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Commit | Line | Data |
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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> | |
174cd4b1 | 14 | #include <linux/sched/signal.h> |
334f485d MS |
15 | #include <linux/uio.h> |
16 | #include <linux/miscdevice.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/file.h> | |
19 | #include <linux/slab.h> | |
dd3bb14f | 20 | #include <linux/pipe_fs_i.h> |
ce534fb0 MS |
21 | #include <linux/swap.h> |
22 | #include <linux/splice.h> | |
0b6e9ea0 | 23 | #include <linux/sched.h> |
334f485d MS |
24 | |
25 | MODULE_ALIAS_MISCDEV(FUSE_MINOR); | |
578454ff | 26 | MODULE_ALIAS("devname:fuse"); |
334f485d | 27 | |
e18b890b | 28 | static struct kmem_cache *fuse_req_cachep; |
334f485d | 29 | |
cc080e9e | 30 | static struct fuse_dev *fuse_get_dev(struct file *file) |
334f485d | 31 | { |
0720b315 MS |
32 | /* |
33 | * Lockless access is OK, because file->private data is set | |
34 | * once during mount and is valid until the file is released. | |
35 | */ | |
6aa7de05 | 36 | return READ_ONCE(file->private_data); |
334f485d MS |
37 | } |
38 | ||
4250c066 | 39 | static void fuse_request_init(struct fuse_req *req, struct page **pages, |
b2430d75 | 40 | struct fuse_page_desc *page_descs, |
4250c066 | 41 | unsigned npages) |
334f485d MS |
42 | { |
43 | memset(req, 0, sizeof(*req)); | |
4250c066 | 44 | memset(pages, 0, sizeof(*pages) * npages); |
b2430d75 | 45 | memset(page_descs, 0, sizeof(*page_descs) * npages); |
334f485d | 46 | INIT_LIST_HEAD(&req->list); |
a4d27e75 | 47 | INIT_LIST_HEAD(&req->intr_entry); |
334f485d | 48 | init_waitqueue_head(&req->waitq); |
ec99f6d3 | 49 | refcount_set(&req->count, 1); |
4250c066 | 50 | req->pages = pages; |
b2430d75 | 51 | req->page_descs = page_descs; |
4250c066 | 52 | req->max_pages = npages; |
33e14b4d | 53 | __set_bit(FR_PENDING, &req->flags); |
334f485d MS |
54 | } |
55 | ||
4250c066 | 56 | static struct fuse_req *__fuse_request_alloc(unsigned npages, gfp_t flags) |
334f485d | 57 | { |
4250c066 MP |
58 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, flags); |
59 | if (req) { | |
60 | struct page **pages; | |
b2430d75 | 61 | struct fuse_page_desc *page_descs; |
4250c066 | 62 | |
b2430d75 | 63 | if (npages <= FUSE_REQ_INLINE_PAGES) { |
4250c066 | 64 | pages = req->inline_pages; |
b2430d75 MP |
65 | page_descs = req->inline_page_descs; |
66 | } else { | |
4250c066 | 67 | pages = kmalloc(sizeof(struct page *) * npages, flags); |
b2430d75 MP |
68 | page_descs = kmalloc(sizeof(struct fuse_page_desc) * |
69 | npages, flags); | |
70 | } | |
4250c066 | 71 | |
b2430d75 MP |
72 | if (!pages || !page_descs) { |
73 | kfree(pages); | |
74 | kfree(page_descs); | |
4250c066 MP |
75 | kmem_cache_free(fuse_req_cachep, req); |
76 | return NULL; | |
77 | } | |
78 | ||
b2430d75 | 79 | fuse_request_init(req, pages, page_descs, npages); |
4250c066 | 80 | } |
334f485d MS |
81 | return req; |
82 | } | |
4250c066 MP |
83 | |
84 | struct fuse_req *fuse_request_alloc(unsigned npages) | |
85 | { | |
86 | return __fuse_request_alloc(npages, GFP_KERNEL); | |
87 | } | |
08cbf542 | 88 | EXPORT_SYMBOL_GPL(fuse_request_alloc); |
334f485d | 89 | |
4250c066 | 90 | struct fuse_req *fuse_request_alloc_nofs(unsigned npages) |
3be5a52b | 91 | { |
4250c066 | 92 | return __fuse_request_alloc(npages, GFP_NOFS); |
3be5a52b MS |
93 | } |
94 | ||
334f485d MS |
95 | void fuse_request_free(struct fuse_req *req) |
96 | { | |
b2430d75 | 97 | if (req->pages != req->inline_pages) { |
4250c066 | 98 | kfree(req->pages); |
b2430d75 MP |
99 | kfree(req->page_descs); |
100 | } | |
334f485d MS |
101 | kmem_cache_free(fuse_req_cachep, req); |
102 | } | |
103 | ||
36cf66ed | 104 | void __fuse_get_request(struct fuse_req *req) |
334f485d | 105 | { |
ec99f6d3 | 106 | refcount_inc(&req->count); |
334f485d MS |
107 | } |
108 | ||
109 | /* Must be called with > 1 refcount */ | |
110 | static void __fuse_put_request(struct fuse_req *req) | |
111 | { | |
ec99f6d3 | 112 | refcount_dec(&req->count); |
334f485d MS |
113 | } |
114 | ||
0b6e9ea0 | 115 | static void fuse_req_init_context(struct fuse_conn *fc, struct fuse_req *req) |
33649c91 | 116 | { |
b4d18894 SF |
117 | req->in.h.uid = from_kuid(fc->user_ns, current_fsuid()); |
118 | req->in.h.gid = from_kgid(fc->user_ns, current_fsgid()); | |
0b6e9ea0 | 119 | req->in.h.pid = pid_nr_ns(task_pid(current), fc->pid_ns); |
33649c91 MS |
120 | } |
121 | ||
9759bd51 MS |
122 | void fuse_set_initialized(struct fuse_conn *fc) |
123 | { | |
124 | /* Make sure stores before this are seen on another CPU */ | |
125 | smp_wmb(); | |
126 | fc->initialized = 1; | |
127 | } | |
128 | ||
0aada884 MP |
129 | static bool fuse_block_alloc(struct fuse_conn *fc, bool for_background) |
130 | { | |
131 | return !fc->initialized || (for_background && fc->blocked); | |
132 | } | |
133 | ||
d97f27fd MS |
134 | static void fuse_drop_waiting(struct fuse_conn *fc) |
135 | { | |
ff945706 MS |
136 | /* |
137 | * lockess check of fc->connected is okay, because atomic_dec_and_test() | |
138 | * provides a memory barrier mached with the one in fuse_wait_aborted() | |
139 | * to ensure no wake-up is missed. | |
140 | */ | |
141 | if (atomic_dec_and_test(&fc->num_waiting) && | |
142 | !READ_ONCE(fc->connected)) { | |
d97f27fd MS |
143 | /* wake up aborters */ |
144 | wake_up_all(&fc->blocked_waitq); | |
145 | } | |
146 | } | |
147 | ||
8b41e671 MP |
148 | static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages, |
149 | bool for_background) | |
334f485d | 150 | { |
08a53cdc | 151 | struct fuse_req *req; |
08a53cdc | 152 | int err; |
9bc5ddda | 153 | atomic_inc(&fc->num_waiting); |
0aada884 MP |
154 | |
155 | if (fuse_block_alloc(fc, for_background)) { | |
0aada884 | 156 | err = -EINTR; |
7d3a07fc AV |
157 | if (wait_event_killable_exclusive(fc->blocked_waitq, |
158 | !fuse_block_alloc(fc, for_background))) | |
0aada884 MP |
159 | goto out; |
160 | } | |
9759bd51 MS |
161 | /* Matches smp_wmb() in fuse_set_initialized() */ |
162 | smp_rmb(); | |
08a53cdc | 163 | |
51eb01e7 MS |
164 | err = -ENOTCONN; |
165 | if (!fc->connected) | |
166 | goto out; | |
167 | ||
de155226 MS |
168 | err = -ECONNREFUSED; |
169 | if (fc->conn_error) | |
170 | goto out; | |
171 | ||
b111c8c0 | 172 | req = fuse_request_alloc(npages); |
9bc5ddda | 173 | err = -ENOMEM; |
722d2bea MP |
174 | if (!req) { |
175 | if (for_background) | |
176 | wake_up(&fc->blocked_waitq); | |
9bc5ddda | 177 | goto out; |
722d2bea | 178 | } |
334f485d | 179 | |
0b6e9ea0 | 180 | fuse_req_init_context(fc, req); |
825d6d33 MS |
181 | __set_bit(FR_WAITING, &req->flags); |
182 | if (for_background) | |
183 | __set_bit(FR_BACKGROUND, &req->flags); | |
b4d18894 SF |
184 | if (req->in.h.uid == (uid_t)-1 || req->in.h.gid == (gid_t)-1) { |
185 | fuse_put_request(fc, req); | |
186 | return ERR_PTR(-EOVERFLOW); | |
187 | } | |
825d6d33 | 188 | |
334f485d | 189 | return req; |
9bc5ddda MS |
190 | |
191 | out: | |
d97f27fd | 192 | fuse_drop_waiting(fc); |
9bc5ddda | 193 | return ERR_PTR(err); |
334f485d | 194 | } |
8b41e671 MP |
195 | |
196 | struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages) | |
197 | { | |
198 | return __fuse_get_req(fc, npages, false); | |
199 | } | |
08cbf542 | 200 | EXPORT_SYMBOL_GPL(fuse_get_req); |
334f485d | 201 | |
8b41e671 MP |
202 | struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, |
203 | unsigned npages) | |
204 | { | |
205 | return __fuse_get_req(fc, npages, true); | |
206 | } | |
207 | EXPORT_SYMBOL_GPL(fuse_get_req_for_background); | |
208 | ||
33649c91 MS |
209 | /* |
210 | * Return request in fuse_file->reserved_req. However that may | |
211 | * currently be in use. If that is the case, wait for it to become | |
212 | * available. | |
213 | */ | |
214 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, | |
215 | struct file *file) | |
216 | { | |
217 | struct fuse_req *req = NULL; | |
218 | struct fuse_file *ff = file->private_data; | |
219 | ||
220 | do { | |
de5e3dec | 221 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
33649c91 MS |
222 | spin_lock(&fc->lock); |
223 | if (ff->reserved_req) { | |
224 | req = ff->reserved_req; | |
225 | ff->reserved_req = NULL; | |
cb0942b8 | 226 | req->stolen_file = get_file(file); |
33649c91 MS |
227 | } |
228 | spin_unlock(&fc->lock); | |
229 | } while (!req); | |
230 | ||
231 | return req; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Put stolen request back into fuse_file->reserved_req | |
236 | */ | |
237 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) | |
238 | { | |
239 | struct file *file = req->stolen_file; | |
240 | struct fuse_file *ff = file->private_data; | |
241 | ||
242 | spin_lock(&fc->lock); | |
b2430d75 | 243 | fuse_request_init(req, req->pages, req->page_descs, req->max_pages); |
33649c91 MS |
244 | BUG_ON(ff->reserved_req); |
245 | ff->reserved_req = req; | |
de5e3dec | 246 | wake_up_all(&fc->reserved_req_waitq); |
33649c91 MS |
247 | spin_unlock(&fc->lock); |
248 | fput(file); | |
249 | } | |
250 | ||
251 | /* | |
252 | * Gets a requests for a file operation, always succeeds | |
253 | * | |
254 | * This is used for sending the FLUSH request, which must get to | |
255 | * userspace, due to POSIX locks which may need to be unlocked. | |
256 | * | |
257 | * If allocation fails due to OOM, use the reserved request in | |
258 | * fuse_file. | |
259 | * | |
260 | * This is very unlikely to deadlock accidentally, since the | |
261 | * filesystem should not have it's own file open. If deadlock is | |
262 | * intentional, it can still be broken by "aborting" the filesystem. | |
263 | */ | |
b111c8c0 MP |
264 | struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, |
265 | struct file *file) | |
33649c91 MS |
266 | { |
267 | struct fuse_req *req; | |
268 | ||
269 | atomic_inc(&fc->num_waiting); | |
0aada884 | 270 | wait_event(fc->blocked_waitq, fc->initialized); |
9759bd51 MS |
271 | /* Matches smp_wmb() in fuse_set_initialized() */ |
272 | smp_rmb(); | |
b111c8c0 | 273 | req = fuse_request_alloc(0); |
33649c91 MS |
274 | if (!req) |
275 | req = get_reserved_req(fc, file); | |
276 | ||
0b6e9ea0 | 277 | fuse_req_init_context(fc, req); |
825d6d33 MS |
278 | __set_bit(FR_WAITING, &req->flags); |
279 | __clear_bit(FR_BACKGROUND, &req->flags); | |
33649c91 MS |
280 | return req; |
281 | } | |
282 | ||
334f485d | 283 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
7128ec2a | 284 | { |
