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 | ||
36cf66ed | 114 | void __fuse_get_request(struct fuse_req *req) |
334f485d MS |
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 | ||
9759bd51 MS |
133 | void fuse_set_initialized(struct fuse_conn *fc) |
134 | { | |
135 | /* Make sure stores before this are seen on another CPU */ | |
136 | smp_wmb(); | |
137 | fc->initialized = 1; | |
138 | } | |
139 | ||
0aada884 MP |
140 | static bool fuse_block_alloc(struct fuse_conn *fc, bool for_background) |
141 | { | |
142 | return !fc->initialized || (for_background && fc->blocked); | |
143 | } | |
144 | ||
8b41e671 MP |
145 | static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages, |
146 | bool for_background) | |
334f485d | 147 | { |
08a53cdc | 148 | struct fuse_req *req; |
08a53cdc | 149 | int err; |
9bc5ddda | 150 | atomic_inc(&fc->num_waiting); |
0aada884 MP |
151 | |
152 | if (fuse_block_alloc(fc, for_background)) { | |
153 | sigset_t oldset; | |
154 | int intr; | |
155 | ||
156 | block_sigs(&oldset); | |
722d2bea | 157 | intr = wait_event_interruptible_exclusive(fc->blocked_waitq, |
0aada884 MP |
158 | !fuse_block_alloc(fc, for_background)); |
159 | restore_sigs(&oldset); | |
160 | err = -EINTR; | |
161 | if (intr) | |
162 | goto out; | |
163 | } | |
9759bd51 MS |
164 | /* Matches smp_wmb() in fuse_set_initialized() */ |
165 | smp_rmb(); | |
08a53cdc | 166 | |
51eb01e7 MS |
167 | err = -ENOTCONN; |
168 | if (!fc->connected) | |
169 | goto out; | |
170 | ||
b111c8c0 | 171 | req = fuse_request_alloc(npages); |
9bc5ddda | 172 | err = -ENOMEM; |
722d2bea MP |
173 | if (!req) { |
174 | if (for_background) | |
175 | wake_up(&fc->blocked_waitq); | |
9bc5ddda | 176 | goto out; |
722d2bea | 177 | } |
334f485d | 178 | |
33649c91 | 179 | fuse_req_init_context(req); |
9bc5ddda | 180 | req->waiting = 1; |
8b41e671 | 181 | req->background = for_background; |
334f485d | 182 | return req; |
9bc5ddda MS |
183 | |
184 | out: | |
185 | atomic_dec(&fc->num_waiting); | |
186 | return ERR_PTR(err); | |
334f485d | 187 | } |
8b41e671 MP |
188 | |
189 | struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages) | |
190 | { | |
191 | return __fuse_get_req(fc, npages, false); | |
192 | } | |
08cbf542 | 193 | EXPORT_SYMBOL_GPL(fuse_get_req); |
334f485d | 194 | |
8b41e671 MP |
195 | struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, |
196 | unsigned npages) | |
197 | { | |
198 | return __fuse_get_req(fc, npages, true); | |
199 | } | |
200 | EXPORT_SYMBOL_GPL(fuse_get_req_for_background); | |
201 | ||
33649c91 MS |
202 | /* |
203 | * Return request in fuse_file->reserved_req. However that may | |
204 | * currently be in use. If that is the case, wait for it to become | |
205 | * available. | |
206 | */ | |
207 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, | |
208 | struct file *file) | |
209 | { | |
210 | struct fuse_req *req = NULL; | |
211 | struct fuse_file *ff = file->private_data; | |
212 | ||
213 | do { | |
de5e3dec | 214 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
33649c91 MS |
215 | spin_lock(&fc->lock); |
216 | if (ff->reserved_req) { | |
217 | req = ff->reserved_req; | |
218 | ff->reserved_req = NULL; | |
cb0942b8 | 219 | req->stolen_file = get_file(file); |
33649c91 MS |
220 | } |
221 | spin_unlock(&fc->lock); | |
222 | } while (!req); | |
223 | ||
224 | return req; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Put stolen request back into fuse_file->reserved_req | |
229 | */ | |
230 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) | |
231 | { | |
232 | struct file *file = req->stolen_file; | |
233 | struct fuse_file *ff = file->private_data; | |
234 | ||
235 | spin_lock(&fc->lock); | |
b2430d75 | 236 | fuse_request_init(req, req->pages, req->page_descs, req->max_pages); |
33649c91 MS |
237 | BUG_ON(ff->reserved_req); |
238 | ff->reserved_req = req; | |
de5e3dec | 239 | wake_up_all(&fc->reserved_req_waitq); |
33649c91 MS |
240 | spin_unlock(&fc->lock); |
241 | fput(file); | |
242 | } | |
243 | ||
244 | /* | |
245 | * Gets a requests for a file operation, always succeeds | |
246 | * | |
247 | * This is used for sending the FLUSH request, which must get to | |
248 | * userspace, due to POSIX locks which may need to be unlocked. | |
249 | * | |
250 | * If allocation fails due to OOM, use the reserved request in | |
251 | * fuse_file. | |
252 | * | |
253 | * This is very unlikely to deadlock accidentally, since the | |
254 | * filesystem should not have it's own file open. If deadlock is | |
255 | * intentional, it can still be broken by "aborting" the filesystem. | |
256 | */ | |
b111c8c0 MP |
257 | struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, |
258 | struct file *file) | |
33649c91 MS |
259 | { |
260 | struct fuse_req *req; | |
261 | ||
262 | atomic_inc(&fc->num_waiting); | |
0aada884 | 263 | wait_event(fc->blocked_waitq, fc->initialized); |
9759bd51 MS |
264 | /* Matches smp_wmb() in fuse_set_initialized() */ |
265 | smp_rmb(); | |
b111c8c0 | 266 | req = fuse_request_alloc(0); |
33649c91 MS |
267 | if (!req) |
268 | req = get_reserved_req(fc, file); | |
269 | ||
270 | fuse_req_init_context(req); | |
271 | req->waiting = 1; | |
8b41e671 | 272 | req->background = 0; |
33649c91 MS |
273 | return req; |
274 | } | |
275 | ||
334f485d | 276 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
7128ec2a MS |
277 | { |
278 | if (atomic_dec_and_test(&req->count)) { | |
722d2bea MP |
279 | if (unlikely(req->background)) { |
280 | /* | |
281 | * We get here in the unlikely case that a background | |
282 | * request was allocated but not sent | |
283 | */ | |
284 | spin_lock(&fc->lock); | |
285 | if (!fc->blocked) | |
286 | wake_up(&fc->blocked_waitq); | |
287 | spin_unlock(&fc->lock); | |
288 | } | |
289 | ||
9bc5ddda MS |
290 | if (req->waiting) |
291 | atomic_dec(&fc->num_waiting); | |
33649c91 MS |
292 | |
293 | if (req->stolen_file) | |
294 | put_reserved_req(fc, req); | |
295 | else | |
296 | fuse_request_free(req); | |
7128ec2a MS |
297 | } |
298 | } | |
08cbf542 | 299 | EXPORT_SYMBOL_GPL(fuse_put_request); |
7128ec2a | 300 | |
d12def1b MS |
301 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
302 | { | |
303 | unsigned nbytes = 0; | |
304 | unsigned i; | |
305 | ||
306 | for (i = 0; i < numargs; i++) | |
307 | nbytes += args[i].size; | |
308 | ||
309 | return nbytes; | |
310 | } | |
311 | ||
312 | static u64 fuse_get_unique(struct fuse_conn *fc) | |
313 | { | |
314 | fc->reqctr++; | |
315 | /* zero is special */ | |
316 | if (fc->reqctr == 0) | |
317 | fc->reqctr = 1; | |
318 | ||
319 | return fc->reqctr; | |
320 | } | |
321 | ||
322 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) | |
323 | { | |
d12def1b MS |
324 | req->in.h.len = sizeof(struct fuse_in_header) + |
325 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); | |
326 | list_add_tail(&req->list, &fc->pending); | |
327 | req->state = FUSE_REQ_PENDING; | |
328 | if (!req->waiting) { | |
329 | req->waiting = 1; | |
330 | atomic_inc(&fc->num_waiting); | |
331 | } | |
332 | wake_up(&fc->waitq); | |
333 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
334 | } | |
335 | ||
07e77dca MS |
336 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
337 | u64 nodeid, u64 nlookup) | |
338 | { | |
02c048b9 MS |
339 | forget->forget_one.nodeid = nodeid; |
340 | forget->forget_one.nlookup = nlookup; | |
07e77dca MS |
341 | |
342 | spin_lock(&fc->lock); | |
5dfcc87f MS |
343 | if (fc->connected) { |
344 | fc->forget_list_tail->next = forget; | |
345 | fc->forget_list_tail = forget; | |
346 | wake_up(&fc->waitq); | |
347 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
348 | } else { | |
349 | kfree(forget); | |
350 | } | |
07e77dca MS |
351 | spin_unlock(&fc->lock); |
352 | } | |
353 | ||
d12def1b MS |
354 | static void flush_bg_queue(struct fuse_conn *fc) |
355 | { | |
7a6d3c8b | 356 | while (fc->active_background < fc->max_background && |
d12def1b MS |
357 | !list_empty(&fc->bg_queue)) { |
358 | struct fuse_req *req; | |
359 | ||
360 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); | |
361 | list_del(&req->list); | |
362 | fc->active_background++; | |
2d45ba38 | 363 | req->in.h.unique = fuse_get_unique(fc); |
d12def1b MS |
364 | queue_request(fc, req); |
365 | } | |
366 | } | |
367 | ||
334f485d MS |
368 | /* |
369 | * This function is called when a request is finished. Either a reply | |
f9a2842e | 370 | * has arrived or it was aborted (and not yet sent) or some error |
f43b155a | 371 | * occurred during communication with userspace, or the device file |
51eb01e7 MS |
372 | * was closed. The requester thread is woken up (if still waiting), |
373 | * the 'end' callback is called if given, else the reference to the | |
374 | * request is released | |
7128ec2a | 375 | * |
d7133114 | 376 | * Called with fc->lock, unlocks it |
334f485d MS |
377 | */ |
378 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 | 379 | __releases(fc->lock) |
334f485d | 380 | { |
51eb01e7 MS |
381 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
382 | req->end = NULL; | |
d77a1d5b | 383 | list_del(&req->list); |
a4d27e75 | 384 | list_del(&req->intr_entry); |
83cfd493 | 385 | req->state = FUSE_REQ_FINISHED; |
