libfuse
fuse_kernel.h
1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
2 /*
3  This file defines the kernel interface of FUSE
4  Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
5 
6  This program can be distributed under the terms of the GNU GPL.
7  See the file COPYING.
8 
9  This -- and only this -- header file may also be distributed under
10  the terms of the BSD Licence as follows:
11 
12  Copyright (C) 2001-2007 Miklos Szeredi. All rights reserved.
13 
14  Redistribution and use in source and binary forms, with or without
15  modification, are permitted provided that the following conditions
16  are met:
17  1. Redistributions of source code must retain the above copyright
18  notice, this list of conditions and the following disclaimer.
19  2. Redistributions in binary form must reproduce the above copyright
20  notice, this list of conditions and the following disclaimer in the
21  documentation and/or other materials provided with the distribution.
22 
23  THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
27  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  SUCH DAMAGE.
34 */
35 
36 /*
37  * This file defines the kernel interface of FUSE
38  *
39  * Protocol changelog:
40  *
41  * 7.1:
42  * - add the following messages:
43  * FUSE_SETATTR, FUSE_SYMLINK, FUSE_MKNOD, FUSE_MKDIR, FUSE_UNLINK,
44  * FUSE_RMDIR, FUSE_RENAME, FUSE_LINK, FUSE_OPEN, FUSE_READ, FUSE_WRITE,
45  * FUSE_RELEASE, FUSE_FSYNC, FUSE_FLUSH, FUSE_SETXATTR, FUSE_GETXATTR,
46  * FUSE_LISTXATTR, FUSE_REMOVEXATTR, FUSE_OPENDIR, FUSE_READDIR,
47  * FUSE_RELEASEDIR
48  * - add padding to messages to accommodate 32-bit servers on 64-bit kernels
49  *
50  * 7.2:
51  * - add FOPEN_DIRECT_IO and FOPEN_KEEP_CACHE flags
52  * - add FUSE_FSYNCDIR message
53  *
54  * 7.3:
55  * - add FUSE_ACCESS message
56  * - add FUSE_CREATE message
57  * - add filehandle to fuse_setattr_in
58  *
59  * 7.4:
60  * - add frsize to fuse_kstatfs
61  * - clean up request size limit checking
62  *
63  * 7.5:
64  * - add flags and max_write to fuse_init_out
65  *
66  * 7.6:
67  * - add max_readahead to fuse_init_in and fuse_init_out
68  *
69  * 7.7:
70  * - add FUSE_INTERRUPT message
71  * - add POSIX file lock support
72  *
73  * 7.8:
74  * - add lock_owner and flags fields to fuse_release_in
75  * - add FUSE_BMAP message
76  * - add FUSE_DESTROY message
77  *
78  * 7.9:
79  * - new fuse_getattr_in input argument of GETATTR
80  * - add lk_flags in fuse_lk_in
81  * - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
82  * - add blksize field to fuse_attr
83  * - add file flags field to fuse_read_in and fuse_write_in
84  * - Add ATIME_NOW and MTIME_NOW flags to fuse_setattr_in
85  *
86  * 7.10
87  * - add nonseekable open flag
88  *
89  * 7.11
90  * - add IOCTL message
91  * - add unsolicited notification support
92  * - add POLL message and NOTIFY_POLL notification
93  *
94  * 7.12
95  * - add umask flag to input argument of create, mknod and mkdir
96  * - add notification messages for invalidation of inodes and
97  * directory entries
98  *
99  * 7.13
