fuse_i.h 21.3 KB
Newer Older
Miklos Szeredi's avatar
Miklos Szeredi committed
1
2
/*
  FUSE: Filesystem in Userspace
Miklos Szeredi's avatar
Miklos Szeredi committed
3
  Copyright (C) 2001-2008  Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredi's avatar
Miklos Szeredi committed
4
5
6
7
8

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.
*/

Tejun Heo's avatar
Tejun Heo committed
9
10
11
#ifndef _FS_FUSE_I_H
#define _FS_FUSE_I_H

Miklos Szeredi's avatar
Miklos Szeredi committed
12
13
#include <linux/fuse.h>
#include <linux/fs.h>
14
#include <linux/mount.h>
Miklos Szeredi's avatar
Miklos Szeredi committed
15
16
17
18
19
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/backing-dev.h>
20
#include <linux/mutex.h>
Miklos Szeredi's avatar
Miklos Szeredi committed
21
#include <linux/rwsem.h>
Tejun Heo's avatar
Tejun Heo committed
22
23
#include <linux/rbtree.h>
#include <linux/poll.h>
24
#include <linux/workqueue.h>
Miklos Szeredi's avatar
Miklos Szeredi committed
25

26
27
28
/** Max number of pages that can be used in a single read request */
#define FUSE_MAX_PAGES_PER_REQ 32

Miklos Szeredi's avatar
Miklos Szeredi committed
29
30
31
/** Bias for fi->writectr, meaning new writepages must not be sent */
#define FUSE_NOWRITE INT_MIN

32
33
34
/** It could be as large as PATH_MAX, but would that have any uses? */
#define FUSE_NAME_MAX 1024

35
/** Number of dentries for each connection in the control filesystem */
36
#define FUSE_CTL_NUM_DENTRIES 5
37

Miklos Szeredi's avatar
Miklos Szeredi committed
38
39
40
41
42
43
44
45
46
/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
    module will check permissions based on the file mode.  Otherwise no
    permission checking is done in the kernel */
#define FUSE_DEFAULT_PERMISSIONS (1 << 0)

/** If the FUSE_ALLOW_OTHER flag is given, then not only the user
    doing the mount will be allowed to access the filesystem */
#define FUSE_ALLOW_OTHER         (1 << 1)

47
48
49
/** Number of page pointers embedded in fuse_req */
#define FUSE_REQ_INLINE_PAGES 1

50
51
52
53
54
/** List of active connections */
extern struct list_head fuse_conn_list;

/** Global mutex protecting fuse_conn_list and the control filesystem */
extern struct mutex fuse_mutex;
Miklos Szeredi's avatar
Miklos Szeredi committed
55

56
57
58
59
/** Module parameters */
extern unsigned max_user_bgreq;
extern unsigned max_user_congthresh;

60
61
/* One forget request */
struct fuse_forget_link {
62
	struct fuse_forget_one forget_one;
63
64
65
	struct fuse_forget_link *next;
};

Miklos Szeredi's avatar
Miklos Szeredi committed
66
67
68
69
70
71
72
73
74
/** FUSE inode */
struct fuse_inode {
	/** Inode data */
	struct inode inode;

	/** Unique ID, which identifies the inode between userspace
	 * and kernel */
	u64 nodeid;

75
76
77
	/** Number of lookups on this inode */
	u64 nlookup;

78
	/** The request used for sending the FORGET message */
79
	struct fuse_forget_link *forget;
80

Miklos Szeredi's avatar
Miklos Szeredi committed
81
	/** Time in jiffies until the file attributes are valid */
Miklos Szeredi's avatar
Miklos Szeredi committed
82
	u64 i_time;
83
84
85

	/** The sticky bit in inode->i_mode may have been removed, so
	    preserve the original mode */
Al Viro's avatar
Al Viro committed
86
	umode_t orig_i_mode;
87

88
89
90
	/** 64 bit inode number */
	u64 orig_ino;

91
92
	/** Version of last attribute change */
	u64 attr_version;
93
94
95

	/** Files usable in writepage.  Protected by fc->lock */
	struct list_head write_files;
Miklos Szeredi's avatar
Miklos Szeredi committed
96
97
98
99
100
101
102
103
104
105
106
107
108

	/** Writepages pending on truncate or fsync */
	struct list_head queued_writes;

	/** Number of sent writes, a negative bias (FUSE_NOWRITE)
	 * means more writes are blocked */
	int writectr;

