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 
199 #ifndef _LINUX_FUSE_H
200 #define _LINUX_FUSE_H
201 
202 #ifdef __KERNEL__
203 #include <linux/types.h>
204 #else
205 #include <stdint.h>
206 #endif
207 
208 /*
209  * Version negotiation:
210  *
211  * Both the kernel and userspace send the version they support in the
212  * INIT request and reply respectively.
213  *
214  * If the major versions match then both shall use the smallest
215  * of the two minor versions for communication.
216  *
217  * If the kernel supports a larger major version, then userspace shall
218  * reply with the major version it supports, ignore the rest of the
219  * INIT message and expect a new INIT message from the kernel with a
220  * matching major version.
221  *
222  * If the library supports a larger major version, then it shall fall
223  * back to the major protocol version sent by the kernel for
224  * communication and reply with that major version (and an arbitrary
225  * supported minor version).
226  */
227 
228 /** Version number of this interface */
229 #define FUSE_KERNEL_VERSION 7
230 
231 /** Minor version number of this interface */
232 #define FUSE_KERNEL_MINOR_VERSION 36
233 
234 /** The node ID of the root inode */
235 #define FUSE_ROOT_ID 1
236 
237 /* Make sure all structures are padded to 64bit boundary, so 32bit
238    userspace works under 64bit kernels */
239 
240 struct fuse_attr {
241 	uint64_t	ino;
242 	uint64_t	size;
243 	uint64_t	blocks;
244 	uint64_t	atime;
245 	uint64_t	mtime;
246 	uint64_t	ctime;
247 	uint32_t	atimensec;
248 	uint32_t	mtimensec;
249 	uint32_t	ctimensec;
250 	uint32_t	mode;
251 	uint32_t	nlink;
252 	uint32_t	uid;
253 	uint32_t	gid;
254 	uint32_t	rdev;
255 	uint32_t	blksize;
256 	uint32_t	flags;
257 };
258 
259 struct fuse_kstatfs {
260 	uint64_t	blocks;
261 	uint64_t	bfree;
262 	uint64_t	bavail;
263 	uint64_t	files;
264 	uint64_t	ffree;
265 	uint32_t	bsize;
266 	uint32_t	namelen;
267 	uint32_t	frsize;
268 	uint32_t	padding;
269 	uint32_t	spare[6];
270 };
271 
272 struct fuse_file_lock {
273 	uint64_t	start;
274 	uint64_t	end;
275 	uint32_t	type;
276 	uint32_t	pid; /* tgid */
277 };
278 
279 /**
280  * Bitmasks for fuse_setattr_in.valid
281  */
282 #define FATTR_MODE	(1 << 0)
283 #define FATTR_UID	(1 << 1)
284 #define FATTR_GID	(1 << 2)
285 #define FATTR_SIZE	(1 << 3)
286 #define FATTR_ATIME	(1 << 4)
287 #define FATTR_MTIME	(1 << 5)
288 #define FATTR_FH	(1 << 6)
289 #define FATTR_ATIME_NOW	(1 << 7)
290 #define FATTR_MTIME_NOW	(1 << 8)
291 #define FATTR_LOCKOWNER	(1 << 9)
292 #define FATTR_CTIME	(1 << 10)
293 #define FATTR_KILL_SUIDGID	(1 << 11)
294 
295 /**
296  * Flags returned by the OPEN request
297  *
298  * FOPEN_DIRECT_IO: bypass page cache for this open file
299  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
300  * FOPEN_NONSEEKABLE: the file is not seekable
301  * FOPEN_CACHE_DIR: allow caching this directory
302  * FOPEN_STREAM: the file is stream-like (no file position at all)
303  * FOPEN_NOFLUSH: don't flush data cache on close (unless FUSE_WRITEBACK_CACHE)
304  */
305 #define FOPEN_DIRECT_IO		(1 << 0)
306 #define FOPEN_KEEP_CACHE	(1 << 1)
307 #define FOPEN_NONSEEKABLE	(1 << 2)
