rbd: implement GetMirrorSource in manager

implementing GetMirrorSource in manager
to return volume or the volumegroup based
on the replication source, if replication
source is nil return the volume details
for backward compatibility.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

internal/csi-addons/rbd/replication.go

@@ -257,9 +257,9 @@ func validateSchedulingInterval(interval string) error {
 func (rs *ReplicationServer) EnableVolumeReplication(ctx context.Context,
 	req *replication.EnableVolumeReplicationRequest,
 ) (*replication.EnableVolumeReplicationResponse, error) {
-	volumeID := csicommon.GetIDFromReplication(req)
-	if volumeID == "" {
-		return nil, status.Error(codes.InvalidArgument, "empty volume ID in request")
+	reqID := csicommon.GetIDFromReplication(req)
+	if reqID == "" {
+		return nil, status.Error(codes.InvalidArgument, "empty ID in request")
 	}
 	cr, err := util.NewUserCredentials(req.GetSecrets())
 	if err != nil {
@@ -272,24 +272,21 @@ func (rs *ReplicationServer) EnableVolumeReplication(ctx context.Context,
 		return nil, err
 	}
 
-	if acquired := rs.VolumeLocks.TryAcquire(volumeID); !acquired {
-		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volumeID)
+	if acquired := rs.VolumeLocks.TryAcquire(reqID); !acquired {
+		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, reqID)
 
-		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volumeID)
+		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, reqID)
 	}
-	defer rs.VolumeLocks.Release(volumeID)
+	defer rs.VolumeLocks.Release(reqID)
 
 	mgr := rbd.NewManager(rs.csiID, req.GetParameters(), req.GetSecrets())
 	defer mgr.Destroy(ctx)
 
-	rbdVol, err := mgr.GetVolumeByID(ctx, volumeID)
+	volumes, mirror, err := mgr.GetMirrorSource(ctx, reqID, req.GetReplicationSource())
 	if err != nil {
 		return nil, getGRPCError(err)
 	}
-	mirror, err := rbdVol.ToMirror()
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
-	}
+	defer destoryVolumes(ctx, volumes)
 
 	// extract the mirroring mode
 	mirroringMode, err := getMirroringMode(ctx, req.GetParameters())
@@ -309,17 +306,18 @@ func (rs *ReplicationServer) EnableVolumeReplication(ctx context.Context,
 		return nil, status.Error(codes.Internal, err.Error())
 	}
 	if info.GetState() != librbd.MirrorImageEnabled.String() {
-		err = rbdVol.HandleParentImageExistence(ctx, flattenMode)
-		if err != nil {
-			log.ErrorLog(ctx, err.Error())
+		for _, rbdVol := range volumes {
+			err = rbdVol.HandleParentImageExistence(ctx, flattenMode)
+			if err != nil {
+				err = fmt.Errorf("failed to handle parent image for volume group %q: %w", mirror, err)
+				return nil, getGRPCError(err)
+			}
+			err = mirror.EnableMirroring(ctx, mirroringMode)
+			if err != nil {
+				log.ErrorLog(ctx, err.Error())
 
-			return nil, getGRPCError(err)
-		}
-		err = mirror.EnableMirroring(ctx, mirroringMode)
-		if err != nil {
-			log.ErrorLog(ctx, err.Error())
-
-			return nil, status.Error(codes.Internal, err.Error())
+				return nil, status.Error(codes.Internal, err.Error())
+			}
 		}
 	}
 
@@ -332,9 +330,9 @@ func (rs *ReplicationServer) EnableVolumeReplication(ctx context.Context,
 func (rs *ReplicationServer) DisableVolumeReplication(ctx context.Context,
 	req *replication.DisableVolumeReplicationRequest,
 ) (*replication.DisableVolumeReplicationResponse, error) {
-	volumeID := csicommon.GetIDFromReplication(req)
-	if volumeID == "" {
-		return nil, status.Error(codes.InvalidArgument, "empty volume ID in request")
+	reqID := csicommon.GetIDFromReplication(req)
+	if reqID == "" {
+		return nil, status.Error(codes.InvalidArgument, "empty ID in request")
 	}
 	cr, err := util.NewUserCredentials(req.GetSecrets())
 	if err != nil {
@@ -342,24 +340,21 @@ func (rs *ReplicationServer) DisableVolumeReplication(ctx context.Context,
 	}
 	defer cr.DeleteCredentials()
 
