Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3

[Jeff Garzik]

H. Peter Anvin wrote:
> Followup to:  <4489EAFE.6090303@xxxxxxxxxx>
> By author:    Jeff Garzik <jeff@xxxxxxxxxx>
> In newsgroup: linux.dev.kernel
> > Theodore Tso wrote:
> > > And I'd also dispute with your "weren't really suited for the original
> > > ext2-style design" comment.  Ext2/3 was always designed to be
> > > extensible from the start, and we've successfully added features quite
> > > successfully for quite a while.

> > Although not the only disk format change, extents are a pretty big one. 
> > Will this be the last major on-disk format change?

> "Last" is a pretty strong word.  Will extents be combined with 64-bit
> block numbers?  That's becoming increasingly urgent.


Right, and that proves my point.  When you start making major changes 
like 32->64 bit block numbers, you should communicate to the user (with 
a big blinky "ext4" sign) that his filesystem metadata will change a 
lot, not a little.  Not to mention that such code will add yet more "if 
(new) .. else .." code.

	Jeff


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