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 
180 #ifndef _LINUX_FUSE_H
181 #define _LINUX_FUSE_H
182 
183 #include <stdint.h>
184 
185 /*
186  * Version negotiation:
187  *
188  * Both the kernel and userspace send the version they support in the
189  * INIT request and reply respectively.
190  *
191  * If the major versions match then both shall use the smallest
192  * of the two minor versions for communication.
193  *
194  * If the kernel supports a larger major version, then userspace shall
195  * reply with the major version it supports, ignore the rest of the
196  * INIT message and expect a new INIT message from the kernel with a
197  * matching major version.
198  *
199  * If the library supports a larger major version, then it shall fall
200  * back to the major protocol version sent by the kernel for
201  * communication and reply with that major version (and an arbitrary
202  * supported minor version).
203  */
204 
205 /** Version number of this interface */
206 #define FUSE_KERNEL_VERSION 7
207 
208 /** Minor version number of this interface */
209 #define FUSE_KERNEL_MINOR_VERSION 32
210 
211 /** The node ID of the root inode */
212 #define FUSE_ROOT_ID 1
213 
214 /* Make sure all structures are padded to 64bit boundary, so 32bit
215    userspace works under 64bit kernels */
216 
217 struct fuse_attr {
218 	uint64_t	ino;
219 	uint64_t	size;
220 	uint64_t	blocks;
221 	uint64_t	atime;
222 	uint64_t	mtime;
223 	uint64_t	ctime;
224 	uint32_t	atimensec;
225 	uint32_t	mtimensec;
226 	uint32_t	ctimensec;
227 	uint32_t	mode;
228 	uint32_t	nlink;
229 	uint32_t	uid;
230 	uint32_t	gid;
231 	uint32_t	rdev;
232 	uint32_t	blksize;
233 	uint32_t	flags;
234 };
235 
236 struct fuse_kstatfs {
237 	uint64_t	blocks;
238 	uint64_t	bfree;
239 	uint64_t	bavail;
240 	uint64_t	files;
241 	uint64_t	ffree;
242 	uint32_t	bsize;
243 	uint32_t	namelen;
244 	uint32_t	frsize;
245 	uint32_t	padding;
246 	uint32_t	spare[6];
247 };
248 
249 struct fuse_file_lock {
250 	uint64_t	start;
251 	uint64_t	end;
252 	uint32_t	type;
253 	uint32_t	pid; /* tgid */
254 };
255 
256 /**
257  * Bitmasks for fuse_setattr_in.valid
258  */
259 #define FATTR_MODE	(1 << 0)
260 #define FATTR_UID	(1 << 1)
261 #define FATTR_GID	(1 << 2)
262 #define FATTR_SIZE	(1 << 3)
263 #define FATTR_ATIME	(1 << 4)
264 #define FATTR_MTIME	(1 << 5)
265 #define FATTR_FH	(1 << 6)
266 #define FATTR_ATIME_NOW	(1 << 7)
267 #define FATTR_MTIME_NOW	(1 << 8)
268 #define FATTR_LOCKOWNER	(1 << 9)
269 #define FATTR_CTIME	(1 << 10)
270 
271 /**
272  * Flags returned by the OPEN request
273  *
274  * FOPEN_DIRECT_IO: bypass page cache for this open file
275  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
276  * FOPEN_NONSEEKABLE: the file is not seekable
277  * FOPEN_CACHE_DIR: allow caching this directory
278  * FOPEN_STREAM: the file is stream-like (no file position at all)
279  */
280 #define FOPEN_DIRECT_IO		(1 << 0)
281 #define FOPEN_KEEP_CACHE	(1 << 1)
282 #define FOPEN_NONSEEKABLE	(1 << 2)
283 #define FOPEN_CACHE_DIR		(1 << 3)
284 #define FOPEN_STREAM		(1 << 4)
285 
286 /**
287  * INIT request/reply flags
288  *
289  * FUSE_ASYNC_READ: asynchronous read requests
290  * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
