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 rb_root 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 * Can't take inode lock in fault path (leads to circular dependency).
154 * Introduce another semaphore which can be taken in fault path and
155 * then other filesystem paths can take this to block faults.
157 struct rw_semaphore i_mmap_sem;
159 #ifdef CONFIG_FUSE_DAX
161 * Dax specific inode data
163 struct fuse_inode_dax *dax;
167 /** FUSE inode state bits */
169 /** Advise readdirplus */
170 FUSE_I_ADVISE_RDPLUS,
171 /** Initialized with readdirplus */
173 /** An operation changing file size is in progress */
174 FUSE_I_SIZE_UNSTABLE,
181 struct fuse_release_args;
183 /** FUSE specific file data */
185 /** Fuse connection for this file */
186 struct fuse_mount *fm;
188 /* Argument space reserved for release */
189 struct fuse_release_args *release_args;
191 /** Kernel file handle guaranteed to be unique */
194 /** File handle used by userspace */
197 /** Node id of this file */
203 /** FOPEN_* flags returned by open */
206 /** Entry on inode's write_files list */
207 struct list_head write_entry;
209 /* Readdir related */
212 * Protects below fields against (crazy) parallel readdir on
213 * same open file. Uncontended in the normal case.
217 /* Dir stream position */
220 /* Offset in cache */
223 /* Version of cache we are reading */
228 /** RB node to be linked on fuse_conn->polled_files */
229 struct rb_node polled_node;
231 /** Wait queue head for poll */
232 wait_queue_head_t poll_wait;
234 /** Has flock been performed on this file? */
238 /** One input argument of a request */
244 /** One output argument of a request */
250 /** FUSE page descriptor */
251 struct fuse_page_desc {
259 unsigned short in_numargs;
260 unsigned short out_numargs;
271 struct fuse_in_arg in_args[3];
272 struct fuse_arg out_args[2];
273 void (*end)(struct fuse_mount *fm, struct fuse_args *args, int error);
276 struct fuse_args_pages {
277 struct fuse_args args;
279 struct fuse_page_desc *descs;
280 unsigned int num_pages;
283 #define FUSE_ARGS(args) struct fuse_args args = {}
285 /** The request IO state (for asynchronous processing) */
286 struct fuse_io_priv {
298 struct completion *done;
302 #define FUSE_IO_PRIV_SYNC(i) \
304 .refcnt = KREF_INIT(1), \
312 * FR_ISREPLY: set if the request has reply
313 * FR_FORCE: force sending of the request even if interrupted
314 * FR_BACKGROUND: request is sent in the background
315 * FR_WAITING: request is counted as "waiting"
316 * FR_ABORTED: the request was aborted
317 * FR_INTERRUPTED: the request has been interrupted
318 * FR_LOCKED: data is being copied to/from the request
319 * FR_PENDING: request is not yet in userspace
320 * FR_SENT: request is in userspace, waiting for an answer
321 * FR_FINISHED: request is finished
322 * FR_PRIVATE: request is on private list
323 * FR_ASYNC: request is asynchronous
341 * A request to the client
343 * .waitq.lock protects the following fields:
345 * - FR_LOCKED (may also be modified under fc->lock, tested under both)
348 /** This can be on either pending processing or io lists in
350 struct list_head list;
352 /** Entry on the interrupts list */
353 struct list_head intr_entry;
355 /* Input/output arguments */
356 struct fuse_args *args;
361 /* Request flags, updated with test/set/clear_bit() */
364 /* The request input header */
366 struct fuse_in_header h;
369 /* The request output header */
371 struct fuse_out_header h;
374 /** Used to wake up the task waiting for completion of request*/
375 wait_queue_head_t waitq;
377 #if IS_ENABLED(CONFIG_VIRTIO_FS)
378 /** virtio-fs's physically contiguous buffer for in and out args */
382 /** fuse_mount this request belongs to */
383 struct fuse_mount *fm;
389 * Input queue callbacks
391 * Input queue signalling is device-specific. For example, the /dev/fuse file
392 * uses fiq->waitq and fasync to wake processes that are waiting on queue
393 * readiness. These callbacks allow other device types to respond to input
396 struct fuse_iqueue_ops {
