linux-kernel - Re: Unionmount status?

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Date:	Wed, 13 Apr 2011 20:58:36 +0200
From:	Michal Suchanek <hramrach@...trum.cz>
To:	Ric Wheeler <ricwheeler@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	Ian Kent <ikent@...hat.com>, Jeff Moyer <jmoyer@...hat.com>,
	miklos@...redi.hu, Christoph Hellwig <hch@...radead.org>
Subject: Re: Unionmount status?

On 13 April 2011 19:26, Ric Wheeler <ricwheeler@...il.com> wrote:
> On 04/12/2011 05:36 PM, Michal Suchanek wrote:
>>
>> On 12 April 2011 22:31, Ric Wheeler<ricwheeler@...il.com>  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/
>

That article references the same four months old repo which I
mentioned at the start of the thread, only a slightly different
branch.

While it maybe useful for testing unionmount (which I already tried)
it is not a patch against current kernel which could be used to build
current live images.

Thanks

Michal
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