include/linux/fuse.h

   1 /*
   2     FUSE: Filesystem in Userspace
   3     Copyright (C) 2001-2008  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  * 7.11
  25  *  - add IOCTL message
  26  *  - add unsolicited notification support
  27  *  - add POLL message and NOTIFY_POLL notification
  28  *
  29  * 7.12
  30  *  - add umask flag to input argument of open, mknod and mkdir
  31  *  - add notification messages for invalidation of inodes and
  32  *    directory entries
  33  */
  34
  35 #ifndef _LINUX_FUSE_H
  36 #define _LINUX_FUSE_H
  37
  38 #include <linux/types.h>
  39
  40 /** Version number of this interface */
  41 #define FUSE_KERNEL_VERSION 7
  42
  43 /** Minor version number of this interface */
  44 #define FUSE_KERNEL_MINOR_VERSION 12
  45
  46 /** The node ID of the root inode */
  47 #define FUSE_ROOT_ID 1
  48
  49 /* Make sure all structures are padded to 64bit boundary, so 32bit
  50    userspace works under 64bit kernels */
  51
  52 struct fuse_attr {
  53         __u64   ino;
  54         __u64   size;
  55         __u64   blocks;
  56         __u64   atime;
  57         __u64   mtime;
  58         __u64   ctime;
  59         __u32   atimensec;
  60         __u32   mtimensec;
  61         __u32   ctimensec;
  62         __u32   mode;
  63         __u32   nlink;
  64         __u32   uid;
  65         __u32   gid;
  66         __u32   rdev;
  67         __u32   blksize;
  68         __u32   padding;
  69 };
  70
  71 struct fuse_kstatfs {
  72         __u64   blocks;
  73         __u64   bfree;
  74         __u64   bavail;
  75         __u64   files;
  76         __u64   ffree;
  77         __u32   bsize;
  78         __u32   namelen;
  79         __u32   frsize;
  80         __u32   padding;
  81         __u32   spare[6];
  82 };
  83
  84 struct fuse_file_lock {
  85         __u64   start;
  86         __u64   end;
  87         __u32   type;
  88         __u32   pid; /* tgid */
  89 };
  90
  91 /**
  92  * Bitmasks for fuse_setattr_in.valid
  93  */
  94 #define FATTR_MODE      (1 << 0)
  95 #define FATTR_UID       (1 << 1)
  96 #define FATTR_GID       (1 << 2)
  97 #define FATTR_SIZE      (1 << 3)
  98 #define FATTR_ATIME     (1 << 4)
  99 #define FATTR_MTIME     (1 << 5)
 100 #define FATTR_FH        (1 << 6)
 101 #define FATTR_ATIME_NOW (1 << 7)
 102 #define FATTR_MTIME_NOW (1 << 8)
 103 #define FATTR_LOCKOWNER (1 << 9)
 104
 105 /**
 106  * Flags returned by the OPEN request
 107  *
 108  * FOPEN_DIRECT_IO: bypass page cache for this open file
 109  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 110  * FOPEN_NONSEEKABLE: the file is not seekable
 111  */
 112 #define FOPEN_DIRECT_IO         (1 << 0)
 113 #define FOPEN_KEEP_CACHE        (1 << 1)
 114 #define FOPEN_NONSEEKABLE       (1 << 2)
 115
 116 /**
 117  * INIT request/reply flags
 118  *
 119  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 120  * FUSE_DONT_MASK: don't apply umask to file mode on create operations
 121  */
 122 #define FUSE_ASYNC_READ         (1 << 0)
 123 #define FUSE_POSIX_LOCKS        (1 << 1)
 124 #define FUSE_FILE_OPS           (1 << 2)
 125 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 126 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 127 #define FUSE_BIG_WRITES         (1 << 5)
 128 #define FUSE_DONT_MASK          (1 << 6)
 129
 130 /**
 131  * CUSE INIT request/reply flags
 132  *
 133  * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
 134  */
 135 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
