leveldb: Reuse manifest (AKA logs) during open.

extensions/browser/value_store/leveldb_value_store.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/value_store/leveldb_value_store.h"
 
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/value_store/value_store_util.h"
+#include "third_party/leveldatabase/env_chromium.h"
 #include "third_party/leveldatabase/src/include/leveldb/iterator.h"
 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
 
 namespace util = value_store_util;
 using content::BrowserThread;
 
 namespace {
 
 const char kInvalidJson[] = "Invalid JSON";
 const char kCannotSerialize[] = "Cannot serialize value to JSON";
@@ skipping 295 matching lines @@
 
 scoped_ptr<ValueStore::Error> LeveldbValueStore::EnsureDbIsOpen() {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
 
   if (db_)
     return util::NoError();
 
   leveldb::Options options;
   options.max_open_files = 0;  // Use minimum.
   options.create_if_missing = true;
+  options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
 
   leveldb::DB* db = NULL;
   leveldb::Status status =
       leveldb::DB::Open(options, db_path_.AsUTF8Unsafe(), &db);
   if (!status.ok())
     return ToValueStoreError(status, util::NoKey());
 
   CHECK(db);
   db_.reset(db);
   return util::NoError();
@@ skipping 92 matching lines @@
   CHECK(!status.ok());
   CHECK(!status.IsNotFound());  // not an error
 
   std::string message = status.ToString();
   // The message may contain |db_path_|, which may be considered sensitive
   // data, and those strings are passed to the extension, so strip it out.
   ReplaceSubstringsAfterOffset(&message, 0u, db_path_.AsUTF8Unsafe(), "...");
 
   return Error::Create(CORRUPTION, message, key.Pass());
 }