devs="$dev0 $dev1 $dev2"

set_up_test()
{
	mdadm -Cv -R -n 3 -l5 $md0 $devs --size=50M || die "create array failed"
	mdadm -a $md0 $dev3 || die "failed to bind new disk to array"
	echo 1000 > /sys/block/md0/md/sync_speed_max
}

clean_up_test()
{
	echo idle > /sys/block/md0/md/sync_action
	mdadm -S $md0
}

trap 'clean_up_test' EXIT

set_up_test || die "set up test failed"

# trigger reshape
mdadm --grow -l 6 $md0
sleep 1

# stop reshape
echo frozen > /sys/block/md0/md/sync_action

# read accross reshape
dd if=$md0 of=/dev/NULL bs=1m count=100 iflag=direct &> /dev/null &
sleep 2

# suspend array
echo 1 > /sys/block/md0/md/suspend_lo

exit 0