1 /*
2 File: linux/reiserfs_xattr.h
3 */
4
5 #ifndef _LINUX_REISERFS_XATTR_H
6 #define _LINUX_REISERFS_XATTR_H
7
8 #include <linux/types.h>
9
10 /* Magic value in header */
11 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
12
13 struct reiserfs_xattr_header {
14 __le32 h_magic; /* magic number for identification */
15 __le32 h_hash; /* hash of the value */
16 };
17
18 #ifdef __KERNEL__
19
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/rwsem.h>
23 #include <linux/reiserfs_fs_i.h>
24 #include <linux/reiserfs_fs.h>
25
26 struct inode;
27 struct dentry;
28 struct iattr;
29 struct super_block;
30 struct nameidata;
31
32 struct reiserfs_xattr_handler {
33 char *prefix;
34 int (*init) (void);
35 void (*exit) (void);
36 int (*get) (struct inode * inode, const char *name, void *buffer,
37 size_t size);
38 int (*set) (struct inode * inode, const char *name, const void *buffer,
39 size_t size, int flags);
40 int (*del) (struct inode * inode, const char *name);
41 int (*list) (struct inode * inode, const char *name, int namelen,
42 char *out);
43 struct list_head handlers;
44 };
45
46 #ifdef CONFIG_REISERFS_FS_XATTR
47 #define is_reiserfs_priv_object(inode) IS_PRIVATE(inode)
48 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
49 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
50 void *buffer, size_t size);
51 int reiserfs_setxattr(struct dentry *dentry, const char *name,
52 const void *value, size_t size, int flags);
53 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
54 int reiserfs_removexattr(struct dentry *dentry, const char *name);
55 int reiserfs_delete_xattrs(struct inode *inode);
56 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
57 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
58 int reiserfs_permission(struct inode *inode, int mask);
59
60 int reiserfs_xattr_del(struct inode *, const char *);
61 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
62 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
63
64 extern struct reiserfs_xattr_handler user_handler;
65 extern struct reiserfs_xattr_handler trusted_handler;
66 extern struct reiserfs_xattr_handler security_handler;
67
68 int reiserfs_xattr_register_handlers(void) __init;
69 void reiserfs_xattr_unregister_handlers(void);
70
reiserfs_write_lock_xattrs(struct super_block * sb)71 static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
72 {
73 down_write(&REISERFS_XATTR_DIR_SEM(sb));
74 }
reiserfs_write_unlock_xattrs(struct super_block * sb)75 static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
76 {
77 up_write(&REISERFS_XATTR_DIR_SEM(sb));
78 }
reiserfs_read_lock_xattrs(struct super_block * sb)79 static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
80 {
81 down_read(&REISERFS_XATTR_DIR_SEM(sb));
82 }
83
reiserfs_read_unlock_xattrs(struct super_block * sb)84 static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
85 {
86 up_read(&REISERFS_XATTR_DIR_SEM(sb));
87 }
88
reiserfs_write_lock_xattr_i(struct inode * inode)89 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
90 {
91 down_write(&REISERFS_I(inode)->xattr_sem);
92 }
reiserfs_write_unlock_xattr_i(struct inode * inode)93 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
94 {
95 up_write(&REISERFS_I(inode)->xattr_sem);
96 }
reiserfs_read_lock_xattr_i(struct inode * inode)97 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
98 {
99 down_read(&REISERFS_I(inode)->xattr_sem);
100 }
101
reiserfs_read_unlock_xattr_i(struct inode * inode)102 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
103 {
104 up_read(&REISERFS_I(inode)->xattr_sem);
105 }
106
reiserfs_mark_inode_private(struct inode * inode)107 static inline void reiserfs_mark_inode_private(struct inode *inode)
108 {
109 inode->i_flags |= S_PRIVATE;
110 }
111
reiserfs_init_xattr_rwsem(struct inode * inode)112 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
113 {
114 init_rwsem(&REISERFS_I(inode)->xattr_sem);
115 }
116
117 #else
118
119 #define is_reiserfs_priv_object(inode) 0
120 #define reiserfs_mark_inode_private(inode) do {;} while(0)
121 #define reiserfs_getxattr NULL
122 #define reiserfs_setxattr NULL
123 #define reiserfs_listxattr NULL
124 #define reiserfs_removexattr NULL
125 #define reiserfs_write_lock_xattrs(sb) do {;} while(0)
126 #define reiserfs_write_unlock_xattrs(sb) do {;} while(0)
127 #define reiserfs_read_lock_xattrs(sb)
128 #define reiserfs_read_unlock_xattrs(sb)
129
130 #define reiserfs_permission NULL
131
132 #define reiserfs_xattr_register_handlers() 0
133 #define reiserfs_xattr_unregister_handlers()
134
reiserfs_delete_xattrs(struct inode * inode)135 static inline int reiserfs_delete_xattrs(struct inode *inode)
136 {
137 return 0;
138 };
reiserfs_chown_xattrs(struct inode * inode,struct iattr * attrs)139 static inline int reiserfs_chown_xattrs(struct inode *inode,
140 struct iattr *attrs)
141 {
142 return 0;
143 };
reiserfs_xattr_init(struct super_block * sb,int mount_flags)144 static inline int reiserfs_xattr_init(struct super_block *sb, int mount_flags)
145 {
146 sb->s_flags = (sb->s_flags & ~MS_POSIXACL); /* to be sure */
147 return 0;
148 };
reiserfs_init_xattr_rwsem(struct inode * inode)149 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
150 {
151 }
152 #endif /* CONFIG_REISERFS_FS_XATTR */
153
154 #endif /* __KERNEL__ */
155
156 #endif /* _LINUX_REISERFS_XATTR_H */
157