ec99f6d3 | 285 | if (refcount_dec_and_test(&req->count)) { |
825d6d33 | 286 | if (test_bit(FR_BACKGROUND, &req->flags)) { |
722d2bea MP |
287 | /* |
288 | * We get here in the unlikely case that a background | |
289 | * request was allocated but not sent | |
290 | */ | |
291 | spin_lock(&fc->lock); | |
292 | if (!fc->blocked) | |
293 | wake_up(&fc->blocked_waitq); | |
294 | spin_unlock(&fc->lock); | |
295 | } | |
296 | ||
825d6d33 MS |
297 | if (test_bit(FR_WAITING, &req->flags)) { |
298 | __clear_bit(FR_WAITING, &req->flags); | |
d97f27fd | 299 | fuse_drop_waiting(fc); |
73e0e738 | 300 | } |
33649c91 MS |
301 | |
302 | if (req->stolen_file) | |
303 | put_reserved_req(fc, req); | |
304 | else | |
305 | fuse_request_free(req); | |
7128ec2a MS |
306 | } |
307 | } | |
08cbf542 | 308 | EXPORT_SYMBOL_GPL(fuse_put_request); |
7128ec2a | 309 | |
d12def1b MS |
310 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
311 | { | |
312 | unsigned nbytes = 0; | |
313 | unsigned i; | |
314 | ||
315 | for (i = 0; i < numargs; i++) | |
316 | nbytes += args[i].size; | |
317 | ||
318 | return nbytes; | |
319 | } | |
320 | ||
f88996a9 | 321 | static u64 fuse_get_unique(struct fuse_iqueue *fiq) |
d12def1b | 322 | { |
f88996a9 | 323 | return ++fiq->reqctr; |
d12def1b MS |
324 | } |
325 | ||
f88996a9 | 326 | static void queue_request(struct fuse_iqueue *fiq, struct fuse_req *req) |
d12def1b | 327 | { |
d12def1b MS |
328 | req->in.h.len = sizeof(struct fuse_in_header) + |
329 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); | |
f88996a9 | 330 | list_add_tail(&req->list, &fiq->pending); |
4ce60812 | 331 | wake_up_locked(&fiq->waitq); |
f88996a9 | 332 | kill_fasync(&fiq->fasync, SIGIO, POLL_IN); |
d12def1b MS |
333 | } |
334 | ||
07e77dca MS |
335 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
336 | u64 nodeid, u64 nlookup) | |
337 | { | |
f88996a9 MS |
338 | struct fuse_iqueue *fiq = &fc->iq; |
339 | ||
02c048b9 MS |
340 | forget->forget_one.nodeid = nodeid; |
341 | forget->forget_one.nlookup = nlookup; | |
07e77dca | 342 | |
4ce60812 | 343 | spin_lock(&fiq->waitq.lock); |
e16714d8 | 344 | if (fiq->connected) { |
f88996a9 MS |
345 | fiq->forget_list_tail->next = forget; |
346 | fiq->forget_list_tail = forget; | |
4ce60812 | 347 | wake_up_locked(&fiq->waitq); |
f88996a9 | 348 | kill_fasync(&fiq->fasync, SIGIO, POLL_IN); |
5dfcc87f MS |
349 | } else { |
350 | kfree(forget); | |
351 | } | |
4ce60812 | 352 | spin_unlock(&fiq->waitq.lock); |
07e77dca MS |
353 | } |
354 | ||
d12def1b MS |
355 | static void flush_bg_queue(struct fuse_conn *fc) |
356 | { | |
7a6d3c8b | 357 | while (fc->active_background < fc->max_background && |
d12def1b MS |
358 | !list_empty(&fc->bg_queue)) { |
359 | struct fuse_req *req; | |
f88996a9 | 360 | struct fuse_iqueue *fiq = &fc->iq; |
d12def1b MS |
361 | |
362 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); | |
363 | list_del(&req->list); | |
364 | fc->active_background++; | |
4ce60812 | 365 | spin_lock(&fiq->waitq.lock); |
f88996a9 MS |
366 | req->in.h.unique = fuse_get_unique(fiq); |
367 | queue_request(fiq, req); | |
4ce60812 | 368 | spin_unlock(&fiq->waitq.lock); |
d12def1b MS |
369 | } |
370 | } | |
371 | ||
334f485d MS |
372 | /* |
373 | * This function is called when a request is finished. Either a reply | |
f9a2842e | 374 | * has arrived or it was aborted (and not yet sent) or some error |
f43b155a | 375 | * occurred during communication with userspace, or the device file |
51eb01e7 MS |
376 | * was closed. The requester thread is woken up (if still waiting), |
377 | * the 'end' callback is called if given, else the reference to the | |
378 | * request is released | |
334f485d MS |
379 | */ |
380 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) | |
381 | { | |
4ce60812 | 382 | struct fuse_iqueue *fiq = &fc->iq; |
365ae710 | 383 | |
efe2800f | 384 | if (test_and_set_bit(FR_FINISHED, &req->flags)) |
d97f27fd | 385 | goto put_request; |
365ae710 | 386 | |
4ce60812 | 387 | spin_lock(&fiq->waitq.lock); |
0d8e84b0 | 388 | list_del_init(&req->intr_entry); |
4ce60812 | 389 | spin_unlock(&fiq->waitq.lock); |
33e14b4d MS |
390 | WARN_ON(test_bit(FR_PENDING, &req->flags)); |
391 | WARN_ON(test_bit(FR_SENT, &req->flags)); | |
825d6d33 | 392 | if (test_bit(FR_BACKGROUND, &req->flags)) { |
efe2800f | 393 | spin_lock(&fc->lock); |
825d6d33 | 394 | clear_bit(FR_BACKGROUND, &req->flags); |
28ec6315 | 395 | if (fc->num_background == fc->max_background) { |
51eb01e7 | 396 | fc->blocked = 0; |
722d2bea | 397 | wake_up(&fc->blocked_waitq); |
28ec6315 MS |
398 | } else if (!fc->blocked) { |
399 | /* | |
400 | * Wake up next waiter, if any. It's okay to use | |
401 | * waitqueue_active(), as we've already synced up | |
402 | * fc->blocked with waiters with the wake_up() call | |
403 | * above. | |
404 | */ | |
405 | if (waitqueue_active(&fc->blocked_waitq)) | |
406 | wake_up(&fc->blocked_waitq); | |
407 | } | |
722d2bea | 408 | |
c0e31b21 | 409 | if (fc->num_background == fc->congestion_threshold && fc->sb) { |
5f7f7543 JK |
410 | clear_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC); |
411 | clear_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC); | |
f92b99b9 | 412 | } |
51eb01e7 | 413 | fc->num_background--; |
d12def1b MS |
414 | fc->active_background--; |
415 | flush_bg_queue(fc); | |
efe2800f | 416 | spin_unlock(&fc->lock); |
334f485d | 417 | } |
51eb01e7 | 418 | wake_up(&req->waitq); |
1e6881c3 MS |
419 | if (req->end) |
420 | req->end(fc, req); | |
d97f27fd | 421 | put_request: |
e9bb09dd | 422 | fuse_put_request(fc, req); |
334f485d MS |
423 | } |
424 | ||
f88996a9 | 425 | static void queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req) |
a4d27e75 | 426 | { |
4ce60812 | 427 | spin_lock(&fiq->waitq.lock); |
6ba4d272 ST |
428 | if (test_bit(FR_FINISHED, &req->flags)) { |
429 | spin_unlock(&fiq->waitq.lock); | |
430 | return; | |
431 | } | |
8f7bb368 MS |
432 | if (list_empty(&req->intr_entry)) { |
433 | list_add_tail(&req->intr_entry, &fiq->interrupts); | |
434 | wake_up_locked(&fiq->waitq); | |
435 | } | |
4ce60812 | 436 | spin_unlock(&fiq->waitq.lock); |
f88996a9 | 437 | kill_fasync(&fiq->fasync, SIGIO, POLL_IN); |
a4d27e75 MS |
438 | } |
439 | ||
7c352bdf | 440 | static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 441 | { |
4ce60812 | 442 | struct fuse_iqueue *fiq = &fc->iq; |
c4775267 MS |
443 | int err; |
444 | ||
a4d27e75 MS |
445 | if (!fc->no_interrupt) { |
446 | /* Any signal may interrupt this */ | |
c4775267 | 447 | err = wait_event_interruptible(req->waitq, |
33e14b4d | 448 | test_bit(FR_FINISHED, &req->flags)); |
c4775267 | 449 | if (!err) |
a4d27e75 MS |
450 | return; |
451 | ||
825d6d33 | 452 | set_bit(FR_INTERRUPTED, &req->flags); |
8f7bb368 MS |
453 | /* matches barrier in fuse_dev_do_read() */ |
454 | smp_mb__after_atomic(); | |
33e14b4d | 455 | if (test_bit(FR_SENT, &req->flags)) |
4ce60812 | 456 | queue_interrupt(fiq, req); |
a4d27e75 MS |
457 | } |
458 | ||
825d6d33 | 459 | if (!test_bit(FR_FORCE, &req->flags)) { |
a4d27e75 | 460 | /* Only fatal signals may interrupt this */ |
7d3a07fc | 461 | err = wait_event_killable(req->waitq, |
33e14b4d | 462 | test_bit(FR_FINISHED, &req->flags)); |
c4775267 | 463 | if (!err) |
a131de0a MS |
464 | return; |
465 | ||
4ce60812 | 466 | spin_lock(&fiq->waitq.lock); |
a131de0a | 467 | /* Request is not yet in userspace, bail out */ |
33e14b4d | 468 | if (test_bit(FR_PENDING, &req->flags)) { |
a131de0a | 469 | list_del(&req->list); |
4ce60812 | 470 | spin_unlock(&fiq->waitq.lock); |
a131de0a MS |
471 | __fuse_put_request(req); |
472 | req->out.h.error = -EINTR; | |
473 | return; | |
474 | } | |
4ce60812 | 475 | spin_unlock(&fiq->waitq.lock); |
51eb01e7 | 476 | } |
334f485d | 477 | |
a131de0a MS |
478 | /* |
479 | * Either request is already in userspace, or it was forced. | |
480 | * Wait it out. | |
481 | */ | |
33e14b4d | 482 | wait_event(req->waitq, test_bit(FR_FINISHED, &req->flags)); |
334f485d MS |
483 | } |
484 | ||
6a4e922c | 485 | static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 486 | { |
e16714d8 MS |
487 | struct fuse_iqueue *fiq = &fc->iq; |
488 | ||
825d6d33 | 489 | BUG_ON(test_bit(FR_BACKGROUND, &req->flags)); |
4ce60812 | 490 | spin_lock(&fiq->waitq.lock); |
e16714d8 | 491 | if (!fiq->connected) { |
4ce60812 | 492 | spin_unlock(&fiq->waitq.lock); |
334f485d | 493 | req->out.h.error = -ENOTCONN; |
c4775267 | 494 | } else { |
f88996a9 MS |
495 | req->in.h.unique = fuse_get_unique(fiq); |
496 | queue_request(fiq, req); | |
334f485d MS |
497 | /* acquire extra reference, since request is still needed |
498 | after request_end() */ | |
499 | __fuse_get_request(req); | |
4ce60812 | 500 | spin_unlock(&fiq->waitq.lock); |
334f485d | 501 | |
7c352bdf | 502 | request_wait_answer(fc, req); |
c4775267 MS |
503 | /* Pairs with smp_wmb() in request_end() */ |
504 | smp_rmb(); | |
334f485d | 505 | } |
334f485d | 506 | } |
6a4e922c EW |
507 | |
508 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) | |
509 | { | |
825d6d33 MS |
510 | __set_bit(FR_ISREPLY, &req->flags); |
511 | if (!test_bit(FR_WAITING, &req->flags)) { | |
512 | __set_bit(FR_WAITING, &req->flags); | |
5437f241 MS |
513 | atomic_inc(&fc->num_waiting); |
514 | } | |
6a4e922c EW |
515 | __fuse_request_send(fc, req); |
516 | } | |
08cbf542 | 517 | EXPORT_SYMBOL_GPL(fuse_request_send); |
334f485d | 518 | |
21f62174 MS |
519 | static void fuse_adjust_compat(struct fuse_conn *fc, struct fuse_args *args) |
520 | { | |
521 | if (fc->minor < 4 && args->in.h.opcode == FUSE_STATFS) | |
522 | args->out.args[0].size = FUSE_COMPAT_STATFS_SIZE; | |
523 | ||
524 | if (fc->minor < 9) { | |
525 | switch (args->in.h.opcode) { | |
526 | case FUSE_LOOKUP: | |
527 | case FUSE_CREATE: | |
528 | case FUSE_MKNOD: | |
529 | case FUSE_MKDIR: | |
530 | case FUSE_SYMLINK: | |
531 | case FUSE_LINK: | |
532 | args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
533 | break; | |
534 | case FUSE_GETATTR: | |
535 | case FUSE_SETATTR: | |
536 | args->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
537 | break; | |
538 | } | |
539 | } | |
540 | if (fc->minor < 12) { | |
541 | switch (args->in.h.opcode) { | |
542 | case FUSE_CREATE: | |
543 | args->in.args[0].size = sizeof(struct fuse_open_in); | |
544 | break; | |
545 | case FUSE_MKNOD: | |
546 | args->in.args[0].size = FUSE_COMPAT_MKNOD_IN_SIZE; | |
547 | break; | |
548 | } | |
549 | } | |
550 | } | |
551 | ||
7078187a MS |
