diff --git a/lib/private/files/objectstore/objectstorestorage.php b/lib/private/files/objectstore/objectstorestorage.php
index b925f2e67fc..0054ee113f0 100644
--- a/lib/private/files/objectstore/objectstorestorage.php
+++ b/lib/private/files/objectstore/objectstorestorage.php
@@ -24,21 +24,19 @@ use OCP\Files\ObjectStore\IObjectStore;
 
 class ObjectStoreStorage extends \OC\Files\Storage\Common {
 
+	/**
+	 * @var array
+	 */
+	private static $tmpFiles = array();
 	/**
 	 * @var \OCP\Files\ObjectStore\IObjectStore $objectStore
 	 */
 	protected $objectStore;
-
 	/**
 	 * @var \OC\User\User $user
 	 */
 	protected $user;
 
-	/**
-	 * @var array
-	 */
-	private static $tmpFiles = array();
-
 	public function __construct($params) {
 		if (isset($params['objectstore']) && $params['objectstore'] instanceof IObjectStore) {
 			$this->objectStore = $params['objectstore'];
@@ -46,31 +44,49 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			throw new \Exception('missing IObjectStore instance');
 		}
 		if (isset($params['storageid'])) {
-			$this->id = 'object::store:'.$params['storageid'];
+			$this->id = 'object::store:' . $params['storageid'];
 		} else {
-			$this->id = 'object::store:'.$this->objectStore->getStorageId();
+			$this->id = 'object::store:' . $this->objectStore->getStorageId();
 		}
 		//initialize cache with root directory in cache
-		if ( ! $this->is_dir('/') ) {
+		if (!$this->is_dir('/')) {
 			$this->mkdir('/');
 		}
 	}
 
-	/**
-	 * Object Stores use a NoopScanner because metadata is directly stored in
-	 * the file cache and cannot really scan the filesystem. The storage passed in is not used anywhere.
-	 * @param string $path
-	 * @param \OC\Files\Storage\Storage (optional) the storage to pass to the scanner
-	 * @return \OC\Files\ObjectStore\NoopScanner
-	 */
-	public function getScanner($path = '', $storage = null) {
-		if (!$storage) {
-			$storage = $this;
+	public function mkdir($path) {
+		$path = $this->normalizePath($path);
+
+		if ($this->is_dir($path)) {
+			return false;
 		}
-		if (!isset($this->scanner)) {
-			$this->scanner = new NoopScanner($storage);
+
+		$dirName = dirname($path);
+		$parentExists = $this->is_dir($dirName);
+
+		$mTime = time();
+
+		$data = array(
+			'mimetype' => 'httpd/unix-directory',
+			'size' => 0,
+			'mtime' => $mTime,
+			'storage_mtime' => $mTime,
+			'permissions' => \OCP\PERMISSION_ALL,
+		);
+
+		if ($dirName === '.' && !$parentExists) {
+			//create root on the fly
+			$data['etag'] = $this->getETag($dirName);
+			$this->getCache()->put('', $data);
+			$parentExists = true;
 		}
-		return $this->scanner;
+
+		if ($parentExists) {
+			$data['etag'] = $this->getETag($path);
+			$this->getCache()->put($path, $data);
+			return true;
+		}
+		return false;
 	}
 
 	/**
@@ -89,61 +105,28 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 		return $path;
 	}
 
-	public function getId () {
+	/**
+	 * Object Stores use a NoopScanner because metadata is directly stored in
+	 * the file cache and cannot really scan the filesystem. The storage passed in is not used anywhere.
+	 *
+	 * @param string $path
+	 * @param \OC\Files\Storage\Storage (optional) the storage to pass to the scanner
+	 * @return \OC\Files\ObjectStore\NoopScanner
+	 */
+	public function getScanner($path = '', $storage = null) {
+		if (!$storage) {
+			$storage = $this;
+		}
+		if (!isset($this->scanner)) {
+			$this->scanner = new NoopScanner($storage);
+		}
+		return $this->scanner;
+	}
+
+	public function getId() {
 		return $this->id;
 	}
 
