@SuppressWarnings("deprecation")
  protected static void checkPermissions(final FileSystem fs, final FileStatus stat,
      final EnumSet<FsAction> actions, String user) throws IOException,
      AccessControlException, HiveException {

    if (stat == null) {
      // File named by path doesn't exist; nothing to validate.
      return;
    }
    FsAction checkActions = FsAction.NONE;
    for (FsAction action : actions) {
      checkActions = checkActions.or(action);
    }
    try {
      FileUtils.checkFileAccessWithImpersonation(fs, stat, checkActions, user);
    } catch (Exception err) {
      // fs.permission.AccessControlException removed by HADOOP-11356, but Hive users on older
      // Hadoop versions may still see this exception .. have to reference by name.
      if (err.getClass().getName().equals("org.apache.hadoop.fs.permission.AccessControlException")) {
        throw accessControlException(err);
      }
      throw new HiveException(err);
    }
  }
Checks the permissions for the given path and current user on Hadoop FS. If the given path
does not exists, it returns.
ql/src/java/org/apache/hadoop/hive/ql/security/authorization/StorageBasedAuthorizationProvider.java