552 | ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args) |
553 | { | |
554 | struct fuse_req *req; | |
555 | ssize_t ret; | |
556 | ||
557 | req = fuse_get_req(fc, 0); | |
558 | if (IS_ERR(req)) | |
559 | return PTR_ERR(req); | |
560 | ||
21f62174 MS |
561 | /* Needs to be done after fuse_get_req() so that fc->minor is valid */ |
562 | fuse_adjust_compat(fc, args); | |
563 | ||
7078187a MS |
564 | req->in.h.opcode = args->in.h.opcode; |
565 | req->in.h.nodeid = args->in.h.nodeid; | |
566 | req->in.numargs = args->in.numargs; | |
567 | memcpy(req->in.args, args->in.args, | |
568 | args->in.numargs * sizeof(struct fuse_in_arg)); | |
569 | req->out.argvar = args->out.argvar; | |
570 | req->out.numargs = args->out.numargs; | |
571 | memcpy(req->out.args, args->out.args, | |
572 | args->out.numargs * sizeof(struct fuse_arg)); | |
573 | fuse_request_send(fc, req); | |
574 | ret = req->out.h.error; | |
575 | if (!ret && args->out.argvar) { | |
576 | BUG_ON(args->out.numargs != 1); | |
577 | ret = req->out.args[0].size; | |
578 | } | |
579 | fuse_put_request(fc, req); | |
580 | ||
581 | return ret; | |
582 | } | |
583 | ||
f0139aa8 MS |
584 | /* |
585 | * Called under fc->lock | |
586 | * | |
587 | * fc->connected must have been checked previously | |
588 | */ | |
589 | void fuse_request_send_background_locked(struct fuse_conn *fc, | |
590 | struct fuse_req *req) | |
d12def1b | 591 | { |
825d6d33 MS |
592 | BUG_ON(!test_bit(FR_BACKGROUND, &req->flags)); |
593 | if (!test_bit(FR_WAITING, &req->flags)) { | |
594 | __set_bit(FR_WAITING, &req->flags); | |
5437f241 MS |
595 | atomic_inc(&fc->num_waiting); |
596 | } | |
825d6d33 | 597 | __set_bit(FR_ISREPLY, &req->flags); |
d12def1b | 598 | fc->num_background++; |
7a6d3c8b | 599 | if (fc->num_background == fc->max_background) |
d12def1b | 600 | fc->blocked = 1; |
7fbbe972 | 601 | if (fc->num_background == fc->congestion_threshold && fc->sb) { |
5f7f7543 JK |
602 | set_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC); |
603 | set_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC); | |
d12def1b MS |
604 | } |
605 | list_add_tail(&req->list, &fc->bg_queue); | |
606 | flush_bg_queue(fc); | |
607 | } | |
608 | ||
f0139aa8 | 609 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) |
334f485d | 610 | { |
42dc6211 | 611 | BUG_ON(!req->end); |
d7133114 | 612 | spin_lock(&fc->lock); |
1e9a4ed9 | 613 | if (fc->connected) { |
f0139aa8 | 614 | fuse_request_send_background_locked(fc, req); |
d7133114 | 615 | spin_unlock(&fc->lock); |
334f485d | 616 | } else { |
42dc6211 | 617 | spin_unlock(&fc->lock); |
334f485d | 618 | req->out.h.error = -ENOTCONN; |
42dc6211 MS |
619 | req->end(fc, req); |
620 | fuse_put_request(fc, req); | |
334f485d MS |
621 | } |
622 | } | |
08cbf542 | 623 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
334f485d | 624 | |
2d45ba38 MS |
625 | static int fuse_request_send_notify_reply(struct fuse_conn *fc, |
626 | struct fuse_req *req, u64 unique) | |
627 | { | |
628 | int err = -ENODEV; | |
f88996a9 | 629 | struct fuse_iqueue *fiq = &fc->iq; |
2d45ba38 | 630 | |
825d6d33 | 631 | __clear_bit(FR_ISREPLY, &req->flags); |
2d45ba38 | 632 | req->in.h.unique = unique; |
4ce60812 | 633 | spin_lock(&fiq->waitq.lock); |
e16714d8 | 634 | if (fiq->connected) { |
f88996a9 | 635 | queue_request(fiq, req); |
2d45ba38 MS |
636 | err = 0; |
637 | } | |
4ce60812 | 638 | spin_unlock(&fiq->waitq.lock); |
2d45ba38 MS |
639 | |
640 | return err; | |
641 | } | |
642 | ||
0b05b183 AA |
643 | void fuse_force_forget(struct file *file, u64 nodeid) |
644 | { | |
6131ffaa | 645 | struct inode *inode = file_inode(file); |
0b05b183 AA |
646 | struct fuse_conn *fc = get_fuse_conn(inode); |
647 | struct fuse_req *req; | |
648 | struct fuse_forget_in inarg; | |
649 | ||
650 | memset(&inarg, 0, sizeof(inarg)); | |
651 | inarg.nlookup = 1; | |
b111c8c0 | 652 | req = fuse_get_req_nofail_nopages(fc, file); |
0b05b183 AA |
653 | req->in.h.opcode = FUSE_FORGET; |
654 | req->in.h.nodeid = nodeid; | |
655 | req->in.numargs = 1; | |
656 | req->in.args[0].size = sizeof(inarg); | |
657 | req->in.args[0].value = &inarg; | |
825d6d33 | 658 | __clear_bit(FR_ISREPLY, &req->flags); |
6a4e922c EW |
659 | __fuse_request_send(fc, req); |
660 | /* ignore errors */ | |
661 | fuse_put_request(fc, req); | |
0b05b183 AA |
662 | } |
663 | ||
334f485d MS |
664 | /* |
665 | * Lock the request. Up to the next unlock_request() there mustn't be | |
666 | * anything that could cause a page-fault. If the request was already | |
f9a2842e | 667 | * aborted bail out. |
334f485d | 668 | */ |
dc00809a | 669 | static int lock_request(struct fuse_req *req) |
334f485d MS |
670 | { |
671 | int err = 0; | |
672 | if (req) { | |
dc00809a | 673 | spin_lock(&req->waitq.lock); |
825d6d33 | 674 | if (test_bit(FR_ABORTED, &req->flags)) |
334f485d MS |
675 | err = -ENOENT; |
676 | else | |
825d6d33 | 677 | set_bit(FR_LOCKED, &req->flags); |
dc00809a | 678 | spin_unlock(&req->waitq.lock); |
334f485d MS |
679 | } |
680 | return err; | |
681 | } | |
682 | ||
683 | /* | |
0d8e84b0 MS |
684 | * Unlock request. If it was aborted while locked, caller is responsible |
685 | * for unlocking and ending the request. | |
334f485d | 686 | */ |
dc00809a | 687 | static int unlock_request(struct fuse_req *req) |
334f485d | 688 | { |
0d8e84b0 | 689 | int err = 0; |
334f485d | 690 | if (req) { |
dc00809a | 691 | spin_lock(&req->waitq.lock); |
825d6d33 | 692 | if (test_bit(FR_ABORTED, &req->flags)) |
0d8e84b0 MS |
693 | err = -ENOENT; |
694 | else | |
825d6d33 | 695 | clear_bit(FR_LOCKED, &req->flags); |
dc00809a | 696 | spin_unlock(&req->waitq.lock); |
334f485d | 697 | } |
0d8e84b0 | 698 | return err; |
334f485d MS |
699 | } |
700 | ||
701 | struct fuse_copy_state { | |
702 | int write; | |
703 | struct fuse_req *req; | |
6c09e94a | 704 | struct iov_iter *iter; |
dd3bb14f MS |
705 | struct pipe_buffer *pipebufs; |
706 | struct pipe_buffer *currbuf; | |
707 | struct pipe_inode_info *pipe; | |
334f485d | 708 | unsigned long nr_segs; |
334f485d | 709 | struct page *pg; |
334f485d | 710 | unsigned len; |
c55a01d3 | 711 | unsigned offset; |
ce534fb0 | 712 | unsigned move_pages:1; |
334f485d MS |
713 | }; |
714 | ||
dc00809a | 715 | static void fuse_copy_init(struct fuse_copy_state *cs, int write, |
6c09e94a | 716 | struct iov_iter *iter) |
334f485d MS |
717 | { |
718 | memset(cs, 0, sizeof(*cs)); | |
719 | cs->write = write; | |
6c09e94a | 720 | cs->iter = iter; |
334f485d MS |
721 | } |
722 | ||
723 | /* Unmap and put previous page of userspace buffer */ | |
8bfc016d | 724 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
334f485d | 725 | { |
dd3bb14f MS |
726 | if (cs->currbuf) { |
727 | struct pipe_buffer *buf = cs->currbuf; | |
728 | ||
c55a01d3 | 729 | if (cs->write) |
c3021629 | 730 | buf->len = PAGE_SIZE - cs->len; |
dd3bb14f | 731 | cs->currbuf = NULL; |
c55a01d3 | 732 | } else if (cs->pg) { |
334f485d MS |
733 | if (cs->write) { |
734 | flush_dcache_page(cs->pg); | |
735 | set_page_dirty_lock(cs->pg); | |
736 | } | |
737 | put_page(cs->pg); | |
334f485d | 738 | } |
c55a01d3 | 739 | cs->pg = NULL; |
334f485d MS |
740 | } |
741 | ||
742 | /* | |
743 | * Get another pagefull of userspace buffer, and map it to kernel | |
744 | * address space, and lock request | |
745 | */ | |
746 | static int fuse_copy_fill(struct fuse_copy_state *cs) | |
747 | { | |
c55a01d3 | 748 | struct page *page; |
334f485d MS |
749 | int err; |
750 | ||
dc00809a | 751 | err = unlock_request(cs->req); |
0d8e84b0 MS |
752 | if (err) |
753 | return err; | |
754 | ||
334f485d | 755 | fuse_copy_finish(cs); |
dd3bb14f MS |
756 | if (cs->pipebufs) { |
757 | struct pipe_buffer *buf = cs->pipebufs; | |
758 | ||
c3021629 | 759 | if (!cs->write) { |
fba597db | 760 | err = pipe_buf_confirm(cs->pipe, buf); |
c3021629 MS |
761 | if (err) |
762 | return err; | |
763 | ||
764 | BUG_ON(!cs->nr_segs); | |
765 | cs->currbuf = buf; | |
c55a01d3 MS |
766 | cs->pg = buf->page; |
767 | cs->offset = buf->offset; | |
c3021629 | 768 | cs->len = buf->len; |
c3021629 MS |
769 | cs->pipebufs++; |
770 | cs->nr_segs--; | |
771 | } else { | |
c3021629 MS |
772 | if (cs->nr_segs == cs->pipe->buffers) |
773 | return -EIO; | |
774 | ||
775 | page = alloc_page(GFP_HIGHUSER); | |
776 | if (!page) | |
777 | return -ENOMEM; | |
778 | ||
779 | buf->page = page; | |
780 | buf->offset = 0; | |
781 | buf->len = 0; | |
782 | ||
783 | cs->currbuf = buf; | |
c55a01d3 MS |
784 | cs->pg = page; |
785 | cs->offset = 0; | |
c3021629 MS |
786 | cs->len = PAGE_SIZE; |
787 | cs->pipebufs++; | |
788 | cs->nr_segs++; | |
789 | } | |
dd3bb14f | 790 | } else { |
6c09e94a AV |
791 | size_t off; |
792 | err = iov_iter_get_pages(cs->iter, &page, PAGE_SIZE, 1, &off); | |
dd3bb14f MS |
793 | if (err < 0) |
794 | return err; | |
6c09e94a AV |
795 | BUG_ON(!err); |
796 | cs->len = err; | |
797 | cs->offset = off; | |
c55a01d3 | 798 | cs->pg = page; |
6c09e94a | 799 | iov_iter_advance(cs->iter, err); |
334f485d | 800 | } |
334f485d | 801 | |
dc00809a | 802 | return lock_request(cs->req); |
334f485d MS |
803 | } |
804 | ||
805 | /* Do as much copy to/from userspace buffer as we can */ | |
8bfc016d | 806 | static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size) |
334f485d MS |
807 | { |
808 | unsigned ncpy = min(*size, cs->len); | |
809 | if (val) { | |
c55a01d3 MS |
810 | void *pgaddr = kmap_atomic(cs->pg); |
811 | void *buf = pgaddr + cs->offset; | |
812 | ||
334f485d | 813 | if (cs->write) |
c55a01d3 | 814 | memcpy(buf, *val, ncpy); |
334f485d | 815 | else |
c55a01d3 MS |
816 | memcpy(*val, buf, ncpy); |
817 | ||
818 | kunmap_atomic(pgaddr); | |
334f485d MS |
819 | *val += ncpy; |
820 | } | |
821 | *size -= ncpy; | |
822 | cs->len -= ncpy; | |
c55a01d3 | 823 | cs->offset += ncpy; |
334f485d MS |
824 | return ncpy; |
825 | } | |
826 | ||
ce534fb0 MS |
827 | static int fuse_check_page(struct page *page) |
828 | { | |
829 | if (page_mapcount(page) || | |
830 | page->mapping != NULL || | |
831 | page_count(page) != 1 || | |
832 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & | |
833 | ~(1 << PG_locked | | |
834 | 1 << PG_referenced | | |
835 | 1 << PG_uptodate | | |
836 | 1 << PG_lru | | |
837 | 1 << PG_active | | |
838 | 1 << PG_reclaim))) { | |
839 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); | |
840 | 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); | |
841 | return 1; | |
842 | } | |
843 | return 0; | |
844 | } | |
