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+/*-------------------------------------------------------------------------
+ *
+ * bufmask.h
+ * Definitions for buffer masking routines, used to mask certain bits
+ * in a page which can be different when the WAL is generated
+ * and when the WAL is applied. This is really the job of each
+ * individual rmgr, but we make things easier by providing some
+ * common routines to handle cases which occur in multiple rmgrs.
+ *
+ * Portions Copyright (c) 2016-2021, PostgreSQL Global Development Group
+ *
+ * src/include/access/bufmask.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef BUFMASK_H
+#define BUFMASK_H
+
+#include "storage/block.h"
+#include "storage/bufmgr.h"
+
+/* Marker used to mask pages consistently */
+#define MASK_MARKER 0
+
+extern void mask_page_lsn_and_checksum(Page page);
+extern void mask_page_hint_bits(Page page);
+extern void mask_unused_space(Page page);
+extern void mask_lp_flags(Page page);
+extern void mask_page_content(Page page);
+
+#endif