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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_OBJECT_MAP_SNAPSHOT_CREATE_REQUEST_H
#define CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_CREATE_REQUEST_H
#include "include/int_types.h"
#include "common/bit_vector.hpp"
#include "librbd/object_map/Request.h"
class Context;
class RWLock;
namespace librbd {
class ImageCtx;
namespace object_map {
class SnapshotCreateRequest : public Request {
public:
/**
* Snapshot create goes through the following state machine:
*
* @verbatim
*
* <start>
* |
* v
* STATE_READ_MAP
* |
* v (skip)
* STATE_WRITE_MAP . . . . . . .
* | .
* v v
* STATE_ADD_SNAPSHOT ---> <finish>
*
* @endverbatim
*
* The _ADD_SNAPSHOT state is skipped if the FAST_DIFF feature isn't enabled.
*/
enum State {
STATE_READ_MAP,
STATE_WRITE_MAP,
STATE_ADD_SNAPSHOT
};
SnapshotCreateRequest(ImageCtx &image_ctx, ceph::shared_mutex* object_map_lock,
ceph::BitVector<2> *object_map, uint64_t snap_id,
Context *on_finish)
: Request(image_ctx, snap_id, on_finish),
m_object_map_lock(object_map_lock), m_object_map(*object_map),
m_ret_val(0) {
}
void send() override;
protected:
bool should_complete(int r) override;
private:
ceph::shared_mutex* m_object_map_lock;
ceph::BitVector<2> &m_object_map;
State m_state = STATE_READ_MAP;
bufferlist m_read_bl;
int m_ret_val;
void send_read_map();
void send_write_map();
bool send_add_snapshot();
void update_object_map();
};
} // namespace object_map
} // namespace librbd
#endif // CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_CREATE_REQUEST_H
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