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1/*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
4
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#ifndef _FS_FUSE_I_H
10#define _FS_FUSE_I_H
11
12#include <linux/fuse.h>
13#include <linux/fs.h>
14#include <linux/mount.h>
15#include <linux/wait.h>
16#include <linux/list.h>
17#include <linux/spinlock.h>
18#include <linux/mm.h>
19#include <linux/backing-dev.h>
20#include <linux/mutex.h>
21#include <linux/rwsem.h>
22#include <linux/rbtree.h>
23#include <linux/poll.h>
24#include <linux/workqueue.h>
25
26/** Max number of pages that can be used in a single read request */
27#define FUSE_MAX_PAGES_PER_REQ 32
28
29/** Bias for fi->writectr, meaning new writepages must not be sent */
30#define FUSE_NOWRITE INT_MIN
31
32/** It could be as large as PATH_MAX, but would that have any uses? */
33#define FUSE_NAME_MAX 1024
34
35/** Number of dentries for each connection in the control filesystem */
36#define FUSE_CTL_NUM_DENTRIES 5
37
38/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
39 module will check permissions based on the file mode. Otherwise no
40 permission checking is done in the kernel */
41#define FUSE_DEFAULT_PERMISSIONS (1 << 0)
42
43/** If the FUSE_ALLOW_OTHER flag is given, then not only the user
44 doing the mount will be allowed to access the filesystem */
45#define FUSE_ALLOW_OTHER (1 << 1)
46
47/** List of active connections */
48extern struct list_head fuse_conn_list;
49
50/** Global mutex protecting fuse_conn_list and the control filesystem */
51extern struct mutex fuse_mutex;
52
53/** Module parameters */
54extern unsigned max_user_bgreq;
55extern unsigned max_user_congthresh;
56
57/* One forget request */
58struct fuse_forget_link {
59 struct fuse_forget_one forget_one;
60 struct fuse_forget_link *next;
61};
62
63/** FUSE inode */
64struct fuse_inode {
65 /** Inode data */
66 struct inode inode;
67
68 /** Unique ID, which identifies the inode between userspace
69 * and kernel */
70 u64 nodeid;
71
72 /** Number of lookups on this inode */
73 u64 nlookup;
74
75 /** The request used for sending the FORGET message */
76 struct fuse_forget_link *forget;
77
78 /** Time in jiffies until the file attributes are valid */
79 u64 i_time;
80
81 /** The sticky bit in inode->i_mode may have been removed, so
82 preserve the original mode */
83 umode_t orig_i_mode;
84
85 /** 64 bit inode number */
86 u64 orig_ino;
87
88 /** Version of last attribute change */
89 u64 attr_version;
90
91 /** Files usable in writepage. Protected by fc->lock */
92 struct list_head write_files;
93
94 /** Writepages pending on truncate or fsync */
95 struct list_head queued_writes;
96
97 /** Number of sent writes, a negative bias (FUSE_NOWRITE)
98 * means more writes are blocked */
99 int writectr;
100
101 /** Waitq for writepage completion */
102 wait_queue_head_t page_waitq;
103
104 /** List of writepage requestst (pending or sent) */
105 struct list_head writepages;
106};
107
108struct fuse_conn;
109
110/** FUSE specific file data */
111struct fuse_file {
112 /** Fuse connection for this file */
113 struct fuse_conn *fc;
114
115 /** Request reserved for flush and release */
116 struct fuse_req *reserved_req;
117
118 /** Kernel file handle guaranteed to be unique */
119 u64 kh;
120
121 /** File handle used by userspace */
122 u64 fh;
123
124 /** Node id of this file */
125 u64 nodeid;
126
127 /** Refcount */
128 atomic_t count;
129
130 /** FOPEN_* flags returned by open */
131 u32 open_flags;
132
133 /** Entry on inode's write_files list */
134 struct list_head write_entry;
135
136 /** RB node to be linked on fuse_conn->polled_files */
137 struct rb_node polled_node;
138
139 /** Wait queue head for poll */
140 wait_queue_head_t poll_wait;
141
142 /** Has flock been performed on this file? */
143 bool flock:1;
144};
145
146/** One input argument of a request */
147struct fuse_in_arg {
148 unsigned size;
149 const void *value;
150};
151
152/** The request input */
153struct fuse_in {
154 /** The request header */
155 struct fuse_in_header h;
156
157 /** True if the data for the last argument is in req->pages */
158 unsigned argpages:1;
159
160 /** Number of arguments */
161 unsigned numargs;
162
163 /** Array of arguments */
164 struct fuse_in_arg args[3];
165};
166
167/** One output argument of a request */
168struct fuse_arg {
169 unsigned size;
170 void *value;
171};
172
173/** The request output */
174struct fuse_out {
175 /** Header returned from userspace */
176 struct fuse_out_header h;
177
178 /*
179 * The following bitfields are not changed during the request
180 * processing
181 */
182
183 /** Last argument is variable length (can be shorter than
184 arg->size) */
185 unsigned argvar:1;
186
187 /** Last argument is a list of pages to copy data to */
188 unsigned argpages:1;
189
190 /** Zero partially or not copied pages */
191 unsigned page_zeroing:1;
192
193 /** Pages may be replaced with new ones */
194 unsigned page_replace:1;
195
196 /** Number or arguments */
197 unsigned numargs;
198
199 /** Array of arguments */
200 struct fuse_arg args[3];
201};
202
203/** The request state */
204enum fuse_req_state {
205 FUSE_REQ_INIT = 0,
206 FUSE_REQ_PENDING,
207 FUSE_REQ_READING,
208 FUSE_REQ_SENT,
209 FUSE_REQ_WRITING,
210 FUSE_REQ_FINISHED
211};
212
213/**
214 * A request to the client
215 */
216struct fuse_req {
217 /** This can be on either pending processing or io lists in
218 fuse_conn */
219 struct list_head list;
220
221 /** Entry on the interrupts list */
222 struct list_head intr_entry;
223
224 /** refcount */
225 atomic_t count;
226
227 /** Unique ID for the interrupt request */
228 u64 intr_unique;
229
230 /*
231 * The following bitfields are either set once before the
232 * request is queued or setting/clearing them is protected by
