activation: guard exclusive activation

Add protectional internall error whenever we spot activation
of 'exclusive' only segments in 'non-exclusive' mode.

TODO: possibly the activation locking could be enhanced to handle
this fully behind the scene - as for now this works purely for
lvchange/vgchange activation.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.178 - 
 =====================================
+  Avoid non-exclusive activation of exclusive segment types.
   Fix trimming sibling PVs when doing a pvmove of raid subLVs.
   Preserve exclusive activation during thin snaphost merge.
   Suppress some repeated reads of the same disk data at the device layer.

lib/activate/activate.c

@@ -2568,6 +2568,16 @@ static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
 	struct lvinfo info;
 	int r = 0;
 
+	if (!laopts->exclusive &&
+	    (lv_is_origin(lv) ||
+	     lv_is_pvmove(lv) ||
+	     seg_only_exclusive(first_seg(lv))))  {
+		log_error(INTERNAL_ERROR "Trying non-exlusive activation of %s with "
+			  "a volume type %s requiring exclusive activation.",
+			  display_lvname(lv), lvseg_name(first_seg(lv)));
+		return 0;
+	}
+
 	if (!activation())
 		return 1;