Re: Remounting read-only forces filesystem shutdown

[Onis <onion@xxxxxxxxxxx>]

On Thu, Apr 13, 2006 at 12:21:38PM +1000, Nathan Scott wrote:
> On Wed, Apr 12, 2006 at 09:09:29PM -0500, Steve Lord wrote:
> > >> 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?

Yes, dmesg says:

Filesystem "md0": Disabling barriers, not supported by the underlying device

> This patch to fs/xfs/xfs_vfsops.c should fix that right up... I'll get
> it merged in asap.  Looks like the only way to catch some problems is
> to switch things on by default. ;)

This definitely fixes the problem. Now I can boot and leave filesystem clean!

Thanks!

- Onion