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/*
* sysfs based topology -- gathers topology information from Linux sysfs
*
* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*
* For more information see Linux kernel Documentation/ABI/testing/sysfs-block.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "topology.h"
/*
* Sysfs topology values (since 2.6.31, May 2009).
*/
static struct topology_val {
/* /sys/dev/block/<maj>:<min>/<ATTR> */
const char *attr;
/* functions to set probing resut */
int (*set_ulong)(blkid_probe, unsigned long);
int (*set_int)(blkid_probe, int);
} topology_vals[] = {
{ "alignment_offset", NULL, blkid_topology_set_alignment_offset },
{ "queue/minimum_io_size", blkid_topology_set_minimum_io_size },
{ "queue/optimal_io_size", blkid_topology_set_optimal_io_size },
{ "queue/physical_block_size", blkid_topology_set_physical_sector_size },
};
static int probe_sysfs_tp(blkid_probe pr, const struct blkid_idmag *mag)
{
dev_t dev, pri_dev = 0;
int i, count = 0;
dev = blkid_probe_get_devno(pr);
if (!dev)
goto nothing; /* probably not a block device */
for (i = 0; i < ARRAY_SIZE(topology_vals); i++) {
struct topology_val *val = &topology_vals[i];
dev_t attr_dev = dev;
int rc = 1;
if (!blkid_devno_has_attribute(dev, val->attr)) {
/* get attribute from partition's primary device */
if (!pri_dev &&
blkid_devno_to_wholedisk(dev, NULL, 0, &pri_dev))
continue;
attr_dev = pri_dev;
}
if (val->set_ulong) {
uint64_t data = 0;
if (blkid_devno_get_u64_attribute(attr_dev,
val->attr, &data))
continue;
rc = val->set_ulong(pr, (unsigned long) data);
} else if (val->set_int) {
int64_t data = 0;
if (blkid_devno_get_s64_attribute(attr_dev,
val->attr, &data))
continue;
rc = val->set_int(pr, (int) data);
}
if (rc)
goto err;
count++;
}
if (count)
return 0;
nothing:
return 1;
err:
return -1;
}
const struct blkid_idinfo sysfs_tp_idinfo =
{
.name = "sysfs",
.probefunc = probe_sysfs_tp,
.magics = BLKID_NONE_MAGIC
};
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