Commit | Line | Data |
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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> |
5bd2182d | 82 | #include <linux/audit.h> |
cdc1404a | 83 | #include <linux/security.h> |
2b188cc1 | 84 | |
c826bd7a DD |
85 | #define CREATE_TRACE_POINTS |
86 | #include <trace/events/io_uring.h> | |
87 | ||
2b188cc1 JA |
88 | #include <uapi/linux/io_uring.h> |
89 | ||
90 | #include "internal.h" | |
561fb04a | 91 | #include "io-wq.h" |
2b188cc1 | 92 | |
5277deaa | 93 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 94 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 95 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 96 | |
187f08c1 | 97 | /* only define max */ |
042b0d85 | 98 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
99 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
100 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 101 | |
187f08c1 | 102 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
103 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
104 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
105 | ||
489809e2 PB |
106 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
107 | ||
68fe256a | 108 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
5562a8d7 | 109 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) |
68fe256a | 110 | |
5562a8d7 PB |
111 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS | IOSQE_BUFFER_SELECT | \ |
112 | IOSQE_IO_DRAIN | IOSQE_CQE_SKIP_SUCCESS) | |
68fe256a | 113 | |
c854357b | 114 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
d886e185 PB |
115 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \ |
116 | REQ_F_ASYNC_DATA) | |
b16fed66 | 117 | |
09899b19 PB |
118 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
119 | ||
2b188cc1 JA |
120 | struct io_uring { |
121 | u32 head ____cacheline_aligned_in_smp; | |
122 | u32 tail ____cacheline_aligned_in_smp; | |
123 | }; | |
124 | ||
1e84b97b | 125 | /* |
75b28aff HV |
126 | * This data is shared with the application through the mmap at offsets |
127 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
128 | * |
129 | * The offsets to the member fields are published through struct | |
130 | * io_sqring_offsets when calling io_uring_setup. | |
131 | */ | |
75b28aff | 132 | struct io_rings { |
1e84b97b SB |
133 | /* |
134 | * Head and tail offsets into the ring; the offsets need to be | |
135 | * masked to get valid indices. | |
136 | * | |
75b28aff HV |
137 | * The kernel controls head of the sq ring and the tail of the cq ring, |
138 | * and the application controls tail of the sq ring and the head of the | |
139 | * cq ring. | |
1e84b97b | 140 | */ |
75b28aff | 141 | struct io_uring sq, cq; |
1e84b97b | 142 | /* |
75b28aff | 143 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
144 | * ring_entries - 1) |
145 | */ | |
75b28aff HV |
146 | u32 sq_ring_mask, cq_ring_mask; |
147 | /* Ring sizes (constant, power of 2) */ | |
148 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
149 | /* |
150 | * Number of invalid entries dropped by the kernel due to | |
151 | * invalid index stored in array | |
152 | * | |
153 | * Written by the kernel, shouldn't be modified by the | |
154 | * application (i.e. get number of "new events" by comparing to | |
155 | * cached value). | |
156 | * | |
157 | * After a new SQ head value was read by the application this | |
158 | * counter includes all submissions that were dropped reaching | |
159 | * the new SQ head (and possibly more). | |
160 | */ | |
75b28aff | 161 | u32 sq_dropped; |
1e84b97b | 162 | /* |
0d9b5b3a | 163 | * Runtime SQ flags |
1e84b97b SB |
164 | * |
165 | * Written by the kernel, shouldn't be modified by the | |
166 | * application. | |
167 | * | |
168 | * The application needs a full memory barrier before checking | |
169 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
170 | */ | |
75b28aff | 171 | u32 sq_flags; |
0d9b5b3a SG |
172 | /* |
173 | * Runtime CQ flags | |
174 | * | |
175 | * Written by the application, shouldn't be modified by the | |
176 | * kernel. | |
177 | */ | |
fe7e3257 | 178 | u32 cq_flags; |
1e84b97b SB |
179 | /* |
180 | * Number of completion events lost because the queue was full; | |
181 | * this should be avoided by the application by making sure | |
0b4295b5 | 182 | * there are not more requests pending than there is space in |
1e84b97b SB |
183 | * the completion queue. |
184 | * | |
185 | * Written by the kernel, shouldn't be modified by the | |
186 | * application (i.e. get number of "new events" by comparing to | |
187 | * cached value). | |
188 | * | |
189 | * As completion events come in out of order this counter is not | |
190 | * ordered with any other data. | |
191 | */ | |
75b28aff | 192 | u32 cq_overflow; |
1e84b97b SB |
193 | /* |
194 | * Ring buffer of completion events. | |
195 | * | |
196 | * The kernel writes completion events fresh every time they are | |
197 | * produced, so the application is allowed to modify pending | |
198 | * entries. | |
199 | */ | |
75b28aff | 200 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
201 | }; |
202 | ||
45d189c6 | 203 | enum io_uring_cmd_flags { |
51aac424 | 204 | IO_URING_F_COMPLETE_DEFER = 1, |
3b44b371 | 205 | IO_URING_F_UNLOCKED = 2, |
51aac424 PB |
206 | /* int's last bit, sign checks are usually faster than a bit test */ |
207 | IO_URING_F_NONBLOCK = INT_MIN, | |
45d189c6 PB |
208 | }; |
209 | ||
edafccee JA |
210 | struct io_mapped_ubuf { |
211 | u64 ubuf; | |
4751f53d | 212 | u64 ubuf_end; |
edafccee | 213 | unsigned int nr_bvecs; |
de293938 | 214 | unsigned long acct_pages; |
41edf1a5 | 215 | struct bio_vec bvec[]; |
edafccee JA |
216 | }; |
217 | ||
50238531 BM |
218 | struct io_ring_ctx; |
219 | ||
6c2450ae PB |
220 | struct io_overflow_cqe { |
221 | struct io_uring_cqe cqe; | |
222 | struct list_head list; | |
223 | }; | |
224 | ||
a04b0ac0 PB |
225 | struct io_fixed_file { |
226 | /* file * with additional FFS_* flags */ | |
227 | unsigned long file_ptr; | |
228 | }; | |
229 | ||
269bbe5f BM |
230 | struct io_rsrc_put { |
231 | struct list_head list; | |
b60c8dce | 232 | u64 tag; |
50238531 BM |
233 | union { |
234 | void *rsrc; | |
235 | struct file *file; | |
bd54b6fe | 236 | struct io_mapped_ubuf *buf; |
50238531 | 237 | }; |
269bbe5f BM |
238 | }; |
239 | ||
aeca241b | 240 | struct io_file_table { |
042b0d85 | 241 | struct io_fixed_file *files; |
31b51510 JA |
242 | }; |
243 | ||
b895c9a6 | 244 | struct io_rsrc_node { |
05589553 XW |
245 | struct percpu_ref refs; |
246 | struct list_head node; | |
269bbe5f | 247 | struct list_head rsrc_list; |
b895c9a6 | 248 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 249 | struct llist_node llist; |
e297822b | 250 | bool done; |
05589553 XW |
251 | }; |
252 | ||
40ae0ff7 PB |
253 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
254 | ||
b895c9a6 | 255 | struct io_rsrc_data { |
05f3fb3c JA |
256 | struct io_ring_ctx *ctx; |
257 | ||
2d091d62 PB |
258 | u64 **tags; |
259 | unsigned int nr; | |
40ae0ff7 | 260 | rsrc_put_fn *do_put; |
3e942498 | 261 | atomic_t refs; |
05f3fb3c | 262 | struct completion done; |
8bad28d8 | 263 | bool quiesce; |
05f3fb3c JA |
264 | }; |
265 | ||
5a2e745d JA |
266 | struct io_buffer { |
267 | struct list_head list; | |
268 | __u64 addr; | |
d1f82808 | 269 | __u32 len; |
5a2e745d JA |
270 | __u16 bid; |
271 | }; | |
272 | ||
21b55dbc SG |
273 | struct io_restriction { |
274 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
275 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
276 | u8 sqe_flags_allowed; | |
277 | u8 sqe_flags_required; | |
7e84e1c7 | 278 | bool registered; |
21b55dbc SG |
279 | }; |
280 | ||
37d1e2e3 JA |
281 | enum { |
282 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
283 | IO_SQ_THREAD_SHOULD_PARK, | |
284 | }; | |
285 | ||
534ca6d6 JA |
286 | struct io_sq_data { |
287 | refcount_t refs; | |
9e138a48 | 288 | atomic_t park_pending; |
09a6f4ef | 289 | struct mutex lock; |
69fb2131 JA |
290 | |
291 | /* ctx's that are using this sqd */ | |
292 | struct list_head ctx_list; | |
69fb2131 | 293 | |
534ca6d6 JA |
294 | struct task_struct *thread; |
295 | struct wait_queue_head wait; | |
08369246 XW |
296 | |
297 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
298 | int sq_cpu; |
299 | pid_t task_pid; | |
5c2469e0 | 300 | pid_t task_tgid; |
37d1e2e3 JA |
301 | |
302 | unsigned long state; | |
37d1e2e3 | 303 | struct completion exited; |
534ca6d6 JA |
304 | }; |
305 | ||
6dd0be1e | 306 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 307 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 308 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 309 | |
a1ab7b35 PB |
310 | struct io_submit_link { |
311 | struct io_kiocb *head; | |
312 | struct io_kiocb *last; | |
313 | }; | |
314 | ||
258b29a9 | 315 | struct io_submit_state { |
5a158c6b PB |
316 | /* inline/task_work completion list, under ->uring_lock */ |
317 | struct io_wq_work_node free_list; | |
318 | /* batch completion logic */ | |
319 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 320 | struct io_submit_link link; |
258b29a9 | 321 | |
258b29a9 | 322 | bool plug_started; |
4b628aeb | 323 | bool need_plug; |
3d4aeb9f | 324 | bool flush_cqes; |
5ca7a8b3 | 325 | unsigned short submit_nr; |
5a158c6b | 326 | struct blk_plug plug; |
258b29a9 PB |
327 | }; |
328 | ||
2b188cc1 | 329 | struct io_ring_ctx { |
b52ecf8c | 330 | /* const or read-mostly hot data */ |
2b188cc1 JA |
331 | struct { |
332 | struct percpu_ref refs; | |
2b188cc1 | 333 | |
b52ecf8c | 334 | struct io_rings *rings; |
2b188cc1 | 335 | unsigned int flags; |
e1d85334 | 336 | unsigned int compat: 1; |
e1d85334 RD |
337 | unsigned int drain_next: 1; |
338 | unsigned int eventfd_async: 1; | |
21b55dbc | 339 | unsigned int restricted: 1; |
f18ee4cf | 340 | unsigned int off_timeout_used: 1; |
10c66904 | 341 | unsigned int drain_active: 1; |
5562a8d7 | 342 | unsigned int drain_disabled: 1; |
b52ecf8c | 343 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 344 | |
7f1129d2 | 345 | /* submission data */ |
b52ecf8c | 346 | struct { |
0499e582 PB |
347 | struct mutex uring_lock; |
348 | ||
75b28aff HV |
349 | /* |
350 | * Ring buffer of indices into array of io_uring_sqe, which is | |
351 | * mmapped by the application using the IORING_OFF_SQES offset. | |
352 | * | |
353 | * This indirection could e.g. be used to assign fixed | |
354 | * io_uring_sqe entries to operations and only submit them to | |
355 | * the queue when needed. | |
356 | * | |
357 | * The kernel modifies neither the indices array nor the entries | |
358 | * array. | |
359 | */ | |
360 | u32 *sq_array; | |
c7af47cf | 361 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
362 | unsigned cached_sq_head; |
363 | unsigned sq_entries; | |
de0617e4 | 364 | struct list_head defer_list; |
7f1129d2 PB |
365 | |
366 | /* | |
367 | * Fixed resources fast path, should be accessed only under | |
368 | * uring_lock, and updated through io_uring_register(2) | |
369 | */ | |
370 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 371 | int rsrc_cached_refs; |
7f1129d2 PB |
372 | struct io_file_table file_table; |
373 | unsigned nr_user_files; | |
374 | unsigned nr_user_bufs; | |
375 | struct io_mapped_ubuf **user_bufs; | |
376 | ||
377 | struct io_submit_state submit_state; | |
5262f567 | 378 | struct list_head timeout_list; |
ef9dd637 | 379 | struct list_head ltimeout_list; |
1d7bb1d5 | 380 | struct list_head cq_overflow_list; |
7f1129d2 PB |
381 | struct xarray io_buffers; |
382 | struct xarray personalities; | |
383 | u32 pers_next; | |
384 | unsigned sq_thread_idle; | |
2b188cc1 JA |
385 | } ____cacheline_aligned_in_smp; |
386 | ||
d0acdee2 | 387 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 388 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 389 | unsigned int locked_free_nr; |
3c1a2ead | 390 | |
7c30f36a | 391 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
392 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
393 | ||
90554200 | 394 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 395 | struct list_head sqd_list; |
75b28aff | 396 | |
5ed7a37d PB |
397 | unsigned long check_cq_overflow; |
398 | ||
206aefde JA |
399 | struct { |
400 | unsigned cached_cq_tail; | |
401 | unsigned cq_entries; | |
0499e582 | 402 | struct eventfd_ctx *cq_ev_fd; |
0499e582 PB |
403 | struct wait_queue_head cq_wait; |
404 | unsigned cq_extra; | |
405 | atomic_t cq_timeouts; | |
0499e582 | 406 | unsigned cq_last_tm_flush; |
206aefde | 407 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 408 | |
2b188cc1 JA |
409 | struct { |
410 | spinlock_t completion_lock; | |
e94f141b | 411 | |
89850fce JA |
412 | spinlock_t timeout_lock; |
413 | ||
def596e9 | 414 | /* |
540e32a0 | 415 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
416 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
417 | * For SQPOLL, only the single threaded io_sq_thread() will | |
418 | * manipulate the list, hence no extra locking is needed there. | |
419 | */ | |
5eef4e87 | 420 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
421 | struct hlist_head *cancel_hash; |
422 | unsigned cancel_hash_bits; | |
915b3dde | 423 | bool poll_multi_queue; |
2b188cc1 | 424 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 425 | |
21b55dbc | 426 | struct io_restriction restrictions; |
3c1a2ead | 427 | |
b13a8918 PB |
428 | /* slow path rsrc auxilary data, used by update/register */ |
429 | struct { | |
430 | struct io_rsrc_node *rsrc_backup_node; | |
431 | struct io_mapped_ubuf *dummy_ubuf; | |
432 | struct io_rsrc_data *file_data; | |
433 | struct io_rsrc_data *buf_data; | |
434 | ||
435 | struct delayed_work rsrc_put_work; | |
436 | struct llist_head rsrc_put_llist; | |
437 | struct list_head rsrc_ref_list; | |
438 | spinlock_t rsrc_ref_lock; | |
439 | }; | |
440 | ||
3c1a2ead | 441 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
442 | struct { |
443 | #if defined(CONFIG_UNIX) | |
444 | struct socket *ring_sock; | |
445 | #endif | |
446 | /* hashed buffered write serialization */ | |
447 | struct io_wq_hash *hash_map; | |
448 | ||
449 | /* Only used for accounting purposes */ | |
450 | struct user_struct *user; | |
451 | struct mm_struct *mm_account; | |
452 | ||
453 | /* ctx exit and cancelation */ | |
9011bf9a PB |
454 | struct llist_head fallback_llist; |
455 | struct delayed_work fallback_work; | |
b986af7e PB |
456 | struct work_struct exit_work; |
457 | struct list_head tctx_list; | |
458 | struct completion ref_comp; | |
e139a1ec PB |
459 | u32 iowq_limits[2]; |
460 | bool iowq_limits_set; | |
b986af7e | 461 | }; |
2b188cc1 JA |
462 | }; |
463 | ||
53e043b2 SM |
464 | struct io_uring_task { |
465 | /* submission side */ | |
09899b19 | 466 | int cached_refs; |
53e043b2 SM |
467 | struct xarray xa; |
468 | struct wait_queue_head wait; | |
ee53fb2b SM |
469 | const struct io_ring_ctx *last; |
470 | struct io_wq *io_wq; | |
53e043b2 | 471 | struct percpu_counter inflight; |
b303fe2e | 472 | atomic_t inflight_tracked; |
53e043b2 | 473 | atomic_t in_idle; |
53e043b2 SM |
474 | |
475 | spinlock_t task_lock; | |
476 | struct io_wq_work_list task_list; | |
4813c377 | 477 | struct io_wq_work_list prior_task_list; |
53e043b2 | 478 | struct callback_head task_work; |
6294f368 | 479 | bool task_running; |
53e043b2 SM |
480 | }; |
481 | ||
09bb8394 JA |
482 | /* |
483 | * First field must be the file pointer in all the | |
484 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
485 | */ | |
221c5eb2 JA |
486 | struct io_poll_iocb { |
487 | struct file *file; | |
018043be | 488 | struct wait_queue_head *head; |
221c5eb2 | 489 | __poll_t events; |
392edb45 | 490 | struct wait_queue_entry wait; |
221c5eb2 JA |
491 | }; |
492 | ||
9d805892 | 493 | struct io_poll_update { |
018043be | 494 | struct file *file; |
9d805892 PB |
495 | u64 old_user_data; |
496 | u64 new_user_data; | |
497 | __poll_t events; | |
b69de288 JA |
498 | bool update_events; |
499 | bool update_user_data; | |
018043be PB |
500 | }; |
501 | ||
b5dba59e JA |
502 | struct io_close { |
503 | struct file *file; | |
b5dba59e | 504 | int fd; |
7df778be | 505 | u32 file_slot; |
b5dba59e JA |
506 | }; |
507 | ||
ad8a48ac JA |
508 | struct io_timeout_data { |
509 | struct io_kiocb *req; | |
510 | struct hrtimer timer; | |
511 | struct timespec64 ts; | |
512 | enum hrtimer_mode mode; | |
50c1df2b | 513 | u32 flags; |
ad8a48ac JA |
514 | }; |
515 | ||
8ed8d3c3 JA |
516 | struct io_accept { |
517 | struct file *file; | |
518 | struct sockaddr __user *addr; | |
519 | int __user *addr_len; | |
520 | int flags; | |
aaa4db12 | 521 | u32 file_slot; |
09952e3e | 522 | unsigned long nofile; |
8ed8d3c3 JA |
523 | }; |
524 | ||
525 | struct io_sync { | |
526 | struct file *file; | |
527 | loff_t len; | |
528 | loff_t off; | |
529 | int flags; | |
d63d1b5e | 530 | int mode; |
8ed8d3c3 JA |
531 | }; |
532 | ||
fbf23849 JA |
533 | struct io_cancel { |
534 | struct file *file; | |
535 | u64 addr; | |
536 | }; | |
537 | ||
b29472ee JA |
538 | struct io_timeout { |
539 | struct file *file; | |
bfe68a22 PB |
540 | u32 off; |
541 | u32 target_seq; | |
135fcde8 | 542 | struct list_head list; |
90cd7e42 PB |
543 | /* head of the link, used by linked timeouts only */ |
544 | struct io_kiocb *head; | |
89b263f6 JA |
545 | /* for linked completions */ |
546 | struct io_kiocb *prev; | |
b29472ee JA |
547 | }; |
548 | ||
0bdf7a2d PB |
549 | struct io_timeout_rem { |
550 | struct file *file; | |
551 | u64 addr; | |
9c8e11b3 PB |
552 | |
553 | /* timeout update */ | |
554 | struct timespec64 ts; | |
555 | u32 flags; | |
f1042b6c | 556 | bool ltimeout; |
0bdf7a2d PB |
557 | }; |
558 | ||
9adbd45d JA |
559 | struct io_rw { |
560 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
561 | struct kiocb kiocb; | |
562 | u64 addr; | |
563 | u64 len; | |
564 | }; | |
565 | ||
3fbb51c1 JA |
566 | struct io_connect { |
567 | struct file *file; | |
568 | struct sockaddr __user *addr; | |
569 | int addr_len; | |
570 | }; | |
571 | ||
e47293fd JA |
572 | struct io_sr_msg { |
573 | struct file *file; | |
fddaface | 574 | union { |
4af3417a PB |
575 | struct compat_msghdr __user *umsg_compat; |
576 | struct user_msghdr __user *umsg; | |
577 | void __user *buf; | |
fddaface | 578 | }; |
e47293fd | 579 | int msg_flags; |
bcda7baa | 580 | int bgid; |
fddaface | 581 | size_t len; |
e47293fd JA |
582 | }; |
583 | ||
15b71abe JA |
584 | struct io_open { |
585 | struct file *file; | |
586 | int dfd; | |
b9445598 | 587 | u32 file_slot; |
15b71abe | 588 | struct filename *filename; |
c12cedf2 | 589 | struct open_how how; |
4022e7af | 590 | unsigned long nofile; |
15b71abe JA |
591 | }; |
592 | ||
269bbe5f | 593 | struct io_rsrc_update { |
05f3fb3c JA |
594 | struct file *file; |
595 | u64 arg; | |
596 | u32 nr_args; | |
597 | u32 offset; | |
598 | }; | |
599 | ||
4840e418 JA |
600 | struct io_fadvise { |
601 | struct file *file; | |
602 | u64 offset; | |
603 | u32 len; | |
604 | u32 advice; | |
605 | }; | |
606 | ||
c1ca757b JA |
607 | struct io_madvise { |
608 | struct file *file; | |
609 | u64 addr; | |
610 | u32 len; | |
611 | u32 advice; | |
612 | }; | |
613 | ||
3e4827b0 JA |
614 | struct io_epoll { |
615 | struct file *file; | |
616 | int epfd; | |
617 | int op; | |
618 | int fd; | |
619 | struct epoll_event event; | |
e47293fd JA |
620 | }; |
621 | ||
7d67af2c PB |
622 | struct io_splice { |
623 | struct file *file_out; | |
624 | struct file *file_in; | |
625 | loff_t off_out; | |
626 | loff_t off_in; | |
627 | u64 len; | |
628 | unsigned int flags; | |
629 | }; | |
630 | ||
ddf0322d JA |
631 | struct io_provide_buf { |
632 | struct file *file; | |
633 | __u64 addr; | |
38134ada | 634 | __u32 len; |
ddf0322d JA |
635 | __u32 bgid; |
636 | __u16 nbufs; | |
637 | __u16 bid; | |
638 | }; | |
639 | ||
1d9e1288 BM |
640 | struct io_statx { |
641 | struct file *file; | |
642 | int dfd; | |
643 | unsigned int mask; | |
644 | unsigned int flags; | |
e62753e4 | 645 | const char __user *filename; |
1d9e1288 BM |
646 | struct statx __user *buffer; |
647 | }; | |
648 | ||
36f4fa68 JA |
649 | struct io_shutdown { |
650 | struct file *file; | |
651 | int how; | |
652 | }; | |
653 | ||
80a261fd JA |
654 | struct io_rename { |
655 | struct file *file; | |
656 | int old_dfd; | |
657 | int new_dfd; | |
658 | struct filename *oldpath; | |
659 | struct filename *newpath; | |
660 | int flags; | |
661 | }; | |
662 | ||
14a1143b JA |
663 | struct io_unlink { |
664 | struct file *file; | |
665 | int dfd; | |
666 | int flags; | |
667 | struct filename *filename; | |
668 | }; | |
669 | ||
e34a02dc DK |
670 | struct io_mkdir { |
671 | struct file *file; | |
672 | int dfd; | |
673 | umode_t mode; | |
674 | struct filename *filename; | |
675 | }; | |
676 | ||
7a8721f8 DK |
677 | struct io_symlink { |
678 | struct file *file; | |
679 | int new_dfd; | |
680 | struct filename *oldpath; | |
681 | struct filename *newpath; | |
682 | }; | |
683 | ||
cf30da90 DK |
684 | struct io_hardlink { |
685 | struct file *file; | |
686 | int old_dfd; | |
687 | int new_dfd; | |
688 | struct filename *oldpath; | |
689 | struct filename *newpath; | |
690 | int flags; | |
691 | }; | |
692 | ||
f499a021 JA |
693 | struct io_async_connect { |
694 | struct sockaddr_storage address; | |
695 | }; | |
696 | ||
03b1230c JA |
697 | struct io_async_msghdr { |
698 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
699 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
700 | struct iovec *free_iov; | |
03b1230c JA |
701 | struct sockaddr __user *uaddr; |
702 | struct msghdr msg; | |
b537916c | 703 | struct sockaddr_storage addr; |
03b1230c JA |
704 | }; |
705 | ||
538941e2 | 706 | struct io_rw_state { |
ff6165b2 | 707 | struct iov_iter iter; |
cd658695 | 708 | struct iov_iter_state iter_state; |
c88598a9 | 709 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
710 | }; |
711 | ||
712 | struct io_async_rw { | |
713 | struct io_rw_state s; | |
714 | const struct iovec *free_iovec; | |
227c0c96 | 715 | size_t bytes_done; |
bcf5a063 | 716 | struct wait_page_queue wpq; |
f67676d1 JA |
717 | }; |
718 | ||
6b47ee6e PB |
719 | enum { |
720 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
721 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
722 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
723 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
724 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 725 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
04c76b41 | 726 | REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT, |
6b47ee6e | 727 | |
dddca226 | 728 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 729 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
730 | REQ_F_INFLIGHT_BIT, |
731 | REQ_F_CUR_POS_BIT, | |
732 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 733 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 734 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 735 | REQ_F_POLLED_BIT, |
bcda7baa | 736 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 737 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 738 | REQ_F_REISSUE_BIT, |
b8e64b53 | 739 | REQ_F_CREDS_BIT, |
20e60a38 | 740 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 741 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 742 | REQ_F_ASYNC_DATA_BIT, |
04c76b41 | 743 | REQ_F_SKIP_LINK_CQES_BIT, |
7b29f92d | 744 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 745 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 746 | REQ_F_ISREG_BIT, |
84557871 JA |
747 | |
748 | /* not a real bit, just to check we're not overflowing the space */ | |
749 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
750 | }; |
751 | ||
752 | enum { | |
753 | /* ctx owns file */ | |
754 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
755 | /* drain existing IO first */ | |
756 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
757 | /* linked sqes */ | |
758 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
759 | /* doesn't sever on completion < 0 */ | |
760 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
761 | /* IOSQE_ASYNC */ | |
762 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
763 | /* IOSQE_BUFFER_SELECT */ |
764 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
04c76b41 PB |
765 | /* IOSQE_CQE_SKIP_SUCCESS */ |
766 | REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT), | |
6b47ee6e | 767 | |
6b47ee6e | 768 | /* fail rest of links */ |
93d2bcd2 | 769 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 770 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
771 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
772 | /* read/write uses file position */ | |
773 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
774 | /* must not punt to workers */ | |
775 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 776 | /* has or had linked timeout */ |
6b47ee6e | 777 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
778 | /* needs cleanup */ |
779 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
780 | /* already went through poll handler */ |
781 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
782 | /* buffer already selected */ |
783 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
784 | /* completion is deferred through io_comp_state */ |
785 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
786 | /* caller should reissue async */ |
787 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
788 | /* supports async reads/writes */ |
789 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
790 | /* regular file */ |
791 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
792 | /* has creds assigned */ |
793 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
794 | /* skip refcounting if not set */ |
795 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
796 | /* there is a linked timeout that has to be armed */ |
797 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
798 | /* ->async_data allocated */ |
799 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
04c76b41 PB |
800 | /* don't post CQEs while failing linked requests */ |
801 | REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT), | |
d7718a9d JA |
802 | }; |
803 | ||
804 | struct async_poll { | |
805 | struct io_poll_iocb poll; | |
807abcb0 | 806 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
807 | }; |
808 | ||
f237c30a | 809 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 810 | |
7cbf1722 | 811 | struct io_task_work { |
5b0a6acc PB |
812 | union { |
813 | struct io_wq_work_node node; | |
814 | struct llist_node fallback_node; | |
815 | }; | |
816 | io_req_tw_func_t func; | |
7cbf1722 JA |
817 | }; |
818 | ||
992da01a PB |
819 | enum { |
820 | IORING_RSRC_FILE = 0, | |
821 | IORING_RSRC_BUFFER = 1, | |
822 | }; | |
823 | ||
09bb8394 JA |
824 | /* |
825 | * NOTE! Each of the iocb union members has the file pointer | |
826 | * as the first entry in their struct definition. So you can | |
827 | * access the file pointer through any of the sub-structs, | |
828 | * or directly as just 'ki_filp' in this struct. | |
829 | */ | |
2b188cc1 | 830 | struct io_kiocb { |
221c5eb2 | 831 | union { |
09bb8394 | 832 | struct file *file; |
9adbd45d | 833 | struct io_rw rw; |
221c5eb2 | 834 | struct io_poll_iocb poll; |
9d805892 | 835 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
836 | struct io_accept accept; |
837 | struct io_sync sync; | |
fbf23849 | 838 | struct io_cancel cancel; |
b29472ee | 839 | struct io_timeout timeout; |
0bdf7a2d | 840 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 841 | struct io_connect connect; |
e47293fd | 842 | struct io_sr_msg sr_msg; |
15b71abe | 843 | struct io_open open; |
b5dba59e | 844 | struct io_close close; |
269bbe5f | 845 | struct io_rsrc_update rsrc_update; |
4840e418 | 846 | struct io_fadvise fadvise; |
c1ca757b | 847 | struct io_madvise madvise; |
3e4827b0 | 848 | struct io_epoll epoll; |
7d67af2c | 849 | struct io_splice splice; |
ddf0322d | 850 | struct io_provide_buf pbuf; |
1d9e1288 | 851 | struct io_statx statx; |
36f4fa68 | 852 | struct io_shutdown shutdown; |
80a261fd | 853 | struct io_rename rename; |
14a1143b | 854 | struct io_unlink unlink; |
e34a02dc | 855 | struct io_mkdir mkdir; |
7a8721f8 | 856 | struct io_symlink symlink; |
cf30da90 | 857 | struct io_hardlink hardlink; |
221c5eb2 | 858 | }; |
2b188cc1 | 859 | |
d625c6ee | 860 | u8 opcode; |
65a6543d XW |
861 | /* polled IO has completed */ |
862 | u8 iopoll_completed; | |
4f4eeba8 | 863 | u16 buf_index; |
d17e56eb PB |
864 | unsigned int flags; |
865 | ||
866 | u64 user_data; | |
9cf7c104 | 867 | u32 result; |
d17e56eb | 868 | u32 cflags; |
4f4eeba8 | 869 | |
010e8e6b | 870 | struct io_ring_ctx *ctx; |
010e8e6b | 871 | struct task_struct *task; |
d7718a9d | 872 | |
269bbe5f | 873 | struct percpu_ref *fixed_rsrc_refs; |
d886e185 PB |
874 | /* store used ubuf, so we can prevent reloading */ |
875 | struct io_mapped_ubuf *imu; | |
fcb323cc | 876 | |
7e3709d5 | 877 | /* used by request caches, completion batching and iopoll */ |
ef05d9eb | 878 | struct io_wq_work_node comp_list; |
d17e56eb | 879 | atomic_t refs; |
7e3709d5 | 880 | struct io_kiocb *link; |
5b0a6acc | 881 | struct io_task_work io_task_work; |
010e8e6b PB |
882 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
883 | struct hlist_node hash_node; | |
7e3709d5 | 884 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 885 | struct async_poll *apoll; |
d886e185 PB |
886 | /* opcode allocated if it needs to store data for async defer */ |
887 | void *async_data; | |
010e8e6b | 888 | struct io_wq_work work; |
7e3709d5 | 889 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
fe7e3257 | 890 | const struct cred *creds; |
7e3709d5 | 891 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ |
30d51dd4 | 892 | struct io_buffer *kbuf; |
aa43477b | 893 | atomic_t poll_refs; |
2b188cc1 | 894 | }; |
05589553 | 895 | |
13bf43f5 PB |
896 | struct io_tctx_node { |
897 | struct list_head ctx_node; | |
898 | struct task_struct *task; | |
13bf43f5 PB |
899 | struct io_ring_ctx *ctx; |
900 | }; | |
901 | ||
27dc8338 PB |
902 | struct io_defer_entry { |
903 | struct list_head list; | |
904 | struct io_kiocb *req; | |
9cf7c104 | 905 | u32 seq; |
2b188cc1 JA |
906 | }; |
907 | ||
d3656344 | 908 | struct io_op_def { |
d3656344 JA |
909 | /* needs req->file assigned */ |
910 | unsigned needs_file : 1; | |
6d63416d PB |
911 | /* should block plug */ |
912 | unsigned plug : 1; | |
d3656344 JA |
913 | /* hash wq insertion if file is a regular file */ |
914 | unsigned hash_reg_file : 1; | |
915 | /* unbound wq insertion if file is a non-regular file */ | |
916 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
917 | /* set if opcode supports polled "wait" */ |
918 | unsigned pollin : 1; | |
919 | unsigned pollout : 1; | |
bcda7baa JA |
920 | /* op supports buffer selection */ |
921 | unsigned buffer_select : 1; | |
26f0505a PB |
922 | /* do prep async if is going to be punted */ |
923 | unsigned needs_async_setup : 1; | |
6d63416d PB |
924 | /* opcode is not supported by this kernel */ |
925 | unsigned not_supported : 1; | |
5bd2182d PM |
926 | /* skip auditing */ |
927 | unsigned audit_skip : 1; | |
e8c2bc1f JA |
928 | /* size of async data needed, if any */ |
929 | unsigned short async_size; | |
d3656344 JA |
930 | }; |
931 | ||
0918682b | 932 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
933 | [IORING_OP_NOP] = {}, |
934 | [IORING_OP_READV] = { | |
d3656344 JA |
935 | .needs_file = 1, |
936 | .unbound_nonreg_file = 1, | |
8a72758c | 937 | .pollin = 1, |
4d954c25 | 938 | .buffer_select = 1, |
26f0505a | 939 | .needs_async_setup = 1, |
27926b68 | 940 | .plug = 1, |
5bd2182d | 941 | .audit_skip = 1, |
e8c2bc1f | 942 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 943 | }, |
0463b6c5 | 944 | [IORING_OP_WRITEV] = { |
d3656344 JA |
945 | .needs_file = 1, |
946 | .hash_reg_file = 1, | |
947 | .unbound_nonreg_file = 1, | |
8a72758c | 948 | .pollout = 1, |
26f0505a | 949 | .needs_async_setup = 1, |
27926b68 | 950 | .plug = 1, |
5bd2182d | 951 | .audit_skip = 1, |
e8c2bc1f | 952 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 953 | }, |
0463b6c5 | 954 | [IORING_OP_FSYNC] = { |
d3656344 | 955 | .needs_file = 1, |
5bd2182d | 956 | .audit_skip = 1, |
d3656344 | 957 | }, |
0463b6c5 | 958 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
959 | .needs_file = 1, |
960 | .unbound_nonreg_file = 1, | |
8a72758c | 961 | .pollin = 1, |
27926b68 | 962 | .plug = 1, |
5bd2182d | 963 | .audit_skip = 1, |
e8c2bc1f | 964 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 965 | }, |
0463b6c5 | 966 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
967 | .needs_file = 1, |
968 | .hash_reg_file = 1, | |
969 | .unbound_nonreg_file = 1, | |
8a72758c | 970 | .pollout = 1, |
27926b68 | 971 | .plug = 1, |
5bd2182d | 972 | .audit_skip = 1, |
e8c2bc1f | 973 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 974 | }, |
0463b6c5 | 975 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
976 | .needs_file = 1, |
977 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
978 | .audit_skip = 1, |
979 | }, | |
980 | [IORING_OP_POLL_REMOVE] = { | |
981 | .audit_skip = 1, | |
d3656344 | 982 | }, |
0463b6c5 | 983 | [IORING_OP_SYNC_FILE_RANGE] = { |
d3656344 | 984 | .needs_file = 1, |
5bd2182d | 985 | .audit_skip = 1, |
d3656344 | 986 | }, |
0463b6c5 | 987 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
988 | .needs_file = 1, |
989 | .unbound_nonreg_file = 1, | |
8a72758c | 990 | .pollout = 1, |
26f0505a | 991 | .needs_async_setup = 1, |
e8c2bc1f | 992 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 993 | }, |
0463b6c5 | 994 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
995 | .needs_file = 1, |
996 | .unbound_nonreg_file = 1, | |
8a72758c | 997 | .pollin = 1, |
52de1fe1 | 998 | .buffer_select = 1, |
26f0505a | 999 | .needs_async_setup = 1, |
e8c2bc1f | 1000 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1001 | }, |
0463b6c5 | 1002 | [IORING_OP_TIMEOUT] = { |
5bd2182d | 1003 | .audit_skip = 1, |
e8c2bc1f | 1004 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1005 | }, |
9c8e11b3 PB |
1006 | [IORING_OP_TIMEOUT_REMOVE] = { |
1007 | /* used by timeout updates' prep() */ | |
5bd2182d | 1008 | .audit_skip = 1, |
9c8e11b3 | 1009 | }, |
0463b6c5 | 1010 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
1011 | .needs_file = 1, |
1012 | .unbound_nonreg_file = 1, | |
8a72758c | 1013 | .pollin = 1, |
d3656344 | 1014 | }, |
5bd2182d PM |
1015 | [IORING_OP_ASYNC_CANCEL] = { |
1016 | .audit_skip = 1, | |
1017 | }, | |
0463b6c5 | 1018 | [IORING_OP_LINK_TIMEOUT] = { |
5bd2182d | 1019 | .audit_skip = 1, |
e8c2bc1f | 1020 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1021 | }, |
0463b6c5 | 1022 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1023 | .needs_file = 1, |
1024 | .unbound_nonreg_file = 1, | |
8a72758c | 1025 | .pollout = 1, |
26f0505a | 1026 | .needs_async_setup = 1, |
e8c2bc1f | 1027 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1028 | }, |
0463b6c5 | 1029 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1030 | .needs_file = 1, |
d3656344 | 1031 | }, |
44526bed JA |
1032 | [IORING_OP_OPENAT] = {}, |
1033 | [IORING_OP_CLOSE] = {}, | |
5bd2182d PM |
1034 | [IORING_OP_FILES_UPDATE] = { |
1035 | .audit_skip = 1, | |
1036 | }, | |
1037 | [IORING_OP_STATX] = { | |
1038 | .audit_skip = 1, | |
1039 | }, | |
0463b6c5 | 1040 | [IORING_OP_READ] = { |
3a6820f2 JA |
1041 | .needs_file = 1, |
1042 | .unbound_nonreg_file = 1, | |
8a72758c | 1043 | .pollin = 1, |
bcda7baa | 1044 | .buffer_select = 1, |
27926b68 | 1045 | .plug = 1, |
5bd2182d | 1046 | .audit_skip = 1, |
e8c2bc1f | 1047 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1048 | }, |
0463b6c5 | 1049 | [IORING_OP_WRITE] = { |
3a6820f2 | 1050 | .needs_file = 1, |
7b3188e7 | 1051 | .hash_reg_file = 1, |
3a6820f2 | 1052 | .unbound_nonreg_file = 1, |
8a72758c | 1053 | .pollout = 1, |
27926b68 | 1054 | .plug = 1, |
5bd2182d | 1055 | .audit_skip = 1, |
e8c2bc1f | 1056 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1057 | }, |
0463b6c5 | 1058 | [IORING_OP_FADVISE] = { |
4840e418 | 1059 | .needs_file = 1, |
5bd2182d | 1060 | .audit_skip = 1, |
c1ca757b | 1061 | }, |
44526bed | 1062 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1063 | [IORING_OP_SEND] = { |
fddaface JA |
1064 | .needs_file = 1, |
1065 | .unbound_nonreg_file = 1, | |
8a72758c | 1066 | .pollout = 1, |
5bd2182d | 1067 | .audit_skip = 1, |
fddaface | 1068 | }, |
0463b6c5 | 1069 | [IORING_OP_RECV] = { |
fddaface JA |
1070 | .needs_file = 1, |
1071 | .unbound_nonreg_file = 1, | |
8a72758c | 1072 | .pollin = 1, |
bcda7baa | 1073 | .buffer_select = 1, |
5bd2182d | 1074 | .audit_skip = 1, |
fddaface | 1075 | }, |
0463b6c5 | 1076 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1077 | }, |
3e4827b0 JA |
1078 | [IORING_OP_EPOLL_CTL] = { |
1079 | .unbound_nonreg_file = 1, | |
5bd2182d | 1080 | .audit_skip = 1, |
3e4827b0 | 1081 | }, |
7d67af2c PB |
1082 | [IORING_OP_SPLICE] = { |
1083 | .needs_file = 1, | |
1084 | .hash_reg_file = 1, | |
1085 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1086 | .audit_skip = 1, |
1087 | }, | |
1088 | [IORING_OP_PROVIDE_BUFFERS] = { | |
1089 | .audit_skip = 1, | |
1090 | }, | |
1091 | [IORING_OP_REMOVE_BUFFERS] = { | |
1092 | .audit_skip = 1, | |
ddf0322d | 1093 | }, |
f2a8d5c7 PB |
1094 | [IORING_OP_TEE] = { |
1095 | .needs_file = 1, | |
1096 | .hash_reg_file = 1, | |
1097 | .unbound_nonreg_file = 1, | |
5bd2182d | 1098 | .audit_skip = 1, |
f2a8d5c7 | 1099 | }, |
36f4fa68 JA |
1100 | [IORING_OP_SHUTDOWN] = { |
1101 | .needs_file = 1, | |
1102 | }, | |
44526bed JA |
1103 | [IORING_OP_RENAMEAT] = {}, |
1104 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1105 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1106 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1107 | [IORING_OP_LINKAT] = {}, |
d3656344 JA |
1108 | }; |
1109 | ||
0756a869 PB |
1110 | /* requests with any of those set should undergo io_disarm_next() */ |
1111 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1112 | ||
7a612350 | 1113 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1114 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1115 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1116 | struct task_struct *task, | |
3dd0c97a | 1117 | bool cancel_all); |
78cc687b | 1118 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1119 | |
913a571a PB |
1120 | static void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags); |
1121 | ||
ec9c02ad | 1122 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1123 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1124 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1125 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1126 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1127 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1128 | unsigned nr_args); |
68fb8979 | 1129 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1130 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1131 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1132 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1133 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1134 | |
907d1df3 | 1135 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1136 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1137 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1138 | |
b9445598 PB |
1139 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1140 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1141 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1142 | ||
f1042b6c | 1143 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1144 | |
2b188cc1 JA |
1145 | static struct kmem_cache *req_cachep; |
1146 | ||
0918682b | 1147 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1148 | |
1149 | struct sock *io_uring_get_socket(struct file *file) | |
1150 | { | |
1151 | #if defined(CONFIG_UNIX) | |
1152 | if (file->f_op == &io_uring_fops) { | |
1153 | struct io_ring_ctx *ctx = file->private_data; | |
1154 | ||
1155 | return ctx->ring_sock->sk; | |
1156 | } | |
1157 | #endif | |
1158 | return NULL; | |
1159 | } | |
1160 | EXPORT_SYMBOL(io_uring_get_socket); | |
1161 | ||
f237c30a PB |
1162 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1163 | { | |
1164 | if (!*locked) { | |
1165 | mutex_lock(&ctx->uring_lock); | |
1166 | *locked = true; | |
1167 | } | |
1168 | } | |
1169 | ||
f2f87370 PB |
1170 | #define io_for_each_link(pos, head) \ |
1171 | for (pos = (head); pos; pos = pos->link) | |
1172 | ||
21c843d5 PB |
1173 | /* |
1174 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1175 | * see commit f958d7b528b1 for details. | |
1176 | */ | |
1177 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1178 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1179 | ||
1180 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1181 | { | |
20e60a38 | 1182 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1183 | return atomic_inc_not_zero(&req->refs); |
1184 | } | |
1185 | ||
21c843d5 PB |
1186 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1187 | { | |
20e60a38 PB |
1188 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1189 | return true; | |
1190 | ||
21c843d5 PB |
1191 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1192 | return atomic_dec_and_test(&req->refs); | |
1193 | } | |
1194 | ||
1195 | static inline void req_ref_put(struct io_kiocb *req) | |
1196 | { | |
20e60a38 | 1197 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1198 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1199 | } | |
1200 | ||
1201 | static inline void req_ref_get(struct io_kiocb *req) | |
1202 | { | |
20e60a38 | 1203 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1204 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1205 | atomic_inc(&req->refs); | |
1206 | } | |
1207 | ||
c450178d PB |
1208 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1209 | { | |
6f33b0bc | 1210 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1211 | __io_submit_flush_completions(ctx); |
1212 | } | |
1213 | ||
48dcd38d | 1214 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1215 | { |
1216 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1217 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1218 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1219 | } |
1220 | } | |
1221 | ||
48dcd38d PB |
1222 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1223 | { | |
1224 | __io_req_set_refcount(req, 1); | |
1225 | } | |
1226 | ||
ab409402 PB |
1227 | #define IO_RSRC_REF_BATCH 100 |
1228 | ||
1229 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, | |
1230 | struct io_ring_ctx *ctx) | |
1231 | __must_hold(&ctx->uring_lock) | |
36f72fe2 | 1232 | { |
ab409402 PB |
1233 | struct percpu_ref *ref = req->fixed_rsrc_refs; |
1234 | ||
1235 | if (ref) { | |
1236 | if (ref == &ctx->rsrc_node->refs) | |
1237 | ctx->rsrc_cached_refs++; | |
1238 | else | |
1239 | percpu_ref_put(ref); | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | static inline void io_req_put_rsrc(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1244 | { | |
1245 | if (req->fixed_rsrc_refs) | |
1246 | percpu_ref_put(req->fixed_rsrc_refs); | |
1247 | } | |
1248 | ||
1249 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1250 | __must_hold(&ctx->uring_lock) | |
1251 | { | |
1252 | if (ctx->rsrc_cached_refs) { | |
1253 | percpu_ref_put_many(&ctx->rsrc_node->refs, ctx->rsrc_cached_refs); | |
1254 | ctx->rsrc_cached_refs = 0; | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1259 | __must_hold(&ctx->uring_lock) | |
1260 | { | |
1261 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1262 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1263 | } | |
36f72fe2 | 1264 | |
a46be971 PB |
1265 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
1266 | struct io_ring_ctx *ctx) | |
36f72fe2 | 1267 | { |
269bbe5f | 1268 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1269 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
ab409402 PB |
1270 | ctx->rsrc_cached_refs--; |
1271 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1272 | io_rsrc_refs_refill(ctx); | |
36f72fe2 PB |
1273 | } |
1274 | } | |
1275 | ||
d1fd1c20 | 1276 | static unsigned int __io_put_kbuf(struct io_kiocb *req) |
3648e526 | 1277 | { |
d1fd1c20 | 1278 | struct io_buffer *kbuf = req->kbuf; |
3648e526 HX |
1279 | unsigned int cflags; |
1280 | ||
1281 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
1282 | cflags |= IORING_CQE_F_BUFFER; | |
1283 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
1284 | kfree(kbuf); | |
d1fd1c20 | 1285 | req->kbuf = NULL; |
3648e526 HX |
1286 | return cflags; |
1287 | } | |
1288 | ||
d1fd1c20 | 1289 | static inline unsigned int io_put_kbuf(struct io_kiocb *req) |
3648e526 HX |
1290 | { |
1291 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1292 | return 0; | |
d1fd1c20 | 1293 | return __io_put_kbuf(req); |
3648e526 HX |
1294 | } |
1295 | ||
f70865db PB |
1296 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1297 | { | |
1298 | bool got = percpu_ref_tryget(ref); | |
1299 | ||
1300 | /* already at zero, wait for ->release() */ | |
1301 | if (!got) | |
1302 | wait_for_completion(compl); | |
1303 | percpu_ref_resurrect(ref); | |
1304 | if (got) | |
1305 | percpu_ref_put(ref); | |
1306 | } | |
1307 | ||
3dd0c97a PB |
1308 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1309 | bool cancel_all) | |
08d23634 PB |
1310 | { |
1311 | struct io_kiocb *req; | |
1312 | ||
68207680 | 1313 | if (task && head->task != task) |
08d23634 | 1314 | return false; |
3dd0c97a | 1315 | if (cancel_all) |
08d23634 PB |
1316 | return true; |
1317 | ||
1318 | io_for_each_link(req, head) { | |
b05a1bcd | 1319 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1320 | return true; |
08d23634 PB |
1321 | } |
1322 | return false; | |
1323 | } | |
1324 | ||
d886e185 PB |
1325 | static inline bool req_has_async_data(struct io_kiocb *req) |
1326 | { | |
1327 | return req->flags & REQ_F_ASYNC_DATA; | |
1328 | } | |
1329 | ||
93d2bcd2 | 1330 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1331 | { |
93d2bcd2 | 1332 | req->flags |= REQ_F_FAIL; |
04c76b41 PB |
1333 | if (req->flags & REQ_F_CQE_SKIP) { |
1334 | req->flags &= ~REQ_F_CQE_SKIP; | |
1335 | req->flags |= REQ_F_SKIP_LINK_CQES; | |
1336 | } | |
c40f6379 | 1337 | } |
4a38aed2 | 1338 | |
a8295b98 HX |
1339 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1340 | { | |
1341 | req_set_fail(req); | |
1342 | req->result = res; | |
1343 | } | |
1344 | ||
c072481d | 1345 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1346 | { |
1347 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1348 | ||
0f158b4c | 1349 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1350 | } |
1351 | ||
8eb7e2d0 PB |
1352 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1353 | { | |
1354 | return !req->timeout.off; | |
1355 | } | |
1356 | ||
c072481d | 1357 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1358 | { |
1359 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1360 | fallback_work.work); | |
1361 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1362 | struct io_kiocb *req, *tmp; | |
f237c30a | 1363 | bool locked = false; |
f56165e6 PB |
1364 | |
1365 | percpu_ref_get(&ctx->refs); | |
1366 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1367 | req->io_task_work.func(req, &locked); |
5636c00d | 1368 | |
f237c30a | 1369 | if (locked) { |
c450178d | 1370 | io_submit_flush_completions(ctx); |
f237c30a PB |
1371 | mutex_unlock(&ctx->uring_lock); |
1372 | } | |
f56165e6 PB |
1373 | percpu_ref_put(&ctx->refs); |
1374 | } | |
1375 | ||
c072481d | 1376 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1377 | { |
1378 | struct io_ring_ctx *ctx; | |
78076bb6 | 1379 | int hash_bits; |
2b188cc1 JA |
1380 | |
1381 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1382 | if (!ctx) | |
1383 | return NULL; | |
1384 | ||
78076bb6 JA |
1385 | /* |
1386 | * Use 5 bits less than the max cq entries, that should give us around | |
1387 | * 32 entries per hash list if totally full and uniformly spread. | |
1388 | */ | |
1389 | hash_bits = ilog2(p->cq_entries); | |
1390 | hash_bits -= 5; | |
1391 | if (hash_bits <= 0) | |
1392 | hash_bits = 1; | |
1393 | ctx->cancel_hash_bits = hash_bits; | |
1394 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1395 | GFP_KERNEL); | |
1396 | if (!ctx->cancel_hash) | |
1397 | goto err; | |
1398 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1399 | ||
6224843d PB |
1400 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1401 | if (!ctx->dummy_ubuf) | |
1402 | goto err; | |
1403 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1404 | ctx->dummy_ubuf->ubuf = -1UL; | |
1405 | ||
21482896 | 1406 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1407 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1408 | goto err; | |
2b188cc1 JA |
1409 | |
1410 | ctx->flags = p->flags; | |
90554200 | 1411 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1412 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1413 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1414 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1415 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1416 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1417 | mutex_init(&ctx->uring_lock); |
311997b3 | 1418 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1419 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1420 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1421 | INIT_WQ_LIST(&ctx->iopoll_list); |
de0617e4 | 1422 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1423 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1424 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1425 | spin_lock_init(&ctx->rsrc_ref_lock); |
1426 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1427 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1428 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1429 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1430 | ctx->submit_state.free_list.next = NULL; |
1431 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1432 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1433 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1434 | return ctx; |
206aefde | 1435 | err: |
6224843d | 1436 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1437 | kfree(ctx->cancel_hash); |
206aefde JA |
1438 | kfree(ctx); |
1439 | return NULL; | |
2b188cc1 JA |
1440 | } |
1441 | ||
8f6ed49a PB |
1442 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1443 | { | |
1444 | struct io_rings *r = ctx->rings; | |
1445 | ||
1446 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1447 | ctx->cq_extra--; | |
1448 | } | |
1449 | ||
9cf7c104 | 1450 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1451 | { |
2bc9930e JA |
1452 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1453 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1454 | |
8f6ed49a | 1455 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1456 | } |
de0617e4 | 1457 | |
9d858b21 | 1458 | return false; |
de0617e4 JA |
1459 | } |
1460 | ||
35645ac3 PB |
1461 | #define FFS_NOWAIT 0x1UL |
1462 | #define FFS_ISREG 0x2UL | |
1463 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG) | |
c97d8a0f PB |
1464 | |
1465 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1466 | { | |
35645ac3 | 1467 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1468 | } |
1469 | ||
c072481d | 1470 | static inline void io_req_track_inflight(struct io_kiocb *req) |
ce3d5aae | 1471 | { |
ce3d5aae | 1472 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1473 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1474 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1475 | } |
1476 | } | |
1477 | ||
fd08e530 PB |
1478 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1479 | { | |
