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Miklos Szeredi334f4852005-09-09 13:10:27 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredi1729a162008-11-26 12:03:54 +01003 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredi334f4852005-09-09 13:10:27 -07004
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>
Miklos Szeredidd3bb142010-05-25 15:06:06 +020019#include <linux/pipe_fs_i.h>
Miklos Szeredice534fb2010-05-25 15:06:07 +020020#include <linux/swap.h>
21#include <linux/splice.h>
Miklos Szeredi334f4852005-09-09 13:10:27 -070022
23MODULE_ALIAS_MISCDEV(FUSE_MINOR);
Kay Sievers578454f2010-05-20 18:07:20 +020024MODULE_ALIAS("devname:fuse");
Miklos Szeredi334f4852005-09-09 13:10:27 -070025
Christoph Lametere18b8902006-12-06 20:33:20 -080026static struct kmem_cache *fuse_req_cachep;
Miklos Szeredi334f4852005-09-09 13:10:27 -070027
Miklos Szeredi8bfc0162006-01-16 22:14:28 -080028static struct fuse_conn *fuse_get_conn(struct file *file)
Miklos Szeredi334f4852005-09-09 13:10:27 -070029{
Miklos Szeredi0720b312006-04-10 22:54:55 -070030 /*
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;
Miklos Szeredi334f4852005-09-09 13:10:27 -070035}
36
Miklos Szeredi8bfc0162006-01-16 22:14:28 -080037static void fuse_request_init(struct fuse_req *req)
Miklos Szeredi334f4852005-09-09 13:10:27 -070038{
39 memset(req, 0, sizeof(*req));
40 INIT_LIST_HEAD(&req->list);
Miklos Szeredia4d27e72006-06-25 05:48:54 -070041 INIT_LIST_HEAD(&req->intr_entry);
Miklos Szeredi334f4852005-09-09 13:10:27 -070042 init_waitqueue_head(&req->waitq);
43 atomic_set(&req->count, 1);
44}
45
46struct fuse_req *fuse_request_alloc(void)
47{
Christoph Lametere94b1762006-12-06 20:33:17 -080048 struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_KERNEL);
Miklos Szeredi334f4852005-09-09 13:10:27 -070049 if (req)
50 fuse_request_init(req);
51 return req;
52}
Tejun Heo08cbf542009-04-14 10:54:53 +090053EXPORT_SYMBOL_GPL(fuse_request_alloc);
Miklos Szeredi334f4852005-09-09 13:10:27 -070054
Miklos Szeredi3be5a522008-04-30 00:54:41 -070055struct fuse_req *fuse_request_alloc_nofs(void)
56{
57 struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_NOFS);
58 if (req)
59 fuse_request_init(req);
60 return req;
61}
62
Miklos Szeredi334f4852005-09-09 13:10:27 -070063void fuse_request_free(struct fuse_req *req)
64{
65 kmem_cache_free(fuse_req_cachep, req);
66}
67
Miklos Szeredi8bfc0162006-01-16 22:14:28 -080068static void block_sigs(sigset_t *oldset)
Miklos Szeredi334f4852005-09-09 13:10:27 -070069{
70 sigset_t mask;
71
72 siginitsetinv(&mask, sigmask(SIGKILL));
73 sigprocmask(SIG_BLOCK, &mask, oldset);
74}
75
Miklos Szeredi8bfc0162006-01-16 22:14:28 -080076static void restore_sigs(sigset_t *oldset)
Miklos Szeredi334f4852005-09-09 13:10:27 -070077{
78 sigprocmask(SIG_SETMASK, oldset, NULL);
79}
80
Miklos Szeredi334f4852005-09-09 13:10:27 -070081static void __fuse_get_request(struct fuse_req *req)
82{
83 atomic_inc(&req->count);
84}
85
86/* Must be called with > 1 refcount */
87static void __fuse_put_request(struct fuse_req *req)
88{
89 BUG_ON(atomic_read(&req->count) < 2);
90 atomic_dec(&req->count);
91}
92
Miklos Szeredi33649c92006-06-25 05:48:52 -070093static void fuse_req_init_context(struct fuse_req *req)
94{
David Howells2186a712008-11-14 10:38:53 +110095 req->in.h.uid = current_fsuid();
96 req->in.h.gid = current_fsgid();
Miklos Szeredi33649c92006-06-25 05:48:52 -070097 req->in.h.pid = current->pid;
98}
99
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700100struct fuse_req *fuse_get_req(struct fuse_conn *fc)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700101{
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700102 struct fuse_req *req;
103 sigset_t oldset;
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200104 int intr;
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700105 int err;
106
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200107 atomic_inc(&fc->num_waiting);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700108 block_sigs(&oldset);
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200109 intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700110 restore_sigs(&oldset);
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200111 err = -EINTR;
112 if (intr)
113 goto out;
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700114
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700115 err = -ENOTCONN;
116 if (!fc->connected)
117 goto out;
118
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700119 req = fuse_request_alloc();
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200120 err = -ENOMEM;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700121 if (!req)
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200122 goto out;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700123
Miklos Szeredi33649c92006-06-25 05:48:52 -0700124 fuse_req_init_context(req);
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200125 req->waiting = 1;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700126 return req;
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200127
128 out:
129 atomic_dec(&fc->num_waiting);
130 return ERR_PTR(err);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700131}
Tejun Heo08cbf542009-04-14 10:54:53 +0900132EXPORT_SYMBOL_GPL(fuse_get_req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700133
Miklos Szeredi33649c92006-06-25 05:48:52 -0700134/*
135 * Return request in fuse_file->reserved_req. However that may
136 * currently be in use. If that is the case, wait for it to become
137 * available.
138 */
139static struct fuse_req *get_reserved_req(struct fuse_conn *fc,
140 struct file *file)
141{
142 struct fuse_req *req = NULL;
143 struct fuse_file *ff = file->private_data;
144
145 do {
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700146 wait_event(fc->reserved_req_waitq, ff->reserved_req);
Miklos Szeredi33649c92006-06-25 05:48:52 -0700147 spin_lock(&fc->lock);
148 if (ff->reserved_req) {
149 req = ff->reserved_req;
150 ff->reserved_req = NULL;
151 get_file(file);
152 req->stolen_file = file;
153 }
154 spin_unlock(&fc->lock);
155 } while (!req);
156
157 return req;
158}
159
160/*
161 * Put stolen request back into fuse_file->reserved_req
162 */
163static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req)
164{
165 struct file *file = req->stolen_file;
166 struct fuse_file *ff = file->private_data;
167
168 spin_lock(&fc->lock);
169 fuse_request_init(req);
170 BUG_ON(ff->reserved_req);
171 ff->reserved_req = req;
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700172 wake_up_all(&fc->reserved_req_waitq);
Miklos Szeredi33649c92006-06-25 05:48:52 -0700173 spin_unlock(&fc->lock);
174 fput(file);
175}
176
177/*
178 * Gets a requests for a file operation, always succeeds
179 *
180 * This is used for sending the FLUSH request, which must get to
181 * userspace, due to POSIX locks which may need to be unlocked.
182 *
183 * If allocation fails due to OOM, use the reserved request in
184 * fuse_file.
185 *
186 * This is very unlikely to deadlock accidentally, since the
187 * filesystem should not have it's own file open. If deadlock is
188 * intentional, it can still be broken by "aborting" the filesystem.
