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diff --git a/storage/innobase/include/trx0rseg.inl b/storage/innobase/include/trx0rseg.inl
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+++ b/storage/innobase/include/trx0rseg.inl
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+/*****************************************************************************
+
+Copyright (c) 1996, 2013, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2017, 2018, 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/trx0rseg.ic
+Rollback segment
+
+Created 3/26/1996 Heikki Tuuri
+*******************************************************/
+
+#include "srv0srv.h"
+#include "mtr0log.h"
+
+/** Gets a rollback segment header.
+@param[in]	space		space where placed
+@param[in]	page_no		page number of the header
+@param[in,out]	mtr		mini-transaction
+@return rollback segment header, page x-latched */
+UNIV_INLINE
+trx_rsegf_t*
+trx_rsegf_get(fil_space_t* space, ulint page_no, mtr_t* mtr)
+{
+	ut_ad(space == fil_system.sys_space || space == fil_system.temp_space
+	      || srv_is_undo_tablespace(space->id)
+	      || !srv_was_started);
+
+	buf_block_t* block = buf_page_get(page_id_t(space->id, page_no),
+					  0, RW_X_LATCH, mtr);
+
+	buf_block_dbg_add_level(block, SYNC_RSEG_HEADER);
+
+	return TRX_RSEG + block->frame;
+}
+
+/** Gets a newly created rollback segment header.
+@param[in]	space		space where placed
+@param[in]	page_no		page number of the header
+@param[in,out]	mtr		mini-transaction
+@return rollback segment header, page x-latched */
+UNIV_INLINE
+trx_rsegf_t*
+trx_rsegf_get_new(
+	ulint			space,
+	ulint			page_no,
+	mtr_t*			mtr)
+{
+	buf_block_t*	block;
+	trx_rsegf_t*	header;
+
+	ut_ad(space <= srv_undo_tablespaces_active || space == SRV_TMP_SPACE_ID
+	      || !srv_was_started);
+	ut_ad(space <= TRX_SYS_MAX_UNDO_SPACES || space == SRV_TMP_SPACE_ID);
+
+	block = buf_page_get(page_id_t(space, page_no), 0, RW_X_LATCH, mtr);
+
+	buf_block_dbg_add_level(block, SYNC_RSEG_HEADER_NEW);
+
+	header = TRX_RSEG + buf_block_get_frame(block);
+
+	return(header);
+}
+
+/***************************************************************//**
+Sets the file page number of the nth undo log slot. */
+UNIV_INLINE
+void
+trx_rsegf_set_nth_undo(
+/*===================*/
+	trx_rsegf_t*	rsegf,	/*!< in: rollback segment header */
+	ulint		n,	/*!< in: index of slot */
+	ulint		page_no,/*!< in: page number of the undo log segment */
+	mtr_t*		mtr)	/*!< in: mtr */
+{
+	ut_a(n < TRX_RSEG_N_SLOTS);
+
+	mlog_write_ulint(rsegf + TRX_RSEG_UNDO_SLOTS + n * TRX_RSEG_SLOT_SIZE,
+			 page_no, MLOG_4BYTES, mtr);
+}
+
+/****************************************************************//**
+Looks for a free slot for an undo log segment.
+@return slot index or ULINT_UNDEFINED if not found */
+UNIV_INLINE
+ulint
+trx_rsegf_undo_find_free(const trx_rsegf_t* rsegf)
+{
+	ulint		i;
+	ulint		page_no;
+	ulint		max_slots = TRX_RSEG_N_SLOTS;
+
+#ifdef UNIV_DEBUG
+	if (trx_rseg_n_slots_debug) {
+		max_slots = ut_min(static_cast<ulint>(trx_rseg_n_slots_debug),
+				   static_cast<ulint>(TRX_RSEG_N_SLOTS));
+	}
+#endif
+
+	for (i = 0; i < max_slots; i++) {
+		page_no = trx_rsegf_get_nth_undo(rsegf, i);
+
+		if (page_no == FIL_NULL) {
+			return(i);
+		}
+	}
+
+	return(ULINT_UNDEFINED);
+}