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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_RWL_INIT_REQUEST_H
#define CEPH_LIBRBD_CACHE_RWL_INIT_REQUEST_H
class Context;
namespace librbd {
class ImageCtx;
namespace io { class ImageDispatchInterface; }
namespace plugin { template <typename> struct Api; }
namespace cache {
class ImageWritebackInterface;
namespace pwl {
template<typename>
class AbstractWriteLog;
template<typename>
class ImageCacheState;
template <typename ImageCtxT = ImageCtx>
class InitRequest {
public:
static InitRequest* create(
ImageCtxT &image_ctx,
librbd::cache::ImageWritebackInterface& image_writeback,
plugin::Api<ImageCtxT>& plugin_api,
Context *on_finish);
void send();
private:
/**
* @verbatim
*
* Init request goes through the following state machine:
*
* <start>
* |
* v
* GET_IMAGE_CACHE_STATE
* |
* v
* INIT_IMAGE_CACHE
* |
* v
* SET_FEATURE_BIT * * * > CLOSE_IMAGE_CACHE
* | |
* v |
* <finish> <-------------------/
*
* @endverbatim
*/
InitRequest(ImageCtxT &image_ctx,
librbd::cache::ImageWritebackInterface& image_writeback,
plugin::Api<ImageCtxT>& plugin_api,
Context *on_finish);
ImageCtxT &m_image_ctx;
librbd::cache::ImageWritebackInterface& m_image_writeback;
plugin::Api<ImageCtxT>& m_plugin_api;
AbstractWriteLog<ImageCtxT> *m_image_cache;
Context *m_on_finish;
int m_error_result;
bool is_pwl_enabled();
void get_image_cache_state();
void init_image_cache();
void handle_init_image_cache(int r);
void set_feature_bit();
void handle_set_feature_bit(int r);
void shutdown_image_cache();
void handle_shutdown_image_cache(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::InitRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_CACHE_RWL_INIT_REQUEST_H
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