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    SubjectRe: Linux 2.6.29
    On Fri, Mar 27, 2009 at 08:57:23AM +0100, Jens Axboe wrote:
    >
    > Here's a simple patch that does that. Not even tested, it compiles. Note
    > that file systems that currently do blkdev_issue_flush() in their
    > ->sync() should then get it removed.
    >

    That's going to be a mess. Ext3 implements an fsync() by requesting a
    journal commit, and then waiting for the commit to have taken place.
    The commit happens in another thread, kjournald. Knowing when it's OK
    not to do a blkdev_issue_flush() because the commit was triggered by
    an fsync() is going to be really messy. Could we at least have a flag
    in struct super which says, "We'll handle the flush correctly, please
    don't try to do it for us?"

    - Ted



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