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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 | |
d068b506 | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
1e84b97b SB |
15 | * store head will do). Failure to do so could lead to reading invalid |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
2b188cc1 | 60 | #include <linux/blkdev.h> |
edafccee | 61 | #include <linux/bvec.h> |
2b188cc1 JA |
62 | #include <linux/net.h> |
63 | #include <net/sock.h> | |
64 | #include <net/af_unix.h> | |
6b06314c | 65 | #include <net/scm.h> |
2b188cc1 JA |
66 | #include <linux/anon_inodes.h> |
67 | #include <linux/sched/mm.h> | |
68 | #include <linux/uaccess.h> | |
69 | #include <linux/nospec.h> | |
edafccee JA |
70 | #include <linux/sizes.h> |
71 | #include <linux/hugetlb.h> | |
aa4c3967 | 72 | #include <linux/highmem.h> |
15b71abe JA |
73 | #include <linux/namei.h> |
74 | #include <linux/fsnotify.h> | |
4840e418 | 75 | #include <linux/fadvise.h> |
3e4827b0 | 76 | #include <linux/eventpoll.h> |
7d67af2c | 77 | #include <linux/splice.h> |
b41e9852 | 78 | #include <linux/task_work.h> |
bcf5a063 | 79 | #include <linux/pagemap.h> |
0f212204 | 80 | #include <linux/io_uring.h> |
ef98eb04 | 81 | #include <linux/tracehook.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) |
4ce8ad95 | 93 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 94 | |
187f08c1 | 95 | /* only define max */ |
042b0d85 | 96 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
97 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
98 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 99 | |
187f08c1 | 100 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
101 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
102 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
103 | ||
489809e2 PB |
104 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
105 | ||
68fe256a PB |
106 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
107 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) | |
108 | ||
109 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS|IOSQE_BUFFER_SELECT|IOSQE_IO_DRAIN) | |
110 | ||
c854357b | 111 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
d886e185 PB |
112 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \ |
113 | REQ_F_ASYNC_DATA) | |
b16fed66 | 114 | |
09899b19 PB |
115 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
116 | ||
2b188cc1 JA |
117 | struct io_uring { |
118 | u32 head ____cacheline_aligned_in_smp; | |
119 | u32 tail ____cacheline_aligned_in_smp; | |
120 | }; | |
121 | ||
1e84b97b | 122 | /* |
75b28aff HV |
123 | * This data is shared with the application through the mmap at offsets |
124 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
125 | * |
126 | * The offsets to the member fields are published through struct | |
127 | * io_sqring_offsets when calling io_uring_setup. | |
128 | */ | |
75b28aff | 129 | struct io_rings { |
1e84b97b SB |
130 | /* |
131 | * Head and tail offsets into the ring; the offsets need to be | |
132 | * masked to get valid indices. | |
133 | * | |
75b28aff HV |
134 | * The kernel controls head of the sq ring and the tail of the cq ring, |
135 | * and the application controls tail of the sq ring and the head of the | |
136 | * cq ring. | |
1e84b97b | 137 | */ |
75b28aff | 138 | struct io_uring sq, cq; |
1e84b97b | 139 | /* |
75b28aff | 140 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
141 | * ring_entries - 1) |
142 | */ | |
75b28aff HV |
143 | u32 sq_ring_mask, cq_ring_mask; |
144 | /* Ring sizes (constant, power of 2) */ | |
145 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
146 | /* |
147 | * Number of invalid entries dropped by the kernel due to | |
148 | * invalid index stored in array | |
149 | * | |
150 | * Written by the kernel, shouldn't be modified by the | |
151 | * application (i.e. get number of "new events" by comparing to | |
152 | * cached value). | |
153 | * | |
154 | * After a new SQ head value was read by the application this | |
155 | * counter includes all submissions that were dropped reaching | |
156 | * the new SQ head (and possibly more). | |
157 | */ | |
75b28aff | 158 | u32 sq_dropped; |
1e84b97b | 159 | /* |
0d9b5b3a | 160 | * Runtime SQ flags |
1e84b97b SB |
161 | * |
162 | * Written by the kernel, shouldn't be modified by the | |
163 | * application. | |
164 | * | |
165 | * The application needs a full memory barrier before checking | |
166 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
167 | */ | |
75b28aff | 168 | u32 sq_flags; |
0d9b5b3a SG |
169 | /* |
170 | * Runtime CQ flags | |
171 | * | |
172 | * Written by the application, shouldn't be modified by the | |
173 | * kernel. | |
174 | */ | |
fe7e3257 | 175 | u32 cq_flags; |
1e84b97b SB |
176 | /* |
177 | * Number of completion events lost because the queue was full; | |
178 | * this should be avoided by the application by making sure | |
0b4295b5 | 179 | * there are not more requests pending than there is space in |
1e84b97b SB |
180 | * the completion queue. |
181 | * | |
182 | * Written by the kernel, shouldn't be modified by the | |
183 | * application (i.e. get number of "new events" by comparing to | |
184 | * cached value). | |
185 | * | |
186 | * As completion events come in out of order this counter is not | |
187 | * ordered with any other data. | |
188 | */ | |
75b28aff | 189 | u32 cq_overflow; |
1e84b97b SB |
190 | /* |
191 | * Ring buffer of completion events. | |
192 | * | |
193 | * The kernel writes completion events fresh every time they are | |
194 | * produced, so the application is allowed to modify pending | |
195 | * entries. | |
196 | */ | |
75b28aff | 197 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
198 | }; |
199 | ||
45d189c6 PB |
200 | enum io_uring_cmd_flags { |
201 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 202 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
203 | }; |
204 | ||
edafccee JA |
205 | struct io_mapped_ubuf { |
206 | u64 ubuf; | |
4751f53d | 207 | u64 ubuf_end; |
edafccee | 208 | unsigned int nr_bvecs; |
de293938 | 209 | unsigned long acct_pages; |
41edf1a5 | 210 | struct bio_vec bvec[]; |
edafccee JA |
211 | }; |
212 | ||
50238531 BM |
213 | struct io_ring_ctx; |
214 | ||
6c2450ae PB |
215 | struct io_overflow_cqe { |
216 | struct io_uring_cqe cqe; | |
217 | struct list_head list; | |
218 | }; | |
219 | ||
a04b0ac0 PB |
220 | struct io_fixed_file { |
221 | /* file * with additional FFS_* flags */ | |
222 | unsigned long file_ptr; | |
223 | }; | |
224 | ||
269bbe5f BM |
225 | struct io_rsrc_put { |
226 | struct list_head list; | |
b60c8dce | 227 | u64 tag; |
50238531 BM |
228 | union { |
229 | void *rsrc; | |
230 | struct file *file; | |
bd54b6fe | 231 | struct io_mapped_ubuf *buf; |
50238531 | 232 | }; |
269bbe5f BM |
233 | }; |
234 | ||
aeca241b | 235 | struct io_file_table { |
042b0d85 | 236 | struct io_fixed_file *files; |
31b51510 JA |
237 | }; |
238 | ||
b895c9a6 | 239 | struct io_rsrc_node { |
05589553 XW |
240 | struct percpu_ref refs; |
241 | struct list_head node; | |
269bbe5f | 242 | struct list_head rsrc_list; |
b895c9a6 | 243 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 244 | struct llist_node llist; |
e297822b | 245 | bool done; |
05589553 XW |
246 | }; |
247 | ||
40ae0ff7 PB |
248 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
249 | ||
b895c9a6 | 250 | struct io_rsrc_data { |
05f3fb3c JA |
251 | struct io_ring_ctx *ctx; |
252 | ||
2d091d62 PB |
253 | u64 **tags; |
254 | unsigned int nr; | |
40ae0ff7 | 255 | rsrc_put_fn *do_put; |
3e942498 | 256 | atomic_t refs; |
05f3fb3c | 257 | struct completion done; |
8bad28d8 | 258 | bool quiesce; |
05f3fb3c JA |
259 | }; |
260 | ||
5a2e745d JA |
261 | struct io_buffer { |
262 | struct list_head list; | |
263 | __u64 addr; | |
d1f82808 | 264 | __u32 len; |
5a2e745d JA |
265 | __u16 bid; |
266 | }; | |
267 | ||
21b55dbc SG |
268 | struct io_restriction { |
269 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
270 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
271 | u8 sqe_flags_allowed; | |
272 | u8 sqe_flags_required; | |
7e84e1c7 | 273 | bool registered; |
21b55dbc SG |
274 | }; |
275 | ||
37d1e2e3 JA |
276 | enum { |
277 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
278 | IO_SQ_THREAD_SHOULD_PARK, | |
279 | }; | |
280 | ||
534ca6d6 JA |
281 | struct io_sq_data { |
282 | refcount_t refs; | |
9e138a48 | 283 | atomic_t park_pending; |
09a6f4ef | 284 | struct mutex lock; |
69fb2131 JA |
285 | |
286 | /* ctx's that are using this sqd */ | |
287 | struct list_head ctx_list; | |
69fb2131 | 288 | |
534ca6d6 JA |
289 | struct task_struct *thread; |
290 | struct wait_queue_head wait; | |
08369246 XW |
291 | |
292 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
293 | int sq_cpu; |
294 | pid_t task_pid; | |
5c2469e0 | 295 | pid_t task_tgid; |
37d1e2e3 JA |
296 | |
297 | unsigned long state; | |
37d1e2e3 | 298 | struct completion exited; |
534ca6d6 JA |
299 | }; |
300 | ||
6dd0be1e | 301 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 302 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 303 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 304 | |
a1ab7b35 PB |
305 | struct io_submit_link { |
306 | struct io_kiocb *head; | |
307 | struct io_kiocb *last; | |
308 | }; | |
309 | ||
258b29a9 | 310 | struct io_submit_state { |
5a158c6b PB |
311 | /* inline/task_work completion list, under ->uring_lock */ |
312 | struct io_wq_work_node free_list; | |
313 | /* batch completion logic */ | |
314 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 315 | struct io_submit_link link; |
258b29a9 | 316 | |
258b29a9 | 317 | bool plug_started; |
4b628aeb | 318 | bool need_plug; |
5a158c6b | 319 | struct blk_plug plug; |
258b29a9 PB |
320 | }; |
321 | ||
2b188cc1 | 322 | struct io_ring_ctx { |
b52ecf8c | 323 | /* const or read-mostly hot data */ |
2b188cc1 JA |
324 | struct { |
325 | struct percpu_ref refs; | |
2b188cc1 | 326 | |
b52ecf8c | 327 | struct io_rings *rings; |
2b188cc1 | 328 | unsigned int flags; |
e1d85334 | 329 | unsigned int compat: 1; |
e1d85334 RD |
330 | unsigned int drain_next: 1; |
331 | unsigned int eventfd_async: 1; | |
21b55dbc | 332 | unsigned int restricted: 1; |
f18ee4cf | 333 | unsigned int off_timeout_used: 1; |
10c66904 | 334 | unsigned int drain_active: 1; |
b52ecf8c | 335 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 336 | |
7f1129d2 | 337 | /* submission data */ |
b52ecf8c | 338 | struct { |
0499e582 PB |
339 | struct mutex uring_lock; |
340 | ||
75b28aff HV |
341 | /* |
342 | * Ring buffer of indices into array of io_uring_sqe, which is | |
343 | * mmapped by the application using the IORING_OFF_SQES offset. | |
344 | * | |
345 | * This indirection could e.g. be used to assign fixed | |
346 | * io_uring_sqe entries to operations and only submit them to | |
347 | * the queue when needed. | |
348 | * | |
349 | * The kernel modifies neither the indices array nor the entries | |
350 | * array. | |
351 | */ | |
352 | u32 *sq_array; | |
c7af47cf | 353 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
354 | unsigned cached_sq_head; |
355 | unsigned sq_entries; | |
de0617e4 | 356 | struct list_head defer_list; |
7f1129d2 PB |
357 | |
358 | /* | |
359 | * Fixed resources fast path, should be accessed only under | |
360 | * uring_lock, and updated through io_uring_register(2) | |
361 | */ | |
362 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 363 | int rsrc_cached_refs; |
7f1129d2 PB |
364 | struct io_file_table file_table; |
365 | unsigned nr_user_files; | |
366 | unsigned nr_user_bufs; | |
367 | struct io_mapped_ubuf **user_bufs; | |
368 | ||
369 | struct io_submit_state submit_state; | |
5262f567 | 370 | struct list_head timeout_list; |
ef9dd637 | 371 | struct list_head ltimeout_list; |
1d7bb1d5 | 372 | struct list_head cq_overflow_list; |
7f1129d2 PB |
373 | struct xarray io_buffers; |
374 | struct xarray personalities; | |
375 | u32 pers_next; | |
376 | unsigned sq_thread_idle; | |
2b188cc1 JA |
377 | } ____cacheline_aligned_in_smp; |
378 | ||
d0acdee2 | 379 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 380 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 381 | unsigned int locked_free_nr; |
3c1a2ead | 382 | |
7c30f36a | 383 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
384 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
385 | ||
90554200 | 386 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 387 | struct list_head sqd_list; |
75b28aff | 388 | |
5ed7a37d PB |
389 | unsigned long check_cq_overflow; |
390 | ||
206aefde JA |
391 | struct { |
392 | unsigned cached_cq_tail; | |
393 | unsigned cq_entries; | |
0499e582 | 394 | struct eventfd_ctx *cq_ev_fd; |
0499e582 PB |
395 | struct wait_queue_head cq_wait; |
396 | unsigned cq_extra; | |
397 | atomic_t cq_timeouts; | |
0499e582 | 398 | unsigned cq_last_tm_flush; |
206aefde | 399 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 400 | |
2b188cc1 JA |
401 | struct { |
402 | spinlock_t completion_lock; | |
e94f141b | 403 | |
89850fce JA |
404 | spinlock_t timeout_lock; |
405 | ||
def596e9 | 406 | /* |
540e32a0 | 407 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
408 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
409 | * For SQPOLL, only the single threaded io_sq_thread() will | |
410 | * manipulate the list, hence no extra locking is needed there. | |
411 | */ | |
5eef4e87 | 412 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
413 | struct hlist_head *cancel_hash; |
414 | unsigned cancel_hash_bits; | |
915b3dde | 415 | bool poll_multi_queue; |
2b188cc1 | 416 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 417 | |
21b55dbc | 418 | struct io_restriction restrictions; |
3c1a2ead | 419 | |
b13a8918 PB |
420 | /* slow path rsrc auxilary data, used by update/register */ |
421 | struct { | |
422 | struct io_rsrc_node *rsrc_backup_node; | |
423 | struct io_mapped_ubuf *dummy_ubuf; | |
424 | struct io_rsrc_data *file_data; | |
425 | struct io_rsrc_data *buf_data; | |
426 | ||
427 | struct delayed_work rsrc_put_work; | |
428 | struct llist_head rsrc_put_llist; | |
429 | struct list_head rsrc_ref_list; | |
430 | spinlock_t rsrc_ref_lock; | |
431 | }; | |
432 | ||
3c1a2ead | 433 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
434 | struct { |
435 | #if defined(CONFIG_UNIX) | |
436 | struct socket *ring_sock; | |
437 | #endif | |
438 | /* hashed buffered write serialization */ | |
439 | struct io_wq_hash *hash_map; | |
440 | ||
441 | /* Only used for accounting purposes */ | |
442 | struct user_struct *user; | |
443 | struct mm_struct *mm_account; | |
444 | ||
445 | /* ctx exit and cancelation */ | |
9011bf9a PB |
446 | struct llist_head fallback_llist; |
447 | struct delayed_work fallback_work; | |
b986af7e PB |
448 | struct work_struct exit_work; |
449 | struct list_head tctx_list; | |
450 | struct completion ref_comp; | |
451 | }; | |
2b188cc1 JA |
452 | }; |
453 | ||
53e043b2 SM |
454 | struct io_uring_task { |
455 | /* submission side */ | |
09899b19 | 456 | int cached_refs; |
53e043b2 SM |
457 | struct xarray xa; |
458 | struct wait_queue_head wait; | |
ee53fb2b SM |
459 | const struct io_ring_ctx *last; |
460 | struct io_wq *io_wq; | |
53e043b2 | 461 | struct percpu_counter inflight; |
b303fe2e | 462 | atomic_t inflight_tracked; |
53e043b2 | 463 | atomic_t in_idle; |
53e043b2 SM |
464 | |
465 | spinlock_t task_lock; | |
466 | struct io_wq_work_list task_list; | |
53e043b2 | 467 | struct callback_head task_work; |
6294f368 | 468 | bool task_running; |
53e043b2 SM |
469 | }; |
470 | ||
09bb8394 JA |
471 | /* |
472 | * First field must be the file pointer in all the | |
473 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
474 | */ | |
221c5eb2 JA |
475 | struct io_poll_iocb { |
476 | struct file *file; | |
018043be | 477 | struct wait_queue_head *head; |
221c5eb2 | 478 | __poll_t events; |
8c838788 | 479 | bool done; |
221c5eb2 | 480 | bool canceled; |
392edb45 | 481 | struct wait_queue_entry wait; |
221c5eb2 JA |
482 | }; |
483 | ||
9d805892 | 484 | struct io_poll_update { |
018043be | 485 | struct file *file; |
9d805892 PB |
486 | u64 old_user_data; |
487 | u64 new_user_data; | |
488 | __poll_t events; | |
b69de288 JA |
489 | bool update_events; |
490 | bool update_user_data; | |
018043be PB |
491 | }; |
492 | ||
b5dba59e JA |
493 | struct io_close { |
494 | struct file *file; | |
b5dba59e | 495 | int fd; |
7df778be | 496 | u32 file_slot; |
b5dba59e JA |
497 | }; |
498 | ||
ad8a48ac JA |
499 | struct io_timeout_data { |
500 | struct io_kiocb *req; | |
501 | struct hrtimer timer; | |
502 | struct timespec64 ts; | |
503 | enum hrtimer_mode mode; | |
50c1df2b | 504 | u32 flags; |
ad8a48ac JA |
505 | }; |
506 | ||
8ed8d3c3 JA |
507 | struct io_accept { |
508 | struct file *file; | |
509 | struct sockaddr __user *addr; | |
510 | int __user *addr_len; | |
511 | int flags; | |
aaa4db12 | 512 | u32 file_slot; |
09952e3e | 513 | unsigned long nofile; |
8ed8d3c3 JA |
514 | }; |
515 | ||
516 | struct io_sync { | |
517 | struct file *file; | |
518 | loff_t len; | |
519 | loff_t off; | |
520 | int flags; | |
d63d1b5e | 521 | int mode; |
8ed8d3c3 JA |
522 | }; |
523 | ||
fbf23849 JA |
524 | struct io_cancel { |
525 | struct file *file; | |
526 | u64 addr; | |
527 | }; | |
528 | ||
b29472ee JA |
529 | struct io_timeout { |
530 | struct file *file; | |
bfe68a22 PB |
531 | u32 off; |
532 | u32 target_seq; | |
135fcde8 | 533 | struct list_head list; |
90cd7e42 PB |
534 | /* head of the link, used by linked timeouts only */ |
535 | struct io_kiocb *head; | |
89b263f6 JA |
536 | /* for linked completions */ |
537 | struct io_kiocb *prev; | |
b29472ee JA |
538 | }; |
539 | ||
0bdf7a2d PB |
540 | struct io_timeout_rem { |
541 | struct file *file; | |
542 | u64 addr; | |
9c8e11b3 PB |
543 | |
544 | /* timeout update */ | |
545 | struct timespec64 ts; | |
546 | u32 flags; | |
f1042b6c | 547 | bool ltimeout; |
0bdf7a2d PB |
548 | }; |
549 | ||
9adbd45d JA |
550 | struct io_rw { |
551 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
552 | struct kiocb kiocb; | |
553 | u64 addr; | |
554 | u64 len; | |
555 | }; | |
556 | ||
3fbb51c1 JA |
557 | struct io_connect { |
558 | struct file *file; | |
559 | struct sockaddr __user *addr; | |
560 | int addr_len; | |
561 | }; | |
562 | ||
e47293fd JA |
563 | struct io_sr_msg { |
564 | struct file *file; | |
fddaface | 565 | union { |
4af3417a PB |
566 | struct compat_msghdr __user *umsg_compat; |
567 | struct user_msghdr __user *umsg; | |
568 | void __user *buf; | |
fddaface | 569 | }; |
e47293fd | 570 | int msg_flags; |
bcda7baa | 571 | int bgid; |
fddaface | 572 | size_t len; |
e47293fd JA |
573 | }; |
574 | ||
15b71abe JA |
575 | struct io_open { |
576 | struct file *file; | |
577 | int dfd; | |
b9445598 | 578 | u32 file_slot; |
15b71abe | 579 | struct filename *filename; |
c12cedf2 | 580 | struct open_how how; |
4022e7af | 581 | unsigned long nofile; |
15b71abe JA |
582 | }; |
583 | ||
269bbe5f | 584 | struct io_rsrc_update { |
05f3fb3c JA |
585 | struct file *file; |
586 | u64 arg; | |
587 | u32 nr_args; | |
588 | u32 offset; | |
589 | }; | |
590 | ||
4840e418 JA |
591 | struct io_fadvise { |
592 | struct file *file; | |
593 | u64 offset; | |
594 | u32 len; | |
595 | u32 advice; | |
596 | }; | |
597 | ||
c1ca757b JA |
598 | struct io_madvise { |
599 | struct file *file; | |
600 | u64 addr; | |
601 | u32 len; | |
602 | u32 advice; | |
603 | }; | |
604 | ||
3e4827b0 JA |
605 | struct io_epoll { |
606 | struct file *file; | |
607 | int epfd; | |
608 | int op; | |
609 | int fd; | |
610 | struct epoll_event event; | |
e47293fd JA |
611 | }; |
612 | ||
7d67af2c PB |
613 | struct io_splice { |
614 | struct file *file_out; | |
615 | struct file *file_in; | |
616 | loff_t off_out; | |
617 | loff_t off_in; | |
618 | u64 len; | |
619 | unsigned int flags; | |
620 | }; | |
621 | ||
ddf0322d JA |
622 | struct io_provide_buf { |
623 | struct file *file; | |
624 | __u64 addr; | |
38134ada | 625 | __u32 len; |
ddf0322d JA |
626 | __u32 bgid; |
627 | __u16 nbufs; | |
628 | __u16 bid; | |
629 | }; | |
630 | ||
1d9e1288 BM |
631 | struct io_statx { |
632 | struct file *file; | |
633 | int dfd; | |
634 | unsigned int mask; | |
635 | unsigned int flags; | |
e62753e4 | 636 | const char __user *filename; |
1d9e1288 BM |
637 | struct statx __user *buffer; |
638 | }; | |
639 | ||
36f4fa68 JA |
640 | struct io_shutdown { |
641 | struct file *file; | |
642 | int how; | |
643 | }; | |
644 | ||
80a261fd JA |
645 | struct io_rename { |
646 | struct file *file; | |
647 | int old_dfd; | |
648 | int new_dfd; | |
649 | struct filename *oldpath; | |
650 | struct filename *newpath; | |
651 | int flags; | |
652 | }; | |
653 | ||
14a1143b JA |
654 | struct io_unlink { |
655 | struct file *file; | |
656 | int dfd; | |
657 | int flags; | |
658 | struct filename *filename; | |
659 | }; | |
660 | ||
e34a02dc DK |
661 | struct io_mkdir { |
662 | struct file *file; | |
663 | int dfd; | |
664 | umode_t mode; | |
665 | struct filename *filename; | |
666 | }; | |
667 | ||
7a8721f8 DK |
668 | struct io_symlink { |
669 | struct file *file; | |
670 | int new_dfd; | |
671 | struct filename *oldpath; | |
672 | struct filename *newpath; | |
673 | }; | |
674 | ||
cf30da90 DK |
675 | struct io_hardlink { |
676 | struct file *file; | |
677 | int old_dfd; | |
678 | int new_dfd; | |
679 | struct filename *oldpath; | |
680 | struct filename *newpath; | |
681 | int flags; | |
682 | }; | |
683 | ||
f499a021 JA |
684 | struct io_async_connect { |
685 | struct sockaddr_storage address; | |
686 | }; | |
687 | ||
03b1230c JA |
688 | struct io_async_msghdr { |
689 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
690 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
691 | struct iovec *free_iov; | |
03b1230c JA |
692 | struct sockaddr __user *uaddr; |
693 | struct msghdr msg; | |
b537916c | 694 | struct sockaddr_storage addr; |
03b1230c JA |
695 | }; |
696 | ||
f67676d1 JA |
697 | struct io_async_rw { |
698 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
699 | const struct iovec *free_iovec; |
700 | struct iov_iter iter; | |
cd658695 | 701 | struct iov_iter_state iter_state; |
227c0c96 | 702 | size_t bytes_done; |
bcf5a063 | 703 | struct wait_page_queue wpq; |
f67676d1 JA |
704 | }; |
705 | ||
6b47ee6e PB |
706 | enum { |
707 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
708 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
709 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
710 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
711 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 712 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 713 | |
dddca226 | 714 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 715 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
716 | REQ_F_INFLIGHT_BIT, |
717 | REQ_F_CUR_POS_BIT, | |
718 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 719 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 720 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 721 | REQ_F_POLLED_BIT, |
bcda7baa | 722 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 723 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 724 | REQ_F_REISSUE_BIT, |
b8e64b53 | 725 | REQ_F_CREDS_BIT, |
20e60a38 | 726 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 727 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 728 | REQ_F_ASYNC_DATA_BIT, |
7b29f92d | 729 | /* keep async read/write and isreg together and in order */ |
b191e2df PB |
730 | REQ_F_NOWAIT_READ_BIT, |
731 | REQ_F_NOWAIT_WRITE_BIT, | |
7b29f92d | 732 | REQ_F_ISREG_BIT, |
84557871 JA |
733 | |
734 | /* not a real bit, just to check we're not overflowing the space */ | |
735 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
736 | }; |
737 | ||
738 | enum { | |
739 | /* ctx owns file */ | |
740 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
741 | /* drain existing IO first */ | |
742 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
743 | /* linked sqes */ | |
744 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
745 | /* doesn't sever on completion < 0 */ | |
746 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
747 | /* IOSQE_ASYNC */ | |
748 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
749 | /* IOSQE_BUFFER_SELECT */ |
750 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 751 | |
6b47ee6e | 752 | /* fail rest of links */ |
93d2bcd2 | 753 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 754 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
755 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
756 | /* read/write uses file position */ | |
757 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
758 | /* must not punt to workers */ | |
759 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 760 | /* has or had linked timeout */ |
6b47ee6e | 761 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
762 | /* needs cleanup */ |
763 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
764 | /* already went through poll handler */ |
765 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
766 | /* buffer already selected */ |
767 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
768 | /* completion is deferred through io_comp_state */ |
769 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
770 | /* caller should reissue async */ |
771 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
7b29f92d | 772 | /* supports async reads */ |
b191e2df | 773 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
7b29f92d | 774 | /* supports async writes */ |
b191e2df | 775 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
7b29f92d JA |
776 | /* regular file */ |
777 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
778 | /* has creds assigned */ |
779 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
780 | /* skip refcounting if not set */ |
781 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
782 | /* there is a linked timeout that has to be armed */ |
783 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
784 | /* ->async_data allocated */ |
785 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
d7718a9d JA |
786 | }; |
787 | ||
788 | struct async_poll { | |
789 | struct io_poll_iocb poll; | |
807abcb0 | 790 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
791 | }; |
792 | ||
f237c30a | 793 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 794 | |
7cbf1722 | 795 | struct io_task_work { |
5b0a6acc PB |
796 | union { |
797 | struct io_wq_work_node node; | |
798 | struct llist_node fallback_node; | |
799 | }; | |
800 | io_req_tw_func_t func; | |
7cbf1722 JA |
801 | }; |
802 | ||
992da01a PB |
803 | enum { |
804 | IORING_RSRC_FILE = 0, | |
805 | IORING_RSRC_BUFFER = 1, | |
806 | }; | |
807 | ||
09bb8394 JA |
808 | /* |
809 | * NOTE! Each of the iocb union members has the file pointer | |
810 | * as the first entry in their struct definition. So you can | |
811 | * access the file pointer through any of the sub-structs, | |
812 | * or directly as just 'ki_filp' in this struct. | |
813 | */ | |
2b188cc1 | 814 | struct io_kiocb { |
221c5eb2 | 815 | union { |
09bb8394 | 816 | struct file *file; |
9adbd45d | 817 | struct io_rw rw; |
221c5eb2 | 818 | struct io_poll_iocb poll; |
9d805892 | 819 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
820 | struct io_accept accept; |
821 | struct io_sync sync; | |
fbf23849 | 822 | struct io_cancel cancel; |
b29472ee | 823 | struct io_timeout timeout; |
0bdf7a2d | 824 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 825 | struct io_connect connect; |
e47293fd | 826 | struct io_sr_msg sr_msg; |
15b71abe | 827 | struct io_open open; |
b5dba59e | 828 | struct io_close close; |
269bbe5f | 829 | struct io_rsrc_update rsrc_update; |
4840e418 | 830 | struct io_fadvise fadvise; |
c1ca757b | 831 | struct io_madvise madvise; |
3e4827b0 | 832 | struct io_epoll epoll; |
7d67af2c | 833 | struct io_splice splice; |
ddf0322d | 834 | struct io_provide_buf pbuf; |
1d9e1288 | 835 | struct io_statx statx; |
36f4fa68 | 836 | struct io_shutdown shutdown; |
80a261fd | 837 | struct io_rename rename; |
14a1143b | 838 | struct io_unlink unlink; |
e34a02dc | 839 | struct io_mkdir mkdir; |
7a8721f8 | 840 | struct io_symlink symlink; |
cf30da90 | 841 | struct io_hardlink hardlink; |
221c5eb2 | 842 | }; |
2b188cc1 | 843 | |
d625c6ee | 844 | u8 opcode; |
65a6543d XW |
845 | /* polled IO has completed */ |
846 | u8 iopoll_completed; | |
4f4eeba8 | 847 | u16 buf_index; |
d17e56eb PB |
848 | unsigned int flags; |
849 | ||
850 | u64 user_data; | |
9cf7c104 | 851 | u32 result; |
d17e56eb | 852 | u32 cflags; |
4f4eeba8 | 853 | |
010e8e6b | 854 | struct io_ring_ctx *ctx; |
010e8e6b | 855 | struct task_struct *task; |
d7718a9d | 856 | |
269bbe5f | 857 | struct percpu_ref *fixed_rsrc_refs; |
d886e185 PB |
858 | /* store used ubuf, so we can prevent reloading */ |
859 | struct io_mapped_ubuf *imu; | |
fcb323cc | 860 | |
7e3709d5 | 861 | /* used by request caches, completion batching and iopoll */ |
ef05d9eb | 862 | struct io_wq_work_node comp_list; |
d17e56eb | 863 | atomic_t refs; |
7e3709d5 | 864 | struct io_kiocb *link; |
5b0a6acc | 865 | struct io_task_work io_task_work; |
010e8e6b PB |
866 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
867 | struct hlist_node hash_node; | |
7e3709d5 | 868 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 869 | struct async_poll *apoll; |
d886e185 PB |
870 | /* opcode allocated if it needs to store data for async defer */ |
871 | void *async_data; | |
ef05d9eb | 872 | struct io_wq_work work; |
7e3709d5 | 873 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
ef05d9eb | 874 | const struct cred *creds; |
7e3709d5 | 875 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ |
30d51dd4 | 876 | struct io_buffer *kbuf; |
2b188cc1 | 877 | }; |
05589553 | 878 | |
13bf43f5 PB |
879 | struct io_tctx_node { |
880 | struct list_head ctx_node; | |
881 | struct task_struct *task; | |
13bf43f5 PB |
882 | struct io_ring_ctx *ctx; |
883 | }; | |
884 | ||
27dc8338 PB |
885 | struct io_defer_entry { |
886 | struct list_head list; | |
887 | struct io_kiocb *req; | |
9cf7c104 | 888 | u32 seq; |
2b188cc1 JA |
889 | }; |
890 | ||
d3656344 | 891 | struct io_op_def { |
d3656344 JA |
892 | /* needs req->file assigned */ |
893 | unsigned needs_file : 1; | |
6d63416d PB |
894 | /* should block plug */ |
895 | unsigned plug : 1; | |
d3656344 JA |
896 | /* hash wq insertion if file is a regular file */ |
897 | unsigned hash_reg_file : 1; | |
898 | /* unbound wq insertion if file is a non-regular file */ | |
899 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
900 | /* set if opcode supports polled "wait" */ |
901 | unsigned pollin : 1; | |
902 | unsigned pollout : 1; | |
bcda7baa JA |
903 | /* op supports buffer selection */ |
904 | unsigned buffer_select : 1; | |
26f0505a PB |
905 | /* do prep async if is going to be punted */ |
906 | unsigned needs_async_setup : 1; | |
6d63416d PB |
907 | /* opcode is not supported by this kernel */ |
908 | unsigned not_supported : 1; | |
e8c2bc1f JA |
909 | /* size of async data needed, if any */ |
910 | unsigned short async_size; | |
d3656344 JA |
911 | }; |
912 | ||
0918682b | 913 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
914 | [IORING_OP_NOP] = {}, |
915 | [IORING_OP_READV] = { | |
d3656344 JA |
916 | .needs_file = 1, |
917 | .unbound_nonreg_file = 1, | |
8a72758c | 918 | .pollin = 1, |
4d954c25 | 919 | .buffer_select = 1, |
26f0505a | 920 | .needs_async_setup = 1, |
27926b68 | 921 | .plug = 1, |
e8c2bc1f | 922 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 923 | }, |
0463b6c5 | 924 | [IORING_OP_WRITEV] = { |
d3656344 JA |
925 | .needs_file = 1, |
926 | .hash_reg_file = 1, | |
927 | .unbound_nonreg_file = 1, | |
8a72758c | 928 | .pollout = 1, |
26f0505a | 929 | .needs_async_setup = 1, |
27926b68 | 930 | .plug = 1, |
e8c2bc1f | 931 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 932 | }, |
0463b6c5 | 933 | [IORING_OP_FSYNC] = { |
d3656344 JA |
934 | .needs_file = 1, |
935 | }, | |
0463b6c5 | 936 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
937 | .needs_file = 1, |
938 | .unbound_nonreg_file = 1, | |
8a72758c | 939 | .pollin = 1, |
27926b68 | 940 | .plug = 1, |
e8c2bc1f | 941 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 942 | }, |
0463b6c5 | 943 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
944 | .needs_file = 1, |
945 | .hash_reg_file = 1, | |
946 | .unbound_nonreg_file = 1, | |
8a72758c | 947 | .pollout = 1, |
27926b68 | 948 | .plug = 1, |
e8c2bc1f | 949 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 950 | }, |
0463b6c5 | 951 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
952 | .needs_file = 1, |
953 | .unbound_nonreg_file = 1, | |
954 | }, | |
0463b6c5 PB |
955 | [IORING_OP_POLL_REMOVE] = {}, |
956 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
957 | .needs_file = 1, |
958 | }, | |
0463b6c5 | 959 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
960 | .needs_file = 1, |
961 | .unbound_nonreg_file = 1, | |
8a72758c | 962 | .pollout = 1, |
26f0505a | 963 | .needs_async_setup = 1, |
e8c2bc1f | 964 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 965 | }, |
0463b6c5 | 966 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
967 | .needs_file = 1, |
968 | .unbound_nonreg_file = 1, | |
8a72758c | 969 | .pollin = 1, |
52de1fe1 | 970 | .buffer_select = 1, |
26f0505a | 971 | .needs_async_setup = 1, |
e8c2bc1f | 972 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 973 | }, |
0463b6c5 | 974 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 975 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 976 | }, |
9c8e11b3 PB |
977 | [IORING_OP_TIMEOUT_REMOVE] = { |
978 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 979 | }, |
0463b6c5 | 980 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
981 | .needs_file = 1, |
982 | .unbound_nonreg_file = 1, | |
8a72758c | 983 | .pollin = 1, |
d3656344 | 984 | }, |
0463b6c5 PB |
985 | [IORING_OP_ASYNC_CANCEL] = {}, |
986 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 987 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 988 | }, |
0463b6c5 | 989 | [IORING_OP_CONNECT] = { |
d3656344 JA |
990 | .needs_file = 1, |
991 | .unbound_nonreg_file = 1, | |
8a72758c | 992 | .pollout = 1, |
26f0505a | 993 | .needs_async_setup = 1, |
e8c2bc1f | 994 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 995 | }, |
0463b6c5 | 996 | [IORING_OP_FALLOCATE] = { |
d3656344 | 997 | .needs_file = 1, |
d3656344 | 998 | }, |
44526bed JA |
999 | [IORING_OP_OPENAT] = {}, |
1000 | [IORING_OP_CLOSE] = {}, | |
1001 | [IORING_OP_FILES_UPDATE] = {}, | |
1002 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 1003 | [IORING_OP_READ] = { |
3a6820f2 JA |
1004 | .needs_file = 1, |
1005 | .unbound_nonreg_file = 1, | |
8a72758c | 1006 | .pollin = 1, |
bcda7baa | 1007 | .buffer_select = 1, |
27926b68 | 1008 | .plug = 1, |
e8c2bc1f | 1009 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1010 | }, |
0463b6c5 | 1011 | [IORING_OP_WRITE] = { |
3a6820f2 | 1012 | .needs_file = 1, |
7b3188e7 | 1013 | .hash_reg_file = 1, |
3a6820f2 | 1014 | .unbound_nonreg_file = 1, |
8a72758c | 1015 | .pollout = 1, |
27926b68 | 1016 | .plug = 1, |
e8c2bc1f | 1017 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1018 | }, |
0463b6c5 | 1019 | [IORING_OP_FADVISE] = { |
4840e418 | 1020 | .needs_file = 1, |
c1ca757b | 1021 | }, |
44526bed | 1022 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1023 | [IORING_OP_SEND] = { |
fddaface JA |
1024 | .needs_file = 1, |
1025 | .unbound_nonreg_file = 1, | |
8a72758c | 1026 | .pollout = 1, |
fddaface | 1027 | }, |
0463b6c5 | 1028 | [IORING_OP_RECV] = { |
fddaface JA |
1029 | .needs_file = 1, |
1030 | .unbound_nonreg_file = 1, | |
8a72758c | 1031 | .pollin = 1, |
bcda7baa | 1032 | .buffer_select = 1, |
fddaface | 1033 | }, |
0463b6c5 | 1034 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1035 | }, |
3e4827b0 JA |
1036 | [IORING_OP_EPOLL_CTL] = { |
1037 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1038 | }, |
7d67af2c PB |
1039 | [IORING_OP_SPLICE] = { |
1040 | .needs_file = 1, | |
1041 | .hash_reg_file = 1, | |
1042 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1043 | }, |
1044 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1045 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1046 | [IORING_OP_TEE] = { |
1047 | .needs_file = 1, | |
1048 | .hash_reg_file = 1, | |
1049 | .unbound_nonreg_file = 1, | |
1050 | }, | |
36f4fa68 JA |
1051 | [IORING_OP_SHUTDOWN] = { |
1052 | .needs_file = 1, | |
1053 | }, | |
44526bed JA |
1054 | [IORING_OP_RENAMEAT] = {}, |
1055 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1056 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1057 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1058 | [IORING_OP_LINKAT] = {}, |
d3656344 JA |
1059 | }; |
1060 | ||
0756a869 PB |
1061 | /* requests with any of those set should undergo io_disarm_next() */ |
1062 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1063 | ||
7a612350 | 1064 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1065 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1066 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1067 | struct task_struct *task, | |
3dd0c97a | 1068 | bool cancel_all); |
78cc687b | 1069 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1070 | |
d4d19c19 | 1071 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1072 | s32 res, u32 cflags); |
ec9c02ad | 1073 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1074 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1075 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1076 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1077 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1078 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1079 | unsigned nr_args); |
68fb8979 | 1080 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1081 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1082 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1083 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1084 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1085 | |
907d1df3 | 1086 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1087 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1088 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1089 | |
b9445598 PB |
1090 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1091 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1092 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1093 | ||
f1042b6c | 1094 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1095 | |
2b188cc1 JA |
1096 | static struct kmem_cache *req_cachep; |
1097 | ||
0918682b | 1098 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1099 | |
1100 | struct sock *io_uring_get_socket(struct file *file) | |
1101 | { | |
1102 | #if defined(CONFIG_UNIX) | |
1103 | if (file->f_op == &io_uring_fops) { | |
1104 | struct io_ring_ctx *ctx = file->private_data; | |
1105 | ||
1106 | return ctx->ring_sock->sk; | |
1107 | } | |
1108 | #endif | |
1109 | return NULL; | |
1110 | } | |
1111 | EXPORT_SYMBOL(io_uring_get_socket); | |
1112 | ||
f237c30a PB |
1113 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1114 | { | |
1115 | if (!*locked) { | |
1116 | mutex_lock(&ctx->uring_lock); | |
1117 | *locked = true; | |
1118 | } | |
1119 | } | |
1120 | ||
f2f87370 PB |
1121 | #define io_for_each_link(pos, head) \ |
1122 | for (pos = (head); pos; pos = pos->link) | |
1123 | ||
21c843d5 PB |
1124 | /* |
1125 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1126 | * see commit f958d7b528b1 for details. | |
1127 | */ | |
1128 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1129 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1130 | ||
1131 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1132 | { | |
20e60a38 | 1133 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1134 | return atomic_inc_not_zero(&req->refs); |
1135 | } | |
1136 | ||
21c843d5 PB |
1137 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1138 | { | |
20e60a38 PB |
1139 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1140 | return true; | |
1141 | ||
21c843d5 PB |
1142 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1143 | return atomic_dec_and_test(&req->refs); | |
1144 | } | |
1145 | ||
1146 | static inline void req_ref_put(struct io_kiocb *req) | |
1147 | { | |
20e60a38 | 1148 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1149 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1150 | } | |
1151 | ||
1152 | static inline void req_ref_get(struct io_kiocb *req) | |
1153 | { | |
20e60a38 | 1154 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1155 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1156 | atomic_inc(&req->refs); | |
1157 | } | |
1158 | ||
c450178d PB |
1159 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1160 | { | |
6f33b0bc | 1161 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1162 | __io_submit_flush_completions(ctx); |
1163 | } | |
1164 | ||
48dcd38d | 1165 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1166 | { |
1167 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1168 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1169 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1170 | } |
1171 | } | |
1172 | ||
48dcd38d PB |
1173 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1174 | { | |
1175 | __io_req_set_refcount(req, 1); | |
1176 | } | |
1177 | ||
ab409402 PB |
1178 | #define IO_RSRC_REF_BATCH 100 |
1179 | ||
1180 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, | |
1181 | struct io_ring_ctx *ctx) | |
1182 | __must_hold(&ctx->uring_lock) | |
1183 | { | |
1184 | struct percpu_ref *ref = req->fixed_rsrc_refs; | |
1185 | ||
1186 | if (ref) { | |
1187 | if (ref == &ctx->rsrc_node->refs) | |
1188 | ctx->rsrc_cached_refs++; | |
1189 | else | |
1190 | percpu_ref_put(ref); | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | static inline void io_req_put_rsrc(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1195 | { | |
1196 | if (req->fixed_rsrc_refs) | |
1197 | percpu_ref_put(req->fixed_rsrc_refs); | |
1198 | } | |
1199 | ||
1200 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1201 | __must_hold(&ctx->uring_lock) | |
1202 | { | |
1203 | if (ctx->rsrc_cached_refs) { | |
1204 | percpu_ref_put_many(&ctx->rsrc_node->refs, ctx->rsrc_cached_refs); | |
1205 | ctx->rsrc_cached_refs = 0; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1210 | __must_hold(&ctx->uring_lock) | |
1211 | { | |
1212 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1213 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1214 | } | |
1215 | ||
a46be971 PB |
1216 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
1217 | struct io_ring_ctx *ctx) | |
36f72fe2 | 1218 | { |
269bbe5f | 1219 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1220 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
ab409402 PB |
1221 | ctx->rsrc_cached_refs--; |
1222 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1223 | io_rsrc_refs_refill(ctx); | |
36f72fe2 PB |
1224 | } |
1225 | } | |
1226 | ||
f70865db PB |
1227 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1228 | { | |
1229 | bool got = percpu_ref_tryget(ref); | |
1230 | ||
1231 | /* already at zero, wait for ->release() */ | |
1232 | if (!got) | |
1233 | wait_for_completion(compl); | |
1234 | percpu_ref_resurrect(ref); | |
1235 | if (got) | |
1236 | percpu_ref_put(ref); | |
1237 | } | |
1238 | ||
3dd0c97a PB |
1239 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1240 | bool cancel_all) | |
08d23634 PB |
1241 | { |
1242 | struct io_kiocb *req; | |
1243 | ||
68207680 | 1244 | if (task && head->task != task) |
08d23634 | 1245 | return false; |
3dd0c97a | 1246 | if (cancel_all) |
08d23634 PB |
1247 | return true; |
1248 | ||
1249 | io_for_each_link(req, head) { | |
b05a1bcd | 1250 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1251 | return true; |
08d23634 PB |
1252 | } |
1253 | return false; | |
1254 | } | |
1255 | ||
d886e185 PB |
1256 | static inline bool req_has_async_data(struct io_kiocb *req) |
1257 | { | |
1258 | return req->flags & REQ_F_ASYNC_DATA; | |
1259 | } | |
1260 | ||
93d2bcd2 | 1261 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1262 | { |
93d2bcd2 | 1263 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1264 | } |
4a38aed2 | 1265 | |
a8295b98 HX |
1266 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1267 | { | |
1268 | req_set_fail(req); | |
1269 | req->result = res; | |
1270 | } | |
1271 | ||
c072481d | 1272 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1273 | { |
1274 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1275 | ||
0f158b4c | 1276 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1277 | } |
1278 | ||
8eb7e2d0 PB |
1279 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1280 | { | |
1281 | return !req->timeout.off; | |
1282 | } | |
1283 | ||
c072481d | 1284 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1285 | { |
1286 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1287 | fallback_work.work); | |
1288 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1289 | struct io_kiocb *req, *tmp; | |
f237c30a | 1290 | bool locked = false; |
f56165e6 PB |
1291 | |
1292 | percpu_ref_get(&ctx->refs); | |
1293 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1294 | req->io_task_work.func(req, &locked); |
5636c00d | 1295 | |
f237c30a | 1296 | if (locked) { |
c450178d | 1297 | io_submit_flush_completions(ctx); |
f237c30a PB |
1298 | mutex_unlock(&ctx->uring_lock); |
1299 | } | |
f56165e6 PB |
1300 | percpu_ref_put(&ctx->refs); |
1301 | } | |
1302 | ||
c072481d | 1303 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1304 | { |
1305 | struct io_ring_ctx *ctx; | |
78076bb6 | 1306 | int hash_bits; |
2b188cc1 JA |
1307 | |
1308 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1309 | if (!ctx) | |
1310 | return NULL; | |
1311 | ||
78076bb6 JA |
1312 | /* |
1313 | * Use 5 bits less than the max cq entries, that should give us around | |
1314 | * 32 entries per hash list if totally full and uniformly spread. | |
1315 | */ | |
1316 | hash_bits = ilog2(p->cq_entries); | |
1317 | hash_bits -= 5; | |
1318 | if (hash_bits <= 0) | |
1319 | hash_bits = 1; | |
1320 | ctx->cancel_hash_bits = hash_bits; | |
1321 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1322 | GFP_KERNEL); | |
1323 | if (!ctx->cancel_hash) | |
1324 | goto err; | |
1325 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1326 | ||
6224843d PB |
1327 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1328 | if (!ctx->dummy_ubuf) | |
1329 | goto err; | |
1330 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1331 | ctx->dummy_ubuf->ubuf = -1UL; | |
1332 | ||
21482896 | 1333 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1334 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1335 | goto err; | |
2b188cc1 JA |
1336 | |
1337 | ctx->flags = p->flags; | |
90554200 | 1338 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1339 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1340 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1341 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1342 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1343 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1344 | mutex_init(&ctx->uring_lock); |
311997b3 | 1345 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1346 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1347 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1348 | INIT_WQ_LIST(&ctx->iopoll_list); |
de0617e4 | 1349 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1350 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1351 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1352 | spin_lock_init(&ctx->rsrc_ref_lock); |
1353 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1354 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1355 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1356 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1357 | ctx->submit_state.free_list.next = NULL; |
1358 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1359 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1360 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1361 | return ctx; |
206aefde | 1362 | err: |
6224843d | 1363 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1364 | kfree(ctx->cancel_hash); |
206aefde JA |
1365 | kfree(ctx); |
1366 | return NULL; | |
2b188cc1 JA |
1367 | } |
1368 | ||
8f6ed49a PB |
1369 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1370 | { | |
1371 | struct io_rings *r = ctx->rings; | |
1372 | ||
1373 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1374 | ctx->cq_extra--; | |
1375 | } | |
1376 | ||
9cf7c104 | 1377 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1378 | { |
2bc9930e JA |
1379 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1380 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1381 | |
8f6ed49a | 1382 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1383 | } |
de0617e4 | 1384 | |
9d858b21 | 1385 | return false; |
de0617e4 JA |
1386 | } |
1387 | ||
c97d8a0f PB |
1388 | #define FFS_ASYNC_READ 0x1UL |
1389 | #define FFS_ASYNC_WRITE 0x2UL | |
1390 | #ifdef CONFIG_64BIT | |
1391 | #define FFS_ISREG 0x4UL | |
1392 | #else | |
1393 | #define FFS_ISREG 0x0UL | |
1394 | #endif | |
1395 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
1396 | ||
1397 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1398 | { | |
1399 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); | |
1400 | } | |
1401 | ||
c072481d | 1402 | static inline void io_req_track_inflight(struct io_kiocb *req) |
ce3d5aae | 1403 | { |
ce3d5aae | 1404 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1405 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1406 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1407 | } |
1408 | } | |
1409 | ||
906c6caa PB |
1410 | static inline void io_unprep_linked_timeout(struct io_kiocb *req) |
1411 | { | |
1412 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
1413 | } | |
1414 | ||
fd08e530 PB |
1415 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1416 | { | |
906c6caa PB |
1417 | if (WARN_ON_ONCE(!req->link)) |
1418 | return NULL; | |
1419 | ||
4d13d1a4 PB |
1420 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1421 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1422 | |
1423 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1424 | io_req_set_refcount(req); |
4d13d1a4 PB |
1425 | __io_req_set_refcount(req->link, 2); |
1426 | return req->link; | |
fd08e530 PB |
1427 | } |
1428 | ||
1429 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1430 | { | |
4d13d1a4 | 1431 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1432 | return NULL; |
1433 | return __io_prep_linked_timeout(req); | |
1434 | } | |
1435 | ||
1e6fa521 JA |
1436 | static void io_prep_async_work(struct io_kiocb *req) |
1437 | { | |
1438 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1439 | struct io_ring_ctx *ctx = req->ctx; |
1440 | ||
b8e64b53 PB |
1441 | if (!(req->flags & REQ_F_CREDS)) { |
1442 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1443 | req->creds = get_current_cred(); |
