2 This file defines the kernel interface of FUSE
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
5 This program can be distributed under the terms of the GNU GPL.
8 This -- and only this -- header file may also be distributed under
9 the terms of the BSD Licence as follows:
11 Copyright (C) 2001-2007 Miklos Szeredi. All rights reserved.
13 Redistribution and use in source and binary forms, with or without
14 modification, are permitted provided that the following conditions
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.
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
36 * This file defines the kernel interface of FUSE
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
48 * - add nonseekable open flag
52 * - add unsolicited notification support
53 * - add POLL message and NOTIFY_POLL notification
56 * - add umask flag to input argument of open, mknod and mkdir
57 * - add notification messages for invalidation of inodes and
61 * - make max number of background requests and congestion threshold
65 * - add splice support to fuse device
69 * - add retrieve notify
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
78 * - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
81 * - add FUSE_IOCTL_DIR flag
82 * - add FUSE_NOTIFY_DELETE
88 #include <sys/types.h>
89 #define __u64 uint64_t
91 #define __u32 uint32_t
93 #define __u16 uint16_t
96 * Version negotiation:
98 * Both the kernel and userspace send the version they support in the
99 * INIT request and reply respectively.
101 * If the major versions match then both shall use the smallest
102 * of the two minor versions for communication.
104 * If the kernel supports a larger major version, then userspace shall
105 * reply with the major version it supports, ignore the rest of the
106 * INIT message and expect a new INIT message from the kernel with a
107 * matching major version.
109 * If the library supports a larger major version, then it shall fall
110 * back to the major protocol version sent by the kernel for
111 * communication and reply with that major version (and an arbitrary
112 * supported minor version).
115 /** Version number of this interface */
116 #define FUSE_KERNEL_VERSION 7
118 /** Minor version number of this interface */
119 #define FUSE_KERNEL_MINOR_VERSION 18
121 /** The node ID of the root inode */
122 #define FUSE_ROOT_ID 1
124 /* Make sure all structures are padded to 64bit boundary, so 32bit
125 userspace works under 64bit kernels */
146 struct fuse_kstatfs {
159 struct fuse_file_lock {
163 __u32 pid; /* tgid */
167 * Bitmasks for fuse_setattr_in.valid
169 #define FATTR_MODE (1 << 0)
170 #define FATTR_UID (1 << 1)
171 #define FATTR_GID (1 << 2)
172 #define FATTR_SIZE (1 << 3)
173 #define FATTR_ATIME (1 << 4)
174 #define FATTR_MTIME (1 << 5)
175 #define FATTR_FH (1 << 6)
176 #define FATTR_ATIME_NOW (1 << 7)
177 #define FATTR_MTIME_NOW (1 << 8)
178 #define FATTR_LOCKOWNER (1 << 9)
181 * Flags returned by the OPEN request
183 * FOPEN_DIRECT_IO: bypass page cache for this open file
184 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
185 * FOPEN_NONSEEKABLE: the file is not seekable
187 #define FOPEN_DIRECT_IO (1 << 0)
188 #define FOPEN_KEEP_CACHE (1 << 1)
189 #define FOPEN_NONSEEKABLE (1 << 2)
192 * INIT request/reply flags
194 * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
195 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
196 * FUSE_DONT_MASK: don't apply umask to file mode on create operations
197 * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
199 #define FUSE_ASYNC_READ (1 << 0)
200 #define FUSE_POSIX_LOCKS (1 << 1)
201 #define FUSE_FILE_OPS (1 << 2)
202 #define FUSE_ATOMIC_O_TRUNC (1 << 3)
203 #define FUSE_EXPORT_SUPPORT (1 << 4)
204 #define FUSE_BIG_WRITES (1 << 5)
205 #define FUSE_DONT_MASK (1 << 6)
206 #define FUSE_FLOCK_LOCKS (1 << 10)
209 * CUSE INIT request/reply flags
211 * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
213 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
218 #define FUSE_RELEASE_FLUSH (1 << 0)
219 #define FUSE_RELEASE_FLOCK_UNLOCK (1 << 1)
