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that they set v->v_vnlock. This is true for all filesystems in the tree. - Remove all uses of LK_THISLAYER. If the lower layer is locked, the null layer is locked. We only use vget() to get a reference now. null essentially does no locking. This fixes LOOKUP_SHARED with nullfs. - Remove the special LK_DRAIN considerations, I do not believe this is needed now as LK_DRAIN doesn't destroy the lower vnode's lock, and it's hardly used anymore. - Add one well commented hack to prevent the lowervp from going away while we're in it's VOP_LOCK routine. This can only happen if we're forcibly unmounted while some callers are waiting in the lock. In this case the lowervp could be recycled after we drop our last ref in null_reclaim(). Prevent this with a vhold().
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