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  * 7.13
  35  *  - make max number of background requests and congestion threshold
  36  *    tunables
  37  *
  38  * 7.14
  39  *  - add splice support to fuse device
  40  *
  41  * 7.15
  42  *  - add store notify
  43  *  - add retrieve notify
  44  */
  45
  46 #ifndef _LINUX_FUSE_H
  47 #define _LINUX_FUSE_H
  48
  49 #include <linux/types.h>
  50
  51 /*
  52  * Version negotiation:
  53  *
  54  * Both the kernel and userspace send the version they support in the
  55  * INIT request and reply respectively.
  56  *
  57  * If the major versions match then both shall use the smallest
  58  * of the two minor versions for communication.
  59  *
  60  * If the kernel supports a larger major version, then userspace shall
  61  * reply with the major version it supports, ignore the rest of the
  62  * INIT message and expect a new INIT message from the kernel with a
  63  * matching major version.
  64  *
  65  * If the library supports a larger major version, then it shall fall
  66  * back to the major protocol version sent by the kernel for
  67  * communication and reply with that major version (and an arbitrary
  68  * supported minor version).
  69  */
  70
  71 /** Version number of this interface */
  72 #define FUSE_KERNEL_VERSION 7
  73
  74 /** Minor version number of this interface */
  75 #define FUSE_KERNEL_MINOR_VERSION 15
  76
  77 /** The node ID of the root inode */
  78 #define FUSE_ROOT_ID 1
  79
  80 /* Make sure all structures are padded to 64bit boundary, so 32bit
  81    userspace works under 64bit kernels */
  82
  83 struct fuse_attr {
  84         __u64   ino;
  85         __u64   size;
  86         __u64   blocks;
  87         __u64   atime;
  88         __u64   mtime;
  89         __u64   ctime;
  90         __u32   atimensec;
  91         __u32   mtimensec;
  92         __u32   ctimensec;
  93         __u32   mode;
  94         __u32   nlink;
  95         __u32   uid;
  96         __u32   gid;
  97         __u32   rdev;
  98         __u32   blksize;
  99         __u32   padding;
 100 };
 101
 102 struct fuse_kstatfs {
 103         __u64   blocks;
 104         __u64   bfree;
 105         __u64   bavail;
 106         __u64   files;
 107         __u64   ffree;
 108         __u32   bsize;
 109         __u32   namelen;
 110         __u32   frsize;
 111         __u32   padding;
 112         __u32   spare[6];
 113 };
 114
 115 struct fuse_file_lock {
 116         __u64   start;
 117         __u64   end;
 118         __u32   type;
 119         __u32   pid; /* tgid */
 120 };
 121
 122 /**
 123  * Bitmasks for fuse_setattr_in.valid
 124  */
 125 #define FATTR_MODE      (1 << 0)
 126 #define FATTR_UID       (1 << 1)
 127 #define FATTR_GID       (1 << 2)
 128 #define FATTR_SIZE      (1 << 3)
 129 #define FATTR_ATIME     (1 << 4)
 130 #define FATTR_MTIME     (1 << 5)
 131 #define FATTR_FH        (1 << 6)
 132 #define FATTR_ATIME_NOW (1 << 7)
 133 #define FATTR_MTIME_NOW (1 << 8)
 134 #define FATTR_LOCKOWNER (1 << 9)
 135
 136 /**
 137  * Flags returned by the OPEN request
 138  *
 139  * FOPEN_DIRECT_IO: bypass page cache for this open file
 140  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 141  * FOPEN_NONSEEKABLE: the file is not seekable
 142  */
 143 #define FOPEN_DIRECT_IO         (1 << 0)
 144 #define FOPEN_KEEP_CACHE        (1 << 1)
 145 #define FOPEN_NONSEEKABLE       (1 << 2)
 146
 147 /**
 148  * INIT request/reply flags
 149  *
 150  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 151  * FUSE_DONT_MASK: don't apply umask to file mode on create operations
 152  */
 153 #define FUSE_ASYNC_READ         (1 << 0)
 154 #define FUSE_POSIX_LOCKS        (1 << 1)
 155 #define FUSE_FILE_OPS           (1 << 2)
 156 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 157 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 158 #define FUSE_BIG_WRITES         (1 << 5)
