From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751240AbbHLVLj (ORCPT ); Wed, 12 Aug 2015 17:11:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46510 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750811AbbHLVLi (ORCPT ); Wed, 12 Aug 2015 17:11:38 -0400 From: Jeff Moyer To: Boaz Harrosh Cc: "Wilcox\, Matthew R" , "linda.knippers\@hp.com" , "linux-kernel\@vger.kernel.org" , "linux-fsdevel\@vger.kernel.org" Subject: Re: regression introduced by "block: Add support for DAX reads/writes to block devices" References: <100D68C7BA14664A8938383216E40DE04091408C@FMSMSX114.amr.corp.intel.com> <100D68C7BA14664A8938383216E40DE0409144D9@FMSMSX114.amr.corp.intel.com> <55C855D5.1070001@plexistor.com> X-PGP-KeyID: 1F78E1B4 X-PGP-CertKey: F6FE 280D 8293 F72C 65FD 5A58 1FF8 A7CA 1F78 E1B4 X-PCLoadLetter: What the f**k does that mean? Date: Wed, 12 Aug 2015 17:11:36 -0400 In-Reply-To: <55C855D5.1070001@plexistor.com> (Boaz Harrosh's message of "Mon, 10 Aug 2015 10:42:13 +0300") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Boaz Harrosh writes: > On 08/07/2015 11:41 PM, Jeff Moyer wrote: > <> >> >>> We need to cope with the case where the end of a partition isn't on a >>> page boundary though. >> >> Well, that's usually done by falling back to buffered I/O. I gave that >> a try and panicked the box. :) I'll keep looking into it, but probably >> won't have another patch until next week. >> > > lets slow down for a sec, please. > > We have all established that an unaligned partition start is BAD and not supported? No. Unaligned partitions on RAID arrays or 512e devices are bad because they result in suboptimal performance. They are most certainly still supported, though. -Jeff