ncl_commit
int ncl_commit(struct vnode *, u_quad_t, int, struct kauth_cred *,
retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff,
retv = ncl_commit(vp, off, (int)(endoff - off),
retv = ncl_commit(vp, off, (int)size,