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On Thu, May 16, 2002 at 10:02:06PM +0200, Manuel Bouyer wrote:
> On Thu, May 16, 2002 at 10:57:35AM +0930, Greg 'groggy' Lehey wrote:
> > Most of the block I/O subsystem works with 32 bit signed sector
> > numbers.  In particular, IIRC, (small) negative values are used to
> > indicate error conditions.  We've tried this in FreeBSD, and we've
> > never got beyond 1 TB.  I suspect it's possible to get almost to 2 TB
> > (ignoring sector numbers which correspond to error numbers), but I
> > expect it would be quite a bit of work, and it would give rise to
> > compatibility issues.
>=20
> Maybe we could just go to 64bits in the kernel, changing the int32_t to
> u_int32_t in the on-disk filesystems structures ?
> This would give us 2T instead of 1 ...

Aren't negative block pointers in FFS used as a flag - marking indirect
blocks or something like that?

BIANA ffs guru, and it's been a few years since I looked at this.

	-is

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