Hi Neil, hi Shaohua, This is a follow-up about the problem we reported 2 months ago about RAID1: https://www.spinics.net/lists/raid/msg61292.html We sent RFC off list in the past, now bring it to the list as Neil requested, sorry for being slow. I've rebased the patch to 4.19-rc8, run some basic regression test, works fine. Thanks, Jack Wang Linux Kernel Developer ProfitBricks GmbH Florian-Ewald Mueller (1): md/raid1: IO write serialization per chunks drivers/md/Kconfig | 10 + drivers/md/raid1-ioser.c | 673 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/md/raid1.c | 36 +++ drivers/md/raid1.h | 82 ++++++ 4 files changed, 801 insertions(+) create mode 100644 drivers/md/raid1-ioser.c -- 2.7.4