Commit | Line | Data |
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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
d068b506 | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
1e84b97b SB |
15 | * store head will do). Failure to do so could lead to reading invalid |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
2b188cc1 | 60 | #include <linux/blkdev.h> |
edafccee | 61 | #include <linux/bvec.h> |
2b188cc1 JA |
62 | #include <linux/net.h> |
63 | #include <net/sock.h> | |
64 | #include <net/af_unix.h> | |
6b06314c | 65 | #include <net/scm.h> |
2b188cc1 JA |
66 | #include <linux/anon_inodes.h> |
67 | #include <linux/sched/mm.h> | |
68 | #include <linux/uaccess.h> | |
69 | #include <linux/nospec.h> | |
edafccee JA |
70 | #include <linux/sizes.h> |
71 | #include <linux/hugetlb.h> | |
aa4c3967 | 72 | #include <linux/highmem.h> |
15b71abe JA |
73 | #include <linux/namei.h> |
74 | #include <linux/fsnotify.h> | |
4840e418 | 75 | #include <linux/fadvise.h> |
3e4827b0 | 76 | #include <linux/eventpoll.h> |
7d67af2c | 77 | #include <linux/splice.h> |
b41e9852 | 78 | #include <linux/task_work.h> |
bcf5a063 | 79 | #include <linux/pagemap.h> |
0f212204 | 80 | #include <linux/io_uring.h> |
ef98eb04 | 81 | #include <linux/tracehook.h> |
5bd2182d | 82 | #include <linux/audit.h> |
cdc1404a | 83 | #include <linux/security.h> |
2b188cc1 | 84 | |
c826bd7a DD |
85 | #define CREATE_TRACE_POINTS |
86 | #include <trace/events/io_uring.h> | |
87 | ||
2b188cc1 JA |
88 | #include <uapi/linux/io_uring.h> |
89 | ||
90 | #include "internal.h" | |
561fb04a | 91 | #include "io-wq.h" |
2b188cc1 | 92 | |
5277deaa | 93 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 94 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 95 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 96 | |
187f08c1 | 97 | /* only define max */ |
042b0d85 | 98 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
99 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
100 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 101 | |
187f08c1 | 102 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
103 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
104 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
105 | ||
489809e2 PB |
106 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
107 | ||
68fe256a PB |
108 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
109 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) | |
110 | ||
111 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS|IOSQE_BUFFER_SELECT|IOSQE_IO_DRAIN) | |
112 | ||
c854357b | 113 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
d886e185 PB |
114 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \ |
115 | REQ_F_ASYNC_DATA) | |
b16fed66 | 116 | |
09899b19 PB |
117 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
118 | ||
2b188cc1 JA |
119 | struct io_uring { |
120 | u32 head ____cacheline_aligned_in_smp; | |
121 | u32 tail ____cacheline_aligned_in_smp; | |
122 | }; | |
123 | ||
1e84b97b | 124 | /* |
75b28aff HV |
125 | * This data is shared with the application through the mmap at offsets |
126 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
127 | * |
128 | * The offsets to the member fields are published through struct | |
129 | * io_sqring_offsets when calling io_uring_setup. | |
130 | */ | |
75b28aff | 131 | struct io_rings { |
1e84b97b SB |
132 | /* |
133 | * Head and tail offsets into the ring; the offsets need to be | |
134 | * masked to get valid indices. | |
135 | * | |
75b28aff HV |
136 | * The kernel controls head of the sq ring and the tail of the cq ring, |
137 | * and the application controls tail of the sq ring and the head of the | |
138 | * cq ring. | |
1e84b97b | 139 | */ |
75b28aff | 140 | struct io_uring sq, cq; |
1e84b97b | 141 | /* |
75b28aff | 142 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
143 | * ring_entries - 1) |
144 | */ | |
75b28aff HV |
145 | u32 sq_ring_mask, cq_ring_mask; |
146 | /* Ring sizes (constant, power of 2) */ | |
147 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
148 | /* |
149 | * Number of invalid entries dropped by the kernel due to | |
150 | * invalid index stored in array | |
151 | * | |
152 | * Written by the kernel, shouldn't be modified by the | |
153 | * application (i.e. get number of "new events" by comparing to | |
154 | * cached value). | |
155 | * | |
156 | * After a new SQ head value was read by the application this | |
157 | * counter includes all submissions that were dropped reaching | |
158 | * the new SQ head (and possibly more). | |
159 | */ | |
75b28aff | 160 | u32 sq_dropped; |
1e84b97b | 161 | /* |
0d9b5b3a | 162 | * Runtime SQ flags |
1e84b97b SB |
163 | * |
164 | * Written by the kernel, shouldn't be modified by the | |
165 | * application. | |
166 | * | |
167 | * The application needs a full memory barrier before checking | |
168 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
169 | */ | |
75b28aff | 170 | u32 sq_flags; |
0d9b5b3a SG |
171 | /* |
172 | * Runtime CQ flags | |
173 | * | |
174 | * Written by the application, shouldn't be modified by the | |
175 | * kernel. | |
176 | */ | |
fe7e3257 | 177 | u32 cq_flags; |
1e84b97b SB |
178 | /* |
179 | * Number of completion events lost because the queue was full; | |
180 | * this should be avoided by the application by making sure | |
0b4295b5 | 181 | * there are not more requests pending than there is space in |
1e84b97b SB |
182 | * the completion queue. |
183 | * | |
184 | * Written by the kernel, shouldn't be modified by the | |
185 | * application (i.e. get number of "new events" by comparing to | |
186 | * cached value). | |
187 | * | |
188 | * As completion events come in out of order this counter is not | |
189 | * ordered with any other data. | |
190 | */ | |
75b28aff | 191 | u32 cq_overflow; |
1e84b97b SB |
192 | /* |
193 | * Ring buffer of completion events. | |
194 | * | |
195 | * The kernel writes completion events fresh every time they are | |
196 | * produced, so the application is allowed to modify pending | |
197 | * entries. | |
198 | */ | |
75b28aff | 199 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
200 | }; |
201 | ||
45d189c6 | 202 | enum io_uring_cmd_flags { |
51aac424 | 203 | IO_URING_F_COMPLETE_DEFER = 1, |
3b44b371 | 204 | IO_URING_F_UNLOCKED = 2, |
51aac424 PB |
205 | /* int's last bit, sign checks are usually faster than a bit test */ |
206 | IO_URING_F_NONBLOCK = INT_MIN, | |
45d189c6 PB |
207 | }; |
208 | ||
edafccee JA |
209 | struct io_mapped_ubuf { |
210 | u64 ubuf; | |
4751f53d | 211 | u64 ubuf_end; |
edafccee | 212 | unsigned int nr_bvecs; |
de293938 | 213 | unsigned long acct_pages; |
41edf1a5 | 214 | struct bio_vec bvec[]; |
edafccee JA |
215 | }; |
216 | ||
50238531 BM |
217 | struct io_ring_ctx; |
218 | ||
6c2450ae PB |
219 | struct io_overflow_cqe { |
220 | struct io_uring_cqe cqe; | |
221 | struct list_head list; | |
222 | }; | |
223 | ||
a04b0ac0 PB |
224 | struct io_fixed_file { |
225 | /* file * with additional FFS_* flags */ | |
226 | unsigned long file_ptr; | |
227 | }; | |
228 | ||
269bbe5f BM |
229 | struct io_rsrc_put { |
230 | struct list_head list; | |
b60c8dce | 231 | u64 tag; |
50238531 BM |
232 | union { |
233 | void *rsrc; | |
234 | struct file *file; | |
bd54b6fe | 235 | struct io_mapped_ubuf *buf; |
50238531 | 236 | }; |
269bbe5f BM |
237 | }; |
238 | ||
aeca241b | 239 | struct io_file_table { |
042b0d85 | 240 | struct io_fixed_file *files; |
31b51510 JA |
241 | }; |
242 | ||
b895c9a6 | 243 | struct io_rsrc_node { |
05589553 XW |
244 | struct percpu_ref refs; |
245 | struct list_head node; | |
269bbe5f | 246 | struct list_head rsrc_list; |
b895c9a6 | 247 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 248 | struct llist_node llist; |
e297822b | 249 | bool done; |
05589553 XW |
250 | }; |
251 | ||
40ae0ff7 PB |
252 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
253 | ||
b895c9a6 | 254 | struct io_rsrc_data { |
05f3fb3c JA |
255 | struct io_ring_ctx *ctx; |
256 | ||
2d091d62 PB |
257 | u64 **tags; |
258 | unsigned int nr; | |
40ae0ff7 | 259 | rsrc_put_fn *do_put; |
3e942498 | 260 | atomic_t refs; |
05f3fb3c | 261 | struct completion done; |
8bad28d8 | 262 | bool quiesce; |
05f3fb3c JA |
263 | }; |
264 | ||
5a2e745d JA |
265 | struct io_buffer { |
266 | struct list_head list; | |
267 | __u64 addr; | |
d1f82808 | 268 | __u32 len; |
5a2e745d JA |
269 | __u16 bid; |
270 | }; | |
271 | ||
21b55dbc SG |
272 | struct io_restriction { |
273 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
274 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
275 | u8 sqe_flags_allowed; | |
276 | u8 sqe_flags_required; | |
7e84e1c7 | 277 | bool registered; |
21b55dbc SG |
278 | }; |
279 | ||
37d1e2e3 JA |
280 | enum { |
281 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
282 | IO_SQ_THREAD_SHOULD_PARK, | |
283 | }; | |
284 | ||
534ca6d6 JA |
285 | struct io_sq_data { |
286 | refcount_t refs; | |
9e138a48 | 287 | atomic_t park_pending; |
09a6f4ef | 288 | struct mutex lock; |
69fb2131 JA |
289 | |
290 | /* ctx's that are using this sqd */ | |
291 | struct list_head ctx_list; | |
69fb2131 | 292 | |
534ca6d6 JA |
293 | struct task_struct *thread; |
294 | struct wait_queue_head wait; | |
08369246 XW |
295 | |
296 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
297 | int sq_cpu; |
298 | pid_t task_pid; | |
5c2469e0 | 299 | pid_t task_tgid; |
37d1e2e3 JA |
300 | |
301 | unsigned long state; | |
37d1e2e3 | 302 | struct completion exited; |
534ca6d6 JA |
303 | }; |
304 | ||
6dd0be1e | 305 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 306 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 307 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 308 | |
a1ab7b35 PB |
309 | struct io_submit_link { |
310 | struct io_kiocb *head; | |
311 | struct io_kiocb *last; | |
312 | }; | |
313 | ||
258b29a9 | 314 | struct io_submit_state { |
5a158c6b PB |
315 | /* inline/task_work completion list, under ->uring_lock */ |
316 | struct io_wq_work_node free_list; | |
317 | /* batch completion logic */ | |
318 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 319 | struct io_submit_link link; |
258b29a9 | 320 | |
258b29a9 | 321 | bool plug_started; |
4b628aeb | 322 | bool need_plug; |
5ca7a8b3 | 323 | unsigned short submit_nr; |
5a158c6b | 324 | struct blk_plug plug; |
258b29a9 PB |
325 | }; |
326 | ||
2b188cc1 | 327 | struct io_ring_ctx { |
b52ecf8c | 328 | /* const or read-mostly hot data */ |
2b188cc1 JA |
329 | struct { |
330 | struct percpu_ref refs; | |
2b188cc1 | 331 | |
b52ecf8c | 332 | struct io_rings *rings; |
2b188cc1 | 333 | unsigned int flags; |
e1d85334 | 334 | unsigned int compat: 1; |
e1d85334 RD |
335 | unsigned int drain_next: 1; |
336 | unsigned int eventfd_async: 1; | |
21b55dbc | 337 | unsigned int restricted: 1; |
f18ee4cf | 338 | unsigned int off_timeout_used: 1; |
10c66904 | 339 | unsigned int drain_active: 1; |
b52ecf8c | 340 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 341 | |
7f1129d2 | 342 | /* submission data */ |
b52ecf8c | 343 | struct { |
0499e582 PB |
344 | struct mutex uring_lock; |
345 | ||
75b28aff HV |
346 | /* |
347 | * Ring buffer of indices into array of io_uring_sqe, which is | |
348 | * mmapped by the application using the IORING_OFF_SQES offset. | |
349 | * | |
350 | * This indirection could e.g. be used to assign fixed | |
351 | * io_uring_sqe entries to operations and only submit them to | |
352 | * the queue when needed. | |
353 | * | |
354 | * The kernel modifies neither the indices array nor the entries | |
355 | * array. | |
356 | */ | |
357 | u32 *sq_array; | |
c7af47cf | 358 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
359 | unsigned cached_sq_head; |
360 | unsigned sq_entries; | |
de0617e4 | 361 | struct list_head defer_list; |
7f1129d2 PB |
362 | |
363 | /* | |
364 | * Fixed resources fast path, should be accessed only under | |
365 | * uring_lock, and updated through io_uring_register(2) | |
366 | */ | |
367 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 368 | int rsrc_cached_refs; |
7f1129d2 PB |
369 | struct io_file_table file_table; |
370 | unsigned nr_user_files; | |
371 | unsigned nr_user_bufs; | |
372 | struct io_mapped_ubuf **user_bufs; | |
373 | ||
374 | struct io_submit_state submit_state; | |
5262f567 | 375 | struct list_head timeout_list; |
ef9dd637 | 376 | struct list_head ltimeout_list; |
1d7bb1d5 | 377 | struct list_head cq_overflow_list; |
7f1129d2 PB |
378 | struct xarray io_buffers; |
379 | struct xarray personalities; | |
380 | u32 pers_next; | |
381 | unsigned sq_thread_idle; | |
2b188cc1 JA |
382 | } ____cacheline_aligned_in_smp; |
383 | ||
d0acdee2 | 384 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 385 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 386 | unsigned int locked_free_nr; |
3c1a2ead | 387 | |
7c30f36a | 388 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
389 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
390 | ||
90554200 | 391 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 392 | struct list_head sqd_list; |
75b28aff | 393 | |
5ed7a37d PB |
394 | unsigned long check_cq_overflow; |
395 | ||
206aefde JA |
396 | struct { |
397 | unsigned cached_cq_tail; | |
398 | unsigned cq_entries; | |
0499e582 | 399 | struct eventfd_ctx *cq_ev_fd; |
0499e582 PB |
400 | struct wait_queue_head cq_wait; |
401 | unsigned cq_extra; | |
402 | atomic_t cq_timeouts; | |
0499e582 | 403 | unsigned cq_last_tm_flush; |
206aefde | 404 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 405 | |
2b188cc1 JA |
406 | struct { |
407 | spinlock_t completion_lock; | |
e94f141b | 408 | |
89850fce JA |
409 | spinlock_t timeout_lock; |
410 | ||
def596e9 | 411 | /* |
540e32a0 | 412 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
413 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
414 | * For SQPOLL, only the single threaded io_sq_thread() will | |
415 | * manipulate the list, hence no extra locking is needed there. | |
416 | */ | |
5eef4e87 | 417 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
418 | struct hlist_head *cancel_hash; |
419 | unsigned cancel_hash_bits; | |
915b3dde | 420 | bool poll_multi_queue; |
2b188cc1 | 421 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 422 | |
21b55dbc | 423 | struct io_restriction restrictions; |
3c1a2ead | 424 | |
b13a8918 PB |
425 | /* slow path rsrc auxilary data, used by update/register */ |
426 | struct { | |
427 | struct io_rsrc_node *rsrc_backup_node; | |
428 | struct io_mapped_ubuf *dummy_ubuf; | |
429 | struct io_rsrc_data *file_data; | |
430 | struct io_rsrc_data *buf_data; | |
431 | ||
432 | struct delayed_work rsrc_put_work; | |
433 | struct llist_head rsrc_put_llist; | |
434 | struct list_head rsrc_ref_list; | |
435 | spinlock_t rsrc_ref_lock; | |
436 | }; | |
437 | ||
3c1a2ead | 438 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
439 | struct { |
440 | #if defined(CONFIG_UNIX) | |
441 | struct socket *ring_sock; | |
442 | #endif | |
443 | /* hashed buffered write serialization */ | |
444 | struct io_wq_hash *hash_map; | |
445 | ||
446 | /* Only used for accounting purposes */ | |
447 | struct user_struct *user; | |
448 | struct mm_struct *mm_account; | |
449 | ||
450 | /* ctx exit and cancelation */ | |
9011bf9a PB |
451 | struct llist_head fallback_llist; |
452 | struct delayed_work fallback_work; | |
b986af7e PB |
453 | struct work_struct exit_work; |
454 | struct list_head tctx_list; | |
455 | struct completion ref_comp; | |
e139a1ec PB |
456 | u32 iowq_limits[2]; |
457 | bool iowq_limits_set; | |
b986af7e | 458 | }; |
2b188cc1 JA |
459 | }; |
460 | ||
53e043b2 SM |
461 | struct io_uring_task { |
462 | /* submission side */ | |
09899b19 | 463 | int cached_refs; |
53e043b2 SM |
464 | struct xarray xa; |
465 | struct wait_queue_head wait; | |
ee53fb2b SM |
466 | const struct io_ring_ctx *last; |
467 | struct io_wq *io_wq; | |
53e043b2 | 468 | struct percpu_counter inflight; |
b303fe2e | 469 | atomic_t inflight_tracked; |
53e043b2 | 470 | atomic_t in_idle; |
53e043b2 SM |
471 | |
472 | spinlock_t task_lock; | |
473 | struct io_wq_work_list task_list; | |
53e043b2 | 474 | struct callback_head task_work; |
6294f368 | 475 | bool task_running; |
53e043b2 SM |
476 | }; |
477 | ||
09bb8394 JA |
478 | /* |
479 | * First field must be the file pointer in all the | |
480 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
481 | */ | |
221c5eb2 JA |
482 | struct io_poll_iocb { |
483 | struct file *file; | |
018043be | 484 | struct wait_queue_head *head; |
221c5eb2 | 485 | __poll_t events; |
8c838788 | 486 | bool done; |
221c5eb2 | 487 | bool canceled; |
392edb45 | 488 | struct wait_queue_entry wait; |
221c5eb2 JA |
489 | }; |
490 | ||
9d805892 | 491 | struct io_poll_update { |
018043be | 492 | struct file *file; |
9d805892 PB |
493 | u64 old_user_data; |
494 | u64 new_user_data; | |
495 | __poll_t events; | |
b69de288 JA |
496 | bool update_events; |
497 | bool update_user_data; | |
018043be PB |
498 | }; |
499 | ||
b5dba59e JA |
500 | struct io_close { |
501 | struct file *file; | |
b5dba59e | 502 | int fd; |
7df778be | 503 | u32 file_slot; |
b5dba59e JA |
504 | }; |
505 | ||
ad8a48ac JA |
506 | struct io_timeout_data { |
507 | struct io_kiocb *req; | |
508 | struct hrtimer timer; | |
509 | struct timespec64 ts; | |
510 | enum hrtimer_mode mode; | |
50c1df2b | 511 | u32 flags; |
ad8a48ac JA |
512 | }; |
513 | ||
8ed8d3c3 JA |
514 | struct io_accept { |
515 | struct file *file; | |
516 | struct sockaddr __user *addr; | |
517 | int __user *addr_len; | |
518 | int flags; | |
aaa4db12 | 519 | u32 file_slot; |
09952e3e | 520 | unsigned long nofile; |
8ed8d3c3 JA |
521 | }; |
522 | ||
523 | struct io_sync { | |
524 | struct file *file; | |
525 | loff_t len; | |
526 | loff_t off; | |
527 | int flags; | |
d63d1b5e | 528 | int mode; |
8ed8d3c3 JA |
529 | }; |
530 | ||
fbf23849 JA |
531 | struct io_cancel { |
532 | struct file *file; | |
533 | u64 addr; | |
534 | }; | |
535 | ||
b29472ee JA |
536 | struct io_timeout { |
537 | struct file *file; | |
bfe68a22 PB |
538 | u32 off; |
539 | u32 target_seq; | |
135fcde8 | 540 | struct list_head list; |
90cd7e42 PB |
541 | /* head of the link, used by linked timeouts only */ |
542 | struct io_kiocb *head; | |
89b263f6 JA |
543 | /* for linked completions */ |
544 | struct io_kiocb *prev; | |
b29472ee JA |
545 | }; |
546 | ||
0bdf7a2d PB |
547 | struct io_timeout_rem { |
548 | struct file *file; | |
549 | u64 addr; | |
9c8e11b3 PB |
550 | |
551 | /* timeout update */ | |
552 | struct timespec64 ts; | |
553 | u32 flags; | |
f1042b6c | 554 | bool ltimeout; |
0bdf7a2d PB |
555 | }; |
556 | ||
9adbd45d JA |
557 | struct io_rw { |
558 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
559 | struct kiocb kiocb; | |
560 | u64 addr; | |
561 | u64 len; | |
562 | }; | |
563 | ||
3fbb51c1 JA |
564 | struct io_connect { |
565 | struct file *file; | |
566 | struct sockaddr __user *addr; | |
567 | int addr_len; | |
568 | }; | |
569 | ||
e47293fd JA |
570 | struct io_sr_msg { |
571 | struct file *file; | |
fddaface | 572 | union { |
4af3417a PB |
573 | struct compat_msghdr __user *umsg_compat; |
574 | struct user_msghdr __user *umsg; | |
575 | void __user *buf; | |
fddaface | 576 | }; |
e47293fd | 577 | int msg_flags; |
bcda7baa | 578 | int bgid; |
fddaface | 579 | size_t len; |
e47293fd JA |
580 | }; |
581 | ||
15b71abe JA |
582 | struct io_open { |
583 | struct file *file; | |
584 | int dfd; | |
b9445598 | 585 | u32 file_slot; |
15b71abe | 586 | struct filename *filename; |
c12cedf2 | 587 | struct open_how how; |
4022e7af | 588 | unsigned long nofile; |
15b71abe JA |
589 | }; |
590 | ||
269bbe5f | 591 | struct io_rsrc_update { |
05f3fb3c JA |
592 | struct file *file; |
593 | u64 arg; | |
594 | u32 nr_args; | |
595 | u32 offset; | |
596 | }; | |
597 | ||
4840e418 JA |
598 | struct io_fadvise { |
599 | struct file *file; | |
600 | u64 offset; | |
601 | u32 len; | |
602 | u32 advice; | |
603 | }; | |
604 | ||
c1ca757b JA |
605 | struct io_madvise { |
606 | struct file *file; | |
607 | u64 addr; | |
608 | u32 len; | |
609 | u32 advice; | |
610 | }; | |
611 | ||
3e4827b0 JA |
612 | struct io_epoll { |
613 | struct file *file; | |
614 | int epfd; | |
615 | int op; | |
616 | int fd; | |
617 | struct epoll_event event; | |
e47293fd JA |
618 | }; |
619 | ||
7d67af2c PB |
620 | struct io_splice { |
621 | struct file *file_out; | |
622 | struct file *file_in; | |
623 | loff_t off_out; | |
624 | loff_t off_in; | |
625 | u64 len; | |
626 | unsigned int flags; | |
627 | }; | |
628 | ||
ddf0322d JA |
629 | struct io_provide_buf { |
630 | struct file *file; | |
631 | __u64 addr; | |
38134ada | 632 | __u32 len; |
ddf0322d JA |
633 | __u32 bgid; |
634 | __u16 nbufs; | |
635 | __u16 bid; | |
636 | }; | |
637 | ||
1d9e1288 BM |
638 | struct io_statx { |
639 | struct file *file; | |
640 | int dfd; | |
641 | unsigned int mask; | |
642 | unsigned int flags; | |
e62753e4 | 643 | const char __user *filename; |
1d9e1288 BM |
644 | struct statx __user *buffer; |
645 | }; | |
646 | ||
36f4fa68 JA |
647 | struct io_shutdown { |
648 | struct file *file; | |
649 | int how; | |
650 | }; | |
651 | ||
80a261fd JA |
652 | struct io_rename { |
653 | struct file *file; | |
654 | int old_dfd; | |
655 | int new_dfd; | |
656 | struct filename *oldpath; | |
657 | struct filename *newpath; | |
658 | int flags; | |
659 | }; | |
660 | ||
14a1143b JA |
661 | struct io_unlink { |
662 | struct file *file; | |
663 | int dfd; | |
664 | int flags; | |
665 | struct filename *filename; | |
666 | }; | |
667 | ||
e34a02dc DK |
668 | struct io_mkdir { |
669 | struct file *file; | |
670 | int dfd; | |
671 | umode_t mode; | |
672 | struct filename *filename; | |
673 | }; | |
674 | ||
7a8721f8 DK |
675 | struct io_symlink { |
676 | struct file *file; | |
677 | int new_dfd; | |
678 | struct filename *oldpath; | |
679 | struct filename *newpath; | |
680 | }; | |
681 | ||
cf30da90 DK |
682 | struct io_hardlink { |
683 | struct file *file; | |
684 | int old_dfd; | |
685 | int new_dfd; | |
686 | struct filename *oldpath; | |
687 | struct filename *newpath; | |
688 | int flags; | |
689 | }; | |
690 | ||
f499a021 JA |
691 | struct io_async_connect { |
692 | struct sockaddr_storage address; | |
693 | }; | |
694 | ||
03b1230c JA |
695 | struct io_async_msghdr { |
696 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
697 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
698 | struct iovec *free_iov; | |
03b1230c JA |
699 | struct sockaddr __user *uaddr; |
700 | struct msghdr msg; | |
b537916c | 701 | struct sockaddr_storage addr; |
03b1230c JA |
702 | }; |
703 | ||
538941e2 | 704 | struct io_rw_state { |
ff6165b2 | 705 | struct iov_iter iter; |
cd658695 | 706 | struct iov_iter_state iter_state; |
c88598a9 | 707 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
708 | }; |
709 | ||
710 | struct io_async_rw { | |
711 | struct io_rw_state s; | |
712 | const struct iovec *free_iovec; | |
227c0c96 | 713 | size_t bytes_done; |
bcf5a063 | 714 | struct wait_page_queue wpq; |
f67676d1 JA |
715 | }; |
716 | ||
6b47ee6e PB |
717 | enum { |
718 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
719 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
720 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
721 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
722 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 723 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 724 | |
dddca226 | 725 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 726 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
727 | REQ_F_INFLIGHT_BIT, |
728 | REQ_F_CUR_POS_BIT, | |
729 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 730 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 731 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 732 | REQ_F_POLLED_BIT, |
bcda7baa | 733 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 734 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 735 | REQ_F_REISSUE_BIT, |
b8e64b53 | 736 | REQ_F_CREDS_BIT, |
20e60a38 | 737 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 738 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 739 | REQ_F_ASYNC_DATA_BIT, |
7b29f92d | 740 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 741 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 742 | REQ_F_ISREG_BIT, |
84557871 JA |
743 | |
744 | /* not a real bit, just to check we're not overflowing the space */ | |
745 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
746 | }; |
747 | ||
748 | enum { | |
749 | /* ctx owns file */ | |
750 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
751 | /* drain existing IO first */ | |
752 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
753 | /* linked sqes */ | |
754 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
755 | /* doesn't sever on completion < 0 */ | |
756 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
757 | /* IOSQE_ASYNC */ | |
758 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
759 | /* IOSQE_BUFFER_SELECT */ |
760 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 761 | |
6b47ee6e | 762 | /* fail rest of links */ |
93d2bcd2 | 763 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 764 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
765 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
766 | /* read/write uses file position */ | |
767 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
768 | /* must not punt to workers */ | |
769 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 770 | /* has or had linked timeout */ |
6b47ee6e | 771 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
772 | /* needs cleanup */ |
773 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
774 | /* already went through poll handler */ |
775 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
776 | /* buffer already selected */ |
777 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
778 | /* completion is deferred through io_comp_state */ |
779 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
780 | /* caller should reissue async */ |
781 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
782 | /* supports async reads/writes */ |
783 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
784 | /* regular file */ |
785 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
786 | /* has creds assigned */ |
787 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
788 | /* skip refcounting if not set */ |
789 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
790 | /* there is a linked timeout that has to be armed */ |
791 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
792 | /* ->async_data allocated */ |
793 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
d7718a9d JA |
794 | }; |
795 | ||
796 | struct async_poll { | |
797 | struct io_poll_iocb poll; | |
807abcb0 | 798 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
799 | }; |
800 | ||
f237c30a | 801 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 802 | |
7cbf1722 | 803 | struct io_task_work { |
5b0a6acc PB |
804 | union { |
805 | struct io_wq_work_node node; | |
806 | struct llist_node fallback_node; | |
807 | }; | |
808 | io_req_tw_func_t func; | |
7cbf1722 JA |
809 | }; |
810 | ||
992da01a PB |
811 | enum { |
812 | IORING_RSRC_FILE = 0, | |
813 | IORING_RSRC_BUFFER = 1, | |
814 | }; | |
815 | ||
09bb8394 JA |
816 | /* |
817 | * NOTE! Each of the iocb union members has the file pointer | |
818 | * as the first entry in their struct definition. So you can | |
819 | * access the file pointer through any of the sub-structs, | |
820 | * or directly as just 'ki_filp' in this struct. | |
821 | */ | |
2b188cc1 | 822 | struct io_kiocb { |
221c5eb2 | 823 | union { |
09bb8394 | 824 | struct file *file; |
9adbd45d | 825 | struct io_rw rw; |
221c5eb2 | 826 | struct io_poll_iocb poll; |
9d805892 | 827 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
828 | struct io_accept accept; |
829 | struct io_sync sync; | |
fbf23849 | 830 | struct io_cancel cancel; |
b29472ee | 831 | struct io_timeout timeout; |
0bdf7a2d | 832 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 833 | struct io_connect connect; |
e47293fd | 834 | struct io_sr_msg sr_msg; |
15b71abe | 835 | struct io_open open; |
b5dba59e | 836 | struct io_close close; |
269bbe5f | 837 | struct io_rsrc_update rsrc_update; |
4840e418 | 838 | struct io_fadvise fadvise; |
c1ca757b | 839 | struct io_madvise madvise; |
3e4827b0 | 840 | struct io_epoll epoll; |
7d67af2c | 841 | struct io_splice splice; |
ddf0322d | 842 | struct io_provide_buf pbuf; |
1d9e1288 | 843 | struct io_statx statx; |
36f4fa68 | 844 | struct io_shutdown shutdown; |
80a261fd | 845 | struct io_rename rename; |
14a1143b | 846 | struct io_unlink unlink; |
e34a02dc | 847 | struct io_mkdir mkdir; |
7a8721f8 | 848 | struct io_symlink symlink; |
cf30da90 | 849 | struct io_hardlink hardlink; |
221c5eb2 | 850 | }; |
2b188cc1 | 851 | |
d625c6ee | 852 | u8 opcode; |
65a6543d XW |
853 | /* polled IO has completed */ |
854 | u8 iopoll_completed; | |
4f4eeba8 | 855 | u16 buf_index; |
d17e56eb PB |
856 | unsigned int flags; |
857 | ||
858 | u64 user_data; | |
9cf7c104 | 859 | u32 result; |
d17e56eb | 860 | u32 cflags; |
4f4eeba8 | 861 | |
010e8e6b | 862 | struct io_ring_ctx *ctx; |
010e8e6b | 863 | struct task_struct *task; |
d7718a9d | 864 | |
269bbe5f | 865 | struct percpu_ref *fixed_rsrc_refs; |
d886e185 PB |
866 | /* store used ubuf, so we can prevent reloading */ |
867 | struct io_mapped_ubuf *imu; | |
fcb323cc | 868 | |
7e3709d5 | 869 | /* used by request caches, completion batching and iopoll */ |
ef05d9eb | 870 | struct io_wq_work_node comp_list; |
d17e56eb | 871 | atomic_t refs; |
7e3709d5 | 872 | struct io_kiocb *link; |
5b0a6acc | 873 | struct io_task_work io_task_work; |
010e8e6b PB |
874 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
875 | struct hlist_node hash_node; | |
7e3709d5 | 876 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 877 | struct async_poll *apoll; |
d886e185 PB |
878 | /* opcode allocated if it needs to store data for async defer */ |
879 | void *async_data; | |
010e8e6b | 880 | struct io_wq_work work; |
7e3709d5 | 881 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
fe7e3257 | 882 | const struct cred *creds; |
7e3709d5 | 883 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ |
30d51dd4 | 884 | struct io_buffer *kbuf; |
2b188cc1 | 885 | }; |
05589553 | 886 | |
13bf43f5 PB |
887 | struct io_tctx_node { |
888 | struct list_head ctx_node; | |
889 | struct task_struct *task; | |
13bf43f5 PB |
890 | struct io_ring_ctx *ctx; |
891 | }; | |
892 | ||
27dc8338 PB |
893 | struct io_defer_entry { |
894 | struct list_head list; | |
895 | struct io_kiocb *req; | |
9cf7c104 | 896 | u32 seq; |
2b188cc1 JA |
897 | }; |
898 | ||
d3656344 | 899 | struct io_op_def { |
d3656344 JA |
900 | /* needs req->file assigned */ |
901 | unsigned needs_file : 1; | |
6d63416d PB |
902 | /* should block plug */ |
903 | unsigned plug : 1; | |
d3656344 JA |
904 | /* hash wq insertion if file is a regular file */ |
905 | unsigned hash_reg_file : 1; | |
906 | /* unbound wq insertion if file is a non-regular file */ | |
907 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
908 | /* set if opcode supports polled "wait" */ |
909 | unsigned pollin : 1; | |
910 | unsigned pollout : 1; | |
bcda7baa JA |
911 | /* op supports buffer selection */ |
912 | unsigned buffer_select : 1; | |
26f0505a PB |
913 | /* do prep async if is going to be punted */ |
914 | unsigned needs_async_setup : 1; | |
6d63416d PB |
915 | /* opcode is not supported by this kernel */ |
916 | unsigned not_supported : 1; | |
5bd2182d PM |
917 | /* skip auditing */ |
918 | unsigned audit_skip : 1; | |
e8c2bc1f JA |
919 | /* size of async data needed, if any */ |
920 | unsigned short async_size; | |
d3656344 JA |
921 | }; |
922 | ||
0918682b | 923 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
924 | [IORING_OP_NOP] = {}, |
925 | [IORING_OP_READV] = { | |
d3656344 JA |
926 | .needs_file = 1, |
927 | .unbound_nonreg_file = 1, | |
8a72758c | 928 | .pollin = 1, |
4d954c25 | 929 | .buffer_select = 1, |
26f0505a | 930 | .needs_async_setup = 1, |
27926b68 | 931 | .plug = 1, |
5bd2182d | 932 | .audit_skip = 1, |
e8c2bc1f | 933 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 934 | }, |
0463b6c5 | 935 | [IORING_OP_WRITEV] = { |
d3656344 JA |
936 | .needs_file = 1, |
937 | .hash_reg_file = 1, | |
938 | .unbound_nonreg_file = 1, | |
8a72758c | 939 | .pollout = 1, |
26f0505a | 940 | .needs_async_setup = 1, |
27926b68 | 941 | .plug = 1, |
5bd2182d | 942 | .audit_skip = 1, |
e8c2bc1f | 943 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 944 | }, |
0463b6c5 | 945 | [IORING_OP_FSYNC] = { |
d3656344 | 946 | .needs_file = 1, |
5bd2182d | 947 | .audit_skip = 1, |
d3656344 | 948 | }, |
0463b6c5 | 949 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
950 | .needs_file = 1, |
951 | .unbound_nonreg_file = 1, | |
8a72758c | 952 | .pollin = 1, |
27926b68 | 953 | .plug = 1, |
5bd2182d | 954 | .audit_skip = 1, |
e8c2bc1f | 955 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 956 | }, |
0463b6c5 | 957 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
958 | .needs_file = 1, |
959 | .hash_reg_file = 1, | |
960 | .unbound_nonreg_file = 1, | |
8a72758c | 961 | .pollout = 1, |
27926b68 | 962 | .plug = 1, |
5bd2182d | 963 | .audit_skip = 1, |
e8c2bc1f | 964 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 965 | }, |
0463b6c5 | 966 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
967 | .needs_file = 1, |
968 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
969 | .audit_skip = 1, |
970 | }, | |
971 | [IORING_OP_POLL_REMOVE] = { | |
972 | .audit_skip = 1, | |
d3656344 | 973 | }, |
0463b6c5 | 974 | [IORING_OP_SYNC_FILE_RANGE] = { |
d3656344 | 975 | .needs_file = 1, |
5bd2182d | 976 | .audit_skip = 1, |
d3656344 | 977 | }, |
0463b6c5 | 978 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
979 | .needs_file = 1, |
980 | .unbound_nonreg_file = 1, | |
8a72758c | 981 | .pollout = 1, |
26f0505a | 982 | .needs_async_setup = 1, |
e8c2bc1f | 983 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 984 | }, |
0463b6c5 | 985 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
986 | .needs_file = 1, |
987 | .unbound_nonreg_file = 1, | |
8a72758c | 988 | .pollin = 1, |
52de1fe1 | 989 | .buffer_select = 1, |
26f0505a | 990 | .needs_async_setup = 1, |
e8c2bc1f | 991 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 992 | }, |
0463b6c5 | 993 | [IORING_OP_TIMEOUT] = { |
5bd2182d | 994 | .audit_skip = 1, |
e8c2bc1f | 995 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 996 | }, |
9c8e11b3 PB |
997 | [IORING_OP_TIMEOUT_REMOVE] = { |
998 | /* used by timeout updates' prep() */ | |
5bd2182d | 999 | .audit_skip = 1, |
9c8e11b3 | 1000 | }, |
0463b6c5 | 1001 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
1002 | .needs_file = 1, |
1003 | .unbound_nonreg_file = 1, | |
8a72758c | 1004 | .pollin = 1, |
d3656344 | 1005 | }, |
5bd2182d PM |
1006 | [IORING_OP_ASYNC_CANCEL] = { |
1007 | .audit_skip = 1, | |
1008 | }, | |
0463b6c5 | 1009 | [IORING_OP_LINK_TIMEOUT] = { |
5bd2182d | 1010 | .audit_skip = 1, |
e8c2bc1f | 1011 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1012 | }, |
0463b6c5 | 1013 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1014 | .needs_file = 1, |
1015 | .unbound_nonreg_file = 1, | |
8a72758c | 1016 | .pollout = 1, |
26f0505a | 1017 | .needs_async_setup = 1, |
e8c2bc1f | 1018 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1019 | }, |
0463b6c5 | 1020 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1021 | .needs_file = 1, |
d3656344 | 1022 | }, |
44526bed JA |
1023 | [IORING_OP_OPENAT] = {}, |
1024 | [IORING_OP_CLOSE] = {}, | |
5bd2182d PM |
1025 | [IORING_OP_FILES_UPDATE] = { |
1026 | .audit_skip = 1, | |
1027 | }, | |
1028 | [IORING_OP_STATX] = { | |
1029 | .audit_skip = 1, | |
1030 | }, | |
0463b6c5 | 1031 | [IORING_OP_READ] = { |
3a6820f2 JA |
1032 | .needs_file = 1, |
1033 | .unbound_nonreg_file = 1, | |
8a72758c | 1034 | .pollin = 1, |
bcda7baa | 1035 | .buffer_select = 1, |
27926b68 | 1036 | .plug = 1, |
5bd2182d | 1037 | .audit_skip = 1, |
e8c2bc1f | 1038 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1039 | }, |
0463b6c5 | 1040 | [IORING_OP_WRITE] = { |
3a6820f2 | 1041 | .needs_file = 1, |
7b3188e7 | 1042 | .hash_reg_file = 1, |
3a6820f2 | 1043 | .unbound_nonreg_file = 1, |
8a72758c | 1044 | .pollout = 1, |
27926b68 | 1045 | .plug = 1, |
5bd2182d | 1046 | .audit_skip = 1, |
e8c2bc1f | 1047 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1048 | }, |
0463b6c5 | 1049 | [IORING_OP_FADVISE] = { |
4840e418 | 1050 | .needs_file = 1, |
5bd2182d | 1051 | .audit_skip = 1, |
c1ca757b | 1052 | }, |
44526bed | 1053 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1054 | [IORING_OP_SEND] = { |
fddaface JA |
1055 | .needs_file = 1, |
1056 | .unbound_nonreg_file = 1, | |
8a72758c | 1057 | .pollout = 1, |
5bd2182d | 1058 | .audit_skip = 1, |
fddaface | 1059 | }, |
0463b6c5 | 1060 | [IORING_OP_RECV] = { |
fddaface JA |
1061 | .needs_file = 1, |
1062 | .unbound_nonreg_file = 1, | |
8a72758c | 1063 | .pollin = 1, |
bcda7baa | 1064 | .buffer_select = 1, |
5bd2182d | 1065 | .audit_skip = 1, |
fddaface | 1066 | }, |
0463b6c5 | 1067 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1068 | }, |
3e4827b0 JA |
1069 | [IORING_OP_EPOLL_CTL] = { |
1070 | .unbound_nonreg_file = 1, | |
5bd2182d | 1071 | .audit_skip = 1, |
3e4827b0 | 1072 | }, |
7d67af2c PB |
1073 | [IORING_OP_SPLICE] = { |
1074 | .needs_file = 1, | |
1075 | .hash_reg_file = 1, | |
1076 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1077 | .audit_skip = 1, |
1078 | }, | |
1079 | [IORING_OP_PROVIDE_BUFFERS] = { | |
1080 | .audit_skip = 1, | |
1081 | }, | |
1082 | [IORING_OP_REMOVE_BUFFERS] = { | |
1083 | .audit_skip = 1, | |
ddf0322d | 1084 | }, |
f2a8d5c7 PB |
1085 | [IORING_OP_TEE] = { |
1086 | .needs_file = 1, | |
1087 | .hash_reg_file = 1, | |
1088 | .unbound_nonreg_file = 1, | |
5bd2182d | 1089 | .audit_skip = 1, |
f2a8d5c7 | 1090 | }, |
36f4fa68 JA |
1091 | [IORING_OP_SHUTDOWN] = { |
1092 | .needs_file = 1, | |
1093 | }, | |
44526bed JA |
1094 | [IORING_OP_RENAMEAT] = {}, |
1095 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1096 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1097 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1098 | [IORING_OP_LINKAT] = {}, |
d3656344 JA |
1099 | }; |
1100 | ||
0756a869 PB |
1101 | /* requests with any of those set should undergo io_disarm_next() */ |
1102 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1103 | ||
7a612350 | 1104 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1105 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1106 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1107 | struct task_struct *task, | |
3dd0c97a | 1108 | bool cancel_all); |
78cc687b | 1109 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1110 | |
d4d19c19 | 1111 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1112 | s32 res, u32 cflags); |
ec9c02ad | 1113 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1114 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1115 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1116 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1117 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1118 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1119 | unsigned nr_args); |
68fb8979 | 1120 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1121 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1122 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1123 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1124 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1125 | |
907d1df3 | 1126 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1127 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1128 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1129 | |
b9445598 PB |
1130 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1131 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1132 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1133 | ||
f1042b6c | 1134 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1135 | |
2b188cc1 JA |
1136 | static struct kmem_cache *req_cachep; |
1137 | ||
0918682b | 1138 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1139 | |
1140 | struct sock *io_uring_get_socket(struct file *file) | |
1141 | { | |
1142 | #if defined(CONFIG_UNIX) | |
1143 | if (file->f_op == &io_uring_fops) { | |
1144 | struct io_ring_ctx *ctx = file->private_data; | |
1145 | ||
1146 | return ctx->ring_sock->sk; | |
1147 | } | |
1148 | #endif | |
1149 | return NULL; | |
1150 | } | |
1151 | EXPORT_SYMBOL(io_uring_get_socket); | |
1152 | ||
f237c30a PB |
1153 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1154 | { | |
1155 | if (!*locked) { | |
1156 | mutex_lock(&ctx->uring_lock); | |
1157 | *locked = true; | |
1158 | } | |
1159 | } | |
1160 | ||
f2f87370 PB |
1161 | #define io_for_each_link(pos, head) \ |
1162 | for (pos = (head); pos; pos = pos->link) | |
1163 | ||
21c843d5 PB |
1164 | /* |
1165 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1166 | * see commit f958d7b528b1 for details. | |
1167 | */ | |
1168 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1169 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1170 | ||
1171 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1172 | { | |
20e60a38 | 1173 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1174 | return atomic_inc_not_zero(&req->refs); |
1175 | } | |
1176 | ||
21c843d5 PB |
1177 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1178 | { | |
20e60a38 PB |
1179 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1180 | return true; | |
1181 | ||
21c843d5 PB |
1182 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1183 | return atomic_dec_and_test(&req->refs); | |
1184 | } | |
1185 | ||
1186 | static inline void req_ref_put(struct io_kiocb *req) | |
1187 | { | |
20e60a38 | 1188 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1189 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1190 | } | |
1191 | ||
1192 | static inline void req_ref_get(struct io_kiocb *req) | |
1193 | { | |
20e60a38 | 1194 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1195 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1196 | atomic_inc(&req->refs); | |
1197 | } | |
1198 | ||
c450178d PB |
1199 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1200 | { | |
6f33b0bc | 1201 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1202 | __io_submit_flush_completions(ctx); |
1203 | } | |
1204 | ||
48dcd38d | 1205 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1206 | { |
1207 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1208 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1209 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1210 | } |
1211 | } | |
1212 | ||
48dcd38d PB |
1213 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1214 | { | |
1215 | __io_req_set_refcount(req, 1); | |
1216 | } | |
1217 | ||
ab409402 PB |
1218 | #define IO_RSRC_REF_BATCH 100 |
1219 | ||
1220 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, | |
1221 | struct io_ring_ctx *ctx) | |
1222 | __must_hold(&ctx->uring_lock) | |
36f72fe2 | 1223 | { |
ab409402 PB |
1224 | struct percpu_ref *ref = req->fixed_rsrc_refs; |
1225 | ||
1226 | if (ref) { | |
1227 | if (ref == &ctx->rsrc_node->refs) | |
1228 | ctx->rsrc_cached_refs++; | |
1229 | else | |
1230 | percpu_ref_put(ref); | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | static inline void io_req_put_rsrc(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1235 | { | |
1236 | if (req->fixed_rsrc_refs) | |
1237 | percpu_ref_put(req->fixed_rsrc_refs); | |
1238 | } | |
1239 | ||
1240 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1241 | __must_hold(&ctx->uring_lock) | |
1242 | { | |
1243 | if (ctx->rsrc_cached_refs) { | |
1244 | percpu_ref_put_many(&ctx->rsrc_node->refs, ctx->rsrc_cached_refs); | |
1245 | ctx->rsrc_cached_refs = 0; | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1250 | __must_hold(&ctx->uring_lock) | |
1251 | { | |
1252 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1253 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1254 | } | |
36f72fe2 | 1255 | |
a46be971 PB |
1256 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
1257 | struct io_ring_ctx *ctx) | |
36f72fe2 | 1258 | { |
269bbe5f | 1259 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1260 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
ab409402 PB |
1261 | ctx->rsrc_cached_refs--; |
1262 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1263 | io_rsrc_refs_refill(ctx); | |
36f72fe2 PB |
1264 | } |
1265 | } | |
1266 | ||
f70865db PB |
1267 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1268 | { | |
1269 | bool got = percpu_ref_tryget(ref); | |
1270 | ||
1271 | /* already at zero, wait for ->release() */ | |
1272 | if (!got) | |
1273 | wait_for_completion(compl); | |
1274 | percpu_ref_resurrect(ref); | |
1275 | if (got) | |
1276 | percpu_ref_put(ref); | |
1277 | } | |
1278 | ||
3dd0c97a PB |
1279 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1280 | bool cancel_all) | |
6af3f48b | 1281 | __must_hold(&req->ctx->timeout_lock) |
08d23634 PB |
1282 | { |
1283 | struct io_kiocb *req; | |
1284 | ||
68207680 | 1285 | if (task && head->task != task) |
08d23634 | 1286 | return false; |
3dd0c97a | 1287 | if (cancel_all) |
08d23634 PB |
1288 | return true; |
1289 | ||
1290 | io_for_each_link(req, head) { | |
b05a1bcd | 1291 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1292 | return true; |
08d23634 PB |
1293 | } |
1294 | return false; | |
1295 | } | |
1296 | ||
6af3f48b PB |
1297 | static bool io_match_linked(struct io_kiocb *head) |
1298 | { | |
1299 | struct io_kiocb *req; | |
1300 | ||
1301 | io_for_each_link(req, head) { | |
1302 | if (req->flags & REQ_F_INFLIGHT) | |
1303 | return true; | |
1304 | } | |
1305 | return false; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * As io_match_task() but protected against racing with linked timeouts. | |
1310 | * User must not hold timeout_lock. | |
1311 | */ | |
1312 | static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, | |
1313 | bool cancel_all) | |
1314 | { | |
1315 | bool matched; | |
1316 | ||
1317 | if (task && head->task != task) | |
1318 | return false; | |
1319 | if (cancel_all) | |
1320 | return true; | |
1321 | ||
1322 | if (head->flags & REQ_F_LINK_TIMEOUT) { | |
1323 | struct io_ring_ctx *ctx = head->ctx; | |
1324 | ||
1325 | /* protect against races with linked timeouts */ | |
1326 | spin_lock_irq(&ctx->timeout_lock); | |
1327 | matched = io_match_linked(head); | |
1328 | spin_unlock_irq(&ctx->timeout_lock); | |
1329 | } else { | |
1330 | matched = io_match_linked(head); | |
1331 | } | |
1332 | return matched; | |
1333 | } | |
1334 | ||
d886e185 PB |
1335 | static inline bool req_has_async_data(struct io_kiocb *req) |
1336 | { | |
1337 | return req->flags & REQ_F_ASYNC_DATA; | |
1338 | } | |
1339 | ||
93d2bcd2 | 1340 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1341 | { |
93d2bcd2 | 1342 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1343 | } |
4a38aed2 | 1344 | |
a8295b98 HX |
1345 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1346 | { | |
1347 | req_set_fail(req); | |
1348 | req->result = res; | |
1349 | } | |
1350 | ||
c072481d | 1351 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1352 | { |
1353 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1354 | ||
0f158b4c | 1355 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1356 | } |
1357 | ||
8eb7e2d0 PB |
1358 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1359 | { | |
1360 | return !req->timeout.off; | |
1361 | } | |
1362 | ||
c072481d | 1363 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1364 | { |
1365 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1366 | fallback_work.work); | |
1367 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1368 | struct io_kiocb *req, *tmp; | |
f237c30a | 1369 | bool locked = false; |
f56165e6 PB |
1370 | |
1371 | percpu_ref_get(&ctx->refs); | |
1372 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1373 | req->io_task_work.func(req, &locked); |
5636c00d | 1374 | |
f237c30a | 1375 | if (locked) { |
c450178d | 1376 | io_submit_flush_completions(ctx); |
f237c30a PB |
1377 | mutex_unlock(&ctx->uring_lock); |
1378 | } | |
f56165e6 PB |
1379 | percpu_ref_put(&ctx->refs); |
1380 | } | |
1381 | ||
c072481d | 1382 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1383 | { |
1384 | struct io_ring_ctx *ctx; | |
78076bb6 | 1385 | int hash_bits; |
2b188cc1 JA |
1386 | |
1387 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1388 | if (!ctx) | |
1389 | return NULL; | |
1390 | ||
78076bb6 JA |
1391 | /* |
1392 | * Use 5 bits less than the max cq entries, that should give us around | |
1393 | * 32 entries per hash list if totally full and uniformly spread. | |
1394 | */ | |
1395 | hash_bits = ilog2(p->cq_entries); | |
1396 | hash_bits -= 5; | |
1397 | if (hash_bits <= 0) | |
1398 | hash_bits = 1; | |
1399 | ctx->cancel_hash_bits = hash_bits; | |
1400 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1401 | GFP_KERNEL); | |
1402 | if (!ctx->cancel_hash) | |
1403 | goto err; | |
1404 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1405 | ||
6224843d PB |
1406 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1407 | if (!ctx->dummy_ubuf) | |
1408 | goto err; | |
1409 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1410 | ctx->dummy_ubuf->ubuf = -1UL; | |
1411 | ||
21482896 | 1412 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1413 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1414 | goto err; | |
2b188cc1 JA |
1415 | |
1416 | ctx->flags = p->flags; | |
90554200 | 1417 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1418 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1419 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1420 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1421 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1422 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1423 | mutex_init(&ctx->uring_lock); |
311997b3 | 1424 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1425 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1426 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1427 | INIT_WQ_LIST(&ctx->iopoll_list); |
de0617e4 | 1428 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1429 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1430 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1431 | spin_lock_init(&ctx->rsrc_ref_lock); |
1432 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1433 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1434 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1435 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1436 | ctx->submit_state.free_list.next = NULL; |
1437 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1438 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1439 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1440 | return ctx; |
206aefde | 1441 | err: |
6224843d | 1442 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1443 | kfree(ctx->cancel_hash); |
206aefde JA |
1444 | kfree(ctx); |
1445 | return NULL; | |
2b188cc1 JA |
1446 | } |
1447 | ||
8f6ed49a PB |
1448 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1449 | { | |
1450 | struct io_rings *r = ctx->rings; | |
1451 | ||
1452 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1453 | ctx->cq_extra--; | |
1454 | } | |
1455 | ||
9cf7c104 | 1456 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1457 | { |
2bc9930e JA |
1458 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1459 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1460 | |
8f6ed49a | 1461 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1462 | } |
de0617e4 | 1463 | |
9d858b21 | 1464 | return false; |
de0617e4 JA |
1465 | } |
1466 | ||
35645ac3 PB |
