1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h
index cb821d76d1b4..aa82b7caa85f 100644
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -227,6 +227,7 @@ struct bitmap {
         int allclean;
 
         atomic_t behind_writes;
+        unsigned long behind_writes_used; /* highest actual value at runtime */
 
         /*
          * the bitmap daemon - periodically wakes up and sweeps the bitmap