2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
5 This program can be distributed under the terms of the GNU GPL.
13 # define pr_fmt(fmt) "fuse: " fmt
16 #include <linux/fuse.h>
18 #include <linux/mount.h>
19 #include <linux/wait.h>
20 #include <linux/list.h>
21 #include <linux/spinlock.h>
23 #include <linux/backing-dev.h>
24 #include <linux/mutex.h>
25 #include <linux/rwsem.h>
26 #include <linux/rbtree.h>
27 #include <linux/poll.h>
28 #include <linux/workqueue.h>
29 #include <linux/kref.h>
30 #include <linux/xattr.h>
31 #include <linux/pid_namespace.h>
32 #include <linux/refcount.h>
33 #include <linux/user_namespace.h>
35 /** Default max number of pages that can be used in a single read request */
36 #define FUSE_DEFAULT_MAX_PAGES_PER_REQ 32
38 /** Maximum of max_pages received in init_out */
39 #define FUSE_MAX_MAX_PAGES 256
41 /** Bias for fi->writectr, meaning new writepages must not be sent */
42 #define FUSE_NOWRITE INT_MIN
44 /** It could be as large as PATH_MAX, but would that have any uses? */
45 #define FUSE_NAME_MAX 1024
47 /** Number of dentries for each connection in the control filesystem */
48 #define FUSE_CTL_NUM_DENTRIES 5
50 /** List of active connections */
51 extern struct list_head fuse_conn_list;
53 /** Global mutex protecting fuse_conn_list and the control filesystem */
54 extern struct mutex fuse_mutex;
56 /** Module parameters */
57 extern unsigned max_user_bgreq;
58 extern unsigned max_user_congthresh;
60 /* One forget request */
61 struct fuse_forget_link {
62 struct fuse_forget_one forget_one;
63 struct fuse_forget_link *next;
71 /** Unique ID, which identifies the inode between userspace
75 /** Number of lookups on this inode */
78 /** The request used for sending the FORGET message */
79 struct fuse_forget_link *forget;
81 /** Time in jiffies until the file attributes are valid */
84 /* Which attributes are invalid */
87 /** The sticky bit in inode->i_mode may have been removed, so
88 preserve the original mode */
91 /** 64 bit inode number */
94 /** Version of last attribute change */
98 /* Write related fields (regular file only) */
100 /* Files usable in writepage. Protected by fi->lock */
101 struct list_head write_files;
103 /* Writepages pending on truncate or fsync */
104 struct list_head queued_writes;
106 /* Number of sent writes, a negative bias
107 * (FUSE_NOWRITE) means more writes are blocked */
110 /* Waitq for writepage completion */
111 wait_queue_head_t page_waitq;
113 /* List of writepage requestst (pending or sent) */
114 struct list_head writepages;
117 /* readdir cache (directory only) */
119 /* true if fully cached */
125 /* position at end of cache (position of next entry) */
128 /* version of the cache */
131 /* modification time of directory when cache was
133 struct timespec64 mtime;
135 /* iversion of directory when cache was started */
138 /* protects above fields */
143 /** Miscellaneous bits describing inode state */
146 /** Lock for serializing lookup and readdir for back compatibility*/
149 /** Lock to protect write related fields */
153 /** FUSE inode state bits */
155 /** Advise readdirplus */
156 FUSE_I_ADVISE_RDPLUS,
157 /** Initialized with readdirplus */
159 /** An operation changing file size is in progress */
160 FUSE_I_SIZE_UNSTABLE,
166 struct fuse_release_args;
168 /** FUSE specific file data */
170 /** Fuse connection for this file */
171 struct fuse_conn *fc;
173 /* Argument space reserved for release */
174 struct fuse_release_args *release_args;
176 /** Kernel file handle guaranteed to be unique */
179 /** File handle used by userspace */
182 /** Node id of this file */
188 /** FOPEN_* flags returned by open */
191 /** Entry on inode's write_files list */
192 struct list_head write_entry;
194 /* Readdir related */
197 * Protects below fields against (crazy) parallel readdir on
198 * same open file. Uncontended in the normal case.
