tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/fs/ext2/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/init.h>
9#include <linux/module.h>
10#include <linux/string.h>
11#include "ext2.h"
12#include "xattr.h"
13
14static size_t
15ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size,
16 const char *name, size_t name_len)
17{
18 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
19 const size_t total_len = prefix_len + name_len + 1;
20
21 if (!test_opt(inode->i_sb, XATTR_USER))
22 return 0;
23
24 if (list && total_len <= list_size) {
25 memcpy(list, XATTR_USER_PREFIX, prefix_len);
26 memcpy(list+prefix_len, name, name_len);
27 list[prefix_len + name_len] = '\0';
28 }
29 return total_len;
30}
31
32static int
33ext2_xattr_user_get(struct inode *inode, const char *name,
34 void *buffer, size_t size)
35{
36 if (strcmp(name, "") == 0)
37 return -EINVAL;
38 if (!test_opt(inode->i_sb, XATTR_USER))
39 return -EOPNOTSUPP;
40 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
41}
42
43static int
44ext2_xattr_user_set(struct inode *inode, const char *name,
45 const void *value, size_t size, int flags)
46{
47 if (strcmp(name, "") == 0)
48 return -EINVAL;
49 if (!test_opt(inode->i_sb, XATTR_USER))
50 return -EOPNOTSUPP;
51
52 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
53 value, size, flags);
54}
55
56struct xattr_handler ext2_xattr_user_handler = {
57 .prefix = XATTR_USER_PREFIX,
58 .list = ext2_xattr_user_list,
59 .get = ext2_xattr_user_get,
60 .set = ext2_xattr_user_set,
61};