233 * fuse_conn->lock
234 */
235
236 /** True if the request has reply */
237 unsigned isreply:1;
238
239 /** Force sending of the request even if interrupted */
240 unsigned force:1;
241
242 /** The request was aborted */
243 unsigned aborted:1;
244
245 /** Request is sent in the background */
246 unsigned background:1;
247
248 /** The request has been interrupted */
249 unsigned interrupted:1;
250
251 /** Data is being copied to/from the request */
252 unsigned locked:1;
253
254 /** Request is counted as "waiting" */
255 unsigned waiting:1;
256
257 /** State of the request */
258 enum fuse_req_state state;
259
260 /** The request input */
261 struct fuse_in in;
262
263 /** The request output */
264 struct fuse_out out;
265
266 /** Used to wake up the task waiting for completion of request*/
267 wait_queue_head_t waitq;
268
269 /** Data for asynchronous requests */
270 union {
271 struct {
272 union {
273 struct fuse_release_in in;
274 struct work_struct work;
275 };
276 struct path path;
277 } release;
278 struct fuse_init_in init_in;
279 struct fuse_init_out init_out;
280 struct cuse_init_in cuse_init_in;
281 struct {
282 struct fuse_read_in in;
283 u64 attr_ver;
284 } read;
285 struct {
286 struct fuse_write_in in;
287 struct fuse_write_out out;
288 } write;
289 struct fuse_notify_retrieve_in retrieve_in;
290 struct fuse_lk_in lk_in;
291 } misc;
292
293 /** page vector */
294 struct page *pages[FUSE_MAX_PAGES_PER_REQ];
295
296 /** number of pages in vector */
297 unsigned num_pages;
298
299 /** offset of data on first page */
300 unsigned page_offset;
301
302 /** File used in the request (or NULL) */
303 struct fuse_file *ff;
304
305 /** Inode used in the request or NULL */
306 struct inode *inode;
307
308 /** Link on fi->writepages */
309 struct list_head writepages_entry;
310
311 /** Request completion callback */
312 void (*end)(struct fuse_conn *, struct fuse_req *);
313
314 /** Request is stolen from fuse_file->reserved_req */
315 struct file *stolen_file;
316};
317
318/**
319 * A Fuse connection.
320 *
321 * This structure is created, when the filesystem is mounted, and is
322 * destroyed, when the client device is closed and the filesystem is
323 * unmounted.
324 */
325struct fuse_conn {
326 /** Lock protecting accessess to members of this structure */
327 spinlock_t lock;
328
329 /** Mutex protecting against directory alias creation */
330 struct mutex inst_mutex;
331
332 /** Refcount */
333 atomic_t count;
334
335 /** The user id for this mount */
336 uid_t user_id;
337
338 /** The group id for this mount */
339 gid_t group_id;
340
341 /** The fuse mount flags for this mount */
342 unsigned flags;
343
344 /** Maximum read size */
345 unsigned max_read;
346
347 /** Maximum write size */
348 unsigned max_write;
349
350 /** Readers of the connection are waiting on this */
351 wait_queue_head_t waitq;
352
353 /** The list of pending requests */
354 struct list_head pending;
355
356 /** The list of requests being processed */
357 struct list_head processing;
358
359 /** The list of requests under I/O */
360 struct list_head io;
361
362 /** The next unique kernel file handle */
363 u64 khctr;
364
365 /** rbtree of fuse_files waiting for poll events indexed by ph */
366 struct rb_root polled_files;
367
368 /** Maximum number of outstanding background requests */
369 unsigned max_background;
370
371 /** Number of background requests at which congestion starts */
372 unsigned congestion_threshold;
373
374 /** Number of requests currently in the background */
375 unsigned num_background;
376
377 /** Number of background requests currently queued for userspace */
378 unsigned active_background;
379
380 /** The list of background requests set aside for later queuing */
381 struct list_head bg_queue;
382
383 /** Pending interrupts */
384 struct list_head interrupts;
385
386 /** Queue of pending forgets */
387 struct fuse_forget_link forget_list_head;
388 struct fuse_forget_link *forget_list_tail;
389
390 /** Batching of FORGET requests (positive indicates FORGET batch) */
391 int forget_batch;
392
393 /** Flag indicating if connection is blocked. This will be
394 the case before the INIT reply is received, and if there
395 are too many outstading backgrounds requests */
396 int blocked;
397
398 /** waitq for blocked connection */
399 wait_queue_head_t blocked_waitq;
400
401 /** waitq for reserved requests */
402 wait_queue_head_t reserved_req_waitq;
403
404 /** The next unique request id */
405 u64 reqctr;
406
407 /** Connection established, cleared on umount, connection
408 abort and device release */
409 unsigned connected;
410
411 /** Connection failed (version mismatch). Cannot race with
412 setting other bitfields since it is only set once in INIT
413 reply, before any other request, and never cleared */
414 unsigned conn_error:1;
415
416 /** Connection successful. Only set in INIT */
417 unsigned conn_init:1;
418
419 /** Do readpages asynchronously? Only set in INIT */
420 unsigned async_read:1;
421
422 /** Do not send separate SETATTR request before open(O_TRUNC) */
423 unsigned atomic_o_trunc:1;
424
425 /** Filesystem supports NFS exporting. Only set in INIT */
426 unsigned export_support:1;
427
428 /** Set if bdi is valid */
429 unsigned bdi_initialized:1;
430
431 /*
432 * The following bitfields are only for optimization purposes
433 * and hence races in setting them will not cause malfunction
434 */
435
436 /** Is fsync not implemented by fs? */
437 unsigned no_fsync:1;
438
439 /** Is fsyncdir not implemented by fs? */
440 unsigned no_fsyncdir:1;
441
442 /** Is flush not implemented by fs? */
443 unsigned no_flush:1;
444
445 /** Is setxattr not implemented by fs? */
446 unsigned no_setxattr:1;
447
448 /** Is getxattr not implemented by fs? */
449 unsigned no_getxattr:1;
450
