From: NeilBrown <neilb@suse.de>
Date: Mon, 22 Mar 2010 05:53:49 +0000 (+1100)
Subject: md: add support for raid5 to raid4 conversion
X-Git-Tag: v4.13~18970^2~29
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=a78d38a1a16c8e009aa512caa71d483757fefc1c;p=mirror_ubuntu-bionic-kernel.git

md: add support for raid5 to raid4 conversion

This is unlikely to be wanted, but we may as well provide it
for completeness.

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

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index bb28fd6b44fe..020143dec180 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5788,6 +5788,18 @@ static void *raid5_takeover(mddev_t *mddev)
 	return ERR_PTR(-EINVAL);
 }
 
+static void *raid4_takeover(mddev_t *mddev)
+{
+	/* raid4 can take over raid5 if layout is right.
+	 */
+	if (mddev->level == 5 &&
+	    mddev->layout == ALGORITHM_PARITY_N) {
+		mddev->new_layout = 0;
+		mddev->new_level = 4;
+		return setup_conf(mddev);
+	}
+	return ERR_PTR(-EINVAL);
+}
 
 static struct mdk_personality raid5_personality;
 
@@ -5903,6 +5915,7 @@ static struct mdk_personality raid4_personality =
 	.start_reshape  = raid5_start_reshape,
 	.finish_reshape = raid5_finish_reshape,
 	.quiesce	= raid5_quiesce,
+	.takeover	= raid4_takeover,
 };
 
 static int __init raid5_init(void)