Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
d7133114 | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include <linux/fuse.h> | |
10 | #include <linux/fs.h> | |
51eb01e7 | 11 | #include <linux/mount.h> |
d8a5ba45 MS |
12 | #include <linux/wait.h> |
13 | #include <linux/list.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/backing-dev.h> | |
bafa9654 | 17 | #include <linux/mutex.h> |
d8a5ba45 | 18 | |
334f485d MS |
19 | /** Max number of pages that can be used in a single read request */ |
20 | #define FUSE_MAX_PAGES_PER_REQ 32 | |
21 | ||
08a53cdc | 22 | /** Maximum number of outstanding background requests */ |
f92b99b9 MS |
23 | #define FUSE_MAX_BACKGROUND 12 |
24 | ||
25 | /** Congestion starts at 75% of maximum */ | |
26 | #define FUSE_CONGESTION_THRESHOLD (FUSE_MAX_BACKGROUND * 75 / 100) | |
08a53cdc | 27 | |
1d3d752b MS |
28 | /** It could be as large as PATH_MAX, but would that have any uses? */ |
29 | #define FUSE_NAME_MAX 1024 | |
30 | ||
bafa9654 MS |
31 | /** Number of dentries for each connection in the control filesystem */ |
32 | #define FUSE_CTL_NUM_DENTRIES 3 | |
33 | ||
1e9a4ed9 MS |
34 | /** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem |
35 | module will check permissions based on the file mode. Otherwise no | |
36 | permission checking is done in the kernel */ | |
37 | #define FUSE_DEFAULT_PERMISSIONS (1 << 0) | |
38 | ||
39 | /** If the FUSE_ALLOW_OTHER flag is given, then not only the user | |
40 | doing the mount will be allowed to access the filesystem */ | |
41 | #define FUSE_ALLOW_OTHER (1 << 1) | |
42 | ||
bafa9654 MS |
43 | /** List of active connections */ |
44 | extern struct list_head fuse_conn_list; | |
45 | ||
46 | /** Global mutex protecting fuse_conn_list and the control filesystem */ | |
47 | extern struct mutex fuse_mutex; | |
413ef8cb | 48 | |
d8a5ba45 MS |
49 | /** FUSE inode */ |
50 | struct fuse_inode { | |
51 | /** Inode data */ | |
52 | struct inode inode; | |
53 | ||
54 | /** Unique ID, which identifies the inode between userspace | |
55 | * and kernel */ | |
56 | u64 nodeid; | |
57 | ||
9e6268db MS |
58 | /** Number of lookups on this inode */ |
59 | u64 nlookup; | |
60 | ||
e5e5558e MS |
61 | /** The request used for sending the FORGET message */ |
62 | struct fuse_req *forget_req; | |
63 | ||
d8a5ba45 | 64 | /** Time in jiffies until the file attributes are valid */ |
0a0898cf | 65 | u64 i_time; |
ebc14c4d MS |
66 | |
67 | /** The sticky bit in inode->i_mode may have been removed, so | |
68 | preserve the original mode */ | |
69 | mode_t orig_i_mode; | |
1fb69e78 MS |
70 | |
71 | /** Version of last attribute change */ | |
72 | u64 attr_version; | |
93a8c3cd MS |
73 | |
74 | /** Files usable in writepage. Protected by fc->lock */ | |
75 | struct list_head write_files; | |
d8a5ba45 MS |
76 | }; |
77 | ||
b6aeaded MS |
78 | /** FUSE specific file data */ |
79 | struct fuse_file { | |
80 | /** Request reserved for flush and release */ | |
33649c91 | 81 | struct fuse_req *reserved_req; |
b6aeaded MS |
82 | |
83 | /** File handle used by userspace */ | |
84 | u64 fh; | |
c756e0a4 MS |
85 | |
86 | /** Refcount */ | |
87 | atomic_t count; | |
93a8c3cd MS |
88 | |
89 | /** Entry on inode's write_files list */ | |
90 | struct list_head write_entry; | |
b6aeaded MS |
91 | }; |
92 | ||
334f485d MS |
93 | /** One input argument of a request */ |
