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-rw-r--r--libdiskfs/diskfs.h8
1 files changed, 7 insertions, 1 deletions
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 */