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  * 7.10
  22  *  - add nonseekable open flag
  23  */
  24
  25 #ifndef _LINUX_FUSE_H
  26 #define _LINUX_FUSE_H
  27
  28 #include <asm/types.h>
  29 #include <linux/major.h>
  30
  31 /** Version number of this interface */
  32 #define FUSE_KERNEL_VERSION 7
  33
  34 /** Minor version number of this interface */
  35 #define FUSE_KERNEL_MINOR_VERSION 10
  36
  37 /** The node ID of the root inode */
  38 #define FUSE_ROOT_ID 1
  39
  40 /** The major number of the fuse character device */
  41 #define FUSE_MAJOR MISC_MAJOR
  42
  43 /** The minor number of the fuse character device */
  44 #define FUSE_MINOR 229
  45
  46 /* Make sure all structures are padded to 64bit boundary, so 32bit
  47    userspace works under 64bit kernels */
  48
  49 struct fuse_attr {
  50         __u64   ino;
  51         __u64   size;
  52         __u64   blocks;
  53         __u64   atime;
  54         __u64   mtime;
  55         __u64   ctime;
  56         __u32   atimensec;
  57         __u32   mtimensec;
  58         __u32   ctimensec;
  59         __u32   mode;
  60         __u32   nlink;
  61         __u32   uid;
  62         __u32   gid;
  63         __u32   rdev;
  64         __u32   blksize;
  65         __u32   padding;
  66 };
  67
  68 struct fuse_kstatfs {
  69         __u64   blocks;
  70         __u64   bfree;
  71         __u64   bavail;
  72         __u64   files;
  73         __u64   ffree;
  74         __u32   bsize;
  75         __u32   namelen;
  76         __u32   frsize;
  77         __u32   padding;
  78         __u32   spare[6];
  79 };
  80
  81 struct fuse_file_lock {
  82         __u64   start;
  83         __u64   end;
  84         __u32   type;
  85         __u32   pid; /* tgid */
  86 };
  87
  88 /**
  89  * Bitmasks for fuse_setattr_in.valid
  90  */
  91 #define FATTR_MODE      (1 << 0)
  92 #define FATTR_UID       (1 << 1)
  93 #define FATTR_GID       (1 << 2)
  94 #define FATTR_SIZE      (1 << 3)
  95 #define FATTR_ATIME     (1 << 4)
  96 #define FATTR_MTIME     (1 << 5)
  97 #define FATTR_FH        (1 << 6)
  98 #define FATTR_ATIME_NOW (1 << 7)
  99 #define FATTR_MTIME_NOW (1 << 8)
 100 #define FATTR_LOCKOWNER (1 << 9)
 101
 102 /**
 103  * Flags returned by the OPEN request
 104  *
 105  * FOPEN_DIRECT_IO: bypass page cache for this open file
 106  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 107  * FOPEN_NONSEEKABLE: the file is not seekable
 108  */
 109 #define FOPEN_DIRECT_IO         (1 << 0)
 110 #define FOPEN_KEEP_CACHE        (1 << 1)
 111 #define FOPEN_NONSEEKABLE       (1 << 2)
 112
 113 /**
 114  * INIT request/reply flags
 115  *
 116  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 117  */
 118 #define FUSE_ASYNC_READ         (1 << 0)
 119 #define FUSE_POSIX_LOCKS        (1 << 1)
 120 #define FUSE_FILE_OPS           (1 << 2)
 121 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 122 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 123 #define FUSE_BIG_WRITES         (1 << 5)
 124
 125 /**
 126  * Release flags
 127  */
 128 #define FUSE_RELEASE_FLUSH      (1 << 0)
 129
 130 /**
 131  * Getattr flags
 132  */
 133 #define FUSE_GETATTR_FH         (1 << 0)
 134
 135 /**
 136  * Lock flags
 137  */
 138 #define FUSE_LK_FLOCK           (1 << 0)
 139
 140 /**
 141  * WRITE flags
 142  *
 143  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 144  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 145  */
 146 #define FUSE_WRITE_CACHE        (1 << 0)
 147 #define FUSE_WRITE_LOCKOWNER    (1 << 1)
