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// -*- 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
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