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329061d3 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/kernel.h> | |
3 | #include <linux/errno.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/file.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/slab.h> | |
8 | #include <linux/poll.h> | |
9 | #include <linux/hashtable.h> | |
10 | #include <linux/io_uring.h> | |
11 | ||
12 | #include <trace/events/io_uring.h> | |
13 | ||
14 | #include <uapi/linux/io_uring.h> | |
15 | ||
329061d3 JA |
16 | #include "io_uring.h" |
17 | #include "refs.h" | |
18 | #include "opdef.h" | |
3b77495a | 19 | #include "kbuf.h" |
329061d3 | 20 | #include "poll.h" |
38513c46 | 21 | #include "cancel.h" |
329061d3 JA |
22 | |
23 | struct io_poll_update { | |
24 | struct file *file; | |
25 | u64 old_user_data; | |
26 | u64 new_user_data; | |
27 | __poll_t events; | |
28 | bool update_events; | |
29 | bool update_user_data; | |
30 | }; | |
31 | ||
32 | struct io_poll_table { | |
33 | struct poll_table_struct pt; | |
34 | struct io_kiocb *req; | |
35 | int nr_entries; | |
36 | int error; | |
49f1c68e | 37 | bool owning; |
063a0079 PB |
38 | /* output value, set only if arm poll returns >0 */ |
39 | __poll_t result_mask; | |
329061d3 JA |
40 | }; |
41 | ||
42 | #define IO_POLL_CANCEL_FLAG BIT(31) | |
a26a35e9 PB |
43 | #define IO_POLL_RETRY_FLAG BIT(30) |
44 | #define IO_POLL_REF_MASK GENMASK(29, 0) | |
45 | ||
46 | /* | |
47 | * We usually have 1-2 refs taken, 128 is more than enough and we want to | |
48 | * maximise the margin between this amount and the moment when it overflows. | |
49 | */ | |
50 | #define IO_POLL_REF_BIAS 128 | |
329061d3 | 51 | |
0638cd7b PB |
52 | #define IO_WQE_F_DOUBLE 1 |
53 | ||
54 | static inline struct io_kiocb *wqe_to_req(struct wait_queue_entry *wqe) | |
55 | { | |
56 | unsigned long priv = (unsigned long)wqe->private; | |
57 | ||
58 | return (struct io_kiocb *)(priv & ~IO_WQE_F_DOUBLE); | |
59 | } | |
60 | ||
61 | static inline bool wqe_is_double(struct wait_queue_entry *wqe) | |
62 | { | |
63 | unsigned long priv = (unsigned long)wqe->private; | |
64 | ||
65 | return priv & IO_WQE_F_DOUBLE; | |
66 | } | |
67 | ||
a26a35e9 PB |
68 | static bool io_poll_get_ownership_slowpath(struct io_kiocb *req) |
69 | { | |
70 | int v; | |
71 | ||
72 | /* | |
73 | * poll_refs are already elevated and we don't have much hope for | |
74 | * grabbing the ownership. Instead of incrementing set a retry flag | |
75 | * to notify the loop that there might have been some change. | |
76 | */ | |
77 | v = atomic_fetch_or(IO_POLL_RETRY_FLAG, &req->poll_refs); | |
78 | if (v & IO_POLL_REF_MASK) | |
79 | return false; | |
80 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); | |
81 | } | |
82 | ||
329061d3 JA |
83 | /* |
84 | * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can | |
85 | * bump it and acquire ownership. It's disallowed to modify requests while not | |
86 | * owning it, that prevents from races for enqueueing task_work's and b/w | |
87 | * arming poll and wakeups. | |
88 | */ | |
89 | static inline bool io_poll_get_ownership(struct io_kiocb *req) | |
90 | { | |
a26a35e9 PB |
91 | if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) |
92 | return io_poll_get_ownership_slowpath(req); | |
329061d3 JA |
93 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); |
94 | } | |
95 | ||
96 | static void io_poll_mark_cancelled(struct io_kiocb *req) | |
97 | { | |
98 | atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); | |
99 | } | |
100 | ||
101 | static struct io_poll *io_poll_get_double(struct io_kiocb *req) | |
102 | { | |
103 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ | |
104 | if (req->opcode == IORING_OP_POLL_ADD) | |
105 | return req->async_data; | |
106 | return req->apoll->double_poll; | |
107 | } | |
108 | ||
109 | static struct io_poll *io_poll_get_single(struct io_kiocb *req) | |
110 | { | |
111 | if (req->opcode == IORING_OP_POLL_ADD) | |
f2ccb5ae | 112 | return io_kiocb_to_cmd(req, struct io_poll); |
329061d3 JA |
113 | return &req->apoll->poll; |
114 | } | |
115 | ||
116 | static void io_poll_req_insert(struct io_kiocb *req) | |
117 | { | |
e6f89be6 PB |
118 | struct io_hash_table *table = &req->ctx->cancel_table; |
119 | u32 index = hash_long(req->cqe.user_data, table->hash_bits); | |
120 | struct io_hash_bucket *hb = &table->hbs[index]; | |
329061d3 | 121 | |
38513c46 HX |
122 | spin_lock(&hb->lock); |
123 | hlist_add_head(&req->hash_node, &hb->list); | |
124 | spin_unlock(&hb->lock); | |
125 | } | |
126 | ||
127 | static void io_poll_req_delete(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
128 | { | |
e6f89be6 PB |
129 | struct io_hash_table *table = &req->ctx->cancel_table; |
130 | u32 index = hash_long(req->cqe.user_data, table->hash_bits); | |
131 | spinlock_t *lock = &table->hbs[index].lock; | |
38513c46 HX |
132 | |
