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 #include <linux/user_namespace.h>
30
31 /** Max number of pages that can be used in a single read request */
32 #define FUSE_MAX_PAGES_PER_REQ 32
33
34 /** Bias for fi->writectr, meaning new writepages must not be sent */
35 #define FUSE_NOWRITE INT_MIN
36
37 /** It could be as large as PATH_MAX, but would that have any uses? */
38 #define FUSE_NAME_MAX 1024
39
40 /** Number of dentries for each connection in the control filesystem */
41 #define FUSE_CTL_NUM_DENTRIES 5
42
43 /** Number of page pointers embedded in fuse_req */
44 #define FUSE_REQ_INLINE_PAGES 1
45
46 /** List of active connections */
47 extern struct list_head fuse_conn_list;
48
49 /** Global mutex protecting fuse_conn_list and the control filesystem */
50 extern struct mutex fuse_mutex;
51
52 /** Module parameters */
53 extern unsigned max_user_bgreq;
54 extern unsigned max_user_congthresh;
55
56 /* One forget request */
57 struct fuse_forget_link {
58 struct fuse_forget_one forget_one;
59 struct fuse_forget_link *next;
60 };
61
62 /** FUSE inode */
63 struct fuse_inode {
64 /** Inode data */
65 struct inode inode;
66
67 /** Unique ID, which identifies the inode between userspace
68 * and kernel */
69 u64 nodeid;
70
71 /** Number of lookups on this inode */
72 u64 nlookup;
73
74 /** The request used for sending the FORGET message */
75 struct fuse_forget_link *forget;
76
77 /** Time in jiffies until the file attributes are valid */
78 u64 i_time;
79
80 /** The sticky bit in inode->i_mode may have been removed, so
81 preserve the original mode */
82 umode_t orig_i_mode;
83
84 /** 64 bit inode number */
85 u64 orig_ino;
86
87 /** Version of last attribute change */
88 u64 attr_version;
89
90 /** Files usable in writepage. Protected by fc->lock */
91 struct list_head write_files;
92
93 /** Writepages pending on truncate or fsync */
94 struct list_head queued_writes;
95
96 /** Number of sent writes, a negative bias (FUSE_NOWRITE)
97 * means more writes are blocked */
98 int writectr;
99
100 /** Waitq for writepage completion */
101 wait_queue_head_t page_waitq;
102
103 /** List of writepage requestst (pending or sent) */
104 struct list_head writepages;
105
106 /** Miscellaneous bits describing inode state */
107 unsigned long state;
108
109 /** Lock for serializing lookup and readdir for back compatibility*/
110 struct mutex mutex;
111 };
112
113 /** FUSE inode state bits */
114 enum {
115 /** Advise readdirplus */
116 FUSE_I_ADVISE_RDPLUS,
117 /** Initialized with readdirplus */
118 FUSE_I_INIT_RDPLUS,
119 /** An operation changing file size is in progress */
120 FUSE_I_SIZE_UNSTABLE,
121 };
122
123 struct fuse_conn;
124
125 /** FUSE specific file data */
126 struct fuse_file {
127 /** Fuse connection for this file */
128 struct fuse_conn *fc;
129
130 /** Request reserved for flush and release */
131 struct fuse_req *reserved_req;
132
133 /** Kernel file handle guaranteed to be unique */
134 u64 kh;
135
136 /** File handle used by userspace */
137 u64 fh;
138
139 /** Node id of this file */
140 u64 nodeid;
141
142 /** Refcount */
143 refcount_t count;
144
145 /** FOPEN_* flags returned by open */
146 u32 open_flags;
147
148 /** Entry on inode's write_files list */
149 struct list_head write_entry;
150
151 /** RB node to be linked on fuse_conn->polled_files */
152 struct rb_node polled_node;
153
154 /** Wait queue head for poll */
155 wait_queue_head_t poll_wait;
156
157 /** Has flock been performed on this file? */
158 bool flock:1;
159 };
160
161 /** One input argument of a request */
162 struct fuse_in_arg {
163 unsigned size;
164 const void *value;
165 };
166
167 /** The request input */
168 struct fuse_in {
169 /** The request header */
170 struct fuse_in_header h;
171
172 /** True if the data for the last argument is in req->pages */
173 unsigned argpages:1;
174
175 /** Number of arguments */
176 unsigned numargs;
