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  * 7.16
  46  *  - add BATCH_FORGET request
  47  *  - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct
  48  *    fuse_ioctl_iovec' instead of ambiguous 'struct iovec'
  49  *  - add FUSE_IOCTL_32BIT flag
  50  *
  51  * 7.17
  52  *  - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
  53  */
  54
  55 #ifndef _LINUX_FUSE_H
  56 #define _LINUX_FUSE_H
  57
  58 #include <linux/types.h>
  59
  60 /*
  61  * Version negotiation:
  62  *
  63  * Both the kernel and userspace send the version they support in the
  64  * INIT request and reply respectively.
  65  *
  66  * If the major versions match then both shall use the smallest
  67  * of the two minor versions for communication.
  68  *
  69  * If the kernel supports a larger major version, then userspace shall
  70  * reply with the major version it supports, ignore the rest of the
  71  * INIT message and expect a new INIT message from the kernel with a
  72  * matching major version.
  73  *
  74  * If the library supports a larger major version, then it shall fall
  75  * back to the major protocol version sent by the kernel for
  76  * communication and reply with that major version (and an arbitrary
  77  * supported minor version).
  78  */
  79
  80 /** Version number of this interface */
  81 #define FUSE_KERNEL_VERSION 7
  82
  83 /** Minor version number of this interface */
  84 #define FUSE_KERNEL_MINOR_VERSION 17
  85
  86 /** The node ID of the root inode */
  87 #define FUSE_ROOT_ID 1
  88
  89 /* Make sure all structures are padded to 64bit boundary, so 32bit
  90    userspace works under 64bit kernels */
  91
  92 struct fuse_attr {
  93         __u64   ino;
  94         __u64   size;
  95         __u64   blocks;
  96         __u64   atime;
  97         __u64   mtime;
  98         __u64   ctime;
  99         __u32   atimensec;
 100         __u32   mtimensec;
 101         __u32   ctimensec;
 102         __u32   mode;
 103         __u32   nlink;
 104         __u32   uid;
 105         __u32   gid;
 106         __u32   rdev;
 107         __u32   blksize;
 108         __u32   padding;
 109 };
 110
 111 struct fuse_kstatfs {
 112         __u64   blocks;
 113         __u64   bfree;
 114         __u64   bavail;
 115         __u64   files;
 116         __u64   ffree;
 117         __u32   bsize;
 118         __u32   namelen;
 119         __u32   frsize;
 120         __u32   padding;
 121         __u32   spare[6];
 122 };
 123
 124 struct fuse_file_lock {
 125         __u64   start;
 126         __u64   end;
 127         __u32   type;
 128         __u32   pid; /* tgid */
 129 };
 130
 131 /**
 132  * Bitmasks for fuse_setattr_in.valid
 133  */
 134 #define FATTR_MODE      (1 << 0)
 135 #define FATTR_UID       (1 << 1)
 136 #define FATTR_GID       (1 << 2)
 137 #define FATTR_SIZE      (1 << 3)
 138 #define FATTR_ATIME     (1 << 4)
 139 #define FATTR_MTIME     (1 << 5)
 140 #define FATTR_FH        (1 << 6)
 141 #define FATTR_ATIME_NOW (1 << 7)
 142 #define FATTR_MTIME_NOW (1 << 8)
 143 #define FATTR_LOCKOWNER (1 << 9)
 144
 145 /**
 146  * Flags returned by the OPEN request
 147  *
 148  * FOPEN_DIRECT_IO: bypass page cache for this open file
 149  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 150  * FOPEN_NONSEEKABLE: the file is not seekable
 151  */
 152 #define FOPEN_DIRECT_IO         (1 << 0)
 153 #define FOPEN_KEEP_CACHE        (1 << 1)
 154 #define FOPEN_NONSEEKABLE       (1 << 2)
 155
 156 /**
 157  * INIT request/reply flags
 158  *
 159  * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
 160  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 161  * FUSE_DONT_MASK: don't apply umask to file mode on create operations
 162  * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
 163  */
 164 #define FUSE_ASYNC_READ         (1 << 0)
 165 #define FUSE_POSIX_LOCKS        (1 << 1)
 166 #define FUSE_FILE_OPS           (1 << 2)
 167 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 168 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 169 #define FUSE_BIG_WRITES         (1 << 5)
