Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754108AbXEaBMD (ORCPT ); Wed, 30 May 2007 21:12:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752172AbXEaBLu (ORCPT ); Wed, 30 May 2007 21:11:50 -0400 Received: from netops-testserver-4-out.sgi.com ([192.48.171.29]:33166 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751289AbXEaBLt (ORCPT ); Wed, 30 May 2007 21:11:49 -0400 Date: Thu, 31 May 2007 11:11:27 +1000 From: David Chinner 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 Subject: Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md. Message-ID: <20070531011127.GO86004887@sgi.com> 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> <20070531010739.GR25091@agk.fab.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070531010739.GR25091@agk.fab.redhat.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 718 Lines: 23 On Thu, May 31, 2007 at 02:07:39AM +0100, Alasdair G Kergon wrote: > On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote: > > If a filesystem cares, it could 'ask' as suggested above. > > What would be a good interface for asking? > > XFS already tests: > bd_disk->queue->ordered == QUEUE_ORDERED_NONE The side effects of removing that check is what started this whole discussion. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - 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/