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/*

 *  IMFS Initialization

 *

 *  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_fsunmount.c,v 1.7 2001/01/22 14:05:14 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <sys/types.h>         /* for mkdir */

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include <assert.h>

#include "imfs.h"

#include <rtems/libio_.h>

#if defined(IMFS_DEBUG)

#include <stdio.h>

#endif

/*

 *  IMFS_fsunmount

 */

#define jnode_get_control( jnode ) \

  (&jnode->info.directory.Entries)

#define jnode_has_no_children( jnode )  \

  Chain_Is_empty( jnode_get_control( jnode ) )

#define jnode_has_children( jnode ) \

  ( ! jnode_has_no_children( jnode ) )

#define jnode_get_first_child( jnode ) \

    ((IMFS_jnode_t *)( Chain_Head( jnode_get_control( jnode ) )->next))

int IMFS_fsunmount(

  rtems_filesystem_mount_table_entry_t *temp_mt_entry

)

{

   IMFS_jnode_t                     *jnode;

   IMFS_jnode_t                     *next;

   rtems_filesystem_location_info_t loc;

   int                              result = 0;

   /*

    * Traverse tree that starts at the mt_fs_root and deallocate memory

    * associated memory space

    */

   jnode = (IMFS_jnode_t *)temp_mt_entry->mt_fs_root.node_access;

   loc = temp_mt_entry->mt_fs_root;

   /*

    *  Set this to null to indicate that it is being unmounted.

    */

   temp_mt_entry->mt_fs_root.node_access = NULL;

   do {

     next = jnode->Parent;

     loc.node_access = (void *)jnode;

     IMFS_Set_handlers( &loc );

     if ( jnode->type != IMFS_DIRECTORY ) {

        result = IMFS_unlink( &loc );

        if (result != 0)

          return -1;

        jnode = next;

     } else if ( jnode_has_no_children( jnode ) ) {

        result = IMFS_unlink( &loc );

        if (result != 0)

          return -1;

        jnode = next;

     }

     if ( jnode != NULL ) {

       if ( jnode->type == IMFS_DIRECTORY ) {

         if ( jnode_has_children( jnode ) )

           jnode = jnode_get_first_child( jnode );

       }

     }

   } while (jnode != NULL);

   return 0;

}