From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261971AbVGEWXr (ORCPT ); Tue, 5 Jul 2005 18:23:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261946AbVGEWXq (ORCPT ); Tue, 5 Jul 2005 18:23:46 -0400 Received: from 69-18-3-179.lisco.net ([69.18.3.179]:59409 "EHLO ninja.slaphack.com") by vger.kernel.org with ESMTP id S261971AbVGEWWE (ORCPT ); Tue, 5 Jul 2005 18:22:04 -0400 Message-ID: <42CB07EB.4000605@slaphack.com> Date: Tue, 05 Jul 2005 17:21:31 -0500 From: David Masover User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050501) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Hans Reiser Cc: Hubert Chan , Ross Biro , Horst von Brand , Kyle Moffett , Valdis.Kletnieks@vt.edu, Lincoln Dale , Gregory Maxwell , Jeff Garzik , Christoph Hellwig , Andrew Morton , linux-kernel@vger.kernel.org, ReiserFS List Subject: Re: reiser4 plugins References: <200506290509.j5T595I6010576@laptop11.inf.utfsm.cl> <87hdfgvqvl.fsf@evinrude.uhoreg.ca> <8783be6605062914341bcff7cb@mail.gmail.com> <878y0svj1h.fsf@evinrude.uhoreg.ca> <42C4F97B.1080803@slaphack.com> <87ll4lynky.fsf@evinrude.uhoreg.ca> <42CB0328.3070706@namesys.com> In-Reply-To: <42CB0328.3070706@namesys.com> X-Enigmail-Version: 0.90.2.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hans Reiser wrote: > Hubert Chan wrote: > > >>On Fri, 01 Jul 2005 03:06:19 -0500, David Masover said: >> >> >> >> >>>Hubert Chan wrote: >>> >>> >> >> >> >> >>>>The main thing blocking file-as-dir is that there are some >>>>locking(IIRC?) issues. And, of course, some people wouldn't want it >>>>to be merged into the mainline kernel. (Of course, the latter >>>>doesn't prevent Namesys from maintaining their own patches for people >>>>to play around with.) >>>> >>>> >> >> >> >> >>>What's the locking issue? I think that was more about transactions... >>> >>> >> >>It was whatever was Al Viro's (technical) complaint about file-as-dir. >>I don't remember exactly what it was. The technical people know what it >>is (and the Namesys guys are probably working on it), and the exact >>issue doesn't concern us non-technical people that much, so I don't feel >>like looking it up. But if you want to, just look for Al Viro's message >>in this thread. >> >> >> > > Cycle detection when hard links to directories are allowed. There is a > debate over whether cycle detection is feasible that can only be > resolved by working code or a formal proof that it is not > computationally feasible. Ah. But then, one solution was to avoid the issue at all, and have the directory inside a file act as a mountpoint. After all, mount --bind doesn't cause problems... Hey! This sounds like metafs (/meta) already! I wonder if we can do file-as-dir in /meta, and just not support user-created hardlinks there? (other than creating brand-new files, of course...)