1467 | #define FFS_NOWAIT 0x1UL |
1468 | #define FFS_ISREG 0x2UL | |
1469 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG) | |
c97d8a0f PB |
1470 | |
1471 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1472 | { | |
35645ac3 | 1473 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1474 | } |
1475 | ||
c072481d | 1476 | static inline void io_req_track_inflight(struct io_kiocb *req) |
ce3d5aae | 1477 | { |
ce3d5aae | 1478 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1479 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1480 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1481 | } |
1482 | } | |
1483 | ||
fd08e530 PB |
1484 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1485 | { | |
906c6caa PB |
1486 | if (WARN_ON_ONCE(!req->link)) |
1487 | return NULL; | |
1488 | ||
4d13d1a4 PB |
1489 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1490 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1491 | |
1492 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1493 | io_req_set_refcount(req); |
4d13d1a4 PB |
1494 | __io_req_set_refcount(req->link, 2); |
1495 | return req->link; | |
fd08e530 PB |
1496 | } |
1497 | ||
1498 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1499 | { | |
4d13d1a4 | 1500 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1501 | return NULL; |
1502 | return __io_prep_linked_timeout(req); | |
1503 | } | |
1504 | ||
1e6fa521 JA |
1505 | static void io_prep_async_work(struct io_kiocb *req) |
1506 | { | |
1507 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1508 | struct io_ring_ctx *ctx = req->ctx; |
1509 | ||
b8e64b53 PB |
1510 | if (!(req->flags & REQ_F_CREDS)) { |
1511 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1512 | req->creds = get_current_cred(); |
b8e64b53 | 1513 | } |
003e8dcc | 1514 | |
e1d675df PB |
1515 | req->work.list.next = NULL; |
1516 | req->work.flags = 0; | |
feaadc4f PB |
1517 | if (req->flags & REQ_F_FORCE_ASYNC) |
1518 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1519 | ||
1e6fa521 JA |
1520 | if (req->flags & REQ_F_ISREG) { |
1521 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1522 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1523 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1524 | if (def->unbound_nonreg_file) |
1525 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1526 | } | |
e1d675df PB |
1527 | |
1528 | switch (req->opcode) { | |
1529 | case IORING_OP_SPLICE: | |
1530 | case IORING_OP_TEE: | |
e1d675df PB |
1531 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1532 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1533 | break; | |
1534 | } | |
561fb04a | 1535 | } |
cccf0ee8 | 1536 | |
cbdcb435 | 1537 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1538 | { |
cbdcb435 | 1539 | struct io_kiocb *cur; |
54a91f3b | 1540 | |
44eff40a PB |
1541 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1542 | struct io_ring_ctx *ctx = req->ctx; | |
1543 | ||
674ee8e1 | 1544 | spin_lock_irq(&ctx->timeout_lock); |
44eff40a PB |
1545 | io_for_each_link(cur, req) |
1546 | io_prep_async_work(cur); | |
674ee8e1 | 1547 | spin_unlock_irq(&ctx->timeout_lock); |
44eff40a PB |
1548 | } else { |
1549 | io_for_each_link(cur, req) | |
1550 | io_prep_async_work(cur); | |
1551 | } | |
561fb04a JA |
1552 | } |
1553 | ||
fff4e40e PB |
1554 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1555 | { | |
1556 | struct io_submit_state *state = &req->ctx->submit_state; | |
1557 | ||
1558 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); | |
1559 | } | |
1560 | ||
00169246 | 1561 | static void io_queue_async_work(struct io_kiocb *req, bool *dont_use) |
561fb04a | 1562 | { |
a197f664 | 1563 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1564 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1565 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1566 | |
3bfe6106 JA |
1567 | BUG_ON(!tctx); |
1568 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1569 | |
cbdcb435 PB |
1570 | /* init ->work of the whole link before punting */ |
1571 | io_prep_async_link(req); | |
991468dc JA |
1572 | |
1573 | /* | |
1574 | * Not expected to happen, but if we do have a bug where this _can_ | |
1575 | * happen, catch it here and ensure the request is marked as | |
1576 | * canceled. That will make io-wq go through the usual work cancel | |
1577 | * procedure rather than attempt to run this request (or create a new | |
1578 | * worker for it). | |
1579 | */ | |
1580 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1581 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1582 | ||
d07f1e8a PB |
1583 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1584 | &req->work, req->flags); | |
ebf93667 | 1585 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1586 | if (link) |
1587 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1588 | } |
1589 | ||
1ee4160c | 1590 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1591 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1592 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1593 | { |
e8c2bc1f | 1594 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1595 | |
fd9c7bc5 | 1596 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1597 | if (status) |
1598 | req_set_fail(req); | |
01cec8c1 PB |
1599 | atomic_set(&req->ctx->cq_timeouts, |
1600 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1601 | list_del_init(&req->timeout.list); |
d4d19c19 | 1602 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
91c2f697 | 1603 | io_put_req_deferred(req); |
5262f567 JA |
1604 | } |
1605 | } | |
1606 | ||
c072481d | 1607 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1608 | { |
441b8a78 | 1609 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1610 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1611 | struct io_defer_entry, list); | |
de0617e4 | 1612 | |
9cf7c104 | 1613 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1614 | break; |
27dc8338 | 1615 | list_del_init(&de->list); |
907d1df3 | 1616 | io_req_task_queue(de->req); |
27dc8338 | 1617 | kfree(de); |
441b8a78 | 1618 | } |
04518945 PB |
1619 | } |
1620 | ||
c072481d | 1621 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1622 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1623 | { |
441b8a78 | 1624 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1625 | |
79ebeaee | 1626 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1627 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1628 | u32 events_needed, events_got; |
360428f8 | 1629 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1630 | struct io_kiocb, timeout.list); |
de0617e4 | 1631 | |
8eb7e2d0 | 1632 | if (io_is_timeout_noseq(req)) |
360428f8 | 1633 | break; |
f010505b MDG |
1634 | |
1635 | /* | |
1636 | * Since seq can easily wrap around over time, subtract | |
1637 | * the last seq at which timeouts were flushed before comparing. | |
1638 | * Assuming not more than 2^31-1 events have happened since, | |
1639 | * these subtractions won't have wrapped, so we can check if | |
1640 | * target is in [last_seq, current_seq] by comparing the two. | |
1641 | */ | |
1642 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1643 | events_got = seq - ctx->cq_last_tm_flush; | |
1644 | if (events_got < events_needed) | |
360428f8 | 1645 | break; |
bfe68a22 | 1646 | |
135fcde8 | 1647 | list_del_init(&req->timeout.list); |
1ee4160c | 1648 | io_kill_timeout(req, 0); |
f18ee4cf | 1649 | } |
f010505b | 1650 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1651 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1652 | } |
5262f567 | 1653 | |
c072481d | 1654 | static __cold void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1655 | { |
2335f6f5 PB |
1656 | if (ctx->off_timeout_used) |
1657 | io_flush_timeouts(ctx); | |
1658 | if (ctx->drain_active) | |
1659 | io_queue_deferred(ctx); | |
1660 | } | |
1661 | ||
1662 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1663 | { | |
1664 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1665 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1666 | /* order cqe stores with ring update */ |
1667 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1668 | } |
1669 | ||
90554200 JA |
1670 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1671 | { | |
1672 | struct io_rings *r = ctx->rings; | |
1673 | ||
a566c556 | 1674 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1675 | } |
1676 | ||
888aae2e PB |
1677 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1678 | { | |
1679 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1680 | } | |
1681 | ||
d068b506 | 1682 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1683 | { |
75b28aff | 1684 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1685 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1686 | |
115e12e5 SB |
1687 | /* |
1688 | * writes to the cq entry need to come after reading head; the | |
1689 | * control dependency is enough as we're using WRITE_ONCE to | |
1690 | * fill the cq entry | |
1691 | */ | |
a566c556 | 1692 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1693 | return NULL; |
1694 | ||
888aae2e | 1695 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1696 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1697 | } |
1698 | ||
f2842ab5 JA |
1699 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1700 | { | |
44c769de | 1701 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1702 | return false; |
7e55a19c SG |
1703 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1704 | return false; | |
44c769de | 1705 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1706 | } |
1707 | ||
2c5d763c JA |
1708 | /* |
1709 | * This should only get called when at least one event has been posted. | |
1710 | * Some applications rely on the eventfd notification count only changing | |
1711 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1712 | * 1:1 relationship between how many times this function is called (and | |
1713 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1714 | */ | |
b41e9852 | 1715 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1716 | { |
5fd46178 JA |
1717 | /* |
1718 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1719 | * io_should_wake() handle the termination of the loop and only | |
1720 | * wake as many waiters as we need to. | |
1721 | */ | |
1722 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1723 | wake_up_all(&ctx->cq_wait); | |
b41e9852 | 1724 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1725 | eventfd_signal(ctx->cq_ev_fd, 1); |
1726 | } | |
1727 | ||
80c18e4a PB |
1728 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1729 | { | |
c57a91fb PB |
1730 | /* see waitqueue_active() comment */ |
1731 | smp_mb(); | |
1732 | ||
80c18e4a | 1733 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c57a91fb | 1734 | if (waitqueue_active(&ctx->cq_wait)) |
5fd46178 | 1735 | wake_up_all(&ctx->cq_wait); |
80c18e4a PB |
1736 | } |
1737 | if (io_should_trigger_evfd(ctx)) | |
1738 | eventfd_signal(ctx->cq_ev_fd, 1); | |
1739 | } | |
1740 | ||
c4a2ed72 | 1741 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1742 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1743 | { |
b18032bb | 1744 | bool all_flushed, posted; |
1d7bb1d5 | 1745 | |
a566c556 | 1746 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1747 | return false; |
1d7bb1d5 | 1748 | |
b18032bb | 1749 | posted = false; |
79ebeaee | 1750 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1751 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1752 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1753 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1754 | |
1d7bb1d5 JA |
1755 | if (!cqe && !force) |
1756 | break; | |
6c2450ae PB |
1757 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1758 | struct io_overflow_cqe, list); | |
1759 | if (cqe) | |
1760 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1761 | else | |
8f6ed49a PB |
1762 | io_account_cq_overflow(ctx); |
1763 | ||
b18032bb | 1764 | posted = true; |
6c2450ae PB |
1765 | list_del(&ocqe->list); |
1766 | kfree(ocqe); | |
1d7bb1d5 JA |
1767 | } |
1768 | ||
09e88404 PB |
1769 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1770 | if (all_flushed) { | |
5ed7a37d | 1771 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1772 | WRITE_ONCE(ctx->rings->sq_flags, |
1773 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1774 | } |
46930143 | 1775 | |
b18032bb JA |
1776 | if (posted) |
1777 | io_commit_cqring(ctx); | |
79ebeaee | 1778 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1779 | if (posted) |
1780 | io_cqring_ev_posted(ctx); | |
09e88404 | 1781 | return all_flushed; |
1d7bb1d5 JA |
1782 | } |
1783 | ||
90f67366 | 1784 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1785 | { |
ca0a2651 JA |
1786 | bool ret = true; |
1787 | ||
5ed7a37d | 1788 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1789 | /* iopoll syncs against uring_lock, not completion_lock */ |
1790 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1791 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1792 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1793 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1794 | mutex_unlock(&ctx->uring_lock); | |
1795 | } | |
ca0a2651 JA |
1796 | |
1797 | return ret; | |
6c503150 PB |
1798 | } |
1799 | ||
6a290a14 PB |
1800 | /* must to be called somewhat shortly after putting a request */ |
1801 | static inline void io_put_task(struct task_struct *task, int nr) | |
1802 | { | |
1803 | struct io_uring_task *tctx = task->io_uring; | |
1804 | ||
e98e49b2 PB |
1805 | if (likely(task == current)) { |
1806 | tctx->cached_refs += nr; | |
1807 | } else { | |
1808 | percpu_counter_sub(&tctx->inflight, nr); | |
1809 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1810 | wake_up(&tctx->wait); | |
1811 | put_task_struct_many(task, nr); | |
1812 | } | |
6a290a14 PB |
1813 | } |
1814 | ||
9a10867a PB |
1815 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1816 | { | |
1817 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1818 | ||
1819 | percpu_counter_add(&tctx->inflight, refill); | |
1820 | refcount_add(refill, ¤t->usage); | |
1821 | tctx->cached_refs += refill; | |
1822 | } | |
1823 | ||
1824 | static inline void io_get_task_refs(int nr) | |
1825 | { | |
1826 | struct io_uring_task *tctx = current->io_uring; | |
1827 | ||
1828 | tctx->cached_refs -= nr; | |
1829 | if (unlikely(tctx->cached_refs < 0)) | |
1830 | io_task_refs_refill(tctx); | |
1831 | } | |
1832 | ||
d4d19c19 | 1833 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1834 | s32 res, u32 cflags) |
2b188cc1 | 1835 | { |
cce4b8b0 | 1836 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1837 | |
cce4b8b0 PB |
1838 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1839 | if (!ocqe) { | |
1840 | /* | |
1841 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1842 | * or cannot allocate an overflow entry, then we need to drop it | |
1843 | * on the floor. | |
1844 | */ | |
8f6ed49a | 1845 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1846 | return false; |
2b188cc1 | 1847 | } |
cce4b8b0 | 1848 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1849 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1850 | WRITE_ONCE(ctx->rings->sq_flags, |
1851 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1852 | ||
cce4b8b0 | 1853 | } |
d4d19c19 | 1854 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1855 | ocqe->cqe.res = res; |
1856 | ocqe->cqe.flags = cflags; | |
1857 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1858 | return true; | |
2b188cc1 JA |
1859 | } |
1860 | ||
d4d19c19 | 1861 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1862 | s32 res, u32 cflags) |
2b188cc1 JA |
1863 | { |
1864 | struct io_uring_cqe *cqe; | |
1865 | ||
d4d19c19 | 1866 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1867 | |
2b188cc1 JA |
1868 | /* |
1869 | * If we can't get a cq entry, userspace overflowed the | |
1870 | * submission (by quite a lot). Increment the overflow count in | |
1871 | * the ring. | |
1872 | */ | |
d068b506 | 1873 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1874 | if (likely(cqe)) { |
d4d19c19 | 1875 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1876 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1877 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1878 | return true; |
2b188cc1 | 1879 | } |
d4d19c19 | 1880 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1881 | } |
1882 | ||
8d13326e | 1883 | /* not as hot to bloat with inlining */ |
d4d19c19 | 1884 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1885 | s32 res, u32 cflags) |
bcda7baa | 1886 | { |
d4d19c19 | 1887 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1888 | } |
1889 | ||
54daa9b2 PB |
1890 | static void io_req_complete_post(struct io_kiocb *req, s32 res, |
1891 | u32 cflags) | |
2b188cc1 | 1892 | { |
78e19bbe | 1893 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1894 | |
79ebeaee | 1895 | spin_lock(&ctx->completion_lock); |
d4d19c19 | 1896 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1897 | /* |
1898 | * If we're the last reference to this request, add to our locked | |
1899 | * free_list cache. | |
1900 | */ | |
de9b4cca | 1901 | if (req_ref_put_and_test(req)) { |
7a612350 | 1902 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1903 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1904 | io_disarm_next(req); |
1905 | if (req->link) { | |
1906 | io_req_task_queue(req->link); | |
1907 | req->link = NULL; | |
1908 | } | |
1909 | } | |
ab409402 | 1910 | io_req_put_rsrc(req, ctx); |
c7dae4ba JA |
1911 | io_dismantle_req(req); |
1912 | io_put_task(req->task, 1); | |
c2b6c6bc | 1913 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 1914 | ctx->locked_free_nr++; |
180f829f | 1915 | } |
7a612350 | 1916 | io_commit_cqring(ctx); |
79ebeaee | 1917 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 1918 | io_cqring_ev_posted(ctx); |
4e3d9ff9 JA |
1919 | } |
1920 | ||
54daa9b2 PB |
1921 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
1922 | u32 cflags) | |
229a7b63 | 1923 | { |
a38d68db | 1924 | req->result = res; |
d17e56eb | 1925 | req->cflags = cflags; |
e342c807 | 1926 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1927 | } |
1928 | ||
889fca73 | 1929 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 1930 | s32 res, u32 cflags) |
bcda7baa | 1931 | { |
889fca73 PB |
1932 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1933 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1934 | else |
c7dae4ba | 1935 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1936 | } |
1937 | ||
54daa9b2 | 1938 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 1939 | { |
889fca73 | 1940 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1941 | } |
1942 | ||
54daa9b2 | 1943 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 1944 | { |
93d2bcd2 | 1945 | req_set_fail(req); |
f41db273 PB |
1946 | io_req_complete_post(req, res, 0); |
1947 | } | |
1948 | ||
c6d3d9cb PB |
1949 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1950 | { | |
1951 | /* | |
1952 | * We don't submit, fail them all, for that replace hardlinks with | |
1953 | * normal links. Extra REQ_F_LINK is tolerated. | |
1954 | */ | |
1955 | req->flags &= ~REQ_F_HARDLINK; | |
1956 | req->flags |= REQ_F_LINK; | |
1957 | io_req_complete_failed(req, req->result); | |
1958 | } | |
1959 | ||
864ea921 PB |
1960 | /* |
1961 | * Don't initialise the fields below on every allocation, but do that in | |
1962 | * advance and keep them valid across allocations. | |
1963 | */ | |
1964 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1965 | { | |
1966 | req->ctx = ctx; | |
1967 | req->link = NULL; | |
1968 | req->async_data = NULL; | |
1969 | /* not necessary, but safer to zero */ | |
1970 | req->result = 0; | |
1971 | } | |
1972 | ||
dac7a098 | 1973 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1974 | struct io_submit_state *state) |
dac7a098 | 1975 | { |
79ebeaee | 1976 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 1977 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1978 | ctx->locked_free_nr = 0; |
79ebeaee | 1979 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1980 | } |
1981 | ||
dd78f492 | 1982 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1983 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1984 | { |
c7dae4ba | 1985 | struct io_submit_state *state = &ctx->submit_state; |
0ddf92e8 | 1986 | |
c7dae4ba JA |
1987 | /* |
1988 | * If we have more than a batch's worth of requests in our IRQ side | |
1989 | * locked cache, grab the lock and move them over to our submission | |
1990 | * side cache. | |
1991 | */ | |
d0acdee2 | 1992 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 1993 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc | 1994 | return !!state->free_list.next; |
0ddf92e8 JA |
1995 | } |
1996 | ||
5d5901a3 PB |
1997 | /* |
1998 | * A request might get retired back into the request caches even before opcode | |
1999 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
2000 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
2001 | * and with extra caution to not get a request that is still worked on. | |
2002 | */ | |
c072481d | 2003 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 2004 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 2005 | { |
e5d1bc0a | 2006 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 | 2007 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 PB |
2008 | void *reqs[IO_REQ_ALLOC_BATCH]; |
2009 | struct io_kiocb *req; | |
864ea921 | 2010 | int ret, i; |
e5d1bc0a | 2011 | |
c2b6c6bc | 2012 | if (likely(state->free_list.next || io_flush_cached_reqs(ctx))) |
a33ae9ce | 2013 | return true; |
e5d1bc0a | 2014 | |
3ab665b7 | 2015 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 2016 | |
864ea921 PB |
2017 | /* |
2018 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2019 | * retry single alloc to be on the safe side. | |
2020 | */ | |
2021 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
2022 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
2023 | if (!reqs[0]) | |
a33ae9ce | 2024 | return false; |
864ea921 | 2025 | ret = 1; |
2b188cc1 | 2026 | } |
864ea921 | 2027 | |
37f0e767 | 2028 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 PB |
2029 | for (i = 0; i < ret; i++) { |
2030 | req = reqs[i]; | |
2031 | ||
2032 | io_preinit_req(req, ctx); | |
c2b6c6bc | 2033 | wq_stack_add_head(&req->comp_list, &state->free_list); |
3ab665b7 | 2034 | } |
a33ae9ce PB |
2035 | return true; |
2036 | } | |
2037 | ||
2038 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
2039 | { | |
2040 | if (unlikely(!ctx->submit_state.free_list.next)) | |
2041 | return __io_alloc_req_refill(ctx); | |
2042 | return true; | |
2043 | } | |
2044 | ||
2045 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2046 | { | |
2047 | struct io_wq_work_node *node; | |
2048 | ||
2049 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 2050 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
2051 | } |
2052 | ||
e1d767f0 | 2053 | static inline void io_put_file(struct file *file) |
8da11c19 | 2054 | { |
e1d767f0 | 2055 | if (file) |
8da11c19 PB |
2056 | fput(file); |
2057 | } | |
2058 | ||
6b639522 | 2059 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2060 | { |
094bae49 | 2061 | unsigned int flags = req->flags; |
929a3af9 | 2062 | |
867f8fa5 | 2063 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 2064 | io_clean_op(req); |
e1d767f0 PB |
2065 | if (!(flags & REQ_F_FIXED_FILE)) |
2066 | io_put_file(req->file); | |
e65ef56d JA |
2067 | } |
2068 | ||
c072481d | 2069 | static __cold void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2070 | { |
51a4cc11 | 2071 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2072 | |
ab409402 | 2073 | io_req_put_rsrc(req, ctx); |
216578e5 | 2074 | io_dismantle_req(req); |
7c660731 | 2075 | io_put_task(req->task, 1); |
c6ca97b3 | 2076 | |
79ebeaee | 2077 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2078 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2079 | ctx->locked_free_nr++; |
79ebeaee | 2080 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2081 | } |
2082 | ||
f2f87370 PB |
2083 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2084 | { | |
2085 | struct io_kiocb *nxt = req->link; | |
2086 | ||
2087 | req->link = nxt->link; | |
2088 | nxt->link = NULL; | |
2089 | } | |
2090 | ||
33cc89a9 PB |
2091 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2092 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2093 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2094 | { |
33cc89a9 | 2095 | struct io_kiocb *link = req->link; |
f2f87370 | 2096 | |
b97e736a | 2097 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2098 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2099 | |
f2f87370 | 2100 | io_remove_next_linked(req); |
90cd7e42 | 2101 | link->timeout.head = NULL; |
fd9c7bc5 | 2102 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2103 | list_del(&link->timeout.list); |
d4d19c19 PB |
2104 | io_cqring_fill_event(link->ctx, link->user_data, |
2105 | -ECANCELED, 0); | |
91c2f697 | 2106 | io_put_req_deferred(link); |
d4729fbd | 2107 | return true; |
c9abd7ad PB |
2108 | } |
2109 | } | |
d4729fbd | 2110 | return false; |
7c86ffee PB |
2111 | } |
2112 | ||
d148ca4b | 2113 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2114 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2115 | { |
33cc89a9 | 2116 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 2117 | |
f2f87370 | 2118 | req->link = NULL; |
f2f87370 | 2119 | while (link) { |
a8295b98 HX |
2120 | long res = -ECANCELED; |
2121 | ||
2122 | if (link->flags & REQ_F_FAIL) | |
2123 | res = link->result; | |
2124 | ||
f2f87370 PB |
2125 | nxt = link->link; |
2126 | link->link = NULL; | |
2665abfd | 2127 | |
f2f87370 | 2128 | trace_io_uring_fail_link(req, link); |
a8295b98 | 2129 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
91c2f697 | 2130 | io_put_req_deferred(link); |
f2f87370 | 2131 | link = nxt; |
9e645e11 | 2132 | } |
33cc89a9 | 2133 | } |
9e645e11 | 2134 | |
33cc89a9 PB |
2135 | static bool io_disarm_next(struct io_kiocb *req) |
2136 | __must_hold(&req->ctx->completion_lock) | |
2137 | { | |
2138 | bool posted = false; | |
2139 | ||
0756a869 PB |
2140 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2141 | struct io_kiocb *link = req->link; | |
2142 | ||
906c6caa | 2143 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2144 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2145 | io_remove_next_linked(req); | |
2146 | io_cqring_fill_event(link->ctx, link->user_data, | |
2147 | -ECANCELED, 0); | |
2148 | io_put_req_deferred(link); | |
2149 | posted = true; | |
2150 | } | |
2151 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2152 | struct io_ring_ctx *ctx = req->ctx; |
2153 | ||
2154 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2155 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2156 | spin_unlock_irq(&ctx->timeout_lock); |
2157 | } | |
93d2bcd2 | 2158 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2159 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2160 | posted |= (req->link != NULL); |
2161 | io_fail_links(req); | |
2162 | } | |
2163 | return posted; | |
9e645e11 JA |
2164 | } |
2165 | ||
d81499bf PB |
2166 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2167 | { | |
2168 | struct io_ring_ctx *ctx = req->ctx; | |
2169 | bool posted; | |
2170 | ||
2171 | spin_lock(&ctx->completion_lock); | |
2172 | posted = io_disarm_next(req); | |
2173 | if (posted) | |
2174 | io_commit_cqring(req->ctx); | |
2175 | spin_unlock(&ctx->completion_lock); | |
2176 | if (posted) | |
2177 | io_cqring_ev_posted(ctx); | |
2178 | } | |
2179 | ||
2180 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2181 | { |
33cc89a9 | 2182 | struct io_kiocb *nxt; |
944e58bf | 2183 | |
d81499bf PB |
2184 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
2185 | return NULL; | |
9e645e11 JA |
2186 | /* |
2187 | * If LINK is set, we have dependent requests in this chain. If we | |
2188 | * didn't fail this request, queue the first one up, moving any other | |
2189 | * dependencies to the next request. In case of failure, fail the rest | |
2190 | * of the chain. | |
2191 | */ | |
d81499bf PB |
2192 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2193 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2194 | nxt = req->link; |
2195 | req->link = NULL; | |
2196 | return nxt; | |
4d7dd462 | 2197 | } |
9e645e11 | 2198 | |
f237c30a | 2199 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2200 | { |
2201 | if (!ctx) | |
2202 | return; | |
f237c30a | 2203 | if (*locked) { |
c450178d | 2204 | io_submit_flush_completions(ctx); |
2c32395d | 2205 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2206 | *locked = false; |
2c32395d PB |
2207 | } |
2208 | percpu_ref_put(&ctx->refs); | |
2209 | } | |
2210 | ||
7cbf1722 | 2211 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2212 | { |
f237c30a | 2213 | bool locked = false; |
ebd0df2e | 2214 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2215 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2216 | task_work); | |
c40f6379 | 2217 | |
16f72070 | 2218 | while (1) { |
3f18407d PB |
2219 | struct io_wq_work_node *node; |
2220 | ||
c450178d | 2221 | if (!tctx->task_list.first && locked) |
8d4ad41e PB |
2222 | io_submit_flush_completions(ctx); |
2223 | ||
3f18407d | 2224 | spin_lock_irq(&tctx->task_lock); |
c6538be9 | 2225 | node = tctx->task_list.first; |
3f18407d | 2226 | INIT_WQ_LIST(&tctx->task_list); |
6294f368 PB |
2227 | if (!node) |
2228 | tctx->task_running = false; | |
3f18407d | 2229 | spin_unlock_irq(&tctx->task_lock); |
6294f368 PB |
2230 | if (!node) |
2231 | break; | |
3f18407d | 2232 | |
6294f368 | 2233 | do { |
3f18407d PB |
2234 | struct io_wq_work_node *next = node->next; |
2235 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2236 | io_task_work.node); | |
2237 | ||
2238 | if (req->ctx != ctx) { | |
f237c30a | 2239 | ctx_flush_and_put(ctx, &locked); |
3f18407d | 2240 | ctx = req->ctx; |
126180b9 PB |
2241 | /* if not contended, grab and improve batching */ |
2242 | locked = mutex_trylock(&ctx->uring_lock); | |
3f18407d PB |
2243 | percpu_ref_get(&ctx->refs); |
2244 | } | |
f237c30a | 2245 | req->io_task_work.func(req, &locked); |
3f18407d | 2246 | node = next; |
6294f368 PB |
2247 | } while (node); |
2248 | ||
7cbf1722 | 2249 | cond_resched(); |
3f18407d | 2250 | } |
ebd0df2e | 2251 | |
f237c30a | 2252 | ctx_flush_and_put(ctx, &locked); |
7cbf1722 JA |
2253 | } |
2254 | ||
e09ee510 | 2255 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 2256 | { |
c15b79de | 2257 | struct task_struct *tsk = req->task; |
7cbf1722 | 2258 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2259 | enum task_work_notify_mode notify; |
e09ee510 | 2260 | struct io_wq_work_node *node; |
0b81e80c | 2261 | unsigned long flags; |
6294f368 | 2262 | bool running; |
7cbf1722 JA |
2263 | |
2264 | WARN_ON_ONCE(!tctx); | |
2265 | ||
0b81e80c | 2266 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2267 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
6294f368 PB |
2268 | running = tctx->task_running; |
2269 | if (!running) | |
2270 | tctx->task_running = true; | |
0b81e80c | 2271 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2272 | |
2273 | /* task_work already pending, we're done */ | |
6294f368 | 2274 | if (running) |
e09ee510 | 2275 | return; |
7cbf1722 | 2276 | |
c15b79de PB |
2277 | /* |
2278 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2279 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2280 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2281 | * will do the job. | |
2282 | */ | |
2283 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
d97ec623 PB |
2284 | if (likely(!task_work_add(tsk, &tctx->task_work, notify))) { |
2285 | if (notify == TWA_NONE) | |
2286 | wake_up_process(tsk); | |
e09ee510 | 2287 | return; |
c15b79de | 2288 | } |
2215bed9 | 2289 | |
0b81e80c | 2290 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2291 | tctx->task_running = false; |
e09ee510 PB |
2292 | node = tctx->task_list.first; |
2293 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2294 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2295 | |
e09ee510 PB |
2296 | while (node) { |
2297 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2298 | node = node->next; | |
2299 | if (llist_add(&req->io_task_work.fallback_node, | |
2300 | &req->ctx->fallback_llist)) | |
2301 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2302 | } | |
eab30c4d PB |
2303 | } |
2304 | ||
f237c30a | 2305 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2306 | { |
87ceb6a6 | 2307 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2308 | |
b18a1a45 | 2309 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2310 | io_tw_lock(ctx, locked); |
2593553a | 2311 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2312 | } |
2313 | ||
f237c30a | 2314 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2315 | { |
2316 | struct io_ring_ctx *ctx = req->ctx; | |
2317 | ||
f237c30a | 2318 | io_tw_lock(ctx, locked); |
316319e8 | 2319 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2320 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2321 | __io_queue_sqe(req); |
81b6d05c | 2322 | else |
2593553a | 2323 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2324 | } |
2325 | ||
2c4b8eb6 | 2326 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2327 | { |
2c4b8eb6 | 2328 | req->result = ret; |
5b0a6acc | 2329 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2330 | io_req_task_work_add(req); |
c40f6379 JA |
2331 | } |
2332 | ||
2c4b8eb6 | 2333 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2334 | { |
5b0a6acc | 2335 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2336 | io_req_task_work_add(req); |
a3df7698 PB |
2337 | } |
2338 | ||
773af691 JA |
2339 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2340 | { | |
2341 | req->io_task_work.func = io_queue_async_work; | |
2342 | io_req_task_work_add(req); | |
2343 | } | |
2344 | ||
f2f87370 | 2345 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2346 | { |
9b5f7bd9 | 2347 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2348 | |
2349 | if (nxt) | |
906a8c3f | 2350 | io_req_task_queue(nxt); |
c69f8dbe JL |
2351 | } |
2352 | ||
c3524383 | 2353 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2354 | { |
c3524383 PB |
2355 | io_queue_next(req); |
2356 | __io_free_req(req); | |
2357 | } | |
8766dd51 | 2358 | |
f237c30a PB |
2359 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2360 | { | |
2361 | io_free_req(req); | |
2362 | } | |
2363 | ||
3aa83bfb | 2364 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 2365 | struct io_wq_work_node *node) |
3aa83bfb | 2366 | __must_hold(&ctx->uring_lock) |
5af1d13e | 2367 | { |
d4b7a5ef | 2368 | struct task_struct *task = NULL; |
37f0e767 | 2369 | int task_refs = 0; |
5af1d13e | 2370 | |
3aa83bfb PB |
2371 | do { |
2372 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2373 | comp_list); | |
2d6500d4 | 2374 | |
def77acf | 2375 | if (unlikely(req->flags & REQ_F_REFCOUNT)) { |
c1e53a69 | 2376 | node = req->comp_list.next; |
def77acf PB |
2377 | if (!req_ref_put_and_test(req)) |
2378 | continue; | |
c1e53a69 | 2379 | } |
2d6500d4 | 2380 | |
ab409402 | 2381 | io_req_put_rsrc_locked(req, ctx); |
d4b7a5ef PB |
2382 | io_queue_next(req); |
2383 | io_dismantle_req(req); | |
5af1d13e | 2384 | |
d4b7a5ef PB |
2385 | if (req->task != task) { |
2386 | if (task) | |
2387 | io_put_task(task, task_refs); | |
2388 | task = req->task; | |
2389 | task_refs = 0; | |
2390 | } | |
2391 | task_refs++; | |
c1e53a69 | 2392 | node = req->comp_list.next; |
d4b7a5ef | 2393 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
3aa83bfb | 2394 | } while (node); |
d4b7a5ef | 2395 | |
d4b7a5ef PB |
2396 | if (task) |
2397 | io_put_task(task, task_refs); | |
7a743e22 PB |
2398 | } |
2399 | ||
c450178d | 2400 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2401 | __must_hold(&ctx->uring_lock) |
905c172f | 2402 | { |
6f33b0bc | 2403 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 2404 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 2405 | |
79ebeaee | 2406 | spin_lock(&ctx->completion_lock); |
6f33b0bc PB |
2407 | wq_list_for_each(node, prev, &state->compl_reqs) { |
2408 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2409 | comp_list); | |
5182ed2e | 2410 | |
d4d19c19 | 2411 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
d17e56eb | 2412 | req->cflags); |
905c172f PB |
2413 | } |
2414 | io_commit_cqring(ctx); | |
79ebeaee | 2415 | spin_unlock(&ctx->completion_lock); |
905c172f | 2416 | io_cqring_ev_posted(ctx); |
5182ed2e | 2417 | |
1cce17ac | 2418 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 2419 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
2420 | } |
2421 | ||
ba816ad6 JA |
2422 | /* |
2423 | * Drop reference to request, return next in chain (if there is one) if this | |
2424 | * was the last reference to this request. | |
2425 | */ | |
0d85035a | 2426 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2427 | { |
9b5f7bd9 PB |
2428 | struct io_kiocb *nxt = NULL; |
2429 | ||
de9b4cca | 2430 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2431 | nxt = io_req_find_next(req); |
4d7dd462 | 2432 | __io_free_req(req); |
2a44f467 | 2433 | } |
9b5f7bd9 | 2434 | return nxt; |
2b188cc1 JA |
2435 | } |
2436 | ||
0d85035a | 2437 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2438 | { |
de9b4cca | 2439 | if (req_ref_put_and_test(req)) |
e65ef56d | 2440 | io_free_req(req); |
2b188cc1 JA |
2441 | } |
2442 | ||
91c2f697 | 2443 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2444 | { |
91c2f697 | 2445 | if (req_ref_put_and_test(req)) { |
f237c30a | 2446 | req->io_task_work.func = io_free_req_work; |
543af3a1 PB |
2447 | io_req_task_work_add(req); |
2448 | } | |
216578e5 PB |
2449 | } |
2450 | ||
6c503150 | 2451 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2452 | { |
2453 | /* See comment at the top of this file */ | |
2454 | smp_rmb(); | |
e23de15f | 2455 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2456 | } |
2457 | ||
fb5ccc98 PB |
2458 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2459 | { | |
2460 | struct io_rings *rings = ctx->rings; | |
2461 | ||
2462 | /* make sure SQ entry isn't read before tail */ | |
2463 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2464 | } | |
2465 | ||
8ff069bf | 2466 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2467 | { |
8ff069bf | 2468 | unsigned int cflags; |
e94f141b | 2469 | |
bcda7baa JA |
2470 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2471 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2472 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2473 | kfree(kbuf); |
2474 | return cflags; | |
e94f141b JA |
2475 | } |
2476 | ||
8ff069bf | 2477 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2478 | { |
ae421d93 PB |
2479 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
2480 | return 0; | |
30d51dd4 | 2481 | return io_put_kbuf(req, req->kbuf); |
8ff069bf PB |
2482 | } |
2483 | ||
4c6e277c JA |
2484 | static inline bool io_run_task_work(void) |
2485 | { | |
ef98eb04 | 2486 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2487 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2488 | tracehook_notify_signal(); |
4c6e277c JA |
2489 | return true; |
2490 | } | |
2491 | ||
2492 | return false; | |
bcda7baa JA |
2493 | } |
2494 | ||
5ba3c874 | 2495 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 2496 | { |
5eef4e87 | 2497 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 2498 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 2499 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 2500 | int nr_events = 0; |
def596e9 JA |
2501 | |
2502 | /* | |
2503 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 2504 | * off our complete list. |
def596e9 | 2505 | */ |
87a115fb | 2506 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 2507 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2508 | |
5eef4e87 PB |
2509 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
2510 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 2511 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2512 | int ret; |
def596e9 JA |
2513 | |
2514 | /* | |
581f9810 BM |
2515 | * Move completed and retryable entries to our local lists. |
2516 | * If we find a request that requires polling, break out | |
2517 | * and complete those lists first, if we have entries there. | |
def596e9 | 2518 | */ |
e3f721e6 | 2519 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2520 | break; |
2521 | ||
b688f11e | 2522 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
2523 | if (unlikely(ret < 0)) |
2524 | return ret; | |
2525 | else if (ret) | |
ef99b2d3 | 2526 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2527 | |
3aadc23e | 2528 | /* iopoll may have completed current req */ |
b688f11e JA |
2529 | if (!rq_list_empty(iob.req_list) || |
2530 | READ_ONCE(req->iopoll_completed)) | |
e3f721e6 | 2531 | break; |
def596e9 JA |
2532 | } |
2533 | ||
b688f11e JA |
2534 | if (!rq_list_empty(iob.req_list)) |
2535 | iob.complete(&iob); | |
5eef4e87 PB |
2536 | else if (!pos) |
2537 | return 0; | |
def596e9 | 2538 | |
5eef4e87 PB |
2539 | prev = start; |
2540 | wq_list_for_each_resume(pos, prev) { | |
2541 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
2542 | ||
b3fa03fd PB |
2543 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
2544 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 2545 | break; |
b3fa03fd | 2546 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
f5ed3bcd | 2547 | io_put_rw_kbuf(req)); |
e3f721e6 PB |
2548 | nr_events++; |
2549 | } | |
def596e9 | 2550 | |
f5ed3bcd PB |
2551 | if (unlikely(!nr_events)) |
2552 | return 0; | |
2553 | ||
2554 | io_commit_cqring(ctx); | |
2555 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 2556 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 2557 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 2558 | io_free_batch_list(ctx, pos); |
5ba3c874 | 2559 | return nr_events; |
def596e9 JA |
2560 | } |
2561 | ||
def596e9 JA |
2562 | /* |
2563 | * We can't just wait for polled events to come to us, we have to actively | |
2564 | * find and complete them. | |
2565 | */ | |
c072481d | 2566 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2567 | { |
2568 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2569 | return; | |
2570 | ||
2571 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 2572 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 2573 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 2574 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 2575 | break; |
08f5439f JA |
2576 | /* |
2577 | * Ensure we allow local-to-the-cpu processing to take place, | |
2578 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2579 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2580 | */ |
3fcee5a6 PB |
2581 | if (need_resched()) { |
2582 | mutex_unlock(&ctx->uring_lock); | |
2583 | cond_resched(); | |
2584 | mutex_lock(&ctx->uring_lock); | |
2585 | } | |
def596e9 JA |
2586 | } |
2587 | mutex_unlock(&ctx->uring_lock); | |
2588 | } | |
2589 | ||
7668b92a | 2590 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2591 | { |
7668b92a | 2592 | unsigned int nr_events = 0; |
e9979b36 | 2593 | int ret = 0; |
500f9fba | 2594 | |
c7849be9 XW |
2595 | /* |
2596 | * We disallow the app entering submit/complete with polling, but we | |
2597 | * still need to lock the ring to prevent racing with polled issue | |
2598 | * that got punted to a workqueue. | |
2599 | */ | |
2600 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2601 | /* |
2602 | * Don't enter poll loop if we already have events pending. | |
2603 | * If we do, we can potentially be spinning for commands that | |
2604 | * already triggered a CQE (eg in error). | |
2605 | */ | |
5ed7a37d | 2606 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2607 | __io_cqring_overflow_flush(ctx, false); |
2608 | if (io_cqring_events(ctx)) | |
2609 | goto out; | |
def596e9 | 2610 | do { |
500f9fba JA |
2611 | /* |
2612 | * If a submit got punted to a workqueue, we can have the | |
2613 | * application entering polling for a command before it gets | |
2614 | * issued. That app will hold the uring_lock for the duration | |
2615 | * of the poll right here, so we need to take a breather every | |
2616 | * now and then to ensure that the issue has a chance to add | |
2617 | * the poll to the issued list. Otherwise we can spin here | |
2618 | * forever, while the workqueue is stuck trying to acquire the | |
2619 | * very same mutex. | |
2620 | */ | |
5eef4e87 | 2621 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2622 | u32 tail = ctx->cached_cq_tail; |
2623 | ||
500f9fba | 2624 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2625 | io_run_task_work(); |
500f9fba | 2626 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2627 | |
8f487ef2 PB |
2628 | /* some requests don't go through iopoll_list */ |
2629 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 2630 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 2631 | break; |
500f9fba | 2632 | } |
5ba3c874 PB |
2633 | ret = io_do_iopoll(ctx, !min); |
2634 | if (ret < 0) | |
2635 | break; | |
2636 | nr_events += ret; | |
2637 | ret = 0; | |
2638 | } while (nr_events < min && !need_resched()); | |
f39c8a5b | 2639 | out: |
500f9fba | 2640 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2641 | return ret; |
2642 | } | |
2643 | ||
491381ce | 2644 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2645 | { |
491381ce JA |
2646 | /* |
2647 | * Tell lockdep we inherited freeze protection from submission | |
2648 | * thread. | |
2649 | */ | |
2650 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2651 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2652 | |
1c98679d PB |
2653 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2654 | sb_end_write(sb); | |
2b188cc1 JA |
2655 | } |
2656 | } | |
2657 | ||
b63534c4 | 2658 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2659 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2660 | { |
ab454438 | 2661 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2662 | |
d886e185 | 2663 | if (!req_has_async_data(req)) |
ab454438 | 2664 | return !io_req_prep_async(req); |
538941e2 | 2665 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 2666 | return true; |
b63534c4 | 2667 | } |
b63534c4 | 2668 | |
3e6a0d3c | 2669 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2670 | { |
355afaeb | 2671 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2672 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2673 | |
355afaeb JA |
2674 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2675 | return false; | |
3e6a0d3c JA |
2676 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2677 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2678 | return false; |
7c977a58 JA |
2679 | /* |
2680 | * If ref is dying, we might be running poll reap from the exit work. | |
2681 | * Don't attempt to reissue from that path, just let it fail with | |
2682 | * -EAGAIN. | |
2683 | */ | |
3e6a0d3c JA |
2684 | if (percpu_ref_is_dying(&ctx->refs)) |
2685 | return false; | |
ef046888 JA |
2686 | /* |
2687 | * Play it safe and assume not safe to re-import and reissue if we're | |
2688 | * not in the original thread group (or in task context). | |
2689 | */ | |
2690 | if (!same_thread_group(req->task, current) || !in_task()) | |
2691 | return false; | |
3e6a0d3c JA |
2692 | return true; |
2693 | } | |
e82ad485 | 2694 | #else |
a1ff1e3f | 2695 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2696 | { |
2697 | return false; | |
2698 | } | |
e82ad485 | 2699 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2700 | { |
b63534c4 JA |
2701 | return false; |
2702 | } | |
3e6a0d3c | 2703 | #endif |
b63534c4 | 2704 | |
8ef12efe | 2705 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2706 | { |
b65c128f PB |
2707 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2708 | kiocb_end_write(req); | |
258f3a7f | 2709 | if (unlikely(res != req->result)) { |
9532b99b PB |
2710 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
2711 | io_rw_should_reissue(req)) { | |
2712 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2713 | return true; |
9532b99b | 2714 | } |
93d2bcd2 | 2715 | req_set_fail(req); |
8ef12efe | 2716 | req->result = res; |
9532b99b | 2717 | } |
8ef12efe JA |
2718 | return false; |
2719 | } | |
2720 | ||
f237c30a | 2721 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2722 | { |
126180b9 | 2723 | unsigned int cflags = io_put_rw_kbuf(req); |
54daa9b2 | 2724 | int res = req->result; |
126180b9 PB |
2725 | |
2726 | if (*locked) { | |
126180b9 | 2727 | io_req_complete_state(req, res, cflags); |
fff4e40e | 2728 | io_req_add_compl_list(req); |
126180b9 PB |
2729 | } else { |
2730 | io_req_complete_post(req, res, cflags); | |
2731 | } | |
8ef12efe JA |
2732 | } |
2733 | ||
2734 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2735 | unsigned int issue_flags) | |
2736 | { | |
2737 | if (__io_complete_rw_common(req, res)) | |
2738 | return; | |
63637853 | 2739 | __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); |
ba816ad6 JA |
2740 | } |
2741 | ||
6b19b766 | 2742 | static void io_complete_rw(struct kiocb *kiocb, long res) |
ba816ad6 | 2743 | { |
9adbd45d | 2744 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2745 | |
8ef12efe JA |
2746 | if (__io_complete_rw_common(req, res)) |
2747 | return; | |
2748 | req->result = res; | |
2749 | req->io_task_work.func = io_req_task_complete; | |
2750 | io_req_task_work_add(req); | |
2b188cc1 JA |
2751 | } |
2752 | ||
6b19b766 | 2753 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) |
def596e9 | 2754 | { |
9adbd45d | 2755 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2756 | |
491381ce JA |
2757 | if (kiocb->ki_flags & IOCB_WRITE) |
2758 | kiocb_end_write(req); | |
9532b99b | 2759 | if (unlikely(res != req->result)) { |
b66ceaf3 PB |
2760 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
2761 | req->flags |= REQ_F_REISSUE; | |
2762 | return; | |
9532b99b | 2763 | } |
258f3a7f | 2764 | req->result = res; |
8c130827 | 2765 | } |
bbde017a | 2766 | |
b3fa03fd PB |
2767 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
2768 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
2769 | } |
2770 | ||
2771 | /* | |
2772 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2773 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2774 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2775 | * accessing the kiocb cookie. |
2776 | */ | |
9882131c | 2777 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
2778 | { |
2779 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 2780 | const bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
cb3d8972 PB |
2781 | |
2782 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
3b44b371 | 2783 | if (unlikely(needs_lock)) |
cb3d8972 | 2784 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
2785 | |
2786 | /* | |
2787 | * Track whether we have multiple files in our lists. This will impact | |
2788 | * how we do polling eventually, not spinning if we're on potentially | |
2789 | * different devices. | |
2790 | */ | |
5eef4e87 | 2791 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2792 | ctx->poll_multi_queue = false; |
2793 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
2794 | struct io_kiocb *list_req; |
2795 | ||
5eef4e87 PB |
2796 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
2797 | comp_list); | |
30da1b45 | 2798 | if (list_req->file != req->file) |
915b3dde | 2799 | ctx->poll_multi_queue = true; |
def596e9 JA |
2800 | } |
2801 | ||
2802 | /* | |
2803 | * For fast devices, IO may have already completed. If it has, add | |
2804 | * it to the front so we find it first. | |
2805 | */ | |
