Commit | Line | Data |
---|---|---|
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> | |
edce22e1 | 60 | #include <linux/blk-mq.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> |
5bd2182d | 81 | #include <linux/audit.h> |
cdc1404a | 82 | #include <linux/security.h> |
2b188cc1 | 83 | |
c826bd7a DD |
84 | #define CREATE_TRACE_POINTS |
85 | #include <trace/events/io_uring.h> | |
86 | ||
2b188cc1 JA |
87 | #include <uapi/linux/io_uring.h> |
88 | ||
89 | #include "internal.h" | |
561fb04a | 90 | #include "io-wq.h" |
2b188cc1 | 91 | |
5277deaa | 92 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 93 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 94 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 95 | |
187f08c1 | 96 | /* only define max */ |
042b0d85 | 97 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
98 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
99 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 100 | |
187f08c1 | 101 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
102 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
103 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
104 | ||
489809e2 PB |
105 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
106 | ||
68fe256a PB |
107 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
108 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) | |
109 | ||
5562a8d7 PB |
110 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS | IOSQE_BUFFER_SELECT | \ |
111 | IOSQE_IO_DRAIN | IOSQE_CQE_SKIP_SUCCESS) | |
68fe256a | 112 | |
c854357b | 113 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
d5361233 | 114 | REQ_F_POLLED | REQ_F_CREDS | REQ_F_ASYNC_DATA) |
b16fed66 | 115 | |
09899b19 PB |
116 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
117 | ||
2b188cc1 JA |
118 | struct io_uring { |
119 | u32 head ____cacheline_aligned_in_smp; | |
120 | u32 tail ____cacheline_aligned_in_smp; | |
121 | }; | |
122 | ||
1e84b97b | 123 | /* |
75b28aff HV |
124 | * This data is shared with the application through the mmap at offsets |
125 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
126 | * |
127 | * The offsets to the member fields are published through struct | |
128 | * io_sqring_offsets when calling io_uring_setup. | |
129 | */ | |
75b28aff | 130 | struct io_rings { |
1e84b97b SB |
131 | /* |
132 | * Head and tail offsets into the ring; the offsets need to be | |
133 | * masked to get valid indices. | |
134 | * | |
75b28aff HV |
135 | * The kernel controls head of the sq ring and the tail of the cq ring, |
136 | * and the application controls tail of the sq ring and the head of the | |
137 | * cq ring. | |
1e84b97b | 138 | */ |
75b28aff | 139 | struct io_uring sq, cq; |
1e84b97b | 140 | /* |
75b28aff | 141 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
142 | * ring_entries - 1) |
143 | */ | |
75b28aff HV |
144 | u32 sq_ring_mask, cq_ring_mask; |
145 | /* Ring sizes (constant, power of 2) */ | |
146 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
147 | /* |
148 | * Number of invalid entries dropped by the kernel due to | |
149 | * invalid index stored in array | |
150 | * | |
151 | * Written by the kernel, shouldn't be modified by the | |
152 | * application (i.e. get number of "new events" by comparing to | |
153 | * cached value). | |
154 | * | |
155 | * After a new SQ head value was read by the application this | |
156 | * counter includes all submissions that were dropped reaching | |
157 | * the new SQ head (and possibly more). | |
158 | */ | |
75b28aff | 159 | u32 sq_dropped; |
1e84b97b | 160 | /* |
0d9b5b3a | 161 | * Runtime SQ flags |
1e84b97b SB |
162 | * |
163 | * Written by the kernel, shouldn't be modified by the | |
164 | * application. | |
165 | * | |
166 | * The application needs a full memory barrier before checking | |
167 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
168 | */ | |
75b28aff | 169 | u32 sq_flags; |
0d9b5b3a SG |
170 | /* |
171 | * Runtime CQ flags | |
172 | * | |
173 | * Written by the application, shouldn't be modified by the | |
174 | * kernel. | |
175 | */ | |
fe7e3257 | 176 | u32 cq_flags; |
1e84b97b SB |
177 | /* |
178 | * Number of completion events lost because the queue was full; | |
179 | * this should be avoided by the application by making sure | |
0b4295b5 | 180 | * there are not more requests pending than there is space in |
1e84b97b SB |
181 | * the completion queue. |
182 | * | |
183 | * Written by the kernel, shouldn't be modified by the | |
184 | * application (i.e. get number of "new events" by comparing to | |
185 | * cached value). | |
186 | * | |
187 | * As completion events come in out of order this counter is not | |
188 | * ordered with any other data. | |
189 | */ | |
75b28aff | 190 | u32 cq_overflow; |
1e84b97b SB |
191 | /* |
192 | * Ring buffer of completion events. | |
193 | * | |
194 | * The kernel writes completion events fresh every time they are | |
195 | * produced, so the application is allowed to modify pending | |
196 | * entries. | |
197 | */ | |
75b28aff | 198 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
199 | }; |
200 | ||
45d189c6 | 201 | enum io_uring_cmd_flags { |
51aac424 | 202 | IO_URING_F_COMPLETE_DEFER = 1, |
3b44b371 | 203 | IO_URING_F_UNLOCKED = 2, |
51aac424 PB |
204 | /* int's last bit, sign checks are usually faster than a bit test */ |
205 | IO_URING_F_NONBLOCK = INT_MIN, | |
45d189c6 PB |
206 | }; |
207 | ||
edafccee JA |
208 | struct io_mapped_ubuf { |
209 | u64 ubuf; | |
4751f53d | 210 | u64 ubuf_end; |
edafccee | 211 | unsigned int nr_bvecs; |
de293938 | 212 | unsigned long acct_pages; |
41edf1a5 | 213 | struct bio_vec bvec[]; |
edafccee JA |
214 | }; |
215 | ||
50238531 BM |
216 | struct io_ring_ctx; |
217 | ||
6c2450ae PB |
218 | struct io_overflow_cqe { |
219 | struct io_uring_cqe cqe; | |
220 | struct list_head list; | |
221 | }; | |
222 | ||
a04b0ac0 PB |
223 | struct io_fixed_file { |
224 | /* file * with additional FFS_* flags */ | |
225 | unsigned long file_ptr; | |
226 | }; | |
227 | ||
269bbe5f BM |
228 | struct io_rsrc_put { |
229 | struct list_head list; | |
b60c8dce | 230 | u64 tag; |
50238531 BM |
231 | union { |
232 | void *rsrc; | |
233 | struct file *file; | |
bd54b6fe | 234 | struct io_mapped_ubuf *buf; |
50238531 | 235 | }; |
269bbe5f BM |
236 | }; |
237 | ||
aeca241b | 238 | struct io_file_table { |
042b0d85 | 239 | struct io_fixed_file *files; |
31b51510 JA |
240 | }; |
241 | ||
b895c9a6 | 242 | struct io_rsrc_node { |
05589553 XW |
243 | struct percpu_ref refs; |
244 | struct list_head node; | |
269bbe5f | 245 | struct list_head rsrc_list; |
b895c9a6 | 246 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 247 | struct llist_node llist; |
e297822b | 248 | bool done; |
05589553 XW |
249 | }; |
250 | ||
40ae0ff7 PB |
251 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
252 | ||
b895c9a6 | 253 | struct io_rsrc_data { |
05f3fb3c JA |
254 | struct io_ring_ctx *ctx; |
255 | ||
2d091d62 PB |
256 | u64 **tags; |
257 | unsigned int nr; | |
40ae0ff7 | 258 | rsrc_put_fn *do_put; |
3e942498 | 259 | atomic_t refs; |
05f3fb3c | 260 | struct completion done; |
8bad28d8 | 261 | bool quiesce; |
05f3fb3c JA |
262 | }; |
263 | ||
dbc7d452 JA |
264 | struct io_buffer_list { |
265 | struct list_head list; | |
266 | struct list_head buf_list; | |
267 | __u16 bgid; | |
268 | }; | |
269 | ||
5a2e745d JA |
270 | struct io_buffer { |
271 | struct list_head list; | |
272 | __u64 addr; | |
d1f82808 | 273 | __u32 len; |
5a2e745d | 274 | __u16 bid; |
b1c62645 | 275 | __u16 bgid; |
5a2e745d JA |
276 | }; |
277 | ||
21b55dbc SG |
278 | struct io_restriction { |
279 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
280 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
281 | u8 sqe_flags_allowed; | |
282 | u8 sqe_flags_required; | |
7e84e1c7 | 283 | bool registered; |
21b55dbc SG |
284 | }; |
285 | ||
37d1e2e3 JA |
286 | enum { |
287 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
288 | IO_SQ_THREAD_SHOULD_PARK, | |
289 | }; | |
290 | ||
534ca6d6 JA |
291 | struct io_sq_data { |
292 | refcount_t refs; | |
9e138a48 | 293 | atomic_t park_pending; |
09a6f4ef | 294 | struct mutex lock; |
69fb2131 JA |
295 | |
296 | /* ctx's that are using this sqd */ | |
297 | struct list_head ctx_list; | |
69fb2131 | 298 | |
534ca6d6 JA |
299 | struct task_struct *thread; |
300 | struct wait_queue_head wait; | |
08369246 XW |
301 | |
302 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
303 | int sq_cpu; |
304 | pid_t task_pid; | |
5c2469e0 | 305 | pid_t task_tgid; |
37d1e2e3 JA |
306 | |
307 | unsigned long state; | |
37d1e2e3 | 308 | struct completion exited; |
534ca6d6 JA |
309 | }; |
310 | ||
6dd0be1e | 311 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 312 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 313 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 314 | |
a1ab7b35 PB |
315 | struct io_submit_link { |
316 | struct io_kiocb *head; | |
317 | struct io_kiocb *last; | |
318 | }; | |
319 | ||
258b29a9 | 320 | struct io_submit_state { |
5a158c6b PB |
321 | /* inline/task_work completion list, under ->uring_lock */ |
322 | struct io_wq_work_node free_list; | |
323 | /* batch completion logic */ | |
324 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 325 | struct io_submit_link link; |
258b29a9 | 326 | |
258b29a9 | 327 | bool plug_started; |
4b628aeb | 328 | bool need_plug; |
3d4aeb9f | 329 | bool flush_cqes; |
5ca7a8b3 | 330 | unsigned short submit_nr; |
5a158c6b | 331 | struct blk_plug plug; |
258b29a9 PB |
332 | }; |
333 | ||
77bc59b4 UA |
334 | struct io_ev_fd { |
335 | struct eventfd_ctx *cq_ev_fd; | |
c75312dd | 336 | unsigned int eventfd_async: 1; |
77bc59b4 UA |
337 | struct rcu_head rcu; |
338 | }; | |
339 | ||
dbc7d452 JA |
340 | #define IO_BUFFERS_HASH_BITS 5 |
341 | ||
2b188cc1 | 342 | struct io_ring_ctx { |
b52ecf8c | 343 | /* const or read-mostly hot data */ |
2b188cc1 JA |
344 | struct { |
345 | struct percpu_ref refs; | |
2b188cc1 | 346 | |
b52ecf8c | 347 | struct io_rings *rings; |
2b188cc1 | 348 | unsigned int flags; |
e1d85334 | 349 | unsigned int compat: 1; |
e1d85334 | 350 | unsigned int drain_next: 1; |
21b55dbc | 351 | unsigned int restricted: 1; |
f18ee4cf | 352 | unsigned int off_timeout_used: 1; |
10c66904 | 353 | unsigned int drain_active: 1; |
5562a8d7 | 354 | unsigned int drain_disabled: 1; |
9aa8dfde | 355 | unsigned int has_evfd: 1; |
b52ecf8c | 356 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 357 | |
7f1129d2 | 358 | /* submission data */ |
b52ecf8c | 359 | struct { |
0499e582 PB |
360 | struct mutex uring_lock; |
361 | ||
75b28aff HV |
362 | /* |
363 | * Ring buffer of indices into array of io_uring_sqe, which is | |
364 | * mmapped by the application using the IORING_OFF_SQES offset. | |
365 | * | |
366 | * This indirection could e.g. be used to assign fixed | |
367 | * io_uring_sqe entries to operations and only submit them to | |
368 | * the queue when needed. | |
369 | * | |
370 | * The kernel modifies neither the indices array nor the entries | |
371 | * array. | |
372 | */ | |
373 | u32 *sq_array; | |
c7af47cf | 374 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
375 | unsigned cached_sq_head; |
376 | unsigned sq_entries; | |
de0617e4 | 377 | struct list_head defer_list; |
7f1129d2 PB |
378 | |
379 | /* | |
380 | * Fixed resources fast path, should be accessed only under | |
381 | * uring_lock, and updated through io_uring_register(2) | |
382 | */ | |
383 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 384 | int rsrc_cached_refs; |
7f1129d2 PB |
385 | struct io_file_table file_table; |
386 | unsigned nr_user_files; | |
387 | unsigned nr_user_bufs; | |
388 | struct io_mapped_ubuf **user_bufs; | |
389 | ||
390 | struct io_submit_state submit_state; | |
5262f567 | 391 | struct list_head timeout_list; |
ef9dd637 | 392 | struct list_head ltimeout_list; |
1d7bb1d5 | 393 | struct list_head cq_overflow_list; |
dbc7d452 | 394 | struct list_head *io_buffers; |
cc3cec83 | 395 | struct list_head io_buffers_cache; |
4d9237e3 | 396 | struct list_head apoll_cache; |
7f1129d2 PB |
397 | struct xarray personalities; |
398 | u32 pers_next; | |
399 | unsigned sq_thread_idle; | |
2b188cc1 JA |
400 | } ____cacheline_aligned_in_smp; |
401 | ||
d0acdee2 | 402 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 403 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 404 | unsigned int locked_free_nr; |
3c1a2ead | 405 | |
7c30f36a | 406 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
407 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
408 | ||
90554200 | 409 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 410 | struct list_head sqd_list; |
75b28aff | 411 | |
5ed7a37d PB |
412 | unsigned long check_cq_overflow; |
413 | ||
206aefde JA |
414 | struct { |
415 | unsigned cached_cq_tail; | |
416 | unsigned cq_entries; | |
77bc59b4 | 417 | struct io_ev_fd __rcu *io_ev_fd; |
0499e582 PB |
418 | struct wait_queue_head cq_wait; |
419 | unsigned cq_extra; | |
420 | atomic_t cq_timeouts; | |
0499e582 | 421 | unsigned cq_last_tm_flush; |
206aefde | 422 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 423 | |
2b188cc1 JA |
424 | struct { |
425 | spinlock_t completion_lock; | |
e94f141b | 426 | |
89850fce JA |
427 | spinlock_t timeout_lock; |
428 | ||
def596e9 | 429 | /* |
540e32a0 | 430 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
431 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
432 | * For SQPOLL, only the single threaded io_sq_thread() will | |
433 | * manipulate the list, hence no extra locking is needed there. | |
434 | */ | |
5eef4e87 | 435 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
436 | struct hlist_head *cancel_hash; |
437 | unsigned cancel_hash_bits; | |
915b3dde | 438 | bool poll_multi_queue; |
cc3cec83 JA |
439 | |
440 | struct list_head io_buffers_comp; | |
2b188cc1 | 441 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 442 | |
21b55dbc | 443 | struct io_restriction restrictions; |
3c1a2ead | 444 | |
b13a8918 PB |
445 | /* slow path rsrc auxilary data, used by update/register */ |
446 | struct { | |
447 | struct io_rsrc_node *rsrc_backup_node; | |
448 | struct io_mapped_ubuf *dummy_ubuf; | |
449 | struct io_rsrc_data *file_data; | |
450 | struct io_rsrc_data *buf_data; | |
451 | ||
452 | struct delayed_work rsrc_put_work; | |
453 | struct llist_head rsrc_put_llist; | |
454 | struct list_head rsrc_ref_list; | |
455 | spinlock_t rsrc_ref_lock; | |
cc3cec83 JA |
456 | |
457 | struct list_head io_buffers_pages; | |
b13a8918 PB |
458 | }; |
459 | ||
3c1a2ead | 460 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
461 | struct { |
462 | #if defined(CONFIG_UNIX) | |
463 | struct socket *ring_sock; | |
464 | #endif | |
465 | /* hashed buffered write serialization */ | |
466 | struct io_wq_hash *hash_map; | |
467 | ||
468 | /* Only used for accounting purposes */ | |
469 | struct user_struct *user; | |
470 | struct mm_struct *mm_account; | |
471 | ||
472 | /* ctx exit and cancelation */ | |
9011bf9a PB |
473 | struct llist_head fallback_llist; |
474 | struct delayed_work fallback_work; | |
b986af7e PB |
475 | struct work_struct exit_work; |
476 | struct list_head tctx_list; | |
477 | struct completion ref_comp; | |
e139a1ec PB |
478 | u32 iowq_limits[2]; |
479 | bool iowq_limits_set; | |
b986af7e | 480 | }; |
2b188cc1 JA |
481 | }; |
482 | ||
e7a6c00d JA |
483 | /* |
484 | * Arbitrary limit, can be raised if need be | |
485 | */ | |
486 | #define IO_RINGFD_REG_MAX 16 | |
487 | ||
53e043b2 SM |
488 | struct io_uring_task { |
489 | /* submission side */ | |
09899b19 | 490 | int cached_refs; |
53e043b2 SM |
491 | struct xarray xa; |
492 | struct wait_queue_head wait; | |
ee53fb2b SM |
493 | const struct io_ring_ctx *last; |
494 | struct io_wq *io_wq; | |
53e043b2 SM |
495 | struct percpu_counter inflight; |
496 | atomic_t in_idle; | |
53e043b2 SM |
497 | |
498 | spinlock_t task_lock; | |
499 | struct io_wq_work_list task_list; | |
4813c377 | 500 | struct io_wq_work_list prior_task_list; |
53e043b2 | 501 | struct callback_head task_work; |
e7a6c00d | 502 | struct file **registered_rings; |
6294f368 | 503 | bool task_running; |
53e043b2 SM |
504 | }; |
505 | ||
09bb8394 JA |
506 | /* |
507 | * First field must be the file pointer in all the | |
508 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
509 | */ | |
221c5eb2 JA |
510 | struct io_poll_iocb { |
511 | struct file *file; | |
018043be | 512 | struct wait_queue_head *head; |
221c5eb2 | 513 | __poll_t events; |
392edb45 | 514 | struct wait_queue_entry wait; |
221c5eb2 JA |
515 | }; |
516 | ||
9d805892 | 517 | struct io_poll_update { |
018043be | 518 | struct file *file; |
9d805892 PB |
519 | u64 old_user_data; |
520 | u64 new_user_data; | |
521 | __poll_t events; | |
b69de288 JA |
522 | bool update_events; |
523 | bool update_user_data; | |
018043be PB |
524 | }; |
525 | ||
b5dba59e JA |
526 | struct io_close { |
527 | struct file *file; | |
b5dba59e | 528 | int fd; |
7df778be | 529 | u32 file_slot; |
b5dba59e JA |
530 | }; |
531 | ||
ad8a48ac JA |
532 | struct io_timeout_data { |
533 | struct io_kiocb *req; | |
534 | struct hrtimer timer; | |
535 | struct timespec64 ts; | |
536 | enum hrtimer_mode mode; | |
50c1df2b | 537 | u32 flags; |
ad8a48ac JA |
538 | }; |
539 | ||
8ed8d3c3 JA |
540 | struct io_accept { |
541 | struct file *file; | |
542 | struct sockaddr __user *addr; | |
543 | int __user *addr_len; | |
544 | int flags; | |
aaa4db12 | 545 | u32 file_slot; |
09952e3e | 546 | unsigned long nofile; |
8ed8d3c3 JA |
547 | }; |
548 | ||
549 | struct io_sync { | |
550 | struct file *file; | |
551 | loff_t len; | |
552 | loff_t off; | |
553 | int flags; | |
d63d1b5e | 554 | int mode; |
8ed8d3c3 JA |
555 | }; |
556 | ||
fbf23849 JA |
557 | struct io_cancel { |
558 | struct file *file; | |
559 | u64 addr; | |
560 | }; | |
561 | ||
b29472ee JA |
562 | struct io_timeout { |
563 | struct file *file; | |
bfe68a22 PB |
564 | u32 off; |
565 | u32 target_seq; | |
135fcde8 | 566 | struct list_head list; |
90cd7e42 PB |
567 | /* head of the link, used by linked timeouts only */ |
568 | struct io_kiocb *head; | |
89b263f6 JA |
569 | /* for linked completions */ |
570 | struct io_kiocb *prev; | |
b29472ee JA |
571 | }; |
572 | ||
0bdf7a2d PB |
573 | struct io_timeout_rem { |
574 | struct file *file; | |
575 | u64 addr; | |
9c8e11b3 PB |
576 | |
577 | /* timeout update */ | |
578 | struct timespec64 ts; | |
579 | u32 flags; | |
f1042b6c | 580 | bool ltimeout; |
0bdf7a2d PB |
581 | }; |
582 | ||
9adbd45d JA |
583 | struct io_rw { |
584 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
585 | struct kiocb kiocb; | |
586 | u64 addr; | |
584b0180 JA |
587 | u32 len; |
588 | u32 flags; | |
9adbd45d JA |
589 | }; |
590 | ||
3fbb51c1 JA |
591 | struct io_connect { |
592 | struct file *file; | |
593 | struct sockaddr __user *addr; | |
594 | int addr_len; | |
595 | }; | |
596 | ||
e47293fd JA |
597 | struct io_sr_msg { |
598 | struct file *file; | |
fddaface | 599 | union { |
4af3417a PB |
600 | struct compat_msghdr __user *umsg_compat; |
601 | struct user_msghdr __user *umsg; | |
602 | void __user *buf; | |
fddaface | 603 | }; |
e47293fd | 604 | int msg_flags; |
bcda7baa | 605 | int bgid; |
fddaface | 606 | size_t len; |
7ba89d2a | 607 | size_t done_io; |
e47293fd JA |
608 | }; |
609 | ||
15b71abe JA |
610 | struct io_open { |
611 | struct file *file; | |
612 | int dfd; | |
b9445598 | 613 | u32 file_slot; |
15b71abe | 614 | struct filename *filename; |
c12cedf2 | 615 | struct open_how how; |
4022e7af | 616 | unsigned long nofile; |
15b71abe JA |
617 | }; |
618 | ||
269bbe5f | 619 | struct io_rsrc_update { |
05f3fb3c JA |
620 | struct file *file; |
621 | u64 arg; | |
622 | u32 nr_args; | |
623 | u32 offset; | |
624 | }; | |
625 | ||
4840e418 JA |
626 | struct io_fadvise { |
627 | struct file *file; | |
628 | u64 offset; | |
629 | u32 len; | |
630 | u32 advice; | |
631 | }; | |
632 | ||
c1ca757b JA |
633 | struct io_madvise { |
634 | struct file *file; | |
635 | u64 addr; | |
636 | u32 len; | |
637 | u32 advice; | |
638 | }; | |
639 | ||
3e4827b0 JA |
640 | struct io_epoll { |
641 | struct file *file; | |
642 | int epfd; | |
643 | int op; | |
644 | int fd; | |
645 | struct epoll_event event; | |
e47293fd JA |
646 | }; |
647 | ||
7d67af2c PB |
648 | struct io_splice { |
649 | struct file *file_out; | |
7d67af2c PB |
650 | loff_t off_out; |
651 | loff_t off_in; | |
652 | u64 len; | |
a3e4bc23 | 653 | int splice_fd_in; |
7d67af2c PB |
654 | unsigned int flags; |
655 | }; | |
656 | ||
ddf0322d JA |
657 | struct io_provide_buf { |
658 | struct file *file; | |
659 | __u64 addr; | |
38134ada | 660 | __u32 len; |
ddf0322d JA |
661 | __u32 bgid; |
662 | __u16 nbufs; | |
663 | __u16 bid; | |
664 | }; | |
665 | ||
1d9e1288 BM |
666 | struct io_statx { |
667 | struct file *file; | |
668 | int dfd; | |
669 | unsigned int mask; | |
670 | unsigned int flags; | |
1b6fe6e0 | 671 | struct filename *filename; |
1d9e1288 BM |
672 | struct statx __user *buffer; |
673 | }; | |
674 | ||
36f4fa68 JA |
675 | struct io_shutdown { |
676 | struct file *file; | |
677 | int how; | |
678 | }; | |
679 | ||
80a261fd JA |
680 | struct io_rename { |
681 | struct file *file; | |
682 | int old_dfd; | |
683 | int new_dfd; | |
684 | struct filename *oldpath; | |
685 | struct filename *newpath; | |
686 | int flags; | |
687 | }; | |
688 | ||
14a1143b JA |
689 | struct io_unlink { |
690 | struct file *file; | |
691 | int dfd; | |
692 | int flags; | |
693 | struct filename *filename; | |
694 | }; | |
695 | ||
e34a02dc DK |
696 | struct io_mkdir { |
697 | struct file *file; | |
698 | int dfd; | |
699 | umode_t mode; | |
700 | struct filename *filename; | |
701 | }; | |
702 | ||
7a8721f8 DK |
703 | struct io_symlink { |
704 | struct file *file; | |
705 | int new_dfd; | |
706 | struct filename *oldpath; | |
707 | struct filename *newpath; | |
708 | }; | |
709 | ||
cf30da90 DK |
710 | struct io_hardlink { |
711 | struct file *file; | |
712 | int old_dfd; | |
713 | int new_dfd; | |
714 | struct filename *oldpath; | |
715 | struct filename *newpath; | |
716 | int flags; | |
717 | }; | |
718 | ||
4f57f06c JA |
719 | struct io_msg { |
720 | struct file *file; | |
721 | u64 user_data; | |
722 | u32 len; | |
723 | }; | |
724 | ||
f499a021 JA |
725 | struct io_async_connect { |
726 | struct sockaddr_storage address; | |
727 | }; | |
728 | ||
03b1230c JA |
729 | struct io_async_msghdr { |
730 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
731 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
732 | struct iovec *free_iov; | |
03b1230c JA |
733 | struct sockaddr __user *uaddr; |
734 | struct msghdr msg; | |
b537916c | 735 | struct sockaddr_storage addr; |
03b1230c JA |
736 | }; |
737 | ||
538941e2 | 738 | struct io_rw_state { |
ff6165b2 | 739 | struct iov_iter iter; |
cd658695 | 740 | struct iov_iter_state iter_state; |
c88598a9 | 741 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
742 | }; |
743 | ||
744 | struct io_async_rw { | |
745 | struct io_rw_state s; | |
746 | const struct iovec *free_iovec; | |
227c0c96 | 747 | size_t bytes_done; |
bcf5a063 | 748 | struct wait_page_queue wpq; |
f67676d1 JA |
749 | }; |
750 | ||
6b47ee6e PB |
751 | enum { |
752 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
753 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
754 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
755 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
756 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 757 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
04c76b41 | 758 | REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT, |
6b47ee6e | 759 | |
dddca226 | 760 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 761 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
762 | REQ_F_INFLIGHT_BIT, |
763 | REQ_F_CUR_POS_BIT, | |
764 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 765 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 766 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 767 | REQ_F_POLLED_BIT, |
bcda7baa | 768 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 769 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 770 | REQ_F_REISSUE_BIT, |
b8e64b53 | 771 | REQ_F_CREDS_BIT, |
20e60a38 | 772 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 773 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 774 | REQ_F_ASYNC_DATA_BIT, |
04c76b41 | 775 | REQ_F_SKIP_LINK_CQES_BIT, |
91eac1c6 JA |
776 | REQ_F_SINGLE_POLL_BIT, |
777 | REQ_F_DOUBLE_POLL_BIT, | |
8a3e8ee5 | 778 | REQ_F_PARTIAL_IO_BIT, |
7b29f92d | 779 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 780 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 781 | REQ_F_ISREG_BIT, |
84557871 JA |
782 | |
783 | /* not a real bit, just to check we're not overflowing the space */ | |
784 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
785 | }; |
786 | ||
787 | enum { | |
788 | /* ctx owns file */ | |
789 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
790 | /* drain existing IO first */ | |
791 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
792 | /* linked sqes */ | |
793 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
794 | /* doesn't sever on completion < 0 */ | |
795 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
796 | /* IOSQE_ASYNC */ | |
797 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
798 | /* IOSQE_BUFFER_SELECT */ |
799 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
04c76b41 PB |
800 | /* IOSQE_CQE_SKIP_SUCCESS */ |
801 | REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT), | |
6b47ee6e | 802 | |
6b47ee6e | 803 | /* fail rest of links */ |
93d2bcd2 | 804 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 805 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
806 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
807 | /* read/write uses file position */ | |
808 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
809 | /* must not punt to workers */ | |
810 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 811 | /* has or had linked timeout */ |
6b47ee6e | 812 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
813 | /* needs cleanup */ |
814 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
815 | /* already went through poll handler */ |
816 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
817 | /* buffer already selected */ |
818 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
819 | /* completion is deferred through io_comp_state */ |
820 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
821 | /* caller should reissue async */ |
822 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
823 | /* supports async reads/writes */ |
824 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
825 | /* regular file */ |
826 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
827 | /* has creds assigned */ |
828 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
829 | /* skip refcounting if not set */ |
830 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
831 | /* there is a linked timeout that has to be armed */ |
832 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
833 | /* ->async_data allocated */ |
834 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
04c76b41 PB |
835 | /* don't post CQEs while failing linked requests */ |
836 | REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT), | |
91eac1c6 JA |
837 | /* single poll may be active */ |
838 | REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT), | |
839 | /* double poll may active */ | |
840 | REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT), | |
8a3e8ee5 JA |
841 | /* request has already done partial IO */ |
842 | REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT), | |
d7718a9d JA |
843 | }; |
844 | ||
845 | struct async_poll { | |
846 | struct io_poll_iocb poll; | |
807abcb0 | 847 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
848 | }; |
849 | ||
f237c30a | 850 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 851 | |
7cbf1722 | 852 | struct io_task_work { |
5b0a6acc PB |
853 | union { |
854 | struct io_wq_work_node node; | |
855 | struct llist_node fallback_node; | |
856 | }; | |
857 | io_req_tw_func_t func; | |
7cbf1722 JA |
858 | }; |
859 | ||
992da01a PB |
860 | enum { |
861 | IORING_RSRC_FILE = 0, | |
862 | IORING_RSRC_BUFFER = 1, | |
863 | }; | |
864 | ||
09bb8394 JA |
865 | /* |
866 | * NOTE! Each of the iocb union members has the file pointer | |
867 | * as the first entry in their struct definition. So you can | |
868 | * access the file pointer through any of the sub-structs, | |
63c36549 | 869 | * or directly as just 'file' in this struct. |
09bb8394 | 870 | */ |
2b188cc1 | 871 | struct io_kiocb { |
221c5eb2 | 872 | union { |
09bb8394 | 873 | struct file *file; |
9adbd45d | 874 | struct io_rw rw; |
221c5eb2 | 875 | struct io_poll_iocb poll; |
9d805892 | 876 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
877 | struct io_accept accept; |
878 | struct io_sync sync; | |
fbf23849 | 879 | struct io_cancel cancel; |
b29472ee | 880 | struct io_timeout timeout; |
0bdf7a2d | 881 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 882 | struct io_connect connect; |
e47293fd | 883 | struct io_sr_msg sr_msg; |
15b71abe | 884 | struct io_open open; |
b5dba59e | 885 | struct io_close close; |
269bbe5f | 886 | struct io_rsrc_update rsrc_update; |
4840e418 | 887 | struct io_fadvise fadvise; |
c1ca757b | 888 | struct io_madvise madvise; |
3e4827b0 | 889 | struct io_epoll epoll; |
7d67af2c | 890 | struct io_splice splice; |
ddf0322d | 891 | struct io_provide_buf pbuf; |
1d9e1288 | 892 | struct io_statx statx; |
36f4fa68 | 893 | struct io_shutdown shutdown; |
80a261fd | 894 | struct io_rename rename; |
14a1143b | 895 | struct io_unlink unlink; |
e34a02dc | 896 | struct io_mkdir mkdir; |
7a8721f8 | 897 | struct io_symlink symlink; |
cf30da90 | 898 | struct io_hardlink hardlink; |
4f57f06c | 899 | struct io_msg msg; |
221c5eb2 | 900 | }; |
2b188cc1 | 901 | |
d625c6ee | 902 | u8 opcode; |
65a6543d XW |
903 | /* polled IO has completed */ |
904 | u8 iopoll_completed; | |
4f4eeba8 | 905 | u16 buf_index; |
d17e56eb PB |
906 | unsigned int flags; |
907 | ||
908 | u64 user_data; | |
9cf7c104 | 909 | u32 result; |
d17e56eb | 910 | u32 cflags; |
4f4eeba8 | 911 | |
010e8e6b | 912 | struct io_ring_ctx *ctx; |
010e8e6b | 913 | struct task_struct *task; |
d7718a9d | 914 | |
269bbe5f | 915 | struct percpu_ref *fixed_rsrc_refs; |
d886e185 PB |
916 | /* store used ubuf, so we can prevent reloading */ |
917 | struct io_mapped_ubuf *imu; | |
fcb323cc | 918 | |
7e3709d5 | 919 | /* used by request caches, completion batching and iopoll */ |
ef05d9eb | 920 | struct io_wq_work_node comp_list; |
d17e56eb | 921 | atomic_t refs; |
521d61fc | 922 | atomic_t poll_refs; |
5b0a6acc | 923 | struct io_task_work io_task_work; |
010e8e6b PB |
924 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
925 | struct hlist_node hash_node; | |
7e3709d5 | 926 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 927 | struct async_poll *apoll; |
d886e185 PB |
928 | /* opcode allocated if it needs to store data for async defer */ |
929 | void *async_data; | |
7e3709d5 | 930 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ |
30d51dd4 | 931 | struct io_buffer *kbuf; |
41cdcc22 | 932 | /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */ |
34d2bfe7 | 933 | struct io_kiocb *link; |
41cdcc22 | 934 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
521d61fc JA |
935 | const struct cred *creds; |
936 | struct io_wq_work work; | |
2b188cc1 | 937 | }; |
05589553 | 938 | |
13bf43f5 PB |
939 | struct io_tctx_node { |
940 | struct list_head ctx_node; | |
941 | struct task_struct *task; | |
13bf43f5 PB |
942 | struct io_ring_ctx *ctx; |
943 | }; | |
944 | ||
27dc8338 PB |
945 | struct io_defer_entry { |
946 | struct list_head list; | |
947 | struct io_kiocb *req; | |
9cf7c104 | 948 | u32 seq; |
2b188cc1 JA |
949 | }; |
950 | ||
d3656344 | 951 | struct io_op_def { |
d3656344 JA |
952 | /* needs req->file assigned */ |
953 | unsigned needs_file : 1; | |
6d63416d PB |
954 | /* should block plug */ |
955 | unsigned plug : 1; | |
d3656344 JA |
956 | /* hash wq insertion if file is a regular file */ |
957 | unsigned hash_reg_file : 1; | |
958 | /* unbound wq insertion if file is a non-regular file */ | |
959 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
960 | /* set if opcode supports polled "wait" */ |
961 | unsigned pollin : 1; | |
962 | unsigned pollout : 1; | |
52dd8640 | 963 | unsigned poll_exclusive : 1; |
bcda7baa JA |
964 | /* op supports buffer selection */ |
965 | unsigned buffer_select : 1; | |
26f0505a PB |
966 | /* do prep async if is going to be punted */ |
967 | unsigned needs_async_setup : 1; | |
6d63416d PB |
968 | /* opcode is not supported by this kernel */ |
969 | unsigned not_supported : 1; | |
5bd2182d PM |
970 | /* skip auditing */ |
971 | unsigned audit_skip : 1; | |
e8c2bc1f JA |
972 | /* size of async data needed, if any */ |
973 | unsigned short async_size; | |
d3656344 JA |
974 | }; |
975 | ||
0918682b | 976 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
977 | [IORING_OP_NOP] = {}, |
978 | [IORING_OP_READV] = { | |
d3656344 JA |
979 | .needs_file = 1, |
980 | .unbound_nonreg_file = 1, | |
8a72758c | 981 | .pollin = 1, |
4d954c25 | 982 | .buffer_select = 1, |
26f0505a | 983 | .needs_async_setup = 1, |
27926b68 | 984 | .plug = 1, |
5bd2182d | 985 | .audit_skip = 1, |
e8c2bc1f | 986 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 987 | }, |
0463b6c5 | 988 | [IORING_OP_WRITEV] = { |
d3656344 JA |
989 | .needs_file = 1, |
990 | .hash_reg_file = 1, | |
991 | .unbound_nonreg_file = 1, | |
8a72758c | 992 | .pollout = 1, |
26f0505a | 993 | .needs_async_setup = 1, |
27926b68 | 994 | .plug = 1, |
5bd2182d | 995 | .audit_skip = 1, |
e8c2bc1f | 996 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 997 | }, |
0463b6c5 | 998 | [IORING_OP_FSYNC] = { |
d3656344 | 999 | .needs_file = 1, |
5bd2182d | 1000 | .audit_skip = 1, |
d3656344 | 1001 | }, |
0463b6c5 | 1002 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
1003 | .needs_file = 1, |
1004 | .unbound_nonreg_file = 1, | |
8a72758c | 1005 | .pollin = 1, |
27926b68 | 1006 | .plug = 1, |
5bd2182d | 1007 | .audit_skip = 1, |
e8c2bc1f | 1008 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1009 | }, |
0463b6c5 | 1010 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
1011 | .needs_file = 1, |
1012 | .hash_reg_file = 1, | |
1013 | .unbound_nonreg_file = 1, | |
8a72758c | 1014 | .pollout = 1, |
27926b68 | 1015 | .plug = 1, |
5bd2182d | 1016 | .audit_skip = 1, |
e8c2bc1f | 1017 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1018 | }, |
0463b6c5 | 1019 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
1020 | .needs_file = 1, |
1021 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1022 | .audit_skip = 1, |
1023 | }, | |
1024 | [IORING_OP_POLL_REMOVE] = { | |
1025 | .audit_skip = 1, | |
d3656344 | 1026 | }, |
0463b6c5 | 1027 | [IORING_OP_SYNC_FILE_RANGE] = { |
d3656344 | 1028 | .needs_file = 1, |
5bd2182d | 1029 | .audit_skip = 1, |
d3656344 | 1030 | }, |
0463b6c5 | 1031 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
1032 | .needs_file = 1, |
1033 | .unbound_nonreg_file = 1, | |
8a72758c | 1034 | .pollout = 1, |
26f0505a | 1035 | .needs_async_setup = 1, |
e8c2bc1f | 1036 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1037 | }, |
0463b6c5 | 1038 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
1039 | .needs_file = 1, |
1040 | .unbound_nonreg_file = 1, | |
8a72758c | 1041 | .pollin = 1, |
52de1fe1 | 1042 | .buffer_select = 1, |
26f0505a | 1043 | .needs_async_setup = 1, |
e8c2bc1f | 1044 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1045 | }, |
0463b6c5 | 1046 | [IORING_OP_TIMEOUT] = { |
5bd2182d | 1047 | .audit_skip = 1, |
e8c2bc1f | 1048 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1049 | }, |
9c8e11b3 PB |
1050 | [IORING_OP_TIMEOUT_REMOVE] = { |
1051 | /* used by timeout updates' prep() */ | |
5bd2182d | 1052 | .audit_skip = 1, |
9c8e11b3 | 1053 | }, |
0463b6c5 | 1054 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
1055 | .needs_file = 1, |
1056 | .unbound_nonreg_file = 1, | |
8a72758c | 1057 | .pollin = 1, |
52dd8640 | 1058 | .poll_exclusive = 1, |
d3656344 | 1059 | }, |
5bd2182d PM |
1060 | [IORING_OP_ASYNC_CANCEL] = { |
1061 | .audit_skip = 1, | |
1062 | }, | |
0463b6c5 | 1063 | [IORING_OP_LINK_TIMEOUT] = { |
5bd2182d | 1064 | .audit_skip = 1, |
e8c2bc1f | 1065 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1066 | }, |
0463b6c5 | 1067 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1068 | .needs_file = 1, |
1069 | .unbound_nonreg_file = 1, | |
8a72758c | 1070 | .pollout = 1, |
26f0505a | 1071 | .needs_async_setup = 1, |
e8c2bc1f | 1072 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1073 | }, |
0463b6c5 | 1074 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1075 | .needs_file = 1, |
d3656344 | 1076 | }, |
44526bed JA |
1077 | [IORING_OP_OPENAT] = {}, |
1078 | [IORING_OP_CLOSE] = {}, | |
5bd2182d PM |
1079 | [IORING_OP_FILES_UPDATE] = { |
1080 | .audit_skip = 1, | |
1081 | }, | |
1082 | [IORING_OP_STATX] = { | |
1083 | .audit_skip = 1, | |
1084 | }, | |
0463b6c5 | 1085 | [IORING_OP_READ] = { |
3a6820f2 JA |
1086 | .needs_file = 1, |
1087 | .unbound_nonreg_file = 1, | |
8a72758c | 1088 | .pollin = 1, |
bcda7baa | 1089 | .buffer_select = 1, |
27926b68 | 1090 | .plug = 1, |
5bd2182d | 1091 | .audit_skip = 1, |
e8c2bc1f | 1092 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1093 | }, |
0463b6c5 | 1094 | [IORING_OP_WRITE] = { |
3a6820f2 | 1095 | .needs_file = 1, |
7b3188e7 | 1096 | .hash_reg_file = 1, |
3a6820f2 | 1097 | .unbound_nonreg_file = 1, |
8a72758c | 1098 | .pollout = 1, |
27926b68 | 1099 | .plug = 1, |
5bd2182d | 1100 | .audit_skip = 1, |
e8c2bc1f | 1101 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1102 | }, |
0463b6c5 | 1103 | [IORING_OP_FADVISE] = { |
4840e418 | 1104 | .needs_file = 1, |
5bd2182d | 1105 | .audit_skip = 1, |
c1ca757b | 1106 | }, |
44526bed | 1107 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1108 | [IORING_OP_SEND] = { |
fddaface JA |
1109 | .needs_file = 1, |
1110 | .unbound_nonreg_file = 1, | |
8a72758c | 1111 | .pollout = 1, |
5bd2182d | 1112 | .audit_skip = 1, |
fddaface | 1113 | }, |
0463b6c5 | 1114 | [IORING_OP_RECV] = { |
fddaface JA |
1115 | .needs_file = 1, |
1116 | .unbound_nonreg_file = 1, | |
8a72758c | 1117 | .pollin = 1, |
bcda7baa | 1118 | .buffer_select = 1, |
5bd2182d | 1119 | .audit_skip = 1, |
fddaface | 1120 | }, |
0463b6c5 | 1121 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1122 | }, |
3e4827b0 JA |
1123 | [IORING_OP_EPOLL_CTL] = { |
1124 | .unbound_nonreg_file = 1, | |
5bd2182d | 1125 | .audit_skip = 1, |
3e4827b0 | 1126 | }, |
7d67af2c PB |
1127 | [IORING_OP_SPLICE] = { |
1128 | .needs_file = 1, | |
1129 | .hash_reg_file = 1, | |
1130 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1131 | .audit_skip = 1, |
1132 | }, | |
1133 | [IORING_OP_PROVIDE_BUFFERS] = { | |
1134 | .audit_skip = 1, | |
1135 | }, | |
1136 | [IORING_OP_REMOVE_BUFFERS] = { | |
1137 | .audit_skip = 1, | |
ddf0322d | 1138 | }, |
f2a8d5c7 PB |
1139 | [IORING_OP_TEE] = { |
1140 | .needs_file = 1, | |
1141 | .hash_reg_file = 1, | |
1142 | .unbound_nonreg_file = 1, | |
5bd2182d | 1143 | .audit_skip = 1, |
f2a8d5c7 | 1144 | }, |
36f4fa68 JA |
1145 | [IORING_OP_SHUTDOWN] = { |
1146 | .needs_file = 1, | |
1147 | }, | |
44526bed JA |
1148 | [IORING_OP_RENAMEAT] = {}, |
1149 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1150 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1151 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1152 | [IORING_OP_LINKAT] = {}, |
4f57f06c JA |
1153 | [IORING_OP_MSG_RING] = { |
1154 | .needs_file = 1, | |
1155 | }, | |
d3656344 JA |
1156 | }; |
1157 | ||
0756a869 PB |
1158 | /* requests with any of those set should undergo io_disarm_next() */ |
1159 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1160 | ||
7a612350 | 1161 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1162 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1163 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1164 | struct task_struct *task, | |
3dd0c97a | 1165 | bool cancel_all); |
78cc687b | 1166 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1167 | |
913a571a PB |
1168 | static void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags); |
1169 | ||
ec9c02ad | 1170 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1171 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1172 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1173 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1174 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1175 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1176 | unsigned nr_args); |
68fb8979 | 1177 | static void io_clean_op(struct io_kiocb *req); |
5106dd6e JA |
1178 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
1179 | unsigned issue_flags); | |
1180 | static inline struct file *io_file_get_normal(struct io_kiocb *req, int fd); | |
d5361233 JA |
1181 | static void io_drop_inflight_file(struct io_kiocb *req); |
1182 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags); | |
c5eef2b9 | 1183 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1184 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1185 | |
907d1df3 | 1186 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1187 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1188 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1189 | |
b9445598 PB |
1190 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1191 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1192 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1193 | ||
f1042b6c | 1194 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
9aa8dfde | 1195 | static void io_eventfd_signal(struct io_ring_ctx *ctx); |
b9445598 | 1196 | |
2b188cc1 JA |
1197 | static struct kmem_cache *req_cachep; |
1198 | ||
0918682b | 1199 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1200 | |
1201 | struct sock *io_uring_get_socket(struct file *file) | |
1202 | { | |
1203 | #if defined(CONFIG_UNIX) | |
1204 | if (file->f_op == &io_uring_fops) { | |
1205 | struct io_ring_ctx *ctx = file->private_data; | |
1206 | ||
1207 | return ctx->ring_sock->sk; | |
1208 | } | |
1209 | #endif | |
1210 | return NULL; | |
1211 | } | |
1212 | EXPORT_SYMBOL(io_uring_get_socket); | |
1213 | ||
f237c30a PB |
1214 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1215 | { | |
1216 | if (!*locked) { | |
1217 | mutex_lock(&ctx->uring_lock); | |
1218 | *locked = true; | |
1219 | } | |
1220 | } | |
1221 | ||
f2f87370 PB |
1222 | #define io_for_each_link(pos, head) \ |
1223 | for (pos = (head); pos; pos = pos->link) | |
1224 | ||
21c843d5 PB |
1225 | /* |
1226 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1227 | * see commit f958d7b528b1 for details. | |
1228 | */ | |
1229 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1230 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1231 | ||
1232 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1233 | { | |
20e60a38 | 1234 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1235 | return atomic_inc_not_zero(&req->refs); |
1236 | } | |
1237 | ||
21c843d5 PB |
1238 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1239 | { | |
20e60a38 PB |
1240 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1241 | return true; | |
1242 | ||
21c843d5 PB |
1243 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1244 | return atomic_dec_and_test(&req->refs); | |
1245 | } | |
1246 | ||
21c843d5 PB |
1247 | static inline void req_ref_get(struct io_kiocb *req) |
1248 | { | |
20e60a38 | 1249 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1250 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1251 | atomic_inc(&req->refs); | |
1252 | } | |
1253 | ||
c450178d PB |
1254 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1255 | { | |
6f33b0bc | 1256 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1257 | __io_submit_flush_completions(ctx); |
1258 | } | |
1259 | ||
48dcd38d | 1260 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1261 | { |
1262 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1263 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1264 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1265 | } |
1266 | } | |
1267 | ||
48dcd38d PB |
1268 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1269 | { | |
1270 | __io_req_set_refcount(req, 1); | |
1271 | } | |
1272 | ||
ab409402 PB |
1273 | #define IO_RSRC_REF_BATCH 100 |
1274 | ||
1275 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, | |
1276 | struct io_ring_ctx *ctx) | |
1277 | __must_hold(&ctx->uring_lock) | |
36f72fe2 | 1278 | { |
ab409402 PB |
1279 | struct percpu_ref *ref = req->fixed_rsrc_refs; |
1280 | ||
1281 | if (ref) { | |
1282 | if (ref == &ctx->rsrc_node->refs) | |
1283 | ctx->rsrc_cached_refs++; | |
1284 | else | |
1285 | percpu_ref_put(ref); | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | static inline void io_req_put_rsrc(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1290 | { | |
1291 | if (req->fixed_rsrc_refs) | |
1292 | percpu_ref_put(req->fixed_rsrc_refs); | |
1293 | } | |
1294 | ||
1295 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1296 | __must_hold(&ctx->uring_lock) | |
1297 | { | |
1298 | if (ctx->rsrc_cached_refs) { | |
1299 | percpu_ref_put_many(&ctx->rsrc_node->refs, ctx->rsrc_cached_refs); | |
1300 | ctx->rsrc_cached_refs = 0; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1305 | __must_hold(&ctx->uring_lock) | |
1306 | { | |
1307 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1308 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1309 | } | |
36f72fe2 | 1310 | |
a46be971 | 1311 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
5106dd6e JA |
1312 | struct io_ring_ctx *ctx, |
1313 | unsigned int issue_flags) | |
36f72fe2 | 1314 | { |
269bbe5f | 1315 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1316 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
5106dd6e JA |
1317 | |
1318 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1319 | lockdep_assert_held(&ctx->uring_lock); | |
1320 | ctx->rsrc_cached_refs--; | |
1321 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1322 | io_rsrc_refs_refill(ctx); | |
1323 | } else { | |
1324 | percpu_ref_get(req->fixed_rsrc_refs); | |
1325 | } | |
36f72fe2 PB |
1326 | } |
1327 | } | |
1328 | ||
cc3cec83 | 1329 | static unsigned int __io_put_kbuf(struct io_kiocb *req, struct list_head *list) |
3648e526 | 1330 | { |
d1fd1c20 | 1331 | struct io_buffer *kbuf = req->kbuf; |
3648e526 HX |
1332 | unsigned int cflags; |
1333 | ||
cc3cec83 | 1334 | cflags = IORING_CQE_F_BUFFER | (kbuf->bid << IORING_CQE_BUFFER_SHIFT); |
3648e526 | 1335 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
cc3cec83 | 1336 | list_add(&kbuf->list, list); |
d1fd1c20 | 1337 | req->kbuf = NULL; |
3648e526 HX |
1338 | return cflags; |
1339 | } | |
1340 | ||
cc3cec83 | 1341 | static inline unsigned int io_put_kbuf_comp(struct io_kiocb *req) |
3648e526 | 1342 | { |
8197b053 PB |
1343 | lockdep_assert_held(&req->ctx->completion_lock); |
1344 | ||
3648e526 HX |
1345 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
1346 | return 0; | |
cc3cec83 JA |
1347 | return __io_put_kbuf(req, &req->ctx->io_buffers_comp); |
1348 | } | |
1349 | ||
1350 | static inline unsigned int io_put_kbuf(struct io_kiocb *req, | |
1351 | unsigned issue_flags) | |
1352 | { | |
1353 | unsigned int cflags; | |
1354 | ||
1355 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1356 | return 0; | |
1357 | ||
1358 | /* | |
1359 | * We can add this buffer back to two lists: | |
1360 | * | |
1361 | * 1) The io_buffers_cache list. This one is protected by the | |
1362 | * ctx->uring_lock. If we already hold this lock, add back to this | |
1363 | * list as we can grab it from issue as well. | |
1364 | * 2) The io_buffers_comp list. This one is protected by the | |
1365 | * ctx->completion_lock. | |
1366 | * | |
1367 | * We migrate buffers from the comp_list to the issue cache list | |
1368 | * when we need one. | |
1369 | */ | |
1370 | if (issue_flags & IO_URING_F_UNLOCKED) { | |
1371 | struct io_ring_ctx *ctx = req->ctx; | |
1372 | ||
1373 | spin_lock(&ctx->completion_lock); | |
1374 | cflags = __io_put_kbuf(req, &ctx->io_buffers_comp); | |
1375 | spin_unlock(&ctx->completion_lock); | |
1376 | } else { | |
ab0ac095 PB |
1377 | lockdep_assert_held(&req->ctx->uring_lock); |
1378 | ||
cc3cec83 JA |
1379 | cflags = __io_put_kbuf(req, &req->ctx->io_buffers_cache); |
1380 | } | |
1381 | ||
1382 | return cflags; | |
3648e526 HX |
1383 | } |
1384 | ||
dbc7d452 JA |
1385 | static struct io_buffer_list *io_buffer_get_list(struct io_ring_ctx *ctx, |
1386 | unsigned int bgid) | |
1387 | { | |
1388 | struct list_head *hash_list; | |
1389 | struct io_buffer_list *bl; | |
1390 | ||
1391 | hash_list = &ctx->io_buffers[hash_32(bgid, IO_BUFFERS_HASH_BITS)]; | |
1392 | list_for_each_entry(bl, hash_list, list) | |
1393 | if (bl->bgid == bgid || bgid == -1U) | |
1394 | return bl; | |
1395 | ||
1396 | return NULL; | |
1397 | } | |
1398 | ||
4d55f238 | 1399 | static void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) |
b1c62645 JA |
1400 | { |
1401 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 JA |
1402 | struct io_buffer_list *bl; |
1403 | struct io_buffer *buf; | |
b1c62645 JA |
1404 | |
1405 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1406 | return; | |
8a3e8ee5 JA |
1407 | /* don't recycle if we already did IO to this buffer */ |
1408 | if (req->flags & REQ_F_PARTIAL_IO) | |
1409 | return; | |
b1c62645 | 1410 | |
4d55f238 JA |
1411 | if (issue_flags & IO_URING_F_UNLOCKED) |
1412 | mutex_lock(&ctx->uring_lock); | |
b1c62645 JA |
1413 | |
1414 | lockdep_assert_held(&ctx->uring_lock); | |
1415 | ||
1416 | buf = req->kbuf; | |
dbc7d452 JA |
1417 | bl = io_buffer_get_list(ctx, buf->bgid); |
1418 | list_add(&buf->list, &bl->buf_list); | |
b1c62645 JA |
1419 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
1420 | req->kbuf = NULL; | |
4d55f238 JA |
1421 | |
1422 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1423 | mutex_unlock(&ctx->uring_lock); | |
b1c62645 JA |
1424 | } |
1425 | ||
3dd0c97a PB |
1426 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1427 | bool cancel_all) | |
6af3f48b | 1428 | __must_hold(&req->ctx->timeout_lock) |
08d23634 | 1429 | { |
68207680 | 1430 | if (task && head->task != task) |
08d23634 | 1431 | return false; |
d5361233 | 1432 | return cancel_all; |
6af3f48b PB |
1433 | } |
1434 | ||
1435 | /* | |
1436 | * As io_match_task() but protected against racing with linked timeouts. | |
1437 | * User must not hold timeout_lock. | |
1438 | */ | |
1439 | static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, | |
1440 | bool cancel_all) | |
1441 | { | |
6af3f48b PB |
1442 | if (task && head->task != task) |
1443 | return false; | |
d5361233 | 1444 | return cancel_all; |
6af3f48b PB |
1445 | } |
1446 | ||
d886e185 PB |
1447 | static inline bool req_has_async_data(struct io_kiocb *req) |
1448 | { | |
1449 | return req->flags & REQ_F_ASYNC_DATA; | |
1450 | } | |
1451 | ||
93d2bcd2 | 1452 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1453 | { |
93d2bcd2 | 1454 | req->flags |= REQ_F_FAIL; |
04c76b41 PB |
1455 | if (req->flags & REQ_F_CQE_SKIP) { |
1456 | req->flags &= ~REQ_F_CQE_SKIP; | |
1457 | req->flags |= REQ_F_SKIP_LINK_CQES; | |
1458 | } | |
c40f6379 | 1459 | } |
4a38aed2 | 1460 | |
a8295b98 HX |
1461 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1462 | { | |
1463 | req_set_fail(req); | |
1464 | req->result = res; | |
1465 | } | |
1466 | ||
c072481d | 1467 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1468 | { |
1469 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1470 | ||
0f158b4c | 1471 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1472 | } |
1473 | ||
8eb7e2d0 PB |
1474 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1475 | { | |
1476 | return !req->timeout.off; | |
1477 | } | |
1478 | ||
c072481d | 1479 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1480 | { |
1481 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1482 | fallback_work.work); | |
1483 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1484 | struct io_kiocb *req, *tmp; | |
f237c30a | 1485 | bool locked = false; |
f56165e6 PB |
1486 | |
1487 | percpu_ref_get(&ctx->refs); | |
1488 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1489 | req->io_task_work.func(req, &locked); |
5636c00d | 1490 | |
f237c30a | 1491 | if (locked) { |
c450178d | 1492 | io_submit_flush_completions(ctx); |
f237c30a PB |
1493 | mutex_unlock(&ctx->uring_lock); |
1494 | } | |
f56165e6 PB |
1495 | percpu_ref_put(&ctx->refs); |
1496 | } | |
1497 | ||
c072481d | 1498 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1499 | { |
1500 | struct io_ring_ctx *ctx; | |
dbc7d452 | 1501 | int i, hash_bits; |
2b188cc1 JA |
1502 | |
1503 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1504 | if (!ctx) | |
1505 | return NULL; | |
1506 | ||
78076bb6 JA |
1507 | /* |
1508 | * Use 5 bits less than the max cq entries, that should give us around | |
1509 | * 32 entries per hash list if totally full and uniformly spread. | |
1510 | */ | |
1511 | hash_bits = ilog2(p->cq_entries); | |
1512 | hash_bits -= 5; | |
1513 | if (hash_bits <= 0) | |
1514 | hash_bits = 1; | |
1515 | ctx->cancel_hash_bits = hash_bits; | |
1516 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1517 | GFP_KERNEL); | |
1518 | if (!ctx->cancel_hash) | |
1519 | goto err; | |
1520 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1521 | ||
6224843d PB |
1522 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1523 | if (!ctx->dummy_ubuf) | |
1524 | goto err; | |
1525 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1526 | ctx->dummy_ubuf->ubuf = -1UL; | |
1527 | ||
dbc7d452 JA |
1528 | ctx->io_buffers = kcalloc(1U << IO_BUFFERS_HASH_BITS, |
1529 | sizeof(struct list_head), GFP_KERNEL); | |
1530 | if (!ctx->io_buffers) | |
1531 | goto err; | |
1532 | for (i = 0; i < (1U << IO_BUFFERS_HASH_BITS); i++) | |
1533 | INIT_LIST_HEAD(&ctx->io_buffers[i]); | |
1534 | ||
21482896 | 1535 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1536 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1537 | goto err; | |
2b188cc1 JA |
1538 | |
1539 | ctx->flags = p->flags; | |
90554200 | 1540 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1541 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1542 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
cc3cec83 | 1543 | INIT_LIST_HEAD(&ctx->io_buffers_cache); |
4d9237e3 | 1544 | INIT_LIST_HEAD(&ctx->apoll_cache); |
0f158b4c | 1545 | init_completion(&ctx->ref_comp); |
61cf9370 | 1546 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1547 | mutex_init(&ctx->uring_lock); |
311997b3 | 1548 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1549 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1550 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1551 | INIT_WQ_LIST(&ctx->iopoll_list); |
cc3cec83 JA |
1552 | INIT_LIST_HEAD(&ctx->io_buffers_pages); |
1553 | INIT_LIST_HEAD(&ctx->io_buffers_comp); | |
de0617e4 | 1554 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1555 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1556 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1557 | spin_lock_init(&ctx->rsrc_ref_lock); |