b8e64b53 | 1444 | } |
003e8dcc | 1445 | |
e1d675df PB |
1446 | req->work.list.next = NULL; |
1447 | req->work.flags = 0; | |
feaadc4f PB |
1448 | if (req->flags & REQ_F_FORCE_ASYNC) |
1449 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1450 | ||
1e6fa521 JA |
1451 | if (req->flags & REQ_F_ISREG) { |
1452 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1453 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1454 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1455 | if (def->unbound_nonreg_file) |
1456 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1457 | } | |
e1d675df PB |
1458 | |
1459 | switch (req->opcode) { | |
1460 | case IORING_OP_SPLICE: | |
1461 | case IORING_OP_TEE: | |
e1d675df PB |
1462 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1463 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1464 | break; | |
1465 | } | |
561fb04a | 1466 | } |
cccf0ee8 | 1467 | |
cbdcb435 | 1468 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1469 | { |
cbdcb435 | 1470 | struct io_kiocb *cur; |
54a91f3b | 1471 | |
44eff40a PB |
1472 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1473 | struct io_ring_ctx *ctx = req->ctx; | |
1474 | ||
79ebeaee | 1475 | spin_lock(&ctx->completion_lock); |
44eff40a PB |
1476 | io_for_each_link(cur, req) |
1477 | io_prep_async_work(cur); | |
79ebeaee | 1478 | spin_unlock(&ctx->completion_lock); |
44eff40a PB |
1479 | } else { |
1480 | io_for_each_link(cur, req) | |
1481 | io_prep_async_work(cur); | |
1482 | } | |
561fb04a JA |
1483 | } |
1484 | ||
fff4e40e PB |
1485 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1486 | { | |
1487 | struct io_submit_state *state = &req->ctx->submit_state; | |
1488 | ||
1489 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); | |
1490 | } | |
1491 | ||
f237c30a | 1492 | static void io_queue_async_work(struct io_kiocb *req, bool *locked) |
561fb04a | 1493 | { |
a197f664 | 1494 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1495 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1496 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1497 | |
f237c30a PB |
1498 | /* must not take the lock, NULL it as a precaution */ |
1499 | locked = NULL; | |
1500 | ||
3bfe6106 JA |
1501 | BUG_ON(!tctx); |
1502 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1503 | |
cbdcb435 PB |
1504 | /* init ->work of the whole link before punting */ |
1505 | io_prep_async_link(req); | |
991468dc JA |
1506 | |
1507 | /* | |
1508 | * Not expected to happen, but if we do have a bug where this _can_ | |
1509 | * happen, catch it here and ensure the request is marked as | |
1510 | * canceled. That will make io-wq go through the usual work cancel | |
1511 | * procedure rather than attempt to run this request (or create a new | |
1512 | * worker for it). | |
1513 | */ | |
1514 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1515 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1516 | ||
d07f1e8a PB |
1517 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1518 | &req->work, req->flags); | |
ebf93667 | 1519 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1520 | if (link) |
1521 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1522 | } |
1523 | ||
1ee4160c | 1524 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1525 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1526 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1527 | { |
e8c2bc1f | 1528 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1529 | |
fd9c7bc5 | 1530 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1531 | if (status) |
1532 | req_set_fail(req); | |
01cec8c1 PB |
1533 | atomic_set(&req->ctx->cq_timeouts, |
1534 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1535 | list_del_init(&req->timeout.list); |
d4d19c19 | 1536 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
91c2f697 | 1537 | io_put_req_deferred(req); |
5262f567 JA |
1538 | } |
1539 | } | |
1540 | ||
c072481d | 1541 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1542 | { |
441b8a78 | 1543 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1544 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1545 | struct io_defer_entry, list); | |
de0617e4 | 1546 | |
9cf7c104 | 1547 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1548 | break; |
27dc8338 | 1549 | list_del_init(&de->list); |
907d1df3 | 1550 | io_req_task_queue(de->req); |
27dc8338 | 1551 | kfree(de); |
441b8a78 | 1552 | } |
04518945 PB |
1553 | } |
1554 | ||
c072481d | 1555 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1556 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1557 | { |
441b8a78 | 1558 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1559 | |
79ebeaee | 1560 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1561 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1562 | u32 events_needed, events_got; |
360428f8 | 1563 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1564 | struct io_kiocb, timeout.list); |
de0617e4 | 1565 | |
8eb7e2d0 | 1566 | if (io_is_timeout_noseq(req)) |
360428f8 | 1567 | break; |
f010505b MDG |
1568 | |
1569 | /* | |
1570 | * Since seq can easily wrap around over time, subtract | |
1571 | * the last seq at which timeouts were flushed before comparing. | |
1572 | * Assuming not more than 2^31-1 events have happened since, | |
1573 | * these subtractions won't have wrapped, so we can check if | |
1574 | * target is in [last_seq, current_seq] by comparing the two. | |
1575 | */ | |
1576 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1577 | events_got = seq - ctx->cq_last_tm_flush; | |
1578 | if (events_got < events_needed) | |
360428f8 | 1579 | break; |
bfe68a22 | 1580 | |
135fcde8 | 1581 | list_del_init(&req->timeout.list); |
1ee4160c | 1582 | io_kill_timeout(req, 0); |
f18ee4cf | 1583 | } |
f010505b | 1584 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1585 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1586 | } |
5262f567 | 1587 | |
c072481d | 1588 | static __cold void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1589 | { |
2335f6f5 PB |
1590 | if (ctx->off_timeout_used) |
1591 | io_flush_timeouts(ctx); | |
1592 | if (ctx->drain_active) | |
1593 | io_queue_deferred(ctx); | |
1594 | } | |
1595 | ||
1596 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1597 | { | |
1598 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1599 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1600 | /* order cqe stores with ring update */ |
1601 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1602 | } |
1603 | ||
90554200 JA |
1604 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1605 | { | |
1606 | struct io_rings *r = ctx->rings; | |
1607 | ||
a566c556 | 1608 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1609 | } |
1610 | ||
888aae2e PB |
1611 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1612 | { | |
1613 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1614 | } | |
1615 | ||
d068b506 | 1616 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1617 | { |
75b28aff | 1618 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1619 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1620 | |
115e12e5 SB |
1621 | /* |
1622 | * writes to the cq entry need to come after reading head; the | |
1623 | * control dependency is enough as we're using WRITE_ONCE to | |
1624 | * fill the cq entry | |
1625 | */ | |
a566c556 | 1626 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1627 | return NULL; |
1628 | ||
888aae2e | 1629 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1630 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1631 | } |
1632 | ||
f2842ab5 JA |
1633 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1634 | { | |
44c769de | 1635 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1636 | return false; |
7e55a19c SG |
1637 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1638 | return false; | |
44c769de | 1639 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1640 | } |
1641 | ||
2c5d763c JA |
1642 | /* |
1643 | * This should only get called when at least one event has been posted. | |
1644 | * Some applications rely on the eventfd notification count only changing | |
1645 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1646 | * 1:1 relationship between how many times this function is called (and | |
1647 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1648 | */ | |
b41e9852 | 1649 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1650 | { |
5fd46178 JA |
1651 | /* |
1652 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1653 | * io_should_wake() handle the termination of the loop and only | |
1654 | * wake as many waiters as we need to. | |
1655 | */ | |
1656 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1657 | wake_up_all(&ctx->cq_wait); | |
b41e9852 | 1658 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1659 | eventfd_signal(ctx->cq_ev_fd, 1); |
1660 | } | |
1661 | ||
80c18e4a PB |
1662 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1663 | { | |
c57a91fb PB |
1664 | /* see waitqueue_active() comment */ |
1665 | smp_mb(); | |
1666 | ||
80c18e4a | 1667 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c57a91fb | 1668 | if (waitqueue_active(&ctx->cq_wait)) |
5fd46178 | 1669 | wake_up_all(&ctx->cq_wait); |
80c18e4a PB |
1670 | } |
1671 | if (io_should_trigger_evfd(ctx)) | |
1672 | eventfd_signal(ctx->cq_ev_fd, 1); | |
1673 | } | |
1674 | ||
c4a2ed72 | 1675 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1676 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1677 | { |
b18032bb | 1678 | bool all_flushed, posted; |
1d7bb1d5 | 1679 | |
a566c556 | 1680 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1681 | return false; |
1d7bb1d5 | 1682 | |
b18032bb | 1683 | posted = false; |
79ebeaee | 1684 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1685 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1686 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1687 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1688 | |
1d7bb1d5 JA |
1689 | if (!cqe && !force) |
1690 | break; | |
6c2450ae PB |
1691 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1692 | struct io_overflow_cqe, list); | |
1693 | if (cqe) | |
1694 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1695 | else | |
8f6ed49a PB |
1696 | io_account_cq_overflow(ctx); |
1697 | ||
b18032bb | 1698 | posted = true; |
6c2450ae PB |
1699 | list_del(&ocqe->list); |
1700 | kfree(ocqe); | |
1d7bb1d5 JA |
1701 | } |
1702 | ||
09e88404 PB |
1703 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1704 | if (all_flushed) { | |
5ed7a37d | 1705 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1706 | WRITE_ONCE(ctx->rings->sq_flags, |
1707 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1708 | } |
46930143 | 1709 | |
b18032bb JA |
1710 | if (posted) |
1711 | io_commit_cqring(ctx); | |
79ebeaee | 1712 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1713 | if (posted) |
1714 | io_cqring_ev_posted(ctx); | |
09e88404 | 1715 | return all_flushed; |
1d7bb1d5 JA |
1716 | } |
1717 | ||
90f67366 | 1718 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1719 | { |
ca0a2651 JA |
1720 | bool ret = true; |
1721 | ||
5ed7a37d | 1722 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1723 | /* iopoll syncs against uring_lock, not completion_lock */ |
1724 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1725 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1726 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1727 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1728 | mutex_unlock(&ctx->uring_lock); | |
1729 | } | |
ca0a2651 JA |
1730 | |
1731 | return ret; | |
6c503150 PB |
1732 | } |
1733 | ||
6a290a14 PB |
1734 | /* must to be called somewhat shortly after putting a request */ |
1735 | static inline void io_put_task(struct task_struct *task, int nr) | |
1736 | { | |
1737 | struct io_uring_task *tctx = task->io_uring; | |
1738 | ||
e98e49b2 PB |
1739 | if (likely(task == current)) { |
1740 | tctx->cached_refs += nr; | |
1741 | } else { | |
1742 | percpu_counter_sub(&tctx->inflight, nr); | |
1743 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1744 | wake_up(&tctx->wait); | |
1745 | put_task_struct_many(task, nr); | |
1746 | } | |
6a290a14 PB |
1747 | } |
1748 | ||
9a10867a PB |
1749 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1750 | { | |
1751 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1752 | ||
1753 | percpu_counter_add(&tctx->inflight, refill); | |
1754 | refcount_add(refill, ¤t->usage); | |
1755 | tctx->cached_refs += refill; | |
1756 | } | |
1757 | ||
1758 | static inline void io_get_task_refs(int nr) | |
1759 | { | |
1760 | struct io_uring_task *tctx = current->io_uring; | |
1761 | ||
1762 | tctx->cached_refs -= nr; | |
1763 | if (unlikely(tctx->cached_refs < 0)) | |
1764 | io_task_refs_refill(tctx); | |
1765 | } | |
1766 | ||
d4d19c19 | 1767 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1768 | s32 res, u32 cflags) |
2b188cc1 | 1769 | { |
cce4b8b0 | 1770 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1771 | |
cce4b8b0 PB |
1772 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1773 | if (!ocqe) { | |
1774 | /* | |
1775 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1776 | * or cannot allocate an overflow entry, then we need to drop it | |
1777 | * on the floor. | |
1778 | */ | |
8f6ed49a | 1779 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1780 | return false; |
2b188cc1 | 1781 | } |
cce4b8b0 | 1782 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1783 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1784 | WRITE_ONCE(ctx->rings->sq_flags, |
1785 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1786 | ||
cce4b8b0 | 1787 | } |
d4d19c19 | 1788 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1789 | ocqe->cqe.res = res; |
1790 | ocqe->cqe.flags = cflags; | |
1791 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1792 | return true; | |
2b188cc1 JA |
1793 | } |
1794 | ||
d4d19c19 | 1795 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1796 | s32 res, u32 cflags) |
2b188cc1 JA |
1797 | { |
1798 | struct io_uring_cqe *cqe; | |
1799 | ||
d4d19c19 | 1800 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1801 | |
2b188cc1 JA |
1802 | /* |
1803 | * If we can't get a cq entry, userspace overflowed the | |
1804 | * submission (by quite a lot). Increment the overflow count in | |
1805 | * the ring. | |
1806 | */ | |
d068b506 | 1807 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1808 | if (likely(cqe)) { |
d4d19c19 | 1809 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1810 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1811 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1812 | return true; |
2b188cc1 | 1813 | } |
d4d19c19 | 1814 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1815 | } |
1816 | ||
8d13326e | 1817 | /* not as hot to bloat with inlining */ |
d4d19c19 | 1818 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1819 | s32 res, u32 cflags) |
bcda7baa | 1820 | { |
d4d19c19 | 1821 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1822 | } |
1823 | ||
54daa9b2 PB |
1824 | static void io_req_complete_post(struct io_kiocb *req, s32 res, |
1825 | u32 cflags) | |
2b188cc1 | 1826 | { |
78e19bbe | 1827 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1828 | |
79ebeaee | 1829 | spin_lock(&ctx->completion_lock); |
d4d19c19 | 1830 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1831 | /* |
1832 | * If we're the last reference to this request, add to our locked | |
1833 | * free_list cache. | |
1834 | */ | |
de9b4cca | 1835 | if (req_ref_put_and_test(req)) { |
7a612350 | 1836 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1837 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1838 | io_disarm_next(req); |
1839 | if (req->link) { | |
1840 | io_req_task_queue(req->link); | |
1841 | req->link = NULL; | |
1842 | } | |
1843 | } | |
ab409402 | 1844 | io_req_put_rsrc(req, ctx); |
c7dae4ba JA |
1845 | io_dismantle_req(req); |
1846 | io_put_task(req->task, 1); | |
c2b6c6bc | 1847 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 1848 | ctx->locked_free_nr++; |
180f829f | 1849 | } |
7a612350 | 1850 | io_commit_cqring(ctx); |
79ebeaee | 1851 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 1852 | io_cqring_ev_posted(ctx); |
229a7b63 JA |
1853 | } |
1854 | ||
54daa9b2 PB |
1855 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
1856 | u32 cflags) | |
229a7b63 | 1857 | { |
a38d68db | 1858 | req->result = res; |
d17e56eb | 1859 | req->cflags = cflags; |
e342c807 | 1860 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1861 | } |
1862 | ||
889fca73 | 1863 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 1864 | s32 res, u32 cflags) |
bcda7baa | 1865 | { |
889fca73 PB |
1866 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1867 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1868 | else |
c7dae4ba | 1869 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1870 | } |
1871 | ||
54daa9b2 | 1872 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 1873 | { |
889fca73 | 1874 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1875 | } |
1876 | ||
54daa9b2 | 1877 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 1878 | { |
93d2bcd2 | 1879 | req_set_fail(req); |
f41db273 PB |
1880 | io_req_complete_post(req, res, 0); |
1881 | } | |
1882 | ||
c6d3d9cb PB |
1883 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1884 | { | |
1885 | /* | |
1886 | * We don't submit, fail them all, for that replace hardlinks with | |
1887 | * normal links. Extra REQ_F_LINK is tolerated. | |
1888 | */ | |
1889 | req->flags &= ~REQ_F_HARDLINK; | |
1890 | req->flags |= REQ_F_LINK; | |
1891 | io_req_complete_failed(req, req->result); | |
1892 | } | |
1893 | ||
864ea921 PB |
1894 | /* |
1895 | * Don't initialise the fields below on every allocation, but do that in | |
1896 | * advance and keep them valid across allocations. | |
1897 | */ | |
1898 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1899 | { | |
1900 | req->ctx = ctx; | |
1901 | req->link = NULL; | |
1902 | req->async_data = NULL; | |
1903 | /* not necessary, but safer to zero */ | |
1904 | req->result = 0; | |
1905 | } | |
1906 | ||
dac7a098 | 1907 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1908 | struct io_submit_state *state) |
dac7a098 | 1909 | { |
79ebeaee | 1910 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 1911 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1912 | ctx->locked_free_nr = 0; |
79ebeaee | 1913 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1914 | } |
1915 | ||
dd78f492 | 1916 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1917 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1918 | { |
c7dae4ba | 1919 | struct io_submit_state *state = &ctx->submit_state; |
0ddf92e8 | 1920 | |
c7dae4ba JA |
1921 | /* |
1922 | * If we have more than a batch's worth of requests in our IRQ side | |
1923 | * locked cache, grab the lock and move them over to our submission | |
1924 | * side cache. | |
1925 | */ | |
d0acdee2 | 1926 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 1927 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc | 1928 | return !!state->free_list.next; |
0ddf92e8 JA |
1929 | } |
1930 | ||
5d5901a3 PB |
1931 | /* |
1932 | * A request might get retired back into the request caches even before opcode | |
1933 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
1934 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
1935 | * and with extra caution to not get a request that is still worked on. | |
1936 | */ | |
c072481d | 1937 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 1938 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 1939 | { |
e5d1bc0a | 1940 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 | 1941 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 PB |
1942 | void *reqs[IO_REQ_ALLOC_BATCH]; |
1943 | struct io_kiocb *req; | |
864ea921 | 1944 | int ret, i; |
e5d1bc0a | 1945 | |
c2b6c6bc | 1946 | if (likely(state->free_list.next || io_flush_cached_reqs(ctx))) |
a33ae9ce | 1947 | return true; |
e5d1bc0a | 1948 | |
3ab665b7 | 1949 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 1950 | |
864ea921 PB |
1951 | /* |
1952 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1953 | * retry single alloc to be on the safe side. | |
1954 | */ | |
1955 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
1956 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
1957 | if (!reqs[0]) | |
a33ae9ce | 1958 | return false; |
864ea921 | 1959 | ret = 1; |
2b188cc1 | 1960 | } |
864ea921 | 1961 | |
37f0e767 | 1962 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 PB |
1963 | for (i = 0; i < ret; i++) { |
1964 | req = reqs[i]; | |
1965 | ||
1966 | io_preinit_req(req, ctx); | |
c2b6c6bc | 1967 | wq_stack_add_head(&req->comp_list, &state->free_list); |
3ab665b7 | 1968 | } |
a33ae9ce PB |
1969 | return true; |
1970 | } | |
1971 | ||
1972 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
1973 | { | |
1974 | if (unlikely(!ctx->submit_state.free_list.next)) | |
1975 | return __io_alloc_req_refill(ctx); | |
1976 | return true; | |
1977 | } | |
1978 | ||
1979 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
1980 | { | |
1981 | struct io_wq_work_node *node; | |
1982 | ||
1983 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 1984 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
1985 | } |
1986 | ||
e1d767f0 | 1987 | static inline void io_put_file(struct file *file) |
8da11c19 | 1988 | { |
e1d767f0 | 1989 | if (file) |
8da11c19 PB |
1990 | fput(file); |
1991 | } | |
1992 | ||
6b639522 | 1993 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1994 | { |
094bae49 | 1995 | unsigned int flags = req->flags; |
929a3af9 | 1996 | |
867f8fa5 | 1997 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 1998 | io_clean_op(req); |
e1d767f0 PB |
1999 | if (!(flags & REQ_F_FIXED_FILE)) |
2000 | io_put_file(req->file); | |
e65ef56d JA |
2001 | } |
2002 | ||
c072481d | 2003 | static __cold void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2004 | { |
51a4cc11 | 2005 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2006 | |
ab409402 | 2007 | io_req_put_rsrc(req, ctx); |
216578e5 | 2008 | io_dismantle_req(req); |
7c660731 | 2009 | io_put_task(req->task, 1); |
c6ca97b3 | 2010 | |
79ebeaee | 2011 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2012 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2013 | ctx->locked_free_nr++; |
79ebeaee | 2014 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2015 | } |
2016 | ||
f2f87370 PB |
2017 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2018 | { | |
2019 | struct io_kiocb *nxt = req->link; | |
2020 | ||
2021 | req->link = nxt->link; | |
2022 | nxt->link = NULL; | |
2023 | } | |
2024 | ||
33cc89a9 PB |
2025 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2026 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2027 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2028 | { |
33cc89a9 | 2029 | struct io_kiocb *link = req->link; |
f2f87370 | 2030 | |
b97e736a | 2031 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2032 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2033 | |
f2f87370 | 2034 | io_remove_next_linked(req); |
90cd7e42 | 2035 | link->timeout.head = NULL; |
fd9c7bc5 | 2036 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2037 | list_del(&link->timeout.list); |
d4d19c19 PB |
2038 | io_cqring_fill_event(link->ctx, link->user_data, |
2039 | -ECANCELED, 0); | |
91c2f697 | 2040 | io_put_req_deferred(link); |
d4729fbd | 2041 | return true; |
c9abd7ad PB |
2042 | } |
2043 | } | |
d4729fbd | 2044 | return false; |
7c86ffee PB |
2045 | } |
2046 | ||
d148ca4b | 2047 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2048 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2049 | { |
33cc89a9 | 2050 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 2051 | |
f2f87370 | 2052 | req->link = NULL; |
f2f87370 | 2053 | while (link) { |
a8295b98 HX |
2054 | long res = -ECANCELED; |
2055 | ||
2056 | if (link->flags & REQ_F_FAIL) | |
2057 | res = link->result; | |
2058 | ||
f2f87370 PB |
2059 | nxt = link->link; |
2060 | link->link = NULL; | |
2665abfd | 2061 | |
f2f87370 | 2062 | trace_io_uring_fail_link(req, link); |
a8295b98 | 2063 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
91c2f697 | 2064 | io_put_req_deferred(link); |
f2f87370 | 2065 | link = nxt; |
9e645e11 | 2066 | } |
33cc89a9 | 2067 | } |
9e645e11 | 2068 | |
33cc89a9 PB |
2069 | static bool io_disarm_next(struct io_kiocb *req) |
2070 | __must_hold(&req->ctx->completion_lock) | |
2071 | { | |
2072 | bool posted = false; | |
2073 | ||
0756a869 PB |
2074 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2075 | struct io_kiocb *link = req->link; | |
2076 | ||
906c6caa | 2077 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2078 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2079 | io_remove_next_linked(req); | |
2080 | io_cqring_fill_event(link->ctx, link->user_data, | |
2081 | -ECANCELED, 0); | |
2082 | io_put_req_deferred(link); | |
2083 | posted = true; | |
2084 | } | |
2085 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2086 | struct io_ring_ctx *ctx = req->ctx; |
2087 | ||
2088 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2089 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2090 | spin_unlock_irq(&ctx->timeout_lock); |
2091 | } | |
93d2bcd2 | 2092 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2093 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2094 | posted |= (req->link != NULL); |
2095 | io_fail_links(req); | |
2096 | } | |
2097 | return posted; | |
9e645e11 JA |
2098 | } |
2099 | ||
d81499bf PB |
2100 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2101 | { | |
2102 | struct io_ring_ctx *ctx = req->ctx; | |
2103 | bool posted; | |
2104 | ||
2105 | spin_lock(&ctx->completion_lock); | |
2106 | posted = io_disarm_next(req); | |
2107 | if (posted) | |
2108 | io_commit_cqring(req->ctx); | |
2109 | spin_unlock(&ctx->completion_lock); | |
2110 | if (posted) | |
2111 | io_cqring_ev_posted(ctx); | |
2112 | } | |
2113 | ||
2114 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2115 | { |
33cc89a9 | 2116 | struct io_kiocb *nxt; |
944e58bf | 2117 | |
d81499bf PB |
2118 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
2119 | return NULL; | |
9e645e11 JA |
2120 | /* |
2121 | * If LINK is set, we have dependent requests in this chain. If we | |
2122 | * didn't fail this request, queue the first one up, moving any other | |
2123 | * dependencies to the next request. In case of failure, fail the rest | |
2124 | * of the chain. | |
2125 | */ | |
d81499bf PB |
2126 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2127 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2128 | nxt = req->link; |
2129 | req->link = NULL; | |
2130 | return nxt; | |
4d7dd462 | 2131 | } |
9e645e11 | 2132 | |
f237c30a | 2133 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2134 | { |
2135 | if (!ctx) | |
2136 | return; | |
f237c30a | 2137 | if (*locked) { |
c450178d | 2138 | io_submit_flush_completions(ctx); |
2c32395d | 2139 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2140 | *locked = false; |
2c32395d PB |
2141 | } |
2142 | percpu_ref_put(&ctx->refs); | |
2143 | } | |
2144 | ||
7cbf1722 | 2145 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2146 | { |
f237c30a | 2147 | bool locked = false; |
ebd0df2e | 2148 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2149 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2150 | task_work); | |
c40f6379 | 2151 | |
16f72070 | 2152 | while (1) { |
3f18407d PB |
2153 | struct io_wq_work_node *node; |
2154 | ||
c450178d | 2155 | if (!tctx->task_list.first && locked) |
8d4ad41e PB |
2156 | io_submit_flush_completions(ctx); |
2157 | ||
3f18407d | 2158 | spin_lock_irq(&tctx->task_lock); |
c6538be9 | 2159 | node = tctx->task_list.first; |
3f18407d | 2160 | INIT_WQ_LIST(&tctx->task_list); |
6294f368 PB |
2161 | if (!node) |
2162 | tctx->task_running = false; | |
3f18407d | 2163 | spin_unlock_irq(&tctx->task_lock); |
6294f368 PB |
2164 | if (!node) |
2165 | break; | |
3f18407d | 2166 | |
6294f368 | 2167 | do { |
3f18407d PB |
2168 | struct io_wq_work_node *next = node->next; |
2169 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2170 | io_task_work.node); | |
2171 | ||
2172 | if (req->ctx != ctx) { | |
f237c30a | 2173 | ctx_flush_and_put(ctx, &locked); |
3f18407d | 2174 | ctx = req->ctx; |
126180b9 PB |
2175 | /* if not contended, grab and improve batching */ |
2176 | locked = mutex_trylock(&ctx->uring_lock); | |
3f18407d PB |
2177 | percpu_ref_get(&ctx->refs); |
2178 | } | |
f237c30a | 2179 | req->io_task_work.func(req, &locked); |
3f18407d | 2180 | node = next; |
6294f368 PB |
2181 | } while (node); |
2182 | ||
7cbf1722 | 2183 | cond_resched(); |
3f18407d | 2184 | } |
ebd0df2e | 2185 | |
f237c30a | 2186 | ctx_flush_and_put(ctx, &locked); |
7cbf1722 JA |
2187 | } |
2188 | ||
e09ee510 | 2189 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 2190 | { |
c15b79de | 2191 | struct task_struct *tsk = req->task; |
7cbf1722 | 2192 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2193 | enum task_work_notify_mode notify; |
e09ee510 | 2194 | struct io_wq_work_node *node; |
0b81e80c | 2195 | unsigned long flags; |
6294f368 | 2196 | bool running; |
7cbf1722 JA |
2197 | |
2198 | WARN_ON_ONCE(!tctx); | |
2199 | ||
0b81e80c | 2200 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2201 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
6294f368 PB |
2202 | running = tctx->task_running; |
2203 | if (!running) | |
2204 | tctx->task_running = true; | |
0b81e80c | 2205 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2206 | |
2207 | /* task_work already pending, we're done */ | |
6294f368 | 2208 | if (running) |
e09ee510 | 2209 | return; |
7cbf1722 | 2210 | |
c15b79de PB |
2211 | /* |
2212 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2213 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2214 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2215 | * will do the job. | |
2216 | */ | |
2217 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
d97ec623 PB |
2218 | if (likely(!task_work_add(tsk, &tctx->task_work, notify))) { |
2219 | if (notify == TWA_NONE) | |
2220 | wake_up_process(tsk); | |
e09ee510 | 2221 | return; |
c15b79de | 2222 | } |
2215bed9 | 2223 | |
0b81e80c | 2224 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2225 | tctx->task_running = false; |
e09ee510 PB |
2226 | node = tctx->task_list.first; |
2227 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2228 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2229 | |
e09ee510 PB |
2230 | while (node) { |
2231 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2232 | node = node->next; | |
2233 | if (llist_add(&req->io_task_work.fallback_node, | |
2234 | &req->ctx->fallback_llist)) | |
2235 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2236 | } | |
eab30c4d PB |
2237 | } |
2238 | ||
f237c30a | 2239 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2240 | { |
87ceb6a6 | 2241 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2242 | |
b18a1a45 | 2243 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2244 | io_tw_lock(ctx, locked); |
2593553a | 2245 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2246 | } |
2247 | ||
f237c30a | 2248 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2249 | { |
2250 | struct io_ring_ctx *ctx = req->ctx; | |
2251 | ||
f237c30a | 2252 | io_tw_lock(ctx, locked); |
316319e8 | 2253 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2254 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2255 | __io_queue_sqe(req); |
81b6d05c | 2256 | else |
2593553a | 2257 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2258 | } |
2259 | ||
2c4b8eb6 | 2260 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2261 | { |
2c4b8eb6 | 2262 | req->result = ret; |
5b0a6acc | 2263 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2264 | io_req_task_work_add(req); |
c40f6379 JA |
2265 | } |
2266 | ||
2c4b8eb6 | 2267 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2268 | { |
5b0a6acc | 2269 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2270 | io_req_task_work_add(req); |
a3df7698 PB |
2271 | } |
2272 | ||
773af691 JA |
2273 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2274 | { | |
2275 | req->io_task_work.func = io_queue_async_work; | |
2276 | io_req_task_work_add(req); | |
2277 | } | |
2278 | ||
f2f87370 | 2279 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2280 | { |
9b5f7bd9 | 2281 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2282 | |
2283 | if (nxt) | |
906a8c3f | 2284 | io_req_task_queue(nxt); |
c69f8dbe JL |
2285 | } |
2286 | ||
c3524383 | 2287 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2288 | { |
c3524383 PB |
2289 | io_queue_next(req); |
2290 | __io_free_req(req); | |
2291 | } | |
8766dd51 | 2292 | |
f237c30a PB |
2293 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2294 | { | |
2295 | io_free_req(req); | |
2296 | } | |
2297 | ||
3aa83bfb | 2298 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 2299 | struct io_wq_work_node *node) |
3aa83bfb PB |
2300 | __must_hold(&ctx->uring_lock) |
2301 | { | |
d4b7a5ef | 2302 | struct task_struct *task = NULL; |
37f0e767 | 2303 | int task_refs = 0; |
3aa83bfb | 2304 | |
3aa83bfb PB |
2305 | do { |
2306 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2307 | comp_list); | |
2308 | ||
def77acf | 2309 | if (unlikely(req->flags & REQ_F_REFCOUNT)) { |
c1e53a69 | 2310 | node = req->comp_list.next; |
def77acf PB |
2311 | if (!req_ref_put_and_test(req)) |
2312 | continue; | |
c1e53a69 | 2313 | } |
d4b7a5ef | 2314 | |
ab409402 | 2315 | io_req_put_rsrc_locked(req, ctx); |
d4b7a5ef PB |
2316 | io_queue_next(req); |
2317 | io_dismantle_req(req); | |
2318 | ||
2319 | if (req->task != task) { | |
2320 | if (task) | |
2321 | io_put_task(task, task_refs); | |
2322 | task = req->task; | |
2323 | task_refs = 0; | |
2324 | } | |
2325 | task_refs++; | |
c1e53a69 | 2326 | node = req->comp_list.next; |
d4b7a5ef | 2327 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
3aa83bfb | 2328 | } while (node); |
d4b7a5ef | 2329 | |
d4b7a5ef PB |
2330 | if (task) |
2331 | io_put_task(task, task_refs); | |
3aa83bfb PB |
2332 | } |
2333 | ||
c450178d | 2334 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2335 | __must_hold(&ctx->uring_lock) |
905c172f | 2336 | { |
6f33b0bc | 2337 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 2338 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 2339 | |
79ebeaee | 2340 | spin_lock(&ctx->completion_lock); |
6f33b0bc PB |
2341 | wq_list_for_each(node, prev, &state->compl_reqs) { |
2342 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2343 | comp_list); | |
5182ed2e | 2344 | |
d4d19c19 | 2345 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
d17e56eb | 2346 | req->cflags); |
905c172f PB |
2347 | } |
2348 | io_commit_cqring(ctx); | |
79ebeaee | 2349 | spin_unlock(&ctx->completion_lock); |
905c172f | 2350 | io_cqring_ev_posted(ctx); |
5182ed2e | 2351 | |
1cce17ac | 2352 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 2353 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
2354 | } |
2355 | ||
ba816ad6 JA |
2356 | /* |
2357 | * Drop reference to request, return next in chain (if there is one) if this | |
2358 | * was the last reference to this request. | |
2359 | */ | |
0d85035a | 2360 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2361 | { |
9b5f7bd9 PB |
2362 | struct io_kiocb *nxt = NULL; |
2363 | ||
de9b4cca | 2364 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2365 | nxt = io_req_find_next(req); |
4d7dd462 | 2366 | __io_free_req(req); |
2a44f467 | 2367 | } |
9b5f7bd9 | 2368 | return nxt; |
2b188cc1 JA |
2369 | } |
2370 | ||
0d85035a | 2371 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2372 | { |
de9b4cca | 2373 | if (req_ref_put_and_test(req)) |
e65ef56d | 2374 | io_free_req(req); |
2b188cc1 JA |
2375 | } |
2376 | ||
91c2f697 | 2377 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2378 | { |
91c2f697 | 2379 | if (req_ref_put_and_test(req)) { |
f237c30a | 2380 | req->io_task_work.func = io_free_req_work; |
543af3a1 PB |
2381 | io_req_task_work_add(req); |
2382 | } | |
216578e5 PB |
2383 | } |
2384 | ||
6c503150 | 2385 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2386 | { |
2387 | /* See comment at the top of this file */ | |
2388 | smp_rmb(); | |
e23de15f | 2389 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2390 | } |
2391 | ||
fb5ccc98 PB |
2392 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2393 | { | |
2394 | struct io_rings *rings = ctx->rings; | |
2395 | ||
2396 | /* make sure SQ entry isn't read before tail */ | |
2397 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2398 | } | |
2399 | ||
8ff069bf | 2400 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2401 | { |
8ff069bf | 2402 | unsigned int cflags; |
e94f141b | 2403 | |
bcda7baa JA |
2404 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2405 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2406 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2407 | kfree(kbuf); |
2408 | return cflags; | |
e94f141b JA |
2409 | } |
2410 | ||
8ff069bf | 2411 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2412 | { |
ae421d93 PB |
2413 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
2414 | return 0; | |
30d51dd4 | 2415 | return io_put_kbuf(req, req->kbuf); |
8ff069bf PB |
2416 | } |
2417 | ||
4c6e277c JA |
2418 | static inline bool io_run_task_work(void) |
2419 | { | |
ef98eb04 | 2420 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2421 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2422 | tracehook_notify_signal(); |
4c6e277c JA |
2423 | return true; |
2424 | } | |
2425 | ||
2426 | return false; | |
bcda7baa JA |
2427 | } |
2428 | ||
5ba3c874 | 2429 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 2430 | { |
5eef4e87 | 2431 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 2432 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 2433 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 2434 | int nr_events = 0; |
def596e9 JA |
2435 | |
2436 | /* | |
2437 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 2438 | * off our complete list. |
def596e9 | 2439 | */ |
87a115fb | 2440 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 2441 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2442 | |
5eef4e87 PB |
2443 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
2444 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 2445 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2446 | int ret; |
def596e9 JA |
2447 | |
2448 | /* | |
581f9810 BM |
2449 | * Move completed and retryable entries to our local lists. |
2450 | * If we find a request that requires polling, break out | |
2451 | * and complete those lists first, if we have entries there. | |
def596e9 | 2452 | */ |
e3f721e6 | 2453 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2454 | break; |
2455 | ||
b688f11e | 2456 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
2457 | if (unlikely(ret < 0)) |
2458 | return ret; | |
2459 | else if (ret) | |
ef99b2d3 | 2460 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2461 | |
3aadc23e | 2462 | /* iopoll may have completed current req */ |
b688f11e | 2463 | if (!rq_list_empty(iob.req_list) || |
e3f721e6 PB |
2464 | READ_ONCE(req->iopoll_completed)) |
2465 | break; | |
def596e9 JA |
2466 | } |
2467 | ||
b688f11e JA |
2468 | if (!rq_list_empty(iob.req_list)) |
2469 | iob.complete(&iob); | |
5eef4e87 PB |
2470 | else if (!pos) |
2471 | return 0; | |
2472 | ||
2473 | prev = start; | |
2474 | wq_list_for_each_resume(pos, prev) { | |
2475 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
2476 | ||
b3fa03fd PB |
2477 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
2478 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 2479 | break; |
b3fa03fd | 2480 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
f5ed3bcd | 2481 | io_put_rw_kbuf(req)); |
e3f721e6 PB |
2482 | nr_events++; |
2483 | } | |
def596e9 | 2484 | |
f5ed3bcd PB |
2485 | if (unlikely(!nr_events)) |
2486 | return 0; | |
2487 | ||
2488 | io_commit_cqring(ctx); | |
2489 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 2490 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 2491 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 2492 | io_free_batch_list(ctx, pos); |
5ba3c874 | 2493 | return nr_events; |
def596e9 JA |
2494 | } |
2495 | ||
def596e9 JA |
2496 | /* |
2497 | * We can't just wait for polled events to come to us, we have to actively | |
2498 | * find and complete them. | |
2499 | */ | |
c072481d | 2500 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2501 | { |
2502 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2503 | return; | |
2504 | ||
2505 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 2506 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 2507 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 2508 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 2509 | break; |
08f5439f JA |
2510 | /* |
2511 | * Ensure we allow local-to-the-cpu processing to take place, | |
2512 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2513 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2514 | */ |
3fcee5a6 PB |
2515 | if (need_resched()) { |
2516 | mutex_unlock(&ctx->uring_lock); | |
2517 | cond_resched(); | |
2518 | mutex_lock(&ctx->uring_lock); | |
2519 | } | |
def596e9 JA |
2520 | } |
2521 | mutex_unlock(&ctx->uring_lock); | |
2522 | } | |
2523 | ||
7668b92a | 2524 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2525 | { |
7668b92a | 2526 | unsigned int nr_events = 0; |
e9979b36 | 2527 | int ret = 0; |
500f9fba | 2528 | |
c7849be9 XW |
2529 | /* |
2530 | * We disallow the app entering submit/complete with polling, but we | |
2531 | * still need to lock the ring to prevent racing with polled issue | |
2532 | * that got punted to a workqueue. | |
2533 | */ | |
2534 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2535 | /* |
2536 | * Don't enter poll loop if we already have events pending. | |
2537 | * If we do, we can potentially be spinning for commands that | |
2538 | * already triggered a CQE (eg in error). | |
2539 | */ | |
5ed7a37d | 2540 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2541 | __io_cqring_overflow_flush(ctx, false); |
2542 | if (io_cqring_events(ctx)) | |
2543 | goto out; | |
def596e9 | 2544 | do { |
500f9fba JA |
2545 | /* |
2546 | * If a submit got punted to a workqueue, we can have the | |
2547 | * application entering polling for a command before it gets | |
2548 | * issued. That app will hold the uring_lock for the duration | |
2549 | * of the poll right here, so we need to take a breather every | |
2550 | * now and then to ensure that the issue has a chance to add | |
2551 | * the poll to the issued list. Otherwise we can spin here | |
2552 | * forever, while the workqueue is stuck trying to acquire the | |
2553 | * very same mutex. | |
2554 | */ | |
5eef4e87 | 2555 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2556 | u32 tail = ctx->cached_cq_tail; |
2557 | ||
500f9fba | 2558 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2559 | io_run_task_work(); |
500f9fba | 2560 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2561 | |
8f487ef2 PB |
2562 | /* some requests don't go through iopoll_list */ |
2563 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 2564 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 2565 | break; |
500f9fba | 2566 | } |
5ba3c874 PB |
2567 | ret = io_do_iopoll(ctx, !min); |
2568 | if (ret < 0) | |
2569 | break; | |
2570 | nr_events += ret; | |
2571 | ret = 0; | |
2572 | } while (nr_events < min && !need_resched()); | |
f39c8a5b | 2573 | out: |
500f9fba | 2574 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2575 | return ret; |
2576 | } | |
2577 | ||
491381ce | 2578 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2579 | { |
491381ce JA |
2580 | /* |
2581 | * Tell lockdep we inherited freeze protection from submission | |
2582 | * thread. | |
2583 | */ | |
2584 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2585 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2586 | |
1c98679d PB |
2587 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2588 | sb_end_write(sb); | |
2b188cc1 JA |
2589 | } |
2590 | } | |
2591 | ||
b63534c4 | 2592 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2593 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2594 | { |
ab454438 | 2595 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2596 | |
d886e185 | 2597 | if (!req_has_async_data(req)) |
ab454438 | 2598 | return !io_req_prep_async(req); |
cd658695 | 2599 | iov_iter_restore(&rw->iter, &rw->iter_state); |
ab454438 | 2600 | return true; |
b63534c4 | 2601 | } |
b63534c4 | 2602 | |
3e6a0d3c | 2603 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2604 | { |
355afaeb | 2605 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2606 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2607 | |
355afaeb JA |
2608 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2609 | return false; | |
3e6a0d3c JA |
2610 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2611 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2612 | return false; |
7c977a58 JA |
2613 | /* |
2614 | * If ref is dying, we might be running poll reap from the exit work. | |
2615 | * Don't attempt to reissue from that path, just let it fail with | |
2616 | * -EAGAIN. | |
2617 | */ | |
3e6a0d3c JA |
2618 | if (percpu_ref_is_dying(&ctx->refs)) |
2619 | return false; | |
ef046888 JA |
2620 | /* |
2621 | * Play it safe and assume not safe to re-import and reissue if we're | |
2622 | * not in the original thread group (or in task context). | |
2623 | */ | |
2624 | if (!same_thread_group(req->task, current) || !in_task()) | |
2625 | return false; | |
3e6a0d3c JA |
2626 | return true; |
2627 | } | |
e82ad485 | 2628 | #else |
a1ff1e3f | 2629 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2630 | { |
2631 | return false; | |
2632 | } | |
e82ad485 | 2633 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2634 | { |
b63534c4 JA |
2635 | return false; |
2636 | } | |
3e6a0d3c | 2637 | #endif |
b63534c4 | 2638 | |
8ef12efe | 2639 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2640 | { |
b65c128f PB |
2641 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2642 | kiocb_end_write(req); | |
9532b99b PB |
2643 | if (res != req->result) { |
2644 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2645 | io_rw_should_reissue(req)) { | |
2646 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2647 | return true; |
9532b99b | 2648 | } |
93d2bcd2 | 2649 | req_set_fail(req); |
8ef12efe | 2650 | req->result = res; |
9532b99b | 2651 | } |
8ef12efe JA |
2652 | return false; |
2653 | } | |
2654 | ||
f237c30a | 2655 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2656 | { |
126180b9 | 2657 | unsigned int cflags = io_put_rw_kbuf(req); |
54daa9b2 | 2658 | int res = req->result; |
126180b9 | 2659 | |
fff4e40e | 2660 | if (*locked) { |
126180b9 | 2661 | io_req_complete_state(req, res, cflags); |
fff4e40e PB |
2662 | io_req_add_compl_list(req); |
2663 | } else { | |
126180b9 | 2664 | io_req_complete_post(req, res, cflags); |
fff4e40e | 2665 | } |
8ef12efe JA |
2666 | } |
2667 | ||
2668 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2669 | unsigned int issue_flags) | |
2670 | { | |
2671 | if (__io_complete_rw_common(req, res)) | |
2672 | return; | |
63637853 | 2673 | __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); |
ba816ad6 JA |
2674 | } |
2675 | ||
2676 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2677 | { | |
9adbd45d | 2678 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2679 | |
8ef12efe JA |
2680 | if (__io_complete_rw_common(req, res)) |
2681 | return; | |
2682 | req->result = res; | |
2683 | req->io_task_work.func = io_req_task_complete; | |
2684 | io_req_task_work_add(req); | |
2b188cc1 JA |
2685 | } |
2686 | ||
def596e9 JA |
2687 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2688 | { | |
9adbd45d | 2689 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2690 | |
491381ce JA |
2691 | if (kiocb->ki_flags & IOCB_WRITE) |
2692 | kiocb_end_write(req); | |
9532b99b | 2693 | if (unlikely(res != req->result)) { |
b66ceaf3 PB |
2694 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
2695 | req->flags |= REQ_F_REISSUE; | |
2696 | return; | |
9532b99b | 2697 | } |
8c130827 | 2698 | } |
bbde017a | 2699 | |
b3fa03fd PB |
2700 | req->result = res; |
2701 | /* order with io_iopoll_complete() checking ->iopoll_completed */ | |
2702 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
2703 | } |
2704 | ||
2705 | /* | |
2706 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2707 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2708 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2709 | * accessing the kiocb cookie. |
2710 | */ | |
cb3d8972 | 2711 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2712 | { |
2713 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2714 | const bool in_async = io_wq_current_is_worker(); |
2715 | ||
2716 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2717 | if (unlikely(in_async)) | |
2718 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2719 | |
2720 | /* | |
2721 | * Track whether we have multiple files in our lists. This will impact | |
2722 | * how we do polling eventually, not spinning if we're on potentially | |
2723 | * different devices. | |
2724 | */ | |
5eef4e87 | 2725 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2726 | ctx->poll_multi_queue = false; |
2727 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
2728 | struct io_kiocb *list_req; |
2729 | ||
5eef4e87 PB |
2730 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
2731 | comp_list); | |
30da1b45 | 2732 | if (list_req->file != req->file) |
915b3dde | 2733 | ctx->poll_multi_queue = true; |
def596e9 JA |
2734 | } |
2735 | ||
2736 | /* | |
2737 | * For fast devices, IO may have already completed. If it has, add | |
2738 | * it to the front so we find it first. | |
2739 | */ | |
65a6543d | 2740 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 2741 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 2742 | else |
5eef4e87 | 2743 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 2744 | |
cb3d8972 PB |
2745 | if (unlikely(in_async)) { |
2746 | /* | |
2747 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2748 | * in sq thread task context or in io worker task context. If | |
2749 | * current task context is sq thread, we don't need to check | |
2750 | * whether should wake up sq thread. | |
2751 | */ | |
2752 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2753 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2754 | wake_up(&ctx->sq_data->wait); | |
2755 | ||
2756 | mutex_unlock(&ctx->uring_lock); | |
2757 | } | |
def596e9 JA |
2758 | } |
2759 | ||
4503b767 JA |
2760 | static bool io_bdev_nowait(struct block_device *bdev) |
2761 | { | |
9ba0d0c8 | 2762 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2763 | } |