65a6543d | 2806 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 2807 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 2808 | else |
5eef4e87 | 2809 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 2810 | |
3b44b371 | 2811 | if (unlikely(needs_lock)) { |
cb3d8972 PB |
2812 | /* |
2813 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2814 | * in sq thread task context or in io worker task context. If | |
2815 | * current task context is sq thread, we don't need to check | |
2816 | * whether should wake up sq thread. | |
2817 | */ | |
2818 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2819 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2820 | wake_up(&ctx->sq_data->wait); | |
2821 | ||
2822 | mutex_unlock(&ctx->uring_lock); | |
2823 | } | |
def596e9 JA |
2824 | } |
2825 | ||
4503b767 JA |
2826 | static bool io_bdev_nowait(struct block_device *bdev) |
2827 | { | |
9ba0d0c8 | 2828 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2829 | } |
2830 | ||
2b188cc1 JA |
2831 | /* |
2832 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2833 | * any file. For now, just ensure that anything potentially problematic is done | |
2834 | * inline. | |
2835 | */ | |
88459b50 | 2836 | static bool __io_file_supports_nowait(struct file *file, umode_t mode) |
2b188cc1 | 2837 | { |
4503b767 | 2838 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2839 | if (IS_ENABLED(CONFIG_BLOCK) && |
2840 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2841 | return true; |
2842 | return false; | |
2843 | } | |
976517f1 | 2844 | if (S_ISSOCK(mode)) |
2b188cc1 | 2845 | return true; |
4503b767 | 2846 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2847 | if (IS_ENABLED(CONFIG_BLOCK) && |
2848 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2849 | file->f_op != &io_uring_fops) |
2850 | return true; | |
2851 | return false; | |
2852 | } | |
2b188cc1 | 2853 | |
c5b85625 JA |
2854 | /* any ->read/write should understand O_NONBLOCK */ |
2855 | if (file->f_flags & O_NONBLOCK) | |
2856 | return true; | |
35645ac3 | 2857 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 | 2858 | } |
c5b85625 | 2859 | |
88459b50 PB |
2860 | /* |
2861 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2862 | * any file. For now, just ensure that anything potentially problematic is done | |
2863 | * inline. | |
2864 | */ | |
2865 | static unsigned int io_file_get_flags(struct file *file) | |
2866 | { | |
2867 | umode_t mode = file_inode(file)->i_mode; | |
2868 | unsigned int res = 0; | |
af197f50 | 2869 | |
88459b50 PB |
2870 | if (S_ISREG(mode)) |
2871 | res |= FFS_ISREG; | |
2872 | if (__io_file_supports_nowait(file, mode)) | |
2873 | res |= FFS_NOWAIT; | |
2874 | return res; | |
2b188cc1 JA |
2875 | } |
2876 | ||
35645ac3 | 2877 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 2878 | { |
88459b50 | 2879 | return req->flags & REQ_F_SUPPORT_NOWAIT; |
7b29f92d JA |
2880 | } |
2881 | ||
b9a6b8f9 | 2882 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2883 | { |
def596e9 | 2884 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2885 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2886 | struct file *file = req->file; |
09bb8394 JA |
2887 | unsigned ioprio; |
2888 | int ret; | |
2b188cc1 | 2889 | |
88459b50 PB |
2890 | if (!io_req_ffs_set(req)) |
2891 | req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; | |
491381ce | 2892 | |
2b188cc1 | 2893 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2894 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2895 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2896 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2897 | } |
5cb03d63 | 2898 | kiocb->ki_flags = iocb_flags(file); |
3e577dcd PB |
2899 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); |
2900 | if (unlikely(ret)) | |
2901 | return ret; | |
2b188cc1 | 2902 | |
5d329e12 JA |
2903 | /* |
2904 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
2905 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
2906 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
2907 | */ | |
2908 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
35645ac3 | 2909 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) |
75c668cd PB |
2910 | req->flags |= REQ_F_NOWAIT; |
2911 | ||
def596e9 | 2912 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
5cb03d63 | 2913 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) |
09bb8394 | 2914 | return -EOPNOTSUPP; |
2b188cc1 | 2915 | |
394918eb | 2916 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
def596e9 | 2917 | kiocb->ki_complete = io_complete_rw_iopoll; |
65a6543d | 2918 | req->iopoll_completed = 0; |
def596e9 | 2919 | } else { |
09bb8394 JA |
2920 | if (kiocb->ki_flags & IOCB_HIPRI) |
2921 | return -EINVAL; | |
def596e9 JA |
2922 | kiocb->ki_complete = io_complete_rw; |
2923 | } | |
9adbd45d | 2924 | |
fb27274a PB |
2925 | ioprio = READ_ONCE(sqe->ioprio); |
2926 | if (ioprio) { | |
2927 | ret = ioprio_check_cap(ioprio); | |
2928 | if (ret) | |
2929 | return ret; | |
2930 | ||
2931 | kiocb->ki_ioprio = ioprio; | |
2932 | } else { | |
2933 | kiocb->ki_ioprio = get_current_ioprio(); | |
eae071c9 PB |
2934 | } |
2935 | ||
578c0ee2 | 2936 | req->imu = NULL; |
3529d8c2 JA |
2937 | req->rw.addr = READ_ONCE(sqe->addr); |
2938 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2939 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2940 | return 0; |
2b188cc1 JA |
2941 | } |
2942 | ||
2943 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2944 | { | |
2945 | switch (ret) { | |
2946 | case -EIOCBQUEUED: | |
2947 | break; | |
2948 | case -ERESTARTSYS: | |
2949 | case -ERESTARTNOINTR: | |
2950 | case -ERESTARTNOHAND: | |
2951 | case -ERESTART_RESTARTBLOCK: | |
2952 | /* | |
2953 | * We can't just restart the syscall, since previously | |
2954 | * submitted sqes may already be in progress. Just fail this | |
2955 | * IO with EINTR. | |
2956 | */ | |
2957 | ret = -EINTR; | |
df561f66 | 2958 | fallthrough; |
2b188cc1 | 2959 | default: |
6b19b766 | 2960 | kiocb->ki_complete(kiocb, ret); |
2b188cc1 JA |
2961 | } |
2962 | } | |
2963 | ||
a1d7c393 | 2964 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2965 | unsigned int issue_flags) |
ba816ad6 | 2966 | { |
ba04291e | 2967 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2968 | struct io_async_rw *io = req->async_data; |
ba04291e | 2969 | |
227c0c96 | 2970 | /* add previously done IO, if any */ |
d886e185 | 2971 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 2972 | if (ret < 0) |
e8c2bc1f | 2973 | ret = io->bytes_done; |
227c0c96 | 2974 | else |
e8c2bc1f | 2975 | ret += io->bytes_done; |
227c0c96 JA |
2976 | } |
2977 | ||
ba04291e JA |
2978 | if (req->flags & REQ_F_CUR_POS) |
2979 | req->file->f_pos = kiocb->ki_pos; | |
b66ceaf3 | 2980 | if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) |
889fca73 | 2981 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2982 | else |
2983 | io_rw_done(kiocb, ret); | |
97284637 | 2984 | |
b66ceaf3 | 2985 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 2986 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2987 | if (io_resubmit_prep(req)) { |
773af691 | 2988 | io_req_task_queue_reissue(req); |
8c130827 | 2989 | } else { |
b66ceaf3 PB |
2990 | unsigned int cflags = io_put_rw_kbuf(req); |
2991 | struct io_ring_ctx *ctx = req->ctx; | |
2992 | ||
93d2bcd2 | 2993 | req_set_fail(req); |
3b44b371 | 2994 | if (issue_flags & IO_URING_F_UNLOCKED) { |
b66ceaf3 PB |
2995 | mutex_lock(&ctx->uring_lock); |
2996 | __io_req_complete(req, issue_flags, ret, cflags); | |
2997 | mutex_unlock(&ctx->uring_lock); | |
2998 | } else { | |
2999 | __io_req_complete(req, issue_flags, ret, cflags); | |
3000 | } | |
97284637 PB |
3001 | } |
3002 | } | |
ba816ad6 JA |
3003 | } |
3004 | ||
eae071c9 PB |
3005 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3006 | struct io_mapped_ubuf *imu) | |
edafccee | 3007 | { |
9adbd45d | 3008 | size_t len = req->rw.len; |
75769e3f | 3009 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 3010 | size_t offset; |
edafccee | 3011 | |
75769e3f | 3012 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
3013 | return -EFAULT; |
3014 | /* not inside the mapped region */ | |
4751f53d | 3015 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
3016 | return -EFAULT; |
3017 | ||
3018 | /* | |
3019 | * May not be a start of buffer, set size appropriately | |
3020 | * and advance us to the beginning. | |
3021 | */ | |
3022 | offset = buf_addr - imu->ubuf; | |
3023 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3024 | |
3025 | if (offset) { | |
3026 | /* | |
3027 | * Don't use iov_iter_advance() here, as it's really slow for | |
3028 | * using the latter parts of a big fixed buffer - it iterates | |
3029 | * over each segment manually. We can cheat a bit here, because | |
3030 | * we know that: | |
3031 | * | |
3032 | * 1) it's a BVEC iter, we set it up | |
3033 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3034 | * first and last bvec | |
3035 | * | |
3036 | * So just find our index, and adjust the iterator afterwards. | |
3037 | * If the offset is within the first bvec (or the whole first | |
3038 | * bvec, just use iov_iter_advance(). This makes it easier | |
3039 | * since we can just skip the first segment, which may not | |
3040 | * be PAGE_SIZE aligned. | |
3041 | */ | |
3042 | const struct bio_vec *bvec = imu->bvec; | |
3043 | ||
3044 | if (offset <= bvec->bv_len) { | |
3045 | iov_iter_advance(iter, offset); | |
3046 | } else { | |
3047 | unsigned long seg_skip; | |
3048 | ||
3049 | /* skip first vec */ | |
3050 | offset -= bvec->bv_len; | |
3051 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3052 | ||
3053 | iter->bvec = bvec + seg_skip; | |
3054 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3055 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3056 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3057 | } |
3058 | } | |
3059 | ||
847595de | 3060 | return 0; |
edafccee JA |
3061 | } |
3062 | ||
eae071c9 PB |
3063 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
3064 | { | |
eae071c9 PB |
3065 | struct io_mapped_ubuf *imu = req->imu; |
3066 | u16 index, buf_index = req->buf_index; | |
3067 | ||
3068 | if (likely(!imu)) { | |
578c0ee2 PB |
3069 | struct io_ring_ctx *ctx = req->ctx; |
3070 | ||
eae071c9 PB |
3071 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3072 | return -EFAULT; | |
578c0ee2 | 3073 | io_req_set_rsrc_node(req, ctx); |
eae071c9 PB |
3074 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3075 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3076 | req->imu = imu; | |
3077 | } | |
3078 | return __io_import_fixed(req, rw, iter, imu); | |
3079 | } | |
3080 | ||
bcda7baa JA |
3081 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3082 | { | |
3083 | if (needs_lock) | |
3084 | mutex_unlock(&ctx->uring_lock); | |
3085 | } | |
3086 | ||
3087 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3088 | { | |
3089 | /* | |
3090 | * "Normal" inline submissions always hold the uring_lock, since we | |
3091 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3092 | * The only exception is when we've detached the request and issue it | |
3093 | * from an async worker thread, grab the lock for that case. | |
3094 | */ | |
3095 | if (needs_lock) | |
3096 | mutex_lock(&ctx->uring_lock); | |
3097 | } | |
3098 | ||
3099 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
51aac424 | 3100 | int bgid, unsigned int issue_flags) |
bcda7baa | 3101 | { |
30d51dd4 | 3102 | struct io_buffer *kbuf = req->kbuf; |
bcda7baa | 3103 | struct io_buffer *head; |
3b44b371 | 3104 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
bcda7baa JA |
3105 | |
3106 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3107 | return kbuf; | |
3108 | ||
3109 | io_ring_submit_lock(req->ctx, needs_lock); | |
3110 | ||
3111 | lockdep_assert_held(&req->ctx->uring_lock); | |
3112 | ||
9e15c3a0 | 3113 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3114 | if (head) { |
3115 | if (!list_empty(&head->list)) { | |
3116 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3117 | list); | |
3118 | list_del(&kbuf->list); | |
3119 | } else { | |
3120 | kbuf = head; | |
9e15c3a0 | 3121 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3122 | } |
3123 | if (*len > kbuf->len) | |
3124 | *len = kbuf->len; | |
30d51dd4 PB |
3125 | req->flags |= REQ_F_BUFFER_SELECTED; |
3126 | req->kbuf = kbuf; | |
bcda7baa JA |
3127 | } else { |
3128 | kbuf = ERR_PTR(-ENOBUFS); | |
3129 | } | |
3130 | ||
3131 | io_ring_submit_unlock(req->ctx, needs_lock); | |
bcda7baa JA |
3132 | return kbuf; |
3133 | } | |
3134 | ||
4d954c25 | 3135 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3136 | unsigned int issue_flags) |
4d954c25 JA |
3137 | { |
3138 | struct io_buffer *kbuf; | |
4f4eeba8 | 3139 | u16 bgid; |
4d954c25 | 3140 | |
4f4eeba8 | 3141 | bgid = req->buf_index; |
51aac424 | 3142 | kbuf = io_buffer_select(req, len, bgid, issue_flags); |
4d954c25 JA |
3143 | if (IS_ERR(kbuf)) |
3144 | return kbuf; | |
4d954c25 JA |
3145 | return u64_to_user_ptr(kbuf->addr); |
3146 | } | |
3147 | ||
3148 | #ifdef CONFIG_COMPAT | |
3149 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3150 | unsigned int issue_flags) |
4d954c25 JA |
3151 | { |
3152 | struct compat_iovec __user *uiov; | |
3153 | compat_ssize_t clen; | |
3154 | void __user *buf; | |
3155 | ssize_t len; | |
3156 | ||
3157 | uiov = u64_to_user_ptr(req->rw.addr); | |
3158 | if (!access_ok(uiov, sizeof(*uiov))) | |
3159 | return -EFAULT; | |
3160 | if (__get_user(clen, &uiov->iov_len)) | |
3161 | return -EFAULT; | |
3162 | if (clen < 0) | |
3163 | return -EINVAL; | |
3164 | ||
3165 | len = clen; | |
51aac424 | 3166 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3167 | if (IS_ERR(buf)) |
3168 | return PTR_ERR(buf); | |
3169 | iov[0].iov_base = buf; | |
3170 | iov[0].iov_len = (compat_size_t) len; | |
3171 | return 0; | |
3172 | } | |
3173 | #endif | |
3174 | ||
3175 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3176 | unsigned int issue_flags) |
4d954c25 JA |
3177 | { |
3178 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3179 | void __user *buf; | |
3180 | ssize_t len; | |
3181 | ||
3182 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3183 | return -EFAULT; | |
3184 | ||
3185 | len = iov[0].iov_len; | |
3186 | if (len < 0) | |
3187 | return -EINVAL; | |
51aac424 | 3188 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3189 | if (IS_ERR(buf)) |
3190 | return PTR_ERR(buf); | |
3191 | iov[0].iov_base = buf; | |
3192 | iov[0].iov_len = len; | |
3193 | return 0; | |
3194 | } | |
3195 | ||
3196 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3197 | unsigned int issue_flags) |
4d954c25 | 3198 | { |
dddb3e26 | 3199 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 | 3200 | struct io_buffer *kbuf = req->kbuf; |
dddb3e26 | 3201 | |
dddb3e26 JA |
3202 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
3203 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3204 | return 0; |
dddb3e26 | 3205 | } |
dd201662 | 3206 | if (req->rw.len != 1) |
4d954c25 JA |
3207 | return -EINVAL; |
3208 | ||
3209 | #ifdef CONFIG_COMPAT | |
3210 | if (req->ctx->compat) | |
51aac424 | 3211 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
3212 | #endif |
3213 | ||
51aac424 | 3214 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
3215 | } |
3216 | ||
caa8fe6e PB |
3217 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
3218 | struct io_rw_state *s, | |
3219 | unsigned int issue_flags) | |
2b188cc1 | 3220 | { |
5e49c973 | 3221 | struct iov_iter *iter = &s->iter; |
847595de | 3222 | u8 opcode = req->opcode; |
caa8fe6e | 3223 | struct iovec *iovec; |
d1d681b0 PB |
3224 | void __user *buf; |
3225 | size_t sqe_len; | |
4d954c25 | 3226 | ssize_t ret; |
edafccee | 3227 | |
caa8fe6e PB |
3228 | BUILD_BUG_ON(ERR_PTR(0) != NULL); |
3229 | ||
3230 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) | |
3231 | return ERR_PTR(io_import_fixed(req, rw, iter)); | |
2b188cc1 | 3232 | |
bcda7baa | 3233 | /* buffer index only valid with fixed read/write, or buffer select */ |
d1d681b0 | 3234 | if (unlikely(req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))) |
caa8fe6e | 3235 | return ERR_PTR(-EINVAL); |
9adbd45d | 3236 | |
d1d681b0 PB |
3237 | buf = u64_to_user_ptr(req->rw.addr); |
3238 | sqe_len = req->rw.len; | |
9adbd45d | 3239 | |
3a6820f2 | 3240 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3241 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 3242 | buf = io_rw_buffer_select(req, &sqe_len, issue_flags); |
867a23ea | 3243 | if (IS_ERR(buf)) |
898df244 | 3244 | return ERR_CAST(buf); |
3f9d6441 | 3245 | req->rw.len = sqe_len; |
bcda7baa JA |
3246 | } |
3247 | ||
5e49c973 | 3248 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
caa8fe6e | 3249 | return ERR_PTR(ret); |
3a6820f2 JA |
3250 | } |
3251 | ||
caa8fe6e | 3252 | iovec = s->fast_iov; |
4d954c25 | 3253 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 3254 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
847595de | 3255 | if (!ret) |
caa8fe6e PB |
3256 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); |
3257 | return ERR_PTR(ret); | |
4d954c25 JA |
3258 | } |
3259 | ||
caa8fe6e | 3260 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 3261 | req->ctx->compat); |
caa8fe6e PB |
3262 | if (unlikely(ret < 0)) |
3263 | return ERR_PTR(ret); | |
3264 | return iovec; | |
2b188cc1 JA |
3265 | } |
3266 | ||
5e49c973 PB |
3267 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
3268 | struct iovec **iovec, struct io_rw_state *s, | |
3269 | unsigned int issue_flags) | |
3270 | { | |
caa8fe6e PB |
3271 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
3272 | if (unlikely(IS_ERR(*iovec))) | |
3273 | return PTR_ERR(*iovec); | |
5e49c973 | 3274 | |
5e49c973 | 3275 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 3276 | return 0; |
2b188cc1 JA |
3277 | } |
3278 | ||
0fef9483 JA |
3279 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3280 | { | |
5b09e37e | 3281 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3282 | } |
3283 | ||
31b51510 | 3284 | /* |
32960613 JA |
3285 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3286 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3287 | */ |
4017eb91 | 3288 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3289 | { |
4017eb91 JA |
3290 | struct kiocb *kiocb = &req->rw.kiocb; |
3291 | struct file *file = req->file; | |
32960613 JA |
3292 | ssize_t ret = 0; |
3293 | ||
3294 | /* | |
3295 | * Don't support polled IO through this interface, and we can't | |
3296 | * support non-blocking either. For the latter, this just causes | |
3297 | * the kiocb to be handled from an async context. | |
3298 | */ | |
3299 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3300 | return -EOPNOTSUPP; | |
35645ac3 PB |
3301 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
3302 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
3303 | return -EAGAIN; |
3304 | ||
3305 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3306 | struct iovec iovec; |
32960613 JA |
3307 | ssize_t nr; |
3308 | ||
311ae9e1 PB |
3309 | if (!iov_iter_is_bvec(iter)) { |
3310 | iovec = iov_iter_iovec(iter); | |
3311 | } else { | |
4017eb91 JA |
3312 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3313 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3314 | } |
3315 | ||
32960613 JA |
3316 | if (rw == READ) { |
3317 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3318 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3319 | } else { |
3320 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3321 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3322 | } |
3323 | ||
3324 | if (nr < 0) { | |
3325 | if (!ret) | |
3326 | ret = nr; | |
3327 | break; | |
3328 | } | |
16c8d2df JA |
3329 | if (!iov_iter_is_bvec(iter)) { |
3330 | iov_iter_advance(iter, nr); | |
3331 | } else { | |
3332 | req->rw.len -= nr; | |
3333 | req->rw.addr += nr; | |
3334 | } | |
32960613 JA |
3335 | ret += nr; |
3336 | if (nr != iovec.iov_len) | |
3337 | break; | |
32960613 JA |
3338 | } |
3339 | ||
3340 | return ret; | |
3341 | } | |
3342 | ||
ff6165b2 JA |
3343 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3344 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3345 | { |
e8c2bc1f | 3346 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3347 | |
538941e2 | 3348 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 3349 | rw->free_iovec = iovec; |
227c0c96 | 3350 | rw->bytes_done = 0; |
ff6165b2 | 3351 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3352 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3353 | return; |
b64e3444 | 3354 | if (!iovec) { |
ff6165b2 JA |
3355 | unsigned iov_off = 0; |
3356 | ||
538941e2 | 3357 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
3358 | if (iter->iov != fast_iov) { |
3359 | iov_off = iter->iov - fast_iov; | |
538941e2 | 3360 | rw->s.iter.iov += iov_off; |
ff6165b2 | 3361 | } |
538941e2 PB |
3362 | if (rw->s.fast_iov != fast_iov) |
3363 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3364 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3365 | } else { |
3366 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3367 | } |
3368 | } | |
3369 | ||
8d4af685 | 3370 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3371 | { |
e8c2bc1f JA |
3372 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3373 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
3374 | if (req->async_data) { |
3375 | req->flags |= REQ_F_ASYNC_DATA; | |
3376 | return false; | |
3377 | } | |
3378 | return true; | |
3d9932a8 XW |
3379 | } |
3380 | ||
ff6165b2 | 3381 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 3382 | struct io_rw_state *s, bool force) |
b7bb4f7d | 3383 | { |
26f0505a | 3384 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3385 | return 0; |
d886e185 | 3386 | if (!req_has_async_data(req)) { |
cd658695 JA |
3387 | struct io_async_rw *iorw; |
3388 | ||
6cb78689 | 3389 | if (io_alloc_async_data(req)) { |
6bf985dc | 3390 | kfree(iovec); |
5d204bcf | 3391 | return -ENOMEM; |
6bf985dc | 3392 | } |
b7bb4f7d | 3393 | |
c88598a9 | 3394 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
3395 | iorw = req->async_data; |
3396 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 3397 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 3398 | } |
b7bb4f7d | 3399 | return 0; |
f67676d1 JA |
3400 | } |
3401 | ||
73debe68 | 3402 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3403 | { |
e8c2bc1f | 3404 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 3405 | struct iovec *iov; |
847595de | 3406 | int ret; |
c3e330a4 | 3407 | |
51aac424 | 3408 | /* submission path, ->uring_lock should already be taken */ |
3b44b371 | 3409 | ret = io_import_iovec(rw, req, &iov, &iorw->s, 0); |
c3e330a4 PB |
3410 | if (unlikely(ret < 0)) |
3411 | return ret; | |
3412 | ||
ab0b196c PB |
3413 | iorw->bytes_done = 0; |
3414 | iorw->free_iovec = iov; | |
3415 | if (iov) | |
3416 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3417 | return 0; |
3418 | } | |
3419 | ||
73debe68 | 3420 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3421 | { |
3529d8c2 JA |
3422 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3423 | return -EBADF; | |
b9a6b8f9 | 3424 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3425 | } |
3426 | ||
c1dd91d1 | 3427 | /* |
ffdc8dab | 3428 | * This is our waitqueue callback handler, registered through __folio_lock_async() |
c1dd91d1 JA |
3429 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
3430 | * This gets called when the page is unlocked, and we generally expect that to | |
3431 | * happen when the page IO is completed and the page is now uptodate. This will | |
3432 | * queue a task_work based retry of the operation, attempting to copy the data | |
3433 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3434 | * do a thread based blocking retry of the operation. That's the unexpected | |
3435 | * slow path. | |
3436 | */ | |
bcf5a063 JA |
3437 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3438 | int sync, void *arg) | |
3439 | { | |
3440 | struct wait_page_queue *wpq; | |
3441 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3442 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3443 | |
3444 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3445 | ||
cdc8fcb4 LT |
3446 | if (!wake_page_match(wpq, key)) |
3447 | return 0; | |
3448 | ||
c8d317aa | 3449 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3450 | list_del_init(&wait->entry); |
921b9054 | 3451 | io_req_task_queue(req); |
bcf5a063 JA |
3452 | return 1; |
3453 | } | |
3454 | ||
c1dd91d1 JA |
3455 | /* |
3456 | * This controls whether a given IO request should be armed for async page | |
3457 | * based retry. If we return false here, the request is handed to the async | |
3458 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3459 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3460 | * will either succeed because the page is now uptodate and unlocked, or it | |
3461 | * will register a callback when the page is unlocked at IO completion. Through | |
3462 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3463 | * That retry will attempt the buffered read again. The retry will generally | |
3464 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3465 | * async worker threads for a blocking retry. | |
3466 | */ | |
227c0c96 | 3467 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3468 | { |
e8c2bc1f JA |
3469 | struct io_async_rw *rw = req->async_data; |
3470 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3471 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3472 | |
bcf5a063 JA |
3473 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3474 | if (req->flags & REQ_F_NOWAIT) | |
3475 | return false; | |
f67676d1 | 3476 | |
227c0c96 | 3477 | /* Only for buffered IO */ |
3b2a4439 | 3478 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3479 | return false; |
3b2a4439 | 3480 | |
bcf5a063 JA |
3481 | /* |
3482 | * just use poll if we can, and don't attempt if the fs doesn't | |
3483 | * support callback based unlocks | |
3484 | */ | |
3485 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3486 | return false; | |
f67676d1 | 3487 | |
3b2a4439 JA |
3488 | wait->wait.func = io_async_buf_func; |
3489 | wait->wait.private = req; | |
3490 | wait->wait.flags = 0; | |
3491 | INIT_LIST_HEAD(&wait->wait.entry); | |
3492 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3493 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3494 | kiocb->ki_waitq = wait; |
3b2a4439 | 3495 | return true; |
bcf5a063 JA |
3496 | } |
3497 | ||
aeab9506 | 3498 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 3499 | { |
607b6fb8 | 3500 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 3501 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 3502 | else if (req->file->f_op->read) |
4017eb91 | 3503 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3504 | else |
3505 | return -EINVAL; | |
f67676d1 JA |
3506 | } |
3507 | ||
7db30437 ML |
3508 | static bool need_read_all(struct io_kiocb *req) |
3509 | { | |
3510 | return req->flags & REQ_F_ISREG || | |
3511 | S_ISBLK(file_inode(req->file)->i_mode); | |
3512 | } | |
3513 | ||
889fca73 | 3514 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3515 | { |
607b6fb8 | 3516 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3517 | struct iovec *iovec; |
9adbd45d | 3518 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3519 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 3520 | struct io_async_rw *rw; |
cd658695 | 3521 | ssize_t ret, ret2; |
ff6165b2 | 3522 | |
607b6fb8 PB |
3523 | if (!req_has_async_data(req)) { |
3524 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3525 | if (unlikely(ret < 0)) | |
3526 | return ret; | |
3527 | } else { | |
d886e185 | 3528 | rw = req->async_data; |
c88598a9 | 3529 | s = &rw->s; |
cd658695 JA |
3530 | /* |
3531 | * We come here from an earlier attempt, restore our state to | |
3532 | * match in case it doesn't. It's cheap enough that we don't | |
3533 | * need to make this conditional. | |
3534 | */ | |
c88598a9 | 3535 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 3536 | iovec = NULL; |
2846c481 | 3537 | } |
c88598a9 | 3538 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3539 | |
607b6fb8 PB |
3540 | if (force_nonblock) { |
3541 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3542 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
3543 | ret = io_setup_async_rw(req, iovec, s, true); |
3544 | return ret ?: -EAGAIN; | |
3545 | } | |
a88fc400 | 3546 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
3547 | } else { |
3548 | /* Ensure we clear previously set non-block flag */ | |
3549 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 3550 | } |
9e645e11 | 3551 | |
cd658695 | 3552 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); |
5ea5dd45 PB |
3553 | if (unlikely(ret)) { |
3554 | kfree(iovec); | |
3555 | return ret; | |
3556 | } | |
2b188cc1 | 3557 | |
c88598a9 | 3558 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 3559 | |
230d50d4 | 3560 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3561 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3562 | /* IOPOLL retry should happen for io-wq threads */ |
3563 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3564 | goto done; |
75c668cd PB |
3565 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3566 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3567 | goto done; |
f38c7e3a | 3568 | ret = 0; |
230d50d4 JA |
3569 | } else if (ret == -EIOCBQUEUED) { |
3570 | goto out_free; | |
f80a50a6 | 3571 | } else if (ret == req->result || ret <= 0 || !force_nonblock || |
7db30437 | 3572 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3573 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3574 | goto done; |
227c0c96 JA |
3575 | } |
3576 | ||
cd658695 JA |
3577 | /* |
3578 | * Don't depend on the iter state matching what was consumed, or being | |
3579 | * untouched in case of error. Restore it and we'll advance it | |
3580 | * manually if we need to. | |
3581 | */ | |
c88598a9 | 3582 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3583 | |
c88598a9 | 3584 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
3585 | if (ret2) |
3586 | return ret2; | |
3587 | ||
fe1cdd55 | 3588 | iovec = NULL; |
e8c2bc1f | 3589 | rw = req->async_data; |
c88598a9 | 3590 | s = &rw->s; |
cd658695 JA |
3591 | /* |
3592 | * Now use our persistent iterator and state, if we aren't already. | |
3593 | * We've restored and mapped the iter to match. | |
3594 | */ | |
227c0c96 | 3595 | |
b23df91b | 3596 | do { |
cd658695 JA |
3597 | /* |
3598 | * We end up here because of a partial read, either from | |
3599 | * above or inside this loop. Advance the iter by the bytes | |
3600 | * that were consumed. | |
3601 | */ | |
c88598a9 PB |
3602 | iov_iter_advance(&s->iter, ret); |
3603 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 3604 | break; |
b23df91b | 3605 | rw->bytes_done += ret; |
c88598a9 | 3606 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 3607 | |
b23df91b PB |
3608 | /* if we can retry, do so with the callbacks armed */ |
3609 | if (!io_rw_should_retry(req)) { | |
3610 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3611 | return -EAGAIN; | |
3612 | } | |
3613 | ||
3614 | /* | |
3615 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3616 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3617 | * desired page gets unlocked. We can also get a partial read | |
3618 | * here, and if we do, then just retry at the new offset. | |
3619 | */ | |
c88598a9 | 3620 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
3621 | if (ret == -EIOCBQUEUED) |
3622 | return 0; | |
227c0c96 | 3623 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3624 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 3625 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3626 | } while (ret > 0); |
227c0c96 | 3627 | done: |
889fca73 | 3628 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3629 | out_free: |
3630 | /* it's faster to check here then delegate to kfree */ | |
3631 | if (iovec) | |
3632 | kfree(iovec); | |
5ea5dd45 | 3633 | return 0; |
2b188cc1 JA |
3634 | } |
3635 | ||
73debe68 | 3636 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3637 | { |
3529d8c2 JA |
3638 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3639 | return -EBADF; | |
3884b83d | 3640 | req->rw.kiocb.ki_hint = ki_hint_validate(file_write_hint(req->file)); |
b9a6b8f9 | 3641 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3642 | } |
3643 | ||
889fca73 | 3644 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3645 | { |
607b6fb8 | 3646 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3647 | struct iovec *iovec; |
9adbd45d | 3648 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3649 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3650 | ssize_t ret, ret2; |
2b188cc1 | 3651 | |
607b6fb8 | 3652 | if (!req_has_async_data(req)) { |
5e49c973 PB |
3653 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
3654 | if (unlikely(ret < 0)) | |
2846c481 | 3655 | return ret; |
607b6fb8 PB |
3656 | } else { |
3657 | struct io_async_rw *rw = req->async_data; | |
3658 | ||
3659 | s = &rw->s; | |
3660 | iov_iter_restore(&s->iter, &s->iter_state); | |
2846c481 | 3661 | iovec = NULL; |
2846c481 | 3662 | } |
c88598a9 | 3663 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3664 | |
607b6fb8 PB |
3665 | if (force_nonblock) { |
3666 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3667 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 3668 | goto copy_iov; |
fd6c2e4c | 3669 | |
607b6fb8 PB |
3670 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3671 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3672 | (req->flags & REQ_F_ISREG)) | |
3673 | goto copy_iov; | |
31b51510 | 3674 | |
607b6fb8 PB |
3675 | kiocb->ki_flags |= IOCB_NOWAIT; |
3676 | } else { | |
3677 | /* Ensure we clear previously set non-block flag */ | |
3678 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
3679 | } | |
31b51510 | 3680 | |
cd658695 | 3681 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); |
fa15bafb PB |
3682 | if (unlikely(ret)) |
3683 | goto out_free; | |
4ed734b0 | 3684 | |
fa15bafb PB |
3685 | /* |
3686 | * Open-code file_start_write here to grab freeze protection, | |
3687 | * which will be released by another thread in | |
3688 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3689 | * released so that it doesn't complain about the held lock when | |
3690 | * we return to userspace. | |
3691 | */ | |
3692 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3693 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3694 | __sb_writers_release(file_inode(req->file)->i_sb, |
3695 | SB_FREEZE_WRITE); | |
3696 | } | |
3697 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3698 | |
35645ac3 | 3699 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 3700 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 3701 | else if (req->file->f_op->write) |
c88598a9 | 3702 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
3703 | else |
3704 | ret2 = -EINVAL; | |
4ed734b0 | 3705 | |
6ad7f233 PB |
3706 | if (req->flags & REQ_F_REISSUE) { |
3707 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3708 | ret2 = -EAGAIN; |
6ad7f233 | 3709 | } |
230d50d4 | 3710 | |
fa15bafb PB |
3711 | /* |
3712 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3713 | * retry them without IOCB_NOWAIT. | |
3714 | */ | |
3715 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3716 | ret2 = -EAGAIN; | |
75c668cd PB |
3717 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3718 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3719 | goto done; |
fa15bafb | 3720 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 3721 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 3722 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 3723 | goto copy_iov; |
355afaeb | 3724 | done: |
889fca73 | 3725 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3726 | } else { |
f67676d1 | 3727 | copy_iov: |
c88598a9 PB |
3728 | iov_iter_restore(&s->iter, &s->iter_state); |
3729 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 3730 | return ret ?: -EAGAIN; |
2b188cc1 | 3731 | } |
31b51510 | 3732 | out_free: |
f261c168 | 3733 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3734 | if (iovec) |
6f2cc166 | 3735 | kfree(iovec); |
2b188cc1 JA |
3736 | return ret; |
3737 | } | |
3738 | ||
80a261fd JA |
3739 | static int io_renameat_prep(struct io_kiocb *req, |
3740 | const struct io_uring_sqe *sqe) | |
3741 | { | |
3742 | struct io_rename *ren = &req->rename; | |
3743 | const char __user *oldf, *newf; | |
3744 | ||
ed7eb259 JA |
3745 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3746 | return -EINVAL; | |
26578cda | 3747 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3748 | return -EINVAL; |
80a261fd JA |
3749 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3750 | return -EBADF; | |
3751 | ||
3752 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3753 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3754 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3755 | ren->new_dfd = READ_ONCE(sqe->len); | |
3756 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3757 | ||
3758 | ren->oldpath = getname(oldf); | |
3759 | if (IS_ERR(ren->oldpath)) | |
3760 | return PTR_ERR(ren->oldpath); | |
3761 | ||
3762 | ren->newpath = getname(newf); | |
3763 | if (IS_ERR(ren->newpath)) { | |
3764 | putname(ren->oldpath); | |
3765 | return PTR_ERR(ren->newpath); | |
3766 | } | |
3767 | ||
3768 | req->flags |= REQ_F_NEED_CLEANUP; | |
3769 | return 0; | |
3770 | } | |
3771 | ||
45d189c6 | 3772 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3773 | { |
3774 | struct io_rename *ren = &req->rename; | |
3775 | int ret; | |
3776 | ||
45d189c6 | 3777 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3778 | return -EAGAIN; |
3779 | ||
3780 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3781 | ren->newpath, ren->flags); | |
3782 | ||
3783 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3784 | if (ret < 0) | |
93d2bcd2 | 3785 | req_set_fail(req); |
80a261fd JA |
3786 | io_req_complete(req, ret); |
3787 | return 0; | |
3788 | } | |
3789 | ||
14a1143b JA |
3790 | static int io_unlinkat_prep(struct io_kiocb *req, |
3791 | const struct io_uring_sqe *sqe) | |
3792 | { | |
3793 | struct io_unlink *un = &req->unlink; | |
3794 | const char __user *fname; | |
3795 | ||
22634bc5 JA |
3796 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3797 | return -EINVAL; | |
26578cda PB |
3798 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3799 | sqe->splice_fd_in) | |
22634bc5 | 3800 | return -EINVAL; |
14a1143b JA |
3801 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3802 | return -EBADF; | |
3803 | ||
3804 | un->dfd = READ_ONCE(sqe->fd); | |
3805 | ||
3806 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3807 | if (un->flags & ~AT_REMOVEDIR) | |
3808 | return -EINVAL; | |
3809 | ||
3810 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3811 | un->filename = getname(fname); | |
3812 | if (IS_ERR(un->filename)) | |
3813 | return PTR_ERR(un->filename); | |
3814 | ||
3815 | req->flags |= REQ_F_NEED_CLEANUP; | |
3816 | return 0; | |
3817 | } | |
3818 | ||
45d189c6 | 3819 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3820 | { |
3821 | struct io_unlink *un = &req->unlink; | |
3822 | int ret; | |
3823 | ||
45d189c6 | 3824 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3825 | return -EAGAIN; |
3826 | ||
3827 | if (un->flags & AT_REMOVEDIR) | |
3828 | ret = do_rmdir(un->dfd, un->filename); | |
3829 | else | |
3830 | ret = do_unlinkat(un->dfd, un->filename); | |
3831 | ||
3832 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3833 | if (ret < 0) | |
93d2bcd2 | 3834 | req_set_fail(req); |
14a1143b JA |
3835 | io_req_complete(req, ret); |
3836 | return 0; | |
3837 | } | |
3838 | ||
e34a02dc DK |
3839 | static int io_mkdirat_prep(struct io_kiocb *req, |
3840 | const struct io_uring_sqe *sqe) | |
3841 | { | |
3842 | struct io_mkdir *mkd = &req->mkdir; | |
3843 | const char __user *fname; | |
3844 | ||
3845 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3846 | return -EINVAL; | |
3847 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
3848 | sqe->splice_fd_in) | |
3849 | return -EINVAL; | |
3850 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3851 | return -EBADF; | |
3852 | ||
3853 | mkd->dfd = READ_ONCE(sqe->fd); | |
3854 | mkd->mode = READ_ONCE(sqe->len); | |
3855 | ||
3856 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3857 | mkd->filename = getname(fname); | |
3858 | if (IS_ERR(mkd->filename)) | |
3859 | return PTR_ERR(mkd->filename); | |
3860 | ||
3861 | req->flags |= REQ_F_NEED_CLEANUP; | |
3862 | return 0; | |
3863 | } | |
3864 | ||
04f34081 | 3865 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
3866 | { |
3867 | struct io_mkdir *mkd = &req->mkdir; | |
3868 | int ret; | |
3869 | ||
3870 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3871 | return -EAGAIN; | |
3872 | ||
3873 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
3874 | ||
3875 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3876 | if (ret < 0) | |
3877 | req_set_fail(req); | |
3878 | io_req_complete(req, ret); | |
3879 | return 0; | |
3880 | } | |
3881 | ||
7a8721f8 DK |
3882 | static int io_symlinkat_prep(struct io_kiocb *req, |
3883 | const struct io_uring_sqe *sqe) | |
3884 | { | |
3885 | struct io_symlink *sl = &req->symlink; | |
3886 | const char __user *oldpath, *newpath; | |
3887 | ||
3888 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3889 | return -EINVAL; | |
3890 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
3891 | sqe->splice_fd_in) | |
3892 | return -EINVAL; | |
3893 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3894 | return -EBADF; | |
3895 | ||
3896 | sl->new_dfd = READ_ONCE(sqe->fd); | |
3897 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3898 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3899 | ||
3900 | sl->oldpath = getname(oldpath); | |
3901 | if (IS_ERR(sl->oldpath)) | |
3902 | return PTR_ERR(sl->oldpath); | |
3903 | ||
3904 | sl->newpath = getname(newpath); | |
3905 | if (IS_ERR(sl->newpath)) { | |
3906 | putname(sl->oldpath); | |
3907 | return PTR_ERR(sl->newpath); | |
3908 | } | |
3909 | ||
3910 | req->flags |= REQ_F_NEED_CLEANUP; | |
3911 | return 0; | |
3912 | } | |
3913 | ||
04f34081 | 3914 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
3915 | { |
3916 | struct io_symlink *sl = &req->symlink; | |
3917 | int ret; | |
3918 | ||
3919 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3920 | return -EAGAIN; | |
3921 | ||
3922 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
3923 | ||
3924 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3925 | if (ret < 0) | |
3926 | req_set_fail(req); | |
3927 | io_req_complete(req, ret); | |
3928 | return 0; | |
3929 | } | |
3930 | ||
cf30da90 DK |
3931 | static int io_linkat_prep(struct io_kiocb *req, |
3932 | const struct io_uring_sqe *sqe) | |
3933 | { | |
3934 | struct io_hardlink *lnk = &req->hardlink; | |
3935 | const char __user *oldf, *newf; | |
3936 | ||
3937 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3938 | return -EINVAL; | |
3939 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
3940 | return -EINVAL; | |
3941 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3942 | return -EBADF; | |
3943 | ||
3944 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
3945 | lnk->new_dfd = READ_ONCE(sqe->len); | |
3946 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3947 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3948 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
3949 | ||
3950 | lnk->oldpath = getname(oldf); | |
3951 | if (IS_ERR(lnk->oldpath)) | |
3952 | return PTR_ERR(lnk->oldpath); | |
3953 | ||
3954 | lnk->newpath = getname(newf); | |
3955 | if (IS_ERR(lnk->newpath)) { | |
3956 | putname(lnk->oldpath); | |
3957 | return PTR_ERR(lnk->newpath); | |
3958 | } | |
3959 | ||
3960 | req->flags |= REQ_F_NEED_CLEANUP; | |
3961 | return 0; | |
3962 | } | |
3963 | ||
04f34081 | 3964 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
3965 | { |
3966 | struct io_hardlink *lnk = &req->hardlink; | |
3967 | int ret; | |
3968 | ||
3969 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3970 | return -EAGAIN; | |
3971 | ||
3972 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
3973 | lnk->newpath, lnk->flags); | |
3974 | ||
3975 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3976 | if (ret < 0) | |
3977 | req_set_fail(req); | |
3978 | io_req_complete(req, ret); | |
3979 | return 0; | |
3980 | } | |
3981 | ||
36f4fa68 JA |
3982 | static int io_shutdown_prep(struct io_kiocb *req, |
3983 | const struct io_uring_sqe *sqe) | |
3984 | { | |
3985 | #if defined(CONFIG_NET) | |
3986 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3987 | return -EINVAL; | |
26578cda PB |
3988 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
3989 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
3990 | return -EINVAL; |
3991 | ||
3992 | req->shutdown.how = READ_ONCE(sqe->len); | |
3993 | return 0; | |
3994 | #else | |
3995 | return -EOPNOTSUPP; | |
3996 | #endif | |
3997 | } | |
3998 | ||
45d189c6 | 3999 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
4000 | { |
4001 | #if defined(CONFIG_NET) | |
4002 | struct socket *sock; | |
4003 | int ret; | |
4004 | ||
45d189c6 | 4005 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
4006 | return -EAGAIN; |
4007 | ||
48aba79b | 4008 | sock = sock_from_file(req->file); |
36f4fa68 | 4009 | if (unlikely(!sock)) |
48aba79b | 4010 | return -ENOTSOCK; |
36f4fa68 JA |
4011 | |
4012 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 4013 | if (ret < 0) |
93d2bcd2 | 4014 | req_set_fail(req); |
36f4fa68 JA |
4015 | io_req_complete(req, ret); |
4016 | return 0; | |
4017 | #else | |
4018 | return -EOPNOTSUPP; | |
4019 | #endif | |
4020 | } | |
4021 | ||
f2a8d5c7 PB |
4022 | static int __io_splice_prep(struct io_kiocb *req, |
4023 | const struct io_uring_sqe *sqe) | |
7d67af2c | 4024 | { |
fe7e3257 | 4025 | struct io_splice *sp = &req->splice; |
7d67af2c | 4026 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 4027 | |
3232dd02 PB |
4028 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4029 | return -EINVAL; | |
7d67af2c PB |
4030 | |
4031 | sp->file_in = NULL; | |
7d67af2c PB |
4032 | sp->len = READ_ONCE(sqe->len); |
4033 | sp->flags = READ_ONCE(sqe->splice_flags); | |
4034 | ||
4035 | if (unlikely(sp->flags & ~valid_flags)) | |
4036 | return -EINVAL; | |
4037 | ||
62906e89 | 4038 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
4039 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
4040 | if (!sp->file_in) | |
4041 | return -EBADF; | |
7d67af2c | 4042 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
4043 | return 0; |
4044 | } | |
4045 | ||
f2a8d5c7 PB |
4046 | static int io_tee_prep(struct io_kiocb *req, |
4047 | const struct io_uring_sqe *sqe) | |
4048 | { | |
4049 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
4050 | return -EINVAL; | |
4051 | return __io_splice_prep(req, sqe); | |
4052 | } | |
4053 | ||
45d189c6 | 4054 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
4055 | { |
4056 | struct io_splice *sp = &req->splice; | |
4057 | struct file *in = sp->file_in; | |
4058 | struct file *out = sp->file_out; | |
4059 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4060 | long ret = 0; | |
4061 | ||
45d189c6 | 4062 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
4063 | return -EAGAIN; |
4064 | if (sp->len) | |
4065 | ret = do_tee(in, out, sp->len, flags); | |
4066 | ||
e1d767f0 PB |
4067 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4068 | io_put_file(in); | |
f2a8d5c7 PB |
4069 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4070 | ||
f2a8d5c7 | 4071 | if (ret != sp->len) |
93d2bcd2 | 4072 | req_set_fail(req); |
e1e16097 | 4073 | io_req_complete(req, ret); |
f2a8d5c7 PB |
4074 | return 0; |
4075 | } | |
4076 | ||
4077 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4078 | { | |
fe7e3257 | 4079 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
4080 | |
4081 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4082 | sp->off_out = READ_ONCE(sqe->off); | |
4083 | return __io_splice_prep(req, sqe); | |
4084 | } | |
4085 | ||
45d189c6 | 4086 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4087 | { |
4088 | struct io_splice *sp = &req->splice; | |
4089 | struct file *in = sp->file_in; | |
4090 | struct file *out = sp->file_out; | |
4091 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4092 | loff_t *poff_in, *poff_out; | |
c9687426 | 4093 | long ret = 0; |
7d67af2c | 4094 | |
45d189c6 | 4095 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4096 | return -EAGAIN; |
7d67af2c PB |
4097 | |
4098 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4099 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4100 | |
948a7749 | 4101 | if (sp->len) |
c9687426 | 4102 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4103 | |
e1d767f0 PB |
4104 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4105 | io_put_file(in); | |
7d67af2c PB |
4106 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4107 | ||
7d67af2c | 4108 | if (ret != sp->len) |
93d2bcd2 | 4109 | req_set_fail(req); |
e1e16097 | 4110 | io_req_complete(req, ret); |
7d67af2c PB |
4111 | return 0; |
4112 | } | |
4113 | ||
2b188cc1 JA |
4114 | /* |
4115 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4116 | */ | |
889fca73 | 4117 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4118 | { |
4119 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4120 | |
def596e9 JA |
4121 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4122 | return -EINVAL; | |
4123 | ||
889fca73 | 4124 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4125 | return 0; |
4126 | } | |
4127 | ||
1155c76a | 4128 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4129 | { |
6b06314c | 4130 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4131 | |
09bb8394 JA |
4132 | if (!req->file) |
4133 | return -EBADF; | |
c992fe29 | 4134 | |
6b06314c | 4135 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4136 | return -EINVAL; |
26578cda PB |
4137 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4138 | sqe->splice_fd_in)) | |
c992fe29 CH |
4139 | return -EINVAL; |
4140 | ||
8ed8d3c3 JA |
4141 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4142 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4143 | return -EINVAL; | |
4144 | ||
4145 | req->sync.off = READ_ONCE(sqe->off); | |
4146 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4147 | return 0; |
4148 | } | |
4149 | ||
45d189c6 | 4150 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4151 | { |
8ed8d3c3 | 4152 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4153 | int ret; |
4154 | ||
ac45abc0 | 4155 | /* fsync always requires a blocking context */ |
45d189c6 | 4156 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4157 | return -EAGAIN; |
4158 | ||
9adbd45d | 4159 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4160 | end > 0 ? end : LLONG_MAX, |
4161 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4162 | if (ret < 0) | |
93d2bcd2 | 4163 | req_set_fail(req); |
e1e16097 | 4164 | io_req_complete(req, ret); |
c992fe29 CH |
4165 | return 0; |
4166 | } | |
4167 | ||
d63d1b5e JA |
4168 | static int io_fallocate_prep(struct io_kiocb *req, |
4169 | const struct io_uring_sqe *sqe) | |
4170 | { | |
26578cda PB |
4171 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4172 | sqe->splice_fd_in) | |
d63d1b5e | 4173 | return -EINVAL; |
3232dd02 PB |
4174 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4175 | return -EINVAL; | |
d63d1b5e JA |
4176 | |
4177 | req->sync.off = READ_ONCE(sqe->off); | |
4178 | req->sync.len = READ_ONCE(sqe->addr); | |
4179 | req->sync.mode = READ_ONCE(sqe->len); | |
4180 | return 0; | |
4181 | } | |
4182 | ||
