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/*

 *  IMFS_unmount

 *

 *  This routine will look at a mount table entry that we are going to

 *  add to the mount table. If the mount point

 *  rtems_filesystem_location_info_t struct refers to a node that is a

 *  directory that has a file system mounted on it, the node will be

 *  marked as a mount point by * setting its directory.mt_fs pointer

 *  to NULL. This indicates that a directory is no longer mounted on

 *  this node.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  imfs_unmount.c,v 1.5 2002/01/04 18:30:58 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <errno.h>

#include "imfs.h"

#include <rtems/libio_.h>

#include <rtems/seterr.h>

int IMFS_unmount(

  rtems_filesystem_mount_table_entry_t *mt_entry

)

{

  IMFS_jnode_t  *node;

  node = mt_entry->mt_point_node.node_access;

  /*

   * Is the node that we are mounting onto a directory node ?

   */

  if ( node->type != IMFS_DIRECTORY )

    rtems_set_errno_and_return_minus_one( ENOTDIR );

  /*

   * Did the node indicate that there was a directory mounted here?

   */

  if ( node->info.directory.mt_fs == NULL )

    rtems_set_errno_and_return_minus_one( EINVAL );  /* XXX */

  /*

   * Set the mt_fs pointer to indicate that there is no longer

   * a file system mounted to this point.

   */

  node->info.directory.mt_fs = NULL;

  return 0;

}