100  * - make max number of background requests and congestion threshold
101  * tunables
102  *
103  * 7.14
104  * - add splice support to fuse device
105  *
106  * 7.15
107  * - add store notify
108  * - add retrieve notify
109  *
110  * 7.16
111  * - add BATCH_FORGET request
112  * - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct
113  * fuse_ioctl_iovec' instead of ambiguous 'struct iovec'
114  * - add FUSE_IOCTL_32BIT flag
115  *
116  * 7.17
117  * - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
118  *
119  * 7.18
120  * - add FUSE_IOCTL_DIR flag
121  * - add FUSE_NOTIFY_DELETE
122  *
123  * 7.19
124  * - add FUSE_FALLOCATE
125  *
126  * 7.20
127  * - add FUSE_AUTO_INVAL_DATA
128  *
129  * 7.21
130  * - add FUSE_READDIRPLUS
131  * - send the requested events in POLL request
132  *
133  * 7.22
134  * - add FUSE_ASYNC_DIO
135  *
136  * 7.23
137  * - add FUSE_WRITEBACK_CACHE
138  * - add time_gran to fuse_init_out
139  * - add reserved space to fuse_init_out
140  * - add FATTR_CTIME
141  * - add ctime and ctimensec to fuse_setattr_in
142  * - add FUSE_RENAME2 request
143  * - add FUSE_NO_OPEN_SUPPORT flag
144  *
145  * 7.24
146  * - add FUSE_LSEEK for SEEK_HOLE and SEEK_DATA support
147  *
148  * 7.25
149  * - add FUSE_PARALLEL_DIROPS
150  *
151  * 7.26
152  * - add FUSE_HANDLE_KILLPRIV
153  * - add FUSE_POSIX_ACL
154  *
155  * 7.27
156  * - add FUSE_ABORT_ERROR
157  *
158  * 7.28
159  * - add FUSE_COPY_FILE_RANGE
160  * - add FOPEN_CACHE_DIR
161  * - add FUSE_MAX_PAGES, add max_pages to init_out
162  * - add FUSE_CACHE_SYMLINKS
163  *
164  * 7.29
165  * - add FUSE_NO_OPENDIR_SUPPORT flag
166  *
167  * 7.30
168  * - add FUSE_EXPLICIT_INVAL_DATA
169  * - add FUSE_IOCTL_COMPAT_X32
170  *
171  * 7.31
172  * - add FUSE_WRITE_KILL_PRIV flag
173  * - add FUSE_SETUPMAPPING and FUSE_REMOVEMAPPING
174  * - add map_alignment to fuse_init_out, add FUSE_MAP_ALIGNMENT flag
175  *
176  * 7.32
177  * - add flags to fuse_attr, add FUSE_ATTR_SUBMOUNT, add FUSE_SUBMOUNTS
178  *
179  * 7.33
180  * - add FUSE_HANDLE_KILLPRIV_V2, FUSE_WRITE_KILL_SUIDGID, FATTR_KILL_SUIDGID
181  * - add FUSE_OPEN_KILL_SUIDGID
182  * - extend fuse_setxattr_in, add FUSE_SETXATTR_EXT
183  * - add FUSE_SETXATTR_ACL_KILL_SGID
184  *
185  * 7.34
186  * - add FUSE_SYNCFS
187  *
188  * 7.35
189  * - add FOPEN_NOFLUSH
190  *
191  * 7.36
192  * - extend fuse_init_in with reserved fields, add FUSE_INIT_EXT init flag
193  * - add flags2 to fuse_init_in and fuse_init_out
194  * - add FUSE_SECURITY_CTX init flag
195  * - add security context to create, mkdir, symlink, and mknod requests
196  * - add FUSE_HAS_INODE_DAX, FUSE_ATTR_DAX
197  *
198  * 7.37
199  * - add FUSE_TMPFILE
200  *
201  * 7.38
202  * - add FUSE_EXPIRE_ONLY flag to fuse_notify_inval_entry
203  */
204 
205 #ifndef _LINUX_FUSE_H
206 #define _LINUX_FUSE_H
207 
208 #ifdef __KERNEL__
209 #include <linux/types.h>
210 #else
211 #include <stdint.h>
212 #endif
213 
214 /*
215  * Version negotiation:
216  *
217  * Both the kernel and userspace send the version they support in the
218  * INIT request and reply respectively.
