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  * 7.18
  55  *  - add FUSE_IOCTL_DIR flag
  56  *  - add FUSE_NOTIFY_DELETE
  57  *
  58  * 7.19
  59  *  - add FUSE_FALLOCATE
  60  */
  61
  62 #ifndef _LINUX_FUSE_H
  63 #define _LINUX_FUSE_H
  64
  65 #include <linux/types.h>
  66
  67 /*
  68  * Version negotiation:
  69  *
  70  * Both the kernel and userspace send the version they support in the
  71  * INIT request and reply respectively.
  72  *
  73  * If the major versions match then both shall use the smallest
  74  * of the two minor versions for communication.
  75  *
  76  * If the kernel supports a larger major version, then userspace shall
  77  * reply with the major version it supports, ignore the rest of the
  78  * INIT message and expect a new INIT message from the kernel with a
  79  * matching major version.
  80  *
  81  * If the library supports a larger major version, then it shall fall
  82  * back to the major protocol version sent by the kernel for
  83  * communication and reply with that major version (and an arbitrary
  84  * supported minor version).
  85  */
  86
  87 /** Version number of this interface */
  88 #define FUSE_KERNEL_VERSION 7
  89
  90 /** Minor version number of this interface */
  91 #define FUSE_KERNEL_MINOR_VERSION 19
  92
  93 /** The node ID of the root inode */
  94 #define FUSE_ROOT_ID 1
  95
  96 /* Make sure all structures are padded to 64bit boundary, so 32bit
  97    userspace works under 64bit kernels */
  98
  99 struct fuse_attr {
 100         __u64   ino;
 101         __u64   size;
 102         __u64   blocks;
 103         __u64   atime;
 104         __u64   mtime;
 105         __u64   ctime;
 106         __u32   atimensec;
 107         __u32   mtimensec;
 108         __u32   ctimensec;
 109         __u32   mode;
 110         __u32   nlink;
 111         __u32   uid;
 112         __u32   gid;
 113         __u32   rdev;
 114         __u32   blksize;
 115         __u32   padding;
 116 };
 117
 118 struct fuse_kstatfs {
 119         __u64   blocks;
 120         __u64   bfree;
 121         __u64   bavail;
 122         __u64   files;
 123         __u64   ffree;
 124         __u32   bsize;
 125         __u32   namelen;
 126         __u32   frsize;
 127         __u32   padding;
 128         __u32   spare[6];
 129 };
 130
 131 struct fuse_file_lock {
 132         __u64   start;
 133         __u64   end;
 134         __u32   type;
 135         __u32   pid; /* tgid */
 136 };
 137
 138 /**
 139  * Bitmasks for fuse_setattr_in.valid
 140  */
 141 #define FATTR_MODE      (1 << 0)
 142 #define FATTR_UID       (1 << 1)
 143 #define FATTR_GID       (1 << 2)
 144 #define FATTR_SIZE      (1 << 3)
 145 #define FATTR_ATIME     (1 << 4)
 146 #define FATTR_MTIME     (1 << 5)
 147 #define FATTR_FH        (1 << 6)
 148 #define FATTR_ATIME_NOW (1 << 7)
 149 #define FATTR_MTIME_NOW (1 << 8)
 150 #define FATTR_LOCKOWNER (1 << 9)
 151
 152 /**
 153  * Flags returned by the OPEN request
 154  *
 155  * FOPEN_DIRECT_IO: bypass page cache for this open file
 156  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 157  * FOPEN_NONSEEKABLE: the file is not seekable
 158  */
 159 #define FOPEN_DIRECT_IO         (1 << 0)
 160 #define FOPEN_KEEP_CACHE        (1 << 1)
 161 #define FOPEN_NONSEEKABLE       (1 << 2)
 162
 163 /**
 164  * INIT request/reply flags
 165  *
 166  * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
 167  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 168  * FUSE_DONT_MASK: don't apply umask to file mode on create operations
 169  * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
 170  */
 171 #define FUSE_ASYNC_READ         (1 << 0)
 172 #define FUSE_POSIX_LOCKS        (1 << 1)
 173 #define FUSE_FILE_OPS           (1 << 2)
 174 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 175 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 176 #define FUSE_BIG_WRITES         (1 << 5)
 177 #define FUSE_DONT_MASK          (1 << 6)
 178 #define FUSE_FLOCK_LOCKS        (1 << 10)
 179
 180 /**
 181  * CUSE INIT request/reply flags
 182  *
 183  * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
