1#include "reiserfs.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 "xattr.h"
8#include <linux/uaccess.h>
9
10static int
11trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
12	    int handler_flags)
13{
14	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
15		return -EINVAL;
16
17	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
18		return -EPERM;
19
20	return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
21}
22
23static int
24trusted_set(struct dentry *dentry, const char *name, const void *buffer,
25	    size_t size, int flags, int handler_flags)
26{
27	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
28		return -EINVAL;
29
30	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
31		return -EPERM;
32
33	return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
34}
35
36static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
37			   const char *name, size_t name_len, int handler_flags)
38{
39	const size_t len = name_len + 1;
40
41	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
42		return 0;
43
44	if (list && len <= list_size) {
45		memcpy(list, name, name_len);
46		list[name_len] = '\0';
47	}
48	return len;
49}
50
51const struct xattr_handler reiserfs_xattr_trusted_handler = {
52	.prefix = XATTR_TRUSTED_PREFIX,
53	.get = trusted_get,
54	.set = trusted_set,
55	.list = trusted_list,
56};
57