Logo Search packages:      
Sourcecode: udev version File versions

mac.c

/*
 * volume_id - reads filesystem label and uuid
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#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 <asm/types.h>

#include "volume_id.h"
#include "logging.h"
#include "util.h"
#include "mac.h"

struct mac_driver_desc {
      __u8  signature[2];
      __u16 block_size;
      __u32 block_count;
} __attribute__((__packed__));

struct mac_partition {
      __u8  signature[2];
      __u16 res1;
      __u32 map_count;
      __u32 start_block;
      __u32 block_count;
      __u8  name[32];
      __u8  type[32];
} __attribute__((__packed__));

int volume_id_probe_mac_partition_map(struct volume_id *id, __u64 off)
{
      const __u8 *buf;
      struct mac_driver_desc *driver;
      struct mac_partition *part;

      dbg("probing at offset 0x%llx", (unsigned long long) off);

      buf = volume_id_get_buffer(id, off, 0x200);
      if (buf == NULL)
            return -1;

      part = (struct mac_partition *) buf;
      if ((memcmp(part->signature, "PM", 2) == 0) &&
          (memcmp(part->type, "Apple_partition_map", 19) == 0)) {
            /* linux creates an own subdevice for the map
             * just return the type if the drive header is missing */
            volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
            id->type = "mac_partition_map";
            return 0;
      }

      driver = (struct mac_driver_desc *) buf;
      if (memcmp(driver->signature, "ER", 2) == 0) {
            /* we are on a main device, like a CD
             * just try to probe the first partition from the map */
            unsigned int bsize = be16_to_cpu(driver->block_size);
            int part_count;
            int i;

            /* get first entry of partition table */
            buf = volume_id_get_buffer(id, off +  bsize, 0x200);
            if (buf == NULL)
                  return -1;

            part = (struct mac_partition *) buf;
            if (memcmp(part->signature, "PM", 2) != 0)
                  return -1;

            part_count = be32_to_cpu(part->map_count);
            dbg("expecting %d partition entries", part_count);

            if (id->partitions != NULL)
                  free(id->partitions);
            id->partitions =
                  malloc(part_count * sizeof(struct volume_id_partition));
            if (id->partitions == NULL)
                  return -1;
            memset(id->partitions, 0x00, sizeof(struct volume_id_partition));

            id->partition_count = part_count;

            for (i = 0; i < part_count; i++) {
                  __u64 poff;
                  __u64 plen;

                  buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
                  if (buf == NULL)
                        return -1;

                  part = (struct mac_partition *) buf;
                  if (memcmp(part->signature, "PM", 2) != 0)
                        return -1;

                  poff = be32_to_cpu(part->start_block) * bsize;
                  plen = be32_to_cpu(part->block_count) * bsize;
                  dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
                      part->type, (unsigned long long) poff, (unsigned long long) plen);

                  id->partitions[i].off = poff;
                  id->partitions[i].len = plen;

                  if (memcmp(part->type, "Apple_Free", 10) == 0) {
                        volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
                  } else if (memcmp(part->type, "Apple_partition_map", 19) == 0) {
                        volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
                  } else {
                        volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
                  }
            }
            volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
            id->type = "mac_partition_map";
            return 0;
      }

      return -1;
}

Generated by  Doxygen 1.6.0   Back to index