291  * FUSE_FILE_OPS: kernel sends file handle for fstat, etc... (not yet supported)
292  * FUSE_ATOMIC_O_TRUNC: handles the O_TRUNC open flag in the filesystem
293  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
294  * FUSE_BIG_WRITES: filesystem can handle write size larger than 4kB
295  * FUSE_DONT_MASK: don't apply umask to file mode on create operations
296  * FUSE_SPLICE_WRITE: kernel supports splice write on the device
297  * FUSE_SPLICE_MOVE: kernel supports splice move on the device
298  * FUSE_SPLICE_READ: kernel supports splice read on the device
299  * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
300  * FUSE_HAS_IOCTL_DIR: kernel supports ioctl on directories
301  * FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages
302  * FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
303  * FUSE_READDIRPLUS_AUTO: adaptive readdirplus
304  * FUSE_ASYNC_DIO: asynchronous direct I/O submission
305  * FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
306  * FUSE_NO_OPEN_SUPPORT: kernel supports zero-message opens
307  * FUSE_PARALLEL_DIROPS: allow parallel lookups and readdir
308  * FUSE_HANDLE_KILLPRIV: fs handles killing suid/sgid/cap on write/chown/trunc
309  * FUSE_POSIX_ACL: filesystem supports posix acls
310  * FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED
311  * FUSE_MAX_PAGES: init_out.max_pages contains the max number of req pages
312  * FUSE_CACHE_SYMLINKS: cache READLINK responses
313  * FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir
314  * FUSE_EXPLICIT_INVAL_DATA: only invalidate cached pages on explicit request
315  * FUSE_MAP_ALIGNMENT: init_out.map_alignment contains log2(byte alignment) for
316  *		       foffset and moffset fields in struct
317  *		       fuse_setupmapping_out and fuse_removemapping_one.
318  * FUSE_SUBMOUNTS: kernel supports auto-mounting directory submounts
319  */
320 #define FUSE_ASYNC_READ		(1 << 0)
321 #define FUSE_POSIX_LOCKS	(1 << 1)
322 #define FUSE_FILE_OPS		(1 << 2)
323 #define FUSE_ATOMIC_O_TRUNC	(1 << 3)
324 #define FUSE_EXPORT_SUPPORT	(1 << 4)
325 #define FUSE_BIG_WRITES		(1 << 5)
326 #define FUSE_DONT_MASK		(1 << 6)
327 #define FUSE_SPLICE_WRITE	(1 << 7)
328 #define FUSE_SPLICE_MOVE	(1 << 8)
329 #define FUSE_SPLICE_READ	(1 << 9)
330 #define FUSE_FLOCK_LOCKS	(1 << 10)
331 #define FUSE_HAS_IOCTL_DIR	(1 << 11)
332 #define FUSE_AUTO_INVAL_DATA	(1 << 12)
333 #define FUSE_DO_READDIRPLUS	(1 << 13)
334 #define FUSE_READDIRPLUS_AUTO	(1 << 14)
335 #define FUSE_ASYNC_DIO		(1 << 15)
336 #define FUSE_WRITEBACK_CACHE	(1 << 16)
337 #define FUSE_NO_OPEN_SUPPORT	(1 << 17)
338 #define FUSE_PARALLEL_DIROPS    (1 << 18)
339 #define FUSE_HANDLE_KILLPRIV	(1 << 19)
340 #define FUSE_POSIX_ACL		(1 << 20)
341 #define FUSE_ABORT_ERROR	(1 << 21)
342 #define FUSE_MAX_PAGES		(1 << 22)
343 #define FUSE_CACHE_SYMLINKS	(1 << 23)
344 #define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
345 #define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
346 #define FUSE_MAP_ALIGNMENT	(1 << 26)
347 #define FUSE_SUBMOUNTS		(1 << 27)
348 
349 /**
350  * CUSE INIT request/reply flags
351  *
352  * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
353  */
354 #define CUSE_UNRESTRICTED_IOCTL	(1 << 0)
355 
