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

From: Mike Snitzer
Date: Fri May 16 2008 - 15:55:42 EST

On Mon, Feb 18, 2008 at 10:45 PM, Alasdair G Kergon <agk@xxxxxxxxxx> 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?

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at