451 /** Is listxattr not implemented by fs? */
452 unsigned no_listxattr:1;
453
454 /** Is removexattr not implemented by fs? */
455 unsigned no_removexattr:1;
456
457 /** Are posix file locking primitives not implemented by fs? */
458 unsigned no_lock:1;
459
460 /** Is access not implemented by fs? */
461 unsigned no_access:1;
462
463 /** Is create not implemented by fs? */
464 unsigned no_create:1;
465
466 /** Is interrupt not implemented by fs? */
467 unsigned no_interrupt:1;
468
469 /** Is bmap not implemented by fs? */
470 unsigned no_bmap:1;
471
472 /** Is poll not implemented by fs? */
473 unsigned no_poll:1;
474
475 /** Do multi-page cached writes */
476 unsigned big_writes:1;
477
478 /** Don't apply umask to creation modes */
479 unsigned dont_mask:1;
480
481 /** Are BSD file locking primitives not implemented by fs? */
482 unsigned no_flock:1;
483
484 /** Is fallocate not implemented by fs? */
485 unsigned no_fallocate:1;
486
487 /** The number of requests waiting for completion */
488 atomic_t num_waiting;
489
490 /** Negotiated minor version */
491 unsigned minor;
492
493 /** Backing dev info */
494 struct backing_dev_info bdi;
495
496 /** Entry on the fuse_conn_list */
497 struct list_head entry;
498
499 /** Device ID from super block */
500 dev_t dev;
501
502 /** Dentries in the control filesystem */
503 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
504
505 /** number of dentries used in the above array */
506 int ctl_ndents;
507
508 /** O_ASYNC requests */
509 struct fasync_struct *fasync;
510
511 /** Key for lock owner ID scrambling */
512 u32 scramble_key[4];
513
514 /** Reserved request for the DESTROY message */
515 struct fuse_req *destroy_req;
516
517 /** Version counter for attribute changes */
518 u64 attr_version;
519
520 /** Called on final put */
521 void (*release)(struct fuse_conn *);
522
523 /** Super block for this connection. */
524 struct super_block *sb;
525
526 /** Read/write semaphore to hold when accessing sb. */
527 struct rw_semaphore killsb;
528};
529
530static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
531{
532 return sb->s_fs_info;
533}
534
535static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
536{
537 return get_fuse_conn_super(inode->i_sb);
538}
539
540static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
541{
542 return container_of(inode, struct fuse_inode, inode);
543}
544
545static inline u64 get_node_id(struct inode *inode)
546{
547 return get_fuse_inode(inode)->nodeid;
548}
549
550/** Device operations */
551extern const struct file_operations fuse_dev_operations;
552
553extern const struct dentry_operations fuse_dentry_operations;
554
555/**
556 * Inode to nodeid comparison.
557 */
558int fuse_inode_eq(struct inode *inode, void *_nodeidp);
559
560/**
561 * Get a filled in inode
562 */
563struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
564 int generation, struct fuse_attr *attr,
565 u64 attr_valid, u64 attr_version);
566
567int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
568 struct fuse_entry_out *outarg, struct inode **inode);
569
570/**
571 * Send FORGET command
572 */
573void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
574 u64 nodeid, u64 nlookup);
575
576struct fuse_forget_link *fuse_alloc_forget(void);
577
578/**
579 * Initialize READ or READDIR request
580 */
581void fuse_read_fill(struct fuse_req *req, struct file *file,
582 loff_t pos, size_t count, int opcode);
583
584/**
585 * Send OPEN or OPENDIR request
586 */
587int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
588
589struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
590struct fuse_file *fuse_file_get(struct fuse_file *ff);
591void fuse_file_free(struct fuse_file *ff);
592void fuse_finish_open(struct inode *inode, struct file *file);
593
594void fuse_sync_release(struct fuse_file *ff, int flags);
595
596/**
597 * Send RELEASE or RELEASEDIR request
598 */
599void fuse_release_common(struct file *file, int opcode);
600
601/**
602 * Send FSYNC or FSYNCDIR request
603 */
604int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
605 int datasync, int isdir);
606
607/**
608 * Notify poll wakeup
609 */
610int fuse_notify_poll_wakeup(struct fuse_conn *fc,
611 struct fuse_notify_poll_wakeup_out *outarg);
612
613/**
614 * Initialize file operations on a regular file
615 */
616void fuse_init_file_inode(struct inode *inode);
617
618/**
619 * Initialize inode operations on regular files and special files
620 */
621void fuse_init_common(struct inode *inode);
622
623/**
624 * Initialize inode and file operations on a directory
625 */
626void fuse_init_dir(struct inode *inode);
627
628/**
629 * Initialize inode operations on a symlink
630 */
631void fuse_init_symlink(struct inode *inode);
632
633/**
634 * Change attributes of an inode
635 */
636void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
637 u64 attr_valid, u64 attr_version);
638
639void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
640 u64 attr_valid);
641
642/**
643 * Initialize the client device
644 */
645int fuse_dev_init(void);
646
647/**
648 * Cleanup the client device
649 */
650void fuse_dev_cleanup(void);
651
652int fuse_ctl_init(void);
653void fuse_ctl_cleanup(void);
654
655/**
656 * Allocate a request
657 */
658struct fuse_req *fuse_request_alloc(void);
659
660struct fuse_req *fuse_request_alloc_nofs(void);
661
662/**
663 * Free a request
664 */
665void fuse_request_free(struct fuse_req *req);
666
667/**
668 * Get a request, may fail with -ENOMEM
669 */
670struct fuse_req *fuse_get_req(struct fuse_conn *fc);
671
672/**
673 * Gets a requests for a file operation, always succeeds
674 */
675struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file);
676
677/**
678 * Decrement reference count of a request. If count goes to zero free
679 * the request.