 170 #define FUSE_DONT_MASK          (1 << 6)
 171 #define FUSE_FLOCK_LOCKS        (1 << 10)
 172
 173 /**
 174  * CUSE INIT request/reply flags
 175  *
 176  * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
 177  */
 178 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
 179
 180 /**
 181  * Release flags
 182  */
 183 #define FUSE_RELEASE_FLUSH      (1 << 0)
 184 #define FUSE_RELEASE_FLOCK_UNLOCK       (1 << 1)
 185
 186 /**
 187  * Getattr flags
 188  */
 189 #define FUSE_GETATTR_FH         (1 << 0)
 190
 191 /**
 192  * Lock flags
 193  */
 194 #define FUSE_LK_FLOCK           (1 << 0)
 195
 196 /**
 197  * WRITE flags
 198  *
 199  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 200  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 201  */
 202 #define FUSE_WRITE_CACHE        (1 << 0)
 203 #define FUSE_WRITE_LOCKOWNER    (1 << 1)
 204
 205 /**
 206  * Read flags
 207  */
 208 #define FUSE_READ_LOCKOWNER     (1 << 1)
 209
 210 /**
 211  * Ioctl flags
 212  *
 213  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
 214  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
 215  * FUSE_IOCTL_RETRY: retry with new iovecs
 216  * FUSE_IOCTL_32BIT: 32bit ioctl
 217  *
 218  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
 219  */
 220 #define FUSE_IOCTL_COMPAT       (1 << 0)
 221 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
 222 #define FUSE_IOCTL_RETRY        (1 << 2)
 223 #define FUSE_IOCTL_32BIT        (1 << 3)
 224
 225 #define FUSE_IOCTL_MAX_IOV      256
 226
 227 /**
 228  * Poll flags
 229  *
 230  * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
 231  */
 232 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
 233
 234 enum fuse_opcode {
 235         FUSE_LOOKUP        = 1,
 236         FUSE_FORGET        = 2,  /* no reply */
 237         FUSE_GETATTR       = 3,
 238         FUSE_SETATTR       = 4,
 239         FUSE_READLINK      = 5,
 240         FUSE_SYMLINK       = 6,
 241         FUSE_MKNOD         = 8,
 242         FUSE_MKDIR         = 9,
 243         FUSE_UNLINK        = 10,
 244         FUSE_RMDIR         = 11,
 245         FUSE_RENAME        = 12,
 246         FUSE_LINK          = 13,
 247         FUSE_OPEN          = 14,
 248         FUSE_READ          = 15,
 249         FUSE_WRITE         = 16,
 250         FUSE_STATFS        = 17,
 251         FUSE_RELEASE       = 18,
 252         FUSE_FSYNC         = 20,
 253         FUSE_SETXATTR      = 21,
 254         FUSE_GETXATTR      = 22,
 255         FUSE_LISTXATTR     = 23,
 256         FUSE_REMOVEXATTR   = 24,
 257         FUSE_FLUSH         = 25,
 258         FUSE_INIT          = 26,
 259         FUSE_OPENDIR       = 27,
 260         FUSE_READDIR       = 28,
 261         FUSE_RELEASEDIR    = 29,
 262         FUSE_FSYNCDIR      = 30,
 263         FUSE_GETLK         = 31,
 264         FUSE_SETLK         = 32,
 265         FUSE_SETLKW        = 33,
 266         FUSE_ACCESS        = 34,
 267         FUSE_CREATE        = 35,
 268         FUSE_INTERRUPT     = 36,
 269         FUSE_BMAP          = 37,
 270         FUSE_DESTROY       = 38,
 271         FUSE_IOCTL         = 39,
 272         FUSE_POLL          = 40,
 273         FUSE_NOTIFY_REPLY  = 41,
 274         FUSE_BATCH_FORGET  = 42,
 275
 276         /* CUSE specific operations */
 277         CUSE_INIT          = 4096,
 278 };
 279
 280 enum fuse_notify_code {
 281         FUSE_NOTIFY_POLL   = 1,
 282         FUSE_NOTIFY_INVAL_INODE = 2,
 283         FUSE_NOTIFY_INVAL_ENTRY = 3,
 284         FUSE_NOTIFY_STORE = 4,
 285         FUSE_NOTIFY_RETRIEVE = 5,
 286         FUSE_NOTIFY_CODE_MAX,
 287 };
 288
 289 /* The read buffer is required to be at least 8k, but may be much larger */
 290 #define FUSE_MIN_READ_BUFFER 8192
 291
 292 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
 293
 294 struct fuse_entry_out {
 295         __u64   nodeid;         /* Inode ID */
 296         __u64   generation;     /* Inode generation: nodeid:gen must