356 /**
357  * Release flags
358  */
359 #define FUSE_RELEASE_FLUSH	(1 << 0)
360 #define FUSE_RELEASE_FLOCK_UNLOCK	(1 << 1)
361 
362 /**
363  * Getattr flags
364  */
365 #define FUSE_GETATTR_FH		(1 << 0)
366 
367 /**
368  * Lock flags
369  */
370 #define FUSE_LK_FLOCK		(1 << 0)
371 
372 /**
373  * WRITE flags
374  *
375  * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
376  * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
377  * FUSE_WRITE_KILL_PRIV: kill suid and sgid bits
378  */
379 #define FUSE_WRITE_CACHE	(1 << 0)
380 #define FUSE_WRITE_LOCKOWNER	(1 << 1)
381 #define FUSE_WRITE_KILL_PRIV	(1 << 2)
382 
383 /**
384  * Read flags
385  */
386 #define FUSE_READ_LOCKOWNER	(1 << 1)
387 
388 /**
389  * Ioctl flags
390  *
391  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
392  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
393  * FUSE_IOCTL_RETRY: retry with new iovecs
394  * FUSE_IOCTL_32BIT: 32bit ioctl
395  * FUSE_IOCTL_DIR: is a directory
396  * FUSE_IOCTL_COMPAT_X32: x32 compat ioctl on 64bit machine (64bit time_t)
397  *
398  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
399  */
400 #define FUSE_IOCTL_COMPAT	(1 << 0)
401 #define FUSE_IOCTL_UNRESTRICTED	(1 << 1)
402 #define FUSE_IOCTL_RETRY	(1 << 2)
403 #define FUSE_IOCTL_32BIT	(1 << 3)
404 #define FUSE_IOCTL_DIR		(1 << 4)
405 #define FUSE_IOCTL_COMPAT_X32	(1 << 5)
406 
407 #define FUSE_IOCTL_MAX_IOV	256
408 
409 /**
410  * Poll flags
411  *
412  * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
413  */
414 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
415 
416 /**
417  * Fsync flags
418  *
419  * FUSE_FSYNC_FDATASYNC: Sync data only, not metadata
420  */
421 #define FUSE_FSYNC_FDATASYNC	(1 << 0)
422 
423 /**
424  * fuse_attr flags
425  *
426  * FUSE_ATTR_SUBMOUNT: Object is a submount root
427  */
428 #define FUSE_ATTR_SUBMOUNT      (1 << 0)
429 
430 enum fuse_opcode {
431 	FUSE_LOOKUP		= 1,
432 	FUSE_FORGET		= 2,  /* no reply */
433 	FUSE_GETATTR		= 3,
434 	FUSE_SETATTR		= 4,
435 	FUSE_READLINK		= 5,
436 	FUSE_SYMLINK		= 6,
437 	FUSE_MKNOD		= 8,
438 	FUSE_MKDIR		= 9,
439 	FUSE_UNLINK		= 10,
440 	FUSE_RMDIR		= 11,
441 	FUSE_RENAME		= 12,
442 	FUSE_LINK		= 13,
443 	FUSE_OPEN		= 14,
444 	FUSE_READ		= 15,
445 	FUSE_WRITE		= 16,
446 	FUSE_STATFS		= 17,
447 	FUSE_RELEASE		= 18,
448 	FUSE_FSYNC		= 20,
449 	FUSE_SETXATTR		= 21,
450 	FUSE_GETXATTR		= 22,
451 	FUSE_LISTXATTR		= 23,
452 	FUSE_REMOVEXATTR	= 24,
453 	FUSE_FLUSH		= 25,
454 	FUSE_INIT		= 26,
455 	FUSE_OPENDIR		= 27,
456 	FUSE_READDIR		= 28,
457 	FUSE_RELEASEDIR		= 29,
458 	FUSE_FSYNCDIR		= 30,
459 	FUSE_GETLK		= 31,
460 	FUSE_SETLK		= 32,
461 	FUSE_SETLKW		= 33,
462 	FUSE_ACCESS		= 34,
463 	FUSE_CREATE		= 35,
464 	FUSE_INTERRUPT		= 36,
465 	FUSE_BMAP		= 37,
466 	FUSE_DESTROY		= 38,
467 	FUSE_IOCTL		= 39,
468 	FUSE_POLL		= 40,
469 	FUSE_NOTIFY_REPLY	= 41,
470 	FUSE_BATCH_FORGET	= 42,
471 	FUSE_FALLOCATE		= 43,
472 	FUSE_READDIRPLUS	= 44,
473 	FUSE_RENAME2		= 45,
474 	FUSE_LSEEK		= 46,
475 	FUSE_COPY_FILE_RANGE	= 47,
476 	FUSE_SETUPMAPPING	= 48,
477 	FUSE_REMOVEMAPPING	= 49,
478 
479 	/* CUSE specific operations */
480 	CUSE_INIT		= 4096,
481 
482 	/* Reserved opcodes: helpful to detect structure endian-ness */