45d189c6 | 4183 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4184 | { |
ac45abc0 PB |
4185 | int ret; |
4186 | ||
d63d1b5e | 4187 | /* fallocate always requiring blocking context */ |
45d189c6 | 4188 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4189 | return -EAGAIN; |
ac45abc0 PB |
4190 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4191 | req->sync.len); | |
ac45abc0 | 4192 | if (ret < 0) |
93d2bcd2 | 4193 | req_set_fail(req); |
e1e16097 | 4194 | io_req_complete(req, ret); |
5d17b4a4 JA |
4195 | return 0; |
4196 | } | |
4197 | ||
ec65fea5 | 4198 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4199 | { |
f8748881 | 4200 | const char __user *fname; |
15b71abe | 4201 | int ret; |
b7bb4f7d | 4202 | |
d3fddf6d PB |
4203 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4204 | return -EINVAL; | |
b9445598 | 4205 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4206 | return -EINVAL; |
ec65fea5 | 4207 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4208 | return -EBADF; |
03b1230c | 4209 | |
ec65fea5 PB |
4210 | /* open.how should be already initialised */ |
4211 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4212 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4213 | |
25e72d10 PB |
4214 | req->open.dfd = READ_ONCE(sqe->fd); |
4215 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4216 | req->open.filename = getname(fname); |
15b71abe JA |
4217 | if (IS_ERR(req->open.filename)) { |
4218 | ret = PTR_ERR(req->open.filename); | |
4219 | req->open.filename = NULL; | |
4220 | return ret; | |
4221 | } | |
b9445598 PB |
4222 | |
4223 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4224 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4225 | return -EINVAL; | |
4226 | ||
4022e7af | 4227 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4228 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4229 | return 0; |
03b1230c JA |
4230 | } |
4231 | ||
ec65fea5 PB |
4232 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4233 | { | |
d3fddf6d PB |
4234 | u64 mode = READ_ONCE(sqe->len); |
4235 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4236 | |
ec65fea5 PB |
4237 | req->open.how = build_open_how(flags, mode); |
4238 | return __io_openat_prep(req, sqe); | |
4239 | } | |
4240 | ||
cebdb986 | 4241 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4242 | { |
cebdb986 | 4243 | struct open_how __user *how; |
cebdb986 | 4244 | size_t len; |
0fa03c62 JA |
4245 | int ret; |
4246 | ||
cebdb986 JA |
4247 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4248 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4249 | if (len < OPEN_HOW_SIZE_VER0) |
4250 | return -EINVAL; | |
3529d8c2 | 4251 | |
cebdb986 JA |
4252 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4253 | len); | |
4254 | if (ret) | |
4255 | return ret; | |
3529d8c2 | 4256 | |
ec65fea5 | 4257 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4258 | } |
4259 | ||
45d189c6 | 4260 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4261 | { |
4262 | struct open_flags op; | |
15b71abe | 4263 | struct file *file; |
b9445598 PB |
4264 | bool resolve_nonblock, nonblock_set; |
4265 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4266 | int ret; |
4267 | ||
cebdb986 | 4268 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4269 | if (ret) |
4270 | goto err; | |
3a81fd02 JA |
4271 | nonblock_set = op.open_flag & O_NONBLOCK; |
4272 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4273 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4274 | /* |
4275 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4276 | * it'll always -EAGAIN | |
4277 | */ | |
4278 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4279 | return -EAGAIN; | |
4280 | op.lookup_flags |= LOOKUP_CACHED; | |
4281 | op.open_flag |= O_NONBLOCK; | |
4282 | } | |
15b71abe | 4283 | |
b9445598 PB |
4284 | if (!fixed) { |
4285 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4286 | if (ret < 0) | |
4287 | goto err; | |
4288 | } | |
15b71abe JA |
4289 | |
4290 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4291 | if (IS_ERR(file)) { |
944d1444 | 4292 | /* |
12dcb58a PB |
4293 | * We could hang on to this 'fd' on retrying, but seems like |
4294 | * marginal gain for something that is now known to be a slower | |
4295 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4296 | */ |
b9445598 PB |
4297 | if (!fixed) |
4298 | put_unused_fd(ret); | |
3a81fd02 | 4299 | |
15b71abe | 4300 | ret = PTR_ERR(file); |
12dcb58a PB |
4301 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4302 | if (ret == -EAGAIN && | |
4303 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4304 | return -EAGAIN; | |
4305 | goto err; | |
15b71abe | 4306 | } |
12dcb58a PB |
4307 | |
4308 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4309 | file->f_flags &= ~O_NONBLOCK; | |
4310 | fsnotify_open(file); | |
b9445598 PB |
4311 | |
4312 | if (!fixed) | |
4313 | fd_install(ret, file); | |
4314 | else | |
4315 | ret = io_install_fixed_file(req, file, issue_flags, | |
4316 | req->open.file_slot - 1); | |
15b71abe JA |
4317 | err: |
4318 | putname(req->open.filename); | |
8fef80bf | 4319 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4320 | if (ret < 0) |
93d2bcd2 | 4321 | req_set_fail(req); |
0bdf3398 | 4322 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4323 | return 0; |
4324 | } | |
4325 | ||
45d189c6 | 4326 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4327 | { |
e45cff58 | 4328 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4329 | } |
4330 | ||
067524e9 JA |
4331 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4332 | const struct io_uring_sqe *sqe) | |
4333 | { | |
4334 | struct io_provide_buf *p = &req->pbuf; | |
4335 | u64 tmp; | |
4336 | ||
26578cda PB |
4337 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4338 | sqe->splice_fd_in) | |
067524e9 JA |
4339 | return -EINVAL; |
4340 | ||
4341 | tmp = READ_ONCE(sqe->fd); | |
4342 | if (!tmp || tmp > USHRT_MAX) | |
4343 | return -EINVAL; | |
4344 | ||
4345 | memset(p, 0, sizeof(*p)); | |
4346 | p->nbufs = tmp; | |
4347 | p->bgid = READ_ONCE(sqe->buf_group); | |
4348 | return 0; | |
4349 | } | |
4350 | ||
4351 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4352 | int bgid, unsigned nbufs) | |
4353 | { | |
4354 | unsigned i = 0; | |
4355 | ||
4356 | /* shouldn't happen */ | |
4357 | if (!nbufs) | |
4358 | return 0; | |
4359 | ||
4360 | /* the head kbuf is the list itself */ | |
4361 | while (!list_empty(&buf->list)) { | |
4362 | struct io_buffer *nxt; | |
4363 | ||
4364 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4365 | list_del(&nxt->list); | |
4366 | kfree(nxt); | |
4367 | if (++i == nbufs) | |
4368 | return i; | |
1d0254e6 | 4369 | cond_resched(); |
067524e9 JA |
4370 | } |
4371 | i++; | |
4372 | kfree(buf); | |
9e15c3a0 | 4373 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4374 | |
4375 | return i; | |
4376 | } | |
4377 | ||
889fca73 | 4378 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4379 | { |
4380 | struct io_provide_buf *p = &req->pbuf; | |
4381 | struct io_ring_ctx *ctx = req->ctx; | |
4382 | struct io_buffer *head; | |
4383 | int ret = 0; | |
3b44b371 | 4384 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
067524e9 | 4385 | |
3b44b371 | 4386 | io_ring_submit_lock(ctx, needs_lock); |
067524e9 JA |
4387 | |
4388 | lockdep_assert_held(&ctx->uring_lock); | |
4389 | ||
4390 | ret = -ENOENT; | |
9e15c3a0 | 4391 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4392 | if (head) |
4393 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4394 | if (ret < 0) |
93d2bcd2 | 4395 | req_set_fail(req); |
067524e9 | 4396 | |
9fb8cb49 PB |
4397 | /* complete before unlock, IOPOLL may need the lock */ |
4398 | __io_req_complete(req, issue_flags, ret, 0); | |
3b44b371 | 4399 | io_ring_submit_unlock(ctx, needs_lock); |
067524e9 JA |
4400 | return 0; |
4401 | } | |
4402 | ||
ddf0322d JA |
4403 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4404 | const struct io_uring_sqe *sqe) | |
4405 | { | |
38134ada | 4406 | unsigned long size, tmp_check; |
ddf0322d JA |
4407 | struct io_provide_buf *p = &req->pbuf; |
4408 | u64 tmp; | |
4409 | ||
26578cda | 4410 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4411 | return -EINVAL; |
4412 | ||
4413 | tmp = READ_ONCE(sqe->fd); | |
4414 | if (!tmp || tmp > USHRT_MAX) | |
4415 | return -E2BIG; | |
4416 | p->nbufs = tmp; | |
4417 | p->addr = READ_ONCE(sqe->addr); | |
4418 | p->len = READ_ONCE(sqe->len); | |
4419 | ||
38134ada PB |
4420 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4421 | &size)) | |
4422 | return -EOVERFLOW; | |
4423 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4424 | return -EOVERFLOW; | |
4425 | ||
d81269fe PB |
4426 | size = (unsigned long)p->len * p->nbufs; |
4427 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4428 | return -EFAULT; |
4429 | ||
4430 | p->bgid = READ_ONCE(sqe->buf_group); | |
4431 | tmp = READ_ONCE(sqe->off); | |
4432 | if (tmp > USHRT_MAX) | |
4433 | return -E2BIG; | |
4434 | p->bid = tmp; | |
4435 | return 0; | |
4436 | } | |
4437 | ||
4438 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4439 | { | |
4440 | struct io_buffer *buf; | |
4441 | u64 addr = pbuf->addr; | |
4442 | int i, bid = pbuf->bid; | |
4443 | ||
4444 | for (i = 0; i < pbuf->nbufs; i++) { | |
9990da93 | 4445 | buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); |
ddf0322d JA |
4446 | if (!buf) |
4447 | break; | |
4448 | ||
4449 | buf->addr = addr; | |
d1f82808 | 4450 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4451 | buf->bid = bid; |
4452 | addr += pbuf->len; | |
4453 | bid++; | |
4454 | if (!*head) { | |
4455 | INIT_LIST_HEAD(&buf->list); | |
4456 | *head = buf; | |
4457 | } else { | |
4458 | list_add_tail(&buf->list, &(*head)->list); | |
4459 | } | |
4460 | } | |
4461 | ||
4462 | return i ? i : -ENOMEM; | |
4463 | } | |
4464 | ||
889fca73 | 4465 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4466 | { |
4467 | struct io_provide_buf *p = &req->pbuf; | |
4468 | struct io_ring_ctx *ctx = req->ctx; | |
4469 | struct io_buffer *head, *list; | |
4470 | int ret = 0; | |
3b44b371 | 4471 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
ddf0322d | 4472 | |
3b44b371 | 4473 | io_ring_submit_lock(ctx, needs_lock); |
ddf0322d JA |
4474 | |
4475 | lockdep_assert_held(&ctx->uring_lock); | |
4476 | ||
9e15c3a0 | 4477 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4478 | |
4479 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4480 | if (ret >= 0 && !list) { |
4481 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4482 | if (ret < 0) | |
067524e9 | 4483 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4484 | } |
ddf0322d | 4485 | if (ret < 0) |
93d2bcd2 | 4486 | req_set_fail(req); |
9fb8cb49 PB |
4487 | /* complete before unlock, IOPOLL may need the lock */ |
4488 | __io_req_complete(req, issue_flags, ret, 0); | |
3b44b371 | 4489 | io_ring_submit_unlock(ctx, needs_lock); |
ddf0322d | 4490 | return 0; |
cebdb986 JA |
4491 | } |
4492 | ||
3e4827b0 JA |
4493 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4494 | const struct io_uring_sqe *sqe) | |
4495 | { | |
4496 | #if defined(CONFIG_EPOLL) | |
26578cda | 4497 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4498 | return -EINVAL; |
2d74d042 | 4499 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4500 | return -EINVAL; |
3e4827b0 JA |
4501 | |
4502 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4503 | req->epoll.op = READ_ONCE(sqe->len); | |
4504 | req->epoll.fd = READ_ONCE(sqe->off); | |
4505 | ||
4506 | if (ep_op_has_event(req->epoll.op)) { | |
4507 | struct epoll_event __user *ev; | |
4508 | ||
4509 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4510 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4511 | return -EFAULT; | |
4512 | } | |
4513 | ||
4514 | return 0; | |
4515 | #else | |
4516 | return -EOPNOTSUPP; | |
4517 | #endif | |
4518 | } | |
4519 | ||
889fca73 | 4520 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4521 | { |
4522 | #if defined(CONFIG_EPOLL) | |
4523 | struct io_epoll *ie = &req->epoll; | |
4524 | int ret; | |
45d189c6 | 4525 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4526 | |
4527 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4528 | if (force_nonblock && ret == -EAGAIN) | |
4529 | return -EAGAIN; | |
4530 | ||
4531 | if (ret < 0) | |
93d2bcd2 | 4532 | req_set_fail(req); |
889fca73 | 4533 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4534 | return 0; |
4535 | #else | |
4536 | return -EOPNOTSUPP; | |
4537 | #endif | |
4538 | } | |
4539 | ||
c1ca757b JA |
4540 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4541 | { | |
4542 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4543 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4544 | return -EINVAL; |
3232dd02 PB |
4545 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4546 | return -EINVAL; | |
c1ca757b JA |
4547 | |
4548 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4549 | req->madvise.len = READ_ONCE(sqe->len); | |
4550 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4551 | return 0; | |
4552 | #else | |
4553 | return -EOPNOTSUPP; | |
4554 | #endif | |
4555 | } | |
4556 | ||
45d189c6 | 4557 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4558 | { |
4559 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4560 | struct io_madvise *ma = &req->madvise; | |
4561 | int ret; | |
4562 | ||
45d189c6 | 4563 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4564 | return -EAGAIN; |
4565 | ||
0726b01e | 4566 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4567 | if (ret < 0) |
93d2bcd2 | 4568 | req_set_fail(req); |
e1e16097 | 4569 | io_req_complete(req, ret); |
c1ca757b JA |
4570 | return 0; |
4571 | #else | |
4572 | return -EOPNOTSUPP; | |
4573 | #endif | |
4574 | } | |
4575 | ||
4840e418 JA |
4576 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4577 | { | |
26578cda | 4578 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4579 | return -EINVAL; |
3232dd02 PB |
4580 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4581 | return -EINVAL; | |
4840e418 JA |
4582 | |
4583 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4584 | req->fadvise.len = READ_ONCE(sqe->len); | |
4585 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4586 | return 0; | |
4587 | } | |
4588 | ||
45d189c6 | 4589 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4590 | { |
4591 | struct io_fadvise *fa = &req->fadvise; | |
4592 | int ret; | |
4593 | ||
45d189c6 | 4594 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4595 | switch (fa->advice) { |
4596 | case POSIX_FADV_NORMAL: | |
4597 | case POSIX_FADV_RANDOM: | |
4598 | case POSIX_FADV_SEQUENTIAL: | |
4599 | break; | |
4600 | default: | |
4601 | return -EAGAIN; | |
4602 | } | |
4603 | } | |
4840e418 JA |
4604 | |
4605 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4606 | if (ret < 0) | |
93d2bcd2 | 4607 | req_set_fail(req); |
0bdf3398 | 4608 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4609 | return 0; |
4610 | } | |
4611 | ||
eddc7ef5 JA |
4612 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4613 | { | |
2d74d042 | 4614 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4615 | return -EINVAL; |
26578cda | 4616 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4617 | return -EINVAL; |
9c280f90 | 4618 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4619 | return -EBADF; |
eddc7ef5 | 4620 | |
1d9e1288 BM |
4621 | req->statx.dfd = READ_ONCE(sqe->fd); |
4622 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4623 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4624 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4625 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4626 | |
4627 | return 0; | |
4628 | } | |
4629 | ||
45d189c6 | 4630 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4631 | { |
1d9e1288 | 4632 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4633 | int ret; |
4634 | ||
59d70013 | 4635 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4636 | return -EAGAIN; |
4637 | ||
e62753e4 BM |
4638 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4639 | ctx->buffer); | |
eddc7ef5 | 4640 | |
eddc7ef5 | 4641 | if (ret < 0) |
93d2bcd2 | 4642 | req_set_fail(req); |
e1e16097 | 4643 | io_req_complete(req, ret); |
eddc7ef5 JA |
4644 | return 0; |
4645 | } | |
4646 | ||
b5dba59e JA |
4647 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4648 | { | |
14587a46 | 4649 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4650 | return -EINVAL; |
b5dba59e | 4651 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 4652 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 4653 | return -EINVAL; |
9c280f90 | 4654 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4655 | return -EBADF; |
b5dba59e JA |
4656 | |
4657 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
4658 | req->close.file_slot = READ_ONCE(sqe->file_index); |
4659 | if (req->close.file_slot && req->close.fd) | |
4660 | return -EINVAL; | |
4661 | ||
b5dba59e | 4662 | return 0; |
b5dba59e JA |
4663 | } |
4664 | ||
889fca73 | 4665 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4666 | { |
9eac1904 | 4667 | struct files_struct *files = current->files; |
3af73b28 | 4668 | struct io_close *close = &req->close; |
9eac1904 | 4669 | struct fdtable *fdt; |
a1fde923 PB |
4670 | struct file *file = NULL; |
4671 | int ret = -EBADF; | |
b5dba59e | 4672 | |
7df778be PB |
4673 | if (req->close.file_slot) { |
4674 | ret = io_close_fixed(req, issue_flags); | |
4675 | goto err; | |
4676 | } | |
4677 | ||
9eac1904 JA |
4678 | spin_lock(&files->file_lock); |
4679 | fdt = files_fdtable(files); | |
4680 | if (close->fd >= fdt->max_fds) { | |
4681 | spin_unlock(&files->file_lock); | |
4682 | goto err; | |
4683 | } | |
4684 | file = fdt->fd[close->fd]; | |
a1fde923 | 4685 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4686 | spin_unlock(&files->file_lock); |
4687 | file = NULL; | |
4688 | goto err; | |
3af73b28 | 4689 | } |
b5dba59e JA |
4690 | |
4691 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4692 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4693 | spin_unlock(&files->file_lock); |
0bf0eefd | 4694 | return -EAGAIN; |
a2100672 | 4695 | } |
b5dba59e | 4696 | |
9eac1904 JA |
4697 | ret = __close_fd_get_file(close->fd, &file); |
4698 | spin_unlock(&files->file_lock); | |
4699 | if (ret < 0) { | |
4700 | if (ret == -ENOENT) | |
4701 | ret = -EBADF; | |
4702 | goto err; | |
4703 | } | |
4704 | ||
3af73b28 | 4705 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4706 | ret = filp_close(file, current->files); |
4707 | err: | |
3af73b28 | 4708 | if (ret < 0) |
93d2bcd2 | 4709 | req_set_fail(req); |
9eac1904 JA |
4710 | if (file) |
4711 | fput(file); | |
889fca73 | 4712 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4713 | return 0; |
b5dba59e JA |
4714 | } |
4715 | ||
1155c76a | 4716 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4717 | { |
4718 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4719 | |
5d17b4a4 JA |
4720 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4721 | return -EINVAL; | |
26578cda PB |
4722 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4723 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4724 | return -EINVAL; |
4725 | ||
8ed8d3c3 JA |
4726 | req->sync.off = READ_ONCE(sqe->off); |
4727 | req->sync.len = READ_ONCE(sqe->len); | |
4728 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4729 | return 0; |
4730 | } | |
4731 | ||
45d189c6 | 4732 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4733 | { |
8ed8d3c3 JA |
4734 | int ret; |
4735 | ||
ac45abc0 | 4736 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4737 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4738 | return -EAGAIN; |
4739 | ||
9adbd45d | 4740 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4741 | req->sync.flags); |
4742 | if (ret < 0) | |
93d2bcd2 | 4743 | req_set_fail(req); |
e1e16097 | 4744 | io_req_complete(req, ret); |
5d17b4a4 JA |
4745 | return 0; |
4746 | } | |
4747 | ||
469956e8 | 4748 | #if defined(CONFIG_NET) |
02d27d89 PB |
4749 | static int io_setup_async_msg(struct io_kiocb *req, |
4750 | struct io_async_msghdr *kmsg) | |
4751 | { | |
e8c2bc1f JA |
4752 | struct io_async_msghdr *async_msg = req->async_data; |
4753 | ||
4754 | if (async_msg) | |
02d27d89 | 4755 | return -EAGAIN; |
e8c2bc1f | 4756 | if (io_alloc_async_data(req)) { |
257e84a5 | 4757 | kfree(kmsg->free_iov); |
02d27d89 PB |
4758 | return -ENOMEM; |
4759 | } | |
e8c2bc1f | 4760 | async_msg = req->async_data; |
02d27d89 | 4761 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4762 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4763 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4764 | /* if were using fast_iov, set it to the new one */ |
4765 | if (!async_msg->free_iov) | |
4766 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4767 | ||
02d27d89 PB |
4768 | return -EAGAIN; |
4769 | } | |
4770 | ||
2ae523ed PB |
4771 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4772 | struct io_async_msghdr *iomsg) | |
4773 | { | |
2ae523ed | 4774 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4775 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4776 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4777 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4778 | } |
4779 | ||
93642ef8 PB |
4780 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4781 | { | |
4782 | int ret; | |
4783 | ||
93642ef8 PB |
4784 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4785 | if (!ret) | |
4786 | req->flags |= REQ_F_NEED_CLEANUP; | |
4787 | return ret; | |
4788 | } | |
4789 | ||
3529d8c2 | 4790 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4791 | { |
e47293fd | 4792 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4793 | |
d2b6f48b PB |
4794 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4795 | return -EINVAL; | |
4796 | ||
270a5940 | 4797 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4798 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4799 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4800 | if (sr->msg_flags & MSG_DONTWAIT) | |
4801 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4802 | |
d8768362 JA |
4803 | #ifdef CONFIG_COMPAT |
4804 | if (req->ctx->compat) | |
4805 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4806 | #endif | |
93642ef8 | 4807 | return 0; |
03b1230c JA |
4808 | } |
4809 | ||
889fca73 | 4810 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4811 | { |
6b754c8b | 4812 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4813 | struct socket *sock; |
7a7cacba | 4814 | unsigned flags; |
0031275d | 4815 | int min_ret = 0; |
0fa03c62 JA |
4816 | int ret; |
4817 | ||
dba4a925 | 4818 | sock = sock_from_file(req->file); |
7a7cacba | 4819 | if (unlikely(!sock)) |
dba4a925 | 4820 | return -ENOTSOCK; |
3529d8c2 | 4821 | |
d886e185 PB |
4822 | if (req_has_async_data(req)) { |
4823 | kmsg = req->async_data; | |
4824 | } else { | |
7a7cacba PB |
4825 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4826 | if (ret) | |
4827 | return ret; | |
4828 | kmsg = &iomsg; | |
0fa03c62 | 4829 | } |
0fa03c62 | 4830 | |
04411806 PB |
4831 | flags = req->sr_msg.msg_flags; |
4832 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4833 | flags |= MSG_DONTWAIT; |
0031275d SM |
4834 | if (flags & MSG_WAITALL) |
4835 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4836 | ||
7a7cacba | 4837 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4838 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4839 | return io_setup_async_msg(req, kmsg); |
4840 | if (ret == -ERESTARTSYS) | |
4841 | ret = -EINTR; | |
0fa03c62 | 4842 | |
257e84a5 PB |
4843 | /* fast path, check for non-NULL to avoid function call */ |
4844 | if (kmsg->free_iov) | |
4845 | kfree(kmsg->free_iov); | |
99bc4c38 | 4846 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4847 | if (ret < min_ret) |
93d2bcd2 | 4848 | req_set_fail(req); |
889fca73 | 4849 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4850 | return 0; |
03b1230c | 4851 | } |
aa1fa28f | 4852 | |
889fca73 | 4853 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4854 | { |
7a7cacba PB |
4855 | struct io_sr_msg *sr = &req->sr_msg; |
4856 | struct msghdr msg; | |
4857 | struct iovec iov; | |
fddaface | 4858 | struct socket *sock; |
7a7cacba | 4859 | unsigned flags; |
0031275d | 4860 | int min_ret = 0; |
fddaface JA |
4861 | int ret; |
4862 | ||
dba4a925 | 4863 | sock = sock_from_file(req->file); |
7a7cacba | 4864 | if (unlikely(!sock)) |
dba4a925 | 4865 | return -ENOTSOCK; |
fddaface | 4866 | |
7a7cacba PB |
4867 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4868 | if (unlikely(ret)) | |
14db8411 | 4869 | return ret; |
fddaface | 4870 | |
7a7cacba PB |
4871 | msg.msg_name = NULL; |
4872 | msg.msg_control = NULL; | |
4873 | msg.msg_controllen = 0; | |
4874 | msg.msg_namelen = 0; | |
fddaface | 4875 | |
04411806 PB |
4876 | flags = req->sr_msg.msg_flags; |
4877 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4878 | flags |= MSG_DONTWAIT; |
0031275d SM |
4879 | if (flags & MSG_WAITALL) |
4880 | min_ret = iov_iter_count(&msg.msg_iter); | |
4881 | ||
7a7cacba PB |
4882 | msg.msg_flags = flags; |
4883 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4884 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4885 | return -EAGAIN; |
4886 | if (ret == -ERESTARTSYS) | |
4887 | ret = -EINTR; | |
fddaface | 4888 | |
0031275d | 4889 | if (ret < min_ret) |
93d2bcd2 | 4890 | req_set_fail(req); |
889fca73 | 4891 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4892 | return 0; |
fddaface JA |
4893 | } |
4894 | ||
1400e697 PB |
4895 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4896 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4897 | { |
4898 | struct io_sr_msg *sr = &req->sr_msg; | |
4899 | struct iovec __user *uiov; | |
4900 | size_t iov_len; | |
4901 | int ret; | |
4902 | ||
1400e697 PB |
4903 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4904 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4905 | if (ret) |
4906 | return ret; | |
4907 | ||
4908 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4909 | if (iov_len > 1) | |
4910 | return -EINVAL; | |
5476dfed | 4911 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4912 | return -EFAULT; |
5476dfed | 4913 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4914 | iomsg->free_iov = NULL; |
52de1fe1 | 4915 | } else { |
257e84a5 | 4916 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4917 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4918 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4919 | false); |
52de1fe1 JA |
4920 | if (ret > 0) |
4921 | ret = 0; | |
4922 | } | |
4923 | ||
4924 | return ret; | |
4925 | } | |
4926 | ||
4927 | #ifdef CONFIG_COMPAT | |
4928 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4929 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4930 | { |
52de1fe1 JA |
4931 | struct io_sr_msg *sr = &req->sr_msg; |
4932 | struct compat_iovec __user *uiov; | |
4933 | compat_uptr_t ptr; | |
4934 | compat_size_t len; | |
4935 | int ret; | |
4936 | ||
4af3417a PB |
4937 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4938 | &ptr, &len); | |
52de1fe1 JA |
4939 | if (ret) |
4940 | return ret; | |
4941 | ||
4942 | uiov = compat_ptr(ptr); | |
4943 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4944 | compat_ssize_t clen; | |
4945 | ||
4946 | if (len > 1) | |
4947 | return -EINVAL; | |
4948 | if (!access_ok(uiov, sizeof(*uiov))) | |
4949 | return -EFAULT; | |
4950 | if (__get_user(clen, &uiov->iov_len)) | |
4951 | return -EFAULT; | |
4952 | if (clen < 0) | |
4953 | return -EINVAL; | |
2d280bc8 | 4954 | sr->len = clen; |
257e84a5 | 4955 | iomsg->free_iov = NULL; |
52de1fe1 | 4956 | } else { |
257e84a5 | 4957 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4958 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4959 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4960 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4961 | if (ret < 0) |
4962 | return ret; | |
4963 | } | |
4964 | ||
4965 | return 0; | |
4966 | } | |
4967 | #endif | |
4968 | ||
1400e697 PB |
4969 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4970 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4971 | { |
1400e697 | 4972 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4973 | |
4974 | #ifdef CONFIG_COMPAT | |
4975 | if (req->ctx->compat) | |
1400e697 | 4976 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4977 | #endif |
52de1fe1 | 4978 | |
1400e697 | 4979 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4980 | } |
4981 | ||
bcda7baa | 4982 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
51aac424 | 4983 | unsigned int issue_flags) |
bcda7baa JA |
4984 | { |
4985 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 4986 | |
51aac424 | 4987 | return io_buffer_select(req, &sr->len, sr->bgid, issue_flags); |
fddaface JA |
4988 | } |
4989 | ||
7fbb1b54 PB |
4990 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4991 | { | |
30d51dd4 | 4992 | return io_put_kbuf(req, req->kbuf); |
7fbb1b54 PB |
4993 | } |
4994 | ||
93642ef8 | 4995 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4996 | { |
99bc4c38 | 4997 | int ret; |
3529d8c2 | 4998 | |
93642ef8 PB |
4999 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
5000 | if (!ret) | |
5001 | req->flags |= REQ_F_NEED_CLEANUP; | |
5002 | return ret; | |
5003 | } | |
5004 | ||
5005 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5006 | { | |
5007 | struct io_sr_msg *sr = &req->sr_msg; | |
5008 | ||
d2b6f48b PB |
5009 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5010 | return -EINVAL; | |
5011 | ||
270a5940 | 5012 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 5013 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 5014 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
5015 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5016 | if (sr->msg_flags & MSG_DONTWAIT) | |
5017 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 5018 | |
d8768362 JA |
5019 | #ifdef CONFIG_COMPAT |
5020 | if (req->ctx->compat) | |
5021 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5022 | #endif | |
93642ef8 | 5023 | return 0; |
aa1fa28f JA |
5024 | } |
5025 | ||
889fca73 | 5026 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5027 | { |
6b754c8b | 5028 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 5029 | struct socket *sock; |
7fbb1b54 | 5030 | struct io_buffer *kbuf; |
7a7cacba | 5031 | unsigned flags; |
0031275d | 5032 | int min_ret = 0; |
52de1fe1 | 5033 | int ret, cflags = 0; |
45d189c6 | 5034 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 5035 | |
dba4a925 | 5036 | sock = sock_from_file(req->file); |
7a7cacba | 5037 | if (unlikely(!sock)) |
dba4a925 | 5038 | return -ENOTSOCK; |
3529d8c2 | 5039 | |
d886e185 PB |
5040 | if (req_has_async_data(req)) { |
5041 | kmsg = req->async_data; | |
5042 | } else { | |
7a7cacba PB |
5043 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
5044 | if (ret) | |
681fda8d | 5045 | return ret; |
7a7cacba PB |
5046 | kmsg = &iomsg; |
5047 | } | |
03b1230c | 5048 | |
bc02ef33 | 5049 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5050 | kbuf = io_recv_buffer_select(req, issue_flags); |
bc02ef33 | 5051 | if (IS_ERR(kbuf)) |
52de1fe1 | 5052 | return PTR_ERR(kbuf); |
7a7cacba | 5053 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
5054 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
5055 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
5056 | 1, req->sr_msg.len); |
5057 | } | |
52de1fe1 | 5058 | |
04411806 PB |
5059 | flags = req->sr_msg.msg_flags; |
5060 | if (force_nonblock) | |
7a7cacba | 5061 | flags |= MSG_DONTWAIT; |
0031275d SM |
5062 | if (flags & MSG_WAITALL) |
5063 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5064 | ||
7a7cacba PB |
5065 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
5066 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
5067 | if (force_nonblock && ret == -EAGAIN) |
5068 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
5069 | if (ret == -ERESTARTSYS) |
5070 | ret = -EINTR; | |
03b1230c | 5071 | |
7fbb1b54 PB |
5072 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5073 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
5074 | /* fast path, check for non-NULL to avoid function call */ |
5075 | if (kmsg->free_iov) | |
5076 | kfree(kmsg->free_iov); | |
99bc4c38 | 5077 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 5078 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5079 | req_set_fail(req); |
889fca73 | 5080 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 5081 | return 0; |
0fa03c62 | 5082 | } |
5d17b4a4 | 5083 | |
889fca73 | 5084 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5085 | { |
6b754c8b | 5086 | struct io_buffer *kbuf; |
7a7cacba PB |
5087 | struct io_sr_msg *sr = &req->sr_msg; |
5088 | struct msghdr msg; | |
5089 | void __user *buf = sr->buf; | |
fddaface | 5090 | struct socket *sock; |
7a7cacba PB |
5091 | struct iovec iov; |
5092 | unsigned flags; | |
0031275d | 5093 | int min_ret = 0; |
bcda7baa | 5094 | int ret, cflags = 0; |
45d189c6 | 5095 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5096 | |
dba4a925 | 5097 | sock = sock_from_file(req->file); |
7a7cacba | 5098 | if (unlikely(!sock)) |
dba4a925 | 5099 | return -ENOTSOCK; |
fddaface | 5100 | |
bc02ef33 | 5101 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5102 | kbuf = io_recv_buffer_select(req, issue_flags); |
bcda7baa JA |
5103 | if (IS_ERR(kbuf)) |
5104 | return PTR_ERR(kbuf); | |
7a7cacba | 5105 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5106 | } |
bcda7baa | 5107 | |
7a7cacba | 5108 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5109 | if (unlikely(ret)) |
5110 | goto out_free; | |
fddaface | 5111 | |
7a7cacba PB |
5112 | msg.msg_name = NULL; |
5113 | msg.msg_control = NULL; | |
5114 | msg.msg_controllen = 0; | |
5115 | msg.msg_namelen = 0; | |
5116 | msg.msg_iocb = NULL; | |
5117 | msg.msg_flags = 0; | |
fddaface | 5118 | |
04411806 PB |
5119 | flags = req->sr_msg.msg_flags; |
5120 | if (force_nonblock) | |
7a7cacba | 5121 | flags |= MSG_DONTWAIT; |
0031275d SM |
5122 | if (flags & MSG_WAITALL) |
5123 | min_ret = iov_iter_count(&msg.msg_iter); | |
5124 | ||
7a7cacba PB |
5125 | ret = sock_recvmsg(sock, &msg, flags); |
5126 | if (force_nonblock && ret == -EAGAIN) | |
5127 | return -EAGAIN; | |
5128 | if (ret == -ERESTARTSYS) | |
5129 | ret = -EINTR; | |
14c32eee | 5130 | out_free: |
7fbb1b54 PB |
5131 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5132 | cflags = io_put_recv_kbuf(req); | |
0031275d | 5133 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5134 | req_set_fail(req); |
889fca73 | 5135 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5136 | return 0; |
fddaface JA |
5137 | } |
5138 | ||
3529d8c2 | 5139 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5140 | { |
8ed8d3c3 JA |
5141 | struct io_accept *accept = &req->accept; |
5142 | ||
14587a46 | 5143 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5144 | return -EINVAL; |
aaa4db12 | 5145 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5146 | return -EINVAL; |
5147 | ||
d55e5f5b JA |
5148 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5149 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5150 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5151 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5152 | |
aaa4db12 PB |
5153 | accept->file_slot = READ_ONCE(sqe->file_index); |
5154 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
5155 | (accept->flags & SOCK_CLOEXEC))) | |
5156 | return -EINVAL; | |
a7083ad5 PB |
5157 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5158 | return -EINVAL; | |
5159 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5160 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5161 | return 0; |
8ed8d3c3 | 5162 | } |
17f2fe35 | 5163 | |
889fca73 | 5164 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5165 | { |
5166 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5167 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5168 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5169 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5170 | struct file *file; |
5171 | int ret, fd; | |
8ed8d3c3 | 5172 | |
e697deed JX |
5173 | if (req->file->f_flags & O_NONBLOCK) |
5174 | req->flags |= REQ_F_NOWAIT; | |
5175 | ||
aaa4db12 PB |
5176 | if (!fixed) { |
5177 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5178 | if (unlikely(fd < 0)) | |
5179 | return fd; | |
5180 | } | |
a7083ad5 PB |
5181 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5182 | accept->flags); | |
5183 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5184 | if (!fixed) |
5185 | put_unused_fd(fd); | |
a7083ad5 PB |
5186 | ret = PTR_ERR(file); |
5187 | if (ret == -EAGAIN && force_nonblock) | |
5188 | return -EAGAIN; | |
ac45abc0 PB |
5189 | if (ret == -ERESTARTSYS) |
5190 | ret = -EINTR; | |
93d2bcd2 | 5191 | req_set_fail(req); |
aaa4db12 | 5192 | } else if (!fixed) { |
a7083ad5 PB |
5193 | fd_install(fd, file); |
5194 | ret = fd; | |
aaa4db12 PB |
5195 | } else { |
5196 | ret = io_install_fixed_file(req, file, issue_flags, | |
5197 | accept->file_slot - 1); | |
ac45abc0 | 5198 | } |
889fca73 | 5199 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5200 | return 0; |
8ed8d3c3 JA |
5201 | } |
5202 | ||
93642ef8 PB |
5203 | static int io_connect_prep_async(struct io_kiocb *req) |
5204 | { | |
5205 | struct io_async_connect *io = req->async_data; | |
5206 | struct io_connect *conn = &req->connect; | |
5207 | ||
5208 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5209 | } | |
5210 | ||
3529d8c2 | 5211 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5212 | { |
3529d8c2 | 5213 | struct io_connect *conn = &req->connect; |
f499a021 | 5214 | |
14587a46 | 5215 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5216 | return -EINVAL; |
26578cda PB |
5217 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5218 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5219 | return -EINVAL; |
5220 | ||
3529d8c2 JA |
5221 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5222 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5223 | return 0; |
f499a021 JA |
5224 | } |
5225 | ||
889fca73 | 5226 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5227 | { |
e8c2bc1f | 5228 | struct io_async_connect __io, *io; |
f8e85cf2 | 5229 | unsigned file_flags; |
3fbb51c1 | 5230 | int ret; |
45d189c6 | 5231 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5232 | |
d886e185 | 5233 | if (req_has_async_data(req)) { |
e8c2bc1f | 5234 | io = req->async_data; |
f499a021 | 5235 | } else { |
3529d8c2 JA |
5236 | ret = move_addr_to_kernel(req->connect.addr, |
5237 | req->connect.addr_len, | |
e8c2bc1f | 5238 | &__io.address); |
f499a021 JA |
5239 | if (ret) |
5240 | goto out; | |
5241 | io = &__io; | |
5242 | } | |
5243 | ||
3fbb51c1 JA |
5244 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5245 | ||
e8c2bc1f | 5246 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5247 | req->connect.addr_len, file_flags); |
87f80d62 | 5248 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 5249 | if (req_has_async_data(req)) |
b7bb4f7d | 5250 | return -EAGAIN; |
e8c2bc1f | 5251 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5252 | ret = -ENOMEM; |
5253 | goto out; | |
5254 | } | |
e8c2bc1f | 5255 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5256 | return -EAGAIN; |
f499a021 | 5257 | } |
f8e85cf2 JA |
5258 | if (ret == -ERESTARTSYS) |
5259 | ret = -EINTR; | |
f499a021 | 5260 | out: |
4e88d6e7 | 5261 | if (ret < 0) |
93d2bcd2 | 5262 | req_set_fail(req); |
889fca73 | 5263 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5264 | return 0; |
469956e8 Y |
5265 | } |
5266 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5267 | #define IO_NETOP_FN(op) \ |
5268 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5269 | { \ | |
5270 | return -EOPNOTSUPP; \ | |
5271 | } | |
5272 | ||
5273 | #define IO_NETOP_PREP(op) \ | |
5274 | IO_NETOP_FN(op) \ | |
5275 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5276 | { \ | |
5277 | return -EOPNOTSUPP; \ | |
5278 | } \ | |
5279 | ||
5280 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5281 | IO_NETOP_PREP(op) \ | |
5282 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5283 | { \ | |
5284 | return -EOPNOTSUPP; \ | |
5285 | } | |
5286 | ||
5287 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5288 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5289 | IO_NETOP_PREP_ASYNC(connect); | |
5290 | IO_NETOP_PREP(accept); | |
5291 | IO_NETOP_FN(send); | |
5292 | IO_NETOP_FN(recv); | |
469956e8 | 5293 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5294 | |
d7718a9d JA |
5295 | struct io_poll_table { |
5296 | struct poll_table_struct pt; | |
5297 | struct io_kiocb *req; | |
68b11e8b | 5298 | int nr_entries; |
d7718a9d JA |
5299 | int error; |
5300 | }; | |
ce593a6c | 5301 | |
d7718a9d | 5302 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 5303 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 5304 | { |
d7718a9d JA |
5305 | /* for instances that support it check for an event match first: */ |
5306 | if (mask && !(mask & poll->events)) | |
5307 | return 0; | |
5308 | ||
5309 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5310 | ||
5311 | list_del_init(&poll->wait.entry); | |
5312 | ||
d7718a9d | 5313 | req->result = mask; |
5b0a6acc | 5314 | req->io_task_work.func = func; |
6d816e08 | 5315 | |
d7718a9d | 5316 | /* |
e3aabf95 JA |
5317 | * If this fails, then the task is exiting. When a task exits, the |
5318 | * work gets canceled, so just cancel this request as well instead | |
5319 | * of executing it. We can't safely execute it anyway, as we may not | |
5320 | * have the needed state needed for it anyway. | |
d7718a9d | 5321 | */ |
e09ee510 | 5322 | io_req_task_work_add(req); |
d7718a9d JA |
5323 | return 1; |
5324 | } | |
5325 | ||
74ce6ce4 JA |
5326 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5327 | __acquires(&req->ctx->completion_lock) | |
5328 | { | |
5329 | struct io_ring_ctx *ctx = req->ctx; | |
5330 | ||
316319e8 | 5331 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 PB |
5332 | if (unlikely(req->task->flags & PF_EXITING)) |
5333 | WRITE_ONCE(poll->canceled, true); | |
5334 | ||
74ce6ce4 JA |
5335 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5336 | struct poll_table_struct pt = { ._key = poll->events }; | |
5337 | ||
5338 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5339 | } | |
5340 | ||
79ebeaee | 5341 | spin_lock(&ctx->completion_lock); |
74ce6ce4 JA |
5342 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5343 | add_wait_queue(poll->head, &poll->wait); | |
5344 | return true; | |
5345 | } | |
5346 | ||
5347 | return false; | |
5348 | } | |
5349 | ||
d4e7cd36 | 5350 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5351 | { |
e8c2bc1f | 5352 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5353 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5354 | return req->async_data; |
d4e7cd36 JA |
5355 | return req->apoll->double_poll; |
5356 | } | |
5357 | ||
5358 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5359 | { | |
5360 | if (req->opcode == IORING_OP_POLL_ADD) | |
5361 | return &req->poll; | |
5362 | return &req->apoll->poll; | |
5363 | } | |
5364 | ||
5365 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 5366 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
5367 | { |
5368 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5369 | |
5370 | lockdep_assert_held(&req->ctx->completion_lock); | |
5371 | ||
5372 | if (poll && poll->head) { | |
5373 | struct wait_queue_head *head = poll->head; | |
5374 | ||
79ebeaee | 5375 | spin_lock_irq(&head->lock); |
18bceab1 JA |
5376 | list_del_init(&poll->wait.entry); |
5377 | if (poll->wait.private) | |
de9b4cca | 5378 | req_ref_put(req); |
18bceab1 | 5379 | poll->head = NULL; |
79ebeaee | 5380 | spin_unlock_irq(&head->lock); |
18bceab1 JA |
5381 | } |
5382 | } | |
5383 | ||
31efe48e | 5384 | static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 5385 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
5386 | { |
5387 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 5388 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 5389 | int error; |
18bceab1 | 5390 | |
e27414be | 5391 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 5392 | error = -ECANCELED; |
88e41cf9 | 5393 | req->poll.events |= EPOLLONESHOT; |
e27414be | 5394 | } else { |
5082620f | 5395 | error = mangle_poll(mask); |
e27414be | 5396 | } |
b69de288 JA |
5397 | if (req->poll.events & EPOLLONESHOT) |
5398 | flags = 0; | |
a62682f9 HX |
5399 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
5400 | req->poll.events |= EPOLLONESHOT; | |
88e41cf9 | 5401 | flags = 0; |
a62682f9 | 5402 | } |
7b289c38 HX |
5403 | if (flags & IORING_CQE_F_MORE) |
5404 | ctx->cq_extra++; | |
18bceab1 | 5405 | |
88e41cf9 | 5406 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
5407 | } |
5408 | ||
f237c30a | 5409 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5410 | { |
5411 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 5412 | struct io_kiocb *nxt; |
18bceab1 JA |
5413 | |
5414 | if (io_poll_rewait(req, &req->poll)) { | |
79ebeaee | 5415 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5416 | } else { |
f40b964a | 5417 | bool done; |
18bceab1 | 5418 | |
5b7aa38d HX |
5419 | if (req->poll.done) { |
5420 | spin_unlock(&ctx->completion_lock); | |
5421 | return; | |
5422 | } | |
31efe48e | 5423 | done = __io_poll_complete(req, req->result); |
88e41cf9 | 5424 | if (done) { |
a890d01e | 5425 | io_poll_remove_double(req); |
88e41cf9 | 5426 | hash_del(&req->hash_node); |
bd99c71b | 5427 | req->poll.done = true; |
f40b964a | 5428 | } else { |
88e41cf9 JA |
5429 | req->result = 0; |
5430 | add_wait_queue(req->poll.head, &req->poll.wait); | |
5431 | } | |
31efe48e | 5432 | io_commit_cqring(ctx); |
79ebeaee | 5433 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5434 | io_cqring_ev_posted(ctx); |
18bceab1 | 5435 | |
88e41cf9 JA |
5436 | if (done) { |
5437 | nxt = io_put_req_find_next(req); | |
5438 | if (nxt) | |
f237c30a | 5439 | io_req_task_submit(nxt, locked); |
88e41cf9 | 5440 | } |
dd221f46 | 5441 | } |
18bceab1 JA |
5442 | } |
5443 | ||
5444 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5445 | int sync, void *key) | |
5446 | { | |
5447 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5448 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 | 5449 | __poll_t mask = key_to_poll(key); |
79ebeaee | 5450 | unsigned long flags; |
18bceab1 JA |
5451 | |
5452 | /* for instances that support it check for an event match first: */ | |
5453 | if (mask && !(mask & poll->events)) | |
5454 | return 0; | |
88e41cf9 JA |
5455 | if (!(poll->events & EPOLLONESHOT)) |
5456 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5457 | |
8706e04e JA |
5458 | list_del_init(&wait->entry); |
5459 | ||
9ce85ef2 | 5460 | if (poll->head) { |
18bceab1 JA |
5461 | bool done; |
5462 | ||
79ebeaee | 5463 | spin_lock_irqsave(&poll->head->lock, flags); |
807abcb0 | 5464 | done = list_empty(&poll->wait.entry); |
18bceab1 | 5465 | if (!done) |
807abcb0 | 5466 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5467 | /* make sure double remove sees this as being gone */ |
5468 | wait->private = NULL; | |
79ebeaee | 5469 | spin_unlock_irqrestore(&poll->head->lock, flags); |
c8b5e260 JA |
5470 | if (!done) { |
5471 | /* use wait func handler, so it matches the rq type */ | |
5472 | poll->wait.func(&poll->wait, mode, sync, key); | |
5473 | } | |
18bceab1 | 5474 | } |
de9b4cca | 5475 | req_ref_put(req); |
18bceab1 JA |
5476 | return 1; |
5477 | } | |
5478 | ||
5479 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5480 | wait_queue_func_t wake_func) | |
5481 | { | |
5482 | poll->head = NULL; | |
5483 | poll->done = false; | |
5484 | poll->canceled = false; | |
464dca61 JA |
5485 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5486 | /* mask in events that we always want/need */ | |
5487 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5488 | INIT_LIST_HEAD(&poll->wait.entry); |
5489 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5490 | } | |
5491 | ||
5492 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5493 | struct wait_queue_head *head, |
5494 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5495 | { |
5496 | struct io_kiocb *req = pt->req; | |
5497 | ||
5498 | /* | |
68b11e8b PB |
5499 | * The file being polled uses multiple waitqueues for poll handling |
5500 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5501 | * if this happens. | |
18bceab1 | 5502 | */ |
68b11e8b | 5503 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5504 | struct io_poll_iocb *poll_one = poll; |
5505 | ||
23a65db8 PB |
5506 | /* double add on the same waitqueue head, ignore */ |
5507 | if (poll_one->head == head) | |
5508 | return; | |
18bceab1 | 5509 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5510 | if (*poll_ptr) { |
23a65db8 PB |
5511 | if ((*poll_ptr)->head == head) |
5512 | return; | |
18bceab1 JA |
5513 | pt->error = -EINVAL; |
5514 | return; | |
5515 | } | |
ea6a693d JA |
5516 | /* |
5517 | * Can't handle multishot for double wait for now, turn it | |
5518 | * into one-shot mode. | |
5519 | */ | |
7a274727 PB |
5520 | if (!(poll_one->events & EPOLLONESHOT)) |
5521 | poll_one->events |= EPOLLONESHOT; | |
18bceab1 JA |
5522 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5523 | if (!poll) { | |
5524 | pt->error = -ENOMEM; | |
5525 | return; | |
5526 | } | |
58852d4d | 5527 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5528 | req_ref_get(req); |
18bceab1 | 5529 | poll->wait.private = req; |
d886e185 | 5530 | |
807abcb0 | 5531 | *poll_ptr = poll; |
d886e185 PB |
5532 | if (req->opcode == IORING_OP_POLL_ADD) |
5533 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
5534 | } |
5535 | ||
68b11e8b | 5536 | pt->nr_entries++; |
18bceab1 | 5537 | poll->head = head; |
a31eb4a2 JX |
5538 | |
5539 | if (poll->events & EPOLLEXCLUSIVE) | |
5540 | add_wait_queue_exclusive(head, &poll->wait); | |
5541 | else | |
5542 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5543 | } |
5544 | ||
5545 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5546 | struct poll_table_struct *p) | |
5547 | { | |
5548 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5549 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5550 | |
807abcb0 | 5551 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5552 | } |
5553 | ||
f237c30a | 5554 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
d7718a9d | 5555 | { |
d7718a9d JA |
5556 | struct async_poll *apoll = req->apoll; |
5557 | struct io_ring_ctx *ctx = req->ctx; | |
5558 | ||
236daeae | 5559 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5560 | |
74ce6ce4 | 5561 | if (io_poll_rewait(req, &apoll->poll)) { |
79ebeaee | 5562 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5563 | return; |
d7718a9d JA |
5564 | } |
5565 | ||
0ea13b44 | 5566 | hash_del(&req->hash_node); |
d4e7cd36 | 5567 | io_poll_remove_double(req); |
bd99c71b | 5568 | apoll->poll.done = true; |
79ebeaee | 5569 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5570 | |
0be0b0e3 | 5571 | if (!READ_ONCE(apoll->poll.canceled)) |
f237c30a | 5572 | io_req_task_submit(req, locked); |
0be0b0e3 | 5573 | else |
2593553a | 5574 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5575 | } |
5576 | ||
5577 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5578 | void *key) | |
5579 | { | |
5580 | struct io_kiocb *req = wait->private; | |
5581 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5582 | ||
5583 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5584 | key_to_poll(key)); | |
5585 | ||
5586 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5587 | } | |
5588 | ||
5589 | static void io_poll_req_insert(struct io_kiocb *req) | |
5590 | { | |
