1 files changed, 33 insertions, 0 deletions
diff --git a/src/backend/storage/pagenum.h b/src/backend/storage/pagenum.h
new file mode 100644
index 00000000000..f32624c226d
--- /dev/null
+++ b/src/backend/storage/pagenum.h
@@ -0,0 +1,33 @@
+/*-------------------------------------------------------------------------
+ *
+ * pagenum.h--
+ *    POSTGRES page number definitions.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: pagenum.h,v 1.1.1.1 1996/07/09 06:21:53 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	PAGENUM_H
+#define PAGENUM_H
+
+#include "c.h"
+#include "storage/page.h"
+
+typedef uint16	PageNumber;
+
+typedef uint32	LogicalPageNumber;
+
+#define InvalidLogicalPageNumber	0
+
+/*
+ * LogicalPageNumberIsValid --
+ *	True iff the logical page number is valid.
+ */
+#define LogicalPageNumberIsValid(pageNumber) \
+    ((bool)((pageNumber) != InvalidLogicalPageNumber))
+
+
+#endif	/* PAGENUM_H */