systemd-stable/extras/volume_id/lib/nvidia_raid.c

/*
 * volume_id - reads filesystem label and uuid
 *
 * Copyright (C) 2005 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 "libvolume_id.h"
#include "libvolume_id-private.h"

struct nvidia_meta {
	uint8_t		vendor[8];
	uint32_t	size;
	uint32_t	chksum;
	uint16_t	version;
} PACKED;

#define NVIDIA_SIGNATURE		"NVIDIA"

int volume_id_probe_nvidia_raid(struct volume_id *id, uint64_t off, uint64_t size)
{
	const uint8_t *buf;
	uint64_t meta_off;
	struct nvidia_meta *nv;

	info("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)-2) * 0x200;
	buf = volume_id_get_buffer(id, off + meta_off, 0x200);
	if (buf == NULL)
		return -1;

	nv = (struct nvidia_meta *) buf;
	if (memcmp(nv->vendor, NVIDIA_SIGNATURE, sizeof(NVIDIA_SIGNATURE)-1) != 0)
		return -1;

	volume_id_set_usage(id, VOLUME_ID_RAID);
	snprintf(id->type_version, sizeof(id->type_version)-1, "%u", le16_to_cpu(nv->version));
	id->type = "nvidia_raid_member";

	return 0;
}