]>
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 | ||
de155226 MS |
171 | err = -ECONNREFUSED; |
172 | if (fc->conn_error) | |
173 | goto out; | |
174 | ||
b111c8c0 | 175 | req = fuse_request_alloc(npages); |
9bc5ddda | 176 | err = -ENOMEM; |
722d2bea MP |
177 | if (!req) { |
178 | if (for_background) | |
179 | wake_up(&fc->blocked_waitq); | |
9bc5ddda | 180 | goto out; |
722d2bea | 181 | } |
334f485d | 182 | |
33649c91 | 183 | fuse_req_init_context(req); |
825d6d33 MS |
184 | __set_bit(FR_WAITING, &req->flags); |
185 | if (for_background) | |
186 | __set_bit(FR_BACKGROUND, &req->flags); | |
187 | ||
334f485d | 188 | return req; |
9bc5ddda MS |
189 | |
190 | out: | |
191 | atomic_dec(&fc->num_waiting); | |
192 | return ERR_PTR(err); | |
334f485d | 193 | } |
8b41e671 MP |
194 | |
195 | struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages) | |
196 | { | |
197 | return __fuse_get_req(fc, npages, false); | |
198 | } | |
08cbf542 | 199 | EXPORT_SYMBOL_GPL(fuse_get_req); |
334f485d | 200 | |
8b41e671 MP |
201 | struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, |
202 | unsigned npages) | |
203 | { | |
204 | return __fuse_get_req(fc, npages, true); | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(fuse_get_req_for_background); | |
207 | ||
33649c91 MS |
208 | /* |
209 | * Return request in fuse_file->reserved_req. However that may | |
210 | * currently be in use. If that is the case, wait for it to become | |
211 | * available. | |
212 | */ | |
213 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, | |
214 | struct file *file) | |
215 | { | |
216 | struct fuse_req *req = NULL; | |
217 | struct fuse_file *ff = file->private_data; | |
218 | ||
219 | do { | |
de5e3dec | 220 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
33649c91 MS |
221 | spin_lock(&fc->lock); |
222 | if (ff->reserved_req) { | |
223 | req = ff->reserved_req; | |
224 | ff->reserved_req = NULL; | |
cb0942b8 | 225 | req->stolen_file = get_file(file); |
33649c91 MS |
226 | } |
227 | spin_unlock(&fc->lock); | |
228 | } while (!req); | |
229 | ||
230 | return req; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Put stolen request back into fuse_file->reserved_req | |
235 | */ | |
236 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) | |
237 | { | |
238 | struct file *file = req->stolen_file; | |
239 | struct fuse_file *ff = file->private_data; | |
240 | ||
241 | spin_lock(&fc->lock); | |
b2430d75 | 242 | fuse_request_init(req, req->pages, req->page_descs, req->max_pages); |
33649c91 MS |
243 | BUG_ON(ff->reserved_req); |
244 | ff->reserved_req = req; | |
de5e3dec | 245 | wake_up_all(&fc->reserved_req_waitq); |
33649c91 MS |
246 | spin_unlock(&fc->lock); |
247 | fput(file); | |
248 | } | |
249 | ||
250 | /* | |
251 | * Gets a requests for a file operation, always succeeds | |
252 | * | |
253 | * This is used for sending the FLUSH request, which must get to | |
254 | * userspace, due to POSIX locks which may need to be unlocked. | |
255 | * | |
256 | * If allocation fails due to OOM, use the reserved request in | |
257 | * fuse_file. | |
258 | * | |
259 | * This is very unlikely to deadlock accidentally, since the | |
260 | * filesystem should not have it's own file open. If deadlock is | |
261 | * intentional, it can still be broken by "aborting" the filesystem. | |
262 | */ | |
b111c8c0 MP |
263 | struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, |
264 | struct file *file) | |
33649c91 MS |
265 | { |
266 | struct fuse_req *req; | |
267 | ||
268 | atomic_inc(&fc->num_waiting); | |
0aada884 | 269 | wait_event(fc->blocked_waitq, fc->initialized); |
9759bd51 MS |
270 | /* Matches smp_wmb() in fuse_set_initialized() */ |
271 | smp_rmb(); | |
b111c8c0 | 272 | req = fuse_request_alloc(0); |
33649c91 MS |
273 | if (!req) |
274 | req = get_reserved_req(fc, file); | |
275 | ||
276 | fuse_req_init_context(req); | |
825d6d33 MS |
277 | __set_bit(FR_WAITING, &req->flags); |
278 | __clear_bit(FR_BACKGROUND, &req->flags); | |
33649c91 MS |
279 | return req; |
280 | } | |
281 | ||
334f485d | 282 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
7128ec2a MS |
283 | { |
284 | if (atomic_dec_and_test(&req->count)) { | |
825d6d33 | 285 | if (test_bit(FR_BACKGROUND, &req->flags)) { |
722d2bea MP |
286 | /* |
287 | * We get here in the unlikely case that a background | |
288 | * request was allocated but not sent | |
289 | */ | |
290 | spin_lock(&fc->lock); | |
291 | if (!fc->blocked) | |
292 | wake_up(&fc->blocked_waitq); | |
293 | spin_unlock(&fc->lock); | |
294 | } | |
295 | ||
825d6d33 MS |
296 | if (test_bit(FR_WAITING, &req->flags)) { |
297 | __clear_bit(FR_WAITING, &req->flags); | |
9bc5ddda | 298 | atomic_dec(&fc->num_waiting); |
73e0e738 | 299 | } |
33649c91 MS |
300 | |
301 | if (req->stolen_file) | |
302 | put_reserved_req(fc, req); | |
303 | else | |
304 | fuse_request_free(req); | |
7128ec2a MS |
305 | } |
306 | } | |
08cbf542 | 307 | EXPORT_SYMBOL_GPL(fuse_put_request); |
7128ec2a | 308 | |
d12def1b MS |
309 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
310 | { | |
311 | unsigned nbytes = 0; | |
312 | unsigned i; | |
313 | ||
314 | for (i = 0; i < numargs; i++) | |
315 | nbytes += args[i].size; | |
316 | ||
317 | return nbytes; | |
318 | } | |
319 | ||
320 | static u64 fuse_get_unique(struct fuse_conn *fc) | |
321 | { | |
7d2e0a09 | 322 | return ++fc->reqctr; |
d12def1b MS |
323 | } |
324 | ||
325 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) | |
326 | { | |
d12def1b MS |
327 | req->in.h.len = sizeof(struct fuse_in_header) + |
328 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); | |
329 | list_add_tail(&req->list, &fc->pending); | |
330 | req->state = FUSE_REQ_PENDING; | |
d12def1b MS |
331 | wake_up(&fc->waitq); |
332 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
333 | } | |
334 | ||
07e77dca MS |
335 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
336 | u64 nodeid, u64 nlookup) | |
337 | { | |
02c048b9 MS |
338 | forget->forget_one.nodeid = nodeid; |
339 | forget->forget_one.nlookup = nlookup; | |
07e77dca MS |
340 | |
341 | spin_lock(&fc->lock); | |
5dfcc87f MS |
342 | if (fc->connected) { |
343 | fc->forget_list_tail->next = forget; | |
344 | fc->forget_list_tail = forget; | |
345 | wake_up(&fc->waitq); | |
346 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
347 | } else { | |
348 | kfree(forget); | |
349 | } | |
07e77dca MS |
350 | spin_unlock(&fc->lock); |
351 | } | |
352 | ||
d12def1b MS |
353 | static void flush_bg_queue(struct fuse_conn *fc) |
354 | { | |
7a6d3c8b | 355 | while (fc->active_background < fc->max_background && |
d12def1b MS |
356 | !list_empty(&fc->bg_queue)) { |
357 | struct fuse_req *req; | |
358 | ||
359 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); | |
360 | list_del(&req->list); | |
361 | fc->active_background++; | |
2d45ba38 | 362 | req->in.h.unique = fuse_get_unique(fc); |
d12def1b MS |
363 | queue_request(fc, req); |
364 | } | |
365 | } | |
366 | ||
334f485d MS |
367 | /* |
368 | * This function is called when a request is finished. Either a reply | |
f9a2842e | 369 | * has arrived or it was aborted (and not yet sent) or some error |
f43b155a | 370 | * occurred during communication with userspace, or the device file |
51eb01e7 MS |
371 | * was closed. The requester thread is woken up (if still waiting), |
372 | * the 'end' callback is called if given, else the reference to the | |
373 | * request is released | |
7128ec2a | 374 | * |
d7133114 | 375 | * Called with fc->lock, unlocks it |
334f485d MS |
376 | */ |
377 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 | 378 | __releases(fc->lock) |
334f485d | 379 | { |
51eb01e7 MS |
380 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
381 | req->end = NULL; | |
0d8e84b0 MS |
382 | list_del_init(&req->list); |
383 | list_del_init(&req->intr_entry); | |
83cfd493 | 384 | req->state = FUSE_REQ_FINISHED; |
825d6d33 MS |
385 | if (test_bit(FR_BACKGROUND, &req->flags)) { |
386 | clear_bit(FR_BACKGROUND, &req->flags); | |
722d2bea | 387 | if (fc->num_background == fc->max_background) |
51eb01e7 | 388 | fc->blocked = 0; |
722d2bea MP |
389 | |
390 | /* Wake up next waiter, if any */ | |
3c18ef81 | 391 | if (!fc->blocked && waitqueue_active(&fc->blocked_waitq)) |
722d2bea MP |
392 | wake_up(&fc->blocked_waitq); |
393 | ||
7a6d3c8b | 394 | if (fc->num_background == fc->congestion_threshold && |
a325f9b9 | 395 | fc->connected && fc->bdi_initialized) { |
8aa7e847 JA |
396 | clear_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
397 | clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC); | |
f92b99b9 | 398 | } |
51eb01e7 | 399 | fc->num_background--; |
d12def1b MS |
400 | fc->active_background--; |
401 | flush_bg_queue(fc); | |
334f485d | 402 | } |
51eb01e7 | 403 | spin_unlock(&fc->lock); |
51eb01e7 MS |
404 | wake_up(&req->waitq); |
405 | if (end) | |