189 */
190struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file)
191{
192 struct fuse_req *req;
193
194 atomic_inc(&fc->num_waiting);
195 wait_event(fc->blocked_waitq, !fc->blocked);
196 req = fuse_request_alloc();
197 if (!req)
198 req = get_reserved_req(fc, file);
199
200 fuse_req_init_context(req);
201 req->waiting = 1;
202 return req;
203}
204
Miklos Szeredi334f4852005-09-09 13:10:27 -0700205void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
206{
Miklos Szeredi7128ec22006-02-04 23:27:40 -0800207 if (atomic_dec_and_test(&req->count)) {
Miklos Szeredi9bc5ddd2006-04-11 21:16:09 +0200208 if (req->waiting)
209 atomic_dec(&fc->num_waiting);
Miklos Szeredi33649c92006-06-25 05:48:52 -0700210
211 if (req->stolen_file)
212 put_reserved_req(fc, req);
213 else
214 fuse_request_free(req);
Miklos Szeredi7128ec22006-02-04 23:27:40 -0800215 }
216}
Tejun Heo08cbf542009-04-14 10:54:53 +0900217EXPORT_SYMBOL_GPL(fuse_put_request);
Miklos Szeredi7128ec22006-02-04 23:27:40 -0800218
Miklos Szeredid12def12008-02-06 01:38:39 -0800219static unsigned len_args(unsigned numargs, struct fuse_arg *args)
220{
221 unsigned nbytes = 0;
222 unsigned i;
223
224 for (i = 0; i < numargs; i++)
225 nbytes += args[i].size;
226
227 return nbytes;
228}
229
230static u64 fuse_get_unique(struct fuse_conn *fc)
231{
232 fc->reqctr++;
233 /* zero is special */
234 if (fc->reqctr == 0)
235 fc->reqctr = 1;
236
237 return fc->reqctr;
238}
239
240static void queue_request(struct fuse_conn *fc, struct fuse_req *req)
241{
Miklos Szeredid12def12008-02-06 01:38:39 -0800242 req->in.h.len = sizeof(struct fuse_in_header) +
243 len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
244 list_add_tail(&req->list, &fc->pending);
245 req->state = FUSE_REQ_PENDING;
246 if (!req->waiting) {
247 req->waiting = 1;
248 atomic_inc(&fc->num_waiting);
249 }
250 wake_up(&fc->waitq);
251 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
252}
253
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100254void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
255 u64 nodeid, u64 nlookup)
256{
Miklos Szeredi02c048b2010-12-07 20:16:56 +0100257 forget->forget_one.nodeid = nodeid;
258 forget->forget_one.nlookup = nlookup;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100259
260 spin_lock(&fc->lock);
261 fc->forget_list_tail->next = forget;
262 fc->forget_list_tail = forget;
263 wake_up(&fc->waitq);
264 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
265 spin_unlock(&fc->lock);
266}
267
Miklos Szeredid12def12008-02-06 01:38:39 -0800268static void flush_bg_queue(struct fuse_conn *fc)
269{
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700270 while (fc->active_background < fc->max_background &&
Miklos Szeredid12def12008-02-06 01:38:39 -0800271 !list_empty(&fc->bg_queue)) {
272 struct fuse_req *req;
273
274 req = list_entry(fc->bg_queue.next, struct fuse_req, list);
275 list_del(&req->list);
276 fc->active_background++;
Miklos Szeredi2d45ba32010-07-12 14:41:40 +0200277 req->in.h.unique = fuse_get_unique(fc);
Miklos Szeredid12def12008-02-06 01:38:39 -0800278 queue_request(fc, req);
279 }
280}
281
Miklos Szeredi6dbbcb12006-04-26 10:49:06 +0200282/*
Miklos Szeredi334f4852005-09-09 13:10:27 -0700283 * This function is called when a request is finished. Either a reply
Miklos Szeredif9a28422006-06-25 05:48:53 -0700284 * has arrived or it was aborted (and not yet sent) or some error
Miklos Szeredif43b1552006-01-16 22:14:26 -0800285 * occurred during communication with userspace, or the device file
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700286 * was closed. The requester thread is woken up (if still waiting),
287 * the 'end' callback is called if given, else the reference to the
288 * request is released
Miklos Szeredi7128ec22006-02-04 23:27:40 -0800289 *
Miklos Szeredid7133112006-04-10 22:54:55 -0700290 * Called with fc->lock, unlocks it
Miklos Szeredi334f4852005-09-09 13:10:27 -0700291 */
292static void request_end(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +0200293__releases(fc->lock)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700294{
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700295 void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
296 req->end = NULL;
Miklos Szeredid77a1d52006-01-16 22:14:31 -0800297 list_del(&req->list);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700298 list_del(&req->intr_entry);
Miklos Szeredi83cfd492006-01-16 22:14:31 -0800299 req->state = FUSE_REQ_FINISHED;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700300 if (req->background) {
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700301 if (fc->num_background == fc->max_background) {
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700302 fc->blocked = 0;
303 wake_up_all(&fc->blocked_waitq);
304 }
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700305 if (fc->num_background == fc->congestion_threshold &&
Tejun Heoa325f9b2009-04-14 10:54:52 +0900306 fc->connected && fc->bdi_initialized) {
Jens Axboe8aa7e842009-07-09 14:52:32 +0200307 clear_bdi_congested(&fc->bdi, BLK_RW_SYNC);
308 clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC);
Miklos Szeredif92b99b2007-10-16 23:30:59 -0700309 }
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700310 fc->num_background--;
Miklos Szeredid12def12008-02-06 01:38:39 -0800311 fc->active_background--;
312 flush_bg_queue(fc);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700313 }
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700314 spin_unlock(&fc->lock);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700315 wake_up(&req->waitq);
316 if (end)
317 end(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +0100318 fuse_put_request(fc, req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700319}
320
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700321static void wait_answer_interruptible(struct fuse_conn *fc,
322 struct fuse_req *req)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +0200323__releases(fc->lock)
324__acquires(fc->lock)
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700325{
326 if (signal_pending(current))
327 return;
328
329 spin_unlock(&fc->lock);
330 wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED);
331 spin_lock(&fc->lock);
332}
333
334static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req)
335{
336 list_add_tail(&req->intr_entry, &fc->interrupts);
337 wake_up(&fc->waitq);
338 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
339}
340
Miklos Szeredi7c352bd2005-09-09 13:10:39 -0700341static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +0200342__releases(fc->lock)
343__acquires(fc->lock)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700344{
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700345 if (!fc->no_interrupt) {
346 /* Any signal may interrupt this */
347 wait_answer_interruptible(fc, req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700348
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700349 if (req->aborted)
350 goto aborted;
351 if (req->state == FUSE_REQ_FINISHED)
352 return;
353
354 req->interrupted = 1;
355 if (req->state == FUSE_REQ_SENT)
356 queue_interrupt(fc, req);
357 }
358
Miklos Szeredia131de02007-10-16 23:31:04 -0700359 if (!req->force) {
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700360 sigset_t oldset;
361
362 /* Only fatal signals may interrupt this */
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700363 block_sigs(&oldset);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700364 wait_answer_interruptible(fc, req);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700365 restore_sigs(&oldset);
Miklos Szeredia131de02007-10-16 23:31:04 -0700366
367 if (req->aborted)
368 goto aborted;
369 if (req->state == FUSE_REQ_FINISHED)
370 return;
371
372 /* Request is not yet in userspace, bail out */
373 if (req->state == FUSE_REQ_PENDING) {
374 list_del(&req->list);
375 __fuse_put_request(req);
376 req->out.h.error = -EINTR;
377 return;
378 }
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700379 }
Miklos Szeredi334f4852005-09-09 13:10:27 -0700380
Miklos Szeredia131de02007-10-16 23:31:04 -0700381 /*
382 * Either request is already in userspace, or it was forced.
383 * Wait it out.
384 */
385 spin_unlock(&fc->lock);
386 wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);
387 spin_lock(&fc->lock);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700388
Miklos Szeredia131de02007-10-16 23:31:04 -0700389 if (!req->aborted)
390 return;
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700391
392 aborted:
Miklos Szeredia131de02007-10-16 23:31:04 -0700393 BUG_ON(req->state != FUSE_REQ_FINISHED);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700394 if (req->locked) {
395 /* This is uninterruptible sleep, because data is
396 being copied to/from the buffers of req. During
397 locked state, there mustn't be any filesystem
398 operation (e.g. page fault), since that could lead
399 to deadlock */
Miklos Szeredid7133112006-04-10 22:54:55 -0700400 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700401 wait_event(req->waitq, !req->locked);
Miklos Szeredid7133112006-04-10 22:54:55 -0700402 spin_lock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700403 }
Miklos Szeredi334f4852005-09-09 13:10:27 -0700404}
405
Tejun Heob93f8582008-11-26 12:03:55 +0100406void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700407{
408 req->isreply = 1;
Miklos Szeredid7133112006-04-10 22:54:55 -0700409 spin_lock(&fc->lock);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700410 if (!fc->connected)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700411 req->out.h.error = -ENOTCONN;
412 else if (fc->conn_error)
413 req->out.h.error = -ECONNREFUSED;
414 else {
Miklos Szeredi2d45ba32010-07-12 14:41:40 +0200415 req->in.h.unique = fuse_get_unique(fc);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700416 queue_request(fc, req);
417 /* acquire extra reference, since request is still needed
418 after request_end() */
419 __fuse_get_request(req);
420
Miklos Szeredi7c352bd2005-09-09 13:10:39 -0700421 request_wait_answer(fc, req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700422 }
Miklos Szeredid7133112006-04-10 22:54:55 -0700423 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700424}
Tejun Heo08cbf542009-04-14 10:54:53 +0900425EXPORT_SYMBOL_GPL(fuse_request_send);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700426
Tejun Heob93f8582008-11-26 12:03:55 +0100427static void fuse_request_send_nowait_locked(struct fuse_conn *fc,
428 struct fuse_req *req)
Miklos Szeredid12def12008-02-06 01:38:39 -0800429{
430 req->background = 1;
431 fc->num_background++;
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700432 if (fc->num_background == fc->max_background)
Miklos Szeredid12def12008-02-06 01:38:39 -0800433 fc->blocked = 1;
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700434 if (fc->num_background == fc->congestion_threshold &&
Tejun Heoa325f9b2009-04-14 10:54:52 +0900435 fc->bdi_initialized) {
Jens Axboe8aa7e842009-07-09 14:52:32 +0200436 set_bdi_congested(&fc->bdi, BLK_RW_SYNC);
437 set_bdi_congested(&fc->bdi, BLK_RW_ASYNC);
Miklos Szeredid12def12008-02-06 01:38:39 -0800438 }
439 list_add_tail(&req->list, &fc->bg_queue);
440 flush_bg_queue(fc);
441}
442
Tejun Heob93f8582008-11-26 12:03:55 +0100443static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700444{
Miklos Szeredid7133112006-04-10 22:54:55 -0700445 spin_lock(&fc->lock);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700446 if (fc->connected) {
Tejun Heob93f8582008-11-26 12:03:55 +0100447 fuse_request_send_nowait_locked(fc, req);
Miklos Szeredid7133112006-04-10 22:54:55 -0700448 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700449 } else {
450 req->out.h.error = -ENOTCONN;
451 request_end(fc, req);
452 }
453}
454
Tejun Heob93f8582008-11-26 12:03:55 +0100455void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700456{
457 req->isreply = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100458 fuse_request_send_nowait(fc, req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700459}
Tejun Heo08cbf542009-04-14 10:54:53 +0900460EXPORT_SYMBOL_GPL(fuse_request_send_background);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700461
Miklos Szeredi2d45ba32010-07-12 14:41:40 +0200462static int fuse_request_send_notify_reply(struct fuse_conn *fc,
463 struct fuse_req *req, u64 unique)
464{
465 int err = -ENODEV;
466
467 req->isreply = 0;
468 req->in.h.unique = unique;
469 spin_lock(&fc->lock);
470 if (fc->connected) {
471 queue_request(fc, req);
472 err = 0;
473 }
474 spin_unlock(&fc->lock);
475
476 return err;
477}
478
Miklos Szeredi334f4852005-09-09 13:10:27 -0700479/*
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700480 * Called under fc->lock
481 *
482 * fc->connected must have been checked previously
483 */
Tejun Heob93f8582008-11-26 12:03:55 +0100484void fuse_request_send_background_locked(struct fuse_conn *fc,
485 struct fuse_req *req)
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700486{
487 req->isreply = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100488 fuse_request_send_nowait_locked(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700489}
490
491/*
Miklos Szeredi334f4852005-09-09 13:10:27 -0700492 * Lock the request. Up to the next unlock_request() there mustn't be
493 * anything that could cause a page-fault. If the request was already
Miklos Szeredif9a28422006-06-25 05:48:53 -0700494 * aborted bail out.
