path_parentat    2379 fs/namei.c     	retval = path_parentat(&nd, flags | LOOKUP_RCU, parent);
path_parentat    2381 fs/namei.c     		retval = path_parentat(&nd, flags, parent);
path_parentat    2383 fs/namei.c     		retval = path_parentat(&nd, flags | LOOKUP_REVAL, parent);