libnetfs: add fsys_get_source

Add a user overridable function netfs_get_source with a default
implementation returning EOPNOTSUPP. Add a server function for
fsys-get-source.

* libnetfs/Makefile: Add fsys-get-source.c and get-source.c
* libnetfs/netfs.h: Add netfs_get_source.
* libnetfs/fsys-get-source.c: New file.
* libnetfs/get-source.c: Likewise.

1 files changed, 34 insertions, 0 deletions

diff --git a/libnetfs/fsys-get-source.c b/libnetfs/fsys-get-source.c
new file mode 100644
index 00000000..6143d10b
--- /dev/null
+++ b/libnetfs/fsys-get-source.c
@@ -0,0 +1,34 @@
+/* fsys_get_source
+
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+   Written by Justus Winter <4winter@informatik.uni-hamburg.de>
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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, or (at your option)
+   any later version.
+
+   The GNU Hurd 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 the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "priv.h"
+#include "fsys_S.h"
+
+/* Return information about the source of the receiving
+   filesystem.  */
+error_t
+netfs_S_fsys_get_source (fsys_t server,
+			 mach_port_t reply,
+			 mach_msg_type_name_t replyPoly,
+			 char *source)
+{
+  return netfs_get_source (source);
+}