398 * Signal that a forget has been queued
400 void (*wake_forget_and_unlock)(struct fuse_iqueue *fiq)
401 __releases(fiq->lock);
404 * Signal that an INTERRUPT request has been queued
406 void (*wake_interrupt_and_unlock)(struct fuse_iqueue *fiq)
407 __releases(fiq->lock);
410 * Signal that a request has been queued
412 void (*wake_pending_and_unlock)(struct fuse_iqueue *fiq)
413 __releases(fiq->lock);
416 * Clean up when fuse_iqueue is destroyed
418 void (*release)(struct fuse_iqueue *fiq);
421 /** /dev/fuse input queue operations */
422 extern const struct fuse_iqueue_ops fuse_dev_fiq_ops;
425 /** Connection established */
428 /** Lock protecting accesses to members of this structure */
431 /** Readers of the connection are waiting on this */
432 wait_queue_head_t waitq;
434 /** The next unique request id */
437 /** The list of pending requests */
438 struct list_head pending;
440 /** Pending interrupts */
441 struct list_head interrupts;
443 /** Queue of pending forgets */
444 struct fuse_forget_link forget_list_head;
445 struct fuse_forget_link *forget_list_tail;
447 /** Batching of FORGET requests (positive indicates FORGET batch) */
450 /** O_ASYNC requests */
451 struct fasync_struct *fasync;
453 /** Device-specific callbacks */
454 const struct fuse_iqueue_ops *ops;
456 /** Device-specific state */
460 #define FUSE_PQ_HASH_BITS 8
461 #define FUSE_PQ_HASH_SIZE (1 << FUSE_PQ_HASH_BITS)
464 /** Connection established */
467 /** Lock protecting accessess to members of this structure */
470 /** Hash table of requests being processed */
471 struct list_head *processing;
473 /** The list of requests under I/O */
478 * Fuse device instance
481 /** Fuse connection for this device */
482 struct fuse_conn *fc;
484 /** Processing queue */
485 struct fuse_pqueue pq;
487 /** list entry on fc->devices */
488 struct list_head entry;
491 struct fuse_fs_context {
493 unsigned int rootmode;
498 bool rootmode_present:1;
499 bool user_id_present:1;
500 bool group_id_present:1;
501 bool default_permissions:1;
505 bool no_force_umount:1;
506 bool legacy_opts_show:1;
508 unsigned int max_read;
509 unsigned int blksize;
512 /* DAX device, may be NULL */
513 struct dax_device *dax_dev;
515 /* fuse_dev pointer to fill in, should contain NULL on entry */
522 * This structure is created, when the root filesystem is mounted, and
523 * is destroyed, when the client device is closed and the last
524 * fuse_mount is destroyed.
527 /** Lock protecting accessess to members of this structure */
533 /** Number of fuse_dev's */
538 /** The user id for this mount */
541 /** The group id for this mount */
544 /** The pid namespace for this mount */
545 struct pid_namespace *pid_ns;
547 /** The user namespace for this mount */
548 struct user_namespace *user_ns;
550 /** Maximum read size */
553 /** Maximum write size */
556 /** Maxmum number of pages that can be used in a single request */
557 unsigned int max_pages;
559 /** Constrain ->max_pages to this value during feature negotiation */
560 unsigned int max_pages_limit;
563 struct fuse_iqueue iq;
565 /** The next unique kernel file handle */
568 /** rbtree of fuse_files waiting for poll events indexed by ph */
569 struct rb_root polled_files;
571 /** Maximum number of outstanding background requests */
572 unsigned max_background;
574 /** Number of background requests at which congestion starts */
575 unsigned congestion_threshold;
577 /** Number of requests currently in the background */
578 unsigned num_background;
580 /** Number of background requests currently queued for userspace */
581 unsigned active_background;
583 /** The list of background requests set aside for later queuing */
584 struct list_head bg_queue;
586 /** Protects: max_background, congestion_threshold, num_background,
587 * active_background, bg_queue, blocked */
590 /** Flag indicating that INIT reply has been received. Allocating
591 * any fuse request will be suspended until the flag is set */
594 /** Flag indicating if connection is blocked. This will be
595 the case before the INIT reply is received, and if there