-	public function mkdir($path) {
-		$path = $this->normalizePath($path);
-
-		if($this->is_dir($path)) {
-			return false;
-		}
-
-		$dirName = dirname($path);
-		$parentExists = $this->is_dir($dirName);
-
-		$mTime = time();
-
-		$data = array(
-			'mimetype' => 'httpd/unix-directory',
-			'size' => 0,
-			'mtime' => $mTime,
-			'storage_mtime' => $mTime,
-			'permissions' => \OCP\PERMISSION_ALL,
-		);
-
-		if ($dirName === '.' && ! $parentExists ) {
-			//create root on the fly
-			$data['etag'] = $this->getETag($dirName);
-			$this->getCache()->put('', $data);
-			$parentExists = true;
-		}
-
-		if ($parentExists) {
-			$data['etag'] = $this->getETag($path);
-			$this->getCache()->put($path, $data);
-			return true;
-		}
-		return false;
-	}
-
-	public function file_exists($path) {
-		$path = $this->normalizePath($path);
-		return (bool)$this->stat($path);
-	}
-
-	private function rmObjects($path) {
-		$children = $this->getCache()->getFolderContents($path);
-		foreach ($children as $child) {
-			if ($child['mimetype'] === 'httpd/unix-directory') {
-				$this->rmObjects($child['path']);
-			} else {
-				$this->unlink($child['path']);
-			}
-		}
-	}
-
 	public function rmdir($path) {
 		$path = $this->normalizePath($path);
 
@@ -158,9 +141,63 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 		return true;
 	}
 
+	private function rmObjects($path) {
+		$children = $this->getCache()->getFolderContents($path);
+		foreach ($children as $child) {
+			if ($child['mimetype'] === 'httpd/unix-directory') {
+				$this->rmObjects($child['path']);
+			} else {
+				$this->unlink($child['path']);
+			}
+		}
+	}
+
+	public function unlink($path) {
+		$path = $this->normalizePath($path);
+		$stat = $this->stat($path);
+
+		if ($stat && isset($stat['fileid'])) {
+			if ($stat['mimetype'] === 'httpd/unix-directory') {
+				return $this->rmdir($path);
+			}
+			try {
+				$this->objectStore->deleteObject($this->getURN($stat['fileid']));
+			} catch (\Exception $ex) {
+				if ($ex->getCode() !== 404) {
+					\OCP\Util::writeLog('objectstore', 'Could not delete object: ' . $ex->getMessage(), \OCP\Util::ERROR);
+					return false;
+				} else {
+					//removing from cache is ok as it does not exist in the objectstore anyway
+				}
+			}
+			$this->getCache()->remove($path);
+			return true;
+		}
+		return false;
+	}
+
+	public function stat($path) {
+		return $this->getCache()->get($path);
+	}
+
+	/**
+	 * Override this method if you need a different unique resource identifier for your object storage implementation.
+	 * The default implementations just appends the fileId to 'urn:oid:'. Make sure the URN is unique over all users.
+	 * You may need a mapping table to store your URN if it cannot be generated from the fileid.
+	 *
+	 * @param int $fileId the fileid
+	 * @return null|string the unified resource name used to identify the object
+	 */
+	protected function getURN($fileId) {
+		if (is_numeric($fileId)) {
+			return 'urn:oid:' . $fileId;
+		}
+		return null;
+	}
+
 	public function opendir($path) {
 		$path = $this->normalizePath($path);
-		
+
 		if ($path === '.') {
 			$path = '';
 		} else if ($path) {
@@ -173,7 +210,7 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			foreach ($folderContents as $file) {
 				$files[] = $file['name'];
 			}
-			
+
 			\OC\Files\Stream\Dir::register('objstore' . $path, $files);
 
 			return opendir('fakedir://objstore' . $path);
@@ -183,10 +220,6 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 		}
 	}
 
-	public function stat($path) {
-		return $this->getCache()->get($path);
-	}
-
 	public function filetype($path) {
 		$path = $this->normalizePath($path);
 		$stat = $this->stat($path);
@@ -200,31 +233,6 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 		}
 	}
 
-	
-	public function unlink($path) {
-		$path = $this->normalizePath($path);
-		$stat = $this->stat($path);
-
-		if ($stat && isset($stat['fileid'])) {
-			if ($stat['mimetype'] === 'httpd/unix-directory') {
-				return $this->rmdir($path);
-			}
-			try {
-				$this->objectStore->deleteObject($this->getURN($stat['fileid']));
-			} catch (\Exception $ex) {
-				if ($ex->getCode() !== 404) {
-					\OCP\Util::writeLog('objectstore', 'Could not delete object: '.$ex->getMessage(), \OCP\Util::ERROR);
-					return false;
-				} else {
-					//removing from cache is ok as it does not exist in the objectstore anyway
-				}
-			}
-			$this->getCache()->remove($path);
-			return true;
-		}
-		return false;
-	}
-	
 	public function fopen($path, $mode) {
 		$path = $this->normalizePath($path);
 
