5 Nov
2024
5 Nov
'24
11:55 p.m.
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