xref: /openbmc/linux/fs/fuse/fuse_i.h (revision ee89bd6b)
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  
26  /** Max number of pages that can be used in a single read request */
27  #define FUSE_MAX_PAGES_PER_REQ 32
28  
29  /** Bias for fi->writectr, meaning new writepages must not be sent */
30  #define FUSE_NOWRITE INT_MIN
31  
32  /** It could be as large as PATH_MAX, but would that have any uses? */
33  #define FUSE_NAME_MAX 1024
34  
35  /** Number of dentries for each connection in the control filesystem */
36  #define FUSE_CTL_NUM_DENTRIES 5
37  
38  /** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
39      module will check permissions based on the file mode.  Otherwise no
40      permission checking is done in the kernel */
41  #define FUSE_DEFAULT_PERMISSIONS (1 << 0)
42  
43  /** If the FUSE_ALLOW_OTHER flag is given, then not only the user
44      doing the mount will be allowed to access the filesystem */
45  #define FUSE_ALLOW_OTHER         (1 << 1)
46  
47  /** Number of page pointers embedded in fuse_req */
48  #define FUSE_REQ_INLINE_PAGES 1
49  
50  /** List of active connections */
51  extern struct list_head fuse_conn_list;
52  
53  /** Global mutex protecting fuse_conn_list and the control filesystem */
54  extern struct mutex fuse_mutex;
55  
56  /** Module parameters */
57  extern unsigned max_user_bgreq;
58  extern unsigned max_user_congthresh;
59  
60  /* One forget request */
61  struct fuse_forget_link {
62  	struct fuse_forget_one forget_one;
63  	struct fuse_forget_link *next;
64  };
65  
66  /** FUSE inode */
67  struct fuse_inode {
68  	/** Inode data */
69  	struct inode inode;
70  
71  	/** Unique ID, which identifies the inode between userspace
72  	 * and kernel */
73  	u64 nodeid;
74  
75  	/** Number of lookups on this inode */
76  	u64 nlookup;
77  
78  	/** The request used for sending the FORGET message */
79  	struct fuse_forget_link *forget;
80  
81  	/** Time in jiffies until the file attributes are valid */
82  	u64 i_time;
83  
84  	/** The sticky bit in inode->i_mode may have been removed, so
85  	    preserve the original mode */
86  	umode_t orig_i_mode;
87  
88  	/** 64 bit inode number */
89  	u64 orig_ino;
90  
91  	/** Version of last attribute change */
92  	u64 attr_version;
93  
94  	/** Files usable in writepage.  Protected by fc->lock */
95  	struct list_head write_files;
96  
97  	/** Writepages pending on truncate or fsync */
98  	struct list_head queued_writes;
99  
100  	/** Number of sent writes, a negative bias (FUSE_NOWRITE)
101  	 * means more writes are blocked */
102  	int writectr;
103  
104  	/** Waitq for writepage completion */
105  	wait_queue_head_t page_waitq;
106  
107  	/** List of writepage requestst (pending or sent) */
108  	struct list_head writepages;
109  
110  	/** Miscellaneous bits describing inode state */
111  	unsigned long state;
112  };
113  
114  /** FUSE inode state bits */
115  enum {
116  	/** Advise readdirplus  */
117  	FUSE_I_ADVISE_RDPLUS,
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[3];
213  };
214  
215  /** FUSE page descriptor */
216  struct fuse_page_desc {
217  	unsigned int length;
218  	unsigned int offset;
219  };
220  
221  /** The request state */
222  enum fuse_req_state {
223  	FUSE_REQ_INIT = 0,
224  	FUSE_REQ_PENDING,
225  	FUSE_REQ_READING,
226  	FUSE_REQ_SENT,
227  	FUSE_REQ_WRITING,
228  	FUSE_REQ_FINISHED
229  };
230  
231  /** The request IO state (for asynchronous processing) */
232  struct fuse_io_priv {
233  	int async;
234  	spinlock_t lock;
235  	unsigned reqs;
236  	ssize_t bytes;
237  	size_t size;
238  	__u64 offset;
239  	bool write;
240  	int err;
241  	struct kiocb *iocb;
242  	struct file *file;
243  };
244  
245  /**
246   * A request to the client
247   */
248  struct fuse_req {
249  	/** This can be on either pending processing or io lists in
250  	    fuse_conn */
251  	struct list_head list;
252  
253  	/** Entry on the interrupts list  */
254  	struct list_head intr_entry;
255  
256  	/** refcount */
257  	atomic_t count;
258  
259  	/** Unique ID for the interrupt request */
260  	u64 intr_unique;
261  
262  	/*
263  	 * The following bitfields are either set once before the
264  	 * request is queued or setting/clearing them is protected by
265  	 * fuse_conn->lock
266  	 */
267  
268  	/** True if the request has reply */
269  	unsigned isreply:1;
270  
271  	/** Force sending of the request even if interrupted */
272  	unsigned force:1;
273  
274  	/** The request was aborted */
275  	unsigned aborted:1;
276  
277  	/** Request is sent in the background */
278  	unsigned background:1;