 148
 149 /**
 150  * Read flags
 151  */
 152 #define FUSE_READ_LOCKOWNER     (1 << 1)
 153
 154 enum fuse_opcode {
 155         FUSE_LOOKUP        = 1,
 156         FUSE_FORGET        = 2,  /* no reply */
 157         FUSE_GETATTR       = 3,
 158         FUSE_SETATTR       = 4,
 159         FUSE_READLINK      = 5,
 160         FUSE_SYMLINK       = 6,
 161         FUSE_MKNOD         = 8,
 162         FUSE_MKDIR         = 9,
 163         FUSE_UNLINK        = 10,
 164         FUSE_RMDIR         = 11,
 165         FUSE_RENAME        = 12,
 166         FUSE_LINK          = 13,
 167         FUSE_OPEN          = 14,
 168         FUSE_READ          = 15,
 169         FUSE_WRITE         = 16,
 170         FUSE_STATFS        = 17,
 171         FUSE_RELEASE       = 18,
 172         FUSE_FSYNC         = 20,
 173         FUSE_SETXATTR      = 21,
 174         FUSE_GETXATTR      = 22,
 175         FUSE_LISTXATTR     = 23,
 176         FUSE_REMOVEXATTR   = 24,
 177         FUSE_FLUSH         = 25,
 178         FUSE_INIT          = 26,
 179         FUSE_OPENDIR       = 27,
 180         FUSE_READDIR       = 28,
 181         FUSE_RELEASEDIR    = 29,
 182         FUSE_FSYNCDIR      = 30,
 183         FUSE_GETLK         = 31,
 184         FUSE_SETLK         = 32,
 185         FUSE_SETLKW        = 33,
 186         FUSE_ACCESS        = 34,
 187         FUSE_CREATE        = 35,
 188         FUSE_INTERRUPT     = 36,
 189         FUSE_BMAP          = 37,
 190         FUSE_DESTROY       = 38,
 191 };
 192
 193 /* The read buffer is required to be at least 8k, but may be much larger */
 194 #define FUSE_MIN_READ_BUFFER 8192
 195
 196 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
 197
 198 struct fuse_entry_out {
 199         __u64   nodeid;         /* Inode ID */
 200         __u64   generation;     /* Inode generation: nodeid:gen must
 201                                    be unique for the fs's lifetime */
 202         __u64   entry_valid;    /* Cache timeout for the name */
 203         __u64   attr_valid;     /* Cache timeout for the attributes */
 204         __u32   entry_valid_nsec;
 205         __u32   attr_valid_nsec;
 206         struct fuse_attr attr;
 207 };
 208
 209 struct fuse_forget_in {
 210         __u64   nlookup;
 211 };
 212
 213 struct fuse_getattr_in {
 214         __u32   getattr_flags;
 215         __u32   dummy;
 216         __u64   fh;
 217 };
 218
 219 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
 220
 221 struct fuse_attr_out {
 222         __u64   attr_valid;     /* Cache timeout for the attributes */
 223         __u32   attr_valid_nsec;
 224         __u32   dummy;
 225         struct fuse_attr attr;
 226 };
 227
 228 struct fuse_mknod_in {
 229         __u32   mode;
 230         __u32   rdev;
 231 };
 232
 233 struct fuse_mkdir_in {
 234         __u32   mode;
 235         __u32   padding;
 236 };
 237
 238 struct fuse_rename_in {
 239         __u64   newdir;
 240 };
 241
 242 struct fuse_link_in {
 243         __u64   oldnodeid;
 244 };
 245
 246 struct fuse_setattr_in {
 247         __u32   valid;
 248         __u32   padding;
 249         __u64   fh;
 250         __u64   size;
 251         __u64   lock_owner;
 252         __u64   atime;
 253         __u64   mtime;
 254         __u64   unused2;
 255         __u32   atimensec;
 256         __u32   mtimensec;
 257         __u32   unused3;
 258         __u32   mode;
 259         __u32   unused4;
 260         __u32   uid;
 261         __u32   gid;
 262         __u32   unused5;
 263 };
 264
 265 struct fuse_open_in {