94 | struct fuse_in_arg { | |
95 | unsigned size; | |
96 | const void *value; | |
97 | }; | |
98 | ||
99 | /** The request input */ | |
100 | struct fuse_in { | |
101 | /** The request header */ | |
102 | struct fuse_in_header h; | |
103 | ||
104 | /** True if the data for the last argument is in req->pages */ | |
105 | unsigned argpages:1; | |
106 | ||
107 | /** Number of arguments */ | |
108 | unsigned numargs; | |
109 | ||
110 | /** Array of arguments */ | |
111 | struct fuse_in_arg args[3]; | |
112 | }; | |
113 | ||
114 | /** One output argument of a request */ | |
115 | struct fuse_arg { | |
116 | unsigned size; | |
117 | void *value; | |
118 | }; | |
119 | ||
120 | /** The request output */ | |
121 | struct fuse_out { | |
122 | /** Header returned from userspace */ | |
123 | struct fuse_out_header h; | |
124 | ||
095da6cb MS |
125 | /* |
126 | * The following bitfields are not changed during the request | |
127 | * processing | |
128 | */ | |
129 | ||
334f485d MS |
130 | /** Last argument is variable length (can be shorter than |
131 | arg->size) */ | |
132 | unsigned argvar:1; | |
133 | ||
134 | /** Last argument is a list of pages to copy data to */ | |
135 | unsigned argpages:1; | |
136 | ||
137 | /** Zero partially or not copied pages */ | |
138 | unsigned page_zeroing:1; | |
139 | ||
140 | /** Number or arguments */ | |
141 | unsigned numargs; | |
142 | ||
143 | /** Array of arguments */ | |
144 | struct fuse_arg args[3]; | |
145 | }; | |
146 | ||
83cfd493 MS |
147 | /** The request state */ |
148 | enum fuse_req_state { | |
149 | FUSE_REQ_INIT = 0, | |
150 | FUSE_REQ_PENDING, | |
151 | FUSE_REQ_READING, | |
152 | FUSE_REQ_SENT, | |
a4d27e75 | 153 | FUSE_REQ_WRITING, |
83cfd493 MS |
154 | FUSE_REQ_FINISHED |
155 | }; | |
156 | ||
64c6d8ed MS |
157 | struct fuse_conn; |
158 | ||
334f485d MS |
159 | /** |
160 | * A request to the client | |
161 | */ | |
162 | struct fuse_req { | |
ce1d5a49 MS |
163 | /** This can be on either pending processing or io lists in |
164 | fuse_conn */ | |
334f485d MS |
165 | struct list_head list; |
166 | ||
a4d27e75 MS |
167 | /** Entry on the interrupts list */ |
168 | struct list_head intr_entry; | |
169 | ||
334f485d MS |
170 | /** refcount */ |
171 | atomic_t count; | |
172 | ||
a4d27e75 MS |
173 | /** Unique ID for the interrupt request */ |
174 | u64 intr_unique; | |
175 | ||
095da6cb MS |
176 | /* |
177 | * The following bitfields are either set once before the | |
178 | * request is queued or setting/clearing them is protected by | |
d7133114 | 179 | * fuse_conn->lock |
095da6cb MS |
180 | */ |
181 | ||
334f485d MS |
182 | /** True if the request has reply */ |
183 | unsigned isreply:1; | |
184 | ||
51eb01e7 MS |
185 | /** Force sending of the request even if interrupted */ |
186 | unsigned force:1; | |
187 | ||
f9a2842e MS |
188 | /** The request was aborted */ |
189 | unsigned aborted:1; | |
334f485d MS |
190 | |
191 | /** Request is sent in the background */ | |
192 | unsigned background:1; | |
193 | ||
a4d27e75 MS |
194 | /** The request has been interrupted */ |
195 | unsigned interrupted:1; | |
196 | ||
334f485d MS |
197 | /** Data is being copied to/from the request */ |
198 | unsigned locked:1; | |
199 | ||
9bc5ddda MS |
200 | /** Request is counted as "waiting" */ |
201 | unsigned waiting:1; | |
202 | ||
83cfd493 MS |
203 | /** State of the request */ |
204 | enum fuse_req_state state; | |
