LXR busybox/util-linux/volume_id/unused

   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//config:### config FEATURE_VOLUMEID_MAC
  21//config:###    bool "mac filesystem"
  22//config:###    default y
  23//config:###    depends on VOLUMEID
  24
  25//kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_MAC) += mac.o
  26
  27#include "volume_id_internal.h"
  28
  29struct mac_driver_desc {
  30        uint8_t         signature[2];
  31        uint16_t        block_size;
  32        uint32_t        block_count;
  33} PACKED;
  34
  35struct mac_partition {
  36        uint8_t         signature[2];
  37        uint16_t        res1;
  38        uint32_t        map_count;
  39        uint32_t        start_block;
  40        uint32_t        block_count;
  41        uint8_t         name[32];
  42        uint8_t         type[32];
  43} PACKED;
  44
  45int FAST_FUNC volume_id_probe_mac_partition_map(struct volume_id *id, uint64_t off)
  46{
  47        const uint8_t *buf;
  48        struct mac_driver_desc *driver;
  49        struct mac_partition *part;
  50
  51        dbg("probing at offset 0x%llx", (unsigned long long) off);
  52
  53        buf = volume_id_get_buffer(id, off, 0x200);
  54        if (buf == NULL)
  55                return -1;
  56
  57        part = (struct mac_partition *) buf;
  58        if (part->signature[0] == 'P' && part->signature[1] == 'M' /* "PM" */
  59         && (memcmp(part->type, "Apple_partition_map", 19) == 0)
  60        ) {
  61                /* linux creates an own subdevice for the map
  62                 * just return the type if the drive header is missing */
  63//              volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
  64//              id->type = "mac_partition_map";
  65                return 0;
  66        }
  67
  68        driver = (struct mac_driver_desc *) buf;
  69        if (driver->signature[0] == 'E' && driver->signature[1] == 'R') { /* "ER" */
  70                /* we are on a main device, like a CD
  71                 * just try to probe the first partition from the map */
  72                unsigned bsize = be16_to_cpu(driver->block_size);
  73                int part_count;
  74                int i;
  75
  76                /* get first entry of partition table */
  77                buf = volume_id_get_buffer(id, off +  bsize, 0x200);
  78                if (buf == NULL)
  79                        return -1;
  80
  81                part = (struct mac_partition *) buf;
  82                if (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
  83                        return -1;
  84
  85                part_count = be32_to_cpu(part->map_count);
  86                dbg("expecting %d partition entries", part_count);
  87
  88                if (id->partitions != NULL)
  89                        free(id->partitions);
  90                id->partitions = xzalloc(part_count * sizeof(struct volume_id_partition));
  91
  92                id->partition_count = part_count;
  93
  94                for (i = 0; i < part_count; i++) {
  95                        uint64_t poff;
  96                        uint64_t plen;
  97
  98                        buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
  99                        if (buf == NULL)
 100                                return -1;
 101
 102                        part = (struct mac_partition *) buf;
 103                        if (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
 104                                return -1;
 105
 106                        poff = be32_to_cpu(part->start_block) * bsize;
 107                        plen = be32_to_cpu(part->block_count) * bsize;
 108                        dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
 109                                        part->type, (unsigned long long) poff,
 110                                        (unsigned long long) plen);
 111
 112//                      id->partitions[i].pt_off = poff;
 113//                      id->partitions[i].pt_len = plen;
 114
 115//                      if (memcmp(part->type, "Apple_Free", 10) == 0) {
 116//                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
 117//                      } else if (memcmp(part->type, "Apple_partition_map", 19) == 0) {
 118//                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
 119//                      } else {
 120//                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
 121//                      }
 122                }
 123//              volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
 124//              id->type = "mac_partition_map";
 125                return 0;
 126        }
 127
 128        return -1;
 129}
 130