680 */
681void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
682
683/**
684 * Send a request (synchronous)
685 */
686void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
687
688/**
689 * Send a request in the background
690 */
691void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
692
693void fuse_request_send_background_locked(struct fuse_conn *fc,
694 struct fuse_req *req);
695
696/* Abort all requests */
697void fuse_abort_conn(struct fuse_conn *fc);
698
699/**
700 * Invalidate inode attributes
701 */
702void fuse_invalidate_attr(struct inode *inode);
703
704void fuse_invalidate_entry_cache(struct dentry *entry);
705
706/**
707 * Acquire reference to fuse_conn
708 */
709struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
710
711void fuse_conn_kill(struct fuse_conn *fc);
712
713/**
714 * Initialize fuse_conn
715 */
716void fuse_conn_init(struct fuse_conn *fc);
717
718/**
719 * Release reference to fuse_conn
720 */
721void fuse_conn_put(struct fuse_conn *fc);
722
723/**
724 * Add connection to control filesystem
725 */
726int fuse_ctl_add_conn(struct fuse_conn *fc);
727
728/**
729 * Remove connection from control filesystem
730 */
731void fuse_ctl_remove_conn(struct fuse_conn *fc);
732
733/**
734 * Is file type valid?
735 */
736int fuse_valid_type(int m);
737
738/**
739 * Is task allowed to perform filesystem operation?
740 */
741int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task);
742
743u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
744
745int fuse_update_attributes(struct inode *inode, struct kstat *stat,
746 struct file *file, bool *refreshed);
747
748void fuse_flush_writepages(struct inode *inode);
749
750void fuse_set_nowrite(struct inode *inode);
751void fuse_release_nowrite(struct inode *inode);
752
753u64 fuse_get_attr_version(struct fuse_conn *fc);
754
755/**
756 * File-system tells the kernel to invalidate cache for the given node id.
757 */
758int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
759 loff_t offset, loff_t len);
760
761/**
762 * File-system tells the kernel to invalidate parent attributes and
763 * the dentry matching parent/name.
764 *
765 * If the child_nodeid is non-zero and:
766 * - matches the inode number for the dentry matching parent/name,
767 * - is not a mount point
768 * - is a file or oan empty directory
769 * then the dentry is unhashed (d_delete()).
770 */
771int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
772 u64 child_nodeid, struct qstr *name);
773
774int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
775 bool isdir);
776ssize_t fuse_direct_io(struct file *file, const char __user *buf,
777 size_t count, loff_t *ppos, int write);
778long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
779 unsigned int flags);
780long fuse_ioctl_common(struct file *file, unsigned int cmd,
781 unsigned long arg, unsigned int flags);
782unsigned fuse_file_poll(struct file *file, poll_table *wait);
783int fuse_dev_release(struct inode *inode, struct file *file);
784
785void fuse_write_update_size(struct inode *inode, loff_t pos);
786
787#endif /* _FS_FUSE_I_H */
1/*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
4
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#ifndef _FS_FUSE_I_H
10#define _FS_FUSE_I_H
11
12#include <linux/fuse.h>
13#include <linux/fs.h>
14#include <linux/mount.h>
15#include <linux/wait.h>
16#include <linux/list.h>
17#include <linux/spinlock.h>
18#include <linux/mm.h>
19#include <linux/backing-dev.h>
20#include <linux/mutex.h>
21#include <linux/rwsem.h>
22#include <linux/rbtree.h>
23#include <linux/poll.h>
24#include <linux/workqueue.h>
25#include <linux/kref.h>
26
27/** Max number of pages that can be used in a single read request */
28#define FUSE_MAX_PAGES_PER_REQ 32
29
30/** Bias for fi->writectr, meaning new writepages must not be sent */
31#define FUSE_NOWRITE INT_MIN
32
33/** It could be as large as PATH_MAX, but would that have any uses? */
34#define FUSE_NAME_MAX 1024
35
36/** Number of dentries for each connection in the control filesystem */
37#define FUSE_CTL_NUM_DENTRIES 5
38
39/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
40 module will check permissions based on the file mode. Otherwise no
41 permission checking is done in the kernel */
42#define FUSE_DEFAULT_PERMISSIONS (1 << 0)
43
44/** If the FUSE_ALLOW_OTHER flag is given, then not only the user
45 doing the mount will be allowed to access the filesystem */
46#define FUSE_ALLOW_OTHER (1 << 1)
47
48/** Number of page pointers embedded in fuse_req */
49#define FUSE_REQ_INLINE_PAGES 1
50
51/** List of active connections */
52extern struct list_head fuse_conn_list;
53
54/** Global mutex protecting fuse_conn_list and the control filesystem */
55extern struct mutex fuse_mutex;
56
57/** Module parameters */
58extern unsigned max_user_bgreq;
59extern unsigned max_user_congthresh;
60
61/* One forget request */
62struct fuse_forget_link {
63 struct fuse_forget_one forget_one;
64 struct fuse_forget_link *next;
65};
66
67/** FUSE inode */
68struct fuse_inode {
69 /** Inode data */
70 struct inode inode;
71
72 /** Unique ID, which identifies the inode between userspace
73 * and kernel */
