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Re: [xfstests PATCH v3 2/5] ext4: allow ext4 to use $SCRATCH_LOGDEV

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On Wed, May 31, 2017 at 09:08:17AM -0400, Jeff Layton wrote:
> The writeback error handling test requires that you put the journal on a
> separate device. This allows us to use dmerror to simulate data
> writeback failure, without affecting the journal.
> 
> xfs already has infrastructure for this (a'la $SCRATCH_LOGDEV), so wire
> up the ext4 code so that it can do the same thing when _scratch_mkfs is
> called.
> 
> Signed-off-by: Jeff Layton <jlayton@redhat.com>
> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  common/rc | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/common/rc b/common/rc
> index 743df427c047..391d36f373cd 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -676,6 +676,9 @@ _scratch_mkfs_ext4()
>  	local tmp=`mktemp`
>  	local mkfs_status
>  
> +	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
> +	    $mkfs_cmd -O journal_dev $SCRATCH_LOGDEV && \
> +	    mkfs_cmd="$mkfs_cmd -J device=$SCRATCH_LOGDEV"

Need $MKFS_OPTIONS too when creating journal device, otherwise mkfs will
fail when making non-default block size ext4, i.e. journal device has 4k
block size, but ext4 has 1k block size if we have MKFS_OPTIONS="-b 1024"

Thanks,
Eryu

>  
>  	_scratch_do_mkfs "$mkfs_cmd" "$mkfs_filter" $* 2>$tmp.mkfserr 1>$tmp.mkfsstd
>  	mkfs_status=$?
> -- 
> 2.9.4
> 
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[xfstests PATCH v3 0/5] add a test for reporting writeback errors across all fds on fsync Jeff Layton <jlayton@redhat.com> - 2017-05-31 15:10 +0200
  [xfstests PATCH v3 2/5] ext4: allow ext4 to use $SCRATCH_LOGDEV Jeff Layton <jlayton@redhat.com> - 2017-05-31 15:20 +0200
    Re: [xfstests PATCH v3 2/5] ext4: allow ext4 to use $SCRATCH_LOGDEV Eryu Guan <eguan@redhat.com> - 2017-06-06 11:10 +0200

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