Commit | Line | Data |
---|---|---|
334f485d MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
334f485d MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/init.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/poll.h> | |
14 | #include <linux/uio.h> | |
15 | #include <linux/miscdevice.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/file.h> | |
18 | #include <linux/slab.h> | |
19 | ||
20 | MODULE_ALIAS_MISCDEV(FUSE_MINOR); | |
21 | ||
e18b890b | 22 | static struct kmem_cache *fuse_req_cachep; |
334f485d | 23 | |
8bfc016d | 24 | static struct fuse_conn *fuse_get_conn(struct file *file) |
334f485d | 25 | { |
0720b315 MS |
26 | /* |
27 | * Lockless access is OK, because file->private data is set | |
28 | * once during mount and is valid until the file is released. | |
29 | */ | |
30 | return file->private_data; | |
334f485d MS |
31 | } |
32 | ||
8bfc016d | 33 | static void fuse_request_init(struct fuse_req *req) |
334f485d MS |
34 | { |
35 | memset(req, 0, sizeof(*req)); | |
36 | INIT_LIST_HEAD(&req->list); | |
a4d27e75 | 37 | INIT_LIST_HEAD(&req->intr_entry); |
334f485d MS |
38 | init_waitqueue_head(&req->waitq); |
39 | atomic_set(&req->count, 1); | |
40 | } | |
41 | ||
42 | struct fuse_req *fuse_request_alloc(void) | |
43 | { | |
e94b1766 | 44 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_KERNEL); |
334f485d MS |
45 | if (req) |
46 | fuse_request_init(req); | |
47 | return req; | |
48 | } | |
49 | ||
3be5a52b MS |
50 | struct fuse_req *fuse_request_alloc_nofs(void) |
51 | { | |
52 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_NOFS); | |
53 | if (req) | |
54 | fuse_request_init(req); | |
55 | return req; | |
56 | } | |
57 | ||
334f485d MS |
58 | void fuse_request_free(struct fuse_req *req) |
59 | { | |
60 | kmem_cache_free(fuse_req_cachep, req); | |
61 | } | |
62 | ||
8bfc016d | 63 | static void block_sigs(sigset_t *oldset) |
334f485d MS |
64 | { |
65 | sigset_t mask; | |
66 | ||
67 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
68 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
69 | } | |
70 | ||
8bfc016d | 71 | static void restore_sigs(sigset_t *oldset) |
334f485d MS |
72 | { |
73 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
74 | } | |
75 | ||
334f485d MS |
76 | static void __fuse_get_request(struct fuse_req *req) |
77 | { | |
78 | atomic_inc(&req->count); | |
79 | } | |
80 | ||
81 | /* Must be called with > 1 refcount */ | |
82 | static void __fuse_put_request(struct fuse_req *req) | |
83 | { | |
84 | BUG_ON(atomic_read(&req->count) < 2); | |
85 | atomic_dec(&req->count); | |
86 | } | |
87 | ||
33649c91 MS |
88 | static void fuse_req_init_context(struct fuse_req *req) |
89 | { | |
2186a71c DH |
90 | req->in.h.uid = current_fsuid(); |
91 | req->in.h.gid = current_fsgid(); | |
33649c91 MS |
92 | req->in.h.pid = current->pid; |
93 | } | |
94 | ||
ce1d5a49 | 95 | struct fuse_req *fuse_get_req(struct fuse_conn *fc) |
334f485d | 96 | { |
08a53cdc MS |
97 | struct fuse_req *req; |
98 | sigset_t oldset; | |
9bc5ddda | 99 | int intr; |
08a53cdc MS |
100 | int err; |
101 | ||
9bc5ddda | 102 | atomic_inc(&fc->num_waiting); |
08a53cdc | 103 | block_sigs(&oldset); |
9bc5ddda | 104 | intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked); |
08a53cdc | 105 | restore_sigs(&oldset); |
9bc5ddda MS |
106 | err = -EINTR; |
107 | if (intr) | |
108 | goto out; | |
08a53cdc | 109 | |
51eb01e7 MS |
110 | err = -ENOTCONN; |
111 | if (!fc->connected) | |
112 | goto out; | |
113 | ||
08a53cdc | 114 | req = fuse_request_alloc(); |
9bc5ddda | 115 | err = -ENOMEM; |
ce1d5a49 | 116 | if (!req) |
9bc5ddda | 117 | goto out; |
334f485d | 118 | |
33649c91 | 119 | fuse_req_init_context(req); |
9bc5ddda | 120 | req->waiting = 1; |
334f485d | 121 | return req; |
9bc5ddda MS |
122 | |
123 | out: | |
124 | atomic_dec(&fc->num_waiting); | |
125 | return ERR_PTR(err); | |
334f485d MS |
126 | } |
127 | ||
33649c91 MS |
128 | /* |
129 | * Return request in fuse_file->reserved_req. However that may | |
130 | * currently be in use. If that is the case, wait for it to become | |
131 | * available. | |
132 | */ | |
133 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, | |
134 | struct file *file) | |
135 | { | |
136 | struct fuse_req *req = NULL; | |
137 | struct fuse_file *ff = file->private_data; | |
138 | ||
139 | do { | |
de5e3dec | 140 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
33649c91 MS |
141 | spin_lock(&fc->lock); |
142 | if (ff->reserved_req) { | |
143 | req = ff->reserved_req; | |
144 | ff->reserved_req = NULL; | |
145 | get_file(file); | |
146 | req->stolen_file = file; | |
147 | } | |
148 | spin_unlock(&fc->lock); | |
149 | } while (!req); | |
150 | ||
151 | return req; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Put stolen request back into fuse_file->reserved_req | |
156 | */ | |
157 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) | |
158 | { | |
159 | struct file *file = req->stolen_file; | |
160 | struct fuse_file *ff = file->private_data; | |
161 | ||
162 | spin_lock(&fc->lock); | |
163 | fuse_request_init(req); | |
164 | BUG_ON(ff->reserved_req); | |
165 | ff->reserved_req = req; | |
