2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
5 This program can be distributed under the terms of the GNU LGPLv2.
6 See the file COPYING.LIB.
14 * This file defines the library interface of FUSE
16 * IMPORTANT: you should define FUSE_USE_VERSION before including this
17 * header. To use the newest API define it to 26 (recommended for any
18 * new application), to use the old API define it to 21 (default) 22
19 * or 25, to use the even older 1.X API define it to 11.
22 #ifndef FUSE_USE_VERSION
23 #define FUSE_USE_VERSION 21
26 #include "fuse_common.h"
31 #include <sys/types.h>
33 #include <sys/statvfs.h>
40 /* ----------------------------------------------------------- *
42 * ----------------------------------------------------------- */
44 /** Handle for a FUSE filesystem */
47 /** Structure containing a raw command */
50 /** Function to add an entry in a readdir() operation
52 * @param buf the buffer passed to the readdir() operation
53 * @param name the file name of the directory entry
54 * @param stat file attributes, can be NULL
55 * @param off offset of the next entry or zero
56 * @return 1 if buffer is full, zero otherwise
58 typedef int (*fuse_fill_dir_t) (void *buf, const char *name,
59 const struct stat *stbuf, off_t off);
61 /* Used by deprecated getdir() method */
62 typedef struct fuse_dirhandle *fuse_dirh_t;
63 typedef int (*fuse_dirfil_t) (fuse_dirh_t h, const char *name, int type,
67 * The file system operations:
69 * Most of these should work very similarly to the well known UNIX
70 * file system operations. A major exception is that instead of
71 * returning an error in 'errno', the operation should return the
72 * negated error value (-errno) directly.
74 * All methods are optional, but some are essential for a useful
75 * filesystem (e.g. getattr). Open, flush, release, fsync, opendir,
76 * releasedir, fsyncdir, access, create, ftruncate, fgetattr, lock,
77 * init and destroy are special purpose methods, without which a full
78 * featured filesystem can still be implemented.
80 * Almost all operations take a path which can be of any length.
82 * Changed in fuse 2.8.0 (regardless of API version)
83 * Previously, paths were limited to a length of PATH_MAX.
85 * See http://fuse.sourceforge.net/wiki/ for more information. There
86 * is also a snapshot of the relevant wiki pages in the doc/ folder.
88 struct fuse_operations {
89 /** Get file attributes.
91 * Similar to stat(). The 'st_dev' and 'st_blksize' fields are
92 * ignored. The 'st_ino' field is ignored except if the 'use_ino'
93 * mount option is given.
95 int (*getattr) (const char *, struct stat *);
97 /** Read the target of a symbolic link
99 * The buffer should be filled with a null terminated string. The
100 * buffer size argument includes the space for the terminating
101 * null character. If the linkname is too long to fit in the
102 * buffer, it should be truncated. The return value should be 0
105 int (*readlink) (const char *, char *, size_t);
107 /* Deprecated, use readdir() instead */
108 int (*getdir) (const char *, fuse_dirh_t, fuse_dirfil_t);
110 /** Create a file node
112 * This is called for creation of all non-directory, non-symlink
113 * nodes. If the filesystem defines a create() method, then for
114 * regular files that will be called instead.
116 int (*mknod) (const char *, mode_t, dev_t);
118 /** Create a directory
120 * Note that the mode argument may not have the type specification
121 * bits set, i.e. S_ISDIR(mode) can be false. To obtain the
122 * correct directory type bits use mode|S_IFDIR
124 int (*mkdir) (const char *, mode_t);
127 int (*unlink) (const char *);
129 /** Remove a directory */
130 int (*rmdir) (const char *);
132 /** Create a symbolic link */
133 int (*symlink) (const char *, const char *);
136 int (*rename) (const char *, const char *);
138 /** Create a hard link to a file */
139 int (*link) (const char *, const char *);
141 /** Change the permission bits of a file */
142 int (*chmod) (const char *, mode_t);
144 /** Change the owner and group of a file */
145 int (*chown) (const char *, uid_t, gid_t);
147 /** Change the size of a file */
148 int (*truncate) (const char *, off_t);
150 /** Change the access and/or modification times of a file
152 * Deprecated, use utimens() instead.
