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diff --git a/src/ceph/src/rbd_replay/PendingIO.cc b/src/ceph/src/rbd_replay/PendingIO.cc
new file mode 100644
index 0000000..bdf93c9
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+++ b/src/ceph/src/rbd_replay/PendingIO.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Adam Crume <adamcrume@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "PendingIO.hpp"
+#include "rbd_replay_debug.hpp"
+
+#define dout_context g_ceph_context
+
+using namespace std;
+using namespace rbd_replay;
+
+extern "C"
+void rbd_replay_pending_io_callback(librbd::completion_t cb, void *arg) {
+  PendingIO *io = static_cast<PendingIO*>(arg);
+  io->completed(cb);
+}
+
+PendingIO::PendingIO(action_id_t id,
+		     ActionCtx &worker)
+  : m_id(id),
+    m_completion(new librbd::RBD::AioCompletion(this, rbd_replay_pending_io_callback)),
+    m_worker(worker) {
+    }
+
+PendingIO::~PendingIO() {
+  m_completion->release();
+}
+
+void PendingIO::completed(librbd::completion_t cb) {
+  dout(ACTION_LEVEL) << "Completed pending IO #" << m_id << dendl;
+  ssize_t r = m_completion->get_return_value();
+  assertf(r >= 0, "id = %d, r = %d", m_id, r);
+  m_worker.remove_pending(shared_from_this());
+}