de5e3dec | 166 | wake_up_all(&fc->reserved_req_waitq); |
33649c91 MS |
167 | spin_unlock(&fc->lock); |
168 | fput(file); | |
169 | } | |
170 | ||
171 | /* | |
172 | * Gets a requests for a file operation, always succeeds | |
173 | * | |
174 | * This is used for sending the FLUSH request, which must get to | |
175 | * userspace, due to POSIX locks which may need to be unlocked. | |
176 | * | |
177 | * If allocation fails due to OOM, use the reserved request in | |
178 | * fuse_file. | |
179 | * | |
180 | * This is very unlikely to deadlock accidentally, since the | |
181 | * filesystem should not have it's own file open. If deadlock is | |
182 | * intentional, it can still be broken by "aborting" the filesystem. | |
183 | */ | |
184 | struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file) | |
185 | { | |
186 | struct fuse_req *req; | |
187 | ||
188 | atomic_inc(&fc->num_waiting); | |
189 | wait_event(fc->blocked_waitq, !fc->blocked); | |
190 | req = fuse_request_alloc(); | |
191 | if (!req) | |
192 | req = get_reserved_req(fc, file); | |
193 | ||
194 | fuse_req_init_context(req); | |
195 | req->waiting = 1; | |
196 | return req; | |
197 | } | |
198 | ||
334f485d | 199 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
7128ec2a MS |
200 | { |
201 | if (atomic_dec_and_test(&req->count)) { | |
9bc5ddda MS |
202 | if (req->waiting) |
203 | atomic_dec(&fc->num_waiting); | |
33649c91 MS |
204 | |
205 | if (req->stolen_file) | |
206 | put_reserved_req(fc, req); | |
207 | else | |
208 | fuse_request_free(req); | |
7128ec2a MS |
209 | } |
210 | } | |
211 | ||
d12def1b MS |
212 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
213 | { | |
214 | unsigned nbytes = 0; | |
215 | unsigned i; | |
216 | ||
217 | for (i = 0; i < numargs; i++) | |
218 | nbytes += args[i].size; | |
219 | ||
220 | return nbytes; | |
221 | } | |
222 | ||
223 | static u64 fuse_get_unique(struct fuse_conn *fc) | |
224 | { | |
225 | fc->reqctr++; | |
226 | /* zero is special */ | |
227 | if (fc->reqctr == 0) | |
228 | fc->reqctr = 1; | |
229 | ||
230 | return fc->reqctr; | |
231 | } | |
232 | ||
233 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) | |
234 | { | |
235 | req->in.h.unique = fuse_get_unique(fc); | |
236 | req->in.h.len = sizeof(struct fuse_in_header) + | |
237 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); | |
238 | list_add_tail(&req->list, &fc->pending); | |
239 | req->state = FUSE_REQ_PENDING; | |
240 | if (!req->waiting) { | |
241 | req->waiting = 1; | |
242 | atomic_inc(&fc->num_waiting); | |
243 | } | |
244 | wake_up(&fc->waitq); | |
245 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
246 | } | |
247 | ||
248 | static void flush_bg_queue(struct fuse_conn *fc) | |
249 | { | |
250 | while (fc->active_background < FUSE_MAX_BACKGROUND && | |
251 | !list_empty(&fc->bg_queue)) { | |
252 | struct fuse_req *req; | |
253 | ||
254 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); | |
255 | list_del(&req->list); | |
256 | fc->active_background++; | |
257 | queue_request(fc, req); | |
258 | } | |
259 | } | |
260 | ||
334f485d MS |
261 | /* |
262 | * This function is called when a request is finished. Either a reply | |
f9a2842e | 263 | * has arrived or it was aborted (and not yet sent) or some error |
f43b155a | 264 | * occurred during communication with userspace, or the device file |
51eb01e7 MS |
265 | * was closed. The requester thread is woken up (if still waiting), |
266 | * the 'end' callback is called if given, else the reference to the | |
267 | * request is released | |
7128ec2a | 268 | * |
d7133114 | 269 | * Called with fc->lock, unlocks it |
334f485d MS |
270 | */ |
271 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) | |
5d9ec854 | 272 | __releases(&fc->lock) |
334f485d | 273 | { |
51eb01e7 MS |
274 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
275 | req->end = NULL; | |
d77a1d5b | 276 | list_del(&req->list); |
a4d27e75 | 277 | list_del(&req->intr_entry); |
83cfd493 | 278 | req->state = FUSE_REQ_FINISHED; |
51eb01e7 MS |
279 | if (req->background) { |
280 | if (fc->num_background == FUSE_MAX_BACKGROUND) { | |
281 | fc->blocked = 0; | |
282 | wake_up_all(&fc->blocked_waitq); | |
283 | } | |
26c36791 MS |
284 | if (fc->num_background == FUSE_CONGESTION_THRESHOLD && |
285 | fc->connected) { | |
f92b99b9 MS |
286 | clear_bdi_congested(&fc->bdi, READ); |
287 | clear_bdi_congested(&fc->bdi, WRITE); | |
288 | } | |
51eb01e7 | 289 | fc->num_background--; |
d12def1b MS |
290 | fc->active_background--; |
291 | flush_bg_queue(fc); | |
334f485d | 292 | } |
51eb01e7 | 293 | spin_unlock(&fc->lock); |
51eb01e7 MS |
294 | wake_up(&req->waitq); |
295 | if (end) | |
296 | end(fc, req); | |
e9bb09dd | 297 | fuse_put_request(fc, req); |
334f485d MS |
298 | } |
299 | ||
a4d27e75 MS |
300 | static void wait_answer_interruptible(struct fuse_conn *fc, |
301 | struct fuse_req *req) | |
5d9ec854 HH |
302 | __releases(&fc->lock) |
303 | __acquires(&fc->lock) | |
a4d27e75 MS |
304 | { |
305 | if (signal_pending(current)) | |
306 | return; | |
307 | ||
308 | spin_unlock(&fc->lock); | |
309 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); | |
