75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/*
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* ioctl based topology -- gathers topology information
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*
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* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include "topology.h"
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/*
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* ioctl topology values
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*/
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static struct topology_val {
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long ioc;
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/* functions to set probing result */
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int (*set_ulong)(blkid_probe, unsigned long);
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int (*set_int)(blkid_probe, int);
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} topology_vals[] = {
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{ BLKALIGNOFF, NULL, blkid_topology_set_alignment_offset },
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{ BLKIOMIN, blkid_topology_set_minimum_io_size },
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{ BLKIOOPT, blkid_topology_set_optimal_io_size },
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{ BLKPBSZGET, blkid_topology_set_physical_sector_size }
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/* we read BLKSSZGET in topology.c */
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};
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static int probe_ioctl_tp(blkid_probe pr,
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const struct blkid_idmag *mag __attribute__((__unused__)))
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{
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size_t i;
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for (i = 0; i < ARRAY_SIZE(topology_vals); i++) {
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struct topology_val *val = &topology_vals[i];
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int rc = 1;
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unsigned int data;
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if (ioctl(pr->fd, val->ioc, &data) == -1)
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goto nothing;
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if (val->set_int)
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rc = val->set_int(pr, (int) data);
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else
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rc = val->set_ulong(pr, (unsigned long) data);
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if (rc)
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goto err;
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}
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return 0;
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nothing:
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return 1;
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err:
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return -1;
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}
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const struct blkid_idinfo ioctl_tp_idinfo =
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{
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.name = "ioctl",
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.probefunc = probe_ioctl_tp,
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.magics = BLKID_NONE_MAGIC
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};
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