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