[PATCH] xfstests: check if the scratch dev pool is mounted in _require_scratch

[Josef Bacik]

On Wed, Jun 26, 2013 at 12:18:04PM -0700, Zach Brown wrote:
> > $SCRATCH_DEV, so anybody who wants to just use the scratch mnt with the scratch
> > dev will fail to work because we never unmount the scratch mount.
> 
> Yeah, this is annoying.
> 
> > Fix this by
> > checking to see if the scratch dev pool is mounted at scratch mnt and unmount it
> > so we can run our test.  This fixes the issue I was seeing by running
> 
> But this fix seems bonkers.  Can we have _scratch_unmount unmount the
> mountpoint instead of the device?  That's what Eric suggested when I
> whined about this a while ago.
> 

Well actually we probably need both, since we need callers of _scratch_umount to
actually work.  But my patch is slightly wrong, I need to be making sure the
device is actually mounted at scratch mnt before I unmount it, otherwise error
out.  Thanks,

Josef