2764 | ||
2b188cc1 JA |
2765 | /* |
2766 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2767 | * any file. For now, just ensure that anything potentially problematic is done | |
2768 | * inline. | |
2769 | */ | |
b191e2df | 2770 | static bool __io_file_supports_nowait(struct file *file, int rw) |
2b188cc1 JA |
2771 | { |
2772 | umode_t mode = file_inode(file)->i_mode; | |
2773 | ||
4503b767 | 2774 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2775 | if (IS_ENABLED(CONFIG_BLOCK) && |
2776 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2777 | return true; |
2778 | return false; | |
2779 | } | |
976517f1 | 2780 | if (S_ISSOCK(mode)) |
2b188cc1 | 2781 | return true; |
4503b767 | 2782 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2783 | if (IS_ENABLED(CONFIG_BLOCK) && |
2784 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2785 | file->f_op != &io_uring_fops) |
2786 | return true; | |
2787 | return false; | |
2788 | } | |
2b188cc1 | 2789 | |
c5b85625 JA |
2790 | /* any ->read/write should understand O_NONBLOCK */ |
2791 | if (file->f_flags & O_NONBLOCK) | |
2792 | return true; | |
2793 | ||
af197f50 JA |
2794 | if (!(file->f_mode & FMODE_NOWAIT)) |
2795 | return false; | |
2796 | ||
2797 | if (rw == READ) | |
2798 | return file->f_op->read_iter != NULL; | |
2799 | ||
2800 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2801 | } |
2802 | ||
b191e2df | 2803 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
7b29f92d | 2804 | { |
b191e2df | 2805 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
7b29f92d | 2806 | return true; |
b191e2df | 2807 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
7b29f92d JA |
2808 | return true; |
2809 | ||
b191e2df | 2810 | return __io_file_supports_nowait(req->file, rw); |
7b29f92d JA |
2811 | } |
2812 | ||
5d329e12 JA |
2813 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2814 | int rw) | |
2b188cc1 | 2815 | { |
def596e9 | 2816 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2817 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2818 | struct file *file = req->file; |
09bb8394 JA |
2819 | unsigned ioprio; |
2820 | int ret; | |
2b188cc1 | 2821 | |
c97d8a0f | 2822 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2823 | req->flags |= REQ_F_ISREG; |
2824 | ||
2b188cc1 | 2825 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2826 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2827 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2828 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2829 | } |
2b188cc1 | 2830 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2831 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2832 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2833 | if (unlikely(ret)) | |
2834 | return ret; | |
2b188cc1 | 2835 | |
5d329e12 JA |
2836 | /* |
2837 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
2838 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
2839 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
2840 | */ | |
2841 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
2842 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req, rw))) | |
75c668cd PB |
2843 | req->flags |= REQ_F_NOWAIT; |
2844 | ||
2b188cc1 JA |
2845 | ioprio = READ_ONCE(sqe->ioprio); |
2846 | if (ioprio) { | |
2847 | ret = ioprio_check_cap(ioprio); | |
2848 | if (ret) | |
09bb8394 | 2849 | return ret; |
2b188cc1 JA |
2850 | |
2851 | kiocb->ki_ioprio = ioprio; | |
2852 | } else | |
2853 | kiocb->ki_ioprio = get_current_ioprio(); | |
2854 | ||
def596e9 | 2855 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2856 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2857 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2858 | return -EOPNOTSUPP; |
2b188cc1 | 2859 | |
394918eb | 2860 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
def596e9 | 2861 | kiocb->ki_complete = io_complete_rw_iopoll; |
65a6543d | 2862 | req->iopoll_completed = 0; |
def596e9 | 2863 | } else { |
09bb8394 JA |
2864 | if (kiocb->ki_flags & IOCB_HIPRI) |
2865 | return -EINVAL; | |
def596e9 JA |
2866 | kiocb->ki_complete = io_complete_rw; |
2867 | } | |
9adbd45d | 2868 | |
eae071c9 PB |
2869 | if (req->opcode == IORING_OP_READ_FIXED || |
2870 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2871 | req->imu = NULL; | |
a46be971 | 2872 | io_req_set_rsrc_node(req, ctx); |
eae071c9 PB |
2873 | } |
2874 | ||
3529d8c2 JA |
2875 | req->rw.addr = READ_ONCE(sqe->addr); |
2876 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2877 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2878 | return 0; |
2b188cc1 JA |
2879 | } |
2880 | ||
2881 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2882 | { | |
2883 | switch (ret) { | |
2884 | case -EIOCBQUEUED: | |
2885 | break; | |
2886 | case -ERESTARTSYS: | |
2887 | case -ERESTARTNOINTR: | |
2888 | case -ERESTARTNOHAND: | |
2889 | case -ERESTART_RESTARTBLOCK: | |
2890 | /* | |
2891 | * We can't just restart the syscall, since previously | |
2892 | * submitted sqes may already be in progress. Just fail this | |
2893 | * IO with EINTR. | |
2894 | */ | |
2895 | ret = -EINTR; | |
df561f66 | 2896 | fallthrough; |
2b188cc1 JA |
2897 | default: |
2898 | kiocb->ki_complete(kiocb, ret, 0); | |
2899 | } | |
2900 | } | |
2901 | ||
a1d7c393 | 2902 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2903 | unsigned int issue_flags) |
ba816ad6 | 2904 | { |
ba04291e | 2905 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2906 | struct io_async_rw *io = req->async_data; |
ba04291e | 2907 | |
227c0c96 | 2908 | /* add previously done IO, if any */ |
d886e185 | 2909 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 2910 | if (ret < 0) |
e8c2bc1f | 2911 | ret = io->bytes_done; |
227c0c96 | 2912 | else |
e8c2bc1f | 2913 | ret += io->bytes_done; |
227c0c96 JA |
2914 | } |
2915 | ||
ba04291e JA |
2916 | if (req->flags & REQ_F_CUR_POS) |
2917 | req->file->f_pos = kiocb->ki_pos; | |
b66ceaf3 | 2918 | if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) |
889fca73 | 2919 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2920 | else |
2921 | io_rw_done(kiocb, ret); | |
97284637 | 2922 | |
b66ceaf3 | 2923 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 2924 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2925 | if (io_resubmit_prep(req)) { |
773af691 | 2926 | io_req_task_queue_reissue(req); |
8c130827 | 2927 | } else { |
b66ceaf3 PB |
2928 | unsigned int cflags = io_put_rw_kbuf(req); |
2929 | struct io_ring_ctx *ctx = req->ctx; | |
2930 | ||
93d2bcd2 | 2931 | req_set_fail(req); |
14cfbb7a | 2932 | if (!(issue_flags & IO_URING_F_NONBLOCK)) { |
b66ceaf3 PB |
2933 | mutex_lock(&ctx->uring_lock); |
2934 | __io_req_complete(req, issue_flags, ret, cflags); | |
2935 | mutex_unlock(&ctx->uring_lock); | |
2936 | } else { | |
2937 | __io_req_complete(req, issue_flags, ret, cflags); | |
2938 | } | |
97284637 PB |
2939 | } |
2940 | } | |
ba816ad6 JA |
2941 | } |
2942 | ||
eae071c9 PB |
2943 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2944 | struct io_mapped_ubuf *imu) | |
edafccee | 2945 | { |
9adbd45d | 2946 | size_t len = req->rw.len; |
75769e3f | 2947 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2948 | size_t offset; |
edafccee | 2949 | |
75769e3f | 2950 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2951 | return -EFAULT; |
2952 | /* not inside the mapped region */ | |
4751f53d | 2953 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2954 | return -EFAULT; |
2955 | ||
2956 | /* | |
2957 | * May not be a start of buffer, set size appropriately | |
2958 | * and advance us to the beginning. | |
2959 | */ | |
2960 | offset = buf_addr - imu->ubuf; | |
2961 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2962 | |
2963 | if (offset) { | |
2964 | /* | |
2965 | * Don't use iov_iter_advance() here, as it's really slow for | |
2966 | * using the latter parts of a big fixed buffer - it iterates | |
2967 | * over each segment manually. We can cheat a bit here, because | |
2968 | * we know that: | |
2969 | * | |
2970 | * 1) it's a BVEC iter, we set it up | |
2971 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2972 | * first and last bvec | |
2973 | * | |
2974 | * So just find our index, and adjust the iterator afterwards. | |
2975 | * If the offset is within the first bvec (or the whole first | |
2976 | * bvec, just use iov_iter_advance(). This makes it easier | |
2977 | * since we can just skip the first segment, which may not | |
2978 | * be PAGE_SIZE aligned. | |
2979 | */ | |
2980 | const struct bio_vec *bvec = imu->bvec; | |
2981 | ||
2982 | if (offset <= bvec->bv_len) { | |
2983 | iov_iter_advance(iter, offset); | |
2984 | } else { | |
2985 | unsigned long seg_skip; | |
2986 | ||
2987 | /* skip first vec */ | |
2988 | offset -= bvec->bv_len; | |
2989 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2990 | ||
2991 | iter->bvec = bvec + seg_skip; | |
2992 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2993 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2994 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2995 | } |
2996 | } | |
2997 | ||
847595de | 2998 | return 0; |
edafccee JA |
2999 | } |
3000 | ||
eae071c9 PB |
3001 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
3002 | { | |
3003 | struct io_ring_ctx *ctx = req->ctx; | |
3004 | struct io_mapped_ubuf *imu = req->imu; | |
3005 | u16 index, buf_index = req->buf_index; | |
3006 | ||
3007 | if (likely(!imu)) { | |
3008 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
3009 | return -EFAULT; | |
3010 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
3011 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3012 | req->imu = imu; | |
3013 | } | |
3014 | return __io_import_fixed(req, rw, iter, imu); | |
3015 | } | |
3016 | ||
bcda7baa JA |
3017 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3018 | { | |
3019 | if (needs_lock) | |
3020 | mutex_unlock(&ctx->uring_lock); | |
3021 | } | |
3022 | ||
3023 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3024 | { | |
3025 | /* | |
3026 | * "Normal" inline submissions always hold the uring_lock, since we | |
3027 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3028 | * The only exception is when we've detached the request and issue it | |
3029 | * from an async worker thread, grab the lock for that case. | |
3030 | */ | |
3031 | if (needs_lock) | |
3032 | mutex_lock(&ctx->uring_lock); | |
3033 | } | |
3034 | ||
3035 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
30d51dd4 | 3036 | int bgid, bool needs_lock) |
bcda7baa | 3037 | { |
30d51dd4 | 3038 | struct io_buffer *kbuf = req->kbuf; |
bcda7baa JA |
3039 | struct io_buffer *head; |
3040 | ||
3041 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3042 | return kbuf; | |
3043 | ||
3044 | io_ring_submit_lock(req->ctx, needs_lock); | |
3045 | ||
3046 | lockdep_assert_held(&req->ctx->uring_lock); | |
3047 | ||
9e15c3a0 | 3048 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3049 | if (head) { |
3050 | if (!list_empty(&head->list)) { | |
3051 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3052 | list); | |
3053 | list_del(&kbuf->list); | |
3054 | } else { | |
3055 | kbuf = head; | |
9e15c3a0 | 3056 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3057 | } |
3058 | if (*len > kbuf->len) | |
3059 | *len = kbuf->len; | |
30d51dd4 PB |
3060 | req->flags |= REQ_F_BUFFER_SELECTED; |
3061 | req->kbuf = kbuf; | |
bcda7baa JA |
3062 | } else { |
3063 | kbuf = ERR_PTR(-ENOBUFS); | |
3064 | } | |
3065 | ||
3066 | io_ring_submit_unlock(req->ctx, needs_lock); | |
bcda7baa JA |
3067 | return kbuf; |
3068 | } | |
3069 | ||
4d954c25 JA |
3070 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3071 | bool needs_lock) | |
3072 | { | |
3073 | struct io_buffer *kbuf; | |
4f4eeba8 | 3074 | u16 bgid; |
4d954c25 | 3075 | |
4f4eeba8 | 3076 | bgid = req->buf_index; |
30d51dd4 | 3077 | kbuf = io_buffer_select(req, len, bgid, needs_lock); |
4d954c25 JA |
3078 | if (IS_ERR(kbuf)) |
3079 | return kbuf; | |
4d954c25 JA |
3080 | return u64_to_user_ptr(kbuf->addr); |
3081 | } | |
3082 | ||
3083 | #ifdef CONFIG_COMPAT | |
3084 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3085 | bool needs_lock) | |
3086 | { | |
3087 | struct compat_iovec __user *uiov; | |
3088 | compat_ssize_t clen; | |
3089 | void __user *buf; | |
3090 | ssize_t len; | |
3091 | ||
3092 | uiov = u64_to_user_ptr(req->rw.addr); | |
3093 | if (!access_ok(uiov, sizeof(*uiov))) | |
3094 | return -EFAULT; | |
3095 | if (__get_user(clen, &uiov->iov_len)) | |
3096 | return -EFAULT; | |
3097 | if (clen < 0) | |
3098 | return -EINVAL; | |
3099 | ||
3100 | len = clen; | |
3101 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3102 | if (IS_ERR(buf)) | |
3103 | return PTR_ERR(buf); | |
3104 | iov[0].iov_base = buf; | |
3105 | iov[0].iov_len = (compat_size_t) len; | |
3106 | return 0; | |
3107 | } | |
3108 | #endif | |
3109 | ||
3110 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3111 | bool needs_lock) | |
3112 | { | |
3113 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3114 | void __user *buf; | |
3115 | ssize_t len; | |
3116 | ||
3117 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3118 | return -EFAULT; | |
3119 | ||
3120 | len = iov[0].iov_len; | |
3121 | if (len < 0) | |
3122 | return -EINVAL; | |
3123 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3124 | if (IS_ERR(buf)) | |
3125 | return PTR_ERR(buf); | |
3126 | iov[0].iov_base = buf; | |
3127 | iov[0].iov_len = len; | |
3128 | return 0; | |
3129 | } | |
3130 | ||
3131 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3132 | bool needs_lock) | |
3133 | { | |
dddb3e26 | 3134 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 | 3135 | struct io_buffer *kbuf = req->kbuf; |
dddb3e26 | 3136 | |
dddb3e26 JA |
3137 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
3138 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3139 | return 0; |
dddb3e26 | 3140 | } |
dd201662 | 3141 | if (req->rw.len != 1) |
4d954c25 JA |
3142 | return -EINVAL; |
3143 | ||
3144 | #ifdef CONFIG_COMPAT | |
3145 | if (req->ctx->compat) | |
3146 | return io_compat_import(req, iov, needs_lock); | |
3147 | #endif | |
3148 | ||
3149 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3150 | } | |
3151 | ||
847595de PB |
3152 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3153 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3154 | { |
9adbd45d JA |
3155 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3156 | size_t sqe_len = req->rw.len; | |
847595de | 3157 | u8 opcode = req->opcode; |
4d954c25 | 3158 | ssize_t ret; |
edafccee | 3159 | |
7d009165 | 3160 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3161 | *iovec = NULL; |
9adbd45d | 3162 | return io_import_fixed(req, rw, iter); |
edafccee | 3163 | } |
2b188cc1 | 3164 | |
bcda7baa | 3165 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3166 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3167 | return -EINVAL; |
3168 | ||
3a6820f2 | 3169 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3170 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3171 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3172 | if (IS_ERR(buf)) |
4d954c25 | 3173 | return PTR_ERR(buf); |
3f9d6441 | 3174 | req->rw.len = sqe_len; |
bcda7baa JA |
3175 | } |
3176 | ||
3a6820f2 JA |
3177 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3178 | *iovec = NULL; | |
10fc72e4 | 3179 | return ret; |
3a6820f2 JA |
3180 | } |
3181 | ||
4d954c25 JA |
3182 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3183 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3184 | if (!ret) |
3185 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3186 | *iovec = NULL; |
3187 | return ret; | |
3188 | } | |
3189 | ||
89cd35c5 CH |
3190 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3191 | req->ctx->compat); | |
2b188cc1 JA |
3192 | } |
3193 | ||
0fef9483 JA |
3194 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3195 | { | |
5b09e37e | 3196 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3197 | } |
3198 | ||
31b51510 | 3199 | /* |
32960613 JA |
3200 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3201 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3202 | */ |
4017eb91 | 3203 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3204 | { |
4017eb91 JA |
3205 | struct kiocb *kiocb = &req->rw.kiocb; |
3206 | struct file *file = req->file; | |
32960613 JA |
3207 | ssize_t ret = 0; |
3208 | ||
3209 | /* | |
3210 | * Don't support polled IO through this interface, and we can't | |
3211 | * support non-blocking either. For the latter, this just causes | |
3212 | * the kiocb to be handled from an async context. | |
3213 | */ | |
3214 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3215 | return -EOPNOTSUPP; | |
3216 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3217 | return -EAGAIN; | |
3218 | ||
3219 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3220 | struct iovec iovec; |
32960613 JA |
3221 | ssize_t nr; |
3222 | ||
311ae9e1 PB |
3223 | if (!iov_iter_is_bvec(iter)) { |
3224 | iovec = iov_iter_iovec(iter); | |
3225 | } else { | |
4017eb91 JA |
3226 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3227 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3228 | } |
3229 | ||
32960613 JA |
3230 | if (rw == READ) { |
3231 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3232 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3233 | } else { |
3234 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3235 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3236 | } |
3237 | ||
3238 | if (nr < 0) { | |
3239 | if (!ret) | |
3240 | ret = nr; | |
3241 | break; | |
3242 | } | |
16c8d2df JA |
3243 | if (!iov_iter_is_bvec(iter)) { |
3244 | iov_iter_advance(iter, nr); | |
3245 | } else { | |
3246 | req->rw.len -= nr; | |
3247 | req->rw.addr += nr; | |
3248 | } | |
32960613 JA |
3249 | ret += nr; |
3250 | if (nr != iovec.iov_len) | |
3251 | break; | |
32960613 JA |
3252 | } |
3253 | ||
3254 | return ret; | |
3255 | } | |
3256 | ||
ff6165b2 JA |
3257 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3258 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3259 | { |
e8c2bc1f | 3260 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3261 | |
ff6165b2 | 3262 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3263 | rw->free_iovec = iovec; |
227c0c96 | 3264 | rw->bytes_done = 0; |
ff6165b2 | 3265 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3266 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3267 | return; |
b64e3444 | 3268 | if (!iovec) { |
ff6165b2 JA |
3269 | unsigned iov_off = 0; |
3270 | ||
3271 | rw->iter.iov = rw->fast_iov; | |
3272 | if (iter->iov != fast_iov) { | |
3273 | iov_off = iter->iov - fast_iov; | |
3274 | rw->iter.iov += iov_off; | |
3275 | } | |
3276 | if (rw->fast_iov != fast_iov) | |
3277 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3278 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3279 | } else { |
3280 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3281 | } |
3282 | } | |
3283 | ||
8d4af685 | 3284 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3285 | { |
e8c2bc1f JA |
3286 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3287 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
3288 | if (req->async_data) { |
3289 | req->flags |= REQ_F_ASYNC_DATA; | |
3290 | return false; | |
3291 | } | |
3292 | return true; | |
3d9932a8 XW |
3293 | } |
3294 | ||
ff6165b2 JA |
3295 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3296 | const struct iovec *fast_iov, | |
227c0c96 | 3297 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3298 | { |
26f0505a | 3299 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3300 | return 0; |
d886e185 | 3301 | if (!req_has_async_data(req)) { |
cd658695 JA |
3302 | struct io_async_rw *iorw; |
3303 | ||
6cb78689 | 3304 | if (io_alloc_async_data(req)) { |
6bf985dc | 3305 | kfree(iovec); |
5d204bcf | 3306 | return -ENOMEM; |
6bf985dc | 3307 | } |
b7bb4f7d | 3308 | |
ff6165b2 | 3309 | io_req_map_rw(req, iovec, fast_iov, iter); |
cd658695 JA |
3310 | iorw = req->async_data; |
3311 | /* we've copied and mapped the iter, ensure state is saved */ | |
3312 | iov_iter_save_state(&iorw->iter, &iorw->iter_state); | |
5d204bcf | 3313 | } |
b7bb4f7d | 3314 | return 0; |
f67676d1 JA |
3315 | } |
3316 | ||
73debe68 | 3317 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3318 | { |
e8c2bc1f | 3319 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3320 | struct iovec *iov = iorw->fast_iov; |
847595de | 3321 | int ret; |
c3e330a4 | 3322 | |
2846c481 | 3323 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3324 | if (unlikely(ret < 0)) |
3325 | return ret; | |
3326 | ||
ab0b196c PB |
3327 | iorw->bytes_done = 0; |
3328 | iorw->free_iovec = iov; | |
3329 | if (iov) | |
3330 | req->flags |= REQ_F_NEED_CLEANUP; | |
cd658695 | 3331 | iov_iter_save_state(&iorw->iter, &iorw->iter_state); |
c3e330a4 PB |
3332 | return 0; |
3333 | } | |
3334 | ||
73debe68 | 3335 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3336 | { |
3529d8c2 JA |
3337 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3338 | return -EBADF; | |
5d329e12 | 3339 | return io_prep_rw(req, sqe, READ); |
f67676d1 JA |
3340 | } |
3341 | ||
c1dd91d1 JA |
3342 | /* |
3343 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3344 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3345 | * This gets called when the page is unlocked, and we generally expect that to | |
3346 | * happen when the page IO is completed and the page is now uptodate. This will | |
3347 | * queue a task_work based retry of the operation, attempting to copy the data | |
3348 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3349 | * do a thread based blocking retry of the operation. That's the unexpected | |
3350 | * slow path. | |
3351 | */ | |
bcf5a063 JA |
3352 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3353 | int sync, void *arg) | |
3354 | { | |
3355 | struct wait_page_queue *wpq; | |
3356 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3357 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3358 | |
3359 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3360 | ||
cdc8fcb4 LT |
3361 | if (!wake_page_match(wpq, key)) |
3362 | return 0; | |
3363 | ||
c8d317aa | 3364 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3365 | list_del_init(&wait->entry); |
921b9054 | 3366 | io_req_task_queue(req); |
bcf5a063 JA |
3367 | return 1; |
3368 | } | |
3369 | ||
c1dd91d1 JA |
3370 | /* |
3371 | * This controls whether a given IO request should be armed for async page | |
3372 | * based retry. If we return false here, the request is handed to the async | |
3373 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3374 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3375 | * will either succeed because the page is now uptodate and unlocked, or it | |
3376 | * will register a callback when the page is unlocked at IO completion. Through | |
3377 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3378 | * That retry will attempt the buffered read again. The retry will generally | |
3379 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3380 | * async worker threads for a blocking retry. | |
3381 | */ | |
227c0c96 | 3382 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3383 | { |
e8c2bc1f JA |
3384 | struct io_async_rw *rw = req->async_data; |
3385 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3386 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3387 | |
bcf5a063 JA |
3388 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3389 | if (req->flags & REQ_F_NOWAIT) | |
3390 | return false; | |
f67676d1 | 3391 | |
227c0c96 | 3392 | /* Only for buffered IO */ |
3b2a4439 | 3393 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3394 | return false; |
3b2a4439 | 3395 | |
bcf5a063 JA |
3396 | /* |
3397 | * just use poll if we can, and don't attempt if the fs doesn't | |
3398 | * support callback based unlocks | |
3399 | */ | |
3400 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3401 | return false; | |
f67676d1 | 3402 | |
3b2a4439 JA |
3403 | wait->wait.func = io_async_buf_func; |
3404 | wait->wait.private = req; | |
3405 | wait->wait.flags = 0; | |
3406 | INIT_LIST_HEAD(&wait->wait.entry); | |
3407 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3408 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3409 | kiocb->ki_waitq = wait; |
3b2a4439 | 3410 | return true; |
bcf5a063 JA |
3411 | } |
3412 | ||
aeab9506 | 3413 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3414 | { |
3415 | if (req->file->f_op->read_iter) | |
3416 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3417 | else if (req->file->f_op->read) |
4017eb91 | 3418 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3419 | else |
3420 | return -EINVAL; | |
f67676d1 JA |
3421 | } |
3422 | ||
7db30437 ML |
3423 | static bool need_read_all(struct io_kiocb *req) |
3424 | { | |
3425 | return req->flags & REQ_F_ISREG || | |
3426 | S_ISBLK(file_inode(req->file)->i_mode); | |
3427 | } | |
3428 | ||
889fca73 | 3429 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3430 | { |
3431 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3432 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3433 | struct iov_iter __iter, *iter = &__iter; |
45d189c6 | 3434 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3435 | struct iov_iter_state __state, *state; |
d886e185 | 3436 | struct io_async_rw *rw; |
cd658695 | 3437 | ssize_t ret, ret2; |
ff6165b2 | 3438 | |
d886e185 PB |
3439 | if (req_has_async_data(req)) { |
3440 | rw = req->async_data; | |
e8c2bc1f | 3441 | iter = &rw->iter; |
cd658695 JA |
3442 | state = &rw->iter_state; |
3443 | /* | |
3444 | * We come here from an earlier attempt, restore our state to | |
3445 | * match in case it doesn't. It's cheap enough that we don't | |
3446 | * need to make this conditional. | |
3447 | */ | |
3448 | iov_iter_restore(iter, state); | |
2846c481 PB |
3449 | iovec = NULL; |
3450 | } else { | |
3451 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3452 | if (ret < 0) | |
3453 | return ret; | |
cd658695 JA |
3454 | state = &__state; |
3455 | iov_iter_save_state(iter, state); | |
2846c481 | 3456 | } |
cd658695 | 3457 | req->result = iov_iter_count(iter); |
2b188cc1 | 3458 | |
fd6c2e4c JA |
3459 | /* Ensure we clear previously set non-block flag */ |
3460 | if (!force_nonblock) | |
29de5f6a | 3461 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3462 | else |
3463 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3464 | ||
24c74678 | 3465 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3466 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
6713e7a6 | 3467 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3468 | return ret ?: -EAGAIN; |
6713e7a6 | 3469 | } |
9e645e11 | 3470 | |
cd658695 | 3471 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); |
5ea5dd45 PB |
3472 | if (unlikely(ret)) { |
3473 | kfree(iovec); | |
3474 | return ret; | |
3475 | } | |
2b188cc1 | 3476 | |
227c0c96 | 3477 | ret = io_iter_do_read(req, iter); |
32960613 | 3478 | |
230d50d4 | 3479 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3480 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3481 | /* IOPOLL retry should happen for io-wq threads */ |
3482 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3483 | goto done; |
75c668cd PB |
3484 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3485 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3486 | goto done; |
f38c7e3a | 3487 | ret = 0; |
230d50d4 JA |
3488 | } else if (ret == -EIOCBQUEUED) { |
3489 | goto out_free; | |
cd658695 | 3490 | } else if (ret <= 0 || ret == req->result || !force_nonblock || |
7db30437 | 3491 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3492 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3493 | goto done; |
227c0c96 JA |
3494 | } |
3495 | ||
cd658695 JA |
3496 | /* |
3497 | * Don't depend on the iter state matching what was consumed, or being | |
3498 | * untouched in case of error. Restore it and we'll advance it | |
3499 | * manually if we need to. | |
3500 | */ | |
3501 | iov_iter_restore(iter, state); | |
3502 | ||
227c0c96 | 3503 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3504 | if (ret2) |
3505 | return ret2; | |
3506 | ||
fe1cdd55 | 3507 | iovec = NULL; |
e8c2bc1f | 3508 | rw = req->async_data; |
cd658695 JA |
3509 | /* |
3510 | * Now use our persistent iterator and state, if we aren't already. | |
3511 | * We've restored and mapped the iter to match. | |
3512 | */ | |
3513 | if (iter != &rw->iter) { | |
3514 | iter = &rw->iter; | |
3515 | state = &rw->iter_state; | |
3516 | } | |
227c0c96 | 3517 | |
b23df91b | 3518 | do { |
cd658695 JA |
3519 | /* |
3520 | * We end up here because of a partial read, either from | |
3521 | * above or inside this loop. Advance the iter by the bytes | |
3522 | * that were consumed. | |
3523 | */ | |
3524 | iov_iter_advance(iter, ret); | |
3525 | if (!iov_iter_count(iter)) | |
3526 | break; | |
b23df91b | 3527 | rw->bytes_done += ret; |
cd658695 JA |
3528 | iov_iter_save_state(iter, state); |
3529 | ||
b23df91b PB |
3530 | /* if we can retry, do so with the callbacks armed */ |
3531 | if (!io_rw_should_retry(req)) { | |
3532 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3533 | return -EAGAIN; | |
3534 | } | |
3535 | ||
3536 | /* | |
3537 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3538 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3539 | * desired page gets unlocked. We can also get a partial read | |
3540 | * here, and if we do, then just retry at the new offset. | |
3541 | */ | |
3542 | ret = io_iter_do_read(req, iter); | |
3543 | if (ret == -EIOCBQUEUED) | |
3544 | return 0; | |
227c0c96 | 3545 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3546 | kiocb->ki_flags &= ~IOCB_WAITQ; |
cd658695 JA |
3547 | iov_iter_restore(iter, state); |
3548 | } while (ret > 0); | |
227c0c96 | 3549 | done: |
889fca73 | 3550 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3551 | out_free: |
3552 | /* it's faster to check here then delegate to kfree */ | |
3553 | if (iovec) | |
3554 | kfree(iovec); | |
5ea5dd45 | 3555 | return 0; |
2b188cc1 JA |
3556 | } |
3557 | ||
73debe68 | 3558 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3559 | { |
3529d8c2 JA |
3560 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3561 | return -EBADF; | |
5d329e12 | 3562 | return io_prep_rw(req, sqe, WRITE); |
f67676d1 JA |
3563 | } |
3564 | ||
889fca73 | 3565 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3566 | { |
3567 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3568 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3569 | struct iov_iter __iter, *iter = &__iter; |
45d189c6 | 3570 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3571 | struct iov_iter_state __state, *state; |
d886e185 | 3572 | struct io_async_rw *rw; |
cd658695 | 3573 | ssize_t ret, ret2; |
2b188cc1 | 3574 | |
d886e185 PB |
3575 | if (req_has_async_data(req)) { |
3576 | rw = req->async_data; | |
e8c2bc1f | 3577 | iter = &rw->iter; |
cd658695 JA |
3578 | state = &rw->iter_state; |
3579 | iov_iter_restore(iter, state); | |
2846c481 PB |
3580 | iovec = NULL; |
3581 | } else { | |
3582 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3583 | if (ret < 0) | |
3584 | return ret; | |
cd658695 JA |
3585 | state = &__state; |
3586 | iov_iter_save_state(iter, state); | |
2846c481 | 3587 | } |
cd658695 | 3588 | req->result = iov_iter_count(iter); |
2b188cc1 | 3589 | |
fd6c2e4c JA |
3590 | /* Ensure we clear previously set non-block flag */ |
3591 | if (!force_nonblock) | |
a88fc400 PB |
3592 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3593 | else | |
3594 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3595 | |
24c74678 | 3596 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3597 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
f67676d1 | 3598 | goto copy_iov; |
31b51510 | 3599 | |
10d59345 JA |
3600 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3601 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3602 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3603 | goto copy_iov; |
31b51510 | 3604 | |
cd658695 | 3605 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); |
fa15bafb PB |
3606 | if (unlikely(ret)) |
3607 | goto out_free; | |
4ed734b0 | 3608 | |
fa15bafb PB |
3609 | /* |
3610 | * Open-code file_start_write here to grab freeze protection, | |
3611 | * which will be released by another thread in | |
3612 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3613 | * released so that it doesn't complain about the held lock when | |
3614 | * we return to userspace. | |
3615 | */ | |
3616 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3617 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3618 | __sb_writers_release(file_inode(req->file)->i_sb, |
3619 | SB_FREEZE_WRITE); | |
3620 | } | |
3621 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3622 | |
fa15bafb | 3623 | if (req->file->f_op->write_iter) |
ff6165b2 | 3624 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3625 | else if (req->file->f_op->write) |
4017eb91 | 3626 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3627 | else |
3628 | ret2 = -EINVAL; | |
4ed734b0 | 3629 | |
6ad7f233 PB |
3630 | if (req->flags & REQ_F_REISSUE) { |
3631 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3632 | ret2 = -EAGAIN; |
6ad7f233 | 3633 | } |
230d50d4 | 3634 | |
fa15bafb PB |
3635 | /* |
3636 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3637 | * retry them without IOCB_NOWAIT. | |
3638 | */ | |
3639 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3640 | ret2 = -EAGAIN; | |
75c668cd PB |
3641 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3642 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3643 | goto done; |
fa15bafb | 3644 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3645 | /* IOPOLL retry should happen for io-wq threads */ |
3646 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3647 | goto copy_iov; | |
355afaeb | 3648 | done: |
889fca73 | 3649 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3650 | } else { |
f67676d1 | 3651 | copy_iov: |
cd658695 | 3652 | iov_iter_restore(iter, state); |
227c0c96 | 3653 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3654 | return ret ?: -EAGAIN; |
2b188cc1 | 3655 | } |
31b51510 | 3656 | out_free: |
f261c168 | 3657 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3658 | if (iovec) |
6f2cc166 | 3659 | kfree(iovec); |
2b188cc1 JA |
3660 | return ret; |
3661 | } | |
3662 | ||
80a261fd JA |
3663 | static int io_renameat_prep(struct io_kiocb *req, |
3664 | const struct io_uring_sqe *sqe) | |
3665 | { | |
3666 | struct io_rename *ren = &req->rename; | |
3667 | const char __user *oldf, *newf; | |
3668 | ||
ed7eb259 JA |
3669 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3670 | return -EINVAL; | |
26578cda | 3671 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3672 | return -EINVAL; |
80a261fd JA |
3673 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3674 | return -EBADF; | |
3675 | ||
3676 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3677 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3678 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3679 | ren->new_dfd = READ_ONCE(sqe->len); | |
3680 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3681 | ||
3682 | ren->oldpath = getname(oldf); | |
3683 | if (IS_ERR(ren->oldpath)) | |
3684 | return PTR_ERR(ren->oldpath); | |
3685 | ||
3686 | ren->newpath = getname(newf); | |
3687 | if (IS_ERR(ren->newpath)) { | |
3688 | putname(ren->oldpath); | |
3689 | return PTR_ERR(ren->newpath); | |
3690 | } | |
3691 | ||
3692 | req->flags |= REQ_F_NEED_CLEANUP; | |
3693 | return 0; | |
3694 | } | |
3695 | ||
45d189c6 | 3696 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3697 | { |
3698 | struct io_rename *ren = &req->rename; | |
3699 | int ret; | |
3700 | ||
45d189c6 | 3701 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3702 | return -EAGAIN; |
3703 | ||
3704 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3705 | ren->newpath, ren->flags); | |
3706 | ||
3707 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3708 | if (ret < 0) | |
93d2bcd2 | 3709 | req_set_fail(req); |
80a261fd JA |
3710 | io_req_complete(req, ret); |
3711 | return 0; | |
3712 | } | |
3713 | ||
14a1143b JA |
3714 | static int io_unlinkat_prep(struct io_kiocb *req, |
3715 | const struct io_uring_sqe *sqe) | |
3716 | { | |
3717 | struct io_unlink *un = &req->unlink; | |
3718 | const char __user *fname; | |
3719 | ||
22634bc5 JA |
3720 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3721 | return -EINVAL; | |
26578cda PB |
3722 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3723 | sqe->splice_fd_in) | |
22634bc5 | 3724 | return -EINVAL; |
14a1143b JA |
3725 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3726 | return -EBADF; | |
3727 | ||
3728 | un->dfd = READ_ONCE(sqe->fd); | |
3729 | ||
3730 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3731 | if (un->flags & ~AT_REMOVEDIR) | |
3732 | return -EINVAL; | |
3733 | ||
3734 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3735 | un->filename = getname(fname); | |
3736 | if (IS_ERR(un->filename)) | |
3737 | return PTR_ERR(un->filename); | |
3738 | ||
3739 | req->flags |= REQ_F_NEED_CLEANUP; | |
3740 | return 0; | |
3741 | } | |
3742 | ||
45d189c6 | 3743 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3744 | { |
3745 | struct io_unlink *un = &req->unlink; | |
3746 | int ret; | |
3747 | ||
45d189c6 | 3748 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3749 | return -EAGAIN; |
3750 | ||
3751 | if (un->flags & AT_REMOVEDIR) | |
3752 | ret = do_rmdir(un->dfd, un->filename); | |
3753 | else | |
3754 | ret = do_unlinkat(un->dfd, un->filename); | |
3755 | ||
3756 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3757 | if (ret < 0) | |
93d2bcd2 | 3758 | req_set_fail(req); |
14a1143b JA |
3759 | io_req_complete(req, ret); |
3760 | return 0; | |
3761 | } | |
3762 | ||
e34a02dc DK |
3763 | static int io_mkdirat_prep(struct io_kiocb *req, |
3764 | const struct io_uring_sqe *sqe) | |
3765 | { | |
3766 | struct io_mkdir *mkd = &req->mkdir; | |
3767 | const char __user *fname; | |
3768 | ||
3769 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3770 | return -EINVAL; | |
3771 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
3772 | sqe->splice_fd_in) | |
3773 | return -EINVAL; | |
3774 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3775 | return -EBADF; | |
3776 | ||
3777 | mkd->dfd = READ_ONCE(sqe->fd); | |
3778 | mkd->mode = READ_ONCE(sqe->len); | |
3779 | ||
3780 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3781 | mkd->filename = getname(fname); | |
3782 | if (IS_ERR(mkd->filename)) | |
3783 | return PTR_ERR(mkd->filename); | |
3784 | ||
3785 | req->flags |= REQ_F_NEED_CLEANUP; | |
3786 | return 0; | |
3787 | } | |
3788 | ||
04f34081 | 3789 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
3790 | { |
3791 | struct io_mkdir *mkd = &req->mkdir; | |
3792 | int ret; | |
3793 | ||
3794 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3795 | return -EAGAIN; | |
3796 | ||
3797 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
3798 | ||
3799 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3800 | if (ret < 0) | |
3801 | req_set_fail(req); | |
3802 | io_req_complete(req, ret); | |
3803 | return 0; | |
3804 | } | |
3805 | ||
7a8721f8 DK |
3806 | static int io_symlinkat_prep(struct io_kiocb *req, |
3807 | const struct io_uring_sqe *sqe) | |
3808 | { | |
3809 | struct io_symlink *sl = &req->symlink; | |
3810 | const char __user *oldpath, *newpath; | |
3811 | ||
3812 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3813 | return -EINVAL; | |
3814 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
3815 | sqe->splice_fd_in) | |
3816 | return -EINVAL; | |
3817 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3818 | return -EBADF; | |
3819 | ||
3820 | sl->new_dfd = READ_ONCE(sqe->fd); | |
3821 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3822 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3823 | ||
3824 | sl->oldpath = getname(oldpath); | |
3825 | if (IS_ERR(sl->oldpath)) | |
3826 | return PTR_ERR(sl->oldpath); | |
3827 | ||
3828 | sl->newpath = getname(newpath); | |
3829 | if (IS_ERR(sl->newpath)) { | |
3830 | putname(sl->oldpath); | |
3831 | return PTR_ERR(sl->newpath); | |
3832 | } | |
3833 | ||
3834 | req->flags |= REQ_F_NEED_CLEANUP; | |
3835 | return 0; | |
3836 | } | |
3837 | ||
04f34081 | 3838 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
3839 | { |
3840 | struct io_symlink *sl = &req->symlink; | |
3841 | int ret; | |
3842 | ||
3843 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3844 | return -EAGAIN; | |
3845 | ||
3846 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
3847 | ||
3848 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3849 | if (ret < 0) | |
3850 | req_set_fail(req); | |
3851 | io_req_complete(req, ret); | |
3852 | return 0; | |
3853 | } | |
3854 | ||
cf30da90 DK |
3855 | static int io_linkat_prep(struct io_kiocb *req, |
3856 | const struct io_uring_sqe *sqe) | |
3857 | { | |
3858 | struct io_hardlink *lnk = &req->hardlink; | |
3859 | const char __user *oldf, *newf; | |
3860 | ||
3861 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3862 | return -EINVAL; | |
3863 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
3864 | return -EINVAL; | |
3865 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3866 | return -EBADF; | |
3867 | ||
3868 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
3869 | lnk->new_dfd = READ_ONCE(sqe->len); | |
3870 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3871 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3872 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
3873 | ||
3874 | lnk->oldpath = getname(oldf); | |
3875 | if (IS_ERR(lnk->oldpath)) | |
3876 | return PTR_ERR(lnk->oldpath); | |
3877 | ||
3878 | lnk->newpath = getname(newf); | |
3879 | if (IS_ERR(lnk->newpath)) { | |
3880 | putname(lnk->oldpath); | |
3881 | return PTR_ERR(lnk->newpath); | |
3882 | } | |
3883 | ||
3884 | req->flags |= REQ_F_NEED_CLEANUP; | |
3885 | return 0; | |
3886 | } | |
3887 | ||
04f34081 | 3888 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
3889 | { |
3890 | struct io_hardlink *lnk = &req->hardlink; | |
3891 | int ret; | |
3892 | ||
3893 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3894 | return -EAGAIN; | |
3895 | ||
3896 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
3897 | lnk->newpath, lnk->flags); | |
3898 | ||
3899 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3900 | if (ret < 0) | |
3901 | req_set_fail(req); | |
3902 | io_req_complete(req, ret); | |
3903 | return 0; | |
3904 | } | |
3905 | ||
36f4fa68 JA |
3906 | static int io_shutdown_prep(struct io_kiocb *req, |
3907 | const struct io_uring_sqe *sqe) | |
3908 | { | |
3909 | #if defined(CONFIG_NET) | |
3910 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3911 | return -EINVAL; | |
26578cda PB |
3912 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
3913 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
3914 | return -EINVAL; |
3915 | ||
3916 | req->shutdown.how = READ_ONCE(sqe->len); | |
3917 | return 0; | |
3918 | #else | |
3919 | return -EOPNOTSUPP; | |
3920 | #endif | |
3921 | } | |
3922 | ||
45d189c6 | 3923 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3924 | { |
3925 | #if defined(CONFIG_NET) | |
3926 | struct socket *sock; | |
3927 | int ret; | |
3928 | ||
45d189c6 | 3929 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3930 | return -EAGAIN; |
3931 | ||
48aba79b | 3932 | sock = sock_from_file(req->file); |
36f4fa68 | 3933 | if (unlikely(!sock)) |
48aba79b | 3934 | return -ENOTSOCK; |
36f4fa68 JA |
3935 | |
3936 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3937 | if (ret < 0) |
93d2bcd2 | 3938 | req_set_fail(req); |
36f4fa68 JA |
3939 | io_req_complete(req, ret); |
3940 | return 0; | |
3941 | #else | |
3942 | return -EOPNOTSUPP; | |
3943 | #endif | |
3944 | } | |
3945 | ||
f2a8d5c7 PB |
3946 | static int __io_splice_prep(struct io_kiocb *req, |
3947 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3948 | { |
fe7e3257 | 3949 | struct io_splice *sp = &req->splice; |
7d67af2c | 3950 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3951 | |
3232dd02 PB |
3952 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3953 | return -EINVAL; | |
7d67af2c PB |
3954 | |
3955 | sp->file_in = NULL; | |
7d67af2c PB |
3956 | sp->len = READ_ONCE(sqe->len); |
3957 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3958 | ||
3959 | if (unlikely(sp->flags & ~valid_flags)) | |
3960 | return -EINVAL; | |
3961 | ||
62906e89 | 3962 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
3963 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3964 | if (!sp->file_in) | |
3965 | return -EBADF; | |
7d67af2c | 3966 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3967 | return 0; |
3968 | } | |
3969 | ||
f2a8d5c7 PB |
3970 | static int io_tee_prep(struct io_kiocb *req, |
3971 | const struct io_uring_sqe *sqe) | |
3972 | { | |
3973 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3974 | return -EINVAL; | |
3975 | return __io_splice_prep(req, sqe); | |
3976 | } | |
3977 | ||
45d189c6 | 3978 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3979 | { |
3980 | struct io_splice *sp = &req->splice; | |
3981 | struct file *in = sp->file_in; | |
3982 | struct file *out = sp->file_out; | |
3983 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3984 | long ret = 0; | |
3985 | ||
45d189c6 | 3986 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3987 | return -EAGAIN; |
3988 | if (sp->len) | |
3989 | ret = do_tee(in, out, sp->len, flags); | |
3990 | ||
e1d767f0 PB |
3991 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3992 | io_put_file(in); | |
f2a8d5c7 PB |
3993 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3994 | ||
f2a8d5c7 | 3995 | if (ret != sp->len) |
93d2bcd2 | 3996 | req_set_fail(req); |
e1e16097 | 3997 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3998 | return 0; |
3999 | } | |
4000 | ||
4001 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4002 | { | |
fe7e3257 | 4003 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
4004 | |
4005 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4006 | sp->off_out = READ_ONCE(sqe->off); | |
4007 | return __io_splice_prep(req, sqe); | |
4008 | } | |
4009 | ||
45d189c6 | 4010 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4011 | { |
4012 | struct io_splice *sp = &req->splice; | |
4013 | struct file *in = sp->file_in; | |
4014 | struct file *out = sp->file_out; | |
4015 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4016 | loff_t *poff_in, *poff_out; | |
c9687426 | 4017 | long ret = 0; |
7d67af2c | 4018 | |
45d189c6 | 4019 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4020 | return -EAGAIN; |
7d67af2c PB |
4021 | |
4022 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4023 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4024 | |
948a7749 | 4025 | if (sp->len) |
c9687426 | 4026 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4027 | |
e1d767f0 PB |
4028 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4029 | io_put_file(in); | |
7d67af2c PB |
4030 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4031 | ||
7d67af2c | 4032 | if (ret != sp->len) |
93d2bcd2 | 4033 | req_set_fail(req); |
e1e16097 | 4034 | io_req_complete(req, ret); |
7d67af2c PB |
4035 | return 0; |
4036 | } | |
4037 | ||
2b188cc1 JA |
4038 | /* |
4039 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4040 | */ | |
889fca73 | 4041 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4042 | { |
4043 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4044 | |
def596e9 JA |
4045 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4046 | return -EINVAL; | |
4047 | ||
889fca73 | 4048 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4049 | return 0; |
4050 | } | |
4051 | ||
1155c76a | 4052 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4053 | { |
6b06314c | 4054 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4055 | |
09bb8394 JA |
4056 | if (!req->file) |
4057 | return -EBADF; | |
c992fe29 | 4058 | |
6b06314c | 4059 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4060 | return -EINVAL; |
26578cda PB |
4061 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4062 | sqe->splice_fd_in)) | |
c992fe29 CH |
4063 | return -EINVAL; |
4064 | ||
8ed8d3c3 JA |
4065 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4066 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4067 | return -EINVAL; | |
4068 | ||
4069 | req->sync.off = READ_ONCE(sqe->off); | |
4070 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4071 | return 0; |
4072 | } | |
4073 | ||
45d189c6 | 4074 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4075 | { |
8ed8d3c3 | 4076 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4077 | int ret; |
4078 | ||
ac45abc0 | 4079 | /* fsync always requires a blocking context */ |
45d189c6 | 4080 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4081 | return -EAGAIN; |
4082 | ||
9adbd45d | 4083 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4084 | end > 0 ? end : LLONG_MAX, |
4085 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4086 | if (ret < 0) | |
93d2bcd2 | 4087 | req_set_fail(req); |
e1e16097 | 4088 | io_req_complete(req, ret); |
c992fe29 CH |
4089 | return 0; |
4090 | } | |
4091 | ||
d63d1b5e JA |
4092 | static int io_fallocate_prep(struct io_kiocb *req, |
4093 | const struct io_uring_sqe *sqe) | |
4094 | { | |
26578cda PB |
4095 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4096 | sqe->splice_fd_in) | |
d63d1b5e | 4097 | return -EINVAL; |
3232dd02 PB |
4098 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4099 | return -EINVAL; | |
d63d1b5e JA |
4100 | |
4101 | req->sync.off = READ_ONCE(sqe->off); | |
4102 | req->sync.len = READ_ONCE(sqe->addr); | |
4103 | req->sync.mode = READ_ONCE(sqe->len); | |
4104 | return 0; | |
4105 | } | |
4106 | ||
45d189c6 | 4107 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4108 | { |
ac45abc0 PB |
4109 | int ret; |
4110 | ||
d63d1b5e | 4111 | /* fallocate always requiring blocking context */ |
45d189c6 | 4112 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4113 | return -EAGAIN; |
ac45abc0 PB |
4114 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4115 | req->sync.len); | |
ac45abc0 | 4116 | if (ret < 0) |
93d2bcd2 | 4117 | req_set_fail(req); |
e1e16097 | 4118 | io_req_complete(req, ret); |
5d17b4a4 JA |
4119 | return 0; |
4120 | } | |
4121 | ||
ec65fea5 | 4122 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4123 | { |
f8748881 | 4124 | const char __user *fname; |
15b71abe | 4125 | int ret; |
b7bb4f7d | 4126 | |
d3fddf6d PB |
4127 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4128 | return -EINVAL; | |
b9445598 | 4129 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4130 | return -EINVAL; |
ec65fea5 | 4131 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4132 | return -EBADF; |
03b1230c | 4133 | |
ec65fea5 PB |
4134 | /* open.how should be already initialised */ |