74 u64 nodeid;
75
76 /** Number of lookups on this inode */
77 u64 nlookup;
78
79 /** The request used for sending the FORGET message */
80 struct fuse_forget_link *forget;
81
82 /** Time in jiffies until the file attributes are valid */
83 u64 i_time;
84
85 /** The sticky bit in inode->i_mode may have been removed, so
86 preserve the original mode */
87 umode_t orig_i_mode;
88
89 /** 64 bit inode number */
90 u64 orig_ino;
91
92 /** Version of last attribute change */
93 u64 attr_version;
94
95 /** Files usable in writepage. Protected by fc->lock */
96 struct list_head write_files;
97
98 /** Writepages pending on truncate or fsync */
99 struct list_head queued_writes;
100
101 /** Number of sent writes, a negative bias (FUSE_NOWRITE)
102 * means more writes are blocked */
103 int writectr;
104
105 /** Waitq for writepage completion */
106 wait_queue_head_t page_waitq;
107
108 /** List of writepage requestst (pending or sent) */
109 struct list_head writepages;
110
111 /** Miscellaneous bits describing inode state */
112 unsigned long state;
113};
114
115/** FUSE inode state bits */
116enum {
117 /** Advise readdirplus */
118 FUSE_I_ADVISE_RDPLUS,
119 /** Initialized with readdirplus */
120 FUSE_I_INIT_RDPLUS,
121 /** An operation changing file size is in progress */
122 FUSE_I_SIZE_UNSTABLE,
123};
124
125struct fuse_conn;
126
127/** FUSE specific file data */
128struct fuse_file {
129 /** Fuse connection for this file */
130 struct fuse_conn *fc;
131
132 /** Request reserved for flush and release */
133 struct fuse_req *reserved_req;
134
135 /** Kernel file handle guaranteed to be unique */
136 u64 kh;
137
138 /** File handle used by userspace */
139 u64 fh;
140
141 /** Node id of this file */
142 u64 nodeid;
143
144 /** Refcount */
145 atomic_t count;
146
147 /** FOPEN_* flags returned by open */
148 u32 open_flags;
149
150 /** Entry on inode's write_files list */
151 struct list_head write_entry;
152
153 /** RB node to be linked on fuse_conn->polled_files */
154 struct rb_node polled_node;
155
156 /** Wait queue head for poll */
157 wait_queue_head_t poll_wait;
158
159 /** Has flock been performed on this file? */
160 bool flock:1;
161};
162
163/** One input argument of a request */
164struct fuse_in_arg {
165 unsigned size;
166 const void *value;
167};
168
169/** The request input */
170struct fuse_in {
171 /** The request header */
172 struct fuse_in_header h;
173
174 /** True if the data for the last argument is in req->pages */
175 unsigned argpages:1;
176
177 /** Number of arguments */
178 unsigned numargs;
179
180 /** Array of arguments */
181 struct fuse_in_arg args[3];
182};
183
184/** One output argument of a request */
185struct fuse_arg {
186 unsigned size;
187 void *value;
188};
189
190/** The request output */
191struct fuse_out {
192 /** Header returned from userspace */
193 struct fuse_out_header h;
194
195 /*
196 * The following bitfields are not changed during the request
197 * processing
198 */
199
200 /** Last argument is variable length (can be shorter than
201 arg->size) */
202 unsigned argvar:1;
203
204 /** Last argument is a list of pages to copy data to */
205 unsigned argpages:1;
206
207 /** Zero partially or not copied pages */
208 unsigned page_zeroing:1;
209
210 /** Pages may be replaced with new ones */
211 unsigned page_replace:1;
212
213 /** Number or arguments */
214 unsigned numargs;
215
216 /** Array of arguments */
217 struct fuse_arg args[2];
218};
219
220/** FUSE page descriptor */
221struct fuse_page_desc {
222 unsigned int length;
223 unsigned int offset;
224};
225
226struct fuse_args {
227 struct {
228 struct {
229 uint32_t opcode;
230 uint64_t nodeid;
231 } h;
232 unsigned numargs;
233 struct fuse_in_arg args[3];
234
235 } in;
236 struct {
237 unsigned argvar:1;
238 unsigned numargs;
239 struct fuse_arg args[2];
240 } out;
241};
242
243#define FUSE_ARGS(args) struct fuse_args args = {}
244
245/** The request IO state (for asynchronous processing) */
246struct fuse_io_priv {
247 struct kref refcnt;
248 int async;
249 spinlock_t lock;
250 unsigned reqs;
251 ssize_t bytes;
252 size_t size;
253 __u64 offset;
254 bool write;
255 int err;
256 struct kiocb *iocb;
257 struct file *file;
258 struct completion *done;
259};
260
261#define FUSE_IO_PRIV_SYNC(f) \
262{ \
263 .refcnt = { ATOMIC_INIT(1) }, \
264 .async = 0, \
265 .file = f, \
266}
267
268/**
269 * Request flags
270 *
271 * FR_ISREPLY: set if the request has reply
272 * FR_FORCE: force sending of the request even if interrupted
273 * FR_BACKGROUND: request is sent in the background
274 * FR_WAITING: request is counted as "waiting"
275 * FR_ABORTED: the request was aborted
276 * FR_INTERRUPTED: the request has been interrupted
277 * FR_LOCKED: data is being copied to/from the request
278 * FR_PENDING: request is not yet in userspace
279 * FR_SENT: request is in userspace, waiting for an answer
280 * FR_FINISHED: request is finished
281 * FR_PRIVATE: request is on private list
282 */
283enum fuse_req_flag {
284 FR_ISREPLY,
285 FR_FORCE,
286 FR_BACKGROUND,
287 FR_WAITING,
288 FR_ABORTED,
289 FR_INTERRUPTED,
290 FR_LOCKED,
291 FR_PENDING,
292 FR_SENT,
293 FR_FINISHED,
294 FR_PRIVATE,
