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SubjectRe: Unionmount status?
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:
>>> 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:


>> 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

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