forked from Imagelibrary/rtems
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
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* IMFS_unlink
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*
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* Routine to remove a link node from the tree.
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*
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* COPYRIGHT (c) 1989-1998.
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* On-Line Applications Research Corporation (OAR).
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* Copyright assigned to U.S. Government, 1994.
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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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* $Id$
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include "imfs.h"
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#include "libio_.h"
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int IMFS_unlink(
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rtems_filesystem_location_info_t *loc /* IN */
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)
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{
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IMFS_jnode_t *node;
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rtems_filesystem_location_info_t the_link;
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int result;
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node = loc->node_access;
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/*
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* Decrement the link counter of node pointed to and free the
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* space.
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*/
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/*
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* If this is the last last pointer to the node
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* free the node.
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*/
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if ( node->type == IMFS_HARD_LINK ) {
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if ( !node->info.hard_link.link_node )
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set_errno_and_return_minus_one( EINVAL );
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the_link = *loc;
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the_link.node_access = node->info.hard_link.link_node;
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IMFS_Set_handlers( &the_link );
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/*
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* If removing the last hard link to a node, then we need
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* to remove the node that is a link and the node itself.
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*/
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node->info.hard_link.link_node->st_nlink --;
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IMFS_update_ctime( node->info.hard_link.link_node );
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if ( node->info.hard_link.link_node->st_nlink < 1) {
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result = (*the_link.handlers->rmnod)( &the_link );
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if ( result != 0 )
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return -1;
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}
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}
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/*
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* Now actually free the node we were asked to free.
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*/
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result = (*loc->handlers->rmnod)( loc );
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return result;
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}
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