1 files changed, 3 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h
index 781789c9e1..e1943aaa64 100644
--- a/block_int.h
+++ b/block_int.h
@@ -121,6 +121,9 @@ struct BlockDriverState {
     uint64_t rd_ops;
     uint64_t wr_ops;
 
+    /* Whether the disk can expand beyond total_sectors */
+    int growable;
+
     /* NOTE: the following infos are only hints for real hardware
        drivers. They are not used by the block driver */
     int cyls, heads, secs, translation;