Re: Unionmount status?

From: Michal Suchanek
Date: Tue Apr 12 2011 - 17:37:05 EST

On 12 April 2011 22:31, Ric Wheeler <ricwheeler@xxxxxxxxx> 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:
>> 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 Âfor 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.

> 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.


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