-	if acquired := rs.VolumeLocks.TryAcquire(volumeID); !acquired {
-		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volumeID)
+	if acquired := rs.VolumeLocks.TryAcquire(reqID); !acquired {
+		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, reqID)
 
-		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volumeID)
+		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, reqID)
 	}
-	defer rs.VolumeLocks.Release(volumeID)
+	defer rs.VolumeLocks.Release(reqID)
 
 	mgr := rbd.NewManager(rs.csiID, req.GetParameters(), req.GetSecrets())
 	defer mgr.Destroy(ctx)
 
-	rbdVol, err := mgr.GetVolumeByID(ctx, volumeID)
+	volumes, mirror, err := mgr.GetMirrorSource(ctx, reqID, req.GetReplicationSource())
 	if err != nil {
 		return nil, getGRPCError(err)
 	}
-	mirror, err := rbdVol.ToMirror()
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
-	}
+	defer destoryVolumes(ctx, volumes)
 
 	// extract the force option
 	force, err := getForceOption(ctx, req.GetParameters())
@@ -378,7 +373,7 @@ func (rs *ReplicationServer) DisableVolumeReplication(ctx context.Context,
 	case librbd.MirrorImageDisabled.String():
 	// image mirroring is still disabling
 	case librbd.MirrorImageDisabling.String():
-		return nil, status.Errorf(codes.Aborted, "%s is in disabling state", volumeID)
+		return nil, status.Errorf(codes.Aborted, "%s is in disabling state", reqID)
 	case librbd.MirrorImageEnabled.String():
 		err = corerbd.DisableVolumeReplication(mirror, ctx, info.IsPrimary(), force)
 		if err != nil {
@@ -400,9 +395,9 @@ func (rs *ReplicationServer) DisableVolumeReplication(ctx context.Context,
 func (rs *ReplicationServer) PromoteVolume(ctx context.Context,
 	req *replication.PromoteVolumeRequest,
 ) (*replication.PromoteVolumeResponse, error) {
-	volumeID := csicommon.GetIDFromReplication(req)
-	if volumeID == "" {
-		return nil, status.Error(codes.InvalidArgument, "empty volume ID in request")
+	reqID := csicommon.GetIDFromReplication(req)
+	if reqID == "" {
+		return nil, status.Error(codes.InvalidArgument, "empty ID in request")
 	}
 	cr, err := util.NewUserCredentials(req.GetSecrets())
 	if err != nil {
@@ -410,24 +405,21 @@ func (rs *ReplicationServer) PromoteVolume(ctx context.Context,
 	}
 	defer cr.DeleteCredentials()
 
-	if acquired := rs.VolumeLocks.TryAcquire(volumeID); !acquired {
-		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volumeID)
+	if acquired := rs.VolumeLocks.TryAcquire(reqID); !acquired {
+		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, reqID)
 
-		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volumeID)
+		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, reqID)
 	}
-	defer rs.VolumeLocks.Release(volumeID)
+	defer rs.VolumeLocks.Release(reqID)
 
 	mgr := rbd.NewManager(rs.csiID, req.GetParameters(), req.GetSecrets())
 	defer mgr.Destroy(ctx)
 
-	rbdVol, err := mgr.GetVolumeByID(ctx, volumeID)
+	volumes, mirror, err := mgr.GetMirrorSource(ctx, reqID, req.GetReplicationSource())
 	if err != nil {
 		return nil, getGRPCError(err)
 	}
-	mirror, err := rbdVol.ToMirror()
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
-	}
+	defer destoryVolumes(ctx, volumes)
 
 	info, err := mirror.GetMirroringInfo(ctx)
 	if err != nil {
@@ -440,7 +432,7 @@ func (rs *ReplicationServer) PromoteVolume(ctx context.Context,
 		return nil, status.Errorf(
 			codes.InvalidArgument,
 			"mirroring is not enabled on %s, image is in %s Mode",
-			volumeID,
+			reqID,
 			info.GetState())
 	}
 