1558 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1559 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1560 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1561 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1562 | ctx->submit_state.free_list.next = NULL; |
1563 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1564 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1565 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1566 | return ctx; |
206aefde | 1567 | err: |
6224843d | 1568 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1569 | kfree(ctx->cancel_hash); |
dbc7d452 | 1570 | kfree(ctx->io_buffers); |
206aefde JA |
1571 | kfree(ctx); |
1572 | return NULL; | |
2b188cc1 JA |
1573 | } |
1574 | ||
8f6ed49a PB |
1575 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1576 | { | |
1577 | struct io_rings *r = ctx->rings; | |
1578 | ||
1579 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1580 | ctx->cq_extra--; | |
1581 | } | |
1582 | ||
9cf7c104 | 1583 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1584 | { |
2bc9930e JA |
1585 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1586 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1587 | |
8f6ed49a | 1588 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1589 | } |
de0617e4 | 1590 | |
9d858b21 | 1591 | return false; |
de0617e4 JA |
1592 | } |
1593 | ||
35645ac3 PB |
1594 | #define FFS_NOWAIT 0x1UL |
1595 | #define FFS_ISREG 0x2UL | |
1596 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG) | |
c97d8a0f PB |
1597 | |
1598 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1599 | { | |
35645ac3 | 1600 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1601 | } |
1602 | ||
fd08e530 PB |
1603 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1604 | { | |
906c6caa PB |
1605 | if (WARN_ON_ONCE(!req->link)) |
1606 | return NULL; | |
1607 | ||
4d13d1a4 PB |
1608 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1609 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1610 | |
1611 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1612 | io_req_set_refcount(req); |
4d13d1a4 PB |
1613 | __io_req_set_refcount(req->link, 2); |
1614 | return req->link; | |
fd08e530 PB |
1615 | } |
1616 | ||
1617 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1618 | { | |
4d13d1a4 | 1619 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1620 | return NULL; |
1621 | return __io_prep_linked_timeout(req); | |
1622 | } | |
1623 | ||
1e6fa521 JA |
1624 | static void io_prep_async_work(struct io_kiocb *req) |
1625 | { | |
1626 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1627 | struct io_ring_ctx *ctx = req->ctx; |
1628 | ||
b8e64b53 PB |
1629 | if (!(req->flags & REQ_F_CREDS)) { |
1630 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1631 | req->creds = get_current_cred(); |
b8e64b53 | 1632 | } |
003e8dcc | 1633 | |
e1d675df PB |
1634 | req->work.list.next = NULL; |
1635 | req->work.flags = 0; | |
feaadc4f PB |
1636 | if (req->flags & REQ_F_FORCE_ASYNC) |
1637 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1638 | ||
1e6fa521 JA |
1639 | if (req->flags & REQ_F_ISREG) { |
1640 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1641 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1642 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1643 | if (def->unbound_nonreg_file) |
1644 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1645 | } | |
561fb04a | 1646 | } |
cccf0ee8 | 1647 | |
cbdcb435 | 1648 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1649 | { |
cbdcb435 | 1650 | struct io_kiocb *cur; |
54a91f3b | 1651 | |
44eff40a PB |
1652 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1653 | struct io_ring_ctx *ctx = req->ctx; | |
1654 | ||
674ee8e1 | 1655 | spin_lock_irq(&ctx->timeout_lock); |
44eff40a PB |
1656 | io_for_each_link(cur, req) |
1657 | io_prep_async_work(cur); | |
674ee8e1 | 1658 | spin_unlock_irq(&ctx->timeout_lock); |
44eff40a PB |
1659 | } else { |
1660 | io_for_each_link(cur, req) | |
1661 | io_prep_async_work(cur); | |
1662 | } | |
561fb04a JA |
1663 | } |
1664 | ||
fff4e40e PB |
1665 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1666 | { | |
3d4aeb9f | 1667 | struct io_ring_ctx *ctx = req->ctx; |
33ce2aff | 1668 | struct io_submit_state *state = &ctx->submit_state; |
fff4e40e | 1669 | |
3d4aeb9f PB |
1670 | if (!(req->flags & REQ_F_CQE_SKIP)) |
1671 | ctx->submit_state.flush_cqes = true; | |
fff4e40e PB |
1672 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); |
1673 | } | |
1674 | ||
00169246 | 1675 | static void io_queue_async_work(struct io_kiocb *req, bool *dont_use) |
561fb04a | 1676 | { |
a197f664 | 1677 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1678 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1679 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1680 | |
3bfe6106 JA |
1681 | BUG_ON(!tctx); |
1682 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1683 | |
cbdcb435 PB |
1684 | /* init ->work of the whole link before punting */ |
1685 | io_prep_async_link(req); | |
991468dc JA |
1686 | |
1687 | /* | |
1688 | * Not expected to happen, but if we do have a bug where this _can_ | |
1689 | * happen, catch it here and ensure the request is marked as | |
1690 | * canceled. That will make io-wq go through the usual work cancel | |
1691 | * procedure rather than attempt to run this request (or create a new | |
1692 | * worker for it). | |
1693 | */ | |
1694 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1695 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1696 | ||
502c87d6 SR |
1697 | trace_io_uring_queue_async_work(ctx, req, req->user_data, req->opcode, req->flags, |
1698 | &req->work, io_wq_is_hashed(&req->work)); | |
ebf93667 | 1699 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1700 | if (link) |
1701 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1702 | } |
1703 | ||
1ee4160c | 1704 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1705 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1706 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1707 | { |
e8c2bc1f | 1708 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1709 | |
fd9c7bc5 | 1710 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1711 | if (status) |
1712 | req_set_fail(req); | |
01cec8c1 PB |
1713 | atomic_set(&req->ctx->cq_timeouts, |
1714 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1715 | list_del_init(&req->timeout.list); |
913a571a | 1716 | io_fill_cqe_req(req, status, 0); |
91c2f697 | 1717 | io_put_req_deferred(req); |
5262f567 JA |
1718 | } |
1719 | } | |
1720 | ||
c072481d | 1721 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1722 | { |
441b8a78 | 1723 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1724 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1725 | struct io_defer_entry, list); | |
de0617e4 | 1726 | |
9cf7c104 | 1727 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1728 | break; |
27dc8338 | 1729 | list_del_init(&de->list); |
907d1df3 | 1730 | io_req_task_queue(de->req); |
27dc8338 | 1731 | kfree(de); |
441b8a78 | 1732 | } |
04518945 PB |
1733 | } |
1734 | ||
c072481d | 1735 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1736 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1737 | { |
441b8a78 | 1738 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1739 | |
79ebeaee | 1740 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1741 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1742 | u32 events_needed, events_got; |
360428f8 | 1743 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1744 | struct io_kiocb, timeout.list); |
de0617e4 | 1745 | |
8eb7e2d0 | 1746 | if (io_is_timeout_noseq(req)) |
360428f8 | 1747 | break; |
f010505b MDG |
1748 | |
1749 | /* | |
1750 | * Since seq can easily wrap around over time, subtract | |
1751 | * the last seq at which timeouts were flushed before comparing. | |
1752 | * Assuming not more than 2^31-1 events have happened since, | |
1753 | * these subtractions won't have wrapped, so we can check if | |
1754 | * target is in [last_seq, current_seq] by comparing the two. | |
1755 | */ | |
1756 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1757 | events_got = seq - ctx->cq_last_tm_flush; | |
1758 | if (events_got < events_needed) | |
360428f8 | 1759 | break; |
bfe68a22 | 1760 | |
135fcde8 | 1761 | list_del_init(&req->timeout.list); |
1ee4160c | 1762 | io_kill_timeout(req, 0); |
f18ee4cf | 1763 | } |
f010505b | 1764 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1765 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1766 | } |
5262f567 | 1767 | |
9333f6b4 PB |
1768 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) |
1769 | { | |
1770 | /* order cqe stores with ring update */ | |
1771 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
1772 | } | |
1773 | ||
9aa8dfde | 1774 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1775 | { |
9aa8dfde PB |
1776 | if (ctx->off_timeout_used || ctx->drain_active) { |
1777 | spin_lock(&ctx->completion_lock); | |
1778 | if (ctx->off_timeout_used) | |
1779 | io_flush_timeouts(ctx); | |
1780 | if (ctx->drain_active) | |
1781 | io_queue_deferred(ctx); | |
1782 | io_commit_cqring(ctx); | |
1783 | spin_unlock(&ctx->completion_lock); | |
1784 | } | |
1785 | if (ctx->has_evfd) | |
1786 | io_eventfd_signal(ctx); | |
de0617e4 JA |
1787 | } |
1788 | ||
90554200 JA |
1789 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1790 | { | |
1791 | struct io_rings *r = ctx->rings; | |
1792 | ||
a566c556 | 1793 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1794 | } |
1795 | ||
888aae2e PB |
1796 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1797 | { | |
1798 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1799 | } | |
1800 | ||
d068b506 | 1801 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1802 | { |
75b28aff | 1803 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1804 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1805 | |
115e12e5 SB |
1806 | /* |
1807 | * writes to the cq entry need to come after reading head; the | |
1808 | * control dependency is enough as we're using WRITE_ONCE to | |
1809 | * fill the cq entry | |
1810 | */ | |
a566c556 | 1811 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1812 | return NULL; |
1813 | ||
888aae2e | 1814 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1815 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1816 | } |
1817 | ||
77bc59b4 | 1818 | static void io_eventfd_signal(struct io_ring_ctx *ctx) |
f2842ab5 | 1819 | { |
77bc59b4 UA |
1820 | struct io_ev_fd *ev_fd; |
1821 | ||
77bc59b4 UA |
1822 | rcu_read_lock(); |
1823 | /* | |
1824 | * rcu_dereference ctx->io_ev_fd once and use it for both for checking | |
1825 | * and eventfd_signal | |
1826 | */ | |
1827 | ev_fd = rcu_dereference(ctx->io_ev_fd); | |
1828 | ||
1829 | /* | |
1830 | * Check again if ev_fd exists incase an io_eventfd_unregister call | |
1831 | * completed between the NULL check of ctx->io_ev_fd at the start of | |
1832 | * the function and rcu_read_lock. | |
1833 | */ | |
1834 | if (unlikely(!ev_fd)) | |
1835 | goto out; | |
7e55a19c | 1836 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
77bc59b4 UA |
1837 | goto out; |
1838 | ||
c75312dd | 1839 | if (!ev_fd->eventfd_async || io_wq_current_is_worker()) |
77bc59b4 | 1840 | eventfd_signal(ev_fd->cq_ev_fd, 1); |
77bc59b4 UA |
1841 | out: |
1842 | rcu_read_unlock(); | |
f2842ab5 JA |
1843 | } |
1844 | ||
9aa8dfde PB |
1845 | static inline void io_cqring_wake(struct io_ring_ctx *ctx) |
1846 | { | |
1847 | /* | |
1848 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1849 | * io_should_wake() handle the termination of the loop and only | |
1850 | * wake as many waiters as we need to. | |
1851 | */ | |
1852 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1853 | wake_up_all(&ctx->cq_wait); | |
1854 | } | |
1855 | ||
2c5d763c JA |
1856 | /* |
1857 | * This should only get called when at least one event has been posted. | |
1858 | * Some applications rely on the eventfd notification count only changing | |
1859 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1860 | * 1:1 relationship between how many times this function is called (and | |
1861 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1862 | */ | |
66fc25ca | 1863 | static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1864 | { |
9aa8dfde PB |
1865 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
1866 | ctx->has_evfd)) | |
9333f6b4 PB |
1867 | __io_commit_cqring_flush(ctx); |
1868 | ||
9aa8dfde | 1869 | io_cqring_wake(ctx); |
1d7bb1d5 JA |
1870 | } |
1871 | ||
80c18e4a PB |
1872 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1873 | { | |
9aa8dfde PB |
1874 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
1875 | ctx->has_evfd)) | |
9333f6b4 PB |
1876 | __io_commit_cqring_flush(ctx); |
1877 | ||
9aa8dfde PB |
1878 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1879 | io_cqring_wake(ctx); | |
80c18e4a PB |
1880 | } |
1881 | ||
c4a2ed72 | 1882 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1883 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1884 | { |
b18032bb | 1885 | bool all_flushed, posted; |
1d7bb1d5 | 1886 | |
a566c556 | 1887 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1888 | return false; |
1d7bb1d5 | 1889 | |
b18032bb | 1890 | posted = false; |
79ebeaee | 1891 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1892 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1893 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1894 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1895 | |
1d7bb1d5 JA |
1896 | if (!cqe && !force) |
1897 | break; | |
6c2450ae PB |
1898 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1899 | struct io_overflow_cqe, list); | |
1900 | if (cqe) | |
1901 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1902 | else | |
8f6ed49a PB |
1903 | io_account_cq_overflow(ctx); |
1904 | ||
b18032bb | 1905 | posted = true; |
6c2450ae PB |
1906 | list_del(&ocqe->list); |
1907 | kfree(ocqe); | |
1d7bb1d5 JA |
1908 | } |
1909 | ||
09e88404 PB |
1910 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1911 | if (all_flushed) { | |
5ed7a37d | 1912 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1913 | WRITE_ONCE(ctx->rings->sq_flags, |
1914 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1915 | } |
46930143 | 1916 | |
b18032bb JA |
1917 | if (posted) |
1918 | io_commit_cqring(ctx); | |
79ebeaee | 1919 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1920 | if (posted) |
1921 | io_cqring_ev_posted(ctx); | |
09e88404 | 1922 | return all_flushed; |
1d7bb1d5 JA |
1923 | } |
1924 | ||
90f67366 | 1925 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1926 | { |
ca0a2651 JA |
1927 | bool ret = true; |
1928 | ||
5ed7a37d | 1929 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1930 | /* iopoll syncs against uring_lock, not completion_lock */ |
1931 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1932 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1933 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1934 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1935 | mutex_unlock(&ctx->uring_lock); | |
1936 | } | |
ca0a2651 JA |
1937 | |
1938 | return ret; | |
6c503150 PB |
1939 | } |
1940 | ||
6a290a14 PB |
1941 | /* must to be called somewhat shortly after putting a request */ |
1942 | static inline void io_put_task(struct task_struct *task, int nr) | |
1943 | { | |
1944 | struct io_uring_task *tctx = task->io_uring; | |
1945 | ||
e98e49b2 PB |
1946 | if (likely(task == current)) { |
1947 | tctx->cached_refs += nr; | |
1948 | } else { | |
1949 | percpu_counter_sub(&tctx->inflight, nr); | |
1950 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1951 | wake_up(&tctx->wait); | |
1952 | put_task_struct_many(task, nr); | |
1953 | } | |
6a290a14 PB |
1954 | } |
1955 | ||
9a10867a PB |
1956 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1957 | { | |
1958 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1959 | ||
1960 | percpu_counter_add(&tctx->inflight, refill); | |
1961 | refcount_add(refill, ¤t->usage); | |
1962 | tctx->cached_refs += refill; | |
1963 | } | |
1964 | ||
1965 | static inline void io_get_task_refs(int nr) | |
1966 | { | |
1967 | struct io_uring_task *tctx = current->io_uring; | |
1968 | ||
1969 | tctx->cached_refs -= nr; | |
1970 | if (unlikely(tctx->cached_refs < 0)) | |
1971 | io_task_refs_refill(tctx); | |
1972 | } | |
1973 | ||
3cc7fdb9 PB |
1974 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
1975 | { | |
1976 | struct io_uring_task *tctx = task->io_uring; | |
1977 | unsigned int refs = tctx->cached_refs; | |
1978 | ||
1979 | if (refs) { | |
1980 | tctx->cached_refs = 0; | |
1981 | percpu_counter_sub(&tctx->inflight, refs); | |
1982 | put_task_struct_many(task, refs); | |
1983 | } | |
1984 | } | |
1985 | ||
d4d19c19 | 1986 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 1987 | s32 res, u32 cflags) |
2b188cc1 | 1988 | { |
cce4b8b0 | 1989 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1990 | |
cce4b8b0 PB |
1991 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1992 | if (!ocqe) { | |
1993 | /* | |
1994 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1995 | * or cannot allocate an overflow entry, then we need to drop it | |
1996 | * on the floor. | |
1997 | */ | |
8f6ed49a | 1998 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1999 | return false; |
2b188cc1 | 2000 | } |
cce4b8b0 | 2001 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 2002 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
2003 | WRITE_ONCE(ctx->rings->sq_flags, |
2004 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
2005 | ||
cce4b8b0 | 2006 | } |
d4d19c19 | 2007 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
2008 | ocqe->cqe.res = res; |
2009 | ocqe->cqe.flags = cflags; | |
2010 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
2011 | return true; | |
2b188cc1 JA |
2012 | } |
2013 | ||
ae4da189 | 2014 | static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, |
913a571a | 2015 | s32 res, u32 cflags) |
2b188cc1 JA |
2016 | { |
2017 | struct io_uring_cqe *cqe; | |
2018 | ||
2019 | /* | |
2020 | * If we can't get a cq entry, userspace overflowed the | |
2021 | * submission (by quite a lot). Increment the overflow count in | |
2022 | * the ring. | |
2023 | */ | |
d068b506 | 2024 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 2025 | if (likely(cqe)) { |
d4d19c19 | 2026 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 2027 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 2028 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 2029 | return true; |
2b188cc1 | 2030 | } |
d4d19c19 | 2031 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
2032 | } |
2033 | ||
ae4da189 | 2034 | static inline bool __io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
d5ec1dfa | 2035 | { |
502c87d6 | 2036 | trace_io_uring_complete(req->ctx, req, req->user_data, res, cflags); |
ae4da189 | 2037 | return __io_fill_cqe(req->ctx, req->user_data, res, cflags); |
d5ec1dfa SR |
2038 | } |
2039 | ||
913a571a | 2040 | static noinline void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
bcda7baa | 2041 | { |
04c76b41 | 2042 | if (!(req->flags & REQ_F_CQE_SKIP)) |
ae4da189 | 2043 | __io_fill_cqe_req(req, res, cflags); |
bcda7baa JA |
2044 | } |
2045 | ||
913a571a PB |
2046 | static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, |
2047 | s32 res, u32 cflags) | |
bcda7baa | 2048 | { |
913a571a | 2049 | ctx->cq_extra++; |
502c87d6 | 2050 | trace_io_uring_complete(ctx, NULL, user_data, res, cflags); |
ae4da189 | 2051 | return __io_fill_cqe(ctx, user_data, res, cflags); |
bcda7baa JA |
2052 | } |
2053 | ||
a37fae8a HX |
2054 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, |
2055 | u32 cflags) | |
2b188cc1 | 2056 | { |
78e19bbe | 2057 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 2058 | |
04c76b41 | 2059 | if (!(req->flags & REQ_F_CQE_SKIP)) |
ae4da189 | 2060 | __io_fill_cqe_req(req, res, cflags); |
c7dae4ba JA |
2061 | /* |
2062 | * If we're the last reference to this request, add to our locked | |
2063 | * free_list cache. | |
2064 | */ | |
de9b4cca | 2065 | if (req_ref_put_and_test(req)) { |
7a612350 | 2066 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 2067 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
2068 | io_disarm_next(req); |
2069 | if (req->link) { | |
2070 | io_req_task_queue(req->link); | |
2071 | req->link = NULL; | |
2072 | } | |
2073 | } | |
ab409402 | 2074 | io_req_put_rsrc(req, ctx); |
8197b053 PB |
2075 | /* |
2076 | * Selected buffer deallocation in io_clean_op() assumes that | |
2077 | * we don't hold ->completion_lock. Clean them here to avoid | |
2078 | * deadlocks. | |
2079 | */ | |
2080 | io_put_kbuf_comp(req); | |
c7dae4ba JA |
2081 | io_dismantle_req(req); |
2082 | io_put_task(req->task, 1); | |
c2b6c6bc | 2083 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 2084 | ctx->locked_free_nr++; |
180f829f | 2085 | } |
a37fae8a HX |
2086 | } |
2087 | ||
2088 | static void io_req_complete_post(struct io_kiocb *req, s32 res, | |
2089 | u32 cflags) | |
2090 | { | |
2091 | struct io_ring_ctx *ctx = req->ctx; | |
2092 | ||
2093 | spin_lock(&ctx->completion_lock); | |
2094 | __io_req_complete_post(req, res, cflags); | |
7a612350 | 2095 | io_commit_cqring(ctx); |
79ebeaee | 2096 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 2097 | io_cqring_ev_posted(ctx); |
4e3d9ff9 JA |
2098 | } |
2099 | ||
54daa9b2 PB |
2100 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
2101 | u32 cflags) | |
229a7b63 | 2102 | { |
a38d68db | 2103 | req->result = res; |
d17e56eb | 2104 | req->cflags = cflags; |
e342c807 | 2105 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
2106 | } |
2107 | ||
889fca73 | 2108 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 2109 | s32 res, u32 cflags) |
bcda7baa | 2110 | { |
889fca73 PB |
2111 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
2112 | io_req_complete_state(req, res, cflags); | |
a38d68db | 2113 | else |
c7dae4ba | 2114 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
2115 | } |
2116 | ||
54daa9b2 | 2117 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 2118 | { |
889fca73 | 2119 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
2120 | } |
2121 | ||
54daa9b2 | 2122 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 2123 | { |
93d2bcd2 | 2124 | req_set_fail(req); |
ab0ac095 | 2125 | io_req_complete_post(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED)); |
f41db273 PB |
2126 | } |
2127 | ||
c6d3d9cb PB |
2128 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
2129 | { | |
2130 | /* | |
2131 | * We don't submit, fail them all, for that replace hardlinks with | |
2132 | * normal links. Extra REQ_F_LINK is tolerated. | |
2133 | */ | |
2134 | req->flags &= ~REQ_F_HARDLINK; | |
2135 | req->flags |= REQ_F_LINK; | |
2136 | io_req_complete_failed(req, req->result); | |
2137 | } | |
2138 | ||
864ea921 PB |
2139 | /* |
2140 | * Don't initialise the fields below on every allocation, but do that in | |
2141 | * advance and keep them valid across allocations. | |
2142 | */ | |
2143 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
2144 | { | |
2145 | req->ctx = ctx; | |
2146 | req->link = NULL; | |
2147 | req->async_data = NULL; | |
2148 | /* not necessary, but safer to zero */ | |
2149 | req->result = 0; | |
2150 | } | |
2151 | ||
dac7a098 | 2152 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 2153 | struct io_submit_state *state) |
dac7a098 | 2154 | { |
79ebeaee | 2155 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2156 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 2157 | ctx->locked_free_nr = 0; |
79ebeaee | 2158 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
2159 | } |
2160 | ||
dd78f492 | 2161 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 2162 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 2163 | { |
c7dae4ba | 2164 | struct io_submit_state *state = &ctx->submit_state; |
0ddf92e8 | 2165 | |
c7dae4ba JA |
2166 | /* |
2167 | * If we have more than a batch's worth of requests in our IRQ side | |
2168 | * locked cache, grab the lock and move them over to our submission | |
2169 | * side cache. | |
2170 | */ | |
d0acdee2 | 2171 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 2172 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc | 2173 | return !!state->free_list.next; |
0ddf92e8 JA |
2174 | } |
2175 | ||
5d5901a3 PB |
2176 | /* |
2177 | * A request might get retired back into the request caches even before opcode | |
2178 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
2179 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
2180 | * and with extra caution to not get a request that is still worked on. | |
2181 | */ | |
c072481d | 2182 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 2183 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 2184 | { |
e5d1bc0a | 2185 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 | 2186 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 PB |
2187 | void *reqs[IO_REQ_ALLOC_BATCH]; |
2188 | struct io_kiocb *req; | |
864ea921 | 2189 | int ret, i; |
e5d1bc0a | 2190 | |
c2b6c6bc | 2191 | if (likely(state->free_list.next || io_flush_cached_reqs(ctx))) |
a33ae9ce | 2192 | return true; |
e5d1bc0a | 2193 | |
3ab665b7 | 2194 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 2195 | |
864ea921 PB |
2196 | /* |
2197 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2198 | * retry single alloc to be on the safe side. | |
2199 | */ | |
2200 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
2201 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
2202 | if (!reqs[0]) | |
a33ae9ce | 2203 | return false; |
864ea921 | 2204 | ret = 1; |
2b188cc1 | 2205 | } |
864ea921 | 2206 | |
37f0e767 | 2207 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 PB |
2208 | for (i = 0; i < ret; i++) { |
2209 | req = reqs[i]; | |
2210 | ||
2211 | io_preinit_req(req, ctx); | |
c2b6c6bc | 2212 | wq_stack_add_head(&req->comp_list, &state->free_list); |
3ab665b7 | 2213 | } |
a33ae9ce PB |
2214 | return true; |
2215 | } | |
2216 | ||
2217 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
2218 | { | |
2219 | if (unlikely(!ctx->submit_state.free_list.next)) | |
2220 | return __io_alloc_req_refill(ctx); | |
2221 | return true; | |
2222 | } | |
2223 | ||
2224 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2225 | { | |
2226 | struct io_wq_work_node *node; | |
2227 | ||
2228 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 2229 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
2230 | } |
2231 | ||
e1d767f0 | 2232 | static inline void io_put_file(struct file *file) |
8da11c19 | 2233 | { |
e1d767f0 | 2234 | if (file) |
8da11c19 PB |
2235 | fput(file); |
2236 | } | |
2237 | ||
6b639522 | 2238 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2239 | { |
094bae49 | 2240 | unsigned int flags = req->flags; |
929a3af9 | 2241 | |
867f8fa5 | 2242 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 2243 | io_clean_op(req); |
e1d767f0 PB |
2244 | if (!(flags & REQ_F_FIXED_FILE)) |
2245 | io_put_file(req->file); | |
e65ef56d JA |
2246 | } |
2247 | ||
c072481d | 2248 | static __cold void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2249 | { |
51a4cc11 | 2250 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2251 | |
ab409402 | 2252 | io_req_put_rsrc(req, ctx); |
216578e5 | 2253 | io_dismantle_req(req); |
7c660731 | 2254 | io_put_task(req->task, 1); |
c6ca97b3 | 2255 | |
79ebeaee | 2256 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2257 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2258 | ctx->locked_free_nr++; |
79ebeaee | 2259 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2260 | } |
2261 | ||
f2f87370 PB |
2262 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2263 | { | |
2264 | struct io_kiocb *nxt = req->link; | |
2265 | ||
2266 | req->link = nxt->link; | |
2267 | nxt->link = NULL; | |
2268 | } | |
2269 | ||
33cc89a9 PB |
2270 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2271 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2272 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2273 | { |
33cc89a9 | 2274 | struct io_kiocb *link = req->link; |
f2f87370 | 2275 | |
b97e736a | 2276 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2277 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2278 | |
f2f87370 | 2279 | io_remove_next_linked(req); |
90cd7e42 | 2280 | link->timeout.head = NULL; |
fd9c7bc5 | 2281 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2282 | list_del(&link->timeout.list); |
04c76b41 | 2283 | /* leave REQ_F_CQE_SKIP to io_fill_cqe_req */ |
913a571a | 2284 | io_fill_cqe_req(link, -ECANCELED, 0); |
91c2f697 | 2285 | io_put_req_deferred(link); |
d4729fbd | 2286 | return true; |
c9abd7ad PB |
2287 | } |
2288 | } | |
d4729fbd | 2289 | return false; |
7c86ffee PB |
2290 | } |
2291 | ||
d148ca4b | 2292 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2293 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2294 | { |
33cc89a9 | 2295 | struct io_kiocb *nxt, *link = req->link; |
04c76b41 | 2296 | bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; |
9e645e11 | 2297 | |
f2f87370 | 2298 | req->link = NULL; |
f2f87370 | 2299 | while (link) { |
a8295b98 HX |
2300 | long res = -ECANCELED; |
2301 | ||
2302 | if (link->flags & REQ_F_FAIL) | |
2303 | res = link->result; | |
2304 | ||
f2f87370 PB |
2305 | nxt = link->link; |
2306 | link->link = NULL; | |
2665abfd | 2307 | |
502c87d6 SR |
2308 | trace_io_uring_fail_link(req->ctx, req, req->user_data, |
2309 | req->opcode, link); | |
2310 | ||
04c76b41 PB |
2311 | if (!ignore_cqes) { |
2312 | link->flags &= ~REQ_F_CQE_SKIP; | |
2313 | io_fill_cqe_req(link, res, 0); | |
2314 | } | |
91c2f697 | 2315 | io_put_req_deferred(link); |
f2f87370 | 2316 | link = nxt; |
9e645e11 | 2317 | } |
33cc89a9 | 2318 | } |
9e645e11 | 2319 | |
33cc89a9 PB |
2320 | static bool io_disarm_next(struct io_kiocb *req) |
2321 | __must_hold(&req->ctx->completion_lock) | |
2322 | { | |
2323 | bool posted = false; | |
2324 | ||
0756a869 PB |
2325 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2326 | struct io_kiocb *link = req->link; | |
2327 | ||
906c6caa | 2328 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2329 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2330 | io_remove_next_linked(req); | |
04c76b41 | 2331 | /* leave REQ_F_CQE_SKIP to io_fill_cqe_req */ |
913a571a | 2332 | io_fill_cqe_req(link, -ECANCELED, 0); |
0756a869 PB |
2333 | io_put_req_deferred(link); |
2334 | posted = true; | |
2335 | } | |
2336 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2337 | struct io_ring_ctx *ctx = req->ctx; |
2338 | ||
2339 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2340 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2341 | spin_unlock_irq(&ctx->timeout_lock); |
2342 | } | |
93d2bcd2 | 2343 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2344 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2345 | posted |= (req->link != NULL); |
2346 | io_fail_links(req); | |
2347 | } | |
2348 | return posted; | |
9e645e11 JA |
2349 | } |
2350 | ||
d81499bf PB |
2351 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2352 | { | |
2353 | struct io_ring_ctx *ctx = req->ctx; | |
2354 | bool posted; | |
2355 | ||
2356 | spin_lock(&ctx->completion_lock); | |
2357 | posted = io_disarm_next(req); | |
2358 | if (posted) | |
33ce2aff | 2359 | io_commit_cqring(ctx); |
d81499bf PB |
2360 | spin_unlock(&ctx->completion_lock); |
2361 | if (posted) | |
2362 | io_cqring_ev_posted(ctx); | |
2363 | } | |
2364 | ||
2365 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2366 | { |
33cc89a9 | 2367 | struct io_kiocb *nxt; |
944e58bf | 2368 | |
d81499bf PB |
2369 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
2370 | return NULL; | |
9e645e11 JA |
2371 | /* |
2372 | * If LINK is set, we have dependent requests in this chain. If we | |
2373 | * didn't fail this request, queue the first one up, moving any other | |
2374 | * dependencies to the next request. In case of failure, fail the rest | |
2375 | * of the chain. | |
2376 | */ | |
d81499bf PB |
2377 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2378 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2379 | nxt = req->link; |
2380 | req->link = NULL; | |
2381 | return nxt; | |
4d7dd462 | 2382 | } |
9e645e11 | 2383 | |
f237c30a | 2384 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2385 | { |
2386 | if (!ctx) | |
2387 | return; | |
f237c30a | 2388 | if (*locked) { |
c450178d | 2389 | io_submit_flush_completions(ctx); |
2c32395d | 2390 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2391 | *locked = false; |
2c32395d PB |
2392 | } |
2393 | percpu_ref_put(&ctx->refs); | |
2394 | } | |
2395 | ||
f28c240e HX |
2396 | static inline void ctx_commit_and_unlock(struct io_ring_ctx *ctx) |
2397 | { | |
2398 | io_commit_cqring(ctx); | |
2399 | spin_unlock(&ctx->completion_lock); | |
2400 | io_cqring_ev_posted(ctx); | |
2401 | } | |
2402 | ||
2403 | static void handle_prev_tw_list(struct io_wq_work_node *node, | |
2404 | struct io_ring_ctx **ctx, bool *uring_locked) | |
2405 | { | |
2406 | if (*ctx && !*uring_locked) | |
2407 | spin_lock(&(*ctx)->completion_lock); | |
2408 | ||
2409 | do { | |
2410 | struct io_wq_work_node *next = node->next; | |
2411 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2412 | io_task_work.node); | |
2413 | ||
34d2bfe7 JA |
2414 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2415 | ||
f28c240e HX |
2416 | if (req->ctx != *ctx) { |
2417 | if (unlikely(!*uring_locked && *ctx)) | |
2418 | ctx_commit_and_unlock(*ctx); | |
2419 | ||
2420 | ctx_flush_and_put(*ctx, uring_locked); | |
2421 | *ctx = req->ctx; | |
2422 | /* if not contended, grab and improve batching */ | |
2423 | *uring_locked = mutex_trylock(&(*ctx)->uring_lock); | |
2424 | percpu_ref_get(&(*ctx)->refs); | |
2425 | if (unlikely(!*uring_locked)) | |
2426 | spin_lock(&(*ctx)->completion_lock); | |
2427 | } | |
2428 | if (likely(*uring_locked)) | |
2429 | req->io_task_work.func(req, uring_locked); | |
2430 | else | |
cc3cec83 JA |
2431 | __io_req_complete_post(req, req->result, |
2432 | io_put_kbuf_comp(req)); | |
f28c240e HX |
2433 | node = next; |
2434 | } while (node); | |
2435 | ||
2436 | if (unlikely(!*uring_locked)) | |
2437 | ctx_commit_and_unlock(*ctx); | |
2438 | } | |
2439 | ||
2440 | static void handle_tw_list(struct io_wq_work_node *node, | |
2441 | struct io_ring_ctx **ctx, bool *locked) | |
9f8d032a HX |
2442 | { |
2443 | do { | |
2444 | struct io_wq_work_node *next = node->next; | |
2445 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2446 | io_task_work.node); | |
2447 | ||
34d2bfe7 JA |
2448 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2449 | ||
9f8d032a HX |
2450 | if (req->ctx != *ctx) { |
2451 | ctx_flush_and_put(*ctx, locked); | |
2452 | *ctx = req->ctx; | |
2453 | /* if not contended, grab and improve batching */ | |
2454 | *locked = mutex_trylock(&(*ctx)->uring_lock); | |
2455 | percpu_ref_get(&(*ctx)->refs); | |
2456 | } | |
2457 | req->io_task_work.func(req, locked); | |
2458 | node = next; | |
2459 | } while (node); | |
2460 | } | |
2461 | ||
7cbf1722 | 2462 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2463 | { |
f28c240e | 2464 | bool uring_locked = false; |
ebd0df2e | 2465 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2466 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2467 | task_work); | |
c40f6379 | 2468 | |
16f72070 | 2469 | while (1) { |
f28c240e | 2470 | struct io_wq_work_node *node1, *node2; |
3f18407d | 2471 | |
f28c240e HX |
2472 | if (!tctx->task_list.first && |
2473 | !tctx->prior_task_list.first && uring_locked) | |
8d4ad41e PB |
2474 | io_submit_flush_completions(ctx); |
2475 | ||
3f18407d | 2476 | spin_lock_irq(&tctx->task_lock); |
f28c240e HX |
2477 | node1 = tctx->prior_task_list.first; |
2478 | node2 = tctx->task_list.first; | |
3f18407d | 2479 | INIT_WQ_LIST(&tctx->task_list); |
f28c240e HX |
2480 | INIT_WQ_LIST(&tctx->prior_task_list); |
2481 | if (!node2 && !node1) | |
6294f368 | 2482 | tctx->task_running = false; |
3f18407d | 2483 | spin_unlock_irq(&tctx->task_lock); |
f28c240e | 2484 | if (!node2 && !node1) |
6294f368 | 2485 | break; |
3f18407d | 2486 | |
f28c240e HX |
2487 | if (node1) |
2488 | handle_prev_tw_list(node1, &ctx, &uring_locked); | |
6294f368 | 2489 | |
f28c240e HX |
2490 | if (node2) |
2491 | handle_tw_list(node2, &ctx, &uring_locked); | |
7cbf1722 | 2492 | cond_resched(); |
3f18407d | 2493 | } |
ebd0df2e | 2494 | |
f28c240e | 2495 | ctx_flush_and_put(ctx, &uring_locked); |
3cc7fdb9 PB |
2496 | |
2497 | /* relaxed read is enough as only the task itself sets ->in_idle */ | |
2498 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2499 | io_uring_drop_tctx_refs(current); | |
7cbf1722 JA |
2500 | } |
2501 | ||
4813c377 | 2502 | static void io_req_task_work_add(struct io_kiocb *req, bool priority) |
7cbf1722 | 2503 | { |
c15b79de | 2504 | struct task_struct *tsk = req->task; |
7cbf1722 | 2505 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2506 | enum task_work_notify_mode notify; |
e09ee510 | 2507 | struct io_wq_work_node *node; |
0b81e80c | 2508 | unsigned long flags; |
6294f368 | 2509 | bool running; |
7cbf1722 JA |
2510 | |
2511 | WARN_ON_ONCE(!tctx); | |
2512 | ||
d5361233 JA |
2513 | io_drop_inflight_file(req); |
2514 | ||
0b81e80c | 2515 | spin_lock_irqsave(&tctx->task_lock, flags); |
4813c377 HX |
2516 | if (priority) |
2517 | wq_list_add_tail(&req->io_task_work.node, &tctx->prior_task_list); | |
2518 | else | |
2519 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); | |
6294f368 PB |
2520 | running = tctx->task_running; |
2521 | if (!running) | |
2522 | tctx->task_running = true; | |
0b81e80c | 2523 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2524 | |
2525 | /* task_work already pending, we're done */ | |
6294f368 | 2526 | if (running) |
e09ee510 | 2527 | return; |
7cbf1722 | 2528 | |
c15b79de PB |
2529 | /* |
2530 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2531 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2532 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2533 | * will do the job. | |
2534 | */ | |
2535 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
d97ec623 PB |
2536 | if (likely(!task_work_add(tsk, &tctx->task_work, notify))) { |
2537 | if (notify == TWA_NONE) | |
2538 | wake_up_process(tsk); | |
e09ee510 | 2539 | return; |
c15b79de | 2540 | } |
2215bed9 | 2541 | |
0b81e80c | 2542 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2543 | tctx->task_running = false; |
4813c377 | 2544 | node = wq_list_merge(&tctx->prior_task_list, &tctx->task_list); |
0b81e80c | 2545 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2546 | |
e09ee510 PB |
2547 | while (node) { |
2548 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2549 | node = node->next; | |
2550 | if (llist_add(&req->io_task_work.fallback_node, | |
2551 | &req->ctx->fallback_llist)) | |
2552 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2553 | } | |
eab30c4d PB |
2554 | } |
2555 | ||
f237c30a | 2556 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2557 | { |
87ceb6a6 | 2558 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2559 | |
b18a1a45 | 2560 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2561 | io_tw_lock(ctx, locked); |
2593553a | 2562 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2563 | } |
2564 | ||
f237c30a | 2565 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2566 | { |
2567 | struct io_ring_ctx *ctx = req->ctx; | |
2568 | ||
f237c30a | 2569 | io_tw_lock(ctx, locked); |
316319e8 | 2570 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2571 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2572 | __io_queue_sqe(req); |
81b6d05c | 2573 | else |
2593553a | 2574 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2575 | } |
2576 | ||
2c4b8eb6 | 2577 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2578 | { |
2c4b8eb6 | 2579 | req->result = ret; |
5b0a6acc | 2580 | req->io_task_work.func = io_req_task_cancel; |
4813c377 | 2581 | io_req_task_work_add(req, false); |
c40f6379 JA |
2582 | } |
2583 | ||
2c4b8eb6 | 2584 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2585 | { |
5b0a6acc | 2586 | req->io_task_work.func = io_req_task_submit; |
4813c377 | 2587 | io_req_task_work_add(req, false); |
a3df7698 PB |
2588 | } |
2589 | ||
773af691 JA |
2590 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2591 | { | |
2592 | req->io_task_work.func = io_queue_async_work; | |
4813c377 | 2593 | io_req_task_work_add(req, false); |
773af691 JA |
2594 | } |
2595 | ||
f2f87370 | 2596 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2597 | { |
9b5f7bd9 | 2598 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2599 | |
2600 | if (nxt) | |
906a8c3f | 2601 | io_req_task_queue(nxt); |
c69f8dbe JL |
2602 | } |
2603 | ||
c3524383 | 2604 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2605 | { |
c3524383 PB |
2606 | io_queue_next(req); |
2607 | __io_free_req(req); | |
2608 | } | |
8766dd51 | 2609 | |
f237c30a PB |
2610 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2611 | { | |
2612 | io_free_req(req); | |
2613 | } | |
2614 | ||
3aa83bfb | 2615 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 2616 | struct io_wq_work_node *node) |
3aa83bfb | 2617 | __must_hold(&ctx->uring_lock) |
5af1d13e | 2618 | { |
d4b7a5ef | 2619 | struct task_struct *task = NULL; |
37f0e767 | 2620 | int task_refs = 0; |
5af1d13e | 2621 | |
3aa83bfb PB |
2622 | do { |
2623 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2624 | comp_list); | |
2d6500d4 | 2625 | |
def77acf | 2626 | if (unlikely(req->flags & REQ_F_REFCOUNT)) { |
c1e53a69 | 2627 | node = req->comp_list.next; |
def77acf PB |
2628 | if (!req_ref_put_and_test(req)) |
2629 | continue; | |
c1e53a69 | 2630 | } |
2d6500d4 | 2631 | |
ab409402 | 2632 | io_req_put_rsrc_locked(req, ctx); |
d4b7a5ef PB |
2633 | io_queue_next(req); |
2634 | io_dismantle_req(req); | |
5af1d13e | 2635 | |
d4b7a5ef PB |
2636 | if (req->task != task) { |
2637 | if (task) | |
2638 | io_put_task(task, task_refs); | |
2639 | task = req->task; | |
2640 | task_refs = 0; | |
2641 | } | |
2642 | task_refs++; | |
c1e53a69 | 2643 | node = req->comp_list.next; |
d4b7a5ef | 2644 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
3aa83bfb | 2645 | } while (node); |
d4b7a5ef | 2646 | |
d4b7a5ef PB |
2647 | if (task) |
2648 | io_put_task(task, task_refs); | |
7a743e22 PB |
2649 | } |
2650 | ||
c450178d | 2651 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2652 | __must_hold(&ctx->uring_lock) |
905c172f | 2653 | { |
6f33b0bc | 2654 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 2655 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 2656 | |
3d4aeb9f PB |
2657 | if (state->flush_cqes) { |
2658 | spin_lock(&ctx->completion_lock); | |
2659 | wq_list_for_each(node, prev, &state->compl_reqs) { | |
2660 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
6f33b0bc | 2661 | comp_list); |
5182ed2e | 2662 | |
3d4aeb9f | 2663 | if (!(req->flags & REQ_F_CQE_SKIP)) |
ae4da189 | 2664 | __io_fill_cqe_req(req, req->result, req->cflags); |
4d9237e3 JA |
2665 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
2666 | struct async_poll *apoll = req->apoll; | |
2667 | ||
2668 | if (apoll->double_poll) | |
2669 | kfree(apoll->double_poll); | |
2670 | list_add(&apoll->poll.wait.entry, | |
2671 | &ctx->apoll_cache); | |
2672 | req->flags &= ~REQ_F_POLLED; | |
2673 | } | |
3d4aeb9f PB |
2674 | } |
2675 | ||
2676 | io_commit_cqring(ctx); | |
2677 | spin_unlock(&ctx->completion_lock); | |
2678 | io_cqring_ev_posted(ctx); | |
2679 | state->flush_cqes = false; | |
905c172f | 2680 | } |
5182ed2e | 2681 | |
1cce17ac | 2682 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 2683 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
2684 | } |
2685 | ||
ba816ad6 JA |
2686 | /* |
2687 | * Drop reference to request, return next in chain (if there is one) if this | |
2688 | * was the last reference to this request. | |
2689 | */ | |
0d85035a | 2690 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2691 | { |
9b5f7bd9 PB |
2692 | struct io_kiocb *nxt = NULL; |
2693 | ||
de9b4cca | 2694 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2695 | nxt = io_req_find_next(req); |
4d7dd462 | 2696 | __io_free_req(req); |
2a44f467 | 2697 | } |
9b5f7bd9 | 2698 | return nxt; |
2b188cc1 JA |
2699 | } |
2700 | ||
0d85035a | 2701 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2702 | { |
de9b4cca | 2703 | if (req_ref_put_and_test(req)) |
e65ef56d | 2704 | io_free_req(req); |
2b188cc1 JA |
2705 | } |
2706 | ||
91c2f697 | 2707 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2708 | { |
91c2f697 | 2709 | if (req_ref_put_and_test(req)) { |
f237c30a | 2710 | req->io_task_work.func = io_free_req_work; |
4813c377 | 2711 | io_req_task_work_add(req, false); |
543af3a1 | 2712 | } |
216578e5 PB |
2713 | } |
2714 | ||
6c503150 | 2715 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2716 | { |
2717 | /* See comment at the top of this file */ | |
2718 | smp_rmb(); | |
e23de15f | 2719 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2720 | } |
2721 | ||
fb5ccc98 PB |
2722 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2723 | { | |
2724 | struct io_rings *rings = ctx->rings; | |
2725 | ||
2726 | /* make sure SQ entry isn't read before tail */ | |
2727 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2728 | } | |
2729 | ||
4c6e277c JA |
2730 | static inline bool io_run_task_work(void) |
2731 | { | |
7f62d40d | 2732 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || task_work_pending(current)) { |
4c6e277c | 2733 | __set_current_state(TASK_RUNNING); |
7c5d8fa6 EB |
2734 | clear_notify_signal(); |
2735 | if (task_work_pending(current)) | |
2736 | task_work_run(); | |
4c6e277c JA |
2737 | return true; |
2738 | } | |
2739 | ||
2740 | return false; | |
bcda7baa JA |
2741 | } |
2742 | ||
5ba3c874 | 2743 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 2744 | { |
5eef4e87 | 2745 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 2746 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 2747 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 2748 | int nr_events = 0; |
def596e9 JA |
2749 | |
2750 | /* | |
2751 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 2752 | * off our complete list. |
def596e9 | 2753 | */ |
87a115fb | 2754 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 2755 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2756 | |
5eef4e87 PB |
2757 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
2758 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 2759 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2760 | int ret; |
def596e9 JA |
2761 | |
2762 | /* | |
581f9810 BM |
2763 | * Move completed and retryable entries to our local lists. |
2764 | * If we find a request that requires polling, break out | |
2765 | * and complete those lists first, if we have entries there. | |
def596e9 | 2766 | */ |
e3f721e6 | 2767 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2768 | break; |
2769 | ||
b688f11e | 2770 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
2771 | if (unlikely(ret < 0)) |
2772 | return ret; | |
2773 | else if (ret) | |
ef99b2d3 | 2774 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2775 | |
3aadc23e | 2776 | /* iopoll may have completed current req */ |
b688f11e JA |
2777 | if (!rq_list_empty(iob.req_list) || |
2778 | READ_ONCE(req->iopoll_completed)) | |
e3f721e6 | 2779 | break; |
def596e9 JA |
2780 | } |
2781 | ||
b688f11e JA |
2782 | if (!rq_list_empty(iob.req_list)) |
2783 | iob.complete(&iob); | |
5eef4e87 PB |
2784 | else if (!pos) |
2785 | return 0; | |
def596e9 | 2786 | |
5eef4e87 PB |
2787 | prev = start; |
2788 | wq_list_for_each_resume(pos, prev) { | |
2789 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
2790 | ||
b3fa03fd PB |
2791 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
2792 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 2793 | break; |
83a13a41 PB |
2794 | if (unlikely(req->flags & REQ_F_CQE_SKIP)) |
2795 | continue; | |
d1fd1c20 | 2796 | |
ae4da189 | 2797 | __io_fill_cqe_req(req, req->result, io_put_kbuf(req, 0)); |
e3f721e6 PB |
2798 | nr_events++; |
2799 | } | |
def596e9 | 2800 | |
f5ed3bcd PB |
2801 | if (unlikely(!nr_events)) |
2802 | return 0; | |
2803 | ||
2804 | io_commit_cqring(ctx); | |
2805 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 2806 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 2807 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 2808 | io_free_batch_list(ctx, pos); |
5ba3c874 | 2809 | return nr_events; |
def596e9 JA |
2810 | } |
2811 | ||
def596e9 JA |
2812 | /* |
2813 | * We can't just wait for polled events to come to us, we have to actively | |
2814 | * find and complete them. | |
2815 | */ | |
c072481d | 2816 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2817 | { |
2818 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2819 | return; | |
2820 | ||
2821 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 2822 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 2823 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 2824 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 2825 | break; |
08f5439f JA |
2826 | /* |
2827 | * Ensure we allow local-to-the-cpu processing to take place, | |
2828 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2829 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2830 | */ |
3fcee5a6 PB |
2831 | if (need_resched()) { |
2832 | mutex_unlock(&ctx->uring_lock); | |
2833 | cond_resched(); | |
2834 | mutex_lock(&ctx->uring_lock); | |
2835 | } | |
def596e9 JA |
2836 | } |
2837 | mutex_unlock(&ctx->uring_lock); | |
2838 | } | |
2839 | ||
7668b92a | 2840 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2841 | { |
7668b92a | 2842 | unsigned int nr_events = 0; |
e9979b36 | 2843 | int ret = 0; |
500f9fba | 2844 | |
c7849be9 XW |
2845 | /* |
2846 | * We disallow the app entering submit/complete with polling, but we | |
2847 | * still need to lock the ring to prevent racing with polled issue | |
2848 | * that got punted to a workqueue. | |
2849 | */ | |
2850 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2851 | /* |
2852 | * Don't enter poll loop if we already have events pending. | |
2853 | * If we do, we can potentially be spinning for commands that | |
2854 | * already triggered a CQE (eg in error). | |
2855 | */ | |
5ed7a37d | 2856 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2857 | __io_cqring_overflow_flush(ctx, false); |
2858 | if (io_cqring_events(ctx)) | |
2859 | goto out; | |
def596e9 | 2860 | do { |
500f9fba JA |
2861 | /* |
2862 | * If a submit got punted to a workqueue, we can have the | |
2863 | * application entering polling for a command before it gets | |
2864 | * issued. That app will hold the uring_lock for the duration | |
2865 | * of the poll right here, so we need to take a breather every | |
2866 | * now and then to ensure that the issue has a chance to add | |
2867 | * the poll to the issued list. Otherwise we can spin here | |
2868 | * forever, while the workqueue is stuck trying to acquire the | |
2869 | * very same mutex. | |
2870 | */ | |
5eef4e87 | 2871 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2872 | u32 tail = ctx->cached_cq_tail; |
2873 | ||
500f9fba | 2874 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2875 | io_run_task_work(); |
500f9fba | 2876 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2877 | |
8f487ef2 PB |
2878 | /* some requests don't go through iopoll_list */ |
2879 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 2880 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 2881 | break; |
500f9fba | 2882 | } |
5ba3c874 PB |
2883 | ret = io_do_iopoll(ctx, !min); |
2884 | if (ret < 0) | |
2885 | break; | |
2886 | nr_events += ret; | |
2887 | ret = 0; | |
2888 | } while (nr_events < min && !need_resched()); | |
f39c8a5b | 2889 | out: |
500f9fba | 2890 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2891 | return ret; |
2892 | } | |
2893 | ||
491381ce | 2894 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2895 | { |
491381ce JA |
2896 | /* |
2897 | * Tell lockdep we inherited freeze protection from submission | |
2898 | * thread. | |
2899 | */ | |
2900 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2901 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2902 | |
1c98679d PB |
2903 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2904 | sb_end_write(sb); | |
2b188cc1 JA |
2905 | } |
2906 | } | |
2907 | ||
b63534c4 | 2908 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2909 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2910 | { |
ab454438 | 2911 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2912 | |
d886e185 | 2913 | if (!req_has_async_data(req)) |
ab454438 | 2914 | return !io_req_prep_async(req); |
538941e2 | 2915 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 2916 | return true; |
b63534c4 | 2917 | } |
b63534c4 | 2918 | |
3e6a0d3c | 2919 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2920 | { |
355afaeb | 2921 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2922 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2923 | |
355afaeb JA |
2924 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2925 | return false; | |
3e6a0d3c JA |
2926 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2927 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2928 | return false; |
7c977a58 JA |
2929 | /* |
2930 | * If ref is dying, we might be running poll reap from the exit work. | |
2931 | * Don't attempt to reissue from that path, just let it fail with | |
2932 | * -EAGAIN. | |
2933 | */ | |
3e6a0d3c JA |
2934 | if (percpu_ref_is_dying(&ctx->refs)) |
2935 | return false; | |
ef046888 JA |
2936 | /* |
2937 | * Play it safe and assume not safe to re-import and reissue if we're | |
2938 | * not in the original thread group (or in task context). | |
2939 | */ | |
2940 | if (!same_thread_group(req->task, current) || !in_task()) | |
2941 | return false; | |
3e6a0d3c JA |
2942 | return true; |
2943 | } | |
e82ad485 | 2944 | #else |
a1ff1e3f | 2945 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2946 | { |
2947 | return false; | |
2948 | } | |
e82ad485 | 2949 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2950 | { |
b63534c4 JA |
2951 | return false; |
2952 | } | |
3e6a0d3c | 2953 | #endif |
b63534c4 | 2954 | |
8ef12efe | 2955 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2956 | { |
f63cf519 | 2957 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) { |
b65c128f | 2958 | kiocb_end_write(req); |
f63cf519 JA |
2959 | fsnotify_modify(req->file); |
2960 | } else { | |
2961 | fsnotify_access(req->file); | |
2962 | } | |
258f3a7f | 2963 | if (unlikely(res != req->result)) { |
9532b99b PB |
2964 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
2965 | io_rw_should_reissue(req)) { | |
2966 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2967 | return true; |
9532b99b | 2968 | } |
93d2bcd2 | 2969 | req_set_fail(req); |
8ef12efe | 2970 | req->result = res; |
9532b99b | 2971 | } |
8ef12efe JA |
2972 | return false; |
2973 | } | |
2974 | ||
cc8e9ba7 | 2975 | static inline void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2976 | { |
54daa9b2 | 2977 | int res = req->result; |
126180b9 PB |
2978 | |
2979 | if (*locked) { | |
cc3cec83 | 2980 | io_req_complete_state(req, res, io_put_kbuf(req, 0)); |