154 int (*utime) (const char *, struct utimbuf *);
156 /** File open operation
158 * No creation (O_CREAT, O_EXCL) and by default also no
159 * truncation (O_TRUNC) flags will be passed to open(). If an
160 * application specifies O_TRUNC, fuse first calls truncate()
161 * and then open(). Only if 'atomic_o_trunc' has been
162 * specified and kernel version is 2.6.24 or later, O_TRUNC is
165 * Unless the 'default_permissions' mount option is given,
166 * open should check if the operation is permitted for the
167 * given flags. Optionally open may also return an arbitrary
168 * filehandle in the fuse_file_info structure, which will be
169 * passed to all file operations.
171 * Changed in version 2.2
173 int (*open) (const char *, struct fuse_file_info *);
175 /** Read data from an open file
177 * Read should return exactly the number of bytes requested except
178 * on EOF or error, otherwise the rest of the data will be
179 * substituted with zeroes. An exception to this is when the
180 * 'direct_io' mount option is specified, in which case the return
181 * value of the read system call will reflect the return value of
184 * Changed in version 2.2
186 int (*read) (const char *, char *, size_t, off_t,
187 struct fuse_file_info *);
189 /** Write data to an open file
191 * Write should return exactly the number of bytes requested
192 * except on error. An exception to this is when the 'direct_io'
193 * mount option is specified (see read operation).
195 * Changed in version 2.2
197 int (*write) (const char *, const char *, size_t, off_t,
198 struct fuse_file_info *);
200 /** Get file system statistics
202 * The 'f_frsize', 'f_favail', 'f_fsid' and 'f_flag' fields are ignored
204 * Replaced 'struct statfs' parameter with 'struct statvfs' in
207 int (*statfs) (const char *, struct statvfs *);
209 /** Possibly flush cached data
211 * BIG NOTE: This is not equivalent to fsync(). It's not a
212 * request to sync dirty data.
214 * Flush is called on each close() of a file descriptor. So if a
215 * filesystem wants to return write errors in close() and the file
216 * has cached dirty data, this is a good place to write back data
217 * and return any errors. Since many applications ignore close()
218 * errors this is not always useful.
220 * NOTE: The flush() method may be called more than once for each
221 * open(). This happens if more than one file descriptor refers
222 * to an opened file due to dup(), dup2() or fork() calls. It is
223 * not possible to determine if a flush is final, so each flush
224 * should be treated equally. Multiple write-flush sequences are
225 * relatively rare, so this shouldn't be a problem.
227 * Filesystems shouldn't assume that flush will always be called
228 * after some writes, or that if will be called at all.
230 * Changed in version 2.2
232 int (*flush) (const char *, struct fuse_file_info *);
234 /** Release an open file
236 * Release is called when there are no more references to an open
237 * file: all file descriptors are closed and all memory mappings
240 * For every open() call there will be exactly one release() call
241 * with the same flags and file descriptor. It is possible to
242 * have a file opened more than once, in which case only the last
243 * release will mean, that no more reads/writes will happen on the
244 * file. The return value of release is ignored.
246 * Changed in version 2.2
248 int (*release) (const char *, struct fuse_file_info *);
250 /** Synchronize file contents
252 * If the datasync parameter is non-zero, then only the user data
253 * should be flushed, not the meta data.
255 * Changed in version 2.2
257 int (*fsync) (const char *, int, struct fuse_file_info *);
259 /** Set extended attributes */
260 int (*setxattr) (const char *, const char *, const char *, size_t, int);
262 /** Get extended attributes */
263 int (*getxattr) (const char *, const char *, char *, size_t);
265 /** List extended attributes */
266 int (*listxattr) (const char *, char *, size_t);
268 /** Remove extended attributes */
269 int (*removexattr) (const char *, const char *);
273 * Unless the 'default_permissions' mount option is given,
274 * this method should check if opendir is permitted for this
275 * directory. Optionally opendir may also return an arbitrary
276 * filehandle in the fuse_file_info structure, which will be
277 * passed to readdir, closedir and fsyncdir.
