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
55 #include <linux/types.h>
58 * Version negotiation:
60 * Both the kernel and userspace send the version they support in the
61 * INIT request and reply respectively.
63 * If the major versions match then both shall use the smallest
64 * of the two minor versions for communication.
66 * If the kernel supports a larger major version, then userspace shall
67 * reply with the major version it supports, ignore the rest of the
68 * INIT message and expect a new INIT message from the kernel with a
69 * matching major version.
71 * If the library supports a larger major version, then it shall fall
72 * back to the major protocol version sent by the kernel for
73 * communication and reply with that major version (and an arbitrary
74 * supported minor version).
77 /** Version number of this interface */
78 #define FUSE_KERNEL_VERSION 7
80 /** Minor version number of this interface */
81 #define FUSE_KERNEL_MINOR_VERSION 16
83 /** The node ID of the root inode */
84 #define FUSE_ROOT_ID 1
86 /* Make sure all structures are padded to 64bit boundary, so 32bit
87 userspace works under 64bit kernels */
108 struct fuse_kstatfs {
121 struct fuse_file_lock {
125 __u32 pid; /* tgid */
129 * Bitmasks for fuse_setattr_in.valid
131 #define FATTR_MODE (1 << 0)
132 #define FATTR_UID (1 << 1)
133 #define FATTR_GID (1 << 2)
134 #define FATTR_SIZE (1 << 3)
135 #define FATTR_ATIME (1 << 4)
136 #define FATTR_MTIME (1 << 5)
137 #define FATTR_FH (1 << 6)
138 #define FATTR_ATIME_NOW (1 << 7)
139 #define FATTR_MTIME_NOW (1 << 8)
140 #define FATTR_LOCKOWNER (1 << 9)
143 * Flags returned by the OPEN request
145 * FOPEN_DIRECT_IO: bypass page cache for this open file
146 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
147 * FOPEN_NONSEEKABLE: the file is not seekable
149 #define FOPEN_DIRECT_IO (1 << 0)
150 #define FOPEN_KEEP_CACHE (1 << 1)
151 #define FOPEN_NONSEEKABLE (1 << 2)
154 * INIT request/reply flags
156 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
157 * FUSE_DONT_MASK: don't apply umask to file mode on create operations
159 #define FUSE_ASYNC_READ (1 << 0)
160 #define FUSE_POSIX_LOCKS (1 << 1)
161 #define FUSE_FILE_OPS (1 << 2)
162 #define FUSE_ATOMIC_O_TRUNC (1 << 3)
163 #define FUSE_EXPORT_SUPPORT (1 << 4)
164 #define FUSE_BIG_WRITES (1 << 5)
165 #define FUSE_DONT_MASK (1 << 6)
168 * CUSE INIT request/reply flags
170 * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
172 #define CUSE_UNRESTRICTED_IOCTL (1 << 0)
177 #define FUSE_RELEASE_FLUSH (1 << 0)
182 #define FUSE_GETATTR_FH (1 << 0)
187 #define FUSE_LK_FLOCK (1 << 0)
192 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
193 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
195 #define FUSE_WRITE_CACHE (1 << 0)
196 #define FUSE_WRITE_LOCKOWNER (1 << 1)
201 #define FUSE_READ_LOCKOWNER (1 << 1)
206 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
207 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
208 * FUSE_IOCTL_RETRY: retry with new iovecs
209 * FUSE_IOCTL_32BIT: 32bit ioctl
211 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
213 #define FUSE_IOCTL_COMPAT (1 << 0)
214 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
215 #define FUSE_IOCTL_RETRY (1 << 2)
216 #define FUSE_IOCTL_32BIT (1 << 3)
218 #define FUSE_IOCTL_MAX_IOV 256
223 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
225 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
229 FUSE_FORGET = 2, /* no reply */
249 FUSE_REMOVEXATTR = 24,
254 FUSE_RELEASEDIR = 29,
266 FUSE_NOTIFY_REPLY = 41,
267 FUSE_BATCH_FORGET = 42,
269 /* CUSE specific operations */
273 enum fuse_notify_code {
274 FUSE_NOTIFY_POLL = 1,
275 FUSE_NOTIFY_INVAL_INODE = 2,
276 FUSE_NOTIFY_INVAL_ENTRY = 3,
277 FUSE_NOTIFY_STORE = 4,
278 FUSE_NOTIFY_RETRIEVE = 5,
279 FUSE_NOTIFY_CODE_MAX,
282 /* The read buffer is required to be at least 8k, but may be much larger */
283 #define FUSE_MIN_READ_BUFFER 8192
285 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120
287 struct fuse_entry_out {
288 __u64 nodeid; /* Inode ID */
289 __u64 generation; /* Inode generation: nodeid:gen must
290 be unique for the fs's lifetime */
291 __u64 entry_valid; /* Cache timeout for the name */
292 __u64 attr_valid; /* Cache timeout for the attributes */
293 __u32 entry_valid_nsec;
294 __u32 attr_valid_nsec;
295 struct fuse_attr attr;
298 struct fuse_forget_in {
302 struct fuse_forget_one {
307 struct fuse_batch_forget_in {
312 struct fuse_getattr_in {
318 #define FUSE_COMPAT_ATTR_OUT_SIZE 96
320 struct fuse_attr_out {
321 __u64 attr_valid; /* Cache timeout for the attributes */
322 __u32 attr_valid_nsec;
324 struct fuse_attr attr;
327 #define FUSE_COMPAT_MKNOD_IN_SIZE 8
329 struct fuse_mknod_in {
336 struct fuse_mkdir_in {
341 struct fuse_rename_in {
345 struct fuse_link_in {
349 struct fuse_setattr_in {
368 struct fuse_open_in {
373 struct fuse_create_in {
380 struct fuse_open_out {
386 struct fuse_release_in {
393 struct fuse_flush_in {
400 struct fuse_read_in {
410 #define FUSE_COMPAT_WRITE_IN_SIZE 24
412 struct fuse_write_in {
422 struct fuse_write_out {
427 #define FUSE_COMPAT_STATFS_SIZE 48
429 struct fuse_statfs_out {
430 struct fuse_kstatfs st;
433 struct fuse_fsync_in {
439 struct fuse_setxattr_in {
444 struct fuse_getxattr_in {
449 struct fuse_getxattr_out {
457 struct fuse_file_lock lk;
463 struct fuse_file_lock lk;
466 struct fuse_access_in {
471 struct fuse_init_in {
478 struct fuse_init_out {
483 __u16 max_background;
484 __u16 congestion_threshold;
488 #define CUSE_INIT_INFO_MAX 4096
490 struct cuse_init_in {
497 struct cuse_init_out {
504 __u32 dev_major; /* chardev major */
505 __u32 dev_minor; /* chardev minor */
509 struct fuse_interrupt_in {
513 struct fuse_bmap_in {
519 struct fuse_bmap_out {
523 struct fuse_ioctl_in {
532 struct fuse_ioctl_iovec {
537 struct fuse_ioctl_out {
544 struct fuse_poll_in {
551 struct fuse_poll_out {
556 struct fuse_notify_poll_wakeup_out {
560 struct fuse_in_header {
571 struct fuse_out_header {
585 #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
586 #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
587 #define FUSE_DIRENT_SIZE(d) \
588 FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
590 struct fuse_notify_inval_inode_out {
596 struct fuse_notify_inval_entry_out {
602 struct fuse_notify_store_out {
609 struct fuse_notify_retrieve_out {
617 /* Matches the size of fuse_write_in */
618 struct fuse_notify_retrieve_in {
627 #endif /* _LINUX_FUSE_H */