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SubjectRe: [PATCH v2] block: make sure big bio is splitted into at most 256 bvecs
On Fri, Jun 10, 2016 at 01:37:17PM +0200, Hannes Reinecke wrote:
> Hmm. So everybody is suffering because someone _might_ be using bio_clone?
> Why can't we fixup bio_clone() (or the callers of which) to correctly
> set the queue limits?

The only one suffering is bcache. Everyone else uses bios below the
block layer arbitrary max size. The fixup to allow bio_clone support
a larger size is the same one as to allow everyone else submitting
larger bios: increase BIO_MAX_PAGES and create the required mempools
to back that new larger size. Or just go for multipage biovecs..

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