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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_REQUEST_H
#define CEPH_LIBRBD_OPERATION_REQUEST_H
#include "librbd/AsyncRequest.h"
#include "include/Context.h"
#include "common/RWLock.h"
#include "librbd/Utils.h"
#include "librbd/Journal.h"
namespace librbd {
class ImageCtx;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class Request : public AsyncRequest<ImageCtxT> {
public:
Request(ImageCtxT &image_ctx, Context *on_finish,
uint64_t journal_op_tid = 0);
void send();
protected:
void finish(int r) override;
virtual void send_op() = 0;
virtual bool can_affect_io() const {
return false;
}
virtual journal::Event create_event(uint64_t op_tid) const = 0;
template <typename T, Context*(T::*MF)(int*)>
bool append_op_event(T *request) {
ImageCtxT &image_ctx = this->m_image_ctx;
ceph_assert(can_affect_io());
RWLock::RLocker owner_locker(image_ctx.owner_lock);
RWLock::RLocker snap_locker(image_ctx.snap_lock);
if (image_ctx.journal != nullptr) {
if (image_ctx.journal->is_journal_replaying()) {
Context *ctx = util::create_context_callback<T, MF>(request);
replay_op_ready(ctx);
return true;
} else if (image_ctx.journal->is_journal_appending()) {
Context *ctx = util::create_context_callback<T, MF>(request);
append_op_event(ctx);
return true;
}
}
return false;
}
bool append_op_event();
// NOTE: temporary until converted to new state machine format
Context *create_context_finisher(int r);
void finish_and_destroy(int r) override;
private:
struct C_AppendOpEvent : public Context {
Request *request;
Context *on_safe;
C_AppendOpEvent(Request *request, Context *on_safe)
: request(request), on_safe(on_safe) {
}
void finish(int r) override {
if (r >= 0) {
request->m_appended_op_event = true;
}
on_safe->complete(r);
}
};
struct C_CommitOpEvent : public Context {
Request *request;
int ret_val;
C_CommitOpEvent(Request *request, int ret_val)
: request(request), ret_val(ret_val) {
}
void finish(int r) override {
request->handle_commit_op_event(r, ret_val);
delete request;
}
};
uint64_t m_op_tid = 0;
bool m_appended_op_event = false;
bool m_committed_op_event = false;
void replay_op_ready(Context *on_safe);
void append_op_event(Context *on_safe);
void handle_op_event_safe(int r);
bool commit_op_event(int r);
void handle_commit_op_event(int r, int original_ret_val);
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::Request<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_OPERATION_REQUEST_H
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