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    SubjectRe: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
    Theodore Tso wrote:
    > We don't do this with the SCSI layer where we make a complete clone of
    > the driver layer so that there is a /usr/src/linux/driver/scsi and
    > /usr/src/linux/driver/scsi2, do we? And we didn't do that with the
    > networking layer either, as we added ipsec, ipv6, softnet, and a whole
    > host of other changes and improvements.
    >
    > What we do instead is we have a series of patches, which can be made
    > available in various experimental trees, and as they get more
    > polishing and experience with people using it without any problems,
    > they can get merged into the -mm tree, and then eventually, when they
    > are deemed ready, into mainline. That is also the normal Linux
    > development process, and it's worked quite well up until now with ext3.

    No, there is a key difference between ext3 and SCSI/etc.: cruft is removed.

    In ext3, old formats are supported for all eternity.


    > Folks seem to be worried about ext3 being "too important to experiment
    > with", but the fact remains, we've been doing continuous improvement
    > with ext3 for quite some time, and it's been quite smooth. The htree
    > introduction was essentially completely painless, for example --- and

    I disagree. There were some distro annoyances as I recall.


    > people liked the fact that they could get the features of indexed
    > directories without needing to do a complete dump and restore of the
    > filesystem.

    Of course people always like new features. :)

    ext4 should allow you to deliver new features more rapidly, while
    keeping the existing ext3 happily stable.

    Jeff


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