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+#!/usr/bin/guile -s
+!#
+
+;;; Copyright (C) 2007 Z RESEARCH Inc. <http://www.zresearch.com>
+;;;
+;;; This program is free software; you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 2 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program; if not, write to the Free Software
+;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+;;;
+
+;;; This script lets you specify the xlator graph as a Scheme list
+;;; and provides a function to generate the spec file for the graph.
+
+
+(define (volume args)
+ (apply
+ (lambda (name type options)
+ (lambda args
+ (display "volume ") (display name) (newline)
+ (display " type ") (display type) (newline)
+ (map (lambda (key-value-cons)
+ (let ((key (car key-value-cons))
+ (value (cdr key-value-cons)))
+ (display " option ") (display key) (display " ")
+ (display value) (newline)))
+ options)
+ (if (> (length args) 0)
+ (begin
+ (display " subvolumes ")
+ (map (lambda (subvol)
+ (display subvol) (display " "))
+ args)
+ (newline)))
+ (display "end-volume") (newline) (newline)
+ name))
+ args))
+
+;; define volumes with names/type/options and bind to a symbol
+;; relate them seperately (see below)
+;; more convinient to seperate volume definition and relation
+
+(define wb (volume '(wb0
+ performance/write-behind
+ ((aggregate-size . 0)
+ (flush-behind . off)
+ ))))
+
+(define ra (volume '(ra0
+ performance/read-ahead
+ ((page-size . 128KB)
+ (page-count . 1)
+ ))))
+
+(define ioc (volume '(ioc0
+ performance/io-cache
+ ((page-size . 128KB)
+ (cache-size . 64MB)
+ ))))
+
+(define iot (volume '(iot0
+ performance/io-threads
+ ()
+ )))
+
+(define client1 (volume '(client1
+ protocol/client
+ ((transport-type . tcp/client)
+ (remote-host . localhost)
+ (remote-subvolume . brick1)
+ ))))
+
+(define client2 (volume '(client2
+ protocol/client
+ ((transport-type . tcp/client)
+ (remote-host . localhost)
+ (remote-subvolume . brick2)
+ ))))
+
+(define unify (volume '(unify0
+ cluster/unify
+ ((scheduler . rr)
+ ))))
+
+;; relate the symbols to output a spec file
+;; note: relating with symbols lets you change volume name in one place
+
+(wb (ra (ioc (iot (unify (client1)
+ (client2))))))