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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#include <linux/xattr.h>
27#include <linux/pid_namespace.h>
28#include <linux/refcount.h>
29
30/** Max number of pages that can be used in a single read request */
31#define FUSE_MAX_PAGES_PER_REQ 32
32
33/** Bias for fi->writectr, meaning new writepages must not be sent */
34#define FUSE_NOWRITE INT_MIN
35
36/** It could be as large as PATH_MAX, but would that have any uses? */
37#define FUSE_NAME_MAX 1024
38
39/** Number of dentries for each connection in the control filesystem */
40#define FUSE_CTL_NUM_DENTRIES 5
41
42/** Number of page pointers embedded in fuse_req */
43#define FUSE_REQ_INLINE_PAGES 1
44
45/** List of active connections */
46extern struct list_head fuse_conn_list;
47
48/** Global mutex protecting fuse_conn_list and the control filesystem */
49extern struct mutex fuse_mutex;
50
51/** Module parameters */
52extern unsigned max_user_bgreq;
53extern unsigned max_user_congthresh;
54
55/* One forget request */
56struct fuse_forget_link {
57 struct fuse_forget_one forget_one;
58 struct fuse_forget_link *next;
59};
60
61/** FUSE inode */
62struct fuse_inode {
63 /** Inode data */
64 struct inode inode;
65
66 /** Unique ID, which identifies the inode between userspace
67 * and kernel */
68 u64 nodeid;
69
70 /** Number of lookups on this inode */
71 u64 nlookup;
72
73 /** The request used for sending the FORGET message */
74 struct fuse_forget_link *forget;
75
76 /** Time in jiffies until the file attributes are valid */
77 u64 i_time;
78
79 /** The sticky bit in inode->i_mode may have been removed, so
80 preserve the original mode */
81 umode_t orig_i_mode;
82
83 /** 64 bit inode number */
84 u64 orig_ino;
85
86 /** Version of last attribute change */
87 u64 attr_version;
88
89 /** Files usable in writepage. Protected by fc->lock */
90 struct list_head write_files;
91
92 /** Writepages pending on truncate or fsync */
93 struct list_head queued_writes;
94
95 /** Number of sent writes, a negative bias (FUSE_NOWRITE)
96 * means more writes are blocked */
97 int writectr;
98
99 /** Waitq for writepage completion */
100 wait_queue_head_t page_waitq;
101
102 /** List of writepage requestst (pending or sent) */
103 struct list_head writepages;
104
105 /** Miscellaneous bits describing inode state */
106 unsigned long state;
107
108 /** Lock for serializing lookup and readdir for back compatibility*/
109 struct mutex mutex;
110};
111
112/** FUSE inode state bits */
113enum {
114 /** Advise readdirplus */
115 FUSE_I_ADVISE_RDPLUS,
116 /** Initialized with readdirplus */
117 FUSE_I_INIT_RDPLUS,
118 /** An operation changing file size is in progress */
119 FUSE_I_SIZE_UNSTABLE,
120};
121
122struct fuse_conn;
123
124/** FUSE specific file data */
125struct fuse_file {
126 /** Fuse connection for this file */
127 struct fuse_conn *fc;
128
129 /** Request reserved for flush and release */
130 struct fuse_req *reserved_req;
131
132 /** Kernel file handle guaranteed to be unique */
133 u64 kh;
134
135 /** File handle used by userspace */
136 u64 fh;
137
138 /** Node id of this file */
139 u64 nodeid;
140
141 /** Refcount */
142 refcount_t count;
143
144 /** FOPEN_* flags returned by open */
145 u32 open_flags;
146
147 /** Entry on inode's write_files list */
148 struct list_head write_entry;
149
150 /** RB node to be linked on fuse_conn->polled_files */
151 struct rb_node polled_node;
152
153 /** Wait queue head for poll */
154 wait_queue_head_t poll_wait;
155
156 /** Has flock been performed on this file? */
157 bool flock:1;
158};
159
160/** One input argument of a request */
161struct fuse_in_arg {
162 unsigned size;
163 const void *value;
164};
165
166/** The request input */
167struct fuse_in {
168 /** The request header */
169 struct fuse_in_header h;
170
171 /** True if the data for the last argument is in req->pages */
172 unsigned argpages:1;
173
174 /** Number of arguments */
175 unsigned numargs;
176
177 /** Array of arguments */
178 struct fuse_in_arg args[3];
179};
180
181/** One output argument of a request */
182struct fuse_arg {
183 unsigned size;
184 void *value;
185};
186
