/*
   Copyright (C) 1994,98,99,2001,02 Free Software Foundation, Inc.

   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 <assert.h>
#include <fcntl.h>
#include <string.h>

kern_return_t
trivfs_S_dir_lookup (struct trivfs_protid *cred,
		     mach_port_t reply, mach_msg_type_name_t reply_type,
		     char *filename,
		     int flags,
		     mode_t mode,
		     retry_type *retry_type,
		     char *retry_name,
		     mach_port_t *retrypt,
		     mach_msg_type_name_t *retrypt_type)
{
  int perms;
  error_t err;
  struct trivfs_protid *newcred;

  if (!cred)
    return EOPNOTSUPP;

  if (filename[0])
    return ENOTDIR;

  /* This is a null-pathname "reopen" call; do the right thing. */

  /* Burn off flags we don't actually implement */
  flags &= O_HURD;
  flags &= ~(O_CREAT|O_EXCL|O_NOLINK|O_NOTRANS);

  /* Validate permissions */
  if (! trivfs_check_access_hook)
    file_check_access (cred->realnode, &perms);
  else
    (*trivfs_check_access_hook) (cred->po->cntl, cred->user,
				 cred->realnode, &perms);
  if ((flags & (O_READ|O_WRITE|O_EXEC) & perms)
      != (flags & (O_READ|O_WRITE|O_EXEC)))
    return EACCES;

  /* Execute the open */
  err = 0;
  if (trivfs_check_open_hook)
    err = (*trivfs_check_open_hook) (cred->po->cntl, cred->user, flags);
  if (!err)
    {
      struct iouser *user;

      err = iohelp_dup_iouser (&user, cred->user);
      if (err)
	return err;

      err = trivfs_open (cred->po->cntl, user, flags,
			 cred->realnode, &newcred);
      if (err)
	iohelp_free_iouser (user);
      else
	mach_port_mod_refs (mach_task_self (), cred->realnode,
			    MACH_PORT_RIGHT_SEND, +1);
    }
  if (err)
    return err;

  *retry_type = FS_RETRY_NORMAL;
  *retry_name = '\0';
  *retrypt = ports_get_right (newcred);
  *retrypt_type = MACH_MSG_TYPE_MAKE_SEND;
  ports_port_deref (newcred);
  return 0;
}