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Viewing changes to libblkid/src/topology/ioctl.c

  • Committer: Package Import Robot
  • Author(s): LaMont Jones
  • Date: 2011-11-03 15:38:23 UTC
  • mto: (4.5.5 sid) (1.6.4)
  • mto: This revision was merged to the branch mainline in revision 85.
  • Revision ID: package-import@ubuntu.com-20111103153823-10sx16jprzxlhkqf
Import upstream version 2.20.1

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libblkid/src/topology/ioctl.c
 
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/*
 
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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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