* 
     */
    public void release () {
        long usage = this.usageCount.decrementAndGet();
        if ( log.isTraceEnabled() ) {
            log.trace("Release session " + usage + " " + this);
        }

        if ( usage == 0 ) {
            if ( log.isDebugEnabled() ) {
                log.debug("Usage dropped to zero, release connection " + this.transport);
            }
            synchronized ( this ) {

                if ( !parent.exists() ) {
                    if ( log.isDebugEnabled() ) {
                        log.debug("Parent does not exist " + p);
                    }
                    parent.mkdirs();
                }
            }
            catch ( SmbException e ) {
                if ( log.isDebugEnabled() ) {
                    log.debug("Failed to ensure parent exists " + p, e);
                }