via_raid.c revision 2603474ff9be2418900581da1af5cccc9f13cae1
/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
*
* Based on information taken from dmraid:
* Copyright (C) 2004-2006 Heinz Mauelshagen, Red Hat GmbH
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "libvolume_id.h"
#include "libvolume_id-private.h"
#include "util.h"
struct via_meta {
uint16_t signature;
uint8_t version_number;
struct via_array {
uint16_t disk_bit_mask;
uint8_t disk_array_ex;
uint32_t capacity_low;
uint32_t capacity_high;
uint32_t serial_checksum;
} PACKED array;
uint32_t serial_checksum[8];
uint8_t checksum;
} PACKED;
#define VIA_SIGNATURE 0xAA55
/* 8 bit checksum on first 50 bytes of metadata. */
static uint8_t meta_checksum(struct via_meta *via)
{
uint8_t i = 50, sum = 0;
while (i--)
sum += ((uint8_t*) via)[i];
return sum == via->checksum;
}
int volume_id_probe_via_raid(struct volume_id *id, uint64_t off, uint64_t size)
{
const uint8_t *buf;
uint64_t meta_off;
struct via_meta *via;
dbg("probing at offset 0x%llx, size 0x%llx\n",
(unsigned long long) off, (unsigned long long) size);
if (size < 0x10000)
return -1;
meta_off = ((size / 0x200)-1) * 0x200;
buf = volume_id_get_buffer(id, off + meta_off, 0x200);
if (buf == NULL)
return -1;
via = (struct via_meta *) buf;
if (le16_to_cpu(via->signature) != VIA_SIGNATURE)
return -1;
if (via->version_number > 1)
return -1;
if (!meta_checksum(via))
return -1;
volume_id_set_usage(id, VOLUME_ID_RAID);
snprintf(id->type_version, sizeof(id->type_version)-1, "%u", via->version_number);
id->type = "via_raid_member";
return 0;
}