133 | spin_lock(lock); | |
134 | hash_del(&req->hash_node); | |
135 | spin_unlock(lock); | |
329061d3 JA |
136 | } |
137 | ||
9ca9fb24 PB |
138 | static void io_poll_req_insert_locked(struct io_kiocb *req) |
139 | { | |
140 | struct io_hash_table *table = &req->ctx->cancel_table_locked; | |
141 | u32 index = hash_long(req->cqe.user_data, table->hash_bits); | |
142 | ||
5576035f PB |
143 | lockdep_assert_held(&req->ctx->uring_lock); |
144 | ||
9ca9fb24 PB |
145 | hlist_add_head(&req->hash_node, &table->hbs[index].list); |
146 | } | |
147 | ||
148 | static void io_poll_tw_hash_eject(struct io_kiocb *req, bool *locked) | |
149 | { | |
150 | struct io_ring_ctx *ctx = req->ctx; | |
151 | ||
152 | if (req->flags & REQ_F_HASH_LOCKED) { | |
153 | /* | |
154 | * ->cancel_table_locked is protected by ->uring_lock in | |
155 | * contrast to per bucket spinlocks. Likely, tctx_task_work() | |
156 | * already grabbed the mutex for us, but there is a chance it | |
157 | * failed. | |
158 | */ | |
159 | io_tw_lock(ctx, locked); | |
160 | hash_del(&req->hash_node); | |
b21a51e2 | 161 | req->flags &= ~REQ_F_HASH_LOCKED; |
9ca9fb24 PB |
162 | } else { |
163 | io_poll_req_delete(req, ctx); | |
164 | } | |
165 | } | |
166 | ||
329061d3 JA |
167 | static void io_init_poll_iocb(struct io_poll *poll, __poll_t events, |
168 | wait_queue_func_t wake_func) | |
169 | { | |
170 | poll->head = NULL; | |
171 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) | |
172 | /* mask in events that we always want/need */ | |
173 | poll->events = events | IO_POLL_UNMASK; | |
174 | INIT_LIST_HEAD(&poll->wait.entry); | |
175 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
176 | } | |
177 | ||
178 | static inline void io_poll_remove_entry(struct io_poll *poll) | |
179 | { | |
180 | struct wait_queue_head *head = smp_load_acquire(&poll->head); | |
181 | ||
182 | if (head) { | |
183 | spin_lock_irq(&head->lock); | |
184 | list_del_init(&poll->wait.entry); | |
185 | poll->head = NULL; | |
186 | spin_unlock_irq(&head->lock); | |
187 | } | |
188 | } | |
189 | ||
190 | static void io_poll_remove_entries(struct io_kiocb *req) | |
191 | { | |
192 | /* | |
193 | * Nothing to do if neither of those flags are set. Avoid dipping | |
194 | * into the poll/apoll/double cachelines if we can. | |
195 | */ | |
196 | if (!(req->flags & (REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL))) | |
197 | return; | |
198 | ||
199 | /* | |
200 | * While we hold the waitqueue lock and the waitqueue is nonempty, | |
201 | * wake_up_pollfree() will wait for us. However, taking the waitqueue | |
202 | * lock in the first place can race with the waitqueue being freed. | |
203 | * | |
204 | * We solve this as eventpoll does: by taking advantage of the fact that | |
205 | * all users of wake_up_pollfree() will RCU-delay the actual free. If | |
206 | * we enter rcu_read_lock() and see that the pointer to the queue is | |
207 | * non-NULL, we can then lock it without the memory being freed out from | |
208 | * under us. | |
209 | * | |
210 | * Keep holding rcu_read_lock() as long as we hold the queue lock, in | |
211 | * case the caller deletes the entry from the queue, leaving it empty. | |
212 | * In that case, only RCU prevents the queue memory from being freed. | |
213 | */ | |
214 | rcu_read_lock(); | |
215 | if (req->flags & REQ_F_SINGLE_POLL) | |
216 | io_poll_remove_entry(io_poll_get_single(req)); | |
217 | if (req->flags & REQ_F_DOUBLE_POLL) | |
218 | io_poll_remove_entry(io_poll_get_double(req)); | |
219 | rcu_read_unlock(); | |
220 | } | |
221 | ||
2ba69707 DY |
222 | enum { |
223 | IOU_POLL_DONE = 0, | |
224 | IOU_POLL_NO_ACTION = 1, | |
114eccdf | 225 | IOU_POLL_REMOVE_POLL_USE_RES = 2, |
2ba69707 DY |
226 | }; |
227 | ||
329061d3 JA |
228 | /* |
229 | * All poll tw should go through this. Checks for poll events, manages | |
230 | * references, does rewait, etc. | |
231 | * | |
2ba69707 DY |
232 | * Returns a negative error on failure. IOU_POLL_NO_ACTION when no action require, |
233 | * which is either spurious wakeup or multishot CQE is served. | |
234 | * IOU_POLL_DONE when it's done with the request, then the mask is stored in req->cqe.res. | |
114eccdf DY |
235 | * IOU_POLL_REMOVE_POLL_USE_RES indicates to remove multishot poll and that the result |
236 | * is stored in req->cqe. | |
329061d3 JA |
237 | */ |
238 | static int io_poll_check_events(struct io_kiocb *req, bool *locked) | |
239 | { | |
329061d3 JA |
240 | int v, ret; |
241 | ||
242 | /* req->task == current here, checking PF_EXITING is safe */ | |
243 | if (unlikely(req->task->flags & PF_EXITING)) | |
244 | return -ECANCELED; | |
245 | ||
246 | do { | |
247 | v = atomic_read(&req->poll_refs); | |
248 | ||
9805fa2d PB |
249 | if (unlikely(v != 1)) { |
250 | /* tw should be the owner and so have some refs */ | |
251 | if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) | |
