include/linux/fuse.h

   1 /*
   2     FUSE: Filesystem in Userspace
   3     Copyright (C) 2001-2006  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 /*
  10  * This file defines the kernel interface of FUSE
  11  *
  12  * Protocol changelog:
  13  *
  14  * 7.9:
  15  *  - new fuse_getattr_in input argument of GETATTR
  16  *  - add lk_flags in fuse_lk_in
  17  */
  18
  19 #include <asm/types.h>
  20 #include <linux/major.h>
  21
  22 /** Version number of this interface */
  23 #define FUSE_KERNEL_VERSION 7
  24
  25 /** Minor version number of this interface */
  26 #define FUSE_KERNEL_MINOR_VERSION 9
  27
  28 /** The node ID of the root inode */
  29 #define FUSE_ROOT_ID 1
  30
  31 /** The major number of the fuse character device */
  32 #define FUSE_MAJOR MISC_MAJOR
  33
  34 /** The minor number of the fuse character device */
  35 #define FUSE_MINOR 229
  36
  37 /* Make sure all structures are padded to 64bit boundary, so 32bit
  38    userspace works under 64bit kernels */
  39
  40 struct fuse_attr {
  41         __u64   ino;
  42         __u64   size;
  43         __u64   blocks;
  44         __u64   atime;
  45         __u64   mtime;
  46         __u64   ctime;
  47         __u32   atimensec;
  48         __u32   mtimensec;
  49         __u32   ctimensec;
  50         __u32   mode;
  51         __u32   nlink;
  52         __u32   uid;
  53         __u32   gid;
  54         __u32   rdev;
  55 };
  56
  57 struct fuse_kstatfs {
  58         __u64   blocks;
  59         __u64   bfree;
  60         __u64   bavail;
  61         __u64   files;
  62         __u64   ffree;
  63         __u32   bsize;
  64         __u32   namelen;
  65         __u32   frsize;
  66         __u32   padding;
  67         __u32   spare[6];
  68 };
  69
  70 struct fuse_file_lock {
  71         __u64   start;
  72         __u64   end;
  73         __u32   type;
  74         __u32   pid; /* tgid */
  75 };
  76
  77 /**
  78  * Bitmasks for fuse_setattr_in.valid
  79  */
  80 #define FATTR_MODE      (1 << 0)
  81 #define FATTR_UID       (1 << 1)
  82 #define FATTR_GID       (1 << 2)
  83 #define FATTR_SIZE      (1 << 3)
  84 #define FATTR_ATIME     (1 << 4)
  85 #define FATTR_MTIME     (1 << 5)
  86 #define FATTR_FH        (1 << 6)
  87 #define FATTR_ATIME_NOW (1 << 7)
  88 #define FATTR_MTIME_NOW (1 << 8)
  89
  90 /**
  91  * Flags returned by the OPEN request
  92  *
  93  * FOPEN_DIRECT_IO: bypass page cache for this open file
  94  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
  95  */
  96 #define FOPEN_DIRECT_IO         (1 << 0)
  97 #define FOPEN_KEEP_CACHE        (1 << 1)
  98
  99 /**
 100  * INIT request/reply flags
 101  */
 102 #define FUSE_ASYNC_READ         (1 << 0)
 103 #define FUSE_POSIX_LOCKS        (1 << 1)
 104 #define FUSE_FILE_OPS           (1 << 2)
 105 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 106
 107 /**
 108  * Release flags
 109  */
 110 #define FUSE_RELEASE_FLUSH      (1 << 0)
 111
 112 /**
 113  * Getattr flags
 114  */
 115 #define FUSE_GETATTR_FH         (1 << 0)
 116
 117 /**
 118  * Lock flags
 119  */
 120 #define FUSE_LK_FLOCK           (1 << 0)
 121
 122 enum fuse_opcode {
 123         FUSE_LOOKUP        = 1,
 124         FUSE_FORGET        = 2,  /* no reply */
 125         FUSE_GETATTR       = 3,
 126         FUSE_SETATTR       = 4,
 127         FUSE_READLINK      = 5,
 128         FUSE_SYMLINK       = 6,
 129         FUSE_MKNOD         = 8,
 130         FUSE_MKDIR         = 9,
 131         FUSE_UNLINK        = 10,
 132         FUSE_RMDIR         = 11,
 133         FUSE_RENAME        = 12,
 134         FUSE_LINK          = 13,
 135         FUSE_OPEN          = 14,
 136         FUSE_READ          = 15,
 137         FUSE_WRITE         = 16,
 138         FUSE_STATFS        = 17,
 139         FUSE_RELEASE       = 18,
 140         FUSE_FSYNC         = 20,
 141         FUSE_SETXATTR      = 21,
 142         FUSE_GETXATTR      = 22,
 143         FUSE_LISTXATTR     = 23,
 144         FUSE_REMOVEXATTR   = 24,
 145         FUSE_FLUSH         = 25,
 146         FUSE_INIT          = 26,
 147         FUSE_OPENDIR       = 27,
 148         FUSE_READDIR       = 28,
 149         FUSE_RELEASEDIR    = 29,
 150         FUSE_FSYNCDIR      = 30,
 151         FUSE_GETLK         = 31,
 152         FUSE_SETLK         = 32,
 153         FUSE_SETLKW        = 33,
 154         FUSE_ACCESS        = 34,
 155         FUSE_CREATE        = 35,
 156         FUSE_INTERRUPT     = 36,
 157         FUSE_BMAP          = 37,
 158         FUSE_DESTROY       = 38,
 159 };
 160
 161 /* The read buffer is required to be at least 8k, but may be much larger */
 162 #define FUSE_MIN_READ_BUFFER 8192
 163
 164 struct fuse_entry_out {
 165         __u64   nodeid;         /* Inode ID */
 166         __u64   generation;     /* Inode generation: nodeid:gen must