279 * Introduced in version 2.3
281 int (*opendir) (const char *, struct fuse_file_info *);
285 * This supersedes the old getdir() interface. New applications
288 * The filesystem may choose between two modes of operation:
290 * 1) The readdir implementation ignores the offset parameter, and
291 * passes zero to the filler function's offset. The filler
292 * function will not return '1' (unless an error happens), so the
293 * whole directory is read in a single readdir operation. This
294 * works just like the old getdir() method.
296 * 2) The readdir implementation keeps track of the offsets of the
297 * directory entries. It uses the offset parameter and always
298 * passes non-zero offset to the filler function. When the buffer
299 * is full (or an error happens) the filler function will return
302 * Introduced in version 2.3
304 int (*readdir) (const char *, void *, fuse_fill_dir_t, off_t,
305 struct fuse_file_info *);
307 /** Release directory
309 * Introduced in version 2.3
311 int (*releasedir) (const char *, struct fuse_file_info *);
313 /** Synchronize directory contents
315 * If the datasync parameter is non-zero, then only the user data
316 * should be flushed, not the meta data
318 * Introduced in version 2.3
320 int (*fsyncdir) (const char *, int, struct fuse_file_info *);
323 * Initialize filesystem
325 * The return value will passed in the private_data field of
326 * fuse_context to all file operations and as a parameter to the
329 * Introduced in version 2.3
330 * Changed in version 2.6
332 void *(*init) (struct fuse_conn_info *conn);
335 * Clean up filesystem
337 * Called on filesystem exit.
339 * Introduced in version 2.3
341 void (*destroy) (void *);
344 * Check file access permissions
346 * This will be called for the access() system call. If the
347 * 'default_permissions' mount option is given, this method is not
350 * This method is not called under Linux kernel versions 2.4.x
352 * Introduced in version 2.5
354 int (*access) (const char *, int);
357 * Create and open a file
359 * If the file does not exist, first create it with the specified
360 * mode, and then open it.
362 * If this method is not implemented or under Linux kernel
363 * versions earlier than 2.6.15, the mknod() and open() methods
364 * will be called instead.
366 * Introduced in version 2.5
368 int (*create) (const char *, mode_t, struct fuse_file_info *);
371 * Change the size of an open file
373 * This method is called instead of the truncate() method if the
374 * truncation was invoked from an ftruncate() system call.
376 * If this method is not implemented or under Linux kernel
377 * versions earlier than 2.6.15, the truncate() method will be
380 * Introduced in version 2.5
382 int (*ftruncate) (const char *, off_t, struct fuse_file_info *);
385 * Get attributes from an open file
387 * This method is called instead of the getattr() method if the
388 * file information is available.
390 * Currently this is only called after the create() method if that
391 * is implemented (see above). Later it may be called for
392 * invocations of fstat() too.
394 * Introduced in version 2.5
396 int (*fgetattr) (const char *, struct stat *, struct fuse_file_info *);
399 * Perform POSIX file locking operation
401 * The cmd argument will be either F_GETLK, F_SETLK or F_SETLKW.
403 * For the meaning of fields in 'struct flock' see the man page
404 * for fcntl(2). The l_whence field will always be set to
407 * For checking lock ownership, the 'fuse_file_info->owner'
408 * argument must be used.
410 * For F_GETLK operation, the library will first check currently
411 * held locks, and if a conflicting lock is found it will return
412 * information without calling this method. This ensures, that
413 * for local locks the l_pid field is correctly filled in. The
414 * results may not be accurate in case of race conditions and in
415 * the presence of hard links, but it's unlikely that an
416 * application would rely on accurate GETLK results in these
417 * cases. If a conflicting lock is not found, this method will be
418 * called, and the filesystem may fill out l_pid by a meaningful
419 * value, or it may leave this field zero.
421 * For F_SETLK and F_SETLKW the l_pid field will be set to the pid
422 * of the process performing the locking operation.
424 * Note: if this method is not implemented, the kernel will still
425 * allow file locking to work locally. Hence it is only
426 * interesting for network filesystems and similar.
428 * Introduced in version 2.6
430 int (*lock) (const char *, struct fuse_file_info *, int cmd,
434 * Change the access and modification times of a file with
435 * nanosecond resolution
437 * This supersedes the old utime() interface. New applications
440 * See the utimensat(2) man page for details.
