fix: prevent CSI node from deleting DaemonSet mount pods

DaemonSet mount pods should be managed by the DaemonSet controller,
not deleted by the CSI node reconciler when they have no references.
The CSI node should only add/remove client references (connect/disconnect).

This fixes the recreation loop where CSI nodes were continuously trying
to delete DaemonSet pods that had no references, causing the reconciler
to report errors every 5 seconds.

Added isDaemonSetPod() helper to identify DaemonSet-managed pods by:
- Checking OwnerReferences for DaemonSet ownership
- Checking pod name pattern for "-mount-ds-" suffix (backward compatibility)

Author: elijah-rou

pkg/controller/pod_driver.go

@@ -180,6 +180,22 @@ func getPodStatus(pod *corev1.Pod) podStatus {
 	return podPending
 }
 
+// isDaemonSetPod checks if a pod is managed by a DaemonSet
+func isDaemonSetPod(pod *corev1.Pod) bool {
+	// Check if pod is owned by a DaemonSet
+	for _, owner := range pod.OwnerReferences {
+		if owner.Kind == "DaemonSet" {
+			return true
+		}
+	}
+	// Also check if pod name matches DaemonSet pattern (for backward compatibility)
+	// DaemonSet mount pods have names like "juicefs-<uniqueid>-mount-ds-<suffix>"
+	if strings.Contains(pod.Name, "-mount-ds-") {
+		return true
+	}
+	return false
+}
+
 // checkAnnotations
 // 1. check refs in mount pod annotation
 // 2. delete ref that target pod is not found
@@ -227,6 +243,14 @@ func (p *PodDriver) checkAnnotations(ctx context.Context, pod *corev1.Pod) error
 		}
 	}
 	if existTargets == 0 && pod.DeletionTimestamp == nil {
+		// Check if this is a DaemonSet pod - they should not be deleted when they have no refs
+		// DaemonSet pods are managed by the DaemonSet controller
+		if isDaemonSetPod(pod) {
+			// Skip DaemonSet pods - they're managed by the DaemonSet controller
+			// No need to log or return error, just skip processing
+			return nil
+		}
+		
 		var shouldDelay bool
 		shouldDelay, err := resource.ShouldDelay(ctx, pod, p.Client)
 		if err != nil {