Re: [PATCH v3 05/13] generic/1226: Add atomic write test using fio crc check verifier

[John Garry]

On 17/07/2025 14:52, Ojaswin Mujoo wrote:
> On Thu, Jul 17, 2025 at 02:00:18PM +0100, John Garry wrote:
> > On 12/07/2025 15:12, Ojaswin Mujoo wrote:
> > > From: "Ritesh Harjani (IBM)" <ritesh.list@xxxxxxxxx>
> > >
> > > This adds atomic write test using fio based on it's crc check verifier.
> > > fio adds a crc for each data block. If the underlying device supports atomic
> > > write then it is guaranteed that we will never have a mix data from two
> > > threads writing on the same physical block.
> >
> > I think that you should mention that 2-phase approach.
>
> Sure I can add a comment and update the commit message with this.
>
> > Is there something which ensures that we have fio which supports RWF_ATOMIC?
> > fio for some time supported the "atomic" cmdline param, but did not do
> > anything until recently
>
> We do have _require_fio which ensures the options passed are supported
> by the current fio. If you are saying some versions of fio have --atomic
> valid but dont do an RWF_ATOMIC then I'm not really sure if that can be
> caught though.

Can you check the fio version?

> > > Co-developed-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
> > > Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
> > > Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
> > > ---
> > >    tests/generic/1226     | 101 +++++++++++++++++++++++++++++++++++++++++
> > >    tests/generic/1226.out |   2 +
> >
> > Was this tested with xfs?
>
> Yes, I've tested with XFS with software fallback as well. Also, tested
> xfs while keeping io size as 16kb so we stress the hw paths too.

so is that requirement implemented with the 
_require_scratch_write_atomic check?

> Both
> seem to be passing as expected.
> >