279  
280  	/** The request has been interrupted */
281  	unsigned interrupted:1;
282  
283  	/** Data is being copied to/from the request */
284  	unsigned locked:1;
285  
286  	/** Request is counted as "waiting" */
287  	unsigned waiting:1;
288  
289  	/** State of the request */
290  	enum fuse_req_state state;
291  
292  	/** The request input */
293  	struct fuse_in in;
294  
295  	/** The request output */
296  	struct fuse_out out;
297  
298  	/** Used to wake up the task waiting for completion of request*/
299  	wait_queue_head_t waitq;
300  
301  	/** Data for asynchronous requests */
302  	union {
303  		struct {
304  			union {
305  				struct fuse_release_in in;
306  				struct work_struct work;
307  			};
308  			struct path path;
309  		} release;
310  		struct fuse_init_in init_in;
311  		struct fuse_init_out init_out;
312  		struct cuse_init_in cuse_init_in;
313  		struct {
314  			struct fuse_read_in in;
315  			u64 attr_ver;
316  		} read;
317  		struct {
318  			struct fuse_write_in in;
319  			struct fuse_write_out out;
320  		} write;
321  		struct fuse_notify_retrieve_in retrieve_in;
322  		struct fuse_lk_in lk_in;
323  	} misc;
324  
325  	/** page vector */
326  	struct page **pages;
327  
328  	/** page-descriptor vector */
329  	struct fuse_page_desc *page_descs;
330  
331  	/** size of the 'pages' array */
332  	unsigned max_pages;
333  
334  	/** inline page vector */
335  	struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
336  
337  	/** inline page-descriptor vector */
338  	struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
339  
340  	/** number of pages in vector */
341  	unsigned num_pages;
342  
343  	/** File used in the request (or NULL) */
344  	struct fuse_file *ff;
345  
346  	/** Inode used in the request or NULL */
347  	struct inode *inode;
348  
349  	/** AIO control block */
350  	struct fuse_io_priv *io;
351  
352  	/** Link on fi->writepages */
353  	struct list_head writepages_entry;
354  
355  	/** Request completion callback */
356  	void (*end)(struct fuse_conn *, struct fuse_req *);
357  
358  	/** Request is stolen from fuse_file->reserved_req */
359  	struct file *stolen_file;
360  };
361  
362  /**
363   * A Fuse connection.
364   *
365   * This structure is created, when the filesystem is mounted, and is
366   * destroyed, when the client device is closed and the filesystem is
367   * unmounted.
368   */
369  struct fuse_conn {
370  	/** Lock protecting accessess to  members of this structure */
371  	spinlock_t lock;
372  
373  	/** Mutex protecting against directory alias creation */
374  	struct mutex inst_mutex;
375  
376  	/** Refcount */
377  	atomic_t count;
378  
379  	/** The user id for this mount */
380  	kuid_t user_id;
381  
382  	/** The group id for this mount */
383  	kgid_t group_id;
384  
385  	/** The fuse mount flags for this mount */
386  	unsigned flags;
387  
388  	/** Maximum read size */
389  	unsigned max_read;
390  
391  	/** Maximum write size */
392  	unsigned max_write;
393  
394  	/** Readers of the connection are waiting on this */
395  	wait_queue_head_t waitq;
396  
397  	/** The list of pending requests */
398  	struct list_head pending;
399  
400  	/** The list of requests being processed */
401  	struct list_head processing;
402  
403  	/** The list of requests under I/O */
404  	struct list_head io;
405  
406  	/** The next unique kernel file handle */
407  	u64 khctr;
408  
409  	/** rbtree of fuse_files waiting for poll events indexed by ph */
410  	struct rb_root polled_files;
411  
412  	/** Maximum number of outstanding background requests */
413  	unsigned max_background;
414  
415  	/** Number of background requests at which congestion starts */
416  	unsigned congestion_threshold;
417  
418  	/** Number of requests currently in the background */
419  	unsigned num_background;
420  
421  	/** Number of background requests currently queued for userspace */
422  	unsigned active_background;
423  
424  	/** The list of background requests set aside for later queuing */
425  	struct list_head bg_queue;
426  
427  	/** Pending interrupts */
428  	struct list_head interrupts;
429  
430  	/** Queue of pending forgets */
431  	struct fuse_forget_link forget_list_head;
432  	struct fuse_forget_link *forget_list_tail;
433  
434  	/** Batching of FORGET requests (positive indicates FORGET batch) */
435  	int forget_batch;
436  
437  	/** Flag indicating that INIT reply has been received. Allocating
438  	 * any fuse request will be suspended until the flag is set */
439  	int initialized;
440  
441  	/** Flag indicating if connection is blocked.  This will be