4135 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4136 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4137 | |
25e72d10 PB |
4138 | req->open.dfd = READ_ONCE(sqe->fd); |
4139 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4140 | req->open.filename = getname(fname); |
15b71abe JA |
4141 | if (IS_ERR(req->open.filename)) { |
4142 | ret = PTR_ERR(req->open.filename); | |
4143 | req->open.filename = NULL; | |
4144 | return ret; | |
4145 | } | |
b9445598 PB |
4146 | |
4147 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4148 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4149 | return -EINVAL; | |
4150 | ||
4022e7af | 4151 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4152 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4153 | return 0; |
03b1230c JA |
4154 | } |
4155 | ||
ec65fea5 PB |
4156 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4157 | { | |
d3fddf6d PB |
4158 | u64 mode = READ_ONCE(sqe->len); |
4159 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4160 | |
ec65fea5 PB |
4161 | req->open.how = build_open_how(flags, mode); |
4162 | return __io_openat_prep(req, sqe); | |
4163 | } | |
4164 | ||
cebdb986 | 4165 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4166 | { |
cebdb986 | 4167 | struct open_how __user *how; |
cebdb986 | 4168 | size_t len; |
0fa03c62 JA |
4169 | int ret; |
4170 | ||
cebdb986 JA |
4171 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4172 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4173 | if (len < OPEN_HOW_SIZE_VER0) |
4174 | return -EINVAL; | |
3529d8c2 | 4175 | |
cebdb986 JA |
4176 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4177 | len); | |
4178 | if (ret) | |
4179 | return ret; | |
3529d8c2 | 4180 | |
ec65fea5 | 4181 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4182 | } |
4183 | ||
45d189c6 | 4184 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4185 | { |
4186 | struct open_flags op; | |
15b71abe | 4187 | struct file *file; |
b9445598 PB |
4188 | bool resolve_nonblock, nonblock_set; |
4189 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4190 | int ret; |
4191 | ||
cebdb986 | 4192 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4193 | if (ret) |
4194 | goto err; | |
3a81fd02 JA |
4195 | nonblock_set = op.open_flag & O_NONBLOCK; |
4196 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4197 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4198 | /* |
4199 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4200 | * it'll always -EAGAIN | |
4201 | */ | |
4202 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4203 | return -EAGAIN; | |
4204 | op.lookup_flags |= LOOKUP_CACHED; | |
4205 | op.open_flag |= O_NONBLOCK; | |
4206 | } | |
15b71abe | 4207 | |
b9445598 PB |
4208 | if (!fixed) { |
4209 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4210 | if (ret < 0) | |
4211 | goto err; | |
4212 | } | |
15b71abe JA |
4213 | |
4214 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4215 | if (IS_ERR(file)) { |
944d1444 | 4216 | /* |
12dcb58a PB |
4217 | * We could hang on to this 'fd' on retrying, but seems like |
4218 | * marginal gain for something that is now known to be a slower | |
4219 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4220 | */ |
b9445598 PB |
4221 | if (!fixed) |
4222 | put_unused_fd(ret); | |
3a81fd02 | 4223 | |
15b71abe | 4224 | ret = PTR_ERR(file); |
12dcb58a PB |
4225 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4226 | if (ret == -EAGAIN && | |
4227 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4228 | return -EAGAIN; | |
4229 | goto err; | |
15b71abe | 4230 | } |
12dcb58a PB |
4231 | |
4232 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4233 | file->f_flags &= ~O_NONBLOCK; | |
4234 | fsnotify_open(file); | |
b9445598 PB |
4235 | |
4236 | if (!fixed) | |
4237 | fd_install(ret, file); | |
4238 | else | |
4239 | ret = io_install_fixed_file(req, file, issue_flags, | |
4240 | req->open.file_slot - 1); | |
15b71abe JA |
4241 | err: |
4242 | putname(req->open.filename); | |
8fef80bf | 4243 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4244 | if (ret < 0) |
93d2bcd2 | 4245 | req_set_fail(req); |
0bdf3398 | 4246 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4247 | return 0; |
4248 | } | |
4249 | ||
45d189c6 | 4250 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4251 | { |
e45cff58 | 4252 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4253 | } |
4254 | ||
067524e9 JA |
4255 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4256 | const struct io_uring_sqe *sqe) | |
4257 | { | |
4258 | struct io_provide_buf *p = &req->pbuf; | |
4259 | u64 tmp; | |
4260 | ||
26578cda PB |
4261 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4262 | sqe->splice_fd_in) | |
067524e9 JA |
4263 | return -EINVAL; |
4264 | ||
4265 | tmp = READ_ONCE(sqe->fd); | |
4266 | if (!tmp || tmp > USHRT_MAX) | |
4267 | return -EINVAL; | |
4268 | ||
4269 | memset(p, 0, sizeof(*p)); | |
4270 | p->nbufs = tmp; | |
4271 | p->bgid = READ_ONCE(sqe->buf_group); | |
4272 | return 0; | |
4273 | } | |
4274 | ||
4275 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4276 | int bgid, unsigned nbufs) | |
4277 | { | |
4278 | unsigned i = 0; | |
4279 | ||
4280 | /* shouldn't happen */ | |
4281 | if (!nbufs) | |
4282 | return 0; | |
4283 | ||
4284 | /* the head kbuf is the list itself */ | |
4285 | while (!list_empty(&buf->list)) { | |
4286 | struct io_buffer *nxt; | |
4287 | ||
4288 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4289 | list_del(&nxt->list); | |
4290 | kfree(nxt); | |
4291 | if (++i == nbufs) | |
4292 | return i; | |
4293 | } | |
4294 | i++; | |
4295 | kfree(buf); | |
9e15c3a0 | 4296 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4297 | |
4298 | return i; | |
4299 | } | |
4300 | ||
889fca73 | 4301 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4302 | { |
4303 | struct io_provide_buf *p = &req->pbuf; | |
4304 | struct io_ring_ctx *ctx = req->ctx; | |
4305 | struct io_buffer *head; | |
4306 | int ret = 0; | |
45d189c6 | 4307 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4308 | |
4309 | io_ring_submit_lock(ctx, !force_nonblock); | |
4310 | ||
4311 | lockdep_assert_held(&ctx->uring_lock); | |
4312 | ||
4313 | ret = -ENOENT; | |
9e15c3a0 | 4314 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4315 | if (head) |
4316 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4317 | if (ret < 0) |
93d2bcd2 | 4318 | req_set_fail(req); |
067524e9 | 4319 | |
9fb8cb49 PB |
4320 | /* complete before unlock, IOPOLL may need the lock */ |
4321 | __io_req_complete(req, issue_flags, ret, 0); | |
4322 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
4323 | return 0; |
4324 | } | |
4325 | ||
ddf0322d JA |
4326 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4327 | const struct io_uring_sqe *sqe) | |
4328 | { | |
38134ada | 4329 | unsigned long size, tmp_check; |
ddf0322d JA |
4330 | struct io_provide_buf *p = &req->pbuf; |
4331 | u64 tmp; | |
4332 | ||
26578cda | 4333 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4334 | return -EINVAL; |
4335 | ||
4336 | tmp = READ_ONCE(sqe->fd); | |
4337 | if (!tmp || tmp > USHRT_MAX) | |
4338 | return -E2BIG; | |
4339 | p->nbufs = tmp; | |
4340 | p->addr = READ_ONCE(sqe->addr); | |
4341 | p->len = READ_ONCE(sqe->len); | |
4342 | ||
38134ada PB |
4343 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4344 | &size)) | |
4345 | return -EOVERFLOW; | |
4346 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4347 | return -EOVERFLOW; | |
4348 | ||
d81269fe PB |
4349 | size = (unsigned long)p->len * p->nbufs; |
4350 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4351 | return -EFAULT; |
4352 | ||
4353 | p->bgid = READ_ONCE(sqe->buf_group); | |
4354 | tmp = READ_ONCE(sqe->off); | |
4355 | if (tmp > USHRT_MAX) | |
4356 | return -E2BIG; | |
4357 | p->bid = tmp; | |
4358 | return 0; | |
4359 | } | |
4360 | ||
4361 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4362 | { | |
4363 | struct io_buffer *buf; | |
4364 | u64 addr = pbuf->addr; | |
4365 | int i, bid = pbuf->bid; | |
4366 | ||
4367 | for (i = 0; i < pbuf->nbufs; i++) { | |
9990da93 | 4368 | buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); |
ddf0322d JA |
4369 | if (!buf) |
4370 | break; | |
4371 | ||
4372 | buf->addr = addr; | |
d1f82808 | 4373 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4374 | buf->bid = bid; |
4375 | addr += pbuf->len; | |
4376 | bid++; | |
4377 | if (!*head) { | |
4378 | INIT_LIST_HEAD(&buf->list); | |
4379 | *head = buf; | |
4380 | } else { | |
4381 | list_add_tail(&buf->list, &(*head)->list); | |
4382 | } | |
4383 | } | |
4384 | ||
4385 | return i ? i : -ENOMEM; | |
4386 | } | |
4387 | ||
889fca73 | 4388 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4389 | { |
4390 | struct io_provide_buf *p = &req->pbuf; | |
4391 | struct io_ring_ctx *ctx = req->ctx; | |
4392 | struct io_buffer *head, *list; | |
4393 | int ret = 0; | |
45d189c6 | 4394 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4395 | |
4396 | io_ring_submit_lock(ctx, !force_nonblock); | |
4397 | ||
4398 | lockdep_assert_held(&ctx->uring_lock); | |
4399 | ||
9e15c3a0 | 4400 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4401 | |
4402 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4403 | if (ret >= 0 && !list) { |
4404 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4405 | if (ret < 0) | |
067524e9 | 4406 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4407 | } |
ddf0322d | 4408 | if (ret < 0) |
93d2bcd2 | 4409 | req_set_fail(req); |
9fb8cb49 PB |
4410 | /* complete before unlock, IOPOLL may need the lock */ |
4411 | __io_req_complete(req, issue_flags, ret, 0); | |
4412 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4413 | return 0; |
cebdb986 JA |
4414 | } |
4415 | ||
3e4827b0 JA |
4416 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4417 | const struct io_uring_sqe *sqe) | |
4418 | { | |
4419 | #if defined(CONFIG_EPOLL) | |
26578cda | 4420 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4421 | return -EINVAL; |
2d74d042 | 4422 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4423 | return -EINVAL; |
3e4827b0 JA |
4424 | |
4425 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4426 | req->epoll.op = READ_ONCE(sqe->len); | |
4427 | req->epoll.fd = READ_ONCE(sqe->off); | |
4428 | ||
4429 | if (ep_op_has_event(req->epoll.op)) { | |
4430 | struct epoll_event __user *ev; | |
4431 | ||
4432 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4433 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4434 | return -EFAULT; | |
4435 | } | |
4436 | ||
4437 | return 0; | |
4438 | #else | |
4439 | return -EOPNOTSUPP; | |
4440 | #endif | |
4441 | } | |
4442 | ||
889fca73 | 4443 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4444 | { |
4445 | #if defined(CONFIG_EPOLL) | |
4446 | struct io_epoll *ie = &req->epoll; | |
4447 | int ret; | |
45d189c6 | 4448 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4449 | |
4450 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4451 | if (force_nonblock && ret == -EAGAIN) | |
4452 | return -EAGAIN; | |
4453 | ||
4454 | if (ret < 0) | |
93d2bcd2 | 4455 | req_set_fail(req); |
889fca73 | 4456 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4457 | return 0; |
4458 | #else | |
4459 | return -EOPNOTSUPP; | |
4460 | #endif | |
4461 | } | |
4462 | ||
c1ca757b JA |
4463 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4464 | { | |
4465 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4466 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4467 | return -EINVAL; |
3232dd02 PB |
4468 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4469 | return -EINVAL; | |
c1ca757b JA |
4470 | |
4471 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4472 | req->madvise.len = READ_ONCE(sqe->len); | |
4473 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4474 | return 0; | |
4475 | #else | |
4476 | return -EOPNOTSUPP; | |
4477 | #endif | |
4478 | } | |
4479 | ||
45d189c6 | 4480 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4481 | { |
4482 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4483 | struct io_madvise *ma = &req->madvise; | |
4484 | int ret; | |
4485 | ||
45d189c6 | 4486 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4487 | return -EAGAIN; |
4488 | ||
0726b01e | 4489 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4490 | if (ret < 0) |
93d2bcd2 | 4491 | req_set_fail(req); |
e1e16097 | 4492 | io_req_complete(req, ret); |
c1ca757b JA |
4493 | return 0; |
4494 | #else | |
4495 | return -EOPNOTSUPP; | |
4496 | #endif | |
4497 | } | |
4498 | ||
4840e418 JA |
4499 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4500 | { | |
26578cda | 4501 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4502 | return -EINVAL; |
3232dd02 PB |
4503 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4504 | return -EINVAL; | |
4840e418 JA |
4505 | |
4506 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4507 | req->fadvise.len = READ_ONCE(sqe->len); | |
4508 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4509 | return 0; | |
4510 | } | |
4511 | ||
45d189c6 | 4512 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4513 | { |
4514 | struct io_fadvise *fa = &req->fadvise; | |
4515 | int ret; | |
4516 | ||
45d189c6 | 4517 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4518 | switch (fa->advice) { |
4519 | case POSIX_FADV_NORMAL: | |
4520 | case POSIX_FADV_RANDOM: | |
4521 | case POSIX_FADV_SEQUENTIAL: | |
4522 | break; | |
4523 | default: | |
4524 | return -EAGAIN; | |
4525 | } | |
4526 | } | |
4840e418 JA |
4527 | |
4528 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4529 | if (ret < 0) | |
93d2bcd2 | 4530 | req_set_fail(req); |
0bdf3398 | 4531 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4532 | return 0; |
4533 | } | |
4534 | ||
eddc7ef5 JA |
4535 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4536 | { | |
2d74d042 | 4537 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4538 | return -EINVAL; |
26578cda | 4539 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4540 | return -EINVAL; |
9c280f90 | 4541 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4542 | return -EBADF; |
eddc7ef5 | 4543 | |
1d9e1288 BM |
4544 | req->statx.dfd = READ_ONCE(sqe->fd); |
4545 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4546 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4547 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4548 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4549 | |
4550 | return 0; | |
4551 | } | |
4552 | ||
45d189c6 | 4553 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4554 | { |
1d9e1288 | 4555 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4556 | int ret; |
4557 | ||
59d70013 | 4558 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4559 | return -EAGAIN; |
4560 | ||
e62753e4 BM |
4561 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4562 | ctx->buffer); | |
eddc7ef5 | 4563 | |
eddc7ef5 | 4564 | if (ret < 0) |
93d2bcd2 | 4565 | req_set_fail(req); |
e1e16097 | 4566 | io_req_complete(req, ret); |
eddc7ef5 JA |
4567 | return 0; |
4568 | } | |
4569 | ||
b5dba59e JA |
4570 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4571 | { | |
14587a46 | 4572 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4573 | return -EINVAL; |
b5dba59e | 4574 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 4575 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 4576 | return -EINVAL; |
9c280f90 | 4577 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4578 | return -EBADF; |
b5dba59e JA |
4579 | |
4580 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
4581 | req->close.file_slot = READ_ONCE(sqe->file_index); |
4582 | if (req->close.file_slot && req->close.fd) | |
4583 | return -EINVAL; | |
4584 | ||
b5dba59e | 4585 | return 0; |
b5dba59e JA |
4586 | } |
4587 | ||
889fca73 | 4588 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4589 | { |
9eac1904 | 4590 | struct files_struct *files = current->files; |
3af73b28 | 4591 | struct io_close *close = &req->close; |
9eac1904 | 4592 | struct fdtable *fdt; |
a1fde923 PB |
4593 | struct file *file = NULL; |
4594 | int ret = -EBADF; | |
b5dba59e | 4595 | |
7df778be PB |
4596 | if (req->close.file_slot) { |
4597 | ret = io_close_fixed(req, issue_flags); | |
4598 | goto err; | |
4599 | } | |
4600 | ||
9eac1904 JA |
4601 | spin_lock(&files->file_lock); |
4602 | fdt = files_fdtable(files); | |
4603 | if (close->fd >= fdt->max_fds) { | |
4604 | spin_unlock(&files->file_lock); | |
4605 | goto err; | |
4606 | } | |
4607 | file = fdt->fd[close->fd]; | |
a1fde923 | 4608 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4609 | spin_unlock(&files->file_lock); |
4610 | file = NULL; | |
4611 | goto err; | |
3af73b28 | 4612 | } |
b5dba59e JA |
4613 | |
4614 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4615 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4616 | spin_unlock(&files->file_lock); |
0bf0eefd | 4617 | return -EAGAIN; |
a2100672 | 4618 | } |
b5dba59e | 4619 | |
9eac1904 JA |
4620 | ret = __close_fd_get_file(close->fd, &file); |
4621 | spin_unlock(&files->file_lock); | |
4622 | if (ret < 0) { | |
4623 | if (ret == -ENOENT) | |
4624 | ret = -EBADF; | |
4625 | goto err; | |
4626 | } | |
4627 | ||
3af73b28 | 4628 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4629 | ret = filp_close(file, current->files); |
4630 | err: | |
3af73b28 | 4631 | if (ret < 0) |
93d2bcd2 | 4632 | req_set_fail(req); |
9eac1904 JA |
4633 | if (file) |
4634 | fput(file); | |
889fca73 | 4635 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4636 | return 0; |
b5dba59e JA |
4637 | } |
4638 | ||
1155c76a | 4639 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4640 | { |
4641 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4642 | |
5d17b4a4 JA |
4643 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4644 | return -EINVAL; | |
26578cda PB |
4645 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4646 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4647 | return -EINVAL; |
4648 | ||
8ed8d3c3 JA |
4649 | req->sync.off = READ_ONCE(sqe->off); |
4650 | req->sync.len = READ_ONCE(sqe->len); | |
4651 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4652 | return 0; |
4653 | } | |
4654 | ||
45d189c6 | 4655 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4656 | { |
8ed8d3c3 JA |
4657 | int ret; |
4658 | ||
ac45abc0 | 4659 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4660 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4661 | return -EAGAIN; |
4662 | ||
9adbd45d | 4663 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4664 | req->sync.flags); |
4665 | if (ret < 0) | |
93d2bcd2 | 4666 | req_set_fail(req); |
e1e16097 | 4667 | io_req_complete(req, ret); |
5d17b4a4 JA |
4668 | return 0; |
4669 | } | |
4670 | ||
469956e8 | 4671 | #if defined(CONFIG_NET) |
02d27d89 PB |
4672 | static int io_setup_async_msg(struct io_kiocb *req, |
4673 | struct io_async_msghdr *kmsg) | |
4674 | { | |
e8c2bc1f JA |
4675 | struct io_async_msghdr *async_msg = req->async_data; |
4676 | ||
4677 | if (async_msg) | |
02d27d89 | 4678 | return -EAGAIN; |
e8c2bc1f | 4679 | if (io_alloc_async_data(req)) { |
257e84a5 | 4680 | kfree(kmsg->free_iov); |
02d27d89 PB |
4681 | return -ENOMEM; |
4682 | } | |
e8c2bc1f | 4683 | async_msg = req->async_data; |
02d27d89 | 4684 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4685 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4686 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4687 | /* if were using fast_iov, set it to the new one */ |
4688 | if (!async_msg->free_iov) | |
4689 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4690 | ||
02d27d89 PB |
4691 | return -EAGAIN; |
4692 | } | |
4693 | ||
2ae523ed PB |
4694 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4695 | struct io_async_msghdr *iomsg) | |
4696 | { | |
2ae523ed | 4697 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4698 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4699 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4700 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4701 | } |
4702 | ||
93642ef8 PB |
4703 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4704 | { | |
4705 | int ret; | |
4706 | ||
93642ef8 PB |
4707 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4708 | if (!ret) | |
4709 | req->flags |= REQ_F_NEED_CLEANUP; | |
4710 | return ret; | |
4711 | } | |
4712 | ||
3529d8c2 | 4713 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4714 | { |
e47293fd | 4715 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4716 | |
d2b6f48b PB |
4717 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4718 | return -EINVAL; | |
4719 | ||
270a5940 | 4720 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4721 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4722 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4723 | if (sr->msg_flags & MSG_DONTWAIT) | |
4724 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4725 | |
d8768362 JA |
4726 | #ifdef CONFIG_COMPAT |
4727 | if (req->ctx->compat) | |
4728 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4729 | #endif | |
93642ef8 | 4730 | return 0; |
03b1230c JA |
4731 | } |
4732 | ||
889fca73 | 4733 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4734 | { |
6b754c8b | 4735 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4736 | struct socket *sock; |
7a7cacba | 4737 | unsigned flags; |
0031275d | 4738 | int min_ret = 0; |
0fa03c62 JA |
4739 | int ret; |
4740 | ||
dba4a925 | 4741 | sock = sock_from_file(req->file); |
7a7cacba | 4742 | if (unlikely(!sock)) |
dba4a925 | 4743 | return -ENOTSOCK; |
3529d8c2 | 4744 | |
d886e185 PB |
4745 | if (req_has_async_data(req)) { |
4746 | kmsg = req->async_data; | |
4747 | } else { | |
7a7cacba PB |
4748 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4749 | if (ret) | |
4750 | return ret; | |
4751 | kmsg = &iomsg; | |
0fa03c62 | 4752 | } |
0fa03c62 | 4753 | |
04411806 PB |
4754 | flags = req->sr_msg.msg_flags; |
4755 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4756 | flags |= MSG_DONTWAIT; |
0031275d SM |
4757 | if (flags & MSG_WAITALL) |
4758 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4759 | ||
7a7cacba | 4760 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4761 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4762 | return io_setup_async_msg(req, kmsg); |
4763 | if (ret == -ERESTARTSYS) | |
4764 | ret = -EINTR; | |
0fa03c62 | 4765 | |
257e84a5 PB |
4766 | /* fast path, check for non-NULL to avoid function call */ |
4767 | if (kmsg->free_iov) | |
4768 | kfree(kmsg->free_iov); | |
99bc4c38 | 4769 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4770 | if (ret < min_ret) |
93d2bcd2 | 4771 | req_set_fail(req); |
889fca73 | 4772 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4773 | return 0; |
03b1230c | 4774 | } |
aa1fa28f | 4775 | |
889fca73 | 4776 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4777 | { |
7a7cacba PB |
4778 | struct io_sr_msg *sr = &req->sr_msg; |
4779 | struct msghdr msg; | |
4780 | struct iovec iov; | |
fddaface | 4781 | struct socket *sock; |
7a7cacba | 4782 | unsigned flags; |
0031275d | 4783 | int min_ret = 0; |
fddaface JA |
4784 | int ret; |
4785 | ||
dba4a925 | 4786 | sock = sock_from_file(req->file); |
7a7cacba | 4787 | if (unlikely(!sock)) |
dba4a925 | 4788 | return -ENOTSOCK; |
fddaface | 4789 | |
7a7cacba PB |
4790 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4791 | if (unlikely(ret)) | |
14db8411 | 4792 | return ret; |
fddaface | 4793 | |
7a7cacba PB |
4794 | msg.msg_name = NULL; |
4795 | msg.msg_control = NULL; | |
4796 | msg.msg_controllen = 0; | |
4797 | msg.msg_namelen = 0; | |
fddaface | 4798 | |
04411806 PB |
4799 | flags = req->sr_msg.msg_flags; |
4800 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4801 | flags |= MSG_DONTWAIT; |
0031275d SM |
4802 | if (flags & MSG_WAITALL) |
4803 | min_ret = iov_iter_count(&msg.msg_iter); | |
4804 | ||
7a7cacba PB |
4805 | msg.msg_flags = flags; |
4806 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4807 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4808 | return -EAGAIN; |
4809 | if (ret == -ERESTARTSYS) | |
4810 | ret = -EINTR; | |
fddaface | 4811 | |
0031275d | 4812 | if (ret < min_ret) |
93d2bcd2 | 4813 | req_set_fail(req); |
889fca73 | 4814 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4815 | return 0; |
fddaface JA |
4816 | } |
4817 | ||
1400e697 PB |
4818 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4819 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4820 | { |
4821 | struct io_sr_msg *sr = &req->sr_msg; | |
4822 | struct iovec __user *uiov; | |
4823 | size_t iov_len; | |
4824 | int ret; | |
4825 | ||
1400e697 PB |
4826 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4827 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4828 | if (ret) |
4829 | return ret; | |
4830 | ||
4831 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4832 | if (iov_len > 1) | |
4833 | return -EINVAL; | |
5476dfed | 4834 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4835 | return -EFAULT; |
5476dfed | 4836 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4837 | iomsg->free_iov = NULL; |
52de1fe1 | 4838 | } else { |
257e84a5 | 4839 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4840 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4841 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4842 | false); |
52de1fe1 JA |
4843 | if (ret > 0) |
4844 | ret = 0; | |
4845 | } | |
4846 | ||
4847 | return ret; | |
4848 | } | |
4849 | ||
4850 | #ifdef CONFIG_COMPAT | |
4851 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4852 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4853 | { |
52de1fe1 JA |
4854 | struct io_sr_msg *sr = &req->sr_msg; |
4855 | struct compat_iovec __user *uiov; | |
4856 | compat_uptr_t ptr; | |
4857 | compat_size_t len; | |
4858 | int ret; | |
4859 | ||
4af3417a PB |
4860 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4861 | &ptr, &len); | |
52de1fe1 JA |
4862 | if (ret) |
4863 | return ret; | |
4864 | ||
4865 | uiov = compat_ptr(ptr); | |
4866 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4867 | compat_ssize_t clen; | |
4868 | ||
4869 | if (len > 1) | |
4870 | return -EINVAL; | |
4871 | if (!access_ok(uiov, sizeof(*uiov))) | |
4872 | return -EFAULT; | |
4873 | if (__get_user(clen, &uiov->iov_len)) | |
4874 | return -EFAULT; | |
4875 | if (clen < 0) | |
4876 | return -EINVAL; | |
2d280bc8 | 4877 | sr->len = clen; |
257e84a5 | 4878 | iomsg->free_iov = NULL; |
52de1fe1 | 4879 | } else { |
257e84a5 | 4880 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4881 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4882 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4883 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4884 | if (ret < 0) |
4885 | return ret; | |
4886 | } | |
4887 | ||
4888 | return 0; | |
4889 | } | |
4890 | #endif | |
4891 | ||
1400e697 PB |
4892 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4893 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4894 | { |
1400e697 | 4895 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4896 | |
4897 | #ifdef CONFIG_COMPAT | |
4898 | if (req->ctx->compat) | |
1400e697 | 4899 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4900 | #endif |
52de1fe1 | 4901 | |
1400e697 | 4902 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4903 | } |
4904 | ||
bcda7baa | 4905 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4906 | bool needs_lock) |
bcda7baa JA |
4907 | { |
4908 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 4909 | |
30d51dd4 | 4910 | return io_buffer_select(req, &sr->len, sr->bgid, needs_lock); |
fddaface JA |
4911 | } |
4912 | ||
7fbb1b54 PB |
4913 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4914 | { | |
30d51dd4 | 4915 | return io_put_kbuf(req, req->kbuf); |
7fbb1b54 PB |
4916 | } |
4917 | ||
93642ef8 | 4918 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4919 | { |
99bc4c38 | 4920 | int ret; |
3529d8c2 | 4921 | |
93642ef8 PB |
4922 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4923 | if (!ret) | |
4924 | req->flags |= REQ_F_NEED_CLEANUP; | |
4925 | return ret; | |
4926 | } | |
4927 | ||
4928 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4929 | { | |
4930 | struct io_sr_msg *sr = &req->sr_msg; | |
4931 | ||
d2b6f48b PB |
4932 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4933 | return -EINVAL; | |
4934 | ||
270a5940 | 4935 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4936 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4937 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4938 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4939 | if (sr->msg_flags & MSG_DONTWAIT) | |
4940 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4941 | |
d8768362 JA |
4942 | #ifdef CONFIG_COMPAT |
4943 | if (req->ctx->compat) | |
4944 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4945 | #endif | |
93642ef8 | 4946 | return 0; |
aa1fa28f JA |
4947 | } |
4948 | ||
889fca73 | 4949 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4950 | { |
6b754c8b | 4951 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4952 | struct socket *sock; |
7fbb1b54 | 4953 | struct io_buffer *kbuf; |
7a7cacba | 4954 | unsigned flags; |
0031275d | 4955 | int min_ret = 0; |
52de1fe1 | 4956 | int ret, cflags = 0; |
45d189c6 | 4957 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4958 | |
dba4a925 | 4959 | sock = sock_from_file(req->file); |
7a7cacba | 4960 | if (unlikely(!sock)) |
dba4a925 | 4961 | return -ENOTSOCK; |
3529d8c2 | 4962 | |
d886e185 PB |
4963 | if (req_has_async_data(req)) { |
4964 | kmsg = req->async_data; | |
4965 | } else { | |
7a7cacba PB |
4966 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4967 | if (ret) | |
681fda8d | 4968 | return ret; |
7a7cacba PB |
4969 | kmsg = &iomsg; |
4970 | } | |
03b1230c | 4971 | |
bc02ef33 | 4972 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4973 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4974 | if (IS_ERR(kbuf)) |
52de1fe1 | 4975 | return PTR_ERR(kbuf); |
7a7cacba | 4976 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4977 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4978 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4979 | 1, req->sr_msg.len); |
4980 | } | |
52de1fe1 | 4981 | |
04411806 PB |
4982 | flags = req->sr_msg.msg_flags; |
4983 | if (force_nonblock) | |
7a7cacba | 4984 | flags |= MSG_DONTWAIT; |
0031275d SM |
4985 | if (flags & MSG_WAITALL) |
4986 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4987 | ||
7a7cacba PB |
4988 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4989 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4990 | if (force_nonblock && ret == -EAGAIN) |
4991 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4992 | if (ret == -ERESTARTSYS) |
4993 | ret = -EINTR; | |
03b1230c | 4994 | |
7fbb1b54 PB |
4995 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4996 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4997 | /* fast path, check for non-NULL to avoid function call */ |
4998 | if (kmsg->free_iov) | |
4999 | kfree(kmsg->free_iov); | |
99bc4c38 | 5000 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 5001 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5002 | req_set_fail(req); |
889fca73 | 5003 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 5004 | return 0; |
0fa03c62 | 5005 | } |
5d17b4a4 | 5006 | |
889fca73 | 5007 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5008 | { |
6b754c8b | 5009 | struct io_buffer *kbuf; |
7a7cacba PB |
5010 | struct io_sr_msg *sr = &req->sr_msg; |
5011 | struct msghdr msg; | |
5012 | void __user *buf = sr->buf; | |
fddaface | 5013 | struct socket *sock; |
7a7cacba PB |
5014 | struct iovec iov; |
5015 | unsigned flags; | |
0031275d | 5016 | int min_ret = 0; |
bcda7baa | 5017 | int ret, cflags = 0; |
45d189c6 | 5018 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5019 | |
dba4a925 | 5020 | sock = sock_from_file(req->file); |
7a7cacba | 5021 | if (unlikely(!sock)) |
dba4a925 | 5022 | return -ENOTSOCK; |
fddaface | 5023 | |
bc02ef33 | 5024 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 5025 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
5026 | if (IS_ERR(kbuf)) |
5027 | return PTR_ERR(kbuf); | |
7a7cacba | 5028 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5029 | } |
bcda7baa | 5030 | |
7a7cacba | 5031 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5032 | if (unlikely(ret)) |
5033 | goto out_free; | |
fddaface | 5034 | |
7a7cacba PB |
5035 | msg.msg_name = NULL; |
5036 | msg.msg_control = NULL; | |
5037 | msg.msg_controllen = 0; | |
5038 | msg.msg_namelen = 0; | |
5039 | msg.msg_iocb = NULL; | |
5040 | msg.msg_flags = 0; | |
fddaface | 5041 | |
04411806 PB |
5042 | flags = req->sr_msg.msg_flags; |
5043 | if (force_nonblock) | |
7a7cacba | 5044 | flags |= MSG_DONTWAIT; |
0031275d SM |
5045 | if (flags & MSG_WAITALL) |
5046 | min_ret = iov_iter_count(&msg.msg_iter); | |
5047 | ||
7a7cacba PB |
5048 | ret = sock_recvmsg(sock, &msg, flags); |
5049 | if (force_nonblock && ret == -EAGAIN) | |
5050 | return -EAGAIN; | |
5051 | if (ret == -ERESTARTSYS) | |
5052 | ret = -EINTR; | |
14c32eee | 5053 | out_free: |
7fbb1b54 PB |
5054 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5055 | cflags = io_put_recv_kbuf(req); | |
0031275d | 5056 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5057 | req_set_fail(req); |
889fca73 | 5058 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5059 | return 0; |
fddaface JA |
5060 | } |
5061 | ||
3529d8c2 | 5062 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5063 | { |
8ed8d3c3 JA |
5064 | struct io_accept *accept = &req->accept; |
5065 | ||
14587a46 | 5066 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5067 | return -EINVAL; |
aaa4db12 | 5068 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5069 | return -EINVAL; |
5070 | ||
d55e5f5b JA |
5071 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5072 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5073 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5074 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5075 | |
aaa4db12 PB |
5076 | accept->file_slot = READ_ONCE(sqe->file_index); |
5077 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
5078 | (accept->flags & SOCK_CLOEXEC))) | |
5079 | return -EINVAL; | |
a7083ad5 PB |
5080 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5081 | return -EINVAL; | |
5082 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5083 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5084 | return 0; |
8ed8d3c3 | 5085 | } |
17f2fe35 | 5086 | |
889fca73 | 5087 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5088 | { |
5089 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5090 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5091 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5092 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5093 | struct file *file; |
5094 | int ret, fd; | |
8ed8d3c3 | 5095 | |
e697deed JX |
5096 | if (req->file->f_flags & O_NONBLOCK) |
5097 | req->flags |= REQ_F_NOWAIT; | |
5098 | ||
aaa4db12 PB |
5099 | if (!fixed) { |
5100 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5101 | if (unlikely(fd < 0)) | |
5102 | return fd; | |
5103 | } | |
a7083ad5 PB |
5104 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5105 | accept->flags); | |
5106 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5107 | if (!fixed) |
5108 | put_unused_fd(fd); | |
a7083ad5 PB |
5109 | ret = PTR_ERR(file); |
5110 | if (ret == -EAGAIN && force_nonblock) | |
5111 | return -EAGAIN; | |
ac45abc0 PB |
5112 | if (ret == -ERESTARTSYS) |
5113 | ret = -EINTR; | |
93d2bcd2 | 5114 | req_set_fail(req); |
aaa4db12 | 5115 | } else if (!fixed) { |
a7083ad5 PB |
5116 | fd_install(fd, file); |
5117 | ret = fd; | |
aaa4db12 PB |
5118 | } else { |
5119 | ret = io_install_fixed_file(req, file, issue_flags, | |
5120 | accept->file_slot - 1); | |
ac45abc0 | 5121 | } |
889fca73 | 5122 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5123 | return 0; |
8ed8d3c3 JA |
5124 | } |
5125 | ||
93642ef8 PB |
5126 | static int io_connect_prep_async(struct io_kiocb *req) |
5127 | { | |
5128 | struct io_async_connect *io = req->async_data; | |
5129 | struct io_connect *conn = &req->connect; | |
5130 | ||
5131 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5132 | } | |
5133 | ||
3529d8c2 | 5134 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5135 | { |
3529d8c2 | 5136 | struct io_connect *conn = &req->connect; |
f499a021 | 5137 | |
14587a46 | 5138 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5139 | return -EINVAL; |
26578cda PB |
5140 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5141 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5142 | return -EINVAL; |
5143 | ||
3529d8c2 JA |
5144 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5145 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5146 | return 0; |
f499a021 JA |
5147 | } |
5148 | ||
889fca73 | 5149 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5150 | { |
e8c2bc1f | 5151 | struct io_async_connect __io, *io; |
f8e85cf2 | 5152 | unsigned file_flags; |
3fbb51c1 | 5153 | int ret; |
45d189c6 | 5154 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5155 | |
d886e185 | 5156 | if (req_has_async_data(req)) { |
e8c2bc1f | 5157 | io = req->async_data; |
f499a021 | 5158 | } else { |
3529d8c2 JA |
5159 | ret = move_addr_to_kernel(req->connect.addr, |
5160 | req->connect.addr_len, | |
e8c2bc1f | 5161 | &__io.address); |
f499a021 JA |
5162 | if (ret) |
5163 | goto out; | |
5164 | io = &__io; | |
5165 | } | |
5166 | ||
3fbb51c1 JA |
5167 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5168 | ||
e8c2bc1f | 5169 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5170 | req->connect.addr_len, file_flags); |
87f80d62 | 5171 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 5172 | if (req_has_async_data(req)) |
b7bb4f7d | 5173 | return -EAGAIN; |
e8c2bc1f | 5174 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5175 | ret = -ENOMEM; |
5176 | goto out; | |
5177 | } | |
e8c2bc1f | 5178 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5179 | return -EAGAIN; |
f499a021 | 5180 | } |
f8e85cf2 JA |
5181 | if (ret == -ERESTARTSYS) |
5182 | ret = -EINTR; | |
f499a021 | 5183 | out: |
4e88d6e7 | 5184 | if (ret < 0) |
93d2bcd2 | 5185 | req_set_fail(req); |
889fca73 | 5186 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5187 | return 0; |
469956e8 Y |
5188 | } |
5189 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5190 | #define IO_NETOP_FN(op) \ |
5191 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5192 | { \ | |
5193 | return -EOPNOTSUPP; \ | |
5194 | } | |
5195 | ||
5196 | #define IO_NETOP_PREP(op) \ | |
5197 | IO_NETOP_FN(op) \ | |
5198 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5199 | { \ | |
5200 | return -EOPNOTSUPP; \ | |
5201 | } \ | |
5202 | ||
5203 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5204 | IO_NETOP_PREP(op) \ | |
5205 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5206 | { \ | |
5207 | return -EOPNOTSUPP; \ | |
5208 | } | |
5209 | ||
5210 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5211 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5212 | IO_NETOP_PREP_ASYNC(connect); | |
5213 | IO_NETOP_PREP(accept); | |
5214 | IO_NETOP_FN(send); | |
5215 | IO_NETOP_FN(recv); | |
469956e8 | 5216 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5217 | |
d7718a9d JA |
5218 | struct io_poll_table { |
5219 | struct poll_table_struct pt; | |
5220 | struct io_kiocb *req; | |
68b11e8b | 5221 | int nr_entries; |
d7718a9d JA |
5222 | int error; |
5223 | }; | |
ce593a6c | 5224 | |
d7718a9d | 5225 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 5226 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 5227 | { |
d7718a9d JA |
5228 | /* for instances that support it check for an event match first: */ |
5229 | if (mask && !(mask & poll->events)) | |
5230 | return 0; | |
5231 | ||
5232 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5233 | ||
5234 | list_del_init(&poll->wait.entry); | |
5235 | ||
d7718a9d | 5236 | req->result = mask; |
5b0a6acc | 5237 | req->io_task_work.func = func; |
6d816e08 | 5238 | |
d7718a9d | 5239 | /* |
e3aabf95 JA |
5240 | * If this fails, then the task is exiting. When a task exits, the |
5241 | * work gets canceled, so just cancel this request as well instead | |
5242 | * of executing it. We can't safely execute it anyway, as we may not | |
5243 | * have the needed state needed for it anyway. | |
d7718a9d | 5244 | */ |
e09ee510 | 5245 | io_req_task_work_add(req); |
d7718a9d JA |
5246 | return 1; |
5247 | } | |
5248 | ||
74ce6ce4 JA |
5249 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5250 | __acquires(&req->ctx->completion_lock) | |
5251 | { | |
5252 | struct io_ring_ctx *ctx = req->ctx; | |
5253 | ||
316319e8 | 5254 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 PB |
5255 | if (unlikely(req->task->flags & PF_EXITING)) |
5256 | WRITE_ONCE(poll->canceled, true); | |
5257 | ||
74ce6ce4 JA |
5258 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5259 | struct poll_table_struct pt = { ._key = poll->events }; | |
5260 | ||
5261 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5262 | } | |
5263 | ||
79ebeaee | 5264 | spin_lock(&ctx->completion_lock); |
74ce6ce4 JA |
5265 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5266 | add_wait_queue(poll->head, &poll->wait); | |
5267 | return true; | |
5268 | } | |
5269 | ||
5270 | return false; | |
5271 | } | |
5272 | ||
d4e7cd36 | 5273 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5274 | { |
e8c2bc1f | 5275 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5276 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5277 | return req->async_data; |
d4e7cd36 JA |
5278 | return req->apoll->double_poll; |
5279 | } | |
5280 | ||
5281 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5282 | { | |
5283 | if (req->opcode == IORING_OP_POLL_ADD) | |
5284 | return &req->poll; | |
5285 | return &req->apoll->poll; | |
5286 | } | |
5287 | ||
5288 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 5289 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
5290 | { |
5291 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5292 | |
5293 | lockdep_assert_held(&req->ctx->completion_lock); | |
5294 | ||
5295 | if (poll && poll->head) { | |
5296 | struct wait_queue_head *head = poll->head; | |
5297 | ||
79ebeaee | 5298 | spin_lock_irq(&head->lock); |
18bceab1 JA |
5299 | list_del_init(&poll->wait.entry); |
5300 | if (poll->wait.private) | |
de9b4cca | 5301 | req_ref_put(req); |
18bceab1 | 5302 | poll->head = NULL; |
79ebeaee | 5303 | spin_unlock_irq(&head->lock); |
18bceab1 JA |
5304 | } |
5305 | } | |
5306 | ||
31efe48e | 5307 | static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 5308 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
5309 | { |
5310 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 5311 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 5312 | int error; |
18bceab1 | 5313 | |
e27414be | 5314 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 5315 | error = -ECANCELED; |
88e41cf9 | 5316 | req->poll.events |= EPOLLONESHOT; |
e27414be | 5317 | } else { |
5082620f | 5318 | error = mangle_poll(mask); |
e27414be | 5319 | } |
b69de288 JA |
5320 | if (req->poll.events & EPOLLONESHOT) |
5321 | flags = 0; | |
a62682f9 HX |
5322 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
5323 | req->poll.events |= EPOLLONESHOT; | |
88e41cf9 | 5324 | flags = 0; |
a62682f9 | 5325 | } |
7b289c38 HX |
5326 | if (flags & IORING_CQE_F_MORE) |
5327 | ctx->cq_extra++; | |
18bceab1 | 5328 | |
88e41cf9 | 5329 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
5330 | } |
5331 | ||
f237c30a | 5332 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5333 | { |
5334 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 5335 | struct io_kiocb *nxt; |
18bceab1 JA |
5336 | |
5337 | if (io_poll_rewait(req, &req->poll)) { | |
79ebeaee | 5338 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5339 | } else { |
f40b964a | 5340 | bool done; |
18bceab1 | 5341 | |
5b7aa38d HX |
5342 | if (req->poll.done) { |
5343 | spin_unlock(&ctx->completion_lock); | |
5344 | return; | |
5345 | } | |
31efe48e | 5346 | done = __io_poll_complete(req, req->result); |
88e41cf9 | 5347 | if (done) { |
a890d01e | 5348 | io_poll_remove_double(req); |
88e41cf9 | 5349 | hash_del(&req->hash_node); |
bd99c71b | 5350 | req->poll.done = true; |
f40b964a | 5351 | } else { |
88e41cf9 JA |
5352 | req->result = 0; |
5353 | add_wait_queue(req->poll.head, &req->poll.wait); | |
5354 | } | |
31efe48e | 5355 | io_commit_cqring(ctx); |
79ebeaee | 5356 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5357 | io_cqring_ev_posted(ctx); |
18bceab1 | 5358 | |
88e41cf9 JA |
5359 | if (done) { |
5360 | nxt = io_put_req_find_next(req); | |
5361 | if (nxt) | |
f237c30a | 5362 | io_req_task_submit(nxt, locked); |
88e41cf9 | 5363 | } |
dd221f46 | 5364 | } |
18bceab1 JA |
5365 | } |
5366 | ||
5367 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5368 | int sync, void *key) | |
5369 | { | |
5370 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5371 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 | 5372 | __poll_t mask = key_to_poll(key); |
79ebeaee | 5373 | unsigned long flags; |
18bceab1 JA |
5374 | |
5375 | /* for instances that support it check for an event match first: */ | |
5376 | if (mask && !(mask & poll->events)) | |
5377 | return 0; | |
88e41cf9 JA |
5378 | if (!(poll->events & EPOLLONESHOT)) |
5379 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5380 | |
8706e04e JA |
5381 | list_del_init(&wait->entry); |
5382 | ||
9ce85ef2 | 5383 | if (poll->head) { |
18bceab1 JA |
5384 | bool done; |
5385 | ||
79ebeaee | 5386 | spin_lock_irqsave(&poll->head->lock, flags); |
807abcb0 | 5387 | done = list_empty(&poll->wait.entry); |
18bceab1 | 5388 | if (!done) |
807abcb0 | 5389 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5390 | /* make sure double remove sees this as being gone */ |
5391 | wait->private = NULL; | |
79ebeaee | 5392 | spin_unlock_irqrestore(&poll->head->lock, flags); |
c8b5e260 JA |
5393 | if (!done) { |
5394 | /* use wait func handler, so it matches the rq type */ | |
5395 | poll->wait.func(&poll->wait, mode, sync, key); | |
5396 | } | |
18bceab1 | 5397 | } |
de9b4cca | 5398 | req_ref_put(req); |
18bceab1 JA |
5399 | return 1; |
5400 | } | |
5401 | ||
5402 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5403 | wait_queue_func_t wake_func) | |
5404 | { | |
5405 | poll->head = NULL; | |
5406 | poll->done = false; | |
5407 | poll->canceled = false; | |
464dca61 JA |
5408 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5409 | /* mask in events that we always want/need */ | |
5410 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5411 | INIT_LIST_HEAD(&poll->wait.entry); |
5412 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5413 | } | |
5414 | ||
5415 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5416 | struct wait_queue_head *head, |
5417 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5418 | { |
5419 | struct io_kiocb *req = pt->req; | |
5420 | ||
5421 | /* | |
68b11e8b PB |
5422 | * The file being polled uses multiple waitqueues for poll handling |
5423 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5424 | * if this happens. | |
18bceab1 | 5425 | */ |
68b11e8b | 5426 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5427 | struct io_poll_iocb *poll_one = poll; |
5428 | ||
23a65db8 PB |
5429 | /* double add on the same waitqueue head, ignore */ |
5430 | if (poll_one->head == head) | |
5431 | return; | |
18bceab1 | 5432 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5433 | if (*poll_ptr) { |
23a65db8 PB |
5434 | if ((*poll_ptr)->head == head) |
5435 | return; | |
18bceab1 JA |
5436 | pt->error = -EINVAL; |
5437 | return; | |
5438 | } | |
ea6a693d JA |
5439 | /* |
5440 | * Can't handle multishot for double wait for now, turn it | |
5441 | * into one-shot mode. | |
5442 | */ | |
7a274727 PB |
5443 | if (!(poll_one->events & EPOLLONESHOT)) |
5444 | poll_one->events |= EPOLLONESHOT; | |
18bceab1 JA |
5445 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5446 | if (!poll) { | |
5447 | pt->error = -ENOMEM; | |
5448 | return; | |
5449 | } | |
58852d4d | 5450 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5451 | req_ref_get(req); |
18bceab1 | 5452 | poll->wait.private = req; |
d886e185 | 5453 | |
807abcb0 | 5454 | *poll_ptr = poll; |
d886e185 PB |
5455 | if (req->opcode == IORING_OP_POLL_ADD) |
5456 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
5457 | } |
5458 | ||
68b11e8b | 5459 | pt->nr_entries++; |
18bceab1 | 5460 | poll->head = head; |
a31eb4a2 JX |
5461 | |
5462 | if (poll->events & EPOLLEXCLUSIVE) | |
5463 | add_wait_queue_exclusive(head, &poll->wait); | |
5464 | else | |
5465 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5466 | } |
5467 | ||
5468 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5469 | struct poll_table_struct *p) | |
5470 | { | |
5471 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5472 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5473 | |
807abcb0 | 5474 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5475 | } |
5476 | ||
f237c30a | 5477 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
d7718a9d | 5478 | { |
d7718a9d JA |
5479 | struct async_poll *apoll = req->apoll; |
5480 | struct io_ring_ctx *ctx = req->ctx; | |
5481 | ||
236daeae | 5482 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5483 | |
74ce6ce4 | 5484 | if (io_poll_rewait(req, &apoll->poll)) { |
79ebeaee | 5485 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5486 | return; |
d7718a9d JA |
5487 | } |
5488 | ||
0ea13b44 | 5489 | hash_del(&req->hash_node); |
d4e7cd36 | 5490 | io_poll_remove_double(req); |
bd99c71b | 5491 | apoll->poll.done = true; |
79ebeaee | 5492 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5493 | |
0be0b0e3 | 5494 | if (!READ_ONCE(apoll->poll.canceled)) |
f237c30a | 5495 | io_req_task_submit(req, locked); |
0be0b0e3 | 5496 | else |
2593553a | 5497 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5498 | } |
5499 | ||
5500 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5501 | void *key) | |
5502 | { | |
5503 | struct io_kiocb *req = wait->private; | |
5504 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5505 | ||
5506 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5507 | key_to_poll(key)); | |
5508 | ||
5509 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5510 | } | |
5511 | ||
5512 | static void io_poll_req_insert(struct io_kiocb *req) | |
5513 | { | |
5514 | struct io_ring_ctx *ctx = req->ctx; | |
5515 | struct hlist_head *list; | |
5516 | ||
5517 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5518 | hlist_add_head(&req->hash_node, list); | |
5519 | } | |
5520 | ||
5521 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5522 | struct io_poll_iocb *poll, | |
5523 | struct io_poll_table *ipt, __poll_t mask, | |
5524 | wait_queue_func_t wake_func) | |
5525 | __acquires(&ctx->completion_lock) | |