51eb01e7 | 386 | if (req->background) { |
722d2bea MP |
387 | req->background = 0; |
388 | ||
389 | if (fc->num_background == fc->max_background) | |
51eb01e7 | 390 | fc->blocked = 0; |
722d2bea MP |
391 | |
392 | /* Wake up next waiter, if any */ | |
3c18ef81 | 393 | if (!fc->blocked && waitqueue_active(&fc->blocked_waitq)) |
722d2bea MP |
394 | wake_up(&fc->blocked_waitq); |
395 | ||
7a6d3c8b | 396 | if (fc->num_background == fc->congestion_threshold && |
a325f9b9 | 397 | fc->connected && fc->bdi_initialized) { |
8aa7e847 JA |
398 | clear_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
399 | clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC); | |
f92b99b9 | 400 | } |
51eb01e7 | 401 | fc->num_background--; |
d12def1b MS |
402 | fc->active_background--; |
403 | flush_bg_queue(fc); | |
334f485d | 404 | } |
51eb01e7 | 405 | spin_unlock(&fc->lock); |
51eb01e7 MS |
406 | wake_up(&req->waitq); |
407 | if (end) | |
408 | end(fc, req); | |
e9bb09dd | 409 | fuse_put_request(fc, req); |
334f485d MS |
410 | } |
411 | ||
a4d27e75 MS |
412 | static void wait_answer_interruptible(struct fuse_conn *fc, |
413 | struct fuse_req *req) | |
b9ca67b2 MS |
414 | __releases(fc->lock) |
415 | __acquires(fc->lock) | |
a4d27e75 MS |
416 | { |
417 | if (signal_pending(current)) | |
418 | return; | |
419 | ||
420 | spin_unlock(&fc->lock); | |
421 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); | |
422 | spin_lock(&fc->lock); | |
423 | } | |
424 | ||
425 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) | |
426 | { | |
427 | list_add_tail(&req->intr_entry, &fc->interrupts); | |
428 | wake_up(&fc->waitq); | |
429 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
430 | } | |
431 | ||
7c352bdf | 432 | static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) |
b9ca67b2 MS |
433 | __releases(fc->lock) |
434 | __acquires(fc->lock) | |
334f485d | 435 | { |
a4d27e75 MS |
436 | if (!fc->no_interrupt) { |
437 | /* Any signal may interrupt this */ | |
438 | wait_answer_interruptible(fc, req); | |
334f485d | 439 | |
a4d27e75 MS |
440 | if (req->aborted) |
441 | goto aborted; | |
442 | if (req->state == FUSE_REQ_FINISHED) | |
443 | return; | |
444 | ||
445 | req->interrupted = 1; | |
446 | if (req->state == FUSE_REQ_SENT) | |
447 | queue_interrupt(fc, req); | |
448 | } | |
449 | ||
a131de0a | 450 | if (!req->force) { |
a4d27e75 MS |
451 | sigset_t oldset; |
452 | ||
453 | /* Only fatal signals may interrupt this */ | |
51eb01e7 | 454 | block_sigs(&oldset); |
a4d27e75 | 455 | wait_answer_interruptible(fc, req); |
51eb01e7 | 456 | restore_sigs(&oldset); |
a131de0a MS |
457 | |
458 | if (req->aborted) | |
459 | goto aborted; | |
460 | if (req->state == FUSE_REQ_FINISHED) | |
461 | return; | |
462 | ||
463 | /* Request is not yet in userspace, bail out */ | |
464 | if (req->state == FUSE_REQ_PENDING) { | |
465 | list_del(&req->list); | |
466 | __fuse_put_request(req); | |
467 | req->out.h.error = -EINTR; | |
468 | return; | |
469 | } | |
51eb01e7 | 470 | } |
334f485d | 471 | |
a131de0a MS |
472 | /* |
473 | * Either request is already in userspace, or it was forced. | |
474 | * Wait it out. | |
475 | */ | |
476 | spin_unlock(&fc->lock); | |
477 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); | |
478 | spin_lock(&fc->lock); | |
a4d27e75 | 479 | |
a131de0a MS |
480 | if (!req->aborted) |
481 | return; | |
a4d27e75 MS |
482 | |
483 | aborted: | |
a131de0a | 484 | BUG_ON(req->state != FUSE_REQ_FINISHED); |
334f485d MS |
485 | if (req->locked) { |
486 | /* This is uninterruptible sleep, because data is | |
487 | being copied to/from the buffers of req. During | |
488 | locked state, there mustn't be any filesystem | |
489 | operation (e.g. page fault), since that could lead | |
490 | to deadlock */ | |
d7133114 | 491 | spin_unlock(&fc->lock); |
334f485d | 492 | wait_event(req->waitq, !req->locked); |
d7133114 | 493 | spin_lock(&fc->lock); |
334f485d | 494 | } |
334f485d MS |
495 | } |
496 | ||
6a4e922c | 497 | static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 498 | { |
8b41e671 | 499 | BUG_ON(req->background); |
d7133114 | 500 | spin_lock(&fc->lock); |
1e9a4ed9 | 501 | if (!fc->connected) |
334f485d MS |
502 | req->out.h.error = -ENOTCONN; |
503 | else if (fc->conn_error) | |
504 | req->out.h.error = -ECONNREFUSED; | |
505 | else { | |
2d45ba38 | 506 | req->in.h.unique = fuse_get_unique(fc); |
334f485d MS |
507 | queue_request(fc, req); |
508 | /* acquire extra reference, since request is still needed | |
509 | after request_end() */ | |
510 | __fuse_get_request(req); | |
511 | ||
7c352bdf | 512 | request_wait_answer(fc, req); |
334f485d | 513 | } |
d7133114 | 514 | spin_unlock(&fc->lock); |
334f485d | 515 | } |
6a4e922c EW |
516 | |
517 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) | |
518 | { | |
519 | req->isreply = 1; | |
520 | __fuse_request_send(fc, req); | |
521 | } | |
08cbf542 | 522 | EXPORT_SYMBOL_GPL(fuse_request_send); |
334f485d | 523 | |
21f62174 MS |
524 | static void fuse_adjust_compat(struct fuse_conn *fc, struct fuse_args *args) |
525 | { | |
526 | if (fc->minor < 4 && args->in.h.opcode == FUSE_STATFS) | |
527 | args->out.args[0].size = FUSE_COMPAT_STATFS_SIZE; | |
528 | ||
529 | if (fc->minor < 9) { | |
530 | switch (args->in.h.opcode) { | |
531 | case FUSE_LOOKUP: | |
532 | case FUSE_CREATE: | |
533 | case FUSE_MKNOD: | |
534 | case FUSE_MKDIR: | |
535 | case FUSE_SYMLINK: | |
536 | case FUSE_LINK: | |
537 | args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
538 | break; | |
539 | case FUSE_GETATTR: | |
540 | case FUSE_SETATTR: | |
541 | args->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
542 | break; | |
543 | } | |
544 | } | |
545 | if (fc->minor < 12) { | |
546 | switch (args->in.h.opcode) { | |
547 | case FUSE_CREATE: | |
548 | args->in.args[0].size = sizeof(struct fuse_open_in); | |
549 | break; | |
550 | case FUSE_MKNOD: | |
551 | args->in.args[0].size = FUSE_COMPAT_MKNOD_IN_SIZE; | |
552 | break; | |
553 | } | |
554 | } | |
555 | } | |
556 | ||
7078187a MS |
557 | ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args) |
558 | { | |
559 | struct fuse_req *req; | |
560 | ssize_t ret; | |
561 | ||
562 | req = fuse_get_req(fc, 0); | |
563 | if (IS_ERR(req)) | |
564 | return PTR_ERR(req); | |
565 | ||
21f62174 MS |
566 | /* Needs to be done after fuse_get_req() so that fc->minor is valid */ |
567 | fuse_adjust_compat(fc, args); | |
568 | ||
7078187a MS |
569 | req->in.h.opcode = args->in.h.opcode; |
570 | req->in.h.nodeid = args->in.h.nodeid; | |
571 | req->in.numargs = args->in.numargs; | |
572 | memcpy(req->in.args, args->in.args, | |
573 | args->in.numargs * sizeof(struct fuse_in_arg)); | |
574 | req->out.argvar = args->out.argvar; | |
575 | req->out.numargs = args->out.numargs; | |
576 | memcpy(req->out.args, args->out.args, | |
577 | args->out.numargs * sizeof(struct fuse_arg)); | |
578 | fuse_request_send(fc, req); | |
579 | ret = req->out.h.error; | |
580 | if (!ret && args->out.argvar) { | |
581 | BUG_ON(args->out.numargs != 1); | |
582 | ret = req->out.args[0].size; | |
583 | } | |
584 | fuse_put_request(fc, req); | |
585 | ||
586 | return ret; | |
587 | } | |
588 | ||
b93f858a TH |
589 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
590 | struct fuse_req *req) | |
d12def1b | 591 | { |
8b41e671 | 592 | BUG_ON(!req->background); |
d12def1b | 593 | fc->num_background++; |
7a6d3c8b | 594 | if (fc->num_background == fc->max_background) |
d12def1b | 595 | fc->blocked = 1; |
7a6d3c8b | 596 | if (fc->num_background == fc->congestion_threshold && |
a325f9b9 | 597 | fc->bdi_initialized) { |
8aa7e847 JA |
598 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
599 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); | |
d12def1b MS |
600 | } |
601 | list_add_tail(&req->list, &fc->bg_queue); | |
602 | flush_bg_queue(fc); | |
603 | } | |
604 | ||
b93f858a | 605 | static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 606 | { |
d7133114 | 607 | spin_lock(&fc->lock); |
1e9a4ed9 | 608 | if (fc->connected) { |
b93f858a | 609 | fuse_request_send_nowait_locked(fc, req); |
d7133114 | 610 | spin_unlock(&fc->lock); |
334f485d MS |
611 | } else { |
612 | req->out.h.error = -ENOTCONN; | |
613 | request_end(fc, req); | |
614 | } | |
615 | } | |
616 | ||
b93f858a | 617 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
618 | { |
619 | req->isreply = 1; | |
b93f858a | 620 | fuse_request_send_nowait(fc, req); |
334f485d | 621 | } |
08cbf542 | 622 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
334f485d | 623 | |
2d45ba38 MS |
624 | static int fuse_request_send_notify_reply(struct fuse_conn *fc, |
625 | struct fuse_req *req, u64 unique) | |
626 | { | |
627 | int err = -ENODEV; | |
628 | ||
629 | req->isreply = 0; | |
630 | req->in.h.unique = unique; | |
631 | spin_lock(&fc->lock); | |
632 | if (fc->connected) { | |
633 | queue_request(fc, req); | |
634 | err = 0; | |
635 | } | |
636 | spin_unlock(&fc->lock); | |
637 | ||
638 | return err; | |
639 | } | |
640 | ||
3be5a52b MS |
641 | /* |
642 | * Called under fc->lock | |
643 | * | |
644 | * fc->connected must have been checked previously | |
645 | */ | |
b93f858a TH |
646 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
647 | struct fuse_req *req) | |
