summaryrefslogtreecommitdiffstats
path: root/libblkid/src/superblocks/silicon_raid.c
blob: 399eea8c4ec6e49b7715fcf3d4f5d7bd262fd9d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
 *
 * Inspired by libvolume_id by
 *     Kay Sievers <kay.sievers@vrfy.org>
 *
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include <stddef.h>

#include "superblocks.h"

struct silicon_metadata {
	uint8_t		unknown0[0x2E];
	uint8_t		ascii_version[0x36 - 0x2E];
	int8_t		diskname[0x56 - 0x36];
	int8_t		unknown1[0x60 - 0x56];
	uint32_t	magic;
	int8_t		unknown1a[0x6C - 0x64];
	uint32_t	array_sectors_low;
	uint32_t	array_sectors_high;
	int8_t		unknown2[0x78 - 0x74];
	uint32_t	thisdisk_sectors;
	int8_t		unknown3[0x100 - 0x7C];
	int8_t		unknown4[0x104 - 0x100];
	uint16_t	product_id;
	uint16_t	vendor_id;
	uint16_t	minor_ver;
	uint16_t	major_ver;
	uint8_t		seconds;
	uint8_t		minutes;
	uint8_t		hour;
	uint8_t		day;
	uint8_t		month;
	uint8_t		year;
	uint16_t	raid0_stride;
	int8_t		unknown6[0x116 - 0x114];
	uint8_t		disk_number;
	uint8_t		type;			/* SILICON_TYPE_* */
	int8_t		drives_per_striped_set;
	int8_t		striped_set_number;
	int8_t		drives_per_mirrored_set;
	int8_t		mirrored_set_number;
	uint32_t	rebuild_ptr_low;
	uint32_t	rebuild_ptr_high;
	uint32_t	incarnation_no;
	uint8_t		member_status;
	uint8_t		mirrored_set_state;	/* SILICON_MIRROR_* */
	uint8_t		reported_device_location;
	uint8_t		idechannel;
	uint8_t		auto_rebuild;
	uint8_t		unknown8;
	uint8_t		text_type[0x13E - 0x12E];
	uint16_t	checksum1;
	int8_t		assumed_zeros[0x1FE - 0x140];
	uint16_t	checksum2;
} __attribute__((packed));

#define SILICON_MAGIC		0x2F000000

static uint16_t silraid_checksum(struct silicon_metadata *sil)
{
	int sum = 0;
	unsigned short count = offsetof(struct silicon_metadata, checksum1) / 2;
	unsigned char *ptr = (unsigned char *) sil;

	while (count--) {
		uint16_t val;

		memcpy(&val, ptr, sizeof(uint16_t));
		sum += le16_to_cpu(val);

		ptr += sizeof(uint16_t);
	}

	return (-sum & 0xFFFF);
}

static int probe_silraid(blkid_probe pr,
		const struct blkid_idmag *mag __attribute__((__unused__)))
{
	uint64_t off;
	struct silicon_metadata *sil;

	if (pr->size < 0x10000)
		return 1;
	if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
		return 1;

	off = ((pr->size / 0x200) - 1) * 0x200;

	sil = (struct silicon_metadata *)
			blkid_probe_get_buffer(pr, off,
				sizeof(struct silicon_metadata));
	if (!sil)
		return errno ? -errno : 1;

	if (le32_to_cpu(sil->magic) != SILICON_MAGIC)
		return 1;
	if (sil->disk_number >= 8)
		return 1;
	if (!blkid_probe_verify_csum(pr, silraid_checksum(sil), le16_to_cpu(sil->checksum1)))
		return 1;

	if (blkid_probe_sprintf_version(pr, "%u.%u",
				le16_to_cpu(sil->major_ver),
				le16_to_cpu(sil->minor_ver)) != 0)
		return 1;

	if (blkid_probe_set_magic(pr,
			off + offsetof(struct silicon_metadata, magic),
			sizeof(sil->magic),
			(unsigned char *) &sil->magic))
		return 1;
	return 0;
}

const struct blkid_idinfo silraid_idinfo = {
	.name		= "silicon_medley_raid_member",
	.usage		= BLKID_USAGE_RAID,
	.probefunc	= probe_silraid,
	.magics		= BLKID_NONE_MAGIC
};