845 | ||
846 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) | |
847 | { | |
848 | int err; | |
849 | struct page *oldpage = *pagep; | |
850 | struct page *newpage; | |
851 | struct pipe_buffer *buf = cs->pipebufs; | |
ce534fb0 | 852 | |
dc00809a | 853 | err = unlock_request(cs->req); |
0d8e84b0 MS |
854 | if (err) |
855 | return err; | |
856 | ||
ce534fb0 MS |
857 | fuse_copy_finish(cs); |
858 | ||
fba597db | 859 | err = pipe_buf_confirm(cs->pipe, buf); |
ce534fb0 MS |
860 | if (err) |
861 | return err; | |
862 | ||
863 | BUG_ON(!cs->nr_segs); | |
864 | cs->currbuf = buf; | |
865 | cs->len = buf->len; | |
866 | cs->pipebufs++; | |
867 | cs->nr_segs--; | |
868 | ||
869 | if (cs->len != PAGE_SIZE) | |
870 | goto out_fallback; | |
871 | ||
ca76f5b6 | 872 | if (pipe_buf_steal(cs->pipe, buf) != 0) |
ce534fb0 MS |
873 | goto out_fallback; |
874 | ||
875 | newpage = buf->page; | |
876 | ||
aa991b3b MS |
877 | if (!PageUptodate(newpage)) |
878 | SetPageUptodate(newpage); | |
ce534fb0 MS |
879 | |
880 | ClearPageMappedToDisk(newpage); | |
881 | ||
882 | if (fuse_check_page(newpage) != 0) | |
883 | goto out_fallback_unlock; | |
884 | ||
ce534fb0 MS |
885 | /* |
886 | * This is a new and locked page, it shouldn't be mapped or | |
887 | * have any special flags on it | |
888 | */ | |
889 | if (WARN_ON(page_mapped(oldpage))) | |
890 | goto out_fallback_unlock; | |
891 | if (WARN_ON(page_has_private(oldpage))) | |
892 | goto out_fallback_unlock; | |
893 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) | |
894 | goto out_fallback_unlock; | |
895 | if (WARN_ON(PageMlocked(oldpage))) | |
896 | goto out_fallback_unlock; | |
897 | ||
ef6a3c63 | 898 | err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL); |
ce534fb0 | 899 | if (err) { |
ef6a3c63 MS |
900 | unlock_page(newpage); |
901 | return err; | |
ce534fb0 | 902 | } |
ef6a3c63 | 903 | |
09cbfeaf | 904 | get_page(newpage); |
ce534fb0 MS |
905 | |
906 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) | |
907 | lru_cache_add_file(newpage); | |
908 | ||
909 | err = 0; | |
dc00809a | 910 | spin_lock(&cs->req->waitq.lock); |
825d6d33 | 911 | if (test_bit(FR_ABORTED, &cs->req->flags)) |
ce534fb0 MS |
912 | err = -ENOENT; |
913 | else | |
914 | *pagep = newpage; | |
dc00809a | 915 | spin_unlock(&cs->req->waitq.lock); |
ce534fb0 MS |
916 | |
917 | if (err) { | |
918 | unlock_page(newpage); | |
09cbfeaf | 919 | put_page(newpage); |
ce534fb0 MS |
920 | return err; |
921 | } | |
922 | ||
923 | unlock_page(oldpage); | |
09cbfeaf | 924 | put_page(oldpage); |
ce534fb0 MS |
925 | cs->len = 0; |
926 | ||
927 | return 0; | |
928 | ||
929 | out_fallback_unlock: | |
930 | unlock_page(newpage); | |
931 | out_fallback: | |
c55a01d3 MS |
932 | cs->pg = buf->page; |
933 | cs->offset = buf->offset; | |
ce534fb0 | 934 | |
dc00809a | 935 | err = lock_request(cs->req); |
ce534fb0 MS |
936 | if (err) |
937 | return err; | |
938 | ||
939 | return 1; | |
940 | } | |
941 | ||
c3021629 MS |
942 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
943 | unsigned offset, unsigned count) | |
944 | { | |
945 | struct pipe_buffer *buf; | |
0d8e84b0 | 946 | int err; |
c3021629 MS |
947 | |
948 | if (cs->nr_segs == cs->pipe->buffers) | |
949 | return -EIO; | |
950 | ||
dc00809a | 951 | err = unlock_request(cs->req); |
0d8e84b0 MS |
952 | if (err) |
953 | return err; | |
954 | ||
c3021629 MS |
955 | fuse_copy_finish(cs); |
956 | ||
957 | buf = cs->pipebufs; | |
09cbfeaf | 958 | get_page(page); |
c3021629 MS |
959 | buf->page = page; |
960 | buf->offset = offset; | |
961 | buf->len = count; | |
962 | ||
963 | cs->pipebufs++; | |
964 | cs->nr_segs++; | |
965 | cs->len = 0; | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
334f485d MS |
970 | /* |
971 | * Copy a page in the request to/from the userspace buffer. Must be | |
972 | * done atomically | |
973 | */ | |
ce534fb0 | 974 | static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep, |
8bfc016d | 975 | unsigned offset, unsigned count, int zeroing) |
334f485d | 976 | { |
ce534fb0 MS |
977 | int err; |
978 | struct page *page = *pagep; | |
979 | ||
b6777c40 MS |
980 | if (page && zeroing && count < PAGE_SIZE) |
981 | clear_highpage(page); | |
982 | ||
334f485d | 983 | while (count) { |
c3021629 MS |
984 | if (cs->write && cs->pipebufs && page) { |
985 | return fuse_ref_page(cs, page, offset, count); | |
986 | } else if (!cs->len) { | |
ce534fb0 MS |
987 | if (cs->move_pages && page && |
988 | offset == 0 && count == PAGE_SIZE) { | |
989 | err = fuse_try_move_page(cs, pagep); | |
990 | if (err <= 0) | |
991 | return err; | |
992 | } else { | |
993 | err = fuse_copy_fill(cs); | |
994 | if (err) | |
995 | return err; | |
996 | } | |
1729a16c | 997 | } |
334f485d | 998 | if (page) { |
2408f6ef | 999 | void *mapaddr = kmap_atomic(page); |
334f485d MS |
1000 | void *buf = mapaddr + offset; |
1001 | offset += fuse_copy_do(cs, &buf, &count); | |
2408f6ef | 1002 | kunmap_atomic(mapaddr); |
334f485d MS |
1003 | } else |
1004 | offset += fuse_copy_do(cs, NULL, &count); | |
1005 | } | |
1006 | if (page && !cs->write) | |
1007 | flush_dcache_page(page); | |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | /* Copy pages in the request to/from userspace buffer */ | |
1012 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, | |
1013 | int zeroing) | |
1014 | { | |
1015 | unsigned i; | |
1016 | struct fuse_req *req = cs->req; | |
334f485d MS |
1017 | |
1018 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { | |
ce534fb0 | 1019 | int err; |
85f40aec MP |
1020 | unsigned offset = req->page_descs[i].offset; |
1021 | unsigned count = min(nbytes, req->page_descs[i].length); | |
ce534fb0 MS |
1022 | |
1023 | err = fuse_copy_page(cs, &req->pages[i], offset, count, | |
1024 | zeroing); | |
334f485d MS |
1025 | if (err) |
1026 | return err; | |
1027 | ||
1028 | nbytes -= count; | |
334f485d MS |
1029 | } |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | /* Copy a single argument in the request to/from userspace buffer */ | |
1034 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) | |
1035 | { | |
1036 | while (size) { | |
1729a16c MS |
1037 | if (!cs->len) { |
1038 | int err = fuse_copy_fill(cs); | |
1039 | if (err) | |
1040 | return err; | |
1041 | } | |
334f485d MS |
1042 | fuse_copy_do(cs, &val, &size); |
1043 | } | |
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | /* Copy request arguments to/from userspace buffer */ | |
1048 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, | |
1049 | unsigned argpages, struct fuse_arg *args, | |
1050 | int zeroing) | |
1051 | { | |
1052 | int err = 0; | |
1053 | unsigned i; | |
1054 | ||
1055 | for (i = 0; !err && i < numargs; i++) { | |
1056 | struct fuse_arg *arg = &args[i]; | |
1057 | if (i == numargs - 1 && argpages) | |
1058 | err = fuse_copy_pages(cs, arg->size, zeroing); | |
1059 | else | |
1060 | err = fuse_copy_one(cs, arg->value, arg->size); | |
1061 | } | |
1062 | return err; | |
1063 | } | |
1064 | ||
f88996a9 | 1065 | static int forget_pending(struct fuse_iqueue *fiq) |
07e77dca | 1066 | { |
f88996a9 | 1067 | return fiq->forget_list_head.next != NULL; |
07e77dca MS |
1068 | } |
1069 | ||
f88996a9 | 1070 | static int request_pending(struct fuse_iqueue *fiq) |
a4d27e75 | 1071 | { |
f88996a9 MS |
1072 | return !list_empty(&fiq->pending) || !list_empty(&fiq->interrupts) || |
1073 | forget_pending(fiq); | |
a4d27e75 MS |
1074 | } |
1075 | ||
a4d27e75 MS |
1076 | /* |
1077 | * Transfer an interrupt request to userspace | |
1078 | * | |
1079 | * Unlike other requests this is assembled on demand, without a need | |
1080 | * to allocate a separate fuse_req structure. | |
1081 | * | |
fd22d62e | 1082 | * Called with fiq->waitq.lock held, releases it |
a4d27e75 | 1083 | */ |
fd22d62e MS |
1084 | static int fuse_read_interrupt(struct fuse_iqueue *fiq, |
1085 | struct fuse_copy_state *cs, | |
c3021629 | 1086 | size_t nbytes, struct fuse_req *req) |
fd22d62e | 1087 | __releases(fiq->waitq.lock) |
a4d27e75 | 1088 | { |
a4d27e75 MS |
1089 | struct fuse_in_header ih; |
1090 | struct fuse_interrupt_in arg; | |
1091 | unsigned reqsize = sizeof(ih) + sizeof(arg); | |
1092 | int err; | |
1093 | ||
1094 | list_del_init(&req->intr_entry); | |
4ce60812 | 1095 | req->intr_unique = fuse_get_unique(fiq); |
a4d27e75 MS |
1096 | memset(&ih, 0, sizeof(ih)); |
1097 | memset(&arg, 0, sizeof(arg)); | |
1098 | ih.len = reqsize; | |
1099 | ih.opcode = FUSE_INTERRUPT; | |
1100 | ih.unique = req->intr_unique; | |
1101 | arg.unique = req->in.h.unique; | |
1102 | ||
4ce60812 | 1103 | spin_unlock(&fiq->waitq.lock); |
c3021629 | 1104 | if (nbytes < reqsize) |
a4d27e75 MS |
1105 | return -EINVAL; |
1106 | ||
c3021629 | 1107 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
a4d27e75 | 1108 | if (!err) |
c3021629 MS |
1109 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
1110 | fuse_copy_finish(cs); | |
a4d27e75 MS |
1111 | |
1112 | return err ? err : reqsize; | |
1113 | } | |
1114 | ||
f88996a9 | 1115 | static struct fuse_forget_link *dequeue_forget(struct fuse_iqueue *fiq, |
02c048b9 MS |
1116 | unsigned max, |
1117 | unsigned *countp) | |
07e77dca | 1118 | { |
f88996a9 | 1119 | struct fuse_forget_link *head = fiq->forget_list_head.next; |
02c048b9 MS |
1120 | struct fuse_forget_link **newhead = &head; |
1121 | unsigned count; | |
07e77dca | 1122 | |
02c048b9 MS |
1123 | for (count = 0; *newhead != NULL && count < max; count++) |
1124 | newhead = &(*newhead)->next; | |
1125 | ||
f88996a9 | 1126 | fiq->forget_list_head.next = *newhead; |
02c048b9 | 1127 | *newhead = NULL; |
f88996a9 MS |
1128 | if (fiq->forget_list_head.next == NULL) |
1129 | fiq->forget_list_tail = &fiq->forget_list_head; | |
07e77dca | 1130 | |
02c048b9 MS |
1131 | if (countp != NULL) |
1132 | *countp = count; | |
1133 | ||
1134 | return head; | |
07e77dca MS |
1135 | } |
1136 | ||
fd22d62e | 1137 | static int fuse_read_single_forget(struct fuse_iqueue *fiq, |
07e77dca MS |
1138 | struct fuse_copy_state *cs, |
1139 | size_t nbytes) | |
fd22d62e | 1140 | __releases(fiq->waitq.lock) |
07e77dca MS |
1141 | { |
1142 | int err; | |
f88996a9 | 1143 | struct fuse_forget_link *forget = dequeue_forget(fiq, 1, NULL); |
07e77dca | 1144 | struct fuse_forget_in arg = { |
02c048b9 | 1145 | .nlookup = forget->forget_one.nlookup, |
07e77dca MS |
1146 | }; |
1147 | struct fuse_in_header ih = { | |
1148 | .opcode = FUSE_FORGET, | |
02c048b9 | 1149 | .nodeid = forget->forget_one.nodeid, |
