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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [imfs_unlink.c] - Blame information for rev 173

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1 30 unneback
/*
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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) 1989-1999.
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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_unlink.c,v 1.2 2001-09-27 12:01:15 chris Exp $
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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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