Add support for identifying device path of attached volume on XenServer

Author: Pearl1594

cmd/cloudstack-csi-driver/Dockerfile

@@ -14,7 +14,9 @@ RUN apk add --no-cache \
     # blkid, mount and umount are required by k8s.io/mount-utils \
     blkid \
     mount \
-    umount
+    umount \
+    # Provides udevadm for device path detection
+    udev 
 
 COPY ./bin/cloudstack-csi-driver /cloudstack-csi-driver
 ENTRYPOINT ["/cloudstack-csi-driver"]

deploy/k8s/node-daemonset.yaml

@@ -64,6 +64,8 @@ spec:
               mountPath: /dev
             - name: cloud-init-dir
               mountPath: /run/cloud-init/
+            - name: sys-dir
+              mountPath: /sys  
             # Comment the above 2 lines and uncomment the next 2 lines for Ignition support
             # - name: ignition-dir
             #   mountPath: /run/metadata
@@ -177,6 +179,10 @@ spec:
           hostPath:
             path: /run/cloud-init/
             type: Directory
+        - name: sys-dir
+          hostPath:
+            path: /sys
+            type: Directory    
         # Comment the above 4 lines and uncomment the next 4 lines for Ignition support
         # - name: ignition-dir
         #   hostPath:

pkg/mount/mount.go

@@ -80,9 +80,9 @@ func (m *mounter) GetBlockSizeBytes(devicePath string) (int64, error) {
 
 func (m *mounter) GetDevicePath(ctx context.Context, volumeID string) (string, error) {
 	backoff := wait.Backoff{
-		Duration: 1 * time.Second,
-		Factor:   1.1,
-		Steps:    15,
+		Duration: 2 * time.Second,
+		Factor:   1.5,
+		Steps:    20,
 	}
 
 	var devicePath string
@@ -111,6 +111,15 @@ func (m *mounter) GetDevicePath(ctx context.Context, volumeID string) (string, e
 }
 
 func (m *mounter) getDevicePathBySerialID(volumeID string) (string, error) {
+	// First try XenServer device paths
+	xenDevicePath, err := m.getDevicePathForXenServer(volumeID)
+	if err != nil {
+		fmt.Printf("Failed to get VMware device path: %v\n", err)
+	}
+	if xenDevicePath != "" {
+		return xenDevicePath, nil
+	}
+
 	// Try VMware device paths
 	vmwareDevicePath, err := m.getDevicePathForVMware(volumeID)
 	if err != nil {
@@ -129,13 +138,60 @@ func (m *mounter) getDevicePathBySerialID(volumeID string) (string, error) {
 			return source, nil
 		}
 		if !os.IsNotExist(err) {
+			fmt.Printf("Not found: %s\n", err.Error())
 			return "", err
 		}
 	}
 
 	return "", nil
 }
 
+func (m *mounter) getDevicePathForXenServer(volumeID string) (string, error) {
+	for i := 'b'; i <= 'z'; i++ {
+		devicePath := fmt.Sprintf("/dev/xvd%c", i)
+		fmt.Printf("Checking XenServer device path: %s\n", devicePath)
+
+		if _, err := os.Stat(devicePath); err == nil {
+			isBlock, err := m.IsBlockDevice(devicePath)
+			if err == nil && isBlock {
+				if m.verifyXenServerDevice(devicePath, volumeID) {
+					fmt.Printf("Found and verified XenServer device: %s\n", devicePath)
+					return devicePath, nil
+				}
+			}
+		}
+	}
+	return "", fmt.Errorf("device not found for volume %s", volumeID)
+}
+
+func (m *mounter) verifyXenServerDevice(devicePath string, volumeID string) bool {
+	size, err := m.GetBlockSizeBytes(devicePath)
+	if err != nil {
+		fmt.Printf("Failed to get device size: %v\n", err)
+		return false
+	}
+	fmt.Printf("Device size: %d bytes\n", size)
+
+	mounted, err := m.isDeviceMounted(devicePath)
+	if err != nil {
+		fmt.Printf("Failed to check if device is mounted: %v\n", err)
+		return false
+	}
+	if mounted {
+		fmt.Printf("Device is already mounted: %s\n", devicePath)
+		return false
+	}
+
+	props, err := m.getDeviceProperties(devicePath)
+	if err != nil {
+		fmt.Printf("Failed to get device properties: %v\n", err)
+		return false
+	}
+	fmt.Printf("Device properties: %v\n", props)
+
+	return true
+}
+
 func (m *mounter) getDevicePathForVMware(volumeID string) (string, error) {
 	// Loop through /dev/sdb to /dev/sdz (/dev/sda -> the root disk)
 	for i := 'b'; i <= 'z'; i++ {