 136
 137 /**
 138  * Release flags
 139  */
 140 #define FUSE_RELEASE_FLUSH      (1 << 0)
 141
 142 /**
 143  * Getattr flags
 144  */
 145 #define FUSE_GETATTR_FH         (1 << 0)
 146
 147 /**
 148  * Lock flags
 149  */
 150 #define FUSE_LK_FLOCK           (1 << 0)
 151
 152 /**
 153  * WRITE flags
 154  *
 155  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 156  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 157  */
 158 #define FUSE_WRITE_CACHE        (1 << 0)
 159 #define FUSE_WRITE_LOCKOWNER    (1 << 1)
 160
 161 /**
 162  * Read flags
 163  */
 164 #define FUSE_READ_LOCKOWNER     (1 << 1)
 165
 166 /**
 167  * Ioctl flags
 168  *
 169  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
 170  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
 171  * FUSE_IOCTL_RETRY: retry with new iovecs
 172  *
 173  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
 174  */
 175 #define FUSE_IOCTL_COMPAT       (1 << 0)
 176 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
 177 #define FUSE_IOCTL_RETRY        (1 << 2)
 178
 179 #define FUSE_IOCTL_MAX_IOV      256
 180
 181 /**
 182  * Poll flags
 183  *
 184  * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
 185  */
 186 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
 187
 188 enum fuse_opcode {
 189         FUSE_LOOKUP        = 1,
 190         FUSE_FORGET        = 2,  /* no reply */
 191         FUSE_GETATTR       = 3,
 192         FUSE_SETATTR       = 4,
 193         FUSE_READLINK      = 5,
 194         FUSE_SYMLINK       = 6,
 195         FUSE_MKNOD         = 8,
 196         FUSE_MKDIR         = 9,
 197         FUSE_UNLINK        = 10,
 198         FUSE_RMDIR         = 11,
 199         FUSE_RENAME        = 12,
 200         FUSE_LINK          = 13,
 201         FUSE_OPEN          = 14,
 202         FUSE_READ          = 15,
 203         FUSE_WRITE         = 16,
 204         FUSE_STATFS        = 17,
 205         FUSE_RELEASE       = 18,
 206         FUSE_FSYNC         = 20,
 207         FUSE_SETXATTR      = 21,
 208         FUSE_GETXATTR      = 22,
 209         FUSE_LISTXATTR     = 23,
 210         FUSE_REMOVEXATTR   = 24,
 211         FUSE_FLUSH         = 25,
 212         FUSE_INIT          = 26,
 213         FUSE_OPENDIR       = 27,
 214         FUSE_READDIR       = 28,
 215         FUSE_RELEASEDIR    = 29,
 216         FUSE_FSYNCDIR      = 30,
 217         FUSE_GETLK         = 31,
 218         FUSE_SETLK         = 32,
 219         FUSE_SETLKW        = 33,
 220         FUSE_ACCESS        = 34,
 221         FUSE_CREATE        = 35,
 222         FUSE_INTERRUPT     = 36,
 223         FUSE_BMAP          = 37,
 224         FUSE_DESTROY       = 38,
 225         FUSE_IOCTL         = 39,
 226         FUSE_POLL          = 40,
 227
 228         /* CUSE specific operations */
 229         CUSE_INIT          = 4096,
 230 };
 231
 232 enum fuse_notify_code {
 233         FUSE_NOTIFY_POLL   = 1,
 234         FUSE_NOTIFY_INVAL_INODE = 2,
 235         FUSE_NOTIFY_INVAL_ENTRY = 3,
 236         FUSE_NOTIFY_CODE_MAX,
 237 };
 238
 239 /* The read buffer is required to be at least 8k, but may be much larger */
 240 #define FUSE_MIN_READ_BUFFER 8192
 241
 242 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
 243
 244 struct fuse_entry_out {
 245         __u64   nodeid;         /* Inode ID */
 246         __u64   generation;     /* Inode generation: nodeid:gen must
 247                                    be unique for the fs's lifetime */
