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