extras/volume_id/lib/ddf_raid.c

   1 /*
   2  * volume_id - reads filesystem label and uuid
   3  *
   4  * Copyright (C) 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 #include <byteswap.h>
  26
  27 #include "libvolume_id.h"
  28 #include "util.h"
  29
  30 /* http://www.snia.org/standards/home */
  31
  32 #define DDF_HEADER                      0xDE11DE11
  33 #define DDF_GUID_LENGTH                 24
  34 #define DDF_REV_LENGTH                  8
  35
  36 static struct ddf_header {
  37         uint32_t        signature;
  38         uint32_t        crc;
  39         uint8_t         guid[DDF_GUID_LENGTH];
  40         uint8_t         ddf_rev[DDF_REV_LENGTH];
  41 } PACKED *ddf;
  42
  43 int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
  44 {
  45         uint64_t ddf_off = ((size / 0x200)-1) * 0x200;
  46         const uint8_t *buf;
  47
  48         info("probing at offset 0x%llx, size 0x%llx\n",
  49             (unsigned long long) off, (unsigned long long) size);
  50         if (size < 0x10000)
  51                 return -1;
  52
  53         buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
  54         if (buf == NULL)
  55                 return -1;
  56         ddf = (struct ddf_header *) buf;
  57
  58         if (ddf->signature != cpu_to_be32(DDF_HEADER))
  59                 return -1;
  60
  61         volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
  62         snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
  63         volume_id_set_usage(id, VOLUME_ID_RAID);
  64         id->type = "ddf_raid_member";
  65         return 0;
  66 }