Line data Source code
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 :
14 : static size_t
15 : ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
16 : const char *name, size_t name_len, int type)
17 : {
18 4 : const size_t prefix_len = XATTR_USER_PREFIX_LEN;
19 4 : const size_t total_len = prefix_len + name_len + 1;
20 2 :
21 8 : if (!test_opt(dentry->d_sb, XATTR_USER))
22 2 : return 0;
23 :
24 8 : if (list && total_len <= list_size) {
25 2 : memcpy(list, XATTR_USER_PREFIX, prefix_len);
26 2 : memcpy(list+prefix_len, name, name_len);
27 2 : list[prefix_len + name_len] = '\0';
28 : }
29 2 : return total_len;
30 : }
31 :
32 : static int
33 : ext2_xattr_user_get(struct dentry *dentry, const char *name,
34 : void *buffer, size_t size, int type)
35 : {
36 8 : if (strcmp(name, "") == 0)
37 4 : return -EINVAL;
38 10 : if (!test_opt(dentry->d_sb, XATTR_USER))
39 2 : return -EOPNOTSUPP;
40 8 : return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
41 : name, buffer, size);
42 : }
43 :
44 : static int
45 : ext2_xattr_user_set(struct dentry *dentry, const char *name,
46 : const void *value, size_t size, int flags, int type)
47 : {
48 8 : if (strcmp(name, "") == 0)
49 4 : return -EINVAL;
50 10 : if (!test_opt(dentry->d_sb, XATTR_USER))
51 2 : return -EOPNOTSUPP;
52 :
53 8 : return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
54 : name, value, size, flags);
55 : }
56 :
57 1 : struct xattr_handler ext2_xattr_user_handler = {
58 : .prefix = XATTR_USER_PREFIX,
59 : .list = ext2_xattr_user_list,
60 : .get = ext2_xattr_user_get,
61 : .set = ext2_xattr_user_set,
62 : };
|