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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
13struct reiserfs_xattr_header {
14 __le32 h_magic; /* magic number for identification */
15 __le32 h_hash; /* hash of the value */
16};
17
18struct 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
32struct inode;
33struct dentry;
34struct iattr;
35struct super_block;
36struct nameidata;
37
38int reiserfs_xattr_register_handlers(void) __init;
39void reiserfs_xattr_unregister_handlers(void);
40int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
41int reiserfs_lookup_privroot(struct super_block *sb);
42int reiserfs_delete_xattrs(struct inode *inode);
43int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
44int 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)
48ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
49 void *buffer, size_t size);
50int reiserfs_setxattr(struct dentry *dentry, const char *name,
51 const void *value, size_t size, int flags);
52ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
53int reiserfs_removexattr(struct dentry *dentry, const char *name);
54
55int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
56int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
57int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
58 struct inode *, const char *, const void *,
59 size_t, int);
60
61extern const struct xattr_handler reiserfs_xattr_user_handler;
62extern const struct xattr_handler reiserfs_xattr_trusted_handler;
63extern const struct xattr_handler reiserfs_xattr_security_handler;
64#ifdef CONFIG_REISERFS_FS_SECURITY
65int reiserfs_security_init(struct inode *dir, struct inode *inode,
66 const struct qstr *qstr,
67 struct reiserfs_security_handle *sec);
68int reiserfs_security_write(struct reiserfs_transaction_handle *th,
69 struct inode *inode,
70 struct reiserfs_security_handle *sec);
71void reiserfs_security_free(struct reiserfs_security_handle *sec);
72#endif
73
74static inline int reiserfs_xattrs_initialized(struct super_block *sb)
75{
76 return REISERFS_SB(sb)->priv_root != NULL;
77}
78
79#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
80static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
81{
82 loff_t ret = 0;
83 if (reiserfs_file_data_log(inode)) {
84 ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
85 ret >>= inode->i_sb->s_blocksize_bits;
86 }
87 return ret;
88}
89
90/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
91 * Let's try to be smart about it.
92 * xattr root: We cache it. If it's not cached, we may need to create it.
93 * xattr dir: If anything has been loaded for this inode, we can set a flag
94 * saying so.
95 * xattr file: Since we don't cache xattrs, we can't tell. We always include
96 * blocks for it.
97 *
98 * However, since root and dir can be created between calls - YOU MUST SAVE
99 * THIS VALUE.
100 */
101static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
102{
103 size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
104
105 if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
106 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
107 if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
108 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
109 }
110
111 return nblocks;
112}
113
114static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
115{
116 init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
117}
118
119#else
120
121#define reiserfs_getxattr NULL
122#define reiserfs_setxattr NULL
123#define reiserfs_listxattr NULL
124#define reiserfs_removexattr NULL
125
126static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
127{
128}
129#endif /* CONFIG_REISERFS_FS_XATTR */
130
131#ifndef CONFIG_REISERFS_FS_SECURITY
132static inline int reiserfs_security_init(struct inode *dir,
133 struct inode *inode,
134 const struct qstr *qstr,
135 struct reiserfs_security_handle *sec)
136{
137 return 0;
138}
139static inline int
140reiserfs_security_write(struct reiserfs_transaction_handle *th,
141 struct inode *inode,
142 struct reiserfs_security_handle *sec)
143{
144 return 0;
145}
146static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
147{}
148#endif
149
150#endif /* __KERNEL__ */
151
152#endif /* _LINUX_REISERFS_XATTR_H */