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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
d068b506 | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
1e84b97b SB |
15 | * store head will do). Failure to do so could lead to reading invalid |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
2b188cc1 | 60 | #include <linux/blkdev.h> |
edafccee | 61 | #include <linux/bvec.h> |
2b188cc1 JA |
62 | #include <linux/net.h> |
63 | #include <net/sock.h> | |
64 | #include <net/af_unix.h> | |
6b06314c | 65 | #include <net/scm.h> |
2b188cc1 JA |
66 | #include <linux/anon_inodes.h> |
67 | #include <linux/sched/mm.h> | |
68 | #include <linux/uaccess.h> | |
69 | #include <linux/nospec.h> | |
edafccee JA |
70 | #include <linux/sizes.h> |
71 | #include <linux/hugetlb.h> | |
aa4c3967 | 72 | #include <linux/highmem.h> |
15b71abe JA |
73 | #include <linux/namei.h> |
74 | #include <linux/fsnotify.h> | |
4840e418 | 75 | #include <linux/fadvise.h> |
3e4827b0 | 76 | #include <linux/eventpoll.h> |
7d67af2c | 77 | #include <linux/splice.h> |
b41e9852 | 78 | #include <linux/task_work.h> |
bcf5a063 | 79 | #include <linux/pagemap.h> |
0f212204 | 80 | #include <linux/io_uring.h> |
ef98eb04 | 81 | #include <linux/tracehook.h> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 93 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 94 | |
187f08c1 | 95 | /* only define max */ |
042b0d85 | 96 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
97 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
98 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 99 | |
187f08c1 | 100 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
101 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
102 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
103 | ||
489809e2 PB |
104 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
105 | ||
68fe256a PB |
106 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
107 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) | |
108 | ||
109 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS|IOSQE_BUFFER_SELECT|IOSQE_IO_DRAIN) | |
110 | ||
c854357b | 111 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
d886e185 PB |
112 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \ |
113 | REQ_F_ASYNC_DATA) | |
b16fed66 | 114 | |
09899b19 PB |
115 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
116 | ||
2b188cc1 JA |
117 | struct io_uring { |
118 | u32 head ____cacheline_aligned_in_smp; | |
119 | u32 tail ____cacheline_aligned_in_smp; | |
120 | }; | |
121 | ||
1e84b97b | 122 | /* |
75b28aff HV |
123 | * This data is shared with the application through the mmap at offsets |
124 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
125 | * |
126 | * The offsets to the member fields are published through struct | |
127 | * io_sqring_offsets when calling io_uring_setup. | |
128 | */ | |
75b28aff | 129 | struct io_rings { |
1e84b97b SB |
130 | /* |
131 | * Head and tail offsets into the ring; the offsets need to be | |
132 | * masked to get valid indices. | |
133 | * | |
75b28aff HV |
134 | * The kernel controls head of the sq ring and the tail of the cq ring, |
135 | * and the application controls tail of the sq ring and the head of the | |
136 | * cq ring. | |
1e84b97b | 137 | */ |
75b28aff | 138 | struct io_uring sq, cq; |
1e84b97b | 139 | /* |
75b28aff | 140 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
141 | * ring_entries - 1) |
142 | */ | |
75b28aff HV |
143 | u32 sq_ring_mask, cq_ring_mask; |
144 | /* Ring sizes (constant, power of 2) */ | |
145 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
146 | /* |
147 | * Number of invalid entries dropped by the kernel due to | |
148 | * invalid index stored in array | |
149 | * | |
150 | * Written by the kernel, shouldn't be modified by the | |
151 | * application (i.e. get number of "new events" by comparing to | |
152 | * cached value). | |
153 | * | |
154 | * After a new SQ head value was read by the application this | |
155 | * counter includes all submissions that were dropped reaching | |
156 | * the new SQ head (and possibly more). | |
157 | */ | |
75b28aff | 158 | u32 sq_dropped; |
1e84b97b | 159 | /* |
0d9b5b3a | 160 | * Runtime SQ flags |
1e84b97b SB |
161 | * |
162 | * Written by the kernel, shouldn't be modified by the | |
163 | * application. | |
164 | * | |
165 | * The application needs a full memory barrier before checking | |
166 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
167 | */ | |
75b28aff | 168 | u32 sq_flags; |
0d9b5b3a SG |
169 | /* |
170 | * Runtime CQ flags | |
171 | * | |
172 | * Written by the application, shouldn't be modified by the | |
173 | * kernel. | |
174 | */ | |
fe7e3257 | 175 | u32 cq_flags; |
1e84b97b SB |
176 | /* |
177 | * Number of completion events lost because the queue was full; | |
178 | * this should be avoided by the application by making sure | |
0b4295b5 | 179 | * there are not more requests pending than there is space in |
1e84b97b SB |
180 | * the completion queue. |
181 | * | |
182 | * Written by the kernel, shouldn't be modified by the | |
183 | * application (i.e. get number of "new events" by comparing to | |
184 | * cached value). | |
185 | * | |
186 | * As completion events come in out of order this counter is not | |
187 | * ordered with any other data. | |
188 | */ | |
75b28aff | 189 | u32 cq_overflow; |
1e84b97b SB |
190 | /* |
191 | * Ring buffer of completion events. | |
192 | * | |
193 | * The kernel writes completion events fresh every time they are | |
194 | * produced, so the application is allowed to modify pending | |
195 | * entries. | |
196 | */ | |
75b28aff | 197 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
198 | }; |
199 | ||
45d189c6 | 200 | enum io_uring_cmd_flags { |
51aac424 PB |
201 | IO_URING_F_COMPLETE_DEFER = 1, |
202 | /* int's last bit, sign checks are usually faster than a bit test */ | |
203 | IO_URING_F_NONBLOCK = INT_MIN, | |
45d189c6 PB |
204 | }; |
205 | ||
edafccee JA |
206 | struct io_mapped_ubuf { |
207 | u64 ubuf; | |
4751f53d | 208 | u64 ubuf_end; |
edafccee | 209 | unsigned int nr_bvecs; |
de293938 | 210 | unsigned long acct_pages; |
41edf1a5 | 211 | struct bio_vec bvec[]; |
edafccee JA |
212 | }; |
213 | ||
50238531 BM |
214 | struct io_ring_ctx; |
215 | ||
6c2450ae PB |
216 | struct io_overflow_cqe { |
217 | struct io_uring_cqe cqe; | |
218 | struct list_head list; | |
219 | }; | |
220 | ||
a04b0ac0 PB |
221 | struct io_fixed_file { |
222 | /* file * with additional FFS_* flags */ | |
223 | unsigned long file_ptr; | |
224 | }; | |
225 | ||
269bbe5f BM |
226 | struct io_rsrc_put { |
227 | struct list_head list; | |
b60c8dce | 228 | u64 tag; |
50238531 BM |
229 | union { |
230 | void *rsrc; | |
231 | struct file *file; | |
bd54b6fe | 232 | struct io_mapped_ubuf *buf; |
50238531 | 233 | }; |
269bbe5f BM |
234 | }; |
235 | ||
aeca241b | 236 | struct io_file_table { |
042b0d85 | 237 | struct io_fixed_file *files; |
31b51510 JA |
238 | }; |
239 | ||
b895c9a6 | 240 | struct io_rsrc_node { |
05589553 XW |
241 | struct percpu_ref refs; |
242 | struct list_head node; | |
269bbe5f | 243 | struct list_head rsrc_list; |
b895c9a6 | 244 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 245 | struct llist_node llist; |
e297822b | 246 | bool done; |
05589553 XW |
247 | }; |
248 | ||
40ae0ff7 PB |
249 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
250 | ||
b895c9a6 | 251 | struct io_rsrc_data { |
05f3fb3c JA |
252 | struct io_ring_ctx *ctx; |
253 | ||
2d091d62 PB |
254 | u64 **tags; |
255 | unsigned int nr; | |
40ae0ff7 | 256 | rsrc_put_fn *do_put; |
3e942498 | 257 | atomic_t refs; |
05f3fb3c | 258 | struct completion done; |
8bad28d8 | 259 | bool quiesce; |
05f3fb3c JA |
260 | }; |
261 | ||
5a2e745d JA |
262 | struct io_buffer { |
263 | struct list_head list; | |
264 | __u64 addr; | |
d1f82808 | 265 | __u32 len; |
5a2e745d JA |
266 | __u16 bid; |
267 | }; | |
268 | ||
21b55dbc SG |
269 | struct io_restriction { |
270 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
271 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
272 | u8 sqe_flags_allowed; | |
273 | u8 sqe_flags_required; | |
7e84e1c7 | 274 | bool registered; |
21b55dbc SG |
275 | }; |
276 | ||
37d1e2e3 JA |
277 | enum { |
278 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
279 | IO_SQ_THREAD_SHOULD_PARK, | |
280 | }; | |
281 | ||
534ca6d6 JA |
282 | struct io_sq_data { |
283 | refcount_t refs; | |
9e138a48 | 284 | atomic_t park_pending; |
09a6f4ef | 285 | struct mutex lock; |
69fb2131 JA |
286 | |
287 | /* ctx's that are using this sqd */ | |
288 | struct list_head ctx_list; | |
69fb2131 | 289 | |
534ca6d6 JA |
290 | struct task_struct *thread; |
291 | struct wait_queue_head wait; | |
08369246 XW |
292 | |
293 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
294 | int sq_cpu; |
295 | pid_t task_pid; | |
5c2469e0 | 296 | pid_t task_tgid; |
37d1e2e3 JA |
297 | |
298 | unsigned long state; | |
37d1e2e3 | 299 | struct completion exited; |
534ca6d6 JA |
300 | }; |
301 | ||
6dd0be1e | 302 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 303 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 304 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 305 | |
a1ab7b35 PB |
306 | struct io_submit_link { |
307 | struct io_kiocb *head; | |
308 | struct io_kiocb *last; | |
309 | }; | |
310 | ||
258b29a9 | 311 | struct io_submit_state { |
5a158c6b PB |
312 | /* inline/task_work completion list, under ->uring_lock */ |
313 | struct io_wq_work_node free_list; | |
314 | /* batch completion logic */ | |
315 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 316 | struct io_submit_link link; |
258b29a9 | 317 | |
258b29a9 | 318 | bool plug_started; |
4b628aeb | 319 | bool need_plug; |
5a158c6b | 320 | struct blk_plug plug; |
258b29a9 PB |
321 | }; |
322 | ||
2b188cc1 | 323 | struct io_ring_ctx { |
b52ecf8c | 324 | /* const or read-mostly hot data */ |
2b188cc1 JA |
325 | struct { |
326 | struct percpu_ref refs; | |
2b188cc1 | 327 | |
b52ecf8c | 328 | struct io_rings *rings; |
2b188cc1 | 329 | unsigned int flags; |
e1d85334 | 330 | unsigned int compat: 1; |
e1d85334 RD |
331 | unsigned int drain_next: 1; |
332 | unsigned int eventfd_async: 1; | |
21b55dbc | 333 | unsigned int restricted: 1; |
f18ee4cf | 334 | unsigned int off_timeout_used: 1; |
10c66904 | 335 | unsigned int drain_active: 1; |
b52ecf8c | 336 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 337 | |
7f1129d2 | 338 | /* submission data */ |
b52ecf8c | 339 | struct { |
0499e582 PB |
340 | struct mutex uring_lock; |
341 | ||
75b28aff HV |
342 | /* |
343 | * Ring buffer of indices into array of io_uring_sqe, which is | |
344 | * mmapped by the application using the IORING_OFF_SQES offset. | |
345 | * | |
346 | * This indirection could e.g. be used to assign fixed | |
347 | * io_uring_sqe entries to operations and only submit them to | |
348 | * the queue when needed. | |
349 | * | |
350 | * The kernel modifies neither the indices array nor the entries | |
351 | * array. | |
352 | */ | |
353 | u32 *sq_array; | |
c7af47cf | 354 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
355 | unsigned cached_sq_head; |
356 | unsigned sq_entries; | |
de0617e4 | 357 | struct list_head defer_list; |
7f1129d2 PB |
358 | |
359 | /* | |
360 | * Fixed resources fast path, should be accessed only under | |
361 | * uring_lock, and updated through io_uring_register(2) | |
362 | */ | |
363 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 364 | int rsrc_cached_refs; |
7f1129d2 PB |
365 | struct io_file_table file_table; |
366 | unsigned nr_user_files; | |
367 | unsigned nr_user_bufs; | |
368 | struct io_mapped_ubuf **user_bufs; | |
369 | ||
370 | struct io_submit_state submit_state; | |
5262f567 | 371 | struct list_head timeout_list; |
ef9dd637 | 372 | struct list_head ltimeout_list; |
1d7bb1d5 | 373 | struct list_head cq_overflow_list; |
7f1129d2 PB |
374 | struct xarray io_buffers; |
375 | struct xarray personalities; | |
376 | u32 pers_next; | |
377 | unsigned sq_thread_idle; | |
2b188cc1 JA |
378 | } ____cacheline_aligned_in_smp; |
379 | ||
d0acdee2 | 380 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 381 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 382 | unsigned int locked_free_nr; |
3c1a2ead | 383 | |
7c30f36a | 384 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
385 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
386 | ||
90554200 | 387 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 388 | struct list_head sqd_list; |
75b28aff | 389 | |
5ed7a37d PB |
390 | unsigned long check_cq_overflow; |
391 | ||
206aefde JA |
392 | struct { |
393 | unsigned cached_cq_tail; | |
394 | unsigned cq_entries; | |
0499e582 | 395 | struct eventfd_ctx *cq_ev_fd; |
0499e582 PB |
396 | struct wait_queue_head cq_wait; |
397 | unsigned cq_extra; | |
398 | atomic_t cq_timeouts; | |
0499e582 | 399 | unsigned cq_last_tm_flush; |
206aefde | 400 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 401 | |
2b188cc1 JA |
402 | struct { |
403 | spinlock_t completion_lock; | |
e94f141b | 404 | |
89850fce JA |
405 | spinlock_t timeout_lock; |
406 | ||
def596e9 | 407 | /* |
540e32a0 | 408 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
409 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
410 | * For SQPOLL, only the single threaded io_sq_thread() will | |
411 | * manipulate the list, hence no extra locking is needed there. | |
412 | */ | |
5eef4e87 | 413 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
414 | struct hlist_head *cancel_hash; |
415 | unsigned cancel_hash_bits; | |
915b3dde | 416 | bool poll_multi_queue; |
2b188cc1 | 417 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 418 | |
21b55dbc | 419 | struct io_restriction restrictions; |
3c1a2ead | 420 | |
b13a8918 PB |
421 | /* slow path rsrc auxilary data, used by update/register */ |
422 | struct { | |
423 | struct io_rsrc_node *rsrc_backup_node; | |
424 | struct io_mapped_ubuf *dummy_ubuf; | |
425 | struct io_rsrc_data *file_data; | |
426 | struct io_rsrc_data *buf_data; | |
427 | ||
428 | struct delayed_work rsrc_put_work; | |
429 | struct llist_head rsrc_put_llist; | |
430 | struct list_head rsrc_ref_list; | |
431 | spinlock_t rsrc_ref_lock; | |
432 | }; | |
433 | ||
3c1a2ead | 434 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
435 | struct { |
436 | #if defined(CONFIG_UNIX) | |
437 | struct socket *ring_sock; | |
438 | #endif | |
439 | /* hashed buffered write serialization */ | |
440 | struct io_wq_hash *hash_map; | |
441 | ||
442 | /* Only used for accounting purposes */ | |
443 | struct user_struct *user; | |
444 | struct mm_struct *mm_account; | |
445 | ||
446 | /* ctx exit and cancelation */ | |
9011bf9a PB |
447 | struct llist_head fallback_llist; |
448 | struct delayed_work fallback_work; | |
b986af7e PB |
449 | struct work_struct exit_work; |
450 | struct list_head tctx_list; | |
451 | struct completion ref_comp; | |
452 | }; | |
2b188cc1 JA |
453 | }; |
454 | ||
53e043b2 SM |
455 | struct io_uring_task { |
456 | /* submission side */ | |
09899b19 | 457 | int cached_refs; |
53e043b2 SM |
458 | struct xarray xa; |
459 | struct wait_queue_head wait; | |
ee53fb2b SM |
460 | const struct io_ring_ctx *last; |
461 | struct io_wq *io_wq; | |
53e043b2 | 462 | struct percpu_counter inflight; |
b303fe2e | 463 | atomic_t inflight_tracked; |
53e043b2 | 464 | atomic_t in_idle; |
53e043b2 SM |
465 | |
466 | spinlock_t task_lock; | |
467 | struct io_wq_work_list task_list; | |
53e043b2 | 468 | struct callback_head task_work; |
6294f368 | 469 | bool task_running; |
53e043b2 SM |
470 | }; |
471 | ||
09bb8394 JA |
472 | /* |
473 | * First field must be the file pointer in all the | |
474 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
475 | */ | |
221c5eb2 JA |
476 | struct io_poll_iocb { |
477 | struct file *file; | |
018043be | 478 | struct wait_queue_head *head; |
221c5eb2 | 479 | __poll_t events; |
8c838788 | 480 | bool done; |
221c5eb2 | 481 | bool canceled; |
392edb45 | 482 | struct wait_queue_entry wait; |
221c5eb2 JA |
483 | }; |
484 | ||
9d805892 | 485 | struct io_poll_update { |
018043be | 486 | struct file *file; |
9d805892 PB |
487 | u64 old_user_data; |
488 | u64 new_user_data; | |
489 | __poll_t events; | |
b69de288 JA |
490 | bool update_events; |
491 | bool update_user_data; | |
018043be PB |
492 | }; |
493 | ||
b5dba59e JA |
494 | struct io_close { |
495 | struct file *file; | |
b5dba59e | 496 | int fd; |
7df778be | 497 | u32 file_slot; |
b5dba59e JA |
498 | }; |
499 | ||
ad8a48ac JA |
500 | struct io_timeout_data { |
501 | struct io_kiocb *req; | |
502 | struct hrtimer timer; | |
503 | struct timespec64 ts; | |
504 | enum hrtimer_mode mode; | |
50c1df2b | 505 | u32 flags; |
ad8a48ac JA |
506 | }; |
507 | ||
8ed8d3c3 JA |
508 | struct io_accept { |
509 | struct file *file; | |
510 | struct sockaddr __user *addr; | |
511 | int __user *addr_len; | |
512 | int flags; | |
aaa4db12 | 513 | u32 file_slot; |
09952e3e | 514 | unsigned long nofile; |
8ed8d3c3 JA |
515 | }; |
516 | ||
517 | struct io_sync { | |
518 | struct file *file; | |
519 | loff_t len; | |
520 | loff_t off; | |
521 | int flags; | |
d63d1b5e | 522 | int mode; |
8ed8d3c3 JA |
523 | }; |
524 | ||
fbf23849 JA |
525 | struct io_cancel { |
526 | struct file *file; | |
527 | u64 addr; | |
528 | }; | |
529 | ||
b29472ee JA |
530 | struct io_timeout { |
531 | struct file *file; | |
bfe68a22 PB |
532 | u32 off; |
533 | u32 target_seq; | |
135fcde8 | 534 | struct list_head list; |
90cd7e42 PB |
535 | /* head of the link, used by linked timeouts only */ |
536 | struct io_kiocb *head; | |
89b263f6 JA |
537 | /* for linked completions */ |
538 | struct io_kiocb *prev; | |
b29472ee JA |
539 | }; |
540 | ||
0bdf7a2d PB |
541 | struct io_timeout_rem { |
542 | struct file *file; | |
543 | u64 addr; | |
9c8e11b3 PB |
544 | |
545 | /* timeout update */ | |
546 | struct timespec64 ts; | |
547 | u32 flags; | |
f1042b6c | 548 | bool ltimeout; |
0bdf7a2d PB |
549 | }; |
550 | ||
9adbd45d JA |
551 | struct io_rw { |
552 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
553 | struct kiocb kiocb; | |
554 | u64 addr; | |
555 | u64 len; | |
556 | }; | |
557 | ||
3fbb51c1 JA |
558 | struct io_connect { |
559 | struct file *file; | |
560 | struct sockaddr __user *addr; | |
561 | int addr_len; | |
562 | }; | |
563 | ||
e47293fd JA |
564 | struct io_sr_msg { |
565 | struct file *file; | |
fddaface | 566 | union { |
4af3417a PB |
567 | struct compat_msghdr __user *umsg_compat; |
568 | struct user_msghdr __user *umsg; | |
569 | void __user *buf; | |
fddaface | 570 | }; |
e47293fd | 571 | int msg_flags; |
bcda7baa | 572 | int bgid; |
fddaface | 573 | size_t len; |
e47293fd JA |
574 | }; |
575 | ||
15b71abe JA |
576 | struct io_open { |
577 | struct file *file; | |
578 | int dfd; | |
b9445598 | 579 | u32 file_slot; |
15b71abe | 580 | struct filename *filename; |
c12cedf2 | 581 | struct open_how how; |
4022e7af | 582 | unsigned long nofile; |
15b71abe JA |
583 | }; |
584 | ||
269bbe5f | 585 | struct io_rsrc_update { |
05f3fb3c JA |
586 | struct file *file; |
587 | u64 arg; | |
588 | u32 nr_args; | |
589 | u32 offset; | |
590 | }; | |
591 | ||
4840e418 JA |
592 | struct io_fadvise { |
593 | struct file *file; | |
594 | u64 offset; | |
595 | u32 len; | |
596 | u32 advice; | |
597 | }; | |
598 | ||
c1ca757b JA |
599 | struct io_madvise { |
600 | struct file *file; | |
601 | u64 addr; | |
602 | u32 len; | |
603 | u32 advice; | |
604 | }; | |
605 | ||
3e4827b0 JA |
606 | struct io_epoll { |
607 | struct file *file; | |
608 | int epfd; | |
609 | int op; | |
610 | int fd; | |
611 | struct epoll_event event; | |
e47293fd JA |
612 | }; |
613 | ||
7d67af2c PB |
614 | struct io_splice { |
615 | struct file *file_out; | |
616 | struct file *file_in; | |
617 | loff_t off_out; | |
618 | loff_t off_in; | |
619 | u64 len; | |
620 | unsigned int flags; | |
621 | }; | |
622 | ||
ddf0322d JA |
623 | struct io_provide_buf { |
624 | struct file *file; | |
625 | __u64 addr; | |
38134ada | 626 | __u32 len; |
ddf0322d JA |
627 | __u32 bgid; |
628 | __u16 nbufs; | |
629 | __u16 bid; | |
630 | }; | |
631 | ||
1d9e1288 BM |
632 | struct io_statx { |
633 | struct file *file; | |
634 | int dfd; | |
635 | unsigned int mask; | |
636 | unsigned int flags; | |
e62753e4 | 637 | const char __user *filename; |
1d9e1288 BM |
638 | struct statx __user *buffer; |
639 | }; | |
640 | ||
36f4fa68 JA |
641 | struct io_shutdown { |
642 | struct file *file; | |
643 | int how; | |
644 | }; | |
645 | ||
80a261fd JA |
646 | struct io_rename { |
647 | struct file *file; | |
648 | int old_dfd; | |
649 | int new_dfd; | |
650 | struct filename *oldpath; | |
651 | struct filename *newpath; | |
652 | int flags; | |
653 | }; | |
654 | ||
14a1143b JA |
655 | struct io_unlink { |
656 | struct file *file; | |
657 | int dfd; | |
658 | int flags; | |
659 | struct filename *filename; | |
660 | }; | |
661 | ||
e34a02dc DK |
662 | struct io_mkdir { |
663 | struct file *file; | |
664 | int dfd; | |
665 | umode_t mode; | |
666 | struct filename *filename; | |
667 | }; | |
668 | ||
7a8721f8 DK |
669 | struct io_symlink { |
670 | struct file *file; | |
671 | int new_dfd; | |
672 | struct filename *oldpath; | |
673 | struct filename *newpath; | |
674 | }; | |
675 | ||
cf30da90 DK |
676 | struct io_hardlink { |
677 | struct file *file; | |
678 | int old_dfd; | |
679 | int new_dfd; | |
680 | struct filename *oldpath; | |
681 | struct filename *newpath; | |
682 | int flags; | |
683 | }; | |
684 | ||
f499a021 JA |
685 | struct io_async_connect { |
686 | struct sockaddr_storage address; | |
687 | }; | |
688 | ||
03b1230c JA |
689 | struct io_async_msghdr { |
690 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
691 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
692 | struct iovec *free_iov; | |
03b1230c JA |
693 | struct sockaddr __user *uaddr; |
694 | struct msghdr msg; | |
b537916c | 695 | struct sockaddr_storage addr; |
03b1230c JA |
696 | }; |
697 | ||
538941e2 | 698 | struct io_rw_state { |
ff6165b2 | 699 | struct iov_iter iter; |
cd658695 | 700 | struct iov_iter_state iter_state; |
c88598a9 | 701 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
702 | }; |
703 | ||
704 | struct io_async_rw { | |
705 | struct io_rw_state s; | |
706 | const struct iovec *free_iovec; | |
227c0c96 | 707 | size_t bytes_done; |
bcf5a063 | 708 | struct wait_page_queue wpq; |
f67676d1 JA |
709 | }; |
710 | ||
6b47ee6e PB |
711 | enum { |
712 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
713 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
714 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
715 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
716 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 717 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 718 | |
dddca226 | 719 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 720 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
721 | REQ_F_INFLIGHT_BIT, |
722 | REQ_F_CUR_POS_BIT, | |
723 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 724 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 725 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 726 | REQ_F_POLLED_BIT, |
bcda7baa | 727 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 728 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 729 | REQ_F_REISSUE_BIT, |
b8e64b53 | 730 | REQ_F_CREDS_BIT, |
20e60a38 | 731 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 732 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 733 | REQ_F_ASYNC_DATA_BIT, |
7b29f92d | 734 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 735 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 736 | REQ_F_ISREG_BIT, |
84557871 JA |
737 | |
738 | /* not a real bit, just to check we're not overflowing the space */ | |
739 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
740 | }; |
741 | ||
742 | enum { | |
743 | /* ctx owns file */ | |
744 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
745 | /* drain existing IO first */ | |
746 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
747 | /* linked sqes */ | |
748 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
749 | /* doesn't sever on completion < 0 */ | |
750 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
751 | /* IOSQE_ASYNC */ | |
752 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
753 | /* IOSQE_BUFFER_SELECT */ |
754 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 755 | |
6b47ee6e | 756 | /* fail rest of links */ |
93d2bcd2 | 757 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 758 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
759 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
760 | /* read/write uses file position */ | |
761 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
762 | /* must not punt to workers */ | |
763 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 764 | /* has or had linked timeout */ |
6b47ee6e | 765 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
766 | /* needs cleanup */ |
767 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
768 | /* already went through poll handler */ |
769 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
770 | /* buffer already selected */ |
771 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
772 | /* completion is deferred through io_comp_state */ |
773 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
774 | /* caller should reissue async */ |
775 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
776 | /* supports async reads/writes */ |
777 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
778 | /* regular file */ |
779 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
780 | /* has creds assigned */ |
781 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
782 | /* skip refcounting if not set */ |
783 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
784 | /* there is a linked timeout that has to be armed */ |
785 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
786 | /* ->async_data allocated */ |
787 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
d7718a9d JA |
788 | }; |
789 | ||
790 | struct async_poll { | |
791 | struct io_poll_iocb poll; | |
807abcb0 | 792 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
793 | }; |
794 | ||
f237c30a | 795 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 796 | |
7cbf1722 | 797 | struct io_task_work { |
5b0a6acc PB |
798 | union { |
799 | struct io_wq_work_node node; | |
800 | struct llist_node fallback_node; | |
801 | }; | |
802 | io_req_tw_func_t func; | |
7cbf1722 JA |
803 | }; |
804 | ||
992da01a PB |
805 | enum { |
806 | IORING_RSRC_FILE = 0, | |
807 | IORING_RSRC_BUFFER = 1, | |
808 | }; | |
809 | ||
09bb8394 JA |
810 | /* |
811 | * NOTE! Each of the iocb union members has the file pointer | |
812 | * as the first entry in their struct definition. So you can | |
813 | * access the file pointer through any of the sub-structs, | |
814 | * or directly as just 'ki_filp' in this struct. | |
815 | */ | |
2b188cc1 | 816 | struct io_kiocb { |
221c5eb2 | 817 | union { |
09bb8394 | 818 | struct file *file; |
9adbd45d | 819 | struct io_rw rw; |
221c5eb2 | 820 | struct io_poll_iocb poll; |
9d805892 | 821 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
822 | struct io_accept accept; |
823 | struct io_sync sync; | |
fbf23849 | 824 | struct io_cancel cancel; |
b29472ee | 825 | struct io_timeout timeout; |
0bdf7a2d | 826 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 827 | struct io_connect connect; |
e47293fd | 828 | struct io_sr_msg sr_msg; |
15b71abe | 829 | struct io_open open; |
b5dba59e | 830 | struct io_close close; |
269bbe5f | 831 | struct io_rsrc_update rsrc_update; |
4840e418 | 832 | struct io_fadvise fadvise; |
c1ca757b | 833 | struct io_madvise madvise; |
3e4827b0 | 834 | struct io_epoll epoll; |
7d67af2c | 835 | struct io_splice splice; |
ddf0322d | 836 | struct io_provide_buf pbuf; |
1d9e1288 | 837 | struct io_statx statx; |
36f4fa68 | 838 | struct io_shutdown shutdown; |
80a261fd | 839 | struct io_rename rename; |
14a1143b | 840 | struct io_unlink unlink; |
e34a02dc | 841 | struct io_mkdir mkdir; |
7a8721f8 | 842 | struct io_symlink symlink; |
cf30da90 | 843 | struct io_hardlink hardlink; |
221c5eb2 | 844 | }; |
2b188cc1 | 845 | |
d625c6ee | 846 | u8 opcode; |
65a6543d XW |
847 | /* polled IO has completed */ |
848 | u8 iopoll_completed; | |
4f4eeba8 | 849 | u16 buf_index; |
d17e56eb PB |
850 | unsigned int flags; |
851 | ||
852 | u64 user_data; | |
9cf7c104 | 853 | u32 result; |
d17e56eb | 854 | u32 cflags; |
4f4eeba8 | 855 | |
010e8e6b | 856 | struct io_ring_ctx *ctx; |
010e8e6b | 857 | struct task_struct *task; |
d7718a9d | 858 | |
269bbe5f | 859 | struct percpu_ref *fixed_rsrc_refs; |
d886e185 PB |
860 | /* store used ubuf, so we can prevent reloading */ |
861 | struct io_mapped_ubuf *imu; | |
fcb323cc | 862 | |
7e3709d5 | 863 | /* used by request caches, completion batching and iopoll */ |
ef05d9eb | 864 | struct io_wq_work_node comp_list; |
d17e56eb | 865 | atomic_t refs; |
7e3709d5 | 866 | struct io_kiocb *link; |
5b0a6acc | 867 | struct io_task_work io_task_work; |
010e8e6b PB |
868 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
869 | struct hlist_node hash_node; | |
7e3709d5 | 870 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 871 | struct async_poll *apoll; |
d886e185 PB |
872 | /* opcode allocated if it needs to store data for async defer */ |
873 | void *async_data; | |
ef05d9eb | 874 | struct io_wq_work work; |
7e3709d5 | 875 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
ef05d9eb | 876 | const struct cred *creds; |
7e3709d5 | 877 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ |
30d51dd4 | 878 | struct io_buffer *kbuf; |
2b188cc1 | 879 | }; |
05589553 | 880 | |
13bf43f5 PB |
881 | struct io_tctx_node { |
882 | struct list_head ctx_node; | |
883 | struct task_struct *task; | |
13bf43f5 PB |
884 | struct io_ring_ctx *ctx; |
885 | }; | |
886 | ||
27dc8338 PB |
887 | struct io_defer_entry { |
888 | struct list_head list; | |
889 | struct io_kiocb *req; | |
9cf7c104 | 890 | u32 seq; |
2b188cc1 JA |
891 | }; |
892 | ||
d3656344 | 893 | struct io_op_def { |
d3656344 JA |
894 | /* needs req->file assigned */ |
895 | unsigned needs_file : 1; | |
6d63416d PB |
896 | /* should block plug */ |
897 | unsigned plug : 1; | |
d3656344 JA |
898 | /* hash wq insertion if file is a regular file */ |
899 | unsigned hash_reg_file : 1; | |
900 | /* unbound wq insertion if file is a non-regular file */ | |
901 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
902 | /* set if opcode supports polled "wait" */ |
903 | unsigned pollin : 1; | |
904 | unsigned pollout : 1; | |
bcda7baa JA |
905 | /* op supports buffer selection */ |
906 | unsigned buffer_select : 1; | |
26f0505a PB |
907 | /* do prep async if is going to be punted */ |
908 | unsigned needs_async_setup : 1; | |
6d63416d PB |
909 | /* opcode is not supported by this kernel */ |
910 | unsigned not_supported : 1; | |
e8c2bc1f JA |
911 | /* size of async data needed, if any */ |
912 | unsigned short async_size; | |
d3656344 JA |
913 | }; |
914 | ||
0918682b | 915 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
916 | [IORING_OP_NOP] = {}, |
917 | [IORING_OP_READV] = { | |
d3656344 JA |
918 | .needs_file = 1, |
919 | .unbound_nonreg_file = 1, | |
8a72758c | 920 | .pollin = 1, |
4d954c25 | 921 | .buffer_select = 1, |
26f0505a | 922 | .needs_async_setup = 1, |
27926b68 | 923 | .plug = 1, |
e8c2bc1f | 924 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 925 | }, |
0463b6c5 | 926 | [IORING_OP_WRITEV] = { |
d3656344 JA |
927 | .needs_file = 1, |
928 | .hash_reg_file = 1, | |
929 | .unbound_nonreg_file = 1, | |
8a72758c | 930 | .pollout = 1, |
26f0505a | 931 | .needs_async_setup = 1, |
27926b68 | 932 | .plug = 1, |
e8c2bc1f | 933 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 934 | }, |
0463b6c5 | 935 | [IORING_OP_FSYNC] = { |
d3656344 JA |
936 | .needs_file = 1, |
937 | }, | |
0463b6c5 | 938 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
939 | .needs_file = 1, |
940 | .unbound_nonreg_file = 1, | |
8a72758c | 941 | .pollin = 1, |
27926b68 | 942 | .plug = 1, |
e8c2bc1f | 943 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 944 | }, |
0463b6c5 | 945 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
946 | .needs_file = 1, |
947 | .hash_reg_file = 1, | |
948 | .unbound_nonreg_file = 1, | |
8a72758c | 949 | .pollout = 1, |
27926b68 | 950 | .plug = 1, |
e8c2bc1f | 951 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 952 | }, |
0463b6c5 | 953 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
954 | .needs_file = 1, |
955 | .unbound_nonreg_file = 1, | |
956 | }, | |
0463b6c5 PB |
957 | [IORING_OP_POLL_REMOVE] = {}, |
958 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
959 | .needs_file = 1, |
960 | }, | |
0463b6c5 | 961 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
962 | .needs_file = 1, |
963 | .unbound_nonreg_file = 1, | |
8a72758c | 964 | .pollout = 1, |
26f0505a | 965 | .needs_async_setup = 1, |
e8c2bc1f | 966 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 967 | }, |
0463b6c5 | 968 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
969 | .needs_file = 1, |
970 | .unbound_nonreg_file = 1, | |
8a72758c | 971 | .pollin = 1, |
52de1fe1 | 972 | .buffer_select = 1, |
26f0505a | 973 | .needs_async_setup = 1, |
e8c2bc1f | 974 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 975 | }, |
0463b6c5 | 976 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 977 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 978 | }, |
9c8e11b3 PB |
979 | [IORING_OP_TIMEOUT_REMOVE] = { |
980 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 981 | }, |
0463b6c5 | 982 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
983 | .needs_file = 1, |
984 | .unbound_nonreg_file = 1, | |
8a72758c | 985 | .pollin = 1, |
d3656344 | 986 | }, |
0463b6c5 PB |
987 | [IORING_OP_ASYNC_CANCEL] = {}, |
988 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 989 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 990 | }, |
0463b6c5 | 991 | [IORING_OP_CONNECT] = { |
d3656344 JA |
992 | .needs_file = 1, |
993 | .unbound_nonreg_file = 1, | |
8a72758c | 994 | .pollout = 1, |
26f0505a | 995 | .needs_async_setup = 1, |
e8c2bc1f | 996 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 997 | }, |
0463b6c5 | 998 | [IORING_OP_FALLOCATE] = { |
d3656344 | 999 | .needs_file = 1, |
d3656344 | 1000 | }, |
44526bed JA |
1001 | [IORING_OP_OPENAT] = {}, |
1002 | [IORING_OP_CLOSE] = {}, | |
1003 | [IORING_OP_FILES_UPDATE] = {}, | |
1004 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 1005 | [IORING_OP_READ] = { |
3a6820f2 JA |
1006 | .needs_file = 1, |
1007 | .unbound_nonreg_file = 1, | |
8a72758c | 1008 | .pollin = 1, |
bcda7baa | 1009 | .buffer_select = 1, |
27926b68 | 1010 | .plug = 1, |
e8c2bc1f | 1011 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1012 | }, |
0463b6c5 | 1013 | [IORING_OP_WRITE] = { |
3a6820f2 | 1014 | .needs_file = 1, |
7b3188e7 | 1015 | .hash_reg_file = 1, |
3a6820f2 | 1016 | .unbound_nonreg_file = 1, |
8a72758c | 1017 | .pollout = 1, |
27926b68 | 1018 | .plug = 1, |
e8c2bc1f | 1019 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1020 | }, |
0463b6c5 | 1021 | [IORING_OP_FADVISE] = { |
4840e418 | 1022 | .needs_file = 1, |
c1ca757b | 1023 | }, |
44526bed | 1024 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1025 | [IORING_OP_SEND] = { |
fddaface JA |
1026 | .needs_file = 1, |
1027 | .unbound_nonreg_file = 1, | |
8a72758c | 1028 | .pollout = 1, |
fddaface | 1029 | }, |
0463b6c5 | 1030 | [IORING_OP_RECV] = { |
fddaface JA |
1031 | .needs_file = 1, |
1032 | .unbound_nonreg_file = 1, | |
8a72758c | 1033 | .pollin = 1, |
bcda7baa | 1034 | .buffer_select = 1, |
fddaface | 1035 | }, |
0463b6c5 | 1036 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1037 | }, |
3e4827b0 JA |
1038 | [IORING_OP_EPOLL_CTL] = { |
1039 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1040 | }, |
7d67af2c PB |
1041 | [IORING_OP_SPLICE] = { |
1042 | .needs_file = 1, | |
1043 | .hash_reg_file = 1, | |
1044 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1045 | }, |
1046 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1047 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1048 | [IORING_OP_TEE] = { |
1049 | .needs_file = 1, | |
1050 | .hash_reg_file = 1, | |
1051 | .unbound_nonreg_file = 1, | |
1052 | }, | |
36f4fa68 JA |
1053 | [IORING_OP_SHUTDOWN] = { |
1054 | .needs_file = 1, | |
1055 | }, | |
44526bed JA |
1056 | [IORING_OP_RENAMEAT] = {}, |
1057 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1058 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1059 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1060 | [IORING_OP_LINKAT] = {}, |
d3656344 JA |
1061 | }; |
1062 | ||
0756a869 PB |
1063 | /* requests with any of those set should undergo io_disarm_next() */ |
1064 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1065 | ||
7a612350 | 1066 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1067 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1068 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1069 | struct task_struct *task, | |
3dd0c97a | 1070 | bool cancel_all); |
78cc687b | 1071 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1072 | |
d4d19c19 | 1073 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1074 | s32 res, u32 cflags); |
ec9c02ad | 1075 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1076 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1077 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1078 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1079 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1080 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1081 | unsigned nr_args); |
68fb8979 | 1082 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1083 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1084 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1085 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1086 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1087 | |
907d1df3 | 1088 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1089 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1090 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1091 | |
b9445598 PB |
1092 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1093 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1094 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1095 | ||
f1042b6c | 1096 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1097 | |
2b188cc1 JA |
1098 | static struct kmem_cache *req_cachep; |
1099 | ||
0918682b | 1100 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1101 | |
1102 | struct sock *io_uring_get_socket(struct file *file) | |
1103 | { | |
1104 | #if defined(CONFIG_UNIX) | |
1105 | if (file->f_op == &io_uring_fops) { | |
1106 | struct io_ring_ctx *ctx = file->private_data; | |
1107 | ||
1108 | return ctx->ring_sock->sk; | |
1109 | } | |
1110 | #endif | |
1111 | return NULL; | |
1112 | } | |
1113 | EXPORT_SYMBOL(io_uring_get_socket); | |
1114 | ||
f237c30a PB |
1115 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1116 | { | |
1117 | if (!*locked) { | |
1118 | mutex_lock(&ctx->uring_lock); | |
1119 | *locked = true; | |
1120 | } | |
1121 | } | |
1122 | ||
f2f87370 PB |
1123 | #define io_for_each_link(pos, head) \ |
1124 | for (pos = (head); pos; pos = pos->link) | |
1125 | ||
21c843d5 PB |
1126 | /* |
1127 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1128 | * see commit f958d7b528b1 for details. | |
1129 | */ | |
1130 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1131 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1132 | ||
1133 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1134 | { | |
20e60a38 | 1135 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1136 | return atomic_inc_not_zero(&req->refs); |
1137 | } | |
1138 | ||
21c843d5 PB |
1139 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1140 | { | |
20e60a38 PB |
1141 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1142 | return true; | |
1143 | ||
21c843d5 PB |
1144 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1145 | return atomic_dec_and_test(&req->refs); | |
1146 | } | |
1147 | ||
1148 | static inline void req_ref_put(struct io_kiocb *req) | |
1149 | { | |
20e60a38 | 1150 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1151 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1152 | } | |
1153 | ||
1154 | static inline void req_ref_get(struct io_kiocb *req) | |
1155 | { | |
20e60a38 | 1156 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1157 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1158 | atomic_inc(&req->refs); | |
1159 | } | |
1160 | ||
c450178d PB |
1161 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1162 | { | |
6f33b0bc | 1163 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1164 | __io_submit_flush_completions(ctx); |
1165 | } | |
1166 | ||
48dcd38d | 1167 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1168 | { |
1169 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1170 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1171 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1172 | } |
1173 | } | |
1174 | ||
48dcd38d PB |
1175 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1176 | { | |
1177 | __io_req_set_refcount(req, 1); | |
1178 | } | |
1179 | ||
ab409402 PB |
1180 | #define IO_RSRC_REF_BATCH 100 |
1181 | ||
1182 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, | |
1183 | struct io_ring_ctx *ctx) | |
1184 | __must_hold(&ctx->uring_lock) | |
1185 | { | |
1186 | struct percpu_ref *ref = req->fixed_rsrc_refs; | |
1187 | ||
1188 | if (ref) { | |
1189 | if (ref == &ctx->rsrc_node->refs) | |
1190 | ctx->rsrc_cached_refs++; | |
1191 | else | |
1192 | percpu_ref_put(ref); | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | static inline void io_req_put_rsrc(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1197 | { | |
1198 | if (req->fixed_rsrc_refs) | |
1199 | percpu_ref_put(req->fixed_rsrc_refs); | |
1200 | } | |
1201 | ||
1202 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1203 | __must_hold(&ctx->uring_lock) | |
1204 | { | |
1205 | if (ctx->rsrc_cached_refs) { | |
1206 | percpu_ref_put_many(&ctx->rsrc_node->refs, ctx->rsrc_cached_refs); | |
1207 | ctx->rsrc_cached_refs = 0; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1212 | __must_hold(&ctx->uring_lock) | |
1213 | { | |
1214 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1215 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1216 | } | |
1217 | ||
a46be971 PB |
1218 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
1219 | struct io_ring_ctx *ctx) | |
36f72fe2 | 1220 | { |
269bbe5f | 1221 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1222 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
ab409402 PB |
1223 | ctx->rsrc_cached_refs--; |
1224 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1225 | io_rsrc_refs_refill(ctx); | |
36f72fe2 PB |
1226 | } |
1227 | } | |
1228 | ||
f70865db PB |
1229 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1230 | { | |
1231 | bool got = percpu_ref_tryget(ref); | |
1232 | ||
1233 | /* already at zero, wait for ->release() */ | |
1234 | if (!got) | |
1235 | wait_for_completion(compl); | |
1236 | percpu_ref_resurrect(ref); | |
1237 | if (got) | |
1238 | percpu_ref_put(ref); | |
1239 | } | |
1240 | ||
3dd0c97a PB |
1241 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1242 | bool cancel_all) | |
08d23634 PB |
1243 | { |
1244 | struct io_kiocb *req; | |
1245 | ||
68207680 | 1246 | if (task && head->task != task) |
08d23634 | 1247 | return false; |
3dd0c97a | 1248 | if (cancel_all) |
08d23634 PB |
1249 | return true; |
1250 | ||
1251 | io_for_each_link(req, head) { | |
b05a1bcd | 1252 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1253 | return true; |
08d23634 PB |
1254 | } |
1255 | return false; | |
1256 | } | |
1257 | ||
d886e185 PB |
1258 | static inline bool req_has_async_data(struct io_kiocb *req) |
1259 | { | |
1260 | return req->flags & REQ_F_ASYNC_DATA; | |
1261 | } | |
1262 | ||
93d2bcd2 | 1263 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1264 | { |
93d2bcd2 | 1265 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1266 | } |
4a38aed2 | 1267 | |
a8295b98 HX |
1268 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1269 | { | |
1270 | req_set_fail(req); | |
1271 | req->result = res; | |
1272 | } | |
1273 | ||
c072481d | 1274 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1275 | { |
1276 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1277 | ||
0f158b4c | 1278 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1279 | } |
1280 | ||
8eb7e2d0 PB |
1281 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1282 | { | |
1283 | return !req->timeout.off; | |
1284 | } | |
1285 | ||
c072481d | 1286 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1287 | { |
1288 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1289 | fallback_work.work); | |
1290 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1291 | struct io_kiocb *req, *tmp; | |
f237c30a | 1292 | bool locked = false; |
f56165e6 PB |
1293 | |
1294 | percpu_ref_get(&ctx->refs); | |
1295 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1296 | req->io_task_work.func(req, &locked); |
5636c00d | 1297 | |
f237c30a | 1298 | if (locked) { |
c450178d | 1299 | io_submit_flush_completions(ctx); |
f237c30a PB |
1300 | mutex_unlock(&ctx->uring_lock); |
1301 | } | |
f56165e6 PB |
1302 | percpu_ref_put(&ctx->refs); |
1303 | } | |
1304 | ||
c072481d | 1305 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1306 | { |
1307 | struct io_ring_ctx *ctx; | |
78076bb6 | 1308 | int hash_bits; |
2b188cc1 JA |
1309 | |
1310 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1311 | if (!ctx) | |
1312 | return NULL; | |
1313 | ||
78076bb6 JA |
1314 | /* |
1315 | * Use 5 bits less than the max cq entries, that should give us around | |
1316 | * 32 entries per hash list if totally full and uniformly spread. | |
1317 | */ | |
1318 | hash_bits = ilog2(p->cq_entries); | |
1319 | hash_bits -= 5; | |
1320 | if (hash_bits <= 0) | |
1321 | hash_bits = 1; | |
1322 | ctx->cancel_hash_bits = hash_bits; | |
1323 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1324 | GFP_KERNEL); | |
1325 | if (!ctx->cancel_hash) | |
1326 | goto err; | |
1327 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1328 | ||
6224843d PB |
1329 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1330 | if (!ctx->dummy_ubuf) | |
1331 | goto err; | |
1332 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1333 | ctx->dummy_ubuf->ubuf = -1UL; | |
1334 | ||
21482896 | 1335 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1336 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1337 | goto err; | |
2b188cc1 JA |
1338 | |
1339 | ctx->flags = p->flags; | |
90554200 | 1340 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1341 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1342 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1343 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1344 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1345 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1346 | mutex_init(&ctx->uring_lock); |
311997b3 | 1347 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1348 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1349 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1350 | INIT_WQ_LIST(&ctx->iopoll_list); |
de0617e4 | 1351 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1352 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1353 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1354 | spin_lock_init(&ctx->rsrc_ref_lock); |
1355 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1356 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1357 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1358 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1359 | ctx->submit_state.free_list.next = NULL; |
1360 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1361 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1362 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1363 | return ctx; |
206aefde | 1364 | err: |
6224843d | 1365 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1366 | kfree(ctx->cancel_hash); |
206aefde JA |
1367 | kfree(ctx); |
1368 | return NULL; | |
2b188cc1 JA |
1369 | } |
1370 | ||
8f6ed49a PB |
1371 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1372 | { | |
1373 | struct io_rings *r = ctx->rings; | |
1374 | ||
1375 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1376 | ctx->cq_extra--; | |
1377 | } | |
1378 | ||
9cf7c104 | 1379 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1380 | { |
2bc9930e JA |
1381 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1382 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1383 | |
8f6ed49a | 1384 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1385 | } |
de0617e4 | 1386 | |
9d858b21 | 1387 | return false; |
de0617e4 JA |
1388 | } |
1389 | ||
35645ac3 PB |
1390 | #define FFS_NOWAIT 0x1UL |
1391 | #define FFS_ISREG 0x2UL | |
1392 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG) | |
c97d8a0f PB |
1393 | |
1394 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1395 | { | |
35645ac3 | 1396 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1397 | } |
1398 | ||
c072481d | 1399 | static inline void io_req_track_inflight(struct io_kiocb *req) |
ce3d5aae | 1400 | { |
ce3d5aae | 1401 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1402 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1403 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1404 | } |
1405 | } | |
1406 | ||
906c6caa PB |
1407 | static inline void io_unprep_linked_timeout(struct io_kiocb *req) |
1408 | { | |
1409 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
1410 | } | |
1411 | ||
fd08e530 PB |
1412 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1413 | { | |
906c6caa PB |
1414 | if (WARN_ON_ONCE(!req->link)) |
1415 | return NULL; | |
1416 | ||
4d13d1a4 PB |
1417 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1418 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1419 | |
1420 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1421 | io_req_set_refcount(req); |
4d13d1a4 PB |
1422 | __io_req_set_refcount(req->link, 2); |
1423 | return req->link; | |
fd08e530 PB |
1424 | } |
1425 | ||
1426 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1427 | { | |
4d13d1a4 | 1428 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1429 | return NULL; |
1430 | return __io_prep_linked_timeout(req); | |
1431 | } | |
1432 | ||
1e6fa521 JA |
1433 | static void io_prep_async_work(struct io_kiocb *req) |
1434 | { | |
1435 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1436 | struct io_ring_ctx *ctx = req->ctx; |
1437 | ||
b8e64b53 PB |
1438 | if (!(req->flags & REQ_F_CREDS)) { |
1439 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1440 | req->creds = get_current_cred(); |
b8e64b53 | 1441 | } |
003e8dcc | 1442 | |
e1d675df PB |
1443 | req->work.list.next = NULL; |
1444 | req->work.flags = 0; | |