177
178 /** Array of arguments */
179 struct fuse_in_arg args[3];
180 };
181
182 /** One output argument of a request */
183 struct fuse_arg {
184 unsigned size;
185 void *value;
186 };
187
188 /** The request output */
189 struct fuse_out {
190 /** Header returned from userspace */
191 struct fuse_out_header h;
192
193 /*
194 * The following bitfields are not changed during the request
195 * processing
196 */
197
198 /** Last argument is variable length (can be shorter than
199 arg->size) */
200 unsigned argvar:1;
201
202 /** Last argument is a list of pages to copy data to */
203 unsigned argpages:1;
204
205 /** Zero partially or not copied pages */
206 unsigned page_zeroing:1;
207
208 /** Pages may be replaced with new ones */
209 unsigned page_replace:1;
210
211 /** Number or arguments */
212 unsigned numargs;
213
214 /** Array of arguments */
215 struct fuse_arg args[2];
216 };
217
218 /** FUSE page descriptor */
219 struct fuse_page_desc {
220 unsigned int length;
221 unsigned int offset;
222 };
223
224 struct fuse_args {
225 struct {
226 struct {
227 uint32_t opcode;
228 uint64_t nodeid;
229 } h;
230 unsigned numargs;
231 struct fuse_in_arg args[3];
232
233 } in;
234 struct {
235 unsigned argvar:1;
236 unsigned numargs;
237 struct fuse_arg args[2];
238 } out;
239 };
240
241 #define FUSE_ARGS(args) struct fuse_args args = {}
242
243 /** The request IO state (for asynchronous processing) */
244 struct fuse_io_priv {
245 struct kref refcnt;
246 int async;
247 spinlock_t lock;
248 unsigned reqs;
249 ssize_t bytes;
250 size_t size;
251 __u64 offset;
252 bool write;
253 bool should_dirty;
254 int err;
255 struct kiocb *iocb;
256 struct completion *done;
257 bool blocking;
258 };
259
260 #define FUSE_IO_PRIV_SYNC(i) \
261 { \
262 .refcnt = KREF_INIT(1), \
263 .async = 0, \
264 .iocb = i, \
265 }
266
267 /**
268 * Request flags
269 *
270 * FR_ISREPLY: set if the request has reply
271 * FR_FORCE: force sending of the request even if interrupted
272 * FR_BACKGROUND: request is sent in the background
273 * FR_WAITING: request is counted as "waiting"
274 * FR_ABORTED: the request was aborted
275 * FR_INTERRUPTED: the request has been interrupted
276 * FR_LOCKED: data is being copied to/from the request
277 * FR_PENDING: request is not yet in userspace
278 * FR_SENT: request is in userspace, waiting for an answer
279 * FR_FINISHED: request is finished
280 * FR_PRIVATE: request is on private list
281 */
282 enum fuse_req_flag {
283 FR_ISREPLY,
284 FR_FORCE,
285 FR_BACKGROUND,
286 FR_WAITING,
287 FR_ABORTED,
288 FR_INTERRUPTED,
289 FR_LOCKED,
290 FR_PENDING,
291 FR_SENT,
292 FR_FINISHED,
293 FR_PRIVATE,
294 };
295
296 /**
297 * A request to the client
298 *
299 * .waitq.lock protects the following fields:
300 * - FR_ABORTED
301 * - FR_LOCKED (may also be modified under fc->lock, tested under both)
302 */
303 struct fuse_req {
304 /** This can be on either pending processing or io lists in
305 fuse_conn */
306 struct list_head list;
307
308 /** Entry on the interrupts list */
309 struct list_head intr_entry;
310
311 /** refcount */
312 refcount_t count;
313
314 /** Unique ID for the interrupt request */
315 u64 intr_unique;
316
317 /* Request flags, updated with test/set/clear_bit() */
318 unsigned long flags;
319
320 /** The request input */
321 struct fuse_in in;
322
323 /** The request output */
324 struct fuse_out out;
325
326 /** Used to wake up the task waiting for completion of request*/
327 wait_queue_head_t waitq;
328
329 /** Data for asynchronous requests */
330 union {
331 struct {
332 struct fuse_release_in in;
333 struct inode *inode;
334 } release;
335 struct fuse_init_in init_in;
336 struct fuse_init_out init_out;
337 struct cuse_init_in cuse_init_in;
338 struct {
339 struct fuse_read_in in;
340 u64 attr_ver;
341 } read;
342 struct {
343 struct fuse_write_in in;
344 struct fuse_write_out out;
345 struct fuse_req *next;
346 } write;