@@ -477,10 +469,10 @@ func (rs *ReplicationServer) PromoteVolume(ctx context.Context,
 		}
 		log.DebugLog(
 			ctx,
-			"Added scheduling at interval %s, start time %s for volume %s",
+			"Added scheduling at interval %s, start time %s for Id %s",
 			interval,
 			startTime,
-			rbdVol)
+			reqID)
 	}
 
 	return &replication.PromoteVolumeResponse{}, nil
@@ -493,9 +485,9 @@ func (rs *ReplicationServer) PromoteVolume(ctx context.Context,
 func (rs *ReplicationServer) DemoteVolume(ctx context.Context,
 	req *replication.DemoteVolumeRequest,
 ) (*replication.DemoteVolumeResponse, error) {
-	volumeID := csicommon.GetIDFromReplication(req)
-	if volumeID == "" {
-		return nil, status.Error(codes.InvalidArgument, "empty volume ID in request")
+	reqID := csicommon.GetIDFromReplication(req)
+	if reqID == "" {
+		return nil, status.Error(codes.InvalidArgument, "empty ID in request")
 	}
 	cr, err := util.NewUserCredentials(req.GetSecrets())
 	if err != nil {
@@ -503,31 +495,21 @@ func (rs *ReplicationServer) DemoteVolume(ctx context.Context,
 	}
 	defer cr.DeleteCredentials()
 
-	if acquired := rs.VolumeLocks.TryAcquire(volumeID); !acquired {
-		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volumeID)
+	if acquired := rs.VolumeLocks.TryAcquire(reqID); !acquired {
+		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, reqID)
 
-		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volumeID)
+		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, reqID)
 	}
-	defer rs.VolumeLocks.Release(volumeID)
+	defer rs.VolumeLocks.Release(reqID)
 
 	mgr := rbd.NewManager(rs.csiID, req.GetParameters(), req.GetSecrets())
 	defer mgr.Destroy(ctx)
 
-	rbdVol, err := mgr.GetVolumeByID(ctx, volumeID)
+	volumes, mirror, err := mgr.GetMirrorSource(ctx, reqID, req.GetReplicationSource())
 	if err != nil {
 		return nil, getGRPCError(err)
 	}
-	mirror, err := rbdVol.ToMirror()
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
-	}
-
-	creationTime, err := rbdVol.GetCreationTime(ctx)
-	if err != nil {
-		log.ErrorLog(ctx, err.Error())
-
-		return nil, status.Error(codes.Internal, err.Error())
-	}
+	defer destoryVolumes(ctx, volumes)
 
 	info, err := mirror.GetMirroringInfo(ctx)
 	if err != nil {
@@ -540,24 +522,33 @@ func (rs *ReplicationServer) DemoteVolume(ctx context.Context,
 		return nil, status.Errorf(
 			codes.InvalidArgument,
 			"mirroring is not enabled on %s, image is in %s Mode",
-			volumeID,
+			reqID,
 			info.GetState())
 	}
 
 	// demote image to secondary
 	if info.IsPrimary() {
-		// store the image creation time for resync
-		_, err = rbdVol.GetMetadata(imageCreationTimeKey)
-		if err != nil && errors.Is(err, librbd.ErrNotFound) {
-			log.DebugLog(ctx, "setting image creation time %s for %s", creationTime, rbdVol)
-			err = rbdVol.SetMetadata(imageCreationTimeKey, timestampToString(creationTime))
-		}
-		if err != nil {
-			log.ErrorLog(ctx, err.Error())
+		for _, vol := range volumes {
+			// store the image creation time for resync
+			creationTime, cErr := vol.GetCreationTime(ctx)
+			if cErr != nil {
+				log.ErrorLog(ctx, cErr.Error())
 
-			return nil, status.Error(codes.Internal, err.Error())
-		}
+				return nil, status.Error(codes.Internal, cErr.Error())
+			}
 
+			// store the image creation time for resync
+			_, err = vol.GetMetadata(imageCreationTimeKey)
+			if err != nil && errors.Is(err, librbd.ErrNotFound) {
+				log.DebugLog(ctx, "setting image creation time %s for %s", creationTime, vol)
+				err = vol.SetMetadata(imageCreationTimeKey, timestampToString(creationTime))
+			}
+			if err != nil {
+				log.ErrorLog(ctx, err.Error())
+
+				return nil, status.Error(codes.Internal, err.Error())
+			}
+		}
 		err = mirror.Demote(ctx)
 		if err != nil {
 			log.ErrorLog(ctx, err.Error())
@@ -604,9 +595,9 @@ func checkRemoteSiteStatus(ctx context.Context, mirrorStatus []types.SiteStatus)
 func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
 	req *replication.ResyncVolumeRequest,
 ) (*replication.ResyncVolumeResponse, error) {
-	volumeID := csicommon.GetIDFromReplication(req)
-	if volumeID == "" {
-		return nil, status.Error(codes.InvalidArgument, "empty volume ID in request")
+	reqID := csicommon.GetIDFromReplication(req)
+	if reqID == "" {
+		return nil, status.Error(codes.InvalidArgument, "empty ID in request")
 	}
 	cr, err := util.NewUserCredentials(req.GetSecrets())
 	if err != nil {
@@ -614,23 +605,20 @@ func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
 	}
 	defer cr.DeleteCredentials()
 
