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diff --git a/storage/xtradb/include/buf0checksum.h b/storage/xtradb/include/buf0checksum.h
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+++ b/storage/xtradb/include/buf0checksum.h
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+/*****************************************************************************
+
+Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file buf/buf0checksum.h
+Buffer pool checksum functions, also linked from /extra/innochecksum.cc
+
+Created Aug 11, 2011 Vasil Dimov
+*******************************************************/
+
+#ifndef buf0checksum_h
+#define buf0checksum_h
+
+#include "univ.i"
+
+#ifndef UNIV_INNOCHECKSUM
+
+#include "buf0types.h"
+
+#endif /* !UNIV_INNOCHECKSUM */
+
+/********************************************************************//**
+Calculates a page CRC32 which is stored to the page when it is written
+to a file. Note that we must be careful to calculate the same value on
+32-bit and 64-bit architectures.
+@return	checksum */
+UNIV_INTERN
+ib_uint32_t
+buf_calc_page_crc32(
+/*================*/
+	const byte*	page);	/*!< in: buffer page */
+
+/********************************************************************//**
+Calculates a page checksum which is stored to the page when it is written
+to a file. Note that we must be careful to calculate the same value on
+32-bit and 64-bit architectures.
+@return	checksum */
+UNIV_INTERN
+ulint
+buf_calc_page_new_checksum(
+/*=======================*/
+	const byte*	page);	/*!< in: buffer page */
+
+/********************************************************************//**
+In versions < 4.0.14 and < 4.1.1 there was a bug that the checksum only
+looked at the first few bytes of the page. This calculates that old
+checksum.
+NOTE: we must first store the new formula checksum to
+FIL_PAGE_SPACE_OR_CHKSUM before calculating and storing this old checksum
+because this takes that field as an input!
+@return	checksum */
+UNIV_INTERN
+ulint
+buf_calc_page_old_checksum(
+/*=======================*/
+	const byte*	page);	/*!< in: buffer page */
+
+#ifndef UNIV_INNOCHECKSUM
+
+/********************************************************************//**
+Return a printable string describing the checksum algorithm.
+@return	algorithm name */
+UNIV_INTERN
+const char*
+buf_checksum_algorithm_name(
+/*========================*/
+	srv_checksum_algorithm_t	algo);	/*!< in: algorithm */
+
+extern ulong	srv_checksum_algorithm;
+
+#endif /* !UNIV_INNOCHECKSUM */
+
+#endif /* buf0checksum_h */