	/** Waitq for writepage completion */
	wait_queue_head_t page_waitq;

	/** List of writepage requestst (pending or sent) */
	struct list_head writepages;
109
110
111
112
113
114
115
116
117

	/** Miscellaneous bits describing inode state */
	unsigned long state;
};

/** FUSE inode state bits */
enum {
	/** Advise readdirplus  */
	FUSE_I_ADVISE_RDPLUS,
118
119
	/** Initialized with readdirplus */
	FUSE_I_INIT_RDPLUS,
120
121
	/** An operation changing file size is in progress  */
	FUSE_I_SIZE_UNSTABLE,
Miklos Szeredi's avatar
Miklos Szeredi committed
122
123
};

124
125
struct fuse_conn;

126
127
/** FUSE specific file data */
struct fuse_file {
128
129
130
	/** Fuse connection for this file */
	struct fuse_conn *fc;

131
	/** Request reserved for flush and release */
132
	struct fuse_req *reserved_req;
133

Tejun Heo's avatar
Tejun Heo committed
134
135
136
	/** Kernel file handle guaranteed to be unique */
	u64 kh;

137
138
	/** File handle used by userspace */
	u64 fh;
139

140
141
142
	/** Node id of this file */
	u64 nodeid;

143
144
	/** Refcount */
	atomic_t count;
145

146
147
148
	/** FOPEN_* flags returned by open */
	u32 open_flags;

149
150
	/** Entry on inode's write_files list */
	struct list_head write_entry;
Tejun Heo's avatar
Tejun Heo committed
151
152
153
154
155
156

	/** RB node to be linked on fuse_conn->polled_files */
	struct rb_node polled_node;

	/** Wait queue head for poll */
	wait_queue_head_t poll_wait;
Miklos Szeredi's avatar
Miklos Szeredi committed
157
158
159

	/** Has flock been performed on this file? */
	bool flock:1;
160
161
};

162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/** One input argument of a request */
struct fuse_in_arg {
	unsigned size;
	const void *value;
};

/** The request input */
struct fuse_in {
	/** The request header */
	struct fuse_in_header h;

	/** True if the data for the last argument is in req->pages */
	unsigned argpages:1;

	/** Number of arguments */
	unsigned numargs;

	/** Array of arguments */
	struct fuse_in_arg args[3];
};

/** One output argument of a request */
struct fuse_arg {
	unsigned size;
	void *value;
};

/** The request output */
struct fuse_out {
	/** Header returned from userspace */
	struct fuse_out_header h;

194
195
196
197
198
	/*
	 * The following bitfields are not changed during the request
	 * processing
	 */

199
200
201
202
203
204
205
206
207
208
	/** Last argument is variable length (can be shorter than
	    arg->size) */
	unsigned argvar:1;

	/** Last argument is a list of pages to copy data to */
	unsigned argpages:1;

	/** Zero partially or not copied pages */
	unsigned page_zeroing:1;

209
210
211
	/** Pages may be replaced with new ones */
	unsigned page_replace:1;

212
213
214
215
	/** Number or arguments */
	unsigned numargs;

	/** Array of arguments */
Miklos Szeredi's avatar
Miklos Szeredi committed
216
	struct fuse_arg args[2];
217
218
};

219
220
221
222
223
224
/** FUSE page descriptor */
struct fuse_page_desc {
	unsigned int length;
	unsigned int offset;
};

225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
struct fuse_args {
	struct {
		struct {
			uint32_t opcode;
			uint64_t nodeid;
		} h;
		unsigned numargs;
		struct fuse_in_arg args[3];

	} in;
	struct {
		unsigned argvar:1;
		unsigned numargs;
		struct fuse_arg args[2];
	} out;
};

#define FUSE_ARGS(args) struct fuse_args args = {}

244
245
/** The request state */
enum fuse_req_state {
Miklos Szeredi's avatar
Miklos Szeredi committed
246
247
	FUSE_REQ_PENDING = 0,
	FUSE_REQ_IO,
248
249
250
251
	FUSE_REQ_SENT,
	FUSE_REQ_FINISHED
};

Maxim Patlasov's avatar
Maxim Patlasov committed
252
253
254
255
256
257
258
259
260
261
262
263
/** The request IO state (for asynchronous processing) */
struct fuse_io_priv {
	int async;
	spinlock_t lock;
	unsigned reqs;
	ssize_t bytes;
	size_t size;
	__u64 offset;
	bool write;
	int err;
	struct kiocb *iocb;
	struct file *file;
264
	struct completion *done;
Maxim Patlasov's avatar
Maxim Patlasov committed
265
266
};

