From 70b1ab5dbb8d7d1cf63ab170e0a96a03c6dd363c Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 30 Jul 2013 11:59:19 +0200
Subject: libdiskfs: add fsys_get_source

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

* libdiskfs/Makefile: Add fsys-get-source.c and get-source.c
* libdiskfs/diskfs.h: Add diskfs_get_source.
* libdiskfs/fsys-get-source.c: New file.
* libdiskfs/get-source.c: Likewise.
---
 libdiskfs/diskfs.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'libdiskfs/diskfs.h')

diff --git a/libdiskfs/diskfs.h b/libdiskfs/diskfs.h
index 24895172..22262aa8 100644
--- a/libdiskfs/diskfs.h
+++ b/libdiskfs/diskfs.h
@@ -1,7 +1,7 @@
 /* Definitions for fileserver helper functions
 
    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2007, 2008,
-   2009 Free Software Foundation, Inc.
+   2009, 2013 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
@@ -567,6 +567,12 @@ error_t (*diskfs_create_symlink_hook)(struct node *np, const char *target);
    isn't set, then the normal method (reading from the file data) is
    used.  If it returns any other error, it is returned to the user. */
 error_t (*diskfs_read_symlink_hook)(struct node *np, char *target);
+
+/* 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 diskfs_get_source (char *source);
 
 /* The library exports the following functions for general use */
 
-- 
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