feaadc4f PB |
1445 | if (req->flags & REQ_F_FORCE_ASYNC) |
1446 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1447 | ||
1e6fa521 JA |
1448 | if (req->flags & REQ_F_ISREG) { |
1449 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1450 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1451 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1452 | if (def->unbound_nonreg_file) |
1453 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1454 | } | |
e1d675df PB |
1455 | |
1456 | switch (req->opcode) { | |
1457 | case IORING_OP_SPLICE: | |
1458 | case IORING_OP_TEE: | |
e1d675df PB |
1459 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1460 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1461 | break; | |
1462 | } | |
561fb04a | 1463 | } |
cccf0ee8 | 1464 | |
cbdcb435 | 1465 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1466 | { |
cbdcb435 | 1467 | struct io_kiocb *cur; |
54a91f3b | 1468 | |
44eff40a PB |
1469 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1470 | struct io_ring_ctx *ctx = req->ctx; | |
1471 | ||
79ebeaee | 1472 | spin_lock(&ctx->completion_lock); |
44eff40a PB |
1473 | io_for_each_link(cur, req) |
1474 | io_prep_async_work(cur); | |
79ebeaee | 1475 | spin_unlock(&ctx->completion_lock); |
44eff40a PB |
1476 | } else { |
1477 | io_for_each_link(cur, req) | |
1478 | io_prep_async_work(cur); | |
1479 | } | |
561fb04a JA |
1480 | } |
1481 | ||
fff4e40e PB |
1482 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1483 | { | |
1484 | struct io_submit_state *state = &req->ctx->submit_state; | |
1485 | ||
1486 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); | |
1487 | } | |
1488 | ||
f237c30a | 1489 | static void io_queue_async_work(struct io_kiocb *req, bool *locked) |
561fb04a | 1490 | { |
a197f664 | 1491 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1492 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1493 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1494 | |
f237c30a PB |
1495 | /* must not take the lock, NULL it as a precaution */ |
1496 | locked = NULL; | |
1497 | ||
3bfe6106 JA |
1498 | BUG_ON(!tctx); |
1499 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1500 | |
cbdcb435 PB |
1501 | /* init ->work of the whole link before punting */ |
1502 | io_prep_async_link(req); | |
991468dc JA |
1503 | |
1504 | /* | |
1505 | * Not expected to happen, but if we do have a bug where this _can_ | |
1506 | * happen, catch it here and ensure the request is marked as | |
1507 | * canceled. That will make io-wq go through the usual work cancel | |
1508 | * procedure rather than attempt to run this request (or create a new | |
1509 | * worker for it). | |
1510 | */ | |
1511 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1512 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1513 | ||
d07f1e8a PB |
1514 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1515 | &req->work, req->flags); | |
ebf93667 | 1516 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1517 | if (link) |
1518 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1519 | } |
1520 | ||
1ee4160c | 1521 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1522 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1523 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1524 | { |
e8c2bc1f | 1525 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1526 | |
fd9c7bc5 | 1527 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1528 | if (status) |
1529 | req_set_fail(req); | |
01cec8c1 PB |
1530 | atomic_set(&req->ctx->cq_timeouts, |
1531 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1532 | list_del_init(&req->timeout.list); |
d4d19c19 | 1533 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
91c2f697 | 1534 | io_put_req_deferred(req); |
5262f567 JA |
1535 | } |
1536 | } | |
1537 | ||
c072481d | 1538 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1539 | { |
441b8a78 | 1540 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1541 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1542 | struct io_defer_entry, list); | |
de0617e4 | 1543 | |
9cf7c104 | 1544 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1545 | break; |
27dc8338 | 1546 | list_del_init(&de->list); |
907d1df3 | 1547 | io_req_task_queue(de->req); |
27dc8338 | 1548 | kfree(de); |
441b8a78 | 1549 | } |
04518945 PB |
1550 | } |
1551 | ||
c072481d | 1552 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1553 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1554 | { |
441b8a78 | 1555 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1556 | |
79ebeaee | 1557 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1558 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1559 | u32 events_needed, events_got; |
360428f8 | 1560 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1561 | struct io_kiocb, timeout.list); |
de0617e4 | 1562 | |
8eb7e2d0 | 1563 | if (io_is_timeout_noseq(req)) |
360428f8 | 1564 | break; |
f010505b MDG |
1565 | |
1566 | /* | |
1567 | * Since seq can easily wrap around over time, subtract | |
1568 | * the last seq at which timeouts were flushed before comparing. | |
1569 | * Assuming not more than 2^31-1 events have happened since, | |
1570 | * these subtractions won't have wrapped, so we can check if | |
1571 | * target is in [last_seq, current_seq] by comparing the two. | |
1572 | */ | |
1573 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1574 | events_got = seq - ctx->cq_last_tm_flush; | |
1575 | if (events_got < events_needed) | |
360428f8 | 1576 | break; |
bfe68a22 | 1577 | |
135fcde8 | 1578 | list_del_init(&req->timeout.list); |
1ee4160c | 1579 | io_kill_timeout(req, 0); |
f18ee4cf | 1580 | } |
f010505b | 1581 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1582 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1583 | } |
5262f567 | 1584 | |
c072481d | 1585 | static __cold void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1586 | { |
2335f6f5 PB |
1587 | if (ctx->off_timeout_used) |
1588 | io_flush_timeouts(ctx); | |
1589 | if (ctx->drain_active) | |
1590 | io_queue_deferred(ctx); | |
1591 | } | |
1592 | ||
1593 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1594 | { | |
1595 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1596 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1597 | /* order cqe stores with ring update */ |
1598 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1599 | } |
1600 | ||
90554200 JA |
1601 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1602 | { | |
1603 | struct io_rings *r = ctx->rings; | |
1604 | ||
a566c556 | 1605 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1606 | } |
1607 | ||
888aae2e PB |
1608 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1609 | { | |
1610 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1611 | } | |
1612 | ||
d068b506 | 1613 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1614 | { |
75b28aff | 1615 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1616 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1617 | |
115e12e5 SB |
1618 | /* |
1619 | * writes to the cq entry need to come after reading head; the | |
1620 | * control dependency is enough as we're using WRITE_ONCE to | |
1621 | * fill the cq entry | |
1622 | */ | |
a566c556 | 1623 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1624 | return NULL; |
1625 | ||
888aae2e | 1626 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1627 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1628 | } |
1629 | ||
f2842ab5 JA |
1630 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1631 | { | |
44c769de | 1632 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1633 | return false; |
7e55a19c SG |
1634 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1635 | return false; | |
44c769de | 1636 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1637 | } |
1638 | ||
2c5d763c JA |
1639 | /* |
1640 | * This should only get called when at least one event has been posted. | |
1641 | * Some applications rely on the eventfd notification count only changing | |
1642 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1643 | * 1:1 relationship between how many times this function is called (and | |
1644 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1645 | */ | |
b41e9852 | 1646 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1647 | { |
5fd46178 JA |
1648 | /* |
1649 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1650 | * io_should_wake() handle the termination of the loop and only | |
1651 | * wake as many waiters as we need to. | |
1652 | */ | |
1653 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1654 | wake_up_all(&ctx->cq_wait); | |
b41e9852 | 1655 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1656 | eventfd_signal(ctx->cq_ev_fd, 1); |
1657 | } | |
1658 | ||
80c18e4a PB |
1659 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1660 | { | |
c57a91fb PB |
1661 | /* see waitqueue_active() comment */ |
1662 | smp_mb(); | |
1663 | ||
80c18e4a | 1664 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c57a91fb | 1665 | if (waitqueue_active(&ctx->cq_wait)) |
5fd46178 | 1666 | wake_up_all(&ctx->cq_wait); |
80c18e4a PB |
1667 | } |
1668 | if (io_should_trigger_evfd(ctx)) | |
1669 | eventfd_signal(ctx->cq_ev_fd, 1); | |
1670 | } | |
1671 | ||
c4a2ed72 | 1672 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1673 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1674 | { |
b18032bb | 1675 | bool all_flushed, posted; |
1d7bb1d5 | 1676 | |
a566c556 | 1677 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1678 | return false; |
1d7bb1d5 | 1679 | |
b18032bb | 1680 | posted = false; |
79ebeaee | 1681 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1682 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1683 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1684 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1685 | |
1d7bb1d5 JA |
1686 | if (!cqe && !force) |
1687 | break; | |
6c2450ae PB |
1688 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1689 | struct io_overflow_cqe, list); | |
1690 | if (cqe) | |
1691 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1692 | else | |
8f6ed49a PB |
1693 | io_account_cq_overflow(ctx); |
1694 | ||
b18032bb | 1695 | posted = true; |
6c2450ae PB |
1696 | list_del(&ocqe->list); |
1697 | kfree(ocqe); | |
1d7bb1d5 JA |
1698 | } |
1699 | ||
09e88404 PB |
1700 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1701 | if (all_flushed) { | |
5ed7a37d | 1702 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1703 | WRITE_ONCE(ctx->rings->sq_flags, |
1704 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1705 | } |
46930143 | 1706 | |
b18032bb JA |
1707 | if (posted) |
1708 | io_commit_cqring(ctx); | |
79ebeaee | 1709 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1710 | if (posted) |
1711 | io_cqring_ev_posted(ctx); | |
09e88404 | 1712 | return all_flushed; |
1d7bb1d5 JA |
1713 | } |
1714 | ||
90f67366 | 1715 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1716 | { |
ca0a2651 JA |
1717 | bool ret = true; |
1718 | ||
5ed7a37d | 1719 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1720 | /* iopoll syncs against uring_lock, not completion_lock */ |
1721 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1722 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1723 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1724 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1725 | mutex_unlock(&ctx->uring_lock); | |
1726 | } | |
ca0a2651 JA |
1727 | |
1728 | return ret; | |
6c503150 PB |
1729 | } |
1730 | ||
6a290a14 PB |
1731 | /* must to be called somewhat shortly after putting a request */ |
1732 | static inline void io_put_task(struct task_struct *task, int nr) | |
1733 | { | |
1734 | struct io_uring_task *tctx = task->io_uring; | |
1735 | ||
e98e49b2 PB |
1736 | if (likely(task == current)) { |
1737 | tctx->cached_refs += nr; | |
1738 | } else { | |
1739 | percpu_counter_sub(&tctx->inflight, nr); | |
1740 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1741 | wake_up(&tctx->wait); | |
1742 | put_task_struct_many(task, nr); | |
1743 | } | |
6a290a14 PB |
1744 | } |
1745 | ||
9a10867a PB |
1746 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1747 | { | |
1748 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1749 | ||
1750 | percpu_counter_add(&tctx->inflight, refill); | |
1751 | refcount_add(refill, ¤t->usage); | |
1752 | tctx->cached_refs += refill; | |
1753 | } | |
1754 | ||
1755 | static inline void io_get_task_refs(int nr) | |
1756 | { | |
1757 | struct io_uring_task *tctx = current->io_uring; | |
1758 | ||
1759 | tctx->cached_refs -= nr; | |
1760 | if (unlikely(tctx->cached_refs < 0)) | |
1761 | io_task_refs_refill(tctx); | |
1762 | } | |
1763 | ||
d4d19c19 | 1764 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1765 | s32 res, u32 cflags) |
2b188cc1 | 1766 | { |
cce4b8b0 | 1767 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1768 | |
cce4b8b0 PB |
1769 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1770 | if (!ocqe) { | |
1771 | /* | |
1772 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1773 | * or cannot allocate an overflow entry, then we need to drop it | |
1774 | * on the floor. | |
1775 | */ | |
8f6ed49a | 1776 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1777 | return false; |
2b188cc1 | 1778 | } |
cce4b8b0 | 1779 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1780 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1781 | WRITE_ONCE(ctx->rings->sq_flags, |
1782 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1783 | ||
cce4b8b0 | 1784 | } |
d4d19c19 | 1785 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1786 | ocqe->cqe.res = res; |
1787 | ocqe->cqe.flags = cflags; | |
1788 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1789 | return true; | |
2b188cc1 JA |
1790 | } |
1791 | ||
d4d19c19 | 1792 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1793 | s32 res, u32 cflags) |
2b188cc1 JA |
1794 | { |
1795 | struct io_uring_cqe *cqe; | |
1796 | ||
d4d19c19 | 1797 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1798 | |
2b188cc1 JA |
1799 | /* |
1800 | * If we can't get a cq entry, userspace overflowed the | |
1801 | * submission (by quite a lot). Increment the overflow count in | |
1802 | * the ring. | |
1803 | */ | |
d068b506 | 1804 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1805 | if (likely(cqe)) { |
d4d19c19 | 1806 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1807 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1808 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1809 | return true; |
2b188cc1 | 1810 | } |
d4d19c19 | 1811 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1812 | } |
1813 | ||
8d13326e | 1814 | /* not as hot to bloat with inlining */ |
d4d19c19 | 1815 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1816 | s32 res, u32 cflags) |
bcda7baa | 1817 | { |
d4d19c19 | 1818 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1819 | } |
1820 | ||
54daa9b2 PB |
1821 | static void io_req_complete_post(struct io_kiocb *req, s32 res, |
1822 | u32 cflags) | |
2b188cc1 | 1823 | { |
78e19bbe | 1824 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1825 | |
79ebeaee | 1826 | spin_lock(&ctx->completion_lock); |
d4d19c19 | 1827 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1828 | /* |
1829 | * If we're the last reference to this request, add to our locked | |
1830 | * free_list cache. | |
1831 | */ | |
de9b4cca | 1832 | if (req_ref_put_and_test(req)) { |
7a612350 | 1833 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1834 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1835 | io_disarm_next(req); |
1836 | if (req->link) { | |
1837 | io_req_task_queue(req->link); | |
1838 | req->link = NULL; | |
1839 | } | |
1840 | } | |
ab409402 | 1841 | io_req_put_rsrc(req, ctx); |
c7dae4ba JA |
1842 | io_dismantle_req(req); |
1843 | io_put_task(req->task, 1); | |
c2b6c6bc | 1844 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 1845 | ctx->locked_free_nr++; |
180f829f | 1846 | } |
7a612350 | 1847 | io_commit_cqring(ctx); |
79ebeaee | 1848 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 1849 | io_cqring_ev_posted(ctx); |
229a7b63 JA |
1850 | } |
1851 | ||
54daa9b2 PB |
1852 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
1853 | u32 cflags) | |
229a7b63 | 1854 | { |
a38d68db | 1855 | req->result = res; |
d17e56eb | 1856 | req->cflags = cflags; |
e342c807 | 1857 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1858 | } |
1859 | ||
889fca73 | 1860 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 1861 | s32 res, u32 cflags) |
bcda7baa | 1862 | { |
889fca73 PB |
1863 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1864 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1865 | else |
c7dae4ba | 1866 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1867 | } |
1868 | ||
54daa9b2 | 1869 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 1870 | { |
889fca73 | 1871 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1872 | } |
1873 | ||
54daa9b2 | 1874 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 1875 | { |
93d2bcd2 | 1876 | req_set_fail(req); |
f41db273 PB |
1877 | io_req_complete_post(req, res, 0); |
1878 | } | |
1879 | ||
c6d3d9cb PB |
1880 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1881 | { | |
1882 | /* | |
1883 | * We don't submit, fail them all, for that replace hardlinks with | |
1884 | * normal links. Extra REQ_F_LINK is tolerated. | |
1885 | */ | |
1886 | req->flags &= ~REQ_F_HARDLINK; | |
1887 | req->flags |= REQ_F_LINK; | |
1888 | io_req_complete_failed(req, req->result); | |
1889 | } | |
1890 | ||
864ea921 PB |
1891 | /* |
1892 | * Don't initialise the fields below on every allocation, but do that in | |
1893 | * advance and keep them valid across allocations. | |
1894 | */ | |
1895 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1896 | { | |
1897 | req->ctx = ctx; | |
1898 | req->link = NULL; | |
1899 | req->async_data = NULL; | |
1900 | /* not necessary, but safer to zero */ | |
1901 | req->result = 0; | |
1902 | } | |
1903 | ||
dac7a098 | 1904 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1905 | struct io_submit_state *state) |
dac7a098 | 1906 | { |
79ebeaee | 1907 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 1908 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1909 | ctx->locked_free_nr = 0; |
79ebeaee | 1910 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1911 | } |
1912 | ||
dd78f492 | 1913 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1914 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1915 | { |
c7dae4ba | 1916 | struct io_submit_state *state = &ctx->submit_state; |
0ddf92e8 | 1917 | |
c7dae4ba JA |
1918 | /* |
1919 | * If we have more than a batch's worth of requests in our IRQ side | |
1920 | * locked cache, grab the lock and move them over to our submission | |
1921 | * side cache. | |
1922 | */ | |
d0acdee2 | 1923 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 1924 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc | 1925 | return !!state->free_list.next; |
0ddf92e8 JA |
1926 | } |
1927 | ||
5d5901a3 PB |
1928 | /* |
1929 | * A request might get retired back into the request caches even before opcode | |
1930 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
1931 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
1932 | * and with extra caution to not get a request that is still worked on. | |
1933 | */ | |
c072481d | 1934 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 1935 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 1936 | { |
e5d1bc0a | 1937 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 | 1938 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 PB |
1939 | void *reqs[IO_REQ_ALLOC_BATCH]; |
1940 | struct io_kiocb *req; | |
864ea921 | 1941 | int ret, i; |
e5d1bc0a | 1942 | |
c2b6c6bc | 1943 | if (likely(state->free_list.next || io_flush_cached_reqs(ctx))) |
a33ae9ce | 1944 | return true; |
e5d1bc0a | 1945 | |
3ab665b7 | 1946 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 1947 | |
864ea921 PB |
1948 | /* |
1949 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1950 | * retry single alloc to be on the safe side. | |
1951 | */ | |
1952 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
1953 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
1954 | if (!reqs[0]) | |
a33ae9ce | 1955 | return false; |
864ea921 | 1956 | ret = 1; |
2b188cc1 | 1957 | } |
864ea921 | 1958 | |
37f0e767 | 1959 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 PB |
1960 | for (i = 0; i < ret; i++) { |
1961 | req = reqs[i]; | |
1962 | ||
1963 | io_preinit_req(req, ctx); | |
c2b6c6bc | 1964 | wq_stack_add_head(&req->comp_list, &state->free_list); |
3ab665b7 | 1965 | } |
a33ae9ce PB |
1966 | return true; |
1967 | } | |
1968 | ||
1969 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
1970 | { | |
1971 | if (unlikely(!ctx->submit_state.free_list.next)) | |
1972 | return __io_alloc_req_refill(ctx); | |
1973 | return true; | |
1974 | } | |
1975 | ||
1976 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
1977 | { | |
1978 | struct io_wq_work_node *node; | |
1979 | ||
1980 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 1981 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
1982 | } |
1983 | ||
e1d767f0 | 1984 | static inline void io_put_file(struct file *file) |
8da11c19 | 1985 | { |
e1d767f0 | 1986 | if (file) |
8da11c19 PB |
1987 | fput(file); |
1988 | } | |
1989 | ||
6b639522 | 1990 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1991 | { |
094bae49 | 1992 | unsigned int flags = req->flags; |
929a3af9 | 1993 | |
867f8fa5 | 1994 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 1995 | io_clean_op(req); |
e1d767f0 PB |
1996 | if (!(flags & REQ_F_FIXED_FILE)) |
1997 | io_put_file(req->file); | |
e65ef56d JA |
1998 | } |
1999 | ||
c072481d | 2000 | static __cold void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2001 | { |
51a4cc11 | 2002 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2003 | |
ab409402 | 2004 | io_req_put_rsrc(req, ctx); |
216578e5 | 2005 | io_dismantle_req(req); |
7c660731 | 2006 | io_put_task(req->task, 1); |
c6ca97b3 | 2007 | |
79ebeaee | 2008 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2009 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2010 | ctx->locked_free_nr++; |
79ebeaee | 2011 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2012 | } |
2013 | ||
f2f87370 PB |
2014 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2015 | { | |
2016 | struct io_kiocb *nxt = req->link; | |
2017 | ||
2018 | req->link = nxt->link; | |
2019 | nxt->link = NULL; | |
2020 | } | |
2021 | ||
33cc89a9 PB |
2022 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2023 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2024 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2025 | { |
33cc89a9 | 2026 | struct io_kiocb *link = req->link; |
f2f87370 | 2027 | |
b97e736a | 2028 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2029 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2030 | |
f2f87370 | 2031 | io_remove_next_linked(req); |
90cd7e42 | 2032 | link->timeout.head = NULL; |
fd9c7bc5 | 2033 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2034 | list_del(&link->timeout.list); |
d4d19c19 PB |
2035 | io_cqring_fill_event(link->ctx, link->user_data, |
2036 | -ECANCELED, 0); | |
91c2f697 | 2037 | io_put_req_deferred(link); |
d4729fbd | 2038 | return true; |
c9abd7ad PB |
2039 | } |
2040 | } | |
d4729fbd | 2041 | return false; |
7c86ffee PB |
2042 | } |
2043 | ||
d148ca4b | 2044 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2045 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2046 | { |
33cc89a9 | 2047 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 2048 | |
f2f87370 | 2049 | req->link = NULL; |
f2f87370 | 2050 | while (link) { |
a8295b98 HX |
2051 | long res = -ECANCELED; |
2052 | ||
2053 | if (link->flags & REQ_F_FAIL) | |
2054 | res = link->result; | |
2055 | ||
f2f87370 PB |
2056 | nxt = link->link; |
2057 | link->link = NULL; | |
2665abfd | 2058 | |
f2f87370 | 2059 | trace_io_uring_fail_link(req, link); |
a8295b98 | 2060 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
91c2f697 | 2061 | io_put_req_deferred(link); |
f2f87370 | 2062 | link = nxt; |
9e645e11 | 2063 | } |
33cc89a9 | 2064 | } |
9e645e11 | 2065 | |
33cc89a9 PB |
2066 | static bool io_disarm_next(struct io_kiocb *req) |
2067 | __must_hold(&req->ctx->completion_lock) | |
2068 | { | |
2069 | bool posted = false; | |
2070 | ||
0756a869 PB |
2071 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2072 | struct io_kiocb *link = req->link; | |
2073 | ||
906c6caa | 2074 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2075 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2076 | io_remove_next_linked(req); | |
2077 | io_cqring_fill_event(link->ctx, link->user_data, | |
2078 | -ECANCELED, 0); | |
2079 | io_put_req_deferred(link); | |
2080 | posted = true; | |
2081 | } | |
2082 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2083 | struct io_ring_ctx *ctx = req->ctx; |
2084 | ||
2085 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2086 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2087 | spin_unlock_irq(&ctx->timeout_lock); |
2088 | } | |
93d2bcd2 | 2089 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2090 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2091 | posted |= (req->link != NULL); |
2092 | io_fail_links(req); | |
2093 | } | |
2094 | return posted; | |
9e645e11 JA |
2095 | } |
2096 | ||
d81499bf PB |
2097 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2098 | { | |
2099 | struct io_ring_ctx *ctx = req->ctx; | |
2100 | bool posted; | |
2101 | ||
2102 | spin_lock(&ctx->completion_lock); | |
2103 | posted = io_disarm_next(req); | |
2104 | if (posted) | |
2105 | io_commit_cqring(req->ctx); | |
2106 | spin_unlock(&ctx->completion_lock); | |
2107 | if (posted) | |
2108 | io_cqring_ev_posted(ctx); | |
2109 | } | |
2110 | ||
2111 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2112 | { |
33cc89a9 | 2113 | struct io_kiocb *nxt; |
944e58bf | 2114 | |
d81499bf PB |
2115 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
2116 | return NULL; | |
9e645e11 JA |
2117 | /* |
2118 | * If LINK is set, we have dependent requests in this chain. If we | |
2119 | * didn't fail this request, queue the first one up, moving any other | |
2120 | * dependencies to the next request. In case of failure, fail the rest | |
2121 | * of the chain. | |
2122 | */ | |
d81499bf PB |
2123 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2124 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2125 | nxt = req->link; |
2126 | req->link = NULL; | |
2127 | return nxt; | |
4d7dd462 | 2128 | } |
9e645e11 | 2129 | |
f237c30a | 2130 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2131 | { |
2132 | if (!ctx) | |
2133 | return; | |
f237c30a | 2134 | if (*locked) { |
c450178d | 2135 | io_submit_flush_completions(ctx); |
2c32395d | 2136 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2137 | *locked = false; |
2c32395d PB |
2138 | } |
2139 | percpu_ref_put(&ctx->refs); | |
2140 | } | |
2141 | ||
7cbf1722 | 2142 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2143 | { |
f237c30a | 2144 | bool locked = false; |
ebd0df2e | 2145 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2146 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2147 | task_work); | |
c40f6379 | 2148 | |
16f72070 | 2149 | while (1) { |
3f18407d PB |
2150 | struct io_wq_work_node *node; |
2151 | ||
c450178d | 2152 | if (!tctx->task_list.first && locked) |
8d4ad41e PB |
2153 | io_submit_flush_completions(ctx); |
2154 | ||
3f18407d | 2155 | spin_lock_irq(&tctx->task_lock); |
c6538be9 | 2156 | node = tctx->task_list.first; |
3f18407d | 2157 | INIT_WQ_LIST(&tctx->task_list); |
6294f368 PB |
2158 | if (!node) |
2159 | tctx->task_running = false; | |
3f18407d | 2160 | spin_unlock_irq(&tctx->task_lock); |
6294f368 PB |
2161 | if (!node) |
2162 | break; | |
3f18407d | 2163 | |
6294f368 | 2164 | do { |
3f18407d PB |
2165 | struct io_wq_work_node *next = node->next; |
2166 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2167 | io_task_work.node); | |
2168 | ||
2169 | if (req->ctx != ctx) { | |
f237c30a | 2170 | ctx_flush_and_put(ctx, &locked); |
3f18407d | 2171 | ctx = req->ctx; |
126180b9 PB |
2172 | /* if not contended, grab and improve batching */ |
2173 | locked = mutex_trylock(&ctx->uring_lock); | |
3f18407d PB |
2174 | percpu_ref_get(&ctx->refs); |
2175 | } | |
f237c30a | 2176 | req->io_task_work.func(req, &locked); |
3f18407d | 2177 | node = next; |
6294f368 PB |
2178 | } while (node); |
2179 | ||
7cbf1722 | 2180 | cond_resched(); |
3f18407d | 2181 | } |
ebd0df2e | 2182 | |
f237c30a | 2183 | ctx_flush_and_put(ctx, &locked); |
7cbf1722 JA |
2184 | } |
2185 | ||
e09ee510 | 2186 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 2187 | { |
c15b79de | 2188 | struct task_struct *tsk = req->task; |
7cbf1722 | 2189 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2190 | enum task_work_notify_mode notify; |
e09ee510 | 2191 | struct io_wq_work_node *node; |
0b81e80c | 2192 | unsigned long flags; |
6294f368 | 2193 | bool running; |
7cbf1722 JA |
2194 | |
2195 | WARN_ON_ONCE(!tctx); | |
2196 | ||
0b81e80c | 2197 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2198 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
6294f368 PB |
2199 | running = tctx->task_running; |
2200 | if (!running) | |
2201 | tctx->task_running = true; | |
0b81e80c | 2202 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2203 | |
2204 | /* task_work already pending, we're done */ | |
6294f368 | 2205 | if (running) |
e09ee510 | 2206 | return; |
7cbf1722 | 2207 | |
c15b79de PB |
2208 | /* |
2209 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2210 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2211 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2212 | * will do the job. | |
2213 | */ | |
2214 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
d97ec623 PB |
2215 | if (likely(!task_work_add(tsk, &tctx->task_work, notify))) { |
2216 | if (notify == TWA_NONE) | |
2217 | wake_up_process(tsk); | |
e09ee510 | 2218 | return; |
c15b79de | 2219 | } |
2215bed9 | 2220 | |
0b81e80c | 2221 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2222 | tctx->task_running = false; |
e09ee510 PB |
2223 | node = tctx->task_list.first; |
2224 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2225 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2226 | |
e09ee510 PB |
2227 | while (node) { |
2228 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2229 | node = node->next; | |
2230 | if (llist_add(&req->io_task_work.fallback_node, | |
2231 | &req->ctx->fallback_llist)) | |
2232 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2233 | } | |
eab30c4d PB |
2234 | } |
2235 | ||
f237c30a | 2236 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2237 | { |
87ceb6a6 | 2238 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2239 | |
b18a1a45 | 2240 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2241 | io_tw_lock(ctx, locked); |
2593553a | 2242 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2243 | } |
2244 | ||
f237c30a | 2245 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2246 | { |
2247 | struct io_ring_ctx *ctx = req->ctx; | |
2248 | ||
f237c30a | 2249 | io_tw_lock(ctx, locked); |
316319e8 | 2250 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2251 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2252 | __io_queue_sqe(req); |
81b6d05c | 2253 | else |
2593553a | 2254 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2255 | } |
2256 | ||
2c4b8eb6 | 2257 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2258 | { |
2c4b8eb6 | 2259 | req->result = ret; |
5b0a6acc | 2260 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2261 | io_req_task_work_add(req); |
c40f6379 JA |
2262 | } |
2263 | ||
2c4b8eb6 | 2264 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2265 | { |
5b0a6acc | 2266 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2267 | io_req_task_work_add(req); |
a3df7698 PB |
2268 | } |
2269 | ||
773af691 JA |
2270 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2271 | { | |
2272 | req->io_task_work.func = io_queue_async_work; | |
2273 | io_req_task_work_add(req); | |
2274 | } | |
2275 | ||
f2f87370 | 2276 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2277 | { |
9b5f7bd9 | 2278 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2279 | |
2280 | if (nxt) | |
906a8c3f | 2281 | io_req_task_queue(nxt); |
c69f8dbe JL |
2282 | } |
2283 | ||
c3524383 | 2284 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2285 | { |
c3524383 PB |
2286 | io_queue_next(req); |
2287 | __io_free_req(req); | |
2288 | } | |
8766dd51 | 2289 | |
f237c30a PB |
2290 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2291 | { | |
2292 | io_free_req(req); | |
2293 | } | |
2294 | ||
3aa83bfb | 2295 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 2296 | struct io_wq_work_node *node) |
3aa83bfb PB |
2297 | __must_hold(&ctx->uring_lock) |
2298 | { | |
d4b7a5ef | 2299 | struct task_struct *task = NULL; |
37f0e767 | 2300 | int task_refs = 0; |
3aa83bfb | 2301 | |
3aa83bfb PB |
2302 | do { |
2303 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2304 | comp_list); | |
2305 | ||
def77acf | 2306 | if (unlikely(req->flags & REQ_F_REFCOUNT)) { |
c1e53a69 | 2307 | node = req->comp_list.next; |
def77acf PB |
2308 | if (!req_ref_put_and_test(req)) |
2309 | continue; | |
c1e53a69 | 2310 | } |
d4b7a5ef | 2311 | |
ab409402 | 2312 | io_req_put_rsrc_locked(req, ctx); |
d4b7a5ef PB |
2313 | io_queue_next(req); |
2314 | io_dismantle_req(req); | |
2315 | ||
2316 | if (req->task != task) { | |
2317 | if (task) | |
2318 | io_put_task(task, task_refs); | |
2319 | task = req->task; | |
2320 | task_refs = 0; | |
2321 | } | |
2322 | task_refs++; | |
c1e53a69 | 2323 | node = req->comp_list.next; |
d4b7a5ef | 2324 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
3aa83bfb | 2325 | } while (node); |
d4b7a5ef | 2326 | |
d4b7a5ef PB |
2327 | if (task) |
2328 | io_put_task(task, task_refs); | |
3aa83bfb PB |
2329 | } |
2330 | ||
c450178d | 2331 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2332 | __must_hold(&ctx->uring_lock) |
905c172f | 2333 | { |
6f33b0bc | 2334 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 2335 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 2336 | |
79ebeaee | 2337 | spin_lock(&ctx->completion_lock); |
6f33b0bc PB |
2338 | wq_list_for_each(node, prev, &state->compl_reqs) { |
2339 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2340 | comp_list); | |
5182ed2e | 2341 | |
d4d19c19 | 2342 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
d17e56eb | 2343 | req->cflags); |
905c172f PB |
2344 | } |
2345 | io_commit_cqring(ctx); | |
79ebeaee | 2346 | spin_unlock(&ctx->completion_lock); |
905c172f | 2347 | io_cqring_ev_posted(ctx); |
5182ed2e | 2348 | |
1cce17ac | 2349 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 2350 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
2351 | } |
2352 | ||
ba816ad6 JA |
2353 | /* |
2354 | * Drop reference to request, return next in chain (if there is one) if this | |
2355 | * was the last reference to this request. | |
2356 | */ | |
0d85035a | 2357 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2358 | { |
9b5f7bd9 PB |
2359 | struct io_kiocb *nxt = NULL; |
2360 | ||
de9b4cca | 2361 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2362 | nxt = io_req_find_next(req); |
4d7dd462 | 2363 | __io_free_req(req); |
2a44f467 | 2364 | } |
9b5f7bd9 | 2365 | return nxt; |
2b188cc1 JA |
2366 | } |
2367 | ||
0d85035a | 2368 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2369 | { |
de9b4cca | 2370 | if (req_ref_put_and_test(req)) |
e65ef56d | 2371 | io_free_req(req); |
2b188cc1 JA |
2372 | } |
2373 | ||
91c2f697 | 2374 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2375 | { |
91c2f697 | 2376 | if (req_ref_put_and_test(req)) { |
f237c30a | 2377 | req->io_task_work.func = io_free_req_work; |
543af3a1 PB |
2378 | io_req_task_work_add(req); |
2379 | } | |
216578e5 PB |
2380 | } |
2381 | ||
6c503150 | 2382 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2383 | { |
2384 | /* See comment at the top of this file */ | |
2385 | smp_rmb(); | |
e23de15f | 2386 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2387 | } |
2388 | ||
fb5ccc98 PB |
2389 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2390 | { | |
2391 | struct io_rings *rings = ctx->rings; | |
2392 | ||
2393 | /* make sure SQ entry isn't read before tail */ | |
2394 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2395 | } | |
2396 | ||
8ff069bf | 2397 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2398 | { |
8ff069bf | 2399 | unsigned int cflags; |
e94f141b | 2400 | |
bcda7baa JA |
2401 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2402 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2403 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2404 | kfree(kbuf); |
2405 | return cflags; | |
e94f141b JA |
2406 | } |
2407 | ||
8ff069bf | 2408 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2409 | { |
ae421d93 PB |
2410 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
2411 | return 0; | |
30d51dd4 | 2412 | return io_put_kbuf(req, req->kbuf); |
8ff069bf PB |
2413 | } |
2414 | ||
4c6e277c JA |
2415 | static inline bool io_run_task_work(void) |
2416 | { | |
ef98eb04 | 2417 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2418 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2419 | tracehook_notify_signal(); |
4c6e277c JA |
2420 | return true; |
2421 | } | |
2422 | ||
2423 | return false; | |
bcda7baa JA |
2424 | } |
2425 | ||
5ba3c874 | 2426 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 2427 | { |
5eef4e87 | 2428 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 2429 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 2430 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 2431 | int nr_events = 0; |
def596e9 JA |
2432 | |
2433 | /* | |
2434 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 2435 | * off our complete list. |
def596e9 | 2436 | */ |
87a115fb | 2437 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 2438 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2439 | |
5eef4e87 PB |
2440 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
2441 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 2442 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2443 | int ret; |
def596e9 JA |
2444 | |
2445 | /* | |
581f9810 BM |
2446 | * Move completed and retryable entries to our local lists. |
2447 | * If we find a request that requires polling, break out | |
2448 | * and complete those lists first, if we have entries there. | |
def596e9 | 2449 | */ |
e3f721e6 | 2450 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2451 | break; |
2452 | ||
b688f11e | 2453 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
2454 | if (unlikely(ret < 0)) |
2455 | return ret; | |
2456 | else if (ret) | |
ef99b2d3 | 2457 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2458 | |
3aadc23e | 2459 | /* iopoll may have completed current req */ |
b688f11e | 2460 | if (!rq_list_empty(iob.req_list) || |
e3f721e6 PB |
2461 | READ_ONCE(req->iopoll_completed)) |
2462 | break; | |
def596e9 JA |
2463 | } |
2464 | ||
b688f11e JA |
2465 | if (!rq_list_empty(iob.req_list)) |
2466 | iob.complete(&iob); | |
5eef4e87 PB |
2467 | else if (!pos) |
2468 | return 0; | |
2469 | ||
2470 | prev = start; | |
2471 | wq_list_for_each_resume(pos, prev) { | |
2472 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
2473 | ||
b3fa03fd PB |
2474 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
2475 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 2476 | break; |
b3fa03fd | 2477 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
f5ed3bcd | 2478 | io_put_rw_kbuf(req)); |
e3f721e6 PB |
2479 | nr_events++; |
2480 | } | |
def596e9 | 2481 | |
f5ed3bcd PB |
2482 | if (unlikely(!nr_events)) |
2483 | return 0; | |
2484 | ||
2485 | io_commit_cqring(ctx); | |
2486 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 2487 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 2488 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 2489 | io_free_batch_list(ctx, pos); |
5ba3c874 | 2490 | return nr_events; |
def596e9 JA |
2491 | } |
2492 | ||
def596e9 JA |
2493 | /* |
2494 | * We can't just wait for polled events to come to us, we have to actively | |
2495 | * find and complete them. | |
2496 | */ | |
c072481d | 2497 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2498 | { |
2499 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2500 | return; | |
2501 | ||
2502 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 2503 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 2504 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 2505 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 2506 | break; |
08f5439f JA |
2507 | /* |
2508 | * Ensure we allow local-to-the-cpu processing to take place, | |
2509 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2510 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2511 | */ |
3fcee5a6 PB |
2512 | if (need_resched()) { |
2513 | mutex_unlock(&ctx->uring_lock); | |
2514 | cond_resched(); | |
2515 | mutex_lock(&ctx->uring_lock); | |
2516 | } | |
def596e9 JA |
2517 | } |
2518 | mutex_unlock(&ctx->uring_lock); | |
2519 | } | |
2520 | ||
7668b92a | 2521 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2522 | { |
7668b92a | 2523 | unsigned int nr_events = 0; |
e9979b36 | 2524 | int ret = 0; |
500f9fba | 2525 | |
c7849be9 XW |
2526 | /* |
2527 | * We disallow the app entering submit/complete with polling, but we | |
2528 | * still need to lock the ring to prevent racing with polled issue | |
2529 | * that got punted to a workqueue. | |
2530 | */ | |
2531 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2532 | /* |
2533 | * Don't enter poll loop if we already have events pending. | |
2534 | * If we do, we can potentially be spinning for commands that | |
2535 | * already triggered a CQE (eg in error). | |
2536 | */ | |
5ed7a37d | 2537 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2538 | __io_cqring_overflow_flush(ctx, false); |
2539 | if (io_cqring_events(ctx)) | |
2540 | goto out; | |
def596e9 | 2541 | do { |
500f9fba JA |
2542 | /* |
2543 | * If a submit got punted to a workqueue, we can have the | |
2544 | * application entering polling for a command before it gets | |
2545 | * issued. That app will hold the uring_lock for the duration | |
2546 | * of the poll right here, so we need to take a breather every | |
2547 | * now and then to ensure that the issue has a chance to add | |
2548 | * the poll to the issued list. Otherwise we can spin here | |
2549 | * forever, while the workqueue is stuck trying to acquire the | |
2550 | * very same mutex. | |
2551 | */ | |
5eef4e87 | 2552 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2553 | u32 tail = ctx->cached_cq_tail; |
2554 | ||
500f9fba | 2555 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2556 | io_run_task_work(); |
500f9fba | 2557 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2558 | |
8f487ef2 PB |
2559 | /* some requests don't go through iopoll_list */ |
2560 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 2561 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 2562 | break; |
500f9fba | 2563 | } |
5ba3c874 PB |
2564 | ret = io_do_iopoll(ctx, !min); |
2565 | if (ret < 0) | |
2566 | break; | |
2567 | nr_events += ret; | |
2568 | ret = 0; | |
2569 | } while (nr_events < min && !need_resched()); | |
f39c8a5b | 2570 | out: |
500f9fba | 2571 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2572 | return ret; |
2573 | } | |
2574 | ||
491381ce | 2575 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2576 | { |
491381ce JA |
2577 | /* |
2578 | * Tell lockdep we inherited freeze protection from submission | |
2579 | * thread. | |
2580 | */ | |
2581 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2582 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2583 | |
1c98679d PB |
2584 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2585 | sb_end_write(sb); | |
2b188cc1 JA |
2586 | } |
2587 | } | |
2588 | ||
b63534c4 | 2589 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2590 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2591 | { |
ab454438 | 2592 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2593 | |
d886e185 | 2594 | if (!req_has_async_data(req)) |
ab454438 | 2595 | return !io_req_prep_async(req); |
538941e2 | 2596 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 2597 | return true; |
b63534c4 | 2598 | } |
b63534c4 | 2599 | |
3e6a0d3c | 2600 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2601 | { |
355afaeb | 2602 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2603 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2604 | |
355afaeb JA |
2605 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2606 | return false; | |
3e6a0d3c JA |
2607 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2608 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2609 | return false; |
7c977a58 JA |
2610 | /* |
2611 | * If ref is dying, we might be running poll reap from the exit work. | |
2612 | * Don't attempt to reissue from that path, just let it fail with | |
2613 | * -EAGAIN. | |
2614 | */ | |
3e6a0d3c JA |
2615 | if (percpu_ref_is_dying(&ctx->refs)) |
2616 | return false; | |
ef046888 JA |
2617 | /* |
2618 | * Play it safe and assume not safe to re-import and reissue if we're | |
2619 | * not in the original thread group (or in task context). | |
2620 | */ | |
2621 | if (!same_thread_group(req->task, current) || !in_task()) | |
2622 | return false; | |
3e6a0d3c JA |
2623 | return true; |
2624 | } | |
e82ad485 | 2625 | #else |
a1ff1e3f | 2626 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2627 | { |
2628 | return false; | |
2629 | } | |
e82ad485 | 2630 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2631 | { |
b63534c4 JA |
2632 | return false; |
2633 | } | |
3e6a0d3c | 2634 | #endif |
b63534c4 | 2635 | |
8ef12efe | 2636 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2637 | { |
b65c128f PB |
2638 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2639 | kiocb_end_write(req); | |
258f3a7f | 2640 | if (unlikely(res != req->result)) { |
9532b99b PB |
2641 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
2642 | io_rw_should_reissue(req)) { | |
2643 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2644 | return true; |
9532b99b | 2645 | } |
93d2bcd2 | 2646 | req_set_fail(req); |
8ef12efe | 2647 | req->result = res; |
9532b99b | 2648 | } |
8ef12efe JA |
2649 | return false; |
2650 | } | |
2651 | ||
f237c30a | 2652 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2653 | { |
126180b9 | 2654 | unsigned int cflags = io_put_rw_kbuf(req); |
54daa9b2 | 2655 | int res = req->result; |
126180b9 | 2656 | |
fff4e40e | 2657 | if (*locked) { |
126180b9 | 2658 | io_req_complete_state(req, res, cflags); |
fff4e40e PB |
2659 | io_req_add_compl_list(req); |
2660 | } else { | |
126180b9 | 2661 | io_req_complete_post(req, res, cflags); |
fff4e40e | 2662 | } |
8ef12efe JA |
2663 | } |
2664 | ||
2665 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2666 | unsigned int issue_flags) | |
2667 | { | |
2668 | if (__io_complete_rw_common(req, res)) | |
2669 | return; | |
63637853 | 2670 | __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); |
ba816ad6 JA |
2671 | } |
2672 | ||
2673 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2674 | { | |
9adbd45d | 2675 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2676 | |
8ef12efe JA |
2677 | if (__io_complete_rw_common(req, res)) |
2678 | return; | |
2679 | req->result = res; | |
2680 | req->io_task_work.func = io_req_task_complete; | |
2681 | io_req_task_work_add(req); | |
2b188cc1 JA |
2682 | } |
2683 | ||
def596e9 JA |
2684 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2685 | { | |
9adbd45d | 2686 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2687 | |
491381ce JA |
2688 | if (kiocb->ki_flags & IOCB_WRITE) |
2689 | kiocb_end_write(req); | |
9532b99b | 2690 | if (unlikely(res != req->result)) { |
b66ceaf3 PB |
2691 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
2692 | req->flags |= REQ_F_REISSUE; | |
2693 | return; | |
9532b99b | 2694 | } |
258f3a7f | 2695 | req->result = res; |
8c130827 | 2696 | } |
bbde017a | 2697 | |
b3fa03fd PB |
2698 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
2699 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
2700 | } |
2701 | ||
2702 | /* | |
2703 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2704 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2705 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2706 | * accessing the kiocb cookie. |
2707 | */ | |
9882131c | 2708 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
2709 | { |
2710 | struct io_ring_ctx *ctx = req->ctx; | |
9882131c | 2711 | const bool need_lock = !(issue_flags & IO_URING_F_NONBLOCK); |
cb3d8972 PB |
2712 | |
2713 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
9882131c | 2714 | if (unlikely(need_lock)) |
cb3d8972 | 2715 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
2716 | |
2717 | /* | |
2718 | * Track whether we have multiple files in our lists. This will impact | |
2719 | * how we do polling eventually, not spinning if we're on potentially | |
2720 | * different devices. | |
2721 | */ | |
5eef4e87 | 2722 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2723 | ctx->poll_multi_queue = false; |
2724 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
2725 | struct io_kiocb *list_req; |
2726 | ||
5eef4e87 PB |
2727 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
2728 | comp_list); | |
30da1b45 | 2729 | if (list_req->file != req->file) |
915b3dde | 2730 | ctx->poll_multi_queue = true; |
def596e9 JA |
2731 | } |
2732 | ||
2733 | /* | |
2734 | * For fast devices, IO may have already completed. If it has, add | |
2735 | * it to the front so we find it first. | |
2736 | */ | |
65a6543d | 2737 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 2738 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 2739 | else |
5eef4e87 | 2740 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 2741 | |
9882131c | 2742 | if (unlikely(need_lock)) { |
cb3d8972 PB |
2743 | /* |
2744 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2745 | * in sq thread task context or in io worker task context. If | |
2746 | * current task context is sq thread, we don't need to check | |
2747 | * whether should wake up sq thread. | |
2748 | */ | |
2749 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2750 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2751 | wake_up(&ctx->sq_data->wait); | |
2752 | ||
2753 | mutex_unlock(&ctx->uring_lock); | |
2754 | } | |
def596e9 JA |
2755 | } |
2756 | ||
4503b767 JA |
2757 | static bool io_bdev_nowait(struct block_device *bdev) |
2758 | { | |
9ba0d0c8 | 2759 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2760 | } |
2761 | ||
2b188cc1 JA |
2762 | /* |
