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smartmontools/smartmontools/dev_tunnelled.h

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/*
* dev_tunnelled.h
*
* Home page of code is: https://www.smartmontools.org
*
* Copyright (C) 2008-21 Christian Franke
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef DEV_TUNNELLED_H
#define DEV_TUNNELLED_H
#define DEV_TUNNELLED_H_CVSID "$Id$"
#include "dev_interface.h"
/////////////////////////////////////////////////////////////////////////////
// tunnelled_device_base
/// Common functionality for all tunnelled_device classes.
class tunnelled_device_base
: virtual public /*implements*/ smart_device
{
protected:
explicit tunnelled_device_base(smart_device * tunnel_dev);
public:
virtual ~tunnelled_device_base();
virtual bool is_open() const override;
virtual bool open() override;
virtual bool close() override;
virtual bool owns(const smart_device * dev) const override;
virtual void release(const smart_device * dev) override;
private:
smart_device * m_tunnel_base_dev;
};
/////////////////////////////////////////////////////////////////////////////
// tunnelled_device
/// Implement a device by tunneling through another device
template <class BaseDev, class TunnelDev>
class tunnelled_device
: public BaseDev,
public tunnelled_device_base
{
public:
typedef TunnelDev tunnel_device_type;
protected:
explicit tunnelled_device(tunnel_device_type * tunnel_dev)
: smart_device(smart_device::never_called),
tunnelled_device_base(tunnel_dev),
m_tunnel_dev(tunnel_dev)
{ }
// For nvme_device
explicit tunnelled_device(tunnel_device_type * tunnel_dev, unsigned nsid)
: smart_device(smart_device::never_called),
BaseDev(nsid),
tunnelled_device_base(tunnel_dev),
m_tunnel_dev(tunnel_dev)
{ }
public:
virtual void release(const smart_device * dev) override
{
if (m_tunnel_dev == dev)
m_tunnel_dev = 0;
tunnelled_device_base::release(dev);
}
tunnel_device_type * get_tunnel_dev()
{ return m_tunnel_dev; }
const tunnel_device_type * get_tunnel_dev() const
{ return m_tunnel_dev; }
private:
tunnel_device_type * m_tunnel_dev;
};
#endif // DEV_TUNNELLED_H