Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/src/rgw/rgw_aio.h b/src/rgw/rgw_aio.h
new file mode 100644
index 00000000..0ca401da
--- /dev/null
+++ b/src/rgw/rgw_aio.h
@@ -0,0 +1,80 @@
+// -*- 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