Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753852AbWL1Xyw (ORCPT ); Thu, 28 Dec 2006 18:54:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753888AbWL1Xyv (ORCPT ); Thu, 28 Dec 2006 18:54:51 -0500 Received: from smtp.osdl.org ([65.172.181.25]:43474 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753852AbWL1Xyt (ORCPT ); Thu, 28 Dec 2006 18:54:49 -0500 Date: Thu, 28 Dec 2006 15:54:00 -0800 (PST) From: Linus Torvalds To: Anton Altaparmakov cc: Andrew Morton , Guillaume Chazarain , David Miller , ranma@tdiedrich.de, gordonfarquharson@gmail.com, Marc Haber , Nick Piggin , andrei.popa@i-neo.ro, Linux Kernel Mailing List , Peter Zijlstra , Hugh Dickins , Florian Weimer , Martin Michlmayr , arjan@infradead.org, Chen Kenneth W Subject: Re: 2.6.19 file content corruption on ext3 In-Reply-To: Message-ID: References: <1166314399.7018.6.camel@localhost> <20061217040620.91dac272.akpm@osdl.org> <1166362772.8593.2.camel@localhost> <20061217154026.219b294f.akpm@osdl.org> <45861E68.3060403@yahoo.com.au> <20061217214308.62b9021a.akpm@osdl.org> <20061219085149.GA20442@torres.l21.ma.zugschlus.de> <20061228180536.GB7385@torres.zugschlus.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1042 Lines: 30 On Thu, 28 Dec 2006, Anton Altaparmakov wrote: > > But are chunks 3 and 4 in separate buffer heads? Sorry could not see it > immediately from the output you showed... No, this is a 4kB filesystem. A single bh per page. > It is just that there may be a different cause rather than buffer dirty > state... Sure. > A shot in the dark I know but it could perhaps be that a "COW for > MAP_PRIVATE" like event happens when the page is dirty already thus the > second write never actually makes it to the shared page thus it never gets > written out. There are no private mappings anywhere, and no forks. Just a single mmap (well, we unmap and remap in order to force the page cache to be invalidated properly with the posix_fadvise() thing, but that's literally the only user). Linus - 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/