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diff --git a/storage/innobase/include/btr0sea.inl b/storage/innobase/include/btr0sea.inl
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index 00000000000..5a8d648029a
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+++ b/storage/innobase/include/btr0sea.inl
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+/*****************************************************************************
+
+Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2018, 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 include/btr0sea.ic
+The index tree adaptive search
+
+Created 2/17/1996 Heikki Tuuri
+*************************************************************************/
+
+#include "dict0mem.h"
+#include "btr0cur.h"
+#include "buf0buf.h"
+
+/** Create and initialize search info.
+@param[in,out]	heap		heap where created
+@return own: search info struct */
+static inline btr_search_t* btr_search_info_create(mem_heap_t* heap)
+{
+	btr_search_t*	info = static_cast<btr_search_t*>(
+		mem_heap_zalloc(heap, sizeof(btr_search_t)));
+	ut_d(info->magic_n = BTR_SEARCH_MAGIC_N);
+#ifdef BTR_CUR_HASH_ADAPT
+	info->n_fields = 1;
+	info->left_side = TRUE;
+#endif /* BTR_CUR_HASH_ADAPT */
+	return(info);
+}
+
+#ifdef BTR_CUR_HASH_ADAPT
+/** Updates the search info.
+@param[in,out]	info	search info
+@param[in,out]	cursor	cursor which was just positioned */
+void btr_search_info_update_slow(btr_search_t *info, btr_cur_t *cursor);
+
+/*********************************************************************//**
+Updates the search info. */
+static inline
+void
+btr_search_info_update(
+/*===================*/
+	dict_index_t*	index,	/*!< in: index of the cursor */
+	btr_cur_t*	cursor)	/*!< in: cursor which was just positioned */
+{
+	ut_ad(!index->is_spatial());
+	ut_ad(!index->table->is_temporary());
+
+	if (!btr_search_enabled) {
+		return;
+	}
+
+	btr_search_t*	info;
+	info = btr_search_get_info(index);
+
+	info->hash_analysis++;
+
+	if (info->hash_analysis < BTR_SEARCH_HASH_ANALYSIS) {
+
+		/* Do nothing */
+
+		return;
+
+	}
+
+	ut_ad(cursor->flag != BTR_CUR_HASH);
+
+	btr_search_info_update_slow(info, cursor);
+}
+
+/** Lock all search latches in exclusive mode. */
+static inline void btr_search_x_lock_all()
+{
+	for (ulint i = 0; i < btr_ahi_parts; ++i) {
+		btr_search_sys.parts[i].latch.wr_lock(SRW_LOCK_CALL);
+	}
+}
+
+/** Unlock all search latches from exclusive mode. */
+static inline void btr_search_x_unlock_all()
+{
+	for (ulint i = 0; i < btr_ahi_parts; ++i) {
+		btr_search_sys.parts[i].latch.wr_unlock();
+	}
+}
+
+/** Lock all search latches in shared mode. */
+static inline void btr_search_s_lock_all()
+{
+	for (ulint i = 0; i < btr_ahi_parts; ++i) {
+		btr_search_sys.parts[i].latch.rd_lock(SRW_LOCK_CALL);
+	}
+}
+
+/** Unlock all search latches from shared mode. */
+static inline void btr_search_s_unlock_all()
+{
+	for (ulint i = 0; i < btr_ahi_parts; ++i) {
+		btr_search_sys.parts[i].latch.rd_unlock();
+	}
+}
+#endif /* BTR_CUR_HASH_ADAPT */