310 | spin_lock(&fc->lock); | |
311 | } | |
312 | ||
313 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) | |
314 | { | |
315 | list_add_tail(&req->intr_entry, &fc->interrupts); | |
316 | wake_up(&fc->waitq); | |
317 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
318 | } | |
319 | ||
7c352bdf | 320 | static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) |
5d9ec854 HH |
321 | __releases(&fc->lock) |
322 | __acquires(&fc->lock) | |
334f485d | 323 | { |
a4d27e75 MS |
324 | if (!fc->no_interrupt) { |
325 | /* Any signal may interrupt this */ | |
326 | wait_answer_interruptible(fc, req); | |
334f485d | 327 | |
a4d27e75 MS |
328 | if (req->aborted) |
329 | goto aborted; | |
330 | if (req->state == FUSE_REQ_FINISHED) | |
331 | return; | |
332 | ||
333 | req->interrupted = 1; | |
334 | if (req->state == FUSE_REQ_SENT) | |
335 | queue_interrupt(fc, req); | |
336 | } | |
337 | ||
a131de0a | 338 | if (!req->force) { |
a4d27e75 MS |
339 | sigset_t oldset; |
340 | ||
341 | /* Only fatal signals may interrupt this */ | |
51eb01e7 | 342 | block_sigs(&oldset); |
a4d27e75 | 343 | wait_answer_interruptible(fc, req); |
51eb01e7 | 344 | restore_sigs(&oldset); |
a131de0a MS |
345 | |
346 | if (req->aborted) | |
347 | goto aborted; | |
348 | if (req->state == FUSE_REQ_FINISHED) | |
349 | return; | |
350 | ||
351 | /* Request is not yet in userspace, bail out */ | |
352 | if (req->state == FUSE_REQ_PENDING) { | |
353 | list_del(&req->list); | |
354 | __fuse_put_request(req); | |
355 | req->out.h.error = -EINTR; | |
356 | return; | |
357 | } | |
51eb01e7 | 358 | } |
334f485d | 359 | |
a131de0a MS |
360 | /* |
361 | * Either request is already in userspace, or it was forced. | |
362 | * Wait it out. | |
363 | */ | |
364 | spin_unlock(&fc->lock); | |
365 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); | |
366 | spin_lock(&fc->lock); | |
a4d27e75 | 367 | |
a131de0a MS |
368 | if (!req->aborted) |
369 | return; | |
a4d27e75 MS |
370 | |
371 | aborted: | |
a131de0a | 372 | BUG_ON(req->state != FUSE_REQ_FINISHED); |
334f485d MS |
373 | if (req->locked) { |
374 | /* This is uninterruptible sleep, because data is | |
375 | being copied to/from the buffers of req. During | |
376 | locked state, there mustn't be any filesystem | |
377 | operation (e.g. page fault), since that could lead | |
378 | to deadlock */ | |
d7133114 | 379 | spin_unlock(&fc->lock); |
334f485d | 380 | wait_event(req->waitq, !req->locked); |
d7133114 | 381 | spin_lock(&fc->lock); |
334f485d | 382 | } |
334f485d MS |
383 | } |
384 | ||
b93f858a | 385 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
386 | { |
387 | req->isreply = 1; | |
d7133114 | 388 | spin_lock(&fc->lock); |
1e9a4ed9 | 389 | if (!fc->connected) |
334f485d MS |
390 | req->out.h.error = -ENOTCONN; |
391 | else if (fc->conn_error) | |
392 | req->out.h.error = -ECONNREFUSED; | |
393 | else { | |
394 | queue_request(fc, req); | |
395 | /* acquire extra reference, since request is still needed | |
396 | after request_end() */ | |
397 | __fuse_get_request(req); | |
398 | ||
7c352bdf | 399 | request_wait_answer(fc, req); |
334f485d | 400 | } |
d7133114 | 401 | spin_unlock(&fc->lock); |
334f485d MS |
402 | } |
403 | ||
b93f858a TH |
404 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
405 | struct fuse_req *req) | |
d12def1b MS |
406 | { |
407 | req->background = 1; | |
408 | fc->num_background++; | |
409 | if (fc->num_background == FUSE_MAX_BACKGROUND) | |
410 | fc->blocked = 1; | |
411 | if (fc->num_background == FUSE_CONGESTION_THRESHOLD) { | |
412 | set_bdi_congested(&fc->bdi, READ); | |
413 | set_bdi_congested(&fc->bdi, WRITE); | |
414 | } | |
415 | list_add_tail(&req->list, &fc->bg_queue); | |
416 | flush_bg_queue(fc); | |
417 | } | |
418 | ||
b93f858a | 419 | static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 420 | { |
d7133114 | 421 | spin_lock(&fc->lock); |
1e9a4ed9 | 422 | if (fc->connected) { |
b93f858a | 423 | fuse_request_send_nowait_locked(fc, req); |
d7133114 | 424 | spin_unlock(&fc->lock); |
334f485d MS |
425 | } else { |
426 | req->out.h.error = -ENOTCONN; | |
427 | request_end(fc, req); | |
428 | } | |
429 | } | |
430 | ||
b93f858a | 431 | void fuse_request_send_noreply(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
432 | { |
433 | req->isreply = 0; | |
b93f858a | 434 | fuse_request_send_nowait(fc, req); |
334f485d MS |
435 | } |
436 | ||
b93f858a | 437 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
438 | { |
439 | req->isreply = 1; | |
b93f858a | 440 | fuse_request_send_nowait(fc, req); |
334f485d MS |
441 | } |
442 | ||
3be5a52b MS |
443 | /* |
444 | * Called under fc->lock | |
445 | * | |
446 | * fc->connected must have been checked previously | |
447 | */ | |
b93f858a TH |
448 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
449 | struct fuse_req *req) | |
3be5a52b MS |
450 | { |
451 | req->isreply = 1; | |
b93f858a | 452 | fuse_request_send_nowait_locked(fc, req); |
3be5a52b MS |
453 | } |
454 | ||
334f485d MS |
455 | /* |
456 | * Lock the request. Up to the next unlock_request() there mustn't be | |
457 | * anything that could cause a page-fault. If the request was already | |
