minix.c revision 2603474ff9be2418900581da1af5cccc9f13cae1
/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2005-2007 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 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 "libvolume_id-private.h"
#include "util.h"
#define MINIX_SUPERBLOCK_OFFSET 0x400
#define MINIX_SUPER_MAGIC 0x137F
#define MINIX_SUPER_MAGIC2 0x138F
#define MINIX2_SUPER_MAGIC 0x2468
#define MINIX2_SUPER_MAGIC2 0x2478
#define MINIX3_SUPER_MAGIC 0x4d5a
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;
struct minix3_super_block {
uint32_t s_ninodes;
uint16_t s_pad0;
uint16_t s_imap_blocks;
uint16_t s_zmap_blocks;
uint16_t s_firstdatazone;
uint16_t s_log_zone_size;
uint16_t s_pad1;
uint32_t s_max_size;
uint32_t s_zones;
uint16_t s_magic;
uint16_t s_pad2;
uint16_t s_blocksize;
uint8_t s_disk_version;
} PACKED;
int volume_id_probe_minix(struct volume_id *id, uint64_t off, uint64_t size)
{
uint8_t *buf;
struct minix_super_block *ms;
struct minix3_super_block *m3s;
info("probing at offset 0x%llx\n", (unsigned long long) off);
buf = volume_id_get_buffer(id, off + MINIX_SUPERBLOCK_OFFSET, 0x200);
if (buf == NULL)
return -1;
ms = (struct minix_super_block *) buf;
if (ms->s_magic == MINIX_SUPER_MAGIC ||
ms->s_magic == bswap_16(MINIX_SUPER_MAGIC)) {
strcpy(id->type_version, "1");
goto found;
}
if (ms->s_magic == MINIX_SUPER_MAGIC2 ||
ms->s_magic == bswap_16(MINIX_SUPER_MAGIC2)) {
strcpy(id->type_version, "1");
goto found;
}
if (ms->s_magic == MINIX2_SUPER_MAGIC ||
ms->s_magic == bswap_16(MINIX2_SUPER_MAGIC)) {
strcpy(id->type_version, "2");
goto found;
}
if (ms->s_magic == MINIX2_SUPER_MAGIC2 ||
ms->s_magic == bswap_16(MINIX2_SUPER_MAGIC2)) {
strcpy(id->type_version, "2");
goto found;
}
m3s = (struct minix3_super_block *) buf;
if (m3s->s_magic == MINIX3_SUPER_MAGIC ||
m3s->s_magic == bswap_16(MINIX3_SUPER_MAGIC)) {
strcpy(id->type_version, "3");
goto found;
}
goto exit;
found:
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
id->type = "minix";
return 0;
exit:
return -1;
}