406 | end(fc, req); | |
e9bb09dd | 407 | fuse_put_request(fc, req); |
334f485d MS |
408 | } |
409 | ||
a4d27e75 MS |
410 | static void wait_answer_interruptible(struct fuse_conn *fc, |
411 | struct fuse_req *req) | |
b9ca67b2 MS |
412 | __releases(fc->lock) |
413 | __acquires(fc->lock) | |
a4d27e75 MS |
414 | { |
415 | if (signal_pending(current)) | |
416 | return; | |
417 | ||
418 | spin_unlock(&fc->lock); | |
419 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); | |
420 | spin_lock(&fc->lock); | |
421 | } | |
422 | ||
423 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) | |
424 | { | |
425 | list_add_tail(&req->intr_entry, &fc->interrupts); | |
426 | wake_up(&fc->waitq); | |
427 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); | |
428 | } | |
429 | ||
7c352bdf | 430 | static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) |
b9ca67b2 MS |
431 | __releases(fc->lock) |
432 | __acquires(fc->lock) | |
334f485d | 433 | { |
a4d27e75 MS |
434 | if (!fc->no_interrupt) { |
435 | /* Any signal may interrupt this */ | |
436 | wait_answer_interruptible(fc, req); | |
334f485d | 437 | |
a4d27e75 MS |
438 | if (req->state == FUSE_REQ_FINISHED) |
439 | return; | |
440 | ||
825d6d33 | 441 | set_bit(FR_INTERRUPTED, &req->flags); |
a4d27e75 MS |
442 | if (req->state == FUSE_REQ_SENT) |
443 | queue_interrupt(fc, req); | |
444 | } | |
445 | ||
825d6d33 | 446 | if (!test_bit(FR_FORCE, &req->flags)) { |
a4d27e75 MS |
447 | sigset_t oldset; |
448 | ||
449 | /* Only fatal signals may interrupt this */ | |
51eb01e7 | 450 | block_sigs(&oldset); |
a4d27e75 | 451 | wait_answer_interruptible(fc, req); |
51eb01e7 | 452 | restore_sigs(&oldset); |
a131de0a | 453 | |
a131de0a MS |
454 | if (req->state == FUSE_REQ_FINISHED) |
455 | return; | |
456 | ||
457 | /* Request is not yet in userspace, bail out */ | |
458 | if (req->state == FUSE_REQ_PENDING) { | |
459 | list_del(&req->list); | |
460 | __fuse_put_request(req); | |
461 | req->out.h.error = -EINTR; | |
462 | return; | |
463 | } | |
51eb01e7 | 464 | } |
334f485d | 465 | |
a131de0a MS |
466 | /* |
467 | * Either request is already in userspace, or it was forced. | |
468 | * Wait it out. | |
469 | */ | |
470 | spin_unlock(&fc->lock); | |
471 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); | |
472 | spin_lock(&fc->lock); | |
334f485d MS |
473 | } |
474 | ||
6a4e922c | 475 | static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 476 | { |
825d6d33 | 477 | BUG_ON(test_bit(FR_BACKGROUND, &req->flags)); |
d7133114 | 478 | spin_lock(&fc->lock); |
1e9a4ed9 | 479 | if (!fc->connected) |
334f485d | 480 | req->out.h.error = -ENOTCONN; |
334f485d | 481 | else { |
2d45ba38 | 482 | req->in.h.unique = fuse_get_unique(fc); |
334f485d MS |
483 | queue_request(fc, req); |
484 | /* acquire extra reference, since request is still needed | |
485 | after request_end() */ | |
486 | __fuse_get_request(req); | |
487 | ||
7c352bdf | 488 | request_wait_answer(fc, req); |
334f485d | 489 | } |
d7133114 | 490 | spin_unlock(&fc->lock); |
334f485d | 491 | } |
6a4e922c EW |
492 | |
493 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) | |
494 | { | |
825d6d33 MS |
495 | __set_bit(FR_ISREPLY, &req->flags); |
496 | if (!test_bit(FR_WAITING, &req->flags)) { | |
497 | __set_bit(FR_WAITING, &req->flags); | |
5437f241 MS |
498 | atomic_inc(&fc->num_waiting); |
499 | } | |
6a4e922c EW |
500 | __fuse_request_send(fc, req); |
501 | } | |
08cbf542 | 502 | EXPORT_SYMBOL_GPL(fuse_request_send); |
334f485d | 503 | |
21f62174 MS |
504 | static void fuse_adjust_compat(struct fuse_conn *fc, struct fuse_args *args) |
505 | { | |
506 | if (fc->minor < 4 && args->in.h.opcode == FUSE_STATFS) | |
507 | args->out.args[0].size = FUSE_COMPAT_STATFS_SIZE; | |
508 | ||
509 | if (fc->minor < 9) { | |
510 | switch (args->in.h.opcode) { | |
511 | case FUSE_LOOKUP: | |
512 | case FUSE_CREATE: | |
513 | case FUSE_MKNOD: | |
514 | case FUSE_MKDIR: | |
515 | case FUSE_SYMLINK: | |
516 | case FUSE_LINK: | |
517 | args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
518 | break; | |
519 | case FUSE_GETATTR: | |
520 | case FUSE_SETATTR: | |
521 | args->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
522 | break; | |
523 | } | |
524 | } | |
525 | if (fc->minor < 12) { | |
526 | switch (args->in.h.opcode) { | |
527 | case FUSE_CREATE: | |
528 | args->in.args[0].size = sizeof(struct fuse_open_in); | |
529 | break; | |
530 | case FUSE_MKNOD: | |
531 | args->in.args[0].size = FUSE_COMPAT_MKNOD_IN_SIZE; | |
532 | break; | |
533 | } | |
534 | } | |
535 | } | |
536 | ||
7078187a MS |
537 | ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args) |
538 | { | |
539 | struct fuse_req *req; | |
540 | ssize_t ret; | |
541 | ||
542 | req = fuse_get_req(fc, 0); | |
543 | if (IS_ERR(req)) | |
544 | return PTR_ERR(req); | |
545 | ||
21f62174 MS |
546 | /* Needs to be done after fuse_get_req() so that fc->minor is valid */ |
547 | fuse_adjust_compat(fc, args); | |
548 | ||
7078187a MS |
549 | req->in.h.opcode = args->in.h.opcode; |
550 | req->in.h.nodeid = args->in.h.nodeid; | |
551 | req->in.numargs = args->in.numargs; | |
552 | memcpy(req->in.args, args->in.args, | |
553 | args->in.numargs * sizeof(struct fuse_in_arg)); | |
554 | req->out.argvar = args->out.argvar; | |
555 | req->out.numargs = args->out.numargs; | |
556 | memcpy(req->out.args, args->out.args, | |
557 | args->out.numargs * sizeof(struct fuse_arg)); | |
558 | fuse_request_send(fc, req); | |
559 | ret = req->out.h.error; | |
560 | if (!ret && args->out.argvar) { | |
561 | BUG_ON(args->out.numargs != 1); | |
562 | ret = req->out.args[0].size; | |
563 | } | |
564 | fuse_put_request(fc, req); | |
565 | ||
566 | return ret; | |
567 | } | |
568 | ||
f0139aa8 MS |
569 | /* |
570 | * Called under fc->lock | |
571 | * | |
572 | * fc->connected must have been checked previously | |
573 | */ | |
574 | void fuse_request_send_background_locked(struct fuse_conn *fc, | |
575 | struct fuse_req *req) | |
d12def1b | 576 | { |
825d6d33 MS |
577 | BUG_ON(!test_bit(FR_BACKGROUND, &req->flags)); |
578 | if (!test_bit(FR_WAITING, &req->flags)) { | |
579 | __set_bit(FR_WAITING, &req->flags); | |
5437f241 MS |
580 | atomic_inc(&fc->num_waiting); |
581 | } | |
825d6d33 | 582 | __set_bit(FR_ISREPLY, &req->flags); |
d12def1b | 583 | fc->num_background++; |
7a6d3c8b | 584 | if (fc->num_background == fc->max_background) |
d12def1b | 585 | fc->blocked = 1; |
7a6d3c8b | 586 | if (fc->num_background == fc->congestion_threshold && |
a325f9b9 | 587 | fc->bdi_initialized) { |
8aa7e847 JA |
588 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
589 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); | |
d12def1b MS |
590 | } |
591 | list_add_tail(&req->list, &fc->bg_queue); | |
592 | flush_bg_queue(fc); | |
593 | } | |
594 | ||
f0139aa8 | 595 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 596 | { |
42dc6211 | 597 | BUG_ON(!req->end); |
d7133114 | 598 | spin_lock(&fc->lock); |
1e9a4ed9 | 599 | if (fc->connected) { |
f0139aa8 | 600 | fuse_request_send_background_locked(fc, req); |
d7133114 | 601 | spin_unlock(&fc->lock); |
334f485d | 602 | } else { |
42dc6211 | 603 | spin_unlock(&fc->lock); |
334f485d | 604 | req->out.h.error = -ENOTCONN; |
42dc6211 MS |
605 | req->end(fc, req); |
606 | fuse_put_request(fc, req); | |
334f485d MS |
607 | } |
608 | } | |
08cbf542 | 609 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
334f485d | 610 | |
2d45ba38 MS |
611 | static int fuse_request_send_notify_reply(struct fuse_conn *fc, |
612 | struct fuse_req *req, u64 unique) | |
613 | { | |
614 | int err = -ENODEV; | |
615 | ||
825d6d33 | 616 | __clear_bit(FR_ISREPLY, &req->flags); |
2d45ba38 MS |
617 | req->in.h.unique = unique; |
618 | spin_lock(&fc->lock); | |
619 | if (fc->connected) { | |
620 | queue_request(fc, req); | |
621 | err = 0; | |
622 | } | |
623 | spin_unlock(&fc->lock); | |
624 | ||
625 | return err; | |
626 | } | |
627 | ||
0b05b183 AA |
628 | void fuse_force_forget(struct file *file, u64 nodeid) |
629 | { | |
6131ffaa | 630 | struct inode *inode = file_inode(file); |
0b05b183 AA |
631 | struct fuse_conn *fc = get_fuse_conn(inode); |
632 | struct fuse_req *req; | |
633 | struct fuse_forget_in inarg; | |
634 | ||
635 | memset(&inarg, 0, sizeof(inarg)); | |
636 | inarg.nlookup = 1; | |
b111c8c0 | 637 | req = fuse_get_req_nofail_nopages(fc, file); |
0b05b183 AA |
638 | req->in.h.opcode = FUSE_FORGET; |
639 | req->in.h.nodeid = nodeid; | |
640 | req->in.numargs = 1; | |
641 | req->in.args[0].size = sizeof(inarg); | |
642 | req->in.args[0].value = &inarg; | |
825d6d33 | 643 | __clear_bit(FR_ISREPLY, &req->flags); |
6a4e922c EW |
644 | __fuse_request_send(fc, req); |
645 | /* ignore errors */ | |
646 | fuse_put_request(fc, req); | |
0b05b183 AA |
647 | } |
648 | ||
334f485d MS |
649 | /* |
650 | * Lock the request. Up to the next unlock_request() there mustn't be | |