Miklos Szeredi's avatar
Miklos Szeredi committed
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/**
 * Request flags
 *
 * FR_ISREPLY:		set if the request has reply
 * FR_FORCE:		force sending of the request even if interrupted
 * FR_BACKGROUND:	request is sent in the background
 * FR_WAITING:		request is counted as "waiting"
 * FR_ABORTED:		the request was aborted
 * FR_INTERRUPTED:	the request has been interrupted
 * FR_LOCKED:		data is being copied to/from the request
 */
enum fuse_req_flag {
	FR_ISREPLY,
	FR_FORCE,
	FR_BACKGROUND,
	FR_WAITING,
	FR_ABORTED,
	FR_INTERRUPTED,
	FR_LOCKED,
};

288
289
/**
 * A request to the client
290
291
292
293
 *
 * .waitq.lock protects the following fields:
 *   - FR_ABORTED
 *   - FR_LOCKED (may also be modified under fc->lock, tested under both)
294
295
 */
struct fuse_req {
296
297
	/** This can be on either pending processing or io lists in
	    fuse_conn */
298
299
	struct list_head list;

300
301
302
	/** Entry on the interrupts list  */
	struct list_head intr_entry;

303
304
305
	/** refcount */
	atomic_t count;

306
307
308
	/** Unique ID for the interrupt request */
	u64 intr_unique;

Miklos Szeredi's avatar
Miklos Szeredi committed
309
310
	/* Request flags, updated with test/set/clear_bit() */
	unsigned long flags;
311

312
313
	/** State of the request */
	enum fuse_req_state state;
314
315
316
317
318
319
320
321
322
323
324
325

	/** The request input */
	struct fuse_in in;

	/** The request output */
	struct fuse_out out;

	/** Used to wake up the task waiting for completion of request*/
	wait_queue_head_t waitq;

	/** Data for asynchronous requests */
	union {
326
		struct {
327
328
			struct fuse_release_in in;
			struct inode *inode;
329
		} release;
330
331
		struct fuse_init_in init_in;
		struct fuse_init_out init_out;
332
		struct cuse_init_in cuse_init_in;
333
334
335
336
		struct {
			struct fuse_read_in in;
			u64 attr_ver;
		} read;
337
338
339
		struct {
			struct fuse_write_in in;
			struct fuse_write_out out;
340
			struct fuse_req *next;
341
		} write;
Miklos Szeredi's avatar
Miklos Szeredi committed
342
		struct fuse_notify_retrieve_in retrieve_in;
343
344
345
	} misc;

	/** page vector */
346
347
	struct page **pages;

348
349
350
	/** page-descriptor vector */
	struct fuse_page_desc *page_descs;

351
352
353
354
355
	/** size of the 'pages' array */
	unsigned max_pages;

	/** inline page vector */
	struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
356

357
358
359
	/** inline page-descriptor vector */
	struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];

360
361
362
363
	/** number of pages in vector */
	unsigned num_pages;

	/** File used in the request (or NULL) */
364
	struct fuse_file *ff;
365

Miklos Szeredi's avatar
Miklos Szeredi committed
366
367
368
	/** Inode used in the request or NULL */
	struct inode *inode;

Maxim Patlasov's avatar
Maxim Patlasov committed
369
370
371
	/** AIO control block */
	struct fuse_io_priv *io;

Miklos Szeredi's avatar
Miklos Szeredi committed
372
373
374
	/** Link on fi->writepages */
	struct list_head writepages_entry;

375
376
	/** Request completion callback */
	void (*end)(struct fuse_conn *, struct fuse_req *);
377
378
379

	/** Request is stolen from fuse_file->reserved_req */
	struct file *stolen_file;
380
381
};

Miklos Szeredi's avatar
Miklos Szeredi committed
382
383
384
385
386
387
388
389
/**
 * A Fuse connection.
 *
 * This structure is created, when the filesystem is mounted, and is
 * destroyed, when the client device is closed and the filesystem is
 * unmounted.
 */
struct fuse_conn {
390
391
392
	/** Lock protecting accessess to  members of this structure */
	spinlock_t lock;

393
394
395
	/** Refcount */
	atomic_t count;