202 /* Dir stream position */
205 /* Offset in cache */
208 /* Version of cache we are reading */
213 /** RB node to be linked on fuse_conn->polled_files */
214 struct rb_node polled_node;
216 /** Wait queue head for poll */
217 wait_queue_head_t poll_wait;
219 /** Has flock been performed on this file? */
223 /** One input argument of a request */
229 /** One output argument of a request */
235 /** FUSE page descriptor */
236 struct fuse_page_desc {
244 unsigned short in_numargs;
245 unsigned short out_numargs;
256 struct fuse_in_arg in_args[3];
257 struct fuse_arg out_args[2];
258 void (*end)(struct fuse_conn *fc, struct fuse_args *args, int error);
261 struct fuse_args_pages {
262 struct fuse_args args;
264 struct fuse_page_desc *descs;
265 unsigned int num_pages;
268 #define FUSE_ARGS(args) struct fuse_args args = {}
270 /** The request IO state (for asynchronous processing) */
271 struct fuse_io_priv {
283 struct completion *done;
287 #define FUSE_IO_PRIV_SYNC(i) \
289 .refcnt = KREF_INIT(1), \
297 * FR_ISREPLY: set if the request has reply
298 * FR_FORCE: force sending of the request even if interrupted
299 * FR_BACKGROUND: request is sent in the background
300 * FR_WAITING: request is counted as "waiting"
301 * FR_ABORTED: the request was aborted
302 * FR_INTERRUPTED: the request has been interrupted
303 * FR_LOCKED: data is being copied to/from the request
304 * FR_PENDING: request is not yet in userspace
305 * FR_SENT: request is in userspace, waiting for an answer
306 * FR_FINISHED: request is finished
307 * FR_PRIVATE: request is on private list
308 * FR_ASYNC: request is asynchronous
326 * A request to the client
328 * .waitq.lock protects the following fields:
330 * - FR_LOCKED (may also be modified under fc->lock, tested under both)
333 /** This can be on either pending processing or io lists in
335 struct list_head list;
337 /** Entry on the interrupts list */
338 struct list_head intr_entry;
340 /* Input/output arguments */
341 struct fuse_args *args;
346 /* Request flags, updated with test/set/clear_bit() */
349 /* The request input header */
351 struct fuse_in_header h;
354 /* The request output header */
356 struct fuse_out_header h;
359 /** Used to wake up the task waiting for completion of request*/
360 wait_queue_head_t waitq;
362 #if IS_ENABLED(CONFIG_VIRTIO_FS)
363 /** virtio-fs's physically contiguous buffer for in and out args */
371 * Input queue callbacks
373 * Input queue signalling is device-specific. For example, the /dev/fuse file
374 * uses fiq->waitq and fasync to wake processes that are waiting on queue
375 * readiness. These callbacks allow other device types to respond to input
378 struct fuse_iqueue_ops {
380 * Signal that a forget has been queued
382 void (*wake_forget_and_unlock)(struct fuse_iqueue *fiq)
383 __releases(fiq->lock);
386 * Signal that an INTERRUPT request has been queued
388 void (*wake_interrupt_and_unlock)(struct fuse_iqueue *fiq)
389 __releases(fiq->lock);
392 * Signal that a request has been queued
394 void (*wake_pending_and_unlock)(struct fuse_iqueue *fiq)
395 __releases(fiq->lock);
398 * Clean up when fuse_iqueue is destroyed
400 void (*release)(struct fuse_iqueue *fiq);
403 /** /dev/fuse input queue operations */
404 extern const struct fuse_iqueue_ops fuse_dev_fiq_ops;
407 /** Connection established */
410 /** Lock protecting accesses to members of this structure */
413 /** Readers of the connection are waiting on this */
414 wait_queue_head_t waitq;
416 /** The next unique request id */
419 /** The list of pending requests */
420 struct list_head pending;
422 /** Pending interrupts */
423 struct list_head interrupts;
425 /** Queue of pending forgets */
426 struct fuse_forget_link forget_list_head;
427 struct fuse_forget_link *forget_list_tail;
429 /** Batching of FORGET requests (positive indicates FORGET batch) */
432 /** O_ASYNC requests */
433 struct fasync_struct *fasync;
435 /** Device-specific callbacks */
436 const struct fuse_iqueue_ops *ops;
438 /** Device-specific state */
442 #define FUSE_PQ_HASH_BITS 8
443 #define FUSE_PQ_HASH_SIZE (1 << FUSE_PQ_HASH_BITS)
446 /** Connection established */
449 /** Lock protecting accessess to members of this structure */
