | |
9e645e11 JA |
5738 | /* |
5739 | * If we already have a head request, queue this one for async | |
5740 | * submittal once the head completes. If we don't have a head but | |
5741 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
5742 | * submitted sync once the chain is complete. If none of those | |
5743 | * conditions are true (normal request), then just queue it. | |
5744 | */ | |
5745 | if (*link) { | |
9d76377f | 5746 | struct io_kiocb *head = *link; |
4e88d6e7 | 5747 | |
8cdf2193 PB |
5748 | /* |
5749 | * Taking sequential execution of a link, draining both sides | |
5750 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
5751 | * requests in the link. So, it drains the head and the | |
5752 | * next after the link request. The last one is done via | |
5753 | * drain_next flag to persist the effect across calls. | |
5754 | */ | |
ef4ff581 | 5755 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
5756 | head->flags |= REQ_F_IO_DRAIN; |
5757 | ctx->drain_next = 1; | |
5758 | } | |
1d4240cc PB |
5759 | if (io_alloc_async_ctx(req)) |
5760 | return -EAGAIN; | |
9e645e11 | 5761 | |
3529d8c2 | 5762 | ret = io_req_defer_prep(req, sqe); |
2d28390a | 5763 | if (ret) { |
4e88d6e7 | 5764 | /* fail even hard links since we don't submit */ |
9d76377f | 5765 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 5766 | return ret; |
2d28390a | 5767 | } |
9d76377f PB |
5768 | trace_io_uring_link(ctx, req, head); |
5769 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
5770 | |
5771 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 5772 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
32fe525b PB |
5773 | io_queue_link_head(head); |
5774 | *link = NULL; | |
5775 | } | |
9e645e11 | 5776 | } else { |
711be031 PB |
5777 | if (unlikely(ctx->drain_next)) { |
5778 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 5779 | ctx->drain_next = 0; |
711be031 | 5780 | } |
ef4ff581 | 5781 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 5782 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 5783 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 5784 | |
1d4240cc PB |
5785 | if (io_alloc_async_ctx(req)) |
5786 | return -EAGAIN; | |
5787 | ||
711be031 PB |
5788 | ret = io_req_defer_prep(req, sqe); |
5789 | if (ret) | |
5790 | req->flags |= REQ_F_FAIL_LINK; | |
5791 | *link = req; | |
5792 | } else { | |
5793 | io_queue_sqe(req, sqe); | |
5794 | } | |
9e645e11 | 5795 | } |
2e6e1fde | 5796 | |
1d4240cc | 5797 | return 0; |
9e645e11 JA |
5798 | } |
5799 | ||
9a56a232 JA |
5800 | /* |
5801 | * Batched submission is done, ensure local IO is flushed out. | |
5802 | */ | |
5803 | static void io_submit_state_end(struct io_submit_state *state) | |
5804 | { | |
5805 | blk_finish_plug(&state->plug); | |
9f13c35b | 5806 | io_state_file_put(state); |
2579f913 | 5807 | if (state->free_reqs) |
6c8a3134 | 5808 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
5809 | } |
5810 | ||
5811 | /* | |
5812 | * Start submission side cache. | |
5813 | */ | |
5814 | static void io_submit_state_start(struct io_submit_state *state, | |
22efde59 | 5815 | unsigned int max_ios) |
9a56a232 JA |
5816 | { |
5817 | blk_start_plug(&state->plug); | |
2579f913 | 5818 | state->free_reqs = 0; |
9a56a232 JA |
5819 | state->file = NULL; |
5820 | state->ios_left = max_ios; | |
5821 | } | |
5822 | ||
2b188cc1 JA |
5823 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
5824 | { | |
75b28aff | 5825 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 5826 | |
caf582c6 PB |
5827 | /* |
5828 | * Ensure any loads from the SQEs are done at this point, | |
5829 | * since once we write the new head, the application could | |
5830 | * write new data to them. | |
5831 | */ | |
5832 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
5833 | } |
5834 | ||
2b188cc1 | 5835 | /* |
3529d8c2 | 5836 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
5837 | * that is mapped by userspace. This means that care needs to be taken to |
5838 | * ensure that reads are stable, as we cannot rely on userspace always | |
5839 | * being a good citizen. If members of the sqe are validated and then later | |
5840 | * used, it's important that those reads are done through READ_ONCE() to | |
5841 | * prevent a re-load down the line. | |
5842 | */ | |
709b302f | 5843 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 5844 | { |
75b28aff | 5845 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
5846 | unsigned head; |
5847 | ||
5848 | /* | |
5849 | * The cached sq head (or cq tail) serves two purposes: | |
5850 | * | |
5851 | * 1) allows us to batch the cost of updating the user visible | |
5852 | * head updates. | |
5853 | * 2) allows the kernel side to track the head on its own, even | |
5854 | * though the application is the one updating it. | |
5855 | */ | |
ee7d46d9 | 5856 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
5857 | if (likely(head < ctx->sq_entries)) |
5858 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
5859 | |
5860 | /* drop invalid entries */ | |
498ccd9e | 5861 | ctx->cached_sq_dropped++; |
ee7d46d9 | 5862 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
5863 | return NULL; |
5864 | } | |
5865 | ||
5866 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
5867 | { | |
5868 | ctx->cached_sq_head++; | |
2b188cc1 JA |
5869 | } |
5870 | ||
ef4ff581 PB |
5871 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
5872 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
5873 | IOSQE_BUFFER_SELECT) | |
5874 | ||
5875 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
5876 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 5877 | struct io_submit_state *state) |
0553b8bd | 5878 | { |
ef4ff581 | 5879 | unsigned int sqe_flags; |
63ff8223 | 5880 | int id; |
ef4ff581 | 5881 | |
0553b8bd PB |
5882 | /* |
5883 | * All io need record the previous position, if LINK vs DARIN, | |
5884 | * it can be used to mark the position of the first IO in the | |
5885 | * link list. | |
5886 | */ | |
31af27c7 | 5887 | req->sequence = ctx->cached_sq_head - ctx->cached_sq_dropped; |
0553b8bd PB |
5888 | req->opcode = READ_ONCE(sqe->opcode); |
5889 | req->user_data = READ_ONCE(sqe->user_data); | |
5890 | req->io = NULL; | |
5891 | req->file = NULL; | |
5892 | req->ctx = ctx; | |
5893 | req->flags = 0; | |
5894 | /* one is dropped after submission, the other at completion */ | |
5895 | refcount_set(&req->refs, 2); | |
5896 | req->task = NULL; | |
5897 | req->result = 0; | |
5898 | INIT_IO_WORK(&req->work, io_wq_submit_work); | |
ef4ff581 PB |
5899 | |
5900 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
5901 | return -EINVAL; | |
5902 | ||
5903 | if (io_op_defs[req->opcode].needs_mm && !current->mm) { | |
5904 | if (unlikely(!mmget_not_zero(ctx->sqo_mm))) | |
5905 | return -EFAULT; | |
5906 | use_mm(ctx->sqo_mm); | |
5907 | } | |
5908 | ||
5909 | sqe_flags = READ_ONCE(sqe->flags); | |
5910 | /* enforce forwards compatibility on users */ | |
5911 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
5912 | return -EINVAL; | |
5913 | ||
5914 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
5915 | !io_op_defs[req->opcode].buffer_select) | |
5916 | return -EOPNOTSUPP; | |
5917 | ||
5918 | id = READ_ONCE(sqe->personality); | |
5919 | if (id) { | |
5920 | req->work.creds = idr_find(&ctx->personality_idr, id); | |
5921 | if (unlikely(!req->work.creds)) | |
5922 | return -EINVAL; | |
5923 | get_cred(req->work.creds); | |
5924 | } | |
5925 | ||
5926 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 5927 | req->flags |= sqe_flags; |
ef4ff581 | 5928 | |
63ff8223 JA |
5929 | if (!io_op_defs[req->opcode].needs_file) |
5930 | return 0; | |
5931 | ||
5932 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
5933 | } |
5934 | ||
fb5ccc98 | 5935 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 5936 | struct file *ring_file, int ring_fd) |
6c271ce2 JA |
5937 | { |
5938 | struct io_submit_state state, *statep = NULL; | |
9e645e11 | 5939 | struct io_kiocb *link = NULL; |
9e645e11 | 5940 | int i, submitted = 0; |
6c271ce2 | 5941 | |
c4a2ed72 | 5942 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
5943 | if (test_bit(0, &ctx->sq_check_overflow)) { |
5944 | if (!list_empty(&ctx->cq_overflow_list) && | |
5945 | !io_cqring_overflow_flush(ctx, false)) | |
5946 | return -EBUSY; | |
5947 | } | |
6c271ce2 | 5948 | |
ee7d46d9 PB |
5949 | /* make sure SQ entry isn't read before tail */ |
5950 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 5951 | |
2b85edfc PB |
5952 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
5953 | return -EAGAIN; | |
6c271ce2 JA |
5954 | |
5955 | if (nr > IO_PLUG_THRESHOLD) { | |
22efde59 | 5956 | io_submit_state_start(&state, nr); |
6c271ce2 JA |
5957 | statep = &state; |
5958 | } | |
5959 | ||
b14cca0c PB |
5960 | ctx->ring_fd = ring_fd; |
5961 | ctx->ring_file = ring_file; | |
5962 | ||
6c271ce2 | 5963 | for (i = 0; i < nr; i++) { |
3529d8c2 | 5964 | const struct io_uring_sqe *sqe; |
196be95c | 5965 | struct io_kiocb *req; |
1cb1edb2 | 5966 | int err; |
fb5ccc98 | 5967 | |
b1e50e54 PB |
5968 | sqe = io_get_sqe(ctx); |
5969 | if (unlikely(!sqe)) { | |
5970 | io_consume_sqe(ctx); | |
5971 | break; | |
5972 | } | |
0553b8bd | 5973 | req = io_alloc_req(ctx, statep); |
196be95c PB |
5974 | if (unlikely(!req)) { |
5975 | if (!submitted) | |
5976 | submitted = -EAGAIN; | |
fb5ccc98 | 5977 | break; |
196be95c | 5978 | } |
fb5ccc98 | 5979 | |
0cdaf760 | 5980 | err = io_init_req(ctx, req, sqe, statep); |
709b302f | 5981 | io_consume_sqe(ctx); |
d3656344 JA |
5982 | /* will complete beyond this point, count as submitted */ |
5983 | submitted++; | |
5984 | ||
ef4ff581 | 5985 | if (unlikely(err)) { |
1cb1edb2 PB |
5986 | fail_req: |
5987 | io_cqring_add_event(req, err); | |
d3656344 | 5988 | io_double_put_req(req); |
196be95c PB |
5989 | break; |
5990 | } | |
fb5ccc98 | 5991 | |
354420f7 | 5992 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 5993 | true, io_async_submit(ctx)); |
7d01bd74 | 5994 | err = io_submit_sqe(req, sqe, &link); |
1d4240cc PB |
5995 | if (err) |
5996 | goto fail_req; | |
6c271ce2 JA |
5997 | } |
5998 | ||
9466f437 PB |
5999 | if (unlikely(submitted != nr)) { |
6000 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6001 | ||
6002 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6003 | } | |
9e645e11 | 6004 | if (link) |
1b4a51b6 | 6005 | io_queue_link_head(link); |
6c271ce2 JA |
6006 | if (statep) |
6007 | io_submit_state_end(&state); | |
6008 | ||
ae9428ca PB |
6009 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6010 | io_commit_sqring(ctx); | |
6011 | ||
6c271ce2 JA |
6012 | return submitted; |
6013 | } | |
6014 | ||
bf9c2f1c PB |
6015 | static inline void io_sq_thread_drop_mm(struct io_ring_ctx *ctx) |
6016 | { | |
6017 | struct mm_struct *mm = current->mm; | |
6018 | ||
6019 | if (mm) { | |
6020 | unuse_mm(mm); | |
6021 | mmput(mm); | |
6022 | } | |
6023 | } | |
6024 | ||
6c271ce2 JA |
6025 | static int io_sq_thread(void *data) |
6026 | { | |
6c271ce2 | 6027 | struct io_ring_ctx *ctx = data; |
181e448d | 6028 | const struct cred *old_cred; |
