1/*
 2 * linux/fs/ext2/xattr_trusted.c
 3 * Handler for trusted extended attributes.
 4 *
 5 * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
 6 */
 7
 8#include "ext2.h"
 9#include "xattr.h"
10
11static size_t
12ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
13		const char *name, size_t name_len, int type)
14{
15	const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
16	const size_t total_len = prefix_len + name_len + 1;
17
18	if (!capable(CAP_SYS_ADMIN))
19		return 0;
20
21	if (list && total_len <= list_size) {
22		memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
23		memcpy(list+prefix_len, name, name_len);
24		list[prefix_len + name_len] = '\0';
25	}
26	return total_len;
27}
28
29static int
30ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
31		void *buffer, size_t size, int type)
32{
33	if (strcmp(name, "") == 0)
34		return -EINVAL;
35	return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
36			      buffer, size);
37}
38
39static int
40ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
41		const void *value, size_t size, int flags, int type)
42{
43	if (strcmp(name, "") == 0)
44		return -EINVAL;
45	return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
46			      value, size, flags);
47}
48
49const struct xattr_handler ext2_xattr_trusted_handler = {
50	.prefix	= XATTR_TRUSTED_PREFIX,
51	.list	= ext2_xattr_trusted_list,
52	.get	= ext2_xattr_trusted_get,
53	.set	= ext2_xattr_trusted_set,
54};