452 /** Hash table of requests being processed */
453 struct list_head *processing;
455 /** The list of requests under I/O */
460 * Fuse device instance
463 /** Fuse connection for this device */
464 struct fuse_conn *fc;
466 /** Processing queue */
467 struct fuse_pqueue pq;
469 /** list entry on fc->devices */
470 struct list_head entry;
473 struct fuse_fs_context {
475 unsigned int rootmode;
480 bool rootmode_present:1;
481 bool user_id_present:1;
482 bool group_id_present:1;
483 bool default_permissions:1;
487 bool no_force_umount:1;
488 bool no_mount_options:1;
489 unsigned int max_read;
490 unsigned int blksize;
493 /* fuse_dev pointer to fill in, should contain NULL on entry */
500 * This structure is created, when the filesystem is mounted, and is
501 * destroyed, when the client device is closed and the filesystem is
505 /** Lock protecting accessess to members of this structure */
511 /** Number of fuse_dev's */
516 /** The user id for this mount */
519 /** The group id for this mount */
522 /** The pid namespace for this mount */
523 struct pid_namespace *pid_ns;
525 /** The user namespace for this mount */
526 struct user_namespace *user_ns;
528 /** Maximum read size */
531 /** Maximum write size */
534 /** Maxmum number of pages that can be used in a single request */
535 unsigned int max_pages;
538 struct fuse_iqueue iq;
540 /** The next unique kernel file handle */
543 /** rbtree of fuse_files waiting for poll events indexed by ph */
544 struct rb_root polled_files;
546 /** Maximum number of outstanding background requests */
547 unsigned max_background;
549 /** Number of background requests at which congestion starts */
550 unsigned congestion_threshold;
552 /** Number of requests currently in the background */
553 unsigned num_background;
555 /** Number of background requests currently queued for userspace */
556 unsigned active_background;
558 /** The list of background requests set aside for later queuing */
559 struct list_head bg_queue;
561 /** Protects: max_background, congestion_threshold, num_background,
562 * active_background, bg_queue, blocked */
565 /** Flag indicating that INIT reply has been received. Allocating
566 * any fuse request will be suspended until the flag is set */
569 /** Flag indicating if connection is blocked. This will be
570 the case before the INIT reply is received, and if there
571 are too many outstading backgrounds requests */
574 /** waitq for blocked connection */
575 wait_queue_head_t blocked_waitq;
577 /** Connection established, cleared on umount, connection
578 abort and device release */
581 /** Connection aborted via sysfs */
584 /** Connection failed (version mismatch). Cannot race with
585 setting other bitfields since it is only set once in INIT
586 reply, before any other request, and never cleared */
587 unsigned conn_error:1;
589 /** Connection successful. Only set in INIT */
590 unsigned conn_init:1;
592 /** Do readpages asynchronously? Only set in INIT */
593 unsigned async_read:1;
595 /** Return an unique read error after abort. Only set in INIT */
596 unsigned abort_err:1;
598 /** Do not send separate SETATTR request before open(O_TRUNC) */
599 unsigned atomic_o_trunc:1;
601 /** Filesystem supports NFS exporting. Only set in INIT */
602 unsigned export_support:1;
604 /** write-back cache policy (default is write-through) */
605 unsigned writeback_cache:1;
607 /** allow parallel lookups and readdir (default is serialized) */
608 unsigned parallel_dirops:1;
610 /** handle fs handles killing suid/sgid/cap on write/chown/trunc */
611 unsigned handle_killpriv:1;
613 /** cache READLINK responses in page cache */
614 unsigned cache_symlinks:1;
617 * The following bitfields are only for optimization purposes
618 * and hence races in setting them will not cause malfunction
621 /** Is open/release not implemented by fs? */
624 /** Is opendir/releasedir not implemented by fs? */
625 unsigned no_opendir:1;
627 /** Is fsync not implemented by fs? */
630 /** Is fsyncdir not implemented by fs? */
631 unsigned no_fsyncdir:1;
633 /** Is flush not implemented by fs? */
636 /** Is setxattr not implemented by fs? */
637 unsigned no_setxattr:1;
