[ceph.git] / ceph / src / librbd / journal / DemoteRequest.h

// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

#ifndef CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
#define CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H

#include "common/ceph_mutex.h"
#include "cls/journal/cls_journal_types.h"
#include "journal/Future.h"
#include "librbd/journal/Types.h"
#include "librbd/journal/TypeTraits.h"

struct Context;

namespace librbd {

struct ImageCtx;

namespace journal {

template <typename ImageCtxT = librbd::ImageCtx>
class DemoteRequest {
public:
  static DemoteRequest *create(ImageCtxT &image_ctx, Context *on_finish) {
    return new DemoteRequest(image_ctx, on_finish);
  }

  DemoteRequest(ImageCtxT &image_ctx, Context *on_finish);
  ~DemoteRequest();

  void send();

private:
  /**
   * @verbatim
   *
   * <start>
   *    |
   *    v
   * OPEN_JOURNALER * * * * *
   *    |                   *
   *    v                   *
   * ALLOCATE_TAG * * * * * *
   *    |                   *
   *    v                   *
   * APPEND_EVENT * * *     *
   *    |             *     *
   *    v             *     *
   * COMMIT_EVENT     *     *
   *    |             *     *
   *    v             *     *
   * STOP_APPEND <* * *     *
   *    |                   *
   *    v                   *
   * SHUT_DOWN_JOURNALER <* *
   *    |
   *    v
   * <finish>
   *
   * @endverbatim
   */

  typedef typename TypeTraits<ImageCtxT>::Journaler Journaler;
  typedef typename TypeTraits<ImageCtxT>::Future Future;

  ImageCtxT &m_image_ctx;
  Context *m_on_finish;

  Journaler *m_journaler = nullptr;
  int m_ret_val = 0;

  ceph::mutex m_lock;
  ImageClientMeta m_client_meta;
  uint64_t m_tag_tid = 0;
  TagData m_tag_data;

  cls::journal::Tag m_tag;
  Future m_future;

  void open_journaler();
  void handle_open_journaler(int r);

  void allocate_tag();
  void handle_allocate_tag(int r);

  void append_event();
  void handle_append_event(int r);

  void commit_event();
  void handle_commit_event(int r);

  void stop_append();
  void handle_stop_append(int r);

  void shut_down_journaler();
  void handle_shut_down_journaler(int r);

  void finish(int r);

};

} // namespace journal
} // namespace librbd

extern template class librbd::journal::DemoteRequest<librbd::ImageCtx>;

#endif // CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
Commit	Line	Data
7c673cae FG	1	// -- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t --
	2	// vim: ts=8 sw=2 smarttab
	3
	4	#ifndef CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
	5	#define CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
	6
9f95a23c	7	#include "common/ceph_mutex.h"
7c673cae FG	8	#include "cls/journal/cls_journal_types.h"
	9	#include "journal/Future.h"
	10	#include "librbd/journal/Types.h"
	11	#include "librbd/journal/TypeTraits.h"
	12
	13	struct Context;
	14
	15	namespace librbd {
	16
	17	struct ImageCtx;
	18
	19	namespace journal {
	20
	21	template <typename ImageCtxT = librbd::ImageCtx>
	22	class DemoteRequest {
	23	public:
	24	static DemoteRequest create(ImageCtxT &image_ctx, Context on_finish) {
	25	return new DemoteRequest(image_ctx, on_finish);
	26	}
	27
	28	DemoteRequest(ImageCtxT &image_ctx, Context *on_finish);
	29	~DemoteRequest();
	30
	31	void send();
	32
	33	private:
	34	/**
	35	* @verbatim
	36	*
	37	* <start>
	38	* \|
	39	* v
	40	* OPEN_JOURNALER * * * * *
	41	* \| *
	42	* v *
	43	* ALLOCATE_TAG * * * * * *
	44	* \| *
	45	* v *
	46	* APPEND_EVENT * * * *
	47	* \| * *
	48	* v * *
	49	* COMMIT_EVENT * *
	50	* \| * *
	51	* v * *
	52	* STOP_APPEND <* * * *
	53	* \| *
	54	* v *
	55	* SHUT_DOWN_JOURNALER <* *
	56	* \|
	57	* v
	58	* <finish>
	59	*
	60	* @endverbatim
	61	*/
	62
	63	typedef typename TypeTraits<ImageCtxT>::Journaler Journaler;
	64	typedef typename TypeTraits<ImageCtxT>::Future Future;
	65
	66	ImageCtxT &m_image_ctx;
	67	Context *m_on_finish;
	68
	69	Journaler *m_journaler = nullptr;
	70	int m_ret_val = 0;
	71
9f95a23c	72	ceph::mutex m_lock;
7c673cae FG	73	ImageClientMeta m_client_meta;
	74	uint64_t m_tag_tid = 0;
	75	TagData m_tag_data;
	76
	77	cls::journal::Tag m_tag;
	78	Future m_future;
	79
	80	void open_journaler();
	81	void handle_open_journaler(int r);
	82
	83	void allocate_tag();
	84	void handle_allocate_tag(int r);
	85
	86	void append_event();
	87	void handle_append_event(int r);
	88
	89	void commit_event();
	90	void handle_commit_event(int r);
	91
	92	void stop_append();
	93	void handle_stop_append(int r);
	94
	95	void shut_down_journaler();
	96	void handle_shut_down_journaler(int r);
	97
	98	void finish(int r);
	99
	100	};
	101
	102	} // namespace journal
	103	} // namespace librbd
	104
	105	extern template class librbd::journal::DemoteRequest<librbd::ImageCtx>;
	106
	107	#endif // CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H