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      1 /*	$NetBSD: build.c,v 1.3 2009/03/14 21:04:06 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Julian Coleman, Waldi Ravens and Leo Weppelman.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "privahdi.h"
     33 #include <strings.h>
     34 
     35 /*
     36  * Build AHDI auxillary roots (extended partitions).
     37  * Always make first 3 partitions real.
     38  */
     39 int
     40 ahdi_buildlabel (struct ahdi_ptable *ptable)
     41 {
     42 	int			i, j;
     43 	struct ahdi_ptable	old_table;
     44 
     45 	/* Copy original ptable */
     46 	bcopy (ptable, &old_table, sizeof (struct ahdi_ptable));
     47 
     48 	/*
     49 	 * Adjust partition starts.  Do this first because some
     50 	 * partitioning tools (ICD) change the relative ordering of
     51 	 * auxiliary roots vs. partitions.
     52  	 */
     53 	for (i = 0; i < ptable->nparts; i++)
     54 		for (j = 0; j < ptable->nparts; j++)
     55 			if (ptable->parts[j].start ==
     56 		    	ptable->parts[i].root + 1) {
     57 				if (ptable->parts[j].start)
     58 					ptable->parts[j].start--;
     59 				if (ptable->parts[j].size)
     60 					ptable->parts[j].size++;
     61 			}
     62 	for (i = 0; i < ptable->nparts; i++) {
     63 		/* Remove auxiliary roots for first 3 (or all) partitions */
     64 		if (i < 3 || (i < 4 && ptable->nparts < 5)) {
     65 				ptable->parts[i].root = 0;
     66 		/* Create auxiliary roots for other partitions */
     67 		} else {
     68 			ptable->parts[i].root = ptable->parts[i].start;
     69 			if (ptable->parts[i].start)
     70 				ptable->parts[i].start++;
     71 			if (ptable->parts[i].size)
     72 				ptable->parts[i].size--;
     73 		}
     74 	}
     75 
     76 	/* Compare old and new */
     77 	for (i = 0; i < ptable->nparts; i++)
     78 		if (ptable->parts[i].root != old_table.parts[i].root ||
     79 		    ptable->parts[i].start != old_table.parts[i].start ||
     80 		    ptable->parts[i].size != old_table.parts[i].size)
     81 			return (1);
     82 
     83 	return (0);
     84 }
     85