From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423359AbXBJABF (ORCPT ); Fri, 9 Feb 2007 19:01:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423368AbXBJABE (ORCPT ); Fri, 9 Feb 2007 19:01:04 -0500 Received: from e33.co.us.ibm.com ([32.97.110.151]:55652 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423359AbXBJABD (ORCPT ); Fri, 9 Feb 2007 19:01:03 -0500 Subject: Re: [PATCH 21/22] honor r/w changes at do_remount() time From: Dave Hansen To: Andrew Morton Cc: linux-kernel@vger.kernel.org, hch@infradead.org, Dave Hansen In-Reply-To: <20070209152219.fa61d152.akpm@linux-foundation.org> References: <20070209225329.27619A62@localhost.localdomain> <20070209225344.93A75D35@localhost.localdomain> <20070209152219.fa61d152.akpm@linux-foundation.org> Content-Type: text/plain Date: Fri, 09 Feb 2007 16:00:57 -0800 Message-Id: <1171065657.24675.16.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2007-02-09 at 15:22 -0800, Andrew Morton wrote: > On Fri, 09 Feb 2007 14:53:44 -0800 > Dave Hansen wrote: > > > This is the core of the read-only bind mount patch set. > > Who wants read-only bind mounts, and for what reason? The original desire came out of the linux-vserver project. It allows a sysadmin to share directories between many vservers/containers and keep those containers from writing to it, even though the users in that vserver may have "root" privileges. This also has the advantage of cleaning up the somewhat hackish "look for writable-open-files during remount/ro operations". It should also allow us to separate the concepts of the user wanting a filesystem to be r/o and the filesystem _itself_ being r/o because of a r/o device or some kind of corruption. -- Dave