3be5a52b MS |
648 | { |
649 | req->isreply = 1; | |
b93f858a | 650 | fuse_request_send_nowait_locked(fc, req); |
3be5a52b MS |
651 | } |
652 | ||
0b05b183 AA |
653 | void fuse_force_forget(struct file *file, u64 nodeid) |
654 | { | |
6131ffaa | 655 | struct inode *inode = file_inode(file); |
0b05b183 AA |
656 | struct fuse_conn *fc = get_fuse_conn(inode); |
657 | struct fuse_req *req; | |
658 | struct fuse_forget_in inarg; | |
659 | ||
660 | memset(&inarg, 0, sizeof(inarg)); | |
661 | inarg.nlookup = 1; | |
b111c8c0 | 662 | req = fuse_get_req_nofail_nopages(fc, file); |
0b05b183 AA |
663 | req->in.h.opcode = FUSE_FORGET; |
664 | req->in.h.nodeid = nodeid; | |
665 | req->in.numargs = 1; | |
666 | req->in.args[0].size = sizeof(inarg); | |
667 | req->in.args[0].value = &inarg; | |
668 | req->isreply = 0; | |
6a4e922c EW |
669 | __fuse_request_send(fc, req); |
670 | /* ignore errors */ | |
671 | fuse_put_request(fc, req); | |
0b05b183 AA |
672 | } |
673 | ||
334f485d MS |
674 | /* |
675 | * Lock the request. Up to the next unlock_request() there mustn't be | |
676 | * anything that could cause a page-fault. If the request was already | |
f9a2842e | 677 | * aborted bail out. |
334f485d | 678 | */ |
d7133114 | 679 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
680 | { |
681 | int err = 0; | |
682 | if (req) { | |
d7133114 | 683 | spin_lock(&fc->lock); |
f9a2842e | 684 | if (req->aborted) |
334f485d MS |
685 | err = -ENOENT; |
686 | else | |
687 | req->locked = 1; | |
d7133114 | 688 | spin_unlock(&fc->lock); |
334f485d MS |
689 | } |
690 | return err; | |
691 | } | |
692 | ||
693 | /* | |
f9a2842e | 694 | * Unlock request. If it was aborted during being locked, the |
334f485d MS |
695 | * requester thread is currently waiting for it to be unlocked, so |
696 | * wake it up. | |
697 | */ | |
d7133114 | 698 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
334f485d MS |
699 | { |
700 | if (req) { | |
d7133114 | 701 | spin_lock(&fc->lock); |
334f485d | 702 | req->locked = 0; |
f9a2842e | 703 | if (req->aborted) |
334f485d | 704 | wake_up(&req->waitq); |
d7133114 | 705 | spin_unlock(&fc->lock); |
334f485d MS |
706 | } |
707 | } | |
708 | ||
709 | struct fuse_copy_state { | |
d7133114 | 710 | struct fuse_conn *fc; |
334f485d MS |
711 | int write; |
712 | struct fuse_req *req; | |
6c09e94a | 713 | struct iov_iter *iter; |
dd3bb14f MS |
714 | struct pipe_buffer *pipebufs; |
715 | struct pipe_buffer *currbuf; | |
716 | struct pipe_inode_info *pipe; | |
334f485d | 717 | unsigned long nr_segs; |
334f485d | 718 | struct page *pg; |
334f485d | 719 | unsigned len; |
c55a01d3 | 720 | unsigned offset; |
ce534fb0 | 721 | unsigned move_pages:1; |
334f485d MS |
722 | }; |
723 | ||
6c09e94a AV |
724 | static void fuse_copy_init(struct fuse_copy_state *cs, |
725 | struct fuse_conn *fc, | |
c3021629 | 726 | int write, |
6c09e94a | 727 | struct iov_iter *iter) |
334f485d MS |
728 | { |
729 | memset(cs, 0, sizeof(*cs)); | |
d7133114 | 730 | cs->fc = fc; |
334f485d | 731 | cs->write = write; |
6c09e94a | 732 | cs->iter = iter; |
334f485d MS |
733 | } |
734 | ||
735 | /* Unmap and put previous page of userspace buffer */ | |
8bfc016d | 736 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
334f485d | 737 | { |
dd3bb14f MS |
738 | if (cs->currbuf) { |
739 | struct pipe_buffer *buf = cs->currbuf; | |
740 | ||
c55a01d3 | 741 | if (cs->write) |
c3021629 | 742 | buf->len = PAGE_SIZE - cs->len; |
dd3bb14f | 743 | cs->currbuf = NULL; |
c55a01d3 | 744 | } else if (cs->pg) { |
334f485d MS |
745 | if (cs->write) { |
746 | flush_dcache_page(cs->pg); | |
747 | set_page_dirty_lock(cs->pg); | |
748 | } | |
749 | put_page(cs->pg); | |
334f485d | 750 | } |
c55a01d3 | 751 | cs->pg = NULL; |
334f485d MS |
752 | } |
753 | ||
754 | /* | |
755 | * Get another pagefull of userspace buffer, and map it to kernel | |
756 | * address space, and lock request | |
757 | */ | |
758 | static int fuse_copy_fill(struct fuse_copy_state *cs) | |
759 | { | |
c55a01d3 | 760 | struct page *page; |
334f485d MS |
761 | int err; |
762 | ||
d7133114 | 763 | unlock_request(cs->fc, cs->req); |
334f485d | 764 | fuse_copy_finish(cs); |
dd3bb14f MS |
765 | if (cs->pipebufs) { |
766 | struct pipe_buffer *buf = cs->pipebufs; | |
767 | ||
c3021629 MS |
768 | if (!cs->write) { |
769 | err = buf->ops->confirm(cs->pipe, buf); | |
770 | if (err) | |
771 | return err; | |
772 | ||
773 | BUG_ON(!cs->nr_segs); | |
774 | cs->currbuf = buf; | |
c55a01d3 MS |
775 | cs->pg = buf->page; |
776 | cs->offset = buf->offset; | |
c3021629 | 777 | cs->len = buf->len; |
c3021629 MS |
778 | cs->pipebufs++; |
779 | cs->nr_segs--; | |
780 | } else { | |
c3021629 MS |
781 | if (cs->nr_segs == cs->pipe->buffers) |
782 | return -EIO; | |
783 | ||
784 | page = alloc_page(GFP_HIGHUSER); | |
785 | if (!page) | |
786 | return -ENOMEM; | |
787 | ||
788 | buf->page = page; | |
789 | buf->offset = 0; | |
790 | buf->len = 0; | |
791 | ||
792 | cs->currbuf = buf; | |
c55a01d3 MS |
793 | cs->pg = page; |
794 | cs->offset = 0; | |
c3021629 MS |
795 | cs->len = PAGE_SIZE; |
796 | cs->pipebufs++; | |
797 | cs->nr_segs++; | |
798 | } | |
dd3bb14f | 799 | } else { |
6c09e94a AV |
800 | size_t off; |
801 | err = iov_iter_get_pages(cs->iter, &page, PAGE_SIZE, 1, &off); | |
dd3bb14f MS |
802 | if (err < 0) |
803 | return err; | |
6c09e94a AV |
804 | BUG_ON(!err); |
805 | cs->len = err; | |
806 | cs->offset = off; | |
c55a01d3 | 807 | cs->pg = page; |
6c09e94a AV |
808 | cs->offset = off; |
809 | iov_iter_advance(cs->iter, err); | |
334f485d | 810 | } |
334f485d | 811 | |
d7133114 | 812 | return lock_request(cs->fc, cs->req); |
334f485d MS |
813 | } |
814 | ||
815 | /* Do as much copy to/from userspace buffer as we can */ | |
8bfc016d | 816 | static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size) |
334f485d MS |
817 | { |
818 | unsigned ncpy = min(*size, cs->len); | |
819 | if (val) { | |
c55a01d3 MS |
820 | void *pgaddr = kmap_atomic(cs->pg); |
821 | void *buf = pgaddr + cs->offset; | |
822 | ||
334f485d | 823 | if (cs->write) |
c55a01d3 | 824 | memcpy(buf, *val, ncpy); |
334f485d | 825 | else |
c55a01d3 MS |
826 | memcpy(*val, buf, ncpy); |
827 | ||
828 | kunmap_atomic(pgaddr); | |
334f485d MS |
829 | *val += ncpy; |
830 | } | |
831 | *size -= ncpy; | |
832 | cs->len -= ncpy; | |
c55a01d3 | 833 | cs->offset += ncpy; |
334f485d MS |
834 | return ncpy; |
835 | } | |
836 | ||
ce534fb0 MS |
837 | static int fuse_check_page(struct page *page) |
838 | { | |
839 | if (page_mapcount(page) || | |
840 | page->mapping != NULL || | |
841 | page_count(page) != 1 || | |
842 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & | |
843 | ~(1 << PG_locked | | |
844 | 1 << PG_referenced | | |
845 | 1 << PG_uptodate | | |
846 | 1 << PG_lru | | |
847 | 1 << PG_active | | |
848 | 1 << PG_reclaim))) { | |
849 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); | |
850 | 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); | |
851 | return 1; | |
852 | } | |
853 | return 0; | |
854 | } | |
855 | ||
856 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) | |
857 | { | |
858 | int err; | |
859 | struct page *oldpage = *pagep; | |
860 | struct page *newpage; | |
861 | struct pipe_buffer *buf = cs->pipebufs; | |
ce534fb0 MS |
862 | |
863 | unlock_request(cs->fc, cs->req); | |
864 | fuse_copy_finish(cs); | |
865 | ||
866 | err = buf->ops->confirm(cs->pipe, buf); | |
867 | if (err) | |
868 | return err; | |
869 | ||
870 | BUG_ON(!cs->nr_segs); | |
871 | cs->currbuf = buf; | |
872 | cs->len = buf->len; | |
873 | cs->pipebufs++; | |
874 | cs->nr_segs--; | |
875 | ||
876 | if (cs->len != PAGE_SIZE) | |
877 | goto out_fallback; | |
878 | ||
879 | if (buf->ops->steal(cs->pipe, buf) != 0) | |
880 | goto out_fallback; | |
881 | ||
882 | newpage = buf->page; | |
883 | ||
aa991b3b MS |
884 | if (!PageUptodate(newpage)) |
885 | SetPageUptodate(newpage); | |
ce534fb0 MS |
886 | |
887 | ClearPageMappedToDisk(newpage); | |
888 | ||
889 | if (fuse_check_page(newpage) != 0) | |
890 | goto out_fallback_unlock; | |
891 | ||
ce534fb0 MS |
892 | /* |
893 | * This is a new and locked page, it shouldn't be mapped or | |
894 | * have any special flags on it | |
895 | */ | |
896 | if (WARN_ON(page_mapped(oldpage))) | |
897 | goto out_fallback_unlock; | |
898 | if (WARN_ON(page_has_private(oldpage))) | |
899 | goto out_fallback_unlock; | |
900 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) | |
901 | goto out_fallback_unlock; | |
902 | if (WARN_ON(PageMlocked(oldpage))) | |
903 | goto out_fallback_unlock; | |
904 | ||
ef6a3c63 | 905 | err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL); |
ce534fb0 | 906 | if (err) { |
ef6a3c63 MS |
907 | unlock_page(newpage); |
908 | return err; | |
ce534fb0 | 909 | } |
ef6a3c63 | 910 | |
ce534fb0 MS |
911 | page_cache_get(newpage); |
912 | ||
913 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) | |
914 | lru_cache_add_file(newpage); | |
915 | ||
916 | err = 0; | |
917 | spin_lock(&cs->fc->lock); | |
918 | if (cs->req->aborted) | |
919 | err = -ENOENT; | |
920 | else | |
921 | *pagep = newpage; | |
922 | spin_unlock(&cs->fc->lock); | |
923 | ||
924 | if (err) { | |
925 | unlock_page(newpage); | |