483 	CUSE_INIT_BSWAP_RESERVED	= 1048576,	/* CUSE_INIT << 8 */
484 	FUSE_INIT_BSWAP_RESERVED	= 436207616,	/* FUSE_INIT << 24 */
485 };
486 
487 enum fuse_notify_code {
488 	FUSE_NOTIFY_POLL   = 1,
489 	FUSE_NOTIFY_INVAL_INODE = 2,
490 	FUSE_NOTIFY_INVAL_ENTRY = 3,
491 	FUSE_NOTIFY_STORE = 4,
492 	FUSE_NOTIFY_RETRIEVE = 5,
493 	FUSE_NOTIFY_DELETE = 6,
494 	FUSE_NOTIFY_CODE_MAX,
495 };
496 
497 /* The read buffer is required to be at least 8k, but may be much larger */
498 #define FUSE_MIN_READ_BUFFER 8192
499 
500 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
501 
502 struct fuse_entry_out {
503 	uint64_t	nodeid;		/* Inode ID */
504 	uint64_t	generation;	/* Inode generation: nodeid:gen must
505 					   be unique for the fs's lifetime */
506 	uint64_t	entry_valid;	/* Cache timeout for the name */
507 	uint64_t	attr_valid;	/* Cache timeout for the attributes */
508 	uint32_t	entry_valid_nsec;
509 	uint32_t	attr_valid_nsec;
510 	struct fuse_attr attr;
511 };
512 
513 struct fuse_forget_in {
514 	uint64_t	nlookup;
515 };
516 
517 struct fuse_forget_one {
518 	uint64_t	nodeid;
519 	uint64_t	nlookup;
520 };
521 
522 struct fuse_batch_forget_in {
523 	uint32_t	count;
524 	uint32_t	dummy;
525 };
526 
527 struct fuse_getattr_in {
528 	uint32_t	getattr_flags;
529 	uint32_t	dummy;
530 	uint64_t	fh;
531 };
532 
533 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
534 
535 struct fuse_attr_out {
536 	uint64_t	attr_valid;	/* Cache timeout for the attributes */
537 	uint32_t	attr_valid_nsec;
538 	uint32_t	dummy;
539 	struct fuse_attr attr;
540 };
541 
542 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
543 
544 struct fuse_mknod_in {
545 	uint32_t	mode;
546 	uint32_t	rdev;
547 	uint32_t	umask;
548 	uint32_t	padding;
549 };
550 
551 struct fuse_mkdir_in {
552 	uint32_t	mode;
553 	uint32_t	umask;
554 };
555 
556 struct fuse_rename_in {
557 	uint64_t	newdir;
558 };
559 
560 struct fuse_rename2_in {
561 	uint64_t	newdir;
562 	uint32_t	flags;
563 	uint32_t	padding;
564 };
565 
566 struct fuse_link_in {
567 	uint64_t	oldnodeid;
568 };
569 
570 struct fuse_setattr_in {
571 	uint32_t	valid;
572 	uint32_t	padding;
573 	uint64_t	fh;
574 	uint64_t	size;
575 	uint64_t	lock_owner;
576 	uint64_t	atime;
577 	uint64_t	mtime;
578 	uint64_t	ctime;
579 	uint32_t	atimensec;
580 	uint32_t	mtimensec;
581 	uint32_t	ctimensec;
582 	uint32_t	mode;
583 	uint32_t	unused4;
584 	uint32_t	uid;
585 	uint32_t	gid;
586 	uint32_t	unused5;
587 };
588 
589 struct fuse_open_in {
590 	uint32_t	flags;
591 	uint32_t	unused;
592 };
593 
594 struct fuse_create_in {
595 	uint32_t	flags;
596 	uint32_t	mode;
597 	uint32_t	umask;
598 	uint32_t	padding;
599 };
600 
601 struct fuse_open_out {
602 	uint64_t	fh;
603 	uint32_t	open_flags;
604 	uint32_t	padding;
605 };
606 
607 struct fuse_release_in {
608 	uint64_t	fh;
609 	uint32_t	flags;
610 	uint32_t	release_flags;
611 	uint64_t	lock_owner;
612 };
613 
614 struct fuse_flush_in {
615 	uint64_t	fh;
616 	uint32_t	unused;
617 	uint32_t	padding;
618 	uint64_t	lock_owner;
619 };
620 
621 struct fuse_read_in {
622 	uint64_t	fh;
623 	uint64_t	offset;
624 	uint32_t	size;
625 	uint32_t	read_flags;
626 	uint64_t	lock_owner;
627 	uint32_t	flags;
628 	uint32_t	padding;
629 };
630 
