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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu system mapped-devices)
+ #:use-module (guix records)
+ #:export (mapped-device
+ mapped-device?
+ mapped-device-source
+ mapped-device-target
+ mapped-device-type
+
+ mapped-device-kind
+ mapped-device-kind?
+ mapped-device-kind-open
+ mapped-device-kind-close))
+
+;;; Commentary:
+;;;
+;;; This module supports "device mapping", a concept implemented by Linux's
+;;; device-mapper.
+;;;
+;;; Code:
+
+(define-record-type* <mapped-device> mapped-device
+ make-mapped-device
+ mapped-device?
+ (source mapped-device-source) ;string
+ (target mapped-device-target) ;string
+ (type mapped-device-type)) ;<mapped-device-kind>
+
+(define-record-type* <mapped-device-type> mapped-device-kind
+ make-mapped-device-kind
+ mapped-device-kind?
+ (open mapped-device-kind-open) ;source target -> gexp
+ (close mapped-device-kind-close ;source target -> gexp
+ (default (const #~(const #f)))))
+
+;;; mapped-devices.scm ends here