c3bfb57e | 252 | return IOU_POLL_NO_ACTION; |
9805fa2d PB |
253 | if (v & IO_POLL_CANCEL_FLAG) |
254 | return -ECANCELED; | |
a26a35e9 | 255 | /* |
9805fa2d PB |
256 | * cqe.res contains only events of the first wake up |
257 | * and all others are to be lost. Redo vfs_poll() to get | |
258 | * up to date state. | |
a26a35e9 | 259 | */ |
9805fa2d PB |
260 | if ((v & IO_POLL_REF_MASK) != 1) |
261 | req->cqe.res = 0; | |
262 | ||
263 | if (v & IO_POLL_RETRY_FLAG) { | |
264 | req->cqe.res = 0; | |
265 | /* | |
266 | * We won't find new events that came in between | |
267 | * vfs_poll and the ref put unless we clear the | |
268 | * flag in advance. | |
269 | */ | |
270 | atomic_andnot(IO_POLL_RETRY_FLAG, &req->poll_refs); | |
271 | v &= ~IO_POLL_RETRY_FLAG; | |
272 | } | |
a26a35e9 | 273 | } |
329061d3 | 274 | |
2ba69707 | 275 | /* the mask was stashed in __io_poll_execute */ |
329061d3 JA |
276 | if (!req->cqe.res) { |
277 | struct poll_table_struct pt = { ._key = req->apoll_events }; | |
278 | req->cqe.res = vfs_poll(req->file, &pt) & req->apoll_events; | |
279 | } | |
280 | ||
281 | if ((unlikely(!req->cqe.res))) | |
282 | continue; | |
283 | if (req->apoll_events & EPOLLONESHOT) | |
2ba69707 | 284 | return IOU_POLL_DONE; |
329061d3 JA |
285 | |
286 | /* multishot, just fill a CQE and proceed */ | |
287 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
288 | __poll_t mask = mangle_poll(req->cqe.res & | |
289 | req->apoll_events); | |
329061d3 | 290 | |
047b6aef | 291 | if (!io_aux_cqe(req->ctx, *locked, req->cqe.user_data, |
9b8c5475 | 292 | mask, IORING_CQE_F_MORE, false)) { |
a2da6763 DY |
293 | io_req_set_res(req, mask, 0); |
294 | return IOU_POLL_REMOVE_POLL_USE_RES; | |
295 | } | |
d245bca6 PB |
296 | } else { |
297 | ret = io_poll_issue(req, locked); | |
114eccdf DY |
298 | if (ret == IOU_STOP_MULTISHOT) |
299 | return IOU_POLL_REMOVE_POLL_USE_RES; | |
2ba69707 | 300 | if (ret < 0) |
d245bca6 PB |
301 | return ret; |
302 | } | |
329061d3 | 303 | |
b98186ae PB |
304 | /* force the next iteration to vfs_poll() */ |
305 | req->cqe.res = 0; | |
306 | ||
329061d3 JA |
307 | /* |
308 | * Release all references, retry if someone tried to restart | |
309 | * task_work while we were executing it. | |
310 | */ | |
12ad3d2d LM |
311 | } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs) & |
312 | IO_POLL_REF_MASK); | |
329061d3 | 313 | |
2ba69707 | 314 | return IOU_POLL_NO_ACTION; |
329061d3 JA |
315 | } |
316 | ||
317 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) | |
318 | { | |
329061d3 JA |
319 | int ret; |
320 | ||
321 | ret = io_poll_check_events(req, locked); | |
2ba69707 | 322 | if (ret == IOU_POLL_NO_ACTION) |
329061d3 | 323 | return; |
329061d3 | 324 | io_poll_remove_entries(req); |
9ca9fb24 PB |
325 | io_poll_tw_hash_eject(req, locked); |
326 | ||
443e5755 PB |
327 | if (req->opcode == IORING_OP_POLL_ADD) { |
328 | if (ret == IOU_POLL_DONE) { | |
329 | struct io_poll *poll; | |
329061d3 | 330 | |
443e5755 PB |
331 | poll = io_kiocb_to_cmd(req, struct io_poll); |
332 | req->cqe.res = mangle_poll(req->cqe.res & poll->events); | |
333 | } else if (ret != IOU_POLL_REMOVE_POLL_USE_RES) { | |
334 | req->cqe.res = ret; | |
335 | req_set_fail(req); | |
336 | } | |
329061d3 | 337 | |
443e5755 | 338 | io_req_set_res(req, req->cqe.res, 0); |
c06c6c5d | 339 | io_req_task_complete(req, locked); |
443e5755 PB |
340 | } else { |
341 | io_tw_lock(req->ctx, locked); | |
342 | ||
343 | if (ret == IOU_POLL_REMOVE_POLL_USE_RES) | |
344 | io_req_task_complete(req, locked); | |
345 | else if (ret == IOU_POLL_DONE) | |
346 | io_req_task_submit(req, locked); | |
347 | else | |
348 | io_req_defer_failed(req, ret); | |
349 | } | |
329061d3 JA |
350 | } |
351 | ||
13a99017 | 352 | static void __io_poll_execute(struct io_kiocb *req, int mask) |
329061d3 JA |
353 | { |
354 | io_req_set_res(req, mask, 0); | |
443e5755 | 355 | req->io_task_work.func = io_poll_task_func; |
329061d3 | 356 | |
48863ffd | 357 | trace_io_uring_task_add(req, mask); |
329061d3 JA |
358 | io_req_task_work_add(req); |
359 | } | |
360 | ||
13a99017 | 361 | static inline void io_poll_execute(struct io_kiocb *req, int res) |
329061d3 JA |
362 | { |
363 | if (io_poll_get_ownership(req)) | |
13a99017 | 364 | __io_poll_execute(req, res); |
329061d3 JA |
365 | } |
366 | ||
367 | static void io_poll_cancel_req(struct io_kiocb *req) | |
368 | { | |
369 | io_poll_mark_cancelled(req); | |
370 | /* kick tw, which should complete the request */ | |
13a99017 | 371 | io_poll_execute(req, 0); |
329061d3 JA |
372 | } |
373 | ||
329061d3 JA |
374 | #define IO_ASYNC_POLL_COMMON (EPOLLONESHOT | EPOLLPRI) |
375 | ||
fe991a76 JA |
376 | static __cold int io_pollfree_wake(struct io_kiocb *req, struct io_poll *poll) |
377 | { | |
378 | io_poll_mark_cancelled(req); | |
379 | /* we have to kick tw in case it's not already */ | |
