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69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2007 Kay Sievers <kay.sievers@vrfy.org>
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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 <byteswap.h>
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#include "libvolume_id.h"
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#include "libvolume_id-private.h"
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#include "util.h"
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/* http://www.snia.org/standards/home */
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#define DDF_HEADER 0xDE11DE11
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#define DDF_GUID_LENGTH 24
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#define DDF_REV_LENGTH 8
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struct ddf_header {
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uint32_t signature;
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uint32_t crc;
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uint8_t guid[DDF_GUID_LENGTH];
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uint8_t ddf_rev[DDF_REV_LENGTH];
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} PACKED;
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int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
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{
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uint64_t ddf_off = ((size / 0x200)-1) * 0x200;
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const uint8_t *buf;
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struct ddf_header *ddf;
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info("probing at offset 0x%llx, size 0x%llx\n",
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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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buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
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if (buf == NULL)
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return -1;
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ddf = (struct ddf_header *) buf;
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if (ddf->signature != cpu_to_be32(DDF_HEADER))
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return -1;
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volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
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snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
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volume_id_set_usage(id, VOLUME_ID_RAID);
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id->type = "ddf_raid_member";
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return 0;
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}
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