631 #define FUSE_COMPAT_WRITE_IN_SIZE 24
632 
633 struct fuse_write_in {
634 	uint64_t	fh;
635 	uint64_t	offset;
636 	uint32_t	size;
637 	uint32_t	write_flags;
638 	uint64_t	lock_owner;
639 	uint32_t	flags;
640 	uint32_t	padding;
641 };
642 
643 struct fuse_write_out {
644 	uint32_t	size;
645 	uint32_t	padding;
646 };
647 
648 #define FUSE_COMPAT_STATFS_SIZE 48
649 
650 struct fuse_statfs_out {
651 	struct fuse_kstatfs st;
652 };
653 
654 struct fuse_fsync_in {
655 	uint64_t	fh;
656 	uint32_t	fsync_flags;
657 	uint32_t	padding;
658 };
659 
660 struct fuse_setxattr_in {
661 	uint32_t	size;
662 	uint32_t	flags;
663 };
664 
665 struct fuse_getxattr_in {
666 	uint32_t	size;
667 	uint32_t	padding;
668 };
669 
670 struct fuse_getxattr_out {
671 	uint32_t	size;
672 	uint32_t	padding;
673 };
674 
675 struct fuse_lk_in {
676 	uint64_t	fh;
677 	uint64_t	owner;
678 	struct fuse_file_lock lk;
679 	uint32_t	lk_flags;
680 	uint32_t	padding;
681 };
682 
683 struct fuse_lk_out {
684 	struct fuse_file_lock lk;
685 };
686 
687 struct fuse_access_in {
688 	uint32_t	mask;
689 	uint32_t	padding;
690 };
691 
692 struct fuse_init_in {
693 	uint32_t	major;
694 	uint32_t	minor;
695 	uint32_t	max_readahead;
696 	uint32_t	flags;
697 };
698 
699 #define FUSE_COMPAT_INIT_OUT_SIZE 8
700 #define FUSE_COMPAT_22_INIT_OUT_SIZE 24
701 
702 struct fuse_init_out {
703 	uint32_t	major;
704 	uint32_t	minor;
705 	uint32_t	max_readahead;
706 	uint32_t	flags;
707 	uint16_t	max_background;
708 	uint16_t	congestion_threshold;
709 	uint32_t	max_write;
710 	uint32_t	time_gran;
711 	uint16_t	max_pages;
712 	uint16_t	map_alignment;
713 	uint32_t	unused[8];
714 };
715 
716 #define CUSE_INIT_INFO_MAX 4096
717 
718 struct cuse_init_in {
719 	uint32_t	major;
720 	uint32_t	minor;
721 	uint32_t	unused;
722 	uint32_t	flags;
723 };
724 
725 struct cuse_init_out {
726 	uint32_t	major;
727 	uint32_t	minor;
728 	uint32_t	unused;
729 	uint32_t	flags;
730 	uint32_t	max_read;
731 	uint32_t	max_write;
732 	uint32_t	dev_major;		/* chardev major */
733 	uint32_t	dev_minor;		/* chardev minor */
734 	uint32_t	spare[10];
735 };
736 
737 struct fuse_interrupt_in {
738 	uint64_t	unique;
739 };
740 
741 struct fuse_bmap_in {
742 	uint64_t	block;
743 	uint32_t	blocksize;
744 	uint32_t	padding;
745 };
746 
747 struct fuse_bmap_out {
748 	uint64_t	block;
749 };
750 
751 struct fuse_ioctl_in {
752 	uint64_t	fh;
753 	uint32_t	flags;
754 	uint32_t	cmd;
755 	uint64_t	arg;
756 	uint32_t	in_size;
757 	uint32_t	out_size;
758 };
759 
760 struct fuse_ioctl_iovec {
761 	uint64_t	base;
762 	uint64_t	len;
763 };
764 
765 struct fuse_ioctl_out {
766 	int32_t		result;
767 	uint32_t	flags;
768 	uint32_t	in_iovs;
769 	uint32_t	out_iovs;
770 };
771 
772 struct fuse_poll_in {
773 	uint64_t	fh;
774 	uint64_t	kh;
775 	uint32_t	flags;
776 	uint32_t	events;
777 };
778 
779 struct fuse_poll_out {
780 	uint32_t	revents;
781 	uint32_t	padding;
782 };
783 
784 struct fuse_notify_poll_wakeup_out {
785 	uint64_t	kh;
786 };
787 
788 struct fuse_fallocate_in {
789 	uint64_t	fh;
790 	uint64_t	offset;
791 	uint64_t	length;
792 	uint32_t	mode;
793 	uint32_t	padding;
794 };
795 
796 struct fuse_in_header {
797 	uint32_t	len;
798 	uint32_t	opcode;
799 	uint64_t	unique;
800 	uint64_t	nodeid;
