minix.c revision b5e694267142042228a6cac99ecad6c4b4ef8759
/*
* 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 version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "libvolume_id.h"
#include "util.h"
struct minix_super_block
{
uint16_t s_ninodes;
uint16_t s_nzones;
uint16_t s_imap_blocks;
uint16_t s_zmap_blocks;
uint16_t s_firstdatazone;
uint16_t s_log_zone_size;
uint32_t s_max_size;
uint16_t s_magic;
uint16_t s_state;
uint32_t s_zones;
} PACKED;
#define MINIX_SUPERBLOCK_OFFSET 0x400
int volume_id_probe_minix(struct volume_id *id, uint64_t off)
{
struct minix_super_block *ms;
dbg("probing at offset 0x%llx", (unsigned long long) off);
ms = (struct minix_super_block *) volume_id_get_buffer(id, off + MINIX_SUPERBLOCK_OFFSET, 0x200);
if (ms == NULL)
return -1;
if (le16_to_cpu(ms->s_magic) == 0x137f) {
strcpy(id->type_version, "1");
goto found;
}
if (le16_to_cpu(ms->s_magic) == 0x1387) {
strcpy(id->type_version, "1");
goto found;
}
if (le16_to_cpu(ms->s_magic) == 0x2468) {
strcpy(id->type_version, "2");
goto found;
}
if (le16_to_cpu(ms->s_magic) == 0x2478) {
strcpy(id->type_version, "2");
goto found;
}
goto exit;
found:
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
id->type = "minix";
return 0;
exit:
return -1;
}