fff4e40e | 2981 | io_req_add_compl_list(req); |
126180b9 | 2982 | } else { |
cc3cec83 JA |
2983 | io_req_complete_post(req, res, |
2984 | io_put_kbuf(req, IO_URING_F_UNLOCKED)); | |
126180b9 | 2985 | } |
8ef12efe JA |
2986 | } |
2987 | ||
00f6e68b | 2988 | static void __io_complete_rw(struct io_kiocb *req, long res, |
8ef12efe JA |
2989 | unsigned int issue_flags) |
2990 | { | |
2991 | if (__io_complete_rw_common(req, res)) | |
2992 | return; | |
cc3cec83 JA |
2993 | __io_req_complete(req, issue_flags, req->result, |
2994 | io_put_kbuf(req, issue_flags)); | |
ba816ad6 JA |
2995 | } |
2996 | ||
6b19b766 | 2997 | static void io_complete_rw(struct kiocb *kiocb, long res) |
ba816ad6 | 2998 | { |
9adbd45d | 2999 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 3000 | |
8ef12efe JA |
3001 | if (__io_complete_rw_common(req, res)) |
3002 | return; | |
3003 | req->result = res; | |
3004 | req->io_task_work.func = io_req_task_complete; | |
f28c240e | 3005 | io_req_task_work_add(req, !!(req->ctx->flags & IORING_SETUP_SQPOLL)); |
2b188cc1 JA |
3006 | } |
3007 | ||
6b19b766 | 3008 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) |
def596e9 | 3009 | { |
9adbd45d | 3010 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 3011 | |
491381ce JA |
3012 | if (kiocb->ki_flags & IOCB_WRITE) |
3013 | kiocb_end_write(req); | |
9532b99b | 3014 | if (unlikely(res != req->result)) { |
b66ceaf3 PB |
3015 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
3016 | req->flags |= REQ_F_REISSUE; | |
3017 | return; | |
9532b99b | 3018 | } |
258f3a7f | 3019 | req->result = res; |
8c130827 | 3020 | } |
bbde017a | 3021 | |
b3fa03fd PB |
3022 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
3023 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
3024 | } |
3025 | ||
3026 | /* | |
3027 | * After the iocb has been issued, it's safe to be found on the poll list. | |
3028 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 3029 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
3030 | * accessing the kiocb cookie. |
3031 | */ | |
9882131c | 3032 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
3033 | { |
3034 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 3035 | const bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
cb3d8972 PB |
3036 | |
3037 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
3b44b371 | 3038 | if (unlikely(needs_lock)) |
cb3d8972 | 3039 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
3040 | |
3041 | /* | |
3042 | * Track whether we have multiple files in our lists. This will impact | |
3043 | * how we do polling eventually, not spinning if we're on potentially | |
3044 | * different devices. | |
3045 | */ | |
5eef4e87 | 3046 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
3047 | ctx->poll_multi_queue = false; |
3048 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
3049 | struct io_kiocb *list_req; |
3050 | ||
5eef4e87 PB |
3051 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
3052 | comp_list); | |
30da1b45 | 3053 | if (list_req->file != req->file) |
915b3dde | 3054 | ctx->poll_multi_queue = true; |
def596e9 JA |
3055 | } |
3056 | ||
3057 | /* | |
3058 | * For fast devices, IO may have already completed. If it has, add | |
3059 | * it to the front so we find it first. | |
3060 | */ | |
65a6543d | 3061 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 3062 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 3063 | else |
5eef4e87 | 3064 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 3065 | |
3b44b371 | 3066 | if (unlikely(needs_lock)) { |
cb3d8972 PB |
3067 | /* |
3068 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
3069 | * in sq thread task context or in io worker task context. If | |
3070 | * current task context is sq thread, we don't need to check | |
3071 | * whether should wake up sq thread. | |
3072 | */ | |
3073 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
3074 | wq_has_sleeper(&ctx->sq_data->wait)) | |
3075 | wake_up(&ctx->sq_data->wait); | |
3076 | ||
3077 | mutex_unlock(&ctx->uring_lock); | |
3078 | } | |
def596e9 JA |
3079 | } |
3080 | ||
4503b767 JA |
3081 | static bool io_bdev_nowait(struct block_device *bdev) |
3082 | { | |
9ba0d0c8 | 3083 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
3084 | } |
3085 | ||
2b188cc1 JA |
3086 | /* |
3087 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3088 | * any file. For now, just ensure that anything potentially problematic is done | |
3089 | * inline. | |
3090 | */ | |
88459b50 | 3091 | static bool __io_file_supports_nowait(struct file *file, umode_t mode) |
2b188cc1 | 3092 | { |
4503b767 | 3093 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
3094 | if (IS_ENABLED(CONFIG_BLOCK) && |
3095 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
3096 | return true; |
3097 | return false; | |
3098 | } | |
976517f1 | 3099 | if (S_ISSOCK(mode)) |
2b188cc1 | 3100 | return true; |
4503b767 | 3101 | if (S_ISREG(mode)) { |
4e7b5671 CH |
3102 | if (IS_ENABLED(CONFIG_BLOCK) && |
3103 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
3104 | file->f_op != &io_uring_fops) |
3105 | return true; | |
3106 | return false; | |
3107 | } | |
2b188cc1 | 3108 | |
c5b85625 JA |
3109 | /* any ->read/write should understand O_NONBLOCK */ |
3110 | if (file->f_flags & O_NONBLOCK) | |
3111 | return true; | |
35645ac3 | 3112 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 | 3113 | } |
c5b85625 | 3114 | |
88459b50 PB |
3115 | /* |
3116 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3117 | * any file. For now, just ensure that anything potentially problematic is done | |
3118 | * inline. | |
3119 | */ | |
3120 | static unsigned int io_file_get_flags(struct file *file) | |
3121 | { | |
3122 | umode_t mode = file_inode(file)->i_mode; | |
3123 | unsigned int res = 0; | |
af197f50 | 3124 | |
88459b50 PB |
3125 | if (S_ISREG(mode)) |
3126 | res |= FFS_ISREG; | |
3127 | if (__io_file_supports_nowait(file, mode)) | |
3128 | res |= FFS_NOWAIT; | |
3129 | return res; | |
2b188cc1 JA |
3130 | } |
3131 | ||
35645ac3 | 3132 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 3133 | { |
88459b50 | 3134 | return req->flags & REQ_F_SUPPORT_NOWAIT; |
7b29f92d JA |
3135 | } |
3136 | ||
b9a6b8f9 | 3137 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 3138 | { |
9adbd45d | 3139 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
3140 | unsigned ioprio; |
3141 | int ret; | |
2b188cc1 | 3142 | |
2b188cc1 | 3143 | kiocb->ki_pos = READ_ONCE(sqe->off); |
9adbd45d | 3144 | |
fb27274a PB |
3145 | ioprio = READ_ONCE(sqe->ioprio); |
3146 | if (ioprio) { | |
3147 | ret = ioprio_check_cap(ioprio); | |
3148 | if (ret) | |
3149 | return ret; | |
3150 | ||
3151 | kiocb->ki_ioprio = ioprio; | |
3152 | } else { | |
3153 | kiocb->ki_ioprio = get_current_ioprio(); | |
eae071c9 PB |
3154 | } |
3155 | ||
578c0ee2 | 3156 | req->imu = NULL; |
3529d8c2 JA |
3157 | req->rw.addr = READ_ONCE(sqe->addr); |
3158 | req->rw.len = READ_ONCE(sqe->len); | |
584b0180 | 3159 | req->rw.flags = READ_ONCE(sqe->rw_flags); |
4f4eeba8 | 3160 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3161 | return 0; |
2b188cc1 JA |
3162 | } |
3163 | ||
3164 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3165 | { | |
3166 | switch (ret) { | |
3167 | case -EIOCBQUEUED: | |
3168 | break; | |
3169 | case -ERESTARTSYS: | |
3170 | case -ERESTARTNOINTR: | |
3171 | case -ERESTARTNOHAND: | |
3172 | case -ERESTART_RESTARTBLOCK: | |
3173 | /* | |
3174 | * We can't just restart the syscall, since previously | |
3175 | * submitted sqes may already be in progress. Just fail this | |
3176 | * IO with EINTR. | |
3177 | */ | |
3178 | ret = -EINTR; | |
df561f66 | 3179 | fallthrough; |
2b188cc1 | 3180 | default: |
6b19b766 | 3181 | kiocb->ki_complete(kiocb, ret); |
2b188cc1 JA |
3182 | } |
3183 | } | |
3184 | ||
b4aec400 | 3185 | static inline loff_t *io_kiocb_update_pos(struct io_kiocb *req) |
d34e1e5b DY |
3186 | { |
3187 | struct kiocb *kiocb = &req->rw.kiocb; | |
b4aec400 | 3188 | bool is_stream = req->file->f_mode & FMODE_STREAM; |
d34e1e5b DY |
3189 | |
3190 | if (kiocb->ki_pos == -1) { | |
b4aec400 | 3191 | if (!is_stream) { |
d34e1e5b DY |
3192 | req->flags |= REQ_F_CUR_POS; |
3193 | kiocb->ki_pos = req->file->f_pos; | |
b4aec400 | 3194 | return &kiocb->ki_pos; |
d34e1e5b DY |
3195 | } else { |
3196 | kiocb->ki_pos = 0; | |
b4aec400 | 3197 | return NULL; |
d34e1e5b DY |
3198 | } |
3199 | } | |
b4aec400 | 3200 | return is_stream ? NULL : &kiocb->ki_pos; |
d34e1e5b DY |
3201 | } |
3202 | ||
2ea537ca | 3203 | static void kiocb_done(struct io_kiocb *req, ssize_t ret, |
889fca73 | 3204 | unsigned int issue_flags) |
ba816ad6 | 3205 | { |
e8c2bc1f | 3206 | struct io_async_rw *io = req->async_data; |
ba04291e | 3207 | |
227c0c96 | 3208 | /* add previously done IO, if any */ |
d886e185 | 3209 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 3210 | if (ret < 0) |
e8c2bc1f | 3211 | ret = io->bytes_done; |
227c0c96 | 3212 | else |
e8c2bc1f | 3213 | ret += io->bytes_done; |
227c0c96 JA |
3214 | } |
3215 | ||
ba04291e | 3216 | if (req->flags & REQ_F_CUR_POS) |
2ea537ca PB |
3217 | req->file->f_pos = req->rw.kiocb.ki_pos; |
3218 | if (ret >= 0 && (req->rw.kiocb.ki_complete == io_complete_rw)) | |
00f6e68b | 3219 | __io_complete_rw(req, ret, issue_flags); |
ba816ad6 | 3220 | else |
2ea537ca | 3221 | io_rw_done(&req->rw.kiocb, ret); |
97284637 | 3222 | |
b66ceaf3 | 3223 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 3224 | req->flags &= ~REQ_F_REISSUE; |
b91ef187 | 3225 | if (io_resubmit_prep(req)) |
773af691 | 3226 | io_req_task_queue_reissue(req); |
b91ef187 PB |
3227 | else |
3228 | io_req_task_queue_fail(req, ret); | |
97284637 | 3229 | } |
ba816ad6 JA |
3230 | } |
3231 | ||
eae071c9 PB |
3232 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3233 | struct io_mapped_ubuf *imu) | |
edafccee | 3234 | { |
9adbd45d | 3235 | size_t len = req->rw.len; |
75769e3f | 3236 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 3237 | size_t offset; |
edafccee | 3238 | |
75769e3f | 3239 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
3240 | return -EFAULT; |
3241 | /* not inside the mapped region */ | |
4751f53d | 3242 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
3243 | return -EFAULT; |
3244 | ||
3245 | /* | |
3246 | * May not be a start of buffer, set size appropriately | |
3247 | * and advance us to the beginning. | |
3248 | */ | |
3249 | offset = buf_addr - imu->ubuf; | |
3250 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3251 | |
3252 | if (offset) { | |
3253 | /* | |
3254 | * Don't use iov_iter_advance() here, as it's really slow for | |
3255 | * using the latter parts of a big fixed buffer - it iterates | |
3256 | * over each segment manually. We can cheat a bit here, because | |
3257 | * we know that: | |
3258 | * | |
3259 | * 1) it's a BVEC iter, we set it up | |
3260 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3261 | * first and last bvec | |
3262 | * | |
3263 | * So just find our index, and adjust the iterator afterwards. | |
3264 | * If the offset is within the first bvec (or the whole first | |
3265 | * bvec, just use iov_iter_advance(). This makes it easier | |
3266 | * since we can just skip the first segment, which may not | |
3267 | * be PAGE_SIZE aligned. | |
3268 | */ | |
3269 | const struct bio_vec *bvec = imu->bvec; | |
3270 | ||
3271 | if (offset <= bvec->bv_len) { | |
3272 | iov_iter_advance(iter, offset); | |
3273 | } else { | |
3274 | unsigned long seg_skip; | |
3275 | ||
3276 | /* skip first vec */ | |
3277 | offset -= bvec->bv_len; | |
3278 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3279 | ||
3280 | iter->bvec = bvec + seg_skip; | |
3281 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3282 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3283 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3284 | } |
3285 | } | |
3286 | ||
847595de | 3287 | return 0; |
edafccee JA |
3288 | } |
3289 | ||
5106dd6e JA |
3290 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3291 | unsigned int issue_flags) | |
eae071c9 | 3292 | { |
eae071c9 PB |
3293 | struct io_mapped_ubuf *imu = req->imu; |
3294 | u16 index, buf_index = req->buf_index; | |
3295 | ||
3296 | if (likely(!imu)) { | |
578c0ee2 PB |
3297 | struct io_ring_ctx *ctx = req->ctx; |
3298 | ||
eae071c9 PB |
3299 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3300 | return -EFAULT; | |
5106dd6e | 3301 | io_req_set_rsrc_node(req, ctx, issue_flags); |
eae071c9 PB |
3302 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3303 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3304 | req->imu = imu; | |
3305 | } | |
3306 | return __io_import_fixed(req, rw, iter, imu); | |
3307 | } | |
3308 | ||
bcda7baa JA |
3309 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3310 | { | |
3311 | if (needs_lock) | |
3312 | mutex_unlock(&ctx->uring_lock); | |
3313 | } | |
3314 | ||
3315 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3316 | { | |
3317 | /* | |
3318 | * "Normal" inline submissions always hold the uring_lock, since we | |
3319 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3320 | * The only exception is when we've detached the request and issue it | |
3321 | * from an async worker thread, grab the lock for that case. | |
3322 | */ | |
3323 | if (needs_lock) | |
3324 | mutex_lock(&ctx->uring_lock); | |
3325 | } | |
3326 | ||
dbc7d452 JA |
3327 | static void io_buffer_add_list(struct io_ring_ctx *ctx, |
3328 | struct io_buffer_list *bl, unsigned int bgid) | |
3329 | { | |
3330 | struct list_head *list; | |
3331 | ||
3332 | list = &ctx->io_buffers[hash_32(bgid, IO_BUFFERS_HASH_BITS)]; | |
3333 | INIT_LIST_HEAD(&bl->buf_list); | |
3334 | bl->bgid = bgid; | |
3335 | list_add(&bl->list, list); | |
3336 | } | |
3337 | ||
bcda7baa | 3338 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3339 | int bgid, unsigned int issue_flags) |
bcda7baa | 3340 | { |
30d51dd4 | 3341 | struct io_buffer *kbuf = req->kbuf; |
3b44b371 | 3342 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
dbc7d452 JA |
3343 | struct io_ring_ctx *ctx = req->ctx; |
3344 | struct io_buffer_list *bl; | |
bcda7baa JA |
3345 | |
3346 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3347 | return kbuf; | |
3348 | ||
dbc7d452 | 3349 | io_ring_submit_lock(ctx, needs_lock); |
bcda7baa | 3350 | |
dbc7d452 | 3351 | lockdep_assert_held(&ctx->uring_lock); |
bcda7baa | 3352 | |
dbc7d452 JA |
3353 | bl = io_buffer_get_list(ctx, bgid); |
3354 | if (bl && !list_empty(&bl->buf_list)) { | |
3355 | kbuf = list_first_entry(&bl->buf_list, struct io_buffer, list); | |
3356 | list_del(&kbuf->list); | |
bcda7baa JA |
3357 | if (*len > kbuf->len) |
3358 | *len = kbuf->len; | |
30d51dd4 PB |
3359 | req->flags |= REQ_F_BUFFER_SELECTED; |
3360 | req->kbuf = kbuf; | |
bcda7baa JA |
3361 | } else { |
3362 | kbuf = ERR_PTR(-ENOBUFS); | |
3363 | } | |
3364 | ||
3365 | io_ring_submit_unlock(req->ctx, needs_lock); | |
bcda7baa JA |
3366 | return kbuf; |
3367 | } | |
3368 | ||
4d954c25 | 3369 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3370 | unsigned int issue_flags) |
4d954c25 JA |
3371 | { |
3372 | struct io_buffer *kbuf; | |
4f4eeba8 | 3373 | u16 bgid; |
4d954c25 | 3374 | |
4f4eeba8 | 3375 | bgid = req->buf_index; |
51aac424 | 3376 | kbuf = io_buffer_select(req, len, bgid, issue_flags); |
4d954c25 JA |
3377 | if (IS_ERR(kbuf)) |
3378 | return kbuf; | |
4d954c25 JA |
3379 | return u64_to_user_ptr(kbuf->addr); |
3380 | } | |
3381 | ||
3382 | #ifdef CONFIG_COMPAT | |
3383 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3384 | unsigned int issue_flags) |
4d954c25 JA |
3385 | { |
3386 | struct compat_iovec __user *uiov; | |
3387 | compat_ssize_t clen; | |
3388 | void __user *buf; | |
3389 | ssize_t len; | |
3390 | ||
3391 | uiov = u64_to_user_ptr(req->rw.addr); | |
3392 | if (!access_ok(uiov, sizeof(*uiov))) | |
3393 | return -EFAULT; | |
3394 | if (__get_user(clen, &uiov->iov_len)) | |
3395 | return -EFAULT; | |
3396 | if (clen < 0) | |
3397 | return -EINVAL; | |
3398 | ||
3399 | len = clen; | |
51aac424 | 3400 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3401 | if (IS_ERR(buf)) |
3402 | return PTR_ERR(buf); | |
3403 | iov[0].iov_base = buf; | |
3404 | iov[0].iov_len = (compat_size_t) len; | |
3405 | return 0; | |
3406 | } | |
3407 | #endif | |
3408 | ||
3409 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3410 | unsigned int issue_flags) |
4d954c25 JA |
3411 | { |
3412 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3413 | void __user *buf; | |
3414 | ssize_t len; | |
3415 | ||
3416 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3417 | return -EFAULT; | |
3418 | ||
3419 | len = iov[0].iov_len; | |
3420 | if (len < 0) | |
3421 | return -EINVAL; | |
51aac424 | 3422 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3423 | if (IS_ERR(buf)) |
3424 | return PTR_ERR(buf); | |
3425 | iov[0].iov_base = buf; | |
3426 | iov[0].iov_len = len; | |
3427 | return 0; | |
3428 | } | |
3429 | ||
3430 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3431 | unsigned int issue_flags) |
4d954c25 | 3432 | { |
dddb3e26 | 3433 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 | 3434 | struct io_buffer *kbuf = req->kbuf; |
dddb3e26 | 3435 | |
dddb3e26 JA |
3436 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
3437 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3438 | return 0; |
dddb3e26 | 3439 | } |
dd201662 | 3440 | if (req->rw.len != 1) |
4d954c25 JA |
3441 | return -EINVAL; |
3442 | ||
3443 | #ifdef CONFIG_COMPAT | |
3444 | if (req->ctx->compat) | |
51aac424 | 3445 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
3446 | #endif |
3447 | ||
51aac424 | 3448 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
3449 | } |
3450 | ||
caa8fe6e PB |
3451 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
3452 | struct io_rw_state *s, | |
3453 | unsigned int issue_flags) | |
2b188cc1 | 3454 | { |
5e49c973 | 3455 | struct iov_iter *iter = &s->iter; |
847595de | 3456 | u8 opcode = req->opcode; |
caa8fe6e | 3457 | struct iovec *iovec; |
d1d681b0 PB |
3458 | void __user *buf; |
3459 | size_t sqe_len; | |
4d954c25 | 3460 | ssize_t ret; |
edafccee | 3461 | |
f3251183 | 3462 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
5106dd6e | 3463 | ret = io_import_fixed(req, rw, iter, issue_flags); |
f3251183 PB |
3464 | if (ret) |
3465 | return ERR_PTR(ret); | |
3466 | return NULL; | |
3467 | } | |
2b188cc1 | 3468 | |
bcda7baa | 3469 | /* buffer index only valid with fixed read/write, or buffer select */ |
d1d681b0 | 3470 | if (unlikely(req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))) |
caa8fe6e | 3471 | return ERR_PTR(-EINVAL); |
9adbd45d | 3472 | |
d1d681b0 PB |
3473 | buf = u64_to_user_ptr(req->rw.addr); |
3474 | sqe_len = req->rw.len; | |
9adbd45d | 3475 | |
3a6820f2 | 3476 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3477 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 3478 | buf = io_rw_buffer_select(req, &sqe_len, issue_flags); |
867a23ea | 3479 | if (IS_ERR(buf)) |
898df244 | 3480 | return ERR_CAST(buf); |
3f9d6441 | 3481 | req->rw.len = sqe_len; |
bcda7baa JA |
3482 | } |
3483 | ||
5e49c973 | 3484 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
f3251183 PB |
3485 | if (ret) |
3486 | return ERR_PTR(ret); | |
3487 | return NULL; | |
3a6820f2 JA |
3488 | } |
3489 | ||
caa8fe6e | 3490 | iovec = s->fast_iov; |
4d954c25 | 3491 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 3492 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
f3251183 PB |
3493 | if (ret) |
3494 | return ERR_PTR(ret); | |
3495 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); | |
3496 | return NULL; | |
4d954c25 JA |
3497 | } |
3498 | ||
caa8fe6e | 3499 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 3500 | req->ctx->compat); |
caa8fe6e PB |
3501 | if (unlikely(ret < 0)) |
3502 | return ERR_PTR(ret); | |
3503 | return iovec; | |
2b188cc1 JA |
3504 | } |
3505 | ||
5e49c973 PB |
3506 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
3507 | struct iovec **iovec, struct io_rw_state *s, | |
3508 | unsigned int issue_flags) | |
3509 | { | |
caa8fe6e PB |
3510 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
3511 | if (unlikely(IS_ERR(*iovec))) | |
3512 | return PTR_ERR(*iovec); | |
5e49c973 | 3513 | |
5e49c973 | 3514 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 3515 | return 0; |
2b188cc1 JA |
3516 | } |
3517 | ||
0fef9483 JA |
3518 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3519 | { | |
5b09e37e | 3520 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3521 | } |
3522 | ||
31b51510 | 3523 | /* |
32960613 JA |
3524 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3525 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3526 | */ |
4017eb91 | 3527 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3528 | { |
4017eb91 JA |
3529 | struct kiocb *kiocb = &req->rw.kiocb; |
3530 | struct file *file = req->file; | |
32960613 | 3531 | ssize_t ret = 0; |
af9c45ec | 3532 | loff_t *ppos; |
32960613 JA |
3533 | |
3534 | /* | |
3535 | * Don't support polled IO through this interface, and we can't | |
3536 | * support non-blocking either. For the latter, this just causes | |
3537 | * the kiocb to be handled from an async context. | |
3538 | */ | |
3539 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3540 | return -EOPNOTSUPP; | |
35645ac3 PB |
3541 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
3542 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
3543 | return -EAGAIN; |
3544 | ||
af9c45ec DY |
3545 | ppos = io_kiocb_ppos(kiocb); |
3546 | ||
32960613 | 3547 | while (iov_iter_count(iter)) { |
311ae9e1 | 3548 | struct iovec iovec; |
32960613 JA |
3549 | ssize_t nr; |
3550 | ||
311ae9e1 PB |
3551 | if (!iov_iter_is_bvec(iter)) { |
3552 | iovec = iov_iter_iovec(iter); | |
3553 | } else { | |
4017eb91 JA |
3554 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3555 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3556 | } |
3557 | ||
32960613 JA |
3558 | if (rw == READ) { |
3559 | nr = file->f_op->read(file, iovec.iov_base, | |
af9c45ec | 3560 | iovec.iov_len, ppos); |
32960613 JA |
3561 | } else { |
3562 | nr = file->f_op->write(file, iovec.iov_base, | |
af9c45ec | 3563 | iovec.iov_len, ppos); |
32960613 JA |
3564 | } |
3565 | ||
3566 | if (nr < 0) { | |
3567 | if (!ret) | |
3568 | ret = nr; | |
3569 | break; | |
3570 | } | |
5e929367 | 3571 | ret += nr; |
16c8d2df JA |
3572 | if (!iov_iter_is_bvec(iter)) { |
3573 | iov_iter_advance(iter, nr); | |
3574 | } else { | |
16c8d2df | 3575 | req->rw.addr += nr; |
5e929367 JA |
3576 | req->rw.len -= nr; |
3577 | if (!req->rw.len) | |
3578 | break; | |
16c8d2df | 3579 | } |
32960613 JA |
3580 | if (nr != iovec.iov_len) |
3581 | break; | |
32960613 JA |
3582 | } |
3583 | ||
3584 | return ret; | |
3585 | } | |
3586 | ||
ff6165b2 JA |
3587 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3588 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3589 | { |
e8c2bc1f | 3590 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3591 | |
538941e2 | 3592 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 3593 | rw->free_iovec = iovec; |
227c0c96 | 3594 | rw->bytes_done = 0; |
ff6165b2 | 3595 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3596 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3597 | return; |
b64e3444 | 3598 | if (!iovec) { |
ff6165b2 JA |
3599 | unsigned iov_off = 0; |
3600 | ||
538941e2 | 3601 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
3602 | if (iter->iov != fast_iov) { |
3603 | iov_off = iter->iov - fast_iov; | |
538941e2 | 3604 | rw->s.iter.iov += iov_off; |
ff6165b2 | 3605 | } |
538941e2 PB |
3606 | if (rw->s.fast_iov != fast_iov) |
3607 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3608 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3609 | } else { |
3610 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3611 | } |
3612 | } | |
3613 | ||
8d4af685 | 3614 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3615 | { |
e8c2bc1f JA |
3616 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3617 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
3618 | if (req->async_data) { |
3619 | req->flags |= REQ_F_ASYNC_DATA; | |
3620 | return false; | |
3621 | } | |
3622 | return true; | |
3d9932a8 XW |
3623 | } |
3624 | ||
ff6165b2 | 3625 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 3626 | struct io_rw_state *s, bool force) |
b7bb4f7d | 3627 | { |
26f0505a | 3628 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3629 | return 0; |
d886e185 | 3630 | if (!req_has_async_data(req)) { |
cd658695 JA |
3631 | struct io_async_rw *iorw; |
3632 | ||
6cb78689 | 3633 | if (io_alloc_async_data(req)) { |
6bf985dc | 3634 | kfree(iovec); |
5d204bcf | 3635 | return -ENOMEM; |
6bf985dc | 3636 | } |
b7bb4f7d | 3637 | |
c88598a9 | 3638 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
3639 | iorw = req->async_data; |
3640 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 3641 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 3642 | } |
b7bb4f7d | 3643 | return 0; |
f67676d1 JA |
3644 | } |
3645 | ||
73debe68 | 3646 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3647 | { |
e8c2bc1f | 3648 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 3649 | struct iovec *iov; |
847595de | 3650 | int ret; |
c3e330a4 | 3651 | |
51aac424 | 3652 | /* submission path, ->uring_lock should already be taken */ |
3b44b371 | 3653 | ret = io_import_iovec(rw, req, &iov, &iorw->s, 0); |
c3e330a4 PB |
3654 | if (unlikely(ret < 0)) |
3655 | return ret; | |
3656 | ||
ab0b196c PB |
3657 | iorw->bytes_done = 0; |
3658 | iorw->free_iovec = iov; | |
3659 | if (iov) | |
3660 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3661 | return 0; |
3662 | } | |
3663 | ||
c1dd91d1 | 3664 | /* |
ffdc8dab | 3665 | * This is our waitqueue callback handler, registered through __folio_lock_async() |
c1dd91d1 JA |
3666 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
3667 | * This gets called when the page is unlocked, and we generally expect that to | |
3668 | * happen when the page IO is completed and the page is now uptodate. This will | |
3669 | * queue a task_work based retry of the operation, attempting to copy the data | |
3670 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3671 | * do a thread based blocking retry of the operation. That's the unexpected | |
3672 | * slow path. | |
3673 | */ | |
bcf5a063 JA |
3674 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3675 | int sync, void *arg) | |
3676 | { | |
3677 | struct wait_page_queue *wpq; | |
3678 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3679 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3680 | |
3681 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3682 | ||
cdc8fcb4 LT |
3683 | if (!wake_page_match(wpq, key)) |
3684 | return 0; | |
3685 | ||
c8d317aa | 3686 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3687 | list_del_init(&wait->entry); |
921b9054 | 3688 | io_req_task_queue(req); |
bcf5a063 JA |
3689 | return 1; |
3690 | } | |
3691 | ||
c1dd91d1 JA |
3692 | /* |
3693 | * This controls whether a given IO request should be armed for async page | |
3694 | * based retry. If we return false here, the request is handed to the async | |
3695 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3696 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3697 | * will either succeed because the page is now uptodate and unlocked, or it | |
3698 | * will register a callback when the page is unlocked at IO completion. Through | |
3699 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3700 | * That retry will attempt the buffered read again. The retry will generally | |
3701 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3702 | * async worker threads for a blocking retry. | |
3703 | */ | |
227c0c96 | 3704 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3705 | { |
e8c2bc1f JA |
3706 | struct io_async_rw *rw = req->async_data; |
3707 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3708 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3709 | |
bcf5a063 JA |
3710 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3711 | if (req->flags & REQ_F_NOWAIT) | |
3712 | return false; | |
f67676d1 | 3713 | |
227c0c96 | 3714 | /* Only for buffered IO */ |
3b2a4439 | 3715 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3716 | return false; |
3b2a4439 | 3717 | |
bcf5a063 JA |
3718 | /* |
3719 | * just use poll if we can, and don't attempt if the fs doesn't | |
3720 | * support callback based unlocks | |
3721 | */ | |
3722 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3723 | return false; | |
f67676d1 | 3724 | |
3b2a4439 JA |
3725 | wait->wait.func = io_async_buf_func; |
3726 | wait->wait.private = req; | |
3727 | wait->wait.flags = 0; | |
3728 | INIT_LIST_HEAD(&wait->wait.entry); | |
3729 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3730 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3731 | kiocb->ki_waitq = wait; |
3b2a4439 | 3732 | return true; |
bcf5a063 JA |
3733 | } |
3734 | ||
aeab9506 | 3735 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 3736 | { |
607b6fb8 | 3737 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 3738 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 3739 | else if (req->file->f_op->read) |
4017eb91 | 3740 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3741 | else |
3742 | return -EINVAL; | |
f67676d1 JA |
3743 | } |
3744 | ||
7db30437 ML |
3745 | static bool need_read_all(struct io_kiocb *req) |
3746 | { | |
3747 | return req->flags & REQ_F_ISREG || | |
3748 | S_ISBLK(file_inode(req->file)->i_mode); | |
3749 | } | |
3750 | ||
584b0180 JA |
3751 | static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) |
3752 | { | |
3753 | struct kiocb *kiocb = &req->rw.kiocb; | |
3754 | struct io_ring_ctx *ctx = req->ctx; | |
3755 | struct file *file = req->file; | |
3756 | int ret; | |
3757 | ||
3758 | if (unlikely(!file || !(file->f_mode & mode))) | |
3759 | return -EBADF; | |
3760 | ||
3761 | if (!io_req_ffs_set(req)) | |
3762 | req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; | |
3763 | ||
3764 | kiocb->ki_flags = iocb_flags(file); | |
3765 | ret = kiocb_set_rw_flags(kiocb, req->rw.flags); | |
3766 | if (unlikely(ret)) | |
3767 | return ret; | |
3768 | ||
3769 | /* | |
3770 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
3771 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
3772 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
3773 | */ | |
3774 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
3775 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) | |
3776 | req->flags |= REQ_F_NOWAIT; | |
3777 | ||
3778 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
3779 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) | |
3780 | return -EOPNOTSUPP; | |
3781 | ||
3782 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; | |
3783 | kiocb->ki_complete = io_complete_rw_iopoll; | |
3784 | req->iopoll_completed = 0; | |
3785 | } else { | |
3786 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3787 | return -EINVAL; | |
3788 | kiocb->ki_complete = io_complete_rw; | |
3789 | } | |
3790 | ||
3791 | return 0; | |
3792 | } | |
3793 | ||
889fca73 | 3794 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3795 | { |
607b6fb8 | 3796 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3797 | struct iovec *iovec; |
9adbd45d | 3798 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3799 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 3800 | struct io_async_rw *rw; |
cd658695 | 3801 | ssize_t ret, ret2; |
b4aec400 | 3802 | loff_t *ppos; |
ff6165b2 | 3803 | |
607b6fb8 PB |
3804 | if (!req_has_async_data(req)) { |
3805 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3806 | if (unlikely(ret < 0)) | |
3807 | return ret; | |
3808 | } else { | |
2be2eb02 JA |
3809 | /* |
3810 | * Safe and required to re-import if we're using provided | |
3811 | * buffers, as we dropped the selected one before retry. | |
3812 | */ | |
3813 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3814 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3815 | if (unlikely(ret < 0)) | |
3816 | return ret; | |
3817 | } | |
3818 | ||
d886e185 | 3819 | rw = req->async_data; |
c88598a9 | 3820 | s = &rw->s; |
cd658695 JA |
3821 | /* |
3822 | * We come here from an earlier attempt, restore our state to | |
3823 | * match in case it doesn't. It's cheap enough that we don't | |
3824 | * need to make this conditional. | |
3825 | */ | |
c88598a9 | 3826 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 3827 | iovec = NULL; |
2846c481 | 3828 | } |
584b0180 JA |
3829 | ret = io_rw_init_file(req, FMODE_READ); |
3830 | if (unlikely(ret)) | |
3831 | return ret; | |
c88598a9 | 3832 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3833 | |
607b6fb8 PB |
3834 | if (force_nonblock) { |
3835 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3836 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
3837 | ret = io_setup_async_rw(req, iovec, s, true); |
3838 | return ret ?: -EAGAIN; | |
3839 | } | |
a88fc400 | 3840 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
3841 | } else { |
3842 | /* Ensure we clear previously set non-block flag */ | |
3843 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 3844 | } |
9e645e11 | 3845 | |
b4aec400 | 3846 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 3847 | |
b4aec400 | 3848 | ret = rw_verify_area(READ, req->file, ppos, req->result); |
5ea5dd45 PB |
3849 | if (unlikely(ret)) { |
3850 | kfree(iovec); | |
3851 | return ret; | |
3852 | } | |
2b188cc1 | 3853 | |
c88598a9 | 3854 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 3855 | |
230d50d4 | 3856 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3857 | req->flags &= ~REQ_F_REISSUE; |
9af177ee JA |
3858 | /* if we can poll, just do that */ |
3859 | if (req->opcode == IORING_OP_READ && file_can_poll(req->file)) | |
3860 | return -EAGAIN; | |
eefdf30f JA |
3861 | /* IOPOLL retry should happen for io-wq threads */ |
3862 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3863 | goto done; |
75c668cd PB |
3864 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3865 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3866 | goto done; |
f38c7e3a | 3867 | ret = 0; |
230d50d4 JA |
3868 | } else if (ret == -EIOCBQUEUED) { |
3869 | goto out_free; | |
f80a50a6 | 3870 | } else if (ret == req->result || ret <= 0 || !force_nonblock || |
7db30437 | 3871 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3872 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3873 | goto done; |
227c0c96 JA |
3874 | } |
3875 | ||
cd658695 JA |
3876 | /* |
3877 | * Don't depend on the iter state matching what was consumed, or being | |
3878 | * untouched in case of error. Restore it and we'll advance it | |
3879 | * manually if we need to. | |
3880 | */ | |
c88598a9 | 3881 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3882 | |
c88598a9 | 3883 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
3884 | if (ret2) |
3885 | return ret2; | |
3886 | ||
fe1cdd55 | 3887 | iovec = NULL; |
e8c2bc1f | 3888 | rw = req->async_data; |
c88598a9 | 3889 | s = &rw->s; |
cd658695 JA |
3890 | /* |
3891 | * Now use our persistent iterator and state, if we aren't already. | |
3892 | * We've restored and mapped the iter to match. | |
3893 | */ | |
227c0c96 | 3894 | |
b23df91b | 3895 | do { |
cd658695 JA |
3896 | /* |
3897 | * We end up here because of a partial read, either from | |
3898 | * above or inside this loop. Advance the iter by the bytes | |
3899 | * that were consumed. | |
3900 | */ | |
c88598a9 PB |
3901 | iov_iter_advance(&s->iter, ret); |
3902 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 3903 | break; |
b23df91b | 3904 | rw->bytes_done += ret; |
c88598a9 | 3905 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 3906 | |
b23df91b PB |
3907 | /* if we can retry, do so with the callbacks armed */ |
3908 | if (!io_rw_should_retry(req)) { | |
3909 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3910 | return -EAGAIN; | |
3911 | } | |
3912 | ||
3913 | /* | |
3914 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3915 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3916 | * desired page gets unlocked. We can also get a partial read | |
3917 | * here, and if we do, then just retry at the new offset. | |
3918 | */ | |
c88598a9 | 3919 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
3920 | if (ret == -EIOCBQUEUED) |
3921 | return 0; | |
227c0c96 | 3922 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3923 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 3924 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3925 | } while (ret > 0); |
227c0c96 | 3926 | done: |
2ea537ca | 3927 | kiocb_done(req, ret, issue_flags); |
fe1cdd55 PB |
3928 | out_free: |
3929 | /* it's faster to check here then delegate to kfree */ | |
3930 | if (iovec) | |
3931 | kfree(iovec); | |
5ea5dd45 | 3932 | return 0; |
2b188cc1 JA |
3933 | } |
3934 | ||
889fca73 | 3935 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3936 | { |
607b6fb8 | 3937 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3938 | struct iovec *iovec; |
9adbd45d | 3939 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3940 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3941 | ssize_t ret, ret2; |
b4aec400 | 3942 | loff_t *ppos; |
2b188cc1 | 3943 | |
607b6fb8 | 3944 | if (!req_has_async_data(req)) { |
5e49c973 PB |
3945 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
3946 | if (unlikely(ret < 0)) | |
2846c481 | 3947 | return ret; |
607b6fb8 PB |
3948 | } else { |
3949 | struct io_async_rw *rw = req->async_data; | |
3950 | ||
3951 | s = &rw->s; | |
3952 | iov_iter_restore(&s->iter, &s->iter_state); | |
2846c481 | 3953 | iovec = NULL; |
2846c481 | 3954 | } |
584b0180 JA |
3955 | ret = io_rw_init_file(req, FMODE_WRITE); |
3956 | if (unlikely(ret)) | |
3957 | return ret; | |
c88598a9 | 3958 | req->result = iov_iter_count(&s->iter); |
2b188cc1 | 3959 | |
607b6fb8 PB |
3960 | if (force_nonblock) { |
3961 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3962 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 3963 | goto copy_iov; |
fd6c2e4c | 3964 | |
607b6fb8 PB |
3965 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3966 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3967 | (req->flags & REQ_F_ISREG)) | |
3968 | goto copy_iov; | |
31b51510 | 3969 | |
607b6fb8 PB |
3970 | kiocb->ki_flags |= IOCB_NOWAIT; |
3971 | } else { | |
3972 | /* Ensure we clear previously set non-block flag */ | |
3973 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
3974 | } | |
31b51510 | 3975 | |
b4aec400 | 3976 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 3977 | |
b4aec400 | 3978 | ret = rw_verify_area(WRITE, req->file, ppos, req->result); |
fa15bafb PB |
3979 | if (unlikely(ret)) |
3980 | goto out_free; | |
4ed734b0 | 3981 | |
fa15bafb PB |
3982 | /* |
3983 | * Open-code file_start_write here to grab freeze protection, | |
3984 | * which will be released by another thread in | |
3985 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3986 | * released so that it doesn't complain about the held lock when | |
3987 | * we return to userspace. | |
3988 | */ | |
3989 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3990 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3991 | __sb_writers_release(file_inode(req->file)->i_sb, |
3992 | SB_FREEZE_WRITE); | |
3993 | } | |
3994 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3995 | |
35645ac3 | 3996 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 3997 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 3998 | else if (req->file->f_op->write) |
c88598a9 | 3999 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
4000 | else |
4001 | ret2 = -EINVAL; | |
4ed734b0 | 4002 | |
6ad7f233 PB |
4003 | if (req->flags & REQ_F_REISSUE) { |
4004 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 4005 | ret2 = -EAGAIN; |
6ad7f233 | 4006 | } |
230d50d4 | 4007 | |
fa15bafb PB |
4008 | /* |
4009 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
4010 | * retry them without IOCB_NOWAIT. | |
4011 | */ | |
4012 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
4013 | ret2 = -EAGAIN; | |
75c668cd PB |
4014 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
4015 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 4016 | goto done; |
fa15bafb | 4017 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 4018 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 4019 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 4020 | goto copy_iov; |
355afaeb | 4021 | done: |
2ea537ca | 4022 | kiocb_done(req, ret2, issue_flags); |
fa15bafb | 4023 | } else { |
f67676d1 | 4024 | copy_iov: |
c88598a9 PB |
4025 | iov_iter_restore(&s->iter, &s->iter_state); |
4026 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 4027 | return ret ?: -EAGAIN; |
2b188cc1 | 4028 | } |
31b51510 | 4029 | out_free: |
f261c168 | 4030 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 4031 | if (iovec) |
6f2cc166 | 4032 | kfree(iovec); |
2b188cc1 JA |
4033 | return ret; |
4034 | } | |
4035 | ||
80a261fd JA |
4036 | static int io_renameat_prep(struct io_kiocb *req, |
4037 | const struct io_uring_sqe *sqe) | |
4038 | { | |
4039 | struct io_rename *ren = &req->rename; | |
4040 | const char __user *oldf, *newf; | |
4041 | ||
ed7eb259 JA |
4042 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4043 | return -EINVAL; | |
26578cda | 4044 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 4045 | return -EINVAL; |
80a261fd JA |
4046 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4047 | return -EBADF; | |
4048 | ||
4049 | ren->old_dfd = READ_ONCE(sqe->fd); | |
4050 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4051 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4052 | ren->new_dfd = READ_ONCE(sqe->len); | |
4053 | ren->flags = READ_ONCE(sqe->rename_flags); | |
4054 | ||
4055 | ren->oldpath = getname(oldf); | |
4056 | if (IS_ERR(ren->oldpath)) | |
4057 | return PTR_ERR(ren->oldpath); | |
4058 | ||
4059 | ren->newpath = getname(newf); | |
4060 | if (IS_ERR(ren->newpath)) { | |
4061 | putname(ren->oldpath); | |
4062 | return PTR_ERR(ren->newpath); | |
4063 | } | |
4064 | ||
4065 | req->flags |= REQ_F_NEED_CLEANUP; | |
4066 | return 0; | |
4067 | } | |
4068 | ||
45d189c6 | 4069 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
4070 | { |
4071 | struct io_rename *ren = &req->rename; | |
4072 | int ret; | |
4073 | ||
45d189c6 | 4074 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
4075 | return -EAGAIN; |
4076 | ||
4077 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
4078 | ren->newpath, ren->flags); | |
4079 | ||
4080 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4081 | if (ret < 0) | |
93d2bcd2 | 4082 | req_set_fail(req); |
80a261fd JA |
4083 | io_req_complete(req, ret); |
4084 | return 0; | |
4085 | } | |
4086 | ||
14a1143b JA |
4087 | static int io_unlinkat_prep(struct io_kiocb *req, |
4088 | const struct io_uring_sqe *sqe) | |
4089 | { | |
4090 | struct io_unlink *un = &req->unlink; | |
4091 | const char __user *fname; | |
4092 | ||
22634bc5 JA |
4093 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4094 | return -EINVAL; | |
26578cda PB |
4095 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
4096 | sqe->splice_fd_in) | |
22634bc5 | 4097 | return -EINVAL; |
14a1143b JA |
4098 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4099 | return -EBADF; | |
4100 | ||
4101 | un->dfd = READ_ONCE(sqe->fd); | |
4102 | ||
4103 | un->flags = READ_ONCE(sqe->unlink_flags); | |
4104 | if (un->flags & ~AT_REMOVEDIR) | |
4105 | return -EINVAL; | |
4106 | ||
4107 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4108 | un->filename = getname(fname); | |
4109 | if (IS_ERR(un->filename)) | |
4110 | return PTR_ERR(un->filename); | |
4111 | ||
4112 | req->flags |= REQ_F_NEED_CLEANUP; | |
4113 | return 0; | |
4114 | } | |
4115 | ||
45d189c6 | 4116 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
4117 | { |
4118 | struct io_unlink *un = &req->unlink; | |
4119 | int ret; | |
4120 | ||
45d189c6 | 4121 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
4122 | return -EAGAIN; |
4123 | ||
4124 | if (un->flags & AT_REMOVEDIR) | |
4125 | ret = do_rmdir(un->dfd, un->filename); | |
4126 | else | |
4127 | ret = do_unlinkat(un->dfd, un->filename); | |
4128 | ||
4129 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4130 | if (ret < 0) | |
93d2bcd2 | 4131 | req_set_fail(req); |
14a1143b JA |
4132 | io_req_complete(req, ret); |
4133 | return 0; | |
4134 | } | |
4135 | ||
e34a02dc DK |
4136 | static int io_mkdirat_prep(struct io_kiocb *req, |
4137 | const struct io_uring_sqe *sqe) | |
4138 | { | |
4139 | struct io_mkdir *mkd = &req->mkdir; | |
4140 | const char __user *fname; | |
4141 | ||
4142 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4143 | return -EINVAL; | |
4144 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
4145 | sqe->splice_fd_in) | |
4146 | return -EINVAL; | |
4147 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4148 | return -EBADF; | |
4149 | ||
4150 | mkd->dfd = READ_ONCE(sqe->fd); | |
4151 | mkd->mode = READ_ONCE(sqe->len); | |
4152 | ||
4153 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4154 | mkd->filename = getname(fname); | |
4155 | if (IS_ERR(mkd->filename)) | |
4156 | return PTR_ERR(mkd->filename); | |
4157 | ||
4158 | req->flags |= REQ_F_NEED_CLEANUP; | |
4159 | return 0; | |
4160 | } | |
4161 | ||
04f34081 | 4162 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
4163 | { |
4164 | struct io_mkdir *mkd = &req->mkdir; | |
4165 | int ret; | |
4166 | ||
4167 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4168 | return -EAGAIN; | |
4169 | ||
4170 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
4171 | ||
4172 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4173 | if (ret < 0) | |
4174 | req_set_fail(req); | |
4175 | io_req_complete(req, ret); | |
4176 | return 0; | |
4177 | } | |
4178 | ||
7a8721f8 DK |
4179 | static int io_symlinkat_prep(struct io_kiocb *req, |
4180 | const struct io_uring_sqe *sqe) | |
4181 | { | |
4182 | struct io_symlink *sl = &req->symlink; | |
4183 | const char __user *oldpath, *newpath; | |
4184 | ||
4185 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4186 | return -EINVAL; | |
4187 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
4188 | sqe->splice_fd_in) | |
4189 | return -EINVAL; | |
4190 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4191 | return -EBADF; | |
4192 | ||
4193 | sl->new_dfd = READ_ONCE(sqe->fd); | |
4194 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4195 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4196 | ||
4197 | sl->oldpath = getname(oldpath); | |
4198 | if (IS_ERR(sl->oldpath)) | |
4199 | return PTR_ERR(sl->oldpath); | |
4200 | ||
4201 | sl->newpath = getname(newpath); | |
4202 | if (IS_ERR(sl->newpath)) { | |
4203 | putname(sl->oldpath); | |
4204 | return PTR_ERR(sl->newpath); | |
4205 | } | |
4206 | ||
4207 | req->flags |= REQ_F_NEED_CLEANUP; | |
4208 | return 0; | |
4209 | } | |
4210 | ||
04f34081 | 4211 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
4212 | { |
4213 | struct io_symlink *sl = &req->symlink; | |
4214 | int ret; | |
4215 | ||
4216 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4217 | return -EAGAIN; | |
4218 | ||
4219 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
4220 | ||
4221 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4222 | if (ret < 0) | |
4223 | req_set_fail(req); | |
4224 | io_req_complete(req, ret); | |
4225 | return 0; | |
4226 | } | |
4227 | ||
cf30da90 DK |
4228 | static int io_linkat_prep(struct io_kiocb *req, |
4229 | const struct io_uring_sqe *sqe) | |
4230 | { | |
4231 | struct io_hardlink *lnk = &req->hardlink; | |
4232 | const char __user *oldf, *newf; | |
4233 | ||
4234 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4235 | return -EINVAL; | |
4236 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
4237 | return -EINVAL; | |
4238 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4239 | return -EBADF; | |
4240 | ||
4241 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
4242 | lnk->new_dfd = READ_ONCE(sqe->len); | |
4243 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4244 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4245 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
4246 | ||
4247 | lnk->oldpath = getname(oldf); | |
4248 | if (IS_ERR(lnk->oldpath)) | |
4249 | return PTR_ERR(lnk->oldpath); | |
4250 | ||
4251 | lnk->newpath = getname(newf); | |
4252 | if (IS_ERR(lnk->newpath)) { | |
4253 | putname(lnk->oldpath); | |
4254 | return PTR_ERR(lnk->newpath); | |
4255 | } | |
4256 | ||
4257 | req->flags |= REQ_F_NEED_CLEANUP; | |
4258 | return 0; | |
4259 | } | |
4260 | ||
04f34081 | 4261 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
4262 | { |
4263 | struct io_hardlink *lnk = &req->hardlink; | |
4264 | int ret; | |
4265 | ||
4266 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4267 | return -EAGAIN; | |
4268 | ||
4269 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
4270 | lnk->newpath, lnk->flags); | |
4271 | ||
4272 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4273 | if (ret < 0) | |
4274 | req_set_fail(req); | |
4275 | io_req_complete(req, ret); | |
4276 | return 0; | |
4277 | } | |
4278 | ||
36f4fa68 JA |
4279 | static int io_shutdown_prep(struct io_kiocb *req, |
4280 | const struct io_uring_sqe *sqe) | |
4281 | { | |
4282 | #if defined(CONFIG_NET) | |
4283 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4284 | return -EINVAL; | |
26578cda PB |
4285 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
4286 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
4287 | return -EINVAL; |
4288 | ||
4289 | req->shutdown.how = READ_ONCE(sqe->len); | |
4290 | return 0; | |
4291 | #else | |
4292 | return -EOPNOTSUPP; | |
4293 | #endif | |
4294 | } | |
4295 | ||
45d189c6 | 4296 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
4297 | { |
4298 | #if defined(CONFIG_NET) | |
4299 | struct socket *sock; | |
4300 | int ret; | |
4301 | ||
45d189c6 | 4302 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
4303 | return -EAGAIN; |
4304 | ||
48aba79b | 4305 | sock = sock_from_file(req->file); |
36f4fa68 | 4306 | if (unlikely(!sock)) |
48aba79b | 4307 | return -ENOTSOCK; |
36f4fa68 JA |
4308 | |
4309 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 4310 | if (ret < 0) |
93d2bcd2 | 4311 | req_set_fail(req); |
36f4fa68 JA |
4312 | io_req_complete(req, ret); |
4313 | return 0; | |
4314 | #else | |
4315 | return -EOPNOTSUPP; | |
4316 | #endif | |
4317 | } | |
4318 | ||
f2a8d5c7 PB |
4319 | static int __io_splice_prep(struct io_kiocb *req, |
4320 | const struct io_uring_sqe *sqe) | |
7d67af2c | 4321 | { |
fe7e3257 | 4322 | struct io_splice *sp = &req->splice; |
7d67af2c | 4323 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 4324 | |
3232dd02 PB |
4325 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4326 | return -EINVAL; | |
7d67af2c | 4327 | |
7d67af2c PB |
4328 | sp->len = READ_ONCE(sqe->len); |
4329 | sp->flags = READ_ONCE(sqe->splice_flags); | |
7d67af2c PB |
4330 | if (unlikely(sp->flags & ~valid_flags)) |
4331 | return -EINVAL; | |
a3e4bc23 | 4332 | sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); |
7d67af2c PB |
4333 | return 0; |
4334 | } | |
4335 | ||
f2a8d5c7 PB |
4336 | static int io_tee_prep(struct io_kiocb *req, |
4337 | const struct io_uring_sqe *sqe) | |
4338 | { | |
4339 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
4340 | return -EINVAL; | |
4341 | return __io_splice_prep(req, sqe); | |
4342 | } | |
4343 | ||
45d189c6 | 4344 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
4345 | { |
4346 | struct io_splice *sp = &req->splice; | |
f2a8d5c7 PB |
4347 | struct file *out = sp->file_out; |
4348 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
a3e4bc23 | 4349 | struct file *in; |
f2a8d5c7 PB |
4350 | long ret = 0; |
4351 | ||
45d189c6 | 4352 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 | 4353 | return -EAGAIN; |
a3e4bc23 | 4354 | |
5106dd6e JA |
4355 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
4356 | in = io_file_get_fixed(req, sp->splice_fd_in, IO_URING_F_UNLOCKED); | |
4357 | else | |
4358 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
4359 | if (!in) { |
4360 | ret = -EBADF; | |
4361 | goto done; | |
4362 | } | |
4363 | ||
f2a8d5c7 PB |
4364 | if (sp->len) |
4365 | ret = do_tee(in, out, sp->len, flags); | |
4366 | ||
e1d767f0 PB |
4367 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4368 | io_put_file(in); | |
a3e4bc23 | 4369 | done: |
f2a8d5c7 | 4370 | if (ret != sp->len) |
93d2bcd2 | 4371 | req_set_fail(req); |
e1e16097 | 4372 | io_req_complete(req, ret); |
f2a8d5c7 PB |
4373 | return 0; |
4374 | } | |
4375 | ||
4376 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4377 | { | |
fe7e3257 | 4378 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
4379 | |
4380 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4381 | sp->off_out = READ_ONCE(sqe->off); | |
4382 | return __io_splice_prep(req, sqe); | |
4383 | } | |
4384 | ||
45d189c6 | 4385 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4386 | { |
4387 | struct io_splice *sp = &req->splice; | |
7d67af2c PB |
4388 | struct file *out = sp->file_out; |
4389 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4390 | loff_t *poff_in, *poff_out; | |
a3e4bc23 | 4391 | struct file *in; |
c9687426 | 4392 | long ret = 0; |
7d67af2c | 4393 | |
45d189c6 | 4394 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4395 | return -EAGAIN; |
7d67af2c | 4396 | |
5106dd6e JA |
4397 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
4398 | in = io_file_get_fixed(req, sp->splice_fd_in, IO_URING_F_UNLOCKED); | |
4399 | else | |
4400 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
4401 | if (!in) { |
4402 | ret = -EBADF; | |
4403 | goto done; | |
4404 | } | |
4405 | ||
7d67af2c PB |
4406 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; |
4407 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4408 | |
948a7749 | 4409 | if (sp->len) |
c9687426 | 4410 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4411 | |
e1d767f0 PB |
4412 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4413 | io_put_file(in); | |
a3e4bc23 | 4414 | done: |
7d67af2c | 4415 | if (ret != sp->len) |
93d2bcd2 | 4416 | req_set_fail(req); |
e1e16097 | 4417 | io_req_complete(req, ret); |
7d67af2c PB |
4418 | return 0; |
4419 | } | |
4420 | ||
2b188cc1 JA |
4421 | /* |
4422 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4423 | */ | |
889fca73 | 4424 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4425 | { |
4426 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4427 | |
def596e9 JA |
4428 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4429 | return -EINVAL; | |
4430 | ||
889fca73 | 4431 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4432 | return 0; |
4433 | } | |
4434 | ||
4f57f06c JA |
4435 | static int io_msg_ring_prep(struct io_kiocb *req, |
4436 | const struct io_uring_sqe *sqe) | |
4437 | { | |
f3b6a41e JA |
4438 | if (unlikely(sqe->addr || sqe->ioprio || sqe->rw_flags || |
4439 | sqe->splice_fd_in || sqe->buf_index || sqe->personality)) | |
4f57f06c JA |
4440 | return -EINVAL; |
4441 | ||
4f57f06c JA |
4442 | req->msg.user_data = READ_ONCE(sqe->off); |
4443 | req->msg.len = READ_ONCE(sqe->len); | |
4444 | return 0; | |
4445 | } | |
4446 | ||
4447 | static int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags) | |
