Index: sys/geom/part/g_part.c
===================================================================
--- sys/geom/part/g_part.c
+++ sys/geom/part/g_part.c
@@ -135,6 +135,10 @@
 SYSCTL_UINT(_kern_geom_part, OID_AUTO, check_integrity,
     CTLFLAG_RWTUN, &check_integrity, 1,
     "Enable integrity checking");
+static u_int auto_resize = 1;
+SYSCTL_UINT(_kern_geom_part, OID_AUTO, auto_resize,
+    CTLFLAG_RW, &auto_resize, 1,
+    "Enable auto resize");
 
 /*
  * The GEOM partitioning class.
@@ -2095,6 +2099,9 @@
 	G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name));
 	g_topology_assert();
 
+	if (auto_resize == 0)
+		return;
+
 	table = cp->geom->softc;
 	if (table->gpt_opened == 0) {
 		if (g_access(cp, 1, 1, 1) != 0)