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
28 /** Max number of pages that can be used in a single read request */
29 #define FUSE_MAX_PAGES_PER_REQ 32
30
31 /** Bias for fi->writectr, meaning new writepages must not be sent */
32 #define FUSE_NOWRITE INT_MIN
33
34 /** It could be as large as PATH_MAX, but would that have any uses? */
35 #define FUSE_NAME_MAX 1024
36
37 /** Number of dentries for each connection in the control filesystem */
38 #define FUSE_CTL_NUM_DENTRIES 5
39
40 /** Number of page pointers embedded in fuse_req */
41 #define FUSE_REQ_INLINE_PAGES 1
42
43 /** List of active connections */
44 extern struct list_head fuse_conn_list;
45
46 /** Global mutex protecting fuse_conn_list and the control filesystem */
47 extern struct mutex fuse_mutex;
48
49 /** Module parameters */
50 extern unsigned max_user_bgreq;
51 extern unsigned max_user_congthresh;
52
53 /* One forget request */
54 struct fuse_forget_link {
55 struct fuse_forget_one forget_one;
56 struct fuse_forget_link *next;
57 };
58
59 /** FUSE inode */
60 struct fuse_inode {
61 /** Inode data */
62 struct inode inode;
63
64 /** Unique ID, which identifies the inode between userspace
65 * and kernel */
66 u64 nodeid;
67
68 /** Number of lookups on this inode */
69 u64 nlookup;
70
71 /** The request used for sending the FORGET message */
72 struct fuse_forget_link *forget;
73
74 /** Time in jiffies until the file attributes are valid */
75 u64 i_time;
76
77 /** The sticky bit in inode->i_mode may have been removed, so
78 preserve the original mode */
79 umode_t orig_i_mode;
80
81 /** 64 bit inode number */
82 u64 orig_ino;
83
84 /** Version of last attribute change */
85 u64 attr_version;
86
87 /** Files usable in writepage. Protected by fc->lock */
88 struct list_head write_files;
89
90 /** Writepages pending on truncate or fsync */
91 struct list_head queued_writes;
92
93 /** Number of sent writes, a negative bias (FUSE_NOWRITE)
94 * means more writes are blocked */
95 int writectr;
96
97 /** Waitq for writepage completion */
98 wait_queue_head_t page_waitq;
99
100 /** List of writepage requestst (pending or sent) */
101 struct list_head writepages;
102
103 /** Miscellaneous bits describing inode state */
104 unsigned long state;
105
106 /** Lock for serializing lookup and readdir for back compatibility*/
107 struct mutex mutex;
108 };
109
110 /** FUSE inode state bits */
111 enum {
112 /** Advise readdirplus */
113 FUSE_I_ADVISE_RDPLUS,
114 /** Initialized with readdirplus */
115 FUSE_I_INIT_RDPLUS,
116 /** An operation changing file size is in progress */
117 FUSE_I_SIZE_UNSTABLE,
118 };
119
120 struct fuse_conn;
121
122 /** FUSE specific file data */
123 struct fuse_file {
124 /** Fuse connection for this file */
125 struct fuse_conn *fc;
126
127 /** Request reserved for flush and release */
128 struct fuse_req *reserved_req;
129
130 /** Kernel file handle guaranteed to be unique */
131 u64 kh;
132
133 /** File handle used by userspace */
134 u64 fh;
135
136 /** Node id of this file */
137 u64 nodeid;
138
139 /** Refcount */
140 atomic_t count;
141
142 /** FOPEN_* flags returned by open */
143 u32 open_flags;
144
145 /** Entry on inode's write_files list */
146 struct list_head write_entry;
147
148 /** RB node to be linked on fuse_conn->polled_files */
149 struct rb_node polled_node;
150
151 /** Wait queue head for poll */
152 wait_queue_head_t poll_wait;
153
154 /** Has flock been performed on this file? */
155 bool flock:1;
156 };
157
158 /** One input argument of a request */
159 struct fuse_in_arg {
160 unsigned size;
161 const void *value;
162 };
163
164 /** The request input */
165 struct fuse_in {
166 /** The request header */
167 struct fuse_in_header h;
168
169 /** True if the data for the last argument is in req->pages */
170 unsigned argpages:1;
171
172 /** Number of arguments */
173 unsigned numargs;
174
175 /** Array of arguments */
176 struct fuse_in_arg args[3];
177 };
178
179 /** One output argument of a request */
180 struct fuse_arg {
181 unsigned size;
182 void *value;
183 };
184
185 /** The request output */
186 struct fuse_out {
187 /** Header returned from userspace */
188 struct fuse_out_header h;
189
190 /*
191 * The following bitfields are not changed during the request
192 * processing
193 */
194
195 /** Last argument is variable length (can be shorter than
196 arg->size) */
197 unsigned argvar:1;
198
