[PATCH 24/32] dm: pass dm stats data dir instead of bi_rw

From: Mike Christie It looks like dm stats primarily cares about the data direction (READ vs WRITE) and does not need the bio/request flags and in the future operation value. REQ_DISCARD is always set with REQ_WRITE, so the check for either one in dm_stats_account_io is not needed. This patch

[PATCH 24/32] dm: pass dm stats data dir instead of bi_rw

From: Mike Christie It looks like dm stats primarily cares about the data direction (READ vs WRITE) and does not need the bio/request flags and in the future operation value. REQ_DISCARD is always set with REQ_WRITE, so the check for either one in dm_stats_account_io is not