[TUHS] Re: SCO's "evidence" (was: RIP Darl McBride former CEO of SCO)

[Warner Losh <imp@bsdimp.com>]

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On Tue, Nov 5, 2024 at 11:52 AM ron minnich <rminnich@gmail.com> wrote:

> I keep wondering if this assertion of code difference or lack thereof can
> be tested. Are not all these sources available? Which bits are missing?
>

Yes. Great question.

https://people.freebsd.org/~imp/pmap/pmap.32v
https://people.freebsd.org/~imp/pmap/pmap.4.2
https://people.freebsd.org/~imp/pmap/pmap.4.3
https://people.freebsd.org/~imp/pmap/pmap.net.2

has the functions as I extracted them for the diff numbers I posted before.
The TUHS archive links
are at:

https://www.tuhs.org/cgi-bin/utree.pl?file=V7/usr/sys/sys/subr.c
https://www.tuhs.org/cgi-bin/utree.pl?file=4BSD/usr/src/sys/sys/subr.c
https://www.tuhs.org/cgi-bin/utree.pl?file=4.2BSD/usr/src/sys/sys/ufs_bmap.c
https://www.tuhs.org/cgi-bin/utree.pl?file=4.3BSD/usr/src/sys/sys/ufs_bmap.c
https://github.com/sergev/4.4BSD-Lite2/blob/master/usr/
src/sys/ufs/ufs/ufs_bmap.c

in case anybody wants to check my math or characterizations about the
differences.

Warner


> On Tue, Nov 5, 2024 at 9:55 AM Noel Chiappa <jnc@mercury.lcs.mit.edu>
> wrote:
>
>>     > From: Warner Losh
>>
>>     >> On Mon, Nov 4, 2024 at 8:14PM Larry McVoy wrote:
>>
>>     >> The bmap implementations I saw were bit for bit identical, same
>> code,
>>     >> same variables, same style, same indentation. I'm 100% sure they
>> were
>>     >> not independent.
>>
>>     > They are different in 4.3BSD. They are different in 4.2BSD (but less
>>     > different). The underlying filesystems are different on disk, so
>> they
>>     > routines have to be different.
>>
>> That last sentence points out something important that people need to
>> remember
>> in this discussion: in between 4.1 and 4.2 (technically, in 4.1B), BSD
>> switched to the BSD Fast File System, so I very much doubt that the
>> low-level
>> (i.e. logical file block to disk block) file system code in anything after
>> 4.1A looks much like the AT+T low-level file system code. (I have no idea
>> how
>> the BSD code compares to the Linux file system code, but that's between
>> the
>> Linux people, and Berkeley.)
>>
>>         Noel
>>
>

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