nfs: only set the pool size when it exists

For CRD not using the new nfs spec that includes the pool settings,
applying the "size" property won't work since it is set to 0. The pool
still gets created but returns an error. The loop is re-queued but on
the second run the pool is detected so no further configuration is done.

Closes: https://github.com/rook/rook/issues/9205
Signed-off-by: Sébastien Han <seb@redhat.com>

pkg/daemon/ceph/client/pool.go

@@ -408,8 +408,11 @@ func CreateReplicatedPoolForApp(context *clusterd.Context, clusterInfo *ClusterI
 
 	if !clusterSpec.IsStretchCluster() {
 		// the pool is type replicated, set the size for the pool now that it's been created
-		if err := SetPoolReplicatedSizeProperty(context, clusterInfo, poolName, strconv.FormatUint(uint64(pool.Replicated.Size), 10)); err != nil {
-			return errors.Wrapf(err, "failed to set size property to replicated pool %q to %d", poolName, pool.Replicated.Size)
+		// Only set the size if not 0, otherwise ceph will fail to set size to 0
+		if pool.Replicated.Size > 0 {
+			if err := SetPoolReplicatedSizeProperty(context, clusterInfo, poolName, strconv.FormatUint(uint64(pool.Replicated.Size), 10)); err != nil {
+				return errors.Wrapf(err, "failed to set size property to replicated pool %q to %d", poolName, pool.Replicated.Size)
+			}
 		}
 	}