[Drbd-dev] [GIT PULL] DRBD for 2.6.32
fujita.tomonori at lab.ntt.co.jp
Tue Sep 22 00:27:21 CEST 2009
On Mon, 21 Sep 2009 18:53:21 +0200
Lars Ellenberg <lars.ellenberg at linbit.com> wrote:
> On Mon, Sep 21, 2009 at 04:52:52PM +0200, Arjan van de Ven wrote:
> > On Mon, 21 Sep 2009 16:43:08 +0200
> > Lars Ellenberg <lars.ellenberg at linbit.com> wrote:
> > > We can choose whatever user-kernel interface you like,
> > > and change it with every dot release --
> > > we'd just need to add additional compat code into
> > > the drbdsetup userland binary.
> > uh no.
> > the kernel<->userspace ABI is stable.
> > we don't go about randomly changing it
> > (extending it is fine obviously)
> That's not what I meant, of course that is and needs to be stable.
> Sorry, I exagerated to make a point.
> Point was:
> mdadm configured md.
> dmsetup configured dm.
> drbdsetup configure drbd.
> If and when "something" is done to "unify" things on the implementation
> level, it is likely to also unify the "kernel<->userspace" configuration
> If it happens, once that happens, that _will_ be an ABI break.
You misunderstand the raid unification.
We will not unify the kernel<->userspace configuration interface
because we can't break the kernel<->userspace ABI.
We plan to unify the multiple device frameworks, but the unified
framework must support the all existing ABIs.
So adding another 'drbd' ABI hurts us.
More information about the drbd-dev