[dm-devel] Re: [PATCH] Implement barrier support for single device DM devices

[Mike Snitzer]

On Mon, Feb 18, 2008 at 10:45 PM, Alasdair G Kergon <agk at redhat.com> wrote:
> On Mon, Feb 18, 2008 at 08:52:10AM -0500, Ric Wheeler wrote:
>  > I understand that. Most of the time, dm or md devices are composed of
>  > uniform components which will uniformly support (or not) the cache flush
>  > commands used by barriers.
>
>  As a dm developer, it's "almost none of the time" because trivial
>  configurations aren't the ones that require lots of testing effort.
>
>  Let's stop arguing over "most of the time":-)
>
>  As Andi points out, there are certainly enough real-world users of
>  "single linear or crypt target using one physical device" for it to be
>  worth our supporting it.

Hi Alasdair,

Given that you feel supporting barriers on single device DM targets is
a good thing, what is the status of such support (like Andi's patch)
making it upstream?

Mike