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Date:      Sat, 18 Jul 1998 09:35:59 +0000 (GMT)
From:      Terry Lambert <tlambert@primenet.com>
To:        michaelh@cet.co.jp (Michael Hancock)
Cc:        Matthew.Alton@anheuser-busch.com, FreeBSD-fs@FreeBSD.ORG
Subject:   Re: LFS & soft updates
Message-ID:  <199807180935.CAA03733@usr07.primenet.com>
In-Reply-To: <Pine.SV4.3.95.980718152940.13506A-100000@parkplace.cet.co.jp> from "Michael Hancock" at Jul 18, 98 03:36:11 pm

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> > What is the status of the McKusick soft-update work?
> > Specifically, I need to know if it is usable under 2.2.6 and
> > if I have access to the code.
> 
> It's only for current.  If you don't have current then have a
> look at http://www.freebsd.org/~julian.

See my recent postings.

The soft updates code is intrinsically tied to the buffer cache
implementation because of what constitutes a dependency.  Because
2.2.6 and -current have different implementations, the code will
not port over easily.

The implementations are similar, of course, but the code depends
on a brute-force soloution to a graph problem.

To do the port, you would effectively have to do what I suggested
was necessary for an LFS port.

One interesting thing to note is that there may, in fact, be more
dependencies being queued than is strictly necessary; doing the
documentation of the events/actors might be a good thing for the
-current code, as well, since it might lead to simplifications of
the existing code.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.

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