vop_getacl
.vop_getacl = (void *)vop_eopnotsupp,
DO_OPS(ops, error, &ap, vop_getacl);
DO_OPS(ap->a_head.a_ops, error, ap, vop_getacl);
vop_getacl(*(vp)->v_ops, vp, type, aclp, cred)
int (*vop_getacl)(struct vop_getacl_args *);
int vop_getacl(struct vop_ops *ops, struct vnode *vp, acl_type_t type,