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37d217f029
Clarify how the protocol version should be negotiated between kernel and userspace. Notably libfuse didn't correctly handle the case when the supported major versions didn't match. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
569 lines
10 KiB
C
569 lines
10 KiB
C
/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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*/
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/*
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* This file defines the kernel interface of FUSE
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*
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* Protocol changelog:
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*
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* 7.9:
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* - new fuse_getattr_in input argument of GETATTR
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* - add lk_flags in fuse_lk_in
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* - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
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* - add blksize field to fuse_attr
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* - add file flags field to fuse_read_in and fuse_write_in
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*
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* 7.10
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* - add nonseekable open flag
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*
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* 7.11
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* - add IOCTL message
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* - add unsolicited notification support
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* - add POLL message and NOTIFY_POLL notification
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*
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* 7.12
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* - add umask flag to input argument of open, mknod and mkdir
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* - add notification messages for invalidation of inodes and
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* directory entries
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*
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* 7.13
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* - make max number of background requests and congestion threshold
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* tunables
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*/
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#ifndef _LINUX_FUSE_H
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#define _LINUX_FUSE_H
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#include <linux/types.h>
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/*
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* Version negotiation:
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*
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* Both the kernel and userspace send the version they support in the
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* INIT request and reply respectively.
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*
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* If the major versions match then both shall use the smallest
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* of the two minor versions for communication.
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*
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* If the kernel supports a larger major version, then userspace shall
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* reply with the major version it supports, ignore the rest of the
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* INIT message and expect a new INIT message from the kernel with a
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* matching major version.
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*
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* If the library supports a larger major version, then it shall fall
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* back to the major protocol version sent by the kernel for
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* communication and reply with that major version (and an arbitrary
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* supported minor version).
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*/
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/** Version number of this interface */
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#define FUSE_KERNEL_VERSION 7
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/** Minor version number of this interface */
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#define FUSE_KERNEL_MINOR_VERSION 13
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/** The node ID of the root inode */
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#define FUSE_ROOT_ID 1
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/* Make sure all structures are padded to 64bit boundary, so 32bit
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userspace works under 64bit kernels */
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struct fuse_attr {
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__u64 ino;
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__u64 size;
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__u64 blocks;
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__u64 atime;
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__u64 mtime;
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__u64 ctime;
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__u32 atimensec;
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__u32 mtimensec;
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__u32 ctimensec;
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__u32 mode;
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__u32 nlink;
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__u32 uid;
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__u32 gid;
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__u32 rdev;
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__u32 blksize;
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__u32 padding;
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};
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struct fuse_kstatfs {
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__u64 blocks;
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__u64 bfree;
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__u64 bavail;
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__u64 files;
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__u64 ffree;
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__u32 bsize;
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__u32 namelen;
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__u32 frsize;
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__u32 padding;
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__u32 spare[6];
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};
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struct fuse_file_lock {
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__u64 start;
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__u64 end;
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__u32 type;
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__u32 pid; /* tgid */
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};
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/**
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* Bitmasks for fuse_setattr_in.valid
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*/
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#define FATTR_MODE (1 << 0)
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#define FATTR_UID (1 << 1)
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#define FATTR_GID (1 << 2)
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#define FATTR_SIZE (1 << 3)
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#define FATTR_ATIME (1 << 4)
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#define FATTR_MTIME (1 << 5)
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#define FATTR_FH (1 << 6)
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#define FATTR_ATIME_NOW (1 << 7)
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#define FATTR_MTIME_NOW (1 << 8)
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#define FATTR_LOCKOWNER (1 << 9)
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/**
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* Flags returned by the OPEN request
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*
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* FOPEN_DIRECT_IO: bypass page cache for this open file
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* FOPEN_KEEP_CACHE: don't invalidate the data cache on open
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* FOPEN_NONSEEKABLE: the file is not seekable
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*/
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#define FOPEN_DIRECT_IO (1 << 0)
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#define FOPEN_KEEP_CACHE (1 << 1)
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#define FOPEN_NONSEEKABLE (1 << 2)
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/**
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* INIT request/reply flags
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*
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* FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
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* FUSE_DONT_MASK: don't apply umask to file mode on create operations
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*/
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#define FUSE_ASYNC_READ (1 << 0)
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#define FUSE_POSIX_LOCKS (1 << 1)
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#define FUSE_FILE_OPS (1 << 2)
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#define FUSE_ATOMIC_O_TRUNC (1 << 3)
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#define FUSE_EXPORT_SUPPORT (1 << 4)
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#define FUSE_BIG_WRITES (1 << 5)
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#define FUSE_DONT_MASK (1 << 6)
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/**
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* CUSE INIT request/reply flags
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*
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* CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
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*/
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#define CUSE_UNRESTRICTED_IOCTL (1 << 0)
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/**
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* Release flags
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*/
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#define FUSE_RELEASE_FLUSH (1 << 0)
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/**
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* Getattr flags
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*/
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#define FUSE_GETATTR_FH (1 << 0)
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/**
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* Lock flags
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*/
