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ext2fs_xattr.h
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ext2fs_xattr.h
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/* $NetBSD: ext2fs_xattr.h,v 1.2 2016/08/12 20:30:15 macallan Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jaromir Dolecek.
*
* 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 THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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.
*/
#ifndef _UFS_EXT2FS_EXT2FS_XATTR_H_
#define _UFS_EXT2FS_EXT2FS_XATTR_H_
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ext2fs_xattr.h,v 1.2 2016/08/12 20:30:15 macallan Exp $");
#ifdef _KERNEL
#define EXT2FS_XATTR_MAGIC 0xEA020000
#define EXT2FS_XATTR_NAME_LEN_MAX 255
#define EXT2FS_XATTR_REFCOUNT_MAX 1024
/*
* This is used as header for extended attribute block within inode
*/
struct ext2fs_xattr_ibody_header {
uint32_t h_magic; /* Magic number - 0xEA020000 */
};
/*
* This is used as header for extended attribute on separate disk block
*/
struct ext2fs_xattr_header {
uint32_t h_magic; /* Magic number - 0xEA020000 */
uint32_t h_refcount; /* Reference count */
uint32_t h_blocks; /* Number of blocks - only 1 supported */
uint32_t h_hash; /* Hash of all attributes */
uint32_t h_checksum; /* Checksum of the extended attribute block */
uint32_t h_reserved[3];
};
/*
* Extended attribute on-disk header structure
*/
struct ext2fs_xattr_entry {
uint8_t e_name_len; /* Name length */
uint8_t e_name_index; /* Name prefix index (see below) */
uint16_t e_value_offs; /* Offset of value within block */
uint32_t e_value_block; /* Value block - not supported (always zero) */
uint32_t e_value_size; /* Length of value */
uint32_t e_hash; /* Hash (not supported) */
char e_name[0]; /* Name string (e_name_len bytes) */
};
/*
* Linux kernel checks only the 0, we also check that the current entry
* doesn't overflow past end.
*/
#define EXT2FS_XATTR_IS_LAST_ENTRY(entry, end) \
(*((uint32_t *)(entry)) == 0 || (uintptr_t)EXT2FS_XATTR_NEXT(entry) > (uintptr_t)end)
/*
* Each ext2fs_xattr_entry starts on next 4-byte boundary, pad if necessary.
*/
#define EXT2FS_XATTR_PAD 4
#define EXT2FS_XATTR_ROUND (EXT2FS_XATTR_PAD - 1)
#define EXT2FS_XATTR_LEN(name_len) \
(((name_len) + EXT2FS_XATTR_ROUND + \
sizeof(struct ext2fs_xattr_entry)) & ~EXT2FS_XATTR_ROUND)
#define EXT2FS_XATTR_NEXT(entry) \
(struct ext2fs_xattr_entry *)(((uint8_t *)(entry)) + EXT2FS_XATTR_LEN((entry)->e_name_len))
#define EXT2FS_XATTR_IFIRST(h) (void *)&(h)[1]
#define EXT2FS_XATTR_BFIRST(h) EXT2FS_XATTR_IFIRST(h)
/*
* Name prefixes
*/
#define EXT2FS_XATTR_PREFIX_NONE 0 /* no prefix */
#define EXT2FS_XATTR_PREFIX_USER 1 /* "user." */
#define EXT2FS_XATTR_PREFIX_POSIX_ACCESS 2 /* "system.posix_acl_access" */
#define EXT2FS_XATTR_PREFIX_POSIX_DEFAULT1 3 /* "system.posix_acl_default" */
#define EXT2FS_XATTR_PREFIX_TRUSTED 4 /* "trusted." */
#define EXT2FS_XATTR_PREFIX_SECURITY 6 /* "security." */
#define EXT2FS_XATTR_PREFIX_SYSTEM 7 /* "system." */
#define EXT2FS_XATTR_PREFIX_SYSTEM_RICHACL 8 /* "system.richacl" */
#define EXT2FS_XATTR_PREFIX_ENCRYPTION 9 /* "c" */
int ext2fs_getextattr(void *);
int ext2fs_setextattr(void *);
int ext2fs_listextattr(void *);
int ext2fs_deleteextattr(void *);
#endif /* _KERNEL */
#endif /* _UFS_EXT2FS_EXT2FS_XATTR_H_ */