347 struct fuse_notify_retrieve_in retrieve_in;
348 } misc;
349
350 /** page vector */
351 struct page **pages;
352
353 /** page-descriptor vector */
354 struct fuse_page_desc *page_descs;
355
356 /** size of the 'pages' array */
357 unsigned max_pages;
358
359 /** inline page vector */
360 struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
361
362 /** inline page-descriptor vector */
363 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
364
365 /** number of pages in vector */
366 unsigned num_pages;
367
368 /** File used in the request (or NULL) */
369 struct fuse_file *ff;
370
371 /** Inode used in the request or NULL */
372 struct inode *inode;
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 refcount_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 /** The pid namespace for this mount */
468 struct pid_namespace *pid_ns;
469
470 /** The user namespace for this mount */
471 struct user_namespace *user_ns;
472
473 /** Maximum read size */
474 unsigned max_read;
475
476 /** Maximum write size */
477 unsigned max_write;
478
479 /** Input queue */
480 struct fuse_iqueue iq;
481
482 /** The next unique kernel file handle */
483 u64 khctr;
484
485 /** rbtree of fuse_files waiting for poll events indexed by ph */
486 struct rb_root polled_files;
487
488 /** Maximum number of outstanding background requests */
489 unsigned max_background;
490
491 /** Number of background requests at which congestion starts */
492 unsigned congestion_threshold;
493
494 /** Number of requests currently in the background */
495 unsigned num_background;
496
497 /** Number of background requests currently queued for userspace */
498 unsigned active_background;
499
500 /** The list of background requests set aside for later queuing */
501 struct list_head bg_queue;
502
503 /** Flag indicating that INIT reply has been received. Allocating
504 * any fuse request will be suspended until the flag is set */
505 int initialized;
506
507 /** Flag indicating if connection is blocked. This will be
508 the case before the INIT reply is received, and if there
509 are too many outstading backgrounds requests */
510 int blocked;
511
512 /** waitq for blocked connection */
513 wait_queue_head_t blocked_waitq;
514
515 /** waitq for reserved requests */
516 wait_queue_head_t reserved_req_waitq;
517
518 /** Connection established, cleared on umount, connection
519 abort and device release */
520 unsigned connected;
521
522 /** Connection aborted via sysfs */
523 bool aborted;
524
525 /** Connection failed (version mismatch). Cannot race with
526 setting other bitfields since it is only set once in INIT
527 reply, before any other request, and never cleared */
528 unsigned conn_error:1;
529
530 /** Connection successful. Only set in INIT */
531 unsigned conn_init:1;
532
533 /** Do readpages asynchronously? Only set in INIT */
534 unsigned async_read:1;
535
536 /** Return an unique read error after abort. Only set in INIT */
537 unsigned abort_err:1;
538
539 /** Do not send separate SETATTR request before open(O_TRUNC) */
540 unsigned atomic_o_trunc:1;
541
542 /** Filesystem supports NFS exporting. Only set in INIT */
543 unsigned export_support:1;
544
545 /** write-back cache policy (default is write-through) */
546 unsigned writeback_cache:1;
547
548 /** allow parallel lookups and readdir (default is serialized) */
549 unsigned parallel_dirops:1;
550
551 /** handle fs handles killing suid/sgid/cap on write/chown/trunc */
552 unsigned handle_killpriv:1;
553
554 /*
555 * The following bitfields are only for optimization purposes
556 * and hence races in setting them will not cause malfunction
557 */
558
559 /** Is open/release not implemented by fs? */
560 unsigned no_open:1;
561
562 /** Is fsync not implemented by fs? */
563 unsigned no_fsync:1;
564
565 /** Is fsyncdir not implemented by fs? */
566 unsigned no_fsyncdir:1;
567
568 /** Is flush not implemented by fs? */