5591 | struct io_ring_ctx *ctx = req->ctx; | |
5592 | struct hlist_head *list; | |
5593 | ||
5594 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5595 | hlist_add_head(&req->hash_node, list); | |
5596 | } | |
5597 | ||
5598 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5599 | struct io_poll_iocb *poll, | |
5600 | struct io_poll_table *ipt, __poll_t mask, | |
5601 | wait_queue_func_t wake_func) | |
5602 | __acquires(&ctx->completion_lock) | |
5603 | { | |
5604 | struct io_ring_ctx *ctx = req->ctx; | |
5605 | bool cancel = false; | |
5606 | ||
4d52f338 | 5607 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5608 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5609 | poll->file = req->file; |
18bceab1 | 5610 | poll->wait.private = req; |
d7718a9d JA |
5611 | |
5612 | ipt->pt._key = mask; | |
5613 | ipt->req = req; | |
68b11e8b PB |
5614 | ipt->error = 0; |
5615 | ipt->nr_entries = 0; | |
d7718a9d | 5616 | |
d7718a9d | 5617 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5618 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5619 | ipt->error = -EINVAL; | |
d7718a9d | 5620 | |
79ebeaee | 5621 | spin_lock(&ctx->completion_lock); |
a890d01e | 5622 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5623 | io_poll_remove_double(req); |
d7718a9d | 5624 | if (likely(poll->head)) { |
79ebeaee | 5625 | spin_lock_irq(&poll->head->lock); |
d7718a9d JA |
5626 | if (unlikely(list_empty(&poll->wait.entry))) { |
5627 | if (ipt->error) | |
5628 | cancel = true; | |
5629 | ipt->error = 0; | |
5630 | mask = 0; | |
5631 | } | |
88e41cf9 | 5632 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5633 | list_del_init(&poll->wait.entry); |
5634 | else if (cancel) | |
5635 | WRITE_ONCE(poll->canceled, true); | |
5636 | else if (!poll->done) /* actually waiting for an event */ | |
5637 | io_poll_req_insert(req); | |
79ebeaee | 5638 | spin_unlock_irq(&poll->head->lock); |
d7718a9d JA |
5639 | } |
5640 | ||
5641 | return mask; | |
5642 | } | |
5643 | ||
59b735ae OL |
5644 | enum { |
5645 | IO_APOLL_OK, | |
5646 | IO_APOLL_ABORTED, | |
5647 | IO_APOLL_READY | |
5648 | }; | |
5649 | ||
5650 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5651 | { |
5652 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5653 | struct io_ring_ctx *ctx = req->ctx; | |
5654 | struct async_poll *apoll; | |
5655 | struct io_poll_table ipt; | |
b2d9c3da | 5656 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
d7718a9d | 5657 | |
b2d9c3da PB |
5658 | if (!def->pollin && !def->pollout) |
5659 | return IO_APOLL_ABORTED; | |
658d0a40 PB |
5660 | if (!file_can_poll(req->file) || (req->flags & REQ_F_POLLED)) |
5661 | return IO_APOLL_ABORTED; | |
b2d9c3da PB |
5662 | |
5663 | if (def->pollin) { | |
b2d9c3da PB |
5664 | mask |= POLLIN | POLLRDNORM; |
5665 | ||
5666 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5667 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5668 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5669 | mask &= ~POLLIN; | |
5670 | } else { | |
b2d9c3da PB |
5671 | mask |= POLLOUT | POLLWRNORM; |
5672 | } | |
5673 | ||
d7718a9d JA |
5674 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); |
5675 | if (unlikely(!apoll)) | |
59b735ae | 5676 | return IO_APOLL_ABORTED; |
807abcb0 | 5677 | apoll->double_poll = NULL; |
d7718a9d | 5678 | req->apoll = apoll; |
b2d9c3da | 5679 | req->flags |= REQ_F_POLLED; |
d7718a9d | 5680 | ipt.pt._qproc = io_async_queue_proc; |
48dcd38d | 5681 | io_req_set_refcount(req); |
d7718a9d JA |
5682 | |
5683 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5684 | io_async_wake); | |
79ebeaee | 5685 | spin_unlock(&ctx->completion_lock); |
41a5169c HX |
5686 | if (ret || ipt.error) |
5687 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5688 | ||
236daeae OL |
5689 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5690 | mask, apoll->poll.events); | |
59b735ae | 5691 | return IO_APOLL_OK; |
d7718a9d JA |
5692 | } |
5693 | ||
5694 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5695 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5696 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5697 | { |
b41e9852 | 5698 | bool do_complete = false; |
221c5eb2 | 5699 | |
5082620f JA |
5700 | if (!poll->head) |
5701 | return false; | |
79ebeaee | 5702 | spin_lock_irq(&poll->head->lock); |
b2e720ac JA |
5703 | if (do_cancel) |
5704 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5705 | if (!list_empty(&poll->wait.entry)) { |
5706 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5707 | do_complete = true; |
221c5eb2 | 5708 | } |
79ebeaee | 5709 | spin_unlock_irq(&poll->head->lock); |
3bfa5bcb | 5710 | hash_del(&req->hash_node); |
d7718a9d JA |
5711 | return do_complete; |
5712 | } | |
5713 | ||
5d709043 | 5714 | static bool io_poll_remove_one(struct io_kiocb *req) |
e07785b0 | 5715 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5716 | { |
5717 | bool do_complete; | |
5718 | ||
d4e7cd36 | 5719 | io_poll_remove_double(req); |
e31001a3 | 5720 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5721 | |
b41e9852 | 5722 | if (do_complete) { |
d4d19c19 | 5723 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5724 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5725 | req_set_fail(req); |
91c2f697 | 5726 | io_put_req_deferred(req); |
5d709043 | 5727 | } |
b41e9852 | 5728 | return do_complete; |
221c5eb2 JA |
5729 | } |
5730 | ||
76e1b642 JA |
5731 | /* |
5732 | * Returns true if we found and killed one or more poll requests | |
5733 | */ | |
c072481d PB |
5734 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
5735 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 5736 | { |
78076bb6 | 5737 | struct hlist_node *tmp; |
221c5eb2 | 5738 | struct io_kiocb *req; |
8e2e1faf | 5739 | int posted = 0, i; |
221c5eb2 | 5740 | |
79ebeaee | 5741 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5742 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5743 | struct hlist_head *list; | |
5744 | ||
5745 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5746 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6af3f48b | 5747 | if (io_match_task_safe(req, tsk, cancel_all)) |
f3606e3a JA |
5748 | posted += io_poll_remove_one(req); |
5749 | } | |
221c5eb2 | 5750 | } |
79ebeaee | 5751 | spin_unlock(&ctx->completion_lock); |
b41e9852 | 5752 | |
8e2e1faf JA |
5753 | if (posted) |
5754 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5755 | |
5756 | return posted != 0; | |
221c5eb2 JA |
5757 | } |
5758 | ||
9ba5fac8 PB |
5759 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5760 | bool poll_only) | |
e07785b0 | 5761 | __must_hold(&ctx->completion_lock) |
47f46768 | 5762 | { |
78076bb6 | 5763 | struct hlist_head *list; |
47f46768 JA |
5764 | struct io_kiocb *req; |
5765 | ||
78076bb6 JA |
5766 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5767 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5768 | if (sqe_addr != req->user_data) |
5769 | continue; | |
9ba5fac8 PB |
5770 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5771 | continue; | |
b2cb805f | 5772 | return req; |
47f46768 | 5773 | } |
b2cb805f JA |
5774 | return NULL; |
5775 | } | |
5776 | ||
9ba5fac8 PB |
5777 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5778 | bool poll_only) | |
e07785b0 | 5779 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5780 | { |
5781 | struct io_kiocb *req; | |
5782 | ||
9ba5fac8 | 5783 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5784 | if (!req) |
5785 | return -ENOENT; | |
5786 | if (io_poll_remove_one(req)) | |
5787 | return 0; | |
5788 | ||
5789 | return -EALREADY; | |
47f46768 JA |
5790 | } |
5791 | ||
9096af3e PB |
5792 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5793 | unsigned int flags) | |
5794 | { | |
5795 | u32 events; | |
47f46768 | 5796 | |
9096af3e PB |
5797 | events = READ_ONCE(sqe->poll32_events); |
5798 | #ifdef __BIG_ENDIAN | |
5799 | events = swahw32(events); | |
5800 | #endif | |
5801 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5802 | events |= EPOLLONESHOT; | |
5803 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5804 | } |
5805 | ||
c5de0036 | 5806 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5807 | const struct io_uring_sqe *sqe) |
0969e783 | 5808 | { |
c5de0036 PB |
5809 | struct io_poll_update *upd = &req->poll_update; |
5810 | u32 flags; | |
5811 | ||
0969e783 JA |
5812 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5813 | return -EINVAL; | |
26578cda | 5814 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5815 | return -EINVAL; |
5816 | flags = READ_ONCE(sqe->len); | |
5817 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5818 | IORING_POLL_ADD_MULTI)) | |
5819 | return -EINVAL; | |
5820 | /* meaningless without update */ | |
5821 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5822 | return -EINVAL; |
5823 | ||
c5de0036 PB |
5824 | upd->old_user_data = READ_ONCE(sqe->addr); |
5825 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5826 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5827 | |
c5de0036 PB |
5828 | upd->new_user_data = READ_ONCE(sqe->off); |
5829 | if (!upd->update_user_data && upd->new_user_data) | |
5830 | return -EINVAL; | |
5831 | if (upd->update_events) | |
5832 | upd->events = io_poll_parse_events(sqe, flags); | |
5833 | else if (sqe->poll32_events) | |
5834 | return -EINVAL; | |
221c5eb2 | 5835 | |
221c5eb2 JA |
5836 | return 0; |
5837 | } | |
5838 | ||
221c5eb2 JA |
5839 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5840 | void *key) | |
5841 | { | |
c2f2eb7d JA |
5842 | struct io_kiocb *req = wait->private; |
5843 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5844 | |
d7718a9d | 5845 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5846 | } |
5847 | ||
221c5eb2 JA |
5848 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5849 | struct poll_table_struct *p) | |
5850 | { | |
5851 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5852 | ||
e8c2bc1f | 5853 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5854 | } |
5855 | ||
3529d8c2 | 5856 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5857 | { |
5858 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5859 | u32 flags; |
221c5eb2 JA |
5860 | |
5861 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5862 | return -EINVAL; | |
c5de0036 | 5863 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5864 | return -EINVAL; |
5865 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5866 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5867 | return -EINVAL; |
5868 | ||
48dcd38d | 5869 | io_req_set_refcount(req); |
c5de0036 | 5870 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5871 | return 0; |
5872 | } | |
5873 | ||
61e98203 | 5874 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5875 | { |
5876 | struct io_poll_iocb *poll = &req->poll; | |
5877 | struct io_ring_ctx *ctx = req->ctx; | |
5878 | struct io_poll_table ipt; | |
0969e783 | 5879 | __poll_t mask; |
5b7aa38d | 5880 | bool done; |
0969e783 | 5881 | |
d7718a9d | 5882 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5883 | |
d7718a9d JA |
5884 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5885 | io_poll_wake); | |
221c5eb2 | 5886 | |
8c838788 | 5887 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5888 | ipt.error = 0; |
eb6e6f06 PB |
5889 | done = __io_poll_complete(req, mask); |
5890 | io_commit_cqring(req->ctx); | |
221c5eb2 | 5891 | } |
79ebeaee | 5892 | spin_unlock(&ctx->completion_lock); |
221c5eb2 | 5893 | |
8c838788 JA |
5894 | if (mask) { |
5895 | io_cqring_ev_posted(ctx); | |
5b7aa38d | 5896 | if (done) |
88e41cf9 | 5897 | io_put_req(req); |
221c5eb2 | 5898 | } |
8c838788 | 5899 | return ipt.error; |
221c5eb2 JA |
5900 | } |
5901 | ||
c5de0036 | 5902 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5903 | { |
5904 | struct io_ring_ctx *ctx = req->ctx; | |
5905 | struct io_kiocb *preq; | |
cb3b200e | 5906 | bool completing; |
b69de288 JA |
5907 | int ret; |
5908 | ||
79ebeaee | 5909 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5910 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5911 | if (!preq) { |
5912 | ret = -ENOENT; | |
5913 | goto err; | |
b69de288 | 5914 | } |
cb3b200e | 5915 | |
c5de0036 PB |
5916 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5917 | completing = true; | |
5918 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5919 | goto err; | |
5920 | } | |
5921 | ||
cb3b200e JA |
5922 | /* |
5923 | * Don't allow racy completion with singleshot, as we cannot safely | |
5924 | * update those. For multishot, if we're racing with completion, just | |
5925 | * let completion re-add it. | |
5926 | */ | |
5927 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5928 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5929 | ret = -EALREADY; | |
5930 | goto err; | |
b69de288 JA |
5931 | } |
5932 | /* we now have a detached poll request. reissue. */ | |
5933 | ret = 0; | |
5934 | err: | |
b69de288 | 5935 | if (ret < 0) { |
79ebeaee | 5936 | spin_unlock(&ctx->completion_lock); |
93d2bcd2 | 5937 | req_set_fail(req); |
b69de288 JA |
5938 | io_req_complete(req, ret); |
5939 | return 0; | |
5940 | } | |
5941 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5942 | if (req->poll_update.update_events) { |
b69de288 | 5943 | preq->poll.events &= ~0xffff; |
9d805892 | 5944 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5945 | preq->poll.events |= IO_POLL_UNMASK; |
5946 | } | |
9d805892 PB |
5947 | if (req->poll_update.update_user_data) |
5948 | preq->user_data = req->poll_update.new_user_data; | |
79ebeaee | 5949 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5950 | |
b69de288 JA |
5951 | /* complete update request, we're done with it */ |
5952 | io_req_complete(req, ret); | |
5953 | ||
cb3b200e | 5954 | if (!completing) { |
c5de0036 | 5955 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5956 | if (ret < 0) { |
93d2bcd2 | 5957 | req_set_fail(preq); |
cb3b200e JA |
5958 | io_req_complete(preq, ret); |
5959 | } | |
b69de288 JA |
5960 | } |
5961 | return 0; | |
5962 | } | |
5963 | ||
f237c30a | 5964 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
89850fce | 5965 | { |
6224590d PB |
5966 | struct io_timeout_data *data = req->async_data; |
5967 | ||
5968 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) | |
5969 | req_set_fail(req); | |
505657bc | 5970 | io_req_complete_post(req, -ETIME, 0); |
89850fce JA |
5971 | } |
5972 | ||
5262f567 JA |
5973 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5974 | { | |
ad8a48ac JA |
5975 | struct io_timeout_data *data = container_of(timer, |
5976 | struct io_timeout_data, timer); | |
5977 | struct io_kiocb *req = data->req; | |
5978 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5979 | unsigned long flags; |
5980 | ||
89850fce | 5981 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5982 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5983 | atomic_set(&req->ctx->cq_timeouts, |
5984 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5985 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5986 | |
89850fce JA |
5987 | req->io_task_work.func = io_req_task_timeout; |
5988 | io_req_task_work_add(req); | |
5262f567 JA |
5989 | return HRTIMER_NORESTART; |
5990 | } | |
5991 | ||
fbd15848 PB |
5992 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5993 | __u64 user_data) | |
89850fce | 5994 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5995 | { |
fbd15848 | 5996 | struct io_timeout_data *io; |
47f46768 | 5997 | struct io_kiocb *req; |
fd9c7bc5 | 5998 | bool found = false; |
f254ac04 | 5999 | |
135fcde8 | 6000 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
6001 | found = user_data == req->user_data; |
6002 | if (found) | |
47f46768 | 6003 | break; |
47f46768 | 6004 | } |
fd9c7bc5 PB |
6005 | if (!found) |
6006 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
6007 | |
6008 | io = req->async_data; | |
fd9c7bc5 | 6009 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 6010 | return ERR_PTR(-EALREADY); |
a71976f3 | 6011 | list_del_init(&req->timeout.list); |
fbd15848 PB |
6012 | return req; |
6013 | } | |
47f46768 | 6014 | |
fbd15848 | 6015 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 6016 | __must_hold(&ctx->completion_lock) |
89850fce | 6017 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
6018 | { |
6019 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
6020 | ||
6021 | if (IS_ERR(req)) | |
6022 | return PTR_ERR(req); | |
f254ac04 | 6023 | |
93d2bcd2 | 6024 | req_set_fail(req); |
d4d19c19 | 6025 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
91c2f697 | 6026 | io_put_req_deferred(req); |
f254ac04 JA |
6027 | return 0; |
6028 | } | |
6029 | ||
50c1df2b JA |
6030 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
6031 | { | |
6032 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
6033 | case IORING_TIMEOUT_BOOTTIME: | |
6034 | return CLOCK_BOOTTIME; | |
6035 | case IORING_TIMEOUT_REALTIME: | |
6036 | return CLOCK_REALTIME; | |
6037 | default: | |
6038 | /* can't happen, vetted at prep time */ | |
6039 | WARN_ON_ONCE(1); | |
6040 | fallthrough; | |
6041 | case 0: | |
6042 | return CLOCK_MONOTONIC; | |
6043 | } | |
6044 | } | |
6045 | ||
f1042b6c PB |
6046 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6047 | struct timespec64 *ts, enum hrtimer_mode mode) | |
6048 | __must_hold(&ctx->timeout_lock) | |
6049 | { | |
6050 | struct io_timeout_data *io; | |
6051 | struct io_kiocb *req; | |
6052 | bool found = false; | |
6053 | ||
6054 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
6055 | found = user_data == req->user_data; | |
6056 | if (found) | |
6057 | break; | |
6058 | } | |
6059 | if (!found) | |
6060 | return -ENOENT; | |
6061 | ||
6062 | io = req->async_data; | |
6063 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
6064 | return -EALREADY; | |
6065 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
6066 | io->timer.function = io_link_timeout_fn; | |
6067 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
6068 | return 0; | |
6069 | } | |
6070 | ||
9c8e11b3 PB |
6071 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6072 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 6073 | __must_hold(&ctx->timeout_lock) |
47f46768 | 6074 | { |
9c8e11b3 PB |
6075 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
6076 | struct io_timeout_data *data; | |
47f46768 | 6077 | |
9c8e11b3 PB |
6078 | if (IS_ERR(req)) |
6079 | return PTR_ERR(req); | |
47f46768 | 6080 | |
9c8e11b3 PB |
6081 | req->timeout.off = 0; /* noseq */ |
6082 | data = req->async_data; | |
6083 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6084 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6085 | data->timer.function = io_timeout_fn; |
6086 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6087 | return 0; | |
47f46768 JA |
6088 | } |
6089 | ||
3529d8c2 JA |
6090 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6091 | const struct io_uring_sqe *sqe) | |
b29472ee | 6092 | { |
9c8e11b3 PB |
6093 | struct io_timeout_rem *tr = &req->timeout_rem; |
6094 | ||
b29472ee JA |
6095 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6096 | return -EINVAL; | |
61710e43 DA |
6097 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6098 | return -EINVAL; | |
26578cda | 6099 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6100 | return -EINVAL; |
6101 | ||
f1042b6c | 6102 | tr->ltimeout = false; |
9c8e11b3 PB |
6103 | tr->addr = READ_ONCE(sqe->addr); |
6104 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6105 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6106 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6107 | return -EINVAL; | |
6108 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6109 | tr->ltimeout = true; | |
6110 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6111 | return -EINVAL; |
6112 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6113 | return -EFAULT; | |
6114 | } else if (tr->flags) { | |
6115 | /* timeout removal doesn't support flags */ | |
b29472ee | 6116 | return -EINVAL; |
9c8e11b3 | 6117 | } |
b29472ee | 6118 | |
b29472ee JA |
6119 | return 0; |
6120 | } | |
6121 | ||
8662daec PB |
6122 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6123 | { | |
6124 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6125 | : HRTIMER_MODE_REL; | |
6126 | } | |
6127 | ||
11365043 JA |
6128 | /* |
6129 | * Remove or update an existing timeout command | |
6130 | */ | |
61e98203 | 6131 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6132 | { |
9c8e11b3 | 6133 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6134 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6135 | int ret; |
11365043 | 6136 | |
ec3c3d0f PB |
6137 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6138 | spin_lock(&ctx->completion_lock); | |
6139 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6140 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6141 | spin_unlock_irq(&ctx->timeout_lock); |
6142 | spin_unlock(&ctx->completion_lock); | |
6143 | } else { | |
f1042b6c PB |
6144 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6145 | ||
ec3c3d0f | 6146 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6147 | if (tr->ltimeout) |
6148 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6149 | else | |
6150 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6151 | spin_unlock_irq(&ctx->timeout_lock); |
6152 | } | |
11365043 | 6153 | |
4e88d6e7 | 6154 | if (ret < 0) |
93d2bcd2 | 6155 | req_set_fail(req); |
505657bc | 6156 | io_req_complete_post(req, ret, 0); |
11365043 | 6157 | return 0; |
5262f567 JA |
6158 | } |
6159 | ||
3529d8c2 | 6160 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6161 | bool is_timeout_link) |
5262f567 | 6162 | { |
ad8a48ac | 6163 | struct io_timeout_data *data; |
a41525ab | 6164 | unsigned flags; |
56080b02 | 6165 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6166 | |
ad8a48ac | 6167 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6168 | return -EINVAL; |
26578cda PB |
6169 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6170 | sqe->splice_fd_in) | |
a41525ab | 6171 | return -EINVAL; |
56080b02 | 6172 | if (off && is_timeout_link) |
2d28390a | 6173 | return -EINVAL; |
a41525ab | 6174 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
6175 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
6176 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
6177 | return -EINVAL; |
6178 | /* more than one clock specified is invalid, obviously */ | |
6179 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6180 | return -EINVAL; |
bdf20073 | 6181 | |
ef9dd637 | 6182 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6183 | req->timeout.off = off; |
f18ee4cf PB |
6184 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6185 | req->ctx->off_timeout_used = true; | |
26a61679 | 6186 | |
d6a644a7 PB |
6187 | if (WARN_ON_ONCE(req_has_async_data(req))) |
6188 | return -EFAULT; | |
6189 | if (io_alloc_async_data(req)) | |
26a61679 JA |
6190 | return -ENOMEM; |
6191 | ||
e8c2bc1f | 6192 | data = req->async_data; |
ad8a48ac | 6193 | data->req = req; |
50c1df2b | 6194 | data->flags = flags; |
ad8a48ac JA |
6195 | |
6196 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6197 | return -EFAULT; |
6198 | ||
f6223ff7 YB |
6199 | if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) |
6200 | return -EINVAL; | |
6201 | ||
8662daec | 6202 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6203 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6204 | |
6205 | if (is_timeout_link) { | |
6206 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6207 | ||
6208 | if (!link->head) | |
6209 | return -EINVAL; | |
6210 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6211 | return -EINVAL; | |
4d13d1a4 PB |
6212 | req->timeout.head = link->last; |
6213 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6214 | } |
ad8a48ac JA |
6215 | return 0; |
6216 | } | |
6217 | ||
61e98203 | 6218 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6219 | { |
ad8a48ac | 6220 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6221 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6222 | struct list_head *entry; |
bfe68a22 | 6223 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6224 | |
89850fce | 6225 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6226 | |
5262f567 JA |
6227 | /* |
6228 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6229 | * timeout event to be satisfied. If it isn't set, then this is |
6230 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6231 | */ |
8eb7e2d0 | 6232 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6233 | entry = ctx->timeout_list.prev; |
6234 | goto add; | |
6235 | } | |
5262f567 | 6236 | |
bfe68a22 PB |
6237 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6238 | req->timeout.target_seq = tail + off; | |
5262f567 | 6239 | |
f010505b MDG |
6240 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6241 | * This is safe because ->completion_lock is held, and submissions | |
6242 | * and completions are never mixed in the same ->completion_lock section. | |
6243 | */ | |
6244 | ctx->cq_last_tm_flush = tail; | |
6245 | ||
5262f567 JA |
6246 | /* |
6247 | * Insertion sort, ensuring the first entry in the list is always | |
6248 | * the one we need first. | |
6249 | */ | |
5262f567 | 6250 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6251 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6252 | timeout.list); | |
5262f567 | 6253 | |
8eb7e2d0 | 6254 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6255 | continue; |
bfe68a22 PB |
6256 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6257 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6258 | break; |
6259 | } | |
93bd25bb | 6260 | add: |
135fcde8 | 6261 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6262 | data->timer.function = io_timeout_fn; |
6263 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6264 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6265 | return 0; |
6266 | } | |
5262f567 | 6267 | |
f458dd84 PB |
6268 | struct io_cancel_data { |
6269 | struct io_ring_ctx *ctx; | |
6270 | u64 user_data; | |
6271 | }; | |
6272 | ||
62755e35 JA |
6273 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6274 | { | |
6275 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6276 | struct io_cancel_data *cd = data; |
62755e35 | 6277 | |
f458dd84 | 6278 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6279 | } |
6280 | ||
f458dd84 PB |
6281 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6282 | struct io_ring_ctx *ctx) | |
62755e35 | 6283 | { |
f458dd84 | 6284 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6285 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6286 | int ret = 0; |
6287 | ||
f458dd84 | 6288 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6289 | return -ENOENT; |
6290 | ||
f458dd84 | 6291 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6292 | switch (cancel_ret) { |
6293 | case IO_WQ_CANCEL_OK: | |
6294 | ret = 0; | |
6295 | break; | |
6296 | case IO_WQ_CANCEL_RUNNING: | |
6297 | ret = -EALREADY; | |
6298 | break; | |
6299 | case IO_WQ_CANCEL_NOTFOUND: | |
6300 | ret = -ENOENT; | |
6301 | break; | |
6302 | } | |
6303 | ||
e977d6d3 JA |
6304 | return ret; |
6305 | } | |
6306 | ||
8cb01fac | 6307 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6308 | { |
8cb01fac | 6309 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6310 | int ret; |
6311 | ||
dadebc35 | 6312 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6313 | |
f458dd84 | 6314 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6315 | if (ret != -ENOENT) |
8cb01fac | 6316 | return ret; |
505657bc PB |
6317 | |
6318 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6319 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6320 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6321 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6322 | if (ret != -ENOENT) |
505657bc PB |
6323 | goto out; |
6324 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6325 | out: | |
6326 | spin_unlock(&ctx->completion_lock); | |
6327 | return ret; | |
47f46768 JA |
6328 | } |
6329 | ||
3529d8c2 JA |
6330 | static int io_async_cancel_prep(struct io_kiocb *req, |
6331 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6332 | { |
fbf23849 | 6333 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6334 | return -EINVAL; |
61710e43 DA |
6335 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6336 | return -EINVAL; | |
26578cda PB |
6337 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6338 | sqe->splice_fd_in) | |
e977d6d3 JA |
6339 | return -EINVAL; |
6340 | ||
fbf23849 JA |
6341 | req->cancel.addr = READ_ONCE(sqe->addr); |
6342 | return 0; | |
6343 | } | |
6344 | ||
61e98203 | 6345 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6346 | { |
6347 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 | 6348 | u64 sqe_addr = req->cancel.addr; |
3b44b371 | 6349 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
58f99373 PB |
6350 | struct io_tctx_node *node; |
6351 | int ret; | |
6352 | ||
8cb01fac | 6353 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6354 | if (ret != -ENOENT) |
6355 | goto done; | |
58f99373 PB |
6356 | |
6357 | /* slow path, try all io-wq's */ | |
3b44b371 | 6358 | io_ring_submit_lock(ctx, needs_lock); |
58f99373 PB |
6359 | ret = -ENOENT; |
6360 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6361 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6362 | |
58f99373 PB |
6363 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6364 | if (ret != -ENOENT) | |
6365 | break; | |
6366 | } | |
3b44b371 | 6367 | io_ring_submit_unlock(ctx, needs_lock); |
58f99373 | 6368 | done: |
58f99373 | 6369 | if (ret < 0) |
93d2bcd2 | 6370 | req_set_fail(req); |
505657bc | 6371 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6372 | return 0; |
6373 | } | |
6374 | ||
269bbe5f | 6375 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6376 | const struct io_uring_sqe *sqe) |
6377 | { | |
61710e43 DA |
6378 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6379 | return -EINVAL; | |
26578cda | 6380 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6381 | return -EINVAL; |
6382 | ||
269bbe5f BM |
6383 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6384 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6385 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6386 | return -EINVAL; |
269bbe5f | 6387 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6388 | return 0; |
6389 | } | |
6390 | ||
889fca73 | 6391 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6392 | { |
6393 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 6394 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
c3bdad02 | 6395 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6396 | int ret; |
fbf23849 | 6397 | |
269bbe5f BM |
6398 | up.offset = req->rsrc_update.offset; |
6399 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6400 | up.nr = 0; |
6401 | up.tags = 0; | |
615cee49 | 6402 | up.resv = 0; |
05f3fb3c | 6403 | |
3b44b371 | 6404 | io_ring_submit_lock(ctx, needs_lock); |
fdecb662 | 6405 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6406 | &up, req->rsrc_update.nr_args); |
3b44b371 | 6407 | io_ring_submit_unlock(ctx, needs_lock); |
05f3fb3c JA |
6408 | |
6409 | if (ret < 0) | |
93d2bcd2 | 6410 | req_set_fail(req); |
889fca73 | 6411 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6412 | return 0; |
6413 | } | |
6414 | ||
bfe76559 | 6415 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6416 | { |
d625c6ee | 6417 | switch (req->opcode) { |
e781573e | 6418 | case IORING_OP_NOP: |
bfe76559 | 6419 | return 0; |
f67676d1 JA |
6420 | case IORING_OP_READV: |
6421 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6422 | case IORING_OP_READ: |
bfe76559 | 6423 | return io_read_prep(req, sqe); |
f67676d1 JA |
6424 | case IORING_OP_WRITEV: |
6425 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6426 | case IORING_OP_WRITE: |
bfe76559 | 6427 | return io_write_prep(req, sqe); |
0969e783 | 6428 | case IORING_OP_POLL_ADD: |
bfe76559 | 6429 | return io_poll_add_prep(req, sqe); |
0969e783 | 6430 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6431 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6432 | case IORING_OP_FSYNC: |
1155c76a | 6433 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6434 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6435 | return io_sfr_prep(req, sqe); |
03b1230c | 6436 | case IORING_OP_SENDMSG: |
fddaface | 6437 | case IORING_OP_SEND: |
bfe76559 | 6438 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6439 | case IORING_OP_RECVMSG: |
fddaface | 6440 | case IORING_OP_RECV: |
bfe76559 | 6441 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6442 | case IORING_OP_CONNECT: |
bfe76559 | 6443 | return io_connect_prep(req, sqe); |
2d28390a | 6444 | case IORING_OP_TIMEOUT: |
bfe76559 | 6445 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6446 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6447 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6448 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6449 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6450 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6451 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6452 | case IORING_OP_ACCEPT: |
bfe76559 | 6453 | return io_accept_prep(req, sqe); |
d63d1b5e | 6454 | case IORING_OP_FALLOCATE: |
bfe76559 | 6455 | return io_fallocate_prep(req, sqe); |
15b71abe | 6456 | case IORING_OP_OPENAT: |
bfe76559 | 6457 | return io_openat_prep(req, sqe); |
b5dba59e | 6458 | case IORING_OP_CLOSE: |
bfe76559 | 6459 | return io_close_prep(req, sqe); |
05f3fb3c | 6460 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6461 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6462 | case IORING_OP_STATX: |
bfe76559 | 6463 | return io_statx_prep(req, sqe); |
4840e418 | 6464 | case IORING_OP_FADVISE: |
bfe76559 | 6465 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6466 | case IORING_OP_MADVISE: |
bfe76559 | 6467 | return io_madvise_prep(req, sqe); |
cebdb986 | 6468 | case IORING_OP_OPENAT2: |
bfe76559 | 6469 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6470 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6471 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6472 | case IORING_OP_SPLICE: |
bfe76559 | 6473 | return io_splice_prep(req, sqe); |
ddf0322d | 6474 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6475 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6476 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6477 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6478 | case IORING_OP_TEE: |
bfe76559 | 6479 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6480 | case IORING_OP_SHUTDOWN: |
6481 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6482 | case IORING_OP_RENAMEAT: |
6483 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6484 | case IORING_OP_UNLINKAT: |
6485 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6486 | case IORING_OP_MKDIRAT: |
6487 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6488 | case IORING_OP_SYMLINKAT: |
6489 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6490 | case IORING_OP_LINKAT: |
6491 | return io_linkat_prep(req, sqe); | |
f67676d1 JA |
6492 | } |
6493 | ||
bfe76559 PB |
6494 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6495 | req->opcode); | |
bd54b6fe | 6496 | return -EINVAL; |
bfe76559 PB |
6497 | } |
6498 | ||
93642ef8 | 6499 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6500 | { |
b7e298d2 PB |
6501 | if (!io_op_defs[req->opcode].needs_async_setup) |
6502 | return 0; | |
d886e185 | 6503 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
6504 | return -EFAULT; |
6505 | if (io_alloc_async_data(req)) | |
6506 | return -EAGAIN; | |
6507 | ||
93642ef8 PB |
6508 | switch (req->opcode) { |
6509 | case IORING_OP_READV: | |
93642ef8 PB |
6510 | return io_rw_prep_async(req, READ); |
6511 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6512 | return io_rw_prep_async(req, WRITE); |
6513 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6514 | return io_sendmsg_prep_async(req); |
6515 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6516 | return io_recvmsg_prep_async(req); |
6517 | case IORING_OP_CONNECT: | |
6518 | return io_connect_prep_async(req); | |
6519 | } | |
b7e298d2 PB |
6520 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6521 | req->opcode); | |
6522 | return -EFAULT; | |
f67676d1 JA |
6523 | } |
6524 | ||
9cf7c104 PB |
6525 | static u32 io_get_sequence(struct io_kiocb *req) |
6526 | { | |
a3dbdf54 | 6527 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6528 | |
a3dbdf54 PB |
6529 | /* need original cached_sq_head, but it was increased for each req */ |
6530 | io_for_each_link(req, req) | |
6531 | seq--; | |
6532 | return seq; | |
9cf7c104 PB |
6533 | } |
6534 | ||
c072481d | 6535 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 6536 | { |
a197f664 | 6537 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6538 | struct io_defer_entry *de; |
f67676d1 | 6539 | int ret; |
e0eb71dc | 6540 | u32 seq = io_get_sequence(req); |
3c19966d | 6541 | |
9d858b21 | 6542 | /* Still need defer if there is pending req in defer list. */ |
5e371265 | 6543 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e0eb71dc | 6544 | queue: |
10c66904 | 6545 | ctx->drain_active = false; |
e0eb71dc PB |
6546 | io_req_task_queue(req); |
6547 | return; | |
10c66904 | 6548 | } |
9cf7c104 | 6549 | |
b7e298d2 | 6550 | ret = io_req_prep_async(req); |
e0eb71dc PB |
6551 | if (ret) { |
6552 | fail: | |
6553 | io_req_complete_failed(req, ret); | |
6554 | return; | |
6555 | } | |
cbdcb435 | 6556 | io_prep_async_link(req); |
27dc8338 | 6557 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6558 | if (!de) { |
1b48773f | 6559 | ret = -ENOMEM; |
e0eb71dc | 6560 | goto fail; |
76cc33d7 | 6561 | } |
2d28390a | 6562 | |
79ebeaee | 6563 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6564 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6565 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6566 | kfree(de); |
e0eb71dc | 6567 | goto queue; |
de0617e4 JA |
6568 | } |
6569 | ||
915967f6 | 6570 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6571 | de->req = req; |
9cf7c104 | 6572 | de->seq = seq; |
27dc8338 | 6573 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6574 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
6575 | } |
6576 | ||
68fb8979 | 6577 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6578 | { |
0e1b6fe3 | 6579 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 PB |
6580 | kfree(req->kbuf); |
6581 | req->kbuf = NULL; | |
99bc4c38 PB |
6582 | } |
6583 | ||
0e1b6fe3 PB |
6584 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6585 | switch (req->opcode) { | |
6586 | case IORING_OP_READV: | |
6587 | case IORING_OP_READ_FIXED: | |
6588 | case IORING_OP_READ: | |
6589 | case IORING_OP_WRITEV: | |
6590 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6591 | case IORING_OP_WRITE: { |
6592 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6593 | |
6594 | kfree(io->free_iovec); | |
0e1b6fe3 | 6595 | break; |
e8c2bc1f | 6596 | } |
0e1b6fe3 | 6597 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6598 | case IORING_OP_SENDMSG: { |
6599 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6600 | |
6601 | kfree(io->free_iov); | |
0e1b6fe3 | 6602 | break; |
e8c2bc1f | 6603 | } |
0e1b6fe3 PB |
6604 | case IORING_OP_SPLICE: |
6605 | case IORING_OP_TEE: | |
e1d767f0 PB |
6606 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6607 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6608 | break; |
f3cd4850 JA |
6609 | case IORING_OP_OPENAT: |
6610 | case IORING_OP_OPENAT2: | |
6611 | if (req->open.filename) | |
6612 | putname(req->open.filename); | |
6613 | break; | |
80a261fd JA |
6614 | case IORING_OP_RENAMEAT: |
6615 | putname(req->rename.oldpath); | |
6616 | putname(req->rename.newpath); | |
6617 | break; | |
14a1143b JA |
6618 | case IORING_OP_UNLINKAT: |
6619 | putname(req->unlink.filename); | |
6620 | break; | |
e34a02dc DK |
6621 | case IORING_OP_MKDIRAT: |
6622 | putname(req->mkdir.filename); | |
6623 | break; | |
7a8721f8 DK |
6624 | case IORING_OP_SYMLINKAT: |
6625 | putname(req->symlink.oldpath); | |
6626 | putname(req->symlink.newpath); | |
6627 | break; | |
cf30da90 DK |
6628 | case IORING_OP_LINKAT: |
6629 | putname(req->hardlink.oldpath); | |
6630 | putname(req->hardlink.newpath); | |
6631 | break; | |
0e1b6fe3 | 6632 | } |
99bc4c38 | 6633 | } |
75652a30 JA |
6634 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6635 | kfree(req->apoll->double_poll); | |
6636 | kfree(req->apoll); | |
6637 | req->apoll = NULL; | |
6638 | } | |
3a0a6902 PB |
6639 | if (req->flags & REQ_F_INFLIGHT) { |
6640 | struct io_uring_task *tctx = req->task->io_uring; | |
6641 | ||
6642 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6643 | } |
c854357b | 6644 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6645 | put_cred(req->creds); |
d886e185 PB |
6646 | if (req->flags & REQ_F_ASYNC_DATA) { |
6647 | kfree(req->async_data); | |
6648 | req->async_data = NULL; | |
6649 | } | |
c854357b | 6650 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
6651 | } |
6652 | ||
889fca73 | 6653 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6654 | { |
5730b27e | 6655 | const struct cred *creds = NULL; |
d625c6ee | 6656 | int ret; |
2b188cc1 | 6657 | |
6878b40e | 6658 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 6659 | creds = override_creds(req->creds); |
5730b27e | 6660 | |
5bd2182d PM |
6661 | if (!io_op_defs[req->opcode].audit_skip) |
6662 | audit_uring_entry(req->opcode); | |
6663 | ||
d625c6ee | 6664 | switch (req->opcode) { |
2b188cc1 | 6665 | case IORING_OP_NOP: |
889fca73 | 6666 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6667 | break; |
6668 | case IORING_OP_READV: | |
edafccee | 6669 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6670 | case IORING_OP_READ: |
889fca73 | 6671 | ret = io_read(req, issue_flags); |
edafccee | 6672 | break; |
3529d8c2 | 6673 | case IORING_OP_WRITEV: |
edafccee | 6674 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6675 | case IORING_OP_WRITE: |
889fca73 | 6676 | ret = io_write(req, issue_flags); |
2b188cc1 | 6677 | break; |
c992fe29 | 6678 | case IORING_OP_FSYNC: |
45d189c6 | 6679 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6680 | break; |
221c5eb2 | 6681 | case IORING_OP_POLL_ADD: |
61e98203 | 6682 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6683 | break; |
6684 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6685 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6686 | break; |
5d17b4a4 | 6687 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6688 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6689 | break; |
0fa03c62 | 6690 | case IORING_OP_SENDMSG: |
889fca73 | 6691 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6692 | break; |
fddaface | 6693 | case IORING_OP_SEND: |
889fca73 | 6694 | ret = io_send(req, issue_flags); |
0fa03c62 | 6695 | break; |
aa1fa28f | 6696 | case IORING_OP_RECVMSG: |
889fca73 | 6697 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6698 | break; |
fddaface | 6699 | case IORING_OP_RECV: |
889fca73 | 6700 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6701 | break; |
5262f567 | 6702 | case IORING_OP_TIMEOUT: |
61e98203 | 6703 | ret = io_timeout(req, issue_flags); |
5262f567 | 6704 | break; |
11365043 | 6705 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6706 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6707 | break; |
17f2fe35 | 6708 | case IORING_OP_ACCEPT: |
889fca73 | 6709 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6710 | break; |
f8e85cf2 | 6711 | case IORING_OP_CONNECT: |
889fca73 | 6712 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6713 | break; |
62755e35 | 6714 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6715 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6716 | break; |
d63d1b5e | 6717 | case IORING_OP_FALLOCATE: |
45d189c6 | 6718 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6719 | break; |
15b71abe | 6720 | case IORING_OP_OPENAT: |
45d189c6 | 6721 | ret = io_openat(req, issue_flags); |
15b71abe | 6722 | break; |
b5dba59e | 6723 | case IORING_OP_CLOSE: |
889fca73 | 6724 | ret = io_close(req, issue_flags); |
b5dba59e | 6725 | break; |
05f3fb3c | 6726 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6727 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6728 | break; |
eddc7ef5 | 6729 | case IORING_OP_STATX: |
45d189c6 | 6730 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6731 | break; |
4840e418 | 6732 | case IORING_OP_FADVISE: |
45d189c6 | 6733 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6734 | break; |
c1ca757b | 6735 | case IORING_OP_MADVISE: |
45d189c6 | 6736 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6737 | break; |
cebdb986 | 6738 | case IORING_OP_OPENAT2: |
45d189c6 | 6739 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6740 | break; |
3e4827b0 | 6741 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6742 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6743 | break; |
7d67af2c | 6744 | case IORING_OP_SPLICE: |
45d189c6 | 6745 | ret = io_splice(req, issue_flags); |
7d67af2c | 6746 | break; |
ddf0322d | 6747 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6748 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6749 | break; |
067524e9 | 6750 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6751 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6752 | break; |
f2a8d5c7 | 6753 | case IORING_OP_TEE: |
45d189c6 | 6754 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6755 | break; |
36f4fa68 | 6756 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6757 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6758 | break; |
80a261fd | 6759 | case IORING_OP_RENAMEAT: |
45d189c6 | 6760 | ret = io_renameat(req, issue_flags); |
80a261fd | 6761 | break; |
14a1143b | 6762 | case IORING_OP_UNLINKAT: |
45d189c6 | 6763 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6764 | break; |
e34a02dc DK |
6765 | case IORING_OP_MKDIRAT: |
6766 | ret = io_mkdirat(req, issue_flags); | |
6767 | break; | |
7a8721f8 DK |
6768 | case IORING_OP_SYMLINKAT: |
6769 | ret = io_symlinkat(req, issue_flags); | |
6770 | break; | |
cf30da90 DK |
6771 | case IORING_OP_LINKAT: |
6772 | ret = io_linkat(req, issue_flags); | |
6773 | break; | |
2b188cc1 JA |
6774 | default: |
6775 | ret = -EINVAL; | |
6776 | break; | |
6777 | } | |
6778 | ||
5bd2182d PM |
6779 | if (!io_op_defs[req->opcode].audit_skip) |
6780 | audit_uring_exit(!ret, ret); | |
6781 | ||
5730b27e JA |
6782 | if (creds) |
6783 | revert_creds(creds); | |
def596e9 JA |
6784 | if (ret) |
6785 | return ret; | |
b532576e | 6786 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 6787 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 6788 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
6789 | |
6790 | return 0; | |
2b188cc1 JA |
6791 | } |
6792 | ||
ebc11b6c PB |
6793 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6794 | { | |
6795 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6796 | ||
6797 | req = io_put_req_find_next(req); | |
6798 | return req ? &req->work : NULL; | |
6799 | } | |
6800 | ||
5280f7e5 | 6801 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6802 | { |
6803 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
d01905db PB |
6804 | unsigned int issue_flags = IO_URING_F_UNLOCKED; |
6805 | bool needs_poll = false; | |
6df1db6b | 6806 | struct io_kiocb *timeout; |
561fb04a | 6807 | int ret = 0; |
2b188cc1 | 6808 | |
48dcd38d PB |
6809 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6810 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6811 | __io_req_set_refcount(req, 2); | |
6812 | else | |
6813 | req_ref_get(req); | |
5d5901a3 | 6814 | |
6df1db6b PB |
6815 | timeout = io_prep_linked_timeout(req); |
6816 | if (timeout) | |
6817 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6818 | |
dadebc35 | 6819 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
d01905db PB |
6820 | if (work->flags & IO_WQ_WORK_CANCEL) { |
6821 | io_req_task_queue_fail(req, -ECANCELED); | |
6822 | return; | |
6823 | } | |
31b51510 | 6824 | |
d01905db | 6825 | if (req->flags & REQ_F_FORCE_ASYNC) { |
afb7f56f PB |
6826 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
6827 | bool opcode_poll = def->pollin || def->pollout; | |
6828 | ||
6829 | if (opcode_poll && file_can_poll(req->file)) { | |
6830 | needs_poll = true; | |
d01905db | 6831 | issue_flags |= IO_URING_F_NONBLOCK; |
afb7f56f | 6832 | } |
561fb04a | 6833 | } |
31b51510 | 6834 | |
d01905db PB |
6835 | do { |
6836 | ret = io_issue_sqe(req, issue_flags); | |
6837 | if (ret != -EAGAIN) | |
6838 | break; | |
6839 | /* | |
6840 | * We can get EAGAIN for iopolled IO even though we're | |
6841 | * forcing a sync submission from here, since we can't | |
6842 | * wait for request slots on the block side. | |
6843 | */ | |
6844 | if (!needs_poll) { | |
6845 | cond_resched(); | |
6846 | continue; | |
90fa0288 HX |
6847 | } |
6848 | ||
d01905db PB |
6849 | if (io_arm_poll_handler(req) == IO_APOLL_OK) |
6850 | return; | |
6851 | /* aborted or ready, in either case retry blocking */ | |
6852 | needs_poll = false; | |
6853 | issue_flags &= ~IO_URING_F_NONBLOCK; | |
6854 | } while (1); | |
31b51510 | 6855 | |
a3df7698 | 6856 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6857 | if (ret) |
a3df7698 | 6858 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6859 | } |
6860 | ||
aeca241b | 6861 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6862 | unsigned i) |
65e19f54 | 6863 | { |
042b0d85 | 6864 | return &table->files[i]; |
dafecf19 PB |
6865 | } |
6866 | ||
65e19f54 JA |
6867 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6868 | int index) | |
6869 | { | |
aeca241b | 6870 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6871 | |
a04b0ac0 | 6872 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6873 | } |
6874 | ||
a04b0ac0 | 6875 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6876 | { |
6877 | unsigned long file_ptr = (unsigned long) file; | |
6878 | ||
88459b50 | 6879 | file_ptr |= io_file_get_flags(file); |
a04b0ac0 | 6880 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6881 | } |
6882 | ||
ac177053 PB |
6883 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6884 | struct io_kiocb *req, int fd) | |
09bb8394 | 6885 | { |
8da11c19 | 6886 | struct file *file; |
ac177053 | 6887 | unsigned long file_ptr; |
09bb8394 | 6888 | |
ac177053 PB |
6889 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6890 | return NULL; | |
6891 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6892 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6893 | file = (struct file *) (file_ptr & FFS_MASK); | |
6894 | file_ptr &= ~FFS_MASK; | |
6895 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 6896 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
a46be971 | 6897 | io_req_set_rsrc_node(req, ctx); |
ac177053 PB |
6898 | return file; |
6899 | } | |
d44f554e | 6900 | |
ac177053 | 6901 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6902 | struct io_kiocb *req, int fd) |
6903 | { | |
62906e89 | 6904 | struct file *file = fget(fd); |
ac177053 PB |
6905 | |
6906 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6907 | |
ac177053 PB |
6908 | /* we don't allow fixed io_uring files */ |
6909 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6910 | io_req_track_inflight(req); | |
8371adf5 | 6911 | return file; |
09bb8394 JA |
6912 | } |
6913 | ||
ac177053 | 6914 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6915 | struct io_kiocb *req, int fd, bool fixed) |
6916 | { | |
6917 | if (fixed) | |
6918 | return io_file_get_fixed(ctx, req, fd); | |
6919 | else | |
62906e89 | 6920 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6921 | } |
6922 | ||
f237c30a | 6923 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6924 | { |
