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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2007 Kay Sievers <kay.sievers@vrfy.org>
*
* 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, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <byteswap.h>
#include "libvolume_id.h"
#include "libvolume_id-private.h"
/* http://www.snia.org/standards/home */
#define DDF_GUID_LENGTH 24
#define DDF_REV_LENGTH 8
struct ddf_header {
uint8_t signature[4];
uint32_t crc;
uint8_t guid[DDF_GUID_LENGTH];
uint8_t ddf_rev[DDF_REV_LENGTH];
} PACKED;
int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
{
uint64_t ddf_off;
const uint8_t *buf;
struct ddf_header *ddf;
info("probing at offset 0x%llx, size 0x%llx\n",
(unsigned long long)off, (unsigned long long)size);
if (size < 0x30000)
return -1;
/* header at last sector */
ddf_off = ((size / 0x200)-1) * 0x200;
buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
if (buf == NULL)
return -1;
ddf = (struct ddf_header *) buf;
if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0) {
info("header (little endian) found at %llu\n", (unsigned long long)(off + ddf_off));
goto found;
}
if (memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0) {
info("header (big endian) found at %llu\n", (unsigned long long)(off + ddf_off));
goto found;
}
/* adaptec non-standard header location */
ddf_off = ((size / 0x200)-257) * 0x200;
buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
if (buf == NULL)
return -1;
ddf = (struct ddf_header *) buf;
if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0) {
info("header adaptec (little endian) found at %llu\n", (unsigned long long)(off + ddf_off));
goto found;
}
if (memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0) {
info("header adaptec (big endian) found at %llu\n", (unsigned long long)(off + ddf_off));
goto found;
}
return -1;
found:
volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
volume_id_set_usage(id, VOLUME_ID_RAID);
id->type = "ddf_raid_member";
return 0;
}
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