Root/fs/ext4/xattr_user.c

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

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