 159 #define FUSE_DONT_MASK          (1 << 6)
 160
 161 /**
 162  * CUSE INIT request/reply flags
 163  *
 164  * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
 165  */
 166 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
 167
 168 /**
 169  * Release flags
 170  */
 171 #define FUSE_RELEASE_FLUSH      (1 << 0)
 172
 173 /**
 174  * Getattr flags
 175  */
 176 #define FUSE_GETATTR_FH         (1 << 0)
 177
 178 /**
 179  * Lock flags
 180  */
 181 #define FUSE_LK_FLOCK           (1 << 0)
 182
 183 /**
 184  * WRITE flags
 185  *
 186  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 187  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 188  */
 189 #define FUSE_WRITE_CACHE        (1 << 0)
 190 #define FUSE_WRITE_LOCKOWNER    (1 << 1)
 191
 192 /**
 193  * Read flags
 194  */
 195 #define FUSE_READ_LOCKOWNER     (1 << 1)
 196
 197 /**
 198  * Ioctl flags
 199  *
 200  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
 201  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
 202  * FUSE_IOCTL_RETRY: retry with new iovecs
 203  *
 204  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
 205  */
 206 #define FUSE_IOCTL_COMPAT       (1 << 0)
 207 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
 208 #define FUSE_IOCTL_RETRY        (1 << 2)
 209
 210 #define FUSE_IOCTL_MAX_IOV      256
 211
 212 /**
 213  * Poll flags
 214  *
 215  * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
 216  */
 217 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
 218
 219 enum fuse_opcode {
 220         FUSE_LOOKUP        = 1,
 221         FUSE_FORGET        = 2,  /* no reply */
 222         FUSE_GETATTR       = 3,
 223         FUSE_SETATTR       = 4,
 224         FUSE_READLINK      = 5,
 225         FUSE_SYMLINK       = 6,
 226         FUSE_MKNOD         = 8,
 227         FUSE_MKDIR         = 9,
 228         FUSE_UNLINK        = 10,
 229         FUSE_RMDIR         = 11,
 230         FUSE_RENAME        = 12,
 231         FUSE_LINK          = 13,
 232         FUSE_OPEN          = 14,
 233         FUSE_READ          = 15,
 234         FUSE_WRITE         = 16,
 235         FUSE_STATFS        = 17,
 236         FUSE_RELEASE       = 18,
 237         FUSE_FSYNC         = 20,
 238         FUSE_SETXATTR      = 21,
 239         FUSE_GETXATTR      = 22,
 240         FUSE_LISTXATTR     = 23,
 241         FUSE_REMOVEXATTR   = 24,
 242         FUSE_FLUSH         = 25,
 243         FUSE_INIT          = 26,
 244         FUSE_OPENDIR       = 27,
 245         FUSE_READDIR       = 28,
 246         FUSE_RELEASEDIR    = 29,
 247         FUSE_FSYNCDIR      = 30,
 248         FUSE_GETLK         = 31,
 249         FUSE_SETLK         = 32,
 250         FUSE_SETLKW        = 33,
 251         FUSE_ACCESS        = 34,
 252         FUSE_CREATE        = 35,
 253         FUSE_INTERRUPT     = 36,
 254         FUSE_BMAP          = 37,
 255         FUSE_DESTROY       = 38,
 256         FUSE_IOCTL         = 39,
 257         FUSE_POLL          = 40,
 258         FUSE_NOTIFY_REPLY  = 41,
 259
 260         /* CUSE specific operations */
 261         CUSE_INIT          = 4096,
 262 };
 263
 264 enum fuse_notify_code {
 265         FUSE_NOTIFY_POLL   = 1,
 266         FUSE_NOTIFY_INVAL_INODE = 2,
 267         FUSE_NOTIFY_INVAL_ENTRY = 3,
 268         FUSE_NOTIFY_STORE = 4,
 269         FUSE_NOTIFY_RETRIEVE = 5,
 270         FUSE_NOTIFY_CODE_MAX,
 271 };
 272
 273 /* The read buffer is required to be at least 8k, but may be much larger */
 274 #define FUSE_MIN_READ_BUFFER 8192
 275
 276 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
 277
 278 struct fuse_entry_out {
 279         __u64   nodeid;         /* Inode ID */
 280         __u64   generation;     /* Inode generation: nodeid:gen must
 281                                    be unique for the fs's lifetime */
