1 files changed, 2 insertions, 0 deletions
diff --git a/buf.h b/buf.h
index 7ab352a..a2a3ec1 100644
--- a/buf.h
+++ b/buf.h
@@ -2,6 +2,8 @@ struct buf {
   int flags;
   uint dev;
   uint sector;
+  struct buf *prev;
+  struct buf *next;
   uchar data[512];
 };
 #define B_BUSY 0x1