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    SubjectRe: [PATCH] barrier patch set
    Jens Axboe <axboe@suse.de> wrote:
    >
    > A first release of a collected barrier patchset for 2.6.5-rc1-mm2.

    The tagging of BIOs with set_buffer_ordered() or WRITE_BARRIER is a little
    awkward.

    Take the case of an ext2 fsync() or even an ext3 fsync() which frequently
    will not trigger a commit. If we must perform the barrier by tagging the
    final BIO, that will be tricky to implement. I could set some new field in
    struct writeback_control and rework the mpage code, but working out "this
    is the final BIO for this operation" is a fairly hard thing to do.
    sys_sync() would require even more VFS surgery.

    Generally, it would be much preferable to use the blkdev_issue_flush() API.
    What is the status of that?

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