442 * Introduced in version 2.6
444 int (*utimens) (const char *, const struct timespec tv[2]);
447 * Map block index within file to block index within device
449 * Note: This makes sense only for block device backed filesystems
450 * mounted with the 'blkdev' option
452 * Introduced in version 2.6
454 int (*bmap) (const char *, size_t blocksize, uint64_t *idx);
457 * Flag indicating that the filesystem can accept a NULL path
458 * as the first argument for the following operations:
460 * read, write, flush, release, fsync, readdir, releasedir,
461 * fsyncdir, ftruncate, fgetattr, lock, ioctl and poll
463 * If this flag is set these operations continue to work on
464 * unlinked files even if "-ohard_remove" option was specified.
466 unsigned int flag_nullpath_ok:1;
469 * Flag indicating that the path need not be calculated for
470 * the following operations:
472 * read, write, flush, release, fsync, readdir, releasedir,
473 * fsyncdir, ftruncate, fgetattr, lock, ioctl and poll
475 * Closely related to flag_nullpath_ok, but if this flag is
476 * set then the path will not be calculaged even if the file
477 * wasn't unlinked. However the path can still be non-NULL if
478 * it needs to be calculated for some other reason.
480 unsigned int flag_nopath:1;
483 * Flag indicating that the filesystem accepts special
484 * UTIME_NOW and UTIME_OMIT values in its utimens operation.
486 unsigned int flag_utime_omit_ok:1;
489 * Reserved flags, don't set
491 unsigned int flag_reserved:29;
496 * flags will have FUSE_IOCTL_COMPAT set for 32bit ioctls in
497 * 64bit environment. The size and direction of data is
498 * determined by _IOC_*() decoding of cmd. For _IOC_NONE,
499 * data will be NULL, for _IOC_WRITE data is out area, for
500 * _IOC_READ in area and if both are set in/out area. In all
501 * non-NULL cases, the area is of _IOC_SIZE(cmd) bytes.
503 * Introduced in version 2.8
505 int (*ioctl) (const char *, int cmd, void *arg,
506 struct fuse_file_info *, unsigned int flags, void *data);
509 * Poll for IO readiness events
511 * Note: If ph is non-NULL, the client should notify
512 * when IO readiness events occur by calling
513 * fuse_notify_poll() with the specified ph.
515 * Regardless of the number of times poll with a non-NULL ph
516 * is received, single notification is enough to clear all.
517 * Notifying more times incurs overhead but doesn't harm
520 * The callee is responsible for destroying ph with
521 * fuse_pollhandle_destroy() when no longer in use.
523 * Introduced in version 2.8
525 int (*poll) (const char *, struct fuse_file_info *,
526 struct fuse_pollhandle *ph, unsigned *reventsp);
528 /** Write contents of buffer to an open file
530 * Similar to the write() method, but data is supplied in a
531 * generic buffer. Use fuse_buf_copy() to transfer data to
534 * Introduced in version 2.9
536 int (*write_buf) (const char *, struct fuse_bufvec *buf, off_t off,
537 struct fuse_file_info *);
539 /** Store data from an open file in a buffer
541 * Similar to the read() method, but data is stored and
542 * returned in a generic buffer.
544 * No actual copying of data has to take place, the source
545 * file descriptor may simply be stored in the buffer for
546 * later data transfer.
548 * The buffer must be allocated dynamically and stored at the
549 * location pointed to by bufp. If the buffer contains memory
550 * regions, they too must be allocated using malloc(). The
551 * allocated memory will be freed by the caller.
553 * Introduced in version 2.9
555 int (*read_buf) (const char *, struct fuse_bufvec **bufp,
556 size_t size, off_t off, struct fuse_file_info *);
558 * Perform BSD file locking operation
560 * The op argument will be either LOCK_SH, LOCK_EX or LOCK_UN
562 * Nonblocking requests will be indicated by ORing LOCK_NB to
563 * the above operations
565 * For more information see the flock(2) manual page.
567 * Additionally fi->owner will be set to a value unique to
568 * this open file. This same value will be supplied to
569 * ->release() when the file is released.
571 * Note: if this method is not implemented, the kernel will still
572 * allow file locking to work locally. Hence it is only
573 * interesting for network filesystems and similar.