906c6caa PB |
1480 | if (WARN_ON_ONCE(!req->link)) |
1481 | return NULL; | |
1482 | ||
4d13d1a4 PB |
1483 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1484 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1485 | |
1486 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1487 | io_req_set_refcount(req); |
4d13d1a4 PB |
1488 | __io_req_set_refcount(req->link, 2); |
1489 | return req->link; | |
fd08e530 PB |
1490 | } |
1491 | ||
1492 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1493 | { | |
4d13d1a4 | 1494 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1495 | return NULL; |
1496 | return __io_prep_linked_timeout(req); | |
1497 | } | |
1498 | ||
1e6fa521 JA |
1499 | static void io_prep_async_work(struct io_kiocb *req) |
1500 | { | |
1501 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1502 | struct io_ring_ctx *ctx = req->ctx; |
1503 | ||
b8e64b53 PB |
1504 | if (!(req->flags & REQ_F_CREDS)) { |
1505 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1506 | req->creds = get_current_cred(); |
b8e64b53 | 1507 | } |
003e8dcc | 1508 | |
e1d675df PB |
1509 | req->work.list.next = NULL; |
1510 | req->work.flags = 0; | |
feaadc4f PB |
1511 | if (req->flags & REQ_F_FORCE_ASYNC) |
1512 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1513 | ||
1e6fa521 JA |
1514 | if (req->flags & REQ_F_ISREG) { |
1515 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1516 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1517 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1518 | if (def->unbound_nonreg_file) |
1519 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1520 | } | |
e1d675df PB |
1521 | |
1522 | switch (req->opcode) { | |
1523 | case IORING_OP_SPLICE: | |
1524 | case IORING_OP_TEE: | |
e1d675df PB |
1525 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1526 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1527 | break; | |
1528 | } | |
561fb04a | 1529 | } |
cccf0ee8 | 1530 | |
cbdcb435 | 1531 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1532 | { |
cbdcb435 | 1533 | struct io_kiocb *cur; |
54a91f3b | 1534 | |
44eff40a PB |
1535 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1536 | struct io_ring_ctx *ctx = req->ctx; | |
1537 | ||
79ebeaee | 1538 | spin_lock(&ctx->completion_lock); |
44eff40a PB |
1539 | io_for_each_link(cur, req) |
1540 | io_prep_async_work(cur); | |
79ebeaee | 1541 | spin_unlock(&ctx->completion_lock); |
44eff40a PB |
1542 | } else { |
1543 | io_for_each_link(cur, req) | |
1544 | io_prep_async_work(cur); | |
1545 | } | |
561fb04a JA |
1546 | } |
1547 | ||
fff4e40e PB |
1548 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1549 | { | |
3d4aeb9f | 1550 | struct io_ring_ctx *ctx = req->ctx; |
33ce2aff | 1551 | struct io_submit_state *state = &ctx->submit_state; |
fff4e40e | 1552 | |
3d4aeb9f PB |
1553 | if (!(req->flags & REQ_F_CQE_SKIP)) |
1554 | ctx->submit_state.flush_cqes = true; | |
fff4e40e PB |
1555 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); |
1556 | } | |
1557 | ||
00169246 | 1558 | static void io_queue_async_work(struct io_kiocb *req, bool *dont_use) |
561fb04a | 1559 | { |
a197f664 | 1560 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1561 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1562 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1563 | |
3bfe6106 JA |
1564 | BUG_ON(!tctx); |
1565 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1566 | |
cbdcb435 PB |
1567 | /* init ->work of the whole link before punting */ |
1568 | io_prep_async_link(req); | |
991468dc JA |
1569 | |
1570 | /* | |
1571 | * Not expected to happen, but if we do have a bug where this _can_ | |
1572 | * happen, catch it here and ensure the request is marked as | |
1573 | * canceled. That will make io-wq go through the usual work cancel | |
1574 | * procedure rather than attempt to run this request (or create a new | |
1575 | * worker for it). | |
1576 | */ | |
1577 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1578 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1579 | ||
d07f1e8a PB |
1580 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1581 | &req->work, req->flags); | |
ebf93667 | 1582 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1583 | if (link) |
1584 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1585 | } |
1586 | ||
1ee4160c | 1587 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1588 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1589 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1590 | { |
e8c2bc1f | 1591 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1592 | |
fd9c7bc5 | 1593 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1594 | if (status) |
1595 | req_set_fail(req); | |
01cec8c1 PB |
1596 | atomic_set(&req->ctx->cq_timeouts, |
1597 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1598 | list_del_init(&req->timeout.list); |
913a571a | 1599 | io_fill_cqe_req(req, status, 0); |
91c2f697 | 1600 | io_put_req_deferred(req); |
5262f567 JA |
1601 | } |
1602 | } | |
1603 | ||
c072481d | 1604 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1605 | { |
441b8a78 | 1606 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1607 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1608 | struct io_defer_entry, list); | |
de0617e4 | 1609 | |
9cf7c104 | 1610 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1611 | break; |
27dc8338 | 1612 | list_del_init(&de->list); |
907d1df3 | 1613 | io_req_task_queue(de->req); |
27dc8338 | 1614 | kfree(de); |
441b8a78 | 1615 | } |
04518945 PB |
1616 | } |
1617 | ||
c072481d | 1618 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1619 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1620 | { |
441b8a78 | 1621 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1622 | |
79ebeaee | 1623 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1624 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1625 | u32 events_needed, events_got; |
360428f8 | 1626 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1627 | struct io_kiocb, timeout.list); |
de0617e4 | 1628 | |
8eb7e2d0 | 1629 | if (io_is_timeout_noseq(req)) |
360428f8 | 1630 | break; |
f010505b MDG |
1631 | |
1632 | /* | |
1633 | * Since seq can easily wrap around over time, subtract | |
1634 | * the last seq at which timeouts were flushed before comparing. | |
1635 | * Assuming not more than 2^31-1 events have happened since, | |
1636 | * these subtractions won't have wrapped, so we can check if | |
1637 | * target is in [last_seq, current_seq] by comparing the two. | |
1638 | */ | |
1639 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1640 | events_got = seq - ctx->cq_last_tm_flush; | |
1641 | if (events_got < events_needed) | |
360428f8 | 1642 | break; |
bfe68a22 | 1643 | |
135fcde8 | 1644 | list_del_init(&req->timeout.list); |
1ee4160c | 1645 | io_kill_timeout(req, 0); |
f18ee4cf | 1646 | } |
f010505b | 1647 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1648 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1649 | } |
5262f567 | 1650 | |
c072481d | 1651 | static __cold void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1652 | { |
2335f6f5 PB |
1653 | if (ctx->off_timeout_used) |
1654 | io_flush_timeouts(ctx); | |
1655 | if (ctx->drain_active) | |
1656 | io_queue_deferred(ctx); | |
1657 | } | |
1658 | ||
1659 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1660 | { | |
1661 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1662 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1663 | /* order cqe stores with ring update */ |
1664 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1665 | } |
1666 | ||
90554200 JA |
1667 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1668 | { | |
1669 | struct io_rings *r = ctx->rings; | |
1670 | ||
a566c556 | 1671 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1672 | } |
1673 | ||
888aae2e PB |
1674 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1675 | { | |
1676 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1677 | } | |
1678 | ||
d068b506 | 1679 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1680 | { |
75b28aff | 1681 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1682 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1683 | |
115e12e5 SB |
1684 | /* |
1685 | * writes to the cq entry need to come after reading head; the | |
1686 | * control dependency is enough as we're using WRITE_ONCE to | |
1687 | * fill the cq entry | |
1688 | */ | |
a566c556 | 1689 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1690 | return NULL; |
1691 | ||
888aae2e | 1692 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1693 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1694 | } |
1695 | ||
f2842ab5 JA |
1696 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1697 | { | |
44c769de | 1698 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1699 | return false; |
7e55a19c SG |
1700 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1701 | return false; | |
44c769de | 1702 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1703 | } |
1704 | ||
2c5d763c JA |
1705 | /* |
1706 | * This should only get called when at least one event has been posted. | |
1707 | * Some applications rely on the eventfd notification count only changing | |
1708 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1709 | * 1:1 relationship between how many times this function is called (and | |
1710 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1711 | */ | |
b41e9852 | 1712 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1713 | { |
5fd46178 JA |
1714 | /* |
1715 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1716 | * io_should_wake() handle the termination of the loop and only | |
1717 | * wake as many waiters as we need to. | |
1718 | */ | |
1719 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1720 | wake_up_all(&ctx->cq_wait); | |
b41e9852 | 1721 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1722 | eventfd_signal(ctx->cq_ev_fd, 1); |
1723 | } | |
1724 | ||
80c18e4a PB |
1725 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1726 | { | |
c57a91fb PB |
1727 | /* see waitqueue_active() comment */ |
1728 | smp_mb(); | |
1729 | ||
80c18e4a | 1730 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c57a91fb | 1731 | if (waitqueue_active(&ctx->cq_wait)) |
5fd46178 | 1732 | wake_up_all(&ctx->cq_wait); |
80c18e4a PB |
1733 | } |
1734 | if (io_should_trigger_evfd(ctx)) | |
1735 | eventfd_signal(ctx->cq_ev_fd, 1); | |
1736 | } | |
1737 | ||
c4a2ed72 | 1738 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1739 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1740 | { |
b18032bb | 1741 | bool all_flushed, posted; |
1d7bb1d5 | 1742 | |
a566c556 | 1743 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1744 | return false; |
1d7bb1d5 | 1745 | |
b18032bb | 1746 | posted = false; |
79ebeaee | 1747 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1748 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1749 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1750 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1751 | |
1d7bb1d5 JA |
1752 | if (!cqe && !force) |
1753 | break; | |
6c2450ae PB |
1754 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1755 | struct io_overflow_cqe, list); | |
1756 | if (cqe) | |
1757 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1758 | else | |
8f6ed49a PB |
1759 | io_account_cq_overflow(ctx); |
1760 | ||
b18032bb | 1761 | posted = true; |
6c2450ae PB |
1762 | list_del(&ocqe->list); |
1763 | kfree(ocqe); | |
1d7bb1d5 JA |
1764 | } |
1765 | ||
09e88404 PB |
1766 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1767 | if (all_flushed) { | |
5ed7a37d | 1768 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1769 | WRITE_ONCE(ctx->rings->sq_flags, |
1770 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1771 | } |
46930143 | 1772 | |
b18032bb JA |
1773 | if (posted) |
1774 | io_commit_cqring(ctx); | |
79ebeaee | 1775 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1776 | if (posted) |
1777 | io_cqring_ev_posted(ctx); | |
09e88404 | 1778 | return all_flushed; |
1d7bb1d5 JA |
1779 | } |
1780 | ||
90f67366 | 1781 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1782 | { |
ca0a2651 JA |
1783 | bool ret = true; |
1784 | ||
5ed7a37d | 1785 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1786 | /* iopoll syncs against uring_lock, not completion_lock */ |
1787 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1788 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1789 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1790 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1791 | mutex_unlock(&ctx->uring_lock); | |
1792 | } | |
ca0a2651 JA |
1793 | |
1794 | return ret; | |
6c503150 PB |
1795 | } |
1796 | ||
6a290a14 PB |
1797 | /* must to be called somewhat shortly after putting a request */ |
1798 | static inline void io_put_task(struct task_struct *task, int nr) | |
1799 | { | |
1800 | struct io_uring_task *tctx = task->io_uring; | |
1801 | ||
e98e49b2 PB |
1802 | if (likely(task == current)) { |
1803 | tctx->cached_refs += nr; | |
1804 | } else { | |
1805 | percpu_counter_sub(&tctx->inflight, nr); | |
1806 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1807 | wake_up(&tctx->wait); | |
1808 | put_task_struct_many(task, nr); | |
1809 | } | |
6a290a14 PB |
1810 | } |
1811 | ||
9a10867a PB |
1812 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1813 | { | |
1814 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1815 | ||
1816 | percpu_counter_add(&tctx->inflight, refill); | |
1817 | refcount_add(refill, ¤t->usage); | |
1818 | tctx->cached_refs += refill; | |
1819 | } | |
1820 | ||
1821 | static inline void io_get_task_refs(int nr) | |
1822 | { | |
1823 | struct io_uring_task *tctx = current->io_uring; | |
1824 | ||
1825 | tctx->cached_refs -= nr; | |
1826 | if (unlikely(tctx->cached_refs < 0)) | |
1827 | io_task_refs_refill(tctx); | |
1828 | } | |
1829 | ||
d4d19c19 | 1830 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1831 | s32 res, u32 cflags) |
2b188cc1 | 1832 | { |
cce4b8b0 | 1833 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1834 | |
cce4b8b0 PB |
1835 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1836 | if (!ocqe) { | |
1837 | /* | |
1838 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1839 | * or cannot allocate an overflow entry, then we need to drop it | |
1840 | * on the floor. | |
1841 | */ | |
8f6ed49a | 1842 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1843 | return false; |
2b188cc1 | 1844 | } |
cce4b8b0 | 1845 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1846 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1847 | WRITE_ONCE(ctx->rings->sq_flags, |
1848 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1849 | ||
cce4b8b0 | 1850 | } |
d4d19c19 | 1851 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1852 | ocqe->cqe.res = res; |
1853 | ocqe->cqe.flags = cflags; | |
1854 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1855 | return true; | |
2b188cc1 JA |
1856 | } |
1857 | ||
913a571a PB |
1858 | static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, |
1859 | s32 res, u32 cflags) | |
2b188cc1 JA |
1860 | { |
1861 | struct io_uring_cqe *cqe; | |
1862 | ||
d4d19c19 | 1863 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1864 | |
2b188cc1 JA |
1865 | /* |
1866 | * If we can't get a cq entry, userspace overflowed the | |
1867 | * submission (by quite a lot). Increment the overflow count in | |
1868 | * the ring. | |
1869 | */ | |
d068b506 | 1870 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1871 | if (likely(cqe)) { |
d4d19c19 | 1872 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1873 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1874 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1875 | return true; |
2b188cc1 | 1876 | } |
d4d19c19 | 1877 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1878 | } |
1879 | ||
913a571a PB |
1880 | static noinline void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
1881 | { | |
04c76b41 PB |
1882 | if (!(req->flags & REQ_F_CQE_SKIP)) |
1883 | __io_fill_cqe(req->ctx, req->user_data, res, cflags); | |
913a571a PB |
1884 | } |
1885 | ||
1886 | static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, | |
1887 | s32 res, u32 cflags) | |
bcda7baa | 1888 | { |
913a571a PB |
1889 | ctx->cq_extra++; |
1890 | return __io_fill_cqe(ctx, user_data, res, cflags); | |
bcda7baa JA |
1891 | } |
1892 | ||
a37fae8a HX |
1893 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, |
1894 | u32 cflags) | |
2b188cc1 | 1895 | { |
78e19bbe | 1896 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1897 | |
04c76b41 PB |
1898 | if (!(req->flags & REQ_F_CQE_SKIP)) |
1899 | __io_fill_cqe(ctx, req->user_data, res, cflags); | |
c7dae4ba JA |
1900 | /* |
1901 | * If we're the last reference to this request, add to our locked | |
1902 | * free_list cache. | |
1903 | */ | |
de9b4cca | 1904 | if (req_ref_put_and_test(req)) { |
7a612350 | 1905 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1906 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1907 | io_disarm_next(req); |
1908 | if (req->link) { | |
1909 | io_req_task_queue(req->link); | |
1910 | req->link = NULL; | |
1911 | } | |
1912 | } | |
ab409402 | 1913 | io_req_put_rsrc(req, ctx); |
c7dae4ba JA |
1914 | io_dismantle_req(req); |
1915 | io_put_task(req->task, 1); | |
c2b6c6bc | 1916 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 1917 | ctx->locked_free_nr++; |
180f829f | 1918 | } |
a37fae8a HX |
1919 | } |
1920 | ||
1921 | static void io_req_complete_post(struct io_kiocb *req, s32 res, | |
1922 | u32 cflags) | |
1923 | { | |
1924 | struct io_ring_ctx *ctx = req->ctx; | |
1925 | ||
1926 | spin_lock(&ctx->completion_lock); | |
1927 | __io_req_complete_post(req, res, cflags); | |
7a612350 | 1928 | io_commit_cqring(ctx); |
79ebeaee | 1929 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 1930 | io_cqring_ev_posted(ctx); |
4e3d9ff9 JA |
1931 | } |
1932 | ||
54daa9b2 PB |
1933 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
1934 | u32 cflags) | |
229a7b63 | 1935 | { |
a38d68db | 1936 | req->result = res; |
d17e56eb | 1937 | req->cflags = cflags; |
e342c807 | 1938 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1939 | } |
1940 | ||
889fca73 | 1941 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 1942 | s32 res, u32 cflags) |
bcda7baa | 1943 | { |
889fca73 PB |
1944 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1945 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1946 | else |
c7dae4ba | 1947 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1948 | } |
1949 | ||
54daa9b2 | 1950 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 1951 | { |
889fca73 | 1952 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1953 | } |
1954 | ||
54daa9b2 | 1955 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 1956 | { |
93d2bcd2 | 1957 | req_set_fail(req); |
f41db273 PB |
1958 | io_req_complete_post(req, res, 0); |
1959 | } | |
1960 | ||
c6d3d9cb PB |
1961 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1962 | { | |
1963 | /* | |
1964 | * We don't submit, fail them all, for that replace hardlinks with | |
1965 | * normal links. Extra REQ_F_LINK is tolerated. | |
1966 | */ | |
1967 | req->flags &= ~REQ_F_HARDLINK; | |
1968 | req->flags |= REQ_F_LINK; | |
1969 | io_req_complete_failed(req, req->result); | |
1970 | } | |
1971 | ||
864ea921 PB |
1972 | /* |
1973 | * Don't initialise the fields below on every allocation, but do that in | |
1974 | * advance and keep them valid across allocations. | |
1975 | */ | |
1976 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1977 | { | |
1978 | req->ctx = ctx; | |
1979 | req->link = NULL; | |
1980 | req->async_data = NULL; | |
1981 | /* not necessary, but safer to zero */ | |
1982 | req->result = 0; | |
1983 | } | |
1984 | ||
dac7a098 | 1985 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1986 | struct io_submit_state *state) |
dac7a098 | 1987 | { |
79ebeaee | 1988 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 1989 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1990 | ctx->locked_free_nr = 0; |
79ebeaee | 1991 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1992 | } |
1993 | ||
dd78f492 | 1994 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1995 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1996 | { |
c7dae4ba | 1997 | struct io_submit_state *state = &ctx->submit_state; |
0ddf92e8 | 1998 | |
c7dae4ba JA |
1999 | /* |
2000 | * If we have more than a batch's worth of requests in our IRQ side | |
2001 | * locked cache, grab the lock and move them over to our submission | |
2002 | * side cache. | |
2003 | */ | |
d0acdee2 | 2004 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 2005 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc | 2006 | return !!state->free_list.next; |
0ddf92e8 JA |
2007 | } |
2008 | ||
5d5901a3 PB |
2009 | /* |
2010 | * A request might get retired back into the request caches even before opcode | |
2011 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
2012 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
2013 | * and with extra caution to not get a request that is still worked on. | |
2014 | */ | |
c072481d | 2015 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 2016 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 2017 | { |
e5d1bc0a | 2018 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 | 2019 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 PB |
2020 | void *reqs[IO_REQ_ALLOC_BATCH]; |
2021 | struct io_kiocb *req; | |
864ea921 | 2022 | int ret, i; |
e5d1bc0a | 2023 | |
c2b6c6bc | 2024 | if (likely(state->free_list.next || io_flush_cached_reqs(ctx))) |
a33ae9ce | 2025 | return true; |
e5d1bc0a | 2026 | |
3ab665b7 | 2027 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 2028 | |
864ea921 PB |
2029 | /* |
2030 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2031 | * retry single alloc to be on the safe side. | |
2032 | */ | |
2033 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
2034 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
2035 | if (!reqs[0]) | |
a33ae9ce | 2036 | return false; |
864ea921 | 2037 | ret = 1; |
2b188cc1 | 2038 | } |
864ea921 | 2039 | |
37f0e767 | 2040 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 PB |
2041 | for (i = 0; i < ret; i++) { |
2042 | req = reqs[i]; | |
2043 | ||
2044 | io_preinit_req(req, ctx); | |
c2b6c6bc | 2045 | wq_stack_add_head(&req->comp_list, &state->free_list); |
3ab665b7 | 2046 | } |
a33ae9ce PB |
2047 | return true; |
2048 | } | |
2049 | ||
2050 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
2051 | { | |
2052 | if (unlikely(!ctx->submit_state.free_list.next)) | |
2053 | return __io_alloc_req_refill(ctx); | |
2054 | return true; | |
2055 | } | |
2056 | ||
2057 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2058 | { | |
2059 | struct io_wq_work_node *node; | |
2060 | ||
2061 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 2062 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
2063 | } |
2064 | ||
e1d767f0 | 2065 | static inline void io_put_file(struct file *file) |
8da11c19 | 2066 | { |
e1d767f0 | 2067 | if (file) |
8da11c19 PB |
2068 | fput(file); |
2069 | } | |
2070 | ||
6b639522 | 2071 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2072 | { |
094bae49 | 2073 | unsigned int flags = req->flags; |
929a3af9 | 2074 | |
867f8fa5 | 2075 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 2076 | io_clean_op(req); |
e1d767f0 PB |
2077 | if (!(flags & REQ_F_FIXED_FILE)) |
2078 | io_put_file(req->file); | |
e65ef56d JA |
2079 | } |
2080 | ||
c072481d | 2081 | static __cold void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2082 | { |
51a4cc11 | 2083 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2084 | |
ab409402 | 2085 | io_req_put_rsrc(req, ctx); |
216578e5 | 2086 | io_dismantle_req(req); |
7c660731 | 2087 | io_put_task(req->task, 1); |
c6ca97b3 | 2088 | |
79ebeaee | 2089 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2090 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2091 | ctx->locked_free_nr++; |
79ebeaee | 2092 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2093 | } |
2094 | ||
f2f87370 PB |
2095 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2096 | { | |
2097 | struct io_kiocb *nxt = req->link; | |
2098 | ||
2099 | req->link = nxt->link; | |
2100 | nxt->link = NULL; | |
2101 | } | |
2102 | ||
33cc89a9 PB |
2103 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2104 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2105 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2106 | { |
33cc89a9 | 2107 | struct io_kiocb *link = req->link; |
f2f87370 | 2108 | |
b97e736a | 2109 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2110 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2111 | |
f2f87370 | 2112 | io_remove_next_linked(req); |
90cd7e42 | 2113 | link->timeout.head = NULL; |
fd9c7bc5 | 2114 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2115 | list_del(&link->timeout.list); |
04c76b41 | 2116 | /* leave REQ_F_CQE_SKIP to io_fill_cqe_req */ |
913a571a | 2117 | io_fill_cqe_req(link, -ECANCELED, 0); |
91c2f697 | 2118 | io_put_req_deferred(link); |
d4729fbd | 2119 | return true; |
c9abd7ad PB |
2120 | } |
2121 | } | |
d4729fbd | 2122 | return false; |
7c86ffee PB |
2123 | } |
2124 | ||
d148ca4b | 2125 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2126 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2127 | { |
33cc89a9 | 2128 | struct io_kiocb *nxt, *link = req->link; |
04c76b41 | 2129 | bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; |
9e645e11 | 2130 | |
f2f87370 | 2131 | req->link = NULL; |
f2f87370 | 2132 | while (link) { |
a8295b98 HX |
2133 | long res = -ECANCELED; |
2134 | ||
2135 | if (link->flags & REQ_F_FAIL) | |
2136 | res = link->result; | |
2137 | ||
f2f87370 PB |
2138 | nxt = link->link; |
2139 | link->link = NULL; | |
2665abfd | 2140 | |
f2f87370 | 2141 | trace_io_uring_fail_link(req, link); |
04c76b41 PB |
2142 | if (!ignore_cqes) { |
2143 | link->flags &= ~REQ_F_CQE_SKIP; | |
2144 | io_fill_cqe_req(link, res, 0); | |
2145 | } | |
91c2f697 | 2146 | io_put_req_deferred(link); |
f2f87370 | 2147 | link = nxt; |
9e645e11 | 2148 | } |
33cc89a9 | 2149 | } |
9e645e11 | 2150 | |
33cc89a9 PB |
2151 | static bool io_disarm_next(struct io_kiocb *req) |
2152 | __must_hold(&req->ctx->completion_lock) | |
2153 | { | |
2154 | bool posted = false; | |
2155 | ||
0756a869 PB |
2156 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2157 | struct io_kiocb *link = req->link; | |
2158 | ||
906c6caa | 2159 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2160 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2161 | io_remove_next_linked(req); | |
04c76b41 | 2162 | /* leave REQ_F_CQE_SKIP to io_fill_cqe_req */ |
913a571a | 2163 | io_fill_cqe_req(link, -ECANCELED, 0); |
0756a869 PB |
2164 | io_put_req_deferred(link); |
2165 | posted = true; | |
2166 | } | |
2167 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2168 | struct io_ring_ctx *ctx = req->ctx; |
2169 | ||
2170 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2171 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2172 | spin_unlock_irq(&ctx->timeout_lock); |
2173 | } | |
93d2bcd2 | 2174 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2175 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2176 | posted |= (req->link != NULL); |
2177 | io_fail_links(req); | |
2178 | } | |
2179 | return posted; | |
9e645e11 JA |
2180 | } |
2181 | ||
d81499bf PB |
2182 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2183 | { | |
2184 | struct io_ring_ctx *ctx = req->ctx; | |
2185 | bool posted; | |
2186 | ||
2187 | spin_lock(&ctx->completion_lock); | |
2188 | posted = io_disarm_next(req); | |
2189 | if (posted) | |
33ce2aff | 2190 | io_commit_cqring(ctx); |
d81499bf PB |
2191 | spin_unlock(&ctx->completion_lock); |
2192 | if (posted) | |
2193 | io_cqring_ev_posted(ctx); | |
2194 | } | |
2195 | ||
2196 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2197 | { |
33cc89a9 | 2198 | struct io_kiocb *nxt; |
944e58bf | 2199 | |
d81499bf PB |
2200 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
2201 | return NULL; | |
9e645e11 JA |
2202 | /* |
2203 | * If LINK is set, we have dependent requests in this chain. If we | |
2204 | * didn't fail this request, queue the first one up, moving any other | |
2205 | * dependencies to the next request. In case of failure, fail the rest | |
2206 | * of the chain. | |
2207 | */ | |
d81499bf PB |
2208 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2209 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2210 | nxt = req->link; |
2211 | req->link = NULL; | |
2212 | return nxt; | |
4d7dd462 | 2213 | } |
9e645e11 | 2214 | |
f237c30a | 2215 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2216 | { |
2217 | if (!ctx) | |
2218 | return; | |
f237c30a | 2219 | if (*locked) { |
c450178d | 2220 | io_submit_flush_completions(ctx); |
2c32395d | 2221 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2222 | *locked = false; |
2c32395d PB |
2223 | } |
2224 | percpu_ref_put(&ctx->refs); | |
2225 | } | |
2226 | ||
f28c240e HX |
2227 | static inline void ctx_commit_and_unlock(struct io_ring_ctx *ctx) |
2228 | { | |
2229 | io_commit_cqring(ctx); | |
2230 | spin_unlock(&ctx->completion_lock); | |
2231 | io_cqring_ev_posted(ctx); | |
2232 | } | |
2233 | ||
2234 | static void handle_prev_tw_list(struct io_wq_work_node *node, | |
2235 | struct io_ring_ctx **ctx, bool *uring_locked) | |
2236 | { | |
2237 | if (*ctx && !*uring_locked) | |
2238 | spin_lock(&(*ctx)->completion_lock); | |
2239 | ||
2240 | do { | |
2241 | struct io_wq_work_node *next = node->next; | |
2242 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2243 | io_task_work.node); | |
2244 | ||
2245 | if (req->ctx != *ctx) { | |
2246 | if (unlikely(!*uring_locked && *ctx)) | |
2247 | ctx_commit_and_unlock(*ctx); | |
2248 | ||
2249 | ctx_flush_and_put(*ctx, uring_locked); | |
2250 | *ctx = req->ctx; | |
2251 | /* if not contended, grab and improve batching */ | |
2252 | *uring_locked = mutex_trylock(&(*ctx)->uring_lock); | |
2253 | percpu_ref_get(&(*ctx)->refs); | |
2254 | if (unlikely(!*uring_locked)) | |
2255 | spin_lock(&(*ctx)->completion_lock); | |
2256 | } | |
2257 | if (likely(*uring_locked)) | |
2258 | req->io_task_work.func(req, uring_locked); | |
2259 | else | |
2260 | __io_req_complete_post(req, req->result, io_put_kbuf(req)); | |
2261 | node = next; | |
2262 | } while (node); | |
2263 | ||
2264 | if (unlikely(!*uring_locked)) | |
2265 | ctx_commit_and_unlock(*ctx); | |
2266 | } | |
2267 | ||
2268 | static void handle_tw_list(struct io_wq_work_node *node, | |
2269 | struct io_ring_ctx **ctx, bool *locked) | |
9f8d032a HX |
2270 | { |
2271 | do { | |
2272 | struct io_wq_work_node *next = node->next; | |
2273 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2274 | io_task_work.node); | |
2275 | ||
2276 | if (req->ctx != *ctx) { | |
2277 | ctx_flush_and_put(*ctx, locked); | |
2278 | *ctx = req->ctx; | |
2279 | /* if not contended, grab and improve batching */ | |
2280 | *locked = mutex_trylock(&(*ctx)->uring_lock); | |
2281 | percpu_ref_get(&(*ctx)->refs); | |
2282 | } | |
2283 | req->io_task_work.func(req, locked); | |
2284 | node = next; | |
2285 | } while (node); | |
2286 | } | |
2287 | ||
7cbf1722 | 2288 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2289 | { |
f28c240e | 2290 | bool uring_locked = false; |
ebd0df2e | 2291 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2292 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2293 | task_work); | |
c40f6379 | 2294 | |
16f72070 | 2295 | while (1) { |
f28c240e | 2296 | struct io_wq_work_node *node1, *node2; |
3f18407d | 2297 | |
f28c240e HX |
2298 | if (!tctx->task_list.first && |
2299 | !tctx->prior_task_list.first && uring_locked) | |
8d4ad41e PB |
2300 | io_submit_flush_completions(ctx); |
2301 | ||
3f18407d | 2302 | spin_lock_irq(&tctx->task_lock); |
f28c240e HX |
2303 | node1 = tctx->prior_task_list.first; |
2304 | node2 = tctx->task_list.first; | |
2305 | INIT_WQ_LIST(&tctx->task_list); | |
2306 | INIT_WQ_LIST(&tctx->prior_task_list); | |
2307 | if (!node2 && !node1) | |
6294f368 | 2308 | tctx->task_running = false; |
3f18407d | 2309 | spin_unlock_irq(&tctx->task_lock); |
f28c240e | 2310 | if (!node2 && !node1) |
6294f368 | 2311 | break; |
3f18407d | 2312 | |
f28c240e HX |
2313 | if (node1) |
2314 | handle_prev_tw_list(node1, &ctx, &uring_locked); | |
2315 | ||
2316 | if (node2) | |
2317 | handle_tw_list(node2, &ctx, &uring_locked); | |
7cbf1722 | 2318 | cond_resched(); |
3f18407d | 2319 | } |
ebd0df2e | 2320 | |
f28c240e | 2321 | ctx_flush_and_put(ctx, &uring_locked); |
7cbf1722 JA |
2322 | } |
2323 | ||
4813c377 | 2324 | static void io_req_task_work_add(struct io_kiocb *req, bool priority) |
7cbf1722 | 2325 | { |
c15b79de | 2326 | struct task_struct *tsk = req->task; |
7cbf1722 | 2327 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2328 | enum task_work_notify_mode notify; |
e09ee510 | 2329 | struct io_wq_work_node *node; |
0b81e80c | 2330 | unsigned long flags; |
6294f368 | 2331 | bool running; |
7cbf1722 JA |
2332 | |
2333 | WARN_ON_ONCE(!tctx); | |
2334 | ||
0b81e80c | 2335 | spin_lock_irqsave(&tctx->task_lock, flags); |
4813c377 HX |
2336 | if (priority) |
2337 | wq_list_add_tail(&req->io_task_work.node, &tctx->prior_task_list); | |
2338 | else | |
2339 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); | |
6294f368 PB |
2340 | running = tctx->task_running; |
2341 | if (!running) | |
2342 | tctx->task_running = true; | |
0b81e80c | 2343 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2344 | |
2345 | /* task_work already pending, we're done */ | |
6294f368 | 2346 | if (running) |
e09ee510 | 2347 | return; |
7cbf1722 | 2348 | |
c15b79de PB |
2349 | /* |
2350 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2351 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2352 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2353 | * will do the job. | |
2354 | */ | |
2355 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
d97ec623 PB |
2356 | if (likely(!task_work_add(tsk, &tctx->task_work, notify))) { |
2357 | if (notify == TWA_NONE) | |
2358 | wake_up_process(tsk); | |
e09ee510 | 2359 | return; |
c15b79de | 2360 | } |
2215bed9 | 2361 | |
0b81e80c | 2362 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2363 | tctx->task_running = false; |
4813c377 | 2364 | node = wq_list_merge(&tctx->prior_task_list, &tctx->task_list); |
0b81e80c | 2365 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2366 | |
e09ee510 PB |
2367 | while (node) { |
2368 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2369 | node = node->next; | |
2370 | if (llist_add(&req->io_task_work.fallback_node, | |
2371 | &req->ctx->fallback_llist)) | |
2372 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2373 | } | |
eab30c4d PB |
2374 | } |
2375 | ||
f237c30a | 2376 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2377 | { |
87ceb6a6 | 2378 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2379 | |
b18a1a45 | 2380 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2381 | io_tw_lock(ctx, locked); |
2593553a | 2382 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2383 | } |
2384 | ||
f237c30a | 2385 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2386 | { |
2387 | struct io_ring_ctx *ctx = req->ctx; | |
2388 | ||
f237c30a | 2389 | io_tw_lock(ctx, locked); |
316319e8 | 2390 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2391 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2392 | __io_queue_sqe(req); |
81b6d05c | 2393 | else |
2593553a | 2394 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2395 | } |
2396 | ||
2c4b8eb6 | 2397 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2398 | { |
2c4b8eb6 | 2399 | req->result = ret; |
5b0a6acc | 2400 | req->io_task_work.func = io_req_task_cancel; |
4813c377 | 2401 | io_req_task_work_add(req, false); |
c40f6379 JA |
2402 | } |
2403 | ||
2c4b8eb6 | 2404 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2405 | { |
5b0a6acc | 2406 | req->io_task_work.func = io_req_task_submit; |
4813c377 | 2407 | io_req_task_work_add(req, false); |
a3df7698 PB |
2408 | } |
2409 | ||
773af691 JA |
2410 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2411 | { | |
2412 | req->io_task_work.func = io_queue_async_work; | |
4813c377 | 2413 | io_req_task_work_add(req, false); |
773af691 JA |
2414 | } |
2415 | ||
f2f87370 | 2416 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2417 | { |
9b5f7bd9 | 2418 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2419 | |
2420 | if (nxt) | |
906a8c3f | 2421 | io_req_task_queue(nxt); |
c69f8dbe JL |
2422 | } |
2423 | ||
c3524383 | 2424 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2425 | { |
c3524383 PB |
2426 | io_queue_next(req); |
2427 | __io_free_req(req); | |
2428 | } | |
8766dd51 | 2429 | |
f237c30a PB |
2430 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2431 | { | |
2432 | io_free_req(req); | |
2433 | } | |
2434 | ||
3aa83bfb | 2435 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 2436 | struct io_wq_work_node *node) |
3aa83bfb | 2437 | __must_hold(&ctx->uring_lock) |
5af1d13e | 2438 | { |
d4b7a5ef | 2439 | struct task_struct *task = NULL; |
37f0e767 | 2440 | int task_refs = 0; |
5af1d13e | 2441 | |
3aa83bfb PB |
2442 | do { |
2443 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2444 | comp_list); | |
2d6500d4 | 2445 | |
def77acf | 2446 | if (unlikely(req->flags & REQ_F_REFCOUNT)) { |
c1e53a69 | 2447 | node = req->comp_list.next; |
def77acf PB |
2448 | if (!req_ref_put_and_test(req)) |
2449 | continue; | |
c1e53a69 | 2450 | } |
2d6500d4 | 2451 | |
ab409402 | 2452 | io_req_put_rsrc_locked(req, ctx); |
d4b7a5ef PB |
2453 | io_queue_next(req); |
2454 | io_dismantle_req(req); | |
5af1d13e | 2455 | |
d4b7a5ef PB |
2456 | if (req->task != task) { |
2457 | if (task) | |
2458 | io_put_task(task, task_refs); | |
2459 | task = req->task; | |
2460 | task_refs = 0; | |
2461 | } | |
2462 | task_refs++; | |
c1e53a69 | 2463 | node = req->comp_list.next; |
d4b7a5ef | 2464 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
3aa83bfb | 2465 | } while (node); |
d4b7a5ef | 2466 | |
d4b7a5ef PB |
2467 | if (task) |
2468 | io_put_task(task, task_refs); | |
7a743e22 PB |
2469 | } |
2470 | ||
c450178d | 2471 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2472 | __must_hold(&ctx->uring_lock) |
905c172f | 2473 | { |
6f33b0bc | 2474 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 2475 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 2476 | |
3d4aeb9f PB |
2477 | if (state->flush_cqes) { |
2478 | spin_lock(&ctx->completion_lock); | |
2479 | wq_list_for_each(node, prev, &state->compl_reqs) { | |
2480 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
6f33b0bc | 2481 | comp_list); |
5182ed2e | 2482 | |
3d4aeb9f PB |
2483 | if (!(req->flags & REQ_F_CQE_SKIP)) |
2484 | __io_fill_cqe(ctx, req->user_data, req->result, | |
2485 | req->cflags); | |
2486 | } | |
2487 | ||
2488 | io_commit_cqring(ctx); | |
2489 | spin_unlock(&ctx->completion_lock); | |
2490 | io_cqring_ev_posted(ctx); | |
2491 | state->flush_cqes = false; | |
905c172f | 2492 | } |
5182ed2e | 2493 | |
1cce17ac | 2494 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 2495 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
2496 | } |
2497 | ||
ba816ad6 JA |
2498 | /* |
2499 | * Drop reference to request, return next in chain (if there is one) if this | |
2500 | * was the last reference to this request. | |
2501 | */ | |
0d85035a | 2502 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2503 | { |
9b5f7bd9 PB |
2504 | struct io_kiocb *nxt = NULL; |
2505 | ||
de9b4cca | 2506 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2507 | nxt = io_req_find_next(req); |
4d7dd462 | 2508 | __io_free_req(req); |
2a44f467 | 2509 | } |
9b5f7bd9 | 2510 | return nxt; |
2b188cc1 JA |
2511 | } |
2512 | ||
0d85035a | 2513 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2514 | { |
de9b4cca | 2515 | if (req_ref_put_and_test(req)) |
e65ef56d | 2516 | io_free_req(req); |
2b188cc1 JA |
2517 | } |
2518 | ||
91c2f697 | 2519 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2520 | { |
91c2f697 | 2521 | if (req_ref_put_and_test(req)) { |
f237c30a | 2522 | req->io_task_work.func = io_free_req_work; |
4813c377 | 2523 | io_req_task_work_add(req, false); |
543af3a1 | 2524 | } |
216578e5 PB |
2525 | } |
2526 | ||
6c503150 | 2527 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2528 | { |
2529 | /* See comment at the top of this file */ | |
2530 | smp_rmb(); | |
e23de15f | 2531 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2532 | } |
2533 | ||
fb5ccc98 PB |
2534 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2535 | { | |
2536 | struct io_rings *rings = ctx->rings; | |
2537 | ||
2538 | /* make sure SQ entry isn't read before tail */ | |
2539 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2540 | } | |
2541 | ||
4c6e277c JA |
2542 | static inline bool io_run_task_work(void) |
2543 | { | |
ef98eb04 | 2544 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2545 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2546 | tracehook_notify_signal(); |
4c6e277c JA |
2547 | return true; |
2548 | } | |
2549 | ||
2550 | return false; | |
bcda7baa JA |
2551 | } |
2552 | ||
5ba3c874 | 2553 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 2554 | { |
5eef4e87 | 2555 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 2556 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 2557 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 2558 | int nr_events = 0; |
def596e9 JA |
2559 | |
2560 | /* | |
2561 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 2562 | * off our complete list. |
def596e9 | 2563 | */ |
87a115fb | 2564 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 2565 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2566 | |
5eef4e87 PB |
2567 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
2568 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 2569 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2570 | int ret; |
def596e9 JA |
2571 | |
2572 | /* | |
581f9810 BM |
2573 | * Move completed and retryable entries to our local lists. |
2574 | * If we find a request that requires polling, break out | |
2575 | * and complete those lists first, if we have entries there. | |
def596e9 | 2576 | */ |
e3f721e6 | 2577 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2578 | break; |
2579 | ||
b688f11e | 2580 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
2581 | if (unlikely(ret < 0)) |
2582 | return ret; | |
2583 | else if (ret) | |
ef99b2d3 | 2584 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2585 | |
3aadc23e | 2586 | /* iopoll may have completed current req */ |
b688f11e JA |
2587 | if (!rq_list_empty(iob.req_list) || |
2588 | READ_ONCE(req->iopoll_completed)) | |
e3f721e6 | 2589 | break; |
def596e9 JA |
2590 | } |
2591 | ||
b688f11e JA |
2592 | if (!rq_list_empty(iob.req_list)) |
2593 | iob.complete(&iob); | |
5eef4e87 PB |
2594 | else if (!pos) |
2595 | return 0; | |
def596e9 | 2596 | |
5eef4e87 PB |
2597 | prev = start; |
2598 | wq_list_for_each_resume(pos, prev) { | |
2599 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
2600 | ||
b3fa03fd PB |
2601 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
2602 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 2603 | break; |
83a13a41 PB |
2604 | if (unlikely(req->flags & REQ_F_CQE_SKIP)) |
2605 | continue; | |
d1fd1c20 | 2606 | |
83a13a41 | 2607 | __io_fill_cqe(ctx, req->user_data, req->result, io_put_kbuf(req)); |
e3f721e6 PB |
2608 | nr_events++; |
2609 | } | |
def596e9 | 2610 | |
f5ed3bcd PB |
2611 | if (unlikely(!nr_events)) |
2612 | return 0; | |
2613 | ||
2614 | io_commit_cqring(ctx); | |
2615 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 2616 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 2617 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 2618 | io_free_batch_list(ctx, pos); |
5ba3c874 | 2619 | return nr_events; |
def596e9 JA |
2620 | } |
2621 | ||
def596e9 JA |
2622 | /* |
2623 | * We can't just wait for polled events to come to us, we have to actively | |
2624 | * find and complete them. | |
2625 | */ | |
c072481d | 2626 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2627 | { |
2628 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2629 | return; | |
2630 | ||
2631 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 2632 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 2633 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 2634 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 2635 | break; |
08f5439f JA |
2636 | /* |
2637 | * Ensure we allow local-to-the-cpu processing to take place, | |
2638 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2639 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2640 | */ |
3fcee5a6 PB |
2641 | if (need_resched()) { |
2642 | mutex_unlock(&ctx->uring_lock); | |
2643 | cond_resched(); | |
2644 | mutex_lock(&ctx->uring_lock); | |
2645 | } | |
def596e9 JA |
2646 | } |
2647 | mutex_unlock(&ctx->uring_lock); | |
2648 | } | |
2649 | ||
7668b92a | 2650 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2651 | { |
7668b92a | 2652 | unsigned int nr_events = 0; |
e9979b36 | 2653 | int ret = 0; |
500f9fba | 2654 | |
c7849be9 XW |
2655 | /* |
2656 | * We disallow the app entering submit/complete with polling, but we | |
2657 | * still need to lock the ring to prevent racing with polled issue | |
2658 | * that got punted to a workqueue. | |
2659 | */ | |
2660 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2661 | /* |
2662 | * Don't enter poll loop if we already have events pending. | |
2663 | * If we do, we can potentially be spinning for commands that | |
2664 | * already triggered a CQE (eg in error). | |
2665 | */ | |
5ed7a37d | 2666 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2667 | __io_cqring_overflow_flush(ctx, false); |
2668 | if (io_cqring_events(ctx)) | |
2669 | goto out; | |
def596e9 | 2670 | do { |
500f9fba JA |
2671 | /* |
2672 | * If a submit got punted to a workqueue, we can have the | |
2673 | * application entering polling for a command before it gets | |
2674 | * issued. That app will hold the uring_lock for the duration | |
2675 | * of the poll right here, so we need to take a breather every | |
2676 | * now and then to ensure that the issue has a chance to add | |
2677 | * the poll to the issued list. Otherwise we can spin here | |
2678 | * forever, while the workqueue is stuck trying to acquire the | |
2679 | * very same mutex. | |
2680 | */ | |
5eef4e87 | 2681 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2682 | u32 tail = ctx->cached_cq_tail; |
2683 | ||
500f9fba | 2684 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2685 | io_run_task_work(); |
500f9fba | 2686 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2687 | |
8f487ef2 PB |
2688 | /* some requests don't go through iopoll_list */ |
2689 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 2690 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 2691 | break; |
500f9fba | 2692 | } |
5ba3c874 PB |
2693 | ret = io_do_iopoll(ctx, !min); |
2694 | if (ret < 0) | |
2695 | break; | |
2696 | nr_events += ret; | |
2697 | ret = 0; | |
2698 | } while (nr_events < min && !need_resched()); | |
f39c8a5b | 2699 | out: |
500f9fba | 2700 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2701 | return ret; |
2702 | } | |
2703 | ||
491381ce | 2704 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2705 | { |
491381ce JA |
2706 | /* |
2707 | * Tell lockdep we inherited freeze protection from submission | |
2708 | * thread. | |
2709 | */ | |
2710 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2711 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2712 | |
1c98679d PB |
2713 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2714 | sb_end_write(sb); | |
2b188cc1 JA |
2715 | } |
2716 | } | |
2717 | ||
b63534c4 | 2718 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2719 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2720 | { |
ab454438 | 2721 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2722 | |
d886e185 | 2723 | if (!req_has_async_data(req)) |
ab454438 | 2724 | return !io_req_prep_async(req); |
538941e2 | 2725 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 2726 | return true; |
b63534c4 | 2727 | } |
b63534c4 | 2728 | |
3e6a0d3c | 2729 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2730 | { |
355afaeb | 2731 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2732 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2733 | |
355afaeb JA |
2734 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2735 | return false; | |
3e6a0d3c JA |
2736 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2737 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2738 | return false; |
7c977a58 JA |
2739 | /* |
2740 | * If ref is dying, we might be running poll reap from the exit work. | |
2741 | * Don't attempt to reissue from that path, just let it fail with | |
2742 | * -EAGAIN. | |
2743 | */ | |
3e6a0d3c JA |
2744 | if (percpu_ref_is_dying(&ctx->refs)) |
2745 | return false; | |
ef046888 JA |
2746 | /* |
2747 | * Play it safe and assume not safe to re-import and reissue if we're | |
2748 | * not in the original thread group (or in task context). | |
2749 | */ | |
2750 | if (!same_thread_group(req->task, current) || !in_task()) | |
2751 | return false; | |
3e6a0d3c JA |
2752 | return true; |
2753 | } | |
e82ad485 | 2754 | #else |
a1ff1e3f | 2755 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2756 | { |
2757 | return false; | |
2758 | } | |
e82ad485 | 2759 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2760 | { |
b63534c4 JA |
2761 | return false; |
2762 | } | |
3e6a0d3c | 2763 | #endif |
b63534c4 | 2764 | |
8ef12efe | 2765 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2766 | { |
b65c128f PB |
2767 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2768 | kiocb_end_write(req); | |
258f3a7f | 2769 | if (unlikely(res != req->result)) { |
9532b99b PB |
2770 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
2771 | io_rw_should_reissue(req)) { | |
2772 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2773 | return true; |
9532b99b | 2774 | } |
93d2bcd2 | 2775 | req_set_fail(req); |
8ef12efe | 2776 | req->result = res; |
9532b99b | 2777 | } |
8ef12efe JA |
2778 | return false; |
2779 | } | |
2780 | ||
f237c30a | 2781 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2782 | { |
d1fd1c20 | 2783 | unsigned int cflags = io_put_kbuf(req); |
54daa9b2 | 2784 | int res = req->result; |
126180b9 PB |
2785 | |
2786 | if (*locked) { | |
126180b9 | 2787 | io_req_complete_state(req, res, cflags); |
fff4e40e | 2788 | io_req_add_compl_list(req); |
126180b9 PB |
2789 | } else { |
2790 | io_req_complete_post(req, res, cflags); | |
2791 | } | |
8ef12efe JA |
2792 | } |
2793 | ||
2794 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2795 | unsigned int issue_flags) | |
2796 | { | |
2797 | if (__io_complete_rw_common(req, res)) | |
2798 | return; | |
d1fd1c20 | 2799 | __io_req_complete(req, issue_flags, req->result, io_put_kbuf(req)); |
ba816ad6 JA |
2800 | } |
2801 | ||
6b19b766 | 2802 | static void io_complete_rw(struct kiocb *kiocb, long res) |
ba816ad6 | 2803 | { |
9adbd45d | 2804 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2805 | |
8ef12efe JA |
2806 | if (__io_complete_rw_common(req, res)) |
2807 | return; | |
2808 | req->result = res; | |
2809 | req->io_task_work.func = io_req_task_complete; | |
f28c240e | 2810 | io_req_task_work_add(req, !!(req->ctx->flags & IORING_SETUP_SQPOLL)); |
2b188cc1 JA |
2811 | } |
2812 | ||
6b19b766 | 2813 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) |
def596e9 | 2814 | { |
