From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764697AbYETXgL (ORCPT ); Tue, 20 May 2008 19:36:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763018AbYETXfx (ORCPT ); Tue, 20 May 2008 19:35:53 -0400 Received: from mail2.shareable.org ([80.68.89.115]:52531 "EHLO mail2.shareable.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752896AbYETXfw (ORCPT ); Tue, 20 May 2008 19:35:52 -0400 Date: Wed, 21 May 2008 00:35:21 +0100 From: Jamie Lokier To: Theodore Tso Cc: Eric Sandeen , Andi Kleen , Andrew Morton , linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes Message-ID: <20080520233521.GK27853@shareable.org> References: <482DDA56.6000301@redhat.com> <20080516130545.845a3be9.akpm@linux-foundation.org> <482DF44B.50204@redhat.com> <20080516220315.GB15334@shareable.org> <482E08E6.4030507@redhat.com> <8763tbcrbo.fsf@basil.nowhere.org> <20080519004325.GC8335@mit.edu> <4830E60A.2010809@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4830E60A.2010809@redhat.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Eric Sandeen wrote: > I'll propose that very close to 0% of users will ever report "having > barriers off seems to have corrupted my disk on power loss!" even if > that's exactly what happened. And it'd be very tricky to identify in a > post-mortem. Ooh. Might it be possible for fsck to identify certain problems as likely caused by power loss in misordered writes? If metadata sectors had an update generation number, to be compared with journal entries, perhaps that would be more feasible. -- Jamie