6c271ce2 JA |
6029 | mm_segment_t old_fs; |
6030 | DEFINE_WAIT(wait); | |
6c271ce2 | 6031 | unsigned long timeout; |
bdcd3eab | 6032 | int ret = 0; |
6c271ce2 | 6033 | |
0f158b4c | 6034 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6035 | |
6c271ce2 JA |
6036 | old_fs = get_fs(); |
6037 | set_fs(USER_DS); | |
181e448d | 6038 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6039 | |
bdcd3eab | 6040 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6041 | while (!kthread_should_park()) { |
fb5ccc98 | 6042 | unsigned int to_submit; |
6c271ce2 | 6043 | |
bdcd3eab | 6044 | if (!list_empty(&ctx->poll_list)) { |
6c271ce2 JA |
6045 | unsigned nr_events = 0; |
6046 | ||
bdcd3eab XW |
6047 | mutex_lock(&ctx->uring_lock); |
6048 | if (!list_empty(&ctx->poll_list)) | |
6049 | io_iopoll_getevents(ctx, &nr_events, 0); | |
6050 | else | |
6c271ce2 | 6051 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6052 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6053 | } |
6054 | ||
fb5ccc98 | 6055 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6056 | |
6057 | /* | |
6058 | * If submit got -EBUSY, flag us as needing the application | |
6059 | * to enter the kernel to reap and flush events. | |
6060 | */ | |
6061 | if (!to_submit || ret == -EBUSY) { | |
7143b5ac SG |
6062 | /* |
6063 | * Drop cur_mm before scheduling, we can't hold it for | |
6064 | * long periods (or over schedule()). Do this before | |
6065 | * adding ourselves to the waitqueue, as the unuse/drop | |
6066 | * may sleep. | |
6067 | */ | |
bf9c2f1c | 6068 | io_sq_thread_drop_mm(ctx); |
7143b5ac | 6069 | |
6c271ce2 JA |
6070 | /* |
6071 | * We're polling. If we're within the defined idle | |
6072 | * period, then let us spin without work before going | |
c1edbf5f JA |
6073 | * to sleep. The exception is if we got EBUSY doing |
6074 | * more IO, we should wait for the application to | |
6075 | * reap events and wake us up. | |
6c271ce2 | 6076 | */ |
bdcd3eab | 6077 | if (!list_empty(&ctx->poll_list) || |
df069d80 JA |
6078 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6079 | !percpu_ref_is_dying(&ctx->refs))) { | |
b41e9852 JA |
6080 | if (current->task_works) |
6081 | task_work_run(); | |
9831a90c | 6082 | cond_resched(); |
6c271ce2 JA |
6083 | continue; |
6084 | } | |
6085 | ||
6c271ce2 JA |
6086 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6087 | TASK_INTERRUPTIBLE); | |
6088 | ||
bdcd3eab XW |
6089 | /* |
6090 | * While doing polled IO, before going to sleep, we need | |
6091 | * to check if there are new reqs added to poll_list, it | |
6092 | * is because reqs may have been punted to io worker and | |
6093 | * will be added to poll_list later, hence check the | |
6094 | * poll_list again. | |
6095 | */ | |
6096 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6097 | !list_empty_careful(&ctx->poll_list)) { | |
6098 | finish_wait(&ctx->sqo_wait, &wait); | |
6099 | continue; | |
6100 | } | |
6101 | ||
6c271ce2 | 6102 | /* Tell userspace we may need a wakeup call */ |
75b28aff | 6103 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; |
0d7bae69 SB |
6104 | /* make sure to read SQ tail after writing flags */ |
6105 | smp_mb(); | |
6c271ce2 | 6106 | |
fb5ccc98 | 6107 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6108 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6109 | if (kthread_should_park()) { |
6c271ce2 JA |
6110 | finish_wait(&ctx->sqo_wait, &wait); |
6111 | break; | |
6112 | } | |
b41e9852 JA |
6113 | if (current->task_works) { |
6114 | task_work_run(); | |
10bea96d | 6115 | finish_wait(&ctx->sqo_wait, &wait); |
b41e9852 JA |
6116 | continue; |
6117 | } | |
6c271ce2 JA |
6118 | if (signal_pending(current)) |
6119 | flush_signals(current); | |
6120 | schedule(); | |
6121 | finish_wait(&ctx->sqo_wait, &wait); | |
6122 | ||
75b28aff | 6123 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
6124 | continue; |
6125 | } | |
6126 | finish_wait(&ctx->sqo_wait, &wait); | |
6127 | ||
75b28aff | 6128 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
6129 | } |
6130 | ||
8a4955ff | 6131 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6132 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6133 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6134 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6135 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6136 | } |
6137 | ||
b41e9852 JA |
6138 | if (current->task_works) |
6139 | task_work_run(); | |
6140 | ||
6c271ce2 | 6141 | set_fs(old_fs); |
bf9c2f1c | 6142 | io_sq_thread_drop_mm(ctx); |
181e448d | 6143 | revert_creds(old_cred); |
06058632 | 6144 | |
2bbcd6d3 | 6145 | kthread_parkme(); |
06058632 | 6146 | |
6c271ce2 JA |
6147 | return 0; |
6148 | } | |
6149 | ||
bda52162 JA |
6150 | struct io_wait_queue { |
6151 | struct wait_queue_entry wq; | |
6152 | struct io_ring_ctx *ctx; | |
6153 | unsigned to_wait; | |
6154 | unsigned nr_timeouts; | |
6155 | }; | |
6156 | ||
1d7bb1d5 | 6157 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6158 | { |
6159 | struct io_ring_ctx *ctx = iowq->ctx; | |
6160 | ||
6161 | /* | |
d195a66e | 6162 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6163 | * started waiting. For timeouts, we always want to return to userspace, |
6164 | * regardless of event count. | |
6165 | */ | |
1d7bb1d5 | 6166 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6167 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6168 | } | |
6169 | ||
6170 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6171 | int wake_flags, void *key) | |
6172 | { | |
6173 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6174 | wq); | |
6175 | ||
1d7bb1d5 JA |
6176 | /* use noflush == true, as we can't safely rely on locking context */ |
6177 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6178 | return -1; |
6179 | ||
6180 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6181 | } | |
6182 | ||
2b188cc1 JA |
6183 | /* |
6184 | * Wait until events become available, if we don't already have some. The | |
6185 | * application must reap them itself, as they reside on the shared cq ring. | |
6186 | */ | |
6187 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6188 | const sigset_t __user *sig, size_t sigsz) | |
6189 | { | |
bda52162 JA |
6190 | struct io_wait_queue iowq = { |
6191 | .wq = { | |
6192 | .private = current, | |
6193 | .func = io_wake_function, | |
6194 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6195 | }, | |
6196 | .ctx = ctx, | |
6197 | .to_wait = min_events, | |
6198 | }; | |
75b28aff | 6199 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6200 | int ret = 0; |
2b188cc1 | 6201 | |
b41e9852 JA |
6202 | do { |
6203 | if (io_cqring_events(ctx, false) >= min_events) | |
6204 | return 0; | |
6205 | if (!current->task_works) | |
6206 | break; | |
6207 | task_work_run(); | |
6208 | } while (1); | |
2b188cc1 JA |
6209 | |
6210 | if (sig) { | |
9e75ad5d AB |
6211 | #ifdef CONFIG_COMPAT |
6212 | if (in_compat_syscall()) | |
6213 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6214 | sigsz); |
9e75ad5d AB |
6215 | else |
6216 | #endif | |
b772434b | 6217 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6218 | |
2b188cc1 JA |
6219 | if (ret) |
6220 | return ret; | |
6221 | } | |
6222 | ||
bda52162 | 6223 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6224 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6225 | do { |
6226 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6227 | TASK_INTERRUPTIBLE); | |
b41e9852 JA |
6228 | if (current->task_works) |
6229 | task_work_run(); | |
1d7bb1d5 | 6230 | if (io_should_wake(&iowq, false)) |
bda52162 JA |
6231 | break; |
6232 | schedule(); | |
6233 | if (signal_pending(current)) { | |
e9ffa5c2 | 6234 | ret = -EINTR; |
bda52162 JA |
6235 | break; |
6236 | } | |
6237 | } while (1); | |
6238 | finish_wait(&ctx->wait, &iowq.wq); | |
6239 | ||
e9ffa5c2 | 6240 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6241 | |
75b28aff | 6242 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6243 | } |
6244 | ||
6b06314c JA |
6245 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6246 | { | |
6247 | #if defined(CONFIG_UNIX) | |
6248 | if (ctx->ring_sock) { | |
6249 | struct sock *sock = ctx->ring_sock->sk; | |
6250 | struct sk_buff *skb; | |
6251 | ||
6252 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6253 | kfree_skb(skb); | |
6254 | } | |
6255 | #else | |
6256 | int i; | |
6257 | ||
65e19f54 JA |
6258 | for (i = 0; i < ctx->nr_user_files; i++) { |
6259 | struct file *file; | |
6260 | ||
6261 | file = io_file_from_index(ctx, i); | |
6262 | if (file) | |
6263 | fput(file); | |
6264 | } | |
6b06314c JA |
6265 | #endif |
6266 | } | |
6267 | ||
05f3fb3c JA |
6268 | static void io_file_ref_kill(struct percpu_ref *ref) |
6269 | { | |
6270 | struct fixed_file_data *data; | |
6271 | ||
6272 | data = container_of(ref, struct fixed_file_data, refs); | |
6273 | complete(&data->done); | |
6274 | } | |
6275 | ||
6b06314c JA |
6276 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6277 | { | |
05f3fb3c | 6278 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6279 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6280 | unsigned nr_tables, i; |
6281 | ||
05f3fb3c | 6282 | if (!data) |
6b06314c JA |
6283 | return -ENXIO; |
6284 | ||
6a4d07cd | 6285 | spin_lock(&data->lock); |
05589553 XW |
6286 | if (!list_empty(&data->ref_list)) |
6287 | ref_node = list_first_entry(&data->ref_list, | |
6288 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6289 | spin_unlock(&data->lock); |
05589553 XW |
6290 | if (ref_node) |
6291 | percpu_ref_kill(&ref_node->refs); | |
6292 | ||
6293 | percpu_ref_kill(&data->refs); | |
6294 | ||
6295 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6296 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6297 | wait_for_completion(&data->done); |
05f3fb3c | 6298 | |
6b06314c | 6299 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6300 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6301 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6302 | kfree(data->table[i].files); |
6303 | kfree(data->table); | |
05589553 XW |
6304 | percpu_ref_exit(&data->refs); |
6305 | kfree(data); | |
05f3fb3c | 6306 | ctx->file_data = NULL; |
6b06314c JA |
6307 | ctx->nr_user_files = 0; |
6308 | return 0; | |
6309 | } | |
6310 | ||
6c271ce2 JA |
6311 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6312 | { | |
6313 | if (ctx->sqo_thread) { | |
0f158b4c | 6314 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6315 | /* |
6316 | * The park is a bit of a work-around, without it we get | |
6317 | * warning spews on shutdown with SQPOLL set and affinity | |
6318 | * set to a single CPU. | |
6319 | */ | |
06058632 | 6320 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6321 | kthread_stop(ctx->sqo_thread); |
6322 | ctx->sqo_thread = NULL; | |
6323 | } | |
6324 | } | |
6325 | ||
6b06314c JA |
6326 | static void io_finish_async(struct io_ring_ctx *ctx) |
6327 | { | |
6c271ce2 JA |
6328 | io_sq_thread_stop(ctx); |
6329 | ||
561fb04a JA |
6330 | if (ctx->io_wq) { |
6331 | io_wq_destroy(ctx->io_wq); | |