639 /** Is getxattr not implemented by fs? */
640 unsigned no_getxattr:1;
642 /** Is listxattr not implemented by fs? */
643 unsigned no_listxattr:1;
645 /** Is removexattr not implemented by fs? */
646 unsigned no_removexattr:1;
648 /** Are posix file locking primitives not implemented by fs? */
651 /** Is access not implemented by fs? */
652 unsigned no_access:1;
654 /** Is create not implemented by fs? */
655 unsigned no_create:1;
657 /** Is interrupt not implemented by fs? */
658 unsigned no_interrupt:1;
660 /** Is bmap not implemented by fs? */
663 /** Is poll not implemented by fs? */
666 /** Do multi-page cached writes */
667 unsigned big_writes:1;
669 /** Don't apply umask to creation modes */
670 unsigned dont_mask:1;
672 /** Are BSD file locking primitives not implemented by fs? */
675 /** Is fallocate not implemented by fs? */
676 unsigned no_fallocate:1;
678 /** Is rename with flags implemented by fs? */
679 unsigned no_rename2:1;
681 /** Use enhanced/automatic page cache invalidation. */
682 unsigned auto_inval_data:1;
684 /** Filesystem is fully reponsible for page cache invalidation. */
685 unsigned explicit_inval_data:1;
687 /** Does the filesystem support readdirplus? */
688 unsigned do_readdirplus:1;
690 /** Does the filesystem want adaptive readdirplus? */
691 unsigned readdirplus_auto:1;
693 /** Does the filesystem support asynchronous direct-IO submission? */
694 unsigned async_dio:1;
696 /** Is lseek not implemented by fs? */
699 /** Does the filesystem support posix acls? */
700 unsigned posix_acl:1;
702 /** Check permissions based on the file mode or not? */
703 unsigned default_permissions:1;
705 /** Allow other than the mounter user to access the filesystem ? */
706 unsigned allow_other:1;
708 /** Does the filesystem support copy_file_range? */
709 unsigned no_copy_file_range:1;
711 /* Send DESTROY request */
712 unsigned int destroy:1;
714 /* Delete dentries that have gone stale */
715 unsigned int delete_stale:1;
717 /** Do not create entry in fusectl fs */
718 unsigned int no_control:1;
720 /** Do not allow MNT_FORCE umount */
721 unsigned int no_force_umount:1;
723 /* Do not show mount options */
724 unsigned int no_mount_options:1;
726 /** The number of requests waiting for completion */
727 atomic_t num_waiting;
729 /** Negotiated minor version */
732 /** Entry on the fuse_conn_list */
733 struct list_head entry;
735 /** Device ID from super block */
738 /** Dentries in the control filesystem */
739 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
741 /** number of dentries used in the above array */
744 /** Key for lock owner ID scrambling */
747 /** Version counter for attribute changes */
748 atomic64_t attr_version;
750 /** Called on final put */
751 void (*release)(struct fuse_conn *);
753 /** Super block for this connection. */
754 struct super_block *sb;
756 /** Read/write semaphore to hold when accessing sb. */
757 struct rw_semaphore killsb;
759 /** List of device instances belonging to this connection */
760 struct list_head devices;
763 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
765 return sb->s_fs_info;
768 static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
770 return get_fuse_conn_super(inode->i_sb);
773 static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
775 return container_of(inode, struct fuse_inode, inode);
778 static inline u64 get_node_id(struct inode *inode)
780 return get_fuse_inode(inode)->nodeid;
783 static inline int invalid_nodeid(u64 nodeid)
785 return !nodeid || nodeid == FUSE_ROOT_ID;
788 static inline u64 fuse_get_attr_version(struct fuse_conn *fc)
790 return atomic64_read(&fc->attr_version);
793 static inline void fuse_make_bad(struct inode *inode)
795 remove_inode_hash(inode);
796 set_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state);
799 static inline bool fuse_is_bad(struct inode *inode)
801 return unlikely(test_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state));
804 /** Device operations */
805 extern const struct file_operations fuse_dev_operations;
807 extern const struct dentry_operations fuse_dentry_operations;
808 extern const struct dentry_operations fuse_root_dentry_operations;
811 * Inode to nodeid comparison.
