Re: Remounting read-only forces filesystem shutdown

[Steve Lord <lord@xxxxxxx>]

Hi Nathan,

I have seen this too, and it is definitely on a system which reports
no barrier support in the devices. Shutdown ends up with exactly
this error - running 2.6.17-rc1 from Linus's git tree as of a
couple of days ago.

Steve

Nathan Scott wrote:
> On Wed, Apr 12, 2006 at 11:37:19PM, Onis <onion@xxxxxxxxxxx> wrote:
> > Hi!
> Hi there Onion,
>
> > When remounting XFS filesystem read-only it causes xfs_force_shutdown and
> > filesystem is unreadable. After umount/mount it is back again. I have
> > 2 partitions with xfs. Both of them are affected. Problem does not occur
> > when using Debian's stock kernel. xfs_check does not report any error.
> >
> > This impacts Debian shutdown script, so that system cannot shutdown
> > properly. Shutdown process just hangs until reset button pressed.
> >
> > To repeat it, just do "mount -o remount,ro /mnt".
> Ah, I think I see the problem - looks like we can enable write
> barriers accidentally during a remount,ro without checking to
> see if the drive likes that idea.  Ugh.
>
> Just to be sure - when you initially mounted the filesystem (rw), did
> you get a dmesg message saying "disabling write barriers" or words to
> that effect?
>
> thanks.