kernel/fuse_kernel.h

/*
    FUSE: Filesystem in Userspace
    Copyright (C) 2001-2005  Miklos Szeredi <miklos@szeredi.hu>

    This program can be distributed under the terms of the GNU GPL.
    See the file COPYING.
*/

/*
    This -- and only this -- header file may also be distributed under
    the terms of the BSD Licence as follows:

    Copyright (C) 2005 Miklos Szeredi. All rights reserved.
    
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    
    THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
*/

/* This file defines the kernel interface of FUSE */

#include <asm/types.h>

/** Version number of this interface */
#define FUSE_KERNEL_VERSION 7

/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 2

/** The node ID of the root inode */
#define FUSE_ROOT_ID 1

/** The major number of the fuse character device */
#define FUSE_MAJOR 10

/** The minor number of the fuse character device */
#define FUSE_MINOR 229

/* Make sure all structures are padded to 64bit boundary, so 32bit
   userspace works under 64bit kernels */

struct fuse_attr {
	__u64	ino;
	__u64	size;
	__u64	blocks;
	__u64	atime;
	__u64	mtime;
	__u64	ctime;
	__u32	atimensec;
	__u32	mtimensec;
	__u32	ctimensec;
	__u32	mode;
	__u32	nlink;
	__u32	uid;
	__u32	gid;
	__u32	rdev;
};

struct fuse_kstatfs {
	__u64	blocks;
	__u64	bfree;
	__u64	bavail;
	__u64	files;
	__u64	ffree;
	__u32	bsize;
	__u32	namelen;
};

#define FATTR_MODE	(1 << 0)
#define FATTR_UID	(1 << 1)
#define FATTR_GID	(1 << 2)
#define FATTR_SIZE	(1 << 3)
#define FATTR_ATIME	(1 << 4)
#define FATTR_MTIME	(1 << 5)
#define FATTR_CTIME	(1 << 6)

/**
 * Flags returned by the OPEN request
 *
 * FOPEN_DIRECT_IO: bypass page cache for this open file
 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 */
#define FOPEN_DIRECT_IO		(1 << 0)
#define FOPEN_KEEP_CACHE	(1 << 1)

enum fuse_opcode {
	FUSE_LOOKUP	   = 1,
	FUSE_FORGET	   = 2,  /* no reply */
	FUSE_GETATTR	   = 3,
	FUSE_SETATTR	   = 4,
	FUSE_READLINK	   = 5,
	FUSE_SYMLINK	   = 6,
	FUSE_MKNOD	   = 8,
	FUSE_MKDIR	   = 9,
	FUSE_UNLINK	   = 10,
	FUSE_RMDIR	   = 11,
	FUSE_RENAME	   = 12,
	FUSE_LINK	   = 13,
	FUSE_OPEN	   = 14,
	FUSE_READ	   = 15,
	FUSE_WRITE	   = 16,
	FUSE_STATFS	   = 17,
	FUSE_RELEASE       = 18,
	FUSE_FSYNC         = 20,
	FUSE_SETXATTR      = 21,
	FUSE_GETXATTR      = 22,
	FUSE_LISTXATTR     = 23,
	FUSE_REMOVEXATTR   = 24,
	FUSE_FLUSH         = 25,
	FUSE_INIT          = 26,
	FUSE_OPENDIR       = 27,
	FUSE_READDIR       = 28,
	FUSE_RELEASEDIR    = 29,
	FUSE_FSYNCDIR      = 30
};

/* Conservative buffer size for the client */
#define FUSE_MAX_IN 8192

#define FUSE_NAME_MAX 1024
#define FUSE_SYMLINK_MAX 4096
#define FUSE_XATTR_SIZE_MAX 4096

struct fuse_entry_out {
	__u64	nodeid;		/* Inode ID */
	__u64	generation;	/* Inode generation: nodeid:gen must
				   be unique for the fs's lifetime */
	__u64	entry_valid;	/* Cache timeout for the name */
	__u64	attr_valid;	/* Cache timeout for the attributes */
	__u32	entry_valid_nsec;
	__u32	attr_valid_nsec;
	struct fuse_attr attr;
};

struct fuse_forget_in {
	__u64	nlookup;
};

struct fuse_attr_out {
	__u64	attr_valid;	/* Cache timeout for the attributes */
	__u32	attr_valid_nsec;
	__u32	dummy;
	struct fuse_attr attr;
};

struct fuse_mknod_in {
	__u32	mode;
	__u32	rdev;
};

struct fuse_mkdir_in {
	__u32	mode;
	__u32	padding;
};

struct fuse_rename_in {
	__u64	newdir;
};

struct fuse_link_in {
	__u64	oldnodeid;
};

struct fuse_setattr_in {
	__u32	valid;
	__u32	padding;
	struct fuse_attr attr;
};

struct fuse_open_in {
	__u32	flags;
	__u32	padding;
};

struct fuse_open_out {
	__u64	fh;
	__u32	open_flags;
	__u32	padding;
};

struct fuse_release_in {
	__u64	fh;
	__u32	flags;
	__u32	padding;
};

struct fuse_flush_in {
	__u64	fh;
	__u32	flush_flags;
	__u32	padding;
};

struct fuse_read_in {
	__u64	fh;
	__u64	offset;
	__u32	size;
	__u32	padding;
};

struct fuse_write_in {
	__u64	fh;
	__u64	offset;
	__u32	size;
	__u32	write_flags;
};

struct fuse_write_out {
	__u32	size;
	__u32	padding;
};

struct fuse_statfs_out {
	struct fuse_kstatfs st;
};

struct fuse_fsync_in {
	__u64	fh;
	__u32	fsync_flags;
	__u32	padding;
};

struct fuse_setxattr_in {
	__u32	size;
	__u32	flags;
};

struct fuse_getxattr_in {
	__u32	size;
	__u32	padding;
};

struct fuse_getxattr_out {
	__u32	size;
	__u32	padding;
};

struct fuse_init_in_out {
	__u32	major;
	__u32	minor;
};

struct fuse_in_header {
	__u32	len;
	__u32	opcode;
	__u64	unique;
	__u64	nodeid;
	__u32	uid;
	__u32	gid;
	__u32	pid;
	__u32	padding;
};

struct fuse_out_header {
	__u32	len;
	__s32	error;
	__u64	unique;
};

struct fuse_dirent {
	__u64	ino;
	__u64	off;
	__u32	namelen;
	__u32	type;
	char name[0];
};

#define FUSE_NAME_OFFSET ((unsigned) ((struct fuse_dirent *) 0)->name)
#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
#define FUSE_DIRENT_SIZE(d) \
	FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)