575 * Introduced in version 2.9
577 int (*flock) (const char *, struct fuse_file_info *, int op);
580 * Allocates space for an open file
582 * This function ensures that required space is allocated for specified
583 * file. If this function returns success then any subsequent write
584 * request to specified range is guaranteed not to fail because of lack
585 * of space on the file system media.
587 * Introduced in version 2.9.1
589 int (*fallocate) (const char *, int, off_t, off_t,
590 struct fuse_file_info *);
593 /** Extra context that may be needed by some filesystems
595 * The uid, gid and pid fields are not filled in case of a writepage
598 struct fuse_context {
599 /** Pointer to the fuse object */
602 /** User ID of the calling process */
605 /** Group ID of the calling process */
608 /** Thread ID of the calling process */
611 /** Private filesystem data */
614 /** Umask of the calling process (introduced in version 2.8) */
619 * Main function of FUSE.
621 * This is for the lazy. This is all that has to be called from the
624 * This function does the following:
625 * - parses command line options (-d -s and -h)
626 * - passes relevant mount options to the fuse_mount()
627 * - installs signal handlers for INT, HUP, TERM and PIPE
628 * - registers an exit handler to unmount the filesystem on program exit
629 * - creates a fuse handle
630 * - registers the operations
631 * - calls either the single-threaded or the multi-threaded event loop
633 * Note: this is currently implemented as a macro.
635 * @param argc the argument counter passed to the main() function
636 * @param argv the argument vector passed to the main() function
637 * @param op the file system operation
638 * @param user_data user data supplied in the context during the init() method
639 * @return 0 on success, nonzero on failure
642 int fuse_main(int argc, char *argv[], const struct fuse_operations *op,
645 #define fuse_main(argc, argv, op, user_data) \
646 fuse_main_real(argc, argv, op, sizeof(*(op)), user_data)
648 /* ----------------------------------------------------------- *
649 * More detailed API *
650 * ----------------------------------------------------------- */
653 * Create a new FUSE filesystem.
655 * @param ch the communication channel
656 * @param args argument vector
657 * @param op the filesystem operations
658 * @param op_size the size of the fuse_operations structure
659 * @param user_data user data supplied in the context during the init() method
660 * @return the created FUSE handle
662 struct fuse *fuse_new(struct fuse_chan *ch, struct fuse_args *args,
663 const struct fuse_operations *op, size_t op_size,
667 * Destroy the FUSE handle.
669 * The communication channel attached to the handle is also destroyed.
671 * NOTE: This function does not unmount the filesystem. If this is
672 * needed, call fuse_unmount() before calling this function.
674 * @param f the FUSE handle
676 void fuse_destroy(struct fuse *f);
681 * Requests from the kernel are processed, and the appropriate
682 * operations are called.
684 * @param f the FUSE handle
685 * @return 0 if no error occurred, -1 otherwise
687 int fuse_loop(struct fuse *f);
690 * Exit from event loop
692 * @param f the FUSE handle
694 void fuse_exit(struct fuse *f);
697 * FUSE event loop with multiple threads
699 * Requests from the kernel are processed, and the appropriate
700 * operations are called. Request are processed in parallel by
701 * distributing them between multiple threads.
703 * Calling this function requires the pthreads library to be linked to
706 * @param f the FUSE handle
707 * @return 0 if no error occurred, -1 otherwise
709 int fuse_loop_mt(struct fuse *f);
712 * Get the current context
714 * The context is only valid for the duration of a filesystem
715 * operation, and thus must not be stored and used later.
717 * @return the context
719 struct fuse_context *fuse_get_context(void);
722 * Get the current supplementary group IDs for the current request
724 * Similar to the getgroups(2) system call, except the return value is
725 * always the total number of group IDs, even if it is larger than the
728 * The current fuse kernel module in linux (as of 2.6.30) doesn't pass
729 * the group list to userspace, hence this function needs to parse
730 * "/proc/$TID/task/$TID/status" to get the group IDs.
732 * This feature may not be supported on all operating systems. In
733 * such a case this function will return -ENOSYS.