f9a2842e | 458 | * aborted bail out. |
334f485d | 459 | */ |
d7133114 | 460 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
461 | { |
462 | int err = 0; | |
463 | if (req) { | |
d7133114 | 464 | spin_lock(&fc->lock); |
f9a2842e | 465 | if (req->aborted) |
334f485d MS |
466 | err = -ENOENT; |
467 | else | |
468 | req->locked = 1; | |
d7133114 | 469 | spin_unlock(&fc->lock); |
334f485d MS |
470 | } |
471 | return err; | |
472 | } | |
473 | ||
474 | /* | |
f9a2842e | 475 | * Unlock request. If it was aborted during being locked, the |
334f485d MS |
476 | * requester thread is currently waiting for it to be unlocked, so |
477 | * wake it up. | |
478 | */ | |
d7133114 | 479 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
480 | { |
481 | if (req) { | |
d7133114 | 482 | spin_lock(&fc->lock); |
334f485d | 483 | req->locked = 0; |
f9a2842e | 484 | if (req->aborted) |
334f485d | 485 | wake_up(&req->waitq); |
d7133114 | 486 | spin_unlock(&fc->lock); |
334f485d MS |
487 | } |
488 | } | |
489 | ||
490 | struct fuse_copy_state { | |
d7133114 | 491 | struct fuse_conn *fc; |
334f485d MS |
492 | int write; |
493 | struct fuse_req *req; | |
494 | const struct iovec *iov; | |
495 | unsigned long nr_segs; | |
496 | unsigned long seglen; | |
497 | unsigned long addr; | |
498 | struct page *pg; | |
499 | void *mapaddr; | |
500 | void *buf; | |
501 | unsigned len; | |
502 | }; | |
503 | ||
d7133114 MS |
504 | static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc, |
505 | int write, struct fuse_req *req, | |
506 | const struct iovec *iov, unsigned long nr_segs) | |
334f485d MS |
507 | { |
508 | memset(cs, 0, sizeof(*cs)); | |
d7133114 | 509 | cs->fc = fc; |
334f485d MS |
510 | cs->write = write; |
511 | cs->req = req; | |
512 | cs->iov = iov; | |
513 | cs->nr_segs = nr_segs; | |
514 | } | |
515 | ||
516 | /* Unmap and put previous page of userspace buffer */ | |
8bfc016d | 517 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
334f485d MS |
518 | { |
519 | if (cs->mapaddr) { | |
520 | kunmap_atomic(cs->mapaddr, KM_USER0); | |
521 | if (cs->write) { | |
522 | flush_dcache_page(cs->pg); | |
523 | set_page_dirty_lock(cs->pg); | |
524 | } | |
525 | put_page(cs->pg); | |
526 | cs->mapaddr = NULL; | |
527 | } | |
528 | } | |
529 | ||
530 | /* | |
531 | * Get another pagefull of userspace buffer, and map it to kernel | |
532 | * address space, and lock request | |
533 | */ | |
534 | static int fuse_copy_fill(struct fuse_copy_state *cs) | |
535 | { | |
536 | unsigned long offset; | |
537 | int err; | |
538 | ||
d7133114 | 539 | unlock_request(cs->fc, cs->req); |
334f485d MS |
540 | fuse_copy_finish(cs); |
541 | if (!cs->seglen) { | |
542 | BUG_ON(!cs->nr_segs); | |
543 | cs->seglen = cs->iov[0].iov_len; | |
544 | cs->addr = (unsigned long) cs->iov[0].iov_base; | |
1729a16c MS |
545 | cs->iov++; |
546 | cs->nr_segs--; | |
334f485d MS |
547 | } |
548 | down_read(¤t->mm->mmap_sem); | |
549 | err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0, | |
550 | &cs->pg, NULL); | |
551 | up_read(¤t->mm->mmap_sem); | |
552 | if (err < 0) | |
553 | return err; | |
554 | BUG_ON(err != 1); | |
555 | offset = cs->addr % PAGE_SIZE; | |
556 | cs->mapaddr = kmap_atomic(cs->pg, KM_USER0); | |
557 | cs->buf = cs->mapaddr + offset; | |
558 | cs->len = min(PAGE_SIZE - offset, cs->seglen); | |
559 | cs->seglen -= cs->len; | |
560 | cs->addr += cs->len; | |
561 | ||
d7133114 | 562 | return lock_request(cs->fc, cs->req); |
334f485d MS |
563 | } |
564 | ||
565 | /* Do as much copy to/from userspace buffer as we can */ | |
8bfc016d | 566 | static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size) |
334f485d MS |
567 | { |
568 | unsigned ncpy = min(*size, cs->len); | |
569 | if (val) { | |
570 | if (cs->write) | |
571 | memcpy(cs->buf, *val, ncpy); | |
572 | else | |
573 | memcpy(*val, cs->buf, ncpy); | |
574 | *val += ncpy; | |
575 | } | |
576 | *size -= ncpy; | |
577 | cs->len -= ncpy; | |
578 | cs->buf += ncpy; | |
579 | return ncpy; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Copy a page in the request to/from the userspace buffer. Must be | |
584 | * done atomically | |
585 | */ | |
8bfc016d MS |
586 | static int fuse_copy_page(struct fuse_copy_state *cs, struct page *page, |
587 | unsigned offset, unsigned count, int zeroing) | |
334f485d MS |
588 | { |
589 | if (page && zeroing && count < PAGE_SIZE) { | |
590 | void *mapaddr = kmap_atomic(page, KM_USER1); | |
591 | memset(mapaddr, 0, PAGE_SIZE); | |
592 | kunmap_atomic(mapaddr, KM_USER1); | |
593 | } | |
594 | while (count) { | |
1729a16c MS |
595 | if (!cs->len) { |
596 | int err = fuse_copy_fill(cs); | |
597 | if (err) | |
598 | return err; | |
599 | } | |
334f485d MS |
600 | if (page) { |
601 | void *mapaddr = kmap_atomic(page, KM_USER1); | |
602 | void *buf = mapaddr + offset; | |
603 | offset += fuse_copy_do(cs, &buf, &count); | |
604 | kunmap_atomic(mapaddr, KM_USER1); | |
605 | } else | |
606 | offset += fuse_copy_do(cs, NULL, &count); | |
607 | } | |
608 | if (page && !cs->write) | |
609 | flush_dcache_page(page); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | /* Copy pages in the request to/from userspace buffer */ | |
