/*
   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 <hurd/fsys.h>

/* Shutdown the filesystem; flags are as for fsys_goaway. */
error_t
diskfs_shutdown (int flags)
{
  int nports = -1;
  int err;

  error_t
    helper (struct node *np)
      {
	error_t error;
	mach_port_t control;

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

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

	return error;
      }

  if ((flags & FSYS_GOAWAY_UNLINK)
       && S_ISDIR (diskfs_root_node->dn_stat.st_mode))
    return EBUSY;

  if (flags & FSYS_GOAWAY_RECURSE)
    {
      err = diskfs_node_iterate (helper);
      if (err)
	return err;
    }

  pthread_rwlock_wrlock (&diskfs_fsys_lock);

  /* Permit all the current RPC's to finish, and then
     suspend new ones.  */
  err = ports_inhibit_class_rpcs (diskfs_protid_class);
  if (err)
    {
      pthread_rwlock_unlock (&diskfs_fsys_lock);
      return err;
    }

  /* Write everything out and set "clean" state.  Even if we don't in fact
     shut down now, this has the nice effect that a disk that has not been
     written for a long time will not need checking after a crash.  */
  diskfs_sync_everything (1);
  diskfs_set_hypermetadata (1, 1);
  _diskfs_diskdirty = 0;

  /* First, see if there are outstanding user ports. */
  nports = ports_count_class (diskfs_protid_class);
  if (((flags & FSYS_GOAWAY_FORCE) == 0)
      && (nports || diskfs_pager_users ()))
    {
      ports_enable_class (diskfs_protid_class);
      ports_resume_class_rpcs (diskfs_protid_class);
      pthread_rwlock_unlock (&diskfs_fsys_lock);
      return EBUSY;
    }

  if (!diskfs_readonly && (flags & FSYS_GOAWAY_NOSYNC) == 0)
    {
      diskfs_shutdown_pager ();
      diskfs_set_hypermetadata (1, 1);
    }

  return 0;
}