diff --git a/lib/private/Files/ObjectStore/ObjectStoreStorage.php b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
index ea60de137d25e..7c1e54ec45dc1 100644
--- a/lib/private/Files/ObjectStore/ObjectStoreStorage.php
+++ b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
@@ -87,17 +87,13 @@ public function __construct($params) {
 		if (isset($params['validateWrites'])) {
 			$this->validateWrites = (bool)$params['validateWrites'];
 		}
-		//initialize cache with root directory in cache
-		if (!$this->is_dir('/')) {
-			$this->mkdir('/');
-		}
 
 		$this->logger = \OC::$server->getLogger();
 	}
 
-	public function mkdir($path) {
+	public function mkdir($path, bool $force = false) {
 		$path = $this->normalizePath($path);
-		if ($this->file_exists($path)) {
+		if (!$force && $this->file_exists($path)) {
 			$this->logger->warning("Tried to create an object store folder that already exists: $path");
 			return false;
 		}
@@ -246,6 +242,13 @@ public function stat($path) {
 		if ($cacheEntry instanceof CacheEntry) {
 			return $cacheEntry->getData();
 		} else {
+			if ($path === '') {
+				$this->mkdir('', true);
+				$cacheEntry = $this->getCache()->get($path);
+				if ($cacheEntry instanceof CacheEntry) {
+					return $cacheEntry->getData();
+				}
+			}
 			return false;
 		}
 	}
@@ -357,6 +360,13 @@ public function fopen($path, $mode) {
 			case 'wb':
 			case 'w+':
 			case 'wb+':
+				$dirName = dirname($path);
+				$parentExists = $this->is_dir($dirName);
+				if (!$parentExists) {
+					throw new \Exception("parent $dirName not found in object store");
+					return false;
+				}
+
 				$tmpFile = \OC::$server->getTempManager()->getTemporaryFile($ext);
 				$handle = fopen($tmpFile, $mode);
 				return CallbackWrapper::wrap($handle, null, null, function () use ($path, $tmpFile) {
@@ -469,6 +479,9 @@ public function needsPartFile() {
 
 	public function file_put_contents($path, $data) {
 		$handle = $this->fopen($path, 'w+');
+		if (!$handle) {
+			return false;
+		}
 		$result = fwrite($handle, $data);
 		fclose($handle);
 		return $result;