Re: [PATCH v3 18/49] block: introduce multipage/single page bvec helpers

[Christoph Hellwig]

Please skip adding the _sp names for the single page ones - those
are the only used to implement the non postfixed ones anyway.

The _mp ones should have bio_iter_segment_* names instead.

And while you're at it - I think this code would massively benefit
from turning it into inline functions in a prep step before doing these
changes, including passing the iter by reference for all these functions
instead of the odd by value calling convention.