 248         __u64   entry_valid;    /* Cache timeout for the name */
 249         __u64   attr_valid;     /* Cache timeout for the attributes */
 250         __u32   entry_valid_nsec;
 251         __u32   attr_valid_nsec;
 252         struct fuse_attr attr;
 253 };
 254
 255 struct fuse_forget_in {
 256         __u64   nlookup;
 257 };
 258
 259 struct fuse_getattr_in {
 260         __u32   getattr_flags;
 261         __u32   dummy;
 262         __u64   fh;
 263 };
 264
 265 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
 266
 267 struct fuse_attr_out {
 268         __u64   attr_valid;     /* Cache timeout for the attributes */
 269         __u32   attr_valid_nsec;
 270         __u32   dummy;
 271         struct fuse_attr attr;
 272 };
 273
 274 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
 275
 276 struct fuse_mknod_in {
 277         __u32   mode;
 278         __u32   rdev;
 279         __u32   umask;
 280         __u32   padding;
 281 };
 282
 283 struct fuse_mkdir_in {
 284         __u32   mode;
 285         __u32   umask;
 286 };
 287
 288 struct fuse_rename_in {
 289         __u64   newdir;
 290 };
 291
 292 struct fuse_link_in {
 293         __u64   oldnodeid;
 294 };
 295
 296 struct fuse_setattr_in {
 297         __u32   valid;
 298         __u32   padding;
 299         __u64   fh;
 300         __u64   size;
 301         __u64   lock_owner;
 302         __u64   atime;
 303         __u64   mtime;
 304         __u64   unused2;
 305         __u32   atimensec;
 306         __u32   mtimensec;
 307         __u32   unused3;
 308         __u32   mode;
 309         __u32   unused4;
 310         __u32   uid;
 311         __u32   gid;
 312         __u32   unused5;
 313 };
 314
 315 struct fuse_open_in {
 316         __u32   flags;
 317         __u32   unused;
 318 };
 319
 320 struct fuse_create_in {
 321         __u32   flags;
 322         __u32   mode;
 323         __u32   umask;
 324         __u32   padding;
 325 };
 326
 327 struct fuse_open_out {
 328         __u64   fh;
 329         __u32   open_flags;
 330         __u32   padding;
 331 };
 332
 333 struct fuse_release_in {
 334         __u64   fh;
 335         __u32   flags;
 336         __u32   release_flags;
 337         __u64   lock_owner;
 338 };
 339
 340 struct fuse_flush_in {
 341         __u64   fh;
 342         __u32   unused;
 343         __u32   padding;
 344         __u64   lock_owner;
 345 };
 346
 347 struct fuse_read_in {
 348         __u64   fh;
 349         __u64   offset;
 350         __u32   size;
 351         __u32   read_flags;
 352         __u64   lock_owner;
 353         __u32   flags;
 354         __u32   padding;
 355 };
 356
 357 #define FUSE_COMPAT_WRITE_IN_SIZE 24
 358
 359 struct fuse_write_in {
 360         __u64   fh;
 361         __u64   offset;
 362         __u32   size;
 363         __u32   write_flags;
 364         __u64   lock_owner;
 365         __u32   flags;
 366         __u32   padding;
 367 };
 368
 369 struct fuse_write_out {
 370         __u32   size;
 371         __u32   padding;
 372 };
 373
 374 #define FUSE_COMPAT_STATFS_SIZE 48
 375
 376 struct fuse_statfs_out {
 377         struct fuse_kstatfs st;
 378 };
 379
 380 struct fuse_fsync_in {
 381         __u64   fh;
 382         __u32   fsync_flags;
 383         __u32   padding;
 384 };
 385
 386 struct fuse_setxattr_in {
 387         __u32   size;
 388         __u32   flags;
 389 };
 390
 391 struct fuse_getxattr_in {
 392         __u32   size;
 393         __u32   padding;