926 | page_cache_release(newpage); | |
927 | return err; | |
928 | } | |
929 | ||
930 | unlock_page(oldpage); | |
931 | page_cache_release(oldpage); | |
932 | cs->len = 0; | |
933 | ||
934 | return 0; | |
935 | ||
936 | out_fallback_unlock: | |
937 | unlock_page(newpage); | |
938 | out_fallback: | |
c55a01d3 MS |
939 | cs->pg = buf->page; |
940 | cs->offset = buf->offset; | |
ce534fb0 MS |
941 | |
942 | err = lock_request(cs->fc, cs->req); | |
943 | if (err) | |
944 | return err; | |
945 | ||
946 | return 1; | |
947 | } | |
948 | ||
c3021629 MS |
949 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
950 | unsigned offset, unsigned count) | |
951 | { | |
952 | struct pipe_buffer *buf; | |
953 | ||
954 | if (cs->nr_segs == cs->pipe->buffers) | |
955 | return -EIO; | |
956 | ||
957 | unlock_request(cs->fc, cs->req); | |
958 | fuse_copy_finish(cs); | |
959 | ||
960 | buf = cs->pipebufs; | |
961 | page_cache_get(page); | |
962 | buf->page = page; | |
963 | buf->offset = offset; | |
964 | buf->len = count; | |
965 | ||
966 | cs->pipebufs++; | |
967 | cs->nr_segs++; | |
968 | cs->len = 0; | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
334f485d MS |
973 | /* |
974 | * Copy a page in the request to/from the userspace buffer. Must be | |
975 | * done atomically | |
976 | */ | |
ce534fb0 | 977 | static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep, |
8bfc016d | 978 | unsigned offset, unsigned count, int zeroing) |
334f485d | 979 | { |
ce534fb0 MS |
980 | int err; |
981 | struct page *page = *pagep; | |
982 | ||
b6777c40 MS |
983 | if (page && zeroing && count < PAGE_SIZE) |
984 | clear_highpage(page); | |
985 | ||
334f485d | 986 | while (count) { |
c3021629 MS |
987 | if (cs->write && cs->pipebufs && page) { |
988 | return fuse_ref_page(cs, page, offset, count); | |
989 | } else if (!cs->len) { | |
ce534fb0 MS |
990 | if (cs->move_pages && page && |
991 | offset == 0 && count == PAGE_SIZE) { | |
992 | err = fuse_try_move_page(cs, pagep); | |
993 | if (err <= 0) | |
994 | return err; | |
995 | } else { | |
996 | err = fuse_copy_fill(cs); | |
997 | if (err) | |
998 | return err; | |
999 | } | |
1729a16c | 1000 | } |
334f485d | 1001 | if (page) { |
2408f6ef | 1002 | void *mapaddr = kmap_atomic(page); |
334f485d MS |
1003 | void *buf = mapaddr + offset; |
1004 | offset += fuse_copy_do(cs, &buf, &count); | |
2408f6ef | 1005 | kunmap_atomic(mapaddr); |
334f485d MS |
1006 | } else |
1007 | offset += fuse_copy_do(cs, NULL, &count); | |
1008 | } | |
1009 | if (page && !cs->write) | |
1010 | flush_dcache_page(page); | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | /* Copy pages in the request to/from userspace buffer */ | |
1015 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, | |
1016 | int zeroing) | |
1017 | { | |
1018 | unsigned i; | |
1019 | struct fuse_req *req = cs->req; | |
334f485d MS |
1020 | |
1021 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { | |
ce534fb0 | 1022 | int err; |
85f40aec MP |
1023 | unsigned offset = req->page_descs[i].offset; |
1024 | unsigned count = min(nbytes, req->page_descs[i].length); | |
ce534fb0 MS |
1025 | |
1026 | err = fuse_copy_page(cs, &req->pages[i], offset, count, | |
1027 | zeroing); | |
334f485d MS |
1028 | if (err) |
1029 | return err; | |
1030 | ||
1031 | nbytes -= count; | |
334f485d MS |
1032 | } |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | /* Copy a single argument in the request to/from userspace buffer */ | |
1037 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) | |
1038 | { | |
1039 | while (size) { | |
1729a16c MS |
1040 | if (!cs->len) { |
1041 | int err = fuse_copy_fill(cs); | |
1042 | if (err) | |
1043 | return err; | |
1044 | } | |
334f485d MS |
1045 | fuse_copy_do(cs, &val, &size); |
1046 | } | |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | /* Copy request arguments to/from userspace buffer */ | |
1051 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, | |
1052 | unsigned argpages, struct fuse_arg *args, | |
1053 | int zeroing) | |
1054 | { | |
1055 | int err = 0; | |
1056 | unsigned i; | |
1057 | ||
1058 | for (i = 0; !err && i < numargs; i++) { | |
1059 | struct fuse_arg *arg = &args[i]; | |
1060 | if (i == numargs - 1 && argpages) | |
1061 | err = fuse_copy_pages(cs, arg->size, zeroing); | |
1062 | else | |
1063 | err = fuse_copy_one(cs, arg->value, arg->size); | |
1064 | } | |
1065 | return err; | |
1066 | } | |
1067 | ||
07e77dca MS |
1068 | static int forget_pending(struct fuse_conn *fc) |
1069 | { | |
1070 | return fc->forget_list_head.next != NULL; | |
1071 | } | |
1072 | ||
a4d27e75 MS |
1073 | static int request_pending(struct fuse_conn *fc) |
1074 | { | |
07e77dca MS |
1075 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) || |
1076 | forget_pending(fc); | |
a4d27e75 MS |
1077 | } |
1078 | ||
334f485d MS |
1079 | /* Wait until a request is available on the pending list */ |
1080 | static void request_wait(struct fuse_conn *fc) | |
b9ca67b2 MS |
1081 | __releases(fc->lock) |
1082 | __acquires(fc->lock) | |
334f485d MS |
1083 | { |
1084 | DECLARE_WAITQUEUE(wait, current); | |
1085 | ||
1086 | add_wait_queue_exclusive(&fc->waitq, &wait); | |
a4d27e75 | 1087 | while (fc->connected && !request_pending(fc)) { |
334f485d MS |
1088 | set_current_state(TASK_INTERRUPTIBLE); |
1089 | if (signal_pending(current)) | |
1090 | break; | |
1091 | ||
d7133114 | 1092 | spin_unlock(&fc->lock); |
334f485d | 1093 | schedule(); |
d7133114 | 1094 | spin_lock(&fc->lock); |
334f485d MS |
1095 | } |
1096 | set_current_state(TASK_RUNNING); | |
1097 | remove_wait_queue(&fc->waitq, &wait); | |
1098 | } | |
1099 | ||
a4d27e75 MS |
1100 | /* |
1101 | * Transfer an interrupt request to userspace | |
1102 | * | |
1103 | * Unlike other requests this is assembled on demand, without a need | |
1104 | * to allocate a separate fuse_req structure. | |
1105 | * | |
1106 | * Called with fc->lock held, releases it | |
1107 | */ | |
c3021629 MS |
1108 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs, |
1109 | size_t nbytes, struct fuse_req *req) | |
b9ca67b2 | 1110 | __releases(fc->lock) |
a4d27e75 | 1111 | { |
a4d27e75 MS |
1112 | struct fuse_in_header ih; |
1113 | struct fuse_interrupt_in arg; | |
1114 | unsigned reqsize = sizeof(ih) + sizeof(arg); | |
1115 | int err; | |
1116 | ||
1117 | list_del_init(&req->intr_entry); | |
1118 | req->intr_unique = fuse_get_unique(fc); | |
1119 | memset(&ih, 0, sizeof(ih)); | |
1120 | memset(&arg, 0, sizeof(arg)); | |
1121 | ih.len = reqsize; | |
1122 | ih.opcode = FUSE_INTERRUPT; | |
1123 | ih.unique = req->intr_unique; | |
1124 | arg.unique = req->in.h.unique; | |
1125 | ||
1126 | spin_unlock(&fc->lock); | |
c3021629 | 1127 | if (nbytes < reqsize) |
a4d27e75 MS |
1128 | return -EINVAL; |
1129 | ||
c3021629 | 1130 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
a4d27e75 | 1131 | if (!err) |
c3021629 MS |
1132 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
1133 | fuse_copy_finish(cs); | |
a4d27e75 MS |
1134 | |
1135 | return err ? err : reqsize; | |
1136 | } | |
1137 | ||
02c048b9 MS |
1138 | static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc, |
1139 | unsigned max, | |
1140 | unsigned *countp) | |
07e77dca | 1141 | { |
02c048b9 MS |
1142 | struct fuse_forget_link *head = fc->forget_list_head.next; |
1143 | struct fuse_forget_link **newhead = &head; | |
1144 | unsigned count; | |
07e77dca | 1145 | |
02c048b9 MS |
1146 | for (count = 0; *newhead != NULL && count < max; count++) |
1147 | newhead = &(*newhead)->next; | |
1148 | ||
1149 | fc->forget_list_head.next = *newhead; | |
1150 | *newhead = NULL; | |
07e77dca MS |
1151 | if (fc->forget_list_head.next == NULL) |
1152 | fc->forget_list_tail = &fc->forget_list_head; | |
1153 | ||
02c048b9 MS |
1154 | if (countp != NULL) |
1155 | *countp = count; | |
1156 | ||
1157 | return head; | |
07e77dca MS |
1158 | } |
1159 | ||
1160 | static int fuse_read_single_forget(struct fuse_conn *fc, | |
1161 | struct fuse_copy_state *cs, | |
1162 | size_t nbytes) | |
1163 | __releases(fc->lock) | |
1164 | { | |
1165 | int err; | |
02c048b9 | 1166 | struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL); |
07e77dca | 1167 | struct fuse_forget_in arg = { |
02c048b9 | 1168 | .nlookup = forget->forget_one.nlookup, |
07e77dca MS |
1169 | }; |
1170 | struct fuse_in_header ih = { | |
1171 | .opcode = FUSE_FORGET, | |
02c048b9 | 1172 | .nodeid = forget->forget_one.nodeid, |
07e77dca MS |
1173 | .unique = fuse_get_unique(fc), |
1174 | .len = sizeof(ih) + sizeof(arg), | |
1175 | }; | |
1176 | ||
1177 | spin_unlock(&fc->lock); | |
1178 | kfree(forget); | |
1179 | if (nbytes < ih.len) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1183 | if (!err) | |
1184 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1185 | fuse_copy_finish(cs); | |
1186 | ||
1187 | if (err) | |
1188 | return err; | |
1189 | ||
1190 | return ih.len; | |
1191 | } | |
1192 | ||
02c048b9 MS |
1193 | static int fuse_read_batch_forget(struct fuse_conn *fc, |
1194 | struct fuse_copy_state *cs, size_t nbytes) | |
1195 | __releases(fc->lock) | |
1196 | { | |
1197 | int err; | |
1198 | unsigned max_forgets; | |
1199 | unsigned count; | |
1200 | struct fuse_forget_link *head; | |