 184  */
 185 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
 186
 187 /**
 188  * Release flags
 189  */
 190 #define FUSE_RELEASE_FLUSH      (1 << 0)
 191 #define FUSE_RELEASE_FLOCK_UNLOCK       (1 << 1)
 192
 193 /**
 194  * Getattr flags
 195  */
 196 #define FUSE_GETATTR_FH         (1 << 0)
 197
 198 /**
 199  * Lock flags
 200  */
 201 #define FUSE_LK_FLOCK           (1 << 0)
 202
 203 /**
 204  * WRITE flags
 205  *
 206  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 207  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 208  */
 209 #define FUSE_WRITE_CACHE        (1 << 0)
 210 #define FUSE_WRITE_LOCKOWNER    (1 << 1)
 211
 212 /**
 213  * Read flags
 214  */
 215 #define FUSE_READ_LOCKOWNER     (1 << 1)
 216
 217 /**
 218  * Ioctl flags
 219  *
 220  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
 221  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
 222  * FUSE_IOCTL_RETRY: retry with new iovecs
 223  * FUSE_IOCTL_32BIT: 32bit ioctl
 224  * FUSE_IOCTL_DIR: is a directory
 225  *
 226  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
 227  */
 228 #define FUSE_IOCTL_COMPAT       (1 << 0)
 229 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
 230 #define FUSE_IOCTL_RETRY        (1 << 2)
 231 #define FUSE_IOCTL_32BIT        (1 << 3)
 232 #define FUSE_IOCTL_DIR          (1 << 4)
 233
 234 #define FUSE_IOCTL_MAX_IOV      256
 235
 236 /**
 237  * Poll flags
 238  *
 239  * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
 240  */
 241 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
 242
 243 enum fuse_opcode {
 244         FUSE_LOOKUP        = 1,
 245         FUSE_FORGET        = 2,  /* no reply */
 246         FUSE_GETATTR       = 3,
 247         FUSE_SETATTR       = 4,
 248         FUSE_READLINK      = 5,
 249         FUSE_SYMLINK       = 6,
 250         FUSE_MKNOD         = 8,
 251         FUSE_MKDIR         = 9,
 252         FUSE_UNLINK        = 10,
 253         FUSE_RMDIR         = 11,
 254         FUSE_RENAME        = 12,
 255         FUSE_LINK          = 13,
 256         FUSE_OPEN          = 14,
 257         FUSE_READ          = 15,
 258         FUSE_WRITE         = 16,
 259         FUSE_STATFS        = 17,
 260         FUSE_RELEASE       = 18,
 261         FUSE_FSYNC         = 20,
 262         FUSE_SETXATTR      = 21,
 263         FUSE_GETXATTR      = 22,
 264         FUSE_LISTXATTR     = 23,
 265         FUSE_REMOVEXATTR   = 24,
 266         FUSE_FLUSH         = 25,
 267         FUSE_INIT          = 26,
 268         FUSE_OPENDIR       = 27,
 269         FUSE_READDIR       = 28,
 270         FUSE_RELEASEDIR    = 29,
 271         FUSE_FSYNCDIR      = 30,
 272         FUSE_GETLK         = 31,
 273         FUSE_SETLK         = 32,
 274         FUSE_SETLKW        = 33,
 275         FUSE_ACCESS        = 34,
 276         FUSE_CREATE        = 35,
 277         FUSE_INTERRUPT     = 36,
 278         FUSE_BMAP          = 37,
 279         FUSE_DESTROY       = 38,
 280         FUSE_IOCTL         = 39,
 281         FUSE_POLL          = 40,
 282         FUSE_NOTIFY_REPLY  = 41,
 283         FUSE_BATCH_FORGET  = 42,
 284         FUSE_FALLOCATE     = 43,
 285
 286         /* CUSE specific operations */
 287         CUSE_INIT          = 4096,
 288 };
 289
 290 enum fuse_notify_code {
 291         FUSE_NOTIFY_POLL   = 1,
 292         FUSE_NOTIFY_INVAL_INODE = 2,
 293         FUSE_NOTIFY_INVAL_ENTRY = 3,
 294         FUSE_NOTIFY_STORE = 4,
 295         FUSE_NOTIFY_RETRIEVE = 5,
 296         FUSE_NOTIFY_DELETE = 6,
 297         FUSE_NOTIFY_CODE_MAX,
 298 };
 299
 300 /* The read buffer is required to be at least 8k, but may be much larger */
 301 #define FUSE_MIN_READ_BUFFER 8192
 302
 303 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
 304
 305 struct fuse_entry_out {
 306         __u64   nodeid;         /* Inode ID */
 307         __u64   generation;     /* Inode generation: nodeid:gen must
 308                                    be unique for the fs's lifetime */
 309         __u64   entry_valid;    /* Cache timeout for the name */