2763 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2764 | * any file. For now, just ensure that anything potentially problematic is done | |
2765 | * inline. | |
2766 | */ | |
35645ac3 | 2767 | static bool __io_file_supports_nowait(struct file *file) |
2b188cc1 JA |
2768 | { |
2769 | umode_t mode = file_inode(file)->i_mode; | |
2770 | ||
4503b767 | 2771 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2772 | if (IS_ENABLED(CONFIG_BLOCK) && |
2773 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2774 | return true; |
2775 | return false; | |
2776 | } | |
976517f1 | 2777 | if (S_ISSOCK(mode)) |
2b188cc1 | 2778 | return true; |
4503b767 | 2779 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2780 | if (IS_ENABLED(CONFIG_BLOCK) && |
2781 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2782 | file->f_op != &io_uring_fops) |
2783 | return true; | |
2784 | return false; | |
2785 | } | |
2b188cc1 | 2786 | |
c5b85625 JA |
2787 | /* any ->read/write should understand O_NONBLOCK */ |
2788 | if (file->f_flags & O_NONBLOCK) | |
2789 | return true; | |
35645ac3 | 2790 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 JA |
2791 | } |
2792 | ||
35645ac3 | 2793 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 2794 | { |
35645ac3 | 2795 | if (likely(req->flags & REQ_F_SUPPORT_NOWAIT)) |
7b29f92d | 2796 | return true; |
35645ac3 | 2797 | return __io_file_supports_nowait(req->file); |
7b29f92d JA |
2798 | } |
2799 | ||
5d329e12 JA |
2800 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2801 | int rw) | |
2b188cc1 | 2802 | { |
def596e9 | 2803 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2804 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2805 | struct file *file = req->file; |
09bb8394 JA |
2806 | unsigned ioprio; |
2807 | int ret; | |
2b188cc1 | 2808 | |
c97d8a0f | 2809 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2810 | req->flags |= REQ_F_ISREG; |
2811 | ||
2b188cc1 | 2812 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2813 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2814 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2815 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2816 | } |
5cb03d63 PB |
2817 | kiocb->ki_hint = ki_hint_validate(file_write_hint(file)); |
2818 | kiocb->ki_flags = iocb_flags(file); | |
3e577dcd PB |
2819 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); |
2820 | if (unlikely(ret)) | |
2821 | return ret; | |
2b188cc1 | 2822 | |
5d329e12 JA |
2823 | /* |
2824 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
2825 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
2826 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
2827 | */ | |
2828 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
35645ac3 | 2829 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) |
75c668cd PB |
2830 | req->flags |= REQ_F_NOWAIT; |
2831 | ||
2b188cc1 JA |
2832 | ioprio = READ_ONCE(sqe->ioprio); |
2833 | if (ioprio) { | |
2834 | ret = ioprio_check_cap(ioprio); | |
2835 | if (ret) | |
09bb8394 | 2836 | return ret; |
2b188cc1 JA |
2837 | |
2838 | kiocb->ki_ioprio = ioprio; | |
2839 | } else | |
2840 | kiocb->ki_ioprio = get_current_ioprio(); | |
2841 | ||
def596e9 | 2842 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
5cb03d63 | 2843 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) |
09bb8394 | 2844 | return -EOPNOTSUPP; |
2b188cc1 | 2845 | |
394918eb | 2846 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
def596e9 | 2847 | kiocb->ki_complete = io_complete_rw_iopoll; |
65a6543d | 2848 | req->iopoll_completed = 0; |
def596e9 | 2849 | } else { |
09bb8394 JA |
2850 | if (kiocb->ki_flags & IOCB_HIPRI) |
2851 | return -EINVAL; | |
def596e9 JA |
2852 | kiocb->ki_complete = io_complete_rw; |
2853 | } | |
9adbd45d | 2854 | |
578c0ee2 | 2855 | req->imu = NULL; |
3529d8c2 JA |
2856 | req->rw.addr = READ_ONCE(sqe->addr); |
2857 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2858 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2859 | return 0; |
2b188cc1 JA |
2860 | } |
2861 | ||
2862 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2863 | { | |
2864 | switch (ret) { | |
2865 | case -EIOCBQUEUED: | |
2866 | break; | |
2867 | case -ERESTARTSYS: | |
2868 | case -ERESTARTNOINTR: | |
2869 | case -ERESTARTNOHAND: | |
2870 | case -ERESTART_RESTARTBLOCK: | |
2871 | /* | |
2872 | * We can't just restart the syscall, since previously | |
2873 | * submitted sqes may already be in progress. Just fail this | |
2874 | * IO with EINTR. | |
2875 | */ | |
2876 | ret = -EINTR; | |
df561f66 | 2877 | fallthrough; |
2b188cc1 JA |
2878 | default: |
2879 | kiocb->ki_complete(kiocb, ret, 0); | |
2880 | } | |
2881 | } | |
2882 | ||
a1d7c393 | 2883 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2884 | unsigned int issue_flags) |
ba816ad6 | 2885 | { |
ba04291e | 2886 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2887 | struct io_async_rw *io = req->async_data; |
ba04291e | 2888 | |
227c0c96 | 2889 | /* add previously done IO, if any */ |
d886e185 | 2890 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 2891 | if (ret < 0) |
e8c2bc1f | 2892 | ret = io->bytes_done; |
227c0c96 | 2893 | else |
e8c2bc1f | 2894 | ret += io->bytes_done; |
227c0c96 JA |
2895 | } |
2896 | ||
ba04291e JA |
2897 | if (req->flags & REQ_F_CUR_POS) |
2898 | req->file->f_pos = kiocb->ki_pos; | |
b66ceaf3 | 2899 | if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) |
889fca73 | 2900 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2901 | else |
2902 | io_rw_done(kiocb, ret); | |
97284637 | 2903 | |
b66ceaf3 | 2904 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 2905 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2906 | if (io_resubmit_prep(req)) { |
773af691 | 2907 | io_req_task_queue_reissue(req); |
8c130827 | 2908 | } else { |
b66ceaf3 PB |
2909 | unsigned int cflags = io_put_rw_kbuf(req); |
2910 | struct io_ring_ctx *ctx = req->ctx; | |
2911 | ||
93d2bcd2 | 2912 | req_set_fail(req); |
14cfbb7a | 2913 | if (!(issue_flags & IO_URING_F_NONBLOCK)) { |
b66ceaf3 PB |
2914 | mutex_lock(&ctx->uring_lock); |
2915 | __io_req_complete(req, issue_flags, ret, cflags); | |
2916 | mutex_unlock(&ctx->uring_lock); | |
2917 | } else { | |
2918 | __io_req_complete(req, issue_flags, ret, cflags); | |
2919 | } | |
97284637 PB |
2920 | } |
2921 | } | |
ba816ad6 JA |
2922 | } |
2923 | ||
eae071c9 PB |
2924 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2925 | struct io_mapped_ubuf *imu) | |
edafccee | 2926 | { |
9adbd45d | 2927 | size_t len = req->rw.len; |
75769e3f | 2928 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2929 | size_t offset; |
edafccee | 2930 | |
75769e3f | 2931 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2932 | return -EFAULT; |
2933 | /* not inside the mapped region */ | |
4751f53d | 2934 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2935 | return -EFAULT; |
2936 | ||
2937 | /* | |
2938 | * May not be a start of buffer, set size appropriately | |
2939 | * and advance us to the beginning. | |
2940 | */ | |
2941 | offset = buf_addr - imu->ubuf; | |
2942 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2943 | |
2944 | if (offset) { | |
2945 | /* | |
2946 | * Don't use iov_iter_advance() here, as it's really slow for | |
2947 | * using the latter parts of a big fixed buffer - it iterates | |
2948 | * over each segment manually. We can cheat a bit here, because | |
2949 | * we know that: | |
2950 | * | |
2951 | * 1) it's a BVEC iter, we set it up | |
2952 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2953 | * first and last bvec | |
2954 | * | |
2955 | * So just find our index, and adjust the iterator afterwards. | |
2956 | * If the offset is within the first bvec (or the whole first | |
2957 | * bvec, just use iov_iter_advance(). This makes it easier | |
2958 | * since we can just skip the first segment, which may not | |
2959 | * be PAGE_SIZE aligned. | |
2960 | */ | |
2961 | const struct bio_vec *bvec = imu->bvec; | |
2962 | ||
2963 | if (offset <= bvec->bv_len) { | |
2964 | iov_iter_advance(iter, offset); | |
2965 | } else { | |
2966 | unsigned long seg_skip; | |
2967 | ||
2968 | /* skip first vec */ | |
2969 | offset -= bvec->bv_len; | |
2970 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2971 | ||
2972 | iter->bvec = bvec + seg_skip; | |
2973 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2974 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2975 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2976 | } |
2977 | } | |
2978 | ||
847595de | 2979 | return 0; |
edafccee JA |
2980 | } |
2981 | ||
eae071c9 PB |
2982 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
2983 | { | |
eae071c9 PB |
2984 | struct io_mapped_ubuf *imu = req->imu; |
2985 | u16 index, buf_index = req->buf_index; | |
2986 | ||
2987 | if (likely(!imu)) { | |
578c0ee2 PB |
2988 | struct io_ring_ctx *ctx = req->ctx; |
2989 | ||
eae071c9 PB |
2990 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2991 | return -EFAULT; | |
578c0ee2 | 2992 | io_req_set_rsrc_node(req, ctx); |
eae071c9 PB |
2993 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2994 | imu = READ_ONCE(ctx->user_bufs[index]); | |
2995 | req->imu = imu; | |
2996 | } | |
2997 | return __io_import_fixed(req, rw, iter, imu); | |
2998 | } | |
2999 | ||
bcda7baa JA |
3000 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3001 | { | |
3002 | if (needs_lock) | |
3003 | mutex_unlock(&ctx->uring_lock); | |
3004 | } | |
3005 | ||
3006 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3007 | { | |
3008 | /* | |
3009 | * "Normal" inline submissions always hold the uring_lock, since we | |
3010 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3011 | * The only exception is when we've detached the request and issue it | |
3012 | * from an async worker thread, grab the lock for that case. | |
3013 | */ | |
3014 | if (needs_lock) | |
3015 | mutex_lock(&ctx->uring_lock); | |
3016 | } | |
3017 | ||
3018 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
51aac424 | 3019 | int bgid, unsigned int issue_flags) |
bcda7baa | 3020 | { |
30d51dd4 | 3021 | struct io_buffer *kbuf = req->kbuf; |
bcda7baa | 3022 | struct io_buffer *head; |
51aac424 | 3023 | bool needs_lock = !(issue_flags & IO_URING_F_NONBLOCK); |
bcda7baa JA |
3024 | |
3025 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3026 | return kbuf; | |
3027 | ||
3028 | io_ring_submit_lock(req->ctx, needs_lock); | |
3029 | ||
3030 | lockdep_assert_held(&req->ctx->uring_lock); | |
3031 | ||
9e15c3a0 | 3032 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3033 | if (head) { |
3034 | if (!list_empty(&head->list)) { | |
3035 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3036 | list); | |
3037 | list_del(&kbuf->list); | |
3038 | } else { | |
3039 | kbuf = head; | |
9e15c3a0 | 3040 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3041 | } |
3042 | if (*len > kbuf->len) | |
3043 | *len = kbuf->len; | |
30d51dd4 PB |
3044 | req->flags |= REQ_F_BUFFER_SELECTED; |
3045 | req->kbuf = kbuf; | |
bcda7baa JA |
3046 | } else { |
3047 | kbuf = ERR_PTR(-ENOBUFS); | |
3048 | } | |
3049 | ||
3050 | io_ring_submit_unlock(req->ctx, needs_lock); | |
bcda7baa JA |
3051 | return kbuf; |
3052 | } | |
3053 | ||
4d954c25 | 3054 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3055 | unsigned int issue_flags) |
4d954c25 JA |
3056 | { |
3057 | struct io_buffer *kbuf; | |
4f4eeba8 | 3058 | u16 bgid; |
4d954c25 | 3059 | |
4f4eeba8 | 3060 | bgid = req->buf_index; |
51aac424 | 3061 | kbuf = io_buffer_select(req, len, bgid, issue_flags); |
4d954c25 JA |
3062 | if (IS_ERR(kbuf)) |
3063 | return kbuf; | |
4d954c25 JA |
3064 | return u64_to_user_ptr(kbuf->addr); |
3065 | } | |
3066 | ||
3067 | #ifdef CONFIG_COMPAT | |
3068 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3069 | unsigned int issue_flags) |
4d954c25 JA |
3070 | { |
3071 | struct compat_iovec __user *uiov; | |
3072 | compat_ssize_t clen; | |
3073 | void __user *buf; | |
3074 | ssize_t len; | |
3075 | ||
3076 | uiov = u64_to_user_ptr(req->rw.addr); | |
3077 | if (!access_ok(uiov, sizeof(*uiov))) | |
3078 | return -EFAULT; | |
3079 | if (__get_user(clen, &uiov->iov_len)) | |
3080 | return -EFAULT; | |
3081 | if (clen < 0) | |
3082 | return -EINVAL; | |
3083 | ||
3084 | len = clen; | |
51aac424 | 3085 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3086 | if (IS_ERR(buf)) |
3087 | return PTR_ERR(buf); | |
3088 | iov[0].iov_base = buf; | |
3089 | iov[0].iov_len = (compat_size_t) len; | |
3090 | return 0; | |
3091 | } | |
3092 | #endif | |
3093 | ||
3094 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3095 | unsigned int issue_flags) |
4d954c25 JA |
3096 | { |
3097 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3098 | void __user *buf; | |
3099 | ssize_t len; | |
3100 | ||
3101 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3102 | return -EFAULT; | |
3103 | ||
3104 | len = iov[0].iov_len; | |
3105 | if (len < 0) | |
3106 | return -EINVAL; | |
51aac424 | 3107 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3108 | if (IS_ERR(buf)) |
3109 | return PTR_ERR(buf); | |
3110 | iov[0].iov_base = buf; | |
3111 | iov[0].iov_len = len; | |
3112 | return 0; | |
3113 | } | |
3114 | ||
3115 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3116 | unsigned int issue_flags) |
4d954c25 | 3117 | { |
dddb3e26 | 3118 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 | 3119 | struct io_buffer *kbuf = req->kbuf; |
dddb3e26 | 3120 | |
dddb3e26 JA |
3121 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
3122 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3123 | return 0; |
dddb3e26 | 3124 | } |
dd201662 | 3125 | if (req->rw.len != 1) |
4d954c25 JA |
3126 | return -EINVAL; |
3127 | ||
3128 | #ifdef CONFIG_COMPAT | |
3129 | if (req->ctx->compat) | |
51aac424 | 3130 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
3131 | #endif |
3132 | ||
51aac424 | 3133 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
3134 | } |
3135 | ||
caa8fe6e PB |
3136 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
3137 | struct io_rw_state *s, | |
3138 | unsigned int issue_flags) | |
2b188cc1 | 3139 | { |
5e49c973 | 3140 | struct iov_iter *iter = &s->iter; |
847595de | 3141 | u8 opcode = req->opcode; |
caa8fe6e | 3142 | struct iovec *iovec; |
d1d681b0 PB |
3143 | void __user *buf; |
3144 | size_t sqe_len; | |
4d954c25 | 3145 | ssize_t ret; |
edafccee | 3146 | |
caa8fe6e PB |
3147 | BUILD_BUG_ON(ERR_PTR(0) != NULL); |
3148 | ||
3149 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) | |
3150 | return ERR_PTR(io_import_fixed(req, rw, iter)); | |
2b188cc1 | 3151 | |
bcda7baa | 3152 | /* buffer index only valid with fixed read/write, or buffer select */ |
d1d681b0 | 3153 | if (unlikely(req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))) |
caa8fe6e | 3154 | return ERR_PTR(-EINVAL); |
9adbd45d | 3155 | |
d1d681b0 PB |
3156 | buf = u64_to_user_ptr(req->rw.addr); |
3157 | sqe_len = req->rw.len; | |
3158 | ||
3a6820f2 | 3159 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3160 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 3161 | buf = io_rw_buffer_select(req, &sqe_len, issue_flags); |
867a23ea | 3162 | if (IS_ERR(buf)) |
caa8fe6e | 3163 | return ERR_PTR(PTR_ERR(buf)); |
3f9d6441 | 3164 | req->rw.len = sqe_len; |
bcda7baa JA |
3165 | } |
3166 | ||
5e49c973 | 3167 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
caa8fe6e | 3168 | return ERR_PTR(ret); |
3a6820f2 JA |
3169 | } |
3170 | ||
caa8fe6e | 3171 | iovec = s->fast_iov; |
4d954c25 | 3172 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 3173 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
847595de | 3174 | if (!ret) |
caa8fe6e PB |
3175 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); |
3176 | return ERR_PTR(ret); | |
4d954c25 JA |
3177 | } |
3178 | ||
caa8fe6e | 3179 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 3180 | req->ctx->compat); |
caa8fe6e PB |
3181 | if (unlikely(ret < 0)) |
3182 | return ERR_PTR(ret); | |
3183 | return iovec; | |
2b188cc1 JA |
3184 | } |
3185 | ||
5e49c973 PB |
3186 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
3187 | struct iovec **iovec, struct io_rw_state *s, | |
3188 | unsigned int issue_flags) | |
3189 | { | |
caa8fe6e PB |
3190 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
3191 | if (unlikely(IS_ERR(*iovec))) | |
3192 | return PTR_ERR(*iovec); | |
5e49c973 | 3193 | |
5e49c973 | 3194 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 3195 | return 0; |
5e49c973 PB |
3196 | } |
3197 | ||
0fef9483 JA |
3198 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3199 | { | |
5b09e37e | 3200 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3201 | } |
3202 | ||
31b51510 | 3203 | /* |
32960613 JA |
3204 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3205 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3206 | */ |
4017eb91 | 3207 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3208 | { |
4017eb91 JA |
3209 | struct kiocb *kiocb = &req->rw.kiocb; |
3210 | struct file *file = req->file; | |
32960613 JA |
3211 | ssize_t ret = 0; |
3212 | ||
3213 | /* | |
3214 | * Don't support polled IO through this interface, and we can't | |
3215 | * support non-blocking either. For the latter, this just causes | |
3216 | * the kiocb to be handled from an async context. | |
3217 | */ | |
3218 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3219 | return -EOPNOTSUPP; | |
35645ac3 PB |
3220 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
3221 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
3222 | return -EAGAIN; |
3223 | ||
3224 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3225 | struct iovec iovec; |
32960613 JA |
3226 | ssize_t nr; |
3227 | ||
311ae9e1 PB |
3228 | if (!iov_iter_is_bvec(iter)) { |
3229 | iovec = iov_iter_iovec(iter); | |
3230 | } else { | |
4017eb91 JA |
3231 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3232 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3233 | } |
3234 | ||
32960613 JA |
3235 | if (rw == READ) { |
3236 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3237 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3238 | } else { |
3239 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3240 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3241 | } |
3242 | ||
3243 | if (nr < 0) { | |
3244 | if (!ret) | |
3245 | ret = nr; | |
3246 | break; | |
3247 | } | |
16c8d2df JA |
3248 | if (!iov_iter_is_bvec(iter)) { |
3249 | iov_iter_advance(iter, nr); | |
3250 | } else { | |
3251 | req->rw.len -= nr; | |
3252 | req->rw.addr += nr; | |
3253 | } | |
32960613 JA |
3254 | ret += nr; |
3255 | if (nr != iovec.iov_len) | |
3256 | break; | |
32960613 JA |
3257 | } |
3258 | ||
3259 | return ret; | |
3260 | } | |
3261 | ||
ff6165b2 JA |
3262 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3263 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3264 | { |
e8c2bc1f | 3265 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3266 | |
538941e2 | 3267 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 3268 | rw->free_iovec = iovec; |
227c0c96 | 3269 | rw->bytes_done = 0; |
ff6165b2 | 3270 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3271 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3272 | return; |
b64e3444 | 3273 | if (!iovec) { |
ff6165b2 JA |
3274 | unsigned iov_off = 0; |
3275 | ||
538941e2 | 3276 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
3277 | if (iter->iov != fast_iov) { |
3278 | iov_off = iter->iov - fast_iov; | |
538941e2 | 3279 | rw->s.iter.iov += iov_off; |
ff6165b2 | 3280 | } |
538941e2 PB |
3281 | if (rw->s.fast_iov != fast_iov) |
3282 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3283 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3284 | } else { |
3285 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3286 | } |
3287 | } | |
3288 | ||
8d4af685 | 3289 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3290 | { |
e8c2bc1f JA |
3291 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3292 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
3293 | if (req->async_data) { |
3294 | req->flags |= REQ_F_ASYNC_DATA; | |
3295 | return false; | |
3296 | } | |
3297 | return true; | |
3d9932a8 XW |
3298 | } |
3299 | ||
ff6165b2 | 3300 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 3301 | struct io_rw_state *s, bool force) |
b7bb4f7d | 3302 | { |
26f0505a | 3303 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3304 | return 0; |
d886e185 | 3305 | if (!req_has_async_data(req)) { |
cd658695 JA |
3306 | struct io_async_rw *iorw; |
3307 | ||
6cb78689 | 3308 | if (io_alloc_async_data(req)) { |
6bf985dc | 3309 | kfree(iovec); |
5d204bcf | 3310 | return -ENOMEM; |
6bf985dc | 3311 | } |
b7bb4f7d | 3312 | |
c88598a9 | 3313 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
3314 | iorw = req->async_data; |
3315 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 3316 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 3317 | } |
b7bb4f7d | 3318 | return 0; |
f67676d1 JA |
3319 | } |
3320 | ||
73debe68 | 3321 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3322 | { |
e8c2bc1f | 3323 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 3324 | struct iovec *iov; |
847595de | 3325 | int ret; |
c3e330a4 | 3326 | |
51aac424 | 3327 | /* submission path, ->uring_lock should already be taken */ |
5e49c973 | 3328 | ret = io_import_iovec(rw, req, &iov, &iorw->s, IO_URING_F_NONBLOCK); |
c3e330a4 PB |
3329 | if (unlikely(ret < 0)) |
3330 | return ret; | |
3331 | ||
ab0b196c PB |
3332 | iorw->bytes_done = 0; |
3333 | iorw->free_iovec = iov; | |
3334 | if (iov) | |
3335 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3336 | return 0; |
3337 | } | |
3338 | ||
73debe68 | 3339 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3340 | { |
3529d8c2 JA |
3341 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3342 | return -EBADF; | |
5d329e12 | 3343 | return io_prep_rw(req, sqe, READ); |
f67676d1 JA |
3344 | } |
3345 | ||
c1dd91d1 JA |
3346 | /* |
3347 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3348 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3349 | * This gets called when the page is unlocked, and we generally expect that to | |
3350 | * happen when the page IO is completed and the page is now uptodate. This will | |
3351 | * queue a task_work based retry of the operation, attempting to copy the data | |
3352 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3353 | * do a thread based blocking retry of the operation. That's the unexpected | |
3354 | * slow path. | |
3355 | */ | |
bcf5a063 JA |
3356 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3357 | int sync, void *arg) | |
3358 | { | |
3359 | struct wait_page_queue *wpq; | |
3360 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3361 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3362 | |
3363 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3364 | ||
cdc8fcb4 LT |
3365 | if (!wake_page_match(wpq, key)) |
3366 | return 0; | |
3367 | ||
c8d317aa | 3368 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3369 | list_del_init(&wait->entry); |
921b9054 | 3370 | io_req_task_queue(req); |
bcf5a063 JA |
3371 | return 1; |
3372 | } | |
3373 | ||
c1dd91d1 JA |
3374 | /* |
3375 | * This controls whether a given IO request should be armed for async page | |
3376 | * based retry. If we return false here, the request is handed to the async | |
3377 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3378 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3379 | * will either succeed because the page is now uptodate and unlocked, or it | |
3380 | * will register a callback when the page is unlocked at IO completion. Through | |
3381 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3382 | * That retry will attempt the buffered read again. The retry will generally | |
3383 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3384 | * async worker threads for a blocking retry. | |
3385 | */ | |
227c0c96 | 3386 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3387 | { |
e8c2bc1f JA |
3388 | struct io_async_rw *rw = req->async_data; |
3389 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3390 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3391 | |
bcf5a063 JA |
3392 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3393 | if (req->flags & REQ_F_NOWAIT) | |
3394 | return false; | |
f67676d1 | 3395 | |
227c0c96 | 3396 | /* Only for buffered IO */ |
3b2a4439 | 3397 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3398 | return false; |
3b2a4439 | 3399 | |
bcf5a063 JA |
3400 | /* |
3401 | * just use poll if we can, and don't attempt if the fs doesn't | |
3402 | * support callback based unlocks | |
3403 | */ | |
3404 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3405 | return false; | |
f67676d1 | 3406 | |
3b2a4439 JA |
3407 | wait->wait.func = io_async_buf_func; |
3408 | wait->wait.private = req; | |
3409 | wait->wait.flags = 0; | |
3410 | INIT_LIST_HEAD(&wait->wait.entry); | |
3411 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3412 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3413 | kiocb->ki_waitq = wait; |
3b2a4439 | 3414 | return true; |
bcf5a063 JA |
3415 | } |
3416 | ||
aeab9506 | 3417 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 3418 | { |
607b6fb8 | 3419 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 3420 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 3421 | else if (req->file->f_op->read) |
4017eb91 | 3422 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3423 | else |
3424 | return -EINVAL; | |
f67676d1 JA |
3425 | } |
3426 | ||
7db30437 ML |
3427 | static bool need_read_all(struct io_kiocb *req) |
3428 | { | |
3429 | return req->flags & REQ_F_ISREG || | |
3430 | S_ISBLK(file_inode(req->file)->i_mode); | |
3431 | } | |
3432 | ||
889fca73 | 3433 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3434 | { |
607b6fb8 | 3435 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3436 | struct iovec *iovec; |
9adbd45d | 3437 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3438 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 3439 | struct io_async_rw *rw; |
cd658695 | 3440 | ssize_t ret, ret2; |
ff6165b2 | 3441 | |
607b6fb8 PB |
3442 | if (!req_has_async_data(req)) { |
3443 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3444 | if (unlikely(ret < 0)) | |
3445 | return ret; | |
3446 | } else { | |
d886e185 | 3447 | rw = req->async_data; |
c88598a9 | 3448 | s = &rw->s; |
cd658695 JA |
3449 | /* |
3450 | * We come here from an earlier attempt, restore our state to | |
3451 | * match in case it doesn't. It's cheap enough that we don't | |
3452 | * need to make this conditional. | |
3453 | */ | |
c88598a9 | 3454 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 3455 | iovec = NULL; |
2846c481 | 3456 | } |
c88598a9 | 3457 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3458 | |
607b6fb8 PB |
3459 | if (force_nonblock) { |
3460 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3461 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
3462 | ret = io_setup_async_rw(req, iovec, s, true); |
3463 | return ret ?: -EAGAIN; | |
3464 | } | |
a88fc400 | 3465 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
3466 | } else { |
3467 | /* Ensure we clear previously set non-block flag */ | |
3468 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 3469 | } |
9e645e11 | 3470 | |
cd658695 | 3471 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); |
5ea5dd45 PB |
3472 | if (unlikely(ret)) { |
3473 | kfree(iovec); | |
3474 | return ret; | |
3475 | } | |
2b188cc1 | 3476 | |
c88598a9 | 3477 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 3478 | |
230d50d4 | 3479 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3480 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3481 | /* IOPOLL retry should happen for io-wq threads */ |
3482 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3483 | goto done; |
75c668cd PB |
3484 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3485 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3486 | goto done; |
f38c7e3a | 3487 | ret = 0; |
230d50d4 JA |
3488 | } else if (ret == -EIOCBQUEUED) { |
3489 | goto out_free; | |
f80a50a6 | 3490 | } else if (ret == req->result || ret <= 0 || !force_nonblock || |
7db30437 | 3491 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3492 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3493 | goto done; |
227c0c96 JA |
3494 | } |
3495 | ||
cd658695 JA |
3496 | /* |
3497 | * Don't depend on the iter state matching what was consumed, or being | |
3498 | * untouched in case of error. Restore it and we'll advance it | |
3499 | * manually if we need to. | |
3500 | */ | |
c88598a9 | 3501 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3502 | |
c88598a9 | 3503 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
3504 | if (ret2) |
3505 | return ret2; | |
3506 | ||
fe1cdd55 | 3507 | iovec = NULL; |
e8c2bc1f | 3508 | rw = req->async_data; |
c88598a9 | 3509 | s = &rw->s; |
cd658695 JA |
3510 | /* |
3511 | * Now use our persistent iterator and state, if we aren't already. | |
3512 | * We've restored and mapped the iter to match. | |
3513 | */ | |
227c0c96 | 3514 | |
b23df91b | 3515 | do { |
cd658695 JA |
3516 | /* |
3517 | * We end up here because of a partial read, either from | |
3518 | * above or inside this loop. Advance the iter by the bytes | |
3519 | * that were consumed. | |
3520 | */ | |
c88598a9 PB |
3521 | iov_iter_advance(&s->iter, ret); |
3522 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 3523 | break; |
b23df91b | 3524 | rw->bytes_done += ret; |
c88598a9 | 3525 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 3526 | |
b23df91b PB |
3527 | /* if we can retry, do so with the callbacks armed */ |
3528 | if (!io_rw_should_retry(req)) { | |
3529 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3530 | return -EAGAIN; | |
3531 | } | |
3532 | ||
3533 | /* | |
3534 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3535 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3536 | * desired page gets unlocked. We can also get a partial read | |
3537 | * here, and if we do, then just retry at the new offset. | |
3538 | */ | |
c88598a9 | 3539 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
3540 | if (ret == -EIOCBQUEUED) |
3541 | return 0; | |
227c0c96 | 3542 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3543 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 3544 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3545 | } while (ret > 0); |
227c0c96 | 3546 | done: |
889fca73 | 3547 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3548 | out_free: |
3549 | /* it's faster to check here then delegate to kfree */ | |
3550 | if (iovec) | |
3551 | kfree(iovec); | |
5ea5dd45 | 3552 | return 0; |
2b188cc1 JA |
3553 | } |
3554 | ||
73debe68 | 3555 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3556 | { |
3529d8c2 JA |
3557 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3558 | return -EBADF; | |
5d329e12 | 3559 | return io_prep_rw(req, sqe, WRITE); |
f67676d1 JA |
3560 | } |
3561 | ||
889fca73 | 3562 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3563 | { |
607b6fb8 | 3564 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3565 | struct iovec *iovec; |
9adbd45d | 3566 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3567 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3568 | ssize_t ret, ret2; |
2b188cc1 | 3569 | |
607b6fb8 | 3570 | if (!req_has_async_data(req)) { |
5e49c973 PB |
3571 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
3572 | if (unlikely(ret < 0)) | |
2846c481 | 3573 | return ret; |
607b6fb8 PB |
3574 | } else { |
3575 | struct io_async_rw *rw = req->async_data; | |
3576 | ||
3577 | s = &rw->s; | |
3578 | iov_iter_restore(&s->iter, &s->iter_state); | |
3579 | iovec = NULL; | |
2846c481 | 3580 | } |
c88598a9 | 3581 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3582 | |
607b6fb8 PB |
3583 | if (force_nonblock) { |
3584 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3585 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 3586 | goto copy_iov; |
fd6c2e4c | 3587 | |
607b6fb8 PB |
3588 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3589 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3590 | (req->flags & REQ_F_ISREG)) | |
3591 | goto copy_iov; | |
31b51510 | 3592 | |
607b6fb8 PB |
3593 | kiocb->ki_flags |= IOCB_NOWAIT; |
3594 | } else { | |
3595 | /* Ensure we clear previously set non-block flag */ | |
3596 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
3597 | } | |
31b51510 | 3598 | |
cd658695 | 3599 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); |
fa15bafb PB |
3600 | if (unlikely(ret)) |
3601 | goto out_free; | |
4ed734b0 | 3602 | |
fa15bafb PB |
3603 | /* |
3604 | * Open-code file_start_write here to grab freeze protection, | |
3605 | * which will be released by another thread in | |
3606 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3607 | * released so that it doesn't complain about the held lock when | |
3608 | * we return to userspace. | |
3609 | */ | |
3610 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3611 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3612 | __sb_writers_release(file_inode(req->file)->i_sb, |
3613 | SB_FREEZE_WRITE); | |
3614 | } | |
3615 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3616 | |
35645ac3 | 3617 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 3618 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 3619 | else if (req->file->f_op->write) |
c88598a9 | 3620 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
3621 | else |
3622 | ret2 = -EINVAL; | |
4ed734b0 | 3623 | |
6ad7f233 PB |
3624 | if (req->flags & REQ_F_REISSUE) { |
3625 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3626 | ret2 = -EAGAIN; |
6ad7f233 | 3627 | } |
230d50d4 | 3628 | |
fa15bafb PB |
3629 | /* |
3630 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3631 | * retry them without IOCB_NOWAIT. | |
3632 | */ | |
3633 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3634 | ret2 = -EAGAIN; | |
75c668cd PB |
3635 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3636 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3637 | goto done; |
fa15bafb | 3638 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 3639 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 3640 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 3641 | goto copy_iov; |
355afaeb | 3642 | done: |
889fca73 | 3643 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3644 | } else { |
f67676d1 | 3645 | copy_iov: |
c88598a9 PB |
3646 | iov_iter_restore(&s->iter, &s->iter_state); |
3647 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 3648 | return ret ?: -EAGAIN; |
2b188cc1 | 3649 | } |
31b51510 | 3650 | out_free: |
f261c168 | 3651 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3652 | if (iovec) |
6f2cc166 | 3653 | kfree(iovec); |
2b188cc1 JA |
3654 | return ret; |
3655 | } | |
3656 | ||
80a261fd JA |
3657 | static int io_renameat_prep(struct io_kiocb *req, |
3658 | const struct io_uring_sqe *sqe) | |
3659 | { | |
3660 | struct io_rename *ren = &req->rename; | |
3661 | const char __user *oldf, *newf; | |
3662 | ||
ed7eb259 JA |
3663 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3664 | return -EINVAL; | |
26578cda | 3665 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3666 | return -EINVAL; |
80a261fd JA |
3667 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3668 | return -EBADF; | |
3669 | ||
3670 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3671 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3672 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3673 | ren->new_dfd = READ_ONCE(sqe->len); | |
3674 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3675 | ||
3676 | ren->oldpath = getname(oldf); | |
3677 | if (IS_ERR(ren->oldpath)) | |
3678 | return PTR_ERR(ren->oldpath); | |
3679 | ||
3680 | ren->newpath = getname(newf); | |
3681 | if (IS_ERR(ren->newpath)) { | |
3682 | putname(ren->oldpath); | |
3683 | return PTR_ERR(ren->newpath); | |
3684 | } | |
3685 | ||
3686 | req->flags |= REQ_F_NEED_CLEANUP; | |
3687 | return 0; | |
3688 | } | |
3689 | ||
45d189c6 | 3690 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3691 | { |
3692 | struct io_rename *ren = &req->rename; | |
3693 | int ret; | |
3694 | ||
45d189c6 | 3695 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3696 | return -EAGAIN; |
3697 | ||
3698 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3699 | ren->newpath, ren->flags); | |
3700 | ||
3701 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3702 | if (ret < 0) | |
93d2bcd2 | 3703 | req_set_fail(req); |
80a261fd JA |
3704 | io_req_complete(req, ret); |
3705 | return 0; | |
3706 | } | |
3707 | ||
14a1143b JA |
3708 | static int io_unlinkat_prep(struct io_kiocb *req, |
3709 | const struct io_uring_sqe *sqe) | |
3710 | { | |
3711 | struct io_unlink *un = &req->unlink; | |
3712 | const char __user *fname; | |
3713 | ||
22634bc5 JA |
3714 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3715 | return -EINVAL; | |
26578cda PB |
3716 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3717 | sqe->splice_fd_in) | |
22634bc5 | 3718 | return -EINVAL; |
14a1143b JA |
3719 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3720 | return -EBADF; | |
3721 | ||
3722 | un->dfd = READ_ONCE(sqe->fd); | |
3723 | ||
3724 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3725 | if (un->flags & ~AT_REMOVEDIR) | |
3726 | return -EINVAL; | |
3727 | ||
3728 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3729 | un->filename = getname(fname); | |
3730 | if (IS_ERR(un->filename)) | |
3731 | return PTR_ERR(un->filename); | |
3732 | ||
3733 | req->flags |= REQ_F_NEED_CLEANUP; | |
3734 | return 0; | |
3735 | } | |
3736 | ||
45d189c6 | 3737 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3738 | { |
3739 | struct io_unlink *un = &req->unlink; | |
3740 | int ret; | |
3741 | ||
45d189c6 | 3742 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3743 | return -EAGAIN; |
3744 | ||
3745 | if (un->flags & AT_REMOVEDIR) | |
3746 | ret = do_rmdir(un->dfd, un->filename); | |
3747 | else | |
3748 | ret = do_unlinkat(un->dfd, un->filename); | |
3749 | ||
3750 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3751 | if (ret < 0) | |
93d2bcd2 | 3752 | req_set_fail(req); |
14a1143b JA |
3753 | io_req_complete(req, ret); |
3754 | return 0; | |
3755 | } | |
3756 | ||
e34a02dc DK |
3757 | static int io_mkdirat_prep(struct io_kiocb *req, |
3758 | const struct io_uring_sqe *sqe) | |
3759 | { | |
3760 | struct io_mkdir *mkd = &req->mkdir; | |
3761 | const char __user *fname; | |
3762 | ||
3763 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3764 | return -EINVAL; | |
3765 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
3766 | sqe->splice_fd_in) | |
3767 | return -EINVAL; | |
3768 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3769 | return -EBADF; | |
3770 | ||
3771 | mkd->dfd = READ_ONCE(sqe->fd); | |
3772 | mkd->mode = READ_ONCE(sqe->len); | |
3773 | ||
3774 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3775 | mkd->filename = getname(fname); | |
3776 | if (IS_ERR(mkd->filename)) | |
3777 | return PTR_ERR(mkd->filename); | |
3778 | ||
3779 | req->flags |= REQ_F_NEED_CLEANUP; | |
3780 | return 0; | |
3781 | } | |
3782 | ||
04f34081 | 3783 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
3784 | { |
3785 | struct io_mkdir *mkd = &req->mkdir; | |
3786 | int ret; | |
3787 | ||
3788 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3789 | return -EAGAIN; | |
3790 | ||
3791 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
3792 | ||
3793 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3794 | if (ret < 0) | |
3795 | req_set_fail(req); | |
3796 | io_req_complete(req, ret); | |
3797 | return 0; | |
3798 | } | |
3799 | ||
7a8721f8 DK |
3800 | static int io_symlinkat_prep(struct io_kiocb *req, |
3801 | const struct io_uring_sqe *sqe) | |
3802 | { | |
3803 | struct io_symlink *sl = &req->symlink; | |
3804 | const char __user *oldpath, *newpath; | |
3805 | ||
3806 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3807 | return -EINVAL; | |
3808 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
3809 | sqe->splice_fd_in) | |
3810 | return -EINVAL; | |
3811 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3812 | return -EBADF; | |
3813 | ||
3814 | sl->new_dfd = READ_ONCE(sqe->fd); | |
3815 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3816 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3817 | ||
3818 | sl->oldpath = getname(oldpath); | |
3819 | if (IS_ERR(sl->oldpath)) | |
3820 | return PTR_ERR(sl->oldpath); | |
3821 | ||
3822 | sl->newpath = getname(newpath); | |
3823 | if (IS_ERR(sl->newpath)) { | |
3824 | putname(sl->oldpath); | |
3825 | return PTR_ERR(sl->newpath); | |
3826 | } | |
3827 | ||
3828 | req->flags |= REQ_F_NEED_CLEANUP; | |
3829 | return 0; | |
3830 | } | |
3831 | ||
04f34081 | 3832 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
3833 | { |
3834 | struct io_symlink *sl = &req->symlink; | |
3835 | int ret; | |
3836 | ||
3837 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3838 | return -EAGAIN; | |
3839 | ||
3840 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
3841 | ||
3842 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3843 | if (ret < 0) | |
3844 | req_set_fail(req); | |
3845 | io_req_complete(req, ret); | |
3846 | return 0; | |
3847 | } | |
3848 | ||
cf30da90 DK |
3849 | static int io_linkat_prep(struct io_kiocb *req, |
3850 | const struct io_uring_sqe *sqe) | |
3851 | { | |
3852 | struct io_hardlink *lnk = &req->hardlink; | |
3853 | const char __user *oldf, *newf; | |
3854 | ||
3855 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3856 | return -EINVAL; | |
3857 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
3858 | return -EINVAL; | |
3859 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3860 | return -EBADF; | |
3861 | ||
3862 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
3863 | lnk->new_dfd = READ_ONCE(sqe->len); | |
3864 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3865 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3866 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
3867 | ||
3868 | lnk->oldpath = getname(oldf); | |
3869 | if (IS_ERR(lnk->oldpath)) | |
3870 | return PTR_ERR(lnk->oldpath); | |
3871 | ||
3872 | lnk->newpath = getname(newf); | |
3873 | if (IS_ERR(lnk->newpath)) { | |
3874 | putname(lnk->oldpath); | |
3875 | return PTR_ERR(lnk->newpath); | |
3876 | } | |
3877 | ||
3878 | req->flags |= REQ_F_NEED_CLEANUP; | |
3879 | return 0; | |
3880 | } | |
3881 | ||
04f34081 | 3882 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
3883 | { |
3884 | struct io_hardlink *lnk = &req->hardlink; | |
3885 | int ret; | |
3886 | ||
3887 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3888 | return -EAGAIN; | |
3889 | ||
3890 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
3891 | lnk->newpath, lnk->flags); | |
3892 | ||
3893 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3894 | if (ret < 0) | |
3895 | req_set_fail(req); | |
3896 | io_req_complete(req, ret); | |
3897 | return 0; | |
3898 | } | |
3899 | ||
36f4fa68 JA |
3900 | static int io_shutdown_prep(struct io_kiocb *req, |
3901 | const struct io_uring_sqe *sqe) | |
3902 | { | |
3903 | #if defined(CONFIG_NET) | |
3904 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3905 | return -EINVAL; | |
26578cda PB |
3906 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
3907 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
3908 | return -EINVAL; |
3909 | ||
3910 | req->shutdown.how = READ_ONCE(sqe->len); | |
3911 | return 0; | |
3912 | #else | |
3913 | return -EOPNOTSUPP; | |
3914 | #endif | |
3915 | } | |
3916 | ||
45d189c6 | 3917 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3918 | { |
3919 | #if defined(CONFIG_NET) | |
3920 | struct socket *sock; | |
3921 | int ret; | |
3922 | ||
45d189c6 | 3923 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3924 | return -EAGAIN; |
3925 | ||
48aba79b | 3926 | sock = sock_from_file(req->file); |
36f4fa68 | 3927 | if (unlikely(!sock)) |
48aba79b | 3928 | return -ENOTSOCK; |
36f4fa68 JA |
3929 | |
3930 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3931 | if (ret < 0) |
93d2bcd2 | 3932 | req_set_fail(req); |
36f4fa68 JA |
3933 | io_req_complete(req, ret); |
3934 | return 0; | |
3935 | #else | |
3936 | return -EOPNOTSUPP; | |
3937 | #endif | |
3938 | } | |
3939 | ||
f2a8d5c7 PB |
3940 | static int __io_splice_prep(struct io_kiocb *req, |
3941 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3942 | { |
fe7e3257 | 3943 | struct io_splice *sp = &req->splice; |
7d67af2c | 3944 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3945 | |
3232dd02 PB |
3946 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3947 | return -EINVAL; | |
7d67af2c PB |
3948 | |
3949 | sp->file_in = NULL; | |
7d67af2c PB |
3950 | sp->len = READ_ONCE(sqe->len); |
3951 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3952 | ||
3953 | if (unlikely(sp->flags & ~valid_flags)) | |
3954 | return -EINVAL; | |
3955 | ||
62906e89 | 3956 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
3957 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3958 | if (!sp->file_in) | |
3959 | return -EBADF; | |
7d67af2c | 3960 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3961 | return 0; |
3962 | } | |
3963 | ||
f2a8d5c7 PB |
3964 | static int io_tee_prep(struct io_kiocb *req, |
3965 | const struct io_uring_sqe *sqe) | |
3966 | { | |
3967 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3968 | return -EINVAL; | |
3969 | return __io_splice_prep(req, sqe); | |
3970 | } | |
3971 | ||
45d189c6 | 3972 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3973 | { |
3974 | struct io_splice *sp = &req->splice; | |
3975 | struct file *in = sp->file_in; | |
3976 | struct file *out = sp->file_out; | |
3977 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3978 | long ret = 0; | |
3979 | ||
45d189c6 | 3980 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3981 | return -EAGAIN; |
3982 | if (sp->len) | |
3983 | ret = do_tee(in, out, sp->len, flags); | |
3984 | ||
e1d767f0 PB |
3985 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3986 | io_put_file(in); | |
f2a8d5c7 PB |
3987 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3988 | ||
f2a8d5c7 | 3989 | if (ret != sp->len) |
93d2bcd2 | 3990 | req_set_fail(req); |
e1e16097 | 3991 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3992 | return 0; |
3993 | } | |
3994 | ||
3995 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3996 | { | |
fe7e3257 | 3997 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
3998 | |
3999 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4000 | sp->off_out = READ_ONCE(sqe->off); | |
4001 | return __io_splice_prep(req, sqe); | |
4002 | } | |
4003 | ||
45d189c6 | 4004 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4005 | { |
4006 | struct io_splice *sp = &req->splice; | |
4007 | struct file *in = sp->file_in; | |
4008 | struct file *out = sp->file_out; | |
4009 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4010 | loff_t *poff_in, *poff_out; | |
c9687426 | 4011 | long ret = 0; |
7d67af2c | 4012 | |
45d189c6 | 4013 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4014 | return -EAGAIN; |
7d67af2c PB |
4015 | |
4016 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4017 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4018 | |
948a7749 | 4019 | if (sp->len) |
c9687426 | 4020 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4021 | |
e1d767f0 PB |
4022 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4023 | io_put_file(in); | |
7d67af2c PB |
4024 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4025 | ||
7d67af2c | 4026 | if (ret != sp->len) |
93d2bcd2 | 4027 | req_set_fail(req); |
e1e16097 | 4028 | io_req_complete(req, ret); |
7d67af2c PB |
4029 | return 0; |
4030 | } | |
4031 | ||
2b188cc1 JA |
4032 | /* |
4033 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4034 | */ | |
889fca73 | 4035 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4036 | { |
4037 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4038 | |
def596e9 JA |
4039 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4040 | return -EINVAL; | |
4041 | ||
889fca73 | 4042 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4043 | return 0; |
4044 | } | |
4045 | ||
1155c76a | 4046 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4047 | { |
6b06314c | 4048 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4049 | |
09bb8394 JA |
4050 | if (!req->file) |
4051 | return -EBADF; | |
c992fe29 | 4052 | |
6b06314c | 4053 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4054 | return -EINVAL; |
26578cda PB |
4055 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4056 | sqe->splice_fd_in)) | |
c992fe29 CH |
4057 | return -EINVAL; |
4058 | ||
8ed8d3c3 JA |
4059 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4060 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4061 | return -EINVAL; | |
4062 | ||
4063 | req->sync.off = READ_ONCE(sqe->off); | |
4064 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4065 | return 0; |
4066 | } | |
4067 | ||
45d189c6 | 4068 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4069 | { |
8ed8d3c3 | 4070 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4071 | int ret; |
4072 | ||
ac45abc0 | 4073 | /* fsync always requires a blocking context */ |
45d189c6 | 4074 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4075 | return -EAGAIN; |
4076 | ||
9adbd45d | 4077 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4078 | end > 0 ? end : LLONG_MAX, |
4079 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4080 | if (ret < 0) | |
93d2bcd2 | 4081 | req_set_fail(req); |
e1e16097 | 4082 | io_req_complete(req, ret); |
c992fe29 CH |
4083 | return 0; |
4084 | } | |
4085 | ||
d63d1b5e JA |
4086 | static int io_fallocate_prep(struct io_kiocb *req, |
4087 | const struct io_uring_sqe *sqe) | |
4088 | { | |
26578cda PB |
4089 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4090 | sqe->splice_fd_in) | |
d63d1b5e | 4091 | return -EINVAL; |
3232dd02 PB |
4092 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4093 | return -EINVAL; | |
d63d1b5e JA |
4094 | |
4095 | req->sync.off = READ_ONCE(sqe->off); | |
4096 | req->sync.len = READ_ONCE(sqe->addr); | |
4097 | req->sync.mode = READ_ONCE(sqe->len); | |
4098 | return 0; | |
4099 | } | |
4100 | ||
45d189c6 | 4101 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4102 | { |
ac45abc0 PB |
4103 | int ret; |
4104 | ||
d63d1b5e | 4105 | /* fallocate always requiring blocking context */ |
45d189c6 | 4106 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4107 | return -EAGAIN; |
ac45abc0 PB |
4108 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4109 | req->sync.len); | |
ac45abc0 | 4110 | if (ret < 0) |
93d2bcd2 | 4111 | req_set_fail(req); |
e1e16097 | 4112 | io_req_complete(req, ret); |
5d17b4a4 JA |
4113 | return 0; |
4114 | } | |
4115 | ||
ec65fea5 | 4116 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4117 | { |
f8748881 | 4118 | const char __user *fname; |
