1 files changed, 1 insertions, 1 deletions
diff --git a/buf.h b/buf.h
index f18fd87..0745be5 100644
--- a/buf.h
+++ b/buf.h
@@ -2,12 +2,12 @@ struct buf {
   int flags;
   uint dev;
   uint blockno;
+  struct sleeplock lock;
   struct buf *prev; // LRU cache list
   struct buf *next;
   struct buf *qnext; // disk queue
   uchar data[BSIZE];
 };
-#define B_BUSY  0x1  // buffer is locked by some process
 #define B_VALID 0x2  // buffer has been read from disk
 #define B_DIRTY 0x4  // buffer needs to be written to disk