[Question] about async buffered reads feature

[Hao_Xu <haoxu@linux.alibaba.com>]

Hi Jens,
I'm doing tests about this feature: [PATCHSET RFC 0/11] Add support for 
async buffered reads
But currently with fio testing, I found the code doesn't go to the 
essential places in the function generic_file_buffered_read:

           if (iocb->ki_flags & IOCB_WAITQ) {
                   if (written) {
                           put_page(page);
                           goto out;
                   }
                   error = wait_on_page_locked_async(page,
                                                   iocb->ki_waitq);
           } else {

and

   page_not_up_to_date:
          /* Get exclusive access to the page ... */
          if (iocb->ki_flags & IOCB_WAITQ)
                  error = lock_page_async(page, iocb->ki_waitq);
          else


could you give me a copy of your test program which you mentioned in the 
RFC?
My testing environment:
fio version: 3.10
kernel version: the mainline kernel, latest commit is 
805c6d3c19210c90c109107d189744e960eae025


Thanks,
Hao