From 16a43f6a65002ba9a5b063764b4ad5d288a1c15e Mon Sep 17 00:00:00 2001
From: Shaohua Li <shli@fb.com>
Date: Wed, 6 Jan 2016 14:37:15 -0800
Subject: [PATCH] raid5-cache: handle journal hotadd in quiesce
Handle journal hotadd in quiesce to avoid creating duplicated threads.
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
---
drivers/md/raid5-cache.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 7ac035a73281c..9531f5f05b93d 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -827,6 +827,13 @@ void r5l_quiesce(struct r5l_log *log, int state)
return;
if (state == 0) {
log->in_teardown = 0;
+ /*
+ * This is a special case for hotadd. In suspend, the array has
+ * no journal. In resume, journal is initialized as well as the
+ * reclaim thread.
+ */
+ if (log->reclaim_thread)
+ return;
log->reclaim_thread = md_register_thread(r5l_reclaim_thread,
log->rdev->mddev, "reclaim");
} else if (state == 1) {
--
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