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