Got it, thanks.
> On Jul 24, 2018, at 6:47 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
>
> On Mon, Jul 23, 2018 at 02:27:02PM +0000, Xu, Wen wrote:
>> Hi Brian,
>>
>> Yeah I tested it which is fixed in latest kernel. I just wonder if there is a specific patch
>> for this.
>
> The code was fixed as a result of committing the huge patch series
> that removed bufferheads from the XFS IO path. i.e. the bug went
> away because of other changes that addressed the root cause, not
> because we committed a change that specifically fixed the bug. Most
> likely it was this commit in the middle of the series to remove
> bufferhead dependencies in xfs_aops_discard_page() that solved the
> problem.
>
> e2ac836307e3 ("xfs: simplify xfs_bmap_punch_delalloc_range")
>
> -Dave.
>
> --
> Dave Chinner
> david@xxxxxxxxxxxxx
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