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> | |
dd3bb14f | 19 | #include <linux/pipe_fs_i.h> |
ce534fb0 MS |
20 | #include <linux/swap.h> |
21 | #include <linux/splice.h> | |
334f485d MS |
22 | |
23 | MODULE_ALIAS_MISCDEV(FUSE_MINOR); | |
578454ff | 24 | MODULE_ALIAS("devname:fuse"); |
334f485d | 25 | |
e18b890b | 26 | static struct kmem_cache *fuse_req_cachep; |
334f485d | 27 | |
8bfc016d | 28 | static struct fuse_conn *fuse_get_conn(struct file *file) |
334f485d | 29 | { |
0720b315 MS |
30 | /* |
31 | * Lockless access is OK, because file->private data is set | |
32 | * once during mount and is valid until the file is released. | |
33 | */ | |
34 | return file->private_data; | |
334f485d MS |
35 | } |
36 | ||
4250c066 | 37 | static void fuse_request_init(struct fuse_req *req, struct page **pages, |
b2430d75 | 38 | struct fuse_page_desc *page_descs, |
4250c066 | 39 | unsigned npages) |
334f485d MS |
40 | { |
41 | memset(req, 0, sizeof(*req)); | |
4250c066 | 42 | memset(pages, 0, sizeof(*pages) * npages); |
b2430d75 | 43 | memset(page_descs, 0, sizeof(*page_descs) * npages); |
334f485d | 44 | INIT_LIST_HEAD(&req->list); |
a4d27e75 | 45 | INIT_LIST_HEAD(&req->intr_entry); |
334f485d MS |
46 | init_waitqueue_head(&req->waitq); |
47 | atomic_set(&req->count, 1); | |
4250c066 | 48 | req->pages = pages; |
b2430d75 | 49 | req->page_descs = page_descs; |
4250c066 | 50 | req->max_pages = npages; |
334f485d MS |
51 | } |
52 | ||
4250c066 | 53 | static struct fuse_req *__fuse_request_alloc(unsigned npages, gfp_t flags) |
334f485d | 54 | { |
4250c066 MP |
55 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, flags); |
56 | if (req) { | |
57 | struct page **pages; | |
b2430d75 | 58 | struct fuse_page_desc *page_descs; |
4250c066 | 59 | |
b2430d75 | 60 | if (npages <= FUSE_REQ_INLINE_PAGES) { |
4250c066 | 61 | pages = req->inline_pages; |
b2430d75 MP |
62 | page_descs = req->inline_page_descs; |
63 | } else { | |
4250c066 | 64 | pages = kmalloc(sizeof(struct page *) * npages, flags); |
b2430d75 MP |
65 | page_descs = kmalloc(sizeof(struct fuse_page_desc) * |
66 | npages, flags); | |
67 | } | |
4250c066 | 68 | |
b2430d75 MP |
69 | if (!pages || !page_descs) { |
70 | kfree(pages); | |
71 | kfree(page_descs); | |
4250c066 MP |
72 | kmem_cache_free(fuse_req_cachep, req); |
73 | return NULL; | |
74 | } | |
75 | ||
b2430d75 | 76 | fuse_request_init(req, pages, page_descs, npages); |
4250c066 | 77 | } |
334f485d MS |
78 | return req; |
79 | } | |
4250c066 MP |
80 | |
81 | struct fuse_req *fuse_request_alloc(unsigned npages) | |
82 | { | |
83 | return __fuse_request_alloc(npages, GFP_KERNEL); | |
84 | } | |
08cbf542 | 85 | EXPORT_SYMBOL_GPL(fuse_request_alloc); |
334f485d | 86 | |
4250c066 | 87 | struct fuse_req *fuse_request_alloc_nofs(unsigned npages) |
3be5a52b | 88 | { |
4250c066 | 89 | return __fuse_request_alloc(npages, GFP_NOFS); |
3be5a52b MS |
90 | } |
91 | ||
334f485d MS |
92 | void fuse_request_free(struct fuse_req *req) |
93 | { | |
b2430d75 | 94 | if (req->pages != req->inline_pages) { |
4250c066 | 95 | kfree(req->pages); |
b2430d75 MP |
96 | kfree(req->page_descs); |
97 | } | |
334f485d MS |
98 | kmem_cache_free(fuse_req_cachep, req); |
99 | } | |
100 | ||
8bfc016d | 101 | static void block_sigs(sigset_t *oldset) |
334f485d MS |
102 | { |
103 | sigset_t mask; | |
104 | ||
105 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
106 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
107 | } | |
108 | ||
8bfc016d | 109 | static void restore_sigs(sigset_t *oldset) |
334f485d MS |
110 | { |
111 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
112 | } | |
113 | ||
334f485d MS |
114 | static void __fuse_get_request(struct fuse_req *req) |
115 | { | |
116 | atomic_inc(&req->count); | |
117 | } | |
118 | ||
119 | /* Must be called with > 1 refcount */ | |
120 | static void __fuse_put_request(struct fuse_req *req) | |
121 | { | |
122 | BUG_ON(atomic_read(&req->count) < 2); | |
123 | atomic_dec(&req->count); | |
124 | } | |
125 | ||
33649c91 MS |
126 | static void fuse_req_init_context(struct fuse_req *req) |
127 | { | |
499dcf20 EB |
128 | req->in.h.uid = from_kuid_munged(&init_user_ns, current_fsuid()); |
129 | req->in.h.gid = from_kgid_munged(&init_user_ns, current_fsgid()); | |
33649c91 MS |
130 | req->in.h.pid = current->pid; |
131 | } | |
132 | ||
8b41e671 MP |
133 | static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages, |
134 | bool for_background) | |
334f485d | 135 | { |
08a53cdc MS |
136 | struct fuse_req *req; |
137 | sigset_t oldset; | |
9bc5ddda | 138 | int intr; |
08a53cdc MS |
139 | int err; |
140 | ||
9bc5ddda | 141 | atomic_inc(&fc->num_waiting); |
08a53cdc | 142 | block_sigs(&oldset); |
9bc5ddda | 143 | intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked); |
08a53cdc | 144 | restore_sigs(&oldset); |
9bc5ddda MS |
145 | err = -EINTR; |
146 | if (intr) | |
147 | goto out; | |
08a53cdc | 148 | |
51eb01e7 MS |
149 | err = -ENOTCONN; |
150 | if (!fc->connected) | |
151 | goto out; | |
152 | ||
b111c8c0 | 153 | req = fuse_request_alloc(npages); |
9bc5ddda | 154 | err = -ENOMEM; |
ce1d5a49 | 155 | if (!req) |
9bc5ddda | 156 | goto out; |
334f485d | 157 | |
33649c91 | 158 | fuse_req_init_context(req); |
9bc5ddda | 159 | req->waiting = 1; |
8b41e671 | 160 | req->background = for_background; |
334f485d | 161 | return req; |
9bc5ddda MS |
162 | |
163 | out: | |
164 | atomic_dec(&fc->num_waiting); | |
165 | return ERR_PTR(err); | |
334f485d | 166 | } |
8b41e671 MP |
167 | |
168 | struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages) | |
169 | { | |
170 | return __fuse_get_req(fc, npages, false); | |
171 | } | |
08cbf542 | 172 | EXPORT_SYMBOL_GPL(fuse_get_req); |
334f485d | 173 | |
8b41e671 MP |
174 | struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, |
175 | unsigned npages) | |
176 | { | |
177 | return __fuse_get_req(fc, npages, true); | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(fuse_get_req_for_background); | |
180 | ||
33649c91 MS |
181 | /* |
182 | * Return request in fuse_file->reserved_req. However that may | |
183 | * currently be in use. If that is the case, wait for it to become | |
184 | * available. | |
185 | */ | |
186 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, | |
187 | struct file *file) | |
188 | { | |
189 | struct fuse_req *req = NULL; | |
190 | struct fuse_file *ff = file->private_data; | |
191 | ||
192 | do { | |
de5e3dec | 193 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
33649c91 MS |
194 | spin_lock(&fc->lock); |
195 | if (ff->reserved_req) { | |
196 | req = ff->reserved_req; | |
197 | ff->reserved_req = NULL; | |
cb0942b8 | 198 | req->stolen_file = get_file(file); |
33649c91 MS |
199 | } |
200 | spin_unlock(&fc->lock); | |
201 | } while (!req); | |
202 | ||
203 | return req; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Put stolen request back into fuse_file->reserved_req | |
208 | */ | |
209 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) | |
210 | { | |
211 | struct file *file = req->stolen_file; | |
212 | struct fuse_file *ff = file->private_data; | |
213 | ||
214 | spin_lock(&fc->lock); | |
b2430d75 | 215 | fuse_request_init(req, req->pages, req->page_descs, req->max_pages); |
33649c91 MS |
216 | BUG_ON(ff->reserved_req); |
217 | ff->reserved_req = req; | |
de5e3dec | 218 | wake_up_all(&fc->reserved_req_waitq); |
33649c91 MS |
219 | spin_unlock(&fc->lock); |
220 | fput(file); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Gets a requests for a file operation, always succeeds | |
225 | * | |
226 | * This is used for sending the FLUSH request, which must get to | |
227 | * userspace, due to POSIX locks which may need to be unlocked. | |
228 | * | |
229 | * If allocation fails due to OOM, use the reserved request in | |
230 | * fuse_file. | |
231 | * | |
232 | * This is very unlikely to deadlock accidentally, since the | |
233 | * filesystem should not have it's own file open. If deadlock is | |
234 | * intentional, it can still be broken by "aborting" the filesystem. | |
235 | */ | |
b111c8c0 MP |
236 | struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, |
237 | struct file *file) | |
33649c91 MS |
238 | { |
239 | struct fuse_req *req; | |
240 | ||
241 | atomic_inc(&fc->num_waiting); | |
242 | wait_event(fc->blocked_waitq, !fc->blocked); | |
b111c8c0 | 243 | req = fuse_request_alloc(0); |
33649c91 MS |
244 | if (!req) |
245 | req = get_reserved_req(fc, file); | |
246 | ||
247 | fuse_req_init_context(req); | |
248 | req->waiting = 1; | |
8b41e671 | 249 | req->background = 0; |
33649c91 MS |
250 | return req; |
251 | } | |
252 | ||
334f485d | 253 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
7128ec2a MS |
254 | { |
255 | if (atomic_dec_and_test(&req->count)) { | |
9bc5ddda MS |
256 | if (req->waiting) |
257 | atomic_dec(&fc->num_waiting); | |
33649c91 MS |
258 | |
259 | if (req->stolen_file) | |
260 | put_reserved_req(fc, req); | |
261 | else | |
262 | fuse_request_free(req); | |
7128ec2a MS |
263 | } |
264 | } | |
08cbf542 | 265 | EXPORT_SYMBOL_GPL(fuse_put_request); |
7128ec2a | 266 | |
d12def1b MS |
267 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
268 | { | |
269 | unsigned nbytes = 0; | |
270 | unsigned i; | |
271 | ||
272 | for (i = 0; i < numargs; i++) | |
