Subject: Re: Migration question( OpenBSD 2.9 -> NetBSD -current)
To: BOUWSMA Beery <>
From: Luke Mewburn <>
List: current-users
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 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)
  | thanks,
  | 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  <>
Luke Mewburn     <>
Wasabi Systems - NetBSD hackers for hire
NetBSD - the world's most portable UNIX-like operating system