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    SubjectRe: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
    Michael Poole wrote:
    > Jeff Garzik writes:
    >
    >> 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?
    >
    > You keep making "straw that broke the camel's back" type arguments
    > without saying why this particular straw (rather than the other
    > compatibility-breaking features that are already in ext3) is the one
    > that must not be allowed. Is it a matter of taste, or is there some
    > objective threshold that extents cross?

    Yes, it's not a small change to the on-disk format.

    If you write tools that read an ext3 filesystem, you won't be able to
    read file data at all, without updating your code.

    That's a much bigger deal than say 32-bit uids.

    Jeff



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