Date: Mon, 11 Jan 1999 18:20:55 -0800 (PST) From: Evgeny Roubinchtein <eroubinc@u.washington.edu> To: ARUN KRISHNASWAMY <kar@giasmda.vsnl.net.in> Cc: Jeroen Ruigrok/Asmodai <asmodai@wxs.nl>, questions@FreeBSD.ORG Subject: RE: HDD refuses to sync before shutting down. Message-ID: <Pine.A41.4.05.9901111806360.77462-100000@dante08.u.washington.edu> In-Reply-To: <Pine.SOL.3.96.990110215628.7114A-100000@giasmda>
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On Sun, 10 Jan 1999, ARUN KRISHNASWAMY wrote:
>
> I normally use 'shutdown -h now', or 'shutdown -r now', when I
>want to boot in to Linux. It is with these commands that the sync
>refuses to occur. It works on the generic kernel, but not with the one I
>compiled. Thanks anyway.
Do you mount any Linux ext2fs partitions when you run FreeBSD? (perhaps,
automagically, in you /etc/fstab ?). I read that FreeBSD won't sync the
ext2fs, so they have to be umounted before system shutdown. After
forgetting to do this a couple of times, I moved the real shutdown binary
to shutdown.bin, and replaced shutdown with this simple shell script:
-----%<---------
#!/bin/sh
/root/ext2umount.pl && /sbin/shutdown.bin "$@" || {
echo Cannot umount all ext2fs ; exit 1
}
-----%<-------
where the ext2umount.pl looks like this:
---------%<------
#!/usr/local/bin/perl -w
open(MOUNTPIPE, "/sbin/mount -p|") || die "Cannot talk to /sbin/mount:
$!";
@all_mounted=<MOUNTPIPE>;
close(MOUNTPIPE);
foreach (@all_mounted) {
s/\s+/:/g ;
($_, $mount_point, $type, @_) = split /:/ ;
next unless ($type =~ /ext2fs/i);
print "Trying to umount $mount_point: ext2fs: ";
# if mount umount produces no outpu, assume we umounted OK.
unless ($mount_said = `umount $mount_point 2>&1`) {
print " success\n";
} else {
print "failed: $mount_said" ;
exit 1;
}
}
exit 0 ;
----%<--------
I have since come up with a shell script to do the same thing the perl
script does:
(but was too lazy to try it)
--------%<---------
mount -p | while read device mount_point type rest ; do
# echo $device of type $type mounted on $mount_point
if [ "$type" = "ext2fs" ] ; then
echo -n "Trying to umount ext2fs $device mounted on $mount_point:
"
umount $mount_point && echo "success." || { echo "failed." ; exit
1 ; }
fi
done
-------%<--------
(yes, I know, my perl skills suck).
I hope this helps, I have set the immutable flag on the shutdown shell
script in /sbin/shutdown. I would like to hear from people both in terms
of better shell/perl scripts (perl should be particularly easy to improve
upon), and in terms of security implications of replacing the "real"
binary with a shell script. -- even given the system immutable flag is
set on the file.
--
Evgeny Roubinchtein, eroubinc@u.washington.edu
...................
That does not compute.
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