/*

 * Copyright (C) 2016 Micron Technology, Inc.

 *

 * This file may be redistributed under the terms of the

 * GNU Lesser General Public License.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <stdint.h>

#include "crc32c.h"

#include "superblocks.h"

#define MAX_MPOOL_NAME_LEN 32

struct omf_sb_descriptor {

  uint64_t        osb_magic;

  uint8_t         osb_name[MAX_MPOOL_NAME_LEN];

  unsigned char   osb_poolid[16]; /* UUID of pool this drive belongs to */

  uint16_t        osb_vers;

  uint32_t        osb_gen;

  uint32_t        osb_cksum1; /* crc32c of the preceding fields */

} __attribute__((packed));

static int probe_mpool(blkid_probe pr, const struct blkid_idmag *mag)

{

  const struct omf_sb_descriptor *osd;

  uint32_t sb_crc;

  osd = blkid_probe_get_sb(pr, mag, struct omf_sb_descriptor);

  if (!osd)

    return errno ? -errno : 1;

  sb_crc = crc32c(~0L, (const void *)osd,

      offsetof(struct omf_sb_descriptor, osb_cksum1));

  sb_crc ^= ~0L;

  if (!blkid_probe_verify_csum(pr, sb_crc, le32_to_cpu(osd->osb_cksum1)))

    return 1;

  blkid_probe_set_label(pr, osd->osb_name, sizeof(osd->osb_name));

  blkid_probe_set_uuid(pr, osd->osb_poolid);

  return 0;

}

/* "mpoolDev" in ASCII */

#define MPOOL_SB_MAGIC "\x6D\x70\x6f\x6f\x6c\x44\x65\x76"

const struct blkid_idinfo mpool_idinfo =

{

  .name   = "mpool",

  .usage    = BLKID_USAGE_FILESYSTEM,

  .probefunc  = probe_mpool,

  .magics   =

  {

    { .magic = MPOOL_SB_MAGIC, .len = 8},

    { NULL }

  }

};