On Tue, Aug 08, 2017 at 04:45:18PM +0800, Ming Lei wrote:

This patch implements singlepage version of the following
3 helpers:
	- bvec_iter_offset_sp()
	- bvec_iter_len_sp()
	- bvec_iter_page_sp()

So that one multipage bvec can be splited to singlepage
bvec, and make users of current bvec iterator happy.

Please merge this into the previous patch, and keep the existing
non postfixed names for the single page version, and use
bvec_iter_segment_* for the multipage versions.