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package Boot::Devfs;
# $Id: Devfs.pm,v 1.3 2003/04/22 21:56:23 pramath Exp $
# Copyright (c) 2002 International Business Machines
# 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 of the License, 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; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# Sean Dague <sean@dague.net>
use strict;
use Carp;
use Data::Dumper;
use Util::Cmd qw(:all);
use Util::Log qw(:all);
use base qw(Exporter);
use vars qw(%DEVFS @EXPORT);
@EXPORT = qw(devfs_lookup);
sub smells_like_devfs {
my $entry = shift;
if($entry =~ m{(disc|ide|scsi|md/\d)}) {
return 1;
}
return 0;
}
sub devfs_lookup {
my $dev = shift;
my $prefix = "";
return $dev unless smells_like_devfs($dev);
if(!scalar(keys %DEVFS)) {
_populate_devfs();
verbose("Devfs table looks like: " . Dumper(\%DEVFS));
}
if($dev =~ s{^(/dev/)}{}) {
$prefix = $1;
}
verbose("Looking up linux entry for devfs entry $dev");
if($dev =~ s{/disc$}{}) {
if($DEVFS{$dev}) {
$dev = $DEVFS{$dev};
verbose("Linux device $dev found for devfs style entry");
}
} elsif ($dev =~ s{/part(\d+)$}{}) {
my $part = $1;
if($DEVFS{$dev}) {
$part = "p".$part if ($dev =~ /(cciss|ida)/);
$dev = $DEVFS{$dev} . $part;
verbose("Linux device $dev found for devfs style entry");
}
} elsif ($DEVFS{$dev}) {
$dev = $DEVFS{$dev};
verbose("Linux device $dev found for devfs style entry");
}
verbose("devfs_lookup returning $prefix$dev");
return $prefix . $dev;
}
sub _populate_devfs {
open(IN,"</proc/partitions") or croak("Couldn't open /proc/partitions for reading.");
my $disks;
my $devfsscsi = 0;
# build the translation table once
while(<IN>) {
$_ =~ s/^\s+//;
# next if header or no text
next if /^(major|$)/;
my ($major, $minor, $blocks, $dev, $crap) = split(/\s+/,$_);
if($dev =~ m{^md/(\d+)$}) {
$DEVFS{$dev} = "md$1";
} elsif($dev =~ m{^(ide/\S+)/disc$}) {
$DEVFS{$1} = _devfs_transform($dev);
} elsif($dev =~ m{^(scsi/\S+)/disc$}) {
# if we have a devfs scsi disk and we want to get
# back to old school format, we just count up each disk
# and assign it to /dev/sdN in order
$DEVFS{$1} = "sd" . chr(97 + $devfsscsi);
$devfsscsi++;
} elsif($dev =~ m{^(cciss|ida)/disc(\d+)/disc$}) {
$DEVFS{"$1/disc$2"} = "$1/c0d$2"
}
}
close(IN);
}
sub _devfs_transform {
my $devfsentry = shift;
my ($type, $host, $bus, $target, $lun, $part) = split(/\//,$devfsentry);
# get rid of the keywords in the sections
$bus =~ s/\D+//g;
$target =~ s/\D+//g;
$part =~ s/\D+//g;
my $realentry = "hd";
my $total = $bus * 2 + $target;
# now we add the real entry... remembering that chr(97) == 'a'
$realentry .= chr(97 + $total);
# add the partition number. $part should always be blank, but
# it is here for completeness sake
$realentry .= $part;
return $realentry;
}
1;
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