Al Viro's avatar
Al Viro committed
396
397
	struct rcu_head rcu;

Miklos Szeredi's avatar
Miklos Szeredi committed
398
	/** The user id for this mount */
399
	kuid_t user_id;
Miklos Szeredi's avatar
Miklos Szeredi committed
400

401
	/** The group id for this mount */
402
	kgid_t group_id;
403

Miklos Szeredi's avatar
Miklos Szeredi committed
404
405
406
	/** The fuse mount flags for this mount */
	unsigned flags;

407
408
409
	/** Maximum read size */
	unsigned max_read;

Miklos Szeredi's avatar
Miklos Szeredi committed
410
411
412
	/** Maximum write size */
	unsigned max_write;

413
414
415
416
417
418
419
420
421
	/** Readers of the connection are waiting on this */
	wait_queue_head_t waitq;

	/** The list of pending requests */
	struct list_head pending;

	/** The list of requests being processed */
	struct list_head processing;

422
423
424
	/** The list of requests under I/O */
	struct list_head io;

Tejun Heo's avatar
Tejun Heo committed
425
426
427
	/** The next unique kernel file handle */
	u64 khctr;

Tejun Heo's avatar
Tejun Heo committed
428
429
430
	/** rbtree of fuse_files waiting for poll events indexed by ph */
	struct rb_root polled_files;

431
432
433
434
435
436
	/** Maximum number of outstanding background requests */
	unsigned max_background;

	/** Number of background requests at which congestion starts */
	unsigned congestion_threshold;

437
438
439
	/** Number of requests currently in the background */
	unsigned num_background;

440
441
442
443
444
445
	/** Number of background requests currently queued for userspace */
	unsigned active_background;

	/** The list of background requests set aside for later queuing */
	struct list_head bg_queue;

446
447
448
	/** Pending interrupts */
	struct list_head interrupts;

449
450
451
452
453
454
455
	/** Queue of pending forgets */
	struct fuse_forget_link forget_list_head;
	struct fuse_forget_link *forget_list_tail;

	/** Batching of FORGET requests (positive indicates FORGET batch) */
	int forget_batch;

456
457
458
459
	/** Flag indicating that INIT reply has been received. Allocating
	 * any fuse request will be suspended until the flag is set */
	int initialized;

460
461
462
463
464
465
466
	/** Flag indicating if connection is blocked.  This will be
	    the case before the INIT reply is received, and if there
	    are too many outstading backgrounds requests */
	int blocked;

	/** waitq for blocked connection */
	wait_queue_head_t blocked_waitq;
467
468
469

	/** waitq for reserved requests */
	wait_queue_head_t reserved_req_waitq;
470

471
472
473
	/** The next unique request id */
	u64 reqctr;

474
475
	/** Connection established, cleared on umount, connection
	    abort and device release */
476
	unsigned connected;
Miklos Szeredi's avatar
Miklos Szeredi committed
477

478
479
480
	/** Connection failed (version mismatch).  Cannot race with
	    setting other bitfields since it is only set once in INIT
	    reply, before any other request, and never cleared */
Miklos Szeredi's avatar
Miklos Szeredi committed
481
	unsigned conn_error:1;
482

483
	/** Connection successful.  Only set in INIT */
Miklos Szeredi's avatar
Miklos Szeredi committed
484
	unsigned conn_init:1;
485

486
	/** Do readpages asynchronously?  Only set in INIT */
Miklos Szeredi's avatar
Miklos Szeredi committed
487
	unsigned async_read:1;
488

489
	/** Do not send separate SETATTR request before open(O_TRUNC)  */
Miklos Szeredi's avatar
Miklos Szeredi committed
490
	unsigned atomic_o_trunc:1;
491

492
	/** Filesystem supports NFS exporting.  Only set in INIT */
Miklos Szeredi's avatar
Miklos Szeredi committed
493
	unsigned export_support:1;
494

495
496
497
	/** Set if bdi is valid */
	unsigned bdi_initialized:1;

498
499
500
	/** write-back cache policy (default is write-through) */
	unsigned writeback_cache:1;

501
502
503
504
505
	/*
	 * The following bitfields are only for optimization purposes
	 * and hence races in setting them will not cause malfunction
	 */

506
507
508
	/** Is open/release not implemented by fs? */
	unsigned no_open:1;

509
	/** Is fsync not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
510
	unsigned no_fsync:1;
511