4448 | { | |
4449 | struct io_ring_ctx *target_ctx; | |
4450 | struct io_msg *msg = &req->msg; | |
4f57f06c | 4451 | bool filled; |
3f1d52ab | 4452 | int ret; |
4f57f06c | 4453 | |
3f1d52ab JA |
4454 | ret = -EBADFD; |
4455 | if (req->file->f_op != &io_uring_fops) | |
4456 | goto done; | |
4f57f06c | 4457 | |
3f1d52ab | 4458 | ret = -EOVERFLOW; |
4f57f06c JA |
4459 | target_ctx = req->file->private_data; |
4460 | ||
4461 | spin_lock(&target_ctx->completion_lock); | |
7ef66d18 | 4462 | filled = io_fill_cqe_aux(target_ctx, msg->user_data, msg->len, 0); |
4f57f06c JA |
4463 | io_commit_cqring(target_ctx); |
4464 | spin_unlock(&target_ctx->completion_lock); | |
4465 | ||
4466 | if (filled) { | |
4467 | io_cqring_ev_posted(target_ctx); | |
4468 | ret = 0; | |
4469 | } | |
4470 | ||
3f1d52ab | 4471 | done: |
9666d420 JA |
4472 | if (ret < 0) |
4473 | req_set_fail(req); | |
4f57f06c JA |
4474 | __io_req_complete(req, issue_flags, ret, 0); |
4475 | return 0; | |
4476 | } | |
4477 | ||
1155c76a | 4478 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4479 | { |
6b06314c | 4480 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4481 | |
6b06314c | 4482 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4483 | return -EINVAL; |
26578cda PB |
4484 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4485 | sqe->splice_fd_in)) | |
c992fe29 CH |
4486 | return -EINVAL; |
4487 | ||
8ed8d3c3 JA |
4488 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4489 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4490 | return -EINVAL; | |
4491 | ||
4492 | req->sync.off = READ_ONCE(sqe->off); | |
4493 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4494 | return 0; |
4495 | } | |
4496 | ||
45d189c6 | 4497 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4498 | { |
8ed8d3c3 | 4499 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4500 | int ret; |
4501 | ||
ac45abc0 | 4502 | /* fsync always requires a blocking context */ |
45d189c6 | 4503 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4504 | return -EAGAIN; |
4505 | ||
9adbd45d | 4506 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4507 | end > 0 ? end : LLONG_MAX, |
4508 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4509 | if (ret < 0) | |
93d2bcd2 | 4510 | req_set_fail(req); |
e1e16097 | 4511 | io_req_complete(req, ret); |
c992fe29 CH |
4512 | return 0; |
4513 | } | |
4514 | ||
d63d1b5e JA |
4515 | static int io_fallocate_prep(struct io_kiocb *req, |
4516 | const struct io_uring_sqe *sqe) | |
4517 | { | |
26578cda PB |
4518 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4519 | sqe->splice_fd_in) | |
d63d1b5e | 4520 | return -EINVAL; |
3232dd02 PB |
4521 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4522 | return -EINVAL; | |
d63d1b5e JA |
4523 | |
4524 | req->sync.off = READ_ONCE(sqe->off); | |
4525 | req->sync.len = READ_ONCE(sqe->addr); | |
4526 | req->sync.mode = READ_ONCE(sqe->len); | |
4527 | return 0; | |
4528 | } | |
4529 | ||
45d189c6 | 4530 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4531 | { |
ac45abc0 PB |
4532 | int ret; |
4533 | ||
d63d1b5e | 4534 | /* fallocate always requiring blocking context */ |
45d189c6 | 4535 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4536 | return -EAGAIN; |
ac45abc0 PB |
4537 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4538 | req->sync.len); | |
ac45abc0 | 4539 | if (ret < 0) |
93d2bcd2 | 4540 | req_set_fail(req); |
f63cf519 JA |
4541 | else |
4542 | fsnotify_modify(req->file); | |
e1e16097 | 4543 | io_req_complete(req, ret); |
5d17b4a4 JA |
4544 | return 0; |
4545 | } | |
4546 | ||
ec65fea5 | 4547 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4548 | { |
f8748881 | 4549 | const char __user *fname; |
15b71abe | 4550 | int ret; |
b7bb4f7d | 4551 | |
d3fddf6d PB |
4552 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4553 | return -EINVAL; | |
b9445598 | 4554 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4555 | return -EINVAL; |
ec65fea5 | 4556 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4557 | return -EBADF; |
03b1230c | 4558 | |
ec65fea5 PB |
4559 | /* open.how should be already initialised */ |
4560 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4561 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4562 | |
25e72d10 PB |
4563 | req->open.dfd = READ_ONCE(sqe->fd); |
4564 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4565 | req->open.filename = getname(fname); |
15b71abe JA |
4566 | if (IS_ERR(req->open.filename)) { |
4567 | ret = PTR_ERR(req->open.filename); | |
4568 | req->open.filename = NULL; | |
4569 | return ret; | |
4570 | } | |
b9445598 PB |
4571 | |
4572 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4573 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4574 | return -EINVAL; | |
4575 | ||
4022e7af | 4576 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4577 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4578 | return 0; |
03b1230c JA |
4579 | } |
4580 | ||
ec65fea5 PB |
4581 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4582 | { | |
d3fddf6d PB |
4583 | u64 mode = READ_ONCE(sqe->len); |
4584 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4585 | |
ec65fea5 PB |
4586 | req->open.how = build_open_how(flags, mode); |
4587 | return __io_openat_prep(req, sqe); | |
4588 | } | |
4589 | ||
cebdb986 | 4590 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4591 | { |
cebdb986 | 4592 | struct open_how __user *how; |
cebdb986 | 4593 | size_t len; |
0fa03c62 JA |
4594 | int ret; |
4595 | ||
cebdb986 JA |
4596 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4597 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4598 | if (len < OPEN_HOW_SIZE_VER0) |
4599 | return -EINVAL; | |
3529d8c2 | 4600 | |
cebdb986 JA |
4601 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4602 | len); | |
4603 | if (ret) | |
4604 | return ret; | |
3529d8c2 | 4605 | |
ec65fea5 | 4606 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4607 | } |
4608 | ||
45d189c6 | 4609 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4610 | { |
4611 | struct open_flags op; | |
15b71abe | 4612 | struct file *file; |
b9445598 PB |
4613 | bool resolve_nonblock, nonblock_set; |
4614 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4615 | int ret; |
4616 | ||
cebdb986 | 4617 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4618 | if (ret) |
4619 | goto err; | |
3a81fd02 JA |
4620 | nonblock_set = op.open_flag & O_NONBLOCK; |
4621 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4622 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4623 | /* |
4624 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4625 | * it'll always -EAGAIN | |
4626 | */ | |
4627 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4628 | return -EAGAIN; | |
4629 | op.lookup_flags |= LOOKUP_CACHED; | |
4630 | op.open_flag |= O_NONBLOCK; | |
4631 | } | |
15b71abe | 4632 | |
b9445598 PB |
4633 | if (!fixed) { |
4634 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4635 | if (ret < 0) | |
4636 | goto err; | |
4637 | } | |
15b71abe JA |
4638 | |
4639 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4640 | if (IS_ERR(file)) { |
944d1444 | 4641 | /* |
12dcb58a PB |
4642 | * We could hang on to this 'fd' on retrying, but seems like |
4643 | * marginal gain for something that is now known to be a slower | |
4644 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4645 | */ |
b9445598 PB |
4646 | if (!fixed) |
4647 | put_unused_fd(ret); | |
3a81fd02 | 4648 | |
15b71abe | 4649 | ret = PTR_ERR(file); |
12dcb58a PB |
4650 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4651 | if (ret == -EAGAIN && | |
4652 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4653 | return -EAGAIN; | |
4654 | goto err; | |
15b71abe | 4655 | } |
12dcb58a PB |
4656 | |
4657 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4658 | file->f_flags &= ~O_NONBLOCK; | |
4659 | fsnotify_open(file); | |
b9445598 PB |
4660 | |
4661 | if (!fixed) | |
4662 | fd_install(ret, file); | |
4663 | else | |
4664 | ret = io_install_fixed_file(req, file, issue_flags, | |
4665 | req->open.file_slot - 1); | |
15b71abe JA |
4666 | err: |
4667 | putname(req->open.filename); | |
8fef80bf | 4668 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4669 | if (ret < 0) |
93d2bcd2 | 4670 | req_set_fail(req); |
0bdf3398 | 4671 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4672 | return 0; |
4673 | } | |
4674 | ||
45d189c6 | 4675 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4676 | { |
e45cff58 | 4677 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4678 | } |
4679 | ||
067524e9 JA |
4680 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4681 | const struct io_uring_sqe *sqe) | |
4682 | { | |
4683 | struct io_provide_buf *p = &req->pbuf; | |
4684 | u64 tmp; | |
4685 | ||
26578cda PB |
4686 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4687 | sqe->splice_fd_in) | |
067524e9 JA |
4688 | return -EINVAL; |
4689 | ||
4690 | tmp = READ_ONCE(sqe->fd); | |
4691 | if (!tmp || tmp > USHRT_MAX) | |
4692 | return -EINVAL; | |
4693 | ||
4694 | memset(p, 0, sizeof(*p)); | |
4695 | p->nbufs = tmp; | |
4696 | p->bgid = READ_ONCE(sqe->buf_group); | |
4697 | return 0; | |
4698 | } | |
4699 | ||
dbc7d452 JA |
4700 | static int __io_remove_buffers(struct io_ring_ctx *ctx, |
4701 | struct io_buffer_list *bl, unsigned nbufs) | |
067524e9 JA |
4702 | { |
4703 | unsigned i = 0; | |
4704 | ||
4705 | /* shouldn't happen */ | |
4706 | if (!nbufs) | |
4707 | return 0; | |
4708 | ||
4709 | /* the head kbuf is the list itself */ | |
dbc7d452 | 4710 | while (!list_empty(&bl->buf_list)) { |
067524e9 JA |
4711 | struct io_buffer *nxt; |
4712 | ||
dbc7d452 | 4713 | nxt = list_first_entry(&bl->buf_list, struct io_buffer, list); |
067524e9 | 4714 | list_del(&nxt->list); |
067524e9 JA |
4715 | if (++i == nbufs) |
4716 | return i; | |
1d0254e6 | 4717 | cond_resched(); |
067524e9 JA |
4718 | } |
4719 | i++; | |
067524e9 JA |
4720 | |
4721 | return i; | |
4722 | } | |
4723 | ||
889fca73 | 4724 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4725 | { |
4726 | struct io_provide_buf *p = &req->pbuf; | |
4727 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 4728 | struct io_buffer_list *bl; |
067524e9 | 4729 | int ret = 0; |
3b44b371 | 4730 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
067524e9 | 4731 | |
3b44b371 | 4732 | io_ring_submit_lock(ctx, needs_lock); |
067524e9 JA |
4733 | |
4734 | lockdep_assert_held(&ctx->uring_lock); | |
4735 | ||
4736 | ret = -ENOENT; | |
dbc7d452 JA |
4737 | bl = io_buffer_get_list(ctx, p->bgid); |
4738 | if (bl) | |
4739 | ret = __io_remove_buffers(ctx, bl, p->nbufs); | |
067524e9 | 4740 | if (ret < 0) |
93d2bcd2 | 4741 | req_set_fail(req); |
067524e9 | 4742 | |
9fb8cb49 PB |
4743 | /* complete before unlock, IOPOLL may need the lock */ |
4744 | __io_req_complete(req, issue_flags, ret, 0); | |
3b44b371 | 4745 | io_ring_submit_unlock(ctx, needs_lock); |
067524e9 JA |
4746 | return 0; |
4747 | } | |
4748 | ||
ddf0322d JA |
4749 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4750 | const struct io_uring_sqe *sqe) | |
4751 | { | |
38134ada | 4752 | unsigned long size, tmp_check; |
ddf0322d JA |
4753 | struct io_provide_buf *p = &req->pbuf; |
4754 | u64 tmp; | |
4755 | ||
26578cda | 4756 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4757 | return -EINVAL; |
4758 | ||
4759 | tmp = READ_ONCE(sqe->fd); | |
4760 | if (!tmp || tmp > USHRT_MAX) | |
4761 | return -E2BIG; | |
4762 | p->nbufs = tmp; | |
4763 | p->addr = READ_ONCE(sqe->addr); | |
4764 | p->len = READ_ONCE(sqe->len); | |
4765 | ||
38134ada PB |
4766 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4767 | &size)) | |
4768 | return -EOVERFLOW; | |
4769 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4770 | return -EOVERFLOW; | |
4771 | ||
d81269fe PB |
4772 | size = (unsigned long)p->len * p->nbufs; |
4773 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4774 | return -EFAULT; |
4775 | ||
4776 | p->bgid = READ_ONCE(sqe->buf_group); | |
4777 | tmp = READ_ONCE(sqe->off); | |
4778 | if (tmp > USHRT_MAX) | |
4779 | return -E2BIG; | |
4780 | p->bid = tmp; | |
4781 | return 0; | |
4782 | } | |
4783 | ||
cc3cec83 JA |
4784 | static int io_refill_buffer_cache(struct io_ring_ctx *ctx) |
4785 | { | |
4786 | struct io_buffer *buf; | |
4787 | struct page *page; | |
4788 | int bufs_in_page; | |
4789 | ||
4790 | /* | |
4791 | * Completions that don't happen inline (eg not under uring_lock) will | |
4792 | * add to ->io_buffers_comp. If we don't have any free buffers, check | |
4793 | * the completion list and splice those entries first. | |
4794 | */ | |
4795 | if (!list_empty_careful(&ctx->io_buffers_comp)) { | |
4796 | spin_lock(&ctx->completion_lock); | |
4797 | if (!list_empty(&ctx->io_buffers_comp)) { | |
4798 | list_splice_init(&ctx->io_buffers_comp, | |
4799 | &ctx->io_buffers_cache); | |
4800 | spin_unlock(&ctx->completion_lock); | |
4801 | return 0; | |
4802 | } | |
4803 | spin_unlock(&ctx->completion_lock); | |
4804 | } | |
4805 | ||
4806 | /* | |
4807 | * No free buffers and no completion entries either. Allocate a new | |
4808 | * page worth of buffer entries and add those to our freelist. | |
4809 | */ | |
4810 | page = alloc_page(GFP_KERNEL_ACCOUNT); | |
4811 | if (!page) | |
4812 | return -ENOMEM; | |
4813 | ||
4814 | list_add(&page->lru, &ctx->io_buffers_pages); | |
4815 | ||
4816 | buf = page_address(page); | |
4817 | bufs_in_page = PAGE_SIZE / sizeof(*buf); | |
4818 | while (bufs_in_page) { | |
4819 | list_add_tail(&buf->list, &ctx->io_buffers_cache); | |
4820 | buf++; | |
4821 | bufs_in_page--; | |
4822 | } | |
4823 | ||
4824 | return 0; | |
4825 | } | |
4826 | ||
4827 | static int io_add_buffers(struct io_ring_ctx *ctx, struct io_provide_buf *pbuf, | |
dbc7d452 | 4828 | struct io_buffer_list *bl) |
ddf0322d JA |
4829 | { |
4830 | struct io_buffer *buf; | |
4831 | u64 addr = pbuf->addr; | |
4832 | int i, bid = pbuf->bid; | |
4833 | ||
4834 | for (i = 0; i < pbuf->nbufs; i++) { | |
cc3cec83 JA |
4835 | if (list_empty(&ctx->io_buffers_cache) && |
4836 | io_refill_buffer_cache(ctx)) | |
ddf0322d | 4837 | break; |
cc3cec83 JA |
4838 | buf = list_first_entry(&ctx->io_buffers_cache, struct io_buffer, |
4839 | list); | |
dbc7d452 | 4840 | list_move_tail(&buf->list, &bl->buf_list); |
ddf0322d | 4841 | buf->addr = addr; |
d1f82808 | 4842 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d | 4843 | buf->bid = bid; |
b1c62645 | 4844 | buf->bgid = pbuf->bgid; |
ddf0322d JA |
4845 | addr += pbuf->len; |
4846 | bid++; | |
f240762f | 4847 | cond_resched(); |
ddf0322d JA |
4848 | } |
4849 | ||
dbc7d452 | 4850 | return i ? 0 : -ENOMEM; |
ddf0322d JA |
4851 | } |
4852 | ||
889fca73 | 4853 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4854 | { |
4855 | struct io_provide_buf *p = &req->pbuf; | |
4856 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 4857 | struct io_buffer_list *bl; |
ddf0322d | 4858 | int ret = 0; |
3b44b371 | 4859 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
ddf0322d | 4860 | |
3b44b371 | 4861 | io_ring_submit_lock(ctx, needs_lock); |
ddf0322d JA |
4862 | |
4863 | lockdep_assert_held(&ctx->uring_lock); | |
4864 | ||
dbc7d452 JA |
4865 | bl = io_buffer_get_list(ctx, p->bgid); |
4866 | if (unlikely(!bl)) { | |
4867 | bl = kmalloc(sizeof(*bl), GFP_KERNEL); | |
4868 | if (!bl) { | |
4869 | ret = -ENOMEM; | |
4870 | goto err; | |
4871 | } | |
4872 | io_buffer_add_list(ctx, bl, p->bgid); | |
ddf0322d | 4873 | } |
dbc7d452 JA |
4874 | |
4875 | ret = io_add_buffers(ctx, p, bl); | |
4876 | err: | |
ddf0322d | 4877 | if (ret < 0) |
93d2bcd2 | 4878 | req_set_fail(req); |
9fb8cb49 PB |
4879 | /* complete before unlock, IOPOLL may need the lock */ |
4880 | __io_req_complete(req, issue_flags, ret, 0); | |
3b44b371 | 4881 | io_ring_submit_unlock(ctx, needs_lock); |
ddf0322d | 4882 | return 0; |
cebdb986 JA |
4883 | } |
4884 | ||
3e4827b0 JA |
4885 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4886 | const struct io_uring_sqe *sqe) | |
4887 | { | |
4888 | #if defined(CONFIG_EPOLL) | |
26578cda | 4889 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4890 | return -EINVAL; |
2d74d042 | 4891 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4892 | return -EINVAL; |
3e4827b0 JA |
4893 | |
4894 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4895 | req->epoll.op = READ_ONCE(sqe->len); | |
4896 | req->epoll.fd = READ_ONCE(sqe->off); | |
4897 | ||
4898 | if (ep_op_has_event(req->epoll.op)) { | |
4899 | struct epoll_event __user *ev; | |
4900 | ||
4901 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4902 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4903 | return -EFAULT; | |
4904 | } | |
4905 | ||
4906 | return 0; | |
4907 | #else | |
4908 | return -EOPNOTSUPP; | |
4909 | #endif | |
4910 | } | |
4911 | ||
889fca73 | 4912 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4913 | { |
4914 | #if defined(CONFIG_EPOLL) | |
4915 | struct io_epoll *ie = &req->epoll; | |
4916 | int ret; | |
45d189c6 | 4917 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4918 | |
4919 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4920 | if (force_nonblock && ret == -EAGAIN) | |
4921 | return -EAGAIN; | |
4922 | ||
4923 | if (ret < 0) | |
93d2bcd2 | 4924 | req_set_fail(req); |
889fca73 | 4925 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4926 | return 0; |
4927 | #else | |
4928 | return -EOPNOTSUPP; | |
4929 | #endif | |
4930 | } | |
4931 | ||
c1ca757b JA |
4932 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4933 | { | |
4934 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4935 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4936 | return -EINVAL; |
3232dd02 PB |
4937 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4938 | return -EINVAL; | |
c1ca757b JA |
4939 | |
4940 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4941 | req->madvise.len = READ_ONCE(sqe->len); | |
4942 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4943 | return 0; | |
4944 | #else | |
4945 | return -EOPNOTSUPP; | |
4946 | #endif | |
4947 | } | |
4948 | ||
45d189c6 | 4949 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4950 | { |
4951 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4952 | struct io_madvise *ma = &req->madvise; | |
4953 | int ret; | |
4954 | ||
45d189c6 | 4955 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4956 | return -EAGAIN; |
4957 | ||
0726b01e | 4958 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4959 | if (ret < 0) |
93d2bcd2 | 4960 | req_set_fail(req); |
e1e16097 | 4961 | io_req_complete(req, ret); |
c1ca757b JA |
4962 | return 0; |
4963 | #else | |
4964 | return -EOPNOTSUPP; | |
4965 | #endif | |
4966 | } | |
4967 | ||
4840e418 JA |
4968 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4969 | { | |
26578cda | 4970 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4971 | return -EINVAL; |
3232dd02 PB |
4972 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4973 | return -EINVAL; | |
4840e418 JA |
4974 | |
4975 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4976 | req->fadvise.len = READ_ONCE(sqe->len); | |
4977 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4978 | return 0; | |
4979 | } | |
4980 | ||
45d189c6 | 4981 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4982 | { |
4983 | struct io_fadvise *fa = &req->fadvise; | |
4984 | int ret; | |
4985 | ||
45d189c6 | 4986 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4987 | switch (fa->advice) { |
4988 | case POSIX_FADV_NORMAL: | |
4989 | case POSIX_FADV_RANDOM: | |
4990 | case POSIX_FADV_SEQUENTIAL: | |
4991 | break; | |
4992 | default: | |
4993 | return -EAGAIN; | |
4994 | } | |
4995 | } | |
4840e418 JA |
4996 | |
4997 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4998 | if (ret < 0) | |
93d2bcd2 | 4999 | req_set_fail(req); |
0bdf3398 | 5000 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
5001 | return 0; |
5002 | } | |
5003 | ||
eddc7ef5 JA |
5004 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5005 | { | |
1b6fe6e0 SR |
5006 | const char __user *path; |
5007 | ||
2d74d042 | 5008 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 5009 | return -EINVAL; |
26578cda | 5010 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 5011 | return -EINVAL; |
9c280f90 | 5012 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5013 | return -EBADF; |
eddc7ef5 | 5014 | |
1d9e1288 BM |
5015 | req->statx.dfd = READ_ONCE(sqe->fd); |
5016 | req->statx.mask = READ_ONCE(sqe->len); | |
1b6fe6e0 | 5017 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
5018 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
5019 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 | 5020 | |
1b6fe6e0 SR |
5021 | req->statx.filename = getname_flags(path, |
5022 | getname_statx_lookup_flags(req->statx.flags), | |
5023 | NULL); | |
5024 | ||
5025 | if (IS_ERR(req->statx.filename)) { | |
5026 | int ret = PTR_ERR(req->statx.filename); | |
5027 | ||
5028 | req->statx.filename = NULL; | |
5029 | return ret; | |
5030 | } | |
5031 | ||
5032 | req->flags |= REQ_F_NEED_CLEANUP; | |
eddc7ef5 JA |
5033 | return 0; |
5034 | } | |
5035 | ||
45d189c6 | 5036 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 5037 | { |
1d9e1288 | 5038 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
5039 | int ret; |
5040 | ||
59d70013 | 5041 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
5042 | return -EAGAIN; |
5043 | ||
e62753e4 BM |
5044 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
5045 | ctx->buffer); | |
eddc7ef5 | 5046 | |
eddc7ef5 | 5047 | if (ret < 0) |
93d2bcd2 | 5048 | req_set_fail(req); |
e1e16097 | 5049 | io_req_complete(req, ret); |
eddc7ef5 JA |
5050 | return 0; |
5051 | } | |
5052 | ||
b5dba59e JA |
5053 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5054 | { | |
14587a46 | 5055 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 5056 | return -EINVAL; |
b5dba59e | 5057 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 5058 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 5059 | return -EINVAL; |
9c280f90 | 5060 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5061 | return -EBADF; |
b5dba59e JA |
5062 | |
5063 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
5064 | req->close.file_slot = READ_ONCE(sqe->file_index); |
5065 | if (req->close.file_slot && req->close.fd) | |
5066 | return -EINVAL; | |
5067 | ||
b5dba59e | 5068 | return 0; |
b5dba59e JA |
5069 | } |
5070 | ||
889fca73 | 5071 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 5072 | { |
9eac1904 | 5073 | struct files_struct *files = current->files; |
3af73b28 | 5074 | struct io_close *close = &req->close; |
9eac1904 | 5075 | struct fdtable *fdt; |
a1fde923 PB |
5076 | struct file *file = NULL; |
5077 | int ret = -EBADF; | |
b5dba59e | 5078 | |
7df778be PB |
5079 | if (req->close.file_slot) { |
5080 | ret = io_close_fixed(req, issue_flags); | |
5081 | goto err; | |
5082 | } | |
5083 | ||
9eac1904 JA |
5084 | spin_lock(&files->file_lock); |
5085 | fdt = files_fdtable(files); | |
5086 | if (close->fd >= fdt->max_fds) { | |
5087 | spin_unlock(&files->file_lock); | |
5088 | goto err; | |
5089 | } | |
5090 | file = fdt->fd[close->fd]; | |
a1fde923 | 5091 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
5092 | spin_unlock(&files->file_lock); |
5093 | file = NULL; | |
5094 | goto err; | |
3af73b28 | 5095 | } |
b5dba59e JA |
5096 | |
5097 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 5098 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 5099 | spin_unlock(&files->file_lock); |
0bf0eefd | 5100 | return -EAGAIN; |
a2100672 | 5101 | } |
b5dba59e | 5102 | |
9eac1904 JA |
5103 | ret = __close_fd_get_file(close->fd, &file); |
5104 | spin_unlock(&files->file_lock); | |
5105 | if (ret < 0) { | |
5106 | if (ret == -ENOENT) | |
5107 | ret = -EBADF; | |
5108 | goto err; | |
5109 | } | |
5110 | ||
3af73b28 | 5111 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
5112 | ret = filp_close(file, current->files); |
5113 | err: | |
3af73b28 | 5114 | if (ret < 0) |
93d2bcd2 | 5115 | req_set_fail(req); |
9eac1904 JA |
5116 | if (file) |
5117 | fput(file); | |
889fca73 | 5118 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 5119 | return 0; |
b5dba59e JA |
5120 | } |
5121 | ||
1155c76a | 5122 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
5123 | { |
5124 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 5125 | |
5d17b4a4 JA |
5126 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
5127 | return -EINVAL; | |
26578cda PB |
5128 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
5129 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
5130 | return -EINVAL; |
5131 | ||
8ed8d3c3 JA |
5132 | req->sync.off = READ_ONCE(sqe->off); |
5133 | req->sync.len = READ_ONCE(sqe->len); | |
5134 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
5135 | return 0; |
5136 | } | |
5137 | ||
45d189c6 | 5138 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 5139 | { |
8ed8d3c3 JA |
5140 | int ret; |
5141 | ||
ac45abc0 | 5142 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 5143 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
5144 | return -EAGAIN; |
5145 | ||
9adbd45d | 5146 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
5147 | req->sync.flags); |
5148 | if (ret < 0) | |
93d2bcd2 | 5149 | req_set_fail(req); |
e1e16097 | 5150 | io_req_complete(req, ret); |
5d17b4a4 JA |
5151 | return 0; |
5152 | } | |
5153 | ||
469956e8 | 5154 | #if defined(CONFIG_NET) |
02d27d89 PB |
5155 | static int io_setup_async_msg(struct io_kiocb *req, |
5156 | struct io_async_msghdr *kmsg) | |
5157 | { | |
e8c2bc1f JA |
5158 | struct io_async_msghdr *async_msg = req->async_data; |
5159 | ||
5160 | if (async_msg) | |
02d27d89 | 5161 | return -EAGAIN; |
e8c2bc1f | 5162 | if (io_alloc_async_data(req)) { |
257e84a5 | 5163 | kfree(kmsg->free_iov); |
02d27d89 PB |
5164 | return -ENOMEM; |
5165 | } | |
e8c2bc1f | 5166 | async_msg = req->async_data; |
02d27d89 | 5167 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 5168 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 5169 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
5170 | /* if were using fast_iov, set it to the new one */ |
5171 | if (!async_msg->free_iov) | |
5172 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
5173 | ||
02d27d89 PB |
5174 | return -EAGAIN; |
5175 | } | |
5176 | ||
2ae523ed PB |
5177 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
5178 | struct io_async_msghdr *iomsg) | |
5179 | { | |
2ae523ed | 5180 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 5181 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 5182 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 5183 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
5184 | } |
5185 | ||
93642ef8 PB |
5186 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
5187 | { | |
5188 | int ret; | |
5189 | ||
93642ef8 PB |
5190 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
5191 | if (!ret) | |
5192 | req->flags |= REQ_F_NEED_CLEANUP; | |
5193 | return ret; | |
5194 | } | |
5195 | ||
3529d8c2 | 5196 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 5197 | { |
e47293fd | 5198 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 5199 | |
d2b6f48b PB |
5200 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5201 | return -EINVAL; | |
5202 | ||
270a5940 | 5203 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 5204 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
5205 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5206 | if (sr->msg_flags & MSG_DONTWAIT) | |
5207 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 5208 | |
d8768362 JA |
5209 | #ifdef CONFIG_COMPAT |
5210 | if (req->ctx->compat) | |
5211 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5212 | #endif | |
93642ef8 | 5213 | return 0; |
03b1230c JA |
5214 | } |
5215 | ||
889fca73 | 5216 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5217 | { |
6b754c8b | 5218 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 5219 | struct socket *sock; |
7a7cacba | 5220 | unsigned flags; |
0031275d | 5221 | int min_ret = 0; |
0fa03c62 JA |
5222 | int ret; |
5223 | ||
dba4a925 | 5224 | sock = sock_from_file(req->file); |
7a7cacba | 5225 | if (unlikely(!sock)) |
dba4a925 | 5226 | return -ENOTSOCK; |
3529d8c2 | 5227 | |
d886e185 PB |
5228 | if (req_has_async_data(req)) { |
5229 | kmsg = req->async_data; | |
5230 | } else { | |
7a7cacba PB |
5231 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
5232 | if (ret) | |
5233 | return ret; | |
5234 | kmsg = &iomsg; | |
0fa03c62 | 5235 | } |
0fa03c62 | 5236 | |
04411806 PB |
5237 | flags = req->sr_msg.msg_flags; |
5238 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 5239 | flags |= MSG_DONTWAIT; |
0031275d SM |
5240 | if (flags & MSG_WAITALL) |
5241 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5242 | ||
7a7cacba | 5243 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
0fa03c62 | 5244 | |
7297ce3d PB |
5245 | if (ret < min_ret) { |
5246 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
5247 | return io_setup_async_msg(req, kmsg); | |
5248 | if (ret == -ERESTARTSYS) | |
5249 | ret = -EINTR; | |
5250 | req_set_fail(req); | |
5251 | } | |
257e84a5 PB |
5252 | /* fast path, check for non-NULL to avoid function call */ |
5253 | if (kmsg->free_iov) | |
5254 | kfree(kmsg->free_iov); | |
99bc4c38 | 5255 | req->flags &= ~REQ_F_NEED_CLEANUP; |
889fca73 | 5256 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 5257 | return 0; |
03b1230c | 5258 | } |
aa1fa28f | 5259 | |
889fca73 | 5260 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5261 | { |
7a7cacba PB |
5262 | struct io_sr_msg *sr = &req->sr_msg; |
5263 | struct msghdr msg; | |
5264 | struct iovec iov; | |
fddaface | 5265 | struct socket *sock; |
7a7cacba | 5266 | unsigned flags; |
0031275d | 5267 | int min_ret = 0; |
fddaface JA |
5268 | int ret; |
5269 | ||
dba4a925 | 5270 | sock = sock_from_file(req->file); |
7a7cacba | 5271 | if (unlikely(!sock)) |
dba4a925 | 5272 | return -ENOTSOCK; |
fddaface | 5273 | |
7a7cacba PB |
5274 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
5275 | if (unlikely(ret)) | |
14db8411 | 5276 | return ret; |
fddaface | 5277 | |
7a7cacba PB |
5278 | msg.msg_name = NULL; |
5279 | msg.msg_control = NULL; | |
5280 | msg.msg_controllen = 0; | |
5281 | msg.msg_namelen = 0; | |
fddaface | 5282 | |
04411806 PB |
5283 | flags = req->sr_msg.msg_flags; |
5284 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 5285 | flags |= MSG_DONTWAIT; |
0031275d SM |
5286 | if (flags & MSG_WAITALL) |
5287 | min_ret = iov_iter_count(&msg.msg_iter); | |
5288 | ||
7a7cacba PB |
5289 | msg.msg_flags = flags; |
5290 | ret = sock_sendmsg(sock, &msg); | |
7297ce3d PB |
5291 | if (ret < min_ret) { |
5292 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
5293 | return -EAGAIN; | |
5294 | if (ret == -ERESTARTSYS) | |
5295 | ret = -EINTR; | |
93d2bcd2 | 5296 | req_set_fail(req); |
7297ce3d | 5297 | } |
889fca73 | 5298 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 5299 | return 0; |
fddaface JA |
5300 | } |
5301 | ||
1400e697 PB |
5302 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
5303 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
5304 | { |
5305 | struct io_sr_msg *sr = &req->sr_msg; | |
5306 | struct iovec __user *uiov; | |
5307 | size_t iov_len; | |
5308 | int ret; | |
5309 | ||
1400e697 PB |
5310 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
5311 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
5312 | if (ret) |
5313 | return ret; | |
5314 | ||
5315 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
5316 | if (iov_len > 1) | |
5317 | return -EINVAL; | |
5476dfed | 5318 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 5319 | return -EFAULT; |
5476dfed | 5320 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 5321 | iomsg->free_iov = NULL; |
52de1fe1 | 5322 | } else { |
257e84a5 | 5323 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 5324 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 5325 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 5326 | false); |
52de1fe1 JA |
5327 | if (ret > 0) |
5328 | ret = 0; | |
5329 | } | |
5330 | ||
5331 | return ret; | |
5332 | } | |
5333 | ||
5334 | #ifdef CONFIG_COMPAT | |
5335 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 5336 | struct io_async_msghdr *iomsg) |
52de1fe1 | 5337 | { |
52de1fe1 JA |
5338 | struct io_sr_msg *sr = &req->sr_msg; |
5339 | struct compat_iovec __user *uiov; | |
5340 | compat_uptr_t ptr; | |
5341 | compat_size_t len; | |
5342 | int ret; | |
5343 | ||
4af3417a PB |
5344 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
5345 | &ptr, &len); | |
52de1fe1 JA |
5346 | if (ret) |
5347 | return ret; | |
5348 | ||
5349 | uiov = compat_ptr(ptr); | |
5350 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
5351 | compat_ssize_t clen; | |
5352 | ||
5353 | if (len > 1) | |
5354 | return -EINVAL; | |
5355 | if (!access_ok(uiov, sizeof(*uiov))) | |
5356 | return -EFAULT; | |
5357 | if (__get_user(clen, &uiov->iov_len)) | |
5358 | return -EFAULT; | |
5359 | if (clen < 0) | |
5360 | return -EINVAL; | |
2d280bc8 | 5361 | sr->len = clen; |
257e84a5 | 5362 | iomsg->free_iov = NULL; |
52de1fe1 | 5363 | } else { |
257e84a5 | 5364 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 5365 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 5366 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 5367 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
5368 | if (ret < 0) |
5369 | return ret; | |
5370 | } | |
5371 | ||
5372 | return 0; | |
5373 | } | |
5374 | #endif | |
5375 | ||
1400e697 PB |
5376 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
5377 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 5378 | { |
1400e697 | 5379 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
5380 | |
5381 | #ifdef CONFIG_COMPAT | |
5382 | if (req->ctx->compat) | |
1400e697 | 5383 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 5384 | #endif |
52de1fe1 | 5385 | |
1400e697 | 5386 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
5387 | } |
5388 | ||
bcda7baa | 5389 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
51aac424 | 5390 | unsigned int issue_flags) |
bcda7baa JA |
5391 | { |
5392 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 5393 | |
51aac424 | 5394 | return io_buffer_select(req, &sr->len, sr->bgid, issue_flags); |
fddaface JA |
5395 | } |
5396 | ||
93642ef8 | 5397 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 5398 | { |
99bc4c38 | 5399 | int ret; |
3529d8c2 | 5400 | |
93642ef8 PB |
5401 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
5402 | if (!ret) | |
5403 | req->flags |= REQ_F_NEED_CLEANUP; | |
5404 | return ret; | |
5405 | } | |
5406 | ||
5407 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5408 | { | |
5409 | struct io_sr_msg *sr = &req->sr_msg; | |
5410 | ||
d2b6f48b PB |
5411 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5412 | return -EINVAL; | |
5413 | ||
270a5940 | 5414 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 5415 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 5416 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
5417 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5418 | if (sr->msg_flags & MSG_DONTWAIT) | |
5419 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 5420 | |
d8768362 JA |
5421 | #ifdef CONFIG_COMPAT |
5422 | if (req->ctx->compat) | |
5423 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5424 | #endif | |
7ba89d2a | 5425 | sr->done_io = 0; |
93642ef8 | 5426 | return 0; |
aa1fa28f JA |
5427 | } |
5428 | ||
7ba89d2a JA |
5429 | static bool io_net_retry(struct socket *sock, int flags) |
5430 | { | |
5431 | if (!(flags & MSG_WAITALL)) | |
5432 | return false; | |
5433 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
5434 | } | |
5435 | ||
889fca73 | 5436 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5437 | { |
6b754c8b | 5438 | struct io_async_msghdr iomsg, *kmsg; |
7ba89d2a | 5439 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 5440 | struct socket *sock; |
7fbb1b54 | 5441 | struct io_buffer *kbuf; |
7a7cacba | 5442 | unsigned flags; |
d1fd1c20 | 5443 | int ret, min_ret = 0; |
45d189c6 | 5444 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 5445 | |
dba4a925 | 5446 | sock = sock_from_file(req->file); |
7a7cacba | 5447 | if (unlikely(!sock)) |
dba4a925 | 5448 | return -ENOTSOCK; |
3529d8c2 | 5449 | |
d886e185 PB |
5450 | if (req_has_async_data(req)) { |
5451 | kmsg = req->async_data; | |
5452 | } else { | |
7a7cacba PB |
5453 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
5454 | if (ret) | |
681fda8d | 5455 | return ret; |
7a7cacba PB |
5456 | kmsg = &iomsg; |
5457 | } | |
03b1230c | 5458 | |
bc02ef33 | 5459 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5460 | kbuf = io_recv_buffer_select(req, issue_flags); |
bc02ef33 | 5461 | if (IS_ERR(kbuf)) |
52de1fe1 | 5462 | return PTR_ERR(kbuf); |
7a7cacba | 5463 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
5464 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
5465 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
5466 | 1, req->sr_msg.len); |
5467 | } | |
52de1fe1 | 5468 | |
04411806 PB |
5469 | flags = req->sr_msg.msg_flags; |
5470 | if (force_nonblock) | |
7a7cacba | 5471 | flags |= MSG_DONTWAIT; |
0031275d SM |
5472 | if (flags & MSG_WAITALL) |
5473 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5474 | ||
7a7cacba PB |
5475 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
5476 | kmsg->uaddr, flags); | |
7297ce3d PB |
5477 | if (ret < min_ret) { |
5478 | if (ret == -EAGAIN && force_nonblock) | |
5479 | return io_setup_async_msg(req, kmsg); | |
5480 | if (ret == -ERESTARTSYS) | |
5481 | ret = -EINTR; | |
7ba89d2a JA |
5482 | if (ret > 0 && io_net_retry(sock, flags)) { |
5483 | sr->done_io += ret; | |
8a3e8ee5 | 5484 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
5485 | return io_setup_async_msg(req, kmsg); |
5486 | } | |
7297ce3d PB |
5487 | req_set_fail(req); |
5488 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
5489 | req_set_fail(req); | |
5490 | } | |
03b1230c | 5491 | |
257e84a5 PB |
5492 | /* fast path, check for non-NULL to avoid function call */ |
5493 | if (kmsg->free_iov) | |
5494 | kfree(kmsg->free_iov); | |
99bc4c38 | 5495 | req->flags &= ~REQ_F_NEED_CLEANUP; |
7ba89d2a JA |
5496 | if (ret >= 0) |
5497 | ret += sr->done_io; | |
5498 | else if (sr->done_io) | |
5499 | ret = sr->done_io; | |
cc3cec83 | 5500 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req, issue_flags)); |
03b1230c | 5501 | return 0; |
0fa03c62 | 5502 | } |
5d17b4a4 | 5503 | |
889fca73 | 5504 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5505 | { |
6b754c8b | 5506 | struct io_buffer *kbuf; |
7a7cacba PB |
5507 | struct io_sr_msg *sr = &req->sr_msg; |
5508 | struct msghdr msg; | |
5509 | void __user *buf = sr->buf; | |
fddaface | 5510 | struct socket *sock; |
7a7cacba PB |
5511 | struct iovec iov; |
5512 | unsigned flags; | |
d1fd1c20 | 5513 | int ret, min_ret = 0; |
45d189c6 | 5514 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5515 | |
dba4a925 | 5516 | sock = sock_from_file(req->file); |
7a7cacba | 5517 | if (unlikely(!sock)) |
dba4a925 | 5518 | return -ENOTSOCK; |
fddaface | 5519 | |
bc02ef33 | 5520 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5521 | kbuf = io_recv_buffer_select(req, issue_flags); |
bcda7baa JA |
5522 | if (IS_ERR(kbuf)) |
5523 | return PTR_ERR(kbuf); | |
7a7cacba | 5524 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5525 | } |
bcda7baa | 5526 | |
7a7cacba | 5527 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5528 | if (unlikely(ret)) |
5529 | goto out_free; | |
fddaface | 5530 | |
7a7cacba PB |
5531 | msg.msg_name = NULL; |
5532 | msg.msg_control = NULL; | |
5533 | msg.msg_controllen = 0; | |
5534 | msg.msg_namelen = 0; | |
5535 | msg.msg_iocb = NULL; | |
5536 | msg.msg_flags = 0; | |
fddaface | 5537 | |
04411806 PB |
5538 | flags = req->sr_msg.msg_flags; |
5539 | if (force_nonblock) | |
7a7cacba | 5540 | flags |= MSG_DONTWAIT; |
0031275d SM |
5541 | if (flags & MSG_WAITALL) |
5542 | min_ret = iov_iter_count(&msg.msg_iter); | |
5543 | ||
7a7cacba | 5544 | ret = sock_recvmsg(sock, &msg, flags); |
7297ce3d PB |
5545 | if (ret < min_ret) { |
5546 | if (ret == -EAGAIN && force_nonblock) | |
5547 | return -EAGAIN; | |
5548 | if (ret == -ERESTARTSYS) | |
5549 | ret = -EINTR; | |
7ba89d2a JA |
5550 | if (ret > 0 && io_net_retry(sock, flags)) { |
5551 | sr->len -= ret; | |
5552 | sr->buf += ret; | |
5553 | sr->done_io += ret; | |
8a3e8ee5 | 5554 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
5555 | return -EAGAIN; |
5556 | } | |
7297ce3d PB |
5557 | req_set_fail(req); |
5558 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
0d7c1153 | 5559 | out_free: |
93d2bcd2 | 5560 | req_set_fail(req); |
7297ce3d | 5561 | } |
cc3cec83 | 5562 | |
7ba89d2a JA |
5563 | if (ret >= 0) |
5564 | ret += sr->done_io; | |
5565 | else if (sr->done_io) | |
5566 | ret = sr->done_io; | |
cc3cec83 | 5567 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req, issue_flags)); |
fddaface | 5568 | return 0; |
fddaface JA |
5569 | } |
5570 | ||
3529d8c2 | 5571 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5572 | { |
8ed8d3c3 JA |
5573 | struct io_accept *accept = &req->accept; |
5574 | ||
14587a46 | 5575 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5576 | return -EINVAL; |
aaa4db12 | 5577 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5578 | return -EINVAL; |
5579 | ||
d55e5f5b JA |
5580 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5581 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5582 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5583 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5584 | |
aaa4db12 | 5585 | accept->file_slot = READ_ONCE(sqe->file_index); |
adf3a9e9 | 5586 | if (accept->file_slot && (accept->flags & SOCK_CLOEXEC)) |
aaa4db12 | 5587 | return -EINVAL; |
a7083ad5 PB |
5588 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5589 | return -EINVAL; | |
5590 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5591 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5592 | return 0; |
8ed8d3c3 | 5593 | } |
17f2fe35 | 5594 | |
889fca73 | 5595 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5596 | { |
5597 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5598 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5599 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5600 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5601 | struct file *file; |
5602 | int ret, fd; | |
8ed8d3c3 | 5603 | |
aaa4db12 PB |
5604 | if (!fixed) { |
5605 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5606 | if (unlikely(fd < 0)) | |
5607 | return fd; | |
5608 | } | |
a7083ad5 PB |
5609 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5610 | accept->flags); | |
5611 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5612 | if (!fixed) |
5613 | put_unused_fd(fd); | |
a7083ad5 PB |
5614 | ret = PTR_ERR(file); |
5615 | if (ret == -EAGAIN && force_nonblock) | |
5616 | return -EAGAIN; | |
ac45abc0 PB |
5617 | if (ret == -ERESTARTSYS) |
5618 | ret = -EINTR; | |
93d2bcd2 | 5619 | req_set_fail(req); |
aaa4db12 | 5620 | } else if (!fixed) { |
a7083ad5 PB |
5621 | fd_install(fd, file); |
5622 | ret = fd; | |
aaa4db12 PB |
5623 | } else { |
5624 | ret = io_install_fixed_file(req, file, issue_flags, | |
5625 | accept->file_slot - 1); | |
ac45abc0 | 5626 | } |
889fca73 | 5627 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5628 | return 0; |
8ed8d3c3 JA |
5629 | } |
5630 | ||
93642ef8 PB |
5631 | static int io_connect_prep_async(struct io_kiocb *req) |
5632 | { | |
5633 | struct io_async_connect *io = req->async_data; | |
5634 | struct io_connect *conn = &req->connect; | |
5635 | ||
5636 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5637 | } | |
5638 | ||
3529d8c2 | 5639 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5640 | { |
3529d8c2 | 5641 | struct io_connect *conn = &req->connect; |
f499a021 | 5642 | |
14587a46 | 5643 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5644 | return -EINVAL; |
26578cda PB |
5645 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5646 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5647 | return -EINVAL; |
5648 | ||
3529d8c2 JA |
5649 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5650 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5651 | return 0; |
f499a021 JA |
5652 | } |
5653 | ||
889fca73 | 5654 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5655 | { |
e8c2bc1f | 5656 | struct io_async_connect __io, *io; |
f8e85cf2 | 5657 | unsigned file_flags; |
3fbb51c1 | 5658 | int ret; |
45d189c6 | 5659 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5660 | |
d886e185 | 5661 | if (req_has_async_data(req)) { |
e8c2bc1f | 5662 | io = req->async_data; |
f499a021 | 5663 | } else { |
3529d8c2 JA |
5664 | ret = move_addr_to_kernel(req->connect.addr, |
5665 | req->connect.addr_len, | |
e8c2bc1f | 5666 | &__io.address); |
f499a021 JA |
5667 | if (ret) |
5668 | goto out; | |
5669 | io = &__io; | |
5670 | } | |
5671 | ||
3fbb51c1 JA |
5672 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5673 | ||
e8c2bc1f | 5674 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5675 | req->connect.addr_len, file_flags); |
87f80d62 | 5676 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 5677 | if (req_has_async_data(req)) |
b7bb4f7d | 5678 | return -EAGAIN; |
e8c2bc1f | 5679 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5680 | ret = -ENOMEM; |
5681 | goto out; | |
5682 | } | |
e8c2bc1f | 5683 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5684 | return -EAGAIN; |
f499a021 | 5685 | } |
f8e85cf2 JA |
5686 | if (ret == -ERESTARTSYS) |
5687 | ret = -EINTR; | |
f499a021 | 5688 | out: |
4e88d6e7 | 5689 | if (ret < 0) |
93d2bcd2 | 5690 | req_set_fail(req); |
889fca73 | 5691 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5692 | return 0; |
469956e8 Y |
5693 | } |
5694 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5695 | #define IO_NETOP_FN(op) \ |
5696 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5697 | { \ | |
5698 | return -EOPNOTSUPP; \ | |
5699 | } | |
5700 | ||
5701 | #define IO_NETOP_PREP(op) \ | |
5702 | IO_NETOP_FN(op) \ | |
5703 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5704 | { \ | |
5705 | return -EOPNOTSUPP; \ | |
5706 | } \ | |
5707 | ||
5708 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5709 | IO_NETOP_PREP(op) \ | |
5710 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5711 | { \ | |
5712 | return -EOPNOTSUPP; \ | |
5713 | } | |
5714 | ||
5715 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5716 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5717 | IO_NETOP_PREP_ASYNC(connect); | |
5718 | IO_NETOP_PREP(accept); | |
5719 | IO_NETOP_FN(send); | |
5720 | IO_NETOP_FN(recv); | |
469956e8 | 5721 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5722 | |
d7718a9d JA |
5723 | struct io_poll_table { |
5724 | struct poll_table_struct pt; | |
5725 | struct io_kiocb *req; | |
68b11e8b | 5726 | int nr_entries; |
d7718a9d JA |
5727 | int error; |
5728 | }; | |
ce593a6c | 5729 | |
aa43477b | 5730 | #define IO_POLL_CANCEL_FLAG BIT(31) |
e2c0cb7c | 5731 | #define IO_POLL_REF_MASK GENMASK(30, 0) |
6d816e08 | 5732 | |
aa43477b PB |
5733 | /* |
5734 | * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can | |
5735 | * bump it and acquire ownership. It's disallowed to modify requests while not | |
5736 | * owning it, that prevents from races for enqueueing task_work's and b/w | |
5737 | * arming poll and wakeups. | |
5738 | */ | |
5739 | static inline bool io_poll_get_ownership(struct io_kiocb *req) | |
5740 | { | |
5741 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); | |
d7718a9d JA |
5742 | } |
5743 | ||
aa43477b | 5744 | static void io_poll_mark_cancelled(struct io_kiocb *req) |
74ce6ce4 | 5745 | { |
aa43477b | 5746 | atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); |
74ce6ce4 JA |
5747 | } |
5748 | ||
d4e7cd36 | 5749 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5750 | { |
e8c2bc1f | 5751 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5752 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5753 | return req->async_data; |
d4e7cd36 JA |
5754 | return req->apoll->double_poll; |
5755 | } | |
5756 | ||
5757 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5758 | { | |
5759 | if (req->opcode == IORING_OP_POLL_ADD) | |
5760 | return &req->poll; | |
5761 | return &req->apoll->poll; | |
5762 | } | |
5763 | ||
5641897a | 5764 | static void io_poll_req_insert(struct io_kiocb *req) |
d4e7cd36 | 5765 | { |
5641897a PB |
5766 | struct io_ring_ctx *ctx = req->ctx; |
5767 | struct hlist_head *list; | |
18bceab1 | 5768 | |
5641897a PB |
5769 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; |
5770 | hlist_add_head(&req->hash_node, list); | |
18bceab1 JA |
5771 | } |
5772 | ||
5641897a PB |
5773 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, |
5774 | wait_queue_func_t wake_func) | |
18bceab1 | 5775 | { |
5641897a | 5776 | poll->head = NULL; |
5641897a PB |
5777 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5778 | /* mask in events that we always want/need */ | |
5779 | poll->events = events | IO_POLL_UNMASK; | |
5780 | INIT_LIST_HEAD(&poll->wait.entry); | |
5781 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
18bceab1 JA |
5782 | } |
5783 | ||
aa43477b | 5784 | static inline void io_poll_remove_entry(struct io_poll_iocb *poll) |
18bceab1 | 5785 | { |
791f3465 | 5786 | struct wait_queue_head *head = smp_load_acquire(&poll->head); |
18bceab1 | 5787 | |
791f3465 PB |
5788 | if (head) { |
5789 | spin_lock_irq(&head->lock); | |
5790 | list_del_init(&poll->wait.entry); | |
5791 | poll->head = NULL; | |
5792 | spin_unlock_irq(&head->lock); | |
5793 | } | |
aa43477b | 5794 | } |
18bceab1 | 5795 | |
aa43477b PB |
5796 | static void io_poll_remove_entries(struct io_kiocb *req) |
5797 | { | |
91eac1c6 JA |
5798 | /* |
5799 | * Nothing to do if neither of those flags are set. Avoid dipping | |
5800 | * into the poll/apoll/double cachelines if we can. | |
5801 | */ | |
5802 | if (!(req->flags & (REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL))) | |
5803 | return; | |
18bceab1 | 5804 | |
791f3465 PB |
5805 | /* |
5806 | * While we hold the waitqueue lock and the waitqueue is nonempty, | |
5807 | * wake_up_pollfree() will wait for us. However, taking the waitqueue | |
5808 | * lock in the first place can race with the waitqueue being freed. | |
5809 | * | |
5810 | * We solve this as eventpoll does: by taking advantage of the fact that | |
5811 | * all users of wake_up_pollfree() will RCU-delay the actual free. If | |
5812 | * we enter rcu_read_lock() and see that the pointer to the queue is | |
5813 | * non-NULL, we can then lock it without the memory being freed out from | |
5814 | * under us. | |
5815 | * | |
5816 | * Keep holding rcu_read_lock() as long as we hold the queue lock, in | |
5817 | * case the caller deletes the entry from the queue, leaving it empty. | |
5818 | * In that case, only RCU prevents the queue memory from being freed. | |
5819 | */ | |
5820 | rcu_read_lock(); | |
91eac1c6 JA |
5821 | if (req->flags & REQ_F_SINGLE_POLL) |
5822 | io_poll_remove_entry(io_poll_get_single(req)); | |
5823 | if (req->flags & REQ_F_DOUBLE_POLL) | |
5824 | io_poll_remove_entry(io_poll_get_double(req)); | |
791f3465 | 5825 | rcu_read_unlock(); |
18bceab1 JA |
5826 | } |
5827 | ||
aa43477b PB |
5828 | /* |
5829 | * All poll tw should go through this. Checks for poll events, manages | |
5830 | * references, does rewait, etc. | |
5831 | * | |
5832 | * Returns a negative error on failure. >0 when no action require, which is | |
5833 | * either spurious wakeup or multishot CQE is served. 0 when it's done with | |
5834 | * the request, then the mask is stored in req->result. | |
5835 | */ | |
5106dd6e | 5836 | static int io_poll_check_events(struct io_kiocb *req, bool locked) |
18bceab1 | 5837 | { |
74ce6ce4 | 5838 | struct io_ring_ctx *ctx = req->ctx; |
d4e7cd36 | 5839 | struct io_poll_iocb *poll = io_poll_get_single(req); |
aa43477b | 5840 | int v; |
18bceab1 | 5841 | |
316319e8 | 5842 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 | 5843 | if (unlikely(req->task->flags & PF_EXITING)) |
aa43477b | 5844 | io_poll_mark_cancelled(req); |
18bceab1 | 5845 | |
aa43477b PB |
5846 | do { |
5847 | v = atomic_read(&req->poll_refs); | |
74ce6ce4 | 5848 | |
aa43477b PB |
5849 | /* tw handler should be the owner, and so have some references */ |
5850 | if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) | |
5851 | return 0; | |
5852 | if (v & IO_POLL_CANCEL_FLAG) | |
5853 | return -ECANCELED; | |
8706e04e | 5854 | |
aa43477b | 5855 | if (!req->result) { |
81459350 | 5856 | struct poll_table_struct pt = { ._key = req->cflags }; |
18bceab1 | 5857 | |
d5361233 JA |
5858 | if (unlikely(!io_assign_file(req, IO_URING_F_UNLOCKED))) |
5859 | req->result = -EBADF; | |
5860 | else | |
5861 | req->result = vfs_poll(req->file, &pt) & req->cflags; | |
c8b5e260 | 5862 | } |
74ce6ce4 | 5863 | |
aa43477b | 5864 | /* multishot, just fill an CQE and proceed */ |
81459350 | 5865 | if (req->result && !(req->cflags & EPOLLONESHOT)) { |
aa43477b PB |
5866 | __poll_t mask = mangle_poll(req->result & poll->events); |
5867 | bool filled; | |
18bceab1 | 5868 | |
aa43477b PB |
5869 | spin_lock(&ctx->completion_lock); |
5870 | filled = io_fill_cqe_aux(ctx, req->user_data, mask, | |
5871 | IORING_CQE_F_MORE); | |
5872 | io_commit_cqring(ctx); | |
5873 | spin_unlock(&ctx->completion_lock); | |
5874 | if (unlikely(!filled)) | |
5875 | return -ECANCELED; | |
5876 | io_cqring_ev_posted(ctx); | |
5877 | } else if (req->result) { | |
5878 | return 0; | |
5879 | } | |
18bceab1 | 5880 | |
aa43477b PB |
5881 | /* |
5882 | * Release all references, retry if someone tried to restart | |
5883 | * task_work while we were executing it. | |
5884 | */ | |
5885 | } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs)); | |
18bceab1 | 5886 | |
18bceab1 JA |
5887 | return 1; |
5888 | } | |
5889 | ||
aa43477b | 5890 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 | 5891 | { |
18bceab1 | 5892 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 5893 | int ret; |
18bceab1 | 5894 | |
5106dd6e | 5895 | ret = io_poll_check_events(req, *locked); |
aa43477b PB |
5896 | if (ret > 0) |
5897 | return; | |
5898 | ||
5899 | if (!ret) { | |
5900 | req->result = mangle_poll(req->result & req->poll.events); | |
e27414be | 5901 | } else { |
aa43477b PB |
5902 | req->result = ret; |
5903 | req_set_fail(req); | |
a62682f9 | 5904 | } |
aa43477b PB |
5905 | |
5906 | io_poll_remove_entries(req); | |
5907 | spin_lock(&ctx->completion_lock); | |
5908 | hash_del(&req->hash_node); | |
5909 | __io_req_complete_post(req, req->result, 0); | |
5910 | io_commit_cqring(ctx); | |
5911 | spin_unlock(&ctx->completion_lock); | |
5912 | io_cqring_ev_posted(ctx); | |
18bceab1 JA |
5913 | } |
5914 | ||
aa43477b | 5915 | static void io_apoll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5916 | { |
5917 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 5918 | int ret; |
18bceab1 | 5919 | |
5106dd6e | 5920 | ret = io_poll_check_events(req, *locked); |
aa43477b PB |
5921 | if (ret > 0) |
5922 | return; | |
18bceab1 | 5923 | |
aa43477b PB |
5924 | io_poll_remove_entries(req); |
5925 | spin_lock(&ctx->completion_lock); | |
5926 | hash_del(&req->hash_node); | |
5927 | spin_unlock(&ctx->completion_lock); | |