219  *
220  * If the major versions match then both shall use the smallest
221  * of the two minor versions for communication.
222  *
223  * If the kernel supports a larger major version, then userspace shall
224  * reply with the major version it supports, ignore the rest of the
225  * INIT message and expect a new INIT message from the kernel with a
226  * matching major version.
227  *
228  * If the library supports a larger major version, then it shall fall
229  * back to the major protocol version sent by the kernel for
230  * communication and reply with that major version (and an arbitrary
231  * supported minor version).
232  */
233 
235 #define FUSE_KERNEL_VERSION 7
236 
238 #define FUSE_KERNEL_MINOR_VERSION 38
239 
241 #define FUSE_ROOT_ID 1
242 
243 /* Make sure all structures are padded to 64bit boundary, so 32bit
244  userspace works under 64bit kernels */
245 
246 struct fuse_attr {
247  uint64_t ino;
248  uint64_t size;
249  uint64_t blocks;
250  uint64_t atime;
251  uint64_t mtime;
252  uint64_t ctime;
253  uint32_t atimensec;
254  uint32_t mtimensec;
255  uint32_t ctimensec;
256  uint32_t mode;
257  uint32_t nlink;
258  uint32_t uid;
259  uint32_t gid;
260  uint32_t rdev;
261  uint32_t blksize;
262  uint32_t flags;
263 };
264 
265 struct fuse_kstatfs {
266  uint64_t blocks;
267  uint64_t bfree;
268  uint64_t bavail;
269  uint64_t files;
270  uint64_t ffree;
271  uint32_t bsize;
272  uint32_t namelen;
273  uint32_t frsize;
274  uint32_t padding;
275  uint32_t spare[6];
276 };
277 
278 struct fuse_file_lock {
279  uint64_t start;
280  uint64_t end;
281  uint32_t type;
282  uint32_t pid; /* tgid */
283 };
284 
288 #define FATTR_MODE (1 << 0)
289 #define FATTR_UID (1 << 1)
290 #define FATTR_GID (1 << 2)
291 #define FATTR_SIZE (1 << 3)
292 #define FATTR_ATIME (1 << 4)
293 #define FATTR_MTIME (1 << 5)
294 #define FATTR_FH (1 << 6)
295 #define FATTR_ATIME_NOW (1 << 7)
296 #define FATTR_MTIME_NOW (1 << 8)
297 #define FATTR_LOCKOWNER (1 << 9)
298 #define FATTR_CTIME (1 << 10)
299 #define FATTR_KILL_SUIDGID (1 << 11)
300 
311 #define FOPEN_DIRECT_IO (1 << 0)
312 #define FOPEN_KEEP_CACHE (1 << 1)
313 #define FOPEN_NONSEEKABLE (1 << 2)
314 #define FOPEN_CACHE_DIR (1 << 3)
315 #define FOPEN_STREAM (1 << 4)
316 #define FOPEN_NOFLUSH (1 << 5)
317 
363 #define FUSE_ASYNC_READ (1 << 0)
364 #define FUSE_POSIX_LOCKS (1 << 1)
365 #define FUSE_FILE_OPS (1 << 2)
366 #define FUSE_ATOMIC_O_TRUNC (1 << 3)
367 #define FUSE_EXPORT_SUPPORT (1 << 4)
368 #define FUSE_BIG_WRITES (1 << 5)
369 #define FUSE_DONT_MASK (1 << 6)
370 #define FUSE_SPLICE_WRITE (1 << 7)
371 #define FUSE_SPLICE_MOVE (1 << 8)
372 #define FUSE_SPLICE_READ (1 << 9)
373 #define FUSE_FLOCK_LOCKS (1 << 10)
374 #define FUSE_HAS_IOCTL_DIR (1 << 11)
375 #define FUSE_AUTO_INVAL_DATA (1 << 12)
376 #define FUSE_DO_READDIRPLUS (1 << 13)
