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(const struct xattr_handler *handler,
13			struct dentry *dentry, char *list, size_t list_size,
14			const char *name, size_t name_len)
15{
16	const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
17	const size_t total_len = prefix_len + name_len + 1;
18
19	if (!capable(CAP_SYS_ADMIN))
20		return 0;
21
22	if (list && total_len <= list_size) {
23		memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
24		memcpy(list+prefix_len, name, name_len);
25		list[prefix_len + name_len] = '\0';
26	}
27	return total_len;
28}
29
30static int
31ext2_xattr_trusted_get(const struct xattr_handler *handler,
32		       struct dentry *dentry, const char *name,
33		       void *buffer, size_t size)
34{
35	if (strcmp(name, "") == 0)
36		return -EINVAL;
37	return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_TRUSTED, name,
38			      buffer, size);
39}
40
41static int
42ext2_xattr_trusted_set(const struct xattr_handler *handler,
43		       struct dentry *dentry, const char *name,
44		       const void *value, size_t size, int flags)
45{
46	if (strcmp(name, "") == 0)
47		return -EINVAL;
48	return ext2_xattr_set(d_inode(dentry), EXT2_XATTR_INDEX_TRUSTED, name,
49			      value, size, flags);
50}
51
52const struct xattr_handler ext2_xattr_trusted_handler = {
53	.prefix	= XATTR_TRUSTED_PREFIX,
54	.list	= ext2_xattr_trusted_list,
55	.get	= ext2_xattr_trusted_get,
56	.set	= ext2_xattr_trusted_set,
57};
58