512
	/** Is fsyncdir not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
513
	unsigned no_fsyncdir:1;
514

515
	/** Is flush not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
516
	unsigned no_flush:1;
517

518
	/** Is setxattr not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
519
	unsigned no_setxattr:1;
520
521

	/** Is getxattr not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
522
	unsigned no_getxattr:1;
523
524

	/** Is listxattr not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
525
	unsigned no_listxattr:1;
526
527

	/** Is removexattr not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
528
	unsigned no_removexattr:1;
529

Miklos Szeredi's avatar
Miklos Szeredi committed
530
	/** Are posix file locking primitives not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
531
	unsigned no_lock:1;
532

Miklos Szeredi's avatar
Miklos Szeredi committed
533
	/** Is access not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
534
	unsigned no_access:1;
Miklos Szeredi's avatar
Miklos Szeredi committed
535

536
	/** Is create not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
537
	unsigned no_create:1;
538

539
	/** Is interrupt not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
540
	unsigned no_interrupt:1;
541

542
	/** Is bmap not implemented by fs? */
Miklos Szeredi's avatar
Miklos Szeredi committed
543
	unsigned no_bmap:1;
544

Tejun Heo's avatar
Tejun Heo committed
545
546
547
	/** Is poll not implemented by fs? */
	unsigned no_poll:1;

548
	/** Do multi-page cached writes */
Miklos Szeredi's avatar
Miklos Szeredi committed
549
	unsigned big_writes:1;
550

551
552
553
	/** Don't apply umask to creation modes */
	unsigned dont_mask:1;

Miklos Szeredi's avatar
Miklos Szeredi committed
554
555
556
	/** Are BSD file locking primitives not implemented by fs? */
	unsigned no_flock:1;

557
558
559
	/** Is fallocate not implemented by fs? */
	unsigned no_fallocate:1;

Miklos Szeredi's avatar
Miklos Szeredi committed
560
561
562
	/** Is rename with flags implemented by fs? */
	unsigned no_rename2:1;

563
564
565
	/** Use enhanced/automatic page cache invalidation. */
	unsigned auto_inval_data:1;

566
	/** Does the filesystem support readdirplus? */
567
568
	unsigned do_readdirplus:1;

569
570
571
	/** Does the filesystem want adaptive readdirplus? */
	unsigned readdirplus_auto:1;

572
573
574
	/** Does the filesystem support asynchronous direct-IO submission? */
	unsigned async_dio:1;

575
576
577
	/** The number of requests waiting for completion */
	atomic_t num_waiting;

578
579
580
	/** Negotiated minor version */
	unsigned minor;

Miklos Szeredi's avatar
Miklos Szeredi committed
581
582
	/** Backing dev info */
	struct backing_dev_info bdi;
583

584
585
586
	/** Entry on the fuse_conn_list */
	struct list_head entry;

587
588
	/** Device ID from super block */
	dev_t dev;
589
590
591
592
593
594

	/** Dentries in the control filesystem */
	struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];

	/** number of dentries used in the above array */
	int ctl_ndents;
595
596
597

	/** O_ASYNC requests */
	struct fasync_struct *fasync;
598
599
600

	/** Key for lock owner ID scrambling */
	u32 scramble_key[4];
601
602
603

	/** Reserved request for the DESTROY message */
	struct fuse_req *destroy_req;
604
605
606

	/** Version counter for attribute changes */
	u64 attr_version;
Tejun Heo's avatar
Tejun Heo committed
607
608
609

	/** Called on final put */
	void (*release)(struct fuse_conn *);
John Muir's avatar
John Muir committed
610
611
612
613
614
615

	/** Super block for this connection. */
	struct super_block *sb;

	/** Read/write semaphore to hold when accessing sb. */
	struct rw_semaphore killsb;
Miklos Szeredi's avatar
Miklos Szeredi committed
616
617
618
619
};

static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
{
620
	return sb->s_fs_info;
Miklos Szeredi's avatar
Miklos Szeredi committed
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
}

static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
{
	return get_fuse_conn_super(inode->i_sb);
}

static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
{
	return container_of(inode, struct fuse_inode, inode);
}

static inline u64 get_node_id(struct inode *inode)
{
	return get_fuse_inode(inode)->nodeid;
}

638
/** Device operations */
639
extern const struct file_operations fuse_dev_operations;
640