9adbd45d | 2815 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2816 | |
491381ce JA |
2817 | if (kiocb->ki_flags & IOCB_WRITE) |
2818 | kiocb_end_write(req); | |
9532b99b | 2819 | if (unlikely(res != req->result)) { |
b66ceaf3 PB |
2820 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
2821 | req->flags |= REQ_F_REISSUE; | |
2822 | return; | |
9532b99b | 2823 | } |
258f3a7f | 2824 | req->result = res; |
8c130827 | 2825 | } |
bbde017a | 2826 | |
b3fa03fd PB |
2827 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
2828 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
2829 | } |
2830 | ||
2831 | /* | |
2832 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2833 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2834 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2835 | * accessing the kiocb cookie. |
2836 | */ | |
9882131c | 2837 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
2838 | { |
2839 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 2840 | const bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
cb3d8972 PB |
2841 | |
2842 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
3b44b371 | 2843 | if (unlikely(needs_lock)) |
cb3d8972 | 2844 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
2845 | |
2846 | /* | |
2847 | * Track whether we have multiple files in our lists. This will impact | |
2848 | * how we do polling eventually, not spinning if we're on potentially | |
2849 | * different devices. | |
2850 | */ | |
5eef4e87 | 2851 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2852 | ctx->poll_multi_queue = false; |
2853 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
2854 | struct io_kiocb *list_req; |
2855 | ||
5eef4e87 PB |
2856 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
2857 | comp_list); | |
30da1b45 | 2858 | if (list_req->file != req->file) |
915b3dde | 2859 | ctx->poll_multi_queue = true; |
def596e9 JA |
2860 | } |
2861 | ||
2862 | /* | |
2863 | * For fast devices, IO may have already completed. If it has, add | |
2864 | * it to the front so we find it first. | |
2865 | */ | |
65a6543d | 2866 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 2867 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 2868 | else |
5eef4e87 | 2869 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 2870 | |
3b44b371 | 2871 | if (unlikely(needs_lock)) { |
cb3d8972 PB |
2872 | /* |
2873 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2874 | * in sq thread task context or in io worker task context. If | |
2875 | * current task context is sq thread, we don't need to check | |
2876 | * whether should wake up sq thread. | |
2877 | */ | |
2878 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2879 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2880 | wake_up(&ctx->sq_data->wait); | |
2881 | ||
2882 | mutex_unlock(&ctx->uring_lock); | |
2883 | } | |
def596e9 JA |
2884 | } |
2885 | ||
4503b767 JA |
2886 | static bool io_bdev_nowait(struct block_device *bdev) |
2887 | { | |
9ba0d0c8 | 2888 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2889 | } |
2890 | ||
2b188cc1 JA |
2891 | /* |
2892 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2893 | * any file. For now, just ensure that anything potentially problematic is done | |
2894 | * inline. | |
2895 | */ | |
88459b50 | 2896 | static bool __io_file_supports_nowait(struct file *file, umode_t mode) |
2b188cc1 | 2897 | { |
4503b767 | 2898 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2899 | if (IS_ENABLED(CONFIG_BLOCK) && |
2900 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2901 | return true; |
2902 | return false; | |
2903 | } | |
976517f1 | 2904 | if (S_ISSOCK(mode)) |
2b188cc1 | 2905 | return true; |
4503b767 | 2906 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2907 | if (IS_ENABLED(CONFIG_BLOCK) && |
2908 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2909 | file->f_op != &io_uring_fops) |
2910 | return true; | |
2911 | return false; | |
2912 | } | |
2b188cc1 | 2913 | |
c5b85625 JA |
2914 | /* any ->read/write should understand O_NONBLOCK */ |
2915 | if (file->f_flags & O_NONBLOCK) | |
2916 | return true; | |
35645ac3 | 2917 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 | 2918 | } |
c5b85625 | 2919 | |
88459b50 PB |
2920 | /* |
2921 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2922 | * any file. For now, just ensure that anything potentially problematic is done | |
2923 | * inline. | |
2924 | */ | |
2925 | static unsigned int io_file_get_flags(struct file *file) | |
2926 | { | |
2927 | umode_t mode = file_inode(file)->i_mode; | |
2928 | unsigned int res = 0; | |
af197f50 | 2929 | |
88459b50 PB |
2930 | if (S_ISREG(mode)) |
2931 | res |= FFS_ISREG; | |
2932 | if (__io_file_supports_nowait(file, mode)) | |
2933 | res |= FFS_NOWAIT; | |
2934 | return res; | |
2b188cc1 JA |
2935 | } |
2936 | ||
35645ac3 | 2937 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 2938 | { |
88459b50 | 2939 | return req->flags & REQ_F_SUPPORT_NOWAIT; |
7b29f92d JA |
2940 | } |
2941 | ||
b9a6b8f9 | 2942 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2943 | { |
def596e9 | 2944 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2945 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2946 | struct file *file = req->file; |
09bb8394 JA |
2947 | unsigned ioprio; |
2948 | int ret; | |
2b188cc1 | 2949 | |
88459b50 PB |
2950 | if (!io_req_ffs_set(req)) |
2951 | req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; | |
491381ce | 2952 | |
2b188cc1 | 2953 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2954 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2955 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2956 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2957 | } |
5cb03d63 | 2958 | kiocb->ki_flags = iocb_flags(file); |
3e577dcd PB |
2959 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); |
2960 | if (unlikely(ret)) | |
2961 | return ret; | |
2b188cc1 | 2962 | |
5d329e12 JA |
2963 | /* |
2964 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
2965 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
2966 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
2967 | */ | |
2968 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
35645ac3 | 2969 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) |
75c668cd PB |
2970 | req->flags |= REQ_F_NOWAIT; |
2971 | ||
def596e9 | 2972 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
5cb03d63 | 2973 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) |
09bb8394 | 2974 | return -EOPNOTSUPP; |
2b188cc1 | 2975 | |
394918eb | 2976 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
def596e9 | 2977 | kiocb->ki_complete = io_complete_rw_iopoll; |
65a6543d | 2978 | req->iopoll_completed = 0; |
def596e9 | 2979 | } else { |
09bb8394 JA |
2980 | if (kiocb->ki_flags & IOCB_HIPRI) |
2981 | return -EINVAL; | |
def596e9 JA |
2982 | kiocb->ki_complete = io_complete_rw; |
2983 | } | |
9adbd45d | 2984 | |
fb27274a PB |
2985 | ioprio = READ_ONCE(sqe->ioprio); |
2986 | if (ioprio) { | |
2987 | ret = ioprio_check_cap(ioprio); | |
2988 | if (ret) | |
2989 | return ret; | |
2990 | ||
2991 | kiocb->ki_ioprio = ioprio; | |
2992 | } else { | |
2993 | kiocb->ki_ioprio = get_current_ioprio(); | |
eae071c9 PB |
2994 | } |
2995 | ||
578c0ee2 | 2996 | req->imu = NULL; |
3529d8c2 JA |
2997 | req->rw.addr = READ_ONCE(sqe->addr); |
2998 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2999 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3000 | return 0; |
2b188cc1 JA |
3001 | } |
3002 | ||
3003 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3004 | { | |
3005 | switch (ret) { | |
3006 | case -EIOCBQUEUED: | |
3007 | break; | |
3008 | case -ERESTARTSYS: | |
3009 | case -ERESTARTNOINTR: | |
3010 | case -ERESTARTNOHAND: | |
3011 | case -ERESTART_RESTARTBLOCK: | |
3012 | /* | |
3013 | * We can't just restart the syscall, since previously | |
3014 | * submitted sqes may already be in progress. Just fail this | |
3015 | * IO with EINTR. | |
3016 | */ | |
3017 | ret = -EINTR; | |
df561f66 | 3018 | fallthrough; |
2b188cc1 | 3019 | default: |
6b19b766 | 3020 | kiocb->ki_complete(kiocb, ret); |
2b188cc1 JA |
3021 | } |
3022 | } | |
3023 | ||
2ea537ca | 3024 | static void kiocb_done(struct io_kiocb *req, ssize_t ret, |
889fca73 | 3025 | unsigned int issue_flags) |
ba816ad6 | 3026 | { |
e8c2bc1f | 3027 | struct io_async_rw *io = req->async_data; |
ba04291e | 3028 | |
227c0c96 | 3029 | /* add previously done IO, if any */ |
d886e185 | 3030 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 3031 | if (ret < 0) |
e8c2bc1f | 3032 | ret = io->bytes_done; |
227c0c96 | 3033 | else |
e8c2bc1f | 3034 | ret += io->bytes_done; |
227c0c96 JA |
3035 | } |
3036 | ||
ba04291e | 3037 | if (req->flags & REQ_F_CUR_POS) |
2ea537ca PB |
3038 | req->file->f_pos = req->rw.kiocb.ki_pos; |
3039 | if (ret >= 0 && (req->rw.kiocb.ki_complete == io_complete_rw)) | |
889fca73 | 3040 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 | 3041 | else |
2ea537ca | 3042 | io_rw_done(&req->rw.kiocb, ret); |
97284637 | 3043 | |
b66ceaf3 | 3044 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 3045 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 3046 | if (io_resubmit_prep(req)) { |
773af691 | 3047 | io_req_task_queue_reissue(req); |
8c130827 | 3048 | } else { |
93d2bcd2 | 3049 | req_set_fail(req); |
06bdea20 PB |
3050 | req->result = ret; |
3051 | req->io_task_work.func = io_req_task_complete; | |
4813c377 | 3052 | io_req_task_work_add(req, false); |
97284637 PB |
3053 | } |
3054 | } | |
ba816ad6 JA |
3055 | } |
3056 | ||
eae071c9 PB |
3057 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3058 | struct io_mapped_ubuf *imu) | |
edafccee | 3059 | { |
9adbd45d | 3060 | size_t len = req->rw.len; |
75769e3f | 3061 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 3062 | size_t offset; |
edafccee | 3063 | |
75769e3f | 3064 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
3065 | return -EFAULT; |
3066 | /* not inside the mapped region */ | |
4751f53d | 3067 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
3068 | return -EFAULT; |
3069 | ||
3070 | /* | |
3071 | * May not be a start of buffer, set size appropriately | |
3072 | * and advance us to the beginning. | |
3073 | */ | |
3074 | offset = buf_addr - imu->ubuf; | |
3075 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3076 | |
3077 | if (offset) { | |
3078 | /* | |
3079 | * Don't use iov_iter_advance() here, as it's really slow for | |
3080 | * using the latter parts of a big fixed buffer - it iterates | |
3081 | * over each segment manually. We can cheat a bit here, because | |
3082 | * we know that: | |
3083 | * | |
3084 | * 1) it's a BVEC iter, we set it up | |
3085 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3086 | * first and last bvec | |
3087 | * | |
3088 | * So just find our index, and adjust the iterator afterwards. | |
3089 | * If the offset is within the first bvec (or the whole first | |
3090 | * bvec, just use iov_iter_advance(). This makes it easier | |
3091 | * since we can just skip the first segment, which may not | |
3092 | * be PAGE_SIZE aligned. | |
3093 | */ | |
3094 | const struct bio_vec *bvec = imu->bvec; | |
3095 | ||
3096 | if (offset <= bvec->bv_len) { | |
3097 | iov_iter_advance(iter, offset); | |
3098 | } else { | |
3099 | unsigned long seg_skip; | |
3100 | ||
3101 | /* skip first vec */ | |
3102 | offset -= bvec->bv_len; | |
3103 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3104 | ||
3105 | iter->bvec = bvec + seg_skip; | |
3106 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3107 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3108 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3109 | } |
3110 | } | |
3111 | ||
847595de | 3112 | return 0; |
edafccee JA |
3113 | } |
3114 | ||
eae071c9 PB |
3115 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
3116 | { | |
eae071c9 PB |
3117 | struct io_mapped_ubuf *imu = req->imu; |
3118 | u16 index, buf_index = req->buf_index; | |
3119 | ||
3120 | if (likely(!imu)) { | |
578c0ee2 PB |
3121 | struct io_ring_ctx *ctx = req->ctx; |
3122 | ||
eae071c9 PB |
3123 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3124 | return -EFAULT; | |
578c0ee2 | 3125 | io_req_set_rsrc_node(req, ctx); |
eae071c9 PB |
3126 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3127 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3128 | req->imu = imu; | |
3129 | } | |
3130 | return __io_import_fixed(req, rw, iter, imu); | |
3131 | } | |
3132 | ||
bcda7baa JA |
3133 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3134 | { | |
3135 | if (needs_lock) | |
3136 | mutex_unlock(&ctx->uring_lock); | |
3137 | } | |
3138 | ||
3139 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3140 | { | |
3141 | /* | |
3142 | * "Normal" inline submissions always hold the uring_lock, since we | |
3143 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3144 | * The only exception is when we've detached the request and issue it | |
3145 | * from an async worker thread, grab the lock for that case. | |
3146 | */ | |
3147 | if (needs_lock) | |
3148 | mutex_lock(&ctx->uring_lock); | |
3149 | } | |
3150 | ||
3151 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
51aac424 | 3152 | int bgid, unsigned int issue_flags) |
bcda7baa | 3153 | { |
30d51dd4 | 3154 | struct io_buffer *kbuf = req->kbuf; |
bcda7baa | 3155 | struct io_buffer *head; |
3b44b371 | 3156 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
bcda7baa JA |
3157 | |
3158 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3159 | return kbuf; | |
3160 | ||
3161 | io_ring_submit_lock(req->ctx, needs_lock); | |
3162 | ||
3163 | lockdep_assert_held(&req->ctx->uring_lock); | |
3164 | ||
9e15c3a0 | 3165 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3166 | if (head) { |
3167 | if (!list_empty(&head->list)) { | |
3168 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3169 | list); | |
3170 | list_del(&kbuf->list); | |
3171 | } else { | |
3172 | kbuf = head; | |
9e15c3a0 | 3173 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3174 | } |
3175 | if (*len > kbuf->len) | |
3176 | *len = kbuf->len; | |
30d51dd4 PB |
3177 | req->flags |= REQ_F_BUFFER_SELECTED; |
3178 | req->kbuf = kbuf; | |
bcda7baa JA |
3179 | } else { |
3180 | kbuf = ERR_PTR(-ENOBUFS); | |
3181 | } | |
3182 | ||
3183 | io_ring_submit_unlock(req->ctx, needs_lock); | |
bcda7baa JA |
3184 | return kbuf; |
3185 | } | |
3186 | ||
4d954c25 | 3187 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3188 | unsigned int issue_flags) |
4d954c25 JA |
3189 | { |
3190 | struct io_buffer *kbuf; | |
4f4eeba8 | 3191 | u16 bgid; |
4d954c25 | 3192 | |
4f4eeba8 | 3193 | bgid = req->buf_index; |
51aac424 | 3194 | kbuf = io_buffer_select(req, len, bgid, issue_flags); |
4d954c25 JA |
3195 | if (IS_ERR(kbuf)) |
3196 | return kbuf; | |
4d954c25 JA |
3197 | return u64_to_user_ptr(kbuf->addr); |
3198 | } | |
3199 | ||
3200 | #ifdef CONFIG_COMPAT | |
3201 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3202 | unsigned int issue_flags) |
4d954c25 JA |
3203 | { |
3204 | struct compat_iovec __user *uiov; | |
3205 | compat_ssize_t clen; | |
3206 | void __user *buf; | |
3207 | ssize_t len; | |
3208 | ||
3209 | uiov = u64_to_user_ptr(req->rw.addr); | |
3210 | if (!access_ok(uiov, sizeof(*uiov))) | |
3211 | return -EFAULT; | |
3212 | if (__get_user(clen, &uiov->iov_len)) | |
3213 | return -EFAULT; | |
3214 | if (clen < 0) | |
3215 | return -EINVAL; | |
3216 | ||
3217 | len = clen; | |
51aac424 | 3218 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3219 | if (IS_ERR(buf)) |
3220 | return PTR_ERR(buf); | |
3221 | iov[0].iov_base = buf; | |
3222 | iov[0].iov_len = (compat_size_t) len; | |
3223 | return 0; | |
3224 | } | |
3225 | #endif | |
3226 | ||
3227 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3228 | unsigned int issue_flags) |
4d954c25 JA |
3229 | { |
3230 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3231 | void __user *buf; | |
3232 | ssize_t len; | |
3233 | ||
3234 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3235 | return -EFAULT; | |
3236 | ||
3237 | len = iov[0].iov_len; | |
3238 | if (len < 0) | |
3239 | return -EINVAL; | |
51aac424 | 3240 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3241 | if (IS_ERR(buf)) |
3242 | return PTR_ERR(buf); | |
3243 | iov[0].iov_base = buf; | |
3244 | iov[0].iov_len = len; | |
3245 | return 0; | |
3246 | } | |
3247 | ||
3248 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3249 | unsigned int issue_flags) |
4d954c25 | 3250 | { |
dddb3e26 | 3251 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 | 3252 | struct io_buffer *kbuf = req->kbuf; |
dddb3e26 | 3253 | |
dddb3e26 JA |
3254 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
3255 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3256 | return 0; |
dddb3e26 | 3257 | } |
dd201662 | 3258 | if (req->rw.len != 1) |
4d954c25 JA |
3259 | return -EINVAL; |
3260 | ||
3261 | #ifdef CONFIG_COMPAT | |
3262 | if (req->ctx->compat) | |
51aac424 | 3263 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
3264 | #endif |
3265 | ||
51aac424 | 3266 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
3267 | } |
3268 | ||
caa8fe6e PB |
3269 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
3270 | struct io_rw_state *s, | |
3271 | unsigned int issue_flags) | |
2b188cc1 | 3272 | { |
5e49c973 | 3273 | struct iov_iter *iter = &s->iter; |
847595de | 3274 | u8 opcode = req->opcode; |
caa8fe6e | 3275 | struct iovec *iovec; |
d1d681b0 PB |
3276 | void __user *buf; |
3277 | size_t sqe_len; | |
4d954c25 | 3278 | ssize_t ret; |
edafccee | 3279 | |
f3251183 PB |
3280 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
3281 | ret = io_import_fixed(req, rw, iter); | |
3282 | if (ret) | |
3283 | return ERR_PTR(ret); | |
3284 | return NULL; | |
3285 | } | |
2b188cc1 | 3286 | |
bcda7baa | 3287 | /* buffer index only valid with fixed read/write, or buffer select */ |
d1d681b0 | 3288 | if (unlikely(req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))) |
caa8fe6e | 3289 | return ERR_PTR(-EINVAL); |
9adbd45d | 3290 | |
d1d681b0 PB |
3291 | buf = u64_to_user_ptr(req->rw.addr); |
3292 | sqe_len = req->rw.len; | |
9adbd45d | 3293 | |
3a6820f2 | 3294 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3295 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 3296 | buf = io_rw_buffer_select(req, &sqe_len, issue_flags); |
867a23ea | 3297 | if (IS_ERR(buf)) |
898df244 | 3298 | return ERR_CAST(buf); |
3f9d6441 | 3299 | req->rw.len = sqe_len; |
bcda7baa JA |
3300 | } |
3301 | ||
5e49c973 | 3302 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
f3251183 PB |
3303 | if (ret) |
3304 | return ERR_PTR(ret); | |
3305 | return NULL; | |
3a6820f2 JA |
3306 | } |
3307 | ||
caa8fe6e | 3308 | iovec = s->fast_iov; |
4d954c25 | 3309 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 3310 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
f3251183 PB |
3311 | if (ret) |
3312 | return ERR_PTR(ret); | |
3313 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); | |
3314 | return NULL; | |
4d954c25 JA |
3315 | } |
3316 | ||
caa8fe6e | 3317 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 3318 | req->ctx->compat); |
caa8fe6e PB |
3319 | if (unlikely(ret < 0)) |
3320 | return ERR_PTR(ret); | |
3321 | return iovec; | |
2b188cc1 JA |
3322 | } |
3323 | ||
5e49c973 PB |
3324 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
3325 | struct iovec **iovec, struct io_rw_state *s, | |
3326 | unsigned int issue_flags) | |
3327 | { | |
caa8fe6e PB |
3328 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
3329 | if (unlikely(IS_ERR(*iovec))) | |
3330 | return PTR_ERR(*iovec); | |
5e49c973 | 3331 | |
5e49c973 | 3332 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 3333 | return 0; |
2b188cc1 JA |
3334 | } |
3335 | ||
0fef9483 JA |
3336 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3337 | { | |
5b09e37e | 3338 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3339 | } |
3340 | ||
31b51510 | 3341 | /* |
32960613 JA |
3342 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3343 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3344 | */ |
4017eb91 | 3345 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3346 | { |
4017eb91 JA |
3347 | struct kiocb *kiocb = &req->rw.kiocb; |
3348 | struct file *file = req->file; | |
32960613 JA |
3349 | ssize_t ret = 0; |
3350 | ||
3351 | /* | |
3352 | * Don't support polled IO through this interface, and we can't | |
3353 | * support non-blocking either. For the latter, this just causes | |
3354 | * the kiocb to be handled from an async context. | |
3355 | */ | |
3356 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3357 | return -EOPNOTSUPP; | |
35645ac3 PB |
3358 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
3359 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
3360 | return -EAGAIN; |
3361 | ||
3362 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3363 | struct iovec iovec; |
32960613 JA |
3364 | ssize_t nr; |
3365 | ||
311ae9e1 PB |
3366 | if (!iov_iter_is_bvec(iter)) { |
3367 | iovec = iov_iter_iovec(iter); | |
3368 | } else { | |
4017eb91 JA |
3369 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3370 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3371 | } |
3372 | ||
32960613 JA |
3373 | if (rw == READ) { |
3374 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3375 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3376 | } else { |
3377 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3378 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3379 | } |
3380 | ||
3381 | if (nr < 0) { | |
3382 | if (!ret) | |
3383 | ret = nr; | |
3384 | break; | |
3385 | } | |
16c8d2df JA |
3386 | if (!iov_iter_is_bvec(iter)) { |
3387 | iov_iter_advance(iter, nr); | |
3388 | } else { | |
3389 | req->rw.len -= nr; | |
3390 | req->rw.addr += nr; | |
3391 | } | |
32960613 JA |
3392 | ret += nr; |
3393 | if (nr != iovec.iov_len) | |
3394 | break; | |
32960613 JA |
3395 | } |
3396 | ||
3397 | return ret; | |
3398 | } | |
3399 | ||
ff6165b2 JA |
3400 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3401 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3402 | { |
e8c2bc1f | 3403 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3404 | |
538941e2 | 3405 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 3406 | rw->free_iovec = iovec; |
227c0c96 | 3407 | rw->bytes_done = 0; |
ff6165b2 | 3408 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3409 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3410 | return; |
b64e3444 | 3411 | if (!iovec) { |
ff6165b2 JA |
3412 | unsigned iov_off = 0; |
3413 | ||
538941e2 | 3414 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
3415 | if (iter->iov != fast_iov) { |
3416 | iov_off = iter->iov - fast_iov; | |
538941e2 | 3417 | rw->s.iter.iov += iov_off; |
ff6165b2 | 3418 | } |
538941e2 PB |
3419 | if (rw->s.fast_iov != fast_iov) |
3420 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3421 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3422 | } else { |
3423 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3424 | } |
3425 | } | |
3426 | ||
8d4af685 | 3427 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3428 | { |
e8c2bc1f JA |
3429 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3430 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
3431 | if (req->async_data) { |
3432 | req->flags |= REQ_F_ASYNC_DATA; | |
3433 | return false; | |
3434 | } | |
3435 | return true; | |
3d9932a8 XW |
3436 | } |
3437 | ||
ff6165b2 | 3438 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 3439 | struct io_rw_state *s, bool force) |
b7bb4f7d | 3440 | { |
26f0505a | 3441 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3442 | return 0; |
d886e185 | 3443 | if (!req_has_async_data(req)) { |
cd658695 JA |
3444 | struct io_async_rw *iorw; |
3445 | ||
6cb78689 | 3446 | if (io_alloc_async_data(req)) { |
6bf985dc | 3447 | kfree(iovec); |
5d204bcf | 3448 | return -ENOMEM; |
6bf985dc | 3449 | } |
b7bb4f7d | 3450 | |
c88598a9 | 3451 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
3452 | iorw = req->async_data; |
3453 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 3454 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 3455 | } |
b7bb4f7d | 3456 | return 0; |
f67676d1 JA |
3457 | } |
3458 | ||
73debe68 | 3459 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3460 | { |
e8c2bc1f | 3461 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 3462 | struct iovec *iov; |
847595de | 3463 | int ret; |
c3e330a4 | 3464 | |
51aac424 | 3465 | /* submission path, ->uring_lock should already be taken */ |
3b44b371 | 3466 | ret = io_import_iovec(rw, req, &iov, &iorw->s, 0); |
c3e330a4 PB |
3467 | if (unlikely(ret < 0)) |
3468 | return ret; | |
3469 | ||
ab0b196c PB |
3470 | iorw->bytes_done = 0; |
3471 | iorw->free_iovec = iov; | |
3472 | if (iov) | |
3473 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3474 | return 0; |
3475 | } | |
3476 | ||
73debe68 | 3477 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3478 | { |
3529d8c2 JA |
3479 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3480 | return -EBADF; | |
b9a6b8f9 | 3481 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3482 | } |
3483 | ||
c1dd91d1 | 3484 | /* |
ffdc8dab | 3485 | * This is our waitqueue callback handler, registered through __folio_lock_async() |
c1dd91d1 JA |
3486 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
3487 | * This gets called when the page is unlocked, and we generally expect that to | |
3488 | * happen when the page IO is completed and the page is now uptodate. This will | |
3489 | * queue a task_work based retry of the operation, attempting to copy the data | |
3490 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3491 | * do a thread based blocking retry of the operation. That's the unexpected | |
3492 | * slow path. | |
3493 | */ | |
bcf5a063 JA |
3494 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3495 | int sync, void *arg) | |
3496 | { | |
3497 | struct wait_page_queue *wpq; | |
3498 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3499 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3500 | |
3501 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3502 | ||
cdc8fcb4 LT |
3503 | if (!wake_page_match(wpq, key)) |
3504 | return 0; | |
3505 | ||
c8d317aa | 3506 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3507 | list_del_init(&wait->entry); |
921b9054 | 3508 | io_req_task_queue(req); |
bcf5a063 JA |
3509 | return 1; |
3510 | } | |
3511 | ||
c1dd91d1 JA |
3512 | /* |
3513 | * This controls whether a given IO request should be armed for async page | |
3514 | * based retry. If we return false here, the request is handed to the async | |
3515 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3516 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3517 | * will either succeed because the page is now uptodate and unlocked, or it | |
3518 | * will register a callback when the page is unlocked at IO completion. Through | |
3519 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3520 | * That retry will attempt the buffered read again. The retry will generally | |
3521 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3522 | * async worker threads for a blocking retry. | |
3523 | */ | |
227c0c96 | 3524 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3525 | { |
e8c2bc1f JA |
3526 | struct io_async_rw *rw = req->async_data; |
3527 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3528 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3529 | |
bcf5a063 JA |
3530 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3531 | if (req->flags & REQ_F_NOWAIT) | |
3532 | return false; | |
f67676d1 | 3533 | |
227c0c96 | 3534 | /* Only for buffered IO */ |
3b2a4439 | 3535 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3536 | return false; |
3b2a4439 | 3537 | |
bcf5a063 JA |
3538 | /* |
3539 | * just use poll if we can, and don't attempt if the fs doesn't | |
3540 | * support callback based unlocks | |
3541 | */ | |
3542 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3543 | return false; | |
f67676d1 | 3544 | |
3b2a4439 JA |
3545 | wait->wait.func = io_async_buf_func; |
3546 | wait->wait.private = req; | |
3547 | wait->wait.flags = 0; | |
3548 | INIT_LIST_HEAD(&wait->wait.entry); | |
3549 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3550 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3551 | kiocb->ki_waitq = wait; |
3b2a4439 | 3552 | return true; |
bcf5a063 JA |
3553 | } |
3554 | ||
aeab9506 | 3555 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 3556 | { |
607b6fb8 | 3557 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 3558 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 3559 | else if (req->file->f_op->read) |
4017eb91 | 3560 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3561 | else |
3562 | return -EINVAL; | |
f67676d1 JA |
3563 | } |
3564 | ||
7db30437 ML |
3565 | static bool need_read_all(struct io_kiocb *req) |
3566 | { | |
3567 | return req->flags & REQ_F_ISREG || | |
3568 | S_ISBLK(file_inode(req->file)->i_mode); | |
3569 | } | |
3570 | ||
889fca73 | 3571 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3572 | { |
607b6fb8 | 3573 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3574 | struct iovec *iovec; |
9adbd45d | 3575 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3576 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 3577 | struct io_async_rw *rw; |
cd658695 | 3578 | ssize_t ret, ret2; |
ff6165b2 | 3579 | |
607b6fb8 PB |
3580 | if (!req_has_async_data(req)) { |
3581 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3582 | if (unlikely(ret < 0)) | |
3583 | return ret; | |
3584 | } else { | |
d886e185 | 3585 | rw = req->async_data; |
c88598a9 | 3586 | s = &rw->s; |
cd658695 JA |
3587 | /* |
3588 | * We come here from an earlier attempt, restore our state to | |
3589 | * match in case it doesn't. It's cheap enough that we don't | |
3590 | * need to make this conditional. | |
3591 | */ | |
c88598a9 | 3592 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 3593 | iovec = NULL; |
2846c481 | 3594 | } |
c88598a9 | 3595 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3596 | |
607b6fb8 PB |
3597 | if (force_nonblock) { |
3598 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3599 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
3600 | ret = io_setup_async_rw(req, iovec, s, true); |
3601 | return ret ?: -EAGAIN; | |
3602 | } | |
a88fc400 | 3603 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
3604 | } else { |
3605 | /* Ensure we clear previously set non-block flag */ | |
3606 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 3607 | } |
9e645e11 | 3608 | |
cd658695 | 3609 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); |
5ea5dd45 PB |
3610 | if (unlikely(ret)) { |
3611 | kfree(iovec); | |
3612 | return ret; | |
3613 | } | |
2b188cc1 | 3614 | |
c88598a9 | 3615 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 3616 | |
230d50d4 | 3617 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3618 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3619 | /* IOPOLL retry should happen for io-wq threads */ |
3620 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3621 | goto done; |
75c668cd PB |
3622 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3623 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3624 | goto done; |
f38c7e3a | 3625 | ret = 0; |
230d50d4 JA |
3626 | } else if (ret == -EIOCBQUEUED) { |
3627 | goto out_free; | |
f80a50a6 | 3628 | } else if (ret == req->result || ret <= 0 || !force_nonblock || |
7db30437 | 3629 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3630 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3631 | goto done; |
227c0c96 JA |
3632 | } |
3633 | ||
cd658695 JA |
3634 | /* |
3635 | * Don't depend on the iter state matching what was consumed, or being | |
3636 | * untouched in case of error. Restore it and we'll advance it | |
3637 | * manually if we need to. | |
3638 | */ | |
c88598a9 | 3639 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3640 | |
c88598a9 | 3641 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
3642 | if (ret2) |
3643 | return ret2; | |
3644 | ||
fe1cdd55 | 3645 | iovec = NULL; |
e8c2bc1f | 3646 | rw = req->async_data; |
c88598a9 | 3647 | s = &rw->s; |
cd658695 JA |
3648 | /* |
3649 | * Now use our persistent iterator and state, if we aren't already. | |
3650 | * We've restored and mapped the iter to match. | |
3651 | */ | |
227c0c96 | 3652 | |
b23df91b | 3653 | do { |
cd658695 JA |
3654 | /* |
3655 | * We end up here because of a partial read, either from | |
3656 | * above or inside this loop. Advance the iter by the bytes | |
3657 | * that were consumed. | |
3658 | */ | |
c88598a9 PB |
3659 | iov_iter_advance(&s->iter, ret); |
3660 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 3661 | break; |
b23df91b | 3662 | rw->bytes_done += ret; |
c88598a9 | 3663 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 3664 | |
b23df91b PB |
3665 | /* if we can retry, do so with the callbacks armed */ |
3666 | if (!io_rw_should_retry(req)) { | |
3667 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3668 | return -EAGAIN; | |
3669 | } | |
3670 | ||
3671 | /* | |
3672 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3673 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3674 | * desired page gets unlocked. We can also get a partial read | |
3675 | * here, and if we do, then just retry at the new offset. | |
3676 | */ | |
c88598a9 | 3677 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
3678 | if (ret == -EIOCBQUEUED) |
3679 | return 0; | |
227c0c96 | 3680 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3681 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 3682 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3683 | } while (ret > 0); |
227c0c96 | 3684 | done: |
2ea537ca | 3685 | kiocb_done(req, ret, issue_flags); |
fe1cdd55 PB |
3686 | out_free: |
3687 | /* it's faster to check here then delegate to kfree */ | |
3688 | if (iovec) | |
3689 | kfree(iovec); | |
5ea5dd45 | 3690 | return 0; |
2b188cc1 JA |
3691 | } |
3692 | ||
73debe68 | 3693 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3694 | { |
3529d8c2 JA |
3695 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3696 | return -EBADF; | |
3884b83d | 3697 | req->rw.kiocb.ki_hint = ki_hint_validate(file_write_hint(req->file)); |
b9a6b8f9 | 3698 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3699 | } |
3700 | ||
889fca73 | 3701 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3702 | { |
607b6fb8 | 3703 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3704 | struct iovec *iovec; |
9adbd45d | 3705 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3706 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3707 | ssize_t ret, ret2; |
2b188cc1 | 3708 | |
607b6fb8 | 3709 | if (!req_has_async_data(req)) { |
5e49c973 PB |
3710 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
3711 | if (unlikely(ret < 0)) | |
2846c481 | 3712 | return ret; |
607b6fb8 PB |
3713 | } else { |
3714 | struct io_async_rw *rw = req->async_data; | |
3715 | ||
3716 | s = &rw->s; | |
3717 | iov_iter_restore(&s->iter, &s->iter_state); | |
2846c481 | 3718 | iovec = NULL; |
2846c481 | 3719 | } |
c88598a9 | 3720 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3721 | |
607b6fb8 PB |
3722 | if (force_nonblock) { |
3723 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3724 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 3725 | goto copy_iov; |
fd6c2e4c | 3726 | |
607b6fb8 PB |
3727 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3728 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3729 | (req->flags & REQ_F_ISREG)) | |
3730 | goto copy_iov; | |
31b51510 | 3731 | |
607b6fb8 PB |
3732 | kiocb->ki_flags |= IOCB_NOWAIT; |
3733 | } else { | |
3734 | /* Ensure we clear previously set non-block flag */ | |
3735 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
3736 | } | |
31b51510 | 3737 | |
cd658695 | 3738 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); |
fa15bafb PB |
3739 | if (unlikely(ret)) |
3740 | goto out_free; | |
4ed734b0 | 3741 | |
fa15bafb PB |
3742 | /* |
3743 | * Open-code file_start_write here to grab freeze protection, | |
3744 | * which will be released by another thread in | |
3745 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3746 | * released so that it doesn't complain about the held lock when | |
3747 | * we return to userspace. | |
3748 | */ | |
3749 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3750 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3751 | __sb_writers_release(file_inode(req->file)->i_sb, |
3752 | SB_FREEZE_WRITE); | |
3753 | } | |
3754 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3755 | |
35645ac3 | 3756 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 3757 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 3758 | else if (req->file->f_op->write) |
c88598a9 | 3759 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
3760 | else |
3761 | ret2 = -EINVAL; | |
4ed734b0 | 3762 | |
6ad7f233 PB |
3763 | if (req->flags & REQ_F_REISSUE) { |
3764 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3765 | ret2 = -EAGAIN; |
6ad7f233 | 3766 | } |
230d50d4 | 3767 | |
fa15bafb PB |
3768 | /* |
3769 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3770 | * retry them without IOCB_NOWAIT. | |
3771 | */ | |
3772 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3773 | ret2 = -EAGAIN; | |
75c668cd PB |
3774 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3775 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3776 | goto done; |
fa15bafb | 3777 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 3778 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 3779 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 3780 | goto copy_iov; |
355afaeb | 3781 | done: |
2ea537ca | 3782 | kiocb_done(req, ret2, issue_flags); |
fa15bafb | 3783 | } else { |
f67676d1 | 3784 | copy_iov: |
c88598a9 PB |
3785 | iov_iter_restore(&s->iter, &s->iter_state); |
3786 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 3787 | return ret ?: -EAGAIN; |
2b188cc1 | 3788 | } |
31b51510 | 3789 | out_free: |
f261c168 | 3790 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3791 | if (iovec) |
6f2cc166 | 3792 | kfree(iovec); |
2b188cc1 JA |
3793 | return ret; |
3794 | } | |
3795 | ||
80a261fd JA |
3796 | static int io_renameat_prep(struct io_kiocb *req, |
3797 | const struct io_uring_sqe *sqe) | |
3798 | { | |
3799 | struct io_rename *ren = &req->rename; | |
3800 | const char __user *oldf, *newf; | |
3801 | ||
ed7eb259 JA |
3802 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3803 | return -EINVAL; | |
26578cda | 3804 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3805 | return -EINVAL; |
80a261fd JA |
3806 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3807 | return -EBADF; | |
3808 | ||
3809 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3810 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3811 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3812 | ren->new_dfd = READ_ONCE(sqe->len); | |
3813 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3814 | ||
3815 | ren->oldpath = getname(oldf); | |
3816 | if (IS_ERR(ren->oldpath)) | |
3817 | return PTR_ERR(ren->oldpath); | |
3818 | ||
3819 | ren->newpath = getname(newf); | |
3820 | if (IS_ERR(ren->newpath)) { | |
3821 | putname(ren->oldpath); | |
3822 | return PTR_ERR(ren->newpath); | |
3823 | } | |
3824 | ||
3825 | req->flags |= REQ_F_NEED_CLEANUP; | |
3826 | return 0; | |
3827 | } | |
3828 | ||
45d189c6 | 3829 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3830 | { |
3831 | struct io_rename *ren = &req->rename; | |
3832 | int ret; | |
3833 | ||
45d189c6 | 3834 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3835 | return -EAGAIN; |
3836 | ||
3837 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3838 | ren->newpath, ren->flags); | |
3839 | ||
3840 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3841 | if (ret < 0) | |
93d2bcd2 | 3842 | req_set_fail(req); |
80a261fd JA |
3843 | io_req_complete(req, ret); |
3844 | return 0; | |
3845 | } | |
3846 | ||
14a1143b JA |
3847 | static int io_unlinkat_prep(struct io_kiocb *req, |
3848 | const struct io_uring_sqe *sqe) | |
3849 | { | |
3850 | struct io_unlink *un = &req->unlink; | |
3851 | const char __user *fname; | |
3852 | ||
22634bc5 JA |
3853 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3854 | return -EINVAL; | |
26578cda PB |
3855 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3856 | sqe->splice_fd_in) | |
22634bc5 | 3857 | return -EINVAL; |
14a1143b JA |
3858 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3859 | return -EBADF; | |
3860 | ||
3861 | un->dfd = READ_ONCE(sqe->fd); | |
3862 | ||
3863 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3864 | if (un->flags & ~AT_REMOVEDIR) | |
3865 | return -EINVAL; | |
3866 | ||
3867 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3868 | un->filename = getname(fname); | |
3869 | if (IS_ERR(un->filename)) | |
3870 | return PTR_ERR(un->filename); | |
3871 | ||
3872 | req->flags |= REQ_F_NEED_CLEANUP; | |
3873 | return 0; | |
3874 | } | |
3875 | ||
45d189c6 | 3876 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3877 | { |
3878 | struct io_unlink *un = &req->unlink; | |
3879 | int ret; | |
3880 | ||
45d189c6 | 3881 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3882 | return -EAGAIN; |
3883 | ||
3884 | if (un->flags & AT_REMOVEDIR) | |
3885 | ret = do_rmdir(un->dfd, un->filename); | |
3886 | else | |
3887 | ret = do_unlinkat(un->dfd, un->filename); | |
3888 | ||
3889 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3890 | if (ret < 0) | |
93d2bcd2 | 3891 | req_set_fail(req); |
14a1143b JA |
3892 | io_req_complete(req, ret); |
3893 | return 0; | |
3894 | } | |
3895 | ||
e34a02dc DK |
3896 | static int io_mkdirat_prep(struct io_kiocb *req, |
3897 | const struct io_uring_sqe *sqe) | |
3898 | { | |
3899 | struct io_mkdir *mkd = &req->mkdir; | |
3900 | const char __user *fname; | |
3901 | ||
3902 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3903 | return -EINVAL; | |
3904 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
3905 | sqe->splice_fd_in) | |
3906 | return -EINVAL; | |
3907 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3908 | return -EBADF; | |
3909 | ||
3910 | mkd->dfd = READ_ONCE(sqe->fd); | |
3911 | mkd->mode = READ_ONCE(sqe->len); | |
3912 | ||
3913 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3914 | mkd->filename = getname(fname); | |
3915 | if (IS_ERR(mkd->filename)) | |
3916 | return PTR_ERR(mkd->filename); | |
3917 | ||
3918 | req->flags |= REQ_F_NEED_CLEANUP; | |
3919 | return 0; | |
3920 | } | |
3921 | ||
04f34081 | 3922 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
3923 | { |
3924 | struct io_mkdir *mkd = &req->mkdir; | |
3925 | int ret; | |
3926 | ||
3927 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3928 | return -EAGAIN; | |
3929 | ||
3930 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
3931 | ||
3932 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3933 | if (ret < 0) | |
3934 | req_set_fail(req); | |
3935 | io_req_complete(req, ret); | |
3936 | return 0; | |
3937 | } | |
3938 | ||
7a8721f8 DK |
3939 | static int io_symlinkat_prep(struct io_kiocb *req, |
3940 | const struct io_uring_sqe *sqe) | |
3941 | { | |
3942 | struct io_symlink *sl = &req->symlink; | |
3943 | const char __user *oldpath, *newpath; | |
3944 | ||
3945 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3946 | return -EINVAL; | |
3947 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
3948 | sqe->splice_fd_in) | |
3949 | return -EINVAL; | |
3950 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3951 | return -EBADF; | |
3952 | ||
3953 | sl->new_dfd = READ_ONCE(sqe->fd); | |
3954 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3955 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3956 | ||
3957 | sl->oldpath = getname(oldpath); | |
3958 | if (IS_ERR(sl->oldpath)) | |
3959 | return PTR_ERR(sl->oldpath); | |
3960 | ||
3961 | sl->newpath = getname(newpath); | |
3962 | if (IS_ERR(sl->newpath)) { | |
3963 | putname(sl->oldpath); | |
3964 | return PTR_ERR(sl->newpath); | |
3965 | } | |
3966 | ||
3967 | req->flags |= REQ_F_NEED_CLEANUP; | |
3968 | return 0; | |
3969 | } | |
3970 | ||
04f34081 | 3971 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
3972 | { |
3973 | struct io_symlink *sl = &req->symlink; | |
3974 | int ret; | |
3975 | ||
3976 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3977 | return -EAGAIN; | |
3978 | ||
3979 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
3980 | ||
3981 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3982 | if (ret < 0) | |
3983 | req_set_fail(req); | |
3984 | io_req_complete(req, ret); | |
3985 | return 0; | |
3986 | } | |
3987 | ||
cf30da90 DK |
3988 | static int io_linkat_prep(struct io_kiocb *req, |
3989 | const struct io_uring_sqe *sqe) | |
3990 | { | |
3991 | struct io_hardlink *lnk = &req->hardlink; | |
3992 | const char __user *oldf, *newf; | |
3993 | ||
3994 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3995 | return -EINVAL; | |
3996 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
3997 | return -EINVAL; | |
3998 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3999 | return -EBADF; | |
4000 | ||
4001 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
4002 | lnk->new_dfd = READ_ONCE(sqe->len); | |
4003 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4004 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4005 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
4006 | ||
4007 | lnk->oldpath = getname(oldf); | |
4008 | if (IS_ERR(lnk->oldpath)) | |
4009 | return PTR_ERR(lnk->oldpath); | |
4010 | ||
4011 | lnk->newpath = getname(newf); | |
4012 | if (IS_ERR(lnk->newpath)) { | |
4013 | putname(lnk->oldpath); | |
4014 | return PTR_ERR(lnk->newpath); | |
4015 | } | |
4016 | ||
4017 | req->flags |= REQ_F_NEED_CLEANUP; | |
4018 | return 0; | |
4019 | } | |
4020 | ||
04f34081 | 4021 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
4022 | { |
4023 | struct io_hardlink *lnk = &req->hardlink; | |
4024 | int ret; | |
4025 | ||
4026 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4027 | return -EAGAIN; | |
4028 | ||
4029 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
4030 | lnk->newpath, lnk->flags); | |
4031 | ||
4032 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4033 | if (ret < 0) | |
4034 | req_set_fail(req); | |
4035 | io_req_complete(req, ret); | |
4036 | return 0; | |
4037 | } | |
4038 | ||
36f4fa68 JA |
4039 | static int io_shutdown_prep(struct io_kiocb *req, |
4040 | const struct io_uring_sqe *sqe) | |
4041 | { | |
4042 | #if defined(CONFIG_NET) | |
4043 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4044 | return -EINVAL; | |
26578cda PB |
4045 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
4046 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
4047 | return -EINVAL; |
4048 | ||
4049 | req->shutdown.how = READ_ONCE(sqe->len); | |
4050 | return 0; | |
4051 | #else | |
4052 | return -EOPNOTSUPP; | |
4053 | #endif | |
4054 | } | |
4055 | ||
45d189c6 | 4056 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
4057 | { |
4058 | #if defined(CONFIG_NET) | |
4059 | struct socket *sock; | |
4060 | int ret; | |
4061 | ||
45d189c6 | 4062 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
4063 | return -EAGAIN; |
4064 | ||
48aba79b | 4065 | sock = sock_from_file(req->file); |
36f4fa68 | 4066 | if (unlikely(!sock)) |
48aba79b | 4067 | return -ENOTSOCK; |
36f4fa68 JA |
4068 | |
4069 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 4070 | if (ret < 0) |
93d2bcd2 | 4071 | req_set_fail(req); |
36f4fa68 JA |
4072 | io_req_complete(req, ret); |
4073 | return 0; | |
4074 | #else | |
4075 | return -EOPNOTSUPP; | |
4076 | #endif | |
4077 | } | |
4078 | ||
f2a8d5c7 PB |
4079 | static int __io_splice_prep(struct io_kiocb *req, |
4080 | const struct io_uring_sqe *sqe) | |
7d67af2c | 4081 | { |
fe7e3257 | 4082 | struct io_splice *sp = &req->splice; |
7d67af2c | 4083 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 4084 | |
3232dd02 PB |
4085 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4086 | return -EINVAL; | |
7d67af2c PB |
4087 | |
4088 | sp->file_in = NULL; | |
7d67af2c PB |
4089 | sp->len = READ_ONCE(sqe->len); |
4090 | sp->flags = READ_ONCE(sqe->splice_flags); | |
4091 | ||
4092 | if (unlikely(sp->flags & ~valid_flags)) | |
4093 | return -EINVAL; | |
4094 | ||
62906e89 | 4095 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
4096 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
4097 | if (!sp->file_in) | |
4098 | return -EBADF; | |
7d67af2c | 4099 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
4100 | return 0; |
4101 | } | |
4102 | ||
f2a8d5c7 PB |
4103 | static int io_tee_prep(struct io_kiocb *req, |
4104 | const struct io_uring_sqe *sqe) | |
4105 | { | |
4106 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
4107 | return -EINVAL; | |
4108 | return __io_splice_prep(req, sqe); | |
4109 | } | |
4110 | ||
45d189c6 | 4111 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
4112 | { |
4113 | struct io_splice *sp = &req->splice; | |
4114 | struct file *in = sp->file_in; | |
4115 | struct file *out = sp->file_out; | |
4116 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4117 | long ret = 0; | |
4118 | ||
45d189c6 | 4119 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
4120 | return -EAGAIN; |
4121 | if (sp->len) | |
4122 | ret = do_tee(in, out, sp->len, flags); | |
4123 | ||
e1d767f0 PB |
4124 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4125 | io_put_file(in); | |
f2a8d5c7 PB |
4126 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4127 | ||
f2a8d5c7 | 4128 | if (ret != sp->len) |
93d2bcd2 | 4129 | req_set_fail(req); |
e1e16097 | 4130 | io_req_complete(req, ret); |
f2a8d5c7 PB |
4131 | return 0; |
4132 | } | |
4133 | ||
4134 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4135 | { | |
fe7e3257 | 4136 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
4137 | |
4138 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4139 | sp->off_out = READ_ONCE(sqe->off); | |
4140 | return __io_splice_prep(req, sqe); | |
4141 | } | |
4142 | ||
45d189c6 | 4143 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4144 | { |
4145 | struct io_splice *sp = &req->splice; | |
4146 | struct file *in = sp->file_in; | |
4147 | struct file *out = sp->file_out; | |
4148 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4149 | loff_t *poff_in, *poff_out; | |
c9687426 | 4150 | long ret = 0; |
7d67af2c | 4151 | |
45d189c6 | 4152 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4153 | return -EAGAIN; |
7d67af2c PB |
4154 | |
4155 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4156 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4157 | |
948a7749 | 4158 | if (sp->len) |
c9687426 | 4159 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4160 | |
e1d767f0 PB |
4161 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4162 | io_put_file(in); | |
7d67af2c PB |
4163 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4164 | ||
7d67af2c | 4165 | if (ret != sp->len) |
93d2bcd2 | 4166 | req_set_fail(req); |
e1e16097 | 4167 | io_req_complete(req, ret); |
7d67af2c PB |
4168 | return 0; |
4169 | } | |
4170 | ||
2b188cc1 JA |
4171 | /* |
4172 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4173 | */ | |
889fca73 | 4174 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4175 | { |
4176 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4177 | |
def596e9 JA |
4178 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4179 | return -EINVAL; | |
4180 | ||
889fca73 | 4181 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4182 | return 0; |
4183 | } | |
4184 | ||
1155c76a | 4185 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4186 | { |
