From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id B20861BB for ; Mon, 27 Jul 2015 14:33:49 +0000 (UTC) Received: from imap.thunk.org (imap.thunk.org [74.207.234.97]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 06715202 for ; Mon, 27 Jul 2015 14:33:46 +0000 (UTC) Date: Mon, 27 Jul 2015 10:33:42 -0400 From: Theodore Ts'o To: David Woodhouse Message-ID: <20150727143342.GA2851@thunk.org> References: <28240.1437753683@warthog.procyon.org.uk> <1438003184.26913.23.camel@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1438003184.26913.23.camel@infradead.org> Cc: ksummit-discuss@lists.linuxfoundation.org, mszeredi@suse.com Subject: Re: [Ksummit-discuss] [TECH TOPIC] Overlays and file(system) unioning issues List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Mon, Jul 27, 2015 at 02:19:44PM +0100, David Woodhouse wrote: > This was much nicer when it was being done with DT_WHT internally. And > you could *still* expose that to userspace as a 0,0 chardev — or > however you like. Yeah, that was what I was going to propose. We can expose it to userspace as a 0,0 chardev with an inode number of UINT_MAX-1, but that doesn't have to be the internal representation inside the kernel... - Ted