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    SubjectRe: The INN/mmap bug

    On Mon, 18 Sep 2000, Chris Mason wrote:
    > ReiserFS depends on the buffer head up to date flag being correct when it
    > is sent to get_block. When unpacking the tail, we have to know if the
    > packed data on disk should be copied over the data in the page.
    > So, the above should work for us if you tested Page_Uptodate before testing
    > buffer_mapped.

    Can't be done.

    A up-to-date but non-mapped buffer is a perfectly valid thing to have -
    it's just a hole.

    So we can't mark the buffer uptodate before marking it mapped - that would
    be a totally different state.


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