6925 | struct io_kiocb *prev = req->timeout.prev; | |
617a8948 | 6926 | int ret = -ENOENT; |
89b263f6 JA |
6927 | |
6928 | if (prev) { | |
617a8948 PB |
6929 | if (!(req->task->flags & PF_EXITING)) |
6930 | ret = io_try_cancel_userdata(req, prev->user_data); | |
505657bc | 6931 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6932 | io_put_req(prev); |
89b263f6 JA |
6933 | } else { |
6934 | io_req_complete_post(req, -ETIME, 0); | |
6935 | } | |
6936 | } | |
6937 | ||
2665abfd | 6938 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6939 | { |
ad8a48ac JA |
6940 | struct io_timeout_data *data = container_of(timer, |
6941 | struct io_timeout_data, timer); | |
90cd7e42 | 6942 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6943 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6944 | unsigned long flags; |
2665abfd | 6945 | |
89b263f6 | 6946 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6947 | prev = req->timeout.head; |
6948 | req->timeout.head = NULL; | |
2665abfd JA |
6949 | |
6950 | /* | |
6951 | * We don't expect the list to be empty, that will only happen if we | |
6952 | * race with the completion of the linked work. | |
6953 | */ | |
447c19f3 | 6954 | if (prev) { |
f2f87370 | 6955 | io_remove_next_linked(prev); |
447c19f3 PB |
6956 | if (!req_ref_inc_not_zero(prev)) |
6957 | prev = NULL; | |
6958 | } | |
ef9dd637 | 6959 | list_del(&req->timeout.list); |
89b263f6 JA |
6960 | req->timeout.prev = prev; |
6961 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6962 | |
89b263f6 JA |
6963 | req->io_task_work.func = io_req_task_link_timeout; |
6964 | io_req_task_work_add(req); | |
2665abfd JA |
6965 | return HRTIMER_NORESTART; |
6966 | } | |
6967 | ||
de968c18 | 6968 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6969 | { |
de968c18 PB |
6970 | struct io_ring_ctx *ctx = req->ctx; |
6971 | ||
89b263f6 | 6972 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6973 | /* |
f2f87370 PB |
6974 | * If the back reference is NULL, then our linked request finished |
6975 | * before we got a chance to setup the timer | |
76a46e06 | 6976 | */ |
90cd7e42 | 6977 | if (req->timeout.head) { |
e8c2bc1f | 6978 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6979 | |
ad8a48ac JA |
6980 | data->timer.function = io_link_timeout_fn; |
6981 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6982 | data->mode); | |
ef9dd637 | 6983 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6984 | } |
89b263f6 | 6985 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6986 | /* drop submission reference */ |
76a46e06 JA |
6987 | io_put_req(req); |
6988 | } | |
2665abfd | 6989 | |
d475a9a6 PB |
6990 | static void io_queue_sqe_arm_apoll(struct io_kiocb *req) |
6991 | __must_hold(&req->ctx->uring_lock) | |
6992 | { | |
6993 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); | |
6994 | ||
6995 | switch (io_arm_poll_handler(req)) { | |
6996 | case IO_APOLL_READY: | |
d475a9a6 PB |
6997 | io_req_task_queue(req); |
6998 | break; | |
6999 | case IO_APOLL_ABORTED: | |
7000 | /* | |
7001 | * Queued up for async execution, worker will release | |
7002 | * submit reference when the iocb is actually submitted. | |
7003 | */ | |
7004 | io_queue_async_work(req, NULL); | |
7005 | break; | |
7006 | } | |
7007 | ||
7008 | if (linked_timeout) | |
7009 | io_queue_linked_timeout(linked_timeout); | |
7010 | } | |
7011 | ||
7012 | static inline void __io_queue_sqe(struct io_kiocb *req) | |
282cdc86 | 7013 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 7014 | { |
906c6caa | 7015 | struct io_kiocb *linked_timeout; |
e0c5c576 | 7016 | int ret; |
2b188cc1 | 7017 | |
c5eef2b9 | 7018 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 7019 | |
fff4e40e PB |
7020 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
7021 | io_req_add_compl_list(req); | |
d9f9d284 | 7022 | return; |
fff4e40e | 7023 | } |
491381ce JA |
7024 | /* |
7025 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
7026 | * doesn't support non-blocking read/write attempts | |
7027 | */ | |
1840038e | 7028 | if (likely(!ret)) { |
906c6caa PB |
7029 | linked_timeout = io_prep_linked_timeout(req); |
7030 | if (linked_timeout) | |
7031 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 7032 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d475a9a6 | 7033 | io_queue_sqe_arm_apoll(req); |
0d63c148 | 7034 | } else { |
f41db273 | 7035 | io_req_complete_failed(req, ret); |
9e645e11 | 7036 | } |
2b188cc1 JA |
7037 | } |
7038 | ||
4652fe3f | 7039 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 7040 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 7041 | { |
4652fe3f | 7042 | if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 7043 | io_req_complete_fail_submit(req); |
e0eb71dc PB |
7044 | } else if (unlikely(req->ctx->drain_active)) { |
7045 | io_drain_req(req); | |
76cc33d7 PB |
7046 | } else { |
7047 | int ret = io_req_prep_async(req); | |
7048 | ||
7049 | if (unlikely(ret)) | |
7050 | io_req_complete_failed(req, ret); | |
7051 | else | |
f237c30a | 7052 | io_queue_async_work(req, NULL); |
ce35a47a | 7053 | } |
4fe2c963 JL |
7054 | } |
7055 | ||
4652fe3f PB |
7056 | static inline void io_queue_sqe(struct io_kiocb *req) |
7057 | __must_hold(&req->ctx->uring_lock) | |
7058 | { | |
7059 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) | |
7060 | __io_queue_sqe(req); | |
7061 | else | |
7062 | io_queue_sqe_fallback(req); | |
7063 | } | |
7064 | ||
b16fed66 PB |
7065 | /* |
7066 | * Check SQE restrictions (opcode and flags). | |
7067 | * | |
7068 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
7069 | */ | |
7070 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
7071 | struct io_kiocb *req, | |
7072 | unsigned int sqe_flags) | |
4fe2c963 | 7073 | { |
b16fed66 PB |
7074 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
7075 | return false; | |
7076 | ||
7077 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
7078 | ctx->restrictions.sqe_flags_required) | |
7079 | return false; | |
7080 | ||
7081 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
7082 | ctx->restrictions.sqe_flags_required)) | |
7083 | return false; | |
7084 | ||
7085 | return true; | |
4fe2c963 JL |
7086 | } |
7087 | ||
22b2ca31 PB |
7088 | static void io_init_req_drain(struct io_kiocb *req) |
7089 | { | |
7090 | struct io_ring_ctx *ctx = req->ctx; | |
7091 | struct io_kiocb *head = ctx->submit_state.link.head; | |
7092 | ||
7093 | ctx->drain_active = true; | |
7094 | if (head) { | |
7095 | /* | |
7096 | * If we need to drain a request in the middle of a link, drain | |
7097 | * the head request and the next request/link after the current | |
7098 | * link. Considering sequential execution of links, | |
7099 | * IOSQE_IO_DRAIN will be maintained for every request of our | |
7100 | * link. | |
7101 | */ | |
7102 | head->flags |= IOSQE_IO_DRAIN | REQ_F_FORCE_ASYNC; | |
7103 | ctx->drain_next = true; | |
7104 | } | |
7105 | } | |
7106 | ||
b16fed66 PB |
7107 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7108 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7109 | __must_hold(&ctx->uring_lock) |
b16fed66 | 7110 | { |
b16fed66 | 7111 | unsigned int sqe_flags; |
fc0ae024 | 7112 | int personality; |
4a04d1d1 | 7113 | u8 opcode; |
b16fed66 | 7114 | |
864ea921 | 7115 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 7116 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
7117 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
7118 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7119 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7120 | req->file = NULL; |
b16fed66 | 7121 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7122 | req->task = current; |
b16fed66 | 7123 | |
4a04d1d1 PB |
7124 | if (unlikely(opcode >= IORING_OP_LAST)) { |
7125 | req->opcode = 0; | |
b16fed66 | 7126 | return -EINVAL; |
4a04d1d1 | 7127 | } |
68fe256a PB |
7128 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
7129 | /* enforce forwards compatibility on users */ | |
7130 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
7131 | return -EINVAL; | |
7132 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
4a04d1d1 | 7133 | !io_op_defs[opcode].buffer_select) |
68fe256a | 7134 | return -EOPNOTSUPP; |
22b2ca31 PB |
7135 | if (sqe_flags & IOSQE_IO_DRAIN) |
7136 | io_init_req_drain(req); | |
2a56a9bd PB |
7137 | } |
7138 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
7139 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
7140 | return -EACCES; | |
7141 | /* knock it to the slow queue path, will be drained there */ | |
7142 | if (ctx->drain_active) | |
7143 | req->flags |= REQ_F_FORCE_ASYNC; | |
7144 | /* if there is no link, we're at "next" request and need to drain */ | |
7145 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
7146 | ctx->drain_next = false; | |
7147 | ctx->drain_active = true; | |
22b2ca31 | 7148 | req->flags |= IOSQE_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 7149 | } |
68fe256a | 7150 | } |
b16fed66 | 7151 | |
4a04d1d1 | 7152 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
7153 | struct io_submit_state *state = &ctx->submit_state; |
7154 | ||
7155 | /* | |
7156 | * Plug now if we have more than 2 IO left after this, and the | |
7157 | * target is potentially a read/write to block based storage. | |
7158 | */ | |
4a04d1d1 | 7159 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
7160 | state->plug_started = true; |
7161 | state->need_plug = false; | |
5ca7a8b3 | 7162 | blk_start_plug_nr_ios(&state->plug, state->submit_nr); |
6d63416d PB |
7163 | } |
7164 | ||
62906e89 | 7165 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 7166 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 | 7167 | if (unlikely(!req->file)) |
fc0ae024 | 7168 | return -EBADF; |
b16fed66 | 7169 | } |
863e0560 | 7170 | |
003e8dcc JA |
7171 | personality = READ_ONCE(sqe->personality); |
7172 | if (personality) { | |
cdab10bf LT |
7173 | int ret; |
7174 | ||
c10d1f98 PB |
7175 | req->creds = xa_load(&ctx->personalities, personality); |
7176 | if (!req->creds) | |
003e8dcc | 7177 | return -EINVAL; |
c10d1f98 | 7178 | get_cred(req->creds); |
cdc1404a PM |
7179 | ret = security_uring_override_creds(req->creds); |
7180 | if (ret) { | |
7181 | put_cred(req->creds); | |
7182 | return ret; | |
7183 | } | |
b8e64b53 | 7184 | req->flags |= REQ_F_CREDS; |
003e8dcc | 7185 | } |
b16fed66 | 7186 | |
fc0ae024 | 7187 | return io_req_prep(req, sqe); |
b16fed66 PB |
7188 | } |
7189 | ||
a6b8cadc | 7190 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7191 | const struct io_uring_sqe *sqe) |
282cdc86 | 7192 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7193 | { |
a1ab7b35 | 7194 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7195 | int ret; |
9e645e11 | 7196 | |
a6b8cadc PB |
7197 | ret = io_init_req(ctx, req, sqe); |
7198 | if (unlikely(ret)) { | |
a87acfde JA |
7199 | trace_io_uring_req_failed(sqe, ret); |
7200 | ||
a8295b98 | 7201 | /* fail even hard links since we don't submit */ |
de59bc10 | 7202 | if (link->head) { |
a8295b98 HX |
7203 | /* |
7204 | * we can judge a link req is failed or cancelled by if | |
7205 | * REQ_F_FAIL is set, but the head is an exception since | |
7206 | * it may be set REQ_F_FAIL because of other req's failure | |
7207 | * so let's leverage req->result to distinguish if a head | |
7208 | * is set REQ_F_FAIL because of its failure or other req's | |
7209 | * failure so that we can set the correct ret code for it. | |
7210 | * init result here to avoid affecting the normal path. | |
7211 | */ | |
7212 | if (!(link->head->flags & REQ_F_FAIL)) | |
7213 | req_fail_link_node(link->head, -ECANCELED); | |
7214 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7215 | /* | |
7216 | * the current req is a normal req, we should return | |
7217 | * error and thus break the submittion loop. | |
7218 | */ | |
7219 | io_req_complete_failed(req, ret); | |
7220 | return ret; | |
de59bc10 | 7221 | } |
a8295b98 | 7222 | req_fail_link_node(req, ret); |
a6b8cadc | 7223 | } |
441b8a78 | 7224 | |
be7053b7 | 7225 | /* don't need @sqe from now on */ |
236daeae OL |
7226 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
7227 | req->flags, true, | |
7228 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7229 | |
9e645e11 JA |
7230 | /* |
7231 | * If we already have a head request, queue this one for async | |
7232 | * submittal once the head completes. If we don't have a head but | |
7233 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7234 | * submitted sync once the chain is complete. If none of those | |
7235 | * conditions are true (normal request), then just queue it. | |
7236 | */ | |
863e0560 PB |
7237 | if (link->head) { |
7238 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7239 | |
a8295b98 HX |
7240 | if (!(req->flags & REQ_F_FAIL)) { |
7241 | ret = io_req_prep_async(req); | |
7242 | if (unlikely(ret)) { | |
7243 | req_fail_link_node(req, ret); | |
7244 | if (!(head->flags & REQ_F_FAIL)) | |
7245 | req_fail_link_node(head, -ECANCELED); | |
7246 | } | |
7247 | } | |
9d76377f | 7248 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7249 | link->last->link = req; |
863e0560 | 7250 | link->last = req; |
32fe525b | 7251 | |
f15a3431 PB |
7252 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) |
7253 | return 0; | |
32fe525b | 7254 | /* last request of a link, enqueue the link */ |
f15a3431 PB |
7255 | link->head = NULL; |
7256 | req = head; | |
7257 | } else if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { | |
7258 | link->head = req; | |
7259 | link->last = req; | |
7260 | return 0; | |
9e645e11 | 7261 | } |
2e6e1fde | 7262 | |
f15a3431 | 7263 | io_queue_sqe(req); |
1d4240cc | 7264 | return 0; |
9e645e11 JA |
7265 | } |
7266 | ||
9a56a232 JA |
7267 | /* |
7268 | * Batched submission is done, ensure local IO is flushed out. | |
7269 | */ | |
553deffd | 7270 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 7271 | { |
553deffd PB |
7272 | struct io_submit_state *state = &ctx->submit_state; |
7273 | ||
a1ab7b35 | 7274 | if (state->link.head) |
de59bc10 | 7275 | io_queue_sqe(state->link.head); |
553deffd | 7276 | /* flush only after queuing links as they can generate completions */ |
c450178d | 7277 | io_submit_flush_completions(ctx); |
27926b68 JA |
7278 | if (state->plug_started) |
7279 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7280 | } |
7281 | ||
7282 | /* | |
7283 | * Start submission side cache. | |
7284 | */ | |
7285 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7286 | unsigned int max_ios) |
9a56a232 | 7287 | { |
27926b68 | 7288 | state->plug_started = false; |
4b628aeb | 7289 | state->need_plug = max_ios > 2; |
5ca7a8b3 | 7290 | state->submit_nr = max_ios; |
a1ab7b35 PB |
7291 | /* set only head, no need to init link_last in advance */ |
7292 | state->link.head = NULL; | |
9a56a232 JA |
7293 | } |
7294 | ||
2b188cc1 JA |
7295 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7296 | { | |
75b28aff | 7297 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7298 | |
caf582c6 PB |
7299 | /* |
7300 | * Ensure any loads from the SQEs are done at this point, | |
7301 | * since once we write the new head, the application could | |
7302 | * write new data to them. | |
7303 | */ | |
7304 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7305 | } |
7306 | ||
2b188cc1 | 7307 | /* |
dd9ae8a0 | 7308 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7309 | * that is mapped by userspace. This means that care needs to be taken to |
7310 | * ensure that reads are stable, as we cannot rely on userspace always | |
7311 | * being a good citizen. If members of the sqe are validated and then later | |
7312 | * used, it's important that those reads are done through READ_ONCE() to | |
7313 | * prevent a re-load down the line. | |
7314 | */ | |
709b302f | 7315 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7316 | { |
ea5ab3b5 | 7317 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7318 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7319 | |
7320 | /* | |
7321 | * The cached sq head (or cq tail) serves two purposes: | |
7322 | * | |
7323 | * 1) allows us to batch the cost of updating the user visible | |
7324 | * head updates. | |
7325 | * 2) allows the kernel side to track the head on its own, even | |
7326 | * though the application is the one updating it. | |
7327 | */ | |
17d3aeb3 | 7328 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7329 | if (likely(head < ctx->sq_entries)) |
7330 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7331 | |
7332 | /* drop invalid entries */ | |
15641e42 PB |
7333 | ctx->cq_extra--; |
7334 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7335 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7336 | return NULL; |
7337 | } | |
7338 | ||
0f212204 | 7339 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7340 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7341 | { |
69629809 | 7342 | unsigned int entries = io_sqring_entries(ctx); |
46c4e16a | 7343 | int submitted = 0; |
6c271ce2 | 7344 | |
51d48dab | 7345 | if (unlikely(!entries)) |
69629809 | 7346 | return 0; |
ee7d46d9 | 7347 | /* make sure SQ entry isn't read before tail */ |
69629809 | 7348 | nr = min3(nr, ctx->sq_entries, entries); |
9a10867a | 7349 | io_get_task_refs(nr); |
6c271ce2 | 7350 | |
ba88ff11 | 7351 | io_submit_state_start(&ctx->submit_state, nr); |
69629809 | 7352 | do { |
3529d8c2 | 7353 | const struct io_uring_sqe *sqe; |
196be95c | 7354 | struct io_kiocb *req; |
fb5ccc98 | 7355 | |
a33ae9ce | 7356 | if (unlikely(!io_alloc_req_refill(ctx))) { |
196be95c PB |
7357 | if (!submitted) |
7358 | submitted = -EAGAIN; | |
fb5ccc98 | 7359 | break; |
196be95c | 7360 | } |
a33ae9ce | 7361 | req = io_alloc_req(ctx); |
4fccfcbb PB |
7362 | sqe = io_get_sqe(ctx); |
7363 | if (unlikely(!sqe)) { | |
c2b6c6bc | 7364 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
4fccfcbb PB |
7365 | break; |
7366 | } | |
d3656344 JA |
7367 | /* will complete beyond this point, count as submitted */ |
7368 | submitted++; | |
a1ab7b35 | 7369 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7370 | break; |
69629809 | 7371 | } while (submitted < nr); |
6c271ce2 | 7372 | |
9466f437 PB |
7373 | if (unlikely(submitted != nr)) { |
7374 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7375 | int unused = nr - ref_used; |
9466f437 | 7376 | |
09899b19 | 7377 | current->io_uring->cached_refs += unused; |
9466f437 | 7378 | } |
6c271ce2 | 7379 | |
553deffd | 7380 | io_submit_state_end(ctx); |
ae9428ca PB |
7381 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7382 | io_commit_sqring(ctx); | |
7383 | ||
6c271ce2 JA |
7384 | return submitted; |
7385 | } | |
7386 | ||
e4b6d902 PB |
7387 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7388 | { | |
7389 | return READ_ONCE(sqd->state); | |
7390 | } | |
7391 | ||
23b3628e XW |
7392 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7393 | { | |
7394 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7395 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7396 | WRITE_ONCE(ctx->rings->sq_flags, |
7397 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7398 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7399 | } |
7400 | ||
7401 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7402 | { | |
79ebeaee | 7403 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7404 | WRITE_ONCE(ctx->rings->sq_flags, |
7405 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7406 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7407 | } |
7408 | ||
08369246 | 7409 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7410 | { |
c8d1ba58 | 7411 | unsigned int to_submit; |
bdcd3eab | 7412 | int ret = 0; |
6c271ce2 | 7413 | |
c8d1ba58 | 7414 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7415 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7416 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7417 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7418 | |
5eef4e87 | 7419 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
7420 | const struct cred *creds = NULL; |
7421 | ||
7422 | if (ctx->sq_creds != current_cred()) | |
7423 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7424 | |
c8d1ba58 | 7425 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 7426 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 7427 | io_do_iopoll(ctx, true); |
906a3c6f | 7428 | |
3b763ba1 PB |
7429 | /* |
7430 | * Don't submit if refs are dying, good for io_uring_register(), | |
7431 | * but also it is relied upon by io_ring_exit_work() | |
7432 | */ | |
0298ef96 PB |
7433 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7434 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7435 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7436 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7437 | |
acfb381d PB |
7438 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7439 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7440 | if (creds) |
7441 | revert_creds(creds); | |
acfb381d | 7442 | } |
6c271ce2 | 7443 | |
08369246 XW |
7444 | return ret; |
7445 | } | |
6c271ce2 | 7446 | |
c072481d | 7447 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
7448 | { |
7449 | struct io_ring_ctx *ctx; | |
7450 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7451 | |
c9dca27d PB |
7452 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7453 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7454 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7455 | } |
6c271ce2 | 7456 | |
e4b6d902 PB |
7457 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7458 | { | |
7459 | bool did_sig = false; | |
7460 | struct ksignal ksig; | |
7461 | ||
7462 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7463 | signal_pending(current)) { | |
7464 | mutex_unlock(&sqd->lock); | |
7465 | if (signal_pending(current)) | |
7466 | did_sig = get_signal(&ksig); | |
7467 | cond_resched(); | |
7468 | mutex_lock(&sqd->lock); | |
7469 | } | |
e4b6d902 PB |
7470 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7471 | } | |
7472 | ||
c8d1ba58 JA |
7473 | static int io_sq_thread(void *data) |
7474 | { | |
69fb2131 JA |
7475 | struct io_sq_data *sqd = data; |
7476 | struct io_ring_ctx *ctx; | |
a0d9205f | 7477 | unsigned long timeout = 0; |
37d1e2e3 | 7478 | char buf[TASK_COMM_LEN]; |
08369246 | 7479 | DEFINE_WAIT(wait); |
6c271ce2 | 7480 | |
696ee88a | 7481 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7482 | set_task_comm(current, buf); |
37d1e2e3 JA |
7483 | |
7484 | if (sqd->sq_cpu != -1) | |
7485 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7486 | else | |
7487 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7488 | current->flags |= PF_NO_SETAFFINITY; | |
7489 | ||
5bd2182d PM |
7490 | audit_alloc_kernel(current); |
7491 | ||
09a6f4ef | 7492 | mutex_lock(&sqd->lock); |
e4b6d902 | 7493 | while (1) { |
1a924a80 | 7494 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7495 | |
e4b6d902 PB |
7496 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7497 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7498 | break; |
08369246 XW |
7499 | timeout = jiffies + sqd->sq_thread_idle; |
7500 | } | |
e4b6d902 | 7501 | |
e95eee2d | 7502 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7503 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7504 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7505 | |
5eef4e87 | 7506 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 7507 | sqt_spin = true; |
69fb2131 | 7508 | } |
dd432ea5 PB |
7509 | if (io_run_task_work()) |
7510 | sqt_spin = true; | |
6c271ce2 | 7511 | |
08369246 | 7512 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7513 | cond_resched(); |
08369246 XW |
7514 | if (sqt_spin) |
7515 | timeout = jiffies + sqd->sq_thread_idle; | |
7516 | continue; | |
7517 | } | |
7518 | ||
08369246 | 7519 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7520 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7521 | bool needs_sched = true; |
7522 | ||
724cb4f9 | 7523 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7524 | io_ring_set_wakeup_flag(ctx); |
7525 | ||
724cb4f9 | 7526 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 7527 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
7528 | needs_sched = false; |
7529 | break; | |
7530 | } | |
7531 | if (io_sqring_entries(ctx)) { | |
7532 | needs_sched = false; | |
7533 | break; | |
7534 | } | |
7535 | } | |
7536 | ||
7537 | if (needs_sched) { | |
7538 | mutex_unlock(&sqd->lock); | |
7539 | schedule(); | |
7540 | mutex_lock(&sqd->lock); | |
7541 | } | |
69fb2131 JA |
7542 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7543 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7544 | } |
08369246 XW |
7545 | |
7546 | finish_wait(&sqd->wait, &wait); | |
7547 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7548 | } |
28cea78a | 7549 | |
78cc687b | 7550 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7551 | sqd->thread = NULL; |
05962f95 | 7552 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7553 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7554 | io_run_task_work(); |
734551df PB |
7555 | mutex_unlock(&sqd->lock); |
7556 | ||
5bd2182d PM |
7557 | audit_free(current); |
7558 | ||
37d1e2e3 JA |
7559 | complete(&sqd->exited); |
7560 | do_exit(0); | |
6c271ce2 JA |
7561 | } |
7562 | ||
bda52162 JA |
7563 | struct io_wait_queue { |
7564 | struct wait_queue_entry wq; | |
7565 | struct io_ring_ctx *ctx; | |
5fd46178 | 7566 | unsigned cq_tail; |
bda52162 JA |
7567 | unsigned nr_timeouts; |
7568 | }; | |
7569 | ||
6c503150 | 7570 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7571 | { |
7572 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7573 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7574 | |
7575 | /* | |
d195a66e | 7576 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7577 | * started waiting. For timeouts, we always want to return to userspace, |
7578 | * regardless of event count. | |
7579 | */ | |
5fd46178 | 7580 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7581 | } |
7582 | ||
7583 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7584 | int wake_flags, void *key) | |
7585 | { | |
7586 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7587 | wq); | |
7588 | ||
6c503150 PB |
7589 | /* |
7590 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7591 | * the task, and the next invocation will do it. | |
7592 | */ | |
5ed7a37d | 7593 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7594 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7595 | return -1; | |
bda52162 JA |
7596 | } |
7597 | ||
af9c1a44 JA |
7598 | static int io_run_task_work_sig(void) |
7599 | { | |
7600 | if (io_run_task_work()) | |
7601 | return 1; | |
7602 | if (!signal_pending(current)) | |
7603 | return 0; | |
0b8cfa97 | 7604 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7605 | return -ERESTARTSYS; |
af9c1a44 JA |
7606 | return -EINTR; |
7607 | } | |
7608 | ||
eeb60b9a PB |
7609 | /* when returns >0, the caller should retry */ |
7610 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7611 | struct io_wait_queue *iowq, | |
7612 | signed long *timeout) | |
7613 | { | |
7614 | int ret; | |
7615 | ||
7616 | /* make sure we run task_work before checking for signals */ | |
7617 | ret = io_run_task_work_sig(); | |
7618 | if (ret || io_should_wake(iowq)) | |
7619 | return ret; | |
7620 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7621 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7622 | return 1; |
7623 | ||
7624 | *timeout = schedule_timeout(*timeout); | |
7625 | return !*timeout ? -ETIME : 1; | |
7626 | } | |
7627 | ||
2b188cc1 JA |
7628 | /* |
7629 | * Wait until events become available, if we don't already have some. The | |
7630 | * application must reap them itself, as they reside on the shared cq ring. | |
7631 | */ | |
7632 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7633 | const sigset_t __user *sig, size_t sigsz, |
7634 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7635 | { |
90291099 | 7636 | struct io_wait_queue iowq; |
75b28aff | 7637 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7638 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7639 | int ret; | |
2b188cc1 | 7640 | |
b41e9852 | 7641 | do { |
90f67366 | 7642 | io_cqring_overflow_flush(ctx); |
6c503150 | 7643 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7644 | return 0; |
4c6e277c | 7645 | if (!io_run_task_work()) |
b41e9852 | 7646 | break; |
b41e9852 | 7647 | } while (1); |
2b188cc1 | 7648 | |
44df58d4 XW |
7649 | if (uts) { |
7650 | struct timespec64 ts; | |
7651 | ||
7652 | if (get_timespec64(&ts, uts)) | |
7653 | return -EFAULT; | |
7654 | timeout = timespec64_to_jiffies(&ts); | |
7655 | } | |
7656 | ||
2b188cc1 | 7657 | if (sig) { |
9e75ad5d AB |
7658 | #ifdef CONFIG_COMPAT |
7659 | if (in_compat_syscall()) | |
7660 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7661 | sigsz); |
9e75ad5d AB |
7662 | else |
7663 | #endif | |
b772434b | 7664 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7665 | |
2b188cc1 JA |
7666 | if (ret) |
7667 | return ret; | |
7668 | } | |
7669 | ||
90291099 PB |
7670 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7671 | iowq.wq.private = current; | |
7672 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7673 | iowq.ctx = ctx; | |
bda52162 | 7674 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7675 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7676 | |
c826bd7a | 7677 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7678 | do { |
ca0a2651 | 7679 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7680 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7681 | ret = -EBUSY; |
7682 | break; | |
7683 | } | |
311997b3 | 7684 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7685 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7686 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7687 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7688 | cond_resched(); |
eeb60b9a | 7689 | } while (ret > 0); |
bda52162 | 7690 | |
b7db41c9 | 7691 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7692 | |
75b28aff | 7693 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7694 | } |
7695 | ||
9123c8ff | 7696 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7697 | { |
9123c8ff | 7698 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7699 | |
846a4ef2 | 7700 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7701 | kfree(table[i]); |
7702 | kfree(table); | |
7703 | } | |
7704 | ||
c072481d | 7705 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
7706 | { |
7707 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7708 | size_t init_size = size; | |
7709 | void **table; | |
7710 | ||
0bea96f5 | 7711 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7712 | if (!table) |
7713 | return NULL; | |
7714 | ||
7715 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7716 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7717 | |
0bea96f5 | 7718 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7719 | if (!table[i]) { |
7720 | io_free_page_table(table, init_size); | |
7721 | return NULL; | |
7722 | } | |
7723 | size -= this_size; | |
7724 | } | |
7725 | return table; | |
05f3fb3c JA |
7726 | } |
7727 | ||
28a9fe25 | 7728 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7729 | { |
28a9fe25 PB |
7730 | percpu_ref_exit(&ref_node->refs); |
7731 | kfree(ref_node); | |
1642b445 PB |
7732 | } |
7733 | ||
c072481d | 7734 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
7735 | { |
7736 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7737 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7738 | unsigned long flags; | |
7739 | bool first_add = false; | |
7740 | ||
7741 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7742 | node->done = true; | |
7743 | ||
7744 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7745 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7746 | struct io_rsrc_node, node); | |
7747 | /* recycle ref nodes in order */ | |
7748 | if (!node->done) | |
7749 | break; | |
7750 | list_del(&node->node); | |
7751 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7752 | } | |
7753 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7754 | ||
7755 | if (first_add) | |
7756 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7757 | } | |
7758 | ||
7759 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7760 | { | |
7761 | struct io_rsrc_node *ref_node; | |
7762 | ||
7763 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7764 | if (!ref_node) | |
7765 | return NULL; | |
7766 | ||
7767 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7768 | 0, GFP_KERNEL)) { | |
7769 | kfree(ref_node); | |
7770 | return NULL; | |
7771 | } | |
7772 | INIT_LIST_HEAD(&ref_node->node); | |
7773 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7774 | ref_node->done = false; | |
7775 | return ref_node; | |
7776 | } | |
7777 | ||
a7f0ed5a PB |
7778 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7779 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 7780 | __must_hold(&ctx->uring_lock) |
6b06314c | 7781 | { |
a7f0ed5a PB |
7782 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7783 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7784 | |
ab409402 PB |
7785 | io_rsrc_refs_drop(ctx); |
7786 | ||
a7f0ed5a PB |
7787 | if (data_to_kill) { |
7788 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7789 | |
a7f0ed5a | 7790 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7791 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7792 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7793 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7794 | |
3e942498 | 7795 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7796 | percpu_ref_kill(&rsrc_node->refs); |
7797 | ctx->rsrc_node = NULL; | |
7798 | } | |
6b06314c | 7799 | |
a7f0ed5a PB |
7800 | if (!ctx->rsrc_node) { |
7801 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7802 | ctx->rsrc_backup_node = NULL; | |
7803 | } | |
8bad28d8 HX |
7804 | } |
7805 | ||
a7f0ed5a | 7806 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7807 | { |
7808 | if (ctx->rsrc_backup_node) | |
7809 | return 0; | |
b895c9a6 | 7810 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7811 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7812 | } |
7813 | ||
c072481d PB |
7814 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
7815 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
7816 | { |
7817 | int ret; | |
05589553 | 7818 | |
215c3902 | 7819 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7820 | if (data->quiesce) |
7821 | return -ENXIO; | |
05589553 | 7822 | |
8bad28d8 | 7823 | data->quiesce = true; |
1ffc5422 | 7824 | do { |
a7f0ed5a | 7825 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7826 | if (ret) |
f2303b1f | 7827 | break; |
a7f0ed5a | 7828 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7829 | |
3e942498 PB |
7830 | /* kill initial ref, already quiesced if zero */ |
7831 | if (atomic_dec_and_test(&data->refs)) | |
7832 | break; | |
c018db4a | 7833 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7834 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7835 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7836 | if (!ret) { |
7837 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7838 | break; |
c018db4a | 7839 | } |
8bad28d8 | 7840 | |
3e942498 PB |
7841 | atomic_inc(&data->refs); |
7842 | /* wait for all works potentially completing data->done */ | |
7843 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7844 | reinit_completion(&data->done); |
8dd03afe | 7845 | |
1ffc5422 | 7846 | ret = io_run_task_work_sig(); |
8bad28d8 | 7847 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7848 | } while (ret >= 0); |
8bad28d8 | 7849 | data->quiesce = false; |
05f3fb3c | 7850 | |
8bad28d8 | 7851 | return ret; |
d7954b2b BM |
7852 | } |
7853 | ||
2d091d62 PB |
7854 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7855 | { | |
7856 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7857 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7858 | ||
7859 | return &data->tags[table_idx][off]; | |
7860 | } | |
7861 | ||
44b31f2f | 7862 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7863 | { |
2d091d62 PB |
7864 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7865 | ||
7866 | if (data->tags) | |
7867 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7868 | kfree(data); |
7869 | } | |
7870 | ||
c072481d PB |
7871 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7872 | u64 __user *utags, unsigned nr, | |
7873 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7874 | { |
b895c9a6 | 7875 | struct io_rsrc_data *data; |
2d091d62 | 7876 | int ret = -ENOMEM; |
d878c816 | 7877 | unsigned i; |
1ad555c6 BM |
7878 | |
7879 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7880 | if (!data) | |
d878c816 | 7881 | return -ENOMEM; |
2d091d62 | 7882 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7883 | if (!data->tags) { |
1ad555c6 | 7884 | kfree(data); |
d878c816 PB |
7885 | return -ENOMEM; |
7886 | } | |
2d091d62 PB |
7887 | |
7888 | data->nr = nr; | |
7889 | data->ctx = ctx; | |
7890 | data->do_put = do_put; | |
d878c816 | 7891 | if (utags) { |
2d091d62 | 7892 | ret = -EFAULT; |
d878c816 | 7893 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7894 | u64 *tag_slot = io_get_tag_slot(data, i); |
7895 | ||
7896 | if (copy_from_user(tag_slot, &utags[i], | |
7897 | sizeof(*tag_slot))) | |
2d091d62 | 7898 | goto fail; |
d878c816 | 7899 | } |
1ad555c6 | 7900 | } |
b60c8dce | 7901 | |
3e942498 | 7902 | atomic_set(&data->refs, 1); |
1ad555c6 | 7903 | init_completion(&data->done); |
d878c816 PB |
7904 | *pdata = data; |
7905 | return 0; | |
2d091d62 PB |
7906 | fail: |
7907 | io_rsrc_data_free(data); | |
7908 | return ret; | |
1ad555c6 BM |
7909 | } |
7910 | ||
9123c8ff PB |
7911 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7912 | { | |
0bea96f5 PB |
7913 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7914 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7915 | return !!table->files; |
7916 | } | |
7917 | ||
042b0d85 | 7918 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7919 | { |
042b0d85 | 7920 | kvfree(table->files); |
9123c8ff PB |
7921 | table->files = NULL; |
7922 | } | |
7923 | ||
fff4db76 | 7924 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7925 | { |
fff4db76 PB |
7926 | #if defined(CONFIG_UNIX) |
7927 | if (ctx->ring_sock) { | |
7928 | struct sock *sock = ctx->ring_sock->sk; | |
7929 | struct sk_buff *skb; | |
7930 | ||
7931 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7932 | kfree_skb(skb); | |
7933 | } | |
7934 | #else | |
7935 | int i; | |
7936 | ||
7937 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7938 | struct file *file; | |
7939 | ||
7940 | file = io_file_from_index(ctx, i); | |
7941 | if (file) | |
7942 | fput(file); | |
7943 | } | |
7944 | #endif | |
042b0d85 | 7945 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7946 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7947 | ctx->file_data = NULL; |
7948 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7949 | } |
7950 | ||
d7954b2b BM |
7951 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7952 | { | |
d7954b2b BM |
7953 | int ret; |
7954 | ||
08480400 | 7955 | if (!ctx->file_data) |
d7954b2b | 7956 | return -ENXIO; |
08480400 PB |
7957 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7958 | if (!ret) | |
7959 | __io_sqe_files_unregister(ctx); | |
7960 | return ret; | |
6b06314c JA |
7961 | } |
7962 | ||
37d1e2e3 | 7963 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7964 | __releases(&sqd->lock) |
37d1e2e3 | 7965 | { |
521d6a73 PB |
7966 | WARN_ON_ONCE(sqd->thread == current); |
7967 | ||
9e138a48 PB |
7968 | /* |
7969 | * Do the dance but not conditional clear_bit() because it'd race with | |
7970 | * other threads incrementing park_pending and setting the bit. | |
7971 | */ | |
37d1e2e3 | 7972 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7973 | if (atomic_dec_return(&sqd->park_pending)) |
7974 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7975 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7976 | } |
7977 | ||
86e0d676 | 7978 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7979 | __acquires(&sqd->lock) |
37d1e2e3 | 7980 | { |
521d6a73 PB |
7981 | WARN_ON_ONCE(sqd->thread == current); |
7982 | ||
9e138a48 | 7983 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7984 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7985 | mutex_lock(&sqd->lock); |
05962f95 | 7986 | if (sqd->thread) |
86e0d676 | 7987 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7988 | } |
7989 | ||
7990 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7991 | { | |
521d6a73 | 7992 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7993 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7994 | |
05962f95 | 7995 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7996 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7997 | if (sqd->thread) |
7998 | wake_up_process(sqd->thread); | |
09a6f4ef | 7999 | mutex_unlock(&sqd->lock); |
05962f95 | 8000 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
8001 | } |
8002 | ||
534ca6d6 | 8003 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 8004 | { |
534ca6d6 | 8005 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
8006 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
8007 | ||
37d1e2e3 JA |
8008 | io_sq_thread_stop(sqd); |
8009 | kfree(sqd); | |
8010 | } | |
8011 | } | |
8012 | ||
8013 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
8014 | { | |
8015 | struct io_sq_data *sqd = ctx->sq_data; | |
8016 | ||
8017 | if (sqd) { | |
05962f95 | 8018 | io_sq_thread_park(sqd); |
521d6a73 | 8019 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 8020 | io_sqd_update_thread_idle(sqd); |
05962f95 | 8021 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
8022 | |
8023 | io_put_sq_data(sqd); | |
8024 | ctx->sq_data = NULL; | |
534ca6d6 JA |
8025 | } |
8026 | } | |
8027 | ||
aa06165d JA |
8028 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
8029 | { | |
8030 | struct io_ring_ctx *ctx_attach; | |
8031 | struct io_sq_data *sqd; | |
8032 | struct fd f; | |
8033 | ||
8034 | f = fdget(p->wq_fd); | |
8035 | if (!f.file) | |
8036 | return ERR_PTR(-ENXIO); | |
8037 | if (f.file->f_op != &io_uring_fops) { | |
8038 | fdput(f); | |
8039 | return ERR_PTR(-EINVAL); | |
8040 | } | |
8041 | ||
8042 | ctx_attach = f.file->private_data; | |
8043 | sqd = ctx_attach->sq_data; | |
8044 | if (!sqd) { | |
8045 | fdput(f); | |
8046 | return ERR_PTR(-EINVAL); | |
8047 | } | |
5c2469e0 JA |
8048 | if (sqd->task_tgid != current->tgid) { |
8049 | fdput(f); | |
8050 | return ERR_PTR(-EPERM); | |
8051 | } | |
aa06165d JA |
8052 | |
8053 | refcount_inc(&sqd->refs); | |
8054 | fdput(f); | |
8055 | return sqd; | |
8056 | } | |
8057 | ||
26984fbf PB |
8058 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
8059 | bool *attached) | |
534ca6d6 JA |
8060 | { |
8061 | struct io_sq_data *sqd; | |
8062 | ||
26984fbf | 8063 | *attached = false; |
5c2469e0 JA |
8064 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
8065 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
8066 | if (!IS_ERR(sqd)) { |
8067 | *attached = true; | |
5c2469e0 | 8068 | return sqd; |
26984fbf | 8069 | } |
5c2469e0 JA |
8070 | /* fall through for EPERM case, setup new sqd/task */ |
8071 | if (PTR_ERR(sqd) != -EPERM) | |
8072 | return sqd; | |
8073 | } | |
aa06165d | 8074 | |
534ca6d6 JA |
8075 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
8076 | if (!sqd) | |
8077 | return ERR_PTR(-ENOMEM); | |
8078 | ||
9e138a48 | 8079 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 8080 | refcount_set(&sqd->refs, 1); |
69fb2131 | 8081 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 8082 | mutex_init(&sqd->lock); |
534ca6d6 | 8083 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 8084 | init_completion(&sqd->exited); |
534ca6d6 JA |
8085 | return sqd; |
8086 | } | |
8087 | ||
6b06314c | 8088 | #if defined(CONFIG_UNIX) |
6b06314c JA |
8089 | /* |
8090 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
8091 | * the io_uring can be safely unregistered on process exit, even if we have | |
8092 | * loops in the file referencing. | |
8093 | */ | |
8094 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
8095 | { | |
8096 | struct sock *sk = ctx->ring_sock->sk; | |
8097 | struct scm_fp_list *fpl; | |
8098 | struct sk_buff *skb; | |
08a45173 | 8099 | int i, nr_files; |
6b06314c | 8100 | |
6b06314c JA |
8101 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
8102 | if (!fpl) | |
8103 | return -ENOMEM; | |
8104 | ||
8105 | skb = alloc_skb(0, GFP_KERNEL); | |
8106 | if (!skb) { | |
8107 | kfree(fpl); | |
8108 | return -ENOMEM; | |
8109 | } | |
8110 | ||
8111 | skb->sk = sk; | |
6b06314c | 8112 | |
08a45173 | 8113 | nr_files = 0; |
62e398be | 8114 | fpl->user = get_uid(current_user()); |
6b06314c | 8115 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
8116 | struct file *file = io_file_from_index(ctx, i + offset); |
8117 | ||
8118 | if (!file) | |
08a45173 | 8119 | continue; |
65e19f54 | 8120 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
8121 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
8122 | nr_files++; | |
6b06314c JA |
8123 | } |
8124 | ||
08a45173 JA |
8125 | if (nr_files) { |
8126 | fpl->max = SCM_MAX_FD; | |
8127 | fpl->count = nr_files; | |
8128 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 8129 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
8130 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
8131 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8132 | |
08a45173 JA |
8133 | for (i = 0; i < nr_files; i++) |
8134 | fput(fpl->fp[i]); | |
8135 | } else { | |
8136 | kfree_skb(skb); | |
8137 | kfree(fpl); | |
8138 | } | |
6b06314c JA |
8139 | |
8140 | return 0; | |
8141 | } | |
8142 | ||
8143 | /* | |
8144 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8145 | * causes regular reference counting to break down. We rely on the UNIX | |
8146 | * garbage collection to take care of this problem for us. | |
8147 | */ | |
8148 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8149 | { | |
8150 | unsigned left, total; | |
8151 | int ret = 0; | |
8152 | ||
8153 | total = 0; | |
8154 | left = ctx->nr_user_files; | |
8155 | while (left) { | |
8156 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8157 | |
8158 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8159 | if (ret) | |
8160 | break; | |
8161 | left -= this_files; | |
8162 | total += this_files; | |
8163 | } | |
8164 | ||
8165 | if (!ret) | |
8166 | return 0; | |
8167 | ||
8168 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8169 | struct file *file = io_file_from_index(ctx, total); |
8170 | ||
8171 | if (file) | |
8172 | fput(file); | |
6b06314c JA |
8173 | total++; |
8174 | } | |
8175 | ||
8176 | return ret; | |
8177 | } | |
8178 | #else | |
8179 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8180 | { | |
8181 | return 0; | |
8182 | } | |
8183 | #endif | |
8184 | ||
47e90392 | 8185 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8186 | { |
50238531 | 8187 | struct file *file = prsrc->file; |
05f3fb3c JA |
8188 | #if defined(CONFIG_UNIX) |
8189 | struct sock *sock = ctx->ring_sock->sk; | |
8190 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8191 | struct sk_buff *skb; | |
8192 | int i; | |
8193 | ||
8194 | __skb_queue_head_init(&list); | |
8195 | ||
8196 | /* | |
8197 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8198 | * remove this entry and rearrange the file array. | |
8199 | */ | |
8200 | skb = skb_dequeue(head); | |
8201 | while (skb) { | |
8202 | struct scm_fp_list *fp; | |
8203 | ||
8204 | fp = UNIXCB(skb).fp; | |
8205 | for (i = 0; i < fp->count; i++) { | |
8206 | int left; | |
8207 | ||
8208 | if (fp->fp[i] != file) | |
8209 | continue; | |
8210 | ||
8211 | unix_notinflight(fp->user, fp->fp[i]); | |
8212 | left = fp->count - 1 - i; | |
8213 | if (left) { | |
8214 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8215 | left * sizeof(struct file *)); | |
8216 | } | |
8217 | fp->count--; | |
8218 | if (!fp->count) { | |
8219 | kfree_skb(skb); | |
8220 | skb = NULL; | |
8221 | } else { | |
8222 | __skb_queue_tail(&list, skb); | |
8223 | } | |
8224 | fput(file); | |
8225 | file = NULL; | |
8226 | break; | |
8227 | } | |
8228 | ||
8229 | if (!file) | |
8230 | break; | |
8231 | ||
8232 | __skb_queue_tail(&list, skb); | |
8233 | ||
8234 | skb = skb_dequeue(head); | |
8235 | } | |
8236 | ||
8237 | if (skb_peek(&list)) { | |
8238 | spin_lock_irq(&head->lock); | |
8239 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8240 | __skb_queue_tail(head, skb); | |
8241 | spin_unlock_irq(&head->lock); | |
8242 | } | |
8243 | #else | |
8244 | fput(file); | |
8245 | #endif | |
8246 | } | |
8247 | ||
b895c9a6 | 8248 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8249 | { |
b895c9a6 | 8250 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8251 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8252 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8253 | |
269bbe5f BM |
8254 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8255 | list_del(&prsrc->list); | |
b60c8dce PB |
8256 | |
8257 | if (prsrc->tag) { | |
8258 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8259 | |
8260 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8261 | spin_lock(&ctx->completion_lock); |
b60c8dce | 8262 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 8263 | ctx->cq_extra++; |
b60c8dce | 8264 | io_commit_cqring(ctx); |
79ebeaee | 8265 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8266 | io_cqring_ev_posted(ctx); |
8267 | io_ring_submit_unlock(ctx, lock_ring); | |
8268 | } | |
8269 | ||
40ae0ff7 | 8270 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8271 | kfree(prsrc); |
65e19f54 | 8272 | } |
05589553 | 8273 | |
28a9fe25 | 8274 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8275 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8276 | complete(&rsrc_data->done); | |
2faf852d | 8277 | } |
65e19f54 | 8278 | |
269bbe5f | 8279 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8280 | { |
8281 | struct io_ring_ctx *ctx; | |
8282 | struct llist_node *node; | |
8283 | ||
269bbe5f BM |
8284 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8285 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8286 | |
8287 | while (node) { | |
b895c9a6 | 8288 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8289 | struct llist_node *next = node->next; |
8290 | ||
b895c9a6 | 8291 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8292 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8293 | node = next; |
8294 | } | |
8295 | } | |
8296 | ||
6b06314c | 8297 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8298 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8299 | { |
8300 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8301 | struct file *file; |
f3baed39 | 8302 | int fd, ret; |
846a4ef2 | 8303 | unsigned i; |
6b06314c | 8304 | |
05f3fb3c | 8305 | if (ctx->file_data) |
6b06314c JA |
8306 | return -EBUSY; |
8307 | if (!nr_args) | |
8308 | return -EINVAL; | |
8309 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8310 | return -EMFILE; | |
3a1b8a4e PB |
8311 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8312 | return -EMFILE; | |
a7f0ed5a | 8313 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8314 | if (ret) |
8315 | return ret; | |
d878c816 PB |
8316 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8317 | &ctx->file_data); | |
8318 | if (ret) | |
8319 | return ret; | |
6b06314c | 8320 | |
f3baed39 | 8321 | ret = -ENOMEM; |
aeca241b | 8322 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8323 | goto out_free; |
65e19f54 | 8324 | |
08a45173 | 8325 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8326 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8327 | ret = -EFAULT; |
8328 | goto out_fput; | |
