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 <linux/module.h>
 9#include <linux/string.h>
10#include <linux/fs.h>
11#include <linux/ext3_jbd.h>
12#include <linux/ext3_fs.h>
13#include "xattr.h"
14
15static size_t
16ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
17		const char *name, size_t name_len, int type)
18{
19	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
20	const size_t total_len = prefix_len + name_len + 1;
21
22	if (!test_opt(dentry->d_sb, XATTR_USER))
23		return 0;
24
25	if (list && total_len <= list_size) {
26		memcpy(list, XATTR_USER_PREFIX, prefix_len);
27		memcpy(list+prefix_len, name, name_len);
28		list[prefix_len + name_len] = '\0';
29	}
30	return total_len;
31}
32
33static int
34ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
35		size_t size, int type)
36{
37	if (strcmp(name, "") == 0)
38		return -EINVAL;
39	if (!test_opt(dentry->d_sb, XATTR_USER))
40		return -EOPNOTSUPP;
41	return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER,
42			      name, buffer, size);
43}
44
45static int
46ext3_xattr_user_set(struct dentry *dentry, const char *name,
47		const void *value, size_t size, int flags, int type)
48{
49	if (strcmp(name, "") == 0)
50		return -EINVAL;
51	if (!test_opt(dentry->d_sb, XATTR_USER))
52		return -EOPNOTSUPP;
53	return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER,
54			      name, value, size, flags);
55}
56
57const struct xattr_handler ext3_xattr_user_handler = {
58	.prefix	= XATTR_USER_PREFIX,
59	.list	= ext3_xattr_user_list,
60	.get	= ext3_xattr_user_get,
61	.set	= ext3_xattr_user_set,
62};