18bceab1 | 5928 | |
aa43477b PB |
5929 | if (!ret) |
5930 | io_req_task_submit(req, locked); | |
5931 | else | |
5932 | io_req_complete_failed(req, ret); | |
18bceab1 JA |
5933 | } |
5934 | ||
81459350 | 5935 | static void __io_poll_execute(struct io_kiocb *req, int mask, int events) |
aa43477b PB |
5936 | { |
5937 | req->result = mask; | |
81459350 JA |
5938 | /* |
5939 | * This is useful for poll that is armed on behalf of another | |
5940 | * request, and where the wakeup path could be on a different | |
5941 | * CPU. We want to avoid pulling in req->apoll->events for that | |
5942 | * case. | |
5943 | */ | |
5944 | req->cflags = events; | |
aa43477b PB |
5945 | if (req->opcode == IORING_OP_POLL_ADD) |
5946 | req->io_task_work.func = io_poll_task_func; | |
5947 | else | |
5948 | req->io_task_work.func = io_apoll_task_func; | |
5949 | ||
502c87d6 | 5950 | trace_io_uring_task_add(req->ctx, req, req->user_data, req->opcode, mask); |
aa43477b PB |
5951 | io_req_task_work_add(req, false); |
5952 | } | |
5953 | ||
81459350 | 5954 | static inline void io_poll_execute(struct io_kiocb *req, int res, int events) |
aa43477b PB |
5955 | { |
5956 | if (io_poll_get_ownership(req)) | |
81459350 | 5957 | __io_poll_execute(req, res, events); |
aa43477b PB |
5958 | } |
5959 | ||
5960 | static void io_poll_cancel_req(struct io_kiocb *req) | |
5961 | { | |
5962 | io_poll_mark_cancelled(req); | |
5963 | /* kick tw, which should complete the request */ | |
81459350 | 5964 | io_poll_execute(req, 0, 0); |
aa43477b PB |
5965 | } |
5966 | ||
d89a4fac JA |
5967 | #define wqe_to_req(wait) ((void *)((unsigned long) (wait)->private & ~1)) |
5968 | #define wqe_is_double(wait) ((unsigned long) (wait)->private & 1) | |
5969 | ||
aa43477b PB |
5970 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5971 | void *key) | |
18bceab1 | 5972 | { |
d89a4fac | 5973 | struct io_kiocb *req = wqe_to_req(wait); |
aa43477b PB |
5974 | struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, |
5975 | wait); | |
18bceab1 JA |
5976 | __poll_t mask = key_to_poll(key); |
5977 | ||
791f3465 PB |
5978 | if (unlikely(mask & POLLFREE)) { |
5979 | io_poll_mark_cancelled(req); | |
5980 | /* we have to kick tw in case it's not already */ | |
81459350 | 5981 | io_poll_execute(req, 0, poll->events); |
791f3465 PB |
5982 | |
5983 | /* | |
5984 | * If the waitqueue is being freed early but someone is already | |
5985 | * holds ownership over it, we have to tear down the request as | |
5986 | * best we can. That means immediately removing the request from | |
5987 | * its waitqueue and preventing all further accesses to the | |
5988 | * waitqueue via the request. | |
5989 | */ | |
5990 | list_del_init(&poll->wait.entry); | |
5991 | ||
5992 | /* | |
5993 | * Careful: this *must* be the last step, since as soon | |
5994 | * as req->head is NULL'ed out, the request can be | |
5995 | * completed and freed, since aio_poll_complete_work() | |
5996 | * will no longer need to take the waitqueue lock. | |
5997 | */ | |
5998 | smp_store_release(&poll->head, NULL); | |
5999 | return 1; | |
6000 | } | |
6001 | ||
aa43477b | 6002 | /* for instances that support it check for an event match first */ |
18bceab1 JA |
6003 | if (mask && !(mask & poll->events)) |
6004 | return 0; | |
6005 | ||
eb0089d6 PB |
6006 | if (io_poll_get_ownership(req)) { |
6007 | /* optional, saves extra locking for removal in tw handler */ | |
6008 | if (mask && poll->events & EPOLLONESHOT) { | |
6009 | list_del_init(&poll->wait.entry); | |
6010 | poll->head = NULL; | |
d89a4fac JA |
6011 | if (wqe_is_double(wait)) |
6012 | req->flags &= ~REQ_F_DOUBLE_POLL; | |
6013 | else | |
6014 | req->flags &= ~REQ_F_SINGLE_POLL; | |
eb0089d6 | 6015 | } |
81459350 | 6016 | __io_poll_execute(req, mask, poll->events); |
eb0089d6 | 6017 | } |
18bceab1 | 6018 | return 1; |
18bceab1 JA |
6019 | } |
6020 | ||
6021 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
6022 | struct wait_queue_head *head, |
6023 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
6024 | { |
6025 | struct io_kiocb *req = pt->req; | |
d89a4fac | 6026 | unsigned long wqe_private = (unsigned long) req; |
18bceab1 JA |
6027 | |
6028 | /* | |
68b11e8b PB |
6029 | * The file being polled uses multiple waitqueues for poll handling |
6030 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
6031 | * if this happens. | |
18bceab1 | 6032 | */ |
68b11e8b | 6033 | if (unlikely(pt->nr_entries)) { |
aa43477b | 6034 | struct io_poll_iocb *first = poll; |
58852d4d | 6035 | |
23a65db8 | 6036 | /* double add on the same waitqueue head, ignore */ |
aa43477b | 6037 | if (first->head == head) |
23a65db8 | 6038 | return; |
18bceab1 | 6039 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 6040 | if (*poll_ptr) { |
23a65db8 PB |
6041 | if ((*poll_ptr)->head == head) |
6042 | return; | |
18bceab1 JA |
6043 | pt->error = -EINVAL; |
6044 | return; | |
6045 | } | |
aa43477b | 6046 | |
18bceab1 JA |
6047 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
6048 | if (!poll) { | |
6049 | pt->error = -ENOMEM; | |
6050 | return; | |
6051 | } | |
d89a4fac JA |
6052 | /* mark as double wq entry */ |
6053 | wqe_private |= 1; | |
91eac1c6 | 6054 | req->flags |= REQ_F_DOUBLE_POLL; |
aa43477b | 6055 | io_init_poll_iocb(poll, first->events, first->wait.func); |
807abcb0 | 6056 | *poll_ptr = poll; |
d886e185 PB |
6057 | if (req->opcode == IORING_OP_POLL_ADD) |
6058 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
6059 | } |
6060 | ||
91eac1c6 | 6061 | req->flags |= REQ_F_SINGLE_POLL; |
68b11e8b | 6062 | pt->nr_entries++; |
18bceab1 | 6063 | poll->head = head; |
d89a4fac | 6064 | poll->wait.private = (void *) wqe_private; |
a31eb4a2 JX |
6065 | |
6066 | if (poll->events & EPOLLEXCLUSIVE) | |
6067 | add_wait_queue_exclusive(head, &poll->wait); | |
6068 | else | |
6069 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
6070 | } |
6071 | ||
aa43477b | 6072 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
18bceab1 JA |
6073 | struct poll_table_struct *p) |
6074 | { | |
6075 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
d7718a9d | 6076 | |
aa43477b PB |
6077 | __io_queue_proc(&pt->req->poll, pt, head, |
6078 | (struct io_poll_iocb **) &pt->req->async_data); | |
d7718a9d JA |
6079 | } |
6080 | ||
aa43477b PB |
6081 | static int __io_arm_poll_handler(struct io_kiocb *req, |
6082 | struct io_poll_iocb *poll, | |
6083 | struct io_poll_table *ipt, __poll_t mask) | |
d7718a9d JA |
6084 | { |
6085 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 6086 | int v; |
d7718a9d | 6087 | |
4d52f338 | 6088 | INIT_HLIST_NODE(&req->hash_node); |
aa43477b | 6089 | io_init_poll_iocb(poll, mask, io_poll_wake); |
b90cd197 | 6090 | poll->file = req->file; |
d7718a9d JA |
6091 | |
6092 | ipt->pt._key = mask; | |
6093 | ipt->req = req; | |
68b11e8b PB |
6094 | ipt->error = 0; |
6095 | ipt->nr_entries = 0; | |
d7718a9d | 6096 | |
aa43477b PB |
6097 | /* |
6098 | * Take the ownership to delay any tw execution up until we're done | |
6099 | * with poll arming. see io_poll_get_ownership(). | |
6100 | */ | |
6101 | atomic_set(&req->poll_refs, 1); | |
d7718a9d | 6102 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
aa43477b PB |
6103 | |
6104 | if (mask && (poll->events & EPOLLONESHOT)) { | |
6105 | io_poll_remove_entries(req); | |
6106 | /* no one else has access to the req, forget about the ref */ | |
6107 | return mask; | |
6108 | } | |
6109 | if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { | |
6110 | io_poll_remove_entries(req); | |
6111 | if (!ipt->error) | |
6112 | ipt->error = -EINVAL; | |
6113 | return 0; | |
6114 | } | |
d7718a9d | 6115 | |
79ebeaee | 6116 | spin_lock(&ctx->completion_lock); |
aa43477b PB |
6117 | io_poll_req_insert(req); |
6118 | spin_unlock(&ctx->completion_lock); | |
6119 | ||
6120 | if (mask) { | |
6121 | /* can't multishot if failed, just queue the event we've got */ | |
6122 | if (unlikely(ipt->error || !ipt->nr_entries)) | |
6123 | poll->events |= EPOLLONESHOT; | |
81459350 | 6124 | __io_poll_execute(req, mask, poll->events); |
aa43477b | 6125 | return 0; |
d7718a9d JA |
6126 | } |
6127 | ||
aa43477b PB |
6128 | /* |
6129 | * Release ownership. If someone tried to queue a tw while it was | |
6130 | * locked, kick it off for them. | |
6131 | */ | |
6132 | v = atomic_dec_return(&req->poll_refs); | |
6133 | if (unlikely(v & IO_POLL_REF_MASK)) | |
81459350 | 6134 | __io_poll_execute(req, 0, poll->events); |
aa43477b PB |
6135 | return 0; |
6136 | } | |
6137 | ||
6138 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
6139 | struct poll_table_struct *p) | |
6140 | { | |
6141 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
6142 | struct async_poll *apoll = pt->req->apoll; | |
6143 | ||
6144 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); | |
d7718a9d JA |
6145 | } |
6146 | ||
59b735ae OL |
6147 | enum { |
6148 | IO_APOLL_OK, | |
6149 | IO_APOLL_ABORTED, | |
6150 | IO_APOLL_READY | |
6151 | }; | |
6152 | ||
4d9237e3 | 6153 | static int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) |
d7718a9d JA |
6154 | { |
6155 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
6156 | struct io_ring_ctx *ctx = req->ctx; | |
6157 | struct async_poll *apoll; | |
6158 | struct io_poll_table ipt; | |
aa43477b PB |
6159 | __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI; |
6160 | int ret; | |
d7718a9d | 6161 | |
b2d9c3da PB |
6162 | if (!def->pollin && !def->pollout) |
6163 | return IO_APOLL_ABORTED; | |
658d0a40 PB |
6164 | if (!file_can_poll(req->file) || (req->flags & REQ_F_POLLED)) |
6165 | return IO_APOLL_ABORTED; | |
b2d9c3da PB |
6166 | |
6167 | if (def->pollin) { | |
b2d9c3da PB |
6168 | mask |= POLLIN | POLLRDNORM; |
6169 | ||
6170 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
6171 | if ((req->opcode == IORING_OP_RECVMSG) && | |
6172 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
6173 | mask &= ~POLLIN; | |
6174 | } else { | |
b2d9c3da PB |
6175 | mask |= POLLOUT | POLLWRNORM; |
6176 | } | |
52dd8640 DY |
6177 | if (def->poll_exclusive) |
6178 | mask |= EPOLLEXCLUSIVE; | |
4d9237e3 JA |
6179 | if (!(issue_flags & IO_URING_F_UNLOCKED) && |
6180 | !list_empty(&ctx->apoll_cache)) { | |
6181 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, | |
6182 | poll.wait.entry); | |
6183 | list_del_init(&apoll->poll.wait.entry); | |
6184 | } else { | |
6185 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
6186 | if (unlikely(!apoll)) | |
6187 | return IO_APOLL_ABORTED; | |
6188 | } | |
807abcb0 | 6189 | apoll->double_poll = NULL; |
d7718a9d | 6190 | req->apoll = apoll; |
b2d9c3da | 6191 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
6192 | ipt.pt._qproc = io_async_queue_proc; |
6193 | ||
4d55f238 | 6194 | io_kbuf_recycle(req, issue_flags); |
abdad709 | 6195 | |
aa43477b | 6196 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); |
41a5169c HX |
6197 | if (ret || ipt.error) |
6198 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
6199 | ||
502c87d6 | 6200 | trace_io_uring_poll_arm(ctx, req, req->user_data, req->opcode, |
236daeae | 6201 | mask, apoll->poll.events); |
59b735ae | 6202 | return IO_APOLL_OK; |
d7718a9d JA |
6203 | } |
6204 | ||
76e1b642 JA |
6205 | /* |
6206 | * Returns true if we found and killed one or more poll requests | |
6207 | */ | |
c072481d PB |
6208 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
6209 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 6210 | { |
78076bb6 | 6211 | struct hlist_node *tmp; |
221c5eb2 | 6212 | struct io_kiocb *req; |
aa43477b PB |
6213 | bool found = false; |
6214 | int i; | |
221c5eb2 | 6215 | |
79ebeaee | 6216 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
6217 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
6218 | struct hlist_head *list; | |
6219 | ||
6220 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 6221 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
42a7b4ed | 6222 | if (io_match_task_safe(req, tsk, cancel_all)) { |
61bc84c4 | 6223 | hlist_del_init(&req->hash_node); |
aa43477b PB |
6224 | io_poll_cancel_req(req); |
6225 | found = true; | |
6226 | } | |
f3606e3a | 6227 | } |
221c5eb2 | 6228 | } |
79ebeaee | 6229 | spin_unlock(&ctx->completion_lock); |
aa43477b | 6230 | return found; |
221c5eb2 JA |
6231 | } |
6232 | ||
9ba5fac8 PB |
6233 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
6234 | bool poll_only) | |
e07785b0 | 6235 | __must_hold(&ctx->completion_lock) |
47f46768 | 6236 | { |
78076bb6 | 6237 | struct hlist_head *list; |
47f46768 JA |
6238 | struct io_kiocb *req; |
6239 | ||
78076bb6 JA |
6240 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
6241 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
6242 | if (sqe_addr != req->user_data) |
6243 | continue; | |
9ba5fac8 PB |
6244 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
6245 | continue; | |
b2cb805f | 6246 | return req; |
47f46768 | 6247 | } |
b2cb805f JA |
6248 | return NULL; |
6249 | } | |
6250 | ||
aa43477b PB |
6251 | static bool io_poll_disarm(struct io_kiocb *req) |
6252 | __must_hold(&ctx->completion_lock) | |
6253 | { | |
6254 | if (!io_poll_get_ownership(req)) | |
6255 | return false; | |
6256 | io_poll_remove_entries(req); | |
6257 | hash_del(&req->hash_node); | |
6258 | return true; | |
6259 | } | |
6260 | ||
9ba5fac8 PB |
6261 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
6262 | bool poll_only) | |
e07785b0 | 6263 | __must_hold(&ctx->completion_lock) |
b2cb805f | 6264 | { |
aa43477b | 6265 | struct io_kiocb *req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f | 6266 | |
b2cb805f JA |
6267 | if (!req) |
6268 | return -ENOENT; | |
aa43477b PB |
6269 | io_poll_cancel_req(req); |
6270 | return 0; | |
47f46768 JA |
6271 | } |
6272 | ||
9096af3e PB |
6273 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
6274 | unsigned int flags) | |
6275 | { | |
6276 | u32 events; | |
47f46768 | 6277 | |
9096af3e PB |
6278 | events = READ_ONCE(sqe->poll32_events); |
6279 | #ifdef __BIG_ENDIAN | |
6280 | events = swahw32(events); | |
6281 | #endif | |
6282 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
6283 | events |= EPOLLONESHOT; | |
6284 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
6285 | } |
6286 | ||
c5de0036 | 6287 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 6288 | const struct io_uring_sqe *sqe) |
0969e783 | 6289 | { |
c5de0036 PB |
6290 | struct io_poll_update *upd = &req->poll_update; |
6291 | u32 flags; | |
6292 | ||
0969e783 JA |
6293 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6294 | return -EINVAL; | |
26578cda | 6295 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
6296 | return -EINVAL; |
6297 | flags = READ_ONCE(sqe->len); | |
6298 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
6299 | IORING_POLL_ADD_MULTI)) | |
6300 | return -EINVAL; | |
6301 | /* meaningless without update */ | |
6302 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
6303 | return -EINVAL; |
6304 | ||
c5de0036 PB |
6305 | upd->old_user_data = READ_ONCE(sqe->addr); |
6306 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
6307 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 6308 | |
c5de0036 PB |
6309 | upd->new_user_data = READ_ONCE(sqe->off); |
6310 | if (!upd->update_user_data && upd->new_user_data) | |
6311 | return -EINVAL; | |
6312 | if (upd->update_events) | |
6313 | upd->events = io_poll_parse_events(sqe, flags); | |
6314 | else if (sqe->poll32_events) | |
6315 | return -EINVAL; | |
221c5eb2 | 6316 | |
221c5eb2 JA |
6317 | return 0; |
6318 | } | |
6319 | ||
3529d8c2 | 6320 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
6321 | { |
6322 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 6323 | u32 flags; |
221c5eb2 JA |
6324 | |
6325 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
6326 | return -EINVAL; | |
c5de0036 | 6327 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
6328 | return -EINVAL; |
6329 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 6330 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 | 6331 | return -EINVAL; |
04c76b41 PB |
6332 | if ((flags & IORING_POLL_ADD_MULTI) && (req->flags & REQ_F_CQE_SKIP)) |
6333 | return -EINVAL; | |
221c5eb2 | 6334 | |
48dcd38d | 6335 | io_req_set_refcount(req); |
81459350 | 6336 | req->cflags = poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
6337 | return 0; |
6338 | } | |
6339 | ||
61e98203 | 6340 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
6341 | { |
6342 | struct io_poll_iocb *poll = &req->poll; | |
0969e783 | 6343 | struct io_poll_table ipt; |
aa43477b | 6344 | int ret; |
0969e783 | 6345 | |
d7718a9d | 6346 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 6347 | |
aa43477b PB |
6348 | ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); |
6349 | ret = ret ?: ipt.error; | |
6350 | if (ret) | |
6351 | __io_req_complete(req, issue_flags, ret, 0); | |
6352 | return 0; | |
221c5eb2 JA |
6353 | } |
6354 | ||
c5de0036 | 6355 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
6356 | { |
6357 | struct io_ring_ctx *ctx = req->ctx; | |
6358 | struct io_kiocb *preq; | |
2bbb146d | 6359 | int ret2, ret = 0; |
cc8e9ba7 | 6360 | bool locked; |
b69de288 | 6361 | |
79ebeaee | 6362 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 6363 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
aa43477b | 6364 | if (!preq || !io_poll_disarm(preq)) { |
79ebeaee | 6365 | spin_unlock(&ctx->completion_lock); |
aa43477b | 6366 | ret = preq ? -EALREADY : -ENOENT; |
2bbb146d | 6367 | goto out; |
b69de288 | 6368 | } |
79ebeaee | 6369 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 6370 | |
2bbb146d PB |
6371 | if (req->poll_update.update_events || req->poll_update.update_user_data) { |
6372 | /* only mask one event flags, keep behavior flags */ | |
6373 | if (req->poll_update.update_events) { | |
6374 | preq->poll.events &= ~0xffff; | |
6375 | preq->poll.events |= req->poll_update.events & 0xffff; | |
6376 | preq->poll.events |= IO_POLL_UNMASK; | |
cb3b200e | 6377 | } |
2bbb146d PB |
6378 | if (req->poll_update.update_user_data) |
6379 | preq->user_data = req->poll_update.new_user_data; | |
b69de288 | 6380 | |
2bbb146d PB |
6381 | ret2 = io_poll_add(preq, issue_flags); |
6382 | /* successfully updated, don't complete poll request */ | |
6383 | if (!ret2) | |
6384 | goto out; | |
b69de288 | 6385 | } |
6224590d | 6386 | |
2bbb146d | 6387 | req_set_fail(preq); |
cc8e9ba7 PB |
6388 | preq->result = -ECANCELED; |
6389 | locked = !(issue_flags & IO_URING_F_UNLOCKED); | |
6390 | io_req_task_complete(preq, &locked); | |
2bbb146d PB |
6391 | out: |
6392 | if (ret < 0) | |
6224590d | 6393 | req_set_fail(req); |
2bbb146d | 6394 | /* complete update request, we're done with it */ |
cc8e9ba7 | 6395 | __io_req_complete(req, issue_flags, ret, 0); |
b69de288 | 6396 | return 0; |
89850fce JA |
6397 | } |
6398 | ||
5262f567 JA |
6399 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
6400 | { | |
ad8a48ac JA |
6401 | struct io_timeout_data *data = container_of(timer, |
6402 | struct io_timeout_data, timer); | |
6403 | struct io_kiocb *req = data->req; | |
6404 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
6405 | unsigned long flags; |
6406 | ||
89850fce | 6407 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 6408 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
6409 | atomic_set(&req->ctx->cq_timeouts, |
6410 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 6411 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 6412 | |
a90c8bf6 PB |
6413 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) |
6414 | req_set_fail(req); | |
6415 | ||
6416 | req->result = -ETIME; | |
6417 | req->io_task_work.func = io_req_task_complete; | |
4813c377 | 6418 | io_req_task_work_add(req, false); |
5262f567 JA |
6419 | return HRTIMER_NORESTART; |
6420 | } | |
6421 | ||
fbd15848 PB |
6422 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
6423 | __u64 user_data) | |
89850fce | 6424 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 6425 | { |
fbd15848 | 6426 | struct io_timeout_data *io; |
47f46768 | 6427 | struct io_kiocb *req; |
fd9c7bc5 | 6428 | bool found = false; |
f254ac04 | 6429 | |
135fcde8 | 6430 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
6431 | found = user_data == req->user_data; |
6432 | if (found) | |
47f46768 | 6433 | break; |
47f46768 | 6434 | } |
fd9c7bc5 PB |
6435 | if (!found) |
6436 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
6437 | |
6438 | io = req->async_data; | |
fd9c7bc5 | 6439 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 6440 | return ERR_PTR(-EALREADY); |
a71976f3 | 6441 | list_del_init(&req->timeout.list); |
fbd15848 PB |
6442 | return req; |
6443 | } | |
47f46768 | 6444 | |
fbd15848 | 6445 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 6446 | __must_hold(&ctx->completion_lock) |
89850fce | 6447 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
6448 | { |
6449 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
6450 | ||
6451 | if (IS_ERR(req)) | |
6452 | return PTR_ERR(req); | |
6695490d | 6453 | io_req_task_queue_fail(req, -ECANCELED); |
f254ac04 JA |
6454 | return 0; |
6455 | } | |
6456 | ||
50c1df2b JA |
6457 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
6458 | { | |
6459 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
6460 | case IORING_TIMEOUT_BOOTTIME: | |
6461 | return CLOCK_BOOTTIME; | |
6462 | case IORING_TIMEOUT_REALTIME: | |
6463 | return CLOCK_REALTIME; | |
6464 | default: | |
6465 | /* can't happen, vetted at prep time */ | |
6466 | WARN_ON_ONCE(1); | |
6467 | fallthrough; | |
6468 | case 0: | |
6469 | return CLOCK_MONOTONIC; | |
6470 | } | |
6471 | } | |
6472 | ||
f1042b6c PB |
6473 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6474 | struct timespec64 *ts, enum hrtimer_mode mode) | |
6475 | __must_hold(&ctx->timeout_lock) | |
6476 | { | |
6477 | struct io_timeout_data *io; | |
6478 | struct io_kiocb *req; | |
6479 | bool found = false; | |
6480 | ||
6481 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
6482 | found = user_data == req->user_data; | |
6483 | if (found) | |
6484 | break; | |
6485 | } | |
6486 | if (!found) | |
6487 | return -ENOENT; | |
6488 | ||
6489 | io = req->async_data; | |
6490 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
6491 | return -EALREADY; | |
6492 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
6493 | io->timer.function = io_link_timeout_fn; | |
6494 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
6495 | return 0; | |
6496 | } | |
6497 | ||
9c8e11b3 PB |
6498 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6499 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 6500 | __must_hold(&ctx->timeout_lock) |
47f46768 | 6501 | { |
9c8e11b3 PB |
6502 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
6503 | struct io_timeout_data *data; | |
47f46768 | 6504 | |
9c8e11b3 PB |
6505 | if (IS_ERR(req)) |
6506 | return PTR_ERR(req); | |
47f46768 | 6507 | |
9c8e11b3 PB |
6508 | req->timeout.off = 0; /* noseq */ |
6509 | data = req->async_data; | |
6510 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6511 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6512 | data->timer.function = io_timeout_fn; |
6513 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6514 | return 0; | |
47f46768 JA |
6515 | } |
6516 | ||
3529d8c2 JA |
6517 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6518 | const struct io_uring_sqe *sqe) | |
b29472ee | 6519 | { |
9c8e11b3 PB |
6520 | struct io_timeout_rem *tr = &req->timeout_rem; |
6521 | ||
b29472ee JA |
6522 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6523 | return -EINVAL; | |
61710e43 DA |
6524 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6525 | return -EINVAL; | |
26578cda | 6526 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6527 | return -EINVAL; |
6528 | ||
f1042b6c | 6529 | tr->ltimeout = false; |
9c8e11b3 PB |
6530 | tr->addr = READ_ONCE(sqe->addr); |
6531 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6532 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6533 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6534 | return -EINVAL; | |
6535 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6536 | tr->ltimeout = true; | |
6537 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6538 | return -EINVAL; |
6539 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6540 | return -EFAULT; | |
2087009c YB |
6541 | if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) |
6542 | return -EINVAL; | |
9c8e11b3 PB |
6543 | } else if (tr->flags) { |
6544 | /* timeout removal doesn't support flags */ | |
b29472ee | 6545 | return -EINVAL; |
9c8e11b3 | 6546 | } |
b29472ee | 6547 | |
b29472ee JA |
6548 | return 0; |
6549 | } | |
6550 | ||
8662daec PB |
6551 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6552 | { | |
6553 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6554 | : HRTIMER_MODE_REL; | |
6555 | } | |
6556 | ||
11365043 JA |
6557 | /* |
6558 | * Remove or update an existing timeout command | |
6559 | */ | |
61e98203 | 6560 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6561 | { |
9c8e11b3 | 6562 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6563 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6564 | int ret; |
11365043 | 6565 | |
ec3c3d0f PB |
6566 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6567 | spin_lock(&ctx->completion_lock); | |
6568 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6569 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6570 | spin_unlock_irq(&ctx->timeout_lock); |
6571 | spin_unlock(&ctx->completion_lock); | |
6572 | } else { | |
f1042b6c PB |
6573 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6574 | ||
ec3c3d0f | 6575 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6576 | if (tr->ltimeout) |
6577 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6578 | else | |
6579 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6580 | spin_unlock_irq(&ctx->timeout_lock); |
6581 | } | |
11365043 | 6582 | |
4e88d6e7 | 6583 | if (ret < 0) |
93d2bcd2 | 6584 | req_set_fail(req); |
505657bc | 6585 | io_req_complete_post(req, ret, 0); |
11365043 | 6586 | return 0; |
5262f567 JA |
6587 | } |
6588 | ||
3529d8c2 | 6589 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6590 | bool is_timeout_link) |
5262f567 | 6591 | { |
ad8a48ac | 6592 | struct io_timeout_data *data; |
a41525ab | 6593 | unsigned flags; |
56080b02 | 6594 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6595 | |
ad8a48ac | 6596 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6597 | return -EINVAL; |
26578cda PB |
6598 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6599 | sqe->splice_fd_in) | |
a41525ab | 6600 | return -EINVAL; |
56080b02 | 6601 | if (off && is_timeout_link) |
2d28390a | 6602 | return -EINVAL; |
a41525ab | 6603 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
6604 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
6605 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
6606 | return -EINVAL; |
6607 | /* more than one clock specified is invalid, obviously */ | |
6608 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6609 | return -EINVAL; |
bdf20073 | 6610 | |
ef9dd637 | 6611 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6612 | req->timeout.off = off; |
f18ee4cf PB |
6613 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6614 | req->ctx->off_timeout_used = true; | |
26a61679 | 6615 | |
d6a644a7 PB |
6616 | if (WARN_ON_ONCE(req_has_async_data(req))) |
6617 | return -EFAULT; | |
6618 | if (io_alloc_async_data(req)) | |
26a61679 JA |
6619 | return -ENOMEM; |
6620 | ||
e8c2bc1f | 6621 | data = req->async_data; |
ad8a48ac | 6622 | data->req = req; |
50c1df2b | 6623 | data->flags = flags; |
ad8a48ac JA |
6624 | |
6625 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6626 | return -EFAULT; |
6627 | ||
f6223ff7 YB |
6628 | if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) |
6629 | return -EINVAL; | |
6630 | ||
8662daec | 6631 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6632 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6633 | |
6634 | if (is_timeout_link) { | |
6635 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6636 | ||
6637 | if (!link->head) | |
6638 | return -EINVAL; | |
6639 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6640 | return -EINVAL; | |
4d13d1a4 PB |
6641 | req->timeout.head = link->last; |
6642 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6643 | } |
ad8a48ac JA |
6644 | return 0; |
6645 | } | |
6646 | ||
61e98203 | 6647 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6648 | { |
ad8a48ac | 6649 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6650 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6651 | struct list_head *entry; |
bfe68a22 | 6652 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6653 | |
89850fce | 6654 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6655 | |
5262f567 JA |
6656 | /* |
6657 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6658 | * timeout event to be satisfied. If it isn't set, then this is |
6659 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6660 | */ |
8eb7e2d0 | 6661 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6662 | entry = ctx->timeout_list.prev; |
6663 | goto add; | |
6664 | } | |
5262f567 | 6665 | |
bfe68a22 PB |
6666 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6667 | req->timeout.target_seq = tail + off; | |
5262f567 | 6668 | |
f010505b MDG |
6669 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6670 | * This is safe because ->completion_lock is held, and submissions | |
6671 | * and completions are never mixed in the same ->completion_lock section. | |
6672 | */ | |
6673 | ctx->cq_last_tm_flush = tail; | |
6674 | ||
5262f567 JA |
6675 | /* |
6676 | * Insertion sort, ensuring the first entry in the list is always | |
6677 | * the one we need first. | |
6678 | */ | |
5262f567 | 6679 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6680 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6681 | timeout.list); | |
5262f567 | 6682 | |
8eb7e2d0 | 6683 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6684 | continue; |
bfe68a22 PB |
6685 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6686 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6687 | break; |
6688 | } | |
93bd25bb | 6689 | add: |
135fcde8 | 6690 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6691 | data->timer.function = io_timeout_fn; |
6692 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6693 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6694 | return 0; |
6695 | } | |
5262f567 | 6696 | |
f458dd84 PB |
6697 | struct io_cancel_data { |
6698 | struct io_ring_ctx *ctx; | |
6699 | u64 user_data; | |
6700 | }; | |
6701 | ||
62755e35 JA |
6702 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6703 | { | |
6704 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6705 | struct io_cancel_data *cd = data; |
62755e35 | 6706 | |
f458dd84 | 6707 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6708 | } |
6709 | ||
f458dd84 PB |
6710 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6711 | struct io_ring_ctx *ctx) | |
62755e35 | 6712 | { |
f458dd84 | 6713 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6714 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6715 | int ret = 0; |
6716 | ||
f458dd84 | 6717 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6718 | return -ENOENT; |
6719 | ||
f458dd84 | 6720 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6721 | switch (cancel_ret) { |
6722 | case IO_WQ_CANCEL_OK: | |
6723 | ret = 0; | |
6724 | break; | |
6725 | case IO_WQ_CANCEL_RUNNING: | |
6726 | ret = -EALREADY; | |
6727 | break; | |
6728 | case IO_WQ_CANCEL_NOTFOUND: | |
6729 | ret = -ENOENT; | |
6730 | break; | |
6731 | } | |
6732 | ||
e977d6d3 JA |
6733 | return ret; |
6734 | } | |
6735 | ||
8cb01fac | 6736 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6737 | { |
8cb01fac | 6738 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6739 | int ret; |
6740 | ||
dadebc35 | 6741 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6742 | |
f458dd84 | 6743 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
ccbf7261 JA |
6744 | /* |
6745 | * Fall-through even for -EALREADY, as we may have poll armed | |
6746 | * that need unarming. | |
6747 | */ | |
6748 | if (!ret) | |
6749 | return 0; | |
505657bc PB |
6750 | |
6751 | spin_lock(&ctx->completion_lock); | |
ccbf7261 JA |
6752 | ret = io_poll_cancel(ctx, sqe_addr, false); |
6753 | if (ret != -ENOENT) | |
6754 | goto out; | |
6755 | ||
79ebeaee | 6756 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6757 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6758 | spin_unlock_irq(&ctx->timeout_lock); |
505657bc PB |
6759 | out: |
6760 | spin_unlock(&ctx->completion_lock); | |
6761 | return ret; | |
47f46768 JA |
6762 | } |
6763 | ||
3529d8c2 JA |
6764 | static int io_async_cancel_prep(struct io_kiocb *req, |
6765 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6766 | { |
fbf23849 | 6767 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6768 | return -EINVAL; |
61710e43 DA |
6769 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6770 | return -EINVAL; | |
26578cda PB |
6771 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6772 | sqe->splice_fd_in) | |
e977d6d3 JA |
6773 | return -EINVAL; |
6774 | ||
fbf23849 JA |
6775 | req->cancel.addr = READ_ONCE(sqe->addr); |
6776 | return 0; | |
6777 | } | |
6778 | ||
61e98203 | 6779 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6780 | { |
6781 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 | 6782 | u64 sqe_addr = req->cancel.addr; |
3b44b371 | 6783 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
58f99373 PB |
6784 | struct io_tctx_node *node; |
6785 | int ret; | |
6786 | ||
8cb01fac | 6787 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6788 | if (ret != -ENOENT) |
6789 | goto done; | |
58f99373 PB |
6790 | |
6791 | /* slow path, try all io-wq's */ | |
3b44b371 | 6792 | io_ring_submit_lock(ctx, needs_lock); |
58f99373 PB |
6793 | ret = -ENOENT; |
6794 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6795 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6796 | |
58f99373 PB |
6797 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6798 | if (ret != -ENOENT) | |
6799 | break; | |
6800 | } | |
3b44b371 | 6801 | io_ring_submit_unlock(ctx, needs_lock); |
58f99373 | 6802 | done: |
58f99373 | 6803 | if (ret < 0) |
93d2bcd2 | 6804 | req_set_fail(req); |
505657bc | 6805 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6806 | return 0; |
6807 | } | |
6808 | ||
269bbe5f | 6809 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6810 | const struct io_uring_sqe *sqe) |
6811 | { | |
61710e43 DA |
6812 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6813 | return -EINVAL; | |
26578cda | 6814 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6815 | return -EINVAL; |
6816 | ||
269bbe5f BM |
6817 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6818 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6819 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6820 | return -EINVAL; |
269bbe5f | 6821 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6822 | return 0; |
6823 | } | |
6824 | ||
889fca73 | 6825 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6826 | { |
6827 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 6828 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
c3bdad02 | 6829 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6830 | int ret; |
fbf23849 | 6831 | |
269bbe5f BM |
6832 | up.offset = req->rsrc_update.offset; |
6833 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6834 | up.nr = 0; |
6835 | up.tags = 0; | |
615cee49 | 6836 | up.resv = 0; |
05f3fb3c | 6837 | |
3b44b371 | 6838 | io_ring_submit_lock(ctx, needs_lock); |
fdecb662 | 6839 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6840 | &up, req->rsrc_update.nr_args); |
3b44b371 | 6841 | io_ring_submit_unlock(ctx, needs_lock); |
05f3fb3c JA |
6842 | |
6843 | if (ret < 0) | |
93d2bcd2 | 6844 | req_set_fail(req); |
889fca73 | 6845 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6846 | return 0; |
6847 | } | |
6848 | ||
bfe76559 | 6849 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6850 | { |
d625c6ee | 6851 | switch (req->opcode) { |
e781573e | 6852 | case IORING_OP_NOP: |
bfe76559 | 6853 | return 0; |
f67676d1 JA |
6854 | case IORING_OP_READV: |
6855 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6856 | case IORING_OP_READ: |
f67676d1 JA |
6857 | case IORING_OP_WRITEV: |
6858 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6859 | case IORING_OP_WRITE: |
584b0180 | 6860 | return io_prep_rw(req, sqe); |
0969e783 | 6861 | case IORING_OP_POLL_ADD: |
bfe76559 | 6862 | return io_poll_add_prep(req, sqe); |
0969e783 | 6863 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6864 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6865 | case IORING_OP_FSYNC: |
1155c76a | 6866 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6867 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6868 | return io_sfr_prep(req, sqe); |
03b1230c | 6869 | case IORING_OP_SENDMSG: |
fddaface | 6870 | case IORING_OP_SEND: |
bfe76559 | 6871 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6872 | case IORING_OP_RECVMSG: |
fddaface | 6873 | case IORING_OP_RECV: |
bfe76559 | 6874 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6875 | case IORING_OP_CONNECT: |
bfe76559 | 6876 | return io_connect_prep(req, sqe); |
2d28390a | 6877 | case IORING_OP_TIMEOUT: |
bfe76559 | 6878 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6879 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6880 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6881 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6882 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6883 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6884 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6885 | case IORING_OP_ACCEPT: |
bfe76559 | 6886 | return io_accept_prep(req, sqe); |
d63d1b5e | 6887 | case IORING_OP_FALLOCATE: |
bfe76559 | 6888 | return io_fallocate_prep(req, sqe); |
15b71abe | 6889 | case IORING_OP_OPENAT: |
bfe76559 | 6890 | return io_openat_prep(req, sqe); |
b5dba59e | 6891 | case IORING_OP_CLOSE: |
bfe76559 | 6892 | return io_close_prep(req, sqe); |
05f3fb3c | 6893 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6894 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6895 | case IORING_OP_STATX: |
bfe76559 | 6896 | return io_statx_prep(req, sqe); |
4840e418 | 6897 | case IORING_OP_FADVISE: |
bfe76559 | 6898 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6899 | case IORING_OP_MADVISE: |
bfe76559 | 6900 | return io_madvise_prep(req, sqe); |
cebdb986 | 6901 | case IORING_OP_OPENAT2: |
bfe76559 | 6902 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6903 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6904 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6905 | case IORING_OP_SPLICE: |
bfe76559 | 6906 | return io_splice_prep(req, sqe); |
ddf0322d | 6907 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6908 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6909 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6910 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6911 | case IORING_OP_TEE: |
bfe76559 | 6912 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6913 | case IORING_OP_SHUTDOWN: |
6914 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6915 | case IORING_OP_RENAMEAT: |
6916 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6917 | case IORING_OP_UNLINKAT: |
6918 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6919 | case IORING_OP_MKDIRAT: |
6920 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6921 | case IORING_OP_SYMLINKAT: |
6922 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6923 | case IORING_OP_LINKAT: |
6924 | return io_linkat_prep(req, sqe); | |
4f57f06c JA |
6925 | case IORING_OP_MSG_RING: |
6926 | return io_msg_ring_prep(req, sqe); | |
f67676d1 JA |
6927 | } |
6928 | ||
bfe76559 PB |
6929 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6930 | req->opcode); | |
bd54b6fe | 6931 | return -EINVAL; |
bfe76559 PB |
6932 | } |
6933 | ||
93642ef8 | 6934 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6935 | { |
b7e298d2 PB |
6936 | if (!io_op_defs[req->opcode].needs_async_setup) |
6937 | return 0; | |
d886e185 | 6938 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
6939 | return -EFAULT; |
6940 | if (io_alloc_async_data(req)) | |
6941 | return -EAGAIN; | |
6942 | ||
93642ef8 PB |
6943 | switch (req->opcode) { |
6944 | case IORING_OP_READV: | |
93642ef8 PB |
6945 | return io_rw_prep_async(req, READ); |
6946 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6947 | return io_rw_prep_async(req, WRITE); |
6948 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6949 | return io_sendmsg_prep_async(req); |
6950 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6951 | return io_recvmsg_prep_async(req); |
6952 | case IORING_OP_CONNECT: | |
6953 | return io_connect_prep_async(req); | |
6954 | } | |
b7e298d2 PB |
6955 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6956 | req->opcode); | |
6957 | return -EFAULT; | |
f67676d1 JA |
6958 | } |
6959 | ||
9cf7c104 PB |
6960 | static u32 io_get_sequence(struct io_kiocb *req) |
6961 | { | |
a3dbdf54 | 6962 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6963 | |
a3dbdf54 PB |
6964 | /* need original cached_sq_head, but it was increased for each req */ |
6965 | io_for_each_link(req, req) | |
6966 | seq--; | |
6967 | return seq; | |
9cf7c104 PB |
6968 | } |
6969 | ||
c072481d | 6970 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 6971 | { |
a197f664 | 6972 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6973 | struct io_defer_entry *de; |
f67676d1 | 6974 | int ret; |
e0eb71dc | 6975 | u32 seq = io_get_sequence(req); |
3c19966d | 6976 | |
9d858b21 | 6977 | /* Still need defer if there is pending req in defer list. */ |
e302f104 | 6978 | spin_lock(&ctx->completion_lock); |
5e371265 | 6979 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e302f104 | 6980 | spin_unlock(&ctx->completion_lock); |
e0eb71dc | 6981 | queue: |
10c66904 | 6982 | ctx->drain_active = false; |
e0eb71dc PB |
6983 | io_req_task_queue(req); |
6984 | return; | |
10c66904 | 6985 | } |
e302f104 | 6986 | spin_unlock(&ctx->completion_lock); |
9cf7c104 | 6987 | |
b7e298d2 | 6988 | ret = io_req_prep_async(req); |
e0eb71dc PB |
6989 | if (ret) { |
6990 | fail: | |
6991 | io_req_complete_failed(req, ret); | |
6992 | return; | |
6993 | } | |
cbdcb435 | 6994 | io_prep_async_link(req); |
27dc8338 | 6995 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6996 | if (!de) { |
1b48773f | 6997 | ret = -ENOMEM; |
e0eb71dc | 6998 | goto fail; |
76cc33d7 | 6999 | } |
2d28390a | 7000 | |
79ebeaee | 7001 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 7002 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 7003 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 7004 | kfree(de); |
e0eb71dc | 7005 | goto queue; |
de0617e4 JA |
7006 | } |
7007 | ||
502c87d6 | 7008 | trace_io_uring_defer(ctx, req, req->user_data, req->opcode); |
27dc8338 | 7009 | de->req = req; |
9cf7c104 | 7010 | de->seq = seq; |
27dc8338 | 7011 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 7012 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
7013 | } |
7014 | ||
68fb8979 | 7015 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 7016 | { |
8197b053 PB |
7017 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
7018 | spin_lock(&req->ctx->completion_lock); | |
cc3cec83 | 7019 | io_put_kbuf_comp(req); |
8197b053 PB |
7020 | spin_unlock(&req->ctx->completion_lock); |
7021 | } | |
99bc4c38 | 7022 | |
0e1b6fe3 PB |
7023 | if (req->flags & REQ_F_NEED_CLEANUP) { |
7024 | switch (req->opcode) { | |
7025 | case IORING_OP_READV: | |
7026 | case IORING_OP_READ_FIXED: | |
7027 | case IORING_OP_READ: | |
7028 | case IORING_OP_WRITEV: | |
7029 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
7030 | case IORING_OP_WRITE: { |
7031 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
7032 | |
7033 | kfree(io->free_iovec); | |
0e1b6fe3 | 7034 | break; |
e8c2bc1f | 7035 | } |
0e1b6fe3 | 7036 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
7037 | case IORING_OP_SENDMSG: { |
7038 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
7039 | |
7040 | kfree(io->free_iov); | |
0e1b6fe3 | 7041 | break; |
e8c2bc1f | 7042 | } |
f3cd4850 JA |
7043 | case IORING_OP_OPENAT: |
7044 | case IORING_OP_OPENAT2: | |
7045 | if (req->open.filename) | |
7046 | putname(req->open.filename); | |
7047 | break; | |
80a261fd JA |
7048 | case IORING_OP_RENAMEAT: |
7049 | putname(req->rename.oldpath); | |
7050 | putname(req->rename.newpath); | |
7051 | break; | |
14a1143b JA |
7052 | case IORING_OP_UNLINKAT: |
7053 | putname(req->unlink.filename); | |
7054 | break; | |
e34a02dc DK |
7055 | case IORING_OP_MKDIRAT: |
7056 | putname(req->mkdir.filename); | |
7057 | break; | |
7a8721f8 DK |
7058 | case IORING_OP_SYMLINKAT: |
7059 | putname(req->symlink.oldpath); | |
7060 | putname(req->symlink.newpath); | |
7061 | break; | |
cf30da90 DK |
7062 | case IORING_OP_LINKAT: |
7063 | putname(req->hardlink.oldpath); | |
7064 | putname(req->hardlink.newpath); | |
7065 | break; | |
1b6fe6e0 SR |
7066 | case IORING_OP_STATX: |
7067 | if (req->statx.filename) | |
7068 | putname(req->statx.filename); | |
7069 | break; | |
0e1b6fe3 | 7070 | } |
99bc4c38 | 7071 | } |
75652a30 JA |
7072 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
7073 | kfree(req->apoll->double_poll); | |
7074 | kfree(req->apoll); | |
7075 | req->apoll = NULL; | |
7076 | } | |
c854357b | 7077 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 7078 | put_cred(req->creds); |
d886e185 PB |
7079 | if (req->flags & REQ_F_ASYNC_DATA) { |
7080 | kfree(req->async_data); | |
7081 | req->async_data = NULL; | |
7082 | } | |
c854357b | 7083 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
7084 | } |
7085 | ||
6bf9c47a JA |
7086 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags) |
7087 | { | |
7088 | if (req->file || !io_op_defs[req->opcode].needs_file) | |
7089 | return true; | |
7090 | ||
7091 | if (req->flags & REQ_F_FIXED_FILE) | |
7092 | req->file = io_file_get_fixed(req, req->work.fd, issue_flags); | |
7093 | else | |
7094 | req->file = io_file_get_normal(req, req->work.fd); | |
7095 | if (req->file) | |
7096 | return true; | |
7097 | ||
7098 | req_set_fail(req); | |
7099 | req->result = -EBADF; | |
7100 | return false; | |
7101 | } | |
7102 | ||
889fca73 | 7103 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 7104 | { |
5730b27e | 7105 | const struct cred *creds = NULL; |
d625c6ee | 7106 | int ret; |
2b188cc1 | 7107 | |
6878b40e | 7108 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 7109 | creds = override_creds(req->creds); |
5730b27e | 7110 | |
5bd2182d PM |
7111 | if (!io_op_defs[req->opcode].audit_skip) |
7112 | audit_uring_entry(req->opcode); | |
6bf9c47a JA |
7113 | if (unlikely(!io_assign_file(req, issue_flags))) |
7114 | return -EBADF; | |
5bd2182d | 7115 | |
d625c6ee | 7116 | switch (req->opcode) { |
2b188cc1 | 7117 | case IORING_OP_NOP: |
889fca73 | 7118 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
7119 | break; |
7120 | case IORING_OP_READV: | |
edafccee | 7121 | case IORING_OP_READ_FIXED: |
3a6820f2 | 7122 | case IORING_OP_READ: |
889fca73 | 7123 | ret = io_read(req, issue_flags); |
edafccee | 7124 | break; |
3529d8c2 | 7125 | case IORING_OP_WRITEV: |
edafccee | 7126 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 7127 | case IORING_OP_WRITE: |
889fca73 | 7128 | ret = io_write(req, issue_flags); |
2b188cc1 | 7129 | break; |
c992fe29 | 7130 | case IORING_OP_FSYNC: |
45d189c6 | 7131 | ret = io_fsync(req, issue_flags); |
c992fe29 | 7132 | break; |
221c5eb2 | 7133 | case IORING_OP_POLL_ADD: |
61e98203 | 7134 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
7135 | break; |
7136 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 7137 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 7138 | break; |
5d17b4a4 | 7139 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 7140 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 7141 | break; |
0fa03c62 | 7142 | case IORING_OP_SENDMSG: |
889fca73 | 7143 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 7144 | break; |
fddaface | 7145 | case IORING_OP_SEND: |
889fca73 | 7146 | ret = io_send(req, issue_flags); |
0fa03c62 | 7147 | break; |
aa1fa28f | 7148 | case IORING_OP_RECVMSG: |
889fca73 | 7149 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 7150 | break; |
fddaface | 7151 | case IORING_OP_RECV: |
889fca73 | 7152 | ret = io_recv(req, issue_flags); |
aa1fa28f | 7153 | break; |
5262f567 | 7154 | case IORING_OP_TIMEOUT: |
61e98203 | 7155 | ret = io_timeout(req, issue_flags); |
5262f567 | 7156 | break; |
11365043 | 7157 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 7158 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 7159 | break; |
17f2fe35 | 7160 | case IORING_OP_ACCEPT: |
889fca73 | 7161 | ret = io_accept(req, issue_flags); |
17f2fe35 | 7162 | break; |
f8e85cf2 | 7163 | case IORING_OP_CONNECT: |
889fca73 | 7164 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 7165 | break; |
62755e35 | 7166 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 7167 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 7168 | break; |
d63d1b5e | 7169 | case IORING_OP_FALLOCATE: |
45d189c6 | 7170 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 7171 | break; |
15b71abe | 7172 | case IORING_OP_OPENAT: |
45d189c6 | 7173 | ret = io_openat(req, issue_flags); |
15b71abe | 7174 | break; |
b5dba59e | 7175 | case IORING_OP_CLOSE: |
889fca73 | 7176 | ret = io_close(req, issue_flags); |
b5dba59e | 7177 | break; |
05f3fb3c | 7178 | case IORING_OP_FILES_UPDATE: |
889fca73 | 7179 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 7180 | break; |
eddc7ef5 | 7181 | case IORING_OP_STATX: |
45d189c6 | 7182 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 7183 | break; |
4840e418 | 7184 | case IORING_OP_FADVISE: |
45d189c6 | 7185 | ret = io_fadvise(req, issue_flags); |
4840e418 | 7186 | break; |
c1ca757b | 7187 | case IORING_OP_MADVISE: |
45d189c6 | 7188 | ret = io_madvise(req, issue_flags); |
c1ca757b | 7189 | break; |
cebdb986 | 7190 | case IORING_OP_OPENAT2: |
45d189c6 | 7191 | ret = io_openat2(req, issue_flags); |
cebdb986 | 7192 | break; |
3e4827b0 | 7193 | case IORING_OP_EPOLL_CTL: |
889fca73 | 7194 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 7195 | break; |
7d67af2c | 7196 | case IORING_OP_SPLICE: |
45d189c6 | 7197 | ret = io_splice(req, issue_flags); |
7d67af2c | 7198 | break; |
ddf0322d | 7199 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 7200 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 7201 | break; |
067524e9 | 7202 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 7203 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 7204 | break; |
f2a8d5c7 | 7205 | case IORING_OP_TEE: |
45d189c6 | 7206 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 7207 | break; |
36f4fa68 | 7208 | case IORING_OP_SHUTDOWN: |
45d189c6 | 7209 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 7210 | break; |
80a261fd | 7211 | case IORING_OP_RENAMEAT: |
45d189c6 | 7212 | ret = io_renameat(req, issue_flags); |
80a261fd | 7213 | break; |
14a1143b | 7214 | case IORING_OP_UNLINKAT: |
45d189c6 | 7215 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 7216 | break; |
e34a02dc DK |
7217 | case IORING_OP_MKDIRAT: |
7218 | ret = io_mkdirat(req, issue_flags); | |
7219 | break; | |
7a8721f8 DK |
7220 | case IORING_OP_SYMLINKAT: |
7221 | ret = io_symlinkat(req, issue_flags); | |
7222 | break; | |
cf30da90 DK |
7223 | case IORING_OP_LINKAT: |
7224 | ret = io_linkat(req, issue_flags); | |
7225 | break; | |
4f57f06c JA |
7226 | case IORING_OP_MSG_RING: |
7227 | ret = io_msg_ring(req, issue_flags); | |
7228 | break; | |
2b188cc1 JA |
7229 | default: |
7230 | ret = -EINVAL; | |
7231 | break; | |
7232 | } | |
7233 | ||
5bd2182d PM |
7234 | if (!io_op_defs[req->opcode].audit_skip) |
7235 | audit_uring_exit(!ret, ret); | |
7236 | ||
5730b27e JA |
7237 | if (creds) |
7238 | revert_creds(creds); | |
def596e9 JA |
7239 | if (ret) |
7240 | return ret; | |
b532576e | 7241 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 7242 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 7243 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
7244 | |
7245 | return 0; | |
2b188cc1 JA |
7246 | } |
7247 | ||
ebc11b6c PB |
7248 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
7249 | { | |
7250 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7251 | ||
7252 | req = io_put_req_find_next(req); | |
7253 | return req ? &req->work : NULL; | |
7254 | } | |
7255 | ||
5280f7e5 | 7256 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
7257 | { |
7258 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6bf9c47a | 7259 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
d01905db PB |
7260 | unsigned int issue_flags = IO_URING_F_UNLOCKED; |
7261 | bool needs_poll = false; | |
6df1db6b | 7262 | struct io_kiocb *timeout; |
6bf9c47a | 7263 | int ret = 0, err = -ECANCELED; |
2b188cc1 | 7264 | |
48dcd38d PB |
7265 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
7266 | if (!(req->flags & REQ_F_REFCOUNT)) | |
7267 | __io_req_set_refcount(req, 2); | |
7268 | else | |
7269 | req_ref_get(req); | |
5d5901a3 | 7270 | |
6df1db6b PB |
7271 | timeout = io_prep_linked_timeout(req); |
7272 | if (timeout) | |
7273 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 7274 | |
6bf9c47a JA |
7275 | if (!io_assign_file(req, issue_flags)) { |
7276 | err = -EBADF; | |
7277 | work->flags |= IO_WQ_WORK_CANCEL; | |
7278 | } | |
7279 | ||
dadebc35 | 7280 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
d01905db | 7281 | if (work->flags & IO_WQ_WORK_CANCEL) { |
6bf9c47a | 7282 | io_req_task_queue_fail(req, err); |
d01905db PB |
7283 | return; |
7284 | } | |
31b51510 | 7285 | |
d01905db | 7286 | if (req->flags & REQ_F_FORCE_ASYNC) { |
afb7f56f PB |
7287 | bool opcode_poll = def->pollin || def->pollout; |
7288 | ||
7289 | if (opcode_poll && file_can_poll(req->file)) { | |
7290 | needs_poll = true; | |
d01905db | 7291 | issue_flags |= IO_URING_F_NONBLOCK; |
afb7f56f | 7292 | } |
561fb04a | 7293 | } |
31b51510 | 7294 | |
d01905db PB |
7295 | do { |
7296 | ret = io_issue_sqe(req, issue_flags); | |
7297 | if (ret != -EAGAIN) | |
7298 | break; | |
7299 | /* | |
7300 | * We can get EAGAIN for iopolled IO even though we're | |
7301 | * forcing a sync submission from here, since we can't | |
7302 | * wait for request slots on the block side. | |
7303 | */ | |
7304 | if (!needs_poll) { | |
7305 | cond_resched(); | |
7306 | continue; | |
90fa0288 HX |
7307 | } |
7308 | ||
4d9237e3 | 7309 | if (io_arm_poll_handler(req, issue_flags) == IO_APOLL_OK) |
d01905db PB |
7310 | return; |
7311 | /* aborted or ready, in either case retry blocking */ | |
7312 | needs_poll = false; | |
7313 | issue_flags &= ~IO_URING_F_NONBLOCK; | |
7314 | } while (1); | |
31b51510 | 7315 | |
a3df7698 | 7316 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 7317 | if (ret) |
a3df7698 | 7318 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
7319 | } |
7320 | ||
aeca241b | 7321 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 7322 | unsigned i) |
65e19f54 | 7323 | { |
042b0d85 | 7324 | return &table->files[i]; |
dafecf19 PB |
7325 | } |
7326 | ||
