Revert "storage: disk: Separate creating of the volume from building"

This reverts commit 67ccf91b.
We only generate the volume key after we've built it, but the storage
driver expects it to be filled after createVol finishes.
Squash the volume building back with creating to fulfill this
expectation.

src/storage/storage_backend_disk.c

@@ -617,43 +617,28 @@ virStorageBackendDiskPartBoundries(virStoragePoolObjPtr pool,
 
 static int
 virStorageBackendDiskCreateVol(virConnectPtr conn ATTRIBUTE_UNUSED,
-                               virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+                               virStoragePoolObjPtr pool,
                                virStorageVolDefPtr vol)
-{
-    if (vol->target.encryption != NULL) {
-        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                       _("storage pool does not support encrypted volumes"));
-        return -1;
-    }
-
-    vol->type = VIR_STORAGE_VOL_BLOCK;
-
-    return 0;
-}
-
-
-static int
-virStorageBackendDiskBuildVol(virConnectPtr conn ATTRIBUTE_UNUSED,
-                              virStoragePoolObjPtr pool,
-                              virStorageVolDefPtr vol,
-                              unsigned int flags)
 {
     int res = -1;
     char *partFormat = NULL;
     unsigned long long startOffset = 0, endOffset = 0;
-    virCommandPtr cmd = NULL;
-
-    virCheckFlags(0, -1);
-
-    cmd = virCommandNewArgList(PARTED,
-                               pool->def->source.devices[0].path,
-                               "mkpart",
-                               "--script",
-                               NULL);
+    virCommandPtr cmd = virCommandNewArgList(PARTED,
+                                             pool->def->source.devices[0].path,
+                                             "mkpart",
+                                             "--script",
+                                             NULL);
 
-    if (virStorageBackendDiskPartFormat(pool, vol, &partFormat) != 0)
+    if (vol->target.encryption != NULL) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       "%s", _("storage pool does not support encrypted "
+                               "volumes"));
         goto cleanup;
+    }
 
+    if (virStorageBackendDiskPartFormat(pool, vol, &partFormat) != 0) {
+        goto cleanup;
+    }
     virCommandAddArg(cmd, partFormat);
 
     if (virStorageBackendDiskPartBoundries(pool, &startOffset,
@@ -783,6 +768,5 @@ virStorageBackend virStorageBackendDisk = {
 
     .createVol = virStorageBackendDiskCreateVol,
     .deleteVol = virStorageBackendDiskDeleteVol,
-    .buildVol = virStorageBackendDiskBuildVol,
     .buildVolFrom = virStorageBackendDiskBuildVolFrom,
 };