/*
 * volume_id - reads filesystem label and uuid
 *
 * Copyright (C) 2004 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 jfs_super_block {
	uint8_t		magic[4];
	uint32_t	version;
	uint64_t	size;
	uint32_t	bsize;
	uint32_t	dummy1;
	uint32_t	pbsize;
	uint32_t	dummy2[27];
	uint8_t		uuid[16];
	uint8_t		label[16];
	uint8_t		loguuid[16];
} PACKED;

#define JFS_SUPERBLOCK_OFFSET			0x8000

int volume_id_probe_jfs(struct volume_id *id, uint64_t off, uint64_t size)
{
	struct jfs_super_block *js;

	info("probing at offset 0x%llx\n", (unsigned long long) off);

	js = (struct jfs_super_block *) volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
	if (js == NULL)
		return -1;

	if (memcmp(js->magic, "JFS1", 4) != 0)
		return -1;

	volume_id_set_label_raw(id, js->label, 16);
	volume_id_set_label_string(id, js->label, 16);
	volume_id_set_uuid(id, js->uuid, 0, UUID_DCE);

	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
	id->type = "jfs";

	return 0;
}