From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH] ext4: introduce per-inode DAX flag Date: Fri, 11 Aug 2017 03:01:47 -0700 Message-ID: <20170811100147.GB7064@infradead.org> References: <1501690186-17607-1-git-send-email-lczerner@redhat.com> <20170805084601.GA12425@infradead.org> <20170807121212.nuiho4afmdjf5vsd@rh_laptop> <20170808090016.lxfbcrhoybmyfvlc@rh_laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: Christoph Hellwig , linux-ext4@vger.kernel.org Return-path: Received: from bombadil.infradead.org ([65.50.211.133]:49232 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752649AbdHKKBr (ORCPT ); Fri, 11 Aug 2017 06:01:47 -0400 Content-Disposition: inline In-Reply-To: <20170808090016.lxfbcrhoybmyfvlc@rh_laptop> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Tue, Aug 08, 2017 at 11:00:16AM +0200, Lukas Czerner wrote: > So I've read the thread where you talk about this. I do not see anything > about it being a masive mistake. I only see that you're confident that's > it's a wrong thing to do. Like you're ever not confident about > something;) Care to elaborate on what's wrong with it and why we do not > want it ? On the surface it does look like a usefull option to have. The problem is that DAX is an implementation detail on how to write data back. It has absolutely no user visible semantics. Encoding such a detail in the on-disk format is not a good idea.