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  *  - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
  18  *  - add blksize field to fuse_attr
  19  *  - add file flags field to fuse_read_in and fuse_write_in
  20  */
  21
  22 #include <asm/types.h>
  23 #include <linux/major.h>
  24
  25 /** Version number of this interface */
  26 #define FUSE_KERNEL_VERSION 7
  27
  28 /** Minor version number of this interface */
  29 #define FUSE_KERNEL_MINOR_VERSION 9
  30
  31 /** The node ID of the root inode */
  32 #define FUSE_ROOT_ID 1
  33
  34 /** The major number of the fuse character device */
  35 #define FUSE_MAJOR MISC_MAJOR
  36
  37 /** The minor number of the fuse character device */
  38 #define FUSE_MINOR 229
  39
  40 /* Make sure all structures are padded to 64bit boundary, so 32bit
  41    userspace works under 64bit kernels */
  42
  43 struct fuse_attr {
  44         __u64   ino;
  45         __u64   size;
  46         __u64   blocks;
  47         __u64   atime;
  48         __u64   mtime;
  49         __u64   ctime;
  50         __u32   atimensec;
  51         __u32   mtimensec;
  52         __u32   ctimensec;
  53         __u32   mode;
  54         __u32   nlink;
  55         __u32   uid;
  56         __u32   gid;
  57         __u32   rdev;
  58         __u32   blksize;
  59         __u32   padding;
  60 };
  61
  62 struct fuse_kstatfs {
  63         __u64   blocks;
  64         __u64   bfree;
  65         __u64   bavail;
  66         __u64   files;
  67         __u64   ffree;
  68         __u32   bsize;
  69         __u32   namelen;
  70         __u32   frsize;
  71         __u32   padding;
  72         __u32   spare[6];
  73 };
  74
  75 struct fuse_file_lock {
  76         __u64   start;
  77         __u64   end;
  78         __u32   type;
  79         __u32   pid; /* tgid */
  80 };
  81
  82 /**
  83  * Bitmasks for fuse_setattr_in.valid
  84  */
  85 #define FATTR_MODE      (1 << 0)
  86 #define FATTR_UID       (1 << 1)
  87 #define FATTR_GID       (1 << 2)
  88 #define FATTR_SIZE      (1 << 3)
  89 #define FATTR_ATIME     (1 << 4)
  90 #define FATTR_MTIME     (1 << 5)
  91 #define FATTR_FH        (1 << 6)
  92 #define FATTR_ATIME_NOW (1 << 7)
  93 #define FATTR_MTIME_NOW (1 << 8)
  94 #define FATTR_LOCKOWNER (1 << 9)
  95
  96 /**
  97  * Flags returned by the OPEN request
  98  *
  99  * FOPEN_DIRECT_IO: bypass page cache for this open file
 100  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 101  */
 102 #define FOPEN_DIRECT_IO         (1 << 0)
 103 #define FOPEN_KEEP_CACHE        (1 << 1)
 104
 105 /**
 106  * INIT request/reply flags
 107  *
 108  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 109  */
 110 #define FUSE_ASYNC_READ         (1 << 0)
 111 #define FUSE_POSIX_LOCKS        (1 << 1)
 112 #define FUSE_FILE_OPS           (1 << 2)
 113 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 114 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 115 #define FUSE_BIG_WRITES         (1 << 5)
 116
 117 /**
 118  * Release flags
 119  */
 120 #define FUSE_RELEASE_FLUSH      (1 << 0)
 121
 122 /**
 123  * Getattr flags
 124  */
 125 #define FUSE_GETATTR_FH         (1 << 0)
 126
 127 /**
 128  * Lock flags
 129  */
 130 #define FUSE_LK_FLOCK           (1 << 0)
 131
 132 /**
 133  * WRITE flags
 134  *
 135  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 136  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 137  */
 138 #define FUSE_WRITE_CACHE        (1 << 0)
 139 #define FUSE_WRITE_LOCKOWNER    (1 << 1)