651 | * anything that could cause a page-fault. If the request was already | |
f9a2842e | 652 | * aborted bail out. |
334f485d | 653 | */ |
dc00809a | 654 | static int lock_request(struct fuse_req *req) |
334f485d MS |
655 | { |
656 | int err = 0; | |
657 | if (req) { | |
dc00809a | 658 | spin_lock(&req->waitq.lock); |
825d6d33 | 659 | if (test_bit(FR_ABORTED, &req->flags)) |
334f485d MS |
660 | err = -ENOENT; |
661 | else | |
825d6d33 | 662 | set_bit(FR_LOCKED, &req->flags); |
dc00809a | 663 | spin_unlock(&req->waitq.lock); |
334f485d MS |
664 | } |
665 | return err; | |
666 | } | |
667 | ||
668 | /* | |
0d8e84b0 MS |
669 | * Unlock request. If it was aborted while locked, caller is responsible |
670 | * for unlocking and ending the request. | |
334f485d | 671 | */ |
dc00809a | 672 | static int unlock_request(struct fuse_req *req) |
334f485d | 673 | { |
0d8e84b0 | 674 | int err = 0; |
334f485d | 675 | if (req) { |
dc00809a | 676 | spin_lock(&req->waitq.lock); |
825d6d33 | 677 | if (test_bit(FR_ABORTED, &req->flags)) |
0d8e84b0 MS |
678 | err = -ENOENT; |
679 | else | |
825d6d33 | 680 | clear_bit(FR_LOCKED, &req->flags); |
dc00809a | 681 | spin_unlock(&req->waitq.lock); |
334f485d | 682 | } |
0d8e84b0 | 683 | return err; |
334f485d MS |
684 | } |
685 | ||
686 | struct fuse_copy_state { | |
687 | int write; | |
688 | struct fuse_req *req; | |
6c09e94a | 689 | struct iov_iter *iter; |
dd3bb14f MS |
690 | struct pipe_buffer *pipebufs; |
691 | struct pipe_buffer *currbuf; | |
692 | struct pipe_inode_info *pipe; | |
334f485d | 693 | unsigned long nr_segs; |
334f485d | 694 | struct page *pg; |
334f485d | 695 | unsigned len; |
c55a01d3 | 696 | unsigned offset; |
ce534fb0 | 697 | unsigned move_pages:1; |
334f485d MS |
698 | }; |
699 | ||
dc00809a | 700 | static void fuse_copy_init(struct fuse_copy_state *cs, int write, |
6c09e94a | 701 | struct iov_iter *iter) |
334f485d MS |
702 | { |
703 | memset(cs, 0, sizeof(*cs)); | |
704 | cs->write = write; | |
6c09e94a | 705 | cs->iter = iter; |
334f485d MS |
706 | } |
707 | ||
708 | /* Unmap and put previous page of userspace buffer */ | |
8bfc016d | 709 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
334f485d | 710 | { |
dd3bb14f MS |
711 | if (cs->currbuf) { |
712 | struct pipe_buffer *buf = cs->currbuf; | |
713 | ||
c55a01d3 | 714 | if (cs->write) |
c3021629 | 715 | buf->len = PAGE_SIZE - cs->len; |
dd3bb14f | 716 | cs->currbuf = NULL; |
c55a01d3 | 717 | } else if (cs->pg) { |
334f485d MS |
718 | if (cs->write) { |
719 | flush_dcache_page(cs->pg); | |
720 | set_page_dirty_lock(cs->pg); | |
721 | } | |
722 | put_page(cs->pg); | |
334f485d | 723 | } |
c55a01d3 | 724 | cs->pg = NULL; |
334f485d MS |
725 | } |
726 | ||
727 | /* | |
728 | * Get another pagefull of userspace buffer, and map it to kernel | |
729 | * address space, and lock request | |
730 | */ | |
731 | static int fuse_copy_fill(struct fuse_copy_state *cs) | |
732 | { | |
c55a01d3 | 733 | struct page *page; |
334f485d MS |
734 | int err; |
735 | ||
dc00809a | 736 | err = unlock_request(cs->req); |
0d8e84b0 MS |
737 | if (err) |
738 | return err; | |
739 | ||
334f485d | 740 | fuse_copy_finish(cs); |
dd3bb14f MS |
741 | if (cs->pipebufs) { |
742 | struct pipe_buffer *buf = cs->pipebufs; | |
743 | ||
c3021629 MS |
744 | if (!cs->write) { |
745 | err = buf->ops->confirm(cs->pipe, buf); | |
746 | if (err) | |
747 | return err; | |
748 | ||
749 | BUG_ON(!cs->nr_segs); | |
750 | cs->currbuf = buf; | |
c55a01d3 MS |
751 | cs->pg = buf->page; |
752 | cs->offset = buf->offset; | |
c3021629 | 753 | cs->len = buf->len; |
c3021629 MS |
754 | cs->pipebufs++; |
755 | cs->nr_segs--; | |
756 | } else { | |
c3021629 MS |
757 | if (cs->nr_segs == cs->pipe->buffers) |
758 | return -EIO; | |
759 | ||
760 | page = alloc_page(GFP_HIGHUSER); | |
761 | if (!page) | |
762 | return -ENOMEM; | |
763 | ||
764 | buf->page = page; | |
765 | buf->offset = 0; | |
766 | buf->len = 0; | |
767 | ||
768 | cs->currbuf = buf; | |
c55a01d3 MS |
769 | cs->pg = page; |
770 | cs->offset = 0; | |
c3021629 MS |
771 | cs->len = PAGE_SIZE; |
772 | cs->pipebufs++; | |
773 | cs->nr_segs++; | |
774 | } | |
dd3bb14f | 775 | } else { |
6c09e94a AV |
776 | size_t off; |
777 | err = iov_iter_get_pages(cs->iter, &page, PAGE_SIZE, 1, &off); | |
dd3bb14f MS |
778 | if (err < 0) |
779 | return err; | |
6c09e94a AV |
780 | BUG_ON(!err); |
781 | cs->len = err; | |
782 | cs->offset = off; | |
c55a01d3 | 783 | cs->pg = page; |
6c09e94a AV |
784 | cs->offset = off; |
785 | iov_iter_advance(cs->iter, err); | |
334f485d | 786 | } |
334f485d | 787 | |
dc00809a | 788 | return lock_request(cs->req); |
334f485d MS |
789 | } |
790 | ||
791 | /* Do as much copy to/from userspace buffer as we can */ | |
8bfc016d | 792 | static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size) |
334f485d MS |
793 | { |
794 | unsigned ncpy = min(*size, cs->len); | |
795 | if (val) { | |
c55a01d3 MS |
796 | void *pgaddr = kmap_atomic(cs->pg); |
797 | void *buf = pgaddr + cs->offset; | |
798 | ||
334f485d | 799 | if (cs->write) |
c55a01d3 | 800 | memcpy(buf, *val, ncpy); |
334f485d | 801 | else |
c55a01d3 MS |
802 | memcpy(*val, buf, ncpy); |
803 | ||
804 | kunmap_atomic(pgaddr); | |
334f485d MS |
805 | *val += ncpy; |
806 | } | |
807 | *size -= ncpy; | |
808 | cs->len -= ncpy; | |
c55a01d3 | 809 | cs->offset += ncpy; |
334f485d MS |
810 | return ncpy; |
811 | } | |
812 | ||
ce534fb0 MS |
813 | static int fuse_check_page(struct page *page) |
814 | { | |
815 | if (page_mapcount(page) || | |
816 | page->mapping != NULL || | |
817 | page_count(page) != 1 || | |
818 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & | |
819 | ~(1 << PG_locked | | |
820 | 1 << PG_referenced | | |
821 | 1 << PG_uptodate | | |
822 | 1 << PG_lru | | |
823 | 1 << PG_active | | |
824 | 1 << PG_reclaim))) { | |
825 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); | |
826 | 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); | |
827 | return 1; | |
828 | } | |
829 | return 0; | |
830 | } | |
831 | ||
832 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) | |
833 | { | |
834 | int err; | |
835 | struct page *oldpage = *pagep; | |
836 | struct page *newpage; | |
837 | struct pipe_buffer *buf = cs->pipebufs; | |
ce534fb0 | 838 | |
dc00809a | 839 | err = unlock_request(cs->req); |
0d8e84b0 MS |
840 | if (err) |
841 | return err; | |
842 | ||
ce534fb0 MS |
843 | fuse_copy_finish(cs); |
844 | ||
845 | err = buf->ops->confirm(cs->pipe, buf); | |
846 | if (err) | |
847 | return err; | |
848 | ||
849 | BUG_ON(!cs->nr_segs); | |
850 | cs->currbuf = buf; | |
851 | cs->len = buf->len; | |
852 | cs->pipebufs++; | |
853 | cs->nr_segs--; | |
854 | ||
855 | if (cs->len != PAGE_SIZE) | |
856 | goto out_fallback; | |
857 | ||
858 | if (buf->ops->steal(cs->pipe, buf) != 0) | |
859 | goto out_fallback; | |
860 | ||
861 | newpage = buf->page; | |
862 | ||
aa991b3b MS |
863 | if (!PageUptodate(newpage)) |
864 | SetPageUptodate(newpage); | |
ce534fb0 MS |
865 | |
866 | ClearPageMappedToDisk(newpage); | |
867 | ||
868 | if (fuse_check_page(newpage) != 0) | |
869 | goto out_fallback_unlock; | |
870 | ||
ce534fb0 MS |
871 | /* |
872 | * This is a new and locked page, it shouldn't be mapped or | |
873 | * have any special flags on it | |
874 | */ | |
875 | if (WARN_ON(page_mapped(oldpage))) | |
876 | goto out_fallback_unlock; | |
877 | if (WARN_ON(page_has_private(oldpage))) | |
878 | goto out_fallback_unlock; | |
879 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) | |
880 | goto out_fallback_unlock; | |
881 | if (WARN_ON(PageMlocked(oldpage))) | |
882 | goto out_fallback_unlock; | |
883 | ||
ef6a3c63 | 884 | err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL); |
ce534fb0 | 885 | if (err) { |
ef6a3c63 MS |
886 | unlock_page(newpage); |
887 | return err; | |
ce534fb0 | 888 | } |
ef6a3c63 | 889 | |
ce534fb0 MS |
890 | page_cache_get(newpage); |
891 | ||
892 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) | |
893 | lru_cache_add_file(newpage); | |
894 | ||
895 | err = 0; | |
dc00809a | 896 | spin_lock(&cs->req->waitq.lock); |
825d6d33 | 897 | if (test_bit(FR_ABORTED, &cs->req->flags)) |
ce534fb0 MS |
898 | err = -ENOENT; |
899 | else | |
900 | *pagep = newpage; | |
dc00809a | 901 | spin_unlock(&cs->req->waitq.lock); |
ce534fb0 MS |
902 | |
903 | if (err) { | |
904 | unlock_page(newpage); | |
905 | page_cache_release(newpage); | |
906 | return err; | |
907 | } | |
908 | ||
909 | unlock_page(oldpage); | |
910 | page_cache_release(oldpage); | |
911 | cs->len = 0; | |
912 | ||
913 | return 0; | |
914 | ||
915 | out_fallback_unlock: | |
916 | unlock_page(newpage); | |
917 | out_fallback: | |
c55a01d3 MS |
918 | cs->pg = buf->page; |
919 | cs->offset = buf->offset; | |
ce534fb0 | 920 | |
dc00809a | 921 | err = lock_request(cs->req); |
ce534fb0 MS |
922 | if (err) |
923 | return err; | |
924 | ||