Miklos Szeredi334f4852005-09-09 13:10:27 -0700495 */
Miklos Szeredid7133112006-04-10 22:54:55 -0700496static int lock_request(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700497{
498 int err = 0;
499 if (req) {
Miklos Szeredid7133112006-04-10 22:54:55 -0700500 spin_lock(&fc->lock);
Miklos Szeredif9a28422006-06-25 05:48:53 -0700501 if (req->aborted)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700502 err = -ENOENT;
503 else
504 req->locked = 1;
Miklos Szeredid7133112006-04-10 22:54:55 -0700505 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700506 }
507 return err;
508}
509
510/*
Miklos Szeredif9a28422006-06-25 05:48:53 -0700511 * Unlock request. If it was aborted during being locked, the
Miklos Szeredi334f4852005-09-09 13:10:27 -0700512 * requester thread is currently waiting for it to be unlocked, so
513 * wake it up.
514 */
Miklos Szeredid7133112006-04-10 22:54:55 -0700515static void unlock_request(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700516{
517 if (req) {
Miklos Szeredid7133112006-04-10 22:54:55 -0700518 spin_lock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700519 req->locked = 0;
Miklos Szeredif9a28422006-06-25 05:48:53 -0700520 if (req->aborted)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700521 wake_up(&req->waitq);
Miklos Szeredid7133112006-04-10 22:54:55 -0700522 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700523 }
524}
525
526struct fuse_copy_state {
Miklos Szeredid7133112006-04-10 22:54:55 -0700527 struct fuse_conn *fc;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700528 int write;
529 struct fuse_req *req;
530 const struct iovec *iov;
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200531 struct pipe_buffer *pipebufs;
532 struct pipe_buffer *currbuf;
533 struct pipe_inode_info *pipe;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700534 unsigned long nr_segs;
535 unsigned long seglen;
536 unsigned long addr;
537 struct page *pg;
538 void *mapaddr;
539 void *buf;
540 unsigned len;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200541 unsigned move_pages:1;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700542};
543
Miklos Szeredid7133112006-04-10 22:54:55 -0700544static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc,
Miklos Szeredic3021622010-05-25 15:06:07 +0200545 int write,
Miklos Szeredid7133112006-04-10 22:54:55 -0700546 const struct iovec *iov, unsigned long nr_segs)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700547{
548 memset(cs, 0, sizeof(*cs));
Miklos Szeredid7133112006-04-10 22:54:55 -0700549 cs->fc = fc;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700550 cs->write = write;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700551 cs->iov = iov;
552 cs->nr_segs = nr_segs;
553}
554
555/* Unmap and put previous page of userspace buffer */
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800556static void fuse_copy_finish(struct fuse_copy_state *cs)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700557{
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200558 if (cs->currbuf) {
559 struct pipe_buffer *buf = cs->currbuf;
560
Miklos Szeredic3021622010-05-25 15:06:07 +0200561 if (!cs->write) {
562 buf->ops->unmap(cs->pipe, buf, cs->mapaddr);
563 } else {
Miklos Szeredi7909b1c2010-07-12 14:41:40 +0200564 kunmap(buf->page);
Miklos Szeredic3021622010-05-25 15:06:07 +0200565 buf->len = PAGE_SIZE - cs->len;
566 }
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200567 cs->currbuf = NULL;
568 cs->mapaddr = NULL;
569 } else if (cs->mapaddr) {
Miklos Szeredi7909b1c2010-07-12 14:41:40 +0200570 kunmap(cs->pg);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700571 if (cs->write) {
572 flush_dcache_page(cs->pg);
573 set_page_dirty_lock(cs->pg);
574 }
575 put_page(cs->pg);
576 cs->mapaddr = NULL;
577 }
578}
579
580/*
581 * Get another pagefull of userspace buffer, and map it to kernel
582 * address space, and lock request
583 */
584static int fuse_copy_fill(struct fuse_copy_state *cs)
585{
586 unsigned long offset;
587 int err;
588
Miklos Szeredid7133112006-04-10 22:54:55 -0700589 unlock_request(cs->fc, cs->req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700590 fuse_copy_finish(cs);
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200591 if (cs->pipebufs) {
592 struct pipe_buffer *buf = cs->pipebufs;
593
Miklos Szeredic3021622010-05-25 15:06:07 +0200594 if (!cs->write) {
595 err = buf->ops->confirm(cs->pipe, buf);
596 if (err)
597 return err;
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200598
Miklos Szeredic3021622010-05-25 15:06:07 +0200599 BUG_ON(!cs->nr_segs);
600 cs->currbuf = buf;
Miklos Szeredi7909b1c2010-07-12 14:41:40 +0200601 cs->mapaddr = buf->ops->map(cs->pipe, buf, 0);
Miklos Szeredic3021622010-05-25 15:06:07 +0200602 cs->len = buf->len;
603 cs->buf = cs->mapaddr + buf->offset;
604 cs->pipebufs++;
605 cs->nr_segs--;
606 } else {
607 struct page *page;
608
609 if (cs->nr_segs == cs->pipe->buffers)
610 return -EIO;
611
612 page = alloc_page(GFP_HIGHUSER);
613 if (!page)
614 return -ENOMEM;
615
616 buf->page = page;
617 buf->offset = 0;
618 buf->len = 0;
619
620 cs->currbuf = buf;
Miklos Szeredi7909b1c2010-07-12 14:41:40 +0200621 cs->mapaddr = kmap(page);
Miklos Szeredic3021622010-05-25 15:06:07 +0200622 cs->buf = cs->mapaddr;
623 cs->len = PAGE_SIZE;
624 cs->pipebufs++;
625 cs->nr_segs++;
626 }
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200627 } else {
628 if (!cs->seglen) {
629 BUG_ON(!cs->nr_segs);
630 cs->seglen = cs->iov[0].iov_len;
631 cs->addr = (unsigned long) cs->iov[0].iov_base;
632 cs->iov++;
633 cs->nr_segs--;
634 }
635 err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg);
636 if (err < 0)
637 return err;
638 BUG_ON(err != 1);
639 offset = cs->addr % PAGE_SIZE;
Miklos Szeredi7909b1c2010-07-12 14:41:40 +0200640 cs->mapaddr = kmap(cs->pg);
Miklos Szeredidd3bb142010-05-25 15:06:06 +0200641 cs->buf = cs->mapaddr + offset;
642 cs->len = min(PAGE_SIZE - offset, cs->seglen);
643 cs->seglen -= cs->len;
644 cs->addr += cs->len;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700645 }
Miklos Szeredi334f4852005-09-09 13:10:27 -0700646
Miklos Szeredid7133112006-04-10 22:54:55 -0700647 return lock_request(cs->fc, cs->req);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700648}
649
650/* Do as much copy to/from userspace buffer as we can */
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800651static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700652{
653 unsigned ncpy = min(*size, cs->len);
654 if (val) {
655 if (cs->write)
656 memcpy(cs->buf, *val, ncpy);
657 else
658 memcpy(*val, cs->buf, ncpy);
659 *val += ncpy;
660 }
661 *size -= ncpy;
662 cs->len -= ncpy;
663 cs->buf += ncpy;
664 return ncpy;
665}
666
Miklos Szeredice534fb2010-05-25 15:06:07 +0200667static int fuse_check_page(struct page *page)
668{
669 if (page_mapcount(page) ||
670 page->mapping != NULL ||
671 page_count(page) != 1 ||
672 (page->flags & PAGE_FLAGS_CHECK_AT_PREP &
673 ~(1 << PG_locked |
674 1 << PG_referenced |
675 1 << PG_uptodate |
676 1 << PG_lru |
677 1 << PG_active |
678 1 << PG_reclaim))) {
679 printk(KERN_WARNING "fuse: trying to steal weird page\n");
680 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);
681 return 1;
682 }
683 return 0;
684}
685
686static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
687{
688 int err;
689 struct page *oldpage = *pagep;
690 struct page *newpage;
691 struct pipe_buffer *buf = cs->pipebufs;
692 struct address_space *mapping;
693 pgoff_t index;
694
695 unlock_request(cs->fc, cs->req);
696 fuse_copy_finish(cs);
697
698 err = buf->ops->confirm(cs->pipe, buf);
699 if (err)
700 return err;
701
702 BUG_ON(!cs->nr_segs);
703 cs->currbuf = buf;
704 cs->len = buf->len;
705 cs->pipebufs++;
706 cs->nr_segs--;
707
708 if (cs->len != PAGE_SIZE)
709 goto out_fallback;
710
711 if (buf->ops->steal(cs->pipe, buf) != 0)
712 goto out_fallback;
713
714 newpage = buf->page;
715
716 if (WARN_ON(!PageUptodate(newpage)))
717 return -EIO;
718
719 ClearPageMappedToDisk(newpage);
720
721 if (fuse_check_page(newpage) != 0)
722 goto out_fallback_unlock;
723
724 mapping = oldpage->mapping;
725 index = oldpage->index;
726
727 /*
728 * This is a new and locked page, it shouldn't be mapped or
729 * have any special flags on it
730 */
731 if (WARN_ON(page_mapped(oldpage)))
732 goto out_fallback_unlock;
733 if (WARN_ON(page_has_private(oldpage)))
734 goto out_fallback_unlock;
735 if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage)))
736 goto out_fallback_unlock;
737 if (WARN_ON(PageMlocked(oldpage)))
738 goto out_fallback_unlock;
739
Miklos Szeredief6a3c62011-03-22 16:30:52 -0700740 err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL);
Miklos Szeredice534fb2010-05-25 15:06:07 +0200741 if (err) {
Miklos Szeredief6a3c62011-03-22 16:30:52 -0700742 unlock_page(newpage);
743 return err;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200744 }
Miklos Szeredief6a3c62011-03-22 16:30:52 -0700745
Miklos Szeredice534fb2010-05-25 15:06:07 +0200746 page_cache_get(newpage);
747
748 if (!(buf->flags & PIPE_BUF_FLAG_LRU))
749 lru_cache_add_file(newpage);
750
751 err = 0;
752 spin_lock(&cs->fc->lock);
753 if (cs->req->aborted)
754 err = -ENOENT;
755 else
756 *pagep = newpage;
757 spin_unlock(&cs->fc->lock);
758
759 if (err) {
760 unlock_page(newpage);
761 page_cache_release(newpage);
762 return err;
763 }
764
765 unlock_page(oldpage);
766 page_cache_release(oldpage);
767 cs->len = 0;
768
769 return 0;
770
771out_fallback_unlock:
772 unlock_page(newpage);
773out_fallback:
774 cs->mapaddr = buf->ops->map(cs->pipe, buf, 1);
775 cs->buf = cs->mapaddr + buf->offset;
776
777 err = lock_request(cs->fc, cs->req);
778 if (err)
779 return err;
780
781 return 1;
782}
783
Miklos Szeredic3021622010-05-25 15:06:07 +0200784static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page,
785 unsigned offset, unsigned count)
786{
787 struct pipe_buffer *buf;
788
789 if (cs->nr_segs == cs->pipe->buffers)
790 return -EIO;
791
792 unlock_request(cs->fc, cs->req);
793 fuse_copy_finish(cs);
794
795 buf = cs->pipebufs;
796 page_cache_get(page);
797 buf->page = page;
798 buf->offset = offset;
799 buf->len = count;
800
801 cs->pipebufs++;
802 cs->nr_segs++;
803 cs->len = 0;
804
805 return 0;
806}
807
Miklos Szeredi334f4852005-09-09 13:10:27 -0700808/*
809 * Copy a page in the request to/from the userspace buffer. Must be
810 * done atomically
811 */
Miklos Szeredice534fb2010-05-25 15:06:07 +0200812static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep,
