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    SubjectRe: [PATCH 0/8][RFC] IO latency/throughput fixes
    On Mon, Apr 06, 2009 at 01:12:08PM -0700, Hua Zhong wrote:
    > Grr..making writeback as default would break people's setup that relies on
    > the ordered semantics, especially in the embedded world. It's a big no-no.

    I've added workarounds for 2.6.30 that provide the replace-via-rename
    and replace-via-truncate workarounds for ext3 data=writeback cases.
    See commits e7c8f507 and f7ab34ea.

    There won't be an implied fsync for newly created files, yes, but you
    could have crashed 5 seconds earlier, at which point you would have
    lost the newly created file anyway. Replace-via-rename and
    replace-via-truncate solves the problem for applications which are
    editing pre-existing files, which was most of people's complaints
    about depending on data=ordered semantics.

    - Ted

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