735 * @param size size of given array
736 * @param list array of group IDs to be filled in
737 * @return the total number of supplementary group IDs or -errno on failure
739 int fuse_getgroups(int size, gid_t list[]);
742 * Check if the current request has already been interrupted
744 * @return 1 if the request has been interrupted, 0 otherwise
746 int fuse_interrupted(void);
749 * Obsolete, doesn't do anything
753 int fuse_invalidate(struct fuse *f, const char *path);
755 /* Deprecated, don't use */
756 int fuse_is_lib_option(const char *opt);
759 * The real main function
761 * Do not call this directly, use fuse_main()
763 int fuse_main_real(int argc, char *argv[], const struct fuse_operations *op,
764 size_t op_size, void *user_data);
767 * Start the cleanup thread when using option "remember".
769 * This is done automatically by fuse_loop_mt()
770 * @param fuse struct fuse pointer for fuse instance
771 * @return 0 on success and -1 on error
773 int fuse_start_cleanup_thread(struct fuse *fuse);
776 * Stop the cleanup thread when using option "remember".
778 * This is done automatically by fuse_loop_mt()
779 * @param fuse struct fuse pointer for fuse instance
781 void fuse_stop_cleanup_thread(struct fuse *fuse);
784 * Iterate over cache removing stale entries
785 * use in conjunction with "-oremember"
787 * NOTE: This is already done for the standard sessions
789 * @param fuse struct fuse pointer for fuse instance
790 * @return the number of seconds until the next cleanup
792 int fuse_clean_cache(struct fuse *fuse);
799 * Fuse filesystem object
801 * This is opaque object represents a filesystem layer
806 * These functions call the relevant filesystem operation, and return
809 * If the operation is not defined, they return -ENOSYS, with the
810 * exception of fuse_fs_open, fuse_fs_release, fuse_fs_opendir,
811 * fuse_fs_releasedir and fuse_fs_statfs, which return 0.
814 int fuse_fs_getattr(struct fuse_fs *fs, const char *path, struct stat *buf);
815 int fuse_fs_fgetattr(struct fuse_fs *fs, const char *path, struct stat *buf,
816 struct fuse_file_info *fi);
817 int fuse_fs_rename(struct fuse_fs *fs, const char *oldpath,
818 const char *newpath);
819 int fuse_fs_unlink(struct fuse_fs *fs, const char *path);
820 int fuse_fs_rmdir(struct fuse_fs *fs, const char *path);
821 int fuse_fs_symlink(struct fuse_fs *fs, const char *linkname,
823 int fuse_fs_link(struct fuse_fs *fs, const char *oldpath, const char *newpath);
824 int fuse_fs_release(struct fuse_fs *fs, const char *path,
825 struct fuse_file_info *fi);
826 int fuse_fs_open(struct fuse_fs *fs, const char *path,
827 struct fuse_file_info *fi);
828 int fuse_fs_read(struct fuse_fs *fs, const char *path, char *buf, size_t size,
829 off_t off, struct fuse_file_info *fi);
830 int fuse_fs_read_buf(struct fuse_fs *fs, const char *path,
831 struct fuse_bufvec **bufp, size_t size, off_t off,
832 struct fuse_file_info *fi);
833 int fuse_fs_write(struct fuse_fs *fs, const char *path, const char *buf,
834 size_t size, off_t off, struct fuse_file_info *fi);
835 int fuse_fs_write_buf(struct fuse_fs *fs, const char *path,
836 struct fuse_bufvec *buf, off_t off,
837 struct fuse_file_info *fi);
838 int fuse_fs_fsync(struct fuse_fs *fs, const char *path, int datasync,
839 struct fuse_file_info *fi);
840 int fuse_fs_flush(struct fuse_fs *fs, const char *path,
841 struct fuse_file_info *fi);
842 int fuse_fs_statfs(struct fuse_fs *fs, const char *path, struct statvfs *buf);