 297                                    be unique for the fs's lifetime */
 298         __u64   entry_valid;    /* Cache timeout for the name */
 299         __u64   attr_valid;     /* Cache timeout for the attributes */
 300         __u32   entry_valid_nsec;
 301         __u32   attr_valid_nsec;
 302         struct fuse_attr attr;
 303 };
 304
 305 struct fuse_forget_in {
 306         __u64   nlookup;
 307 };
 308
 309 struct fuse_forget_one {
 310         __u64   nodeid;
 311         __u64   nlookup;
 312 };
 313
 314 struct fuse_batch_forget_in {
 315         __u32   count;
 316         __u32   dummy;
 317 };
 318
 319 struct fuse_getattr_in {
 320         __u32   getattr_flags;
 321         __u32   dummy;
 322         __u64   fh;
 323 };
 324
 325 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
 326
 327 struct fuse_attr_out {
 328         __u64   attr_valid;     /* Cache timeout for the attributes */
 329         __u32   attr_valid_nsec;
 330         __u32   dummy;
 331         struct fuse_attr attr;
 332 };
 333
 334 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
 335
 336 struct fuse_mknod_in {
 337         __u32   mode;
 338         __u32   rdev;
 339         __u32   umask;
 340         __u32   padding;
 341 };
 342
 343 struct fuse_mkdir_in {
 344         __u32   mode;
 345         __u32   umask;
 346 };
 347
 348 struct fuse_rename_in {
 349         __u64   newdir;
 350 };
 351
 352 struct fuse_link_in {
 353         __u64   oldnodeid;
 354 };
 355
 356 struct fuse_setattr_in {
 357         __u32   valid;
 358         __u32   padding;
 359         __u64   fh;
 360         __u64   size;
 361         __u64   lock_owner;
 362         __u64   atime;
 363         __u64   mtime;
 364         __u64   unused2;
 365         __u32   atimensec;
 366         __u32   mtimensec;
 367         __u32   unused3;
 368         __u32   mode;
 369         __u32   unused4;
 370         __u32   uid;
 371         __u32   gid;
 372         __u32   unused5;
 373 };
 374
 375 struct fuse_open_in {
 376         __u32   flags;
 377         __u32   unused;
 378 };
 379
 380 struct fuse_create_in {
 381         __u32   flags;
 382         __u32   mode;
 383         __u32   umask;
 384         __u32   padding;
 385 };
 386
 387 struct fuse_open_out {
 388         __u64   fh;
 389         __u32   open_flags;
 390         __u32   padding;
 391 };
 392
 393 struct fuse_release_in {
 394         __u64   fh;
 395         __u32   flags;
 396         __u32   release_flags;
 397         __u64   lock_owner;
 398 };
 399
 400 struct fuse_flush_in {
 401         __u64   fh;
 402         __u32   unused;
 403         __u32   padding;
 404         __u64   lock_owner;
 405 };
 406
 407 struct fuse_read_in {
 408         __u64   fh;
 409         __u64   offset;
 410         __u32   size;
 411         __u32   read_flags;
 412         __u64   lock_owner;
 413         __u32   flags;
 414         __u32   padding;
 415 };
 416
 417 #define FUSE_COMPAT_WRITE_IN_SIZE 24
 418
 419 struct fuse_write_in {
 420         __u64   fh;
 421         __u64   offset;
 422         __u32   size;
 423         __u32   write_flags;
 424         __u64   lock_owner;
 425         __u32   flags;
 426         __u32   padding;
 427 };
 428
 429 struct fuse_write_out {
 430         __u32   size;
 431         __u32   padding;
 432 };
 433
 434 #define FUSE_COMPAT_STATFS_SIZE 48
 435
 436 struct fuse_statfs_out {
 437         struct fuse_kstatfs st;
 438 };
 439
 440 struct fuse_fsync_in {
 441         __u64   fh;
 442         __u32   fsync_flags;
 443         __u32   padding;
 444 };
 445
 446 struct fuse_setxattr_in {
 447         __u32   size;
 448         __u32   flags;
 449 };
 450
 451 struct fuse_getxattr_in {
 452         __u32   size;
 453         __u32   padding;
 454 };
 455
 456 struct fuse_getxattr_out {
 457         __u32   size;
 458         __u32   padding;
 459 };
 460
 461 struct fuse_lk_in {
 462         __u64   fh;
 463         __u64   owner;
 464         struct fuse_file_lock lk;
 465         __u32   lk_flags;
