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SubjectRe: regarding major number of block extended devt
On Thu, Sep 04 2008, Tejun Heo wrote:
> Hello,
>
> H. Peter Anvin wrote:
> > Thinking about it some more, one invariant this is *guaranteed* to
> > violate is:
> >
> > partition_number = partition_device - master_device
> >
> > Code that needs a partition number (which is common enough) are using
> > this invariant, because (a) it has held for 17 years and (b) because
> > there is still no alternative other that relying on fragile naming
> > scheme hacks.
> >
> > (a) we can't do anything about, but (b) we can, by introducing a
> > partition number attribute in sysfs.
>
> Yeah, that would certainly be a nice addition. Also, if partitions
> are made proper classes, they'll be easily enumerable by
> /sys/block/*/partitions/*.
>
> Jens, what do you think?

Agree, that addition definitely makes sense.

--
Jens Axboe



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