[rfc] 64-bit inode numbers

[mdf at FreeBSD.org]

On Fri, Jun 24, 2011 at 2:07 PM, Garance A Drosehn <gad at freebsd.org> wrote:
> The AFS cell at RPI has approximately 40,000 AFS volumes, and each
> volume should have it's own dev_t (IMO).
>
> Please realize that I do not mind if people felt that there was no
> need to increase the size of dev_t at this time, and that we should
> wait until we see more of a demand for increasing it.  But given the
> project to increase the size of inode numbers, I thought this was a
> good time to also ask about dev_t.  I ask about it every few years :-)

I don't see why 32 bits are anywhere close to becoming tight to
represent 40k unique values.  Is there something wrong with how each
new dev_t is computed, that runs out of space quicker than this
implies?

Thanks,
matthew