8329 | } | |
08a45173 | 8330 | /* allow sparse sets */ |
792e3582 PB |
8331 | if (fd == -1) { |
8332 | ret = -EINVAL; | |
2d091d62 | 8333 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8334 | goto out_fput; |
08a45173 | 8335 | continue; |
792e3582 | 8336 | } |
6b06314c | 8337 | |
05f3fb3c | 8338 | file = fget(fd); |
6b06314c | 8339 | ret = -EBADF; |
792e3582 | 8340 | if (unlikely(!file)) |
600cf3f8 | 8341 | goto out_fput; |
05f3fb3c | 8342 | |
6b06314c JA |
8343 | /* |
8344 | * Don't allow io_uring instances to be registered. If UNIX | |
8345 | * isn't enabled, then this causes a reference cycle and this | |
8346 | * instance can never get freed. If UNIX is enabled we'll | |
8347 | * handle it just fine, but there's still no point in allowing | |
8348 | * a ring fd as it doesn't support regular read/write anyway. | |
8349 | */ | |
05f3fb3c JA |
8350 | if (file->f_op == &io_uring_fops) { |
8351 | fput(file); | |
600cf3f8 | 8352 | goto out_fput; |
6b06314c | 8353 | } |
aeca241b | 8354 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8355 | } |
8356 | ||
6b06314c | 8357 | ret = io_sqe_files_scm(ctx); |
05589553 | 8358 | if (ret) { |
08480400 | 8359 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8360 | return ret; |
8361 | } | |
6b06314c | 8362 | |
a7f0ed5a | 8363 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8364 | return ret; |
600cf3f8 PB |
8365 | out_fput: |
8366 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8367 | file = io_file_from_index(ctx, i); | |
8368 | if (file) | |
8369 | fput(file); | |
8370 | } | |
042b0d85 | 8371 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8372 | ctx->nr_user_files = 0; |
600cf3f8 | 8373 | out_free: |
44b31f2f | 8374 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8375 | ctx->file_data = NULL; |
6b06314c JA |
8376 | return ret; |
8377 | } | |
8378 | ||
c3a31e60 JA |
8379 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8380 | int index) | |
8381 | { | |
8382 | #if defined(CONFIG_UNIX) | |
8383 | struct sock *sock = ctx->ring_sock->sk; | |
8384 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8385 | struct sk_buff *skb; | |
8386 | ||
8387 | /* | |
8388 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8389 | * file set. If there's no room, fall back to allocating a new skb | |
8390 | * and filling it in. | |
8391 | */ | |
8392 | spin_lock_irq(&head->lock); | |
8393 | skb = skb_peek(head); | |
8394 | if (skb) { | |
8395 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8396 | ||
8397 | if (fpl->count < SCM_MAX_FD) { | |
8398 | __skb_unlink(skb, head); | |
8399 | spin_unlock_irq(&head->lock); | |
8400 | fpl->fp[fpl->count] = get_file(file); | |
8401 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8402 | fpl->count++; | |
8403 | spin_lock_irq(&head->lock); | |
8404 | __skb_queue_head(head, skb); | |
8405 | } else { | |
8406 | skb = NULL; | |
8407 | } | |
8408 | } | |
8409 | spin_unlock_irq(&head->lock); | |
8410 | ||
8411 | if (skb) { | |
8412 | fput(file); | |
8413 | return 0; | |
8414 | } | |
8415 | ||
8416 | return __io_sqe_files_scm(ctx, 1, index); | |
8417 | #else | |
8418 | return 0; | |
8419 | #endif | |
8420 | } | |
8421 | ||
9c7b0ba8 PB |
8422 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8423 | struct io_rsrc_node *node, void *rsrc) | |
8424 | { | |
8425 | struct io_rsrc_put *prsrc; | |
8426 | ||
8427 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8428 | if (!prsrc) | |
8429 | return -ENOMEM; | |
8430 | ||
8431 | prsrc->tag = *io_get_tag_slot(data, idx); | |
8432 | prsrc->rsrc = rsrc; | |
8433 | list_add(&prsrc->list, &node->rsrc_list); | |
8434 | return 0; | |
8435 | } | |
8436 | ||
b9445598 PB |
8437 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8438 | unsigned int issue_flags, u32 slot_index) | |
8439 | { | |
8440 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 8441 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
9c7b0ba8 | 8442 | bool needs_switch = false; |
b9445598 PB |
8443 | struct io_fixed_file *file_slot; |
8444 | int ret = -EBADF; | |
8445 | ||
3b44b371 | 8446 | io_ring_submit_lock(ctx, needs_lock); |
b9445598 PB |
8447 | if (file->f_op == &io_uring_fops) |
8448 | goto err; | |
8449 | ret = -ENXIO; | |
8450 | if (!ctx->file_data) | |
8451 | goto err; | |
8452 | ret = -EINVAL; | |
8453 | if (slot_index >= ctx->nr_user_files) | |
8454 | goto err; | |
8455 | ||
8456 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8457 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8458 | |
8459 | if (file_slot->file_ptr) { | |
8460 | struct file *old_file; | |
8461 | ||
8462 | ret = io_rsrc_node_switch_start(ctx); | |
8463 | if (ret) | |
8464 | goto err; | |
8465 | ||
8466 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8467 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8468 | ctx->rsrc_node, old_file); | |
8469 | if (ret) | |
8470 | goto err; | |
8471 | file_slot->file_ptr = 0; | |
8472 | needs_switch = true; | |
8473 | } | |
b9445598 PB |
8474 | |
8475 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8476 | io_fixed_file_set(file_slot, file); | |
8477 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8478 | if (ret) { | |
8479 | file_slot->file_ptr = 0; | |
8480 | goto err; | |
8481 | } | |
8482 | ||
8483 | ret = 0; | |
8484 | err: | |
9c7b0ba8 PB |
8485 | if (needs_switch) |
8486 | io_rsrc_node_switch(ctx, ctx->file_data); | |
3b44b371 | 8487 | io_ring_submit_unlock(ctx, needs_lock); |
b9445598 PB |
8488 | if (ret) |
8489 | fput(file); | |
8490 | return ret; | |
8491 | } | |
8492 | ||
7df778be PB |
8493 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
8494 | { | |
8495 | unsigned int offset = req->close.file_slot - 1; | |
8496 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 8497 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
7df778be PB |
8498 | struct io_fixed_file *file_slot; |
8499 | struct file *file; | |
8500 | int ret, i; | |
8501 | ||
3b44b371 | 8502 | io_ring_submit_lock(ctx, needs_lock); |
7df778be PB |
8503 | ret = -ENXIO; |
8504 | if (unlikely(!ctx->file_data)) | |
8505 | goto out; | |
8506 | ret = -EINVAL; | |
8507 | if (offset >= ctx->nr_user_files) | |
8508 | goto out; | |
8509 | ret = io_rsrc_node_switch_start(ctx); | |
8510 | if (ret) | |
8511 | goto out; | |
8512 | ||
8513 | i = array_index_nospec(offset, ctx->nr_user_files); | |
8514 | file_slot = io_fixed_file_slot(&ctx->file_table, i); | |
8515 | ret = -EBADF; | |
8516 | if (!file_slot->file_ptr) | |
8517 | goto out; | |
8518 | ||
8519 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8520 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
8521 | if (ret) | |
8522 | goto out; | |
8523 | ||
8524 | file_slot->file_ptr = 0; | |
8525 | io_rsrc_node_switch(ctx, ctx->file_data); | |
8526 | ret = 0; | |
8527 | out: | |
3b44b371 | 8528 | io_ring_submit_unlock(ctx, needs_lock); |
7df778be PB |
8529 | return ret; |
8530 | } | |
8531 | ||
05f3fb3c | 8532 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 8533 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8534 | unsigned nr_args) |
8535 | { | |
c3bdad02 | 8536 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8537 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8538 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8539 | struct io_fixed_file *file_slot; |
8540 | struct file *file; | |
98f0b3b4 PB |
8541 | int fd, i, err = 0; |
8542 | unsigned int done; | |
05589553 | 8543 | bool needs_switch = false; |
c3a31e60 | 8544 | |
98f0b3b4 PB |
8545 | if (!ctx->file_data) |
8546 | return -ENXIO; | |
8547 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8548 | return -EINVAL; |
8549 | ||
67973b93 | 8550 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8551 | u64 tag = 0; |
8552 | ||
8553 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8554 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8555 | err = -EFAULT; |
8556 | break; | |
8557 | } | |
c3bdad02 PB |
8558 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8559 | err = -EINVAL; | |
8560 | break; | |
8561 | } | |
4e0377a1 | 8562 | if (fd == IORING_REGISTER_FILES_SKIP) |
8563 | continue; | |
8564 | ||
67973b93 | 8565 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8566 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8567 | |
a04b0ac0 PB |
8568 | if (file_slot->file_ptr) { |
8569 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8570 | err = io_queue_rsrc_removal(data, up->offset + done, |
8571 | ctx->rsrc_node, file); | |
a5318d3c HD |
8572 | if (err) |
8573 | break; | |
a04b0ac0 | 8574 | file_slot->file_ptr = 0; |
05589553 | 8575 | needs_switch = true; |
c3a31e60 JA |
8576 | } |
8577 | if (fd != -1) { | |
c3a31e60 JA |
8578 | file = fget(fd); |
8579 | if (!file) { | |
8580 | err = -EBADF; | |
8581 | break; | |
8582 | } | |
8583 | /* | |
8584 | * Don't allow io_uring instances to be registered. If | |
8585 | * UNIX isn't enabled, then this causes a reference | |
8586 | * cycle and this instance can never get freed. If UNIX | |
8587 | * is enabled we'll handle it just fine, but there's | |
8588 | * still no point in allowing a ring fd as it doesn't | |
8589 | * support regular read/write anyway. | |
8590 | */ | |
8591 | if (file->f_op == &io_uring_fops) { | |
8592 | fput(file); | |
8593 | err = -EBADF; | |
8594 | break; | |
8595 | } | |
2d091d62 | 8596 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8597 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8598 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8599 | if (err) { |
a04b0ac0 | 8600 | file_slot->file_ptr = 0; |
f3bd9dae | 8601 | fput(file); |
c3a31e60 | 8602 | break; |
f3bd9dae | 8603 | } |
c3a31e60 | 8604 | } |
05f3fb3c JA |
8605 | } |
8606 | ||
a7f0ed5a PB |
8607 | if (needs_switch) |
8608 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8609 | return done ? done : err; |
8610 | } | |
05589553 | 8611 | |
685fe7fe JA |
8612 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8613 | struct task_struct *task) | |
24369c2e | 8614 | { |
e941894e | 8615 | struct io_wq_hash *hash; |
24369c2e | 8616 | struct io_wq_data data; |
24369c2e | 8617 | unsigned int concurrency; |
24369c2e | 8618 | |
362a9e65 | 8619 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8620 | hash = ctx->hash_map; |
8621 | if (!hash) { | |
8622 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8623 | if (!hash) { |
8624 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8625 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8626 | } |
e941894e JA |
8627 | refcount_set(&hash->refs, 1); |
8628 | init_waitqueue_head(&hash->wait); | |
8629 | ctx->hash_map = hash; | |
24369c2e | 8630 | } |
362a9e65 | 8631 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8632 | |
e941894e | 8633 | data.hash = hash; |
685fe7fe | 8634 | data.task = task; |
ebc11b6c | 8635 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8636 | data.do_work = io_wq_submit_work; |
24369c2e | 8637 | |
d25e3a3d JA |
8638 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8639 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8640 | |
5aa75ed5 | 8641 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8642 | } |
8643 | ||
c072481d PB |
8644 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
8645 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8646 | { |
8647 | struct io_uring_task *tctx; | |
d8a6df10 | 8648 | int ret; |
0f212204 | 8649 | |
09899b19 | 8650 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8651 | if (unlikely(!tctx)) |
8652 | return -ENOMEM; | |
8653 | ||
d8a6df10 JA |
8654 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8655 | if (unlikely(ret)) { | |
8656 | kfree(tctx); | |
8657 | return ret; | |
8658 | } | |
8659 | ||
685fe7fe | 8660 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8661 | if (IS_ERR(tctx->io_wq)) { |
8662 | ret = PTR_ERR(tctx->io_wq); | |
8663 | percpu_counter_destroy(&tctx->inflight); | |
8664 | kfree(tctx); | |
8665 | return ret; | |
8666 | } | |
8667 | ||
0f212204 JA |
8668 | xa_init(&tctx->xa); |
8669 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8670 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8671 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8672 | task->io_uring = tctx; |
7cbf1722 JA |
8673 | spin_lock_init(&tctx->task_lock); |
8674 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8675 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8676 | return 0; |
8677 | } | |
8678 | ||
8679 | void __io_uring_free(struct task_struct *tsk) | |
8680 | { | |
8681 | struct io_uring_task *tctx = tsk->io_uring; | |
8682 | ||
8683 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8684 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8685 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8686 | |
d8a6df10 | 8687 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8688 | kfree(tctx); |
8689 | tsk->io_uring = NULL; | |
8690 | } | |
8691 | ||
c072481d PB |
8692 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
8693 | struct io_uring_params *p) | |
2b188cc1 JA |
8694 | { |
8695 | int ret; | |
8696 | ||
d25e3a3d JA |
8697 | /* Retain compatibility with failing for an invalid attach attempt */ |
8698 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8699 | IORING_SETUP_ATTACH_WQ) { | |
8700 | struct fd f; | |
8701 | ||
8702 | f = fdget(p->wq_fd); | |
8703 | if (!f.file) | |
8704 | return -ENXIO; | |
0cc936f7 JA |
8705 | if (f.file->f_op != &io_uring_fops) { |
8706 | fdput(f); | |
f2a48dd0 | 8707 | return -EINVAL; |
0cc936f7 JA |
8708 | } |
8709 | fdput(f); | |
d25e3a3d | 8710 | } |
6c271ce2 | 8711 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8712 | struct task_struct *tsk; |
534ca6d6 | 8713 | struct io_sq_data *sqd; |
26984fbf | 8714 | bool attached; |
534ca6d6 | 8715 | |
cdc1404a PM |
8716 | ret = security_uring_sqpoll(); |
8717 | if (ret) | |
8718 | return ret; | |
8719 | ||
26984fbf | 8720 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8721 | if (IS_ERR(sqd)) { |
8722 | ret = PTR_ERR(sqd); | |
8723 | goto err; | |
8724 | } | |
69fb2131 | 8725 | |
7c30f36a | 8726 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8727 | ctx->sq_data = sqd; |
917257da JA |
8728 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8729 | if (!ctx->sq_thread_idle) | |
8730 | ctx->sq_thread_idle = HZ; | |
8731 | ||
78d7f6ba | 8732 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8733 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8734 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8735 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8736 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8737 | io_sq_thread_unpark(sqd); |
8738 | ||
de75a3d3 PB |
8739 | if (ret < 0) |
8740 | goto err; | |
8741 | if (attached) | |
5aa75ed5 | 8742 | return 0; |
aa06165d | 8743 | |
6c271ce2 | 8744 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8745 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8746 | |
917257da | 8747 | ret = -EINVAL; |
f2a48dd0 | 8748 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8749 | goto err_sqpoll; |
37d1e2e3 | 8750 | sqd->sq_cpu = cpu; |
6c271ce2 | 8751 | } else { |
37d1e2e3 | 8752 | sqd->sq_cpu = -1; |
6c271ce2 | 8753 | } |
37d1e2e3 JA |
8754 | |
8755 | sqd->task_pid = current->pid; | |
5c2469e0 | 8756 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8757 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8758 | if (IS_ERR(tsk)) { | |
8759 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8760 | goto err_sqpoll; |
6c271ce2 | 8761 | } |
97a73a0f | 8762 | |
46fe18b1 | 8763 | sqd->thread = tsk; |
97a73a0f | 8764 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8765 | wake_up_new_task(tsk); |
0f212204 JA |
8766 | if (ret) |
8767 | goto err; | |
6c271ce2 JA |
8768 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8769 | /* Can't have SQ_AFF without SQPOLL */ | |
8770 | ret = -EINVAL; | |
8771 | goto err; | |
8772 | } | |
8773 | ||
2b188cc1 | 8774 | return 0; |
f2a48dd0 PB |
8775 | err_sqpoll: |
8776 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8777 | err: |
37d1e2e3 | 8778 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8779 | return ret; |
8780 | } | |
8781 | ||
a087e2b5 BM |
8782 | static inline void __io_unaccount_mem(struct user_struct *user, |
8783 | unsigned long nr_pages) | |
2b188cc1 JA |
8784 | { |
8785 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8786 | } | |
8787 | ||
a087e2b5 BM |
8788 | static inline int __io_account_mem(struct user_struct *user, |
8789 | unsigned long nr_pages) | |
2b188cc1 JA |
8790 | { |
8791 | unsigned long page_limit, cur_pages, new_pages; | |
8792 | ||
8793 | /* Don't allow more pages than we can safely lock */ | |
8794 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8795 | ||
8796 | do { | |
8797 | cur_pages = atomic_long_read(&user->locked_vm); | |
8798 | new_pages = cur_pages + nr_pages; | |
8799 | if (new_pages > page_limit) | |
8800 | return -ENOMEM; | |
8801 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8802 | new_pages) != cur_pages); | |
8803 | ||
8804 | return 0; | |
8805 | } | |
8806 | ||
26bfa89e | 8807 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8808 | { |
62e398be | 8809 | if (ctx->user) |
a087e2b5 | 8810 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8811 | |
26bfa89e JA |
8812 | if (ctx->mm_account) |
8813 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8814 | } |
8815 | ||
26bfa89e | 8816 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8817 | { |
30975825 BM |
8818 | int ret; |
8819 | ||
62e398be | 8820 | if (ctx->user) { |
30975825 BM |
8821 | ret = __io_account_mem(ctx->user, nr_pages); |
8822 | if (ret) | |
8823 | return ret; | |
8824 | } | |
8825 | ||
26bfa89e JA |
8826 | if (ctx->mm_account) |
8827 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8828 | |
8829 | return 0; | |
8830 | } | |
8831 | ||
2b188cc1 JA |
8832 | static void io_mem_free(void *ptr) |
8833 | { | |
52e04ef4 MR |
8834 | struct page *page; |
8835 | ||
8836 | if (!ptr) | |
8837 | return; | |
2b188cc1 | 8838 | |
52e04ef4 | 8839 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8840 | if (put_page_testzero(page)) |
8841 | free_compound_page(page); | |
8842 | } | |
8843 | ||
8844 | static void *io_mem_alloc(size_t size) | |
8845 | { | |
8846 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8847 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8848 | |
8849 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8850 | } | |
8851 | ||
75b28aff HV |
8852 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8853 | size_t *sq_offset) | |
8854 | { | |
8855 | struct io_rings *rings; | |
8856 | size_t off, sq_array_size; | |
8857 | ||
8858 | off = struct_size(rings, cqes, cq_entries); | |
8859 | if (off == SIZE_MAX) | |
8860 | return SIZE_MAX; | |
8861 | ||
8862 | #ifdef CONFIG_SMP | |
8863 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8864 | if (off == 0) | |
8865 | return SIZE_MAX; | |
8866 | #endif | |
8867 | ||
b36200f5 DV |
8868 | if (sq_offset) |
8869 | *sq_offset = off; | |
8870 | ||
75b28aff HV |
8871 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8872 | if (sq_array_size == SIZE_MAX) | |
8873 | return SIZE_MAX; | |
8874 | ||
8875 | if (check_add_overflow(off, sq_array_size, &off)) | |
8876 | return SIZE_MAX; | |
8877 | ||
75b28aff HV |
8878 | return off; |
8879 | } | |
8880 | ||
41edf1a5 | 8881 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8882 | { |
41edf1a5 | 8883 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8884 | unsigned int i; |
8885 | ||
6224843d PB |
8886 | if (imu != ctx->dummy_ubuf) { |
8887 | for (i = 0; i < imu->nr_bvecs; i++) | |
8888 | unpin_user_page(imu->bvec[i].bv_page); | |
8889 | if (imu->acct_pages) | |
8890 | io_unaccount_mem(ctx, imu->acct_pages); | |
8891 | kvfree(imu); | |
8892 | } | |
41edf1a5 | 8893 | *slot = NULL; |
7f61a1e9 PB |
8894 | } |
8895 | ||
bd54b6fe | 8896 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8897 | { |
634d00df PB |
8898 | io_buffer_unmap(ctx, &prsrc->buf); |
8899 | prsrc->buf = NULL; | |
bd54b6fe | 8900 | } |
edafccee | 8901 | |
bd54b6fe BM |
8902 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8903 | { | |
8904 | unsigned int i; | |
edafccee | 8905 | |
7f61a1e9 PB |
8906 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8907 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8908 | kfree(ctx->user_bufs); |
bb6659cc | 8909 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8910 | ctx->user_bufs = NULL; |
bd54b6fe | 8911 | ctx->buf_data = NULL; |
edafccee | 8912 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8913 | } |
8914 | ||
0a96bbe4 | 8915 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8916 | { |
bd54b6fe | 8917 | int ret; |
edafccee | 8918 | |
bd54b6fe | 8919 | if (!ctx->buf_data) |
edafccee JA |
8920 | return -ENXIO; |
8921 | ||
bd54b6fe BM |
8922 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8923 | if (!ret) | |
8924 | __io_sqe_buffers_unregister(ctx); | |
8925 | return ret; | |
edafccee JA |
8926 | } |
8927 | ||
8928 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8929 | void __user *arg, unsigned index) | |
8930 | { | |
8931 | struct iovec __user *src; | |
8932 | ||
8933 | #ifdef CONFIG_COMPAT | |
8934 | if (ctx->compat) { | |
8935 | struct compat_iovec __user *ciovs; | |
8936 | struct compat_iovec ciov; | |
8937 | ||
8938 | ciovs = (struct compat_iovec __user *) arg; | |
8939 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8940 | return -EFAULT; | |
8941 | ||
d55e5f5b | 8942 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8943 | dst->iov_len = ciov.iov_len; |
8944 | return 0; | |
8945 | } | |
8946 | #endif | |
8947 | src = (struct iovec __user *) arg; | |
8948 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8949 | return -EFAULT; | |
8950 | return 0; | |
8951 | } | |
8952 | ||
de293938 JA |
8953 | /* |
8954 | * Not super efficient, but this is just a registration time. And we do cache | |
8955 | * the last compound head, so generally we'll only do a full search if we don't | |
8956 | * match that one. | |
8957 | * | |
8958 | * We check if the given compound head page has already been accounted, to | |
8959 | * avoid double accounting it. This allows us to account the full size of the | |
8960 | * page, not just the constituent pages of a huge page. | |
8961 | */ | |
8962 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8963 | int nr_pages, struct page *hpage) | |
8964 | { | |
8965 | int i, j; | |
8966 | ||
8967 | /* check current page array */ | |
8968 | for (i = 0; i < nr_pages; i++) { | |
8969 | if (!PageCompound(pages[i])) | |
8970 | continue; | |
8971 | if (compound_head(pages[i]) == hpage) | |
8972 | return true; | |
8973 | } | |
8974 | ||
8975 | /* check previously registered pages */ | |
8976 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8977 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8978 | |
8979 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8980 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8981 | continue; | |
8982 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8983 | return true; | |
8984 | } | |
8985 | } | |
8986 | ||
8987 | return false; | |
8988 | } | |
8989 | ||
8990 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8991 | int nr_pages, struct io_mapped_ubuf *imu, | |
8992 | struct page **last_hpage) | |
8993 | { | |
8994 | int i, ret; | |
8995 | ||
216e5835 | 8996 | imu->acct_pages = 0; |
de293938 JA |
8997 | for (i = 0; i < nr_pages; i++) { |
8998 | if (!PageCompound(pages[i])) { | |
8999 | imu->acct_pages++; | |
9000 | } else { | |
9001 | struct page *hpage; | |
9002 | ||
9003 | hpage = compound_head(pages[i]); | |
9004 | if (hpage == *last_hpage) | |
9005 | continue; | |
9006 | *last_hpage = hpage; | |
9007 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
9008 | continue; | |
9009 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
9010 | } | |
9011 | } | |
9012 | ||
9013 | if (!imu->acct_pages) | |
9014 | return 0; | |
9015 | ||
26bfa89e | 9016 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
9017 | if (ret) |
9018 | imu->acct_pages = 0; | |
9019 | return ret; | |
9020 | } | |
9021 | ||
0a96bbe4 | 9022 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 9023 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 9024 | struct page **last_hpage) |
edafccee | 9025 | { |
41edf1a5 | 9026 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
9027 | struct vm_area_struct **vmas = NULL; |
9028 | struct page **pages = NULL; | |
0a96bbe4 BM |
9029 | unsigned long off, start, end, ubuf; |
9030 | size_t size; | |
9031 | int ret, pret, nr_pages, i; | |
9032 | ||
6224843d PB |
9033 | if (!iov->iov_base) { |
9034 | *pimu = ctx->dummy_ubuf; | |
9035 | return 0; | |
9036 | } | |
9037 | ||
0a96bbe4 BM |
9038 | ubuf = (unsigned long) iov->iov_base; |
9039 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
9040 | start = ubuf >> PAGE_SHIFT; | |
9041 | nr_pages = end - start; | |
9042 | ||
41edf1a5 | 9043 | *pimu = NULL; |
0a96bbe4 BM |
9044 | ret = -ENOMEM; |
9045 | ||
9046 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
9047 | if (!pages) | |
9048 | goto done; | |
9049 | ||
9050 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
9051 | GFP_KERNEL); | |
9052 | if (!vmas) | |
9053 | goto done; | |
edafccee | 9054 | |
41edf1a5 | 9055 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 9056 | if (!imu) |
0a96bbe4 BM |
9057 | goto done; |
9058 | ||
9059 | ret = 0; | |
9060 | mmap_read_lock(current->mm); | |
9061 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
9062 | pages, vmas); | |
9063 | if (pret == nr_pages) { | |
9064 | /* don't support file backed memory */ | |
9065 | for (i = 0; i < nr_pages; i++) { | |
9066 | struct vm_area_struct *vma = vmas[i]; | |
9067 | ||
40dad765 PB |
9068 | if (vma_is_shmem(vma)) |
9069 | continue; | |
0a96bbe4 BM |
9070 | if (vma->vm_file && |
9071 | !is_file_hugepages(vma->vm_file)) { | |
9072 | ret = -EOPNOTSUPP; | |
9073 | break; | |
9074 | } | |
9075 | } | |
9076 | } else { | |
9077 | ret = pret < 0 ? pret : -EFAULT; | |
9078 | } | |
9079 | mmap_read_unlock(current->mm); | |
9080 | if (ret) { | |
9081 | /* | |
9082 | * if we did partial map, or found file backed vmas, | |
9083 | * release any pages we did get | |
9084 | */ | |
9085 | if (pret > 0) | |
9086 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9087 | goto done; |
9088 | } | |
9089 | ||
9090 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
9091 | if (ret) { | |
9092 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9093 | goto done; |
9094 | } | |
9095 | ||
9096 | off = ubuf & ~PAGE_MASK; | |
9097 | size = iov->iov_len; | |
9098 | for (i = 0; i < nr_pages; i++) { | |
9099 | size_t vec_len; | |
9100 | ||
9101 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
9102 | imu->bvec[i].bv_page = pages[i]; | |
9103 | imu->bvec[i].bv_len = vec_len; | |
9104 | imu->bvec[i].bv_offset = off; | |
9105 | off = 0; | |
9106 | size -= vec_len; | |
9107 | } | |
9108 | /* store original address for later verification */ | |
9109 | imu->ubuf = ubuf; | |
4751f53d | 9110 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 9111 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 9112 | *pimu = imu; |
0a96bbe4 BM |
9113 | ret = 0; |
9114 | done: | |
41edf1a5 PB |
9115 | if (ret) |
9116 | kvfree(imu); | |
0a96bbe4 BM |
9117 | kvfree(pages); |
9118 | kvfree(vmas); | |
9119 | return ret; | |
9120 | } | |
9121 | ||
2b358604 | 9122 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 9123 | { |
87094465 PB |
9124 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
9125 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9126 | } |
edafccee | 9127 | |
2b358604 BM |
9128 | static int io_buffer_validate(struct iovec *iov) |
9129 | { | |
50e96989 PB |
9130 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9131 | ||
2b358604 BM |
9132 | /* |
9133 | * Don't impose further limits on the size and buffer | |
9134 | * constraints here, we'll -EINVAL later when IO is | |
9135 | * submitted if they are wrong. | |
9136 | */ | |
6224843d PB |
9137 | if (!iov->iov_base) |
9138 | return iov->iov_len ? -EFAULT : 0; | |
9139 | if (!iov->iov_len) | |
2b358604 | 9140 | return -EFAULT; |
edafccee | 9141 | |
2b358604 BM |
9142 | /* arbitrary limit, but we need something */ |
9143 | if (iov->iov_len > SZ_1G) | |
9144 | return -EFAULT; | |
edafccee | 9145 | |
50e96989 PB |
9146 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9147 | return -EOVERFLOW; | |
9148 | ||
2b358604 BM |
9149 | return 0; |
9150 | } | |
edafccee | 9151 | |
2b358604 | 9152 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9153 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9154 | { |
bd54b6fe BM |
9155 | struct page *last_hpage = NULL; |
9156 | struct io_rsrc_data *data; | |
2b358604 BM |
9157 | int i, ret; |
9158 | struct iovec iov; | |
edafccee | 9159 | |
87094465 PB |
9160 | if (ctx->user_bufs) |
9161 | return -EBUSY; | |
489809e2 | 9162 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9163 | return -EINVAL; |
bd54b6fe | 9164 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9165 | if (ret) |
9166 | return ret; | |
d878c816 PB |
9167 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9168 | if (ret) | |
9169 | return ret; | |
bd54b6fe BM |
9170 | ret = io_buffers_map_alloc(ctx, nr_args); |
9171 | if (ret) { | |
bb6659cc | 9172 | io_rsrc_data_free(data); |
bd54b6fe BM |
9173 | return ret; |
9174 | } | |
edafccee | 9175 | |
87094465 | 9176 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9177 | ret = io_copy_iov(ctx, &iov, arg, i); |
9178 | if (ret) | |
0a96bbe4 | 9179 | break; |
2b358604 BM |
9180 | ret = io_buffer_validate(&iov); |
9181 | if (ret) | |
0a96bbe4 | 9182 | break; |
2d091d62 | 9183 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9184 | ret = -EINVAL; |
9185 | break; | |
9186 | } | |
edafccee | 9187 | |
41edf1a5 PB |
9188 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9189 | &last_hpage); | |
0a96bbe4 BM |
9190 | if (ret) |
9191 | break; | |
edafccee | 9192 | } |
0a96bbe4 | 9193 | |
bd54b6fe | 9194 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9195 | |
bd54b6fe BM |
9196 | ctx->buf_data = data; |
9197 | if (ret) | |
9198 | __io_sqe_buffers_unregister(ctx); | |
9199 | else | |
9200 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9201 | return ret; |
9202 | } | |
9203 | ||
634d00df PB |
9204 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9205 | struct io_uring_rsrc_update2 *up, | |
9206 | unsigned int nr_args) | |
9207 | { | |
9208 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9209 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9210 | struct page *last_hpage = NULL; |
9211 | bool needs_switch = false; | |
9212 | __u32 done; | |
9213 | int i, err; | |
9214 | ||
9215 | if (!ctx->buf_data) | |
9216 | return -ENXIO; | |
9217 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9218 | return -EINVAL; | |
9219 | ||
9220 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9221 | struct io_mapped_ubuf *imu; |
9222 | int offset = up->offset + done; | |
634d00df PB |
9223 | u64 tag = 0; |
9224 | ||
9225 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9226 | if (err) | |
9227 | break; | |
9228 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9229 | err = -EFAULT; | |
9230 | break; | |
9231 | } | |
0b8c0e7c PB |
9232 | err = io_buffer_validate(&iov); |
9233 | if (err) | |
9234 | break; | |
cf3770e7 CIK |
9235 | if (!iov.iov_base && tag) { |
9236 | err = -EINVAL; | |
9237 | break; | |
9238 | } | |
0b8c0e7c PB |
9239 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9240 | if (err) | |
9241 | break; | |
634d00df | 9242 | |
0b8c0e7c | 9243 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9244 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
9245 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
9246 | ctx->rsrc_node, ctx->user_bufs[i]); | |
9247 | if (unlikely(err)) { | |
9248 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9249 | break; |
0b8c0e7c | 9250 | } |
634d00df PB |
9251 | ctx->user_bufs[i] = NULL; |
9252 | needs_switch = true; | |
9253 | } | |
9254 | ||
0b8c0e7c | 9255 | ctx->user_bufs[i] = imu; |
2d091d62 | 9256 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9257 | } |
9258 | ||
9259 | if (needs_switch) | |
9260 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9261 | return done ? done : err; | |
9262 | } | |
9263 | ||
9b402849 JA |
9264 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
9265 | { | |
9266 | __s32 __user *fds = arg; | |
9267 | int fd; | |
9268 | ||
9269 | if (ctx->cq_ev_fd) | |
9270 | return -EBUSY; | |
9271 | ||
9272 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9273 | return -EFAULT; | |
9274 | ||
9275 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
9276 | if (IS_ERR(ctx->cq_ev_fd)) { | |
9277 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 9278 | |
9b402849 JA |
9279 | ctx->cq_ev_fd = NULL; |
9280 | return ret; | |
9281 | } | |
9282 | ||
9283 | return 0; | |
9284 | } | |
9285 | ||
9286 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9287 | { | |
9288 | if (ctx->cq_ev_fd) { | |
9289 | eventfd_ctx_put(ctx->cq_ev_fd); | |
9290 | ctx->cq_ev_fd = NULL; | |
9291 | return 0; | |
9292 | } | |
9293 | ||
9294 | return -ENXIO; | |
9295 | } | |
9296 | ||
5a2e745d JA |
9297 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9298 | { | |
9e15c3a0 JA |
9299 | struct io_buffer *buf; |
9300 | unsigned long index; | |
9301 | ||
1d0254e6 | 9302 | xa_for_each(&ctx->io_buffers, index, buf) |
9e15c3a0 | 9303 | __io_remove_buffers(ctx, buf, index, -1U); |
5a2e745d JA |
9304 | } |
9305 | ||
4010fec4 | 9306 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9307 | { |
cd0ca2e0 | 9308 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 9309 | int nr = 0; |
bf019da7 | 9310 | |
9a4fdbd8 | 9311 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 9312 | io_flush_cached_locked_reqs(ctx, state); |
9a4fdbd8 | 9313 | |
c2b6c6bc PB |
9314 | while (state->free_list.next) { |
9315 | struct io_wq_work_node *node; | |
9316 | struct io_kiocb *req; | |
9a4fdbd8 | 9317 | |
c2b6c6bc PB |
9318 | node = wq_stack_extract(&state->free_list); |
9319 | req = container_of(node, struct io_kiocb, comp_list); | |
9320 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 9321 | nr++; |
c2b6c6bc | 9322 | } |
37f0e767 PB |
9323 | if (nr) |
9324 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
9325 | mutex_unlock(&ctx->uring_lock); |
9326 | } | |
9327 | ||
43597aac | 9328 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9329 | { |
43597aac | 9330 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9331 | wait_for_completion(&data->done); |
bd54b6fe | 9332 | } |
04fc6c80 | 9333 | |
c072481d | 9334 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9335 | { |
37d1e2e3 | 9336 | io_sq_thread_finish(ctx); |
2aede0e4 | 9337 | |
37d1e2e3 | 9338 | if (ctx->mm_account) { |
2aede0e4 JA |
9339 | mmdrop(ctx->mm_account); |
9340 | ctx->mm_account = NULL; | |
30975825 | 9341 | } |
def596e9 | 9342 | |
ab409402 | 9343 | io_rsrc_refs_drop(ctx); |
43597aac PB |
9344 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9345 | io_wait_rsrc_data(ctx->buf_data); | |
9346 | io_wait_rsrc_data(ctx->file_data); | |
9347 | ||
8bad28d8 | 9348 | mutex_lock(&ctx->uring_lock); |
43597aac | 9349 | if (ctx->buf_data) |
bd54b6fe | 9350 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9351 | if (ctx->file_data) |
08480400 | 9352 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9353 | if (ctx->rings) |
9354 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 9355 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 9356 | io_eventfd_unregister(ctx); |
5a2e745d | 9357 | io_destroy_buffers(ctx); |
07db298a PB |
9358 | if (ctx->sq_creds) |
9359 | put_cred(ctx->sq_creds); | |
def596e9 | 9360 | |
a7f0ed5a PB |
9361 | /* there are no registered resources left, nobody uses it */ |
9362 | if (ctx->rsrc_node) | |
9363 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9364 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9365 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 9366 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 9367 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
9368 | |
9369 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9370 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9371 | |
2b188cc1 | 9372 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9373 | if (ctx->ring_sock) { |
9374 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9375 | sock_release(ctx->ring_sock); |
355e8d26 | 9376 | } |
2b188cc1 | 9377 | #endif |
ef9dd637 | 9378 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9379 | |
75b28aff | 9380 | io_mem_free(ctx->rings); |
2b188cc1 | 9381 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9382 | |
9383 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9384 | free_uid(ctx->user); |
4010fec4 | 9385 | io_req_caches_free(ctx); |
e941894e JA |
9386 | if (ctx->hash_map) |
9387 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9388 | kfree(ctx->cancel_hash); |
6224843d | 9389 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
9390 | kfree(ctx); |
9391 | } | |
9392 | ||
9393 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9394 | { | |
9395 | struct io_ring_ctx *ctx = file->private_data; | |
9396 | __poll_t mask = 0; | |
9397 | ||
d60aa65b | 9398 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
9399 | /* |
9400 | * synchronizes with barrier from wq_has_sleeper call in | |
9401 | * io_commit_cqring | |
9402 | */ | |
2b188cc1 | 9403 | smp_rmb(); |
90554200 | 9404 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9405 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9406 | |
9407 | /* | |
9408 | * Don't flush cqring overflow list here, just do a simple check. | |
9409 | * Otherwise there could possible be ABBA deadlock: | |
9410 | * CPU0 CPU1 | |
9411 | * ---- ---- | |
9412 | * lock(&ctx->uring_lock); | |
9413 | * lock(&ep->mtx); | |
9414 | * lock(&ctx->uring_lock); | |
9415 | * lock(&ep->mtx); | |
9416 | * | |
9417 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9418 | * pushs them to do the flush. | |
9419 | */ | |
5ed7a37d | 9420 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9421 | mask |= EPOLLIN | EPOLLRDNORM; |
9422 | ||
9423 | return mask; | |
9424 | } | |
9425 | ||
0bead8cd | 9426 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9427 | { |
4379bf8b | 9428 | const struct cred *creds; |
071698e1 | 9429 | |
61cf9370 | 9430 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9431 | if (creds) { |
9432 | put_cred(creds); | |
0bead8cd | 9433 | return 0; |
1e6fa521 | 9434 | } |
0bead8cd YD |
9435 | |
9436 | return -EINVAL; | |
9437 | } | |
9438 | ||
d56d938b PB |
9439 | struct io_tctx_exit { |
9440 | struct callback_head task_work; | |
9441 | struct completion completion; | |
baf186c4 | 9442 | struct io_ring_ctx *ctx; |
d56d938b PB |
9443 | }; |
9444 | ||
c072481d | 9445 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
9446 | { |
9447 | struct io_uring_task *tctx = current->io_uring; | |
9448 | struct io_tctx_exit *work; | |
9449 | ||
9450 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9451 | /* | |
9452 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9453 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9454 | */ | |
9455 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9456 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9457 | complete(&work->completion); |
9458 | } | |
9459 | ||
c072481d | 9460 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
9461 | { |
9462 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9463 | ||
9464 | return req->ctx == data; | |
9465 | } | |
9466 | ||
c072481d | 9467 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 9468 | { |
d56d938b | 9469 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9470 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9471 | unsigned long interval = HZ / 20; |
d56d938b PB |
9472 | struct io_tctx_exit exit; |
9473 | struct io_tctx_node *node; | |
9474 | int ret; | |
85faa7b8 | 9475 | |
56952e91 JA |
9476 | /* |
9477 | * If we're doing polled IO and end up having requests being | |
9478 | * submitted async (out-of-line), then completions can come in while | |
9479 | * we're waiting for refs to drop. We need to reap these manually, | |
9480 | * as nobody else will be looking for them. | |
9481 | */ | |
b2edc0a7 | 9482 | do { |
3dd0c97a | 9483 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9484 | if (ctx->sq_data) { |
9485 | struct io_sq_data *sqd = ctx->sq_data; | |
9486 | struct task_struct *tsk; | |
9487 | ||
9488 | io_sq_thread_park(sqd); | |
9489 | tsk = sqd->thread; | |
9490 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9491 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9492 | io_cancel_ctx_cb, ctx, true); | |
9493 | io_sq_thread_unpark(sqd); | |
9494 | } | |
b5bb3a24 | 9495 | |
37f0e767 PB |
9496 | io_req_caches_free(ctx); |
9497 | ||
58d3be2c PB |
9498 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9499 | /* there is little hope left, don't run it too often */ | |
9500 | interval = HZ * 60; | |
9501 | } | |
9502 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9503 | |
7f00651a PB |
9504 | init_completion(&exit.completion); |
9505 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9506 | exit.ctx = ctx; | |
89b5066e PB |
9507 | /* |
9508 | * Some may use context even when all refs and requests have been put, | |
9509 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9510 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9511 | * this lock/unlock section also waits them to finish. |
9512 | */ | |
d56d938b PB |
9513 | mutex_lock(&ctx->uring_lock); |
9514 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9515 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9516 | ||
d56d938b PB |
9517 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9518 | ctx_node); | |
7f00651a PB |
9519 | /* don't spin on a single task if cancellation failed */ |
9520 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9521 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9522 | if (WARN_ON_ONCE(ret)) | |
9523 | continue; | |
d56d938b PB |
9524 | |
9525 | mutex_unlock(&ctx->uring_lock); | |
9526 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9527 | mutex_lock(&ctx->uring_lock); |
9528 | } | |
9529 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9530 | spin_lock(&ctx->completion_lock); |
9531 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9532 | |
85faa7b8 JA |
9533 | io_ring_ctx_free(ctx); |
9534 | } | |
9535 | ||
80c4cbdb | 9536 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
9537 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
9538 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
9539 | { |
9540 | struct io_kiocb *req, *tmp; | |
9541 | int canceled = 0; | |
9542 | ||
79ebeaee JA |
9543 | spin_lock(&ctx->completion_lock); |
9544 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9545 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9546 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9547 | io_kill_timeout(req, -ECANCELED); |
9548 | canceled++; | |
9549 | } | |
9550 | } | |
79ebeaee | 9551 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9552 | if (canceled != 0) |
9553 | io_commit_cqring(ctx); | |
79ebeaee | 9554 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9555 | if (canceled != 0) |
9556 | io_cqring_ev_posted(ctx); | |
9557 | return canceled != 0; | |
9558 | } | |
9559 | ||
c072481d | 9560 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 9561 | { |
61cf9370 MWO |
9562 | unsigned long index; |
9563 | struct creds *creds; | |
9564 | ||
2b188cc1 JA |
9565 | mutex_lock(&ctx->uring_lock); |
9566 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9567 | if (ctx->rings) |
6c2450ae | 9568 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9569 | xa_for_each(&ctx->personalities, index, creds) |
9570 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9571 | mutex_unlock(&ctx->uring_lock); |
9572 | ||
3dd0c97a PB |
9573 | io_kill_timeouts(ctx, NULL, true); |
9574 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9575 | |
15dff286 | 9576 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9577 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9578 | |
85faa7b8 | 9579 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9580 | /* |
9581 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9582 | * if we're exiting a ton of rings at the same time. It just adds | |
9583 | * noise and overhead, there's no discernable change in runtime | |
9584 | * over using system_wq. | |
9585 | */ | |
9586 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9587 | } |
9588 | ||
9589 | static int io_uring_release(struct inode *inode, struct file *file) | |
9590 | { | |
9591 | struct io_ring_ctx *ctx = file->private_data; | |
9592 | ||
9593 | file->private_data = NULL; | |
9594 | io_ring_ctx_wait_and_kill(ctx); | |
9595 | return 0; | |
9596 | } | |
9597 | ||
f6edbabb PB |
9598 | struct io_task_cancel { |
9599 | struct task_struct *task; | |
3dd0c97a | 9600 | bool all; |
f6edbabb | 9601 | }; |
f254ac04 | 9602 | |
f6edbabb | 9603 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9604 | { |
9a472ef7 | 9605 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9606 | struct io_task_cancel *cancel = data; |
9a472ef7 | 9607 | |
6af3f48b | 9608 | return io_match_task_safe(req, cancel->task, cancel->all); |
b711d4ea JA |
9609 | } |
9610 | ||
c072481d PB |
9611 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
9612 | struct task_struct *task, | |
9613 | bool cancel_all) | |
b7ddce3c | 9614 | { |
e1915f76 | 9615 | struct io_defer_entry *de; |
b7ddce3c PB |
9616 | LIST_HEAD(list); |
9617 | ||
79ebeaee | 9618 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9619 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
6af3f48b | 9620 | if (io_match_task_safe(de->req, task, cancel_all)) { |
b7ddce3c PB |
9621 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9622 | break; | |
9623 | } | |
9624 | } | |
79ebeaee | 9625 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9626 | if (list_empty(&list)) |
9627 | return false; | |
b7ddce3c PB |
9628 | |
9629 | while (!list_empty(&list)) { | |
9630 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9631 | list_del_init(&de->list); | |
f41db273 | 9632 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9633 | kfree(de); |
9634 | } | |
e1915f76 | 9635 | return true; |
b7ddce3c PB |
9636 | } |
9637 | ||
c072481d | 9638 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
9639 | { |
9640 | struct io_tctx_node *node; | |
9641 | enum io_wq_cancel cret; | |
9642 | bool ret = false; | |
9643 | ||
9644 | mutex_lock(&ctx->uring_lock); | |
9645 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9646 | struct io_uring_task *tctx = node->task->io_uring; | |
9647 | ||
9648 | /* | |
9649 | * io_wq will stay alive while we hold uring_lock, because it's | |
9650 | * killed after ctx nodes, which requires to take the lock. | |
9651 | */ | |
9652 | if (!tctx || !tctx->io_wq) | |
9653 | continue; | |
9654 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9655 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9656 | } | |
9657 | mutex_unlock(&ctx->uring_lock); | |
9658 | ||
9659 | return ret; | |
9660 | } | |
9661 | ||
c072481d PB |
9662 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9663 | struct task_struct *task, | |
9664 | bool cancel_all) | |
9936c7c2 | 9665 | { |
3dd0c97a | 9666 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9667 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9668 | |
9669 | while (1) { | |
9670 | enum io_wq_cancel cret; | |
9671 | bool ret = false; | |
9672 | ||
1b00764f PB |
9673 | if (!task) { |
9674 | ret |= io_uring_try_cancel_iowq(ctx); | |
9675 | } else if (tctx && tctx->io_wq) { | |
9676 | /* | |
9677 | * Cancels requests of all rings, not only @ctx, but | |
9678 | * it's fine as the task is in exit/exec. | |
9679 | */ | |
5aa75ed5 | 9680 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9681 | &cancel, true); |
9682 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9683 | } | |
9684 | ||
9685 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9686 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9687 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 9688 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
9689 | io_iopoll_try_reap_events(ctx); |
9690 | ret = true; | |
9691 | } | |
9692 | } | |
9693 | ||
3dd0c97a PB |
9694 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9695 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9696 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9697 | if (task) |
9698 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9699 | if (!ret) |
9700 | break; | |
9701 | cond_resched(); | |
9702 | } | |
9703 | } | |
9704 | ||
eef51daa | 9705 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9706 | { |
236434c3 | 9707 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9708 | struct io_tctx_node *node; |
a528b04e | 9709 | int ret; |
236434c3 MWO |
9710 | |
9711 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9712 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9713 | if (unlikely(ret)) |
9714 | return ret; | |
e139a1ec | 9715 | |
236434c3 | 9716 | tctx = current->io_uring; |
e139a1ec PB |
9717 | if (ctx->iowq_limits_set) { |
9718 | unsigned int limits[2] = { ctx->iowq_limits[0], | |
9719 | ctx->iowq_limits[1], }; | |
9720 | ||
9721 | ret = io_wq_max_workers(tctx->io_wq, limits); | |
9722 | if (ret) | |
9723 | return ret; | |
9724 | } | |
0f212204 | 9725 | } |
cf27f3b1 PB |
9726 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9727 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9728 | if (!node) | |
9729 | return -ENOMEM; | |
9730 | node->ctx = ctx; | |
9731 | node->task = current; | |
13bf43f5 | 9732 | |
cf27f3b1 PB |
9733 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9734 | node, GFP_KERNEL)); | |
9735 | if (ret) { | |
9736 | kfree(node); | |
9737 | return ret; | |
0f212204 | 9738 | } |
cf27f3b1 PB |
9739 | |
9740 | mutex_lock(&ctx->uring_lock); | |
9741 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9742 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9743 | } |
cf27f3b1 | 9744 | tctx->last = ctx; |
0f212204 JA |
9745 | return 0; |
9746 | } | |
9747 | ||
cf27f3b1 PB |
9748 | /* |
9749 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9750 | */ | |
eef51daa | 9751 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9752 | { |
9753 | struct io_uring_task *tctx = current->io_uring; | |
9754 | ||
9755 | if (likely(tctx && tctx->last == ctx)) | |
9756 | return 0; | |
eef51daa | 9757 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9758 | } |
9759 | ||
0f212204 JA |
9760 | /* |
9761 | * Remove this io_uring_file -> task mapping. | |
9762 | */ | |
c072481d | 9763 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9764 | { |
9765 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9766 | struct io_tctx_node *node; |
2941267b | 9767 | |
eebd2e37 PB |
9768 | if (!tctx) |
9769 | return; | |
13bf43f5 PB |
9770 | node = xa_erase(&tctx->xa, index); |
9771 | if (!node) | |
2941267b | 9772 | return; |
0f212204 | 9773 | |
13bf43f5 PB |
9774 | WARN_ON_ONCE(current != node->task); |
9775 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9776 | ||
9777 | mutex_lock(&node->ctx->uring_lock); | |
9778 | list_del(&node->ctx_node); | |
9779 | mutex_unlock(&node->ctx->uring_lock); | |
9780 | ||
baf186c4 | 9781 | if (tctx->last == node->ctx) |
0f212204 | 9782 | tctx->last = NULL; |
13bf43f5 | 9783 | kfree(node); |
0f212204 JA |
9784 | } |
9785 | ||
c072481d | 9786 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9787 | { |
ba5ef6dc | 9788 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9789 | struct io_tctx_node *node; |
de7f1d9e PB |
9790 | unsigned long index; |
9791 | ||
8bab4c09 | 9792 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 9793 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