187/** The request output */
188struct fuse_out {
189 /** Header returned from userspace */
190 struct fuse_out_header h;
191
192 /*
193 * The following bitfields are not changed during the request
194 * processing
195 */
196
197 /** Last argument is variable length (can be shorter than
198 arg->size) */
199 unsigned argvar:1;
200
201 /** Last argument is a list of pages to copy data to */
202 unsigned argpages:1;
203
204 /** Zero partially or not copied pages */
205 unsigned page_zeroing:1;
206
207 /** Pages may be replaced with new ones */
208 unsigned page_replace:1;
209
210 /** Number or arguments */
211 unsigned numargs;
212
213 /** Array of arguments */
214 struct fuse_arg args[2];
215};
216
217/** FUSE page descriptor */
218struct fuse_page_desc {
219 unsigned int length;
220 unsigned int offset;
221};
222
223struct fuse_args {
224 struct {
225 struct {
226 uint32_t opcode;
227 uint64_t nodeid;
228 } h;
229 unsigned numargs;
230 struct fuse_in_arg args[3];
231
232 } in;
233 struct {
234 unsigned argvar:1;
235 unsigned numargs;
236 struct fuse_arg args[2];
237 } out;
238};
239
240#define FUSE_ARGS(args) struct fuse_args args = {}
241
242/** The request IO state (for asynchronous processing) */
243struct fuse_io_priv {
244 struct kref refcnt;
245 int async;
246 spinlock_t lock;
247 unsigned reqs;
248 ssize_t bytes;
249 size_t size;
250 __u64 offset;
251 bool write;
252 bool should_dirty;
253 int err;
254 struct kiocb *iocb;
255 struct completion *done;
256 bool blocking;
257};
258
259#define FUSE_IO_PRIV_SYNC(i) \
260{ \
261 .refcnt = KREF_INIT(1), \
262 .async = 0, \
263 .iocb = i, \
264}
265
266/**
267 * Request flags
268 *
269 * FR_ISREPLY: set if the request has reply
270 * FR_FORCE: force sending of the request even if interrupted
271 * FR_BACKGROUND: request is sent in the background
272 * FR_WAITING: request is counted as "waiting"
273 * FR_ABORTED: the request was aborted
274 * FR_INTERRUPTED: the request has been interrupted
275 * FR_LOCKED: data is being copied to/from the request
276 * FR_PENDING: request is not yet in userspace
277 * FR_SENT: request is in userspace, waiting for an answer
278 * FR_FINISHED: request is finished
279 * FR_PRIVATE: request is on private list
280 */
281enum fuse_req_flag {
282 FR_ISREPLY,
283 FR_FORCE,
284 FR_BACKGROUND,
285 FR_WAITING,
286 FR_ABORTED,
287 FR_INTERRUPTED,
288 FR_LOCKED,
289 FR_PENDING,
290 FR_SENT,
291 FR_FINISHED,
292 FR_PRIVATE,
293};
294
295/**
296 * A request to the client
297 *
298 * .waitq.lock protects the following fields:
299 * - FR_ABORTED
300 * - FR_LOCKED (may also be modified under fc->lock, tested under both)
301 */
302struct fuse_req {
303 /** This can be on either pending processing or io lists in
304 fuse_conn */
305 struct list_head list;
306
307 /** Entry on the interrupts list */
308 struct list_head intr_entry;
309
310 /** refcount */
311 refcount_t count;
312
313 /** Unique ID for the interrupt request */
314 u64 intr_unique;
315
316 /* Request flags, updated with test/set/clear_bit() */
317 unsigned long flags;
318
319 /** The request input */
320 struct fuse_in in;
321
322 /** The request output */
323 struct fuse_out out;
324
325 /** Used to wake up the task waiting for completion of request*/
326 wait_queue_head_t waitq;
327
328 /** Data for asynchronous requests */
329 union {
330 struct {
331 struct fuse_release_in in;
332 struct inode *inode;
333 } release;
334 struct fuse_init_in init_in;
335 struct fuse_init_out init_out;
336 struct cuse_init_in cuse_init_in;
337 struct {
338 struct fuse_read_in in;
339 u64 attr_ver;
340 } read;
341 struct {
342 struct fuse_write_in in;
343 struct fuse_write_out out;
344 struct fuse_req *next;
345 } write;
346 struct fuse_notify_retrieve_in retrieve_in;
347 } misc;
348
349 /** page vector */
350 struct page **pages;
351
352 /** page-descriptor vector */
353 struct fuse_page_desc *page_descs;
354
355 /** size of the 'pages' array */
356 unsigned max_pages;
357
358 /** inline page vector */
359 struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
360
361 /** inline page-descriptor vector */
362 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
363
364 /** number of pages in vector */
365 unsigned num_pages;
366
367 /** File used in the request (or NULL) */
368 struct fuse_file *ff;
369
370 /** Inode used in the request or NULL */
371 struct inode *inode;
372
373 /** AIO control block */
374 struct fuse_io_priv *io;
375
376 /** Link on fi->writepages */
377 struct list_head writepages_entry;
378
379 /** Request completion callback */
380 void (*end)(struct fuse_conn *, struct fuse_req *);
381
382 /** Request is stolen from fuse_file->reserved_req */
383 struct file *stolen_file;
384};
385
386struct fuse_iqueue {
387 /** Connection established */
388 unsigned connected;
389
390 /** Readers of the connection are waiting on this */
391 wait_queue_head_t waitq;
392
393 /** The next unique request id */
394 u64 reqctr;
395
396 /** The list of pending requests */
397 struct list_head pending;
398
399 /** Pending interrupts */
400 struct list_head interrupts;
401
402 /** Queue of pending forgets */
403 struct fuse_forget_link forget_list_head;
404 struct fuse_forget_link *forget_list_tail;
405
406 /** Batching of FORGET requests (positive indicates FORGET batch) */
407 int forget_batch;
408
409 /** O_ASYNC requests */
410 struct fasync_struct *fasync;
411};
412
413struct fuse_pqueue {
414 /** Connection established */
415 unsigned connected;
416
417 /** Lock protecting accessess to members of this structure */
418 spinlock_t lock;
419
420 /** The list of requests being processed */
421 struct list_head processing;
422
423 /** The list of requests under I/O */
424 struct list_head io;
425};
426
427/**
428 * Fuse device instance
429 */
430struct fuse_dev {
431 /** Fuse connection for this device */
432 struct fuse_conn *fc;
433
434 /** Processing queue */
435 struct fuse_pqueue pq;
436
437 /** list entry on fc->devices */
438 struct list_head entry;
439};
440
441/**
442 * A Fuse connection.
443 *
444 * This structure is created, when the filesystem is mounted, and is
445 * destroyed, when the client device is closed and the filesystem is
446 * unmounted.
447 */
448struct fuse_conn {
449 /** Lock protecting accessess to members of this structure */
450 spinlock_t lock;
451
452 /** Refcount */
453 refcount_t count;
454
455 /** Number of fuse_dev's */
456 atomic_t dev_count;
457
458 struct rcu_head rcu;
459
460 /** The user id for this mount */
461 kuid_t user_id;
462
463 /** The group id for this mount */
464 kgid_t group_id;
465
466 /** The pid namespace for this mount */
467 struct pid_namespace *pid_ns;
468
469 /** Maximum read size */
470 unsigned max_read;
471
472 /** Maximum write size */
473 unsigned max_write;
474
475 /** Input queue */
476 struct fuse_iqueue iq;
477
478 /** The next unique kernel file handle */
479 u64 khctr;
480
481 /** rbtree of fuse_files waiting for poll events indexed by ph */
482 struct rb_root polled_files;
483
484 /** Maximum number of outstanding background requests */
485 unsigned max_background;
486
487 /** Number of background requests at which congestion starts */
488 unsigned congestion_threshold;
489
490 /** Number of requests currently in the background */
491 unsigned num_background;
492
493 /** Number of background requests currently queued for userspace */
494 unsigned active_background;
495
496 /** The list of background requests set aside for later queuing */
497 struct list_head bg_queue;
498
499 /** Flag indicating that INIT reply has been received. Allocating
500 * any fuse request will be suspended until the flag is set */
501 int initialized;
502
503 /** Flag indicating if connection is blocked. This will be
504 the case before the INIT reply is received, and if there
505 are too many outstading backgrounds requests */
506 int blocked;
507
508 /** waitq for blocked connection */
509 wait_queue_head_t blocked_waitq;
510
511 /** waitq for reserved requests */
512 wait_queue_head_t reserved_req_waitq;
513
514 /** Connection established, cleared on umount, connection
515 abort and device release */
516 unsigned connected;
517
518 /** Connection failed (version mismatch). Cannot race with
519 setting other bitfields since it is only set once in INIT
520 reply, before any other request, and never cleared */