273 | nbytes += args[i].size; | |
274 | ||
275 | return nbytes; | |
276 | } | |
277 | ||
278 | static u64 fuse_get_unique(struct fuse_conn *fc) | |
279 | { | |
280 | fc->reqctr++; | |
281 | /* zero is special */ | |
282 | if (fc->reqctr == 0) | |
283 | fc->reqctr = 1; | |
284 | ||
285 | return fc->reqctr; | |
286 | } | |
287 | ||
288 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) | |
289 | { | |
d12def1b MS |
290 | req->in.h.len = sizeof(struct fuse_in_header) + |
291 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); | |
292 | list_add_tail(&req->list, &fc->pending); | |
293 | req->state = FUSE_REQ_PENDING; | |
294 | if (!req->waiting) { | |
295 | req->waiting = 1; | |
296 | atomic_inc(&fc->num_waiting); | |
297 | } | |
298 | wake_up(&fc->waitq); | |
299 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
300 | } | |
301 | ||
07e77dca MS |
302 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
303 | u64 nodeid, u64 nlookup) | |
304 | { | |
02c048b9 MS |
305 | forget->forget_one.nodeid = nodeid; |
306 | forget->forget_one.nlookup = nlookup; | |
07e77dca MS |
307 | |
308 | spin_lock(&fc->lock); | |
5dfcc87f MS |
309 | if (fc->connected) { |
310 | fc->forget_list_tail->next = forget; | |
311 | fc->forget_list_tail = forget; | |
312 | wake_up(&fc->waitq); | |
313 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
314 | } else { | |
315 | kfree(forget); | |
316 | } | |
07e77dca MS |
317 | spin_unlock(&fc->lock); |
318 | } | |
319 | ||
d12def1b MS |
320 | static void flush_bg_queue(struct fuse_conn *fc) |
321 | { | |
7a6d3c8b | 322 | while (fc->active_background < fc->max_background && |
d12def1b MS |
323 | !list_empty(&fc->bg_queue)) { |
324 | struct fuse_req *req; | |
325 | ||
326 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); | |
327 | list_del(&req->list); | |
328 | fc->active_background++; | |
2d45ba38 | 329 | req->in.h.unique = fuse_get_unique(fc); |
d12def1b MS |
330 | queue_request(fc, req); |
331 | } | |
332 | } | |
333 | ||
334f485d MS |
334 | /* |
335 | * This function is called when a request is finished. Either a reply | |
f9a2842e | 336 | * has arrived or it was aborted (and not yet sent) or some error |
f43b155a | 337 | * occurred during communication with userspace, or the device file |
51eb01e7 MS |
338 | * was closed. The requester thread is woken up (if still waiting), |
339 | * the 'end' callback is called if given, else the reference to the | |
340 | * request is released | |
7128ec2a | 341 | * |
d7133114 | 342 | * Called with fc->lock, unlocks it |
334f485d MS |
343 | */ |
344 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 | 345 | __releases(fc->lock) |
334f485d | 346 | { |
51eb01e7 MS |
347 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
348 | req->end = NULL; | |
d77a1d5b | 349 | list_del(&req->list); |
a4d27e75 | 350 | list_del(&req->intr_entry); |
83cfd493 | 351 | req->state = FUSE_REQ_FINISHED; |
51eb01e7 | 352 | if (req->background) { |
7a6d3c8b | 353 | if (fc->num_background == fc->max_background) { |
51eb01e7 MS |
354 | fc->blocked = 0; |
355 | wake_up_all(&fc->blocked_waitq); | |
356 | } | |
7a6d3c8b | 357 | if (fc->num_background == fc->congestion_threshold && |
a325f9b9 | 358 | fc->connected && fc->bdi_initialized) { |
8aa7e847 JA |
359 | clear_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
360 | clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC); | |
f92b99b9 | 361 | } |
51eb01e7 | 362 | fc->num_background--; |
d12def1b MS |
363 | fc->active_background--; |
364 | flush_bg_queue(fc); | |
334f485d | 365 | } |
51eb01e7 | 366 | spin_unlock(&fc->lock); |
51eb01e7 MS |
367 | wake_up(&req->waitq); |
368 | if (end) | |
369 | end(fc, req); | |
e9bb09dd | 370 | fuse_put_request(fc, req); |
334f485d MS |
371 | } |
372 | ||
a4d27e75 MS |
373 | static void wait_answer_interruptible(struct fuse_conn *fc, |
374 | struct fuse_req *req) | |
b9ca67b2 MS |
375 | __releases(fc->lock) |
376 | __acquires(fc->lock) | |
a4d27e75 MS |
377 | { |
378 | if (signal_pending(current)) | |
379 | return; | |
380 | ||
381 | spin_unlock(&fc->lock); | |
382 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); | |
383 | spin_lock(&fc->lock); | |
384 | } | |
385 | ||
386 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) | |
387 | { | |
388 | list_add_tail(&req->intr_entry, &fc->interrupts); | |
389 | wake_up(&fc->waitq); | |
390 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
391 | } | |
392 | ||
7c352bdf | 393 | static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) |
b9ca67b2 MS |
394 | __releases(fc->lock) |
395 | __acquires(fc->lock) | |
334f485d | 396 | { |
a4d27e75 MS |
397 | if (!fc->no_interrupt) { |
398 | /* Any signal may interrupt this */ | |
399 | wait_answer_interruptible(fc, req); | |
334f485d | 400 | |
a4d27e75 MS |
401 | if (req->aborted) |
402 | goto aborted; | |
403 | if (req->state == FUSE_REQ_FINISHED) | |
404 | return; | |
405 | ||
406 | req->interrupted = 1; | |
407 | if (req->state == FUSE_REQ_SENT) | |
408 | queue_interrupt(fc, req); | |
409 | } | |
410 | ||
a131de0a | 411 | if (!req->force) { |
a4d27e75 MS |
412 | sigset_t oldset; |
413 | ||
414 | /* Only fatal signals may interrupt this */ | |
51eb01e7 | 415 | block_sigs(&oldset); |
a4d27e75 | 416 | wait_answer_interruptible(fc, req); |
51eb01e7 | 417 | restore_sigs(&oldset); |
a131de0a MS |
418 | |
419 | if (req->aborted) | |
420 | goto aborted; | |
421 | if (req->state == FUSE_REQ_FINISHED) | |
422 | return; | |
423 | ||
424 | /* Request is not yet in userspace, bail out */ | |
425 | if (req->state == FUSE_REQ_PENDING) { | |
426 | list_del(&req->list); | |
427 | __fuse_put_request(req); | |
428 | req->out.h.error = -EINTR; | |
429 | return; | |
430 | } | |
51eb01e7 | 431 | } |
334f485d | 432 | |
a131de0a MS |
433 | /* |
434 | * Either request is already in userspace, or it was forced. | |
435 | * Wait it out. | |
436 | */ | |
437 | spin_unlock(&fc->lock); | |
438 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); | |
439 | spin_lock(&fc->lock); | |
a4d27e75 | 440 | |
a131de0a MS |
441 | if (!req->aborted) |
442 | return; | |
a4d27e75 MS |
443 | |
444 | aborted: | |
a131de0a | 445 | BUG_ON(req->state != FUSE_REQ_FINISHED); |
334f485d MS |
446 | if (req->locked) { |
447 | /* This is uninterruptible sleep, because data is | |
448 | being copied to/from the buffers of req. During | |
449 | locked state, there mustn't be any filesystem | |
450 | operation (e.g. page fault), since that could lead | |
451 | to deadlock */ | |
d7133114 | 452 | spin_unlock(&fc->lock); |
334f485d | 453 | wait_event(req->waitq, !req->locked); |
d7133114 | 454 | spin_lock(&fc->lock); |
334f485d | 455 | } |
334f485d MS |
456 | } |
457 | ||
6a4e922c | 458 | static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 459 | { |
8b41e671 | 460 | BUG_ON(req->background); |
d7133114 | 461 | spin_lock(&fc->lock); |
1e9a4ed9 | 462 | if (!fc->connected) |
334f485d MS |
463 | req->out.h.error = -ENOTCONN; |
464 | else if (fc->conn_error) | |
465 | req->out.h.error = -ECONNREFUSED; | |
466 | else { | |
2d45ba38 | 467 | req->in.h.unique = fuse_get_unique(fc); |
334f485d MS |
468 | queue_request(fc, req); |
469 | /* acquire extra reference, since request is still needed | |
470 | after request_end() */ | |
471 | __fuse_get_request(req); | |
472 | ||
7c352bdf | 473 | request_wait_answer(fc, req); |
334f485d | 474 | } |
d7133114 | 475 | spin_unlock(&fc->lock); |
334f485d | 476 | } |
6a4e922c EW |
477 | |
478 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) | |
479 | { | |
480 | req->isreply = 1; | |
481 | __fuse_request_send(fc, req); | |
482 | } | |
08cbf542 | 483 | EXPORT_SYMBOL_GPL(fuse_request_send); |
334f485d | 484 | |
b93f858a TH |
485 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
486 | struct fuse_req *req) | |
d12def1b | 487 | { |
8b41e671 | 488 | BUG_ON(!req->background); |
d12def1b | 489 | fc->num_background++; |
7a6d3c8b | 490 | if (fc->num_background == fc->max_background) |
d12def1b | 491 | fc->blocked = 1; |
7a6d3c8b | 492 | if (fc->num_background == fc->congestion_threshold && |
a325f9b9 | 493 | fc->bdi_initialized) { |
8aa7e847 JA |
494 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
495 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); | |
d12def1b MS |
496 | } |
497 | list_add_tail(&req->list, &fc->bg_queue); | |
498 | flush_bg_queue(fc); | |
499 | } | |
500 | ||
b93f858a | 501 | static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 502 | { |
d7133114 | 503 | spin_lock(&fc->lock); |
1e9a4ed9 | 504 | if (fc->connected) { |
b93f858a | 505 | fuse_request_send_nowait_locked(fc, req); |
d7133114 | 506 | spin_unlock(&fc->lock); |
334f485d MS |
507 | } else { |
508 | req->out.h.error = -ENOTCONN; | |
509 | request_end(fc, req); | |
510 | } | |
511 | } | |
512 | ||
b93f858a | 513 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
514 | { |
515 | req->isreply = 1; | |
b93f858a | 516 | fuse_request_send_nowait(fc, req); |
334f485d | 517 | } |
08cbf542 | 518 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
334f485d | 519 | |
2d45ba38 MS |
520 | static int fuse_request_send_notify_reply(struct fuse_conn *fc, |
521 | struct fuse_req *req, u64 unique) | |
522 | { | |
523 | int err = -ENODEV; | |
524 | ||
525 | req->isreply = 0; | |