 140
 141 /**
 142  * Read flags
 143  */
 144 #define FUSE_READ_LOCKOWNER     (1 << 1)
 145
 146 enum fuse_opcode {
 147         FUSE_LOOKUP        = 1,
 148         FUSE_FORGET        = 2,  /* no reply */
 149         FUSE_GETATTR       = 3,
 150         FUSE_SETATTR       = 4,
 151         FUSE_READLINK      = 5,
 152         FUSE_SYMLINK       = 6,
 153         FUSE_MKNOD         = 8,
 154         FUSE_MKDIR         = 9,
 155         FUSE_UNLINK        = 10,
 156         FUSE_RMDIR         = 11,
 157         FUSE_RENAME        = 12,
 158         FUSE_LINK          = 13,
 159         FUSE_OPEN          = 14,
 160         FUSE_READ          = 15,
 161         FUSE_WRITE         = 16,
 162         FUSE_STATFS        = 17,
 163         FUSE_RELEASE       = 18,
 164         FUSE_FSYNC         = 20,
 165         FUSE_SETXATTR      = 21,
 166         FUSE_GETXATTR      = 22,
 167         FUSE_LISTXATTR     = 23,
 168         FUSE_REMOVEXATTR   = 24,
 169         FUSE_FLUSH         = 25,
 170         FUSE_INIT          = 26,
 171         FUSE_OPENDIR       = 27,
 172         FUSE_READDIR       = 28,
 173         FUSE_RELEASEDIR    = 29,
 174         FUSE_FSYNCDIR      = 30,
 175         FUSE_GETLK         = 31,
 176         FUSE_SETLK         = 32,
 177         FUSE_SETLKW        = 33,
 178         FUSE_ACCESS        = 34,
 179         FUSE_CREATE        = 35,
 180         FUSE_INTERRUPT     = 36,
 181         FUSE_BMAP          = 37,
 182         FUSE_DESTROY       = 38,
 183 };
 184
 185 /* The read buffer is required to be at least 8k, but may be much larger */
 186 #define FUSE_MIN_READ_BUFFER 8192
 187
 188 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
 189
 190 struct fuse_entry_out {
 191         __u64   nodeid;         /* Inode ID */
 192         __u64   generation;     /* Inode generation: nodeid:gen must
 193                                    be unique for the fs's lifetime */
 194         __u64   entry_valid;    /* Cache timeout for the name */
 195         __u64   attr_valid;     /* Cache timeout for the attributes */
 196         __u32   entry_valid_nsec;
 197         __u32   attr_valid_nsec;
 198         struct fuse_attr attr;
 199 };
 200
 201 struct fuse_forget_in {
 202         __u64   nlookup;
 203 };
 204
 205 struct fuse_getattr_in {
 206         __u32   getattr_flags;
 207         __u32   dummy;
 208         __u64   fh;
 209 };
 210
 211 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
 212
 213 struct fuse_attr_out {
 214         __u64   attr_valid;     /* Cache timeout for the attributes */
 215         __u32   attr_valid_nsec;
 216         __u32   dummy;
 217         struct fuse_attr attr;
 218 };
 219
 220 struct fuse_mknod_in {
 221         __u32   mode;
 222         __u32   rdev;
 223 };
 224
 225 struct fuse_mkdir_in {
 226         __u32   mode;
 227         __u32   padding;
 228 };
 229
 230 struct fuse_rename_in {
 231         __u64   newdir;
 232 };
 233
 234 struct fuse_link_in {
 235         __u64   oldnodeid;
 236 };
 237
 238 struct fuse_setattr_in {
 239         __u32   valid;
 240         __u32   padding;
 241         __u64   fh;
 242         __u64   size;
 243         __u64   lock_owner;
 244         __u64   atime;
 245         __u64   mtime;
 246         __u64   unused2;
 247         __u32   atimensec;
 248         __u32   mtimensec;
 249         __u32   unused3;
 250         __u32   mode;
 251         __u32   unused4;
 252         __u32   uid;
 253         __u32   gid;
 254         __u32   unused5;
 255 };
 256