295};
296
297/**
298 * A request to the client
299 *
300 * .waitq.lock protects the following fields:
301 * - FR_ABORTED
302 * - FR_LOCKED (may also be modified under fc->lock, tested under both)
303 */
304struct fuse_req {
305 /** This can be on either pending processing or io lists in
306 fuse_conn */
307 struct list_head list;
308
309 /** Entry on the interrupts list */
310 struct list_head intr_entry;
311
312 /** refcount */
313 atomic_t count;
314
315 /** Unique ID for the interrupt request */
316 u64 intr_unique;
317
318 /* Request flags, updated with test/set/clear_bit() */
319 unsigned long flags;
320
321 /** The request input */
322 struct fuse_in in;
323
324 /** The request output */
325 struct fuse_out out;
326
327 /** Used to wake up the task waiting for completion of request*/
328 wait_queue_head_t waitq;
329
330 /** Data for asynchronous requests */
331 union {
332 struct {
333 struct fuse_release_in in;
334 struct inode *inode;
335 } release;
336 struct fuse_init_in init_in;
337 struct fuse_init_out init_out;
338 struct cuse_init_in cuse_init_in;
339 struct {
340 struct fuse_read_in in;
341 u64 attr_ver;
342 } read;
343 struct {
344 struct fuse_write_in in;
345 struct fuse_write_out out;
346 struct fuse_req *next;
347 } write;
348 struct fuse_notify_retrieve_in retrieve_in;
349 } misc;
350
351 /** page vector */
352 struct page **pages;
353
354 /** page-descriptor vector */
355 struct fuse_page_desc *page_descs;
356
357 /** size of the 'pages' array */
358 unsigned max_pages;
359
360 /** inline page vector */
361 struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
362
363 /** inline page-descriptor vector */
364 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
365
366 /** number of pages in vector */
367 unsigned num_pages;
368
369 /** File used in the request (or NULL) */
370 struct fuse_file *ff;
371
372 /** Inode used in the request or NULL */
373 struct inode *inode;
374
375 /** AIO control block */
376 struct fuse_io_priv *io;
377
378 /** Link on fi->writepages */
379 struct list_head writepages_entry;
380
381 /** Request completion callback */
382 void (*end)(struct fuse_conn *, struct fuse_req *);
383
384 /** Request is stolen from fuse_file->reserved_req */
385 struct file *stolen_file;
386};
387
388struct fuse_iqueue {
389 /** Connection established */
390 unsigned connected;
391
392 /** Readers of the connection are waiting on this */
393 wait_queue_head_t waitq;
394
395 /** The next unique request id */
396 u64 reqctr;
397
398 /** The list of pending requests */
399 struct list_head pending;
400
401 /** Pending interrupts */
402 struct list_head interrupts;
403
404 /** Queue of pending forgets */
405 struct fuse_forget_link forget_list_head;
406 struct fuse_forget_link *forget_list_tail;
407
408 /** Batching of FORGET requests (positive indicates FORGET batch) */
409 int forget_batch;
410
411 /** O_ASYNC requests */
412 struct fasync_struct *fasync;
413};
414
415struct fuse_pqueue {
416 /** Connection established */
417 unsigned connected;
418
419 /** Lock protecting accessess to members of this structure */
420 spinlock_t lock;
421
422 /** The list of requests being processed */
423 struct list_head processing;
424
425 /** The list of requests under I/O */
426 struct list_head io;
427};
428
429/**
430 * Fuse device instance
431 */
432struct fuse_dev {
433 /** Fuse connection for this device */
434 struct fuse_conn *fc;
435
436 /** Processing queue */
437 struct fuse_pqueue pq;
438
439 /** list entry on fc->devices */
440 struct list_head entry;
441};
442
443/**
444 * A Fuse connection.
445 *
446 * This structure is created, when the filesystem is mounted, and is
447 * destroyed, when the client device is closed and the filesystem is
448 * unmounted.
449 */
450struct fuse_conn {
451 /** Lock protecting accessess to members of this structure */
452 spinlock_t lock;
453
454 /** Refcount */
455 atomic_t count;
456
457 /** Number of fuse_dev's */
458 atomic_t dev_count;
459
460 struct rcu_head rcu;
461
462 /** The user id for this mount */
463 kuid_t user_id;
464
465 /** The group id for this mount */
466 kgid_t group_id;
467
468 /** The fuse mount flags for this mount */
469 unsigned flags;
470
471 /** Maximum read size */
472 unsigned max_read;
473
474 /** Maximum write size */
475 unsigned max_write;
476
477 /** Input queue */
478 struct fuse_iqueue iq;
479
480 /** The next unique kernel file handle */
481 u64 khctr;
482
483 /** rbtree of fuse_files waiting for poll events indexed by ph */
484 struct rb_root polled_files;
485
486 /** Maximum number of outstanding background requests */
487 unsigned max_background;
488
489 /** Number of background requests at which congestion starts */
490 unsigned congestion_threshold;
491
492 /** Number of requests currently in the background */
493 unsigned num_background;
494
495 /** Number of background requests currently queued for userspace */
496 unsigned active_background;
497
498 /** The list of background requests set aside for later queuing */
499 struct list_head bg_queue;
500
501 /** Flag indicating that INIT reply has been received. Allocating
502 * any fuse request will be suspended until the flag is set */