6332 | ctx->io_wq = NULL; | |
6b06314c JA |
6333 | } |
6334 | } | |
6335 | ||
6336 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6337 | /* |
6338 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6339 | * the io_uring can be safely unregistered on process exit, even if we have | |
6340 | * loops in the file referencing. | |
6341 | */ | |
6342 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6343 | { | |
6344 | struct sock *sk = ctx->ring_sock->sk; | |
6345 | struct scm_fp_list *fpl; | |
6346 | struct sk_buff *skb; | |
08a45173 | 6347 | int i, nr_files; |
6b06314c | 6348 | |
6b06314c JA |
6349 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6350 | if (!fpl) | |
6351 | return -ENOMEM; | |
6352 | ||
6353 | skb = alloc_skb(0, GFP_KERNEL); | |
6354 | if (!skb) { | |
6355 | kfree(fpl); | |
6356 | return -ENOMEM; | |
6357 | } | |
6358 | ||
6359 | skb->sk = sk; | |
6b06314c | 6360 | |
08a45173 | 6361 | nr_files = 0; |
6b06314c JA |
6362 | fpl->user = get_uid(ctx->user); |
6363 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6364 | struct file *file = io_file_from_index(ctx, i + offset); |
6365 | ||
6366 | if (!file) | |
08a45173 | 6367 | continue; |
65e19f54 | 6368 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6369 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6370 | nr_files++; | |
6b06314c JA |
6371 | } |
6372 | ||
08a45173 JA |
6373 | if (nr_files) { |
6374 | fpl->max = SCM_MAX_FD; | |
6375 | fpl->count = nr_files; | |
6376 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6377 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6378 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6379 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6380 | |
08a45173 JA |
6381 | for (i = 0; i < nr_files; i++) |
6382 | fput(fpl->fp[i]); | |
6383 | } else { | |
6384 | kfree_skb(skb); | |
6385 | kfree(fpl); | |
6386 | } | |
6b06314c JA |
6387 | |
6388 | return 0; | |
6389 | } | |
6390 | ||
6391 | /* | |
6392 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6393 | * causes regular reference counting to break down. We rely on the UNIX | |
6394 | * garbage collection to take care of this problem for us. | |
6395 | */ | |
6396 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6397 | { | |
6398 | unsigned left, total; | |
6399 | int ret = 0; | |
6400 | ||
6401 | total = 0; | |
6402 | left = ctx->nr_user_files; | |
6403 | while (left) { | |
6404 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6405 | |
6406 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6407 | if (ret) | |
6408 | break; | |
6409 | left -= this_files; | |
6410 | total += this_files; | |
6411 | } | |
6412 | ||
6413 | if (!ret) | |
6414 | return 0; | |
6415 | ||
6416 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6417 | struct file *file = io_file_from_index(ctx, total); |
6418 | ||
6419 | if (file) | |
6420 | fput(file); | |
6b06314c JA |
6421 | total++; |
6422 | } | |
6423 | ||
6424 | return ret; | |
6425 | } | |
6426 | #else | |
6427 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6428 | { | |
6429 | return 0; | |
6430 | } | |
6431 | #endif | |
6432 | ||
65e19f54 JA |
6433 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6434 | unsigned nr_files) | |
6435 | { | |
6436 | int i; | |
6437 | ||
6438 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6439 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6440 | unsigned this_files; |
6441 | ||
6442 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6443 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6444 | GFP_KERNEL); | |
6445 | if (!table->files) | |
6446 | break; | |
6447 | nr_files -= this_files; | |
6448 | } | |
6449 | ||
6450 | if (i == nr_tables) | |
6451 | return 0; | |
6452 | ||
6453 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6454 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6455 | kfree(table->files); |
6456 | } | |
6457 | return 1; | |
6458 | } | |
6459 | ||
05f3fb3c JA |
6460 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6461 | { | |
6462 | #if defined(CONFIG_UNIX) | |
6463 | struct sock *sock = ctx->ring_sock->sk; | |
6464 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6465 | struct sk_buff *skb; | |
6466 | int i; | |
6467 | ||
6468 | __skb_queue_head_init(&list); | |
6469 | ||
6470 | /* | |
6471 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6472 | * remove this entry and rearrange the file array. | |
6473 | */ | |
6474 | skb = skb_dequeue(head); | |
6475 | while (skb) { | |
6476 | struct scm_fp_list *fp; | |
6477 | ||
6478 | fp = UNIXCB(skb).fp; | |
6479 | for (i = 0; i < fp->count; i++) { | |
6480 | int left; | |
6481 | ||
6482 | if (fp->fp[i] != file) | |
6483 | continue; | |
6484 | ||
6485 | unix_notinflight(fp->user, fp->fp[i]); | |
6486 | left = fp->count - 1 - i; | |
6487 | if (left) { | |
6488 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6489 | left * sizeof(struct file *)); | |
6490 | } | |
6491 | fp->count--; | |
6492 | if (!fp->count) { | |
6493 | kfree_skb(skb); | |
6494 | skb = NULL; | |
6495 | } else { | |
6496 | __skb_queue_tail(&list, skb); | |
6497 | } | |
6498 | fput(file); | |
6499 | file = NULL; | |
6500 | break; | |
6501 | } | |
6502 | ||
6503 | if (!file) | |
6504 | break; | |
6505 | ||
6506 | __skb_queue_tail(&list, skb); | |
6507 | ||
6508 | skb = skb_dequeue(head); | |
6509 | } | |
6510 | ||
6511 | if (skb_peek(&list)) { | |
6512 | spin_lock_irq(&head->lock); | |
6513 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6514 | __skb_queue_tail(head, skb); | |
6515 | spin_unlock_irq(&head->lock); | |
6516 | } | |
6517 | #else | |
6518 | fput(file); | |
6519 | #endif | |
6520 | } | |
6521 | ||
6522 | struct io_file_put { | |
05589553 | 6523 | struct list_head list; |
05f3fb3c | 6524 | struct file *file; |
05f3fb3c JA |
6525 | }; |
6526 | ||
4a38aed2 | 6527 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6528 | { |
4a38aed2 JA |
6529 | struct fixed_file_data *file_data = ref_node->file_data; |
6530 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6531 | struct io_file_put *pfile, *tmp; |
65e19f54 | 6532 | |
05589553 | 6533 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { |
6a4d07cd | 6534 | list_del(&pfile->list); |
05589553 XW |
6535 | io_ring_file_put(ctx, pfile->file); |
6536 | kfree(pfile); | |
65e19f54 | 6537 | } |
05589553 | 6538 | |
6a4d07cd JA |
6539 | spin_lock(&file_data->lock); |
6540 | list_del(&ref_node->node); | |
6541 | spin_unlock(&file_data->lock); | |
05589553 XW |
6542 | |
6543 | percpu_ref_exit(&ref_node->refs); | |
6544 | kfree(ref_node); | |
6545 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6546 | } |
65e19f54 | 6547 | |
4a38aed2 JA |
6548 | static void io_file_put_work(struct work_struct *work) |
6549 | { | |
6550 | struct io_ring_ctx *ctx; | |
6551 | struct llist_node *node; | |
6552 | ||
6553 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6554 | node = llist_del_all(&ctx->file_put_llist); | |
6555 | ||
6556 | while (node) { | |
6557 | struct fixed_file_ref_node *ref_node; | |
6558 | struct llist_node *next = node->next; | |
6559 | ||
6560 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6561 | __io_file_put_work(ref_node); | |
6562 | node = next; | |
6563 | } | |
6564 | } | |
6565 | ||
05589553 | 6566 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6567 | { |
05589553 | 6568 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
6569 | struct io_ring_ctx *ctx; |
6570 | bool first_add; | |
6571 | int delay = HZ; | |
65e19f54 | 6572 | |
05589553 | 6573 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 6574 | ctx = ref_node->file_data->ctx; |
05589553 | 6575 | |
4a38aed2 JA |
6576 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
6577 | delay = 0; | |
6578 | ||
6579 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); | |
6580 | if (!delay) | |
6581 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
6582 | else if (first_add) | |
6583 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 6584 | } |
65e19f54 | 6585 | |
05589553 XW |
6586 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
6587 | struct io_ring_ctx *ctx) | |
05f3fb3c | 6588 | { |
05589553 | 6589 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6590 | |
05589553 XW |
6591 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
6592 | if (!ref_node) | |
6593 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 6594 | |
05589553 XW |
6595 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
6596 | 0, GFP_KERNEL)) { | |
6597 | kfree(ref_node); | |
6598 | return ERR_PTR(-ENOMEM); | |
6599 | } | |
6600 | INIT_LIST_HEAD(&ref_node->node); | |
6601 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
6602 | ref_node->file_data = ctx->file_data; |
6603 | return ref_node; | |
05589553 XW |
6604 | } |
6605 | ||
6606 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
6607 | { | |
6608 | percpu_ref_exit(&ref_node->refs); | |
6609 | kfree(ref_node); | |
65e19f54 JA |
6610 | } |
6611 | ||
6b06314c JA |
6612 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
6613 | unsigned nr_args) | |
6614 | { | |
6615 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 6616 | unsigned nr_tables; |
05f3fb3c | 6617 | struct file *file; |
6b06314c JA |
6618 | int fd, ret = 0; |
6619 | unsigned i; | |
05589553 | 6620 | struct fixed_file_ref_node *ref_node; |
6b06314c | 6621 | |
05f3fb3c | 6622 | if (ctx->file_data) |
6b06314c JA |
6623 | return -EBUSY; |
6624 | if (!nr_args) | |
6625 | return -EINVAL; | |
6626 | if (nr_args > IORING_MAX_FIXED_FILES) | |
6627 | return -EMFILE; | |
6628 | ||
05f3fb3c JA |
6629 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
6630 | if (!ctx->file_data) | |
6631 | return -ENOMEM; | |
6632 | ctx->file_data->ctx = ctx; | |
6633 | init_completion(&ctx->file_data->done); | |
05589553 | 6634 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 6635 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 6636 | |
65e19f54 | 6637 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
6638 | ctx->file_data->table = kcalloc(nr_tables, |
6639 | sizeof(struct fixed_file_table), | |
65e19f54 | 6640 | GFP_KERNEL); |
05f3fb3c JA |
6641 | if (!ctx->file_data->table) { |
6642 | kfree(ctx->file_data); | |
6643 | ctx->file_data = NULL; | |
6b06314c | 6644 | return -ENOMEM; |
05f3fb3c JA |
6645 | } |
6646 | ||
05589553 | 6647 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
6648 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
6649 | kfree(ctx->file_data->table); | |
6650 | kfree(ctx->file_data); | |
6651 | ctx->file_data = NULL; | |
6b06314c | 6652 | return -ENOMEM; |
05f3fb3c | 6653 | } |
6b06314c | 6654 | |
65e19f54 | 6655 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
6656 | percpu_ref_exit(&ctx->file_data->refs); |
6657 | kfree(ctx->file_data->table); | |
6658 | kfree(ctx->file_data); | |
6659 | ctx->file_data = NULL; | |
65e19f54 JA |
6660 | return -ENOMEM; |
6661 | } | |
6662 | ||
08a45173 | 6663 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
6664 | struct fixed_file_table *table; |
6665 | unsigned index; | |
6666 | ||
6b06314c JA |
