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From: Alasdair G Kergon <agk@redhat.com>
To: device-mapper development <dm-devel@redhat.com>,
Michael Tokarev <mjt@tls.msk.ru>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org
Subject: Re: [dm-devel] Re: [PATCH] Implement barrier support for single device DM devices
Date: Fri, 15 Feb 2008 14:12:29 +0000 [thread overview]
Message-ID: <20080215141229.GB1788@agk.fab.redhat.com> (raw)
In-Reply-To: <20080215142010.GA29552@one.firstfloor.org>
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@redhat.com
next prev parent reply other threads:[~2008-02-15 14:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 12:08 [PATCH] Implement barrier support for single device DM devices Andi Kleen
2008-02-15 12:20 ` Alasdair G Kergon
2008-02-15 13:07 ` Michael Tokarev
2008-02-15 14:20 ` Andi Kleen
2008-02-15 14:12 ` Alasdair G Kergon [this message]
2008-02-15 15:34 ` [dm-devel] " Andi Kleen
2008-02-15 15:31 ` Alan Cox
2008-02-18 12:48 ` Ric Wheeler
2008-02-18 13:24 ` Michael Tokarev
2008-02-18 13:52 ` Ric Wheeler
2008-02-19 2:45 ` Alasdair G Kergon
2008-05-16 19:55 ` Mike Snitzer
2008-05-16 21:48 ` Andi Kleen
2008-02-18 22:16 ` David Chinner
2008-02-19 2:56 ` Alasdair G Kergon
2008-02-19 5:36 ` David Chinner
2008-02-19 9:43 ` Andi Kleen
2008-02-19 7:19 ` Jeremy Higdon
2008-02-19 7:58 ` Michael Tokarev
2008-02-20 13:38 ` Ric Wheeler
2008-02-21 3:29 ` Neil Brown
2008-02-21 3:39 ` Neil Brown
2008-02-17 23:31 ` David Chinner
2008-02-19 2:39 ` Alasdair G Kergon
2008-02-19 11:12 ` David Chinner
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