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SubjectRe: [RFC 0/13] extents and 48bit ext3
On Fri, 09 Jun 2006 11:40:03 -0400
Jeff Garzik <jeff@garzik.org> wrote:

> Users are now forced to remember that, if they write to their filesystem
> after using either $mmver or $korgver kernels, they are locked out of
> using older kernels.

The same happens if we create ext4 - earlier kernels don't support that,
either.

I suppose we could call it ext4, although that wouldn't make much
difference operationally. The developers would probably choose to generate
ext4 from the same codebase as ext3 for maintainability reasons, rather
than choosing to copy-n-modify. We'd need to see the patches to be able to
finally make that judgement.

>
> And as features continue to be added in this manner, this problem gets
> _exponentially_ worse.

"continue to be added"? afaik this is the first time this has happened,
and there's no plan to do it again.

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