1201 | struct fuse_batch_forget_in arg = { .count = 0 }; | |
1202 | struct fuse_in_header ih = { | |
1203 | .opcode = FUSE_BATCH_FORGET, | |
1204 | .unique = fuse_get_unique(fc), | |
1205 | .len = sizeof(ih) + sizeof(arg), | |
1206 | }; | |
1207 | ||
1208 | if (nbytes < ih.len) { | |
1209 | spin_unlock(&fc->lock); | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | ||
1213 | max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one); | |
1214 | head = dequeue_forget(fc, max_forgets, &count); | |
1215 | spin_unlock(&fc->lock); | |
1216 | ||
1217 | arg.count = count; | |
1218 | ih.len += count * sizeof(struct fuse_forget_one); | |
1219 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1220 | if (!err) | |
1221 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1222 | ||
1223 | while (head) { | |
1224 | struct fuse_forget_link *forget = head; | |
1225 | ||
1226 | if (!err) { | |
1227 | err = fuse_copy_one(cs, &forget->forget_one, | |
1228 | sizeof(forget->forget_one)); | |
1229 | } | |
1230 | head = forget->next; | |
1231 | kfree(forget); | |
1232 | } | |
1233 | ||
1234 | fuse_copy_finish(cs); | |
1235 | ||
1236 | if (err) | |
1237 | return err; | |
1238 | ||
1239 | return ih.len; | |
1240 | } | |
1241 | ||
1242 | static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs, | |
1243 | size_t nbytes) | |
1244 | __releases(fc->lock) | |
1245 | { | |
1246 | if (fc->minor < 16 || fc->forget_list_head.next->next == NULL) | |
1247 | return fuse_read_single_forget(fc, cs, nbytes); | |
1248 | else | |
1249 | return fuse_read_batch_forget(fc, cs, nbytes); | |
1250 | } | |
1251 | ||
334f485d MS |
1252 | /* |
1253 | * Read a single request into the userspace filesystem's buffer. This | |
1254 | * function waits until a request is available, then removes it from | |
1255 | * the pending list and copies request data to userspace buffer. If | |
f9a2842e MS |
1256 | * no reply is needed (FORGET) or request has been aborted or there |
1257 | * was an error during the copying then it's finished by calling | |
334f485d MS |
1258 | * request_end(). Otherwise add it to the processing list, and set |
1259 | * the 'sent' flag. | |
1260 | */ | |
c3021629 MS |
1261 | static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, |
1262 | struct fuse_copy_state *cs, size_t nbytes) | |
334f485d MS |
1263 | { |
1264 | int err; | |
334f485d MS |
1265 | struct fuse_req *req; |
1266 | struct fuse_in *in; | |
334f485d MS |
1267 | unsigned reqsize; |
1268 | ||
1d3d752b | 1269 | restart: |
d7133114 | 1270 | spin_lock(&fc->lock); |
e5ac1d1e JD |
1271 | err = -EAGAIN; |
1272 | if ((file->f_flags & O_NONBLOCK) && fc->connected && | |
a4d27e75 | 1273 | !request_pending(fc)) |
e5ac1d1e JD |
1274 | goto err_unlock; |
1275 | ||
334f485d MS |
1276 | request_wait(fc); |
1277 | err = -ENODEV; | |
9ba7cbba | 1278 | if (!fc->connected) |
334f485d MS |
1279 | goto err_unlock; |
1280 | err = -ERESTARTSYS; | |
a4d27e75 | 1281 | if (!request_pending(fc)) |
334f485d MS |
1282 | goto err_unlock; |
1283 | ||
a4d27e75 MS |
1284 | if (!list_empty(&fc->interrupts)) { |
1285 | req = list_entry(fc->interrupts.next, struct fuse_req, | |
1286 | intr_entry); | |
c3021629 | 1287 | return fuse_read_interrupt(fc, cs, nbytes, req); |
a4d27e75 MS |
1288 | } |
1289 | ||
07e77dca MS |
1290 | if (forget_pending(fc)) { |
1291 | if (list_empty(&fc->pending) || fc->forget_batch-- > 0) | |
02c048b9 | 1292 | return fuse_read_forget(fc, cs, nbytes); |
07e77dca MS |
1293 | |
1294 | if (fc->forget_batch <= -8) | |
1295 | fc->forget_batch = 16; | |
1296 | } | |
1297 | ||
334f485d | 1298 | req = list_entry(fc->pending.next, struct fuse_req, list); |
83cfd493 | 1299 | req->state = FUSE_REQ_READING; |
d77a1d5b | 1300 | list_move(&req->list, &fc->io); |
334f485d MS |
1301 | |
1302 | in = &req->in; | |
1d3d752b MS |
1303 | reqsize = in->h.len; |
1304 | /* If request is too large, reply with an error and restart the read */ | |
c3021629 | 1305 | if (nbytes < reqsize) { |
1d3d752b MS |
1306 | req->out.h.error = -EIO; |
1307 | /* SETXATTR is special, since it may contain too large data */ | |
1308 | if (in->h.opcode == FUSE_SETXATTR) | |
1309 | req->out.h.error = -E2BIG; | |
1310 | request_end(fc, req); | |
1311 | goto restart; | |
334f485d | 1312 | } |
d7133114 | 1313 | spin_unlock(&fc->lock); |
c3021629 MS |
1314 | cs->req = req; |
1315 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); | |
1d3d752b | 1316 | if (!err) |
c3021629 | 1317 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
1d3d752b | 1318 | (struct fuse_arg *) in->args, 0); |
c3021629 | 1319 | fuse_copy_finish(cs); |
d7133114 | 1320 | spin_lock(&fc->lock); |
334f485d | 1321 | req->locked = 0; |
c9c9d7df MS |
1322 | if (req->aborted) { |
1323 | request_end(fc, req); | |
1324 | return -ENODEV; | |
1325 | } | |
334f485d | 1326 | if (err) { |
c9c9d7df | 1327 | req->out.h.error = -EIO; |
334f485d MS |
1328 | request_end(fc, req); |
1329 | return err; | |
1330 | } | |
1331 | if (!req->isreply) | |
1332 | request_end(fc, req); | |
1333 | else { | |
83cfd493 | 1334 | req->state = FUSE_REQ_SENT; |
d77a1d5b | 1335 | list_move_tail(&req->list, &fc->processing); |
a4d27e75 MS |
1336 | if (req->interrupted) |
1337 | queue_interrupt(fc, req); | |
d7133114 | 1338 | spin_unlock(&fc->lock); |
334f485d MS |
1339 | } |
1340 | return reqsize; | |
1341 | ||
1342 | err_unlock: | |
d7133114 | 1343 | spin_unlock(&fc->lock); |
334f485d MS |
1344 | return err; |
1345 | } | |
1346 | ||
94e4fe2c TVB |
1347 | static int fuse_dev_open(struct inode *inode, struct file *file) |
1348 | { | |
1349 | /* | |
1350 | * The fuse device's file's private_data is used to hold | |
1351 | * the fuse_conn(ection) when it is mounted, and is used to | |
1352 | * keep track of whether the file has been mounted already. | |
1353 | */ | |
1354 | file->private_data = NULL; | |
1355 | return 0; | |
1356 | } | |
1357 | ||
fbdbacca | 1358 | static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to) |
c3021629 MS |
1359 | { |
1360 | struct fuse_copy_state cs; | |
1361 | struct file *file = iocb->ki_filp; | |
1362 | struct fuse_conn *fc = fuse_get_conn(file); | |
1363 | if (!fc) | |
1364 | return -EPERM; | |
1365 | ||
fbdbacca AV |
1366 | if (!iter_is_iovec(to)) |
1367 | return -EINVAL; | |
1368 | ||
6c09e94a | 1369 | fuse_copy_init(&cs, fc, 1, to); |
c3021629 | 1370 | |
fbdbacca | 1371 | return fuse_dev_do_read(fc, file, &cs, iov_iter_count(to)); |
c3021629 MS |
1372 | } |
1373 | ||
c3021629 MS |
1374 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, |
1375 | struct pipe_inode_info *pipe, | |
1376 | size_t len, unsigned int flags) | |
1377 | { | |
1378 | int ret; | |
1379 | int page_nr = 0; | |
1380 | int do_wakeup = 0; | |
1381 | struct pipe_buffer *bufs; | |
1382 | struct fuse_copy_state cs; | |
1383 | struct fuse_conn *fc = fuse_get_conn(in); | |
1384 | if (!fc) | |
1385 | return -EPERM; | |
1386 | ||
07e77dca | 1387 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
c3021629 MS |
1388 | if (!bufs) |
1389 | return -ENOMEM; | |
1390 | ||
6c09e94a | 1391 | fuse_copy_init(&cs, fc, 1, NULL); |
c3021629 MS |
1392 | cs.pipebufs = bufs; |
1393 | cs.pipe = pipe; | |
1394 | ret = fuse_dev_do_read(fc, in, &cs, len); | |
1395 | if (ret < 0) | |
1396 | goto out; | |
1397 | ||
1398 | ret = 0; | |
1399 | pipe_lock(pipe); | |
1400 | ||
1401 | if (!pipe->readers) { | |
1402 | send_sig(SIGPIPE, current, 0); | |
1403 | if (!ret) | |
1404 | ret = -EPIPE; | |
1405 | goto out_unlock; | |
1406 | } | |
1407 | ||
1408 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { | |
1409 | ret = -EIO; | |
1410 | goto out_unlock; | |
1411 | } | |
1412 | ||
1413 | while (page_nr < cs.nr_segs) { | |
1414 | int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); | |
1415 | struct pipe_buffer *buf = pipe->bufs + newbuf; | |
1416 | ||
1417 | buf->page = bufs[page_nr].page; | |
1418 | buf->offset = bufs[page_nr].offset; | |
1419 | buf->len = bufs[page_nr].len; | |
28a625cb MS |
1420 | /* |
1421 | * Need to be careful about this. Having buf->ops in module | |
1422 | * code can Oops if the buffer persists after module unload. | |
1423 | */ | |
1424 | buf->ops = &nosteal_pipe_buf_ops; | |
c3021629 MS |
1425 | |
1426 | pipe->nrbufs++; | |
1427 | page_nr++; | |
1428 | ret += buf->len; | |
1429 | ||
6447a3cf | 1430 | if (pipe->files) |
c3021629 MS |
1431 | do_wakeup = 1; |
1432 | } | |
1433 | ||
1434 | out_unlock: | |
1435 | pipe_unlock(pipe); | |
1436 | ||
1437 | if (do_wakeup) { | |
1438 | smp_mb(); | |
1439 | if (waitqueue_active(&pipe->wait)) | |
1440 | wake_up_interruptible(&pipe->wait); | |
1441 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); | |
1442 | } | |
1443 | ||
1444 | out: | |
1445 | for (; page_nr < cs.nr_segs; page_nr++) | |
1446 | page_cache_release(bufs[page_nr].page); | |
1447 | ||
1448 | kfree(bufs); | |
1449 | return ret; | |
1450 | } | |
1451 | ||
95668a69 TH |
1452 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
1453 | struct fuse_copy_state *cs) | |
1454 | { | |
1455 | struct fuse_notify_poll_wakeup_out outarg; | |
f6d47a17 | 1456 | int err = -EINVAL; |
95668a69 TH |
1457 | |
1458 | if (size != sizeof(outarg)) | |
f6d47a17 | 1459 | goto err; |
95668a69 TH |
1460 | |
