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    SubjectRe: Asking for inclusion of nilfs2 in the mainline kernel
    On Wed, 11 Mar 2009 01:55:42 +0900 (JST)
    Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> wrote:

    > I've been working for the past serveral months to take review comments
    > and to continually solve users' problems come up in mainling list

    Yes, the maintenance has been impressive.

    > (thanks for all giving comments and feedbacks!). Also, I've tried to
    > stabilize API and disk format to restrict additional changes and
    > ensure backward compatibility.

    Well. From the point of view of mainline linux, there is no
    back-compatibility issue, because the fs hasn't been merged yet.

    You perhaps have back-compatibility concerns for existing users of the
    out-of-tree patch, but I'd encourage you to not worry about that too
    much - there will be fairly few users and they are probably pretty
    technical and will be able to cope with a migration. It's a _bit_ hard
    on them but on the other hand, omitting back-compatibility code leads
    to a better implementation for the long term.

    What you should be more concerned about is forward-compatibility. What
    arrangements do you presently have in place to be able to later alter the
    on-disk format without causing too much disruption? Having a strong
    design here will make changes easier to do and will lead to a better
    filesystem.

    Also.. Don't get _too_ concerned about freezing the on-disk format at
    this time. You could put in a mount-time printk("the nilfs on-disk
    format may change at any time - do not place critical data on a nilfs
    filesystem") and we leave that in place for a few months while things
    stabilise.

    And yes, I was planning on sending nilfs in to Linus for 2.6.30 unless
    someone has decent-sounding reasons to hold it back.


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