include/linux/fuse.h

   1 /*
   2     FUSE: Filesystem in Userspace
   3     Copyright (C) 2001-2005  Miklos Szeredi <miklos@szeredi.hu>
   4
   5     This program can be distributed under the terms of the GNU GPL.
   6     See the file COPYING.
   7 */
   8
   9 /* This file defines the kernel interface of FUSE */
  10
  11 #include <asm/types.h>
  12
  13 /** Version number of this interface */
  14 #define FUSE_KERNEL_VERSION 7
  15
  16 /** Minor version number of this interface */
  17 #define FUSE_KERNEL_MINOR_VERSION 2
  18
  19 /** The node ID of the root inode */
  20 #define FUSE_ROOT_ID 1
  21
  22 /** The major number of the fuse character device */
  23 #define FUSE_MAJOR 10
  24
  25 /** The minor number of the fuse character device */
  26 #define FUSE_MINOR 229
  27
  28 /* Make sure all structures are padded to 64bit boundary, so 32bit
  29    userspace works under 64bit kernels */
  30
  31 struct fuse_attr {
  32         __u64   ino;
  33         __u64   size;
  34         __u64   blocks;
  35         __u64   atime;
  36         __u64   mtime;
  37         __u64   ctime;
  38         __u32   atimensec;
  39         __u32   mtimensec;
  40         __u32   ctimensec;
  41         __u32   mode;
  42         __u32   nlink;
  43         __u32   uid;
  44         __u32   gid;
  45         __u32   rdev;
  46 };
  47
  48 struct fuse_kstatfs {
  49         __u64   blocks;
  50         __u64   bfree;
  51         __u64   bavail;
  52         __u64   files;
  53         __u64   ffree;
  54         __u32   bsize;
  55         __u32   namelen;
  56 };
  57
  58 #define FATTR_MODE      (1 << 0)
  59 #define FATTR_UID       (1 << 1)
  60 #define FATTR_GID       (1 << 2)
  61 #define FATTR_SIZE      (1 << 3)
  62 #define FATTR_ATIME     (1 << 4)
  63 #define FATTR_MTIME     (1 << 5)
  64 #define FATTR_CTIME     (1 << 6)
  65
  66 /**
  67  * Flags returned by the OPEN request
  68  *
  69  * FOPEN_DIRECT_IO: bypass page cache for this open file
  70  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
  71  */
  72 #define FOPEN_DIRECT_IO         (1 << 0)
  73 #define FOPEN_KEEP_CACHE        (1 << 1)
  74
  75 enum fuse_opcode {
  76         FUSE_LOOKUP        = 1,
  77         FUSE_FORGET        = 2,  /* no reply */
  78         FUSE_GETATTR       = 3,
  79         FUSE_SETATTR       = 4,
  80         FUSE_READLINK      = 5,
  81         FUSE_SYMLINK       = 6,
  82         FUSE_MKNOD         = 8,
  83         FUSE_MKDIR         = 9,
  84         FUSE_UNLINK        = 10,
  85         FUSE_RMDIR         = 11,
  86         FUSE_RENAME        = 12,
  87         FUSE_LINK          = 13,
  88         FUSE_OPEN          = 14,
  89         FUSE_READ          = 15,
  90         FUSE_WRITE         = 16,
  91         FUSE_STATFS        = 17,
  92         FUSE_RELEASE       = 18,
  93         FUSE_FSYNC         = 20,
  94         FUSE_SETXATTR      = 21,
  95         FUSE_GETXATTR      = 22,
  96         FUSE_LISTXATTR     = 23,
  97         FUSE_REMOVEXATTR   = 24,
  98         FUSE_FLUSH         = 25,
  99         FUSE_INIT          = 26,
 100         FUSE_OPENDIR       = 27,
 101         FUSE_READDIR       = 28,
 102         FUSE_RELEASEDIR    = 29,
 103         FUSE_FSYNCDIR      = 30
 104 };
 105
 106 /* Conservative buffer size for the client */
 107 #define FUSE_MAX_IN 8192
 108
 109 #define FUSE_NAME_MAX 1024
 110 #define FUSE_SYMLINK_MAX 4096
 111 #define FUSE_XATTR_SIZE_MAX 4096
 112
 113 struct fuse_entry_out {
 114         __u64   nodeid;         /* Inode ID */