15b71abe | 4119 | int ret; |
b7bb4f7d | 4120 | |
d3fddf6d PB |
4121 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4122 | return -EINVAL; | |
b9445598 | 4123 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4124 | return -EINVAL; |
ec65fea5 | 4125 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4126 | return -EBADF; |
03b1230c | 4127 | |
ec65fea5 PB |
4128 | /* open.how should be already initialised */ |
4129 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4130 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4131 | |
25e72d10 PB |
4132 | req->open.dfd = READ_ONCE(sqe->fd); |
4133 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4134 | req->open.filename = getname(fname); |
15b71abe JA |
4135 | if (IS_ERR(req->open.filename)) { |
4136 | ret = PTR_ERR(req->open.filename); | |
4137 | req->open.filename = NULL; | |
4138 | return ret; | |
4139 | } | |
b9445598 PB |
4140 | |
4141 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4142 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4143 | return -EINVAL; | |
4144 | ||
4022e7af | 4145 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4146 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4147 | return 0; |
03b1230c JA |
4148 | } |
4149 | ||
ec65fea5 PB |
4150 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4151 | { | |
d3fddf6d PB |
4152 | u64 mode = READ_ONCE(sqe->len); |
4153 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4154 | |
ec65fea5 PB |
4155 | req->open.how = build_open_how(flags, mode); |
4156 | return __io_openat_prep(req, sqe); | |
4157 | } | |
4158 | ||
cebdb986 | 4159 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4160 | { |
cebdb986 | 4161 | struct open_how __user *how; |
cebdb986 | 4162 | size_t len; |
0fa03c62 JA |
4163 | int ret; |
4164 | ||
cebdb986 JA |
4165 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4166 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4167 | if (len < OPEN_HOW_SIZE_VER0) |
4168 | return -EINVAL; | |
3529d8c2 | 4169 | |
cebdb986 JA |
4170 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4171 | len); | |
4172 | if (ret) | |
4173 | return ret; | |
3529d8c2 | 4174 | |
ec65fea5 | 4175 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4176 | } |
4177 | ||
45d189c6 | 4178 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4179 | { |
4180 | struct open_flags op; | |
15b71abe | 4181 | struct file *file; |
b9445598 PB |
4182 | bool resolve_nonblock, nonblock_set; |
4183 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4184 | int ret; |
4185 | ||
cebdb986 | 4186 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4187 | if (ret) |
4188 | goto err; | |
3a81fd02 JA |
4189 | nonblock_set = op.open_flag & O_NONBLOCK; |
4190 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4191 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4192 | /* |
4193 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4194 | * it'll always -EAGAIN | |
4195 | */ | |
4196 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4197 | return -EAGAIN; | |
4198 | op.lookup_flags |= LOOKUP_CACHED; | |
4199 | op.open_flag |= O_NONBLOCK; | |
4200 | } | |
15b71abe | 4201 | |
b9445598 PB |
4202 | if (!fixed) { |
4203 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4204 | if (ret < 0) | |
4205 | goto err; | |
4206 | } | |
15b71abe JA |
4207 | |
4208 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4209 | if (IS_ERR(file)) { |
944d1444 | 4210 | /* |
12dcb58a PB |
4211 | * We could hang on to this 'fd' on retrying, but seems like |
4212 | * marginal gain for something that is now known to be a slower | |
4213 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4214 | */ |
b9445598 PB |
4215 | if (!fixed) |
4216 | put_unused_fd(ret); | |
3a81fd02 | 4217 | |
15b71abe | 4218 | ret = PTR_ERR(file); |
12dcb58a PB |
4219 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4220 | if (ret == -EAGAIN && | |
4221 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4222 | return -EAGAIN; | |
4223 | goto err; | |
15b71abe | 4224 | } |
12dcb58a PB |
4225 | |
4226 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4227 | file->f_flags &= ~O_NONBLOCK; | |
4228 | fsnotify_open(file); | |
b9445598 PB |
4229 | |
4230 | if (!fixed) | |
4231 | fd_install(ret, file); | |
4232 | else | |
4233 | ret = io_install_fixed_file(req, file, issue_flags, | |
4234 | req->open.file_slot - 1); | |
15b71abe JA |
4235 | err: |
4236 | putname(req->open.filename); | |
8fef80bf | 4237 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4238 | if (ret < 0) |
93d2bcd2 | 4239 | req_set_fail(req); |
0bdf3398 | 4240 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4241 | return 0; |
4242 | } | |
4243 | ||
45d189c6 | 4244 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4245 | { |
e45cff58 | 4246 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4247 | } |
4248 | ||
067524e9 JA |
4249 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4250 | const struct io_uring_sqe *sqe) | |
4251 | { | |
4252 | struct io_provide_buf *p = &req->pbuf; | |
4253 | u64 tmp; | |
4254 | ||
26578cda PB |
4255 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4256 | sqe->splice_fd_in) | |
067524e9 JA |
4257 | return -EINVAL; |
4258 | ||
4259 | tmp = READ_ONCE(sqe->fd); | |
4260 | if (!tmp || tmp > USHRT_MAX) | |
4261 | return -EINVAL; | |
4262 | ||
4263 | memset(p, 0, sizeof(*p)); | |
4264 | p->nbufs = tmp; | |
4265 | p->bgid = READ_ONCE(sqe->buf_group); | |
4266 | return 0; | |
4267 | } | |
4268 | ||
4269 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4270 | int bgid, unsigned nbufs) | |
4271 | { | |
4272 | unsigned i = 0; | |
4273 | ||
4274 | /* shouldn't happen */ | |
4275 | if (!nbufs) | |
4276 | return 0; | |
4277 | ||
4278 | /* the head kbuf is the list itself */ | |
4279 | while (!list_empty(&buf->list)) { | |
4280 | struct io_buffer *nxt; | |
4281 | ||
4282 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4283 | list_del(&nxt->list); | |
4284 | kfree(nxt); | |
4285 | if (++i == nbufs) | |
4286 | return i; | |
4287 | } | |
4288 | i++; | |
4289 | kfree(buf); | |
9e15c3a0 | 4290 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4291 | |
4292 | return i; | |
4293 | } | |
4294 | ||
889fca73 | 4295 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4296 | { |
4297 | struct io_provide_buf *p = &req->pbuf; | |
4298 | struct io_ring_ctx *ctx = req->ctx; | |
4299 | struct io_buffer *head; | |
4300 | int ret = 0; | |
45d189c6 | 4301 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4302 | |
4303 | io_ring_submit_lock(ctx, !force_nonblock); | |
4304 | ||
4305 | lockdep_assert_held(&ctx->uring_lock); | |
4306 | ||
4307 | ret = -ENOENT; | |
9e15c3a0 | 4308 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4309 | if (head) |
4310 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4311 | if (ret < 0) |
93d2bcd2 | 4312 | req_set_fail(req); |
067524e9 | 4313 | |
9fb8cb49 PB |
4314 | /* complete before unlock, IOPOLL may need the lock */ |
4315 | __io_req_complete(req, issue_flags, ret, 0); | |
4316 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
4317 | return 0; |
4318 | } | |
4319 | ||
ddf0322d JA |
4320 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4321 | const struct io_uring_sqe *sqe) | |
4322 | { | |
38134ada | 4323 | unsigned long size, tmp_check; |
ddf0322d JA |
4324 | struct io_provide_buf *p = &req->pbuf; |
4325 | u64 tmp; | |
4326 | ||
26578cda | 4327 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4328 | return -EINVAL; |
4329 | ||
4330 | tmp = READ_ONCE(sqe->fd); | |
4331 | if (!tmp || tmp > USHRT_MAX) | |
4332 | return -E2BIG; | |
4333 | p->nbufs = tmp; | |
4334 | p->addr = READ_ONCE(sqe->addr); | |
4335 | p->len = READ_ONCE(sqe->len); | |
4336 | ||
38134ada PB |
4337 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4338 | &size)) | |
4339 | return -EOVERFLOW; | |
4340 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4341 | return -EOVERFLOW; | |
4342 | ||
d81269fe PB |
4343 | size = (unsigned long)p->len * p->nbufs; |
4344 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4345 | return -EFAULT; |
4346 | ||
4347 | p->bgid = READ_ONCE(sqe->buf_group); | |
4348 | tmp = READ_ONCE(sqe->off); | |
4349 | if (tmp > USHRT_MAX) | |
4350 | return -E2BIG; | |
4351 | p->bid = tmp; | |
4352 | return 0; | |
4353 | } | |
4354 | ||
4355 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4356 | { | |
4357 | struct io_buffer *buf; | |
4358 | u64 addr = pbuf->addr; | |
4359 | int i, bid = pbuf->bid; | |
4360 | ||
4361 | for (i = 0; i < pbuf->nbufs; i++) { | |
9990da93 | 4362 | buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); |
ddf0322d JA |
4363 | if (!buf) |
4364 | break; | |
4365 | ||
4366 | buf->addr = addr; | |
d1f82808 | 4367 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4368 | buf->bid = bid; |
4369 | addr += pbuf->len; | |
4370 | bid++; | |
4371 | if (!*head) { | |
4372 | INIT_LIST_HEAD(&buf->list); | |
4373 | *head = buf; | |
4374 | } else { | |
4375 | list_add_tail(&buf->list, &(*head)->list); | |
4376 | } | |
4377 | } | |
4378 | ||
4379 | return i ? i : -ENOMEM; | |
4380 | } | |
4381 | ||
889fca73 | 4382 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4383 | { |
4384 | struct io_provide_buf *p = &req->pbuf; | |
4385 | struct io_ring_ctx *ctx = req->ctx; | |
4386 | struct io_buffer *head, *list; | |
4387 | int ret = 0; | |
45d189c6 | 4388 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4389 | |
4390 | io_ring_submit_lock(ctx, !force_nonblock); | |
4391 | ||
4392 | lockdep_assert_held(&ctx->uring_lock); | |
4393 | ||
9e15c3a0 | 4394 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4395 | |
4396 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4397 | if (ret >= 0 && !list) { |
4398 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4399 | if (ret < 0) | |
067524e9 | 4400 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4401 | } |
ddf0322d | 4402 | if (ret < 0) |
93d2bcd2 | 4403 | req_set_fail(req); |
9fb8cb49 PB |
4404 | /* complete before unlock, IOPOLL may need the lock */ |
4405 | __io_req_complete(req, issue_flags, ret, 0); | |
4406 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4407 | return 0; |
cebdb986 JA |
4408 | } |
4409 | ||
3e4827b0 JA |
4410 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4411 | const struct io_uring_sqe *sqe) | |
4412 | { | |
4413 | #if defined(CONFIG_EPOLL) | |
26578cda | 4414 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4415 | return -EINVAL; |
2d74d042 | 4416 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4417 | return -EINVAL; |
3e4827b0 JA |
4418 | |
4419 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4420 | req->epoll.op = READ_ONCE(sqe->len); | |
4421 | req->epoll.fd = READ_ONCE(sqe->off); | |
4422 | ||
4423 | if (ep_op_has_event(req->epoll.op)) { | |
4424 | struct epoll_event __user *ev; | |
4425 | ||
4426 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4427 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4428 | return -EFAULT; | |
4429 | } | |
4430 | ||
4431 | return 0; | |
4432 | #else | |
4433 | return -EOPNOTSUPP; | |
4434 | #endif | |
4435 | } | |
4436 | ||
889fca73 | 4437 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4438 | { |
4439 | #if defined(CONFIG_EPOLL) | |
4440 | struct io_epoll *ie = &req->epoll; | |
4441 | int ret; | |
45d189c6 | 4442 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4443 | |
4444 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4445 | if (force_nonblock && ret == -EAGAIN) | |
4446 | return -EAGAIN; | |
4447 | ||
4448 | if (ret < 0) | |
93d2bcd2 | 4449 | req_set_fail(req); |
889fca73 | 4450 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4451 | return 0; |
4452 | #else | |
4453 | return -EOPNOTSUPP; | |
4454 | #endif | |
4455 | } | |
4456 | ||
c1ca757b JA |
4457 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4458 | { | |
4459 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4460 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4461 | return -EINVAL; |
3232dd02 PB |
4462 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4463 | return -EINVAL; | |
c1ca757b JA |
4464 | |
4465 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4466 | req->madvise.len = READ_ONCE(sqe->len); | |
4467 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4468 | return 0; | |
4469 | #else | |
4470 | return -EOPNOTSUPP; | |
4471 | #endif | |
4472 | } | |
4473 | ||
45d189c6 | 4474 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4475 | { |
4476 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4477 | struct io_madvise *ma = &req->madvise; | |
4478 | int ret; | |
4479 | ||
45d189c6 | 4480 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4481 | return -EAGAIN; |
4482 | ||
0726b01e | 4483 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4484 | if (ret < 0) |
93d2bcd2 | 4485 | req_set_fail(req); |
e1e16097 | 4486 | io_req_complete(req, ret); |
c1ca757b JA |
4487 | return 0; |
4488 | #else | |
4489 | return -EOPNOTSUPP; | |
4490 | #endif | |
4491 | } | |
4492 | ||
4840e418 JA |
4493 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4494 | { | |
26578cda | 4495 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4496 | return -EINVAL; |
3232dd02 PB |
4497 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4498 | return -EINVAL; | |
4840e418 JA |
4499 | |
4500 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4501 | req->fadvise.len = READ_ONCE(sqe->len); | |
4502 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4503 | return 0; | |
4504 | } | |
4505 | ||
45d189c6 | 4506 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4507 | { |
4508 | struct io_fadvise *fa = &req->fadvise; | |
4509 | int ret; | |
4510 | ||
45d189c6 | 4511 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4512 | switch (fa->advice) { |
4513 | case POSIX_FADV_NORMAL: | |
4514 | case POSIX_FADV_RANDOM: | |
4515 | case POSIX_FADV_SEQUENTIAL: | |
4516 | break; | |
4517 | default: | |
4518 | return -EAGAIN; | |
4519 | } | |
4520 | } | |
4840e418 JA |
4521 | |
4522 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4523 | if (ret < 0) | |
93d2bcd2 | 4524 | req_set_fail(req); |
0bdf3398 | 4525 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4526 | return 0; |
4527 | } | |
4528 | ||
eddc7ef5 JA |
4529 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4530 | { | |
2d74d042 | 4531 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4532 | return -EINVAL; |
26578cda | 4533 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4534 | return -EINVAL; |
9c280f90 | 4535 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4536 | return -EBADF; |
eddc7ef5 | 4537 | |
1d9e1288 BM |
4538 | req->statx.dfd = READ_ONCE(sqe->fd); |
4539 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4540 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4541 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4542 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4543 | |
4544 | return 0; | |
4545 | } | |
4546 | ||
45d189c6 | 4547 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4548 | { |
1d9e1288 | 4549 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4550 | int ret; |
4551 | ||
59d70013 | 4552 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4553 | return -EAGAIN; |
4554 | ||
e62753e4 BM |
4555 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4556 | ctx->buffer); | |
eddc7ef5 | 4557 | |
eddc7ef5 | 4558 | if (ret < 0) |
93d2bcd2 | 4559 | req_set_fail(req); |
e1e16097 | 4560 | io_req_complete(req, ret); |
eddc7ef5 JA |
4561 | return 0; |
4562 | } | |
4563 | ||
b5dba59e JA |
4564 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4565 | { | |
14587a46 | 4566 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4567 | return -EINVAL; |
b5dba59e | 4568 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 4569 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 4570 | return -EINVAL; |
9c280f90 | 4571 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4572 | return -EBADF; |
b5dba59e JA |
4573 | |
4574 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
4575 | req->close.file_slot = READ_ONCE(sqe->file_index); |
4576 | if (req->close.file_slot && req->close.fd) | |
4577 | return -EINVAL; | |
4578 | ||
b5dba59e | 4579 | return 0; |
b5dba59e JA |
4580 | } |
4581 | ||
889fca73 | 4582 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4583 | { |
9eac1904 | 4584 | struct files_struct *files = current->files; |
3af73b28 | 4585 | struct io_close *close = &req->close; |
9eac1904 | 4586 | struct fdtable *fdt; |
a1fde923 PB |
4587 | struct file *file = NULL; |
4588 | int ret = -EBADF; | |
b5dba59e | 4589 | |
7df778be PB |
4590 | if (req->close.file_slot) { |
4591 | ret = io_close_fixed(req, issue_flags); | |
4592 | goto err; | |
4593 | } | |
4594 | ||
9eac1904 JA |
4595 | spin_lock(&files->file_lock); |
4596 | fdt = files_fdtable(files); | |
4597 | if (close->fd >= fdt->max_fds) { | |
4598 | spin_unlock(&files->file_lock); | |
4599 | goto err; | |
4600 | } | |
4601 | file = fdt->fd[close->fd]; | |
a1fde923 | 4602 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4603 | spin_unlock(&files->file_lock); |
4604 | file = NULL; | |
4605 | goto err; | |
3af73b28 | 4606 | } |
b5dba59e JA |
4607 | |
4608 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4609 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4610 | spin_unlock(&files->file_lock); |
0bf0eefd | 4611 | return -EAGAIN; |
a2100672 | 4612 | } |
b5dba59e | 4613 | |
9eac1904 JA |
4614 | ret = __close_fd_get_file(close->fd, &file); |
4615 | spin_unlock(&files->file_lock); | |
4616 | if (ret < 0) { | |
4617 | if (ret == -ENOENT) | |
4618 | ret = -EBADF; | |
4619 | goto err; | |
4620 | } | |
4621 | ||
3af73b28 | 4622 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4623 | ret = filp_close(file, current->files); |
4624 | err: | |
3af73b28 | 4625 | if (ret < 0) |
93d2bcd2 | 4626 | req_set_fail(req); |
9eac1904 JA |
4627 | if (file) |
4628 | fput(file); | |
889fca73 | 4629 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4630 | return 0; |
b5dba59e JA |
4631 | } |
4632 | ||
1155c76a | 4633 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4634 | { |
4635 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4636 | |
5d17b4a4 JA |
4637 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4638 | return -EINVAL; | |
26578cda PB |
4639 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4640 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4641 | return -EINVAL; |
4642 | ||
8ed8d3c3 JA |
4643 | req->sync.off = READ_ONCE(sqe->off); |
4644 | req->sync.len = READ_ONCE(sqe->len); | |
4645 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4646 | return 0; |
4647 | } | |
4648 | ||
45d189c6 | 4649 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4650 | { |
8ed8d3c3 JA |
4651 | int ret; |
4652 | ||
ac45abc0 | 4653 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4654 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4655 | return -EAGAIN; |
4656 | ||
9adbd45d | 4657 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4658 | req->sync.flags); |
4659 | if (ret < 0) | |
93d2bcd2 | 4660 | req_set_fail(req); |
e1e16097 | 4661 | io_req_complete(req, ret); |
5d17b4a4 JA |
4662 | return 0; |
4663 | } | |
4664 | ||
469956e8 | 4665 | #if defined(CONFIG_NET) |
02d27d89 PB |
4666 | static int io_setup_async_msg(struct io_kiocb *req, |
4667 | struct io_async_msghdr *kmsg) | |
4668 | { | |
e8c2bc1f JA |
4669 | struct io_async_msghdr *async_msg = req->async_data; |
4670 | ||
4671 | if (async_msg) | |
02d27d89 | 4672 | return -EAGAIN; |
e8c2bc1f | 4673 | if (io_alloc_async_data(req)) { |
257e84a5 | 4674 | kfree(kmsg->free_iov); |
02d27d89 PB |
4675 | return -ENOMEM; |
4676 | } | |
e8c2bc1f | 4677 | async_msg = req->async_data; |
02d27d89 | 4678 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4679 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4680 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4681 | /* if were using fast_iov, set it to the new one */ |
4682 | if (!async_msg->free_iov) | |
4683 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4684 | ||
02d27d89 PB |
4685 | return -EAGAIN; |
4686 | } | |
4687 | ||
2ae523ed PB |
4688 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4689 | struct io_async_msghdr *iomsg) | |
4690 | { | |
2ae523ed | 4691 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4692 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4693 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4694 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4695 | } |
4696 | ||
93642ef8 PB |
4697 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4698 | { | |
4699 | int ret; | |
4700 | ||
93642ef8 PB |
4701 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4702 | if (!ret) | |
4703 | req->flags |= REQ_F_NEED_CLEANUP; | |
4704 | return ret; | |
4705 | } | |
4706 | ||
3529d8c2 | 4707 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4708 | { |
e47293fd | 4709 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4710 | |
d2b6f48b PB |
4711 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4712 | return -EINVAL; | |
4713 | ||
270a5940 | 4714 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4715 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4716 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4717 | if (sr->msg_flags & MSG_DONTWAIT) | |
4718 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4719 | |
d8768362 JA |
4720 | #ifdef CONFIG_COMPAT |
4721 | if (req->ctx->compat) | |
4722 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4723 | #endif | |
93642ef8 | 4724 | return 0; |
03b1230c JA |
4725 | } |
4726 | ||
889fca73 | 4727 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4728 | { |
6b754c8b | 4729 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4730 | struct socket *sock; |
7a7cacba | 4731 | unsigned flags; |
0031275d | 4732 | int min_ret = 0; |
0fa03c62 JA |
4733 | int ret; |
4734 | ||
dba4a925 | 4735 | sock = sock_from_file(req->file); |
7a7cacba | 4736 | if (unlikely(!sock)) |
dba4a925 | 4737 | return -ENOTSOCK; |
3529d8c2 | 4738 | |
d886e185 PB |
4739 | if (req_has_async_data(req)) { |
4740 | kmsg = req->async_data; | |
4741 | } else { | |
7a7cacba PB |
4742 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4743 | if (ret) | |
4744 | return ret; | |
4745 | kmsg = &iomsg; | |
0fa03c62 | 4746 | } |
0fa03c62 | 4747 | |
04411806 PB |
4748 | flags = req->sr_msg.msg_flags; |
4749 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4750 | flags |= MSG_DONTWAIT; |
0031275d SM |
4751 | if (flags & MSG_WAITALL) |
4752 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4753 | ||
7a7cacba | 4754 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4755 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4756 | return io_setup_async_msg(req, kmsg); |
4757 | if (ret == -ERESTARTSYS) | |
4758 | ret = -EINTR; | |
0fa03c62 | 4759 | |
257e84a5 PB |
4760 | /* fast path, check for non-NULL to avoid function call */ |
4761 | if (kmsg->free_iov) | |
4762 | kfree(kmsg->free_iov); | |
99bc4c38 | 4763 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4764 | if (ret < min_ret) |
93d2bcd2 | 4765 | req_set_fail(req); |
889fca73 | 4766 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4767 | return 0; |
03b1230c | 4768 | } |
aa1fa28f | 4769 | |
889fca73 | 4770 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4771 | { |
7a7cacba PB |
4772 | struct io_sr_msg *sr = &req->sr_msg; |
4773 | struct msghdr msg; | |
4774 | struct iovec iov; | |
fddaface | 4775 | struct socket *sock; |
7a7cacba | 4776 | unsigned flags; |
0031275d | 4777 | int min_ret = 0; |
fddaface JA |
4778 | int ret; |
4779 | ||
dba4a925 | 4780 | sock = sock_from_file(req->file); |
7a7cacba | 4781 | if (unlikely(!sock)) |
dba4a925 | 4782 | return -ENOTSOCK; |
fddaface | 4783 | |
7a7cacba PB |
4784 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4785 | if (unlikely(ret)) | |
14db8411 | 4786 | return ret; |
fddaface | 4787 | |
7a7cacba PB |
4788 | msg.msg_name = NULL; |
4789 | msg.msg_control = NULL; | |
4790 | msg.msg_controllen = 0; | |
4791 | msg.msg_namelen = 0; | |
fddaface | 4792 | |
04411806 PB |
4793 | flags = req->sr_msg.msg_flags; |
4794 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4795 | flags |= MSG_DONTWAIT; |
0031275d SM |
4796 | if (flags & MSG_WAITALL) |
4797 | min_ret = iov_iter_count(&msg.msg_iter); | |
4798 | ||
7a7cacba PB |
4799 | msg.msg_flags = flags; |
4800 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4801 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4802 | return -EAGAIN; |
4803 | if (ret == -ERESTARTSYS) | |
4804 | ret = -EINTR; | |
fddaface | 4805 | |
0031275d | 4806 | if (ret < min_ret) |
93d2bcd2 | 4807 | req_set_fail(req); |
889fca73 | 4808 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4809 | return 0; |
fddaface JA |
4810 | } |
4811 | ||
1400e697 PB |
4812 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4813 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4814 | { |
4815 | struct io_sr_msg *sr = &req->sr_msg; | |
4816 | struct iovec __user *uiov; | |
4817 | size_t iov_len; | |
4818 | int ret; | |
4819 | ||
1400e697 PB |
4820 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4821 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4822 | if (ret) |
4823 | return ret; | |
4824 | ||
4825 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4826 | if (iov_len > 1) | |
4827 | return -EINVAL; | |
5476dfed | 4828 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4829 | return -EFAULT; |
5476dfed | 4830 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4831 | iomsg->free_iov = NULL; |
52de1fe1 | 4832 | } else { |
257e84a5 | 4833 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4834 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4835 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4836 | false); |
52de1fe1 JA |
4837 | if (ret > 0) |
4838 | ret = 0; | |
4839 | } | |
4840 | ||
4841 | return ret; | |
4842 | } | |
4843 | ||
4844 | #ifdef CONFIG_COMPAT | |
4845 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4846 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4847 | { |
52de1fe1 JA |
4848 | struct io_sr_msg *sr = &req->sr_msg; |
4849 | struct compat_iovec __user *uiov; | |
4850 | compat_uptr_t ptr; | |
4851 | compat_size_t len; | |
4852 | int ret; | |
4853 | ||
4af3417a PB |
4854 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4855 | &ptr, &len); | |
52de1fe1 JA |
4856 | if (ret) |
4857 | return ret; | |
4858 | ||
4859 | uiov = compat_ptr(ptr); | |
4860 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4861 | compat_ssize_t clen; | |
4862 | ||
4863 | if (len > 1) | |
4864 | return -EINVAL; | |
4865 | if (!access_ok(uiov, sizeof(*uiov))) | |
4866 | return -EFAULT; | |
4867 | if (__get_user(clen, &uiov->iov_len)) | |
4868 | return -EFAULT; | |
4869 | if (clen < 0) | |
4870 | return -EINVAL; | |
2d280bc8 | 4871 | sr->len = clen; |
257e84a5 | 4872 | iomsg->free_iov = NULL; |
52de1fe1 | 4873 | } else { |
257e84a5 | 4874 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4875 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4876 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4877 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4878 | if (ret < 0) |
4879 | return ret; | |
4880 | } | |
4881 | ||
4882 | return 0; | |
4883 | } | |
4884 | #endif | |
4885 | ||
1400e697 PB |
4886 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4887 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4888 | { |
1400e697 | 4889 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4890 | |
4891 | #ifdef CONFIG_COMPAT | |
4892 | if (req->ctx->compat) | |
1400e697 | 4893 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4894 | #endif |
52de1fe1 | 4895 | |
1400e697 | 4896 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4897 | } |
4898 | ||
bcda7baa | 4899 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
51aac424 | 4900 | unsigned int issue_flags) |
bcda7baa JA |
4901 | { |
4902 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 4903 | |
51aac424 | 4904 | return io_buffer_select(req, &sr->len, sr->bgid, issue_flags); |
fddaface JA |
4905 | } |
4906 | ||
7fbb1b54 PB |
4907 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4908 | { | |
30d51dd4 | 4909 | return io_put_kbuf(req, req->kbuf); |
7fbb1b54 PB |
4910 | } |
4911 | ||
93642ef8 | 4912 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4913 | { |
99bc4c38 | 4914 | int ret; |
3529d8c2 | 4915 | |
93642ef8 PB |
4916 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4917 | if (!ret) | |
4918 | req->flags |= REQ_F_NEED_CLEANUP; | |
4919 | return ret; | |
4920 | } | |
4921 | ||
4922 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4923 | { | |
4924 | struct io_sr_msg *sr = &req->sr_msg; | |
4925 | ||
d2b6f48b PB |
4926 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4927 | return -EINVAL; | |
4928 | ||
270a5940 | 4929 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4930 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4931 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4932 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4933 | if (sr->msg_flags & MSG_DONTWAIT) | |
4934 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4935 | |
d8768362 JA |
4936 | #ifdef CONFIG_COMPAT |
4937 | if (req->ctx->compat) | |
4938 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4939 | #endif | |
93642ef8 | 4940 | return 0; |
aa1fa28f JA |
4941 | } |
4942 | ||
889fca73 | 4943 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4944 | { |
6b754c8b | 4945 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4946 | struct socket *sock; |
7fbb1b54 | 4947 | struct io_buffer *kbuf; |
7a7cacba | 4948 | unsigned flags; |
0031275d | 4949 | int min_ret = 0; |
52de1fe1 | 4950 | int ret, cflags = 0; |
45d189c6 | 4951 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4952 | |
dba4a925 | 4953 | sock = sock_from_file(req->file); |
7a7cacba | 4954 | if (unlikely(!sock)) |
dba4a925 | 4955 | return -ENOTSOCK; |
3529d8c2 | 4956 | |
d886e185 PB |
4957 | if (req_has_async_data(req)) { |
4958 | kmsg = req->async_data; | |
4959 | } else { | |
7a7cacba PB |
4960 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4961 | if (ret) | |
681fda8d | 4962 | return ret; |
7a7cacba PB |
4963 | kmsg = &iomsg; |
4964 | } | |
03b1230c | 4965 | |
bc02ef33 | 4966 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 4967 | kbuf = io_recv_buffer_select(req, issue_flags); |
bc02ef33 | 4968 | if (IS_ERR(kbuf)) |
52de1fe1 | 4969 | return PTR_ERR(kbuf); |
7a7cacba | 4970 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4971 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4972 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4973 | 1, req->sr_msg.len); |
4974 | } | |
52de1fe1 | 4975 | |
04411806 PB |
4976 | flags = req->sr_msg.msg_flags; |
4977 | if (force_nonblock) | |
7a7cacba | 4978 | flags |= MSG_DONTWAIT; |
0031275d SM |
4979 | if (flags & MSG_WAITALL) |
4980 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4981 | ||
7a7cacba PB |
4982 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4983 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4984 | if (force_nonblock && ret == -EAGAIN) |
4985 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4986 | if (ret == -ERESTARTSYS) |
4987 | ret = -EINTR; | |
03b1230c | 4988 | |
7fbb1b54 PB |
4989 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4990 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4991 | /* fast path, check for non-NULL to avoid function call */ |
4992 | if (kmsg->free_iov) | |
4993 | kfree(kmsg->free_iov); | |
99bc4c38 | 4994 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4995 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4996 | req_set_fail(req); |
889fca73 | 4997 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4998 | return 0; |
0fa03c62 | 4999 | } |
5d17b4a4 | 5000 | |
889fca73 | 5001 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5002 | { |
6b754c8b | 5003 | struct io_buffer *kbuf; |
7a7cacba PB |
5004 | struct io_sr_msg *sr = &req->sr_msg; |
5005 | struct msghdr msg; | |
5006 | void __user *buf = sr->buf; | |
fddaface | 5007 | struct socket *sock; |
7a7cacba PB |
5008 | struct iovec iov; |
5009 | unsigned flags; | |
0031275d | 5010 | int min_ret = 0; |
bcda7baa | 5011 | int ret, cflags = 0; |
45d189c6 | 5012 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5013 | |
dba4a925 | 5014 | sock = sock_from_file(req->file); |
7a7cacba | 5015 | if (unlikely(!sock)) |
dba4a925 | 5016 | return -ENOTSOCK; |
fddaface | 5017 | |
bc02ef33 | 5018 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5019 | kbuf = io_recv_buffer_select(req, issue_flags); |
bcda7baa JA |
5020 | if (IS_ERR(kbuf)) |
5021 | return PTR_ERR(kbuf); | |
7a7cacba | 5022 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5023 | } |
bcda7baa | 5024 | |
7a7cacba | 5025 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5026 | if (unlikely(ret)) |
5027 | goto out_free; | |
fddaface | 5028 | |
7a7cacba PB |
5029 | msg.msg_name = NULL; |
5030 | msg.msg_control = NULL; | |
5031 | msg.msg_controllen = 0; | |
5032 | msg.msg_namelen = 0; | |
5033 | msg.msg_iocb = NULL; | |
5034 | msg.msg_flags = 0; | |
fddaface | 5035 | |
04411806 PB |
5036 | flags = req->sr_msg.msg_flags; |
5037 | if (force_nonblock) | |
7a7cacba | 5038 | flags |= MSG_DONTWAIT; |
0031275d SM |
5039 | if (flags & MSG_WAITALL) |
5040 | min_ret = iov_iter_count(&msg.msg_iter); | |
5041 | ||
7a7cacba PB |
5042 | ret = sock_recvmsg(sock, &msg, flags); |
5043 | if (force_nonblock && ret == -EAGAIN) | |
5044 | return -EAGAIN; | |
5045 | if (ret == -ERESTARTSYS) | |
5046 | ret = -EINTR; | |
14c32eee | 5047 | out_free: |
7fbb1b54 PB |
5048 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5049 | cflags = io_put_recv_kbuf(req); | |
0031275d | 5050 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5051 | req_set_fail(req); |
889fca73 | 5052 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5053 | return 0; |
fddaface JA |
5054 | } |
5055 | ||
3529d8c2 | 5056 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5057 | { |
8ed8d3c3 JA |
5058 | struct io_accept *accept = &req->accept; |
5059 | ||
14587a46 | 5060 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5061 | return -EINVAL; |
aaa4db12 | 5062 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5063 | return -EINVAL; |
5064 | ||
d55e5f5b JA |
5065 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5066 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5067 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5068 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5069 | |
aaa4db12 PB |
5070 | accept->file_slot = READ_ONCE(sqe->file_index); |
5071 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
5072 | (accept->flags & SOCK_CLOEXEC))) | |
5073 | return -EINVAL; | |
a7083ad5 PB |
5074 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5075 | return -EINVAL; | |
5076 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5077 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5078 | return 0; |
8ed8d3c3 | 5079 | } |
17f2fe35 | 5080 | |
889fca73 | 5081 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5082 | { |
5083 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5084 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5085 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5086 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5087 | struct file *file; |
5088 | int ret, fd; | |
8ed8d3c3 | 5089 | |
e697deed JX |
5090 | if (req->file->f_flags & O_NONBLOCK) |
5091 | req->flags |= REQ_F_NOWAIT; | |
5092 | ||
aaa4db12 PB |
5093 | if (!fixed) { |
5094 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5095 | if (unlikely(fd < 0)) | |
5096 | return fd; | |
5097 | } | |
a7083ad5 PB |
5098 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5099 | accept->flags); | |
5100 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5101 | if (!fixed) |
5102 | put_unused_fd(fd); | |
a7083ad5 PB |
5103 | ret = PTR_ERR(file); |
5104 | if (ret == -EAGAIN && force_nonblock) | |
5105 | return -EAGAIN; | |
ac45abc0 PB |
5106 | if (ret == -ERESTARTSYS) |
5107 | ret = -EINTR; | |
93d2bcd2 | 5108 | req_set_fail(req); |
aaa4db12 | 5109 | } else if (!fixed) { |
a7083ad5 PB |
5110 | fd_install(fd, file); |
5111 | ret = fd; | |
aaa4db12 PB |
5112 | } else { |
5113 | ret = io_install_fixed_file(req, file, issue_flags, | |
5114 | accept->file_slot - 1); | |
ac45abc0 | 5115 | } |
889fca73 | 5116 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5117 | return 0; |
8ed8d3c3 JA |
5118 | } |
5119 | ||
93642ef8 PB |
5120 | static int io_connect_prep_async(struct io_kiocb *req) |
5121 | { | |
5122 | struct io_async_connect *io = req->async_data; | |
5123 | struct io_connect *conn = &req->connect; | |
5124 | ||
5125 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5126 | } | |
5127 | ||
3529d8c2 | 5128 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5129 | { |
3529d8c2 | 5130 | struct io_connect *conn = &req->connect; |
f499a021 | 5131 | |
14587a46 | 5132 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5133 | return -EINVAL; |
26578cda PB |
5134 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5135 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5136 | return -EINVAL; |
5137 | ||
3529d8c2 JA |
5138 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5139 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5140 | return 0; |
f499a021 JA |
5141 | } |
5142 | ||
889fca73 | 5143 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5144 | { |
e8c2bc1f | 5145 | struct io_async_connect __io, *io; |
f8e85cf2 | 5146 | unsigned file_flags; |
3fbb51c1 | 5147 | int ret; |
45d189c6 | 5148 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5149 | |
d886e185 | 5150 | if (req_has_async_data(req)) { |
e8c2bc1f | 5151 | io = req->async_data; |
f499a021 | 5152 | } else { |
3529d8c2 JA |
5153 | ret = move_addr_to_kernel(req->connect.addr, |
5154 | req->connect.addr_len, | |
e8c2bc1f | 5155 | &__io.address); |
f499a021 JA |
5156 | if (ret) |
5157 | goto out; | |
5158 | io = &__io; | |
5159 | } | |
5160 | ||
3fbb51c1 JA |
5161 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5162 | ||
e8c2bc1f | 5163 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5164 | req->connect.addr_len, file_flags); |
87f80d62 | 5165 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 5166 | if (req_has_async_data(req)) |
b7bb4f7d | 5167 | return -EAGAIN; |
e8c2bc1f | 5168 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5169 | ret = -ENOMEM; |
5170 | goto out; | |
5171 | } | |
e8c2bc1f | 5172 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5173 | return -EAGAIN; |
f499a021 | 5174 | } |
f8e85cf2 JA |
5175 | if (ret == -ERESTARTSYS) |
5176 | ret = -EINTR; | |
f499a021 | 5177 | out: |
4e88d6e7 | 5178 | if (ret < 0) |
93d2bcd2 | 5179 | req_set_fail(req); |
889fca73 | 5180 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5181 | return 0; |
469956e8 Y |
5182 | } |
5183 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5184 | #define IO_NETOP_FN(op) \ |
5185 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5186 | { \ | |
5187 | return -EOPNOTSUPP; \ | |
5188 | } | |
5189 | ||
5190 | #define IO_NETOP_PREP(op) \ | |
5191 | IO_NETOP_FN(op) \ | |
5192 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5193 | { \ | |
5194 | return -EOPNOTSUPP; \ | |
5195 | } \ | |
5196 | ||
5197 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5198 | IO_NETOP_PREP(op) \ | |
5199 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5200 | { \ | |
5201 | return -EOPNOTSUPP; \ | |
5202 | } | |
5203 | ||
5204 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5205 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5206 | IO_NETOP_PREP_ASYNC(connect); | |
5207 | IO_NETOP_PREP(accept); | |
5208 | IO_NETOP_FN(send); | |
5209 | IO_NETOP_FN(recv); | |
469956e8 | 5210 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5211 | |
d7718a9d JA |
5212 | struct io_poll_table { |
5213 | struct poll_table_struct pt; | |
5214 | struct io_kiocb *req; | |
68b11e8b | 5215 | int nr_entries; |
d7718a9d JA |
5216 | int error; |
5217 | }; | |
ce593a6c | 5218 | |
d7718a9d | 5219 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 5220 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 5221 | { |
d7718a9d JA |
5222 | /* for instances that support it check for an event match first: */ |
5223 | if (mask && !(mask & poll->events)) | |
5224 | return 0; | |
5225 | ||
5226 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5227 | ||
5228 | list_del_init(&poll->wait.entry); | |
5229 | ||
d7718a9d | 5230 | req->result = mask; |
5b0a6acc | 5231 | req->io_task_work.func = func; |
6d816e08 | 5232 | |
d7718a9d | 5233 | /* |
e3aabf95 JA |
5234 | * If this fails, then the task is exiting. When a task exits, the |
5235 | * work gets canceled, so just cancel this request as well instead | |
5236 | * of executing it. We can't safely execute it anyway, as we may not | |
5237 | * have the needed state needed for it anyway. | |
d7718a9d | 5238 | */ |
e09ee510 | 5239 | io_req_task_work_add(req); |
d7718a9d JA |
5240 | return 1; |
5241 | } | |
5242 | ||
74ce6ce4 JA |
5243 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5244 | __acquires(&req->ctx->completion_lock) | |
5245 | { | |
5246 | struct io_ring_ctx *ctx = req->ctx; | |
5247 | ||
316319e8 | 5248 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 PB |
5249 | if (unlikely(req->task->flags & PF_EXITING)) |
5250 | WRITE_ONCE(poll->canceled, true); | |
5251 | ||
74ce6ce4 JA |
5252 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5253 | struct poll_table_struct pt = { ._key = poll->events }; | |
5254 | ||
5255 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5256 | } | |
5257 | ||
79ebeaee | 5258 | spin_lock(&ctx->completion_lock); |
74ce6ce4 JA |
5259 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5260 | add_wait_queue(poll->head, &poll->wait); | |
5261 | return true; | |
5262 | } | |
5263 | ||
5264 | return false; | |
5265 | } | |
5266 | ||
d4e7cd36 | 5267 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5268 | { |
e8c2bc1f | 5269 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5270 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5271 | return req->async_data; |
d4e7cd36 JA |
5272 | return req->apoll->double_poll; |
5273 | } | |
5274 | ||
5275 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5276 | { | |
5277 | if (req->opcode == IORING_OP_POLL_ADD) | |
5278 | return &req->poll; | |
5279 | return &req->apoll->poll; | |
5280 | } | |
5281 | ||
5282 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 5283 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
5284 | { |
5285 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5286 | |
5287 | lockdep_assert_held(&req->ctx->completion_lock); | |
5288 | ||
5289 | if (poll && poll->head) { | |
5290 | struct wait_queue_head *head = poll->head; | |
5291 | ||
79ebeaee | 5292 | spin_lock_irq(&head->lock); |
18bceab1 JA |
5293 | list_del_init(&poll->wait.entry); |
5294 | if (poll->wait.private) | |
de9b4cca | 5295 | req_ref_put(req); |
18bceab1 | 5296 | poll->head = NULL; |
79ebeaee | 5297 | spin_unlock_irq(&head->lock); |
18bceab1 JA |
5298 | } |
5299 | } | |
5300 | ||
31efe48e | 5301 | static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 5302 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
5303 | { |
5304 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 5305 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 5306 | int error; |
18bceab1 | 5307 | |
e27414be | 5308 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 5309 | error = -ECANCELED; |
88e41cf9 | 5310 | req->poll.events |= EPOLLONESHOT; |
e27414be | 5311 | } else { |
5082620f | 5312 | error = mangle_poll(mask); |
e27414be | 5313 | } |
b69de288 JA |
5314 | if (req->poll.events & EPOLLONESHOT) |
5315 | flags = 0; | |
a62682f9 HX |
5316 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
5317 | req->poll.events |= EPOLLONESHOT; | |
88e41cf9 | 5318 | flags = 0; |
a62682f9 | 5319 | } |
7b289c38 HX |
5320 | if (flags & IORING_CQE_F_MORE) |
5321 | ctx->cq_extra++; | |
18bceab1 | 5322 | |
88e41cf9 | 5323 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
5324 | } |
5325 | ||
f237c30a | 5326 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5327 | { |
5328 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 5329 | struct io_kiocb *nxt; |
18bceab1 JA |
5330 | |
5331 | if (io_poll_rewait(req, &req->poll)) { | |
79ebeaee | 5332 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5333 | } else { |
f40b964a | 5334 | bool done; |
18bceab1 | 5335 | |
5b7aa38d HX |
5336 | if (req->poll.done) { |
5337 | spin_unlock(&ctx->completion_lock); | |
5338 | return; | |
5339 | } | |
31efe48e | 5340 | done = __io_poll_complete(req, req->result); |
88e41cf9 | 5341 | if (done) { |
a890d01e | 5342 | io_poll_remove_double(req); |
88e41cf9 | 5343 | hash_del(&req->hash_node); |
bd99c71b | 5344 | req->poll.done = true; |
f40b964a | 5345 | } else { |
88e41cf9 JA |
5346 | req->result = 0; |
5347 | add_wait_queue(req->poll.head, &req->poll.wait); | |
5348 | } | |
31efe48e | 5349 | io_commit_cqring(ctx); |
79ebeaee | 5350 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5351 | io_cqring_ev_posted(ctx); |
18bceab1 | 5352 | |
88e41cf9 JA |
5353 | if (done) { |
5354 | nxt = io_put_req_find_next(req); | |
5355 | if (nxt) | |
f237c30a | 5356 | io_req_task_submit(nxt, locked); |
88e41cf9 | 5357 | } |
dd221f46 | 5358 | } |
18bceab1 JA |
5359 | } |
5360 | ||
5361 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5362 | int sync, void *key) | |
5363 | { | |
5364 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5365 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 | 5366 | __poll_t mask = key_to_poll(key); |
79ebeaee | 5367 | unsigned long flags; |
18bceab1 JA |
5368 | |
5369 | /* for instances that support it check for an event match first: */ | |
5370 | if (mask && !(mask & poll->events)) | |
5371 | return 0; | |
88e41cf9 JA |
5372 | if (!(poll->events & EPOLLONESHOT)) |
5373 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5374 | |
8706e04e JA |
5375 | list_del_init(&wait->entry); |
5376 | ||
9ce85ef2 | 5377 | if (poll->head) { |
18bceab1 JA |
5378 | bool done; |
5379 | ||
79ebeaee | 5380 | spin_lock_irqsave(&poll->head->lock, flags); |
807abcb0 | 5381 | done = list_empty(&poll->wait.entry); |
18bceab1 | 5382 | if (!done) |
807abcb0 | 5383 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5384 | /* make sure double remove sees this as being gone */ |
5385 | wait->private = NULL; | |
79ebeaee | 5386 | spin_unlock_irqrestore(&poll->head->lock, flags); |
c8b5e260 JA |
5387 | if (!done) { |
5388 | /* use wait func handler, so it matches the rq type */ | |
5389 | poll->wait.func(&poll->wait, mode, sync, key); | |
5390 | } | |
18bceab1 | 5391 | } |
de9b4cca | 5392 | req_ref_put(req); |
18bceab1 JA |
5393 | return 1; |
5394 | } | |
5395 | ||
5396 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5397 | wait_queue_func_t wake_func) | |
5398 | { | |
5399 | poll->head = NULL; | |
5400 | poll->done = false; | |
5401 | poll->canceled = false; | |
464dca61 JA |
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; | |
18bceab1 JA |
5405 | INIT_LIST_HEAD(&poll->wait.entry); |
5406 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5407 | } | |
5408 | ||
5409 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5410 | struct wait_queue_head *head, |
5411 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5412 | { |
5413 | struct io_kiocb *req = pt->req; | |
5414 | ||
5415 | /* | |
68b11e8b PB |
5416 | * The file being polled uses multiple waitqueues for poll handling |
5417 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5418 | * if this happens. | |
18bceab1 | 5419 | */ |
68b11e8b | 5420 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5421 | struct io_poll_iocb *poll_one = poll; |
5422 | ||
23a65db8 PB |
5423 | /* double add on the same waitqueue head, ignore */ |
5424 | if (poll_one->head == head) | |
5425 | return; | |
18bceab1 | 5426 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5427 | if (*poll_ptr) { |
23a65db8 PB |
5428 | if ((*poll_ptr)->head == head) |
5429 | return; | |
18bceab1 JA |
5430 | pt->error = -EINVAL; |
5431 | return; | |
5432 | } | |
ea6a693d JA |
5433 | /* |
5434 | * Can't handle multishot for double wait for now, turn it | |
5435 | * into one-shot mode. | |
5436 | */ | |
7a274727 PB |
5437 | if (!(poll_one->events & EPOLLONESHOT)) |
5438 | poll_one->events |= EPOLLONESHOT; | |
18bceab1 JA |
5439 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5440 | if (!poll) { | |
5441 | pt->error = -ENOMEM; | |
5442 | return; | |
5443 | } | |
58852d4d | 5444 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5445 | req_ref_get(req); |
18bceab1 | 5446 | poll->wait.private = req; |
d886e185 | 5447 | |
807abcb0 | 5448 | *poll_ptr = poll; |
d886e185 PB |
5449 | if (req->opcode == IORING_OP_POLL_ADD) |
5450 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
5451 | } |
5452 | ||
68b11e8b | 5453 | pt->nr_entries++; |
18bceab1 | 5454 | poll->head = head; |
a31eb4a2 JX |
5455 | |
5456 | if (poll->events & EPOLLEXCLUSIVE) | |
5457 | add_wait_queue_exclusive(head, &poll->wait); | |
5458 | else | |
5459 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5460 | } |
5461 | ||
5462 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5463 | struct poll_table_struct *p) | |
5464 | { | |
5465 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5466 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5467 | |
807abcb0 | 5468 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5469 | } |
5470 | ||
f237c30a | 5471 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
d7718a9d | 5472 | { |
d7718a9d JA |
5473 | struct async_poll *apoll = req->apoll; |
5474 | struct io_ring_ctx *ctx = req->ctx; | |
5475 | ||
236daeae | 5476 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5477 | |
74ce6ce4 | 5478 | if (io_poll_rewait(req, &apoll->poll)) { |
79ebeaee | 5479 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5480 | return; |
d7718a9d JA |
5481 | } |
5482 | ||
0ea13b44 | 5483 | hash_del(&req->hash_node); |
d4e7cd36 | 5484 | io_poll_remove_double(req); |
bd99c71b | 5485 | apoll->poll.done = true; |
79ebeaee | 5486 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5487 | |
0be0b0e3 | 5488 | if (!READ_ONCE(apoll->poll.canceled)) |
f237c30a | 5489 | io_req_task_submit(req, locked); |
0be0b0e3 | 5490 | else |
2593553a | 5491 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5492 | } |
5493 | ||
5494 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5495 | void *key) | |
5496 | { | |
5497 | struct io_kiocb *req = wait->private; | |
5498 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5499 | ||
5500 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5501 | key_to_poll(key)); | |
5502 | ||
5503 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5504 | } | |
5505 | ||
5506 | static void io_poll_req_insert(struct io_kiocb *req) | |
5507 | { | |
5508 | struct io_ring_ctx *ctx = req->ctx; | |
