2 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/md-cluster.txt b/Documentation/md-cluster.txt
index c100c7163507..38883276d31c 100644
--- a/Documentation/md-cluster.txt
+++ b/Documentation/md-cluster.txt
@@ -316,3 +316,9 @@ The algorithm is:
  nodes are using the raid which is achieved by lock all bitmap
  locks within the cluster, and also those locks are unlocked
  accordingly.
+
+7. Unsupported features
+
+There are somethings which are not supported by cluster MD yet.
+
+- update size and change array_sectors.
diff --git a/drivers/md/md.c b/drivers/md/md.c
index dd83a50d892c..8cc4bbcf9bf8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4817,6 +4817,10 @@ array_size_store(struct mddev *mddev, const char *buf, size_t len)
         if (err)
                 return err;
 
+        /* cluster raid doesn't support change array_sectors */
+        if (mddev_is_clustered(mddev))
+                return -EINVAL;
+
         if (strncmp(buf, "default", 7) == 0) {
                 if (mddev->pers)
                         sectors = mddev->pers->size(mddev, 0, 0);
@@ -6438,6 +6442,10 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
         int rv;
         int fit = (num_sectors == 0);
 
+        /* cluster raid doesn't support update size */
+        if (mddev_is_clustered(mddev))
+                return -EINVAL;
+
         if (mddev->pers->resize == NULL)
                 return -EINVAL;
         /* The "num_sectors" is the number of sectors of each device that