1 files changed, 9 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 50902531b7..f5b044fcdb 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -729,6 +729,15 @@ struct BdrvChild {
      */
     bool frozen;
 
+    /*
+     * How many times the parent of this child has been drained
+     * (through role->drained_*).
+     * Usually, this is equal to bs->quiesce_counter (potentially
+     * reduced by bdrv_drain_all_count).  It may differ while the
+     * child is entering or leaving a drained section.
+     */
+    int parent_quiesce_counter;
+
     QLIST_ENTRY(BdrvChild) next;
     QLIST_ENTRY(BdrvChild) next_parent;
 };