521 unsigned conn_error:1;
522
523 /** Connection successful. Only set in INIT */
524 unsigned conn_init:1;
525
526 /** Do readpages asynchronously? Only set in INIT */
527 unsigned async_read:1;
528
529 /** Do not send separate SETATTR request before open(O_TRUNC) */
530 unsigned atomic_o_trunc:1;
531
532 /** Filesystem supports NFS exporting. Only set in INIT */
533 unsigned export_support:1;
534
535 /** write-back cache policy (default is write-through) */
536 unsigned writeback_cache:1;
537
538 /** allow parallel lookups and readdir (default is serialized) */
539 unsigned parallel_dirops:1;
540
541 /** handle fs handles killing suid/sgid/cap on write/chown/trunc */
542 unsigned handle_killpriv:1;
543
544 /*
545 * The following bitfields are only for optimization purposes
546 * and hence races in setting them will not cause malfunction
547 */
548
549 /** Is open/release not implemented by fs? */
550 unsigned no_open:1;
551
552 /** Is fsync not implemented by fs? */
553 unsigned no_fsync:1;
554
555 /** Is fsyncdir not implemented by fs? */
556 unsigned no_fsyncdir:1;
557
558 /** Is flush not implemented by fs? */
559 unsigned no_flush:1;
560
561 /** Is setxattr not implemented by fs? */
562 unsigned no_setxattr:1;
563
564 /** Is getxattr not implemented by fs? */
565 unsigned no_getxattr:1;
566
567 /** Is listxattr not implemented by fs? */
568 unsigned no_listxattr:1;
569
570 /** Is removexattr not implemented by fs? */
571 unsigned no_removexattr:1;
572
573 /** Are posix file locking primitives not implemented by fs? */
574 unsigned no_lock:1;
575
576 /** Is access not implemented by fs? */
577 unsigned no_access:1;
578
579 /** Is create not implemented by fs? */
580 unsigned no_create:1;
581
582 /** Is interrupt not implemented by fs? */
583 unsigned no_interrupt:1;
584
585 /** Is bmap not implemented by fs? */
586 unsigned no_bmap:1;
587
588 /** Is poll not implemented by fs? */
589 unsigned no_poll:1;
590
591 /** Do multi-page cached writes */
592 unsigned big_writes:1;
593
594 /** Don't apply umask to creation modes */
595 unsigned dont_mask:1;
596
597 /** Are BSD file locking primitives not implemented by fs? */
598 unsigned no_flock:1;
599
600 /** Is fallocate not implemented by fs? */
601 unsigned no_fallocate:1;
602
603 /** Is rename with flags implemented by fs? */
604 unsigned no_rename2:1;
605
606 /** Use enhanced/automatic page cache invalidation. */
607 unsigned auto_inval_data:1;
608
609 /** Does the filesystem support readdirplus? */
610 unsigned do_readdirplus:1;
611
612 /** Does the filesystem want adaptive readdirplus? */
613 unsigned readdirplus_auto:1;
614
615 /** Does the filesystem support asynchronous direct-IO submission? */
616 unsigned async_dio:1;
617
618 /** Is lseek not implemented by fs? */
619 unsigned no_lseek:1;
620
621 /** Does the filesystem support posix acls? */
622 unsigned posix_acl:1;
623
624 /** Check permissions based on the file mode or not? */
625 unsigned default_permissions:1;
626
627 /** Allow other than the mounter user to access the filesystem ? */
628 unsigned allow_other:1;
629
630 /** The number of requests waiting for completion */
631 atomic_t num_waiting;
632
633 /** Negotiated minor version */
634 unsigned minor;
635
636 /** Entry on the fuse_conn_list */
637 struct list_head entry;
638
639 /** Device ID from super block */
640 dev_t dev;
641
642 /** Dentries in the control filesystem */
643 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
644
645 /** number of dentries used in the above array */
646 int ctl_ndents;
647
648 /** Key for lock owner ID scrambling */
649 u32 scramble_key[4];
650
651 /** Reserved request for the DESTROY message */
652 struct fuse_req *destroy_req;
653
654 /** Version counter for attribute changes */
655 u64 attr_version;
656
657 /** Called on final put */
658 void (*release)(struct fuse_conn *);
659
660 /** Super block for this connection. */
661 struct super_block *sb;
662
663 /** Read/write semaphore to hold when accessing sb. */
664 struct rw_semaphore killsb;
665
666 /** List of device instances belonging to this connection */
667 struct list_head devices;
668};
669