308 #define FOPEN_CACHE_DIR		(1 << 3)
309 #define FOPEN_STREAM		(1 << 4)
310 #define FOPEN_NOFLUSH		(1 << 5)
311 
312 /**
313  * INIT request/reply flags
314  *
315  * FUSE_ASYNC_READ: asynchronous read requests
316  * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
317  * FUSE_FILE_OPS: kernel sends file handle for fstat, etc... (not yet supported)
318  * FUSE_ATOMIC_O_TRUNC: handles the O_TRUNC open flag in the filesystem
319  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
320  * FUSE_BIG_WRITES: filesystem can handle write size larger than 4kB
321  * FUSE_DONT_MASK: don't apply umask to file mode on create operations
322  * FUSE_SPLICE_WRITE: kernel supports splice write on the device
323  * FUSE_SPLICE_MOVE: kernel supports splice move on the device
324  * FUSE_SPLICE_READ: kernel supports splice read on the device
325  * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
326  * FUSE_HAS_IOCTL_DIR: kernel supports ioctl on directories
327  * FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages
328  * FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
329  * FUSE_READDIRPLUS_AUTO: adaptive readdirplus
330  * FUSE_ASYNC_DIO: asynchronous direct I/O submission
331  * FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
332  * FUSE_NO_OPEN_SUPPORT: kernel supports zero-message opens
333  * FUSE_PARALLEL_DIROPS: allow parallel lookups and readdir
334  * FUSE_HANDLE_KILLPRIV: fs handles killing suid/sgid/cap on write/chown/trunc
335  * FUSE_POSIX_ACL: filesystem supports posix acls
336  * FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED
337  * FUSE_MAX_PAGES: init_out.max_pages contains the max number of req pages
338  * FUSE_CACHE_SYMLINKS: cache READLINK responses
339  * FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir
340  * FUSE_EXPLICIT_INVAL_DATA: only invalidate cached pages on explicit request
341  * FUSE_MAP_ALIGNMENT: init_out.map_alignment contains log2(byte alignment) for
342  *		       foffset and moffset fields in struct
343  *		       fuse_setupmapping_out and fuse_removemapping_one.
344  * FUSE_SUBMOUNTS: kernel supports auto-mounting directory submounts
345  * FUSE_HANDLE_KILLPRIV_V2: fs kills suid/sgid/cap on write/chown/trunc.
346  *			Upon write/truncate suid/sgid is only killed if caller
347  *			does not have CAP_FSETID. Additionally upon
348  *			write/truncate sgid is killed only if file has group
349  *			execute permission. (Same as Linux VFS behavior).
350  * FUSE_SETXATTR_EXT:	Server supports extended struct fuse_setxattr_in
351  * FUSE_INIT_EXT: extended fuse_init_in request
352  * FUSE_INIT_RESERVED: reserved, do not use
353  * FUSE_SECURITY_CTX:	add security context to create, mkdir, symlink, and
354  *			mknod
355  * FUSE_HAS_INODE_DAX:  use per inode DAX
356  */
357 #define FUSE_ASYNC_READ		(1 << 0)
358 #define FUSE_POSIX_LOCKS	(1 << 1)
359 #define FUSE_FILE_OPS		(1 << 2)
360 #define FUSE_ATOMIC_O_TRUNC	(1 << 3)
361 #define FUSE_EXPORT_SUPPORT	(1 << 4)
362 #define FUSE_BIG_WRITES		(1 << 5)
363 #define FUSE_DONT_MASK		(1 << 6)
364 #define FUSE_SPLICE_WRITE	(1 << 7)
365 #define FUSE_SPLICE_MOVE	(1 << 8)
366 #define FUSE_SPLICE_READ	(1 << 9)
