1#include <linux/reiserfs_fs.h>
2#include <linux/capability.h>
3#include <linux/errno.h>
4#include <linux/fs.h>
5#include <linux/pagemap.h>
6#include <linux/xattr.h>
7#include <linux/reiserfs_xattr.h>
8#include <asm/uaccess.h>
9
10#define XATTR_TRUSTED_PREFIX "trusted."
11
12static int
13trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
14{
15	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
16		return -EINVAL;
17
18	if (!reiserfs_xattrs(inode->i_sb))
19		return -EOPNOTSUPP;
20
21	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
22		return -EPERM;
23
24	return reiserfs_xattr_get(inode, name, buffer, size);
25}
26
27static int
28trusted_set(struct inode *inode, const char *name, const void *buffer,
29	    size_t size, int flags)
30{
31	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
32		return -EINVAL;
33
34	if (!reiserfs_xattrs(inode->i_sb))
35		return -EOPNOTSUPP;
36
37	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
38		return -EPERM;
39
40	return reiserfs_xattr_set(inode, name, buffer, size, flags);
41}
42
43static int trusted_del(struct inode *inode, const char *name)
44{
45	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
46		return -EINVAL;
47
48	if (!reiserfs_xattrs(inode->i_sb))
49		return -EOPNOTSUPP;
50
51	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
52		return -EPERM;
53
54	return 0;
55}
56
57static int
58trusted_list(struct inode *inode, const char *name, int namelen, char *out)
59{
60	int len = namelen;
61
62	if (!reiserfs_xattrs(inode->i_sb))
63		return 0;
64
65	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
66		return 0;
67
68	if (out)
69		memcpy(out, name, len);
70
71	return len;
72}
73
74struct reiserfs_xattr_handler trusted_handler = {
75	.prefix = XATTR_TRUSTED_PREFIX,
76	.get = trusted_get,
77	.set = trusted_set,
78	.del = trusted_del,
79	.list = trusted_list,
80};
81