670static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
671{
672 return sb->s_fs_info;
673}
674
675static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
676{
677 return get_fuse_conn_super(inode->i_sb);
678}
679
680static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
681{
682 return container_of(inode, struct fuse_inode, inode);
683}
684
685static inline u64 get_node_id(struct inode *inode)
686{
687 return get_fuse_inode(inode)->nodeid;
688}
689
690/** Device operations */
691extern const struct file_operations fuse_dev_operations;
692
693extern const struct dentry_operations fuse_dentry_operations;
694extern const struct dentry_operations fuse_root_dentry_operations;
695
696/**
697 * Inode to nodeid comparison.
698 */
699int fuse_inode_eq(struct inode *inode, void *_nodeidp);
700
701/**
702 * Get a filled in inode
703 */
704struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
705 int generation, struct fuse_attr *attr,
706 u64 attr_valid, u64 attr_version);
707
708int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
709 struct fuse_entry_out *outarg, struct inode **inode);
710
711/**
712 * Send FORGET command
713 */
714void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
715 u64 nodeid, u64 nlookup);
716
717struct fuse_forget_link *fuse_alloc_forget(void);
718
719/* Used by READDIRPLUS */
720void fuse_force_forget(struct file *file, u64 nodeid);
721
722/**
723 * Initialize READ or READDIR request
724 */
725void fuse_read_fill(struct fuse_req *req, struct file *file,
726 loff_t pos, size_t count, int opcode);
727
728/**
729 * Send OPEN or OPENDIR request
730 */
731int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
732
733struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
734void fuse_file_free(struct fuse_file *ff);
735void fuse_finish_open(struct inode *inode, struct file *file);
736
737void fuse_sync_release(struct fuse_file *ff, int flags);
738
739/**
740 * Send RELEASE or RELEASEDIR request
741 */
742void fuse_release_common(struct file *file, int opcode);
743
744/**
745 * Send FSYNC or FSYNCDIR request
746 */
747int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
748 int datasync, int isdir);
749
750/**
751 * Notify poll wakeup
752 */
753int fuse_notify_poll_wakeup(struct fuse_conn *fc,
754 struct fuse_notify_poll_wakeup_out *outarg);
755
756/**
757 * Initialize file operations on a regular file
758 */
759void fuse_init_file_inode(struct inode *inode);
760
761/**
762 * Initialize inode operations on regular files and special files
763 */
764void fuse_init_common(struct inode *inode);
765
766/**
767 * Initialize inode and file operations on a directory
768 */
769void fuse_init_dir(struct inode *inode);
770
771/**
772 * Initialize inode operations on a symlink
773 */
774void fuse_init_symlink(struct inode *inode);
775
776/**
777 * Change attributes of an inode
778 */
779void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
780 u64 attr_valid, u64 attr_version);
781
782void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
783 u64 attr_valid);
784
785/**
786 * Initialize the client device
787 */
788int fuse_dev_init(void);
789
790/**
791 * Cleanup the client device
792 */
793void fuse_dev_cleanup(void);
794
795int fuse_ctl_init(void);
796void __exit fuse_ctl_cleanup(void);
797
798/**
799 * Allocate a request
800 */
801struct fuse_req *fuse_request_alloc(unsigned npages);
802
803struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
804
805/**
806 * Free a request
807 */
808void fuse_request_free(struct fuse_req *req);
809
810/**
811 * Get a request, may fail with -ENOMEM,
812 * caller should specify # elements in req->pages[] explicitly
813 */
814struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
815struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
816 unsigned npages);
817
818/*
819 * Increment reference count on request
820 */
821void __fuse_get_request(struct fuse_req *req);
822
823/**
824 * Gets a requests for a file operation, always succeeds
825 */
826struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
827 struct file *file);
828
829/**
830 * Decrement reference count of a request. If count goes to zero free
831 * the request.
