Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757243AbZCMKF3 (ORCPT ); Fri, 13 Mar 2009 06:05:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751550AbZCMKFO (ORCPT ); Fri, 13 Mar 2009 06:05:14 -0400 Received: from sh.osrg.net ([192.16.179.4]:50852 "EHLO sh.osrg.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750935AbZCMKFN (ORCPT ); Fri, 13 Mar 2009 06:05:13 -0400 Date: Fri, 13 Mar 2009 19:04:18 +0900 (JST) Message-Id: <20090313.190418.110778375.ryusuke@osrg.net> To: raa.lkml@gmail.com Cc: konishi.ryusuke@lab.ntt.co.jp, akpm@linux-foundation.org, hch@lst.de, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Asking for inclusion of nilfs2 in the mainline kernel From: Ryusuke Konishi In-Reply-To: <81b0412b0903130105y2f9c2430iabaab26d6a8e8188@mail.gmail.com> References: <20090311.015542.118514963.ryusuke@osrg.net> <81b0412b0903130105y2f9c2430iabaab26d6a8e8188@mail.gmail.com> X-Mailer: Mew version 4.2 on Emacs 21.4 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (sh.osrg.net [192.16.179.4]); Fri, 13 Mar 2009 19:04:23 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 992 Lines: 27 Hi! On Fri, 13 Mar 2009 09:05:53 +0100, Alex Riesen wrote: > 2009/3/10 Ryusuke Konishi : > > > > # mount -t nilfs2 -r -o cp=33339 /dev/sdb1 /snap > > (mount the snapshot, then it will become accessible on the mount= point) > > Is it possible to mount a snapshot rw to make it a branch? No, the writable snapshot is not supported. ( So, a readonly option appears in the example. ) Maybe the current design is unfit for efficient branching because nilfs identifies checkpoints with linear numbers and manages lifetime of each on-disk block with a range of the numbers. We might be able to add a feature like replacing the latest filesystem state with a past snapshot, but it's not yet determined. Cheers, Ryusuke -- 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/