1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 *	This program is free software; you can redistribute it and/or modify it
7 *	under the terms of the GNU General Public License as published by the
8 *	Free Software Foundation version 2 of the License.
9 */
10
11#ifndef _GNU_SOURCE
12#define _GNU_SOURCE 1
13#endif
14
15#ifdef HAVE_CONFIG_H
16#  include <config.h>
17#endif
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <unistd.h>
22#include <string.h>
23#include <errno.h>
24#include <ctype.h>
25
26#include "libvolume_id.h"
27#include "util.h"
28
29struct jfs_super_block {
30	uint8_t		magic[4];
31	uint32_t	version;
32	uint64_t	size;
33	uint32_t	bsize;
34	uint32_t	dummy1;
35	uint32_t	pbsize;
36	uint32_t	dummy2[27];
37	uint8_t		uuid[16];
38	uint8_t		label[16];
39	uint8_t		loguuid[16];
40} PACKED;
41
42#define JFS_SUPERBLOCK_OFFSET			0x8000
43
44int volume_id_probe_jfs(struct volume_id *id, uint64_t off, uint64_t size)
45{
46	struct jfs_super_block *js;
47
48	info("probing at offset 0x%llx", (unsigned long long) off);
49
50	js = (struct jfs_super_block *) volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
51	if (js == NULL)
52		return -1;
53
54	if (memcmp(js->magic, "JFS1", 4) != 0)
55		return -1;
56
57	volume_id_set_label_raw(id, js->label, 16);
58	volume_id_set_label_string(id, js->label, 16);
59	volume_id_set_uuid(id, js->uuid, 0, UUID_DCE);
60
61	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
62	id->type = "jfs";
63
64	return 0;
65}
66