-	if acquired := rs.VolumeLocks.TryAcquire(volumeID); !acquired {
-		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volumeID)
+	if acquired := rs.VolumeLocks.TryAcquire(reqID); !acquired {
+		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, reqID)
 
-		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volumeID)
+		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, reqID)
 	}
-	defer rs.VolumeLocks.Release(volumeID)
+	defer rs.VolumeLocks.Release(reqID)
 	mgr := rbd.NewManager(rs.csiID, req.GetParameters(), req.GetSecrets())
 	defer mgr.Destroy(ctx)
 
-	rbdVol, err := mgr.GetVolumeByID(ctx, volumeID)
+	volumes, mirror, err := mgr.GetMirrorSource(ctx, reqID, req.GetReplicationSource())
 	if err != nil {
 		return nil, getGRPCError(err)
 	}
-	mirror, err := rbdVol.ToMirror()
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
-	}
+	defer destoryVolumes(ctx, volumes)
 
 	info, err := mirror.GetMirroringInfo(ctx)
 	if err != nil {
@@ -695,35 +683,40 @@ func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
 		ready = checkRemoteSiteStatus(ctx, sts.GetAllSitesStatus())
 	}
 
-	creationTime, err := rbdVol.GetCreationTime(ctx)
-	if err != nil {
-		return nil, status.Errorf(codes.Internal, "failed to get image info for %s: %s", rbdVol, err.Error())
-	}
-
-	// image creation time is stored in the image metadata. it looks like
-	// `"seconds:1692879841 nanos:631526669"`
-	// If the image gets resynced the local image creation time will be
-	// lost, if the keys is not present in the image metadata then we can
-	// assume that the image is already resynced.
-	savedImageTime, err := rbdVol.GetMetadata(imageCreationTimeKey)
-	if err != nil && !errors.Is(err, librbd.ErrNotFound) {
-		return nil, status.Errorf(codes.Internal,
-			"failed to get %s key from image metadata for %s: %s",
-			imageCreationTimeKey,
-			rbdVol,
-			err.Error())
-	}
-
-	if savedImageTime != "" {
-		st, sErr := timestampFromString(savedImageTime)
-		if sErr != nil {
-			return nil, status.Errorf(codes.Internal, "failed to parse image creation time: %s", sErr.Error())
+	for _, vol := range volumes {
+		creationTime, tErr := vol.GetCreationTime(ctx)
+		if tErr != nil {
+			return nil, status.Errorf(codes.Internal, "failed to get image info for %s: %s", vol, tErr.Error())
 		}
-		log.DebugLog(ctx, "image %s, savedImageTime=%v, currentImageTime=%v", rbdVol, st, creationTime)
-		if req.GetForce() && st.Equal(*creationTime) {
-			err = mirror.Resync(ctx)
-			if err != nil {
-				return nil, getGRPCError(err)
+
+		// image creation time is stored in the image metadata. it looks like
+		// `"seconds:1692879841 nanos:631526669"`
+		// If the image gets resynced the local image creation time will be
+		// lost, if the keys is not present in the image metadata then we can
+		// assume that the image is already resynced.
+		var savedImageTime string
+		savedImageTime, err = vol.GetMetadata(imageCreationTimeKey)
+		if err != nil && !errors.Is(err, librbd.ErrNotFound) {
+			return nil, status.Errorf(codes.Internal,
+				"failed to get %s key from image metadata for %s: %s",
+				imageCreationTimeKey,
+				vol,
+				err.Error())
+		}
+
+		if savedImageTime != "" {
+			st, sErr := timestampFromString(savedImageTime)
+			if sErr != nil {
+				return nil, status.Errorf(codes.Internal, "failed to parse image creation time: %s", sErr.Error())
+			}
+			log.DebugLog(ctx, "image %s, savedImageTime=%v, currentImageTime=%v", vol, st, creationTime)
+			if req.GetForce() && st.Equal(*creationTime) {
+				err = mirror.Resync(ctx)
+				if err != nil {
+					return nil, getGRPCError(err)
+				}
+				// Break the loop as we need to issue resync only once for the image or for the group.
+				break
 			}
 		}
 	}
@@ -735,9 +728,12 @@ func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
 		}
 	}
 