 394 };
 395
 396 struct fuse_getxattr_out {
 397         __u32   size;
 398         __u32   padding;
 399 };
 400
 401 struct fuse_lk_in {
 402         __u64   fh;
 403         __u64   owner;
 404         struct fuse_file_lock lk;
 405         __u32   lk_flags;
 406         __u32   padding;
 407 };
 408
 409 struct fuse_lk_out {
 410         struct fuse_file_lock lk;
 411 };
 412
 413 struct fuse_access_in {
 414         __u32   mask;
 415         __u32   padding;
 416 };
 417
 418 struct fuse_init_in {
 419         __u32   major;
 420         __u32   minor;
 421         __u32   max_readahead;
 422         __u32   flags;
 423 };
 424
 425 struct fuse_init_out {
 426         __u32   major;
 427         __u32   minor;
 428         __u32   max_readahead;
 429         __u32   flags;
 430         __u32   unused;
 431         __u32   max_write;
 432 };
 433
 434 #define CUSE_INIT_INFO_MAX 4096
 435
 436 struct cuse_init_in {
 437         __u32   major;
 438         __u32   minor;
 439         __u32   unused;
 440         __u32   flags;
 441 };
 442
 443 struct cuse_init_out {
 444         __u32   major;
 445         __u32   minor;
 446         __u32   unused;
 447         __u32   flags;
 448         __u32   max_read;
 449         __u32   max_write;
 450         __u32   dev_major;              /* chardev major */
 451         __u32   dev_minor;              /* chardev minor */
 452         __u32   spare[10];
 453 };
 454
 455 struct fuse_interrupt_in {
 456         __u64   unique;
 457 };
 458
 459 struct fuse_bmap_in {
 460         __u64   block;
 461         __u32   blocksize;
 462         __u32   padding;
 463 };
 464
 465 struct fuse_bmap_out {
 466         __u64   block;
 467 };
 468
 469 struct fuse_ioctl_in {
 470         __u64   fh;
 471         __u32   flags;
 472         __u32   cmd;
 473         __u64   arg;
 474         __u32   in_size;
 475         __u32   out_size;
 476 };
 477
 478 struct fuse_ioctl_out {
 479         __s32   result;
 480         __u32   flags;
 481         __u32   in_iovs;
 482         __u32   out_iovs;
 483 };
 484
 485 struct fuse_poll_in {
 486         __u64   fh;
 487         __u64   kh;
 488         __u32   flags;
 489         __u32   padding;
 490 };
 491
 492 struct fuse_poll_out {
 493         __u32   revents;
 494         __u32   padding;
 495 };
 496
 497 struct fuse_notify_poll_wakeup_out {
 498         __u64   kh;
 499 };
 500
 501 struct fuse_in_header {
 502         __u32   len;
 503         __u32   opcode;
 504         __u64   unique;
 505         __u64   nodeid;
 506         __u32   uid;
 507         __u32   gid;
 508         __u32   pid;
 509         __u32   padding;
 510 };
 511
 512 struct fuse_out_header {
 513         __u32   len;
 514         __s32   error;
 515         __u64   unique;
 516 };
 517
 518 struct fuse_dirent {
 519         __u64   ino;
 520         __u64   off;
 521         __u32   namelen;
 522         __u32   type;
 523         char name[0];
 524 };
 525
 526 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 527 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 528 #define FUSE_DIRENT_SIZE(d) \
 529         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
 530
 531 struct fuse_notify_inval_inode_out {
 532         __u64   ino;
 533         __s64   off;
 534         __s64   len;
 535 };
 536
 537 struct fuse_notify_inval_entry_out {
 538         __u64   parent;
 539         __u32   namelen;
 540         __u32   padding;
 541 };
 542
 543 #endif /* _LINUX_FUSE_H */