1 files changed, 3 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h
index 311bd2a6fa..07d67ed282 100644
--- a/block_int.h
+++ b/block_int.h
@@ -218,6 +218,9 @@ struct BlockDriverState {
     BlockDriverState *backing_hd;
     BlockDriverState *file;
 
+    /* number of in-flight copy-on-read requests */
+    unsigned int copy_on_read_in_flight;
+
     /* async read/write emulation */
 
     void *sync_aiocb;