On Wed, Jun 24, 2009 at 01:43:35PM +1000, Neil Brown wrote:> Since this test was added, barriers have not worked on md, and (I> think) dm and similar devices that don't use __make_request and so> don't bother to set next_ordered.In dm, we added this:+ blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN, NULL);Alasdair