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root/include/linux/fuse.h

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INCLUDED FROM


/*
    FUSE: Filesystem in Userspace
    Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>

    This program can be distributed under the terms of the GNU GPL.
    See the file COPYING.
*/

/*
 * This file defines the kernel interface of FUSE
 *
 * Protocol changelog:
 *
 * 7.9:
 *  - new fuse_getattr_in input argument of GETATTR
 *  - add lk_flags in fuse_lk_in
 *  - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
 *  - add blksize field to fuse_attr
 *  - add file flags field to fuse_read_in and fuse_write_in
 */

#include <asm/types.h>
#include <linux/major.h>

/** Version number of this interface */
#define FUSE_KERNEL_VERSION 7

/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 9

/** The node ID of the root inode */
#define FUSE_ROOT_ID 1

/** The major number of the fuse character device */
#define FUSE_MAJOR MISC_MAJOR

/** The minor number of the fuse character device */
#define FUSE_MINOR 229

/* Make sure all structures are padded to 64bit boundary, so 32bit
   userspace works under 64bit kernels */

struct fuse_attr {
        __u64   ino;
        __u64   size;
        __u64   blocks;
        __u64   atime;
        __u64   mtime;
        __u64   ctime;
        __u32   atimensec;
        __u32   mtimensec;
        __u32   ctimensec;
        __u32   mode;
        __u32   nlink;
        __u32   uid;
        __u32   gid;
        __u32   rdev;
        __u32   blksize;
        __u32   padding;
};

struct fuse_kstatfs {
        __u64   blocks;
        __u64   bfree;
        __u64   bavail;
        __u64   files;
        __u64   ffree;
        __u32   bsize;
        __u32   namelen;
        __u32   frsize;
        __u32   padding;
        __u32   spare[6];
};

struct fuse_file_lock {
        __u64   start;
        __u64   end;
        __u32   type;
        __u32   pid; /* tgid */
};

/**
 * Bitmasks for fuse_setattr_in.valid
 */
#define FATTR_MODE      (1 << 0)
#define FATTR_UID       (1 << 1)
#define FATTR_GID       (1 << 2)
#define FATTR_SIZE      (1 << 3)
#define FATTR_ATIME     (1 << 4)
#define FATTR_MTIME     (1 << 5)
#define FATTR_FH        (1 << 6)
#define FATTR_ATIME_NOW (1 << 7)
#define FATTR_MTIME_NOW (1 << 8)
#define FATTR_LOCKOWNER (1 << 9)

/**
 * Flags returned by the OPEN request
 *
 * FOPEN_DIRECT_IO: bypass page cache for this open file
 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 */
#define FOPEN_DIRECT_IO         (1 << 0)
#define FOPEN_KEEP_CACHE        (1 << 1)

/**
 * INIT request/reply flags
 *
 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 */
#define FUSE_ASYNC_READ         (1 << 0)
#define FUSE_POSIX_LOCKS        (1 << 1)
#define FUSE_FILE_OPS           (1 << 2)
#define FUSE_ATOMIC_O_TRUNC     (1 << 3)
#define FUSE_EXPORT_SUPPORT     (1 << 4)
#define FUSE_BIG_WRITES         (1 << 5)

/**
 * Release flags
 */
#define FUSE_RELEASE_FLUSH      (1 << 0)

/**
 * Getattr flags
 */
#define FUSE_GETATTR_FH         (1 << 0)

/**
 * Lock flags
 */
#define FUSE_LK_FLOCK           (1 << 0)

/**
 * WRITE flags
 *
 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 */
#define FUSE_WRITE_CACHE        (1 << 0)
#define FUSE_WRITE_LOCKOWNER    (1 << 1)

/**
 * Read flags
 */
#define FUSE_READ_LOCKOWNER     (1 << 1)

enum fuse_opcode {
        FUSE_LOOKUP        = 1,
        FUSE_FORGET        = 2,  /* no reply */
        FUSE_GETATTR       = 3,
        FUSE_SETATTR       = 4,
        FUSE_READLINK      = 5,
        FUSE_SYMLINK       = 6,
        FUSE_MKNOD         = 8,
        FUSE_MKDIR         = 9,
        FUSE_UNLINK        = 10,
        FUSE_RMDIR         = 11,
        FUSE_RENAME        = 12,
        FUSE_LINK          = 13,
        FUSE_OPEN          = 14,
        FUSE_READ          = 15,
        FUSE_WRITE         = 16,
        FUSE_STATFS        = 17,
        FUSE_RELEASE       = 18,
        FUSE_FSYNC         = 20,
        FUSE_SETXATTR      = 21,
        FUSE_GETXATTR      = 22,
        FUSE_LISTXATTR     = 23,
        FUSE_REMOVEXATTR   = 24,
        FUSE_FLUSH         = 25,
        FUSE_INIT          = 26,
        FUSE_OPENDIR       = 27,
        FUSE_READDIR       = 28,
        FUSE_RELEASEDIR    = 29,
        FUSE_FSYNCDIR      = 30,
        FUSE_GETLK         = 31,
        FUSE_SETLK         = 32,
        FUSE_SETLKW        = 33,
        FUSE_ACCESS        = 34,
        FUSE_CREATE        = 35,
        FUSE_INTERRUPT     = 36,
        FUSE_BMAP          = 37,
        FUSE_DESTROY       = 38,
};

