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 */
52extern struct list_head fuse_conn_list;
53
54/** Global mutex protecting fuse_conn_list and the control filesystem */
55extern struct mutex fuse_mutex;
56
57/** Module parameters */
58extern unsigned max_user_bgreq;
59extern unsigned max_user_congthresh;
60
61/* One forget request */
62struct fuse_forget_link {
63	struct fuse_forget_one forget_one;
64	struct fuse_forget_link *next;
65};
66
67/** FUSE inode */
68struct 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 */
116enum {
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
125struct fuse_conn;
126
127/** FUSE specific file data */
128struct 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 */
164struct fuse_in_arg {
165	unsigned size;
166	const void *value;
167};
168
169/** The request input */
170struct 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 */
185struct fuse_arg {
186	unsigned size;
187	void *value;
188};
189
190/** The request output */
191struct 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 */
221struct fuse_page_desc {
222	unsigned int length;
223	unsigned int offset;
224};
225
226struct 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 */
246enum 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) */
256struct 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 */
281struct 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 */
399struct 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
628static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
629{
630	return sb->s_fs_info;
631}
632
633static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
634{
635	return get_fuse_conn_super(inode->i_sb);
636}
637
638static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
639{
640	return container_of(inode, struct fuse_inode, inode);
641}
642
643static inline u64 get_node_id(struct inode *inode)
644{
645	return get_fuse_inode(inode)->nodeid;
646}
647
648/** Device operations */
649extern const struct file_operations fuse_dev_operations;
650
651extern const struct dentry_operations fuse_dentry_operations;
652
653/**
654 * Inode to nodeid comparison.
655 */
656int fuse_inode_eq(struct inode *inode, void *_nodeidp);
657
658/**
659 * Get a filled in inode
660 */
661struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
662			int generation, struct fuse_attr *attr,
663			u64 attr_valid, u64 attr_version);
664
665int 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 */
671void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
672		       u64 nodeid, u64 nlookup);
673
674struct fuse_forget_link *fuse_alloc_forget(void);
675
676/* Used by READDIRPLUS */
677void fuse_force_forget(struct file *file, u64 nodeid);
678
679/**
680 * Initialize READ or READDIR request
681 */
682void 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 */
688int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
689
690struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
691struct fuse_file *fuse_file_get(struct fuse_file *ff);
692void fuse_file_free(struct fuse_file *ff);
693void fuse_finish_open(struct inode *inode, struct file *file);
694
695void fuse_sync_release(struct fuse_file *ff, int flags);
696
697/**
698 * Send RELEASE or RELEASEDIR request
699 */
700void fuse_release_common(struct file *file, int opcode);
701
702/**
703 * Send FSYNC or FSYNCDIR request
704 */
705int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
706		      int datasync, int isdir);
707
708/**
709 * Notify poll wakeup
710 */
711int 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 */
717void fuse_init_file_inode(struct inode *inode);
718
719/**
720 * Initialize inode operations on regular files and special files
721 */
722void fuse_init_common(struct inode *inode);
723
724/**
725 * Initialize inode and file operations on a directory
726 */
727void fuse_init_dir(struct inode *inode);
728
729/**
730 * Initialize inode operations on a symlink
731 */
732void fuse_init_symlink(struct inode *inode);
733
734/**
735 * Change attributes of an inode
736 */
737void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
738			    u64 attr_valid, u64 attr_version);
739
740void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
741				   u64 attr_valid);
742
743/**
744 * Initialize the client device
745 */
746int fuse_dev_init(void);
747
748/**
749 * Cleanup the client device
750 */
751void fuse_dev_cleanup(void);
752
753int fuse_ctl_init(void);
754void __exit fuse_ctl_cleanup(void);
755
756/**
757 * Allocate a request
758 */
759struct fuse_req *fuse_request_alloc(unsigned npages);
760
761struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
762
763/**
764 * Free a request
765 */
766void 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 */
772struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
773struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
774					     unsigned npages);
775
776/*
777 * Increment reference count on request
778 */
779void __fuse_get_request(struct fuse_req *req);
780
781/**
782 * Gets a requests for a file operation, always succeeds
783 */
784struct 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 */
791void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
792
793/**
794 * Send a request (synchronous)
795 */
796void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
797
798/**
799 * Simple request sending that does request allocation and freeing
800 */
801ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
802
803/**
804 * Send a request in the background
805 */
806void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
807
808void fuse_request_send_background_locked(struct fuse_conn *fc,
809					 struct fuse_req *req);
810
811/* Abort all requests */
812void fuse_abort_conn(struct fuse_conn *fc);
813
814/**
815 * Invalidate inode attributes
816 */
817void fuse_invalidate_attr(struct inode *inode);
818
819void fuse_invalidate_entry_cache(struct dentry *entry);
820
821void fuse_invalidate_atime(struct inode *inode);
822
823/**
824 * Acquire reference to fuse_conn
825 */
826struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
827
828/**
829 * Initialize fuse_conn
830 */
831void fuse_conn_init(struct fuse_conn *fc);
832
833/**
834 * Release reference to fuse_conn
835 */
836void fuse_conn_put(struct fuse_conn *fc);
837
838/**
839 * Add connection to control filesystem
840 */
841int fuse_ctl_add_conn(struct fuse_conn *fc);
842
843/**
844 * Remove connection from control filesystem
845 */
846void fuse_ctl_remove_conn(struct fuse_conn *fc);
847
848/**
849 * Is file type valid?
850 */
851int fuse_valid_type(int m);
852
853/**
854 * Is current process allowed to perform filesystem operation?
855 */
856int fuse_allow_current_process(struct fuse_conn *fc);
857
858u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
859
860int fuse_update_attributes(struct inode *inode, struct kstat *stat,
861			   struct file *file, bool *refreshed);
862
863void fuse_flush_writepages(struct inode *inode);
864
865void fuse_set_nowrite(struct inode *inode);
866void fuse_release_nowrite(struct inode *inode);
867
868u64 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 */
873int 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 */
886int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
887			     u64 child_nodeid, struct qstr *name);
888
889int 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
902ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
903		       loff_t *ppos, int flags);
904long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
905		   unsigned int flags);
906long fuse_ioctl_common(struct file *file, unsigned int cmd,
907		       unsigned long arg, unsigned int flags);
908unsigned fuse_file_poll(struct file *file, poll_table *wait);
909int fuse_dev_release(struct inode *inode, struct file *file);
910
911bool fuse_write_update_size(struct inode *inode, loff_t pos);
912
913int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
914int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
915
916int fuse_do_setattr(struct inode *inode, struct iattr *attr,
917		    struct file *file);
918
919void fuse_set_initialized(struct fuse_conn *fc);
920
921#endif /* _FS_FUSE_I_H */
922