5509 | struct hlist_head *list; | |
5510 | ||
5511 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5512 | hlist_add_head(&req->hash_node, list); | |
5513 | } | |
5514 | ||
5515 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5516 | struct io_poll_iocb *poll, | |
5517 | struct io_poll_table *ipt, __poll_t mask, | |
5518 | wait_queue_func_t wake_func) | |
5519 | __acquires(&ctx->completion_lock) | |
5520 | { | |
5521 | struct io_ring_ctx *ctx = req->ctx; | |
5522 | bool cancel = false; | |
5523 | ||
4d52f338 | 5524 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5525 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5526 | poll->file = req->file; |
18bceab1 | 5527 | poll->wait.private = req; |
d7718a9d JA |
5528 | |
5529 | ipt->pt._key = mask; | |
5530 | ipt->req = req; | |
68b11e8b PB |
5531 | ipt->error = 0; |
5532 | ipt->nr_entries = 0; | |
d7718a9d | 5533 | |
d7718a9d | 5534 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5535 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5536 | ipt->error = -EINVAL; | |
d7718a9d | 5537 | |
79ebeaee | 5538 | spin_lock(&ctx->completion_lock); |
a890d01e | 5539 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5540 | io_poll_remove_double(req); |
d7718a9d | 5541 | if (likely(poll->head)) { |
79ebeaee | 5542 | spin_lock_irq(&poll->head->lock); |
d7718a9d JA |
5543 | if (unlikely(list_empty(&poll->wait.entry))) { |
5544 | if (ipt->error) | |
5545 | cancel = true; | |
5546 | ipt->error = 0; | |
5547 | mask = 0; | |
5548 | } | |
88e41cf9 | 5549 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5550 | list_del_init(&poll->wait.entry); |
5551 | else if (cancel) | |
5552 | WRITE_ONCE(poll->canceled, true); | |
5553 | else if (!poll->done) /* actually waiting for an event */ | |
5554 | io_poll_req_insert(req); | |
79ebeaee | 5555 | spin_unlock_irq(&poll->head->lock); |
d7718a9d JA |
5556 | } |
5557 | ||
5558 | return mask; | |
5559 | } | |
5560 | ||
59b735ae OL |
5561 | enum { |
5562 | IO_APOLL_OK, | |
5563 | IO_APOLL_ABORTED, | |
5564 | IO_APOLL_READY | |
5565 | }; | |
5566 | ||
5567 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5568 | { |
5569 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5570 | struct io_ring_ctx *ctx = req->ctx; | |
5571 | struct async_poll *apoll; | |
5572 | struct io_poll_table ipt; | |
b2d9c3da | 5573 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
d7718a9d JA |
5574 | |
5575 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5576 | return IO_APOLL_ABORTED; |
24c74678 | 5577 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5578 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5579 | if (!def->pollin && !def->pollout) |
5580 | return IO_APOLL_ABORTED; | |
5581 | ||
5582 | if (def->pollin) { | |
b2d9c3da PB |
5583 | mask |= POLLIN | POLLRDNORM; |
5584 | ||
5585 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5586 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5587 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5588 | mask &= ~POLLIN; | |
5589 | } else { | |
b2d9c3da PB |
5590 | mask |= POLLOUT | POLLWRNORM; |
5591 | } | |
5592 | ||
d7718a9d JA |
5593 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); |
5594 | if (unlikely(!apoll)) | |
59b735ae | 5595 | return IO_APOLL_ABORTED; |
807abcb0 | 5596 | apoll->double_poll = NULL; |
d7718a9d | 5597 | req->apoll = apoll; |
b2d9c3da | 5598 | req->flags |= REQ_F_POLLED; |
d7718a9d | 5599 | ipt.pt._qproc = io_async_queue_proc; |
48dcd38d | 5600 | io_req_set_refcount(req); |
d7718a9d JA |
5601 | |
5602 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5603 | io_async_wake); | |
79ebeaee | 5604 | spin_unlock(&ctx->completion_lock); |
41a5169c HX |
5605 | if (ret || ipt.error) |
5606 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5607 | ||
236daeae OL |
5608 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5609 | mask, apoll->poll.events); | |
59b735ae | 5610 | return IO_APOLL_OK; |
d7718a9d JA |
5611 | } |
5612 | ||
5613 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5614 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5615 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5616 | { |
b41e9852 | 5617 | bool do_complete = false; |
221c5eb2 | 5618 | |
5082620f JA |
5619 | if (!poll->head) |
5620 | return false; | |
79ebeaee | 5621 | spin_lock_irq(&poll->head->lock); |
b2e720ac JA |
5622 | if (do_cancel) |
5623 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5624 | if (!list_empty(&poll->wait.entry)) { |
5625 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5626 | do_complete = true; |
221c5eb2 | 5627 | } |
79ebeaee | 5628 | spin_unlock_irq(&poll->head->lock); |
3bfa5bcb | 5629 | hash_del(&req->hash_node); |
d7718a9d JA |
5630 | return do_complete; |
5631 | } | |
5632 | ||
5d709043 | 5633 | static bool io_poll_remove_one(struct io_kiocb *req) |
e07785b0 | 5634 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5635 | { |
5636 | bool do_complete; | |
5637 | ||
d4e7cd36 | 5638 | io_poll_remove_double(req); |
e31001a3 | 5639 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5640 | |
b41e9852 | 5641 | if (do_complete) { |
d4d19c19 | 5642 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5643 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5644 | req_set_fail(req); |
91c2f697 | 5645 | io_put_req_deferred(req); |
5d709043 | 5646 | } |
b41e9852 | 5647 | return do_complete; |
221c5eb2 JA |
5648 | } |
5649 | ||
76e1b642 JA |
5650 | /* |
5651 | * Returns true if we found and killed one or more poll requests | |
5652 | */ | |
c072481d PB |
5653 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
5654 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 5655 | { |
78076bb6 | 5656 | struct hlist_node *tmp; |
221c5eb2 | 5657 | struct io_kiocb *req; |
8e2e1faf | 5658 | int posted = 0, i; |
221c5eb2 | 5659 | |
79ebeaee | 5660 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5661 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5662 | struct hlist_head *list; | |
5663 | ||
5664 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5665 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5666 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5667 | posted += io_poll_remove_one(req); |
5668 | } | |
221c5eb2 | 5669 | } |
79ebeaee | 5670 | spin_unlock(&ctx->completion_lock); |
b41e9852 | 5671 | |
8e2e1faf JA |
5672 | if (posted) |
5673 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5674 | |
5675 | return posted != 0; | |
221c5eb2 JA |
5676 | } |
5677 | ||
9ba5fac8 PB |
5678 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5679 | bool poll_only) | |
e07785b0 | 5680 | __must_hold(&ctx->completion_lock) |
47f46768 | 5681 | { |
78076bb6 | 5682 | struct hlist_head *list; |
47f46768 JA |
5683 | struct io_kiocb *req; |
5684 | ||
78076bb6 JA |
5685 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5686 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5687 | if (sqe_addr != req->user_data) |
5688 | continue; | |
9ba5fac8 PB |
5689 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5690 | continue; | |
b2cb805f | 5691 | return req; |
47f46768 | 5692 | } |
b2cb805f JA |
5693 | return NULL; |
5694 | } | |
5695 | ||
9ba5fac8 PB |
5696 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5697 | bool poll_only) | |
e07785b0 | 5698 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5699 | { |
5700 | struct io_kiocb *req; | |
5701 | ||
9ba5fac8 | 5702 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5703 | if (!req) |
5704 | return -ENOENT; | |
5705 | if (io_poll_remove_one(req)) | |
5706 | return 0; | |
5707 | ||
5708 | return -EALREADY; | |
47f46768 JA |
5709 | } |
5710 | ||
9096af3e PB |
5711 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5712 | unsigned int flags) | |
5713 | { | |
5714 | u32 events; | |
47f46768 | 5715 | |
9096af3e PB |
5716 | events = READ_ONCE(sqe->poll32_events); |
5717 | #ifdef __BIG_ENDIAN | |
5718 | events = swahw32(events); | |
5719 | #endif | |
5720 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5721 | events |= EPOLLONESHOT; | |
5722 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5723 | } |
5724 | ||
c5de0036 | 5725 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5726 | const struct io_uring_sqe *sqe) |
0969e783 | 5727 | { |
c5de0036 PB |
5728 | struct io_poll_update *upd = &req->poll_update; |
5729 | u32 flags; | |
5730 | ||
0969e783 JA |
5731 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5732 | return -EINVAL; | |
26578cda | 5733 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5734 | return -EINVAL; |
5735 | flags = READ_ONCE(sqe->len); | |
5736 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5737 | IORING_POLL_ADD_MULTI)) | |
5738 | return -EINVAL; | |
5739 | /* meaningless without update */ | |
5740 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5741 | return -EINVAL; |
5742 | ||
c5de0036 PB |
5743 | upd->old_user_data = READ_ONCE(sqe->addr); |
5744 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5745 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5746 | |
c5de0036 PB |
5747 | upd->new_user_data = READ_ONCE(sqe->off); |
5748 | if (!upd->update_user_data && upd->new_user_data) | |
5749 | return -EINVAL; | |
5750 | if (upd->update_events) | |
5751 | upd->events = io_poll_parse_events(sqe, flags); | |
5752 | else if (sqe->poll32_events) | |
5753 | return -EINVAL; | |
221c5eb2 | 5754 | |
221c5eb2 JA |
5755 | return 0; |
5756 | } | |
5757 | ||
221c5eb2 JA |
5758 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5759 | void *key) | |
5760 | { | |
c2f2eb7d JA |
5761 | struct io_kiocb *req = wait->private; |
5762 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5763 | |
d7718a9d | 5764 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5765 | } |
5766 | ||
221c5eb2 JA |
5767 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5768 | struct poll_table_struct *p) | |
5769 | { | |
5770 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5771 | ||
e8c2bc1f | 5772 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5773 | } |
5774 | ||
3529d8c2 | 5775 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5776 | { |
5777 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5778 | u32 flags; |
221c5eb2 JA |
5779 | |
5780 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5781 | return -EINVAL; | |
c5de0036 | 5782 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5783 | return -EINVAL; |
5784 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5785 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5786 | return -EINVAL; |
5787 | ||
48dcd38d | 5788 | io_req_set_refcount(req); |
c5de0036 | 5789 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5790 | return 0; |
5791 | } | |
5792 | ||
61e98203 | 5793 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5794 | { |
5795 | struct io_poll_iocb *poll = &req->poll; | |
5796 | struct io_ring_ctx *ctx = req->ctx; | |
5797 | struct io_poll_table ipt; | |
0969e783 | 5798 | __poll_t mask; |
5b7aa38d | 5799 | bool done; |
0969e783 | 5800 | |
d7718a9d | 5801 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5802 | |
d7718a9d JA |
5803 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5804 | io_poll_wake); | |
221c5eb2 | 5805 | |
8c838788 | 5806 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5807 | ipt.error = 0; |
eb6e6f06 PB |
5808 | done = __io_poll_complete(req, mask); |
5809 | io_commit_cqring(req->ctx); | |
221c5eb2 | 5810 | } |
79ebeaee | 5811 | spin_unlock(&ctx->completion_lock); |
221c5eb2 | 5812 | |
8c838788 JA |
5813 | if (mask) { |
5814 | io_cqring_ev_posted(ctx); | |
5b7aa38d | 5815 | if (done) |
88e41cf9 | 5816 | io_put_req(req); |
221c5eb2 | 5817 | } |
8c838788 | 5818 | return ipt.error; |
221c5eb2 JA |
5819 | } |
5820 | ||
c5de0036 | 5821 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5822 | { |
5823 | struct io_ring_ctx *ctx = req->ctx; | |
5824 | struct io_kiocb *preq; | |
cb3b200e | 5825 | bool completing; |
b69de288 JA |
5826 | int ret; |
5827 | ||
79ebeaee | 5828 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5829 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5830 | if (!preq) { |
5831 | ret = -ENOENT; | |
5832 | goto err; | |
b69de288 | 5833 | } |
cb3b200e | 5834 | |
c5de0036 PB |
5835 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5836 | completing = true; | |
5837 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5838 | goto err; | |
5839 | } | |
5840 | ||
cb3b200e JA |
5841 | /* |
5842 | * Don't allow racy completion with singleshot, as we cannot safely | |
5843 | * update those. For multishot, if we're racing with completion, just | |
5844 | * let completion re-add it. | |
5845 | */ | |
5846 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5847 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5848 | ret = -EALREADY; | |
5849 | goto err; | |
b69de288 JA |
5850 | } |
5851 | /* we now have a detached poll request. reissue. */ | |
5852 | ret = 0; | |
5853 | err: | |
b69de288 | 5854 | if (ret < 0) { |
79ebeaee | 5855 | spin_unlock(&ctx->completion_lock); |
93d2bcd2 | 5856 | req_set_fail(req); |
b69de288 JA |
5857 | io_req_complete(req, ret); |
5858 | return 0; | |
5859 | } | |
5860 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5861 | if (req->poll_update.update_events) { |
b69de288 | 5862 | preq->poll.events &= ~0xffff; |
9d805892 | 5863 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5864 | preq->poll.events |= IO_POLL_UNMASK; |
5865 | } | |
9d805892 PB |
5866 | if (req->poll_update.update_user_data) |
5867 | preq->user_data = req->poll_update.new_user_data; | |
79ebeaee | 5868 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5869 | |
b69de288 JA |
5870 | /* complete update request, we're done with it */ |
5871 | io_req_complete(req, ret); | |
5872 | ||
cb3b200e | 5873 | if (!completing) { |
c5de0036 | 5874 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5875 | if (ret < 0) { |
93d2bcd2 | 5876 | req_set_fail(preq); |
cb3b200e JA |
5877 | io_req_complete(preq, ret); |
5878 | } | |
b69de288 JA |
5879 | } |
5880 | return 0; | |
5881 | } | |
5882 | ||
f237c30a | 5883 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
89850fce | 5884 | { |
6224590d PB |
5885 | struct io_timeout_data *data = req->async_data; |
5886 | ||
5887 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) | |
5888 | req_set_fail(req); | |
505657bc | 5889 | io_req_complete_post(req, -ETIME, 0); |
89850fce JA |
5890 | } |
5891 | ||
5262f567 JA |
5892 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5893 | { | |
ad8a48ac JA |
5894 | struct io_timeout_data *data = container_of(timer, |
5895 | struct io_timeout_data, timer); | |
5896 | struct io_kiocb *req = data->req; | |
5897 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5898 | unsigned long flags; |
5899 | ||
89850fce | 5900 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5901 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5902 | atomic_set(&req->ctx->cq_timeouts, |
5903 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5904 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5905 | |
89850fce JA |
5906 | req->io_task_work.func = io_req_task_timeout; |
5907 | io_req_task_work_add(req); | |
5262f567 JA |
5908 | return HRTIMER_NORESTART; |
5909 | } | |
5910 | ||
fbd15848 PB |
5911 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5912 | __u64 user_data) | |
89850fce | 5913 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5914 | { |
fbd15848 | 5915 | struct io_timeout_data *io; |
47f46768 | 5916 | struct io_kiocb *req; |
fd9c7bc5 | 5917 | bool found = false; |
f254ac04 | 5918 | |
135fcde8 | 5919 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5920 | found = user_data == req->user_data; |
5921 | if (found) | |
47f46768 | 5922 | break; |
47f46768 | 5923 | } |
fd9c7bc5 PB |
5924 | if (!found) |
5925 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5926 | |
5927 | io = req->async_data; | |
fd9c7bc5 | 5928 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5929 | return ERR_PTR(-EALREADY); |
a71976f3 | 5930 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5931 | return req; |
5932 | } | |
47f46768 | 5933 | |
fbd15848 | 5934 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 5935 | __must_hold(&ctx->completion_lock) |
89850fce | 5936 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
5937 | { |
5938 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5939 | ||
5940 | if (IS_ERR(req)) | |
5941 | return PTR_ERR(req); | |
f254ac04 | 5942 | |
93d2bcd2 | 5943 | req_set_fail(req); |
d4d19c19 | 5944 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
91c2f697 | 5945 | io_put_req_deferred(req); |
f254ac04 JA |
5946 | return 0; |
5947 | } | |
5948 | ||
50c1df2b JA |
5949 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
5950 | { | |
5951 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
5952 | case IORING_TIMEOUT_BOOTTIME: | |
5953 | return CLOCK_BOOTTIME; | |
5954 | case IORING_TIMEOUT_REALTIME: | |
5955 | return CLOCK_REALTIME; | |
5956 | default: | |
5957 | /* can't happen, vetted at prep time */ | |
5958 | WARN_ON_ONCE(1); | |
5959 | fallthrough; | |
5960 | case 0: | |
5961 | return CLOCK_MONOTONIC; | |
5962 | } | |
5963 | } | |
5964 | ||
f1042b6c PB |
5965 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5966 | struct timespec64 *ts, enum hrtimer_mode mode) | |
5967 | __must_hold(&ctx->timeout_lock) | |
5968 | { | |
5969 | struct io_timeout_data *io; | |
5970 | struct io_kiocb *req; | |
5971 | bool found = false; | |
5972 | ||
5973 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
5974 | found = user_data == req->user_data; | |
5975 | if (found) | |
5976 | break; | |
5977 | } | |
5978 | if (!found) | |
5979 | return -ENOENT; | |
5980 | ||
5981 | io = req->async_data; | |
5982 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
5983 | return -EALREADY; | |
5984 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
5985 | io->timer.function = io_link_timeout_fn; | |
5986 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
5987 | return 0; | |
5988 | } | |
5989 | ||
9c8e11b3 PB |
5990 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5991 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 5992 | __must_hold(&ctx->timeout_lock) |
47f46768 | 5993 | { |
9c8e11b3 PB |
5994 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5995 | struct io_timeout_data *data; | |
47f46768 | 5996 | |
9c8e11b3 PB |
5997 | if (IS_ERR(req)) |
5998 | return PTR_ERR(req); | |
47f46768 | 5999 | |
9c8e11b3 PB |
6000 | req->timeout.off = 0; /* noseq */ |
6001 | data = req->async_data; | |
6002 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6003 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6004 | data->timer.function = io_timeout_fn; |
6005 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6006 | return 0; | |
47f46768 JA |
6007 | } |
6008 | ||
3529d8c2 JA |
6009 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6010 | const struct io_uring_sqe *sqe) | |
b29472ee | 6011 | { |
9c8e11b3 PB |
6012 | struct io_timeout_rem *tr = &req->timeout_rem; |
6013 | ||
b29472ee JA |
6014 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6015 | return -EINVAL; | |
61710e43 DA |
6016 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6017 | return -EINVAL; | |
26578cda | 6018 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6019 | return -EINVAL; |
6020 | ||
f1042b6c | 6021 | tr->ltimeout = false; |
9c8e11b3 PB |
6022 | tr->addr = READ_ONCE(sqe->addr); |
6023 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6024 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6025 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6026 | return -EINVAL; | |
6027 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6028 | tr->ltimeout = true; | |
6029 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6030 | return -EINVAL; |
6031 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6032 | return -EFAULT; | |
6033 | } else if (tr->flags) { | |
6034 | /* timeout removal doesn't support flags */ | |
b29472ee | 6035 | return -EINVAL; |
9c8e11b3 | 6036 | } |
b29472ee | 6037 | |
b29472ee JA |
6038 | return 0; |
6039 | } | |
6040 | ||
8662daec PB |
6041 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6042 | { | |
6043 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6044 | : HRTIMER_MODE_REL; | |
6045 | } | |
6046 | ||
11365043 JA |
6047 | /* |
6048 | * Remove or update an existing timeout command | |
6049 | */ | |
61e98203 | 6050 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6051 | { |
9c8e11b3 | 6052 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6053 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6054 | int ret; |
11365043 | 6055 | |
ec3c3d0f PB |
6056 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6057 | spin_lock(&ctx->completion_lock); | |
6058 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6059 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6060 | spin_unlock_irq(&ctx->timeout_lock); |
6061 | spin_unlock(&ctx->completion_lock); | |
6062 | } else { | |
f1042b6c PB |
6063 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6064 | ||
ec3c3d0f | 6065 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6066 | if (tr->ltimeout) |
6067 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6068 | else | |
6069 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6070 | spin_unlock_irq(&ctx->timeout_lock); |
6071 | } | |
11365043 | 6072 | |
4e88d6e7 | 6073 | if (ret < 0) |
93d2bcd2 | 6074 | req_set_fail(req); |
505657bc | 6075 | io_req_complete_post(req, ret, 0); |
11365043 | 6076 | return 0; |
5262f567 JA |
6077 | } |
6078 | ||
3529d8c2 | 6079 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6080 | bool is_timeout_link) |
5262f567 | 6081 | { |
ad8a48ac | 6082 | struct io_timeout_data *data; |
a41525ab | 6083 | unsigned flags; |
56080b02 | 6084 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6085 | |
ad8a48ac | 6086 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6087 | return -EINVAL; |
26578cda PB |
6088 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6089 | sqe->splice_fd_in) | |
a41525ab | 6090 | return -EINVAL; |
56080b02 | 6091 | if (off && is_timeout_link) |
2d28390a | 6092 | return -EINVAL; |
a41525ab | 6093 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
6094 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
6095 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
6096 | return -EINVAL; |
6097 | /* more than one clock specified is invalid, obviously */ | |
6098 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6099 | return -EINVAL; |
bdf20073 | 6100 | |
ef9dd637 | 6101 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6102 | req->timeout.off = off; |
f18ee4cf PB |
6103 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6104 | req->ctx->off_timeout_used = true; | |
26a61679 | 6105 | |
d886e185 | 6106 | if (!req_has_async_data(req) && io_alloc_async_data(req)) |
26a61679 JA |
6107 | return -ENOMEM; |
6108 | ||
e8c2bc1f | 6109 | data = req->async_data; |
ad8a48ac | 6110 | data->req = req; |
50c1df2b | 6111 | data->flags = flags; |
ad8a48ac JA |
6112 | |
6113 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6114 | return -EFAULT; |
6115 | ||
8662daec | 6116 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6117 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6118 | |
6119 | if (is_timeout_link) { | |
6120 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6121 | ||
6122 | if (!link->head) | |
6123 | return -EINVAL; | |
6124 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6125 | return -EINVAL; | |
4d13d1a4 PB |
6126 | req->timeout.head = link->last; |
6127 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6128 | } |
ad8a48ac JA |
6129 | return 0; |
6130 | } | |
6131 | ||
61e98203 | 6132 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6133 | { |
ad8a48ac | 6134 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6135 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6136 | struct list_head *entry; |
bfe68a22 | 6137 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6138 | |
89850fce | 6139 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6140 | |
5262f567 JA |
6141 | /* |
6142 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6143 | * timeout event to be satisfied. If it isn't set, then this is |
6144 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6145 | */ |
8eb7e2d0 | 6146 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6147 | entry = ctx->timeout_list.prev; |
6148 | goto add; | |
6149 | } | |
5262f567 | 6150 | |
bfe68a22 PB |
6151 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6152 | req->timeout.target_seq = tail + off; | |
5262f567 | 6153 | |
f010505b MDG |
6154 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6155 | * This is safe because ->completion_lock is held, and submissions | |
6156 | * and completions are never mixed in the same ->completion_lock section. | |
6157 | */ | |
6158 | ctx->cq_last_tm_flush = tail; | |
6159 | ||
5262f567 JA |
6160 | /* |
6161 | * Insertion sort, ensuring the first entry in the list is always | |
6162 | * the one we need first. | |
6163 | */ | |
5262f567 | 6164 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6165 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6166 | timeout.list); | |
5262f567 | 6167 | |
8eb7e2d0 | 6168 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6169 | continue; |
bfe68a22 PB |
6170 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6171 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6172 | break; |
6173 | } | |
93bd25bb | 6174 | add: |
135fcde8 | 6175 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6176 | data->timer.function = io_timeout_fn; |
6177 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6178 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6179 | return 0; |
6180 | } | |
5262f567 | 6181 | |
f458dd84 PB |
6182 | struct io_cancel_data { |
6183 | struct io_ring_ctx *ctx; | |
6184 | u64 user_data; | |
6185 | }; | |
6186 | ||
62755e35 JA |
6187 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6188 | { | |
6189 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6190 | struct io_cancel_data *cd = data; |
62755e35 | 6191 | |
f458dd84 | 6192 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6193 | } |
6194 | ||
f458dd84 PB |
6195 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6196 | struct io_ring_ctx *ctx) | |
62755e35 | 6197 | { |
f458dd84 | 6198 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6199 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6200 | int ret = 0; |
6201 | ||
f458dd84 | 6202 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6203 | return -ENOENT; |
6204 | ||
f458dd84 | 6205 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6206 | switch (cancel_ret) { |
6207 | case IO_WQ_CANCEL_OK: | |
6208 | ret = 0; | |
6209 | break; | |
6210 | case IO_WQ_CANCEL_RUNNING: | |
6211 | ret = -EALREADY; | |
6212 | break; | |
6213 | case IO_WQ_CANCEL_NOTFOUND: | |
6214 | ret = -ENOENT; | |
6215 | break; | |
6216 | } | |
6217 | ||
e977d6d3 JA |
6218 | return ret; |
6219 | } | |
6220 | ||
8cb01fac | 6221 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6222 | { |
8cb01fac | 6223 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6224 | int ret; |
6225 | ||
dadebc35 | 6226 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6227 | |
f458dd84 | 6228 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6229 | if (ret != -ENOENT) |
8cb01fac | 6230 | return ret; |
505657bc PB |
6231 | |
6232 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6233 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6234 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6235 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6236 | if (ret != -ENOENT) |
505657bc PB |
6237 | goto out; |
6238 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6239 | out: | |
6240 | spin_unlock(&ctx->completion_lock); | |
6241 | return ret; | |
47f46768 JA |
6242 | } |
6243 | ||
3529d8c2 JA |
6244 | static int io_async_cancel_prep(struct io_kiocb *req, |
6245 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6246 | { |
fbf23849 | 6247 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6248 | return -EINVAL; |
61710e43 DA |
6249 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6250 | return -EINVAL; | |
26578cda PB |
6251 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6252 | sqe->splice_fd_in) | |
e977d6d3 JA |
6253 | return -EINVAL; |
6254 | ||
fbf23849 JA |
6255 | req->cancel.addr = READ_ONCE(sqe->addr); |
6256 | return 0; | |
6257 | } | |
6258 | ||
61e98203 | 6259 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6260 | { |
6261 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
6262 | u64 sqe_addr = req->cancel.addr; |
6263 | struct io_tctx_node *node; | |
6264 | int ret; | |
6265 | ||
8cb01fac | 6266 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6267 | if (ret != -ENOENT) |
6268 | goto done; | |
58f99373 PB |
6269 | |
6270 | /* slow path, try all io-wq's */ | |
6271 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
6272 | ret = -ENOENT; | |
6273 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6274 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6275 | |
58f99373 PB |
6276 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6277 | if (ret != -ENOENT) | |
6278 | break; | |
6279 | } | |
6280 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
58f99373 | 6281 | done: |
58f99373 | 6282 | if (ret < 0) |
93d2bcd2 | 6283 | req_set_fail(req); |
505657bc | 6284 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6285 | return 0; |
6286 | } | |
6287 | ||
269bbe5f | 6288 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6289 | const struct io_uring_sqe *sqe) |
6290 | { | |
61710e43 DA |
6291 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6292 | return -EINVAL; | |
26578cda | 6293 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6294 | return -EINVAL; |
6295 | ||
269bbe5f BM |
6296 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6297 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6298 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6299 | return -EINVAL; |
269bbe5f | 6300 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6301 | return 0; |
6302 | } | |
6303 | ||
889fca73 | 6304 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6305 | { |
6306 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 6307 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6308 | int ret; |
fbf23849 | 6309 | |
269bbe5f BM |
6310 | up.offset = req->rsrc_update.offset; |
6311 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6312 | up.nr = 0; |
6313 | up.tags = 0; | |
615cee49 | 6314 | up.resv = 0; |
05f3fb3c | 6315 | |
cdb31c29 | 6316 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
fdecb662 | 6317 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6318 | &up, req->rsrc_update.nr_args); |
cdb31c29 | 6319 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
05f3fb3c JA |
6320 | |
6321 | if (ret < 0) | |
93d2bcd2 | 6322 | req_set_fail(req); |
889fca73 | 6323 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6324 | return 0; |
6325 | } | |
6326 | ||
bfe76559 | 6327 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6328 | { |
d625c6ee | 6329 | switch (req->opcode) { |
e781573e | 6330 | case IORING_OP_NOP: |
bfe76559 | 6331 | return 0; |
f67676d1 JA |
6332 | case IORING_OP_READV: |
6333 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6334 | case IORING_OP_READ: |
bfe76559 | 6335 | return io_read_prep(req, sqe); |
f67676d1 JA |
6336 | case IORING_OP_WRITEV: |
6337 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6338 | case IORING_OP_WRITE: |
bfe76559 | 6339 | return io_write_prep(req, sqe); |
0969e783 | 6340 | case IORING_OP_POLL_ADD: |
bfe76559 | 6341 | return io_poll_add_prep(req, sqe); |
0969e783 | 6342 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6343 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6344 | case IORING_OP_FSYNC: |
1155c76a | 6345 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6346 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6347 | return io_sfr_prep(req, sqe); |
03b1230c | 6348 | case IORING_OP_SENDMSG: |
fddaface | 6349 | case IORING_OP_SEND: |
bfe76559 | 6350 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6351 | case IORING_OP_RECVMSG: |
fddaface | 6352 | case IORING_OP_RECV: |
bfe76559 | 6353 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6354 | case IORING_OP_CONNECT: |
bfe76559 | 6355 | return io_connect_prep(req, sqe); |
2d28390a | 6356 | case IORING_OP_TIMEOUT: |
bfe76559 | 6357 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6358 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6359 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6360 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6361 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6362 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6363 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6364 | case IORING_OP_ACCEPT: |
bfe76559 | 6365 | return io_accept_prep(req, sqe); |
d63d1b5e | 6366 | case IORING_OP_FALLOCATE: |
bfe76559 | 6367 | return io_fallocate_prep(req, sqe); |
15b71abe | 6368 | case IORING_OP_OPENAT: |
bfe76559 | 6369 | return io_openat_prep(req, sqe); |
b5dba59e | 6370 | case IORING_OP_CLOSE: |
bfe76559 | 6371 | return io_close_prep(req, sqe); |
05f3fb3c | 6372 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6373 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6374 | case IORING_OP_STATX: |
bfe76559 | 6375 | return io_statx_prep(req, sqe); |
4840e418 | 6376 | case IORING_OP_FADVISE: |
bfe76559 | 6377 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6378 | case IORING_OP_MADVISE: |
bfe76559 | 6379 | return io_madvise_prep(req, sqe); |
cebdb986 | 6380 | case IORING_OP_OPENAT2: |
bfe76559 | 6381 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6382 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6383 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6384 | case IORING_OP_SPLICE: |
bfe76559 | 6385 | return io_splice_prep(req, sqe); |
ddf0322d | 6386 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6387 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6388 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6389 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6390 | case IORING_OP_TEE: |
bfe76559 | 6391 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6392 | case IORING_OP_SHUTDOWN: |
6393 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6394 | case IORING_OP_RENAMEAT: |
6395 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6396 | case IORING_OP_UNLINKAT: |
6397 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6398 | case IORING_OP_MKDIRAT: |
6399 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6400 | case IORING_OP_SYMLINKAT: |
6401 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6402 | case IORING_OP_LINKAT: |
6403 | return io_linkat_prep(req, sqe); | |
f67676d1 JA |
6404 | } |
6405 | ||
bfe76559 PB |
6406 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6407 | req->opcode); | |
bd54b6fe | 6408 | return -EINVAL; |
bfe76559 PB |
6409 | } |
6410 | ||
93642ef8 | 6411 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6412 | { |
b7e298d2 PB |
6413 | if (!io_op_defs[req->opcode].needs_async_setup) |
6414 | return 0; | |
d886e185 | 6415 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
6416 | return -EFAULT; |
6417 | if (io_alloc_async_data(req)) | |
6418 | return -EAGAIN; | |
6419 | ||
93642ef8 PB |
6420 | switch (req->opcode) { |
6421 | case IORING_OP_READV: | |
93642ef8 PB |
6422 | return io_rw_prep_async(req, READ); |
6423 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6424 | return io_rw_prep_async(req, WRITE); |
6425 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6426 | return io_sendmsg_prep_async(req); |
6427 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6428 | return io_recvmsg_prep_async(req); |
6429 | case IORING_OP_CONNECT: | |
6430 | return io_connect_prep_async(req); | |
6431 | } | |
b7e298d2 PB |
6432 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6433 | req->opcode); | |
6434 | return -EFAULT; | |
f67676d1 JA |
6435 | } |
6436 | ||
9cf7c104 PB |
6437 | static u32 io_get_sequence(struct io_kiocb *req) |
6438 | { | |
a3dbdf54 | 6439 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6440 | |
a3dbdf54 PB |
6441 | /* need original cached_sq_head, but it was increased for each req */ |
6442 | io_for_each_link(req, req) | |
6443 | seq--; | |
6444 | return seq; | |
9cf7c104 PB |
6445 | } |
6446 | ||
c072481d | 6447 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 6448 | { |
a197f664 | 6449 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6450 | struct io_defer_entry *de; |
f67676d1 | 6451 | int ret; |
e0eb71dc | 6452 | u32 seq = io_get_sequence(req); |
de0617e4 | 6453 | |
9d858b21 | 6454 | /* Still need defer if there is pending req in defer list. */ |
5e371265 | 6455 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e0eb71dc | 6456 | queue: |
5e371265 | 6457 | ctx->drain_active = false; |
e0eb71dc PB |
6458 | io_req_task_queue(req); |
6459 | return; | |
5e371265 | 6460 | } |
de0617e4 | 6461 | |
b7e298d2 | 6462 | ret = io_req_prep_async(req); |
e0eb71dc PB |
6463 | if (ret) { |
6464 | fail: | |
6465 | io_req_complete_failed(req, ret); | |
6466 | return; | |
6467 | } | |
cbdcb435 | 6468 | io_prep_async_link(req); |
27dc8338 | 6469 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6470 | if (!de) { |
1b48773f | 6471 | ret = -ENOMEM; |
e0eb71dc | 6472 | goto fail; |
76cc33d7 | 6473 | } |
2d28390a | 6474 | |
79ebeaee | 6475 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6476 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6477 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6478 | kfree(de); |
e0eb71dc | 6479 | goto queue; |
de0617e4 JA |
6480 | } |
6481 | ||
915967f6 | 6482 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6483 | de->req = req; |
9cf7c104 | 6484 | de->seq = seq; |
27dc8338 | 6485 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6486 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
6487 | } |
6488 | ||
68fb8979 | 6489 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6490 | { |
0e1b6fe3 | 6491 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 PB |
6492 | kfree(req->kbuf); |
6493 | req->kbuf = NULL; | |
99bc4c38 PB |
6494 | } |
6495 | ||
0e1b6fe3 PB |
6496 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6497 | switch (req->opcode) { | |
6498 | case IORING_OP_READV: | |
6499 | case IORING_OP_READ_FIXED: | |
6500 | case IORING_OP_READ: | |
6501 | case IORING_OP_WRITEV: | |
6502 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6503 | case IORING_OP_WRITE: { |
6504 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6505 | |
6506 | kfree(io->free_iovec); | |
0e1b6fe3 | 6507 | break; |
e8c2bc1f | 6508 | } |
0e1b6fe3 | 6509 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6510 | case IORING_OP_SENDMSG: { |
6511 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6512 | |
6513 | kfree(io->free_iov); | |
0e1b6fe3 | 6514 | break; |
e8c2bc1f | 6515 | } |
0e1b6fe3 PB |
6516 | case IORING_OP_SPLICE: |
6517 | case IORING_OP_TEE: | |
e1d767f0 PB |
6518 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6519 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6520 | break; |
f3cd4850 JA |
6521 | case IORING_OP_OPENAT: |
6522 | case IORING_OP_OPENAT2: | |
6523 | if (req->open.filename) | |
6524 | putname(req->open.filename); | |
6525 | break; | |
80a261fd JA |
6526 | case IORING_OP_RENAMEAT: |
6527 | putname(req->rename.oldpath); | |
6528 | putname(req->rename.newpath); | |
6529 | break; | |
14a1143b JA |
6530 | case IORING_OP_UNLINKAT: |
6531 | putname(req->unlink.filename); | |
6532 | break; | |
e34a02dc DK |
6533 | case IORING_OP_MKDIRAT: |
6534 | putname(req->mkdir.filename); | |
6535 | break; | |
7a8721f8 DK |
6536 | case IORING_OP_SYMLINKAT: |
6537 | putname(req->symlink.oldpath); | |
6538 | putname(req->symlink.newpath); | |
6539 | break; | |
cf30da90 DK |
6540 | case IORING_OP_LINKAT: |
6541 | putname(req->hardlink.oldpath); | |
6542 | putname(req->hardlink.newpath); | |
6543 | break; | |
0e1b6fe3 | 6544 | } |
99bc4c38 | 6545 | } |
75652a30 JA |
6546 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6547 | kfree(req->apoll->double_poll); | |
6548 | kfree(req->apoll); | |
6549 | req->apoll = NULL; | |
6550 | } | |
3a0a6902 PB |
6551 | if (req->flags & REQ_F_INFLIGHT) { |
6552 | struct io_uring_task *tctx = req->task->io_uring; | |
6553 | ||
6554 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6555 | } |
c854357b | 6556 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6557 | put_cred(req->creds); |
d886e185 PB |
6558 | if (req->flags & REQ_F_ASYNC_DATA) { |
6559 | kfree(req->async_data); | |
6560 | req->async_data = NULL; | |
6561 | } | |
c854357b | 6562 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
6563 | } |
6564 | ||
889fca73 | 6565 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6566 | { |
5730b27e | 6567 | const struct cred *creds = NULL; |
d625c6ee | 6568 | int ret; |
2b188cc1 | 6569 | |
6878b40e | 6570 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 6571 | creds = override_creds(req->creds); |
5730b27e | 6572 | |
d625c6ee | 6573 | switch (req->opcode) { |
2b188cc1 | 6574 | case IORING_OP_NOP: |
889fca73 | 6575 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6576 | break; |
6577 | case IORING_OP_READV: | |
edafccee | 6578 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6579 | case IORING_OP_READ: |
889fca73 | 6580 | ret = io_read(req, issue_flags); |
edafccee | 6581 | break; |
3529d8c2 | 6582 | case IORING_OP_WRITEV: |
edafccee | 6583 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6584 | case IORING_OP_WRITE: |
889fca73 | 6585 | ret = io_write(req, issue_flags); |
2b188cc1 | 6586 | break; |
c992fe29 | 6587 | case IORING_OP_FSYNC: |
45d189c6 | 6588 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6589 | break; |
221c5eb2 | 6590 | case IORING_OP_POLL_ADD: |
61e98203 | 6591 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6592 | break; |
6593 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6594 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6595 | break; |
5d17b4a4 | 6596 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6597 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6598 | break; |
0fa03c62 | 6599 | case IORING_OP_SENDMSG: |
889fca73 | 6600 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6601 | break; |
fddaface | 6602 | case IORING_OP_SEND: |
889fca73 | 6603 | ret = io_send(req, issue_flags); |
0fa03c62 | 6604 | break; |
aa1fa28f | 6605 | case IORING_OP_RECVMSG: |
889fca73 | 6606 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6607 | break; |
fddaface | 6608 | case IORING_OP_RECV: |
889fca73 | 6609 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6610 | break; |
5262f567 | 6611 | case IORING_OP_TIMEOUT: |
61e98203 | 6612 | ret = io_timeout(req, issue_flags); |
5262f567 | 6613 | break; |
11365043 | 6614 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6615 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6616 | break; |
17f2fe35 | 6617 | case IORING_OP_ACCEPT: |
889fca73 | 6618 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6619 | break; |
f8e85cf2 | 6620 | case IORING_OP_CONNECT: |
889fca73 | 6621 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6622 | break; |
62755e35 | 6623 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6624 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6625 | break; |
d63d1b5e | 6626 | case IORING_OP_FALLOCATE: |
45d189c6 | 6627 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6628 | break; |
15b71abe | 6629 | case IORING_OP_OPENAT: |
45d189c6 | 6630 | ret = io_openat(req, issue_flags); |
15b71abe | 6631 | break; |
b5dba59e | 6632 | case IORING_OP_CLOSE: |
889fca73 | 6633 | ret = io_close(req, issue_flags); |
b5dba59e | 6634 | break; |
05f3fb3c | 6635 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6636 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6637 | break; |
eddc7ef5 | 6638 | case IORING_OP_STATX: |
45d189c6 | 6639 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6640 | break; |
4840e418 | 6641 | case IORING_OP_FADVISE: |
45d189c6 | 6642 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6643 | break; |
c1ca757b | 6644 | case IORING_OP_MADVISE: |
45d189c6 | 6645 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6646 | break; |
cebdb986 | 6647 | case IORING_OP_OPENAT2: |
45d189c6 | 6648 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6649 | break; |
3e4827b0 | 6650 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6651 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6652 | break; |
7d67af2c | 6653 | case IORING_OP_SPLICE: |
45d189c6 | 6654 | ret = io_splice(req, issue_flags); |
7d67af2c | 6655 | break; |
ddf0322d | 6656 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6657 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6658 | break; |
067524e9 | 6659 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6660 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6661 | break; |
f2a8d5c7 | 6662 | case IORING_OP_TEE: |
45d189c6 | 6663 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6664 | break; |
36f4fa68 | 6665 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6666 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6667 | break; |
80a261fd | 6668 | case IORING_OP_RENAMEAT: |
45d189c6 | 6669 | ret = io_renameat(req, issue_flags); |
80a261fd | 6670 | break; |
14a1143b | 6671 | case IORING_OP_UNLINKAT: |
45d189c6 | 6672 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6673 | break; |
e34a02dc DK |
6674 | case IORING_OP_MKDIRAT: |
6675 | ret = io_mkdirat(req, issue_flags); | |
6676 | break; | |
7a8721f8 DK |
6677 | case IORING_OP_SYMLINKAT: |
6678 | ret = io_symlinkat(req, issue_flags); | |
6679 | break; | |
cf30da90 DK |
6680 | case IORING_OP_LINKAT: |
6681 | ret = io_linkat(req, issue_flags); | |
6682 | break; | |
2b188cc1 JA |
6683 | default: |
6684 | ret = -EINVAL; | |
6685 | break; | |
6686 | } | |
6687 | ||
5730b27e JA |
6688 | if (creds) |
6689 | revert_creds(creds); | |
def596e9 JA |
6690 | if (ret) |
6691 | return ret; | |
b532576e | 6692 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 6693 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 6694 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
6695 | |
6696 | return 0; | |
2b188cc1 JA |
6697 | } |
6698 | ||
ebc11b6c PB |
6699 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6700 | { | |
6701 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6702 | ||
6703 | req = io_put_req_find_next(req); | |
6704 | return req ? &req->work : NULL; | |
6705 | } | |
6706 | ||
5280f7e5 | 6707 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6708 | { |
6709 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6710 | struct io_kiocb *timeout; |
561fb04a | 6711 | int ret = 0; |
2b188cc1 | 6712 | |
48dcd38d PB |
6713 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6714 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6715 | __io_req_set_refcount(req, 2); | |
6716 | else | |
6717 | req_ref_get(req); | |
5d5901a3 | 6718 | |
6df1db6b PB |
6719 | timeout = io_prep_linked_timeout(req); |
6720 | if (timeout) | |
6721 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6722 | |
dadebc35 | 6723 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
4014d943 | 6724 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6725 | ret = -ECANCELED; |
31b51510 | 6726 | |
561fb04a | 6727 | if (!ret) { |
561fb04a | 6728 | do { |
889fca73 | 6729 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6730 | /* |
6731 | * We can get EAGAIN for polled IO even though we're | |
6732 | * forcing a sync submission from here, since we can't | |
6733 | * wait for request slots on the block side. | |
6734 | */ | |
6735 | if (ret != -EAGAIN) | |
6736 | break; | |
6737 | cond_resched(); | |
6738 | } while (1); | |
6739 | } | |
31b51510 | 6740 | |
a3df7698 | 6741 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6742 | if (ret) |
a3df7698 | 6743 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6744 | } |
6745 | ||
aeca241b | 6746 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6747 | unsigned i) |
65e19f54 | 6748 | { |
042b0d85 | 6749 | return &table->files[i]; |
dafecf19 PB |
6750 | } |
6751 | ||
65e19f54 JA |
6752 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6753 | int index) | |
6754 | { | |
aeca241b | 6755 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6756 | |
a04b0ac0 | 6757 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6758 | } |
6759 | ||
a04b0ac0 | 6760 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6761 | { |
6762 | unsigned long file_ptr = (unsigned long) file; | |
6763 | ||
35645ac3 PB |
6764 | if (__io_file_supports_nowait(file)) |
6765 | file_ptr |= FFS_NOWAIT; | |
9a321c98 PB |
6766 | if (S_ISREG(file_inode(file)->i_mode)) |
6767 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6768 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6769 | } |
6770 | ||
ac177053 PB |
6771 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6772 | struct io_kiocb *req, int fd) | |
09bb8394 | 6773 | { |
8da11c19 | 6774 | struct file *file; |
ac177053 | 6775 | unsigned long file_ptr; |
09bb8394 | 6776 | |
ac177053 PB |
6777 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6778 | return NULL; | |
6779 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6780 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6781 | file = (struct file *) (file_ptr & FFS_MASK); | |
6782 | file_ptr &= ~FFS_MASK; | |
6783 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 6784 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
a46be971 | 6785 | io_req_set_rsrc_node(req, ctx); |
ac177053 PB |
6786 | return file; |
6787 | } | |
d44f554e | 6788 | |
ac177053 | 6789 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6790 | struct io_kiocb *req, int fd) |
6791 | { | |
62906e89 | 6792 | struct file *file = fget(fd); |
ac177053 PB |
6793 | |
6794 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6795 | |
ac177053 PB |
6796 | /* we don't allow fixed io_uring files */ |
6797 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6798 | io_req_track_inflight(req); | |
8371adf5 | 6799 | return file; |
09bb8394 JA |
6800 | } |
6801 | ||
ac177053 | 6802 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6803 | struct io_kiocb *req, int fd, bool fixed) |
6804 | { | |
6805 | if (fixed) | |
6806 | return io_file_get_fixed(ctx, req, fd); | |
6807 | else | |
62906e89 | 6808 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6809 | } |
6810 | ||
f237c30a | 6811 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6812 | { |
6813 | struct io_kiocb *prev = req->timeout.prev; | |
8cb01fac | 6814 | int ret; |
89b263f6 JA |
6815 | |
6816 | if (prev) { | |
8cb01fac | 6817 | ret = io_try_cancel_userdata(req, prev->user_data); |
505657bc | 6818 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6819 | io_put_req(prev); |
89b263f6 JA |
6820 | } else { |
6821 | io_req_complete_post(req, -ETIME, 0); | |
6822 | } | |
