1/*
2 * Copyright IBM Corporation, 2010
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 */
14
15
16#include <linux/module.h>
17#include <linux/string.h>
18#include <linux/fs.h>
19#include <linux/slab.h>
20#include "xattr.h"
21
22static int v9fs_xattr_user_get(struct dentry *dentry, const char *name,
23			void *buffer, size_t size, int type)
24{
25	int retval;
26	char *full_name;
27	size_t name_len;
28	size_t prefix_len = XATTR_USER_PREFIX_LEN;
29
30	if (name == NULL)
31		return -EINVAL;
32
33	if (strcmp(name, "") == 0)
34		return -EINVAL;
35
36	name_len = strlen(name);
37	full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
38	if (!full_name)
39		return -ENOMEM;
40	memcpy(full_name, XATTR_USER_PREFIX, prefix_len);
41	memcpy(full_name+prefix_len, name, name_len);
42	full_name[prefix_len + name_len] = '\0';
43
44	retval = v9fs_xattr_get(dentry, full_name, buffer, size);
45	kfree(full_name);
46	return retval;
47}
48
49static int v9fs_xattr_user_set(struct dentry *dentry, const char *name,
50			const void *value, size_t size, int flags, int type)
51{
52	int retval;
53	char *full_name;
54	size_t name_len;
55	size_t prefix_len = XATTR_USER_PREFIX_LEN;
56
57	if (name == NULL)
58		return -EINVAL;
59
60	if (strcmp(name, "") == 0)
61		return -EINVAL;
62
63	name_len = strlen(name);
64	full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
65	if (!full_name)
66		return -ENOMEM;
67	memcpy(full_name, XATTR_USER_PREFIX, prefix_len);
68	memcpy(full_name + prefix_len, name, name_len);
69	full_name[prefix_len + name_len] = '\0';
70
71	retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
72	kfree(full_name);
73	return retval;
74}
75
76struct xattr_handler v9fs_xattr_user_handler = {
77	.prefix	= XATTR_USER_PREFIX,
78	.get	= v9fs_xattr_user_get,
79	.set	= v9fs_xattr_user_set,
80};
81