shlibs/blkid/src/probers/jmicron_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
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <string.h>
  15 #include <stdint.h>
  16
  17 #include "blkidP.h"
  18
  19 struct jm_metadata {
  20         int8_t          signature[2];
  21         uint8_t         minor_version;
  22         uint8_t         major_version;
  23         uint16_t        checksum;
  24 };
  25
  26 #define JM_SIGNATURE            "JM"
  27
  28 static int probe_jmraid(blkid_probe pr, const struct blkid_idmag *mag)
  29 {
  30         uint64_t off;
  31         struct jm_metadata *jm;
  32
  33         if (pr->size < 0x10000)
  34                 return -1;
  35
  36         off = ((pr->size / 0x200) - 1) * 0x200;
  37         jm = (struct jm_metadata *)
  38                 blkid_probe_get_buffer(pr,
  39                                 off,
  40                                 sizeof(struct jm_metadata));
  41         if (!jm)
  42                 return -1;
  43         if (memcmp(jm->signature, JM_SIGNATURE, sizeof(JM_SIGNATURE) - 1) != 0)
  44                 return -1;
  45         if (blkid_probe_sprintf_version(pr, "%u.%u",
  46                                 jm->major_version, jm->minor_version) != 0)
  47                 return -1;
  48
  49         return 0;
  50 }
  51
  52 const struct blkid_idinfo jmraid_idinfo = {
  53         .name           = "jmicron_raid_member",
  54         .usage          = BLKID_USAGE_RAID,
  55         .probefunc      = probe_jmraid,
  56         .magics         = BLKID_NONE_MAGIC
  57 };
  58
  59