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800813 unsigned offset, unsigned count, int zeroing)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700814{
Miklos Szeredice534fb2010-05-25 15:06:07 +0200815 int err;
816 struct page *page = *pagep;
817
Miklos Szeredib6777c42010-10-26 14:22:27 -0700818 if (page && zeroing && count < PAGE_SIZE)
819 clear_highpage(page);
820
Miklos Szeredi334f4852005-09-09 13:10:27 -0700821 while (count) {
Miklos Szeredic3021622010-05-25 15:06:07 +0200822 if (cs->write && cs->pipebufs && page) {
823 return fuse_ref_page(cs, page, offset, count);
824 } else if (!cs->len) {
Miklos Szeredice534fb2010-05-25 15:06:07 +0200825 if (cs->move_pages && page &&
826 offset == 0 && count == PAGE_SIZE) {
827 err = fuse_try_move_page(cs, pagep);
828 if (err <= 0)
829 return err;
830 } else {
831 err = fuse_copy_fill(cs);
832 if (err)
833 return err;
834 }
Miklos Szeredi1729a162008-11-26 12:03:54 +0100835 }
Miklos Szeredi334f4852005-09-09 13:10:27 -0700836 if (page) {
Miklos Szeredib6777c42010-10-26 14:22:27 -0700837 void *mapaddr = kmap_atomic(page, KM_USER0);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700838 void *buf = mapaddr + offset;
839 offset += fuse_copy_do(cs, &buf, &count);
Miklos Szeredib6777c42010-10-26 14:22:27 -0700840 kunmap_atomic(mapaddr, KM_USER0);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700841 } else
842 offset += fuse_copy_do(cs, NULL, &count);
843 }
844 if (page && !cs->write)
845 flush_dcache_page(page);
846 return 0;
847}
848
849/* Copy pages in the request to/from userspace buffer */
850static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
851 int zeroing)
852{
853 unsigned i;
854 struct fuse_req *req = cs->req;
855 unsigned offset = req->page_offset;
856 unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset);
857
858 for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) {
Miklos Szeredice534fb2010-05-25 15:06:07 +0200859 int err;
860
861 err = fuse_copy_page(cs, &req->pages[i], offset, count,
862 zeroing);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700863 if (err)
864 return err;
865
866 nbytes -= count;
867 count = min(nbytes, (unsigned) PAGE_SIZE);
868 offset = 0;
869 }
870 return 0;
871}
872
873/* Copy a single argument in the request to/from userspace buffer */
874static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size)
875{
876 while (size) {
Miklos Szeredi1729a162008-11-26 12:03:54 +0100877 if (!cs->len) {
878 int err = fuse_copy_fill(cs);
879 if (err)
880 return err;
881 }
Miklos Szeredi334f4852005-09-09 13:10:27 -0700882 fuse_copy_do(cs, &val, &size);
883 }
884 return 0;
885}
886
887/* Copy request arguments to/from userspace buffer */
888static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs,
889 unsigned argpages, struct fuse_arg *args,
890 int zeroing)
891{
892 int err = 0;
893 unsigned i;
894
895 for (i = 0; !err && i < numargs; i++) {
896 struct fuse_arg *arg = &args[i];
897 if (i == numargs - 1 && argpages)
898 err = fuse_copy_pages(cs, arg->size, zeroing);
899 else
900 err = fuse_copy_one(cs, arg->value, arg->size);
901 }
902 return err;
903}
904
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100905static int forget_pending(struct fuse_conn *fc)
906{
907 return fc->forget_list_head.next != NULL;
908}
909
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700910static int request_pending(struct fuse_conn *fc)
911{
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100912 return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) ||
913 forget_pending(fc);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700914}
915
Miklos Szeredi334f4852005-09-09 13:10:27 -0700916/* Wait until a request is available on the pending list */
917static void request_wait(struct fuse_conn *fc)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +0200918__releases(fc->lock)
919__acquires(fc->lock)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700920{
921 DECLARE_WAITQUEUE(wait, current);
922
923 add_wait_queue_exclusive(&fc->waitq, &wait);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700924 while (fc->connected && !request_pending(fc)) {
Miklos Szeredi334f4852005-09-09 13:10:27 -0700925 set_current_state(TASK_INTERRUPTIBLE);
926 if (signal_pending(current))
927 break;
928
Miklos Szeredid7133112006-04-10 22:54:55 -0700929 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700930 schedule();
Miklos Szeredid7133112006-04-10 22:54:55 -0700931 spin_lock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700932 }
933 set_current_state(TASK_RUNNING);
934 remove_wait_queue(&fc->waitq, &wait);
935}
936
937/*
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700938 * Transfer an interrupt request to userspace
939 *
940 * Unlike other requests this is assembled on demand, without a need
941 * to allocate a separate fuse_req structure.
942 *
943 * Called with fc->lock held, releases it
944 */
Miklos Szeredic3021622010-05-25 15:06:07 +0200945static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs,
946 size_t nbytes, struct fuse_req *req)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +0200947__releases(fc->lock)
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700948{
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700949 struct fuse_in_header ih;
950 struct fuse_interrupt_in arg;
951 unsigned reqsize = sizeof(ih) + sizeof(arg);
952 int err;
953
954 list_del_init(&req->intr_entry);
955 req->intr_unique = fuse_get_unique(fc);
956 memset(&ih, 0, sizeof(ih));
957 memset(&arg, 0, sizeof(arg));
958 ih.len = reqsize;
959 ih.opcode = FUSE_INTERRUPT;
960 ih.unique = req->intr_unique;
961 arg.unique = req->in.h.unique;
962
963 spin_unlock(&fc->lock);
Miklos Szeredic3021622010-05-25 15:06:07 +0200964 if (nbytes < reqsize)
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700965 return -EINVAL;
966
Miklos Szeredic3021622010-05-25 15:06:07 +0200967 err = fuse_copy_one(cs, &ih, sizeof(ih));
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700968 if (!err)
Miklos Szeredic3021622010-05-25 15:06:07 +0200969 err = fuse_copy_one(cs, &arg, sizeof(arg));
970 fuse_copy_finish(cs);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700971
972 return err ? err : reqsize;
973}
974
Miklos Szeredi02c048b2010-12-07 20:16:56 +0100975static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc,
976 unsigned max,
977 unsigned *countp)
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100978{
Miklos Szeredi02c048b2010-12-07 20:16:56 +0100979 struct fuse_forget_link *head = fc->forget_list_head.next;
980 struct fuse_forget_link **newhead = &head;
981 unsigned count;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100982
Miklos Szeredi02c048b2010-12-07 20:16:56 +0100983 for (count = 0; *newhead != NULL && count < max; count++)
984 newhead = &(*newhead)->next;
985
986 fc->forget_list_head.next = *newhead;
987 *newhead = NULL;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100988 if (fc->forget_list_head.next == NULL)
989 fc->forget_list_tail = &fc->forget_list_head;
990
Miklos Szeredi02c048b2010-12-07 20:16:56 +0100991 if (countp != NULL)
992 *countp = count;
993
994 return head;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100995}
996
997static int fuse_read_single_forget(struct fuse_conn *fc,
998 struct fuse_copy_state *cs,
999 size_t nbytes)
1000__releases(fc->lock)
1001{
1002 int err;
Miklos Szeredi02c048b2010-12-07 20:16:56 +01001003 struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001004 struct fuse_forget_in arg = {
Miklos Szeredi02c048b2010-12-07 20:16:56 +01001005 .nlookup = forget->forget_one.nlookup,
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001006 };
1007 struct fuse_in_header ih = {
1008 .opcode = FUSE_FORGET,
Miklos Szeredi02c048b2010-12-07 20:16:56 +01001009 .nodeid = forget->forget_one.nodeid,
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001010 .unique = fuse_get_unique(fc),
1011 .len = sizeof(ih) + sizeof(arg),
1012 };
1013
1014 spin_unlock(&fc->lock);
1015 kfree(forget);
1016 if (nbytes < ih.len)
1017 return -EINVAL;
1018
1019 err = fuse_copy_one(cs, &ih, sizeof(ih));
1020 if (!err)
1021 err = fuse_copy_one(cs, &arg, sizeof(arg));
1022 fuse_copy_finish(cs);
1023
1024 if (err)
1025 return err;
1026
1027 return ih.len;
1028}
1029
Miklos Szeredi02c048b2010-12-07 20:16:56 +01001030static int fuse_read_batch_forget(struct fuse_conn *fc,
1031 struct fuse_copy_state *cs, size_t nbytes)
1032__releases(fc->lock)
1033{
1034 int err;
1035 unsigned max_forgets;
1036 unsigned count;
1037 struct fuse_forget_link *head;
1038 struct fuse_batch_forget_in arg = { .count = 0 };
1039 struct fuse_in_header ih = {
1040 .opcode = FUSE_BATCH_FORGET,
1041 .unique = fuse_get_unique(fc),
1042 .len = sizeof(ih) + sizeof(arg),
1043 };
1044
1045 if (nbytes < ih.len) {
1046 spin_unlock(&fc->lock);
1047 return -EINVAL;
1048 }
1049
1050 max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one);
1051 head = dequeue_forget(fc, max_forgets, &count);
1052 spin_unlock(&fc->lock);
1053
1054 arg.count = count;
1055 ih.len += count * sizeof(struct fuse_forget_one);
1056 err = fuse_copy_one(cs, &ih, sizeof(ih));
1057 if (!err)
1058 err = fuse_copy_one(cs, &arg, sizeof(arg));
1059
1060 while (head) {
1061 struct fuse_forget_link *forget = head;
1062
1063 if (!err) {
1064 err = fuse_copy_one(cs, &forget->forget_one,
1065 sizeof(forget->forget_one));
1066 }
1067 head = forget->next;
1068 kfree(forget);
1069 }
1070
1071 fuse_copy_finish(cs);
1072
1073 if (err)
1074 return err;
1075
1076 return ih.len;
1077}
1078
1079static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs,
1080 size_t nbytes)
1081__releases(fc->lock)
1082{
1083 if (fc->minor < 16 || fc->forget_list_head.next->next == NULL)
1084 return fuse_read_single_forget(fc, cs, nbytes);
1085 else
1086 return fuse_read_batch_forget(fc, cs, nbytes);
1087}
1088
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001089/*
Miklos Szeredi334f4852005-09-09 13:10:27 -07001090 * Read a single request into the userspace filesystem's buffer. This
1091 * function waits until a request is available, then removes it from
1092 * the pending list and copies request data to userspace buffer. If
Miklos Szeredif9a28422006-06-25 05:48:53 -07001093 * no reply is needed (FORGET) or request has been aborted or there
1094 * was an error during the copying then it's finished by calling
Miklos Szeredi334f4852005-09-09 13:10:27 -07001095 * request_end(). Otherwise add it to the processing list, and set
1096 * the 'sent' flag.
