1/*
 2 * linux/fs/ext3/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 "ext3.h"
 9#include "xattr.h"
10
11static size_t
12ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
13		const char *name, size_t name_len, int type)
14{
15	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
16	const size_t total_len = prefix_len + name_len + 1;
17
18	if (!test_opt(dentry->d_sb, XATTR_USER))
19		return 0;
20
21	if (list && total_len <= list_size) {
22		memcpy(list, XATTR_USER_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
30ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
31		size_t size, int type)
32{
33	if (strcmp(name, "") == 0)
34		return -EINVAL;
35	if (!test_opt(dentry->d_sb, XATTR_USER))
36		return -EOPNOTSUPP;
37	return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER,
38			      name, buffer, size);
39}
40
41static int
42ext3_xattr_user_set(struct dentry *dentry, const char *name,
43		const void *value, size_t size, int flags, int type)
44{
45	if (strcmp(name, "") == 0)
46		return -EINVAL;
47	if (!test_opt(dentry->d_sb, XATTR_USER))
48		return -EOPNOTSUPP;
49	return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER,
50			      name, value, size, flags);
51}
52
53const struct xattr_handler ext3_xattr_user_handler = {
54	.prefix	= XATTR_USER_PREFIX,
55	.list	= ext3_xattr_user_list,
56	.get	= ext3_xattr_user_get,
57	.set	= ext3_xattr_user_set,
58};