377 #define FUSE_READDIRPLUS_AUTO (1 << 14)
378 #define FUSE_ASYNC_DIO (1 << 15)
379 #define FUSE_WRITEBACK_CACHE (1 << 16)
380 #define FUSE_NO_OPEN_SUPPORT (1 << 17)
381 #define FUSE_PARALLEL_DIROPS (1 << 18)
382 #define FUSE_HANDLE_KILLPRIV (1 << 19)
383 #define FUSE_POSIX_ACL (1 << 20)
384 #define FUSE_ABORT_ERROR (1 << 21)
385 #define FUSE_MAX_PAGES (1 << 22)
386 #define FUSE_CACHE_SYMLINKS (1 << 23)
387 #define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
388 #define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
389 #define FUSE_MAP_ALIGNMENT (1 << 26)
390 #define FUSE_SUBMOUNTS (1 << 27)
391 #define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
392 #define FUSE_SETXATTR_EXT (1 << 29)
393 #define FUSE_INIT_EXT (1 << 30)
394 #define FUSE_INIT_RESERVED (1 << 31)
395 /* bits 32..63 get shifted down 32 bits into the flags2 field */
396 #define FUSE_SECURITY_CTX (1ULL << 32)
397 #define FUSE_HAS_INODE_DAX (1ULL << 33)
398 
404 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
405 
409 #define FUSE_RELEASE_FLUSH (1 << 0)
410 #define FUSE_RELEASE_FLOCK_UNLOCK (1 << 1)
411 
415 #define FUSE_GETATTR_FH (1 << 0)
416 
420 #define FUSE_LK_FLOCK (1 << 0)
421 
429 #define FUSE_WRITE_CACHE (1 << 0)
430 #define FUSE_WRITE_LOCKOWNER (1 << 1)
431 #define FUSE_WRITE_KILL_SUIDGID (1 << 2)
432 
433 /* Obsolete alias; this flag implies killing suid/sgid only. */
434 #define FUSE_WRITE_KILL_PRIV FUSE_WRITE_KILL_SUIDGID
435 
439 #define FUSE_READ_LOCKOWNER (1 << 1)
440 
453 #define FUSE_IOCTL_COMPAT (1 << 0)
454 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
455 #define FUSE_IOCTL_RETRY (1 << 2)
456 #define FUSE_IOCTL_32BIT (1 << 3)
457 #define FUSE_IOCTL_DIR (1 << 4)
458 #define FUSE_IOCTL_COMPAT_X32 (1 << 5)
459 
460 #define FUSE_IOCTL_MAX_IOV 256
461 
467 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
468 
474 #define FUSE_FSYNC_FDATASYNC (1 << 0)
475 
482 #define FUSE_ATTR_SUBMOUNT (1 << 0)
483 #define FUSE_ATTR_DAX (1 << 1)
484 
489 #define FUSE_OPEN_KILL_SUIDGID (1 << 0)
490 
495 #define FUSE_SETXATTR_ACL_KILL_SGID (1 << 0)
496 
501 #define FUSE_EXPIRE_ONLY (1 << 0)
502 
503 enum fuse_opcode {
504  FUSE_LOOKUP = 1,
505  FUSE_FORGET = 2, /* no reply */
506  FUSE_GETATTR = 3,
507  FUSE_SETATTR = 4,
508  FUSE_READLINK = 5,
509  FUSE_SYMLINK = 6,
510  FUSE_MKNOD = 8,
511  FUSE_MKDIR = 9,
512  FUSE_UNLINK = 10,
513  FUSE_RMDIR = 11,
514  FUSE_RENAME = 12,
515  FUSE_LINK = 13,
516  FUSE_OPEN = 14,
517  FUSE_READ = 15,
518  FUSE_WRITE = 16,
519  FUSE_STATFS = 17,
520  FUSE_RELEASE = 18,
521  FUSE_FSYNC = 20,
522  FUSE_SETXATTR = 21,
523  FUSE_GETXATTR = 22,
524  FUSE_LISTXATTR = 23,
525  FUSE_REMOVEXATTR = 24,
526  FUSE_FLUSH = 25,
527  FUSE_INIT = 26,
528  FUSE_OPENDIR = 27,
529  FUSE_READDIR = 28,
530  FUSE_RELEASEDIR = 29,
531  FUSE_FSYNCDIR = 30,
532  FUSE_GETLK = 31,
533  FUSE_SETLK = 32,
534  FUSE_SETLKW = 33,