 282         __u64   entry_valid;    /* Cache timeout for the name */
 283         __u64   attr_valid;     /* Cache timeout for the attributes */
 284         __u32   entry_valid_nsec;
 285         __u32   attr_valid_nsec;
 286         struct fuse_attr attr;
 287 };
 288
 289 struct fuse_forget_in {
 290         __u64   nlookup;
 291 };
 292
 293 struct fuse_getattr_in {
 294         __u32   getattr_flags;
 295         __u32   dummy;
 296         __u64   fh;
 297 };
 298
 299 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
 300
 301 struct fuse_attr_out {
 302         __u64   attr_valid;     /* Cache timeout for the attributes */
 303         __u32   attr_valid_nsec;
 304         __u32   dummy;
 305         struct fuse_attr attr;
 306 };
 307
 308 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
 309
 310 struct fuse_mknod_in {
 311         __u32   mode;
 312         __u32   rdev;
 313         __u32   umask;
 314         __u32   padding;
 315 };
 316
 317 struct fuse_mkdir_in {
 318         __u32   mode;
 319         __u32   umask;
 320 };
 321
 322 struct fuse_rename_in {
 323         __u64   newdir;
 324 };
 325
 326 struct fuse_link_in {
 327         __u64   oldnodeid;
 328 };
 329
 330 struct fuse_setattr_in {
 331         __u32   valid;
 332         __u32   padding;
 333         __u64   fh;
 334         __u64   size;
 335         __u64   lock_owner;
 336         __u64   atime;
 337         __u64   mtime;
 338         __u64   unused2;
 339         __u32   atimensec;
 340         __u32   mtimensec;
 341         __u32   unused3;
 342         __u32   mode;
 343         __u32   unused4;
 344         __u32   uid;
 345         __u32   gid;
 346         __u32   unused5;
 347 };
 348
 349 struct fuse_open_in {
 350         __u32   flags;
 351         __u32   unused;
 352 };
 353
 354 struct fuse_create_in {
 355         __u32   flags;
 356         __u32   mode;
 357         __u32   umask;
 358         __u32   padding;
 359 };
 360
 361 struct fuse_open_out {
 362         __u64   fh;
 363         __u32   open_flags;
 364         __u32   padding;
 365 };
 366
 367 struct fuse_release_in {
 368         __u64   fh;
 369         __u32   flags;
 370         __u32   release_flags;
 371         __u64   lock_owner;
 372 };
 373
 374 struct fuse_flush_in {
 375         __u64   fh;
 376         __u32   unused;
 377         __u32   padding;
 378         __u64   lock_owner;
 379 };
 380
 381 struct fuse_read_in {
 382         __u64   fh;
 383         __u64   offset;
 384         __u32   size;
 385         __u32   read_flags;
 386         __u64   lock_owner;
 387         __u32   flags;
 388         __u32   padding;
 389 };
 390
 391 #define FUSE_COMPAT_WRITE_IN_SIZE 24
 392
 393 struct fuse_write_in {
 394         __u64   fh;
 395         __u64   offset;
 396         __u32   size;
 397         __u32   write_flags;
 398         __u64   lock_owner;
 399         __u32   flags;
 400         __u32   padding;
 401 };
 402
 403 struct fuse_write_out {
 404         __u32   size;
 405         __u32   padding;
 406 };
 407
 408 #define FUSE_COMPAT_STATFS_SIZE 48
 409
 410 struct fuse_statfs_out {
 411         struct fuse_kstatfs st;
 412 };
 413
 414 struct fuse_fsync_in {
 415         __u64   fh;
 416         __u32   fsync_flags;
 417         __u32   padding;
 418 };
 419
 420 struct fuse_setxattr_in {
 421         __u32   size;
 422         __u32   flags;
 423 };
 424
 425 struct fuse_getxattr_in {
 426         __u32   size;
 427         __u32   padding;
 428 };
 429
 430 struct fuse_getxattr_out {
 431         __u32   size;
 432         __u32   padding;
 433 };
 434
 435 struct fuse_lk_in {
 436         __u64   fh;
 437         __u64   owner;
 438         struct fuse_file_lock lk;
 439         __u32   lk_flags;
 440         __u32   padding;
 441 };
 442
 443 struct fuse_lk_out {
