n++;
                int size = chain.size();
                int cost = chain.getCreditCost();
                CommonServerMessageBlockRequest next = chain.getNext();
                if ( log.isTraceEnabled() ) {
                    log.trace(
                        String.format("%s costs %d avail %d (%s)", chain.getClass().getName(), cost, this.credits.availablePermits(), this.name));
                }

        catch ( CIFSException e ) {
            throw SmbException.wrap(e);
        }
    }


    /**
     * Returns the full URL of this SMB resource with '.' and '..' components
     * factored out. An <code>SmbFile</code> constructed with the result of
     * this method will result in an <code>SmbFile</code> that is equal to
     * the original.
     *
     * @return The canonicalized URL of this SMB resource.

        if ( type.isAssignableFrom(this.getClass()) ) {
            return (T) this;
        }
        throw new ClassCastException();
    }


    /**
     * @return session increased usage count
     */
    public SmbSessionImpl acquire () {
        long usage = this.usageCount.incrementAndGet();
        if ( log.isTraceEnabled() ) {
            log.trace("Acquire session " + usage + " " + this);
        }