Eric Sandeen schrieb:
>
> On Tue, 2002-03-19 at 10:01, Simon Matter wrote:
>
> > This is a fresh install of 7.2 XFS. I have the mentioned lines in
> > /etc/rc.d/init.d/halt.
> >
> > I think that something in the shutdown process is not okay. I remember
> > the bdflush discussion and the vim story. So I think the remount
> > readonly trick does not make shure data is flushed to disk.
> > I enabled write cache again because it doesn't help and tried this
> >
> > [root@gw-linux-dev xinetd.d]# ntsysv ; sleep 40 ; reboot
> >
> > No zeroed files !
>
> Odd.
>
> You said that echoing something into a file just before shutdown did not
> exhibit this problem. Was the target file also on the root filesystem?
>
It was on the same partition. I also used to copy the files from
/root/xinetd.d/ to /etc/xinetd.d and just rebooted after and no zeros.
But I can reproduce it now very easily.
ntsysv (en/disabling rsh) ; reboot : gives zeroed files
ntsysv (en/disabling rsh) ; sleep 40 ; reboot : is okay.
I'm sure ntsysv does something 'interesting' here but from my
understanding it should not be possible to damage the FS in such way. It
seems to me that somehow bdflush does not update the changes ntsysv did.
Is there a way to ensure bdflush does it's job immediately? sync seems
not to do it in this case but what else?
My question is how does the proper shutdown process look like? What we
have is
- kill all processes by SIGTERM
- kill all processes by SIGKILL
- turn off swap, accounting and quota
- unmounting all filesystems
- remount anything left readonly
Now, my stupid question: ntsysv changes depend on bdflush to get written
to disk. Does bdflush survive killall?
BTW: I've just found my .bash_history file zeroed.
> It might also be worth temporarily trying a more recent kernel, just in
> case we're chasing an old bug.
Will also try this.
>
> Otherwise, I wonder if remount,ro is not behaving correctly in this
> case.
>
> -Eric
>
> --
> Eric Sandeen XFS for Linux http://oss.sgi.com/projects/xfs
> sandeen@xxxxxxx SGI, Inc.
--
Simon Matter Tel: +41 61 695 57 35
Fr.Sauter AG / CIT Fax: +41 61 695 53 30
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