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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
/*
* 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.
*
*/
#include <type_traits>
#include "include/rados/librados.hpp"
#include "librados/librados_asio.h"
#include "rgw_aio.h"
#include "rgw_d3n_cacherequest.h"
#include "rgw_cache_driver.h"
namespace rgw {
namespace {
void cb(librados::completion_t, void* arg);
struct state {
Aio* aio;
librados::IoCtx ctx;
librados::AioCompletion* c;
state(Aio* aio, librados::IoCtx ctx, AioResult& r)
: aio(aio), ctx(std::move(ctx)),
// coverity[ctor_dtor_leak:SUPPRESS]
c(librados::Rados::aio_create_completion(&r, &cb)) {}
};
void cb(librados::completion_t, void* arg) {
static_assert(sizeof(AioResult::user_data) >= sizeof(state));
auto& r = *(static_cast<AioResult*>(arg));
auto s = reinterpret_cast<state*>(&r.user_data);
r.result = s->c->get_return_value();
s->c->release();
Aio* aio = s->aio;
// manually destroy the state that was constructed with placement new
s->~state();
aio->put(r);
}
template <typename Op>
Aio::OpFunc aio_abstract(librados::IoCtx ctx, Op&& op, jspan_context* trace_ctx = nullptr) {
return [ctx = std::move(ctx), op = std::move(op), trace_ctx] (Aio* aio, AioResult& r) mutable {
constexpr bool read = std::is_same_v<std::decay_t<Op>, librados::ObjectReadOperation>;
// use placement new to construct the rados state inside of user_data
auto s = new (&r.user_data) state(aio, ctx, r);
if constexpr (read) {
(void)trace_ctx; // suppress unused trace_ctx warning. until we will support the read op trace
r.result = ctx.aio_operate(r.obj.oid, s->c, &op, &r.data);
} else {
r.result = ctx.aio_operate(r.obj.oid, s->c, &op, 0, trace_ctx);
}
if (r.result < 0) {
// cb() won't be called, so release everything here
s->c->release();
aio->put(r);
s->~state();
}
};
}
struct Handler {
Aio* throttle = nullptr;
librados::IoCtx ctx;
AioResult& r;
// write callback
void operator()(boost::system::error_code ec) const {
r.result = -ec.value();
throttle->put(r);
}
// read callback
void operator()(boost::system::error_code ec, bufferlist bl) const {
r.result = -ec.value();
r.data = std::move(bl);
throttle->put(r);
}
};
template <typename Op>
Aio::OpFunc aio_abstract(librados::IoCtx ctx, Op&& op,
boost::asio::yield_context yield,
jspan_context* trace_ctx) {
return [ctx = std::move(ctx), op = std::move(op), yield, trace_ctx] (Aio* aio, AioResult& r) mutable {
// arrange for the completion Handler to run on the yield_context's strand
// executor so it can safely call back into Aio without locking
auto ex = yield.get_executor();
librados::async_operate(yield, ctx, r.obj.oid, &op, 0, trace_ctx,
bind_executor(ex, Handler{aio, ctx, r}));
};
}
Aio::OpFunc d3n_cache_aio_abstract(const DoutPrefixProvider *dpp, optional_yield y, off_t read_ofs, off_t read_len, std::string& cache_location) {
return [dpp, y, read_ofs, read_len, cache_location] (Aio* aio, AioResult& r) mutable {
// d3n data cache requires yield context (rgw_beast_enable_async=true)
ceph_assert(y);
auto c = std::make_unique<D3nL1CacheRequest>();
lsubdout(g_ceph_context, rgw_datacache, 20) << "D3nDataCache: d3n_cache_aio_abstract(): libaio Read From Cache, oid=" << r.obj.oid << dendl;
c->file_aio_read_abstract(dpp, y.get_yield_context(), cache_location, read_ofs, read_len, aio, r);
};
}
template <typename Op>
Aio::OpFunc aio_abstract(librados::IoCtx ctx, Op&& op, optional_yield y, jspan_context *trace_ctx = nullptr) {
static_assert(std::is_base_of_v<librados::ObjectOperation, std::decay_t<Op>>);
static_assert(!std::is_lvalue_reference_v<Op>);
static_assert(!std::is_const_v<Op>);
if (y) {
return aio_abstract(std::move(ctx), std::forward<Op>(op),
y.get_yield_context(), trace_ctx);
}
return aio_abstract(std::move(ctx), std::forward<Op>(op), trace_ctx);
}
} // anonymous namespace
Aio::OpFunc Aio::librados_op(librados::IoCtx ctx,
librados::ObjectReadOperation&& op,
optional_yield y) {
return aio_abstract(std::move(ctx), std::move(op), y);
}
Aio::OpFunc Aio::librados_op(librados::IoCtx ctx,
librados::ObjectWriteOperation&& op,
optional_yield y, jspan_context *trace_ctx) {
return aio_abstract(std::move(ctx), std::move(op), y, trace_ctx);
}
Aio::OpFunc Aio::d3n_cache_op(const DoutPrefixProvider *dpp, optional_yield y,
off_t read_ofs, off_t read_len, std::string& cache_location) {
return d3n_cache_aio_abstract(dpp, y, read_ofs, read_len, cache_location);
}
} // namespace rgw
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