367 #define FUSE_FLOCK_LOCKS	(1 << 10)
368 #define FUSE_HAS_IOCTL_DIR	(1 << 11)
369 #define FUSE_AUTO_INVAL_DATA	(1 << 12)
370 #define FUSE_DO_READDIRPLUS	(1 << 13)
371 #define FUSE_READDIRPLUS_AUTO	(1 << 14)
372 #define FUSE_ASYNC_DIO		(1 << 15)
373 #define FUSE_WRITEBACK_CACHE	(1 << 16)
374 #define FUSE_NO_OPEN_SUPPORT	(1 << 17)
375 #define FUSE_PARALLEL_DIROPS    (1 << 18)
376 #define FUSE_HANDLE_KILLPRIV	(1 << 19)
377 #define FUSE_POSIX_ACL		(1 << 20)
378 #define FUSE_ABORT_ERROR	(1 << 21)
379 #define FUSE_MAX_PAGES		(1 << 22)
380 #define FUSE_CACHE_SYMLINKS	(1 << 23)
381 #define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
382 #define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
383 #define FUSE_MAP_ALIGNMENT	(1 << 26)
384 #define FUSE_SUBMOUNTS		(1 << 27)
385 #define FUSE_HANDLE_KILLPRIV_V2	(1 << 28)
386 #define FUSE_SETXATTR_EXT	(1 << 29)
387 #define FUSE_INIT_EXT		(1 << 30)
388 #define FUSE_INIT_RESERVED	(1 << 31)
389 /* bits 32..63 get shifted down 32 bits into the flags2 field */
390 #define FUSE_SECURITY_CTX	(1ULL << 32)
391 #define FUSE_HAS_INODE_DAX	(1ULL << 33)
392 
393 /**
394  * CUSE INIT request/reply flags
395  *
396  * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
397  */
398 #define CUSE_UNRESTRICTED_IOCTL	(1 << 0)
399 
400 /**
401  * Release flags
402  */
403 #define FUSE_RELEASE_FLUSH	(1 << 0)
404 #define FUSE_RELEASE_FLOCK_UNLOCK	(1 << 1)
405 
406 /**
407  * Getattr flags
408  */
409 #define FUSE_GETATTR_FH		(1 << 0)
410 
411 /**
412  * Lock flags
413  */
414 #define FUSE_LK_FLOCK		(1 << 0)
415 
416 /**
417  * WRITE flags
418  *
419  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
420  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
421  * FUSE_WRITE_KILL_SUIDGID: kill suid and sgid bits
422  */
423 #define FUSE_WRITE_CACHE	(1 << 0)
424 #define FUSE_WRITE_LOCKOWNER	(1 << 1)
425 #define FUSE_WRITE_KILL_SUIDGID (1 << 2)
426 
427 /* Obsolete alias; this flag implies killing suid/sgid only. */
428 #define FUSE_WRITE_KILL_PRIV	FUSE_WRITE_KILL_SUIDGID
429 
430 /**
431  * Read flags
432  */
433 #define FUSE_READ_LOCKOWNER	(1 << 1)
434 
435 /**
436  * Ioctl flags
437  *
438  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
439  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
440  * FUSE_IOCTL_RETRY: retry with new iovecs
441  * FUSE_IOCTL_32BIT: 32bit ioctl
442  * FUSE_IOCTL_DIR: is a directory
443  * FUSE_IOCTL_COMPAT_X32: x32 compat ioctl on 64bit machine (64bit time_t)
444  *
445  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
446  */
447 #define FUSE_IOCTL_COMPAT	(1 << 0)
448 #define FUSE_IOCTL_UNRESTRICTED	(1 << 1)
449 #define FUSE_IOCTL_RETRY	(1 << 2)
450 #define FUSE_IOCTL_32BIT	(1 << 3)
451 #define FUSE_IOCTL_DIR		(1 << 4)
452 #define FUSE_IOCTL_COMPAT_X32	(1 << 5)
453 
454 #define FUSE_IOCTL_MAX_IOV	256
455 
456 /**
457  * Poll flags
458  *
459  * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
460  */
461 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
462 
463 /**
464  * Fsync flags
465  *
466  * FUSE_FSYNC_FDATASYNC: Sync data only, not metadata
467  */
468 #define FUSE_FSYNC_FDATASYNC	(1 << 0)
469 
470 /**
471  * fuse_attr flags
472  *
