/* libdiskfs implementation of fs.defs: file_syncfs
   Copyright (C) 1992, 1993, 1994, 1995, 1996 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 "priv.h"
#include "fs_S.h"
#include <hurd/fsys.h>

/* Implement file_syncfs as described in <hurd/fs.defs>. */
kern_return_t
diskfs_S_file_syncfs (struct protid *cred,
		      int wait,
		      int dochildren)
{
  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))
	  {
	    fsys_syncfs (control, wait, 1);
	    mach_port_deallocate (mach_task_self (), control);
	  }
	pthread_mutex_lock (&np->lock);
	return 0;
      }
  
  if (!cred)
    return EOPNOTSUPP;

  if (dochildren)
    diskfs_node_iterate (helper);

  if (diskfs_synchronous)
    wait = 1;

  if (! diskfs_readonly)
    {
      diskfs_sync_everything (wait);
      diskfs_set_hypermetadata (wait, 0);
    }

  return 0;
}