f88996a9 | 1150 | .unique = fuse_get_unique(fiq), |
07e77dca MS |
1151 | .len = sizeof(ih) + sizeof(arg), |
1152 | }; | |
1153 | ||
4ce60812 | 1154 | spin_unlock(&fiq->waitq.lock); |
07e77dca MS |
1155 | kfree(forget); |
1156 | if (nbytes < ih.len) | |
1157 | return -EINVAL; | |
1158 | ||
1159 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1160 | if (!err) | |
1161 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1162 | fuse_copy_finish(cs); | |
1163 | ||
1164 | if (err) | |
1165 | return err; | |
1166 | ||
1167 | return ih.len; | |
1168 | } | |
1169 | ||
fd22d62e | 1170 | static int fuse_read_batch_forget(struct fuse_iqueue *fiq, |
02c048b9 | 1171 | struct fuse_copy_state *cs, size_t nbytes) |
fd22d62e | 1172 | __releases(fiq->waitq.lock) |
02c048b9 MS |
1173 | { |
1174 | int err; | |
1175 | unsigned max_forgets; | |
1176 | unsigned count; | |
1177 | struct fuse_forget_link *head; | |
1178 | struct fuse_batch_forget_in arg = { .count = 0 }; | |
1179 | struct fuse_in_header ih = { | |
1180 | .opcode = FUSE_BATCH_FORGET, | |
f88996a9 | 1181 | .unique = fuse_get_unique(fiq), |
02c048b9 MS |
1182 | .len = sizeof(ih) + sizeof(arg), |
1183 | }; | |
1184 | ||
1185 | if (nbytes < ih.len) { | |
4ce60812 | 1186 | spin_unlock(&fiq->waitq.lock); |
02c048b9 MS |
1187 | return -EINVAL; |
1188 | } | |
1189 | ||
1190 | max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one); | |
f88996a9 | 1191 | head = dequeue_forget(fiq, max_forgets, &count); |
4ce60812 | 1192 | spin_unlock(&fiq->waitq.lock); |
02c048b9 MS |
1193 | |
1194 | arg.count = count; | |
1195 | ih.len += count * sizeof(struct fuse_forget_one); | |
1196 | err = fuse_copy_one(cs, &ih, sizeof(ih)); | |
1197 | if (!err) | |
1198 | err = fuse_copy_one(cs, &arg, sizeof(arg)); | |
1199 | ||
1200 | while (head) { | |
1201 | struct fuse_forget_link *forget = head; | |
1202 | ||
1203 | if (!err) { | |
1204 | err = fuse_copy_one(cs, &forget->forget_one, | |
1205 | sizeof(forget->forget_one)); | |
1206 | } | |
1207 | head = forget->next; | |
1208 | kfree(forget); | |
1209 | } | |
1210 | ||
1211 | fuse_copy_finish(cs); | |
1212 | ||
1213 | if (err) | |
1214 | return err; | |
1215 | ||
1216 | return ih.len; | |
1217 | } | |
1218 | ||
fd22d62e MS |
1219 | static int fuse_read_forget(struct fuse_conn *fc, struct fuse_iqueue *fiq, |
1220 | struct fuse_copy_state *cs, | |
02c048b9 | 1221 | size_t nbytes) |
fd22d62e | 1222 | __releases(fiq->waitq.lock) |
02c048b9 | 1223 | { |
f88996a9 | 1224 | if (fc->minor < 16 || fiq->forget_list_head.next->next == NULL) |
fd22d62e | 1225 | return fuse_read_single_forget(fiq, cs, nbytes); |
02c048b9 | 1226 | else |
fd22d62e | 1227 | return fuse_read_batch_forget(fiq, cs, nbytes); |
02c048b9 MS |
1228 | } |
1229 | ||
334f485d MS |
1230 | /* |
1231 | * Read a single request into the userspace filesystem's buffer. This | |
1232 | * function waits until a request is available, then removes it from | |
1233 | * the pending list and copies request data to userspace buffer. If | |
f9a2842e MS |
1234 | * no reply is needed (FORGET) or request has been aborted or there |
1235 | * was an error during the copying then it's finished by calling | |
334f485d MS |
1236 | * request_end(). Otherwise add it to the processing list, and set |
1237 | * the 'sent' flag. | |
1238 | */ | |
c3696046 | 1239 | static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file, |
c3021629 | 1240 | struct fuse_copy_state *cs, size_t nbytes) |
334f485d | 1241 | { |
82cbdcd3 | 1242 | ssize_t err; |
c3696046 | 1243 | struct fuse_conn *fc = fud->fc; |
f88996a9 | 1244 | struct fuse_iqueue *fiq = &fc->iq; |
c3696046 | 1245 | struct fuse_pqueue *fpq = &fud->pq; |
334f485d MS |
1246 | struct fuse_req *req; |
1247 | struct fuse_in *in; | |
334f485d MS |
1248 | unsigned reqsize; |
1249 | ||
b4d18894 SF |
1250 | if (current_user_ns() != fc->user_ns) |
1251 | return -EIO; | |
1252 | ||
1d3d752b | 1253 | restart: |
4ce60812 | 1254 | spin_lock(&fiq->waitq.lock); |
e5ac1d1e | 1255 | err = -EAGAIN; |
e16714d8 | 1256 | if ((file->f_flags & O_NONBLOCK) && fiq->connected && |
f88996a9 | 1257 | !request_pending(fiq)) |
e5ac1d1e JD |
1258 | goto err_unlock; |
1259 | ||
5250921b MS |
1260 | err = wait_event_interruptible_exclusive_locked(fiq->waitq, |
1261 | !fiq->connected || request_pending(fiq)); | |
1262 | if (err) | |
1263 | goto err_unlock; | |
1264 | ||
334f485d | 1265 | err = -ENODEV; |
e16714d8 | 1266 | if (!fiq->connected) |
334f485d | 1267 | goto err_unlock; |
334f485d | 1268 | |
f88996a9 MS |
1269 | if (!list_empty(&fiq->interrupts)) { |
1270 | req = list_entry(fiq->interrupts.next, struct fuse_req, | |
a4d27e75 | 1271 | intr_entry); |
fd22d62e | 1272 | return fuse_read_interrupt(fiq, cs, nbytes, req); |
a4d27e75 MS |
1273 | } |
1274 | ||
f88996a9 MS |
1275 | if (forget_pending(fiq)) { |
1276 | if (list_empty(&fiq->pending) || fiq->forget_batch-- > 0) | |
fd22d62e | 1277 | return fuse_read_forget(fc, fiq, cs, nbytes); |
07e77dca | 1278 | |
f88996a9 MS |
1279 | if (fiq->forget_batch <= -8) |
1280 | fiq->forget_batch = 16; | |
07e77dca MS |
1281 | } |
1282 | ||
f88996a9 | 1283 | req = list_entry(fiq->pending.next, struct fuse_req, list); |
33e14b4d | 1284 | clear_bit(FR_PENDING, &req->flags); |
ef759258 | 1285 | list_del_init(&req->list); |
4ce60812 MS |
1286 | spin_unlock(&fiq->waitq.lock); |
1287 | ||
334f485d | 1288 | in = &req->in; |
1d3d752b | 1289 | reqsize = in->h.len; |
5d6d3a30 MS |
1290 | |
1291 | if (task_active_pid_ns(current) != fc->pid_ns) { | |
1292 | rcu_read_lock(); | |
1293 | in->h.pid = pid_vnr(find_pid_ns(in->h.pid, fc->pid_ns)); | |
1294 | rcu_read_unlock(); | |
1295 | } | |
1296 | ||
1d3d752b | 1297 | /* If request is too large, reply with an error and restart the read */ |
c3021629 | 1298 | if (nbytes < reqsize) { |
1d3d752b MS |
1299 | req->out.h.error = -EIO; |
1300 | /* SETXATTR is special, since it may contain too large data */ | |
1301 | if (in->h.opcode == FUSE_SETXATTR) | |
1302 | req->out.h.error = -E2BIG; | |
1303 | request_end(fc, req); | |
1304 | goto restart; | |
334f485d | 1305 | } |
45a91cb1 | 1306 | spin_lock(&fpq->lock); |
82cbdcd3 | 1307 | list_add(&req->list, &fpq->io); |
45a91cb1 | 1308 | spin_unlock(&fpq->lock); |
c3021629 MS |
1309 | cs->req = req; |
1310 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); | |
1d3d752b | 1311 | if (!err) |
c3021629 | 1312 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
1d3d752b | 1313 | (struct fuse_arg *) in->args, 0); |
c3021629 | 1314 | fuse_copy_finish(cs); |
45a91cb1 | 1315 | spin_lock(&fpq->lock); |
825d6d33 | 1316 | clear_bit(FR_LOCKED, &req->flags); |
e96edd94 | 1317 | if (!fpq->connected) { |
82cbdcd3 MS |
1318 | err = -ENODEV; |
1319 | goto out_end; | |
c9c9d7df | 1320 | } |
334f485d | 1321 | if (err) { |
c9c9d7df | 1322 | req->out.h.error = -EIO; |
82cbdcd3 | 1323 | goto out_end; |
334f485d | 1324 | } |
825d6d33 | 1325 | if (!test_bit(FR_ISREPLY, &req->flags)) { |
82cbdcd3 MS |
1326 | err = reqsize; |
1327 | goto out_end; | |
334f485d | 1328 | } |
82cbdcd3 | 1329 | list_move_tail(&req->list, &fpq->processing); |
54c318d5 | 1330 | __fuse_get_request(req); |
82cbdcd3 | 1331 | set_bit(FR_SENT, &req->flags); |
43312267 | 1332 | spin_unlock(&fpq->lock); |
82cbdcd3 MS |
1333 | /* matches barrier in request_wait_answer() */ |
1334 | smp_mb__after_atomic(); | |
1335 | if (test_bit(FR_INTERRUPTED, &req->flags)) | |
1336 | queue_interrupt(fiq, req); | |
54c318d5 | 1337 | fuse_put_request(fc, req); |
82cbdcd3 | 1338 | |
334f485d MS |
1339 | return reqsize; |
1340 | ||
82cbdcd3 | 1341 | out_end: |
77cd9d48 MS |
1342 | if (!test_bit(FR_PRIVATE, &req->flags)) |
1343 | list_del_init(&req->list); | |
45a91cb1 | 1344 | spin_unlock(&fpq->lock); |
82cbdcd3 MS |
1345 | request_end(fc, req); |
1346 | return err; | |
1347 | ||
334f485d | 1348 | err_unlock: |
4ce60812 | 1349 | spin_unlock(&fiq->waitq.lock); |
334f485d MS |
1350 | return err; |
1351 | } | |
1352 | ||
94e4fe2c TVB |
1353 | static int fuse_dev_open(struct inode *inode, struct file *file) |
1354 | { | |
1355 | /* | |
1356 | * The fuse device's file's private_data is used to hold | |
1357 | * the fuse_conn(ection) when it is mounted, and is used to | |
1358 | * keep track of whether the file has been mounted already. | |
1359 | */ | |
1360 | file->private_data = NULL; | |
1361 | return 0; | |
1362 | } | |
1363 | ||
fbdbacca | 1364 | static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to) |
c3021629 MS |
1365 | { |
1366 | struct fuse_copy_state cs; | |
1367 | struct file *file = iocb->ki_filp; | |
cc080e9e MS |
1368 | struct fuse_dev *fud = fuse_get_dev(file); |
1369 | ||
1370 | if (!fud) | |
c3021629 MS |
1371 | return -EPERM; |
1372 | ||
fbdbacca AV |
1373 | if (!iter_is_iovec(to)) |
1374 | return -EINVAL; | |
1375 | ||
dc00809a | 1376 | fuse_copy_init(&cs, 1, to); |
c3021629 | 1377 | |
c3696046 | 1378 | return fuse_dev_do_read(fud, file, &cs, iov_iter_count(to)); |
c3021629 MS |
1379 | } |
1380 | ||
c3021629 MS |
1381 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, |
1382 | struct pipe_inode_info *pipe, | |
1383 | size_t len, unsigned int flags) | |
1384 | { | |
d82718e3 | 1385 | int total, ret; |
c3021629 | 1386 | int page_nr = 0; |
c3021629 MS |
1387 | struct pipe_buffer *bufs; |
1388 | struct fuse_copy_state cs; | |
cc080e9e MS |
1389 | struct fuse_dev *fud = fuse_get_dev(in); |
1390 | ||
1391 | if (!fud) | |
c3021629 MS |
1392 | return -EPERM; |
1393 | ||
07e77dca | 1394 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
c3021629 MS |
1395 | if (!bufs) |
1396 | return -ENOMEM; | |
1397 | ||
dc00809a | 1398 | fuse_copy_init(&cs, 1, NULL); |
c3021629 MS |
1399 | cs.pipebufs = bufs; |
1400 | cs.pipe = pipe; | |
c3696046 | 1401 | ret = fuse_dev_do_read(fud, in, &cs, len); |
c3021629 MS |
1402 | if (ret < 0) |
1403 | goto out; | |
1404 | ||
c3021629 MS |
1405 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { |
1406 | ret = -EIO; | |
d82718e3 | 1407 | goto out; |
c3021629 MS |
1408 | } |
1409 | ||
d82718e3 | 1410 | for (ret = total = 0; page_nr < cs.nr_segs; total += ret) { |
28a625cb MS |
1411 | /* |
1412 | * Need to be careful about this. Having buf->ops in module | |
1413 | * code can Oops if the buffer persists after module unload. | |
1414 | */ | |
d82718e3 | 1415 | bufs[page_nr].ops = &nosteal_pipe_buf_ops; |
84588a93 | 1416 | bufs[page_nr].flags = 0; |
d82718e3 AV |
1417 | ret = add_to_pipe(pipe, &bufs[page_nr++]); |
