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diff --git a/storage/xtradb/include/log0online.h b/storage/xtradb/include/log0online.h
new file mode 100644
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+++ b/storage/xtradb/include/log0online.h
@@ -0,0 +1,191 @@
+/*****************************************************************************
+
+Copyright (c) 2011-2012, Percona Inc. 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., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file include/log0online.h
+Online database log parsing for changed page tracking
+*******************************************************/
+
+#ifndef log0online_h
+#define log0online_h
+
+#include "univ.i"
+#include "os0file.h"
+
+/** Single bitmap file information */
+typedef struct log_online_bitmap_file_struct log_online_bitmap_file_t;
+
+/** A set of bitmap files containing some LSN range */
+typedef struct log_online_bitmap_file_range_struct
+log_online_bitmap_file_range_t;
+
+/** An iterator over changed page info */
+typedef struct log_bitmap_iterator_struct log_bitmap_iterator_t;
+
+/*********************************************************************//**
+Initializes the online log following subsytem. */
+UNIV_INTERN
+void
+log_online_read_init(void);
+/*=======================*/
+
+/*********************************************************************//**
+Shuts down the online log following subsystem. */
+UNIV_INTERN
+void
+log_online_read_shutdown(void);
+/*===========================*/
+
+/*********************************************************************//**
+Reads and parses the redo log up to last checkpoint LSN to build the changed
+page bitmap which is then written to disk.
+
+@return TRUE if log tracking succeeded, FALSE if bitmap write I/O error */
+UNIV_INTERN
+ibool
+log_online_follow_redo_log(void);
+/*=============================*/
+
+/************************************************************//**
+Delete all the bitmap files for data less than the specified LSN.
+If called with lsn == 0 (i.e. set by RESET request) or
+IB_ULONGLONG_MAX, restart the bitmap file sequence, otherwise
+continue it.
+
+@return FALSE to indicate success, TRUE for failure. */
+UNIV_INTERN
+ibool
+log_online_purge_changed_page_bitmaps(
+/*==================================*/
+	ib_uint64_t lsn);	/*!<in: LSN to purge files up to */
+
+/************************************************************//**
+Delete all the bitmap files for data less than the specified LSN.
+If called with lsn == 0 (i.e. set by RESET request) or
+IB_ULONGLONG_MAX, restart the bitmap file sequence, otherwise
+continue it.
+
+@return FALSE to indicate success, TRUE for failure. */
+UNIV_INTERN
+ibool
+log_online_purge_changed_page_bitmaps(
+/*==================================*/
+	ib_uint64_t lsn);	/*!<in: LSN to purge files up to */
+
+#define LOG_BITMAP_ITERATOR_START_LSN(i) \
+	((i).start_lsn)
+#define LOG_BITMAP_ITERATOR_END_LSN(i) \
+	((i).end_lsn)
+#define LOG_BITMAP_ITERATOR_SPACE_ID(i) \
+	((i).space_id)
+#define LOG_BITMAP_ITERATOR_PAGE_NUM(i) \
+	((i).first_page_id + (i).bit_offset)
+#define LOG_BITMAP_ITERATOR_PAGE_CHANGED(i) \
+	((i).changed)
+
+/*********************************************************************//**
+Initializes log bitmap iterator.  The minimum LSN is used for finding the
+correct starting file with records and it there may be records returned by
+the iterator that have LSN less than start_lsn.
+
+@return TRUE if the iterator is initialized OK, FALSE otherwise. */
+UNIV_INTERN
+ibool
+log_online_bitmap_iterator_init(
+/*============================*/
+	log_bitmap_iterator_t	*i,		/*!<in/out:  iterator */
+	ib_uint64_t		min_lsn,	/*!<in: start LSN for the
+						iterator */
+	ib_uint64_t		max_lsn);	/*!<in: end LSN for the
+						iterator */
+
+/*********************************************************************//**
+Releases log bitmap iterator. */
+UNIV_INTERN
+void
+log_online_bitmap_iterator_release(
+/*===============================*/
+	log_bitmap_iterator_t *i); /*!<in/out:  iterator */
+
+/*********************************************************************//**
+Iterates through bits of saved bitmap blocks.
+Sequentially reads blocks from bitmap file(s) and interates through
+their bits. Ignores blocks with wrong checksum.
+@return TRUE if iteration is successful, FALSE if all bits are iterated. */
+UNIV_INTERN
+ibool
+log_online_bitmap_iterator_next(
+/*============================*/
+	log_bitmap_iterator_t *i); /*!<in/out: iterator */
+
+/** Struct for single bitmap file information */
+struct log_online_bitmap_file_struct {
+	char		name[FN_REFLEN];	/*!< Name with full path */
+	os_file_t	file;			/*!< Handle to opened file */
+	ib_uint64_t	size;			/*!< Size of the file */
+	ib_uint64_t	offset;			/*!< Offset of the next read,
+						or count of already-read bytes
+						*/
+};
+
+/** Struct for a set of bitmap files containing some LSN range */
+struct log_online_bitmap_file_range_struct {
+	size_t	count;					/*!< Number of files */
+	/*!< Dynamically-allocated array of info about individual files */
+	struct {
+		char		name[FN_REFLEN];	/*!< Name of a file */
+		ib_uint64_t	start_lsn;		/*!< Starting LSN of
+						        data in	this file */
+		ulong		seq_num;		/*!< Sequence number of
+							this file */
+	}	*files;
+};
+
+/** Struct for an iterator through all bits of changed pages bitmap blocks */
+struct log_bitmap_iterator_struct
+{
+	ibool				failed;		/*!< Has the iteration
+							stopped prematurely */
+	log_online_bitmap_file_range_t	in_files;	/*!< The bitmap files
+							for this iterator */
+	size_t				in_i;		/*!< Currently read
+							file index in in_files
+							*/
+	log_online_bitmap_file_t	in;		/*!< Currently read
+							file */
+	ib_uint32_t			bit_offset;	/*!< bit offset inside
+							the current bitmap
+							block */
+	ib_uint64_t			start_lsn;	/*!< Start LSN of the
+							current bitmap block */
+	ib_uint64_t			end_lsn;	/*!< End LSN of the
+							current bitmap block */
+	ib_uint32_t			space_id;	/*!< Current block
+							space id */
+	ib_uint32_t			first_page_id;	/*!< Id of the first
+							page in the current
+							block */
+	ibool				last_page_in_run;/*!< "Last page in
+							run" flag value for the
+							current block */
+	ibool				changed;	/*!< true if current
+							page was changed */
+	byte*				page;		/*!< Bitmap block */
+};
+
+#endif