442  	    the case before the INIT reply is received, and if there
443  	    are too many outstading backgrounds requests */
444  	int blocked;
445  
446  	/** waitq for blocked connection */
447  	wait_queue_head_t blocked_waitq;
448  
449  	/** waitq for reserved requests */
450  	wait_queue_head_t reserved_req_waitq;
451  
452  	/** The next unique request id */
453  	u64 reqctr;
454  
455  	/** Connection established, cleared on umount, connection
456  	    abort and device release */
457  	unsigned connected;
458  
459  	/** Connection failed (version mismatch).  Cannot race with
460  	    setting other bitfields since it is only set once in INIT
461  	    reply, before any other request, and never cleared */
462  	unsigned conn_error:1;
463  
464  	/** Connection successful.  Only set in INIT */
465  	unsigned conn_init:1;
466  
467  	/** Do readpages asynchronously?  Only set in INIT */
468  	unsigned async_read:1;
469  
470  	/** Do not send separate SETATTR request before open(O_TRUNC)  */
471  	unsigned atomic_o_trunc:1;
472  
473  	/** Filesystem supports NFS exporting.  Only set in INIT */
474  	unsigned export_support:1;
475  
476  	/** Set if bdi is valid */
477  	unsigned bdi_initialized:1;
478  
479  	/*
480  	 * The following bitfields are only for optimization purposes
481  	 * and hence races in setting them will not cause malfunction
482  	 */
483  
484  	/** Is fsync not implemented by fs? */
485  	unsigned no_fsync:1;
486  
487  	/** Is fsyncdir not implemented by fs? */
488  	unsigned no_fsyncdir:1;
489  
490  	/** Is flush not implemented by fs? */
491  	unsigned no_flush:1;
492  
493  	/** Is setxattr not implemented by fs? */
494  	unsigned no_setxattr:1;
495  
496  	/** Is getxattr not implemented by fs? */
497  	unsigned no_getxattr:1;
498  
499  	/** Is listxattr not implemented by fs? */
500  	unsigned no_listxattr:1;
501  
502  	/** Is removexattr not implemented by fs? */
503  	unsigned no_removexattr:1;
504  
505  	/** Are posix file locking primitives not implemented by fs? */
506  	unsigned no_lock:1;
507  
508  	/** Is access not implemented by fs? */
509  	unsigned no_access:1;
510  
511  	/** Is create not implemented by fs? */
512  	unsigned no_create:1;
513  
514  	/** Is interrupt not implemented by fs? */
515  	unsigned no_interrupt:1;
516  
517  	/** Is bmap not implemented by fs? */
518  	unsigned no_bmap:1;
519  
520  	/** Is poll not implemented by fs? */
521  	unsigned no_poll:1;
522  
523  	/** Do multi-page cached writes */
524  	unsigned big_writes:1;
525  
526  	/** Don't apply umask to creation modes */
527  	unsigned dont_mask:1;
528  
529  	/** Are BSD file locking primitives not implemented by fs? */
530  	unsigned no_flock:1;
531  
532  	/** Is fallocate not implemented by fs? */
533  	unsigned no_fallocate:1;
534  
535  	/** Use enhanced/automatic page cache invalidation. */
536  	unsigned auto_inval_data:1;
537  
538  	/** Does the filesystem support readdirplus? */
539  	unsigned do_readdirplus:1;
540  
541  	/** Does the filesystem want adaptive readdirplus? */
542  	unsigned readdirplus_auto:1;
543  
544  	/** Does the filesystem support asynchronous direct-IO submission? */
545  	unsigned async_dio:1;
546  
547  	/** The number of requests waiting for completion */
548  	atomic_t num_waiting;
549  
550  	/** Negotiated minor version */
551  	unsigned minor;
552  
553  	/** Backing dev info */
554  	struct backing_dev_info bdi;
555  
556  	/** Entry on the fuse_conn_list */
557  	struct list_head entry;
558  
559  	/** Device ID from super block */
560  	dev_t dev;
561  
562  	/** Dentries in the control filesystem */
563  	struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
564  
565  	/** number of dentries used in the above array */
566  	int ctl_ndents;
567  
568  	/** O_ASYNC requests */
569  	struct fasync_struct *fasync;
570  
571  	/** Key for lock owner ID scrambling */
572  	u32 scramble_key[4];
573  
574  	/** Reserved request for the DESTROY message */
575  	struct fuse_req *destroy_req;
576  
577  	/** Version counter for attribute changes */
578  	u64 attr_version;
579  
580  	/** Called on final put */
581  	void (*release)(struct fuse_conn *);
582  
583  	/** Super block for this connection. */
584  	struct super_block *sb;
585  
586  	/** Read/write semaphore to hold when accessing sb. */
587  	struct rw_semaphore killsb;
588  };
589  
590  static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
591  {
592  	return sb->s_fs_info;
593  }
594  
595  static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
596  {