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#define FUSE_LK_FLOCK (1 << 0)
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/**
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* WRITE flags
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*
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* FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
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* FUSE_WRITE_LOCKOWNER: lock_owner field is valid
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*/
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#define FUSE_WRITE_CACHE (1 << 0)
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#define FUSE_WRITE_LOCKOWNER (1 << 1)
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/**
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* Read flags
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*/
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#define FUSE_READ_LOCKOWNER (1 << 1)
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/**
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* Ioctl flags
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*
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* FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
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* FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
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* FUSE_IOCTL_RETRY: retry with new iovecs
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*
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* FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
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*/
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#define FUSE_IOCTL_COMPAT (1 << 0)
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#define FUSE_IOCTL_UNRESTRICTED (1 << 1)
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#define FUSE_IOCTL_RETRY (1 << 2)
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#define FUSE_IOCTL_MAX_IOV 256
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/**
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* Poll flags
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*
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* FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
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*/
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#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
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enum fuse_opcode {
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FUSE_LOOKUP = 1,
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FUSE_FORGET = 2, /* no reply */
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FUSE_GETATTR = 3,
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FUSE_SETATTR = 4,
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FUSE_READLINK = 5,
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FUSE_SYMLINK = 6,
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FUSE_MKNOD = 8,
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FUSE_MKDIR = 9,
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FUSE_UNLINK = 10,
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FUSE_RMDIR = 11,
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FUSE_RENAME = 12,
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FUSE_LINK = 13,
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FUSE_OPEN = 14,
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FUSE_READ = 15,
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FUSE_WRITE = 16,
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FUSE_STATFS = 17,
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FUSE_RELEASE = 18,
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FUSE_FSYNC = 20,
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FUSE_SETXATTR = 21,
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FUSE_GETXATTR = 22,
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FUSE_LISTXATTR = 23,
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FUSE_REMOVEXATTR = 24,
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FUSE_FLUSH = 25,
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FUSE_INIT = 26,
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FUSE_OPENDIR = 27,
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FUSE_READDIR = 28,
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FUSE_RELEASEDIR = 29,
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FUSE_FSYNCDIR = 30,
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FUSE_GETLK = 31,
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FUSE_SETLK = 32,
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FUSE_SETLKW = 33,
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FUSE_ACCESS = 34,
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FUSE_CREATE = 35,
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FUSE_INTERRUPT = 36,
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FUSE_BMAP = 37,
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FUSE_DESTROY = 38,
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FUSE_IOCTL = 39,
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FUSE_POLL = 40,
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/* CUSE specific operations */
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CUSE_INIT = 4096,
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};
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enum fuse_notify_code {
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FUSE_NOTIFY_POLL = 1,
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FUSE_NOTIFY_INVAL_INODE = 2,
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FUSE_NOTIFY_INVAL_ENTRY = 3,
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FUSE_NOTIFY_CODE_MAX,
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};
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/* The read buffer is required to be at least 8k, but may be much larger */
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#define FUSE_MIN_READ_BUFFER 8192
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#define FUSE_COMPAT_ENTRY_OUT_SIZE 120
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struct fuse_entry_out {
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__u64 nodeid; /* Inode ID */
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__u64 generation; /* Inode generation: nodeid:gen must
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be unique for the fs's lifetime */
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__u64 entry_valid; /* Cache timeout for the name */
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__u64 attr_valid; /* Cache timeout for the attributes */
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__u32 entry_valid_nsec;
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__u32 attr_valid_nsec;
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struct fuse_attr attr;
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};
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struct fuse_forget_in {
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__u64 nlookup;
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};
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struct fuse_getattr_in {
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__u32 getattr_flags;
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__u32 dummy;
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__u64 fh;
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};
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#define FUSE_COMPAT_ATTR_OUT_SIZE 96
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struct fuse_attr_out {
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__u64 attr_valid; /* Cache timeout for the attributes */
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__u32 attr_valid_nsec;
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__u32 dummy;
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struct fuse_attr attr;
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};
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#define FUSE_COMPAT_MKNOD_IN_SIZE 8
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struct fuse_mknod_in {
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__u32 mode;
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__u32 rdev;
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__u32 umask;
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__u32 padding;
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};
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struct fuse_mkdir_in {
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__u32 mode;
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__u32 umask;
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};
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struct fuse_rename_in {
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__u64 newdir;
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};
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struct fuse_link_in {
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__u64 oldnodeid;
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};
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struct fuse_setattr_in {
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__u32 valid;
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__u32 padding;
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__u64 fh;
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__u64 size;
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__u64 lock_owner;
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__u64 atime;
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__u64 mtime;
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__u64 unused2;
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__u32 atimensec;
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__u32 mtimensec;
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__u32 unused3;
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__u32 mode;
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__u32 unused4;
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__u32 uid;
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__u32 gid;
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__u32 unused5;
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};
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struct fuse_open_in {
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__u32 flags;
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__u32 unused;
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};
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struct fuse_create_in {
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__u32 flags;
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__u32 mode;
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__u32 umask;
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__u32 padding;
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};
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struct fuse_open_out {
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__u64 fh;
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__u32 open_flags;
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__u32 padding;
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};
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struct fuse_release_in {
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__u64 fh;
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__u32 flags;
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__u32 release_flags;
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__u64 lock_owner;
