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SubjectRe: Zerocopy NBD
On Wed, May 30 2001, Steve Whitehouse wrote:
> + if (PageHighMem(page))
> + offset = (int)bh->b_data;
> + else
> + offset = (int)bh->b_data - (int)page_address(page);

Side note:

offset = bh_offset(bh);

will handle this nicely for you. No need for (nasty) casting and
checking for highmem pages.

--
Jens Axboe

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