526 | req->in.h.unique = unique; | |
527 | spin_lock(&fc->lock); | |
528 | if (fc->connected) { | |
529 | queue_request(fc, req); | |
530 | err = 0; | |
531 | } | |
532 | spin_unlock(&fc->lock); | |
533 | ||
534 | return err; | |
535 | } | |
536 | ||
3be5a52b MS |
537 | /* |
538 | * Called under fc->lock | |
539 | * | |
540 | * fc->connected must have been checked previously | |
541 | */ | |
b93f858a TH |
542 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
543 | struct fuse_req *req) | |
3be5a52b MS |
544 | { |
545 | req->isreply = 1; | |
b93f858a | 546 | fuse_request_send_nowait_locked(fc, req); |
3be5a52b MS |
547 | } |
548 | ||
0b05b183 AA |
549 | void fuse_force_forget(struct file *file, u64 nodeid) |
550 | { | |
6131ffaa | 551 | struct inode *inode = file_inode(file); |
0b05b183 AA |
552 | struct fuse_conn *fc = get_fuse_conn(inode); |
553 | struct fuse_req *req; | |
554 | struct fuse_forget_in inarg; | |
555 | ||
556 | memset(&inarg, 0, sizeof(inarg)); | |
557 | inarg.nlookup = 1; | |
b111c8c0 | 558 | req = fuse_get_req_nofail_nopages(fc, file); |
0b05b183 AA |
559 | req->in.h.opcode = FUSE_FORGET; |
560 | req->in.h.nodeid = nodeid; | |
561 | req->in.numargs = 1; | |
562 | req->in.args[0].size = sizeof(inarg); | |
563 | req->in.args[0].value = &inarg; | |
564 | req->isreply = 0; | |
6a4e922c EW |
565 | __fuse_request_send(fc, req); |
566 | /* ignore errors */ | |
567 | fuse_put_request(fc, req); | |
0b05b183 AA |
568 | } |
569 | ||
334f485d MS |
570 | /* |
571 | * Lock the request. Up to the next unlock_request() there mustn't be | |
572 | * anything that could cause a page-fault. If the request was already | |
f9a2842e | 573 | * aborted bail out. |
334f485d | 574 | */ |
d7133114 | 575 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
576 | { |
577 | int err = 0; | |
578 | if (req) { | |
d7133114 | 579 | spin_lock(&fc->lock); |
f9a2842e | 580 | if (req->aborted) |
334f485d MS |
581 | err = -ENOENT; |
582 | else | |
583 | req->locked = 1; | |
d7133114 | 584 | spin_unlock(&fc->lock); |
334f485d MS |
585 | } |
586 | return err; | |
587 | } | |
588 | ||
589 | /* | |
f9a2842e | 590 | * Unlock request. If it was aborted during being locked, the |
334f485d MS |
591 | * requester thread is currently waiting for it to be unlocked, so |
592 | * wake it up. | |
593 | */ | |
d7133114 | 594 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
595 | { |
596 | if (req) { | |
d7133114 | 597 | spin_lock(&fc->lock); |
334f485d | 598 | req->locked = 0; |
f9a2842e | 599 | if (req->aborted) |
334f485d | 600 | wake_up(&req->waitq); |
d7133114 | 601 | spin_unlock(&fc->lock); |
334f485d MS |
602 | } |
603 | } | |
604 | ||
605 | struct fuse_copy_state { | |
d7133114 | 606 | struct fuse_conn *fc; |
334f485d MS |
607 | int write; |
608 | struct fuse_req *req; | |
609 | const struct iovec *iov; | |
dd3bb14f MS |
610 | struct pipe_buffer *pipebufs; |
611 | struct pipe_buffer *currbuf; | |
612 | struct pipe_inode_info *pipe; | |
334f485d MS |
613 | unsigned long nr_segs; |
614 | unsigned long seglen; | |
615 | unsigned long addr; | |
616 | struct page *pg; | |
617 | void *mapaddr; | |
618 | void *buf; | |
619 | unsigned len; | |
ce534fb0 | 620 | unsigned move_pages:1; |
334f485d MS |
621 | }; |
622 | ||
d7133114 | 623 | static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc, |
c3021629 | 624 | int write, |
d7133114 | 625 | const struct iovec *iov, unsigned long nr_segs) |
334f485d MS |
626 | { |
627 | memset(cs, 0, sizeof(*cs)); | |
d7133114 | 628 | cs->fc = fc; |
334f485d | 629 | cs->write = write; |
334f485d MS |
630 | cs->iov = iov; |
631 | cs->nr_segs = nr_segs; | |
632 | } | |
633 | ||
634 | /* Unmap and put previous page of userspace buffer */ | |
8bfc016d | 635 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
334f485d | 636 | { |
dd3bb14f MS |
637 | if (cs->currbuf) { |
638 | struct pipe_buffer *buf = cs->currbuf; | |
639 | ||
c3021629 MS |
640 | if (!cs->write) { |
641 | buf->ops->unmap(cs->pipe, buf, cs->mapaddr); | |
642 | } else { | |
7909b1c6 | 643 | kunmap(buf->page); |
c3021629 MS |
644 | buf->len = PAGE_SIZE - cs->len; |
645 | } | |
dd3bb14f MS |
646 | cs->currbuf = NULL; |
647 | cs->mapaddr = NULL; | |
648 | } else if (cs->mapaddr) { | |
7909b1c6 | 649 | kunmap(cs->pg); |
334f485d MS |
650 | if (cs->write) { |
651 | flush_dcache_page(cs->pg); | |
652 | set_page_dirty_lock(cs->pg); | |
653 | } | |
654 | put_page(cs->pg); | |
655 | cs->mapaddr = NULL; | |
656 | } | |
657 | } | |
658 | ||
659 | /* | |
660 | * Get another pagefull of userspace buffer, and map it to kernel | |
661 | * address space, and lock request | |
662 | */ | |
663 | static int fuse_copy_fill(struct fuse_copy_state *cs) | |
664 | { | |
665 | unsigned long offset; | |
666 | int err; | |
667 | ||
d7133114 | 668 | unlock_request(cs->fc, cs->req); |
334f485d | 669 | fuse_copy_finish(cs); |
dd3bb14f MS |
670 | if (cs->pipebufs) { |
671 | struct pipe_buffer *buf = cs->pipebufs; | |
672 | ||
c3021629 MS |
673 | if (!cs->write) { |
674 | err = buf->ops->confirm(cs->pipe, buf); | |
675 | if (err) | |
676 | return err; | |
677 | ||
678 | BUG_ON(!cs->nr_segs); | |
679 | cs->currbuf = buf; | |
7909b1c6 | 680 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 0); |
c3021629 MS |
681 | cs->len = buf->len; |
682 | cs->buf = cs->mapaddr + buf->offset; | |
683 | cs->pipebufs++; | |
684 | cs->nr_segs--; | |
685 | } else { | |
686 | struct page *page; | |
dd3bb14f | 687 | |
c3021629 MS |
688 | if (cs->nr_segs == cs->pipe->buffers) |
689 | return -EIO; | |
690 | ||
691 | page = alloc_page(GFP_HIGHUSER); | |
692 | if (!page) | |
693 | return -ENOMEM; | |
694 | ||
695 | buf->page = page; | |
696 | buf->offset = 0; | |
697 | buf->len = 0; | |
698 | ||
699 | cs->currbuf = buf; | |
7909b1c6 | 700 | cs->mapaddr = kmap(page); |
c3021629 MS |
701 | cs->buf = cs->mapaddr; |
702 | cs->len = PAGE_SIZE; | |
703 | cs->pipebufs++; | |
704 | cs->nr_segs++; | |
705 | } | |
dd3bb14f MS |
706 | } else { |
707 | if (!cs->seglen) { | |
708 | BUG_ON(!cs->nr_segs); | |
709 | cs->seglen = cs->iov[0].iov_len; | |
710 | cs->addr = (unsigned long) cs->iov[0].iov_base; | |
711 | cs->iov++; | |
712 | cs->nr_segs--; | |
713 | } | |
714 | err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg); | |
715 | if (err < 0) | |
716 | return err; | |
717 | BUG_ON(err != 1); | |
718 | offset = cs->addr % PAGE_SIZE; | |
7909b1c6 | 719 | cs->mapaddr = kmap(cs->pg); |
dd3bb14f MS |
720 | cs->buf = cs->mapaddr + offset; |
721 | cs->len = min(PAGE_SIZE - offset, cs->seglen); | |
722 | cs->seglen -= cs->len; | |
723 | cs->addr += cs->len; | |
334f485d | 724 | } |
334f485d | 725 | |
d7133114 | 726 | return lock_request(cs->fc, cs->req); |
334f485d MS |
727 | } |
728 | ||
729 | /* Do as much copy to/from userspace buffer as we can */ | |
8bfc016d | 730 | static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size) |
334f485d MS |
731 | { |
732 | unsigned ncpy = min(*size, cs->len); | |
733 | if (val) { | |
734 | if (cs->write) | |
735 | memcpy(cs->buf, *val, ncpy); | |
736 | else | |
737 | memcpy(*val, cs->buf, ncpy); | |
738 | *val += ncpy; | |
739 | } | |
740 | *size -= ncpy; | |
741 | cs->len -= ncpy; | |
742 | cs->buf += ncpy; | |
743 | return ncpy; | |
744 | } | |
745 | ||
ce534fb0 MS |
746 | static int fuse_check_page(struct page *page) |
747 | { | |
748 | if (page_mapcount(page) || | |
749 | page->mapping != NULL || | |
750 | page_count(page) != 1 || | |
751 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & | |
752 | ~(1 << PG_locked | | |
753 | 1 << PG_referenced | | |
754 | 1 << PG_uptodate | | |
755 | 1 << PG_lru | | |
756 | 1 << PG_active | | |
757 | 1 << PG_reclaim))) { | |
758 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); | |
759 | printk(KERN_WARNING " page=%p index=%li flags=%08lx, count=%i, mapcount=%i, mapping=%p\n", page, page->index, page->flags, page_count(page), page_mapcount(page), page->mapping); | |
760 | return 1; | |
761 | } | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) | |
766 | { | |
767 | int err; | |
768 | struct page *oldpage = *pagep; | |
769 | struct page *newpage; | |
770 | struct pipe_buffer *buf = cs->pipebufs; | |
ce534fb0 MS |
771 | |
772 | unlock_request(cs->fc, cs->req); | |
773 | fuse_copy_finish(cs); | |
774 | ||
775 | err = buf->ops->confirm(cs->pipe, buf); | |
776 | if (err) | |
777 | return err; | |
778 | ||
779 | BUG_ON(!cs->nr_segs); | |
780 | cs->currbuf = buf; | |
781 | cs->len = buf->len; | |
782 | cs->pipebufs++; | |
783 | cs->nr_segs--; | |
784 | ||
785 | if (cs->len != PAGE_SIZE) | |
786 | goto out_fallback; | |
787 | ||
788 | if (buf->ops->steal(cs->pipe, buf) != 0) | |
789 | goto out_fallback; | |
790 | ||
791 | newpage = buf->page; | |
792 | ||
793 | if (WARN_ON(!PageUptodate(newpage))) | |
794 | return -EIO; | |
795 | ||
796 | ClearPageMappedToDisk(newpage); | |
797 | ||
798 | if (fuse_check_page(newpage) != 0) | |
799 | goto out_fallback_unlock; | |
800 | ||
ce534fb0 MS |
801 | /* |
802 | * This is a new and locked page, it shouldn't be mapped or | |
803 | * have any special flags on it | |
804 | */ | |
805 | if (WARN_ON(page_mapped(oldpage))) | |
806 | goto out_fallback_unlock; | |
807 | if (WARN_ON(page_has_private(oldpage))) | |
808 | goto out_fallback_unlock; | |