224 #define FUSE_GETATTR_FH (1 << 0)
229 #define FUSE_LK_FLOCK (1 << 0)
234 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
235 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
237 #define FUSE_WRITE_CACHE (1 << 0)
238 #define FUSE_WRITE_LOCKOWNER (1 << 1)
243 #define FUSE_READ_LOCKOWNER (1 << 1)
248 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
249 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
250 * FUSE_IOCTL_RETRY: retry with new iovecs
251 * FUSE_IOCTL_32BIT: 32bit ioctl
252 * FUSE_IOCTL_DIR: is a directory
254 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
256 #define FUSE_IOCTL_COMPAT (1 << 0)
257 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
258 #define FUSE_IOCTL_RETRY (1 << 2)
259 #define FUSE_IOCTL_32BIT (1 << 3)
260 #define FUSE_IOCTL_DIR (1 << 4)
262 #define FUSE_IOCTL_MAX_IOV 256
267 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
269 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
273 FUSE_FORGET = 2, /* no reply */
293 FUSE_REMOVEXATTR = 24,
298 FUSE_RELEASEDIR = 29,
310 FUSE_NOTIFY_REPLY = 41,
311 FUSE_BATCH_FORGET = 42,
313 /* CUSE specific operations */
317 enum fuse_notify_code {
318 FUSE_NOTIFY_POLL = 1,
319 FUSE_NOTIFY_INVAL_INODE = 2,
320 FUSE_NOTIFY_INVAL_ENTRY = 3,
321 FUSE_NOTIFY_STORE = 4,
322 FUSE_NOTIFY_RETRIEVE = 5,
323 FUSE_NOTIFY_DELETE = 6,
324 FUSE_NOTIFY_CODE_MAX,
327 /* The read buffer is required to be at least 8k, but may be much larger */
328 #define FUSE_MIN_READ_BUFFER 8192
330 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
332 struct fuse_entry_out {
333 __u64 nodeid; /* Inode ID */
334 __u64 generation; /* Inode generation: nodeid:gen must
335 be unique for the fs's lifetime */
336 __u64 entry_valid; /* Cache timeout for the name */
337 __u64 attr_valid; /* Cache timeout for the attributes */
338 __u32 entry_valid_nsec;
339 __u32 attr_valid_nsec;
340 struct fuse_attr attr;
343 struct fuse_forget_in {
347 struct fuse_forget_one {
352 struct fuse_batch_forget_in {
357 struct fuse_getattr_in {
363 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
365 struct fuse_attr_out {
366 __u64 attr_valid; /* Cache timeout for the attributes */
367 __u32 attr_valid_nsec;
369 struct fuse_attr attr;
372 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
374 struct fuse_mknod_in {
381 struct fuse_mkdir_in {
386 struct fuse_rename_in {
390 struct fuse_link_in {
394 struct fuse_setattr_in {
413 struct fuse_open_in {
418 struct fuse_create_in {
425 struct fuse_open_out {
431 struct fuse_release_in {
438 struct fuse_flush_in {
445 struct fuse_read_in {
455 #define FUSE_COMPAT_WRITE_IN_SIZE 24
457 struct fuse_write_in {
467 struct fuse_write_out {
472 #define FUSE_COMPAT_STATFS_SIZE 48
474 struct fuse_statfs_out {
475 struct fuse_kstatfs st;
478 struct fuse_fsync_in {
484 struct fuse_setxattr_in {
489 struct fuse_getxattr_in {
494 struct fuse_getxattr_out {
502 struct fuse_file_lock lk;
508 struct fuse_file_lock lk;
511 struct fuse_access_in {
516 struct fuse_init_in {
523 struct fuse_init_out {
528 __u16 max_background;
529 __u16 congestion_threshold;
533 #define CUSE_INIT_INFO_MAX 4096
535 struct cuse_init_in {
542 struct cuse_init_out {
549 __u32 dev_major; /* chardev major */
550 __u32 dev_minor; /* chardev minor */
554 struct fuse_interrupt_in {
558 struct fuse_bmap_in {
564 struct fuse_bmap_out {
568 struct fuse_ioctl_in {
577 struct fuse_ioctl_iovec {
582 struct fuse_ioctl_out {
589 struct fuse_poll_in {
596 struct fuse_poll_out {
601 struct fuse_notify_poll_wakeup_out {
605 struct fuse_in_header {
616 struct fuse_out_header {
630 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
631 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
632 #define FUSE_DIRENT_SIZE(d) \
633 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
635 struct fuse_notify_inval_inode_out {
641 struct fuse_notify_inval_entry_out {
647 struct fuse_notify_delete_out {
654 struct fuse_notify_store_out {
661 struct fuse_notify_retrieve_out {
669 /* Matches the size of fuse_write_in */
670 struct fuse_notify_retrieve_in {
679 #endif /* _LINUX_FUSE_H */