Al Viro's avatar
Al Viro committed
641
extern const struct dentry_operations fuse_dentry_operations;
Miklos Szeredi's avatar
Miklos Szeredi committed
642

John Muir's avatar
John Muir committed
643
644
645
646
647
/**
 * Inode to nodeid comparison.
 */
int fuse_inode_eq(struct inode *inode, void *_nodeidp);

648
649
650
/**
 * Get a filled in inode
 */
Miklos Szeredi's avatar
Miklos Szeredi committed
651
struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
652
653
			int generation, struct fuse_attr *attr,
			u64 attr_valid, u64 attr_version);
654

655
656
657
int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
		     struct fuse_entry_out *outarg, struct inode **inode);

658
659
660
/**
 * Send FORGET command
 */
661
662
663
664
void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
		       u64 nodeid, u64 nlookup);

struct fuse_forget_link *fuse_alloc_forget(void);
665

666
667
668
/* Used by READDIRPLUS */
void fuse_force_forget(struct file *file, u64 nodeid);

669
/**
670
 * Initialize READ or READDIR request
671
 */
672
void fuse_read_fill(struct fuse_req *req, struct file *file,
673
		    loff_t pos, size_t count, int opcode);
674
675
676
677

/**
 * Send OPEN or OPENDIR request
 */
678
int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
679

Tejun Heo's avatar
Tejun Heo committed
680
struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
681
struct fuse_file *fuse_file_get(struct fuse_file *ff);
682
void fuse_file_free(struct fuse_file *ff);
683
void fuse_finish_open(struct inode *inode, struct file *file);
684

685
void fuse_sync_release(struct fuse_file *ff, int flags);
686

687
688
689
/**
 * Send RELEASE or RELEASEDIR request
 */
690
void fuse_release_common(struct file *file, int opcode);
691

692
693
694
/**
 * Send FSYNC or FSYNCDIR request
 */
695
696
int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
		      int datasync, int isdir);
697

Tejun Heo's avatar
Tejun Heo committed
698
699
700
701
702
703
/**
 * Notify poll wakeup
 */
int fuse_notify_poll_wakeup(struct fuse_conn *fc,
			    struct fuse_notify_poll_wakeup_out *outarg);

704
/**
Miklos Szeredi's avatar
Miklos Szeredi committed
705
 * Initialize file operations on a regular file
706
707
708
 */
void fuse_init_file_inode(struct inode *inode);

709
/**
Miklos Szeredi's avatar
Miklos Szeredi committed
710
 * Initialize inode operations on regular files and special files
711
712
713
714
 */
void fuse_init_common(struct inode *inode);

/**
Miklos Szeredi's avatar
Miklos Szeredi committed
715
 * Initialize inode and file operations on a directory
716
717
718
719
 */
void fuse_init_dir(struct inode *inode);

/**
Miklos Szeredi's avatar
Miklos Szeredi committed
720
 * Initialize inode operations on a symlink
721
722
723
724
725
726
 */
void fuse_init_symlink(struct inode *inode);

/**
 * Change attributes of an inode
 */
727
728
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
			    u64 attr_valid, u64 attr_version);
729

Miklos Szeredi's avatar
Miklos Szeredi committed
730
731
732
void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
				   u64 attr_valid);

733
734
735
736
737
738
739
740
741
742
/**
 * Initialize the client device
 */
int fuse_dev_init(void);

/**
 * Cleanup the client device
 */
void fuse_dev_cleanup(void);

743
int fuse_ctl_init(void);
744
void __exit fuse_ctl_cleanup(void);
745

746
747
748
/**
 * Allocate a request
 */
749
struct fuse_req *fuse_request_alloc(unsigned npages);
750

751
struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
Miklos Szeredi's avatar
Miklos Szeredi committed
752

753
754
755
756
757
758
/**
 * Free a request
 */
void fuse_request_free(struct fuse_req *req);

/**
759
760
 * Get a request, may fail with -ENOMEM,
 * caller should specify # elements in req->pages[] explicitly
761
 */
762
struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
763
764
struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
					     unsigned npages);
765

766
767
768
769
770
/*
 * Increment reference count on request
 */
void __fuse_get_request(struct fuse_req *req);

771
772
773
/**
 * Gets a requests for a file operation, always succeeds
 */
774
775
struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
					     struct file *file);
776

777
/**
778
779
 * Decrement reference count of a request.  If count goes to zero free
 * the request.
780
781
782
783
 */
void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);

