Re: [dm-devel] [PATCH, RFC 2/2] dm: support REQ_FLUSH directly

[Mike Snitzer <snitzer redhat com>]

On Thu, Aug 26 2010 at  6:50pm -0400,
Mike Snitzer <snitzer redhat com> wrote:

> Once we have a need for using request-based DM for something other than
> multipath we can take a fresh look at implementing rq-based FLUSH+FUA.
> 
> Mike
> 
> p.s. I know how hard NEC worked on request-based DM's barrier support;
> so I'm not suggesting this lightly.  For me it just seems like we're
> carrying complexity in DM that hasn't ever been required.

To be clear: the piece that I was saying wasn't required is the need to
for request-based DM to clone a FLUSH to send to multiple targets
(saying as much was just a confusing distraction.. please ignore that).

Anyway, my previous email's question still stands.