535  FUSE_ACCESS = 34,
536  FUSE_CREATE = 35,
537  FUSE_INTERRUPT = 36,
538  FUSE_BMAP = 37,
539  FUSE_DESTROY = 38,
540  FUSE_IOCTL = 39,
541  FUSE_POLL = 40,
542  FUSE_NOTIFY_REPLY = 41,
543  FUSE_BATCH_FORGET = 42,
544  FUSE_FALLOCATE = 43,
545  FUSE_READDIRPLUS = 44,
546  FUSE_RENAME2 = 45,
547  FUSE_LSEEK = 46,
548  FUSE_COPY_FILE_RANGE = 47,
549  FUSE_SETUPMAPPING = 48,
550  FUSE_REMOVEMAPPING = 49,
551  FUSE_SYNCFS = 50,
552  FUSE_TMPFILE = 51,
553 
554  /* CUSE specific operations */
555  CUSE_INIT = 4096,
556 
557  /* Reserved opcodes: helpful to detect structure endian-ness */
558  CUSE_INIT_BSWAP_RESERVED = 1048576, /* CUSE_INIT << 8 */
559  FUSE_INIT_BSWAP_RESERVED = 436207616, /* FUSE_INIT << 24 */
560 };
561 
562 enum fuse_notify_code {
563  FUSE_NOTIFY_POLL = 1,
564  FUSE_NOTIFY_INVAL_INODE = 2,
565  FUSE_NOTIFY_INVAL_ENTRY = 3,
566  FUSE_NOTIFY_STORE = 4,
567  FUSE_NOTIFY_RETRIEVE = 5,
568  FUSE_NOTIFY_DELETE = 6,
569  FUSE_NOTIFY_CODE_MAX,
570 };
571 
572 /* The read buffer is required to be at least 8k, but may be much larger */
573 #define FUSE_MIN_READ_BUFFER 8192
574 
575 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
576 
577 struct fuse_entry_out {
578  uint64_t nodeid; /* Inode ID */
579  uint64_t generation; /* Inode generation: nodeid:gen must
580  be unique for the fs's lifetime */
581  uint64_t entry_valid; /* Cache timeout for the name */
582  uint64_t attr_valid; /* Cache timeout for the attributes */
583  uint32_t entry_valid_nsec;
584  uint32_t attr_valid_nsec;
585  struct fuse_attr attr;
586 };
587 
588 struct fuse_forget_in {
589  uint64_t nlookup;
590 };
591 
592 struct fuse_forget_one {
593  uint64_t nodeid;
594  uint64_t nlookup;
595 };
596 
597 struct fuse_batch_forget_in {
598  uint32_t count;
599  uint32_t dummy;
600 };
601 
602 struct fuse_getattr_in {
603  uint32_t getattr_flags;
604  uint32_t dummy;
605  uint64_t fh;
606 };
607 
608 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
609 
610 struct fuse_attr_out {
611  uint64_t attr_valid; /* Cache timeout for the attributes */
612  uint32_t attr_valid_nsec;
613  uint32_t dummy;
614  struct fuse_attr attr;
615 };
616 
617 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
618 
619 struct fuse_mknod_in {
620  uint32_t mode;
621  uint32_t rdev;
622  uint32_t umask;
623  uint32_t padding;
624 };
625 
626 struct fuse_mkdir_in {
627  uint32_t mode;
628  uint32_t umask;
629 };
630 
631 struct fuse_rename_in {
632  uint64_t newdir;
633 };
634 
635 struct fuse_rename2_in {
636  uint64_t newdir;
637  uint32_t flags;
638  uint32_t padding;
639 };
640 
641 struct fuse_link_in {
642  uint64_t oldnodeid;
643 };
644 
645 struct fuse_setattr_in {
646  uint32_t valid;
647  uint32_t padding;
648  uint64_t fh;
649  uint64_t size;
650  uint64_t lock_owner;
651  uint64_t atime;
652  uint64_t mtime;
