[PATCH] Fix _require_scratch test for extN, resierfs, gfs2, and btrfs

[Christoph Hellwig]

On Fri, Jun 19, 2009 at 04:28:21PM -0400, Theodore Ts'o wrote:
> The extN, reiserfs, gfs2, and btrfs filesysytem types should use the
> same check for a block device as XFS and UDF, and not the test for
> NFS, which was checking for host:/foo/bar/baz when checking for a
> scratch device.
> 
> Also, the NFS logic was also incorrect, in that it would allow a
> zero-length SCRATCH_DEV to continue.

Thanks, I've applied this with a small modification to make the local
disk case the default in the case statement so that we don't have to
touch this function when adding support for additional local
filesystems.