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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_CREATE_REQUEST_H
#define CEPH_LIBRBD_OPERATION_SNAPSHOT_CREATE_REQUEST_H
#include "cls/rbd/cls_rbd_types.h"
#include "librbd/Types.h"
#include "librbd/operation/Request.h"
#include <string>
class Context;
namespace librbd {
class ImageCtx;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class SnapshotCreateRequest : public Request<ImageCtxT> {
public:
/**
* Snap Create goes through the following state machine:
*
* @verbatim
*
* <start>
* |
* v
* STATE_SUSPEND_REQUESTS
* |
* v
* STATE_SUSPEND_AIO * * * * * * * * * * * * *
* | *
* v *
* STATE_APPEND_OP_EVENT (skip if journal *
* | disabled) *
* (retry) v *
* . . . > STATE_ALLOCATE_SNAP_ID *
* . | *
* . v *
* . . . . STATE_CREATE_SNAP * * * * * * * * * * *
* | * *
* v * *
* STATE_CREATE_OBJECT_MAP (skip if * *
* | disabled) * *
* | * *
* | v *
* | STATE_RELEASE_SNAP_ID *
* | | *
* | v *
* \----------------> <finish> < * * * * *
*
* @endverbatim
*
* The _CREATE_STATE state may repeat back to the _ALLOCATE_SNAP_ID state
* if a stale snapshot context is allocated. If the create operation needs
* to abort, the error path is followed to record the result in the journal
* (if enabled) and bubble the originating error code back to the client.
*/
SnapshotCreateRequest(ImageCtxT &image_ctx, Context *on_finish,
const cls::rbd::SnapshotNamespace &snap_namespace,
const std::string &snap_name,
uint64_t journal_op_tid,
bool skip_object_map);
protected:
void send_op() override;
bool should_complete(int r) override {
return true;
}
bool can_affect_io() const override {
return true;
}
journal::Event create_event(uint64_t op_tid) const override {
return journal::SnapCreateEvent(op_tid, m_snap_namespace, m_snap_name);
}
private:
cls::rbd::SnapshotNamespace m_snap_namespace;
std::string m_snap_name;
bool m_skip_object_map;
int m_ret_val;
uint64_t m_snap_id;
uint64_t m_size;
ParentImageInfo m_parent_info;
void send_suspend_requests();
Context *handle_suspend_requests(int *result);
void send_suspend_aio();
Context *handle_suspend_aio(int *result);
void send_append_op_event();
Context *handle_append_op_event(int *result);
void send_allocate_snap_id();
Context *handle_allocate_snap_id(int *result);
void send_create_snap();
Context *handle_create_snap(int *result);
Context *send_create_object_map();
Context *handle_create_object_map(int *result);
void send_release_snap_id();
Context *handle_release_snap_id(int *result);
void update_snap_context();
void save_result(int *result) {
if (m_ret_val == 0 && *result < 0) {
m_ret_val = *result;
}
}
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::SnapshotCreateRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_CREATE_REQUEST_H
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