2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
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
43 * - add retrieve notify
46 * - add BATCH_FORGET request
47 * - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct
48 * fuse_ioctl_iovec' instead of ambiguous 'struct iovec'
49 * - add FUSE_IOCTL_32BIT flag
52 * - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
55 * - add FUSE_IOCTL_DIR flag
56 * - add FUSE_NOTIFY_DELETE
62 #include <linux/types.h>
65 * Version negotiation:
67 * Both the kernel and userspace send the version they support in the
68 * INIT request and reply respectively.
70 * If the major versions match then both shall use the smallest
71 * of the two minor versions for communication.
73 * If the kernel supports a larger major version, then userspace shall
74 * reply with the major version it supports, ignore the rest of the
75 * INIT message and expect a new INIT message from the kernel with a
76 * matching major version.
78 * If the library supports a larger major version, then it shall fall
79 * back to the major protocol version sent by the kernel for
80 * communication and reply with that major version (and an arbitrary
81 * supported minor version).
84 /** Version number of this interface */
85 #define FUSE_KERNEL_VERSION 7
87 /** Minor version number of this interface */
88 #define FUSE_KERNEL_MINOR_VERSION 18
90 /** The node ID of the root inode */
91 #define FUSE_ROOT_ID 1
93 /* Make sure all structures are padded to 64bit boundary, so 32bit
94 userspace works under 64bit kernels */
115 struct fuse_kstatfs {
128 struct fuse_file_lock {
132 __u32 pid; /* tgid */
136 * Bitmasks for fuse_setattr_in.valid
138 #define FATTR_MODE (1 << 0)
139 #define FATTR_UID (1 << 1)
140 #define FATTR_GID (1 << 2)
141 #define FATTR_SIZE (1 << 3)
142 #define FATTR_ATIME (1 << 4)
143 #define FATTR_MTIME (1 << 5)
144 #define FATTR_FH (1 << 6)
145 #define FATTR_ATIME_NOW (1 << 7)
146 #define FATTR_MTIME_NOW (1 << 8)
147 #define FATTR_LOCKOWNER (1 << 9)
150 * Flags returned by the OPEN request
152 * FOPEN_DIRECT_IO: bypass page cache for this open file
153 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
154 * FOPEN_NONSEEKABLE: the file is not seekable
156 #define FOPEN_DIRECT_IO (1 << 0)
157 #define FOPEN_KEEP_CACHE (1 << 1)
158 #define FOPEN_NONSEEKABLE (1 << 2)
161 * INIT request/reply flags
163 * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
164 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
165 * FUSE_DONT_MASK: don't apply umask to file mode on create operations
166 * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
168 #define FUSE_ASYNC_READ (1 << 0)
169 #define FUSE_POSIX_LOCKS (1 << 1)
170 #define FUSE_FILE_OPS (1 << 2)
171 #define FUSE_ATOMIC_O_TRUNC (1 << 3)
172 #define FUSE_EXPORT_SUPPORT (1 << 4)
173 #define FUSE_BIG_WRITES (1 << 5)
174 #define FUSE_DONT_MASK (1 << 6)
175 #define FUSE_FLOCK_LOCKS (1 << 10)
178 * CUSE INIT request/reply flags
180 * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
182 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
187 #define FUSE_RELEASE_FLUSH (1 << 0)
188 #define FUSE_RELEASE_FLOCK_UNLOCK (1 << 1)
193 #define FUSE_GETATTR_FH (1 << 0)
198 #define FUSE_LK_FLOCK (1 << 0)
203 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
204 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
206 #define FUSE_WRITE_CACHE (1 << 0)
207 #define FUSE_WRITE_LOCKOWNER (1 << 1)
212 #define FUSE_READ_LOCKOWNER (1 << 1)
217 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
218 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
219 * FUSE_IOCTL_RETRY: retry with new iovecs
