1/*
 2 * linux/fs/ext2/xattr_user.c
 3 * Handler for extended user attributes.
 4 *
 5 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
 6 */
 7
 8#include <linux/init.h>
 9#include <linux/string.h>
10#include "ext2.h"
11#include "xattr.h"
12
13static size_t
14ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
15		const char *name, size_t name_len, int type)
16{
17	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
18	const size_t total_len = prefix_len + name_len + 1;
19
20	if (!test_opt(dentry->d_sb, XATTR_USER))
21		return 0;
22
23	if (list && total_len <= list_size) {
24		memcpy(list, XATTR_USER_PREFIX, prefix_len);
25		memcpy(list+prefix_len, name, name_len);
26		list[prefix_len + name_len] = '\0';
27	}
28	return total_len;
29}
30
31static int
32ext2_xattr_user_get(struct dentry *dentry, const char *name,
33		void *buffer, size_t size, int type)
34{
35	if (strcmp(name, "") == 0)
36		return -EINVAL;
37	if (!test_opt(dentry->d_sb, XATTR_USER))
38		return -EOPNOTSUPP;
39	return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
40			      name, buffer, size);
41}
42
43static int
44ext2_xattr_user_set(struct dentry *dentry, const char *name,
45		const void *value, size_t size, int flags, int type)
46{
47	if (strcmp(name, "") == 0)
48		return -EINVAL;
49	if (!test_opt(dentry->d_sb, XATTR_USER))
50		return -EOPNOTSUPP;
51
52	return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
53			      name, value, size, flags);
54}
55
56const struct xattr_handler ext2_xattr_user_handler = {
57	.prefix	= XATTR_USER_PREFIX,
58	.list	= ext2_xattr_user_list,
59	.get	= ext2_xattr_user_get,
60	.set	= ext2_xattr_user_set,
61};