Re: [PATCH 9/8] common/populate: remember multi-device configurations

[Eryu Guan <eguan@redhat.com>]

On Wed, Jun 21, 2017 at 11:26:53PM -0700, Darrick J. Wong wrote:
> Record the external log and realtime device configurations when we
> create a sample filesystem.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  common/populate |   10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/common/populate b/common/populate
> index e99ce68..b59ed02 100644
> --- a/common/populate
> +++ b/common/populate
> @@ -713,7 +713,15 @@ _scratch_populate_cached() {
>  	rm -rf "$(find "${POPULATE_METADUMP}" -mtime +2 2>/dev/null)"
>  
>  	# Throw away cached image if it doesn't match our spec.
> -	meta_descr="FSTYP ${FSTYP} MKFS_OPTIONS ${MKFS_OPTIONS} SIZE $(blockdev --getsz "${SCRATCH_DEV}") ARGS $@"
> +	case "${FSTYP}" in
> +	"ext4")
> +		extra_descr="LOGDEV ${SCRATCH_LOGDEV} USE_EXTERNAL ${USE_EXTERNAL}";;
> +	"xfs")
> +		extra_descr="LOGDEV ${SCRATCH_LOGDEV} USE_EXTERNAL ${USE_EXTERNAL} RTDEV ${SCRATCH_RTDEV}";;
> +	*)
> +		extra_descr="";;
> +	esac
> +	meta_descr="FSTYP ${FSTYP} MKFS_OPTIONS ${MKFS_OPTIONS} SIZE $(blockdev --getsz "${SCRATCH_DEV}") ${extra_descr} ARGS $@"

This works fine if "test without external log" then "test with external
log" or vise-versa. But I just found that a second run with external log
still cause scratch dev fail to mount. Seems it's because e2image
doesn't take the external log dev into account when save/restore fs
image, then mounting scratch dev failed with

[184952.642892] EXT4-fs (sdc2): journal UUID does not match

Thanks,
Eryu

>  	cmp -s "${POPULATE_METADUMP_DESCR}" <(echo "${meta_descr}") || rm -rf "${POPULATE_METADUMP}"
>  
>  	# Do we have a cached image?