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/*
* 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 "blkdev.h" /* top-level lib/ */
#include "topology.h"
/*
* ioctl topology values
*/
static struct topology_val {
long ioc;
/* function to set probing resut */
int (*set_result)(blkid_probe, unsigned long);
} topology_vals[] = {
{ BLKALIGNOFF, blkid_topology_set_alignment_offset },
{ BLKIOMIN, blkid_topology_set_minimum_io_size },
{ BLKIOOPT, blkid_topology_set_optimal_io_size },
};
static int probe_ioctl_tp(blkid_probe pr, const struct blkid_idmag *mag)
{
int i;
int count = 0;
for (i = 0; i < ARRAY_SIZE(topology_vals); i++) {
struct topology_val *val = &topology_vals[i];
unsigned int data;
int rc;
if (ioctl(pr->fd, val->ioc, &data) == -1)
goto nothing;
rc = val->set_result(pr, (unsigned long) data);
if (rc)
goto err;
count++;
}
if (count)
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
};
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