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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2018 Red Hat, Inc.
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#pragma once
#include "include/rados/librados_fwd.hpp"
#include <boost/intrusive/list.hpp>
#include "rgw_common.h"
#include "services/svc_rados.h" // cant forward declare RGWSI_RADOS::Obj
namespace rgw {
struct AioResult {
RGWSI_RADOS::Obj obj;
uint64_t id = 0; // id allows caller to associate a result with its request
bufferlist data; // result buffer for reads
int result = 0;
};
struct AioResultEntry : AioResult, boost::intrusive::list_base_hook<> {
virtual ~AioResultEntry() {}
};
// a list of polymorphic entries that frees them on destruction
template <typename T, typename ...Args>
struct OwningList : boost::intrusive::list<T, Args...> {
OwningList() = default;
~OwningList() { this->clear_and_dispose(std::default_delete<T>{}); }
OwningList(OwningList&&) = default;
OwningList& operator=(OwningList&&) = default;
OwningList(const OwningList&) = delete;
OwningList& operator=(const OwningList&) = delete;
};
using AioResultList = OwningList<AioResultEntry>;
// returns the first error code or 0 if all succeeded
inline int check_for_errors(const AioResultList& results) {
for (auto& e : results) {
if (e.result < 0) {
return e.result;
}
}
return 0;
}
// interface to submit async librados operations and wait on their completions.
// each call returns a list of results from prior completions
class Aio {
public:
virtual ~Aio() {}
virtual AioResultList submit(RGWSI_RADOS::Obj& obj,
librados::ObjectReadOperation *op,
uint64_t cost, uint64_t id) = 0;
virtual AioResultList submit(RGWSI_RADOS::Obj& obj,
librados::ObjectWriteOperation *op,
uint64_t cost, uint64_t id) = 0;
// poll for any ready completions without waiting
virtual AioResultList poll() = 0;
// return any ready completions. if there are none, wait for the next
virtual AioResultList wait() = 0;
// wait for all outstanding completions and return their results
virtual AioResultList drain() = 0;
};
} // namespace rgw
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