809 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) | |
810 | goto out_fallback_unlock; | |
811 | if (WARN_ON(PageMlocked(oldpage))) | |
812 | goto out_fallback_unlock; | |
813 | ||
ef6a3c63 | 814 | err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL); |
ce534fb0 | 815 | if (err) { |
ef6a3c63 MS |
816 | unlock_page(newpage); |
817 | return err; | |
ce534fb0 | 818 | } |
ef6a3c63 | 819 | |
ce534fb0 MS |
820 | page_cache_get(newpage); |
821 | ||
822 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) | |
823 | lru_cache_add_file(newpage); | |
824 | ||
825 | err = 0; | |
826 | spin_lock(&cs->fc->lock); | |
827 | if (cs->req->aborted) | |
828 | err = -ENOENT; | |
829 | else | |
830 | *pagep = newpage; | |
831 | spin_unlock(&cs->fc->lock); | |
832 | ||
833 | if (err) { | |
834 | unlock_page(newpage); | |
835 | page_cache_release(newpage); | |
836 | return err; | |
837 | } | |
838 | ||
839 | unlock_page(oldpage); | |
840 | page_cache_release(oldpage); | |
841 | cs->len = 0; | |
842 | ||
843 | return 0; | |
844 | ||
845 | out_fallback_unlock: | |
846 | unlock_page(newpage); | |
847 | out_fallback: | |
848 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); | |
849 | cs->buf = cs->mapaddr + buf->offset; | |
850 | ||
851 | err = lock_request(cs->fc, cs->req); | |
852 | if (err) | |
853 | return err; | |
854 | ||
855 | return 1; | |
856 | } | |
857 | ||
c3021629 MS |
858 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
859 | unsigned offset, unsigned count) | |
860 | { | |
861 | struct pipe_buffer *buf; | |
862 | ||
863 | if (cs->nr_segs == cs->pipe->buffers) | |
864 | return -EIO; | |
865 | ||
866 | unlock_request(cs->fc, cs->req); | |
867 | fuse_copy_finish(cs); | |
868 | ||
869 | buf = cs->pipebufs; | |
870 | page_cache_get(page); | |
871 | buf->page = page; | |
872 | buf->offset = offset; | |
873 | buf->len = count; | |
874 | ||
875 | cs->pipebufs++; | |
876 | cs->nr_segs++; | |
877 | cs->len = 0; | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
334f485d MS |
882 | /* |
883 | * Copy a page in the request to/from the userspace buffer. Must be | |
884 | * done atomically | |
885 | */ | |
ce534fb0 | 886 | static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep, |
8bfc016d | 887 | unsigned offset, unsigned count, int zeroing) |
334f485d | 888 | { |
ce534fb0 MS |
889 | int err; |
890 | struct page *page = *pagep; | |
891 | ||
b6777c40 MS |
892 | if (page && zeroing && count < PAGE_SIZE) |
893 | clear_highpage(page); | |
894 | ||
334f485d | 895 | while (count) { |
c3021629 MS |
896 | if (cs->write && cs->pipebufs && page) { |
897 | return fuse_ref_page(cs, page, offset, count); | |
898 | } else if (!cs->len) { | |
ce534fb0 MS |
899 | if (cs->move_pages && page && |
900 | offset == 0 && count == PAGE_SIZE) { | |
901 | err = fuse_try_move_page(cs, pagep); | |
902 | if (err <= 0) | |
903 | return err; | |
904 | } else { | |
905 | err = fuse_copy_fill(cs); | |
906 | if (err) | |
907 | return err; | |
908 | } | |
1729a16c | 909 | } |
334f485d | 910 | if (page) { |
2408f6ef | 911 | void *mapaddr = kmap_atomic(page); |
334f485d MS |
912 | void *buf = mapaddr + offset; |
913 | offset += fuse_copy_do(cs, &buf, &count); | |
2408f6ef | 914 | kunmap_atomic(mapaddr); |
334f485d MS |
915 | } else |
916 | offset += fuse_copy_do(cs, NULL, &count); | |
917 | } | |
918 | if (page && !cs->write) | |
919 | flush_dcache_page(page); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | /* Copy pages in the request to/from userspace buffer */ | |
924 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, | |
925 | int zeroing) | |
926 | { | |
927 | unsigned i; | |
928 | struct fuse_req *req = cs->req; | |
334f485d MS |
929 | |
930 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { | |
ce534fb0 | 931 | int err; |
85f40aec MP |
932 | unsigned offset = req->page_descs[i].offset; |
933 | unsigned count = min(nbytes, req->page_descs[i].length); | |
ce534fb0 MS |
934 | |
935 | err = fuse_copy_page(cs, &req->pages[i], offset, count, | |
936 | zeroing); | |
334f485d MS |
937 | if (err) |
938 | return err; | |
939 | ||
940 | nbytes -= count; | |
334f485d MS |
941 | } |
942 | return 0; | |
943 | } | |
944 | ||
945 | /* Copy a single argument in the request to/from userspace buffer */ | |
946 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) | |
947 | { | |
948 | while (size) { | |
1729a16c MS |
949 | if (!cs->len) { |
950 | int err = fuse_copy_fill(cs); | |
951 | if (err) | |
952 | return err; | |
953 | } | |
334f485d MS |
954 | fuse_copy_do(cs, &val, &size); |
955 | } | |
956 | return 0; | |
957 | } | |
958 | ||
959 | /* Copy request arguments to/from userspace buffer */ | |
960 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, | |
961 | unsigned argpages, struct fuse_arg *args, | |
962 | int zeroing) | |
963 | { | |
964 | int err = 0; | |
965 | unsigned i; | |
966 | ||
967 | for (i = 0; !err && i < numargs; i++) { | |
968 | struct fuse_arg *arg = &args[i]; | |
969 | if (i == numargs - 1 && argpages) | |
970 | err = fuse_copy_pages(cs, arg->size, zeroing); | |
971 | else | |
972 | err = fuse_copy_one(cs, arg->value, arg->size); | |
973 | } | |
974 | return err; | |
975 | } | |
976 | ||
07e77dca MS |
977 | static int forget_pending(struct fuse_conn *fc) |
978 | { | |
979 | return fc->forget_list_head.next != NULL; | |
980 | } | |
981 | ||
a4d27e75 MS |
982 | static int request_pending(struct fuse_conn *fc) |
983 | { | |
07e77dca MS |
984 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) || |
985 | forget_pending(fc); | |
a4d27e75 MS |
986 | } |
987 | ||
334f485d MS |
988 | /* Wait until a request is available on the pending list */ |
989 | static void request_wait(struct fuse_conn *fc) | |
b9ca67b2 MS |
990 | __releases(fc->lock) |
991 | __acquires(fc->lock) | |
334f485d MS |
992 | { |
993 | DECLARE_WAITQUEUE(wait, current); | |
994 | ||
995 | add_wait_queue_exclusive(&fc->waitq, &wait); | |
a4d27e75 | 996 | while (fc->connected && !request_pending(fc)) { |
334f485d MS |
997 | set_current_state(TASK_INTERRUPTIBLE); |
998 | if (signal_pending(current)) | |
999 | break; | |
1000 | ||
d7133114 | 1001 | spin_unlock(&fc->lock); |
334f485d | 1002 | schedule(); |
d7133114 | 1003 | spin_lock(&fc->lock); |
334f485d MS |
1004 | } |
1005 | set_current_state(TASK_RUNNING); | |
1006 | remove_wait_queue(&fc->waitq, &wait); | |
1007 | } | |
1008 | ||
a4d27e75 MS |
1009 | /* |
1010 | * Transfer an interrupt request to userspace | |
1011 | * | |
1012 | * Unlike other requests this is assembled on demand, without a need | |
1013 | * to allocate a separate fuse_req structure. | |
1014 | * | |
1015 | * Called with fc->lock held, releases it | |
1016 | */ | |
c3021629 MS |
1017 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs, |
1018 | size_t nbytes, struct fuse_req *req) | |
b9ca67b2 | 1019 | __releases(fc->lock) |
a4d27e75 | 1020 | { |
a4d27e75 MS |
1021 | struct fuse_in_header ih; |
1022 | struct fuse_interrupt_in arg; | |
1023 | unsigned reqsize = sizeof(ih) + sizeof(arg); | |
1024 | int err; | |
1025 | ||
1026 | list_del_init(&req->intr_entry); | |
1027 | req->intr_unique = fuse_get_unique(fc); | |
1028 | memset(&ih, 0, sizeof(ih)); | |
1029 | memset(&arg, 0, sizeof(arg)); | |
1030 | ih.len = reqsize; | |
1031 | ih.opcode = FUSE_INTERRUPT; | |
1032 | ih.unique = req->intr_unique; | |
1033 | arg.unique = req->in.h.unique; | |
1034 | ||
1035 | spin_unlock(&fc->lock); | |
c3021629 | 1036 | if (nbytes < reqsize) |
a4d27e75 MS |
1037 | return -EINVAL; |
1038 | ||
c3021629 | 1039 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
a4d27e75 | 1040 | if (!err) |
c3021629 MS |
1041 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
1042 | fuse_copy_finish(cs); | |
a4d27e75 MS |
1043 | |
1044 | return err ? err : reqsize; | |
1045 | } | |
1046 | ||
02c048b9 MS |
1047 | static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc, |
1048 | unsigned max, | |
1049 | unsigned *countp) | |
07e77dca | 1050 | { |
02c048b9 MS |
1051 | struct fuse_forget_link *head = fc->forget_list_head.next; |
1052 | struct fuse_forget_link **newhead = &head; | |
1053 | unsigned count; | |
07e77dca | 1054 | |
02c048b9 MS |
1055 | for (count = 0; *newhead != NULL && count < max; count++) |
1056 | newhead = &(*newhead)->next; | |
1057 | ||
1058 | fc->forget_list_head.next = *newhead; | |
1059 | *newhead = NULL; | |
07e77dca MS |
1060 | if (fc->forget_list_head.next == NULL) |
1061 | fc->forget_list_tail = &fc->forget_list_head; | |
1062 | ||
02c048b9 MS |
1063 | if (countp != NULL) |
1064 | *countp = count; | |
1065 | ||
1066 | return head; | |
07e77dca MS |
1067 | } |
1068 | ||
1069 | static int fuse_read_single_forget(struct fuse_conn *fc, | |
1070 | struct fuse_copy_state *cs, | |
1071 | size_t nbytes) | |
1072 | __releases(fc->lock) | |
1073 | { | |
1074 | int err; | |
02c048b9 | 1075 | struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL); |
07e77dca | 1076 | struct fuse_forget_in arg = { |
02c048b9 | 1077 | .nlookup = forget->forget_one.nlookup, |
07e77dca MS |
1078 | }; |
1079 | struct fuse_in_header ih = { | |
1080 | .opcode = FUSE_FORGET, | |
02c048b9 | 1081 | .nodeid = forget->forget_one.nodeid, |
07e77dca MS |
1082 | .unique = fuse_get_unique(fc), |
1083 | .len = sizeof(ih) + sizeof(arg), | |
1084 | }; | |
1085 | ||
1086 | spin_unlock(&fc->lock); | |