334f485d MS |
205 | |
206 | /** The request input */ | |
207 | struct fuse_in in; | |
208 | ||
209 | /** The request output */ | |
210 | struct fuse_out out; | |
211 | ||
212 | /** Used to wake up the task waiting for completion of request*/ | |
213 | wait_queue_head_t waitq; | |
214 | ||
215 | /** Data for asynchronous requests */ | |
216 | union { | |
e5e5558e | 217 | struct fuse_forget_in forget_in; |
b6aeaded | 218 | struct fuse_release_in release_in; |
3ec870d5 MS |
219 | struct fuse_init_in init_in; |
220 | struct fuse_init_out init_out; | |
361b1eb5 | 221 | struct fuse_read_in read_in; |
b25e82e5 MS |
222 | struct { |
223 | struct fuse_write_in in; | |
224 | struct fuse_write_out out; | |
225 | } write; | |
71421259 | 226 | struct fuse_lk_in lk_in; |
334f485d MS |
227 | } misc; |
228 | ||
229 | /** page vector */ | |
230 | struct page *pages[FUSE_MAX_PAGES_PER_REQ]; | |
231 | ||
232 | /** number of pages in vector */ | |
233 | unsigned num_pages; | |
234 | ||
235 | /** offset of data on first page */ | |
236 | unsigned page_offset; | |
237 | ||
334f485d | 238 | /** File used in the request (or NULL) */ |
c756e0a4 | 239 | struct fuse_file *ff; |
64c6d8ed | 240 | |
51eb01e7 MS |
241 | /** vfsmount used in release */ |
242 | struct vfsmount *vfsmount; | |
243 | ||
244 | /** dentry used in release */ | |
245 | struct dentry *dentry; | |
246 | ||
64c6d8ed MS |
247 | /** Request completion callback */ |
248 | void (*end)(struct fuse_conn *, struct fuse_req *); | |
33649c91 MS |
249 | |
250 | /** Request is stolen from fuse_file->reserved_req */ | |
251 | struct file *stolen_file; | |
334f485d MS |
252 | }; |
253 | ||
d8a5ba45 MS |
254 | /** |
255 | * A Fuse connection. | |
256 | * | |
257 | * This structure is created, when the filesystem is mounted, and is | |
258 | * destroyed, when the client device is closed and the filesystem is | |
259 | * unmounted. | |
260 | */ | |
261 | struct fuse_conn { | |
d7133114 MS |
262 | /** Lock protecting accessess to members of this structure */ |
263 | spinlock_t lock; | |
264 | ||
d2a85164 MS |
265 | /** Mutex protecting against directory alias creation */ |
266 | struct mutex inst_mutex; | |
267 | ||
bafa9654 MS |
268 | /** Refcount */ |
269 | atomic_t count; | |
270 | ||
d8a5ba45 MS |
271 | /** The user id for this mount */ |
272 | uid_t user_id; | |
273 | ||
87729a55 MS |
274 | /** The group id for this mount */ |
275 | gid_t group_id; | |
276 | ||
1e9a4ed9 MS |
277 | /** The fuse mount flags for this mount */ |
278 | unsigned flags; | |
279 | ||
db50b96c MS |
280 | /** Maximum read size */ |
281 | unsigned max_read; | |
282 | ||
413ef8cb MS |
283 | /** Maximum write size */ |
284 | unsigned max_write; | |
285 | ||
334f485d MS |
286 | /** Readers of the connection are waiting on this */ |
287 | wait_queue_head_t waitq; | |
288 | ||
289 | /** The list of pending requests */ | |
290 | struct list_head pending; | |
291 | ||
292 | /** The list of requests being processed */ | |
293 | struct list_head processing; | |
294 | ||
d77a1d5b MS |
295 | /** The list of requests under I/O */ |
296 | struct list_head io; | |
297 | ||
08a53cdc MS |
298 | /** Number of requests currently in the background */ |
299 | unsigned num_background; | |
300 | ||
a4d27e75 MS |
301 | /** Pending interrupts */ |
302 | struct list_head interrupts; | |
303 | ||
08a53cdc MS |