5526 | { | |
5527 | struct io_ring_ctx *ctx = req->ctx; | |
5528 | bool cancel = false; | |
5529 | ||
4d52f338 | 5530 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5531 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5532 | poll->file = req->file; |
18bceab1 | 5533 | poll->wait.private = req; |
d7718a9d JA |
5534 | |
5535 | ipt->pt._key = mask; | |
5536 | ipt->req = req; | |
68b11e8b PB |
5537 | ipt->error = 0; |
5538 | ipt->nr_entries = 0; | |
d7718a9d | 5539 | |
d7718a9d | 5540 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5541 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5542 | ipt->error = -EINVAL; | |
d7718a9d | 5543 | |
79ebeaee | 5544 | spin_lock(&ctx->completion_lock); |
a890d01e | 5545 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5546 | io_poll_remove_double(req); |
d7718a9d | 5547 | if (likely(poll->head)) { |
79ebeaee | 5548 | spin_lock_irq(&poll->head->lock); |
d7718a9d JA |
5549 | if (unlikely(list_empty(&poll->wait.entry))) { |
5550 | if (ipt->error) | |
5551 | cancel = true; | |
5552 | ipt->error = 0; | |
5553 | mask = 0; | |
5554 | } | |
88e41cf9 | 5555 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5556 | list_del_init(&poll->wait.entry); |
5557 | else if (cancel) | |
5558 | WRITE_ONCE(poll->canceled, true); | |
5559 | else if (!poll->done) /* actually waiting for an event */ | |
5560 | io_poll_req_insert(req); | |
79ebeaee | 5561 | spin_unlock_irq(&poll->head->lock); |
d7718a9d JA |
5562 | } |
5563 | ||
5564 | return mask; | |
5565 | } | |
5566 | ||
59b735ae OL |
5567 | enum { |
5568 | IO_APOLL_OK, | |
5569 | IO_APOLL_ABORTED, | |
5570 | IO_APOLL_READY | |
5571 | }; | |
5572 | ||
5573 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5574 | { |
5575 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5576 | struct io_ring_ctx *ctx = req->ctx; | |
5577 | struct async_poll *apoll; | |
5578 | struct io_poll_table ipt; | |
b2d9c3da | 5579 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5580 | int rw; |
d7718a9d JA |
5581 | |
5582 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5583 | return IO_APOLL_ABORTED; |
24c74678 | 5584 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5585 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5586 | if (!def->pollin && !def->pollout) |
5587 | return IO_APOLL_ABORTED; | |
5588 | ||
5589 | if (def->pollin) { | |
9dab14b8 | 5590 | rw = READ; |
b2d9c3da PB |
5591 | mask |= POLLIN | POLLRDNORM; |
5592 | ||
5593 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5594 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5595 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5596 | mask &= ~POLLIN; | |
5597 | } else { | |
9dab14b8 | 5598 | rw = WRITE; |
b2d9c3da PB |
5599 | mask |= POLLOUT | POLLWRNORM; |
5600 | } | |
5601 | ||
9dab14b8 | 5602 | /* if we can't nonblock try, then no point in arming a poll handler */ |
b191e2df | 5603 | if (!io_file_supports_nowait(req, rw)) |
59b735ae | 5604 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5605 | |
5606 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5607 | if (unlikely(!apoll)) | |
59b735ae | 5608 | return IO_APOLL_ABORTED; |
807abcb0 | 5609 | apoll->double_poll = NULL; |
d7718a9d | 5610 | req->apoll = apoll; |
b2d9c3da | 5611 | req->flags |= REQ_F_POLLED; |
d7718a9d | 5612 | ipt.pt._qproc = io_async_queue_proc; |
48dcd38d | 5613 | io_req_set_refcount(req); |
d7718a9d JA |
5614 | |
5615 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5616 | io_async_wake); | |
79ebeaee | 5617 | spin_unlock(&ctx->completion_lock); |
41a5169c HX |
5618 | if (ret || ipt.error) |
5619 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5620 | ||
236daeae OL |
5621 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5622 | mask, apoll->poll.events); | |
59b735ae | 5623 | return IO_APOLL_OK; |
d7718a9d JA |
5624 | } |
5625 | ||
5626 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5627 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5628 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5629 | { |
b41e9852 | 5630 | bool do_complete = false; |
221c5eb2 | 5631 | |
5082620f JA |
5632 | if (!poll->head) |
5633 | return false; | |
79ebeaee | 5634 | spin_lock_irq(&poll->head->lock); |
b2e720ac JA |
5635 | if (do_cancel) |
5636 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5637 | if (!list_empty(&poll->wait.entry)) { |
5638 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5639 | do_complete = true; |
221c5eb2 | 5640 | } |
79ebeaee | 5641 | spin_unlock_irq(&poll->head->lock); |
3bfa5bcb | 5642 | hash_del(&req->hash_node); |
d7718a9d JA |
5643 | return do_complete; |
5644 | } | |
5645 | ||
5d709043 | 5646 | static bool io_poll_remove_one(struct io_kiocb *req) |
e07785b0 | 5647 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5648 | { |
5649 | bool do_complete; | |
5650 | ||
d4e7cd36 | 5651 | io_poll_remove_double(req); |
e31001a3 | 5652 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5653 | |
b41e9852 | 5654 | if (do_complete) { |
d4d19c19 | 5655 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5656 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5657 | req_set_fail(req); |
91c2f697 | 5658 | io_put_req_deferred(req); |
5d709043 | 5659 | } |
b41e9852 | 5660 | return do_complete; |
221c5eb2 JA |
5661 | } |
5662 | ||
76e1b642 JA |
5663 | /* |
5664 | * Returns true if we found and killed one or more poll requests | |
5665 | */ | |
c072481d PB |
5666 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
5667 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 5668 | { |
78076bb6 | 5669 | struct hlist_node *tmp; |
221c5eb2 | 5670 | struct io_kiocb *req; |
8e2e1faf | 5671 | int posted = 0, i; |
221c5eb2 | 5672 | |
79ebeaee | 5673 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5674 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5675 | struct hlist_head *list; | |
5676 | ||
5677 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5678 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5679 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5680 | posted += io_poll_remove_one(req); |
5681 | } | |
221c5eb2 | 5682 | } |
79ebeaee | 5683 | spin_unlock(&ctx->completion_lock); |
b41e9852 | 5684 | |
8e2e1faf JA |
5685 | if (posted) |
5686 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5687 | |
5688 | return posted != 0; | |
221c5eb2 JA |
5689 | } |
5690 | ||
9ba5fac8 PB |
5691 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5692 | bool poll_only) | |
e07785b0 | 5693 | __must_hold(&ctx->completion_lock) |
47f46768 | 5694 | { |
78076bb6 | 5695 | struct hlist_head *list; |
47f46768 JA |
5696 | struct io_kiocb *req; |
5697 | ||
78076bb6 JA |
5698 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5699 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5700 | if (sqe_addr != req->user_data) |
5701 | continue; | |
9ba5fac8 PB |
5702 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5703 | continue; | |
b2cb805f | 5704 | return req; |
47f46768 | 5705 | } |
b2cb805f JA |
5706 | return NULL; |
5707 | } | |
5708 | ||
9ba5fac8 PB |
5709 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5710 | bool poll_only) | |
e07785b0 | 5711 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5712 | { |
5713 | struct io_kiocb *req; | |
5714 | ||
9ba5fac8 | 5715 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5716 | if (!req) |
5717 | return -ENOENT; | |
5718 | if (io_poll_remove_one(req)) | |
5719 | return 0; | |
5720 | ||
5721 | return -EALREADY; | |
47f46768 JA |
5722 | } |
5723 | ||
9096af3e PB |
5724 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5725 | unsigned int flags) | |
5726 | { | |
5727 | u32 events; | |
47f46768 | 5728 | |
9096af3e PB |
5729 | events = READ_ONCE(sqe->poll32_events); |
5730 | #ifdef __BIG_ENDIAN | |
5731 | events = swahw32(events); | |
5732 | #endif | |
5733 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5734 | events |= EPOLLONESHOT; | |
5735 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5736 | } |
5737 | ||
c5de0036 | 5738 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5739 | const struct io_uring_sqe *sqe) |
0969e783 | 5740 | { |
c5de0036 PB |
5741 | struct io_poll_update *upd = &req->poll_update; |
5742 | u32 flags; | |
5743 | ||
0969e783 JA |
5744 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5745 | return -EINVAL; | |
26578cda | 5746 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5747 | return -EINVAL; |
5748 | flags = READ_ONCE(sqe->len); | |
5749 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5750 | IORING_POLL_ADD_MULTI)) | |
5751 | return -EINVAL; | |
5752 | /* meaningless without update */ | |
5753 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5754 | return -EINVAL; |
5755 | ||
c5de0036 PB |
5756 | upd->old_user_data = READ_ONCE(sqe->addr); |
5757 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5758 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5759 | |
c5de0036 PB |
5760 | upd->new_user_data = READ_ONCE(sqe->off); |
5761 | if (!upd->update_user_data && upd->new_user_data) | |
5762 | return -EINVAL; | |
5763 | if (upd->update_events) | |
5764 | upd->events = io_poll_parse_events(sqe, flags); | |
5765 | else if (sqe->poll32_events) | |
5766 | return -EINVAL; | |
221c5eb2 | 5767 | |
221c5eb2 JA |
5768 | return 0; |
5769 | } | |
5770 | ||
221c5eb2 JA |
5771 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5772 | void *key) | |
5773 | { | |
c2f2eb7d JA |
5774 | struct io_kiocb *req = wait->private; |
5775 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5776 | |
d7718a9d | 5777 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5778 | } |
5779 | ||
221c5eb2 JA |
5780 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5781 | struct poll_table_struct *p) | |
5782 | { | |
5783 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5784 | ||
e8c2bc1f | 5785 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5786 | } |
5787 | ||
3529d8c2 | 5788 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5789 | { |
5790 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5791 | u32 flags; |
221c5eb2 JA |
5792 | |
5793 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5794 | return -EINVAL; | |
c5de0036 | 5795 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5796 | return -EINVAL; |
5797 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5798 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5799 | return -EINVAL; |
5800 | ||
48dcd38d | 5801 | io_req_set_refcount(req); |
c5de0036 | 5802 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5803 | return 0; |
5804 | } | |
5805 | ||
61e98203 | 5806 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5807 | { |
5808 | struct io_poll_iocb *poll = &req->poll; | |
5809 | struct io_ring_ctx *ctx = req->ctx; | |
5810 | struct io_poll_table ipt; | |
0969e783 | 5811 | __poll_t mask; |
5b7aa38d | 5812 | bool done; |
0969e783 | 5813 | |
d7718a9d | 5814 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5815 | |
d7718a9d JA |
5816 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5817 | io_poll_wake); | |
221c5eb2 | 5818 | |
8c838788 | 5819 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5820 | ipt.error = 0; |
eb6e6f06 PB |
5821 | done = __io_poll_complete(req, mask); |
5822 | io_commit_cqring(req->ctx); | |
221c5eb2 | 5823 | } |
79ebeaee | 5824 | spin_unlock(&ctx->completion_lock); |
221c5eb2 | 5825 | |
8c838788 JA |
5826 | if (mask) { |
5827 | io_cqring_ev_posted(ctx); | |
5b7aa38d | 5828 | if (done) |
88e41cf9 | 5829 | io_put_req(req); |
221c5eb2 | 5830 | } |
8c838788 | 5831 | return ipt.error; |
221c5eb2 JA |
5832 | } |
5833 | ||
c5de0036 | 5834 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5835 | { |
5836 | struct io_ring_ctx *ctx = req->ctx; | |
5837 | struct io_kiocb *preq; | |
cb3b200e | 5838 | bool completing; |
b69de288 JA |
5839 | int ret; |
5840 | ||
79ebeaee | 5841 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5842 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5843 | if (!preq) { |
5844 | ret = -ENOENT; | |
5845 | goto err; | |
b69de288 | 5846 | } |
cb3b200e | 5847 | |
c5de0036 PB |
5848 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5849 | completing = true; | |
5850 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5851 | goto err; | |
5852 | } | |
5853 | ||
cb3b200e JA |
5854 | /* |
5855 | * Don't allow racy completion with singleshot, as we cannot safely | |
5856 | * update those. For multishot, if we're racing with completion, just | |
5857 | * let completion re-add it. | |
5858 | */ | |
5859 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5860 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5861 | ret = -EALREADY; | |
5862 | goto err; | |
b69de288 JA |
5863 | } |
5864 | /* we now have a detached poll request. reissue. */ | |
5865 | ret = 0; | |
5866 | err: | |
b69de288 | 5867 | if (ret < 0) { |
79ebeaee | 5868 | spin_unlock(&ctx->completion_lock); |
93d2bcd2 | 5869 | req_set_fail(req); |
b69de288 JA |
5870 | io_req_complete(req, ret); |
5871 | return 0; | |
5872 | } | |
5873 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5874 | if (req->poll_update.update_events) { |
b69de288 | 5875 | preq->poll.events &= ~0xffff; |
9d805892 | 5876 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5877 | preq->poll.events |= IO_POLL_UNMASK; |
5878 | } | |
9d805892 PB |
5879 | if (req->poll_update.update_user_data) |
5880 | preq->user_data = req->poll_update.new_user_data; | |
79ebeaee | 5881 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5882 | |
b69de288 JA |
5883 | /* complete update request, we're done with it */ |
5884 | io_req_complete(req, ret); | |
5885 | ||
cb3b200e | 5886 | if (!completing) { |
c5de0036 | 5887 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5888 | if (ret < 0) { |
93d2bcd2 | 5889 | req_set_fail(preq); |
cb3b200e JA |
5890 | io_req_complete(preq, ret); |
5891 | } | |
b69de288 JA |
5892 | } |
5893 | return 0; | |
5894 | } | |
5895 | ||
f237c30a | 5896 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
89850fce | 5897 | { |
6224590d PB |
5898 | struct io_timeout_data *data = req->async_data; |
5899 | ||
5900 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) | |
5901 | req_set_fail(req); | |
505657bc | 5902 | io_req_complete_post(req, -ETIME, 0); |
89850fce JA |
5903 | } |
5904 | ||
5262f567 JA |
5905 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5906 | { | |
ad8a48ac JA |
5907 | struct io_timeout_data *data = container_of(timer, |
5908 | struct io_timeout_data, timer); | |
5909 | struct io_kiocb *req = data->req; | |
5910 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5911 | unsigned long flags; |
5912 | ||
89850fce | 5913 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5914 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5915 | atomic_set(&req->ctx->cq_timeouts, |
5916 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5917 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5918 | |
89850fce JA |
5919 | req->io_task_work.func = io_req_task_timeout; |
5920 | io_req_task_work_add(req); | |
5262f567 JA |
5921 | return HRTIMER_NORESTART; |
5922 | } | |
5923 | ||
fbd15848 PB |
5924 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5925 | __u64 user_data) | |
89850fce | 5926 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5927 | { |
fbd15848 | 5928 | struct io_timeout_data *io; |
47f46768 | 5929 | struct io_kiocb *req; |
fd9c7bc5 | 5930 | bool found = false; |
f254ac04 | 5931 | |
135fcde8 | 5932 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5933 | found = user_data == req->user_data; |
5934 | if (found) | |
47f46768 | 5935 | break; |
47f46768 | 5936 | } |
fd9c7bc5 PB |
5937 | if (!found) |
5938 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5939 | |
5940 | io = req->async_data; | |
fd9c7bc5 | 5941 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5942 | return ERR_PTR(-EALREADY); |
a71976f3 | 5943 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5944 | return req; |
5945 | } | |
47f46768 | 5946 | |
fbd15848 | 5947 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 5948 | __must_hold(&ctx->completion_lock) |
89850fce | 5949 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
5950 | { |
5951 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5952 | ||
5953 | if (IS_ERR(req)) | |
5954 | return PTR_ERR(req); | |
f254ac04 | 5955 | |
93d2bcd2 | 5956 | req_set_fail(req); |
d4d19c19 | 5957 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
91c2f697 | 5958 | io_put_req_deferred(req); |
f254ac04 JA |
5959 | return 0; |
5960 | } | |
5961 | ||
50c1df2b JA |
5962 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
5963 | { | |
5964 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
5965 | case IORING_TIMEOUT_BOOTTIME: | |
5966 | return CLOCK_BOOTTIME; | |
5967 | case IORING_TIMEOUT_REALTIME: | |
5968 | return CLOCK_REALTIME; | |
5969 | default: | |
5970 | /* can't happen, vetted at prep time */ | |
5971 | WARN_ON_ONCE(1); | |
5972 | fallthrough; | |
5973 | case 0: | |
5974 | return CLOCK_MONOTONIC; | |
5975 | } | |
5976 | } | |
5977 | ||
f1042b6c PB |
5978 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5979 | struct timespec64 *ts, enum hrtimer_mode mode) | |
5980 | __must_hold(&ctx->timeout_lock) | |
5981 | { | |
5982 | struct io_timeout_data *io; | |
5983 | struct io_kiocb *req; | |
5984 | bool found = false; | |
5985 | ||
5986 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
5987 | found = user_data == req->user_data; | |
5988 | if (found) | |
5989 | break; | |
5990 | } | |
5991 | if (!found) | |
5992 | return -ENOENT; | |
5993 | ||
5994 | io = req->async_data; | |
5995 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
5996 | return -EALREADY; | |
5997 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
5998 | io->timer.function = io_link_timeout_fn; | |
5999 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
6000 | return 0; | |
6001 | } | |
6002 | ||
9c8e11b3 PB |
6003 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6004 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 6005 | __must_hold(&ctx->timeout_lock) |
47f46768 | 6006 | { |
9c8e11b3 PB |
6007 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
6008 | struct io_timeout_data *data; | |
47f46768 | 6009 | |
9c8e11b3 PB |
6010 | if (IS_ERR(req)) |
6011 | return PTR_ERR(req); | |
47f46768 | 6012 | |
9c8e11b3 PB |
6013 | req->timeout.off = 0; /* noseq */ |
6014 | data = req->async_data; | |
6015 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6016 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6017 | data->timer.function = io_timeout_fn; |
6018 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6019 | return 0; | |
47f46768 JA |
6020 | } |
6021 | ||
3529d8c2 JA |
6022 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6023 | const struct io_uring_sqe *sqe) | |
b29472ee | 6024 | { |
9c8e11b3 PB |
6025 | struct io_timeout_rem *tr = &req->timeout_rem; |
6026 | ||
b29472ee JA |
6027 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6028 | return -EINVAL; | |
61710e43 DA |
6029 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6030 | return -EINVAL; | |
26578cda | 6031 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6032 | return -EINVAL; |
6033 | ||
f1042b6c | 6034 | tr->ltimeout = false; |
9c8e11b3 PB |
6035 | tr->addr = READ_ONCE(sqe->addr); |
6036 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6037 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6038 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6039 | return -EINVAL; | |
6040 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6041 | tr->ltimeout = true; | |
6042 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6043 | return -EINVAL; |
6044 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6045 | return -EFAULT; | |
6046 | } else if (tr->flags) { | |
6047 | /* timeout removal doesn't support flags */ | |
b29472ee | 6048 | return -EINVAL; |
9c8e11b3 | 6049 | } |
b29472ee | 6050 | |
b29472ee JA |
6051 | return 0; |
6052 | } | |
6053 | ||
8662daec PB |
6054 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6055 | { | |
6056 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6057 | : HRTIMER_MODE_REL; | |
6058 | } | |
6059 | ||
11365043 JA |
6060 | /* |
6061 | * Remove or update an existing timeout command | |
6062 | */ | |
61e98203 | 6063 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6064 | { |
9c8e11b3 | 6065 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6066 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6067 | int ret; |
11365043 | 6068 | |
ec3c3d0f PB |
6069 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6070 | spin_lock(&ctx->completion_lock); | |
6071 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6072 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6073 | spin_unlock_irq(&ctx->timeout_lock); |
6074 | spin_unlock(&ctx->completion_lock); | |
6075 | } else { | |
f1042b6c PB |
6076 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6077 | ||
ec3c3d0f | 6078 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6079 | if (tr->ltimeout) |
6080 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6081 | else | |
6082 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6083 | spin_unlock_irq(&ctx->timeout_lock); |
6084 | } | |
11365043 | 6085 | |
4e88d6e7 | 6086 | if (ret < 0) |
93d2bcd2 | 6087 | req_set_fail(req); |
505657bc | 6088 | io_req_complete_post(req, ret, 0); |
11365043 | 6089 | return 0; |
5262f567 JA |
6090 | } |
6091 | ||
3529d8c2 | 6092 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6093 | bool is_timeout_link) |
5262f567 | 6094 | { |
ad8a48ac | 6095 | struct io_timeout_data *data; |
a41525ab | 6096 | unsigned flags; |
56080b02 | 6097 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6098 | |
ad8a48ac | 6099 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6100 | return -EINVAL; |
26578cda PB |
6101 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6102 | sqe->splice_fd_in) | |
a41525ab | 6103 | return -EINVAL; |
56080b02 | 6104 | if (off && is_timeout_link) |
2d28390a | 6105 | return -EINVAL; |
a41525ab | 6106 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
6107 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
6108 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
6109 | return -EINVAL; |
6110 | /* more than one clock specified is invalid, obviously */ | |
6111 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6112 | return -EINVAL; |
bdf20073 | 6113 | |
ef9dd637 | 6114 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6115 | req->timeout.off = off; |
f18ee4cf PB |
6116 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6117 | req->ctx->off_timeout_used = true; | |
26a61679 | 6118 | |
d886e185 | 6119 | if (!req_has_async_data(req) && io_alloc_async_data(req)) |
26a61679 JA |
6120 | return -ENOMEM; |
6121 | ||
e8c2bc1f | 6122 | data = req->async_data; |
ad8a48ac | 6123 | data->req = req; |
50c1df2b | 6124 | data->flags = flags; |
ad8a48ac JA |
6125 | |
6126 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6127 | return -EFAULT; |
6128 | ||
8662daec | 6129 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6130 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6131 | |
6132 | if (is_timeout_link) { | |
6133 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6134 | ||
6135 | if (!link->head) | |
6136 | return -EINVAL; | |
6137 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6138 | return -EINVAL; | |
4d13d1a4 PB |
6139 | req->timeout.head = link->last; |
6140 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6141 | } |
ad8a48ac JA |
6142 | return 0; |
6143 | } | |
6144 | ||
61e98203 | 6145 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6146 | { |
ad8a48ac | 6147 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6148 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6149 | struct list_head *entry; |
bfe68a22 | 6150 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6151 | |
89850fce | 6152 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6153 | |
5262f567 JA |
6154 | /* |
6155 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6156 | * timeout event to be satisfied. If it isn't set, then this is |
6157 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6158 | */ |
8eb7e2d0 | 6159 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6160 | entry = ctx->timeout_list.prev; |
6161 | goto add; | |
6162 | } | |
5262f567 | 6163 | |
bfe68a22 PB |
6164 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6165 | req->timeout.target_seq = tail + off; | |
5262f567 | 6166 | |
f010505b MDG |
6167 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6168 | * This is safe because ->completion_lock is held, and submissions | |
6169 | * and completions are never mixed in the same ->completion_lock section. | |
6170 | */ | |
6171 | ctx->cq_last_tm_flush = tail; | |
6172 | ||
5262f567 JA |
6173 | /* |
6174 | * Insertion sort, ensuring the first entry in the list is always | |
6175 | * the one we need first. | |
6176 | */ | |
5262f567 | 6177 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6178 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6179 | timeout.list); | |
5262f567 | 6180 | |
8eb7e2d0 | 6181 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6182 | continue; |
bfe68a22 PB |
6183 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6184 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6185 | break; |
6186 | } | |
93bd25bb | 6187 | add: |
135fcde8 | 6188 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6189 | data->timer.function = io_timeout_fn; |
6190 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6191 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6192 | return 0; |
6193 | } | |
5262f567 | 6194 | |
f458dd84 PB |
6195 | struct io_cancel_data { |
6196 | struct io_ring_ctx *ctx; | |
6197 | u64 user_data; | |
6198 | }; | |
6199 | ||
62755e35 JA |
6200 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6201 | { | |
6202 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6203 | struct io_cancel_data *cd = data; |
62755e35 | 6204 | |
f458dd84 | 6205 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6206 | } |
6207 | ||
f458dd84 PB |
6208 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6209 | struct io_ring_ctx *ctx) | |
62755e35 | 6210 | { |
f458dd84 | 6211 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6212 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6213 | int ret = 0; |
6214 | ||
f458dd84 | 6215 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6216 | return -ENOENT; |
6217 | ||
f458dd84 | 6218 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6219 | switch (cancel_ret) { |
6220 | case IO_WQ_CANCEL_OK: | |
6221 | ret = 0; | |
6222 | break; | |
6223 | case IO_WQ_CANCEL_RUNNING: | |
6224 | ret = -EALREADY; | |
6225 | break; | |
6226 | case IO_WQ_CANCEL_NOTFOUND: | |
6227 | ret = -ENOENT; | |
6228 | break; | |
6229 | } | |
6230 | ||
e977d6d3 JA |
6231 | return ret; |
6232 | } | |
6233 | ||
8cb01fac | 6234 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6235 | { |
8cb01fac | 6236 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6237 | int ret; |
6238 | ||
dadebc35 | 6239 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6240 | |
f458dd84 | 6241 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6242 | if (ret != -ENOENT) |
8cb01fac | 6243 | return ret; |
505657bc PB |
6244 | |
6245 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6246 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6247 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6248 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6249 | if (ret != -ENOENT) |
505657bc PB |
6250 | goto out; |
6251 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6252 | out: | |
6253 | spin_unlock(&ctx->completion_lock); | |
6254 | return ret; | |
47f46768 JA |
6255 | } |
6256 | ||
3529d8c2 JA |
6257 | static int io_async_cancel_prep(struct io_kiocb *req, |
6258 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6259 | { |
fbf23849 | 6260 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6261 | return -EINVAL; |
61710e43 DA |
6262 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6263 | return -EINVAL; | |
26578cda PB |
6264 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6265 | sqe->splice_fd_in) | |
e977d6d3 JA |
6266 | return -EINVAL; |
6267 | ||
fbf23849 JA |
6268 | req->cancel.addr = READ_ONCE(sqe->addr); |
6269 | return 0; | |
6270 | } | |
6271 | ||
61e98203 | 6272 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6273 | { |
6274 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
6275 | u64 sqe_addr = req->cancel.addr; |
6276 | struct io_tctx_node *node; | |
6277 | int ret; | |
6278 | ||
8cb01fac | 6279 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6280 | if (ret != -ENOENT) |
6281 | goto done; | |
58f99373 PB |
6282 | |
6283 | /* slow path, try all io-wq's */ | |
6284 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
6285 | ret = -ENOENT; | |
6286 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6287 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6288 | |
58f99373 PB |
6289 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6290 | if (ret != -ENOENT) | |
6291 | break; | |
6292 | } | |
6293 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
58f99373 | 6294 | done: |
58f99373 | 6295 | if (ret < 0) |
93d2bcd2 | 6296 | req_set_fail(req); |
505657bc | 6297 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6298 | return 0; |
6299 | } | |
6300 | ||
269bbe5f | 6301 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6302 | const struct io_uring_sqe *sqe) |
6303 | { | |
61710e43 DA |
6304 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6305 | return -EINVAL; | |
26578cda | 6306 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6307 | return -EINVAL; |
6308 | ||
269bbe5f BM |
6309 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6310 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6311 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6312 | return -EINVAL; |
269bbe5f | 6313 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6314 | return 0; |
6315 | } | |
6316 | ||
889fca73 | 6317 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6318 | { |
6319 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 6320 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6321 | int ret; |
fbf23849 | 6322 | |
269bbe5f BM |
6323 | up.offset = req->rsrc_update.offset; |
6324 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6325 | up.nr = 0; |
6326 | up.tags = 0; | |
615cee49 | 6327 | up.resv = 0; |
05f3fb3c | 6328 | |
cdb31c29 | 6329 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
fdecb662 | 6330 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6331 | &up, req->rsrc_update.nr_args); |
cdb31c29 | 6332 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
05f3fb3c JA |
6333 | |
6334 | if (ret < 0) | |
93d2bcd2 | 6335 | req_set_fail(req); |
889fca73 | 6336 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6337 | return 0; |
6338 | } | |
6339 | ||
bfe76559 | 6340 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6341 | { |
d625c6ee | 6342 | switch (req->opcode) { |
e781573e | 6343 | case IORING_OP_NOP: |
bfe76559 | 6344 | return 0; |
f67676d1 JA |
6345 | case IORING_OP_READV: |
6346 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6347 | case IORING_OP_READ: |
bfe76559 | 6348 | return io_read_prep(req, sqe); |
f67676d1 JA |
6349 | case IORING_OP_WRITEV: |
6350 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6351 | case IORING_OP_WRITE: |
bfe76559 | 6352 | return io_write_prep(req, sqe); |
0969e783 | 6353 | case IORING_OP_POLL_ADD: |
bfe76559 | 6354 | return io_poll_add_prep(req, sqe); |
0969e783 | 6355 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6356 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6357 | case IORING_OP_FSYNC: |
1155c76a | 6358 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6359 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6360 | return io_sfr_prep(req, sqe); |
03b1230c | 6361 | case IORING_OP_SENDMSG: |
fddaface | 6362 | case IORING_OP_SEND: |
bfe76559 | 6363 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6364 | case IORING_OP_RECVMSG: |
fddaface | 6365 | case IORING_OP_RECV: |
bfe76559 | 6366 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6367 | case IORING_OP_CONNECT: |
bfe76559 | 6368 | return io_connect_prep(req, sqe); |
2d28390a | 6369 | case IORING_OP_TIMEOUT: |
bfe76559 | 6370 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6371 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6372 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6373 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6374 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6375 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6376 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6377 | case IORING_OP_ACCEPT: |
bfe76559 | 6378 | return io_accept_prep(req, sqe); |
d63d1b5e | 6379 | case IORING_OP_FALLOCATE: |
bfe76559 | 6380 | return io_fallocate_prep(req, sqe); |
15b71abe | 6381 | case IORING_OP_OPENAT: |
bfe76559 | 6382 | return io_openat_prep(req, sqe); |
b5dba59e | 6383 | case IORING_OP_CLOSE: |
bfe76559 | 6384 | return io_close_prep(req, sqe); |
05f3fb3c | 6385 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6386 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6387 | case IORING_OP_STATX: |
bfe76559 | 6388 | return io_statx_prep(req, sqe); |
4840e418 | 6389 | case IORING_OP_FADVISE: |
bfe76559 | 6390 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6391 | case IORING_OP_MADVISE: |
bfe76559 | 6392 | return io_madvise_prep(req, sqe); |
cebdb986 | 6393 | case IORING_OP_OPENAT2: |
bfe76559 | 6394 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6395 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6396 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6397 | case IORING_OP_SPLICE: |
bfe76559 | 6398 | return io_splice_prep(req, sqe); |
ddf0322d | 6399 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6400 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6401 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6402 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6403 | case IORING_OP_TEE: |
bfe76559 | 6404 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6405 | case IORING_OP_SHUTDOWN: |
6406 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6407 | case IORING_OP_RENAMEAT: |
6408 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6409 | case IORING_OP_UNLINKAT: |
6410 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6411 | case IORING_OP_MKDIRAT: |
6412 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6413 | case IORING_OP_SYMLINKAT: |
6414 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6415 | case IORING_OP_LINKAT: |
6416 | return io_linkat_prep(req, sqe); | |
f67676d1 JA |
6417 | } |
6418 | ||
bfe76559 PB |
6419 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6420 | req->opcode); | |
bd54b6fe | 6421 | return -EINVAL; |
bfe76559 PB |
6422 | } |
6423 | ||
93642ef8 | 6424 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6425 | { |
b7e298d2 PB |
6426 | if (!io_op_defs[req->opcode].needs_async_setup) |
6427 | return 0; | |
d886e185 | 6428 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
6429 | return -EFAULT; |
6430 | if (io_alloc_async_data(req)) | |
6431 | return -EAGAIN; | |
6432 | ||
93642ef8 PB |
6433 | switch (req->opcode) { |
6434 | case IORING_OP_READV: | |
93642ef8 PB |
6435 | return io_rw_prep_async(req, READ); |
6436 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6437 | return io_rw_prep_async(req, WRITE); |
6438 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6439 | return io_sendmsg_prep_async(req); |
6440 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6441 | return io_recvmsg_prep_async(req); |
6442 | case IORING_OP_CONNECT: | |
6443 | return io_connect_prep_async(req); | |
6444 | } | |
b7e298d2 PB |
6445 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6446 | req->opcode); | |
6447 | return -EFAULT; | |
f67676d1 JA |
6448 | } |
6449 | ||
9cf7c104 PB |
6450 | static u32 io_get_sequence(struct io_kiocb *req) |
6451 | { | |
a3dbdf54 | 6452 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6453 | |
a3dbdf54 PB |
6454 | /* need original cached_sq_head, but it was increased for each req */ |
6455 | io_for_each_link(req, req) | |
6456 | seq--; | |
6457 | return seq; | |
9cf7c104 PB |
6458 | } |
6459 | ||
c072481d | 6460 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 6461 | { |
a197f664 | 6462 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6463 | struct io_defer_entry *de; |
f67676d1 | 6464 | int ret; |
e0eb71dc | 6465 | u32 seq = io_get_sequence(req); |
de0617e4 | 6466 | |
9d858b21 | 6467 | /* Still need defer if there is pending req in defer list. */ |
5e371265 | 6468 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e0eb71dc | 6469 | queue: |
5e371265 | 6470 | ctx->drain_active = false; |
e0eb71dc PB |
6471 | io_req_task_queue(req); |
6472 | return; | |
5e371265 | 6473 | } |
de0617e4 | 6474 | |
b7e298d2 | 6475 | ret = io_req_prep_async(req); |
e0eb71dc PB |
6476 | if (ret) { |
6477 | fail: | |
6478 | io_req_complete_failed(req, ret); | |
6479 | return; | |
6480 | } | |
cbdcb435 | 6481 | io_prep_async_link(req); |
27dc8338 | 6482 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6483 | if (!de) { |
1b48773f | 6484 | ret = -ENOMEM; |
e0eb71dc | 6485 | goto fail; |
76cc33d7 | 6486 | } |
2d28390a | 6487 | |
79ebeaee | 6488 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6489 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6490 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6491 | kfree(de); |
e0eb71dc | 6492 | goto queue; |
de0617e4 JA |
6493 | } |
6494 | ||
915967f6 | 6495 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6496 | de->req = req; |
9cf7c104 | 6497 | de->seq = seq; |
27dc8338 | 6498 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6499 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
6500 | } |
6501 | ||
68fb8979 | 6502 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6503 | { |
0e1b6fe3 | 6504 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 PB |
6505 | kfree(req->kbuf); |
6506 | req->kbuf = NULL; | |
99bc4c38 PB |
6507 | } |
6508 | ||
0e1b6fe3 PB |
6509 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6510 | switch (req->opcode) { | |
6511 | case IORING_OP_READV: | |
6512 | case IORING_OP_READ_FIXED: | |
6513 | case IORING_OP_READ: | |
6514 | case IORING_OP_WRITEV: | |
6515 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6516 | case IORING_OP_WRITE: { |
6517 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6518 | |
6519 | kfree(io->free_iovec); | |
0e1b6fe3 | 6520 | break; |
e8c2bc1f | 6521 | } |
0e1b6fe3 | 6522 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6523 | case IORING_OP_SENDMSG: { |
6524 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6525 | |
6526 | kfree(io->free_iov); | |
0e1b6fe3 | 6527 | break; |
e8c2bc1f | 6528 | } |
0e1b6fe3 PB |
6529 | case IORING_OP_SPLICE: |
6530 | case IORING_OP_TEE: | |
e1d767f0 PB |
6531 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6532 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6533 | break; |
f3cd4850 JA |
6534 | case IORING_OP_OPENAT: |
6535 | case IORING_OP_OPENAT2: | |
6536 | if (req->open.filename) | |
6537 | putname(req->open.filename); | |
6538 | break; | |
80a261fd JA |
6539 | case IORING_OP_RENAMEAT: |
6540 | putname(req->rename.oldpath); | |
6541 | putname(req->rename.newpath); | |
6542 | break; | |
14a1143b JA |
6543 | case IORING_OP_UNLINKAT: |
6544 | putname(req->unlink.filename); | |
6545 | break; | |
e34a02dc DK |
6546 | case IORING_OP_MKDIRAT: |
6547 | putname(req->mkdir.filename); | |
6548 | break; | |
7a8721f8 DK |
6549 | case IORING_OP_SYMLINKAT: |
6550 | putname(req->symlink.oldpath); | |
6551 | putname(req->symlink.newpath); | |
6552 | break; | |
cf30da90 DK |
6553 | case IORING_OP_LINKAT: |
6554 | putname(req->hardlink.oldpath); | |
6555 | putname(req->hardlink.newpath); | |
6556 | break; | |
0e1b6fe3 | 6557 | } |
99bc4c38 | 6558 | } |
75652a30 JA |
6559 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6560 | kfree(req->apoll->double_poll); | |
6561 | kfree(req->apoll); | |
6562 | req->apoll = NULL; | |
6563 | } | |
3a0a6902 PB |
6564 | if (req->flags & REQ_F_INFLIGHT) { |
6565 | struct io_uring_task *tctx = req->task->io_uring; | |
6566 | ||
6567 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6568 | } |
c854357b | 6569 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6570 | put_cred(req->creds); |
d886e185 PB |
6571 | if (req->flags & REQ_F_ASYNC_DATA) { |
6572 | kfree(req->async_data); | |
6573 | req->async_data = NULL; | |
6574 | } | |
c854357b | 6575 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
6576 | } |
6577 | ||
889fca73 | 6578 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6579 | { |
a197f664 | 6580 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6581 | const struct cred *creds = NULL; |
d625c6ee | 6582 | int ret; |
2b188cc1 | 6583 | |
6878b40e | 6584 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 6585 | creds = override_creds(req->creds); |
5730b27e | 6586 | |
d625c6ee | 6587 | switch (req->opcode) { |
2b188cc1 | 6588 | case IORING_OP_NOP: |
889fca73 | 6589 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6590 | break; |
6591 | case IORING_OP_READV: | |
edafccee | 6592 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6593 | case IORING_OP_READ: |
889fca73 | 6594 | ret = io_read(req, issue_flags); |
edafccee | 6595 | break; |
3529d8c2 | 6596 | case IORING_OP_WRITEV: |
edafccee | 6597 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6598 | case IORING_OP_WRITE: |
889fca73 | 6599 | ret = io_write(req, issue_flags); |
2b188cc1 | 6600 | break; |
c992fe29 | 6601 | case IORING_OP_FSYNC: |
45d189c6 | 6602 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6603 | break; |
221c5eb2 | 6604 | case IORING_OP_POLL_ADD: |
61e98203 | 6605 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6606 | break; |
6607 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6608 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6609 | break; |
5d17b4a4 | 6610 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6611 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6612 | break; |
0fa03c62 | 6613 | case IORING_OP_SENDMSG: |
889fca73 | 6614 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6615 | break; |
fddaface | 6616 | case IORING_OP_SEND: |
889fca73 | 6617 | ret = io_send(req, issue_flags); |
0fa03c62 | 6618 | break; |
aa1fa28f | 6619 | case IORING_OP_RECVMSG: |
889fca73 | 6620 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6621 | break; |
fddaface | 6622 | case IORING_OP_RECV: |
889fca73 | 6623 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6624 | break; |
5262f567 | 6625 | case IORING_OP_TIMEOUT: |
61e98203 | 6626 | ret = io_timeout(req, issue_flags); |
5262f567 | 6627 | break; |
11365043 | 6628 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6629 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6630 | break; |
17f2fe35 | 6631 | case IORING_OP_ACCEPT: |
889fca73 | 6632 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6633 | break; |
f8e85cf2 | 6634 | case IORING_OP_CONNECT: |
889fca73 | 6635 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6636 | break; |
62755e35 | 6637 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6638 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6639 | break; |
d63d1b5e | 6640 | case IORING_OP_FALLOCATE: |
45d189c6 | 6641 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6642 | break; |
15b71abe | 6643 | case IORING_OP_OPENAT: |
45d189c6 | 6644 | ret = io_openat(req, issue_flags); |
15b71abe | 6645 | break; |
b5dba59e | 6646 | case IORING_OP_CLOSE: |
889fca73 | 6647 | ret = io_close(req, issue_flags); |
b5dba59e | 6648 | break; |
05f3fb3c | 6649 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6650 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6651 | break; |
eddc7ef5 | 6652 | case IORING_OP_STATX: |
45d189c6 | 6653 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6654 | break; |
4840e418 | 6655 | case IORING_OP_FADVISE: |
45d189c6 | 6656 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6657 | break; |
c1ca757b | 6658 | case IORING_OP_MADVISE: |
45d189c6 | 6659 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6660 | break; |
cebdb986 | 6661 | case IORING_OP_OPENAT2: |
45d189c6 | 6662 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6663 | break; |
3e4827b0 | 6664 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6665 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6666 | break; |
7d67af2c | 6667 | case IORING_OP_SPLICE: |
45d189c6 | 6668 | ret = io_splice(req, issue_flags); |
7d67af2c | 6669 | break; |
ddf0322d | 6670 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6671 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6672 | break; |
067524e9 | 6673 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6674 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6675 | break; |
f2a8d5c7 | 6676 | case IORING_OP_TEE: |
45d189c6 | 6677 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6678 | break; |
36f4fa68 | 6679 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6680 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6681 | break; |
80a261fd | 6682 | case IORING_OP_RENAMEAT: |
45d189c6 | 6683 | ret = io_renameat(req, issue_flags); |
80a261fd | 6684 | break; |
14a1143b | 6685 | case IORING_OP_UNLINKAT: |
45d189c6 | 6686 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6687 | break; |
e34a02dc DK |
6688 | case IORING_OP_MKDIRAT: |
6689 | ret = io_mkdirat(req, issue_flags); | |
6690 | break; | |
7a8721f8 DK |
6691 | case IORING_OP_SYMLINKAT: |
6692 | ret = io_symlinkat(req, issue_flags); | |
6693 | break; | |
cf30da90 DK |
6694 | case IORING_OP_LINKAT: |
6695 | ret = io_linkat(req, issue_flags); | |
6696 | break; | |
2b188cc1 JA |
6697 | default: |
6698 | ret = -EINVAL; | |
6699 | break; | |
6700 | } | |
6701 | ||
5730b27e JA |
6702 | if (creds) |
6703 | revert_creds(creds); | |
def596e9 JA |
6704 | if (ret) |
6705 | return ret; | |
b532576e | 6706 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6707 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6708 | io_iopoll_req_issued(req); | |
def596e9 JA |
6709 | |
6710 | return 0; | |
2b188cc1 JA |
6711 | } |
6712 | ||
ebc11b6c PB |
6713 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6714 | { | |
6715 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6716 | ||
6717 | req = io_put_req_find_next(req); | |
6718 | return req ? &req->work : NULL; | |
6719 | } | |
6720 | ||
5280f7e5 | 6721 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6722 | { |
6723 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6724 | struct io_kiocb *timeout; |
561fb04a | 6725 | int ret = 0; |
2b188cc1 | 6726 | |
48dcd38d PB |
6727 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6728 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6729 | __io_req_set_refcount(req, 2); | |
6730 | else | |
6731 | req_ref_get(req); | |
5d5901a3 | 6732 | |
6df1db6b PB |
6733 | timeout = io_prep_linked_timeout(req); |
6734 | if (timeout) | |
6735 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6736 | |
dadebc35 | 6737 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
4014d943 | 6738 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6739 | ret = -ECANCELED; |
31b51510 | 6740 | |
561fb04a | 6741 | if (!ret) { |
561fb04a | 6742 | do { |
889fca73 | 6743 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6744 | /* |
6745 | * We can get EAGAIN for polled IO even though we're | |
6746 | * forcing a sync submission from here, since we can't | |
6747 | * wait for request slots on the block side. | |
6748 | */ | |
6749 | if (ret != -EAGAIN) | |
6750 | break; | |
6751 | cond_resched(); | |
6752 | } while (1); | |
6753 | } | |
31b51510 | 6754 | |
a3df7698 | 6755 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6756 | if (ret) |
a3df7698 | 6757 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6758 | } |
6759 | ||
aeca241b | 6760 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6761 | unsigned i) |
65e19f54 | 6762 | { |
042b0d85 | 6763 | return &table->files[i]; |
dafecf19 PB |
6764 | } |
6765 | ||
65e19f54 JA |
6766 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6767 | int index) | |
6768 | { | |
aeca241b | 6769 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6770 | |
a04b0ac0 | 6771 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6772 | } |
6773 | ||
a04b0ac0 | 6774 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6775 | { |
6776 | unsigned long file_ptr = (unsigned long) file; | |
6777 | ||
b191e2df | 6778 | if (__io_file_supports_nowait(file, READ)) |
9a321c98 | 6779 | file_ptr |= FFS_ASYNC_READ; |
b191e2df | 6780 | if (__io_file_supports_nowait(file, WRITE)) |
9a321c98 PB |
6781 | file_ptr |= FFS_ASYNC_WRITE; |
6782 | if (S_ISREG(file_inode(file)->i_mode)) | |
6783 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6784 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6785 | } |
6786 | ||
ac177053 PB |
6787 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6788 | struct io_kiocb *req, int fd) | |
09bb8394 | 6789 | { |
8da11c19 | 6790 | struct file *file; |
ac177053 | 6791 | unsigned long file_ptr; |
09bb8394 | 6792 | |
ac177053 PB |
6793 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6794 | return NULL; | |
6795 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6796 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6797 | file = (struct file *) (file_ptr & FFS_MASK); | |
6798 | file_ptr &= ~FFS_MASK; | |
6799 | /* mask in overlapping REQ_F and FFS bits */ | |
b191e2df | 6800 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
a46be971 | 6801 | io_req_set_rsrc_node(req, ctx); |
ac177053 PB |
6802 | return file; |
6803 | } | |
d44f554e | 6804 | |
ac177053 | 6805 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6806 | struct io_kiocb *req, int fd) |
6807 | { | |
62906e89 | 6808 | struct file *file = fget(fd); |
ac177053 PB |
6809 | |
6810 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6811 | |
ac177053 PB |
6812 | /* we don't allow fixed io_uring files */ |
6813 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6814 | io_req_track_inflight(req); | |
8371adf5 | 6815 | return file; |
09bb8394 JA |
6816 | } |
6817 | ||
ac177053 | 6818 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6819 | struct io_kiocb *req, int fd, bool fixed) |
6820 | { | |
6821 | if (fixed) | |
6822 | return io_file_get_fixed(ctx, req, fd); | |
6823 | else | |
62906e89 | 6824 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6825 | } |
6826 | ||
f237c30a | 6827 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6828 | { |
6829 | struct io_kiocb *prev = req->timeout.prev; | |
8cb01fac | 6830 | int ret; |
89b263f6 JA |
6831 | |
6832 | if (prev) { | |
8cb01fac | 6833 | ret = io_try_cancel_userdata(req, prev->user_data); |
505657bc | 6834 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6835 | io_put_req(prev); |
89b263f6 JA |
6836 | } else { |
