From: NeilBrown <neilb@suse.de>
Date: Tue, 31 Mar 2009 03:57:09 +0000 (+1100)
Subject: md: add takeover support for raid4 -> raid5 conversion.
X-Git-Tag: firefly_0821_release~14816^2~23
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e9d4758f6e93488dc719a1445ce54659a570938f;p=firefly-linux-kernel-4.4.55.git

md: add takeover support for raid4 -> raid5 conversion.

Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 8a5e14e4a851..95953273c4d9 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4967,6 +4967,11 @@ static void *raid5_takeover(mddev_t *mddev)
 
 	if (mddev->level == 1)
 		return raid5_takeover_raid1(mddev);
+	if (mddev->level == 4) {
+		mddev->new_layout = ALGORITHM_PARITY_N;
+		mddev->new_level = 5;
+		return setup_conf(mddev);
+	}
 
 	return ERR_PTR(-EINVAL);
 }