Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
From: Jeff Garzik
Date: Fri Jun 09 2006 - 17:56:00 EST
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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