fdisk(8) vs gpart(8), and gnop

[Andrey V. Elsukov]

On 01.06.2014 18:36, Warren Block wrote:
> Thread starts here:
> http://lists.freebsd.org/pipermail/freebsd-geom/2014-February/005835.html
> 
>> For the longest time geom would warn about "geometry does not match
>> label" that had something to do with different parts of the code
>> calculating different CHS values.  Eventually it was decided to remove
>> the unactionable message, and my vague memory is that the justification
>> was basically "because CHS is meaningless to geom and modern BIOSen."
>>
>> If there's some "it would cause problems on this ancient hardware that
>> only 3 people in the world use" (I'm usually one of those people -- we
>> support some old equipment in the field at $work), then maybe there
>> could be a flag that enables the old CHS alignment behavior.
> 
> Short form of above: gpart is supposed to hide and handle underlying
> GEOM issues, so it needs an override to be able to create these
> "non-standard" MBRs with slices aligned to arbitrary values.

Hello,

I propose add a sysctl variable kern.geom.part.mbr.enforce_chs which is
set by default. Merge it to all branches, then change it to zero in
head/. User could change it when he wants to use alignment to 4k.
And if there is no objections against this, I can do it.

-- 
WBR, Andrey V. Elsukov

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