2 FUSE: Filesystem in Userspace
5 This program can be distributed under the terms of the GNU GPL.
10 * This file defines the kernel interface of FUSE
15 * - new fuse_getattr_in input argument of GETATTR
16 * - add lk_flags in fuse_lk_in
17 * - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
18 * - add blksize field to fuse_attr
19 * - add file flags field to fuse_read_in and fuse_write_in
22 * - add nonseekable open flag
26 * - add unsolicited notification support
27 * - add POLL message and NOTIFY_POLL notification
30 * - add umask flag to input argument of open, mknod and mkdir
31 * - add notification messages for invalidation of inodes and
35 * - make max number of background requests and congestion threshold
39 * - add splice support to fuse device
45 #include <linux/types.h>
48 * Version negotiation:
50 * Both the kernel and userspace send the version they support in the
51 * INIT request and reply respectively.
53 * If the major versions match then both shall use the smallest
54 * of the two minor versions for communication.
56 * If the kernel supports a larger major version, then userspace shall
57 * reply with the major version it supports, ignore the rest of the
58 * INIT message and expect a new INIT message from the kernel with a
59 * matching major version.
61 * If the library supports a larger major version, then it shall fall
62 * back to the major protocol version sent by the kernel for
63 * communication and reply with that major version (and an arbitrary
64 * supported minor version).
67 /** Version number of this interface */
68 #define FUSE_KERNEL_VERSION 7
70 /** Minor version number of this interface */
71 #define FUSE_KERNEL_MINOR_VERSION 14
73 /** The node ID of the root inode */
74 #define FUSE_ROOT_ID 1
76 /* Make sure all structures are padded to 64bit boundary, so 32bit
77 userspace works under 64bit kernels */
111 struct fuse_file_lock {
115 __u32 pid; /* tgid */
119 * Bitmasks for fuse_setattr_in.valid
121 #define FATTR_MODE (1 << 0)
122 #define FATTR_UID (1 << 1)
123 #define FATTR_GID (1 << 2)
124 #define FATTR_SIZE (1 << 3)
125 #define FATTR_ATIME (1 << 4)
126 #define FATTR_MTIME (1 << 5)
127 #define FATTR_FH (1 << 6)
128 #define FATTR_ATIME_NOW (1 << 7)
129 #define FATTR_MTIME_NOW (1 << 8)
130 #define FATTR_LOCKOWNER (1 << 9)
133 * Flags returned by the OPEN request
135 * FOPEN_DIRECT_IO: bypass page cache for this open file
136 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
137 * FOPEN_NONSEEKABLE: the file is not seekable
139 #define FOPEN_DIRECT_IO (1 << 0)
140 #define FOPEN_KEEP_CACHE (1 << 1)
141 #define FOPEN_NONSEEKABLE (1 << 2)
144 * INIT request/reply flags
146 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
147 * FUSE_DONT_MASK: don't apply umask to file mode on create operations
149 #define FUSE_ASYNC_READ (1 << 0)
150 #define FUSE_POSIX_LOCKS (1 << 1)
151 #define FUSE_FILE_OPS (1 << 2)
152 #define FUSE_ATOMIC_O_TRUNC (1 << 3)
153 #define FUSE_EXPORT_SUPPORT (1 << 4)
154 #define FUSE_BIG_WRITES (1 << 5)
155 #define FUSE_DONT_MASK (1 << 6)
158 * CUSE INIT request/reply flags
160 * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
162 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
167 #define FUSE_RELEASE_FLUSH (1 << 0)
172 #define FUSE_GETATTR_FH (1 << 0)
177 #define FUSE_LK_FLOCK (1 << 0)
182 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
183 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
185 #define FUSE_WRITE_CACHE (1 << 0)
186 #define FUSE_WRITE_LOCKOWNER (1 << 1)
191 #define FUSE_READ_LOCKOWNER (1 << 1)
196 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
197 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
198 * FUSE_IOCTL_RETRY: retry with new iovecs
200 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
202 #define FUSE_IOCTL_COMPAT (1 << 0)
203 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
204 #define FUSE_IOCTL_RETRY (1 << 2)
206 #define FUSE_IOCTL_MAX_IOV 256
211 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
213 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
217 FUSE_FORGET = 2, /* no reply */
237 FUSE_REMOVEXATTR = 24,
242 FUSE_RELEASEDIR = 29,
255 /* CUSE specific operations */
259 enum fuse_notify_code {
260 FUSE_NOTIFY_POLL = 1,
261 FUSE_NOTIFY_INVAL_INODE = 2,
262 FUSE_NOTIFY_INVAL_ENTRY = 3,
263 FUSE_NOTIFY_CODE_MAX,
266 /* The read buffer is required to be at least 8k, but may be much larger */
267 #define FUSE_MIN_READ_BUFFER 8192
269 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
271 struct fuse_entry_out {
272 __u64 nodeid; /* Inode ID */
273 __u64 generation; /* Inode generation: nodeid:gen must
274 be unique for the fs's lifetime */
275 __u64 entry_valid; /* Cache timeout for the name */
276 __u64 attr_valid; /* Cache timeout for the attributes */
277 __u32 entry_valid_nsec;
278 __u32 attr_valid_nsec;
279 struct fuse_attr attr;
282 struct fuse_forget_in {
286 struct fuse_getattr_in {
292 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
294 struct fuse_attr_out {
295 __u64 attr_valid; /* Cache timeout for the attributes */
296 __u32 attr_valid_nsec;
298 struct fuse_attr attr;
301 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
303 struct fuse_mknod_in {
310 struct fuse_mkdir_in {
315 struct fuse_rename_in {
319 struct fuse_link_in {
323 struct fuse_setattr_in {
342 struct fuse_open_in {
347 struct fuse_create_in {
354 struct fuse_open_out {
360 struct fuse_release_in {
367 struct fuse_flush_in {
374 struct fuse_read_in {
384 #define FUSE_COMPAT_WRITE_IN_SIZE 24
386 struct fuse_write_in {
396 struct fuse_write_out {
401 #define FUSE_COMPAT_STATFS_SIZE 48
403 struct fuse_statfs_out {
404 struct fuse_kstatfs st;
407 struct fuse_fsync_in {
413 struct fuse_setxattr_in {
418 struct fuse_getxattr_in {
423 struct fuse_getxattr_out {
431 struct fuse_file_lock lk;
437 struct fuse_file_lock lk;
440 struct fuse_access_in {
445 struct fuse_init_in {
452 struct fuse_init_out {
457 __u16 max_background;
458 __u16 congestion_threshold;
462 #define CUSE_INIT_INFO_MAX 4096
464 struct cuse_init_in {
471 struct cuse_init_out {
478 __u32 dev_major; /* chardev major */
479 __u32 dev_minor; /* chardev minor */
483 struct fuse_interrupt_in {
487 struct fuse_bmap_in {
493 struct fuse_bmap_out {
497 struct fuse_ioctl_in {
506 struct fuse_ioctl_out {
513 struct fuse_poll_in {
520 struct fuse_poll_out {
525 struct fuse_notify_poll_wakeup_out {
529 struct fuse_in_header {
540 struct fuse_out_header {
554 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
555 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
556 #define FUSE_DIRENT_SIZE(d) \
557 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
559 struct fuse_notify_inval_inode_out {
565 struct fuse_notify_inval_entry_out {
571 #endif /* _LINUX_FUSE_H */