596 are too many outstading backgrounds requests */
599 /** waitq for blocked connection */
600 wait_queue_head_t blocked_waitq;
602 /** Connection established, cleared on umount, connection
603 abort and device release */
606 /** Connection aborted via sysfs */
609 /** Connection failed (version mismatch). Cannot race with
610 setting other bitfields since it is only set once in INIT
611 reply, before any other request, and never cleared */
612 unsigned conn_error:1;
614 /** Connection successful. Only set in INIT */
615 unsigned conn_init:1;
617 /** Do readpages asynchronously? Only set in INIT */
618 unsigned async_read:1;
620 /** Return an unique read error after abort. Only set in INIT */
621 unsigned abort_err:1;
623 /** Do not send separate SETATTR request before open(O_TRUNC) */
624 unsigned atomic_o_trunc:1;
626 /** Filesystem supports NFS exporting. Only set in INIT */
627 unsigned export_support:1;
629 /** write-back cache policy (default is write-through) */
630 unsigned writeback_cache:1;
632 /** allow parallel lookups and readdir (default is serialized) */
633 unsigned parallel_dirops:1;
635 /** handle fs handles killing suid/sgid/cap on write/chown/trunc */
636 unsigned handle_killpriv:1;
638 /** cache READLINK responses in page cache */
639 unsigned cache_symlinks:1;
641 /* show legacy mount options */
642 unsigned int legacy_opts_show:1;
645 * The following bitfields are only for optimization purposes
646 * and hence races in setting them will not cause malfunction
649 /** Is open/release not implemented by fs? */
652 /** Is opendir/releasedir not implemented by fs? */
653 unsigned no_opendir:1;
655 /** Is fsync not implemented by fs? */
658 /** Is fsyncdir not implemented by fs? */
659 unsigned no_fsyncdir:1;
661 /** Is flush not implemented by fs? */
664 /** Is setxattr not implemented by fs? */
665 unsigned no_setxattr:1;
667 /** Is getxattr not implemented by fs? */
668 unsigned no_getxattr:1;
670 /** Is listxattr not implemented by fs? */
671 unsigned no_listxattr:1;
673 /** Is removexattr not implemented by fs? */
674 unsigned no_removexattr:1;
676 /** Are posix file locking primitives not implemented by fs? */
679 /** Is access not implemented by fs? */
680 unsigned no_access:1;
682 /** Is create not implemented by fs? */
683 unsigned no_create:1;
685 /** Is interrupt not implemented by fs? */
686 unsigned no_interrupt:1;
688 /** Is bmap not implemented by fs? */
691 /** Is poll not implemented by fs? */
694 /** Do multi-page cached writes */
695 unsigned big_writes:1;
697 /** Don't apply umask to creation modes */
698 unsigned dont_mask:1;
700 /** Are BSD file locking primitives not implemented by fs? */
703 /** Is fallocate not implemented by fs? */
704 unsigned no_fallocate:1;
706 /** Is rename with flags implemented by fs? */
707 unsigned no_rename2:1;
709 /** Use enhanced/automatic page cache invalidation. */
710 unsigned auto_inval_data:1;
712 /** Filesystem is fully reponsible for page cache invalidation. */
713 unsigned explicit_inval_data:1;
715 /** Does the filesystem support readdirplus? */
716 unsigned do_readdirplus:1;
718 /** Does the filesystem want adaptive readdirplus? */
719 unsigned readdirplus_auto:1;
721 /** Does the filesystem support asynchronous direct-IO submission? */
722 unsigned async_dio:1;
724 /** Is lseek not implemented by fs? */
727 /** Does the filesystem support posix acls? */
728 unsigned posix_acl:1;
730 /** Check permissions based on the file mode or not? */
731 unsigned default_permissions:1;
733 /** Allow other than the mounter user to access the filesystem ? */
734 unsigned allow_other:1;
736 /** Does the filesystem support copy_file_range? */
737 unsigned no_copy_file_range:1;
739 /* Send DESTROY request */
740 unsigned int destroy:1;
742 /* Delete dentries that have gone stale */
743 unsigned int delete_stale:1;
745 /** Do not create entry in fusectl fs */
746 unsigned int no_control:1;
748 /** Do not allow MNT_FORCE umount */
749 unsigned int no_force_umount:1;
