Function flush_write_buffer_if_file_backed

sql/log.cc:2072–2084

Ensures that the input IO Cache is consistent with where its data is stored, i.e that the data is entirely either stored in-memory or backed by a temporary file. In actuality, it is simple: if the IO Cache is actively backed by a temporary file (i.e. the transaction or statement data is sufficiently large to exceed its respective binlog_cache_size), then ensure all data is flushed to the

  Returns TRUE on success, FALSE on error.
*/
inline my_bool flush_write_buffer_if_file_backed(IO_CACHE *info)
{
  my_bool ret= 0;
  DBUG_ENTER("binlog_flush_cache_log_to_disk");
  DBUG_ASSERT(info);
  DBUG_ASSERT(!info->error);
  DBUG_EXECUTE_IF("simulate_binlog_tmp_file_no_space_left_on_flush",
                  { DBUG_SET("+d,simulate_file_write_error"); });
  ret= info->pos_in_file && flush_io_cache(info);
  DBUG_EXECUTE_IF("simulate_binlog_tmp_file_no_space_left_on_flush",
                  { DBUG_SET("-d,simulate_file_write_error"); });
  DBUG_RETURN(ret);
}

/*
  This function flushes a cache upon commit/rollback.