 257 struct fuse_open_in {
 258         __u32   flags;
 259         __u32   mode;
 260 };
 261
 262 struct fuse_open_out {
 263         __u64   fh;
 264         __u32   open_flags;
 265         __u32   padding;
 266 };
 267
 268 struct fuse_release_in {
 269         __u64   fh;
 270         __u32   flags;
 271         __u32   release_flags;
 272         __u64   lock_owner;
 273 };
 274
 275 struct fuse_flush_in {
 276         __u64   fh;
 277         __u32   unused;
 278         __u32   padding;
 279         __u64   lock_owner;
 280 };
 281
 282 struct fuse_read_in {
 283         __u64   fh;
 284         __u64   offset;
 285         __u32   size;
 286         __u32   read_flags;
 287         __u64   lock_owner;
 288         __u32   flags;
 289         __u32   padding;
 290 };
 291
 292 #define FUSE_COMPAT_WRITE_IN_SIZE 24
 293
 294 struct fuse_write_in {
 295         __u64   fh;
 296         __u64   offset;
 297         __u32   size;
 298         __u32   write_flags;
 299         __u64   lock_owner;
 300         __u32   flags;
 301         __u32   padding;
 302 };
 303
 304 struct fuse_write_out {
 305         __u32   size;
 306         __u32   padding;
 307 };
 308
 309 #define FUSE_COMPAT_STATFS_SIZE 48
 310
 311 struct fuse_statfs_out {
 312         struct fuse_kstatfs st;
 313 };
 314
 315 struct fuse_fsync_in {
 316         __u64   fh;
 317         __u32   fsync_flags;
 318         __u32   padding;
 319 };
 320
 321 struct fuse_setxattr_in {
 322         __u32   size;
 323         __u32   flags;
 324 };
 325
 326 struct fuse_getxattr_in {
 327         __u32   size;
 328         __u32   padding;
 329 };
 330
 331 struct fuse_getxattr_out {
 332         __u32   size;
 333         __u32   padding;
 334 };
 335
 336 struct fuse_lk_in {
 337         __u64   fh;
 338         __u64   owner;
 339         struct fuse_file_lock lk;
 340         __u32   lk_flags;
 341         __u32   padding;
 342 };
 343
 344 struct fuse_lk_out {
 345         struct fuse_file_lock lk;
 346 };
 347
 348 struct fuse_access_in {
 349         __u32   mask;
 350         __u32   padding;
 351 };
 352
 353 struct fuse_init_in {
 354         __u32   major;
 355         __u32   minor;
 356         __u32   max_readahead;
 357         __u32   flags;
 358 };
 359
 360 struct fuse_init_out {
 361         __u32   major;
 362         __u32   minor;
 363         __u32   max_readahead;
 364         __u32   flags;
 365         __u32   unused;
 366         __u32   max_write;
 367 };
 368
 369 struct fuse_interrupt_in {
 370         __u64   unique;
 371 };
 372
 373 struct fuse_bmap_in {
 374         __u64   block;
 375         __u32   blocksize;
 376         __u32   padding;
 377 };
 378
 379 struct fuse_bmap_out {
 380         __u64   block;
 381 };
 382
 383 struct fuse_in_header {
 384         __u32   len;
 385         __u32   opcode;
 386         __u64   unique;
 387         __u64   nodeid;
 388         __u32   uid;
 389         __u32   gid;
 390         __u32   pid;
 391         __u32   padding;
 392 };
 393
 394 struct fuse_out_header {
 395         __u32   len;
 396         __s32   error;
 397         __u64   unique;
 398 };
 399
 400 struct fuse_dirent {
 401         __u64   ino;
 402         __u64   off;
 403         __u32   namelen;
 404         __u32   type;
 405         char name[0];
 406 };
 407
 408 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 409 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 410 #define FUSE_DIRENT_SIZE(d) \
 411         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)