1087 | kfree(forget); | |
1088 | if (nbytes < ih.len) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1092 | if (!err) | |
1093 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1094 | fuse_copy_finish(cs); | |
1095 | ||
1096 | if (err) | |
1097 | return err; | |
1098 | ||
1099 | return ih.len; | |
1100 | } | |
1101 | ||
02c048b9 MS |
1102 | static int fuse_read_batch_forget(struct fuse_conn *fc, |
1103 | struct fuse_copy_state *cs, size_t nbytes) | |
1104 | __releases(fc->lock) | |
1105 | { | |
1106 | int err; | |
1107 | unsigned max_forgets; | |
1108 | unsigned count; | |
1109 | struct fuse_forget_link *head; | |
1110 | struct fuse_batch_forget_in arg = { .count = 0 }; | |
1111 | struct fuse_in_header ih = { | |
1112 | .opcode = FUSE_BATCH_FORGET, | |
1113 | .unique = fuse_get_unique(fc), | |
1114 | .len = sizeof(ih) + sizeof(arg), | |
1115 | }; | |
1116 | ||
1117 | if (nbytes < ih.len) { | |
1118 | spin_unlock(&fc->lock); | |
1119 | return -EINVAL; | |
1120 | } | |
1121 | ||
1122 | max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one); | |
1123 | head = dequeue_forget(fc, max_forgets, &count); | |
1124 | spin_unlock(&fc->lock); | |
1125 | ||
1126 | arg.count = count; | |
1127 | ih.len += count * sizeof(struct fuse_forget_one); | |
1128 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1129 | if (!err) | |
1130 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1131 | ||
1132 | while (head) { | |
1133 | struct fuse_forget_link *forget = head; | |
1134 | ||
1135 | if (!err) { | |
1136 | err = fuse_copy_one(cs, &forget->forget_one, | |
1137 | sizeof(forget->forget_one)); | |
1138 | } | |
1139 | head = forget->next; | |
1140 | kfree(forget); | |
1141 | } | |
1142 | ||
1143 | fuse_copy_finish(cs); | |
1144 | ||
1145 | if (err) | |
1146 | return err; | |
1147 | ||
1148 | return ih.len; | |
1149 | } | |
1150 | ||
1151 | static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs, | |
1152 | size_t nbytes) | |
1153 | __releases(fc->lock) | |
1154 | { | |
1155 | if (fc->minor < 16 || fc->forget_list_head.next->next == NULL) | |
1156 | return fuse_read_single_forget(fc, cs, nbytes); | |
1157 | else | |
1158 | return fuse_read_batch_forget(fc, cs, nbytes); | |
1159 | } | |
1160 | ||
334f485d MS |
1161 | /* |
1162 | * Read a single request into the userspace filesystem's buffer. This | |
1163 | * function waits until a request is available, then removes it from | |
1164 | * the pending list and copies request data to userspace buffer. If | |
f9a2842e MS |
1165 | * no reply is needed (FORGET) or request has been aborted or there |
1166 | * was an error during the copying then it's finished by calling | |
334f485d MS |
1167 | * request_end(). Otherwise add it to the processing list, and set |
1168 | * the 'sent' flag. | |
1169 | */ | |
c3021629 MS |
1170 | static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, |
1171 | struct fuse_copy_state *cs, size_t nbytes) | |
334f485d MS |
1172 | { |
1173 | int err; | |
334f485d MS |
1174 | struct fuse_req *req; |
1175 | struct fuse_in *in; | |
334f485d MS |
1176 | unsigned reqsize; |
1177 | ||
1d3d752b | 1178 | restart: |
d7133114 | 1179 | spin_lock(&fc->lock); |
e5ac1d1e JD |
1180 | err = -EAGAIN; |
1181 | if ((file->f_flags & O_NONBLOCK) && fc->connected && | |
a4d27e75 | 1182 | !request_pending(fc)) |
e5ac1d1e JD |
1183 | goto err_unlock; |
1184 | ||
334f485d MS |
1185 | request_wait(fc); |
1186 | err = -ENODEV; | |
9ba7cbba | 1187 | if (!fc->connected) |
334f485d MS |
1188 | goto err_unlock; |
1189 | err = -ERESTARTSYS; | |
a4d27e75 | 1190 | if (!request_pending(fc)) |
334f485d MS |
1191 | goto err_unlock; |
1192 | ||
a4d27e75 MS |
1193 | if (!list_empty(&fc->interrupts)) { |
1194 | req = list_entry(fc->interrupts.next, struct fuse_req, | |
1195 | intr_entry); | |
c3021629 | 1196 | return fuse_read_interrupt(fc, cs, nbytes, req); |
a4d27e75 MS |
1197 | } |
1198 | ||
07e77dca MS |
1199 | if (forget_pending(fc)) { |
1200 | if (list_empty(&fc->pending) || fc->forget_batch-- > 0) | |
02c048b9 | 1201 | return fuse_read_forget(fc, cs, nbytes); |
07e77dca MS |
1202 | |
1203 | if (fc->forget_batch <= -8) | |
1204 | fc->forget_batch = 16; | |
1205 | } | |
1206 | ||
334f485d | 1207 | req = list_entry(fc->pending.next, struct fuse_req, list); |
83cfd493 | 1208 | req->state = FUSE_REQ_READING; |
d77a1d5b | 1209 | list_move(&req->list, &fc->io); |
334f485d MS |
1210 | |
1211 | in = &req->in; | |
1d3d752b MS |
1212 | reqsize = in->h.len; |
1213 | /* If request is too large, reply with an error and restart the read */ | |
c3021629 | 1214 | if (nbytes < reqsize) { |
1d3d752b MS |
1215 | req->out.h.error = -EIO; |
1216 | /* SETXATTR is special, since it may contain too large data */ | |
1217 | if (in->h.opcode == FUSE_SETXATTR) | |
1218 | req->out.h.error = -E2BIG; | |
1219 | request_end(fc, req); | |
1220 | goto restart; | |
334f485d | 1221 | } |
d7133114 | 1222 | spin_unlock(&fc->lock); |
c3021629 MS |
1223 | cs->req = req; |
1224 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); | |
1d3d752b | 1225 | if (!err) |
c3021629 | 1226 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
1d3d752b | 1227 | (struct fuse_arg *) in->args, 0); |
c3021629 | 1228 | fuse_copy_finish(cs); |
d7133114 | 1229 | spin_lock(&fc->lock); |
334f485d | 1230 | req->locked = 0; |
c9c9d7df MS |
1231 | if (req->aborted) { |
1232 | request_end(fc, req); | |
1233 | return -ENODEV; | |
1234 | } | |
334f485d | 1235 | if (err) { |
c9c9d7df | 1236 | req->out.h.error = -EIO; |
334f485d MS |
1237 | request_end(fc, req); |
1238 | return err; | |
1239 | } | |
1240 | if (!req->isreply) | |
1241 | request_end(fc, req); | |
1242 | else { | |
83cfd493 | 1243 | req->state = FUSE_REQ_SENT; |
d77a1d5b | 1244 | list_move_tail(&req->list, &fc->processing); |
a4d27e75 MS |
1245 | if (req->interrupted) |
1246 | queue_interrupt(fc, req); | |
d7133114 | 1247 | spin_unlock(&fc->lock); |
334f485d MS |
1248 | } |
1249 | return reqsize; | |
1250 | ||
1251 | err_unlock: | |
d7133114 | 1252 | spin_unlock(&fc->lock); |
334f485d MS |
1253 | return err; |
1254 | } | |
1255 | ||
c3021629 MS |
1256 | static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, |
1257 | unsigned long nr_segs, loff_t pos) | |
1258 | { | |
1259 | struct fuse_copy_state cs; | |
1260 | struct file *file = iocb->ki_filp; | |
1261 | struct fuse_conn *fc = fuse_get_conn(file); | |
1262 | if (!fc) | |
1263 | return -EPERM; | |
1264 | ||
1265 | fuse_copy_init(&cs, fc, 1, iov, nr_segs); | |
1266 | ||
1267 | return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs)); | |
1268 | } | |
1269 | ||
1270 | static int fuse_dev_pipe_buf_steal(struct pipe_inode_info *pipe, | |
1271 | struct pipe_buffer *buf) | |
1272 | { | |
1273 | return 1; | |
1274 | } | |
1275 | ||
1276 | static const struct pipe_buf_operations fuse_dev_pipe_buf_ops = { | |
1277 | .can_merge = 0, | |
1278 | .map = generic_pipe_buf_map, | |
1279 | .unmap = generic_pipe_buf_unmap, | |
1280 | .confirm = generic_pipe_buf_confirm, | |
1281 | .release = generic_pipe_buf_release, | |
1282 | .steal = fuse_dev_pipe_buf_steal, | |
1283 | .get = generic_pipe_buf_get, | |
1284 | }; | |
1285 | ||
1286 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, | |
1287 | struct pipe_inode_info *pipe, | |
1288 | size_t len, unsigned int flags) | |
1289 | { | |
1290 | int ret; | |
1291 | int page_nr = 0; | |
1292 | int do_wakeup = 0; | |
1293 | struct pipe_buffer *bufs; | |
1294 | struct fuse_copy_state cs; | |
1295 | struct fuse_conn *fc = fuse_get_conn(in); | |
1296 | if (!fc) | |
1297 | return -EPERM; | |
1298 | ||
07e77dca | 1299 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
c3021629 MS |
1300 | if (!bufs) |
1301 | return -ENOMEM; | |
1302 | ||
1303 | fuse_copy_init(&cs, fc, 1, NULL, 0); | |
1304 | cs.pipebufs = bufs; | |
1305 | cs.pipe = pipe; | |
1306 | ret = fuse_dev_do_read(fc, in, &cs, len); | |
1307 | if (ret < 0) | |
1308 | goto out; | |
1309 | ||
1310 | ret = 0; | |
1311 | pipe_lock(pipe); | |
1312 | ||
1313 | if (!pipe->readers) { | |
1314 | send_sig(SIGPIPE, current, 0); | |
1315 | if (!ret) | |
1316 | ret = -EPIPE; | |
1317 | goto out_unlock; | |
1318 | } | |
1319 | ||
1320 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { | |
1321 | ret = -EIO; | |
1322 | goto out_unlock; | |
1323 | } | |
1324 | ||
1325 | while (page_nr < cs.nr_segs) { | |
1326 | int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); | |
1327 | struct pipe_buffer *buf = pipe->bufs + newbuf; | |
1328 | ||
1329 | buf->page = bufs[page_nr].page; | |
1330 | buf->offset = bufs[page_nr].offset; | |
1331 | buf->len = bufs[page_nr].len; | |
1332 | buf->ops = &fuse_dev_pipe_buf_ops; | |
1333 | ||
1334 | pipe->nrbufs++; | |
1335 | page_nr++; | |
1336 | ret += buf->len; | |
1337 | ||
1338 | if (pipe->inode) | |
1339 | do_wakeup = 1; | |
1340 | } | |
1341 | ||
1342 | out_unlock: | |
1343 | pipe_unlock(pipe); | |
1344 | ||
1345 | if (do_wakeup) { | |
1346 | smp_mb(); | |
1347 | if (waitqueue_active(&pipe->wait)) | |
1348 | wake_up_interruptible(&pipe->wait); | |
1349 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); | |
1350 | } | |
1351 | ||
1352 | out: | |
1353 | for (; page_nr < cs.nr_segs; page_nr++) | |
1354 | page_cache_release(bufs[page_nr].page); | |
1355 | ||
1356 | kfree(bufs); | |