@@ -233,15 +241,12 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			case 'rb':
 				$stat = $this->stat($path);
 				if (is_array($stat)) {
-					$tmpFile = \OC_Helper::tmpFile();
-					self::$tmpFiles[$tmpFile] = $path;
 					try {
-						$this->objectStore->getObject($this->getURN($stat['fileid']), $tmpFile);
+						return $this->objectStore->readObject($this->getURN($stat['fileid']));
 					} catch (\Exception $ex) {
-						\OCP\Util::writeLog('objectstore', 'Could not get object: '.$ex->getMessage(), \OCP\Util::ERROR);
+						\OCP\Util::writeLog('objectstore', 'Could not get object: ' . $ex->getMessage(), \OCP\Util::ERROR);
 						return false;
 					}
-					return fopen($tmpFile, 'r');
 				} else {
 					return false;
 				}
@@ -275,6 +280,11 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 		return false;
 	}
 
+	public function file_exists($path) {
+		$path = $this->normalizePath($path);
+		return (bool)$this->stat($path);
+	}
+
 	public function rename($path1, $path2) {
 		$path1 = $this->normalizePath($path1);
 		$path2 = $this->normalizePath($path2);
@@ -297,12 +307,12 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			} else {
 				return false;
 			}
-			
+
 		} else {
 			return false;
 		}
 	}
-	
+
 	public function getMimeType($path) {
 		$path = $this->normalizePath($path);
 		$stat = $this->stat($path);
@@ -312,7 +322,7 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			return false;
 		}
 	}
-	
+
 	public function touch($path, $mtime = null) {
 		if (is_null($mtime)) {
 			$mtime = time();
@@ -343,30 +353,17 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			);
 			$fileId = $this->getCache()->put($path, $stat);
 			try {
-				$this->objectStore->writeObject($this->getURN($fileId));
+				//read an empty file from memory
+				$this->objectStore->writeObject($this->getURN($fileId), fopen('php://memory', 'r'));
 			} catch (\Exception $ex) {
 				$this->getCache()->remove($path);
-				\OCP\Util::writeLog('objectstore', 'Could not create object: '.$ex->getMessage(), \OCP\Util::ERROR);
+				\OCP\Util::writeLog('objectstore', 'Could not create object: ' . $ex->getMessage(), \OCP\Util::ERROR);
 				return false;
 			}
 		}
 		return true;
 	}
 
-	/**
-	 * Override this method if you need a different unique resource identifier for your object storage implementation.
-	 * The default implementations just appends the fileId to 'urn:oid:'. Make sure the URN is unique over all users.
-	 * You may need a mapping table to store your URN if it cannot be generated from the fileid.
-	 * @param int $fileId the fileid
-	 * @return null|string the unified resource name used to identify the object
-	 */
-	protected function getURN($fileId) {
-		if (is_numeric($fileId)) {
-			return 'urn:oid:'.$fileId;
-		}
-		return null;
-	}
-
 	public function writeBack($tmpFile) {
 		if (!isset(self::$tmpFiles[$tmpFile])) {
 			return false;
@@ -391,10 +388,10 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 		$fileId = $this->getCache()->put($path, $stat);
 		try {
 			//upload to object storage
-			$this->objectStore->writeObject($this->getURN($fileId), $tmpFile);
+			$this->objectStore->writeObject($this->getURN($fileId), fopen($tmpFile, 'r'));
 		} catch (\Exception $ex) {
 			$this->getCache()->remove($path);
-			\OCP\Util::writeLog('objectstore', 'Could not create object: '.$ex->getMessage(), \OCP\Util::ERROR);
+			\OCP\Util::writeLog('objectstore', 'Could not create object: ' . $ex->getMessage(), \OCP\Util::ERROR);
 			return false;
 		}
 		return true;
diff --git a/lib/private/files/objectstore/swift.php b/lib/private/files/objectstore/swift.php
index 14892d2855e..505b5be35f2 100644
--- a/lib/private/files/objectstore/swift.php
+++ b/lib/private/files/objectstore/swift.php
@@ -21,23 +21,24 @@
 namespace OC\Files\ObjectStore;
 
 use Guzzle\Http\Exception\ClientErrorResponseException;
+use OCP\Files\ObjectStore\IObjectStore;
 use OpenCloud\OpenStack;
 