304 | /** Flag indicating if connection is blocked. This will be |
305 | the case before the INIT reply is received, and if there | |
306 | are too many outstading backgrounds requests */ | |
307 | int blocked; | |
308 | ||
309 | /** waitq for blocked connection */ | |
310 | wait_queue_head_t blocked_waitq; | |
de5e3dec MS |
311 | |
312 | /** waitq for reserved requests */ | |
313 | wait_queue_head_t reserved_req_waitq; | |
08a53cdc | 314 | |
334f485d MS |
315 | /** The next unique request id */ |
316 | u64 reqctr; | |
317 | ||
69a53bf2 MS |
318 | /** Connection established, cleared on umount, connection |
319 | abort and device release */ | |
095da6cb | 320 | unsigned connected; |
1e9a4ed9 | 321 | |
095da6cb MS |
322 | /** Connection failed (version mismatch). Cannot race with |
323 | setting other bitfields since it is only set once in INIT | |
324 | reply, before any other request, and never cleared */ | |
334f485d MS |
325 | unsigned conn_error : 1; |
326 | ||
0ec7ca41 MS |
327 | /** Connection successful. Only set in INIT */ |
328 | unsigned conn_init : 1; | |
329 | ||
9cd68455 MS |
330 | /** Do readpages asynchronously? Only set in INIT */ |
331 | unsigned async_read : 1; | |
332 | ||
6ff958ed MS |
333 | /** Do not send separate SETATTR request before open(O_TRUNC) */ |
334 | unsigned atomic_o_trunc : 1; | |
335 | ||
095da6cb MS |
336 | /* |
337 | * The following bitfields are only for optimization purposes | |
338 | * and hence races in setting them will not cause malfunction | |
339 | */ | |
340 | ||
b6aeaded MS |
341 | /** Is fsync not implemented by fs? */ |
342 | unsigned no_fsync : 1; | |
343 | ||
82547981 MS |
344 | /** Is fsyncdir not implemented by fs? */ |
345 | unsigned no_fsyncdir : 1; | |
346 | ||
b6aeaded MS |
347 | /** Is flush not implemented by fs? */ |
348 | unsigned no_flush : 1; | |
349 | ||
92a8780e MS |
350 | /** Is setxattr not implemented by fs? */ |
351 | unsigned no_setxattr : 1; | |
352 | ||
353 | /** Is getxattr not implemented by fs? */ | |
354 | unsigned no_getxattr : 1; | |
355 | ||
356 | /** Is listxattr not implemented by fs? */ | |
357 | unsigned no_listxattr : 1; | |
358 | ||
359 | /** Is removexattr not implemented by fs? */ | |
360 | unsigned no_removexattr : 1; | |
361 | ||
71421259 MS |
362 | /** Are file locking primitives not implemented by fs? */ |
363 | unsigned no_lock : 1; | |
364 | ||
31d40d74 MS |
365 | /** Is access not implemented by fs? */ |
366 | unsigned no_access : 1; | |
367 | ||
fd72faac MS |
368 | /** Is create not implemented by fs? */ |
369 | unsigned no_create : 1; | |
370 | ||
a4d27e75 MS |
371 | /** Is interrupt not implemented by fs? */ |
372 | unsigned no_interrupt : 1; | |
373 | ||
b2d2272f MS |
374 | /** Is bmap not implemented by fs? */ |
375 | unsigned no_bmap : 1; | |
376 | ||
0cd5b885 MS |
377 | /** The number of requests waiting for completion */ |
378 | atomic_t num_waiting; | |
379 | ||
45714d65 MS |
380 | /** Negotiated minor version */ |
381 | unsigned minor; | |
382 | ||
d8a5ba45 MS |
383 | /** Backing dev info */ |
384 | struct backing_dev_info bdi; | |
f543f253 | 385 | |
bafa9654 MS |
386 | /** Entry on the fuse_conn_list */ |
387 | struct list_head entry; | |
388 | ||
389 | /** Unique ID */ | |
390 | u64 id; | |
391 | ||
392 | /** Dentries in the control filesystem */ | |
393 | struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; | |
394 | ||