1357 | return ret; | |
1358 | } | |
1359 | ||
95668a69 TH |
1360 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
1361 | struct fuse_copy_state *cs) | |
1362 | { | |
1363 | struct fuse_notify_poll_wakeup_out outarg; | |
f6d47a17 | 1364 | int err = -EINVAL; |
95668a69 TH |
1365 | |
1366 | if (size != sizeof(outarg)) | |
f6d47a17 | 1367 | goto err; |
95668a69 TH |
1368 | |
1369 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1370 | if (err) | |
f6d47a17 | 1371 | goto err; |
95668a69 | 1372 | |
f6d47a17 | 1373 | fuse_copy_finish(cs); |
95668a69 | 1374 | return fuse_notify_poll_wakeup(fc, &outarg); |
f6d47a17 MS |
1375 | |
1376 | err: | |
1377 | fuse_copy_finish(cs); | |
1378 | return err; | |
95668a69 TH |
1379 | } |
1380 | ||
3b463ae0 JM |
1381 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
1382 | struct fuse_copy_state *cs) | |
1383 | { | |
1384 | struct fuse_notify_inval_inode_out outarg; | |
1385 | int err = -EINVAL; | |
1386 | ||
1387 | if (size != sizeof(outarg)) | |
1388 | goto err; | |
1389 | ||
1390 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1391 | if (err) | |
1392 | goto err; | |
1393 | fuse_copy_finish(cs); | |
1394 | ||
1395 | down_read(&fc->killsb); | |
1396 | err = -ENOENT; | |
b21dda43 MS |
1397 | if (fc->sb) { |
1398 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, | |
1399 | outarg.off, outarg.len); | |
1400 | } | |
3b463ae0 JM |
1401 | up_read(&fc->killsb); |
1402 | return err; | |
1403 | ||
1404 | err: | |
1405 | fuse_copy_finish(cs); | |
1406 | return err; | |
1407 | } | |
1408 | ||
1409 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, | |
1410 | struct fuse_copy_state *cs) | |
1411 | { | |
1412 | struct fuse_notify_inval_entry_out outarg; | |
b2d82ee3 FW |
1413 | int err = -ENOMEM; |
1414 | char *buf; | |
3b463ae0 JM |
1415 | struct qstr name; |
1416 | ||
b2d82ee3 FW |
1417 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
1418 | if (!buf) | |
1419 | goto err; | |
1420 | ||
1421 | err = -EINVAL; | |
3b463ae0 JM |
1422 | if (size < sizeof(outarg)) |
1423 | goto err; | |
1424 | ||
1425 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1426 | if (err) | |
1427 | goto err; | |
1428 | ||
1429 | err = -ENAMETOOLONG; | |
1430 | if (outarg.namelen > FUSE_NAME_MAX) | |
1431 | goto err; | |
1432 | ||
c2183d1e MS |
1433 | err = -EINVAL; |
1434 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1435 | goto err; | |
1436 | ||
3b463ae0 JM |
1437 | name.name = buf; |
1438 | name.len = outarg.namelen; | |
1439 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1440 | if (err) | |
1441 | goto err; | |
1442 | fuse_copy_finish(cs); | |
1443 | buf[outarg.namelen] = 0; | |
1444 | name.hash = full_name_hash(name.name, name.len); | |
1445 | ||
1446 | down_read(&fc->killsb); | |
1447 | err = -ENOENT; | |
b21dda43 | 1448 | if (fc->sb) |
451d0f59 JM |
1449 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name); |
1450 | up_read(&fc->killsb); | |
1451 | kfree(buf); | |
1452 | return err; | |
1453 | ||
1454 | err: | |
1455 | kfree(buf); | |
1456 | fuse_copy_finish(cs); | |
1457 | return err; | |
1458 | } | |
1459 | ||
1460 | static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size, | |
1461 | struct fuse_copy_state *cs) | |
1462 | { | |
1463 | struct fuse_notify_delete_out outarg; | |
1464 | int err = -ENOMEM; | |
1465 | char *buf; | |
1466 | struct qstr name; | |
1467 | ||
1468 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); | |
1469 | if (!buf) | |
1470 | goto err; | |
1471 | ||
1472 | err = -EINVAL; | |
1473 | if (size < sizeof(outarg)) | |
1474 | goto err; | |
1475 | ||
1476 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1477 | if (err) | |
1478 | goto err; | |
1479 | ||
1480 | err = -ENAMETOOLONG; | |
1481 | if (outarg.namelen > FUSE_NAME_MAX) | |
1482 | goto err; | |
1483 | ||
1484 | err = -EINVAL; | |
1485 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1486 | goto err; | |
1487 | ||
1488 | name.name = buf; | |
1489 | name.len = outarg.namelen; | |
1490 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1491 | if (err) | |
1492 | goto err; | |
1493 | fuse_copy_finish(cs); | |
1494 | buf[outarg.namelen] = 0; | |
1495 | name.hash = full_name_hash(name.name, name.len); | |
1496 | ||
1497 | down_read(&fc->killsb); | |
1498 | err = -ENOENT; | |
1499 | if (fc->sb) | |
1500 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, | |
1501 | outarg.child, &name); | |
3b463ae0 | 1502 | up_read(&fc->killsb); |
b2d82ee3 | 1503 | kfree(buf); |
3b463ae0 JM |
1504 | return err; |
1505 | ||
1506 | err: | |
b2d82ee3 | 1507 | kfree(buf); |
3b463ae0 JM |
1508 | fuse_copy_finish(cs); |
1509 | return err; | |
1510 | } | |
1511 | ||
a1d75f25 MS |
1512 | static int fuse_notify_store(struct fuse_conn *fc, unsigned int size, |
1513 | struct fuse_copy_state *cs) | |
1514 | { | |
1515 | struct fuse_notify_store_out outarg; | |
1516 | struct inode *inode; | |
1517 | struct address_space *mapping; | |
1518 | u64 nodeid; | |
1519 | int err; | |
1520 | pgoff_t index; | |
1521 | unsigned int offset; | |
1522 | unsigned int num; | |
1523 | loff_t file_size; | |
1524 | loff_t end; | |
1525 | ||
1526 | err = -EINVAL; | |
1527 | if (size < sizeof(outarg)) | |
1528 | goto out_finish; | |
1529 | ||
1530 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1531 | if (err) | |
1532 | goto out_finish; | |
1533 | ||
1534 | err = -EINVAL; | |
1535 | if (size - sizeof(outarg) != outarg.size) | |
1536 | goto out_finish; | |
1537 | ||
1538 | nodeid = outarg.nodeid; | |
1539 | ||
1540 | down_read(&fc->killsb); | |
1541 | ||
1542 | err = -ENOENT; | |
1543 | if (!fc->sb) | |
1544 | goto out_up_killsb; | |
1545 | ||
1546 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1547 | if (!inode) | |
1548 | goto out_up_killsb; | |
1549 | ||
1550 | mapping = inode->i_mapping; | |
1551 | index = outarg.offset >> PAGE_CACHE_SHIFT; | |
1552 | offset = outarg.offset & ~PAGE_CACHE_MASK; | |
1553 | file_size = i_size_read(inode); | |
1554 | end = outarg.offset + outarg.size; | |
1555 | if (end > file_size) { | |
1556 | file_size = end; | |
1557 | fuse_write_update_size(inode, file_size); | |
1558 | } | |
1559 | ||
1560 | num = outarg.size; | |
1561 | while (num) { | |
1562 | struct page *page; | |
1563 | unsigned int this_num; | |
1564 | ||
1565 | err = -ENOMEM; | |
1566 | page = find_or_create_page(mapping, index, | |
1567 | mapping_gfp_mask(mapping)); | |
1568 | if (!page) | |
1569 | goto out_iput; | |
1570 | ||
1571 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); | |
1572 | err = fuse_copy_page(cs, &page, offset, this_num, 0); | |
1573 | if (!err && offset == 0 && (num != 0 || file_size == end)) | |
1574 | SetPageUptodate(page); | |
1575 | unlock_page(page); | |
1576 | page_cache_release(page); | |
1577 | ||
1578 | if (err) | |
1579 | goto out_iput; | |
1580 | ||
1581 | num -= this_num; | |
1582 | offset = 0; | |
1583 | index++; | |
1584 | } | |
1585 | ||
1586 | err = 0; | |
1587 | ||
1588 | out_iput: | |
1589 | iput(inode); | |
1590 | out_up_killsb: | |
1591 | up_read(&fc->killsb); | |
1592 | out_finish: | |
1593 | fuse_copy_finish(cs); | |
1594 | return err; | |
1595 | } | |
1596 | ||
2d45ba38 MS |
1597 | static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req) |
1598 | { | |
0be8557b | 1599 | release_pages(req->pages, req->num_pages, 0); |
2d45ba38 MS |
1600 | } |
1601 | ||
1602 | static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode, | |
1603 | struct fuse_notify_retrieve_out *outarg) | |
1604 | { | |
1605 | int err; | |
1606 | struct address_space *mapping = inode->i_mapping; | |
1607 | struct fuse_req *req; | |
1608 | pgoff_t index; | |
1609 | loff_t file_size; | |
1610 | unsigned int num; | |
1611 | unsigned int offset; | |
0157443c | 1612 | size_t total_len = 0; |
4d53dc99 | 1613 | int num_pages; |
2d45ba38 | 1614 | |
4d53dc99 MP |
1615 | offset = outarg->offset & ~PAGE_CACHE_MASK; |
1616 | file_size = i_size_read(inode); | |
1617 | ||
1618 | num = outarg->size; | |
1619 | if (outarg->offset > file_size) | |
1620 | num = 0; | |
1621 | else if (outarg->offset + num > file_size) | |
1622 | num = file_size - outarg->offset; | |
1623 | ||
1624 | num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
1625 | num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ); | |
1626 | ||
1627 | req = fuse_get_req(fc, num_pages); | |
2d45ba38 MS |
1628 | if (IS_ERR(req)) |
1629 | return PTR_ERR(req); | |
1630 | ||
2d45ba38 MS |
1631 | req->in.h.opcode = FUSE_NOTIFY_REPLY; |
1632 | req->in.h.nodeid = outarg->nodeid; | |
1633 | req->in.numargs = 2; | |
1634 | req->in.argpages = 1; | |
b2430d75 | 1635 | req->page_descs[0].offset = offset; |
2d45ba38 MS |
1636 | req->end = fuse_retrieve_end; |
1637 | ||
1638 | index = outarg->offset >> PAGE_CACHE_SHIFT; | |
2d45ba38 | 1639 | |
4d53dc99 | 1640 | while (num && req->num_pages < num_pages) { |
2d45ba38 MS |
1641 | struct page *page; |
1642 | unsigned int this_num; | |
1643 | ||
1644 | page = find_get_page(mapping, index); | |
1645 | if (!page) | |
1646 | break; | |
1647 | ||
1648 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); | |
1649 | req->pages[req->num_pages] = page; | |
85f40aec | 1650 | req->page_descs[req->num_pages].length = this_num; |
2d45ba38 MS |
1651 | req->num_pages++; |
1652 | ||
