/*

 * ioctl based topology -- gathers topology information

 *

 * Copyright (C) 2009 Karel Zak <kzak@redhat.com>

 *

 * This file may be redistributed under the terms of the

 * GNU Lesser General Public License.

 *

 */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <stdint.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <errno.h>

#include "topology.h"

/*

 * ioctl topology values

 */

static const struct topology_val {

  long  ioc;

  /* functions to set probing result */

  int (*set_ulong)(blkid_probe, unsigned long);

  int (*set_int)(blkid_probe, int);

  int (*set_u64)(blkid_probe, uint64_t);

} topology_vals[] = {

  { BLKALIGNOFF, NULL, blkid_topology_set_alignment_offset },

  { BLKIOMIN, blkid_topology_set_minimum_io_size },

  { BLKIOOPT, blkid_topology_set_optimal_io_size },

  { BLKPBSZGET, blkid_topology_set_physical_sector_size },

  { BLKGETDISKSEQ, .set_u64 = blkid_topology_set_diskseq },

  /* we read BLKSSZGET in topology.c */

};

static int probe_ioctl_tp(blkid_probe pr,

    const struct blkid_idmag *mag __attribute__((__unused__)))

{

  size_t i;

  for (i = 0; i < ARRAY_SIZE(topology_vals); i++) {

    const struct topology_val *val = &topology_vals[i];

    int rc = 1;

    union {

      unsigned long ul;

      int i;

      uint64_t u64;

    } data;

    if (ioctl(pr->fd, val->ioc, &data) == -1)

      goto nothing;

    if (val->set_int)

      rc = val->set_int(pr, data.i);

    else if (val->set_ulong)

      rc = val->set_ulong(pr, data.ul);

    else

      rc = val->set_u64(pr, data.u64);

    if (rc)

      goto err;

  }

  return 0;

nothing:

  return 1;

err:

  return -1;

}

const struct blkid_idinfo ioctl_tp_idinfo =

{

  .name   = "ioctl",

  .probefunc  = probe_ioctl_tp,

  .magics   = BLKID_NONE_MAGIC

};