On Tue, Nov 19, 2013 at 07:51:22PM +0800, Zheng Liu wrote:
> On Tue, Nov 19, 2013 at 03:18:26AM -0800, Christoph Hellwig wrote:
> > On Tue, Nov 19, 2013 at 07:19:47PM +0800, Zheng Liu wrote:
> > > Yes, I know that XFS has a shared/exclusive lock. I guess that is why
> > > it can pass the test. But another question is why xfs fails when we do
> > > some append dio writes with doing buffered read.
> >
> > Can you provide a test case for that issue?
>
> Simple. Reader just need to open this file without O_DIRECT flag. I
> paste the full code snippet below. Please take care of this line:
> readfd = open(argv[1], /*O_DIRECT|*/O_RDONLY, S_IRWXU);
>
> The result of this program on my own sand box looks like below:
> encounter an error: offset 0
....
> if (ret >= 0) {
> for (j = 0; j < ret; j++) {
> if (rbuf[i] != 'a') {
> fprintf(stderr, "encounter an error: offset %ld\n",
> i);
> goto err;
Should be checking rbuf[j], perhaps?
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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