9794 | cond_resched(); |
9795 | } | |
b16ef427 ME |
9796 | if (wq) { |
9797 | /* | |
f6f9b278 | 9798 | * Must be after io_uring_del_tctx_node() (removes nodes under |
b16ef427 ME |
9799 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). |
9800 | */ | |
ba5ef6dc | 9801 | io_wq_put_and_exit(wq); |
dadebc35 | 9802 | tctx->io_wq = NULL; |
b16ef427 | 9803 | } |
de7f1d9e PB |
9804 | } |
9805 | ||
3f48cf18 | 9806 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9807 | { |
3f48cf18 PB |
9808 | if (tracked) |
9809 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9810 | return percpu_counter_sum(&tctx->inflight); |
9811 | } | |
9812 | ||
c072481d | 9813 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
09899b19 PB |
9814 | { |
9815 | struct io_uring_task *tctx = task->io_uring; | |
9816 | unsigned int refs = tctx->cached_refs; | |
9817 | ||
e9dbe221 PB |
9818 | if (refs) { |
9819 | tctx->cached_refs = 0; | |
9820 | percpu_counter_sub(&tctx->inflight, refs); | |
9821 | put_task_struct_many(task, refs); | |
9822 | } | |
09899b19 PB |
9823 | } |
9824 | ||
78cc687b PB |
9825 | /* |
9826 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9827 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9828 | */ | |
c072481d PB |
9829 | static __cold void io_uring_cancel_generic(bool cancel_all, |
9830 | struct io_sq_data *sqd) | |
0e9ddb39 | 9831 | { |
521d6a73 | 9832 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9833 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9834 | s64 inflight; |
9835 | DEFINE_WAIT(wait); | |
fdaf083c | 9836 | |
78cc687b PB |
9837 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9838 | ||
6d042ffb PO |
9839 | if (!current->io_uring) |
9840 | return; | |
17a91051 PB |
9841 | if (tctx->io_wq) |
9842 | io_wq_exit_start(tctx->io_wq); | |
9843 | ||
0e9ddb39 PB |
9844 | atomic_inc(&tctx->in_idle); |
9845 | do { | |
e9dbe221 | 9846 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9847 | /* read completions before cancelations */ |
78cc687b | 9848 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9849 | if (!inflight) |
9850 | break; | |
fdaf083c | 9851 | |
78cc687b PB |
9852 | if (!sqd) { |
9853 | struct io_tctx_node *node; | |
9854 | unsigned long index; | |
0f212204 | 9855 | |
78cc687b PB |
9856 | xa_for_each(&tctx->xa, index, node) { |
9857 | /* sqpoll task will cancel all its requests */ | |
9858 | if (node->ctx->sq_data) | |
9859 | continue; | |
9860 | io_uring_try_cancel_requests(node->ctx, current, | |
9861 | cancel_all); | |
9862 | } | |
9863 | } else { | |
9864 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9865 | io_uring_try_cancel_requests(ctx, current, | |
9866 | cancel_all); | |
9867 | } | |
17a91051 | 9868 | |
0f212204 | 9869 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9870 | io_uring_drop_tctx_refs(current); |
0f212204 | 9871 | /* |
a1bb3cd5 PB |
9872 | * If we've seen completions, retry without waiting. This |
9873 | * avoids a race where a completion comes in before we did | |
9874 | * prepare_to_wait(). | |
0f212204 | 9875 | */ |
3dd0c97a | 9876 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9877 | schedule(); |
f57555ed | 9878 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9879 | } while (1); |
fdaf083c | 9880 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9881 | |
8452d4a6 | 9882 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9883 | if (cancel_all) { |
3f48cf18 PB |
9884 | /* for exec all current's requests should be gone, kill tctx */ |
9885 | __io_uring_free(current); | |
9886 | } | |
44e728b8 PB |
9887 | } |
9888 | ||
f552a27a | 9889 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9890 | { |
f552a27a | 9891 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9892 | } |
9893 | ||
6c5c240e RP |
9894 | static void *io_uring_validate_mmap_request(struct file *file, |
9895 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9896 | { |
2b188cc1 | 9897 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9898 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9899 | struct page *page; |
9900 | void *ptr; | |
9901 | ||
9902 | switch (offset) { | |
9903 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9904 | case IORING_OFF_CQ_RING: |
9905 | ptr = ctx->rings; | |
2b188cc1 JA |
9906 | break; |
9907 | case IORING_OFF_SQES: | |
9908 | ptr = ctx->sq_sqes; | |
9909 | break; | |
2b188cc1 | 9910 | default: |
6c5c240e | 9911 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9912 | } |
9913 | ||
9914 | page = virt_to_head_page(ptr); | |
a50b854e | 9915 | if (sz > page_size(page)) |
6c5c240e RP |
9916 | return ERR_PTR(-EINVAL); |
9917 | ||
9918 | return ptr; | |
9919 | } | |
9920 | ||
9921 | #ifdef CONFIG_MMU | |
9922 | ||
c072481d | 9923 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
9924 | { |
9925 | size_t sz = vma->vm_end - vma->vm_start; | |
9926 | unsigned long pfn; | |
9927 | void *ptr; | |
9928 | ||
9929 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9930 | if (IS_ERR(ptr)) | |
9931 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9932 | |
9933 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9934 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9935 | } | |
9936 | ||
6c5c240e RP |
9937 | #else /* !CONFIG_MMU */ |
9938 | ||
9939 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9940 | { | |
9941 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9942 | } | |
9943 | ||
9944 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9945 | { | |
9946 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9947 | } | |
9948 | ||
9949 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9950 | unsigned long addr, unsigned long len, | |
9951 | unsigned long pgoff, unsigned long flags) | |
9952 | { | |
9953 | void *ptr; | |
9954 | ||
9955 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9956 | if (IS_ERR(ptr)) | |
9957 | return PTR_ERR(ptr); | |
9958 | ||
9959 | return (unsigned long) ptr; | |
9960 | } | |
9961 | ||
9962 | #endif /* !CONFIG_MMU */ | |
9963 | ||
d9d05217 | 9964 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9965 | { |
9966 | DEFINE_WAIT(wait); | |
9967 | ||
9968 | do { | |
9969 | if (!io_sqring_full(ctx)) | |
9970 | break; | |
90554200 JA |
9971 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9972 | ||
9973 | if (!io_sqring_full(ctx)) | |
9974 | break; | |
90554200 JA |
9975 | schedule(); |
9976 | } while (!signal_pending(current)); | |
9977 | ||
9978 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9979 | return 0; |
90554200 JA |
9980 | } |
9981 | ||
c73ebb68 HX |
9982 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9983 | struct __kernel_timespec __user **ts, | |
9984 | const sigset_t __user **sig) | |
9985 | { | |
9986 | struct io_uring_getevents_arg arg; | |
9987 | ||
9988 | /* | |
9989 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9990 | * is just a pointer to the sigset_t. | |
9991 | */ | |
9992 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9993 | *sig = (const sigset_t __user *) argp; | |
9994 | *ts = NULL; | |
9995 | return 0; | |
9996 | } | |
9997 | ||
9998 | /* | |
9999 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
10000 | * timespec and sigset_t pointers if good. | |
10001 | */ | |
10002 | if (*argsz != sizeof(arg)) | |
10003 | return -EINVAL; | |
10004 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
10005 | return -EFAULT; | |
10006 | *sig = u64_to_user_ptr(arg.sigmask); | |
10007 | *argsz = arg.sigmask_sz; | |
10008 | *ts = u64_to_user_ptr(arg.ts); | |
10009 | return 0; | |
10010 | } | |
10011 | ||
2b188cc1 | 10012 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
10013 | u32, min_complete, u32, flags, const void __user *, argp, |
10014 | size_t, argsz) | |
2b188cc1 JA |
10015 | { |
10016 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
10017 | int submitted = 0; |
10018 | struct fd f; | |
33f993da | 10019 | long ret; |
2b188cc1 | 10020 | |
4c6e277c | 10021 | io_run_task_work(); |
b41e9852 | 10022 | |
33f993da PB |
10023 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
10024 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
10025 | return -EINVAL; |
10026 | ||
10027 | f = fdget(fd); | |
33f993da | 10028 | if (unlikely(!f.file)) |
2b188cc1 JA |
10029 | return -EBADF; |
10030 | ||
10031 | ret = -EOPNOTSUPP; | |
33f993da | 10032 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
10033 | goto out_fput; |
10034 | ||
10035 | ret = -ENXIO; | |
10036 | ctx = f.file->private_data; | |
33f993da | 10037 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
10038 | goto out_fput; |
10039 | ||
7e84e1c7 | 10040 | ret = -EBADFD; |
33f993da | 10041 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
10042 | goto out; |
10043 | ||
6c271ce2 JA |
10044 | /* |
10045 | * For SQ polling, the thread will do all submissions and completions. | |
10046 | * Just return the requested submit count, and wake the thread if | |
10047 | * we were asked to. | |
10048 | */ | |
b2a9eada | 10049 | ret = 0; |
6c271ce2 | 10050 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 10051 | io_cqring_overflow_flush(ctx); |
89448c47 | 10052 | |
21f96522 JA |
10053 | if (unlikely(ctx->sq_data->thread == NULL)) { |
10054 | ret = -EOWNERDEAD; | |
04147488 | 10055 | goto out; |
21f96522 | 10056 | } |
6c271ce2 | 10057 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 10058 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
10059 | if (flags & IORING_ENTER_SQ_WAIT) { |
10060 | ret = io_sqpoll_wait_sq(ctx); | |
10061 | if (ret) | |
10062 | goto out; | |
10063 | } | |
6c271ce2 | 10064 | submitted = to_submit; |
b2a9eada | 10065 | } else if (to_submit) { |
eef51daa | 10066 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
10067 | if (unlikely(ret)) |
10068 | goto out; | |
2b188cc1 | 10069 | mutex_lock(&ctx->uring_lock); |
0f212204 | 10070 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 10071 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
10072 | |
10073 | if (submitted != to_submit) | |
10074 | goto out; | |
2b188cc1 JA |
10075 | } |
10076 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
10077 | const sigset_t __user *sig; |
10078 | struct __kernel_timespec __user *ts; | |
10079 | ||
10080 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
10081 | if (unlikely(ret)) | |
10082 | goto out; | |
10083 | ||
2b188cc1 JA |
10084 | min_complete = min(min_complete, ctx->cq_entries); |
10085 | ||
32b2244a XW |
10086 | /* |
10087 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
10088 | * space applications don't need to do io completion events | |
10089 | * polling again, they can rely on io_sq_thread to do polling | |
10090 | * work, which can reduce cpu usage and uring_lock contention. | |
10091 | */ | |
10092 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
10093 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 10094 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 10095 | } else { |
c73ebb68 | 10096 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 10097 | } |
2b188cc1 JA |
10098 | } |
10099 | ||
7c504e65 | 10100 | out: |
6805b32e | 10101 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
10102 | out_fput: |
10103 | fdput(f); | |
10104 | return submitted ? submitted : ret; | |
10105 | } | |
10106 | ||
bebdb65e | 10107 | #ifdef CONFIG_PROC_FS |
c072481d | 10108 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 10109 | const struct cred *cred) |
87ce955b | 10110 | { |
87ce955b JA |
10111 | struct user_namespace *uns = seq_user_ns(m); |
10112 | struct group_info *gi; | |
10113 | kernel_cap_t cap; | |
10114 | unsigned __capi; | |
10115 | int g; | |
10116 | ||
10117 | seq_printf(m, "%5d\n", id); | |
10118 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
10119 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
10120 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
10121 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10122 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10123 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10124 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10125 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10126 | seq_puts(m, "\n\tGroups:\t"); | |
10127 | gi = cred->group_info; | |
10128 | for (g = 0; g < gi->ngroups; g++) { | |
10129 | seq_put_decimal_ull(m, g ? " " : "", | |
10130 | from_kgid_munged(uns, gi->gid[g])); | |
10131 | } | |
10132 | seq_puts(m, "\n\tCapEff:\t"); | |
10133 | cap = cred->cap_effective; | |
10134 | CAP_FOR_EACH_U32(__capi) | |
10135 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10136 | seq_putc(m, '\n'); | |
10137 | return 0; | |
10138 | } | |
10139 | ||
c072481d PB |
10140 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
10141 | struct seq_file *m) | |
87ce955b | 10142 | { |
dbbe9c64 | 10143 | struct io_sq_data *sq = NULL; |
83f84356 HX |
10144 | struct io_overflow_cqe *ocqe; |
10145 | struct io_rings *r = ctx->rings; | |
10146 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
83f84356 HX |
10147 | unsigned int sq_head = READ_ONCE(r->sq.head); |
10148 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
10149 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
10150 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
f75d1183 | 10151 | unsigned int sq_entries, cq_entries; |
fad8e0de | 10152 | bool has_lock; |
83f84356 HX |
10153 | unsigned int i; |
10154 | ||
10155 | /* | |
10156 | * we may get imprecise sqe and cqe info if uring is actively running | |
10157 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
10158 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
10159 | * we usually use these info when it is stuck. | |
10160 | */ | |
f75d1183 JA |
10161 | seq_printf(m, "SqMask:\t\t0x%x\n", sq_mask); |
10162 | seq_printf(m, "SqHead:\t%u\n", sq_head); | |
10163 | seq_printf(m, "SqTail:\t%u\n", sq_tail); | |
10164 | seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head); | |
10165 | seq_printf(m, "CqMask:\t0x%x\n", cq_mask); | |
10166 | seq_printf(m, "CqHead:\t%u\n", cq_head); | |
10167 | seq_printf(m, "CqTail:\t%u\n", cq_tail); | |
10168 | seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail); | |
10169 | seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head); | |
10170 | sq_entries = min(sq_tail - sq_head, ctx->sq_entries); | |
10171 | for (i = 0; i < sq_entries; i++) { | |
10172 | unsigned int entry = i + sq_head; | |
10173 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); | |
a1957780 | 10174 | struct io_uring_sqe *sqe; |
f75d1183 JA |
10175 | |
10176 | if (sq_idx > sq_mask) | |
10177 | continue; | |
10178 | sqe = &ctx->sq_sqes[sq_idx]; | |
10179 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
10180 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, | |
10181 | sqe->user_data); | |
83f84356 | 10182 | } |
f75d1183 JA |
10183 | seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); |
10184 | cq_entries = min(cq_tail - cq_head, ctx->cq_entries); | |
10185 | for (i = 0; i < cq_entries; i++) { | |
10186 | unsigned int entry = i + cq_head; | |
10187 | struct io_uring_cqe *cqe = &r->cqes[entry & cq_mask]; | |
83f84356 HX |
10188 | |
10189 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
f75d1183 JA |
10190 | entry & cq_mask, cqe->user_data, cqe->res, |
10191 | cqe->flags); | |
83f84356 | 10192 | } |
87ce955b | 10193 | |
fad8e0de JA |
10194 | /* |
10195 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10196 | * since fdinfo case grabs it in the opposite direction of normal use | |
10197 | * cases. If we fail to get the lock, we just don't iterate any | |
10198 | * structures that could be going away outside the io_uring mutex. | |
10199 | */ | |
10200 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10201 | ||
5f3f26f9 | 10202 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10203 | sq = ctx->sq_data; |
5f3f26f9 JA |
10204 | if (!sq->thread) |
10205 | sq = NULL; | |
10206 | } | |
dbbe9c64 JQ |
10207 | |
10208 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10209 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10210 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10211 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10212 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10213 | |
87ce955b JA |
10214 | if (f) |
10215 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10216 | else | |
10217 | seq_printf(m, "%5u: <none>\n", i); | |
10218 | } | |
10219 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10220 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10221 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10222 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10223 | |
4751f53d | 10224 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10225 | } |
61cf9370 MWO |
10226 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10227 | unsigned long index; | |
10228 | const struct cred *cred; | |
10229 | ||
87ce955b | 10230 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10231 | xa_for_each(&ctx->personalities, index, cred) |
10232 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10233 | } |
83f84356 HX |
10234 | if (has_lock) |
10235 | mutex_unlock(&ctx->uring_lock); | |
10236 | ||
10237 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 10238 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10239 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10240 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10241 | struct io_kiocb *req; | |
10242 | ||
10243 | hlist_for_each_entry(req, list, hash_node) | |
10244 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
10245 | req->task->task_works != NULL); | |
10246 | } | |
83f84356 HX |
10247 | |
10248 | seq_puts(m, "CqOverflowList:\n"); | |
10249 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
10250 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
10251 | ||
10252 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
10253 | cqe->user_data, cqe->res, cqe->flags); | |
10254 | ||
10255 | } | |
10256 | ||
79ebeaee | 10257 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
10258 | } |
10259 | ||
c072481d | 10260 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
10261 | { |
10262 | struct io_ring_ctx *ctx = f->private_data; | |
10263 | ||
10264 | if (percpu_ref_tryget(&ctx->refs)) { | |
10265 | __io_uring_show_fdinfo(ctx, m); | |
10266 | percpu_ref_put(&ctx->refs); | |
10267 | } | |
10268 | } | |
bebdb65e | 10269 | #endif |
87ce955b | 10270 | |
2b188cc1 JA |
10271 | static const struct file_operations io_uring_fops = { |
10272 | .release = io_uring_release, | |
10273 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10274 | #ifndef CONFIG_MMU |
10275 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10276 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10277 | #endif | |
2b188cc1 | 10278 | .poll = io_uring_poll, |
bebdb65e | 10279 | #ifdef CONFIG_PROC_FS |
87ce955b | 10280 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10281 | #endif |
2b188cc1 JA |
10282 | }; |
10283 | ||
c072481d PB |
10284 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
10285 | struct io_uring_params *p) | |
2b188cc1 | 10286 | { |
75b28aff HV |
10287 | struct io_rings *rings; |
10288 | size_t size, sq_array_offset; | |
2b188cc1 | 10289 | |
bd740481 JA |
10290 | /* make sure these are sane, as we already accounted them */ |
10291 | ctx->sq_entries = p->sq_entries; | |
10292 | ctx->cq_entries = p->cq_entries; | |
10293 | ||
75b28aff HV |
10294 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10295 | if (size == SIZE_MAX) | |
10296 | return -EOVERFLOW; | |
10297 | ||
10298 | rings = io_mem_alloc(size); | |
10299 | if (!rings) | |
2b188cc1 JA |
10300 | return -ENOMEM; |
10301 | ||
75b28aff HV |
10302 | ctx->rings = rings; |
10303 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
10304 | rings->sq_ring_mask = p->sq_entries - 1; | |
10305 | rings->cq_ring_mask = p->cq_entries - 1; | |
10306 | rings->sq_ring_entries = p->sq_entries; | |
10307 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
10308 | |
10309 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
10310 | if (size == SIZE_MAX) { |
10311 | io_mem_free(ctx->rings); | |
10312 | ctx->rings = NULL; | |
2b188cc1 | 10313 | return -EOVERFLOW; |
eb065d30 | 10314 | } |
2b188cc1 JA |
10315 | |
10316 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
10317 | if (!ctx->sq_sqes) { |
10318 | io_mem_free(ctx->rings); | |
10319 | ctx->rings = NULL; | |
2b188cc1 | 10320 | return -ENOMEM; |
eb065d30 | 10321 | } |
2b188cc1 | 10322 | |
2b188cc1 JA |
10323 | return 0; |
10324 | } | |
10325 | ||
9faadcc8 PB |
10326 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
10327 | { | |
10328 | int ret, fd; | |
10329 | ||
10330 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
10331 | if (fd < 0) | |
10332 | return fd; | |
10333 | ||
eef51daa | 10334 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
10335 | if (ret) { |
10336 | put_unused_fd(fd); | |
10337 | return ret; | |
10338 | } | |
10339 | fd_install(fd, file); | |
10340 | return fd; | |
10341 | } | |
10342 | ||
2b188cc1 JA |
10343 | /* |
10344 | * Allocate an anonymous fd, this is what constitutes the application | |
10345 | * visible backing of an io_uring instance. The application mmaps this | |
10346 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
10347 | * we have to tie this fd to a socket for file garbage collection purposes. | |
10348 | */ | |
9faadcc8 | 10349 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
10350 | { |
10351 | struct file *file; | |
9faadcc8 | 10352 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
10353 | int ret; |
10354 | ||
2b188cc1 JA |
10355 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
10356 | &ctx->ring_sock); | |
10357 | if (ret) | |
9faadcc8 | 10358 | return ERR_PTR(ret); |
2b188cc1 JA |
10359 | #endif |
10360 | ||
91a9ab7c PM |
10361 | file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx, |
10362 | O_RDWR | O_CLOEXEC, NULL); | |
2b188cc1 | 10363 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
10364 | if (IS_ERR(file)) { |
10365 | sock_release(ctx->ring_sock); | |
10366 | ctx->ring_sock = NULL; | |
10367 | } else { | |
10368 | ctx->ring_sock->file = file; | |
0f212204 | 10369 | } |
2b188cc1 | 10370 | #endif |
9faadcc8 | 10371 | return file; |
2b188cc1 JA |
10372 | } |
10373 | ||
c072481d PB |
10374 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
10375 | struct io_uring_params __user *params) | |
2b188cc1 | 10376 | { |
2b188cc1 | 10377 | struct io_ring_ctx *ctx; |
9faadcc8 | 10378 | struct file *file; |
2b188cc1 JA |
10379 | int ret; |
10380 | ||
8110c1a6 | 10381 | if (!entries) |
2b188cc1 | 10382 | return -EINVAL; |
8110c1a6 JA |
10383 | if (entries > IORING_MAX_ENTRIES) { |
10384 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10385 | return -EINVAL; | |
10386 | entries = IORING_MAX_ENTRIES; | |
10387 | } | |
2b188cc1 JA |
10388 | |
10389 | /* | |
10390 | * Use twice as many entries for the CQ ring. It's possible for the | |
10391 | * application to drive a higher depth than the size of the SQ ring, | |
10392 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
10393 | * some flexibility in overcommitting a bit. If the application has |
10394 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
10395 | * of CQ ring entries manually. | |
2b188cc1 JA |
10396 | */ |
10397 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
10398 | if (p->flags & IORING_SETUP_CQSIZE) { |
10399 | /* | |
10400 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
10401 | * to a power-of-two, if it isn't already. We do NOT impose | |
10402 | * any cq vs sq ring sizing. | |
10403 | */ | |
eb2667b3 | 10404 | if (!p->cq_entries) |
33a107f0 | 10405 | return -EINVAL; |
8110c1a6 JA |
10406 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
10407 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10408 | return -EINVAL; | |
10409 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
10410 | } | |
eb2667b3 JQ |
10411 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
10412 | if (p->cq_entries < p->sq_entries) | |
10413 | return -EINVAL; | |
33a107f0 JA |
10414 | } else { |
10415 | p->cq_entries = 2 * p->sq_entries; | |
10416 | } | |
2b188cc1 | 10417 | |
2b188cc1 | 10418 | ctx = io_ring_ctx_alloc(p); |
62e398be | 10419 | if (!ctx) |
2b188cc1 | 10420 | return -ENOMEM; |
2b188cc1 | 10421 | ctx->compat = in_compat_syscall(); |
62e398be JA |
10422 | if (!capable(CAP_IPC_LOCK)) |
10423 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
10424 | |
10425 | /* | |
10426 | * This is just grabbed for accounting purposes. When a process exits, | |
10427 | * the mm is exited and dropped before the files, hence we need to hang | |
10428 | * on to this mm purely for the purposes of being able to unaccount | |
10429 | * memory (locked/pinned vm). It's not used for anything else. | |
10430 | */ | |
6b7898eb | 10431 | mmgrab(current->mm); |
2aede0e4 | 10432 | ctx->mm_account = current->mm; |
6b7898eb | 10433 | |
2b188cc1 JA |
10434 | ret = io_allocate_scq_urings(ctx, p); |
10435 | if (ret) | |
10436 | goto err; | |
10437 | ||
7e84e1c7 | 10438 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
10439 | if (ret) |
10440 | goto err; | |
eae071c9 | 10441 | /* always set a rsrc node */ |
47b228ce PB |
10442 | ret = io_rsrc_node_switch_start(ctx); |
10443 | if (ret) | |
10444 | goto err; | |
eae071c9 | 10445 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 10446 | |
2b188cc1 | 10447 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
10448 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
10449 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
10450 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
10451 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
10452 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
10453 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
10454 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
10455 | |
10456 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
10457 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
10458 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
10459 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
10460 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
10461 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
10462 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 10463 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 10464 | |
7f13657d XW |
10465 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
10466 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 10467 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 10468 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
10469 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
10470 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
10471 | |
10472 | if (copy_to_user(params, p, sizeof(*p))) { | |
10473 | ret = -EFAULT; | |
10474 | goto err; | |
10475 | } | |
d1719f70 | 10476 | |
9faadcc8 PB |
10477 | file = io_uring_get_file(ctx); |
10478 | if (IS_ERR(file)) { | |
10479 | ret = PTR_ERR(file); | |
10480 | goto err; | |
10481 | } | |
10482 | ||
044c1ab3 JA |
10483 | /* |
10484 | * Install ring fd as the very last thing, so we don't risk someone | |
10485 | * having closed it before we finish setup | |
10486 | */ | |
9faadcc8 PB |
10487 | ret = io_uring_install_fd(ctx, file); |
10488 | if (ret < 0) { | |
10489 | /* fput will clean it up */ | |
10490 | fput(file); | |
10491 | return ret; | |
10492 | } | |
044c1ab3 | 10493 | |
c826bd7a | 10494 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10495 | return ret; |
10496 | err: | |
10497 | io_ring_ctx_wait_and_kill(ctx); | |
10498 | return ret; | |
10499 | } | |
10500 | ||
10501 | /* | |
10502 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10503 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10504 | * params structure passed in. | |
10505 | */ | |
10506 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10507 | { | |
10508 | struct io_uring_params p; | |
2b188cc1 JA |
10509 | int i; |
10510 | ||
10511 | if (copy_from_user(&p, params, sizeof(p))) | |
10512 | return -EFAULT; | |
10513 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10514 | if (p.resv[i]) | |
10515 | return -EINVAL; | |
10516 | } | |
10517 | ||
6c271ce2 | 10518 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10519 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10520 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10521 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10522 | return -EINVAL; |
10523 | ||
7f13657d | 10524 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10525 | } |
10526 | ||
10527 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10528 | struct io_uring_params __user *, params) | |
10529 | { | |
10530 | return io_uring_setup(entries, params); | |
10531 | } | |
10532 | ||
c072481d PB |
10533 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
10534 | unsigned nr_args) | |
66f4af93 JA |
10535 | { |
10536 | struct io_uring_probe *p; | |
10537 | size_t size; | |
10538 | int i, ret; | |
10539 | ||
10540 | size = struct_size(p, ops, nr_args); | |
10541 | if (size == SIZE_MAX) | |
10542 | return -EOVERFLOW; | |
10543 | p = kzalloc(size, GFP_KERNEL); | |
10544 | if (!p) | |
10545 | return -ENOMEM; | |
10546 | ||
10547 | ret = -EFAULT; | |
10548 | if (copy_from_user(p, arg, size)) | |
10549 | goto out; | |
10550 | ret = -EINVAL; | |
10551 | if (memchr_inv(p, 0, size)) | |
10552 | goto out; | |
10553 | ||
10554 | p->last_op = IORING_OP_LAST - 1; | |
10555 | if (nr_args > IORING_OP_LAST) | |
10556 | nr_args = IORING_OP_LAST; | |
10557 | ||
10558 | for (i = 0; i < nr_args; i++) { | |
10559 | p->ops[i].op = i; | |
10560 | if (!io_op_defs[i].not_supported) | |
10561 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10562 | } | |
10563 | p->ops_len = i; | |
10564 | ||
10565 | ret = 0; | |
10566 | if (copy_to_user(arg, p, size)) | |
10567 | ret = -EFAULT; | |
10568 | out: | |
10569 | kfree(p); | |
10570 | return ret; | |
10571 | } | |
10572 | ||
071698e1 JA |
10573 | static int io_register_personality(struct io_ring_ctx *ctx) |
10574 | { | |
4379bf8b | 10575 | const struct cred *creds; |
61cf9370 | 10576 | u32 id; |
1e6fa521 | 10577 | int ret; |
071698e1 | 10578 | |
4379bf8b | 10579 | creds = get_current_cred(); |
1e6fa521 | 10580 | |
61cf9370 MWO |
10581 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10582 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10583 | if (ret < 0) { |
10584 | put_cred(creds); | |
10585 | return ret; | |
10586 | } | |
10587 | return id; | |
071698e1 JA |
10588 | } |
10589 | ||
c072481d PB |
10590 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
10591 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
10592 | { |
10593 | struct io_uring_restriction *res; | |
10594 | size_t size; | |
10595 | int i, ret; | |
10596 | ||
7e84e1c7 SG |
10597 | /* Restrictions allowed only if rings started disabled */ |
10598 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10599 | return -EBADFD; | |
10600 | ||
21b55dbc | 10601 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10602 | if (ctx->restrictions.registered) |
21b55dbc SG |
10603 | return -EBUSY; |
10604 | ||
10605 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10606 | return -EINVAL; | |
10607 | ||
10608 | size = array_size(nr_args, sizeof(*res)); | |
10609 | if (size == SIZE_MAX) | |
10610 | return -EOVERFLOW; | |
10611 | ||
10612 | res = memdup_user(arg, size); | |
10613 | if (IS_ERR(res)) | |
10614 | return PTR_ERR(res); | |
10615 | ||
10616 | ret = 0; | |
10617 | ||
10618 | for (i = 0; i < nr_args; i++) { | |
10619 | switch (res[i].opcode) { | |
10620 | case IORING_RESTRICTION_REGISTER_OP: | |
10621 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10622 | ret = -EINVAL; | |
10623 | goto out; | |
10624 | } | |
10625 | ||
10626 | __set_bit(res[i].register_op, | |
10627 | ctx->restrictions.register_op); | |
10628 | break; | |
10629 | case IORING_RESTRICTION_SQE_OP: | |
10630 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10631 | ret = -EINVAL; | |
10632 | goto out; | |
10633 | } | |
10634 | ||
10635 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10636 | break; | |
10637 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10638 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10639 | break; | |
10640 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10641 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10642 | break; | |
10643 | default: | |
10644 | ret = -EINVAL; | |
10645 | goto out; | |
10646 | } | |
10647 | } | |
10648 | ||
10649 | out: | |
10650 | /* Reset all restrictions if an error happened */ | |
10651 | if (ret != 0) | |
10652 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10653 | else | |
7e84e1c7 | 10654 | ctx->restrictions.registered = true; |
21b55dbc SG |
10655 | |
10656 | kfree(res); | |
10657 | return ret; | |
10658 | } | |
10659 | ||
7e84e1c7 SG |
10660 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10661 | { | |
10662 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10663 | return -EBADFD; | |
10664 | ||
10665 | if (ctx->restrictions.registered) | |
10666 | ctx->restricted = 1; | |
10667 | ||
0298ef96 PB |
10668 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10669 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10670 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10671 | return 0; |
10672 | } | |
10673 | ||
fdecb662 | 10674 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10675 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10676 | unsigned nr_args) |
10677 | { | |
10678 | __u32 tmp; | |
10679 | int err; | |
10680 | ||
c3bdad02 PB |
10681 | if (up->resv) |
10682 | return -EINVAL; | |
98f0b3b4 PB |
10683 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10684 | return -EOVERFLOW; | |
10685 | err = io_rsrc_node_switch_start(ctx); | |
10686 | if (err) | |
10687 | return err; | |
10688 | ||
fdecb662 PB |
10689 | switch (type) { |
10690 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10691 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10692 | case IORING_RSRC_BUFFER: |
10693 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10694 | } |
10695 | return -EINVAL; | |
10696 | } | |
10697 | ||
c3bdad02 PB |
10698 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10699 | unsigned nr_args) | |
98f0b3b4 | 10700 | { |
c3bdad02 | 10701 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10702 | |
10703 | if (!nr_args) | |
10704 | return -EINVAL; | |
c3bdad02 PB |
10705 | memset(&up, 0, sizeof(up)); |
10706 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10707 | return -EFAULT; | |
10708 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10709 | } | |
10710 | ||
10711 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10712 | unsigned size, unsigned type) |
c3bdad02 PB |
10713 | { |
10714 | struct io_uring_rsrc_update2 up; | |
10715 | ||
10716 | if (size != sizeof(up)) | |
10717 | return -EINVAL; | |
98f0b3b4 PB |
10718 | if (copy_from_user(&up, arg, sizeof(up))) |
10719 | return -EFAULT; | |
992da01a | 10720 | if (!up.nr || up.resv) |
98f0b3b4 | 10721 | return -EINVAL; |
992da01a | 10722 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10723 | } |
10724 | ||
c072481d | 10725 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10726 | unsigned int size, unsigned int type) |
792e3582 PB |
10727 | { |
10728 | struct io_uring_rsrc_register rr; | |
10729 | ||
10730 | /* keep it extendible */ | |
10731 | if (size != sizeof(rr)) | |
10732 | return -EINVAL; | |
10733 | ||
10734 | memset(&rr, 0, sizeof(rr)); | |
10735 | if (copy_from_user(&rr, arg, size)) | |
10736 | return -EFAULT; | |
992da01a | 10737 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10738 | return -EINVAL; |
10739 | ||
992da01a | 10740 | switch (type) { |
792e3582 PB |
10741 | case IORING_RSRC_FILE: |
10742 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10743 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10744 | case IORING_RSRC_BUFFER: |
10745 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10746 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10747 | } |
10748 | return -EINVAL; | |
10749 | } | |
10750 | ||
c072481d PB |
10751 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
10752 | void __user *arg, unsigned len) | |
fe76421d JA |
10753 | { |
10754 | struct io_uring_task *tctx = current->io_uring; | |
10755 | cpumask_var_t new_mask; | |
10756 | int ret; | |
10757 | ||
10758 | if (!tctx || !tctx->io_wq) | |
10759 | return -EINVAL; | |
10760 | ||
10761 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10762 | return -ENOMEM; | |
10763 | ||
10764 | cpumask_clear(new_mask); | |
10765 | if (len > cpumask_size()) | |
10766 | len = cpumask_size(); | |
10767 | ||
10768 | if (copy_from_user(new_mask, arg, len)) { | |
10769 | free_cpumask_var(new_mask); | |
10770 | return -EFAULT; | |
10771 | } | |
10772 | ||
10773 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10774 | free_cpumask_var(new_mask); | |
10775 | return ret; | |
10776 | } | |
10777 | ||
c072481d | 10778 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
10779 | { |
10780 | struct io_uring_task *tctx = current->io_uring; | |
10781 | ||
10782 | if (!tctx || !tctx->io_wq) | |
10783 | return -EINVAL; | |
10784 | ||
10785 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10786 | } | |
10787 | ||
c072481d PB |
10788 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10789 | void __user *arg) | |
b22fa62a | 10790 | __must_hold(&ctx->uring_lock) |
2e480058 | 10791 | { |
b22fa62a | 10792 | struct io_tctx_node *node; |
fa84693b JA |
10793 | struct io_uring_task *tctx = NULL; |
10794 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
10795 | __u32 new_count[2]; |
10796 | int i, ret; | |
10797 | ||
2e480058 JA |
10798 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
10799 | return -EFAULT; | |
10800 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10801 | if (new_count[i] > INT_MAX) | |
10802 | return -EINVAL; | |
10803 | ||
fa84693b JA |
10804 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
10805 | sqd = ctx->sq_data; | |
10806 | if (sqd) { | |
009ad9f0 JA |
10807 | /* |
10808 | * Observe the correct sqd->lock -> ctx->uring_lock | |
10809 | * ordering. Fine to drop uring_lock here, we hold | |
10810 | * a ref to the ctx. | |
10811 | */ | |
41d3a6bd | 10812 | refcount_inc(&sqd->refs); |
009ad9f0 | 10813 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 10814 | mutex_lock(&sqd->lock); |
009ad9f0 | 10815 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
10816 | if (sqd->thread) |
10817 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
10818 | } |
10819 | } else { | |
10820 | tctx = current->io_uring; | |
10821 | } | |
10822 | ||
e139a1ec | 10823 | BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); |
fa84693b | 10824 | |
bad119b9 PB |
10825 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
10826 | if (new_count[i]) | |
10827 | ctx->iowq_limits[i] = new_count[i]; | |
e139a1ec PB |
10828 | ctx->iowq_limits_set = true; |
10829 | ||
e139a1ec PB |
10830 | if (tctx && tctx->io_wq) { |
10831 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
10832 | if (ret) | |
10833 | goto err; | |
10834 | } else { | |
10835 | memset(new_count, 0, sizeof(new_count)); | |
10836 | } | |
fa84693b | 10837 | |
41d3a6bd | 10838 | if (sqd) { |
fa84693b | 10839 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10840 | io_put_sq_data(sqd); |
10841 | } | |
2e480058 JA |
10842 | |
10843 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10844 | return -EFAULT; | |
10845 | ||
b22fa62a PB |
10846 | /* that's it for SQPOLL, only the SQPOLL task creates requests */ |
10847 | if (sqd) | |
10848 | return 0; | |
10849 | ||
10850 | /* now propagate the restriction to all registered users */ | |
10851 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
10852 | struct io_uring_task *tctx = node->task->io_uring; | |
10853 | ||
10854 | if (WARN_ON_ONCE(!tctx->io_wq)) | |
10855 | continue; | |
10856 | ||
10857 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10858 | new_count[i] = ctx->iowq_limits[i]; | |
10859 | /* ignore errors, it always returns zero anyway */ | |
10860 | (void)io_wq_max_workers(tctx->io_wq, new_count); | |
10861 | } | |
2e480058 | 10862 | return 0; |
fa84693b | 10863 | err: |
41d3a6bd | 10864 | if (sqd) { |
fa84693b | 10865 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10866 | io_put_sq_data(sqd); |
10867 | } | |
fa84693b | 10868 | return ret; |
2e480058 JA |
10869 | } |
10870 | ||
071698e1 JA |
10871 | static bool io_register_op_must_quiesce(int op) |
10872 | { | |
10873 | switch (op) { | |
bd54b6fe BM |
10874 | case IORING_REGISTER_BUFFERS: |
10875 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10876 | case IORING_REGISTER_FILES: |
071698e1 JA |
10877 | case IORING_UNREGISTER_FILES: |
10878 | case IORING_REGISTER_FILES_UPDATE: | |
10879 | case IORING_REGISTER_PROBE: | |
10880 | case IORING_REGISTER_PERSONALITY: | |
10881 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10882 | case IORING_REGISTER_FILES2: |
10883 | case IORING_REGISTER_FILES_UPDATE2: | |
10884 | case IORING_REGISTER_BUFFERS2: | |
10885 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10886 | case IORING_REGISTER_IOWQ_AFF: |
10887 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10888 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10889 | return false; |
10890 | default: | |
10891 | return true; | |
10892 | } | |
10893 | } | |
10894 | ||
c072481d | 10895 | static __cold int io_ctx_quiesce(struct io_ring_ctx *ctx) |
e73c5c7c PB |
10896 | { |
10897 | long ret; | |
10898 | ||
10899 | percpu_ref_kill(&ctx->refs); | |
10900 | ||
10901 | /* | |
10902 | * Drop uring mutex before waiting for references to exit. If another | |
10903 | * thread is currently inside io_uring_enter() it might need to grab the | |
10904 | * uring_lock to make progress. If we hold it here across the drain | |
10905 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10906 | * no new references will come in after we've killed the percpu ref. | |
10907 | */ | |
10908 | mutex_unlock(&ctx->uring_lock); | |
10909 | do { | |
37f0e767 PB |
10910 | ret = wait_for_completion_interruptible_timeout(&ctx->ref_comp, HZ); |
10911 | if (ret) { | |
10912 | ret = min(0L, ret); | |
e73c5c7c | 10913 | break; |
37f0e767 PB |
10914 | } |
10915 | ||
e73c5c7c | 10916 | ret = io_run_task_work_sig(); |
37f0e767 | 10917 | io_req_caches_free(ctx); |
e73c5c7c PB |
10918 | } while (ret >= 0); |
10919 | mutex_lock(&ctx->uring_lock); | |
10920 | ||
10921 | if (ret) | |
10922 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10923 | return ret; | |
10924 | } | |
10925 | ||
edafccee JA |
10926 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10927 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10928 | __releases(ctx->uring_lock) |
10929 | __acquires(ctx->uring_lock) | |
edafccee JA |
10930 | { |
10931 | int ret; | |
10932 | ||
35fa71a0 JA |
10933 | /* |
10934 | * We're inside the ring mutex, if the ref is already dying, then | |
10935 | * someone else killed the ctx or is already going through | |
10936 | * io_uring_register(). | |
10937 | */ | |
10938 | if (percpu_ref_is_dying(&ctx->refs)) | |
10939 | return -ENXIO; | |
10940 | ||
75c4021a PB |
10941 | if (ctx->restricted) { |
10942 | if (opcode >= IORING_REGISTER_LAST) | |
10943 | return -EINVAL; | |
10944 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10945 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10946 | return -EACCES; | |
10947 | } | |
10948 | ||
071698e1 | 10949 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10950 | ret = io_ctx_quiesce(ctx); |
10951 | if (ret) | |
f70865db | 10952 | return ret; |
05f3fb3c | 10953 | } |
edafccee JA |
10954 | |
10955 | switch (opcode) { | |
10956 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10957 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10958 | break; |
10959 | case IORING_UNREGISTER_BUFFERS: | |
10960 | ret = -EINVAL; | |
10961 | if (arg || nr_args) | |
10962 | break; | |
0a96bbe4 | 10963 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10964 | break; |
6b06314c | 10965 | case IORING_REGISTER_FILES: |
792e3582 | 10966 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10967 | break; |
10968 | case IORING_UNREGISTER_FILES: | |
10969 | ret = -EINVAL; | |
10970 | if (arg || nr_args) | |
10971 | break; | |
10972 | ret = io_sqe_files_unregister(ctx); | |
10973 | break; | |
c3a31e60 | 10974 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10975 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10976 | break; |
9b402849 | 10977 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10978 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10979 | ret = -EINVAL; |
10980 | if (nr_args != 1) | |
10981 | break; | |
10982 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10983 | if (ret) |
10984 | break; | |
10985 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10986 | ctx->eventfd_async = 1; | |
10987 | else | |
10988 | ctx->eventfd_async = 0; | |
9b402849 JA |
10989 | break; |
10990 | case IORING_UNREGISTER_EVENTFD: | |
10991 | ret = -EINVAL; | |
10992 | if (arg || nr_args) | |
10993 | break; | |
10994 | ret = io_eventfd_unregister(ctx); | |
10995 | break; | |
66f4af93 JA |
10996 | case IORING_REGISTER_PROBE: |
10997 | ret = -EINVAL; | |
10998 | if (!arg || nr_args > 256) | |
10999 | break; | |
11000 | ret = io_probe(ctx, arg, nr_args); | |
11001 | break; | |
071698e1 JA |
11002 | case IORING_REGISTER_PERSONALITY: |
11003 | ret = -EINVAL; | |
11004 | if (arg || nr_args) | |
11005 | break; | |
11006 | ret = io_register_personality(ctx); | |
11007 | break; | |
11008 | case IORING_UNREGISTER_PERSONALITY: | |
11009 | ret = -EINVAL; | |
11010 | if (arg) | |
11011 | break; | |
11012 | ret = io_unregister_personality(ctx, nr_args); | |
11013 | break; | |
7e84e1c7 SG |
11014 | case IORING_REGISTER_ENABLE_RINGS: |
11015 | ret = -EINVAL; | |
11016 | if (arg || nr_args) | |
11017 | break; | |
11018 | ret = io_register_enable_rings(ctx); | |
11019 | break; | |
21b55dbc SG |
11020 | case IORING_REGISTER_RESTRICTIONS: |
11021 | ret = io_register_restrictions(ctx, arg, nr_args); | |
11022 | break; | |
992da01a PB |
11023 | case IORING_REGISTER_FILES2: |
11024 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
11025 | break; | |
11026 | case IORING_REGISTER_FILES_UPDATE2: | |
11027 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11028 | IORING_RSRC_FILE); | |
11029 | break; | |
11030 | case IORING_REGISTER_BUFFERS2: | |
11031 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 11032 | break; |
992da01a PB |
11033 | case IORING_REGISTER_BUFFERS_UPDATE: |
11034 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11035 | IORING_RSRC_BUFFER); | |
c3bdad02 | 11036 | break; |
fe76421d JA |
11037 | case IORING_REGISTER_IOWQ_AFF: |
11038 | ret = -EINVAL; | |
11039 | if (!arg || !nr_args) | |
11040 | break; | |
11041 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
11042 | break; | |
11043 | case IORING_UNREGISTER_IOWQ_AFF: | |
11044 | ret = -EINVAL; | |
11045 | if (arg || nr_args) | |
11046 | break; | |
11047 | ret = io_unregister_iowq_aff(ctx); | |
11048 | break; | |
2e480058 JA |
11049 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
11050 | ret = -EINVAL; | |
11051 | if (!arg || nr_args != 2) | |
11052 | break; | |
11053 | ret = io_register_iowq_max_workers(ctx, arg); | |
11054 | break; | |
edafccee JA |
11055 | default: |
11056 | ret = -EINVAL; | |
11057 | break; | |
11058 | } | |
11059 | ||
071698e1 | 11060 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 11061 | /* bring the ctx back to life */ |
05f3fb3c | 11062 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 11063 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 11064 | } |
edafccee JA |
11065 | return ret; |
11066 | } | |
11067 | ||
11068 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
11069 | void __user *, arg, unsigned int, nr_args) | |
11070 | { | |
11071 | struct io_ring_ctx *ctx; | |
11072 | long ret = -EBADF; | |
11073 | struct fd f; | |
11074 | ||
11075 | f = fdget(fd); | |
11076 | if (!f.file) | |
11077 | return -EBADF; | |
11078 | ||
11079 | ret = -EOPNOTSUPP; | |
11080 | if (f.file->f_op != &io_uring_fops) | |
11081 | goto out_fput; | |
11082 | ||
11083 | ctx = f.file->private_data; | |
11084 | ||
b6c23dd5 PB |
11085 | io_run_task_work(); |
11086 | ||
edafccee JA |
11087 | mutex_lock(&ctx->uring_lock); |
11088 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
11089 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
11090 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
11091 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
11092 | out_fput: |
11093 | fdput(f); | |
11094 | return ret; | |
11095 | } | |
11096 | ||
2b188cc1 JA |
11097 | static int __init io_uring_init(void) |
11098 | { | |
d7f62e82 SM |
11099 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
11100 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
11101 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
11102 | } while (0) | |
11103 | ||
11104 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
11105 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
11106 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
11107 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
11108 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
11109 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
11110 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
11111 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
11112 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
11113 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 11114 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
11115 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
11116 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
11117 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
11118 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
11119 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
11120 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
11121 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
11122 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
11123 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
11124 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
11125 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
11126 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
11127 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
11128 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
11129 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 11130 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
11131 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
11132 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 11133 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 11134 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 11135 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 11136 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 11137 | |
b0d658ec PB |
11138 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
11139 | sizeof(struct io_uring_rsrc_update)); | |
11140 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
11141 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
11142 | |
11143 | /* ->buf_index is u16 */ | |
11144 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
11145 | ||
b0d658ec PB |
11146 | /* should fit into one byte */ |
11147 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
11148 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
11149 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 11150 | |
d3656344 | 11151 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 11152 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 11153 | |
91f245d5 JA |
11154 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
11155 | SLAB_ACCOUNT); | |
2b188cc1 JA |
11156 | return 0; |
11157 | }; | |
11158 | __initcall(io_uring_init); |