925 | return 1; | |
926 | } | |
927 | ||
c3021629 MS |
928 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
929 | unsigned offset, unsigned count) | |
930 | { | |
931 | struct pipe_buffer *buf; | |
0d8e84b0 | 932 | int err; |
c3021629 MS |
933 | |
934 | if (cs->nr_segs == cs->pipe->buffers) | |
935 | return -EIO; | |
936 | ||
dc00809a | 937 | err = unlock_request(cs->req); |
0d8e84b0 MS |
938 | if (err) |
939 | return err; | |
940 | ||
c3021629 MS |
941 | fuse_copy_finish(cs); |
942 | ||
943 | buf = cs->pipebufs; | |
944 | page_cache_get(page); | |
945 | buf->page = page; | |
946 | buf->offset = offset; | |
947 | buf->len = count; | |
948 | ||
949 | cs->pipebufs++; | |
950 | cs->nr_segs++; | |
951 | cs->len = 0; | |
952 | ||
953 | return 0; | |
954 | } | |
955 | ||
334f485d MS |
956 | /* |
957 | * Copy a page in the request to/from the userspace buffer. Must be | |
958 | * done atomically | |
959 | */ | |
ce534fb0 | 960 | static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep, |
8bfc016d | 961 | unsigned offset, unsigned count, int zeroing) |
334f485d | 962 | { |
ce534fb0 MS |
963 | int err; |
964 | struct page *page = *pagep; | |
965 | ||
b6777c40 MS |
966 | if (page && zeroing && count < PAGE_SIZE) |
967 | clear_highpage(page); | |
968 | ||
334f485d | 969 | while (count) { |
c3021629 MS |
970 | if (cs->write && cs->pipebufs && page) { |
971 | return fuse_ref_page(cs, page, offset, count); | |
972 | } else if (!cs->len) { | |
ce534fb0 MS |
973 | if (cs->move_pages && page && |
974 | offset == 0 && count == PAGE_SIZE) { | |
975 | err = fuse_try_move_page(cs, pagep); | |
976 | if (err <= 0) | |
977 | return err; | |
978 | } else { | |
979 | err = fuse_copy_fill(cs); | |
980 | if (err) | |
981 | return err; | |
982 | } | |
1729a16c | 983 | } |
334f485d | 984 | if (page) { |
2408f6ef | 985 | void *mapaddr = kmap_atomic(page); |
334f485d MS |
986 | void *buf = mapaddr + offset; |
987 | offset += fuse_copy_do(cs, &buf, &count); | |
2408f6ef | 988 | kunmap_atomic(mapaddr); |
334f485d MS |
989 | } else |
990 | offset += fuse_copy_do(cs, NULL, &count); | |
991 | } | |
992 | if (page && !cs->write) | |
993 | flush_dcache_page(page); | |
994 | return 0; | |
995 | } | |
996 | ||
997 | /* Copy pages in the request to/from userspace buffer */ | |
998 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, | |
999 | int zeroing) | |
1000 | { | |
1001 | unsigned i; | |
1002 | struct fuse_req *req = cs->req; | |
334f485d MS |
1003 | |
1004 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { | |
ce534fb0 | 1005 | int err; |
85f40aec MP |
1006 | unsigned offset = req->page_descs[i].offset; |
1007 | unsigned count = min(nbytes, req->page_descs[i].length); | |
ce534fb0 MS |
1008 | |
1009 | err = fuse_copy_page(cs, &req->pages[i], offset, count, | |
1010 | zeroing); | |
334f485d MS |
1011 | if (err) |
1012 | return err; | |
1013 | ||
1014 | nbytes -= count; | |
334f485d MS |
1015 | } |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /* Copy a single argument in the request to/from userspace buffer */ | |
1020 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) | |
1021 | { | |
1022 | while (size) { | |
1729a16c MS |
1023 | if (!cs->len) { |
1024 | int err = fuse_copy_fill(cs); | |
1025 | if (err) | |
1026 | return err; | |
1027 | } | |
334f485d MS |
1028 | fuse_copy_do(cs, &val, &size); |
1029 | } | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | /* Copy request arguments to/from userspace buffer */ | |
1034 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, | |
1035 | unsigned argpages, struct fuse_arg *args, | |
1036 | int zeroing) | |
1037 | { | |
1038 | int err = 0; | |
1039 | unsigned i; | |
1040 | ||
1041 | for (i = 0; !err && i < numargs; i++) { | |
1042 | struct fuse_arg *arg = &args[i]; | |
1043 | if (i == numargs - 1 && argpages) | |
1044 | err = fuse_copy_pages(cs, arg->size, zeroing); | |
1045 | else | |
1046 | err = fuse_copy_one(cs, arg->value, arg->size); | |
1047 | } | |
1048 | return err; | |
1049 | } | |
1050 | ||
07e77dca MS |
1051 | static int forget_pending(struct fuse_conn *fc) |
1052 | { | |
1053 | return fc->forget_list_head.next != NULL; | |
1054 | } | |
1055 | ||
a4d27e75 MS |
1056 | static int request_pending(struct fuse_conn *fc) |
1057 | { | |
07e77dca MS |
1058 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) || |
1059 | forget_pending(fc); | |
a4d27e75 MS |
1060 | } |
1061 | ||
334f485d MS |
1062 | /* Wait until a request is available on the pending list */ |
1063 | static void request_wait(struct fuse_conn *fc) | |
b9ca67b2 MS |
1064 | __releases(fc->lock) |
1065 | __acquires(fc->lock) | |
334f485d MS |
1066 | { |
1067 | DECLARE_WAITQUEUE(wait, current); | |
1068 | ||
1069 | add_wait_queue_exclusive(&fc->waitq, &wait); | |
a4d27e75 | 1070 | while (fc->connected && !request_pending(fc)) { |
334f485d MS |
1071 | set_current_state(TASK_INTERRUPTIBLE); |
1072 | if (signal_pending(current)) | |
1073 | break; | |
1074 | ||
d7133114 | 1075 | spin_unlock(&fc->lock); |
334f485d | 1076 | schedule(); |
d7133114 | 1077 | spin_lock(&fc->lock); |
334f485d MS |
1078 | } |
1079 | set_current_state(TASK_RUNNING); | |
1080 | remove_wait_queue(&fc->waitq, &wait); | |
1081 | } | |
1082 | ||
a4d27e75 MS |
1083 | /* |
1084 | * Transfer an interrupt request to userspace | |
1085 | * | |
1086 | * Unlike other requests this is assembled on demand, without a need | |
1087 | * to allocate a separate fuse_req structure. | |
1088 | * | |
1089 | * Called with fc->lock held, releases it | |
1090 | */ | |
c3021629 MS |
1091 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs, |
1092 | size_t nbytes, struct fuse_req *req) | |
b9ca67b2 | 1093 | __releases(fc->lock) |
a4d27e75 | 1094 | { |
a4d27e75 MS |
1095 | struct fuse_in_header ih; |
1096 | struct fuse_interrupt_in arg; | |
1097 | unsigned reqsize = sizeof(ih) + sizeof(arg); | |
1098 | int err; | |
1099 | ||
1100 | list_del_init(&req->intr_entry); | |
1101 | req->intr_unique = fuse_get_unique(fc); | |
1102 | memset(&ih, 0, sizeof(ih)); | |
1103 | memset(&arg, 0, sizeof(arg)); | |
1104 | ih.len = reqsize; | |
1105 | ih.opcode = FUSE_INTERRUPT; | |
1106 | ih.unique = req->intr_unique; | |
1107 | arg.unique = req->in.h.unique; | |
1108 | ||
1109 | spin_unlock(&fc->lock); | |
c3021629 | 1110 | if (nbytes < reqsize) |
a4d27e75 MS |
1111 | return -EINVAL; |
1112 | ||
c3021629 | 1113 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
a4d27e75 | 1114 | if (!err) |
c3021629 MS |
1115 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
1116 | fuse_copy_finish(cs); | |
a4d27e75 MS |
1117 | |
1118 | return err ? err : reqsize; | |
1119 | } | |
1120 | ||
02c048b9 MS |
1121 | static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc, |
1122 | unsigned max, | |
1123 | unsigned *countp) | |
07e77dca | 1124 | { |
02c048b9 MS |
1125 | struct fuse_forget_link *head = fc->forget_list_head.next; |
1126 | struct fuse_forget_link **newhead = &head; | |
1127 | unsigned count; | |
07e77dca | 1128 | |
02c048b9 MS |
1129 | for (count = 0; *newhead != NULL && count < max; count++) |
1130 | newhead = &(*newhead)->next; | |
1131 | ||
1132 | fc->forget_list_head.next = *newhead; | |
1133 | *newhead = NULL; | |
07e77dca MS |
1134 | if (fc->forget_list_head.next == NULL) |
1135 | fc->forget_list_tail = &fc->forget_list_head; | |
1136 | ||
02c048b9 MS |
1137 | if (countp != NULL) |
1138 | *countp = count; | |
1139 | ||
1140 | return head; | |
07e77dca MS |
1141 | } |
1142 | ||
1143 | static int fuse_read_single_forget(struct fuse_conn *fc, | |
1144 | struct fuse_copy_state *cs, | |
1145 | size_t nbytes) | |
1146 | __releases(fc->lock) | |
1147 | { | |
1148 | int err; | |
02c048b9 | 1149 | struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL); |
07e77dca | 1150 | struct fuse_forget_in arg = { |
02c048b9 | 1151 | .nlookup = forget->forget_one.nlookup, |
07e77dca MS |
1152 | }; |
1153 | struct fuse_in_header ih = { | |
1154 | .opcode = FUSE_FORGET, | |
02c048b9 | 1155 | .nodeid = forget->forget_one.nodeid, |
07e77dca MS |
1156 | .unique = fuse_get_unique(fc), |
1157 | .len = sizeof(ih) + sizeof(arg), | |
1158 | }; | |
1159 | ||
1160 | spin_unlock(&fc->lock); | |
1161 | kfree(forget); | |
1162 | if (nbytes < ih.len) | |
1163 | return -EINVAL; | |
1164 | ||
1165 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1166 | if (!err) | |
1167 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1168 | fuse_copy_finish(cs); | |
1169 | ||
1170 | if (err) | |
1171 | return err; | |
1172 | ||
1173 | return ih.len; | |
1174 | } | |
1175 | ||
02c048b9 MS |
1176 | static int fuse_read_batch_forget(struct fuse_conn *fc, |
1177 | struct fuse_copy_state *cs, size_t nbytes) | |
1178 | __releases(fc->lock) | |
1179 | { | |
1180 | int err; | |
1181 | unsigned max_forgets; | |
1182 | unsigned count; | |
1183 | struct fuse_forget_link *head; | |
