From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id 00AF46B0035 for ; Wed, 8 Jan 2014 00:10:11 -0500 (EST) Received: by mail-pd0-f181.google.com with SMTP id p10so1294192pdj.26 for ; Tue, 07 Jan 2014 21:10:11 -0800 (PST) Received: from mail03-md.ns.itscom.net (mail03-md.ns.itscom.net. [175.177.155.113]) by mx.google.com with ESMTP id fu1si60288287pbc.314.2014.01.07.21.10.10 for ; Tue, 07 Jan 2014 21:10:10 -0800 (PST) From: "J. R. Okajima" Subject: Re: [LSF/MM ATTEND] Stackable Union Filesystem Implementation In-Reply-To: References: <20140107122301.GC16640@quack.suse.cz> Date: Wed, 08 Jan 2014 14:10:09 +0900 Message-ID: <6469.1389157809@jrobl> Sender: owner-linux-mm@kvack.org List-ID: To: Saket Sinha Cc: Jan Kara , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, lsf-pc@lists.linux-foundation.org Saket Sinha: > Several implementations of union file system fusion were evaluated. > The results of the evaluation is shown at the below link- > http://www.4shared.com/download/7IgHqn4tce/1_online.png As far as I know, aufs supports NFS branches and also you can export aufs via NFS. For example, http://sourceforge.net/p/aufs/mailman/message/20639513/ > 2. if only the file metadata are modified, then do not > copy the whole file on the read-write files system but > only the metadata (stored with a file named as the file > itself prefixed by '.me.') Once I have considered such approach to implement it in aufs. But I don't think it a good idea to store metadata in multiple places, one in the original file and the other is in .me. file. For such purpose, a "block device level union" (instead of filesystem level union) may be an option for you, such as "dm snapshot". J. R. Okajima -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org