569 unsigned no_flush:1;
570
571 /** Is setxattr not implemented by fs? */
572 unsigned no_setxattr:1;
573
574 /** Is getxattr not implemented by fs? */
575 unsigned no_getxattr:1;
576
577 /** Is listxattr not implemented by fs? */
578 unsigned no_listxattr:1;
579
580 /** Is removexattr not implemented by fs? */
581 unsigned no_removexattr:1;
582
583 /** Are posix file locking primitives not implemented by fs? */
584 unsigned no_lock:1;
585
586 /** Is access not implemented by fs? */
587 unsigned no_access:1;
588
589 /** Is create not implemented by fs? */
590 unsigned no_create:1;
591
592 /** Is interrupt not implemented by fs? */
593 unsigned no_interrupt:1;
594
595 /** Is bmap not implemented by fs? */
596 unsigned no_bmap:1;
597
598 /** Is poll not implemented by fs? */
599 unsigned no_poll:1;
600
601 /** Do multi-page cached writes */
602 unsigned big_writes:1;
603
604 /** Don't apply umask to creation modes */
605 unsigned dont_mask:1;
606
607 /** Are BSD file locking primitives not implemented by fs? */
608 unsigned no_flock:1;
609
610 /** Is fallocate not implemented by fs? */
611 unsigned no_fallocate:1;
612
613 /** Is rename with flags implemented by fs? */
614 unsigned no_rename2:1;
615
616 /** Use enhanced/automatic page cache invalidation. */
617 unsigned auto_inval_data:1;
618
619 /** Does the filesystem support readdirplus? */
620 unsigned do_readdirplus:1;
621
622 /** Does the filesystem want adaptive readdirplus? */
623 unsigned readdirplus_auto:1;
624
625 /** Does the filesystem support asynchronous direct-IO submission? */
626 unsigned async_dio:1;
627
628 /** Is lseek not implemented by fs? */
629 unsigned no_lseek:1;
630
631 /** Does the filesystem support posix acls? */
632 unsigned posix_acl:1;
633
634 /** Check permissions based on the file mode or not? */
635 unsigned default_permissions:1;
636
637 /** Allow other than the mounter user to access the filesystem ? */
638 unsigned allow_other:1;
639
640 /** The number of requests waiting for completion */
641 atomic_t num_waiting;
642
643 /** Negotiated minor version */
644 unsigned minor;
645
646 /** Entry on the fuse_conn_list */
647 struct list_head entry;
648
649 /** Device ID from super block */
650 dev_t dev;
651
652 /** Dentries in the control filesystem */
653 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
654
655 /** number of dentries used in the above array */
656 int ctl_ndents;
657
658 /** Key for lock owner ID scrambling */
659 u32 scramble_key[4];
660
661 /** Reserved request for the DESTROY message */
662 struct fuse_req *destroy_req;
663
664 /** Version counter for attribute changes */
665 u64 attr_version;
666
667 /** Called on final put */
668 void (*release)(struct fuse_conn *);
669
670 /** Super block for this connection. */
671 struct super_block *sb;
672
673 /** Read/write semaphore to hold when accessing sb. */
674 struct rw_semaphore killsb;
675
676 /** List of device instances belonging to this connection */
677 struct list_head devices;
678 };
679
get_fuse_conn_super(struct super_block * sb)680 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
681 {
682 return sb->s_fs_info;
683 }
684
get_fuse_conn(struct inode * inode)685 static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
686 {
687 return get_fuse_conn_super(inode->i_sb);
688 }
689
get_fuse_inode(struct inode * inode)690 static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
691 {
692 return container_of(inode, struct fuse_inode, inode);
693 }
694
get_node_id(struct inode * inode)695 static inline u64 get_node_id(struct inode *inode)
696 {
697 return get_fuse_inode(inode)->nodeid;
698 }
699
700 /** Device operations */
701 extern const struct file_operations fuse_dev_operations;
702
703 extern const struct dentry_operations fuse_dentry_operations;
704 extern const struct dentry_operations fuse_root_dentry_operations;
705
706 /**
707 * Inode to nodeid comparison.