380 | io_poll_execute(req, 0); | |
381 | ||
382 | /* | |
383 | * If the waitqueue is being freed early but someone is already | |
384 | * holds ownership over it, we have to tear down the request as | |
385 | * best we can. That means immediately removing the request from | |
386 | * its waitqueue and preventing all further accesses to the | |
387 | * waitqueue via the request. | |
388 | */ | |
389 | list_del_init(&poll->wait.entry); | |
390 | ||
391 | /* | |
392 | * Careful: this *must* be the last step, since as soon | |
393 | * as req->head is NULL'ed out, the request can be | |
394 | * completed and freed, since aio_poll_complete_work() | |
395 | * will no longer need to take the waitqueue lock. | |
396 | */ | |
397 | smp_store_release(&poll->head, NULL); | |
398 | return 1; | |
399 | } | |
400 | ||
329061d3 JA |
401 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
402 | void *key) | |
403 | { | |
404 | struct io_kiocb *req = wqe_to_req(wait); | |
405 | struct io_poll *poll = container_of(wait, struct io_poll, wait); | |
406 | __poll_t mask = key_to_poll(key); | |
407 | ||
fe991a76 JA |
408 | if (unlikely(mask & POLLFREE)) |
409 | return io_pollfree_wake(req, poll); | |
329061d3 JA |
410 | |
411 | /* for instances that support it check for an event match first */ | |
412 | if (mask && !(mask & (poll->events & ~IO_ASYNC_POLL_COMMON))) | |
413 | return 0; | |
414 | ||
415 | if (io_poll_get_ownership(req)) { | |
44648532 JA |
416 | /* |
417 | * If we trigger a multishot poll off our own wakeup path, | |
418 | * disable multishot as there is a circular dependency between | |
419 | * CQ posting and triggering the event. | |
420 | */ | |
421 | if (mask & EPOLL_URING_WAKE) | |
422 | poll->events |= EPOLLONESHOT; | |
423 | ||
329061d3 JA |
424 | /* optional, saves extra locking for removal in tw handler */ |
425 | if (mask && poll->events & EPOLLONESHOT) { | |
426 | list_del_init(&poll->wait.entry); | |
427 | poll->head = NULL; | |
428 | if (wqe_is_double(wait)) | |
429 | req->flags &= ~REQ_F_DOUBLE_POLL; | |
430 | else | |
431 | req->flags &= ~REQ_F_SINGLE_POLL; | |
432 | } | |
13a99017 | 433 | __io_poll_execute(req, mask); |
329061d3 JA |
434 | } |
435 | return 1; | |
436 | } | |
437 | ||
30a33669 PB |
438 | /* fails only when polling is already completing by the first entry */ |
439 | static bool io_poll_double_prepare(struct io_kiocb *req) | |
49f1c68e PB |
440 | { |
441 | struct wait_queue_head *head; | |
442 | struct io_poll *poll = io_poll_get_single(req); | |
443 | ||
444 | /* head is RCU protected, see io_poll_remove_entries() comments */ | |
445 | rcu_read_lock(); | |
446 | head = smp_load_acquire(&poll->head); | |
7a121ced | 447 | /* |
30a33669 PB |
448 | * poll arm might not hold ownership and so race for req->flags with |
449 | * io_poll_wake(). There is only one poll entry queued, serialise with | |
450 | * it by taking its head lock. As we're still arming the tw hanlder | |
451 | * is not going to be run, so there are no races with it. | |
7a121ced | 452 | */ |
30a33669 | 453 | if (head) { |
49f1c68e | 454 | spin_lock_irq(&head->lock); |
30a33669 PB |
455 | req->flags |= REQ_F_DOUBLE_POLL; |
456 | if (req->opcode == IORING_OP_POLL_ADD) | |
457 | req->flags |= REQ_F_ASYNC_DATA; | |
49f1c68e | 458 | spin_unlock_irq(&head->lock); |
30a33669 | 459 | } |
49f1c68e | 460 | rcu_read_unlock(); |
30a33669 | 461 | return !!head; |
49f1c68e PB |
462 | } |
463 | ||
329061d3 JA |
464 | static void __io_queue_proc(struct io_poll *poll, struct io_poll_table *pt, |
465 | struct wait_queue_head *head, | |
466 | struct io_poll **poll_ptr) | |
467 | { | |
468 | struct io_kiocb *req = pt->req; | |
469 | unsigned long wqe_private = (unsigned long) req; | |
470 | ||
471 | /* | |
472 | * The file being polled uses multiple waitqueues for poll handling | |
473 | * (e.g. one for read, one for write). Setup a separate io_poll | |
474 | * if this happens. | |
475 | */ | |
476 | if (unlikely(pt->nr_entries)) { | |
477 | struct io_poll *first = poll; | |
478 | ||
479 | /* double add on the same waitqueue head, ignore */ | |
480 | if (first->head == head) | |
481 | return; | |
482 | /* already have a 2nd entry, fail a third attempt */ | |
483 | if (*poll_ptr) { | |
484 | if ((*poll_ptr)->head == head) | |
485 | return; | |
486 | pt->error = -EINVAL; | |
487 | return; | |
488 | } | |
489 | ||
490 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
491 | if (!poll) { | |
492 | pt->error = -ENOMEM; | |
493 | return; | |
494 | } | |
49f1c68e | 495 | |
329061d3 | 496 | /* mark as double wq entry */ |
0638cd7b | 497 | wqe_private |= IO_WQE_F_DOUBLE; |
329061d3 | 498 | io_init_poll_iocb(poll, first->events, first->wait.func); |
30a33669 PB |
499 | if (!io_poll_double_prepare(req)) { |
500 | /* the request is completing, just back off */ | |
501 | kfree(poll); | |
