add missing proper error return in WalkDir() (#18884)

without this the caller might end up returning
incorrect errors and not ignoring the drive
properly.

cmd/metacache-walk.go

@@ -407,12 +407,12 @@ func (client *storageRESTClient) WalkDir(ctx context.Context, opts WalkDirOption
 	opts.DiskID = client.diskID
 	b, err := opts.MarshalMsg(grid.GetByteBuffer()[:0])
 	if err != nil {
-		return err
+		return toStorageErr(err)
 	}
 
 	st, err := client.gridConn.NewStream(ctx, grid.HandlerWalkDir, b)
 	if err != nil {
-		return err
+		return toStorageErr(err)
 	}
 	return toStorageErr(st.Results(func(in []byte) error {
 		_, err := wr.Write(in)

cmd/storage-rest-client.go

@@ -87,6 +87,8 @@ func toStorageErr(err error) error {
 	switch err.Error() {
 	case errFaultyDisk.Error():
 		return errFaultyDisk
+	case errFaultyRemoteDisk.Error():
+		return errFaultyRemoteDisk
 	case errFileCorrupt.Error():
 		return errFileCorrupt
 	case errUnexpected.Error():
@@ -135,6 +137,16 @@ func toStorageErr(err error) error {
 		return errDiskNotFound
 	case errDiskNotFound.Error():
 		return errDiskNotFound
+	case errMaxVersionsExceeded.Error():
+		return errMaxVersionsExceeded
+	case errInconsistentDisk.Error():
+		return errInconsistentDisk
+	case errDriveIsRoot.Error():
+		return errDriveIsRoot
+	case errDiskOngoingReq.Error():
+		return errDiskOngoingReq
+	case grid.ErrUnknownHandler.Error():
+		return errInconsistentDisk
 	}
 	return err
 }