c9e67d48 | 1653 | offset = 0; |
2d45ba38 MS |
1654 | num -= this_num; |
1655 | total_len += this_num; | |
48706d0a | 1656 | index++; |
2d45ba38 MS |
1657 | } |
1658 | req->misc.retrieve_in.offset = outarg->offset; | |
1659 | req->misc.retrieve_in.size = total_len; | |
1660 | req->in.args[0].size = sizeof(req->misc.retrieve_in); | |
1661 | req->in.args[0].value = &req->misc.retrieve_in; | |
1662 | req->in.args[1].size = total_len; | |
1663 | ||
1664 | err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique); | |
1665 | if (err) | |
1666 | fuse_retrieve_end(fc, req); | |
1667 | ||
1668 | return err; | |
1669 | } | |
1670 | ||
1671 | static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size, | |
1672 | struct fuse_copy_state *cs) | |
1673 | { | |
1674 | struct fuse_notify_retrieve_out outarg; | |
1675 | struct inode *inode; | |
1676 | int err; | |
1677 | ||
1678 | err = -EINVAL; | |
1679 | if (size != sizeof(outarg)) | |
1680 | goto copy_finish; | |
1681 | ||
1682 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1683 | if (err) | |
1684 | goto copy_finish; | |
1685 | ||
1686 | fuse_copy_finish(cs); | |
1687 | ||
1688 | down_read(&fc->killsb); | |
1689 | err = -ENOENT; | |
1690 | if (fc->sb) { | |
1691 | u64 nodeid = outarg.nodeid; | |
1692 | ||
1693 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1694 | if (inode) { | |
1695 | err = fuse_retrieve(fc, inode, &outarg); | |
1696 | iput(inode); | |
1697 | } | |
1698 | } | |
1699 | up_read(&fc->killsb); | |
1700 | ||
1701 | return err; | |
1702 | ||
1703 | copy_finish: | |
1704 | fuse_copy_finish(cs); | |
1705 | return err; | |
1706 | } | |
1707 | ||
8599396b TH |
1708 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
1709 | unsigned int size, struct fuse_copy_state *cs) | |
1710 | { | |
1711 | switch (code) { | |
95668a69 TH |
1712 | case FUSE_NOTIFY_POLL: |
1713 | return fuse_notify_poll(fc, size, cs); | |
1714 | ||
3b463ae0 JM |
1715 | case FUSE_NOTIFY_INVAL_INODE: |
1716 | return fuse_notify_inval_inode(fc, size, cs); | |
1717 | ||
1718 | case FUSE_NOTIFY_INVAL_ENTRY: | |
1719 | return fuse_notify_inval_entry(fc, size, cs); | |
1720 | ||
a1d75f25 MS |
1721 | case FUSE_NOTIFY_STORE: |
1722 | return fuse_notify_store(fc, size, cs); | |
1723 | ||
2d45ba38 MS |
1724 | case FUSE_NOTIFY_RETRIEVE: |
1725 | return fuse_notify_retrieve(fc, size, cs); | |
1726 | ||
451d0f59 JM |
1727 | case FUSE_NOTIFY_DELETE: |
1728 | return fuse_notify_delete(fc, size, cs); | |
1729 | ||
8599396b | 1730 | default: |
f6d47a17 | 1731 | fuse_copy_finish(cs); |
8599396b TH |
1732 | return -EINVAL; |
1733 | } | |
1734 | } | |
1735 | ||
334f485d MS |
1736 | /* Look up request on processing list by unique ID */ |
1737 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) | |
1738 | { | |
1739 | struct list_head *entry; | |
1740 | ||
1741 | list_for_each(entry, &fc->processing) { | |
1742 | struct fuse_req *req; | |
1743 | req = list_entry(entry, struct fuse_req, list); | |
a4d27e75 | 1744 | if (req->in.h.unique == unique || req->intr_unique == unique) |
334f485d MS |
1745 | return req; |
1746 | } | |
1747 | return NULL; | |
1748 | } | |
1749 | ||
1750 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, | |
1751 | unsigned nbytes) | |
1752 | { | |
1753 | unsigned reqsize = sizeof(struct fuse_out_header); | |
1754 | ||
1755 | if (out->h.error) | |
1756 | return nbytes != reqsize ? -EINVAL : 0; | |
1757 | ||
1758 | reqsize += len_args(out->numargs, out->args); | |
1759 | ||
1760 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) | |
1761 | return -EINVAL; | |
1762 | else if (reqsize > nbytes) { | |
1763 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; | |
1764 | unsigned diffsize = reqsize - nbytes; | |
1765 | if (diffsize > lastarg->size) | |
1766 | return -EINVAL; | |
1767 | lastarg->size -= diffsize; | |
1768 | } | |
1769 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, | |
1770 | out->page_zeroing); | |
1771 | } | |
1772 | ||
1773 | /* | |
1774 | * Write a single reply to a request. First the header is copied from | |
1775 | * the write buffer. The request is then searched on the processing | |
1776 | * list by the unique ID found in the header. If found, then remove | |
1777 | * it from the list and copy the rest of the buffer to the request. | |
1778 | * The request is finished by calling request_end() | |
1779 | */ | |
dd3bb14f MS |
1780 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
1781 | struct fuse_copy_state *cs, size_t nbytes) | |
334f485d MS |
1782 | { |
1783 | int err; | |
334f485d MS |
1784 | struct fuse_req *req; |
1785 | struct fuse_out_header oh; | |
334f485d | 1786 | |
334f485d MS |
1787 | if (nbytes < sizeof(struct fuse_out_header)) |
1788 | return -EINVAL; | |
1789 | ||
dd3bb14f | 1790 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
334f485d MS |
1791 | if (err) |
1792 | goto err_finish; | |
8599396b TH |
1793 | |
1794 | err = -EINVAL; | |
1795 | if (oh.len != nbytes) | |
1796 | goto err_finish; | |
1797 | ||
1798 | /* | |
1799 | * Zero oh.unique indicates unsolicited notification message | |
1800 | * and error contains notification code. | |
1801 | */ | |
1802 | if (!oh.unique) { | |
dd3bb14f | 1803 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
8599396b TH |
1804 | return err ? err : nbytes; |
1805 | } | |
1806 | ||
334f485d | 1807 | err = -EINVAL; |
8599396b | 1808 | if (oh.error <= -1000 || oh.error > 0) |
334f485d MS |
1809 | goto err_finish; |
1810 | ||
d7133114 | 1811 | spin_lock(&fc->lock); |
69a53bf2 MS |
1812 | err = -ENOENT; |
1813 | if (!fc->connected) | |
1814 | goto err_unlock; | |
1815 | ||
334f485d | 1816 | req = request_find(fc, oh.unique); |
334f485d MS |
1817 | if (!req) |
1818 | goto err_unlock; | |
1819 | ||
f9a2842e | 1820 | if (req->aborted) { |
d7133114 | 1821 | spin_unlock(&fc->lock); |
dd3bb14f | 1822 | fuse_copy_finish(cs); |
d7133114 | 1823 | spin_lock(&fc->lock); |
222f1d69 | 1824 | request_end(fc, req); |
334f485d MS |
1825 | return -ENOENT; |
1826 | } | |
a4d27e75 MS |
1827 | /* Is it an interrupt reply? */ |
1828 | if (req->intr_unique == oh.unique) { | |
1829 | err = -EINVAL; | |
1830 | if (nbytes != sizeof(struct fuse_out_header)) | |
1831 | goto err_unlock; | |
1832 | ||
1833 | if (oh.error == -ENOSYS) | |
1834 | fc->no_interrupt = 1; | |
1835 | else if (oh.error == -EAGAIN) | |
1836 | queue_interrupt(fc, req); | |
1837 | ||
1838 | spin_unlock(&fc->lock); | |
dd3bb14f | 1839 | fuse_copy_finish(cs); |
a4d27e75 MS |
1840 | return nbytes; |
1841 | } | |
1842 | ||
1843 | req->state = FUSE_REQ_WRITING; | |
d77a1d5b | 1844 | list_move(&req->list, &fc->io); |
334f485d MS |
1845 | req->out.h = oh; |
1846 | req->locked = 1; | |
dd3bb14f | 1847 | cs->req = req; |
ce534fb0 MS |
1848 | if (!req->out.page_replace) |
1849 | cs->move_pages = 0; | |
d7133114 | 1850 | spin_unlock(&fc->lock); |
334f485d | 1851 | |
dd3bb14f MS |
1852 | err = copy_out_args(cs, &req->out, nbytes); |
1853 | fuse_copy_finish(cs); | |
334f485d | 1854 | |
d7133114 | 1855 | spin_lock(&fc->lock); |
334f485d MS |
1856 | req->locked = 0; |
1857 | if (!err) { | |
f9a2842e | 1858 | if (req->aborted) |
334f485d | 1859 | err = -ENOENT; |
f9a2842e | 1860 | } else if (!req->aborted) |
334f485d MS |
1861 | req->out.h.error = -EIO; |
1862 | request_end(fc, req); | |
1863 | ||
1864 | return err ? err : nbytes; | |
1865 | ||
1866 | err_unlock: | |
d7133114 | 1867 | spin_unlock(&fc->lock); |
334f485d | 1868 | err_finish: |
dd3bb14f | 1869 | fuse_copy_finish(cs); |
334f485d MS |
1870 | return err; |
1871 | } | |
1872 | ||
dd3bb14f MS |
1873 | static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, |
1874 | unsigned long nr_segs, loff_t pos) | |
1875 | { | |
1876 | struct fuse_copy_state cs; | |
1877 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); | |
1878 | if (!fc) | |
1879 | return -EPERM; | |
1880 | ||
c3021629 | 1881 | fuse_copy_init(&cs, fc, 0, iov, nr_segs); |
dd3bb14f MS |
1882 | |
1883 | return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs)); | |
1884 | } | |
1885 | ||
1886 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, | |
1887 | struct file *out, loff_t *ppos, | |
1888 | size_t len, unsigned int flags) | |
1889 | { | |
1890 | unsigned nbuf; | |
1891 | unsigned idx; | |
1892 | struct pipe_buffer *bufs; | |
1893 | struct fuse_copy_state cs; | |
1894 | struct fuse_conn *fc; | |
1895 | size_t rem; | |
1896 | ssize_t ret; | |
1897 | ||
1898 | fc = fuse_get_conn(out); | |
1899 | if (!fc) | |
1900 | return -EPERM; | |
1901 | ||
07e77dca | 1902 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
dd3bb14f MS |
1903 | if (!bufs) |
1904 | return -ENOMEM; | |
1905 | ||
1906 | pipe_lock(pipe); | |
1907 | nbuf = 0; | |
1908 | rem = 0; | |
1909 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) | |
1910 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; | |
1911 | ||
1912 | ret = -EINVAL; | |
1913 | if (rem < len) { | |
1914 | pipe_unlock(pipe); | |
1915 | goto out; | |
1916 | } | |
1917 | ||
1918 | rem = len; | |
1919 | while (rem) { | |
1920 | struct pipe_buffer *ibuf; | |
1921 | struct pipe_buffer *obuf; | |
1922 | ||
1923 | BUG_ON(nbuf >= pipe->buffers); | |
1924 | BUG_ON(!pipe->nrbufs); | |
1925 | ibuf = &pipe->bufs[pipe->curbuf]; | |
1926 | obuf = &bufs[nbuf]; | |
1927 | ||