6823 | } | |
6824 | ||
2665abfd | 6825 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6826 | { |
ad8a48ac JA |
6827 | struct io_timeout_data *data = container_of(timer, |
6828 | struct io_timeout_data, timer); | |
90cd7e42 | 6829 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6830 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6831 | unsigned long flags; |
2665abfd | 6832 | |
89b263f6 | 6833 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6834 | prev = req->timeout.head; |
6835 | req->timeout.head = NULL; | |
2665abfd JA |
6836 | |
6837 | /* | |
6838 | * We don't expect the list to be empty, that will only happen if we | |
6839 | * race with the completion of the linked work. | |
6840 | */ | |
447c19f3 | 6841 | if (prev) { |
f2f87370 | 6842 | io_remove_next_linked(prev); |
447c19f3 PB |
6843 | if (!req_ref_inc_not_zero(prev)) |
6844 | prev = NULL; | |
6845 | } | |
ef9dd637 | 6846 | list_del(&req->timeout.list); |
89b263f6 JA |
6847 | req->timeout.prev = prev; |
6848 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6849 | |
89b263f6 JA |
6850 | req->io_task_work.func = io_req_task_link_timeout; |
6851 | io_req_task_work_add(req); | |
2665abfd JA |
6852 | return HRTIMER_NORESTART; |
6853 | } | |
6854 | ||
de968c18 | 6855 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6856 | { |
de968c18 PB |
6857 | struct io_ring_ctx *ctx = req->ctx; |
6858 | ||
89b263f6 | 6859 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6860 | /* |
f2f87370 PB |
6861 | * If the back reference is NULL, then our linked request finished |
6862 | * before we got a chance to setup the timer | |
76a46e06 | 6863 | */ |
90cd7e42 | 6864 | if (req->timeout.head) { |
e8c2bc1f | 6865 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6866 | |
ad8a48ac JA |
6867 | data->timer.function = io_link_timeout_fn; |
6868 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6869 | data->mode); | |
ef9dd637 | 6870 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6871 | } |
89b263f6 | 6872 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6873 | /* drop submission reference */ |
76a46e06 JA |
6874 | io_put_req(req); |
6875 | } | |
2665abfd | 6876 | |
d475a9a6 PB |
6877 | static void io_queue_sqe_arm_apoll(struct io_kiocb *req) |
6878 | __must_hold(&req->ctx->uring_lock) | |
6879 | { | |
6880 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); | |
6881 | ||
6882 | switch (io_arm_poll_handler(req)) { | |
6883 | case IO_APOLL_READY: | |
6884 | if (linked_timeout) { | |
6885 | io_unprep_linked_timeout(req); | |
6886 | linked_timeout = NULL; | |
6887 | } | |
6888 | io_req_task_queue(req); | |
6889 | break; | |
6890 | case IO_APOLL_ABORTED: | |
6891 | /* | |
6892 | * Queued up for async execution, worker will release | |
6893 | * submit reference when the iocb is actually submitted. | |
6894 | */ | |
6895 | io_queue_async_work(req, NULL); | |
6896 | break; | |
6897 | } | |
6898 | ||
6899 | if (linked_timeout) | |
6900 | io_queue_linked_timeout(linked_timeout); | |
6901 | } | |
6902 | ||
6903 | static inline void __io_queue_sqe(struct io_kiocb *req) | |
282cdc86 | 6904 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6905 | { |
906c6caa | 6906 | struct io_kiocb *linked_timeout; |
e0c5c576 | 6907 | int ret; |
2b188cc1 | 6908 | |
c5eef2b9 | 6909 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6910 | |
fff4e40e PB |
6911 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
6912 | io_req_add_compl_list(req); | |
d9f9d284 | 6913 | return; |
fff4e40e | 6914 | } |
491381ce JA |
6915 | /* |
6916 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6917 | * doesn't support non-blocking read/write attempts | |
6918 | */ | |
1840038e | 6919 | if (likely(!ret)) { |
906c6caa PB |
6920 | linked_timeout = io_prep_linked_timeout(req); |
6921 | if (linked_timeout) | |
6922 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 6923 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d475a9a6 | 6924 | io_queue_sqe_arm_apoll(req); |
0d63c148 | 6925 | } else { |
f41db273 | 6926 | io_req_complete_failed(req, ret); |
9e645e11 | 6927 | } |
2b188cc1 JA |
6928 | } |
6929 | ||
4652fe3f | 6930 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 6931 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 6932 | { |
4652fe3f | 6933 | if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 6934 | io_req_complete_fail_submit(req); |
e0eb71dc PB |
6935 | } else if (unlikely(req->ctx->drain_active)) { |
6936 | io_drain_req(req); | |
76cc33d7 PB |
6937 | } else { |
6938 | int ret = io_req_prep_async(req); | |
6939 | ||
6940 | if (unlikely(ret)) | |
6941 | io_req_complete_failed(req, ret); | |
6942 | else | |
f237c30a | 6943 | io_queue_async_work(req, NULL); |
ce35a47a | 6944 | } |
4fe2c963 JL |
6945 | } |
6946 | ||
4652fe3f PB |
6947 | static inline void io_queue_sqe(struct io_kiocb *req) |
6948 | __must_hold(&req->ctx->uring_lock) | |
6949 | { | |
6950 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) | |
6951 | __io_queue_sqe(req); | |
6952 | else | |
6953 | io_queue_sqe_fallback(req); | |
6954 | } | |
6955 | ||
b16fed66 PB |
6956 | /* |
6957 | * Check SQE restrictions (opcode and flags). | |
6958 | * | |
6959 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6960 | */ | |
6961 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6962 | struct io_kiocb *req, | |
6963 | unsigned int sqe_flags) | |
4fe2c963 | 6964 | { |
b16fed66 PB |
6965 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
6966 | return false; | |
6967 | ||
6968 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6969 | ctx->restrictions.sqe_flags_required) | |
6970 | return false; | |
6971 | ||
6972 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6973 | ctx->restrictions.sqe_flags_required)) | |
6974 | return false; | |
6975 | ||
6976 | return true; | |
4fe2c963 JL |
6977 | } |
6978 | ||
22b2ca31 PB |
6979 | static void io_init_req_drain(struct io_kiocb *req) |
6980 | { | |
6981 | struct io_ring_ctx *ctx = req->ctx; | |
6982 | struct io_kiocb *head = ctx->submit_state.link.head; | |
6983 | ||
6984 | ctx->drain_active = true; | |
6985 | if (head) { | |
6986 | /* | |
6987 | * If we need to drain a request in the middle of a link, drain | |
6988 | * the head request and the next request/link after the current | |
6989 | * link. Considering sequential execution of links, | |
6990 | * IOSQE_IO_DRAIN will be maintained for every request of our | |
6991 | * link. | |
6992 | */ | |
6993 | head->flags |= IOSQE_IO_DRAIN | REQ_F_FORCE_ASYNC; | |
6994 | ctx->drain_next = true; | |
6995 | } | |
6996 | } | |
6997 | ||
b16fed66 PB |
6998 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
6999 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7000 | __must_hold(&ctx->uring_lock) |
b16fed66 | 7001 | { |
b16fed66 | 7002 | unsigned int sqe_flags; |
fc0ae024 | 7003 | int personality; |
4a04d1d1 | 7004 | u8 opcode; |
b16fed66 | 7005 | |
864ea921 | 7006 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 7007 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
7008 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
7009 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7010 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7011 | req->file = NULL; |
b16fed66 | 7012 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7013 | req->task = current; |
b16fed66 | 7014 | |
4a04d1d1 PB |
7015 | if (unlikely(opcode >= IORING_OP_LAST)) { |
7016 | req->opcode = 0; | |
b16fed66 | 7017 | return -EINVAL; |
4a04d1d1 | 7018 | } |
68fe256a PB |
7019 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
7020 | /* enforce forwards compatibility on users */ | |
7021 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
7022 | return -EINVAL; | |
7023 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
4a04d1d1 | 7024 | !io_op_defs[opcode].buffer_select) |
68fe256a | 7025 | return -EOPNOTSUPP; |
22b2ca31 PB |
7026 | if (sqe_flags & IOSQE_IO_DRAIN) |
7027 | io_init_req_drain(req); | |
2a56a9bd PB |
7028 | } |
7029 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
7030 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
7031 | return -EACCES; | |
7032 | /* knock it to the slow queue path, will be drained there */ | |
7033 | if (ctx->drain_active) | |
7034 | req->flags |= REQ_F_FORCE_ASYNC; | |
7035 | /* if there is no link, we're at "next" request and need to drain */ | |
7036 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
7037 | ctx->drain_next = false; | |
7038 | ctx->drain_active = true; | |
22b2ca31 | 7039 | req->flags |= IOSQE_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 7040 | } |
68fe256a | 7041 | } |
b16fed66 | 7042 | |
4a04d1d1 | 7043 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
7044 | struct io_submit_state *state = &ctx->submit_state; |
7045 | ||
7046 | /* | |
7047 | * Plug now if we have more than 2 IO left after this, and the | |
7048 | * target is potentially a read/write to block based storage. | |
7049 | */ | |
4a04d1d1 | 7050 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
7051 | state->plug_started = true; |
7052 | state->need_plug = false; | |
7053 | blk_start_plug(&state->plug); | |
7054 | } | |
7055 | ||
62906e89 | 7056 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 7057 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 | 7058 | if (unlikely(!req->file)) |
fc0ae024 | 7059 | return -EBADF; |
b16fed66 | 7060 | } |
fc0ae024 | 7061 | |
4a04d1d1 PB |
7062 | personality = READ_ONCE(sqe->personality); |
7063 | if (personality) { | |
7064 | req->creds = xa_load(&ctx->personalities, personality); | |
7065 | if (!req->creds) | |
7066 | return -EINVAL; | |
7067 | get_cred(req->creds); | |
7068 | req->flags |= REQ_F_CREDS; | |
7069 | } | |
7070 | ||
fc0ae024 | 7071 | return io_req_prep(req, sqe); |
b16fed66 PB |
7072 | } |
7073 | ||
a6b8cadc | 7074 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7075 | const struct io_uring_sqe *sqe) |
282cdc86 | 7076 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7077 | { |
a1ab7b35 | 7078 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7079 | int ret; |
9e645e11 | 7080 | |
a6b8cadc PB |
7081 | ret = io_init_req(ctx, req, sqe); |
7082 | if (unlikely(ret)) { | |
a87acfde JA |
7083 | trace_io_uring_req_failed(sqe, ret); |
7084 | ||
a8295b98 | 7085 | /* fail even hard links since we don't submit */ |
de59bc10 | 7086 | if (link->head) { |
a8295b98 HX |
7087 | /* |
7088 | * we can judge a link req is failed or cancelled by if | |
7089 | * REQ_F_FAIL is set, but the head is an exception since | |
7090 | * it may be set REQ_F_FAIL because of other req's failure | |
7091 | * so let's leverage req->result to distinguish if a head | |
7092 | * is set REQ_F_FAIL because of its failure or other req's | |
7093 | * failure so that we can set the correct ret code for it. | |
7094 | * init result here to avoid affecting the normal path. | |
7095 | */ | |
7096 | if (!(link->head->flags & REQ_F_FAIL)) | |
7097 | req_fail_link_node(link->head, -ECANCELED); | |
7098 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7099 | /* | |
7100 | * the current req is a normal req, we should return | |
7101 | * error and thus break the submittion loop. | |
7102 | */ | |
7103 | io_req_complete_failed(req, ret); | |
7104 | return ret; | |
de59bc10 | 7105 | } |
a8295b98 | 7106 | req_fail_link_node(req, ret); |
a6b8cadc | 7107 | } |
441b8a78 | 7108 | |
be7053b7 | 7109 | /* don't need @sqe from now on */ |
236daeae OL |
7110 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
7111 | req->flags, true, | |
7112 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7113 | |
9e645e11 JA |
7114 | /* |
7115 | * If we already have a head request, queue this one for async | |
7116 | * submittal once the head completes. If we don't have a head but | |
7117 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7118 | * submitted sync once the chain is complete. If none of those | |
7119 | * conditions are true (normal request), then just queue it. | |
7120 | */ | |
863e0560 PB |
7121 | if (link->head) { |
7122 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7123 | |
a8295b98 HX |
7124 | if (!(req->flags & REQ_F_FAIL)) { |
7125 | ret = io_req_prep_async(req); | |
7126 | if (unlikely(ret)) { | |
7127 | req_fail_link_node(req, ret); | |
7128 | if (!(head->flags & REQ_F_FAIL)) | |
7129 | req_fail_link_node(head, -ECANCELED); | |
7130 | } | |
7131 | } | |
9d76377f | 7132 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7133 | link->last->link = req; |
863e0560 | 7134 | link->last = req; |
32fe525b | 7135 | |
f15a3431 PB |
7136 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) |
7137 | return 0; | |
32fe525b | 7138 | /* last request of a link, enqueue the link */ |
f15a3431 PB |
7139 | link->head = NULL; |
7140 | req = head; | |
7141 | } else if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { | |
7142 | link->head = req; | |
7143 | link->last = req; | |
7144 | return 0; | |
9e645e11 | 7145 | } |
2e6e1fde | 7146 | |
f15a3431 | 7147 | io_queue_sqe(req); |
1d4240cc | 7148 | return 0; |
9e645e11 JA |
7149 | } |
7150 | ||
9a56a232 JA |
7151 | /* |
7152 | * Batched submission is done, ensure local IO is flushed out. | |
7153 | */ | |
553deffd | 7154 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 7155 | { |
553deffd PB |
7156 | struct io_submit_state *state = &ctx->submit_state; |
7157 | ||
a1ab7b35 | 7158 | if (state->link.head) |
de59bc10 | 7159 | io_queue_sqe(state->link.head); |
553deffd | 7160 | /* flush only after queuing links as they can generate completions */ |
c450178d | 7161 | io_submit_flush_completions(ctx); |
27926b68 JA |
7162 | if (state->plug_started) |
7163 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7164 | } |
7165 | ||
7166 | /* | |
7167 | * Start submission side cache. | |
7168 | */ | |
7169 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7170 | unsigned int max_ios) |
9a56a232 | 7171 | { |
27926b68 | 7172 | state->plug_started = false; |
4b628aeb | 7173 | state->need_plug = max_ios > 2; |
a1ab7b35 PB |
7174 | /* set only head, no need to init link_last in advance */ |
7175 | state->link.head = NULL; | |
9a56a232 JA |
7176 | } |
7177 | ||
2b188cc1 JA |
7178 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7179 | { | |
75b28aff | 7180 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7181 | |
caf582c6 PB |
7182 | /* |
7183 | * Ensure any loads from the SQEs are done at this point, | |
7184 | * since once we write the new head, the application could | |
7185 | * write new data to them. | |
7186 | */ | |
7187 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7188 | } |
7189 | ||
2b188cc1 | 7190 | /* |
dd9ae8a0 | 7191 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7192 | * that is mapped by userspace. This means that care needs to be taken to |
7193 | * ensure that reads are stable, as we cannot rely on userspace always | |
7194 | * being a good citizen. If members of the sqe are validated and then later | |
7195 | * used, it's important that those reads are done through READ_ONCE() to | |
7196 | * prevent a re-load down the line. | |
7197 | */ | |
709b302f | 7198 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7199 | { |
ea5ab3b5 | 7200 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7201 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7202 | |
7203 | /* | |
7204 | * The cached sq head (or cq tail) serves two purposes: | |
7205 | * | |
7206 | * 1) allows us to batch the cost of updating the user visible | |
7207 | * head updates. | |
7208 | * 2) allows the kernel side to track the head on its own, even | |
7209 | * though the application is the one updating it. | |
7210 | */ | |
17d3aeb3 | 7211 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7212 | if (likely(head < ctx->sq_entries)) |
7213 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7214 | |
7215 | /* drop invalid entries */ | |
15641e42 PB |
7216 | ctx->cq_extra--; |
7217 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7218 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7219 | return NULL; |
7220 | } | |
7221 | ||
0f212204 | 7222 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7223 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7224 | { |
69629809 | 7225 | unsigned int entries = io_sqring_entries(ctx); |
46c4e16a | 7226 | int submitted = 0; |
6c271ce2 | 7227 | |
51d48dab | 7228 | if (unlikely(!entries)) |
69629809 | 7229 | return 0; |
ee7d46d9 | 7230 | /* make sure SQ entry isn't read before tail */ |
69629809 | 7231 | nr = min3(nr, ctx->sq_entries, entries); |
9a10867a | 7232 | io_get_task_refs(nr); |
6c271ce2 | 7233 | |
ba88ff11 | 7234 | io_submit_state_start(&ctx->submit_state, nr); |
69629809 | 7235 | do { |
3529d8c2 | 7236 | const struct io_uring_sqe *sqe; |
196be95c | 7237 | struct io_kiocb *req; |
fb5ccc98 | 7238 | |
a33ae9ce | 7239 | if (unlikely(!io_alloc_req_refill(ctx))) { |
196be95c PB |
7240 | if (!submitted) |
7241 | submitted = -EAGAIN; | |
fb5ccc98 | 7242 | break; |
196be95c | 7243 | } |
a33ae9ce | 7244 | req = io_alloc_req(ctx); |
4fccfcbb PB |
7245 | sqe = io_get_sqe(ctx); |
7246 | if (unlikely(!sqe)) { | |
c2b6c6bc | 7247 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
4fccfcbb PB |
7248 | break; |
7249 | } | |
d3656344 JA |
7250 | /* will complete beyond this point, count as submitted */ |
7251 | submitted++; | |
a1ab7b35 | 7252 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7253 | break; |
69629809 | 7254 | } while (submitted < nr); |
6c271ce2 | 7255 | |
9466f437 PB |
7256 | if (unlikely(submitted != nr)) { |
7257 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7258 | int unused = nr - ref_used; |
9466f437 | 7259 | |
09899b19 | 7260 | current->io_uring->cached_refs += unused; |
9466f437 | 7261 | } |
6c271ce2 | 7262 | |
553deffd | 7263 | io_submit_state_end(ctx); |
ae9428ca PB |
7264 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7265 | io_commit_sqring(ctx); | |
7266 | ||
6c271ce2 JA |
7267 | return submitted; |
7268 | } | |
7269 | ||
e4b6d902 PB |
7270 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7271 | { | |
7272 | return READ_ONCE(sqd->state); | |
7273 | } | |
7274 | ||
23b3628e XW |
7275 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7276 | { | |
7277 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7278 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7279 | WRITE_ONCE(ctx->rings->sq_flags, |
7280 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7281 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7282 | } |
7283 | ||
7284 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7285 | { | |
79ebeaee | 7286 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7287 | WRITE_ONCE(ctx->rings->sq_flags, |
7288 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7289 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7290 | } |
7291 | ||
08369246 | 7292 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7293 | { |
c8d1ba58 | 7294 | unsigned int to_submit; |
bdcd3eab | 7295 | int ret = 0; |
6c271ce2 | 7296 | |
c8d1ba58 | 7297 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7298 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7299 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7300 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7301 | |
5eef4e87 | 7302 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
7303 | const struct cred *creds = NULL; |
7304 | ||
7305 | if (ctx->sq_creds != current_cred()) | |
7306 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7307 | |
c8d1ba58 | 7308 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 7309 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 7310 | io_do_iopoll(ctx, true); |
906a3c6f | 7311 | |
3b763ba1 PB |
7312 | /* |
7313 | * Don't submit if refs are dying, good for io_uring_register(), | |
7314 | * but also it is relied upon by io_ring_exit_work() | |
7315 | */ | |
0298ef96 PB |
7316 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7317 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7318 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7319 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7320 | |
acfb381d PB |
7321 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7322 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7323 | if (creds) |
7324 | revert_creds(creds); | |
acfb381d | 7325 | } |
6c271ce2 | 7326 | |
08369246 XW |
7327 | return ret; |
7328 | } | |
6c271ce2 | 7329 | |
c072481d | 7330 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
7331 | { |
7332 | struct io_ring_ctx *ctx; | |
7333 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7334 | |
c9dca27d PB |
7335 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7336 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7337 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7338 | } |
6c271ce2 | 7339 | |
e4b6d902 PB |
7340 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7341 | { | |
7342 | bool did_sig = false; | |
7343 | struct ksignal ksig; | |
7344 | ||
7345 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7346 | signal_pending(current)) { | |
7347 | mutex_unlock(&sqd->lock); | |
7348 | if (signal_pending(current)) | |
7349 | did_sig = get_signal(&ksig); | |
7350 | cond_resched(); | |
7351 | mutex_lock(&sqd->lock); | |
7352 | } | |
e4b6d902 PB |
7353 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7354 | } | |
7355 | ||
c8d1ba58 JA |
7356 | static int io_sq_thread(void *data) |
7357 | { | |
69fb2131 JA |
7358 | struct io_sq_data *sqd = data; |
7359 | struct io_ring_ctx *ctx; | |
a0d9205f | 7360 | unsigned long timeout = 0; |
37d1e2e3 | 7361 | char buf[TASK_COMM_LEN]; |
08369246 | 7362 | DEFINE_WAIT(wait); |
6c271ce2 | 7363 | |
696ee88a | 7364 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7365 | set_task_comm(current, buf); |
37d1e2e3 JA |
7366 | |
7367 | if (sqd->sq_cpu != -1) | |
7368 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7369 | else | |
7370 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7371 | current->flags |= PF_NO_SETAFFINITY; | |
7372 | ||
09a6f4ef | 7373 | mutex_lock(&sqd->lock); |
e4b6d902 | 7374 | while (1) { |
1a924a80 | 7375 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7376 | |
e4b6d902 PB |
7377 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7378 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7379 | break; |
08369246 XW |
7380 | timeout = jiffies + sqd->sq_thread_idle; |
7381 | } | |
e4b6d902 | 7382 | |
e95eee2d | 7383 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7384 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7385 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7386 | |
5eef4e87 | 7387 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 7388 | sqt_spin = true; |
69fb2131 | 7389 | } |
dd432ea5 PB |
7390 | if (io_run_task_work()) |
7391 | sqt_spin = true; | |
6c271ce2 | 7392 | |
08369246 | 7393 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7394 | cond_resched(); |
08369246 XW |
7395 | if (sqt_spin) |
7396 | timeout = jiffies + sqd->sq_thread_idle; | |
7397 | continue; | |
7398 | } | |
7399 | ||
08369246 | 7400 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7401 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7402 | bool needs_sched = true; |
7403 | ||
724cb4f9 | 7404 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7405 | io_ring_set_wakeup_flag(ctx); |
7406 | ||
724cb4f9 | 7407 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 7408 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
7409 | needs_sched = false; |
7410 | break; | |
7411 | } | |
7412 | if (io_sqring_entries(ctx)) { | |
7413 | needs_sched = false; | |
7414 | break; | |
7415 | } | |
7416 | } | |
7417 | ||
7418 | if (needs_sched) { | |
7419 | mutex_unlock(&sqd->lock); | |
7420 | schedule(); | |
7421 | mutex_lock(&sqd->lock); | |
7422 | } | |
69fb2131 JA |
7423 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7424 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7425 | } |
08369246 XW |
7426 | |
7427 | finish_wait(&sqd->wait, &wait); | |
7428 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7429 | } |
28cea78a | 7430 | |
78cc687b | 7431 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7432 | sqd->thread = NULL; |
05962f95 | 7433 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7434 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7435 | io_run_task_work(); |
734551df PB |
7436 | mutex_unlock(&sqd->lock); |
7437 | ||
37d1e2e3 JA |
7438 | complete(&sqd->exited); |
7439 | do_exit(0); | |
6c271ce2 JA |
7440 | } |
7441 | ||
bda52162 JA |
7442 | struct io_wait_queue { |
7443 | struct wait_queue_entry wq; | |
7444 | struct io_ring_ctx *ctx; | |
5fd46178 | 7445 | unsigned cq_tail; |
bda52162 JA |
7446 | unsigned nr_timeouts; |
7447 | }; | |
7448 | ||
6c503150 | 7449 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7450 | { |
7451 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7452 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7453 | |
7454 | /* | |
d195a66e | 7455 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7456 | * started waiting. For timeouts, we always want to return to userspace, |
7457 | * regardless of event count. | |
7458 | */ | |
5fd46178 | 7459 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7460 | } |
7461 | ||
7462 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7463 | int wake_flags, void *key) | |
7464 | { | |
7465 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7466 | wq); | |
7467 | ||
6c503150 PB |
7468 | /* |
7469 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7470 | * the task, and the next invocation will do it. | |
7471 | */ | |
5ed7a37d | 7472 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7473 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7474 | return -1; | |
bda52162 JA |
7475 | } |
7476 | ||
af9c1a44 JA |
7477 | static int io_run_task_work_sig(void) |
7478 | { | |
7479 | if (io_run_task_work()) | |
7480 | return 1; | |
7481 | if (!signal_pending(current)) | |
7482 | return 0; | |
0b8cfa97 | 7483 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7484 | return -ERESTARTSYS; |
af9c1a44 JA |
7485 | return -EINTR; |
7486 | } | |
7487 | ||
eeb60b9a PB |
7488 | /* when returns >0, the caller should retry */ |
7489 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7490 | struct io_wait_queue *iowq, | |
7491 | signed long *timeout) | |
7492 | { | |
7493 | int ret; | |
7494 | ||
7495 | /* make sure we run task_work before checking for signals */ | |
7496 | ret = io_run_task_work_sig(); | |
7497 | if (ret || io_should_wake(iowq)) | |
7498 | return ret; | |
7499 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7500 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7501 | return 1; |
7502 | ||
7503 | *timeout = schedule_timeout(*timeout); | |
7504 | return !*timeout ? -ETIME : 1; | |
7505 | } | |
7506 | ||
2b188cc1 JA |
7507 | /* |
7508 | * Wait until events become available, if we don't already have some. The | |
7509 | * application must reap them itself, as they reside on the shared cq ring. | |
7510 | */ | |
7511 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7512 | const sigset_t __user *sig, size_t sigsz, |
7513 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7514 | { |
90291099 | 7515 | struct io_wait_queue iowq; |
75b28aff | 7516 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7517 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7518 | int ret; | |
2b188cc1 | 7519 | |
b41e9852 | 7520 | do { |
90f67366 | 7521 | io_cqring_overflow_flush(ctx); |
6c503150 | 7522 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7523 | return 0; |
4c6e277c | 7524 | if (!io_run_task_work()) |
b41e9852 | 7525 | break; |
b41e9852 | 7526 | } while (1); |
2b188cc1 | 7527 | |
44df58d4 XW |
7528 | if (uts) { |
7529 | struct timespec64 ts; | |
7530 | ||
7531 | if (get_timespec64(&ts, uts)) | |
7532 | return -EFAULT; | |
7533 | timeout = timespec64_to_jiffies(&ts); | |
7534 | } | |
7535 | ||
2b188cc1 | 7536 | if (sig) { |
9e75ad5d AB |
7537 | #ifdef CONFIG_COMPAT |
7538 | if (in_compat_syscall()) | |
7539 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7540 | sigsz); |
9e75ad5d AB |
7541 | else |
7542 | #endif | |
b772434b | 7543 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7544 | |
2b188cc1 JA |
7545 | if (ret) |
7546 | return ret; | |
7547 | } | |
7548 | ||
90291099 PB |
7549 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7550 | iowq.wq.private = current; | |
7551 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7552 | iowq.ctx = ctx; | |
bda52162 | 7553 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7554 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7555 | |
c826bd7a | 7556 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7557 | do { |
ca0a2651 | 7558 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7559 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7560 | ret = -EBUSY; |
7561 | break; | |
7562 | } | |
311997b3 | 7563 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7564 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7565 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7566 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7567 | cond_resched(); |
eeb60b9a | 7568 | } while (ret > 0); |
bda52162 | 7569 | |
b7db41c9 | 7570 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7571 | |
75b28aff | 7572 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7573 | } |
7574 | ||
9123c8ff | 7575 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7576 | { |
9123c8ff | 7577 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7578 | |
846a4ef2 | 7579 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7580 | kfree(table[i]); |
7581 | kfree(table); | |
7582 | } | |
7583 | ||
c072481d | 7584 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
7585 | { |
7586 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7587 | size_t init_size = size; | |
7588 | void **table; | |
7589 | ||
0bea96f5 | 7590 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7591 | if (!table) |
7592 | return NULL; | |
7593 | ||
7594 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7595 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7596 | |
0bea96f5 | 7597 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7598 | if (!table[i]) { |
7599 | io_free_page_table(table, init_size); | |
7600 | return NULL; | |
7601 | } | |
7602 | size -= this_size; | |
7603 | } | |
7604 | return table; | |
05f3fb3c JA |
7605 | } |
7606 | ||
28a9fe25 | 7607 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7608 | { |
28a9fe25 PB |
7609 | percpu_ref_exit(&ref_node->refs); |
7610 | kfree(ref_node); | |
1642b445 PB |
7611 | } |
7612 | ||
c072481d | 7613 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
7614 | { |
7615 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7616 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7617 | unsigned long flags; | |
7618 | bool first_add = false; | |
7619 | ||
7620 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7621 | node->done = true; | |
7622 | ||
7623 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7624 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7625 | struct io_rsrc_node, node); | |
7626 | /* recycle ref nodes in order */ | |
7627 | if (!node->done) | |
7628 | break; | |
7629 | list_del(&node->node); | |
7630 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7631 | } | |
7632 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7633 | ||
7634 | if (first_add) | |
7635 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7636 | } | |
7637 | ||
7638 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7639 | { | |
7640 | struct io_rsrc_node *ref_node; | |
7641 | ||
7642 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7643 | if (!ref_node) | |
7644 | return NULL; | |
7645 | ||
7646 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7647 | 0, GFP_KERNEL)) { | |
7648 | kfree(ref_node); | |
7649 | return NULL; | |
7650 | } | |
7651 | INIT_LIST_HEAD(&ref_node->node); | |
7652 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7653 | ref_node->done = false; | |
7654 | return ref_node; | |
7655 | } | |
7656 | ||
a7f0ed5a PB |
7657 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7658 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 7659 | __must_hold(&ctx->uring_lock) |
6b06314c | 7660 | { |
a7f0ed5a PB |
7661 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7662 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7663 | |
ab409402 PB |
7664 | io_rsrc_refs_drop(ctx); |
7665 | ||
a7f0ed5a PB |
7666 | if (data_to_kill) { |
7667 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7668 | |
a7f0ed5a | 7669 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7670 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7671 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7672 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7673 | |
3e942498 | 7674 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7675 | percpu_ref_kill(&rsrc_node->refs); |
7676 | ctx->rsrc_node = NULL; | |
7677 | } | |
6b06314c | 7678 | |
a7f0ed5a PB |
7679 | if (!ctx->rsrc_node) { |
7680 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7681 | ctx->rsrc_backup_node = NULL; | |
7682 | } | |
8bad28d8 HX |
7683 | } |
7684 | ||
a7f0ed5a | 7685 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7686 | { |
7687 | if (ctx->rsrc_backup_node) | |
7688 | return 0; | |
b895c9a6 | 7689 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7690 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7691 | } |
7692 | ||
c072481d PB |
7693 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
7694 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
7695 | { |
7696 | int ret; | |
05589553 | 7697 | |
215c3902 | 7698 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7699 | if (data->quiesce) |
7700 | return -ENXIO; | |
05589553 | 7701 | |
8bad28d8 | 7702 | data->quiesce = true; |
1ffc5422 | 7703 | do { |
a7f0ed5a | 7704 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7705 | if (ret) |
f2303b1f | 7706 | break; |
a7f0ed5a | 7707 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7708 | |
3e942498 PB |
7709 | /* kill initial ref, already quiesced if zero */ |
7710 | if (atomic_dec_and_test(&data->refs)) | |
7711 | break; | |
c018db4a | 7712 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7713 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7714 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7715 | if (!ret) { |
7716 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7717 | break; |
c018db4a | 7718 | } |
8bad28d8 | 7719 | |
3e942498 PB |
7720 | atomic_inc(&data->refs); |
7721 | /* wait for all works potentially completing data->done */ | |
7722 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7723 | reinit_completion(&data->done); |
8dd03afe | 7724 | |
1ffc5422 | 7725 | ret = io_run_task_work_sig(); |
8bad28d8 | 7726 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7727 | } while (ret >= 0); |
8bad28d8 | 7728 | data->quiesce = false; |
05f3fb3c | 7729 | |
8bad28d8 | 7730 | return ret; |
d7954b2b BM |
7731 | } |
7732 | ||
2d091d62 PB |
7733 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7734 | { | |
7735 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7736 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7737 | ||
7738 | return &data->tags[table_idx][off]; | |
7739 | } | |
7740 | ||
44b31f2f | 7741 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7742 | { |
2d091d62 PB |
7743 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7744 | ||
7745 | if (data->tags) | |
7746 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7747 | kfree(data); |
7748 | } | |
7749 | ||
c072481d PB |
7750 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7751 | u64 __user *utags, unsigned nr, | |
7752 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7753 | { |
b895c9a6 | 7754 | struct io_rsrc_data *data; |
2d091d62 | 7755 | int ret = -ENOMEM; |
d878c816 | 7756 | unsigned i; |
1ad555c6 BM |
7757 | |
7758 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7759 | if (!data) | |
d878c816 | 7760 | return -ENOMEM; |
2d091d62 | 7761 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7762 | if (!data->tags) { |
1ad555c6 | 7763 | kfree(data); |
d878c816 PB |
7764 | return -ENOMEM; |
7765 | } | |
2d091d62 PB |
7766 | |
7767 | data->nr = nr; | |
7768 | data->ctx = ctx; | |
7769 | data->do_put = do_put; | |
d878c816 | 7770 | if (utags) { |
2d091d62 | 7771 | ret = -EFAULT; |
d878c816 | 7772 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7773 | u64 *tag_slot = io_get_tag_slot(data, i); |
7774 | ||
7775 | if (copy_from_user(tag_slot, &utags[i], | |
7776 | sizeof(*tag_slot))) | |
2d091d62 | 7777 | goto fail; |
d878c816 | 7778 | } |
1ad555c6 | 7779 | } |
b60c8dce | 7780 | |
3e942498 | 7781 | atomic_set(&data->refs, 1); |
1ad555c6 | 7782 | init_completion(&data->done); |
d878c816 PB |
7783 | *pdata = data; |
7784 | return 0; | |
2d091d62 PB |
7785 | fail: |
7786 | io_rsrc_data_free(data); | |
7787 | return ret; | |
1ad555c6 BM |
7788 | } |
7789 | ||
9123c8ff PB |
7790 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7791 | { | |
0bea96f5 PB |
7792 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7793 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7794 | return !!table->files; |
7795 | } | |
7796 | ||
042b0d85 | 7797 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7798 | { |
042b0d85 | 7799 | kvfree(table->files); |
9123c8ff PB |
7800 | table->files = NULL; |
7801 | } | |
7802 | ||
fff4db76 | 7803 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7804 | { |
fff4db76 PB |
7805 | #if defined(CONFIG_UNIX) |
7806 | if (ctx->ring_sock) { | |
7807 | struct sock *sock = ctx->ring_sock->sk; | |
7808 | struct sk_buff *skb; | |
7809 | ||
7810 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7811 | kfree_skb(skb); | |
7812 | } | |
7813 | #else | |
7814 | int i; | |
7815 | ||
7816 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7817 | struct file *file; | |
7818 | ||
7819 | file = io_file_from_index(ctx, i); | |
7820 | if (file) | |
7821 | fput(file); | |
7822 | } | |
7823 | #endif | |
042b0d85 | 7824 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7825 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7826 | ctx->file_data = NULL; |
7827 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7828 | } |
7829 | ||
d7954b2b BM |
7830 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7831 | { | |
d7954b2b BM |
7832 | int ret; |
7833 | ||
08480400 | 7834 | if (!ctx->file_data) |
d7954b2b | 7835 | return -ENXIO; |
08480400 PB |
7836 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7837 | if (!ret) | |
7838 | __io_sqe_files_unregister(ctx); | |
7839 | return ret; | |
6b06314c JA |
7840 | } |
7841 | ||
37d1e2e3 | 7842 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7843 | __releases(&sqd->lock) |
37d1e2e3 | 7844 | { |
521d6a73 PB |
7845 | WARN_ON_ONCE(sqd->thread == current); |
7846 | ||
9e138a48 PB |
7847 | /* |
7848 | * Do the dance but not conditional clear_bit() because it'd race with | |
7849 | * other threads incrementing park_pending and setting the bit. | |
7850 | */ | |
37d1e2e3 | 7851 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7852 | if (atomic_dec_return(&sqd->park_pending)) |
7853 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7854 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7855 | } |
7856 | ||
86e0d676 | 7857 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7858 | __acquires(&sqd->lock) |
37d1e2e3 | 7859 | { |
521d6a73 PB |
7860 | WARN_ON_ONCE(sqd->thread == current); |
7861 | ||
9e138a48 | 7862 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7863 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7864 | mutex_lock(&sqd->lock); |
05962f95 | 7865 | if (sqd->thread) |
86e0d676 | 7866 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7867 | } |
7868 | ||
7869 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7870 | { | |
521d6a73 | 7871 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7872 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7873 | |
05962f95 | 7874 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7875 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7876 | if (sqd->thread) |
7877 | wake_up_process(sqd->thread); | |
09a6f4ef | 7878 | mutex_unlock(&sqd->lock); |
05962f95 | 7879 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7880 | } |
7881 | ||
534ca6d6 | 7882 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7883 | { |
534ca6d6 | 7884 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7885 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7886 | ||
37d1e2e3 JA |
7887 | io_sq_thread_stop(sqd); |
7888 | kfree(sqd); | |
7889 | } | |
7890 | } | |
7891 | ||
7892 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7893 | { | |
7894 | struct io_sq_data *sqd = ctx->sq_data; | |
7895 | ||
7896 | if (sqd) { | |
05962f95 | 7897 | io_sq_thread_park(sqd); |
521d6a73 | 7898 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7899 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7900 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7901 | |
7902 | io_put_sq_data(sqd); | |
7903 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7904 | } |
7905 | } | |
7906 | ||
aa06165d JA |
7907 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7908 | { | |
7909 | struct io_ring_ctx *ctx_attach; | |
7910 | struct io_sq_data *sqd; | |
7911 | struct fd f; | |
7912 | ||
7913 | f = fdget(p->wq_fd); | |
7914 | if (!f.file) | |
7915 | return ERR_PTR(-ENXIO); | |
7916 | if (f.file->f_op != &io_uring_fops) { | |
7917 | fdput(f); | |
7918 | return ERR_PTR(-EINVAL); | |
7919 | } | |
7920 | ||
7921 | ctx_attach = f.file->private_data; | |
7922 | sqd = ctx_attach->sq_data; | |
7923 | if (!sqd) { | |
7924 | fdput(f); | |
7925 | return ERR_PTR(-EINVAL); | |
7926 | } | |
5c2469e0 JA |
7927 | if (sqd->task_tgid != current->tgid) { |
7928 | fdput(f); | |
7929 | return ERR_PTR(-EPERM); | |
7930 | } | |
aa06165d JA |
7931 | |
7932 | refcount_inc(&sqd->refs); | |
7933 | fdput(f); | |
7934 | return sqd; | |
7935 | } | |
7936 | ||
26984fbf PB |
7937 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7938 | bool *attached) | |
534ca6d6 JA |
7939 | { |
7940 | struct io_sq_data *sqd; | |
7941 | ||
26984fbf | 7942 | *attached = false; |
5c2469e0 JA |
7943 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7944 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7945 | if (!IS_ERR(sqd)) { |
7946 | *attached = true; | |
5c2469e0 | 7947 | return sqd; |
26984fbf | 7948 | } |
5c2469e0 JA |
7949 | /* fall through for EPERM case, setup new sqd/task */ |
7950 | if (PTR_ERR(sqd) != -EPERM) | |
7951 | return sqd; | |
7952 | } | |
aa06165d | 7953 | |
534ca6d6 JA |
7954 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7955 | if (!sqd) | |
7956 | return ERR_PTR(-ENOMEM); | |
7957 | ||
9e138a48 | 7958 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7959 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7960 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7961 | mutex_init(&sqd->lock); |
534ca6d6 | 7962 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7963 | init_completion(&sqd->exited); |
534ca6d6 JA |
7964 | return sqd; |
7965 | } | |
7966 | ||
6b06314c | 7967 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7968 | /* |
7969 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7970 | * the io_uring can be safely unregistered on process exit, even if we have | |
7971 | * loops in the file referencing. | |
7972 | */ | |
7973 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7974 | { | |
7975 | struct sock *sk = ctx->ring_sock->sk; | |
7976 | struct scm_fp_list *fpl; | |
7977 | struct sk_buff *skb; | |
08a45173 | 7978 | int i, nr_files; |
6b06314c | 7979 | |
6b06314c JA |
7980 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7981 | if (!fpl) | |
7982 | return -ENOMEM; | |
7983 | ||
7984 | skb = alloc_skb(0, GFP_KERNEL); | |
7985 | if (!skb) { | |
7986 | kfree(fpl); | |
7987 | return -ENOMEM; | |
7988 | } | |
7989 | ||
7990 | skb->sk = sk; | |
6b06314c | 7991 | |
08a45173 | 7992 | nr_files = 0; |
62e398be | 7993 | fpl->user = get_uid(current_user()); |
6b06314c | 7994 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7995 | struct file *file = io_file_from_index(ctx, i + offset); |
7996 | ||
7997 | if (!file) | |
08a45173 | 7998 | continue; |
65e19f54 | 7999 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
8000 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
8001 | nr_files++; | |
6b06314c JA |
8002 | } |
8003 | ||
08a45173 JA |
8004 | if (nr_files) { |
8005 | fpl->max = SCM_MAX_FD; | |
8006 | fpl->count = nr_files; | |
8007 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 8008 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
8009 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
8010 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8011 | |
08a45173 JA |
8012 | for (i = 0; i < nr_files; i++) |
8013 | fput(fpl->fp[i]); | |
8014 | } else { | |
8015 | kfree_skb(skb); | |
8016 | kfree(fpl); | |
8017 | } | |
6b06314c JA |
8018 | |
8019 | return 0; | |
8020 | } | |
8021 | ||
8022 | /* | |
8023 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8024 | * causes regular reference counting to break down. We rely on the UNIX | |
8025 | * garbage collection to take care of this problem for us. | |
8026 | */ | |
8027 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8028 | { | |
8029 | unsigned left, total; | |
8030 | int ret = 0; | |
8031 | ||
8032 | total = 0; | |
8033 | left = ctx->nr_user_files; | |
8034 | while (left) { | |
8035 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8036 | |
8037 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8038 | if (ret) | |
8039 | break; | |
8040 | left -= this_files; | |
8041 | total += this_files; | |
8042 | } | |
8043 | ||
8044 | if (!ret) | |
8045 | return 0; | |
8046 | ||
8047 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8048 | struct file *file = io_file_from_index(ctx, total); |
8049 | ||
8050 | if (file) | |
8051 | fput(file); | |
6b06314c JA |
8052 | total++; |
8053 | } | |
8054 | ||
8055 | return ret; | |
8056 | } | |
8057 | #else | |
8058 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8059 | { | |
8060 | return 0; | |
8061 | } | |
8062 | #endif | |
8063 | ||
47e90392 | 8064 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8065 | { |
50238531 | 8066 | struct file *file = prsrc->file; |
05f3fb3c JA |
8067 | #if defined(CONFIG_UNIX) |
8068 | struct sock *sock = ctx->ring_sock->sk; | |
8069 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8070 | struct sk_buff *skb; | |
8071 | int i; | |
8072 | ||
8073 | __skb_queue_head_init(&list); | |
8074 | ||
8075 | /* | |
8076 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8077 | * remove this entry and rearrange the file array. | |
8078 | */ | |
8079 | skb = skb_dequeue(head); | |
8080 | while (skb) { | |
8081 | struct scm_fp_list *fp; | |
8082 | ||
8083 | fp = UNIXCB(skb).fp; | |
8084 | for (i = 0; i < fp->count; i++) { | |
8085 | int left; | |
8086 | ||
8087 | if (fp->fp[i] != file) | |
8088 | continue; | |
8089 | ||
8090 | unix_notinflight(fp->user, fp->fp[i]); | |
8091 | left = fp->count - 1 - i; | |
8092 | if (left) { | |
8093 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8094 | left * sizeof(struct file *)); | |
8095 | } | |
8096 | fp->count--; | |
8097 | if (!fp->count) { | |
8098 | kfree_skb(skb); | |
8099 | skb = NULL; | |
8100 | } else { | |
8101 | __skb_queue_tail(&list, skb); | |
8102 | } | |
8103 | fput(file); | |
8104 | file = NULL; | |
8105 | break; | |
8106 | } | |
8107 | ||
8108 | if (!file) | |
8109 | break; | |
8110 | ||
8111 | __skb_queue_tail(&list, skb); | |
8112 | ||
8113 | skb = skb_dequeue(head); | |
8114 | } | |
8115 | ||
8116 | if (skb_peek(&list)) { | |
8117 | spin_lock_irq(&head->lock); | |
8118 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8119 | __skb_queue_tail(head, skb); | |
8120 | spin_unlock_irq(&head->lock); | |
8121 | } | |
8122 | #else | |
8123 | fput(file); | |
8124 | #endif | |
8125 | } | |
8126 | ||
b895c9a6 | 8127 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8128 | { |
b895c9a6 | 8129 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8130 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8131 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8132 | |
269bbe5f BM |
8133 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8134 | list_del(&prsrc->list); | |
b60c8dce PB |
8135 | |
8136 | if (prsrc->tag) { | |
8137 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8138 | |
8139 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8140 | spin_lock(&ctx->completion_lock); |
b60c8dce | 8141 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 8142 | ctx->cq_extra++; |
b60c8dce | 8143 | io_commit_cqring(ctx); |
79ebeaee | 8144 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8145 | io_cqring_ev_posted(ctx); |
8146 | io_ring_submit_unlock(ctx, lock_ring); | |
8147 | } | |
8148 | ||
40ae0ff7 | 8149 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8150 | kfree(prsrc); |
65e19f54 | 8151 | } |
05589553 | 8152 | |
28a9fe25 | 8153 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8154 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8155 | complete(&rsrc_data->done); | |
2faf852d | 8156 | } |
65e19f54 | 8157 | |
269bbe5f | 8158 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8159 | { |
8160 | struct io_ring_ctx *ctx; | |
8161 | struct llist_node *node; | |
8162 | ||
269bbe5f BM |
8163 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8164 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8165 | |
8166 | while (node) { | |
b895c9a6 | 8167 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8168 | struct llist_node *next = node->next; |
8169 | ||
b895c9a6 | 8170 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8171 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8172 | node = next; |
8173 | } | |
8174 | } | |
8175 | ||
6b06314c | 8176 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8177 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8178 | { |
8179 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8180 | struct file *file; |
f3baed39 | 8181 | int fd, ret; |
846a4ef2 | 8182 | unsigned i; |
6b06314c | 8183 | |
05f3fb3c | 8184 | if (ctx->file_data) |
6b06314c JA |
8185 | return -EBUSY; |
8186 | if (!nr_args) | |
8187 | return -EINVAL; | |
8188 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8189 | return -EMFILE; | |
3a1b8a4e PB |
8190 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8191 | return -EMFILE; | |
a7f0ed5a | 8192 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8193 | if (ret) |
8194 | return ret; | |
d878c816 PB |
8195 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8196 | &ctx->file_data); | |
8197 | if (ret) | |
8198 | return ret; | |
6b06314c | 8199 | |
f3baed39 | 8200 | ret = -ENOMEM; |
aeca241b | 8201 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8202 | goto out_free; |
65e19f54 | 8203 | |
08a45173 | 8204 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8205 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8206 | ret = -EFAULT; |