708 */
709 int fuse_inode_eq(struct inode *inode, void *_nodeidp);
710
711 /**
712 * Get a filled in inode
713 */
714 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
715 int generation, struct fuse_attr *attr,
716 u64 attr_valid, u64 attr_version);
717
718 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
719 struct fuse_entry_out *outarg, struct inode **inode);
720
721 /**
722 * Send FORGET command
723 */
724 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
725 u64 nodeid, u64 nlookup);
726
727 struct fuse_forget_link *fuse_alloc_forget(void);
728
729 /* Used by READDIRPLUS */
730 void fuse_force_forget(struct file *file, u64 nodeid);
731
732 /**
733 * Initialize READ or READDIR request
734 */
735 void fuse_read_fill(struct fuse_req *req, struct file *file,
736 loff_t pos, size_t count, int opcode);
737
738 /**
739 * Send OPEN or OPENDIR request
740 */
741 int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
742
743 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
744 void fuse_file_free(struct fuse_file *ff);
745 void fuse_finish_open(struct inode *inode, struct file *file);
746
747 void fuse_sync_release(struct fuse_file *ff, int flags);
748
749 /**
750 * Send RELEASE or RELEASEDIR request
751 */
752 void fuse_release_common(struct file *file, int opcode);
753
754 /**
755 * Send FSYNC or FSYNCDIR request
756 */
757 int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
758 int datasync, int isdir);
759
760 /**
761 * Notify poll wakeup
762 */
763 int fuse_notify_poll_wakeup(struct fuse_conn *fc,
764 struct fuse_notify_poll_wakeup_out *outarg);
765
766 /**
767 * Initialize file operations on a regular file
768 */
769 void fuse_init_file_inode(struct inode *inode);
770
771 /**
772 * Initialize inode operations on regular files and special files
773 */
774 void fuse_init_common(struct inode *inode);
775
776 /**
777 * Initialize inode and file operations on a directory
778 */
779 void fuse_init_dir(struct inode *inode);
780
781 /**
782 * Initialize inode operations on a symlink
783 */
784 void fuse_init_symlink(struct inode *inode);
785
786 /**
787 * Change attributes of an inode
788 */
789 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
790 u64 attr_valid, u64 attr_version);
791
792 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
793 u64 attr_valid);
794
795 /**
796 * Initialize the client device
797 */
798 int fuse_dev_init(void);
799
800 /**
801 * Cleanup the client device
802 */
803 void fuse_dev_cleanup(void);
804
805 int fuse_ctl_init(void);
806 void __exit fuse_ctl_cleanup(void);
807
808 /**
809 * Allocate a request
810 */
811 struct fuse_req *fuse_request_alloc(unsigned npages);
812
813 struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
814
815 /**
816 * Free a request
817 */
818 void fuse_request_free(struct fuse_req *req);
819
820 /**
821 * Get a request, may fail with -ENOMEM,
822 * caller should specify # elements in req->pages[] explicitly
823 */
824 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
825 struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
826 unsigned npages);
827
828 /*
829 * Increment reference count on request
830 */
831 void __fuse_get_request(struct fuse_req *req);
832
833 /**
834 * Gets a requests for a file operation, always succeeds
835 */
836 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
837 struct file *file);
838
839 /**
840 * Decrement reference count of a request. If count goes to zero free
841 * the request.