832 */
833void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
834
835/**
836 * Send a request (synchronous)
837 */
838void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
839
840/**
841 * Simple request sending that does request allocation and freeing
842 */
843ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
844
845/**
846 * Send a request in the background
847 */
848void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
849
850void fuse_request_send_background_locked(struct fuse_conn *fc,
851 struct fuse_req *req);
852
853/* Abort all requests */
854void fuse_abort_conn(struct fuse_conn *fc);
855
856/**
857 * Invalidate inode attributes
858 */
859void fuse_invalidate_attr(struct inode *inode);
860
861void fuse_invalidate_entry_cache(struct dentry *entry);
862
863void fuse_invalidate_atime(struct inode *inode);
864
865/**
866 * Acquire reference to fuse_conn
867 */
868struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
869
870/**
871 * Initialize fuse_conn
872 */
873void fuse_conn_init(struct fuse_conn *fc);
874
875/**
876 * Release reference to fuse_conn
877 */
878void fuse_conn_put(struct fuse_conn *fc);
879
880struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc);
881void fuse_dev_free(struct fuse_dev *fud);
882
883/**
884 * Add connection to control filesystem
885 */
886int fuse_ctl_add_conn(struct fuse_conn *fc);
887
888/**
889 * Remove connection from control filesystem
890 */
891void fuse_ctl_remove_conn(struct fuse_conn *fc);
892
893/**
894 * Is file type valid?
895 */
896int fuse_valid_type(int m);
897
898/**
899 * Is current process allowed to perform filesystem operation?
900 */
901int fuse_allow_current_process(struct fuse_conn *fc);
902
903u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
904
905void fuse_update_ctime(struct inode *inode);
906
907int fuse_update_attributes(struct inode *inode, struct file *file);
908
909void fuse_flush_writepages(struct inode *inode);
910
911void fuse_set_nowrite(struct inode *inode);
912void fuse_release_nowrite(struct inode *inode);
913
914u64 fuse_get_attr_version(struct fuse_conn *fc);
915
916/**
917 * File-system tells the kernel to invalidate cache for the given node id.
918 */
919int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
920 loff_t offset, loff_t len);
921
922/**
923 * File-system tells the kernel to invalidate parent attributes and
924 * the dentry matching parent/name.
925 *
926 * If the child_nodeid is non-zero and:
927 * - matches the inode number for the dentry matching parent/name,
928 * - is not a mount point
929 * - is a file or oan empty directory
930 * then the dentry is unhashed (d_delete()).
931 */
932int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
933 u64 child_nodeid, struct qstr *name);
934
935int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
936 bool isdir);
937
938/**
939 * fuse_direct_io() flags
940 */
941
942/** If set, it is WRITE; otherwise - READ */
943#define FUSE_DIO_WRITE (1 << 0)
944
945/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
946#define FUSE_DIO_CUSE (1 << 1)
947
948ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
949 loff_t *ppos, int flags);
950long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
951 unsigned int flags);
952long fuse_ioctl_common(struct file *file, unsigned int cmd,
953 unsigned long arg, unsigned int flags);
954__poll_t fuse_file_poll(struct file *file, poll_table *wait);
955int fuse_dev_release(struct inode *inode, struct file *file);
956
957bool fuse_write_update_size(struct inode *inode, loff_t pos);
958
959int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
960int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
961
962int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
963 struct file *file);
964
965void fuse_set_initialized(struct fuse_conn *fc);
966
967void fuse_unlock_inode(struct inode *inode);
968void fuse_lock_inode(struct inode *inode);
969
970int fuse_setxattr(struct inode *inode, const char *name, const void *value,
971 size_t size, int flags);
972ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
973 size_t size);
974ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
975int fuse_removexattr(struct inode *inode, const char *name);
976extern const struct xattr_handler *fuse_xattr_handlers[];
977extern const struct xattr_handler *fuse_acl_xattr_handlers[];
978
979struct posix_acl;
980struct posix_acl *fuse_get_acl(struct inode *inode, int type);
981int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
982
983#endif /* _FS_FUSE_I_H */