801 	uint32_t	uid;
802 	uint32_t	gid;
803 	uint32_t	pid;
804 	uint32_t	padding;
805 };
806 
807 struct fuse_out_header {
808 	uint32_t	len;
809 	int32_t		error;
810 	uint64_t	unique;
811 };
812 
813 struct fuse_dirent {
814 	uint64_t	ino;
815 	uint64_t	off;
816 	uint32_t	namelen;
817 	uint32_t	type;
818 	char name[];
819 };
820 
821 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
822 #define FUSE_DIRENT_ALIGN(x) \
823 	(((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
824 #define FUSE_DIRENT_SIZE(d) \
825 	FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
826 
827 struct fuse_direntplus {
828 	struct fuse_entry_out entry_out;
829 	struct fuse_dirent dirent;
830 };
831 
832 #define FUSE_NAME_OFFSET_DIRENTPLUS \
833 	offsetof(struct fuse_direntplus, dirent.name)
834 #define FUSE_DIRENTPLUS_SIZE(d) \
835 	FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET_DIRENTPLUS + (d)->dirent.namelen)
836 
837 struct fuse_notify_inval_inode_out {
838 	uint64_t	ino;
839 	int64_t		off;
840 	int64_t		len;
841 };
842 
843 struct fuse_notify_inval_entry_out {
844 	uint64_t	parent;
845 	uint32_t	namelen;
846 	uint32_t	padding;
847 };
848 
849 struct fuse_notify_delete_out {
850 	uint64_t	parent;
851 	uint64_t	child;
852 	uint32_t	namelen;
853 	uint32_t	padding;
854 };
855 
856 struct fuse_notify_store_out {
857 	uint64_t	nodeid;
858 	uint64_t	offset;
859 	uint32_t	size;
860 	uint32_t	padding;
861 };
862 
863 struct fuse_notify_retrieve_out {
864 	uint64_t	notify_unique;
865 	uint64_t	nodeid;
866 	uint64_t	offset;
867 	uint32_t	size;
868 	uint32_t	padding;
869 };
870 
871 /* Matches the size of fuse_write_in */
872 struct fuse_notify_retrieve_in {
873 	uint64_t	dummy1;
874 	uint64_t	offset;
875 	uint32_t	size;
876 	uint32_t	dummy2;
877 	uint64_t	dummy3;
878 	uint64_t	dummy4;
879 };
880 
881 /* Device ioctls: */
882 #define FUSE_DEV_IOC_CLONE	_IOR(229, 0, uint32_t)
883 
884 struct fuse_lseek_in {
885 	uint64_t	fh;
886 	uint64_t	offset;
887 	uint32_t	whence;
888 	uint32_t	padding;
889 };
890 
891 struct fuse_lseek_out {
892 	uint64_t	offset;
893 };
894 
895 struct fuse_copy_file_range_in {
896 	uint64_t	fh_in;
897 	uint64_t	off_in;
898 	uint64_t	nodeid_out;
899 	uint64_t	fh_out;
900 	uint64_t	off_out;
901 	uint64_t	len;
902 	uint64_t	flags;
903 };
904 
905 #define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
906 #define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
907 struct fuse_setupmapping_in {
908 	/* An already open handle */
909 	uint64_t	fh;
910 	/* Offset into the file to start the mapping */
911 	uint64_t	foffset;
912 	/* Length of mapping required */
913 	uint64_t	len;
914 	/* Flags, FUSE_SETUPMAPPING_FLAG_* */
915 	uint64_t	flags;
916 	/* Offset in Memory Window */
917 	uint64_t	moffset;
918 };
919 
920 struct fuse_removemapping_in {
921 	/* number of fuse_removemapping_one follows */
922 	uint32_t        count;
923 };
924 
925 struct fuse_removemapping_one {
926 	/* Offset into the dax window start the unmapping */
927 	uint64_t        moffset;
928 	/* Length of mapping required */
929 	uint64_t	len;
930 };
931 
932 #define FUSE_REMOVEMAPPING_MAX_ENTRY   \
933 		(PAGE_SIZE / sizeof(struct fuse_removemapping_one))
934 
935 #endif /* _LINUX_FUSE_H */
936