Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751890AbdIQV1K (ORCPT ); Sun, 17 Sep 2017 17:27:10 -0400 Received: from ipmail01.adl2.internode.on.net ([150.101.137.133]:42445 "EHLO ipmail01.adl2.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751452AbdIQV1J (ORCPT ); Sun, 17 Sep 2017 17:27:09 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A2ApAgDQ575Z//yBpzteGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBhSwnjwmPPAEBAQEBBoEqjReLIYU/BAIChG4VAQIBAQEBAQEBayiFGQE?= =?us-ascii?q?FOhwjEAgDGAklDwUlAyETiiYMrhmLIwEBCAIBJSGDCoMKhVOIOoIxBaEIlEiCC?= =?us-ascii?q?AEXkGWKAIxuNSKBDTIhCBwVh3cuNoptAQEB?= Date: Mon, 18 Sep 2017 07:27:05 +1000 From: Dave Chinner To: Miklos Szeredi Cc: Linus Torvalds , Al Viro , Linux Kernel Mailing List , linux-fsdevel , "linux-unionfs@vger.kernel.org" Subject: Re: [GIT PULL] overlayfs update for 4.14 Message-ID: <20170917212705.GB17782@dastard> References: <20170913140528.GA19278@veci.piliscsaba.szeredi.hu> <20170915073226.GC19278@veci.piliscsaba.szeredi.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 446 Lines: 15 On Fri, Sep 15, 2017 at 10:06:24AM +0200, Miklos Szeredi wrote: > or some way to have a shared page > cache that's breakable on copy up, which does not look trivial at all. If we get that, it will come through overlay using reflink for copyup and filesystems doing the page cache sharing of multiply referenced data blocks. I don't see overlay being involved in this functionality at all.... Cheers, Dave. -- Dave Chinner david@fromorbit.com