199 /** Last argument is a list of pages to copy data to */
200 unsigned argpages:1;
201
202 /** Zero partially or not copied pages */
203 unsigned page_zeroing:1;
204
205 /** Pages may be replaced with new ones */
206 unsigned page_replace:1;
207
208 /** Number or arguments */
209 unsigned numargs;
210
211 /** Array of arguments */
212 struct fuse_arg args[2];
213 };
214
215 /** FUSE page descriptor */
216 struct fuse_page_desc {
217 unsigned int length;
218 unsigned int offset;
219 };
220
221 struct fuse_args {
222 struct {
223 struct {
224 uint32_t opcode;
225 uint64_t nodeid;
226 } h;
227 unsigned numargs;
228 struct fuse_in_arg args[3];
229
230 } in;
231 struct {
232 unsigned argvar:1;
233 unsigned numargs;
234 struct fuse_arg args[2];
235 } out;
236 };
237
238 #define FUSE_ARGS(args) struct fuse_args args = {}
239
240 /** The request IO state (for asynchronous processing) */
241 struct fuse_io_priv {
242 struct kref refcnt;
243 int async;
244 spinlock_t lock;
245 unsigned reqs;
246 ssize_t bytes;
247 size_t size;
248 __u64 offset;
249 bool write;
250 int err;
251 struct kiocb *iocb;
252 struct file *file;
253 struct completion *done;
254 bool blocking;
255 };
256
257 #define FUSE_IO_PRIV_SYNC(f) \
258 { \
259 .refcnt = { ATOMIC_INIT(1) }, \
260 .async = 0, \
261 .file = f, \
262 }
263
264 /**
265 * Request flags
266 *
267 * FR_ISREPLY: set if the request has reply
268 * FR_FORCE: force sending of the request even if interrupted
269 * FR_BACKGROUND: request is sent in the background
270 * FR_WAITING: request is counted as "waiting"
271 * FR_ABORTED: the request was aborted
272 * FR_INTERRUPTED: the request has been interrupted
273 * FR_LOCKED: data is being copied to/from the request
274 * FR_PENDING: request is not yet in userspace
275 * FR_SENT: request is in userspace, waiting for an answer
276 * FR_FINISHED: request is finished
277 * FR_PRIVATE: request is on private list
278 */
279 enum fuse_req_flag {
280 FR_ISREPLY,
281 FR_FORCE,
282 FR_BACKGROUND,
283 FR_WAITING,
284 FR_ABORTED,
285 FR_INTERRUPTED,
286 FR_LOCKED,
287 FR_PENDING,
288 FR_SENT,
289 FR_FINISHED,
290 FR_PRIVATE,
291 };
292
293 /**
294 * A request to the client
295 *
296 * .waitq.lock protects the following fields:
297 * - FR_ABORTED
298 * - FR_LOCKED (may also be modified under fc->lock, tested under both)
299 */
300 struct fuse_req {
301 /** This can be on either pending processing or io lists in
302 fuse_conn */
303 struct list_head list;
304
305 /** Entry on the interrupts list */
306 struct list_head intr_entry;
307
308 /** refcount */
309 atomic_t count;
310
311 /** Unique ID for the interrupt request */
312 u64 intr_unique;
313
314 /* Request flags, updated with test/set/clear_bit() */
315 unsigned long flags;
316
317 /** The request input */
318 struct fuse_in in;
319
320 /** The request output */
321 struct fuse_out out;
322
323 /** Used to wake up the task waiting for completion of request*/
324 wait_queue_head_t waitq;
325
326 /** Data for asynchronous requests */
327 union {
328 struct {
329 struct fuse_release_in in;
330 struct inode *inode;
331 } release;
332 struct fuse_init_in init_in;
333 struct fuse_init_out init_out;
334 struct cuse_init_in cuse_init_in;
335 struct {
336 struct fuse_read_in in;
337 u64 attr_ver;
338 } read;
339 struct {
340 struct fuse_write_in in;
341 struct fuse_write_out out;
342 struct fuse_req *next;
343 } write;
344 struct fuse_notify_retrieve_in retrieve_in;
345 } misc;
346
347 /** page vector */
348 struct page **pages;
349
350 /** page-descriptor vector */
351 struct fuse_page_desc *page_descs;
352
353 /** size of the 'pages' array */
354 unsigned max_pages;
355
356 /** inline page vector */
357 struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
358
359 /** inline page-descriptor vector */
360 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
361
362 /** number of pages in vector */
363 unsigned num_pages;
364
365 /** File used in the request (or NULL) */
366 struct fuse_file *ff;
367
368 /** Inode used in the request or NULL */
369 struct inode *inode;
370
371 /** Path used for completing d_canonical_path */
372 struct path *canonical_path;
373
374 /** AIO control block */
375 struct fuse_io_priv *io;
376
377 /** Link on fi->writepages */
378 struct list_head writepages_entry;
379
380 /** Request completion callback */
381 void (*end)(struct fuse_conn *, struct fuse_req *);
382
