--- multipath-tools-130222-patched/multipathd/cli_handlers.c	2017-10-12 19:19:08.000000000 +0800
+++ multipath-tools-130222-patched1/multipathd/cli_handlers.c	2017-10-17 14:43:43.000000000 +0800
@@ -593,9 +593,10 @@
 	char * mapname = get_keyparam(v, MAP);
 	struct multipath *mpp;
 	int minor;
-	unsigned long long size;
+	unsigned long long size, sz;
 	struct pathgroup *pgp;
 	struct path *pp;
+	int i,j;
 
 	mapname = convert_dev(mapname, 0);
 	condlog(2, "%s: resize map (operator)", mapname);
@@ -627,6 +628,22 @@
 			mapname);
 		return 1;
 	}
+
+	vector_foreach_slot (mpp->pg, pgp, i) {
+		vector_foreach_slot (pgp->paths, pp, j) {
+			if (!pp->udev || sysfs_get_size(pp, &sz)) {
+				condlog(0, "%s: couldn't get size for sysfs. cannot resize",
+					mapname);
+				return 1;
+			}
+			if (size != sz) {
+				condlog(0, "%s: not all path sizes are equal, please check. cannot resize",
+					mapname);
+				return 1;
+			}
+		}
+	}
+
 	if (size == mpp->size) {
 		condlog(0, "%s: map is still the same size (%llu)", mapname,
 			mpp->size);