+ /**
+ * Array of sub-objects. Allocated when top-object is
+ * created (lov_init_raid0()).
+ *
+ * Top-object is a strict master of its sub-objects:
+ * it is created before them, and outlives its
+ * children (this later is necessary so that basic
+ * functions like cl_object_top() always
+ * work). Top-object keeps a reference on every
+ * sub-object.
+ *
+ * When top-object is destroyed (lov_delete_raid0())
+ * it releases its reference to a sub-object and waits
+ * until the latter is finally destroyed.
+ */