383 /** Request is stolen from fuse_file->reserved_req */
384 struct file *stolen_file;
385 };
386
387 struct fuse_iqueue {
388 /** Connection established */
389 unsigned connected;
390
391 /** Readers of the connection are waiting on this */
392 wait_queue_head_t waitq;
393
394 /** The next unique request id */
395 u64 reqctr;
396
397 /** The list of pending requests */
398 struct list_head pending;
399
400 /** Pending interrupts */
401 struct list_head interrupts;
402
403 /** Queue of pending forgets */
404 struct fuse_forget_link forget_list_head;
405 struct fuse_forget_link *forget_list_tail;
406
407 /** Batching of FORGET requests (positive indicates FORGET batch) */
408 int forget_batch;
409
410 /** O_ASYNC requests */
411 struct fasync_struct *fasync;
412 };
413
414 struct fuse_pqueue {
415 /** Connection established */
416 unsigned connected;
417
418 /** Lock protecting accessess to members of this structure */
419 spinlock_t lock;
420
421 /** The list of requests being processed */
422 struct list_head processing;
423
424 /** The list of requests under I/O */
425 struct list_head io;
426 };
427
428 /**
429 * Fuse device instance
430 */
431 struct fuse_dev {
432 /** Fuse connection for this device */
433 struct fuse_conn *fc;
434
435 /** Processing queue */
436 struct fuse_pqueue pq;
437
438 /** list entry on fc->devices */
439 struct list_head entry;
440 };
441
442 /**
443 * A Fuse connection.
444 *
445 * This structure is created, when the filesystem is mounted, and is
446 * destroyed, when the client device is closed and the filesystem is
447 * unmounted.
448 */
449 struct fuse_conn {
450 /** Lock protecting accessess to members of this structure */
451 spinlock_t lock;
452
453 /** Refcount */
454 atomic_t count;
455
456 /** Number of fuse_dev's */
457 atomic_t dev_count;
458
459 struct rcu_head rcu;
460
461 /** The user id for this mount */
462 kuid_t user_id;
463
464 /** The group id for this mount */
465 kgid_t group_id;
466
467 /** Maximum read size */
468 unsigned max_read;
469
470 /** Maximum write size */
471 unsigned max_write;
472
473 /** Input queue */
474 struct fuse_iqueue iq;
475
476 /** The next unique kernel file handle */
477 u64 khctr;
478
479 /** rbtree of fuse_files waiting for poll events indexed by ph */
480 struct rb_root polled_files;
481
482 /** Maximum number of outstanding background requests */
483 unsigned max_background;
484
485 /** Number of background requests at which congestion starts */
486 unsigned congestion_threshold;
487
488 /** Number of requests currently in the background */
489 unsigned num_background;
490
491 /** Number of background requests currently queued for userspace */
492 unsigned active_background;
493
494 /** The list of background requests set aside for later queuing */
495 struct list_head bg_queue;
496
497 /** Flag indicating that INIT reply has been received. Allocating
498 * any fuse request will be suspended until the flag is set */
499 int initialized;
500
501 /** Flag indicating if connection is blocked. This will be
502 the case before the INIT reply is received, and if there
503 are too many outstading backgrounds requests */
504 int blocked;
505
506 /** waitq for blocked connection */
507 wait_queue_head_t blocked_waitq;
508
509 /** waitq for reserved requests */
510 wait_queue_head_t reserved_req_waitq;
511
512 /** Connection established, cleared on umount, connection
513 abort and device release */
514 unsigned connected;
515
516 /** Connection failed (version mismatch). Cannot race with
517 setting other bitfields since it is only set once in INIT
518 reply, before any other request, and never cleared */
519 unsigned conn_error:1;
520
521 /** Connection successful. Only set in INIT */
522 unsigned conn_init:1;
523
524 /** Do readpages asynchronously? Only set in INIT */
525 unsigned async_read:1;
526
527 /** Do not send separate SETATTR request before open(O_TRUNC) */
528 unsigned atomic_o_trunc:1;
529
530 /** Filesystem supports NFS exporting. Only set in INIT */
531 unsigned export_support:1;
532
533 /** Set if bdi is valid */
534 unsigned bdi_initialized:1;
535
536 /** write-back cache policy (default is write-through) */
537 unsigned writeback_cache:1;
538
539 /** allow parallel lookups and readdir (default is serialized) */
540 unsigned parallel_dirops:1;
541
542 /** handle fs handles killing suid/sgid/cap on write/chown/trunc */
543 unsigned handle_killpriv:1;