843 int fuse_fs_opendir(struct fuse_fs *fs, const char *path,
844 struct fuse_file_info *fi);
845 int fuse_fs_readdir(struct fuse_fs *fs, const char *path, void *buf,
846 fuse_fill_dir_t filler, off_t off,
847 struct fuse_file_info *fi);
848 int fuse_fs_fsyncdir(struct fuse_fs *fs, const char *path, int datasync,
849 struct fuse_file_info *fi);
850 int fuse_fs_releasedir(struct fuse_fs *fs, const char *path,
851 struct fuse_file_info *fi);
852 int fuse_fs_create(struct fuse_fs *fs, const char *path, mode_t mode,
853 struct fuse_file_info *fi);
854 int fuse_fs_lock(struct fuse_fs *fs, const char *path,
855 struct fuse_file_info *fi, int cmd, struct flock *lock);
856 int fuse_fs_flock(struct fuse_fs *fs, const char *path,
857 struct fuse_file_info *fi, int op);
858 int fuse_fs_chmod(struct fuse_fs *fs, const char *path, mode_t mode);
859 int fuse_fs_chown(struct fuse_fs *fs, const char *path, uid_t uid, gid_t gid);
860 int fuse_fs_truncate(struct fuse_fs *fs, const char *path, off_t size);
861 int fuse_fs_ftruncate(struct fuse_fs *fs, const char *path, off_t size,
862 struct fuse_file_info *fi);
863 int fuse_fs_utimens(struct fuse_fs *fs, const char *path,
864 const struct timespec tv[2]);
865 int fuse_fs_access(struct fuse_fs *fs, const char *path, int mask);
866 int fuse_fs_readlink(struct fuse_fs *fs, const char *path, char *buf,
868 int fuse_fs_mknod(struct fuse_fs *fs, const char *path, mode_t mode,
870 int fuse_fs_mkdir(struct fuse_fs *fs, const char *path, mode_t mode);
871 int fuse_fs_setxattr(struct fuse_fs *fs, const char *path, const char *name,
872 const char *value, size_t size, int flags);
873 int fuse_fs_getxattr(struct fuse_fs *fs, const char *path, const char *name,
874 char *value, size_t size);
875 int fuse_fs_listxattr(struct fuse_fs *fs, const char *path, char *list,
877 int fuse_fs_removexattr(struct fuse_fs *fs, const char *path,
879 int fuse_fs_bmap(struct fuse_fs *fs, const char *path, size_t blocksize,
881 int fuse_fs_ioctl(struct fuse_fs *fs, const char *path, int cmd, void *arg,
882 struct fuse_file_info *fi, unsigned int flags, void *data);
883 int fuse_fs_poll(struct fuse_fs *fs, const char *path,
884 struct fuse_file_info *fi, struct fuse_pollhandle *ph,
886 int fuse_fs_fallocate(struct fuse_fs *fs, const char *path, int mode,
887 off_t offset, off_t length, struct fuse_file_info *fi);
888 void fuse_fs_init(struct fuse_fs *fs, struct fuse_conn_info *conn);
889 void fuse_fs_destroy(struct fuse_fs *fs);
891 int fuse_notify_poll(struct fuse_pollhandle *ph);
894 * Create a new fuse filesystem object
896 * This is usually called from the factory of a fuse module to create
897 * a new instance of a filesystem.
899 * @param op the filesystem operations
900 * @param op_size the size of the fuse_operations structure
901 * @param user_data user data supplied in the context during the init() method
902 * @return a new filesystem object
904 struct fuse_fs *fuse_fs_new(const struct fuse_operations *op, size_t op_size,
910 * Filesystem modules are registered with the FUSE_REGISTER_MODULE()
913 * If the "-omodules=modname:..." option is present, filesystem
914 * objects are created and pushed onto the stack with the 'factory'
924 * Factory for creating filesystem objects
926 * The function may use and remove options from 'args' that belong
929 * For now the 'fs' vector always contains exactly one filesystem.
930 * This is the filesystem which will be below the newly created
931 * filesystem in the stack.
