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
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
26struct inode;
27struct dentry;
28struct iattr;
29struct super_block;
30struct nameidata;
31
32struct 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)
49ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
50			  void *buffer, size_t size);
51int reiserfs_setxattr(struct dentry *dentry, const char *name,
52		      const void *value, size_t size, int flags);
53ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
54int reiserfs_removexattr(struct dentry *dentry, const char *name);
55int reiserfs_delete_xattrs(struct inode *inode);
56int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
57int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
58int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd);
59
60int reiserfs_xattr_del(struct inode *, const char *);
61int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
62int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
63
64extern struct reiserfs_xattr_handler user_handler;
65extern struct reiserfs_xattr_handler trusted_handler;
66extern struct reiserfs_xattr_handler security_handler;
67
68int reiserfs_xattr_register_handlers(void) __init;
69void reiserfs_xattr_unregister_handlers(void);
70
71static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
72{
73	down_write(&REISERFS_XATTR_DIR_SEM(sb));
74}
75static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
76{
77	up_write(&REISERFS_XATTR_DIR_SEM(sb));
78}
79static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
80{
81	down_read(&REISERFS_XATTR_DIR_SEM(sb));
82}
83
84static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
85{
86	up_read(&REISERFS_XATTR_DIR_SEM(sb));
87}
88
89static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
90{
91	down_write(&REISERFS_I(inode)->xattr_sem);
92}
93static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
94{
95	up_write(&REISERFS_I(inode)->xattr_sem);
96}
97static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
98{
99	down_read(&REISERFS_I(inode)->xattr_sem);
100}
101
102static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
103{
104	up_read(&REISERFS_I(inode)->xattr_sem);
105}
106
107static inline void reiserfs_mark_inode_private(struct inode *inode)
108{
109	inode->i_flags |= S_PRIVATE;
110}
111
112static 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
135static inline int reiserfs_delete_xattrs(struct inode *inode)
136{
137	return 0;
138};
139static inline int reiserfs_chown_xattrs(struct inode *inode,
140					struct iattr *attrs)
141{
142	return 0;
143};
144static 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};
149static 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