linux-kernel - Re: [PATCH v3] common/rc: Modify _require_batched

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Date:   Wed, 15 Jun 2022 17:56:07 +0800
From:   Zorro Lang <zlang@...nel.org>
To:     Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Cc:     fstests@...r.kernel.org, zlang@...hat.com, riteshh@...ux.ibm.com,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] common/rc: Modify _require_batched_discard to improve
 test coverage

On Mon, Jun 13, 2022 at 02:05:34PM +0530, Ojaswin Mujoo wrote:
> Greetings,
> 
> Please let me know if there are any reviews/suggestions on this
> patch.

This patch has been merged in fstests v2022.05.22, as below

  ee264b3f common/rc: Modify _require_batched_discard to improve test coverage

Is there anything wrong with that?

Thanks,
Zorro

> 
> Thank you!
> 
> On Mon, May 16, 2022 at 02:15:05PM +0530, Ojaswin Mujoo wrote:
> > A recent ext4 patch discussed [1] that some devices (eg LVMs) can
> > have a discard granularity as big as 42MB which makes it larger
> > than the group size of ext4 FS with 1k BS.  This causes the FITRIM
> > IOCTL to fail.
> > 
> > This case was not correctly handled by this test since
> > "_require_batched_discard" incorrectly interpreted the FITRIM
> > failure as SCRATCH_DEV not supporting the IOCTL. This caused the test
> > to report "not run" instead of "failed" in case of large discard granularity.
> > 
> > Fix "_require_batched_discard" to use a more accurate method
> > to determine if discard is supported.
> > 
> > [1] commit 173b6e383d2
> >     ext4: avoid trim error on fs with small groups
> > 
> > Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
> > Reviewed-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> > ---
> > 
> > Changes since v2 [1] 
> > 
> > *  Eliminated redundant $ret variable
> > 
> > [1]
> > https://lore.kernel.org/all/20220516063951.87838-1-ojaswin@linux.ibm.com/
>