6667 | ret = -EFAULT; |
6668 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
6669 | break; | |
08a45173 JA |
6670 | /* allow sparse sets */ |
6671 | if (fd == -1) { | |
6672 | ret = 0; | |
6673 | continue; | |
6674 | } | |
6b06314c | 6675 | |
05f3fb3c | 6676 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 6677 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 6678 | file = fget(fd); |
6b06314c JA |
6679 | |
6680 | ret = -EBADF; | |
05f3fb3c | 6681 | if (!file) |
6b06314c | 6682 | break; |
05f3fb3c | 6683 | |
6b06314c JA |
6684 | /* |
6685 | * Don't allow io_uring instances to be registered. If UNIX | |
6686 | * isn't enabled, then this causes a reference cycle and this | |
6687 | * instance can never get freed. If UNIX is enabled we'll | |
6688 | * handle it just fine, but there's still no point in allowing | |
6689 | * a ring fd as it doesn't support regular read/write anyway. | |
6690 | */ | |
05f3fb3c JA |
6691 | if (file->f_op == &io_uring_fops) { |
6692 | fput(file); | |
6b06314c JA |
6693 | break; |
6694 | } | |
6b06314c | 6695 | ret = 0; |
05f3fb3c | 6696 | table->files[index] = file; |
6b06314c JA |
6697 | } |
6698 | ||
6699 | if (ret) { | |
65e19f54 | 6700 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
6701 | file = io_file_from_index(ctx, i); |
6702 | if (file) | |
6703 | fput(file); | |
6704 | } | |
6705 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 6706 | kfree(ctx->file_data->table[i].files); |
6b06314c | 6707 | |
05f3fb3c JA |
6708 | kfree(ctx->file_data->table); |
6709 | kfree(ctx->file_data); | |
6710 | ctx->file_data = NULL; | |
6b06314c JA |
6711 | ctx->nr_user_files = 0; |
6712 | return ret; | |
6713 | } | |
6714 | ||
6715 | ret = io_sqe_files_scm(ctx); | |
05589553 | 6716 | if (ret) { |
6b06314c | 6717 | io_sqe_files_unregister(ctx); |
05589553 XW |
6718 | return ret; |
6719 | } | |
6b06314c | 6720 | |
05589553 XW |
6721 | ref_node = alloc_fixed_file_ref_node(ctx); |
6722 | if (IS_ERR(ref_node)) { | |
6723 | io_sqe_files_unregister(ctx); | |
6724 | return PTR_ERR(ref_node); | |
6725 | } | |
6726 | ||
6727 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6728 | spin_lock(&ctx->file_data->lock); |
05589553 | 6729 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 6730 | spin_unlock(&ctx->file_data->lock); |
05589553 | 6731 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
6732 | return ret; |
6733 | } | |
6734 | ||
c3a31e60 JA |
6735 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
6736 | int index) | |
6737 | { | |
6738 | #if defined(CONFIG_UNIX) | |
6739 | struct sock *sock = ctx->ring_sock->sk; | |
6740 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
6741 | struct sk_buff *skb; | |
6742 | ||
6743 | /* | |
6744 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
6745 | * file set. If there's no room, fall back to allocating a new skb | |
6746 | * and filling it in. | |
6747 | */ | |
6748 | spin_lock_irq(&head->lock); | |
6749 | skb = skb_peek(head); | |
6750 | if (skb) { | |
6751 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
6752 | ||
6753 | if (fpl->count < SCM_MAX_FD) { | |
6754 | __skb_unlink(skb, head); | |
6755 | spin_unlock_irq(&head->lock); | |
6756 | fpl->fp[fpl->count] = get_file(file); | |
6757 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
6758 | fpl->count++; | |
6759 | spin_lock_irq(&head->lock); | |
6760 | __skb_queue_head(head, skb); | |
6761 | } else { | |
6762 | skb = NULL; | |
6763 | } | |
6764 | } | |
6765 | spin_unlock_irq(&head->lock); | |
6766 | ||
6767 | if (skb) { | |
6768 | fput(file); | |
6769 | return 0; | |
6770 | } | |
6771 | ||
6772 | return __io_sqe_files_scm(ctx, 1, index); | |
6773 | #else | |
6774 | return 0; | |
6775 | #endif | |
6776 | } | |
6777 | ||
a5318d3c | 6778 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 6779 | struct file *file) |
05f3fb3c | 6780 | { |
a5318d3c | 6781 | struct io_file_put *pfile; |
05589553 XW |
6782 | struct percpu_ref *refs = data->cur_refs; |
6783 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 6784 | |
05f3fb3c | 6785 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
6786 | if (!pfile) |
6787 | return -ENOMEM; | |
05f3fb3c | 6788 | |
05589553 | 6789 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 6790 | pfile->file = file; |
05589553 XW |
6791 | list_add(&pfile->list, &ref_node->file_list); |
6792 | ||
a5318d3c | 6793 | return 0; |
05f3fb3c JA |
6794 | } |
6795 | ||
6796 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
6797 | struct io_uring_files_update *up, | |
6798 | unsigned nr_args) | |
6799 | { | |
6800 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 6801 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6802 | struct file *file; |
c3a31e60 JA |
6803 | __s32 __user *fds; |
6804 | int fd, i, err; | |
6805 | __u32 done; | |
05589553 | 6806 | bool needs_switch = false; |
c3a31e60 | 6807 | |
05f3fb3c | 6808 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
6809 | return -EOVERFLOW; |
6810 | if (done > ctx->nr_user_files) | |
6811 | return -EINVAL; | |
6812 | ||
05589553 XW |
6813 | ref_node = alloc_fixed_file_ref_node(ctx); |
6814 | if (IS_ERR(ref_node)) | |
6815 | return PTR_ERR(ref_node); | |
6816 | ||
c3a31e60 | 6817 | done = 0; |
05f3fb3c | 6818 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 6819 | while (nr_args) { |
65e19f54 JA |
6820 | struct fixed_file_table *table; |
6821 | unsigned index; | |
6822 | ||
c3a31e60 JA |
6823 | err = 0; |
6824 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
6825 | err = -EFAULT; | |
6826 | break; | |
6827 | } | |
05f3fb3c JA |
6828 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
6829 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
6830 | index = i & IORING_FILE_TABLE_MASK; |
6831 | if (table->files[index]) { | |
05f3fb3c | 6832 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
6833 | err = io_queue_file_removal(data, file); |
6834 | if (err) | |
6835 | break; | |
65e19f54 | 6836 | table->files[index] = NULL; |
05589553 | 6837 | needs_switch = true; |
c3a31e60 JA |
6838 | } |
6839 | if (fd != -1) { | |
c3a31e60 JA |
6840 | file = fget(fd); |
6841 | if (!file) { | |
6842 | err = -EBADF; | |
6843 | break; | |
6844 | } | |
6845 | /* | |
6846 | * Don't allow io_uring instances to be registered. If | |
6847 | * UNIX isn't enabled, then this causes a reference | |
6848 | * cycle and this instance can never get freed. If UNIX | |
6849 | * is enabled we'll handle it just fine, but there's | |
6850 | * still no point in allowing a ring fd as it doesn't | |
6851 | * support regular read/write anyway. | |
6852 | */ | |
6853 | if (file->f_op == &io_uring_fops) { | |
6854 | fput(file); | |
6855 | err = -EBADF; | |
6856 | break; | |
6857 | } | |
65e19f54 | 6858 | table->files[index] = file; |
c3a31e60 JA |
6859 | err = io_sqe_file_register(ctx, file, i); |
6860 | if (err) | |
6861 | break; | |
6862 | } | |
6863 | nr_args--; | |
6864 | done++; | |
05f3fb3c JA |
6865 | up->offset++; |
6866 | } | |
6867 | ||
05589553 XW |
6868 | if (needs_switch) { |
6869 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 6870 | spin_lock(&data->lock); |
05589553 XW |
6871 | list_add(&ref_node->node, &data->ref_list); |
6872 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6873 | spin_unlock(&data->lock); |
05589553 XW |
6874 | percpu_ref_get(&ctx->file_data->refs); |
6875 | } else | |
6876 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
6877 | |
6878 | return done ? done : err; | |
6879 | } | |
05589553 | 6880 | |
05f3fb3c JA |
6881 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
6882 | unsigned nr_args) | |
6883 | { | |
6884 | struct io_uring_files_update up; | |
6885 | ||
6886 | if (!ctx->file_data) | |
6887 | return -ENXIO; | |
6888 | if (!nr_args) | |
6889 | return -EINVAL; | |
6890 | if (copy_from_user(&up, arg, sizeof(up))) | |
6891 | return -EFAULT; | |
6892 | if (up.resv) | |
6893 | return -EINVAL; | |
6894 | ||
6895 | return __io_sqe_files_update(ctx, &up, nr_args); | |
6896 | } | |
c3a31e60 | 6897 | |
e9fd9396 | 6898 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
6899 | { |
6900 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6901 | ||
e9fd9396 | 6902 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
6903 | io_put_req(req); |
6904 | } | |
6905 | ||
24369c2e PB |
6906 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
6907 | struct io_uring_params *p) | |
6908 | { | |
6909 | struct io_wq_data data; | |
6910 | struct fd f; | |
6911 | struct io_ring_ctx *ctx_attach; | |
6912 | unsigned int concurrency; | |
6913 | int ret = 0; | |
6914 | ||
6915 | data.user = ctx->user; | |
e9fd9396 | 6916 | data.free_work = io_free_work; |
24369c2e PB |
6917 | |
6918 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
6919 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
6920 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
6921 | ||
6922 | ctx->io_wq = io_wq_create(concurrency, &data); | |
6923 | if (IS_ERR(ctx->io_wq)) { | |
6924 | ret = PTR_ERR(ctx->io_wq); | |
6925 | ctx->io_wq = NULL; | |
6926 | } | |
6927 | return ret; | |
6928 | } | |
6929 | ||
6930 | f = fdget(p->wq_fd); | |
6931 | if (!f.file) | |
6932 | return -EBADF; | |
6933 | ||
6934 | if (f.file->f_op != &io_uring_fops) { | |
6935 | ret = -EINVAL; | |
6936 | goto out_fput; | |
6937 | } | |
6938 | ||
6939 | ctx_attach = f.file->private_data; | |
6940 | /* @io_wq is protected by holding the fd */ | |
6941 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
6942 | ret = -EINVAL; | |
6943 | goto out_fput; | |
6944 | } | |
6945 | ||
6946 | ctx->io_wq = ctx_attach->io_wq; | |
6947 | out_fput: | |
6948 | fdput(f); | |
6949 | return ret; | |
6950 | } | |
6951 | ||
6c271ce2 JA |
6952 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
6953 | struct io_uring_params *p) | |
2b188cc1 JA |
6954 | { |
6955 | int ret; | |
6956 | ||
6c271ce2 | 6957 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 JA |
6958 | mmgrab(current->mm); |
6959 | ctx->sqo_mm = current->mm; | |
6960 | ||
6c271ce2 | 6961 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
6962 | ret = -EPERM; |
6963 | if (!capable(CAP_SYS_ADMIN)) | |
6964 | goto err; | |
6965 | ||
917257da JA |
6966 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
6967 | if (!ctx->sq_thread_idle) | |
6968 | ctx->sq_thread_idle = HZ; | |
6969 | ||
6c271ce2 | 6970 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 6971 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 6972 | |
917257da | 6973 | ret = -EINVAL; |
44a9bd18 JA |
6974 | if (cpu >= nr_cpu_ids) |
6975 | goto err; | |
7889f44d | 6976 | if (!cpu_online(cpu)) |
917257da JA |
6977 | goto err; |
6978 | ||
6c271ce2 JA |
6979 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
6980 | ctx, cpu, | |
6981 | "io_uring-sq"); | |
6982 | } else { | |
6983 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
6984 | "io_uring-sq"); | |
6985 | } | |
6986 | if (IS_ERR(ctx->sqo_thread)) { | |
6987 | ret = PTR_ERR(ctx->sqo_thread); | |
6988 | ctx->sqo_thread = NULL; | |
6989 | goto err; | |
6990 | } | |
6991 | wake_up_process(ctx->sqo_thread); | |