8207 | goto out_fput; | |
8208 | } | |
08a45173 | 8209 | /* allow sparse sets */ |
792e3582 PB |
8210 | if (fd == -1) { |
8211 | ret = -EINVAL; | |
2d091d62 | 8212 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8213 | goto out_fput; |
08a45173 | 8214 | continue; |
792e3582 | 8215 | } |
6b06314c | 8216 | |
05f3fb3c | 8217 | file = fget(fd); |
6b06314c | 8218 | ret = -EBADF; |
792e3582 | 8219 | if (unlikely(!file)) |
600cf3f8 | 8220 | goto out_fput; |
05f3fb3c | 8221 | |
6b06314c JA |
8222 | /* |
8223 | * Don't allow io_uring instances to be registered. If UNIX | |
8224 | * isn't enabled, then this causes a reference cycle and this | |
8225 | * instance can never get freed. If UNIX is enabled we'll | |
8226 | * handle it just fine, but there's still no point in allowing | |
8227 | * a ring fd as it doesn't support regular read/write anyway. | |
8228 | */ | |
05f3fb3c JA |
8229 | if (file->f_op == &io_uring_fops) { |
8230 | fput(file); | |
600cf3f8 | 8231 | goto out_fput; |
6b06314c | 8232 | } |
aeca241b | 8233 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8234 | } |
8235 | ||
6b06314c | 8236 | ret = io_sqe_files_scm(ctx); |
05589553 | 8237 | if (ret) { |
08480400 | 8238 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8239 | return ret; |
8240 | } | |
6b06314c | 8241 | |
a7f0ed5a | 8242 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8243 | return ret; |
600cf3f8 PB |
8244 | out_fput: |
8245 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8246 | file = io_file_from_index(ctx, i); | |
8247 | if (file) | |
8248 | fput(file); | |
8249 | } | |
042b0d85 | 8250 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8251 | ctx->nr_user_files = 0; |
600cf3f8 | 8252 | out_free: |
44b31f2f | 8253 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8254 | ctx->file_data = NULL; |
6b06314c JA |
8255 | return ret; |
8256 | } | |
8257 | ||
c3a31e60 JA |
8258 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8259 | int index) | |
8260 | { | |
8261 | #if defined(CONFIG_UNIX) | |
8262 | struct sock *sock = ctx->ring_sock->sk; | |
8263 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8264 | struct sk_buff *skb; | |
8265 | ||
8266 | /* | |
8267 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8268 | * file set. If there's no room, fall back to allocating a new skb | |
8269 | * and filling it in. | |
8270 | */ | |
8271 | spin_lock_irq(&head->lock); | |
8272 | skb = skb_peek(head); | |
8273 | if (skb) { | |
8274 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8275 | ||
8276 | if (fpl->count < SCM_MAX_FD) { | |
8277 | __skb_unlink(skb, head); | |
8278 | spin_unlock_irq(&head->lock); | |
8279 | fpl->fp[fpl->count] = get_file(file); | |
8280 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8281 | fpl->count++; | |
8282 | spin_lock_irq(&head->lock); | |
8283 | __skb_queue_head(head, skb); | |
8284 | } else { | |
8285 | skb = NULL; | |
8286 | } | |
8287 | } | |
8288 | spin_unlock_irq(&head->lock); | |
8289 | ||
8290 | if (skb) { | |
8291 | fput(file); | |
8292 | return 0; | |
8293 | } | |
8294 | ||
8295 | return __io_sqe_files_scm(ctx, 1, index); | |
8296 | #else | |
8297 | return 0; | |
8298 | #endif | |
8299 | } | |
8300 | ||
9c7b0ba8 PB |
8301 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8302 | struct io_rsrc_node *node, void *rsrc) | |
8303 | { | |
8304 | struct io_rsrc_put *prsrc; | |
8305 | ||
8306 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8307 | if (!prsrc) | |
8308 | return -ENOMEM; | |
8309 | ||
8310 | prsrc->tag = *io_get_tag_slot(data, idx); | |
8311 | prsrc->rsrc = rsrc; | |
8312 | list_add(&prsrc->list, &node->rsrc_list); | |
8313 | return 0; | |
8314 | } | |
8315 | ||
b9445598 PB |
8316 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8317 | unsigned int issue_flags, u32 slot_index) | |
8318 | { | |
8319 | struct io_ring_ctx *ctx = req->ctx; | |
8320 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
9c7b0ba8 | 8321 | bool needs_switch = false; |
b9445598 PB |
8322 | struct io_fixed_file *file_slot; |
8323 | int ret = -EBADF; | |
8324 | ||
8325 | io_ring_submit_lock(ctx, !force_nonblock); | |
8326 | if (file->f_op == &io_uring_fops) | |
8327 | goto err; | |
8328 | ret = -ENXIO; | |
8329 | if (!ctx->file_data) | |
8330 | goto err; | |
8331 | ret = -EINVAL; | |
8332 | if (slot_index >= ctx->nr_user_files) | |
8333 | goto err; | |
8334 | ||
8335 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8336 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8337 | |
8338 | if (file_slot->file_ptr) { | |
8339 | struct file *old_file; | |
8340 | ||
8341 | ret = io_rsrc_node_switch_start(ctx); | |
8342 | if (ret) | |
8343 | goto err; | |
8344 | ||
8345 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8346 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8347 | ctx->rsrc_node, old_file); | |
8348 | if (ret) | |
8349 | goto err; | |
8350 | file_slot->file_ptr = 0; | |
8351 | needs_switch = true; | |
8352 | } | |
b9445598 PB |
8353 | |
8354 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8355 | io_fixed_file_set(file_slot, file); | |
8356 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8357 | if (ret) { | |
8358 | file_slot->file_ptr = 0; | |
8359 | goto err; | |
8360 | } | |
8361 | ||
8362 | ret = 0; | |
8363 | err: | |
9c7b0ba8 PB |
8364 | if (needs_switch) |
8365 | io_rsrc_node_switch(ctx, ctx->file_data); | |
b9445598 PB |
8366 | io_ring_submit_unlock(ctx, !force_nonblock); |
8367 | if (ret) | |
8368 | fput(file); | |
8369 | return ret; | |
8370 | } | |
8371 | ||
7df778be PB |
8372 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
8373 | { | |
8374 | unsigned int offset = req->close.file_slot - 1; | |
8375 | struct io_ring_ctx *ctx = req->ctx; | |
8376 | struct io_fixed_file *file_slot; | |
8377 | struct file *file; | |
8378 | int ret, i; | |
8379 | ||
8380 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
8381 | ret = -ENXIO; | |
8382 | if (unlikely(!ctx->file_data)) | |
8383 | goto out; | |
8384 | ret = -EINVAL; | |
8385 | if (offset >= ctx->nr_user_files) | |
8386 | goto out; | |
8387 | ret = io_rsrc_node_switch_start(ctx); | |
8388 | if (ret) | |
8389 | goto out; | |
8390 | ||
8391 | i = array_index_nospec(offset, ctx->nr_user_files); | |
8392 | file_slot = io_fixed_file_slot(&ctx->file_table, i); | |
8393 | ret = -EBADF; | |
8394 | if (!file_slot->file_ptr) | |
8395 | goto out; | |
8396 | ||
8397 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8398 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
8399 | if (ret) | |
8400 | goto out; | |
8401 | ||
8402 | file_slot->file_ptr = 0; | |
8403 | io_rsrc_node_switch(ctx, ctx->file_data); | |
8404 | ret = 0; | |
8405 | out: | |
8406 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
8407 | return ret; | |
8408 | } | |
8409 | ||
05f3fb3c | 8410 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 8411 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8412 | unsigned nr_args) |
8413 | { | |
c3bdad02 | 8414 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8415 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8416 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8417 | struct io_fixed_file *file_slot; |
8418 | struct file *file; | |
98f0b3b4 PB |
8419 | int fd, i, err = 0; |
8420 | unsigned int done; | |
05589553 | 8421 | bool needs_switch = false; |
c3a31e60 | 8422 | |
98f0b3b4 PB |
8423 | if (!ctx->file_data) |
8424 | return -ENXIO; | |
8425 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8426 | return -EINVAL; |
8427 | ||
67973b93 | 8428 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8429 | u64 tag = 0; |
8430 | ||
8431 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8432 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8433 | err = -EFAULT; |
8434 | break; | |
8435 | } | |
c3bdad02 PB |
8436 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8437 | err = -EINVAL; | |
8438 | break; | |
8439 | } | |
4e0377a1 | 8440 | if (fd == IORING_REGISTER_FILES_SKIP) |
8441 | continue; | |
8442 | ||
67973b93 | 8443 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8444 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8445 | |
a04b0ac0 PB |
8446 | if (file_slot->file_ptr) { |
8447 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8448 | err = io_queue_rsrc_removal(data, up->offset + done, |
8449 | ctx->rsrc_node, file); | |
a5318d3c HD |
8450 | if (err) |
8451 | break; | |
a04b0ac0 | 8452 | file_slot->file_ptr = 0; |
05589553 | 8453 | needs_switch = true; |
c3a31e60 JA |
8454 | } |
8455 | if (fd != -1) { | |
c3a31e60 JA |
8456 | file = fget(fd); |
8457 | if (!file) { | |
8458 | err = -EBADF; | |
8459 | break; | |
8460 | } | |
8461 | /* | |
8462 | * Don't allow io_uring instances to be registered. If | |
8463 | * UNIX isn't enabled, then this causes a reference | |
8464 | * cycle and this instance can never get freed. If UNIX | |
8465 | * is enabled we'll handle it just fine, but there's | |
8466 | * still no point in allowing a ring fd as it doesn't | |
8467 | * support regular read/write anyway. | |
8468 | */ | |
8469 | if (file->f_op == &io_uring_fops) { | |
8470 | fput(file); | |
8471 | err = -EBADF; | |
8472 | break; | |
8473 | } | |
2d091d62 | 8474 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8475 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8476 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8477 | if (err) { |
a04b0ac0 | 8478 | file_slot->file_ptr = 0; |
f3bd9dae | 8479 | fput(file); |
c3a31e60 | 8480 | break; |
f3bd9dae | 8481 | } |
c3a31e60 | 8482 | } |
05f3fb3c JA |
8483 | } |
8484 | ||
a7f0ed5a PB |
8485 | if (needs_switch) |
8486 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8487 | return done ? done : err; |
8488 | } | |
05589553 | 8489 | |
685fe7fe JA |
8490 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8491 | struct task_struct *task) | |
24369c2e | 8492 | { |
e941894e | 8493 | struct io_wq_hash *hash; |
24369c2e | 8494 | struct io_wq_data data; |
24369c2e | 8495 | unsigned int concurrency; |
24369c2e | 8496 | |
362a9e65 | 8497 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8498 | hash = ctx->hash_map; |
8499 | if (!hash) { | |
8500 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8501 | if (!hash) { |
8502 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8503 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8504 | } |
e941894e JA |
8505 | refcount_set(&hash->refs, 1); |
8506 | init_waitqueue_head(&hash->wait); | |
8507 | ctx->hash_map = hash; | |
24369c2e | 8508 | } |
362a9e65 | 8509 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8510 | |
e941894e | 8511 | data.hash = hash; |
685fe7fe | 8512 | data.task = task; |
ebc11b6c | 8513 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8514 | data.do_work = io_wq_submit_work; |
24369c2e | 8515 | |
d25e3a3d JA |
8516 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8517 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8518 | |
5aa75ed5 | 8519 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8520 | } |
8521 | ||
c072481d PB |
8522 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
8523 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8524 | { |
8525 | struct io_uring_task *tctx; | |
d8a6df10 | 8526 | int ret; |
0f212204 | 8527 | |
09899b19 | 8528 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8529 | if (unlikely(!tctx)) |
8530 | return -ENOMEM; | |
8531 | ||
d8a6df10 JA |
8532 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8533 | if (unlikely(ret)) { | |
8534 | kfree(tctx); | |
8535 | return ret; | |
8536 | } | |
8537 | ||
685fe7fe | 8538 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8539 | if (IS_ERR(tctx->io_wq)) { |
8540 | ret = PTR_ERR(tctx->io_wq); | |
8541 | percpu_counter_destroy(&tctx->inflight); | |
8542 | kfree(tctx); | |
8543 | return ret; | |
8544 | } | |
8545 | ||
0f212204 JA |
8546 | xa_init(&tctx->xa); |
8547 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8548 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8549 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8550 | task->io_uring = tctx; |
7cbf1722 JA |
8551 | spin_lock_init(&tctx->task_lock); |
8552 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8553 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8554 | return 0; |
8555 | } | |
8556 | ||
8557 | void __io_uring_free(struct task_struct *tsk) | |
8558 | { | |
8559 | struct io_uring_task *tctx = tsk->io_uring; | |
8560 | ||
8561 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8562 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8563 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8564 | |
d8a6df10 | 8565 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8566 | kfree(tctx); |
8567 | tsk->io_uring = NULL; | |
8568 | } | |
8569 | ||
c072481d PB |
8570 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
8571 | struct io_uring_params *p) | |
2b188cc1 JA |
8572 | { |
8573 | int ret; | |
8574 | ||
d25e3a3d JA |
8575 | /* Retain compatibility with failing for an invalid attach attempt */ |
8576 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8577 | IORING_SETUP_ATTACH_WQ) { | |
8578 | struct fd f; | |
8579 | ||
8580 | f = fdget(p->wq_fd); | |
8581 | if (!f.file) | |
8582 | return -ENXIO; | |
0cc936f7 JA |
8583 | if (f.file->f_op != &io_uring_fops) { |
8584 | fdput(f); | |
f2a48dd0 | 8585 | return -EINVAL; |
0cc936f7 JA |
8586 | } |
8587 | fdput(f); | |
d25e3a3d | 8588 | } |
6c271ce2 | 8589 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8590 | struct task_struct *tsk; |
534ca6d6 | 8591 | struct io_sq_data *sqd; |
26984fbf | 8592 | bool attached; |
534ca6d6 | 8593 | |
26984fbf | 8594 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8595 | if (IS_ERR(sqd)) { |
8596 | ret = PTR_ERR(sqd); | |
8597 | goto err; | |
8598 | } | |
69fb2131 | 8599 | |
7c30f36a | 8600 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8601 | ctx->sq_data = sqd; |
917257da JA |
8602 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8603 | if (!ctx->sq_thread_idle) | |
8604 | ctx->sq_thread_idle = HZ; | |
8605 | ||
78d7f6ba | 8606 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8607 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8608 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8609 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8610 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8611 | io_sq_thread_unpark(sqd); |
8612 | ||
de75a3d3 PB |
8613 | if (ret < 0) |
8614 | goto err; | |
8615 | if (attached) | |
5aa75ed5 | 8616 | return 0; |
aa06165d | 8617 | |
6c271ce2 | 8618 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8619 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8620 | |
917257da | 8621 | ret = -EINVAL; |
f2a48dd0 | 8622 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8623 | goto err_sqpoll; |
37d1e2e3 | 8624 | sqd->sq_cpu = cpu; |
6c271ce2 | 8625 | } else { |
37d1e2e3 | 8626 | sqd->sq_cpu = -1; |
6c271ce2 | 8627 | } |
37d1e2e3 JA |
8628 | |
8629 | sqd->task_pid = current->pid; | |
5c2469e0 | 8630 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8631 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8632 | if (IS_ERR(tsk)) { | |
8633 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8634 | goto err_sqpoll; |
6c271ce2 | 8635 | } |
97a73a0f | 8636 | |
46fe18b1 | 8637 | sqd->thread = tsk; |
97a73a0f | 8638 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8639 | wake_up_new_task(tsk); |
0f212204 JA |
8640 | if (ret) |
8641 | goto err; | |
6c271ce2 JA |
8642 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8643 | /* Can't have SQ_AFF without SQPOLL */ | |
8644 | ret = -EINVAL; | |
8645 | goto err; | |
8646 | } | |
8647 | ||
2b188cc1 | 8648 | return 0; |
f2a48dd0 PB |
8649 | err_sqpoll: |
8650 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8651 | err: |
37d1e2e3 | 8652 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8653 | return ret; |
8654 | } | |
8655 | ||
a087e2b5 BM |
8656 | static inline void __io_unaccount_mem(struct user_struct *user, |
8657 | unsigned long nr_pages) | |
2b188cc1 JA |
8658 | { |
8659 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8660 | } | |
8661 | ||
a087e2b5 BM |
8662 | static inline int __io_account_mem(struct user_struct *user, |
8663 | unsigned long nr_pages) | |
2b188cc1 JA |
8664 | { |
8665 | unsigned long page_limit, cur_pages, new_pages; | |
8666 | ||
8667 | /* Don't allow more pages than we can safely lock */ | |
8668 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8669 | ||
8670 | do { | |
8671 | cur_pages = atomic_long_read(&user->locked_vm); | |
8672 | new_pages = cur_pages + nr_pages; | |
8673 | if (new_pages > page_limit) | |
8674 | return -ENOMEM; | |
8675 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8676 | new_pages) != cur_pages); | |
8677 | ||
8678 | return 0; | |
8679 | } | |
8680 | ||
26bfa89e | 8681 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8682 | { |
62e398be | 8683 | if (ctx->user) |
a087e2b5 | 8684 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8685 | |
26bfa89e JA |
8686 | if (ctx->mm_account) |
8687 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8688 | } |
8689 | ||
26bfa89e | 8690 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8691 | { |
30975825 BM |
8692 | int ret; |
8693 | ||
62e398be | 8694 | if (ctx->user) { |
30975825 BM |
8695 | ret = __io_account_mem(ctx->user, nr_pages); |
8696 | if (ret) | |
8697 | return ret; | |
8698 | } | |
8699 | ||
26bfa89e JA |
8700 | if (ctx->mm_account) |
8701 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8702 | |
8703 | return 0; | |
8704 | } | |
8705 | ||
2b188cc1 JA |
8706 | static void io_mem_free(void *ptr) |
8707 | { | |
52e04ef4 MR |
8708 | struct page *page; |
8709 | ||
8710 | if (!ptr) | |
8711 | return; | |
2b188cc1 | 8712 | |
52e04ef4 | 8713 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8714 | if (put_page_testzero(page)) |
8715 | free_compound_page(page); | |
8716 | } | |
8717 | ||
8718 | static void *io_mem_alloc(size_t size) | |
8719 | { | |
8720 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8721 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8722 | |
8723 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8724 | } | |
8725 | ||
75b28aff HV |
8726 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8727 | size_t *sq_offset) | |
8728 | { | |
8729 | struct io_rings *rings; | |
8730 | size_t off, sq_array_size; | |
8731 | ||
8732 | off = struct_size(rings, cqes, cq_entries); | |
8733 | if (off == SIZE_MAX) | |
8734 | return SIZE_MAX; | |
8735 | ||
8736 | #ifdef CONFIG_SMP | |
8737 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8738 | if (off == 0) | |
8739 | return SIZE_MAX; | |
8740 | #endif | |
8741 | ||
b36200f5 DV |
8742 | if (sq_offset) |
8743 | *sq_offset = off; | |
8744 | ||
75b28aff HV |
8745 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8746 | if (sq_array_size == SIZE_MAX) | |
8747 | return SIZE_MAX; | |
8748 | ||
8749 | if (check_add_overflow(off, sq_array_size, &off)) | |
8750 | return SIZE_MAX; | |
8751 | ||
75b28aff HV |
8752 | return off; |
8753 | } | |
8754 | ||
41edf1a5 | 8755 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8756 | { |
41edf1a5 | 8757 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8758 | unsigned int i; |
8759 | ||
6224843d PB |
8760 | if (imu != ctx->dummy_ubuf) { |
8761 | for (i = 0; i < imu->nr_bvecs; i++) | |
8762 | unpin_user_page(imu->bvec[i].bv_page); | |
8763 | if (imu->acct_pages) | |
8764 | io_unaccount_mem(ctx, imu->acct_pages); | |
8765 | kvfree(imu); | |
8766 | } | |
41edf1a5 | 8767 | *slot = NULL; |
7f61a1e9 PB |
8768 | } |
8769 | ||
bd54b6fe | 8770 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8771 | { |
634d00df PB |
8772 | io_buffer_unmap(ctx, &prsrc->buf); |
8773 | prsrc->buf = NULL; | |
bd54b6fe | 8774 | } |
edafccee | 8775 | |
bd54b6fe BM |
8776 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8777 | { | |
8778 | unsigned int i; | |
edafccee | 8779 | |
7f61a1e9 PB |
8780 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8781 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8782 | kfree(ctx->user_bufs); |
bb6659cc | 8783 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8784 | ctx->user_bufs = NULL; |
bd54b6fe | 8785 | ctx->buf_data = NULL; |
edafccee | 8786 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8787 | } |
8788 | ||
0a96bbe4 | 8789 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8790 | { |
bd54b6fe | 8791 | int ret; |
edafccee | 8792 | |
bd54b6fe | 8793 | if (!ctx->buf_data) |
edafccee JA |
8794 | return -ENXIO; |
8795 | ||
bd54b6fe BM |
8796 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8797 | if (!ret) | |
8798 | __io_sqe_buffers_unregister(ctx); | |
8799 | return ret; | |
edafccee JA |
8800 | } |
8801 | ||
8802 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8803 | void __user *arg, unsigned index) | |
8804 | { | |
8805 | struct iovec __user *src; | |
8806 | ||
8807 | #ifdef CONFIG_COMPAT | |
8808 | if (ctx->compat) { | |
8809 | struct compat_iovec __user *ciovs; | |
8810 | struct compat_iovec ciov; | |
8811 | ||
8812 | ciovs = (struct compat_iovec __user *) arg; | |
8813 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8814 | return -EFAULT; | |
8815 | ||
d55e5f5b | 8816 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8817 | dst->iov_len = ciov.iov_len; |
8818 | return 0; | |
8819 | } | |
8820 | #endif | |
8821 | src = (struct iovec __user *) arg; | |
8822 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8823 | return -EFAULT; | |
8824 | return 0; | |
8825 | } | |
8826 | ||
de293938 JA |
8827 | /* |
8828 | * Not super efficient, but this is just a registration time. And we do cache | |
8829 | * the last compound head, so generally we'll only do a full search if we don't | |
8830 | * match that one. | |
8831 | * | |
8832 | * We check if the given compound head page has already been accounted, to | |
8833 | * avoid double accounting it. This allows us to account the full size of the | |
8834 | * page, not just the constituent pages of a huge page. | |
8835 | */ | |
8836 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8837 | int nr_pages, struct page *hpage) | |
8838 | { | |
8839 | int i, j; | |
8840 | ||
8841 | /* check current page array */ | |
8842 | for (i = 0; i < nr_pages; i++) { | |
8843 | if (!PageCompound(pages[i])) | |
8844 | continue; | |
8845 | if (compound_head(pages[i]) == hpage) | |
8846 | return true; | |
8847 | } | |
8848 | ||
8849 | /* check previously registered pages */ | |
8850 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8851 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8852 | |
8853 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8854 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8855 | continue; | |
8856 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8857 | return true; | |
8858 | } | |
8859 | } | |
8860 | ||
8861 | return false; | |
8862 | } | |
8863 | ||
8864 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8865 | int nr_pages, struct io_mapped_ubuf *imu, | |
8866 | struct page **last_hpage) | |
8867 | { | |
8868 | int i, ret; | |
8869 | ||
216e5835 | 8870 | imu->acct_pages = 0; |
de293938 JA |
8871 | for (i = 0; i < nr_pages; i++) { |
8872 | if (!PageCompound(pages[i])) { | |
8873 | imu->acct_pages++; | |
8874 | } else { | |
8875 | struct page *hpage; | |
8876 | ||
8877 | hpage = compound_head(pages[i]); | |
8878 | if (hpage == *last_hpage) | |
8879 | continue; | |
8880 | *last_hpage = hpage; | |
8881 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8882 | continue; | |
8883 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8884 | } | |
8885 | } | |
8886 | ||
8887 | if (!imu->acct_pages) | |
8888 | return 0; | |
8889 | ||
26bfa89e | 8890 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8891 | if (ret) |
8892 | imu->acct_pages = 0; | |
8893 | return ret; | |
8894 | } | |
8895 | ||
0a96bbe4 | 8896 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8897 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8898 | struct page **last_hpage) |
edafccee | 8899 | { |
41edf1a5 | 8900 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8901 | struct vm_area_struct **vmas = NULL; |
8902 | struct page **pages = NULL; | |
0a96bbe4 BM |
8903 | unsigned long off, start, end, ubuf; |
8904 | size_t size; | |
8905 | int ret, pret, nr_pages, i; | |
8906 | ||
6224843d PB |
8907 | if (!iov->iov_base) { |
8908 | *pimu = ctx->dummy_ubuf; | |
8909 | return 0; | |
8910 | } | |
8911 | ||
0a96bbe4 BM |
8912 | ubuf = (unsigned long) iov->iov_base; |
8913 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8914 | start = ubuf >> PAGE_SHIFT; | |
8915 | nr_pages = end - start; | |
8916 | ||
41edf1a5 | 8917 | *pimu = NULL; |
0a96bbe4 BM |
8918 | ret = -ENOMEM; |
8919 | ||
8920 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8921 | if (!pages) | |
8922 | goto done; | |
8923 | ||
8924 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8925 | GFP_KERNEL); | |
8926 | if (!vmas) | |
8927 | goto done; | |
edafccee | 8928 | |
41edf1a5 | 8929 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8930 | if (!imu) |
0a96bbe4 BM |
8931 | goto done; |
8932 | ||
8933 | ret = 0; | |
8934 | mmap_read_lock(current->mm); | |
8935 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8936 | pages, vmas); | |
8937 | if (pret == nr_pages) { | |
8938 | /* don't support file backed memory */ | |
8939 | for (i = 0; i < nr_pages; i++) { | |
8940 | struct vm_area_struct *vma = vmas[i]; | |
8941 | ||
40dad765 PB |
8942 | if (vma_is_shmem(vma)) |
8943 | continue; | |
0a96bbe4 BM |
8944 | if (vma->vm_file && |
8945 | !is_file_hugepages(vma->vm_file)) { | |
8946 | ret = -EOPNOTSUPP; | |
8947 | break; | |
8948 | } | |
8949 | } | |
8950 | } else { | |
8951 | ret = pret < 0 ? pret : -EFAULT; | |
8952 | } | |
8953 | mmap_read_unlock(current->mm); | |
8954 | if (ret) { | |
8955 | /* | |
8956 | * if we did partial map, or found file backed vmas, | |
8957 | * release any pages we did get | |
8958 | */ | |
8959 | if (pret > 0) | |
8960 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8961 | goto done; |
8962 | } | |
8963 | ||
8964 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8965 | if (ret) { | |
8966 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8967 | goto done; |
8968 | } | |
8969 | ||
8970 | off = ubuf & ~PAGE_MASK; | |
8971 | size = iov->iov_len; | |
8972 | for (i = 0; i < nr_pages; i++) { | |
8973 | size_t vec_len; | |
8974 | ||
8975 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8976 | imu->bvec[i].bv_page = pages[i]; | |
8977 | imu->bvec[i].bv_len = vec_len; | |
8978 | imu->bvec[i].bv_offset = off; | |
8979 | off = 0; | |
8980 | size -= vec_len; | |
8981 | } | |
8982 | /* store original address for later verification */ | |
8983 | imu->ubuf = ubuf; | |
4751f53d | 8984 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 8985 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 8986 | *pimu = imu; |
0a96bbe4 BM |
8987 | ret = 0; |
8988 | done: | |
41edf1a5 PB |
8989 | if (ret) |
8990 | kvfree(imu); | |
0a96bbe4 BM |
8991 | kvfree(pages); |
8992 | kvfree(vmas); | |
8993 | return ret; | |
8994 | } | |
8995 | ||
2b358604 | 8996 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8997 | { |
87094465 PB |
8998 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
8999 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9000 | } |
edafccee | 9001 | |
2b358604 BM |
9002 | static int io_buffer_validate(struct iovec *iov) |
9003 | { | |
50e96989 PB |
9004 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9005 | ||
2b358604 BM |
9006 | /* |
9007 | * Don't impose further limits on the size and buffer | |
9008 | * constraints here, we'll -EINVAL later when IO is | |
9009 | * submitted if they are wrong. | |
9010 | */ | |
6224843d PB |
9011 | if (!iov->iov_base) |
9012 | return iov->iov_len ? -EFAULT : 0; | |
9013 | if (!iov->iov_len) | |
2b358604 | 9014 | return -EFAULT; |
edafccee | 9015 | |
2b358604 BM |
9016 | /* arbitrary limit, but we need something */ |
9017 | if (iov->iov_len > SZ_1G) | |
9018 | return -EFAULT; | |
edafccee | 9019 | |
50e96989 PB |
9020 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9021 | return -EOVERFLOW; | |
9022 | ||
2b358604 BM |
9023 | return 0; |
9024 | } | |
edafccee | 9025 | |
2b358604 | 9026 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9027 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9028 | { |
bd54b6fe BM |
9029 | struct page *last_hpage = NULL; |
9030 | struct io_rsrc_data *data; | |
2b358604 BM |
9031 | int i, ret; |
9032 | struct iovec iov; | |
edafccee | 9033 | |
87094465 PB |
9034 | if (ctx->user_bufs) |
9035 | return -EBUSY; | |
489809e2 | 9036 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9037 | return -EINVAL; |
bd54b6fe | 9038 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9039 | if (ret) |
9040 | return ret; | |
d878c816 PB |
9041 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9042 | if (ret) | |
9043 | return ret; | |
bd54b6fe BM |
9044 | ret = io_buffers_map_alloc(ctx, nr_args); |
9045 | if (ret) { | |
bb6659cc | 9046 | io_rsrc_data_free(data); |
bd54b6fe BM |
9047 | return ret; |
9048 | } | |
edafccee | 9049 | |
87094465 | 9050 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9051 | ret = io_copy_iov(ctx, &iov, arg, i); |
9052 | if (ret) | |
0a96bbe4 | 9053 | break; |
2b358604 BM |
9054 | ret = io_buffer_validate(&iov); |
9055 | if (ret) | |
0a96bbe4 | 9056 | break; |
2d091d62 | 9057 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9058 | ret = -EINVAL; |
9059 | break; | |
9060 | } | |
edafccee | 9061 | |
41edf1a5 PB |
9062 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9063 | &last_hpage); | |
0a96bbe4 BM |
9064 | if (ret) |
9065 | break; | |
edafccee | 9066 | } |
0a96bbe4 | 9067 | |
bd54b6fe | 9068 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9069 | |
bd54b6fe BM |
9070 | ctx->buf_data = data; |
9071 | if (ret) | |
9072 | __io_sqe_buffers_unregister(ctx); | |
9073 | else | |
9074 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9075 | return ret; |
9076 | } | |
9077 | ||
634d00df PB |
9078 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9079 | struct io_uring_rsrc_update2 *up, | |
9080 | unsigned int nr_args) | |
9081 | { | |
9082 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9083 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9084 | struct page *last_hpage = NULL; |
9085 | bool needs_switch = false; | |
9086 | __u32 done; | |
9087 | int i, err; | |
9088 | ||
9089 | if (!ctx->buf_data) | |
9090 | return -ENXIO; | |
9091 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9092 | return -EINVAL; | |
9093 | ||
9094 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9095 | struct io_mapped_ubuf *imu; |
9096 | int offset = up->offset + done; | |
634d00df PB |
9097 | u64 tag = 0; |
9098 | ||
9099 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9100 | if (err) | |
9101 | break; | |
9102 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9103 | err = -EFAULT; | |
9104 | break; | |
9105 | } | |
0b8c0e7c PB |
9106 | err = io_buffer_validate(&iov); |
9107 | if (err) | |
9108 | break; | |
cf3770e7 CIK |
9109 | if (!iov.iov_base && tag) { |
9110 | err = -EINVAL; | |
9111 | break; | |
9112 | } | |
0b8c0e7c PB |
9113 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9114 | if (err) | |
9115 | break; | |
634d00df | 9116 | |
0b8c0e7c | 9117 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9118 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
9119 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
9120 | ctx->rsrc_node, ctx->user_bufs[i]); | |
9121 | if (unlikely(err)) { | |
9122 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9123 | break; |
0b8c0e7c | 9124 | } |
634d00df PB |
9125 | ctx->user_bufs[i] = NULL; |
9126 | needs_switch = true; | |
9127 | } | |
9128 | ||
0b8c0e7c | 9129 | ctx->user_bufs[i] = imu; |
2d091d62 | 9130 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9131 | } |
9132 | ||
9133 | if (needs_switch) | |
9134 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9135 | return done ? done : err; | |
9136 | } | |
9137 | ||
9b402849 JA |
9138 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
9139 | { | |
9140 | __s32 __user *fds = arg; | |
9141 | int fd; | |
9142 | ||
9143 | if (ctx->cq_ev_fd) | |
9144 | return -EBUSY; | |
9145 | ||
9146 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9147 | return -EFAULT; | |
9148 | ||
9149 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
9150 | if (IS_ERR(ctx->cq_ev_fd)) { | |
9151 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 9152 | |
9b402849 JA |
9153 | ctx->cq_ev_fd = NULL; |
9154 | return ret; | |
9155 | } | |
9156 | ||
9157 | return 0; | |
9158 | } | |
9159 | ||
9160 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9161 | { | |
9162 | if (ctx->cq_ev_fd) { | |
9163 | eventfd_ctx_put(ctx->cq_ev_fd); | |
9164 | ctx->cq_ev_fd = NULL; | |
9165 | return 0; | |
9166 | } | |
9167 | ||
9168 | return -ENXIO; | |
9169 | } | |
9170 | ||
5a2e745d JA |
9171 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9172 | { | |
9e15c3a0 JA |
9173 | struct io_buffer *buf; |
9174 | unsigned long index; | |
9175 | ||
8bab4c09 | 9176 | xa_for_each(&ctx->io_buffers, index, buf) { |
9e15c3a0 | 9177 | __io_remove_buffers(ctx, buf, index, -1U); |
8bab4c09 JA |
9178 | cond_resched(); |
9179 | } | |
5a2e745d JA |
9180 | } |
9181 | ||
4010fec4 | 9182 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9183 | { |
cd0ca2e0 | 9184 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 9185 | int nr = 0; |
bf019da7 | 9186 | |
9a4fdbd8 | 9187 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 9188 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc PB |
9189 | |
9190 | while (state->free_list.next) { | |
9191 | struct io_wq_work_node *node; | |
9192 | struct io_kiocb *req; | |
9193 | ||
9194 | node = wq_stack_extract(&state->free_list); | |
9195 | req = container_of(node, struct io_kiocb, comp_list); | |
9196 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 9197 | nr++; |
c2b6c6bc | 9198 | } |
37f0e767 PB |
9199 | if (nr) |
9200 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
9201 | mutex_unlock(&ctx->uring_lock); |
9202 | } | |
9203 | ||
43597aac | 9204 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9205 | { |
43597aac | 9206 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9207 | wait_for_completion(&data->done); |
bd54b6fe | 9208 | } |
04fc6c80 | 9209 | |
c072481d | 9210 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9211 | { |
37d1e2e3 | 9212 | io_sq_thread_finish(ctx); |
2aede0e4 | 9213 | |
37d1e2e3 | 9214 | if (ctx->mm_account) { |
2aede0e4 JA |
9215 | mmdrop(ctx->mm_account); |
9216 | ctx->mm_account = NULL; | |
30975825 | 9217 | } |
def596e9 | 9218 | |
ab409402 | 9219 | io_rsrc_refs_drop(ctx); |
43597aac PB |
9220 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9221 | io_wait_rsrc_data(ctx->buf_data); | |
9222 | io_wait_rsrc_data(ctx->file_data); | |
9223 | ||
8bad28d8 | 9224 | mutex_lock(&ctx->uring_lock); |
43597aac | 9225 | if (ctx->buf_data) |
bd54b6fe | 9226 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9227 | if (ctx->file_data) |
08480400 | 9228 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9229 | if (ctx->rings) |
9230 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 9231 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 9232 | io_eventfd_unregister(ctx); |
5a2e745d | 9233 | io_destroy_buffers(ctx); |
07db298a PB |
9234 | if (ctx->sq_creds) |
9235 | put_cred(ctx->sq_creds); | |
def596e9 | 9236 | |
a7f0ed5a PB |
9237 | /* there are no registered resources left, nobody uses it */ |
9238 | if (ctx->rsrc_node) | |
9239 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9240 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9241 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 9242 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 9243 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
9244 | |
9245 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9246 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9247 | |
2b188cc1 | 9248 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9249 | if (ctx->ring_sock) { |
9250 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9251 | sock_release(ctx->ring_sock); |
355e8d26 | 9252 | } |
2b188cc1 | 9253 | #endif |
ef9dd637 | 9254 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9255 | |
75b28aff | 9256 | io_mem_free(ctx->rings); |
2b188cc1 | 9257 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9258 | |
9259 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9260 | free_uid(ctx->user); |
4010fec4 | 9261 | io_req_caches_free(ctx); |
e941894e JA |
9262 | if (ctx->hash_map) |
9263 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9264 | kfree(ctx->cancel_hash); |
6224843d | 9265 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
9266 | kfree(ctx); |
9267 | } | |
9268 | ||
9269 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9270 | { | |
9271 | struct io_ring_ctx *ctx = file->private_data; | |
9272 | __poll_t mask = 0; | |
9273 | ||
d60aa65b | 9274 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
9275 | /* |
9276 | * synchronizes with barrier from wq_has_sleeper call in | |
9277 | * io_commit_cqring | |
9278 | */ | |
2b188cc1 | 9279 | smp_rmb(); |
90554200 | 9280 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9281 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9282 | |
9283 | /* | |
9284 | * Don't flush cqring overflow list here, just do a simple check. | |
9285 | * Otherwise there could possible be ABBA deadlock: | |
9286 | * CPU0 CPU1 | |
9287 | * ---- ---- | |
9288 | * lock(&ctx->uring_lock); | |
9289 | * lock(&ep->mtx); | |
9290 | * lock(&ctx->uring_lock); | |
9291 | * lock(&ep->mtx); | |
9292 | * | |
9293 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9294 | * pushs them to do the flush. | |
9295 | */ | |
5ed7a37d | 9296 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9297 | mask |= EPOLLIN | EPOLLRDNORM; |
9298 | ||
9299 | return mask; | |
9300 | } | |
9301 | ||
0bead8cd | 9302 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9303 | { |
4379bf8b | 9304 | const struct cred *creds; |
071698e1 | 9305 | |
61cf9370 | 9306 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9307 | if (creds) { |
9308 | put_cred(creds); | |
0bead8cd | 9309 | return 0; |
1e6fa521 | 9310 | } |
0bead8cd YD |
9311 | |
9312 | return -EINVAL; | |
9313 | } | |
9314 | ||
d56d938b PB |
9315 | struct io_tctx_exit { |
9316 | struct callback_head task_work; | |
9317 | struct completion completion; | |
baf186c4 | 9318 | struct io_ring_ctx *ctx; |
d56d938b PB |
9319 | }; |
9320 | ||
c072481d | 9321 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
9322 | { |
9323 | struct io_uring_task *tctx = current->io_uring; | |
9324 | struct io_tctx_exit *work; | |
9325 | ||
9326 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9327 | /* | |
9328 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9329 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9330 | */ | |
9331 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9332 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9333 | complete(&work->completion); |
9334 | } | |
9335 | ||
c072481d | 9336 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
9337 | { |
9338 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9339 | ||
9340 | return req->ctx == data; | |
9341 | } | |
9342 | ||
c072481d | 9343 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 9344 | { |
d56d938b | 9345 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9346 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9347 | unsigned long interval = HZ / 20; |
d56d938b PB |
9348 | struct io_tctx_exit exit; |
9349 | struct io_tctx_node *node; | |
9350 | int ret; | |
85faa7b8 | 9351 | |
56952e91 JA |
9352 | /* |
9353 | * If we're doing polled IO and end up having requests being | |
9354 | * submitted async (out-of-line), then completions can come in while | |
9355 | * we're waiting for refs to drop. We need to reap these manually, | |
9356 | * as nobody else will be looking for them. | |
9357 | */ | |
b2edc0a7 | 9358 | do { |
3dd0c97a | 9359 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9360 | if (ctx->sq_data) { |
9361 | struct io_sq_data *sqd = ctx->sq_data; | |
9362 | struct task_struct *tsk; | |
9363 | ||
9364 | io_sq_thread_park(sqd); | |
9365 | tsk = sqd->thread; | |
9366 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9367 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9368 | io_cancel_ctx_cb, ctx, true); | |
9369 | io_sq_thread_unpark(sqd); | |
9370 | } | |
b5bb3a24 | 9371 | |
37f0e767 PB |
9372 | io_req_caches_free(ctx); |
9373 | ||
58d3be2c PB |
9374 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9375 | /* there is little hope left, don't run it too often */ | |
9376 | interval = HZ * 60; | |
9377 | } | |
9378 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9379 | |
7f00651a PB |
9380 | init_completion(&exit.completion); |
9381 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9382 | exit.ctx = ctx; | |
89b5066e PB |
9383 | /* |
9384 | * Some may use context even when all refs and requests have been put, | |
9385 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9386 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9387 | * this lock/unlock section also waits them to finish. |
9388 | */ | |
d56d938b PB |
9389 | mutex_lock(&ctx->uring_lock); |
9390 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9391 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9392 | ||
d56d938b PB |
9393 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9394 | ctx_node); | |
7f00651a PB |
9395 | /* don't spin on a single task if cancellation failed */ |
9396 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9397 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9398 | if (WARN_ON_ONCE(ret)) | |
9399 | continue; | |
d56d938b PB |
9400 | |
9401 | mutex_unlock(&ctx->uring_lock); | |
9402 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9403 | mutex_lock(&ctx->uring_lock); |
9404 | } | |
9405 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9406 | spin_lock(&ctx->completion_lock); |
9407 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9408 | |
85faa7b8 JA |
9409 | io_ring_ctx_free(ctx); |
9410 | } | |
9411 | ||
80c4cbdb | 9412 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
9413 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
9414 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
9415 | { |
9416 | struct io_kiocb *req, *tmp; | |
9417 | int canceled = 0; | |
9418 | ||
79ebeaee JA |
9419 | spin_lock(&ctx->completion_lock); |
9420 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9421 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9422 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9423 | io_kill_timeout(req, -ECANCELED); |
9424 | canceled++; | |
9425 | } | |
9426 | } | |
79ebeaee | 9427 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9428 | if (canceled != 0) |
9429 | io_commit_cqring(ctx); | |
79ebeaee | 9430 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9431 | if (canceled != 0) |
9432 | io_cqring_ev_posted(ctx); | |
9433 | return canceled != 0; | |
9434 | } | |
9435 | ||
c072481d | 9436 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 9437 | { |
61cf9370 MWO |
9438 | unsigned long index; |
9439 | struct creds *creds; | |
9440 | ||
2b188cc1 JA |
9441 | mutex_lock(&ctx->uring_lock); |
9442 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9443 | if (ctx->rings) |
6c2450ae | 9444 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9445 | xa_for_each(&ctx->personalities, index, creds) |
9446 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9447 | mutex_unlock(&ctx->uring_lock); |
9448 | ||
3dd0c97a PB |
9449 | io_kill_timeouts(ctx, NULL, true); |
9450 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9451 | |
15dff286 | 9452 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9453 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9454 | |
85faa7b8 | 9455 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9456 | /* |
9457 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9458 | * if we're exiting a ton of rings at the same time. It just adds | |
9459 | * noise and overhead, there's no discernable change in runtime | |
9460 | * over using system_wq. | |
9461 | */ | |
9462 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9463 | } |
9464 | ||
9465 | static int io_uring_release(struct inode *inode, struct file *file) | |
9466 | { | |
9467 | struct io_ring_ctx *ctx = file->private_data; | |
9468 | ||
9469 | file->private_data = NULL; | |
9470 | io_ring_ctx_wait_and_kill(ctx); | |
9471 | return 0; | |
9472 | } | |
9473 | ||
f6edbabb PB |
9474 | struct io_task_cancel { |
9475 | struct task_struct *task; | |
3dd0c97a | 9476 | bool all; |
f6edbabb | 9477 | }; |
f254ac04 | 9478 | |
f6edbabb | 9479 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9480 | { |
9a472ef7 | 9481 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9482 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
9483 | bool ret; |
9484 | ||
3dd0c97a | 9485 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
9486 | struct io_ring_ctx *ctx = req->ctx; |
9487 | ||
9488 | /* protect against races with linked timeouts */ | |
79ebeaee | 9489 | spin_lock(&ctx->completion_lock); |
3dd0c97a | 9490 | ret = io_match_task(req, cancel->task, cancel->all); |
79ebeaee | 9491 | spin_unlock(&ctx->completion_lock); |
9a472ef7 | 9492 | } else { |
3dd0c97a | 9493 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
9494 | } |
9495 | return ret; | |
b711d4ea JA |
9496 | } |
9497 | ||
c072481d PB |
9498 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
9499 | struct task_struct *task, | |
9500 | bool cancel_all) | |
b7ddce3c | 9501 | { |
e1915f76 | 9502 | struct io_defer_entry *de; |
b7ddce3c PB |
9503 | LIST_HEAD(list); |
9504 | ||
79ebeaee | 9505 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9506 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
3dd0c97a | 9507 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
9508 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9509 | break; | |
9510 | } | |
9511 | } | |
79ebeaee | 9512 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9513 | if (list_empty(&list)) |
9514 | return false; | |
b7ddce3c PB |
9515 | |
9516 | while (!list_empty(&list)) { | |
9517 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9518 | list_del_init(&de->list); | |
f41db273 | 9519 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9520 | kfree(de); |
9521 | } | |
e1915f76 | 9522 | return true; |
b7ddce3c PB |
9523 | } |
9524 | ||
c072481d | 9525 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
9526 | { |
9527 | struct io_tctx_node *node; | |
9528 | enum io_wq_cancel cret; | |
9529 | bool ret = false; | |
9530 | ||
9531 | mutex_lock(&ctx->uring_lock); | |
9532 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9533 | struct io_uring_task *tctx = node->task->io_uring; | |
9534 | ||
9535 | /* | |
9536 | * io_wq will stay alive while we hold uring_lock, because it's | |
9537 | * killed after ctx nodes, which requires to take the lock. | |
9538 | */ | |
9539 | if (!tctx || !tctx->io_wq) | |
9540 | continue; | |
9541 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9542 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9543 | } | |
9544 | mutex_unlock(&ctx->uring_lock); | |
9545 | ||
9546 | return ret; | |
9547 | } | |
9548 | ||
c072481d PB |
9549 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9550 | struct task_struct *task, | |
9551 | bool cancel_all) | |
9936c7c2 | 9552 | { |
3dd0c97a | 9553 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9554 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9555 | |
9556 | while (1) { | |
9557 | enum io_wq_cancel cret; | |
9558 | bool ret = false; | |
9559 | ||
1b00764f PB |
9560 | if (!task) { |
9561 | ret |= io_uring_try_cancel_iowq(ctx); | |
9562 | } else if (tctx && tctx->io_wq) { | |
9563 | /* | |
9564 | * Cancels requests of all rings, not only @ctx, but | |
9565 | * it's fine as the task is in exit/exec. | |
9566 | */ | |
5aa75ed5 | 9567 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9568 | &cancel, true); |
9569 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9570 | } | |
9571 | ||
9572 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9573 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9574 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 9575 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
9576 | io_iopoll_try_reap_events(ctx); |
9577 | ret = true; | |
9578 | } | |
9579 | } | |
9580 | ||
3dd0c97a PB |
9581 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9582 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9583 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9584 | if (task) |
9585 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9586 | if (!ret) |
9587 | break; | |
9588 | cond_resched(); | |
9589 | } | |
9590 | } | |
9591 | ||
eef51daa | 9592 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9593 | { |
236434c3 | 9594 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9595 | struct io_tctx_node *node; |
a528b04e | 9596 | int ret; |
236434c3 MWO |
9597 | |
9598 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9599 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9600 | if (unlikely(ret)) |
9601 | return ret; | |
236434c3 | 9602 | tctx = current->io_uring; |
0f212204 | 9603 | } |
cf27f3b1 PB |
9604 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9605 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9606 | if (!node) | |
9607 | return -ENOMEM; | |
9608 | node->ctx = ctx; | |
9609 | node->task = current; | |
13bf43f5 | 9610 | |
cf27f3b1 PB |
9611 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9612 | node, GFP_KERNEL)); | |
9613 | if (ret) { | |
9614 | kfree(node); | |
9615 | return ret; | |
0f212204 | 9616 | } |
cf27f3b1 PB |
9617 | |
9618 | mutex_lock(&ctx->uring_lock); | |
9619 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9620 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9621 | } |
cf27f3b1 | 9622 | tctx->last = ctx; |
0f212204 JA |
9623 | return 0; |
9624 | } | |
9625 | ||
cf27f3b1 PB |
9626 | /* |
9627 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9628 | */ | |
eef51daa | 9629 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9630 | { |
9631 | struct io_uring_task *tctx = current->io_uring; | |
9632 | ||
9633 | if (likely(tctx && tctx->last == ctx)) | |
9634 | return 0; | |
eef51daa | 9635 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9636 | } |
9637 | ||
0f212204 JA |
9638 | /* |
9639 | * Remove this io_uring_file -> task mapping. | |
9640 | */ | |
c072481d | 9641 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9642 | { |
9643 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9644 | struct io_tctx_node *node; |
2941267b | 9645 | |
eebd2e37 PB |
9646 | if (!tctx) |
9647 | return; | |
13bf43f5 PB |
9648 | node = xa_erase(&tctx->xa, index); |
9649 | if (!node) | |
2941267b | 9650 | return; |
0f212204 | 9651 | |
13bf43f5 PB |
9652 | WARN_ON_ONCE(current != node->task); |
9653 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9654 | ||
9655 | mutex_lock(&node->ctx->uring_lock); | |
9656 | list_del(&node->ctx_node); | |
9657 | mutex_unlock(&node->ctx->uring_lock); | |
9658 | ||
baf186c4 | 9659 | if (tctx->last == node->ctx) |
0f212204 | 9660 | tctx->last = NULL; |
13bf43f5 | 9661 | kfree(node); |
0f212204 JA |
9662 | } |
9663 | ||
c072481d | 9664 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9665 | { |
ba5ef6dc | 9666 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9667 | struct io_tctx_node *node; |
de7f1d9e PB |
9668 | unsigned long index; |
9669 | ||
8bab4c09 | 9670 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 9671 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
9672 | cond_resched(); |
9673 | } | |
b16ef427 ME |
9674 | if (wq) { |
9675 | /* | |
9676 | * Must be after io_uring_del_task_file() (removes nodes under | |
9677 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9678 | */ | |
ba5ef6dc | 9679 | io_wq_put_and_exit(wq); |
dadebc35 | 9680 | tctx->io_wq = NULL; |
b16ef427 | 9681 | } |
de7f1d9e PB |
9682 | } |
9683 | ||
3f48cf18 | 9684 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9685 | { |
3f48cf18 PB |
9686 | if (tracked) |
9687 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9688 | return percpu_counter_sum(&tctx->inflight); |
9689 | } | |
9690 | ||
c072481d | 9691 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
09899b19 PB |
9692 | { |
9693 | struct io_uring_task *tctx = task->io_uring; | |
9694 | unsigned int refs = tctx->cached_refs; | |
9695 | ||
e9dbe221 PB |
9696 | if (refs) { |
9697 | tctx->cached_refs = 0; | |
9698 | percpu_counter_sub(&tctx->inflight, refs); | |
9699 | put_task_struct_many(task, refs); | |
9700 | } | |
09899b19 PB |
9701 | } |
9702 | ||
78cc687b PB |
9703 | /* |
9704 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9705 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9706 | */ | |
c072481d PB |
9707 | static __cold void io_uring_cancel_generic(bool cancel_all, |
9708 | struct io_sq_data *sqd) | |
0e9ddb39 | 9709 | { |
521d6a73 | 9710 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9711 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9712 | s64 inflight; |
9713 | DEFINE_WAIT(wait); | |
fdaf083c | 9714 | |
78cc687b PB |
9715 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9716 | ||
6d042ffb PO |
9717 | if (!current->io_uring) |
9718 | return; | |
17a91051 PB |
9719 | if (tctx->io_wq) |
9720 | io_wq_exit_start(tctx->io_wq); | |
9721 | ||
0e9ddb39 PB |
9722 | atomic_inc(&tctx->in_idle); |
9723 | do { | |
e9dbe221 | 9724 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9725 | /* read completions before cancelations */ |
78cc687b | 9726 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9727 | if (!inflight) |
9728 | break; | |
fdaf083c | 9729 | |
78cc687b PB |
9730 | if (!sqd) { |
9731 | struct io_tctx_node *node; | |
9732 | unsigned long index; | |
0f212204 | 9733 | |
78cc687b PB |
9734 | xa_for_each(&tctx->xa, index, node) { |
9735 | /* sqpoll task will cancel all its requests */ | |
9736 | if (node->ctx->sq_data) | |
9737 | continue; | |
9738 | io_uring_try_cancel_requests(node->ctx, current, | |
9739 | cancel_all); | |
9740 | } | |
9741 | } else { | |
9742 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9743 | io_uring_try_cancel_requests(ctx, current, | |
9744 | cancel_all); | |
9745 | } | |
17a91051 | 9746 | |
0f212204 | 9747 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9748 | io_uring_drop_tctx_refs(current); |
0f212204 | 9749 | /* |
a1bb3cd5 PB |
9750 | * If we've seen completions, retry without waiting. This |
9751 | * avoids a race where a completion comes in before we did | |
9752 | * prepare_to_wait(). | |
0f212204 | 9753 | */ |
3dd0c97a | 9754 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9755 | schedule(); |
f57555ed | 9756 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9757 | } while (1); |
fdaf083c | 9758 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9759 | |
8452d4a6 | 9760 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9761 | if (cancel_all) { |
3f48cf18 PB |
9762 | /* for exec all current's requests should be gone, kill tctx */ |
9763 | __io_uring_free(current); | |
9764 | } | |
44e728b8 PB |
9765 | } |
9766 | ||
f552a27a | 9767 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9768 | { |
f552a27a | 9769 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9770 | } |
9771 | ||
6c5c240e RP |
9772 | static void *io_uring_validate_mmap_request(struct file *file, |
9773 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9774 | { |
2b188cc1 | 9775 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9776 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9777 | struct page *page; |
9778 | void *ptr; | |
9779 | ||
9780 | switch (offset) { | |
9781 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9782 | case IORING_OFF_CQ_RING: |
9783 | ptr = ctx->rings; | |
2b188cc1 JA |
9784 | break; |
9785 | case IORING_OFF_SQES: | |
9786 | ptr = ctx->sq_sqes; | |
9787 | break; | |
2b188cc1 | 9788 | default: |
6c5c240e | 9789 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9790 | } |
9791 | ||
9792 | page = virt_to_head_page(ptr); | |
a50b854e | 9793 | if (sz > page_size(page)) |
6c5c240e RP |
9794 | return ERR_PTR(-EINVAL); |
9795 | ||
9796 | return ptr; | |
9797 | } | |
9798 | ||
9799 | #ifdef CONFIG_MMU | |
9800 | ||
c072481d | 9801 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
9802 | { |
9803 | size_t sz = vma->vm_end - vma->vm_start; | |
9804 | unsigned long pfn; | |
9805 | void *ptr; | |
9806 | ||
9807 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9808 | if (IS_ERR(ptr)) | |
9809 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9810 | |
9811 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9812 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9813 | } | |
9814 | ||
6c5c240e RP |
9815 | #else /* !CONFIG_MMU */ |
9816 | ||
9817 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9818 | { | |
9819 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9820 | } | |
9821 | ||
9822 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9823 | { | |
9824 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9825 | } | |
9826 | ||
9827 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9828 | unsigned long addr, unsigned long len, | |
9829 | unsigned long pgoff, unsigned long flags) | |
9830 | { | |
9831 | void *ptr; | |
9832 | ||
9833 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9834 | if (IS_ERR(ptr)) | |
9835 | return PTR_ERR(ptr); | |
9836 | ||
9837 | return (unsigned long) ptr; | |
9838 | } | |
9839 | ||
9840 | #endif /* !CONFIG_MMU */ | |
9841 | ||
d9d05217 | 9842 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9843 | { |
9844 | DEFINE_WAIT(wait); | |
9845 | ||
9846 | do { | |
9847 | if (!io_sqring_full(ctx)) | |
9848 | break; | |
90554200 JA |
9849 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9850 | ||
9851 | if (!io_sqring_full(ctx)) | |
9852 | break; | |
90554200 JA |
9853 | schedule(); |
9854 | } while (!signal_pending(current)); | |
9855 | ||
9856 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9857 | return 0; |
90554200 JA |
9858 | } |
9859 | ||
c73ebb68 HX |
9860 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9861 | struct __kernel_timespec __user **ts, | |
9862 | const sigset_t __user **sig) | |
9863 | { | |
9864 | struct io_uring_getevents_arg arg; | |
9865 | ||
9866 | /* | |
9867 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9868 | * is just a pointer to the sigset_t. | |
9869 | */ | |
9870 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9871 | *sig = (const sigset_t __user *) argp; | |
9872 | *ts = NULL; | |
9873 | return 0; | |
9874 | } | |
9875 | ||
9876 | /* | |
9877 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9878 | * timespec and sigset_t pointers if good. | |
9879 | */ | |
9880 | if (*argsz != sizeof(arg)) | |
9881 | return -EINVAL; | |
9882 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9883 | return -EFAULT; | |
9884 | *sig = u64_to_user_ptr(arg.sigmask); | |
9885 | *argsz = arg.sigmask_sz; | |
9886 | *ts = u64_to_user_ptr(arg.ts); | |
9887 | return 0; | |
9888 | } | |
9889 | ||
2b188cc1 | 9890 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9891 | u32, min_complete, u32, flags, const void __user *, argp, |
9892 | size_t, argsz) | |
2b188cc1 JA |
9893 | { |
9894 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9895 | int submitted = 0; |
9896 | struct fd f; | |
33f993da | 9897 | long ret; |
2b188cc1 | 9898 | |
4c6e277c | 9899 | io_run_task_work(); |
b41e9852 | 9900 | |
33f993da PB |
9901 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9902 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9903 | return -EINVAL; |
9904 | ||
9905 | f = fdget(fd); | |
33f993da | 9906 | if (unlikely(!f.file)) |
2b188cc1 JA |
9907 | return -EBADF; |
9908 | ||
9909 | ret = -EOPNOTSUPP; | |
33f993da | 9910 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9911 | goto out_fput; |
9912 | ||
9913 | ret = -ENXIO; | |
9914 | ctx = f.file->private_data; | |
33f993da | 9915 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9916 | goto out_fput; |
9917 | ||
7e84e1c7 | 9918 | ret = -EBADFD; |
33f993da | 9919 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9920 | goto out; |
9921 | ||
6c271ce2 JA |
9922 | /* |
9923 | * For SQ polling, the thread will do all submissions and completions. | |
9924 | * Just return the requested submit count, and wake the thread if | |
9925 | * we were asked to. | |
9926 | */ | |
b2a9eada | 9927 | ret = 0; |
6c271ce2 | 9928 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 9929 | io_cqring_overflow_flush(ctx); |
89448c47 | 9930 | |
21f96522 JA |
9931 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9932 | ret = -EOWNERDEAD; | |
04147488 | 9933 | goto out; |
21f96522 | 9934 | } |
6c271ce2 | 9935 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9936 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9937 | if (flags & IORING_ENTER_SQ_WAIT) { |
9938 | ret = io_sqpoll_wait_sq(ctx); | |
9939 | if (ret) | |
9940 | goto out; | |
9941 | } | |
6c271ce2 | 9942 | submitted = to_submit; |
b2a9eada | 9943 | } else if (to_submit) { |
eef51daa | 9944 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9945 | if (unlikely(ret)) |
9946 | goto out; | |
2b188cc1 | 9947 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9948 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9949 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9950 | |
9951 | if (submitted != to_submit) | |
9952 | goto out; | |
2b188cc1 JA |
9953 | } |
9954 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9955 | const sigset_t __user *sig; |
9956 | struct __kernel_timespec __user *ts; | |
9957 | ||
9958 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9959 | if (unlikely(ret)) | |
9960 | goto out; | |
9961 | ||
2b188cc1 JA |
9962 | min_complete = min(min_complete, ctx->cq_entries); |
9963 | ||
32b2244a XW |
9964 | /* |
9965 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9966 | * space applications don't need to do io completion events | |
9967 | * polling again, they can rely on io_sq_thread to do polling | |
9968 | * work, which can reduce cpu usage and uring_lock contention. | |
9969 | */ | |
9970 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9971 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9972 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9973 | } else { |
c73ebb68 | 9974 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9975 | } |
2b188cc1 JA |
9976 | } |
9977 | ||
7c504e65 | 9978 | out: |
6805b32e | 9979 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9980 | out_fput: |
9981 | fdput(f); | |
9982 | return submitted ? submitted : ret; | |
9983 | } | |
9984 | ||
bebdb65e | 9985 | #ifdef CONFIG_PROC_FS |
c072481d | 9986 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 9987 | const struct cred *cred) |
87ce955b | 9988 | { |
87ce955b JA |
9989 | struct user_namespace *uns = seq_user_ns(m); |
9990 | struct group_info *gi; | |
9991 | kernel_cap_t cap; | |
9992 | unsigned __capi; | |
9993 | int g; | |
9994 | ||
9995 | seq_printf(m, "%5d\n", id); | |
9996 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9997 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9998 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9999 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10000 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10001 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10002 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10003 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10004 | seq_puts(m, "\n\tGroups:\t"); | |
10005 | gi = cred->group_info; | |
10006 | for (g = 0; g < gi->ngroups; g++) { | |
10007 | seq_put_decimal_ull(m, g ? " " : "", | |
10008 | from_kgid_munged(uns, gi->gid[g])); | |
10009 | } | |
10010 | seq_puts(m, "\n\tCapEff:\t"); | |
10011 | cap = cred->cap_effective; | |
10012 | CAP_FOR_EACH_U32(__capi) | |
10013 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10014 | seq_putc(m, '\n'); | |
10015 | return 0; | |
10016 | } | |
10017 | ||
c072481d PB |
10018 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
10019 | struct seq_file *m) | |
87ce955b | 10020 | { |
dbbe9c64 | 10021 | struct io_sq_data *sq = NULL; |
83f84356 HX |
10022 | struct io_overflow_cqe *ocqe; |
10023 | struct io_rings *r = ctx->rings; | |
10024 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
10025 | unsigned int cached_sq_head = ctx->cached_sq_head; | |
10026 | unsigned int cached_cq_tail = ctx->cached_cq_tail; | |
10027 | unsigned int sq_head = READ_ONCE(r->sq.head); | |
10028 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
10029 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
10030 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
fad8e0de | 10031 | bool has_lock; |
83f84356 HX |
10032 | unsigned int i; |
10033 | ||
10034 | /* | |
10035 | * we may get imprecise sqe and cqe info if uring is actively running | |
10036 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
10037 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
10038 | * we usually use these info when it is stuck. | |
10039 | */ | |
10040 | seq_printf(m, "SqHead:\t%u\n", sq_head & sq_mask); | |
10041 | seq_printf(m, "SqTail:\t%u\n", sq_tail & sq_mask); | |
10042 | seq_printf(m, "CachedSqHead:\t%u\n", cached_sq_head & sq_mask); | |
10043 | seq_printf(m, "CqHead:\t%u\n", cq_head & cq_mask); | |
10044 | seq_printf(m, "CqTail:\t%u\n", cq_tail & cq_mask); | |
10045 | seq_printf(m, "CachedCqTail:\t%u\n", cached_cq_tail & cq_mask); | |
10046 | seq_printf(m, "SQEs:\t%u\n", sq_tail - cached_sq_head); | |
10047 | for (i = cached_sq_head; i < sq_tail; i++) { | |
10048 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[i & sq_mask]); | |
10049 | ||
10050 | if (likely(sq_idx <= sq_mask)) { | |
10051 | struct io_uring_sqe *sqe = &ctx->sq_sqes[sq_idx]; | |
10052 | ||
10053 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
10054 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, sqe->user_data); | |
10055 | } | |
10056 | } | |
10057 | seq_printf(m, "CQEs:\t%u\n", cached_cq_tail - cq_head); | |
10058 | for (i = cq_head; i < cached_cq_tail; i++) { | |
10059 | struct io_uring_cqe *cqe = &r->cqes[i & cq_mask]; | |
10060 | ||
10061 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
10062 | i & cq_mask, cqe->user_data, cqe->res, cqe->flags); | |
10063 | } | |
87ce955b | 10064 | |
fad8e0de JA |
10065 | /* |
10066 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10067 | * since fdinfo case grabs it in the opposite direction of normal use | |
10068 | * cases. If we fail to get the lock, we just don't iterate any | |
10069 | * structures that could be going away outside the io_uring mutex. | |
10070 | */ | |
10071 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10072 | ||
5f3f26f9 | 10073 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10074 | sq = ctx->sq_data; |
5f3f26f9 JA |
10075 | if (!sq->thread) |
10076 | sq = NULL; | |
10077 | } | |
dbbe9c64 JQ |
10078 | |
10079 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10080 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10081 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10082 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10083 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10084 | |
87ce955b JA |
10085 | if (f) |
10086 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10087 | else | |
10088 | seq_printf(m, "%5u: <none>\n", i); | |
10089 | } | |
10090 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10091 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10092 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10093 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10094 | |
4751f53d | 10095 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10096 | } |
61cf9370 MWO |
10097 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10098 | unsigned long index; | |
10099 | const struct cred *cred; | |
10100 | ||
87ce955b | 10101 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10102 | xa_for_each(&ctx->personalities, index, cred) |
10103 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10104 | } |
83f84356 HX |
10105 | if (has_lock) |
10106 | mutex_unlock(&ctx->uring_lock); | |
10107 | ||
10108 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 10109 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10110 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10111 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10112 | struct io_kiocb *req; | |
10113 | ||
10114 | hlist_for_each_entry(req, list, hash_node) | |
10115 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
10116 | req->task->task_works != NULL); | |
10117 | } | |
83f84356 HX |
10118 | |
10119 | seq_puts(m, "CqOverflowList:\n"); | |
10120 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
10121 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
10122 | ||
10123 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
10124 | cqe->user_data, cqe->res, cqe->flags); | |
10125 | ||
10126 | } | |
10127 | ||
79ebeaee | 10128 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
10129 | } |
10130 | ||
c072481d | 10131 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
10132 | { |
10133 | struct io_ring_ctx *ctx = f->private_data; | |
10134 | ||
10135 | if (percpu_ref_tryget(&ctx->refs)) { | |
10136 | __io_uring_show_fdinfo(ctx, m); | |
10137 | percpu_ref_put(&ctx->refs); | |
10138 | } | |
10139 | } | |
bebdb65e | 10140 | #endif |
87ce955b | 10141 | |
2b188cc1 JA |
10142 | static const struct file_operations io_uring_fops = { |
10143 | .release = io_uring_release, | |
10144 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10145 | #ifndef CONFIG_MMU |
10146 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10147 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10148 | #endif | |
2b188cc1 | 10149 | .poll = io_uring_poll, |
bebdb65e | 10150 | #ifdef CONFIG_PROC_FS |
87ce955b | 10151 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10152 | #endif |
2b188cc1 JA |
10153 | }; |
10154 | ||
c072481d PB |
10155 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
10156 | struct io_uring_params *p) | |
2b188cc1 | 10157 | { |
75b28aff HV |
10158 | struct io_rings *rings; |
10159 | size_t size, sq_array_offset; | |
2b188cc1 | 10160 | |
bd740481 JA |
10161 | /* make sure these are sane, as we already accounted them */ |
10162 | ctx->sq_entries = p->sq_entries; | |
10163 | ctx->cq_entries = p->cq_entries; | |
10164 | ||
75b28aff HV |
10165 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10166 | if (size == SIZE_MAX) | |
10167 | return -EOVERFLOW; | |
10168 | ||
10169 | rings = io_mem_alloc(size); | |
10170 | if (!rings) | |
2b188cc1 JA |
10171 | return -ENOMEM; |
10172 | ||
75b28aff HV |
10173 | ctx->rings = rings; |
10174 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
10175 | rings->sq_ring_mask = p->sq_entries - 1; | |
10176 | rings->cq_ring_mask = p->cq_entries - 1; | |
10177 | rings->sq_ring_entries = p->sq_entries; | |
10178 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
10179 | |
10180 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
10181 | if (size == SIZE_MAX) { |
10182 | io_mem_free(ctx->rings); | |
10183 | ctx->rings = NULL; | |
2b188cc1 | 10184 | return -EOVERFLOW; |
eb065d30 | 10185 | } |
2b188cc1 JA |
10186 | |
10187 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
10188 | if (!ctx->sq_sqes) { |
10189 | io_mem_free(ctx->rings); | |
10190 | ctx->rings = NULL; | |
2b188cc1 | 10191 | return -ENOMEM; |
eb065d30 | 10192 | } |
2b188cc1 | 10193 | |
2b188cc1 JA |
10194 | return 0; |
10195 | } | |
10196 | ||
9faadcc8 PB |
10197 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
10198 | { | |
10199 | int ret, fd; | |
10200 | ||
10201 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
10202 | if (fd < 0) | |
10203 | return fd; | |
10204 | ||
eef51daa | 10205 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
10206 | if (ret) { |
10207 | put_unused_fd(fd); | |
10208 | return ret; | |
10209 | } | |
10210 | fd_install(fd, file); | |
10211 | return fd; | |
10212 | } | |
10213 | ||
2b188cc1 JA |
10214 | /* |
10215 | * Allocate an anonymous fd, this is what constitutes the application | |
10216 | * visible backing of an io_uring instance. The application mmaps this | |
10217 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
10218 | * we have to tie this fd to a socket for file garbage collection purposes. | |
10219 | */ | |
9faadcc8 | 10220 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
10221 | { |
10222 | struct file *file; | |
9faadcc8 | 10223 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
10224 | int ret; |
10225 | ||
2b188cc1 JA |
10226 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
10227 | &ctx->ring_sock); | |
10228 | if (ret) | |
9faadcc8 | 10229 | return ERR_PTR(ret); |
2b188cc1 JA |
10230 | #endif |
10231 | ||
2b188cc1 JA |
10232 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
10233 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 10234 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
10235 | if (IS_ERR(file)) { |
10236 | sock_release(ctx->ring_sock); | |
10237 | ctx->ring_sock = NULL; | |
10238 | } else { | |
10239 | ctx->ring_sock->file = file; | |
0f212204 | 10240 | } |
2b188cc1 | 10241 | #endif |
9faadcc8 | 10242 | return file; |
2b188cc1 JA |
10243 | } |
10244 | ||
c072481d PB |
10245 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
10246 | struct io_uring_params __user *params) | |
2b188cc1 | 10247 | { |
2b188cc1 | 10248 | struct io_ring_ctx *ctx; |
9faadcc8 | 10249 | struct file *file; |
2b188cc1 JA |
10250 | int ret; |
10251 | ||
8110c1a6 | 10252 | if (!entries) |
2b188cc1 | 10253 | return -EINVAL; |
8110c1a6 JA |
10254 | if (entries > IORING_MAX_ENTRIES) { |
10255 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10256 | return -EINVAL; | |
10257 | entries = IORING_MAX_ENTRIES; | |
10258 | } | |
2b188cc1 JA |
10259 | |
10260 | /* | |
10261 | * Use twice as many entries for the CQ ring. It's possible for the | |
10262 | * application to drive a higher depth than the size of the SQ ring, | |
10263 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
10264 | * some flexibility in overcommitting a bit. If the application has |
10265 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
10266 | * of CQ ring entries manually. | |
2b188cc1 JA |
10267 | */ |
10268 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
10269 | if (p->flags & IORING_SETUP_CQSIZE) { |
10270 | /* | |
10271 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
10272 | * to a power-of-two, if it isn't already. We do NOT impose | |
10273 | * any cq vs sq ring sizing. | |
10274 | */ | |
eb2667b3 | 10275 | if (!p->cq_entries) |
33a107f0 | 10276 | return -EINVAL; |
8110c1a6 JA |
10277 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
10278 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10279 | return -EINVAL; | |
10280 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
10281 | } | |
eb2667b3 JQ |
10282 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
10283 | if (p->cq_entries < p->sq_entries) | |
10284 | return -EINVAL; | |
33a107f0 JA |
10285 | } else { |
10286 | p->cq_entries = 2 * p->sq_entries; | |
10287 | } | |
2b188cc1 | 10288 | |
2b188cc1 | 10289 | ctx = io_ring_ctx_alloc(p); |
62e398be | 10290 | if (!ctx) |
2b188cc1 | 10291 | return -ENOMEM; |
2b188cc1 | 10292 | ctx->compat = in_compat_syscall(); |
62e398be JA |
10293 | if (!capable(CAP_IPC_LOCK)) |
10294 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
10295 | |
10296 | /* | |
10297 | * This is just grabbed for accounting purposes. When a process exits, | |
10298 | * the mm is exited and dropped before the files, hence we need to hang | |
10299 | * on to this mm purely for the purposes of being able to unaccount | |
10300 | * memory (locked/pinned vm). It's not used for anything else. | |
10301 | */ | |
6b7898eb | 10302 | mmgrab(current->mm); |
2aede0e4 | 10303 | ctx->mm_account = current->mm; |
6b7898eb | 10304 | |
2b188cc1 JA |
10305 | ret = io_allocate_scq_urings(ctx, p); |
10306 | if (ret) | |
10307 | goto err; | |
10308 | ||
7e84e1c7 | 10309 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
10310 | if (ret) |
10311 | goto err; | |
eae071c9 | 10312 | /* always set a rsrc node */ |
47b228ce PB |
10313 | ret = io_rsrc_node_switch_start(ctx); |
10314 | if (ret) | |
10315 | goto err; | |
eae071c9 | 10316 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 10317 | |
2b188cc1 | 10318 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
10319 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
10320 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
10321 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
10322 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
10323 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
10324 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
10325 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
10326 | |
10327 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
10328 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
10329 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
10330 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
10331 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
10332 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
10333 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 10334 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 10335 | |
7f13657d XW |
10336 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
10337 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 10338 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 10339 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
10340 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
10341 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
10342 | |
10343 | if (copy_to_user(params, p, sizeof(*p))) { | |
10344 | ret = -EFAULT; | |
10345 | goto err; | |
10346 | } | |
d1719f70 | 10347 | |
9faadcc8 PB |
10348 | file = io_uring_get_file(ctx); |
10349 | if (IS_ERR(file)) { | |
10350 | ret = PTR_ERR(file); | |
10351 | goto err; | |
10352 | } | |
10353 | ||
044c1ab3 JA |
10354 | /* |
10355 | * Install ring fd as the very last thing, so we don't risk someone | |
10356 | * having closed it before we finish setup | |
10357 | */ | |
9faadcc8 PB |
10358 | ret = io_uring_install_fd(ctx, file); |
10359 | if (ret < 0) { | |
10360 | /* fput will clean it up */ | |
10361 | fput(file); | |
10362 | return ret; | |
10363 | } | |
044c1ab3 | 10364 | |
c826bd7a | 10365 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10366 | return ret; |
10367 | err: | |
10368 | io_ring_ctx_wait_and_kill(ctx); | |
10369 | return ret; | |
10370 | } | |
10371 | ||
10372 | /* | |
10373 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10374 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10375 | * params structure passed in. | |
10376 | */ | |
10377 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10378 | { | |
10379 | struct io_uring_params p; | |
2b188cc1 JA |
10380 | int i; |
10381 | ||
10382 | if (copy_from_user(&p, params, sizeof(p))) | |
10383 | return -EFAULT; | |
10384 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10385 | if (p.resv[i]) | |
10386 | return -EINVAL; | |
10387 | } | |
10388 | ||
6c271ce2 | 10389 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10390 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10391 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10392 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10393 | return -EINVAL; |
10394 | ||
7f13657d | 10395 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10396 | } |
10397 | ||
10398 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10399 | struct io_uring_params __user *, params) | |
10400 | { | |
10401 | return io_uring_setup(entries, params); | |
10402 | } | |
10403 | ||
c072481d PB |
10404 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
10405 | unsigned nr_args) | |
66f4af93 JA |
10406 | { |
10407 | struct io_uring_probe *p; | |
10408 | size_t size; | |
10409 | int i, ret; | |
10410 | ||
10411 | size = struct_size(p, ops, nr_args); | |
10412 | if (size == SIZE_MAX) | |
10413 | return -EOVERFLOW; | |
10414 | p = kzalloc(size, GFP_KERNEL); | |
10415 | if (!p) | |
10416 | return -ENOMEM; | |
10417 | ||
10418 | ret = -EFAULT; | |
10419 | if (copy_from_user(p, arg, size)) | |
10420 | goto out; | |
10421 | ret = -EINVAL; | |
10422 | if (memchr_inv(p, 0, size)) | |
10423 | goto out; | |
10424 | ||
10425 | p->last_op = IORING_OP_LAST - 1; | |
10426 | if (nr_args > IORING_OP_LAST) | |
10427 | nr_args = IORING_OP_LAST; | |
10428 | ||
10429 | for (i = 0; i < nr_args; i++) { | |
10430 | p->ops[i].op = i; | |
10431 | if (!io_op_defs[i].not_supported) | |
10432 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10433 | } | |
10434 | p->ops_len = i; | |
10435 | ||
10436 | ret = 0; | |
10437 | if (copy_to_user(arg, p, size)) | |
10438 | ret = -EFAULT; | |
10439 | out: | |
10440 | kfree(p); | |
10441 | return ret; | |
10442 | } | |
10443 | ||
071698e1 JA |
10444 | static int io_register_personality(struct io_ring_ctx *ctx) |
10445 | { | |
4379bf8b | 10446 | const struct cred *creds; |
61cf9370 | 10447 | u32 id; |
1e6fa521 | 10448 | int ret; |
071698e1 | 10449 | |
4379bf8b | 10450 | creds = get_current_cred(); |
1e6fa521 | 10451 | |
61cf9370 MWO |
10452 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10453 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10454 | if (ret < 0) { |
10455 | put_cred(creds); | |
10456 | return ret; | |
10457 | } | |
10458 | return id; | |
071698e1 JA |
10459 | } |
10460 | ||
c072481d PB |
10461 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
10462 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
10463 | { |
10464 | struct io_uring_restriction *res; | |
10465 | size_t size; | |
10466 | int i, ret; | |
10467 | ||
7e84e1c7 SG |
10468 | /* Restrictions allowed only if rings started disabled */ |
10469 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10470 | return -EBADFD; | |
10471 | ||
21b55dbc | 10472 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10473 | if (ctx->restrictions.registered) |
21b55dbc SG |
10474 | return -EBUSY; |
10475 | ||
10476 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10477 | return -EINVAL; | |
10478 | ||
10479 | size = array_size(nr_args, sizeof(*res)); | |
10480 | if (size == SIZE_MAX) | |
10481 | return -EOVERFLOW; | |
10482 | ||
10483 | res = memdup_user(arg, size); | |
10484 | if (IS_ERR(res)) | |
10485 | return PTR_ERR(res); | |
10486 | ||
10487 | ret = 0; | |
10488 | ||
10489 | for (i = 0; i < nr_args; i++) { | |
10490 | switch (res[i].opcode) { | |
10491 | case IORING_RESTRICTION_REGISTER_OP: | |
10492 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10493 | ret = -EINVAL; | |
10494 | goto out; | |
10495 | } | |
10496 | ||
10497 | __set_bit(res[i].register_op, | |
10498 | ctx->restrictions.register_op); | |
10499 | break; | |
10500 | case IORING_RESTRICTION_SQE_OP: | |
10501 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10502 | ret = -EINVAL; | |
10503 | goto out; | |
10504 | } | |
10505 | ||
10506 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10507 | break; | |
10508 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10509 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10510 | break; | |
10511 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10512 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10513 | break; | |
10514 | default: | |
10515 | ret = -EINVAL; | |
10516 | goto out; | |
10517 | } | |
10518 | } | |
10519 | ||
10520 | out: | |
10521 | /* Reset all restrictions if an error happened */ | |
10522 | if (ret != 0) | |
10523 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10524 | else | |
7e84e1c7 | 10525 | ctx->restrictions.registered = true; |
21b55dbc SG |
10526 | |
10527 | kfree(res); | |
10528 | return ret; | |
10529 | } | |
10530 | ||
7e84e1c7 SG |
10531 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10532 | { | |
10533 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10534 | return -EBADFD; | |
10535 | ||
10536 | if (ctx->restrictions.registered) | |
10537 | ctx->restricted = 1; | |
10538 | ||
0298ef96 PB |
10539 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10540 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10541 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10542 | return 0; |
10543 | } | |
10544 | ||
fdecb662 | 10545 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10546 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10547 | unsigned nr_args) |
10548 | { | |
10549 | __u32 tmp; | |
10550 | int err; | |
10551 | ||
c3bdad02 PB |
10552 | if (up->resv) |
10553 | return -EINVAL; | |
98f0b3b4 PB |
10554 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10555 | return -EOVERFLOW; | |
10556 | err = io_rsrc_node_switch_start(ctx); | |
10557 | if (err) | |
10558 | return err; | |
10559 | ||
fdecb662 PB |
10560 | switch (type) { |
10561 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10562 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10563 | case IORING_RSRC_BUFFER: |
10564 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10565 | } |
10566 | return -EINVAL; | |
10567 | } | |
10568 | ||
c3bdad02 PB |
10569 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10570 | unsigned nr_args) | |
98f0b3b4 | 10571 | { |
c3bdad02 | 10572 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10573 | |
10574 | if (!nr_args) | |
10575 | return -EINVAL; | |
c3bdad02 PB |
10576 | memset(&up, 0, sizeof(up)); |
10577 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10578 | return -EFAULT; | |
10579 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10580 | } | |
10581 | ||
10582 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10583 | unsigned size, unsigned type) |
c3bdad02 PB |
10584 | { |
10585 | struct io_uring_rsrc_update2 up; | |
10586 | ||
10587 | if (size != sizeof(up)) | |
10588 | return -EINVAL; | |
98f0b3b4 PB |
10589 | if (copy_from_user(&up, arg, sizeof(up))) |
10590 | return -EFAULT; | |
992da01a | 10591 | if (!up.nr || up.resv) |
98f0b3b4 | 10592 | return -EINVAL; |
992da01a | 10593 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10594 | } |
10595 | ||
c072481d | 10596 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10597 | unsigned int size, unsigned int type) |
792e3582 PB |
10598 | { |
10599 | struct io_uring_rsrc_register rr; | |
10600 | ||
10601 | /* keep it extendible */ | |
10602 | if (size != sizeof(rr)) | |
10603 | return -EINVAL; | |
10604 | ||
10605 | memset(&rr, 0, sizeof(rr)); | |
10606 | if (copy_from_user(&rr, arg, size)) | |
10607 | return -EFAULT; | |
992da01a | 10608 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10609 | return -EINVAL; |
10610 | ||
992da01a | 10611 | switch (type) { |
792e3582 PB |
10612 | case IORING_RSRC_FILE: |
10613 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10614 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10615 | case IORING_RSRC_BUFFER: |
10616 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10617 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10618 | } |
10619 | return -EINVAL; | |
10620 | } | |
10621 | ||
c072481d PB |
10622 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
10623 | void __user *arg, unsigned len) | |
fe76421d JA |
10624 | { |
10625 | struct io_uring_task *tctx = current->io_uring; | |
10626 | cpumask_var_t new_mask; | |
10627 | int ret; | |
10628 | ||
10629 | if (!tctx || !tctx->io_wq) | |
10630 | return -EINVAL; | |
10631 | ||
10632 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10633 | return -ENOMEM; | |
10634 | ||
10635 | cpumask_clear(new_mask); | |
10636 | if (len > cpumask_size()) | |
10637 | len = cpumask_size(); | |
10638 | ||
10639 | if (copy_from_user(new_mask, arg, len)) { | |
10640 | free_cpumask_var(new_mask); | |
10641 | return -EFAULT; | |
10642 | } | |
10643 | ||
10644 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10645 | free_cpumask_var(new_mask); | |
10646 | return ret; | |
10647 | } | |
10648 | ||
c072481d | 10649 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
10650 | { |
10651 | struct io_uring_task *tctx = current->io_uring; | |
10652 | ||
10653 | if (!tctx || !tctx->io_wq) | |
10654 | return -EINVAL; | |
10655 | ||
10656 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10657 | } | |
10658 | ||
c072481d PB |
10659 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10660 | void __user *arg) | |
2e480058 | 10661 | { |
fa84693b JA |
10662 | struct io_uring_task *tctx = NULL; |
10663 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
10664 | __u32 new_count[2]; |
10665 | int i, ret; | |
10666 | ||
2e480058 JA |
10667 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
10668 | return -EFAULT; | |
10669 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10670 | if (new_count[i] > INT_MAX) | |
10671 | return -EINVAL; | |
10672 | ||
fa84693b JA |
10673 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
10674 | sqd = ctx->sq_data; | |
10675 | if (sqd) { | |
009ad9f0 JA |
10676 | /* |
10677 | * Observe the correct sqd->lock -> ctx->uring_lock | |
10678 | * ordering. Fine to drop uring_lock here, we hold | |
10679 | * a ref to the ctx. | |
10680 | */ | |
41d3a6bd | 10681 | refcount_inc(&sqd->refs); |
009ad9f0 | 10682 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 10683 | mutex_lock(&sqd->lock); |
009ad9f0 | 10684 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
10685 | if (sqd->thread) |
10686 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
10687 | } |
10688 | } else { | |
10689 | tctx = current->io_uring; | |
10690 | } | |
10691 | ||
10692 | ret = -EINVAL; | |
10693 | if (!tctx || !tctx->io_wq) | |
10694 | goto err; | |
10695 | ||
2e480058 JA |
10696 | ret = io_wq_max_workers(tctx->io_wq, new_count); |
10697 | if (ret) | |
fa84693b JA |
10698 | goto err; |
10699 | ||
41d3a6bd | 10700 | if (sqd) { |
fa84693b | 10701 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10702 | io_put_sq_data(sqd); |
10703 | } | |
2e480058 JA |
10704 | |
10705 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10706 | return -EFAULT; | |
10707 | ||
10708 | return 0; | |
fa84693b | 10709 | err: |
41d3a6bd | 10710 | if (sqd) { |
fa84693b | 10711 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10712 | io_put_sq_data(sqd); |
10713 | } | |
fa84693b | 10714 | return ret; |
2e480058 JA |
10715 | } |
10716 | ||
071698e1 JA |
10717 | static bool io_register_op_must_quiesce(int op) |
10718 | { | |
10719 | switch (op) { | |
bd54b6fe BM |
10720 | case IORING_REGISTER_BUFFERS: |
10721 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10722 | case IORING_REGISTER_FILES: |
071698e1 JA |
10723 | case IORING_UNREGISTER_FILES: |
10724 | case IORING_REGISTER_FILES_UPDATE: | |
10725 | case IORING_REGISTER_PROBE: | |
10726 | case IORING_REGISTER_PERSONALITY: | |
10727 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10728 | case IORING_REGISTER_FILES2: |
10729 | case IORING_REGISTER_FILES_UPDATE2: | |
10730 | case IORING_REGISTER_BUFFERS2: | |
10731 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10732 | case IORING_REGISTER_IOWQ_AFF: |
10733 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10734 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10735 | return false; |
10736 | default: | |
10737 | return true; | |
10738 | } | |
10739 | } | |
10740 | ||
c072481d | 10741 | static __cold int io_ctx_quiesce(struct io_ring_ctx *ctx) |
e73c5c7c PB |
10742 | { |
10743 | long ret; | |
10744 | ||
10745 | percpu_ref_kill(&ctx->refs); | |
10746 | ||
10747 | /* | |
10748 | * Drop uring mutex before waiting for references to exit. If another | |
10749 | * thread is currently inside io_uring_enter() it might need to grab the | |
10750 | * uring_lock to make progress. If we hold it here across the drain | |
10751 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10752 | * no new references will come in after we've killed the percpu ref. | |
10753 | */ | |
10754 | mutex_unlock(&ctx->uring_lock); | |
10755 | do { | |
37f0e767 PB |
10756 | ret = wait_for_completion_interruptible_timeout(&ctx->ref_comp, HZ); |
10757 | if (ret) { | |
10758 | ret = min(0L, ret); | |
e73c5c7c | 10759 | break; |
37f0e767 PB |
10760 | } |
10761 | ||
e73c5c7c | 10762 | ret = io_run_task_work_sig(); |
37f0e767 | 10763 | io_req_caches_free(ctx); |
e73c5c7c PB |
10764 | } while (ret >= 0); |
10765 | mutex_lock(&ctx->uring_lock); | |
10766 | ||
10767 | if (ret) | |
10768 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10769 | return ret; | |
10770 | } | |
10771 | ||
edafccee JA |
10772 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10773 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10774 | __releases(ctx->uring_lock) |
10775 | __acquires(ctx->uring_lock) | |
edafccee JA |
10776 | { |
10777 | int ret; | |
10778 | ||
35fa71a0 JA |
10779 | /* |
10780 | * We're inside the ring mutex, if the ref is already dying, then | |
10781 | * someone else killed the ctx or is already going through | |
10782 | * io_uring_register(). | |
10783 | */ | |
10784 | if (percpu_ref_is_dying(&ctx->refs)) | |
10785 | return -ENXIO; | |
10786 | ||
75c4021a PB |
10787 | if (ctx->restricted) { |
10788 | if (opcode >= IORING_REGISTER_LAST) | |
10789 | return -EINVAL; | |
10790 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10791 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10792 | return -EACCES; | |
10793 | } | |
10794 | ||
071698e1 | 10795 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10796 | ret = io_ctx_quiesce(ctx); |
10797 | if (ret) | |
f70865db | 10798 | return ret; |
05f3fb3c | 10799 | } |
edafccee JA |
10800 | |
10801 | switch (opcode) { | |
10802 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10803 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10804 | break; |
10805 | case IORING_UNREGISTER_BUFFERS: | |
10806 | ret = -EINVAL; | |
10807 | if (arg || nr_args) | |
10808 | break; | |
0a96bbe4 | 10809 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10810 | break; |
6b06314c | 10811 | case IORING_REGISTER_FILES: |
792e3582 | 10812 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10813 | break; |
10814 | case IORING_UNREGISTER_FILES: | |
10815 | ret = -EINVAL; | |
10816 | if (arg || nr_args) | |
10817 | break; | |
10818 | ret = io_sqe_files_unregister(ctx); | |
10819 | break; | |
c3a31e60 | 10820 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10821 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10822 | break; |
9b402849 | 10823 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10824 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10825 | ret = -EINVAL; |
10826 | if (nr_args != 1) | |
10827 | break; | |
10828 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10829 | if (ret) |
10830 | break; | |
10831 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10832 | ctx->eventfd_async = 1; | |
10833 | else | |
10834 | ctx->eventfd_async = 0; | |
9b402849 JA |
10835 | break; |
10836 | case IORING_UNREGISTER_EVENTFD: | |
10837 | ret = -EINVAL; | |
10838 | if (arg || nr_args) | |
10839 | break; | |
10840 | ret = io_eventfd_unregister(ctx); | |
10841 | break; | |
66f4af93 JA |
10842 | case IORING_REGISTER_PROBE: |
10843 | ret = -EINVAL; | |
10844 | if (!arg || nr_args > 256) | |
10845 | break; | |
10846 | ret = io_probe(ctx, arg, nr_args); | |
10847 | break; | |
071698e1 JA |
10848 | case IORING_REGISTER_PERSONALITY: |
10849 | ret = -EINVAL; | |
10850 | if (arg || nr_args) | |
10851 | break; | |
10852 | ret = io_register_personality(ctx); | |
10853 | break; | |
10854 | case IORING_UNREGISTER_PERSONALITY: | |
10855 | ret = -EINVAL; | |
10856 | if (arg) | |
10857 | break; | |
10858 | ret = io_unregister_personality(ctx, nr_args); | |
10859 | break; | |
7e84e1c7 SG |
10860 | case IORING_REGISTER_ENABLE_RINGS: |
10861 | ret = -EINVAL; | |
10862 | if (arg || nr_args) | |
10863 | break; | |
10864 | ret = io_register_enable_rings(ctx); | |
10865 | break; | |
21b55dbc SG |
10866 | case IORING_REGISTER_RESTRICTIONS: |
10867 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10868 | break; | |
992da01a PB |
10869 | case IORING_REGISTER_FILES2: |
10870 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10871 | break; | |
10872 | case IORING_REGISTER_FILES_UPDATE2: | |
10873 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10874 | IORING_RSRC_FILE); | |
10875 | break; | |
10876 | case IORING_REGISTER_BUFFERS2: | |
10877 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10878 | break; |
992da01a PB |
10879 | case IORING_REGISTER_BUFFERS_UPDATE: |
10880 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10881 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10882 | break; |
fe76421d JA |
10883 | case IORING_REGISTER_IOWQ_AFF: |
10884 | ret = -EINVAL; | |
10885 | if (!arg || !nr_args) | |
10886 | break; | |
10887 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10888 | break; | |
10889 | case IORING_UNREGISTER_IOWQ_AFF: | |
10890 | ret = -EINVAL; | |
10891 | if (arg || nr_args) | |
10892 | break; | |
10893 | ret = io_unregister_iowq_aff(ctx); | |
10894 | break; | |
2e480058 JA |
10895 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
10896 | ret = -EINVAL; | |
10897 | if (!arg || nr_args != 2) | |
10898 | break; | |
10899 | ret = io_register_iowq_max_workers(ctx, arg); | |
10900 | break; | |
edafccee JA |
10901 | default: |
10902 | ret = -EINVAL; | |
10903 | break; | |
10904 | } | |
10905 | ||
071698e1 | 10906 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10907 | /* bring the ctx back to life */ |
05f3fb3c | 10908 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10909 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10910 | } |
edafccee JA |
10911 | return ret; |
10912 | } | |
10913 | ||
10914 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10915 | void __user *, arg, unsigned int, nr_args) | |
10916 | { | |
10917 | struct io_ring_ctx *ctx; | |
10918 | long ret = -EBADF; | |
10919 | struct fd f; | |
10920 | ||
10921 | f = fdget(fd); | |
10922 | if (!f.file) | |
10923 | return -EBADF; | |
10924 | ||
10925 | ret = -EOPNOTSUPP; | |
10926 | if (f.file->f_op != &io_uring_fops) | |
10927 | goto out_fput; | |
10928 | ||
10929 | ctx = f.file->private_data; | |
10930 | ||
b6c23dd5 PB |
10931 | io_run_task_work(); |
10932 | ||
edafccee JA |
10933 | mutex_lock(&ctx->uring_lock); |
10934 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10935 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10936 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10937 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10938 | out_fput: |
10939 | fdput(f); | |
10940 | return ret; | |
10941 | } | |
10942 | ||
2b188cc1 JA |
10943 | static int __init io_uring_init(void) |
10944 | { | |
d7f62e82 SM |
10945 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10946 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10947 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10948 | } while (0) | |
10949 | ||
10950 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10951 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10952 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10953 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10954 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10955 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10956 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10957 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10958 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10959 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10960 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10961 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10962 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10963 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10964 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10965 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10966 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10967 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10968 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10969 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10970 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10971 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10972 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10973 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10974 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10975 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10976 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10977 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10978 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10979 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10980 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10981 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 10982 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 10983 | |
b0d658ec PB |
10984 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10985 | sizeof(struct io_uring_rsrc_update)); | |
10986 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10987 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
10988 | |
10989 | /* ->buf_index is u16 */ | |
10990 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
10991 | ||
b0d658ec PB |
10992 | /* should fit into one byte */ |
10993 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
10994 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
10995 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 10996 | |
d3656344 | 10997 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 10998 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 10999 | |
91f245d5 JA |
11000 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
11001 | SLAB_ACCOUNT); | |
2b188cc1 JA |
11002 | return 0; |
11003 | }; | |
11004 | __initcall(io_uring_init); |