# \[PATCH 0/2\] md/dm-raid: add/use API to switch raid4/5/6 journal cache modes

- From: \<hidden\>
- Date: 2017-03-22 16:44:21 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2017/03/6634938
- Thread: https://ratatoskr.run/linux-raid/2017/03/6634938/t.md

```text
From: Heinz Mauelshagen <redacted>

Upstream commit 7a771ceac771d009f7203c40b256b0608d7ea2f8 added
journal support to dm-raid to close the raid4/5/6 "write hole"
but doesn't provide an API to switch modes from device-mapper.

Add missing API to MD and use it from device-mapper dm-raid
thus supporting 'write-back' journal caching in the raid target.


Heinz Mauelshagen (2):
  md: add raid4/5/6 journal mode API (for dm-raid use)
  dm raid: add raid4/5/6 journal mode support

 Documentation/device-mapper/dm-raid.txt | 11 +++-
 drivers/md/dm-raid.c                    | 91 ++++++++++++++++++++++++++++-----
 drivers/md/raid5-cache.c                | 62 ++++++++++++----------
 drivers/md/raid5.h                      | 11 ++++
 4 files changed, 133 insertions(+), 42 deletions(-)

-- 
2.9.3

```