[dm-devel] Re: Write barriers on MD RAID1

[Alasdair G Kergon]

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