Test sharing blocks via reflink and dedupe between two different
mountpoints of the same filesystem. This shouldn't work, since we
don't allow cross-mountpoint functions.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <eguan@redhat.com>