597  	return get_fuse_conn_super(inode->i_sb);
598  }
599  
600  static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
601  {
602  	return container_of(inode, struct fuse_inode, inode);
603  }
604  
605  static inline u64 get_node_id(struct inode *inode)
606  {
607  	return get_fuse_inode(inode)->nodeid;
608  }
609  
610  /** Device operations */
611  extern const struct file_operations fuse_dev_operations;
612  
613  extern const struct dentry_operations fuse_dentry_operations;
614  
615  /**
616   * Inode to nodeid comparison.
617   */
618  int fuse_inode_eq(struct inode *inode, void *_nodeidp);
619  
620  /**
621   * Get a filled in inode
622   */
623  struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
624  			int generation, struct fuse_attr *attr,
625  			u64 attr_valid, u64 attr_version);
626  
627  int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
628  		     struct fuse_entry_out *outarg, struct inode **inode);
629  
630  /**
631   * Send FORGET command
632   */
633  void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
634  		       u64 nodeid, u64 nlookup);
635  
636  struct fuse_forget_link *fuse_alloc_forget(void);
637  
638  /* Used by READDIRPLUS */
639  void fuse_force_forget(struct file *file, u64 nodeid);
640  
641  /**
642   * Initialize READ or READDIR request
643   */
644  void fuse_read_fill(struct fuse_req *req, struct file *file,
645  		    loff_t pos, size_t count, int opcode);
646  
647  /**
648   * Send OPEN or OPENDIR request
649   */
650  int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
651  
652  struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
653  struct fuse_file *fuse_file_get(struct fuse_file *ff);
654  void fuse_file_free(struct fuse_file *ff);
655  void fuse_finish_open(struct inode *inode, struct file *file);
656  
657  void fuse_sync_release(struct fuse_file *ff, int flags);
658  
659  /**
660   * Send RELEASE or RELEASEDIR request
661   */
662  void fuse_release_common(struct file *file, int opcode);
663  
664  /**
665   * Send FSYNC or FSYNCDIR request
666   */
667  int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
668  		      int datasync, int isdir);
669  
670  /**
671   * Notify poll wakeup
672   */
673  int fuse_notify_poll_wakeup(struct fuse_conn *fc,
674  			    struct fuse_notify_poll_wakeup_out *outarg);
675  
676  /**
677   * Initialize file operations on a regular file
678   */
679  void fuse_init_file_inode(struct inode *inode);
680  
681  /**
682   * Initialize inode operations on regular files and special files
683   */
684  void fuse_init_common(struct inode *inode);
685  
686  /**
687   * Initialize inode and file operations on a directory
688   */
689  void fuse_init_dir(struct inode *inode);
690  
691  /**
692   * Initialize inode operations on a symlink
693   */
694  void fuse_init_symlink(struct inode *inode);
695  
696  /**
697   * Change attributes of an inode
698   */
699  void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
700  			    u64 attr_valid, u64 attr_version);
701  
702  void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
703  				   u64 attr_valid);
704  
705  /**
706   * Initialize the client device
707   */
708  int fuse_dev_init(void);
709  
710  /**
711   * Cleanup the client device
712   */
713  void fuse_dev_cleanup(void);
714  
715  int fuse_ctl_init(void);
716  void fuse_ctl_cleanup(void);
717  
718  /**
719   * Allocate a request
720   */
721  struct fuse_req *fuse_request_alloc(unsigned npages);
722  
723  struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
724  
725  /**
726   * Free a request
727   */
728  void fuse_request_free(struct fuse_req *req);
729  
730  /**
731   * Get a request, may fail with -ENOMEM,
732   * caller should specify # elements in req->pages[] explicitly
733   */
734  struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
735  struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
736  					     unsigned npages);
737  
738  /*
739   * Increment reference count on request
740   */
741  void __fuse_get_request(struct fuse_req *req);
742  
743  /**
744   * Get a request, may fail with -ENOMEM,
745   * useful for callers who doesn't use req->pages[]
746   */
747  static inline struct fuse_req *fuse_get_req_nopages(struct fuse_conn *fc)
748  {
749  	return fuse_get_req(fc, 0);
750  }
751  
752  /**
753   * Gets a requests for a file operation, always succeeds
754   */
755  struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
756  					     struct file *file);
757  
758  /**
759   * Decrement reference count of a request.  If count goes to zero free
760   * the request.
