Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261361AbVEXGin (ORCPT ); Tue, 24 May 2005 02:38:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261355AbVEXGim (ORCPT ); Tue, 24 May 2005 02:38:42 -0400 Received: from rev.193.226.233.9.euroweb.hu ([193.226.233.9]:36873 "EHLO dorka.pomaz.szeredi.hu") by vger.kernel.org with ESMTP id S261321AbVEXGiK (ORCPT ); Tue, 24 May 2005 02:38:10 -0400 To: mikew@google.com CC: jamie@shareable.org, linuxram@us.ibm.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, akpm@osdl.org, viro@parcelfarce.linux.theplanet.co.uk In-reply-to: <429277CA.9050300@google.com> (message from Mike Waychison on Mon, 23 May 2005 17:39:38 -0700) Subject: Re: [RFC][PATCH] rbind across namespaces References: <1116627099.4397.43.camel@localhost> <1116660380.4397.66.camel@localhost> <20050521134615.GB4274@mail.shareable.org> <429277CA.9050300@google.com> Message-Id: From: Miklos Szeredi Date: Tue, 24 May 2005 07:43:41 +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1731 Lines: 49 > FWIW, all this stuff has already been done and posted here. > > Detachable chunks of vfsmounts: > http://marc.theaimsgroup.com/?l=linux-fsdevel&m=109872862003192&w=2 > > 'Soft' reference counts for manipulating vfsmounts without pinning them > down: > http://marc.theaimsgroup.com/?l=linux-kernel&m=109872797030644&w=2 I think this might just interest Jamie Lokier. He had a very similar poposal recently, but without reference to this patch, so I guess he wasn't aware of it. > Referencing vfsmounts in userspace using a file descriptor: > http://marc.theaimsgroup.com/?l=linux-kernel&m=109871948812782&w=2 Why not just use /proc/PID/fd/FD? > walking mountpoints in userspace: > http://marc.theaimsgroup.com/?l=linux-kernel&m=109875012510262&w=2 Is this needed? Userspace can find out mountpoints from /proc/mounts (or something similar for detached trees). > attaching mountpoints in userspace: > http://marc.theaimsgroup.com/?l=linux-fsdevel&m=109875063100111&w=2 Again, bind from/to /proc/PID/fd/FD should work without any new interfaces. > detaching mountpoints in userspace: > http://marc.theaimsgroup.com/?l=linux-kernel&m=109880051800963&w=2 What's wrong with sys_umount()? > getting info from a vfsmount: > http://marc.theaimsgroup.com/?l=linux-kernel&m=109875135030473&w=2 /proc or /sys should do fine for this purpose I think. I agree, that having "floating trees" could be useful, but I don't see the point of adding new interfaces to support it. Miklos - 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/