From: NeilBrown <neilb@suse.de>
Date: Wed, 30 Apr 2008 07:52:28 +0000 (-0700)
Subject: md: skip all metadata update processing when using external metadata.
X-Git-Tag: firefly_0821_release~20799
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8377bc808029251c2c0f52116cf87d80291b25bf;p=firefly-linux-kernel-4.4.55.git

md: skip all metadata update processing when using external metadata.

All the metadata update processing for external metadata is on in user-space
or through the sysfs interfaces, so make "md_update_sb" a no-op in that case.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 11457a28a14c..61767f1962eb 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1652,6 +1652,8 @@ static void md_update_sb(mddev_t * mddev, int force_change)
 	int sync_req;
 	int nospares = 0;
 
+	if (mddev->external)
+		return;
 repeat:
 	spin_lock_irq(&mddev->write_lock);