6b06314c | 4187 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4188 | |
09bb8394 JA |
4189 | if (!req->file) |
4190 | return -EBADF; | |
c992fe29 | 4191 | |
6b06314c | 4192 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4193 | return -EINVAL; |
26578cda PB |
4194 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4195 | sqe->splice_fd_in)) | |
c992fe29 CH |
4196 | return -EINVAL; |
4197 | ||
8ed8d3c3 JA |
4198 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4199 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4200 | return -EINVAL; | |
4201 | ||
4202 | req->sync.off = READ_ONCE(sqe->off); | |
4203 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4204 | return 0; |
4205 | } | |
4206 | ||
45d189c6 | 4207 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4208 | { |
8ed8d3c3 | 4209 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4210 | int ret; |
4211 | ||
ac45abc0 | 4212 | /* fsync always requires a blocking context */ |
45d189c6 | 4213 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4214 | return -EAGAIN; |
4215 | ||
9adbd45d | 4216 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4217 | end > 0 ? end : LLONG_MAX, |
4218 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4219 | if (ret < 0) | |
93d2bcd2 | 4220 | req_set_fail(req); |
e1e16097 | 4221 | io_req_complete(req, ret); |
c992fe29 CH |
4222 | return 0; |
4223 | } | |
4224 | ||
d63d1b5e JA |
4225 | static int io_fallocate_prep(struct io_kiocb *req, |
4226 | const struct io_uring_sqe *sqe) | |
4227 | { | |
26578cda PB |
4228 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4229 | sqe->splice_fd_in) | |
d63d1b5e | 4230 | return -EINVAL; |
3232dd02 PB |
4231 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4232 | return -EINVAL; | |
d63d1b5e JA |
4233 | |
4234 | req->sync.off = READ_ONCE(sqe->off); | |
4235 | req->sync.len = READ_ONCE(sqe->addr); | |
4236 | req->sync.mode = READ_ONCE(sqe->len); | |
4237 | return 0; | |
4238 | } | |
4239 | ||
45d189c6 | 4240 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4241 | { |
ac45abc0 PB |
4242 | int ret; |
4243 | ||
d63d1b5e | 4244 | /* fallocate always requiring blocking context */ |
45d189c6 | 4245 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4246 | return -EAGAIN; |
ac45abc0 PB |
4247 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4248 | req->sync.len); | |
ac45abc0 | 4249 | if (ret < 0) |
93d2bcd2 | 4250 | req_set_fail(req); |
e1e16097 | 4251 | io_req_complete(req, ret); |
5d17b4a4 JA |
4252 | return 0; |
4253 | } | |
4254 | ||
ec65fea5 | 4255 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4256 | { |
f8748881 | 4257 | const char __user *fname; |
15b71abe | 4258 | int ret; |
b7bb4f7d | 4259 | |
d3fddf6d PB |
4260 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4261 | return -EINVAL; | |
b9445598 | 4262 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4263 | return -EINVAL; |
ec65fea5 | 4264 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4265 | return -EBADF; |
03b1230c | 4266 | |
ec65fea5 PB |
4267 | /* open.how should be already initialised */ |
4268 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4269 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4270 | |
25e72d10 PB |
4271 | req->open.dfd = READ_ONCE(sqe->fd); |
4272 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4273 | req->open.filename = getname(fname); |
15b71abe JA |
4274 | if (IS_ERR(req->open.filename)) { |
4275 | ret = PTR_ERR(req->open.filename); | |
4276 | req->open.filename = NULL; | |
4277 | return ret; | |
4278 | } | |
b9445598 PB |
4279 | |
4280 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4281 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4282 | return -EINVAL; | |
4283 | ||
4022e7af | 4284 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4285 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4286 | return 0; |
03b1230c JA |
4287 | } |
4288 | ||
ec65fea5 PB |
4289 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4290 | { | |
d3fddf6d PB |
4291 | u64 mode = READ_ONCE(sqe->len); |
4292 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4293 | |
ec65fea5 PB |
4294 | req->open.how = build_open_how(flags, mode); |
4295 | return __io_openat_prep(req, sqe); | |
4296 | } | |
4297 | ||
cebdb986 | 4298 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4299 | { |
cebdb986 | 4300 | struct open_how __user *how; |
cebdb986 | 4301 | size_t len; |
0fa03c62 JA |
4302 | int ret; |
4303 | ||
cebdb986 JA |
4304 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4305 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4306 | if (len < OPEN_HOW_SIZE_VER0) |
4307 | return -EINVAL; | |
3529d8c2 | 4308 | |
cebdb986 JA |
4309 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4310 | len); | |
4311 | if (ret) | |
4312 | return ret; | |
3529d8c2 | 4313 | |
ec65fea5 | 4314 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4315 | } |
4316 | ||
45d189c6 | 4317 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4318 | { |
4319 | struct open_flags op; | |
15b71abe | 4320 | struct file *file; |
b9445598 PB |
4321 | bool resolve_nonblock, nonblock_set; |
4322 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4323 | int ret; |
4324 | ||
cebdb986 | 4325 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4326 | if (ret) |
4327 | goto err; | |
3a81fd02 JA |
4328 | nonblock_set = op.open_flag & O_NONBLOCK; |
4329 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4330 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4331 | /* |
4332 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4333 | * it'll always -EAGAIN | |
4334 | */ | |
4335 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4336 | return -EAGAIN; | |
4337 | op.lookup_flags |= LOOKUP_CACHED; | |
4338 | op.open_flag |= O_NONBLOCK; | |
4339 | } | |
15b71abe | 4340 | |
b9445598 PB |
4341 | if (!fixed) { |
4342 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4343 | if (ret < 0) | |
4344 | goto err; | |
4345 | } | |
15b71abe JA |
4346 | |
4347 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4348 | if (IS_ERR(file)) { |
944d1444 | 4349 | /* |
12dcb58a PB |
4350 | * We could hang on to this 'fd' on retrying, but seems like |
4351 | * marginal gain for something that is now known to be a slower | |
4352 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4353 | */ |
b9445598 PB |
4354 | if (!fixed) |
4355 | put_unused_fd(ret); | |
3a81fd02 | 4356 | |
15b71abe | 4357 | ret = PTR_ERR(file); |
12dcb58a PB |
4358 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4359 | if (ret == -EAGAIN && | |
4360 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4361 | return -EAGAIN; | |
4362 | goto err; | |
15b71abe | 4363 | } |
12dcb58a PB |
4364 | |
4365 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4366 | file->f_flags &= ~O_NONBLOCK; | |
4367 | fsnotify_open(file); | |
b9445598 PB |
4368 | |
4369 | if (!fixed) | |
4370 | fd_install(ret, file); | |
4371 | else | |
4372 | ret = io_install_fixed_file(req, file, issue_flags, | |
4373 | req->open.file_slot - 1); | |
15b71abe JA |
4374 | err: |
4375 | putname(req->open.filename); | |
8fef80bf | 4376 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4377 | if (ret < 0) |
93d2bcd2 | 4378 | req_set_fail(req); |
0bdf3398 | 4379 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4380 | return 0; |
4381 | } | |
4382 | ||
45d189c6 | 4383 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4384 | { |
e45cff58 | 4385 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4386 | } |
4387 | ||
067524e9 JA |
4388 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4389 | const struct io_uring_sqe *sqe) | |
4390 | { | |
4391 | struct io_provide_buf *p = &req->pbuf; | |
4392 | u64 tmp; | |
4393 | ||
26578cda PB |
4394 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4395 | sqe->splice_fd_in) | |
067524e9 JA |
4396 | return -EINVAL; |
4397 | ||
4398 | tmp = READ_ONCE(sqe->fd); | |
4399 | if (!tmp || tmp > USHRT_MAX) | |
4400 | return -EINVAL; | |
4401 | ||
4402 | memset(p, 0, sizeof(*p)); | |
4403 | p->nbufs = tmp; | |
4404 | p->bgid = READ_ONCE(sqe->buf_group); | |
4405 | return 0; | |
4406 | } | |
4407 | ||
4408 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4409 | int bgid, unsigned nbufs) | |
4410 | { | |
4411 | unsigned i = 0; | |
4412 | ||
4413 | /* shouldn't happen */ | |
4414 | if (!nbufs) | |
4415 | return 0; | |
4416 | ||
4417 | /* the head kbuf is the list itself */ | |
4418 | while (!list_empty(&buf->list)) { | |
4419 | struct io_buffer *nxt; | |
4420 | ||
4421 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4422 | list_del(&nxt->list); | |
4423 | kfree(nxt); | |
4424 | if (++i == nbufs) | |
4425 | return i; | |
4426 | } | |
4427 | i++; | |
4428 | kfree(buf); | |
9e15c3a0 | 4429 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4430 | |
4431 | return i; | |
4432 | } | |
4433 | ||
889fca73 | 4434 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4435 | { |
4436 | struct io_provide_buf *p = &req->pbuf; | |
4437 | struct io_ring_ctx *ctx = req->ctx; | |
4438 | struct io_buffer *head; | |
4439 | int ret = 0; | |
3b44b371 | 4440 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
067524e9 | 4441 | |
3b44b371 | 4442 | io_ring_submit_lock(ctx, needs_lock); |
067524e9 JA |
4443 | |
4444 | lockdep_assert_held(&ctx->uring_lock); | |
4445 | ||
4446 | ret = -ENOENT; | |
9e15c3a0 | 4447 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4448 | if (head) |
4449 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4450 | if (ret < 0) |
93d2bcd2 | 4451 | req_set_fail(req); |
067524e9 | 4452 | |
9fb8cb49 PB |
4453 | /* complete before unlock, IOPOLL may need the lock */ |
4454 | __io_req_complete(req, issue_flags, ret, 0); | |
3b44b371 | 4455 | io_ring_submit_unlock(ctx, needs_lock); |
067524e9 JA |
4456 | return 0; |
4457 | } | |
4458 | ||
ddf0322d JA |
4459 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4460 | const struct io_uring_sqe *sqe) | |
4461 | { | |
38134ada | 4462 | unsigned long size, tmp_check; |
ddf0322d JA |
4463 | struct io_provide_buf *p = &req->pbuf; |
4464 | u64 tmp; | |
4465 | ||
26578cda | 4466 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4467 | return -EINVAL; |
4468 | ||
4469 | tmp = READ_ONCE(sqe->fd); | |
4470 | if (!tmp || tmp > USHRT_MAX) | |
4471 | return -E2BIG; | |
4472 | p->nbufs = tmp; | |
4473 | p->addr = READ_ONCE(sqe->addr); | |
4474 | p->len = READ_ONCE(sqe->len); | |
4475 | ||
38134ada PB |
4476 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4477 | &size)) | |
4478 | return -EOVERFLOW; | |
4479 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4480 | return -EOVERFLOW; | |
4481 | ||
d81269fe PB |
4482 | size = (unsigned long)p->len * p->nbufs; |
4483 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4484 | return -EFAULT; |
4485 | ||
4486 | p->bgid = READ_ONCE(sqe->buf_group); | |
4487 | tmp = READ_ONCE(sqe->off); | |
4488 | if (tmp > USHRT_MAX) | |
4489 | return -E2BIG; | |
4490 | p->bid = tmp; | |
4491 | return 0; | |
4492 | } | |
4493 | ||
4494 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4495 | { | |
4496 | struct io_buffer *buf; | |
4497 | u64 addr = pbuf->addr; | |
4498 | int i, bid = pbuf->bid; | |
4499 | ||
4500 | for (i = 0; i < pbuf->nbufs; i++) { | |
9990da93 | 4501 | buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); |
ddf0322d JA |
4502 | if (!buf) |
4503 | break; | |
4504 | ||
4505 | buf->addr = addr; | |
d1f82808 | 4506 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4507 | buf->bid = bid; |
4508 | addr += pbuf->len; | |
4509 | bid++; | |
4510 | if (!*head) { | |
4511 | INIT_LIST_HEAD(&buf->list); | |
4512 | *head = buf; | |
4513 | } else { | |
4514 | list_add_tail(&buf->list, &(*head)->list); | |
4515 | } | |
4516 | } | |
4517 | ||
4518 | return i ? i : -ENOMEM; | |
4519 | } | |
4520 | ||
889fca73 | 4521 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4522 | { |
4523 | struct io_provide_buf *p = &req->pbuf; | |
4524 | struct io_ring_ctx *ctx = req->ctx; | |
4525 | struct io_buffer *head, *list; | |
4526 | int ret = 0; | |
3b44b371 | 4527 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
ddf0322d | 4528 | |
3b44b371 | 4529 | io_ring_submit_lock(ctx, needs_lock); |
ddf0322d JA |
4530 | |
4531 | lockdep_assert_held(&ctx->uring_lock); | |
4532 | ||
9e15c3a0 | 4533 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4534 | |
4535 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4536 | if (ret >= 0 && !list) { |
4537 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4538 | if (ret < 0) | |
067524e9 | 4539 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4540 | } |
ddf0322d | 4541 | if (ret < 0) |
93d2bcd2 | 4542 | req_set_fail(req); |
9fb8cb49 PB |
4543 | /* complete before unlock, IOPOLL may need the lock */ |
4544 | __io_req_complete(req, issue_flags, ret, 0); | |
3b44b371 | 4545 | io_ring_submit_unlock(ctx, needs_lock); |
ddf0322d | 4546 | return 0; |
cebdb986 JA |
4547 | } |
4548 | ||
3e4827b0 JA |
4549 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4550 | const struct io_uring_sqe *sqe) | |
4551 | { | |
4552 | #if defined(CONFIG_EPOLL) | |
26578cda | 4553 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4554 | return -EINVAL; |
2d74d042 | 4555 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4556 | return -EINVAL; |
3e4827b0 JA |
4557 | |
4558 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4559 | req->epoll.op = READ_ONCE(sqe->len); | |
4560 | req->epoll.fd = READ_ONCE(sqe->off); | |
4561 | ||
4562 | if (ep_op_has_event(req->epoll.op)) { | |
4563 | struct epoll_event __user *ev; | |
4564 | ||
4565 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4566 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4567 | return -EFAULT; | |
4568 | } | |
4569 | ||
4570 | return 0; | |
4571 | #else | |
4572 | return -EOPNOTSUPP; | |
4573 | #endif | |
4574 | } | |
4575 | ||
889fca73 | 4576 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4577 | { |
4578 | #if defined(CONFIG_EPOLL) | |
4579 | struct io_epoll *ie = &req->epoll; | |
4580 | int ret; | |
45d189c6 | 4581 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4582 | |
4583 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4584 | if (force_nonblock && ret == -EAGAIN) | |
4585 | return -EAGAIN; | |
4586 | ||
4587 | if (ret < 0) | |
93d2bcd2 | 4588 | req_set_fail(req); |
889fca73 | 4589 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4590 | return 0; |
4591 | #else | |
4592 | return -EOPNOTSUPP; | |
4593 | #endif | |
4594 | } | |
4595 | ||
c1ca757b JA |
4596 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4597 | { | |
4598 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4599 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4600 | return -EINVAL; |
3232dd02 PB |
4601 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4602 | return -EINVAL; | |
c1ca757b JA |
4603 | |
4604 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4605 | req->madvise.len = READ_ONCE(sqe->len); | |
4606 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4607 | return 0; | |
4608 | #else | |
4609 | return -EOPNOTSUPP; | |
4610 | #endif | |
4611 | } | |
4612 | ||
45d189c6 | 4613 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4614 | { |
4615 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4616 | struct io_madvise *ma = &req->madvise; | |
4617 | int ret; | |
4618 | ||
45d189c6 | 4619 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4620 | return -EAGAIN; |
4621 | ||
0726b01e | 4622 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4623 | if (ret < 0) |
93d2bcd2 | 4624 | req_set_fail(req); |
e1e16097 | 4625 | io_req_complete(req, ret); |
c1ca757b JA |
4626 | return 0; |
4627 | #else | |
4628 | return -EOPNOTSUPP; | |
4629 | #endif | |
4630 | } | |
4631 | ||
4840e418 JA |
4632 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4633 | { | |
26578cda | 4634 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4635 | return -EINVAL; |
3232dd02 PB |
4636 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4637 | return -EINVAL; | |
4840e418 JA |
4638 | |
4639 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4640 | req->fadvise.len = READ_ONCE(sqe->len); | |
4641 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4642 | return 0; | |
4643 | } | |
4644 | ||
45d189c6 | 4645 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4646 | { |
4647 | struct io_fadvise *fa = &req->fadvise; | |
4648 | int ret; | |
4649 | ||
45d189c6 | 4650 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4651 | switch (fa->advice) { |
4652 | case POSIX_FADV_NORMAL: | |
4653 | case POSIX_FADV_RANDOM: | |
4654 | case POSIX_FADV_SEQUENTIAL: | |
4655 | break; | |
4656 | default: | |
4657 | return -EAGAIN; | |
4658 | } | |
4659 | } | |
4840e418 JA |
4660 | |
4661 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4662 | if (ret < 0) | |
93d2bcd2 | 4663 | req_set_fail(req); |
0bdf3398 | 4664 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4665 | return 0; |
4666 | } | |
4667 | ||
eddc7ef5 JA |
4668 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4669 | { | |
2d74d042 | 4670 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4671 | return -EINVAL; |
26578cda | 4672 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4673 | return -EINVAL; |
9c280f90 | 4674 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4675 | return -EBADF; |
eddc7ef5 | 4676 | |
1d9e1288 BM |
4677 | req->statx.dfd = READ_ONCE(sqe->fd); |
4678 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4679 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4680 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4681 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4682 | |
4683 | return 0; | |
4684 | } | |
4685 | ||
45d189c6 | 4686 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4687 | { |
1d9e1288 | 4688 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4689 | int ret; |
4690 | ||
59d70013 | 4691 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4692 | return -EAGAIN; |
4693 | ||
e62753e4 BM |
4694 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4695 | ctx->buffer); | |
eddc7ef5 | 4696 | |
eddc7ef5 | 4697 | if (ret < 0) |
93d2bcd2 | 4698 | req_set_fail(req); |
e1e16097 | 4699 | io_req_complete(req, ret); |
eddc7ef5 JA |
4700 | return 0; |
4701 | } | |
4702 | ||
b5dba59e JA |
4703 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4704 | { | |
14587a46 | 4705 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4706 | return -EINVAL; |
b5dba59e | 4707 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 4708 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 4709 | return -EINVAL; |
9c280f90 | 4710 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4711 | return -EBADF; |
b5dba59e JA |
4712 | |
4713 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
4714 | req->close.file_slot = READ_ONCE(sqe->file_index); |
4715 | if (req->close.file_slot && req->close.fd) | |
4716 | return -EINVAL; | |
4717 | ||
b5dba59e | 4718 | return 0; |
b5dba59e JA |
4719 | } |
4720 | ||
889fca73 | 4721 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4722 | { |
9eac1904 | 4723 | struct files_struct *files = current->files; |
3af73b28 | 4724 | struct io_close *close = &req->close; |
9eac1904 | 4725 | struct fdtable *fdt; |
a1fde923 PB |
4726 | struct file *file = NULL; |
4727 | int ret = -EBADF; | |
b5dba59e | 4728 | |
7df778be PB |
4729 | if (req->close.file_slot) { |
4730 | ret = io_close_fixed(req, issue_flags); | |
4731 | goto err; | |
4732 | } | |
4733 | ||
9eac1904 JA |
4734 | spin_lock(&files->file_lock); |
4735 | fdt = files_fdtable(files); | |
4736 | if (close->fd >= fdt->max_fds) { | |
4737 | spin_unlock(&files->file_lock); | |
4738 | goto err; | |
4739 | } | |
4740 | file = fdt->fd[close->fd]; | |
a1fde923 | 4741 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4742 | spin_unlock(&files->file_lock); |
4743 | file = NULL; | |
4744 | goto err; | |
3af73b28 | 4745 | } |
b5dba59e JA |
4746 | |
4747 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4748 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4749 | spin_unlock(&files->file_lock); |
0bf0eefd | 4750 | return -EAGAIN; |
a2100672 | 4751 | } |
b5dba59e | 4752 | |
9eac1904 JA |
4753 | ret = __close_fd_get_file(close->fd, &file); |
4754 | spin_unlock(&files->file_lock); | |
4755 | if (ret < 0) { | |
4756 | if (ret == -ENOENT) | |
4757 | ret = -EBADF; | |
4758 | goto err; | |
4759 | } | |
4760 | ||
3af73b28 | 4761 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4762 | ret = filp_close(file, current->files); |
4763 | err: | |
3af73b28 | 4764 | if (ret < 0) |
93d2bcd2 | 4765 | req_set_fail(req); |
9eac1904 JA |
4766 | if (file) |
4767 | fput(file); | |
889fca73 | 4768 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4769 | return 0; |
b5dba59e JA |
4770 | } |
4771 | ||
1155c76a | 4772 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4773 | { |
4774 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4775 | |
5d17b4a4 JA |
4776 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4777 | return -EINVAL; | |
26578cda PB |
4778 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4779 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4780 | return -EINVAL; |
4781 | ||
8ed8d3c3 JA |
4782 | req->sync.off = READ_ONCE(sqe->off); |
4783 | req->sync.len = READ_ONCE(sqe->len); | |
4784 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4785 | return 0; |
4786 | } | |
4787 | ||
45d189c6 | 4788 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4789 | { |
8ed8d3c3 JA |
4790 | int ret; |
4791 | ||
ac45abc0 | 4792 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4793 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4794 | return -EAGAIN; |
4795 | ||
9adbd45d | 4796 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4797 | req->sync.flags); |
4798 | if (ret < 0) | |
93d2bcd2 | 4799 | req_set_fail(req); |
e1e16097 | 4800 | io_req_complete(req, ret); |
5d17b4a4 JA |
4801 | return 0; |
4802 | } | |
4803 | ||
469956e8 | 4804 | #if defined(CONFIG_NET) |
02d27d89 PB |
4805 | static int io_setup_async_msg(struct io_kiocb *req, |
4806 | struct io_async_msghdr *kmsg) | |
4807 | { | |
e8c2bc1f JA |
4808 | struct io_async_msghdr *async_msg = req->async_data; |
4809 | ||
4810 | if (async_msg) | |
02d27d89 | 4811 | return -EAGAIN; |
e8c2bc1f | 4812 | if (io_alloc_async_data(req)) { |
257e84a5 | 4813 | kfree(kmsg->free_iov); |
02d27d89 PB |
4814 | return -ENOMEM; |
4815 | } | |
e8c2bc1f | 4816 | async_msg = req->async_data; |
02d27d89 | 4817 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4818 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4819 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4820 | /* if were using fast_iov, set it to the new one */ |
4821 | if (!async_msg->free_iov) | |
4822 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4823 | ||
02d27d89 PB |
4824 | return -EAGAIN; |
4825 | } | |
4826 | ||
2ae523ed PB |
4827 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4828 | struct io_async_msghdr *iomsg) | |
4829 | { | |
2ae523ed | 4830 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4831 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4832 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4833 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4834 | } |
4835 | ||
93642ef8 PB |
4836 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4837 | { | |
4838 | int ret; | |
4839 | ||
93642ef8 PB |
4840 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4841 | if (!ret) | |
4842 | req->flags |= REQ_F_NEED_CLEANUP; | |
4843 | return ret; | |
4844 | } | |
4845 | ||
3529d8c2 | 4846 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4847 | { |
e47293fd | 4848 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4849 | |
d2b6f48b PB |
4850 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4851 | return -EINVAL; | |
4852 | ||
270a5940 | 4853 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4854 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4855 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4856 | if (sr->msg_flags & MSG_DONTWAIT) | |
4857 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4858 | |
d8768362 JA |
4859 | #ifdef CONFIG_COMPAT |
4860 | if (req->ctx->compat) | |
4861 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4862 | #endif | |
93642ef8 | 4863 | return 0; |
03b1230c JA |
4864 | } |
4865 | ||
889fca73 | 4866 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4867 | { |
6b754c8b | 4868 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4869 | struct socket *sock; |
7a7cacba | 4870 | unsigned flags; |
0031275d | 4871 | int min_ret = 0; |
0fa03c62 JA |
4872 | int ret; |
4873 | ||
dba4a925 | 4874 | sock = sock_from_file(req->file); |
7a7cacba | 4875 | if (unlikely(!sock)) |
dba4a925 | 4876 | return -ENOTSOCK; |
3529d8c2 | 4877 | |
d886e185 PB |
4878 | if (req_has_async_data(req)) { |
4879 | kmsg = req->async_data; | |
4880 | } else { | |
7a7cacba PB |
4881 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4882 | if (ret) | |
4883 | return ret; | |
4884 | kmsg = &iomsg; | |
0fa03c62 | 4885 | } |
0fa03c62 | 4886 | |
04411806 PB |
4887 | flags = req->sr_msg.msg_flags; |
4888 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4889 | flags |= MSG_DONTWAIT; |
0031275d SM |
4890 | if (flags & MSG_WAITALL) |
4891 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4892 | ||
7a7cacba | 4893 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
0fa03c62 | 4894 | |
7297ce3d PB |
4895 | if (ret < min_ret) { |
4896 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
4897 | return io_setup_async_msg(req, kmsg); | |
4898 | if (ret == -ERESTARTSYS) | |
4899 | ret = -EINTR; | |
4900 | req_set_fail(req); | |
4901 | } | |
257e84a5 PB |
4902 | /* fast path, check for non-NULL to avoid function call */ |
4903 | if (kmsg->free_iov) | |
4904 | kfree(kmsg->free_iov); | |
99bc4c38 | 4905 | req->flags &= ~REQ_F_NEED_CLEANUP; |
889fca73 | 4906 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4907 | return 0; |
03b1230c | 4908 | } |
aa1fa28f | 4909 | |
889fca73 | 4910 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4911 | { |
7a7cacba PB |
4912 | struct io_sr_msg *sr = &req->sr_msg; |
4913 | struct msghdr msg; | |
4914 | struct iovec iov; | |
fddaface | 4915 | struct socket *sock; |
7a7cacba | 4916 | unsigned flags; |
0031275d | 4917 | int min_ret = 0; |
fddaface JA |
4918 | int ret; |
4919 | ||
dba4a925 | 4920 | sock = sock_from_file(req->file); |
7a7cacba | 4921 | if (unlikely(!sock)) |
dba4a925 | 4922 | return -ENOTSOCK; |
fddaface | 4923 | |
7a7cacba PB |
4924 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4925 | if (unlikely(ret)) | |
14db8411 | 4926 | return ret; |
fddaface | 4927 | |
7a7cacba PB |
4928 | msg.msg_name = NULL; |
4929 | msg.msg_control = NULL; | |
4930 | msg.msg_controllen = 0; | |
4931 | msg.msg_namelen = 0; | |
fddaface | 4932 | |
04411806 PB |
4933 | flags = req->sr_msg.msg_flags; |
4934 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4935 | flags |= MSG_DONTWAIT; |
0031275d SM |
4936 | if (flags & MSG_WAITALL) |
4937 | min_ret = iov_iter_count(&msg.msg_iter); | |
4938 | ||
7a7cacba PB |
4939 | msg.msg_flags = flags; |
4940 | ret = sock_sendmsg(sock, &msg); | |
7297ce3d PB |
4941 | if (ret < min_ret) { |
4942 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
4943 | return -EAGAIN; | |
4944 | if (ret == -ERESTARTSYS) | |
4945 | ret = -EINTR; | |
93d2bcd2 | 4946 | req_set_fail(req); |
7297ce3d | 4947 | } |
889fca73 | 4948 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4949 | return 0; |
fddaface JA |
4950 | } |
4951 | ||
1400e697 PB |
4952 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4953 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4954 | { |
4955 | struct io_sr_msg *sr = &req->sr_msg; | |
4956 | struct iovec __user *uiov; | |
4957 | size_t iov_len; | |
4958 | int ret; | |
4959 | ||
1400e697 PB |
4960 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4961 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4962 | if (ret) |
4963 | return ret; | |
4964 | ||
4965 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4966 | if (iov_len > 1) | |
4967 | return -EINVAL; | |
5476dfed | 4968 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4969 | return -EFAULT; |
5476dfed | 4970 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4971 | iomsg->free_iov = NULL; |
52de1fe1 | 4972 | } else { |
257e84a5 | 4973 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4974 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4975 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4976 | false); |
52de1fe1 JA |
4977 | if (ret > 0) |
4978 | ret = 0; | |
4979 | } | |
4980 | ||
4981 | return ret; | |
4982 | } | |
4983 | ||
4984 | #ifdef CONFIG_COMPAT | |
4985 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4986 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4987 | { |
52de1fe1 JA |
4988 | struct io_sr_msg *sr = &req->sr_msg; |
4989 | struct compat_iovec __user *uiov; | |
4990 | compat_uptr_t ptr; | |
4991 | compat_size_t len; | |
4992 | int ret; | |
4993 | ||
4af3417a PB |
4994 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4995 | &ptr, &len); | |
52de1fe1 JA |
4996 | if (ret) |
4997 | return ret; | |
4998 | ||
4999 | uiov = compat_ptr(ptr); | |
5000 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
5001 | compat_ssize_t clen; | |
5002 | ||
5003 | if (len > 1) | |
5004 | return -EINVAL; | |
5005 | if (!access_ok(uiov, sizeof(*uiov))) | |
5006 | return -EFAULT; | |
5007 | if (__get_user(clen, &uiov->iov_len)) | |
5008 | return -EFAULT; | |
5009 | if (clen < 0) | |
5010 | return -EINVAL; | |
2d280bc8 | 5011 | sr->len = clen; |
257e84a5 | 5012 | iomsg->free_iov = NULL; |
52de1fe1 | 5013 | } else { |
257e84a5 | 5014 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 5015 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 5016 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 5017 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
5018 | if (ret < 0) |
5019 | return ret; | |
5020 | } | |
5021 | ||
5022 | return 0; | |
5023 | } | |
5024 | #endif | |
5025 | ||
1400e697 PB |
5026 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
5027 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 5028 | { |
1400e697 | 5029 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
5030 | |
5031 | #ifdef CONFIG_COMPAT | |
5032 | if (req->ctx->compat) | |
1400e697 | 5033 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 5034 | #endif |
52de1fe1 | 5035 | |
1400e697 | 5036 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
5037 | } |
5038 | ||
bcda7baa | 5039 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
51aac424 | 5040 | unsigned int issue_flags) |
bcda7baa JA |
5041 | { |
5042 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 5043 | |
51aac424 | 5044 | return io_buffer_select(req, &sr->len, sr->bgid, issue_flags); |
fddaface JA |
5045 | } |
5046 | ||
93642ef8 | 5047 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 5048 | { |
99bc4c38 | 5049 | int ret; |
3529d8c2 | 5050 | |
93642ef8 PB |
5051 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
5052 | if (!ret) | |
5053 | req->flags |= REQ_F_NEED_CLEANUP; | |
5054 | return ret; | |
5055 | } | |
5056 | ||
5057 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5058 | { | |
5059 | struct io_sr_msg *sr = &req->sr_msg; | |
5060 | ||
d2b6f48b PB |
5061 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5062 | return -EINVAL; | |
5063 | ||
270a5940 | 5064 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 5065 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 5066 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
5067 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5068 | if (sr->msg_flags & MSG_DONTWAIT) | |
5069 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 5070 | |
d8768362 JA |
5071 | #ifdef CONFIG_COMPAT |
5072 | if (req->ctx->compat) | |
5073 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5074 | #endif | |
93642ef8 | 5075 | return 0; |
aa1fa28f JA |
5076 | } |
5077 | ||
889fca73 | 5078 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5079 | { |
6b754c8b | 5080 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 5081 | struct socket *sock; |
7fbb1b54 | 5082 | struct io_buffer *kbuf; |
7a7cacba | 5083 | unsigned flags; |
d1fd1c20 | 5084 | int ret, min_ret = 0; |
45d189c6 | 5085 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 5086 | |
dba4a925 | 5087 | sock = sock_from_file(req->file); |
7a7cacba | 5088 | if (unlikely(!sock)) |
dba4a925 | 5089 | return -ENOTSOCK; |
3529d8c2 | 5090 | |
d886e185 PB |
5091 | if (req_has_async_data(req)) { |
5092 | kmsg = req->async_data; | |
5093 | } else { | |
7a7cacba PB |
5094 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
5095 | if (ret) | |
681fda8d | 5096 | return ret; |
7a7cacba PB |
5097 | kmsg = &iomsg; |
5098 | } | |
03b1230c | 5099 | |
bc02ef33 | 5100 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5101 | kbuf = io_recv_buffer_select(req, issue_flags); |
bc02ef33 | 5102 | if (IS_ERR(kbuf)) |
52de1fe1 | 5103 | return PTR_ERR(kbuf); |
7a7cacba | 5104 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
5105 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
5106 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
5107 | 1, req->sr_msg.len); |
5108 | } | |
52de1fe1 | 5109 | |
04411806 PB |
5110 | flags = req->sr_msg.msg_flags; |
5111 | if (force_nonblock) | |
7a7cacba | 5112 | flags |= MSG_DONTWAIT; |
0031275d SM |
5113 | if (flags & MSG_WAITALL) |
5114 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5115 | ||
7a7cacba PB |
5116 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
5117 | kmsg->uaddr, flags); | |
7297ce3d PB |
5118 | if (ret < min_ret) { |
5119 | if (ret == -EAGAIN && force_nonblock) | |
5120 | return io_setup_async_msg(req, kmsg); | |
5121 | if (ret == -ERESTARTSYS) | |
5122 | ret = -EINTR; | |
5123 | req_set_fail(req); | |
5124 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
5125 | req_set_fail(req); | |
5126 | } | |
03b1230c | 5127 | |
257e84a5 PB |
5128 | /* fast path, check for non-NULL to avoid function call */ |
5129 | if (kmsg->free_iov) | |
5130 | kfree(kmsg->free_iov); | |
99bc4c38 | 5131 | req->flags &= ~REQ_F_NEED_CLEANUP; |
d1fd1c20 | 5132 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req)); |
03b1230c | 5133 | return 0; |
0fa03c62 | 5134 | } |
5d17b4a4 | 5135 | |
889fca73 | 5136 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5137 | { |
6b754c8b | 5138 | struct io_buffer *kbuf; |
7a7cacba PB |
5139 | struct io_sr_msg *sr = &req->sr_msg; |
5140 | struct msghdr msg; | |
5141 | void __user *buf = sr->buf; | |
fddaface | 5142 | struct socket *sock; |
7a7cacba PB |
5143 | struct iovec iov; |
5144 | unsigned flags; | |
d1fd1c20 | 5145 | int ret, min_ret = 0; |
45d189c6 | 5146 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5147 | |
dba4a925 | 5148 | sock = sock_from_file(req->file); |
7a7cacba | 5149 | if (unlikely(!sock)) |
dba4a925 | 5150 | return -ENOTSOCK; |
fddaface | 5151 | |
bc02ef33 | 5152 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5153 | kbuf = io_recv_buffer_select(req, issue_flags); |
bcda7baa JA |
5154 | if (IS_ERR(kbuf)) |
5155 | return PTR_ERR(kbuf); | |
7a7cacba | 5156 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5157 | } |
bcda7baa | 5158 | |
7a7cacba | 5159 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5160 | if (unlikely(ret)) |
5161 | goto out_free; | |
fddaface | 5162 | |
7a7cacba PB |
5163 | msg.msg_name = NULL; |
5164 | msg.msg_control = NULL; | |
5165 | msg.msg_controllen = 0; | |
5166 | msg.msg_namelen = 0; | |
5167 | msg.msg_iocb = NULL; | |
5168 | msg.msg_flags = 0; | |
fddaface | 5169 | |
04411806 PB |
5170 | flags = req->sr_msg.msg_flags; |
5171 | if (force_nonblock) | |
7a7cacba | 5172 | flags |= MSG_DONTWAIT; |
0031275d SM |
5173 | if (flags & MSG_WAITALL) |
5174 | min_ret = iov_iter_count(&msg.msg_iter); | |
5175 | ||
7a7cacba | 5176 | ret = sock_recvmsg(sock, &msg, flags); |
14c32eee | 5177 | out_free: |
7297ce3d PB |
5178 | if (ret < min_ret) { |
5179 | if (ret == -EAGAIN && force_nonblock) | |
5180 | return -EAGAIN; | |
5181 | if (ret == -ERESTARTSYS) | |
5182 | ret = -EINTR; | |
5183 | req_set_fail(req); | |
5184 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
5185 | req_set_fail(req); | |
5186 | } | |
d1fd1c20 PB |
5187 | |
5188 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req)); | |
fddaface | 5189 | return 0; |
fddaface JA |
5190 | } |
5191 | ||
3529d8c2 | 5192 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5193 | { |
8ed8d3c3 JA |
5194 | struct io_accept *accept = &req->accept; |
5195 | ||
14587a46 | 5196 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5197 | return -EINVAL; |
aaa4db12 | 5198 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5199 | return -EINVAL; |
5200 | ||
d55e5f5b JA |
5201 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5202 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5203 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5204 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5205 | |
aaa4db12 PB |
5206 | accept->file_slot = READ_ONCE(sqe->file_index); |
5207 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
5208 | (accept->flags & SOCK_CLOEXEC))) | |
5209 | return -EINVAL; | |
a7083ad5 PB |
5210 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5211 | return -EINVAL; | |
5212 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5213 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5214 | return 0; |
8ed8d3c3 | 5215 | } |
17f2fe35 | 5216 | |
889fca73 | 5217 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5218 | { |
5219 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5220 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5221 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5222 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5223 | struct file *file; |
5224 | int ret, fd; | |
8ed8d3c3 | 5225 | |
e697deed JX |
5226 | if (req->file->f_flags & O_NONBLOCK) |
5227 | req->flags |= REQ_F_NOWAIT; | |
5228 | ||
aaa4db12 PB |
5229 | if (!fixed) { |
5230 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5231 | if (unlikely(fd < 0)) | |
5232 | return fd; | |
5233 | } | |
a7083ad5 PB |
5234 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5235 | accept->flags); | |
5236 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5237 | if (!fixed) |
5238 | put_unused_fd(fd); | |
a7083ad5 PB |
5239 | ret = PTR_ERR(file); |
5240 | if (ret == -EAGAIN && force_nonblock) | |
5241 | return -EAGAIN; | |
ac45abc0 PB |
5242 | if (ret == -ERESTARTSYS) |
5243 | ret = -EINTR; | |
93d2bcd2 | 5244 | req_set_fail(req); |
aaa4db12 | 5245 | } else if (!fixed) { |
a7083ad5 PB |
5246 | fd_install(fd, file); |
5247 | ret = fd; | |
aaa4db12 PB |
5248 | } else { |
5249 | ret = io_install_fixed_file(req, file, issue_flags, | |
5250 | accept->file_slot - 1); | |
ac45abc0 | 5251 | } |
889fca73 | 5252 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5253 | return 0; |
8ed8d3c3 JA |
5254 | } |
5255 | ||
93642ef8 PB |
5256 | static int io_connect_prep_async(struct io_kiocb *req) |
5257 | { | |
5258 | struct io_async_connect *io = req->async_data; | |
5259 | struct io_connect *conn = &req->connect; | |
5260 | ||
5261 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5262 | } | |
5263 | ||
3529d8c2 | 5264 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5265 | { |
3529d8c2 | 5266 | struct io_connect *conn = &req->connect; |
f499a021 | 5267 | |
14587a46 | 5268 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5269 | return -EINVAL; |
26578cda PB |
5270 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5271 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5272 | return -EINVAL; |
5273 | ||
3529d8c2 JA |
5274 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5275 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5276 | return 0; |
f499a021 JA |
5277 | } |
5278 | ||
889fca73 | 5279 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5280 | { |
e8c2bc1f | 5281 | struct io_async_connect __io, *io; |
f8e85cf2 | 5282 | unsigned file_flags; |
3fbb51c1 | 5283 | int ret; |
45d189c6 | 5284 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5285 | |
d886e185 | 5286 | if (req_has_async_data(req)) { |
e8c2bc1f | 5287 | io = req->async_data; |
f499a021 | 5288 | } else { |
3529d8c2 JA |
5289 | ret = move_addr_to_kernel(req->connect.addr, |
5290 | req->connect.addr_len, | |
e8c2bc1f | 5291 | &__io.address); |
f499a021 JA |
5292 | if (ret) |
5293 | goto out; | |
5294 | io = &__io; | |
5295 | } | |
5296 | ||
3fbb51c1 JA |
5297 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5298 | ||
e8c2bc1f | 5299 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5300 | req->connect.addr_len, file_flags); |
87f80d62 | 5301 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 5302 | if (req_has_async_data(req)) |
b7bb4f7d | 5303 | return -EAGAIN; |
e8c2bc1f | 5304 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5305 | ret = -ENOMEM; |
5306 | goto out; | |
5307 | } | |
e8c2bc1f | 5308 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5309 | return -EAGAIN; |
f499a021 | 5310 | } |
f8e85cf2 JA |
5311 | if (ret == -ERESTARTSYS) |
5312 | ret = -EINTR; | |
f499a021 | 5313 | out: |
4e88d6e7 | 5314 | if (ret < 0) |
93d2bcd2 | 5315 | req_set_fail(req); |
889fca73 | 5316 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5317 | return 0; |
469956e8 Y |
5318 | } |
5319 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5320 | #define IO_NETOP_FN(op) \ |
5321 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5322 | { \ | |
5323 | return -EOPNOTSUPP; \ | |
5324 | } | |
5325 | ||
5326 | #define IO_NETOP_PREP(op) \ | |
5327 | IO_NETOP_FN(op) \ | |
5328 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5329 | { \ | |
5330 | return -EOPNOTSUPP; \ | |
5331 | } \ | |
5332 | ||
5333 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5334 | IO_NETOP_PREP(op) \ | |
5335 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5336 | { \ | |
5337 | return -EOPNOTSUPP; \ | |
5338 | } | |
5339 | ||
5340 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5341 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5342 | IO_NETOP_PREP_ASYNC(connect); | |
5343 | IO_NETOP_PREP(accept); | |
5344 | IO_NETOP_FN(send); | |
5345 | IO_NETOP_FN(recv); | |
469956e8 | 5346 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5347 | |
d7718a9d JA |
5348 | struct io_poll_table { |
5349 | struct poll_table_struct pt; | |
5350 | struct io_kiocb *req; | |
68b11e8b | 5351 | int nr_entries; |
d7718a9d JA |
5352 | int error; |
5353 | }; | |
ce593a6c | 5354 | |
aa43477b PB |
5355 | #define IO_POLL_CANCEL_FLAG BIT(31) |
5356 | #define IO_POLL_REF_MASK ((1u << 20)-1) | |
5357 | ||
5358 | /* | |
5359 | * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can | |
5360 | * bump it and acquire ownership. It's disallowed to modify requests while not | |
5361 | * owning it, that prevents from races for enqueueing task_work's and b/w | |
5362 | * arming poll and wakeups. | |
5363 | */ | |
5364 | static inline bool io_poll_get_ownership(struct io_kiocb *req) | |
5365 | { | |
5366 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); | |
5367 | } | |
5368 | ||
5369 | static void io_poll_mark_cancelled(struct io_kiocb *req) | |
5370 | { | |
5371 | atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); | |
5372 | } | |
5373 | ||
5641897a PB |
5374 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
5375 | { | |
5376 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ | |
5377 | if (req->opcode == IORING_OP_POLL_ADD) | |
5378 | return req->async_data; | |
5379 | return req->apoll->double_poll; | |
5380 | } | |
5381 | ||
5382 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5383 | { | |
5384 | if (req->opcode == IORING_OP_POLL_ADD) | |
5385 | return &req->poll; | |
5386 | return &req->apoll->poll; | |
5387 | } | |
5388 | ||
5389 | static void io_poll_req_insert(struct io_kiocb *req) | |
5390 | { | |
5391 | struct io_ring_ctx *ctx = req->ctx; | |
5392 | struct hlist_head *list; | |
5393 | ||
5394 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5395 | hlist_add_head(&req->hash_node, list); | |
5396 | } | |
5397 | ||
5398 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5399 | wait_queue_func_t wake_func) | |
5400 | { | |
5401 | poll->head = NULL; | |
5641897a PB |
5402 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5403 | /* mask in events that we always want/need */ | |
5404 | poll->events = events | IO_POLL_UNMASK; | |
5405 | INIT_LIST_HEAD(&poll->wait.entry); | |
5406 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5407 | } | |
5408 | ||
aa43477b | 5409 | static inline void io_poll_remove_entry(struct io_poll_iocb *poll) |
d7718a9d | 5410 | { |
aa43477b | 5411 | struct wait_queue_head *head = poll->head; |
d7718a9d | 5412 | |
aa43477b | 5413 | spin_lock_irq(&head->lock); |
d7718a9d | 5414 | list_del_init(&poll->wait.entry); |
aa43477b PB |
5415 | poll->head = NULL; |
5416 | spin_unlock_irq(&head->lock); | |
5417 | } | |
d7718a9d | 5418 | |
aa43477b PB |
5419 | static void io_poll_remove_entries(struct io_kiocb *req) |
5420 | { | |
5421 | struct io_poll_iocb *poll = io_poll_get_single(req); | |
5422 | struct io_poll_iocb *poll_double = io_poll_get_double(req); | |
6d816e08 | 5423 | |
aa43477b PB |
5424 | if (poll->head) |
5425 | io_poll_remove_entry(poll); | |
5426 | if (poll_double && poll_double->head) | |
5427 | io_poll_remove_entry(poll_double); | |
d7718a9d JA |
5428 | } |
5429 | ||
aa43477b PB |
5430 | /* |
5431 | * All poll tw should go through this. Checks for poll events, manages | |
5432 | * references, does rewait, etc. | |
5433 | * | |
5434 | * Returns a negative error on failure. >0 when no action require, which is | |
5435 | * either spurious wakeup or multishot CQE is served. 0 when it's done with | |
5436 | * the request, then the mask is stored in req->result. | |
5437 | */ | |
5438 | static int io_poll_check_events(struct io_kiocb *req) | |
74ce6ce4 JA |
5439 | { |
5440 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b PB |
5441 | struct io_poll_iocb *poll = io_poll_get_single(req); |
5442 | int v; | |
74ce6ce4 | 5443 | |
316319e8 | 5444 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 | 5445 | if (unlikely(req->task->flags & PF_EXITING)) |
aa43477b | 5446 | io_poll_mark_cancelled(req); |
e09ee510 | 5447 | |
aa43477b PB |
5448 | do { |
5449 | v = atomic_read(&req->poll_refs); | |
74ce6ce4 | 5450 | |
aa43477b PB |
5451 | /* tw handler should be the owner, and so have some references */ |
5452 | if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) | |
5453 | return 0; | |
5454 | if (v & IO_POLL_CANCEL_FLAG) | |
5455 | return -ECANCELED; | |
74ce6ce4 | 5456 | |
aa43477b PB |
5457 | if (!req->result) { |
5458 | struct poll_table_struct pt = { ._key = poll->events }; | |
74ce6ce4 | 5459 | |
aa43477b PB |
5460 | req->result = vfs_poll(req->file, &pt) & poll->events; |
5461 | } | |
74ce6ce4 | 5462 | |
aa43477b PB |
5463 | /* multishot, just fill an CQE and proceed */ |
5464 | if (req->result && !(poll->events & EPOLLONESHOT)) { | |
5465 | __poll_t mask = mangle_poll(req->result & poll->events); | |
5466 | bool filled; | |
18bceab1 | 5467 | |
aa43477b PB |
5468 | spin_lock(&ctx->completion_lock); |
5469 | filled = io_fill_cqe_aux(ctx, req->user_data, mask, | |
5470 | IORING_CQE_F_MORE); | |
5471 | io_commit_cqring(ctx); | |
5472 | spin_unlock(&ctx->completion_lock); | |
5473 | if (unlikely(!filled)) | |
5474 | return -ECANCELED; | |
5475 | io_cqring_ev_posted(ctx); | |
5476 | } else if (req->result) { | |
5477 | return 0; | |
5478 | } | |
18bceab1 | 5479 | |
aa43477b PB |
5480 | /* |
5481 | * Release all references, retry if someone tried to restart | |
5482 | * task_work while we were executing it. | |
5483 | */ | |
5484 | } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs)); | |
18bceab1 | 5485 | |
aa43477b | 5486 | return 1; |
18bceab1 JA |
5487 | } |
5488 | ||
aa43477b | 5489 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5490 | { |
5491 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 5492 | int ret; |
18bceab1 | 5493 | |
aa43477b PB |
5494 | ret = io_poll_check_events(req); |
5495 | if (ret > 0) | |
5496 | return; | |
5497 | ||
5498 | if (!ret) { | |
5499 | req->result = mangle_poll(req->result & req->poll.events); | |
e27414be | 5500 | } else { |
aa43477b PB |
5501 | req->result = ret; |
5502 | req_set_fail(req); | |
a62682f9 | 5503 | } |
aa43477b PB |
5504 | |
5505 | io_poll_remove_entries(req); | |
5506 | spin_lock(&ctx->completion_lock); | |
5507 | hash_del(&req->hash_node); | |
5508 | __io_req_complete_post(req, req->result, 0); | |
5509 | io_commit_cqring(ctx); | |
5510 | spin_unlock(&ctx->completion_lock); | |
5511 | io_cqring_ev_posted(ctx); | |
18bceab1 JA |
5512 | } |
5513 | ||
aa43477b | 5514 | static void io_apoll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5515 | { |
5516 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 5517 | int ret; |
18bceab1 | 5518 | |
aa43477b PB |
5519 | ret = io_poll_check_events(req); |
5520 | if (ret > 0) | |
5521 | return; | |
18bceab1 | 5522 | |
aa43477b PB |
5523 | io_poll_remove_entries(req); |
5524 | spin_lock(&ctx->completion_lock); | |
5525 | hash_del(&req->hash_node); | |
5526 | spin_unlock(&ctx->completion_lock); | |
18bceab1 | 5527 | |
aa43477b PB |
5528 | if (!ret) |
5529 | io_req_task_submit(req, locked); | |
5530 | else | |
5531 | io_req_complete_failed(req, ret); | |
18bceab1 JA |
5532 | } |
5533 | ||
aa43477b PB |
5534 | static void __io_poll_execute(struct io_kiocb *req, int mask) |
5535 | { | |
5536 | req->result = mask; | |
5537 | if (req->opcode == IORING_OP_POLL_ADD) | |
5538 | req->io_task_work.func = io_poll_task_func; | |
5539 | else | |
5540 | req->io_task_work.func = io_apoll_task_func; | |
5541 | ||
5542 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5543 | io_req_task_work_add(req, false); | |
5544 | } | |
5545 | ||
5546 | static inline void io_poll_execute(struct io_kiocb *req, int res) | |
5547 | { | |
5548 | if (io_poll_get_ownership(req)) | |
5549 | __io_poll_execute(req, res); | |
5550 | } | |
5551 | ||
5552 | static void io_poll_cancel_req(struct io_kiocb *req) | |
5553 | { | |
5554 | io_poll_mark_cancelled(req); | |
5555 | /* kick tw, which should complete the request */ | |
5556 | io_poll_execute(req, 0); | |
5557 | } | |
5558 | ||
5559 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5560 | void *key) | |
18bceab1 JA |
5561 | { |
5562 | struct io_kiocb *req = wait->private; | |
aa43477b PB |
5563 | struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, |
5564 | wait); | |
18bceab1 JA |
5565 | __poll_t mask = key_to_poll(key); |
5566 | ||
aa43477b | 5567 | /* for instances that support it check for an event match first */ |
18bceab1 JA |
5568 | if (mask && !(mask & poll->events)) |
5569 | return 0; | |
5570 | ||
aa43477b PB |
5571 | if (io_poll_get_ownership(req)) |
5572 | __io_poll_execute(req, mask); | |
18bceab1 JA |
5573 | return 1; |
5574 | } | |
5575 | ||
18bceab1 | 5576 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, |
807abcb0 JA |
5577 | struct wait_queue_head *head, |
5578 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5579 | { |
5580 | struct io_kiocb *req = pt->req; | |
5581 | ||
5582 | /* | |
68b11e8b PB |
5583 | * The file being polled uses multiple waitqueues for poll handling |
5584 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5585 | * if this happens. | |
18bceab1 | 5586 | */ |
68b11e8b | 5587 | if (unlikely(pt->nr_entries)) { |
aa43477b | 5588 | struct io_poll_iocb *first = poll; |
58852d4d | 5589 | |
23a65db8 | 5590 | /* double add on the same waitqueue head, ignore */ |
aa43477b | 5591 | if (first->head == head) |
23a65db8 | 5592 | return; |
18bceab1 | 5593 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5594 | if (*poll_ptr) { |
