1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 *	This library is free software; you can redistribute it and/or
7 *	modify it under the terms of the GNU Lesser General Public
8 *	License as published by the Free Software Foundation; either
9 *	version 2.1 of the License, or (at your option) any later version.
10 *
11 *	This library is distributed in the hope that it will be useful,
12 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 *	Lesser General Public License for more details.
15 *
16 *	You should have received a copy of the GNU Lesser General Public
17 *	License along with this library; if not, write to the Free Software
18 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include "volume_id_internal.h"
22
23struct lvm1_super_block {
24	uint8_t	id[2];
25} PACKED;
26
27struct lvm2_super_block {
28	uint8_t		id[8];
29	uint64_t	sector_xl;
30	uint32_t	crc_xl;
31	uint32_t	offset_xl;
32	uint8_t		type[8];
33} PACKED;
34
35#define LVM1_SB_OFF			0x400
36
37int FAST_FUNC volume_id_probe_lvm1(struct volume_id *id, uint64_t off)
38{
39	struct lvm1_super_block *lvm;
40
41	dbg("probing at offset 0x%llx", (unsigned long long) off);
42
43	lvm = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
44	if (lvm == NULL)
45		return -1;
46
47	if (lvm->id[0] != 'H' || lvm->id[1] != 'M')
48		return -1;
49
50//	volume_id_set_usage(id, VOLUME_ID_RAID);
51//	id->type = "LVM1_member";
52
53	return 0;
54}
55
56#define LVM2_LABEL_ID			"LABELONE"
57#define LVM2LABEL_SCAN_SECTORS		4
58
59int FAST_FUNC volume_id_probe_lvm2(struct volume_id *id, uint64_t off)
60{
61	const uint8_t *buf;
62	unsigned soff;
63	struct lvm2_super_block *lvm;
64
65	dbg("probing at offset 0x%llx", (unsigned long long) off);
66
67	buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
68	if (buf == NULL)
69		return -1;
70
71
72	for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
73		lvm = (struct lvm2_super_block *) &buf[soff];
74
75		if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
76			goto found;
77	}
78
79	return -1;
80
81 found:
82//	memcpy(id->type_version, lvm->type, 8);
83//	volume_id_set_usage(id, VOLUME_ID_RAID);
84//	id->type = "LVM2_member";
85
86	return 0;
87}
88