614 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, | |
615 | int zeroing) | |
616 | { | |
617 | unsigned i; | |
618 | struct fuse_req *req = cs->req; | |
619 | unsigned offset = req->page_offset; | |
620 | unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset); | |
621 | ||
622 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { | |
623 | struct page *page = req->pages[i]; | |
624 | int err = fuse_copy_page(cs, page, offset, count, zeroing); | |
625 | if (err) | |
626 | return err; | |
627 | ||
628 | nbytes -= count; | |
629 | count = min(nbytes, (unsigned) PAGE_SIZE); | |
630 | offset = 0; | |
631 | } | |
632 | return 0; | |
633 | } | |
634 | ||
635 | /* Copy a single argument in the request to/from userspace buffer */ | |
636 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) | |
637 | { | |
638 | while (size) { | |
1729a16c MS |
639 | if (!cs->len) { |
640 | int err = fuse_copy_fill(cs); | |
641 | if (err) | |
642 | return err; | |
643 | } | |
334f485d MS |
644 | fuse_copy_do(cs, &val, &size); |
645 | } | |
646 | return 0; | |
647 | } | |
648 | ||
649 | /* Copy request arguments to/from userspace buffer */ | |
650 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, | |
651 | unsigned argpages, struct fuse_arg *args, | |
652 | int zeroing) | |
653 | { | |
654 | int err = 0; | |
655 | unsigned i; | |
656 | ||
657 | for (i = 0; !err && i < numargs; i++) { | |
658 | struct fuse_arg *arg = &args[i]; | |
659 | if (i == numargs - 1 && argpages) | |
660 | err = fuse_copy_pages(cs, arg->size, zeroing); | |
661 | else | |
662 | err = fuse_copy_one(cs, arg->value, arg->size); | |
663 | } | |
664 | return err; | |
665 | } | |
666 | ||
a4d27e75 MS |
667 | static int request_pending(struct fuse_conn *fc) |
668 | { | |
669 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts); | |
670 | } | |
671 | ||
334f485d MS |
672 | /* Wait until a request is available on the pending list */ |
673 | static void request_wait(struct fuse_conn *fc) | |
5d9ec854 HH |
674 | __releases(&fc->lock) |
675 | __acquires(&fc->lock) | |
334f485d MS |
676 | { |
677 | DECLARE_WAITQUEUE(wait, current); | |
678 | ||
679 | add_wait_queue_exclusive(&fc->waitq, &wait); | |
a4d27e75 | 680 | while (fc->connected && !request_pending(fc)) { |
334f485d MS |
681 | set_current_state(TASK_INTERRUPTIBLE); |
682 | if (signal_pending(current)) | |
683 | break; | |
684 | ||
d7133114 | 685 | spin_unlock(&fc->lock); |
334f485d | 686 | schedule(); |
d7133114 | 687 | spin_lock(&fc->lock); |
334f485d MS |
688 | } |
689 | set_current_state(TASK_RUNNING); | |
690 | remove_wait_queue(&fc->waitq, &wait); | |
691 | } | |
692 | ||
a4d27e75 MS |
693 | /* |
694 | * Transfer an interrupt request to userspace | |
695 | * | |
696 | * Unlike other requests this is assembled on demand, without a need | |
697 | * to allocate a separate fuse_req structure. | |
698 | * | |
699 | * Called with fc->lock held, releases it | |
700 | */ | |
701 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_req *req, | |
702 | const struct iovec *iov, unsigned long nr_segs) | |
5d9ec854 | 703 | __releases(&fc->lock) |
a4d27e75 MS |
704 | { |
705 | struct fuse_copy_state cs; | |
706 | struct fuse_in_header ih; | |
707 | struct fuse_interrupt_in arg; | |
708 | unsigned reqsize = sizeof(ih) + sizeof(arg); | |
709 | int err; | |
710 | ||
711 | list_del_init(&req->intr_entry); | |
712 | req->intr_unique = fuse_get_unique(fc); | |
713 | memset(&ih, 0, sizeof(ih)); | |
714 | memset(&arg, 0, sizeof(arg)); | |
715 | ih.len = reqsize; | |
716 | ih.opcode = FUSE_INTERRUPT; | |
717 | ih.unique = req->intr_unique; | |
718 | arg.unique = req->in.h.unique; | |
719 | ||
720 | spin_unlock(&fc->lock); | |
721 | if (iov_length(iov, nr_segs) < reqsize) | |
722 | return -EINVAL; | |
723 | ||
724 | fuse_copy_init(&cs, fc, 1, NULL, iov, nr_segs); | |
725 | err = fuse_copy_one(&cs, &ih, sizeof(ih)); | |
726 | if (!err) | |
727 | err = fuse_copy_one(&cs, &arg, sizeof(arg)); | |
728 | fuse_copy_finish(&cs); | |
729 | ||
730 | return err ? err : reqsize; | |
731 | } | |
732 | ||
334f485d MS |
733 | /* |
734 | * Read a single request into the userspace filesystem's buffer. This | |
735 | * function waits until a request is available, then removes it from | |
736 | * the pending list and copies request data to userspace buffer. If | |
f9a2842e MS |
737 | * no reply is needed (FORGET) or request has been aborted or there |
738 | * was an error during the copying then it's finished by calling | |
334f485d MS |
739 | * request_end(). Otherwise add it to the processing list, and set |
740 | * the 'sent' flag. | |
741 | */ | |
ee0b3e67 BP |
742 | static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, |
743 | unsigned long nr_segs, loff_t pos) | |
334f485d MS |
744 | { |
745 | int err; | |
334f485d MS |
746 | struct fuse_req *req; |
747 | struct fuse_in *in; | |
748 | struct fuse_copy_state cs; | |
749 | unsigned reqsize; | |
ee0b3e67 | 750 | struct file *file = iocb->ki_filp; |
0720b315 MS |
751 | struct fuse_conn *fc = fuse_get_conn(file); |
752 | if (!fc) | |
753 | return -EPERM; | |
