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diff --git a/storage/innobase/include/buf0checksum.h b/storage/innobase/include/buf0checksum.h
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+++ b/storage/innobase/include/buf0checksum.h
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+/*****************************************************************************
+
+Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2017, 2021, MariaDB Corporation.
+
+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, Fifth Floor, 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
+*******************************************************/
+
+#pragma once
+#include "buf0types.h"
+
+/** Calculate the CRC32 checksum of a page. The value is stored to the page
+when it is written to a file and also checked for a match when reading from
+the file. Note that we must be careful to calculate the same value on all
+architectures.
+@param[in]	page			buffer page (srv_page_size bytes)
+@return	CRC-32C */
+uint32_t buf_calc_page_crc32(const byte* page);
+
+#ifndef UNIV_INNOCHECKSUM
+/** Calculate a 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.
+@param[in]	page	file page (srv_page_size bytes)
+@return checksum */
+uint32_t
+buf_calc_page_new_checksum(const byte* page);
+
+/** In MySQL before 4.0.14 or 4.1.1 there was an InnoDB 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!
+@param[in]	page	file page (srv_page_size bytes)
+@return checksum */
+uint32_t
+buf_calc_page_old_checksum(const byte* page);
+#endif /* !UNIV_INNOCHECKSUM */