dm cache: simplify get_per_bio_data() by removing data_size argument

There is only one per_bio_data size now that writethrough-specific data
was removed from the per_bio_data structure.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2017-10-19 21:44:32 -04:00
commit 693b960ea8