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/*
* IMFS_rmnod
*
* This routine is available from the optable to remove a node
* from the IMFS file system.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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.
*
* $Id$
*/
#include <errno.h>
#include "libio_.h"
#include "imfs.h"
int IMFS_rmnod(
rtems_filesystem_location_info_t *pathloc /* IN */
)
{
IMFS_jnode_t *the_jnode;
the_jnode = (IMFS_jnode_t *) pathloc->node_access;
if ( the_jnode->type == IMFS_DIRECTORY ) {
/*
* You cannot remove a node that still has children
*/
if ( ! Chain_Is_empty( &the_jnode->info.directory.Entries ) )
set_errno_and_return_minus_one( ENOTEMPTY );
/*
* You cannot remove the file system root node.
*/
if ( pathloc->mt_entry->mt_fs_root.node_access == pathloc->node_access )
set_errno_and_return_minus_one( EBUSY );
/*
* You cannot remove a mountpoint.
*/
if ( the_jnode->info.directory.mt_fs != NULL )
set_errno_and_return_minus_one( EBUSY );
}
/*
* Take the node out of the parent's chain that contains this node
*/
if ( the_jnode->Parent != NULL ) {
Chain_Extract( (Chain_Node *) the_jnode );
the_jnode->Parent = NULL;
}
/*
* Decrement the link counter and see if we can free the space.
*/
the_jnode->st_nlink--;
IMFS_update_ctime( the_jnode );
/*
* The file cannot be open and the link must be less than 1 to free.
*/
if ( !rtems_libio_is_file_open( the_jnode ) && (the_jnode->st_nlink < 1) ) {
/*
* Is the rtems_filesystem_current is this node?
*/
if ( rtems_filesystem_current.node_access == pathloc->node_access )
rtems_filesystem_current.node_access = NULL;
/*
* Free memory associated with a memory file.
*/
if ( the_jnode->type == IMFS_MEMORY_FILE )
IMFS_memfile_remove( the_jnode );
free( the_jnode );
}
return 0;
}
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