1/* 2 This file defines the kernel interface of FUSE 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 This -- and only this -- header file may also be distributed under 9 the terms of the BSD Licence as follows: 10 11 Copyright (C) 2001-2007 Miklos Szeredi. All rights reserved. 12 13 Redistribution and use in source and binary forms, with or without 14 modification, are permitted provided that the following conditions 15 are met: 16 1. Redistributions of source code must retain the above copyright 17 notice, this list of conditions and the following disclaimer. 18 2. Redistributions in binary form must reproduce the above copyright 19 notice, this list of conditions and the following disclaimer in the 20 documentation and/or other materials provided with the distribution. 21 22 THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 26 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 SUCH DAMAGE. 33*/ 34 35/* 36 * This file defines the kernel interface of FUSE 37 * 38 * Protocol changelog: 39 * 40 * 7.9: 41 * - new fuse_getattr_in input argument of GETATTR 42 * - add lk_flags in fuse_lk_in 43 * - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in 44 * - add blksize field to fuse_attr 45 * - add file flags field to fuse_read_in and fuse_write_in 46 * 47 * 7.10 48 * - add nonseekable open flag 49 * 50 * 7.11 51 * - add IOCTL message 52 * - add unsolicited notification support 53 * - add POLL message and NOTIFY_POLL notification 54 * 55 * 7.12 56 * - add umask flag to input argument of open, mknod and mkdir 57 * - add notification messages for invalidation of inodes and 58 * directory entries 59 * 60 * 7.13 61 * - make max number of background requests and congestion threshold 62 * tunables 63 * 64 * 7.14 65 * - add splice support to fuse device 66 * 67 * 7.15 68 * - add store notify 69 * - add retrieve notify 70 * 71 * 7.16 72 * - add BATCH_FORGET request 73 * - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct 74 * fuse_ioctl_iovec' instead of ambiguous 'struct iovec' 75 * - add FUSE_IOCTL_32BIT flag 76 * 77 * 7.17 78 * - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK 79 * 80 * 7.18 81 * - add FUSE_IOCTL_DIR flag 82 * - add FUSE_NOTIFY_DELETE 83 * 84 * 7.19 85 * - add FUSE_FALLOCATE 86 * 87 * 7.20 88 * - add FUSE_AUTO_INVAL_DATA 89 * 90 * 7.21 91 * - add FUSE_READDIRPLUS 92 * - send the requested events in POLL request 93 * 94 * 7.22 95 * - add FUSE_ASYNC_DIO 96 */ 97 98#ifndef _LINUX_FUSE_H 99#define _LINUX_FUSE_H 100 101#ifdef __KERNEL__ 102#include <linux/types.h> 103#else 104#include <stdint.h> 105#endif 106 107/* 108 * Version negotiation: 109 * 110 * Both the kernel and userspace send the version they support in the 111 * INIT request and reply respectively. 112 * 113 * If the major versions match then both shall use the smallest 114 * of the two minor versions for communication. 115 * 116 * If the kernel supports a larger major version, then userspace shall 117 * reply with the major version it supports, ignore the rest of the 118 * INIT message and expect a new INIT message from the kernel with a 119 * matching major version. 120 * 121 * If the library supports a larger major version, then it shall fall 122 * back to the major protocol version sent by the kernel for 123 * communication and reply with that major version (and an arbitrary 124 * supported minor version). 