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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_SNAPSHOT_UNPROTECT_REQUEST_H
#define CEPH_LIBRBD_OPERATION_SNAPSHOT_UNPROTECT_REQUEST_H
#include "librbd/operation/Request.h"
#include <string>
class Context;
namespace librbd {
class ImageCtx;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class SnapshotUnprotectRequest : public Request<ImageCtxT> {
public:
/**
* Snap Unprotect goes through the following state machine:
*
* @verbatim
*
* <start>
* |
* v
* STATE_UNPROTECT_SNAP_START
* |
* v
* STATE_SCAN_POOL_CHILDREN * * * * > STATE_UNPROTECT_SNAP_ROLLBACK
* | |
* v |
* STATE_UNPROTECT_SNAP_FINISH |
* | |
* v |
* <finish> <----------------------------/
*
* @endverbatim
*
* If the unprotect operation needs to abort, the error path is followed
* to rollback the unprotect in-progress status on the image.
*/
enum State {
STATE_UNPROTECT_SNAP_START,
STATE_SCAN_POOL_CHILDREN,
STATE_UNPROTECT_SNAP_FINISH,
STATE_UNPROTECT_SNAP_ROLLBACK
};
SnapshotUnprotectRequest(ImageCtxT &image_ctx, Context *on_finish,
const cls::rbd::SnapshotNamespace &snap_namespace,
const std::string &snap_name);
protected:
void send_op() override;
bool should_complete(int r) override;
int filter_return_code(int r) const override {
if (m_ret_val < 0) {
return m_ret_val;
}
return 0;
}
journal::Event create_event(uint64_t op_tid) const override {
return journal::SnapUnprotectEvent(op_tid, m_snap_namespace, m_snap_name);
}
private:
cls::rbd::SnapshotNamespace m_snap_namespace;
std::string m_snap_name;
State m_state;
int m_ret_val;
uint64_t m_snap_id;
bool should_complete_error();
void send_unprotect_snap_start();
void send_scan_pool_children();
void send_unprotect_snap_finish();
void send_unprotect_snap_rollback();
int verify_and_send_unprotect_snap_start();
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::SnapshotUnprotectRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_UNPROTECT_REQUEST_H
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