linux-ext4 - Re: [PATCH RFC 2/2] xfstests: common/rc: add cluster size support for ext4

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Date:   Mon, 27 Apr 2020 10:33:54 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        joseph.qi@...ux.alibaba.com
Subject: Re: [PATCH RFC 2/2] xfstests: common/rc: add cluster size support
 for ext4

On Fri, Apr 24, 2020 at 05:33:50PM +0800, Jeffle Xu wrote:
> Inserting and collapsing range on ext4 with 'bigalloc' feature will
> fail due to the offset and size should be alligned with the cluster
> size.
> 
> The previous patch has add support for cluster size in fsx. Detect and
> pass the cluster size parameter to fsx if the underlying filesystem
> is ext4 with bigalloc.
> 
> Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
> ---
>  common/rc | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/common/rc b/common/rc
> index 2000bd9..71dde5f 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -3908,6 +3908,15 @@ run_fsx()
>  {
>  	echo fsx $@
>  	local args=`echo $@ | sed -e "s/ BSIZE / $bsize /g" -e "s/ PSIZE / $psize /g"`
> +
> +	if [ "$FSTYP" == "ext4" ]; then
> +		local cluster_size=$(tune2fs -l $TEST_DEV | grep 'Cluster size' | awk '{print $3}')
> +		if [ -n $cluster_size ]; then
> +			echo "cluster size: $cluster_size"
> +			args="$args -u $cluster_size"
> +		fi
> +	fi

Computing the file allocation block size ought to be a separate helper.

I wonder if there's a standard way to report cluster sizes, seeing as
fat, ext4, ocfs2, and xfs can all have minimum space allocation units
that are larger than the base fs block size.

--D

> +
>  	set -- $here/ltp/fsx $args $FSX_AVOID $TEST_DIR/junk
>  	echo "$@" >>$seqres.full
>  	rm -f $TEST_DIR/junk
> -- 
> 1.8.3.1
>