>> I still think we should change DIOCWDINFO to write the raw label,
>> even if there is no raw label.  [...]
> I agree -- I like encapsulating this code in one place, and only one
> place; and we can then prohibit user writes of the disklabel sectors
> all the time, no matter what,

I would find this last significantly annoying if it were to ever make
it into any version I use; I regularly clone whole disks with (the
moral equivalent of) dd if=/dev/rsd0c of=/dev/rsd1c.  Forcing
special-casing of the label sectors would be a right pain in the butt.

"Significantly annoying" as in a private patch to dike the code out
would instantly go into my private patches.  (Arguably making it a
sysctl would be a better reaction, but I'm disinclined to put effort
into a better implementation of something I think is a bad idea to
start with.)

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