544
545 /*
546 * The following bitfields are only for optimization purposes
547 * and hence races in setting them will not cause malfunction
548 */
549
550 /** Is open/release not implemented by fs? */
551 unsigned no_open:1;
552
553 /** Is fsync not implemented by fs? */
554 unsigned no_fsync:1;
555
556 /** Is fsyncdir not implemented by fs? */
557 unsigned no_fsyncdir:1;
558
559 /** Is flush not implemented by fs? */
560 unsigned no_flush:1;
561
562 /** Is setxattr not implemented by fs? */
563 unsigned no_setxattr:1;
564
565 /** Is getxattr not implemented by fs? */
566 unsigned no_getxattr:1;
567
568 /** Is listxattr not implemented by fs? */
569 unsigned no_listxattr:1;
570
571 /** Is removexattr not implemented by fs? */
572 unsigned no_removexattr:1;
573
574 /** Are posix file locking primitives not implemented by fs? */
575 unsigned no_lock:1;
576
577 /** Is access not implemented by fs? */
578 unsigned no_access:1;
579
580 /** Is create not implemented by fs? */
581 unsigned no_create:1;
582
583 /** Is interrupt not implemented by fs? */
584 unsigned no_interrupt:1;
585
586 /** Is bmap not implemented by fs? */
587 unsigned no_bmap:1;
588
589 /** Is poll not implemented by fs? */
590 unsigned no_poll:1;
591
592 /** Do multi-page cached writes */
593 unsigned big_writes:1;
594
595 /** Don't apply umask to creation modes */
596 unsigned dont_mask:1;
597
598 /** Are BSD file locking primitives not implemented by fs? */
599 unsigned no_flock:1;
600
601 /** Is fallocate not implemented by fs? */
602 unsigned no_fallocate:1;
603
604 /** Is rename with flags implemented by fs? */
605 unsigned no_rename2:1;
606
607 /** Use enhanced/automatic page cache invalidation. */
608 unsigned auto_inval_data:1;
609
610 /** Does the filesystem support readdirplus? */
611 unsigned do_readdirplus:1;
612
613 /** Does the filesystem want adaptive readdirplus? */
614 unsigned readdirplus_auto:1;
615
616 /** Does the filesystem support asynchronous direct-IO submission? */
617 unsigned async_dio:1;
618
619 /** Is lseek not implemented by fs? */
620 unsigned no_lseek:1;
621
622 /** Does the filesystem support posix acls? */
623 unsigned posix_acl:1;
624
625 /** Check permissions based on the file mode or not? */
626 unsigned default_permissions:1;
627
628 /** Allow other than the mounter user to access the filesystem ? */
629 unsigned allow_other:1;
630
631 /** The number of requests waiting for completion */
632 atomic_t num_waiting;
633
634 /** Negotiated minor version */
635 unsigned minor;
636
637 /** Backing dev info */
638 struct backing_dev_info bdi;
639
640 /** Entry on the fuse_conn_list */
641 struct list_head entry;
642
643 /** Device ID from super block */
644 dev_t dev;
645
646 /** Dentries in the control filesystem */
647 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
648
649 /** number of dentries used in the above array */
650 int ctl_ndents;
651
652 /** Key for lock owner ID scrambling */
653 u32 scramble_key[4];
654
655 /** Reserved request for the DESTROY message */
656 struct fuse_req *destroy_req;
657
658 /** Version counter for attribute changes */
659 u64 attr_version;
660
661 /** Called on final put */
662 void (*release)(struct fuse_conn *);
663
664 /** Super block for this connection. */
665 struct super_block *sb;
666
667 /** Read/write semaphore to hold when accessing sb. */
668 struct rw_semaphore killsb;
669
670 /** List of device instances belonging to this connection */
671 struct list_head devices;
672 };
673
get_fuse_conn_super(struct super_block * sb)674 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
675 {
676 return sb->s_fs_info;
677 }
678
get_fuse_conn(struct inode * inode)679 static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
680 {
681 return get_fuse_conn_super(inode->i_sb);
682 }
683
get_fuse_inode(struct inode * inode)684 static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
685 {
686 return container_of(inode, struct fuse_inode, inode);
687 }
688
get_node_id(struct inode * inode)689 static inline u64 get_node_id(struct inode *inode)
690 {
691 return get_fuse_inode(inode)->nodeid;
692 }
693
694 /** Device operations */
695 extern const struct file_operations fuse_dev_operations;
696
697 extern const struct dentry_operations fuse_dentry_operations;
698 extern const struct dentry_operations fuse_root_dentry_operations;
699
700 /**
701 * Inode to nodeid comparison.
