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/*
* IMFS Node Removal Handler
*
* This file contains the handler used to remove a node when a file type
* does not require special actions.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Modifications to support reference counting in the file system are
* Copyright (c) 2012 embedded brains GmbH.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
#include <stdlib.h>
void IMFS_create_orphan( IMFS_jnode_t *jnode )
{
if ( jnode->Parent != NULL ) {
rtems_chain_extract( &jnode->Node );
jnode->Parent = NULL;
}
--jnode->st_nlink;
IMFS_update_ctime( jnode );
}
void IMFS_check_node_remove( IMFS_jnode_t *jnode )
{
if ( jnode->st_nlink < 1 ) {
switch ( jnode->type ) {
case IMFS_MEMORY_FILE:
IMFS_memfile_remove( jnode );
break;
case IMFS_SYM_LINK:
free( jnode->info.sym_link.name );
break;
default:
break;
}
free( jnode );
}
}
static int IMFS_rmnod_directory(
const rtems_filesystem_location_info_t *parentloc,
const rtems_filesystem_location_info_t *loc
)
{
IMFS_jnode_t *node = loc->node_access;
int rv = 0;
if ( !rtems_chain_is_empty( &node->info.directory.Entries ) ) {
errno = ENOTEMPTY;
rv = -1;
} else if (
rtems_filesystem_location_is_root( loc )
|| node->info.directory.mt_fs != NULL
) {
errno = EBUSY;
rv = -1;
}
return rv;
}
static int IMFS_rmnod_hard_link(
const rtems_filesystem_location_info_t *parentloc,
const rtems_filesystem_location_info_t *loc
)
{
int rv = 0;
IMFS_jnode_t *node = loc->node_access;
IMFS_jnode_t *target = node->info.hard_link.link_node;
if ( target->st_nlink == 1) {
rtems_filesystem_location_info_t target_loc = *loc;
target_loc.node_access = target;
IMFS_Set_handlers( &target_loc );
rv = (*target_loc.ops->rmnod_h)( parentloc, &target_loc );
} else {
--target->st_nlink;
IMFS_update_ctime( target );
}
return rv;
}
int IMFS_rmnod(
const rtems_filesystem_location_info_t *parentloc,
const rtems_filesystem_location_info_t *loc
)
{
int rv = 0;
IMFS_jnode_t *node = loc->node_access;
switch ( node->type ) {
case IMFS_DIRECTORY:
rv = IMFS_rmnod_directory( parentloc, loc );
break;
case IMFS_HARD_LINK:
rv = IMFS_rmnod_hard_link( parentloc, loc );
break;
default:
break;
}
if ( rv == 0 ) {
IMFS_create_orphan( node );
IMFS_check_node_remove( node );
}
return rv;
}
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