6992 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
6993 | /* Can't have SQ_AFF without SQPOLL */ | |
6994 | ret = -EINVAL; | |
6995 | goto err; | |
6996 | } | |
6997 | ||
24369c2e PB |
6998 | ret = io_init_wq_offload(ctx, p); |
6999 | if (ret) | |
2b188cc1 | 7000 | goto err; |
2b188cc1 JA |
7001 | |
7002 | return 0; | |
7003 | err: | |
54a91f3b | 7004 | io_finish_async(ctx); |
2b188cc1 JA |
7005 | mmdrop(ctx->sqo_mm); |
7006 | ctx->sqo_mm = NULL; | |
7007 | return ret; | |
7008 | } | |
7009 | ||
7010 | static void io_unaccount_mem(struct user_struct *user, unsigned long nr_pages) | |
7011 | { | |
7012 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7013 | } | |
7014 | ||
7015 | static int io_account_mem(struct user_struct *user, unsigned long nr_pages) | |
7016 | { | |
7017 | unsigned long page_limit, cur_pages, new_pages; | |
7018 | ||
7019 | /* Don't allow more pages than we can safely lock */ | |
7020 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7021 | ||
7022 | do { | |
7023 | cur_pages = atomic_long_read(&user->locked_vm); | |
7024 | new_pages = cur_pages + nr_pages; | |
7025 | if (new_pages > page_limit) | |
7026 | return -ENOMEM; | |
7027 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7028 | new_pages) != cur_pages); | |
7029 | ||
7030 | return 0; | |
7031 | } | |
7032 | ||
7033 | static void io_mem_free(void *ptr) | |
7034 | { | |
52e04ef4 MR |
7035 | struct page *page; |
7036 | ||
7037 | if (!ptr) | |
7038 | return; | |
2b188cc1 | 7039 | |
52e04ef4 | 7040 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7041 | if (put_page_testzero(page)) |
7042 | free_compound_page(page); | |
7043 | } | |
7044 | ||
7045 | static void *io_mem_alloc(size_t size) | |
7046 | { | |
7047 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7048 | __GFP_NORETRY; | |
7049 | ||
7050 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7051 | } | |
7052 | ||
75b28aff HV |
7053 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7054 | size_t *sq_offset) | |
7055 | { | |
7056 | struct io_rings *rings; | |
7057 | size_t off, sq_array_size; | |
7058 | ||
7059 | off = struct_size(rings, cqes, cq_entries); | |
7060 | if (off == SIZE_MAX) | |
7061 | return SIZE_MAX; | |
7062 | ||
7063 | #ifdef CONFIG_SMP | |
7064 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7065 | if (off == 0) | |
7066 | return SIZE_MAX; | |
7067 | #endif | |
7068 | ||
7069 | sq_array_size = array_size(sizeof(u32), sq_entries); | |
7070 | if (sq_array_size == SIZE_MAX) | |
7071 | return SIZE_MAX; | |
7072 | ||
7073 | if (check_add_overflow(off, sq_array_size, &off)) | |
7074 | return SIZE_MAX; | |
7075 | ||
7076 | if (sq_offset) | |
7077 | *sq_offset = off; | |
7078 | ||
7079 | return off; | |
7080 | } | |
7081 | ||
2b188cc1 JA |
7082 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7083 | { | |
75b28aff | 7084 | size_t pages; |
2b188cc1 | 7085 | |
75b28aff HV |
7086 | pages = (size_t)1 << get_order( |
7087 | rings_size(sq_entries, cq_entries, NULL)); | |
7088 | pages += (size_t)1 << get_order( | |
7089 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7090 | |
75b28aff | 7091 | return pages; |
2b188cc1 JA |
7092 | } |
7093 | ||
edafccee JA |
7094 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7095 | { | |
7096 | int i, j; | |
7097 | ||
7098 | if (!ctx->user_bufs) | |
7099 | return -ENXIO; | |
7100 | ||
7101 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7102 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7103 | ||
7104 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7105 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee JA |
7106 | |
7107 | if (ctx->account_mem) | |
7108 | io_unaccount_mem(ctx->user, imu->nr_bvecs); | |
d4ef6475 | 7109 | kvfree(imu->bvec); |
edafccee JA |
7110 | imu->nr_bvecs = 0; |
7111 | } | |
7112 | ||
7113 | kfree(ctx->user_bufs); | |
7114 | ctx->user_bufs = NULL; | |
7115 | ctx->nr_user_bufs = 0; | |
7116 | return 0; | |
7117 | } | |
7118 | ||
7119 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7120 | void __user *arg, unsigned index) | |
7121 | { | |
7122 | struct iovec __user *src; | |
7123 | ||
7124 | #ifdef CONFIG_COMPAT | |
7125 | if (ctx->compat) { | |
7126 | struct compat_iovec __user *ciovs; | |
7127 | struct compat_iovec ciov; | |
7128 | ||
7129 | ciovs = (struct compat_iovec __user *) arg; | |
7130 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7131 | return -EFAULT; | |
7132 | ||
d55e5f5b | 7133 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7134 | dst->iov_len = ciov.iov_len; |
7135 | return 0; | |
7136 | } | |
7137 | #endif | |
7138 | src = (struct iovec __user *) arg; | |
7139 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7140 | return -EFAULT; | |
7141 | return 0; | |
7142 | } | |
7143 | ||
7144 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7145 | unsigned nr_args) | |
7146 | { | |
7147 | struct vm_area_struct **vmas = NULL; | |
7148 | struct page **pages = NULL; | |
7149 | int i, j, got_pages = 0; | |
7150 | int ret = -EINVAL; | |
7151 | ||
7152 | if (ctx->user_bufs) | |
7153 | return -EBUSY; | |
7154 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7155 | return -EINVAL; | |
7156 | ||
7157 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7158 | GFP_KERNEL); | |
7159 | if (!ctx->user_bufs) | |
7160 | return -ENOMEM; | |
7161 | ||
7162 | for (i = 0; i < nr_args; i++) { | |
7163 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7164 | unsigned long off, start, end, ubuf; | |
7165 | int pret, nr_pages; | |
7166 | struct iovec iov; | |
7167 | size_t size; | |
7168 | ||
7169 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7170 | if (ret) | |
a278682d | 7171 | goto err; |
edafccee JA |
7172 | |
7173 | /* | |
7174 | * Don't impose further limits on the size and buffer | |
7175 | * constraints here, we'll -EINVAL later when IO is | |
7176 | * submitted if they are wrong. | |
7177 | */ | |
7178 | ret = -EFAULT; | |
7179 | if (!iov.iov_base || !iov.iov_len) | |
7180 | goto err; | |
7181 | ||
7182 | /* arbitrary limit, but we need something */ | |
7183 | if (iov.iov_len > SZ_1G) | |
7184 | goto err; | |
7185 | ||
7186 | ubuf = (unsigned long) iov.iov_base; | |
7187 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7188 | start = ubuf >> PAGE_SHIFT; | |
7189 | nr_pages = end - start; | |
7190 | ||
7191 | if (ctx->account_mem) { | |
7192 | ret = io_account_mem(ctx->user, nr_pages); | |
7193 | if (ret) | |
7194 | goto err; | |
7195 | } | |
7196 | ||
7197 | ret = 0; | |
7198 | if (!pages || nr_pages > got_pages) { | |
7199 | kfree(vmas); | |
7200 | kfree(pages); | |
d4ef6475 | 7201 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7202 | GFP_KERNEL); |
d4ef6475 | 7203 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7204 | sizeof(struct vm_area_struct *), |
7205 | GFP_KERNEL); | |
7206 | if (!pages || !vmas) { | |
7207 | ret = -ENOMEM; | |
7208 | if (ctx->account_mem) | |
7209 | io_unaccount_mem(ctx->user, nr_pages); | |
7210 | goto err; | |
7211 | } | |
7212 | got_pages = nr_pages; | |
7213 | } | |
7214 | ||
d4ef6475 | 7215 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7216 | GFP_KERNEL); |
7217 | ret = -ENOMEM; | |
7218 | if (!imu->bvec) { | |
7219 | if (ctx->account_mem) | |
7220 | io_unaccount_mem(ctx->user, nr_pages); | |
7221 | goto err; | |
7222 | } | |
7223 | ||
7224 | ret = 0; | |
7225 | down_read(¤t->mm->mmap_sem); | |
2113b05d | 7226 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7227 | FOLL_WRITE | FOLL_LONGTERM, |
7228 | pages, vmas); | |
edafccee JA |
7229 | if (pret == nr_pages) { |
7230 | /* don't support file backed memory */ | |
7231 | for (j = 0; j < nr_pages; j++) { | |
7232 | struct vm_area_struct *vma = vmas[j]; | |
7233 | ||
7234 | if (vma->vm_file && | |
7235 | !is_file_hugepages(vma->vm_file)) { | |
7236 | ret = -EOPNOTSUPP; | |
7237 | break; | |
7238 | } | |
7239 | } | |
7240 | } else { | |
7241 | ret = pret < 0 ? pret : -EFAULT; | |
7242 | } | |
7243 | up_read(¤t->mm->mmap_sem); | |
7244 | if (ret) { | |
7245 | /* | |
7246 | * if we did partial map, or found file backed vmas, | |
7247 | * release any pages we did get | |
7248 | */ | |
27c4d3a3 | 7249 | if (pret > 0) |
f1f6a7dd | 7250 | unpin_user_pages(pages, pret); |
edafccee JA |
7251 | if (ctx->account_mem) |
7252 | io_unaccount_mem(ctx->user, nr_pages); | |
d4ef6475 | 7253 | kvfree(imu->bvec); |
edafccee JA |
7254 | goto err; |
7255 | } | |
7256 | ||
7257 | off = ubuf & ~PAGE_MASK; | |
7258 | size = iov.iov_len; | |
7259 | for (j = 0; j < nr_pages; j++) { | |
7260 | size_t vec_len; | |
7261 | ||
7262 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7263 | imu->bvec[j].bv_page = pages[j]; | |
7264 | imu->bvec[j].bv_len = vec_len; | |
7265 | imu->bvec[j].bv_offset = off; | |
7266 | off = 0; | |
7267 | size -= vec_len; | |
7268 | } | |
7269 | /* store original address for later verification */ | |
7270 | imu->ubuf = ubuf; | |
7271 | imu->len = iov.iov_len; | |
7272 | imu->nr_bvecs = nr_pages; | |
7273 | ||
7274 | ctx->nr_user_bufs++; | |
7275 | } | |
d4ef6475 MR |
7276 | kvfree(pages); |
7277 | kvfree(vmas); | |
edafccee JA |
7278 | return 0; |
7279 | err: | |
d4ef6475 MR |
7280 | kvfree(pages); |
7281 | kvfree(vmas); | |
edafccee JA |
7282 | io_sqe_buffer_unregister(ctx); |
7283 | return ret; | |
7284 | } | |
7285 | ||
9b402849 JA |
7286 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7287 | { | |
7288 | __s32 __user *fds = arg; | |
7289 | int fd; | |
7290 | ||
7291 | if (ctx->cq_ev_fd) | |
7292 | return -EBUSY; | |
7293 | ||
7294 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7295 | return -EFAULT; | |
7296 | ||
7297 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7298 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7299 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7300 | ctx->cq_ev_fd = NULL; | |
7301 | return ret; | |
7302 | } | |
7303 | ||
7304 | return 0; | |
7305 | } | |
7306 | ||
7307 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7308 | { | |
7309 | if (ctx->cq_ev_fd) { | |
7310 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7311 | ctx->cq_ev_fd = NULL; | |
7312 | return 0; | |
7313 | } | |
7314 | ||
7315 | return -ENXIO; | |
7316 | } | |
7317 | ||
5a2e745d JA |
7318 | static int __io_destroy_buffers(int id, void *p, void *data) |
7319 | { | |
7320 | struct io_ring_ctx *ctx = data; | |
7321 | struct io_buffer *buf = p; | |
7322 | ||
067524e9 | 7323 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7324 | return 0; |
7325 | } | |
7326 | ||
7327 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7328 | { | |
7329 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7330 | idr_destroy(&ctx->io_buffer_idr); | |
7331 | } | |
7332 | ||
2b188cc1 JA |
7333 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7334 | { | |
6b06314c | 7335 | io_finish_async(ctx); |
2b188cc1 JA |
7336 | if (ctx->sqo_mm) |
7337 | mmdrop(ctx->sqo_mm); | |
def596e9 JA |
7338 | |
7339 | io_iopoll_reap_events(ctx); | |
edafccee | 7340 | io_sqe_buffer_unregister(ctx); |
6b06314c | 7341 | io_sqe_files_unregister(ctx); |
9b402849 | 7342 | io_eventfd_unregister(ctx); |
