1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) 2005-2007 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 29#define MINIX_SUPERBLOCK_OFFSET 0x400 30 31#define MINIX_SUPER_MAGIC 0x137F 32#define MINIX_SUPER_MAGIC2 0x138F 33#define MINIX2_SUPER_MAGIC 0x2468 34#define MINIX2_SUPER_MAGIC2 0x2478 35#define MINIX3_SUPER_MAGIC 0x4d5a 36 37struct minix_super_block 38{ 39 uint16_t s_ninodes; 40 uint16_t s_nzones; 41 uint16_t s_imap_blocks; 42 uint16_t s_zmap_blocks; 43 uint16_t s_firstdatazone; 44 uint16_t s_log_zone_size; 45 uint32_t s_max_size; 46 uint16_t s_magic; 47 uint16_t s_state; 48 uint32_t s_zones; 49} PACKED; 50 51struct minix3_super_block { 52 uint32_t s_ninodes; 53 uint16_t s_pad0; 54 uint16_t s_imap_blocks; 55 uint16_t s_zmap_blocks; 56 uint16_t s_firstdatazone; 57 uint16_t s_log_zone_size; 58 uint16_t s_pad1; 59 uint32_t s_max_size; 60 uint32_t s_zones; 61 uint16_t s_magic; 62 uint16_t s_pad2; 63 uint16_t s_blocksize; 64 uint8_t s_disk_version; 65} PACKED; 66 67int volume_id_probe_minix(struct volume_id *id, uint64_t off, uint64_t size) 68{ 69 uint8_t *buf; 70 struct minix_super_block *ms; 71 struct minix3_super_block *m3s; 72 73 info("probing at offset 0x%llx", (unsigned long long) off); 74 75 buf = volume_id_get_buffer(id, off + MINIX_SUPERBLOCK_OFFSET, 0x200); 76 if (buf == NULL) 77 return -1; 78 79 ms = (struct minix_super_block *) buf; 80 81 if (ms->s_magic == MINIX_SUPER_MAGIC || 82 ms->s_magic == bswap_16(MINIX_SUPER_MAGIC)) { 83 strcpy(id->type_version, "1"); 84 goto found; 85 } 86 if (ms->s_magic == MINIX_SUPER_MAGIC2 || 87 ms->s_magic == bswap_16(MINIX_SUPER_MAGIC2)) { 88 strcpy(id->type_version, "1"); 89 goto found; 90 } 91 if (ms->s_magic == MINIX2_SUPER_MAGIC || 92 ms->s_magic == bswap_16(MINIX2_SUPER_MAGIC)) { 93 strcpy(id->type_version, "2"); 94 goto found; 95 } 96 if (ms->s_magic == MINIX2_SUPER_MAGIC2 || 97 ms->s_magic == bswap_16(MINIX2_SUPER_MAGIC2)) { 98 strcpy(id->type_version, "2"); 99 goto found; 100 } 101 102 m3s = (struct minix3_super_block *) buf; 103 if (m3s->s_magic == MINIX3_SUPER_MAGIC || 104 m3s->s_magic == bswap_16(MINIX3_SUPER_MAGIC)) { 105 strcpy(id->type_version, "3"); 106 goto found; 107 } 108 goto exit; 109 110found: 111 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); 112 id->type = "minix"; 113 return 0; 114 115exit: 116 return -1; 117} 118