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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_RENAME_REQUEST_H
#define CEPH_LIBRBD_RENAME_REQUEST_H
#include "librbd/operation/Request.h"
#include <string>
class Context;
namespace librbd {
class ImageCtx;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class RenameRequest : public Request<ImageCtxT>
{
public:
/**
* Rename goes through the following state machine:
*
* @verbatim
*
* <start>
* |
* v
* STATE_READ_DIRECTORY
* |
* v
* STATE_READ_SOURCE_HEADER
* |
* v
* STATE_WRITE_DEST_HEADER
* |
* v
* STATE_UPDATE_DIRECTORY
* |
* v
* STATE_REMOVE_SOURCE_HEADER
* |
* v
* <finish>
*
* @endverbatim
*
*/
enum State {
STATE_READ_DIRECTORY,
STATE_READ_SOURCE_HEADER,
STATE_WRITE_DEST_HEADER,
STATE_UPDATE_DIRECTORY,
STATE_REMOVE_SOURCE_HEADER
};
RenameRequest(ImageCtxT &image_ctx, Context *on_finish,
const std::string &dest_name);
protected:
void send_op() override;
bool should_complete(int r) override;
int filter_return_code(int r) const override;
journal::Event create_event(uint64_t op_tid) const override {
return journal::RenameEvent(op_tid, m_dest_name);
}
private:
std::string m_dest_name;
std::string m_source_oid;
std::string m_dest_oid;
State m_state = STATE_READ_DIRECTORY;
bufferlist m_source_name_bl;
bufferlist m_header_bl;
void send_read_directory();
void send_read_source_header();
void send_write_destination_header();
void send_update_directory();
void send_remove_source_header();
void apply();
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::RenameRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_RENAME_REQUEST_H
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