linux-ext4 - Re: [PATCH] common/rc: Modify _require_batched

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Date:   Mon, 9 May 2022 11:52:42 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     fstests@...r.kernel.org
Cc:     riteshh@...ux.ibm.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] common/rc: Modify _require_batched_discard to improve
 test coverage

Greetings,

Please do let me know if there are any reviews or comments on this patch.

Thank you,
Ojaswin

On Fri, Apr 01, 2022 at 11:27:13AM +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 on filesystems like ext4.
> 
> This case was not correctly handle by "_require_batched_discard" as
> it incorrectly interpreted the FITRIM failure as fs not supporting
> the IOCTL. This caused the tests like generic/260 to incorectly
> 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>
> ---
>  common/rc | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/common/rc b/common/rc
> index e2d3d72a..97386342 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -3858,7 +3858,13 @@ _require_batched_discard()
>  		exit 1
>  	fi
>  	_require_fstrim
> -	$FSTRIM_PROG $1 > /dev/null 2>&1 || _notrun "FITRIM not supported on $1"
> +
> +	$FSTRIM_PROG $1 2>&1 | grep -q "not supported"
> +	RET=$?
> +	if [ "$RET" = "0" ]
> +	then
> +		_notrun "FITRIM not supported on $1"
> +	fi
>  }
>  
>  _require_dumpe2fs()
> -- 
> 2.27.0
>