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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_ROLLBACK_REQUEST_H
#define CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_ROLLBACK_REQUEST_H
#include "include/int_types.h"
#include "librbd/object_map/Request.h"
class Context;
namespace librbd {
class ImageCtx;
namespace object_map {
class SnapshotRollbackRequest : public Request {
public:
/**
* Snapshot rollback goes through the following state machine:
*
* @verbatim
*
* <start>
* |
* v (error)
* STATE_READ_MAP * * * * > STATE_INVALIDATE_MAP
* | |
* v v
* STATE_WRITE_MAP -------> <finish>
*
* @endverbatim
*
* If an error occurs within the READ_MAP state, the associated snapshot's
* object map will be flagged as invalid. Otherwise, an error from any state
* will result in the HEAD object map being flagged as invalid via the base
* class.
*/
enum State {
STATE_READ_MAP,
STATE_INVALIDATE_MAP,
STATE_WRITE_MAP
};
SnapshotRollbackRequest(ImageCtx &image_ctx, uint64_t snap_id,
Context *on_finish)
: Request(image_ctx, CEPH_NOSNAP, on_finish),
m_snap_id(snap_id), m_ret_val(0) {
ceph_assert(snap_id != CEPH_NOSNAP);
}
void send() override;
protected:
bool should_complete(int r) override;
private:
State m_state = STATE_READ_MAP;
uint64_t m_snap_id;
int m_ret_val;
bufferlist m_read_bl;
void send_read_map();
void send_invalidate_map();
void send_write_map();
};
} // namespace object_map
} // namespace librbd
#endif // CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_ROLLBACK_REQUEST_H
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