5a2e745d | 7343 | io_destroy_buffers(ctx); |
41726c9a | 7344 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7345 | |
2b188cc1 | 7346 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7347 | if (ctx->ring_sock) { |
7348 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7349 | sock_release(ctx->ring_sock); |
355e8d26 | 7350 | } |
2b188cc1 JA |
7351 | #endif |
7352 | ||
75b28aff | 7353 | io_mem_free(ctx->rings); |
2b188cc1 | 7354 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7355 | |
7356 | percpu_ref_exit(&ctx->refs); | |
7357 | if (ctx->account_mem) | |
7358 | io_unaccount_mem(ctx->user, | |
7359 | ring_pages(ctx->sq_entries, ctx->cq_entries)); | |
7360 | free_uid(ctx->user); | |
181e448d | 7361 | put_cred(ctx->creds); |
78076bb6 | 7362 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7363 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7364 | kfree(ctx); |
7365 | } | |
7366 | ||
7367 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7368 | { | |
7369 | struct io_ring_ctx *ctx = file->private_data; | |
7370 | __poll_t mask = 0; | |
7371 | ||
7372 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7373 | /* |
7374 | * synchronizes with barrier from wq_has_sleeper call in | |
7375 | * io_commit_cqring | |
7376 | */ | |
2b188cc1 | 7377 | smp_rmb(); |
75b28aff HV |
7378 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7379 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7380 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7381 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7382 | mask |= EPOLLIN | EPOLLRDNORM; |
7383 | ||
7384 | return mask; | |
7385 | } | |
7386 | ||
7387 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7388 | { | |
7389 | struct io_ring_ctx *ctx = file->private_data; | |
7390 | ||
7391 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7392 | } | |
7393 | ||
071698e1 JA |
7394 | static int io_remove_personalities(int id, void *p, void *data) |
7395 | { | |
7396 | struct io_ring_ctx *ctx = data; | |
7397 | const struct cred *cred; | |
7398 | ||
7399 | cred = idr_remove(&ctx->personality_idr, id); | |
7400 | if (cred) | |
7401 | put_cred(cred); | |
7402 | return 0; | |
7403 | } | |
7404 | ||
85faa7b8 JA |
7405 | static void io_ring_exit_work(struct work_struct *work) |
7406 | { | |
7407 | struct io_ring_ctx *ctx; | |
7408 | ||
7409 | ctx = container_of(work, struct io_ring_ctx, exit_work); | |
7410 | if (ctx->rings) | |
7411 | io_cqring_overflow_flush(ctx, true); | |
7412 | ||
0f158b4c | 7413 | wait_for_completion(&ctx->ref_comp); |
85faa7b8 JA |
7414 | io_ring_ctx_free(ctx); |
7415 | } | |
7416 | ||
2b188cc1 JA |
7417 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7418 | { | |
7419 | mutex_lock(&ctx->uring_lock); | |
7420 | percpu_ref_kill(&ctx->refs); | |
7421 | mutex_unlock(&ctx->uring_lock); | |
7422 | ||
5262f567 | 7423 | io_kill_timeouts(ctx); |
221c5eb2 | 7424 | io_poll_remove_all(ctx); |
561fb04a JA |
7425 | |
7426 | if (ctx->io_wq) | |
7427 | io_wq_cancel_all(ctx->io_wq); | |
7428 | ||
def596e9 | 7429 | io_iopoll_reap_events(ctx); |
15dff286 JA |
7430 | /* if we failed setting up the ctx, we might not have any rings */ |
7431 | if (ctx->rings) | |
7432 | io_cqring_overflow_flush(ctx, true); | |
071698e1 | 7433 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
85faa7b8 JA |
7434 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7435 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7436 | } |
7437 | ||
7438 | static int io_uring_release(struct inode *inode, struct file *file) | |
7439 | { | |
7440 | struct io_ring_ctx *ctx = file->private_data; | |
7441 | ||
7442 | file->private_data = NULL; | |
7443 | io_ring_ctx_wait_and_kill(ctx); | |
7444 | return 0; | |
7445 | } | |
7446 | ||
fcb323cc JA |
7447 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7448 | struct files_struct *files) | |
7449 | { | |
fcb323cc | 7450 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7451 | struct io_kiocb *cancel_req = NULL, *req; |
7452 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7453 | |
7454 | spin_lock_irq(&ctx->inflight_lock); | |
7455 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7456 | if (req->work.files != files) |
7457 | continue; | |
7458 | /* req is being completed, ignore */ | |
7459 | if (!refcount_inc_not_zero(&req->refs)) | |
7460 | continue; | |
7461 | cancel_req = req; | |
7462 | break; | |
fcb323cc | 7463 | } |
768134d4 | 7464 | if (cancel_req) |
fcb323cc | 7465 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7466 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7467 | spin_unlock_irq(&ctx->inflight_lock); |
7468 | ||
768134d4 JA |
7469 | /* We need to keep going until we don't find a matching req */ |
7470 | if (!cancel_req) | |
fcb323cc | 7471 | break; |
2f6d9b9d | 7472 | |
2ca10259 JA |
7473 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7474 | spin_lock_irq(&ctx->completion_lock); | |
7475 | list_del(&cancel_req->list); | |
7476 | cancel_req->flags &= ~REQ_F_OVERFLOW; | |
7477 | if (list_empty(&ctx->cq_overflow_list)) { | |
7478 | clear_bit(0, &ctx->sq_check_overflow); | |
7479 | clear_bit(0, &ctx->cq_check_overflow); | |
7480 | } | |
7481 | spin_unlock_irq(&ctx->completion_lock); | |
7482 | ||
7483 | WRITE_ONCE(ctx->rings->cq_overflow, | |
7484 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
7485 | ||
7486 | /* | |
7487 | * Put inflight ref and overflow ref. If that's | |
7488 | * all we had, then we're done with this request. | |
7489 | */ | |
7490 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7491 | io_free_req(cancel_req); |
d8f1b971 | 7492 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7493 | continue; |
7494 | } | |
7495 | } | |
7496 | ||
2f6d9b9d BL |
7497 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); |
7498 | io_put_req(cancel_req); | |
fcb323cc | 7499 | schedule(); |
d8f1b971 | 7500 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7501 | } |
7502 | } | |
7503 | ||
7504 | static int io_uring_flush(struct file *file, void *data) | |
7505 | { | |
7506 | struct io_ring_ctx *ctx = file->private_data; | |
7507 | ||
7508 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7509 | |
7510 | /* | |
7511 | * If the task is going away, cancel work it may have pending | |
7512 | */ | |
7513 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) | |
7514 | io_wq_cancel_pid(ctx->io_wq, task_pid_vnr(current)); | |
7515 | ||
fcb323cc JA |
7516 | return 0; |
7517 | } | |
7518 | ||
6c5c240e RP |
7519 | static void *io_uring_validate_mmap_request(struct file *file, |
7520 | loff_t pgoff, size_t sz) | |
2b188cc1 | 7521 | { |
2b188cc1 | 7522 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 7523 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
7524 | struct page *page; |
7525 | void *ptr; | |
7526 | ||
7527 | switch (offset) { | |
7528 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
7529 | case IORING_OFF_CQ_RING: |
7530 | ptr = ctx->rings; | |
2b188cc1 JA |
7531 | break; |
7532 | case IORING_OFF_SQES: | |
7533 | ptr = ctx->sq_sqes; | |
7534 | break; | |
2b188cc1 | 7535 | default: |
6c5c240e | 7536 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
7537 | } |
7538 | ||
7539 | page = virt_to_head_page(ptr); | |
a50b854e | 7540 | if (sz > page_size(page)) |
6c5c240e RP |
7541 | return ERR_PTR(-EINVAL); |
7542 | ||
7543 | return ptr; | |
7544 | } | |
7545 | ||
7546 | #ifdef CONFIG_MMU | |
7547 | ||
7548 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7549 | { | |
7550 | size_t sz = vma->vm_end - vma->vm_start; | |
7551 | unsigned long pfn; | |
7552 | void *ptr; | |
7553 | ||
7554 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
7555 | if (IS_ERR(ptr)) | |
7556 | return PTR_ERR(ptr); | |
2b188cc1 JA |
7557 | |
7558 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
7559 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
7560 | } | |
7561 | ||
6c5c240e RP |
7562 | #else /* !CONFIG_MMU */ |
7563 | ||
7564 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7565 | { | |
7566 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
7567 | } | |
7568 | ||
7569 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
7570 | { | |
7571 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
7572 | } | |
7573 | ||
7574 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
7575 | unsigned long addr, unsigned long len, | |
7576 | unsigned long pgoff, unsigned long flags) | |
7577 | { | |
7578 | void *ptr; | |
7579 | ||
7580 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
7581 | if (IS_ERR(ptr)) | |
7582 | return PTR_ERR(ptr); | |
7583 | ||
7584 | return (unsigned long) ptr; | |
7585 | } | |
7586 | ||
7587 | #endif /* !CONFIG_MMU */ | |
7588 | ||
2b188cc1 JA |
7589 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
7590 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
7591 | size_t, sigsz) | |
7592 | { | |
7593 | struct io_ring_ctx *ctx; | |
7594 | long ret = -EBADF; | |
7595 | int submitted = 0; | |
7596 | struct fd f; | |
7597 | ||
b41e9852 JA |
7598 | if (current->task_works) |
7599 | task_work_run(); | |
7600 | ||
6c271ce2 | 7601 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
7602 | return -EINVAL; |
7603 | ||
7604 | f = fdget(fd); | |
7605 | if (!f.file) | |
7606 | return -EBADF; | |
7607 | ||
7608 | ret = -EOPNOTSUPP; | |
7609 | if (f.file->f_op != &io_uring_fops) | |
7610 | goto out_fput; | |
7611 | ||
7612 | ret = -ENXIO; | |
7613 | ctx = f.file->private_data; | |
7614 | if (!percpu_ref_tryget(&ctx->refs)) | |
7615 | goto out_fput; | |
7616 | ||
6c271ce2 JA |
7617 | /* |
7618 | * For SQ polling, the thread will do all submissions and completions. | |
7619 | * Just return the requested submit count, and wake the thread if | |
7620 | * we were asked to. | |
7621 | */ | |
b2a9eada | 7622 | ret = 0; |
6c271ce2 | 7623 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
7624 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
7625 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
7626 | if (flags & IORING_ENTER_SQ_WAKEUP) |
7627 | wake_up(&ctx->sqo_wait); | |
7628 | submitted = to_submit; | |
b2a9eada | 7629 | } else if (to_submit) { |
2b188cc1 | 7630 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 7631 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 7632 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
7633 | |
7634 | if (submitted != to_submit) | |
7635 | goto out; | |
2b188cc1 JA |
7636 | } |
7637 | if (flags & IORING_ENTER_GETEVENTS) { | |
def596e9 JA |
7638 | unsigned nr_events = 0; |
7639 | ||
2b188cc1 JA |
7640 | min_complete = min(min_complete, ctx->cq_entries); |
7641 | ||
32b2244a XW |
7642 | /* |
7643 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
7644 | * space applications don't need to do io completion events | |
7645 | * polling again, they can rely on io_sq_thread to do polling | |
7646 | * work, which can reduce cpu usage and uring_lock contention. | |
7647 | */ | |
7648 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
7649 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
def596e9 | 7650 | ret = io_iopoll_check(ctx, &nr_events, min_complete); |