1097 */
Miklos Szeredic3021622010-05-25 15:06:07 +02001098static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
1099 struct fuse_copy_state *cs, size_t nbytes)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001100{
1101 int err;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001102 struct fuse_req *req;
1103 struct fuse_in *in;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001104 unsigned reqsize;
1105
Miklos Szeredi1d3d7522006-01-06 00:19:40 -08001106 restart:
Miklos Szeredid7133112006-04-10 22:54:55 -07001107 spin_lock(&fc->lock);
Jeff Dikee5ac1d12006-04-10 22:54:53 -07001108 err = -EAGAIN;
1109 if ((file->f_flags & O_NONBLOCK) && fc->connected &&
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001110 !request_pending(fc))
Jeff Dikee5ac1d12006-04-10 22:54:53 -07001111 goto err_unlock;
1112
Miklos Szeredi334f4852005-09-09 13:10:27 -07001113 request_wait(fc);
1114 err = -ENODEV;
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -08001115 if (!fc->connected)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001116 goto err_unlock;
1117 err = -ERESTARTSYS;
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001118 if (!request_pending(fc))
Miklos Szeredi334f4852005-09-09 13:10:27 -07001119 goto err_unlock;
1120
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001121 if (!list_empty(&fc->interrupts)) {
1122 req = list_entry(fc->interrupts.next, struct fuse_req,
1123 intr_entry);
Miklos Szeredic3021622010-05-25 15:06:07 +02001124 return fuse_read_interrupt(fc, cs, nbytes, req);
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001125 }
1126
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001127 if (forget_pending(fc)) {
1128 if (list_empty(&fc->pending) || fc->forget_batch-- > 0)
Miklos Szeredi02c048b2010-12-07 20:16:56 +01001129 return fuse_read_forget(fc, cs, nbytes);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001130
1131 if (fc->forget_batch <= -8)
1132 fc->forget_batch = 16;
1133 }
1134
Miklos Szeredi334f4852005-09-09 13:10:27 -07001135 req = list_entry(fc->pending.next, struct fuse_req, list);
Miklos Szeredi83cfd492006-01-16 22:14:31 -08001136 req->state = FUSE_REQ_READING;
Miklos Szeredid77a1d52006-01-16 22:14:31 -08001137 list_move(&req->list, &fc->io);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001138
1139 in = &req->in;
Miklos Szeredi1d3d7522006-01-06 00:19:40 -08001140 reqsize = in->h.len;
1141 /* If request is too large, reply with an error and restart the read */
Miklos Szeredic3021622010-05-25 15:06:07 +02001142 if (nbytes < reqsize) {
Miklos Szeredi1d3d7522006-01-06 00:19:40 -08001143 req->out.h.error = -EIO;
1144 /* SETXATTR is special, since it may contain too large data */
1145 if (in->h.opcode == FUSE_SETXATTR)
1146 req->out.h.error = -E2BIG;
1147 request_end(fc, req);
1148 goto restart;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001149 }
Miklos Szeredid7133112006-04-10 22:54:55 -07001150 spin_unlock(&fc->lock);
Miklos Szeredic3021622010-05-25 15:06:07 +02001151 cs->req = req;
1152 err = fuse_copy_one(cs, &in->h, sizeof(in->h));
Miklos Szeredi1d3d7522006-01-06 00:19:40 -08001153 if (!err)
Miklos Szeredic3021622010-05-25 15:06:07 +02001154 err = fuse_copy_args(cs, in->numargs, in->argpages,
Miklos Szeredi1d3d7522006-01-06 00:19:40 -08001155 (struct fuse_arg *) in->args, 0);
Miklos Szeredic3021622010-05-25 15:06:07 +02001156 fuse_copy_finish(cs);
Miklos Szeredid7133112006-04-10 22:54:55 -07001157 spin_lock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001158 req->locked = 0;
Miklos Szeredic9c9d7d2007-10-16 23:31:05 -07001159 if (req->aborted) {
1160 request_end(fc, req);
1161 return -ENODEV;
1162 }
Miklos Szeredi334f4852005-09-09 13:10:27 -07001163 if (err) {
Miklos Szeredic9c9d7d2007-10-16 23:31:05 -07001164 req->out.h.error = -EIO;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001165 request_end(fc, req);
1166 return err;
1167 }
1168 if (!req->isreply)
1169 request_end(fc, req);
1170 else {
Miklos Szeredi83cfd492006-01-16 22:14:31 -08001171 req->state = FUSE_REQ_SENT;
Miklos Szeredid77a1d52006-01-16 22:14:31 -08001172 list_move_tail(&req->list, &fc->processing);
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001173 if (req->interrupted)
1174 queue_interrupt(fc, req);
Miklos Szeredid7133112006-04-10 22:54:55 -07001175 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001176 }
1177 return reqsize;
1178
1179 err_unlock:
Miklos Szeredid7133112006-04-10 22:54:55 -07001180 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001181 return err;
1182}
1183
Miklos Szeredic3021622010-05-25 15:06:07 +02001184static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
1185 unsigned long nr_segs, loff_t pos)
1186{
1187 struct fuse_copy_state cs;
1188 struct file *file = iocb->ki_filp;
1189 struct fuse_conn *fc = fuse_get_conn(file);
1190 if (!fc)
1191 return -EPERM;
1192
1193 fuse_copy_init(&cs, fc, 1, iov, nr_segs);
1194
1195 return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs));
1196}
1197
1198static int fuse_dev_pipe_buf_steal(struct pipe_inode_info *pipe,
1199 struct pipe_buffer *buf)
1200{
1201 return 1;
1202}
1203
1204static const struct pipe_buf_operations fuse_dev_pipe_buf_ops = {
1205 .can_merge = 0,
1206 .map = generic_pipe_buf_map,
1207 .unmap = generic_pipe_buf_unmap,
1208 .confirm = generic_pipe_buf_confirm,
1209 .release = generic_pipe_buf_release,
1210 .steal = fuse_dev_pipe_buf_steal,
1211 .get = generic_pipe_buf_get,
1212};
1213
1214static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
1215 struct pipe_inode_info *pipe,
1216 size_t len, unsigned int flags)
1217{
1218 int ret;
1219 int page_nr = 0;
1220 int do_wakeup = 0;
1221 struct pipe_buffer *bufs;
1222 struct fuse_copy_state cs;
1223 struct fuse_conn *fc = fuse_get_conn(in);
1224 if (!fc)
1225 return -EPERM;
1226
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001227 bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL);
Miklos Szeredic3021622010-05-25 15:06:07 +02001228 if (!bufs)
1229 return -ENOMEM;
1230
1231 fuse_copy_init(&cs, fc, 1, NULL, 0);
1232 cs.pipebufs = bufs;
1233 cs.pipe = pipe;
1234 ret = fuse_dev_do_read(fc, in, &cs, len);
1235 if (ret < 0)
1236 goto out;
1237
1238 ret = 0;
1239 pipe_lock(pipe);
1240
1241 if (!pipe->readers) {
1242 send_sig(SIGPIPE, current, 0);
1243 if (!ret)
1244 ret = -EPIPE;
1245 goto out_unlock;
1246 }
1247
1248 if (pipe->nrbufs + cs.nr_segs > pipe->buffers) {
1249 ret = -EIO;
1250 goto out_unlock;
1251 }
1252
1253 while (page_nr < cs.nr_segs) {
1254 int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1);
1255 struct pipe_buffer *buf = pipe->bufs + newbuf;
1256
1257 buf->page = bufs[page_nr].page;
1258 buf->offset = bufs[page_nr].offset;
1259 buf->len = bufs[page_nr].len;
1260 buf->ops = &fuse_dev_pipe_buf_ops;
1261
1262 pipe->nrbufs++;
1263 page_nr++;
1264 ret += buf->len;
1265
1266 if (pipe->inode)
1267 do_wakeup = 1;
1268 }
1269
1270out_unlock:
1271 pipe_unlock(pipe);
1272
1273 if (do_wakeup) {
1274 smp_mb();
1275 if (waitqueue_active(&pipe->wait))
1276 wake_up_interruptible(&pipe->wait);
1277 kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
1278 }
1279
1280out:
1281 for (; page_nr < cs.nr_segs; page_nr++)
1282 page_cache_release(bufs[page_nr].page);
1283
1284 kfree(bufs);
1285 return ret;
1286}
1287
Tejun Heo95668a62008-11-26 12:03:55 +01001288static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size,
1289 struct fuse_copy_state *cs)
1290{
1291 struct fuse_notify_poll_wakeup_out outarg;
Miklos Szeredif6d47a12009-01-26 15:00:59 +01001292 int err = -EINVAL;
Tejun Heo95668a62008-11-26 12:03:55 +01001293
1294 if (size != sizeof(outarg))
Miklos Szeredif6d47a12009-01-26 15:00:59 +01001295 goto err;
Tejun Heo95668a62008-11-26 12:03:55 +01001296
1297 err = fuse_copy_one(cs, &outarg, sizeof(outarg));
1298 if (err)
Miklos Szeredif6d47a12009-01-26 15:00:59 +01001299 goto err;
Tejun Heo95668a62008-11-26 12:03:55 +01001300
Miklos Szeredif6d47a12009-01-26 15:00:59 +01001301 fuse_copy_finish(cs);
Tejun Heo95668a62008-11-26 12:03:55 +01001302 return fuse_notify_poll_wakeup(fc, &outarg);
Miklos Szeredif6d47a12009-01-26 15:00:59 +01001303
1304err:
1305 fuse_copy_finish(cs);
1306 return err;
Tejun Heo95668a62008-11-26 12:03:55 +01001307}
1308
John Muir3b463ae2009-05-31 11:13:57 -04001309static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size,
1310 struct fuse_copy_state *cs)
1311{
1312 struct fuse_notify_inval_inode_out outarg;
1313 int err = -EINVAL;
1314
1315 if (size != sizeof(outarg))
1316 goto err;
1317
1318 err = fuse_copy_one(cs, &outarg, sizeof(outarg));
1319 if (err)
1320 goto err;
1321 fuse_copy_finish(cs);
1322
1323 down_read(&fc->killsb);
1324 err = -ENOENT;
Miklos Szeredib21dda42010-02-05 12:08:31 +01001325 if (fc->sb) {
1326 err = fuse_reverse_inval_inode(fc->sb, outarg.ino,
1327 outarg.off, outarg.len);
1328 }
John Muir3b463ae2009-05-31 11:13:57 -04001329 up_read(&fc->killsb);
1330 return err;
1331
1332err:
1333 fuse_copy_finish(cs);
1334 return err;
1335}
