1 /*
2 File: fs/ext3/xattr.h
3
4 On-disk format of extended attributes for the ext3 filesystem.
5
6 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
7 */
8
9 #include <linux/config.h>
10 #include <linux/xattr.h>
11
12 /* Magic value in attribute blocks */
13 #define EXT3_XATTR_MAGIC 0xEA020000
14
15 /* Maximum number of references to one attribute block */
16 #define EXT3_XATTR_REFCOUNT_MAX 1024
17
18 /* Name indexes */
19 #define EXT3_XATTR_INDEX_USER 1
20 #define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS 2
21 #define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT 3
22 #define EXT3_XATTR_INDEX_TRUSTED 4
23 #define EXT3_XATTR_INDEX_LUSTRE 5
24 #define EXT3_XATTR_INDEX_SECURITY 6
25
26 struct ext3_xattr_header {
27 __le32 h_magic; /* magic number for identification */
28 __le32 h_refcount; /* reference count */
29 __le32 h_blocks; /* number of disk blocks used */
30 __le32 h_hash; /* hash value of all attributes */
31 __u32 h_reserved[4]; /* zero right now */
32 };
33
34 struct ext3_xattr_ibody_header {
35 __le32 h_magic; /* magic number for identification */
36 };
37
38 struct ext3_xattr_entry {
39 __u8 e_name_len; /* length of name */
40 __u8 e_name_index; /* attribute name index */
41 __le16 e_value_offs; /* offset in disk block of value */
42 __le32 e_value_block; /* disk block attribute is stored on (n/i) */
43 __le32 e_value_size; /* size of attribute value */
44 __le32 e_hash; /* hash value of name and value */
45 char e_name[0]; /* attribute name */
46 };
47
48 #define EXT3_XATTR_PAD_BITS 2
49 #define EXT3_XATTR_PAD (1<<EXT3_XATTR_PAD_BITS)
50 #define EXT3_XATTR_ROUND (EXT3_XATTR_PAD-1)
51 #define EXT3_XATTR_LEN(name_len) \
52 (((name_len) + EXT3_XATTR_ROUND + \
53 sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND)
54 #define EXT3_XATTR_NEXT(entry) \
55 ( (struct ext3_xattr_entry *)( \
56 (char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) )
57 #define EXT3_XATTR_SIZE(size) \
58 (((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND)
59
60 # ifdef CONFIG_EXT3_FS_XATTR
61
62 extern struct xattr_handler ext3_xattr_user_handler;
63 extern struct xattr_handler ext3_xattr_trusted_handler;
64 extern struct xattr_handler ext3_xattr_acl_access_handler;
65 extern struct xattr_handler ext3_xattr_acl_default_handler;
66 extern struct xattr_handler ext3_xattr_security_handler;
67
68 extern ssize_t ext3_listxattr(struct dentry *, char *, size_t);
69
70 extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t);
71 extern int ext3_xattr_list(struct inode *, char *, size_t);
72 extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
73 extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
74
75 extern void ext3_xattr_delete_inode(handle_t *, struct inode *);
76 extern void ext3_xattr_put_super(struct super_block *);
77
78 extern int init_ext3_xattr(void);
79 extern void exit_ext3_xattr(void);
80
81 extern struct xattr_handler *ext3_xattr_handlers[];
82
83 # else /* CONFIG_EXT3_FS_XATTR */
84
85 static inline int
86 ext3_xattr_get(struct inode *inode, int name_index, const char *name,
87 void *buffer, size_t size, int flags)
88 {
89 return -EOPNOTSUPP;
90 }
91
92 static inline int
93 ext3_xattr_list(struct inode *inode, void *buffer, size_t size)
94 {
95 return -EOPNOTSUPP;
96 }
97
98 static inline int
99 ext3_xattr_set(struct inode *inode, int name_index, const char *name,
100 const void *value, size_t size, int flags)
101 {
102 return -EOPNOTSUPP;
103 }
104
105 static inline int
106 ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
107 const char *name, const void *value, size_t size, int flags)
108 {
109 return -EOPNOTSUPP;
110 }
111
112 static inline void
113 ext3_xattr_delete_inode(handle_t *handle, struct inode *inode)
114 {
115 }
116
117 static inline void
118 ext3_xattr_put_super(struct super_block *sb)
119 {
120 }
121
122 static inline int
123 init_ext3_xattr(void)
124 {
125 return 0;
126 }
127
128 static inline void
129 exit_ext3_xattr(void)
130 {
131 }
132
133 #define ext3_xattr_handlers NULL
134
135 # endif /* CONFIG_EXT3_FS_XATTR */
136
137 #ifdef CONFIG_EXT3_FS_SECURITY
138 extern int ext3_init_security(handle_t *handle, struct inode *inode,
139 struct inode *dir);
140 #else
141 static inline int ext3_init_security(handle_t *handle, struct inode *inode,
142 struct inode *dir)
143 {
144 return 0;
145 }
146 #endif
147
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