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diff --git a/xlators/features/qemu-block/src/coroutine-synctask.h b/xlators/features/qemu-block/src/coroutine-synctask.h
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+++ b/xlators/features/qemu-block/src/coroutine-synctask.h
@@ -0,0 +1,51 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __COROUTINE_SYNCTASK_H
+#define __COROUTINE_SYNCTASK_H
+
+#include "syncop.h"
+#include "block/coroutine_int.h"
+#include "qemu-common.h"
+#include "block/coroutine_int.h"
+
+/*
+  Three entities:
+
+  synctask - glusterfs implementation of xlator friendly lightweight threads
+  Coroutine - qemu coroutine API for its block drivers
+  CoroutineSynctask - implementation of Coroutine using synctasks
+
+  Coroutine is an "embedded" structure inside CoroutineSynctask, called "base".
+
+  E.g:
+
+  Coroutine *co;
+  CoroutineSynctask *cs;
+  struct synctask *synctask;
+
+  cs == synctask->opaque;
+  co == &(cs->base);
+  cs = DO_UPCAST(CoroutineSynctask, base, co);
+  synctask == cs->synctask;
+
+*/
+
+typedef struct {
+	Coroutine base;
+	struct synctask *synctask;
+	CoroutineAction action;
+	bool run;
+	bool die;
+} CoroutineSynctask;
+
+
+
+#endif /* !__COROUTINE_SYNCTASK_H */