shlibs/blkid/src/probers/ddf_raid.c

   1 /*
   2  * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
   3  *
   4  * Inspired by libvolume_id by
   5  *     Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  * This file may be redistributed under the terms of the
   8  * GNU Lesser General Public License.
   9  */
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <stdint.h>
  15
  16 #include "blkidP.h"
  17
  18 /* http://www.snia.org/standards/home */
  19 #define DDF_GUID_LENGTH                 24
  20 #define DDF_REV_LENGTH                  8
  21
  22 struct ddf_header {
  23         uint8_t         signature[4];
  24         uint32_t        crc;
  25         uint8_t         guid[DDF_GUID_LENGTH];
  26         uint8_t         ddf_rev[DDF_REV_LENGTH];
  27 } __attribute__((packed));
  28
  29 static int probe_ddf(blkid_probe pr, const struct blkid_idmag *mag)
  30 {
  31         int hdrs[] = { 1, 257 };
  32         int i;
  33         struct ddf_header *ddf = NULL;
  34         char version[DDF_REV_LENGTH + 1];
  35
  36         if (pr->size < 0x30000)
  37                 return -1;
  38
  39         for (i = 0; i < ARRAY_SIZE(hdrs); i++) {
  40                 uint64_t off = ((pr->size / 0x200) - hdrs[i]) * 0x200;
  41
  42                 ddf = (struct ddf_header *) blkid_probe_get_buffer(pr,
  43                                         off,
  44                                         sizeof(struct ddf_header));
  45                 if (!ddf)
  46                         return -1;
  47
  48                 if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0 ||
  49                     memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0)
  50                         break;
  51                 ddf = NULL;
  52         }
  53
  54         if (!ddf)
  55                 return -1;
  56
  57         blkid_probe_strncpy_uuid(pr, ddf->guid, sizeof(ddf->guid));
  58
  59         memcpy(version, ddf->ddf_rev, sizeof(ddf->ddf_rev));
  60         *(version + sizeof(ddf->ddf_rev)) = '\0';
  61
  62         if (blkid_probe_set_version(pr, version) != 0)
  63                 return -1;
  64         return 0;
  65 }
  66
  67 const struct blkid_idinfo ddfraid_idinfo = {
  68         .name           = "ddf_raid_member",
  69         .usage          = BLKID_USAGE_RAID,
  70         .probefunc      = probe_ddf,
  71         .magics         = BLKID_NONE_MAGIC
  72 };
  73
  74