/* libdiskfs implementation of fs.defs: file_getlinknode
   Copyright (C) 1992, 1993, 1994 Free Software Foundation

   This program 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.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <errno.h>

#include "diskfs.h"
#include <hurd/hurd_types.h>
#include <hurd/ports.h>
#include <mach.h>
#include "fs_S.h"

/* Implement file_getlinknode as described in <hurd/fs.defs>. */
kern_return_t
diskfs_S_file_getlinknode (struct protid *cred,
			   file_t *port,
			   mach_msg_type_name_t *portpoly)
{
  struct node *np;

  if (!cred)
    return EOPNOTSUPP;
  
  np = cred->po->np;
  if (np == diskfs_root_node)
    return EBUSY;
  
  *port = ports_get_right (cred);
  *portpoly = MACH_MSG_TYPE_MAKE_SEND;
  return 0;
}
