On Wed, Aug 09, 2017 at 08:06:24PM -0700, Dan Williams wrote:
> I like it, but do you think we should switch to sbvec[<constant>] to
> preclude pathological cases where nr_pages is large?

Yes, please.

Then I'd like to see that the on-stack bio even matters for
mpage_readpage / mpage_writepage.  Compared to all the buffer head
overhead the bio allocation should not actually matter in practice.
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