933 * @param args the command line arguments
934 * @param fs NULL terminated filesystem object vector
935 * @return the new filesystem object
937 struct fuse_fs *(*factory)(struct fuse_args *args,
938 struct fuse_fs *fs[]);
940 struct fuse_module *next;
941 struct fusemod_so *so;
946 * Register a filesystem module
948 * This function is used by FUSE_REGISTER_MODULE and there's usually
949 * no need to call it directly
951 void fuse_register_module(struct fuse_module *mod);
954 * Register filesystem module
956 * For the parameters, see description of the fields in 'struct
959 #define FUSE_REGISTER_MODULE(name_, factory_) \
960 static __attribute__((constructor)) void name_ ## _register(void) \
962 static struct fuse_module mod = \
963 { #name_, factory_, NULL, NULL, 0 }; \
964 fuse_register_module(&mod); \
968 /* ----------------------------------------------------------- *
969 * Advanced API for event handling, don't worry about this... *
970 * ----------------------------------------------------------- */
972 /* NOTE: the following functions are deprecated, and will be removed
973 from the 3.0 API. Use the lowlevel session functions instead */
975 /** Function type used to process commands */
976 typedef void (*fuse_processor_t)(struct fuse *, struct fuse_cmd *, void *);
978 /** This is the part of fuse_main() before the event loop */
979 struct fuse *fuse_setup(int argc, char *argv[],
980 const struct fuse_operations *op, size_t op_size,
981 char **mountpoint, int *multithreaded,
984 /** This is the part of fuse_main() after the event loop */
985 void fuse_teardown(struct fuse *fuse, char *mountpoint);
987 /** Read a single command. If none are read, return NULL */
988 struct fuse_cmd *fuse_read_cmd(struct fuse *f);
990 /** Process a single command */
991 void fuse_process_cmd(struct fuse *f, struct fuse_cmd *cmd);
993 /** Multi threaded event loop, which calls the custom command
994 processor function */
995 int fuse_loop_mt_proc(struct fuse *f, fuse_processor_t proc, void *data);
997 /** Return the exited flag, which indicates if fuse_exit() has been
999 int fuse_exited(struct fuse *f);
1001 /** This function is obsolete and implemented as a no-op */
1002 void fuse_set_getcontext_func(struct fuse_context *(*func)(void));
1004 /** Get session from fuse object */
1005 struct fuse_session *fuse_get_session(struct fuse *f);
1007 /* ----------------------------------------------------------- *
1008 * Compatibility stuff *
1009 * ----------------------------------------------------------- */
1011 #if FUSE_USE_VERSION < 26
1012 # include "fuse_compat.h"
1014 # if FUSE_USE_VERSION == 25
1015 # define fuse_main(argc, argv, op) \
1016 fuse_main_real_compat25(argc, argv, op, sizeof(*(op)))
1017 # define fuse_new fuse_new_compat25
1018 # define fuse_setup fuse_setup_compat25
1019 # define fuse_teardown fuse_teardown_compat22
1020 # define fuse_operations fuse_operations_compat25
1021 # elif FUSE_USE_VERSION == 22
1022 # define fuse_main(argc, argv, op) \
1023 fuse_main_real_compat22(argc, argv, op, sizeof(*(op)))
1024 # define fuse_new fuse_new_compat22
1025 # define fuse_setup fuse_setup_compat22
1026 # define fuse_teardown fuse_teardown_compat22
1027 # define fuse_operations fuse_operations_compat22
1028 # define fuse_file_info fuse_file_info_compat
1029 # elif FUSE_USE_VERSION == 24
1030 # error Compatibility with high-level API version 24 not supported
1032 # define fuse_dirfil_t fuse_dirfil_t_compat
1033 # define __fuse_read_cmd fuse_read_cmd
1034 # define __fuse_process_cmd fuse_process_cmd
1035 # define __fuse_loop_mt fuse_loop_mt_proc
1036 # if FUSE_USE_VERSION == 21
1037 # define fuse_operations fuse_operations_compat2
1038 # define fuse_main fuse_main_compat2
1039 # define fuse_new fuse_new_compat2
1040 # define __fuse_setup fuse_setup_compat2
1041 # define __fuse_teardown fuse_teardown_compat22
1042 # define __fuse_exited fuse_exited
1043 # define __fuse_set_getcontext_func fuse_set_getcontext_func
1045 # define fuse_statfs fuse_statfs_compat1
1046 # define fuse_operations fuse_operations_compat1
1047 # define fuse_main fuse_main_compat1
1048 # define fuse_new fuse_new_compat1
1049 # define FUSE_DEBUG FUSE_DEBUG_COMPAT1
1058 #endif /* _FUSE_H_ */