Re: [PATCH v4 08/18] tools/testing/nvdimm: add 'bio_delay' mechanism

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On Tue, Jan 2, 2018 at 1:44 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
> On Sat, Dec 23, 2017 at 04:56:43PM -0800, Dan Williams wrote:
>> In support of testing truncate colliding with dma add a mechanism that
>> delays the completion of block I/O requests by a programmable number of
>> seconds. This allows a truncate operation to be issued while page
>> references are held for direct-I/O.
>>
>> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
>
> Why not put this in the generic bio layer code and then write a
> generic fstest to exercise this truncate vs direct IO completion
> race condition on all types of storage and filesystems?
>
> i.e. if it sits in a nvdimm test suite, it's never going to be run
> by filesystem developers....

I do want to get it into xfstests eventually. I picked the nvdimm
infrastructure for expediency of getting the fix developed. Also, I
consider the collision in the non-dax case a solved problem since the
core mm will keep the page out of circulation indefinitely.



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