From: Shaohua Li <shli@fb.com>
Date: Mon, 21 Nov 2016 18:29:19 +0000 (-0800)
Subject: md: stop write should stop journal reclaim
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=034e33f5eda3c61edb838471f69ec42d64e1e94e;p=linux-beck.git

md: stop write should stop journal reclaim

__md_stop_writes currently doesn't stop raid5-cache reclaim thread. It's
possible the reclaim thread is still running and doing write, which
doesn't match what __md_stop_writes should do. The extra ->quiesce()
call should not harm any raid types. For raid5-cache, this will
guarantee we reclaim all caches before we update superblock.

Signed-off-by: Shaohua Li <shli@fb.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Cc: Song Liu <songliubraving@fb.com>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 297757a0ec0c..c7894fbbd8e5 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5517,6 +5517,10 @@ static void __md_stop_writes(struct mddev *mddev)
 
 	del_timer_sync(&mddev->safemode_timer);
 
+	if (mddev->pers && mddev->pers->quiesce) {
+		mddev->pers->quiesce(mddev, 1);
+		mddev->pers->quiesce(mddev, 0);
+	}
 	bitmap_flush(mddev);
 
 	if (mddev->ro == 0 &&