751 /* Auto-mount submounts announced by the server */
752 unsigned int auto_submounts:1;
754 /** The number of requests waiting for completion */
755 atomic_t num_waiting;
757 /** Negotiated minor version */
760 /** Entry on the fuse_mount_list */
761 struct list_head entry;
763 /** Device ID from the root super block */
766 /** Dentries in the control filesystem */
767 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
769 /** number of dentries used in the above array */
772 /** Key for lock owner ID scrambling */
775 /** Version counter for attribute changes */
776 atomic64_t attr_version;
778 /** Called on final put */
779 void (*release)(struct fuse_conn *);
782 * Read/write semaphore to hold when accessing the sb of any
783 * fuse_mount belonging to this connection
785 struct rw_semaphore killsb;
787 /** List of device instances belonging to this connection */
788 struct list_head devices;
790 #ifdef CONFIG_FUSE_DAX
791 /* Dax specific conn data, non-NULL if DAX is enabled */
792 struct fuse_conn_dax *dax;
795 /** List of filesystems using this connection */
796 struct list_head mounts;
800 * Represents a mounted filesystem, potentially a submount.
802 * This object allows sharing a fuse_conn between separate mounts to
803 * allow submounts with dedicated superblocks and thus separate device
807 /* Underlying (potentially shared) connection to the FUSE server */
808 struct fuse_conn *fc;
814 * Super block for this connection (fc->killsb must be held when
817 struct super_block *sb;
819 /* Entry on fc->mounts */
820 struct list_head fc_entry;
823 static inline struct fuse_mount *get_fuse_mount_super(struct super_block *sb)
825 return sb->s_fs_info;
828 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
830 struct fuse_mount *fm = get_fuse_mount_super(sb);
832 return fm ? fm->fc : NULL;
835 static inline struct fuse_mount *get_fuse_mount(struct inode *inode)
837 return get_fuse_mount_super(inode->i_sb);
840 static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
842 struct fuse_mount *fm = get_fuse_mount(inode);
844 return fm ? fm->fc : NULL;
847 static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
849 return container_of(inode, struct fuse_inode, inode);
852 static inline u64 get_node_id(struct inode *inode)
854 return get_fuse_inode(inode)->nodeid;
857 static inline int invalid_nodeid(u64 nodeid)
859 return !nodeid || nodeid == FUSE_ROOT_ID;
862 static inline u64 fuse_get_attr_version(struct fuse_conn *fc)
864 return atomic64_read(&fc->attr_version);
867 static inline bool fuse_stale_inode(const struct inode *inode, int generation,
868 struct fuse_attr *attr)
870 return inode->i_generation != generation ||
871 inode_wrong_type(inode, attr->mode);
874 static inline void fuse_make_bad(struct inode *inode)
876 set_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state);
879 static inline bool fuse_is_bad(struct inode *inode)
881 return unlikely(test_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state));
884 /** Device operations */
885 extern const struct file_operations fuse_dev_operations;
887 extern const struct dentry_operations fuse_dentry_operations;
888 extern const struct dentry_operations fuse_root_dentry_operations;
891 * Get a filled in inode
893 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
894 int generation, struct fuse_attr *attr,
895 u64 attr_valid, u64 attr_version);
897 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
898 struct fuse_entry_out *outarg, struct inode **inode);
901 * Send FORGET command
903 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
904 u64 nodeid, u64 nlookup);
906 struct fuse_forget_link *fuse_alloc_forget(void);
908 struct fuse_forget_link *fuse_dequeue_forget(struct fuse_iqueue *fiq,
910 unsigned int *countp);
913 * Initialize READ or READDIR request
915 struct fuse_io_args {
918 struct fuse_read_in in;
922 struct fuse_write_in in;
923 struct fuse_write_out out;
927 struct fuse_args_pages ap;
928 struct fuse_io_priv *io;
929 struct fuse_file *ff;
932 void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