473  * FUSE_ATTR_SUBMOUNT: Object is a submount root
474  * FUSE_ATTR_DAX: Enable DAX for this file in per inode DAX mode
475  */
476 #define FUSE_ATTR_SUBMOUNT      (1 << 0)
477 #define FUSE_ATTR_DAX		(1 << 1)
478 
479 /**
480  * Open flags
481  * FUSE_OPEN_KILL_SUIDGID: Kill suid and sgid if executable
482  */
483 #define FUSE_OPEN_KILL_SUIDGID	(1 << 0)
484 
485 /**
486  * setxattr flags
487  * FUSE_SETXATTR_ACL_KILL_SGID: Clear SGID when system.posix_acl_access is set
488  */
489 #define FUSE_SETXATTR_ACL_KILL_SGID	(1 << 0)
490 
491 enum fuse_opcode {
492 	FUSE_LOOKUP		= 1,
493 	FUSE_FORGET		= 2,  /* no reply */
494 	FUSE_GETATTR		= 3,
495 	FUSE_SETATTR		= 4,
496 	FUSE_READLINK		= 5,
497 	FUSE_SYMLINK		= 6,
498 	FUSE_MKNOD		= 8,
499 	FUSE_MKDIR		= 9,
500 	FUSE_UNLINK		= 10,
501 	FUSE_RMDIR		= 11,
502 	FUSE_RENAME		= 12,
503 	FUSE_LINK		= 13,
504 	FUSE_OPEN		= 14,
505 	FUSE_READ		= 15,
506 	FUSE_WRITE		= 16,
507 	FUSE_STATFS		= 17,
508 	FUSE_RELEASE		= 18,
509 	FUSE_FSYNC		= 20,
510 	FUSE_SETXATTR		= 21,
511 	FUSE_GETXATTR		= 22,
512 	FUSE_LISTXATTR		= 23,
513 	FUSE_REMOVEXATTR	= 24,
514 	FUSE_FLUSH		= 25,
515 	FUSE_INIT		= 26,
516 	FUSE_OPENDIR		= 27,
517 	FUSE_READDIR		= 28,
518 	FUSE_RELEASEDIR		= 29,
519 	FUSE_FSYNCDIR		= 30,
520 	FUSE_GETLK		= 31,
521 	FUSE_SETLK		= 32,
522 	FUSE_SETLKW		= 33,
523 	FUSE_ACCESS		= 34,
524 	FUSE_CREATE		= 35,
525 	FUSE_INTERRUPT		= 36,
526 	FUSE_BMAP		= 37,
527 	FUSE_DESTROY		= 38,
528 	FUSE_IOCTL		= 39,
529 	FUSE_POLL		= 40,
530 	FUSE_NOTIFY_REPLY	= 41,
531 	FUSE_BATCH_FORGET	= 42,
532 	FUSE_FALLOCATE		= 43,
533 	FUSE_READDIRPLUS	= 44,
534 	FUSE_RENAME2		= 45,
535 	FUSE_LSEEK		= 46,
536 	FUSE_COPY_FILE_RANGE	= 47,
537 	FUSE_SETUPMAPPING	= 48,
538 	FUSE_REMOVEMAPPING	= 49,
539 	FUSE_SYNCFS		= 50,
540 
541 	/* CUSE specific operations */
542 	CUSE_INIT		= 4096,
543 
544 	/* Reserved opcodes: helpful to detect structure endian-ness */
545 	CUSE_INIT_BSWAP_RESERVED	= 1048576,	/* CUSE_INIT << 8 */
546 	FUSE_INIT_BSWAP_RESERVED	= 436207616,	/* FUSE_INIT << 24 */
547 };
548 
549 enum fuse_notify_code {
550 	FUSE_NOTIFY_POLL   = 1,
551 	FUSE_NOTIFY_INVAL_INODE = 2,
552 	FUSE_NOTIFY_INVAL_ENTRY = 3,
553 	FUSE_NOTIFY_STORE = 4,
554 	FUSE_NOTIFY_RETRIEVE = 5,
555 	FUSE_NOTIFY_DELETE = 6,
556 	FUSE_NOTIFY_CODE_MAX,
557 };
558 
559 /* The read buffer is required to be at least 8k, but may be much larger */
560 #define FUSE_MIN_READ_BUFFER 8192
561 
562 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
563 
564 struct fuse_entry_out {
565 	uint64_t	nodeid;		/* Inode ID */
566 	uint64_t	generation;	/* Inode generation: nodeid:gen must
567 					   be unique for the fs's lifetime */
568 	uint64_t	entry_valid;	/* Cache timeout for the name */
569 	uint64_t	attr_valid;	/* Cache timeout for the attributes */
570 	uint32_t	entry_valid_nsec;
571 	uint32_t	attr_valid_nsec;
572 	struct fuse_attr attr;
573 };
574 
575 struct fuse_forget_in {
576 	uint64_t	nlookup;
577 };
578 
579 struct fuse_forget_one {
580 	uint64_t	nodeid;
581 	uint64_t	nlookup;
582 };
583 
584 struct fuse_batch_forget_in {
585 	uint32_t	count;
586 	uint32_t	dummy;
587 };
588 
589 struct fuse_getattr_in {
590 	uint32_t	getattr_flags;
591 	uint32_t	dummy;