1336
1337static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
1338 struct fuse_copy_state *cs)
1339{
1340 struct fuse_notify_inval_entry_out outarg;
Fang Wenqib2d82ee2009-12-30 18:37:13 +08001341 int err = -ENOMEM;
1342 char *buf;
John Muir3b463ae2009-05-31 11:13:57 -04001343 struct qstr name;
1344
Fang Wenqib2d82ee2009-12-30 18:37:13 +08001345 buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL);
1346 if (!buf)
1347 goto err;
1348
1349 err = -EINVAL;
John Muir3b463ae2009-05-31 11:13:57 -04001350 if (size < sizeof(outarg))
1351 goto err;
1352
1353 err = fuse_copy_one(cs, &outarg, sizeof(outarg));
1354 if (err)
1355 goto err;
1356
1357 err = -ENAMETOOLONG;
1358 if (outarg.namelen > FUSE_NAME_MAX)
1359 goto err;
1360
1361 name.name = buf;
1362 name.len = outarg.namelen;
1363 err = fuse_copy_one(cs, buf, outarg.namelen + 1);
1364 if (err)
1365 goto err;
1366 fuse_copy_finish(cs);
1367 buf[outarg.namelen] = 0;
1368 name.hash = full_name_hash(name.name, name.len);
1369
1370 down_read(&fc->killsb);
1371 err = -ENOENT;
Miklos Szeredib21dda42010-02-05 12:08:31 +01001372 if (fc->sb)
1373 err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name);
John Muir3b463ae2009-05-31 11:13:57 -04001374 up_read(&fc->killsb);
Fang Wenqib2d82ee2009-12-30 18:37:13 +08001375 kfree(buf);
John Muir3b463ae2009-05-31 11:13:57 -04001376 return err;
1377
1378err:
Fang Wenqib2d82ee2009-12-30 18:37:13 +08001379 kfree(buf);
John Muir3b463ae2009-05-31 11:13:57 -04001380 fuse_copy_finish(cs);
1381 return err;
1382}
1383
Miklos Szeredia1d75f22010-07-12 14:41:40 +02001384static int fuse_notify_store(struct fuse_conn *fc, unsigned int size,
1385 struct fuse_copy_state *cs)
1386{
1387 struct fuse_notify_store_out outarg;
1388 struct inode *inode;
1389 struct address_space *mapping;
1390 u64 nodeid;
1391 int err;
1392 pgoff_t index;
1393 unsigned int offset;
1394 unsigned int num;
1395 loff_t file_size;
1396 loff_t end;
1397
1398 err = -EINVAL;
1399 if (size < sizeof(outarg))
1400 goto out_finish;
1401
1402 err = fuse_copy_one(cs, &outarg, sizeof(outarg));
1403 if (err)
1404 goto out_finish;
1405
1406 err = -EINVAL;
1407 if (size - sizeof(outarg) != outarg.size)
1408 goto out_finish;
1409
1410 nodeid = outarg.nodeid;
1411
1412 down_read(&fc->killsb);
1413
1414 err = -ENOENT;
1415 if (!fc->sb)
1416 goto out_up_killsb;
1417
1418 inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid);
1419 if (!inode)
1420 goto out_up_killsb;
1421
1422 mapping = inode->i_mapping;
1423 index = outarg.offset >> PAGE_CACHE_SHIFT;
1424 offset = outarg.offset & ~PAGE_CACHE_MASK;
1425 file_size = i_size_read(inode);
1426 end = outarg.offset + outarg.size;
1427 if (end > file_size) {
1428 file_size = end;
1429 fuse_write_update_size(inode, file_size);
1430 }
1431
1432 num = outarg.size;
1433 while (num) {
1434 struct page *page;
1435 unsigned int this_num;
1436
1437 err = -ENOMEM;
1438 page = find_or_create_page(mapping, index,
1439 mapping_gfp_mask(mapping));
1440 if (!page)
1441 goto out_iput;
1442
1443 this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset);
1444 err = fuse_copy_page(cs, &page, offset, this_num, 0);
1445 if (!err && offset == 0 && (num != 0 || file_size == end))
1446 SetPageUptodate(page);
1447 unlock_page(page);
1448 page_cache_release(page);
1449
1450 if (err)
1451 goto out_iput;
1452
1453 num -= this_num;
1454 offset = 0;
1455 index++;
1456 }
1457
1458 err = 0;
1459
1460out_iput:
1461 iput(inode);
1462out_up_killsb:
1463 up_read(&fc->killsb);
1464out_finish:
1465 fuse_copy_finish(cs);
1466 return err;
1467}
1468
Miklos Szeredi2d45ba32010-07-12 14:41:40 +02001469static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req)
1470{
Miklos Szeredi0be85572010-10-27 15:34:46 -07001471 release_pages(req->pages, req->num_pages, 0);
Miklos Szeredi2d45ba32010-07-12 14:41:40 +02001472}
1473
1474static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
1475 struct fuse_notify_retrieve_out *outarg)
1476{
1477 int err;
1478 struct address_space *mapping = inode->i_mapping;
1479 struct fuse_req *req;
1480 pgoff_t index;
1481 loff_t file_size;
1482 unsigned int num;
1483 unsigned int offset;
Geert Uytterhoeven01574432010-09-30 22:06:21 +02001484 size_t total_len = 0;
Miklos Szeredi2d45ba32010-07-12 14:41:40 +02001485
1486 req = fuse_get_req(fc);
1487 if (IS_ERR(req))
1488 return PTR_ERR(req);
1489
1490 offset = outarg->offset & ~PAGE_CACHE_MASK;
1491
1492 req->in.h.opcode = FUSE_NOTIFY_REPLY;
1493 req->in.h.nodeid = outarg->nodeid;
1494 req->in.numargs = 2;
1495 req->in.argpages = 1;
1496 req->page_offset = offset;
1497 req->end = fuse_retrieve_end;
1498
1499 index = outarg->offset >> PAGE_CACHE_SHIFT;
1500 file_size = i_size_read(inode);
1501 num = outarg->size;
1502 if (outarg->offset > file_size)
1503 num = 0;
1504 else if (outarg->offset + num > file_size)
1505 num = file_size - outarg->offset;
1506
1507 while (num) {
1508 struct page *page;
1509 unsigned int this_num;
1510
1511 page = find_get_page(mapping, index);
1512 if (!page)
1513 break;
1514
1515 this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset);
1516 req->pages[req->num_pages] = page;
1517 req->num_pages++;
1518
1519 num -= this_num;
1520 total_len += this_num;
1521 }
1522 req->misc.retrieve_in.offset = outarg->offset;
1523 req->misc.retrieve_in.size = total_len;
1524 req->in.args[0].size = sizeof(req->misc.retrieve_in);
1525 req->in.args[0].value = &req->misc.retrieve_in;
1526 req->in.args[1].size = total_len;
1527
1528 err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique);
1529 if (err)
1530 fuse_retrieve_end(fc, req);
1531
1532 return err;
1533}
1534
1535static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size,
1536 struct fuse_copy_state *cs)
1537{
1538 struct fuse_notify_retrieve_out outarg;
1539 struct inode *inode;
1540 int err;
1541
1542 err = -EINVAL;
1543 if (size != sizeof(outarg))
1544 goto copy_finish;
1545
1546 err = fuse_copy_one(cs, &outarg, sizeof(outarg));
1547 if (err)
1548 goto copy_finish;
1549
1550 fuse_copy_finish(cs);
1551
1552 down_read(&fc->killsb);
1553 err = -ENOENT;
1554 if (fc->sb) {
1555 u64 nodeid = outarg.nodeid;
1556
1557 inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid);
1558 if (inode) {
1559 err = fuse_retrieve(fc, inode, &outarg);
1560 iput(inode);
1561 }
1562 }
1563 up_read(&fc->killsb);
1564
1565 return err;
1566
1567copy_finish:
1568 fuse_copy_finish(cs);
1569 return err;
1570}
1571
Tejun Heo85993962008-11-26 12:03:55 +01001572static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
1573 unsigned int size, struct fuse_copy_state *cs)
1574{
1575 switch (code) {
Tejun Heo95668a62008-11-26 12:03:55 +01001576 case FUSE_NOTIFY_POLL:
1577 return fuse_notify_poll(fc, size, cs);
1578
John Muir3b463ae2009-05-31 11:13:57 -04001579 case FUSE_NOTIFY_INVAL_INODE:
1580 return fuse_notify_inval_inode(fc, size, cs);
1581
1582 case FUSE_NOTIFY_INVAL_ENTRY:
1583 return fuse_notify_inval_entry(fc, size, cs);
1584
Miklos Szeredia1d75f22010-07-12 14:41:40 +02001585 case FUSE_NOTIFY_STORE:
1586 return fuse_notify_store(fc, size, cs);
1587
Miklos Szeredi2d45ba32010-07-12 14:41:40 +02001588 case FUSE_NOTIFY_RETRIEVE:
1589 return fuse_notify_retrieve(fc, size, cs);
1590
Tejun Heo85993962008-11-26 12:03:55 +01001591 default:
Miklos Szeredif6d47a12009-01-26 15:00:59 +01001592 fuse_copy_finish(cs);
Tejun Heo85993962008-11-26 12:03:55 +01001593 return -EINVAL;
1594 }
1595}
1596
Miklos Szeredi334f4852005-09-09 13:10:27 -07001597/* Look up request on processing list by unique ID */
1598static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique)
1599{
1600 struct list_head *entry;
1601
1602 list_for_each(entry, &fc->processing) {
1603 struct fuse_req *req;
1604 req = list_entry(entry, struct fuse_req, list);
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001605 if (req->in.h.unique == unique || req->intr_unique == unique)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001606 return req;
1607 }
1608 return NULL;
1609}
1610
1611static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
1612 unsigned nbytes)
1613{
1614 unsigned reqsize = sizeof(struct fuse_out_header);
1615
1616 if (out->h.error)
1617 return nbytes != reqsize ? -EINVAL : 0;
1618
1619 reqsize += len_args(out->numargs, out->args);
1620
1621 if (reqsize < nbytes || (reqsize > nbytes && !out->argvar))
1622 return -EINVAL;
1623 else if (reqsize > nbytes) {
1624 struct fuse_arg *lastarg = &out->args[out->numargs-1];
1625 unsigned diffsize = reqsize - nbytes;
1626 if (diffsize > lastarg->size)
1627 return -EINVAL;
1628 lastarg->size -= diffsize;
1629 }
1630 return fuse_copy_args(cs, out->numargs, out->argpages, out->args,
1631 out->page_zeroing);
1632}
1633
1634/*
1635 * Write a single reply to a request. First the header is copied from
1636 * the write buffer. The request is then searched on the processing
1637 * list by the unique ID found in the header. If found, then remove
1638 * it from the list and copy the rest of the buffer to the request.
