Commit | Line | Data |
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1da177e4 LT |
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 | ||
10f47e6a SS |
119 | #ifdef CONFIG_EXT2_FS_SECURITY |
120 | extern int ext2_init_security(struct inode *inode, struct inode *dir); | |
121 | #else | |
122 | static inline int ext2_init_security(struct inode *inode, struct inode *dir) | |
123 | { | |
124 | return 0; | |
125 | } | |
126 | #endif |