Hi Song, Based on previous discussion, this set reverts current mechanism, then switches back to the v1 version from Artur. Also reuses the current clone infrastructer for mpath, raid1 and raid10. Thanks, Guoqing Guoqing Jiang (5): md: revert io stats accounting md: the latest try for improve io stats accounting md-multipath: enable io accounting md/raid1: enable io accounting md/raid10: enable io accounting drivers/md/md-multipath.c | 5 ++++ drivers/md/md-multipath.h | 1 + drivers/md/md.c | 63 ++++++++++++++++++++++----------------- drivers/md/md.h | 2 +- drivers/md/raid1.c | 11 +++++++ drivers/md/raid1.h | 1 + drivers/md/raid10.c | 7 +++++ drivers/md/raid10.h | 1 + 8 files changed, 62 insertions(+), 29 deletions(-) -- 2.25.1