1639 * The request is finished by calling request_end()
1640 */
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001641static ssize_t fuse_dev_do_write(struct fuse_conn *fc,
1642 struct fuse_copy_state *cs, size_t nbytes)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001643{
1644 int err;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001645 struct fuse_req *req;
1646 struct fuse_out_header oh;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001647
Miklos Szeredi334f4852005-09-09 13:10:27 -07001648 if (nbytes < sizeof(struct fuse_out_header))
1649 return -EINVAL;
1650
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001651 err = fuse_copy_one(cs, &oh, sizeof(oh));
Miklos Szeredi334f4852005-09-09 13:10:27 -07001652 if (err)
1653 goto err_finish;
Tejun Heo85993962008-11-26 12:03:55 +01001654
Miklos Szeredi334f4852005-09-09 13:10:27 -07001655 err = -EINVAL;
Tejun Heo85993962008-11-26 12:03:55 +01001656 if (oh.len != nbytes)
1657 goto err_finish;
1658
1659 /*
1660 * Zero oh.unique indicates unsolicited notification message
1661 * and error contains notification code.
1662 */
1663 if (!oh.unique) {
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001664 err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs);
Tejun Heo85993962008-11-26 12:03:55 +01001665 return err ? err : nbytes;
1666 }
1667
1668 err = -EINVAL;
1669 if (oh.error <= -1000 || oh.error > 0)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001670 goto err_finish;
1671
Miklos Szeredid7133112006-04-10 22:54:55 -07001672 spin_lock(&fc->lock);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001673 err = -ENOENT;
1674 if (!fc->connected)
1675 goto err_unlock;
1676
Miklos Szeredi334f4852005-09-09 13:10:27 -07001677 req = request_find(fc, oh.unique);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001678 if (!req)
1679 goto err_unlock;
1680
Miklos Szeredif9a28422006-06-25 05:48:53 -07001681 if (req->aborted) {
Miklos Szeredid7133112006-04-10 22:54:55 -07001682 spin_unlock(&fc->lock);
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001683 fuse_copy_finish(cs);
Miklos Szeredid7133112006-04-10 22:54:55 -07001684 spin_lock(&fc->lock);
Miklos Szeredi222f1d692006-01-16 22:14:25 -08001685 request_end(fc, req);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001686 return -ENOENT;
1687 }
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001688 /* Is it an interrupt reply? */
1689 if (req->intr_unique == oh.unique) {
1690 err = -EINVAL;
1691 if (nbytes != sizeof(struct fuse_out_header))
1692 goto err_unlock;
1693
1694 if (oh.error == -ENOSYS)
1695 fc->no_interrupt = 1;
1696 else if (oh.error == -EAGAIN)
1697 queue_interrupt(fc, req);
1698
1699 spin_unlock(&fc->lock);
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001700 fuse_copy_finish(cs);
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001701 return nbytes;
1702 }
1703
1704 req->state = FUSE_REQ_WRITING;
Miklos Szeredid77a1d52006-01-16 22:14:31 -08001705 list_move(&req->list, &fc->io);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001706 req->out.h = oh;
1707 req->locked = 1;
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001708 cs->req = req;
Miklos Szeredice534fb2010-05-25 15:06:07 +02001709 if (!req->out.page_replace)
1710 cs->move_pages = 0;
Miklos Szeredid7133112006-04-10 22:54:55 -07001711 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001712
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001713 err = copy_out_args(cs, &req->out, nbytes);
1714 fuse_copy_finish(cs);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001715
Miklos Szeredid7133112006-04-10 22:54:55 -07001716 spin_lock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001717 req->locked = 0;
1718 if (!err) {
Miklos Szeredif9a28422006-06-25 05:48:53 -07001719 if (req->aborted)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001720 err = -ENOENT;
Miklos Szeredif9a28422006-06-25 05:48:53 -07001721 } else if (!req->aborted)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001722 req->out.h.error = -EIO;
1723 request_end(fc, req);
1724
1725 return err ? err : nbytes;
1726
1727 err_unlock:
Miklos Szeredid7133112006-04-10 22:54:55 -07001728 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001729 err_finish:
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001730 fuse_copy_finish(cs);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001731 return err;
1732}
1733
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001734static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
1735 unsigned long nr_segs, loff_t pos)
1736{
1737 struct fuse_copy_state cs;
1738 struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp);
1739 if (!fc)
1740 return -EPERM;
1741
Miklos Szeredic3021622010-05-25 15:06:07 +02001742 fuse_copy_init(&cs, fc, 0, iov, nr_segs);
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001743
1744 return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs));
1745}
1746
1747static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
1748 struct file *out, loff_t *ppos,
1749 size_t len, unsigned int flags)
1750{
1751 unsigned nbuf;
1752 unsigned idx;
1753 struct pipe_buffer *bufs;
1754 struct fuse_copy_state cs;
1755 struct fuse_conn *fc;
1756 size_t rem;
1757 ssize_t ret;
1758
1759 fc = fuse_get_conn(out);
1760 if (!fc)
1761 return -EPERM;
1762
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001763 bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL);
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001764 if (!bufs)
1765 return -ENOMEM;
1766
1767 pipe_lock(pipe);
1768 nbuf = 0;
1769 rem = 0;
1770 for (idx = 0; idx < pipe->nrbufs && rem < len; idx++)
1771 rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len;
1772
1773 ret = -EINVAL;
1774 if (rem < len) {
1775 pipe_unlock(pipe);
1776 goto out;
1777 }
1778
1779 rem = len;
1780 while (rem) {
1781 struct pipe_buffer *ibuf;
1782 struct pipe_buffer *obuf;
1783
1784 BUG_ON(nbuf >= pipe->buffers);
1785 BUG_ON(!pipe->nrbufs);
1786 ibuf = &pipe->bufs[pipe->curbuf];
1787 obuf = &bufs[nbuf];
1788
1789 if (rem >= ibuf->len) {
1790 *obuf = *ibuf;
1791 ibuf->ops = NULL;
1792 pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);
1793 pipe->nrbufs--;
1794 } else {
1795 ibuf->ops->get(pipe, ibuf);
1796 *obuf = *ibuf;
1797 obuf->flags &= ~PIPE_BUF_FLAG_GIFT;
1798 obuf->len = rem;
1799 ibuf->offset += obuf->len;
1800 ibuf->len -= obuf->len;
1801 }
1802 nbuf++;
1803 rem -= obuf->len;
1804 }
1805 pipe_unlock(pipe);
1806
Miklos Szeredic3021622010-05-25 15:06:07 +02001807 fuse_copy_init(&cs, fc, 0, NULL, nbuf);
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001808 cs.pipebufs = bufs;
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001809 cs.pipe = pipe;
1810
Miklos Szeredice534fb2010-05-25 15:06:07 +02001811 if (flags & SPLICE_F_MOVE)
1812 cs.move_pages = 1;
1813
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001814 ret = fuse_dev_do_write(fc, &cs, len);
1815
1816 for (idx = 0; idx < nbuf; idx++) {
1817 struct pipe_buffer *buf = &bufs[idx];
1818 buf->ops->release(pipe, buf);
1819 }
1820out:
1821 kfree(bufs);
1822 return ret;
1823}
1824
Miklos Szeredi334f4852005-09-09 13:10:27 -07001825static unsigned fuse_dev_poll(struct file *file, poll_table *wait)
1826{
Miklos Szeredi334f4852005-09-09 13:10:27 -07001827 unsigned mask = POLLOUT | POLLWRNORM;
Miklos Szeredi7025d9a2006-04-10 22:54:50 -07001828 struct fuse_conn *fc = fuse_get_conn(file);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001829 if (!fc)
Miklos Szeredi7025d9a2006-04-10 22:54:50 -07001830 return POLLERR;
Miklos Szeredi334f4852005-09-09 13:10:27 -07001831
1832 poll_wait(file, &fc->waitq, wait);
1833
Miklos Szeredid7133112006-04-10 22:54:55 -07001834 spin_lock(&fc->lock);
Miklos Szeredi7025d9a2006-04-10 22:54:50 -07001835 if (!fc->connected)
1836 mask = POLLERR;
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001837 else if (request_pending(fc))
Miklos Szeredi7025d9a2006-04-10 22:54:50 -07001838 mask |= POLLIN | POLLRDNORM;
Miklos Szeredid7133112006-04-10 22:54:55 -07001839 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001840
1841 return mask;
1842}
1843
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001844/*
1845 * Abort all requests on the given list (pending or processing)
1846 *
Miklos Szeredid7133112006-04-10 22:54:55 -07001847 * This function releases and reacquires fc->lock
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001848 */
Miklos Szeredi334f4852005-09-09 13:10:27 -07001849static void end_requests(struct fuse_conn *fc, struct list_head *head)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001850__releases(fc->lock)
1851__acquires(fc->lock)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001852{
1853 while (!list_empty(head)) {
1854 struct fuse_req *req;
1855 req = list_entry(head->next, struct fuse_req, list);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001856 req->out.h.error = -ECONNABORTED;
1857 request_end(fc, req);
Miklos Szeredid7133112006-04-10 22:54:55 -07001858 spin_lock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001859 }
1860}
1861
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001862/*
1863 * Abort requests under I/O
1864 *
Miklos Szeredif9a28422006-06-25 05:48:53 -07001865 * The requests are set to aborted and finished, and the request
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001866 * waiter is woken up. This will make request_wait_answer() wait
1867 * until the request is unlocked and then return.