334f485d | 754 | |
1d3d752b | 755 | restart: |
d7133114 | 756 | spin_lock(&fc->lock); |
e5ac1d1e JD |
757 | err = -EAGAIN; |
758 | if ((file->f_flags & O_NONBLOCK) && fc->connected && | |
a4d27e75 | 759 | !request_pending(fc)) |
e5ac1d1e JD |
760 | goto err_unlock; |
761 | ||
334f485d MS |
762 | request_wait(fc); |
763 | err = -ENODEV; | |
9ba7cbba | 764 | if (!fc->connected) |
334f485d MS |
765 | goto err_unlock; |
766 | err = -ERESTARTSYS; | |
a4d27e75 | 767 | if (!request_pending(fc)) |
334f485d MS |
768 | goto err_unlock; |
769 | ||
a4d27e75 MS |
770 | if (!list_empty(&fc->interrupts)) { |
771 | req = list_entry(fc->interrupts.next, struct fuse_req, | |
772 | intr_entry); | |
773 | return fuse_read_interrupt(fc, req, iov, nr_segs); | |
774 | } | |
775 | ||
334f485d | 776 | req = list_entry(fc->pending.next, struct fuse_req, list); |
83cfd493 | 777 | req->state = FUSE_REQ_READING; |
d77a1d5b | 778 | list_move(&req->list, &fc->io); |
334f485d MS |
779 | |
780 | in = &req->in; | |
1d3d752b MS |
781 | reqsize = in->h.len; |
782 | /* If request is too large, reply with an error and restart the read */ | |
783 | if (iov_length(iov, nr_segs) < reqsize) { | |
784 | req->out.h.error = -EIO; | |
785 | /* SETXATTR is special, since it may contain too large data */ | |
786 | if (in->h.opcode == FUSE_SETXATTR) | |
787 | req->out.h.error = -E2BIG; | |
788 | request_end(fc, req); | |
789 | goto restart; | |
334f485d | 790 | } |
d7133114 MS |
791 | spin_unlock(&fc->lock); |
792 | fuse_copy_init(&cs, fc, 1, req, iov, nr_segs); | |
1d3d752b MS |
793 | err = fuse_copy_one(&cs, &in->h, sizeof(in->h)); |
794 | if (!err) | |
795 | err = fuse_copy_args(&cs, in->numargs, in->argpages, | |
796 | (struct fuse_arg *) in->args, 0); | |
334f485d | 797 | fuse_copy_finish(&cs); |
d7133114 | 798 | spin_lock(&fc->lock); |
334f485d | 799 | req->locked = 0; |
c9c9d7df MS |
800 | if (req->aborted) { |
801 | request_end(fc, req); | |
802 | return -ENODEV; | |
803 | } | |
334f485d | 804 | if (err) { |
c9c9d7df | 805 | req->out.h.error = -EIO; |
334f485d MS |
806 | request_end(fc, req); |
807 | return err; | |
808 | } | |
809 | if (!req->isreply) | |
810 | request_end(fc, req); | |
811 | else { | |
83cfd493 | 812 | req->state = FUSE_REQ_SENT; |
d77a1d5b | 813 | list_move_tail(&req->list, &fc->processing); |
a4d27e75 MS |
814 | if (req->interrupted) |
815 | queue_interrupt(fc, req); | |
d7133114 | 816 | spin_unlock(&fc->lock); |
334f485d MS |
817 | } |
818 | return reqsize; | |
819 | ||
820 | err_unlock: | |
d7133114 | 821 | spin_unlock(&fc->lock); |
334f485d MS |
822 | return err; |
823 | } | |
824 | ||
95668a69 TH |
825 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
826 | struct fuse_copy_state *cs) | |
827 | { | |
828 | struct fuse_notify_poll_wakeup_out outarg; | |
f6d47a17 | 829 | int err = -EINVAL; |
95668a69 TH |
830 | |
831 | if (size != sizeof(outarg)) | |
f6d47a17 | 832 | goto err; |
95668a69 TH |
833 | |
834 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
835 | if (err) | |
f6d47a17 | 836 | goto err; |
95668a69 | 837 | |
f6d47a17 | 838 | fuse_copy_finish(cs); |
95668a69 | 839 | return fuse_notify_poll_wakeup(fc, &outarg); |
f6d47a17 MS |
840 | |
841 | err: | |
842 | fuse_copy_finish(cs); | |
843 | return err; | |
95668a69 TH |
844 | } |
845 | ||
8599396b TH |
846 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
847 | unsigned int size, struct fuse_copy_state *cs) | |
848 | { | |
849 | switch (code) { | |
95668a69 TH |
850 | case FUSE_NOTIFY_POLL: |
851 | return fuse_notify_poll(fc, size, cs); | |
852 | ||
8599396b | 853 | default: |
f6d47a17 | 854 | fuse_copy_finish(cs); |
8599396b TH |
855 | return -EINVAL; |
856 | } | |
857 | } | |
858 | ||
334f485d MS |
859 | /* Look up request on processing list by unique ID */ |
860 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) | |
861 | { | |
862 | struct list_head *entry; | |
863 | ||
864 | list_for_each(entry, &fc->processing) { | |
865 | struct fuse_req *req; | |
866 | req = list_entry(entry, struct fuse_req, list); | |
a4d27e75 | 867 | if (req->in.h.unique == unique || req->intr_unique == unique) |
334f485d MS |
868 | return req; |
869 | } | |
870 | return NULL; | |
871 | } | |
872 | ||
873 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, | |
874 | unsigned nbytes) | |
875 | { | |
876 | unsigned reqsize = sizeof(struct fuse_out_header); | |
877 | ||
878 | if (out->h.error) | |
879 | return nbytes != reqsize ? -EINVAL : 0; | |
880 | ||
881 | reqsize += len_args(out->numargs, out->args); | |
882 | ||
883 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) | |
884 | return -EINVAL; | |
885 | else if (reqsize > nbytes) { | |
886 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; | |
887 | unsigned diffsize = reqsize - nbytes; | |
888 | if (diffsize > lastarg->size) | |
889 | return -EINVAL; | |
890 | lastarg->size -= diffsize; | |
891 | } | |
892 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, | |
893 | out->page_zeroing); | |
894 | } | |
895 | ||
896 | /* | |
897 | * Write a single reply to a request. First the header is copied from | |
898 | * the write buffer. The request is then searched on the processing | |