 167                                    be unique for the fs's lifetime */
 168         __u64   entry_valid;    /* Cache timeout for the name */
 169         __u64   attr_valid;     /* Cache timeout for the attributes */
 170         __u32   entry_valid_nsec;
 171         __u32   attr_valid_nsec;
 172         struct fuse_attr attr;
 173 };
 174
 175 struct fuse_forget_in {
 176         __u64   nlookup;
 177 };
 178
 179 struct fuse_getattr_in {
 180         __u32   getattr_flags;
 181         __u32   dummy;
 182         __u64   fh;
 183 };
 184
 185 struct fuse_attr_out {
 186         __u64   attr_valid;     /* Cache timeout for the attributes */
 187         __u32   attr_valid_nsec;
 188         __u32   dummy;
 189         struct fuse_attr attr;
 190 };
 191
 192 struct fuse_mknod_in {
 193         __u32   mode;
 194         __u32   rdev;
 195 };
 196
 197 struct fuse_mkdir_in {
 198         __u32   mode;
 199         __u32   padding;
 200 };
 201
 202 struct fuse_rename_in {
 203         __u64   newdir;
 204 };
 205
 206 struct fuse_link_in {
 207         __u64   oldnodeid;
 208 };
 209
 210 struct fuse_setattr_in {
 211         __u32   valid;
 212         __u32   padding;
 213         __u64   fh;
 214         __u64   size;
 215         __u64   unused1;
 216         __u64   atime;
 217         __u64   mtime;
 218         __u64   unused2;
 219         __u32   atimensec;
 220         __u32   mtimensec;
 221         __u32   unused3;
 222         __u32   mode;
 223         __u32   unused4;
 224         __u32   uid;
 225         __u32   gid;
 226         __u32   unused5;
 227 };
 228
 229 struct fuse_open_in {
 230         __u32   flags;
 231         __u32   mode;
 232 };
 233
 234 struct fuse_open_out {
 235         __u64   fh;
 236         __u32   open_flags;
 237         __u32   padding;
 238 };
 239
 240 struct fuse_release_in {
 241         __u64   fh;
 242         __u32   flags;
 243         __u32   release_flags;
 244         __u64   lock_owner;
 245 };
 246
 247 struct fuse_flush_in {
 248         __u64   fh;
 249         __u32   unused;
 250         __u32   padding;
 251         __u64   lock_owner;
 252 };
 253
 254 struct fuse_read_in {
 255         __u64   fh;
 256         __u64   offset;
 257         __u32   size;
 258         __u32   padding;
 259 };
 260
 261 struct fuse_write_in {
 262         __u64   fh;
 263         __u64   offset;
 264         __u32   size;
 265         __u32   write_flags;
 266 };
 267
 268 struct fuse_write_out {
 269         __u32   size;
 270         __u32   padding;
 271 };
 272
 273 #define FUSE_COMPAT_STATFS_SIZE 48
 274
 275 struct fuse_statfs_out {
 276         struct fuse_kstatfs st;
 277 };
 278
 279 struct fuse_fsync_in {
 280         __u64   fh;
 281         __u32   fsync_flags;
 282         __u32   padding;
 283 };
 284
 285 struct fuse_setxattr_in {
 286         __u32   size;
 287         __u32   flags;
 288 };
 289
 290 struct fuse_getxattr_in {
 291         __u32   size;
 292         __u32   padding;
 293 };
 294
 295 struct fuse_getxattr_out {
 296         __u32   size;
 297         __u32   padding;
 298 };
 299
 300 struct fuse_lk_in {
 301         __u64   fh;
 302         __u64   owner;
 303         struct fuse_file_lock lk;
 304         __u32   lk_flags;
 305         __u32   padding;
 306 };
 307
 308 struct fuse_lk_out {
 309         struct fuse_file_lock lk;
 310 };
 311
 312 struct fuse_access_in {
 313         __u32   mask;
 314         __u32   padding;
 315 };
 316
 317 struct fuse_init_in {
 318         __u32   major;
 319         __u32   minor;
 320         __u32   max_readahead;
 321         __u32   flags;
 322 };
 323
 324 struct fuse_init_out {
 325         __u32   major;
 326         __u32   minor;
 327         __u32   max_readahead;
 328         __u32   flags;
 329         __u32   unused;
 330         __u32   max_write;
 331 };
 332
 333 struct fuse_interrupt_in {
 334         __u64   unique;
 335 };
 336
 337 struct fuse_bmap_in {
 338         __u64   block;
 339         __u32   blocksize;
 340         __u32   padding;
 341 };
 342
 343 struct fuse_bmap_out {
 344         __u64   block;
 345 };
 346
 347 struct fuse_in_header {
 348         __u32   len;
 349         __u32   opcode;
 350         __u64   unique;
 351         __u64   nodeid;
 352         __u32   uid;
 353         __u32   gid;
 354         __u32   pid;
 355         __u32   padding;
 356 };
 357
 358 struct fuse_out_header {
 359         __u32   len;
 360         __s32   error;
 361         __u64   unique;
 362 };
 363
 364 struct fuse_dirent {
 365         __u64   ino;
 366         __u64   off;
 367         __u32   namelen;
 368         __u32   type;
 369         char name[0];
 370 };
 371
 372 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 373 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 374 #define FUSE_DIRENT_SIZE(d) \
 375         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)