653  uint64_t ctime;
654  uint32_t atimensec;
655  uint32_t mtimensec;
656  uint32_t ctimensec;
657  uint32_t mode;
658  uint32_t unused4;
659  uint32_t uid;
660  uint32_t gid;
661  uint32_t unused5;
662 };
663 
664 struct fuse_open_in {
665  uint32_t flags;
666  uint32_t open_flags; /* FUSE_OPEN_... */
667 };
668 
669 struct fuse_create_in {
670  uint32_t flags;
671  uint32_t mode;
672  uint32_t umask;
673  uint32_t open_flags; /* FUSE_OPEN_... */
674 };
675 
676 struct fuse_open_out {
677  uint64_t fh;
678  uint32_t open_flags;
679  uint32_t padding;
680 };
681 
682 struct fuse_release_in {
683  uint64_t fh;
684  uint32_t flags;
685  uint32_t release_flags;
686  uint64_t lock_owner;
687 };
688 
689 struct fuse_flush_in {
690  uint64_t fh;
691  uint32_t unused;
692  uint32_t padding;
693  uint64_t lock_owner;
694 };
695 
696 struct fuse_read_in {
697  uint64_t fh;
698  uint64_t offset;
699  uint32_t size;
700  uint32_t read_flags;
701  uint64_t lock_owner;
702  uint32_t flags;
703  uint32_t padding;
704 };
705 
706 #define FUSE_COMPAT_WRITE_IN_SIZE 24
707 
708 struct fuse_write_in {
709  uint64_t fh;
710  uint64_t offset;
711  uint32_t size;
712  uint32_t write_flags;
713  uint64_t lock_owner;
714  uint32_t flags;
715  uint32_t padding;
716 };
717 
718 struct fuse_write_out {
719  uint32_t size;
720  uint32_t padding;
721 };
722 
723 #define FUSE_COMPAT_STATFS_SIZE 48
724 
725 struct fuse_statfs_out {
726  struct fuse_kstatfs st;
727 };
728 
729 struct fuse_fsync_in {
730  uint64_t fh;
731  uint32_t fsync_flags;
732  uint32_t padding;
733 };
734 
735 #define FUSE_COMPAT_SETXATTR_IN_SIZE 8
736 
737 struct fuse_setxattr_in {
738  uint32_t size;
739  uint32_t flags;
740  uint32_t setxattr_flags;
741  uint32_t padding;
742 };
743 
744 struct fuse_getxattr_in {
745  uint32_t size;
746  uint32_t padding;
747 };
748 
749 struct fuse_getxattr_out {
750  uint32_t size;
751  uint32_t padding;
752 };
753 
754 struct fuse_lk_in {
755  uint64_t fh;
756  uint64_t owner;
757  struct fuse_file_lock lk;
758  uint32_t lk_flags;
759  uint32_t padding;
760 };
761 
762 struct fuse_lk_out {
763  struct fuse_file_lock lk;
764 };
765 
766 struct fuse_access_in {
767  uint32_t mask;
768  uint32_t padding;
769 };
770 
771 struct fuse_init_in {
772  uint32_t major;
773  uint32_t minor;
774  uint32_t max_readahead;
775  uint32_t flags;
776  uint32_t flags2;
777  uint32_t unused[11];
778 };
779 
780 #define FUSE_COMPAT_INIT_OUT_SIZE 8
781 #define FUSE_COMPAT_22_INIT_OUT_SIZE 24
782 
783 struct fuse_init_out {
784  uint32_t major;
785  uint32_t minor;
786  uint32_t max_readahead;
787  uint32_t flags;
788  uint16_t max_background;
789  uint16_t congestion_threshold;
790  uint32_t max_write;
791  uint32_t time_gran;
792  uint16_t max_pages;
793  uint16_t map_alignment;
794  uint32_t flags2;
795  uint32_t unused[7];
796 };
797 
798 #define CUSE_INIT_INFO_MAX 4096
