From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: Unionmount status? Date: Wed, 13 Apr 2011 13:26:16 -0400 Message-ID: <4DA5DCB8.3040101@gmail.com> References: <4DA4B6A8.7030804@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, David Howells , Ian Kent , Jeff Moyer , miklos@szeredi.hu, Christoph Hellwig To: Michal Suchanek Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On 04/12/2011 05:36 PM, Michal Suchanek wrote: > On 12 April 2011 22:31, Ric Wheeler wrote: >> On 04/12/2011 11:00 AM, Michal Suchanek wrote: >>> Hello, >>> >>> as some already know the Unionmount VFS union which has been in >>> development for some years now is the only True Union (TM) that can be >>> accepted into the kernel mainline by the VFS maintainers (for reasons >>> of their own which you can surely find if you search the web or ask >>> them directly). >>> >>> The current UnionMount version that can be found here: >>> >>> >>> http://git.kernel.org/?p=linux/kernel/git/val/linux-2.6.git;a=shortlog;h=refs/heads/ext2_works >>> >>> works for me as good as aufs does. That is I can build a live CD using >>> this unioning solution and it boots and runs without any apparent >>> issues. >>> >>> There are probably many possible uses of the union which I did not >>> test nor did I test long term stability of using the unioned >>> filesystem. As far as ephemeral live systems go it works fine for me, >>> though. >>> >>> The issue is that while the code is (nearly) finished it is not yet >>> merged into mainline and as I am not familiar with the details of >>> ever-changing Linux VFS layer forward-porting this code to current >>> kernels is somewhat challenging. >>> >>> What is the plan with unionmount now? >>> >>> What is required for it to be merged into mainline? >>> >>> Thanks >>> >>> Michal >> Hi Michal, >> >> People are actively looking to see what union mount (or overlayfs) solution >> to pursue. Val has shifted her focus away from kernel hacking these days, >> but did refresh her patch set in the last month or so. > I am not aware of such refreshed patch set, at least it is not > published in her repo. > Val posted the refreshed patches with the title on March 22nd: http://lwn.net/Articles/435019/ Ric >> Miklos has an overlay file system that has also been posted upstream. > I have no idea about his other overlay filesystem either. > >> I think that testing like you did and getting more eyes to look at the code >> is the next key step for both projects. >> > Could you provide more details? > > I am not following the Linux fs development closely. > > Thanks > > Michal