AFTERUSED=`df -P $DIR | tail -1 | awk '{ print $3 }'`
log "before $BEFOREUSED, after $AFTERUSED"
[ $AFTERUSED -gt $((BEFOREUSED + 20)) ] && \
AFTERUSED=`df -P $DIR | tail -1 | awk '{ print $3 }'`
log "before $BEFOREUSED, after $AFTERUSED"
[ $AFTERUSED -gt $((BEFOREUSED + 20)) ] && \