125 */ 126 127/** Version number of this interface */ 128#define FUSE_KERNEL_VERSION 7 129 130/** Minor version number of this interface */ 131#define FUSE_KERNEL_MINOR_VERSION 22 132 133/** The node ID of the root inode */ 134#define FUSE_ROOT_ID 1 135 136/* Make sure all structures are padded to 64bit boundary, so 32bit 137 userspace works under 64bit kernels */ 138 139struct fuse_attr { 140 uint64_t ino; 141 uint64_t size; 142 uint64_t blocks; 143 uint64_t atime; 144 uint64_t mtime; 145 uint64_t ctime; 146 uint32_t atimensec; 147 uint32_t mtimensec; 148 uint32_t ctimensec; 149 uint32_t mode; 150 uint32_t nlink; 151 uint32_t uid; 152 uint32_t gid; 153 uint32_t rdev; 154 uint32_t blksize; 155 uint32_t padding; 156}; 157 158struct fuse_kstatfs { 159 uint64_t blocks; 160 uint64_t bfree; 161 uint64_t bavail; 162 uint64_t files; 163 uint64_t ffree; 164 uint32_t bsize; 165 uint32_t namelen; 166 uint32_t frsize; 167 uint32_t padding; 168 uint32_t spare[6]; 169}; 170 171struct fuse_file_lock { 172 uint64_t start; 173 uint64_t end; 174 uint32_t type; 175 uint32_t pid; /* tgid */ 176}; 177 178/** 179 * Bitmasks for fuse_setattr_in.valid 180 */ 181#define FATTR_MODE (1 << 0) 182#define FATTR_UID (1 << 1) 183#define FATTR_GID (1 << 2) 184#define FATTR_SIZE (1 << 3) 185#define FATTR_ATIME (1 << 4) 186#define FATTR_MTIME (1 << 5) 187#define FATTR_FH (1 << 6) 188#define FATTR_ATIME_NOW (1 << 7) 189#define FATTR_MTIME_NOW (1 << 8) 190#define FATTR_LOCKOWNER (1 << 9) 191 192/** 193 * Flags returned by the OPEN request 194 * 195 * FOPEN_DIRECT_IO: bypass page cache for this open file 196 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open 197 * FOPEN_NONSEEKABLE: the file is not seekable 198 */ 199#define FOPEN_DIRECT_IO (1 << 0) 200#define FOPEN_KEEP_CACHE (1 << 1) 201#define FOPEN_NONSEEKABLE (1 << 2) 202 203/** 204 * INIT request/reply flags 205 * 206 * FUSE_ASYNC_READ: asynchronous read requests 207 * FUSE_POSIX_LOCKS: remote locking for POSIX file locks 208 * FUSE_FILE_OPS: kernel sends file handle for fstat, etc... (not yet supported) 209 * FUSE_ATOMIC_O_TRUNC: handles the O_TRUNC open flag in the filesystem 210 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".." 211 * FUSE_BIG_WRITES: filesystem can handle write size larger than 4kB 212 * FUSE_DONT_MASK: don't apply umask to file mode on create operations 213 * FUSE_SPLICE_WRITE: kernel supports splice write on the device 214 * FUSE_SPLICE_MOVE: kernel supports splice move on the device 215 * FUSE_SPLICE_READ: kernel supports splice read on the device 216 * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks 217 * FUSE_HAS_IOCTL_DIR: kernel supports ioctl on directories 218 * FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages 219 * FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one) 220 * FUSE_READDIRPLUS_AUTO: adaptive readdirplus 221 * FUSE_ASYNC_DIO: asynchronous direct I/O submission 222 */ 223#define FUSE_ASYNC_READ (1 << 0) 224#define FUSE_POSIX_LOCKS (1 << 1) 225#define FUSE_FILE_OPS (1 << 2) 226#define FUSE_ATOMIC_O_TRUNC (1 << 3) 227#define FUSE_EXPORT_SUPPORT (1 << 4) 228#define FUSE_BIG_WRITES (1 << 5) 229#define FUSE_DONT_MASK (1 << 6) 230#define FUSE_SPLICE_WRITE (1 << 7) 231#define FUSE_SPLICE_MOVE (1 << 8) 232#define FUSE_SPLICE_READ (1 << 9) 233#define FUSE_FLOCK_LOCKS (1 << 10) 234#define FUSE_HAS_IOCTL_DIR (1 << 11) 235#define FUSE_AUTO_INVAL_DATA (1 << 12) 236#define FUSE_DO_READDIRPLUS (1 << 13) 237#define FUSE_READDIRPLUS_AUTO (1 << 14) 238#define FUSE_ASYNC_DIO (1 << 15) 239 240/** 241 * CUSE INIT request/reply flags 242 * 243 * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl 244 */ 245#define CUSE_UNRESTRICTED_IOCTL (1 << 0) 246 247/** 248 * Release flags 249 */ 250#define FUSE_RELEASE_FLUSH (1 << 0) 251#define FUSE_RELEASE_FLOCK_UNLOCK (1 << 1) 252 253/** 254 * Getattr flags 255 */ 256#define FUSE_GETATTR_FH (1 << 0) 257 258/** 259 * Lock flags 260 */ 261#define FUSE_LK_FLOCK (1 << 0) 262 263/** 264 * WRITE flags 265 * 266 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed 267 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid 268 */ 269#define FUSE_WRITE_CACHE (1 << 0) 270#define FUSE_WRITE_LOCKOWNER (1 << 1) 271 272/** 273 * Read flags 274 */ 275#define FUSE_READ_LOCKOWNER (1 << 1) 276 277/** 278 * Ioctl flags 279 * 280 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine 281 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed 282 * FUSE_IOCTL_RETRY: retry with new iovecs 283 * FUSE_IOCTL_32BIT: 32bit ioctl 284 * FUSE_IOCTL_DIR: is a directory 285 * 286 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs 287 */ 288#define FUSE_IOCTL_COMPAT (1 << 0) 289#define FUSE_IOCTL_UNRESTRICTED (1 << 1) 290#define FUSE_IOCTL_RETRY (1 << 2) 291#define FUSE_IOCTL_32BIT (1 << 3) 292#define FUSE_IOCTL_DIR (1 << 4) 293 294#define FUSE_IOCTL_MAX_IOV 256 295 296/** 297 * Poll flags 298 * 299 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify 300 */ 301#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0) 302 303enum fuse_opcode { 304 FUSE_LOOKUP = 1, 305 FUSE_FORGET = 2, /* no reply */ 306 FUSE_GETATTR = 3, 307 FUSE_SETATTR = 4, 308 FUSE_READLINK = 5, 309 FUSE_SYMLINK = 6, 310 FUSE_MKNOD = 8, 311 FUSE_MKDIR = 9, 312 FUSE_UNLINK = 10, 313 FUSE_RMDIR = 11, 314 FUSE_RENAME = 12, 315 FUSE_LINK = 13, 316 FUSE_OPEN = 14, 317 FUSE_READ = 15, 318 FUSE_WRITE = 16, 319 FUSE_STATFS = 17, 320 FUSE_RELEASE = 18, 321 FUSE_FSYNC = 20, 322 FUSE_SETXATTR = 21, 323 FUSE_GETXATTR = 22, 324 FUSE_LISTXATTR = 23, 325 FUSE_REMOVEXATTR = 24, 326 FUSE_FLUSH = 25, 327 FUSE_INIT = 26, 328 FUSE_OPENDIR = 27, 329 FUSE_READDIR = 28, 330 FUSE_RELEASEDIR = 29, 331 FUSE_FSYNCDIR = 30, 332 FUSE_GETLK = 31, 333 FUSE_SETLK = 32, 334 FUSE_SETLKW = 33, 335 FUSE_ACCESS = 34, 336 FUSE_CREATE = 35, 337 FUSE_INTERRUPT = 36, 338 FUSE_BMAP = 37, 339 FUSE_DESTROY = 38, 340 FUSE_IOCTL = 39, 341 FUSE_POLL = 40, 342 FUSE_NOTIFY_REPLY = 41, 343 FUSE_BATCH_FORGET = 42, 344 FUSE_FALLOCATE = 43, 345 FUSE_READDIRPLUS = 44, 346 347 /* CUSE specific operations */ 348 CUSE_INIT = 4096, 349}; 350 351enum fuse_notify_code { 352 FUSE_NOTIFY_POLL = 1, 353 FUSE_NOTIFY_INVAL_INODE = 2, 354 FUSE_NOTIFY_INVAL_ENTRY = 3, 355 FUSE_NOTIFY_STORE = 4, 356 FUSE_NOTIFY_RETRIEVE = 5, 357 FUSE_NOTIFY_DELETE = 6, 358 FUSE_NOTIFY_CODE_MAX, 359}; 360 361/* The read buffer is required to be at least 8k, but may be much larger */ 362#define FUSE_MIN_READ_BUFFER 8192 363 364#define FUSE_COMPAT_ENTRY_OUT_SIZE 120 365 366struct fuse_entry_out { 367 uint64_t nodeid; /* Inode ID */ 368 uint64_t generation; /* Inode generation: nodeid:gen must 369 be unique for the fs's lifetime */ 370 uint64_t entry_valid; /* Cache timeout for the name */ 371 uint64_t attr_valid; /* Cache timeout for the attributes */ 372 