VOP_MMAP
return VOP_MMAP(tvp, ap->a_prot, ap->a_cred);
error = VOP_MMAP(vp, prot, l->l_cred);
error = VOP_MMAP(vp, prot, curlwp->l_cred);
error = VOP_MMAP(vp, prot, cred);
int VOP_MMAP(struct vnode *, vm_prot_t, kauth_cred_t);