Signed-off-by: Nikolai Barybin <nikolai.barybin@virtuozzo.com>
---
 src/conf/storage_source_conf.c | 8 ++++++++
 src/conf/storage_source_conf.h | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/src/conf/storage_source_conf.c b/src/conf/storage_source_conf.c
index 908bc5fab2..d76de058b9 100644
--- a/src/conf/storage_source_conf.c
+++ b/src/conf/storage_source_conf.c
@@ -69,6 +69,7 @@ VIR_ENUM_IMPL(virStorageFileFeature,
               VIR_STORAGE_FILE_FEATURE_LAST,
               "lazy_refcounts",
               "extended_l2",
+              "data_file",
 );
 
 
@@ -826,6 +827,7 @@ virStorageSourceCopy(const virStorageSource *src,
     def->relPath = g_strdup(src->relPath);
     def->backingStoreRaw = g_strdup(src->backingStoreRaw);
     def->backingStoreRawFormat = src->backingStoreRawFormat;
+    def->dataFileRaw = g_strdup(src->dataFileRaw);
     def->snapshot = g_strdup(src->snapshot);
     def->configFile = g_strdup(src->configFile);
     def->nodenameformat = g_strdup(src->nodenameformat);
@@ -891,6 +893,12 @@ virStorageSourceCopy(const virStorageSource *src,
             return NULL;
     }
 
+    if (src->dataFileStore) {
+        if (!(def->dataFileStore = virStorageSourceCopy(src->dataFileStore,
+                                                        false)))
+            return NULL;
+    }
+
     if (src->fdtuple)
         def->fdtuple = g_object_ref(src->fdtuple);
 
diff --git a/src/conf/storage_source_conf.h b/src/conf/storage_source_conf.h
index 05b4bda16c..fa27e61204 100644
--- a/src/conf/storage_source_conf.h
+++ b/src/conf/storage_source_conf.h
@@ -88,6 +88,7 @@ VIR_ENUM_DECL(virStorageFileFormat);
 typedef enum {
     VIR_STORAGE_FILE_FEATURE_LAZY_REFCOUNTS = 0,
     VIR_STORAGE_FILE_FEATURE_EXTENDED_L2,
+    VIR_STORAGE_FILE_FEATURE_DATA_FILE,
 
     VIR_STORAGE_FILE_FEATURE_LAST
 } virStorageFileFeature;
@@ -359,6 +360,9 @@ struct _virStorageSource {
     /* backing chain of the storage source */
     virStorageSource *backingStore;
 
+    /* qcow2 data file source */
+    virStorageSource *dataFileStore;
+
     /* metadata for storage driver access to remote and local volumes */
     void *drv;
 
@@ -369,6 +373,7 @@ struct _virStorageSource {
     /* Name of the child backing store recorded in metadata of the
      * current file.  */
     char *backingStoreRaw;
+    char *dataFileRaw;
     virStorageFileFormat backingStoreRawFormat;
 
     /* metadata that allows identifying given storage source */
-- 
2.43.5