592 	uint64_t	fh;
593 };
594 
595 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
596 
597 struct fuse_attr_out {
598 	uint64_t	attr_valid;	/* Cache timeout for the attributes */
599 	uint32_t	attr_valid_nsec;
600 	uint32_t	dummy;
601 	struct fuse_attr attr;
602 };
603 
604 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
605 
606 struct fuse_mknod_in {
607 	uint32_t	mode;
608 	uint32_t	rdev;
609 	uint32_t	umask;
610 	uint32_t	padding;
611 };
612 
613 struct fuse_mkdir_in {
614 	uint32_t	mode;
615 	uint32_t	umask;
616 };
617 
618 struct fuse_rename_in {
619 	uint64_t	newdir;
620 };
621 
622 struct fuse_rename2_in {
623 	uint64_t	newdir;
624 	uint32_t	flags;
625 	uint32_t	padding;
626 };
627 
628 struct fuse_link_in {
629 	uint64_t	oldnodeid;
630 };
631 
632 struct fuse_setattr_in {
633 	uint32_t	valid;
634 	uint32_t	padding;
635 	uint64_t	fh;
636 	uint64_t	size;
637 	uint64_t	lock_owner;
638 	uint64_t	atime;
639 	uint64_t	mtime;
640 	uint64_t	ctime;
641 	uint32_t	atimensec;
642 	uint32_t	mtimensec;
643 	uint32_t	ctimensec;
644 	uint32_t	mode;
645 	uint32_t	unused4;
646 	uint32_t	uid;
647 	uint32_t	gid;
648 	uint32_t	unused5;
649 };
650 
651 struct fuse_open_in {
652 	uint32_t	flags;
653 	uint32_t	open_flags;	/* FUSE_OPEN_... */
654 };
655 
656 struct fuse_create_in {
657 	uint32_t	flags;
658 	uint32_t	mode;
659 	uint32_t	umask;
660 	uint32_t	open_flags;	/* FUSE_OPEN_... */
661 };
662 
663 struct fuse_open_out {
664 	uint64_t	fh;
665 	uint32_t	open_flags;
666 	uint32_t	padding;
667 };
668 
669 struct fuse_release_in {
670 	uint64_t	fh;
671 	uint32_t	flags;
672 	uint32_t	release_flags;
673 	uint64_t	lock_owner;
674 };
675 
676 struct fuse_flush_in {
677 	uint64_t	fh;
678 	uint32_t	unused;
679 	uint32_t	padding;
680 	uint64_t	lock_owner;
681 };
682 
683 struct fuse_read_in {
684 	uint64_t	fh;
685 	uint64_t	offset;
686 	uint32_t	size;
687 	uint32_t	read_flags;
688 	uint64_t	lock_owner;
689 	uint32_t	flags;
690 	uint32_t	padding;
691 };
692 
693 #define FUSE_COMPAT_WRITE_IN_SIZE 24
694 
695 struct fuse_write_in {
696 	uint64_t	fh;
697 	uint64_t	offset;
698 	uint32_t	size;
699 	uint32_t	write_flags;
700 	uint64_t	lock_owner;
701 	uint32_t	flags;
702 	uint32_t	padding;
703 };
704 
705 struct fuse_write_out {
706 	uint32_t	size;
707 	uint32_t	padding;
708 };
709 
710 #define FUSE_COMPAT_STATFS_SIZE 48
711 
712 struct fuse_statfs_out {
713 	struct fuse_kstatfs st;
714 };
715 
716 struct fuse_fsync_in {
717 	uint64_t	fh;
718 	uint32_t	fsync_flags;
719 	uint32_t	padding;
720 };
721 
722 #define FUSE_COMPAT_SETXATTR_IN_SIZE 8
723 
724 struct fuse_setxattr_in {
725 	uint32_t	size;
726 	uint32_t	flags;
727 	uint32_t	setxattr_flags;
728 	uint32_t	padding;
729 };
730 
731 struct fuse_getxattr_in {
732 	uint32_t	size;
733 	uint32_t	padding;
734 };
735 
736 struct fuse_getxattr_out {
737 	uint32_t	size;
738 	uint32_t	padding;
739 };
740 
741 struct fuse_lk_in {
742 	uint64_t	fh;
743 	uint64_t	owner;
744 	struct fuse_file_lock lk;
745 	uint32_t	lk_flags;
746 	uint32_t	padding;
747 };
748 
749 struct fuse_lk_out {
750 	struct fuse_file_lock lk;
751 };
752 
753 struct fuse_access_in {
754 	uint32_t	mask;
755 	uint32_t	padding;
756 };
