/* 
   Copyright (C) 1999 Free Software Foundation
   Written by Thomas Bushnell, BSG.

   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 "netfs.h"
#include "io_S.h"

/* Implement io_revoke as described in <hurd/io.defs>. */
kern_return_t
netfs_S_io_revoke (struct protid *cred)
{
  error_t err;
  struct node *np;

  error_t 
    iterator_function (void *port)
    {
      struct protid *user = port;
      
      if ((user != cred) && (user->po->np == np))
	ports_destroy_right (user);
    }

  if (!cred)
    return EOPNOTSUPP;
  
  np = cred->po->np;

  mutex_lock (&np->lock);
  
  err = netfs_validate_stat (np, cred);
  if (!err)
    err = fshelp_isowner (&np->dn_stat, cred->user);
  if (err)
    {
      mutex_unlock (&np->lock);
      return err;
    }
  
  ports_bucket_iterate (diskfs_port_bucket, iterator_function);

  mutex_unlock (&np->lock);

  return 0;
}