65e19f54 JA |
7327 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
7328 | int index) | |
7329 | { | |
aeca241b | 7330 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 7331 | |
a04b0ac0 | 7332 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
7333 | } |
7334 | ||
a04b0ac0 | 7335 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
7336 | { |
7337 | unsigned long file_ptr = (unsigned long) file; | |
7338 | ||
88459b50 | 7339 | file_ptr |= io_file_get_flags(file); |
a04b0ac0 | 7340 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
7341 | } |
7342 | ||
5106dd6e JA |
7343 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
7344 | unsigned int issue_flags) | |
09bb8394 | 7345 | { |
5106dd6e JA |
7346 | struct io_ring_ctx *ctx = req->ctx; |
7347 | struct file *file = NULL; | |
ac177053 | 7348 | unsigned long file_ptr; |
09bb8394 | 7349 | |
5106dd6e JA |
7350 | if (issue_flags & IO_URING_F_UNLOCKED) |
7351 | mutex_lock(&ctx->uring_lock); | |
7352 | ||
ac177053 | 7353 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
5106dd6e | 7354 | goto out; |
ac177053 PB |
7355 | fd = array_index_nospec(fd, ctx->nr_user_files); |
7356 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
7357 | file = (struct file *) (file_ptr & FFS_MASK); | |
7358 | file_ptr &= ~FFS_MASK; | |
7359 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 7360 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
5106dd6e JA |
7361 | io_req_set_rsrc_node(req, ctx, 0); |
7362 | out: | |
7363 | if (issue_flags & IO_URING_F_UNLOCKED) | |
7364 | mutex_unlock(&ctx->uring_lock); | |
ac177053 PB |
7365 | return file; |
7366 | } | |
d44f554e | 7367 | |
d5361233 JA |
7368 | /* |
7369 | * Drop the file for requeue operations. Only used of req->file is the | |
7370 | * io_uring descriptor itself. | |
7371 | */ | |
7372 | static void io_drop_inflight_file(struct io_kiocb *req) | |
7373 | { | |
7374 | if (unlikely(req->flags & REQ_F_INFLIGHT)) { | |
7375 | fput(req->file); | |
7376 | req->file = NULL; | |
7377 | req->flags &= ~REQ_F_INFLIGHT; | |
7378 | } | |
7379 | } | |
7380 | ||
5106dd6e | 7381 | static struct file *io_file_get_normal(struct io_kiocb *req, int fd) |
ac177053 | 7382 | { |
62906e89 | 7383 | struct file *file = fget(fd); |
ac177053 | 7384 | |
5106dd6e | 7385 | trace_io_uring_file_get(req->ctx, req, req->user_data, fd); |
09bb8394 | 7386 | |
ac177053 | 7387 | /* we don't allow fixed io_uring files */ |
d5361233 JA |
7388 | if (file && file->f_op == &io_uring_fops) |
7389 | req->flags |= REQ_F_INFLIGHT; | |
8371adf5 | 7390 | return file; |
09bb8394 JA |
7391 | } |
7392 | ||
f237c30a | 7393 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
7394 | { |
7395 | struct io_kiocb *prev = req->timeout.prev; | |
617a8948 | 7396 | int ret = -ENOENT; |
89b263f6 JA |
7397 | |
7398 | if (prev) { | |
617a8948 PB |
7399 | if (!(req->task->flags & PF_EXITING)) |
7400 | ret = io_try_cancel_userdata(req, prev->user_data); | |
505657bc | 7401 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 7402 | io_put_req(prev); |
89b263f6 JA |
7403 | } else { |
7404 | io_req_complete_post(req, -ETIME, 0); | |
7405 | } | |
7406 | } | |
7407 | ||
2665abfd | 7408 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 7409 | { |
ad8a48ac JA |
7410 | struct io_timeout_data *data = container_of(timer, |
7411 | struct io_timeout_data, timer); | |
90cd7e42 | 7412 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 7413 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 7414 | unsigned long flags; |
2665abfd | 7415 | |
89b263f6 | 7416 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
7417 | prev = req->timeout.head; |
7418 | req->timeout.head = NULL; | |
2665abfd JA |
7419 | |
7420 | /* | |
7421 | * We don't expect the list to be empty, that will only happen if we | |
7422 | * race with the completion of the linked work. | |
7423 | */ | |
447c19f3 | 7424 | if (prev) { |
f2f87370 | 7425 | io_remove_next_linked(prev); |
447c19f3 PB |
7426 | if (!req_ref_inc_not_zero(prev)) |
7427 | prev = NULL; | |
7428 | } | |
ef9dd637 | 7429 | list_del(&req->timeout.list); |
89b263f6 JA |
7430 | req->timeout.prev = prev; |
7431 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 7432 | |
89b263f6 | 7433 | req->io_task_work.func = io_req_task_link_timeout; |
4813c377 | 7434 | io_req_task_work_add(req, false); |
2665abfd JA |
7435 | return HRTIMER_NORESTART; |
7436 | } | |
7437 | ||
de968c18 | 7438 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 7439 | { |
de968c18 PB |
7440 | struct io_ring_ctx *ctx = req->ctx; |
7441 | ||
89b263f6 | 7442 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 7443 | /* |
f2f87370 PB |
7444 | * If the back reference is NULL, then our linked request finished |
7445 | * before we got a chance to setup the timer | |
76a46e06 | 7446 | */ |
90cd7e42 | 7447 | if (req->timeout.head) { |
e8c2bc1f | 7448 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 7449 | |
ad8a48ac JA |
7450 | data->timer.function = io_link_timeout_fn; |
7451 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
7452 | data->mode); | |
ef9dd637 | 7453 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 7454 | } |
89b263f6 | 7455 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 7456 | /* drop submission reference */ |
76a46e06 JA |
7457 | io_put_req(req); |
7458 | } | |
2665abfd | 7459 | |
d475a9a6 PB |
7460 | static void io_queue_sqe_arm_apoll(struct io_kiocb *req) |
7461 | __must_hold(&req->ctx->uring_lock) | |
7462 | { | |
7463 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); | |
7464 | ||
4d9237e3 | 7465 | switch (io_arm_poll_handler(req, 0)) { |
d475a9a6 | 7466 | case IO_APOLL_READY: |
d475a9a6 PB |
7467 | io_req_task_queue(req); |
7468 | break; | |
7469 | case IO_APOLL_ABORTED: | |
7470 | /* | |
7471 | * Queued up for async execution, worker will release | |
7472 | * submit reference when the iocb is actually submitted. | |
7473 | */ | |
7474 | io_queue_async_work(req, NULL); | |
7475 | break; | |
b1c62645 | 7476 | case IO_APOLL_OK: |
b1c62645 | 7477 | break; |
d475a9a6 PB |
7478 | } |
7479 | ||
7480 | if (linked_timeout) | |
7481 | io_queue_linked_timeout(linked_timeout); | |
7482 | } | |
7483 | ||
7484 | static inline void __io_queue_sqe(struct io_kiocb *req) | |
282cdc86 | 7485 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 7486 | { |
906c6caa | 7487 | struct io_kiocb *linked_timeout; |
e0c5c576 | 7488 | int ret; |
2b188cc1 | 7489 | |
c5eef2b9 | 7490 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 7491 | |
fff4e40e PB |
7492 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
7493 | io_req_add_compl_list(req); | |
d9f9d284 | 7494 | return; |
fff4e40e | 7495 | } |
491381ce JA |
7496 | /* |
7497 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
7498 | * doesn't support non-blocking read/write attempts | |
7499 | */ | |
1840038e | 7500 | if (likely(!ret)) { |
906c6caa PB |
7501 | linked_timeout = io_prep_linked_timeout(req); |
7502 | if (linked_timeout) | |
7503 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 7504 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d475a9a6 | 7505 | io_queue_sqe_arm_apoll(req); |
0d63c148 | 7506 | } else { |
f41db273 | 7507 | io_req_complete_failed(req, ret); |
9e645e11 | 7508 | } |
2b188cc1 JA |
7509 | } |
7510 | ||
4652fe3f | 7511 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 7512 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 7513 | { |
4652fe3f | 7514 | if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 7515 | io_req_complete_fail_submit(req); |
e0eb71dc PB |
7516 | } else if (unlikely(req->ctx->drain_active)) { |
7517 | io_drain_req(req); | |
76cc33d7 PB |
7518 | } else { |
7519 | int ret = io_req_prep_async(req); | |
7520 | ||
7521 | if (unlikely(ret)) | |
7522 | io_req_complete_failed(req, ret); | |
7523 | else | |
f237c30a | 7524 | io_queue_async_work(req, NULL); |
ce35a47a | 7525 | } |
4fe2c963 JL |
7526 | } |
7527 | ||
4652fe3f PB |
7528 | static inline void io_queue_sqe(struct io_kiocb *req) |
7529 | __must_hold(&req->ctx->uring_lock) | |
7530 | { | |
7531 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) | |
7532 | __io_queue_sqe(req); | |
7533 | else | |
7534 | io_queue_sqe_fallback(req); | |
7535 | } | |
7536 | ||
b16fed66 PB |
7537 | /* |
7538 | * Check SQE restrictions (opcode and flags). | |
7539 | * | |
7540 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
7541 | */ | |
7542 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
7543 | struct io_kiocb *req, | |
7544 | unsigned int sqe_flags) | |
4fe2c963 | 7545 | { |
b16fed66 PB |
7546 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
7547 | return false; | |
7548 | ||
7549 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
7550 | ctx->restrictions.sqe_flags_required) | |
7551 | return false; | |
7552 | ||
7553 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
7554 | ctx->restrictions.sqe_flags_required)) | |
7555 | return false; | |
7556 | ||
7557 | return true; | |
4fe2c963 JL |
7558 | } |
7559 | ||
22b2ca31 PB |
7560 | static void io_init_req_drain(struct io_kiocb *req) |
7561 | { | |
7562 | struct io_ring_ctx *ctx = req->ctx; | |
7563 | struct io_kiocb *head = ctx->submit_state.link.head; | |
7564 | ||
7565 | ctx->drain_active = true; | |
7566 | if (head) { | |
7567 | /* | |
7568 | * If we need to drain a request in the middle of a link, drain | |
7569 | * the head request and the next request/link after the current | |
7570 | * link. Considering sequential execution of links, | |
b6c7db32 | 7571 | * REQ_F_IO_DRAIN will be maintained for every request of our |
22b2ca31 PB |
7572 | * link. |
7573 | */ | |
b6c7db32 | 7574 | head->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
22b2ca31 PB |
7575 | ctx->drain_next = true; |
7576 | } | |
7577 | } | |
7578 | ||
b16fed66 PB |
7579 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7580 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7581 | __must_hold(&ctx->uring_lock) |
b16fed66 | 7582 | { |
b16fed66 | 7583 | unsigned int sqe_flags; |
fc0ae024 | 7584 | int personality; |
4a04d1d1 | 7585 | u8 opcode; |
b16fed66 | 7586 | |
864ea921 | 7587 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 7588 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
7589 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
7590 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7591 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7592 | req->file = NULL; |
b16fed66 | 7593 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7594 | req->task = current; |
b16fed66 | 7595 | |
4a04d1d1 PB |
7596 | if (unlikely(opcode >= IORING_OP_LAST)) { |
7597 | req->opcode = 0; | |
b16fed66 | 7598 | return -EINVAL; |
4a04d1d1 | 7599 | } |
68fe256a PB |
7600 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
7601 | /* enforce forwards compatibility on users */ | |
7602 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
7603 | return -EINVAL; | |
7604 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
4a04d1d1 | 7605 | !io_op_defs[opcode].buffer_select) |
68fe256a | 7606 | return -EOPNOTSUPP; |
5562a8d7 PB |
7607 | if (sqe_flags & IOSQE_CQE_SKIP_SUCCESS) |
7608 | ctx->drain_disabled = true; | |
7609 | if (sqe_flags & IOSQE_IO_DRAIN) { | |
7610 | if (ctx->drain_disabled) | |
7611 | return -EOPNOTSUPP; | |
22b2ca31 | 7612 | io_init_req_drain(req); |
5562a8d7 | 7613 | } |
2a56a9bd PB |
7614 | } |
7615 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
7616 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
7617 | return -EACCES; | |
7618 | /* knock it to the slow queue path, will be drained there */ | |
7619 | if (ctx->drain_active) | |
7620 | req->flags |= REQ_F_FORCE_ASYNC; | |
7621 | /* if there is no link, we're at "next" request and need to drain */ | |
7622 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
7623 | ctx->drain_next = false; | |
7624 | ctx->drain_active = true; | |
b6c7db32 | 7625 | req->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 7626 | } |
68fe256a | 7627 | } |
b16fed66 | 7628 | |
4a04d1d1 | 7629 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
7630 | struct io_submit_state *state = &ctx->submit_state; |
7631 | ||
6bf9c47a JA |
7632 | req->work.fd = READ_ONCE(sqe->fd); |
7633 | ||
6d63416d PB |
7634 | /* |
7635 | * Plug now if we have more than 2 IO left after this, and the | |
7636 | * target is potentially a read/write to block based storage. | |
7637 | */ | |
4a04d1d1 | 7638 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
7639 | state->plug_started = true; |
7640 | state->need_plug = false; | |
5ca7a8b3 | 7641 | blk_start_plug_nr_ios(&state->plug, state->submit_nr); |
6d63416d | 7642 | } |
b16fed66 | 7643 | } |
863e0560 | 7644 | |
003e8dcc JA |
7645 | personality = READ_ONCE(sqe->personality); |
7646 | if (personality) { | |
cdab10bf LT |
7647 | int ret; |
7648 | ||
c10d1f98 PB |
7649 | req->creds = xa_load(&ctx->personalities, personality); |
7650 | if (!req->creds) | |
003e8dcc | 7651 | return -EINVAL; |
c10d1f98 | 7652 | get_cred(req->creds); |
cdc1404a PM |
7653 | ret = security_uring_override_creds(req->creds); |
7654 | if (ret) { | |
7655 | put_cred(req->creds); | |
7656 | return ret; | |
7657 | } | |
b8e64b53 | 7658 | req->flags |= REQ_F_CREDS; |
003e8dcc | 7659 | } |
b16fed66 | 7660 | |
fc0ae024 | 7661 | return io_req_prep(req, sqe); |
b16fed66 PB |
7662 | } |
7663 | ||
a6b8cadc | 7664 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7665 | const struct io_uring_sqe *sqe) |
282cdc86 | 7666 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7667 | { |
a1ab7b35 | 7668 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7669 | int ret; |
9e645e11 | 7670 | |
a6b8cadc PB |
7671 | ret = io_init_req(ctx, req, sqe); |
7672 | if (unlikely(ret)) { | |
502c87d6 | 7673 | trace_io_uring_req_failed(sqe, ctx, req, ret); |
a87acfde | 7674 | |
a8295b98 | 7675 | /* fail even hard links since we don't submit */ |
de59bc10 | 7676 | if (link->head) { |
a8295b98 HX |
7677 | /* |
7678 | * we can judge a link req is failed or cancelled by if | |
7679 | * REQ_F_FAIL is set, but the head is an exception since | |
7680 | * it may be set REQ_F_FAIL because of other req's failure | |
7681 | * so let's leverage req->result to distinguish if a head | |
7682 | * is set REQ_F_FAIL because of its failure or other req's | |
7683 | * failure so that we can set the correct ret code for it. | |
7684 | * init result here to avoid affecting the normal path. | |
7685 | */ | |
7686 | if (!(link->head->flags & REQ_F_FAIL)) | |
7687 | req_fail_link_node(link->head, -ECANCELED); | |
7688 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7689 | /* | |
7690 | * the current req is a normal req, we should return | |
7691 | * error and thus break the submittion loop. | |
7692 | */ | |
7693 | io_req_complete_failed(req, ret); | |
7694 | return ret; | |
de59bc10 | 7695 | } |
a8295b98 | 7696 | req_fail_link_node(req, ret); |
a6b8cadc | 7697 | } |
441b8a78 | 7698 | |
be7053b7 | 7699 | /* don't need @sqe from now on */ |
502c87d6 | 7700 | trace_io_uring_submit_sqe(ctx, req, req->user_data, req->opcode, |
236daeae OL |
7701 | req->flags, true, |
7702 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7703 | |
9e645e11 JA |
7704 | /* |
7705 | * If we already have a head request, queue this one for async | |
7706 | * submittal once the head completes. If we don't have a head but | |
7707 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7708 | * submitted sync once the chain is complete. If none of those | |
7709 | * conditions are true (normal request), then just queue it. | |
7710 | */ | |
863e0560 PB |
7711 | if (link->head) { |
7712 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7713 | |
a8295b98 HX |
7714 | if (!(req->flags & REQ_F_FAIL)) { |
7715 | ret = io_req_prep_async(req); | |
7716 | if (unlikely(ret)) { | |
7717 | req_fail_link_node(req, ret); | |
7718 | if (!(head->flags & REQ_F_FAIL)) | |
7719 | req_fail_link_node(head, -ECANCELED); | |
7720 | } | |
7721 | } | |
9d76377f | 7722 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7723 | link->last->link = req; |
863e0560 | 7724 | link->last = req; |
32fe525b | 7725 | |
f15a3431 PB |
7726 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) |
7727 | return 0; | |
32fe525b | 7728 | /* last request of a link, enqueue the link */ |
f15a3431 PB |
7729 | link->head = NULL; |
7730 | req = head; | |
7731 | } else if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { | |
7732 | link->head = req; | |
7733 | link->last = req; | |
7734 | return 0; | |
9e645e11 | 7735 | } |
2e6e1fde | 7736 | |
f15a3431 | 7737 | io_queue_sqe(req); |
1d4240cc | 7738 | return 0; |
9e645e11 JA |
7739 | } |
7740 | ||
9a56a232 JA |
7741 | /* |
7742 | * Batched submission is done, ensure local IO is flushed out. | |
7743 | */ | |
553deffd | 7744 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 7745 | { |
553deffd PB |
7746 | struct io_submit_state *state = &ctx->submit_state; |
7747 | ||
a1ab7b35 | 7748 | if (state->link.head) |
de59bc10 | 7749 | io_queue_sqe(state->link.head); |
553deffd | 7750 | /* flush only after queuing links as they can generate completions */ |
c450178d | 7751 | io_submit_flush_completions(ctx); |
27926b68 JA |
7752 | if (state->plug_started) |
7753 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7754 | } |
7755 | ||
7756 | /* | |
7757 | * Start submission side cache. | |
7758 | */ | |
7759 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7760 | unsigned int max_ios) |
9a56a232 | 7761 | { |
27926b68 | 7762 | state->plug_started = false; |
4b628aeb | 7763 | state->need_plug = max_ios > 2; |
5ca7a8b3 | 7764 | state->submit_nr = max_ios; |
a1ab7b35 PB |
7765 | /* set only head, no need to init link_last in advance */ |
7766 | state->link.head = NULL; | |
9a56a232 JA |
7767 | } |
7768 | ||
2b188cc1 JA |
7769 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7770 | { | |
75b28aff | 7771 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7772 | |
caf582c6 PB |
7773 | /* |
7774 | * Ensure any loads from the SQEs are done at this point, | |
7775 | * since once we write the new head, the application could | |
7776 | * write new data to them. | |
7777 | */ | |
7778 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7779 | } |
7780 | ||
2b188cc1 | 7781 | /* |
dd9ae8a0 | 7782 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7783 | * that is mapped by userspace. This means that care needs to be taken to |
7784 | * ensure that reads are stable, as we cannot rely on userspace always | |
7785 | * being a good citizen. If members of the sqe are validated and then later | |
7786 | * used, it's important that those reads are done through READ_ONCE() to | |
7787 | * prevent a re-load down the line. | |
7788 | */ | |
709b302f | 7789 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7790 | { |
ea5ab3b5 | 7791 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7792 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7793 | |
7794 | /* | |
7795 | * The cached sq head (or cq tail) serves two purposes: | |
7796 | * | |
7797 | * 1) allows us to batch the cost of updating the user visible | |
7798 | * head updates. | |
7799 | * 2) allows the kernel side to track the head on its own, even | |
7800 | * though the application is the one updating it. | |
7801 | */ | |
17d3aeb3 | 7802 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7803 | if (likely(head < ctx->sq_entries)) |
7804 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7805 | |
7806 | /* drop invalid entries */ | |
15641e42 PB |
7807 | ctx->cq_extra--; |
7808 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7809 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7810 | return NULL; |
7811 | } | |
7812 | ||
0f212204 | 7813 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7814 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7815 | { |
69629809 | 7816 | unsigned int entries = io_sqring_entries(ctx); |
46c4e16a | 7817 | int submitted = 0; |
6c271ce2 | 7818 | |
51d48dab | 7819 | if (unlikely(!entries)) |
69629809 | 7820 | return 0; |
ee7d46d9 | 7821 | /* make sure SQ entry isn't read before tail */ |
69629809 | 7822 | nr = min3(nr, ctx->sq_entries, entries); |
9a10867a | 7823 | io_get_task_refs(nr); |
6c271ce2 | 7824 | |
ba88ff11 | 7825 | io_submit_state_start(&ctx->submit_state, nr); |
69629809 | 7826 | do { |
3529d8c2 | 7827 | const struct io_uring_sqe *sqe; |
196be95c | 7828 | struct io_kiocb *req; |
fb5ccc98 | 7829 | |
a33ae9ce | 7830 | if (unlikely(!io_alloc_req_refill(ctx))) { |
196be95c PB |
7831 | if (!submitted) |
7832 | submitted = -EAGAIN; | |
fb5ccc98 | 7833 | break; |
196be95c | 7834 | } |
a33ae9ce | 7835 | req = io_alloc_req(ctx); |
4fccfcbb PB |
7836 | sqe = io_get_sqe(ctx); |
7837 | if (unlikely(!sqe)) { | |
c2b6c6bc | 7838 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
4fccfcbb PB |
7839 | break; |
7840 | } | |
d3656344 JA |
7841 | /* will complete beyond this point, count as submitted */ |
7842 | submitted++; | |
bcbb7bf6 JA |
7843 | if (io_submit_sqe(ctx, req, sqe)) { |
7844 | /* | |
7845 | * Continue submitting even for sqe failure if the | |
7846 | * ring was setup with IORING_SETUP_SUBMIT_ALL | |
7847 | */ | |
7848 | if (!(ctx->flags & IORING_SETUP_SUBMIT_ALL)) | |
7849 | break; | |
7850 | } | |
69629809 | 7851 | } while (submitted < nr); |
6c271ce2 | 7852 | |
9466f437 PB |
7853 | if (unlikely(submitted != nr)) { |
7854 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7855 | int unused = nr - ref_used; |
9466f437 | 7856 | |
09899b19 | 7857 | current->io_uring->cached_refs += unused; |
9466f437 | 7858 | } |
6c271ce2 | 7859 | |
553deffd | 7860 | io_submit_state_end(ctx); |
ae9428ca PB |
7861 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7862 | io_commit_sqring(ctx); | |
7863 | ||
6c271ce2 JA |
7864 | return submitted; |
7865 | } | |
7866 | ||
e4b6d902 PB |
7867 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7868 | { | |
7869 | return READ_ONCE(sqd->state); | |
7870 | } | |
7871 | ||
23b3628e XW |
7872 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7873 | { | |
7874 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7875 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7876 | WRITE_ONCE(ctx->rings->sq_flags, |
7877 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7878 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7879 | } |
7880 | ||
7881 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7882 | { | |
79ebeaee | 7883 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7884 | WRITE_ONCE(ctx->rings->sq_flags, |
7885 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7886 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7887 | } |
7888 | ||
08369246 | 7889 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7890 | { |
c8d1ba58 | 7891 | unsigned int to_submit; |
bdcd3eab | 7892 | int ret = 0; |
6c271ce2 | 7893 | |
c8d1ba58 | 7894 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7895 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7896 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7897 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7898 | |
5eef4e87 | 7899 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
7900 | const struct cred *creds = NULL; |
7901 | ||
7902 | if (ctx->sq_creds != current_cred()) | |
7903 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7904 | |
c8d1ba58 | 7905 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 7906 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 7907 | io_do_iopoll(ctx, true); |
906a3c6f | 7908 | |
3b763ba1 PB |
7909 | /* |
7910 | * Don't submit if refs are dying, good for io_uring_register(), | |
7911 | * but also it is relied upon by io_ring_exit_work() | |
7912 | */ | |
0298ef96 PB |
7913 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7914 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7915 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7916 | mutex_unlock(&ctx->uring_lock); |
cb318216 | 7917 | |
acfb381d PB |
7918 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7919 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7920 | if (creds) |
7921 | revert_creds(creds); | |
acfb381d | 7922 | } |
6c271ce2 | 7923 | |
08369246 XW |
7924 | return ret; |
7925 | } | |
6c271ce2 | 7926 | |
c072481d | 7927 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
7928 | { |
7929 | struct io_ring_ctx *ctx; | |
7930 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7931 | |
c9dca27d PB |
7932 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7933 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7934 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7935 | } |
6c271ce2 | 7936 | |
e4b6d902 PB |
7937 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7938 | { | |
7939 | bool did_sig = false; | |
7940 | struct ksignal ksig; | |
7941 | ||
7942 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7943 | signal_pending(current)) { | |
7944 | mutex_unlock(&sqd->lock); | |
7945 | if (signal_pending(current)) | |
7946 | did_sig = get_signal(&ksig); | |
7947 | cond_resched(); | |
7948 | mutex_lock(&sqd->lock); | |
7949 | } | |
e4b6d902 PB |
7950 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7951 | } | |
7952 | ||
c8d1ba58 JA |
7953 | static int io_sq_thread(void *data) |
7954 | { | |
69fb2131 JA |
7955 | struct io_sq_data *sqd = data; |
7956 | struct io_ring_ctx *ctx; | |
a0d9205f | 7957 | unsigned long timeout = 0; |
37d1e2e3 | 7958 | char buf[TASK_COMM_LEN]; |
08369246 | 7959 | DEFINE_WAIT(wait); |
6c271ce2 | 7960 | |
696ee88a | 7961 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7962 | set_task_comm(current, buf); |
37d1e2e3 JA |
7963 | |
7964 | if (sqd->sq_cpu != -1) | |
7965 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7966 | else | |
7967 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7968 | current->flags |= PF_NO_SETAFFINITY; | |
7969 | ||
5bd2182d PM |
7970 | audit_alloc_kernel(current); |
7971 | ||
09a6f4ef | 7972 | mutex_lock(&sqd->lock); |
e4b6d902 | 7973 | while (1) { |
1a924a80 | 7974 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7975 | |
e4b6d902 PB |
7976 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7977 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7978 | break; |
08369246 XW |
7979 | timeout = jiffies + sqd->sq_thread_idle; |
7980 | } | |
e4b6d902 | 7981 | |
e95eee2d | 7982 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7983 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7984 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7985 | |
5eef4e87 | 7986 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 7987 | sqt_spin = true; |
69fb2131 | 7988 | } |
dd432ea5 PB |
7989 | if (io_run_task_work()) |
7990 | sqt_spin = true; | |
6c271ce2 | 7991 | |
08369246 | 7992 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7993 | cond_resched(); |
08369246 XW |
7994 | if (sqt_spin) |
7995 | timeout = jiffies + sqd->sq_thread_idle; | |
7996 | continue; | |
7997 | } | |
7998 | ||
08369246 | 7999 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
7f62d40d | 8000 | if (!io_sqd_events_pending(sqd) && !task_work_pending(current)) { |
1a924a80 PB |
8001 | bool needs_sched = true; |
8002 | ||
724cb4f9 | 8003 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
8004 | io_ring_set_wakeup_flag(ctx); |
8005 | ||
724cb4f9 | 8006 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 8007 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
8008 | needs_sched = false; |
8009 | break; | |
8010 | } | |
649bb75d AK |
8011 | |
8012 | /* | |
8013 | * Ensure the store of the wakeup flag is not | |
8014 | * reordered with the load of the SQ tail | |
8015 | */ | |
8016 | smp_mb(); | |
8017 | ||
724cb4f9 HX |
8018 | if (io_sqring_entries(ctx)) { |
8019 | needs_sched = false; | |
8020 | break; | |
8021 | } | |
8022 | } | |
8023 | ||
8024 | if (needs_sched) { | |
8025 | mutex_unlock(&sqd->lock); | |
8026 | schedule(); | |
8027 | mutex_lock(&sqd->lock); | |
8028 | } | |
69fb2131 JA |
8029 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
8030 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 8031 | } |
08369246 XW |
8032 | |
8033 | finish_wait(&sqd->wait, &wait); | |
8034 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 8035 | } |
28cea78a | 8036 | |
78cc687b | 8037 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 8038 | sqd->thread = NULL; |
05962f95 | 8039 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 8040 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 8041 | io_run_task_work(); |
734551df PB |
8042 | mutex_unlock(&sqd->lock); |
8043 | ||
5bd2182d PM |
8044 | audit_free(current); |
8045 | ||
37d1e2e3 JA |
8046 | complete(&sqd->exited); |
8047 | do_exit(0); | |
6c271ce2 JA |
8048 | } |
8049 | ||
bda52162 JA |
8050 | struct io_wait_queue { |
8051 | struct wait_queue_entry wq; | |
8052 | struct io_ring_ctx *ctx; | |
5fd46178 | 8053 | unsigned cq_tail; |
bda52162 JA |
8054 | unsigned nr_timeouts; |
8055 | }; | |
8056 | ||
6c503150 | 8057 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
8058 | { |
8059 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 8060 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
8061 | |
8062 | /* | |
d195a66e | 8063 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
8064 | * started waiting. For timeouts, we always want to return to userspace, |
8065 | * regardless of event count. | |
8066 | */ | |
5fd46178 | 8067 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
8068 | } |
8069 | ||
8070 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
8071 | int wake_flags, void *key) | |
8072 | { | |
8073 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
8074 | wq); | |
8075 | ||
6c503150 PB |
8076 | /* |
8077 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
8078 | * the task, and the next invocation will do it. | |
8079 | */ | |
5ed7a37d | 8080 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
8081 | return autoremove_wake_function(curr, mode, wake_flags, key); |
8082 | return -1; | |
bda52162 JA |
8083 | } |
8084 | ||
af9c1a44 JA |
8085 | static int io_run_task_work_sig(void) |
8086 | { | |
8087 | if (io_run_task_work()) | |
8088 | return 1; | |
0b8cfa97 | 8089 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 8090 | return -ERESTARTSYS; |
c5020bc8 OL |
8091 | if (task_sigpending(current)) |
8092 | return -EINTR; | |
8093 | return 0; | |
af9c1a44 JA |
8094 | } |
8095 | ||
eeb60b9a PB |
8096 | /* when returns >0, the caller should retry */ |
8097 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
8098 | struct io_wait_queue *iowq, | |
22833966 | 8099 | ktime_t timeout) |
eeb60b9a PB |
8100 | { |
8101 | int ret; | |
8102 | ||
8103 | /* make sure we run task_work before checking for signals */ | |
8104 | ret = io_run_task_work_sig(); | |
8105 | if (ret || io_should_wake(iowq)) | |
8106 | return ret; | |
8107 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 8108 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
8109 | return 1; |
8110 | ||
22833966 JA |
8111 | if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS)) |
8112 | return -ETIME; | |
8113 | return 1; | |
eeb60b9a PB |
8114 | } |
8115 | ||
2b188cc1 JA |
8116 | /* |
8117 | * Wait until events become available, if we don't already have some. The | |
8118 | * application must reap them itself, as they reside on the shared cq ring. | |
8119 | */ | |
8120 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
8121 | const sigset_t __user *sig, size_t sigsz, |
8122 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 8123 | { |
90291099 | 8124 | struct io_wait_queue iowq; |
75b28aff | 8125 | struct io_rings *rings = ctx->rings; |
22833966 | 8126 | ktime_t timeout = KTIME_MAX; |
c1d5a224 | 8127 | int ret; |
2b188cc1 | 8128 | |
b41e9852 | 8129 | do { |
90f67366 | 8130 | io_cqring_overflow_flush(ctx); |
6c503150 | 8131 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 8132 | return 0; |
4c6e277c | 8133 | if (!io_run_task_work()) |
b41e9852 | 8134 | break; |
b41e9852 | 8135 | } while (1); |
2b188cc1 JA |
8136 | |
8137 | if (sig) { | |
9e75ad5d AB |
8138 | #ifdef CONFIG_COMPAT |
8139 | if (in_compat_syscall()) | |
8140 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 8141 | sigsz); |
9e75ad5d AB |
8142 | else |
8143 | #endif | |
b772434b | 8144 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 8145 | |
2b188cc1 JA |
8146 | if (ret) |
8147 | return ret; | |
8148 | } | |
8149 | ||
950e79dd OL |
8150 | if (uts) { |
8151 | struct timespec64 ts; | |
8152 | ||
8153 | if (get_timespec64(&ts, uts)) | |
8154 | return -EFAULT; | |
8155 | timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns()); | |
8156 | } | |
8157 | ||
90291099 PB |
8158 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
8159 | iowq.wq.private = current; | |
8160 | INIT_LIST_HEAD(&iowq.wq.entry); | |
8161 | iowq.ctx = ctx; | |
bda52162 | 8162 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 8163 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 8164 | |
c826bd7a | 8165 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 8166 | do { |
ca0a2651 | 8167 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 8168 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
8169 | ret = -EBUSY; |
8170 | break; | |
8171 | } | |
311997b3 | 8172 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 8173 | TASK_INTERRUPTIBLE); |
22833966 | 8174 | ret = io_cqring_wait_schedule(ctx, &iowq, timeout); |
311997b3 | 8175 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 8176 | cond_resched(); |
eeb60b9a | 8177 | } while (ret > 0); |
bda52162 | 8178 | |
b7db41c9 | 8179 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 8180 | |
75b28aff | 8181 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
8182 | } |
8183 | ||
9123c8ff | 8184 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 8185 | { |
9123c8ff | 8186 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 8187 | |
846a4ef2 | 8188 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
8189 | kfree(table[i]); |
8190 | kfree(table); | |
8191 | } | |
8192 | ||
c072481d | 8193 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
8194 | { |
8195 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
8196 | size_t init_size = size; | |
8197 | void **table; | |
8198 | ||
0bea96f5 | 8199 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
8200 | if (!table) |
8201 | return NULL; | |
8202 | ||
8203 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 8204 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 8205 | |
0bea96f5 | 8206 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
8207 | if (!table[i]) { |
8208 | io_free_page_table(table, init_size); | |
8209 | return NULL; | |
8210 | } | |
8211 | size -= this_size; | |
8212 | } | |
8213 | return table; | |
05f3fb3c JA |
8214 | } |
8215 | ||
28a9fe25 | 8216 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 8217 | { |
28a9fe25 PB |
8218 | percpu_ref_exit(&ref_node->refs); |
8219 | kfree(ref_node); | |
1642b445 PB |
8220 | } |
8221 | ||
c072481d | 8222 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
8223 | { |
8224 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
8225 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
8226 | unsigned long flags; | |
8227 | bool first_add = false; | |
b36a2050 | 8228 | unsigned long delay = HZ; |
b9bd2bea PB |
8229 | |
8230 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
8231 | node->done = true; | |
8232 | ||
b36a2050 DY |
8233 | /* if we are mid-quiesce then do not delay */ |
8234 | if (node->rsrc_data->quiesce) | |
8235 | delay = 0; | |
8236 | ||
b9bd2bea PB |
8237 | while (!list_empty(&ctx->rsrc_ref_list)) { |
8238 | node = list_first_entry(&ctx->rsrc_ref_list, | |
8239 | struct io_rsrc_node, node); | |
8240 | /* recycle ref nodes in order */ | |
8241 | if (!node->done) | |
8242 | break; | |
8243 | list_del(&node->node); | |
8244 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
8245 | } | |
8246 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
8247 | ||
8248 | if (first_add) | |
b36a2050 | 8249 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
b9bd2bea PB |
8250 | } |
8251 | ||
f6133fbd | 8252 | static struct io_rsrc_node *io_rsrc_node_alloc(void) |
b9bd2bea PB |
8253 | { |
8254 | struct io_rsrc_node *ref_node; | |
8255 | ||
8256 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
8257 | if (!ref_node) | |
8258 | return NULL; | |
8259 | ||
8260 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
8261 | 0, GFP_KERNEL)) { | |
8262 | kfree(ref_node); | |
8263 | return NULL; | |
8264 | } | |
8265 | INIT_LIST_HEAD(&ref_node->node); | |
8266 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
8267 | ref_node->done = false; | |
8268 | return ref_node; | |
8269 | } | |
8270 | ||
a7f0ed5a PB |
8271 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
8272 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 8273 | __must_hold(&ctx->uring_lock) |
6b06314c | 8274 | { |
a7f0ed5a PB |
8275 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
8276 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 8277 | |
ab409402 PB |
8278 | io_rsrc_refs_drop(ctx); |
8279 | ||
a7f0ed5a PB |
8280 | if (data_to_kill) { |
8281 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 8282 | |
a7f0ed5a | 8283 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 8284 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 8285 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 8286 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 8287 | |
3e942498 | 8288 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
8289 | percpu_ref_kill(&rsrc_node->refs); |
8290 | ctx->rsrc_node = NULL; | |
8291 | } | |
6b06314c | 8292 | |
a7f0ed5a PB |
8293 | if (!ctx->rsrc_node) { |
8294 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
8295 | ctx->rsrc_backup_node = NULL; | |
8296 | } | |
8bad28d8 HX |
8297 | } |
8298 | ||
a7f0ed5a | 8299 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
8300 | { |
8301 | if (ctx->rsrc_backup_node) | |
8302 | return 0; | |
f6133fbd | 8303 | ctx->rsrc_backup_node = io_rsrc_node_alloc(); |
8dd03afe | 8304 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
8305 | } |
8306 | ||
c072481d PB |
8307 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
8308 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
8309 | { |
8310 | int ret; | |
05589553 | 8311 | |
215c3902 | 8312 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
8313 | if (data->quiesce) |
8314 | return -ENXIO; | |
05589553 | 8315 | |
8bad28d8 | 8316 | data->quiesce = true; |
1ffc5422 | 8317 | do { |
a7f0ed5a | 8318 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 8319 | if (ret) |
f2303b1f | 8320 | break; |
a7f0ed5a | 8321 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 8322 | |
3e942498 PB |
8323 | /* kill initial ref, already quiesced if zero */ |
8324 | if (atomic_dec_and_test(&data->refs)) | |
8325 | break; | |
c018db4a | 8326 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 8327 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 8328 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
8329 | if (!ret) { |
8330 | mutex_lock(&ctx->uring_lock); | |
80912cef DY |
8331 | if (atomic_read(&data->refs) > 0) { |
8332 | /* | |
8333 | * it has been revived by another thread while | |
8334 | * we were unlocked | |
8335 | */ | |
8336 | mutex_unlock(&ctx->uring_lock); | |
8337 | } else { | |
8338 | break; | |
8339 | } | |
c018db4a | 8340 | } |
8bad28d8 | 8341 | |
3e942498 PB |
8342 | atomic_inc(&data->refs); |
8343 | /* wait for all works potentially completing data->done */ | |
8344 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 8345 | reinit_completion(&data->done); |
8dd03afe | 8346 | |
1ffc5422 | 8347 | ret = io_run_task_work_sig(); |
8bad28d8 | 8348 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 8349 | } while (ret >= 0); |
8bad28d8 | 8350 | data->quiesce = false; |
05f3fb3c | 8351 | |
8bad28d8 | 8352 | return ret; |
d7954b2b BM |
8353 | } |
8354 | ||
2d091d62 PB |
8355 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
8356 | { | |
8357 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
8358 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
8359 | ||
8360 | return &data->tags[table_idx][off]; | |
8361 | } | |
8362 | ||
44b31f2f | 8363 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 8364 | { |
2d091d62 PB |
8365 | size_t size = data->nr * sizeof(data->tags[0][0]); |
8366 | ||
8367 | if (data->tags) | |
8368 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
8369 | kfree(data); |
8370 | } | |
8371 | ||
c072481d PB |
8372 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
8373 | u64 __user *utags, unsigned nr, | |
8374 | struct io_rsrc_data **pdata) | |
1ad555c6 | 8375 | { |
b895c9a6 | 8376 | struct io_rsrc_data *data; |
2d091d62 | 8377 | int ret = -ENOMEM; |
d878c816 | 8378 | unsigned i; |
1ad555c6 BM |
8379 | |
8380 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
8381 | if (!data) | |
d878c816 | 8382 | return -ENOMEM; |
2d091d62 | 8383 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 8384 | if (!data->tags) { |
1ad555c6 | 8385 | kfree(data); |
d878c816 PB |
8386 | return -ENOMEM; |
8387 | } | |
2d091d62 PB |
8388 | |
8389 | data->nr = nr; | |
8390 | data->ctx = ctx; | |
8391 | data->do_put = do_put; | |
d878c816 | 8392 | if (utags) { |
2d091d62 | 8393 | ret = -EFAULT; |
d878c816 | 8394 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
8395 | u64 *tag_slot = io_get_tag_slot(data, i); |
8396 | ||
8397 | if (copy_from_user(tag_slot, &utags[i], | |
8398 | sizeof(*tag_slot))) | |
2d091d62 | 8399 | goto fail; |
d878c816 | 8400 | } |
1ad555c6 | 8401 | } |
b60c8dce | 8402 | |
3e942498 | 8403 | atomic_set(&data->refs, 1); |
1ad555c6 | 8404 | init_completion(&data->done); |
d878c816 PB |
8405 | *pdata = data; |
8406 | return 0; | |
2d091d62 PB |
8407 | fail: |
8408 | io_rsrc_data_free(data); | |
8409 | return ret; | |
1ad555c6 BM |
8410 | } |
8411 | ||
9123c8ff PB |
8412 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
8413 | { | |
0bea96f5 PB |
8414 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
8415 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
8416 | return !!table->files; |
8417 | } | |
8418 | ||
042b0d85 | 8419 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 8420 | { |
042b0d85 | 8421 | kvfree(table->files); |
9123c8ff PB |
8422 | table->files = NULL; |
8423 | } | |
8424 | ||
fff4db76 | 8425 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 8426 | { |
fff4db76 PB |
8427 | #if defined(CONFIG_UNIX) |
8428 | if (ctx->ring_sock) { | |
8429 | struct sock *sock = ctx->ring_sock->sk; | |
8430 | struct sk_buff *skb; | |
8431 | ||
8432 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
8433 | kfree_skb(skb); | |
8434 | } | |
8435 | #else | |
8436 | int i; | |
8437 | ||
8438 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8439 | struct file *file; | |
8440 | ||
8441 | file = io_file_from_index(ctx, i); | |
8442 | if (file) | |
8443 | fput(file); | |
8444 | } | |
8445 | #endif | |
042b0d85 | 8446 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 8447 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
8448 | ctx->file_data = NULL; |
8449 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
8450 | } |
8451 | ||
d7954b2b BM |
8452 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
8453 | { | |
d7954b2b BM |
8454 | int ret; |
8455 | ||
08480400 | 8456 | if (!ctx->file_data) |
d7954b2b | 8457 | return -ENXIO; |
08480400 PB |
8458 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
8459 | if (!ret) | |
8460 | __io_sqe_files_unregister(ctx); | |
8461 | return ret; | |
6b06314c JA |
8462 | } |
8463 | ||
37d1e2e3 | 8464 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 8465 | __releases(&sqd->lock) |
37d1e2e3 | 8466 | { |
521d6a73 PB |
8467 | WARN_ON_ONCE(sqd->thread == current); |
8468 | ||
9e138a48 PB |
8469 | /* |
8470 | * Do the dance but not conditional clear_bit() because it'd race with | |
8471 | * other threads incrementing park_pending and setting the bit. | |
8472 | */ | |
37d1e2e3 | 8473 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
8474 | if (atomic_dec_return(&sqd->park_pending)) |
8475 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 8476 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
8477 | } |
8478 | ||
86e0d676 | 8479 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 8480 | __acquires(&sqd->lock) |
37d1e2e3 | 8481 | { |
521d6a73 PB |
8482 | WARN_ON_ONCE(sqd->thread == current); |
8483 | ||
9e138a48 | 8484 | atomic_inc(&sqd->park_pending); |
86e0d676 | 8485 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 8486 | mutex_lock(&sqd->lock); |
05962f95 | 8487 | if (sqd->thread) |
86e0d676 | 8488 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
8489 | } |
8490 | ||
8491 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
8492 | { | |
521d6a73 | 8493 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 8494 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 8495 | |
05962f95 | 8496 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 8497 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
8498 | if (sqd->thread) |
8499 | wake_up_process(sqd->thread); | |
09a6f4ef | 8500 | mutex_unlock(&sqd->lock); |
05962f95 | 8501 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
8502 | } |
8503 | ||
534ca6d6 | 8504 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 8505 | { |
534ca6d6 | 8506 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
8507 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
8508 | ||
37d1e2e3 JA |
8509 | io_sq_thread_stop(sqd); |
8510 | kfree(sqd); | |
8511 | } | |
8512 | } | |
8513 | ||
8514 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
8515 | { | |
8516 | struct io_sq_data *sqd = ctx->sq_data; | |
8517 | ||
8518 | if (sqd) { | |
05962f95 | 8519 | io_sq_thread_park(sqd); |
521d6a73 | 8520 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 8521 | io_sqd_update_thread_idle(sqd); |
05962f95 | 8522 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
8523 | |
8524 | io_put_sq_data(sqd); | |
8525 | ctx->sq_data = NULL; | |
534ca6d6 JA |
8526 | } |
8527 | } | |
8528 | ||
aa06165d JA |
8529 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
8530 | { | |
8531 | struct io_ring_ctx *ctx_attach; | |
8532 | struct io_sq_data *sqd; | |
8533 | struct fd f; | |
8534 | ||
8535 | f = fdget(p->wq_fd); | |
8536 | if (!f.file) | |
8537 | return ERR_PTR(-ENXIO); | |
8538 | if (f.file->f_op != &io_uring_fops) { | |
8539 | fdput(f); | |
8540 | return ERR_PTR(-EINVAL); | |
8541 | } | |
8542 | ||
8543 | ctx_attach = f.file->private_data; | |
8544 | sqd = ctx_attach->sq_data; | |
8545 | if (!sqd) { | |
8546 | fdput(f); | |
8547 | return ERR_PTR(-EINVAL); | |
8548 | } | |
5c2469e0 JA |
8549 | if (sqd->task_tgid != current->tgid) { |
8550 | fdput(f); | |
8551 | return ERR_PTR(-EPERM); | |
8552 | } | |
aa06165d JA |
8553 | |
8554 | refcount_inc(&sqd->refs); | |
8555 | fdput(f); | |
8556 | return sqd; | |
8557 | } | |
8558 | ||
26984fbf PB |
8559 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
8560 | bool *attached) | |
534ca6d6 JA |
8561 | { |
8562 | struct io_sq_data *sqd; | |
8563 | ||
26984fbf | 8564 | *attached = false; |
5c2469e0 JA |
8565 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
8566 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
8567 | if (!IS_ERR(sqd)) { |
8568 | *attached = true; | |
5c2469e0 | 8569 | return sqd; |
26984fbf | 8570 | } |
5c2469e0 JA |
8571 | /* fall through for EPERM case, setup new sqd/task */ |
8572 | if (PTR_ERR(sqd) != -EPERM) | |
8573 | return sqd; | |
8574 | } | |
aa06165d | 8575 | |
534ca6d6 JA |
8576 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
8577 | if (!sqd) | |
8578 | return ERR_PTR(-ENOMEM); | |
8579 | ||
9e138a48 | 8580 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 8581 | refcount_set(&sqd->refs, 1); |
69fb2131 | 8582 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 8583 | mutex_init(&sqd->lock); |
534ca6d6 | 8584 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 8585 | init_completion(&sqd->exited); |
534ca6d6 JA |
8586 | return sqd; |
8587 | } | |
8588 | ||
6b06314c | 8589 | #if defined(CONFIG_UNIX) |
6b06314c JA |
8590 | /* |
8591 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
8592 | * the io_uring can be safely unregistered on process exit, even if we have | |
8593 | * loops in the file referencing. | |
8594 | */ | |
8595 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
8596 | { | |
8597 | struct sock *sk = ctx->ring_sock->sk; | |
8598 | struct scm_fp_list *fpl; | |
8599 | struct sk_buff *skb; | |
08a45173 | 8600 | int i, nr_files; |
6b06314c | 8601 | |
6b06314c JA |
8602 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
8603 | if (!fpl) | |
8604 | return -ENOMEM; | |
8605 | ||
8606 | skb = alloc_skb(0, GFP_KERNEL); | |
8607 | if (!skb) { | |
8608 | kfree(fpl); | |
8609 | return -ENOMEM; | |
8610 | } | |
8611 | ||
8612 | skb->sk = sk; | |
6b06314c | 8613 | |
08a45173 | 8614 | nr_files = 0; |
62e398be | 8615 | fpl->user = get_uid(current_user()); |
6b06314c | 8616 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
8617 | struct file *file = io_file_from_index(ctx, i + offset); |
8618 | ||
8619 | if (!file) | |
08a45173 | 8620 | continue; |
65e19f54 | 8621 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
8622 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
8623 | nr_files++; | |
6b06314c JA |
8624 | } |
8625 | ||
08a45173 JA |
8626 | if (nr_files) { |
8627 | fpl->max = SCM_MAX_FD; | |
8628 | fpl->count = nr_files; | |
8629 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 8630 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
8631 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
8632 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8633 | |
a07211e3 PB |
8634 | for (i = 0; i < nr; i++) { |
8635 | struct file *file = io_file_from_index(ctx, i + offset); | |
8636 | ||
8637 | if (file) | |
8638 | fput(file); | |
8639 | } | |
08a45173 JA |
8640 | } else { |
8641 | kfree_skb(skb); | |
c86d18f4 | 8642 | free_uid(fpl->user); |
08a45173 JA |
8643 | kfree(fpl); |
8644 | } | |
6b06314c JA |
8645 | |
8646 | return 0; | |
8647 | } | |
8648 | ||
8649 | /* | |
8650 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8651 | * causes regular reference counting to break down. We rely on the UNIX | |
8652 | * garbage collection to take care of this problem for us. | |
8653 | */ | |
8654 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8655 | { | |
8656 | unsigned left, total; | |
8657 | int ret = 0; | |
8658 | ||
8659 | total = 0; | |
8660 | left = ctx->nr_user_files; | |
8661 | while (left) { | |
8662 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8663 | |
8664 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8665 | if (ret) | |
8666 | break; | |
8667 | left -= this_files; | |
8668 | total += this_files; | |
8669 | } | |
8670 | ||
8671 | if (!ret) | |
8672 | return 0; | |
8673 | ||
8674 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8675 | struct file *file = io_file_from_index(ctx, total); |
8676 | ||
8677 | if (file) | |
8678 | fput(file); | |
6b06314c JA |
8679 | total++; |
8680 | } | |
8681 | ||
8682 | return ret; | |
8683 | } | |
8684 | #else | |
8685 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8686 | { | |
8687 | return 0; | |
8688 | } | |
8689 | #endif | |
8690 | ||
47e90392 | 8691 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8692 | { |
50238531 | 8693 | struct file *file = prsrc->file; |
05f3fb3c JA |
8694 | #if defined(CONFIG_UNIX) |
8695 | struct sock *sock = ctx->ring_sock->sk; | |
8696 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8697 | struct sk_buff *skb; | |
8698 | int i; | |
8699 | ||
8700 | __skb_queue_head_init(&list); | |
8701 | ||
8702 | /* | |
8703 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8704 | * remove this entry and rearrange the file array. | |
8705 | */ | |
8706 | skb = skb_dequeue(head); | |
8707 | while (skb) { | |
8708 | struct scm_fp_list *fp; | |
8709 | ||
8710 | fp = UNIXCB(skb).fp; | |
8711 | for (i = 0; i < fp->count; i++) { | |
8712 | int left; | |
8713 | ||
8714 | if (fp->fp[i] != file) | |
8715 | continue; | |
8716 | ||
8717 | unix_notinflight(fp->user, fp->fp[i]); | |
8718 | left = fp->count - 1 - i; | |
8719 | if (left) { | |
8720 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8721 | left * sizeof(struct file *)); | |
8722 | } | |
8723 | fp->count--; | |
8724 | if (!fp->count) { | |
8725 | kfree_skb(skb); | |
8726 | skb = NULL; | |
8727 | } else { | |
8728 | __skb_queue_tail(&list, skb); | |
8729 | } | |
8730 | fput(file); | |
8731 | file = NULL; | |
8732 | break; | |
8733 | } | |
8734 | ||
8735 | if (!file) | |
8736 | break; | |
8737 | ||
8738 | __skb_queue_tail(&list, skb); | |
8739 | ||
8740 | skb = skb_dequeue(head); | |
8741 | } | |
8742 | ||
8743 | if (skb_peek(&list)) { | |
8744 | spin_lock_irq(&head->lock); | |
8745 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8746 | __skb_queue_tail(head, skb); | |
8747 | spin_unlock_irq(&head->lock); | |
8748 | } | |
8749 | #else | |
8750 | fput(file); | |
8751 | #endif | |
8752 | } | |
8753 | ||
b895c9a6 | 8754 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8755 | { |
b895c9a6 | 8756 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8757 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8758 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8759 | |
269bbe5f BM |
8760 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8761 | list_del(&prsrc->list); | |
b60c8dce PB |
8762 | |
8763 | if (prsrc->tag) { | |
8764 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8765 | |
8766 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8767 | spin_lock(&ctx->completion_lock); |
913a571a | 8768 | io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); |
b60c8dce | 8769 | io_commit_cqring(ctx); |
79ebeaee | 8770 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8771 | io_cqring_ev_posted(ctx); |
8772 | io_ring_submit_unlock(ctx, lock_ring); | |
8773 | } | |
8774 | ||
40ae0ff7 | 8775 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8776 | kfree(prsrc); |
65e19f54 | 8777 | } |
05589553 | 8778 | |
28a9fe25 | 8779 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8780 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8781 | complete(&rsrc_data->done); | |
2faf852d | 8782 | } |
65e19f54 | 8783 | |
269bbe5f | 8784 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8785 | { |
8786 | struct io_ring_ctx *ctx; | |
8787 | struct llist_node *node; | |
8788 | ||
269bbe5f BM |
8789 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8790 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8791 | |
8792 | while (node) { | |
b895c9a6 | 8793 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8794 | struct llist_node *next = node->next; |
8795 | ||
b895c9a6 | 8796 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8797 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8798 | node = next; |
8799 | } | |
8800 | } | |
8801 | ||
6b06314c | 8802 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8803 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8804 | { |
8805 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8806 | struct file *file; |
f3baed39 | 8807 | int fd, ret; |
846a4ef2 | 8808 | unsigned i; |
6b06314c | 8809 | |
05f3fb3c | 8810 | if (ctx->file_data) |
6b06314c JA |
8811 | return -EBUSY; |
8812 | if (!nr_args) | |
8813 | return -EINVAL; | |
8814 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8815 | return -EMFILE; | |