1461 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1462 | if (err) | |
f6d47a17 | 1463 | goto err; |
95668a69 | 1464 | |
f6d47a17 | 1465 | fuse_copy_finish(cs); |
95668a69 | 1466 | return fuse_notify_poll_wakeup(fc, &outarg); |
f6d47a17 MS |
1467 | |
1468 | err: | |
1469 | fuse_copy_finish(cs); | |
1470 | return err; | |
95668a69 TH |
1471 | } |
1472 | ||
3b463ae0 JM |
1473 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
1474 | struct fuse_copy_state *cs) | |
1475 | { | |
1476 | struct fuse_notify_inval_inode_out outarg; | |
1477 | int err = -EINVAL; | |
1478 | ||
1479 | if (size != sizeof(outarg)) | |
1480 | goto err; | |
1481 | ||
1482 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1483 | if (err) | |
1484 | goto err; | |
1485 | fuse_copy_finish(cs); | |
1486 | ||
1487 | down_read(&fc->killsb); | |
1488 | err = -ENOENT; | |
b21dda43 MS |
1489 | if (fc->sb) { |
1490 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, | |
1491 | outarg.off, outarg.len); | |
1492 | } | |
3b463ae0 JM |
1493 | up_read(&fc->killsb); |
1494 | return err; | |
1495 | ||
1496 | err: | |
1497 | fuse_copy_finish(cs); | |
1498 | return err; | |
1499 | } | |
1500 | ||
1501 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, | |
1502 | struct fuse_copy_state *cs) | |
1503 | { | |
1504 | struct fuse_notify_inval_entry_out outarg; | |
b2d82ee3 FW |
1505 | int err = -ENOMEM; |
1506 | char *buf; | |
3b463ae0 JM |
1507 | struct qstr name; |
1508 | ||
b2d82ee3 FW |
1509 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
1510 | if (!buf) | |
1511 | goto err; | |
1512 | ||
1513 | err = -EINVAL; | |
3b463ae0 JM |
1514 | if (size < sizeof(outarg)) |
1515 | goto err; | |
1516 | ||
1517 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1518 | if (err) | |
1519 | goto err; | |
1520 | ||
1521 | err = -ENAMETOOLONG; | |
1522 | if (outarg.namelen > FUSE_NAME_MAX) | |
1523 | goto err; | |
1524 | ||
c2183d1e MS |
1525 | err = -EINVAL; |
1526 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1527 | goto err; | |
1528 | ||
3b463ae0 JM |
1529 | name.name = buf; |
1530 | name.len = outarg.namelen; | |
1531 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1532 | if (err) | |
1533 | goto err; | |
1534 | fuse_copy_finish(cs); | |
1535 | buf[outarg.namelen] = 0; | |
1536 | name.hash = full_name_hash(name.name, name.len); | |
1537 | ||
1538 | down_read(&fc->killsb); | |
1539 | err = -ENOENT; | |
b21dda43 | 1540 | if (fc->sb) |
451d0f59 JM |
1541 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name); |
1542 | up_read(&fc->killsb); | |
1543 | kfree(buf); | |
1544 | return err; | |
1545 | ||
1546 | err: | |
1547 | kfree(buf); | |
1548 | fuse_copy_finish(cs); | |
1549 | return err; | |
1550 | } | |
1551 | ||
1552 | static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size, | |
1553 | struct fuse_copy_state *cs) | |
1554 | { | |
1555 | struct fuse_notify_delete_out outarg; | |
1556 | int err = -ENOMEM; | |
1557 | char *buf; | |
1558 | struct qstr name; | |
1559 | ||
1560 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); | |
1561 | if (!buf) | |
1562 | goto err; | |
1563 | ||
1564 | err = -EINVAL; | |
1565 | if (size < sizeof(outarg)) | |
1566 | goto err; | |
1567 | ||
1568 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1569 | if (err) | |
1570 | goto err; | |
1571 | ||
1572 | err = -ENAMETOOLONG; | |
1573 | if (outarg.namelen > FUSE_NAME_MAX) | |
1574 | goto err; | |
1575 | ||
1576 | err = -EINVAL; | |
1577 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1578 | goto err; | |
1579 | ||
1580 | name.name = buf; | |
1581 | name.len = outarg.namelen; | |
1582 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1583 | if (err) | |
1584 | goto err; | |
1585 | fuse_copy_finish(cs); | |
1586 | buf[outarg.namelen] = 0; | |
1587 | name.hash = full_name_hash(name.name, name.len); | |
1588 | ||
1589 | down_read(&fc->killsb); | |
1590 | err = -ENOENT; | |
1591 | if (fc->sb) | |
1592 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, | |
1593 | outarg.child, &name); | |
3b463ae0 | 1594 | up_read(&fc->killsb); |
b2d82ee3 | 1595 | kfree(buf); |
3b463ae0 JM |
1596 | return err; |
1597 | ||
1598 | err: | |
b2d82ee3 | 1599 | kfree(buf); |
3b463ae0 JM |
1600 | fuse_copy_finish(cs); |
1601 | return err; | |
1602 | } | |
1603 | ||
a1d75f25 MS |
1604 | static int fuse_notify_store(struct fuse_conn *fc, unsigned int size, |
1605 | struct fuse_copy_state *cs) | |
1606 | { | |
1607 | struct fuse_notify_store_out outarg; | |
1608 | struct inode *inode; | |
1609 | struct address_space *mapping; | |
1610 | u64 nodeid; | |
1611 | int err; | |
1612 | pgoff_t index; | |
1613 | unsigned int offset; | |
1614 | unsigned int num; | |
1615 | loff_t file_size; | |
1616 | loff_t end; | |
1617 | ||
1618 | err = -EINVAL; | |
1619 | if (size < sizeof(outarg)) | |
1620 | goto out_finish; | |
1621 | ||
1622 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1623 | if (err) | |
1624 | goto out_finish; | |
1625 | ||
1626 | err = -EINVAL; | |
1627 | if (size - sizeof(outarg) != outarg.size) | |
1628 | goto out_finish; | |
1629 | ||
1630 | nodeid = outarg.nodeid; | |
1631 | ||
1632 | down_read(&fc->killsb); | |
1633 | ||
1634 | err = -ENOENT; | |
1635 | if (!fc->sb) | |
1636 | goto out_up_killsb; | |
1637 | ||
1638 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1639 | if (!inode) | |
1640 | goto out_up_killsb; | |
1641 | ||
1642 | mapping = inode->i_mapping; | |
1643 | index = outarg.offset >> PAGE_CACHE_SHIFT; | |
1644 | offset = outarg.offset & ~PAGE_CACHE_MASK; | |
1645 | file_size = i_size_read(inode); | |
1646 | end = outarg.offset + outarg.size; | |
1647 | if (end > file_size) { | |
1648 | file_size = end; | |
1649 | fuse_write_update_size(inode, file_size); | |
1650 | } | |
1651 | ||
1652 | num = outarg.size; | |
1653 | while (num) { | |
1654 | struct page *page; | |
1655 | unsigned int this_num; | |
1656 | ||
1657 | err = -ENOMEM; | |
1658 | page = find_or_create_page(mapping, index, | |
1659 | mapping_gfp_mask(mapping)); | |
1660 | if (!page) | |
1661 | goto out_iput; | |
1662 | ||
1663 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); | |
1664 | err = fuse_copy_page(cs, &page, offset, this_num, 0); | |
063ec1e5 MS |
1665 | if (!err && offset == 0 && |
1666 | (this_num == PAGE_CACHE_SIZE || file_size == end)) | |
a1d75f25 MS |
1667 | SetPageUptodate(page); |
1668 | unlock_page(page); | |
1669 | page_cache_release(page); | |
1670 | ||
1671 | if (err) | |
1672 | goto out_iput; | |
1673 | ||
1674 | num -= this_num; | |
1675 | offset = 0; | |
1676 | index++; | |
1677 | } | |
1678 | ||
1679 | err = 0; | |
1680 | ||
1681 | out_iput: | |
1682 | iput(inode); | |
1683 | out_up_killsb: | |
1684 | up_read(&fc->killsb); | |
1685 | out_finish: | |
1686 | fuse_copy_finish(cs); | |
1687 | return err; | |
1688 | } | |
1689 | ||
2d45ba38 MS |
1690 | static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req) |
1691 | { | |
b745bc85 | 1692 | release_pages(req->pages, req->num_pages, false); |
2d45ba38 MS |
1693 | } |
1694 | ||
1695 | static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode, | |
1696 | struct fuse_notify_retrieve_out *outarg) | |
1697 | { | |
1698 | int err; | |
1699 | struct address_space *mapping = inode->i_mapping; | |
1700 | struct fuse_req *req; | |
1701 | pgoff_t index; | |
1702 | loff_t file_size; | |
1703 | unsigned int num; | |
1704 | unsigned int offset; | |
0157443c | 1705 | size_t total_len = 0; |
4d53dc99 | 1706 | int num_pages; |
2d45ba38 | 1707 | |
4d53dc99 MP |
1708 | offset = outarg->offset & ~PAGE_CACHE_MASK; |
1709 | file_size = i_size_read(inode); | |
1710 | ||
1711 | num = outarg->size; | |
1712 | if (outarg->offset > file_size) | |
1713 | num = 0; | |
1714 | else if (outarg->offset + num > file_size) | |
1715 | num = file_size - outarg->offset; | |
1716 | ||
1717 | num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
1718 | num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ); | |
1719 | ||
1720 | req = fuse_get_req(fc, num_pages); | |
2d45ba38 MS |
1721 | if (IS_ERR(req)) |
1722 | return PTR_ERR(req); | |
1723 | ||
2d45ba38 MS |
1724 | req->in.h.opcode = FUSE_NOTIFY_REPLY; |
1725 | req->in.h.nodeid = outarg->nodeid; | |
1726 | req->in.numargs = 2; | |
1727 | req->in.argpages = 1; | |
b2430d75 | 1728 | req->page_descs[0].offset = offset; |
2d45ba38 MS |
1729 | req->end = fuse_retrieve_end; |
1730 | ||
1731 | index = outarg->offset >> PAGE_CACHE_SHIFT; | |
2d45ba38 | 1732 | |
4d53dc99 | 1733 | while (num && req->num_pages < num_pages) { |
2d45ba38 MS |
1734 | struct page *page; |
1735 | unsigned int this_num; | |
1736 | ||
1737 | page = find_get_page(mapping, index); | |
1738 | if (!page) | |
1739 | break; | |
1740 | ||
1741 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); | |
1742 | req->pages[req->num_pages] = page; | |
85f40aec | 1743 | req->page_descs[req->num_pages].length = this_num; |
2d45ba38 MS |
1744 | req->num_pages++; |
1745 | ||
c9e67d48 | 1746 | offset = 0; |
2d45ba38 MS |
1747 | num -= this_num; |
1748 | total_len += this_num; | |
48706d0a | 1749 | index++; |
2d45ba38 MS |
1750 | } |
1751 | req->misc.retrieve_in.offset = outarg->offset; | |
1752 | req->misc.retrieve_in.size = total_len; | |
