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    SubjectRe: Proposal and plan for ext2/3 future development work
    On Fri, Jun 30, 2006 at 12:39:48PM +0200, Andi Kleen wrote:
    > "Theodore Ts'o" <> writes:
    > >
    > > 1) The creation of a new filesystem codebase in the 2.6 kernel tree in
    > > /usr/src/linux/fs/ext4 that will initially register itself as the
    > > "ext3dev"
    > Why not call it ext4 from the beginning too? Calling the directory
    > differently from the file system can only cause confusion.
    > I assume if it's marked very experimental people who value their data
    > will avoid it for the time being.

    There were a lot of people who were concerned that simply marking it
    CONFIG_EXPERIMENTAL might not be enough for to make it very clear that
    the filesystem format is still changing. In order to address this
    concern, we want /etc/fstab to make it abundantly clear that the
    filesystem format itself is not necessarily stable, and that new
    features are being added that might not be supported on older

    In general the same old rules will apply in that unless you explicitly
    enable a feature via tune2fs or at mke2fs-time, it should work on
    older kernels (just as in theory all of the kernel code that we are
    throwing willy-nilly into userpsace is **supposed** to be forward
    compatible), but if we paint ourselves in the a corner, there may be a
    reason why we have to break that compatibility promise.

    - Ted
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