 444         struct fuse_file_lock lk;
 445 };
 446
 447 struct fuse_access_in {
 448         __u32   mask;
 449         __u32   padding;
 450 };
 451
 452 struct fuse_init_in {
 453         __u32   major;
 454         __u32   minor;
 455         __u32   max_readahead;
 456         __u32   flags;
 457 };
 458
 459 struct fuse_init_out {
 460         __u32   major;
 461         __u32   minor;
 462         __u32   max_readahead;
 463         __u32   flags;
 464         __u16   max_background;
 465         __u16   congestion_threshold;
 466         __u32   max_write;
 467 };
 468
 469 #define CUSE_INIT_INFO_MAX 4096
 470
 471 struct cuse_init_in {
 472         __u32   major;
 473         __u32   minor;
 474         __u32   unused;
 475         __u32   flags;
 476 };
 477
 478 struct cuse_init_out {
 479         __u32   major;
 480         __u32   minor;
 481         __u32   unused;
 482         __u32   flags;
 483         __u32   max_read;
 484         __u32   max_write;
 485         __u32   dev_major;              /* chardev major */
 486         __u32   dev_minor;              /* chardev minor */
 487         __u32   spare[10];
 488 };
 489
 490 struct fuse_interrupt_in {
 491         __u64   unique;
 492 };
 493
 494 struct fuse_bmap_in {
 495         __u64   block;
 496         __u32   blocksize;
 497         __u32   padding;
 498 };
 499
 500 struct fuse_bmap_out {
 501         __u64   block;
 502 };
 503
 504 struct fuse_ioctl_in {
 505         __u64   fh;
 506         __u32   flags;
 507         __u32   cmd;
 508         __u64   arg;
 509         __u32   in_size;
 510         __u32   out_size;
 511 };
 512
 513 struct fuse_ioctl_out {
 514         __s32   result;
 515         __u32   flags;
 516         __u32   in_iovs;
 517         __u32   out_iovs;
 518 };
 519
 520 struct fuse_poll_in {
 521         __u64   fh;
 522         __u64   kh;
 523         __u32   flags;
 524         __u32   padding;
 525 };
 526
 527 struct fuse_poll_out {
 528         __u32   revents;
 529         __u32   padding;
 530 };
 531
 532 struct fuse_notify_poll_wakeup_out {
 533         __u64   kh;
 534 };
 535
 536 struct fuse_in_header {
 537         __u32   len;
 538         __u32   opcode;
 539         __u64   unique;
 540         __u64   nodeid;
 541         __u32   uid;
 542         __u32   gid;
 543         __u32   pid;
 544         __u32   padding;
 545 };
 546
 547 struct fuse_out_header {
 548         __u32   len;
 549         __s32   error;
 550         __u64   unique;
 551 };
 552
 553 struct fuse_dirent {
 554         __u64   ino;
 555         __u64   off;
 556         __u32   namelen;
 557         __u32   type;
 558         char name[0];
 559 };
 560
 561 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 562 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 563 #define FUSE_DIRENT_SIZE(d) \
 564         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
 565
 566 struct fuse_notify_inval_inode_out {
 567         __u64   ino;
 568         __s64   off;
 569         __s64   len;
 570 };
 571
 572 struct fuse_notify_inval_entry_out {
 573         __u64   parent;
 574         __u32   namelen;
 575         __u32   padding;
 576 };
 577
 578 struct fuse_notify_store_out {
 579         __u64   nodeid;
 580         __u64   offset;
 581         __u32   size;
 582         __u32   padding;
 583 };
 584
 585 struct fuse_notify_retrieve_out {
 586         __u64   notify_unique;
 587         __u64   nodeid;
 588         __u64   offset;
 589         __u32   size;
 590         __u32   padding;
 591 };
 592
 593 /* Matches the size of fuse_write_in */
 594 struct fuse_notify_retrieve_in {
 595         __u64   dummy1;
 596         __u64   offset;
 597         __u32   size;
 598         __u32   dummy2;
 599         __u64   dummy3;
 600         __u64   dummy4;
 601 };
 602
 603 #endif /* _LINUX_FUSE_H */