503 int initialized;
504
505 /** Flag indicating if connection is blocked. This will be
506 the case before the INIT reply is received, and if there
507 are too many outstading backgrounds requests */
508 int blocked;
509
510 /** waitq for blocked connection */
511 wait_queue_head_t blocked_waitq;
512
513 /** waitq for reserved requests */
514 wait_queue_head_t reserved_req_waitq;
515
516 /** Connection established, cleared on umount, connection
517 abort and device release */
518 unsigned connected;
519
520 /** Connection failed (version mismatch). Cannot race with
521 setting other bitfields since it is only set once in INIT
522 reply, before any other request, and never cleared */
523 unsigned conn_error:1;
524
525 /** Connection successful. Only set in INIT */
526 unsigned conn_init:1;
527
528 /** Do readpages asynchronously? Only set in INIT */
529 unsigned async_read:1;
530
531 /** Do not send separate SETATTR request before open(O_TRUNC) */
532 unsigned atomic_o_trunc:1;
533
534 /** Filesystem supports NFS exporting. Only set in INIT */
535 unsigned export_support:1;
536
537 /** Set if bdi is valid */
538 unsigned bdi_initialized:1;
539
540 /** write-back cache policy (default is write-through) */
541 unsigned writeback_cache:1;
542
543 /*
544 * The following bitfields are only for optimization purposes
545 * and hence races in setting them will not cause malfunction
546 */
547
548 /** Is open/release not implemented by fs? */
549 unsigned no_open:1;
550
551 /** Is fsync not implemented by fs? */
552 unsigned no_fsync:1;
553
554 /** Is fsyncdir not implemented by fs? */
555 unsigned no_fsyncdir:1;
556
557 /** Is flush not implemented by fs? */
558 unsigned no_flush:1;
559
560 /** Is setxattr not implemented by fs? */
561 unsigned no_setxattr:1;
562
563 /** Is getxattr not implemented by fs? */
564 unsigned no_getxattr:1;
565
566 /** Is listxattr not implemented by fs? */
567 unsigned no_listxattr:1;
568
569 /** Is removexattr not implemented by fs? */
570 unsigned no_removexattr:1;
571
572 /** Are posix file locking primitives not implemented by fs? */
573 unsigned no_lock:1;
574
575 /** Is access not implemented by fs? */
576 unsigned no_access:1;
577
578 /** Is create not implemented by fs? */
579 unsigned no_create:1;
580
581 /** Is interrupt not implemented by fs? */
582 unsigned no_interrupt:1;
583
584 /** Is bmap not implemented by fs? */
585 unsigned no_bmap:1;
586
587 /** Is poll not implemented by fs? */
588 unsigned no_poll:1;
589
590 /** Do multi-page cached writes */
591 unsigned big_writes:1;
592
593 /** Don't apply umask to creation modes */
594 unsigned dont_mask:1;
595
596 /** Are BSD file locking primitives not implemented by fs? */
597 unsigned no_flock:1;
598
599 /** Is fallocate not implemented by fs? */
600 unsigned no_fallocate:1;
601
602 /** Is rename with flags implemented by fs? */
603 unsigned no_rename2:1;
604
605 /** Use enhanced/automatic page cache invalidation. */
606 unsigned auto_inval_data:1;
607
608 /** Does the filesystem support readdirplus? */
609 unsigned do_readdirplus:1;
610
611 /** Does the filesystem want adaptive readdirplus? */
612 unsigned readdirplus_auto:1;
613
614 /** Does the filesystem support asynchronous direct-IO submission? */
615 unsigned async_dio:1;
616
617 /** Is lseek not implemented by fs? */
618 unsigned no_lseek:1;
619
620 /** The number of requests waiting for completion */
621 atomic_t num_waiting;
622
623 /** Negotiated minor version */
624 unsigned minor;
625
626 /** Backing dev info */
627 struct backing_dev_info bdi;
628
629 /** Entry on the fuse_conn_list */
630 struct list_head entry;
631
632 /** Device ID from super block */
633 dev_t dev;
634
635 /** Dentries in the control filesystem */
636 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
637
638 /** number of dentries used in the above array */
639 int ctl_ndents;
640
641 /** Key for lock owner ID scrambling */
642 u32 scramble_key[4];
643
644 /** Reserved request for the DESTROY message */
645 struct fuse_req *destroy_req;
646
647 /** Version counter for attribute changes */
648 u64 attr_version;
649
650 /** Called on final put */
651 void (*release)(struct fuse_conn *);
652
653 /** Super block for this connection. */
654 struct super_block *sb;
655
656 /** Read/write semaphore to hold when accessing sb. */
657 struct rw_semaphore killsb;
658
659 /** List of device instances belonging to this connection */
660 struct list_head devices;
661};
662
663static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
664{
665 return sb->s_fs_info;
666}
667
668static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
669{
670 return get_fuse_conn_super(inode->i_sb);
671}
672
673static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
674{
675 return container_of(inode, struct fuse_inode, inode);
676}
677
678static inline u64 get_node_id(struct inode *inode)
679{
680 return get_fuse_inode(inode)->nodeid;
681}
682
683/** Device operations */
684extern const struct file_operations fuse_dev_operations;
685
686extern const struct dentry_operations fuse_dentry_operations;
687
688/**
689 * Inode to nodeid comparison.
