IndexedDB: Limit the size of a leveldb write buffer to minimize disk space.

third_party/leveldatabase/env_chromium.h

 // Copyright (c) 2013 The LevelDB Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #ifndef THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
 #define THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
 
 #include <deque>
 #include <set>
 #include <string>
@@ skipping 79 matching lines @@
 };
 
 ErrorParsingResult ParseMethodAndError(const leveldb::Status& status,
                                        MethodID* method,
                                        base::File::Error* error);
 int GetCorruptionCode(const leveldb::Status& status);
 int GetNumCorruptionCodes();
 std::string GetCorruptionMessage(const leveldb::Status& status);
 bool IndicatesDiskFull(const leveldb::Status& status);
 
+// Determine the appropriate leveldb write buffer size to use. The default size
+// (4MB) may result in a log file too large to be compacted given the available
+// storage space. This function will return smaller values for smaller disks,
+// and the default leveldb value for larger disks.
+//
+// |disk_space| is the logical partition size (in bytes), and *not* available
+// space. A value of -1 will return leveldb's default write buffer size.
+extern size_t WriteBufferSize(int64_t disk_space);
+
 class UMALogger {
  public:
   virtual void RecordErrorAt(MethodID method) const = 0;
   virtual void RecordOSError(MethodID method,
                              base::File::Error error) const = 0;
 };
 
 class RetrierProvider {
  public:
   virtual int MaxRetryTimeMillis() const = 0;
@@ skipping 104 matching lines @@
     void (*function)(void*);
   };
   typedef std::deque<BGItem> BGQueue;
   BGQueue queue_;
   LockTable locks_;
 };
 
 }  // namespace leveldb_env
 
 #endif  // THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_