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

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Date:	Fri, 15 Feb 2008 14:12:29 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	device-mapper development <dm-devel@...hat.com>,
	Michael Tokarev <mjt@....msk.ru>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] Re: [PATCH] Implement barrier support for single device DM devices

On Fri, Feb 15, 2008 at 03:20:10PM +0100, Andi Kleen wrote:
> On Fri, Feb 15, 2008 at 04:07:54PM +0300, Michael Tokarev wrote:
> > I wonder if it's worth the effort to try to implement this.

My personal view (which seems to be in the minority) is that it's a
waste of our development time *except* in the (rare?) cases similar to
the ones Andi is talking about.

But the decision has already been made for us in the block layer: 
dm is now pretty much required to support (zero-length) barriers.
Unfortunately we didn't get this finished in time for 2.6.25, but we
intend to get it done for 2.6.26:  Woe betide any callers today that
don't handle EOPNOTSUPP!

Alasdair
-- 
agk@...hat.com
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