1418 | if (unlikely(ret < 0)) | |
1419 | break; | |
c3021629 | 1420 | } |
d82718e3 AV |
1421 | if (total) |
1422 | ret = total; | |
c3021629 MS |
1423 | out: |
1424 | for (; page_nr < cs.nr_segs; page_nr++) | |
09cbfeaf | 1425 | put_page(bufs[page_nr].page); |
c3021629 MS |
1426 | |
1427 | kfree(bufs); | |
1428 | return ret; | |
1429 | } | |
1430 | ||
95668a69 TH |
1431 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
1432 | struct fuse_copy_state *cs) | |
1433 | { | |
1434 | struct fuse_notify_poll_wakeup_out outarg; | |
f6d47a17 | 1435 | int err = -EINVAL; |
95668a69 TH |
1436 | |
1437 | if (size != sizeof(outarg)) | |
f6d47a17 | 1438 | goto err; |
95668a69 TH |
1439 | |
1440 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1441 | if (err) | |
f6d47a17 | 1442 | goto err; |
95668a69 | 1443 | |
f6d47a17 | 1444 | fuse_copy_finish(cs); |
95668a69 | 1445 | return fuse_notify_poll_wakeup(fc, &outarg); |
f6d47a17 MS |
1446 | |
1447 | err: | |
1448 | fuse_copy_finish(cs); | |
1449 | return err; | |
95668a69 TH |
1450 | } |
1451 | ||
3b463ae0 JM |
1452 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
1453 | struct fuse_copy_state *cs) | |
1454 | { | |
1455 | struct fuse_notify_inval_inode_out outarg; | |
1456 | int err = -EINVAL; | |
1457 | ||
1458 | if (size != sizeof(outarg)) | |
1459 | goto err; | |
1460 | ||
1461 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1462 | if (err) | |
1463 | goto err; | |
1464 | fuse_copy_finish(cs); | |
1465 | ||
1466 | down_read(&fc->killsb); | |
1467 | err = -ENOENT; | |
b21dda43 MS |
1468 | if (fc->sb) { |
1469 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, | |
1470 | outarg.off, outarg.len); | |
1471 | } | |
3b463ae0 JM |
1472 | up_read(&fc->killsb); |
1473 | return err; | |
1474 | ||
1475 | err: | |
1476 | fuse_copy_finish(cs); | |
1477 | return err; | |
1478 | } | |
1479 | ||
1480 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, | |
1481 | struct fuse_copy_state *cs) | |
1482 | { | |
1483 | struct fuse_notify_inval_entry_out outarg; | |
b2d82ee3 FW |
1484 | int err = -ENOMEM; |
1485 | char *buf; | |
3b463ae0 JM |
1486 | struct qstr name; |
1487 | ||
b2d82ee3 FW |
1488 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
1489 | if (!buf) | |
1490 | goto err; | |
1491 | ||
1492 | err = -EINVAL; | |
3b463ae0 JM |
1493 | if (size < sizeof(outarg)) |
1494 | goto err; | |
1495 | ||
1496 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1497 | if (err) | |
1498 | goto err; | |
1499 | ||
1500 | err = -ENAMETOOLONG; | |
1501 | if (outarg.namelen > FUSE_NAME_MAX) | |
1502 | goto err; | |
1503 | ||
c2183d1e MS |
1504 | err = -EINVAL; |
1505 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1506 | goto err; | |
1507 | ||
3b463ae0 JM |
1508 | name.name = buf; |
1509 | name.len = outarg.namelen; | |
1510 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1511 | if (err) | |
1512 | goto err; | |
1513 | fuse_copy_finish(cs); | |
1514 | buf[outarg.namelen] = 0; | |
3b463ae0 JM |
1515 | |
1516 | down_read(&fc->killsb); | |
1517 | err = -ENOENT; | |
b21dda43 | 1518 | if (fc->sb) |
451d0f59 JM |
1519 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name); |
1520 | up_read(&fc->killsb); | |
1521 | kfree(buf); | |
1522 | return err; | |
1523 | ||
1524 | err: | |
1525 | kfree(buf); | |
1526 | fuse_copy_finish(cs); | |
1527 | return err; | |
1528 | } | |
1529 | ||
1530 | static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size, | |
1531 | struct fuse_copy_state *cs) | |
1532 | { | |
1533 | struct fuse_notify_delete_out outarg; | |
1534 | int err = -ENOMEM; | |
1535 | char *buf; | |
1536 | struct qstr name; | |
1537 | ||
1538 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); | |
1539 | if (!buf) | |
1540 | goto err; | |
1541 | ||
1542 | err = -EINVAL; | |
1543 | if (size < sizeof(outarg)) | |
1544 | goto err; | |
1545 | ||
1546 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1547 | if (err) | |
1548 | goto err; | |
1549 | ||
1550 | err = -ENAMETOOLONG; | |
1551 | if (outarg.namelen > FUSE_NAME_MAX) | |
1552 | goto err; | |
1553 | ||
1554 | err = -EINVAL; | |
1555 | if (size != sizeof(outarg) + outarg.namelen + 1) | |
1556 | goto err; | |
1557 | ||
1558 | name.name = buf; | |
1559 | name.len = outarg.namelen; | |
1560 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); | |
1561 | if (err) | |
1562 | goto err; | |
1563 | fuse_copy_finish(cs); | |
1564 | buf[outarg.namelen] = 0; | |
451d0f59 JM |
1565 | |
1566 | down_read(&fc->killsb); | |
1567 | err = -ENOENT; | |
1568 | if (fc->sb) | |
1569 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, | |
1570 | outarg.child, &name); | |
3b463ae0 | 1571 | up_read(&fc->killsb); |
b2d82ee3 | 1572 | kfree(buf); |
3b463ae0 JM |
1573 | return err; |
1574 | ||
1575 | err: | |
b2d82ee3 | 1576 | kfree(buf); |
3b463ae0 JM |
1577 | fuse_copy_finish(cs); |
1578 | return err; | |
1579 | } | |
1580 | ||
a1d75f25 MS |
1581 | static int fuse_notify_store(struct fuse_conn *fc, unsigned int size, |
1582 | struct fuse_copy_state *cs) | |
1583 | { | |
1584 | struct fuse_notify_store_out outarg; | |
1585 | struct inode *inode; | |
1586 | struct address_space *mapping; | |
1587 | u64 nodeid; | |
1588 | int err; | |
1589 | pgoff_t index; | |
1590 | unsigned int offset; | |
1591 | unsigned int num; | |
1592 | loff_t file_size; | |
1593 | loff_t end; | |
1594 | ||
1595 | err = -EINVAL; | |
1596 | if (size < sizeof(outarg)) | |
1597 | goto out_finish; | |
1598 | ||
1599 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1600 | if (err) | |
1601 | goto out_finish; | |
1602 | ||
1603 | err = -EINVAL; | |
1604 | if (size - sizeof(outarg) != outarg.size) | |
1605 | goto out_finish; | |
1606 | ||
1607 | nodeid = outarg.nodeid; | |
1608 | ||
1609 | down_read(&fc->killsb); | |
1610 | ||
1611 | err = -ENOENT; | |
1612 | if (!fc->sb) | |
1613 | goto out_up_killsb; | |
1614 | ||
1615 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1616 | if (!inode) | |
1617 | goto out_up_killsb; | |
1618 | ||
1619 | mapping = inode->i_mapping; | |
09cbfeaf KS |
1620 | index = outarg.offset >> PAGE_SHIFT; |
1621 | offset = outarg.offset & ~PAGE_MASK; | |
a1d75f25 MS |
1622 | file_size = i_size_read(inode); |
1623 | end = outarg.offset + outarg.size; | |
1624 | if (end > file_size) { | |
1625 | file_size = end; | |
1626 | fuse_write_update_size(inode, file_size); | |
1627 | } | |
1628 | ||
1629 | num = outarg.size; | |
1630 | while (num) { | |
1631 | struct page *page; | |
1632 | unsigned int this_num; | |
1633 | ||
1634 | err = -ENOMEM; | |
1635 | page = find_or_create_page(mapping, index, | |
1636 | mapping_gfp_mask(mapping)); | |
1637 | if (!page) | |
1638 | goto out_iput; | |
1639 | ||
09cbfeaf | 1640 | this_num = min_t(unsigned, num, PAGE_SIZE - offset); |
a1d75f25 | 1641 | err = fuse_copy_page(cs, &page, offset, this_num, 0); |
063ec1e5 | 1642 | if (!err && offset == 0 && |
09cbfeaf | 1643 | (this_num == PAGE_SIZE || file_size == end)) |
a1d75f25 MS |
1644 | SetPageUptodate(page); |
1645 | unlock_page(page); | |
09cbfeaf | 1646 | put_page(page); |
a1d75f25 MS |
1647 | |
1648 | if (err) | |
1649 | goto out_iput; | |
1650 | ||
1651 | num -= this_num; | |
1652 | offset = 0; | |
1653 | index++; | |
1654 | } | |
1655 | ||
1656 | err = 0; | |
1657 | ||
1658 | out_iput: | |
1659 | iput(inode); | |
1660 | out_up_killsb: | |
1661 | up_read(&fc->killsb); | |
1662 | out_finish: | |
1663 | fuse_copy_finish(cs); | |
1664 | return err; | |
1665 | } | |
1666 | ||
2d45ba38 MS |
1667 | static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req) |
1668 | { | |
c6f92f9f | 1669 | release_pages(req->pages, req->num_pages); |
2d45ba38 MS |
1670 | } |
1671 | ||
1672 | static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode, | |
1673 | struct fuse_notify_retrieve_out *outarg) | |
1674 | { | |
1675 | int err; | |
1676 | struct address_space *mapping = inode->i_mapping; | |
1677 | struct fuse_req *req; | |
1678 | pgoff_t index; | |
1679 | loff_t file_size; | |
1680 | unsigned int num; | |
1681 | unsigned int offset; | |
0157443c | 1682 | size_t total_len = 0; |
4d53dc99 | 1683 | int num_pages; |
2d45ba38 | 1684 | |
09cbfeaf | 1685 | offset = outarg->offset & ~PAGE_MASK; |
4d53dc99 MP |
1686 | file_size = i_size_read(inode); |
1687 | ||
1688 | num = outarg->size; | |
1689 | if (outarg->offset > file_size) | |
1690 | num = 0; | |
1691 | else if (outarg->offset + num > file_size) | |
1692 | num = file_size - outarg->offset; | |
1693 | ||
1694 | num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
1695 | num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ); | |
1696 | ||
1697 | req = fuse_get_req(fc, num_pages); | |
2d45ba38 MS |
1698 | if (IS_ERR(req)) |
1699 | return PTR_ERR(req); | |
1700 | ||
2d45ba38 MS |
1701 | req->in.h.opcode = FUSE_NOTIFY_REPLY; |
1702 | req->in.h.nodeid = outarg->nodeid; | |
1703 | req->in.numargs = 2; | |
1704 | req->in.argpages = 1; | |
b2430d75 | 1705 | req->page_descs[0].offset = offset; |
2d45ba38 MS |
1706 | req->end = fuse_retrieve_end; |
1707 | ||
09cbfeaf | 1708 | index = outarg->offset >> PAGE_SHIFT; |
2d45ba38 | 1709 | |
4d53dc99 | 1710 | while (num && req->num_pages < num_pages) { |
2d45ba38 MS |
1711 | struct page *page; |
1712 | unsigned int this_num; | |
1713 | ||
1714 | page = find_get_page(mapping, index); | |
1715 | if (!page) | |
1716 | break; | |
1717 | ||
09cbfeaf | 1718 | this_num = min_t(unsigned, num, PAGE_SIZE - offset); |
2d45ba38 | 1719 | req->pages[req->num_pages] = page; |
85f40aec | 1720 | req->page_descs[req->num_pages].length = this_num; |
2d45ba38 MS |
1721 | req->num_pages++; |
1722 | ||
c9e67d48 | 1723 | offset = 0; |
2d45ba38 MS |
1724 | num -= this_num; |
1725 | total_len += this_num; | |
48706d0a | 1726 | index++; |
2d45ba38 MS |
1727 | } |
1728 | req->misc.retrieve_in.offset = outarg->offset; | |
1729 | req->misc.retrieve_in.size = total_len; | |
1730 | req->in.args[0].size = sizeof(req->misc.retrieve_in); | |
1731 | req->in.args[0].value = &req->misc.retrieve_in; | |
1732 | req->in.args[1].size = total_len; | |
1733 | ||
1734 | err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique); | |
9101ddb3 | 1735 | if (err) { |
2d45ba38 | 1736 | fuse_retrieve_end(fc, req); |
9101ddb3 MS |
1737 | fuse_put_request(fc, req); |
1738 | } | |
2d45ba38 MS |
1739 | |
1740 | return err; | |
1741 | } | |
1742 | ||
1743 | static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size, | |
1744 | struct fuse_copy_state *cs) | |