813 int fuse_inode_eq(struct inode *inode, void *_nodeidp);
816 * Get a filled in inode
818 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
819 int generation, struct fuse_attr *attr,
820 u64 attr_valid, u64 attr_version);
822 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
823 struct fuse_entry_out *outarg, struct inode **inode);
826 * Send FORGET command
828 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
829 u64 nodeid, u64 nlookup);
831 struct fuse_forget_link *fuse_alloc_forget(void);
833 struct fuse_forget_link *fuse_dequeue_forget(struct fuse_iqueue *fiq,
835 unsigned int *countp);
838 * Initialize READ or READDIR request
840 struct fuse_io_args {
843 struct fuse_read_in in;
847 struct fuse_write_in in;
848 struct fuse_write_out out;
852 struct fuse_args_pages ap;
853 struct fuse_io_priv *io;
854 struct fuse_file *ff;
857 void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
858 size_t count, int opcode);
862 * Send OPEN or OPENDIR request
864 int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
866 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
867 void fuse_file_free(struct fuse_file *ff);
868 void fuse_finish_open(struct inode *inode, struct file *file);
870 void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, int flags);
873 * Send RELEASE or RELEASEDIR request
875 void fuse_release_common(struct file *file, bool isdir);
878 * Send FSYNC or FSYNCDIR request
880 int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
881 int datasync, int opcode);
886 int fuse_notify_poll_wakeup(struct fuse_conn *fc,
887 struct fuse_notify_poll_wakeup_out *outarg);
890 * Initialize file operations on a regular file
892 void fuse_init_file_inode(struct inode *inode);
895 * Initialize inode operations on regular files and special files
897 void fuse_init_common(struct inode *inode);
900 * Initialize inode and file operations on a directory
902 void fuse_init_dir(struct inode *inode);
905 * Initialize inode operations on a symlink
907 void fuse_init_symlink(struct inode *inode);
910 * Change attributes of an inode
912 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
913 u64 attr_valid, u64 attr_version);
915 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
919 * Initialize the client device
921 int fuse_dev_init(void);
924 * Cleanup the client device
926 void fuse_dev_cleanup(void);
928 int fuse_ctl_init(void);
929 void __exit fuse_ctl_cleanup(void);
932 * Simple request sending that does request allocation and freeing
934 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
935 int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
939 * End a finished request
941 void fuse_request_end(struct fuse_conn *fc, struct fuse_req *req);
943 /* Abort all requests */
944 void fuse_abort_conn(struct fuse_conn *fc);
945 void fuse_wait_aborted(struct fuse_conn *fc);
948 * Invalidate inode attributes
950 void fuse_invalidate_attr(struct inode *inode);
952 void fuse_invalidate_entry_cache(struct dentry *entry);
954 void fuse_invalidate_atime(struct inode *inode);
956 u64 entry_attr_timeout(struct fuse_entry_out *o);
957 void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o);
960 * Acquire reference to fuse_conn
962 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
965 * Initialize fuse_conn
967 void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,
968 const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv);
971 * Release reference to fuse_conn
973 void fuse_conn_put(struct fuse_conn *fc);
975 struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc);
976 struct fuse_dev *fuse_dev_alloc(void);
977 void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc);
978 void fuse_dev_free(struct fuse_dev *fud);
979 void fuse_send_init(struct fuse_conn *fc);
982 * Fill in superblock and initialize fuse connection
983 * @sb: partially-initialized superblock to fill in
984 * @ctx: mount context
986 int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx);
989 * Disassociate fuse connection from superblock and kill the superblock
991 * Calls kill_anon_super(), do not use with bdev mounts.