uint32_t entry_valid_nsec; 373 uint32_t attr_valid_nsec; 374 struct fuse_attr attr; 375}; 376 377struct fuse_forget_in { 378 uint64_t nlookup; 379}; 380 381struct fuse_forget_one { 382 uint64_t nodeid; 383 uint64_t nlookup; 384}; 385 386struct fuse_batch_forget_in { 387 uint32_t count; 388 uint32_t dummy; 389}; 390 391struct fuse_getattr_in { 392 uint32_t getattr_flags; 393 uint32_t dummy; 394 uint64_t fh; 395}; 396 397#define FUSE_COMPAT_ATTR_OUT_SIZE 96 398 399struct fuse_attr_out { 400 uint64_t attr_valid; /* Cache timeout for the attributes */ 401 uint32_t attr_valid_nsec; 402 uint32_t dummy; 403 struct fuse_attr attr; 404}; 405 406#define FUSE_COMPAT_MKNOD_IN_SIZE 8 407 408struct fuse_mknod_in { 409 uint32_t mode; 410 uint32_t rdev; 411 uint32_t umask; 412 uint32_t padding; 413}; 414 415struct fuse_mkdir_in { 416 uint32_t mode; 417 uint32_t umask; 418}; 419 420struct fuse_rename_in { 421 uint64_t newdir; 422}; 423 424struct fuse_link_in { 425 uint64_t oldnodeid; 426}; 427 428struct fuse_setattr_in { 429 uint32_t valid; 430 uint32_t padding; 431 uint64_t fh; 432 uint64_t size; 433 uint64_t lock_owner; 434 uint64_t atime; 435 uint64_t mtime; 436 uint64_t unused2; 437 uint32_t atimensec; 438 uint32_t mtimensec; 439 uint32_t unused3; 440 uint32_t mode; 441 uint32_t unused4; 442 uint32_t uid; 443 uint32_t gid; 444 uint32_t unused5; 445}; 446 447struct fuse_open_in { 448 uint32_t flags; 449 uint32_t unused; 450}; 451 452struct fuse_create_in { 453 uint32_t flags; 454 uint32_t mode; 455 uint32_t umask; 456 uint32_t padding; 457}; 458 459struct fuse_open_out { 460 uint64_t fh; 461 uint32_t open_flags; 462 uint32_t padding; 463}; 464 465struct fuse_release_in { 466 uint64_t fh; 467 uint32_t flags; 468 uint32_t release_flags; 469 uint64_t lock_owner; 470}; 471 472struct fuse_flush_in { 473 uint64_t fh; 474 uint32_t unused; 475 uint32_t padding; 476 uint64_t lock_owner; 477}; 478 479struct fuse_read_in { 480 uint64_t fh; 481 uint64_t offset; 482 uint32_t size; 483 uint32_t read_flags; 484 uint64_t lock_owner; 485 uint32_t flags; 486 uint32_t padding; 487}; 488 489#define FUSE_COMPAT_WRITE_IN_SIZE 24 490 491struct fuse_write_in { 492 uint64_t fh; 493 uint64_t offset; 494 uint32_t size; 495 uint32_t write_flags; 496 uint64_t lock_owner; 497 uint32_t flags; 498 uint32_t padding; 499}; 500 501struct fuse_write_out { 502 uint32_t size; 503 uint32_t padding; 504}; 505 506#define FUSE_COMPAT_STATFS_SIZE 48 507 508struct fuse_statfs_out { 509 struct fuse_kstatfs st; 510}; 511 512struct fuse_fsync_in { 513 uint64_t fh; 514 uint32_t fsync_flags; 515 uint32_t padding; 516}; 517 518struct fuse_setxattr_in { 519 uint32_t size; 520 uint32_t flags; 521}; 522 523struct fuse_getxattr_in { 524 uint32_t size; 525 uint32_t padding; 526}; 527 528struct fuse_getxattr_out { 529 uint32_t size; 530 uint32_t padding; 531}; 532 533struct fuse_lk_in { 534 uint64_t fh; 535 uint64_t owner; 536 struct fuse_file_lock lk; 537 uint32_t lk_flags; 538 uint32_t padding; 539}; 540 541struct fuse_lk_out { 542 struct fuse_file_lock lk; 543}; 544 545struct fuse_access_in { 546 uint32_t mask; 547 uint32_t padding; 548}; 549 550struct fuse_init_in { 551 uint32_t major; 552 uint32_t minor; 553 uint32_t max_readahead; 554 uint32_t flags; 555}; 556 557struct fuse_init_out { 558 uint32_t major; 559 uint32_t minor; 560 uint32_t max_readahead; 561 uint32_t flags; 562 