-	err = rbdVol.RepairResyncedImageID(ctx, ready)
-	if err != nil {
-		return nil, status.Errorf(codes.Internal, "failed to resync Image ID: %s", err.Error())
+	// update imageID for all the volumes
+	for _, vol := range volumes {
+		err = vol.RepairResyncedImageID(ctx, ready)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "failed to resync Image ID: %s", err.Error())
+		}
 	}
 
 	resp := &replication.ResyncVolumeResponse{
@@ -812,9 +808,9 @@ func getGRPCError(err error) error {
 func (rs *ReplicationServer) GetVolumeReplicationInfo(ctx context.Context,
 	req *replication.GetVolumeReplicationInfoRequest,
 ) (*replication.GetVolumeReplicationInfoResponse, error) {
-	volumeID := csicommon.GetIDFromReplication(req)
-	if volumeID == "" {
-		return nil, status.Error(codes.InvalidArgument, "empty volume ID in request")
+	reqID := csicommon.GetIDFromReplication(req)
+	if reqID == "" {
+		return nil, status.Error(codes.InvalidArgument, "empty ID in request")
 	}
 	cr, err := util.NewUserCredentials(req.GetSecrets())
 	if err != nil {
@@ -822,32 +818,20 @@ func (rs *ReplicationServer) GetVolumeReplicationInfo(ctx context.Context,
 	}
 	defer cr.DeleteCredentials()
 
-	if acquired := rs.VolumeLocks.TryAcquire(volumeID); !acquired {
-		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volumeID)
+	if acquired := rs.VolumeLocks.TryAcquire(reqID); !acquired {
+		log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, reqID)
 
-		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volumeID)
+		return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, reqID)
 	}
-	defer rs.VolumeLocks.Release(volumeID)
+	defer rs.VolumeLocks.Release(reqID)
 	mgr := rbd.NewManager(rs.csiID, nil, req.GetSecrets())
 	defer mgr.Destroy(ctx)
 
-	rbdVol, err := mgr.GetVolumeByID(ctx, volumeID)
+	volumes, mirror, err := mgr.GetMirrorSource(ctx, reqID, req.GetReplicationSource())
 	if err != nil {
-		switch {
-		case errors.Is(err, corerbd.ErrImageNotFound):
-			err = status.Errorf(codes.NotFound, err.Error())
-		case errors.Is(err, util.ErrPoolNotFound):
-			err = status.Errorf(codes.NotFound, err.Error())
-		default:
-			err = status.Errorf(codes.Internal, err.Error())
-		}
-
-		return nil, err
-	}
-	mirror, err := rbdVol.ToMirror()
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
+		return nil, getGRPCError(err)
 	}
+	defer destoryVolumes(ctx, volumes)
 
 	info, err := mirror.GetMirroringInfo(ctx)
 	if err != nil {
@@ -978,3 +962,10 @@ func checkVolumeResyncStatus(ctx context.Context, localStatus types.SiteStatus)
 
 	return nil
 }
+
+// destoryVolumes destroys the volume connections.
+func destoryVolumes(ctx context.Context, volumes []types.Volume) {
+	for _, vol := range volumes {
+		vol.Destroy(ctx)
+	}
+}

internal/csi-addons/rbd/volumegroup.go

@@ -88,11 +88,7 @@ func (vs *VolumeGroupServer) CreateVolumeGroup(
 
 	// resolve all volumes
 	volumes := make([]types.Volume, len(req.GetVolumeIds()))
-	defer func() {
-		for _, vol := range volumes {
-			vol.Destroy(ctx)
-		}
-	}()
+	defer destoryVolumes(ctx, volumes)
 	for i, id := range req.GetVolumeIds() {
 		vol, err := mgr.GetVolumeByID(ctx, id)
 		if err != nil {
@@ -348,11 +344,7 @@ func (vs *VolumeGroupServer) ModifyVolumeGroupMembership(
 
