Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759310AbXEaA6s (ORCPT ); Wed, 30 May 2007 20:58:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754788AbXEaA6h (ORCPT ); Wed, 30 May 2007 20:58:37 -0400 Received: from mx1.redhat.com ([66.187.233.31]:54930 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753952AbXEaA6f (ORCPT ); Wed, 30 May 2007 20:58:35 -0400 Date: Thu, 31 May 2007 01:57:37 +0100 From: Alasdair G Kergon To: device-mapper development Cc: David Chinner , Tejun Heo , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, Jens Axboe , linux-fsdevel@vger.kernel.org, Andreas Dilger Subject: Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md. Message-ID: <20070531005737.GQ25091@agk.fab.redhat.com> Mail-Followup-To: device-mapper development , David Chinner , Tejun Heo , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, Jens Axboe , linux-fsdevel@vger.kernel.org, Andreas Dilger References: <18006.38689.818186.221707@notabene.brown> <18010.12472.209452.148229@notabene.brown> <20070528024559.GA85884050@sgi.com> <18010.17713.76863.245176@notabene.brown> <20070528042926.GC85884050@sgi.com> <18014.6860.989819.665778@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <18014.6860.989819.665778@notabene.brown> User-Agent: Mutt/1.4.1i Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE. Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 459 Lines: 13 On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote: > What if the truth changes (as can happen with md or dm)? You get notified in endio() that the barrier had to be emulated? Alasdair -- agk@redhat.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/