Flush mdmon before next reshape step during container operation

Using takeover operation for grow purposes, mdadm has to be sure
that mdmon processes all updates, and if necessary it will be closed
at takeover to raid0 operation. If mdmon is late, next array in container
is processed and due to race condition mdmon closes itself instead to monitor
next reshape operation.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/msg.c b/msg.c
index dc780b3e..44aad1f6 100644
--- a/msg.c
+++ b/msg.c
@@ -487,3 +487,13 @@ int ping_manager(char *devname)
 	close(sfd);
 	return err;
 }
+
+/* using takeover operation for grow purposes, mdadm has to be sure
+ * that mdmon processes all updates, and if necessary it will be closed
+ * at takeover to raid0 operation
+  */
+void flush_mdmon(char *container)
+{
+	ping_manager(container);
+	ping_monitor(container);
+}