502 | return; | |
503 | } | |
329061d3 | 504 | *poll_ptr = poll; |
49f1c68e PB |
505 | } else { |
506 | /* fine to modify, there is no poll queued to race with us */ | |
507 | req->flags |= REQ_F_SINGLE_POLL; | |
329061d3 JA |
508 | } |
509 | ||
329061d3 JA |
510 | pt->nr_entries++; |
511 | poll->head = head; | |
512 | poll->wait.private = (void *) wqe_private; | |
513 | ||
514 | if (poll->events & EPOLLEXCLUSIVE) | |
515 | add_wait_queue_exclusive(head, &poll->wait); | |
516 | else | |
517 | add_wait_queue(head, &poll->wait); | |
518 | } | |
519 | ||
520 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, | |
521 | struct poll_table_struct *p) | |
522 | { | |
523 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
f2ccb5ae | 524 | struct io_poll *poll = io_kiocb_to_cmd(pt->req, struct io_poll); |
329061d3 JA |
525 | |
526 | __io_queue_proc(poll, pt, head, | |
527 | (struct io_poll **) &pt->req->async_data); | |
528 | } | |
529 | ||
49f1c68e PB |
530 | static bool io_poll_can_finish_inline(struct io_kiocb *req, |
531 | struct io_poll_table *pt) | |
532 | { | |
533 | return pt->owning || io_poll_get_ownership(req); | |
534 | } | |
535 | ||
de08356f PB |
536 | /* |
537 | * Returns 0 when it's handed over for polling. The caller owns the requests if | |
538 | * it returns non-zero, but otherwise should not touch it. Negative values | |
539 | * contain an error code. When the result is >0, the polling has completed | |
540 | * inline and ipt.result_mask is set to the mask. | |
541 | */ | |
329061d3 JA |
542 | static int __io_arm_poll_handler(struct io_kiocb *req, |
543 | struct io_poll *poll, | |
49f1c68e PB |
544 | struct io_poll_table *ipt, __poll_t mask, |
545 | unsigned issue_flags) | |
329061d3 JA |
546 | { |
547 | struct io_ring_ctx *ctx = req->ctx; | |
329061d3 JA |
548 | |
549 | INIT_HLIST_NODE(&req->hash_node); | |
550 | req->work.cancel_seq = atomic_read(&ctx->cancel_seq); | |
551 | io_init_poll_iocb(poll, mask, io_poll_wake); | |
552 | poll->file = req->file; | |
329061d3 JA |
553 | req->apoll_events = poll->events; |
554 | ||
555 | ipt->pt._key = mask; | |
556 | ipt->req = req; | |
557 | ipt->error = 0; | |
558 | ipt->nr_entries = 0; | |
329061d3 | 559 | /* |
49f1c68e PB |
560 | * Polling is either completed here or via task_work, so if we're in the |
561 | * task context we're naturally serialised with tw by merit of running | |
562 | * the same task. When it's io-wq, take the ownership to prevent tw | |
563 | * from running. However, when we're in the task context, skip taking | |
564 | * it as an optimisation. | |
565 | * | |
566 | * Note: even though the request won't be completed/freed, without | |
567 | * ownership we still can race with io_poll_wake(). | |
568 | * io_poll_can_finish_inline() tries to deal with that. | |
329061d3 | 569 | */ |
49f1c68e | 570 | ipt->owning = issue_flags & IO_URING_F_UNLOCKED; |
49f1c68e | 571 | atomic_set(&req->poll_refs, (int)ipt->owning); |
e8375e43 PB |
572 | |
573 | /* io-wq doesn't hold uring_lock */ | |
574 | if (issue_flags & IO_URING_F_UNLOCKED) | |
575 | req->flags &= ~REQ_F_HASH_LOCKED; | |
576 | ||
329061d3 JA |
577 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
578 | ||
de08356f PB |
579 | if (unlikely(ipt->error || !ipt->nr_entries)) { |
580 | io_poll_remove_entries(req); | |
581 | ||
49f1c68e PB |
582 | if (!io_poll_can_finish_inline(req, ipt)) { |
583 | io_poll_mark_cancelled(req); | |
584 | return 0; | |
585 | } else if (mask && (poll->events & EPOLLET)) { | |
de08356f PB |
586 | ipt->result_mask = mask; |
587 | return 1; | |
de08356f | 588 | } |
49f1c68e | 589 | return ipt->error ?: -EINVAL; |
de08356f PB |
590 | } |
591 | ||
b9ba8a44 JA |
592 | if (mask && |
593 | ((poll->events & (EPOLLET|EPOLLONESHOT)) == (EPOLLET|EPOLLONESHOT))) { | |
49f1c68e PB |
594 | if (!io_poll_can_finish_inline(req, ipt)) |
595 | return 0; | |
329061d3 | 596 | io_poll_remove_entries(req); |
063a0079 | 597 | ipt->result_mask = mask; |
329061d3 | 598 | /* no one else has access to the req, forget about the ref */ |
063a0079 | 599 | return 1; |
329061d3 | 600 | } |
b9ba8a44 | 601 | |
9ca9fb24 PB |
602 | if (req->flags & REQ_F_HASH_LOCKED) |
603 | io_poll_req_insert_locked(req); | |
604 | else | |
605 | io_poll_req_insert(req); | |
329061d3 | 606 | |
49f1c68e PB |
607 | if (mask && (poll->events & EPOLLET) && |
608 | io_poll_can_finish_inline(req, ipt)) { | |
13a99017 | 609 | __io_poll_execute(req, mask); |
329061d3 JA |
610 | return 0; |
611 | } | |
612 | ||
49f1c68e PB |
613 | if (ipt->owning) { |
614 | /* | |
2f389343 PB |
615 | * Try to release ownership. If we see a change of state, e.g. |
616 | * poll was waken up, queue up a tw, it'll deal with it. | |
49f1c68e | 617 | */ |
2f389343 | 618 | if (atomic_cmpxchg(&req->poll_refs, 1, 0) != 1) |
49f1c68e PB |
619 | __io_poll_execute(req, 0); |
620 | } | |
329061d3 JA |
621 | return 0; |
