extras/volume_id/volume_id/mac/mac.c

   1 /*
   2  * volume_id - reads filesystem label and uuid
   3  *
   4  * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This library is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU Lesser General Public
   8  *      License as published by the Free Software Foundation; either
   9  *      version 2.1 of the License, or (at your option) any later version.
  10  *
  11  *      This library is distributed in the hope that it will be useful,
  12  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  *      Lesser General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU Lesser General Public
  17  *      License along with this library; if not, write to the Free Software
  18  *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #ifndef _GNU_SOURCE
  22 #define _GNU_SOURCE 1
  23 #endif
  24
  25 #ifdef HAVE_CONFIG_H
  26 #  include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <errno.h>
  34 #include <ctype.h>
  35 #include <asm/types.h>
  36
  37 #include "../volume_id.h"
  38 #include "../logging.h"
  39 #include "../util.h"
  40 #include "mac.h"
  41
  42 int volume_id_probe_mac_partition_map(struct volume_id *id, __u64 off)
  43 {
  44         struct mac_driver_desc {
  45                 __u8    signature[2];
  46                 __u16   block_size;
  47                 __u32   block_count;
  48         } __attribute__((__packed__)) *driver;
  49
  50         struct mac_partition {
  51                 __u8    signature[2];
  52                 __u16   res1;
  53                 __u32   map_count;
  54                 __u32   start_block;
  55                 __u32   block_count;
  56                 __u8    name[32];
  57                 __u8    type[32];
  58         } __attribute__((__packed__)) *part;
  59
  60         const __u8 *buf;
  61
  62         buf = volume_id_get_buffer(id, off, 0x200);
  63         if (buf == NULL)
  64                 return -1;
  65
  66         part = (struct mac_partition *) buf;
  67         if ((strncmp(part->signature, "PM", 2) == 0) &&
  68             (strncmp(part->type, "Apple_partition_map", 19) == 0)) {
  69                 /* linux creates an own subdevice for the map
  70                  * just return the type if the drive header is missing */
  71                 volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
  72                 id->type = "mac_partition_map";
  73                 return 0;
  74         }
  75
  76         driver = (struct mac_driver_desc *) buf;
  77         if (strncmp(driver->signature, "ER", 2) == 0) {
  78                 /* we are on a main device, like a CD
  79                  * just try to probe the first partition from the map */
  80                 unsigned int bsize = be16_to_cpu(driver->block_size);
  81                 int part_count;
  82                 int i;
  83
  84                 /* get first entry of partition table */
  85                 buf = volume_id_get_buffer(id, off +  bsize, 0x200);
  86                 if (buf == NULL)
  87                         return -1;
  88
  89                 part = (struct mac_partition *) buf;
  90                 if (strncmp(part->signature, "PM", 2) != 0)
  91                         return -1;
  92
  93                 part_count = be32_to_cpu(part->map_count);
  94                 dbg("expecting %d partition entries", part_count);
  95
  96                 if (id->partitions != NULL)
  97                         free(id->partitions);
  98                 id->partitions =
  99                         malloc(part_count * sizeof(struct volume_id_partition));
 100                 if (id->partitions == NULL)
 101                         return -1;
 102                 memset(id->partitions, 0x00, sizeof(struct volume_id_partition));
 103
 104                 id->partition_count = part_count;
 105
 106                 for (i = 0; i < part_count; i++) {
 107                         __u64 poff;
 108                         __u64 plen;
 109
 110                         buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
 111                         if (buf == NULL)
 112                                 return -1;
 113
 114                         part = (struct mac_partition *) buf;
 115                         if (strncmp(part->signature, "PM", 2) != 0)
 116                                 return -1;
 117
 118                         poff = be32_to_cpu(part->start_block) * bsize;
 119                         plen = be32_to_cpu(part->block_count) * bsize;
 120                         dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
 121                             part->type, poff, plen);
 122
 123                         id->partitions[i].off = poff;
 124                         id->partitions[i].len = plen;
 125
 126                         if (strncmp(part->type, "Apple_Free", 10) == 0) {
 127                                 volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
 128                         } else if (strncmp(part->type, "Apple_partition_map", 19) == 0) {
 129                                 volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
 130                         } else {
 131                                 volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
 132                         }
 133                 }
 134                 volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
 135                 id->type = "mac_partition_map";
 136                 return 0;
 137         }
 138
 139         return -1;
 140 }