 466         __u32   padding;
 467 };
 468
 469 struct fuse_lk_out {
 470         struct fuse_file_lock lk;
 471 };
 472
 473 struct fuse_access_in {
 474         __u32   mask;
 475         __u32   padding;
 476 };
 477
 478 struct fuse_init_in {
 479         __u32   major;
 480         __u32   minor;
 481         __u32   max_readahead;
 482         __u32   flags;
 483 };
 484
 485 struct fuse_init_out {
 486         __u32   major;
 487         __u32   minor;
 488         __u32   max_readahead;
 489         __u32   flags;
 490         __u16   max_background;
 491         __u16   congestion_threshold;
 492         __u32   max_write;
 493 };
 494
 495 #define CUSE_INIT_INFO_MAX 4096
 496
 497 struct cuse_init_in {
 498         __u32   major;
 499         __u32   minor;
 500         __u32   unused;
 501         __u32   flags;
 502 };
 503
 504 struct cuse_init_out {
 505         __u32   major;
 506         __u32   minor;
 507         __u32   unused;
 508         __u32   flags;
 509         __u32   max_read;
 510         __u32   max_write;
 511         __u32   dev_major;              /* chardev major */
 512         __u32   dev_minor;              /* chardev minor */
 513         __u32   spare[10];
 514 };
 515
 516 struct fuse_interrupt_in {
 517         __u64   unique;
 518 };
 519
 520 struct fuse_bmap_in {
 521         __u64   block;
 522         __u32   blocksize;
 523         __u32   padding;
 524 };
 525
 526 struct fuse_bmap_out {
 527         __u64   block;
 528 };
 529
 530 struct fuse_ioctl_in {
 531         __u64   fh;
 532         __u32   flags;
 533         __u32   cmd;
 534         __u64   arg;
 535         __u32   in_size;
 536         __u32   out_size;
 537 };
 538
 539 struct fuse_ioctl_iovec {
 540         __u64   base;
 541         __u64   len;
 542 };
 543
 544 struct fuse_ioctl_out {
 545         __s32   result;
 546         __u32   flags;
 547         __u32   in_iovs;
 548         __u32   out_iovs;
 549 };
 550
 551 struct fuse_poll_in {
 552         __u64   fh;
 553         __u64   kh;
 554         __u32   flags;
 555         __u32   padding;
 556 };
 557
 558 struct fuse_poll_out {
 559         __u32   revents;
 560         __u32   padding;
 561 };
 562
 563 struct fuse_notify_poll_wakeup_out {
 564         __u64   kh;
 565 };
 566
 567 struct fuse_in_header {
 568         __u32   len;
 569         __u32   opcode;
 570         __u64   unique;
 571         __u64   nodeid;
 572         __u32   uid;
 573         __u32   gid;
 574         __u32   pid;
 575         __u32   padding;
 576 };
 577
 578 struct fuse_out_header {
 579         __u32   len;
 580         __s32   error;
 581         __u64   unique;
 582 };
 583
 584 struct fuse_dirent {
 585         __u64   ino;
 586         __u64   off;
 587         __u32   namelen;
 588         __u32   type;
 589         char name[0];
 590 };
 591
 592 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 593 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 594 #define FUSE_DIRENT_SIZE(d) \
 595         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
 596
 597 struct fuse_notify_inval_inode_out {
 598         __u64   ino;
 599         __s64   off;
 600         __s64   len;
 601 };
 602
 603 struct fuse_notify_inval_entry_out {
 604         __u64   parent;
 605         __u32   namelen;
 606         __u32   padding;
 607 };
 608
 609 struct fuse_notify_store_out {
 610         __u64   nodeid;
 611         __u64   offset;
 612         __u32   size;
 613         __u32   padding;
 614 };
 615
 616 struct fuse_notify_retrieve_out {
 617         __u64   notify_unique;
 618         __u64   nodeid;
 619         __u64   offset;
 620         __u32   size;
 621         __u32   padding;
 622 };
 623
 624 /* Matches the size of fuse_write_in */
 625 struct fuse_notify_retrieve_in {
 626         __u64   dummy1;
 627         __u64   offset;
 628         __u32   size;
 629         __u32   dummy2;
 630         __u64   dummy3;
 631         __u64   dummy4;
 632 };
 633
 634 #endif /* _LINUX_FUSE_H */