702 */
703 int fuse_inode_eq(struct inode *inode, void *_nodeidp);
704
705 /**
706 * Get a filled in inode
707 */
708 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
709 int generation, struct fuse_attr *attr,
710 u64 attr_valid, u64 attr_version);
711
712 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
713 struct fuse_entry_out *outarg, struct inode **inode);
714
715 /**
716 * Send FORGET command
717 */
718 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
719 u64 nodeid, u64 nlookup);
720
721 struct fuse_forget_link *fuse_alloc_forget(void);
722
723 /* Used by READDIRPLUS */
724 void fuse_force_forget(struct file *file, u64 nodeid);
725
726 /**
727 * Initialize READ or READDIR request
728 */
729 void fuse_read_fill(struct fuse_req *req, struct file *file,
730 loff_t pos, size_t count, int opcode);
731
732 /**
733 * Send OPEN or OPENDIR request
734 */
735 int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
736
737 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
738 struct fuse_file *fuse_file_get(struct fuse_file *ff);
739 void fuse_file_free(struct fuse_file *ff);
740 void fuse_finish_open(struct inode *inode, struct file *file);
741
742 void fuse_sync_release(struct fuse_file *ff, int flags);
743
744 /**
745 * Send RELEASE or RELEASEDIR request
746 */
747 void fuse_release_common(struct file *file, int opcode);
748
749 /**
750 * Send FSYNC or FSYNCDIR request
751 */
752 int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
753 int datasync, int isdir);
754
755 /**
756 * Notify poll wakeup
757 */
758 int fuse_notify_poll_wakeup(struct fuse_conn *fc,
759 struct fuse_notify_poll_wakeup_out *outarg);
760
761 /**
762 * Initialize file operations on a regular file
763 */
764 void fuse_init_file_inode(struct inode *inode);
765
766 /**
767 * Initialize inode operations on regular files and special files
768 */
769 void fuse_init_common(struct inode *inode);
770
771 /**
772 * Initialize inode and file operations on a directory
773 */
774 void fuse_init_dir(struct inode *inode);
775
776 /**
777 * Initialize inode operations on a symlink
778 */
779 void fuse_init_symlink(struct inode *inode);
780
781 /**
782 * Change attributes of an inode
783 */
784 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
785 u64 attr_valid, u64 attr_version);
786
787 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
788 u64 attr_valid);
789
790 /**
791 * Initialize the client device
792 */
793 int fuse_dev_init(void);
794
795 /**
796 * Cleanup the client device
797 */
798 void fuse_dev_cleanup(void);
799
800 int fuse_ctl_init(void);
801 void __exit fuse_ctl_cleanup(void);
802
803 /**
804 * Allocate a request
805 */
806 struct fuse_req *fuse_request_alloc(unsigned npages);
807
808 struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
809
810 /**
811 * Free a request
812 */
813 void fuse_request_free(struct fuse_req *req);
814
815 /**
816 * Get a request, may fail with -ENOMEM,
817 * caller should specify # elements in req->pages[] explicitly
818 */
819 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
820 struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
821 unsigned npages);
822
823 /*
824 * Increment reference count on request
825 */
826 void __fuse_get_request(struct fuse_req *req);
827
828 /**
829 * Gets a requests for a file operation, always succeeds
830 */
831 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
832 struct file *file);
833
834 /**
835 * Decrement reference count of a request. If count goes to zero free
836 * the request.