799 
800 struct cuse_init_in {
801  uint32_t major;
802  uint32_t minor;
803  uint32_t unused;
804  uint32_t flags;
805 };
806 
807 struct cuse_init_out {
808  uint32_t major;
809  uint32_t minor;
810  uint32_t unused;
811  uint32_t flags;
812  uint32_t max_read;
813  uint32_t max_write;
814  uint32_t dev_major; /* chardev major */
815  uint32_t dev_minor; /* chardev minor */
816  uint32_t spare[10];
817 };
818 
819 struct fuse_interrupt_in {
820  uint64_t unique;
821 };
822 
823 struct fuse_bmap_in {
824  uint64_t block;
825  uint32_t blocksize;
826  uint32_t padding;
827 };
828 
829 struct fuse_bmap_out {
830  uint64_t block;
831 };
832 
833 struct fuse_ioctl_in {
834  uint64_t fh;
835  uint32_t flags;
836  uint32_t cmd;
837  uint64_t arg;
838  uint32_t in_size;
839  uint32_t out_size;
840 };
841 
842 struct fuse_ioctl_iovec {
843  uint64_t base;
844  uint64_t len;
845 };
846 
847 struct fuse_ioctl_out {
848  int32_t result;
849  uint32_t flags;
850  uint32_t in_iovs;
851  uint32_t out_iovs;
852 };
853 
854 struct fuse_poll_in {
855  uint64_t fh;
856  uint64_t kh;
857  uint32_t flags;
858  uint32_t events;
859 };
860 
861 struct fuse_poll_out {
862  uint32_t revents;
863  uint32_t padding;
864 };
865 
866 struct fuse_notify_poll_wakeup_out {
867  uint64_t kh;
868 };
869 
870 struct fuse_fallocate_in {
871  uint64_t fh;
872  uint64_t offset;
873  uint64_t length;
874  uint32_t mode;
875  uint32_t padding;
876 };
877 
878 struct fuse_in_header {
879  uint32_t len;
880  uint32_t opcode;
881  uint64_t unique;
882  uint64_t nodeid;
883  uint32_t uid;
884  uint32_t gid;
885  uint32_t pid;
886  uint32_t padding;
887 };
888 
889 struct fuse_out_header {
890  uint32_t len;
891  int32_t error;
892  uint64_t unique;
893 };
894 
895 struct fuse_dirent {
896  uint64_t ino;
897  uint64_t off;
898  uint32_t namelen;
899  uint32_t type;
900  char name[];
901 };
902 
903 /* Align variable length records to 64bit boundary */
904 #define FUSE_REC_ALIGN(x) \
905  (((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
906 
907 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
908 #define FUSE_DIRENT_ALIGN(x) FUSE_REC_ALIGN(x)
909 #define FUSE_DIRENT_SIZE(d) \
910  FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
911 
912 struct fuse_direntplus {
913  struct fuse_entry_out entry_out;
914  struct fuse_dirent dirent;
915 };
916 
917 #define FUSE_NAME_OFFSET_DIRENTPLUS \
918  offsetof(struct fuse_direntplus, dirent.name)
919 #define FUSE_DIRENTPLUS_SIZE(d) \
920  FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET_DIRENTPLUS + (d)->dirent.namelen)
921 
922 struct fuse_notify_inval_inode_out {
923  uint64_t ino;
924  int64_t off;
925  int64_t len;
926 };
927 
928 struct fuse_notify_inval_entry_out {
929  uint64_t parent;
930  uint32_t namelen;
931  uint32_t flags;
932 };
933 
934 struct fuse_notify_delete_out {
