Added DrupalConfigStorageInterface::writeToFile().

write() called into copyToFile() previously, which needlessly re-loaded the configuration data from the active storage, whereas the data is already available.

core/lib/Drupal/Core/Config/DrupalConfigVerifiedStorage.php

@@ -41,7 +41,7 @@ abstract class DrupalConfigVerifiedStorage implements DrupalConfigVerifiedStorag
    * Implements DrupalConfigVerifiedStorageInterface::copyToFile().
    */
   public function copyToFile() {
-    return $this->signedFileStorage()->write($this->read());
+    return $this->writeToFile($this->read());
   }
 
   /**
@@ -80,7 +80,14 @@ abstract class DrupalConfigVerifiedStorage implements DrupalConfigVerifiedStorag
    */
   public function write($data) {
     $this->writeToActive($data);
-    $this->copyToFile();
+    $this->writeToFile($data);
+  }
+
+  /**
+   * Implements DrupalConfigVerifiedStorageInterface::writeToFile().
+   */
+  public function writeToFile($data) {
+    return $this->signedFileStorage()->write($data);
   }
 
   /**

core/lib/Drupal/Core/Config/DrupalConfigVerifiedStorageInterface.php

@@ -47,6 +47,14 @@ interface DrupalConfigVerifiedStorageInterface {
    */
   function isOutOfSync();
 
+  /**
+   * Writes the configuration data into the active storage and the file.
+   *
+   * @param $data
+   *   The configuration data to write.
+   */
+  function write($data);
+
   /**
    * Writes the configuration data into the active storage but not the file.
    *
@@ -59,12 +67,12 @@ interface DrupalConfigVerifiedStorageInterface {
   function writeToActive($data);
 
   /**
-   * Writes the configuration data into the active storage and the file.
+   * Writes the configuration data into the file.
    *
    * @param $data
-   *   The configuration data to write.
+   *   The configuration data to write into the file.
    */
-  function write($data);
+  function writeToFile($data);
 
   /**
    * Gets names starting with this prefix.