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add support for downgrading a filesystem fslevel from 4 to 3

This commit is contained in:
dbj 2004-04-14 17:37:11 +00:00
parent 0270c91526
commit f1e11b338f
1 changed files with 20 additions and 2 deletions
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22
sbin/fsck_ffs/setup.c
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@ -1,4 +1,4 @@
/* $NetBSD: setup.c,v 1.72 2004/04/14 17:35:19 dbj Exp $ */
/* $NetBSD: setup.c,v 1.73 2004/04/14 17:37:11 dbj Exp $ */
/*
* Copyright (c) 1980, 1986, 1993
@ -34,7 +34,7 @@
#if 0
static char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95";
#else
__RCSID("$NetBSD: setup.c,v 1.72 2004/04/14 17:35:19 dbj Exp $");
__RCSID("$NetBSD: setup.c,v 1.73 2004/04/14 17:37:11 dbj Exp $");
#endif
#endif /* not lint */
@ -198,6 +198,24 @@ setup(dev)
*/
sbdirty();
}
if (!is_ufs2 && cvtlevel == 3 &&
(sblock->fs_old_flags & FS_FLAGS_UPDATED)) {
if (preen)
pwarn("DOWNGRADING TO OLD SUPERBLOCK LAYOUT\n");
else if (!reply("DOWNGRADE TO OLD SUPERBLOCK LAYOUT"))
return(0);
sblock->fs_old_flags &= ~FS_FLAGS_UPDATED;
sb_oldfscompat_write(sblock, sblock);
sblock->fs_old_flags &= ~FS_FLAGS_UPDATED; /* just in case */
/* Leave postbl tables disabled, but blank its superblock region anyway */
sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT;
sblock->fs_old_cpc = 0;
sblock->fs_old_nrpos = 1;
sblock->fs_old_trackskew = 0;
memset(&sblock->fs_old_postbl_start, 0xff, 256);
sb_oldfscompat_read(sblock, &sblocksave);
sbdirty();
}
/*
* Check and potentially fix certain fields in the super block.
*/