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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_IMAGE_SNAP_SET_REQUEST_H
#define CEPH_LIBRBD_IMAGE_SNAP_SET_REQUEST_H
#include "cls/rbd/cls_rbd_client.h"
#include <string>
class Context;
namespace librbd {
template <typename> class ExclusiveLock;
class ImageCtx;
template <typename> class ObjectMap;
namespace image {
template <typename> class RefreshParentRequest;
template <typename ImageCtxT = ImageCtx>
class SetSnapRequest {
public:
static SetSnapRequest *create(ImageCtxT &image_ctx, uint64_t snap_id,
Context *on_finish) {
return new SetSnapRequest(image_ctx, snap_id, on_finish);
}
~SetSnapRequest();
void send();
private:
/**
* @verbatim
*
* <start>
* |
* | (set snap)
* |-----------> BLOCK_WRITES
* | |
* | v
* | SHUTDOWN_EXCLUSIVE_LOCK (skip if lock inactive
* | | or disabled)
* | v
* | REFRESH_PARENT (skip if no parent
* | | or refresh not needed)
* | v
* | OPEN_OBJECT_MAP (skip if map disabled)
* | |
* | v
* | <apply>
* | |
* | v
* | FINALIZE_REFRESH_PARENT (skip if no parent
* | | or refresh not needed)
* | v
* | <finish>
* |
* \-----------> INIT_EXCLUSIVE_LOCK (skip if active or
* | disabled)
* v
* REFRESH_PARENT (skip if no parent
* | or refresh not needed)
* v
* <apply>
* |
* v
* FINALIZE_REFRESH_PARENT (skip if no parent
* | or refresh not needed)
* v
* <finish>
*
* @endverbatim
*/
SetSnapRequest(ImageCtxT &image_ctx, uint64_t snap_id, Context *on_finish);
ImageCtxT &m_image_ctx;
uint64_t m_snap_id;
Context *m_on_finish;
ExclusiveLock<ImageCtxT> *m_exclusive_lock;
ObjectMap<ImageCtxT> *m_object_map;
RefreshParentRequest<ImageCtxT> *m_refresh_parent;
bool m_writes_blocked;
void send_block_writes();
Context *handle_block_writes(int *result);
void send_init_exclusive_lock();
Context *handle_init_exclusive_lock(int *result);
Context *send_shut_down_exclusive_lock(int *result);
Context *handle_shut_down_exclusive_lock(int *result);
Context *send_refresh_parent(int *result);
Context *handle_refresh_parent(int *result);
Context *send_open_object_map(int *result);
Context *handle_open_object_map(int *result);
Context *send_finalize_refresh_parent(int *result);
Context *handle_finalize_refresh_parent(int *result);
int apply();
void finalize();
void send_complete();
};
} // namespace image
} // namespace librbd
extern template class librbd::image::SetSnapRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_IMAGE_SNAP_SET_REQUEST_H
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