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diff --git a/src/os/bluestore/NVMEDevice.h b/src/os/bluestore/NVMEDevice.h
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+++ b/src/os/bluestore/NVMEDevice.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) 2015 XSky <haomai@xsky.com>
+ *
+ * Author: Haomai Wang <haomaiwang@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.
+ *
+ */
+
+#ifndef CEPH_OS_BLUESTORE_NVMEDEVICE
+#define CEPH_OS_BLUESTORE_NVMEDEVICE
+
+#include <queue>
+#include <map>
+#include <limits>
+
+// since _Static_assert introduced in c11
+#define _Static_assert static_assert
+
+
+#include "include/interval_set.h"
+#include "common/ceph_time.h"
+#include "BlockDevice.h"
+
+enum class IOCommand {
+  READ_COMMAND,
+  WRITE_COMMAND,
+  FLUSH_COMMAND
+};
+
+class SharedDriverData;
+class SharedDriverQueueData;
+
+class NVMEDevice : public BlockDevice {
+  /**
+   * points to pinned, physically contiguous memory region;
+   * contains 4KB IDENTIFY structure for controller which is
+   * target for CONTROLLER IDENTIFY command during initialization
+   */
+  SharedDriverData *driver;
+  string name;
+
+ public:
+  std::atomic_int queue_number = {0};
+  SharedDriverData *get_driver() { return driver; }
+
+  NVMEDevice(CephContext* cct, aio_callback_t cb, void *cbpriv);
+
+  bool supported_bdev_label() override { return false; }
+
+  void aio_submit(IOContext *ioc) override;
+
+  int read(uint64_t off, uint64_t len, bufferlist *pbl,
+           IOContext *ioc,
+           bool buffered) override;
+  int aio_read(
+    uint64_t off,
+    uint64_t len,
+    bufferlist *pbl,
+    IOContext *ioc) override;
+  int aio_write(uint64_t off, bufferlist& bl,
+                IOContext *ioc,
+                bool buffered,
+		int write_hint = WRITE_LIFE_NOT_SET) override;
+  int write(uint64_t off, bufferlist& bl, bool buffered, int write_hint = WRITE_LIFE_NOT_SET) override;
+  int flush() override;
+  int read_random(uint64_t off, uint64_t len, char *buf, bool buffered) override;
+
+  // for managing buffered readers/writers
+  int invalidate_cache(uint64_t off, uint64_t len) override;
+  int open(const string& path) override;
+  void close() override;
+  int collect_metadata(const string& prefix, map<string,string> *pm) const override;
+};
+
+#endif