1753 | req->in.args[0].size = sizeof(req->misc.retrieve_in); | |
1754 | req->in.args[0].value = &req->misc.retrieve_in; | |
1755 | req->in.args[1].size = total_len; | |
1756 | ||
1757 | err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique); | |
1758 | if (err) | |
1759 | fuse_retrieve_end(fc, req); | |
1760 | ||
1761 | return err; | |
1762 | } | |
1763 | ||
1764 | static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size, | |
1765 | struct fuse_copy_state *cs) | |
1766 | { | |
1767 | struct fuse_notify_retrieve_out outarg; | |
1768 | struct inode *inode; | |
1769 | int err; | |
1770 | ||
1771 | err = -EINVAL; | |
1772 | if (size != sizeof(outarg)) | |
1773 | goto copy_finish; | |
1774 | ||
1775 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1776 | if (err) | |
1777 | goto copy_finish; | |
1778 | ||
1779 | fuse_copy_finish(cs); | |
1780 | ||
1781 | down_read(&fc->killsb); | |
1782 | err = -ENOENT; | |
1783 | if (fc->sb) { | |
1784 | u64 nodeid = outarg.nodeid; | |
1785 | ||
1786 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1787 | if (inode) { | |
1788 | err = fuse_retrieve(fc, inode, &outarg); | |
1789 | iput(inode); | |
1790 | } | |
1791 | } | |
1792 | up_read(&fc->killsb); | |
1793 | ||
1794 | return err; | |
1795 | ||
1796 | copy_finish: | |
1797 | fuse_copy_finish(cs); | |
1798 | return err; | |
1799 | } | |
1800 | ||
8599396b TH |
1801 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
1802 | unsigned int size, struct fuse_copy_state *cs) | |
1803 | { | |
0d278362 MS |
1804 | /* Don't try to move pages (yet) */ |
1805 | cs->move_pages = 0; | |
1806 | ||
8599396b | 1807 | switch (code) { |
95668a69 TH |
1808 | case FUSE_NOTIFY_POLL: |
1809 | return fuse_notify_poll(fc, size, cs); | |
1810 | ||
3b463ae0 JM |
1811 | case FUSE_NOTIFY_INVAL_INODE: |
1812 | return fuse_notify_inval_inode(fc, size, cs); | |
1813 | ||
1814 | case FUSE_NOTIFY_INVAL_ENTRY: | |
1815 | return fuse_notify_inval_entry(fc, size, cs); | |
1816 | ||
a1d75f25 MS |
1817 | case FUSE_NOTIFY_STORE: |
1818 | return fuse_notify_store(fc, size, cs); | |
1819 | ||
2d45ba38 MS |
1820 | case FUSE_NOTIFY_RETRIEVE: |
1821 | return fuse_notify_retrieve(fc, size, cs); | |
1822 | ||
451d0f59 JM |
1823 | case FUSE_NOTIFY_DELETE: |
1824 | return fuse_notify_delete(fc, size, cs); | |
1825 | ||
8599396b | 1826 | default: |
f6d47a17 | 1827 | fuse_copy_finish(cs); |
8599396b TH |
1828 | return -EINVAL; |
1829 | } | |
1830 | } | |
1831 | ||
334f485d MS |
1832 | /* Look up request on processing list by unique ID */ |
1833 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) | |
1834 | { | |
05726aca | 1835 | struct fuse_req *req; |
334f485d | 1836 | |
05726aca | 1837 | list_for_each_entry(req, &fc->processing, list) { |
a4d27e75 | 1838 | if (req->in.h.unique == unique || req->intr_unique == unique) |
334f485d MS |
1839 | return req; |
1840 | } | |
1841 | return NULL; | |
1842 | } | |
1843 | ||
1844 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, | |
1845 | unsigned nbytes) | |
1846 | { | |
1847 | unsigned reqsize = sizeof(struct fuse_out_header); | |
1848 | ||
1849 | if (out->h.error) | |
1850 | return nbytes != reqsize ? -EINVAL : 0; | |
1851 | ||
1852 | reqsize += len_args(out->numargs, out->args); | |
1853 | ||
1854 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) | |
1855 | return -EINVAL; | |
1856 | else if (reqsize > nbytes) { | |
1857 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; | |
1858 | unsigned diffsize = reqsize - nbytes; | |
1859 | if (diffsize > lastarg->size) | |
1860 | return -EINVAL; | |
1861 | lastarg->size -= diffsize; | |
1862 | } | |
1863 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, | |
1864 | out->page_zeroing); | |
1865 | } | |
1866 | ||
1867 | /* | |
1868 | * Write a single reply to a request. First the header is copied from | |
1869 | * the write buffer. The request is then searched on the processing | |
1870 | * list by the unique ID found in the header. If found, then remove | |
1871 | * it from the list and copy the rest of the buffer to the request. | |
1872 | * The request is finished by calling request_end() | |
1873 | */ | |
dd3bb14f MS |
1874 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
1875 | struct fuse_copy_state *cs, size_t nbytes) | |
334f485d MS |
1876 | { |
1877 | int err; | |
334f485d MS |
1878 | struct fuse_req *req; |
1879 | struct fuse_out_header oh; | |
334f485d | 1880 | |
334f485d MS |
1881 | if (nbytes < sizeof(struct fuse_out_header)) |
1882 | return -EINVAL; | |
1883 | ||
dd3bb14f | 1884 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
334f485d MS |
1885 | if (err) |
1886 | goto err_finish; | |
8599396b TH |
1887 | |
1888 | err = -EINVAL; | |
1889 | if (oh.len != nbytes) | |
1890 | goto err_finish; | |
1891 | ||
1892 | /* | |
1893 | * Zero oh.unique indicates unsolicited notification message | |
1894 | * and error contains notification code. | |
1895 | */ | |
1896 | if (!oh.unique) { | |
dd3bb14f | 1897 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
8599396b TH |
1898 | return err ? err : nbytes; |
1899 | } | |
1900 | ||
334f485d | 1901 | err = -EINVAL; |
8599396b | 1902 | if (oh.error <= -1000 || oh.error > 0) |
334f485d MS |
1903 | goto err_finish; |
1904 | ||
d7133114 | 1905 | spin_lock(&fc->lock); |
69a53bf2 MS |
1906 | err = -ENOENT; |
1907 | if (!fc->connected) | |
1908 | goto err_unlock; | |
1909 | ||
334f485d | 1910 | req = request_find(fc, oh.unique); |
334f485d MS |
1911 | if (!req) |
1912 | goto err_unlock; | |
1913 | ||
f9a2842e | 1914 | if (req->aborted) { |
d7133114 | 1915 | spin_unlock(&fc->lock); |
dd3bb14f | 1916 | fuse_copy_finish(cs); |
d7133114 | 1917 | spin_lock(&fc->lock); |
222f1d69 | 1918 | request_end(fc, req); |
334f485d MS |
1919 | return -ENOENT; |
1920 | } | |
a4d27e75 MS |
1921 | /* Is it an interrupt reply? */ |
1922 | if (req->intr_unique == oh.unique) { | |
1923 | err = -EINVAL; | |
1924 | if (nbytes != sizeof(struct fuse_out_header)) | |
1925 | goto err_unlock; | |
1926 | ||
1927 | if (oh.error == -ENOSYS) | |
1928 | fc->no_interrupt = 1; | |
1929 | else if (oh.error == -EAGAIN) | |
1930 | queue_interrupt(fc, req); | |
1931 | ||
1932 | spin_unlock(&fc->lock); | |
dd3bb14f | 1933 | fuse_copy_finish(cs); |
a4d27e75 MS |
1934 | return nbytes; |
1935 | } | |
1936 | ||
1937 | req->state = FUSE_REQ_WRITING; | |
d77a1d5b | 1938 | list_move(&req->list, &fc->io); |
334f485d MS |
1939 | req->out.h = oh; |
1940 | req->locked = 1; | |
dd3bb14f | 1941 | cs->req = req; |
ce534fb0 MS |
1942 | if (!req->out.page_replace) |
1943 | cs->move_pages = 0; | |
d7133114 | 1944 | spin_unlock(&fc->lock); |
334f485d | 1945 | |
dd3bb14f MS |
1946 | err = copy_out_args(cs, &req->out, nbytes); |
1947 | fuse_copy_finish(cs); | |
334f485d | 1948 | |
d7133114 | 1949 | spin_lock(&fc->lock); |
334f485d MS |
1950 | req->locked = 0; |
1951 | if (!err) { | |
f9a2842e | 1952 | if (req->aborted) |
334f485d | 1953 | err = -ENOENT; |
f9a2842e | 1954 | } else if (!req->aborted) |
334f485d MS |
1955 | req->out.h.error = -EIO; |
1956 | request_end(fc, req); | |
1957 | ||
1958 | return err ? err : nbytes; | |
1959 | ||
1960 | err_unlock: | |
d7133114 | 1961 | spin_unlock(&fc->lock); |
334f485d | 1962 | err_finish: |
dd3bb14f | 1963 | fuse_copy_finish(cs); |
334f485d MS |
1964 | return err; |
1965 | } | |
1966 | ||
fbdbacca | 1967 | static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from) |
dd3bb14f MS |
1968 | { |
1969 | struct fuse_copy_state cs; | |
1970 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); | |
1971 | if (!fc) | |
1972 | return -EPERM; | |
1973 | ||
fbdbacca AV |
1974 | if (!iter_is_iovec(from)) |
1975 | return -EINVAL; | |
1976 | ||
6c09e94a | 1977 | fuse_copy_init(&cs, fc, 0, from); |
dd3bb14f | 1978 | |
fbdbacca | 1979 | return fuse_dev_do_write(fc, &cs, iov_iter_count(from)); |
dd3bb14f MS |
1980 | } |
1981 | ||
1982 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, | |
1983 | struct file *out, loff_t *ppos, | |
1984 | size_t len, unsigned int flags) | |
1985 | { | |
1986 | unsigned nbuf; | |
1987 | unsigned idx; | |
1988 | struct pipe_buffer *bufs; | |
1989 | struct fuse_copy_state cs; | |
1990 | struct fuse_conn *fc; | |
1991 | size_t rem; | |
1992 | ssize_t ret; | |
1993 | ||
1994 | fc = fuse_get_conn(out); | |
1995 | if (!fc) | |
1996 | return -EPERM; | |
1997 | ||
07e77dca | 1998 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
dd3bb14f MS |
1999 | if (!bufs) |
2000 | return -ENOMEM; | |
2001 | ||
2002 | pipe_lock(pipe); | |
2003 | nbuf = 0; | |
2004 | rem = 0; | |
2005 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) | |
2006 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; | |
2007 | ||
2008 | ret = -EINVAL; | |
2009 | if (rem < len) { | |
2010 | pipe_unlock(pipe); | |
2011 | goto out; | |
2012 | } | |
2013 | ||
2014 | rem = len; | |
2015 | while (rem) { | |
2016 | struct pipe_buffer *ibuf; | |
2017 | struct pipe_buffer *obuf; | |
2018 | ||
2019 | BUG_ON(nbuf >= pipe->buffers); | |
2020 | BUG_ON(!pipe->nrbufs); | |
2021 | ibuf = &pipe->bufs[pipe->curbuf]; | |
2022 | obuf = &bufs[nbuf]; | |
2023 | ||
2024 | if (rem >= ibuf->len) { | |
2025 | *obuf = *ibuf; | |
2026 | ibuf->ops = NULL; | |
2027 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); | |
