blob: 1abd8f92c4402a86a992e10e8e3261fd635eea10 [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
15#define XATTR_USER_PREFIX "user."
16
17static size_t
18ext3_xattr_user_list(struct inode *inode, char *list, size_t list_size,
19 const char *name, size_t name_len)
20{
21 const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
22 const size_t total_len = prefix_len + name_len + 1;
23
24 if (!test_opt(inode->i_sb, XATTR_USER))
25 return 0;
26
27 if (list && total_len <= list_size) {
28 memcpy(list, XATTR_USER_PREFIX, prefix_len);
29 memcpy(list+prefix_len, name, name_len);
30 list[prefix_len + name_len] = '\0';
31 }
32 return total_len;
33}
34
35static int
36ext3_xattr_user_get(struct inode *inode, const char *name,
37 void *buffer, size_t size)
38{
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 if (strcmp(name, "") == 0)
40 return -EINVAL;
41 if (!test_opt(inode->i_sb, XATTR_USER))
42 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size);
44}
45
46static int
47ext3_xattr_user_set(struct inode *inode, const char *name,
48 const void *value, size_t size, int flags)
49{
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 if (strcmp(name, "") == 0)
51 return -EINVAL;
52 if (!test_opt(inode->i_sb, XATTR_USER))
53 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name,
55 value, size, flags);
56}
57
58struct xattr_handler ext3_xattr_user_handler = {
59 .prefix = XATTR_USER_PREFIX,
60 .list = ext3_xattr_user_list,
61 .get = ext3_xattr_user_get,
62 .set = ext3_xattr_user_set,
63};