 310         __u64   attr_valid;     /* Cache timeout for the attributes */
 311         __u32   entry_valid_nsec;
 312         __u32   attr_valid_nsec;
 313         struct fuse_attr attr;
 314 };
 315
 316 struct fuse_forget_in {
 317         __u64   nlookup;
 318 };
 319
 320 struct fuse_forget_one {
 321         __u64   nodeid;
 322         __u64   nlookup;
 323 };
 324
 325 struct fuse_batch_forget_in {
 326         __u32   count;
 327         __u32   dummy;
 328 };
 329
 330 struct fuse_getattr_in {
 331         __u32   getattr_flags;
 332         __u32   dummy;
 333         __u64   fh;
 334 };
 335
 336 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
 337
 338 struct fuse_attr_out {
 339         __u64   attr_valid;     /* Cache timeout for the attributes */
 340         __u32   attr_valid_nsec;
 341         __u32   dummy;
 342         struct fuse_attr attr;
 343 };
 344
 345 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
 346
 347 struct fuse_mknod_in {
 348         __u32   mode;
 349         __u32   rdev;
 350         __u32   umask;
 351         __u32   padding;
 352 };
 353
 354 struct fuse_mkdir_in {
 355         __u32   mode;
 356         __u32   umask;
 357 };
 358
 359 struct fuse_rename_in {
 360         __u64   newdir;
 361 };
 362
 363 struct fuse_link_in {
 364         __u64   oldnodeid;
 365 };
 366
 367 struct fuse_setattr_in {
 368         __u32   valid;
 369         __u32   padding;
 370         __u64   fh;
 371         __u64   size;
 372         __u64   lock_owner;
 373         __u64   atime;
 374         __u64   mtime;
 375         __u64   unused2;
 376         __u32   atimensec;
 377         __u32   mtimensec;
 378         __u32   unused3;
 379         __u32   mode;
 380         __u32   unused4;
 381         __u32   uid;
 382         __u32   gid;
 383         __u32   unused5;
 384 };
 385
 386 struct fuse_open_in {
 387         __u32   flags;
 388         __u32   unused;
 389 };
 390
 391 struct fuse_create_in {
 392         __u32   flags;
 393         __u32   mode;
 394         __u32   umask;
 395         __u32   padding;
 396 };
 397
 398 struct fuse_open_out {
 399         __u64   fh;
 400         __u32   open_flags;
 401         __u32   padding;
 402 };
 403
 404 struct fuse_release_in {
 405         __u64   fh;
 406         __u32   flags;
 407         __u32   release_flags;
 408         __u64   lock_owner;
 409 };
 410
 411 struct fuse_flush_in {
 412         __u64   fh;
 413         __u32   unused;
 414         __u32   padding;
 415         __u64   lock_owner;
 416 };
 417
 418 struct fuse_read_in {
 419         __u64   fh;
 420         __u64   offset;
 421         __u32   size;
 422         __u32   read_flags;
 423         __u64   lock_owner;
 424         __u32   flags;
 425         __u32   padding;
 426 };
 427
 428 #define FUSE_COMPAT_WRITE_IN_SIZE 24
 429
 430 struct fuse_write_in {
 431         __u64   fh;
 432         __u64   offset;
 433         __u32   size;
 434         __u32   write_flags;
 435         __u64   lock_owner;
 436         __u32   flags;
 437         __u32   padding;
 438 };
 439
 440 struct fuse_write_out {
 441         __u32   size;
 442         __u32   padding;
 443 };
 444
 445 #define FUSE_COMPAT_STATFS_SIZE 48
 446
 447 struct fuse_statfs_out {
 448         struct fuse_kstatfs st;
 449 };
 450
 451 struct fuse_fsync_in {
 452         __u64   fh;
 453         __u32   fsync_flags;
 454         __u32   padding;
 455 };
 456
 457 struct fuse_setxattr_in {
 458         __u32   size;
 459         __u32   flags;
 460 };
 461
 462 struct fuse_getxattr_in {
 463         __u32   size;
 464         __u32   padding;
 465 };
 466
 467 struct fuse_getxattr_out {
 468         __u32   size;
 469         __u32   padding;
 470 };
 471
 472 struct fuse_lk_in {
 473         __u64   fh;
 474         __u64   owner;
 475         struct fuse_file_lock lk;
 476         __u32   lk_flags;
 477         __u32   padding;
 478 };
 479
 480 struct fuse_lk_out {
 481         struct fuse_file_lock lk;
 482 };
 483
 484 struct fuse_access_in {
 485         __u32   mask;
 486         __u32   padding;
 487 };
 488
 489 struct fuse_init_in {