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -08001868 *
1869 * If the request is asynchronous, then the end function needs to be
1870 * called after waiting for the request to be unlocked (if it was
1871 * locked).
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001872 */
1873static void end_io_requests(struct fuse_conn *fc)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001874__releases(fc->lock)
1875__acquires(fc->lock)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001876{
1877 while (!list_empty(&fc->io)) {
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -08001878 struct fuse_req *req =
1879 list_entry(fc->io.next, struct fuse_req, list);
1880 void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
1881
Miklos Szeredif9a28422006-06-25 05:48:53 -07001882 req->aborted = 1;
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001883 req->out.h.error = -ECONNABORTED;
1884 req->state = FUSE_REQ_FINISHED;
1885 list_del_init(&req->list);
1886 wake_up(&req->waitq);
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -08001887 if (end) {
1888 req->end = NULL;
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -08001889 __fuse_get_request(req);
Miklos Szeredid7133112006-04-10 22:54:55 -07001890 spin_unlock(&fc->lock);
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -08001891 wait_event(req->waitq, !req->locked);
1892 end(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +01001893 fuse_put_request(fc, req);
Miklos Szeredid7133112006-04-10 22:54:55 -07001894 spin_lock(&fc->lock);
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -08001895 }
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001896 }
1897}
1898
Miklos Szeredi595afaf2010-09-07 13:42:41 +02001899static void end_queued_requests(struct fuse_conn *fc)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001900__releases(fc->lock)
1901__acquires(fc->lock)
Miklos Szeredi595afaf2010-09-07 13:42:41 +02001902{
1903 fc->max_background = UINT_MAX;
1904 flush_bg_queue(fc);
1905 end_requests(fc, &fc->pending);
1906 end_requests(fc, &fc->processing);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +01001907 while (forget_pending(fc))
Miklos Szeredi02c048b2010-12-07 20:16:56 +01001908 kfree(dequeue_forget(fc, 1, NULL));
Miklos Szeredi595afaf2010-09-07 13:42:41 +02001909}
1910
Bryan Green357ccf22011-03-01 16:43:52 -08001911static void end_polls(struct fuse_conn *fc)
1912{
1913 struct rb_node *p;
1914
1915 p = rb_first(&fc->polled_files);
1916
1917 while (p) {
1918 struct fuse_file *ff;
1919 ff = rb_entry(p, struct fuse_file, polled_node);
1920 wake_up_interruptible_all(&ff->poll_wait);
1921
1922 p = rb_next(p);
1923 }
1924}
1925
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001926/*
1927 * Abort all requests.
1928 *
1929 * Emergency exit in case of a malicious or accidental deadlock, or
1930 * just a hung filesystem.
1931 *
1932 * The same effect is usually achievable through killing the
1933 * filesystem daemon and all users of the filesystem. The exception
1934 * is the combination of an asynchronous request and the tricky
1935 * deadlock (see Documentation/filesystems/fuse.txt).
1936 *
1937 * During the aborting, progression of requests from the pending and
1938 * processing lists onto the io list, and progression of new requests
1939 * onto the pending list is prevented by req->connected being false.
1940 *
1941 * Progression of requests under I/O to the processing list is
Miklos Szeredif9a28422006-06-25 05:48:53 -07001942 * prevented by the req->aborted flag being true for these requests.
1943 * For this reason requests on the io list must be aborted first.
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001944 */
1945void fuse_abort_conn(struct fuse_conn *fc)
1946{
Miklos Szeredid7133112006-04-10 22:54:55 -07001947 spin_lock(&fc->lock);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001948 if (fc->connected) {
1949 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -07001950 fc->blocked = 0;
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001951 end_io_requests(fc);
Miklos Szeredi595afaf2010-09-07 13:42:41 +02001952 end_queued_requests(fc);
Bryan Green357ccf22011-03-01 16:43:52 -08001953 end_polls(fc);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001954 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -07001955 wake_up_all(&fc->blocked_waitq);
Jeff Dike385a17b2006-04-10 22:54:52 -07001956 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001957 }
Miklos Szeredid7133112006-04-10 22:54:55 -07001958 spin_unlock(&fc->lock);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001959}
Tejun Heo08cbf542009-04-14 10:54:53 +09001960EXPORT_SYMBOL_GPL(fuse_abort_conn);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -08001961
Tejun Heo08cbf542009-04-14 10:54:53 +09001962int fuse_dev_release(struct inode *inode, struct file *file)
Miklos Szeredi334f4852005-09-09 13:10:27 -07001963{
Miklos Szeredi0720b312006-04-10 22:54:55 -07001964 struct fuse_conn *fc = fuse_get_conn(file);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001965 if (fc) {
Miklos Szeredid7133112006-04-10 22:54:55 -07001966 spin_lock(&fc->lock);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001967 fc->connected = 0;
Miklos Szeredi595afaf2010-09-07 13:42:41 +02001968 fc->blocked = 0;
1969 end_queued_requests(fc);
Bryan Green357ccf22011-03-01 16:43:52 -08001970 end_polls(fc);
Miklos Szeredi595afaf2010-09-07 13:42:41 +02001971 wake_up_all(&fc->blocked_waitq);
Miklos Szeredid7133112006-04-10 22:54:55 -07001972 spin_unlock(&fc->lock);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001973 fuse_conn_put(fc);
Jeff Dike385a17b2006-04-10 22:54:52 -07001974 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001975
Miklos Szeredi334f4852005-09-09 13:10:27 -07001976 return 0;
1977}
Tejun Heo08cbf542009-04-14 10:54:53 +09001978EXPORT_SYMBOL_GPL(fuse_dev_release);
Miklos Szeredi334f4852005-09-09 13:10:27 -07001979
Jeff Dike385a17b2006-04-10 22:54:52 -07001980static int fuse_dev_fasync(int fd, struct file *file, int on)
1981{
1982 struct fuse_conn *fc = fuse_get_conn(file);
1983 if (!fc)
Miklos Szeredia87046d2006-04-10 22:54:56 -07001984 return -EPERM;
Jeff Dike385a17b2006-04-10 22:54:52 -07001985
1986 /* No locking - fasync_helper does its own locking */
1987 return fasync_helper(fd, file, on, &fc->fasync);
1988}
1989
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001990const struct file_operations fuse_dev_operations = {
Miklos Szeredi334f4852005-09-09 13:10:27 -07001991 .owner = THIS_MODULE,
1992 .llseek = no_llseek,
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001993 .read = do_sync_read,
1994 .aio_read = fuse_dev_read,
Miklos Szeredic3021622010-05-25 15:06:07 +02001995 .splice_read = fuse_dev_splice_read,
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001996 .write = do_sync_write,
1997 .aio_write = fuse_dev_write,
Miklos Szeredidd3bb142010-05-25 15:06:06 +02001998 .splice_write = fuse_dev_splice_write,
Miklos Szeredi334f4852005-09-09 13:10:27 -07001999 .poll = fuse_dev_poll,
2000 .release = fuse_dev_release,
Jeff Dike385a17b2006-04-10 22:54:52 -07002001 .fasync = fuse_dev_fasync,
Miklos Szeredi334f4852005-09-09 13:10:27 -07002002};
Tejun Heo08cbf542009-04-14 10:54:53 +09002003EXPORT_SYMBOL_GPL(fuse_dev_operations);
Miklos Szeredi334f4852005-09-09 13:10:27 -07002004
2005static struct miscdevice fuse_miscdevice = {
2006 .minor = FUSE_MINOR,
2007 .name = "fuse",
2008 .fops = &fuse_dev_operations,
2009};
2010
2011int __init fuse_dev_init(void)
2012{
2013 int err = -ENOMEM;
2014 fuse_req_cachep = kmem_cache_create("fuse_request",
2015 sizeof(struct fuse_req),
Paul Mundt20c2df82007-07-20 10:11:58 +09002016 0, 0, NULL);
Miklos Szeredi334f4852005-09-09 13:10:27 -07002017 if (!fuse_req_cachep)
2018 goto out;
2019
2020 err = misc_register(&fuse_miscdevice);
2021 if (err)
2022 goto out_cache_clean;
2023
2024 return 0;
2025
2026 out_cache_clean:
2027 kmem_cache_destroy(fuse_req_cachep);
2028 out:
2029 return err;
2030}
2031
2032void fuse_dev_cleanup(void)
2033{
2034 misc_deregister(&fuse_miscdevice);
2035 kmem_cache_destroy(fuse_req_cachep);
2036}