933 size_t count, int opcode);
937 * Send OPEN or OPENDIR request
939 int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
941 struct fuse_file *fuse_file_alloc(struct fuse_mount *fm);
942 void fuse_file_free(struct fuse_file *ff);
943 void fuse_finish_open(struct inode *inode, struct file *file);
945 void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, int flags);
948 * Send RELEASE or RELEASEDIR request
950 void fuse_release_common(struct file *file, bool isdir);
953 * Send FSYNC or FSYNCDIR request
955 int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
956 int datasync, int opcode);
961 int fuse_notify_poll_wakeup(struct fuse_conn *fc,
962 struct fuse_notify_poll_wakeup_out *outarg);
965 * Initialize file operations on a regular file
967 void fuse_init_file_inode(struct inode *inode);
970 * Initialize inode operations on regular files and special files
972 void fuse_init_common(struct inode *inode);
975 * Initialize inode and file operations on a directory
977 void fuse_init_dir(struct inode *inode);
980 * Initialize inode operations on a symlink
982 void fuse_init_symlink(struct inode *inode);
985 * Change attributes of an inode
987 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
988 u64 attr_valid, u64 attr_version);
990 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
994 * Initialize the client device
996 int fuse_dev_init(void);
999 * Cleanup the client device
1001 void fuse_dev_cleanup(void);
1003 int fuse_ctl_init(void);
1004 void __exit fuse_ctl_cleanup(void);
1007 * Simple request sending that does request allocation and freeing
1009 ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args);
1010 int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
1014 * End a finished request
1016 void fuse_request_end(struct fuse_req *req);
1018 /* Abort all requests */
1019 void fuse_abort_conn(struct fuse_conn *fc);
1020 void fuse_wait_aborted(struct fuse_conn *fc);
1023 * Invalidate inode attributes
1025 void fuse_invalidate_attr(struct inode *inode);
1027 void fuse_invalidate_entry_cache(struct dentry *entry);
1029 void fuse_invalidate_atime(struct inode *inode);
1031 u64 entry_attr_timeout(struct fuse_entry_out *o);
1032 void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o);
1035 * Acquire reference to fuse_conn
1037 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
1040 * Initialize fuse_conn
1042 void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
1043 struct user_namespace *user_ns,
1044 const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv);
1047 * Release reference to fuse_conn
1049 void fuse_conn_put(struct fuse_conn *fc);
1052 * Acquire reference to fuse_mount
1054 struct fuse_mount *fuse_mount_get(struct fuse_mount *fm);
1057 * Release reference to fuse_mount
1059 void fuse_mount_put(struct fuse_mount *fm);
1061 struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc);
1062 struct fuse_dev *fuse_dev_alloc(void);
1063 void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc);
1064 void fuse_dev_free(struct fuse_dev *fud);
1065 void fuse_send_init(struct fuse_mount *fm);
1068 * Fill in superblock and initialize fuse connection
1069 * @sb: partially-initialized superblock to fill in
1070 * @ctx: mount context
1072 int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx);
1075 * Fill in superblock for submounts
1076 * @sb: partially-initialized superblock to fill in
1077 * @parent_fi: The fuse_inode of the parent filesystem where this submount is
1080 int fuse_fill_super_submount(struct super_block *sb,
1081 struct fuse_inode *parent_fi);
1084 * Remove the mount from the connection
1086 * Returns whether this was the last mount
1088 bool fuse_mount_remove(struct fuse_mount *fm);
1091 * Shut down the connection (possibly sending DESTROY request).
1093 void fuse_conn_destroy(struct fuse_mount *fm);
1096 * Add connection to control filesystem
1098 int fuse_ctl_add_conn(struct fuse_conn *fc);
1101 * Remove connection from control filesystem
1103 void fuse_ctl_remove_conn(struct fuse_conn *fc);
1106 * Is file type valid?
