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