From 3a5bcbcc94f01b1ef1ed0571b31434ed57162224 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 30 Jul 2013 11:59:20 +0200
Subject: 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.
---
 libnetfs/netfs.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'libnetfs/netfs.h')

diff --git a/libnetfs/netfs.h b/libnetfs/netfs.h
index 2b9454a9..e10ccae0 100644
--- a/libnetfs/netfs.h
+++ b/libnetfs/netfs.h
@@ -1,6 +1,6 @@
 /*
 
-   Copyright (C) 1994,95,96,97,99,2000,02 Free Software Foundation, Inc.
+   Copyright (C) 1994,95,96,97,99,2000,02,13 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
@@ -313,6 +313,12 @@ error_t netfs_file_get_storage_info (struct iouser *cred,
 				     mach_msg_type_number_t *num_offsets,
 				     char **data,
 				     mach_msg_type_number_t *data_len);
+
+/* The user may define this function.  The function must set source to
+   the source device of the filesystem. The function may return an
+   EOPNOTSUPP to indicate that the concept of a source device is not
+   applicable. The default function always returns EOPNOTSUPP. */
+error_t netfs_get_source (char *source);
 
 /* Option parsing */
 
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