Re: [PATCH] block: bugfix for Amiga partition overflow check patch

[Michael Schmitz <schmitzmic@gmail.com>]

Hi Christian,

Am 02.07.2023 um 14:17 schrieb Michael Schmitz:
> If you cannot shrink the filesystem, you will have to edit the partition
> table to extend p4 to the end of the disk. Just replace the partition 4
> pb->pb_Environment[10] (at offset 0x8a8, current value 0x04d50344) by
> 0x04da02d8. As far as I can see, there is no adjustment to the partition
> block checksum required, as the checksummed block of 160 bytes ends just
> before the location of the partition's low and high cylinder addresses....
>
> I'd best verify that a patched RDB actually works...

Argh - the checksum is over 160 longwords, not bytes.

Replace the checksum (at offset 0x808, currently 0x25d82b54) by 0x25d32bc0.

With these changes, I get the same size for partition 4 as you got by 
truncation with the original RDB partition code. That might be the 
fastest way to get your Linux partition mountable again.

Cheers,

	Michael


>
> Cheers,
>
>     Michael
>
>
>
>>   11        0    1048575 sr0
>>    8       32     250880 sdc
>>    8       33     249856 sdc1
>>    8       16  234431064 sdb
>>    8       17  144364512 sdb1
>>    8       18          1 sdb2
>>    8       19   18500608 sdb3
>>    8       20   40717312 sdb4
>>    8       21   14684160 sdb5
>>    8       22   16161792 sdb6
>>    8       48       1440 sdd
>>    8       49       1439 sdd1
>