1928 | if (rem >= ibuf->len) { | |
1929 | *obuf = *ibuf; | |
1930 | ibuf->ops = NULL; | |
1931 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); | |
1932 | pipe->nrbufs--; | |
1933 | } else { | |
1934 | ibuf->ops->get(pipe, ibuf); | |
1935 | *obuf = *ibuf; | |
1936 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; | |
1937 | obuf->len = rem; | |
1938 | ibuf->offset += obuf->len; | |
1939 | ibuf->len -= obuf->len; | |
1940 | } | |
1941 | nbuf++; | |
1942 | rem -= obuf->len; | |
1943 | } | |
1944 | pipe_unlock(pipe); | |
1945 | ||
c3021629 | 1946 | fuse_copy_init(&cs, fc, 0, NULL, nbuf); |
dd3bb14f | 1947 | cs.pipebufs = bufs; |
dd3bb14f MS |
1948 | cs.pipe = pipe; |
1949 | ||
ce534fb0 MS |
1950 | if (flags & SPLICE_F_MOVE) |
1951 | cs.move_pages = 1; | |
1952 | ||
dd3bb14f MS |
1953 | ret = fuse_dev_do_write(fc, &cs, len); |
1954 | ||
1955 | for (idx = 0; idx < nbuf; idx++) { | |
1956 | struct pipe_buffer *buf = &bufs[idx]; | |
1957 | buf->ops->release(pipe, buf); | |
1958 | } | |
1959 | out: | |
1960 | kfree(bufs); | |
1961 | return ret; | |
1962 | } | |
1963 | ||
334f485d MS |
1964 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
1965 | { | |
334f485d | 1966 | unsigned mask = POLLOUT | POLLWRNORM; |
7025d9ad | 1967 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 1968 | if (!fc) |
7025d9ad | 1969 | return POLLERR; |
334f485d MS |
1970 | |
1971 | poll_wait(file, &fc->waitq, wait); | |
1972 | ||
d7133114 | 1973 | spin_lock(&fc->lock); |
7025d9ad MS |
1974 | if (!fc->connected) |
1975 | mask = POLLERR; | |
a4d27e75 | 1976 | else if (request_pending(fc)) |
7025d9ad | 1977 | mask |= POLLIN | POLLRDNORM; |
d7133114 | 1978 | spin_unlock(&fc->lock); |
334f485d MS |
1979 | |
1980 | return mask; | |
1981 | } | |
1982 | ||
69a53bf2 MS |
1983 | /* |
1984 | * Abort all requests on the given list (pending or processing) | |
1985 | * | |
d7133114 | 1986 | * This function releases and reacquires fc->lock |
69a53bf2 | 1987 | */ |
334f485d | 1988 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
b9ca67b2 MS |
1989 | __releases(fc->lock) |
1990 | __acquires(fc->lock) | |
334f485d MS |
1991 | { |
1992 | while (!list_empty(head)) { | |
1993 | struct fuse_req *req; | |
1994 | req = list_entry(head->next, struct fuse_req, list); | |
334f485d MS |
1995 | req->out.h.error = -ECONNABORTED; |
1996 | request_end(fc, req); | |
d7133114 | 1997 | spin_lock(&fc->lock); |
334f485d MS |
1998 | } |
1999 | } | |
2000 | ||
69a53bf2 MS |
2001 | /* |
2002 | * Abort requests under I/O | |
2003 | * | |
f9a2842e | 2004 | * The requests are set to aborted and finished, and the request |
69a53bf2 MS |
2005 | * waiter is woken up. This will make request_wait_answer() wait |
2006 | * until the request is unlocked and then return. | |
64c6d8ed MS |
2007 | * |
2008 | * If the request is asynchronous, then the end function needs to be | |
2009 | * called after waiting for the request to be unlocked (if it was | |
2010 | * locked). | |
69a53bf2 MS |
2011 | */ |
2012 | static void end_io_requests(struct fuse_conn *fc) | |
b9ca67b2 MS |
2013 | __releases(fc->lock) |
2014 | __acquires(fc->lock) | |
69a53bf2 MS |
2015 | { |
2016 | while (!list_empty(&fc->io)) { | |
64c6d8ed MS |
2017 | struct fuse_req *req = |
2018 | list_entry(fc->io.next, struct fuse_req, list); | |
2019 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; | |
2020 | ||
f9a2842e | 2021 | req->aborted = 1; |
69a53bf2 MS |
2022 | req->out.h.error = -ECONNABORTED; |
2023 | req->state = FUSE_REQ_FINISHED; | |
2024 | list_del_init(&req->list); | |
2025 | wake_up(&req->waitq); | |
64c6d8ed MS |
2026 | if (end) { |
2027 | req->end = NULL; | |
64c6d8ed | 2028 | __fuse_get_request(req); |
d7133114 | 2029 | spin_unlock(&fc->lock); |
64c6d8ed MS |
2030 | wait_event(req->waitq, !req->locked); |
2031 | end(fc, req); | |
e9bb09dd | 2032 | fuse_put_request(fc, req); |
d7133114 | 2033 | spin_lock(&fc->lock); |
64c6d8ed | 2034 | } |
69a53bf2 MS |
2035 | } |
2036 | } | |
2037 | ||
595afaf9 | 2038 | static void end_queued_requests(struct fuse_conn *fc) |
b9ca67b2 MS |
2039 | __releases(fc->lock) |
2040 | __acquires(fc->lock) | |
595afaf9 MS |
2041 | { |
2042 | fc->max_background = UINT_MAX; | |
2043 | flush_bg_queue(fc); | |
2044 | end_requests(fc, &fc->pending); | |
2045 | end_requests(fc, &fc->processing); | |
07e77dca | 2046 | while (forget_pending(fc)) |
02c048b9 | 2047 | kfree(dequeue_forget(fc, 1, NULL)); |
595afaf9 MS |
2048 | } |
2049 | ||
357ccf2b BG |
2050 | static void end_polls(struct fuse_conn *fc) |
2051 | { | |
2052 | struct rb_node *p; | |
2053 | ||
2054 | p = rb_first(&fc->polled_files); | |
2055 | ||
2056 | while (p) { | |
2057 | struct fuse_file *ff; | |
2058 | ff = rb_entry(p, struct fuse_file, polled_node); | |
2059 | wake_up_interruptible_all(&ff->poll_wait); | |
2060 | ||
2061 | p = rb_next(p); | |
2062 | } | |
2063 | } | |
2064 | ||
69a53bf2 MS |
2065 | /* |
2066 | * Abort all requests. | |
2067 | * | |
2068 | * Emergency exit in case of a malicious or accidental deadlock, or | |
2069 | * just a hung filesystem. | |
2070 | * | |
2071 | * The same effect is usually achievable through killing the | |
2072 | * filesystem daemon and all users of the filesystem. The exception | |
2073 | * is the combination of an asynchronous request and the tricky | |
2074 | * deadlock (see Documentation/filesystems/fuse.txt). | |
2075 | * | |
2076 | * During the aborting, progression of requests from the pending and | |
2077 | * processing lists onto the io list, and progression of new requests | |
2078 | * onto the pending list is prevented by req->connected being false. | |
2079 | * | |
2080 | * Progression of requests under I/O to the processing list is | |
f9a2842e MS |
2081 | * prevented by the req->aborted flag being true for these requests. |
2082 | * For this reason requests on the io list must be aborted first. | |
69a53bf2 MS |
2083 | */ |
2084 | void fuse_abort_conn(struct fuse_conn *fc) | |
2085 | { | |
d7133114 | 2086 | spin_lock(&fc->lock); |
69a53bf2 MS |
2087 | if (fc->connected) { |
2088 | fc->connected = 0; | |
51eb01e7 | 2089 | fc->blocked = 0; |
796523fb | 2090 | fc->initialized = 1; |
69a53bf2 | 2091 | end_io_requests(fc); |
595afaf9 | 2092 | end_queued_requests(fc); |
357ccf2b | 2093 | end_polls(fc); |
69a53bf2 | 2094 | wake_up_all(&fc->waitq); |
51eb01e7 | 2095 | wake_up_all(&fc->blocked_waitq); |
385a17bf | 2096 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
69a53bf2 | 2097 | } |
d7133114 | 2098 | spin_unlock(&fc->lock); |
69a53bf2 | 2099 | } |
08cbf542 | 2100 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
69a53bf2 | 2101 | |
08cbf542 | 2102 | int fuse_dev_release(struct inode *inode, struct file *file) |
334f485d | 2103 | { |
0720b315 | 2104 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 2105 | if (fc) { |
d7133114 | 2106 | spin_lock(&fc->lock); |
1e9a4ed9 | 2107 | fc->connected = 0; |
595afaf9 MS |
2108 | fc->blocked = 0; |
2109 | end_queued_requests(fc); | |
357ccf2b | 2110 | end_polls(fc); |
595afaf9 | 2111 | wake_up_all(&fc->blocked_waitq); |
d7133114 | 2112 | spin_unlock(&fc->lock); |
bafa9654 | 2113 | fuse_conn_put(fc); |
385a17bf | 2114 | } |
f543f253 | 2115 | |
334f485d MS |
2116 | return 0; |
2117 | } | |
08cbf542 | 2118 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
334f485d | 2119 | |
385a17bf JD |
2120 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
2121 | { | |
2122 | struct fuse_conn *fc = fuse_get_conn(file); | |
2123 | if (!fc) | |
a87046d8 | 2124 | return -EPERM; |
385a17bf JD |
2125 | |
2126 | /* No locking - fasync_helper does its own locking */ | |
2127 | return fasync_helper(fd, file, on, &fc->fasync); | |
2128 | } | |
2129 | ||
4b6f5d20 | 2130 | const struct file_operations fuse_dev_operations = { |
334f485d MS |
2131 | .owner = THIS_MODULE, |
2132 | .llseek = no_llseek, | |
ee0b3e67 BP |
2133 | .read = do_sync_read, |
2134 | .aio_read = fuse_dev_read, | |
c3021629 | 2135 | .splice_read = fuse_dev_splice_read, |
ee0b3e67 BP |
2136 | .write = do_sync_write, |
2137 | .aio_write = fuse_dev_write, | |
dd3bb14f | 2138 | .splice_write = fuse_dev_splice_write, |
334f485d MS |
2139 | .poll = fuse_dev_poll, |
2140 | .release = fuse_dev_release, | |
385a17bf | 2141 | .fasync = fuse_dev_fasync, |
334f485d | 2142 | }; |
08cbf542 | 2143 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
334f485d MS |
2144 | |
2145 | static struct miscdevice fuse_miscdevice = { | |
2146 | .minor = FUSE_MINOR, | |
2147 | .name = "fuse", | |
2148 | .fops = &fuse_dev_operations, | |
2149 | }; | |
2150 | ||
2151 | int __init fuse_dev_init(void) | |
2152 | { | |
2153 | int err = -ENOMEM; | |
2154 | fuse_req_cachep = kmem_cache_create("fuse_request", | |
2155 | sizeof(struct fuse_req), | |
20c2df83 | 2156 | 0, 0, NULL); |
334f485d MS |
2157 | if (!fuse_req_cachep) |
2158 | goto out; | |
2159 | ||
2160 | err = misc_register(&fuse_miscdevice); | |
2161 | if (err) | |
2162 | goto out_cache_clean; | |
2163 | ||
2164 | return 0; | |
2165 | ||
2166 | out_cache_clean: | |
2167 | kmem_cache_destroy(fuse_req_cachep); | |
2168 | out: | |
2169 | return err; | |
2170 | } | |
2171 | ||
2172 | void fuse_dev_cleanup(void) | |
2173 | { | |
2174 | misc_deregister(&fuse_miscdevice); | |
2175 | kmem_cache_destroy(fuse_req_cachep); | |
2176 | } |