libblkid/src/superblocks/bluestore.c

   1 /*
   2  * Copyright (C) 2018 by Kenneth Van Alstyne <kvanals@kvanals.org>
   3  *
   4  * This file may be redistributed under the terms of the
   5  * GNU Lesser General Public License.
   6  *
   7  *
   8  * Ceph BlueStore is one of the supported storage
   9  * methods for Object Storage Devices (OSDs).
  10  * This is used to detect the backing block devices
  11  * used for these types of OSDs in a Ceph Cluster.
  12  *
  13  */
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <string.h>
  18 #include <errno.h>
  19 #include <ctype.h>
  20 #include <inttypes.h>
  21 #include <stddef.h>
  22
  23 #include "bitops.h"
  24 #include "superblocks.h"
  25
  26 #define BLUESTORE_MAGIC_L               22
  27
  28 struct bluestore_phdr {
  29         uint8_t         magic[BLUESTORE_MAGIC_L];
  30 } __attribute__((packed));
  31
  32 static int probe_bluestore(blkid_probe pr, const struct blkid_idmag *mag)
  33 {
  34         struct bluestore_phdr *header;
  35
  36         header = blkid_probe_get_sb(pr, mag, struct bluestore_phdr);
  37         if (header == NULL)
  38                 return errno ? -errno : 1;
  39
  40         return 0;
  41 }
  42
  43 const struct blkid_idinfo bluestore_idinfo =
  44 {
  45         .name           = "ceph_bluestore",
  46         .usage          = BLKID_USAGE_OTHER,
  47         .probefunc      = probe_bluestore,
  48         .magics         =
  49         {
  50                 { .magic = "bluestore block device", .len = 22 },
  51                 { NULL }
  52         }
  53 };