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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<ricwheeler@gmail.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/

    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



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