Index: sbin/geom/class/label/geom_label.c
===================================================================
--- sbin/geom/class/label/geom_label.c
+++ sbin/geom/class/label/geom_label.c
@@ -53,6 +53,7 @@
 static void label_clear(struct gctl_req *req);
 static void label_dump(struct gctl_req *req);
 static void label_label(struct gctl_req *req);
+static void label_refresh(struct gctl_req *req);
 
 struct g_command PUBSYM(class_commands)[] = {
 	{ "clear", G_FLAG_VERBOSE, label_main, G_NULL_OPTS,
@@ -74,6 +75,9 @@
 	{ "label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, label_main, G_NULL_OPTS,
 	    "[-v] name dev"
 	},
+	{ "refresh", 0, label_main, G_NULL_OPTS,
+	    "dev ..."
+	},
 	{ "stop", G_FLAG_VERBOSE, NULL,
 	    {
 		{ 'f', "force", NULL, G_TYPE_BOOL },
@@ -105,6 +109,8 @@
 		label_clear(req);
 	else if (strcmp(name, "dump") == 0)
 		label_dump(req);
+	else if (strcmp(name, "refresh") == 0)
+		label_refresh(req);
 	else
 		gctl_error(req, "Unknown command: %s.", name);
 }
@@ -223,3 +229,29 @@
 		printf("\n");
 	}
 }
+
+static void
+label_refresh(struct gctl_req *req)
+{
+	const char *name;
+	int i, nargs;
+
+	nargs = gctl_get_int(req, "nargs");
+	if (nargs < 1) {
+		gctl_error(req, "Too few arguments.");
+		return;
+	}
+
+	for (i = 0; i < nargs; i++) {
+		name = gctl_get_ascii(req, "arg%d", i);
+		int fd = g_open(name, 1);
+		if (fd == -1) {
+			printf("Can't refresh metadata from %s: %s.\n",
+			    name, strerror(errno));
+		}
+		else {
+			printf("Metadata from %s refreshed.\n", name);
+			(void)g_close(fd);
+		}
+	}
+}
Index: sbin/geom/class/label/glabel.8
===================================================================
--- sbin/geom/class/label/glabel.8
+++ sbin/geom/class/label/glabel.8
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 22, 2013
+.Dd March 10, 2017
 .Dt GLABEL 8
 .Os
 .Sh NAME
@@ -57,6 +57,9 @@
 .Cm dump
 .Ar dev ...
 .Nm
+.Cm refresh
+.Ar dev ...
+.Nm
 .Cm list
 .Nm
 .Cm status
@@ -186,6 +189,8 @@
 Clear metadata on the given devices.
 .It Cm dump
 Dump metadata stored on the given devices.
+.It Cm refresh
+Refresh / rediscover metadata from the given devices.
 .It Cm list
 See
 .Xr geom 8 .
Index: sys/geom/part/g_part.c
===================================================================
--- sys/geom/part/g_part.c
+++ sys/geom/part/g_part.c
@@ -888,6 +888,10 @@
 
 	LIST_FOREACH_SAFE(entry, &table->gpt_entry, gpe_entry, tmp) {
 		if (!entry->gpe_deleted) {
+			/* Notify consumers that provider might be changed. */
+			if (entry->gpe_modified && (
+			    entry->gpe_pp->acw + entry->gpe_pp->ace) == 0)
+				g_media_changed(entry->gpe_pp, 0);
 			entry->gpe_created = 0;
 			entry->gpe_modified = 0;
 			continue;