blob: 0327497a55ce0a58baa9ce2d855cd7ecad762625 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext3/xattr_trusted.c
3 * Handler for trusted extended attributes.
4 *
5 * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 */
7
8#include <linux/module.h>
9#include <linux/string.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080010#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/ext3_jbd.h>
13#include <linux/ext3_fs.h>
14#include "xattr.h"
15
16#define XATTR_TRUSTED_PREFIX "trusted."
17
18static size_t
19ext3_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
20 const char *name, size_t name_len)
21{
22 const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1;
23 const size_t total_len = prefix_len + name_len + 1;
24
25 if (!capable(CAP_SYS_ADMIN))
26 return 0;
27
28 if (list && total_len <= list_size) {
29 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
30 memcpy(list+prefix_len, name, name_len);
31 list[prefix_len + name_len] = '\0';
32 }
33 return total_len;
34}
35
36static int
37ext3_xattr_trusted_get(struct inode *inode, const char *name,
38 void *buffer, size_t size)
39{
40 if (strcmp(name, "") == 0)
41 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 return ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED, name,
43 buffer, size);
44}
45
46static int
47ext3_xattr_trusted_set(struct inode *inode, const char *name,
48 const void *value, size_t size, int flags)
49{
50 if (strcmp(name, "") == 0)
51 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return ext3_xattr_set(inode, EXT3_XATTR_INDEX_TRUSTED, name,
53 value, size, flags);
54}
55
56struct xattr_handler ext3_xattr_trusted_handler = {
57 .prefix = XATTR_TRUSTED_PREFIX,
58 .list = ext3_xattr_trusted_list,
59 .get = ext3_xattr_trusted_get,
60 .set = ext3_xattr_trusted_set,
61};