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 struct reiserfs_security_handle {
19 char *name;
20 void *value;
21 size_t length;
22 };
23
24 #ifdef __KERNEL__
25
26 #include <linux/init.h>
27 #include <linux/list.h>
28 #include <linux/rwsem.h>
29 #include <linux/reiserfs_fs_i.h>
30 #include <linux/reiserfs_fs.h>
31
32 struct inode;
33 struct dentry;
34 struct iattr;
35 struct super_block;
36 struct nameidata;
37
38 int reiserfs_xattr_register_handlers(void) __init;
39 void reiserfs_xattr_unregister_handlers(void);
40 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
41 int reiserfs_lookup_privroot(struct super_block *sb);
42 int reiserfs_delete_xattrs(struct inode *inode);
43 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
44 int reiserfs_permission(struct inode *inode, int mask);
45
46 #ifdef CONFIG_REISERFS_FS_XATTR
47 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
48 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
49 void *buffer, size_t size);
50 int reiserfs_setxattr(struct dentry *dentry, const char *name,
51 const void *value, size_t size, int flags);
52 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
53 int reiserfs_removexattr(struct dentry *dentry, const char *name);
54
55 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
56 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
57 int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
58 struct inode *, const char *, const void *,
59 size_t, int);
60
61 extern struct xattr_handler reiserfs_xattr_user_handler;
62 extern struct xattr_handler reiserfs_xattr_trusted_handler;
63 extern struct xattr_handler reiserfs_xattr_security_handler;
64 #ifdef CONFIG_REISERFS_FS_SECURITY
65 int reiserfs_security_init(struct inode *dir, struct inode *inode,
66 struct reiserfs_security_handle *sec);
67 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
68 struct inode *inode,
69 struct reiserfs_security_handle *sec);
70 void reiserfs_security_free(struct reiserfs_security_handle *sec);
71 #endif
72
73 #define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
74 static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
75 {
76 loff_t ret = 0;
77 if (reiserfs_file_data_log(inode)) {
78 ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
79 ret >>= inode->i_sb->s_blocksize_bits;
80 }
81 return ret;
82 }
83
84 /* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
85 * Let's try to be smart about it.
86 * xattr root: We cache it. If it's not cached, we may need to create it.
87 * xattr dir: If anything has been loaded for this inode, we can set a flag
88 * saying so.
89 * xattr file: Since we don't cache xattrs, we can't tell. We always include
90 * blocks for it.
91 *
92 * However, since root and dir can be created between calls - YOU MUST SAVE
93 * THIS VALUE.
94 */
95 static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
96 {
97 size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
98
99 if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
100 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
101 if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
102 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
103 }
104
105 return nblocks;
106 }
107
108 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
109 {
110 init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
111 }
112
113 #else
114
115 #define reiserfs_getxattr NULL
116 #define reiserfs_setxattr NULL
117 #define reiserfs_listxattr NULL
118 #define reiserfs_removexattr NULL
119
120 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
121 {
122 }
123 #endif /* CONFIG_REISERFS_FS_XATTR */
124
125 #ifndef CONFIG_REISERFS_FS_SECURITY
126 static inline int reiserfs_security_init(struct inode *dir,
127 struct inode *inode,
128 struct reiserfs_security_handle *sec)
129 {
130 return 0;
131 }
132 static inline int
133 reiserfs_security_write(struct reiserfs_transaction_handle *th,
134 struct inode *inode,
135 struct reiserfs_security_handle *sec)
136 {
137 return 0;
138 }
139 static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
140 {}
141 #endif
142
143 #endif /* __KERNEL__ */
144
145 #endif /* _LINUX_REISERFS_XATTR_H */
146
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