ceph: expand Mon Pvc's

Expand Mon Pvc's if storage request has increased for the Mons in the
cephcluster crd.

Signed-off-by: Nitin Goyal <nigoyal@redhat.com>

pkg/operator/ceph/cluster/mon/mon.go

@@ -1179,6 +1179,20 @@ func (c *Cluster) commitMaxMonID(monName string) error {
 var updateDeploymentAndWait = UpdateCephDeploymentAndWait
 
 func (c *Cluster) updateMon(m *monConfig, d *apps.Deployment) error {
+	// Expand mon PVC if storage request for mon has increased in cephcluster crd
+	if c.monVolumeClaimTemplate(m) != nil {
+		desiredPvc, err := c.makeDeploymentPVC(m, false)
+		if err != nil {
+			return errors.Wrapf(err, "failed to make mon %q pvc", d.Name)
+		}
+
+		existingPvc, err := c.context.Clientset.CoreV1().PersistentVolumeClaims(c.Namespace).Get(context.TODO(), m.ResourceName, metav1.GetOptions{})
+		if err != nil {
+			return errors.Wrapf(err, "failed to fetch pvc for mon %q", m.ResourceName)
+		}
+		k8sutil.ExpandPVCIfRequired(c.context.Client, desiredPvc, existingPvc)
+	}
+
 	logger.Infof("deployment for mon %s already exists. updating if needed",
 		d.Name)
 

pkg/operator/ceph/cluster/mon/spec.go

@@ -30,6 +30,7 @@ import (
 	"github.com/rook/rook/pkg/operator/k8sutil"
 	apps "k8s.io/api/apps/v1"
 	corev1 "k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -49,8 +50,11 @@ func (c *Cluster) getLabels(monConfig *monConfig, canary, includeNewLabels bool)
 		labels["mon_canary"] = "true"
 	}
 	if includeNewLabels {
-		if c.monVolumeClaimTemplate(monConfig) != nil {
+		monVolumeClaimTemplate := c.monVolumeClaimTemplate(monConfig)
+		if monVolumeClaimTemplate != nil {
+			size := monVolumeClaimTemplate.Spec.Resources.Requests[v1.ResourceStorage]
 			labels["pvc_name"] = monConfig.ResourceName
+			labels["pvc_size"] = size.String()
 		}
 		if monConfig.Zone != "" {
 			labels["stretch-zone"] = monConfig.Zone