 266         __u32   flags;
 267         __u32   mode;
 268 };
 269
 270 struct fuse_open_out {
 271         __u64   fh;
 272         __u32   open_flags;
 273         __u32   padding;
 274 };
 275
 276 struct fuse_release_in {
 277         __u64   fh;
 278         __u32   flags;
 279         __u32   release_flags;
 280         __u64   lock_owner;
 281 };
 282
 283 struct fuse_flush_in {
 284         __u64   fh;
 285         __u32   unused;
 286         __u32   padding;
 287         __u64   lock_owner;
 288 };
 289
 290 struct fuse_read_in {
 291         __u64   fh;
 292         __u64   offset;
 293         __u32   size;
 294         __u32   read_flags;
 295         __u64   lock_owner;
 296         __u32   flags;
 297         __u32   padding;
 298 };
 299
 300 #define FUSE_COMPAT_WRITE_IN_SIZE 24
 301
 302 struct fuse_write_in {
 303         __u64   fh;
 304         __u64   offset;
 305         __u32   size;
 306         __u32   write_flags;
 307         __u64   lock_owner;
 308         __u32   flags;
 309         __u32   padding;
 310 };
 311
 312 struct fuse_write_out {
 313         __u32   size;
 314         __u32   padding;
 315 };
 316
 317 #define FUSE_COMPAT_STATFS_SIZE 48
 318
 319 struct fuse_statfs_out {
 320         struct fuse_kstatfs st;
 321 };
 322
 323 struct fuse_fsync_in {
 324         __u64   fh;
 325         __u32   fsync_flags;
 326         __u32   padding;
 327 };
 328
 329 struct fuse_setxattr_in {
 330         __u32   size;
 331         __u32   flags;
 332 };
 333
 334 struct fuse_getxattr_in {
 335         __u32   size;
 336         __u32   padding;
 337 };
 338
 339 struct fuse_getxattr_out {
 340         __u32   size;
 341         __u32   padding;
 342 };
 343
 344 struct fuse_lk_in {
 345         __u64   fh;
 346         __u64   owner;
 347         struct fuse_file_lock lk;
 348         __u32   lk_flags;
 349         __u32   padding;
 350 };
 351
 352 struct fuse_lk_out {
 353         struct fuse_file_lock lk;
 354 };
 355
 356 struct fuse_access_in {
 357         __u32   mask;
 358         __u32   padding;
 359 };
 360
 361 struct fuse_init_in {
 362         __u32   major;
 363         __u32   minor;
 364         __u32   max_readahead;
 365         __u32   flags;
 366 };
 367
 368 struct fuse_init_out {
 369         __u32   major;
 370         __u32   minor;
 371         __u32   max_readahead;
 372         __u32   flags;
 373         __u32   unused;
 374         __u32   max_write;
 375 };
 376
 377 struct fuse_interrupt_in {
 378         __u64   unique;
 379 };
 380
 381 struct fuse_bmap_in {
 382         __u64   block;
 383         __u32   blocksize;
 384         __u32   padding;
 385 };
 386
 387 struct fuse_bmap_out {
 388         __u64   block;
 389 };
 390
 391 struct fuse_in_header {
 392         __u32   len;
 393         __u32   opcode;
 394         __u64   unique;
 395         __u64   nodeid;
 396         __u32   uid;
 397         __u32   gid;
 398         __u32   pid;
 399         __u32   padding;
 400 };
 401
 402 struct fuse_out_header {
 403         __u32   len;
 404         __s32   error;
 405         __u64   unique;
 406 };
 407
 408 struct fuse_dirent {
 409         __u64   ino;
 410         __u64   off;
 411         __u32   namelen;
 412         __u32   type;
 413         char name[0];
 414 };
 415
 416 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 417 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 418 #define FUSE_DIRENT_SIZE(d) \
 419         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
 420
 421 #endif /* _LINUX_FUSE_H */