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Date:      Fri, 06 Jul 2001 11:31:49 +0100
From:      Antony T Curtis <antony@abacus.co.uk>
To:        Greg Lehey <grog@FreeBSD.ORG>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: JFS (was: The FreeBSD core team needs your help)
Message-ID:  <3B459395.120DFE27@abacus.co.uk>
References:  <20010608134705.19635.qmail@web14701.mail.yahoo.com> <004001c0f030$36a0d3e0$0600020a@frontend> <20010612120958.G10614@tao.org.uk> <20010612192245.4ce69cf3.steveo@eircom.net> <20010613102151.G5486@wantadilla.lemis.com> <3B42F210.C49FCED8@abacus.co.uk> <20010705090711.D371@sydney.worldwide.lemis.com>

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Greg Lehey wrote:
> 
> On Wednesday,  4 July 2001 at 11:38:08 +0100, Antony T Curtis wrote:
> > Greg Lehey wrote:
> >>
> >> On Tuesday, 12 June 2001 at 19:22:45 +0200, Steve O'Hara-Smith wrote:
> >>> On Tue, 12 Jun 2001 12:09:58 +0100
> >>> Josef Karthauser <joe@tao.org.uk> wrote:
> >>>
> >>>> On Fri, Jun 08, 2001 at 08:32:23AM -0700, Eric Parusel wrote:
> >>>>>>> A journalling FS for those people who just hate waiting for a
> >>>>> couple
> >>>>>>> of
> >>>>>>> TB of slow disks to fsck?
> >>>>>>
> >>>>>> Does ReiserFS work with FreeBSD?
> >>>>>
> >>>>>> From what I've read, XFS is quite good as well....  (Whether or not it
> >>>>> could ever work with *BSD, I don't know)
> >>>>
> >>>> Apparently XFS would run better on FreeBSD than on Linux, from what
> >>>
> >>>       Whatever happened to the open source release of JFS, or is JFS really
> >>> bad ?
> >>
> >> The open source version of JFS was based on OS/2, not AIX.  It's not
> >> an overly good fit to UNIX.
> >
> > That was only because AIX's JFS implementation was so closely bound into
> > their kernel that there was no easy way to "port" it out of it. Also,
> > AFAIK, it was written in a mesh of different languages too, including
> > POWER architecture assembly.
> >
> > The OS/2 version was the first clean implementation to plug into OS/2's
> > IFS driver model - and being written in C, it is much more 'portable'.
> > (AFAIK, it was supposed to be able to be recompiled for OS/2 for CHRP
> > PowerPC)
> 
> Since writing that (quite some time ago, IIRC) I have joined IBM and
> am now working with the people who did the JFS port.  They
> substantially confirm your viewpoint, with the added information that
> the "old" JFS, now called JFS 1, is being phased out under AIX, and
> the "new" AIX JFS, JFS 2, is based on the same code base as the OS/2
> port.  With that background, IBM's approach makes a lot more sense.
> It's a pity that this issue wasn't clarified earlier.

Is it JFS2 in AIX5L or will there be a backport to AIX4.3?

> > All said, I would be interested in a JFS port for FreeBSD ....
> 
> I'm going to be doing a lot of work on JFS in the next few months.  I
> don't think I'll port it to FreeBSD, but I'll be available for
> questions, and I'll have a better understanding.

Sounds great... I wonder if they'd accept back in diffs.
 
> >> unix soit qui mal y pense
> 
> You're aware that the original word of this phrase, "hon(n)i", means
> "ashamed"?

I didn't have a clue... My sig has a different fortune for every email.

-- 
ANTONY T CURTIS                     Tel: +44 (1635) 36222
Abacus Polar Holdings Ltd           Fax: +44 (1635) 38670
> Today is the first day of the rest of the mess

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