23a65db8 PB |
5595 | if ((*poll_ptr)->head == head) |
5596 | return; | |
18bceab1 JA |
5597 | pt->error = -EINVAL; |
5598 | return; | |
5599 | } | |
aa43477b | 5600 | |
18bceab1 JA |
5601 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5602 | if (!poll) { | |
5603 | pt->error = -ENOMEM; | |
5604 | return; | |
5605 | } | |
aa43477b | 5606 | io_init_poll_iocb(poll, first->events, first->wait.func); |
807abcb0 | 5607 | *poll_ptr = poll; |
d886e185 PB |
5608 | if (req->opcode == IORING_OP_POLL_ADD) |
5609 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
5610 | } |
5611 | ||
68b11e8b | 5612 | pt->nr_entries++; |
18bceab1 | 5613 | poll->head = head; |
aa43477b | 5614 | poll->wait.private = req; |
a31eb4a2 JX |
5615 | |
5616 | if (poll->events & EPOLLEXCLUSIVE) | |
5617 | add_wait_queue_exclusive(head, &poll->wait); | |
5618 | else | |
5619 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5620 | } |
5621 | ||
aa43477b | 5622 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
18bceab1 JA |
5623 | struct poll_table_struct *p) |
5624 | { | |
5625 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5626 | ||
aa43477b PB |
5627 | __io_queue_proc(&pt->req->poll, pt, head, |
5628 | (struct io_poll_iocb **) &pt->req->async_data); | |
18bceab1 JA |
5629 | } |
5630 | ||
aa43477b PB |
5631 | static int __io_arm_poll_handler(struct io_kiocb *req, |
5632 | struct io_poll_iocb *poll, | |
5633 | struct io_poll_table *ipt, __poll_t mask) | |
d7718a9d | 5634 | { |
d7718a9d | 5635 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 5636 | int v; |
d7718a9d | 5637 | |
4d52f338 | 5638 | INIT_HLIST_NODE(&req->hash_node); |
aa43477b | 5639 | io_init_poll_iocb(poll, mask, io_poll_wake); |
b90cd197 | 5640 | poll->file = req->file; |
18bceab1 | 5641 | poll->wait.private = req; |
d7718a9d JA |
5642 | |
5643 | ipt->pt._key = mask; | |
5644 | ipt->req = req; | |
68b11e8b PB |
5645 | ipt->error = 0; |
5646 | ipt->nr_entries = 0; | |
d7718a9d | 5647 | |
aa43477b PB |
5648 | /* |
5649 | * Take the ownership to delay any tw execution up until we're done | |
5650 | * with poll arming. see io_poll_get_ownership(). | |
5651 | */ | |
5652 | atomic_set(&req->poll_refs, 1); | |
d7718a9d | 5653 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
aa43477b PB |
5654 | |
5655 | if (mask && (poll->events & EPOLLONESHOT)) { | |
5656 | io_poll_remove_entries(req); | |
5657 | /* no one else has access to the req, forget about the ref */ | |
5658 | return mask; | |
5659 | } | |
5660 | if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { | |
5661 | io_poll_remove_entries(req); | |
5662 | if (!ipt->error) | |
5663 | ipt->error = -EINVAL; | |
5664 | return 0; | |
5665 | } | |
d7718a9d | 5666 | |
79ebeaee | 5667 | spin_lock(&ctx->completion_lock); |
aa43477b PB |
5668 | io_poll_req_insert(req); |
5669 | spin_unlock(&ctx->completion_lock); | |
5670 | ||
5671 | if (mask) { | |
5672 | /* can't multishot if failed, just queue the event we've got */ | |
5673 | if (unlikely(ipt->error || !ipt->nr_entries)) | |
5674 | poll->events |= EPOLLONESHOT; | |
5675 | __io_poll_execute(req, mask); | |
5676 | return 0; | |
d7718a9d JA |
5677 | } |
5678 | ||
aa43477b PB |
5679 | /* |
5680 | * Release ownership. If someone tried to queue a tw while it was | |
5681 | * locked, kick it off for them. | |
5682 | */ | |
5683 | v = atomic_dec_return(&req->poll_refs); | |
5684 | if (unlikely(v & IO_POLL_REF_MASK)) | |
5685 | __io_poll_execute(req, 0); | |
5686 | return 0; | |
5687 | } | |
5688 | ||
5689 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5690 | struct poll_table_struct *p) | |
5691 | { | |
5692 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5693 | struct async_poll *apoll = pt->req->apoll; | |
5694 | ||
5695 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); | |
d7718a9d JA |
5696 | } |
5697 | ||
59b735ae OL |
5698 | enum { |
5699 | IO_APOLL_OK, | |
5700 | IO_APOLL_ABORTED, | |
5701 | IO_APOLL_READY | |
5702 | }; | |
5703 | ||
5704 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5705 | { |
5706 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5707 | struct io_ring_ctx *ctx = req->ctx; | |
5708 | struct async_poll *apoll; | |
5709 | struct io_poll_table ipt; | |
aa43477b PB |
5710 | __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI; |
5711 | int ret; | |
d7718a9d | 5712 | |
b2d9c3da PB |
5713 | if (!def->pollin && !def->pollout) |
5714 | return IO_APOLL_ABORTED; | |
658d0a40 PB |
5715 | if (!file_can_poll(req->file) || (req->flags & REQ_F_POLLED)) |
5716 | return IO_APOLL_ABORTED; | |
b2d9c3da PB |
5717 | |
5718 | if (def->pollin) { | |
b2d9c3da PB |
5719 | mask |= POLLIN | POLLRDNORM; |
5720 | ||
5721 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5722 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5723 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5724 | mask &= ~POLLIN; | |
5725 | } else { | |
b2d9c3da PB |
5726 | mask |= POLLOUT | POLLWRNORM; |
5727 | } | |
5728 | ||
d7718a9d JA |
5729 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); |
5730 | if (unlikely(!apoll)) | |
59b735ae | 5731 | return IO_APOLL_ABORTED; |
807abcb0 | 5732 | apoll->double_poll = NULL; |
d7718a9d | 5733 | req->apoll = apoll; |
b2d9c3da | 5734 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
5735 | ipt.pt._qproc = io_async_queue_proc; |
5736 | ||
aa43477b | 5737 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); |
41a5169c HX |
5738 | if (ret || ipt.error) |
5739 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5740 | ||
236daeae OL |
5741 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5742 | mask, apoll->poll.events); | |
59b735ae | 5743 | return IO_APOLL_OK; |
d7718a9d JA |
5744 | } |
5745 | ||
76e1b642 JA |
5746 | /* |
5747 | * Returns true if we found and killed one or more poll requests | |
5748 | */ | |
c072481d PB |
5749 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
5750 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 5751 | { |
78076bb6 | 5752 | struct hlist_node *tmp; |
221c5eb2 | 5753 | struct io_kiocb *req; |
aa43477b PB |
5754 | bool found = false; |
5755 | int i; | |
221c5eb2 | 5756 | |
79ebeaee | 5757 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5758 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5759 | struct hlist_head *list; | |
5760 | ||
5761 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5762 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
aa43477b PB |
5763 | if (io_match_task(req, tsk, cancel_all)) { |
5764 | io_poll_cancel_req(req); | |
5765 | found = true; | |
5766 | } | |
f3606e3a | 5767 | } |
221c5eb2 | 5768 | } |
79ebeaee | 5769 | spin_unlock(&ctx->completion_lock); |
aa43477b | 5770 | return found; |
221c5eb2 JA |
5771 | } |
5772 | ||
9ba5fac8 PB |
5773 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5774 | bool poll_only) | |
e07785b0 | 5775 | __must_hold(&ctx->completion_lock) |
47f46768 | 5776 | { |
78076bb6 | 5777 | struct hlist_head *list; |
47f46768 JA |
5778 | struct io_kiocb *req; |
5779 | ||
78076bb6 JA |
5780 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5781 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5782 | if (sqe_addr != req->user_data) |
5783 | continue; | |
9ba5fac8 PB |
5784 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5785 | continue; | |
b2cb805f | 5786 | return req; |
47f46768 | 5787 | } |
b2cb805f JA |
5788 | return NULL; |
5789 | } | |
5790 | ||
aa43477b PB |
5791 | static bool io_poll_disarm(struct io_kiocb *req) |
5792 | __must_hold(&ctx->completion_lock) | |
5793 | { | |
5794 | if (!io_poll_get_ownership(req)) | |
5795 | return false; | |
5796 | io_poll_remove_entries(req); | |
5797 | hash_del(&req->hash_node); | |
5798 | return true; | |
5799 | } | |
5800 | ||
9ba5fac8 PB |
5801 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5802 | bool poll_only) | |
e07785b0 | 5803 | __must_hold(&ctx->completion_lock) |
b2cb805f | 5804 | { |
aa43477b | 5805 | struct io_kiocb *req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f | 5806 | |
b2cb805f JA |
5807 | if (!req) |
5808 | return -ENOENT; | |
aa43477b PB |
5809 | io_poll_cancel_req(req); |
5810 | return 0; | |
47f46768 JA |
5811 | } |
5812 | ||
9096af3e PB |
5813 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5814 | unsigned int flags) | |
5815 | { | |
5816 | u32 events; | |
47f46768 | 5817 | |
9096af3e PB |
5818 | events = READ_ONCE(sqe->poll32_events); |
5819 | #ifdef __BIG_ENDIAN | |
5820 | events = swahw32(events); | |
5821 | #endif | |
5822 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5823 | events |= EPOLLONESHOT; | |
5824 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5825 | } |
5826 | ||
c5de0036 | 5827 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5828 | const struct io_uring_sqe *sqe) |
0969e783 | 5829 | { |
c5de0036 PB |
5830 | struct io_poll_update *upd = &req->poll_update; |
5831 | u32 flags; | |
5832 | ||
0969e783 JA |
5833 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5834 | return -EINVAL; | |
26578cda | 5835 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5836 | return -EINVAL; |
5837 | flags = READ_ONCE(sqe->len); | |
5838 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5839 | IORING_POLL_ADD_MULTI)) | |
5840 | return -EINVAL; | |
5841 | /* meaningless without update */ | |
5842 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5843 | return -EINVAL; |
5844 | ||
c5de0036 PB |
5845 | upd->old_user_data = READ_ONCE(sqe->addr); |
5846 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5847 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5848 | |
c5de0036 PB |
5849 | upd->new_user_data = READ_ONCE(sqe->off); |
5850 | if (!upd->update_user_data && upd->new_user_data) | |
5851 | return -EINVAL; | |
5852 | if (upd->update_events) | |
5853 | upd->events = io_poll_parse_events(sqe, flags); | |
5854 | else if (sqe->poll32_events) | |
5855 | return -EINVAL; | |
221c5eb2 | 5856 | |
221c5eb2 JA |
5857 | return 0; |
5858 | } | |
5859 | ||
3529d8c2 | 5860 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5861 | { |
5862 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5863 | u32 flags; |
221c5eb2 JA |
5864 | |
5865 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5866 | return -EINVAL; | |
c5de0036 | 5867 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5868 | return -EINVAL; |
5869 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5870 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 | 5871 | return -EINVAL; |
04c76b41 PB |
5872 | if ((flags & IORING_POLL_ADD_MULTI) && (req->flags & REQ_F_CQE_SKIP)) |
5873 | return -EINVAL; | |
221c5eb2 | 5874 | |
48dcd38d | 5875 | io_req_set_refcount(req); |
c5de0036 | 5876 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5877 | return 0; |
5878 | } | |
5879 | ||
61e98203 | 5880 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5881 | { |
5882 | struct io_poll_iocb *poll = &req->poll; | |
0969e783 | 5883 | struct io_poll_table ipt; |
aa43477b | 5884 | int ret; |
0969e783 | 5885 | |
d7718a9d | 5886 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5887 | |
aa43477b PB |
5888 | ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); |
5889 | ret = ret ?: ipt.error; | |
5890 | if (ret) | |
5891 | __io_req_complete(req, issue_flags, ret, 0); | |
5892 | return 0; | |
221c5eb2 JA |
5893 | } |
5894 | ||
c5de0036 | 5895 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5896 | { |
5897 | struct io_ring_ctx *ctx = req->ctx; | |
5898 | struct io_kiocb *preq; | |
2bbb146d | 5899 | int ret2, ret = 0; |
b69de288 | 5900 | |
79ebeaee | 5901 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5902 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
aa43477b | 5903 | if (!preq || !io_poll_disarm(preq)) { |
2bbb146d | 5904 | spin_unlock(&ctx->completion_lock); |
aa43477b | 5905 | ret = preq ? -EALREADY : -ENOENT; |
2bbb146d | 5906 | goto out; |
c5de0036 | 5907 | } |
79ebeaee | 5908 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5909 | |
2bbb146d PB |
5910 | if (req->poll_update.update_events || req->poll_update.update_user_data) { |
5911 | /* only mask one event flags, keep behavior flags */ | |
5912 | if (req->poll_update.update_events) { | |
5913 | preq->poll.events &= ~0xffff; | |
5914 | preq->poll.events |= req->poll_update.events & 0xffff; | |
5915 | preq->poll.events |= IO_POLL_UNMASK; | |
cb3b200e | 5916 | } |
2bbb146d PB |
5917 | if (req->poll_update.update_user_data) |
5918 | preq->user_data = req->poll_update.new_user_data; | |
5919 | ||
5920 | ret2 = io_poll_add(preq, issue_flags); | |
5921 | /* successfully updated, don't complete poll request */ | |
5922 | if (!ret2) | |
5923 | goto out; | |
b69de288 | 5924 | } |
2bbb146d PB |
5925 | req_set_fail(preq); |
5926 | io_req_complete(preq, -ECANCELED); | |
5927 | out: | |
5928 | if (ret < 0) | |
5929 | req_set_fail(req); | |
5930 | /* complete update request, we're done with it */ | |
5931 | io_req_complete(req, ret); | |
b69de288 JA |
5932 | return 0; |
5933 | } | |
5934 | ||
5262f567 JA |
5935 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5936 | { | |
ad8a48ac JA |
5937 | struct io_timeout_data *data = container_of(timer, |
5938 | struct io_timeout_data, timer); | |
5939 | struct io_kiocb *req = data->req; | |
5940 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5941 | unsigned long flags; |
5942 | ||
89850fce | 5943 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5944 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5945 | atomic_set(&req->ctx->cq_timeouts, |
5946 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5947 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5948 | |
a90c8bf6 PB |
5949 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) |
5950 | req_set_fail(req); | |
5951 | ||
5952 | req->result = -ETIME; | |
5953 | req->io_task_work.func = io_req_task_complete; | |
4813c377 | 5954 | io_req_task_work_add(req, false); |
5262f567 JA |
5955 | return HRTIMER_NORESTART; |
5956 | } | |
5957 | ||
fbd15848 PB |
5958 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5959 | __u64 user_data) | |
89850fce | 5960 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5961 | { |
fbd15848 | 5962 | struct io_timeout_data *io; |
47f46768 | 5963 | struct io_kiocb *req; |
fd9c7bc5 | 5964 | bool found = false; |
f254ac04 | 5965 | |
135fcde8 | 5966 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5967 | found = user_data == req->user_data; |
5968 | if (found) | |
47f46768 | 5969 | break; |
47f46768 | 5970 | } |
fd9c7bc5 PB |
5971 | if (!found) |
5972 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5973 | |
5974 | io = req->async_data; | |
fd9c7bc5 | 5975 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5976 | return ERR_PTR(-EALREADY); |
a71976f3 | 5977 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5978 | return req; |
5979 | } | |
47f46768 | 5980 | |
fbd15848 | 5981 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 5982 | __must_hold(&ctx->completion_lock) |
89850fce | 5983 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
5984 | { |
5985 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5986 | ||
5987 | if (IS_ERR(req)) | |
5988 | return PTR_ERR(req); | |
f254ac04 | 5989 | |
93d2bcd2 | 5990 | req_set_fail(req); |
913a571a | 5991 | io_fill_cqe_req(req, -ECANCELED, 0); |
91c2f697 | 5992 | io_put_req_deferred(req); |
f254ac04 JA |
5993 | return 0; |
5994 | } | |
5995 | ||
50c1df2b JA |
5996 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
5997 | { | |
5998 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
5999 | case IORING_TIMEOUT_BOOTTIME: | |
6000 | return CLOCK_BOOTTIME; | |
6001 | case IORING_TIMEOUT_REALTIME: | |
6002 | return CLOCK_REALTIME; | |
6003 | default: | |
6004 | /* can't happen, vetted at prep time */ | |
6005 | WARN_ON_ONCE(1); | |
6006 | fallthrough; | |
6007 | case 0: | |
6008 | return CLOCK_MONOTONIC; | |
6009 | } | |
6010 | } | |
6011 | ||
f1042b6c PB |
6012 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6013 | struct timespec64 *ts, enum hrtimer_mode mode) | |
6014 | __must_hold(&ctx->timeout_lock) | |
6015 | { | |
6016 | struct io_timeout_data *io; | |
6017 | struct io_kiocb *req; | |
6018 | bool found = false; | |
6019 | ||
6020 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
6021 | found = user_data == req->user_data; | |
6022 | if (found) | |
6023 | break; | |
6024 | } | |
6025 | if (!found) | |
6026 | return -ENOENT; | |
6027 | ||
6028 | io = req->async_data; | |
6029 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
6030 | return -EALREADY; | |
6031 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
6032 | io->timer.function = io_link_timeout_fn; | |
6033 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
6034 | return 0; | |
6035 | } | |
6036 | ||
9c8e11b3 PB |
6037 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6038 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 6039 | __must_hold(&ctx->timeout_lock) |
47f46768 | 6040 | { |
9c8e11b3 PB |
6041 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
6042 | struct io_timeout_data *data; | |
47f46768 | 6043 | |
9c8e11b3 PB |
6044 | if (IS_ERR(req)) |
6045 | return PTR_ERR(req); | |
47f46768 | 6046 | |
9c8e11b3 PB |
6047 | req->timeout.off = 0; /* noseq */ |
6048 | data = req->async_data; | |
6049 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6050 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6051 | data->timer.function = io_timeout_fn; |
6052 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6053 | return 0; | |
47f46768 JA |
6054 | } |
6055 | ||
3529d8c2 JA |
6056 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6057 | const struct io_uring_sqe *sqe) | |
b29472ee | 6058 | { |
9c8e11b3 PB |
6059 | struct io_timeout_rem *tr = &req->timeout_rem; |
6060 | ||
b29472ee JA |
6061 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6062 | return -EINVAL; | |
61710e43 DA |
6063 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6064 | return -EINVAL; | |
26578cda | 6065 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6066 | return -EINVAL; |
6067 | ||
f1042b6c | 6068 | tr->ltimeout = false; |
9c8e11b3 PB |
6069 | tr->addr = READ_ONCE(sqe->addr); |
6070 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6071 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6072 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6073 | return -EINVAL; | |
6074 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6075 | tr->ltimeout = true; | |
6076 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6077 | return -EINVAL; |
6078 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6079 | return -EFAULT; | |
2087009c YB |
6080 | if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) |
6081 | return -EINVAL; | |
9c8e11b3 PB |
6082 | } else if (tr->flags) { |
6083 | /* timeout removal doesn't support flags */ | |
b29472ee | 6084 | return -EINVAL; |
9c8e11b3 | 6085 | } |
b29472ee | 6086 | |
b29472ee JA |
6087 | return 0; |
6088 | } | |
6089 | ||
8662daec PB |
6090 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6091 | { | |
6092 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6093 | : HRTIMER_MODE_REL; | |
6094 | } | |
6095 | ||
11365043 JA |
6096 | /* |
6097 | * Remove or update an existing timeout command | |
6098 | */ | |
61e98203 | 6099 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6100 | { |
9c8e11b3 | 6101 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6102 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6103 | int ret; |
11365043 | 6104 | |
ec3c3d0f PB |
6105 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6106 | spin_lock(&ctx->completion_lock); | |
6107 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6108 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6109 | spin_unlock_irq(&ctx->timeout_lock); |
6110 | spin_unlock(&ctx->completion_lock); | |
6111 | } else { | |
f1042b6c PB |
6112 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6113 | ||
ec3c3d0f | 6114 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6115 | if (tr->ltimeout) |
6116 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6117 | else | |
6118 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6119 | spin_unlock_irq(&ctx->timeout_lock); |
6120 | } | |
11365043 | 6121 | |
4e88d6e7 | 6122 | if (ret < 0) |
93d2bcd2 | 6123 | req_set_fail(req); |
505657bc | 6124 | io_req_complete_post(req, ret, 0); |
11365043 | 6125 | return 0; |
5262f567 JA |
6126 | } |
6127 | ||
3529d8c2 | 6128 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6129 | bool is_timeout_link) |
5262f567 | 6130 | { |
ad8a48ac | 6131 | struct io_timeout_data *data; |
a41525ab | 6132 | unsigned flags; |
56080b02 | 6133 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6134 | |
ad8a48ac | 6135 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6136 | return -EINVAL; |
26578cda PB |
6137 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6138 | sqe->splice_fd_in) | |
a41525ab | 6139 | return -EINVAL; |
56080b02 | 6140 | if (off && is_timeout_link) |
2d28390a | 6141 | return -EINVAL; |
a41525ab | 6142 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
6143 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
6144 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
6145 | return -EINVAL; |
6146 | /* more than one clock specified is invalid, obviously */ | |
6147 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6148 | return -EINVAL; |
bdf20073 | 6149 | |
ef9dd637 | 6150 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6151 | req->timeout.off = off; |
f18ee4cf PB |
6152 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6153 | req->ctx->off_timeout_used = true; | |
26a61679 | 6154 | |
d6a644a7 PB |
6155 | if (WARN_ON_ONCE(req_has_async_data(req))) |
6156 | return -EFAULT; | |
6157 | if (io_alloc_async_data(req)) | |
26a61679 JA |
6158 | return -ENOMEM; |
6159 | ||
e8c2bc1f | 6160 | data = req->async_data; |
ad8a48ac | 6161 | data->req = req; |
50c1df2b | 6162 | data->flags = flags; |
ad8a48ac JA |
6163 | |
6164 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6165 | return -EFAULT; |
6166 | ||
8662daec | 6167 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6168 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6169 | |
6170 | if (is_timeout_link) { | |
6171 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6172 | ||
6173 | if (!link->head) | |
6174 | return -EINVAL; | |
6175 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6176 | return -EINVAL; | |
4d13d1a4 PB |
6177 | req->timeout.head = link->last; |
6178 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6179 | } |
ad8a48ac JA |
6180 | return 0; |
6181 | } | |
6182 | ||
61e98203 | 6183 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6184 | { |
ad8a48ac | 6185 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6186 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6187 | struct list_head *entry; |
bfe68a22 | 6188 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6189 | |
89850fce | 6190 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6191 | |
5262f567 JA |
6192 | /* |
6193 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6194 | * timeout event to be satisfied. If it isn't set, then this is |
6195 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6196 | */ |
8eb7e2d0 | 6197 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6198 | entry = ctx->timeout_list.prev; |
6199 | goto add; | |
6200 | } | |
5262f567 | 6201 | |
bfe68a22 PB |
6202 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6203 | req->timeout.target_seq = tail + off; | |
5262f567 | 6204 | |
f010505b MDG |
6205 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6206 | * This is safe because ->completion_lock is held, and submissions | |
6207 | * and completions are never mixed in the same ->completion_lock section. | |
6208 | */ | |
6209 | ctx->cq_last_tm_flush = tail; | |
6210 | ||
5262f567 JA |
6211 | /* |
6212 | * Insertion sort, ensuring the first entry in the list is always | |
6213 | * the one we need first. | |
6214 | */ | |
5262f567 | 6215 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6216 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6217 | timeout.list); | |
5262f567 | 6218 | |
8eb7e2d0 | 6219 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6220 | continue; |
bfe68a22 PB |
6221 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6222 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6223 | break; |
6224 | } | |
93bd25bb | 6225 | add: |
135fcde8 | 6226 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6227 | data->timer.function = io_timeout_fn; |
6228 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6229 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6230 | return 0; |
6231 | } | |
5262f567 | 6232 | |
f458dd84 PB |
6233 | struct io_cancel_data { |
6234 | struct io_ring_ctx *ctx; | |
6235 | u64 user_data; | |
6236 | }; | |
6237 | ||
62755e35 JA |
6238 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6239 | { | |
6240 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6241 | struct io_cancel_data *cd = data; |
62755e35 | 6242 | |
f458dd84 | 6243 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6244 | } |
6245 | ||
f458dd84 PB |
6246 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6247 | struct io_ring_ctx *ctx) | |
62755e35 | 6248 | { |
f458dd84 | 6249 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6250 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6251 | int ret = 0; |
6252 | ||
f458dd84 | 6253 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6254 | return -ENOENT; |
6255 | ||
f458dd84 | 6256 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6257 | switch (cancel_ret) { |
6258 | case IO_WQ_CANCEL_OK: | |
6259 | ret = 0; | |
6260 | break; | |
6261 | case IO_WQ_CANCEL_RUNNING: | |
6262 | ret = -EALREADY; | |
6263 | break; | |
6264 | case IO_WQ_CANCEL_NOTFOUND: | |
6265 | ret = -ENOENT; | |
6266 | break; | |
6267 | } | |
6268 | ||
e977d6d3 JA |
6269 | return ret; |
6270 | } | |
6271 | ||
8cb01fac | 6272 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6273 | { |
8cb01fac | 6274 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6275 | int ret; |
6276 | ||
dadebc35 | 6277 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6278 | |
f458dd84 | 6279 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6280 | if (ret != -ENOENT) |
8cb01fac | 6281 | return ret; |
505657bc PB |
6282 | |
6283 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6284 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6285 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6286 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6287 | if (ret != -ENOENT) |
505657bc PB |
6288 | goto out; |
6289 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6290 | out: | |
6291 | spin_unlock(&ctx->completion_lock); | |
6292 | return ret; | |
47f46768 JA |
6293 | } |
6294 | ||
3529d8c2 JA |
6295 | static int io_async_cancel_prep(struct io_kiocb *req, |
6296 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6297 | { |
fbf23849 | 6298 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6299 | return -EINVAL; |
61710e43 DA |
6300 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6301 | return -EINVAL; | |
26578cda PB |
6302 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6303 | sqe->splice_fd_in) | |
e977d6d3 JA |
6304 | return -EINVAL; |
6305 | ||
fbf23849 JA |
6306 | req->cancel.addr = READ_ONCE(sqe->addr); |
6307 | return 0; | |
6308 | } | |
6309 | ||
61e98203 | 6310 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6311 | { |
6312 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 | 6313 | u64 sqe_addr = req->cancel.addr; |
3b44b371 | 6314 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
58f99373 PB |
6315 | struct io_tctx_node *node; |
6316 | int ret; | |
6317 | ||
8cb01fac | 6318 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6319 | if (ret != -ENOENT) |
6320 | goto done; | |
58f99373 PB |
6321 | |
6322 | /* slow path, try all io-wq's */ | |
3b44b371 | 6323 | io_ring_submit_lock(ctx, needs_lock); |
58f99373 PB |
6324 | ret = -ENOENT; |
6325 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6326 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6327 | |
58f99373 PB |
6328 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6329 | if (ret != -ENOENT) | |
6330 | break; | |
6331 | } | |
3b44b371 | 6332 | io_ring_submit_unlock(ctx, needs_lock); |
58f99373 | 6333 | done: |
58f99373 | 6334 | if (ret < 0) |
93d2bcd2 | 6335 | req_set_fail(req); |
505657bc | 6336 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6337 | return 0; |
6338 | } | |
6339 | ||
269bbe5f | 6340 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6341 | const struct io_uring_sqe *sqe) |
6342 | { | |
61710e43 DA |
6343 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6344 | return -EINVAL; | |
26578cda | 6345 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6346 | return -EINVAL; |
6347 | ||
269bbe5f BM |
6348 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6349 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6350 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6351 | return -EINVAL; |
269bbe5f | 6352 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6353 | return 0; |
6354 | } | |
6355 | ||
889fca73 | 6356 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6357 | { |
6358 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 6359 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
c3bdad02 | 6360 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6361 | int ret; |
fbf23849 | 6362 | |
269bbe5f BM |
6363 | up.offset = req->rsrc_update.offset; |
6364 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6365 | up.nr = 0; |
6366 | up.tags = 0; | |
615cee49 | 6367 | up.resv = 0; |
05f3fb3c | 6368 | |
3b44b371 | 6369 | io_ring_submit_lock(ctx, needs_lock); |
fdecb662 | 6370 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6371 | &up, req->rsrc_update.nr_args); |
3b44b371 | 6372 | io_ring_submit_unlock(ctx, needs_lock); |
05f3fb3c JA |
6373 | |
6374 | if (ret < 0) | |
93d2bcd2 | 6375 | req_set_fail(req); |
889fca73 | 6376 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6377 | return 0; |
6378 | } | |
6379 | ||
bfe76559 | 6380 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6381 | { |
d625c6ee | 6382 | switch (req->opcode) { |
e781573e | 6383 | case IORING_OP_NOP: |
bfe76559 | 6384 | return 0; |
f67676d1 JA |
6385 | case IORING_OP_READV: |
6386 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6387 | case IORING_OP_READ: |
bfe76559 | 6388 | return io_read_prep(req, sqe); |
f67676d1 JA |
6389 | case IORING_OP_WRITEV: |
6390 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6391 | case IORING_OP_WRITE: |
bfe76559 | 6392 | return io_write_prep(req, sqe); |
0969e783 | 6393 | case IORING_OP_POLL_ADD: |
bfe76559 | 6394 | return io_poll_add_prep(req, sqe); |
0969e783 | 6395 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6396 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6397 | case IORING_OP_FSYNC: |
1155c76a | 6398 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6399 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6400 | return io_sfr_prep(req, sqe); |
03b1230c | 6401 | case IORING_OP_SENDMSG: |
fddaface | 6402 | case IORING_OP_SEND: |
bfe76559 | 6403 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6404 | case IORING_OP_RECVMSG: |
fddaface | 6405 | case IORING_OP_RECV: |
bfe76559 | 6406 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6407 | case IORING_OP_CONNECT: |
bfe76559 | 6408 | return io_connect_prep(req, sqe); |
2d28390a | 6409 | case IORING_OP_TIMEOUT: |
bfe76559 | 6410 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6411 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6412 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6413 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6414 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6415 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6416 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6417 | case IORING_OP_ACCEPT: |
bfe76559 | 6418 | return io_accept_prep(req, sqe); |
d63d1b5e | 6419 | case IORING_OP_FALLOCATE: |
bfe76559 | 6420 | return io_fallocate_prep(req, sqe); |
15b71abe | 6421 | case IORING_OP_OPENAT: |
bfe76559 | 6422 | return io_openat_prep(req, sqe); |
b5dba59e | 6423 | case IORING_OP_CLOSE: |
bfe76559 | 6424 | return io_close_prep(req, sqe); |
05f3fb3c | 6425 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6426 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6427 | case IORING_OP_STATX: |
bfe76559 | 6428 | return io_statx_prep(req, sqe); |
4840e418 | 6429 | case IORING_OP_FADVISE: |
bfe76559 | 6430 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6431 | case IORING_OP_MADVISE: |
bfe76559 | 6432 | return io_madvise_prep(req, sqe); |
cebdb986 | 6433 | case IORING_OP_OPENAT2: |
bfe76559 | 6434 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6435 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6436 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6437 | case IORING_OP_SPLICE: |
bfe76559 | 6438 | return io_splice_prep(req, sqe); |
ddf0322d | 6439 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6440 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6441 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6442 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6443 | case IORING_OP_TEE: |
bfe76559 | 6444 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6445 | case IORING_OP_SHUTDOWN: |
6446 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6447 | case IORING_OP_RENAMEAT: |
6448 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6449 | case IORING_OP_UNLINKAT: |
6450 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6451 | case IORING_OP_MKDIRAT: |
6452 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6453 | case IORING_OP_SYMLINKAT: |
6454 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6455 | case IORING_OP_LINKAT: |
6456 | return io_linkat_prep(req, sqe); | |
f67676d1 JA |
6457 | } |
6458 | ||
bfe76559 PB |
6459 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6460 | req->opcode); | |
bd54b6fe | 6461 | return -EINVAL; |
bfe76559 PB |
6462 | } |
6463 | ||
93642ef8 | 6464 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6465 | { |
b7e298d2 PB |
6466 | if (!io_op_defs[req->opcode].needs_async_setup) |
6467 | return 0; | |
d886e185 | 6468 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
6469 | return -EFAULT; |
6470 | if (io_alloc_async_data(req)) | |
6471 | return -EAGAIN; | |
6472 | ||
93642ef8 PB |
6473 | switch (req->opcode) { |
6474 | case IORING_OP_READV: | |
93642ef8 PB |
6475 | return io_rw_prep_async(req, READ); |
6476 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6477 | return io_rw_prep_async(req, WRITE); |
6478 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6479 | return io_sendmsg_prep_async(req); |
6480 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6481 | return io_recvmsg_prep_async(req); |
6482 | case IORING_OP_CONNECT: | |
6483 | return io_connect_prep_async(req); | |
6484 | } | |
b7e298d2 PB |
6485 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6486 | req->opcode); | |
6487 | return -EFAULT; | |
f67676d1 JA |
6488 | } |
6489 | ||
9cf7c104 PB |
6490 | static u32 io_get_sequence(struct io_kiocb *req) |
6491 | { | |
a3dbdf54 | 6492 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6493 | |
a3dbdf54 PB |
6494 | /* need original cached_sq_head, but it was increased for each req */ |
6495 | io_for_each_link(req, req) | |
6496 | seq--; | |
6497 | return seq; | |
9cf7c104 PB |
6498 | } |
6499 | ||
c072481d | 6500 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 6501 | { |
a197f664 | 6502 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6503 | struct io_defer_entry *de; |
f67676d1 | 6504 | int ret; |
e0eb71dc | 6505 | u32 seq = io_get_sequence(req); |
3c19966d | 6506 | |
9d858b21 | 6507 | /* Still need defer if there is pending req in defer list. */ |
e302f104 | 6508 | spin_lock(&ctx->completion_lock); |
5e371265 | 6509 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e302f104 | 6510 | spin_unlock(&ctx->completion_lock); |
e0eb71dc | 6511 | queue: |
10c66904 | 6512 | ctx->drain_active = false; |
e0eb71dc PB |
6513 | io_req_task_queue(req); |
6514 | return; | |
10c66904 | 6515 | } |
e302f104 | 6516 | spin_unlock(&ctx->completion_lock); |
9cf7c104 | 6517 | |
b7e298d2 | 6518 | ret = io_req_prep_async(req); |
e0eb71dc PB |
6519 | if (ret) { |
6520 | fail: | |
6521 | io_req_complete_failed(req, ret); | |
6522 | return; | |
6523 | } | |
cbdcb435 | 6524 | io_prep_async_link(req); |
27dc8338 | 6525 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6526 | if (!de) { |
1b48773f | 6527 | ret = -ENOMEM; |
e0eb71dc | 6528 | goto fail; |
76cc33d7 | 6529 | } |
2d28390a | 6530 | |
79ebeaee | 6531 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6532 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6533 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6534 | kfree(de); |
e0eb71dc | 6535 | goto queue; |
de0617e4 JA |
6536 | } |
6537 | ||
915967f6 | 6538 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6539 | de->req = req; |
9cf7c104 | 6540 | de->seq = seq; |
27dc8338 | 6541 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6542 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
6543 | } |
6544 | ||
68fb8979 | 6545 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6546 | { |
d1fd1c20 PB |
6547 | if (req->flags & REQ_F_BUFFER_SELECTED) |
6548 | io_put_kbuf(req); | |
99bc4c38 | 6549 | |
0e1b6fe3 PB |
6550 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6551 | switch (req->opcode) { | |
6552 | case IORING_OP_READV: | |
6553 | case IORING_OP_READ_FIXED: | |
6554 | case IORING_OP_READ: | |
6555 | case IORING_OP_WRITEV: | |
6556 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6557 | case IORING_OP_WRITE: { |
6558 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6559 | |
6560 | kfree(io->free_iovec); | |
0e1b6fe3 | 6561 | break; |
e8c2bc1f | 6562 | } |
0e1b6fe3 | 6563 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6564 | case IORING_OP_SENDMSG: { |
6565 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6566 | |
6567 | kfree(io->free_iov); | |
0e1b6fe3 | 6568 | break; |
e8c2bc1f | 6569 | } |
0e1b6fe3 PB |
6570 | case IORING_OP_SPLICE: |
6571 | case IORING_OP_TEE: | |
e1d767f0 PB |
6572 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6573 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6574 | break; |
f3cd4850 JA |
6575 | case IORING_OP_OPENAT: |
6576 | case IORING_OP_OPENAT2: | |
6577 | if (req->open.filename) | |
6578 | putname(req->open.filename); | |
6579 | break; | |
80a261fd JA |
6580 | case IORING_OP_RENAMEAT: |
6581 | putname(req->rename.oldpath); | |
6582 | putname(req->rename.newpath); | |
6583 | break; | |
14a1143b JA |
6584 | case IORING_OP_UNLINKAT: |
6585 | putname(req->unlink.filename); | |
6586 | break; | |
e34a02dc DK |
6587 | case IORING_OP_MKDIRAT: |
6588 | putname(req->mkdir.filename); | |
6589 | break; | |
7a8721f8 DK |
6590 | case IORING_OP_SYMLINKAT: |
6591 | putname(req->symlink.oldpath); | |
6592 | putname(req->symlink.newpath); | |
6593 | break; | |
cf30da90 DK |
6594 | case IORING_OP_LINKAT: |
6595 | putname(req->hardlink.oldpath); | |
6596 | putname(req->hardlink.newpath); | |
6597 | break; | |
0e1b6fe3 | 6598 | } |
99bc4c38 | 6599 | } |
75652a30 JA |
6600 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6601 | kfree(req->apoll->double_poll); | |
6602 | kfree(req->apoll); | |
6603 | req->apoll = NULL; | |
6604 | } | |
3a0a6902 PB |
6605 | if (req->flags & REQ_F_INFLIGHT) { |
6606 | struct io_uring_task *tctx = req->task->io_uring; | |
6607 | ||
6608 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6609 | } |
c854357b | 6610 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6611 | put_cred(req->creds); |
d886e185 PB |
6612 | if (req->flags & REQ_F_ASYNC_DATA) { |
6613 | kfree(req->async_data); | |
6614 | req->async_data = NULL; | |
6615 | } | |
c854357b | 6616 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
6617 | } |
6618 | ||
889fca73 | 6619 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6620 | { |
5730b27e | 6621 | const struct cred *creds = NULL; |
d625c6ee | 6622 | int ret; |
2b188cc1 | 6623 | |
6878b40e | 6624 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 6625 | creds = override_creds(req->creds); |
5730b27e | 6626 | |
5bd2182d PM |
6627 | if (!io_op_defs[req->opcode].audit_skip) |
6628 | audit_uring_entry(req->opcode); | |
6629 | ||
d625c6ee | 6630 | switch (req->opcode) { |
2b188cc1 | 6631 | case IORING_OP_NOP: |
889fca73 | 6632 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6633 | break; |
6634 | case IORING_OP_READV: | |
edafccee | 6635 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6636 | case IORING_OP_READ: |
889fca73 | 6637 | ret = io_read(req, issue_flags); |
edafccee | 6638 | break; |
3529d8c2 | 6639 | case IORING_OP_WRITEV: |
edafccee | 6640 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6641 | case IORING_OP_WRITE: |
889fca73 | 6642 | ret = io_write(req, issue_flags); |
2b188cc1 | 6643 | break; |
c992fe29 | 6644 | case IORING_OP_FSYNC: |
45d189c6 | 6645 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6646 | break; |
221c5eb2 | 6647 | case IORING_OP_POLL_ADD: |
61e98203 | 6648 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6649 | break; |
6650 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6651 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6652 | break; |
5d17b4a4 | 6653 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6654 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6655 | break; |
0fa03c62 | 6656 | case IORING_OP_SENDMSG: |
889fca73 | 6657 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6658 | break; |
fddaface | 6659 | case IORING_OP_SEND: |
889fca73 | 6660 | ret = io_send(req, issue_flags); |
0fa03c62 | 6661 | break; |
aa1fa28f | 6662 | case IORING_OP_RECVMSG: |
889fca73 | 6663 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6664 | break; |
fddaface | 6665 | case IORING_OP_RECV: |
889fca73 | 6666 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6667 | break; |
5262f567 | 6668 | case IORING_OP_TIMEOUT: |
61e98203 | 6669 | ret = io_timeout(req, issue_flags); |
5262f567 | 6670 | break; |
11365043 | 6671 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6672 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6673 | break; |
17f2fe35 | 6674 | case IORING_OP_ACCEPT: |
889fca73 | 6675 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6676 | break; |
f8e85cf2 | 6677 | case IORING_OP_CONNECT: |
889fca73 | 6678 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6679 | break; |
62755e35 | 6680 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6681 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6682 | break; |
d63d1b5e | 6683 | case IORING_OP_FALLOCATE: |
45d189c6 | 6684 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6685 | break; |
15b71abe | 6686 | case IORING_OP_OPENAT: |
45d189c6 | 6687 | ret = io_openat(req, issue_flags); |
15b71abe | 6688 | break; |
b5dba59e | 6689 | case IORING_OP_CLOSE: |
889fca73 | 6690 | ret = io_close(req, issue_flags); |
b5dba59e | 6691 | break; |
05f3fb3c | 6692 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6693 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6694 | break; |
eddc7ef5 | 6695 | case IORING_OP_STATX: |
45d189c6 | 6696 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6697 | break; |
4840e418 | 6698 | case IORING_OP_FADVISE: |
45d189c6 | 6699 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6700 | break; |
c1ca757b | 6701 | case IORING_OP_MADVISE: |
45d189c6 | 6702 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6703 | break; |
cebdb986 | 6704 | case IORING_OP_OPENAT2: |
45d189c6 | 6705 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6706 | break; |
3e4827b0 | 6707 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6708 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6709 | break; |
7d67af2c | 6710 | case IORING_OP_SPLICE: |
45d189c6 | 6711 | ret = io_splice(req, issue_flags); |
7d67af2c | 6712 | break; |
ddf0322d | 6713 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6714 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6715 | break; |
067524e9 | 6716 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6717 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6718 | break; |
f2a8d5c7 | 6719 | case IORING_OP_TEE: |
45d189c6 | 6720 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6721 | break; |
36f4fa68 | 6722 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6723 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6724 | break; |
80a261fd | 6725 | case IORING_OP_RENAMEAT: |
45d189c6 | 6726 | ret = io_renameat(req, issue_flags); |
80a261fd | 6727 | break; |
14a1143b | 6728 | case IORING_OP_UNLINKAT: |
45d189c6 | 6729 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6730 | break; |
e34a02dc DK |
6731 | case IORING_OP_MKDIRAT: |
6732 | ret = io_mkdirat(req, issue_flags); | |
6733 | break; | |
7a8721f8 DK |
6734 | case IORING_OP_SYMLINKAT: |
6735 | ret = io_symlinkat(req, issue_flags); | |
6736 | break; | |
cf30da90 DK |
6737 | case IORING_OP_LINKAT: |
6738 | ret = io_linkat(req, issue_flags); | |
6739 | break; | |
2b188cc1 JA |
6740 | default: |
6741 | ret = -EINVAL; | |
6742 | break; | |
6743 | } | |
6744 | ||
5bd2182d PM |
6745 | if (!io_op_defs[req->opcode].audit_skip) |
6746 | audit_uring_exit(!ret, ret); | |
6747 | ||
5730b27e JA |
6748 | if (creds) |
6749 | revert_creds(creds); | |
def596e9 JA |
6750 | if (ret) |
6751 | return ret; | |
b532576e | 6752 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 6753 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 6754 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
6755 | |
6756 | return 0; | |
2b188cc1 JA |
6757 | } |
6758 | ||
ebc11b6c PB |
6759 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6760 | { | |
6761 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6762 | ||
6763 | req = io_put_req_find_next(req); | |
6764 | return req ? &req->work : NULL; | |
6765 | } | |
6766 | ||
5280f7e5 | 6767 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6768 | { |
6769 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
d01905db PB |
6770 | unsigned int issue_flags = IO_URING_F_UNLOCKED; |
6771 | bool needs_poll = false; | |
6df1db6b | 6772 | struct io_kiocb *timeout; |
561fb04a | 6773 | int ret = 0; |
2b188cc1 | 6774 | |
48dcd38d PB |
6775 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6776 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6777 | __io_req_set_refcount(req, 2); | |
6778 | else | |
6779 | req_ref_get(req); | |
5d5901a3 | 6780 | |
6df1db6b PB |
6781 | timeout = io_prep_linked_timeout(req); |
6782 | if (timeout) | |
6783 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6784 | |
dadebc35 | 6785 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
d01905db PB |
6786 | if (work->flags & IO_WQ_WORK_CANCEL) { |
6787 | io_req_task_queue_fail(req, -ECANCELED); | |
6788 | return; | |
6789 | } | |
31b51510 | 6790 | |
d01905db | 6791 | if (req->flags & REQ_F_FORCE_ASYNC) { |
afb7f56f PB |
6792 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
6793 | bool opcode_poll = def->pollin || def->pollout; | |
6794 | ||
6795 | if (opcode_poll && file_can_poll(req->file)) { | |
6796 | needs_poll = true; | |
d01905db | 6797 | issue_flags |= IO_URING_F_NONBLOCK; |
afb7f56f | 6798 | } |
561fb04a | 6799 | } |
31b51510 | 6800 | |
d01905db PB |
6801 | do { |
6802 | ret = io_issue_sqe(req, issue_flags); | |
6803 | if (ret != -EAGAIN) | |
6804 | break; | |
6805 | /* | |
6806 | * We can get EAGAIN for iopolled IO even though we're | |
6807 | * forcing a sync submission from here, since we can't | |
6808 | * wait for request slots on the block side. | |
6809 | */ | |
6810 | if (!needs_poll) { | |
6811 | cond_resched(); | |
6812 | continue; | |
90fa0288 HX |
6813 | } |
6814 | ||
d01905db PB |
6815 | if (io_arm_poll_handler(req) == IO_APOLL_OK) |
6816 | return; | |
6817 | /* aborted or ready, in either case retry blocking */ | |
6818 | needs_poll = false; | |
6819 | issue_flags &= ~IO_URING_F_NONBLOCK; | |
6820 | } while (1); | |
31b51510 | 6821 | |
a3df7698 | 6822 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6823 | if (ret) |
a3df7698 | 6824 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6825 | } |
6826 | ||
aeca241b | 6827 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6828 | unsigned i) |
65e19f54 | 6829 | { |
042b0d85 | 6830 | return &table->files[i]; |
dafecf19 PB |
6831 | } |
6832 | ||
65e19f54 JA |
6833 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6834 | int index) | |
6835 | { | |
aeca241b | 6836 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6837 | |
a04b0ac0 | 6838 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6839 | } |
6840 | ||
a04b0ac0 | 6841 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6842 | { |
6843 | unsigned long file_ptr = (unsigned long) file; | |
6844 | ||
88459b50 | 6845 | file_ptr |= io_file_get_flags(file); |
a04b0ac0 | 6846 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6847 | } |
6848 | ||
ac177053 PB |
6849 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6850 | struct io_kiocb *req, int fd) | |
09bb8394 | 6851 | { |
8da11c19 | 6852 | struct file *file; |
ac177053 | 6853 | unsigned long file_ptr; |
09bb8394 | 6854 | |
ac177053 PB |
6855 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6856 | return NULL; | |
6857 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6858 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6859 | file = (struct file *) (file_ptr & FFS_MASK); | |
6860 | file_ptr &= ~FFS_MASK; | |
6861 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 6862 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
a46be971 | 6863 | io_req_set_rsrc_node(req, ctx); |
ac177053 PB |
6864 | return file; |
6865 | } | |
d44f554e | 6866 | |
ac177053 | 6867 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6868 | struct io_kiocb *req, int fd) |
6869 | { | |
62906e89 | 6870 | struct file *file = fget(fd); |
ac177053 PB |
6871 | |
6872 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6873 | |
ac177053 PB |
6874 | /* we don't allow fixed io_uring files */ |
6875 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6876 | io_req_track_inflight(req); | |
8371adf5 | 6877 | return file; |
09bb8394 JA |
6878 | } |
6879 | ||
ac177053 | 6880 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6881 | struct io_kiocb *req, int fd, bool fixed) |
6882 | { | |
6883 | if (fixed) | |
6884 | return io_file_get_fixed(ctx, req, fd); | |
6885 | else | |
62906e89 | 6886 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6887 | } |
6888 | ||
f237c30a | 6889 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6890 | { |
6891 | struct io_kiocb *prev = req->timeout.prev; | |
8cb01fac | 6892 | int ret; |
89b263f6 JA |
6893 | |
6894 | if (prev) { | |
8cb01fac | 6895 | ret = io_try_cancel_userdata(req, prev->user_data); |
505657bc | 6896 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6897 | io_put_req(prev); |
89b263f6 JA |
6898 | } else { |
6899 | io_req_complete_post(req, -ETIME, 0); | |
6900 | } | |
6901 | } | |
6902 | ||
2665abfd | 6903 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6904 | { |
ad8a48ac JA |
6905 | struct io_timeout_data *data = container_of(timer, |
6906 | struct io_timeout_data, timer); | |
90cd7e42 | 6907 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6908 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6909 | unsigned long flags; |
2665abfd | 6910 | |
89b263f6 | 6911 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6912 | prev = req->timeout.head; |
6913 | req->timeout.head = NULL; | |
2665abfd JA |
6914 | |
6915 | /* | |
6916 | * We don't expect the list to be empty, that will only happen if we | |