 490         __u32   major;
 491         __u32   minor;
 492         __u32   max_readahead;
 493         __u32   flags;
 494 };
 495
 496 struct fuse_init_out {
 497         __u32   major;
 498         __u32   minor;
 499         __u32   max_readahead;
 500         __u32   flags;
 501         __u16   max_background;
 502         __u16   congestion_threshold;
 503         __u32   max_write;
 504 };
 505
 506 #define CUSE_INIT_INFO_MAX 4096
 507
 508 struct cuse_init_in {
 509         __u32   major;
 510         __u32   minor;
 511         __u32   unused;
 512         __u32   flags;
 513 };
 514
 515 struct cuse_init_out {
 516         __u32   major;
 517         __u32   minor;
 518         __u32   unused;
 519         __u32   flags;
 520         __u32   max_read;
 521         __u32   max_write;
 522         __u32   dev_major;              /* chardev major */
 523         __u32   dev_minor;              /* chardev minor */
 524         __u32   spare[10];
 525 };
 526
 527 struct fuse_interrupt_in {
 528         __u64   unique;
 529 };
 530
 531 struct fuse_bmap_in {
 532         __u64   block;
 533         __u32   blocksize;
 534         __u32   padding;
 535 };
 536
 537 struct fuse_bmap_out {
 538         __u64   block;
 539 };
 540
 541 struct fuse_ioctl_in {
 542         __u64   fh;
 543         __u32   flags;
 544         __u32   cmd;
 545         __u64   arg;
 546         __u32   in_size;
 547         __u32   out_size;
 548 };
 549
 550 struct fuse_ioctl_iovec {
 551         __u64   base;
 552         __u64   len;
 553 };
 554
 555 struct fuse_ioctl_out {
 556         __s32   result;
 557         __u32   flags;
 558         __u32   in_iovs;
 559         __u32   out_iovs;
 560 };
 561
 562 struct fuse_poll_in {
 563         __u64   fh;
 564         __u64   kh;
 565         __u32   flags;
 566         __u32   padding;
 567 };
 568
 569 struct fuse_poll_out {
 570         __u32   revents;
 571         __u32   padding;
 572 };
 573
 574 struct fuse_notify_poll_wakeup_out {
 575         __u64   kh;
 576 };
 577
 578 struct fuse_fallocate_in {
 579         __u64   fh;
 580         __u64   offset;
 581         __u64   length;
 582         __u32   mode;
 583         __u32   padding;
 584 };
 585
 586 struct fuse_in_header {
 587         __u32   len;
 588         __u32   opcode;
 589         __u64   unique;
 590         __u64   nodeid;
 591         __u32   uid;
 592         __u32   gid;
 593         __u32   pid;
 594         __u32   padding;
 595 };
 596
 597 struct fuse_out_header {
 598         __u32   len;
 599         __s32   error;
 600         __u64   unique;
 601 };
 602
 603 struct fuse_dirent {
 604         __u64   ino;
 605         __u64   off;
 606         __u32   namelen;
 607         __u32   type;
 608         char name[];
 609 };
 610
 611 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
 612 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
 613 #define FUSE_DIRENT_SIZE(d) \
 614         FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
 615
 616 struct fuse_notify_inval_inode_out {
 617         __u64   ino;
 618         __s64   off;
 619         __s64   len;
 620 };
 621
 622 struct fuse_notify_inval_entry_out {
 623         __u64   parent;
 624         __u32   namelen;
 625         __u32   padding;
 626 };
 627
 628 struct fuse_notify_delete_out {
 629         __u64   parent;
 630         __u64   child;
 631         __u32   namelen;
 632         __u32   padding;
 633 };
 634
 635 struct fuse_notify_store_out {
 636         __u64   nodeid;
 637         __u64   offset;
 638         __u32   size;
 639         __u32   padding;
 640 };
 641
 642 struct fuse_notify_retrieve_out {
 643         __u64   notify_unique;
 644         __u64   nodeid;
 645         __u64   offset;
 646         __u32   size;
 647         __u32   padding;
 648 };
 649
 650 /* Matches the size of fuse_write_in */
 651 struct fuse_notify_retrieve_in {
 652         __u64   dummy1;
 653         __u64   offset;
 654         __u32   size;
 655         __u32   dummy2;
 656         __u64   dummy3;
 657         __u64   dummy4;
 658 };
 659
 660 #endif /* _LINUX_FUSE_H */