Attachment 95375 Details for Bug 103665 – program that does the boot-time-equivalent of rescan-scsi-bus.sh

program that does the boot-time-equivalent of rescan-scsi-bus.sh

rescan-scsi-bus.c (text/plain), 3.77 KB, created by Alexandre Oliva on 2003-10-22 03:03:57 UTC

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Creator: Alexandre Oliva

Created: 2003-10-22 03:03:57 UTC

Size: 3.77 KB

patch

obsolete

>/* This program issues add-single-device commands to /proc/scsi/scsi
>   for all SCSI hosts found in /proc/scsi/<driver>/<hostnumber>.
>
>   It can be used as a stand-alone binary, to be run in initrd, or
>   compiled into other programs (in compliance with the GNU GPL) that
>   may call rescan_scsi_bus(chmax, idmax, lunmax) to scan channels
>   from 0 to chmax, IDs from 0 to idmax, Luns from 0 to lunmax, in all
>   SCSI hosts found in the current directory (that is expected to be
>   /proc/scsi).
>
>   Copyright (C) 2003 Alexandre Oliva <aoliva@redhat.com>
>   based on the rescan-scsi-bus.sh script by Kurt Garloff <garloff@suse.de>
>
>This program is free software; you can redistribute it and/or modify
>it under the terms of the GNU General Public License as published by
>the Free Software Foundation; either version 2, or (at your option)
>any later version.
>
>This program is distributed in the hope that it will be useful, but
>WITHOUT ANY WARRANTY; without even the implied warranty of
>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>General Public License for more details.
>
>You should have received a copy of the GNU General Public License
>along with this program; see the file COPYING.  If not, write to the
>Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
>02111-1307, USA.  */
>
>#include <dirent.h>
>#include <string.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>
>/* Variables to determine the ranges to be scanned for each SCSI host.
>   Set from the arguments passed to rescan_scsi_bus(int, int, int).  */
>static int channel_max, id_max, lun_max;
>
>/* Tell /proc/scsi/scsi to attempt to add a device for all
>   combinations of channel, id and lun in the given SCSI host.  */
>static void
>add_devices_for_host (int host)
>{
>  int channel, id, lun;
>
>  for (channel = 0; channel <= channel_max; channel++)
>    for (id = 0; id <= id_max; id++)
>      for (lun = 0; lun <= lun_max; lun++)
>	{
>	  /* This assumes CWD is /proc/scsi.  */
>	  FILE *proc_scsi_scsi = fopen ("scsi", "w");
>
>	  if (! proc_scsi_scsi)
>	    return;
>
>	  fprintf (proc_scsi_scsi, "scsi add-single-device %i %i %i %i\n",
>		   host, channel, id, lun);
>	  fclose (proc_scsi_scsi);
>	}
>}
>
>/* Look for a files whose names are decimal numbers, take them as a
>   SCSI host numbers and scan them.  */
>static int
>scan_driver_dir (const struct dirent *entry)
>{
>  char *endptr;
>  int host;
>
>  host = strtol (entry->d_name, &endptr, 10);
>  if (*endptr)
>    {
>#if 0
>      if (entry->d_name[0] == '.'
>	  || strcmp (entry->d_name, "add_map") == 0
>	  || strcmp (entry->d_name, "map") == 0
>	  || strcmp (entry->d_name, "mod_parm") == 0)
>	return 0;
>
>      if (strcmp (entry->d_name, "status") == 0)
>	{
>	  /* FIXME: extract host from a line that looks like:
>	     SCSI host number: <number>  
>
>	     This file AFAIK is only present in kernel 2.6, that AFAIK
>	     doesn't really need rescanning.  */
>	  host = ...;
>	}
>      else
>#endif
>	return 0;
>    }
>  add_devices_for_host (host);
>  return 0;
>}
>
>/* Skipping drivers that make no sense to scan, scan scsi hosts.  */
>static int
>rescan_driver_bus (const struct dirent *entry)
>{
>  struct dirent **namelist;
>
>  if (entry->d_name[0] == '.'
>      || strcmp (entry->d_name, "scsi") == 0
>      || strcmp (entry->d_name, "sg") == 0
>      || strcmp (entry->d_name, "dummy") == 0)
>    return 0;
>
>  scandir (entry->d_name, &namelist, scan_driver_dir, NULL);
>
>  return 0;
>}
>
>/* Main entry point.  CWD must be /proc/scsi.  CHMAX, IDMAX and LUNMAX
>   are the maximum numbers to scan in each SCSI host.  */
>void
>rescan_scsi_bus(int chmax, int idmax, int lunmax)
>{
>  struct dirent **namelist;
>
>  channel_max = chmax;
>  id_max = idmax;
>  lun_max = lunmax;
>
>  scandir (".", &namelist, rescan_driver_bus, NULL);
>}
>
>#ifdef MAIN
>int
>main()
>{
>  if (chdir ("/proc/scsi"))
>    return 0;
>  rescan_scsi_bus (0, 7, 0);
>  return 0;
>}
>#endif

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Attachments on bug 103665: 95278 | 95373 | 95374 | 95375