xattr_trusted.c revision 3264d4ded4d916d294d776b77b72d477c63ac3be 
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
10static int
11trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
12{
13	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
14		return -EINVAL;
15
16	if (!reiserfs_xattrs(inode->i_sb))
17		return -EOPNOTSUPP;
18
19	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
20		return -EPERM;
21
22	return reiserfs_xattr_get(inode, name, buffer, size);
23}
24
25static int
26trusted_set(struct inode *inode, const char *name, const void *buffer,
27	    size_t size, int flags)
28{
29	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
30		return -EINVAL;
31
32	if (!reiserfs_xattrs(inode->i_sb))
33		return -EOPNOTSUPP;
34
35	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
36		return -EPERM;
37
38	return reiserfs_xattr_set(inode, name, buffer, size, flags);
39}
40
41static int trusted_del(struct inode *inode, const char *name)
42{
43	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
44		return -EINVAL;
45
46	if (!reiserfs_xattrs(inode->i_sb))
47		return -EOPNOTSUPP;
48
49	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
50		return -EPERM;
51
52	return 0;
53}
54
55static int
56trusted_list(struct inode *inode, const char *name, int namelen, char *out)
57{
58	int len = namelen;
59
60	if (!reiserfs_xattrs(inode->i_sb))
61		return 0;
62
63	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
64		return 0;
65
66	if (out)
67		memcpy(out, name, len);
68
69	return len;
70}
71
72struct reiserfs_xattr_handler trusted_handler = {
73	.prefix = XATTR_TRUSTED_PREFIX,
74	.get = trusted_get,
75	.set = trusted_set,
76	.del = trusted_del,
77	.list = trusted_list,
78};
79