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Linux kernel mirror (for testing)
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linux
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);
44
45#ifdef CONFIG_REISERFS_FS_XATTR
46#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
47ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
48 void *buffer, size_t size);
49int reiserfs_setxattr(struct dentry *dentry, const char *name,
50 const void *value, size_t size, int flags);
51ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
52int reiserfs_removexattr(struct dentry *dentry, const char *name);
53int reiserfs_permission(struct inode *inode, int mask);
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 struct xattr_handler reiserfs_xattr_user_handler;
62extern struct xattr_handler reiserfs_xattr_trusted_handler;
63extern struct xattr_handler reiserfs_xattr_security_handler;
64#ifdef CONFIG_REISERFS_FS_SECURITY
65int reiserfs_security_init(struct inode *dir, struct inode *inode,
66 struct reiserfs_security_handle *sec);
67int reiserfs_security_write(struct reiserfs_transaction_handle *th,
68 struct inode *inode,
69 struct reiserfs_security_handle *sec);
70void reiserfs_security_free(struct reiserfs_security_handle *sec);
71#endif
72
73#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
74static 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 */
95static 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
108static 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#define reiserfs_permission NULL
121
122static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
123{
124}
125#endif /* CONFIG_REISERFS_FS_XATTR */
126
127#ifndef CONFIG_REISERFS_FS_SECURITY
128static inline int reiserfs_security_init(struct inode *dir,
129 struct inode *inode,
130 struct reiserfs_security_handle *sec)
131{
132 return 0;
133}
134static inline int
135reiserfs_security_write(struct reiserfs_transaction_handle *th,
136 struct inode *inode,
137 struct reiserfs_security_handle *sec)
138{
139 return 0;
140}
141static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
142{}
143#endif
144
145#endif /* __KERNEL__ */
146
147#endif /* _LINUX_REISERFS_XATTR_H */