1 files changed, 16 insertions, 1 deletions
diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index 4441c7578..4100d9cca 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -1083,9 +1083,10 @@ BlockchainLMDB::BlockchainLMDB(bool batch_transactions)
   m_hardfork = nullptr;
 }
 
-void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
+void BlockchainLMDB::open(const std::string& filename, const int db_flags)
 {
   int result;
+  int mdb_flags = MDB_NORDAHEAD;
 
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
 
@@ -1124,6 +1125,15 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
 
   size_t mapsize = DEFAULT_MAPSIZE;
 
+  if (db_flags & DBF_FAST)
+    mdb_flags |= MDB_NOSYNC;
+  if (db_flags & DBF_FASTEST)
+    mdb_flags |= MDB_NOSYNC | MDB_WRITEMAP | MDB_MAPASYNC;
+  if (db_flags & DBF_RDONLY)
+    mdb_flags = MDB_RDONLY;
+  if (db_flags & DBF_SALVAGE)
+    mdb_flags |= MDB_PREVSNAPSHOT;
+
   if (auto result = mdb_env_open(m_env, filename.c_str(), mdb_flags, 0644))
     throw0(DB_ERROR(lmdb_error("Failed to open lmdb environment: ", result).c_str()));
 
@@ -1308,6 +1318,11 @@ void BlockchainLMDB::sync()
   }
 }
 
+void BlockchainLMDB::safesyncmode(const bool onoff)
+{
+  mdb_env_set_flags(m_env, MDB_NOSYNC|MDB_MAPASYNC, !onoff);
+}
+
 void BlockchainLMDB::reset()
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);