1 /*
2 File: linux/reiserfs_xattr.h
3 */
4
5 #include <linux/config.h>
6 #include <linux/init.h>
7 #include <linux/xattr.h>
8
9 /* Magic value in header */
10 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
11
12 struct reiserfs_xattr_header {
13 __u32 h_magic; /* magic number for identification */
14 __u32 h_hash; /* hash of the value */
15 };
16
17 #ifdef __KERNEL__
18
19 struct reiserfs_xattr_handler {
20 char *prefix;
21 int (*init)(void);
22 void (*exit)(void);
23 int (*get)(struct inode *inode, const char *name, void *buffer,
24 size_t size);
25 int (*set)(struct inode *inode, const char *name, const void *buffer,
26 size_t size, int flags);
27 int (*del)(struct inode *inode, const char *name);
28 int (*list)(struct inode *inode, const char *name, int namelen, char *out);
29 struct list_head handlers;
30 };
31
32
33 #ifdef CONFIG_REISERFS_FS_XATTR
34 #define is_reiserfs_priv_object(inode) (REISERFS_I(inode)->i_flags & i_priv_object)
35 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
36 ssize_t reiserfs_getxattr (struct dentry *dentry, const char *name,
37 void *buffer, size_t size);
38 int reiserfs_setxattr (struct dentry *dentry, const char *name,
39 const void *value, size_t size, int flags);
40 ssize_t reiserfs_listxattr (struct dentry *dentry, char *buffer, size_t size);
41 int reiserfs_removexattr (struct dentry *dentry, const char *name);
42 int reiserfs_delete_xattrs (struct inode *inode);
43 int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs);
44 int reiserfs_xattr_init (struct super_block *sb, int mount_flags);
45 int reiserfs_permission (struct inode *inode, int mask, struct nameidata *nd);
46 int reiserfs_permission_locked (struct inode *inode, int mask, struct nameidata *nd);
47
48 int reiserfs_xattr_del (struct inode *, const char *);
49 int reiserfs_xattr_get (const struct inode *, const char *, void *, size_t);
50 int reiserfs_xattr_set (struct inode *, const char *, const void *,
51 size_t, int);
52
53 extern struct reiserfs_xattr_handler user_handler;
54 extern struct reiserfs_xattr_handler trusted_handler;
55 #ifdef CONFIG_REISERFS_FS_SECURITY
56 extern struct reiserfs_xattr_handler security_handler;
57 #endif
58
59 int reiserfs_xattr_register_handlers (void) __init;
60 void reiserfs_xattr_unregister_handlers (void);
61
62 static inline void
63 reiserfs_write_lock_xattrs(struct super_block *sb)
64 {
65 down_write (&REISERFS_XATTR_DIR_SEM(sb));
66 }
67 static inline void
68 reiserfs_write_unlock_xattrs(struct super_block *sb)
69 {
70 up_write (&REISERFS_XATTR_DIR_SEM(sb));
71 }
72 static inline void
73 reiserfs_read_lock_xattrs(struct super_block *sb)
74 {
75 down_read (&REISERFS_XATTR_DIR_SEM(sb));
76 }
77
78 static inline void
79 reiserfs_read_unlock_xattrs(struct super_block *sb)
80 {
81 up_read (&REISERFS_XATTR_DIR_SEM(sb));
82 }
83
84 static inline void
85 reiserfs_write_lock_xattr_i(struct inode *inode)
86 {
87 down_write (&REISERFS_I(inode)->xattr_sem);
88 }
89 static inline void
90 reiserfs_write_unlock_xattr_i(struct inode *inode)
91 {
92 up_write (&REISERFS_I(inode)->xattr_sem);
93 }
94 static inline void
95 reiserfs_read_lock_xattr_i(struct inode *inode)
96 {
97 down_read (&REISERFS_I(inode)->xattr_sem);
98 }
99
100 static inline void
101 reiserfs_read_unlock_xattr_i(struct inode *inode)
102 {
103 up_read (&REISERFS_I(inode)->xattr_sem);
104 }
105
106 #else
107
108 #define is_reiserfs_priv_object(inode) 0
109 #define reiserfs_getxattr NULL
110 #define reiserfs_setxattr NULL
111 #define reiserfs_listxattr NULL
112 #define reiserfs_removexattr NULL
113 #define reiserfs_write_lock_xattrs(sb)
114 #define reiserfs_write_unlock_xattrs(sb)
115 #define reiserfs_read_lock_xattrs(sb)
116 #define reiserfs_read_unlock_xattrs(sb)
117
118 #define reiserfs_permission NULL
119
120 #define reiserfs_xattr_register_handlers() 0
121 #define reiserfs_xattr_unregister_handlers()
122
123 static inline int reiserfs_delete_xattrs (struct inode *inode) { return 0; };
124 static inline int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs) { return 0; };
125 static inline int reiserfs_xattr_init (struct super_block *sb, int mount_flags)
126 {
127 sb->s_flags = (sb->s_flags & ~MS_POSIXACL); /* to be sure */
128 return 0;
129 };
130 #endif
131
132 #endif /* __KERNEL__ */
133
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