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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.

Linus

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