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/lib/partman/mount.d/70jfs is in ubiquity 2.18.7.

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#!/bin/sh

set -- $1

fs=$1
mp=$2
type=$3
options=$4
dump=$5
pass=$6

case $type in
    jfs)
	mount -t jfs ${options:+-o "$options"} $fs /target$mp || exit 1
	echo "umount /target$mp"
	exit 0
	;;
esac

exit 1