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
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef _GNU_SOURCE
  21 #define _GNU_SOURCE 1
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <ctype.h>
  30 #include <byteswap.h>
  31
  32 #include "libvolume_id.h"
  33 #include "libvolume_id-private.h"
  34
  35 /* http://www.snia.org/standards/home */
  36
  37 #define DDF_GUID_LENGTH                 24
  38 #define DDF_REV_LENGTH                  8
  39
  40 struct ddf_header {
  41         uint8_t         signature[4];
  42         uint32_t        crc;
  43         uint8_t         guid[DDF_GUID_LENGTH];
  44         uint8_t         ddf_rev[DDF_REV_LENGTH];
  45 } PACKED;
  46
  47 int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
  48 {
  49         uint64_t ddf_off;
  50         const uint8_t *buf;
  51         struct ddf_header *ddf;
  52
  53         info("probing at offset 0x%llx, size 0x%llx\n",
  54              (unsigned long long)off, (unsigned long long)size);
  55         if (size < 0x30000)
  56                 return -1;
  57
  58         /* header at last sector */
  59         ddf_off = ((size / 0x200)-1) * 0x200;
  60         buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
  61         if (buf == NULL)
  62                 return -1;
  63         ddf = (struct ddf_header *) buf;
  64         if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0) {
  65                 info("header (little endian) found at %llu\n", (unsigned long long)(off + ddf_off));
  66                 goto found;
  67         }
  68         if (memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0) {
  69                 info("header (big endian) found at %llu\n", (unsigned long long)(off + ddf_off));
  70                 goto found;
  71         }
  72
  73         /* adaptec non-standard header location */
  74         ddf_off = ((size / 0x200)-257) * 0x200;
  75         buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
  76         if (buf == NULL)
  77                 return -1;
  78         ddf = (struct ddf_header *) buf;
  79         if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0) {
  80                 info("header adaptec (little endian) found at %llu\n", (unsigned long long)(off + ddf_off));
  81                 goto found;
  82         }
  83         if (memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0) {
  84                 info("header adaptec (big endian) found at %llu\n", (unsigned long long)(off + ddf_off));
  85                 goto found;
  86         }
  87
  88         return -1;
  89 found:
  90         volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
  91         snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
  92         volume_id_set_usage(id, VOLUME_ID_RAID);
  93         id->type = "ddf_raid_member";
  94         return 0;
  95 }