+void
+refcount_transfer(refcount_t *dst, refcount_t *src)
+{
+ int64_t count, removed_count;
+ list_t list, removed;
+
+ list_create(&list, sizeof (reference_t),
+ offsetof(reference_t, ref_link));
+ list_create(&removed, sizeof (reference_t),
+ offsetof(reference_t, ref_link));
+
+ mutex_enter(&src->rc_mtx);
+ count = src->rc_count;
+ removed_count = src->rc_removed_count;
+ src->rc_count = 0;
+ src->rc_removed_count = 0;
+ list_move_tail(&list, &src->rc_list);
+ list_move_tail(&removed, &src->rc_removed);
+ mutex_exit(&src->rc_mtx);
+
+ mutex_enter(&dst->rc_mtx);
+ dst->rc_count += count;
+ dst->rc_removed_count += removed_count;
+ list_move_tail(&dst->rc_list, &list);
+ list_move_tail(&dst->rc_removed, &removed);
+ mutex_exit(&dst->rc_mtx);
+
+ list_destroy(&list);
+ list_destroy(&removed);
+}
+
+#endif /* ZFS_DEBUG */