zil_bp_node_t
const dva_t *dva1 = &((zil_bp_node_t *)x1)->zn_dva;
const dva_t *dva2 = &((zil_bp_node_t *)x2)->zn_dva;
sizeof (zil_bp_node_t), offsetof(zil_bp_node_t, zn_node));
zil_bp_node_t *zn;
kmem_free(zn, sizeof (zil_bp_node_t));
zil_bp_node_t *zn;
zn = kmem_alloc(sizeof (zil_bp_node_t), KM_SLEEP);