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diff --git a/src/ceph/src/osd/mClockOpClassQueue.h b/src/ceph/src/osd/mClockOpClassQueue.h
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+++ b/src/ceph/src/osd/mClockOpClassQueue.h
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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) 2016 Red Hat Inc.
+ *
+ * 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.
+ *
+ */
+
+
+#pragma once
+
+#include <ostream>
+
+#include "boost/variant.hpp"
+
+#include "common/config.h"
+#include "common/ceph_context.h"
+#include "osd/PGQueueable.h"
+
+#include "common/mClockPriorityQueue.h"
+
+
+namespace ceph {
+
+  using Request = std::pair<spg_t, PGQueueable>;
+  using Client = entity_inst_t;
+
+
+  // This class exists to bridge the ceph code, which treats the class
+  // as the client, and the queue, where the class is
+  // osd_op_type_t. So this adpater class will transform calls
+  // appropriately.
+  class mClockOpClassQueue : public OpQueue<Request, Client> {
+
+    enum class osd_op_type_t {
+      client_op, osd_subop, bg_snaptrim, bg_recovery, bg_scrub };
+
+    using queue_t = mClockQueue<Request, osd_op_type_t>;
+
+    queue_t queue;
+
+    struct mclock_op_tags_t {
+      crimson::dmclock::ClientInfo client_op;
+      crimson::dmclock::ClientInfo osd_subop;
+      crimson::dmclock::ClientInfo snaptrim;
+      crimson::dmclock::ClientInfo recov;
+      crimson::dmclock::ClientInfo scrub;
+
+      mclock_op_tags_t(CephContext *cct);
+    };
+
+    static std::unique_ptr<mclock_op_tags_t> mclock_op_tags;
+
+  public:
+
+    mClockOpClassQueue(CephContext *cct);
+
+    static crimson::dmclock::ClientInfo
+    op_class_client_info_f(const osd_op_type_t& op_type);
+
+    inline unsigned length() const override final {
+      return queue.length();
+    }
+
+    // Ops of this priority should be deleted immediately
+    inline void remove_by_class(Client cl,
+				std::list<Request> *out) override final {
+      queue.remove_by_filter(
+	[&cl, out] (const Request& r) -> bool {
+	  if (cl == r.second.get_owner()) {
+	    out->push_front(r);
+	    return true;
+	  } else {
+	    return false;
+	  }
+	});
+    }
+
+    inline void enqueue_strict(Client cl,
+			       unsigned priority,
+			       Request item) override final {
+      queue.enqueue_strict(get_osd_op_type(item), priority, item);
+    }
+
+    // Enqueue op in the front of the strict queue
+    inline void enqueue_strict_front(Client cl,
+				     unsigned priority,
+				     Request item) override final {
+      queue.enqueue_strict_front(get_osd_op_type(item), priority, item);
+    }
+
+    // Enqueue op in the back of the regular queue
+    inline void enqueue(Client cl,
+			unsigned priority,
+			unsigned cost,
+			Request item) override final {
+      queue.enqueue(get_osd_op_type(item), priority, cost, item);
+    }
+
+    // Enqueue the op in the front of the regular queue
+    inline void enqueue_front(Client cl,
+			      unsigned priority,
+			      unsigned cost,
+			      Request item) override final {
+      queue.enqueue_front(get_osd_op_type(item), priority, cost, item);
+    }
+
+    // Returns if the queue is empty
+    inline bool empty() const override final {
+      return queue.empty();
+    }
+
+    // Return an op to be dispatch
+    inline Request dequeue() override final {
+      return queue.dequeue();
+    }
+
+    // Formatted output of the queue
+    void dump(ceph::Formatter *f) const override final;
+
+  protected:
+
+    struct pg_queueable_visitor_t : public boost::static_visitor<osd_op_type_t> {
+      osd_op_type_t operator()(const OpRequestRef& o) const {
+	// don't know if it's a client_op or a
+        return osd_op_type_t::client_op;
+      }
+
+      osd_op_type_t operator()(const PGSnapTrim& o) const {
+        return osd_op_type_t::bg_snaptrim;
+      }
+
+      osd_op_type_t operator()(const PGScrub& o) const {
+        return osd_op_type_t::bg_scrub;
+      }
+
+      osd_op_type_t operator()(const PGRecovery& o) const {
+        return osd_op_type_t::bg_recovery;
+      }
+    }; // class pg_queueable_visitor_t
+
+    static pg_queueable_visitor_t pg_queueable_visitor;
+
+    osd_op_type_t get_osd_op_type(const Request& request);
+  }; // class mClockOpClassAdapter
+
+} // namespace ceph