1184 | struct fuse_batch_forget_in arg = { .count = 0 }; | |
1185 | struct fuse_in_header ih = { | |
1186 | .opcode = FUSE_BATCH_FORGET, | |
1187 | .unique = fuse_get_unique(fc), | |
1188 | .len = sizeof(ih) + sizeof(arg), | |
1189 | }; | |
1190 | ||
1191 | if (nbytes < ih.len) { | |
1192 | spin_unlock(&fc->lock); | |
1193 | return -EINVAL; | |
1194 | } | |
1195 | ||
1196 | max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one); | |
1197 | head = dequeue_forget(fc, max_forgets, &count); | |
1198 | spin_unlock(&fc->lock); | |
1199 | ||
1200 | arg.count = count; | |
1201 | ih.len += count * sizeof(struct fuse_forget_one); | |
1202 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1203 | if (!err) | |
1204 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1205 | ||
1206 | while (head) { | |
1207 | struct fuse_forget_link *forget = head; | |
1208 | ||
1209 | if (!err) { | |
1210 | err = fuse_copy_one(cs, &forget->forget_one, | |
1211 | sizeof(forget->forget_one)); | |
1212 | } | |
1213 | head = forget->next; | |
1214 | kfree(forget); | |
1215 | } | |
1216 | ||
1217 | fuse_copy_finish(cs); | |
1218 | ||
1219 | if (err) | |
1220 | return err; | |
1221 | ||
1222 | return ih.len; | |
1223 | } | |
1224 | ||
1225 | static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs, | |
1226 | size_t nbytes) | |
1227 | __releases(fc->lock) | |
1228 | { | |
1229 | if (fc->minor < 16 || fc->forget_list_head.next->next == NULL) | |
1230 | return fuse_read_single_forget(fc, cs, nbytes); | |
1231 | else | |
1232 | return fuse_read_batch_forget(fc, cs, nbytes); | |
1233 | } | |
1234 | ||
334f485d MS |
1235 | /* |
1236 | * Read a single request into the userspace filesystem's buffer. This | |
1237 | * function waits until a request is available, then removes it from | |
1238 | * the pending list and copies request data to userspace buffer. If | |
f9a2842e MS |
1239 | * no reply is needed (FORGET) or request has been aborted or there |
1240 | * was an error during the copying then it's finished by calling | |
334f485d MS |
1241 | * request_end(). Otherwise add it to the processing list, and set |
1242 | * the 'sent' flag. | |
1243 | */ | |
c3021629 MS |
1244 | static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, |
1245 | struct fuse_copy_state *cs, size_t nbytes) | |
334f485d MS |
1246 | { |
1247 | int err; | |
334f485d MS |
1248 | struct fuse_req *req; |
1249 | struct fuse_in *in; | |
334f485d MS |
1250 | unsigned reqsize; |
1251 | ||
1d3d752b | 1252 | restart: |
d7133114 | 1253 | spin_lock(&fc->lock); |
e5ac1d1e JD |
1254 | err = -EAGAIN; |
1255 | if ((file->f_flags & O_NONBLOCK) && fc->connected && | |
a4d27e75 | 1256 | !request_pending(fc)) |
e5ac1d1e JD |
1257 | goto err_unlock; |
1258 | ||
334f485d MS |
1259 | request_wait(fc); |
1260 | err = -ENODEV; | |
9ba7cbba | 1261 | if (!fc->connected) |
334f485d MS |
1262 | goto err_unlock; |
1263 | err = -ERESTARTSYS; | |
a4d27e75 | 1264 | if (!request_pending(fc)) |
334f485d MS |
1265 | goto err_unlock; |
1266 | ||
a4d27e75 MS |
1267 | if (!list_empty(&fc->interrupts)) { |
1268 | req = list_entry(fc->interrupts.next, struct fuse_req, | |
1269 | intr_entry); | |
c3021629 | 1270 | return fuse_read_interrupt(fc, cs, nbytes, req); |
a4d27e75 MS |
1271 | } |
1272 | ||
07e77dca MS |
1273 | if (forget_pending(fc)) { |
1274 | if (list_empty(&fc->pending) || fc->forget_batch-- > 0) | |
02c048b9 | 1275 | return fuse_read_forget(fc, cs, nbytes); |
07e77dca MS |
1276 | |
1277 | if (fc->forget_batch <= -8) | |
1278 | fc->forget_batch = 16; | |
1279 | } | |
1280 | ||
334f485d | 1281 | req = list_entry(fc->pending.next, struct fuse_req, list); |
83cfd493 | 1282 | req->state = FUSE_REQ_READING; |
d77a1d5b | 1283 | list_move(&req->list, &fc->io); |
334f485d MS |
1284 | |
1285 | in = &req->in; | |
1d3d752b MS |
1286 | reqsize = in->h.len; |
1287 | /* If request is too large, reply with an error and restart the read */ | |
c3021629 | 1288 | if (nbytes < reqsize) { |
1d3d752b MS |
1289 | req->out.h.error = -EIO; |
1290 | /* SETXATTR is special, since it may contain too large data */ | |
1291 | if (in->h.opcode == FUSE_SETXATTR) | |
1292 | req->out.h.error = -E2BIG; | |
1293 | request_end(fc, req); | |
1294 | goto restart; | |
334f485d | 1295 | } |
d7133114 | 1296 | spin_unlock(&fc->lock); |
c3021629 MS |
1297 | cs->req = req; |
1298 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); | |
1d3d752b | 1299 | if (!err) |
c3021629 | 1300 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
1d3d752b | 1301 | (struct fuse_arg *) in->args, 0); |
c3021629 | 1302 | fuse_copy_finish(cs); |
d7133114 | 1303 | spin_lock(&fc->lock); |
825d6d33 | 1304 | clear_bit(FR_LOCKED, &req->flags); |
0d8e84b0 | 1305 | if (!fc->connected) { |
c9c9d7df MS |
1306 | request_end(fc, req); |
1307 | return -ENODEV; | |
1308 | } | |
334f485d | 1309 | if (err) { |
c9c9d7df | 1310 | req->out.h.error = -EIO; |
334f485d MS |
1311 | request_end(fc, req); |
1312 | return err; | |
1313 | } | |
825d6d33 | 1314 | if (!test_bit(FR_ISREPLY, &req->flags)) { |
334f485d | 1315 | request_end(fc, req); |
825d6d33 | 1316 | } else { |
83cfd493 | 1317 | req->state = FUSE_REQ_SENT; |
d77a1d5b | 1318 | list_move_tail(&req->list, &fc->processing); |
825d6d33 | 1319 | if (test_bit(FR_INTERRUPTED, &req->flags)) |
a4d27e75 | 1320 | queue_interrupt(fc, req); |
d7133114 | 1321 | spin_unlock(&fc->lock); |
334f485d MS |
1322 | } |
1323 | return reqsize; | |
1324 | ||
1325 | err_unlock: | |
d7133114 | 1326 | spin_unlock(&fc->lock); |
334f485d MS |
1327 | return err; |
1328 | } | |
1329 | ||
94e4fe2c TVB |
1330 | static int fuse_dev_open(struct inode *inode, struct file *file) |
1331 | { | |
1332 | /* | |
1333 | * The fuse device's file's private_data is used to hold | |
1334 | * the fuse_conn(ection) when it is mounted, and is used to | |
1335 | * keep track of whether the file has been mounted already. | |
1336 | */ | |
1337 | file->private_data = NULL; | |
1338 | return 0; | |
1339 | } | |
1340 | ||
fbdbacca | 1341 | static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to) |
c3021629 MS |
1342 | { |
1343 | struct fuse_copy_state cs; | |
1344 | struct file *file = iocb->ki_filp; | |
1345 | struct fuse_conn *fc = fuse_get_conn(file); | |
1346 | if (!fc) | |
1347 | return -EPERM; | |
1348 | ||
fbdbacca AV |
1349 | if (!iter_is_iovec(to)) |
1350 | return -EINVAL; | |
1351 | ||
dc00809a | 1352 | fuse_copy_init(&cs, 1, to); |
c3021629 | 1353 | |
fbdbacca | 1354 | return fuse_dev_do_read(fc, file, &cs, iov_iter_count(to)); |
c3021629 MS |
1355 | } |
1356 | ||
c3021629 MS |
1357 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, |
1358 | struct pipe_inode_info *pipe, | |
1359 | size_t len, unsigned int flags) | |
1360 | { | |
1361 | int ret; | |
1362 | int page_nr = 0; | |
1363 | int do_wakeup = 0; | |
1364 | struct pipe_buffer *bufs; | |
1365 | struct fuse_copy_state cs; | |
1366 | struct fuse_conn *fc = fuse_get_conn(in); | |
1367 | if (!fc) | |
1368 | return -EPERM; | |
1369 | ||
07e77dca | 1370 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
c3021629 MS |
1371 | if (!bufs) |
1372 | return -ENOMEM; | |
1373 | ||
dc00809a | 1374 | fuse_copy_init(&cs, 1, NULL); |
c3021629 MS |
1375 | cs.pipebufs = bufs; |
1376 | cs.pipe = pipe; | |
1377 | ret = fuse_dev_do_read(fc, in, &cs, len); | |
1378 | if (ret < 0) | |
1379 | goto out; | |
1380 | ||
1381 | ret = 0; | |
1382 | pipe_lock(pipe); | |
1383 | ||
1384 | if (!pipe->readers) { | |
1385 | send_sig(SIGPIPE, current, 0); | |
1386 | if (!ret) | |
1387 | ret = -EPIPE; | |
1388 | goto out_unlock; | |
1389 | } | |
1390 | ||
1391 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { | |
1392 | ret = -EIO; | |
1393 | goto out_unlock; | |
1394 | } | |
1395 | ||
1396 | while (page_nr < cs.nr_segs) { | |
1397 | int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); | |
1398 | struct pipe_buffer *buf = pipe->bufs + newbuf; | |
1399 | ||
1400 | buf->page = bufs[page_nr].page; | |
1401 | buf->offset = bufs[page_nr].offset; | |
1402 | buf->len = bufs[page_nr].len; | |
28a625cb MS |
1403 | /* |
1404 | * Need to be careful about this. Having buf->ops in module | |
1405 | * code can Oops if the buffer persists after module unload. | |
1406 | */ | |
1407 | buf->ops = &nosteal_pipe_buf_ops; | |
c3021629 MS |
1408 | |
1409 | pipe->nrbufs++; | |
1410 | page_nr++; | |
1411 | ret += buf->len; | |
1412 | ||
6447a3cf | 1413 | if (pipe->files) |
c3021629 MS |
1414 | do_wakeup = 1; |
1415 | } | |
1416 | ||
1417 | out_unlock: | |
1418 | pipe_unlock(pipe); | |
1419 | ||
1420 | if (do_wakeup) { | |
1421 | smp_mb(); | |
1422 | if (waitqueue_active(&pipe->wait)) | |
1423 | wake_up_interruptible(&pipe->wait); | |
1424 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); | |
1425 | } | |
1426 | ||
1427 | out: | |
1428 | for (; page_nr < cs.nr_segs; page_nr++) | |
1429 | page_cache_release(bufs[page_nr].page); | |
