1 files changed, 1 insertions, 0 deletions
diff --git a/buf.h b/buf.h
index 0745be5..3266495 100644
--- a/buf.h
+++ b/buf.h
@@ -3,6 +3,7 @@ struct buf {
   uint dev;
   uint blockno;
   struct sleeplock lock;
+  uint refcnt;
   struct buf *prev; // LRU cache list
   struct buf *next;
   struct buf *qnext; // disk queue