uint16_t max_background; 563 uint16_t congestion_threshold; 564 uint32_t max_write; 565}; 566 567#define CUSE_INIT_INFO_MAX 4096 568 569struct cuse_init_in { 570 uint32_t major; 571 uint32_t minor; 572 uint32_t unused; 573 uint32_t flags; 574}; 575 576struct cuse_init_out { 577 uint32_t major; 578 uint32_t minor; 579 uint32_t unused; 580 uint32_t flags; 581 uint32_t max_read; 582 uint32_t max_write; 583 uint32_t dev_major; /* chardev major */ 584 uint32_t dev_minor; /* chardev minor */ 585 uint32_t spare[10]; 586}; 587 588struct fuse_interrupt_in { 589 uint64_t unique; 590}; 591 592struct fuse_bmap_in { 593 uint64_t block; 594 uint32_t blocksize; 595 uint32_t padding; 596}; 597 598struct fuse_bmap_out { 599 uint64_t block; 600}; 601 602struct fuse_ioctl_in { 603 uint64_t fh; 604 uint32_t flags; 605 uint32_t cmd; 606 uint64_t arg; 607 uint32_t in_size; 608 uint32_t out_size; 609}; 610 611struct fuse_ioctl_iovec { 612 uint64_t base; 613 uint64_t len; 614}; 615 616struct fuse_ioctl_out { 617 int32_t result; 618 uint32_t flags; 619 uint32_t in_iovs; 620 uint32_t out_iovs; 621}; 622 623struct fuse_poll_in { 624 uint64_t fh; 625 uint64_t kh; 626 uint32_t flags; 627 uint32_t events; 628}; 629 630struct fuse_poll_out { 631 uint32_t revents; 632 uint32_t padding; 633}; 634 635struct fuse_notify_poll_wakeup_out { 636 uint64_t kh; 637}; 638 639struct fuse_fallocate_in { 640 uint64_t fh; 641 uint64_t offset; 642 uint64_t length; 643 uint32_t mode; 644 uint32_t padding; 645}; 646 647struct fuse_in_header { 648 uint32_t len; 649 uint32_t opcode; 650 uint64_t unique; 651 uint64_t nodeid; 652 uint32_t uid; 653 uint32_t gid; 654 uint32_t pid; 655 uint32_t padding; 656}; 657 658struct fuse_out_header { 659 uint32_t len; 660 int32_t error; 661 uint64_t unique; 662}; 663 664struct fuse_dirent { 665 uint64_t ino; 666 uint64_t off; 667 uint32_t namelen; 668 uint32_t type; 669 char name[]; 670}; 671 672#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name) 673#define FUSE_DIRENT_ALIGN(x) \ 674 (((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1)) 675#define FUSE_DIRENT_SIZE(d) \ 676 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen) 677 678struct fuse_direntplus { 679 struct fuse_entry_out entry_out; 680 struct fuse_dirent dirent; 681}; 682 683#define FUSE_NAME_OFFSET_DIRENTPLUS \ 684 offsetof(struct fuse_direntplus, dirent.name) 685#define FUSE_DIRENTPLUS_SIZE(d) \ 686 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET_DIRENTPLUS + (d)->dirent.namelen) 687 688struct fuse_notify_inval_inode_out { 689 uint64_t ino; 690 int64_t off; 691 int64_t len; 692}; 693 694struct fuse_notify_inval_entry_out { 695 uint64_t parent; 696 uint32_t namelen; 697 uint32_t padding; 698}; 699 700struct fuse_notify_delete_out { 701 uint64_t parent; 702 uint64_t child; 703 uint32_t namelen; 704 uint32_t padding; 705}; 706 707struct fuse_notify_store_out { 708 uint64_t nodeid; 709 uint64_t offset; 710 uint32_t size; 711 uint32_t padding; 712}; 713 714struct fuse_notify_retrieve_out { 715 uint64_t notify_unique; 716 uint64_t nodeid; 717 uint64_t offset; 718 uint32_t size; 719 uint32_t padding; 720}; 721 722/* Matches the size of fuse_write_in */ 723struct fuse_notify_retrieve_in { 724 uint64_t dummy1; 725 uint64_t offset; 726 uint32_t size; 727 uint32_t dummy2; 728 uint64_t dummy3; 729 uint64_t dummy4; 730}; 731 732#endif /* _LINUX_FUSE_H */ 733