1430 | ||
1431 | kfree(bufs); | |
1432 | return ret; | |
1433 | } | |
1434 | ||
95668a69 TH |
1435 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
1436 | struct fuse_copy_state *cs) | |
1437 | { | |
1438 | struct fuse_notify_poll_wakeup_out outarg; | |
f6d47a17 | 1439 | int err = -EINVAL; |
95668a69 TH |
1440 | |
1441 | if (size != sizeof(outarg)) | |
f6d47a17 | 1442 | goto err; |
95668a69 TH |
1443 | |
1444 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1445 | if (err) | |
f6d47a17 | 1446 | goto err; |
95668a69 | 1447 | |
f6d47a17 | 1448 | fuse_copy_finish(cs); |
95668a69 | 1449 | return fuse_notify_poll_wakeup(fc, &outarg); |
f6d47a17 MS |
1450 | |
1451 | err: | |
1452 | fuse_copy_finish(cs); | |
1453 | return err; | |
95668a69 TH |
1454 | } |
1455 | ||
3b463ae0 JM |
1456 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
1457 | struct fuse_copy_state *cs) | |
1458 | { | |
1459 | struct fuse_notify_inval_inode_out outarg; | |
1460 | int err = -EINVAL; | |
1461 | ||
1462 | if (size != sizeof(outarg)) | |
1463 | goto err; | |
1464 | ||
1465 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1466 | if (err) | |
1467 | goto err; | |
1468 | fuse_copy_finish(cs); | |
1469 | ||
1470 | down_read(&fc->killsb); | |
1471 | err = -ENOENT; | |
b21dda43 MS |
1472 | if (fc->sb) { |
1473 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, | |
1474 | outarg.off, outarg.len); | |
1475 | } | |
3b463ae0 JM |
1476 | up_read(&fc->killsb); |
1477 | return err; | |
1478 | ||
1479 | err: | |
1480 | fuse_copy_finish(cs); | |
1481 | return err; | |
1482 | } | |
1483 | ||
1484 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, | |
1485 | struct fuse_copy_state *cs) | |
1486 | { | |
1487 | struct fuse_notify_inval_entry_out outarg; | |
b2d82ee3 FW |
1488 | int err = -ENOMEM; |
1489 | char *buf; | |
3b463ae0 JM |
1490 | struct qstr name; |
1491 | ||
b2d82ee3 FW |
1492 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
1493 | if (!buf) | |
1494 | goto err; | |
1495 | ||
1496 | err = -EINVAL; | |
3b463ae0 JM |
1497 | if (size < sizeof(outarg)) |
1498 | goto err; | |
1499 | ||
1500 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1501 | if (err) | |
1502 | goto err; | |
1503 | ||
1504 | err = -ENAMETOOLONG; | |
1505 | if (outarg.namelen > FUSE_NAME_MAX) | |
1506 | goto err; | |
1507 | ||
c2183d1e MS |
1508 | err = -EINVAL; |
1509 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1510 | goto err; | |
1511 | ||
3b463ae0 JM |
1512 | name.name = buf; |
1513 | name.len = outarg.namelen; | |
1514 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1515 | if (err) | |
1516 | goto err; | |
1517 | fuse_copy_finish(cs); | |
1518 | buf[outarg.namelen] = 0; | |
1519 | name.hash = full_name_hash(name.name, name.len); | |
1520 | ||
1521 | down_read(&fc->killsb); | |
1522 | err = -ENOENT; | |
b21dda43 | 1523 | if (fc->sb) |
451d0f59 JM |
1524 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name); |
1525 | up_read(&fc->killsb); | |
1526 | kfree(buf); | |
1527 | return err; | |
1528 | ||
1529 | err: | |
1530 | kfree(buf); | |
1531 | fuse_copy_finish(cs); | |
1532 | return err; | |
1533 | } | |
1534 | ||
1535 | static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size, | |
1536 | struct fuse_copy_state *cs) | |
1537 | { | |
1538 | struct fuse_notify_delete_out outarg; | |
1539 | int err = -ENOMEM; | |
1540 | char *buf; | |
1541 | struct qstr name; | |
1542 | ||
1543 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); | |
1544 | if (!buf) | |
1545 | goto err; | |
1546 | ||
1547 | err = -EINVAL; | |
1548 | if (size < sizeof(outarg)) | |
1549 | goto err; | |
1550 | ||
1551 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1552 | if (err) | |
1553 | goto err; | |
1554 | ||
1555 | err = -ENAMETOOLONG; | |
1556 | if (outarg.namelen > FUSE_NAME_MAX) | |
1557 | goto err; | |
1558 | ||
1559 | err = -EINVAL; | |
1560 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1561 | goto err; | |
1562 | ||
1563 | name.name = buf; | |
1564 | name.len = outarg.namelen; | |
1565 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1566 | if (err) | |
1567 | goto err; | |
1568 | fuse_copy_finish(cs); | |
1569 | buf[outarg.namelen] = 0; | |
1570 | name.hash = full_name_hash(name.name, name.len); | |
1571 | ||
1572 | down_read(&fc->killsb); | |
1573 | err = -ENOENT; | |
1574 | if (fc->sb) | |
1575 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, | |
1576 | outarg.child, &name); | |
3b463ae0 | 1577 | up_read(&fc->killsb); |
b2d82ee3 | 1578 | kfree(buf); |
3b463ae0 JM |
1579 | return err; |
1580 | ||
1581 | err: | |
b2d82ee3 | 1582 | kfree(buf); |
3b463ae0 JM |
1583 | fuse_copy_finish(cs); |
1584 | return err; | |
1585 | } | |
1586 | ||
a1d75f25 MS |
1587 | static int fuse_notify_store(struct fuse_conn *fc, unsigned int size, |
1588 | struct fuse_copy_state *cs) | |
1589 | { | |
1590 | struct fuse_notify_store_out outarg; | |
1591 | struct inode *inode; | |
1592 | struct address_space *mapping; | |
1593 | u64 nodeid; | |
1594 | int err; | |
1595 | pgoff_t index; | |
1596 | unsigned int offset; | |
1597 | unsigned int num; | |
1598 | loff_t file_size; | |
1599 | loff_t end; | |
1600 | ||
1601 | err = -EINVAL; | |
1602 | if (size < sizeof(outarg)) | |
1603 | goto out_finish; | |
1604 | ||
1605 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1606 | if (err) | |
1607 | goto out_finish; | |
1608 | ||
1609 | err = -EINVAL; | |
1610 | if (size - sizeof(outarg) != outarg.size) | |
1611 | goto out_finish; | |
1612 | ||
1613 | nodeid = outarg.nodeid; | |
1614 | ||
1615 | down_read(&fc->killsb); | |
1616 | ||
1617 | err = -ENOENT; | |
1618 | if (!fc->sb) | |
1619 | goto out_up_killsb; | |
1620 | ||
1621 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1622 | if (!inode) | |
1623 | goto out_up_killsb; | |
1624 | ||
1625 | mapping = inode->i_mapping; | |
1626 | index = outarg.offset >> PAGE_CACHE_SHIFT; | |
1627 | offset = outarg.offset & ~PAGE_CACHE_MASK; | |
1628 | file_size = i_size_read(inode); | |
1629 | end = outarg.offset + outarg.size; | |
1630 | if (end > file_size) { | |
1631 | file_size = end; | |
1632 | fuse_write_update_size(inode, file_size); | |
1633 | } | |
1634 | ||
1635 | num = outarg.size; | |
1636 | while (num) { | |
1637 | struct page *page; | |
1638 | unsigned int this_num; | |
1639 | ||
1640 | err = -ENOMEM; | |
1641 | page = find_or_create_page(mapping, index, | |
1642 | mapping_gfp_mask(mapping)); | |
1643 | if (!page) | |
1644 | goto out_iput; | |
1645 | ||
1646 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); | |
1647 | err = fuse_copy_page(cs, &page, offset, this_num, 0); | |
063ec1e5 MS |
1648 | if (!err && offset == 0 && |
1649 | (this_num == PAGE_CACHE_SIZE || file_size == end)) | |
a1d75f25 MS |
1650 | SetPageUptodate(page); |
1651 | unlock_page(page); | |
1652 | page_cache_release(page); | |
1653 | ||
1654 | if (err) | |
1655 | goto out_iput; | |
1656 | ||
1657 | num -= this_num; | |
1658 | offset = 0; | |
1659 | index++; | |
1660 | } | |
1661 | ||
1662 | err = 0; | |
1663 | ||
1664 | out_iput: | |
1665 | iput(inode); | |
1666 | out_up_killsb: | |
1667 | up_read(&fc->killsb); | |
1668 | out_finish: | |
1669 | fuse_copy_finish(cs); | |
1670 | return err; | |
1671 | } | |
1672 | ||
2d45ba38 MS |
1673 | static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req) |
1674 | { | |
b745bc85 | 1675 | release_pages(req->pages, req->num_pages, false); |
2d45ba38 MS |
1676 | } |
1677 | ||
1678 | static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode, | |
1679 | struct fuse_notify_retrieve_out *outarg) | |
1680 | { | |
1681 | int err; | |
1682 | struct address_space *mapping = inode->i_mapping; | |
1683 | struct fuse_req *req; | |
1684 | pgoff_t index; | |
1685 | loff_t file_size; | |
1686 | unsigned int num; | |
1687 | unsigned int offset; | |
0157443c | 1688 | size_t total_len = 0; |
4d53dc99 | 1689 | int num_pages; |
2d45ba38 | 1690 | |
4d53dc99 MP |
1691 | offset = outarg->offset & ~PAGE_CACHE_MASK; |
1692 | file_size = i_size_read(inode); | |
1693 | ||
1694 | num = outarg->size; | |
1695 | if (outarg->offset > file_size) | |
1696 | num = 0; | |
1697 | else if (outarg->offset + num > file_size) | |
1698 | num = file_size - outarg->offset; | |
1699 | ||
1700 | num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
1701 | num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ); | |
1702 | ||
1703 | req = fuse_get_req(fc, num_pages); | |
2d45ba38 MS |
1704 | if (IS_ERR(req)) |
1705 | return PTR_ERR(req); | |
1706 | ||
2d45ba38 MS |
1707 | req->in.h.opcode = FUSE_NOTIFY_REPLY; |
1708 | req->in.h.nodeid = outarg->nodeid; | |
1709 | req->in.numargs = 2; | |
1710 | req->in.argpages = 1; | |
b2430d75 | 1711 | req->page_descs[0].offset = offset; |
2d45ba38 MS |
1712 | req->end = fuse_retrieve_end; |
1713 | ||
1714 | index = outarg->offset >> PAGE_CACHE_SHIFT; | |
2d45ba38 | 1715 | |