def596e9 JA |
7651 | } else { |
7652 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
7653 | } | |
2b188cc1 JA |
7654 | } |
7655 | ||
7c504e65 | 7656 | out: |
6805b32e | 7657 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
7658 | out_fput: |
7659 | fdput(f); | |
7660 | return submitted ? submitted : ret; | |
7661 | } | |
7662 | ||
bebdb65e | 7663 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
7664 | static int io_uring_show_cred(int id, void *p, void *data) |
7665 | { | |
7666 | const struct cred *cred = p; | |
7667 | struct seq_file *m = data; | |
7668 | struct user_namespace *uns = seq_user_ns(m); | |
7669 | struct group_info *gi; | |
7670 | kernel_cap_t cap; | |
7671 | unsigned __capi; | |
7672 | int g; | |
7673 | ||
7674 | seq_printf(m, "%5d\n", id); | |
7675 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
7676 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
7677 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
7678 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
7679 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
7680 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
7681 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
7682 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
7683 | seq_puts(m, "\n\tGroups:\t"); | |
7684 | gi = cred->group_info; | |
7685 | for (g = 0; g < gi->ngroups; g++) { | |
7686 | seq_put_decimal_ull(m, g ? " " : "", | |
7687 | from_kgid_munged(uns, gi->gid[g])); | |
7688 | } | |
7689 | seq_puts(m, "\n\tCapEff:\t"); | |
7690 | cap = cred->cap_effective; | |
7691 | CAP_FOR_EACH_U32(__capi) | |
7692 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
7693 | seq_putc(m, '\n'); | |
7694 | return 0; | |
7695 | } | |
7696 | ||
7697 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
7698 | { | |
7699 | int i; | |
7700 | ||
7701 | mutex_lock(&ctx->uring_lock); | |
7702 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
7703 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7704 | struct fixed_file_table *table; | |
7705 | struct file *f; | |
7706 | ||
7707 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7708 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
7709 | if (f) | |
7710 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
7711 | else | |
7712 | seq_printf(m, "%5u: <none>\n", i); | |
7713 | } | |
7714 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
7715 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7716 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
7717 | ||
7718 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
7719 | (unsigned int) buf->len); | |
7720 | } | |
7721 | if (!idr_is_empty(&ctx->personality_idr)) { | |
7722 | seq_printf(m, "Personalities:\n"); | |
7723 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
7724 | } | |
d7718a9d JA |
7725 | seq_printf(m, "PollList:\n"); |
7726 | spin_lock_irq(&ctx->completion_lock); | |
7727 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
7728 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
7729 | struct io_kiocb *req; | |
7730 | ||
7731 | hlist_for_each_entry(req, list, hash_node) | |
7732 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7733 | req->task->task_works != NULL); | |
7734 | } | |
7735 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
7736 | mutex_unlock(&ctx->uring_lock); |
7737 | } | |
7738 | ||
7739 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
7740 | { | |
7741 | struct io_ring_ctx *ctx = f->private_data; | |
7742 | ||
7743 | if (percpu_ref_tryget(&ctx->refs)) { | |
7744 | __io_uring_show_fdinfo(ctx, m); | |
7745 | percpu_ref_put(&ctx->refs); | |
7746 | } | |
7747 | } | |
bebdb65e | 7748 | #endif |
87ce955b | 7749 | |
2b188cc1 JA |
7750 | static const struct file_operations io_uring_fops = { |
7751 | .release = io_uring_release, | |
fcb323cc | 7752 | .flush = io_uring_flush, |
2b188cc1 | 7753 | .mmap = io_uring_mmap, |
6c5c240e RP |
7754 | #ifndef CONFIG_MMU |
7755 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
7756 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
7757 | #endif | |
2b188cc1 JA |
7758 | .poll = io_uring_poll, |
7759 | .fasync = io_uring_fasync, | |
bebdb65e | 7760 | #ifdef CONFIG_PROC_FS |
87ce955b | 7761 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 7762 | #endif |
2b188cc1 JA |
7763 | }; |
7764 | ||
7765 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
7766 | struct io_uring_params *p) | |
7767 | { | |
75b28aff HV |
7768 | struct io_rings *rings; |
7769 | size_t size, sq_array_offset; | |
2b188cc1 | 7770 | |
75b28aff HV |
7771 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
7772 | if (size == SIZE_MAX) | |
7773 | return -EOVERFLOW; | |
7774 | ||
7775 | rings = io_mem_alloc(size); | |
7776 | if (!rings) | |
2b188cc1 JA |
7777 | return -ENOMEM; |
7778 | ||
75b28aff HV |
7779 | ctx->rings = rings; |
7780 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
7781 | rings->sq_ring_mask = p->sq_entries - 1; | |
7782 | rings->cq_ring_mask = p->cq_entries - 1; | |
7783 | rings->sq_ring_entries = p->sq_entries; | |
7784 | rings->cq_ring_entries = p->cq_entries; | |
7785 | ctx->sq_mask = rings->sq_ring_mask; | |
7786 | ctx->cq_mask = rings->cq_ring_mask; | |
7787 | ctx->sq_entries = rings->sq_ring_entries; | |
7788 | ctx->cq_entries = rings->cq_ring_entries; | |
2b188cc1 JA |
7789 | |
7790 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
7791 | if (size == SIZE_MAX) { |
7792 | io_mem_free(ctx->rings); | |
7793 | ctx->rings = NULL; | |
2b188cc1 | 7794 | return -EOVERFLOW; |
eb065d30 | 7795 | } |
2b188cc1 JA |
7796 | |
7797 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
7798 | if (!ctx->sq_sqes) { |
7799 | io_mem_free(ctx->rings); | |
7800 | ctx->rings = NULL; | |
2b188cc1 | 7801 | return -ENOMEM; |
eb065d30 | 7802 | } |
2b188cc1 | 7803 | |
2b188cc1 JA |
7804 | return 0; |
7805 | } | |
7806 | ||
7807 | /* | |
7808 | * Allocate an anonymous fd, this is what constitutes the application | |
7809 | * visible backing of an io_uring instance. The application mmaps this | |
7810 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
7811 | * we have to tie this fd to a socket for file garbage collection purposes. | |
7812 | */ | |
7813 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
7814 | { | |
7815 | struct file *file; | |
7816 | int ret; | |
7817 | ||
7818 | #if defined(CONFIG_UNIX) | |
7819 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
7820 | &ctx->ring_sock); | |
7821 | if (ret) | |
7822 | return ret; | |
7823 | #endif | |
7824 | ||
7825 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
7826 | if (ret < 0) | |
7827 | goto err; | |
7828 | ||
7829 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
7830 | O_RDWR | O_CLOEXEC); | |
7831 | if (IS_ERR(file)) { | |
7832 | put_unused_fd(ret); | |
7833 | ret = PTR_ERR(file); | |
7834 | goto err; | |
7835 | } | |
7836 | ||
7837 | #if defined(CONFIG_UNIX) | |
7838 | ctx->ring_sock->file = file; | |
7839 | #endif | |
7840 | fd_install(ret, file); | |
7841 | return ret; | |
7842 | err: | |
7843 | #if defined(CONFIG_UNIX) | |
7844 | sock_release(ctx->ring_sock); | |
7845 | ctx->ring_sock = NULL; | |
7846 | #endif | |
7847 | return ret; | |
7848 | } | |
7849 | ||
7f13657d XW |
7850 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
7851 | struct io_uring_params __user *params) | |
2b188cc1 JA |
7852 | { |
7853 | struct user_struct *user = NULL; | |
7854 | struct io_ring_ctx *ctx; | |
7855 | bool account_mem; | |
7856 | int ret; | |
7857 | ||
8110c1a6 | 7858 | if (!entries) |
2b188cc1 | 7859 | return -EINVAL; |
8110c1a6 JA |
7860 | if (entries > IORING_MAX_ENTRIES) { |
7861 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7862 | return -EINVAL; | |
7863 | entries = IORING_MAX_ENTRIES; | |
7864 | } | |
2b188cc1 JA |
7865 | |
7866 | /* | |
7867 | * Use twice as many entries for the CQ ring. It's possible for the | |
7868 | * application to drive a higher depth than the size of the SQ ring, | |
7869 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
7870 | * some flexibility in overcommitting a bit. If the application has |
7871 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
7872 | * of CQ ring entries manually. | |
2b188cc1 JA |
7873 | */ |
7874 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
7875 | if (p->flags & IORING_SETUP_CQSIZE) { |
7876 | /* | |
7877 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
7878 | * to a power-of-two, if it isn't already. We do NOT impose | |
7879 | * any cq vs sq ring sizing. | |
7880 | */ | |
8110c1a6 | 7881 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 7882 | return -EINVAL; |
8110c1a6 JA |
7883 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
7884 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7885 | return -EINVAL; | |
7886 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
7887 | } | |
33a107f0 JA |
7888 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
7889 | } else { | |
7890 | p->cq_entries = 2 * p->sq_entries; | |
7891 | } | |
2b188cc1 JA |
7892 | |
7893 | user = get_uid(current_user()); | |
7894 | account_mem = !capable(CAP_IPC_LOCK); | |
7895 | ||
7896 | if (account_mem) { | |
7897 | ret = io_account_mem(user, | |
7898 | ring_pages(p->sq_entries, p->cq_entries)); | |
7899 | if (ret) { | |
7900 | free_uid(user); | |
7901 | return ret; | |
7902 | } | |
7903 | } | |
7904 | ||
7905 | ctx = io_ring_ctx_alloc(p); | |
7906 | if (!ctx) { | |
7907 | if (account_mem) | |
7908 | io_unaccount_mem(user, ring_pages(p->sq_entries, | |
7909 | p->cq_entries)); | |
7910 | free_uid(user); | |
7911 | return -ENOMEM; | |
7912 | } | |
7913 | ctx->compat = in_compat_syscall(); | |
7914 | ctx->account_mem = account_mem; | |
7915 | ctx->user = user; | |
0b8c0ec7 | 7916 | ctx->creds = get_current_cred(); |
2b188cc1 JA |
7917 | |
7918 | ret = io_allocate_scq_urings(ctx, p); | |
7919 | if (ret) | |
7920 | goto err; | |
7921 | ||
6c271ce2 | 7922 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
7923 | if (ret) |
7924 | goto err; | |
7925 | ||
2b188cc1 | 7926 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
7927 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
7928 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
7929 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
7930 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
7931 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
7932 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
7933 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
7934 | |
7935 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
7936 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
7937 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
7938 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
7939 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
7940 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
7941 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 7942 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 7943 | |
7f13657d XW |
7944 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