1745 | { | |
1746 | struct fuse_notify_retrieve_out outarg; | |
1747 | struct inode *inode; | |
1748 | int err; | |
1749 | ||
1750 | err = -EINVAL; | |
1751 | if (size != sizeof(outarg)) | |
1752 | goto copy_finish; | |
1753 | ||
1754 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); | |
1755 | if (err) | |
1756 | goto copy_finish; | |
1757 | ||
1758 | fuse_copy_finish(cs); | |
1759 | ||
1760 | down_read(&fc->killsb); | |
1761 | err = -ENOENT; | |
1762 | if (fc->sb) { | |
1763 | u64 nodeid = outarg.nodeid; | |
1764 | ||
1765 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); | |
1766 | if (inode) { | |
1767 | err = fuse_retrieve(fc, inode, &outarg); | |
1768 | iput(inode); | |
1769 | } | |
1770 | } | |
1771 | up_read(&fc->killsb); | |
1772 | ||
1773 | return err; | |
1774 | ||
1775 | copy_finish: | |
1776 | fuse_copy_finish(cs); | |
1777 | return err; | |
1778 | } | |
1779 | ||
8599396b TH |
1780 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
1781 | unsigned int size, struct fuse_copy_state *cs) | |
1782 | { | |
0d278362 MS |
1783 | /* Don't try to move pages (yet) */ |
1784 | cs->move_pages = 0; | |
1785 | ||
8599396b | 1786 | switch (code) { |
95668a69 TH |
1787 | case FUSE_NOTIFY_POLL: |
1788 | return fuse_notify_poll(fc, size, cs); | |
1789 | ||
3b463ae0 JM |
1790 | case FUSE_NOTIFY_INVAL_INODE: |
1791 | return fuse_notify_inval_inode(fc, size, cs); | |
1792 | ||
1793 | case FUSE_NOTIFY_INVAL_ENTRY: | |
1794 | return fuse_notify_inval_entry(fc, size, cs); | |
1795 | ||
a1d75f25 MS |
1796 | case FUSE_NOTIFY_STORE: |
1797 | return fuse_notify_store(fc, size, cs); | |
1798 | ||
2d45ba38 MS |
1799 | case FUSE_NOTIFY_RETRIEVE: |
1800 | return fuse_notify_retrieve(fc, size, cs); | |
1801 | ||
451d0f59 JM |
1802 | case FUSE_NOTIFY_DELETE: |
1803 | return fuse_notify_delete(fc, size, cs); | |
1804 | ||
8599396b | 1805 | default: |
f6d47a17 | 1806 | fuse_copy_finish(cs); |
8599396b TH |
1807 | return -EINVAL; |
1808 | } | |
1809 | } | |
1810 | ||
334f485d | 1811 | /* Look up request on processing list by unique ID */ |
3a2b5b9c | 1812 | static struct fuse_req *request_find(struct fuse_pqueue *fpq, u64 unique) |
334f485d | 1813 | { |
05726aca | 1814 | struct fuse_req *req; |
334f485d | 1815 | |
3a2b5b9c | 1816 | list_for_each_entry(req, &fpq->processing, list) { |
a4d27e75 | 1817 | if (req->in.h.unique == unique || req->intr_unique == unique) |
334f485d MS |
1818 | return req; |
1819 | } | |
1820 | return NULL; | |
1821 | } | |
1822 | ||
1823 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, | |
1824 | unsigned nbytes) | |
1825 | { | |
1826 | unsigned reqsize = sizeof(struct fuse_out_header); | |
1827 | ||
1828 | if (out->h.error) | |
1829 | return nbytes != reqsize ? -EINVAL : 0; | |
1830 | ||
1831 | reqsize += len_args(out->numargs, out->args); | |
1832 | ||
1833 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) | |
1834 | return -EINVAL; | |
1835 | else if (reqsize > nbytes) { | |
1836 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; | |
1837 | unsigned diffsize = reqsize - nbytes; | |
1838 | if (diffsize > lastarg->size) | |
1839 | return -EINVAL; | |
1840 | lastarg->size -= diffsize; | |
1841 | } | |
1842 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, | |
1843 | out->page_zeroing); | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * Write a single reply to a request. First the header is copied from | |
1848 | * the write buffer. The request is then searched on the processing | |
1849 | * list by the unique ID found in the header. If found, then remove | |
1850 | * it from the list and copy the rest of the buffer to the request. | |
1851 | * The request is finished by calling request_end() | |
1852 | */ | |
c3696046 | 1853 | static ssize_t fuse_dev_do_write(struct fuse_dev *fud, |
dd3bb14f | 1854 | struct fuse_copy_state *cs, size_t nbytes) |
334f485d MS |
1855 | { |
1856 | int err; | |
c3696046 MS |
1857 | struct fuse_conn *fc = fud->fc; |
1858 | struct fuse_pqueue *fpq = &fud->pq; | |
334f485d MS |
1859 | struct fuse_req *req; |
1860 | struct fuse_out_header oh; | |
334f485d | 1861 | |
b4d18894 SF |
1862 | if (current_user_ns() != fc->user_ns) |
1863 | return -EIO; | |
1864 | ||
334f485d MS |
1865 | if (nbytes < sizeof(struct fuse_out_header)) |
1866 | return -EINVAL; | |
1867 | ||
dd3bb14f | 1868 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
334f485d MS |
1869 | if (err) |
1870 | goto err_finish; | |
8599396b TH |
1871 | |
1872 | err = -EINVAL; | |
1873 | if (oh.len != nbytes) | |
1874 | goto err_finish; | |
1875 | ||
1876 | /* | |
1877 | * Zero oh.unique indicates unsolicited notification message | |
1878 | * and error contains notification code. | |
1879 | */ | |
1880 | if (!oh.unique) { | |
dd3bb14f | 1881 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
8599396b TH |
1882 | return err ? err : nbytes; |
1883 | } | |
1884 | ||
334f485d | 1885 | err = -EINVAL; |
8599396b | 1886 | if (oh.error <= -1000 || oh.error > 0) |
334f485d MS |
1887 | goto err_finish; |
1888 | ||
45a91cb1 | 1889 | spin_lock(&fpq->lock); |
69a53bf2 | 1890 | err = -ENOENT; |
e96edd94 | 1891 | if (!fpq->connected) |
45a91cb1 | 1892 | goto err_unlock_pq; |
69a53bf2 | 1893 | |
3a2b5b9c | 1894 | req = request_find(fpq, oh.unique); |
334f485d | 1895 | if (!req) |
45a91cb1 | 1896 | goto err_unlock_pq; |
334f485d | 1897 | |
a4d27e75 MS |
1898 | /* Is it an interrupt reply? */ |
1899 | if (req->intr_unique == oh.unique) { | |
f7b5f608 | 1900 | __fuse_get_request(req); |
45a91cb1 MS |
1901 | spin_unlock(&fpq->lock); |
1902 | ||
a4d27e75 | 1903 | err = -EINVAL; |
f7b5f608 KT |
1904 | if (nbytes != sizeof(struct fuse_out_header)) { |
1905 | fuse_put_request(fc, req); | |
46c34a34 | 1906 | goto err_finish; |
f7b5f608 | 1907 | } |
a4d27e75 MS |
1908 | |
1909 | if (oh.error == -ENOSYS) | |
1910 | fc->no_interrupt = 1; | |
1911 | else if (oh.error == -EAGAIN) | |
f88996a9 | 1912 | queue_interrupt(&fc->iq, req); |
f7b5f608 | 1913 | fuse_put_request(fc, req); |
a4d27e75 | 1914 | |
dd3bb14f | 1915 | fuse_copy_finish(cs); |
a4d27e75 MS |
1916 | return nbytes; |
1917 | } | |
1918 | ||
33e14b4d | 1919 | clear_bit(FR_SENT, &req->flags); |
3a2b5b9c | 1920 | list_move(&req->list, &fpq->io); |
334f485d | 1921 | req->out.h = oh; |
825d6d33 | 1922 | set_bit(FR_LOCKED, &req->flags); |
45a91cb1 | 1923 | spin_unlock(&fpq->lock); |
dd3bb14f | 1924 | cs->req = req; |
ce534fb0 MS |
1925 | if (!req->out.page_replace) |
1926 | cs->move_pages = 0; | |
334f485d | 1927 | |
dd3bb14f MS |
1928 | err = copy_out_args(cs, &req->out, nbytes); |
1929 | fuse_copy_finish(cs); | |
334f485d | 1930 | |
45a91cb1 | 1931 | spin_lock(&fpq->lock); |
825d6d33 | 1932 | clear_bit(FR_LOCKED, &req->flags); |
e96edd94 | 1933 | if (!fpq->connected) |
0d8e84b0 MS |
1934 | err = -ENOENT; |
1935 | else if (err) | |
334f485d | 1936 | req->out.h.error = -EIO; |
77cd9d48 MS |
1937 | if (!test_bit(FR_PRIVATE, &req->flags)) |
1938 | list_del_init(&req->list); | |
45a91cb1 | 1939 | spin_unlock(&fpq->lock); |
46c34a34 | 1940 | |
334f485d MS |
1941 | request_end(fc, req); |
1942 | ||
1943 | return err ? err : nbytes; | |
1944 | ||
45a91cb1 MS |
1945 | err_unlock_pq: |
1946 | spin_unlock(&fpq->lock); | |
334f485d | 1947 | err_finish: |
dd3bb14f | 1948 | fuse_copy_finish(cs); |
334f485d MS |
1949 | return err; |
1950 | } | |
1951 | ||
fbdbacca | 1952 | static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from) |
dd3bb14f MS |
1953 | { |
1954 | struct fuse_copy_state cs; | |
cc080e9e MS |
1955 | struct fuse_dev *fud = fuse_get_dev(iocb->ki_filp); |
1956 | ||
1957 | if (!fud) | |
dd3bb14f MS |
1958 | return -EPERM; |
1959 | ||
fbdbacca AV |
1960 | if (!iter_is_iovec(from)) |
1961 | return -EINVAL; | |
1962 | ||
dc00809a | 1963 | fuse_copy_init(&cs, 0, from); |
dd3bb14f | 1964 | |
c3696046 | 1965 | return fuse_dev_do_write(fud, &cs, iov_iter_count(from)); |
dd3bb14f MS |
1966 | } |
1967 | ||
1968 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, | |
1969 | struct file *out, loff_t *ppos, | |
1970 | size_t len, unsigned int flags) | |
1971 | { | |
1972 | unsigned nbuf; | |
1973 | unsigned idx; | |
1974 | struct pipe_buffer *bufs; | |
1975 | struct fuse_copy_state cs; | |
cc080e9e | 1976 | struct fuse_dev *fud; |
dd3bb14f MS |
1977 | size_t rem; |
1978 | ssize_t ret; | |
1979 | ||
cc080e9e MS |
1980 | fud = fuse_get_dev(out); |
1981 | if (!fud) | |
dd3bb14f MS |
1982 | return -EPERM; |
1983 | ||
3b3caf8e AR |
1984 | pipe_lock(pipe); |
1985 | ||
07e77dca | 1986 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
3b3caf8e AR |
1987 | if (!bufs) { |
1988 | pipe_unlock(pipe); | |
dd3bb14f | 1989 | return -ENOMEM; |
3b3caf8e | 1990 | } |
dd3bb14f | 1991 | |
dd3bb14f MS |
1992 | nbuf = 0; |
1993 | rem = 0; | |
1994 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) | |
1995 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; | |
1996 | ||
1997 | ret = -EINVAL; | |
1998 | if (rem < len) { | |
1999 | pipe_unlock(pipe); | |
2000 | goto out; | |
2001 | } | |
2002 | ||
2003 | rem = len; | |
2004 | while (rem) { | |
2005 | struct pipe_buffer *ibuf; | |
2006 | struct pipe_buffer *obuf; | |
2007 | ||
2008 | BUG_ON(nbuf >= pipe->buffers); | |
2009 | BUG_ON(!pipe->nrbufs); | |
2010 | ibuf = &pipe->bufs[pipe->curbuf]; | |
2011 | obuf = &bufs[nbuf]; | |
2012 | ||
2013 | if (rem >= ibuf->len) { | |
2014 | *obuf = *ibuf; | |
2015 | ibuf->ops = NULL; | |
2016 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); | |
2017 | pipe->nrbufs--; | |
2018 | } else { | |
7bf2d1df | 2019 | pipe_buf_get(pipe, ibuf); |
dd3bb14f MS |
2020 | *obuf = *ibuf; |
2021 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; | |
2022 | obuf->len = rem; | |
2023 | ibuf->offset += obuf->len; | |
2024 | ibuf->len -= obuf->len; | |
2025 | } | |
2026 | nbuf++; | |
2027 | rem -= obuf->len; | |
2028 | } | |
2029 | pipe_unlock(pipe); | |
2030 | ||
dc00809a | 2031 | fuse_copy_init(&cs, 0, NULL); |
dd3bb14f | 2032 | cs.pipebufs = bufs; |
6c09e94a | 2033 | cs.nr_segs = nbuf; |
dd3bb14f MS |
2034 | cs.pipe = pipe; |
2035 | ||
ce534fb0 MS |
2036 | if (flags & SPLICE_F_MOVE) |
2037 | cs.move_pages = 1; | |
2038 | ||
c3696046 | 2039 | ret = fuse_dev_do_write(fud, &cs, len); |
dd3bb14f | 2040 | |
a779638c MS |
2041 | for (idx = 0; idx < nbuf; idx++) |
2042 | pipe_buf_release(pipe, &bufs[idx]); | |
2043 | ||
dd3bb14f MS |
2044 | out: |
2045 | kfree(bufs); | |
2046 | return ret; | |
2047 | } | |
2048 | ||