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};
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struct fuse_flush_in {
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__u64 fh;
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__u32 unused;
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__u32 padding;
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__u64 lock_owner;
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};
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struct fuse_read_in {
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__u64 fh;
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__u64 offset;
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__u32 size;
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__u32 read_flags;
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__u64 lock_owner;
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__u32 flags;
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__u32 padding;
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};
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#define FUSE_COMPAT_WRITE_IN_SIZE 24
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struct fuse_write_in {
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__u64 fh;
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__u64 offset;
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__u32 size;
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__u32 write_flags;
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__u64 lock_owner;
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__u32 flags;
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__u32 padding;
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};
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struct fuse_write_out {
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__u32 size;
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__u32 padding;
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};
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#define FUSE_COMPAT_STATFS_SIZE 48
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struct fuse_statfs_out {
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struct fuse_kstatfs st;
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};
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struct fuse_fsync_in {
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__u64 fh;
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__u32 fsync_flags;
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__u32 padding;
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};
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struct fuse_setxattr_in {
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__u32 size;
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__u32 flags;
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};
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struct fuse_getxattr_in {
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__u32 size;
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__u32 padding;
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};
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struct fuse_getxattr_out {
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__u32 size;
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__u32 padding;
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};
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struct fuse_lk_in {
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__u64 fh;
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__u64 owner;
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struct fuse_file_lock lk;
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__u32 lk_flags;
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__u32 padding;
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};
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struct fuse_lk_out {
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struct fuse_file_lock lk;
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};
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struct fuse_access_in {
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__u32 mask;
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__u32 padding;
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};
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struct fuse_init_in {
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__u32 major;
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__u32 minor;
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__u32 max_readahead;
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__u32 flags;
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};
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struct fuse_init_out {
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__u32 major;
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__u32 minor;
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__u32 max_readahead;
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__u32 flags;
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__u16 max_background;
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__u16 congestion_threshold;
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__u32 max_write;
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};
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#define CUSE_INIT_INFO_MAX 4096
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struct cuse_init_in {
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__u32 major;
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__u32 minor;
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__u32 unused;
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__u32 flags;
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};
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struct cuse_init_out {
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__u32 major;
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__u32 minor;
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__u32 unused;
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__u32 flags;
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__u32 max_read;
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__u32 max_write;
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__u32 dev_major; /* chardev major */
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__u32 dev_minor; /* chardev minor */
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__u32 spare[10];
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};
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struct fuse_interrupt_in {
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__u64 unique;
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};
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struct fuse_bmap_in {
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__u64 block;
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__u32 blocksize;
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__u32 padding;
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};
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struct fuse_bmap_out {
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__u64 block;
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};
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struct fuse_ioctl_in {
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__u64 fh;
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__u32 flags;
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__u32 cmd;
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__u64 arg;
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__u32 in_size;
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__u32 out_size;
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};
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struct fuse_ioctl_out {
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__s32 result;
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__u32 flags;
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__u32 in_iovs;
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__u32 out_iovs;
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};
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struct fuse_poll_in {
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__u64 fh;
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__u64 kh;
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__u32 flags;
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__u32 padding;
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};
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struct fuse_poll_out {
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__u32 revents;
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__u32 padding;
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};
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struct fuse_notify_poll_wakeup_out {
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__u64 kh;
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};
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struct fuse_in_header {
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__u32 len;
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__u32 opcode;
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__u64 unique;
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__u64 nodeid;
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__u32 uid;
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__u32 gid;
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__u32 pid;
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__u32 padding;
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};
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struct fuse_out_header {
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__u32 len;
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__s32 error;
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__u64 unique;
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};
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struct fuse_dirent {
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__u64 ino;
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__u64 off;
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__u32 namelen;
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__u32 type;
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char name[0];
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};
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#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
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#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
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#define FUSE_DIRENT_SIZE(d) \
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FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
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struct fuse_notify_inval_inode_out {
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__u64 ino;
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__s64 off;
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__s64 len;
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};
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struct fuse_notify_inval_entry_out {
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__u64 parent;
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__u32 namelen;
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__u32 padding;
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};
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#endif /* _LINUX_FUSE_H */
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