3a1b8a4e PB |
8816 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8817 | return -EMFILE; | |
a7f0ed5a | 8818 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8819 | if (ret) |
8820 | return ret; | |
d878c816 PB |
8821 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8822 | &ctx->file_data); | |
8823 | if (ret) | |
8824 | return ret; | |
6b06314c | 8825 | |
f3baed39 | 8826 | ret = -ENOMEM; |
aeca241b | 8827 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8828 | goto out_free; |
65e19f54 | 8829 | |
08a45173 | 8830 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8831 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8832 | ret = -EFAULT; |
8833 | goto out_fput; | |
8834 | } | |
08a45173 | 8835 | /* allow sparse sets */ |
792e3582 PB |
8836 | if (fd == -1) { |
8837 | ret = -EINVAL; | |
2d091d62 | 8838 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8839 | goto out_fput; |
08a45173 | 8840 | continue; |
792e3582 | 8841 | } |
6b06314c | 8842 | |
05f3fb3c | 8843 | file = fget(fd); |
6b06314c | 8844 | ret = -EBADF; |
792e3582 | 8845 | if (unlikely(!file)) |
600cf3f8 | 8846 | goto out_fput; |
05f3fb3c | 8847 | |
6b06314c JA |
8848 | /* |
8849 | * Don't allow io_uring instances to be registered. If UNIX | |
8850 | * isn't enabled, then this causes a reference cycle and this | |
8851 | * instance can never get freed. If UNIX is enabled we'll | |
8852 | * handle it just fine, but there's still no point in allowing | |
8853 | * a ring fd as it doesn't support regular read/write anyway. | |
8854 | */ | |
05f3fb3c JA |
8855 | if (file->f_op == &io_uring_fops) { |
8856 | fput(file); | |
600cf3f8 | 8857 | goto out_fput; |
6b06314c | 8858 | } |
aeca241b | 8859 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8860 | } |
8861 | ||
6b06314c | 8862 | ret = io_sqe_files_scm(ctx); |
05589553 | 8863 | if (ret) { |
08480400 | 8864 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8865 | return ret; |
8866 | } | |
6b06314c | 8867 | |
a7f0ed5a | 8868 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8869 | return ret; |
600cf3f8 PB |
8870 | out_fput: |
8871 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8872 | file = io_file_from_index(ctx, i); | |
8873 | if (file) | |
8874 | fput(file); | |
8875 | } | |
042b0d85 | 8876 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8877 | ctx->nr_user_files = 0; |
600cf3f8 | 8878 | out_free: |
44b31f2f | 8879 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8880 | ctx->file_data = NULL; |
6b06314c JA |
8881 | return ret; |
8882 | } | |
8883 | ||
c3a31e60 JA |
8884 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8885 | int index) | |
8886 | { | |
8887 | #if defined(CONFIG_UNIX) | |
8888 | struct sock *sock = ctx->ring_sock->sk; | |
8889 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8890 | struct sk_buff *skb; | |
8891 | ||
8892 | /* | |
8893 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8894 | * file set. If there's no room, fall back to allocating a new skb | |
8895 | * and filling it in. | |
8896 | */ | |
8897 | spin_lock_irq(&head->lock); | |
8898 | skb = skb_peek(head); | |
8899 | if (skb) { | |
8900 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8901 | ||
8902 | if (fpl->count < SCM_MAX_FD) { | |
8903 | __skb_unlink(skb, head); | |
8904 | spin_unlock_irq(&head->lock); | |
8905 | fpl->fp[fpl->count] = get_file(file); | |
8906 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8907 | fpl->count++; | |
8908 | spin_lock_irq(&head->lock); | |
8909 | __skb_queue_head(head, skb); | |
8910 | } else { | |
8911 | skb = NULL; | |
8912 | } | |
8913 | } | |
8914 | spin_unlock_irq(&head->lock); | |
8915 | ||
8916 | if (skb) { | |
8917 | fput(file); | |
8918 | return 0; | |
8919 | } | |
8920 | ||
8921 | return __io_sqe_files_scm(ctx, 1, index); | |
8922 | #else | |
8923 | return 0; | |
8924 | #endif | |
8925 | } | |
8926 | ||
9c7b0ba8 PB |
8927 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8928 | struct io_rsrc_node *node, void *rsrc) | |
8929 | { | |
8f0a2480 | 8930 | u64 *tag_slot = io_get_tag_slot(data, idx); |
9c7b0ba8 PB |
8931 | struct io_rsrc_put *prsrc; |
8932 | ||
8933 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8934 | if (!prsrc) | |
8935 | return -ENOMEM; | |
8936 | ||
8f0a2480 PB |
8937 | prsrc->tag = *tag_slot; |
8938 | *tag_slot = 0; | |
9c7b0ba8 PB |
8939 | prsrc->rsrc = rsrc; |
8940 | list_add(&prsrc->list, &node->rsrc_list); | |
8941 | return 0; | |
8942 | } | |
8943 | ||
b9445598 PB |
8944 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8945 | unsigned int issue_flags, u32 slot_index) | |
8946 | { | |
8947 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 8948 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
9c7b0ba8 | 8949 | bool needs_switch = false; |
b9445598 PB |
8950 | struct io_fixed_file *file_slot; |
8951 | int ret = -EBADF; | |
8952 | ||
3b44b371 | 8953 | io_ring_submit_lock(ctx, needs_lock); |
b9445598 PB |
8954 | if (file->f_op == &io_uring_fops) |
8955 | goto err; | |
8956 | ret = -ENXIO; | |
8957 | if (!ctx->file_data) | |
8958 | goto err; | |
8959 | ret = -EINVAL; | |
8960 | if (slot_index >= ctx->nr_user_files) | |
8961 | goto err; | |
8962 | ||
8963 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8964 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8965 | |
8966 | if (file_slot->file_ptr) { | |
8967 | struct file *old_file; | |
8968 | ||
8969 | ret = io_rsrc_node_switch_start(ctx); | |
8970 | if (ret) | |
8971 | goto err; | |
8972 | ||
8973 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8974 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8975 | ctx->rsrc_node, old_file); | |
8976 | if (ret) | |
8977 | goto err; | |
8978 | file_slot->file_ptr = 0; | |
8979 | needs_switch = true; | |
8980 | } | |
b9445598 PB |
8981 | |
8982 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8983 | io_fixed_file_set(file_slot, file); | |
8984 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8985 | if (ret) { | |
8986 | file_slot->file_ptr = 0; | |
8987 | goto err; | |
8988 | } | |
8989 | ||
8990 | ret = 0; | |
8991 | err: | |
9c7b0ba8 PB |
8992 | if (needs_switch) |
8993 | io_rsrc_node_switch(ctx, ctx->file_data); | |
3b44b371 | 8994 | io_ring_submit_unlock(ctx, needs_lock); |
b9445598 PB |
8995 | if (ret) |
8996 | fput(file); | |
8997 | return ret; | |
8998 | } | |
8999 | ||
7df778be PB |
9000 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
9001 | { | |
9002 | unsigned int offset = req->close.file_slot - 1; | |
9003 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 9004 | bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
7df778be PB |
9005 | struct io_fixed_file *file_slot; |
9006 | struct file *file; | |
4cdd158b | 9007 | int ret; |
7df778be | 9008 | |
3b44b371 | 9009 | io_ring_submit_lock(ctx, needs_lock); |
7df778be PB |
9010 | ret = -ENXIO; |
9011 | if (unlikely(!ctx->file_data)) | |
9012 | goto out; | |
9013 | ret = -EINVAL; | |
9014 | if (offset >= ctx->nr_user_files) | |
9015 | goto out; | |
9016 | ret = io_rsrc_node_switch_start(ctx); | |
9017 | if (ret) | |
9018 | goto out; | |
9019 | ||
4cdd158b PB |
9020 | offset = array_index_nospec(offset, ctx->nr_user_files); |
9021 | file_slot = io_fixed_file_slot(&ctx->file_table, offset); | |
7df778be PB |
9022 | ret = -EBADF; |
9023 | if (!file_slot->file_ptr) | |
9024 | goto out; | |
9025 | ||
9026 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
9027 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
9028 | if (ret) | |
9029 | goto out; | |
9030 | ||
9031 | file_slot->file_ptr = 0; | |
9032 | io_rsrc_node_switch(ctx, ctx->file_data); | |
9033 | ret = 0; | |
9034 | out: | |
3b44b371 | 9035 | io_ring_submit_unlock(ctx, needs_lock); |
7df778be PB |
9036 | return ret; |
9037 | } | |
9038 | ||
05f3fb3c | 9039 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 9040 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
9041 | unsigned nr_args) |
9042 | { | |
c3bdad02 | 9043 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 9044 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 9045 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
9046 | struct io_fixed_file *file_slot; |
9047 | struct file *file; | |
98f0b3b4 PB |
9048 | int fd, i, err = 0; |
9049 | unsigned int done; | |
05589553 | 9050 | bool needs_switch = false; |
c3a31e60 | 9051 | |
98f0b3b4 PB |
9052 | if (!ctx->file_data) |
9053 | return -ENXIO; | |
9054 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
9055 | return -EINVAL; |
9056 | ||
67973b93 | 9057 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
9058 | u64 tag = 0; |
9059 | ||
9060 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
9061 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
9062 | err = -EFAULT; |
9063 | break; | |
9064 | } | |
c3bdad02 PB |
9065 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
9066 | err = -EINVAL; | |
9067 | break; | |
9068 | } | |
4e0377a1 | 9069 | if (fd == IORING_REGISTER_FILES_SKIP) |
9070 | continue; | |
9071 | ||
67973b93 | 9072 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 9073 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 9074 | |
a04b0ac0 PB |
9075 | if (file_slot->file_ptr) { |
9076 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
4cdd158b | 9077 | err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file); |
a5318d3c HD |
9078 | if (err) |
9079 | break; | |
a04b0ac0 | 9080 | file_slot->file_ptr = 0; |
05589553 | 9081 | needs_switch = true; |
c3a31e60 JA |
9082 | } |
9083 | if (fd != -1) { | |
c3a31e60 JA |
9084 | file = fget(fd); |
9085 | if (!file) { | |
9086 | err = -EBADF; | |
9087 | break; | |
9088 | } | |
9089 | /* | |
9090 | * Don't allow io_uring instances to be registered. If | |
9091 | * UNIX isn't enabled, then this causes a reference | |
9092 | * cycle and this instance can never get freed. If UNIX | |
9093 | * is enabled we'll handle it just fine, but there's | |
9094 | * still no point in allowing a ring fd as it doesn't | |
9095 | * support regular read/write anyway. | |
9096 | */ | |
9097 | if (file->f_op == &io_uring_fops) { | |
9098 | fput(file); | |
9099 | err = -EBADF; | |
9100 | break; | |
9101 | } | |
34bb7718 | 9102 | *io_get_tag_slot(data, i) = tag; |
9a321c98 | 9103 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 9104 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 9105 | if (err) { |
a04b0ac0 | 9106 | file_slot->file_ptr = 0; |
f3bd9dae | 9107 | fput(file); |
c3a31e60 | 9108 | break; |
f3bd9dae | 9109 | } |
c3a31e60 | 9110 | } |
05f3fb3c JA |
9111 | } |
9112 | ||
a7f0ed5a PB |
9113 | if (needs_switch) |
9114 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
9115 | return done ? done : err; |
9116 | } | |
05589553 | 9117 | |
685fe7fe JA |
9118 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
9119 | struct task_struct *task) | |
24369c2e | 9120 | { |
e941894e | 9121 | struct io_wq_hash *hash; |
24369c2e | 9122 | struct io_wq_data data; |
24369c2e | 9123 | unsigned int concurrency; |
24369c2e | 9124 | |
362a9e65 | 9125 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
9126 | hash = ctx->hash_map; |
9127 | if (!hash) { | |
9128 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
9129 | if (!hash) { |
9130 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 9131 | return ERR_PTR(-ENOMEM); |
362a9e65 | 9132 | } |
e941894e JA |
9133 | refcount_set(&hash->refs, 1); |
9134 | init_waitqueue_head(&hash->wait); | |
9135 | ctx->hash_map = hash; | |
24369c2e | 9136 | } |
362a9e65 | 9137 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 9138 | |
e941894e | 9139 | data.hash = hash; |
685fe7fe | 9140 | data.task = task; |
ebc11b6c | 9141 | data.free_work = io_wq_free_work; |
f5fa38c5 | 9142 | data.do_work = io_wq_submit_work; |
24369c2e | 9143 | |
d25e3a3d JA |
9144 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
9145 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 9146 | |
5aa75ed5 | 9147 | return io_wq_create(concurrency, &data); |
24369c2e PB |
9148 | } |
9149 | ||
c072481d PB |
9150 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
9151 | struct io_ring_ctx *ctx) | |
0f212204 JA |
9152 | { |
9153 | struct io_uring_task *tctx; | |
d8a6df10 | 9154 | int ret; |
0f212204 | 9155 | |
09899b19 | 9156 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
9157 | if (unlikely(!tctx)) |
9158 | return -ENOMEM; | |
9159 | ||
e7a6c00d JA |
9160 | tctx->registered_rings = kcalloc(IO_RINGFD_REG_MAX, |
9161 | sizeof(struct file *), GFP_KERNEL); | |
9162 | if (unlikely(!tctx->registered_rings)) { | |
9163 | kfree(tctx); | |
9164 | return -ENOMEM; | |
9165 | } | |
9166 | ||
d8a6df10 JA |
9167 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
9168 | if (unlikely(ret)) { | |
e7a6c00d | 9169 | kfree(tctx->registered_rings); |
d8a6df10 JA |
9170 | kfree(tctx); |
9171 | return ret; | |
9172 | } | |
9173 | ||
685fe7fe | 9174 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
9175 | if (IS_ERR(tctx->io_wq)) { |
9176 | ret = PTR_ERR(tctx->io_wq); | |
9177 | percpu_counter_destroy(&tctx->inflight); | |
e7a6c00d | 9178 | kfree(tctx->registered_rings); |
5aa75ed5 JA |
9179 | kfree(tctx); |
9180 | return ret; | |
9181 | } | |
9182 | ||
0f212204 JA |
9183 | xa_init(&tctx->xa); |
9184 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 9185 | atomic_set(&tctx->in_idle, 0); |
0f212204 | 9186 | task->io_uring = tctx; |
7cbf1722 JA |
9187 | spin_lock_init(&tctx->task_lock); |
9188 | INIT_WQ_LIST(&tctx->task_list); | |
4813c377 | 9189 | INIT_WQ_LIST(&tctx->prior_task_list); |
7cbf1722 | 9190 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
9191 | return 0; |
9192 | } | |
9193 | ||
9194 | void __io_uring_free(struct task_struct *tsk) | |
9195 | { | |
9196 | struct io_uring_task *tctx = tsk->io_uring; | |
9197 | ||
9198 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 9199 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 9200 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 9201 | |
e7a6c00d | 9202 | kfree(tctx->registered_rings); |
d8a6df10 | 9203 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
9204 | kfree(tctx); |
9205 | tsk->io_uring = NULL; | |
9206 | } | |
9207 | ||
c072481d PB |
9208 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
9209 | struct io_uring_params *p) | |
2b188cc1 JA |
9210 | { |
9211 | int ret; | |
9212 | ||
d25e3a3d JA |
9213 | /* Retain compatibility with failing for an invalid attach attempt */ |
9214 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
9215 | IORING_SETUP_ATTACH_WQ) { | |
9216 | struct fd f; | |
9217 | ||
9218 | f = fdget(p->wq_fd); | |
9219 | if (!f.file) | |
9220 | return -ENXIO; | |
0cc936f7 JA |
9221 | if (f.file->f_op != &io_uring_fops) { |
9222 | fdput(f); | |
f2a48dd0 | 9223 | return -EINVAL; |
0cc936f7 JA |
9224 | } |
9225 | fdput(f); | |
d25e3a3d | 9226 | } |
6c271ce2 | 9227 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 9228 | struct task_struct *tsk; |
534ca6d6 | 9229 | struct io_sq_data *sqd; |
26984fbf | 9230 | bool attached; |
534ca6d6 | 9231 | |
cdc1404a PM |
9232 | ret = security_uring_sqpoll(); |
9233 | if (ret) | |
9234 | return ret; | |
9235 | ||
26984fbf | 9236 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
9237 | if (IS_ERR(sqd)) { |
9238 | ret = PTR_ERR(sqd); | |
9239 | goto err; | |
9240 | } | |
69fb2131 | 9241 | |
7c30f36a | 9242 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 9243 | ctx->sq_data = sqd; |
917257da JA |
9244 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
9245 | if (!ctx->sq_thread_idle) | |
9246 | ctx->sq_thread_idle = HZ; | |
9247 | ||
78d7f6ba | 9248 | io_sq_thread_park(sqd); |
de75a3d3 PB |
9249 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
9250 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 9251 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 9252 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
9253 | io_sq_thread_unpark(sqd); |
9254 | ||
de75a3d3 PB |
9255 | if (ret < 0) |
9256 | goto err; | |
9257 | if (attached) | |
5aa75ed5 | 9258 | return 0; |
aa06165d | 9259 | |
6c271ce2 | 9260 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 9261 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 9262 | |
917257da | 9263 | ret = -EINVAL; |
f2a48dd0 | 9264 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 9265 | goto err_sqpoll; |
37d1e2e3 | 9266 | sqd->sq_cpu = cpu; |
6c271ce2 | 9267 | } else { |
37d1e2e3 | 9268 | sqd->sq_cpu = -1; |
6c271ce2 | 9269 | } |
37d1e2e3 JA |
9270 | |
9271 | sqd->task_pid = current->pid; | |
5c2469e0 | 9272 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
9273 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
9274 | if (IS_ERR(tsk)) { | |
9275 | ret = PTR_ERR(tsk); | |
e8f98f24 | 9276 | goto err_sqpoll; |
6c271ce2 | 9277 | } |
97a73a0f | 9278 | |
46fe18b1 | 9279 | sqd->thread = tsk; |
97a73a0f | 9280 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 9281 | wake_up_new_task(tsk); |
0f212204 JA |
9282 | if (ret) |
9283 | goto err; | |
6c271ce2 JA |
9284 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
9285 | /* Can't have SQ_AFF without SQPOLL */ | |
9286 | ret = -EINVAL; | |
9287 | goto err; | |
9288 | } | |
9289 | ||
2b188cc1 | 9290 | return 0; |
f2a48dd0 PB |
9291 | err_sqpoll: |
9292 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 9293 | err: |
37d1e2e3 | 9294 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
9295 | return ret; |
9296 | } | |
9297 | ||
a087e2b5 BM |
9298 | static inline void __io_unaccount_mem(struct user_struct *user, |
9299 | unsigned long nr_pages) | |
2b188cc1 JA |
9300 | { |
9301 | atomic_long_sub(nr_pages, &user->locked_vm); | |
9302 | } | |
9303 | ||
a087e2b5 BM |
9304 | static inline int __io_account_mem(struct user_struct *user, |
9305 | unsigned long nr_pages) | |
2b188cc1 JA |
9306 | { |
9307 | unsigned long page_limit, cur_pages, new_pages; | |
9308 | ||
9309 | /* Don't allow more pages than we can safely lock */ | |
9310 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
9311 | ||
9312 | do { | |
9313 | cur_pages = atomic_long_read(&user->locked_vm); | |
9314 | new_pages = cur_pages + nr_pages; | |
9315 | if (new_pages > page_limit) | |
9316 | return -ENOMEM; | |
9317 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
9318 | new_pages) != cur_pages); | |
9319 | ||
9320 | return 0; | |
9321 | } | |
9322 | ||
26bfa89e | 9323 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 9324 | { |
62e398be | 9325 | if (ctx->user) |
a087e2b5 | 9326 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 9327 | |
26bfa89e JA |
9328 | if (ctx->mm_account) |
9329 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
9330 | } |
9331 | ||
26bfa89e | 9332 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 9333 | { |
30975825 BM |
9334 | int ret; |
9335 | ||
62e398be | 9336 | if (ctx->user) { |
30975825 BM |
9337 | ret = __io_account_mem(ctx->user, nr_pages); |
9338 | if (ret) | |
9339 | return ret; | |
9340 | } | |
9341 | ||
26bfa89e JA |
9342 | if (ctx->mm_account) |
9343 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
9344 | |
9345 | return 0; | |
9346 | } | |
9347 | ||
2b188cc1 JA |
9348 | static void io_mem_free(void *ptr) |
9349 | { | |
52e04ef4 MR |
9350 | struct page *page; |
9351 | ||
9352 | if (!ptr) | |
9353 | return; | |
2b188cc1 | 9354 | |
52e04ef4 | 9355 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
9356 | if (put_page_testzero(page)) |
9357 | free_compound_page(page); | |
9358 | } | |
9359 | ||
9360 | static void *io_mem_alloc(size_t size) | |
9361 | { | |
0a3f1e0b | 9362 | gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP; |
2b188cc1 | 9363 | |
0a3f1e0b | 9364 | return (void *) __get_free_pages(gfp, get_order(size)); |
2b188cc1 JA |
9365 | } |
9366 | ||
75b28aff HV |
9367 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
9368 | size_t *sq_offset) | |
9369 | { | |
9370 | struct io_rings *rings; | |
9371 | size_t off, sq_array_size; | |
9372 | ||
9373 | off = struct_size(rings, cqes, cq_entries); | |
9374 | if (off == SIZE_MAX) | |
9375 | return SIZE_MAX; | |
9376 | ||
9377 | #ifdef CONFIG_SMP | |
9378 | off = ALIGN(off, SMP_CACHE_BYTES); | |
9379 | if (off == 0) | |
9380 | return SIZE_MAX; | |
9381 | #endif | |
9382 | ||
b36200f5 DV |
9383 | if (sq_offset) |
9384 | *sq_offset = off; | |
9385 | ||
75b28aff HV |
9386 | sq_array_size = array_size(sizeof(u32), sq_entries); |
9387 | if (sq_array_size == SIZE_MAX) | |
9388 | return SIZE_MAX; | |
9389 | ||
9390 | if (check_add_overflow(off, sq_array_size, &off)) | |
9391 | return SIZE_MAX; | |
9392 | ||
75b28aff HV |
9393 | return off; |
9394 | } | |
9395 | ||
41edf1a5 | 9396 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 9397 | { |
41edf1a5 | 9398 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
9399 | unsigned int i; |
9400 | ||
6224843d PB |
9401 | if (imu != ctx->dummy_ubuf) { |
9402 | for (i = 0; i < imu->nr_bvecs; i++) | |
9403 | unpin_user_page(imu->bvec[i].bv_page); | |
9404 | if (imu->acct_pages) | |
9405 | io_unaccount_mem(ctx, imu->acct_pages); | |
9406 | kvfree(imu); | |
9407 | } | |
41edf1a5 | 9408 | *slot = NULL; |
7f61a1e9 PB |
9409 | } |
9410 | ||
bd54b6fe | 9411 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 9412 | { |
634d00df PB |
9413 | io_buffer_unmap(ctx, &prsrc->buf); |
9414 | prsrc->buf = NULL; | |
bd54b6fe | 9415 | } |
edafccee | 9416 | |
bd54b6fe BM |
9417 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
9418 | { | |
9419 | unsigned int i; | |
edafccee | 9420 | |
7f61a1e9 PB |
9421 | for (i = 0; i < ctx->nr_user_bufs; i++) |
9422 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 9423 | kfree(ctx->user_bufs); |
bb6659cc | 9424 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 9425 | ctx->user_bufs = NULL; |
bd54b6fe | 9426 | ctx->buf_data = NULL; |
edafccee | 9427 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
9428 | } |
9429 | ||
0a96bbe4 | 9430 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 9431 | { |
bd54b6fe | 9432 | int ret; |
edafccee | 9433 | |
bd54b6fe | 9434 | if (!ctx->buf_data) |
edafccee JA |
9435 | return -ENXIO; |
9436 | ||
bd54b6fe BM |
9437 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
9438 | if (!ret) | |
9439 | __io_sqe_buffers_unregister(ctx); | |
9440 | return ret; | |
edafccee JA |
9441 | } |
9442 | ||
9443 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
9444 | void __user *arg, unsigned index) | |
9445 | { | |
9446 | struct iovec __user *src; | |
9447 | ||
9448 | #ifdef CONFIG_COMPAT | |
9449 | if (ctx->compat) { | |
9450 | struct compat_iovec __user *ciovs; | |
9451 | struct compat_iovec ciov; | |
9452 | ||
9453 | ciovs = (struct compat_iovec __user *) arg; | |
9454 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
9455 | return -EFAULT; | |
9456 | ||
d55e5f5b | 9457 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
9458 | dst->iov_len = ciov.iov_len; |
9459 | return 0; | |
9460 | } | |
9461 | #endif | |
9462 | src = (struct iovec __user *) arg; | |
9463 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
9464 | return -EFAULT; | |
9465 | return 0; | |
9466 | } | |
9467 | ||
de293938 JA |
9468 | /* |
9469 | * Not super efficient, but this is just a registration time. And we do cache | |
9470 | * the last compound head, so generally we'll only do a full search if we don't | |
9471 | * match that one. | |
9472 | * | |
9473 | * We check if the given compound head page has already been accounted, to | |
9474 | * avoid double accounting it. This allows us to account the full size of the | |
9475 | * page, not just the constituent pages of a huge page. | |
9476 | */ | |
9477 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
9478 | int nr_pages, struct page *hpage) | |
9479 | { | |
9480 | int i, j; | |
9481 | ||
9482 | /* check current page array */ | |
9483 | for (i = 0; i < nr_pages; i++) { | |
9484 | if (!PageCompound(pages[i])) | |
9485 | continue; | |
9486 | if (compound_head(pages[i]) == hpage) | |
9487 | return true; | |
9488 | } | |
9489 | ||
9490 | /* check previously registered pages */ | |
9491 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 9492 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
9493 | |
9494 | for (j = 0; j < imu->nr_bvecs; j++) { | |
9495 | if (!PageCompound(imu->bvec[j].bv_page)) | |
9496 | continue; | |
9497 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
9498 | return true; | |
9499 | } | |
9500 | } | |
9501 | ||
9502 | return false; | |
9503 | } | |
9504 | ||
9505 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
9506 | int nr_pages, struct io_mapped_ubuf *imu, | |
9507 | struct page **last_hpage) | |
9508 | { | |
9509 | int i, ret; | |
9510 | ||
216e5835 | 9511 | imu->acct_pages = 0; |
de293938 JA |
9512 | for (i = 0; i < nr_pages; i++) { |
9513 | if (!PageCompound(pages[i])) { | |
9514 | imu->acct_pages++; | |
9515 | } else { | |
9516 | struct page *hpage; | |
9517 | ||
9518 | hpage = compound_head(pages[i]); | |
9519 | if (hpage == *last_hpage) | |
9520 | continue; | |
9521 | *last_hpage = hpage; | |
9522 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
9523 | continue; | |
9524 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
9525 | } | |
9526 | } | |
9527 | ||
9528 | if (!imu->acct_pages) | |
9529 | return 0; | |
9530 | ||
26bfa89e | 9531 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
9532 | if (ret) |
9533 | imu->acct_pages = 0; | |
9534 | return ret; | |
9535 | } | |
9536 | ||
0a96bbe4 | 9537 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 9538 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 9539 | struct page **last_hpage) |
edafccee | 9540 | { |
41edf1a5 | 9541 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
9542 | struct vm_area_struct **vmas = NULL; |
9543 | struct page **pages = NULL; | |
0a96bbe4 BM |
9544 | unsigned long off, start, end, ubuf; |
9545 | size_t size; | |
9546 | int ret, pret, nr_pages, i; | |
9547 | ||
6224843d PB |
9548 | if (!iov->iov_base) { |
9549 | *pimu = ctx->dummy_ubuf; | |
9550 | return 0; | |
9551 | } | |
9552 | ||
0a96bbe4 BM |
9553 | ubuf = (unsigned long) iov->iov_base; |
9554 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
9555 | start = ubuf >> PAGE_SHIFT; | |
9556 | nr_pages = end - start; | |
9557 | ||
41edf1a5 | 9558 | *pimu = NULL; |
0a96bbe4 BM |
9559 | ret = -ENOMEM; |
9560 | ||
9561 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
9562 | if (!pages) | |
9563 | goto done; | |
9564 | ||
9565 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
9566 | GFP_KERNEL); | |
9567 | if (!vmas) | |
9568 | goto done; | |
edafccee | 9569 | |
41edf1a5 | 9570 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 9571 | if (!imu) |
0a96bbe4 BM |
9572 | goto done; |
9573 | ||
9574 | ret = 0; | |
9575 | mmap_read_lock(current->mm); | |
9576 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
9577 | pages, vmas); | |
9578 | if (pret == nr_pages) { | |
9579 | /* don't support file backed memory */ | |
9580 | for (i = 0; i < nr_pages; i++) { | |
9581 | struct vm_area_struct *vma = vmas[i]; | |
9582 | ||
40dad765 PB |
9583 | if (vma_is_shmem(vma)) |
9584 | continue; | |
0a96bbe4 BM |
9585 | if (vma->vm_file && |
9586 | !is_file_hugepages(vma->vm_file)) { | |
9587 | ret = -EOPNOTSUPP; | |
9588 | break; | |
9589 | } | |
9590 | } | |
9591 | } else { | |
9592 | ret = pret < 0 ? pret : -EFAULT; | |
9593 | } | |
9594 | mmap_read_unlock(current->mm); | |
9595 | if (ret) { | |
9596 | /* | |
9597 | * if we did partial map, or found file backed vmas, | |
9598 | * release any pages we did get | |
9599 | */ | |
9600 | if (pret > 0) | |
9601 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9602 | goto done; |
9603 | } | |
9604 | ||
9605 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
9606 | if (ret) { | |
9607 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9608 | goto done; |
9609 | } | |
9610 | ||
9611 | off = ubuf & ~PAGE_MASK; | |
9612 | size = iov->iov_len; | |
9613 | for (i = 0; i < nr_pages; i++) { | |
9614 | size_t vec_len; | |
9615 | ||
9616 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
9617 | imu->bvec[i].bv_page = pages[i]; | |
9618 | imu->bvec[i].bv_len = vec_len; | |
9619 | imu->bvec[i].bv_offset = off; | |
9620 | off = 0; | |
9621 | size -= vec_len; | |
9622 | } | |
9623 | /* store original address for later verification */ | |
9624 | imu->ubuf = ubuf; | |
4751f53d | 9625 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 9626 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 9627 | *pimu = imu; |
0a96bbe4 BM |
9628 | ret = 0; |
9629 | done: | |
41edf1a5 PB |
9630 | if (ret) |
9631 | kvfree(imu); | |
0a96bbe4 BM |
9632 | kvfree(pages); |
9633 | kvfree(vmas); | |
9634 | return ret; | |
9635 | } | |
9636 | ||
2b358604 | 9637 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 9638 | { |
87094465 PB |
9639 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
9640 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9641 | } |
edafccee | 9642 | |
2b358604 BM |
9643 | static int io_buffer_validate(struct iovec *iov) |
9644 | { | |
50e96989 PB |
9645 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9646 | ||
2b358604 BM |
9647 | /* |
9648 | * Don't impose further limits on the size and buffer | |
9649 | * constraints here, we'll -EINVAL later when IO is | |
9650 | * submitted if they are wrong. | |
9651 | */ | |
6224843d PB |
9652 | if (!iov->iov_base) |
9653 | return iov->iov_len ? -EFAULT : 0; | |
9654 | if (!iov->iov_len) | |
2b358604 | 9655 | return -EFAULT; |
edafccee | 9656 | |
2b358604 BM |
9657 | /* arbitrary limit, but we need something */ |
9658 | if (iov->iov_len > SZ_1G) | |
9659 | return -EFAULT; | |
edafccee | 9660 | |
50e96989 PB |
9661 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9662 | return -EOVERFLOW; | |
9663 | ||
2b358604 BM |
9664 | return 0; |
9665 | } | |
edafccee | 9666 | |
2b358604 | 9667 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9668 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9669 | { |
bd54b6fe BM |
9670 | struct page *last_hpage = NULL; |
9671 | struct io_rsrc_data *data; | |
2b358604 BM |
9672 | int i, ret; |
9673 | struct iovec iov; | |
edafccee | 9674 | |
87094465 PB |
9675 | if (ctx->user_bufs) |
9676 | return -EBUSY; | |
489809e2 | 9677 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9678 | return -EINVAL; |
bd54b6fe | 9679 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9680 | if (ret) |
9681 | return ret; | |
d878c816 PB |
9682 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9683 | if (ret) | |
9684 | return ret; | |
bd54b6fe BM |
9685 | ret = io_buffers_map_alloc(ctx, nr_args); |
9686 | if (ret) { | |
bb6659cc | 9687 | io_rsrc_data_free(data); |
bd54b6fe BM |
9688 | return ret; |
9689 | } | |
edafccee | 9690 | |
87094465 | 9691 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9692 | ret = io_copy_iov(ctx, &iov, arg, i); |
9693 | if (ret) | |
0a96bbe4 | 9694 | break; |
2b358604 BM |
9695 | ret = io_buffer_validate(&iov); |
9696 | if (ret) | |
0a96bbe4 | 9697 | break; |
2d091d62 | 9698 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9699 | ret = -EINVAL; |
9700 | break; | |
9701 | } | |
edafccee | 9702 | |
41edf1a5 PB |
9703 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9704 | &last_hpage); | |
0a96bbe4 BM |
9705 | if (ret) |
9706 | break; | |
edafccee | 9707 | } |
0a96bbe4 | 9708 | |
bd54b6fe | 9709 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9710 | |
bd54b6fe BM |
9711 | ctx->buf_data = data; |
9712 | if (ret) | |
9713 | __io_sqe_buffers_unregister(ctx); | |
9714 | else | |
9715 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9716 | return ret; |
9717 | } | |
9718 | ||
634d00df PB |
9719 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9720 | struct io_uring_rsrc_update2 *up, | |
9721 | unsigned int nr_args) | |
9722 | { | |
9723 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9724 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9725 | struct page *last_hpage = NULL; |
9726 | bool needs_switch = false; | |
9727 | __u32 done; | |
9728 | int i, err; | |
9729 | ||
9730 | if (!ctx->buf_data) | |
9731 | return -ENXIO; | |
9732 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9733 | return -EINVAL; | |
9734 | ||
9735 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9736 | struct io_mapped_ubuf *imu; |
9737 | int offset = up->offset + done; | |
634d00df PB |
9738 | u64 tag = 0; |
9739 | ||
9740 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9741 | if (err) | |
9742 | break; | |
9743 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9744 | err = -EFAULT; | |
9745 | break; | |
9746 | } | |
0b8c0e7c PB |
9747 | err = io_buffer_validate(&iov); |
9748 | if (err) | |
9749 | break; | |
cf3770e7 CIK |
9750 | if (!iov.iov_base && tag) { |
9751 | err = -EINVAL; | |
9752 | break; | |
9753 | } | |
0b8c0e7c PB |
9754 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9755 | if (err) | |
9756 | break; | |
634d00df | 9757 | |
0b8c0e7c | 9758 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9759 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
4cdd158b | 9760 | err = io_queue_rsrc_removal(ctx->buf_data, i, |
0b8c0e7c PB |
9761 | ctx->rsrc_node, ctx->user_bufs[i]); |
9762 | if (unlikely(err)) { | |
9763 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9764 | break; |
0b8c0e7c | 9765 | } |
634d00df PB |
9766 | ctx->user_bufs[i] = NULL; |
9767 | needs_switch = true; | |
9768 | } | |
9769 | ||
0b8c0e7c | 9770 | ctx->user_bufs[i] = imu; |
2d091d62 | 9771 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9772 | } |
9773 | ||
9774 | if (needs_switch) | |
9775 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9776 | return done ? done : err; | |
9777 | } | |
9778 | ||
c75312dd UA |
9779 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg, |
9780 | unsigned int eventfd_async) | |
9b402849 | 9781 | { |
77bc59b4 | 9782 | struct io_ev_fd *ev_fd; |
9b402849 | 9783 | __s32 __user *fds = arg; |
f0a4e62b | 9784 | int fd; |
9b402849 | 9785 | |
77bc59b4 UA |
9786 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, |
9787 | lockdep_is_held(&ctx->uring_lock)); | |
9788 | if (ev_fd) | |
9b402849 JA |
9789 | return -EBUSY; |
9790 | ||
9791 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9792 | return -EFAULT; | |
9793 | ||
77bc59b4 UA |
9794 | ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL); |
9795 | if (!ev_fd) | |
9796 | return -ENOMEM; | |
fe7e3257 | 9797 | |
77bc59b4 UA |
9798 | ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd); |
9799 | if (IS_ERR(ev_fd->cq_ev_fd)) { | |
f0a4e62b | 9800 | int ret = PTR_ERR(ev_fd->cq_ev_fd); |
77bc59b4 | 9801 | kfree(ev_fd); |
9b402849 JA |
9802 | return ret; |
9803 | } | |
c75312dd | 9804 | ev_fd->eventfd_async = eventfd_async; |
9aa8dfde | 9805 | ctx->has_evfd = true; |
77bc59b4 | 9806 | rcu_assign_pointer(ctx->io_ev_fd, ev_fd); |
f0a4e62b | 9807 | return 0; |
77bc59b4 UA |
9808 | } |
9809 | ||
9810 | static void io_eventfd_put(struct rcu_head *rcu) | |
9811 | { | |
9812 | struct io_ev_fd *ev_fd = container_of(rcu, struct io_ev_fd, rcu); | |
9813 | ||
9814 | eventfd_ctx_put(ev_fd->cq_ev_fd); | |
9815 | kfree(ev_fd); | |
9b402849 JA |
9816 | } |
9817 | ||
9818 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9819 | { | |
77bc59b4 UA |
9820 | struct io_ev_fd *ev_fd; |
9821 | ||
9822 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, | |
9823 | lockdep_is_held(&ctx->uring_lock)); | |
9824 | if (ev_fd) { | |
9aa8dfde | 9825 | ctx->has_evfd = false; |
77bc59b4 UA |
9826 | rcu_assign_pointer(ctx->io_ev_fd, NULL); |
9827 | call_rcu(&ev_fd->rcu, io_eventfd_put); | |
9b402849 JA |
9828 | return 0; |
9829 | } | |
9830 | ||
9831 | return -ENXIO; | |
9832 | } | |
9833 | ||
5a2e745d JA |
9834 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9835 | { | |
dbc7d452 JA |
9836 | int i; |
9837 | ||
9838 | for (i = 0; i < (1U << IO_BUFFERS_HASH_BITS); i++) { | |
9839 | struct list_head *list = &ctx->io_buffers[i]; | |
9e15c3a0 | 9840 | |
dbc7d452 JA |
9841 | while (!list_empty(list)) { |
9842 | struct io_buffer_list *bl; | |
9843 | ||
9844 | bl = list_first_entry(list, struct io_buffer_list, list); | |
9845 | __io_remove_buffers(ctx, bl, -1U); | |
9846 | list_del(&bl->list); | |
9847 | kfree(bl); | |
9848 | } | |
9849 | } | |
cc3cec83 JA |
9850 | |
9851 | while (!list_empty(&ctx->io_buffers_pages)) { | |
9852 | struct page *page; | |
9853 | ||
9854 | page = list_first_entry(&ctx->io_buffers_pages, struct page, lru); | |
9855 | list_del_init(&page->lru); | |
9856 | __free_page(page); | |
9857 | } | |
5a2e745d JA |
9858 | } |
9859 | ||
4010fec4 | 9860 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9861 | { |
cd0ca2e0 | 9862 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 9863 | int nr = 0; |
bf019da7 | 9864 | |
9a4fdbd8 | 9865 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 9866 | io_flush_cached_locked_reqs(ctx, state); |
9a4fdbd8 | 9867 | |
c2b6c6bc PB |
9868 | while (state->free_list.next) { |
9869 | struct io_wq_work_node *node; | |
9870 | struct io_kiocb *req; | |
9a4fdbd8 | 9871 | |
c2b6c6bc PB |
9872 | node = wq_stack_extract(&state->free_list); |
9873 | req = container_of(node, struct io_kiocb, comp_list); | |
9874 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 9875 | nr++; |
c2b6c6bc | 9876 | } |
37f0e767 PB |
9877 | if (nr) |
9878 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
9879 | mutex_unlock(&ctx->uring_lock); |
9880 | } | |
9881 | ||
43597aac | 9882 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9883 | { |
43597aac | 9884 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9885 | wait_for_completion(&data->done); |
bd54b6fe | 9886 | } |
04fc6c80 | 9887 | |
4d9237e3 JA |
9888 | static void io_flush_apoll_cache(struct io_ring_ctx *ctx) |
9889 | { | |
9890 | struct async_poll *apoll; | |
9891 | ||
9892 | while (!list_empty(&ctx->apoll_cache)) { | |
9893 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, | |
9894 | poll.wait.entry); | |
9895 | list_del(&apoll->poll.wait.entry); | |
9896 | kfree(apoll); | |
9897 | } | |
9898 | } | |
9899 | ||
c072481d | 9900 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9901 | { |
37d1e2e3 | 9902 | io_sq_thread_finish(ctx); |
2aede0e4 | 9903 | |
37d1e2e3 | 9904 | if (ctx->mm_account) { |
2aede0e4 JA |
9905 | mmdrop(ctx->mm_account); |
9906 | ctx->mm_account = NULL; | |
30975825 | 9907 | } |
def596e9 | 9908 | |
ab409402 | 9909 | io_rsrc_refs_drop(ctx); |
43597aac PB |
9910 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9911 | io_wait_rsrc_data(ctx->buf_data); | |
9912 | io_wait_rsrc_data(ctx->file_data); | |
9913 | ||
8bad28d8 | 9914 | mutex_lock(&ctx->uring_lock); |
43597aac | 9915 | if (ctx->buf_data) |
bd54b6fe | 9916 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9917 | if (ctx->file_data) |
08480400 | 9918 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9919 | if (ctx->rings) |
9920 | __io_cqring_overflow_flush(ctx, true); | |
9b402849 | 9921 | io_eventfd_unregister(ctx); |
4d9237e3 | 9922 | io_flush_apoll_cache(ctx); |
77bc59b4 | 9923 | mutex_unlock(&ctx->uring_lock); |
5a2e745d | 9924 | io_destroy_buffers(ctx); |
07db298a PB |
9925 | if (ctx->sq_creds) |
9926 | put_cred(ctx->sq_creds); | |
def596e9 | 9927 | |
a7f0ed5a PB |
9928 | /* there are no registered resources left, nobody uses it */ |
9929 | if (ctx->rsrc_node) | |
9930 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9931 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9932 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 9933 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 9934 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
9935 | |
9936 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9937 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9938 | |
2b188cc1 | 9939 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9940 | if (ctx->ring_sock) { |
9941 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9942 | sock_release(ctx->ring_sock); |
355e8d26 | 9943 | } |
2b188cc1 | 9944 | #endif |
ef9dd637 | 9945 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9946 | |
75b28aff | 9947 | io_mem_free(ctx->rings); |
2b188cc1 | 9948 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9949 | |
9950 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9951 | free_uid(ctx->user); |
4010fec4 | 9952 | io_req_caches_free(ctx); |
e941894e JA |
9953 | if (ctx->hash_map) |
9954 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9955 | kfree(ctx->cancel_hash); |
6224843d | 9956 | kfree(ctx->dummy_ubuf); |
dbc7d452 | 9957 | kfree(ctx->io_buffers); |
2b188cc1 JA |
9958 | kfree(ctx); |
9959 | } | |
9960 | ||
9961 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9962 | { | |
9963 | struct io_ring_ctx *ctx = file->private_data; | |
9964 | __poll_t mask = 0; | |
9965 | ||
d60aa65b | 9966 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
9967 | /* |
9968 | * synchronizes with barrier from wq_has_sleeper call in | |
9969 | * io_commit_cqring | |
9970 | */ | |
2b188cc1 | 9971 | smp_rmb(); |
90554200 | 9972 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9973 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9974 | |
9975 | /* | |
9976 | * Don't flush cqring overflow list here, just do a simple check. | |
9977 | * Otherwise there could possible be ABBA deadlock: | |
9978 | * CPU0 CPU1 | |
9979 | * ---- ---- | |
9980 | * lock(&ctx->uring_lock); | |
9981 | * lock(&ep->mtx); | |
9982 | * lock(&ctx->uring_lock); | |
9983 | * lock(&ep->mtx); | |
9984 | * | |
9985 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9986 | * pushs them to do the flush. | |
9987 | */ | |
5ed7a37d | 9988 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9989 | mask |= EPOLLIN | EPOLLRDNORM; |
9990 | ||
9991 | return mask; | |
9992 | } | |
9993 | ||
0bead8cd | 9994 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9995 | { |
4379bf8b | 9996 | const struct cred *creds; |
071698e1 | 9997 | |
61cf9370 | 9998 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9999 | if (creds) { |
10000 | put_cred(creds); | |
0bead8cd | 10001 | return 0; |
1e6fa521 | 10002 | } |
0bead8cd YD |
10003 | |
10004 | return -EINVAL; | |
10005 | } | |
10006 | ||
d56d938b PB |
10007 | struct io_tctx_exit { |
10008 | struct callback_head task_work; | |
10009 | struct completion completion; | |
baf186c4 | 10010 | struct io_ring_ctx *ctx; |
d56d938b PB |
10011 | }; |
10012 | ||
c072481d | 10013 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
10014 | { |
10015 | struct io_uring_task *tctx = current->io_uring; | |
10016 | struct io_tctx_exit *work; | |
10017 | ||
10018 | work = container_of(cb, struct io_tctx_exit, task_work); | |
10019 | /* | |
10020 | * When @in_idle, we're in cancellation and it's racy to remove the | |
10021 | * node. It'll be removed by the end of cancellation, just ignore it. | |
10022 | */ | |
10023 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 10024 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
10025 | complete(&work->completion); |
10026 | } | |
10027 | ||
c072481d | 10028 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
10029 | { |
10030 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
10031 | ||
10032 | return req->ctx == data; | |
10033 | } | |
10034 | ||
c072481d | 10035 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 10036 | { |
d56d938b | 10037 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 10038 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 10039 | unsigned long interval = HZ / 20; |
d56d938b PB |
10040 | struct io_tctx_exit exit; |
10041 | struct io_tctx_node *node; | |
10042 | int ret; | |
85faa7b8 | 10043 | |
56952e91 JA |
10044 | /* |
10045 | * If we're doing polled IO and end up having requests being | |
10046 | * submitted async (out-of-line), then completions can come in while | |
10047 | * we're waiting for refs to drop. We need to reap these manually, | |
10048 | * as nobody else will be looking for them. | |
10049 | */ | |
b2edc0a7 | 10050 | do { |
3dd0c97a | 10051 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
10052 | if (ctx->sq_data) { |
10053 | struct io_sq_data *sqd = ctx->sq_data; | |
10054 | struct task_struct *tsk; | |
10055 | ||
10056 | io_sq_thread_park(sqd); | |
10057 | tsk = sqd->thread; | |
10058 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
10059 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
10060 | io_cancel_ctx_cb, ctx, true); | |
10061 | io_sq_thread_unpark(sqd); | |
10062 | } | |
b5bb3a24 | 10063 | |
37f0e767 PB |
10064 | io_req_caches_free(ctx); |
10065 | ||
58d3be2c PB |
10066 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
10067 | /* there is little hope left, don't run it too often */ | |
10068 | interval = HZ * 60; | |
10069 | } | |
10070 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 10071 | |
7f00651a PB |
10072 | init_completion(&exit.completion); |
10073 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
10074 | exit.ctx = ctx; | |
89b5066e PB |
10075 | /* |
10076 | * Some may use context even when all refs and requests have been put, | |
10077 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 10078 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
10079 | * this lock/unlock section also waits them to finish. |
10080 | */ | |
d56d938b PB |
10081 | mutex_lock(&ctx->uring_lock); |
10082 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
10083 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
10084 | ||
d56d938b PB |
10085 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
10086 | ctx_node); | |
7f00651a PB |
10087 | /* don't spin on a single task if cancellation failed */ |
10088 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
10089 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
10090 | if (WARN_ON_ONCE(ret)) | |
10091 | continue; | |
d56d938b PB |
10092 | |
10093 | mutex_unlock(&ctx->uring_lock); | |
10094 | wait_for_completion(&exit.completion); | |
d56d938b PB |
10095 | mutex_lock(&ctx->uring_lock); |
10096 | } | |
10097 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
10098 | spin_lock(&ctx->completion_lock); |
10099 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 10100 | |
85faa7b8 JA |
10101 | io_ring_ctx_free(ctx); |
10102 | } | |
10103 | ||
80c4cbdb | 10104 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
10105 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
10106 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
10107 | { |
10108 | struct io_kiocb *req, *tmp; | |
10109 | int canceled = 0; | |
10110 | ||
79ebeaee JA |
10111 | spin_lock(&ctx->completion_lock); |
10112 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 10113 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 10114 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
10115 | io_kill_timeout(req, -ECANCELED); |
10116 | canceled++; | |
10117 | } | |
10118 | } | |
79ebeaee | 10119 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
10120 | if (canceled != 0) |
10121 | io_commit_cqring(ctx); | |
79ebeaee | 10122 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
10123 | if (canceled != 0) |
10124 | io_cqring_ev_posted(ctx); | |
10125 | return canceled != 0; | |
10126 | } | |
10127 | ||
c072481d | 10128 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 10129 | { |
61cf9370 MWO |
10130 | unsigned long index; |
10131 | struct creds *creds; | |
10132 | ||
2b188cc1 JA |
10133 | mutex_lock(&ctx->uring_lock); |
10134 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 10135 | if (ctx->rings) |
6c2450ae | 10136 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
10137 | xa_for_each(&ctx->personalities, index, creds) |
10138 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
10139 | mutex_unlock(&ctx->uring_lock); |
10140 | ||
3dd0c97a PB |
10141 | io_kill_timeouts(ctx, NULL, true); |
10142 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 10143 | |
15dff286 | 10144 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 10145 | io_iopoll_try_reap_events(ctx); |
309fc03a | 10146 | |
85faa7b8 | 10147 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
10148 | /* |
10149 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
10150 | * if we're exiting a ton of rings at the same time. It just adds | |
10151 | * noise and overhead, there's no discernable change in runtime | |
10152 | * over using system_wq. | |
10153 | */ | |
10154 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
10155 | } |
10156 | ||
10157 | static int io_uring_release(struct inode *inode, struct file *file) | |
10158 | { | |
10159 | struct io_ring_ctx *ctx = file->private_data; | |
10160 | ||
10161 | file->private_data = NULL; | |
10162 | io_ring_ctx_wait_and_kill(ctx); | |
10163 | return 0; | |
10164 | } | |
10165 | ||
f6edbabb PB |
10166 | struct io_task_cancel { |
10167 | struct task_struct *task; | |
3dd0c97a | 10168 | bool all; |
f6edbabb | 10169 | }; |
f254ac04 | 10170 | |
f6edbabb | 10171 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 10172 | { |
9a472ef7 | 10173 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 10174 | struct io_task_cancel *cancel = data; |
9a472ef7 | 10175 | |
6af3f48b | 10176 | return io_match_task_safe(req, cancel->task, cancel->all); |
b711d4ea JA |
10177 | } |
10178 | ||
c072481d PB |
10179 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
10180 | struct task_struct *task, | |
10181 | bool cancel_all) | |
b7ddce3c | 10182 | { |
e1915f76 | 10183 | struct io_defer_entry *de; |
b7ddce3c PB |
10184 | LIST_HEAD(list); |
10185 | ||
79ebeaee | 10186 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 10187 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
6af3f48b | 10188 | if (io_match_task_safe(de->req, task, cancel_all)) { |
b7ddce3c PB |
10189 | list_cut_position(&list, &ctx->defer_list, &de->list); |
10190 | break; | |
10191 | } | |
10192 | } | |
79ebeaee | 10193 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
10194 | if (list_empty(&list)) |
10195 | return false; | |
b7ddce3c PB |
10196 | |
10197 | while (!list_empty(&list)) { | |
10198 | de = list_first_entry(&list, struct io_defer_entry, list); | |
10199 | list_del_init(&de->list); | |
f41db273 | 10200 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
10201 | kfree(de); |
10202 | } | |
e1915f76 | 10203 | return true; |
b7ddce3c PB |
10204 | } |
10205 | ||
c072481d | 10206 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
10207 | { |
10208 | struct io_tctx_node *node; | |
10209 | enum io_wq_cancel cret; | |
10210 | bool ret = false; | |
10211 | ||
10212 | mutex_lock(&ctx->uring_lock); | |
10213 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
10214 | struct io_uring_task *tctx = node->task->io_uring; | |
10215 | ||
10216 | /* | |
10217 | * io_wq will stay alive while we hold uring_lock, because it's | |
10218 | * killed after ctx nodes, which requires to take the lock. | |
10219 | */ | |
10220 | if (!tctx || !tctx->io_wq) | |
10221 | continue; | |
10222 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
10223 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
10224 | } | |
10225 | mutex_unlock(&ctx->uring_lock); | |
10226 | ||
10227 | return ret; | |
10228 | } | |
10229 | ||
c072481d PB |
10230 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
10231 | struct task_struct *task, | |
10232 | bool cancel_all) | |
9936c7c2 | 10233 | { |
3dd0c97a | 10234 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 10235 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
10236 | |
10237 | while (1) { | |
10238 | enum io_wq_cancel cret; | |
10239 | bool ret = false; | |
10240 | ||
1b00764f PB |
10241 | if (!task) { |
10242 | ret |= io_uring_try_cancel_iowq(ctx); | |
10243 | } else if (tctx && tctx->io_wq) { | |
10244 | /* | |
10245 | * Cancels requests of all rings, not only @ctx, but | |
10246 | * it's fine as the task is in exit/exec. | |
10247 | */ | |
5aa75ed5 | 10248 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
10249 | &cancel, true); |
10250 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
10251 | } | |
10252 | ||
10253 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 10254 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 10255 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 10256 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
10257 | io_iopoll_try_reap_events(ctx); |
10258 | ret = true; | |
10259 | } | |
10260 | } | |
10261 | ||
3dd0c97a PB |
10262 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
10263 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
10264 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
10265 | if (task) |
10266 | ret |= io_run_task_work(); | |
9936c7c2 PB |
10267 | if (!ret) |
10268 | break; | |
10269 | cond_resched(); | |
10270 | } | |
10271 | } | |
10272 | ||
eef51daa | 10273 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 10274 | { |
236434c3 | 10275 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 10276 | struct io_tctx_node *node; |
a528b04e | 10277 | int ret; |
236434c3 MWO |
10278 | |
10279 | if (unlikely(!tctx)) { | |
5aa75ed5 | 10280 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
10281 | if (unlikely(ret)) |
10282 | return ret; | |
e139a1ec | 10283 | |
236434c3 | 10284 | tctx = current->io_uring; |
e139a1ec PB |
10285 | if (ctx->iowq_limits_set) { |
10286 | unsigned int limits[2] = { ctx->iowq_limits[0], | |
10287 | ctx->iowq_limits[1], }; | |
10288 | ||
10289 | ret = io_wq_max_workers(tctx->io_wq, limits); | |
10290 | if (ret) | |
10291 | return ret; | |
10292 | } | |
0f212204 | 10293 | } |
cf27f3b1 PB |
10294 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
10295 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
10296 | if (!node) | |
10297 | return -ENOMEM; | |
10298 | node->ctx = ctx; | |
10299 | node->task = current; | |
13bf43f5 | 10300 | |
cf27f3b1 PB |
10301 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
10302 | node, GFP_KERNEL)); | |
10303 | if (ret) { | |
10304 | kfree(node); | |
10305 | return ret; | |
0f212204 | 10306 | } |
cf27f3b1 PB |
10307 | |
10308 | mutex_lock(&ctx->uring_lock); | |
10309 | list_add(&node->ctx_node, &ctx->tctx_list); | |
10310 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 10311 | } |
cf27f3b1 | 10312 | tctx->last = ctx; |
0f212204 JA |
10313 | return 0; |
10314 | } | |
10315 | ||
cf27f3b1 PB |
10316 | /* |
10317 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
10318 | */ | |
eef51daa | 10319 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
10320 | { |
10321 | struct io_uring_task *tctx = current->io_uring; | |
10322 | ||
10323 | if (likely(tctx && tctx->last == ctx)) | |
10324 | return 0; | |
eef51daa | 10325 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
10326 | } |
10327 | ||
0f212204 JA |
10328 | /* |
10329 | * Remove this io_uring_file -> task mapping. | |
10330 | */ | |
c072481d | 10331 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
10332 | { |
10333 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 10334 | struct io_tctx_node *node; |
2941267b | 10335 | |
eebd2e37 PB |
10336 | if (!tctx) |
10337 | return; | |
13bf43f5 PB |
10338 | node = xa_erase(&tctx->xa, index); |
10339 | if (!node) | |
2941267b | 10340 | return; |
0f212204 | 10341 | |
13bf43f5 PB |
10342 | WARN_ON_ONCE(current != node->task); |
10343 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
10344 | ||
10345 | mutex_lock(&node->ctx->uring_lock); | |
10346 | list_del(&node->ctx_node); | |
10347 | mutex_unlock(&node->ctx->uring_lock); | |
10348 | ||
baf186c4 | 10349 | if (tctx->last == node->ctx) |
0f212204 | 10350 | tctx->last = NULL; |
13bf43f5 | 10351 | kfree(node); |
0f212204 JA |
