Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757149Ab1DNNVn (ORCPT ); Thu, 14 Apr 2011 09:21:43 -0400 Received: from mail-gy0-f174.google.com ([209.85.160.174]:64649 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750973Ab1DNNVm (ORCPT ); Thu, 14 Apr 2011 09:21:42 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=uJZZufhCi90cFW8Xo8M8eotBZcPRd7mVFkDaDMRdLJwZtdVMoR/PDlqUxMajnMSPX9 s/fBMPfU04VN3sK4nHCxcOfVEQ70YcFYuIrA+dnIhohvLlMas7hy7/F3zXoe00ckZGm5 BUyf9WQLEQVz+juupEKi+jOp8nrXjgT1O1qO4= Message-ID: <4DA6F4E2.1060005@gmail.com> Date: Thu, 14 Apr 2011 09:21:38 -0400 From: Ric Wheeler User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.38.b3pre.fc13 Thunderbird/3.1.9 MIME-Version: 1.0 To: Miklos Szeredi , Christoph Hellwig CC: Michal Suchanek , Ian Kent , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, David Howells , Jeff Moyer Subject: Re: Unionmount status? References: <4DA4B6A8.7030804@gmail.com> <4DA5DCB8.3040101@gmail.com> <4DA5F569.9020309@gmail.com> <1302756608.2854.10.camel@perseus.themaw.net> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1579 Lines: 39 On 04/14/2011 05:40 AM, Miklos Szeredi wrote: > On Thu, Apr 14, 2011 at 11:32 AM, Michal Suchanek wrote: >> I guess overlayfs includes the better part of unionmount and achieves >> similar level of functionality in much smaller code size and is >> actively developed. >> >> This might make it the best candidate for inclusion so far. >> >> It does not (yet?) support NFS which is one of the options commonly >> used with union solutions, though. > NFS is supported as a lower (read-only) layer, but not as an upper > (read-write) layer. > > Thanks, > Miklos I am not that concerned with the state of Val's repo, her intention was to hand off the project cleanly to others and have them drive the code (that hand off was the posting of the patch set). Several people (Ian, David Howells and Al Viro) had been involved with union mounts recently, so we do have reasonable candidates for a hand off. One of the concerns with unionfs is the duplication of data. Union mounts avoids this with that implementation. That might make unionfs more of a burden for very large file systems, but probably not a concern for many use cases. The union mount patch set is certainly considerably larger. Christoph had expressed some concerns about locking that I think it would be good to discuss again as well. Ric -- 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/