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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_ROLLBACK_REQUEST_H
#define CEPH_LIBRBD_OPERATION_SNAPSHOT_ROLLBACK_REQUEST_H
#include "librbd/operation/Request.h"
#include "librbd/ImageCtx.h"
#include "librbd/internal.h"
#include "librbd/journal/Types.h"
#include <string>
class Context;
namespace librbd {
class ProgressContext;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class SnapshotRollbackRequest : public Request<ImageCtxT> {
public:
/**
* Snap Rollback goes through the following state machine:
*
* @verbatim
*
* <start> ---------\
* |
* v
* STATE_BLOCK_WRITES
* |
* v
* STATE_RESIZE_IMAGE (skip if resize not
* | required)
* v
* STATE_GET_SNAP_OBJECT_MAP (skip if object)
* | map disabled)
* v
* STATE_ROLLBACK_OBJECT_MAP (skip if object
* | map disabled)
* v
* STATE_ROLLBACK_OBJECTS
* |
* v
* STATE_REFRESH_OBJECT_MAP (skip if object
* | map disabled)
* v
* STATE_INVALIDATE_CACHE (skip if cache
* | disabled)
* v
* <finish>
*
* @endverbatim
*
* The _RESIZE_IMAGE state is skipped if the image doesn't need to be resized.
* The _ROLLBACK_OBJECT_MAP state is skipped if the object map isn't enabled.
* The _INVALIDATE_CACHE state is skipped if the cache isn't enabled.
*/
SnapshotRollbackRequest(ImageCtxT &image_ctx, Context *on_finish,
const cls::rbd::SnapshotNamespace &snap_namespace,
const std::string &snap_name,
uint64_t snap_id,
uint64_t snap_size, ProgressContext &prog_ctx);
~SnapshotRollbackRequest() override;
protected:
void send_op() override;
bool should_complete(int r) override {
return true;
}
journal::Event create_event(uint64_t op_tid) const override {
return journal::SnapRollbackEvent(op_tid, m_snap_namespace, m_snap_name);
}
private:
cls::rbd::SnapshotNamespace m_snap_namespace;
std::string m_snap_name;
uint64_t m_snap_id;
uint64_t m_snap_size;
uint64_t m_head_num_objects;
ProgressContext &m_prog_ctx;
NoOpProgressContext m_no_op_prog_ctx;
bool m_blocking_writes = false;
decltype(ImageCtxT::object_map) m_object_map;
decltype(ImageCtxT::object_map) m_snap_object_map;
void send_block_writes();
Context *handle_block_writes(int *result);
void send_resize_image();
Context *handle_resize_image(int *result);
void send_get_snap_object_map();
Context *handle_get_snap_object_map(int *result);
void send_rollback_object_map();
Context *handle_rollback_object_map(int *result);
void send_rollback_objects();
Context *handle_rollback_objects(int *result);
Context *send_refresh_object_map();
Context *handle_refresh_object_map(int *result);
Context *send_invalidate_cache();
Context *handle_invalidate_cache(int *result);
void apply();
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::SnapshotRollbackRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_ROLLBACK_REQUEST_H
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