761   */
762  void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
763  
764  /**
765   * Send a request (synchronous)
766   */
767  void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
768  
769  /**
770   * Send a request in the background
771   */
772  void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
773  
774  void fuse_request_send_background_locked(struct fuse_conn *fc,
775  					 struct fuse_req *req);
776  
777  /* Abort all requests */
778  void fuse_abort_conn(struct fuse_conn *fc);
779  
780  /**
781   * Invalidate inode attributes
782   */
783  void fuse_invalidate_attr(struct inode *inode);
784  
785  void fuse_invalidate_entry_cache(struct dentry *entry);
786  
787  /**
788   * Acquire reference to fuse_conn
789   */
790  struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
791  
792  void fuse_conn_kill(struct fuse_conn *fc);
793  
794  /**
795   * Initialize fuse_conn
796   */
797  void fuse_conn_init(struct fuse_conn *fc);
798  
799  /**
800   * Release reference to fuse_conn
801   */
802  void fuse_conn_put(struct fuse_conn *fc);
803  
804  /**
805   * Add connection to control filesystem
806   */
807  int fuse_ctl_add_conn(struct fuse_conn *fc);
808  
809  /**
810   * Remove connection from control filesystem
811   */
812  void fuse_ctl_remove_conn(struct fuse_conn *fc);
813  
814  /**
815   * Is file type valid?
816   */
817  int fuse_valid_type(int m);
818  
819  /**
820   * Is current process allowed to perform filesystem operation?
821   */
822  int fuse_allow_current_process(struct fuse_conn *fc);
823  
824  u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
825  
826  int fuse_update_attributes(struct inode *inode, struct kstat *stat,
827  			   struct file *file, bool *refreshed);
828  
829  void fuse_flush_writepages(struct inode *inode);
830  
831  void fuse_set_nowrite(struct inode *inode);
832  void fuse_release_nowrite(struct inode *inode);
833  
834  u64 fuse_get_attr_version(struct fuse_conn *fc);
835  
836  /**
837   * File-system tells the kernel to invalidate cache for the given node id.
838   */
839  int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
840  			     loff_t offset, loff_t len);
841  
842  /**
843   * File-system tells the kernel to invalidate parent attributes and
844   * the dentry matching parent/name.
845   *
846   * If the child_nodeid is non-zero and:
847   *    - matches the inode number for the dentry matching parent/name,
848   *    - is not a mount point
849   *    - is a file or oan empty directory
850   * then the dentry is unhashed (d_delete()).
851   */
852  int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
853  			     u64 child_nodeid, struct qstr *name);
854  
855  int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
856  		 bool isdir);
857  ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
858  		       unsigned long nr_segs, size_t count, loff_t *ppos,
859  		       int write);
860  long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
861  		   unsigned int flags);
862  long fuse_ioctl_common(struct file *file, unsigned int cmd,
863  		       unsigned long arg, unsigned int flags);
864  unsigned fuse_file_poll(struct file *file, poll_table *wait);
865  int fuse_dev_release(struct inode *inode, struct file *file);
866  
867  void fuse_write_update_size(struct inode *inode, loff_t pos);
868  
869  int fuse_do_setattr(struct inode *inode, struct iattr *attr,
870  		    struct file *file);
871  
872  #endif /* _FS_FUSE_I_H */
873