935  uint64_t parent;
936  uint64_t child;
937  uint32_t namelen;
938  uint32_t padding;
939 };
940 
941 struct fuse_notify_store_out {
942  uint64_t nodeid;
943  uint64_t offset;
944  uint32_t size;
945  uint32_t padding;
946 };
947 
948 struct fuse_notify_retrieve_out {
949  uint64_t notify_unique;
950  uint64_t nodeid;
951  uint64_t offset;
952  uint32_t size;
953  uint32_t padding;
954 };
955 
956 /* Matches the size of fuse_write_in */
957 struct fuse_notify_retrieve_in {
958  uint64_t dummy1;
959  uint64_t offset;
960  uint32_t size;
961  uint32_t dummy2;
962  uint64_t dummy3;
963  uint64_t dummy4;
964 };
965 
966 /* Device ioctls: */
967 #define FUSE_DEV_IOC_MAGIC 229
968 #define FUSE_DEV_IOC_CLONE _IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)
969 
970 struct fuse_lseek_in {
971  uint64_t fh;
972  uint64_t offset;
973  uint32_t whence;
974  uint32_t padding;
975 };
976 
977 struct fuse_lseek_out {
978  uint64_t offset;
979 };
980 
981 struct fuse_copy_file_range_in {
982  uint64_t fh_in;
983  uint64_t off_in;
984  uint64_t nodeid_out;
985  uint64_t fh_out;
986  uint64_t off_out;
987  uint64_t len;
988  uint64_t flags;
989 };
990 
991 #define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
992 #define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
993 struct fuse_setupmapping_in {
994  /* An already open handle */
995  uint64_t fh;
996  /* Offset into the file to start the mapping */
997  uint64_t foffset;
998  /* Length of mapping required */
999  uint64_t len;
1000  /* Flags, FUSE_SETUPMAPPING_FLAG_* */
1001  uint64_t flags;
1002  /* Offset in Memory Window */
1003  uint64_t moffset;
1004 };
1005 
1006 struct fuse_removemapping_in {
1007  /* number of fuse_removemapping_one follows */
1008  uint32_t count;
1009 };
1010 
1011 struct fuse_removemapping_one {
1012  /* Offset into the dax window start the unmapping */
1013  uint64_t moffset;
1014  /* Length of mapping required */
1015  uint64_t len;
1016 };
1017 
1018 #define FUSE_REMOVEMAPPING_MAX_ENTRY \
1019  (PAGE_SIZE / sizeof(struct fuse_removemapping_one))
1020 
1021 struct fuse_syncfs_in {
1022  uint64_t padding;
1023 };
1024 
1025 /*
1026  * For each security context, send fuse_secctx with size of security context
1027  * fuse_secctx will be followed by security context name and this in turn
1028  * will be followed by actual context label.
1029  * fuse_secctx, name, context
1030  */
1031 struct fuse_secctx {
1032  uint32_t size;
1033  uint32_t padding;
1034 };
1035 
1036 /*
1037  * Contains the information about how many fuse_secctx structures are being
1038  * sent and what's the total size of all security contexts (including
1039  * size of fuse_secctx_header).
1040  *
1041  */
1042 struct fuse_secctx_header {
1043  uint32_t size;
1044  uint32_t nr_secctx;
1045 };
1046 
1047 #endif /* _LINUX_FUSE_H */