2 * Copyright (c) 2017, Fedor Uporov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 #ifndef _FS_EXT2FS_EXT2_EXTARTTR_H_
30 #define _FS_EXT2FS_EXT2_EXTARTTR_H_
32 /* Linux xattr name indexes */
33 #define EXT4_XATTR_INDEX_USER 1
34 #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
35 #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
36 #define EXT4_XATTR_INDEX_TRUSTED 4
37 #define EXT4_XATTR_INDEX_LUSTRE 5
38 #define EXT4_XATTR_INDEX_SECURITY 6
39 #define EXT4_XATTR_INDEX_SYSTEM 7
40 #define EXT4_XATTR_INDEX_RICHACL 8
41 #define EXT4_XATTR_INDEX_ENCRYPTION 9
43 /* Magic value in attribute blocks */
44 #define EXTATTR_MAGIC 0xEA020000
46 struct ext2fs_extattr_header {
47 int32_t h_magic; /* magic number for identification */
48 int32_t h_refcount; /* reference count */
49 int32_t h_blocks; /* number of disk blocks used */
50 int32_t h_hash; /* hash value of all attributes */
51 uint32_t h_reserved[4]; /* zero right now */
54 struct ext2fs_extattr_dinode_header {
55 int32_t h_magic; /* magic number for identification */
58 struct ext2fs_extattr_entry {
59 uint8_t e_name_len; /* length of name */
60 uint8_t e_name_index; /* attribute name index */
61 uint16_t e_value_offs; /* offset in disk block of value */
62 uint32_t e_value_block; /* disk block attribute is stored on (n/i) */
63 uint32_t e_value_size; /* size of attribute value */
64 uint32_t e_hash; /* hash value of name and value */
65 char e_name[0]; /* attribute name */
68 #define EXT2_IHDR(inode, raw_inode) \
69 ((struct ext4_xattr_ibody_header *) \
70 ((void *)raw_inode + \
71 EXT4_GOOD_OLD_INODE_SIZE + \
72 EXT4_I(inode)->i_extra_isize))
74 #define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
76 #define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
77 #define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
78 #define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
79 #define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
81 #define EXT2_EXTATTR_PAD_BITS 2
82 #define EXT2_EXTATTR_PAD (1<<EXT2_EXTATTR_PAD_BITS)
83 #define EXT2_EXTATTR_ROUND (EXT2_EXTATTR_PAD-1)
84 #define EXT2_EXTATTR_LEN(name_len) \
85 (((name_len) + EXT2_EXTATTR_ROUND + \
86 sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
88 #define EXT2_EXTATTR_NEXT(entry) \
89 ( (struct ext2fs_extattr_entry *)( \
90 (char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
92 int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
93 struct uio *uio, size_t *size);
95 int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
96 struct uio *uio, size_t *size);
98 int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
99 const char *name, struct uio *uio, size_t *size);
101 int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
102 const char *name, struct uio *uio, size_t *size);
104 #endif /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */