/*
   Copyright (C) 1993,94,95,96,98,99,2001 Free Software Foundation, Inc.

This file is part of the GNU Hurd.

The GNU Hurd 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.

The GNU Hurd 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 the GNU Hurd; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Written by Michael I. Bushnell.  */

#include "priv.h"
#include <errno.h>
#include <sys/stat.h>
#include <hurd/fsys.h>
#include <hurd/fshelp.h>
#include <pthread.h>

/* Shutdown the filesystem; flags are as for fsys_goaway. */
error_t
netfs_shutdown (int flags)
{
  error_t
  helper (struct node *node)
    {
      error_t err;
      mach_port_t control;

      err = fshelp_fetch_control (&node->transbox, &control);
      if (!err && (control != MACH_PORT_NULL))
        {
          pthread_mutex_unlock (&node->lock);
          err = fsys_goaway (control, flags);
          mach_port_deallocate (mach_task_self (), control);
          pthread_mutex_lock (&node->lock);
        }
      else
        err = 0;

      if ((err == MIG_SERVER_DIED) || (err == MACH_SEND_INVALID_DEST))
        err = 0;

      return err;
    }

  int nports;
  int err;

  if ((flags & FSYS_GOAWAY_UNLINK)
      && S_ISDIR (netfs_root_node->nn_stat.st_mode))
    return EBUSY;

#ifdef NOTYET
  if (flags & FSYS_GOAWAY_RECURSE)
    {
      err = netfs_node_iterate (helper);
      if (err)
	return err;
    }
#endif

#ifdef NOTYET
  pthread_rwlock_wrlock (&netfs_fsys_lock);
#endif

  /* Permit all current RPC's to finish, and then suspend any new ones.  */
  err = ports_inhibit_class_rpcs (netfs_protid_class);
  if (err)
    {
#ifdef  NOTYET
      pthread_rwlock_unlock (&netfs_fsys_lock);
#endif
      return err;
    }

  nports = ports_count_class (netfs_protid_class);
  if (((flags & FSYS_GOAWAY_FORCE) == 0) && nports)
    /* There are outstanding user ports; resume operations. */
    {
      ports_enable_class (netfs_protid_class);
      ports_resume_class_rpcs (netfs_protid_class);
#ifdef NOTYET
      pthread_rwlock_unlock (&netfs_fsys_lock);
#endif
      return EBUSY;
    }

  if (!(flags & FSYS_GOAWAY_NOSYNC))
    {
      err = netfs_attempt_syncfs (0, flags);
      if (err)
        return err;
    }

  return 0;
}