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Use DIOCWLABEL ioctl before writing block 0 which might be 

protected by (now MI) bounds_check_with_label(9).
Fixes a problem on sysinst mentioned in PR port-macppc/38016.
This commit is contained in:
tsutsui 2008-05-09 10:14:35 +00:00
parent dba35d8b76
commit a9e4cec8d9
1 changed files with 31 additions and 4 deletions
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35
usr.sbin/installboot/arch/macppc.c
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@ -1,4 +1,4 @@
/* $NetBSD: macppc.c,v 1.9 2008/04/28 20:24:16 martin Exp $ */
/* $NetBSD: macppc.c,v 1.10 2008/05/09 10:14:35 tsutsui Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
@ -35,10 +35,14 @@
#include <sys/cdefs.h>
#if !defined(__lint)
__RCSID("$NetBSD: macppc.c,v 1.9 2008/04/28 20:24:16 martin Exp $");
__RCSID("$NetBSD: macppc.c,v 1.10 2008/05/09 10:14:35 tsutsui Exp $");
#endif /* !__lint */
#include <sys/param.h>
#ifndef HAVE_NBTOOL_CONFIG_H
#include <sys/ioctl.h>
#include <sys/dkio.h>
#endif
#include <assert.h>
#include <err.h>
@ -92,6 +96,10 @@ writeapplepartmap(ib_params *params, struct bbinfo_params *bb_params,
{
struct apple_drvr_map dm;
struct apple_part_map_entry pme;
int rv;
#ifdef DIOCWLABEL
int enable;
#endif
assert (params != NULL);
assert (bb_params != NULL);
@ -109,8 +117,27 @@ writeapplepartmap(ib_params *params, struct bbinfo_params *bb_params,
dm.sbSig = htobe16(APPLE_DRVR_MAP_MAGIC);
dm.sbBlockSize = htobe16(512);
dm.sbBlkCount = htobe32(0);
if (pwrite(params->fsfd, &dm, MACPPC_BOOT_BLOCK_BLOCKSIZE, 0) !=
MACPPC_BOOT_BLOCK_BLOCKSIZE) {
#ifdef DIOCWLABEL
/*
* block 0 is LABELSECTOR which might be protected by
* bounds_check_with_label(9).
*/
enable = 1;
rv = ioctl(params->fsfd, DIOCWLABEL, &enable);
if (rv != 0) {
warn("Cannot enable writes to the label sector");
return 0;
}
#endif
rv = pwrite(params->fsfd, &dm, MACPPC_BOOT_BLOCK_BLOCKSIZE, 0);
#ifdef DIOCWLABEL
/* Reset write-protect. */
enable = 0;
(void)ioctl(params->fsfd, DIOCWLABEL, &enable);
#endif
if (rv != MACPPC_BOOT_BLOCK_BLOCKSIZE) {
warn("Can't write sector 0 of `%s'", params->filesystem);
return (0);
}