6917 | * race with the completion of the linked work. | |
6918 | */ | |
447c19f3 | 6919 | if (prev) { |
f2f87370 | 6920 | io_remove_next_linked(prev); |
447c19f3 PB |
6921 | if (!req_ref_inc_not_zero(prev)) |
6922 | prev = NULL; | |
6923 | } | |
ef9dd637 | 6924 | list_del(&req->timeout.list); |
89b263f6 JA |
6925 | req->timeout.prev = prev; |
6926 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6927 | |
89b263f6 | 6928 | req->io_task_work.func = io_req_task_link_timeout; |
4813c377 | 6929 | io_req_task_work_add(req, false); |
2665abfd JA |
6930 | return HRTIMER_NORESTART; |
6931 | } | |
6932 | ||
de968c18 | 6933 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6934 | { |
de968c18 PB |
6935 | struct io_ring_ctx *ctx = req->ctx; |
6936 | ||
89b263f6 | 6937 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6938 | /* |
f2f87370 PB |
6939 | * If the back reference is NULL, then our linked request finished |
6940 | * before we got a chance to setup the timer | |
76a46e06 | 6941 | */ |
90cd7e42 | 6942 | if (req->timeout.head) { |
e8c2bc1f | 6943 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6944 | |
ad8a48ac JA |
6945 | data->timer.function = io_link_timeout_fn; |
6946 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6947 | data->mode); | |
ef9dd637 | 6948 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6949 | } |
89b263f6 | 6950 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6951 | /* drop submission reference */ |
76a46e06 JA |
6952 | io_put_req(req); |
6953 | } | |
2665abfd | 6954 | |
d475a9a6 PB |
6955 | static void io_queue_sqe_arm_apoll(struct io_kiocb *req) |
6956 | __must_hold(&req->ctx->uring_lock) | |
6957 | { | |
6958 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); | |
6959 | ||
6960 | switch (io_arm_poll_handler(req)) { | |
6961 | case IO_APOLL_READY: | |
d475a9a6 PB |
6962 | io_req_task_queue(req); |
6963 | break; | |
6964 | case IO_APOLL_ABORTED: | |
6965 | /* | |
6966 | * Queued up for async execution, worker will release | |
6967 | * submit reference when the iocb is actually submitted. | |
6968 | */ | |
6969 | io_queue_async_work(req, NULL); | |
6970 | break; | |
6971 | } | |
6972 | ||
6973 | if (linked_timeout) | |
6974 | io_queue_linked_timeout(linked_timeout); | |
6975 | } | |
6976 | ||
6977 | static inline void __io_queue_sqe(struct io_kiocb *req) | |
282cdc86 | 6978 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6979 | { |
906c6caa | 6980 | struct io_kiocb *linked_timeout; |
e0c5c576 | 6981 | int ret; |
2b188cc1 | 6982 | |
c5eef2b9 | 6983 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6984 | |
fff4e40e PB |
6985 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
6986 | io_req_add_compl_list(req); | |
d9f9d284 | 6987 | return; |
fff4e40e | 6988 | } |
491381ce JA |
6989 | /* |
6990 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6991 | * doesn't support non-blocking read/write attempts | |
6992 | */ | |
1840038e | 6993 | if (likely(!ret)) { |
906c6caa PB |
6994 | linked_timeout = io_prep_linked_timeout(req); |
6995 | if (linked_timeout) | |
6996 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 6997 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d475a9a6 | 6998 | io_queue_sqe_arm_apoll(req); |
0d63c148 | 6999 | } else { |
f41db273 | 7000 | io_req_complete_failed(req, ret); |
9e645e11 | 7001 | } |
2b188cc1 JA |
7002 | } |
7003 | ||
4652fe3f | 7004 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 7005 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 7006 | { |
4652fe3f | 7007 | if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 7008 | io_req_complete_fail_submit(req); |
e0eb71dc PB |
7009 | } else if (unlikely(req->ctx->drain_active)) { |
7010 | io_drain_req(req); | |
76cc33d7 PB |
7011 | } else { |
7012 | int ret = io_req_prep_async(req); | |
7013 | ||
7014 | if (unlikely(ret)) | |
7015 | io_req_complete_failed(req, ret); | |
7016 | else | |
f237c30a | 7017 | io_queue_async_work(req, NULL); |
ce35a47a | 7018 | } |
4fe2c963 JL |
7019 | } |
7020 | ||
4652fe3f PB |
7021 | static inline void io_queue_sqe(struct io_kiocb *req) |
7022 | __must_hold(&req->ctx->uring_lock) | |
7023 | { | |
7024 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) | |
7025 | __io_queue_sqe(req); | |
7026 | else | |
7027 | io_queue_sqe_fallback(req); | |
7028 | } | |
7029 | ||
b16fed66 PB |
7030 | /* |
7031 | * Check SQE restrictions (opcode and flags). | |
7032 | * | |
7033 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
7034 | */ | |
7035 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
7036 | struct io_kiocb *req, | |
7037 | unsigned int sqe_flags) | |
4fe2c963 | 7038 | { |
b16fed66 PB |
7039 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
7040 | return false; | |
7041 | ||
7042 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
7043 | ctx->restrictions.sqe_flags_required) | |
7044 | return false; | |
7045 | ||
7046 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
7047 | ctx->restrictions.sqe_flags_required)) | |
7048 | return false; | |
7049 | ||
7050 | return true; | |
4fe2c963 JL |
7051 | } |
7052 | ||
22b2ca31 PB |
7053 | static void io_init_req_drain(struct io_kiocb *req) |
7054 | { | |
7055 | struct io_ring_ctx *ctx = req->ctx; | |
7056 | struct io_kiocb *head = ctx->submit_state.link.head; | |
7057 | ||
7058 | ctx->drain_active = true; | |
7059 | if (head) { | |
7060 | /* | |
7061 | * If we need to drain a request in the middle of a link, drain | |
7062 | * the head request and the next request/link after the current | |
7063 | * link. Considering sequential execution of links, | |
b6c7db32 | 7064 | * REQ_F_IO_DRAIN will be maintained for every request of our |
22b2ca31 PB |
7065 | * link. |
7066 | */ | |
b6c7db32 | 7067 | head->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
22b2ca31 PB |
7068 | ctx->drain_next = true; |
7069 | } | |
7070 | } | |
7071 | ||
b16fed66 PB |
7072 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7073 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7074 | __must_hold(&ctx->uring_lock) |
b16fed66 | 7075 | { |
b16fed66 | 7076 | unsigned int sqe_flags; |
fc0ae024 | 7077 | int personality; |
4a04d1d1 | 7078 | u8 opcode; |
b16fed66 | 7079 | |
864ea921 | 7080 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 7081 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
7082 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
7083 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7084 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7085 | req->file = NULL; |
b16fed66 | 7086 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7087 | req->task = current; |
b16fed66 | 7088 | |
4a04d1d1 PB |
7089 | if (unlikely(opcode >= IORING_OP_LAST)) { |
7090 | req->opcode = 0; | |
b16fed66 | 7091 | return -EINVAL; |
4a04d1d1 | 7092 | } |
68fe256a PB |
7093 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
7094 | /* enforce forwards compatibility on users */ | |
7095 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
7096 | return -EINVAL; | |
7097 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
4a04d1d1 | 7098 | !io_op_defs[opcode].buffer_select) |
68fe256a | 7099 | return -EOPNOTSUPP; |
5562a8d7 PB |
7100 | if (sqe_flags & IOSQE_CQE_SKIP_SUCCESS) |
7101 | ctx->drain_disabled = true; | |
7102 | if (sqe_flags & IOSQE_IO_DRAIN) { | |
7103 | if (ctx->drain_disabled) | |
7104 | return -EOPNOTSUPP; | |
22b2ca31 | 7105 | io_init_req_drain(req); |
5562a8d7 | 7106 | } |
2a56a9bd PB |
7107 | } |
7108 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
7109 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
7110 | return -EACCES; | |
7111 | /* knock it to the slow queue path, will be drained there */ | |
7112 | if (ctx->drain_active) | |
7113 | req->flags |= REQ_F_FORCE_ASYNC; | |
7114 | /* if there is no link, we're at "next" request and need to drain */ | |
7115 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
7116 | ctx->drain_next = false; | |
7117 | ctx->drain_active = true; | |
b6c7db32 | 7118 | req->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 7119 | } |
68fe256a | 7120 | } |
b16fed66 | 7121 | |
4a04d1d1 | 7122 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
7123 | struct io_submit_state *state = &ctx->submit_state; |
7124 | ||
7125 | /* | |
7126 | * Plug now if we have more than 2 IO left after this, and the | |
7127 | * target is potentially a read/write to block based storage. | |
7128 | */ | |
4a04d1d1 | 7129 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
7130 | state->plug_started = true; |
7131 | state->need_plug = false; | |
5ca7a8b3 | 7132 | blk_start_plug_nr_ios(&state->plug, state->submit_nr); |
6d63416d PB |
7133 | } |
7134 | ||
62906e89 | 7135 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 7136 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 | 7137 | if (unlikely(!req->file)) |
fc0ae024 | 7138 | return -EBADF; |
b16fed66 | 7139 | } |
863e0560 | 7140 | |
003e8dcc JA |
7141 | personality = READ_ONCE(sqe->personality); |
7142 | if (personality) { | |
cdab10bf LT |
7143 | int ret; |
7144 | ||
c10d1f98 PB |
7145 | req->creds = xa_load(&ctx->personalities, personality); |
7146 | if (!req->creds) | |
003e8dcc | 7147 | return -EINVAL; |
c10d1f98 | 7148 | get_cred(req->creds); |
cdc1404a PM |
7149 | ret = security_uring_override_creds(req->creds); |
7150 | if (ret) { | |
7151 | put_cred(req->creds); | |
7152 | return ret; | |
7153 | } | |
b8e64b53 | 7154 | req->flags |= REQ_F_CREDS; |
003e8dcc | 7155 | } |
b16fed66 | 7156 | |
fc0ae024 | 7157 | return io_req_prep(req, sqe); |
b16fed66 PB |
7158 | } |
7159 | ||
a6b8cadc | 7160 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7161 | const struct io_uring_sqe *sqe) |
282cdc86 | 7162 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7163 | { |
a1ab7b35 | 7164 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7165 | int ret; |
9e645e11 | 7166 | |
a6b8cadc PB |
7167 | ret = io_init_req(ctx, req, sqe); |
7168 | if (unlikely(ret)) { | |
a87acfde JA |
7169 | trace_io_uring_req_failed(sqe, ret); |
7170 | ||
a8295b98 | 7171 | /* fail even hard links since we don't submit */ |
de59bc10 | 7172 | if (link->head) { |
a8295b98 HX |
7173 | /* |
7174 | * we can judge a link req is failed or cancelled by if | |
7175 | * REQ_F_FAIL is set, but the head is an exception since | |
7176 | * it may be set REQ_F_FAIL because of other req's failure | |
7177 | * so let's leverage req->result to distinguish if a head | |
7178 | * is set REQ_F_FAIL because of its failure or other req's | |
7179 | * failure so that we can set the correct ret code for it. | |
7180 | * init result here to avoid affecting the normal path. | |
7181 | */ | |
7182 | if (!(link->head->flags & REQ_F_FAIL)) | |
7183 | req_fail_link_node(link->head, -ECANCELED); | |
7184 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7185 | /* | |
7186 | * the current req is a normal req, we should return | |
7187 | * error and thus break the submittion loop. | |
7188 | */ | |
7189 | io_req_complete_failed(req, ret); | |
7190 | return ret; | |
de59bc10 | 7191 | } |
a8295b98 | 7192 | req_fail_link_node(req, ret); |
a6b8cadc | 7193 | } |
441b8a78 | 7194 | |
be7053b7 | 7195 | /* don't need @sqe from now on */ |
236daeae OL |
7196 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
7197 | req->flags, true, | |
7198 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7199 | |
9e645e11 JA |
7200 | /* |
7201 | * If we already have a head request, queue this one for async | |
7202 | * submittal once the head completes. If we don't have a head but | |
7203 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7204 | * submitted sync once the chain is complete. If none of those | |
7205 | * conditions are true (normal request), then just queue it. | |
7206 | */ | |
863e0560 PB |
7207 | if (link->head) { |
7208 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7209 | |
a8295b98 HX |
7210 | if (!(req->flags & REQ_F_FAIL)) { |
7211 | ret = io_req_prep_async(req); | |
7212 | if (unlikely(ret)) { | |
7213 | req_fail_link_node(req, ret); | |
7214 | if (!(head->flags & REQ_F_FAIL)) | |
7215 | req_fail_link_node(head, -ECANCELED); | |
7216 | } | |
7217 | } | |
9d76377f | 7218 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7219 | link->last->link = req; |
863e0560 | 7220 | link->last = req; |
32fe525b | 7221 | |
f15a3431 PB |
7222 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) |
7223 | return 0; | |
32fe525b | 7224 | /* last request of a link, enqueue the link */ |
f15a3431 PB |
7225 | link->head = NULL; |
7226 | req = head; | |
7227 | } else if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { | |
7228 | link->head = req; | |
7229 | link->last = req; | |
7230 | return 0; | |
9e645e11 | 7231 | } |
2e6e1fde | 7232 | |
f15a3431 | 7233 | io_queue_sqe(req); |
1d4240cc | 7234 | return 0; |
9e645e11 JA |
7235 | } |
7236 | ||
9a56a232 JA |
7237 | /* |
7238 | * Batched submission is done, ensure local IO is flushed out. | |
7239 | */ | |
553deffd | 7240 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 7241 | { |
553deffd PB |
7242 | struct io_submit_state *state = &ctx->submit_state; |
7243 | ||
a1ab7b35 | 7244 | if (state->link.head) |
de59bc10 | 7245 | io_queue_sqe(state->link.head); |
553deffd | 7246 | /* flush only after queuing links as they can generate completions */ |
c450178d | 7247 | io_submit_flush_completions(ctx); |
27926b68 JA |
7248 | if (state->plug_started) |
7249 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7250 | } |
7251 | ||
7252 | /* | |
7253 | * Start submission side cache. | |
7254 | */ | |
7255 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7256 | unsigned int max_ios) |
9a56a232 | 7257 | { |
27926b68 | 7258 | state->plug_started = false; |
4b628aeb | 7259 | state->need_plug = max_ios > 2; |
5ca7a8b3 | 7260 | state->submit_nr = max_ios; |
a1ab7b35 PB |
7261 | /* set only head, no need to init link_last in advance */ |
7262 | state->link.head = NULL; | |
9a56a232 JA |
7263 | } |
7264 | ||
2b188cc1 JA |
7265 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7266 | { | |
75b28aff | 7267 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7268 | |
caf582c6 PB |
7269 | /* |
7270 | * Ensure any loads from the SQEs are done at this point, | |
7271 | * since once we write the new head, the application could | |
7272 | * write new data to them. | |
7273 | */ | |
7274 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7275 | } |
7276 | ||
2b188cc1 | 7277 | /* |
dd9ae8a0 | 7278 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7279 | * that is mapped by userspace. This means that care needs to be taken to |
7280 | * ensure that reads are stable, as we cannot rely on userspace always | |
7281 | * being a good citizen. If members of the sqe are validated and then later | |
7282 | * used, it's important that those reads are done through READ_ONCE() to | |
7283 | * prevent a re-load down the line. | |
7284 | */ | |
709b302f | 7285 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7286 | { |
ea5ab3b5 | 7287 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7288 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7289 | |
7290 | /* | |
7291 | * The cached sq head (or cq tail) serves two purposes: | |
7292 | * | |
7293 | * 1) allows us to batch the cost of updating the user visible | |
7294 | * head updates. | |
7295 | * 2) allows the kernel side to track the head on its own, even | |
7296 | * though the application is the one updating it. | |
7297 | */ | |
17d3aeb3 | 7298 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7299 | if (likely(head < ctx->sq_entries)) |
7300 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7301 | |
7302 | /* drop invalid entries */ | |
15641e42 PB |
7303 | ctx->cq_extra--; |
7304 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7305 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7306 | return NULL; |
7307 | } | |
7308 | ||
0f212204 | 7309 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7310 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7311 | { |
69629809 | 7312 | unsigned int entries = io_sqring_entries(ctx); |
46c4e16a | 7313 | int submitted = 0; |
6c271ce2 | 7314 | |
51d48dab | 7315 | if (unlikely(!entries)) |
69629809 | 7316 | return 0; |
ee7d46d9 | 7317 | /* make sure SQ entry isn't read before tail */ |
69629809 | 7318 | nr = min3(nr, ctx->sq_entries, entries); |
9a10867a | 7319 | io_get_task_refs(nr); |
6c271ce2 | 7320 | |
ba88ff11 | 7321 | io_submit_state_start(&ctx->submit_state, nr); |
69629809 | 7322 | do { |
3529d8c2 | 7323 | const struct io_uring_sqe *sqe; |
196be95c | 7324 | struct io_kiocb *req; |
fb5ccc98 | 7325 | |
a33ae9ce | 7326 | if (unlikely(!io_alloc_req_refill(ctx))) { |
196be95c PB |
7327 | if (!submitted) |
7328 | submitted = -EAGAIN; | |
fb5ccc98 | 7329 | break; |
196be95c | 7330 | } |
a33ae9ce | 7331 | req = io_alloc_req(ctx); |
4fccfcbb PB |
7332 | sqe = io_get_sqe(ctx); |
7333 | if (unlikely(!sqe)) { | |
c2b6c6bc | 7334 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
4fccfcbb PB |
7335 | break; |
7336 | } | |
d3656344 JA |
7337 | /* will complete beyond this point, count as submitted */ |
7338 | submitted++; | |
a1ab7b35 | 7339 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7340 | break; |
69629809 | 7341 | } while (submitted < nr); |
6c271ce2 | 7342 | |
9466f437 PB |
7343 | if (unlikely(submitted != nr)) { |
7344 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7345 | int unused = nr - ref_used; |
9466f437 | 7346 | |
09899b19 | 7347 | current->io_uring->cached_refs += unused; |
9466f437 | 7348 | } |
6c271ce2 | 7349 | |
553deffd | 7350 | io_submit_state_end(ctx); |
ae9428ca PB |
7351 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7352 | io_commit_sqring(ctx); | |
7353 | ||
6c271ce2 JA |
7354 | return submitted; |
7355 | } | |
7356 | ||
e4b6d902 PB |
7357 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7358 | { | |
7359 | return READ_ONCE(sqd->state); | |
7360 | } | |
7361 | ||
23b3628e XW |
7362 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7363 | { | |
7364 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7365 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7366 | WRITE_ONCE(ctx->rings->sq_flags, |
7367 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7368 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7369 | } |
7370 | ||
7371 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7372 | { | |
79ebeaee | 7373 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7374 | WRITE_ONCE(ctx->rings->sq_flags, |
7375 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7376 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7377 | } |
7378 | ||
08369246 | 7379 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7380 | { |
c8d1ba58 | 7381 | unsigned int to_submit; |
bdcd3eab | 7382 | int ret = 0; |
6c271ce2 | 7383 | |
c8d1ba58 | 7384 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7385 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7386 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7387 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7388 | |
5eef4e87 | 7389 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
7390 | const struct cred *creds = NULL; |
7391 | ||
7392 | if (ctx->sq_creds != current_cred()) | |
7393 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7394 | |
c8d1ba58 | 7395 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 7396 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 7397 | io_do_iopoll(ctx, true); |
906a3c6f | 7398 | |
3b763ba1 PB |
7399 | /* |
7400 | * Don't submit if refs are dying, good for io_uring_register(), | |
7401 | * but also it is relied upon by io_ring_exit_work() | |
7402 | */ | |
0298ef96 PB |
7403 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7404 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7405 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7406 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7407 | |
acfb381d PB |
7408 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7409 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7410 | if (creds) |
7411 | revert_creds(creds); | |
acfb381d | 7412 | } |
6c271ce2 | 7413 | |
08369246 XW |
7414 | return ret; |
7415 | } | |
6c271ce2 | 7416 | |
c072481d | 7417 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
7418 | { |
7419 | struct io_ring_ctx *ctx; | |
7420 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7421 | |
c9dca27d PB |
7422 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7423 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7424 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7425 | } |
6c271ce2 | 7426 | |
e4b6d902 PB |
7427 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7428 | { | |
7429 | bool did_sig = false; | |
7430 | struct ksignal ksig; | |
7431 | ||
7432 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7433 | signal_pending(current)) { | |
7434 | mutex_unlock(&sqd->lock); | |
7435 | if (signal_pending(current)) | |
7436 | did_sig = get_signal(&ksig); | |
7437 | cond_resched(); | |
7438 | mutex_lock(&sqd->lock); | |
7439 | } | |
e4b6d902 PB |
7440 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7441 | } | |
7442 | ||
c8d1ba58 JA |
7443 | static int io_sq_thread(void *data) |
7444 | { | |
69fb2131 JA |
7445 | struct io_sq_data *sqd = data; |
7446 | struct io_ring_ctx *ctx; | |
a0d9205f | 7447 | unsigned long timeout = 0; |
37d1e2e3 | 7448 | char buf[TASK_COMM_LEN]; |
08369246 | 7449 | DEFINE_WAIT(wait); |
6c271ce2 | 7450 | |
696ee88a | 7451 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7452 | set_task_comm(current, buf); |
37d1e2e3 JA |
7453 | |
7454 | if (sqd->sq_cpu != -1) | |
7455 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7456 | else | |
7457 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7458 | current->flags |= PF_NO_SETAFFINITY; | |
7459 | ||
5bd2182d PM |
7460 | audit_alloc_kernel(current); |
7461 | ||
09a6f4ef | 7462 | mutex_lock(&sqd->lock); |
e4b6d902 | 7463 | while (1) { |
1a924a80 | 7464 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7465 | |
e4b6d902 PB |
7466 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7467 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7468 | break; |
08369246 XW |
7469 | timeout = jiffies + sqd->sq_thread_idle; |
7470 | } | |
e4b6d902 | 7471 | |
e95eee2d | 7472 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7473 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7474 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7475 | |
5eef4e87 | 7476 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 7477 | sqt_spin = true; |
69fb2131 | 7478 | } |
dd432ea5 PB |
7479 | if (io_run_task_work()) |
7480 | sqt_spin = true; | |
6c271ce2 | 7481 | |
08369246 | 7482 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7483 | cond_resched(); |
08369246 XW |
7484 | if (sqt_spin) |
7485 | timeout = jiffies + sqd->sq_thread_idle; | |
7486 | continue; | |
7487 | } | |
7488 | ||
08369246 | 7489 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7490 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7491 | bool needs_sched = true; |
7492 | ||
724cb4f9 | 7493 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7494 | io_ring_set_wakeup_flag(ctx); |
7495 | ||
724cb4f9 | 7496 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 7497 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
7498 | needs_sched = false; |
7499 | break; | |
7500 | } | |
7501 | if (io_sqring_entries(ctx)) { | |
7502 | needs_sched = false; | |
7503 | break; | |
7504 | } | |
7505 | } | |
7506 | ||
7507 | if (needs_sched) { | |
7508 | mutex_unlock(&sqd->lock); | |
7509 | schedule(); | |
7510 | mutex_lock(&sqd->lock); | |
7511 | } | |
69fb2131 JA |
7512 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7513 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7514 | } |
08369246 XW |
7515 | |
7516 | finish_wait(&sqd->wait, &wait); | |
7517 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7518 | } |
28cea78a | 7519 | |
78cc687b | 7520 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7521 | sqd->thread = NULL; |
05962f95 | 7522 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7523 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7524 | io_run_task_work(); |
734551df PB |
7525 | mutex_unlock(&sqd->lock); |
7526 | ||
5bd2182d PM |
7527 | audit_free(current); |
7528 | ||
37d1e2e3 JA |
7529 | complete(&sqd->exited); |
7530 | do_exit(0); | |
6c271ce2 JA |
7531 | } |
7532 | ||
bda52162 JA |
7533 | struct io_wait_queue { |
7534 | struct wait_queue_entry wq; | |
7535 | struct io_ring_ctx *ctx; | |
5fd46178 | 7536 | unsigned cq_tail; |
bda52162 JA |
7537 | unsigned nr_timeouts; |
7538 | }; | |
7539 | ||
6c503150 | 7540 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7541 | { |
7542 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7543 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7544 | |
7545 | /* | |
d195a66e | 7546 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7547 | * started waiting. For timeouts, we always want to return to userspace, |
7548 | * regardless of event count. | |
7549 | */ | |
5fd46178 | 7550 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7551 | } |
7552 | ||
7553 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7554 | int wake_flags, void *key) | |
7555 | { | |
7556 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7557 | wq); | |
7558 | ||
6c503150 PB |
7559 | /* |
7560 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7561 | * the task, and the next invocation will do it. | |
7562 | */ | |
5ed7a37d | 7563 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7564 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7565 | return -1; | |
bda52162 JA |
7566 | } |
7567 | ||
af9c1a44 JA |
7568 | static int io_run_task_work_sig(void) |
7569 | { | |
7570 | if (io_run_task_work()) | |
7571 | return 1; | |
7572 | if (!signal_pending(current)) | |
7573 | return 0; | |
0b8cfa97 | 7574 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7575 | return -ERESTARTSYS; |
af9c1a44 JA |
7576 | return -EINTR; |
7577 | } | |
7578 | ||
eeb60b9a PB |
7579 | /* when returns >0, the caller should retry */ |
7580 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7581 | struct io_wait_queue *iowq, | |
7582 | signed long *timeout) | |
7583 | { | |
7584 | int ret; | |
7585 | ||
7586 | /* make sure we run task_work before checking for signals */ | |
7587 | ret = io_run_task_work_sig(); | |
7588 | if (ret || io_should_wake(iowq)) | |
7589 | return ret; | |
7590 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7591 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7592 | return 1; |
7593 | ||
7594 | *timeout = schedule_timeout(*timeout); | |
7595 | return !*timeout ? -ETIME : 1; | |
7596 | } | |
7597 | ||
2b188cc1 JA |
7598 | /* |
7599 | * Wait until events become available, if we don't already have some. The | |
7600 | * application must reap them itself, as they reside on the shared cq ring. | |
7601 | */ | |
7602 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7603 | const sigset_t __user *sig, size_t sigsz, |
7604 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7605 | { |
90291099 | 7606 | struct io_wait_queue iowq; |
75b28aff | 7607 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7608 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7609 | int ret; | |
2b188cc1 | 7610 | |
b41e9852 | 7611 | do { |
90f67366 | 7612 | io_cqring_overflow_flush(ctx); |
6c503150 | 7613 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7614 | return 0; |
4c6e277c | 7615 | if (!io_run_task_work()) |
b41e9852 | 7616 | break; |
b41e9852 | 7617 | } while (1); |
2b188cc1 | 7618 | |
44df58d4 XW |
7619 | if (uts) { |
7620 | struct timespec64 ts; | |
7621 | ||
7622 | if (get_timespec64(&ts, uts)) | |
7623 | return -EFAULT; | |
7624 | timeout = timespec64_to_jiffies(&ts); | |
7625 | } | |
7626 | ||
2b188cc1 | 7627 | if (sig) { |
9e75ad5d AB |
7628 | #ifdef CONFIG_COMPAT |
7629 | if (in_compat_syscall()) | |
7630 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7631 | sigsz); |
9e75ad5d AB |
7632 | else |
7633 | #endif | |
b772434b | 7634 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7635 | |
2b188cc1 JA |
7636 | if (ret) |
7637 | return ret; | |
7638 | } | |
7639 | ||
90291099 PB |
7640 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7641 | iowq.wq.private = current; | |
7642 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7643 | iowq.ctx = ctx; | |
bda52162 | 7644 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7645 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7646 | |
c826bd7a | 7647 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7648 | do { |
ca0a2651 | 7649 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7650 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7651 | ret = -EBUSY; |
7652 | break; | |
7653 | } | |
311997b3 | 7654 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7655 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7656 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7657 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7658 | cond_resched(); |
eeb60b9a | 7659 | } while (ret > 0); |
bda52162 | 7660 | |
b7db41c9 | 7661 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7662 | |
75b28aff | 7663 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7664 | } |
7665 | ||
9123c8ff | 7666 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7667 | { |
9123c8ff | 7668 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7669 | |
846a4ef2 | 7670 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7671 | kfree(table[i]); |
7672 | kfree(table); | |
7673 | } | |
7674 | ||
c072481d | 7675 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
7676 | { |
7677 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7678 | size_t init_size = size; | |
7679 | void **table; | |
7680 | ||
0bea96f5 | 7681 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7682 | if (!table) |
7683 | return NULL; | |
7684 | ||
7685 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7686 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7687 | |
0bea96f5 | 7688 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7689 | if (!table[i]) { |
7690 | io_free_page_table(table, init_size); | |
7691 | return NULL; | |
7692 | } | |
7693 | size -= this_size; | |
7694 | } | |
7695 | return table; | |
05f3fb3c JA |
7696 | } |
7697 | ||
28a9fe25 | 7698 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7699 | { |
28a9fe25 PB |
7700 | percpu_ref_exit(&ref_node->refs); |
7701 | kfree(ref_node); | |
1642b445 PB |
7702 | } |
7703 | ||
c072481d | 7704 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
7705 | { |
7706 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7707 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7708 | unsigned long flags; | |
7709 | bool first_add = false; | |
7710 | ||
7711 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7712 | node->done = true; | |
7713 | ||
7714 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7715 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7716 | struct io_rsrc_node, node); | |
7717 | /* recycle ref nodes in order */ | |
7718 | if (!node->done) | |
7719 | break; | |
7720 | list_del(&node->node); | |
7721 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7722 | } | |
7723 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7724 | ||
7725 | if (first_add) | |
7726 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7727 | } | |
7728 | ||
7729 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7730 | { | |
7731 | struct io_rsrc_node *ref_node; | |
7732 | ||
7733 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7734 | if (!ref_node) | |
7735 | return NULL; | |
7736 | ||
7737 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7738 | 0, GFP_KERNEL)) { | |
7739 | kfree(ref_node); | |
7740 | return NULL; | |
7741 | } | |
7742 | INIT_LIST_HEAD(&ref_node->node); | |
7743 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7744 | ref_node->done = false; | |
7745 | return ref_node; | |
7746 | } | |
7747 | ||
a7f0ed5a PB |
7748 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7749 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 7750 | __must_hold(&ctx->uring_lock) |
6b06314c | 7751 | { |
a7f0ed5a PB |
7752 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7753 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7754 | |
ab409402 PB |
7755 | io_rsrc_refs_drop(ctx); |
7756 | ||
a7f0ed5a PB |
7757 | if (data_to_kill) { |
7758 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7759 | |
a7f0ed5a | 7760 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7761 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7762 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7763 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7764 | |
3e942498 | 7765 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7766 | percpu_ref_kill(&rsrc_node->refs); |
7767 | ctx->rsrc_node = NULL; | |
7768 | } | |
6b06314c | 7769 | |
a7f0ed5a PB |
7770 | if (!ctx->rsrc_node) { |
7771 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7772 | ctx->rsrc_backup_node = NULL; | |
7773 | } | |
8bad28d8 HX |
7774 | } |
7775 | ||
a7f0ed5a | 7776 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7777 | { |
7778 | if (ctx->rsrc_backup_node) | |
7779 | return 0; | |
b895c9a6 | 7780 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7781 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7782 | } |
7783 | ||
c072481d PB |
7784 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
7785 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
7786 | { |
7787 | int ret; | |
05589553 | 7788 | |
215c3902 | 7789 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7790 | if (data->quiesce) |
7791 | return -ENXIO; | |
05589553 | 7792 | |
8bad28d8 | 7793 | data->quiesce = true; |
1ffc5422 | 7794 | do { |
a7f0ed5a | 7795 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7796 | if (ret) |
f2303b1f | 7797 | break; |
a7f0ed5a | 7798 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7799 | |
3e942498 PB |
7800 | /* kill initial ref, already quiesced if zero */ |
7801 | if (atomic_dec_and_test(&data->refs)) | |
7802 | break; | |
c018db4a | 7803 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7804 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7805 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7806 | if (!ret) { |
7807 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7808 | break; |
c018db4a | 7809 | } |
8bad28d8 | 7810 | |
3e942498 PB |
7811 | atomic_inc(&data->refs); |
7812 | /* wait for all works potentially completing data->done */ | |
7813 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7814 | reinit_completion(&data->done); |
8dd03afe | 7815 | |
1ffc5422 | 7816 | ret = io_run_task_work_sig(); |
8bad28d8 | 7817 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7818 | } while (ret >= 0); |
8bad28d8 | 7819 | data->quiesce = false; |
05f3fb3c | 7820 | |
8bad28d8 | 7821 | return ret; |
d7954b2b BM |
7822 | } |
7823 | ||
2d091d62 PB |
7824 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7825 | { | |
7826 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7827 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7828 | ||
7829 | return &data->tags[table_idx][off]; | |
7830 | } | |
7831 | ||
44b31f2f | 7832 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7833 | { |
2d091d62 PB |
7834 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7835 | ||
7836 | if (data->tags) | |
7837 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7838 | kfree(data); |
7839 | } | |
7840 | ||
c072481d PB |
7841 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7842 | u64 __user *utags, unsigned nr, | |
7843 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7844 | { |
b895c9a6 | 7845 | struct io_rsrc_data *data; |
2d091d62 | 7846 | int ret = -ENOMEM; |
d878c816 | 7847 | unsigned i; |
1ad555c6 BM |
7848 | |
7849 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7850 | if (!data) | |
d878c816 | 7851 | return -ENOMEM; |
2d091d62 | 7852 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7853 | if (!data->tags) { |
1ad555c6 | 7854 | kfree(data); |
d878c816 PB |
7855 | return -ENOMEM; |
7856 | } | |
2d091d62 PB |
7857 | |
7858 | data->nr = nr; | |
7859 | data->ctx = ctx; | |
7860 | data->do_put = do_put; | |
d878c816 | 7861 | if (utags) { |
2d091d62 | 7862 | ret = -EFAULT; |
d878c816 | 7863 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7864 | u64 *tag_slot = io_get_tag_slot(data, i); |
7865 | ||
7866 | if (copy_from_user(tag_slot, &utags[i], | |
7867 | sizeof(*tag_slot))) | |
2d091d62 | 7868 | goto fail; |
d878c816 | 7869 | } |
1ad555c6 | 7870 | } |
b60c8dce | 7871 | |
3e942498 | 7872 | atomic_set(&data->refs, 1); |
1ad555c6 | 7873 | init_completion(&data->done); |
d878c816 PB |
7874 | *pdata = data; |
7875 | return 0; | |
2d091d62 PB |
7876 | fail: |
7877 | io_rsrc_data_free(data); | |
7878 | return ret; | |
1ad555c6 BM |
7879 | } |
7880 | ||
9123c8ff PB |
7881 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7882 | { | |
0bea96f5 PB |
7883 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7884 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7885 | return !!table->files; |
7886 | } | |
7887 | ||
042b0d85 | 7888 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7889 | { |
042b0d85 | 7890 | kvfree(table->files); |
9123c8ff PB |
7891 | table->files = NULL; |
7892 | } | |
7893 | ||
fff4db76 | 7894 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7895 | { |
fff4db76 PB |
7896 | #if defined(CONFIG_UNIX) |
7897 | if (ctx->ring_sock) { | |
7898 | struct sock *sock = ctx->ring_sock->sk; | |
7899 | struct sk_buff *skb; | |
7900 | ||
7901 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7902 | kfree_skb(skb); | |
7903 | } | |
7904 | #else | |
7905 | int i; | |
7906 | ||
7907 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7908 | struct file *file; | |
7909 | ||
7910 | file = io_file_from_index(ctx, i); | |
7911 | if (file) | |
7912 | fput(file); | |
7913 | } | |
7914 | #endif | |
042b0d85 | 7915 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7916 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7917 | ctx->file_data = NULL; |
7918 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7919 | } |
7920 | ||
d7954b2b BM |
7921 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7922 | { | |
d7954b2b BM |
7923 | int ret; |
7924 | ||
08480400 | 7925 | if (!ctx->file_data) |
d7954b2b | 7926 | return -ENXIO; |
08480400 PB |
7927 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7928 | if (!ret) | |
7929 | __io_sqe_files_unregister(ctx); | |
7930 | return ret; | |
6b06314c JA |
7931 | } |
7932 | ||
37d1e2e3 | 7933 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7934 | __releases(&sqd->lock) |
37d1e2e3 | 7935 | { |
521d6a73 PB |
7936 | WARN_ON_ONCE(sqd->thread == current); |
7937 | ||
9e138a48 PB |
7938 | /* |
7939 | * Do the dance but not conditional clear_bit() because it'd race with | |
7940 | * other threads incrementing park_pending and setting the bit. | |
7941 | */ | |
37d1e2e3 | 7942 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7943 | if (atomic_dec_return(&sqd->park_pending)) |
7944 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7945 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7946 | } |
7947 | ||
86e0d676 | 7948 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7949 | __acquires(&sqd->lock) |
37d1e2e3 | 7950 | { |
521d6a73 PB |
7951 | WARN_ON_ONCE(sqd->thread == current); |
7952 | ||
9e138a48 | 7953 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7954 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7955 | mutex_lock(&sqd->lock); |
05962f95 | 7956 | if (sqd->thread) |
86e0d676 | 7957 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7958 | } |
7959 | ||
7960 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7961 | { | |
521d6a73 | 7962 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7963 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7964 | |
05962f95 | 7965 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7966 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7967 | if (sqd->thread) |
7968 | wake_up_process(sqd->thread); | |
09a6f4ef | 7969 | mutex_unlock(&sqd->lock); |
05962f95 | 7970 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7971 | } |
7972 | ||
534ca6d6 | 7973 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7974 | { |
534ca6d6 | 7975 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7976 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7977 | ||
37d1e2e3 JA |
7978 | io_sq_thread_stop(sqd); |
7979 | kfree(sqd); | |
7980 | } | |
7981 | } | |
7982 | ||
7983 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7984 | { | |
7985 | struct io_sq_data *sqd = ctx->sq_data; | |
7986 | ||
7987 | if (sqd) { | |
05962f95 | 7988 | io_sq_thread_park(sqd); |
521d6a73 | 7989 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7990 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7991 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7992 | |
7993 | io_put_sq_data(sqd); | |
7994 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7995 | } |
7996 | } | |
7997 | ||
aa06165d JA |
7998 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7999 | { | |
8000 | struct io_ring_ctx *ctx_attach; | |
8001 | struct io_sq_data *sqd; | |
8002 | struct fd f; | |
8003 | ||
8004 | f = fdget(p->wq_fd); | |
8005 | if (!f.file) | |
8006 | return ERR_PTR(-ENXIO); | |
8007 | if (f.file->f_op != &io_uring_fops) { | |
8008 | fdput(f); | |
8009 | return ERR_PTR(-EINVAL); | |
8010 | } | |
8011 | ||
8012 | ctx_attach = f.file->private_data; | |
8013 | sqd = ctx_attach->sq_data; | |
8014 | if (!sqd) { | |
8015 | fdput(f); | |
8016 | return ERR_PTR(-EINVAL); | |
8017 | } | |
5c2469e0 JA |
8018 | if (sqd->task_tgid != current->tgid) { |
8019 | fdput(f); | |
8020 | return ERR_PTR(-EPERM); | |
8021 | } | |
aa06165d JA |
8022 | |
8023 | refcount_inc(&sqd->refs); | |
8024 | fdput(f); | |
8025 | return sqd; | |
8026 | } | |
8027 | ||
26984fbf PB |
8028 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
8029 | bool *attached) | |
534ca6d6 JA |
8030 | { |
8031 | struct io_sq_data *sqd; | |
8032 | ||
26984fbf | 8033 | *attached = false; |
5c2469e0 JA |
8034 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
8035 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
8036 | if (!IS_ERR(sqd)) { |
8037 | *attached = true; | |
5c2469e0 | 8038 | return sqd; |
26984fbf | 8039 | } |
5c2469e0 JA |
8040 | /* fall through for EPERM case, setup new sqd/task */ |
8041 | if (PTR_ERR(sqd) != -EPERM) | |
8042 | return sqd; | |
8043 | } | |
aa06165d | 8044 | |
534ca6d6 JA |
8045 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
8046 | if (!sqd) | |
8047 | return ERR_PTR(-ENOMEM); | |
8048 | ||
9e138a48 | 8049 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 8050 | refcount_set(&sqd->refs, 1); |
69fb2131 | 8051 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 8052 | mutex_init(&sqd->lock); |
534ca6d6 | 8053 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 8054 | init_completion(&sqd->exited); |
534ca6d6 JA |
8055 | return sqd; |
8056 | } | |
8057 | ||
6b06314c | 8058 | #if defined(CONFIG_UNIX) |
6b06314c JA |
8059 | /* |
8060 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
8061 | * the io_uring can be safely unregistered on process exit, even if we have | |
8062 | * loops in the file referencing. | |
8063 | */ | |
8064 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
8065 | { | |
8066 | struct sock *sk = ctx->ring_sock->sk; | |
8067 | struct scm_fp_list *fpl; | |
8068 | struct sk_buff *skb; | |
08a45173 | 8069 | int i, nr_files; |
6b06314c | 8070 | |
6b06314c JA |
8071 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
8072 | if (!fpl) | |
8073 | return -ENOMEM; | |
8074 | ||
8075 | skb = alloc_skb(0, GFP_KERNEL); | |
8076 | if (!skb) { | |
8077 | kfree(fpl); | |
8078 | return -ENOMEM; | |
8079 | } | |
8080 | ||
8081 | skb->sk = sk; | |
6b06314c | 8082 | |
08a45173 | 8083 | nr_files = 0; |
62e398be | 8084 | fpl->user = get_uid(current_user()); |
6b06314c | 8085 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
8086 | struct file *file = io_file_from_index(ctx, i + offset); |
8087 | ||
8088 | if (!file) | |
08a45173 | 8089 | continue; |
65e19f54 | 8090 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
8091 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
8092 | nr_files++; | |
6b06314c JA |
8093 | } |
8094 | ||
08a45173 JA |
8095 | if (nr_files) { |
8096 | fpl->max = SCM_MAX_FD; | |
8097 | fpl->count = nr_files; | |
8098 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 8099 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
8100 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
8101 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8102 | |
08a45173 JA |
8103 | for (i = 0; i < nr_files; i++) |
8104 | fput(fpl->fp[i]); | |
8105 | } else { | |
8106 | kfree_skb(skb); | |
8107 | kfree(fpl); | |
8108 | } | |
6b06314c JA |
8109 | |
8110 | return 0; | |
8111 | } | |
8112 | ||
8113 | /* | |
8114 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8115 | * causes regular reference counting to break down. We rely on the UNIX | |
8116 | * garbage collection to take care of this problem for us. | |
8117 | */ | |
8118 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8119 | { | |
8120 | unsigned left, total; | |
8121 | int ret = 0; | |
8122 | ||
8123 | total = 0; | |
8124 | left = ctx->nr_user_files; | |
8125 | while (left) { | |
8126 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8127 | |
8128 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8129 | if (ret) | |
8130 | break; | |
8131 | left -= this_files; | |
8132 | total += this_files; | |
8133 | } | |
8134 | ||
8135 | if (!ret) | |
8136 | return 0; | |
8137 | ||
8138 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8139 | struct file *file = io_file_from_index(ctx, total); |
8140 | ||
8141 | if (file) | |
8142 | fput(file); | |
6b06314c JA |
8143 | total++; |
8144 | } | |
8145 | ||
8146 | return ret; | |
8147 | } | |
8148 | #else | |
8149 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8150 | { | |
8151 | return 0; | |
8152 | } | |
8153 | #endif | |
8154 | ||
47e90392 | 8155 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8156 | { |
50238531 | 8157 | struct file *file = prsrc->file; |
05f3fb3c JA |
8158 | #if defined(CONFIG_UNIX) |
8159 | struct sock *sock = ctx->ring_sock->sk; | |
8160 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8161 | struct sk_buff *skb; | |
8162 | int i; | |
8163 | ||
8164 | __skb_queue_head_init(&list); | |
8165 | ||
8166 | /* | |
8167 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8168 | * remove this entry and rearrange the file array. | |
8169 | */ | |
8170 | skb = skb_dequeue(head); | |
8171 | while (skb) { | |
8172 | struct scm_fp_list *fp; | |
8173 | ||
8174 | fp = UNIXCB(skb).fp; | |
8175 | for (i = 0; i < fp->count; i++) { | |
8176 | int left; | |
8177 | ||
8178 | if (fp->fp[i] != file) | |
8179 | continue; | |
8180 | ||
8181 | unix_notinflight(fp->user, fp->fp[i]); | |
8182 | left = fp->count - 1 - i; | |
8183 | if (left) { | |
8184 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8185 | left * sizeof(struct file *)); | |
8186 | } | |
8187 | fp->count--; | |
8188 | if (!fp->count) { | |
8189 | kfree_skb(skb); | |
8190 | skb = NULL; | |
8191 | } else { | |
8192 | __skb_queue_tail(&list, skb); | |
8193 | } | |
8194 | fput(file); | |
8195 | file = NULL; | |
8196 | break; | |
8197 | } | |
8198 | ||
8199 | if (!file) | |
8200 | break; | |
8201 | ||
8202 | __skb_queue_tail(&list, skb); | |
8203 | ||
8204 | skb = skb_dequeue(head); | |
8205 | } | |
8206 | ||
8207 | if (skb_peek(&list)) { | |
8208 | spin_lock_irq(&head->lock); | |
8209 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8210 | __skb_queue_tail(head, skb); | |
8211 | spin_unlock_irq(&head->lock); | |
8212 | } | |
8213 | #else | |
8214 | fput(file); | |
8215 | #endif | |
8216 | } | |
8217 | ||
b895c9a6 | 8218 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8219 | { |
b895c9a6 | 8220 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8221 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8222 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8223 | |
269bbe5f BM |
8224 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8225 | list_del(&prsrc->list); | |
b60c8dce PB |
8226 | |
8227 | if (prsrc->tag) { | |
8228 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8229 | |
8230 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8231 | spin_lock(&ctx->completion_lock); |
913a571a | 8232 | io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); |
b60c8dce | 8233 | io_commit_cqring(ctx); |
79ebeaee | 8234 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8235 | io_cqring_ev_posted(ctx); |
8236 | io_ring_submit_unlock(ctx, lock_ring); | |
8237 | } | |
8238 | ||
40ae0ff7 | 8239 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8240 | kfree(prsrc); |
65e19f54 | 8241 | } |
05589553 | 8242 | |
28a9fe25 | 8243 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8244 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8245 | complete(&rsrc_data->done); | |
2faf852d | 8246 | } |
65e19f54 | 8247 | |
269bbe5f | 8248 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8249 | { |
8250 | struct io_ring_ctx *ctx; | |
8251 | struct llist_node *node; | |
8252 | ||
269bbe5f BM |
8253 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8254 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8255 | |
8256 | while (node) { | |
b895c9a6 | 8257 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8258 | struct llist_node *next = node->next; |
8259 | ||
b895c9a6 | 8260 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8261 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8262 | node = next; |
8263 | } | |
8264 | } | |
8265 | ||
6b06314c | 8266 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8267 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8268 | { |
8269 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8270 | struct file *file; |
f3baed39 | 8271 | int fd, ret; |
846a4ef2 | 8272 | unsigned i; |
6b06314c | 8273 | |
05f3fb3c | 8274 | if (ctx->file_data) |
6b06314c JA |
8275 | return -EBUSY; |
8276 | if (!nr_args) | |
8277 | return -EINVAL; | |
8278 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8279 | return -EMFILE; | |
3a1b8a4e PB |
8280 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8281 | return -EMFILE; | |
a7f0ed5a | 8282 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8283 | if (ret) |
8284 | return ret; | |
d878c816 PB |
8285 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8286 | &ctx->file_data); | |
8287 | if (ret) | |
8288 | return ret; | |
6b06314c | 8289 | |
f3baed39 | 8290 | ret = -ENOMEM; |
aeca241b | 8291 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8292 | goto out_free; |
65e19f54 | 8293 | |
08a45173 | 8294 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8295 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8296 | ret = -EFAULT; |
8297 | goto out_fput; | |
8298 | } | |
08a45173 | 8299 | /* allow sparse sets */ |
792e3582 PB |
8300 | if (fd == -1) { |
8301 | ret = -EINVAL; | |
2d091d62 | 8302 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8303 | goto out_fput; |
08a45173 | 8304 | continue; |
792e3582 | 8305 | } |
6b06314c | 8306 | |
05f3fb3c | 8307 | file = fget(fd); |
6b06314c | 8308 | ret = -EBADF; |
792e3582 | 8309 | if (unlikely(!file)) |
600cf3f8 | 8310 | goto out_fput; |
05f3fb3c | 8311 | |
6b06314c JA |
8312 | /* |
8313 | * Don't allow io_uring instances to be registered. If UNIX | |
8314 | * isn't enabled, then this causes a reference cycle and this | |
8315 | * instance can never get freed. If UNIX is enabled we'll | |
8316 | * handle it just fine, but there's still no point in allowing | |