 	// resolve all volumes
 	volumes := make([]types.Volume, len(toAdd))
-	defer func() {
-		for _, vol := range volumes {
-			vol.Destroy(ctx)
-		}
-	}()
+	defer destoryVolumes(ctx, volumes)
 	for i, id := range toAdd {
 		var vol types.Volume
 		vol, err = mgr.GetVolumeByID(ctx, id)

internal/rbd/group/volume_group.go

@@ -411,3 +411,7 @@ func (vg *volumeGroup) CreateSnapshots(
 
 	return snapshots, nil
 }
+
+func (vg *volumeGroup) ToMirror() (types.Mirror, error) {
+	return volumeGroupMirror{vg}, nil
+}

internal/rbd/manager.go

@@ -21,6 +21,8 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/csi-addons/spec/lib/go/replication"
+
 	"github.com/ceph/ceph-csi/internal/journal"
 	rbd_group "github.com/ceph/ceph-csi/internal/rbd/group"
 	"github.com/ceph/ceph-csi/internal/rbd/types"
@@ -503,3 +505,78 @@ func (mgr *rbdManager) CreateVolumeGroupSnapshot(
 
 	return vgs, nil
 }
+
+func (mgr *rbdManager) GetMirrorSource(ctx context.Context, reqID string,
+	rep *replication.ReplicationSource,
+) ([]types.Volume, types.Mirror, error) {
+	switch {
+	// Backward compatibility: if rep is nil, we assume that the sidecar is still old and
+	// setting only volumeId not the replication source.
+	case rep == nil || rep.GetVolume() != nil:
+		rbdVol, err := mgr.GetVolumeByID(ctx, reqID)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to get volume by id %q: %w", reqID, err)
+		}
+		defer func() {
+			if err != nil {
+				rbdVol.Destroy(ctx)
+			}
+		}()
+		var mir types.Mirror
+		mir, err = rbdVol.ToMirror()
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to convert volume %s to mirror: %w", rbdVol, err)
+		}
+
+		return []types.Volume{rbdVol}, mir, nil
+	case rep.GetVolumegroup() != nil:
+		rbdGroup, err := mgr.GetVolumeGroupByID(ctx, reqID)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to get volume group by id %q: %w", reqID, err)
+		}
+		defer func() {
+			if err != nil {
+				rbdGroup.Destroy(ctx)
+			}
+		}()
+		var mir types.Mirror
+		mir, err = rbdGroup.ToMirror()
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to convert volume group %s to mirror: %w", rbdGroup, err)
+		}
+		var vols []types.Volume
+		vols, err = rbdGroup.ListVolumes(ctx)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to list volumes in volume group %q: %w", rbdGroup, err)
+		}
+		// Get all the volume with connection and return it
+		volumes := make([]types.Volume, len(vols))
+		// Destroy connections if there is any error
+		defer func() {
+			if err != nil {
+				for _, vol := range vols {
+					vol.Destroy(ctx)
+				}
+			}
+		}()
+
+		for i, vol := range vols {
+			var id string
+			id, err = vol.GetID(ctx)
+			if err != nil {
+				return nil, nil, fmt.Errorf("failed to get id for volume %q in group %q: %w", vol, rbdGroup, err)
+			}
+			var v types.Volume
+			v, err = mgr.GetVolumeByID(ctx, id)
+			if err != nil {
+				return nil, nil, fmt.Errorf("failed to get volume by id %q in group %q: %w", id, rbdGroup, err)
+			}
+			volumes[i] = v
+		}
+
+		return volumes, mir, nil
+
+	default:
+		return nil, nil, errors.New("replication source is not set")
+	}
+}

internal/rbd/types/group.go

@@ -73,4 +73,7 @@ type VolumeGroup interface {
 	// The Snapshots are crash consistent, and created as a consistency
 	// group.
 	CreateSnapshots(ctx context.Context, cr *util.Credentials, name string) ([]Snapshot, error)
+
+	// ToMirror converts the VolumeGroup to a Mirror.
+	ToMirror() (Mirror, error)
 }

internal/rbd/types/manager.go

@@ -18,6 +18,8 @@ package types
 
 import (
 	"context"
+
+	"github.com/csi-addons/spec/lib/go/replication"
 )
 
 // VolumeResolver can be used to construct a Volume from a CSI VolumeId.
@@ -67,4 +69,8 @@ type Manager interface {
 	// VolumeGroup was paused, the snapshots in the group are crash
 	// consistent.
 	CreateVolumeGroupSnapshot(ctx context.Context, vg VolumeGroup, name string) (VolumeGroupSnapshot, error)
+
+	// GetMirrorSource returns the source of the mirror for the given volume or group.
+	GetMirrorSource(ctx context.Context, volumeID string,
+		rep *replication.ReplicationSource) ([]Volume, Mirror, error)
 }