blob: 430fe63b31b397d37370758ac119eeb2139469bd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/ext3_jbd.h>
12#include <linux/ext3_fs.h>
13#include "xattr.h"
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015static size_t
16ext3_xattr_user_list(struct inode *inode, char *list, size_t list_size,
17 const char *name, size_t name_len)
18{
Shen Fengef1afd32008-07-25 01:46:23 -070019 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 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
34ext3_xattr_user_get(struct inode *inode, const char *name,
35 void *buffer, size_t size)
36{
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 if (strcmp(name, "") == 0)
38 return -EINVAL;
39 if (!test_opt(inode->i_sb, XATTR_USER))
40 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size);
42}
43
44static int
45ext3_xattr_user_set(struct inode *inode, const char *name,
46 const void *value, size_t size, int flags)
47{
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 if (strcmp(name, "") == 0)
49 return -EINVAL;
50 if (!test_opt(inode->i_sb, XATTR_USER))
51 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name,
53 value, size, flags);
54}
55
56struct xattr_handler ext3_xattr_user_handler = {
57 .prefix = XATTR_USER_PREFIX,
58 .list = ext3_xattr_user_list,
59 .get = ext3_xattr_user_get,
60 .set = ext3_xattr_user_set,
61};