On Thu, Aug 11, 2016 at 10:02 PM, Christoph Hellwig [off-list ref] wrote:

Please just fix bcache to not submit bios larger than BIO_MAX_PAGES for
now, until we can support such callers in general and enable common
used code to do so.

IMO it can't be efficient to do that in bcache because it need to figure out
how many bvecs one bio includes.

This patch(block: make sure big bio is splitted into at most 256 bvecs)
can support such callers.

Also this kind of usage does simplify drivers.

Thanks,
Ming

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