Function check_db_dir_existence

sql/sql_db.cc:2125–2152

bool check_db_dir_existence(const char *db_name)
{
  char db_dir_path[FN_REFLEN + 1];
  uint db_dir_path_len;

  if (dbname_cache->contains(db_name))
    return 0;

  db_dir_path_len= build_table_filename(db_dir_path, sizeof(db_dir_path) - 1,
                                        db_name, "", "", 0);

  if (db_dir_path_len && db_dir_path[db_dir_path_len - 1] == FN_LIBCHAR)
    db_dir_path[db_dir_path_len - 1]= 0;

  /*
    Check access.

    The locking is to prevent creating permanent stale
    entries for deleted databases, in case of
    race condition with my_rmdir.
  */
  mysql_rwlock_rdlock(&rmdir_lock);
  int ret= my_access(db_dir_path, F_OK);
  if (!ret)
    dbname_cache->insert(db_name);
  mysql_rwlock_unlock(&rmdir_lock);
  return ret;
}