Ming Lei cacc7b0556 dm io: use bvec iterator helpers to implement .get_page and .next_page ...

Firstly we have mature bvec/bio iterator helper for iterate each
page in one bio, not necessary to reinvent a wheel to do that.

Secondly the coming multipage bvecs requires this patch.

Also add comments about the direct access to bvec table.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

2016-11-21 09:51:57 -05:00

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