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