837 */
838 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
839
840 /**
841 * Send a request (synchronous)
842 */
843 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
844
845 /**
846 * Simple request sending that does request allocation and freeing
847 */
848 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
849
850 /**
851 * Send a request in the background
852 */
853 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
854
855 void fuse_request_send_background_locked(struct fuse_conn *fc,
856 struct fuse_req *req);
857
858 /* Abort all requests */
859 void fuse_abort_conn(struct fuse_conn *fc);
860
861 /**
862 * Invalidate inode attributes
863 */
864 void fuse_invalidate_attr(struct inode *inode);
865
866 void fuse_invalidate_entry_cache(struct dentry *entry);
867
868 void fuse_invalidate_atime(struct inode *inode);
869
870 /**
871 * Acquire reference to fuse_conn
872 */
873 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
874
875 /**
876 * Initialize fuse_conn
877 */
878 void fuse_conn_init(struct fuse_conn *fc);
879
880 /**
881 * Release reference to fuse_conn
882 */
883 void fuse_conn_put(struct fuse_conn *fc);
884
885 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc);
886 void fuse_dev_free(struct fuse_dev *fud);
887
888 /**
889 * Add connection to control filesystem
890 */
891 int fuse_ctl_add_conn(struct fuse_conn *fc);
892
893 /**
894 * Remove connection from control filesystem
895 */
896 void fuse_ctl_remove_conn(struct fuse_conn *fc);
897
898 /**
899 * Is file type valid?
900 */
901 int fuse_valid_type(int m);
902
903 /**
904 * Is current process allowed to perform filesystem operation?
905 */
906 int fuse_allow_current_process(struct fuse_conn *fc);
907
908 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
909
910 void fuse_update_ctime(struct inode *inode);
911
912 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
913 struct file *file, bool *refreshed);
914
915 void fuse_flush_writepages(struct inode *inode);
916
917 void fuse_set_nowrite(struct inode *inode);
918 void fuse_release_nowrite(struct inode *inode);
919
920 u64 fuse_get_attr_version(struct fuse_conn *fc);
921
922 /**
923 * File-system tells the kernel to invalidate cache for the given node id.
924 */
925 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
926 loff_t offset, loff_t len);
927
928 /**
929 * File-system tells the kernel to invalidate parent attributes and
930 * the dentry matching parent/name.
931 *
932 * If the child_nodeid is non-zero and:
933 * - matches the inode number for the dentry matching parent/name,
934 * - is not a mount point
935 * - is a file or oan empty directory
936 * then the dentry is unhashed (d_delete()).
937 */
938 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
939 u64 child_nodeid, struct qstr *name);
940
941 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
942 bool isdir);
943
944 /**
945 * fuse_direct_io() flags
946 */
947
948 /** If set, it is WRITE; otherwise - READ */
949 #define FUSE_DIO_WRITE (1 << 0)
950
951 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
952 #define FUSE_DIO_CUSE (1 << 1)
953
954 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
955 loff_t *ppos, int flags);
956 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
957 unsigned int flags);
958 long fuse_ioctl_common(struct file *file, unsigned int cmd,
959 unsigned long arg, unsigned int flags);
960 unsigned fuse_file_poll(struct file *file, poll_table *wait);
961 int fuse_dev_release(struct inode *inode, struct file *file);
962
963 bool fuse_write_update_size(struct inode *inode, loff_t pos);
964
965 int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
966 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
967
968 int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
969 struct file *file);
970
971 void fuse_set_initialized(struct fuse_conn *fc);
972
973 void fuse_unlock_inode(struct inode *inode);
974 void fuse_lock_inode(struct inode *inode);
975
976 int fuse_setxattr(struct inode *inode, const char *name, const void *value,
977 size_t size, int flags);
978 ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
979 size_t size);
980 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
981 int fuse_removexattr(struct inode *inode, const char *name);
982 extern const struct xattr_handler *fuse_xattr_handlers[];
983 extern const struct xattr_handler *fuse_acl_xattr_handlers[];
984
985 struct posix_acl;
986 struct posix_acl *fuse_get_acl(struct inode *inode, int type);
987 int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
988
989 #endif /* _FS_FUSE_I_H */
990