[PATCH 05/10] xfstests: do not unmount tmpfs during remount.

[Christoph Hellwig]

On Tue, Dec 10, 2013 at 12:11:56PM -0800, Junho Ryu wrote:
> Several tests unmount then re-mount the scratch filesystem, to check
> that the content is unchanged; but unmounting a tmpfs is designed to
> lose its content, which causes such tests to fail unnecessarily.  Add
> _scratch_remount(), which instead uses remount on a tmpfs to preserve
> its contents.  Also add _test_remount() to do the same for the test
> device.

All these tests don't make sense if you never unmount the filesystem.
Istead they should exit with _notrun for tmpfs.