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After modifying the Apple Disk Partition Map, use the DIOCGDINFO/DIOCWDINFO

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ioctls to refresh the in-core disk label.  From Bob Nestor.
This commit is contained in:
scottr 2001-07-14 07:57:16 +00:00
parent 79e44b9f63
commit 8f69e0c022
2 changed files with 35 additions and 8 deletions
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24
distrib/utils/sysinst/arch/mac68k/md.c
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@ -1,4 +1,4 @@
/* $NetBSD: md.c,v 1.19 2001/01/14 02:38:19 mrg Exp $ */
/* $NetBSD: md.c,v 1.20 2001/07/14 07:57:16 scottr Exp $ */
/*
* Copyright 1997 Piermont Information Systems Inc.
@ -683,7 +683,29 @@ md_pre_disklabel()
}
/*
* Well, if we get here the dirty deed has been done.
*
* Now we need to force the incore disk table to get updated. This
* should be done by disklabel -- which is normally called right after
* we return -- but may be commented out for the mac68k port. We'll
* instead update the incore table by forcing a dummy write here. This
* relies on a change in the mac68k-specific writedisklabel() routine.
* If that change doesn't exist nothing bad happens here. If disklabel
* properly updates the ondisk and incore labels everything still
* works. Only if we fail here and if disklabel fails are we in
* in a state where we've updated the disk but not the incore and
* a reboot is necessary.
*
* First, we grab a copy of the incore label as it existed before
* we did anything to it. Then we invoke the "write label" ioctl to
* rewrite it to disk. As a result, the ondisk partition map is
* re-read and the incore label is reconstructed from it. If
* disklabel() is then called to update again, either that fails
* because the mac68k port doesn't support native disklabels, or it
* succeeds and writes out a new ondisk copy.
*/
ioctl(fd, DIOCGDINFO, &lp); /* Get the current disk label */
ioctl(fd, DIOCWDINFO, &lp); /* Write it out again */
close (fd);
return 0;
}

11
distrib/utils/sysinst/arch/mac68k/md.h
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@ -1,4 +1,4 @@
/* $NetBSD: md.h,v 1.7 2000/12/22 10:12:15 mrg Exp $ */
/* $NetBSD: md.h,v 1.8 2001/07/14 07:57:17 scottr Exp $ */
/*
* Copyright 1997 Piermont Information Systems Inc.
@ -187,8 +187,13 @@ EXTERN char *disk_names[]
* hand-edited disklabel will NOT be written by MI code.
*
* The mac68k port doesn't support real disklabels so we don't define the
* command string. The Mac Disk Partition Map gets written in the
* md_pre_disklabel() routine.
* command string. The Apple Disk Partition Map gets written in the
* md_pre_disklabel() routine, which also forces the incore copy to be
* updated. If native disklabels are supported or if disklabel() is
* fixed to work for writing labels, this command should be defined
* to a value that will force the writing of the label. In that case,
* the code in md_pre_disklabel() which forces the incore update can be
* removed, though its presence won't hurt.
*
* #define DISKLABEL_CMD
*/