6837 | io_req_complete_post(req, -ETIME, 0); | |
6838 | } | |
6839 | } | |
6840 | ||
2665abfd | 6841 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6842 | { |
ad8a48ac JA |
6843 | struct io_timeout_data *data = container_of(timer, |
6844 | struct io_timeout_data, timer); | |
90cd7e42 | 6845 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6846 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6847 | unsigned long flags; |
2665abfd | 6848 | |
89b263f6 | 6849 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6850 | prev = req->timeout.head; |
6851 | req->timeout.head = NULL; | |
2665abfd JA |
6852 | |
6853 | /* | |
6854 | * We don't expect the list to be empty, that will only happen if we | |
6855 | * race with the completion of the linked work. | |
6856 | */ | |
447c19f3 | 6857 | if (prev) { |
f2f87370 | 6858 | io_remove_next_linked(prev); |
447c19f3 PB |
6859 | if (!req_ref_inc_not_zero(prev)) |
6860 | prev = NULL; | |
6861 | } | |
ef9dd637 | 6862 | list_del(&req->timeout.list); |
89b263f6 JA |
6863 | req->timeout.prev = prev; |
6864 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6865 | |
89b263f6 JA |
6866 | req->io_task_work.func = io_req_task_link_timeout; |
6867 | io_req_task_work_add(req); | |
2665abfd JA |
6868 | return HRTIMER_NORESTART; |
6869 | } | |
6870 | ||
de968c18 | 6871 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6872 | { |
de968c18 PB |
6873 | struct io_ring_ctx *ctx = req->ctx; |
6874 | ||
89b263f6 | 6875 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6876 | /* |
f2f87370 PB |
6877 | * If the back reference is NULL, then our linked request finished |
6878 | * before we got a chance to setup the timer | |
76a46e06 | 6879 | */ |
90cd7e42 | 6880 | if (req->timeout.head) { |
e8c2bc1f | 6881 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6882 | |
ad8a48ac JA |
6883 | data->timer.function = io_link_timeout_fn; |
6884 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6885 | data->mode); | |
ef9dd637 | 6886 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6887 | } |
89b263f6 | 6888 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6889 | /* drop submission reference */ |
76a46e06 JA |
6890 | io_put_req(req); |
6891 | } | |
2665abfd | 6892 | |
d475a9a6 PB |
6893 | static void io_queue_sqe_arm_apoll(struct io_kiocb *req) |
6894 | __must_hold(&req->ctx->uring_lock) | |
6895 | { | |
6896 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); | |
6897 | ||
6898 | switch (io_arm_poll_handler(req)) { | |
6899 | case IO_APOLL_READY: | |
6900 | if (linked_timeout) { | |
6901 | io_unprep_linked_timeout(req); | |
6902 | linked_timeout = NULL; | |
6903 | } | |
6904 | io_req_task_queue(req); | |
6905 | break; | |
6906 | case IO_APOLL_ABORTED: | |
6907 | /* | |
6908 | * Queued up for async execution, worker will release | |
6909 | * submit reference when the iocb is actually submitted. | |
6910 | */ | |
6911 | io_queue_async_work(req, NULL); | |
6912 | break; | |
6913 | } | |
6914 | ||
6915 | if (linked_timeout) | |
6916 | io_queue_linked_timeout(linked_timeout); | |
6917 | } | |
6918 | ||
6919 | static inline void __io_queue_sqe(struct io_kiocb *req) | |
282cdc86 | 6920 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6921 | { |
906c6caa | 6922 | struct io_kiocb *linked_timeout; |
e0c5c576 | 6923 | int ret; |
2b188cc1 | 6924 | |
c5eef2b9 | 6925 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6926 | |
fff4e40e PB |
6927 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
6928 | io_req_add_compl_list(req); | |
d9f9d284 | 6929 | return; |
fff4e40e | 6930 | } |
491381ce JA |
6931 | /* |
6932 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6933 | * doesn't support non-blocking read/write attempts | |
6934 | */ | |
1840038e | 6935 | if (likely(!ret)) { |
906c6caa PB |
6936 | linked_timeout = io_prep_linked_timeout(req); |
6937 | if (linked_timeout) | |
6938 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 6939 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d475a9a6 | 6940 | io_queue_sqe_arm_apoll(req); |
0d63c148 | 6941 | } else { |
f41db273 | 6942 | io_req_complete_failed(req, ret); |
9e645e11 | 6943 | } |
2b188cc1 JA |
6944 | } |
6945 | ||
4652fe3f | 6946 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 6947 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 6948 | { |
4652fe3f | 6949 | if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 6950 | io_req_complete_fail_submit(req); |
e0eb71dc PB |
6951 | } else if (unlikely(req->ctx->drain_active)) { |
6952 | io_drain_req(req); | |
76cc33d7 PB |
6953 | } else { |
6954 | int ret = io_req_prep_async(req); | |
6955 | ||
6956 | if (unlikely(ret)) | |
6957 | io_req_complete_failed(req, ret); | |
6958 | else | |
f237c30a | 6959 | io_queue_async_work(req, NULL); |
ce35a47a | 6960 | } |
4fe2c963 JL |
6961 | } |
6962 | ||
4652fe3f PB |
6963 | static inline void io_queue_sqe(struct io_kiocb *req) |
6964 | __must_hold(&req->ctx->uring_lock) | |
6965 | { | |
6966 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) | |
6967 | __io_queue_sqe(req); | |
6968 | else | |
6969 | io_queue_sqe_fallback(req); | |
6970 | } | |
6971 | ||
b16fed66 PB |
6972 | /* |
6973 | * Check SQE restrictions (opcode and flags). | |
6974 | * | |
6975 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6976 | */ | |
6977 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6978 | struct io_kiocb *req, | |
6979 | unsigned int sqe_flags) | |
4fe2c963 | 6980 | { |
b16fed66 PB |
6981 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
6982 | return false; | |
6983 | ||
6984 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6985 | ctx->restrictions.sqe_flags_required) | |
6986 | return false; | |
6987 | ||
6988 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6989 | ctx->restrictions.sqe_flags_required)) | |
6990 | return false; | |
6991 | ||
6992 | return true; | |
4fe2c963 JL |
6993 | } |
6994 | ||
22b2ca31 PB |
6995 | static void io_init_req_drain(struct io_kiocb *req) |
6996 | { | |
6997 | struct io_ring_ctx *ctx = req->ctx; | |
6998 | struct io_kiocb *head = ctx->submit_state.link.head; | |
6999 | ||
7000 | ctx->drain_active = true; | |
7001 | if (head) { | |
7002 | /* | |
7003 | * If we need to drain a request in the middle of a link, drain | |
7004 | * the head request and the next request/link after the current | |
7005 | * link. Considering sequential execution of links, | |
7006 | * IOSQE_IO_DRAIN will be maintained for every request of our | |
7007 | * link. | |
7008 | */ | |
7009 | head->flags |= IOSQE_IO_DRAIN | REQ_F_FORCE_ASYNC; | |
7010 | ctx->drain_next = true; | |
7011 | } | |
7012 | } | |
7013 | ||
b16fed66 PB |
7014 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7015 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7016 | __must_hold(&ctx->uring_lock) |
b16fed66 | 7017 | { |
b16fed66 | 7018 | unsigned int sqe_flags; |
fc0ae024 | 7019 | int personality; |
4a04d1d1 | 7020 | u8 opcode; |
b16fed66 | 7021 | |
864ea921 | 7022 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 7023 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
7024 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
7025 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7026 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7027 | req->file = NULL; |
b16fed66 | 7028 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7029 | req->task = current; |
b16fed66 | 7030 | |
4a04d1d1 PB |
7031 | if (unlikely(opcode >= IORING_OP_LAST)) { |
7032 | req->opcode = 0; | |
b16fed66 | 7033 | return -EINVAL; |
4a04d1d1 | 7034 | } |
68fe256a PB |
7035 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
7036 | /* enforce forwards compatibility on users */ | |
7037 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
7038 | return -EINVAL; | |
7039 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
4a04d1d1 | 7040 | !io_op_defs[opcode].buffer_select) |
68fe256a | 7041 | return -EOPNOTSUPP; |
22b2ca31 PB |
7042 | if (sqe_flags & IOSQE_IO_DRAIN) |
7043 | io_init_req_drain(req); | |
2a56a9bd PB |
7044 | } |
7045 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
7046 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
7047 | return -EACCES; | |
7048 | /* knock it to the slow queue path, will be drained there */ | |
7049 | if (ctx->drain_active) | |
7050 | req->flags |= REQ_F_FORCE_ASYNC; | |
7051 | /* if there is no link, we're at "next" request and need to drain */ | |
7052 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
7053 | ctx->drain_next = false; | |
7054 | ctx->drain_active = true; | |
22b2ca31 | 7055 | req->flags |= IOSQE_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 7056 | } |
68fe256a | 7057 | } |
b16fed66 | 7058 | |
4a04d1d1 | 7059 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
7060 | struct io_submit_state *state = &ctx->submit_state; |
7061 | ||
7062 | /* | |
7063 | * Plug now if we have more than 2 IO left after this, and the | |
7064 | * target is potentially a read/write to block based storage. | |
7065 | */ | |
4a04d1d1 | 7066 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
7067 | state->plug_started = true; |
7068 | state->need_plug = false; | |
7069 | blk_start_plug(&state->plug); | |
7070 | } | |
7071 | ||
62906e89 | 7072 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 7073 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 | 7074 | if (unlikely(!req->file)) |
fc0ae024 | 7075 | return -EBADF; |
b16fed66 | 7076 | } |
fc0ae024 | 7077 | |
4a04d1d1 PB |
7078 | personality = READ_ONCE(sqe->personality); |
7079 | if (personality) { | |
7080 | req->creds = xa_load(&ctx->personalities, personality); | |
7081 | if (!req->creds) | |
7082 | return -EINVAL; | |
7083 | get_cred(req->creds); | |
7084 | req->flags |= REQ_F_CREDS; | |
7085 | } | |
7086 | ||
fc0ae024 | 7087 | return io_req_prep(req, sqe); |
b16fed66 PB |
7088 | } |
7089 | ||
a6b8cadc | 7090 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7091 | const struct io_uring_sqe *sqe) |
282cdc86 | 7092 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7093 | { |
a1ab7b35 | 7094 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7095 | int ret; |
9e645e11 | 7096 | |
a6b8cadc PB |
7097 | ret = io_init_req(ctx, req, sqe); |
7098 | if (unlikely(ret)) { | |
a87acfde JA |
7099 | trace_io_uring_req_failed(sqe, ret); |
7100 | ||
a8295b98 | 7101 | /* fail even hard links since we don't submit */ |
de59bc10 | 7102 | if (link->head) { |
a8295b98 HX |
7103 | /* |
7104 | * we can judge a link req is failed or cancelled by if | |
7105 | * REQ_F_FAIL is set, but the head is an exception since | |
7106 | * it may be set REQ_F_FAIL because of other req's failure | |
7107 | * so let's leverage req->result to distinguish if a head | |
7108 | * is set REQ_F_FAIL because of its failure or other req's | |
7109 | * failure so that we can set the correct ret code for it. | |
7110 | * init result here to avoid affecting the normal path. | |
7111 | */ | |
7112 | if (!(link->head->flags & REQ_F_FAIL)) | |
7113 | req_fail_link_node(link->head, -ECANCELED); | |
7114 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7115 | /* | |
7116 | * the current req is a normal req, we should return | |
7117 | * error and thus break the submittion loop. | |
7118 | */ | |
7119 | io_req_complete_failed(req, ret); | |
7120 | return ret; | |
de59bc10 | 7121 | } |
a8295b98 | 7122 | req_fail_link_node(req, ret); |
a6b8cadc | 7123 | } |
441b8a78 | 7124 | |
be7053b7 | 7125 | /* don't need @sqe from now on */ |
236daeae OL |
7126 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
7127 | req->flags, true, | |
7128 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7129 | |
9e645e11 JA |
7130 | /* |
7131 | * If we already have a head request, queue this one for async | |
7132 | * submittal once the head completes. If we don't have a head but | |
7133 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7134 | * submitted sync once the chain is complete. If none of those | |
7135 | * conditions are true (normal request), then just queue it. | |
7136 | */ | |
863e0560 PB |
7137 | if (link->head) { |
7138 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7139 | |
a8295b98 HX |
7140 | if (!(req->flags & REQ_F_FAIL)) { |
7141 | ret = io_req_prep_async(req); | |
7142 | if (unlikely(ret)) { | |
7143 | req_fail_link_node(req, ret); | |
7144 | if (!(head->flags & REQ_F_FAIL)) | |
7145 | req_fail_link_node(head, -ECANCELED); | |
7146 | } | |
7147 | } | |
9d76377f | 7148 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7149 | link->last->link = req; |
863e0560 | 7150 | link->last = req; |
32fe525b | 7151 | |
f15a3431 PB |
7152 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) |
7153 | return 0; | |
32fe525b | 7154 | /* last request of a link, enqueue the link */ |
f15a3431 PB |
7155 | link->head = NULL; |
7156 | req = head; | |
7157 | } else if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { | |
7158 | link->head = req; | |
7159 | link->last = req; | |
7160 | return 0; | |
9e645e11 | 7161 | } |
2e6e1fde | 7162 | |
f15a3431 | 7163 | io_queue_sqe(req); |
1d4240cc | 7164 | return 0; |
9e645e11 JA |
7165 | } |
7166 | ||
9a56a232 JA |
7167 | /* |
7168 | * Batched submission is done, ensure local IO is flushed out. | |
7169 | */ | |
553deffd | 7170 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 7171 | { |
553deffd PB |
7172 | struct io_submit_state *state = &ctx->submit_state; |
7173 | ||
a1ab7b35 | 7174 | if (state->link.head) |
de59bc10 | 7175 | io_queue_sqe(state->link.head); |
553deffd | 7176 | /* flush only after queuing links as they can generate completions */ |
c450178d | 7177 | io_submit_flush_completions(ctx); |
27926b68 JA |
7178 | if (state->plug_started) |
7179 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7180 | } |
7181 | ||
7182 | /* | |
7183 | * Start submission side cache. | |
7184 | */ | |
7185 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7186 | unsigned int max_ios) |
9a56a232 | 7187 | { |
27926b68 | 7188 | state->plug_started = false; |
4b628aeb | 7189 | state->need_plug = max_ios > 2; |
a1ab7b35 PB |
7190 | /* set only head, no need to init link_last in advance */ |
7191 | state->link.head = NULL; | |
9a56a232 JA |
7192 | } |
7193 | ||
2b188cc1 JA |
7194 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7195 | { | |
75b28aff | 7196 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7197 | |
caf582c6 PB |
7198 | /* |
7199 | * Ensure any loads from the SQEs are done at this point, | |
7200 | * since once we write the new head, the application could | |
7201 | * write new data to them. | |
7202 | */ | |
7203 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7204 | } |
7205 | ||
2b188cc1 | 7206 | /* |
dd9ae8a0 | 7207 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7208 | * that is mapped by userspace. This means that care needs to be taken to |
7209 | * ensure that reads are stable, as we cannot rely on userspace always | |
7210 | * being a good citizen. If members of the sqe are validated and then later | |
7211 | * used, it's important that those reads are done through READ_ONCE() to | |
7212 | * prevent a re-load down the line. | |
7213 | */ | |
709b302f | 7214 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7215 | { |
ea5ab3b5 | 7216 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7217 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7218 | |
7219 | /* | |
7220 | * The cached sq head (or cq tail) serves two purposes: | |
7221 | * | |
7222 | * 1) allows us to batch the cost of updating the user visible | |
7223 | * head updates. | |
7224 | * 2) allows the kernel side to track the head on its own, even | |
7225 | * though the application is the one updating it. | |
7226 | */ | |
17d3aeb3 | 7227 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7228 | if (likely(head < ctx->sq_entries)) |
7229 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7230 | |
7231 | /* drop invalid entries */ | |
15641e42 PB |
7232 | ctx->cq_extra--; |
7233 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7234 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7235 | return NULL; |
7236 | } | |
7237 | ||
0f212204 | 7238 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7239 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7240 | { |
69629809 | 7241 | unsigned int entries = io_sqring_entries(ctx); |
46c4e16a | 7242 | int submitted = 0; |
6c271ce2 | 7243 | |
51d48dab | 7244 | if (unlikely(!entries)) |
69629809 | 7245 | return 0; |
ee7d46d9 | 7246 | /* make sure SQ entry isn't read before tail */ |
69629809 | 7247 | nr = min3(nr, ctx->sq_entries, entries); |
9a10867a | 7248 | io_get_task_refs(nr); |
6c271ce2 | 7249 | |
ba88ff11 | 7250 | io_submit_state_start(&ctx->submit_state, nr); |
69629809 | 7251 | do { |
3529d8c2 | 7252 | const struct io_uring_sqe *sqe; |
196be95c | 7253 | struct io_kiocb *req; |
fb5ccc98 | 7254 | |
a33ae9ce | 7255 | if (unlikely(!io_alloc_req_refill(ctx))) { |
196be95c PB |
7256 | if (!submitted) |
7257 | submitted = -EAGAIN; | |
fb5ccc98 | 7258 | break; |
196be95c | 7259 | } |
a33ae9ce | 7260 | req = io_alloc_req(ctx); |
4fccfcbb PB |
7261 | sqe = io_get_sqe(ctx); |
7262 | if (unlikely(!sqe)) { | |
c2b6c6bc | 7263 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
4fccfcbb PB |
7264 | break; |
7265 | } | |
d3656344 JA |
7266 | /* will complete beyond this point, count as submitted */ |
7267 | submitted++; | |
a1ab7b35 | 7268 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7269 | break; |
69629809 | 7270 | } while (submitted < nr); |
6c271ce2 | 7271 | |
9466f437 PB |
7272 | if (unlikely(submitted != nr)) { |
7273 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7274 | int unused = nr - ref_used; |
9466f437 | 7275 | |
09899b19 | 7276 | current->io_uring->cached_refs += unused; |
9466f437 | 7277 | } |
6c271ce2 | 7278 | |
553deffd | 7279 | io_submit_state_end(ctx); |
ae9428ca PB |
7280 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7281 | io_commit_sqring(ctx); | |
7282 | ||
6c271ce2 JA |
7283 | return submitted; |
7284 | } | |
7285 | ||
e4b6d902 PB |
7286 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7287 | { | |
7288 | return READ_ONCE(sqd->state); | |
7289 | } | |
7290 | ||
23b3628e XW |
7291 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7292 | { | |
7293 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7294 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7295 | WRITE_ONCE(ctx->rings->sq_flags, |
7296 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7297 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7298 | } |
7299 | ||
7300 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7301 | { | |
79ebeaee | 7302 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7303 | WRITE_ONCE(ctx->rings->sq_flags, |
7304 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7305 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7306 | } |
7307 | ||
08369246 | 7308 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7309 | { |
c8d1ba58 | 7310 | unsigned int to_submit; |
bdcd3eab | 7311 | int ret = 0; |
6c271ce2 | 7312 | |
c8d1ba58 | 7313 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7314 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7315 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7316 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7317 | |
5eef4e87 | 7318 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
7319 | const struct cred *creds = NULL; |
7320 | ||
7321 | if (ctx->sq_creds != current_cred()) | |
7322 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7323 | |
c8d1ba58 | 7324 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 7325 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 7326 | io_do_iopoll(ctx, true); |
906a3c6f | 7327 | |
3b763ba1 PB |
7328 | /* |
7329 | * Don't submit if refs are dying, good for io_uring_register(), | |
7330 | * but also it is relied upon by io_ring_exit_work() | |
7331 | */ | |
0298ef96 PB |
7332 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7333 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7334 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7335 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7336 | |
acfb381d PB |
7337 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7338 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7339 | if (creds) |
7340 | revert_creds(creds); | |
acfb381d | 7341 | } |
6c271ce2 | 7342 | |
08369246 XW |
7343 | return ret; |
7344 | } | |
6c271ce2 | 7345 | |
c072481d | 7346 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
7347 | { |
7348 | struct io_ring_ctx *ctx; | |
7349 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7350 | |
c9dca27d PB |
7351 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7352 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7353 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7354 | } |
6c271ce2 | 7355 | |
e4b6d902 PB |
7356 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7357 | { | |
7358 | bool did_sig = false; | |
7359 | struct ksignal ksig; | |
7360 | ||
7361 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7362 | signal_pending(current)) { | |
7363 | mutex_unlock(&sqd->lock); | |
7364 | if (signal_pending(current)) | |
7365 | did_sig = get_signal(&ksig); | |
7366 | cond_resched(); | |
7367 | mutex_lock(&sqd->lock); | |
7368 | } | |
e4b6d902 PB |
7369 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7370 | } | |
7371 | ||
c8d1ba58 JA |
7372 | static int io_sq_thread(void *data) |
7373 | { | |
69fb2131 JA |
7374 | struct io_sq_data *sqd = data; |
7375 | struct io_ring_ctx *ctx; | |
a0d9205f | 7376 | unsigned long timeout = 0; |
37d1e2e3 | 7377 | char buf[TASK_COMM_LEN]; |
08369246 | 7378 | DEFINE_WAIT(wait); |
6c271ce2 | 7379 | |
696ee88a | 7380 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7381 | set_task_comm(current, buf); |
37d1e2e3 JA |
7382 | |
7383 | if (sqd->sq_cpu != -1) | |
7384 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7385 | else | |
7386 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7387 | current->flags |= PF_NO_SETAFFINITY; | |
7388 | ||
09a6f4ef | 7389 | mutex_lock(&sqd->lock); |
e4b6d902 | 7390 | while (1) { |
1a924a80 | 7391 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7392 | |
e4b6d902 PB |
7393 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7394 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7395 | break; |
08369246 XW |
7396 | timeout = jiffies + sqd->sq_thread_idle; |
7397 | } | |
e4b6d902 | 7398 | |
e95eee2d | 7399 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7400 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7401 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7402 | |
5eef4e87 | 7403 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 7404 | sqt_spin = true; |
69fb2131 | 7405 | } |
dd432ea5 PB |
7406 | if (io_run_task_work()) |
7407 | sqt_spin = true; | |
6c271ce2 | 7408 | |
08369246 | 7409 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7410 | cond_resched(); |
08369246 XW |
7411 | if (sqt_spin) |
7412 | timeout = jiffies + sqd->sq_thread_idle; | |
7413 | continue; | |
7414 | } | |
7415 | ||
08369246 | 7416 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7417 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7418 | bool needs_sched = true; |
7419 | ||
724cb4f9 | 7420 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7421 | io_ring_set_wakeup_flag(ctx); |
7422 | ||
724cb4f9 | 7423 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 7424 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
7425 | needs_sched = false; |
7426 | break; | |
7427 | } | |
7428 | if (io_sqring_entries(ctx)) { | |
7429 | needs_sched = false; | |
7430 | break; | |
7431 | } | |
7432 | } | |
7433 | ||
7434 | if (needs_sched) { | |
7435 | mutex_unlock(&sqd->lock); | |
7436 | schedule(); | |
7437 | mutex_lock(&sqd->lock); | |
7438 | } | |
69fb2131 JA |
7439 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7440 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7441 | } |
08369246 XW |
7442 | |
7443 | finish_wait(&sqd->wait, &wait); | |
7444 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7445 | } |
28cea78a | 7446 | |
78cc687b | 7447 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7448 | sqd->thread = NULL; |
05962f95 | 7449 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7450 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7451 | io_run_task_work(); |
734551df PB |
7452 | mutex_unlock(&sqd->lock); |
7453 | ||
37d1e2e3 JA |
7454 | complete(&sqd->exited); |
7455 | do_exit(0); | |
6c271ce2 JA |
7456 | } |
7457 | ||
bda52162 JA |
7458 | struct io_wait_queue { |
7459 | struct wait_queue_entry wq; | |
7460 | struct io_ring_ctx *ctx; | |
5fd46178 | 7461 | unsigned cq_tail; |
bda52162 JA |
7462 | unsigned nr_timeouts; |
7463 | }; | |
7464 | ||
6c503150 | 7465 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7466 | { |
7467 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7468 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7469 | |
7470 | /* | |
d195a66e | 7471 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7472 | * started waiting. For timeouts, we always want to return to userspace, |
7473 | * regardless of event count. | |
7474 | */ | |
5fd46178 | 7475 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7476 | } |
7477 | ||
7478 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7479 | int wake_flags, void *key) | |
7480 | { | |
7481 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7482 | wq); | |
7483 | ||
6c503150 PB |
7484 | /* |
7485 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7486 | * the task, and the next invocation will do it. | |
7487 | */ | |
5ed7a37d | 7488 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7489 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7490 | return -1; | |
bda52162 JA |
7491 | } |
7492 | ||
af9c1a44 JA |
7493 | static int io_run_task_work_sig(void) |
7494 | { | |
7495 | if (io_run_task_work()) | |
7496 | return 1; | |
7497 | if (!signal_pending(current)) | |
7498 | return 0; | |
0b8cfa97 | 7499 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7500 | return -ERESTARTSYS; |
af9c1a44 JA |
7501 | return -EINTR; |
7502 | } | |
7503 | ||
eeb60b9a PB |
7504 | /* when returns >0, the caller should retry */ |
7505 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7506 | struct io_wait_queue *iowq, | |
7507 | signed long *timeout) | |
7508 | { | |
7509 | int ret; | |
7510 | ||
7511 | /* make sure we run task_work before checking for signals */ | |
7512 | ret = io_run_task_work_sig(); | |
7513 | if (ret || io_should_wake(iowq)) | |
7514 | return ret; | |
7515 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7516 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7517 | return 1; |
7518 | ||
7519 | *timeout = schedule_timeout(*timeout); | |
7520 | return !*timeout ? -ETIME : 1; | |
7521 | } | |
7522 | ||
2b188cc1 JA |
7523 | /* |
7524 | * Wait until events become available, if we don't already have some. The | |
7525 | * application must reap them itself, as they reside on the shared cq ring. | |
7526 | */ | |
7527 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7528 | const sigset_t __user *sig, size_t sigsz, |
7529 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7530 | { |
90291099 | 7531 | struct io_wait_queue iowq; |
75b28aff | 7532 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7533 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7534 | int ret; | |
2b188cc1 | 7535 | |
b41e9852 | 7536 | do { |
90f67366 | 7537 | io_cqring_overflow_flush(ctx); |
6c503150 | 7538 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7539 | return 0; |
4c6e277c | 7540 | if (!io_run_task_work()) |
b41e9852 | 7541 | break; |
b41e9852 | 7542 | } while (1); |
2b188cc1 | 7543 | |
44df58d4 XW |
7544 | if (uts) { |
7545 | struct timespec64 ts; | |
7546 | ||
7547 | if (get_timespec64(&ts, uts)) | |
7548 | return -EFAULT; | |
7549 | timeout = timespec64_to_jiffies(&ts); | |
7550 | } | |
7551 | ||
2b188cc1 | 7552 | if (sig) { |
9e75ad5d AB |
7553 | #ifdef CONFIG_COMPAT |
7554 | if (in_compat_syscall()) | |
7555 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7556 | sigsz); |
9e75ad5d AB |
7557 | else |
7558 | #endif | |
b772434b | 7559 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7560 | |
2b188cc1 JA |
7561 | if (ret) |
7562 | return ret; | |
7563 | } | |
7564 | ||
90291099 PB |
7565 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7566 | iowq.wq.private = current; | |
7567 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7568 | iowq.ctx = ctx; | |
bda52162 | 7569 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7570 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7571 | |
c826bd7a | 7572 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7573 | do { |
ca0a2651 | 7574 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7575 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7576 | ret = -EBUSY; |
7577 | break; | |
7578 | } | |
311997b3 | 7579 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7580 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7581 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7582 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7583 | cond_resched(); |
eeb60b9a | 7584 | } while (ret > 0); |
bda52162 | 7585 | |
b7db41c9 | 7586 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7587 | |
75b28aff | 7588 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7589 | } |
7590 | ||
9123c8ff | 7591 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7592 | { |
9123c8ff | 7593 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7594 | |
846a4ef2 | 7595 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7596 | kfree(table[i]); |
7597 | kfree(table); | |
7598 | } | |
7599 | ||
c072481d | 7600 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
7601 | { |
7602 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7603 | size_t init_size = size; | |
7604 | void **table; | |
7605 | ||
0bea96f5 | 7606 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7607 | if (!table) |
7608 | return NULL; | |
7609 | ||
7610 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7611 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7612 | |
0bea96f5 | 7613 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7614 | if (!table[i]) { |
7615 | io_free_page_table(table, init_size); | |
7616 | return NULL; | |
7617 | } | |
7618 | size -= this_size; | |
7619 | } | |
7620 | return table; | |
05f3fb3c JA |
7621 | } |
7622 | ||
28a9fe25 | 7623 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7624 | { |
28a9fe25 PB |
7625 | percpu_ref_exit(&ref_node->refs); |
7626 | kfree(ref_node); | |
1642b445 PB |
7627 | } |
7628 | ||
c072481d | 7629 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
7630 | { |
7631 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7632 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7633 | unsigned long flags; | |
7634 | bool first_add = false; | |
7635 | ||
7636 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7637 | node->done = true; | |
7638 | ||
7639 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7640 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7641 | struct io_rsrc_node, node); | |
7642 | /* recycle ref nodes in order */ | |
7643 | if (!node->done) | |
7644 | break; | |
7645 | list_del(&node->node); | |
7646 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7647 | } | |
7648 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7649 | ||
7650 | if (first_add) | |
7651 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7652 | } | |
7653 | ||
7654 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7655 | { | |
7656 | struct io_rsrc_node *ref_node; | |
7657 | ||
7658 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7659 | if (!ref_node) | |
7660 | return NULL; | |
7661 | ||
7662 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7663 | 0, GFP_KERNEL)) { | |
7664 | kfree(ref_node); | |
7665 | return NULL; | |
7666 | } | |
7667 | INIT_LIST_HEAD(&ref_node->node); | |
7668 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7669 | ref_node->done = false; | |
7670 | return ref_node; | |
7671 | } | |
7672 | ||
a7f0ed5a PB |
7673 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7674 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 7675 | __must_hold(&ctx->uring_lock) |
6b06314c | 7676 | { |
a7f0ed5a PB |
7677 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7678 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7679 | |
ab409402 PB |
7680 | io_rsrc_refs_drop(ctx); |
7681 | ||
a7f0ed5a PB |
7682 | if (data_to_kill) { |
7683 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7684 | |
a7f0ed5a | 7685 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7686 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7687 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7688 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7689 | |
3e942498 | 7690 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7691 | percpu_ref_kill(&rsrc_node->refs); |
7692 | ctx->rsrc_node = NULL; | |
7693 | } | |
6b06314c | 7694 | |
a7f0ed5a PB |
7695 | if (!ctx->rsrc_node) { |
7696 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7697 | ctx->rsrc_backup_node = NULL; | |
7698 | } | |
8bad28d8 HX |
7699 | } |
7700 | ||
a7f0ed5a | 7701 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7702 | { |
7703 | if (ctx->rsrc_backup_node) | |
7704 | return 0; | |
b895c9a6 | 7705 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7706 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7707 | } |
7708 | ||
c072481d PB |
7709 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
7710 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
7711 | { |
7712 | int ret; | |
05589553 | 7713 | |
215c3902 | 7714 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7715 | if (data->quiesce) |
7716 | return -ENXIO; | |
05589553 | 7717 | |
8bad28d8 | 7718 | data->quiesce = true; |
1ffc5422 | 7719 | do { |
a7f0ed5a | 7720 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7721 | if (ret) |
f2303b1f | 7722 | break; |
a7f0ed5a | 7723 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7724 | |
3e942498 PB |
7725 | /* kill initial ref, already quiesced if zero */ |
7726 | if (atomic_dec_and_test(&data->refs)) | |
7727 | break; | |
c018db4a | 7728 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7729 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7730 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7731 | if (!ret) { |
7732 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7733 | break; |
c018db4a | 7734 | } |
8bad28d8 | 7735 | |
3e942498 PB |
7736 | atomic_inc(&data->refs); |
7737 | /* wait for all works potentially completing data->done */ | |
7738 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7739 | reinit_completion(&data->done); |
8dd03afe | 7740 | |
1ffc5422 | 7741 | ret = io_run_task_work_sig(); |
8bad28d8 | 7742 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7743 | } while (ret >= 0); |
8bad28d8 | 7744 | data->quiesce = false; |
05f3fb3c | 7745 | |
8bad28d8 | 7746 | return ret; |
d7954b2b BM |
7747 | } |
7748 | ||
2d091d62 PB |
7749 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7750 | { | |
7751 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7752 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7753 | ||
7754 | return &data->tags[table_idx][off]; | |
7755 | } | |
7756 | ||
44b31f2f | 7757 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7758 | { |
2d091d62 PB |
7759 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7760 | ||
7761 | if (data->tags) | |
7762 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7763 | kfree(data); |
7764 | } | |
7765 | ||
c072481d PB |
7766 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7767 | u64 __user *utags, unsigned nr, | |
7768 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7769 | { |
b895c9a6 | 7770 | struct io_rsrc_data *data; |
2d091d62 | 7771 | int ret = -ENOMEM; |
d878c816 | 7772 | unsigned i; |
1ad555c6 BM |
7773 | |
7774 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7775 | if (!data) | |
d878c816 | 7776 | return -ENOMEM; |
2d091d62 | 7777 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7778 | if (!data->tags) { |
1ad555c6 | 7779 | kfree(data); |
d878c816 PB |
7780 | return -ENOMEM; |
7781 | } | |
2d091d62 PB |
7782 | |
7783 | data->nr = nr; | |
7784 | data->ctx = ctx; | |
7785 | data->do_put = do_put; | |
d878c816 | 7786 | if (utags) { |
2d091d62 | 7787 | ret = -EFAULT; |
d878c816 | 7788 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7789 | u64 *tag_slot = io_get_tag_slot(data, i); |
7790 | ||
7791 | if (copy_from_user(tag_slot, &utags[i], | |
7792 | sizeof(*tag_slot))) | |
2d091d62 | 7793 | goto fail; |
d878c816 | 7794 | } |
1ad555c6 | 7795 | } |
b60c8dce | 7796 | |
3e942498 | 7797 | atomic_set(&data->refs, 1); |
1ad555c6 | 7798 | init_completion(&data->done); |
d878c816 PB |
7799 | *pdata = data; |
7800 | return 0; | |
2d091d62 PB |
7801 | fail: |
7802 | io_rsrc_data_free(data); | |
7803 | return ret; | |
1ad555c6 BM |
7804 | } |
7805 | ||
9123c8ff PB |
7806 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7807 | { | |
0bea96f5 PB |
7808 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7809 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7810 | return !!table->files; |
7811 | } | |
7812 | ||
042b0d85 | 7813 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7814 | { |
042b0d85 | 7815 | kvfree(table->files); |
9123c8ff PB |
7816 | table->files = NULL; |
7817 | } | |
7818 | ||
fff4db76 | 7819 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7820 | { |
fff4db76 PB |
7821 | #if defined(CONFIG_UNIX) |
7822 | if (ctx->ring_sock) { | |
7823 | struct sock *sock = ctx->ring_sock->sk; | |
7824 | struct sk_buff *skb; | |
7825 | ||
7826 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7827 | kfree_skb(skb); | |
7828 | } | |
7829 | #else | |
7830 | int i; | |
7831 | ||
7832 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7833 | struct file *file; | |
7834 | ||
7835 | file = io_file_from_index(ctx, i); | |
7836 | if (file) | |
7837 | fput(file); | |
7838 | } | |
7839 | #endif | |
042b0d85 | 7840 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7841 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7842 | ctx->file_data = NULL; |
7843 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7844 | } |
7845 | ||
d7954b2b BM |
7846 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7847 | { | |
d7954b2b BM |
7848 | int ret; |
7849 | ||
08480400 | 7850 | if (!ctx->file_data) |
d7954b2b | 7851 | return -ENXIO; |
08480400 PB |
7852 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7853 | if (!ret) | |
7854 | __io_sqe_files_unregister(ctx); | |
7855 | return ret; | |
6b06314c JA |
7856 | } |
7857 | ||
37d1e2e3 | 7858 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7859 | __releases(&sqd->lock) |
37d1e2e3 | 7860 | { |
521d6a73 PB |
7861 | WARN_ON_ONCE(sqd->thread == current); |
7862 | ||
9e138a48 PB |
7863 | /* |
7864 | * Do the dance but not conditional clear_bit() because it'd race with | |
7865 | * other threads incrementing park_pending and setting the bit. | |
7866 | */ | |
37d1e2e3 | 7867 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7868 | if (atomic_dec_return(&sqd->park_pending)) |
7869 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7870 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7871 | } |
7872 | ||
86e0d676 | 7873 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7874 | __acquires(&sqd->lock) |
37d1e2e3 | 7875 | { |
521d6a73 PB |
7876 | WARN_ON_ONCE(sqd->thread == current); |
7877 | ||
9e138a48 | 7878 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7879 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7880 | mutex_lock(&sqd->lock); |
05962f95 | 7881 | if (sqd->thread) |
86e0d676 | 7882 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7883 | } |
7884 | ||
7885 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7886 | { | |
521d6a73 | 7887 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7888 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7889 | |
05962f95 | 7890 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7891 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7892 | if (sqd->thread) |
7893 | wake_up_process(sqd->thread); | |
09a6f4ef | 7894 | mutex_unlock(&sqd->lock); |
05962f95 | 7895 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7896 | } |
7897 | ||
534ca6d6 | 7898 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7899 | { |
534ca6d6 | 7900 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7901 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7902 | ||
37d1e2e3 JA |
7903 | io_sq_thread_stop(sqd); |
7904 | kfree(sqd); | |
7905 | } | |
7906 | } | |
7907 | ||
7908 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7909 | { | |
7910 | struct io_sq_data *sqd = ctx->sq_data; | |
7911 | ||
7912 | if (sqd) { | |
05962f95 | 7913 | io_sq_thread_park(sqd); |
521d6a73 | 7914 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7915 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7916 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7917 | |
7918 | io_put_sq_data(sqd); | |
7919 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7920 | } |
7921 | } | |
7922 | ||
aa06165d JA |
7923 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7924 | { | |
7925 | struct io_ring_ctx *ctx_attach; | |
7926 | struct io_sq_data *sqd; | |
7927 | struct fd f; | |
7928 | ||
7929 | f = fdget(p->wq_fd); | |
7930 | if (!f.file) | |
7931 | return ERR_PTR(-ENXIO); | |
7932 | if (f.file->f_op != &io_uring_fops) { | |
7933 | fdput(f); | |
7934 | return ERR_PTR(-EINVAL); | |
7935 | } | |
7936 | ||
7937 | ctx_attach = f.file->private_data; | |
7938 | sqd = ctx_attach->sq_data; | |
7939 | if (!sqd) { | |
7940 | fdput(f); | |
7941 | return ERR_PTR(-EINVAL); | |
7942 | } | |
5c2469e0 JA |
7943 | if (sqd->task_tgid != current->tgid) { |
7944 | fdput(f); | |
7945 | return ERR_PTR(-EPERM); | |
7946 | } | |
aa06165d JA |
7947 | |
7948 | refcount_inc(&sqd->refs); | |
7949 | fdput(f); | |
7950 | return sqd; | |
7951 | } | |
7952 | ||
26984fbf PB |
7953 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7954 | bool *attached) | |
534ca6d6 JA |
7955 | { |
7956 | struct io_sq_data *sqd; | |
7957 | ||
26984fbf | 7958 | *attached = false; |
5c2469e0 JA |
7959 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7960 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7961 | if (!IS_ERR(sqd)) { |
7962 | *attached = true; | |
5c2469e0 | 7963 | return sqd; |
26984fbf | 7964 | } |
5c2469e0 JA |
7965 | /* fall through for EPERM case, setup new sqd/task */ |
7966 | if (PTR_ERR(sqd) != -EPERM) | |
7967 | return sqd; | |
7968 | } | |
aa06165d | 7969 | |
534ca6d6 JA |
7970 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7971 | if (!sqd) | |
7972 | return ERR_PTR(-ENOMEM); | |
7973 | ||
9e138a48 | 7974 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7975 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7976 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7977 | mutex_init(&sqd->lock); |
534ca6d6 | 7978 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7979 | init_completion(&sqd->exited); |
534ca6d6 JA |
7980 | return sqd; |
7981 | } | |
7982 | ||
6b06314c | 7983 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7984 | /* |
7985 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7986 | * the io_uring can be safely unregistered on process exit, even if we have | |
7987 | * loops in the file referencing. | |
7988 | */ | |
7989 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7990 | { | |
7991 | struct sock *sk = ctx->ring_sock->sk; | |
7992 | struct scm_fp_list *fpl; | |
7993 | struct sk_buff *skb; | |
08a45173 | 7994 | int i, nr_files; |
6b06314c | 7995 | |
6b06314c JA |
7996 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7997 | if (!fpl) | |
7998 | return -ENOMEM; | |
7999 | ||
8000 | skb = alloc_skb(0, GFP_KERNEL); | |
8001 | if (!skb) { | |
8002 | kfree(fpl); | |
8003 | return -ENOMEM; | |
8004 | } | |
8005 | ||
8006 | skb->sk = sk; | |
6b06314c | 8007 | |
08a45173 | 8008 | nr_files = 0; |
62e398be | 8009 | fpl->user = get_uid(current_user()); |
6b06314c | 8010 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
8011 | struct file *file = io_file_from_index(ctx, i + offset); |
8012 | ||
8013 | if (!file) | |
08a45173 | 8014 | continue; |
65e19f54 | 8015 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
8016 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
8017 | nr_files++; | |
6b06314c JA |
8018 | } |
8019 | ||
08a45173 JA |
8020 | if (nr_files) { |
8021 | fpl->max = SCM_MAX_FD; | |
8022 | fpl->count = nr_files; | |
8023 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 8024 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
8025 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
8026 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8027 | |
08a45173 JA |
8028 | for (i = 0; i < nr_files; i++) |
8029 | fput(fpl->fp[i]); | |
8030 | } else { | |
8031 | kfree_skb(skb); | |
8032 | kfree(fpl); | |
8033 | } | |
6b06314c JA |
8034 | |
8035 | return 0; | |
8036 | } | |
8037 | ||
8038 | /* | |
8039 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8040 | * causes regular reference counting to break down. We rely on the UNIX | |
8041 | * garbage collection to take care of this problem for us. | |
8042 | */ | |
8043 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8044 | { | |
8045 | unsigned left, total; | |
8046 | int ret = 0; | |
8047 | ||
8048 | total = 0; | |
8049 | left = ctx->nr_user_files; | |
8050 | while (left) { | |
8051 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8052 | |
8053 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8054 | if (ret) | |
8055 | break; | |
8056 | left -= this_files; | |
8057 | total += this_files; | |
8058 | } | |
8059 | ||
8060 | if (!ret) | |
8061 | return 0; | |
8062 | ||
8063 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8064 | struct file *file = io_file_from_index(ctx, total); |
8065 | ||
8066 | if (file) | |
8067 | fput(file); | |
6b06314c JA |
8068 | total++; |
8069 | } | |
8070 | ||
8071 | return ret; | |
8072 | } | |
8073 | #else | |
8074 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8075 | { | |
8076 | return 0; | |
8077 | } | |
8078 | #endif | |
8079 | ||
47e90392 | 8080 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8081 | { |
50238531 | 8082 | struct file *file = prsrc->file; |
05f3fb3c JA |
8083 | #if defined(CONFIG_UNIX) |
8084 | struct sock *sock = ctx->ring_sock->sk; | |
8085 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8086 | struct sk_buff *skb; | |
8087 | int i; | |
8088 | ||
8089 | __skb_queue_head_init(&list); | |
8090 | ||
8091 | /* | |
8092 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8093 | * remove this entry and rearrange the file array. | |
8094 | */ | |
8095 | skb = skb_dequeue(head); | |
8096 | while (skb) { | |
8097 | struct scm_fp_list *fp; | |
8098 | ||
8099 | fp = UNIXCB(skb).fp; | |
8100 | for (i = 0; i < fp->count; i++) { | |
8101 | int left; | |
8102 | ||
8103 | if (fp->fp[i] != file) | |
8104 | continue; | |
8105 | ||
8106 | unix_notinflight(fp->user, fp->fp[i]); | |
8107 | left = fp->count - 1 - i; | |
8108 | if (left) { | |
8109 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8110 | left * sizeof(struct file *)); | |
8111 | } | |
8112 | fp->count--; | |
8113 | if (!fp->count) { | |
8114 | kfree_skb(skb); | |
8115 | skb = NULL; | |
8116 | } else { | |
8117 | __skb_queue_tail(&list, skb); | |
8118 | } | |
8119 | fput(file); | |
8120 | file = NULL; | |
8121 | break; | |
8122 | } | |
8123 | ||
8124 | if (!file) | |
8125 | break; | |
8126 | ||
8127 | __skb_queue_tail(&list, skb); | |
8128 | ||
8129 | skb = skb_dequeue(head); | |
8130 | } | |
8131 | ||
8132 | if (skb_peek(&list)) { | |
8133 | spin_lock_irq(&head->lock); | |
8134 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8135 | __skb_queue_tail(head, skb); | |
8136 | spin_unlock_irq(&head->lock); | |
8137 | } | |
8138 | #else | |
8139 | fput(file); | |
8140 | #endif | |
8141 | } | |
8142 | ||
b895c9a6 | 8143 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8144 | { |
b895c9a6 | 8145 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8146 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8147 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8148 | |
269bbe5f BM |
8149 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8150 | list_del(&prsrc->list); | |
b60c8dce PB |
8151 | |
8152 | if (prsrc->tag) { | |
8153 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8154 | |
8155 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8156 | spin_lock(&ctx->completion_lock); |
b60c8dce | 8157 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 8158 | ctx->cq_extra++; |
b60c8dce | 8159 | io_commit_cqring(ctx); |
79ebeaee | 8160 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8161 | io_cqring_ev_posted(ctx); |
8162 | io_ring_submit_unlock(ctx, lock_ring); | |
8163 | } | |
8164 | ||
40ae0ff7 | 8165 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8166 | kfree(prsrc); |
65e19f54 | 8167 | } |
05589553 | 8168 | |
28a9fe25 | 8169 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8170 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8171 | complete(&rsrc_data->done); | |
2faf852d | 8172 | } |
65e19f54 | 8173 | |
269bbe5f | 8174 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8175 | { |
8176 | struct io_ring_ctx *ctx; | |
8177 | struct llist_node *node; | |
8178 | ||
269bbe5f BM |
8179 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8180 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8181 | |
8182 | while (node) { | |
b895c9a6 | 8183 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8184 | struct llist_node *next = node->next; |
8185 | ||
b895c9a6 | 8186 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8187 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8188 | node = next; |
8189 | } | |
8190 | } | |
8191 | ||
6b06314c | 8192 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8193 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8194 | { |
8195 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8196 | struct file *file; |
f3baed39 | 8197 | int fd, ret; |
846a4ef2 | 8198 | unsigned i; |
6b06314c | 8199 | |
05f3fb3c | 8200 | if (ctx->file_data) |
6b06314c JA |
8201 | return -EBUSY; |
8202 | if (!nr_args) | |
8203 | return -EINVAL; | |
8204 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8205 | return -EMFILE; | |
3a1b8a4e PB |
8206 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8207 | return -EMFILE; | |
a7f0ed5a | 8208 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8209 | if (ret) |
8210 | return ret; | |
d878c816 PB |
8211 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8212 | &ctx->file_data); | |
8213 | if (ret) | |
8214 | return ret; | |
6b06314c | 8215 | |
f3baed39 | 8216 | ret = -ENOMEM; |
aeca241b | 8217 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8218 | goto out_free; |
65e19f54 | 8219 | |
08a45173 | 8220 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8221 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8222 | ret = -EFAULT; |
