From: NeilBrown <neilb@suse.de>
Date: Wed, 27 Mar 2013 05:51:09 +0000 (+1100)
Subject: md: don't update metadata when stopping a read-only array.
X-Git-Tag: next-20130402~51^2~4
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3b8fb1d91daacc6c15bc3240d73be074e074d50b;p=karo-tx-linux.git

md: don't update metadata when stopping a read-only array.

read-only arrays should stay that way as much as possible.
Updating the metadata - which could be triggered by a re-add
while assembling the array metadata - should be avoided.

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 491afda21fd9..30132280d07b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5293,7 +5293,8 @@ static void __md_stop_writes(struct mddev *mddev)
 	bitmap_flush(mddev);
 	md_super_wait(mddev);
 
-	if (!mddev->in_sync || mddev->flags) {
+	if (mddev->ro == 0 &&
+	    (!mddev->in_sync || mddev->flags)) {
 		/* mark array as shutdown cleanly */
 		mddev->in_sync = 1;
 		md_update_sb(mddev, 1);