220 * FUSE_IOCTL_32BIT: 32bit ioctl
221 * FUSE_IOCTL_DIR: is a directory
223 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
225 #define FUSE_IOCTL_COMPAT (1 << 0)
226 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
227 #define FUSE_IOCTL_RETRY (1 << 2)
228 #define FUSE_IOCTL_32BIT (1 << 3)
229 #define FUSE_IOCTL_DIR (1 << 4)
231 #define FUSE_IOCTL_MAX_IOV 256
236 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
238 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
242 FUSE_FORGET = 2, /* no reply */
262 FUSE_REMOVEXATTR = 24,
267 FUSE_RELEASEDIR = 29,
279 FUSE_NOTIFY_REPLY = 41,
280 FUSE_BATCH_FORGET = 42,
282 /* CUSE specific operations */
286 enum fuse_notify_code {
287 FUSE_NOTIFY_POLL = 1,
288 FUSE_NOTIFY_INVAL_INODE = 2,
289 FUSE_NOTIFY_INVAL_ENTRY = 3,
290 FUSE_NOTIFY_STORE = 4,
291 FUSE_NOTIFY_RETRIEVE = 5,
292 FUSE_NOTIFY_DELETE = 6,
293 FUSE_NOTIFY_CODE_MAX,
296 /* The read buffer is required to be at least 8k, but may be much larger */
297 #define FUSE_MIN_READ_BUFFER 8192
299 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
301 struct fuse_entry_out {
302 __u64 nodeid; /* Inode ID */
303 __u64 generation; /* Inode generation: nodeid:gen must
304 be unique for the fs's lifetime */
305 __u64 entry_valid; /* Cache timeout for the name */
306 __u64 attr_valid; /* Cache timeout for the attributes */
307 __u32 entry_valid_nsec;
308 __u32 attr_valid_nsec;
309 struct fuse_attr attr;
312 struct fuse_forget_in {
316 struct fuse_forget_one {
321 struct fuse_batch_forget_in {
326 struct fuse_getattr_in {
332 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
334 struct fuse_attr_out {
335 __u64 attr_valid; /* Cache timeout for the attributes */
336 __u32 attr_valid_nsec;
338 struct fuse_attr attr;
341 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
343 struct fuse_mknod_in {
350 struct fuse_mkdir_in {
355 struct fuse_rename_in {
359 struct fuse_link_in {
363 struct fuse_setattr_in {
382 struct fuse_open_in {
387 struct fuse_create_in {
394 struct fuse_open_out {
400 struct fuse_release_in {
407 struct fuse_flush_in {
414 struct fuse_read_in {
424 #define FUSE_COMPAT_WRITE_IN_SIZE 24
426 struct fuse_write_in {
436 struct fuse_write_out {
441 #define FUSE_COMPAT_STATFS_SIZE 48
443 struct fuse_statfs_out {
444 struct fuse_kstatfs st;
447 struct fuse_fsync_in {
453 struct fuse_setxattr_in {
458 struct fuse_getxattr_in {
463 struct fuse_getxattr_out {
471 struct fuse_file_lock lk;
477 struct fuse_file_lock lk;
480 struct fuse_access_in {
485 struct fuse_init_in {
492 struct fuse_init_out {
497 __u16 max_background;
498 __u16 congestion_threshold;
502 #define CUSE_INIT_INFO_MAX 4096
504 struct cuse_init_in {
511 struct cuse_init_out {
518 __u32 dev_major; /* chardev major */
519 __u32 dev_minor; /* chardev minor */
523 struct fuse_interrupt_in {
527 struct fuse_bmap_in {
533 struct fuse_bmap_out {
537 struct fuse_ioctl_in {
546 struct fuse_ioctl_iovec {
551 struct fuse_ioctl_out {
558 struct fuse_poll_in {
565 struct fuse_poll_out {
570 struct fuse_notify_poll_wakeup_out {
574 struct fuse_in_header {
585 struct fuse_out_header {
599 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
600 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
601 #define FUSE_DIRENT_SIZE(d) \
602 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
604 struct fuse_notify_inval_inode_out {
610 struct fuse_notify_inval_entry_out {
616 struct fuse_notify_delete_out {
623 struct fuse_notify_store_out {
630 struct fuse_notify_retrieve_out {
638 /* Matches the size of fuse_write_in */
639 struct fuse_notify_retrieve_in {
648 #endif /* _LINUX_FUSE_H */