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diff --git a/extra/mariabackup/read_filt.h b/extra/mariabackup/read_filt.h
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+++ b/extra/mariabackup/read_filt.h
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+/******************************************************
+XtraBackup: hot backup tool for InnoDB
+(c) 2009-2012 Percona Inc.
+Originally Created 3/3/2009 Yasufumi Kinoshita
+Written by Alexey Kopytov, Aleksandr Kuzminsky, Stewart Smith, Vadim Tkachenko,
+Yasufumi Kinoshita, Ignacio Nin and Baron Schwartz.
+
+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  02110-1301, USA
+
+*******************************************************/
+
+/* Data file read filter interface */
+
+#ifndef XB_READ_FILT_H
+#define XB_READ_FILT_H
+
+#include "changed_page_bitmap.h"
+
+struct xb_fil_cur_t;
+
+/* The read filter context */
+struct xb_read_filt_ctxt_t {
+	ib_int64_t		offset;		/*!< current file offset */
+	ib_int64_t		data_file_size;	/*!< data file size */
+	ib_int64_t		buffer_capacity;/*!< read buffer capacity */
+	ulint			space_id;	/*!< space id */
+	/* The following fields used only in bitmap filter */
+	/* Move these to union if any other filters are added in future */
+	xb_page_bitmap_range	*bitmap_range;	/*!< changed page bitmap range
+						iterator for space_id */
+	ulint			page_size;	/*!< page size */
+	ulint			filter_batch_end;/*!< the ending page id of the
+						 current changed page block in
+						 the bitmap */
+};
+
+/* The read filter */
+struct xb_read_filt_t {
+	void (*init)(xb_read_filt_ctxt_t* ctxt,
+		     const xb_fil_cur_t* cursor,
+		     ulint space_id);
+	void (*get_next_batch)(xb_read_filt_ctxt_t* ctxt,
+			       ib_int64_t* read_batch_start,
+			       ib_int64_t* read_batch_len);
+	void (*deinit)(xb_read_filt_ctxt_t* ctxt);
+};
+
+extern xb_read_filt_t rf_pass_through;
+extern xb_read_filt_t rf_bitmap;
+
+#endif