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Eric W. Biederman writes:

> This is something I'm stumbling over porting patches for large
> files in the page cache from 2.2.5 to to 2.3.3.
> Non-page cache aligned mappings sound great until you
> (a) squeeze the extra bits out of the vm_offset and make it an index
> into the page cache, and
> (b) realize you need more bits to say how far you are into a page.

You stole too many bits then. Just take 9, giving sector-sized alignment.

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