2028 | pipe->nrbufs--; | |
2029 | } else { | |
2030 | ibuf->ops->get(pipe, ibuf); | |
2031 | *obuf = *ibuf; | |
2032 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; | |
2033 | obuf->len = rem; | |
2034 | ibuf->offset += obuf->len; | |
2035 | ibuf->len -= obuf->len; | |
2036 | } | |
2037 | nbuf++; | |
2038 | rem -= obuf->len; | |
2039 | } | |
2040 | pipe_unlock(pipe); | |
2041 | ||
6c09e94a | 2042 | fuse_copy_init(&cs, fc, 0, NULL); |
dd3bb14f | 2043 | cs.pipebufs = bufs; |
6c09e94a | 2044 | cs.nr_segs = nbuf; |
dd3bb14f MS |
2045 | cs.pipe = pipe; |
2046 | ||
ce534fb0 MS |
2047 | if (flags & SPLICE_F_MOVE) |
2048 | cs.move_pages = 1; | |
2049 | ||
dd3bb14f MS |
2050 | ret = fuse_dev_do_write(fc, &cs, len); |
2051 | ||
2052 | for (idx = 0; idx < nbuf; idx++) { | |
2053 | struct pipe_buffer *buf = &bufs[idx]; | |
2054 | buf->ops->release(pipe, buf); | |
2055 | } | |
2056 | out: | |
2057 | kfree(bufs); | |
2058 | return ret; | |
2059 | } | |
2060 | ||
334f485d MS |
2061 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
2062 | { | |
334f485d | 2063 | unsigned mask = POLLOUT | POLLWRNORM; |
7025d9ad | 2064 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 2065 | if (!fc) |
7025d9ad | 2066 | return POLLERR; |
334f485d MS |
2067 | |
2068 | poll_wait(file, &fc->waitq, wait); | |
2069 | ||
d7133114 | 2070 | spin_lock(&fc->lock); |
7025d9ad MS |
2071 | if (!fc->connected) |
2072 | mask = POLLERR; | |
a4d27e75 | 2073 | else if (request_pending(fc)) |
7025d9ad | 2074 | mask |= POLLIN | POLLRDNORM; |
d7133114 | 2075 | spin_unlock(&fc->lock); |
334f485d MS |
2076 | |
2077 | return mask; | |
2078 | } | |
2079 | ||
69a53bf2 MS |
2080 | /* |
2081 | * Abort all requests on the given list (pending or processing) | |
2082 | * | |
d7133114 | 2083 | * This function releases and reacquires fc->lock |
69a53bf2 | 2084 | */ |
334f485d | 2085 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
b9ca67b2 MS |
2086 | __releases(fc->lock) |
2087 | __acquires(fc->lock) | |
334f485d MS |
2088 | { |
2089 | while (!list_empty(head)) { | |
2090 | struct fuse_req *req; | |
2091 | req = list_entry(head->next, struct fuse_req, list); | |
334f485d MS |
2092 | req->out.h.error = -ECONNABORTED; |
2093 | request_end(fc, req); | |
d7133114 | 2094 | spin_lock(&fc->lock); |
334f485d MS |
2095 | } |
2096 | } | |
2097 | ||
69a53bf2 MS |
2098 | /* |
2099 | * Abort requests under I/O | |
2100 | * | |
f9a2842e | 2101 | * The requests are set to aborted and finished, and the request |
69a53bf2 MS |
2102 | * waiter is woken up. This will make request_wait_answer() wait |
2103 | * until the request is unlocked and then return. | |
64c6d8ed MS |
2104 | * |
2105 | * If the request is asynchronous, then the end function needs to be | |
2106 | * called after waiting for the request to be unlocked (if it was | |
2107 | * locked). | |
69a53bf2 MS |
2108 | */ |
2109 | static void end_io_requests(struct fuse_conn *fc) | |
b9ca67b2 MS |
2110 | __releases(fc->lock) |
2111 | __acquires(fc->lock) | |
69a53bf2 MS |
2112 | { |
2113 | while (!list_empty(&fc->io)) { | |
64c6d8ed MS |
2114 | struct fuse_req *req = |
2115 | list_entry(fc->io.next, struct fuse_req, list); | |
2116 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; | |
2117 | ||
f9a2842e | 2118 | req->aborted = 1; |
69a53bf2 MS |
2119 | req->out.h.error = -ECONNABORTED; |
2120 | req->state = FUSE_REQ_FINISHED; | |
2121 | list_del_init(&req->list); | |
2122 | wake_up(&req->waitq); | |
64c6d8ed MS |
2123 | if (end) { |
2124 | req->end = NULL; | |
64c6d8ed | 2125 | __fuse_get_request(req); |
d7133114 | 2126 | spin_unlock(&fc->lock); |
64c6d8ed MS |
2127 | wait_event(req->waitq, !req->locked); |
2128 | end(fc, req); | |
e9bb09dd | 2129 | fuse_put_request(fc, req); |
d7133114 | 2130 | spin_lock(&fc->lock); |
64c6d8ed | 2131 | } |
69a53bf2 MS |
2132 | } |
2133 | } | |
2134 | ||
595afaf9 | 2135 | static void end_queued_requests(struct fuse_conn *fc) |
b9ca67b2 MS |
2136 | __releases(fc->lock) |
2137 | __acquires(fc->lock) | |
595afaf9 MS |
2138 | { |
2139 | fc->max_background = UINT_MAX; | |
2140 | flush_bg_queue(fc); | |
2141 | end_requests(fc, &fc->pending); | |
2142 | end_requests(fc, &fc->processing); | |
07e77dca | 2143 | while (forget_pending(fc)) |
02c048b9 | 2144 | kfree(dequeue_forget(fc, 1, NULL)); |
595afaf9 MS |
2145 | } |
2146 | ||
357ccf2b BG |
2147 | static void end_polls(struct fuse_conn *fc) |
2148 | { | |
2149 | struct rb_node *p; | |
2150 | ||
2151 | p = rb_first(&fc->polled_files); | |
2152 | ||
2153 | while (p) { | |
2154 | struct fuse_file *ff; | |
2155 | ff = rb_entry(p, struct fuse_file, polled_node); | |
2156 | wake_up_interruptible_all(&ff->poll_wait); | |
2157 | ||
2158 | p = rb_next(p); | |
2159 | } | |
2160 | } | |
2161 | ||
69a53bf2 MS |
2162 | /* |
2163 | * Abort all requests. | |
2164 | * | |
2165 | * Emergency exit in case of a malicious or accidental deadlock, or | |
2166 | * just a hung filesystem. | |
2167 | * | |
2168 | * The same effect is usually achievable through killing the | |
2169 | * filesystem daemon and all users of the filesystem. The exception | |
2170 | * is the combination of an asynchronous request and the tricky | |
2171 | * deadlock (see Documentation/filesystems/fuse.txt). | |
2172 | * | |
2173 | * During the aborting, progression of requests from the pending and | |
2174 | * processing lists onto the io list, and progression of new requests | |
2175 | * onto the pending list is prevented by req->connected being false. | |
2176 | * | |
2177 | * Progression of requests under I/O to the processing list is | |
f9a2842e MS |
2178 | * prevented by the req->aborted flag being true for these requests. |
2179 | * For this reason requests on the io list must be aborted first. | |
69a53bf2 MS |
2180 | */ |
2181 | void fuse_abort_conn(struct fuse_conn *fc) | |
2182 | { | |
d7133114 | 2183 | spin_lock(&fc->lock); |
69a53bf2 MS |
2184 | if (fc->connected) { |
2185 | fc->connected = 0; | |
51eb01e7 | 2186 | fc->blocked = 0; |
9759bd51 | 2187 | fuse_set_initialized(fc); |
69a53bf2 | 2188 | end_io_requests(fc); |
595afaf9 | 2189 | end_queued_requests(fc); |
357ccf2b | 2190 | end_polls(fc); |
69a53bf2 | 2191 | wake_up_all(&fc->waitq); |
51eb01e7 | 2192 | wake_up_all(&fc->blocked_waitq); |
385a17bf | 2193 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
69a53bf2 | 2194 | } |
d7133114 | 2195 | spin_unlock(&fc->lock); |
69a53bf2 | 2196 | } |
08cbf542 | 2197 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
69a53bf2 | 2198 | |
08cbf542 | 2199 | int fuse_dev_release(struct inode *inode, struct file *file) |
334f485d | 2200 | { |
0720b315 | 2201 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 2202 | if (fc) { |
d7133114 | 2203 | spin_lock(&fc->lock); |
1e9a4ed9 | 2204 | fc->connected = 0; |
595afaf9 | 2205 | fc->blocked = 0; |
9759bd51 | 2206 | fuse_set_initialized(fc); |
595afaf9 | 2207 | end_queued_requests(fc); |
357ccf2b | 2208 | end_polls(fc); |
595afaf9 | 2209 | wake_up_all(&fc->blocked_waitq); |
d7133114 | 2210 | spin_unlock(&fc->lock); |
bafa9654 | 2211 | fuse_conn_put(fc); |
385a17bf | 2212 | } |
f543f253 | 2213 | |
334f485d MS |
2214 | return 0; |
2215 | } | |
08cbf542 | 2216 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
334f485d | 2217 | |
385a17bf JD |
2218 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
2219 | { | |
2220 | struct fuse_conn *fc = fuse_get_conn(file); | |
2221 | if (!fc) | |
a87046d8 | 2222 | return -EPERM; |
385a17bf JD |
2223 | |
2224 | /* No locking - fasync_helper does its own locking */ | |
2225 | return fasync_helper(fd, file, on, &fc->fasync); | |
2226 | } | |
2227 | ||
4b6f5d20 | 2228 | const struct file_operations fuse_dev_operations = { |
334f485d | 2229 | .owner = THIS_MODULE, |
94e4fe2c | 2230 | .open = fuse_dev_open, |
334f485d | 2231 | .llseek = no_llseek, |
fbdbacca | 2232 | .read_iter = fuse_dev_read, |
c3021629 | 2233 | .splice_read = fuse_dev_splice_read, |
fbdbacca | 2234 | .write_iter = fuse_dev_write, |
dd3bb14f | 2235 | .splice_write = fuse_dev_splice_write, |
334f485d MS |
2236 | .poll = fuse_dev_poll, |
2237 | .release = fuse_dev_release, | |
385a17bf | 2238 | .fasync = fuse_dev_fasync, |
334f485d | 2239 | }; |
08cbf542 | 2240 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
334f485d MS |
2241 | |
2242 | static struct miscdevice fuse_miscdevice = { | |
2243 | .minor = FUSE_MINOR, | |
2244 | .name = "fuse", | |
2245 | .fops = &fuse_dev_operations, | |
2246 | }; | |
2247 | ||
2248 | int __init fuse_dev_init(void) | |
2249 | { | |
2250 | int err = -ENOMEM; | |
2251 | fuse_req_cachep = kmem_cache_create("fuse_request", | |
2252 | sizeof(struct fuse_req), | |
20c2df83 | 2253 | 0, 0, NULL); |
334f485d MS |
2254 | if (!fuse_req_cachep) |
2255 | goto out; | |
2256 | ||
2257 | err = misc_register(&fuse_miscdevice); | |
2258 | if (err) | |
2259 | goto out_cache_clean; | |
2260 | ||
2261 | return 0; | |
2262 | ||
2263 | out_cache_clean: | |
2264 | kmem_cache_destroy(fuse_req_cachep); | |
2265 | out: | |
2266 | return err; | |
2267 | } | |
2268 | ||
2269 | void fuse_dev_cleanup(void) | |
2270 | { | |
2271 | misc_deregister(&fuse_miscdevice); | |
2272 | kmem_cache_destroy(fuse_req_cachep); | |
2273 | } |