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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_IO_COPYUP_REQUEST_H
#define CEPH_LIBRBD_IO_COPYUP_REQUEST_H
#include "include/int_types.h"
#include "include/rados/librados.hpp"
#include "include/buffer.h"
#include "common/Mutex.h"
#include "common/zipkin_trace.h"
#include "librbd/io/AsyncOperation.h"
#include "librbd/io/Types.h"
#include <string>
#include <vector>
namespace ZTracer { struct Trace; }
namespace librbd {
struct ImageCtx;
namespace io {
template <typename I> class AbstractObjectWriteRequest;
template <typename ImageCtxT = librbd::ImageCtx>
class CopyupRequest {
public:
static CopyupRequest* create(ImageCtxT *ictx, const std::string &oid,
uint64_t objectno, Extents &&image_extents,
const ZTracer::Trace &parent_trace) {
return new CopyupRequest(ictx, oid, objectno, std::move(image_extents),
parent_trace);
}
CopyupRequest(ImageCtxT *ictx, const std::string &oid, uint64_t objectno,
Extents &&image_extents, const ZTracer::Trace &parent_trace);
~CopyupRequest();
void append_request(AbstractObjectWriteRequest<ImageCtxT> *req);
void send();
private:
/**
* Copyup requests go through the following state machine to read from the
* parent image, update the object map, and copyup the object:
*
*
* @verbatim
*
* <start>
* |
* /---------/ \---------\
* | |
* v v
* READ_FROM_PARENT DEEP_COPY
* | |
* \---------\ /---------/
* |
* v (skip if not needed)
* UPDATE_OBJECT_MAPS
* |
* v (skip if not needed)
* COPYUP
* |
* v
* <finish>
*
* @endverbatim
*
* The OBJECT_MAP state is skipped if the object map isn't enabled or if
* an object map update isn't required. The COPYUP state is skipped if
* no data was read from the parent *and* there are no additional ops.
*/
typedef std::vector<AbstractObjectWriteRequest<ImageCtxT> *> WriteRequests;
ImageCtxT *m_image_ctx;
std::string m_oid;
uint64_t m_object_no;
Extents m_image_extents;
ZTracer::Trace m_trace;
bool m_flatten = false;
bool m_copyup_required = true;
bool m_copyup_is_zero = true;
ceph::bufferlist m_copyup_data;
AsyncOperation m_async_op;
std::vector<uint64_t> m_snap_ids;
bool m_first_snap_is_clean = false;
Mutex m_lock;
WriteRequests m_pending_requests;
unsigned m_pending_copyups = 0;
WriteRequests m_restart_requests;
bool m_append_request_permitted = true;
void read_from_parent();
void handle_read_from_parent(int r);
void deep_copy();
void handle_deep_copy(int r);
void update_object_maps();
void handle_update_object_maps(int r);
void copyup();
void handle_copyup(int r);
void finish(int r);
void complete_requests(bool override_restart_retval, int r);
void disable_append_requests();
void remove_from_list();
bool is_copyup_required();
bool is_update_object_map_required(int r);
bool is_deep_copy() const;
void compute_deep_copy_snap_ids();
};
} // namespace io
} // namespace librbd
extern template class librbd::io::CopyupRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_IO_COPYUP_REQUEST_H
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