10352 | } |
10353 | ||
c072481d | 10354 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 10355 | { |
ba5ef6dc | 10356 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 10357 | struct io_tctx_node *node; |
de7f1d9e PB |
10358 | unsigned long index; |
10359 | ||
8bab4c09 | 10360 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 10361 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
10362 | cond_resched(); |
10363 | } | |
b16ef427 ME |
10364 | if (wq) { |
10365 | /* | |
f6f9b278 | 10366 | * Must be after io_uring_del_tctx_node() (removes nodes under |
b16ef427 ME |
10367 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). |
10368 | */ | |
ba5ef6dc | 10369 | io_wq_put_and_exit(wq); |
dadebc35 | 10370 | tctx->io_wq = NULL; |
b16ef427 | 10371 | } |
de7f1d9e PB |
10372 | } |
10373 | ||
3f48cf18 | 10374 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 10375 | { |
3f48cf18 | 10376 | if (tracked) |
d5361233 | 10377 | return 0; |
521d6a73 PB |
10378 | return percpu_counter_sum(&tctx->inflight); |
10379 | } | |
10380 | ||
78cc687b PB |
10381 | /* |
10382 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
78a78060 | 10383 | * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. |
78cc687b | 10384 | */ |
c072481d PB |
10385 | static __cold void io_uring_cancel_generic(bool cancel_all, |
10386 | struct io_sq_data *sqd) | |
0e9ddb39 | 10387 | { |
521d6a73 | 10388 | struct io_uring_task *tctx = current->io_uring; |
734551df | 10389 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
10390 | s64 inflight; |
10391 | DEFINE_WAIT(wait); | |
fdaf083c | 10392 | |
78cc687b PB |
10393 | WARN_ON_ONCE(sqd && sqd->thread != current); |
10394 | ||
6d042ffb PO |
10395 | if (!current->io_uring) |
10396 | return; | |
17a91051 PB |
10397 | if (tctx->io_wq) |
10398 | io_wq_exit_start(tctx->io_wq); | |
10399 | ||
0e9ddb39 PB |
10400 | atomic_inc(&tctx->in_idle); |
10401 | do { | |
e9dbe221 | 10402 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 10403 | /* read completions before cancelations */ |
78cc687b | 10404 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
10405 | if (!inflight) |
10406 | break; | |
fdaf083c | 10407 | |
78cc687b PB |
10408 | if (!sqd) { |
10409 | struct io_tctx_node *node; | |
10410 | unsigned long index; | |
0f212204 | 10411 | |
78cc687b PB |
10412 | xa_for_each(&tctx->xa, index, node) { |
10413 | /* sqpoll task will cancel all its requests */ | |
10414 | if (node->ctx->sq_data) | |
10415 | continue; | |
10416 | io_uring_try_cancel_requests(node->ctx, current, | |
10417 | cancel_all); | |
10418 | } | |
10419 | } else { | |
10420 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
10421 | io_uring_try_cancel_requests(ctx, current, | |
10422 | cancel_all); | |
10423 | } | |
17a91051 | 10424 | |
78a78060 JA |
10425 | prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE); |
10426 | io_run_task_work(); | |
e9dbe221 | 10427 | io_uring_drop_tctx_refs(current); |
78a78060 | 10428 | |
0f212204 | 10429 | /* |
a1bb3cd5 PB |
10430 | * If we've seen completions, retry without waiting. This |
10431 | * avoids a race where a completion comes in before we did | |
10432 | * prepare_to_wait(). | |
0f212204 | 10433 | */ |
3dd0c97a | 10434 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 10435 | schedule(); |
f57555ed | 10436 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 10437 | } while (1); |
de7f1d9e | 10438 | |
8452d4a6 | 10439 | io_uring_clean_tctx(tctx); |
3dd0c97a | 10440 | if (cancel_all) { |
3cc7fdb9 PB |
10441 | /* |
10442 | * We shouldn't run task_works after cancel, so just leave | |
10443 | * ->in_idle set for normal exit. | |
10444 | */ | |
10445 | atomic_dec(&tctx->in_idle); | |
3f48cf18 PB |
10446 | /* for exec all current's requests should be gone, kill tctx */ |
10447 | __io_uring_free(current); | |
10448 | } | |
44e728b8 PB |
10449 | } |
10450 | ||
f552a27a | 10451 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 10452 | { |
f552a27a | 10453 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
10454 | } |
10455 | ||
e7a6c00d JA |
10456 | void io_uring_unreg_ringfd(void) |
10457 | { | |
10458 | struct io_uring_task *tctx = current->io_uring; | |
10459 | int i; | |
10460 | ||
10461 | for (i = 0; i < IO_RINGFD_REG_MAX; i++) { | |
10462 | if (tctx->registered_rings[i]) { | |
10463 | fput(tctx->registered_rings[i]); | |
10464 | tctx->registered_rings[i] = NULL; | |
10465 | } | |
10466 | } | |
10467 | } | |
10468 | ||
10469 | static int io_ring_add_registered_fd(struct io_uring_task *tctx, int fd, | |
10470 | int start, int end) | |
10471 | { | |
10472 | struct file *file; | |
10473 | int offset; | |
10474 | ||
10475 | for (offset = start; offset < end; offset++) { | |
10476 | offset = array_index_nospec(offset, IO_RINGFD_REG_MAX); | |
10477 | if (tctx->registered_rings[offset]) | |
10478 | continue; | |
10479 | ||
10480 | file = fget(fd); | |
10481 | if (!file) { | |
10482 | return -EBADF; | |
10483 | } else if (file->f_op != &io_uring_fops) { | |
10484 | fput(file); | |
10485 | return -EOPNOTSUPP; | |
10486 | } | |
10487 | tctx->registered_rings[offset] = file; | |
10488 | return offset; | |
10489 | } | |
10490 | ||
10491 | return -EBUSY; | |
10492 | } | |
10493 | ||
10494 | /* | |
10495 | * Register a ring fd to avoid fdget/fdput for each io_uring_enter() | |
10496 | * invocation. User passes in an array of struct io_uring_rsrc_update | |
10497 | * with ->data set to the ring_fd, and ->offset given for the desired | |
10498 | * index. If no index is desired, application may set ->offset == -1U | |
10499 | * and we'll find an available index. Returns number of entries | |
10500 | * successfully processed, or < 0 on error if none were processed. | |
10501 | */ | |
10502 | static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg, | |
10503 | unsigned nr_args) | |
10504 | { | |
10505 | struct io_uring_rsrc_update __user *arg = __arg; | |
10506 | struct io_uring_rsrc_update reg; | |
10507 | struct io_uring_task *tctx; | |
10508 | int ret, i; | |
10509 | ||
10510 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
10511 | return -EINVAL; | |
10512 | ||
10513 | mutex_unlock(&ctx->uring_lock); | |
10514 | ret = io_uring_add_tctx_node(ctx); | |
10515 | mutex_lock(&ctx->uring_lock); | |
10516 | if (ret) | |
10517 | return ret; | |
10518 | ||
10519 | tctx = current->io_uring; | |
10520 | for (i = 0; i < nr_args; i++) { | |
10521 | int start, end; | |
10522 | ||
10523 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
10524 | ret = -EFAULT; | |
10525 | break; | |
10526 | } | |
10527 | ||
10528 | if (reg.offset == -1U) { | |
10529 | start = 0; | |
10530 | end = IO_RINGFD_REG_MAX; | |
10531 | } else { | |
10532 | if (reg.offset >= IO_RINGFD_REG_MAX) { | |
10533 | ret = -EINVAL; | |
10534 | break; | |
10535 | } | |
10536 | start = reg.offset; | |
10537 | end = start + 1; | |
10538 | } | |
10539 | ||
10540 | ret = io_ring_add_registered_fd(tctx, reg.data, start, end); | |
10541 | if (ret < 0) | |
10542 | break; | |
10543 | ||
10544 | reg.offset = ret; | |
10545 | if (copy_to_user(&arg[i], ®, sizeof(reg))) { | |
10546 | fput(tctx->registered_rings[reg.offset]); | |
10547 | tctx->registered_rings[reg.offset] = NULL; | |
10548 | ret = -EFAULT; | |
10549 | break; | |
10550 | } | |
10551 | } | |
10552 | ||
10553 | return i ? i : ret; | |
10554 | } | |
10555 | ||
10556 | static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg, | |
10557 | unsigned nr_args) | |
10558 | { | |
10559 | struct io_uring_rsrc_update __user *arg = __arg; | |
10560 | struct io_uring_task *tctx = current->io_uring; | |
10561 | struct io_uring_rsrc_update reg; | |
10562 | int ret = 0, i; | |
10563 | ||
10564 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
10565 | return -EINVAL; | |
10566 | if (!tctx) | |
10567 | return 0; | |
10568 | ||
10569 | for (i = 0; i < nr_args; i++) { | |
10570 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
10571 | ret = -EFAULT; | |
10572 | break; | |
10573 | } | |
10574 | if (reg.offset >= IO_RINGFD_REG_MAX) { | |
10575 | ret = -EINVAL; | |
10576 | break; | |
10577 | } | |
10578 | ||
10579 | reg.offset = array_index_nospec(reg.offset, IO_RINGFD_REG_MAX); | |
10580 | if (tctx->registered_rings[reg.offset]) { | |
10581 | fput(tctx->registered_rings[reg.offset]); | |
10582 | tctx->registered_rings[reg.offset] = NULL; | |
10583 | } | |
10584 | } | |
10585 | ||
10586 | return i ? i : ret; | |
10587 | } | |
10588 | ||
6c5c240e RP |
10589 | static void *io_uring_validate_mmap_request(struct file *file, |
10590 | loff_t pgoff, size_t sz) | |
2b188cc1 | 10591 | { |
2b188cc1 | 10592 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 10593 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
10594 | struct page *page; |
10595 | void *ptr; | |
10596 | ||
10597 | switch (offset) { | |
10598 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
10599 | case IORING_OFF_CQ_RING: |
10600 | ptr = ctx->rings; | |
2b188cc1 JA |
10601 | break; |
10602 | case IORING_OFF_SQES: | |
10603 | ptr = ctx->sq_sqes; | |
10604 | break; | |
2b188cc1 | 10605 | default: |
6c5c240e | 10606 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
10607 | } |
10608 | ||
10609 | page = virt_to_head_page(ptr); | |
a50b854e | 10610 | if (sz > page_size(page)) |
6c5c240e RP |
10611 | return ERR_PTR(-EINVAL); |
10612 | ||
10613 | return ptr; | |
10614 | } | |
10615 | ||
10616 | #ifdef CONFIG_MMU | |
10617 | ||
c072481d | 10618 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
10619 | { |
10620 | size_t sz = vma->vm_end - vma->vm_start; | |
10621 | unsigned long pfn; | |
10622 | void *ptr; | |
10623 | ||
10624 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
10625 | if (IS_ERR(ptr)) | |
10626 | return PTR_ERR(ptr); | |
2b188cc1 JA |
10627 | |
10628 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
10629 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
10630 | } | |
10631 | ||
6c5c240e RP |
10632 | #else /* !CONFIG_MMU */ |
10633 | ||
10634 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
10635 | { | |
10636 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
10637 | } | |
10638 | ||
10639 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
10640 | { | |
10641 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
10642 | } | |
10643 | ||
10644 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
10645 | unsigned long addr, unsigned long len, | |
10646 | unsigned long pgoff, unsigned long flags) | |
10647 | { | |
10648 | void *ptr; | |
10649 | ||
10650 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
10651 | if (IS_ERR(ptr)) | |
10652 | return PTR_ERR(ptr); | |
10653 | ||
10654 | return (unsigned long) ptr; | |
10655 | } | |
10656 | ||
10657 | #endif /* !CONFIG_MMU */ | |
10658 | ||
d9d05217 | 10659 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
10660 | { |
10661 | DEFINE_WAIT(wait); | |
10662 | ||
10663 | do { | |
10664 | if (!io_sqring_full(ctx)) | |
10665 | break; | |
90554200 JA |
10666 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
10667 | ||
10668 | if (!io_sqring_full(ctx)) | |
10669 | break; | |
90554200 JA |
10670 | schedule(); |
10671 | } while (!signal_pending(current)); | |
10672 | ||
10673 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 10674 | return 0; |
90554200 JA |
10675 | } |
10676 | ||
c73ebb68 HX |
10677 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
10678 | struct __kernel_timespec __user **ts, | |
10679 | const sigset_t __user **sig) | |
10680 | { | |
10681 | struct io_uring_getevents_arg arg; | |
10682 | ||
10683 | /* | |
10684 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
10685 | * is just a pointer to the sigset_t. | |
10686 | */ | |
10687 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
10688 | *sig = (const sigset_t __user *) argp; | |
10689 | *ts = NULL; | |
10690 | return 0; | |
10691 | } | |
10692 | ||
10693 | /* | |
10694 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
10695 | * timespec and sigset_t pointers if good. | |
10696 | */ | |
10697 | if (*argsz != sizeof(arg)) | |
10698 | return -EINVAL; | |
10699 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
10700 | return -EFAULT; | |
10701 | *sig = u64_to_user_ptr(arg.sigmask); | |
10702 | *argsz = arg.sigmask_sz; | |
10703 | *ts = u64_to_user_ptr(arg.ts); | |
10704 | return 0; | |
10705 | } | |
10706 | ||
2b188cc1 | 10707 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
10708 | u32, min_complete, u32, flags, const void __user *, argp, |
10709 | size_t, argsz) | |
2b188cc1 JA |
10710 | { |
10711 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
10712 | int submitted = 0; |
10713 | struct fd f; | |
33f993da | 10714 | long ret; |
2b188cc1 | 10715 | |
4c6e277c | 10716 | io_run_task_work(); |
b41e9852 | 10717 | |
33f993da | 10718 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
e7a6c00d JA |
10719 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG | |
10720 | IORING_ENTER_REGISTERED_RING))) | |
2b188cc1 JA |
10721 | return -EINVAL; |
10722 | ||
e7a6c00d JA |
10723 | /* |
10724 | * Ring fd has been registered via IORING_REGISTER_RING_FDS, we | |
10725 | * need only dereference our task private array to find it. | |
10726 | */ | |
10727 | if (flags & IORING_ENTER_REGISTERED_RING) { | |
10728 | struct io_uring_task *tctx = current->io_uring; | |
10729 | ||
10730 | if (!tctx || fd >= IO_RINGFD_REG_MAX) | |
10731 | return -EINVAL; | |
10732 | fd = array_index_nospec(fd, IO_RINGFD_REG_MAX); | |
10733 | f.file = tctx->registered_rings[fd]; | |
10734 | if (unlikely(!f.file)) | |
10735 | return -EBADF; | |
10736 | } else { | |
10737 | f = fdget(fd); | |
10738 | if (unlikely(!f.file)) | |
10739 | return -EBADF; | |
10740 | } | |
2b188cc1 JA |
10741 | |
10742 | ret = -EOPNOTSUPP; | |
33f993da | 10743 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
10744 | goto out_fput; |
10745 | ||
10746 | ret = -ENXIO; | |
10747 | ctx = f.file->private_data; | |
33f993da | 10748 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
10749 | goto out_fput; |
10750 | ||
7e84e1c7 | 10751 | ret = -EBADFD; |
33f993da | 10752 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
10753 | goto out; |
10754 | ||
6c271ce2 JA |
10755 | /* |
10756 | * For SQ polling, the thread will do all submissions and completions. | |
10757 | * Just return the requested submit count, and wake the thread if | |
10758 | * we were asked to. | |
10759 | */ | |
b2a9eada | 10760 | ret = 0; |
6c271ce2 | 10761 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 10762 | io_cqring_overflow_flush(ctx); |
89448c47 | 10763 | |
21f96522 JA |
10764 | if (unlikely(ctx->sq_data->thread == NULL)) { |
10765 | ret = -EOWNERDEAD; | |
04147488 | 10766 | goto out; |
21f96522 | 10767 | } |
6c271ce2 | 10768 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 10769 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
10770 | if (flags & IORING_ENTER_SQ_WAIT) { |
10771 | ret = io_sqpoll_wait_sq(ctx); | |
10772 | if (ret) | |
10773 | goto out; | |
10774 | } | |
6c271ce2 | 10775 | submitted = to_submit; |
b2a9eada | 10776 | } else if (to_submit) { |
eef51daa | 10777 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
10778 | if (unlikely(ret)) |
10779 | goto out; | |
2b188cc1 | 10780 | mutex_lock(&ctx->uring_lock); |
0f212204 | 10781 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 10782 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
10783 | |
10784 | if (submitted != to_submit) | |
10785 | goto out; | |
2b188cc1 JA |
10786 | } |
10787 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
10788 | const sigset_t __user *sig; |
10789 | struct __kernel_timespec __user *ts; | |
10790 | ||
10791 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
10792 | if (unlikely(ret)) | |
10793 | goto out; | |
10794 | ||
2b188cc1 JA |
10795 | min_complete = min(min_complete, ctx->cq_entries); |
10796 | ||
32b2244a XW |
10797 | /* |
10798 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
10799 | * space applications don't need to do io completion events | |
10800 | * polling again, they can rely on io_sq_thread to do polling | |
10801 | * work, which can reduce cpu usage and uring_lock contention. | |
10802 | */ | |
10803 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
10804 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 10805 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 10806 | } else { |
c73ebb68 | 10807 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 10808 | } |
2b188cc1 JA |
10809 | } |
10810 | ||
7c504e65 | 10811 | out: |
6805b32e | 10812 | percpu_ref_put(&ctx->refs); |
2b188cc1 | 10813 | out_fput: |
e7a6c00d JA |
10814 | if (!(flags & IORING_ENTER_REGISTERED_RING)) |
10815 | fdput(f); | |
2b188cc1 JA |
10816 | return submitted ? submitted : ret; |
10817 | } | |
10818 | ||
bebdb65e | 10819 | #ifdef CONFIG_PROC_FS |
c072481d | 10820 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 10821 | const struct cred *cred) |
87ce955b | 10822 | { |
87ce955b JA |
10823 | struct user_namespace *uns = seq_user_ns(m); |
10824 | struct group_info *gi; | |
10825 | kernel_cap_t cap; | |
10826 | unsigned __capi; | |
10827 | int g; | |
10828 | ||
10829 | seq_printf(m, "%5d\n", id); | |
10830 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
10831 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
10832 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
10833 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10834 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10835 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10836 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10837 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10838 | seq_puts(m, "\n\tGroups:\t"); | |
10839 | gi = cred->group_info; | |
10840 | for (g = 0; g < gi->ngroups; g++) { | |
10841 | seq_put_decimal_ull(m, g ? " " : "", | |
10842 | from_kgid_munged(uns, gi->gid[g])); | |
10843 | } | |
10844 | seq_puts(m, "\n\tCapEff:\t"); | |
10845 | cap = cred->cap_effective; | |
10846 | CAP_FOR_EACH_U32(__capi) | |
10847 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10848 | seq_putc(m, '\n'); | |
10849 | return 0; | |
10850 | } | |
10851 | ||
c072481d PB |
10852 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
10853 | struct seq_file *m) | |
87ce955b | 10854 | { |
dbbe9c64 | 10855 | struct io_sq_data *sq = NULL; |
83f84356 HX |
10856 | struct io_overflow_cqe *ocqe; |
10857 | struct io_rings *r = ctx->rings; | |
10858 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
83f84356 HX |
10859 | unsigned int sq_head = READ_ONCE(r->sq.head); |
10860 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
10861 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
10862 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
f75d1183 | 10863 | unsigned int sq_entries, cq_entries; |
fad8e0de | 10864 | bool has_lock; |
83f84356 HX |
10865 | unsigned int i; |
10866 | ||
10867 | /* | |
10868 | * we may get imprecise sqe and cqe info if uring is actively running | |
10869 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
10870 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
10871 | * we usually use these info when it is stuck. | |
10872 | */ | |
c0235652 | 10873 | seq_printf(m, "SqMask:\t0x%x\n", sq_mask); |
f75d1183 JA |
10874 | seq_printf(m, "SqHead:\t%u\n", sq_head); |
10875 | seq_printf(m, "SqTail:\t%u\n", sq_tail); | |
10876 | seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head); | |
10877 | seq_printf(m, "CqMask:\t0x%x\n", cq_mask); | |
10878 | seq_printf(m, "CqHead:\t%u\n", cq_head); | |
10879 | seq_printf(m, "CqTail:\t%u\n", cq_tail); | |
10880 | seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail); | |
10881 | seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head); | |
10882 | sq_entries = min(sq_tail - sq_head, ctx->sq_entries); | |
10883 | for (i = 0; i < sq_entries; i++) { | |
10884 | unsigned int entry = i + sq_head; | |
10885 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); | |
a1957780 | 10886 | struct io_uring_sqe *sqe; |
f75d1183 JA |
10887 | |
10888 | if (sq_idx > sq_mask) | |
10889 | continue; | |
10890 | sqe = &ctx->sq_sqes[sq_idx]; | |
10891 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
10892 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, | |
10893 | sqe->user_data); | |
83f84356 | 10894 | } |
f75d1183 JA |
10895 | seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); |
10896 | cq_entries = min(cq_tail - cq_head, ctx->cq_entries); | |
10897 | for (i = 0; i < cq_entries; i++) { | |
10898 | unsigned int entry = i + cq_head; | |
10899 | struct io_uring_cqe *cqe = &r->cqes[entry & cq_mask]; | |
83f84356 HX |
10900 | |
10901 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
f75d1183 JA |
10902 | entry & cq_mask, cqe->user_data, cqe->res, |
10903 | cqe->flags); | |
83f84356 | 10904 | } |
87ce955b | 10905 | |
fad8e0de JA |
10906 | /* |
10907 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10908 | * since fdinfo case grabs it in the opposite direction of normal use | |
10909 | * cases. If we fail to get the lock, we just don't iterate any | |
10910 | * structures that could be going away outside the io_uring mutex. | |
10911 | */ | |
10912 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10913 | ||
5f3f26f9 | 10914 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10915 | sq = ctx->sq_data; |
5f3f26f9 JA |
10916 | if (!sq->thread) |
10917 | sq = NULL; | |
10918 | } | |
dbbe9c64 JQ |
10919 | |
10920 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10921 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10922 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10923 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10924 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10925 | |
87ce955b JA |
10926 | if (f) |
10927 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10928 | else | |
10929 | seq_printf(m, "%5u: <none>\n", i); | |
10930 | } | |
10931 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10932 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10933 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10934 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10935 | |
4751f53d | 10936 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10937 | } |
61cf9370 MWO |
10938 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10939 | unsigned long index; | |
10940 | const struct cred *cred; | |
10941 | ||
87ce955b | 10942 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10943 | xa_for_each(&ctx->personalities, index, cred) |
10944 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10945 | } |
83f84356 HX |
10946 | if (has_lock) |
10947 | mutex_unlock(&ctx->uring_lock); | |
10948 | ||
10949 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 10950 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10951 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10952 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10953 | struct io_kiocb *req; | |
10954 | ||
10955 | hlist_for_each_entry(req, list, hash_node) | |
10956 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7f62d40d | 10957 | task_work_pending(req->task)); |
d7718a9d | 10958 | } |
83f84356 HX |
10959 | |
10960 | seq_puts(m, "CqOverflowList:\n"); | |
10961 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
10962 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
10963 | ||
10964 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
10965 | cqe->user_data, cqe->res, cqe->flags); | |
10966 | ||
10967 | } | |
10968 | ||
79ebeaee | 10969 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
10970 | } |
10971 | ||
c072481d | 10972 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
10973 | { |
10974 | struct io_ring_ctx *ctx = f->private_data; | |
10975 | ||
10976 | if (percpu_ref_tryget(&ctx->refs)) { | |
10977 | __io_uring_show_fdinfo(ctx, m); | |
10978 | percpu_ref_put(&ctx->refs); | |
10979 | } | |
10980 | } | |
bebdb65e | 10981 | #endif |
87ce955b | 10982 | |
2b188cc1 JA |
10983 | static const struct file_operations io_uring_fops = { |
10984 | .release = io_uring_release, | |
10985 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10986 | #ifndef CONFIG_MMU |
10987 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10988 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10989 | #endif | |
2b188cc1 | 10990 | .poll = io_uring_poll, |
bebdb65e | 10991 | #ifdef CONFIG_PROC_FS |
87ce955b | 10992 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10993 | #endif |
2b188cc1 JA |
10994 | }; |
10995 | ||
c072481d PB |
10996 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
10997 | struct io_uring_params *p) | |
2b188cc1 | 10998 | { |
75b28aff HV |
10999 | struct io_rings *rings; |
11000 | size_t size, sq_array_offset; | |
2b188cc1 | 11001 | |
bd740481 JA |
11002 | /* make sure these are sane, as we already accounted them */ |
11003 | ctx->sq_entries = p->sq_entries; | |
11004 | ctx->cq_entries = p->cq_entries; | |
11005 | ||
75b28aff HV |
11006 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
11007 | if (size == SIZE_MAX) | |
11008 | return -EOVERFLOW; | |
11009 | ||
11010 | rings = io_mem_alloc(size); | |
11011 | if (!rings) | |
2b188cc1 JA |
11012 | return -ENOMEM; |
11013 | ||
75b28aff HV |
11014 | ctx->rings = rings; |
11015 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
11016 | rings->sq_ring_mask = p->sq_entries - 1; | |
11017 | rings->cq_ring_mask = p->cq_entries - 1; | |
11018 | rings->sq_ring_entries = p->sq_entries; | |
11019 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
11020 | |
11021 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
11022 | if (size == SIZE_MAX) { |
11023 | io_mem_free(ctx->rings); | |
11024 | ctx->rings = NULL; | |
2b188cc1 | 11025 | return -EOVERFLOW; |
eb065d30 | 11026 | } |
2b188cc1 JA |
11027 | |
11028 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
11029 | if (!ctx->sq_sqes) { |
11030 | io_mem_free(ctx->rings); | |
11031 | ctx->rings = NULL; | |
2b188cc1 | 11032 | return -ENOMEM; |
eb065d30 | 11033 | } |
2b188cc1 | 11034 | |
2b188cc1 JA |
11035 | return 0; |
11036 | } | |
11037 | ||
9faadcc8 PB |
11038 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
11039 | { | |
11040 | int ret, fd; | |
11041 | ||
11042 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
11043 | if (fd < 0) | |
11044 | return fd; | |
11045 | ||
eef51daa | 11046 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
11047 | if (ret) { |
11048 | put_unused_fd(fd); | |
11049 | return ret; | |
11050 | } | |
11051 | fd_install(fd, file); | |
11052 | return fd; | |
11053 | } | |
11054 | ||
2b188cc1 JA |
11055 | /* |
11056 | * Allocate an anonymous fd, this is what constitutes the application | |
11057 | * visible backing of an io_uring instance. The application mmaps this | |
11058 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
11059 | * we have to tie this fd to a socket for file garbage collection purposes. | |
11060 | */ | |
9faadcc8 | 11061 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
11062 | { |
11063 | struct file *file; | |
9faadcc8 | 11064 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
11065 | int ret; |
11066 | ||
2b188cc1 JA |
11067 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
11068 | &ctx->ring_sock); | |
11069 | if (ret) | |
9faadcc8 | 11070 | return ERR_PTR(ret); |
2b188cc1 JA |
11071 | #endif |
11072 | ||
91a9ab7c PM |
11073 | file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx, |
11074 | O_RDWR | O_CLOEXEC, NULL); | |
2b188cc1 | 11075 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
11076 | if (IS_ERR(file)) { |
11077 | sock_release(ctx->ring_sock); | |
11078 | ctx->ring_sock = NULL; | |
11079 | } else { | |
11080 | ctx->ring_sock->file = file; | |
0f212204 | 11081 | } |
2b188cc1 | 11082 | #endif |
9faadcc8 | 11083 | return file; |
2b188cc1 JA |
11084 | } |
11085 | ||
c072481d PB |
11086 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
11087 | struct io_uring_params __user *params) | |
2b188cc1 | 11088 | { |
2b188cc1 | 11089 | struct io_ring_ctx *ctx; |
9faadcc8 | 11090 | struct file *file; |
2b188cc1 JA |
11091 | int ret; |
11092 | ||
8110c1a6 | 11093 | if (!entries) |
2b188cc1 | 11094 | return -EINVAL; |
8110c1a6 JA |
11095 | if (entries > IORING_MAX_ENTRIES) { |
11096 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
11097 | return -EINVAL; | |
11098 | entries = IORING_MAX_ENTRIES; | |
11099 | } | |
2b188cc1 JA |
11100 | |
11101 | /* | |
11102 | * Use twice as many entries for the CQ ring. It's possible for the | |
11103 | * application to drive a higher depth than the size of the SQ ring, | |
11104 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
11105 | * some flexibility in overcommitting a bit. If the application has |
11106 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
11107 | * of CQ ring entries manually. | |
2b188cc1 JA |
11108 | */ |
11109 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
11110 | if (p->flags & IORING_SETUP_CQSIZE) { |
11111 | /* | |
11112 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
11113 | * to a power-of-two, if it isn't already. We do NOT impose | |
11114 | * any cq vs sq ring sizing. | |
11115 | */ | |
eb2667b3 | 11116 | if (!p->cq_entries) |
33a107f0 | 11117 | return -EINVAL; |
8110c1a6 JA |
11118 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
11119 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
11120 | return -EINVAL; | |
11121 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
11122 | } | |
eb2667b3 JQ |
11123 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
11124 | if (p->cq_entries < p->sq_entries) | |
11125 | return -EINVAL; | |
33a107f0 JA |
11126 | } else { |
11127 | p->cq_entries = 2 * p->sq_entries; | |
11128 | } | |
2b188cc1 | 11129 | |
2b188cc1 | 11130 | ctx = io_ring_ctx_alloc(p); |
62e398be | 11131 | if (!ctx) |
2b188cc1 | 11132 | return -ENOMEM; |
2b188cc1 | 11133 | ctx->compat = in_compat_syscall(); |
62e398be JA |
11134 | if (!capable(CAP_IPC_LOCK)) |
11135 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
11136 | |
11137 | /* | |
11138 | * This is just grabbed for accounting purposes. When a process exits, | |
11139 | * the mm is exited and dropped before the files, hence we need to hang | |
11140 | * on to this mm purely for the purposes of being able to unaccount | |
11141 | * memory (locked/pinned vm). It's not used for anything else. | |
11142 | */ | |
6b7898eb | 11143 | mmgrab(current->mm); |
2aede0e4 | 11144 | ctx->mm_account = current->mm; |
6b7898eb | 11145 | |
2b188cc1 JA |
11146 | ret = io_allocate_scq_urings(ctx, p); |
11147 | if (ret) | |
11148 | goto err; | |
11149 | ||
7e84e1c7 | 11150 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
11151 | if (ret) |
11152 | goto err; | |
eae071c9 | 11153 | /* always set a rsrc node */ |
47b228ce PB |
11154 | ret = io_rsrc_node_switch_start(ctx); |
11155 | if (ret) | |
11156 | goto err; | |
eae071c9 | 11157 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 11158 | |
2b188cc1 | 11159 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
11160 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
11161 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
11162 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
11163 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
11164 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
11165 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
11166 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
11167 | |
11168 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
11169 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
11170 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
11171 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
11172 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
11173 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
11174 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 11175 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 11176 | |
7f13657d XW |
11177 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
11178 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 11179 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 11180 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e | 11181 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
04c76b41 | 11182 | IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP; |
7f13657d XW |
11183 | |
11184 | if (copy_to_user(params, p, sizeof(*p))) { | |
11185 | ret = -EFAULT; | |
11186 | goto err; | |
11187 | } | |
d1719f70 | 11188 | |
9faadcc8 PB |
11189 | file = io_uring_get_file(ctx); |
11190 | if (IS_ERR(file)) { | |
11191 | ret = PTR_ERR(file); | |
11192 | goto err; | |
11193 | } | |
11194 | ||
044c1ab3 JA |
11195 | /* |
11196 | * Install ring fd as the very last thing, so we don't risk someone | |
11197 | * having closed it before we finish setup | |
11198 | */ | |
9faadcc8 PB |
11199 | ret = io_uring_install_fd(ctx, file); |
11200 | if (ret < 0) { | |
11201 | /* fput will clean it up */ | |
11202 | fput(file); | |
11203 | return ret; | |
11204 | } | |
044c1ab3 | 11205 | |
c826bd7a | 11206 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
11207 | return ret; |
11208 | err: | |
11209 | io_ring_ctx_wait_and_kill(ctx); | |
11210 | return ret; | |
11211 | } | |
11212 | ||
11213 | /* | |
11214 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
11215 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
11216 | * params structure passed in. | |
11217 | */ | |
11218 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
11219 | { | |
11220 | struct io_uring_params p; | |
2b188cc1 JA |
11221 | int i; |
11222 | ||
11223 | if (copy_from_user(&p, params, sizeof(p))) | |
11224 | return -EFAULT; | |
11225 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
11226 | if (p.resv[i]) | |
11227 | return -EINVAL; | |
11228 | } | |
11229 | ||
6c271ce2 | 11230 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 11231 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 | 11232 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
bcbb7bf6 | 11233 | IORING_SETUP_R_DISABLED | IORING_SETUP_SUBMIT_ALL)) |
2b188cc1 JA |
11234 | return -EINVAL; |
11235 | ||
7f13657d | 11236 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
11237 | } |
11238 | ||
11239 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
11240 | struct io_uring_params __user *, params) | |
11241 | { | |
11242 | return io_uring_setup(entries, params); | |
11243 | } | |
11244 | ||
c072481d PB |
11245 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
11246 | unsigned nr_args) | |
66f4af93 JA |
11247 | { |
11248 | struct io_uring_probe *p; | |
11249 | size_t size; | |
11250 | int i, ret; | |
11251 | ||
11252 | size = struct_size(p, ops, nr_args); | |
11253 | if (size == SIZE_MAX) | |
11254 | return -EOVERFLOW; | |
11255 | p = kzalloc(size, GFP_KERNEL); | |
11256 | if (!p) | |
11257 | return -ENOMEM; | |
11258 | ||
11259 | ret = -EFAULT; | |
11260 | if (copy_from_user(p, arg, size)) | |
11261 | goto out; | |
11262 | ret = -EINVAL; | |
11263 | if (memchr_inv(p, 0, size)) | |
11264 | goto out; | |
11265 | ||
11266 | p->last_op = IORING_OP_LAST - 1; | |
11267 | if (nr_args > IORING_OP_LAST) | |
11268 | nr_args = IORING_OP_LAST; | |
11269 | ||
11270 | for (i = 0; i < nr_args; i++) { | |
11271 | p->ops[i].op = i; | |
11272 | if (!io_op_defs[i].not_supported) | |
11273 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
11274 | } | |
11275 | p->ops_len = i; | |
11276 | ||
11277 | ret = 0; | |
11278 | if (copy_to_user(arg, p, size)) | |
11279 | ret = -EFAULT; | |
11280 | out: | |
11281 | kfree(p); | |
11282 | return ret; | |
11283 | } | |
11284 | ||
071698e1 JA |
11285 | static int io_register_personality(struct io_ring_ctx *ctx) |
11286 | { | |
4379bf8b | 11287 | const struct cred *creds; |
61cf9370 | 11288 | u32 id; |
1e6fa521 | 11289 | int ret; |
071698e1 | 11290 | |
4379bf8b | 11291 | creds = get_current_cred(); |
1e6fa521 | 11292 | |
61cf9370 MWO |
11293 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
11294 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
11295 | if (ret < 0) { |
11296 | put_cred(creds); | |
11297 | return ret; | |
11298 | } | |
11299 | return id; | |
071698e1 JA |
11300 | } |
11301 | ||
c072481d PB |
11302 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
11303 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
11304 | { |
11305 | struct io_uring_restriction *res; | |
11306 | size_t size; | |
11307 | int i, ret; | |
11308 | ||
7e84e1c7 SG |
11309 | /* Restrictions allowed only if rings started disabled */ |
11310 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
11311 | return -EBADFD; | |
11312 | ||
21b55dbc | 11313 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 11314 | if (ctx->restrictions.registered) |
21b55dbc SG |
11315 | return -EBUSY; |
11316 | ||
11317 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
11318 | return -EINVAL; | |
11319 | ||
11320 | size = array_size(nr_args, sizeof(*res)); | |
11321 | if (size == SIZE_MAX) | |
11322 | return -EOVERFLOW; | |
11323 | ||
11324 | res = memdup_user(arg, size); | |
11325 | if (IS_ERR(res)) | |
11326 | return PTR_ERR(res); | |
11327 | ||
11328 | ret = 0; | |
11329 | ||
11330 | for (i = 0; i < nr_args; i++) { | |
11331 | switch (res[i].opcode) { | |
11332 | case IORING_RESTRICTION_REGISTER_OP: | |
11333 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
11334 | ret = -EINVAL; | |
11335 | goto out; | |
11336 | } | |
11337 | ||
11338 | __set_bit(res[i].register_op, | |
11339 | ctx->restrictions.register_op); | |
11340 | break; | |
11341 | case IORING_RESTRICTION_SQE_OP: | |
11342 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
11343 | ret = -EINVAL; | |
11344 | goto out; | |
11345 | } | |
11346 | ||
11347 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
11348 | break; | |
11349 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
11350 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
11351 | break; | |
11352 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
11353 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
11354 | break; | |
11355 | default: | |
11356 | ret = -EINVAL; | |
11357 | goto out; | |
11358 | } | |
11359 | } | |
11360 | ||
11361 | out: | |
11362 | /* Reset all restrictions if an error happened */ | |
11363 | if (ret != 0) | |
11364 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
11365 | else | |
7e84e1c7 | 11366 | ctx->restrictions.registered = true; |
21b55dbc SG |
11367 | |
11368 | kfree(res); | |
11369 | return ret; | |
11370 | } | |
11371 | ||
7e84e1c7 SG |
11372 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
11373 | { | |
11374 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
11375 | return -EBADFD; | |
11376 | ||
11377 | if (ctx->restrictions.registered) | |
11378 | ctx->restricted = 1; | |
11379 | ||
0298ef96 PB |
11380 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
11381 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
11382 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
11383 | return 0; |
11384 | } | |
11385 | ||
fdecb662 | 11386 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 11387 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
11388 | unsigned nr_args) |
11389 | { | |
11390 | __u32 tmp; | |
11391 | int err; | |
11392 | ||
c3bdad02 PB |
11393 | if (up->resv) |
11394 | return -EINVAL; | |
98f0b3b4 PB |
11395 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
11396 | return -EOVERFLOW; | |
11397 | err = io_rsrc_node_switch_start(ctx); | |
11398 | if (err) | |
11399 | return err; | |
11400 | ||
fdecb662 PB |
11401 | switch (type) { |
11402 | case IORING_RSRC_FILE: | |
98f0b3b4 | 11403 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
11404 | case IORING_RSRC_BUFFER: |
11405 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
11406 | } |
11407 | return -EINVAL; | |
11408 | } | |
11409 | ||
c3bdad02 PB |
11410 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
11411 | unsigned nr_args) | |
98f0b3b4 | 11412 | { |
c3bdad02 | 11413 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
11414 | |
11415 | if (!nr_args) | |
11416 | return -EINVAL; | |
c3bdad02 PB |
11417 | memset(&up, 0, sizeof(up)); |
11418 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
11419 | return -EFAULT; | |
11420 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
11421 | } | |
11422 | ||
11423 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 11424 | unsigned size, unsigned type) |
c3bdad02 PB |
11425 | { |
11426 | struct io_uring_rsrc_update2 up; | |
11427 | ||
11428 | if (size != sizeof(up)) | |
11429 | return -EINVAL; | |
98f0b3b4 PB |
11430 | if (copy_from_user(&up, arg, sizeof(up))) |
11431 | return -EFAULT; | |
992da01a | 11432 | if (!up.nr || up.resv) |
98f0b3b4 | 11433 | return -EINVAL; |
992da01a | 11434 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
11435 | } |
11436 | ||
c072481d | 11437 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 11438 | unsigned int size, unsigned int type) |
792e3582 PB |
11439 | { |
11440 | struct io_uring_rsrc_register rr; | |
11441 | ||
11442 | /* keep it extendible */ | |
11443 | if (size != sizeof(rr)) | |
11444 | return -EINVAL; | |
11445 | ||
11446 | memset(&rr, 0, sizeof(rr)); | |
11447 | if (copy_from_user(&rr, arg, size)) | |
11448 | return -EFAULT; | |
992da01a | 11449 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
11450 | return -EINVAL; |
11451 | ||
992da01a | 11452 | switch (type) { |
792e3582 PB |
11453 | case IORING_RSRC_FILE: |
11454 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
11455 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
11456 | case IORING_RSRC_BUFFER: |
11457 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
11458 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
11459 | } |
11460 | return -EINVAL; | |
11461 | } | |
11462 | ||
c072481d PB |
11463 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
11464 | void __user *arg, unsigned len) | |
fe76421d JA |
11465 | { |
11466 | struct io_uring_task *tctx = current->io_uring; | |
11467 | cpumask_var_t new_mask; | |
11468 | int ret; | |
11469 | ||
11470 | if (!tctx || !tctx->io_wq) | |
11471 | return -EINVAL; | |
11472 | ||
11473 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
11474 | return -ENOMEM; | |
11475 | ||
11476 | cpumask_clear(new_mask); | |
11477 | if (len > cpumask_size()) | |
11478 | len = cpumask_size(); | |
11479 | ||
0f5e4b83 ES |
11480 | if (in_compat_syscall()) { |
11481 | ret = compat_get_bitmap(cpumask_bits(new_mask), | |
11482 | (const compat_ulong_t __user *)arg, | |
11483 | len * 8 /* CHAR_BIT */); | |
11484 | } else { | |
11485 | ret = copy_from_user(new_mask, arg, len); | |
11486 | } | |
11487 | ||
11488 | if (ret) { | |
fe76421d JA |
11489 | free_cpumask_var(new_mask); |
11490 | return -EFAULT; | |
11491 | } | |
11492 | ||
11493 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
11494 | free_cpumask_var(new_mask); | |
11495 | return ret; | |
11496 | } | |
11497 | ||
c072481d | 11498 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
11499 | { |
11500 | struct io_uring_task *tctx = current->io_uring; | |
11501 | ||
11502 | if (!tctx || !tctx->io_wq) | |
11503 | return -EINVAL; | |
11504 | ||
11505 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
11506 | } | |
11507 | ||
c072481d PB |
11508 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
11509 | void __user *arg) | |
b22fa62a | 11510 | __must_hold(&ctx->uring_lock) |
2e480058 | 11511 | { |
b22fa62a | 11512 | struct io_tctx_node *node; |
fa84693b JA |
11513 | struct io_uring_task *tctx = NULL; |
11514 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
11515 | __u32 new_count[2]; |
11516 | int i, ret; | |
11517 | ||
2e480058 JA |
11518 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
11519 | return -EFAULT; | |
11520 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
11521 | if (new_count[i] > INT_MAX) | |
11522 | return -EINVAL; | |
11523 | ||
fa84693b JA |
11524 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
11525 | sqd = ctx->sq_data; | |
11526 | if (sqd) { | |
009ad9f0 JA |
11527 | /* |
11528 | * Observe the correct sqd->lock -> ctx->uring_lock | |
11529 | * ordering. Fine to drop uring_lock here, we hold | |
11530 | * a ref to the ctx. | |
11531 | */ | |
41d3a6bd | 11532 | refcount_inc(&sqd->refs); |
009ad9f0 | 11533 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 11534 | mutex_lock(&sqd->lock); |
009ad9f0 | 11535 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
11536 | if (sqd->thread) |
11537 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
11538 | } |
11539 | } else { | |
11540 | tctx = current->io_uring; | |
11541 | } | |
11542 | ||
e139a1ec | 11543 | BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); |
fa84693b | 11544 | |
bad119b9 PB |
11545 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
11546 | if (new_count[i]) | |
11547 | ctx->iowq_limits[i] = new_count[i]; | |
e139a1ec PB |
11548 | ctx->iowq_limits_set = true; |
11549 | ||
e139a1ec PB |
11550 | if (tctx && tctx->io_wq) { |
11551 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
11552 | if (ret) | |
11553 | goto err; | |
11554 | } else { | |
11555 | memset(new_count, 0, sizeof(new_count)); | |
11556 | } | |
fa84693b | 11557 | |
41d3a6bd | 11558 | if (sqd) { |
fa84693b | 11559 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
11560 | io_put_sq_data(sqd); |
11561 | } | |
2e480058 JA |
11562 | |
11563 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
11564 | return -EFAULT; | |
11565 | ||
b22fa62a PB |
11566 | /* that's it for SQPOLL, only the SQPOLL task creates requests */ |
11567 | if (sqd) | |
11568 | return 0; | |
11569 | ||
11570 | /* now propagate the restriction to all registered users */ | |
11571 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
11572 | struct io_uring_task *tctx = node->task->io_uring; | |
11573 | ||
11574 | if (WARN_ON_ONCE(!tctx->io_wq)) | |
11575 | continue; | |
11576 | ||
11577 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
11578 | new_count[i] = ctx->iowq_limits[i]; | |
11579 | /* ignore errors, it always returns zero anyway */ | |
11580 | (void)io_wq_max_workers(tctx->io_wq, new_count); | |
11581 | } | |
2e480058 | 11582 | return 0; |
fa84693b | 11583 | err: |
41d3a6bd | 11584 | if (sqd) { |
fa84693b | 11585 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
11586 | io_put_sq_data(sqd); |
11587 | } | |
fa84693b | 11588 | return ret; |
2e480058 JA |
11589 | } |
11590 | ||
edafccee JA |
11591 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
11592 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
11593 | __releases(ctx->uring_lock) |
11594 | __acquires(ctx->uring_lock) | |
edafccee JA |
11595 | { |
11596 | int ret; | |
11597 | ||
35fa71a0 JA |
11598 | /* |
11599 | * We're inside the ring mutex, if the ref is already dying, then | |
11600 | * someone else killed the ctx or is already going through | |
11601 | * io_uring_register(). | |
11602 | */ | |
11603 | if (percpu_ref_is_dying(&ctx->refs)) | |
11604 | return -ENXIO; | |
11605 | ||
75c4021a PB |
11606 | if (ctx->restricted) { |
11607 | if (opcode >= IORING_REGISTER_LAST) | |
11608 | return -EINVAL; | |
11609 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
11610 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
11611 | return -EACCES; | |
11612 | } | |
11613 | ||
edafccee JA |
11614 | switch (opcode) { |
11615 | case IORING_REGISTER_BUFFERS: | |
634d00df | 11616 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
11617 | break; |
11618 | case IORING_UNREGISTER_BUFFERS: | |
11619 | ret = -EINVAL; | |
11620 | if (arg || nr_args) | |
11621 | break; | |
0a96bbe4 | 11622 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 11623 | break; |
6b06314c | 11624 | case IORING_REGISTER_FILES: |
792e3582 | 11625 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
11626 | break; |
11627 | case IORING_UNREGISTER_FILES: | |
11628 | ret = -EINVAL; | |
11629 | if (arg || nr_args) | |
11630 | break; | |
11631 | ret = io_sqe_files_unregister(ctx); | |
11632 | break; | |
c3a31e60 | 11633 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 11634 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 11635 | break; |
9b402849 JA |
11636 | case IORING_REGISTER_EVENTFD: |
11637 | ret = -EINVAL; | |
11638 | if (nr_args != 1) | |
11639 | break; | |
c75312dd UA |
11640 | ret = io_eventfd_register(ctx, arg, 0); |
11641 | break; | |
11642 | case IORING_REGISTER_EVENTFD_ASYNC: | |
11643 | ret = -EINVAL; | |
11644 | if (nr_args != 1) | |
f2842ab5 | 11645 | break; |
c75312dd | 11646 | ret = io_eventfd_register(ctx, arg, 1); |
9b402849 JA |
11647 | break; |
11648 | case IORING_UNREGISTER_EVENTFD: | |
11649 | ret = -EINVAL; | |
11650 | if (arg || nr_args) | |
11651 | break; | |
11652 | ret = io_eventfd_unregister(ctx); | |
11653 | break; | |
66f4af93 JA |
11654 | case IORING_REGISTER_PROBE: |
11655 | ret = -EINVAL; | |
11656 | if (!arg || nr_args > 256) | |
11657 | break; | |
11658 | ret = io_probe(ctx, arg, nr_args); | |
11659 | break; | |
071698e1 JA |
11660 | case IORING_REGISTER_PERSONALITY: |
11661 | ret = -EINVAL; | |
11662 | if (arg || nr_args) | |
11663 | break; | |
11664 | ret = io_register_personality(ctx); | |
11665 | break; | |
11666 | case IORING_UNREGISTER_PERSONALITY: | |
11667 | ret = -EINVAL; | |
11668 | if (arg) | |
11669 | break; | |
11670 | ret = io_unregister_personality(ctx, nr_args); | |
11671 | break; | |
7e84e1c7 SG |
11672 | case IORING_REGISTER_ENABLE_RINGS: |
11673 | ret = -EINVAL; | |
11674 | if (arg || nr_args) | |
11675 | break; | |
11676 | ret = io_register_enable_rings(ctx); | |
11677 | break; | |
21b55dbc SG |
11678 | case IORING_REGISTER_RESTRICTIONS: |
11679 | ret = io_register_restrictions(ctx, arg, nr_args); | |
11680 | break; | |
992da01a PB |
11681 | case IORING_REGISTER_FILES2: |
11682 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
11683 | break; | |
11684 | case IORING_REGISTER_FILES_UPDATE2: | |
11685 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11686 | IORING_RSRC_FILE); | |
11687 | break; | |
11688 | case IORING_REGISTER_BUFFERS2: | |
11689 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 11690 | break; |
992da01a PB |
11691 | case IORING_REGISTER_BUFFERS_UPDATE: |
11692 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11693 | IORING_RSRC_BUFFER); | |
c3bdad02 | 11694 | break; |
fe76421d JA |
11695 | case IORING_REGISTER_IOWQ_AFF: |
11696 | ret = -EINVAL; | |
11697 | if (!arg || !nr_args) | |
11698 | break; | |
11699 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
11700 | break; | |
11701 | case IORING_UNREGISTER_IOWQ_AFF: | |
11702 | ret = -EINVAL; | |
11703 | if (arg || nr_args) | |
11704 | break; | |
11705 | ret = io_unregister_iowq_aff(ctx); | |
11706 | break; | |
2e480058 JA |
11707 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
11708 | ret = -EINVAL; | |
11709 | if (!arg || nr_args != 2) | |
11710 | break; | |
11711 | ret = io_register_iowq_max_workers(ctx, arg); | |
11712 | break; | |
e7a6c00d JA |
11713 | case IORING_REGISTER_RING_FDS: |
11714 | ret = io_ringfd_register(ctx, arg, nr_args); | |
11715 | break; | |
11716 | case IORING_UNREGISTER_RING_FDS: | |
11717 | ret = io_ringfd_unregister(ctx, arg, nr_args); | |
11718 | break; | |
edafccee JA |
11719 | default: |
11720 | ret = -EINVAL; | |
11721 | break; | |
11722 | } | |
11723 | ||
edafccee JA |
11724 | return ret; |
11725 | } | |
11726 | ||
11727 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
11728 | void __user *, arg, unsigned int, nr_args) | |
11729 | { | |
11730 | struct io_ring_ctx *ctx; | |
11731 | long ret = -EBADF; | |
11732 | struct fd f; | |
11733 | ||
11734 | f = fdget(fd); | |
11735 | if (!f.file) | |
11736 | return -EBADF; | |
11737 | ||
11738 | ret = -EOPNOTSUPP; | |
11739 | if (f.file->f_op != &io_uring_fops) | |
11740 | goto out_fput; | |
11741 | ||
11742 | ctx = f.file->private_data; | |
11743 | ||
b6c23dd5 PB |
11744 | io_run_task_work(); |
11745 | ||
edafccee JA |
11746 | mutex_lock(&ctx->uring_lock); |
11747 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
11748 | mutex_unlock(&ctx->uring_lock); | |
2757be22 | 11749 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, ret); |
edafccee JA |
11750 | out_fput: |
11751 | fdput(f); | |
11752 | return ret; | |
11753 | } | |
11754 | ||
2b188cc1 JA |
11755 | static int __init io_uring_init(void) |
11756 | { | |
d7f62e82 SM |
11757 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
11758 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
11759 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
11760 | } while (0) | |
11761 | ||
11762 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
11763 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
11764 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
11765 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
11766 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
11767 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
11768 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
11769 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
11770 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
11771 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 11772 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
11773 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
11774 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
11775 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
11776 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
11777 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
11778 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
11779 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
11780 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
11781 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
11782 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
11783 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
11784 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
11785 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
11786 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
11787 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 11788 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
11789 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
11790 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 11791 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 11792 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 11793 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 11794 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 11795 | |
b0d658ec PB |
11796 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
11797 | sizeof(struct io_uring_rsrc_update)); | |
11798 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
11799 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
11800 | |
11801 | /* ->buf_index is u16 */ | |
11802 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
11803 | ||
b0d658ec PB |
11804 | /* should fit into one byte */ |
11805 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
11806 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
11807 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 11808 | |
d3656344 | 11809 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 11810 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 11811 | |
91f245d5 JA |
11812 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
11813 | SLAB_ACCOUNT); | |
2b188cc1 JA |
11814 | return 0; |
11815 | }; | |
11816 | __initcall(io_uring_init); |