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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_CACHE_PWL_SHUTDOWN_REQUEST_H
#define CEPH_LIBRBD_CACHE_PWL_SHUTDOWN_REQUEST_H
class Context;
namespace librbd {
class ImageCtx;
namespace plugin { template <typename> struct Api; }
namespace cache {
namespace pwl {
template<typename>
class ImageCacheState;
template <typename ImageCtxT = ImageCtx>
class DiscardRequest {
public:
static DiscardRequest* create(
ImageCtxT &image_ctx,
plugin::Api<ImageCtxT>& plugin_api,
Context *on_finish);
void send();
private:
/**
* @verbatim
*
* Shutdown request goes through the following state machine:
*
* <start>
* |
* v
* REMOVE_IMAGE_CACHE_FILE
* |
* v
* REMOVE_IMAGE_CACHE_STATE
* |
* v
* REMOVE_IMAGE_FEATURE_BIT
* |
* v
* <finish>
*
* @endverbatim
*/
DiscardRequest(ImageCtxT &image_ctx,
plugin::Api<ImageCtxT>& plugin_api,
Context *on_finish);
ImageCtxT &m_image_ctx;
ImageCacheState<ImageCtxT>* m_cache_state;
plugin::Api<ImageCtxT>& m_plugin_api;
Context *m_on_finish;
int m_error_result;
void delete_image_cache_file();
void remove_image_cache_state();
void handle_remove_image_cache_state(int r);
void remove_feature_bit();
void handle_remove_feature_bit(int r);
void finish();
void save_result(int result) {
if (m_error_result == 0 && result < 0) {
m_error_result = result;
}
}
};
} // namespace pwl
} // namespace cache
} // namespace librbd
extern template class librbd::cache::pwl::DiscardRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_CACHE_PWL_SHUTDOWN_REQUEST_H
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