4d53dc99 | 1716 | while (num && req->num_pages < num_pages) { |
2d45ba38 MS |
1717 | struct page *page; |
1718 | unsigned int this_num; | |
1719 | ||
1720 | page = find_get_page(mapping, index); | |
1721 | if (!page) | |
1722 | break; | |
1723 | ||
1724 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); | |
1725 | req->pages[req->num_pages] = page; | |
85f40aec | 1726 | req->page_descs[req->num_pages].length = this_num; |
2d45ba38 MS |
1727 | req->num_pages++; |
1728 | ||
c9e67d48 | 1729 | offset = 0; |
2d45ba38 MS |
1730 | num -= this_num; |
1731 | total_len += this_num; | |
48706d0a | 1732 | index++; |
2d45ba38 MS |
1733 | } |
1734 | req->misc.retrieve_in.offset = outarg->offset; | |
1735 | req->misc.retrieve_in.size = total_len; | |
1736 | req->in.args[0].size = sizeof(req->misc.retrieve_in); | |
1737 | req->in.args[0].value = &req->misc.retrieve_in; | |
1738 | req->in.args[1].size = total_len; | |
1739 | ||
1740 | err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique); | |
1741 | if (err) | |
1742 | fuse_retrieve_end(fc, req); | |
1743 | ||
1744 | return err; | |
1745 | } | |
1746 | ||
1747 | static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size, | |
1748 | struct fuse_copy_state *cs) | |
1749 | { | |
1750 | struct fuse_notify_retrieve_out outarg; | |
1751 | struct inode *inode; | |
1752 | int err; | |
1753 | ||
1754 | err = -EINVAL; | |
1755 | if (size != sizeof(outarg)) | |
1756 | goto copy_finish; | |
1757 | ||
1758 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1759 | if (err) | |
1760 | goto copy_finish; | |
1761 | ||
1762 | fuse_copy_finish(cs); | |
1763 | ||
1764 | down_read(&fc->killsb); | |
1765 | err = -ENOENT; | |
1766 | if (fc->sb) { | |
1767 | u64 nodeid = outarg.nodeid; | |
1768 | ||
1769 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1770 | if (inode) { | |
1771 | err = fuse_retrieve(fc, inode, &outarg); | |
1772 | iput(inode); | |
1773 | } | |
1774 | } | |
1775 | up_read(&fc->killsb); | |
1776 | ||
1777 | return err; | |
1778 | ||
1779 | copy_finish: | |
1780 | fuse_copy_finish(cs); | |
1781 | return err; | |
1782 | } | |
1783 | ||
8599396b TH |
1784 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
1785 | unsigned int size, struct fuse_copy_state *cs) | |
1786 | { | |
0d278362 MS |
1787 | /* Don't try to move pages (yet) */ |
1788 | cs->move_pages = 0; | |
1789 | ||
8599396b | 1790 | switch (code) { |
95668a69 TH |
1791 | case FUSE_NOTIFY_POLL: |
1792 | return fuse_notify_poll(fc, size, cs); | |
1793 | ||
3b463ae0 JM |
1794 | case FUSE_NOTIFY_INVAL_INODE: |
1795 | return fuse_notify_inval_inode(fc, size, cs); | |
1796 | ||
1797 | case FUSE_NOTIFY_INVAL_ENTRY: | |
1798 | return fuse_notify_inval_entry(fc, size, cs); | |
1799 | ||
a1d75f25 MS |
1800 | case FUSE_NOTIFY_STORE: |
1801 | return fuse_notify_store(fc, size, cs); | |
1802 | ||
2d45ba38 MS |
1803 | case FUSE_NOTIFY_RETRIEVE: |
1804 | return fuse_notify_retrieve(fc, size, cs); | |
1805 | ||
451d0f59 JM |
1806 | case FUSE_NOTIFY_DELETE: |
1807 | return fuse_notify_delete(fc, size, cs); | |
1808 | ||
8599396b | 1809 | default: |
f6d47a17 | 1810 | fuse_copy_finish(cs); |
8599396b TH |
1811 | return -EINVAL; |
1812 | } | |
1813 | } | |
1814 | ||
334f485d MS |
1815 | /* Look up request on processing list by unique ID */ |
1816 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) | |
1817 | { | |
05726aca | 1818 | struct fuse_req *req; |
334f485d | 1819 | |
05726aca | 1820 | list_for_each_entry(req, &fc->processing, list) { |
a4d27e75 | 1821 | if (req->in.h.unique == unique || req->intr_unique == unique) |
334f485d MS |
1822 | return req; |
1823 | } | |
1824 | return NULL; | |
1825 | } | |
1826 | ||
1827 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, | |
1828 | unsigned nbytes) | |
1829 | { | |
1830 | unsigned reqsize = sizeof(struct fuse_out_header); | |
1831 | ||
1832 | if (out->h.error) | |
1833 | return nbytes != reqsize ? -EINVAL : 0; | |
1834 | ||
1835 | reqsize += len_args(out->numargs, out->args); | |
1836 | ||
1837 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) | |
1838 | return -EINVAL; | |
1839 | else if (reqsize > nbytes) { | |
1840 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; | |
1841 | unsigned diffsize = reqsize - nbytes; | |
1842 | if (diffsize > lastarg->size) | |
1843 | return -EINVAL; | |
1844 | lastarg->size -= diffsize; | |
1845 | } | |
1846 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, | |
1847 | out->page_zeroing); | |
1848 | } | |
1849 | ||
1850 | /* | |
1851 | * Write a single reply to a request. First the header is copied from | |
1852 | * the write buffer. The request is then searched on the processing | |
1853 | * list by the unique ID found in the header. If found, then remove | |
1854 | * it from the list and copy the rest of the buffer to the request. | |
1855 | * The request is finished by calling request_end() | |
1856 | */ | |
dd3bb14f MS |
1857 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
1858 | struct fuse_copy_state *cs, size_t nbytes) | |
334f485d MS |
1859 | { |
1860 | int err; | |
334f485d MS |
1861 | struct fuse_req *req; |
1862 | struct fuse_out_header oh; | |
334f485d | 1863 | |
334f485d MS |
1864 | if (nbytes < sizeof(struct fuse_out_header)) |
1865 | return -EINVAL; | |
1866 | ||
dd3bb14f | 1867 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
334f485d MS |
1868 | if (err) |
1869 | goto err_finish; | |
8599396b TH |
1870 | |
1871 | err = -EINVAL; | |
1872 | if (oh.len != nbytes) | |
1873 | goto err_finish; | |
1874 | ||
1875 | /* | |
1876 | * Zero oh.unique indicates unsolicited notification message | |
1877 | * and error contains notification code. | |
1878 | */ | |
1879 | if (!oh.unique) { | |
dd3bb14f | 1880 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
8599396b TH |
1881 | return err ? err : nbytes; |
1882 | } | |
1883 | ||
334f485d | 1884 | err = -EINVAL; |
8599396b | 1885 | if (oh.error <= -1000 || oh.error > 0) |
334f485d MS |
1886 | goto err_finish; |
1887 | ||
d7133114 | 1888 | spin_lock(&fc->lock); |
69a53bf2 MS |
1889 | err = -ENOENT; |
1890 | if (!fc->connected) | |
1891 | goto err_unlock; | |
1892 | ||
334f485d | 1893 | req = request_find(fc, oh.unique); |
334f485d MS |
1894 | if (!req) |
1895 | goto err_unlock; | |
1896 | ||
a4d27e75 MS |
1897 | /* Is it an interrupt reply? */ |
1898 | if (req->intr_unique == oh.unique) { | |
1899 | err = -EINVAL; | |
1900 | if (nbytes != sizeof(struct fuse_out_header)) | |
1901 | goto err_unlock; | |
1902 | ||
1903 | if (oh.error == -ENOSYS) | |
1904 | fc->no_interrupt = 1; | |
1905 | else if (oh.error == -EAGAIN) | |
1906 | queue_interrupt(fc, req); | |
1907 | ||
1908 | spin_unlock(&fc->lock); | |
dd3bb14f | 1909 | fuse_copy_finish(cs); |
a4d27e75 MS |
1910 | return nbytes; |
1911 | } | |
1912 | ||
1913 | req->state = FUSE_REQ_WRITING; | |
d77a1d5b | 1914 | list_move(&req->list, &fc->io); |
334f485d | 1915 | req->out.h = oh; |
825d6d33 | 1916 | set_bit(FR_LOCKED, &req->flags); |
dd3bb14f | 1917 | cs->req = req; |
ce534fb0 MS |
1918 | if (!req->out.page_replace) |
1919 | cs->move_pages = 0; | |
d7133114 | 1920 | spin_unlock(&fc->lock); |
334f485d | 1921 | |
dd3bb14f MS |
1922 | err = copy_out_args(cs, &req->out, nbytes); |
1923 | fuse_copy_finish(cs); | |
334f485d | 1924 | |
d7133114 | 1925 | spin_lock(&fc->lock); |
825d6d33 | 1926 | clear_bit(FR_LOCKED, &req->flags); |
0d8e84b0 MS |
1927 | if (!fc->connected) |
1928 | err = -ENOENT; | |
1929 | else if (err) | |
334f485d MS |
1930 | req->out.h.error = -EIO; |
1931 | request_end(fc, req); | |
1932 | ||
1933 | return err ? err : nbytes; | |
1934 | ||
1935 | err_unlock: | |
d7133114 | 1936 | spin_unlock(&fc->lock); |
334f485d | 1937 | err_finish: |
dd3bb14f | 1938 | fuse_copy_finish(cs); |
334f485d MS |
1939 | return err; |
1940 | } | |
1941 | ||
fbdbacca | 1942 | static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from) |
dd3bb14f MS |
1943 | { |
1944 | struct fuse_copy_state cs; | |
1945 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); | |
1946 | if (!fc) | |
1947 | return -EPERM; | |
1948 | ||
fbdbacca AV |
1949 | if (!iter_is_iovec(from)) |
1950 | return -EINVAL; | |
1951 | ||
dc00809a | 1952 | fuse_copy_init(&cs, 0, from); |
dd3bb14f | 1953 | |
fbdbacca | 1954 | return fuse_dev_do_write(fc, &cs, iov_iter_count(from)); |
dd3bb14f MS |
1955 | } |
1956 | ||
1957 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, | |
1958 | struct file *out, loff_t *ppos, | |
1959 | size_t len, unsigned int flags) | |
1960 | { | |
1961 | unsigned nbuf; | |
1962 | unsigned idx; | |
1963 | struct pipe_buffer *bufs; | |
1964 | struct fuse_copy_state cs; | |
1965 | struct fuse_conn *fc; | |
1966 | size_t rem; | |
1967 | ssize_t ret; | |
1968 | ||
1969 | fc = fuse_get_conn(out); | |
1970 | if (!fc) | |
1971 | return -EPERM; | |
1972 | ||
07e77dca | 1973 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
