From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756923AbYESCX3 (ORCPT ); Sun, 18 May 2008 22:23:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753934AbYESCXS (ORCPT ); Sun, 18 May 2008 22:23:18 -0400 Received: from vsmtp04.dti.ne.jp ([202.216.231.139]:52819 "EHLO vsmtp04.dti.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753392AbYESCXR (ORCPT ); Sun, 18 May 2008 22:23:17 -0400 From: hooanon05@yahoo.co.jp Subject: Re: [PATCH 4/67] aufs configuration To: Jan Engelhardt Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: References: <12109484013324-git-send-email-hooanon05@yahoo.co.jp> <12109484012532-git-send-email-hooanon05@yahoo.co.jp> <12109484012997-git-send-email-hooanon05@yahoo.co.jp> <12109484013051-git-send-email-hooanon05@yahoo.co.jp> Date: Mon, 19 May 2008 11:23:10 +0900 Message-ID: <8238.1211163790@jrobl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Thank you for your review and comments. I will fix as you pointed out. Jan Engelhardt: > >+config AUFS_ROBR > >+ bool "Aufs as an readonly branch of another aufs" > >+ depends on AUFS > >+ default n > >+ help > >+ If you want make your aufs to be a part of another aufs, then > >+ enable this option. In other words, you can specify your aufs > >+ path in 'br:' mount option for another aufs, but cannot > >+ specify 'rw' as the branch permission. > >+ It will damage the performance. > >+ See detail in aufs.5. > > IIRC, unionfs did not need such an option, so why does AUFS? The *current* unionfs doesn't support such nested mount, ie. unionfs as a branch of another unionfs mount. Aufs supports it only readonly mode (if you enable this configuration). > Performance is not "damaged" but "hurt" :-) [or just "will negatively > impact performance"] English language is much more difficult than C language for me... Junjiro Okajima