Btrfs had some issues with fsync()'ing directories and fsync()'ing
after renames. These three new tests cover the 3 different issues
we were seeing. This breaks out the dmflakey stuff into a common
helper to be shared between generic/311 and this new test.
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Josef Bacik