8223 | goto out_fput; | |
8224 | } | |
08a45173 | 8225 | /* allow sparse sets */ |
792e3582 PB |
8226 | if (fd == -1) { |
8227 | ret = -EINVAL; | |
2d091d62 | 8228 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8229 | goto out_fput; |
08a45173 | 8230 | continue; |
792e3582 | 8231 | } |
6b06314c | 8232 | |
05f3fb3c | 8233 | file = fget(fd); |
6b06314c | 8234 | ret = -EBADF; |
792e3582 | 8235 | if (unlikely(!file)) |
600cf3f8 | 8236 | goto out_fput; |
05f3fb3c | 8237 | |
6b06314c JA |
8238 | /* |
8239 | * Don't allow io_uring instances to be registered. If UNIX | |
8240 | * isn't enabled, then this causes a reference cycle and this | |
8241 | * instance can never get freed. If UNIX is enabled we'll | |
8242 | * handle it just fine, but there's still no point in allowing | |
8243 | * a ring fd as it doesn't support regular read/write anyway. | |
8244 | */ | |
05f3fb3c JA |
8245 | if (file->f_op == &io_uring_fops) { |
8246 | fput(file); | |
600cf3f8 | 8247 | goto out_fput; |
6b06314c | 8248 | } |
aeca241b | 8249 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8250 | } |
8251 | ||
6b06314c | 8252 | ret = io_sqe_files_scm(ctx); |
05589553 | 8253 | if (ret) { |
08480400 | 8254 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8255 | return ret; |
8256 | } | |
6b06314c | 8257 | |
a7f0ed5a | 8258 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8259 | return ret; |
600cf3f8 PB |
8260 | out_fput: |
8261 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8262 | file = io_file_from_index(ctx, i); | |
8263 | if (file) | |
8264 | fput(file); | |
8265 | } | |
042b0d85 | 8266 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8267 | ctx->nr_user_files = 0; |
600cf3f8 | 8268 | out_free: |
44b31f2f | 8269 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8270 | ctx->file_data = NULL; |
6b06314c JA |
8271 | return ret; |
8272 | } | |
8273 | ||
c3a31e60 JA |
8274 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8275 | int index) | |
8276 | { | |
8277 | #if defined(CONFIG_UNIX) | |
8278 | struct sock *sock = ctx->ring_sock->sk; | |
8279 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8280 | struct sk_buff *skb; | |
8281 | ||
8282 | /* | |
8283 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8284 | * file set. If there's no room, fall back to allocating a new skb | |
8285 | * and filling it in. | |
8286 | */ | |
8287 | spin_lock_irq(&head->lock); | |
8288 | skb = skb_peek(head); | |
8289 | if (skb) { | |
8290 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8291 | ||
8292 | if (fpl->count < SCM_MAX_FD) { | |
8293 | __skb_unlink(skb, head); | |
8294 | spin_unlock_irq(&head->lock); | |
8295 | fpl->fp[fpl->count] = get_file(file); | |
8296 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8297 | fpl->count++; | |
8298 | spin_lock_irq(&head->lock); | |
8299 | __skb_queue_head(head, skb); | |
8300 | } else { | |
8301 | skb = NULL; | |
8302 | } | |
8303 | } | |
8304 | spin_unlock_irq(&head->lock); | |
8305 | ||
8306 | if (skb) { | |
8307 | fput(file); | |
8308 | return 0; | |
8309 | } | |
8310 | ||
8311 | return __io_sqe_files_scm(ctx, 1, index); | |
8312 | #else | |
8313 | return 0; | |
8314 | #endif | |
8315 | } | |
8316 | ||
9c7b0ba8 PB |
8317 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8318 | struct io_rsrc_node *node, void *rsrc) | |
8319 | { | |
8320 | struct io_rsrc_put *prsrc; | |
8321 | ||
8322 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8323 | if (!prsrc) | |
8324 | return -ENOMEM; | |
8325 | ||
8326 | prsrc->tag = *io_get_tag_slot(data, idx); | |
8327 | prsrc->rsrc = rsrc; | |
8328 | list_add(&prsrc->list, &node->rsrc_list); | |
8329 | return 0; | |
8330 | } | |
8331 | ||
b9445598 PB |
8332 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8333 | unsigned int issue_flags, u32 slot_index) | |
8334 | { | |
8335 | struct io_ring_ctx *ctx = req->ctx; | |
8336 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
9c7b0ba8 | 8337 | bool needs_switch = false; |
b9445598 PB |
8338 | struct io_fixed_file *file_slot; |
8339 | int ret = -EBADF; | |
8340 | ||
8341 | io_ring_submit_lock(ctx, !force_nonblock); | |
8342 | if (file->f_op == &io_uring_fops) | |
8343 | goto err; | |
8344 | ret = -ENXIO; | |
8345 | if (!ctx->file_data) | |
8346 | goto err; | |
8347 | ret = -EINVAL; | |
8348 | if (slot_index >= ctx->nr_user_files) | |
8349 | goto err; | |
8350 | ||
8351 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8352 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8353 | |
8354 | if (file_slot->file_ptr) { | |
8355 | struct file *old_file; | |
8356 | ||
8357 | ret = io_rsrc_node_switch_start(ctx); | |
8358 | if (ret) | |
8359 | goto err; | |
8360 | ||
8361 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8362 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8363 | ctx->rsrc_node, old_file); | |
8364 | if (ret) | |
8365 | goto err; | |
8366 | file_slot->file_ptr = 0; | |
8367 | needs_switch = true; | |
8368 | } | |
b9445598 PB |
8369 | |
8370 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8371 | io_fixed_file_set(file_slot, file); | |
8372 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8373 | if (ret) { | |
8374 | file_slot->file_ptr = 0; | |
8375 | goto err; | |
8376 | } | |
8377 | ||
8378 | ret = 0; | |
8379 | err: | |
9c7b0ba8 PB |
8380 | if (needs_switch) |
8381 | io_rsrc_node_switch(ctx, ctx->file_data); | |
b9445598 PB |
8382 | io_ring_submit_unlock(ctx, !force_nonblock); |
8383 | if (ret) | |
8384 | fput(file); | |
8385 | return ret; | |
8386 | } | |
8387 | ||
7df778be PB |
8388 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
8389 | { | |
8390 | unsigned int offset = req->close.file_slot - 1; | |
8391 | struct io_ring_ctx *ctx = req->ctx; | |
8392 | struct io_fixed_file *file_slot; | |
8393 | struct file *file; | |
8394 | int ret, i; | |
8395 | ||
8396 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
8397 | ret = -ENXIO; | |
8398 | if (unlikely(!ctx->file_data)) | |
8399 | goto out; | |
8400 | ret = -EINVAL; | |
8401 | if (offset >= ctx->nr_user_files) | |
8402 | goto out; | |
8403 | ret = io_rsrc_node_switch_start(ctx); | |
8404 | if (ret) | |
8405 | goto out; | |
8406 | ||
8407 | i = array_index_nospec(offset, ctx->nr_user_files); | |
8408 | file_slot = io_fixed_file_slot(&ctx->file_table, i); | |
8409 | ret = -EBADF; | |
8410 | if (!file_slot->file_ptr) | |
8411 | goto out; | |
8412 | ||
8413 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8414 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
8415 | if (ret) | |
8416 | goto out; | |
8417 | ||
8418 | file_slot->file_ptr = 0; | |
8419 | io_rsrc_node_switch(ctx, ctx->file_data); | |
8420 | ret = 0; | |
8421 | out: | |
8422 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
8423 | return ret; | |
8424 | } | |
8425 | ||
05f3fb3c | 8426 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 8427 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8428 | unsigned nr_args) |
8429 | { | |
c3bdad02 | 8430 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8431 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8432 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8433 | struct io_fixed_file *file_slot; |
8434 | struct file *file; | |
98f0b3b4 PB |
8435 | int fd, i, err = 0; |
8436 | unsigned int done; | |
05589553 | 8437 | bool needs_switch = false; |
c3a31e60 | 8438 | |
98f0b3b4 PB |
8439 | if (!ctx->file_data) |
8440 | return -ENXIO; | |
8441 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8442 | return -EINVAL; |
8443 | ||
67973b93 | 8444 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8445 | u64 tag = 0; |
8446 | ||
8447 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8448 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8449 | err = -EFAULT; |
8450 | break; | |
8451 | } | |
c3bdad02 PB |
8452 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8453 | err = -EINVAL; | |
8454 | break; | |
8455 | } | |
4e0377a1 | 8456 | if (fd == IORING_REGISTER_FILES_SKIP) |
8457 | continue; | |
8458 | ||
67973b93 | 8459 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8460 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8461 | |
a04b0ac0 PB |
8462 | if (file_slot->file_ptr) { |
8463 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8464 | err = io_queue_rsrc_removal(data, up->offset + done, |
8465 | ctx->rsrc_node, file); | |
a5318d3c HD |
8466 | if (err) |
8467 | break; | |
a04b0ac0 | 8468 | file_slot->file_ptr = 0; |
05589553 | 8469 | needs_switch = true; |
c3a31e60 JA |
8470 | } |
8471 | if (fd != -1) { | |
c3a31e60 JA |
8472 | file = fget(fd); |
8473 | if (!file) { | |
8474 | err = -EBADF; | |
8475 | break; | |
8476 | } | |
8477 | /* | |
8478 | * Don't allow io_uring instances to be registered. If | |
8479 | * UNIX isn't enabled, then this causes a reference | |
8480 | * cycle and this instance can never get freed. If UNIX | |
8481 | * is enabled we'll handle it just fine, but there's | |
8482 | * still no point in allowing a ring fd as it doesn't | |
8483 | * support regular read/write anyway. | |
8484 | */ | |
8485 | if (file->f_op == &io_uring_fops) { | |
8486 | fput(file); | |
8487 | err = -EBADF; | |
8488 | break; | |
8489 | } | |
2d091d62 | 8490 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8491 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8492 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8493 | if (err) { |
a04b0ac0 | 8494 | file_slot->file_ptr = 0; |
f3bd9dae | 8495 | fput(file); |
c3a31e60 | 8496 | break; |
f3bd9dae | 8497 | } |
c3a31e60 | 8498 | } |
05f3fb3c JA |
8499 | } |
8500 | ||
a7f0ed5a PB |
8501 | if (needs_switch) |
8502 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8503 | return done ? done : err; |
8504 | } | |
05589553 | 8505 | |
685fe7fe JA |
8506 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8507 | struct task_struct *task) | |
24369c2e | 8508 | { |
e941894e | 8509 | struct io_wq_hash *hash; |
24369c2e | 8510 | struct io_wq_data data; |
24369c2e | 8511 | unsigned int concurrency; |
24369c2e | 8512 | |
362a9e65 | 8513 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8514 | hash = ctx->hash_map; |
8515 | if (!hash) { | |
8516 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8517 | if (!hash) { |
8518 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8519 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8520 | } |
e941894e JA |
8521 | refcount_set(&hash->refs, 1); |
8522 | init_waitqueue_head(&hash->wait); | |
8523 | ctx->hash_map = hash; | |
24369c2e | 8524 | } |
362a9e65 | 8525 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8526 | |
e941894e | 8527 | data.hash = hash; |
685fe7fe | 8528 | data.task = task; |
ebc11b6c | 8529 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8530 | data.do_work = io_wq_submit_work; |
24369c2e | 8531 | |
d25e3a3d JA |
8532 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8533 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8534 | |
5aa75ed5 | 8535 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8536 | } |
8537 | ||
c072481d PB |
8538 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
8539 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8540 | { |
8541 | struct io_uring_task *tctx; | |
d8a6df10 | 8542 | int ret; |
0f212204 | 8543 | |
09899b19 | 8544 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8545 | if (unlikely(!tctx)) |
8546 | return -ENOMEM; | |
8547 | ||
d8a6df10 JA |
8548 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8549 | if (unlikely(ret)) { | |
8550 | kfree(tctx); | |
8551 | return ret; | |
8552 | } | |
8553 | ||
685fe7fe | 8554 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8555 | if (IS_ERR(tctx->io_wq)) { |
8556 | ret = PTR_ERR(tctx->io_wq); | |
8557 | percpu_counter_destroy(&tctx->inflight); | |
8558 | kfree(tctx); | |
8559 | return ret; | |
8560 | } | |
8561 | ||
0f212204 JA |
8562 | xa_init(&tctx->xa); |
8563 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8564 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8565 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8566 | task->io_uring = tctx; |
7cbf1722 JA |
8567 | spin_lock_init(&tctx->task_lock); |
8568 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8569 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8570 | return 0; |
8571 | } | |
8572 | ||
8573 | void __io_uring_free(struct task_struct *tsk) | |
8574 | { | |
8575 | struct io_uring_task *tctx = tsk->io_uring; | |
8576 | ||
8577 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8578 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8579 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8580 | |
d8a6df10 | 8581 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8582 | kfree(tctx); |
8583 | tsk->io_uring = NULL; | |
8584 | } | |
8585 | ||
c072481d PB |
8586 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
8587 | struct io_uring_params *p) | |
2b188cc1 JA |
8588 | { |
8589 | int ret; | |
8590 | ||
d25e3a3d JA |
8591 | /* Retain compatibility with failing for an invalid attach attempt */ |
8592 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8593 | IORING_SETUP_ATTACH_WQ) { | |
8594 | struct fd f; | |
8595 | ||
8596 | f = fdget(p->wq_fd); | |
8597 | if (!f.file) | |
8598 | return -ENXIO; | |
0cc936f7 JA |
8599 | if (f.file->f_op != &io_uring_fops) { |
8600 | fdput(f); | |
f2a48dd0 | 8601 | return -EINVAL; |
0cc936f7 JA |
8602 | } |
8603 | fdput(f); | |
d25e3a3d | 8604 | } |
6c271ce2 | 8605 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8606 | struct task_struct *tsk; |
534ca6d6 | 8607 | struct io_sq_data *sqd; |
26984fbf | 8608 | bool attached; |
534ca6d6 | 8609 | |
26984fbf | 8610 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8611 | if (IS_ERR(sqd)) { |
8612 | ret = PTR_ERR(sqd); | |
8613 | goto err; | |
8614 | } | |
69fb2131 | 8615 | |
7c30f36a | 8616 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8617 | ctx->sq_data = sqd; |
917257da JA |
8618 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8619 | if (!ctx->sq_thread_idle) | |
8620 | ctx->sq_thread_idle = HZ; | |
8621 | ||
78d7f6ba | 8622 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8623 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8624 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8625 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8626 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8627 | io_sq_thread_unpark(sqd); |
8628 | ||
de75a3d3 PB |
8629 | if (ret < 0) |
8630 | goto err; | |
8631 | if (attached) | |
5aa75ed5 | 8632 | return 0; |
aa06165d | 8633 | |
6c271ce2 | 8634 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8635 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8636 | |
917257da | 8637 | ret = -EINVAL; |
f2a48dd0 | 8638 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8639 | goto err_sqpoll; |
37d1e2e3 | 8640 | sqd->sq_cpu = cpu; |
6c271ce2 | 8641 | } else { |
37d1e2e3 | 8642 | sqd->sq_cpu = -1; |
6c271ce2 | 8643 | } |
37d1e2e3 JA |
8644 | |
8645 | sqd->task_pid = current->pid; | |
5c2469e0 | 8646 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8647 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8648 | if (IS_ERR(tsk)) { | |
8649 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8650 | goto err_sqpoll; |
6c271ce2 | 8651 | } |
97a73a0f | 8652 | |
46fe18b1 | 8653 | sqd->thread = tsk; |
97a73a0f | 8654 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8655 | wake_up_new_task(tsk); |
0f212204 JA |
8656 | if (ret) |
8657 | goto err; | |
6c271ce2 JA |
8658 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8659 | /* Can't have SQ_AFF without SQPOLL */ | |
8660 | ret = -EINVAL; | |
8661 | goto err; | |
8662 | } | |
8663 | ||
2b188cc1 | 8664 | return 0; |
f2a48dd0 PB |
8665 | err_sqpoll: |
8666 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8667 | err: |
37d1e2e3 | 8668 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8669 | return ret; |
8670 | } | |
8671 | ||
a087e2b5 BM |
8672 | static inline void __io_unaccount_mem(struct user_struct *user, |
8673 | unsigned long nr_pages) | |
2b188cc1 JA |
8674 | { |
8675 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8676 | } | |
8677 | ||
a087e2b5 BM |
8678 | static inline int __io_account_mem(struct user_struct *user, |
8679 | unsigned long nr_pages) | |
2b188cc1 JA |
8680 | { |
8681 | unsigned long page_limit, cur_pages, new_pages; | |
8682 | ||
8683 | /* Don't allow more pages than we can safely lock */ | |
8684 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8685 | ||
8686 | do { | |
8687 | cur_pages = atomic_long_read(&user->locked_vm); | |
8688 | new_pages = cur_pages + nr_pages; | |
8689 | if (new_pages > page_limit) | |
8690 | return -ENOMEM; | |
8691 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8692 | new_pages) != cur_pages); | |
8693 | ||
8694 | return 0; | |
8695 | } | |
8696 | ||
26bfa89e | 8697 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8698 | { |
62e398be | 8699 | if (ctx->user) |
a087e2b5 | 8700 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8701 | |
26bfa89e JA |
8702 | if (ctx->mm_account) |
8703 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8704 | } |
8705 | ||
26bfa89e | 8706 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8707 | { |
30975825 BM |
8708 | int ret; |
8709 | ||
62e398be | 8710 | if (ctx->user) { |
30975825 BM |
8711 | ret = __io_account_mem(ctx->user, nr_pages); |
8712 | if (ret) | |
8713 | return ret; | |
8714 | } | |
8715 | ||
26bfa89e JA |
8716 | if (ctx->mm_account) |
8717 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8718 | |
8719 | return 0; | |
8720 | } | |
8721 | ||
2b188cc1 JA |
8722 | static void io_mem_free(void *ptr) |
8723 | { | |
52e04ef4 MR |
8724 | struct page *page; |
8725 | ||
8726 | if (!ptr) | |
8727 | return; | |
2b188cc1 | 8728 | |
52e04ef4 | 8729 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8730 | if (put_page_testzero(page)) |
8731 | free_compound_page(page); | |
8732 | } | |
8733 | ||
8734 | static void *io_mem_alloc(size_t size) | |
8735 | { | |
8736 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8737 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8738 | |
8739 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8740 | } | |
8741 | ||
75b28aff HV |
8742 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8743 | size_t *sq_offset) | |
8744 | { | |
8745 | struct io_rings *rings; | |
8746 | size_t off, sq_array_size; | |
8747 | ||
8748 | off = struct_size(rings, cqes, cq_entries); | |
8749 | if (off == SIZE_MAX) | |
8750 | return SIZE_MAX; | |
8751 | ||
8752 | #ifdef CONFIG_SMP | |
8753 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8754 | if (off == 0) | |
8755 | return SIZE_MAX; | |
8756 | #endif | |
8757 | ||
b36200f5 DV |
8758 | if (sq_offset) |
8759 | *sq_offset = off; | |
8760 | ||
75b28aff HV |
8761 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8762 | if (sq_array_size == SIZE_MAX) | |
8763 | return SIZE_MAX; | |
8764 | ||
8765 | if (check_add_overflow(off, sq_array_size, &off)) | |
8766 | return SIZE_MAX; | |
8767 | ||
75b28aff HV |
8768 | return off; |
8769 | } | |
8770 | ||
41edf1a5 | 8771 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8772 | { |
41edf1a5 | 8773 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8774 | unsigned int i; |
8775 | ||
6224843d PB |
8776 | if (imu != ctx->dummy_ubuf) { |
8777 | for (i = 0; i < imu->nr_bvecs; i++) | |
8778 | unpin_user_page(imu->bvec[i].bv_page); | |
8779 | if (imu->acct_pages) | |
8780 | io_unaccount_mem(ctx, imu->acct_pages); | |
8781 | kvfree(imu); | |
8782 | } | |
41edf1a5 | 8783 | *slot = NULL; |
7f61a1e9 PB |
8784 | } |
8785 | ||
bd54b6fe | 8786 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8787 | { |
634d00df PB |
8788 | io_buffer_unmap(ctx, &prsrc->buf); |
8789 | prsrc->buf = NULL; | |
bd54b6fe | 8790 | } |
edafccee | 8791 | |
bd54b6fe BM |
8792 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8793 | { | |
8794 | unsigned int i; | |
edafccee | 8795 | |
7f61a1e9 PB |
8796 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8797 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8798 | kfree(ctx->user_bufs); |
bb6659cc | 8799 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8800 | ctx->user_bufs = NULL; |
bd54b6fe | 8801 | ctx->buf_data = NULL; |
edafccee | 8802 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8803 | } |
8804 | ||
0a96bbe4 | 8805 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8806 | { |
bd54b6fe | 8807 | int ret; |
edafccee | 8808 | |
bd54b6fe | 8809 | if (!ctx->buf_data) |
edafccee JA |
8810 | return -ENXIO; |
8811 | ||
bd54b6fe BM |
8812 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8813 | if (!ret) | |
8814 | __io_sqe_buffers_unregister(ctx); | |
8815 | return ret; | |
edafccee JA |
8816 | } |
8817 | ||
8818 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8819 | void __user *arg, unsigned index) | |
8820 | { | |
8821 | struct iovec __user *src; | |
8822 | ||
8823 | #ifdef CONFIG_COMPAT | |
8824 | if (ctx->compat) { | |
8825 | struct compat_iovec __user *ciovs; | |
8826 | struct compat_iovec ciov; | |
8827 | ||
8828 | ciovs = (struct compat_iovec __user *) arg; | |
8829 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8830 | return -EFAULT; | |
8831 | ||
d55e5f5b | 8832 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8833 | dst->iov_len = ciov.iov_len; |
8834 | return 0; | |
8835 | } | |
8836 | #endif | |
8837 | src = (struct iovec __user *) arg; | |
8838 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8839 | return -EFAULT; | |
8840 | return 0; | |
8841 | } | |
8842 | ||
de293938 JA |
8843 | /* |
8844 | * Not super efficient, but this is just a registration time. And we do cache | |
8845 | * the last compound head, so generally we'll only do a full search if we don't | |
8846 | * match that one. | |
8847 | * | |
8848 | * We check if the given compound head page has already been accounted, to | |
8849 | * avoid double accounting it. This allows us to account the full size of the | |
8850 | * page, not just the constituent pages of a huge page. | |
8851 | */ | |
8852 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8853 | int nr_pages, struct page *hpage) | |
8854 | { | |
8855 | int i, j; | |
8856 | ||
8857 | /* check current page array */ | |
8858 | for (i = 0; i < nr_pages; i++) { | |
8859 | if (!PageCompound(pages[i])) | |
8860 | continue; | |
8861 | if (compound_head(pages[i]) == hpage) | |
8862 | return true; | |
8863 | } | |
8864 | ||
8865 | /* check previously registered pages */ | |
8866 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8867 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8868 | |
8869 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8870 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8871 | continue; | |
8872 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8873 | return true; | |
8874 | } | |
8875 | } | |
8876 | ||
8877 | return false; | |
8878 | } | |
8879 | ||
8880 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8881 | int nr_pages, struct io_mapped_ubuf *imu, | |
8882 | struct page **last_hpage) | |
8883 | { | |
8884 | int i, ret; | |
8885 | ||
216e5835 | 8886 | imu->acct_pages = 0; |
de293938 JA |
8887 | for (i = 0; i < nr_pages; i++) { |
8888 | if (!PageCompound(pages[i])) { | |
8889 | imu->acct_pages++; | |
8890 | } else { | |
8891 | struct page *hpage; | |
8892 | ||
8893 | hpage = compound_head(pages[i]); | |
8894 | if (hpage == *last_hpage) | |
8895 | continue; | |
8896 | *last_hpage = hpage; | |
8897 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8898 | continue; | |
8899 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8900 | } | |
8901 | } | |
8902 | ||
8903 | if (!imu->acct_pages) | |
8904 | return 0; | |
8905 | ||
26bfa89e | 8906 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8907 | if (ret) |
8908 | imu->acct_pages = 0; | |
8909 | return ret; | |
8910 | } | |
8911 | ||
0a96bbe4 | 8912 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8913 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8914 | struct page **last_hpage) |
edafccee | 8915 | { |
41edf1a5 | 8916 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8917 | struct vm_area_struct **vmas = NULL; |
8918 | struct page **pages = NULL; | |
0a96bbe4 BM |
8919 | unsigned long off, start, end, ubuf; |
8920 | size_t size; | |
8921 | int ret, pret, nr_pages, i; | |
8922 | ||
6224843d PB |
8923 | if (!iov->iov_base) { |
8924 | *pimu = ctx->dummy_ubuf; | |
8925 | return 0; | |
8926 | } | |
8927 | ||
0a96bbe4 BM |
8928 | ubuf = (unsigned long) iov->iov_base; |
8929 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8930 | start = ubuf >> PAGE_SHIFT; | |
8931 | nr_pages = end - start; | |
8932 | ||
41edf1a5 | 8933 | *pimu = NULL; |
0a96bbe4 BM |
8934 | ret = -ENOMEM; |
8935 | ||
8936 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8937 | if (!pages) | |
8938 | goto done; | |
8939 | ||
8940 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8941 | GFP_KERNEL); | |
8942 | if (!vmas) | |
8943 | goto done; | |
edafccee | 8944 | |
41edf1a5 | 8945 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8946 | if (!imu) |
0a96bbe4 BM |
8947 | goto done; |
8948 | ||
8949 | ret = 0; | |
8950 | mmap_read_lock(current->mm); | |
8951 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8952 | pages, vmas); | |
8953 | if (pret == nr_pages) { | |
8954 | /* don't support file backed memory */ | |
8955 | for (i = 0; i < nr_pages; i++) { | |
8956 | struct vm_area_struct *vma = vmas[i]; | |
8957 | ||
40dad765 PB |
8958 | if (vma_is_shmem(vma)) |
8959 | continue; | |
0a96bbe4 BM |
8960 | if (vma->vm_file && |
8961 | !is_file_hugepages(vma->vm_file)) { | |
8962 | ret = -EOPNOTSUPP; | |
8963 | break; | |
8964 | } | |
8965 | } | |
8966 | } else { | |
8967 | ret = pret < 0 ? pret : -EFAULT; | |
8968 | } | |
8969 | mmap_read_unlock(current->mm); | |
8970 | if (ret) { | |
8971 | /* | |
8972 | * if we did partial map, or found file backed vmas, | |
8973 | * release any pages we did get | |
8974 | */ | |
8975 | if (pret > 0) | |
8976 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8977 | goto done; |
8978 | } | |
8979 | ||
8980 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8981 | if (ret) { | |
8982 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8983 | goto done; |
8984 | } | |
8985 | ||
8986 | off = ubuf & ~PAGE_MASK; | |
8987 | size = iov->iov_len; | |
8988 | for (i = 0; i < nr_pages; i++) { | |
8989 | size_t vec_len; | |
8990 | ||
8991 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8992 | imu->bvec[i].bv_page = pages[i]; | |
8993 | imu->bvec[i].bv_len = vec_len; | |
8994 | imu->bvec[i].bv_offset = off; | |
8995 | off = 0; | |
8996 | size -= vec_len; | |
8997 | } | |
8998 | /* store original address for later verification */ | |
8999 | imu->ubuf = ubuf; | |
4751f53d | 9000 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 9001 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 9002 | *pimu = imu; |
0a96bbe4 BM |
9003 | ret = 0; |
9004 | done: | |
41edf1a5 PB |
9005 | if (ret) |
9006 | kvfree(imu); | |
0a96bbe4 BM |
9007 | kvfree(pages); |
9008 | kvfree(vmas); | |
9009 | return ret; | |
9010 | } | |
9011 | ||
2b358604 | 9012 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 9013 | { |
87094465 PB |
9014 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
9015 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9016 | } |
edafccee | 9017 | |
2b358604 BM |
9018 | static int io_buffer_validate(struct iovec *iov) |
9019 | { | |
50e96989 PB |
9020 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9021 | ||
2b358604 BM |
9022 | /* |
9023 | * Don't impose further limits on the size and buffer | |
9024 | * constraints here, we'll -EINVAL later when IO is | |
9025 | * submitted if they are wrong. | |
9026 | */ | |
6224843d PB |
9027 | if (!iov->iov_base) |
9028 | return iov->iov_len ? -EFAULT : 0; | |
9029 | if (!iov->iov_len) | |
2b358604 | 9030 | return -EFAULT; |
edafccee | 9031 | |
2b358604 BM |
9032 | /* arbitrary limit, but we need something */ |
9033 | if (iov->iov_len > SZ_1G) | |
9034 | return -EFAULT; | |
edafccee | 9035 | |
50e96989 PB |
9036 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9037 | return -EOVERFLOW; | |
9038 | ||
2b358604 BM |
9039 | return 0; |
9040 | } | |
edafccee | 9041 | |
2b358604 | 9042 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9043 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9044 | { |
bd54b6fe BM |
9045 | struct page *last_hpage = NULL; |
9046 | struct io_rsrc_data *data; | |
2b358604 BM |
9047 | int i, ret; |
9048 | struct iovec iov; | |
edafccee | 9049 | |
87094465 PB |
9050 | if (ctx->user_bufs) |
9051 | return -EBUSY; | |
489809e2 | 9052 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9053 | return -EINVAL; |
bd54b6fe | 9054 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9055 | if (ret) |
9056 | return ret; | |
d878c816 PB |
9057 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9058 | if (ret) | |
9059 | return ret; | |
bd54b6fe BM |
9060 | ret = io_buffers_map_alloc(ctx, nr_args); |
9061 | if (ret) { | |
bb6659cc | 9062 | io_rsrc_data_free(data); |
bd54b6fe BM |
9063 | return ret; |
9064 | } | |
edafccee | 9065 | |
87094465 | 9066 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9067 | ret = io_copy_iov(ctx, &iov, arg, i); |
9068 | if (ret) | |
0a96bbe4 | 9069 | break; |
2b358604 BM |
9070 | ret = io_buffer_validate(&iov); |
9071 | if (ret) | |
0a96bbe4 | 9072 | break; |
2d091d62 | 9073 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9074 | ret = -EINVAL; |
9075 | break; | |
9076 | } | |
edafccee | 9077 | |
41edf1a5 PB |
9078 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9079 | &last_hpage); | |
0a96bbe4 BM |
9080 | if (ret) |
9081 | break; | |
edafccee | 9082 | } |
0a96bbe4 | 9083 | |
bd54b6fe | 9084 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9085 | |
bd54b6fe BM |
9086 | ctx->buf_data = data; |
9087 | if (ret) | |
9088 | __io_sqe_buffers_unregister(ctx); | |
9089 | else | |
9090 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9091 | return ret; |
9092 | } | |
9093 | ||
634d00df PB |
9094 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9095 | struct io_uring_rsrc_update2 *up, | |
9096 | unsigned int nr_args) | |
9097 | { | |
9098 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9099 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9100 | struct page *last_hpage = NULL; |
9101 | bool needs_switch = false; | |
9102 | __u32 done; | |
9103 | int i, err; | |
9104 | ||
9105 | if (!ctx->buf_data) | |
9106 | return -ENXIO; | |
9107 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9108 | return -EINVAL; | |
9109 | ||
9110 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9111 | struct io_mapped_ubuf *imu; |
9112 | int offset = up->offset + done; | |
634d00df PB |
9113 | u64 tag = 0; |
9114 | ||
9115 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9116 | if (err) | |
9117 | break; | |
9118 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9119 | err = -EFAULT; | |
9120 | break; | |
9121 | } | |
0b8c0e7c PB |
9122 | err = io_buffer_validate(&iov); |
9123 | if (err) | |
9124 | break; | |
cf3770e7 CIK |
9125 | if (!iov.iov_base && tag) { |
9126 | err = -EINVAL; | |
9127 | break; | |
9128 | } | |
0b8c0e7c PB |
9129 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9130 | if (err) | |
9131 | break; | |
634d00df | 9132 | |
0b8c0e7c | 9133 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9134 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
9135 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
9136 | ctx->rsrc_node, ctx->user_bufs[i]); | |
9137 | if (unlikely(err)) { | |
9138 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9139 | break; |
0b8c0e7c | 9140 | } |
634d00df PB |
9141 | ctx->user_bufs[i] = NULL; |
9142 | needs_switch = true; | |
9143 | } | |
9144 | ||
0b8c0e7c | 9145 | ctx->user_bufs[i] = imu; |
2d091d62 | 9146 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9147 | } |
9148 | ||
9149 | if (needs_switch) | |
9150 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9151 | return done ? done : err; | |
9152 | } | |
9153 | ||
9b402849 JA |
9154 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
9155 | { | |
9156 | __s32 __user *fds = arg; | |
9157 | int fd; | |
9158 | ||
9159 | if (ctx->cq_ev_fd) | |
9160 | return -EBUSY; | |
9161 | ||
9162 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9163 | return -EFAULT; | |
9164 | ||
9165 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
9166 | if (IS_ERR(ctx->cq_ev_fd)) { | |
9167 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 9168 | |
9b402849 JA |
9169 | ctx->cq_ev_fd = NULL; |
9170 | return ret; | |
9171 | } | |
9172 | ||
9173 | return 0; | |
9174 | } | |
9175 | ||
9176 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9177 | { | |
9178 | if (ctx->cq_ev_fd) { | |
9179 | eventfd_ctx_put(ctx->cq_ev_fd); | |
9180 | ctx->cq_ev_fd = NULL; | |
9181 | return 0; | |
9182 | } | |
9183 | ||
9184 | return -ENXIO; | |
9185 | } | |
9186 | ||
5a2e745d JA |
9187 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9188 | { | |
9e15c3a0 JA |
9189 | struct io_buffer *buf; |
9190 | unsigned long index; | |
9191 | ||
8bab4c09 | 9192 | xa_for_each(&ctx->io_buffers, index, buf) { |
9e15c3a0 | 9193 | __io_remove_buffers(ctx, buf, index, -1U); |
8bab4c09 JA |
9194 | cond_resched(); |
9195 | } | |
5a2e745d JA |
9196 | } |
9197 | ||
4010fec4 | 9198 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9199 | { |
cd0ca2e0 | 9200 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 9201 | int nr = 0; |
bf019da7 | 9202 | |
9a4fdbd8 | 9203 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 9204 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc PB |
9205 | |
9206 | while (state->free_list.next) { | |
9207 | struct io_wq_work_node *node; | |
9208 | struct io_kiocb *req; | |
9209 | ||
9210 | node = wq_stack_extract(&state->free_list); | |
9211 | req = container_of(node, struct io_kiocb, comp_list); | |
9212 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 9213 | nr++; |
c2b6c6bc | 9214 | } |
37f0e767 PB |
9215 | if (nr) |
9216 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
9217 | mutex_unlock(&ctx->uring_lock); |
9218 | } | |
9219 | ||
43597aac | 9220 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9221 | { |
43597aac | 9222 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9223 | wait_for_completion(&data->done); |
bd54b6fe | 9224 | } |
04fc6c80 | 9225 | |
c072481d | 9226 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9227 | { |
37d1e2e3 | 9228 | io_sq_thread_finish(ctx); |
2aede0e4 | 9229 | |
37d1e2e3 | 9230 | if (ctx->mm_account) { |
2aede0e4 JA |
9231 | mmdrop(ctx->mm_account); |
9232 | ctx->mm_account = NULL; | |
30975825 | 9233 | } |
def596e9 | 9234 | |
ab409402 | 9235 | io_rsrc_refs_drop(ctx); |
43597aac PB |
9236 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9237 | io_wait_rsrc_data(ctx->buf_data); | |
9238 | io_wait_rsrc_data(ctx->file_data); | |
9239 | ||
8bad28d8 | 9240 | mutex_lock(&ctx->uring_lock); |
43597aac | 9241 | if (ctx->buf_data) |
bd54b6fe | 9242 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9243 | if (ctx->file_data) |
08480400 | 9244 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9245 | if (ctx->rings) |
9246 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 9247 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 9248 | io_eventfd_unregister(ctx); |
5a2e745d | 9249 | io_destroy_buffers(ctx); |
07db298a PB |
9250 | if (ctx->sq_creds) |
9251 | put_cred(ctx->sq_creds); | |
def596e9 | 9252 | |
a7f0ed5a PB |
9253 | /* there are no registered resources left, nobody uses it */ |
9254 | if (ctx->rsrc_node) | |
9255 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9256 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9257 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 9258 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 9259 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
9260 | |
9261 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9262 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9263 | |
2b188cc1 | 9264 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9265 | if (ctx->ring_sock) { |
9266 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9267 | sock_release(ctx->ring_sock); |
355e8d26 | 9268 | } |
2b188cc1 | 9269 | #endif |
ef9dd637 | 9270 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9271 | |
75b28aff | 9272 | io_mem_free(ctx->rings); |
2b188cc1 | 9273 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9274 | |
9275 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9276 | free_uid(ctx->user); |
4010fec4 | 9277 | io_req_caches_free(ctx); |
e941894e JA |
9278 | if (ctx->hash_map) |
9279 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9280 | kfree(ctx->cancel_hash); |
6224843d | 9281 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
9282 | kfree(ctx); |
9283 | } | |
9284 | ||
9285 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9286 | { | |
9287 | struct io_ring_ctx *ctx = file->private_data; | |
9288 | __poll_t mask = 0; | |
9289 | ||
d60aa65b | 9290 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
9291 | /* |
9292 | * synchronizes with barrier from wq_has_sleeper call in | |
9293 | * io_commit_cqring | |
9294 | */ | |
2b188cc1 | 9295 | smp_rmb(); |
90554200 | 9296 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9297 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9298 | |
9299 | /* | |
9300 | * Don't flush cqring overflow list here, just do a simple check. | |
9301 | * Otherwise there could possible be ABBA deadlock: | |
9302 | * CPU0 CPU1 | |
9303 | * ---- ---- | |
9304 | * lock(&ctx->uring_lock); | |
9305 | * lock(&ep->mtx); | |
9306 | * lock(&ctx->uring_lock); | |
9307 | * lock(&ep->mtx); | |
9308 | * | |
9309 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9310 | * pushs them to do the flush. | |
9311 | */ | |
5ed7a37d | 9312 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9313 | mask |= EPOLLIN | EPOLLRDNORM; |
9314 | ||
9315 | return mask; | |
9316 | } | |
9317 | ||
0bead8cd | 9318 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9319 | { |
4379bf8b | 9320 | const struct cred *creds; |
071698e1 | 9321 | |
61cf9370 | 9322 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9323 | if (creds) { |
9324 | put_cred(creds); | |
0bead8cd | 9325 | return 0; |
1e6fa521 | 9326 | } |
0bead8cd YD |
9327 | |
9328 | return -EINVAL; | |
9329 | } | |
9330 | ||
d56d938b PB |
9331 | struct io_tctx_exit { |
9332 | struct callback_head task_work; | |
9333 | struct completion completion; | |
baf186c4 | 9334 | struct io_ring_ctx *ctx; |
d56d938b PB |
9335 | }; |
9336 | ||
c072481d | 9337 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
9338 | { |
9339 | struct io_uring_task *tctx = current->io_uring; | |
9340 | struct io_tctx_exit *work; | |
9341 | ||
9342 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9343 | /* | |
9344 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9345 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9346 | */ | |
9347 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9348 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9349 | complete(&work->completion); |
9350 | } | |
9351 | ||
c072481d | 9352 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
9353 | { |
9354 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9355 | ||
9356 | return req->ctx == data; | |
9357 | } | |
9358 | ||
c072481d | 9359 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 9360 | { |
d56d938b | 9361 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9362 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9363 | unsigned long interval = HZ / 20; |
d56d938b PB |
9364 | struct io_tctx_exit exit; |
9365 | struct io_tctx_node *node; | |
9366 | int ret; | |
85faa7b8 | 9367 | |
56952e91 JA |
9368 | /* |
9369 | * If we're doing polled IO and end up having requests being | |
9370 | * submitted async (out-of-line), then completions can come in while | |
9371 | * we're waiting for refs to drop. We need to reap these manually, | |
9372 | * as nobody else will be looking for them. | |
9373 | */ | |
b2edc0a7 | 9374 | do { |
3dd0c97a | 9375 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9376 | if (ctx->sq_data) { |
9377 | struct io_sq_data *sqd = ctx->sq_data; | |
9378 | struct task_struct *tsk; | |
9379 | ||
9380 | io_sq_thread_park(sqd); | |
9381 | tsk = sqd->thread; | |
9382 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9383 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9384 | io_cancel_ctx_cb, ctx, true); | |
9385 | io_sq_thread_unpark(sqd); | |
9386 | } | |
b5bb3a24 | 9387 | |
37f0e767 PB |
9388 | io_req_caches_free(ctx); |
9389 | ||
58d3be2c PB |
9390 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9391 | /* there is little hope left, don't run it too often */ | |
9392 | interval = HZ * 60; | |
9393 | } | |
9394 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9395 | |
7f00651a PB |
9396 | init_completion(&exit.completion); |
9397 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9398 | exit.ctx = ctx; | |
89b5066e PB |
9399 | /* |
9400 | * Some may use context even when all refs and requests have been put, | |
9401 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9402 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9403 | * this lock/unlock section also waits them to finish. |
9404 | */ | |
d56d938b PB |
9405 | mutex_lock(&ctx->uring_lock); |
9406 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9407 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9408 | ||
d56d938b PB |
9409 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9410 | ctx_node); | |
7f00651a PB |
9411 | /* don't spin on a single task if cancellation failed */ |
9412 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9413 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9414 | if (WARN_ON_ONCE(ret)) | |
9415 | continue; | |
d56d938b PB |
9416 | |
9417 | mutex_unlock(&ctx->uring_lock); | |
9418 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9419 | mutex_lock(&ctx->uring_lock); |
9420 | } | |
9421 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9422 | spin_lock(&ctx->completion_lock); |
9423 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9424 | |
85faa7b8 JA |
9425 | io_ring_ctx_free(ctx); |
9426 | } | |
9427 | ||
80c4cbdb | 9428 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
9429 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
9430 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
9431 | { |
9432 | struct io_kiocb *req, *tmp; | |
9433 | int canceled = 0; | |
9434 | ||
79ebeaee JA |
9435 | spin_lock(&ctx->completion_lock); |
9436 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9437 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9438 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9439 | io_kill_timeout(req, -ECANCELED); |
9440 | canceled++; | |
9441 | } | |
9442 | } | |
79ebeaee | 9443 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9444 | if (canceled != 0) |
9445 | io_commit_cqring(ctx); | |
79ebeaee | 9446 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9447 | if (canceled != 0) |
9448 | io_cqring_ev_posted(ctx); | |
9449 | return canceled != 0; | |
9450 | } | |
9451 | ||
c072481d | 9452 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 9453 | { |
61cf9370 MWO |
9454 | unsigned long index; |
9455 | struct creds *creds; | |
9456 | ||
2b188cc1 JA |
9457 | mutex_lock(&ctx->uring_lock); |
9458 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9459 | if (ctx->rings) |
6c2450ae | 9460 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9461 | xa_for_each(&ctx->personalities, index, creds) |
9462 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9463 | mutex_unlock(&ctx->uring_lock); |
9464 | ||
3dd0c97a PB |
9465 | io_kill_timeouts(ctx, NULL, true); |
9466 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9467 | |
15dff286 | 9468 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9469 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9470 | |
85faa7b8 | 9471 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9472 | /* |
9473 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9474 | * if we're exiting a ton of rings at the same time. It just adds | |
9475 | * noise and overhead, there's no discernable change in runtime | |
9476 | * over using system_wq. | |
9477 | */ | |
9478 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9479 | } |
9480 | ||
9481 | static int io_uring_release(struct inode *inode, struct file *file) | |
9482 | { | |
9483 | struct io_ring_ctx *ctx = file->private_data; | |
9484 | ||
9485 | file->private_data = NULL; | |
9486 | io_ring_ctx_wait_and_kill(ctx); | |
9487 | return 0; | |
9488 | } | |
9489 | ||
f6edbabb PB |
9490 | struct io_task_cancel { |
9491 | struct task_struct *task; | |
3dd0c97a | 9492 | bool all; |
f6edbabb | 9493 | }; |
f254ac04 | 9494 | |
f6edbabb | 9495 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9496 | { |
9a472ef7 | 9497 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9498 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
9499 | bool ret; |
9500 | ||
3dd0c97a | 9501 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
9502 | struct io_ring_ctx *ctx = req->ctx; |
9503 | ||
9504 | /* protect against races with linked timeouts */ | |
79ebeaee | 9505 | spin_lock(&ctx->completion_lock); |
3dd0c97a | 9506 | ret = io_match_task(req, cancel->task, cancel->all); |
79ebeaee | 9507 | spin_unlock(&ctx->completion_lock); |
9a472ef7 | 9508 | } else { |
3dd0c97a | 9509 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
9510 | } |
9511 | return ret; | |
b711d4ea JA |
9512 | } |
9513 | ||
c072481d PB |
9514 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
9515 | struct task_struct *task, | |
9516 | bool cancel_all) | |
b7ddce3c | 9517 | { |
e1915f76 | 9518 | struct io_defer_entry *de; |
b7ddce3c PB |
9519 | LIST_HEAD(list); |
9520 | ||
79ebeaee | 9521 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9522 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
3dd0c97a | 9523 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
9524 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9525 | break; | |
9526 | } | |
9527 | } | |
79ebeaee | 9528 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9529 | if (list_empty(&list)) |
9530 | return false; | |
b7ddce3c PB |
9531 | |
9532 | while (!list_empty(&list)) { | |
9533 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9534 | list_del_init(&de->list); | |
f41db273 | 9535 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9536 | kfree(de); |
9537 | } | |
e1915f76 | 9538 | return true; |
b7ddce3c PB |
9539 | } |
9540 | ||
c072481d | 9541 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
9542 | { |
9543 | struct io_tctx_node *node; | |
9544 | enum io_wq_cancel cret; | |
9545 | bool ret = false; | |
9546 | ||
9547 | mutex_lock(&ctx->uring_lock); | |
9548 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9549 | struct io_uring_task *tctx = node->task->io_uring; | |
9550 | ||
9551 | /* | |
9552 | * io_wq will stay alive while we hold uring_lock, because it's | |
9553 | * killed after ctx nodes, which requires to take the lock. | |
9554 | */ | |
9555 | if (!tctx || !tctx->io_wq) | |
9556 | continue; | |
9557 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9558 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9559 | } | |
9560 | mutex_unlock(&ctx->uring_lock); | |
9561 | ||
9562 | return ret; | |
9563 | } | |
9564 | ||
c072481d PB |
9565 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9566 | struct task_struct *task, | |
9567 | bool cancel_all) | |
9936c7c2 | 9568 | { |
3dd0c97a | 9569 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9570 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9571 | |
9572 | while (1) { | |
9573 | enum io_wq_cancel cret; | |
9574 | bool ret = false; | |
9575 | ||
1b00764f PB |
9576 | if (!task) { |
9577 | ret |= io_uring_try_cancel_iowq(ctx); | |
9578 | } else if (tctx && tctx->io_wq) { | |
9579 | /* | |
9580 | * Cancels requests of all rings, not only @ctx, but | |
9581 | * it's fine as the task is in exit/exec. | |
9582 | */ | |
5aa75ed5 | 9583 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9584 | &cancel, true); |
9585 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9586 | } | |
9587 | ||
9588 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9589 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9590 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 9591 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
9592 | io_iopoll_try_reap_events(ctx); |
9593 | ret = true; | |
9594 | } | |
9595 | } | |
9596 | ||
3dd0c97a PB |
9597 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9598 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9599 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9600 | if (task) |
9601 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9602 | if (!ret) |
9603 | break; | |
9604 | cond_resched(); | |
9605 | } | |
9606 | } | |
9607 | ||
eef51daa | 9608 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9609 | { |
236434c3 | 9610 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9611 | struct io_tctx_node *node; |
a528b04e | 9612 | int ret; |
236434c3 MWO |
9613 | |
9614 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9615 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9616 | if (unlikely(ret)) |
9617 | return ret; | |
236434c3 | 9618 | tctx = current->io_uring; |
0f212204 | 9619 | } |
cf27f3b1 PB |
9620 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9621 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9622 | if (!node) | |
9623 | return -ENOMEM; | |
9624 | node->ctx = ctx; | |
9625 | node->task = current; | |
13bf43f5 | 9626 | |
cf27f3b1 PB |
9627 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9628 | node, GFP_KERNEL)); | |
9629 | if (ret) { | |
9630 | kfree(node); | |
9631 | return ret; | |
0f212204 | 9632 | } |
cf27f3b1 PB |
9633 | |
9634 | mutex_lock(&ctx->uring_lock); | |
9635 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9636 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9637 | } |
cf27f3b1 | 9638 | tctx->last = ctx; |
0f212204 JA |
9639 | return 0; |
9640 | } | |
9641 | ||
cf27f3b1 PB |
9642 | /* |
9643 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9644 | */ | |
eef51daa | 9645 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9646 | { |
9647 | struct io_uring_task *tctx = current->io_uring; | |
9648 | ||
9649 | if (likely(tctx && tctx->last == ctx)) | |
9650 | return 0; | |
eef51daa | 9651 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9652 | } |
9653 | ||
0f212204 JA |
9654 | /* |
9655 | * Remove this io_uring_file -> task mapping. | |
9656 | */ | |
c072481d | 9657 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9658 | { |
9659 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9660 | struct io_tctx_node *node; |
2941267b | 9661 | |
eebd2e37 PB |
9662 | if (!tctx) |
9663 | return; | |
13bf43f5 PB |
9664 | node = xa_erase(&tctx->xa, index); |
9665 | if (!node) | |
2941267b | 9666 | return; |
0f212204 | 9667 | |
