update ceph source to reef 18.1.2

[ceph.git] / ceph / src / rocksdb / cache / secondary_cache.cc

diff --git a/ceph/src/rocksdb/cache/secondary_cache.cc b/ceph/src/rocksdb/cache/secondary_cache.cc
new file mode 100644 (file)
index 0000000..84352db
--- /dev/null
+++ b/ceph/src/rocksdb/cache/secondary_cache.cc
@@ -0,0 +1,32 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#include "rocksdb/secondary_cache.h"
+
+#include "cache/cache_entry_roles.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+namespace {
+
+size_t SliceSize(void* obj) { return static_cast<Slice*>(obj)->size(); }
+
+Status SliceSaveTo(void* from_obj, size_t from_offset, size_t length,
+                   void* out) {
+  const Slice& slice = *static_cast<Slice*>(from_obj);
+  std::memcpy(out, slice.data() + from_offset, length);
+  return Status::OK();
+}
+
+}  // namespace
+
+Status SecondaryCache::InsertSaved(const Slice& key, const Slice& saved) {
+  static Cache::CacheItemHelper helper{
+      &SliceSize, &SliceSaveTo, GetNoopDeleterForRole<CacheEntryRole::kMisc>()};
+  // NOTE: depends on Insert() being synchronous, not keeping pointer `&saved`
+  return Insert(key, const_cast<Slice*>(&saved), &helper);
+}
+
+}  // namespace ROCKSDB_NAMESPACE