1/*
2 * linux/fs/ext4/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/string.h>
9#include <linux/fs.h>
10#include "ext4_jbd2.h"
11#include "ext4.h"
12#include "xattr.h"
13
14static size_t
15ext4_xattr_user_list(const struct xattr_handler *handler,
16		     struct dentry *dentry, char *list, size_t list_size,
17		     const char *name, size_t name_len)
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
34ext4_xattr_user_get(const struct xattr_handler *handler,
35		    struct dentry *dentry, const char *name,
36		    void *buffer, size_t size)
37{
38	if (strcmp(name, "") == 0)
39		return -EINVAL;
40	if (!test_opt(dentry->d_sb, XATTR_USER))
41		return -EOPNOTSUPP;
42	return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_USER,
43			      name, buffer, size);
44}
45
46static int
47ext4_xattr_user_set(const struct xattr_handler *handler,
48		    struct dentry *dentry, const char *name,
49		    const void *value, size_t size, int flags)
50{
51	if (strcmp(name, "") == 0)
52		return -EINVAL;
53	if (!test_opt(dentry->d_sb, XATTR_USER))
54		return -EOPNOTSUPP;
55	return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_USER,
56			      name, value, size, flags);
57}
58
59const struct xattr_handler ext4_xattr_user_handler = {
60	.prefix	= XATTR_USER_PREFIX,
61	.list	= ext4_xattr_user_list,
62	.get	= ext4_xattr_user_get,
63	.set	= ext4_xattr_user_set,
64};
65