Hi Martin,
On Thu, Jun 28, 2018 at 9:29 AM Martin Steigerwald <martin@xxxxxxxxxxxx> wrote:
Michael Schmitz - 28.06.18, 06:58:
[…]
In the interest of least surprises, we have to fix the 32 bit
overflow (so we can even detect that it would have happened), and
give the user the chance to carefully consider whether to accept
the new behaviour. That means refusing to make available any
partition that would have been affected by such overflow.
That is acceptable for me as I told before. Either mount or refuse
to
mount, but do not overflow and mount nonetheless :)
Mind you, I am not using my Amiga machines either at the moment. And
I repurposed the 2 TB disk years ago.
That's fine - I understand the 'profile' image was a true binary copy
of the RDB, and placing that file at offset 0 in an image file is a
legitimate use?
You actually ask me to remember about what that 'profile' image was? :)
Well, in the attachment note on the bug report I wrote: "should be just
a binary copy", so I did not know exactly back then either. However the
file starts with "RDSK" and then it has "PART" headers and so on. That
looks pretty much like a binary copy of an RDB. I am a bit surprised by
its small size of 2 KiB. But I see three partitions in there. According
to the screenshot I also provided, the disk had three partitions. So
probably Media Toolbox has been intelligent enough to just copy the used
space of the reserved RDB area. Cause I think the reserved space must
have been higher than 2 KiB. However the RDB/disk geometry editing
screen does not display it and off hand I do not know where to look
inside the RDB to see how much space has been reserved. Interestingly
the "Total sectors" value in that Media Toolbox window also overflowed.
The RDB can be anywhere in the first 2 tracks of the disk, and is identified
by the "RDSK" block (with a correct checksum). The remainder (e.g. "PART"
blocks) is in a linked list. So 2 KiB sounds fine for 3 partitions (1 RDSK +
3 * PART = 4 blocks = 4 * 512 bytes).
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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