Date: Thu, 22 Aug 2002 08:55:51 -0700 From: David Schultz <dschultz@uclink.Berkeley.EDU> To: Kazuhito HONDA <kazuhito@ph.noda.tus.ac.jp> Cc: freebsd-current@FreeBSD.ORG Subject: Re: UFS2 may prevent from sharing partitions with some *BSDs Message-ID: <20020822155551.GA460@HAL9000.homeunix.com> In-Reply-To: <20020822.215921.424244459.kazuhito@ph.noda.tus.ac.jp> References: <20020822.215921.424244459.kazuhito@ph.noda.tus.ac.jp>
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Thus spake Kazuhito HONDA <kazuhito@ph.noda.tus.ac.jp>:
> In my machine, FreeBSD 5.0-current, NetBSD 1.6-BETA and OpenBSD 3.1
> are installed, and they share some partitions, e. g. /home, and
> had no problem.
> Now, however, after FreeBSD mount those partitions once,
> when NetBSD and OpenBSD mount those partitions at boot time,
> fsck stops with error number 8
> and *BSDs fall in single-user mode. `fsck -y' doesn't succeed too.
> If I run `fsck_ffs -b 32' on NetBSD and OpenBSD, fsck finishes completely.
> But FreeBSD mounts those partition once, NetBSD and OpenBSD fall in
> single-user mode again.
> Though this phenomenon doesn't happen with kernel at 21 June 2002 6:15 UTC,
> that happens with one at 6:20 UTC.
> Differences between them may be UFS2 codes.
> So UFS2 may prevent some *BSDs from mounting shared partitions.
This issue has come up several times before; check the archives.
As I understand, the problem is that -CURRENT uses
previously-unused fields in the superblock, which causes older
versions of fsck to go ballistic. You can fix this problem in
FreeBSD by using a more recent fsck. {Open,Net}BSD may not have
removed the extraneous sanity check, but specifying the block size
is a fine workaround.
BTW, the problem isn't UFS2. If you were using a UFS2 partition,
you wouldn't be able to mount the partition in {Open,Net}BSD at
all right now, as they lack the necessary support.
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