mdmon: when a reshape is detected, add any newly added devices to the array.

When mdadm starts a reshape, it might add some devices to the array
first.  mdmon needs to notice the reshape starting and check for any
new devices.  If there are any they need to be provided to be
monitored.

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

1 files changed, 15 insertions, 2 deletions

diff --git a/monitor.c b/monitor.c
index f166bc8..f566890 100644
--- a/monitor.c
+++ b/monitor.c
@@ -215,6 +215,7 @@ static int read_and_act(struct active_array *a)
 {
 	unsigned long long sync_completed;
 	int check_degraded = 0;
+	int check_reshape = 0;
 	int deactivate = 0;
 	struct mdinfo *mdi;
 	int dirty = 0;
@@ -305,6 +306,15 @@ static int read_and_act(struct active_array *a)
 		}
 	}
 
+	if (!deactivate &&
+	    a->curr_action == reshape &&
+	    a->prev_action != reshape)
+		/* reshape was requested by mdadm.  Need to see if
+		 * new devices have been added.  Manager does that
+		 * when it sees check_reshape
+		 */
+		check_reshape = 1;
+
 	/* Check for failures and if found:
 	 * 1/ Record the failure in the metadata and unblock the device.
 	 *    FIXME update the kernel to stop notifying on failed drives when
@@ -393,9 +403,12 @@ static int read_and_act(struct active_array *a)
 		mdi->next_state = 0;
 	}
 
-	if (check_degraded) {
+	if (check_degraded || check_reshape) {
 		/* manager will do the actual check */
-		a->check_degraded = 1;
+		if (check_degraded)
+			a->check_degraded = 1;
+		if (check_reshape)
+			a->check_reshape = 1;
 		signal_manager();
 	}