> Why should a disk device driver CARE if there is a label on the disk
> or not?

So it can report the status up the call stack, of course.

That is, it shouldn't care, but in the current architecture (which
makes disk labels the responsibility of the disk drivers) it must.  Or
else all the upper layers that deal with disk labels must not care
either (and thus not care about getting the status), which strikes me
as fragile.

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