757 
758 struct fuse_init_in {
759 	uint32_t	major;
760 	uint32_t	minor;
761 	uint32_t	max_readahead;
762 	uint32_t	flags;
763 	uint32_t	flags2;
764 	uint32_t	unused[11];
765 };
766 
767 #define FUSE_COMPAT_INIT_OUT_SIZE 8
768 #define FUSE_COMPAT_22_INIT_OUT_SIZE 24
769 
770 struct fuse_init_out {
771 	uint32_t	major;
772 	uint32_t	minor;
773 	uint32_t	max_readahead;
774 	uint32_t	flags;
775 	uint16_t	max_background;
776 	uint16_t	congestion_threshold;
777 	uint32_t	max_write;
778 	uint32_t	time_gran;
779 	uint16_t	max_pages;
780 	uint16_t	map_alignment;
781 	uint32_t	flags2;
782 	uint32_t	unused[7];
783 };
784 
785 #define CUSE_INIT_INFO_MAX 4096
786 
787 struct cuse_init_in {
788 	uint32_t	major;
789 	uint32_t	minor;
790 	uint32_t	unused;
791 	uint32_t	flags;
792 };
793 
794 struct cuse_init_out {
795 	uint32_t	major;
796 	uint32_t	minor;
797 	uint32_t	unused;
798 	uint32_t	flags;
799 	uint32_t	max_read;
800 	uint32_t	max_write;
801 	uint32_t	dev_major;		/* chardev major */
802 	uint32_t	dev_minor;		/* chardev minor */
803 	uint32_t	spare[10];
804 };
805 
806 struct fuse_interrupt_in {
807 	uint64_t	unique;
808 };
809 
810 struct fuse_bmap_in {
811 	uint64_t	block;
812 	uint32_t	blocksize;
813 	uint32_t	padding;
814 };
815 
816 struct fuse_bmap_out {
817 	uint64_t	block;
818 };
819 
820 struct fuse_ioctl_in {
821 	uint64_t	fh;
822 	uint32_t	flags;
823 	uint32_t	cmd;
824 	uint64_t	arg;
825 	uint32_t	in_size;
826 	uint32_t	out_size;
827 };
828 
829 struct fuse_ioctl_iovec {
830 	uint64_t	base;
831 	uint64_t	len;
832 };
833 
834 struct fuse_ioctl_out {
835 	int32_t		result;
836 	uint32_t	flags;
837 	uint32_t	in_iovs;
838 	uint32_t	out_iovs;
839 };
840 
841 struct fuse_poll_in {
842 	uint64_t	fh;
843 	uint64_t	kh;
844 	uint32_t	flags;
845 	uint32_t	events;
846 };
847 
848 struct fuse_poll_out {
849 	uint32_t	revents;
850 	uint32_t	padding;
851 };
852 
853 struct fuse_notify_poll_wakeup_out {
854 	uint64_t	kh;
855 };
856 
857 struct fuse_fallocate_in {
858 	uint64_t	fh;
859 	uint64_t	offset;
860 	uint64_t	length;
861 	uint32_t	mode;
862 	uint32_t	padding;
863 };
864 
865 struct fuse_in_header {
866 	uint32_t	len;
867 	uint32_t	opcode;
868 	uint64_t	unique;
869 	uint64_t	nodeid;
870 	uint32_t	uid;
871 	uint32_t	gid;
872 	uint32_t	pid;
873 	uint32_t	padding;
874 };
875 
876 struct fuse_out_header {
877 	uint32_t	len;
878 	int32_t		error;
879 	uint64_t	unique;
880 };
881 
882 struct fuse_dirent {
883 	uint64_t	ino;
884 	uint64_t	off;
885 	uint32_t	namelen;
886 	uint32_t	type;
887 	char name[];
888 };
889 
890 /* Align variable length records to 64bit boundary */
891 #define FUSE_REC_ALIGN(x) \
892 	(((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
893 
894 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
895 #define FUSE_DIRENT_ALIGN(x) FUSE_REC_ALIGN(x)
896 #define FUSE_DIRENT_SIZE(d) \
897 	FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
898 
899 struct fuse_direntplus {
900 	struct fuse_entry_out entry_out;
901 	struct fuse_dirent dirent;
902 };
903 
904 #define FUSE_NAME_OFFSET_DIRENTPLUS \
905 	offsetof(struct fuse_direntplus, dirent.name)
906 #define FUSE_DIRENTPLUS_SIZE(d) \