622 | } | |
623 | ||
624 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
625 | struct poll_table_struct *p) | |
626 | { | |
627 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
628 | struct async_poll *apoll = pt->req->apoll; | |
629 | ||
630 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); | |
631 | } | |
632 | ||
5204aa8c PB |
633 | static struct async_poll *io_req_alloc_apoll(struct io_kiocb *req, |
634 | unsigned issue_flags) | |
635 | { | |
636 | struct io_ring_ctx *ctx = req->ctx; | |
9b797a37 | 637 | struct io_cache_entry *entry; |
5204aa8c PB |
638 | struct async_poll *apoll; |
639 | ||
640 | if (req->flags & REQ_F_POLLED) { | |
641 | apoll = req->apoll; | |
642 | kfree(apoll->double_poll); | |
df730ec2 XL |
643 | } else if (!(issue_flags & IO_URING_F_UNLOCKED)) { |
644 | entry = io_alloc_cache_get(&ctx->apoll_cache); | |
645 | if (entry == NULL) | |
646 | goto alloc_apoll; | |
9b797a37 | 647 | apoll = container_of(entry, struct async_poll, cache); |
5204aa8c | 648 | } else { |
df730ec2 | 649 | alloc_apoll: |
5204aa8c PB |
650 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); |
651 | if (unlikely(!apoll)) | |
652 | return NULL; | |
653 | } | |
654 | apoll->double_poll = NULL; | |
655 | req->apoll = apoll; | |
656 | return apoll; | |
657 | } | |
658 | ||
329061d3 JA |
659 | int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) |
660 | { | |
661 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
329061d3 JA |
662 | struct async_poll *apoll; |
663 | struct io_poll_table ipt; | |
b9ba8a44 | 664 | __poll_t mask = POLLPRI | POLLERR | EPOLLET; |
329061d3 JA |
665 | int ret; |
666 | ||
9ca9fb24 PB |
667 | /* |
668 | * apoll requests already grab the mutex to complete in the tw handler, | |
669 | * so removal from the mutex-backed hash is free, use it by default. | |
670 | */ | |
e8375e43 | 671 | req->flags |= REQ_F_HASH_LOCKED; |
9ca9fb24 | 672 | |
329061d3 JA |
673 | if (!def->pollin && !def->pollout) |
674 | return IO_APOLL_ABORTED; | |
675 | if (!file_can_poll(req->file)) | |
676 | return IO_APOLL_ABORTED; | |
677 | if ((req->flags & (REQ_F_POLLED|REQ_F_PARTIAL_IO)) == REQ_F_POLLED) | |
678 | return IO_APOLL_ABORTED; | |
679 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) | |
680 | mask |= EPOLLONESHOT; | |
681 | ||
682 | if (def->pollin) { | |
683 | mask |= EPOLLIN | EPOLLRDNORM; | |
684 | ||
685 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
686 | if (req->flags & REQ_F_CLEAR_POLLIN) | |
687 | mask &= ~EPOLLIN; | |
688 | } else { | |
689 | mask |= EPOLLOUT | EPOLLWRNORM; | |
690 | } | |
691 | if (def->poll_exclusive) | |
692 | mask |= EPOLLEXCLUSIVE; | |
5204aa8c PB |
693 | |
694 | apoll = io_req_alloc_apoll(req, issue_flags); | |
695 | if (!apoll) | |
696 | return IO_APOLL_ABORTED; | |
329061d3 JA |
697 | req->flags |= REQ_F_POLLED; |
698 | ipt.pt._qproc = io_async_queue_proc; | |
699 | ||
700 | io_kbuf_recycle(req, issue_flags); | |
701 | ||
49f1c68e | 702 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, issue_flags); |
de08356f PB |
703 | if (ret) |
704 | return ret > 0 ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
48863ffd | 705 | trace_io_uring_poll_arm(req, mask, apoll->poll.events); |
329061d3 JA |
706 | return IO_APOLL_OK; |
707 | } | |
708 | ||
9ca9fb24 PB |
709 | static __cold bool io_poll_remove_all_table(struct task_struct *tsk, |
710 | struct io_hash_table *table, | |
711 | bool cancel_all) | |
329061d3 | 712 | { |
e6f89be6 | 713 | unsigned nr_buckets = 1U << table->hash_bits; |
329061d3 JA |
714 | struct hlist_node *tmp; |
715 | struct io_kiocb *req; | |
716 | bool found = false; | |
717 | int i; | |
718 | ||
e6f89be6 PB |
719 | for (i = 0; i < nr_buckets; i++) { |
720 | struct io_hash_bucket *hb = &table->hbs[i]; | |
329061d3 | 721 | |
38513c46 HX |
722 | spin_lock(&hb->lock); |
723 | hlist_for_each_entry_safe(req, tmp, &hb->list, hash_node) { | |
329061d3 JA |
724 | if (io_match_task_safe(req, tsk, cancel_all)) { |
725 | hlist_del_init(&req->hash_node); | |
726 | io_poll_cancel_req(req); | |
727 | found = true; | |
728 | } | |
729 | } | |
38513c46 | 730 | spin_unlock(&hb->lock); |
329061d3 | 731 | } |
329061d3 JA |
732 | return found; |
733 | } | |
734 | ||
9ca9fb24 PB |
735 | /* |
736 | * Returns true if we found and killed one or more poll requests | |
737 | */ | |
738 | __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
739 | bool cancel_all) | |
740 | __must_hold(&ctx->uring_lock) | |
741 | { | |
b321823a PB |
742 | bool ret; |
743 | ||
744 | ret = io_poll_remove_all_table(tsk, &ctx->cancel_table, cancel_all); | |
745 | ret |= io_poll_remove_all_table(tsk, &ctx->cancel_table_locked, cancel_all); | |
746 | return ret; | |
9ca9fb24 PB |
747 | } |
748 | ||
329061d3 | 749 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only, |
1ab1edb0 | 750 | struct io_cancel_data *cd, |