334f485d MS |
2049 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
2050 | { | |
334f485d | 2051 | unsigned mask = POLLOUT | POLLWRNORM; |
f88996a9 | 2052 | struct fuse_iqueue *fiq; |
cc080e9e MS |
2053 | struct fuse_dev *fud = fuse_get_dev(file); |
2054 | ||
2055 | if (!fud) | |
7025d9ad | 2056 | return POLLERR; |
334f485d | 2057 | |
cc080e9e | 2058 | fiq = &fud->fc->iq; |
f88996a9 | 2059 | poll_wait(file, &fiq->waitq, wait); |
334f485d | 2060 | |
4ce60812 | 2061 | spin_lock(&fiq->waitq.lock); |
e16714d8 | 2062 | if (!fiq->connected) |
7025d9ad | 2063 | mask = POLLERR; |
f88996a9 | 2064 | else if (request_pending(fiq)) |
7025d9ad | 2065 | mask |= POLLIN | POLLRDNORM; |
4ce60812 | 2066 | spin_unlock(&fiq->waitq.lock); |
334f485d MS |
2067 | |
2068 | return mask; | |
2069 | } | |
2070 | ||
69a53bf2 MS |
2071 | /* |
2072 | * Abort all requests on the given list (pending or processing) | |
2073 | * | |
d7133114 | 2074 | * This function releases and reacquires fc->lock |
69a53bf2 | 2075 | */ |
334f485d MS |
2076 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
2077 | { | |
2078 | while (!list_empty(head)) { | |
2079 | struct fuse_req *req; | |
2080 | req = list_entry(head->next, struct fuse_req, list); | |
334f485d | 2081 | req->out.h.error = -ECONNABORTED; |
33e14b4d | 2082 | clear_bit(FR_SENT, &req->flags); |
f377cb79 | 2083 | list_del_init(&req->list); |
334f485d | 2084 | request_end(fc, req); |
334f485d MS |
2085 | } |
2086 | } | |
2087 | ||
357ccf2b BG |
2088 | static void end_polls(struct fuse_conn *fc) |
2089 | { | |
2090 | struct rb_node *p; | |
2091 | ||
2092 | p = rb_first(&fc->polled_files); | |
2093 | ||
2094 | while (p) { | |
2095 | struct fuse_file *ff; | |
2096 | ff = rb_entry(p, struct fuse_file, polled_node); | |
2097 | wake_up_interruptible_all(&ff->poll_wait); | |
2098 | ||
2099 | p = rb_next(p); | |
2100 | } | |
2101 | } | |
2102 | ||
69a53bf2 MS |
2103 | /* |
2104 | * Abort all requests. | |
2105 | * | |
b716d425 MS |
2106 | * Emergency exit in case of a malicious or accidental deadlock, or just a hung |
2107 | * filesystem. | |
2108 | * | |
2109 | * The same effect is usually achievable through killing the filesystem daemon | |
2110 | * and all users of the filesystem. The exception is the combination of an | |
2111 | * asynchronous request and the tricky deadlock (see | |
2112 | * Documentation/filesystems/fuse.txt). | |
69a53bf2 | 2113 | * |
b716d425 MS |
2114 | * Aborting requests under I/O goes as follows: 1: Separate out unlocked |
2115 | * requests, they should be finished off immediately. Locked requests will be | |
2116 | * finished after unlock; see unlock_request(). 2: Finish off the unlocked | |
2117 | * requests. It is possible that some request will finish before we can. This | |
2118 | * is OK, the request will in that case be removed from the list before we touch | |
2119 | * it. | |
69a53bf2 MS |
2120 | */ |
2121 | void fuse_abort_conn(struct fuse_conn *fc) | |
2122 | { | |
f88996a9 MS |
2123 | struct fuse_iqueue *fiq = &fc->iq; |
2124 | ||
d7133114 | 2125 | spin_lock(&fc->lock); |
69a53bf2 | 2126 | if (fc->connected) { |
c3696046 | 2127 | struct fuse_dev *fud; |
b716d425 | 2128 | struct fuse_req *req, *next; |
41f98274 MS |
2129 | LIST_HEAD(to_end1); |
2130 | LIST_HEAD(to_end2); | |
b716d425 | 2131 | |
69a53bf2 | 2132 | fc->connected = 0; |
51eb01e7 | 2133 | fc->blocked = 0; |
9759bd51 | 2134 | fuse_set_initialized(fc); |
c3696046 MS |
2135 | list_for_each_entry(fud, &fc->devices, entry) { |
2136 | struct fuse_pqueue *fpq = &fud->pq; | |
2137 | ||
2138 | spin_lock(&fpq->lock); | |
2139 | fpq->connected = 0; | |
2140 | list_for_each_entry_safe(req, next, &fpq->io, list) { | |
2141 | req->out.h.error = -ECONNABORTED; | |
2142 | spin_lock(&req->waitq.lock); | |
2143 | set_bit(FR_ABORTED, &req->flags); | |
2144 | if (!test_bit(FR_LOCKED, &req->flags)) { | |
2145 | set_bit(FR_PRIVATE, &req->flags); | |
65afa0c5 | 2146 | __fuse_get_request(req); |
c3696046 MS |
2147 | list_move(&req->list, &to_end1); |
2148 | } | |
2149 | spin_unlock(&req->waitq.lock); | |
77cd9d48 | 2150 | } |
c3696046 MS |
2151 | list_splice_init(&fpq->processing, &to_end2); |
2152 | spin_unlock(&fpq->lock); | |
b716d425 | 2153 | } |
41f98274 MS |
2154 | fc->max_background = UINT_MAX; |
2155 | flush_bg_queue(fc); | |
8c91189a | 2156 | |
4ce60812 | 2157 | spin_lock(&fiq->waitq.lock); |
8c91189a | 2158 | fiq->connected = 0; |
f88996a9 | 2159 | list_splice_init(&fiq->pending, &to_end2); |
a8a86d78 TE |
2160 | list_for_each_entry(req, &to_end2, list) |
2161 | clear_bit(FR_PENDING, &req->flags); | |
8c91189a MS |
2162 | while (forget_pending(fiq)) |
2163 | kfree(dequeue_forget(fiq, 1, NULL)); | |
4ce60812 MS |
2164 | wake_up_all_locked(&fiq->waitq); |
2165 | spin_unlock(&fiq->waitq.lock); | |
8c91189a | 2166 | kill_fasync(&fiq->fasync, SIGIO, POLL_IN); |
ee314a87 MS |
2167 | end_polls(fc); |
2168 | wake_up_all(&fc->blocked_waitq); | |
2169 | spin_unlock(&fc->lock); | |
8c91189a | 2170 | |
41f98274 MS |
2171 | while (!list_empty(&to_end1)) { |
2172 | req = list_first_entry(&to_end1, struct fuse_req, list); | |
f377cb79 | 2173 | list_del_init(&req->list); |
b716d425 | 2174 | request_end(fc, req); |
b716d425 | 2175 | } |
41f98274 | 2176 | end_requests(fc, &to_end2); |
ee314a87 MS |
2177 | } else { |
2178 | spin_unlock(&fc->lock); | |
69a53bf2 | 2179 | } |
69a53bf2 | 2180 | } |
08cbf542 | 2181 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
69a53bf2 | 2182 | |
d97f27fd MS |
2183 | void fuse_wait_aborted(struct fuse_conn *fc) |
2184 | { | |
ff945706 MS |
2185 | /* matches implicit memory barrier in fuse_drop_waiting() */ |
2186 | smp_mb(); | |
d97f27fd MS |
2187 | wait_event(fc->blocked_waitq, atomic_read(&fc->num_waiting) == 0); |
2188 | } | |
2189 | ||
08cbf542 | 2190 | int fuse_dev_release(struct inode *inode, struct file *file) |
334f485d | 2191 | { |
cc080e9e MS |
2192 | struct fuse_dev *fud = fuse_get_dev(file); |
2193 | ||
2194 | if (fud) { | |
2195 | struct fuse_conn *fc = fud->fc; | |
c3696046 | 2196 | struct fuse_pqueue *fpq = &fud->pq; |
1011a05d | 2197 | LIST_HEAD(to_end); |
c3696046 | 2198 | |
1011a05d | 2199 | spin_lock(&fpq->lock); |
c3696046 | 2200 | WARN_ON(!list_empty(&fpq->io)); |
1011a05d MS |
2201 | list_splice_init(&fpq->processing, &to_end); |
2202 | spin_unlock(&fpq->lock); | |
2203 | ||
2204 | end_requests(fc, &to_end); | |
2205 | ||
c3696046 MS |
2206 | /* Are we the last open device? */ |
2207 | if (atomic_dec_and_test(&fc->dev_count)) { | |
2208 | WARN_ON(fc->iq.fasync != NULL); | |
2209 | fuse_abort_conn(fc); | |
2210 | } | |
cc080e9e | 2211 | fuse_dev_free(fud); |
385a17bf | 2212 | } |
334f485d MS |
2213 | return 0; |
2214 | } | |
08cbf542 | 2215 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
334f485d | 2216 | |
385a17bf JD |
2217 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
2218 | { | |
cc080e9e MS |
2219 | struct fuse_dev *fud = fuse_get_dev(file); |
2220 | ||
2221 | if (!fud) | |
a87046d8 | 2222 | return -EPERM; |
385a17bf JD |
2223 | |
2224 | /* No locking - fasync_helper does its own locking */ | |
cc080e9e | 2225 | return fasync_helper(fd, file, on, &fud->fc->iq.fasync); |
385a17bf JD |
2226 | } |
2227 | ||
00c570f4 MS |
2228 | static int fuse_device_clone(struct fuse_conn *fc, struct file *new) |
2229 | { | |
cc080e9e MS |
2230 | struct fuse_dev *fud; |
2231 | ||
00c570f4 MS |
2232 | if (new->private_data) |
2233 | return -EINVAL; | |
2234 | ||
cc080e9e MS |
2235 | fud = fuse_dev_alloc(fc); |
2236 | if (!fud) | |
2237 | return -ENOMEM; | |
2238 | ||
2239 | new->private_data = fud; | |
c3696046 | 2240 | atomic_inc(&fc->dev_count); |
00c570f4 MS |
2241 | |
2242 | return 0; | |
2243 | } | |
2244 | ||
2245 | static long fuse_dev_ioctl(struct file *file, unsigned int cmd, | |
2246 | unsigned long arg) | |
2247 | { | |
2248 | int err = -ENOTTY; | |
2249 | ||
2250 | if (cmd == FUSE_DEV_IOC_CLONE) { | |
2251 | int oldfd; | |
2252 | ||
2253 | err = -EFAULT; | |
2254 | if (!get_user(oldfd, (__u32 __user *) arg)) { | |
2255 | struct file *old = fget(oldfd); | |
2256 | ||
2257 | err = -EINVAL; | |
2258 | if (old) { | |
8ed1f0e2 JH |
2259 | struct fuse_dev *fud = NULL; |
2260 | ||
2261 | /* | |
2262 | * Check against file->f_op because CUSE | |
2263 | * uses the same ioctl handler. | |
2264 | */ | |
2265 | if (old->f_op == file->f_op && | |
2266 | old->f_cred->user_ns == file->f_cred->user_ns) | |
2267 | fud = fuse_get_dev(old); | |
00c570f4 | 2268 | |
cc080e9e | 2269 | if (fud) { |
00c570f4 | 2270 | mutex_lock(&fuse_mutex); |
cc080e9e | 2271 | err = fuse_device_clone(fud->fc, file); |
00c570f4 MS |
2272 | mutex_unlock(&fuse_mutex); |
2273 | } | |
2274 | fput(old); | |
2275 | } | |
2276 | } | |
2277 | } | |
2278 | return err; | |
2279 | } | |
2280 | ||
4b6f5d20 | 2281 | const struct file_operations fuse_dev_operations = { |
334f485d | 2282 | .owner = THIS_MODULE, |
94e4fe2c | 2283 | .open = fuse_dev_open, |
334f485d | 2284 | .llseek = no_llseek, |
fbdbacca | 2285 | .read_iter = fuse_dev_read, |
c3021629 | 2286 | .splice_read = fuse_dev_splice_read, |
fbdbacca | 2287 | .write_iter = fuse_dev_write, |
dd3bb14f | 2288 | .splice_write = fuse_dev_splice_write, |
334f485d MS |
2289 | .poll = fuse_dev_poll, |
2290 | .release = fuse_dev_release, | |
385a17bf | 2291 | .fasync = fuse_dev_fasync, |
00c570f4 MS |
2292 | .unlocked_ioctl = fuse_dev_ioctl, |
2293 | .compat_ioctl = fuse_dev_ioctl, | |
334f485d | 2294 | }; |
08cbf542 | 2295 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
334f485d MS |
2296 | |
2297 | static struct miscdevice fuse_miscdevice = { | |
2298 | .minor = FUSE_MINOR, | |
2299 | .name = "fuse", | |
2300 | .fops = &fuse_dev_operations, | |
2301 | }; | |
2302 | ||
2303 | int __init fuse_dev_init(void) | |
2304 | { | |
2305 | int err = -ENOMEM; | |
2306 | fuse_req_cachep = kmem_cache_create("fuse_request", | |
2307 | sizeof(struct fuse_req), | |
20c2df83 | 2308 | 0, 0, NULL); |
334f485d MS |
2309 | if (!fuse_req_cachep) |
2310 | goto out; | |
2311 | ||
2312 | err = misc_register(&fuse_miscdevice); | |
2313 | if (err) | |
2314 | goto out_cache_clean; | |
2315 | ||
2316 | return 0; | |
2317 | ||
2318 | out_cache_clean: | |
2319 | kmem_cache_destroy(fuse_req_cachep); | |
2320 | out: | |
2321 | return err; | |
2322 | } | |
2323 | ||
2324 | void fuse_dev_cleanup(void) | |
2325 | { | |
2326 | misc_deregister(&fuse_miscdevice); | |
2327 | kmem_cache_destroy(fuse_req_cachep); | |
2328 | } |