/**
784
 * Send a request (synchronous)
785
 */
786
void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
787

788
789
790
791
792
/**
 * Simple request sending that does request allocation and freeing
 */
ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);

793
794
795
/**
 * Send a request in the background
 */
796
void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
797

798
799
void fuse_request_send_background_locked(struct fuse_conn *fc,
					 struct fuse_req *req);
Miklos Szeredi's avatar
Miklos Szeredi committed
800

801
/* Abort all requests */
802
803
void fuse_abort_conn(struct fuse_conn *fc);

804
805
806
807
/**
 * Invalidate inode attributes
 */
void fuse_invalidate_attr(struct inode *inode);
808

Miklos Szeredi's avatar
Miklos Szeredi committed
809
810
void fuse_invalidate_entry_cache(struct dentry *entry);

811
812
void fuse_invalidate_atime(struct inode *inode);

813
814
815
816
817
/**
 * Acquire reference to fuse_conn
 */
struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);

818
819
820
/**
 * Initialize fuse_conn
 */
821
void fuse_conn_init(struct fuse_conn *fc);
822

823
824
825
826
827
828
829
830
831
832
833
834
835
836
/**
 * Release reference to fuse_conn
 */
void fuse_conn_put(struct fuse_conn *fc);

/**
 * Add connection to control filesystem
 */
int fuse_ctl_add_conn(struct fuse_conn *fc);

/**
 * Remove connection from control filesystem
 */
void fuse_ctl_remove_conn(struct fuse_conn *fc);
837
838
839
840
841

/**
 * Is file type valid?
 */
int fuse_valid_type(int m);
Miklos Szeredi's avatar
Miklos Szeredi committed
842
843

/**
844
 * Is current process allowed to perform filesystem operation?
Miklos Szeredi's avatar
Miklos Szeredi committed
845
 */
846
int fuse_allow_current_process(struct fuse_conn *fc);
847
848

u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
Miklos Szeredi's avatar
Miklos Szeredi committed
849
850
851

int fuse_update_attributes(struct inode *inode, struct kstat *stat,
			   struct file *file, bool *refreshed);
Miklos Szeredi's avatar
Miklos Szeredi committed
852
853
854
855
856

void fuse_flush_writepages(struct inode *inode);

void fuse_set_nowrite(struct inode *inode);
void fuse_release_nowrite(struct inode *inode);
857
858

u64 fuse_get_attr_version(struct fuse_conn *fc);
Tejun Heo's avatar
Tejun Heo committed
859

John Muir's avatar
John Muir committed
860
861
862
863
864
865
866
867
868
/**
 * File-system tells the kernel to invalidate cache for the given node id.
 */
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
			     loff_t offset, loff_t len);

/**
 * File-system tells the kernel to invalidate parent attributes and
 * the dentry matching parent/name.
869
870
871
872
873
874
 *
 * If the child_nodeid is non-zero and:
 *    - matches the inode number for the dentry matching parent/name,
 *    - is not a mount point
 *    - is a file or oan empty directory
 * then the dentry is unhashed (d_delete()).
John Muir's avatar
John Muir committed
875
876
 */
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
877
			     u64 child_nodeid, struct qstr *name);
John Muir's avatar
John Muir committed
878

879
880
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
		 bool isdir);
881
882
883
884
885
886
887
888
889
890
891

/**
 * fuse_direct_io() flags
 */

/** If set, it is WRITE; otherwise - READ */
#define FUSE_DIO_WRITE (1 << 0)

/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
#define FUSE_DIO_CUSE  (1 << 1)

892
893
ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
		       loff_t *ppos, int flags);
894
895
long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
		   unsigned int flags);
896
897
long fuse_ioctl_common(struct file *file, unsigned int cmd,
		       unsigned long arg, unsigned int flags);
898
899
900
unsigned fuse_file_poll(struct file *file, poll_table *wait);
int fuse_dev_release(struct inode *inode, struct file *file);

901
902
bool fuse_write_update_size(struct inode *inode, loff_t pos);

903
int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
Miklos Szeredi's avatar
Miklos Szeredi committed
904
int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
Miklos Szeredi's avatar
Miklos Szeredi committed
905

906
907
908
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
		    struct file *file);

909
910
void fuse_set_initialized(struct fuse_conn *fc);

Tejun Heo's avatar
Tejun Heo committed
911
#endif /* _FS_FUSE_I_H */