Refactor the code that creates files with mixed block types that we feed
into CoW tests to make sure that we can tiptoe around that kind of stuff.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
These tests examine the behavior of advanced and tricky copy on write
situations.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>