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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#pragma once
#include <seastar/core/shared_mutex.hh>
#include "crimson/common/operation.h"
#include "crimson/osd/osd_operation.h"
namespace crimson::os::seastore {
struct WritePipeline {
struct ReserveProjectedUsage : OrderedExclusivePhaseT<ReserveProjectedUsage> {
constexpr static auto type_name = "WritePipeline::reserve_projected_usage";
} reserve_projected_usage;
struct OolWritesAndLBAUpdates : UnorderedStageT<OolWritesAndLBAUpdates> {
constexpr static auto type_name = "UnorderedStage::ool_writes_and_update_lba_stage";
} ool_writes_and_lba_updates;
struct Prepare : OrderedExclusivePhaseT<Prepare> {
constexpr static auto type_name = "WritePipeline::prepare_phase";
} prepare;
struct DeviceSubmission : OrderedConcurrentPhaseT<DeviceSubmission> {
constexpr static auto type_name = "WritePipeline::device_submission_phase";
} device_submission;
struct Finalize : OrderedExclusivePhaseT<Finalize> {
constexpr static auto type_name = "WritePipeline::finalize_phase";
} finalize;
using BlockingEvents = std::tuple<
ReserveProjectedUsage::BlockingEvent,
OolWritesAndLBAUpdates::BlockingEvent,
Prepare::BlockingEvent,
DeviceSubmission::BlockingEvent,
Finalize::BlockingEvent
>;
};
/**
* PlaceholderOperation
*
* Once seastore is more complete, I expect to update the externally
* facing interfaces to permit passing the osd level operation through.
* Until then (and for tests likely permanently) we'll use this unregistered
* placeholder for the pipeline phases necessary for journal correctness.
*/
class PlaceholderOperation : public crimson::osd::PhasedOperationT<PlaceholderOperation> {
public:
constexpr static auto type = 0U;
constexpr static auto type_name =
"crimson::os::seastore::PlaceholderOperation";
static PlaceholderOperation::IRef create() {
return IRef{new PlaceholderOperation()};
}
PipelineHandle handle;
WritePipeline::BlockingEvents tracking_events;
PipelineHandle& get_handle() {
return handle;
}
private:
void dump_detail(ceph::Formatter *f) const final {}
void print(std::ostream &) const final {}
};
struct OperationProxy {
OperationRef op;
OperationProxy(OperationRef op) : op(std::move(op)) {}
virtual seastar::future<> enter(WritePipeline::ReserveProjectedUsage&) = 0;
virtual seastar::future<> enter(WritePipeline::OolWritesAndLBAUpdates&) = 0;
virtual seastar::future<> enter(WritePipeline::Prepare&) = 0;
virtual seastar::future<> enter(WritePipeline::DeviceSubmission&) = 0;
virtual seastar::future<> enter(WritePipeline::Finalize&) = 0;
virtual void exit() = 0;
virtual seastar::future<> complete() = 0;
virtual ~OperationProxy() = default;
};
template <typename OpT>
struct OperationProxyT : OperationProxy {
OperationProxyT(typename OpT::IRef op) : OperationProxy(op) {}
OpT* that() {
return static_cast<OpT*>(op.get());
}
const OpT* that() const {
return static_cast<const OpT*>(op.get());
}
seastar::future<> enter(WritePipeline::ReserveProjectedUsage& s) final {
return that()->enter_stage(s);
}
seastar::future<> enter(WritePipeline::OolWritesAndLBAUpdates& s) final {
return that()->enter_stage(s);
}
seastar::future<> enter(WritePipeline::Prepare& s) final {
return that()->enter_stage(s);
}
seastar::future<> enter(WritePipeline::DeviceSubmission& s) final {
return that()->enter_stage(s);
}
seastar::future<> enter(WritePipeline::Finalize& s) final {
return that()->enter_stage(s);
}
void exit() final {
return that()->handle.exit();
}
seastar::future<> complete() final {
return that()->handle.complete();
}
};
struct OrderingHandle {
// we can easily optimize this dynalloc out as all concretes are
// supposed to have exactly the same size.
std::unique_ptr<OperationProxy> op;
seastar::shared_mutex *collection_ordering_lock = nullptr;
// in the future we might add further constructors / template to type
// erasure while extracting the location of tracking events.
OrderingHandle(std::unique_ptr<OperationProxy> op) : op(std::move(op)) {}
OrderingHandle(OrderingHandle &&other)
: op(std::move(other.op)),
collection_ordering_lock(other.collection_ordering_lock) {
other.collection_ordering_lock = nullptr;
}
seastar::future<> take_collection_lock(seastar::shared_mutex &mutex) {
ceph_assert(!collection_ordering_lock);
collection_ordering_lock = &mutex;
return collection_ordering_lock->lock();
}
void maybe_release_collection_lock() {
if (collection_ordering_lock) {
collection_ordering_lock->unlock();
collection_ordering_lock = nullptr;
}
}
template <typename T>
seastar::future<> enter(T &t) {
return op->enter(t);
}
void exit() {
op->exit();
}
seastar::future<> complete() {
return op->complete();
}
~OrderingHandle() {
maybe_release_collection_lock();
}
};
inline OrderingHandle get_dummy_ordering_handle() {
using PlaceholderOpProxy = OperationProxyT<PlaceholderOperation>;
return OrderingHandle{
std::make_unique<PlaceholderOpProxy>(PlaceholderOperation::create())};
}
} // namespace crimson::os::seastore
namespace crimson {
template <>
struct EventBackendRegistry<os::seastore::PlaceholderOperation> {
static std::tuple<> get_backends() {
return {};
}
};
} // namespace crimson
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