907 	FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET_DIRENTPLUS + (d)->dirent.namelen)
908 
909 struct fuse_notify_inval_inode_out {
910 	uint64_t	ino;
911 	int64_t		off;
912 	int64_t		len;
913 };
914 
915 struct fuse_notify_inval_entry_out {
916 	uint64_t	parent;
917 	uint32_t	namelen;
918 	uint32_t	padding;
919 };
920 
921 struct fuse_notify_delete_out {
922 	uint64_t	parent;
923 	uint64_t	child;
924 	uint32_t	namelen;
925 	uint32_t	padding;
926 };
927 
928 struct fuse_notify_store_out {
929 	uint64_t	nodeid;
930 	uint64_t	offset;
931 	uint32_t	size;
932 	uint32_t	padding;
933 };
934 
935 struct fuse_notify_retrieve_out {
936 	uint64_t	notify_unique;
937 	uint64_t	nodeid;
938 	uint64_t	offset;
939 	uint32_t	size;
940 	uint32_t	padding;
941 };
942 
943 /* Matches the size of fuse_write_in */
944 struct fuse_notify_retrieve_in {
945 	uint64_t	dummy1;
946 	uint64_t	offset;
947 	uint32_t	size;
948 	uint32_t	dummy2;
949 	uint64_t	dummy3;
950 	uint64_t	dummy4;
951 };
952 
953 /* Device ioctls: */
954 #define FUSE_DEV_IOC_MAGIC		229
955 #define FUSE_DEV_IOC_CLONE		_IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)
956 
957 struct fuse_lseek_in {
958 	uint64_t	fh;
959 	uint64_t	offset;
960 	uint32_t	whence;
961 	uint32_t	padding;
962 };
963 
964 struct fuse_lseek_out {
965 	uint64_t	offset;
966 };
967 
968 struct fuse_copy_file_range_in {
969 	uint64_t	fh_in;
970 	uint64_t	off_in;
971 	uint64_t	nodeid_out;
972 	uint64_t	fh_out;
973 	uint64_t	off_out;
974 	uint64_t	len;
975 	uint64_t	flags;
976 };
977 
978 #define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
979 #define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
980 struct fuse_setupmapping_in {
981 	/* An already open handle */
982 	uint64_t	fh;
983 	/* Offset into the file to start the mapping */
984 	uint64_t	foffset;
985 	/* Length of mapping required */
986 	uint64_t	len;
987 	/* Flags, FUSE_SETUPMAPPING_FLAG_* */
988 	uint64_t	flags;
989 	/* Offset in Memory Window */
990 	uint64_t	moffset;
991 };
992 
993 struct fuse_removemapping_in {
994 	/* number of fuse_removemapping_one follows */
995 	uint32_t        count;
996 };
997 
998 struct fuse_removemapping_one {
999 	/* Offset into the dax window start the unmapping */
1000 	uint64_t        moffset;
1001 	/* Length of mapping required */
1002 	uint64_t	len;
1003 };
1004 
1005 #define FUSE_REMOVEMAPPING_MAX_ENTRY   \
1006 		(PAGE_SIZE / sizeof(struct fuse_removemapping_one))
1007 
1008 struct fuse_syncfs_in {
1009 	uint64_t	padding;
1010 };
1011 
1012 /*
1013  * For each security context, send fuse_secctx with size of security context
1014  * fuse_secctx will be followed by security context name and this in turn
1015  * will be followed by actual context label.
1016  * fuse_secctx, name, context
1017  */
1018 struct fuse_secctx {
1019 	uint32_t	size;
1020 	uint32_t	padding;
1021 };
1022 
1023 /*
1024  * Contains the information about how many fuse_secctx structures are being
1025  * sent and what's the total size of all security contexts (including
1026  * size of fuse_secctx_header).
1027  *
1028  */
1029 struct fuse_secctx_header {
1030 	uint32_t	size;
1031 	uint32_t	nr_secctx;
1032 };
1033 
1034 #endif /* _LINUX_FUSE_H */
1035