src/imfs/imfs_fsunmount.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup IMFS
0007  *
0008  * @brief Unmount this Instance of IMFS
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-1999.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <rtems/imfs.h>
0042
0043 #define jnode_get_control( jnode ) \
0044   (&((IMFS_directory_t *) jnode)->Entries)
0045
0046 #define jnode_has_no_children( jnode )  \
0047   rtems_chain_is_empty( jnode_get_control( jnode ) )
0048
0049 #define jnode_has_children( jnode ) \
0050   ( ! jnode_has_no_children( jnode ) )
0051
0052 #define jnode_get_first_child( jnode ) \
0053     ((IMFS_jnode_t *)( rtems_chain_head( jnode_get_control( jnode ) )->next))
0054
0055 void IMFS_fsunmount(
0056   rtems_filesystem_mount_table_entry_t *temp_mt_entry
0057 )
0058 {
0059    IMFS_jnode_t                     *jnode;
0060    IMFS_jnode_t                     *next;
0061    rtems_filesystem_location_info_t loc;
0062    int                              result = 0;
0063
0064    /*
0065     * Traverse tree that starts at the mt_fs_root and deallocate memory
0066     * associated memory space
0067     */
0068
0069    loc = temp_mt_entry->mt_fs_root->location;
0070    jnode = (IMFS_jnode_t *)loc.node_access;
0071
0072    do {
0073      next = jnode->Parent;
0074      loc.node_access = (void *)jnode;
0075      IMFS_Set_handlers( &loc );
0076
0077      if ( !IMFS_is_directory( jnode ) || jnode_has_no_children( jnode ) ) {
0078         result = IMFS_rmnod( NULL, &loc );
0079         if ( result != 0 )
0080       rtems_fatal_error_occurred( 0xdeadbeef );
0081         IMFS_node_destroy( jnode );
0082         jnode = next;
0083      }
0084      if ( jnode != NULL ) {
0085        if ( IMFS_is_directory( jnode ) ) {
0086          if ( jnode_has_children( jnode ) )
0087            jnode = jnode_get_first_child( jnode );
0088        }
0089      }
0090    } while (jnode != NULL);
0091 }