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9#include <linux/init.h>
10#include <linux/xattr.h>
11
12
13#define EXT2_XATTR_MAGIC 0xEA020000
14
15
16#define EXT2_XATTR_REFCOUNT_MAX 1024
17
18
19#define EXT2_XATTR_INDEX_USER 1
20#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
21#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
22#define EXT2_XATTR_INDEX_TRUSTED 4
23#define EXT2_XATTR_INDEX_LUSTRE 5
24#define EXT2_XATTR_INDEX_SECURITY 6
25
26struct ext2_xattr_header {
27 __le32 h_magic;
28 __le32 h_refcount;
29 __le32 h_blocks;
30 __le32 h_hash;
31 __u32 h_reserved[4];
32};
33
34struct ext2_xattr_entry {
35 __u8 e_name_len;
36 __u8 e_name_index;
37 __le16 e_value_offs;
38 __le32 e_value_block;
39 __le32 e_value_size;
40 __le32 e_hash;
41 char e_name[0];
42};
43
44#define EXT2_XATTR_PAD_BITS 2
45#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
46#define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
47#define EXT2_XATTR_LEN(name_len) \
48 (((name_len) + EXT2_XATTR_ROUND + \
49 sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
50#define EXT2_XATTR_NEXT(entry) \
51 ( (struct ext2_xattr_entry *)( \
52 (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
53#define EXT2_XATTR_SIZE(size) \
54 (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
55
56# ifdef CONFIG_EXT2_FS_XATTR
57
58extern const struct xattr_handler ext2_xattr_user_handler;
59extern const struct xattr_handler ext2_xattr_trusted_handler;
60extern const struct xattr_handler ext2_xattr_security_handler;
61
62extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
63
64extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
65extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
66
67extern void ext2_xattr_delete_inode(struct inode *);
68extern void ext2_xattr_put_super(struct super_block *);
69
70extern int init_ext2_xattr(void);
71extern void exit_ext2_xattr(void);
72
73extern const struct xattr_handler *ext2_xattr_handlers[];
74
75# else
76
77static inline int
78ext2_xattr_get(struct inode *inode, int name_index,
79 const char *name, void *buffer, size_t size)
80{
81 return -EOPNOTSUPP;
82}
83
84static inline int
85ext2_xattr_set(struct inode *inode, int name_index, const char *name,
86 const void *value, size_t size, int flags)
87{
88 return -EOPNOTSUPP;
89}
90
91static inline void
92ext2_xattr_delete_inode(struct inode *inode)
93{
94}
95
96static inline void
97ext2_xattr_put_super(struct super_block *sb)
98{
99}
100
101static inline int
102init_ext2_xattr(void)
103{
104 return 0;
105}
106
107static inline void
108exit_ext2_xattr(void)
109{
110}
111
112#define ext2_xattr_handlers NULL
113
114# endif
115
116#ifdef CONFIG_EXT2_FS_SECURITY
117extern int ext2_init_security(struct inode *inode, struct inode *dir,
118 const struct qstr *qstr);
119#else
120static inline int ext2_init_security(struct inode *inode, struct inode *dir,
121 const struct qstr *qstr)
122{
123 return 0;
124}
125#endif
126