395 | /** number of dentries used in the above array */ | |
396 | int ctl_ndents; | |
385a17bf JD |
397 | |
398 | /** O_ASYNC requests */ | |
399 | struct fasync_struct *fasync; | |
9c8ef561 MS |
400 | |
401 | /** Key for lock owner ID scrambling */ | |
402 | u32 scramble_key[4]; | |
0ec7ca41 MS |
403 | |
404 | /** Reserved request for the DESTROY message */ | |
405 | struct fuse_req *destroy_req; | |
1fb69e78 MS |
406 | |
407 | /** Version counter for attribute changes */ | |
408 | u64 attr_version; | |
d8a5ba45 MS |
409 | }; |
410 | ||
d8a5ba45 MS |
411 | static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) |
412 | { | |
6383bdaa | 413 | return sb->s_fs_info; |
d8a5ba45 MS |
414 | } |
415 | ||
416 | static inline struct fuse_conn *get_fuse_conn(struct inode *inode) | |
417 | { | |
418 | return get_fuse_conn_super(inode->i_sb); | |
419 | } | |
420 | ||
421 | static inline struct fuse_inode *get_fuse_inode(struct inode *inode) | |
422 | { | |
423 | return container_of(inode, struct fuse_inode, inode); | |
424 | } | |
425 | ||
426 | static inline u64 get_node_id(struct inode *inode) | |
427 | { | |
428 | return get_fuse_inode(inode)->nodeid; | |
429 | } | |
430 | ||
334f485d | 431 | /** Device operations */ |
4b6f5d20 | 432 | extern const struct file_operations fuse_dev_operations; |
334f485d | 433 | |
e5e5558e MS |
434 | /** |
435 | * Get a filled in inode | |
436 | */ | |
437 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
1fb69e78 MS |
438 | int generation, struct fuse_attr *attr, |
439 | u64 attr_valid, u64 attr_version); | |
e5e5558e MS |
440 | |
441 | /** | |
442 | * Send FORGET command | |
443 | */ | |
444 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, | |
9e6268db | 445 | unsigned long nodeid, u64 nlookup); |
e5e5558e | 446 | |
04730fef | 447 | /** |
361b1eb5 | 448 | * Initialize READ or READDIR request |
04730fef | 449 | */ |
c756e0a4 | 450 | void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff, |
361b1eb5 | 451 | struct inode *inode, loff_t pos, size_t count, int opcode); |
04730fef MS |
452 | |
453 | /** | |
454 | * Send OPEN or OPENDIR request | |
455 | */ | |
456 | int fuse_open_common(struct inode *inode, struct file *file, int isdir); | |
457 | ||
fd72faac MS |
458 | struct fuse_file *fuse_file_alloc(void); |
459 | void fuse_file_free(struct fuse_file *ff); | |
460 | void fuse_finish_open(struct inode *inode, struct file *file, | |
461 | struct fuse_file *ff, struct fuse_open_out *outarg); | |
462 | ||
c756e0a4 MS |
463 | /** Fill in ff->reserved_req with a RELEASE request */ |
464 | void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode); | |
465 | ||
04730fef MS |
466 | /** |
467 | * Send RELEASE or RELEASEDIR request | |
468 | */ | |
469 | int fuse_release_common(struct inode *inode, struct file *file, int isdir); | |
470 | ||
82547981 MS |
471 | /** |
472 | * Send FSYNC or FSYNCDIR request | |
473 | */ | |
474 | int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, | |
475 | int isdir); | |
476 | ||
b6aeaded | 477 | /** |
1779381d | 478 | * Initialize file operations on a regular file |
b6aeaded MS |
479 | */ |
480 | void fuse_init_file_inode(struct inode *inode); | |
481 | ||
e5e5558e | 482 | /** |
1779381d | 483 | * Initialize inode operations on regular files and special files |
e5e5558e MS |
484 | */ |
485 | void fuse_init_common(struct inode *inode); | |
486 | ||
