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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [imfs_fsunmount.c] - Blame information for rev 846

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1 30 unneback
/*
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 *  IMFS Initialization
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: imfs_fsunmount.c,v 1.2 2001-09-27 12:01:15 chris Exp $
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 */
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#include <sys/types.h>         /* for mkdir */
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "imfs.h"
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#include "libio_.h"
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#if defined(IMFS_DEBUG)
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#include <stdio.h>
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#endif
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/*
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 *  IMFS_fsunmount
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 */
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#define jnode_get_control( jnode ) \
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  (&jnode->info.directory.Entries)
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#define jnode_has_no_children( jnode )  \
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  Chain_Is_empty( jnode_get_control( jnode ) )
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#define jnode_has_children( jnode ) \
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  ( ! jnode_has_no_children( jnode ) )
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#define jnode_get_first_child( jnode ) \
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    ((IMFS_jnode_t *)( Chain_Head( jnode_get_control( jnode ) )->next))
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int IMFS_fsunmount(
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  rtems_filesystem_mount_table_entry_t *temp_mt_entry
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)
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{
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   IMFS_jnode_t                     *jnode;
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   IMFS_jnode_t                     *next;
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   rtems_filesystem_location_info_t loc;
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   int                              result = 0;
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   /*
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    * Traverse tree that starts at the mt_fs_root and deallocate memory
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    * associated memory space
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    */
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   jnode = (IMFS_jnode_t *)temp_mt_entry->mt_fs_root.node_access;
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   loc = temp_mt_entry->mt_fs_root;
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   /*
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    *  Set this to null to indicate that it is being unmounted.
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    */
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   temp_mt_entry->mt_fs_root.node_access = NULL;
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   do {
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     next = jnode->Parent;
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     loc.node_access = (void *)jnode;
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     IMFS_Set_handlers( &loc );
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     if ( jnode->type != IMFS_DIRECTORY ) {
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        result = IMFS_unlink( &loc );
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        if (result != 0)
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          return -1;
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        jnode = next;
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     } else if ( jnode_has_no_children( jnode ) ) {
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        result = IMFS_unlink( &loc );
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        if (result != 0)
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          return -1;
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        jnode = next;
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     }
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     if ( jnode != NULL ) {
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       if ( jnode->type == IMFS_DIRECTORY ) {
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         if ( jnode_has_children( jnode ) )
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           jnode = jnode_get_first_child( jnode );
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       }
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     }
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   } while (jnode != NULL);
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   return 0;
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}
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