util: virstoragefile: Add data structure for storing storage source slices

Introduce virStorageSourceSlice which will store the 'offset' and 'size'
of a virStorageSource and declare it as 'sliceStorage' and 'sliceFormat'
attributes of a virStorageSource.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/util/virstoragefile.c

@@ -2248,6 +2248,30 @@ virStorageSourcePoolDefCopy(const virStorageSourcePoolDef *src)
 }
 
 
+static virStorageSourceSlicePtr
+virStorageSourceSliceCopy(const virStorageSourceSlice *src)
+{
+    virStorageSourceSlicePtr ret = g_new0(virStorageSourceSlice, 1);
+
+    ret->offset = src->offset;
+    ret->size = src->size;
+    ret->nodename = g_strdup(src->nodename);
+
+    return ret;
+}
+
+
+static void
+virStorageSourceSliceFree(virStorageSourceSlicePtr slice)
+{
+    if (!slice)
+        return;
+
+    g_free(slice->nodename);
+    g_free(slice);
+}
+
+
 /**
  * virStorageSourcePtr:
  *
@@ -2302,6 +2326,9 @@ virStorageSourceCopy(const virStorageSource *src,
     def->tlsAlias = g_strdup(src->tlsAlias);
     def->tlsCertdir = g_strdup(src->tlsCertdir);
 
+    if (src->sliceStorage)
+        def->sliceStorage = virStorageSourceSliceCopy(src->sliceStorage);
+
     if (src->nhosts) {
         if (!(def->hosts = virStorageNetHostDefCopy(src->nhosts, src->hosts)))
             return NULL;
@@ -2581,6 +2608,8 @@ virStorageSourceClear(virStorageSourcePtr def)
     VIR_FREE(def->timestamps);
     VIR_FREE(def->externalDataStoreRaw);
 
+    virStorageSourceSliceFree(def->sliceStorage);
+
     virObjectUnref(def->externalDataStore);
     def->externalDataStore = NULL;
 

src/util/virstoragefile.h

@@ -242,6 +242,16 @@ struct _virStorageSourceNVMeDef {
     /* Don't forget to update virStorageSourceNVMeDefCopy */
 };
 
+
+typedef struct _virStorageSourceSlice virStorageSourceSlice;
+typedef virStorageSourceSlice *virStorageSourceSlicePtr;
+struct _virStorageSourceSlice {
+    unsigned long long offset;
+    unsigned long long size;
+    char *nodename;
+};
+
+
 typedef struct _virStorageDriverData virStorageDriverData;
 typedef virStorageDriverData *virStorageDriverDataPtr;
 
@@ -286,6 +296,8 @@ struct _virStorageSource {
     bool nocow;
     bool sparse;
 
+    virStorageSourceSlicePtr sliceStorage;
+
     virStoragePermsPtr perms;
     virStorageTimestampsPtr timestamps;
     unsigned long long capacity; /* in bytes, 0 if unknown */