7945 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
7946 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL; | |
7947 | ||
7948 | if (copy_to_user(params, p, sizeof(*p))) { | |
7949 | ret = -EFAULT; | |
7950 | goto err; | |
7951 | } | |
044c1ab3 JA |
7952 | /* |
7953 | * Install ring fd as the very last thing, so we don't risk someone | |
7954 | * having closed it before we finish setup | |
7955 | */ | |
7956 | ret = io_uring_get_fd(ctx); | |
7957 | if (ret < 0) | |
7958 | goto err; | |
7959 | ||
c826bd7a | 7960 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
7961 | return ret; |
7962 | err: | |
7963 | io_ring_ctx_wait_and_kill(ctx); | |
7964 | return ret; | |
7965 | } | |
7966 | ||
7967 | /* | |
7968 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
7969 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
7970 | * params structure passed in. | |
7971 | */ | |
7972 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
7973 | { | |
7974 | struct io_uring_params p; | |
2b188cc1 JA |
7975 | int i; |
7976 | ||
7977 | if (copy_from_user(&p, params, sizeof(p))) | |
7978 | return -EFAULT; | |
7979 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
7980 | if (p.resv[i]) | |
7981 | return -EINVAL; | |
7982 | } | |
7983 | ||
6c271ce2 | 7984 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 7985 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 7986 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
7987 | return -EINVAL; |
7988 | ||
7f13657d | 7989 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
7990 | } |
7991 | ||
7992 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
7993 | struct io_uring_params __user *, params) | |
7994 | { | |
7995 | return io_uring_setup(entries, params); | |
7996 | } | |
7997 | ||
66f4af93 JA |
7998 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
7999 | { | |
8000 | struct io_uring_probe *p; | |
8001 | size_t size; | |
8002 | int i, ret; | |
8003 | ||
8004 | size = struct_size(p, ops, nr_args); | |
8005 | if (size == SIZE_MAX) | |
8006 | return -EOVERFLOW; | |
8007 | p = kzalloc(size, GFP_KERNEL); | |
8008 | if (!p) | |
8009 | return -ENOMEM; | |
8010 | ||
8011 | ret = -EFAULT; | |
8012 | if (copy_from_user(p, arg, size)) | |
8013 | goto out; | |
8014 | ret = -EINVAL; | |
8015 | if (memchr_inv(p, 0, size)) | |
8016 | goto out; | |
8017 | ||
8018 | p->last_op = IORING_OP_LAST - 1; | |
8019 | if (nr_args > IORING_OP_LAST) | |
8020 | nr_args = IORING_OP_LAST; | |
8021 | ||
8022 | for (i = 0; i < nr_args; i++) { | |
8023 | p->ops[i].op = i; | |
8024 | if (!io_op_defs[i].not_supported) | |
8025 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8026 | } | |
8027 | p->ops_len = i; | |
8028 | ||
8029 | ret = 0; | |
8030 | if (copy_to_user(arg, p, size)) | |
8031 | ret = -EFAULT; | |
8032 | out: | |
8033 | kfree(p); | |
8034 | return ret; | |
8035 | } | |
8036 | ||
071698e1 JA |
8037 | static int io_register_personality(struct io_ring_ctx *ctx) |
8038 | { | |
8039 | const struct cred *creds = get_current_cred(); | |
8040 | int id; | |
8041 | ||
8042 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8043 | USHRT_MAX, GFP_KERNEL); | |
8044 | if (id < 0) | |
8045 | put_cred(creds); | |
8046 | return id; | |
8047 | } | |
8048 | ||
8049 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8050 | { | |
8051 | const struct cred *old_creds; | |
8052 | ||
8053 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8054 | if (old_creds) { | |
8055 | put_cred(old_creds); | |
8056 | return 0; | |
8057 | } | |
8058 | ||
8059 | return -EINVAL; | |
8060 | } | |
8061 | ||
8062 | static bool io_register_op_must_quiesce(int op) | |
8063 | { | |
8064 | switch (op) { | |
8065 | case IORING_UNREGISTER_FILES: | |
8066 | case IORING_REGISTER_FILES_UPDATE: | |
8067 | case IORING_REGISTER_PROBE: | |
8068 | case IORING_REGISTER_PERSONALITY: | |
8069 | case IORING_UNREGISTER_PERSONALITY: | |
8070 | return false; | |
8071 | default: | |
8072 | return true; | |
8073 | } | |
8074 | } | |
8075 | ||
edafccee JA |
8076 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8077 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8078 | __releases(ctx->uring_lock) |
8079 | __acquires(ctx->uring_lock) | |
edafccee JA |
8080 | { |
8081 | int ret; | |
8082 | ||
35fa71a0 JA |
8083 | /* |
8084 | * We're inside the ring mutex, if the ref is already dying, then | |
8085 | * someone else killed the ctx or is already going through | |
8086 | * io_uring_register(). | |
8087 | */ | |
8088 | if (percpu_ref_is_dying(&ctx->refs)) | |
8089 | return -ENXIO; | |
8090 | ||
071698e1 | 8091 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8092 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8093 | |
05f3fb3c JA |
8094 | /* |
8095 | * Drop uring mutex before waiting for references to exit. If | |
8096 | * another thread is currently inside io_uring_enter() it might | |
8097 | * need to grab the uring_lock to make progress. If we hold it | |
8098 | * here across the drain wait, then we can deadlock. It's safe | |
8099 | * to drop the mutex here, since no new references will come in | |
8100 | * after we've killed the percpu ref. | |
8101 | */ | |
8102 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8103 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8104 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8105 | if (ret) { |
8106 | percpu_ref_resurrect(&ctx->refs); | |
8107 | ret = -EINTR; | |
8108 | goto out; | |
8109 | } | |
05f3fb3c | 8110 | } |
edafccee JA |
8111 | |
8112 | switch (opcode) { | |
8113 | case IORING_REGISTER_BUFFERS: | |
8114 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8115 | break; | |
8116 | case IORING_UNREGISTER_BUFFERS: | |
8117 | ret = -EINVAL; | |
8118 | if (arg || nr_args) | |
8119 | break; | |
8120 | ret = io_sqe_buffer_unregister(ctx); | |
8121 | break; | |
6b06314c JA |
8122 | case IORING_REGISTER_FILES: |
8123 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8124 | break; | |
8125 | case IORING_UNREGISTER_FILES: | |
8126 | ret = -EINVAL; | |
8127 | if (arg || nr_args) | |
8128 | break; | |
8129 | ret = io_sqe_files_unregister(ctx); | |
8130 | break; | |
c3a31e60 JA |
8131 | case IORING_REGISTER_FILES_UPDATE: |
8132 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8133 | break; | |
9b402849 | 8134 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8135 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8136 | ret = -EINVAL; |
8137 | if (nr_args != 1) | |
8138 | break; | |
8139 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8140 | if (ret) |
8141 | break; | |
8142 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8143 | ctx->eventfd_async = 1; | |
8144 | else | |
8145 | ctx->eventfd_async = 0; | |
9b402849 JA |
8146 | break; |
8147 | case IORING_UNREGISTER_EVENTFD: | |
8148 | ret = -EINVAL; | |
8149 | if (arg || nr_args) | |
8150 | break; | |
8151 | ret = io_eventfd_unregister(ctx); | |
8152 | break; | |
66f4af93 JA |
8153 | case IORING_REGISTER_PROBE: |
8154 | ret = -EINVAL; | |
8155 | if (!arg || nr_args > 256) | |
8156 | break; | |
8157 | ret = io_probe(ctx, arg, nr_args); | |
8158 | break; | |
071698e1 JA |
8159 | case IORING_REGISTER_PERSONALITY: |
8160 | ret = -EINVAL; | |
8161 | if (arg || nr_args) | |
8162 | break; | |
8163 | ret = io_register_personality(ctx); | |
8164 | break; | |
8165 | case IORING_UNREGISTER_PERSONALITY: | |
8166 | ret = -EINVAL; | |
8167 | if (arg) | |
8168 | break; | |
8169 | ret = io_unregister_personality(ctx, nr_args); | |
8170 | break; | |
edafccee JA |
8171 | default: |
8172 | ret = -EINVAL; | |
8173 | break; | |
8174 | } | |
8175 | ||
071698e1 | 8176 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8177 | /* bring the ctx back to life */ |
05f3fb3c | 8178 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8179 | out: |
0f158b4c | 8180 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8181 | } |
edafccee JA |
8182 | return ret; |
8183 | } | |
8184 | ||
8185 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8186 | void __user *, arg, unsigned int, nr_args) | |
8187 | { | |
8188 | struct io_ring_ctx *ctx; | |
8189 | long ret = -EBADF; | |
8190 | struct fd f; | |
8191 | ||
8192 | f = fdget(fd); | |
8193 | if (!f.file) | |
8194 | return -EBADF; | |
8195 | ||
8196 | ret = -EOPNOTSUPP; | |
8197 | if (f.file->f_op != &io_uring_fops) | |
8198 | goto out_fput; | |
8199 | ||
8200 | ctx = f.file->private_data; | |
8201 | ||
8202 | mutex_lock(&ctx->uring_lock); | |
8203 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8204 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8205 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8206 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8207 | out_fput: |
8208 | fdput(f); | |
8209 | return ret; | |
8210 | } | |
8211 | ||
2b188cc1 JA |
8212 | static int __init io_uring_init(void) |
8213 | { | |
d7f62e82 SM |
8214 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8215 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8216 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8217 | } while (0) | |
8218 | ||
8219 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8220 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8221 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8222 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8223 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8224 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8225 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8226 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8227 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8228 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8229 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8230 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8231 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8232 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8233 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8234 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
8235 | BUILD_BUG_SQE_ELEM(28, __u16, poll_events); | |
8236 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); | |
8237 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8238 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8239 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8240 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8241 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8242 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8243 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8244 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8245 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8246 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8247 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8248 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8249 | |
d3656344 | 8250 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8251 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8252 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8253 | return 0; | |
8254 | }; | |
8255 | __initcall(io_uring_init); |