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/*

 *  IMFS_unlink

 *

 *  Routine to remove a link node from the tree.

 *

 *  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.

 *

 *  $Id: imfs_unlink.c,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#include <errno.h>

#include <stdlib.h>

#include "imfs.h"

#include "libio_.h"

int IMFS_unlink(

  rtems_filesystem_location_info_t  *loc       /* IN */

)

{

  IMFS_jnode_t                      *node;

  rtems_filesystem_location_info_t   the_link;

  int                                result;

  node = loc->node_access;

  /*

   * Decrement the link counter of node pointed to and free the

   * space.

   */

  /*

   * If this is the last last pointer to the node

   * free the node.

   */

  if ( node->type == IMFS_HARD_LINK ) {

    if ( !node->info.hard_link.link_node )

      set_errno_and_return_minus_one( EINVAL );

    the_link = *loc;

    the_link.node_access = node->info.hard_link.link_node;

    IMFS_Set_handlers( &the_link );

    /*

     *  If removing the last hard link to a node, then we need

     *  to remove the node that is a link and the node itself.

     */

    node->info.hard_link.link_node->st_nlink --;

    IMFS_update_ctime( node->info.hard_link.link_node );

    if ( node->info.hard_link.link_node->st_nlink < 1) {

      result = (*the_link.handlers->rmnod)( &the_link );

      if ( result != 0 )

        return -1;

    }

  }

  /*

   *  Now actually free the node we were asked to free.

   */

  result = (*loc->handlers->rmnod)( loc );

  return result;

}