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118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2005-2007 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "util.h"
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#define MINIX_SUPERBLOCK_OFFSET 0x400
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#define MINIX_SUPER_MAGIC 0x137F
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#define MINIX_SUPER_MAGIC2 0x138F
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#define MINIX2_SUPER_MAGIC 0x2468
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#define MINIX2_SUPER_MAGIC2 0x2478
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#define MINIX3_SUPER_MAGIC 0x4d5a
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struct minix_super_block
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{
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uint16_t s_ninodes;
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uint16_t s_nzones;
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uint16_t s_imap_blocks;
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uint16_t s_zmap_blocks;
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uint16_t s_firstdatazone;
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uint16_t s_log_zone_size;
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uint32_t s_max_size;
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uint16_t s_magic;
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uint16_t s_state;
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uint32_t s_zones;
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} PACKED;
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struct minix3_super_block {
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uint32_t s_ninodes;
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uint16_t s_pad0;
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uint16_t s_imap_blocks;
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uint16_t s_zmap_blocks;
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uint16_t s_firstdatazone;
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uint16_t s_log_zone_size;
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uint16_t s_pad1;
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uint32_t s_max_size;
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uint32_t s_zones;
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uint16_t s_magic;
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uint16_t s_pad2;
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uint16_t s_blocksize;
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uint8_t s_disk_version;
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} PACKED;
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int volume_id_probe_minix(struct volume_id *id, uint64_t off, uint64_t size)
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{
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uint8_t *buf;
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struct minix_super_block *ms;
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struct minix3_super_block *m3s;
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info("probing at offset 0x%llx", (unsigned long long) off);
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buf = volume_id_get_buffer(id, off + MINIX_SUPERBLOCK_OFFSET, 0x200);
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if (buf == NULL)
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return -1;
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ms = (struct minix_super_block *) buf;
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if (ms->s_magic == MINIX_SUPER_MAGIC ||
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ms->s_magic == bswap_16(MINIX_SUPER_MAGIC)) {
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strcpy(id->type_version, "1");
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goto found;
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}
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if (ms->s_magic == MINIX_SUPER_MAGIC2 ||
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ms->s_magic == bswap_16(MINIX_SUPER_MAGIC2)) {
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strcpy(id->type_version, "1");
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goto found;
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}
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if (ms->s_magic == MINIX2_SUPER_MAGIC ||
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ms->s_magic == bswap_16(MINIX2_SUPER_MAGIC)) {
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strcpy(id->type_version, "2");
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goto found;
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}
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if (ms->s_magic == MINIX2_SUPER_MAGIC2 ||
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ms->s_magic == bswap_16(MINIX2_SUPER_MAGIC2)) {
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strcpy(id->type_version, "2");
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goto found;
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}
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m3s = (struct minix3_super_block *) buf;
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if (m3s->s_magic == MINIX3_SUPER_MAGIC ||
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m3s->s_magic == bswap_16(MINIX3_SUPER_MAGIC)) {
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strcpy(id->type_version, "3");
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goto found;
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}
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goto exit;
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found:
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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id->type = "minix";
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return 0;
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exit:
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return -1;
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}
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