Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756558Ab3CMXG1 (ORCPT ); Wed, 13 Mar 2013 19:06:27 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:53038 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755559Ab3CMXG0 (ORCPT ); Wed, 13 Mar 2013 19:06:26 -0400 Date: Wed, 13 Mar 2013 16:06:23 -0700 From: Andrew Morton To: Miklos Szeredi Cc: viro@ZenIV.linux.org.uk, torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, hch@infradead.org, apw@canonical.com, nbd@openwrt.org, neilb@suse.de, jordipujolp@gmail.com, ezk@fsl.cs.sunysb.edu, dhowells@redhat.com, sedat.dilek@googlemail.com, hooanon05@yahoo.co.jp, mszeredi@suse.cz Subject: Re: [PATCH 8/9] overlay: overlay filesystem documentation Message-Id: <20130313160623.52ec76cd5239c791b59828b8@linux-foundation.org> In-Reply-To: <1363184193-1796-9-git-send-email-miklos@szeredi.hu> References: <1363184193-1796-1-git-send-email-miklos@szeredi.hu> <1363184193-1796-9-git-send-email-miklos@szeredi.hu> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 888 Lines: 25 On Wed, 13 Mar 2013 15:16:32 +0100 Miklos Szeredi wrote: > From: Neil Brown > > Document the overlay filesystem. > Damn, I did it again. This is good, thanks. > +Changes to the underlying filesystems while part of a mounted overlay > +filesystem are not allowed. If the underlying filesystem is changed, > +the behavior of the overlay is undefined, though it will not result in > +a crash or deadlock. ah-hah, there it is. I was wondering how this can-o-worms would be handled ;) Is there anything in place to enforce this at runtime? Checks for read-onlyness, code to prevent rw remounts, etc? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/