/* The read buffer is required to be at least 8k, but may be much larger */
#define FUSE_MIN_READ_BUFFER 8192

#define FUSE_COMPAT_ENTRY_OUT_SIZE 120

struct fuse_entry_out {
        __u64   nodeid;         /* Inode ID */
        __u64   generation;     /* Inode generation: nodeid:gen must
                                   be unique for the fs's lifetime */
        __u64   entry_valid;    /* Cache timeout for the name */
        __u64   attr_valid;     /* Cache timeout for the attributes */
        __u32   entry_valid_nsec;
        __u32   attr_valid_nsec;
        struct fuse_attr attr;
};

struct fuse_forget_in {
        __u64   nlookup;
};

struct fuse_getattr_in {
        __u32   getattr_flags;
        __u32   dummy;
        __u64   fh;
};

#define FUSE_COMPAT_ATTR_OUT_SIZE 96

struct fuse_attr_out {
        __u64   attr_valid;     /* Cache timeout for the attributes */
        __u32   attr_valid_nsec;
        __u32   dummy;
        struct fuse_attr attr;
};

struct fuse_mknod_in {
        __u32   mode;
        __u32   rdev;
};

struct fuse_mkdir_in {
        __u32   mode;
        __u32   padding;
};

struct fuse_rename_in {
        __u64   newdir;
};

struct fuse_link_in {
        __u64   oldnodeid;
};

struct fuse_setattr_in {
        __u32   valid;
        __u32   padding;
        __u64   fh;
        __u64   size;
        __u64   lock_owner;
        __u64   atime;
        __u64   mtime;
        __u64   unused2;
        __u32   atimensec;
        __u32   mtimensec;
        __u32   unused3;
        __u32   mode;
        __u32   unused4;
        __u32   uid;
        __u32   gid;
        __u32   unused5;
};

struct fuse_open_in {
        __u32   flags;
        __u32   mode;
};

struct fuse_open_out {
        __u64   fh;
        __u32   open_flags;
        __u32   padding;
};

struct fuse_release_in {
        __u64   fh;
        __u32   flags;
        __u32   release_flags;
        __u64   lock_owner;
};

struct fuse_flush_in {
        __u64   fh;
        __u32   unused;
        __u32   padding;
        __u64   lock_owner;
};

struct fuse_read_in {
        __u64   fh;
        __u64   offset;
        __u32   size;
        __u32   read_flags;
        __u64   lock_owner;
        __u32   flags;
        __u32   padding;
};

#define FUSE_COMPAT_WRITE_IN_SIZE 24

struct fuse_write_in {
        __u64   fh;
        __u64   offset;
        __u32   size;
        __u32   write_flags;
        __u64   lock_owner;
        __u32   flags;
        __u32   padding;
};

struct fuse_write_out {
        __u32   size;
        __u32   padding;
};

#define FUSE_COMPAT_STATFS_SIZE 48

struct fuse_statfs_out {
        struct fuse_kstatfs st;
};

struct fuse_fsync_in {
        __u64   fh;
        __u32   fsync_flags;
        __u32   padding;
};

struct fuse_setxattr_in {
        __u32   size;
        __u32   flags;
};

struct fuse_getxattr_in {
        __u32   size;
        __u32   padding;
};

struct fuse_getxattr_out {
        __u32   size;
        __u32   padding;
};

struct fuse_lk_in {
        __u64   fh;
        __u64   owner;
        struct fuse_file_lock lk;
        __u32   lk_flags;
        __u32   padding;
};

struct fuse_lk_out {
        struct fuse_file_lock lk;
};

struct fuse_access_in {
        __u32   mask;
        __u32   padding;
};

struct fuse_init_in {
        __u32   major;
        __u32   minor;
        __u32   max_readahead;
        __u32   flags;
};

struct fuse_init_out {
        __u32   major;
        __u32   minor;
        __u32   max_readahead;
        __u32   flags;
        __u32   unused;
        __u32   max_write;
};

struct fuse_interrupt_in {
        __u64   unique;
};

struct fuse_bmap_in {
        __u64   block;
        __u32   blocksize;
        __u32   padding;
};

struct fuse_bmap_out {
        __u64   block;
};

struct fuse_in_header {
        __u32   len;
        __u32   opcode;
        __u64   unique;
        __u64   nodeid;
        __u32   uid;
        __u32   gid;
        __u32   pid;
        __u32   padding;
};

struct fuse_out_header {
        __u32   len;
        __s32   error;
        __u64   unique;
};

struct fuse_dirent {
        __u64   ino;
        __u64   off;
        __u32   namelen;
        __u32   type;
        char name[0];
};

#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
#define FUSE_DIRENT_SIZE(d) \
        FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)

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