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