842 */
843 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
844
845 /**
846 * Send a request (synchronous)
847 */
848 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
849
850 /**
851 * Simple request sending that does request allocation and freeing
852 */
853 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
854
855 /**
856 * Send a request in the background
857 */
858 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
859
860 void fuse_request_send_background_locked(struct fuse_conn *fc,
861 struct fuse_req *req);
862
863 /* Abort all requests */
864 void fuse_abort_conn(struct fuse_conn *fc, bool is_abort);
865 void fuse_wait_aborted(struct fuse_conn *fc);
866
867 /**
868 * Invalidate inode attributes
869 */
870 void fuse_invalidate_attr(struct inode *inode);
871
872 void fuse_invalidate_entry_cache(struct dentry *entry);
873
874 void fuse_invalidate_atime(struct inode *inode);
875
876 /**
877 * Acquire reference to fuse_conn
878 */
879 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
880
881 /**
882 * Initialize fuse_conn
883 */
884 void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns);
885
886 /**
887 * Release reference to fuse_conn
888 */
889 void fuse_conn_put(struct fuse_conn *fc);
890
891 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc);
892 void fuse_dev_free(struct fuse_dev *fud);
893
894 /**
895 * Add connection to control filesystem
896 */
897 int fuse_ctl_add_conn(struct fuse_conn *fc);
898
899 /**
900 * Remove connection from control filesystem
901 */
902 void fuse_ctl_remove_conn(struct fuse_conn *fc);
903
904 /**
905 * Is file type valid?
906 */
907 int fuse_valid_type(int m);
908
909 /**
910 * Is current process allowed to perform filesystem operation?
911 */
912 int fuse_allow_current_process(struct fuse_conn *fc);
913
914 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
915
916 void fuse_update_ctime(struct inode *inode);
917
918 int fuse_update_attributes(struct inode *inode, struct file *file);
919
920 void fuse_flush_writepages(struct inode *inode);
921
922 void fuse_set_nowrite(struct inode *inode);
923 void fuse_release_nowrite(struct inode *inode);
924
925 u64 fuse_get_attr_version(struct fuse_conn *fc);
926
927 /**
928 * File-system tells the kernel to invalidate cache for the given node id.
929 */
930 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
931 loff_t offset, loff_t len);
932
933 /**
934 * File-system tells the kernel to invalidate parent attributes and
935 * the dentry matching parent/name.
936 *
937 * If the child_nodeid is non-zero and:
938 * - matches the inode number for the dentry matching parent/name,
939 * - is not a mount point
940 * - is a file or oan empty directory
941 * then the dentry is unhashed (d_delete()).
942 */
943 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
944 u64 child_nodeid, struct qstr *name);
945
946 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
947 bool isdir);
948
949 /**
950 * fuse_direct_io() flags
951 */
952
953 /** If set, it is WRITE; otherwise - READ */
954 #define FUSE_DIO_WRITE (1 << 0)
955
956 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
957 #define FUSE_DIO_CUSE (1 << 1)
958
959 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
960 loff_t *ppos, int flags);
961 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
962 unsigned int flags);
963 long fuse_ioctl_common(struct file *file, unsigned int cmd,
964 unsigned long arg, unsigned int flags);
965 __poll_t fuse_file_poll(struct file *file, poll_table *wait);
966 int fuse_dev_release(struct inode *inode, struct file *file);
967
968 bool fuse_write_update_size(struct inode *inode, loff_t pos);
969
970 int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
971 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
972
973 int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
974 struct file *file);
975
976 void fuse_set_initialized(struct fuse_conn *fc);
977
978 void fuse_unlock_inode(struct inode *inode, bool locked);
979 bool fuse_lock_inode(struct inode *inode);
980
981 int fuse_setxattr(struct inode *inode, const char *name, const void *value,
982 size_t size, int flags);
983 ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
984 size_t size);
985 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
986 int fuse_removexattr(struct inode *inode, const char *name);
987 extern const struct xattr_handler *fuse_xattr_handlers[];
988 extern const struct xattr_handler *fuse_acl_xattr_handlers[];
989 extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
990
991 struct posix_acl;
992 struct posix_acl *fuse_get_acl(struct inode *inode, int type);
993 int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
994
995 #endif /* _FS_FUSE_I_H */
996