8317 | * a ring fd as it doesn't support regular read/write anyway. | |
8318 | */ | |
05f3fb3c JA |
8319 | if (file->f_op == &io_uring_fops) { |
8320 | fput(file); | |
600cf3f8 | 8321 | goto out_fput; |
6b06314c | 8322 | } |
aeca241b | 8323 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8324 | } |
8325 | ||
6b06314c | 8326 | ret = io_sqe_files_scm(ctx); |
05589553 | 8327 | if (ret) { |
08480400 | 8328 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8329 | return ret; |
8330 | } | |
6b06314c | 8331 | |
a7f0ed5a | 8332 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8333 | return ret; |
600cf3f8 PB |
8334 | out_fput: |
8335 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8336 | file = io_file_from_index(ctx, i); | |
8337 | if (file) | |
8338 | fput(file); | |
8339 | } | |
042b0d85 | 8340 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8341 | ctx->nr_user_files = 0; |
600cf3f8 | 8342 | out_free: |
44b31f2f | 8343 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8344 | ctx->file_data = NULL; |
6b06314c JA |
8345 | return ret; |
8346 | } | |
8347 | ||
c3a31e60 JA |
8348 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8349 | int index) | |
8350 | { | |
8351 | #if defined(CONFIG_UNIX) | |
8352 | struct sock *sock = ctx->ring_sock->sk; | |
8353 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8354 | struct sk_buff *skb; | |
8355 | ||
8356 | /* | |
8357 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8358 | * file set. If there's no room, fall back to allocating a new skb | |
8359 | * and filling it in. | |
8360 | */ | |
8361 | spin_lock_irq(&head->lock); | |
8362 | skb = skb_peek(head); | |
8363 | if (skb) { | |
8364 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8365 | ||
8366 | if (fpl->count < SCM_MAX_FD) { | |
8367 | __skb_unlink(skb, head); | |
8368 | spin_unlock_irq(&head->lock); | |
8369 | fpl->fp[fpl->count] = get_file(file); | |
8370 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8371 | fpl->count++; | |
8372 | spin_lock_irq(&head->lock); | |
8373 | __skb_queue_head(head, skb); | |
8374 | } else { | |
8375 | skb = NULL; | |
8376 | } | |
8377 | } | |
8378 | spin_unlock_irq(&head->lock); | |
8379 | ||
8380 | if (skb) { | |
8381 | fput(file); | |
8382 | return 0; | |
8383 | } | |
8384 | ||
8385 | return __io_sqe_files_scm(ctx, 1, index); | |
8386 | #else | |
8387 | return 0; | |
8388 | #endif | |
8389 | } | |
8390 | ||
9c7b0ba8 PB |
8391 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8392 | struct io_rsrc_node *node, void *rsrc) | |
8393 | { | |
8394 | struct io_rsrc_put *prsrc; | |
8395 | ||
8396 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8397 | if (!prsrc) | |
8398 | return -ENOMEM; | |
8399 | ||
8400 | prsrc->tag = *io_get_tag_slot(data, idx); | |
8401 | prsrc->rsrc = rsrc; | |
8402 | list_add(&prsrc->list, &node->rsrc_list); | |
8403 | return 0; | |
8404 | } | |
8405 | ||
b9445598 PB |
8406 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8407 | unsigned int issue_flags, u32 slot_index) | |
8408 | { | |
8409 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 8410 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
9c7b0ba8 | 8411 | bool needs_switch = false; |
b9445598 PB |
8412 | struct io_fixed_file *file_slot; |
8413 | int ret = -EBADF; | |
8414 | ||
3b44b371 | 8415 | io_ring_submit_lock(ctx, needs_lock); |
b9445598 PB |
8416 | if (file->f_op == &io_uring_fops) |
8417 | goto err; | |
8418 | ret = -ENXIO; | |
8419 | if (!ctx->file_data) | |
8420 | goto err; | |
8421 | ret = -EINVAL; | |
8422 | if (slot_index >= ctx->nr_user_files) | |
8423 | goto err; | |
8424 | ||
8425 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8426 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8427 | |
8428 | if (file_slot->file_ptr) { | |
8429 | struct file *old_file; | |
8430 | ||
8431 | ret = io_rsrc_node_switch_start(ctx); | |
8432 | if (ret) | |
8433 | goto err; | |
8434 | ||
8435 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8436 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8437 | ctx->rsrc_node, old_file); | |
8438 | if (ret) | |
8439 | goto err; | |
8440 | file_slot->file_ptr = 0; | |
8441 | needs_switch = true; | |
8442 | } | |
b9445598 PB |
8443 | |
8444 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8445 | io_fixed_file_set(file_slot, file); | |
8446 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8447 | if (ret) { | |
8448 | file_slot->file_ptr = 0; | |
8449 | goto err; | |
8450 | } | |
8451 | ||
8452 | ret = 0; | |
8453 | err: | |
9c7b0ba8 PB |
8454 | if (needs_switch) |
8455 | io_rsrc_node_switch(ctx, ctx->file_data); | |
3b44b371 | 8456 | io_ring_submit_unlock(ctx, needs_lock); |
b9445598 PB |
8457 | if (ret) |
8458 | fput(file); | |
8459 | return ret; | |
8460 | } | |
8461 | ||
7df778be PB |
8462 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
8463 | { | |
8464 | unsigned int offset = req->close.file_slot - 1; | |
8465 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 8466 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
7df778be PB |
8467 | struct io_fixed_file *file_slot; |
8468 | struct file *file; | |
8469 | int ret, i; | |
8470 | ||
3b44b371 | 8471 | io_ring_submit_lock(ctx, needs_lock); |
7df778be PB |
8472 | ret = -ENXIO; |
8473 | if (unlikely(!ctx->file_data)) | |
8474 | goto out; | |
8475 | ret = -EINVAL; | |
8476 | if (offset >= ctx->nr_user_files) | |
8477 | goto out; | |
8478 | ret = io_rsrc_node_switch_start(ctx); | |
8479 | if (ret) | |
8480 | goto out; | |
8481 | ||
8482 | i = array_index_nospec(offset, ctx->nr_user_files); | |
8483 | file_slot = io_fixed_file_slot(&ctx->file_table, i); | |
8484 | ret = -EBADF; | |
8485 | if (!file_slot->file_ptr) | |
8486 | goto out; | |
8487 | ||
8488 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8489 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
8490 | if (ret) | |
8491 | goto out; | |
8492 | ||
8493 | file_slot->file_ptr = 0; | |
8494 | io_rsrc_node_switch(ctx, ctx->file_data); | |
8495 | ret = 0; | |
8496 | out: | |
3b44b371 | 8497 | io_ring_submit_unlock(ctx, needs_lock); |
7df778be PB |
8498 | return ret; |
8499 | } | |
8500 | ||
05f3fb3c | 8501 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 8502 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8503 | unsigned nr_args) |
8504 | { | |
c3bdad02 | 8505 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8506 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8507 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8508 | struct io_fixed_file *file_slot; |
8509 | struct file *file; | |
98f0b3b4 PB |
8510 | int fd, i, err = 0; |
8511 | unsigned int done; | |
05589553 | 8512 | bool needs_switch = false; |
c3a31e60 | 8513 | |
98f0b3b4 PB |
8514 | if (!ctx->file_data) |
8515 | return -ENXIO; | |
8516 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8517 | return -EINVAL; |
8518 | ||
67973b93 | 8519 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8520 | u64 tag = 0; |
8521 | ||
8522 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8523 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8524 | err = -EFAULT; |
8525 | break; | |
8526 | } | |
c3bdad02 PB |
8527 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8528 | err = -EINVAL; | |
8529 | break; | |
8530 | } | |
4e0377a1 | 8531 | if (fd == IORING_REGISTER_FILES_SKIP) |
8532 | continue; | |
8533 | ||
67973b93 | 8534 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8535 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8536 | |
a04b0ac0 PB |
8537 | if (file_slot->file_ptr) { |
8538 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8539 | err = io_queue_rsrc_removal(data, up->offset + done, |
8540 | ctx->rsrc_node, file); | |
a5318d3c HD |
8541 | if (err) |
8542 | break; | |
a04b0ac0 | 8543 | file_slot->file_ptr = 0; |
05589553 | 8544 | needs_switch = true; |
c3a31e60 JA |
8545 | } |
8546 | if (fd != -1) { | |
c3a31e60 JA |
8547 | file = fget(fd); |
8548 | if (!file) { | |
8549 | err = -EBADF; | |
8550 | break; | |
8551 | } | |
8552 | /* | |
8553 | * Don't allow io_uring instances to be registered. If | |
8554 | * UNIX isn't enabled, then this causes a reference | |
8555 | * cycle and this instance can never get freed. If UNIX | |
8556 | * is enabled we'll handle it just fine, but there's | |
8557 | * still no point in allowing a ring fd as it doesn't | |
8558 | * support regular read/write anyway. | |
8559 | */ | |
8560 | if (file->f_op == &io_uring_fops) { | |
8561 | fput(file); | |
8562 | err = -EBADF; | |
8563 | break; | |
8564 | } | |
2d091d62 | 8565 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8566 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8567 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8568 | if (err) { |
a04b0ac0 | 8569 | file_slot->file_ptr = 0; |
f3bd9dae | 8570 | fput(file); |
c3a31e60 | 8571 | break; |
f3bd9dae | 8572 | } |
c3a31e60 | 8573 | } |
05f3fb3c JA |
8574 | } |
8575 | ||
a7f0ed5a PB |
8576 | if (needs_switch) |
8577 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8578 | return done ? done : err; |
8579 | } | |
05589553 | 8580 | |
685fe7fe JA |
8581 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8582 | struct task_struct *task) | |
24369c2e | 8583 | { |
e941894e | 8584 | struct io_wq_hash *hash; |
24369c2e | 8585 | struct io_wq_data data; |
24369c2e | 8586 | unsigned int concurrency; |
24369c2e | 8587 | |
362a9e65 | 8588 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8589 | hash = ctx->hash_map; |
8590 | if (!hash) { | |
8591 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8592 | if (!hash) { |
8593 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8594 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8595 | } |
e941894e JA |
8596 | refcount_set(&hash->refs, 1); |
8597 | init_waitqueue_head(&hash->wait); | |
8598 | ctx->hash_map = hash; | |
24369c2e | 8599 | } |
362a9e65 | 8600 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8601 | |
e941894e | 8602 | data.hash = hash; |
685fe7fe | 8603 | data.task = task; |
ebc11b6c | 8604 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8605 | data.do_work = io_wq_submit_work; |
24369c2e | 8606 | |
d25e3a3d JA |
8607 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8608 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8609 | |
5aa75ed5 | 8610 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8611 | } |
8612 | ||
c072481d PB |
8613 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
8614 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8615 | { |
8616 | struct io_uring_task *tctx; | |
d8a6df10 | 8617 | int ret; |
0f212204 | 8618 | |
09899b19 | 8619 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8620 | if (unlikely(!tctx)) |
8621 | return -ENOMEM; | |
8622 | ||
d8a6df10 JA |
8623 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8624 | if (unlikely(ret)) { | |
8625 | kfree(tctx); | |
8626 | return ret; | |
8627 | } | |
8628 | ||
685fe7fe | 8629 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8630 | if (IS_ERR(tctx->io_wq)) { |
8631 | ret = PTR_ERR(tctx->io_wq); | |
8632 | percpu_counter_destroy(&tctx->inflight); | |
8633 | kfree(tctx); | |
8634 | return ret; | |
8635 | } | |
8636 | ||
0f212204 JA |
8637 | xa_init(&tctx->xa); |
8638 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8639 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8640 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8641 | task->io_uring = tctx; |
7cbf1722 JA |
8642 | spin_lock_init(&tctx->task_lock); |
8643 | INIT_WQ_LIST(&tctx->task_list); | |
4813c377 | 8644 | INIT_WQ_LIST(&tctx->prior_task_list); |
7cbf1722 | 8645 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8646 | return 0; |
8647 | } | |
8648 | ||
8649 | void __io_uring_free(struct task_struct *tsk) | |
8650 | { | |
8651 | struct io_uring_task *tctx = tsk->io_uring; | |
8652 | ||
8653 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8654 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8655 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8656 | |
d8a6df10 | 8657 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8658 | kfree(tctx); |
8659 | tsk->io_uring = NULL; | |
8660 | } | |
8661 | ||
c072481d PB |
8662 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
8663 | struct io_uring_params *p) | |
2b188cc1 JA |
8664 | { |
8665 | int ret; | |
8666 | ||
d25e3a3d JA |
8667 | /* Retain compatibility with failing for an invalid attach attempt */ |
8668 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8669 | IORING_SETUP_ATTACH_WQ) { | |
8670 | struct fd f; | |
8671 | ||
8672 | f = fdget(p->wq_fd); | |
8673 | if (!f.file) | |
8674 | return -ENXIO; | |
0cc936f7 JA |
8675 | if (f.file->f_op != &io_uring_fops) { |
8676 | fdput(f); | |
f2a48dd0 | 8677 | return -EINVAL; |
0cc936f7 JA |
8678 | } |
8679 | fdput(f); | |
d25e3a3d | 8680 | } |
6c271ce2 | 8681 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8682 | struct task_struct *tsk; |
534ca6d6 | 8683 | struct io_sq_data *sqd; |
26984fbf | 8684 | bool attached; |
534ca6d6 | 8685 | |
cdc1404a PM |
8686 | ret = security_uring_sqpoll(); |
8687 | if (ret) | |
8688 | return ret; | |
8689 | ||
26984fbf | 8690 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8691 | if (IS_ERR(sqd)) { |
8692 | ret = PTR_ERR(sqd); | |
8693 | goto err; | |
8694 | } | |
69fb2131 | 8695 | |
7c30f36a | 8696 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8697 | ctx->sq_data = sqd; |
917257da JA |
8698 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8699 | if (!ctx->sq_thread_idle) | |
8700 | ctx->sq_thread_idle = HZ; | |
8701 | ||
78d7f6ba | 8702 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8703 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8704 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8705 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8706 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8707 | io_sq_thread_unpark(sqd); |
8708 | ||
de75a3d3 PB |
8709 | if (ret < 0) |
8710 | goto err; | |
8711 | if (attached) | |
5aa75ed5 | 8712 | return 0; |
aa06165d | 8713 | |
6c271ce2 | 8714 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8715 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8716 | |
917257da | 8717 | ret = -EINVAL; |
f2a48dd0 | 8718 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8719 | goto err_sqpoll; |
37d1e2e3 | 8720 | sqd->sq_cpu = cpu; |
6c271ce2 | 8721 | } else { |
37d1e2e3 | 8722 | sqd->sq_cpu = -1; |
6c271ce2 | 8723 | } |
37d1e2e3 JA |
8724 | |
8725 | sqd->task_pid = current->pid; | |
5c2469e0 | 8726 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8727 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8728 | if (IS_ERR(tsk)) { | |
8729 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8730 | goto err_sqpoll; |
6c271ce2 | 8731 | } |
97a73a0f | 8732 | |
46fe18b1 | 8733 | sqd->thread = tsk; |
97a73a0f | 8734 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8735 | wake_up_new_task(tsk); |
0f212204 JA |
8736 | if (ret) |
8737 | goto err; | |
6c271ce2 JA |
8738 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8739 | /* Can't have SQ_AFF without SQPOLL */ | |
8740 | ret = -EINVAL; | |
8741 | goto err; | |
8742 | } | |
8743 | ||
2b188cc1 | 8744 | return 0; |
f2a48dd0 PB |
8745 | err_sqpoll: |
8746 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8747 | err: |
37d1e2e3 | 8748 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8749 | return ret; |
8750 | } | |
8751 | ||
a087e2b5 BM |
8752 | static inline void __io_unaccount_mem(struct user_struct *user, |
8753 | unsigned long nr_pages) | |
2b188cc1 JA |
8754 | { |
8755 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8756 | } | |
8757 | ||
a087e2b5 BM |
8758 | static inline int __io_account_mem(struct user_struct *user, |
8759 | unsigned long nr_pages) | |
2b188cc1 JA |
8760 | { |
8761 | unsigned long page_limit, cur_pages, new_pages; | |
8762 | ||
8763 | /* Don't allow more pages than we can safely lock */ | |
8764 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8765 | ||
8766 | do { | |
8767 | cur_pages = atomic_long_read(&user->locked_vm); | |
8768 | new_pages = cur_pages + nr_pages; | |
8769 | if (new_pages > page_limit) | |
8770 | return -ENOMEM; | |
8771 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8772 | new_pages) != cur_pages); | |
8773 | ||
8774 | return 0; | |
8775 | } | |
8776 | ||
26bfa89e | 8777 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8778 | { |
62e398be | 8779 | if (ctx->user) |
a087e2b5 | 8780 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8781 | |
26bfa89e JA |
8782 | if (ctx->mm_account) |
8783 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8784 | } |
8785 | ||
26bfa89e | 8786 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8787 | { |
30975825 BM |
8788 | int ret; |
8789 | ||
62e398be | 8790 | if (ctx->user) { |
30975825 BM |
8791 | ret = __io_account_mem(ctx->user, nr_pages); |
8792 | if (ret) | |
8793 | return ret; | |
8794 | } | |
8795 | ||
26bfa89e JA |
8796 | if (ctx->mm_account) |
8797 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8798 | |
8799 | return 0; | |
8800 | } | |
8801 | ||
2b188cc1 JA |
8802 | static void io_mem_free(void *ptr) |
8803 | { | |
52e04ef4 MR |
8804 | struct page *page; |
8805 | ||
8806 | if (!ptr) | |
8807 | return; | |
2b188cc1 | 8808 | |
52e04ef4 | 8809 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8810 | if (put_page_testzero(page)) |
8811 | free_compound_page(page); | |
8812 | } | |
8813 | ||
8814 | static void *io_mem_alloc(size_t size) | |
8815 | { | |
8816 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8817 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8818 | |
8819 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8820 | } | |
8821 | ||
75b28aff HV |
8822 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8823 | size_t *sq_offset) | |
8824 | { | |
8825 | struct io_rings *rings; | |
8826 | size_t off, sq_array_size; | |
8827 | ||
8828 | off = struct_size(rings, cqes, cq_entries); | |
8829 | if (off == SIZE_MAX) | |
8830 | return SIZE_MAX; | |
8831 | ||
8832 | #ifdef CONFIG_SMP | |
8833 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8834 | if (off == 0) | |
8835 | return SIZE_MAX; | |
8836 | #endif | |
8837 | ||
b36200f5 DV |
8838 | if (sq_offset) |
8839 | *sq_offset = off; | |
8840 | ||
75b28aff HV |
8841 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8842 | if (sq_array_size == SIZE_MAX) | |
8843 | return SIZE_MAX; | |
8844 | ||
8845 | if (check_add_overflow(off, sq_array_size, &off)) | |
8846 | return SIZE_MAX; | |
8847 | ||
75b28aff HV |
8848 | return off; |
8849 | } | |
8850 | ||
41edf1a5 | 8851 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8852 | { |
41edf1a5 | 8853 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8854 | unsigned int i; |
8855 | ||
6224843d PB |
8856 | if (imu != ctx->dummy_ubuf) { |
8857 | for (i = 0; i < imu->nr_bvecs; i++) | |
8858 | unpin_user_page(imu->bvec[i].bv_page); | |
8859 | if (imu->acct_pages) | |
8860 | io_unaccount_mem(ctx, imu->acct_pages); | |
8861 | kvfree(imu); | |
8862 | } | |
41edf1a5 | 8863 | *slot = NULL; |
7f61a1e9 PB |
8864 | } |
8865 | ||
bd54b6fe | 8866 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8867 | { |
634d00df PB |
8868 | io_buffer_unmap(ctx, &prsrc->buf); |
8869 | prsrc->buf = NULL; | |
bd54b6fe | 8870 | } |
edafccee | 8871 | |
bd54b6fe BM |
8872 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8873 | { | |
8874 | unsigned int i; | |
edafccee | 8875 | |
7f61a1e9 PB |
8876 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8877 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8878 | kfree(ctx->user_bufs); |
bb6659cc | 8879 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8880 | ctx->user_bufs = NULL; |
bd54b6fe | 8881 | ctx->buf_data = NULL; |
edafccee | 8882 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8883 | } |
8884 | ||
0a96bbe4 | 8885 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8886 | { |
bd54b6fe | 8887 | int ret; |
edafccee | 8888 | |
bd54b6fe | 8889 | if (!ctx->buf_data) |
edafccee JA |
8890 | return -ENXIO; |
8891 | ||
bd54b6fe BM |
8892 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8893 | if (!ret) | |
8894 | __io_sqe_buffers_unregister(ctx); | |
8895 | return ret; | |
edafccee JA |
8896 | } |
8897 | ||
8898 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8899 | void __user *arg, unsigned index) | |
8900 | { | |
8901 | struct iovec __user *src; | |
8902 | ||
8903 | #ifdef CONFIG_COMPAT | |
8904 | if (ctx->compat) { | |
8905 | struct compat_iovec __user *ciovs; | |
8906 | struct compat_iovec ciov; | |
8907 | ||
8908 | ciovs = (struct compat_iovec __user *) arg; | |
8909 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8910 | return -EFAULT; | |
8911 | ||
d55e5f5b | 8912 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8913 | dst->iov_len = ciov.iov_len; |
8914 | return 0; | |
8915 | } | |
8916 | #endif | |
8917 | src = (struct iovec __user *) arg; | |
8918 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8919 | return -EFAULT; | |
8920 | return 0; | |
8921 | } | |
8922 | ||
de293938 JA |
8923 | /* |
8924 | * Not super efficient, but this is just a registration time. And we do cache | |
8925 | * the last compound head, so generally we'll only do a full search if we don't | |
8926 | * match that one. | |
8927 | * | |
8928 | * We check if the given compound head page has already been accounted, to | |
8929 | * avoid double accounting it. This allows us to account the full size of the | |
8930 | * page, not just the constituent pages of a huge page. | |
8931 | */ | |
8932 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8933 | int nr_pages, struct page *hpage) | |
8934 | { | |
8935 | int i, j; | |
8936 | ||
8937 | /* check current page array */ | |
8938 | for (i = 0; i < nr_pages; i++) { | |
8939 | if (!PageCompound(pages[i])) | |
8940 | continue; | |
8941 | if (compound_head(pages[i]) == hpage) | |
8942 | return true; | |
8943 | } | |
8944 | ||
8945 | /* check previously registered pages */ | |
8946 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8947 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8948 | |
8949 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8950 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8951 | continue; | |
8952 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8953 | return true; | |
8954 | } | |
8955 | } | |
8956 | ||
8957 | return false; | |
8958 | } | |
8959 | ||
8960 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8961 | int nr_pages, struct io_mapped_ubuf *imu, | |
8962 | struct page **last_hpage) | |
8963 | { | |
8964 | int i, ret; | |
8965 | ||
216e5835 | 8966 | imu->acct_pages = 0; |
de293938 JA |
8967 | for (i = 0; i < nr_pages; i++) { |
8968 | if (!PageCompound(pages[i])) { | |
8969 | imu->acct_pages++; | |
8970 | } else { | |
8971 | struct page *hpage; | |
8972 | ||
8973 | hpage = compound_head(pages[i]); | |
8974 | if (hpage == *last_hpage) | |
8975 | continue; | |
8976 | *last_hpage = hpage; | |
8977 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8978 | continue; | |
8979 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8980 | } | |
8981 | } | |
8982 | ||
8983 | if (!imu->acct_pages) | |
8984 | return 0; | |
8985 | ||
26bfa89e | 8986 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8987 | if (ret) |
8988 | imu->acct_pages = 0; | |
8989 | return ret; | |
8990 | } | |
8991 | ||
0a96bbe4 | 8992 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8993 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8994 | struct page **last_hpage) |
edafccee | 8995 | { |
41edf1a5 | 8996 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8997 | struct vm_area_struct **vmas = NULL; |
8998 | struct page **pages = NULL; | |
0a96bbe4 BM |
8999 | unsigned long off, start, end, ubuf; |
9000 | size_t size; | |
9001 | int ret, pret, nr_pages, i; | |
9002 | ||
6224843d PB |
9003 | if (!iov->iov_base) { |
9004 | *pimu = ctx->dummy_ubuf; | |
9005 | return 0; | |
9006 | } | |
9007 | ||
0a96bbe4 BM |
9008 | ubuf = (unsigned long) iov->iov_base; |
9009 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
9010 | start = ubuf >> PAGE_SHIFT; | |
9011 | nr_pages = end - start; | |
9012 | ||
41edf1a5 | 9013 | *pimu = NULL; |
0a96bbe4 BM |
9014 | ret = -ENOMEM; |
9015 | ||
9016 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
9017 | if (!pages) | |
9018 | goto done; | |
9019 | ||
9020 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
9021 | GFP_KERNEL); | |
9022 | if (!vmas) | |
9023 | goto done; | |
edafccee | 9024 | |
41edf1a5 | 9025 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 9026 | if (!imu) |
0a96bbe4 BM |
9027 | goto done; |
9028 | ||
9029 | ret = 0; | |
9030 | mmap_read_lock(current->mm); | |
9031 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
9032 | pages, vmas); | |
9033 | if (pret == nr_pages) { | |
9034 | /* don't support file backed memory */ | |
9035 | for (i = 0; i < nr_pages; i++) { | |
9036 | struct vm_area_struct *vma = vmas[i]; | |
9037 | ||
40dad765 PB |
9038 | if (vma_is_shmem(vma)) |
9039 | continue; | |
0a96bbe4 BM |
9040 | if (vma->vm_file && |
9041 | !is_file_hugepages(vma->vm_file)) { | |
9042 | ret = -EOPNOTSUPP; | |
9043 | break; | |
9044 | } | |
9045 | } | |
9046 | } else { | |
9047 | ret = pret < 0 ? pret : -EFAULT; | |
9048 | } | |
9049 | mmap_read_unlock(current->mm); | |
9050 | if (ret) { | |
9051 | /* | |
9052 | * if we did partial map, or found file backed vmas, | |
9053 | * release any pages we did get | |
9054 | */ | |
9055 | if (pret > 0) | |
9056 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9057 | goto done; |
9058 | } | |
9059 | ||
9060 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
9061 | if (ret) { | |
9062 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9063 | goto done; |
9064 | } | |
9065 | ||
9066 | off = ubuf & ~PAGE_MASK; | |
9067 | size = iov->iov_len; | |
9068 | for (i = 0; i < nr_pages; i++) { | |
9069 | size_t vec_len; | |
9070 | ||
9071 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
9072 | imu->bvec[i].bv_page = pages[i]; | |
9073 | imu->bvec[i].bv_len = vec_len; | |
9074 | imu->bvec[i].bv_offset = off; | |
9075 | off = 0; | |
9076 | size -= vec_len; | |
9077 | } | |
9078 | /* store original address for later verification */ | |
9079 | imu->ubuf = ubuf; | |
4751f53d | 9080 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 9081 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 9082 | *pimu = imu; |
0a96bbe4 BM |
9083 | ret = 0; |
9084 | done: | |
41edf1a5 PB |
9085 | if (ret) |
9086 | kvfree(imu); | |
0a96bbe4 BM |
9087 | kvfree(pages); |
9088 | kvfree(vmas); | |
9089 | return ret; | |
9090 | } | |
9091 | ||
2b358604 | 9092 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 9093 | { |
87094465 PB |
9094 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
9095 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9096 | } |
edafccee | 9097 | |
2b358604 BM |
9098 | static int io_buffer_validate(struct iovec *iov) |
9099 | { | |
50e96989 PB |
9100 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9101 | ||
2b358604 BM |
9102 | /* |
9103 | * Don't impose further limits on the size and buffer | |
9104 | * constraints here, we'll -EINVAL later when IO is | |
9105 | * submitted if they are wrong. | |
9106 | */ | |
6224843d PB |
9107 | if (!iov->iov_base) |
9108 | return iov->iov_len ? -EFAULT : 0; | |
9109 | if (!iov->iov_len) | |
2b358604 | 9110 | return -EFAULT; |
edafccee | 9111 | |
2b358604 BM |
9112 | /* arbitrary limit, but we need something */ |
9113 | if (iov->iov_len > SZ_1G) | |
9114 | return -EFAULT; | |
edafccee | 9115 | |
50e96989 PB |
9116 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9117 | return -EOVERFLOW; | |
9118 | ||
2b358604 BM |
9119 | return 0; |
9120 | } | |
edafccee | 9121 | |
2b358604 | 9122 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9123 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9124 | { |
bd54b6fe BM |
9125 | struct page *last_hpage = NULL; |
9126 | struct io_rsrc_data *data; | |
2b358604 BM |
9127 | int i, ret; |
9128 | struct iovec iov; | |
edafccee | 9129 | |
87094465 PB |
9130 | if (ctx->user_bufs) |
9131 | return -EBUSY; | |
489809e2 | 9132 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9133 | return -EINVAL; |
bd54b6fe | 9134 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9135 | if (ret) |
9136 | return ret; | |
d878c816 PB |
9137 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9138 | if (ret) | |
9139 | return ret; | |
bd54b6fe BM |
9140 | ret = io_buffers_map_alloc(ctx, nr_args); |
9141 | if (ret) { | |
bb6659cc | 9142 | io_rsrc_data_free(data); |
bd54b6fe BM |
9143 | return ret; |
9144 | } | |
edafccee | 9145 | |
87094465 | 9146 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9147 | ret = io_copy_iov(ctx, &iov, arg, i); |
9148 | if (ret) | |
0a96bbe4 | 9149 | break; |
2b358604 BM |
9150 | ret = io_buffer_validate(&iov); |
9151 | if (ret) | |
0a96bbe4 | 9152 | break; |
2d091d62 | 9153 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9154 | ret = -EINVAL; |
9155 | break; | |
9156 | } | |
edafccee | 9157 | |
41edf1a5 PB |
9158 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9159 | &last_hpage); | |
0a96bbe4 BM |
9160 | if (ret) |
9161 | break; | |
edafccee | 9162 | } |
0a96bbe4 | 9163 | |
bd54b6fe | 9164 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9165 | |
bd54b6fe BM |
9166 | ctx->buf_data = data; |
9167 | if (ret) | |
9168 | __io_sqe_buffers_unregister(ctx); | |
9169 | else | |
9170 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9171 | return ret; |
9172 | } | |
9173 | ||
634d00df PB |
9174 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9175 | struct io_uring_rsrc_update2 *up, | |
9176 | unsigned int nr_args) | |
9177 | { | |
9178 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9179 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9180 | struct page *last_hpage = NULL; |
9181 | bool needs_switch = false; | |
9182 | __u32 done; | |
9183 | int i, err; | |
9184 | ||
9185 | if (!ctx->buf_data) | |
9186 | return -ENXIO; | |
9187 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9188 | return -EINVAL; | |
9189 | ||
9190 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9191 | struct io_mapped_ubuf *imu; |
9192 | int offset = up->offset + done; | |
634d00df PB |
9193 | u64 tag = 0; |
9194 | ||
9195 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9196 | if (err) | |
9197 | break; | |
9198 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9199 | err = -EFAULT; | |
9200 | break; | |
9201 | } | |
0b8c0e7c PB |
9202 | err = io_buffer_validate(&iov); |
9203 | if (err) | |
9204 | break; | |
cf3770e7 CIK |
9205 | if (!iov.iov_base && tag) { |
9206 | err = -EINVAL; | |
9207 | break; | |
9208 | } | |
0b8c0e7c PB |
9209 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9210 | if (err) | |
9211 | break; | |
634d00df | 9212 | |
0b8c0e7c | 9213 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9214 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
9215 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
9216 | ctx->rsrc_node, ctx->user_bufs[i]); | |
9217 | if (unlikely(err)) { | |
9218 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9219 | break; |
0b8c0e7c | 9220 | } |
634d00df PB |
9221 | ctx->user_bufs[i] = NULL; |
9222 | needs_switch = true; | |
9223 | } | |
9224 | ||
0b8c0e7c | 9225 | ctx->user_bufs[i] = imu; |
2d091d62 | 9226 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9227 | } |
9228 | ||
9229 | if (needs_switch) | |
9230 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9231 | return done ? done : err; | |
9232 | } | |
9233 | ||
9b402849 JA |
9234 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
9235 | { | |
9236 | __s32 __user *fds = arg; | |
9237 | int fd; | |
9238 | ||
9239 | if (ctx->cq_ev_fd) | |
9240 | return -EBUSY; | |
9241 | ||
9242 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9243 | return -EFAULT; | |
9244 | ||
9245 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
9246 | if (IS_ERR(ctx->cq_ev_fd)) { | |
9247 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 9248 | |
9b402849 JA |
9249 | ctx->cq_ev_fd = NULL; |
9250 | return ret; | |
9251 | } | |
9252 | ||
9253 | return 0; | |
9254 | } | |
9255 | ||
9256 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9257 | { | |
9258 | if (ctx->cq_ev_fd) { | |
9259 | eventfd_ctx_put(ctx->cq_ev_fd); | |
9260 | ctx->cq_ev_fd = NULL; | |
9261 | return 0; | |
9262 | } | |
9263 | ||
9264 | return -ENXIO; | |
9265 | } | |
9266 | ||
5a2e745d JA |
9267 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9268 | { | |
9e15c3a0 JA |
9269 | struct io_buffer *buf; |
9270 | unsigned long index; | |
9271 | ||
8bab4c09 | 9272 | xa_for_each(&ctx->io_buffers, index, buf) { |
9e15c3a0 | 9273 | __io_remove_buffers(ctx, buf, index, -1U); |
8bab4c09 JA |
9274 | cond_resched(); |
9275 | } | |
5a2e745d JA |
9276 | } |
9277 | ||
4010fec4 | 9278 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9279 | { |
cd0ca2e0 | 9280 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 9281 | int nr = 0; |
bf019da7 | 9282 | |
9a4fdbd8 | 9283 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 9284 | io_flush_cached_locked_reqs(ctx, state); |
9a4fdbd8 | 9285 | |
c2b6c6bc PB |
9286 | while (state->free_list.next) { |
9287 | struct io_wq_work_node *node; | |
9288 | struct io_kiocb *req; | |
9a4fdbd8 | 9289 | |
c2b6c6bc PB |
9290 | node = wq_stack_extract(&state->free_list); |
9291 | req = container_of(node, struct io_kiocb, comp_list); | |
9292 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 9293 | nr++; |
c2b6c6bc | 9294 | } |
37f0e767 PB |
9295 | if (nr) |
9296 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
9297 | mutex_unlock(&ctx->uring_lock); |
9298 | } | |
9299 | ||
43597aac | 9300 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9301 | { |
43597aac | 9302 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9303 | wait_for_completion(&data->done); |
bd54b6fe | 9304 | } |
04fc6c80 | 9305 | |
c072481d | 9306 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9307 | { |
37d1e2e3 | 9308 | io_sq_thread_finish(ctx); |
2aede0e4 | 9309 | |
37d1e2e3 | 9310 | if (ctx->mm_account) { |
2aede0e4 JA |
9311 | mmdrop(ctx->mm_account); |
9312 | ctx->mm_account = NULL; | |
30975825 | 9313 | } |
def596e9 | 9314 | |
ab409402 | 9315 | io_rsrc_refs_drop(ctx); |
43597aac PB |
9316 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9317 | io_wait_rsrc_data(ctx->buf_data); | |
9318 | io_wait_rsrc_data(ctx->file_data); | |
9319 | ||
8bad28d8 | 9320 | mutex_lock(&ctx->uring_lock); |
43597aac | 9321 | if (ctx->buf_data) |
bd54b6fe | 9322 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9323 | if (ctx->file_data) |
08480400 | 9324 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9325 | if (ctx->rings) |
9326 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 9327 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 9328 | io_eventfd_unregister(ctx); |
5a2e745d | 9329 | io_destroy_buffers(ctx); |
07db298a PB |
9330 | if (ctx->sq_creds) |
9331 | put_cred(ctx->sq_creds); | |
def596e9 | 9332 | |
a7f0ed5a PB |
9333 | /* there are no registered resources left, nobody uses it */ |
9334 | if (ctx->rsrc_node) | |
9335 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9336 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9337 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 9338 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 9339 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
9340 | |
9341 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9342 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9343 | |
2b188cc1 | 9344 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9345 | if (ctx->ring_sock) { |
9346 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9347 | sock_release(ctx->ring_sock); |
355e8d26 | 9348 | } |
2b188cc1 | 9349 | #endif |
ef9dd637 | 9350 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9351 | |
75b28aff | 9352 | io_mem_free(ctx->rings); |
2b188cc1 | 9353 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9354 | |
9355 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9356 | free_uid(ctx->user); |
4010fec4 | 9357 | io_req_caches_free(ctx); |
e941894e JA |
9358 | if (ctx->hash_map) |
9359 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9360 | kfree(ctx->cancel_hash); |
6224843d | 9361 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
9362 | kfree(ctx); |
9363 | } | |
9364 | ||
9365 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9366 | { | |
9367 | struct io_ring_ctx *ctx = file->private_data; | |
9368 | __poll_t mask = 0; | |
9369 | ||
d60aa65b | 9370 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
9371 | /* |
9372 | * synchronizes with barrier from wq_has_sleeper call in | |
9373 | * io_commit_cqring | |
9374 | */ | |
2b188cc1 | 9375 | smp_rmb(); |
90554200 | 9376 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9377 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9378 | |
9379 | /* | |
9380 | * Don't flush cqring overflow list here, just do a simple check. | |
9381 | * Otherwise there could possible be ABBA deadlock: | |
9382 | * CPU0 CPU1 | |
9383 | * ---- ---- | |
9384 | * lock(&ctx->uring_lock); | |
9385 | * lock(&ep->mtx); | |
9386 | * lock(&ctx->uring_lock); | |
9387 | * lock(&ep->mtx); | |
9388 | * | |
9389 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9390 | * pushs them to do the flush. | |
9391 | */ | |
5ed7a37d | 9392 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9393 | mask |= EPOLLIN | EPOLLRDNORM; |
9394 | ||
9395 | return mask; | |
9396 | } | |
9397 | ||
0bead8cd | 9398 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9399 | { |
4379bf8b | 9400 | const struct cred *creds; |
071698e1 | 9401 | |
61cf9370 | 9402 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9403 | if (creds) { |
9404 | put_cred(creds); | |
0bead8cd | 9405 | return 0; |
1e6fa521 | 9406 | } |
0bead8cd YD |
9407 | |
9408 | return -EINVAL; | |
9409 | } | |
9410 | ||
d56d938b PB |
9411 | struct io_tctx_exit { |
9412 | struct callback_head task_work; | |
9413 | struct completion completion; | |
baf186c4 | 9414 | struct io_ring_ctx *ctx; |
d56d938b PB |
9415 | }; |
9416 | ||
c072481d | 9417 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
9418 | { |
9419 | struct io_uring_task *tctx = current->io_uring; | |
9420 | struct io_tctx_exit *work; | |
9421 | ||
9422 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9423 | /* | |
9424 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9425 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9426 | */ | |
9427 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9428 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9429 | complete(&work->completion); |
9430 | } | |
9431 | ||
c072481d | 9432 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
9433 | { |
9434 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9435 | ||
9436 | return req->ctx == data; | |
9437 | } | |
9438 | ||
c072481d | 9439 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 9440 | { |
d56d938b | 9441 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9442 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9443 | unsigned long interval = HZ / 20; |
d56d938b PB |
9444 | struct io_tctx_exit exit; |
9445 | struct io_tctx_node *node; | |
9446 | int ret; | |
85faa7b8 | 9447 | |
56952e91 JA |
9448 | /* |
9449 | * If we're doing polled IO and end up having requests being | |
9450 | * submitted async (out-of-line), then completions can come in while | |
9451 | * we're waiting for refs to drop. We need to reap these manually, | |
9452 | * as nobody else will be looking for them. | |
9453 | */ | |
b2edc0a7 | 9454 | do { |
3dd0c97a | 9455 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9456 | if (ctx->sq_data) { |
9457 | struct io_sq_data *sqd = ctx->sq_data; | |
9458 | struct task_struct *tsk; | |
9459 | ||
9460 | io_sq_thread_park(sqd); | |
9461 | tsk = sqd->thread; | |
9462 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9463 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9464 | io_cancel_ctx_cb, ctx, true); | |
9465 | io_sq_thread_unpark(sqd); | |
9466 | } | |
b5bb3a24 | 9467 | |
37f0e767 PB |
9468 | io_req_caches_free(ctx); |
9469 | ||
58d3be2c PB |
9470 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9471 | /* there is little hope left, don't run it too often */ | |
9472 | interval = HZ * 60; | |
9473 | } | |
9474 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9475 | |
7f00651a PB |
9476 | init_completion(&exit.completion); |
9477 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9478 | exit.ctx = ctx; | |
89b5066e PB |
9479 | /* |
9480 | * Some may use context even when all refs and requests have been put, | |
9481 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9482 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9483 | * this lock/unlock section also waits them to finish. |
9484 | */ | |
d56d938b PB |
9485 | mutex_lock(&ctx->uring_lock); |
9486 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9487 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9488 | ||
d56d938b PB |
9489 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9490 | ctx_node); | |
7f00651a PB |
9491 | /* don't spin on a single task if cancellation failed */ |
9492 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9493 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9494 | if (WARN_ON_ONCE(ret)) | |
9495 | continue; | |
d56d938b PB |
9496 | |
9497 | mutex_unlock(&ctx->uring_lock); | |
9498 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9499 | mutex_lock(&ctx->uring_lock); |
9500 | } | |
9501 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9502 | spin_lock(&ctx->completion_lock); |
9503 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9504 | |
85faa7b8 JA |
9505 | io_ring_ctx_free(ctx); |
9506 | } | |
9507 | ||
80c4cbdb | 9508 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
9509 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
9510 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
9511 | { |
9512 | struct io_kiocb *req, *tmp; | |
9513 | int canceled = 0; | |
9514 | ||
79ebeaee JA |
9515 | spin_lock(&ctx->completion_lock); |
9516 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9517 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9518 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9519 | io_kill_timeout(req, -ECANCELED); |
9520 | canceled++; | |
9521 | } | |
9522 | } | |
79ebeaee | 9523 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9524 | if (canceled != 0) |
9525 | io_commit_cqring(ctx); | |
79ebeaee | 9526 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9527 | if (canceled != 0) |
9528 | io_cqring_ev_posted(ctx); | |
9529 | return canceled != 0; | |
9530 | } | |
9531 | ||
c072481d | 9532 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 9533 | { |
61cf9370 MWO |
9534 | unsigned long index; |
9535 | struct creds *creds; | |
9536 | ||
2b188cc1 JA |
9537 | mutex_lock(&ctx->uring_lock); |
9538 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9539 | if (ctx->rings) |
6c2450ae | 9540 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9541 | xa_for_each(&ctx->personalities, index, creds) |
9542 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9543 | mutex_unlock(&ctx->uring_lock); |
9544 | ||
3dd0c97a PB |
9545 | io_kill_timeouts(ctx, NULL, true); |
9546 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9547 | |
15dff286 | 9548 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9549 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9550 | |
85faa7b8 | 9551 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9552 | /* |
9553 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9554 | * if we're exiting a ton of rings at the same time. It just adds | |
9555 | * noise and overhead, there's no discernable change in runtime | |
9556 | * over using system_wq. | |
9557 | */ | |
9558 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9559 | } |
9560 | ||
9561 | static int io_uring_release(struct inode *inode, struct file *file) | |
9562 | { | |
9563 | struct io_ring_ctx *ctx = file->private_data; | |
9564 | ||
9565 | file->private_data = NULL; | |
9566 | io_ring_ctx_wait_and_kill(ctx); | |
9567 | return 0; | |
9568 | } | |
9569 | ||
f6edbabb PB |
9570 | struct io_task_cancel { |
9571 | struct task_struct *task; | |
3dd0c97a | 9572 | bool all; |
f6edbabb | 9573 | }; |
f254ac04 | 9574 | |
f6edbabb | 9575 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9576 | { |
9a472ef7 | 9577 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9578 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
9579 | bool ret; |
9580 | ||
3dd0c97a | 9581 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
9582 | struct io_ring_ctx *ctx = req->ctx; |
9583 | ||
9584 | /* protect against races with linked timeouts */ | |
79ebeaee | 9585 | spin_lock(&ctx->completion_lock); |
3dd0c97a | 9586 | ret = io_match_task(req, cancel->task, cancel->all); |
79ebeaee | 9587 | spin_unlock(&ctx->completion_lock); |
9a472ef7 | 9588 | } else { |
3dd0c97a | 9589 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
9590 | } |
9591 | return ret; | |
b711d4ea JA |
9592 | } |
9593 | ||
c072481d PB |
9594 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
9595 | struct task_struct *task, | |
9596 | bool cancel_all) | |
b7ddce3c | 9597 | { |
e1915f76 | 9598 | struct io_defer_entry *de; |
b7ddce3c PB |
9599 | LIST_HEAD(list); |
9600 | ||
79ebeaee | 9601 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9602 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
3dd0c97a | 9603 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
9604 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9605 | break; | |
9606 | } | |
9607 | } | |
79ebeaee | 9608 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9609 | if (list_empty(&list)) |
9610 | return false; | |
b7ddce3c PB |
9611 | |
9612 | while (!list_empty(&list)) { | |
9613 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9614 | list_del_init(&de->list); | |
f41db273 | 9615 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9616 | kfree(de); |
9617 | } | |
e1915f76 | 9618 | return true; |
b7ddce3c PB |
9619 | } |
9620 | ||
c072481d | 9621 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
9622 | { |
9623 | struct io_tctx_node *node; | |
9624 | enum io_wq_cancel cret; | |
9625 | bool ret = false; | |
9626 | ||
9627 | mutex_lock(&ctx->uring_lock); | |
9628 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9629 | struct io_uring_task *tctx = node->task->io_uring; | |
9630 | ||
9631 | /* | |
9632 | * io_wq will stay alive while we hold uring_lock, because it's | |
9633 | * killed after ctx nodes, which requires to take the lock. | |
9634 | */ | |
9635 | if (!tctx || !tctx->io_wq) | |
9636 | continue; | |
9637 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9638 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9639 | } | |
9640 | mutex_unlock(&ctx->uring_lock); | |
9641 | ||
9642 | return ret; | |
9643 | } | |
9644 | ||
c072481d PB |
9645 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9646 | struct task_struct *task, | |
9647 | bool cancel_all) | |
9936c7c2 | 9648 | { |
3dd0c97a | 9649 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9650 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9651 | |
9652 | while (1) { | |
9653 | enum io_wq_cancel cret; | |
9654 | bool ret = false; | |
9655 | ||
1b00764f PB |
9656 | if (!task) { |
9657 | ret |= io_uring_try_cancel_iowq(ctx); | |
9658 | } else if (tctx && tctx->io_wq) { | |
9659 | /* | |
9660 | * Cancels requests of all rings, not only @ctx, but | |
9661 | * it's fine as the task is in exit/exec. | |
9662 | */ | |
5aa75ed5 | 9663 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9664 | &cancel, true); |
9665 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9666 | } | |
9667 | ||
9668 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9669 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9670 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 9671 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
9672 | io_iopoll_try_reap_events(ctx); |
9673 | ret = true; | |
9674 | } | |
9675 | } | |
9676 | ||
3dd0c97a PB |
9677 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9678 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9679 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9680 | if (task) |
9681 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9682 | if (!ret) |
9683 | break; | |
9684 | cond_resched(); | |
9685 | } | |
9686 | } | |
9687 | ||
eef51daa | 9688 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9689 | { |
236434c3 | 9690 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9691 | struct io_tctx_node *node; |
a528b04e | 9692 | int ret; |
236434c3 MWO |
9693 | |
9694 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9695 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9696 | if (unlikely(ret)) |
9697 | return ret; | |
e139a1ec | 9698 | |
236434c3 | 9699 | tctx = current->io_uring; |
e139a1ec PB |
9700 | if (ctx->iowq_limits_set) { |
9701 | unsigned int limits[2] = { ctx->iowq_limits[0], | |
9702 | ctx->iowq_limits[1], }; | |
9703 | ||
9704 | ret = io_wq_max_workers(tctx->io_wq, limits); | |
9705 | if (ret) | |
9706 | return ret; | |
9707 | } | |
0f212204 | 9708 | } |
cf27f3b1 PB |
9709 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9710 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9711 | if (!node) | |
9712 | return -ENOMEM; | |
9713 | node->ctx = ctx; | |
9714 | node->task = current; | |
13bf43f5 | 9715 | |
cf27f3b1 PB |
9716 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9717 | node, GFP_KERNEL)); | |
9718 | if (ret) { | |
9719 | kfree(node); | |
9720 | return ret; | |
0f212204 | 9721 | } |
cf27f3b1 PB |
9722 | |
9723 | mutex_lock(&ctx->uring_lock); | |
9724 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9725 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9726 | } |
cf27f3b1 | 9727 | tctx->last = ctx; |
0f212204 JA |
9728 | return 0; |
9729 | } | |
9730 | ||
cf27f3b1 PB |
9731 | /* |
9732 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9733 | */ | |
eef51daa | 9734 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9735 | { |
9736 | struct io_uring_task *tctx = current->io_uring; | |
9737 | ||
9738 | if (likely(tctx && tctx->last == ctx)) | |
9739 | return 0; | |
eef51daa | 9740 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9741 | } |
9742 | ||
0f212204 JA |
9743 | /* |
9744 | * Remove this io_uring_file -> task mapping. | |
9745 | */ | |
c072481d | 9746 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9747 | { |
9748 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9749 | struct io_tctx_node *node; |
2941267b | 9750 | |
eebd2e37 PB |
9751 | if (!tctx) |
9752 | return; | |
13bf43f5 PB |
9753 | node = xa_erase(&tctx->xa, index); |
9754 | if (!node) | |
2941267b | 9755 | return; |
0f212204 | 9756 | |
13bf43f5 PB |
9757 | WARN_ON_ONCE(current != node->task); |
9758 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9759 | ||
9760 | mutex_lock(&node->ctx->uring_lock); | |
9761 | list_del(&node->ctx_node); | |
9762 | mutex_unlock(&node->ctx->uring_lock); | |
9763 | ||
baf186c4 | 9764 | if (tctx->last == node->ctx) |
0f212204 | 9765 | tctx->last = NULL; |
13bf43f5 | 9766 | kfree(node); |
0f212204 JA |
9767 | } |
9768 | ||
c072481d | 9769 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9770 | { |
ba5ef6dc | 9771 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9772 | struct io_tctx_node *node; |
de7f1d9e PB |
9773 | unsigned long index; |
9774 | ||
8bab4c09 | 9775 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 9776 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
9777 | cond_resched(); |
9778 | } | |
b16ef427 ME |
9779 | if (wq) { |
9780 | /* | |
