From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id 989D66B0038 for ; Sun, 11 Sep 2016 18:57:44 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id x24so322311494pfa.0 for ; Sun, 11 Sep 2016 15:57:44 -0700 (PDT) Received: from mga05.intel.com (mga05.intel.com. [192.55.52.43]) by mx.google.com with ESMTPS id g9si18066563pfk.54.2016.09.11.15.57.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 11 Sep 2016 15:57:43 -0700 (PDT) Date: Sun, 11 Sep 2016 16:57:40 -0600 From: Ross Zwisler Subject: Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Message-ID: <20160911225740.GA32049@linux.intel.com> References: <20160826212934.GA11265@linux.intel.com> <20160829074116.GA16491@infradead.org> <20160829125741.cdnbb2uaditcmnw2@thunk.org> <20160909164808.GC18554@linux.intel.com> <20160910073012.GA5295@infradead.org> <20160910074228.GA23749@infradead.org> <20160911124741.GA746@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160911124741.GA746@infradead.org> Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Hellwig Cc: Matthew Wilcox , Ross Zwisler , Theodore Ts'o , "linux-kernel@vger.kernel.org" , Andrew Morton , "linux-nvdimm@ml01.01.org" , Dave Chinner , "linux-mm@kvack.org" , Andreas Dilger , Alexander Viro , Jan Kara , "linux-fsdevel@vger.kernel.org" , "linux-ext4@vger.kernel.org" On Sun, Sep 11, 2016 at 05:47:41AM -0700, Christoph Hellwig wrote: > On Sat, Sep 10, 2016 at 07:52:53AM +0000, Matthew Wilcox wrote: > > DAX code over to using iomap requires converting all of ext2 away from > > buffer_head; are you saying he's wrong? > > Not sure if he's really saying that, but it's wrong for sure. Just > to prove that I came up with a working ext2 iomap DAX implementation > in a few hours today. I'll take a stab at ext4 and the block device > as well and will post the updated series early next week - I'll need > to take care of a few high priority todo list items first. Yay! Sorry if I was unclear, I wasn't trying to say that we had to change all of ext2 over to using struct iomap. If we can (and apparently we can) just switch over the DAX interfaces, that's good enough to me. I understand that this will mean that we may have overlapping DAX paths for a while (an iomap version and a buffer_head version). I just wanted to figure out whether this overlap would need to be permanent - sounds like not, which is ideal. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org