6 Nov
2024
6 Nov
'24
12:52 a.m.
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?
On Tue, Nov 5, 2024 at 9:55 AM Noel Chiappa <jnc(a)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