899 | * list by the unique ID found in the header. If found, then remove | |
900 | * it from the list and copy the rest of the buffer to the request. | |
901 | * The request is finished by calling request_end() | |
902 | */ | |
ee0b3e67 BP |
903 | static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, |
904 | unsigned long nr_segs, loff_t pos) | |
334f485d MS |
905 | { |
906 | int err; | |
907 | unsigned nbytes = iov_length(iov, nr_segs); | |
908 | struct fuse_req *req; | |
909 | struct fuse_out_header oh; | |
910 | struct fuse_copy_state cs; | |
ee0b3e67 | 911 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); |
334f485d | 912 | if (!fc) |
a87046d8 | 913 | return -EPERM; |
334f485d | 914 | |
d7133114 | 915 | fuse_copy_init(&cs, fc, 0, NULL, iov, nr_segs); |
334f485d MS |
916 | if (nbytes < sizeof(struct fuse_out_header)) |
917 | return -EINVAL; | |
918 | ||
919 | err = fuse_copy_one(&cs, &oh, sizeof(oh)); | |
920 | if (err) | |
921 | goto err_finish; | |
8599396b TH |
922 | |
923 | err = -EINVAL; | |
924 | if (oh.len != nbytes) | |
925 | goto err_finish; | |
926 | ||
927 | /* | |
928 | * Zero oh.unique indicates unsolicited notification message | |
929 | * and error contains notification code. | |
930 | */ | |
931 | if (!oh.unique) { | |
932 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), &cs); | |
8599396b TH |
933 | return err ? err : nbytes; |
934 | } | |
935 | ||
334f485d | 936 | err = -EINVAL; |
8599396b | 937 | if (oh.error <= -1000 || oh.error > 0) |
334f485d MS |
938 | goto err_finish; |
939 | ||
d7133114 | 940 | spin_lock(&fc->lock); |
69a53bf2 MS |
941 | err = -ENOENT; |
942 | if (!fc->connected) | |
943 | goto err_unlock; | |
944 | ||
334f485d | 945 | req = request_find(fc, oh.unique); |
334f485d MS |
946 | if (!req) |
947 | goto err_unlock; | |
948 | ||
f9a2842e | 949 | if (req->aborted) { |
d7133114 | 950 | spin_unlock(&fc->lock); |
334f485d | 951 | fuse_copy_finish(&cs); |
d7133114 | 952 | spin_lock(&fc->lock); |
222f1d69 | 953 | request_end(fc, req); |
334f485d MS |
954 | return -ENOENT; |
955 | } | |
a4d27e75 MS |
956 | /* Is it an interrupt reply? */ |
957 | if (req->intr_unique == oh.unique) { | |
958 | err = -EINVAL; | |
959 | if (nbytes != sizeof(struct fuse_out_header)) | |
960 | goto err_unlock; | |
961 | ||
962 | if (oh.error == -ENOSYS) | |
963 | fc->no_interrupt = 1; | |
964 | else if (oh.error == -EAGAIN) | |
965 | queue_interrupt(fc, req); | |
966 | ||
967 | spin_unlock(&fc->lock); | |
968 | fuse_copy_finish(&cs); | |
969 | return nbytes; | |
970 | } | |
971 | ||
972 | req->state = FUSE_REQ_WRITING; | |
d77a1d5b | 973 | list_move(&req->list, &fc->io); |
334f485d MS |
974 | req->out.h = oh; |
975 | req->locked = 1; | |
976 | cs.req = req; | |
d7133114 | 977 | spin_unlock(&fc->lock); |
334f485d MS |
978 | |
979 | err = copy_out_args(&cs, &req->out, nbytes); | |
980 | fuse_copy_finish(&cs); | |
981 | ||
d7133114 | 982 | spin_lock(&fc->lock); |
334f485d MS |
983 | req->locked = 0; |
984 | if (!err) { | |
f9a2842e | 985 | if (req->aborted) |
334f485d | 986 | err = -ENOENT; |
f9a2842e | 987 | } else if (!req->aborted) |
334f485d MS |
988 | req->out.h.error = -EIO; |
989 | request_end(fc, req); | |
990 | ||
991 | return err ? err : nbytes; | |
992 | ||
993 | err_unlock: | |
d7133114 | 994 | spin_unlock(&fc->lock); |
334f485d MS |
995 | err_finish: |
996 | fuse_copy_finish(&cs); | |
997 | return err; | |
998 | } | |
999 | ||
334f485d MS |
1000 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
1001 | { | |
334f485d | 1002 | unsigned mask = POLLOUT | POLLWRNORM; |
7025d9ad | 1003 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 1004 | if (!fc) |
7025d9ad | 1005 | return POLLERR; |
334f485d MS |
1006 | |
1007 | poll_wait(file, &fc->waitq, wait); | |
1008 | ||
d7133114 | 1009 | spin_lock(&fc->lock); |
7025d9ad MS |
1010 | if (!fc->connected) |
1011 | mask = POLLERR; | |
a4d27e75 | 1012 | else if (request_pending(fc)) |
7025d9ad | 1013 | mask |= POLLIN | POLLRDNORM; |
d7133114 | 1014 | spin_unlock(&fc->lock); |
334f485d MS |
1015 | |
1016 | return mask; | |
1017 | } | |
1018 | ||
69a53bf2 MS |
1019 | /* |
1020 | * Abort all requests on the given list (pending or processing) | |
1021 | * | |
d7133114 | 1022 | * This function releases and reacquires fc->lock |
69a53bf2 | 1023 | */ |
334f485d | 1024 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
5d9ec854 HH |
1025 | __releases(&fc->lock) |
1026 | __acquires(&fc->lock) | |
334f485d MS |
1027 | { |
1028 | while (!list_empty(head)) { | |
1029 | struct fuse_req *req; | |
1030 | req = list_entry(head->next, struct fuse_req, list); | |
334f485d MS |
1031 | req->out.h.error = -ECONNABORTED; |
1032 | request_end(fc, req); | |
d7133114 | 1033 | spin_lock(&fc->lock); |
334f485d MS |
1034 | } |
1035 | } | |
1036 | ||
69a53bf2 MS |
1037 | /* |
1038 | * Abort requests under I/O | |
1039 | * | |
f9a2842e | 1040 | * The requests are set to aborted and finished, and the request |
69a53bf2 MS |
1041 | * waiter is woken up. This will make request_wait_answer() wait |
1042 | * until the request is unlocked and then return. | |
64c6d8ed MS |