690 */
691int fuse_inode_eq(struct inode *inode, void *_nodeidp);
692
693/**
694 * Get a filled in inode
695 */
696struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
697 int generation, struct fuse_attr *attr,
698 u64 attr_valid, u64 attr_version);
699
700int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
701 struct fuse_entry_out *outarg, struct inode **inode);
702
703/**
704 * Send FORGET command
705 */
706void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
707 u64 nodeid, u64 nlookup);
708
709struct fuse_forget_link *fuse_alloc_forget(void);
710
711/* Used by READDIRPLUS */
712void fuse_force_forget(struct file *file, u64 nodeid);
713
714/**
715 * Initialize READ or READDIR request
716 */
717void fuse_read_fill(struct fuse_req *req, struct file *file,
718 loff_t pos, size_t count, int opcode);
719
720/**
721 * Send OPEN or OPENDIR request
722 */
723int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
724
725struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
726struct fuse_file *fuse_file_get(struct fuse_file *ff);
727void fuse_file_free(struct fuse_file *ff);
728void fuse_finish_open(struct inode *inode, struct file *file);
729
730void fuse_sync_release(struct fuse_file *ff, int flags);
731
732/**
733 * Send RELEASE or RELEASEDIR request
734 */
735void fuse_release_common(struct file *file, int opcode);
736
737/**
738 * Send FSYNC or FSYNCDIR request
739 */
740int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
741 int datasync, int isdir);
742
743/**
744 * Notify poll wakeup
745 */
746int fuse_notify_poll_wakeup(struct fuse_conn *fc,
747 struct fuse_notify_poll_wakeup_out *outarg);
748
749/**
750 * Initialize file operations on a regular file
751 */
752void fuse_init_file_inode(struct inode *inode);
753
754/**
755 * Initialize inode operations on regular files and special files
756 */
757void fuse_init_common(struct inode *inode);
758
759/**
760 * Initialize inode and file operations on a directory
761 */
762void fuse_init_dir(struct inode *inode);
763
764/**
765 * Initialize inode operations on a symlink
766 */
767void fuse_init_symlink(struct inode *inode);
768
769/**
770 * Change attributes of an inode
771 */
772void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
773 u64 attr_valid, u64 attr_version);
774
775void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
776 u64 attr_valid);
777
778/**
779 * Initialize the client device
780 */
781int fuse_dev_init(void);
782
783/**
784 * Cleanup the client device
785 */
786void fuse_dev_cleanup(void);
787
788int fuse_ctl_init(void);
789void __exit fuse_ctl_cleanup(void);
790
791/**
792 * Allocate a request
793 */
794struct fuse_req *fuse_request_alloc(unsigned npages);
795
796struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
797
798/**
799 * Free a request
800 */
801void fuse_request_free(struct fuse_req *req);
802
803/**
804 * Get a request, may fail with -ENOMEM,
805 * caller should specify # elements in req->pages[] explicitly
806 */
807struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
808struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
809 unsigned npages);
810
811/*
812 * Increment reference count on request
813 */
814void __fuse_get_request(struct fuse_req *req);
815
816/**
817 * Gets a requests for a file operation, always succeeds
818 */
819struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
820 struct file *file);
821
822/**
823 * Decrement reference count of a request. If count goes to zero free
824 * the request.
825 */
826void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
827
828/**
829 * Send a request (synchronous)
830 */
831void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
832
833/**
834 * Simple request sending that does request allocation and freeing
835 */
836ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
837
838/**
839 * Send a request in the background
840 */
841void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
842
843void fuse_request_send_background_locked(struct fuse_conn *fc,
844 struct fuse_req *req);
845
846/* Abort all requests */
847void fuse_abort_conn(struct fuse_conn *fc);
848
849/**
850 * Invalidate inode attributes
851 */
852void fuse_invalidate_attr(struct inode *inode);
853
854void fuse_invalidate_entry_cache(struct dentry *entry);
855
856void fuse_invalidate_atime(struct inode *inode);
857
858/**
859 * Acquire reference to fuse_conn
860 */
861struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
862
863/**
864 * Initialize fuse_conn
865 */
866void fuse_conn_init(struct fuse_conn *fc);
867
868/**
869 * Release reference to fuse_conn
870 */
871void fuse_conn_put(struct fuse_conn *fc);
872
873struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc);
874void fuse_dev_free(struct fuse_dev *fud);
875
876/**
877 * Add connection to control filesystem
878 */
879int fuse_ctl_add_conn(struct fuse_conn *fc);
880
881/**
882 * Remove connection from control filesystem
883 */
884void fuse_ctl_remove_conn(struct fuse_conn *fc);
885
886/**
887 * Is file type valid?
888 */
889int fuse_valid_type(int m);
890
891/**
892 * Is current process allowed to perform filesystem operation?
893 */
894int fuse_allow_current_process(struct fuse_conn *fc);
895
896u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
897
898int fuse_update_attributes(struct inode *inode, struct kstat *stat,
899 struct file *file, bool *refreshed);
900
901void fuse_flush_writepages(struct inode *inode);
902
903void fuse_set_nowrite(struct inode *inode);
904void fuse_release_nowrite(struct inode *inode);
905
906u64 fuse_get_attr_version(struct fuse_conn *fc);
907
908/**
909 * File-system tells the kernel to invalidate cache for the given node id.
910 */
911int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
912 loff_t offset, loff_t len);
913
914/**
915 * File-system tells the kernel to invalidate parent attributes and
916 * the dentry matching parent/name.
917 *
918 * If the child_nodeid is non-zero and:
919 * - matches the inode number for the dentry matching parent/name,
920 * - is not a mount point
921 * - is a file or oan empty directory
922 * then the dentry is unhashed (d_delete()).
923 */
924int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
925 u64 child_nodeid, struct qstr *name);
926
927int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
928 bool isdir);
929
930/**
931 * fuse_direct_io() flags
932 */
933
934/** If set, it is WRITE; otherwise - READ */
935#define FUSE_DIO_WRITE (1 << 0)
936
937/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
938#define FUSE_DIO_CUSE (1 << 1)
939
940ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
941 loff_t *ppos, int flags);
942long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
943 unsigned int flags);
944long fuse_ioctl_common(struct file *file, unsigned int cmd,
945 unsigned long arg, unsigned int flags);
946unsigned fuse_file_poll(struct file *file, poll_table *wait);
947int fuse_dev_release(struct inode *inode, struct file *file);
948
949bool fuse_write_update_size(struct inode *inode, loff_t pos);
950
951int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
952int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
953
954int fuse_do_setattr(struct inode *inode, struct iattr *attr,
955 struct file *file);
956
957void fuse_set_initialized(struct fuse_conn *fc);
958
959#endif /* _FS_FUSE_I_H */