Subject: Re: Migration question( OpenBSD 2.9 -> NetBSD -current)
To: BOUWSMA Beery <email@example.com>
From: Luke Mewburn <firstname.lastname@example.org>
Date: 08/12/2002 00:01:03
On Tue, Aug 06, 2002 at 12:30:32AM +0200, BOUWSMA Beery wrote:
| > A while ago I took pains to ensure that the ffs superblock in NetBSD
| > would be compatible with FreeBSD's and OpenBSD's, so that explains why
| > the mount worked ok. I also took a brief look at other changes in ffs
| > on those systems at the time and I don't recall anything that would be
| > done to make things difficult.
| > If possible, I would like for NetBSD to be able to mount FreeBSD and
| > OpenBSD ffs partitions (there really should be no need for gratitious
| > incompability here, especially if we're not using newer features such
| > as snapshots on the partition, as all three systems are relatively
| Okay, things seem to have worked, more or less, until FreeBSD-current
| decided to do something to the superblock, which broke compatibility
| with NetBSD (and FreeBSD-stable before a certain date). This happened
| like a month or so ago, and FreeBSD-stable had to have its `fsck'
| changed to be compatible.
| But a quick single-user boot into NetBSD-current of, hmmm, two months
| ago, makes it appear that those filesystems that I share between all
| of NetBSD-current and FreeBSD, -current and -stable, no longer can
| be fsck'ed by NetBSD. There's some bit of discussion a couple weeks
| ago on the FreeBSD mailing lists about this change.
| I looked at my source tree for NetBSD-current's fsck and didn't
| see any obvious changes. If I'm not mistaken, the change that
| needs to be made, which limits the superblock/alternate-superblock
| comparison to only the fields that shouldn't differ, is the FreeBSD
| MFC 1.30 to src/sbin/fsck/setup.c in 126.96.36.199 2002/06/24, which
| diff should be relatively easy to munge into the NetBSD
| src/sbin/fsck_ffs/setup.c -- so that one doesn't need to invoke
| `fsck_ffs -b #' to attain satisfaction.
| Are there plans to attempt to remain compatible with the newer
| UFS features that recent FreeBSD-current has incorporated, such
| as the above FreeBSD-stable patch?
| (I might try shoehorning this patch in myself, but it'll be a
| spell before I'm able to boot into NetBSD and take a stab at it)
| barry bouwsma
I have put this on the list of things todo.
Would you mind submitting a NetBSD problem report with this request?
Luke Mewburn <email@example.com> http://www.wasabisystems.com
Luke Mewburn <firstname.lastname@example.org> http://www.netbsd.org
Wasabi Systems - NetBSD hackers for hire
NetBSD - the world's most portable UNIX-like operating system