1043 | * |
1044 | * If the request is asynchronous, then the end function needs to be | |
1045 | * called after waiting for the request to be unlocked (if it was | |
1046 | * locked). | |
69a53bf2 MS |
1047 | */ |
1048 | static void end_io_requests(struct fuse_conn *fc) | |
5d9ec854 HH |
1049 | __releases(&fc->lock) |
1050 | __acquires(&fc->lock) | |
69a53bf2 MS |
1051 | { |
1052 | while (!list_empty(&fc->io)) { | |
64c6d8ed MS |
1053 | struct fuse_req *req = |
1054 | list_entry(fc->io.next, struct fuse_req, list); | |
1055 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; | |
1056 | ||
f9a2842e | 1057 | req->aborted = 1; |
69a53bf2 MS |
1058 | req->out.h.error = -ECONNABORTED; |
1059 | req->state = FUSE_REQ_FINISHED; | |
1060 | list_del_init(&req->list); | |
1061 | wake_up(&req->waitq); | |
64c6d8ed MS |
1062 | if (end) { |
1063 | req->end = NULL; | |
64c6d8ed | 1064 | __fuse_get_request(req); |
d7133114 | 1065 | spin_unlock(&fc->lock); |
64c6d8ed MS |
1066 | wait_event(req->waitq, !req->locked); |
1067 | end(fc, req); | |
e9bb09dd | 1068 | fuse_put_request(fc, req); |
d7133114 | 1069 | spin_lock(&fc->lock); |
64c6d8ed | 1070 | } |
69a53bf2 MS |
1071 | } |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Abort all requests. | |
1076 | * | |
1077 | * Emergency exit in case of a malicious or accidental deadlock, or | |
1078 | * just a hung filesystem. | |
1079 | * | |
1080 | * The same effect is usually achievable through killing the | |
1081 | * filesystem daemon and all users of the filesystem. The exception | |
1082 | * is the combination of an asynchronous request and the tricky | |
1083 | * deadlock (see Documentation/filesystems/fuse.txt). | |
1084 | * | |
1085 | * During the aborting, progression of requests from the pending and | |
1086 | * processing lists onto the io list, and progression of new requests | |
1087 | * onto the pending list is prevented by req->connected being false. | |
1088 | * | |
1089 | * Progression of requests under I/O to the processing list is | |
f9a2842e MS |
1090 | * prevented by the req->aborted flag being true for these requests. |
1091 | * For this reason requests on the io list must be aborted first. | |
69a53bf2 MS |
1092 | */ |
1093 | void fuse_abort_conn(struct fuse_conn *fc) | |
1094 | { | |
d7133114 | 1095 | spin_lock(&fc->lock); |
69a53bf2 MS |
1096 | if (fc->connected) { |
1097 | fc->connected = 0; | |
51eb01e7 | 1098 | fc->blocked = 0; |
69a53bf2 MS |
1099 | end_io_requests(fc); |
1100 | end_requests(fc, &fc->pending); | |
1101 | end_requests(fc, &fc->processing); | |
1102 | wake_up_all(&fc->waitq); | |
51eb01e7 | 1103 | wake_up_all(&fc->blocked_waitq); |
385a17bf | 1104 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
69a53bf2 | 1105 | } |
d7133114 | 1106 | spin_unlock(&fc->lock); |
69a53bf2 MS |
1107 | } |
1108 | ||
334f485d MS |
1109 | static int fuse_dev_release(struct inode *inode, struct file *file) |
1110 | { | |
0720b315 | 1111 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 1112 | if (fc) { |
d7133114 | 1113 | spin_lock(&fc->lock); |
1e9a4ed9 | 1114 | fc->connected = 0; |
334f485d MS |
1115 | end_requests(fc, &fc->pending); |
1116 | end_requests(fc, &fc->processing); | |
d7133114 | 1117 | spin_unlock(&fc->lock); |
bafa9654 | 1118 | fuse_conn_put(fc); |
385a17bf | 1119 | } |
f543f253 | 1120 | |
334f485d MS |
1121 | return 0; |
1122 | } | |
1123 | ||
385a17bf JD |
1124 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
1125 | { | |
1126 | struct fuse_conn *fc = fuse_get_conn(file); | |
1127 | if (!fc) | |
a87046d8 | 1128 | return -EPERM; |
385a17bf JD |
1129 | |
1130 | /* No locking - fasync_helper does its own locking */ | |
1131 | return fasync_helper(fd, file, on, &fc->fasync); | |
1132 | } | |
1133 | ||
4b6f5d20 | 1134 | const struct file_operations fuse_dev_operations = { |
334f485d MS |
1135 | .owner = THIS_MODULE, |
1136 | .llseek = no_llseek, | |
ee0b3e67 BP |
1137 | .read = do_sync_read, |
1138 | .aio_read = fuse_dev_read, | |
1139 | .write = do_sync_write, | |
1140 | .aio_write = fuse_dev_write, | |
334f485d MS |
1141 | .poll = fuse_dev_poll, |
1142 | .release = fuse_dev_release, | |
385a17bf | 1143 | .fasync = fuse_dev_fasync, |
334f485d MS |
1144 | }; |
1145 | ||
1146 | static struct miscdevice fuse_miscdevice = { | |
1147 | .minor = FUSE_MINOR, | |
1148 | .name = "fuse", | |
1149 | .fops = &fuse_dev_operations, | |
1150 | }; | |
1151 | ||
1152 | int __init fuse_dev_init(void) | |
1153 | { | |
1154 | int err = -ENOMEM; | |
1155 | fuse_req_cachep = kmem_cache_create("fuse_request", | |
1156 | sizeof(struct fuse_req), | |
20c2df83 | 1157 | 0, 0, NULL); |
334f485d MS |
1158 | if (!fuse_req_cachep) |
1159 | goto out; | |
1160 | ||
1161 | err = misc_register(&fuse_miscdevice); | |
1162 | if (err) | |
1163 | goto out_cache_clean; | |
1164 | ||
1165 | return 0; | |
1166 | ||
1167 | out_cache_clean: | |
1168 | kmem_cache_destroy(fuse_req_cachep); | |
1169 | out: | |
1170 | return err; | |
1171 | } | |
1172 | ||
1173 | void fuse_dev_cleanup(void) | |
1174 | { | |
1175 | misc_deregister(&fuse_miscdevice); | |
1176 | kmem_cache_destroy(fuse_req_cachep); | |
1177 | } |