118 lines
4.4 KiB
C
118 lines
4.4 KiB
C
/* $NetBSD: ext2fs_xattr.h,v 1.2 2016/08/12 20:30:15 macallan Exp $ */
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/*-
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* Copyright (c) 2016 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jaromir Dolecek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _UFS_EXT2FS_EXT2FS_XATTR_H_
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#define _UFS_EXT2FS_EXT2FS_XATTR_H_
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_xattr.h,v 1.2 2016/08/12 20:30:15 macallan Exp $");
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#ifdef _KERNEL
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#define EXT2FS_XATTR_MAGIC 0xEA020000
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#define EXT2FS_XATTR_NAME_LEN_MAX 255
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#define EXT2FS_XATTR_REFCOUNT_MAX 1024
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/*
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* This is used as header for extended attribute block within inode
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*/
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struct ext2fs_xattr_ibody_header {
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uint32_t h_magic; /* Magic number - 0xEA020000 */
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};
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/*
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* This is used as header for extended attribute on separate disk block
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*/
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struct ext2fs_xattr_header {
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uint32_t h_magic; /* Magic number - 0xEA020000 */
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uint32_t h_refcount; /* Reference count */
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uint32_t h_blocks; /* Number of blocks - only 1 supported */
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uint32_t h_hash; /* Hash of all attributes */
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uint32_t h_checksum; /* Checksum of the extended attribute block */
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uint32_t h_reserved[3];
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};
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/*
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* Extended attribute on-disk header structure
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*/
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struct ext2fs_xattr_entry {
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uint8_t e_name_len; /* Name length */
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uint8_t e_name_index; /* Name prefix index (see below) */
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uint16_t e_value_offs; /* Offset of value within block */
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uint32_t e_value_block; /* Value block - not supported (always zero) */
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uint32_t e_value_size; /* Length of value */
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uint32_t e_hash; /* Hash (not supported) */
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char e_name[0]; /* Name string (e_name_len bytes) */
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};
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/*
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* Linux kernel checks only the 0, we also check that the current entry
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* doesn't overflow past end.
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*/
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#define EXT2FS_XATTR_IS_LAST_ENTRY(entry, end) \
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(*((uint32_t *)(entry)) == 0 || (uintptr_t)EXT2FS_XATTR_NEXT(entry) > (uintptr_t)end)
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/*
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* Each ext2fs_xattr_entry starts on next 4-byte boundary, pad if necessary.
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*/
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#define EXT2FS_XATTR_PAD 4
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#define EXT2FS_XATTR_ROUND (EXT2FS_XATTR_PAD - 1)
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#define EXT2FS_XATTR_LEN(name_len) \
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(((name_len) + EXT2FS_XATTR_ROUND + \
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sizeof(struct ext2fs_xattr_entry)) & ~EXT2FS_XATTR_ROUND)
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#define EXT2FS_XATTR_NEXT(entry) \
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(struct ext2fs_xattr_entry *)(((uint8_t *)(entry)) + EXT2FS_XATTR_LEN((entry)->e_name_len))
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#define EXT2FS_XATTR_IFIRST(h) (void *)&(h)[1]
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#define EXT2FS_XATTR_BFIRST(h) EXT2FS_XATTR_IFIRST(h)
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/*
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* Name prefixes
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*/
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#define EXT2FS_XATTR_PREFIX_NONE 0 /* no prefix */
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#define EXT2FS_XATTR_PREFIX_USER 1 /* "user." */
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#define EXT2FS_XATTR_PREFIX_POSIX_ACCESS 2 /* "system.posix_acl_access" */
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#define EXT2FS_XATTR_PREFIX_POSIX_DEFAULT1 3 /* "system.posix_acl_default" */
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#define EXT2FS_XATTR_PREFIX_TRUSTED 4 /* "trusted." */
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#define EXT2FS_XATTR_PREFIX_SECURITY 6 /* "security." */
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#define EXT2FS_XATTR_PREFIX_SYSTEM 7 /* "system." */
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#define EXT2FS_XATTR_PREFIX_SYSTEM_RICHACL 8 /* "system.richacl" */
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#define EXT2FS_XATTR_PREFIX_ENCRYPTION 9 /* "c" */
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int ext2fs_getextattr(void *);
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int ext2fs_setextattr(void *);
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int ext2fs_listextattr(void *);
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int ext2fs_deleteextattr(void *);
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#endif /* _KERNEL */
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#endif /* _UFS_EXT2FS_EXT2FS_XATTR_H_ */
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