127 lines
4.7 KiB
C
127 lines
4.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2017, Fedor Uporov
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* All rights reserved.
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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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _FS_EXT2FS_EXT2_EXTARTTR_H_
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#define _FS_EXT2FS_EXT2_EXTARTTR_H_
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/* Linux xattr name indexes */
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#define EXT4_XATTR_INDEX_USER 1
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#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define EXT4_XATTR_INDEX_TRUSTED 4
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#define EXT4_XATTR_INDEX_LUSTRE 5
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#define EXT4_XATTR_INDEX_SECURITY 6
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#define EXT4_XATTR_INDEX_SYSTEM 7
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#define EXT4_XATTR_INDEX_RICHACL 8
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#define EXT4_XATTR_INDEX_ENCRYPTION 9
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/* Magic value in attribute blocks */
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#define EXTATTR_MAGIC 0xEA020000
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/* Max EA name length */
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#define EXT2_EXTATTR_NAMELEN_MAX 255
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/* EA hash constants */
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#define EXT2_EXTATTR_NAME_HASH_SHIFT 5
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#define EXT2_EXTATTR_VALUE_HASH_SHIFT 16
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#define EXT2_EXTATTR_BLOCK_HASH_SHIFT 16
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struct ext2fs_extattr_header {
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int32_t h_magic; /* magic number for identification */
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int32_t h_refcount; /* reference count */
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int32_t h_blocks; /* number of disk blocks used */
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int32_t h_hash; /* hash value of all attributes */
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int32_t h_checksum; /* crc32c(uuid+id+xattrblock) */
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/* id = inum if refcount=1, blknum otherwise */
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uint32_t h_reserved[3]; /* zero right now */
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};
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struct ext2fs_extattr_dinode_header {
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int32_t h_magic; /* magic number for identification */
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};
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struct ext2fs_extattr_entry {
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uint8_t e_name_len; /* length of name */
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uint8_t e_name_index; /* attribute name index */
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uint16_t e_value_offs; /* offset in disk block of value */
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uint32_t e_value_block; /* disk block attribute is stored on (n/i) */
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uint32_t e_value_size; /* size of attribute value */
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uint32_t e_hash; /* hash value of name and value */
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char e_name[0]; /* attribute name */
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};
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#define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
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#define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
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#define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
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#define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
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#define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
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#define EXT2_EXTATTR_PAD_BITS 2
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#define EXT2_EXTATTR_PAD (1<<EXT2_EXTATTR_PAD_BITS)
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#define EXT2_EXTATTR_ROUND (EXT2_EXTATTR_PAD-1)
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#define EXT2_EXTATTR_LEN(name_len) \
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(((name_len) + EXT2_EXTATTR_ROUND + \
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sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
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#define EXT2_EXTATTR_SIZE(size) \
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(((size) + EXT2_EXTATTR_ROUND) & ~EXT2_EXTATTR_ROUND)
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#define EXT2_EXTATTR_NEXT(entry) \
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( (struct ext2fs_extattr_entry *)( \
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(char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
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int ext2_extattr_inode_delete(struct inode *ip, int attrnamespace,
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const char *name);
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int ext2_extattr_block_delete(struct inode *ip, int attrnamespace,
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const char *name);
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int ext2_extattr_free(struct inode *ip);
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int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
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struct uio *uio, size_t *size);
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int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
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struct uio *uio, size_t *size);
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int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
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const char *name, struct uio *uio, size_t *size);
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int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
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const char *name, struct uio *uio, size_t *size);
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int ext2_extattr_inode_set(struct inode *ip, int attrnamespace,
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const char *name, struct uio *uio);
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int ext2_extattr_block_set(struct inode *ip, int attrnamespace,
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const char *name, struct uio *uio);
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int ext2_extattr_valid_attrname(int attrnamespace, const char *attrname);
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#endif /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */
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