-class Swift implements \OCP\Files\ObjectStore\IObjectStore {
+class Swift implements IObjectStore {
 
 	/**
 	 * @var \OpenCloud\ObjectStore\Service
 	 */
 	private $objectStoreService;
-	
+
 	/**
 	 * @var \OpenCloud\ObjectStore\Resource\Container
 	 */
 	private $container;
 
 	public function __construct($params) {
-		if (!isset($params['username']) || !isset($params['password']) ) {
-			throw new \Exception("Access Key and Secret have to be configured.");
+		if (!isset($params['username']) || !isset($params['password'])) {
+			throw new \Exception('Access Key and Secret have to be configured.');
 		}
 		if (!isset($params['container'])) {
 			$params['container'] = 'owncloud';
@@ -80,40 +81,42 @@ class Swift implements \OCP\Files\ObjectStore\IObjectStore {
 		}
 	}
 
+	/**
+	 * @return string the container name where objects are stored
+	 */
 	public function getStorageId() {
 		return $this->container->name;
 	}
 
 	/**
-	 * @param string $urn Unified Resource Name
-	 * @param string $tmpFile
-	 * @return void
+	 * @param string $urn the unified resource name used to identify the object
+	 * @param resource $stream stream with the data to write
 	 * @throws Exception from openstack lib when something goes wrong
 	 */
-	public function writeObject($urn, $tmpFile = null) {
-		$fileData = '';
-		if ($tmpFile) {
-			$fileData = fopen($tmpFile, 'r');
-		}
-
-		$this->container->uploadObject($urn, $fileData);
+	public function writeObject($urn, $stream) {
+		$this->container->uploadObject($urn, $stream);
 	}
 
 	/**
-	 * @param string $urn Unified Resource Name
-	 * @param string $tmpFile
-	 * @return void
+	 * @param string $urn the unified resource name used to identify the object
+	 * @return resource stream with the read data
 	 * @throws Exception from openstack lib when something goes wrong
 	 */
-	public function getObject($urn, $tmpFile) {
+	public function readObject($urn) {
 		$object = $this->container->getObject($urn);
 
-		/** @var $objectContent \Guzzle\Http\EntityBody **/
+		// we need to keep a reference to objectContent or
+		// the stream will be closed before we can do anything with it
+		/** @var $objectContent \Guzzle\Http\EntityBody * */
 		$objectContent = $object->getContent();
-
 		$objectContent->rewind();
-		$stream = $objectContent->getStream();
-		file_put_contents($tmpFile, $stream);
+
+		// directly returning the object stream does not work because the GC seems to collect it, so we need a copy
+		$tmpStream = fopen('php://temp', 'r+');
+		stream_copy_to_stream($objectContent->getStream(), $tmpStream);
+		rewind($tmpStream);
+
+		return $tmpStream;
 	}
 
 	/**
diff --git a/lib/public/files/objectstore/iobjectstore.php b/lib/public/files/objectstore/iobjectstore.php
index 3b6bd98d338..b2c5a9da134 100644
--- a/lib/public/files/objectstore/iobjectstore.php
+++ b/lib/public/files/objectstore/iobjectstore.php
@@ -11,21 +11,17 @@ interface IObjectStore {
 
 	/**
 	 * @param string $urn the unified resource name used to identify the object
-	 * @param string $tmpFile path to the local temporary file that should be
-	 *        used to store the object
-	 * @return void
+	 * @return resource stream with the read data
 	 * @throws Exception when something goes wrong, message will be logged
 	 */
-	function getObject($urn, $tmpFile);
+	function readObject($urn);
 
 	/**
 	 * @param string $urn the unified resource name used to identify the object
-	 * @param string $tmpFile path to the local temporary file that the object
-	 *        should be loaded from
-	 * @return void
+	 * @param resource $stream stream with the data to write
 	 * @throws Exception when something goes wrong, message will be logged
 	 */
-	function writeObject($urn, $tmpFile = null);
+	function writeObject($urn, $stream);
 
 	/**
 	 * @param string $urn the unified resource name used to identify the object