MDB_FL_READBACK
MDB_FL_READBACK;
int rdback = mdb.m_flags & MDB_FL_READBACK;
int rdback = mdb.m_flags & MDB_FL_READBACK;
{ "write_readback", opt_set_mflags, MDB_FL_READBACK },
if (mdb.m_flags & MDB_FL_READBACK)