e6f89be6 | 751 | struct io_hash_table *table, |
1ab1edb0 | 752 | struct io_hash_bucket **out_bucket) |
329061d3 | 753 | { |
329061d3 | 754 | struct io_kiocb *req; |
e6f89be6 PB |
755 | u32 index = hash_long(cd->data, table->hash_bits); |
756 | struct io_hash_bucket *hb = &table->hbs[index]; | |
329061d3 | 757 | |
1ab1edb0 PB |
758 | *out_bucket = NULL; |
759 | ||
38513c46 HX |
760 | spin_lock(&hb->lock); |
761 | hlist_for_each_entry(req, &hb->list, hash_node) { | |
329061d3 JA |
762 | if (cd->data != req->cqe.user_data) |
763 | continue; | |
764 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) | |
765 | continue; | |
766 | if (cd->flags & IORING_ASYNC_CANCEL_ALL) { | |
767 | if (cd->seq == req->work.cancel_seq) | |
768 | continue; | |
769 | req->work.cancel_seq = cd->seq; | |
770 | } | |
1ab1edb0 | 771 | *out_bucket = hb; |
329061d3 JA |
772 | return req; |
773 | } | |
38513c46 | 774 | spin_unlock(&hb->lock); |
329061d3 JA |
775 | return NULL; |
776 | } | |
777 | ||
778 | static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx, | |
1ab1edb0 | 779 | struct io_cancel_data *cd, |
e6f89be6 | 780 | struct io_hash_table *table, |
1ab1edb0 | 781 | struct io_hash_bucket **out_bucket) |
329061d3 | 782 | { |
e6f89be6 | 783 | unsigned nr_buckets = 1U << table->hash_bits; |
329061d3 JA |
784 | struct io_kiocb *req; |
785 | int i; | |
786 | ||
1ab1edb0 PB |
787 | *out_bucket = NULL; |
788 | ||
e6f89be6 PB |
789 | for (i = 0; i < nr_buckets; i++) { |
790 | struct io_hash_bucket *hb = &table->hbs[i]; | |
329061d3 | 791 | |
38513c46 HX |
792 | spin_lock(&hb->lock); |
793 | hlist_for_each_entry(req, &hb->list, hash_node) { | |
329061d3 JA |
794 | if (!(cd->flags & IORING_ASYNC_CANCEL_ANY) && |
795 | req->file != cd->file) | |
796 | continue; | |
797 | if (cd->seq == req->work.cancel_seq) | |
798 | continue; | |
799 | req->work.cancel_seq = cd->seq; | |
1ab1edb0 | 800 | *out_bucket = hb; |
329061d3 JA |
801 | return req; |
802 | } | |
38513c46 | 803 | spin_unlock(&hb->lock); |
329061d3 JA |
804 | } |
805 | return NULL; | |
806 | } | |
807 | ||
9ca9fb24 | 808 | static int io_poll_disarm(struct io_kiocb *req) |
329061d3 | 809 | { |
9ca9fb24 PB |
810 | if (!req) |
811 | return -ENOENT; | |
329061d3 | 812 | if (!io_poll_get_ownership(req)) |
9ca9fb24 | 813 | return -EALREADY; |
329061d3 JA |
814 | io_poll_remove_entries(req); |
815 | hash_del(&req->hash_node); | |
9ca9fb24 | 816 | return 0; |
329061d3 JA |
817 | } |
818 | ||
a2cdd519 | 819 | static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd, |
e6f89be6 | 820 | struct io_hash_table *table) |
329061d3 | 821 | { |
1ab1edb0 | 822 | struct io_hash_bucket *bucket; |
329061d3 JA |
823 | struct io_kiocb *req; |
824 | ||
825 | if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_ANY)) | |
e6f89be6 | 826 | req = io_poll_file_find(ctx, cd, table, &bucket); |
329061d3 | 827 | else |
e6f89be6 | 828 | req = io_poll_find(ctx, false, cd, table, &bucket); |
1ab1edb0 PB |
829 | |
830 | if (req) | |
831 | io_poll_cancel_req(req); | |
832 | if (bucket) | |
833 | spin_unlock(&bucket->lock); | |
834 | return req ? 0 : -ENOENT; | |
329061d3 JA |
835 | } |
836 | ||
5d7943d9 PB |
837 | int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd, |
838 | unsigned issue_flags) | |
a2cdd519 | 839 | { |
9ca9fb24 PB |
840 | int ret; |
841 | ||
842 | ret = __io_poll_cancel(ctx, cd, &ctx->cancel_table); | |
843 | if (ret != -ENOENT) | |
844 | return ret; | |
845 | ||
846 | io_ring_submit_lock(ctx, issue_flags); | |
847 | ret = __io_poll_cancel(ctx, cd, &ctx->cancel_table_locked); | |
848 | io_ring_submit_unlock(ctx, issue_flags); | |
849 | return ret; | |
a2cdd519 PB |
850 | } |
851 | ||
329061d3 JA |
852 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
853 | unsigned int flags) | |
854 | { | |
855 | u32 events; | |
856 | ||
857 | events = READ_ONCE(sqe->poll32_events); | |
858 | #ifdef __BIG_ENDIAN | |
859 | events = swahw32(events); | |
860 | #endif | |
861 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
862 | events |= EPOLLONESHOT; | |
b9ba8a44 JA |
863 | if (!(flags & IORING_POLL_ADD_LEVEL)) |
864 | events |= EPOLLET; | |
865 | return demangle_poll(events) | | |
866 | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT|EPOLLET)); | |
329061d3 JA |
867 | } |
868 | ||
869 | int io_poll_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
870 | { | |
f2ccb5ae | 871 | struct io_poll_update *upd = io_kiocb_to_cmd(req, struct io_poll_update); |
329061d3 JA |
872 | u32 flags; |
873 | ||
874 | if (sqe->buf_index || sqe->splice_fd_in) | |
875 | return -EINVAL; | |
876 | flags = READ_ONCE(sqe->len); | |
877 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
878 | IORING_POLL_ADD_MULTI)) | |
879 | return -EINVAL; | |
880 | /* meaningless without update */ | |
881 | if (flags == IORING_POLL_ADD_MULTI) | |
882 | return -EINVAL; | |
883 | ||