487 | /** | |
1779381d | 488 | * Initialize inode and file operations on a directory |
e5e5558e MS |
489 | */ |
490 | void fuse_init_dir(struct inode *inode); | |
491 | ||
492 | /** | |
1779381d | 493 | * Initialize inode operations on a symlink |
e5e5558e MS |
494 | */ |
495 | void fuse_init_symlink(struct inode *inode); | |
496 | ||
497 | /** | |
498 | * Change attributes of an inode | |
499 | */ | |
1fb69e78 MS |
500 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
501 | u64 attr_valid, u64 attr_version); | |
e5e5558e | 502 | |
334f485d MS |
503 | /** |
504 | * Initialize the client device | |
505 | */ | |
506 | int fuse_dev_init(void); | |
507 | ||
508 | /** | |
509 | * Cleanup the client device | |
510 | */ | |
511 | void fuse_dev_cleanup(void); | |
512 | ||
bafa9654 MS |
513 | int fuse_ctl_init(void); |
514 | void fuse_ctl_cleanup(void); | |
515 | ||
334f485d MS |
516 | /** |
517 | * Allocate a request | |
518 | */ | |
519 | struct fuse_req *fuse_request_alloc(void); | |
520 | ||
521 | /** | |
522 | * Free a request | |
523 | */ | |
524 | void fuse_request_free(struct fuse_req *req); | |
525 | ||
334f485d | 526 | /** |
33649c91 | 527 | * Get a request, may fail with -ENOMEM |
334f485d | 528 | */ |
ce1d5a49 | 529 | struct fuse_req *fuse_get_req(struct fuse_conn *fc); |
334f485d | 530 | |
33649c91 MS |
531 | /** |
532 | * Gets a requests for a file operation, always succeeds | |
533 | */ | |
534 | struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file); | |
535 | ||
334f485d | 536 | /** |
ce1d5a49 MS |
537 | * Decrement reference count of a request. If count goes to zero free |
538 | * the request. | |
334f485d MS |
539 | */ |
540 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); | |
541 | ||
542 | /** | |
7c352bdf | 543 | * Send a request (synchronous) |
334f485d MS |
544 | */ |
545 | void request_send(struct fuse_conn *fc, struct fuse_req *req); | |
546 | ||
334f485d MS |
547 | /** |
548 | * Send a request with no reply | |
549 | */ | |
550 | void request_send_noreply(struct fuse_conn *fc, struct fuse_req *req); | |
551 | ||
552 | /** | |
553 | * Send a request in the background | |
554 | */ | |
555 | void request_send_background(struct fuse_conn *fc, struct fuse_req *req); | |
556 | ||
5a5fb1ea | 557 | /* Abort all requests */ |
69a53bf2 MS |
558 | void fuse_abort_conn(struct fuse_conn *fc); |
559 | ||
e5e5558e MS |
560 | /** |
561 | * Invalidate inode attributes | |
562 | */ | |
563 | void fuse_invalidate_attr(struct inode *inode); | |
bafa9654 MS |
564 | |
565 | /** | |
566 | * Acquire reference to fuse_conn | |
567 | */ | |
568 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); | |
569 | ||
570 | /** | |
571 | * Release reference to fuse_conn | |
572 | */ | |
573 | void fuse_conn_put(struct fuse_conn *fc); | |
574 | ||
575 | /** | |
576 | * Add connection to control filesystem | |
577 | */ | |
578 | int fuse_ctl_add_conn(struct fuse_conn *fc); | |
579 | ||
580 | /** | |
581 | * Remove connection from control filesystem | |
582 | */ | |
583 | void fuse_ctl_remove_conn(struct fuse_conn *fc); | |
a5bfffac TS |
584 | |
585 | /** | |
586 | * Is file type valid? | |
587 | */ | |
588 | int fuse_valid_type(int m); | |
e57ac683 MS |
589 | |
590 | /** | |
591 | * Is task allowed to perform filesystem operation? | |
592 | */ | |
593 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task); |