leveldb: Reuse manifest (AKA logs) during open.

chrome/browser/prefs/leveldb_pref_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 "chrome/browser/prefs/leveldb_pref_store.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/location.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/sequenced_task_runner.h"
 #include "base/task_runner_util.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "base/values.h"
+#include "third_party/leveldatabase/env_chromium.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
 
 namespace {
 
 enum ErrorMasks {
   OPENED = 1 << 0,
   DESTROYED = 1 << 1,
   REPAIRED = 1 << 2,
   DESTROY_FAILED = 1 << 3,
@@ skipping 71 matching lines @@
   }
   return true;
 }
 
 /* static */
 void LevelDBPrefStore::OpenDB(const base::FilePath& path,
                               ReadingResults* reading_results) {
   DCHECK_EQ(0, reading_results->error);
   leveldb::Options options;
   options.create_if_missing = true;
+  options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
   leveldb::DB* db;
   while (1) {
     leveldb::Status status =
         leveldb::DB::Open(options, path.AsUTF8Unsafe(), &db);
     if (status.ok()) {
       reading_results->db.reset(db);
       reading_results->error |= OPENED;
       break;
     }
     if (status.IsIOError()) {
@@ skipping 290 matching lines @@
   }
 
   // TODO(dgrogan): Call pref_filter_->FilterOnLoad
 
   if (error_delegate_.get() && read_error_ != PREF_READ_ERROR_NONE)
     error_delegate_->OnError(read_error_);
 
   FOR_EACH_OBSERVER(
       PrefStore::Observer, observers_, OnInitializationCompleted(true));
 }