884 | upd->old_user_data = READ_ONCE(sqe->addr); | |
885 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
886 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
887 | ||
888 | upd->new_user_data = READ_ONCE(sqe->off); | |
889 | if (!upd->update_user_data && upd->new_user_data) | |
890 | return -EINVAL; | |
891 | if (upd->update_events) | |
892 | upd->events = io_poll_parse_events(sqe, flags); | |
893 | else if (sqe->poll32_events) | |
894 | return -EINVAL; | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
900 | { | |
f2ccb5ae | 901 | struct io_poll *poll = io_kiocb_to_cmd(req, struct io_poll); |
329061d3 JA |
902 | u32 flags; |
903 | ||
904 | if (sqe->buf_index || sqe->off || sqe->addr) | |
905 | return -EINVAL; | |
906 | flags = READ_ONCE(sqe->len); | |
d59bd748 | 907 | if (flags & ~IORING_POLL_ADD_MULTI) |
329061d3 JA |
908 | return -EINVAL; |
909 | if ((flags & IORING_POLL_ADD_MULTI) && (req->flags & REQ_F_CQE_SKIP)) | |
910 | return -EINVAL; | |
911 | ||
329061d3 JA |
912 | poll->events = io_poll_parse_events(sqe, flags); |
913 | return 0; | |
914 | } | |
915 | ||
916 | int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) | |
917 | { | |
f2ccb5ae | 918 | struct io_poll *poll = io_kiocb_to_cmd(req, struct io_poll); |
329061d3 JA |
919 | struct io_poll_table ipt; |
920 | int ret; | |
921 | ||
922 | ipt.pt._qproc = io_poll_queue_proc; | |
923 | ||
9ca9fb24 PB |
924 | /* |
925 | * If sqpoll or single issuer, there is no contention for ->uring_lock | |
926 | * and we'll end up holding it in tw handlers anyway. | |
927 | */ | |
e8375e43 | 928 | if (req->ctx->flags & (IORING_SETUP_SQPOLL|IORING_SETUP_SINGLE_ISSUER)) |
9ca9fb24 | 929 | req->flags |= REQ_F_HASH_LOCKED; |
9ca9fb24 | 930 | |
49f1c68e | 931 | ret = __io_arm_poll_handler(req, poll, &ipt, poll->events, issue_flags); |
de08356f | 932 | if (ret > 0) { |
063a0079 | 933 | io_req_set_res(req, ipt.result_mask, 0); |
329061d3 JA |
934 | return IOU_OK; |
935 | } | |
de08356f | 936 | return ret ?: IOU_ISSUE_SKIP_COMPLETE; |
329061d3 JA |
937 | } |
938 | ||
939 | int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) | |
940 | { | |
f2ccb5ae | 941 | struct io_poll_update *poll_update = io_kiocb_to_cmd(req, struct io_poll_update); |
329061d3 JA |
942 | struct io_cancel_data cd = { .data = poll_update->old_user_data, }; |
943 | struct io_ring_ctx *ctx = req->ctx; | |
1ab1edb0 | 944 | struct io_hash_bucket *bucket; |
329061d3 JA |
945 | struct io_kiocb *preq; |
946 | int ret2, ret = 0; | |
947 | bool locked; | |
948 | ||
e6f89be6 | 949 | preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket); |
9ca9fb24 | 950 | ret2 = io_poll_disarm(preq); |
1ab1edb0 PB |
951 | if (bucket) |
952 | spin_unlock(&bucket->lock); | |
9ca9fb24 PB |
953 | if (!ret2) |
954 | goto found; | |
955 | if (ret2 != -ENOENT) { | |
956 | ret = ret2; | |
38513c46 HX |
957 | goto out; |
958 | } | |
9ca9fb24 PB |
959 | |
960 | io_ring_submit_lock(ctx, issue_flags); | |
961 | preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table_locked, &bucket); | |
962 | ret2 = io_poll_disarm(preq); | |
963 | if (bucket) | |
964 | spin_unlock(&bucket->lock); | |
965 | io_ring_submit_unlock(ctx, issue_flags); | |
966 | if (ret2) { | |
967 | ret = ret2; | |
329061d3 JA |
968 | goto out; |
969 | } | |
329061d3 | 970 | |
9ca9fb24 | 971 | found: |
bce5d70c PB |
972 | if (WARN_ON_ONCE(preq->opcode != IORING_OP_POLL_ADD)) { |
973 | ret = -EFAULT; | |
974 | goto out; | |
975 | } | |
976 | ||
329061d3 JA |
977 | if (poll_update->update_events || poll_update->update_user_data) { |
978 | /* only mask one event flags, keep behavior flags */ | |
979 | if (poll_update->update_events) { | |
f2ccb5ae | 980 | struct io_poll *poll = io_kiocb_to_cmd(preq, struct io_poll); |
329061d3 JA |
981 | |
982 | poll->events &= ~0xffff; | |
983 | poll->events |= poll_update->events & 0xffff; | |
984 | poll->events |= IO_POLL_UNMASK; | |
985 | } | |
986 | if (poll_update->update_user_data) | |
987 | preq->cqe.user_data = poll_update->new_user_data; | |
988 | ||
989 | ret2 = io_poll_add(preq, issue_flags); | |
990 | /* successfully updated, don't complete poll request */ | |
991 | if (!ret2 || ret2 == -EIOCBQUEUED) | |
992 | goto out; | |
993 | } | |
994 | ||
995 | req_set_fail(preq); | |
996 | io_req_set_res(preq, -ECANCELED, 0); | |
997 | locked = !(issue_flags & IO_URING_F_UNLOCKED); | |
998 | io_req_task_complete(preq, &locked); | |
999 | out: | |
1000 | if (ret < 0) { | |
1001 | req_set_fail(req); | |
1002 | return ret; | |
1003 | } | |
1004 | /* complete update request, we're done with it */ | |
1005 | io_req_set_res(req, ret, 0); | |
1006 | return IOU_OK; | |
1007 | } | |
9da7471e | 1008 | |
9b797a37 | 1009 | void io_apoll_cache_free(struct io_cache_entry *entry) |
9da7471e | 1010 | { |
9b797a37 | 1011 | kfree(container_of(entry, struct async_poll, cache)); |
9da7471e | 1012 | } |