Monitor: set err on arrays not in mdstat

mse can be NULL when the array was not in mdstat when we read it
but existed in statelist and was recreated after reading mdstat.
In this case we set err as we can't get full update on this array
this time.
If the same array is given twice in command line it appears twice
in statelist. The first one will mark mse->devnum=INT_MAX
so the second one can't find mse. We set err on the second one as
it's not needed. Also if it becomes degraded we would look for spares
twice for the same array.

Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 12 insertions, 11 deletions

diff --git a/Monitor.c b/Monitor.c
index fa275126..c4256815 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -271,6 +271,14 @@ int Monitor(struct mddev_dev *devlist,
 					mse = mse2;
 				}
 
+			if (!mse) {
+				/* duplicated array in statelist
+				 * or re-created after reading mdstat*/
+				st->err = 1;
+				close(fd);
+				continue;
+			}
+			/* this array is in /proc/mdstat */
 			if (array.utime == 0)
 				/* external arrays don't update utime */
 				array.utime = time(0);
@@ -287,7 +295,6 @@ int Monitor(struct mddev_dev *devlist,
 				continue;
 			}
 			if (st->utime == 0 && /* new array */
-			    mse &&	/* is in /proc/mdstat */
 			    mse->pattern && strchr(mse->pattern, '_') /* degraded */
 				)
 				alert("DegradedArray", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
@@ -296,12 +303,10 @@ int Monitor(struct mddev_dev *devlist,
 			    st->expected_spares > 0 &&
 			    array.spare_disks < st->expected_spares)
 				alert("SparesMissing", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
-			if (mse &&
-			    st->percent == -1 &&
+			if (st->percent == -1 &&
 			    mse->percent >= 0)
 				alert("RebuildStarted", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
-			if (mse &&
-			    st->percent >= 0 &&
+			if (st->percent >= 0 &&
 			    mse->percent >= 0 &&
 			    (mse->percent / increments) > (st->percent / increments)) {
 				char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
@@ -315,8 +320,7 @@ int Monitor(struct mddev_dev *devlist,
 				      dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 			}
 
-			if (mse &&
-			    mse->percent == -1 &&
+			if (mse->percent == -1 &&
 			    st->percent >= 0) {
 				/* Rebuild/sync/whatever just finished.
 				 * If there is a number in /mismatch_cnt,
@@ -333,10 +337,7 @@ int Monitor(struct mddev_dev *devlist,
 				if (sra)
 					free(sra);
 			}
-
-			if (mse)
-				st->percent = mse->percent;
-
+			st->percent = mse->percent;
 
 			for (i=0; i<MaxDisks && i <= array.raid_disks + array.nr_disks;
 			     i++) {