dd3bb14f MS |
1974 | if (!bufs) |
1975 | return -ENOMEM; | |
1976 | ||
1977 | pipe_lock(pipe); | |
1978 | nbuf = 0; | |
1979 | rem = 0; | |
1980 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) | |
1981 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; | |
1982 | ||
1983 | ret = -EINVAL; | |
1984 | if (rem < len) { | |
1985 | pipe_unlock(pipe); | |
1986 | goto out; | |
1987 | } | |
1988 | ||
1989 | rem = len; | |
1990 | while (rem) { | |
1991 | struct pipe_buffer *ibuf; | |
1992 | struct pipe_buffer *obuf; | |
1993 | ||
1994 | BUG_ON(nbuf >= pipe->buffers); | |
1995 | BUG_ON(!pipe->nrbufs); | |
1996 | ibuf = &pipe->bufs[pipe->curbuf]; | |
1997 | obuf = &bufs[nbuf]; | |
1998 | ||
1999 | if (rem >= ibuf->len) { | |
2000 | *obuf = *ibuf; | |
2001 | ibuf->ops = NULL; | |
2002 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); | |
2003 | pipe->nrbufs--; | |
2004 | } else { | |
2005 | ibuf->ops->get(pipe, ibuf); | |
2006 | *obuf = *ibuf; | |
2007 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; | |
2008 | obuf->len = rem; | |
2009 | ibuf->offset += obuf->len; | |
2010 | ibuf->len -= obuf->len; | |
2011 | } | |
2012 | nbuf++; | |
2013 | rem -= obuf->len; | |
2014 | } | |
2015 | pipe_unlock(pipe); | |
2016 | ||
dc00809a | 2017 | fuse_copy_init(&cs, 0, NULL); |
dd3bb14f | 2018 | cs.pipebufs = bufs; |
6c09e94a | 2019 | cs.nr_segs = nbuf; |
dd3bb14f MS |
2020 | cs.pipe = pipe; |
2021 | ||
ce534fb0 MS |
2022 | if (flags & SPLICE_F_MOVE) |
2023 | cs.move_pages = 1; | |
2024 | ||
dd3bb14f MS |
2025 | ret = fuse_dev_do_write(fc, &cs, len); |
2026 | ||
2027 | for (idx = 0; idx < nbuf; idx++) { | |
2028 | struct pipe_buffer *buf = &bufs[idx]; | |
2029 | buf->ops->release(pipe, buf); | |
2030 | } | |
2031 | out: | |
2032 | kfree(bufs); | |
2033 | return ret; | |
2034 | } | |
2035 | ||
334f485d MS |
2036 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
2037 | { | |
334f485d | 2038 | unsigned mask = POLLOUT | POLLWRNORM; |
7025d9ad | 2039 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 2040 | if (!fc) |
7025d9ad | 2041 | return POLLERR; |
334f485d MS |
2042 | |
2043 | poll_wait(file, &fc->waitq, wait); | |
2044 | ||
d7133114 | 2045 | spin_lock(&fc->lock); |
7025d9ad MS |
2046 | if (!fc->connected) |
2047 | mask = POLLERR; | |
a4d27e75 | 2048 | else if (request_pending(fc)) |
7025d9ad | 2049 | mask |= POLLIN | POLLRDNORM; |
d7133114 | 2050 | spin_unlock(&fc->lock); |
334f485d MS |
2051 | |
2052 | return mask; | |
2053 | } | |
2054 | ||
69a53bf2 MS |
2055 | /* |
2056 | * Abort all requests on the given list (pending or processing) | |
2057 | * | |
d7133114 | 2058 | * This function releases and reacquires fc->lock |
69a53bf2 | 2059 | */ |
334f485d | 2060 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
b9ca67b2 MS |
2061 | __releases(fc->lock) |
2062 | __acquires(fc->lock) | |
334f485d MS |
2063 | { |
2064 | while (!list_empty(head)) { | |
2065 | struct fuse_req *req; | |
2066 | req = list_entry(head->next, struct fuse_req, list); | |
334f485d MS |
2067 | req->out.h.error = -ECONNABORTED; |
2068 | request_end(fc, req); | |
d7133114 | 2069 | spin_lock(&fc->lock); |
334f485d MS |
2070 | } |
2071 | } | |
2072 | ||
357ccf2b BG |
2073 | static void end_polls(struct fuse_conn *fc) |
2074 | { | |
2075 | struct rb_node *p; | |
2076 | ||
2077 | p = rb_first(&fc->polled_files); | |
2078 | ||
2079 | while (p) { | |
2080 | struct fuse_file *ff; | |
2081 | ff = rb_entry(p, struct fuse_file, polled_node); | |
2082 | wake_up_interruptible_all(&ff->poll_wait); | |
2083 | ||
2084 | p = rb_next(p); | |
2085 | } | |
2086 | } | |
2087 | ||
69a53bf2 MS |
2088 | /* |
2089 | * Abort all requests. | |
2090 | * | |
b716d425 MS |
2091 | * Emergency exit in case of a malicious or accidental deadlock, or just a hung |
2092 | * filesystem. | |
2093 | * | |
2094 | * The same effect is usually achievable through killing the filesystem daemon | |
2095 | * and all users of the filesystem. The exception is the combination of an | |
2096 | * asynchronous request and the tricky deadlock (see | |
2097 | * Documentation/filesystems/fuse.txt). | |
69a53bf2 | 2098 | * |
b716d425 MS |
2099 | * Aborting requests under I/O goes as follows: 1: Separate out unlocked |
2100 | * requests, they should be finished off immediately. Locked requests will be | |
2101 | * finished after unlock; see unlock_request(). 2: Finish off the unlocked | |
2102 | * requests. It is possible that some request will finish before we can. This | |
2103 | * is OK, the request will in that case be removed from the list before we touch | |
2104 | * it. | |
69a53bf2 MS |
2105 | */ |
2106 | void fuse_abort_conn(struct fuse_conn *fc) | |
2107 | { | |
d7133114 | 2108 | spin_lock(&fc->lock); |
69a53bf2 | 2109 | if (fc->connected) { |
b716d425 | 2110 | struct fuse_req *req, *next; |
41f98274 MS |
2111 | LIST_HEAD(to_end1); |
2112 | LIST_HEAD(to_end2); | |
b716d425 | 2113 | |
69a53bf2 | 2114 | fc->connected = 0; |
51eb01e7 | 2115 | fc->blocked = 0; |
9759bd51 | 2116 | fuse_set_initialized(fc); |
b716d425 MS |
2117 | list_for_each_entry_safe(req, next, &fc->io, list) { |
2118 | req->out.h.error = -ECONNABORTED; | |
2119 | spin_lock(&req->waitq.lock); | |
2120 | set_bit(FR_ABORTED, &req->flags); | |
2121 | if (!test_bit(FR_LOCKED, &req->flags)) | |
41f98274 | 2122 | list_move(&req->list, &to_end1); |
b716d425 MS |
2123 | spin_unlock(&req->waitq.lock); |
2124 | } | |
41f98274 MS |
2125 | fc->max_background = UINT_MAX; |
2126 | flush_bg_queue(fc); | |
2127 | list_splice_init(&fc->pending, &to_end2); | |
2128 | list_splice_init(&fc->processing, &to_end2); | |
2129 | while (!list_empty(&to_end1)) { | |
2130 | req = list_first_entry(&to_end1, struct fuse_req, list); | |
b716d425 MS |
2131 | __fuse_get_request(req); |
2132 | request_end(fc, req); | |
2133 | spin_lock(&fc->lock); | |
2134 | } | |
41f98274 | 2135 | end_requests(fc, &to_end2); |
b716d425 MS |
2136 | while (forget_pending(fc)) |
2137 | kfree(dequeue_forget(fc, 1, NULL)); | |
357ccf2b | 2138 | end_polls(fc); |
69a53bf2 | 2139 | wake_up_all(&fc->waitq); |
51eb01e7 | 2140 | wake_up_all(&fc->blocked_waitq); |
385a17bf | 2141 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
69a53bf2 | 2142 | } |
d7133114 | 2143 | spin_unlock(&fc->lock); |
69a53bf2 | 2144 | } |
08cbf542 | 2145 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
69a53bf2 | 2146 | |
08cbf542 | 2147 | int fuse_dev_release(struct inode *inode, struct file *file) |
334f485d | 2148 | { |
0720b315 | 2149 | struct fuse_conn *fc = fuse_get_conn(file); |
334f485d | 2150 | if (fc) { |
ccd0a0bd MS |
2151 | WARN_ON(!list_empty(&fc->io)); |
2152 | WARN_ON(fc->fasync != NULL); | |
2153 | fuse_abort_conn(fc); | |
bafa9654 | 2154 | fuse_conn_put(fc); |
385a17bf | 2155 | } |
f543f253 | 2156 | |
334f485d MS |
2157 | return 0; |
2158 | } | |
08cbf542 | 2159 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
334f485d | 2160 | |
385a17bf JD |
2161 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
2162 | { | |
2163 | struct fuse_conn *fc = fuse_get_conn(file); | |
2164 | if (!fc) | |
a87046d8 | 2165 | return -EPERM; |
385a17bf JD |
2166 | |
2167 | /* No locking - fasync_helper does its own locking */ | |
2168 | return fasync_helper(fd, file, on, &fc->fasync); | |
2169 | } | |
2170 | ||
4b6f5d20 | 2171 | const struct file_operations fuse_dev_operations = { |
334f485d | 2172 | .owner = THIS_MODULE, |
94e4fe2c | 2173 | .open = fuse_dev_open, |
334f485d | 2174 | .llseek = no_llseek, |
fbdbacca | 2175 | .read_iter = fuse_dev_read, |
c3021629 | 2176 | .splice_read = fuse_dev_splice_read, |
fbdbacca | 2177 | .write_iter = fuse_dev_write, |
dd3bb14f | 2178 | .splice_write = fuse_dev_splice_write, |
334f485d MS |
2179 | .poll = fuse_dev_poll, |
2180 | .release = fuse_dev_release, | |
385a17bf | 2181 | .fasync = fuse_dev_fasync, |
334f485d | 2182 | }; |
08cbf542 | 2183 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
334f485d MS |
2184 | |
2185 | static struct miscdevice fuse_miscdevice = { | |
2186 | .minor = FUSE_MINOR, | |
2187 | .name = "fuse", | |
2188 | .fops = &fuse_dev_operations, | |
2189 | }; | |
2190 | ||
2191 | int __init fuse_dev_init(void) | |
2192 | { | |
2193 | int err = -ENOMEM; | |
2194 | fuse_req_cachep = kmem_cache_create("fuse_request", | |
2195 | sizeof(struct fuse_req), | |
20c2df83 | 2196 | 0, 0, NULL); |
334f485d MS |
2197 | if (!fuse_req_cachep) |
2198 | goto out; | |
2199 | ||
2200 | err = misc_register(&fuse_miscdevice); | |
2201 | if (err) | |
2202 | goto out_cache_clean; | |
2203 | ||
2204 | return 0; | |
2205 | ||
2206 | out_cache_clean: | |
2207 | kmem_cache_destroy(fuse_req_cachep); | |
2208 | out: | |
2209 | return err; | |
2210 | } | |
2211 | ||
2212 | void fuse_dev_cleanup(void) | |
2213 | { | |
2214 | misc_deregister(&fuse_miscdevice); | |
2215 | kmem_cache_destroy(fuse_req_cachep); | |
2216 | } |