993 void fuse_kill_sb_anon(struct super_block *sb);
996 * Add connection to control filesystem
998 int fuse_ctl_add_conn(struct fuse_conn *fc);
1001 * Remove connection from control filesystem
1003 void fuse_ctl_remove_conn(struct fuse_conn *fc);
1006 * Is file type valid?
1008 int fuse_valid_type(int m);
1010 bool fuse_invalid_attr(struct fuse_attr *attr);
1013 * Is current process allowed to perform filesystem operation?
1015 int fuse_allow_current_process(struct fuse_conn *fc);
1017 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
1019 void fuse_update_ctime(struct inode *inode);
1021 int fuse_update_attributes(struct inode *inode, struct file *file);
1023 void fuse_flush_writepages(struct inode *inode);
1025 void fuse_set_nowrite(struct inode *inode);
1026 void fuse_release_nowrite(struct inode *inode);
1029 * File-system tells the kernel to invalidate cache for the given node id.
1031 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
1032 loff_t offset, loff_t len);
1035 * File-system tells the kernel to invalidate parent attributes and
1036 * the dentry matching parent/name.
1038 * If the child_nodeid is non-zero and:
1039 * - matches the inode number for the dentry matching parent/name,
1040 * - is not a mount point
1041 * - is a file or oan empty directory
1042 * then the dentry is unhashed (d_delete()).
1044 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
1045 u64 child_nodeid, struct qstr *name);
1047 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
1051 * fuse_direct_io() flags
1054 /** If set, it is WRITE; otherwise - READ */
1055 #define FUSE_DIO_WRITE (1 << 0)
1057 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
1058 #define FUSE_DIO_CUSE (1 << 1)
1060 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
1061 loff_t *ppos, int flags);
1062 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1063 unsigned int flags);
1064 long fuse_ioctl_common(struct file *file, unsigned int cmd,
1065 unsigned long arg, unsigned int flags);
1066 __poll_t fuse_file_poll(struct file *file, poll_table *wait);
1067 int fuse_dev_release(struct inode *inode, struct file *file);
1069 bool fuse_write_update_size(struct inode *inode, loff_t pos);
1071 int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
1072 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
1074 int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
1077 void fuse_set_initialized(struct fuse_conn *fc);
1079 void fuse_unlock_inode(struct inode *inode, bool locked);
1080 bool fuse_lock_inode(struct inode *inode);
1082 int fuse_setxattr(struct inode *inode, const char *name, const void *value,
1083 size_t size, int flags);
1084 ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
1086 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
1087 int fuse_removexattr(struct inode *inode, const char *name);
1088 extern const struct xattr_handler *fuse_xattr_handlers[];
1089 extern const struct xattr_handler *fuse_acl_xattr_handlers[];
1090 extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
1093 struct posix_acl *fuse_get_acl(struct inode *inode, int type);
1094 int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
1098 int fuse_readdir(struct file *file, struct dir_context *ctx);
1101 * Return the number of bytes in an arguments list
1103 unsigned int fuse_len_args(unsigned int numargs, struct fuse_arg *args);
1106 * Get the next unique ID for a request
1108 u64 fuse_get_unique(struct fuse_iqueue *fiq);
1109 void fuse_free_conn(struct fuse_conn *fc);
1111 #endif /* _FS_FUSE_I_H */