9781 | * Must be after io_uring_del_task_file() (removes nodes under | |
9782 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9783 | */ | |
ba5ef6dc | 9784 | io_wq_put_and_exit(wq); |
dadebc35 | 9785 | tctx->io_wq = NULL; |
b16ef427 | 9786 | } |
de7f1d9e PB |
9787 | } |
9788 | ||
3f48cf18 | 9789 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9790 | { |
3f48cf18 PB |
9791 | if (tracked) |
9792 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9793 | return percpu_counter_sum(&tctx->inflight); |
9794 | } | |
9795 | ||
c072481d | 9796 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
09899b19 PB |
9797 | { |
9798 | struct io_uring_task *tctx = task->io_uring; | |
9799 | unsigned int refs = tctx->cached_refs; | |
9800 | ||
e9dbe221 PB |
9801 | if (refs) { |
9802 | tctx->cached_refs = 0; | |
9803 | percpu_counter_sub(&tctx->inflight, refs); | |
9804 | put_task_struct_many(task, refs); | |
9805 | } | |
09899b19 PB |
9806 | } |
9807 | ||
78cc687b PB |
9808 | /* |
9809 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9810 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9811 | */ | |
c072481d PB |
9812 | static __cold void io_uring_cancel_generic(bool cancel_all, |
9813 | struct io_sq_data *sqd) | |
0e9ddb39 | 9814 | { |
521d6a73 | 9815 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9816 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9817 | s64 inflight; |
9818 | DEFINE_WAIT(wait); | |
fdaf083c | 9819 | |
78cc687b PB |
9820 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9821 | ||
6d042ffb PO |
9822 | if (!current->io_uring) |
9823 | return; | |
17a91051 PB |
9824 | if (tctx->io_wq) |
9825 | io_wq_exit_start(tctx->io_wq); | |
9826 | ||
0e9ddb39 PB |
9827 | atomic_inc(&tctx->in_idle); |
9828 | do { | |
e9dbe221 | 9829 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9830 | /* read completions before cancelations */ |
78cc687b | 9831 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9832 | if (!inflight) |
9833 | break; | |
fdaf083c | 9834 | |
78cc687b PB |
9835 | if (!sqd) { |
9836 | struct io_tctx_node *node; | |
9837 | unsigned long index; | |
0f212204 | 9838 | |
78cc687b PB |
9839 | xa_for_each(&tctx->xa, index, node) { |
9840 | /* sqpoll task will cancel all its requests */ | |
9841 | if (node->ctx->sq_data) | |
9842 | continue; | |
9843 | io_uring_try_cancel_requests(node->ctx, current, | |
9844 | cancel_all); | |
9845 | } | |
9846 | } else { | |
9847 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9848 | io_uring_try_cancel_requests(ctx, current, | |
9849 | cancel_all); | |
9850 | } | |
17a91051 | 9851 | |
0f212204 | 9852 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9853 | io_uring_drop_tctx_refs(current); |
0f212204 | 9854 | /* |
a1bb3cd5 PB |
9855 | * If we've seen completions, retry without waiting. This |
9856 | * avoids a race where a completion comes in before we did | |
9857 | * prepare_to_wait(). | |
0f212204 | 9858 | */ |
3dd0c97a | 9859 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9860 | schedule(); |
f57555ed | 9861 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9862 | } while (1); |
fdaf083c | 9863 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9864 | |
8452d4a6 | 9865 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9866 | if (cancel_all) { |
3f48cf18 PB |
9867 | /* for exec all current's requests should be gone, kill tctx */ |
9868 | __io_uring_free(current); | |
9869 | } | |
44e728b8 PB |
9870 | } |
9871 | ||
f552a27a | 9872 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9873 | { |
f552a27a | 9874 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9875 | } |
9876 | ||
6c5c240e RP |
9877 | static void *io_uring_validate_mmap_request(struct file *file, |
9878 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9879 | { |
2b188cc1 | 9880 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9881 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9882 | struct page *page; |
9883 | void *ptr; | |
9884 | ||
9885 | switch (offset) { | |
9886 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9887 | case IORING_OFF_CQ_RING: |
9888 | ptr = ctx->rings; | |
2b188cc1 JA |
9889 | break; |
9890 | case IORING_OFF_SQES: | |
9891 | ptr = ctx->sq_sqes; | |
9892 | break; | |
2b188cc1 | 9893 | default: |
6c5c240e | 9894 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9895 | } |
9896 | ||
9897 | page = virt_to_head_page(ptr); | |
a50b854e | 9898 | if (sz > page_size(page)) |
6c5c240e RP |
9899 | return ERR_PTR(-EINVAL); |
9900 | ||
9901 | return ptr; | |
9902 | } | |
9903 | ||
9904 | #ifdef CONFIG_MMU | |
9905 | ||
c072481d | 9906 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
9907 | { |
9908 | size_t sz = vma->vm_end - vma->vm_start; | |
9909 | unsigned long pfn; | |
9910 | void *ptr; | |
9911 | ||
9912 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9913 | if (IS_ERR(ptr)) | |
9914 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9915 | |
9916 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9917 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9918 | } | |
9919 | ||
6c5c240e RP |
9920 | #else /* !CONFIG_MMU */ |
9921 | ||
9922 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9923 | { | |
9924 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9925 | } | |
9926 | ||
9927 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9928 | { | |
9929 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9930 | } | |
9931 | ||
9932 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9933 | unsigned long addr, unsigned long len, | |
9934 | unsigned long pgoff, unsigned long flags) | |
9935 | { | |
9936 | void *ptr; | |
9937 | ||
9938 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9939 | if (IS_ERR(ptr)) | |
9940 | return PTR_ERR(ptr); | |
9941 | ||
9942 | return (unsigned long) ptr; | |
9943 | } | |
9944 | ||
9945 | #endif /* !CONFIG_MMU */ | |
9946 | ||
d9d05217 | 9947 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9948 | { |
9949 | DEFINE_WAIT(wait); | |
9950 | ||
9951 | do { | |
9952 | if (!io_sqring_full(ctx)) | |
9953 | break; | |
90554200 JA |
9954 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9955 | ||
9956 | if (!io_sqring_full(ctx)) | |
9957 | break; | |
90554200 JA |
9958 | schedule(); |
9959 | } while (!signal_pending(current)); | |
9960 | ||
9961 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9962 | return 0; |
90554200 JA |
9963 | } |
9964 | ||
c73ebb68 HX |
9965 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9966 | struct __kernel_timespec __user **ts, | |
9967 | const sigset_t __user **sig) | |
9968 | { | |
9969 | struct io_uring_getevents_arg arg; | |
9970 | ||
9971 | /* | |
9972 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9973 | * is just a pointer to the sigset_t. | |
9974 | */ | |
9975 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9976 | *sig = (const sigset_t __user *) argp; | |
9977 | *ts = NULL; | |
9978 | return 0; | |
9979 | } | |
9980 | ||
9981 | /* | |
9982 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9983 | * timespec and sigset_t pointers if good. | |
9984 | */ | |
9985 | if (*argsz != sizeof(arg)) | |
9986 | return -EINVAL; | |
9987 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9988 | return -EFAULT; | |
9989 | *sig = u64_to_user_ptr(arg.sigmask); | |
9990 | *argsz = arg.sigmask_sz; | |
9991 | *ts = u64_to_user_ptr(arg.ts); | |
9992 | return 0; | |
9993 | } | |
9994 | ||
2b188cc1 | 9995 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9996 | u32, min_complete, u32, flags, const void __user *, argp, |
9997 | size_t, argsz) | |
2b188cc1 JA |
9998 | { |
9999 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
10000 | int submitted = 0; |
10001 | struct fd f; | |
33f993da | 10002 | long ret; |
2b188cc1 | 10003 | |
4c6e277c | 10004 | io_run_task_work(); |
b41e9852 | 10005 | |
33f993da PB |
10006 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
10007 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
10008 | return -EINVAL; |
10009 | ||
10010 | f = fdget(fd); | |
33f993da | 10011 | if (unlikely(!f.file)) |
2b188cc1 JA |
10012 | return -EBADF; |
10013 | ||
10014 | ret = -EOPNOTSUPP; | |
33f993da | 10015 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
10016 | goto out_fput; |
10017 | ||
10018 | ret = -ENXIO; | |
10019 | ctx = f.file->private_data; | |
33f993da | 10020 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
10021 | goto out_fput; |
10022 | ||
7e84e1c7 | 10023 | ret = -EBADFD; |
33f993da | 10024 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
10025 | goto out; |
10026 | ||
6c271ce2 JA |
10027 | /* |
10028 | * For SQ polling, the thread will do all submissions and completions. | |
10029 | * Just return the requested submit count, and wake the thread if | |
10030 | * we were asked to. | |
10031 | */ | |
b2a9eada | 10032 | ret = 0; |
6c271ce2 | 10033 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 10034 | io_cqring_overflow_flush(ctx); |
89448c47 | 10035 | |
21f96522 JA |
10036 | if (unlikely(ctx->sq_data->thread == NULL)) { |
10037 | ret = -EOWNERDEAD; | |
04147488 | 10038 | goto out; |
21f96522 | 10039 | } |
6c271ce2 | 10040 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 10041 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
10042 | if (flags & IORING_ENTER_SQ_WAIT) { |
10043 | ret = io_sqpoll_wait_sq(ctx); | |
10044 | if (ret) | |
10045 | goto out; | |
10046 | } | |
6c271ce2 | 10047 | submitted = to_submit; |
b2a9eada | 10048 | } else if (to_submit) { |
eef51daa | 10049 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
10050 | if (unlikely(ret)) |
10051 | goto out; | |
2b188cc1 | 10052 | mutex_lock(&ctx->uring_lock); |
0f212204 | 10053 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 10054 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
10055 | |
10056 | if (submitted != to_submit) | |
10057 | goto out; | |
2b188cc1 JA |
10058 | } |
10059 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
10060 | const sigset_t __user *sig; |
10061 | struct __kernel_timespec __user *ts; | |
10062 | ||
10063 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
10064 | if (unlikely(ret)) | |
10065 | goto out; | |
10066 | ||
2b188cc1 JA |
10067 | min_complete = min(min_complete, ctx->cq_entries); |
10068 | ||
32b2244a XW |
10069 | /* |
10070 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
10071 | * space applications don't need to do io completion events | |
10072 | * polling again, they can rely on io_sq_thread to do polling | |
10073 | * work, which can reduce cpu usage and uring_lock contention. | |
10074 | */ | |
10075 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
10076 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 10077 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 10078 | } else { |
c73ebb68 | 10079 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 10080 | } |
2b188cc1 JA |
10081 | } |
10082 | ||
7c504e65 | 10083 | out: |
6805b32e | 10084 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
10085 | out_fput: |
10086 | fdput(f); | |
10087 | return submitted ? submitted : ret; | |
10088 | } | |
10089 | ||
bebdb65e | 10090 | #ifdef CONFIG_PROC_FS |
c072481d | 10091 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 10092 | const struct cred *cred) |
87ce955b | 10093 | { |
87ce955b JA |
10094 | struct user_namespace *uns = seq_user_ns(m); |
10095 | struct group_info *gi; | |
10096 | kernel_cap_t cap; | |
10097 | unsigned __capi; | |
10098 | int g; | |
10099 | ||
10100 | seq_printf(m, "%5d\n", id); | |
10101 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
10102 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
10103 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
10104 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10105 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10106 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10107 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10108 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10109 | seq_puts(m, "\n\tGroups:\t"); | |
10110 | gi = cred->group_info; | |
10111 | for (g = 0; g < gi->ngroups; g++) { | |
10112 | seq_put_decimal_ull(m, g ? " " : "", | |
10113 | from_kgid_munged(uns, gi->gid[g])); | |
10114 | } | |
10115 | seq_puts(m, "\n\tCapEff:\t"); | |
10116 | cap = cred->cap_effective; | |
10117 | CAP_FOR_EACH_U32(__capi) | |
10118 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10119 | seq_putc(m, '\n'); | |
10120 | return 0; | |
10121 | } | |
10122 | ||
c072481d PB |
10123 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
10124 | struct seq_file *m) | |
87ce955b | 10125 | { |
dbbe9c64 | 10126 | struct io_sq_data *sq = NULL; |
83f84356 HX |
10127 | struct io_overflow_cqe *ocqe; |
10128 | struct io_rings *r = ctx->rings; | |
10129 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
83f84356 HX |
10130 | unsigned int sq_head = READ_ONCE(r->sq.head); |
10131 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
10132 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
10133 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
f75d1183 | 10134 | unsigned int sq_entries, cq_entries; |
fad8e0de | 10135 | bool has_lock; |
83f84356 HX |
10136 | unsigned int i; |
10137 | ||
10138 | /* | |
10139 | * we may get imprecise sqe and cqe info if uring is actively running | |
10140 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
10141 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
10142 | * we usually use these info when it is stuck. | |
10143 | */ | |
f75d1183 JA |
10144 | seq_printf(m, "SqMask:\t\t0x%x\n", sq_mask); |
10145 | seq_printf(m, "SqHead:\t%u\n", sq_head); | |
10146 | seq_printf(m, "SqTail:\t%u\n", sq_tail); | |
10147 | seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head); | |
10148 | seq_printf(m, "CqMask:\t0x%x\n", cq_mask); | |
10149 | seq_printf(m, "CqHead:\t%u\n", cq_head); | |
10150 | seq_printf(m, "CqTail:\t%u\n", cq_tail); | |
10151 | seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail); | |
10152 | seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head); | |
10153 | sq_entries = min(sq_tail - sq_head, ctx->sq_entries); | |
10154 | for (i = 0; i < sq_entries; i++) { | |
10155 | unsigned int entry = i + sq_head; | |
10156 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); | |
a1957780 | 10157 | struct io_uring_sqe *sqe; |
f75d1183 JA |
10158 | |
10159 | if (sq_idx > sq_mask) | |
10160 | continue; | |
10161 | sqe = &ctx->sq_sqes[sq_idx]; | |
10162 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
10163 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, | |
10164 | sqe->user_data); | |
83f84356 | 10165 | } |
f75d1183 JA |
10166 | seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); |
10167 | cq_entries = min(cq_tail - cq_head, ctx->cq_entries); | |
10168 | for (i = 0; i < cq_entries; i++) { | |
10169 | unsigned int entry = i + cq_head; | |
10170 | struct io_uring_cqe *cqe = &r->cqes[entry & cq_mask]; | |
83f84356 HX |
10171 | |
10172 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
f75d1183 JA |
10173 | entry & cq_mask, cqe->user_data, cqe->res, |
10174 | cqe->flags); | |
83f84356 | 10175 | } |
87ce955b | 10176 | |
fad8e0de JA |
10177 | /* |
10178 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10179 | * since fdinfo case grabs it in the opposite direction of normal use | |
10180 | * cases. If we fail to get the lock, we just don't iterate any | |
10181 | * structures that could be going away outside the io_uring mutex. | |
10182 | */ | |
10183 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10184 | ||
5f3f26f9 | 10185 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10186 | sq = ctx->sq_data; |
5f3f26f9 JA |
10187 | if (!sq->thread) |
10188 | sq = NULL; | |
10189 | } | |
dbbe9c64 JQ |
10190 | |
10191 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10192 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10193 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10194 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10195 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10196 | |
87ce955b JA |
10197 | if (f) |
10198 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10199 | else | |
10200 | seq_printf(m, "%5u: <none>\n", i); | |
10201 | } | |
10202 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10203 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10204 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10205 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10206 | |
4751f53d | 10207 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10208 | } |
61cf9370 MWO |
10209 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10210 | unsigned long index; | |
10211 | const struct cred *cred; | |
10212 | ||
87ce955b | 10213 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10214 | xa_for_each(&ctx->personalities, index, cred) |
10215 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10216 | } |
83f84356 HX |
10217 | if (has_lock) |
10218 | mutex_unlock(&ctx->uring_lock); | |
10219 | ||
10220 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 10221 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10222 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10223 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10224 | struct io_kiocb *req; | |
10225 | ||
10226 | hlist_for_each_entry(req, list, hash_node) | |
10227 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
10228 | req->task->task_works != NULL); | |
10229 | } | |
83f84356 HX |
10230 | |
10231 | seq_puts(m, "CqOverflowList:\n"); | |
10232 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
10233 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
10234 | ||
10235 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
10236 | cqe->user_data, cqe->res, cqe->flags); | |
10237 | ||
10238 | } | |
10239 | ||
79ebeaee | 10240 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
10241 | } |
10242 | ||
c072481d | 10243 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
10244 | { |
10245 | struct io_ring_ctx *ctx = f->private_data; | |
10246 | ||
10247 | if (percpu_ref_tryget(&ctx->refs)) { | |
10248 | __io_uring_show_fdinfo(ctx, m); | |
10249 | percpu_ref_put(&ctx->refs); | |
10250 | } | |
10251 | } | |
bebdb65e | 10252 | #endif |
87ce955b | 10253 | |
2b188cc1 JA |
10254 | static const struct file_operations io_uring_fops = { |
10255 | .release = io_uring_release, | |
10256 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10257 | #ifndef CONFIG_MMU |
10258 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10259 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10260 | #endif | |
2b188cc1 | 10261 | .poll = io_uring_poll, |
bebdb65e | 10262 | #ifdef CONFIG_PROC_FS |
87ce955b | 10263 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10264 | #endif |
2b188cc1 JA |
10265 | }; |
10266 | ||
c072481d PB |
10267 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
10268 | struct io_uring_params *p) | |
2b188cc1 | 10269 | { |
75b28aff HV |
10270 | struct io_rings *rings; |
10271 | size_t size, sq_array_offset; | |
2b188cc1 | 10272 | |
bd740481 JA |
10273 | /* make sure these are sane, as we already accounted them */ |
10274 | ctx->sq_entries = p->sq_entries; | |
10275 | ctx->cq_entries = p->cq_entries; | |
10276 | ||
75b28aff HV |
10277 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10278 | if (size == SIZE_MAX) | |
10279 | return -EOVERFLOW; | |
10280 | ||
10281 | rings = io_mem_alloc(size); | |
10282 | if (!rings) | |
2b188cc1 JA |
10283 | return -ENOMEM; |
10284 | ||
75b28aff HV |
10285 | ctx->rings = rings; |
10286 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
10287 | rings->sq_ring_mask = p->sq_entries - 1; | |
10288 | rings->cq_ring_mask = p->cq_entries - 1; | |
10289 | rings->sq_ring_entries = p->sq_entries; | |
10290 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
10291 | |
10292 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
10293 | if (size == SIZE_MAX) { |
10294 | io_mem_free(ctx->rings); | |
10295 | ctx->rings = NULL; | |
2b188cc1 | 10296 | return -EOVERFLOW; |
eb065d30 | 10297 | } |
2b188cc1 JA |
10298 | |
10299 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
10300 | if (!ctx->sq_sqes) { |
10301 | io_mem_free(ctx->rings); | |
10302 | ctx->rings = NULL; | |
2b188cc1 | 10303 | return -ENOMEM; |
eb065d30 | 10304 | } |
2b188cc1 | 10305 | |
2b188cc1 JA |
10306 | return 0; |
10307 | } | |
10308 | ||
9faadcc8 PB |
10309 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
10310 | { | |
10311 | int ret, fd; | |
10312 | ||
10313 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
10314 | if (fd < 0) | |
10315 | return fd; | |
10316 | ||
eef51daa | 10317 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
10318 | if (ret) { |
10319 | put_unused_fd(fd); | |
10320 | return ret; | |
10321 | } | |
10322 | fd_install(fd, file); | |
10323 | return fd; | |
10324 | } | |
10325 | ||
2b188cc1 JA |
10326 | /* |
10327 | * Allocate an anonymous fd, this is what constitutes the application | |
10328 | * visible backing of an io_uring instance. The application mmaps this | |
10329 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
10330 | * we have to tie this fd to a socket for file garbage collection purposes. | |
10331 | */ | |
9faadcc8 | 10332 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
10333 | { |
10334 | struct file *file; | |
9faadcc8 | 10335 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
10336 | int ret; |
10337 | ||
2b188cc1 JA |
10338 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
10339 | &ctx->ring_sock); | |
10340 | if (ret) | |
9faadcc8 | 10341 | return ERR_PTR(ret); |
2b188cc1 JA |
10342 | #endif |
10343 | ||
91a9ab7c PM |
10344 | file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx, |
10345 | O_RDWR | O_CLOEXEC, NULL); | |
2b188cc1 | 10346 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
10347 | if (IS_ERR(file)) { |
10348 | sock_release(ctx->ring_sock); | |
10349 | ctx->ring_sock = NULL; | |
10350 | } else { | |
10351 | ctx->ring_sock->file = file; | |
0f212204 | 10352 | } |
2b188cc1 | 10353 | #endif |
9faadcc8 | 10354 | return file; |
2b188cc1 JA |
10355 | } |
10356 | ||
c072481d PB |
10357 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
10358 | struct io_uring_params __user *params) | |
2b188cc1 | 10359 | { |
2b188cc1 | 10360 | struct io_ring_ctx *ctx; |
9faadcc8 | 10361 | struct file *file; |
2b188cc1 JA |
10362 | int ret; |
10363 | ||
8110c1a6 | 10364 | if (!entries) |
2b188cc1 | 10365 | return -EINVAL; |
8110c1a6 JA |
10366 | if (entries > IORING_MAX_ENTRIES) { |
10367 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10368 | return -EINVAL; | |
10369 | entries = IORING_MAX_ENTRIES; | |
10370 | } | |
2b188cc1 JA |
10371 | |
10372 | /* | |
10373 | * Use twice as many entries for the CQ ring. It's possible for the | |
10374 | * application to drive a higher depth than the size of the SQ ring, | |
10375 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
10376 | * some flexibility in overcommitting a bit. If the application has |
10377 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
10378 | * of CQ ring entries manually. | |
2b188cc1 JA |
10379 | */ |
10380 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
10381 | if (p->flags & IORING_SETUP_CQSIZE) { |
10382 | /* | |
10383 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
10384 | * to a power-of-two, if it isn't already. We do NOT impose | |
10385 | * any cq vs sq ring sizing. | |
10386 | */ | |
eb2667b3 | 10387 | if (!p->cq_entries) |
33a107f0 | 10388 | return -EINVAL; |
8110c1a6 JA |
10389 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
10390 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10391 | return -EINVAL; | |
10392 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
10393 | } | |
eb2667b3 JQ |
10394 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
10395 | if (p->cq_entries < p->sq_entries) | |
10396 | return -EINVAL; | |
33a107f0 JA |
10397 | } else { |
10398 | p->cq_entries = 2 * p->sq_entries; | |
10399 | } | |
2b188cc1 | 10400 | |
2b188cc1 | 10401 | ctx = io_ring_ctx_alloc(p); |
62e398be | 10402 | if (!ctx) |
2b188cc1 | 10403 | return -ENOMEM; |
2b188cc1 | 10404 | ctx->compat = in_compat_syscall(); |
62e398be JA |
10405 | if (!capable(CAP_IPC_LOCK)) |
10406 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
10407 | |
10408 | /* | |
10409 | * This is just grabbed for accounting purposes. When a process exits, | |
10410 | * the mm is exited and dropped before the files, hence we need to hang | |
10411 | * on to this mm purely for the purposes of being able to unaccount | |
10412 | * memory (locked/pinned vm). It's not used for anything else. | |
10413 | */ | |
6b7898eb | 10414 | mmgrab(current->mm); |
2aede0e4 | 10415 | ctx->mm_account = current->mm; |
6b7898eb | 10416 | |
2b188cc1 JA |
10417 | ret = io_allocate_scq_urings(ctx, p); |
10418 | if (ret) | |
10419 | goto err; | |
10420 | ||
7e84e1c7 | 10421 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
10422 | if (ret) |
10423 | goto err; | |
eae071c9 | 10424 | /* always set a rsrc node */ |
47b228ce PB |
10425 | ret = io_rsrc_node_switch_start(ctx); |
10426 | if (ret) | |
10427 | goto err; | |
eae071c9 | 10428 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 10429 | |
2b188cc1 | 10430 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
10431 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
10432 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
10433 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
10434 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
10435 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
10436 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
10437 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
10438 | |
10439 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
10440 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
10441 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
10442 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
10443 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
10444 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
10445 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 10446 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 10447 | |
7f13657d XW |
10448 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
10449 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 10450 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 10451 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e | 10452 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
04c76b41 | 10453 | IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP; |
7f13657d XW |
10454 | |
10455 | if (copy_to_user(params, p, sizeof(*p))) { | |
10456 | ret = -EFAULT; | |
10457 | goto err; | |
10458 | } | |
d1719f70 | 10459 | |
9faadcc8 PB |
10460 | file = io_uring_get_file(ctx); |
10461 | if (IS_ERR(file)) { | |
10462 | ret = PTR_ERR(file); | |
10463 | goto err; | |
10464 | } | |
10465 | ||
044c1ab3 JA |
10466 | /* |
10467 | * Install ring fd as the very last thing, so we don't risk someone | |
10468 | * having closed it before we finish setup | |
10469 | */ | |
9faadcc8 PB |
10470 | ret = io_uring_install_fd(ctx, file); |
10471 | if (ret < 0) { | |
10472 | /* fput will clean it up */ | |
10473 | fput(file); | |
10474 | return ret; | |
10475 | } | |
044c1ab3 | 10476 | |
c826bd7a | 10477 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10478 | return ret; |
10479 | err: | |
10480 | io_ring_ctx_wait_and_kill(ctx); | |
10481 | return ret; | |
10482 | } | |
10483 | ||
10484 | /* | |
10485 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10486 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10487 | * params structure passed in. | |
10488 | */ | |
10489 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10490 | { | |
10491 | struct io_uring_params p; | |
2b188cc1 JA |
10492 | int i; |
10493 | ||
10494 | if (copy_from_user(&p, params, sizeof(p))) | |
10495 | return -EFAULT; | |
10496 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10497 | if (p.resv[i]) | |
10498 | return -EINVAL; | |
10499 | } | |
10500 | ||
6c271ce2 | 10501 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10502 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10503 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10504 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10505 | return -EINVAL; |
10506 | ||
7f13657d | 10507 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10508 | } |
10509 | ||
10510 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10511 | struct io_uring_params __user *, params) | |
10512 | { | |
10513 | return io_uring_setup(entries, params); | |
10514 | } | |
10515 | ||
c072481d PB |
10516 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
10517 | unsigned nr_args) | |
66f4af93 JA |
10518 | { |
10519 | struct io_uring_probe *p; | |
10520 | size_t size; | |
10521 | int i, ret; | |
10522 | ||
10523 | size = struct_size(p, ops, nr_args); | |
10524 | if (size == SIZE_MAX) | |
10525 | return -EOVERFLOW; | |
10526 | p = kzalloc(size, GFP_KERNEL); | |
10527 | if (!p) | |
10528 | return -ENOMEM; | |
10529 | ||
10530 | ret = -EFAULT; | |
10531 | if (copy_from_user(p, arg, size)) | |
10532 | goto out; | |
10533 | ret = -EINVAL; | |
10534 | if (memchr_inv(p, 0, size)) | |
10535 | goto out; | |
10536 | ||
10537 | p->last_op = IORING_OP_LAST - 1; | |
10538 | if (nr_args > IORING_OP_LAST) | |
10539 | nr_args = IORING_OP_LAST; | |
10540 | ||
10541 | for (i = 0; i < nr_args; i++) { | |
10542 | p->ops[i].op = i; | |
10543 | if (!io_op_defs[i].not_supported) | |
10544 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10545 | } | |
10546 | p->ops_len = i; | |
10547 | ||
10548 | ret = 0; | |
10549 | if (copy_to_user(arg, p, size)) | |
10550 | ret = -EFAULT; | |
10551 | out: | |
10552 | kfree(p); | |
10553 | return ret; | |
10554 | } | |
10555 | ||
071698e1 JA |
10556 | static int io_register_personality(struct io_ring_ctx *ctx) |
10557 | { | |
4379bf8b | 10558 | const struct cred *creds; |
61cf9370 | 10559 | u32 id; |
1e6fa521 | 10560 | int ret; |
071698e1 | 10561 | |
4379bf8b | 10562 | creds = get_current_cred(); |
1e6fa521 | 10563 | |
61cf9370 MWO |
10564 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10565 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10566 | if (ret < 0) { |
10567 | put_cred(creds); | |
10568 | return ret; | |
10569 | } | |
10570 | return id; | |
071698e1 JA |
10571 | } |
10572 | ||
c072481d PB |
10573 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
10574 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
10575 | { |
10576 | struct io_uring_restriction *res; | |
10577 | size_t size; | |
10578 | int i, ret; | |
10579 | ||
7e84e1c7 SG |
10580 | /* Restrictions allowed only if rings started disabled */ |
10581 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10582 | return -EBADFD; | |
10583 | ||
21b55dbc | 10584 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10585 | if (ctx->restrictions.registered) |
21b55dbc SG |
10586 | return -EBUSY; |
10587 | ||
10588 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10589 | return -EINVAL; | |
10590 | ||
10591 | size = array_size(nr_args, sizeof(*res)); | |
10592 | if (size == SIZE_MAX) | |
10593 | return -EOVERFLOW; | |
10594 | ||
10595 | res = memdup_user(arg, size); | |
10596 | if (IS_ERR(res)) | |
10597 | return PTR_ERR(res); | |
10598 | ||
10599 | ret = 0; | |
10600 | ||
10601 | for (i = 0; i < nr_args; i++) { | |
10602 | switch (res[i].opcode) { | |
10603 | case IORING_RESTRICTION_REGISTER_OP: | |
10604 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10605 | ret = -EINVAL; | |
10606 | goto out; | |
10607 | } | |
10608 | ||
10609 | __set_bit(res[i].register_op, | |
10610 | ctx->restrictions.register_op); | |
10611 | break; | |
10612 | case IORING_RESTRICTION_SQE_OP: | |
10613 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10614 | ret = -EINVAL; | |
10615 | goto out; | |
10616 | } | |
10617 | ||
10618 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10619 | break; | |
10620 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10621 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10622 | break; | |
10623 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10624 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10625 | break; | |
10626 | default: | |
10627 | ret = -EINVAL; | |
10628 | goto out; | |
10629 | } | |
10630 | } | |
10631 | ||
10632 | out: | |
10633 | /* Reset all restrictions if an error happened */ | |
10634 | if (ret != 0) | |
10635 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10636 | else | |
7e84e1c7 | 10637 | ctx->restrictions.registered = true; |
21b55dbc SG |
10638 | |
10639 | kfree(res); | |
10640 | return ret; | |
10641 | } | |
10642 | ||
7e84e1c7 SG |
10643 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10644 | { | |
10645 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10646 | return -EBADFD; | |
10647 | ||
10648 | if (ctx->restrictions.registered) | |
10649 | ctx->restricted = 1; | |
10650 | ||
0298ef96 PB |
10651 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10652 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10653 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10654 | return 0; |
10655 | } | |
10656 | ||
fdecb662 | 10657 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10658 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10659 | unsigned nr_args) |
10660 | { | |
10661 | __u32 tmp; | |
10662 | int err; | |
10663 | ||
c3bdad02 PB |
10664 | if (up->resv) |
10665 | return -EINVAL; | |
98f0b3b4 PB |
10666 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10667 | return -EOVERFLOW; | |
10668 | err = io_rsrc_node_switch_start(ctx); | |
10669 | if (err) | |
10670 | return err; | |
10671 | ||
fdecb662 PB |
10672 | switch (type) { |
10673 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10674 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10675 | case IORING_RSRC_BUFFER: |
10676 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10677 | } |
10678 | return -EINVAL; | |
10679 | } | |
10680 | ||
c3bdad02 PB |
10681 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10682 | unsigned nr_args) | |
98f0b3b4 | 10683 | { |
c3bdad02 | 10684 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10685 | |
10686 | if (!nr_args) | |
10687 | return -EINVAL; | |
c3bdad02 PB |
10688 | memset(&up, 0, sizeof(up)); |
10689 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10690 | return -EFAULT; | |
10691 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10692 | } | |
10693 | ||
10694 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10695 | unsigned size, unsigned type) |
c3bdad02 PB |
10696 | { |
10697 | struct io_uring_rsrc_update2 up; | |
10698 | ||
10699 | if (size != sizeof(up)) | |
10700 | return -EINVAL; | |
98f0b3b4 PB |
10701 | if (copy_from_user(&up, arg, sizeof(up))) |
10702 | return -EFAULT; | |
992da01a | 10703 | if (!up.nr || up.resv) |
98f0b3b4 | 10704 | return -EINVAL; |
992da01a | 10705 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10706 | } |
10707 | ||
c072481d | 10708 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10709 | unsigned int size, unsigned int type) |
792e3582 PB |
10710 | { |
10711 | struct io_uring_rsrc_register rr; | |
10712 | ||
10713 | /* keep it extendible */ | |
10714 | if (size != sizeof(rr)) | |
10715 | return -EINVAL; | |
10716 | ||
10717 | memset(&rr, 0, sizeof(rr)); | |
10718 | if (copy_from_user(&rr, arg, size)) | |
10719 | return -EFAULT; | |
992da01a | 10720 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10721 | return -EINVAL; |
10722 | ||
992da01a | 10723 | switch (type) { |
792e3582 PB |
10724 | case IORING_RSRC_FILE: |
10725 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10726 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10727 | case IORING_RSRC_BUFFER: |
10728 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10729 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10730 | } |
10731 | return -EINVAL; | |
10732 | } | |
10733 | ||
c072481d PB |
10734 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
10735 | void __user *arg, unsigned len) | |
fe76421d JA |
10736 | { |
10737 | struct io_uring_task *tctx = current->io_uring; | |
10738 | cpumask_var_t new_mask; | |
10739 | int ret; | |
10740 | ||
10741 | if (!tctx || !tctx->io_wq) | |
10742 | return -EINVAL; | |
10743 | ||
10744 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10745 | return -ENOMEM; | |
10746 | ||
10747 | cpumask_clear(new_mask); | |
10748 | if (len > cpumask_size()) | |
10749 | len = cpumask_size(); | |
10750 | ||
10751 | if (copy_from_user(new_mask, arg, len)) { | |
10752 | free_cpumask_var(new_mask); | |
10753 | return -EFAULT; | |
10754 | } | |
10755 | ||
10756 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10757 | free_cpumask_var(new_mask); | |
10758 | return ret; | |
10759 | } | |
10760 | ||
c072481d | 10761 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
10762 | { |
10763 | struct io_uring_task *tctx = current->io_uring; | |
10764 | ||
10765 | if (!tctx || !tctx->io_wq) | |
10766 | return -EINVAL; | |
10767 | ||
10768 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10769 | } | |
10770 | ||
c072481d PB |
10771 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10772 | void __user *arg) | |
b22fa62a | 10773 | __must_hold(&ctx->uring_lock) |
2e480058 | 10774 | { |
b22fa62a | 10775 | struct io_tctx_node *node; |
fa84693b JA |
10776 | struct io_uring_task *tctx = NULL; |
10777 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
10778 | __u32 new_count[2]; |
10779 | int i, ret; | |
10780 | ||
2e480058 JA |
10781 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
10782 | return -EFAULT; | |
10783 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10784 | if (new_count[i] > INT_MAX) | |
10785 | return -EINVAL; | |
10786 | ||
fa84693b JA |
10787 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
10788 | sqd = ctx->sq_data; | |
10789 | if (sqd) { | |
009ad9f0 JA |
10790 | /* |
10791 | * Observe the correct sqd->lock -> ctx->uring_lock | |
10792 | * ordering. Fine to drop uring_lock here, we hold | |
10793 | * a ref to the ctx. | |
10794 | */ | |
41d3a6bd | 10795 | refcount_inc(&sqd->refs); |
009ad9f0 | 10796 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 10797 | mutex_lock(&sqd->lock); |
009ad9f0 | 10798 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
10799 | if (sqd->thread) |
10800 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
10801 | } |
10802 | } else { | |
10803 | tctx = current->io_uring; | |
10804 | } | |
10805 | ||
e139a1ec | 10806 | BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); |
fa84693b | 10807 | |
bad119b9 PB |
10808 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
10809 | if (new_count[i]) | |
10810 | ctx->iowq_limits[i] = new_count[i]; | |
e139a1ec PB |
10811 | ctx->iowq_limits_set = true; |
10812 | ||
e139a1ec PB |
10813 | if (tctx && tctx->io_wq) { |
10814 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
10815 | if (ret) | |
10816 | goto err; | |
10817 | } else { | |
10818 | memset(new_count, 0, sizeof(new_count)); | |
10819 | } | |
fa84693b | 10820 | |
41d3a6bd | 10821 | if (sqd) { |
fa84693b | 10822 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10823 | io_put_sq_data(sqd); |
10824 | } | |
2e480058 JA |
10825 | |
10826 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10827 | return -EFAULT; | |
10828 | ||
b22fa62a PB |
10829 | /* that's it for SQPOLL, only the SQPOLL task creates requests */ |
10830 | if (sqd) | |
10831 | return 0; | |
10832 | ||
10833 | /* now propagate the restriction to all registered users */ | |
10834 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
10835 | struct io_uring_task *tctx = node->task->io_uring; | |
10836 | ||
10837 | if (WARN_ON_ONCE(!tctx->io_wq)) | |
10838 | continue; | |
10839 | ||
10840 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10841 | new_count[i] = ctx->iowq_limits[i]; | |
10842 | /* ignore errors, it always returns zero anyway */ | |
10843 | (void)io_wq_max_workers(tctx->io_wq, new_count); | |
10844 | } | |
2e480058 | 10845 | return 0; |
fa84693b | 10846 | err: |
41d3a6bd | 10847 | if (sqd) { |
fa84693b | 10848 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10849 | io_put_sq_data(sqd); |
10850 | } | |
fa84693b | 10851 | return ret; |
2e480058 JA |
10852 | } |
10853 | ||
071698e1 JA |
10854 | static bool io_register_op_must_quiesce(int op) |
10855 | { | |
10856 | switch (op) { | |
bd54b6fe BM |
10857 | case IORING_REGISTER_BUFFERS: |
10858 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10859 | case IORING_REGISTER_FILES: |
071698e1 JA |
10860 | case IORING_UNREGISTER_FILES: |
10861 | case IORING_REGISTER_FILES_UPDATE: | |
10862 | case IORING_REGISTER_PROBE: | |
10863 | case IORING_REGISTER_PERSONALITY: | |
10864 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10865 | case IORING_REGISTER_FILES2: |
10866 | case IORING_REGISTER_FILES_UPDATE2: | |
10867 | case IORING_REGISTER_BUFFERS2: | |
10868 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10869 | case IORING_REGISTER_IOWQ_AFF: |
10870 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10871 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10872 | return false; |
10873 | default: | |
10874 | return true; | |
10875 | } | |
10876 | } | |
10877 | ||
c072481d | 10878 | static __cold int io_ctx_quiesce(struct io_ring_ctx *ctx) |
e73c5c7c PB |
10879 | { |
10880 | long ret; | |
10881 | ||
10882 | percpu_ref_kill(&ctx->refs); | |
10883 | ||
10884 | /* | |
10885 | * Drop uring mutex before waiting for references to exit. If another | |
10886 | * thread is currently inside io_uring_enter() it might need to grab the | |
10887 | * uring_lock to make progress. If we hold it here across the drain | |
10888 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10889 | * no new references will come in after we've killed the percpu ref. | |
10890 | */ | |
10891 | mutex_unlock(&ctx->uring_lock); | |
10892 | do { | |
37f0e767 PB |
10893 | ret = wait_for_completion_interruptible_timeout(&ctx->ref_comp, HZ); |
10894 | if (ret) { | |
10895 | ret = min(0L, ret); | |
e73c5c7c | 10896 | break; |
37f0e767 PB |
10897 | } |
10898 | ||
e73c5c7c | 10899 | ret = io_run_task_work_sig(); |
37f0e767 | 10900 | io_req_caches_free(ctx); |
e73c5c7c PB |
10901 | } while (ret >= 0); |
10902 | mutex_lock(&ctx->uring_lock); | |
10903 | ||
10904 | if (ret) | |
10905 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10906 | return ret; | |
10907 | } | |
10908 | ||
edafccee JA |
10909 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10910 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10911 | __releases(ctx->uring_lock) |
10912 | __acquires(ctx->uring_lock) | |
edafccee JA |
10913 | { |
10914 | int ret; | |
10915 | ||
35fa71a0 JA |
10916 | /* |
10917 | * We're inside the ring mutex, if the ref is already dying, then | |
10918 | * someone else killed the ctx or is already going through | |
10919 | * io_uring_register(). | |
10920 | */ | |
10921 | if (percpu_ref_is_dying(&ctx->refs)) | |
10922 | return -ENXIO; | |
10923 | ||
75c4021a PB |
10924 | if (ctx->restricted) { |
10925 | if (opcode >= IORING_REGISTER_LAST) | |
10926 | return -EINVAL; | |
10927 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10928 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10929 | return -EACCES; | |
10930 | } | |
10931 | ||
071698e1 | 10932 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10933 | ret = io_ctx_quiesce(ctx); |
10934 | if (ret) | |
f70865db | 10935 | return ret; |
05f3fb3c | 10936 | } |
edafccee JA |
10937 | |
10938 | switch (opcode) { | |
10939 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10940 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10941 | break; |
10942 | case IORING_UNREGISTER_BUFFERS: | |
10943 | ret = -EINVAL; | |
10944 | if (arg || nr_args) | |
10945 | break; | |
0a96bbe4 | 10946 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10947 | break; |
6b06314c | 10948 | case IORING_REGISTER_FILES: |
792e3582 | 10949 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10950 | break; |
10951 | case IORING_UNREGISTER_FILES: | |
10952 | ret = -EINVAL; | |
10953 | if (arg || nr_args) | |
10954 | break; | |
10955 | ret = io_sqe_files_unregister(ctx); | |
10956 | break; | |
c3a31e60 | 10957 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10958 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10959 | break; |
9b402849 | 10960 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10961 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10962 | ret = -EINVAL; |
10963 | if (nr_args != 1) | |
10964 | break; | |
10965 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10966 | if (ret) |
10967 | break; | |
10968 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10969 | ctx->eventfd_async = 1; | |
10970 | else | |
10971 | ctx->eventfd_async = 0; | |
9b402849 JA |
10972 | break; |
10973 | case IORING_UNREGISTER_EVENTFD: | |
10974 | ret = -EINVAL; | |
10975 | if (arg || nr_args) | |
10976 | break; | |
10977 | ret = io_eventfd_unregister(ctx); | |
10978 | break; | |
66f4af93 JA |
10979 | case IORING_REGISTER_PROBE: |
10980 | ret = -EINVAL; | |
10981 | if (!arg || nr_args > 256) | |
10982 | break; | |
10983 | ret = io_probe(ctx, arg, nr_args); | |
10984 | break; | |
071698e1 JA |
10985 | case IORING_REGISTER_PERSONALITY: |
10986 | ret = -EINVAL; | |
10987 | if (arg || nr_args) | |
10988 | break; | |
10989 | ret = io_register_personality(ctx); | |
10990 | break; | |
10991 | case IORING_UNREGISTER_PERSONALITY: | |
10992 | ret = -EINVAL; | |
10993 | if (arg) | |
10994 | break; | |
10995 | ret = io_unregister_personality(ctx, nr_args); | |
10996 | break; | |
7e84e1c7 SG |
10997 | case IORING_REGISTER_ENABLE_RINGS: |
10998 | ret = -EINVAL; | |
10999 | if (arg || nr_args) | |
11000 | break; | |
11001 | ret = io_register_enable_rings(ctx); | |
11002 | break; | |
21b55dbc SG |
11003 | case IORING_REGISTER_RESTRICTIONS: |
11004 | ret = io_register_restrictions(ctx, arg, nr_args); | |
11005 | break; | |
992da01a PB |
11006 | case IORING_REGISTER_FILES2: |
11007 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
11008 | break; | |
11009 | case IORING_REGISTER_FILES_UPDATE2: | |
11010 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11011 | IORING_RSRC_FILE); | |
11012 | break; | |
11013 | case IORING_REGISTER_BUFFERS2: | |
11014 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 11015 | break; |
992da01a PB |
11016 | case IORING_REGISTER_BUFFERS_UPDATE: |
11017 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11018 | IORING_RSRC_BUFFER); | |
c3bdad02 | 11019 | break; |
fe76421d JA |
11020 | case IORING_REGISTER_IOWQ_AFF: |
11021 | ret = -EINVAL; | |
11022 | if (!arg || !nr_args) | |
11023 | break; | |
11024 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
11025 | break; | |
11026 | case IORING_UNREGISTER_IOWQ_AFF: | |
11027 | ret = -EINVAL; | |
11028 | if (arg || nr_args) | |
11029 | break; | |
11030 | ret = io_unregister_iowq_aff(ctx); | |
11031 | break; | |
2e480058 JA |
11032 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
11033 | ret = -EINVAL; | |
11034 | if (!arg || nr_args != 2) | |
11035 | break; | |
11036 | ret = io_register_iowq_max_workers(ctx, arg); | |
11037 | break; | |
edafccee JA |
11038 | default: |
11039 | ret = -EINVAL; | |
11040 | break; | |
11041 | } | |
11042 | ||
071698e1 | 11043 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 11044 | /* bring the ctx back to life */ |
05f3fb3c | 11045 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 11046 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 11047 | } |
edafccee JA |
11048 | return ret; |
11049 | } | |
11050 | ||
11051 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
11052 | void __user *, arg, unsigned int, nr_args) | |
11053 | { | |
11054 | struct io_ring_ctx *ctx; | |
11055 | long ret = -EBADF; | |
11056 | struct fd f; | |
11057 | ||
11058 | f = fdget(fd); | |
11059 | if (!f.file) | |
11060 | return -EBADF; | |
11061 | ||
11062 | ret = -EOPNOTSUPP; | |
11063 | if (f.file->f_op != &io_uring_fops) | |
11064 | goto out_fput; | |
11065 | ||
11066 | ctx = f.file->private_data; | |
11067 | ||
b6c23dd5 PB |
11068 | io_run_task_work(); |
11069 | ||
edafccee JA |
11070 | mutex_lock(&ctx->uring_lock); |
11071 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
11072 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
11073 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
11074 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
11075 | out_fput: |
11076 | fdput(f); | |
11077 | return ret; | |
11078 | } | |
11079 | ||
2b188cc1 JA |
11080 | static int __init io_uring_init(void) |
11081 | { | |
d7f62e82 SM |
11082 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
11083 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
11084 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
11085 | } while (0) | |
11086 | ||
11087 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
11088 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
11089 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
11090 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
11091 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
11092 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
11093 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
11094 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
11095 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
11096 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 11097 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
11098 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
11099 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
11100 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
11101 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
11102 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
11103 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
11104 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
11105 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
11106 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
11107 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
11108 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
11109 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
11110 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
11111 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
11112 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 11113 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
11114 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
11115 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 11116 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 11117 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 11118 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 11119 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 11120 | |
b0d658ec PB |
11121 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
11122 | sizeof(struct io_uring_rsrc_update)); | |
11123 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
11124 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
11125 | |
11126 | /* ->buf_index is u16 */ | |
11127 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
11128 | ||
b0d658ec PB |
11129 | /* should fit into one byte */ |
11130 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
11131 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
11132 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 11133 | |
d3656344 | 11134 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 11135 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 11136 | |
91f245d5 JA |
11137 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
11138 | SLAB_ACCOUNT); | |
2b188cc1 JA |
11139 | return 0; |
11140 | }; | |
11141 | __initcall(io_uring_init); |