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
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
58 #include <linux/types.h>
61 * Version negotiation:
63 * Both the kernel and userspace send the version they support in the
64 * INIT request and reply respectively.
66 * If the major versions match then both shall use the smallest
67 * of the two minor versions for communication.
69 * If the kernel supports a larger major version, then userspace shall
70 * reply with the major version it supports, ignore the rest of the
71 * INIT message and expect a new INIT message from the kernel with a
72 * matching major version.
74 * If the library supports a larger major version, then it shall fall
75 * back to the major protocol version sent by the kernel for
76 * communication and reply with that major version (and an arbitrary
77 * supported minor version).
80 /** Version number of this interface */
81 #define FUSE_KERNEL_VERSION 7
83 /** Minor version number of this interface */
84 #define FUSE_KERNEL_MINOR_VERSION 17
86 /** The node ID of the root inode */
87 #define FUSE_ROOT_ID 1
89 /* Make sure all structures are padded to 64bit boundary, so 32bit
90 userspace works under 64bit kernels */
111 struct fuse_kstatfs {
124 struct fuse_file_lock {
128 __u32 pid; /* tgid */
132 * Bitmasks for fuse_setattr_in.valid
134 #define FATTR_MODE (1 << 0)
135 #define FATTR_UID (1 << 1)
136 #define FATTR_GID (1 << 2)
137 #define FATTR_SIZE (1 << 3)
138 #define FATTR_ATIME (1 << 4)
139 #define FATTR_MTIME (1 << 5)
140 #define FATTR_FH (1 << 6)
141 #define FATTR_ATIME_NOW (1 << 7)
142 #define FATTR_MTIME_NOW (1 << 8)
143 #define FATTR_LOCKOWNER (1 << 9)
146 * Flags returned by the OPEN request
148 * FOPEN_DIRECT_IO: bypass page cache for this open file
149 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
150 * FOPEN_NONSEEKABLE: the file is not seekable
152 #define FOPEN_DIRECT_IO (1 << 0)
153 #define FOPEN_KEEP_CACHE (1 << 1)
154 #define FOPEN_NONSEEKABLE (1 << 2)
157 * INIT request/reply flags
159 * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
160 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
161 * FUSE_DONT_MASK: don't apply umask to file mode on create operations
162 * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
164 #define FUSE_ASYNC_READ (1 << 0)
165 #define FUSE_POSIX_LOCKS (1 << 1)
166 #define FUSE_FILE_OPS (1 << 2)
167 #define FUSE_ATOMIC_O_TRUNC (1 << 3)
168 #define FUSE_EXPORT_SUPPORT (1 << 4)
169 #define FUSE_BIG_WRITES (1 << 5)
170 #define FUSE_DONT_MASK (1 << 6)
171 #define FUSE_FLOCK_LOCKS (1 << 10)
174 * CUSE INIT request/reply flags
176 * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
178 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
183 #define FUSE_RELEASE_FLUSH (1 << 0)
184 #define FUSE_RELEASE_FLOCK_UNLOCK (1 << 1)
189 #define FUSE_GETATTR_FH (1 << 0)
194 #define FUSE_LK_FLOCK (1 << 0)
199 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
200 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
202 #define FUSE_WRITE_CACHE (1 << 0)
203 #define FUSE_WRITE_LOCKOWNER (1 << 1)
208 #define FUSE_READ_LOCKOWNER (1 << 1)
213 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
214 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
215 * FUSE_IOCTL_RETRY: retry with new iovecs
216 * FUSE_IOCTL_32BIT: 32bit ioctl
218 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
220 #define FUSE_IOCTL_COMPAT (1 << 0)
221 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
222 #define FUSE_IOCTL_RETRY (1 << 2)
223 #define FUSE_IOCTL_32BIT (1 << 3)
225 #define FUSE_IOCTL_MAX_IOV 256
230 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
232 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
236 FUSE_FORGET = 2, /* no reply */
256 FUSE_REMOVEXATTR = 24,
261 FUSE_RELEASEDIR = 29,
273 FUSE_NOTIFY_REPLY = 41,
274 FUSE_BATCH_FORGET = 42,
276 /* CUSE specific operations */
280 enum fuse_notify_code {
281 FUSE_NOTIFY_POLL = 1,
282 FUSE_NOTIFY_INVAL_INODE = 2,
283 FUSE_NOTIFY_INVAL_ENTRY = 3,
284 FUSE_NOTIFY_STORE = 4,
285 FUSE_NOTIFY_RETRIEVE = 5,
286 FUSE_NOTIFY_CODE_MAX,
289 /* The read buffer is required to be at least 8k, but may be much larger */
290 #define FUSE_MIN_READ_BUFFER 8192
292 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
294 struct fuse_entry_out {
295 __u64 nodeid; /* Inode ID */
296 __u64 generation; /* Inode generation: nodeid:gen must
297 be unique for the fs's lifetime */
298 __u64 entry_valid; /* Cache timeout for the name */
299 __u64 attr_valid; /* Cache timeout for the attributes */
300 __u32 entry_valid_nsec;
301 __u32 attr_valid_nsec;
302 struct fuse_attr attr;
305 struct fuse_forget_in {
309 struct fuse_forget_one {
314 struct fuse_batch_forget_in {
319 struct fuse_getattr_in {
325 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
327 struct fuse_attr_out {
328 __u64 attr_valid; /* Cache timeout for the attributes */
329 __u32 attr_valid_nsec;
331 struct fuse_attr attr;
334 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
336 struct fuse_mknod_in {
343 struct fuse_mkdir_in {
348 struct fuse_rename_in {
352 struct fuse_link_in {
356 struct fuse_setattr_in {
375 struct fuse_open_in {
380 struct fuse_create_in {
387 struct fuse_open_out {
393 struct fuse_release_in {
400 struct fuse_flush_in {
407 struct fuse_read_in {
417 #define FUSE_COMPAT_WRITE_IN_SIZE 24
419 struct fuse_write_in {
429 struct fuse_write_out {
434 #define FUSE_COMPAT_STATFS_SIZE 48
436 struct fuse_statfs_out {
437 struct fuse_kstatfs st;
440 struct fuse_fsync_in {
446 struct fuse_setxattr_in {
451 struct fuse_getxattr_in {
456 struct fuse_getxattr_out {
464 struct fuse_file_lock lk;
470 struct fuse_file_lock lk;
473 struct fuse_access_in {
478 struct fuse_init_in {
485 struct fuse_init_out {
490 __u16 max_background;
491 __u16 congestion_threshold;
495 #define CUSE_INIT_INFO_MAX 4096
497 struct cuse_init_in {
504 struct cuse_init_out {
511 __u32 dev_major; /* chardev major */
512 __u32 dev_minor; /* chardev minor */
516 struct fuse_interrupt_in {
520 struct fuse_bmap_in {
526 struct fuse_bmap_out {
530 struct fuse_ioctl_in {
539 struct fuse_ioctl_iovec {
544 struct fuse_ioctl_out {
551 struct fuse_poll_in {
558 struct fuse_poll_out {
563 struct fuse_notify_poll_wakeup_out {
567 struct fuse_in_header {
578 struct fuse_out_header {
592 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
593 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
594 #define FUSE_DIRENT_SIZE(d) \
595 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
597 struct fuse_notify_inval_inode_out {
603 struct fuse_notify_inval_entry_out {
609 struct fuse_notify_store_out {
616 struct fuse_notify_retrieve_out {
624 /* Matches the size of fuse_write_in */
625 struct fuse_notify_retrieve_in {
634 #endif /* _LINUX_FUSE_H */