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diff --git a/storage/innobase/include/btr0btr.ic b/storage/innobase/include/btr0btr.ic
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+/*****************************************************************************
+
+Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2015, 2020, 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 include/btr0btr.ic
+The B-tree
+
+Created 6/2/1994 Heikki Tuuri
+*******************************************************/
+
+#include "mach0data.h"
+#include "mtr0mtr.h"
+#include "mtr0log.h"
+#include "page0zip.h"
+
+/**************************************************************//**
+Gets the index id field of a page.
+@return index id */
+UNIV_INLINE
+index_id_t
+btr_page_get_index_id(
+/*==================*/
+	const page_t*	page)	/*!< in: index page */
+{
+	return(mach_read_from_8(page + PAGE_HEADER + PAGE_INDEX_ID));
+}
+
+/** Set PAGE_LEVEL.
+@param[in,out]  block  buffer block
+@param[in]      level  page level
+@param[in,out]  mtr    mini-transaction */
+inline
+void btr_page_set_level(buf_block_t *block, ulint level, mtr_t *mtr)
+{
+  ut_ad(level <= BTR_MAX_NODE_LEVEL);
+  constexpr uint16_t field= PAGE_HEADER + PAGE_LEVEL;
+  byte *b= my_assume_aligned<2>(&block->frame[field]);
+  if (mtr->write<2,mtr_t::MAYBE_NOP>(*block, b, level) &&
+      UNIV_LIKELY_NULL(block->page.zip.data))
+    memcpy_aligned<2>(&block->page.zip.data[field], b, 2);
+}
+
+/** Set FIL_PAGE_NEXT.
+@param[in,out]  block  buffer block
+@param[in]      next   number of successor page
+@param[in,out]  mtr    mini-transaction */
+inline void btr_page_set_next(buf_block_t *block, ulint next, mtr_t *mtr)
+{
+  constexpr uint16_t field= FIL_PAGE_NEXT;
+  byte *b= my_assume_aligned<4>(&block->frame[field]);
+  if (mtr->write<4,mtr_t::MAYBE_NOP>(*block, b, next) &&
+      UNIV_LIKELY_NULL(block->page.zip.data))
+    memcpy_aligned<4>(&block->page.zip.data[field], b, 4);
+}
+
+/** Set FIL_PAGE_PREV.
+@param[in,out]  block  buffer block
+@param[in]      prev   number of predecessor page
+@param[in,out]  mtr    mini-transaction */
+inline void btr_page_set_prev(buf_block_t *block, ulint prev, mtr_t *mtr)
+{
+  constexpr uint16_t field= FIL_PAGE_PREV;
+  byte *b= my_assume_aligned<4>(&block->frame[field]);
+  if (mtr->write<4,mtr_t::MAYBE_NOP>(*block, b, prev) &&
+      UNIV_LIKELY_NULL(block->page.zip.data))
+    memcpy_aligned<4>(&block->page.zip.data[field], b, 4);
+}
+
+/**************************************************************//**
+Gets the child node file address in a node pointer.
+NOTE: the offsets array must contain all offsets for the record since
+we read the last field according to offsets and assume that it contains
+the child page number. In other words offsets must have been retrieved
+with rec_get_offsets(n_fields=ULINT_UNDEFINED).
+@return child node address */
+UNIV_INLINE
+uint32_t
+btr_node_ptr_get_child_page_no(
+/*===========================*/
+	const rec_t*	rec,	/*!< in: node pointer record */
+	const rec_offs*	offsets)/*!< in: array returned by rec_get_offsets() */
+{
+	const byte*	field;
+	ulint		len;
+
+	ut_ad(!rec_offs_comp(offsets) || rec_get_node_ptr_flag(rec));
+
+	/* The child address is in the last field */
+	field = rec_get_nth_field(rec, offsets,
+				  rec_offs_n_fields(offsets) - 1, &len);
+
+	ut_ad(len == 4);
+
+	uint32_t page_no = mach_read_from_4(field);
+	ut_ad(page_no > 1);
+
+	return(page_no);
+}
+
+/**************************************************************//**
+Releases the latches on a leaf page and bufferunfixes it. */
+UNIV_INLINE
+void
+btr_leaf_page_release(
+/*==================*/
+	buf_block_t*	block,		/*!< in: buffer block */
+	ulint		latch_mode,	/*!< in: BTR_SEARCH_LEAF or
+					BTR_MODIFY_LEAF */
+	mtr_t*		mtr)		/*!< in: mtr */
+{
+	ut_ad(latch_mode == BTR_SEARCH_LEAF
+	      || latch_mode == BTR_MODIFY_LEAF
+	      || latch_mode == BTR_NO_LATCHES);
+
+	ut_ad(!mtr->memo_contains_flagged(block, MTR_MEMO_MODIFY));
+
+	mtr_memo_type_t mode;
+	switch (latch_mode) {
+		case BTR_SEARCH_LEAF:
+			mode = MTR_MEMO_PAGE_S_FIX;
+			break;
+		case BTR_MODIFY_LEAF:
+			mode = MTR_MEMO_PAGE_X_FIX;
+			break;
+		case BTR_NO_LATCHES:
+			mode = MTR_MEMO_BUF_FIX;
+			break;
+		default:
+			ut_a(0);
+	}
+
+	mtr->memo_release(block, mode);
+}