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

content/browser/indexed_db/leveldb/leveldb_database.cc

 // Copyright (c) 2013 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 "content/browser/indexed_db/leveldb/leveldb_database.h"
 
 #include <inttypes.h>
 #include <stdint.h>
 
 #include <cerrno>
@@ skipping 108 matching lines @@
     leveldb::DB** db,
     std::unique_ptr<const leveldb::FilterPolicy>* filter_policy) {
   filter_policy->reset(leveldb::NewBloomFilterPolicy(10));
   leveldb::Options options;
   options.comparator = comparator;
   options.create_if_missing = true;
   options.paranoid_checks = true;
   options.filter_policy = filter_policy->get();
   options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
   options.compression = leveldb::kSnappyCompression;
+  options.write_buffer_size = leveldb_env::WriteBufferSize(path);

[michaeln, 2016/08/16 19:41:22]

or maybe only expose the xxxForDiskSize() function in env.h and call
base::SysInfo::AmountOfTotalDiskSpace(path) here at the callsite

 
   // For info about the troubles we've run into with this parameter, see:
   // https://code.google.com/p/chromium/issues/detail?id=227313#c11
   options.max_open_files = 80;
   options.env = env;
 
   // ChromiumEnv assumes UTF8, converts back to FilePath before using.
   leveldb::Status s = leveldb::DB::Open(options, path.AsUTF8Unsafe(), db);
 
   return s;
@@ skipping 329 matching lines @@
   dump->AddString("file_name", "", file_name_for_tracing);
 
   // Memory is allocated from system allocator (malloc).
   pmd->AddSuballocation(dump->guid(),
                         base::trace_event::MemoryDumpManager::GetInstance()
                             ->system_allocator_pool_name());
   return true;
 }
 
 }  // namespace content