1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2007 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 *	This program is free software; you can redistribute it and/or modify it
7 *	under the terms of the GNU General Public License as published by the
8 *	Free Software Foundation version 2 of the License.
9 */
10
11#ifndef _GNU_SOURCE
12#define _GNU_SOURCE 1
13#endif
14
15#ifdef HAVE_CONFIG_H
16#  include <config.h>
17#endif
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <unistd.h>
22#include <string.h>
23#include <errno.h>
24#include <ctype.h>
25#include <byteswap.h>
26
27#include "libvolume_id.h"
28#include "util.h"
29
30/* http://www.snia.org/standards/home */
31
32#define DDF_HEADER			0xDE11DE11
33#define DDF_GUID_LENGTH			24
34#define DDF_REV_LENGTH			8
35
36static struct ddf_header {
37	uint32_t	signature;
38	uint32_t	crc;
39	uint8_t		guid[DDF_GUID_LENGTH];
40	uint8_t		ddf_rev[DDF_REV_LENGTH];
41} PACKED *ddf;
42
43int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
44{
45	uint64_t ddf_off = ((size / 0x200)-1) * 0x200;
46	const uint8_t *buf;
47
48	info("probing at offset 0x%llx, size 0x%llx",
49	    (unsigned long long) off, (unsigned long long) size);
50	if (size < 0x10000)
51		return -1;
52
53	buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
54	if (buf == NULL)
55		return -1;
56	ddf = (struct ddf_header *) buf;
57
58	if (ddf->signature != cpu_to_be32(DDF_HEADER))
59		return -1;
60
61	volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
62	snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
63	volume_id_set_usage(id, VOLUME_ID_RAID);
64	id->type = "ddf_raid_member";
65	return 0;
66}
67