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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_OPERATION_REBUILD_OBJECT_MAP_REQUEST_H
#define CEPH_LIBRBD_OPERATION_REBUILD_OBJECT_MAP_REQUEST_H
#include "include/int_types.h"
#include "librbd/AsyncRequest.h"
namespace librbd {
class ImageCtx;
class ProgressContext;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class RebuildObjectMapRequest : public AsyncRequest<ImageCtxT> {
public:
RebuildObjectMapRequest(ImageCtxT &image_ctx, Context *on_finish,
ProgressContext &prog_ctx)
: AsyncRequest<ImageCtxT>(image_ctx, on_finish), m_image_ctx(image_ctx),
m_prog_ctx(prog_ctx), m_attempted_trim(false)
{
}
void send() override;
protected:
bool should_complete(int r) override;
private:
/**
* Rebuild object map goes through the following state machine to
* verify per-object state:
*
* <start>
* . | . . . . . . . . . .
* . | . .
* . v v .
* . STATE_RESIZE_OBJECT_MAP . . . > STATE_TRIM_IMAGE
* . |
* . v
* . . . > STATE_VERIFY_OBJECTS
* |
* v
* STATE_SAVE_OBJECT_MAP
* |
* v
* STATE_UPDATE_HEADER
*
* The _RESIZE_OBJECT_MAP state will be skipped if the object map
* is appropriately sized for the image. The _TRIM_IMAGE state will
* only be hit if the resize failed due to an in-use object.
*/
enum State {
STATE_RESIZE_OBJECT_MAP,
STATE_TRIM_IMAGE,
STATE_VERIFY_OBJECTS,
STATE_SAVE_OBJECT_MAP,
STATE_UPDATE_HEADER
};
ImageCtxT &m_image_ctx;
ProgressContext &m_prog_ctx;
State m_state = STATE_RESIZE_OBJECT_MAP;
bool m_attempted_trim;
void send_resize_object_map();
void send_trim_image();
void send_verify_objects();
void send_save_object_map();
void send_update_header();
uint64_t get_image_size() const;
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::RebuildObjectMapRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_OPERATION_REBUILD_OBJECT_MAP_REQUEST_H
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