2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2017, Fedor Uporov
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8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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14 * documentation and/or other materials provided with the distribution.
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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31 #ifndef _FS_EXT2FS_EXT2_EXTARTTR_H_
32 #define _FS_EXT2FS_EXT2_EXTARTTR_H_
34 /* Linux xattr name indexes */
35 #define EXT4_XATTR_INDEX_USER 1
36 #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
37 #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
38 #define EXT4_XATTR_INDEX_TRUSTED 4
39 #define EXT4_XATTR_INDEX_LUSTRE 5
40 #define EXT4_XATTR_INDEX_SECURITY 6
41 #define EXT4_XATTR_INDEX_SYSTEM 7
42 #define EXT4_XATTR_INDEX_RICHACL 8
43 #define EXT4_XATTR_INDEX_ENCRYPTION 9
45 /* Magic value in attribute blocks */
46 #define EXTATTR_MAGIC 0xEA020000
48 /* Max EA name length */
49 #define EXT2_EXTATTR_NAMELEN_MAX 255
51 /* EA hash constants */
52 #define EXT2_EXTATTR_NAME_HASH_SHIFT 5
53 #define EXT2_EXTATTR_VALUE_HASH_SHIFT 16
54 #define EXT2_EXTATTR_BLOCK_HASH_SHIFT 16
57 struct ext2fs_extattr_header {
58 int32_t h_magic; /* magic number for identification */
59 int32_t h_refcount; /* reference count */
60 int32_t h_blocks; /* number of disk blocks used */
61 int32_t h_hash; /* hash value of all attributes */
62 uint32_t h_reserved[4]; /* zero right now */
65 struct ext2fs_extattr_dinode_header {
66 int32_t h_magic; /* magic number for identification */
69 struct ext2fs_extattr_entry {
70 uint8_t e_name_len; /* length of name */
71 uint8_t e_name_index; /* attribute name index */
72 uint16_t e_value_offs; /* offset in disk block of value */
73 uint32_t e_value_block; /* disk block attribute is stored on (n/i) */
74 uint32_t e_value_size; /* size of attribute value */
75 uint32_t e_hash; /* hash value of name and value */
76 char e_name[0]; /* attribute name */
79 #define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
81 #define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
82 #define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
83 #define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
84 #define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
86 #define EXT2_EXTATTR_PAD_BITS 2
87 #define EXT2_EXTATTR_PAD (1<<EXT2_EXTATTR_PAD_BITS)
88 #define EXT2_EXTATTR_ROUND (EXT2_EXTATTR_PAD-1)
89 #define EXT2_EXTATTR_LEN(name_len) \
90 (((name_len) + EXT2_EXTATTR_ROUND + \
91 sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
93 #define EXT2_EXTATTR_SIZE(size) \
94 (((size) + EXT2_EXTATTR_ROUND) & ~EXT2_EXTATTR_ROUND)
96 #define EXT2_EXTATTR_NEXT(entry) \
97 ( (struct ext2fs_extattr_entry *)( \
98 (char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
100 int ext2_extattr_inode_delete(struct inode *ip, int attrnamespace,
103 int ext2_extattr_block_delete(struct inode *ip, int attrnamespace,
106 int ext2_extattr_free(struct inode *ip);
107 int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
108 struct uio *uio, size_t *size);
110 int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
111 struct uio *uio, size_t *size);
113 int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
114 const char *name, struct uio *uio, size_t *size);
116 int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
117 const char *name, struct uio *uio, size_t *size);
119 int ext2_extattr_inode_set(struct inode *ip, int attrnamespace,
120 const char *name, struct uio *uio);
122 int ext2_extattr_block_set(struct inode *ip, int attrnamespace,
123 const char *name, struct uio *uio);
125 int ext2_extattr_valid_attrname(int attrnamespace, const char *attrname);
127 #endif /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */