rbd: set/get correct ImageID in more places

In some places the ImageID is used as the ID of the parent. That is very
confusing and prone to errors. Instead, fetch the right ImageID where
possible, and set ParentID for referencing to parent images.

Signed-off-by: Niels de Vos <ndevos@ibm.com>

internal/rbd/rbd_util.go

@@ -114,6 +114,8 @@ type rbdImage struct {
 	NamePrefix  string
 	// ParentName represents the parent image name of the image.
 	ParentName string
+	// ParentID represents the parent image ID of the image.
+	ParentID string
 	// Parent Pool is the pool that contains the parent image.
 	ParentPool string
 	// Cluster name
@@ -711,6 +713,7 @@ func (ri *rbdImage) getCloneDepth(ctx context.Context) (uint, error) {
 	vol.Pool = ri.Pool
 	vol.Monitors = ri.Monitors
 	vol.RbdImageName = ri.RbdImageName
+	vol.ImageID = ri.ImageID
 	vol.RadosNamespace = ri.RadosNamespace
 	vol.conn = ri.conn.Copy()
 
@@ -743,6 +746,7 @@ func (ri *rbdImage) getCloneDepth(ctx context.Context) (uint, error) {
 			depth++
 		}
 		vol.RbdImageName = vol.ParentName
+		vol.ImageID = vol.ParentID
 		vol.Pool = vol.ParentPool
 	}
 }
@@ -1595,6 +1599,11 @@ func (ri *rbdImage) getImageInfo() error {
 	// TODO: can rv.VolSize not be a uint64? Or initialize it to -1?
 	ri.VolSize = int64(imageInfo.Size)
 
+	ri.ImageID, err = image.GetId()
+	if err != nil {
+		return err
+	}
+
 	features, err := image.GetFeatures()
 	if err != nil {
 		return err
@@ -1608,11 +1617,13 @@ func (ri *rbdImage) getImageInfo() error {
 		// the parent is an error or not.
 		if errors.Is(err, librbd.ErrNotFound) {
 			ri.ParentName = ""
+			ri.ParentID = ""
 		} else {
 			return err
 		}
 	} else {
 		ri.ParentName = parentInfo.Image.ImageName
+		ri.ParentID = parentInfo.Image.ImageID
 		ri.ParentPool = parentInfo.Image.PoolName
 	}
 	// Get image creation time
@@ -1643,6 +1654,7 @@ func (ri *rbdImage) getParent() (*rbdImage, error) {
 	parentImage.Pool = ri.ParentPool
 	parentImage.RadosNamespace = ri.RadosNamespace
 	parentImage.RbdImageName = ri.ParentName
+	parentImage.ImageID = ri.ParentID
 
 	err = parentImage.getImageInfo()
 	if err != nil {
@@ -1699,6 +1711,7 @@ type rbdImageMetadataStash struct {
 	Pool           string `json:"pool"`
 	RadosNamespace string `json:"radosNamespace"`
 	ImageName      string `json:"image"`
+	ImageID        string `json:"imageID"`
 	UnmapOptions   string `json:"unmapOptions"`
 	NbdAccess      bool   `json:"accessType"`
 	Encrypted      bool   `json:"encrypted"`
@@ -1728,6 +1741,7 @@ func stashRBDImageMetadata(volOptions *rbdVolume, metaDataPath string) error {
 		Pool:           volOptions.Pool,
 		RadosNamespace: volOptions.RadosNamespace,
 		ImageName:      volOptions.RbdImageName,
+		ImageID:        volOptions.ImageID,
 		Encrypted:      volOptions.isBlockEncrypted(),
 		UnmapOptions:   volOptions.UnmapOptions,
 	}