1108 int fuse_valid_type(int m);
1110 bool fuse_invalid_attr(struct fuse_attr *attr);
1113 * Is current process allowed to perform filesystem operation?
1115 int fuse_allow_current_process(struct fuse_conn *fc);
1117 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
1119 void fuse_flush_time_update(struct inode *inode);
1120 void fuse_update_ctime(struct inode *inode);
1122 int fuse_update_attributes(struct inode *inode, struct file *file);
1124 void fuse_flush_writepages(struct inode *inode);
1126 void fuse_set_nowrite(struct inode *inode);
1127 void fuse_release_nowrite(struct inode *inode);
1130 * Scan all fuse_mounts belonging to fc to find the first where
1131 * ilookup5() returns a result. Return that result and the
1132 * respective fuse_mount in *fm (unless fm is NULL).
1134 * The caller must hold fc->killsb.
1136 struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid,
1137 struct fuse_mount **fm);
1140 * File-system tells the kernel to invalidate cache for the given node id.
1142 int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
1143 loff_t offset, loff_t len);
1146 * File-system tells the kernel to invalidate parent attributes and
1147 * the dentry matching parent/name.
1149 * If the child_nodeid is non-zero and:
1150 * - matches the inode number for the dentry matching parent/name,
1151 * - is not a mount point
1152 * - is a file or oan empty directory
1153 * then the dentry is unhashed (d_delete()).
1155 int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
1156 u64 child_nodeid, struct qstr *name);
1158 int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
1162 * fuse_direct_io() flags
1165 /** If set, it is WRITE; otherwise - READ */
1166 #define FUSE_DIO_WRITE (1 << 0)
1168 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
1169 #define FUSE_DIO_CUSE (1 << 1)
1171 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
1172 loff_t *ppos, int flags);
1173 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1174 unsigned int flags);
1175 long fuse_ioctl_common(struct file *file, unsigned int cmd,
1176 unsigned long arg, unsigned int flags);
1177 __poll_t fuse_file_poll(struct file *file, poll_table *wait);
1178 int fuse_dev_release(struct inode *inode, struct file *file);
1180 bool fuse_write_update_size(struct inode *inode, loff_t pos);
1182 int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
1183 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
1185 int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
1188 void fuse_set_initialized(struct fuse_conn *fc);
1190 void fuse_unlock_inode(struct inode *inode, bool locked);
1191 bool fuse_lock_inode(struct inode *inode);
1193 int fuse_setxattr(struct inode *inode, const char *name, const void *value,
1194 size_t size, int flags);
1195 ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
1197 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
1198 int fuse_removexattr(struct inode *inode, const char *name);
1199 extern const struct xattr_handler *fuse_xattr_handlers[];
1200 extern const struct xattr_handler *fuse_acl_xattr_handlers[];
1201 extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
1204 struct posix_acl *fuse_get_acl(struct inode *inode, int type);
1205 int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
1209 int fuse_readdir(struct file *file, struct dir_context *ctx);
1212 * Return the number of bytes in an arguments list
1214 unsigned int fuse_len_args(unsigned int numargs, struct fuse_arg *args);
1217 * Get the next unique ID for a request
1219 u64 fuse_get_unique(struct fuse_iqueue *fiq);
1220 void fuse_free_conn(struct fuse_conn *fc);
1224 #define FUSE_IS_DAX(inode) (IS_ENABLED(CONFIG_FUSE_DAX) && IS_DAX(inode))
1226 ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to);
1227 ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from);
1228 int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma);
1229 int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start, u64 dmap_end);
1230 int fuse_dax_conn_alloc(struct fuse_conn *fc, struct dax_device *dax_dev);
1231 void fuse_dax_conn_free(struct fuse_conn *fc);
1232 bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi);
1233 void fuse_dax_inode_init(struct inode *inode);
1234 void fuse_dax_inode_cleanup(struct inode *inode);
1235 bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
1236 void fuse_dax_cancel_work(struct fuse_conn *fc);
1238 #endif /* _FS_FUSE_I_H */