1 /*
2 File: linux/ext2_xattr.h
3
4 On-disk format of extended attributes for the ext2 filesystem.
5
6 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
7 */
8
9 #include <linux/config.h>
10 #include <linux/init.h>
11 #include <linux/xattr.h>
12
13 /* Magic value in attribute blocks */
14 #define EXT2_XATTR_MAGIC 0xEA020000
15
16 /* Maximum number of references to one attribute block */
17 #define EXT2_XATTR_REFCOUNT_MAX 1024
18
19 /* Name indexes */
20 #define EXT2_XATTR_INDEX_USER 1
21 #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
22 #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
23 #define EXT2_XATTR_INDEX_TRUSTED 4
24 #define EXT2_XATTR_INDEX_LUSTRE 5
25 #define EXT2_XATTR_INDEX_SECURITY 6
26
27 struct ext2_xattr_header {
28 __le32 h_magic; /* magic number for identification */
29 __le32 h_refcount; /* reference count */
30 __le32 h_blocks; /* number of disk blocks used */
31 __le32 h_hash; /* hash value of all attributes */
32 __u32 h_reserved[4]; /* zero right now */
33 };
34
35 struct ext2_xattr_entry {
36 __u8 e_name_len; /* length of name */
37 __u8 e_name_index; /* attribute name index */
38 __le16 e_value_offs; /* offset in disk block of value */
39 __le32 e_value_block; /* disk block attribute is stored on (n/i) */
40 __le32 e_value_size; /* size of attribute value */
41 __le32 e_hash; /* hash value of name and value */
42 char e_name[0]; /* attribute name */
43 };
44
45 #define EXT2_XATTR_PAD_BITS 2
46 #define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
47 #define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
48 #define EXT2_XATTR_LEN(name_len) \
49 (((name_len) + EXT2_XATTR_ROUND + \
50 sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
51 #define EXT2_XATTR_NEXT(entry) \
52 ( (struct ext2_xattr_entry *)( \
53 (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
54 #define EXT2_XATTR_SIZE(size) \
55 (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
56
57 # ifdef CONFIG_EXT2_FS_XATTR
58
59 extern struct xattr_handler ext2_xattr_user_handler;
60 extern struct xattr_handler ext2_xattr_trusted_handler;
61 extern struct xattr_handler ext2_xattr_acl_access_handler;
62 extern struct xattr_handler ext2_xattr_acl_default_handler;
63 extern struct xattr_handler ext2_xattr_security_handler;
64
65 extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
66
67 extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
68 extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
69
70 extern void ext2_xattr_delete_inode(struct inode *);
71 extern void ext2_xattr_put_super(struct super_block *);
72
73 extern int init_ext2_xattr(void);
74 extern void exit_ext2_xattr(void);
75
76 extern struct xattr_handler *ext2_xattr_handlers[];
77
78 # else /* CONFIG_EXT2_FS_XATTR */
79
80 static inline int
81 ext2_xattr_get(struct inode *inode, int name_index,
82 const char *name, void *buffer, size_t size)
83 {
84 return -EOPNOTSUPP;
85 }
86
87 static inline int
88 ext2_xattr_set(struct inode *inode, int name_index, const char *name,
89 const void *value, size_t size, int flags)
90 {
91 return -EOPNOTSUPP;
92 }
93
94 static inline void
95 ext2_xattr_delete_inode(struct inode *inode)
96 {
97 }
98
99 static inline void
100 ext2_xattr_put_super(struct super_block *sb)
101 {
102 }
103
104 static inline int
105 init_ext2_xattr(void)
106 {
107 return 0;
108 }
109
110 static inline void
111 exit_ext2_xattr(void)
112 {
113 }
114
115 #define ext2_xattr_handlers NULL
116
117 # endif /* CONFIG_EXT2_FS_XATTR */
118
119
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