13bf43f5 PB |
9668 | WARN_ON_ONCE(current != node->task); |
9669 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9670 | ||
9671 | mutex_lock(&node->ctx->uring_lock); | |
9672 | list_del(&node->ctx_node); | |
9673 | mutex_unlock(&node->ctx->uring_lock); | |
9674 | ||
baf186c4 | 9675 | if (tctx->last == node->ctx) |
0f212204 | 9676 | tctx->last = NULL; |
13bf43f5 | 9677 | kfree(node); |
0f212204 JA |
9678 | } |
9679 | ||
c072481d | 9680 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9681 | { |
ba5ef6dc | 9682 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9683 | struct io_tctx_node *node; |
de7f1d9e PB |
9684 | unsigned long index; |
9685 | ||
8bab4c09 | 9686 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 9687 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
9688 | cond_resched(); |
9689 | } | |
b16ef427 ME |
9690 | if (wq) { |
9691 | /* | |
9692 | * Must be after io_uring_del_task_file() (removes nodes under | |
9693 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9694 | */ | |
ba5ef6dc | 9695 | io_wq_put_and_exit(wq); |
dadebc35 | 9696 | tctx->io_wq = NULL; |
b16ef427 | 9697 | } |
de7f1d9e PB |
9698 | } |
9699 | ||
3f48cf18 | 9700 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9701 | { |
3f48cf18 PB |
9702 | if (tracked) |
9703 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9704 | return percpu_counter_sum(&tctx->inflight); |
9705 | } | |
9706 | ||
c072481d | 9707 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
09899b19 PB |
9708 | { |
9709 | struct io_uring_task *tctx = task->io_uring; | |
9710 | unsigned int refs = tctx->cached_refs; | |
9711 | ||
e9dbe221 PB |
9712 | if (refs) { |
9713 | tctx->cached_refs = 0; | |
9714 | percpu_counter_sub(&tctx->inflight, refs); | |
9715 | put_task_struct_many(task, refs); | |
9716 | } | |
09899b19 PB |
9717 | } |
9718 | ||
78cc687b PB |
9719 | /* |
9720 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9721 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9722 | */ | |
c072481d PB |
9723 | static __cold void io_uring_cancel_generic(bool cancel_all, |
9724 | struct io_sq_data *sqd) | |
0e9ddb39 | 9725 | { |
521d6a73 | 9726 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9727 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9728 | s64 inflight; |
9729 | DEFINE_WAIT(wait); | |
fdaf083c | 9730 | |
78cc687b PB |
9731 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9732 | ||
6d042ffb PO |
9733 | if (!current->io_uring) |
9734 | return; | |
17a91051 PB |
9735 | if (tctx->io_wq) |
9736 | io_wq_exit_start(tctx->io_wq); | |
9737 | ||
0e9ddb39 PB |
9738 | atomic_inc(&tctx->in_idle); |
9739 | do { | |
e9dbe221 | 9740 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9741 | /* read completions before cancelations */ |
78cc687b | 9742 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9743 | if (!inflight) |
9744 | break; | |
fdaf083c | 9745 | |
78cc687b PB |
9746 | if (!sqd) { |
9747 | struct io_tctx_node *node; | |
9748 | unsigned long index; | |
0f212204 | 9749 | |
78cc687b PB |
9750 | xa_for_each(&tctx->xa, index, node) { |
9751 | /* sqpoll task will cancel all its requests */ | |
9752 | if (node->ctx->sq_data) | |
9753 | continue; | |
9754 | io_uring_try_cancel_requests(node->ctx, current, | |
9755 | cancel_all); | |
9756 | } | |
9757 | } else { | |
9758 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9759 | io_uring_try_cancel_requests(ctx, current, | |
9760 | cancel_all); | |
9761 | } | |
17a91051 | 9762 | |
0f212204 | 9763 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9764 | io_uring_drop_tctx_refs(current); |
0f212204 | 9765 | /* |
a1bb3cd5 PB |
9766 | * If we've seen completions, retry without waiting. This |
9767 | * avoids a race where a completion comes in before we did | |
9768 | * prepare_to_wait(). | |
0f212204 | 9769 | */ |
3dd0c97a | 9770 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9771 | schedule(); |
f57555ed | 9772 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9773 | } while (1); |
fdaf083c | 9774 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9775 | |
8452d4a6 | 9776 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9777 | if (cancel_all) { |
3f48cf18 PB |
9778 | /* for exec all current's requests should be gone, kill tctx */ |
9779 | __io_uring_free(current); | |
9780 | } | |
44e728b8 PB |
9781 | } |
9782 | ||
f552a27a | 9783 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9784 | { |
f552a27a | 9785 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9786 | } |
9787 | ||
6c5c240e RP |
9788 | static void *io_uring_validate_mmap_request(struct file *file, |
9789 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9790 | { |
2b188cc1 | 9791 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9792 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9793 | struct page *page; |
9794 | void *ptr; | |
9795 | ||
9796 | switch (offset) { | |
9797 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9798 | case IORING_OFF_CQ_RING: |
9799 | ptr = ctx->rings; | |
2b188cc1 JA |
9800 | break; |
9801 | case IORING_OFF_SQES: | |
9802 | ptr = ctx->sq_sqes; | |
9803 | break; | |
2b188cc1 | 9804 | default: |
6c5c240e | 9805 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9806 | } |
9807 | ||
9808 | page = virt_to_head_page(ptr); | |
a50b854e | 9809 | if (sz > page_size(page)) |
6c5c240e RP |
9810 | return ERR_PTR(-EINVAL); |
9811 | ||
9812 | return ptr; | |
9813 | } | |
9814 | ||
9815 | #ifdef CONFIG_MMU | |
9816 | ||
c072481d | 9817 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
9818 | { |
9819 | size_t sz = vma->vm_end - vma->vm_start; | |
9820 | unsigned long pfn; | |
9821 | void *ptr; | |
9822 | ||
9823 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9824 | if (IS_ERR(ptr)) | |
9825 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9826 | |
9827 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9828 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9829 | } | |
9830 | ||
6c5c240e RP |
9831 | #else /* !CONFIG_MMU */ |
9832 | ||
9833 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9834 | { | |
9835 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9836 | } | |
9837 | ||
9838 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9839 | { | |
9840 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9841 | } | |
9842 | ||
9843 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9844 | unsigned long addr, unsigned long len, | |
9845 | unsigned long pgoff, unsigned long flags) | |
9846 | { | |
9847 | void *ptr; | |
9848 | ||
9849 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9850 | if (IS_ERR(ptr)) | |
9851 | return PTR_ERR(ptr); | |
9852 | ||
9853 | return (unsigned long) ptr; | |
9854 | } | |
9855 | ||
9856 | #endif /* !CONFIG_MMU */ | |
9857 | ||
d9d05217 | 9858 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9859 | { |
9860 | DEFINE_WAIT(wait); | |
9861 | ||
9862 | do { | |
9863 | if (!io_sqring_full(ctx)) | |
9864 | break; | |
90554200 JA |
9865 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9866 | ||
9867 | if (!io_sqring_full(ctx)) | |
9868 | break; | |
90554200 JA |
9869 | schedule(); |
9870 | } while (!signal_pending(current)); | |
9871 | ||
9872 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9873 | return 0; |
90554200 JA |
9874 | } |
9875 | ||
c73ebb68 HX |
9876 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9877 | struct __kernel_timespec __user **ts, | |
9878 | const sigset_t __user **sig) | |
9879 | { | |
9880 | struct io_uring_getevents_arg arg; | |
9881 | ||
9882 | /* | |
9883 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9884 | * is just a pointer to the sigset_t. | |
9885 | */ | |
9886 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9887 | *sig = (const sigset_t __user *) argp; | |
9888 | *ts = NULL; | |
9889 | return 0; | |
9890 | } | |
9891 | ||
9892 | /* | |
9893 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9894 | * timespec and sigset_t pointers if good. | |
9895 | */ | |
9896 | if (*argsz != sizeof(arg)) | |
9897 | return -EINVAL; | |
9898 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9899 | return -EFAULT; | |
9900 | *sig = u64_to_user_ptr(arg.sigmask); | |
9901 | *argsz = arg.sigmask_sz; | |
9902 | *ts = u64_to_user_ptr(arg.ts); | |
9903 | return 0; | |
9904 | } | |
9905 | ||
2b188cc1 | 9906 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9907 | u32, min_complete, u32, flags, const void __user *, argp, |
9908 | size_t, argsz) | |
2b188cc1 JA |
9909 | { |
9910 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9911 | int submitted = 0; |
9912 | struct fd f; | |
33f993da | 9913 | long ret; |
2b188cc1 | 9914 | |
4c6e277c | 9915 | io_run_task_work(); |
b41e9852 | 9916 | |
33f993da PB |
9917 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9918 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9919 | return -EINVAL; |
9920 | ||
9921 | f = fdget(fd); | |
33f993da | 9922 | if (unlikely(!f.file)) |
2b188cc1 JA |
9923 | return -EBADF; |
9924 | ||
9925 | ret = -EOPNOTSUPP; | |
33f993da | 9926 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9927 | goto out_fput; |
9928 | ||
9929 | ret = -ENXIO; | |
9930 | ctx = f.file->private_data; | |
33f993da | 9931 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9932 | goto out_fput; |
9933 | ||
7e84e1c7 | 9934 | ret = -EBADFD; |
33f993da | 9935 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9936 | goto out; |
9937 | ||
6c271ce2 JA |
9938 | /* |
9939 | * For SQ polling, the thread will do all submissions and completions. | |
9940 | * Just return the requested submit count, and wake the thread if | |
9941 | * we were asked to. | |
9942 | */ | |
b2a9eada | 9943 | ret = 0; |
6c271ce2 | 9944 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 9945 | io_cqring_overflow_flush(ctx); |
89448c47 | 9946 | |
21f96522 JA |
9947 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9948 | ret = -EOWNERDEAD; | |
04147488 | 9949 | goto out; |
21f96522 | 9950 | } |
6c271ce2 | 9951 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9952 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9953 | if (flags & IORING_ENTER_SQ_WAIT) { |
9954 | ret = io_sqpoll_wait_sq(ctx); | |
9955 | if (ret) | |
9956 | goto out; | |
9957 | } | |
6c271ce2 | 9958 | submitted = to_submit; |
b2a9eada | 9959 | } else if (to_submit) { |
eef51daa | 9960 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9961 | if (unlikely(ret)) |
9962 | goto out; | |
2b188cc1 | 9963 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9964 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9965 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9966 | |
9967 | if (submitted != to_submit) | |
9968 | goto out; | |
2b188cc1 JA |
9969 | } |
9970 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9971 | const sigset_t __user *sig; |
9972 | struct __kernel_timespec __user *ts; | |
9973 | ||
9974 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9975 | if (unlikely(ret)) | |
9976 | goto out; | |
9977 | ||
2b188cc1 JA |
9978 | min_complete = min(min_complete, ctx->cq_entries); |
9979 | ||
32b2244a XW |
9980 | /* |
9981 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9982 | * space applications don't need to do io completion events | |
9983 | * polling again, they can rely on io_sq_thread to do polling | |
9984 | * work, which can reduce cpu usage and uring_lock contention. | |
9985 | */ | |
9986 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9987 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9988 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9989 | } else { |
c73ebb68 | 9990 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9991 | } |
2b188cc1 JA |
9992 | } |
9993 | ||
7c504e65 | 9994 | out: |
6805b32e | 9995 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9996 | out_fput: |
9997 | fdput(f); | |
9998 | return submitted ? submitted : ret; | |
9999 | } | |
10000 | ||
bebdb65e | 10001 | #ifdef CONFIG_PROC_FS |
c072481d | 10002 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 10003 | const struct cred *cred) |
87ce955b | 10004 | { |
87ce955b JA |
10005 | struct user_namespace *uns = seq_user_ns(m); |
10006 | struct group_info *gi; | |
10007 | kernel_cap_t cap; | |
10008 | unsigned __capi; | |
10009 | int g; | |
10010 | ||
10011 | seq_printf(m, "%5d\n", id); | |
10012 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
10013 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
10014 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
10015 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10016 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10017 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10018 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10019 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10020 | seq_puts(m, "\n\tGroups:\t"); | |
10021 | gi = cred->group_info; | |
10022 | for (g = 0; g < gi->ngroups; g++) { | |
10023 | seq_put_decimal_ull(m, g ? " " : "", | |
10024 | from_kgid_munged(uns, gi->gid[g])); | |
10025 | } | |
10026 | seq_puts(m, "\n\tCapEff:\t"); | |
10027 | cap = cred->cap_effective; | |
10028 | CAP_FOR_EACH_U32(__capi) | |
10029 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10030 | seq_putc(m, '\n'); | |
10031 | return 0; | |
10032 | } | |
10033 | ||
c072481d PB |
10034 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
10035 | struct seq_file *m) | |
87ce955b | 10036 | { |
dbbe9c64 | 10037 | struct io_sq_data *sq = NULL; |
83f84356 HX |
10038 | struct io_overflow_cqe *ocqe; |
10039 | struct io_rings *r = ctx->rings; | |
10040 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
10041 | unsigned int cached_sq_head = ctx->cached_sq_head; | |
10042 | unsigned int cached_cq_tail = ctx->cached_cq_tail; | |
10043 | unsigned int sq_head = READ_ONCE(r->sq.head); | |
10044 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
10045 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
10046 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
fad8e0de | 10047 | bool has_lock; |
83f84356 HX |
10048 | unsigned int i; |
10049 | ||
10050 | /* | |
10051 | * we may get imprecise sqe and cqe info if uring is actively running | |
10052 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
10053 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
10054 | * we usually use these info when it is stuck. | |
10055 | */ | |
10056 | seq_printf(m, "SqHead:\t%u\n", sq_head & sq_mask); | |
10057 | seq_printf(m, "SqTail:\t%u\n", sq_tail & sq_mask); | |
10058 | seq_printf(m, "CachedSqHead:\t%u\n", cached_sq_head & sq_mask); | |
10059 | seq_printf(m, "CqHead:\t%u\n", cq_head & cq_mask); | |
10060 | seq_printf(m, "CqTail:\t%u\n", cq_tail & cq_mask); | |
10061 | seq_printf(m, "CachedCqTail:\t%u\n", cached_cq_tail & cq_mask); | |
10062 | seq_printf(m, "SQEs:\t%u\n", sq_tail - cached_sq_head); | |
10063 | for (i = cached_sq_head; i < sq_tail; i++) { | |
10064 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[i & sq_mask]); | |
10065 | ||
10066 | if (likely(sq_idx <= sq_mask)) { | |
10067 | struct io_uring_sqe *sqe = &ctx->sq_sqes[sq_idx]; | |
10068 | ||
10069 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
10070 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, sqe->user_data); | |
10071 | } | |
10072 | } | |
10073 | seq_printf(m, "CQEs:\t%u\n", cached_cq_tail - cq_head); | |
10074 | for (i = cq_head; i < cached_cq_tail; i++) { | |
10075 | struct io_uring_cqe *cqe = &r->cqes[i & cq_mask]; | |
10076 | ||
10077 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
10078 | i & cq_mask, cqe->user_data, cqe->res, cqe->flags); | |
10079 | } | |
87ce955b | 10080 | |
fad8e0de JA |
10081 | /* |
10082 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10083 | * since fdinfo case grabs it in the opposite direction of normal use | |
10084 | * cases. If we fail to get the lock, we just don't iterate any | |
10085 | * structures that could be going away outside the io_uring mutex. | |
10086 | */ | |
10087 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10088 | ||
5f3f26f9 | 10089 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10090 | sq = ctx->sq_data; |
5f3f26f9 JA |
10091 | if (!sq->thread) |
10092 | sq = NULL; | |
10093 | } | |
dbbe9c64 JQ |
10094 | |
10095 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10096 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10097 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10098 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10099 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10100 | |
87ce955b JA |
10101 | if (f) |
10102 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10103 | else | |
10104 | seq_printf(m, "%5u: <none>\n", i); | |
10105 | } | |
10106 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10107 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10108 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10109 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10110 | |
4751f53d | 10111 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10112 | } |
61cf9370 MWO |
10113 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10114 | unsigned long index; | |
10115 | const struct cred *cred; | |
10116 | ||
87ce955b | 10117 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10118 | xa_for_each(&ctx->personalities, index, cred) |
10119 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10120 | } |
83f84356 HX |
10121 | if (has_lock) |
10122 | mutex_unlock(&ctx->uring_lock); | |
10123 | ||
10124 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 10125 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10126 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10127 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10128 | struct io_kiocb *req; | |
10129 | ||
10130 | hlist_for_each_entry(req, list, hash_node) | |
10131 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
10132 | req->task->task_works != NULL); | |
10133 | } | |
83f84356 HX |
10134 | |
10135 | seq_puts(m, "CqOverflowList:\n"); | |
10136 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
10137 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
10138 | ||
10139 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
10140 | cqe->user_data, cqe->res, cqe->flags); | |
10141 | ||
10142 | } | |
10143 | ||
79ebeaee | 10144 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
10145 | } |
10146 | ||
c072481d | 10147 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
10148 | { |
10149 | struct io_ring_ctx *ctx = f->private_data; | |
10150 | ||
10151 | if (percpu_ref_tryget(&ctx->refs)) { | |
10152 | __io_uring_show_fdinfo(ctx, m); | |
10153 | percpu_ref_put(&ctx->refs); | |
10154 | } | |
10155 | } | |
bebdb65e | 10156 | #endif |
87ce955b | 10157 | |
2b188cc1 JA |
10158 | static const struct file_operations io_uring_fops = { |
10159 | .release = io_uring_release, | |
10160 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10161 | #ifndef CONFIG_MMU |
10162 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10163 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10164 | #endif | |
2b188cc1 | 10165 | .poll = io_uring_poll, |
bebdb65e | 10166 | #ifdef CONFIG_PROC_FS |
87ce955b | 10167 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10168 | #endif |
2b188cc1 JA |
10169 | }; |
10170 | ||
c072481d PB |
10171 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
10172 | struct io_uring_params *p) | |
2b188cc1 | 10173 | { |
75b28aff HV |
10174 | struct io_rings *rings; |
10175 | size_t size, sq_array_offset; | |
2b188cc1 | 10176 | |
bd740481 JA |
10177 | /* make sure these are sane, as we already accounted them */ |
10178 | ctx->sq_entries = p->sq_entries; | |
10179 | ctx->cq_entries = p->cq_entries; | |
10180 | ||
75b28aff HV |
10181 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10182 | if (size == SIZE_MAX) | |
10183 | return -EOVERFLOW; | |
10184 | ||
10185 | rings = io_mem_alloc(size); | |
10186 | if (!rings) | |
2b188cc1 JA |
10187 | return -ENOMEM; |
10188 | ||
75b28aff HV |
10189 | ctx->rings = rings; |
10190 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
10191 | rings->sq_ring_mask = p->sq_entries - 1; | |
10192 | rings->cq_ring_mask = p->cq_entries - 1; | |
10193 | rings->sq_ring_entries = p->sq_entries; | |
10194 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
10195 | |
10196 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
10197 | if (size == SIZE_MAX) { |
10198 | io_mem_free(ctx->rings); | |
10199 | ctx->rings = NULL; | |
2b188cc1 | 10200 | return -EOVERFLOW; |
eb065d30 | 10201 | } |
2b188cc1 JA |
10202 | |
10203 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
10204 | if (!ctx->sq_sqes) { |
10205 | io_mem_free(ctx->rings); | |
10206 | ctx->rings = NULL; | |
2b188cc1 | 10207 | return -ENOMEM; |
eb065d30 | 10208 | } |
2b188cc1 | 10209 | |
2b188cc1 JA |
10210 | return 0; |
10211 | } | |
10212 | ||
9faadcc8 PB |
10213 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
10214 | { | |
10215 | int ret, fd; | |
10216 | ||
10217 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
10218 | if (fd < 0) | |
10219 | return fd; | |
10220 | ||
eef51daa | 10221 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
10222 | if (ret) { |
10223 | put_unused_fd(fd); | |
10224 | return ret; | |
10225 | } | |
10226 | fd_install(fd, file); | |
10227 | return fd; | |
10228 | } | |
10229 | ||
2b188cc1 JA |
10230 | /* |
10231 | * Allocate an anonymous fd, this is what constitutes the application | |
10232 | * visible backing of an io_uring instance. The application mmaps this | |
10233 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
10234 | * we have to tie this fd to a socket for file garbage collection purposes. | |
10235 | */ | |
9faadcc8 | 10236 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
10237 | { |
10238 | struct file *file; | |
9faadcc8 | 10239 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
10240 | int ret; |
10241 | ||
2b188cc1 JA |
10242 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
10243 | &ctx->ring_sock); | |
10244 | if (ret) | |
9faadcc8 | 10245 | return ERR_PTR(ret); |
2b188cc1 JA |
10246 | #endif |
10247 | ||
2b188cc1 JA |
10248 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
10249 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 10250 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
10251 | if (IS_ERR(file)) { |
10252 | sock_release(ctx->ring_sock); | |
10253 | ctx->ring_sock = NULL; | |
10254 | } else { | |
10255 | ctx->ring_sock->file = file; | |
0f212204 | 10256 | } |
2b188cc1 | 10257 | #endif |
9faadcc8 | 10258 | return file; |
2b188cc1 JA |
10259 | } |
10260 | ||
c072481d PB |
10261 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
10262 | struct io_uring_params __user *params) | |
2b188cc1 | 10263 | { |
2b188cc1 | 10264 | struct io_ring_ctx *ctx; |
9faadcc8 | 10265 | struct file *file; |
2b188cc1 JA |
10266 | int ret; |
10267 | ||
8110c1a6 | 10268 | if (!entries) |
2b188cc1 | 10269 | return -EINVAL; |
8110c1a6 JA |
10270 | if (entries > IORING_MAX_ENTRIES) { |
10271 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10272 | return -EINVAL; | |
10273 | entries = IORING_MAX_ENTRIES; | |
10274 | } | |
2b188cc1 JA |
10275 | |
10276 | /* | |
10277 | * Use twice as many entries for the CQ ring. It's possible for the | |
10278 | * application to drive a higher depth than the size of the SQ ring, | |
10279 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
10280 | * some flexibility in overcommitting a bit. If the application has |
10281 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
10282 | * of CQ ring entries manually. | |
2b188cc1 JA |
10283 | */ |
10284 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
10285 | if (p->flags & IORING_SETUP_CQSIZE) { |
10286 | /* | |
10287 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
10288 | * to a power-of-two, if it isn't already. We do NOT impose | |
10289 | * any cq vs sq ring sizing. | |
10290 | */ | |
eb2667b3 | 10291 | if (!p->cq_entries) |
33a107f0 | 10292 | return -EINVAL; |
8110c1a6 JA |
10293 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
10294 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10295 | return -EINVAL; | |
10296 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
10297 | } | |
eb2667b3 JQ |
10298 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
10299 | if (p->cq_entries < p->sq_entries) | |
10300 | return -EINVAL; | |
33a107f0 JA |
10301 | } else { |
10302 | p->cq_entries = 2 * p->sq_entries; | |
10303 | } | |
2b188cc1 | 10304 | |
2b188cc1 | 10305 | ctx = io_ring_ctx_alloc(p); |
62e398be | 10306 | if (!ctx) |
2b188cc1 | 10307 | return -ENOMEM; |
2b188cc1 | 10308 | ctx->compat = in_compat_syscall(); |
62e398be JA |
10309 | if (!capable(CAP_IPC_LOCK)) |
10310 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
10311 | |
10312 | /* | |
10313 | * This is just grabbed for accounting purposes. When a process exits, | |
10314 | * the mm is exited and dropped before the files, hence we need to hang | |
10315 | * on to this mm purely for the purposes of being able to unaccount | |
10316 | * memory (locked/pinned vm). It's not used for anything else. | |
10317 | */ | |
6b7898eb | 10318 | mmgrab(current->mm); |
2aede0e4 | 10319 | ctx->mm_account = current->mm; |
6b7898eb | 10320 | |
2b188cc1 JA |
10321 | ret = io_allocate_scq_urings(ctx, p); |
10322 | if (ret) | |
10323 | goto err; | |
10324 | ||
7e84e1c7 | 10325 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
10326 | if (ret) |
10327 | goto err; | |
eae071c9 | 10328 | /* always set a rsrc node */ |
47b228ce PB |
10329 | ret = io_rsrc_node_switch_start(ctx); |
10330 | if (ret) | |
10331 | goto err; | |
eae071c9 | 10332 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 10333 | |
2b188cc1 | 10334 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
10335 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
10336 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
10337 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
10338 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
10339 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
10340 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
10341 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
10342 | |
10343 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
10344 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
10345 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
10346 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
10347 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
10348 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
10349 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 10350 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 10351 | |
7f13657d XW |
10352 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
10353 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 10354 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 10355 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
10356 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
10357 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
10358 | |
10359 | if (copy_to_user(params, p, sizeof(*p))) { | |
10360 | ret = -EFAULT; | |
10361 | goto err; | |
10362 | } | |
d1719f70 | 10363 | |
9faadcc8 PB |
10364 | file = io_uring_get_file(ctx); |
10365 | if (IS_ERR(file)) { | |
10366 | ret = PTR_ERR(file); | |
10367 | goto err; | |
10368 | } | |
10369 | ||
044c1ab3 JA |
10370 | /* |
10371 | * Install ring fd as the very last thing, so we don't risk someone | |
10372 | * having closed it before we finish setup | |
10373 | */ | |
9faadcc8 PB |
10374 | ret = io_uring_install_fd(ctx, file); |
10375 | if (ret < 0) { | |
10376 | /* fput will clean it up */ | |
10377 | fput(file); | |
10378 | return ret; | |
10379 | } | |
044c1ab3 | 10380 | |
c826bd7a | 10381 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10382 | return ret; |
10383 | err: | |
10384 | io_ring_ctx_wait_and_kill(ctx); | |
10385 | return ret; | |
10386 | } | |
10387 | ||
10388 | /* | |
10389 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10390 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10391 | * params structure passed in. | |
10392 | */ | |
10393 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10394 | { | |
10395 | struct io_uring_params p; | |
2b188cc1 JA |
10396 | int i; |
10397 | ||
10398 | if (copy_from_user(&p, params, sizeof(p))) | |
10399 | return -EFAULT; | |
10400 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10401 | if (p.resv[i]) | |
10402 | return -EINVAL; | |
10403 | } | |
10404 | ||
6c271ce2 | 10405 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10406 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10407 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10408 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10409 | return -EINVAL; |
10410 | ||
7f13657d | 10411 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10412 | } |
10413 | ||
10414 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10415 | struct io_uring_params __user *, params) | |
10416 | { | |
10417 | return io_uring_setup(entries, params); | |
10418 | } | |
10419 | ||
c072481d PB |
10420 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
10421 | unsigned nr_args) | |
66f4af93 JA |
10422 | { |
10423 | struct io_uring_probe *p; | |
10424 | size_t size; | |
10425 | int i, ret; | |
10426 | ||
10427 | size = struct_size(p, ops, nr_args); | |
10428 | if (size == SIZE_MAX) | |
10429 | return -EOVERFLOW; | |
10430 | p = kzalloc(size, GFP_KERNEL); | |
10431 | if (!p) | |
10432 | return -ENOMEM; | |
10433 | ||
10434 | ret = -EFAULT; | |
10435 | if (copy_from_user(p, arg, size)) | |
10436 | goto out; | |
10437 | ret = -EINVAL; | |
10438 | if (memchr_inv(p, 0, size)) | |
10439 | goto out; | |
10440 | ||
10441 | p->last_op = IORING_OP_LAST - 1; | |
10442 | if (nr_args > IORING_OP_LAST) | |
10443 | nr_args = IORING_OP_LAST; | |
10444 | ||
10445 | for (i = 0; i < nr_args; i++) { | |
10446 | p->ops[i].op = i; | |
10447 | if (!io_op_defs[i].not_supported) | |
10448 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10449 | } | |
10450 | p->ops_len = i; | |
10451 | ||
10452 | ret = 0; | |
10453 | if (copy_to_user(arg, p, size)) | |
10454 | ret = -EFAULT; | |
10455 | out: | |
10456 | kfree(p); | |
10457 | return ret; | |
10458 | } | |
10459 | ||
071698e1 JA |
10460 | static int io_register_personality(struct io_ring_ctx *ctx) |
10461 | { | |
4379bf8b | 10462 | const struct cred *creds; |
61cf9370 | 10463 | u32 id; |
1e6fa521 | 10464 | int ret; |
071698e1 | 10465 | |
4379bf8b | 10466 | creds = get_current_cred(); |
1e6fa521 | 10467 | |
61cf9370 MWO |
10468 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10469 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10470 | if (ret < 0) { |
10471 | put_cred(creds); | |
10472 | return ret; | |
10473 | } | |
10474 | return id; | |
071698e1 JA |
10475 | } |
10476 | ||
c072481d PB |
10477 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
10478 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
10479 | { |
10480 | struct io_uring_restriction *res; | |
10481 | size_t size; | |
10482 | int i, ret; | |
10483 | ||
7e84e1c7 SG |
10484 | /* Restrictions allowed only if rings started disabled */ |
10485 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10486 | return -EBADFD; | |
10487 | ||
21b55dbc | 10488 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10489 | if (ctx->restrictions.registered) |
21b55dbc SG |
10490 | return -EBUSY; |
10491 | ||
10492 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10493 | return -EINVAL; | |
10494 | ||
10495 | size = array_size(nr_args, sizeof(*res)); | |
10496 | if (size == SIZE_MAX) | |
10497 | return -EOVERFLOW; | |
10498 | ||
10499 | res = memdup_user(arg, size); | |
10500 | if (IS_ERR(res)) | |
10501 | return PTR_ERR(res); | |
10502 | ||
10503 | ret = 0; | |
10504 | ||
10505 | for (i = 0; i < nr_args; i++) { | |
10506 | switch (res[i].opcode) { | |
10507 | case IORING_RESTRICTION_REGISTER_OP: | |
10508 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10509 | ret = -EINVAL; | |
10510 | goto out; | |
10511 | } | |
10512 | ||
10513 | __set_bit(res[i].register_op, | |
10514 | ctx->restrictions.register_op); | |
10515 | break; | |
10516 | case IORING_RESTRICTION_SQE_OP: | |
10517 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10518 | ret = -EINVAL; | |
10519 | goto out; | |
10520 | } | |
10521 | ||
10522 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10523 | break; | |
10524 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10525 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10526 | break; | |
10527 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10528 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10529 | break; | |
10530 | default: | |
10531 | ret = -EINVAL; | |
10532 | goto out; | |
10533 | } | |
10534 | } | |
10535 | ||
10536 | out: | |
10537 | /* Reset all restrictions if an error happened */ | |
10538 | if (ret != 0) | |
10539 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10540 | else | |
7e84e1c7 | 10541 | ctx->restrictions.registered = true; |
21b55dbc SG |
10542 | |
10543 | kfree(res); | |
10544 | return ret; | |
10545 | } | |
10546 | ||
7e84e1c7 SG |
10547 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10548 | { | |
10549 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10550 | return -EBADFD; | |
10551 | ||
10552 | if (ctx->restrictions.registered) | |
10553 | ctx->restricted = 1; | |
10554 | ||
0298ef96 PB |
10555 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10556 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10557 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10558 | return 0; |
10559 | } | |
10560 | ||
fdecb662 | 10561 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10562 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10563 | unsigned nr_args) |
10564 | { | |
10565 | __u32 tmp; | |
10566 | int err; | |
10567 | ||
c3bdad02 PB |
10568 | if (up->resv) |
10569 | return -EINVAL; | |
98f0b3b4 PB |
10570 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10571 | return -EOVERFLOW; | |
10572 | err = io_rsrc_node_switch_start(ctx); | |
10573 | if (err) | |
10574 | return err; | |
10575 | ||
fdecb662 PB |
10576 | switch (type) { |
10577 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10578 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10579 | case IORING_RSRC_BUFFER: |
10580 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10581 | } |
10582 | return -EINVAL; | |
10583 | } | |
10584 | ||
c3bdad02 PB |
10585 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10586 | unsigned nr_args) | |
98f0b3b4 | 10587 | { |
c3bdad02 | 10588 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10589 | |
10590 | if (!nr_args) | |
10591 | return -EINVAL; | |
c3bdad02 PB |
10592 | memset(&up, 0, sizeof(up)); |
10593 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10594 | return -EFAULT; | |
10595 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10596 | } | |
10597 | ||
10598 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10599 | unsigned size, unsigned type) |
c3bdad02 PB |
10600 | { |
10601 | struct io_uring_rsrc_update2 up; | |
10602 | ||
10603 | if (size != sizeof(up)) | |
10604 | return -EINVAL; | |
98f0b3b4 PB |
10605 | if (copy_from_user(&up, arg, sizeof(up))) |
10606 | return -EFAULT; | |
992da01a | 10607 | if (!up.nr || up.resv) |
98f0b3b4 | 10608 | return -EINVAL; |
992da01a | 10609 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10610 | } |
10611 | ||
c072481d | 10612 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10613 | unsigned int size, unsigned int type) |
792e3582 PB |
10614 | { |
10615 | struct io_uring_rsrc_register rr; | |
10616 | ||
10617 | /* keep it extendible */ | |
10618 | if (size != sizeof(rr)) | |
10619 | return -EINVAL; | |
10620 | ||
10621 | memset(&rr, 0, sizeof(rr)); | |
10622 | if (copy_from_user(&rr, arg, size)) | |
10623 | return -EFAULT; | |
992da01a | 10624 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10625 | return -EINVAL; |
10626 | ||
992da01a | 10627 | switch (type) { |
792e3582 PB |
10628 | case IORING_RSRC_FILE: |
10629 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10630 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10631 | case IORING_RSRC_BUFFER: |
10632 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10633 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10634 | } |
10635 | return -EINVAL; | |
10636 | } | |
10637 | ||
c072481d PB |
10638 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
10639 | void __user *arg, unsigned len) | |
fe76421d JA |
10640 | { |
10641 | struct io_uring_task *tctx = current->io_uring; | |
10642 | cpumask_var_t new_mask; | |
10643 | int ret; | |
10644 | ||
10645 | if (!tctx || !tctx->io_wq) | |
10646 | return -EINVAL; | |
10647 | ||
10648 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10649 | return -ENOMEM; | |
10650 | ||
10651 | cpumask_clear(new_mask); | |
10652 | if (len > cpumask_size()) | |
10653 | len = cpumask_size(); | |
10654 | ||
10655 | if (copy_from_user(new_mask, arg, len)) { | |
10656 | free_cpumask_var(new_mask); | |
10657 | return -EFAULT; | |
10658 | } | |
10659 | ||
10660 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10661 | free_cpumask_var(new_mask); | |
10662 | return ret; | |
10663 | } | |
10664 | ||
c072481d | 10665 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
10666 | { |
10667 | struct io_uring_task *tctx = current->io_uring; | |
10668 | ||
10669 | if (!tctx || !tctx->io_wq) | |
10670 | return -EINVAL; | |
10671 | ||
10672 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10673 | } | |
10674 | ||
c072481d PB |
10675 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10676 | void __user *arg) | |
2e480058 | 10677 | { |
fa84693b JA |
10678 | struct io_uring_task *tctx = NULL; |
10679 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
10680 | __u32 new_count[2]; |
10681 | int i, ret; | |
10682 | ||
2e480058 JA |
10683 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
10684 | return -EFAULT; | |
10685 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10686 | if (new_count[i] > INT_MAX) | |
10687 | return -EINVAL; | |
10688 | ||
fa84693b JA |
10689 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
10690 | sqd = ctx->sq_data; | |
10691 | if (sqd) { | |
009ad9f0 JA |
10692 | /* |
10693 | * Observe the correct sqd->lock -> ctx->uring_lock | |
10694 | * ordering. Fine to drop uring_lock here, we hold | |
10695 | * a ref to the ctx. | |
10696 | */ | |
41d3a6bd | 10697 | refcount_inc(&sqd->refs); |
009ad9f0 | 10698 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 10699 | mutex_lock(&sqd->lock); |
009ad9f0 | 10700 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
10701 | if (sqd->thread) |
10702 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
10703 | } |
10704 | } else { | |
10705 | tctx = current->io_uring; | |
10706 | } | |
10707 | ||
10708 | ret = -EINVAL; | |
10709 | if (!tctx || !tctx->io_wq) | |
10710 | goto err; | |
10711 | ||
2e480058 JA |
10712 | ret = io_wq_max_workers(tctx->io_wq, new_count); |
10713 | if (ret) | |
fa84693b JA |
10714 | goto err; |
10715 | ||
41d3a6bd | 10716 | if (sqd) { |
fa84693b | 10717 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10718 | io_put_sq_data(sqd); |
10719 | } | |
2e480058 JA |
10720 | |
10721 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10722 | return -EFAULT; | |
10723 | ||
10724 | return 0; | |
fa84693b | 10725 | err: |
41d3a6bd | 10726 | if (sqd) { |
fa84693b | 10727 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10728 | io_put_sq_data(sqd); |
10729 | } | |
fa84693b | 10730 | return ret; |
2e480058 JA |
10731 | } |
10732 | ||
071698e1 JA |
10733 | static bool io_register_op_must_quiesce(int op) |
10734 | { | |
10735 | switch (op) { | |
bd54b6fe BM |
10736 | case IORING_REGISTER_BUFFERS: |
10737 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10738 | case IORING_REGISTER_FILES: |
071698e1 JA |
10739 | case IORING_UNREGISTER_FILES: |
10740 | case IORING_REGISTER_FILES_UPDATE: | |
10741 | case IORING_REGISTER_PROBE: | |
10742 | case IORING_REGISTER_PERSONALITY: | |
10743 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10744 | case IORING_REGISTER_FILES2: |
10745 | case IORING_REGISTER_FILES_UPDATE2: | |
10746 | case IORING_REGISTER_BUFFERS2: | |
10747 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10748 | case IORING_REGISTER_IOWQ_AFF: |
10749 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10750 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10751 | return false; |
10752 | default: | |
10753 | return true; | |
10754 | } | |
10755 | } | |
10756 | ||
c072481d | 10757 | static __cold int io_ctx_quiesce(struct io_ring_ctx *ctx) |
e73c5c7c PB |
10758 | { |
10759 | long ret; | |
10760 | ||
10761 | percpu_ref_kill(&ctx->refs); | |
10762 | ||
10763 | /* | |
10764 | * Drop uring mutex before waiting for references to exit. If another | |
10765 | * thread is currently inside io_uring_enter() it might need to grab the | |
10766 | * uring_lock to make progress. If we hold it here across the drain | |
10767 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10768 | * no new references will come in after we've killed the percpu ref. | |
10769 | */ | |
10770 | mutex_unlock(&ctx->uring_lock); | |
10771 | do { | |
37f0e767 PB |
10772 | ret = wait_for_completion_interruptible_timeout(&ctx->ref_comp, HZ); |
10773 | if (ret) { | |
10774 | ret = min(0L, ret); | |
e73c5c7c | 10775 | break; |
37f0e767 PB |
10776 | } |
10777 | ||
e73c5c7c | 10778 | ret = io_run_task_work_sig(); |
37f0e767 | 10779 | io_req_caches_free(ctx); |
e73c5c7c PB |
10780 | } while (ret >= 0); |
10781 | mutex_lock(&ctx->uring_lock); | |
10782 | ||
10783 | if (ret) | |
10784 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10785 | return ret; | |
10786 | } | |
10787 | ||
edafccee JA |
10788 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10789 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10790 | __releases(ctx->uring_lock) |
10791 | __acquires(ctx->uring_lock) | |
edafccee JA |
10792 | { |
10793 | int ret; | |
10794 | ||
35fa71a0 JA |
10795 | /* |
10796 | * We're inside the ring mutex, if the ref is already dying, then | |
10797 | * someone else killed the ctx or is already going through | |
10798 | * io_uring_register(). | |
10799 | */ | |
10800 | if (percpu_ref_is_dying(&ctx->refs)) | |
10801 | return -ENXIO; | |
10802 | ||
75c4021a PB |
10803 | if (ctx->restricted) { |
10804 | if (opcode >= IORING_REGISTER_LAST) | |
10805 | return -EINVAL; | |
10806 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10807 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10808 | return -EACCES; | |
10809 | } | |
10810 | ||
071698e1 | 10811 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10812 | ret = io_ctx_quiesce(ctx); |
10813 | if (ret) | |
f70865db | 10814 | return ret; |
05f3fb3c | 10815 | } |
edafccee JA |
10816 | |
10817 | switch (opcode) { | |
10818 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10819 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10820 | break; |
10821 | case IORING_UNREGISTER_BUFFERS: | |
10822 | ret = -EINVAL; | |
10823 | if (arg || nr_args) | |
10824 | break; | |
0a96bbe4 | 10825 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10826 | break; |
6b06314c | 10827 | case IORING_REGISTER_FILES: |
792e3582 | 10828 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10829 | break; |
10830 | case IORING_UNREGISTER_FILES: | |
10831 | ret = -EINVAL; | |
10832 | if (arg || nr_args) | |
10833 | break; | |
10834 | ret = io_sqe_files_unregister(ctx); | |
10835 | break; | |
c3a31e60 | 10836 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10837 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10838 | break; |
9b402849 | 10839 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10840 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10841 | ret = -EINVAL; |
10842 | if (nr_args != 1) | |
10843 | break; | |
10844 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10845 | if (ret) |
10846 | break; | |
10847 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10848 | ctx->eventfd_async = 1; | |
10849 | else | |
10850 | ctx->eventfd_async = 0; | |
9b402849 JA |
10851 | break; |
10852 | case IORING_UNREGISTER_EVENTFD: | |
10853 | ret = -EINVAL; | |
10854 | if (arg || nr_args) | |
10855 | break; | |
10856 | ret = io_eventfd_unregister(ctx); | |
10857 | break; | |
66f4af93 JA |
10858 | case IORING_REGISTER_PROBE: |
10859 | ret = -EINVAL; | |
10860 | if (!arg || nr_args > 256) | |
10861 | break; | |
10862 | ret = io_probe(ctx, arg, nr_args); | |
10863 | break; | |
071698e1 JA |
10864 | case IORING_REGISTER_PERSONALITY: |
10865 | ret = -EINVAL; | |
10866 | if (arg || nr_args) | |
10867 | break; | |
10868 | ret = io_register_personality(ctx); | |
10869 | break; | |
10870 | case IORING_UNREGISTER_PERSONALITY: | |
10871 | ret = -EINVAL; | |
10872 | if (arg) | |
10873 | break; | |
10874 | ret = io_unregister_personality(ctx, nr_args); | |
10875 | break; | |
7e84e1c7 SG |
10876 | case IORING_REGISTER_ENABLE_RINGS: |
10877 | ret = -EINVAL; | |
10878 | if (arg || nr_args) | |
10879 | break; | |
10880 | ret = io_register_enable_rings(ctx); | |
10881 | break; | |
21b55dbc SG |
10882 | case IORING_REGISTER_RESTRICTIONS: |
10883 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10884 | break; | |
992da01a PB |
10885 | case IORING_REGISTER_FILES2: |
10886 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10887 | break; | |
10888 | case IORING_REGISTER_FILES_UPDATE2: | |
10889 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10890 | IORING_RSRC_FILE); | |
10891 | break; | |
10892 | case IORING_REGISTER_BUFFERS2: | |
10893 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10894 | break; |
992da01a PB |
10895 | case IORING_REGISTER_BUFFERS_UPDATE: |
10896 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10897 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10898 | break; |
fe76421d JA |
10899 | case IORING_REGISTER_IOWQ_AFF: |
10900 | ret = -EINVAL; | |
10901 | if (!arg || !nr_args) | |
10902 | break; | |
10903 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10904 | break; | |
10905 | case IORING_UNREGISTER_IOWQ_AFF: | |
10906 | ret = -EINVAL; | |
10907 | if (arg || nr_args) | |
10908 | break; | |
10909 | ret = io_unregister_iowq_aff(ctx); | |
10910 | break; | |
2e480058 JA |
10911 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
10912 | ret = -EINVAL; | |
10913 | if (!arg || nr_args != 2) | |
10914 | break; | |
10915 | ret = io_register_iowq_max_workers(ctx, arg); | |
10916 | break; | |
edafccee JA |
10917 | default: |
10918 | ret = -EINVAL; | |
10919 | break; | |
10920 | } | |
10921 | ||
071698e1 | 10922 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10923 | /* bring the ctx back to life */ |
05f3fb3c | 10924 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10925 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10926 | } |
edafccee JA |
10927 | return ret; |
10928 | } | |
10929 | ||
10930 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10931 | void __user *, arg, unsigned int, nr_args) | |
10932 | { | |
10933 | struct io_ring_ctx *ctx; | |
10934 | long ret = -EBADF; | |
10935 | struct fd f; | |
10936 | ||
10937 | f = fdget(fd); | |
10938 | if (!f.file) | |
10939 | return -EBADF; | |
10940 | ||
10941 | ret = -EOPNOTSUPP; | |
10942 | if (f.file->f_op != &io_uring_fops) | |
10943 | goto out_fput; | |
10944 | ||
10945 | ctx = f.file->private_data; | |
10946 | ||
b6c23dd5 PB |
10947 | io_run_task_work(); |
10948 | ||
edafccee JA |
10949 | mutex_lock(&ctx->uring_lock); |
10950 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10951 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10952 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10953 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10954 | out_fput: |
10955 | fdput(f); | |
10956 | return ret; | |
10957 | } | |
10958 | ||
2b188cc1 JA |
10959 | static int __init io_uring_init(void) |
10960 | { | |
d7f62e82 SM |
10961 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10962 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10963 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10964 | } while (0) | |
10965 | ||
10966 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10967 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10968 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10969 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10970 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10971 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10972 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10973 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10974 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10975 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10976 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10977 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10978 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10979 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10980 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10981 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10982 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10983 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10984 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10985 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10986 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10987 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10988 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10989 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10990 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10991 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10992 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10993 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10994 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10995 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10996 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10997 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 10998 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 10999 | |
b0d658ec PB |
11000 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
11001 | sizeof(struct io_uring_rsrc_update)); | |
11002 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
11003 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
11004 | |
11005 | /* ->buf_index is u16 */ | |
11006 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
11007 | ||
b0d658ec PB |
11008 | /* should fit into one byte */ |
11009 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
11010 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
11011 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 11012 | |
d3656344 | 11013 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 11014 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 11015 | |
91f245d5 JA |
11016 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
11017 | SLAB_ACCOUNT); | |
2b188cc1 JA |
11018 | return 0; |
11019 | }; | |
11020 | __initcall(io_uring_init); |