From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756317Ab0FANSa (ORCPT ); Tue, 1 Jun 2010 09:18:30 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:45770 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755995Ab0FANS1 (ORCPT ); Tue, 1 Jun 2010 09:18:27 -0400 To: Nick Piggin Cc: "Martin K. Petersen" , Christof Schmitt , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: Wrong DIF guard tag on ext2 write From: "Martin K. Petersen" Organization: Oracle References: <20100531112817.GA16260@schmichrtp.mainz.de.ibm.com> <20100531144904.GL9453@laptop> Date: Tue, 01 Jun 2010 09:17:36 -0400 In-Reply-To: <20100531144904.GL9453@laptop> (Nick Piggin's message of "Tue, 1 Jun 2010 00:49:04 +1000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Auth-Type: Internal IP X-Source-IP: acsinet15.oracle.com [141.146.126.227] X-CT-RefId: str=0001.0A090201.4C05089F.00C7:SCFMA922111,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "Nick" == Nick Piggin writes: >> Yep, known bug. Page writeback locking is messed up for buffer_head >> users. The extNfs folks volunteered to look into this a while back >> but I don't think they have found the time yet. Nick> What do you mean by messed up? Allowing modifications to the page Nick> while it is under writeback? This is deliberate of course and not Nick> limited to buffer_head users either. Messed up in the sense that (at least last I looked) very few buffer_head users were aware of the existence of the page writeback bit. -- Martin K. Petersen Oracle Linux Engineering