 115         __u64   generation;     /* Inode generation: nodeid:gen must
 116                                    be unique for the fs's lifetime */
 117         __u64   entry_valid;    /* Cache timeout for the name */
 118         __u64   attr_valid;     /* Cache timeout for the attributes */
 119         __u32   entry_valid_nsec;
 120         __u32   attr_valid_nsec;
 121         struct fuse_attr attr;
 122 };
 123
 124 struct fuse_forget_in {
 125         __u64   nlookup;
 126 };
 127
 128 struct fuse_attr_out {
 129         __u64   attr_valid;     /* Cache timeout for the attributes */
 130         __u32   attr_valid_nsec;
 131         __u32   dummy;
 132         struct fuse_attr attr;
 133 };
 134
 135 struct fuse_mknod_in {
 136         __u32   mode;
 137         __u32   rdev;
 138 };
 139
 140 struct fuse_mkdir_in {
 141         __u32   mode;
 142         __u32   padding;
 143 };
 144
 145 struct fuse_rename_in {
 146         __u64   newdir;
 147 };
 148
 149 struct fuse_link_in {
 150         __u64   oldnodeid;
 151 };
 152
 153 struct fuse_setattr_in {
 154         __u32   valid;
 155         __u32   padding;
 156         struct fuse_attr attr;
 157 };
 158
 159 struct fuse_open_in {
 160         __u32   flags;
 161         __u32   padding;
 162 };
 163
 164 struct fuse_open_out {
 165         __u64   fh;
 166         __u32   open_flags;
 167         __u32   padding;
 168 };
 169
 170 struct fuse_release_in {
 171         __u64   fh;
 172         __u32   flags;
 173         __u32   padding;
 174 };
 175
 176 struct fuse_flush_in {
 177         __u64   fh;
 178         __u32   flush_flags;
 179         __u32   padding;
 180 };
 181
 182 struct fuse_read_in {
 183         __u64   fh;
 184         __u64   offset;
 185         __u32   size;
 186         __u32   padding;
 187 };
 188
 189 struct fuse_write_in {
 190         __u64   fh;
 191         __u64   offset;
 192         __u32   size;
 193         __u32   write_flags;
 194 };
 195
 196 struct fuse_write_out {
 197         __u32   size;
 198         __u32   padding;
 199 };
 200
 201 struct fuse_statfs_out {
 202         struct fuse_kstatfs st;
 203 };
 204
 205 struct fuse_fsync_in {
 206         __u64   fh;
 207         __u32   fsync_flags;
 208         __u32   padding;
 209 };
 210
 211 struct fuse_setxattr_in {
 212         __u32   size;
 213         __u32   flags;
 214 };
 215
 216 struct fuse_getxattr_in {
 217         __u32   size;
 218         __u32   padding;
 219 };
 220
 221 struct fuse_getxattr_out {
 222         __u32   size;
 223         __u32   padding;
 224 };
 225
 226 struct fuse_init_in_out {
 227         __u32   major;
 228         __u32   minor;
 229 };
 230
 231 struct fuse_in_header {
 232         __u32   len;
 233         __u32   opcode;
 234         __u64   unique;
 235         __u64   nodeid;
 236         __u32   uid;
 237         __u32   gid;
 238         __u32   pid;
 239         __u32   padding;
 240 };
 241
 242 struct fuse_out_header {
 243         __u32   len;
 244         __s32   error;
 245         __u64   unique;
 246 };
 247
 248 struct fuse_dirent {
 249         __u64   ino;
 250         __u64   off;
 251         __u32   namelen;
 252         __u32   type;
 253         char name[0];
 254 };
 255
 256 #define FUSE_NAME_OFFSET ((unsigned) ((struct fuse_dirent *) 0)->name)
 257 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 258 #define FUSE_DIRENT_SIZE(d) \
 259         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)