diff --git a/lib/connector/sabre/directory.php b/lib/connector/sabre/directory.php
index c4062170d5..e29059d039 100644
--- a/lib/connector/sabre/directory.php
+++ b/lib/connector/sabre/directory.php
@@ -62,7 +62,36 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 			}
 		} else {
 			$newPath = $this->path . '/' . $name;
-			\OC\Files\Filesystem::file_put_contents($newPath, $data);
+			
+			// mark file as partial while uploading (ignored by the scanner)
+			$partpath = $newPath . '.part';
+		
+			\OC\Files\Filesystem::file_put_contents($partpath, $data);
+			
+			//detect aborted upload
+			if (isset ($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PUT' ) {
+				if (isset($_SERVER['CONTENT_LENGTH'])) {
+					$expected = $_SERVER['CONTENT_LENGTH'];
+					$actual = \OC\Files\Filesystem::filesize($partpath);
+					if ($actual != $expected) {
+						\OC\Files\Filesystem::unlink($partpath);
+						throw new Sabre_DAV_Exception_BadRequest(
+								'expected filesize ' . $expected . ' got ' . $actual);
+					}
+				}
+			}
+			
+			// rename to correct path
+			\OC\Files\Filesystem::rename($partpath, $newPath);
+			
+			// allow sync clients to send the mtime along in a header
+			$mtime = OC_Request::hasModificationTime();
+			if ($mtime !== false) {
+				if(\OC\Files\Filesystem::touch($newPath, $mtime)) {
+					header('X-OC-MTime: accepted');
+				}
+			}
+			
 			return OC_Connector_Sabre_Node::getETagPropertyForPath($newPath);
 		}
 
diff --git a/lib/connector/sabre/file.php b/lib/connector/sabre/file.php
index 521c5f0571..61165d9956 100644
--- a/lib/connector/sabre/file.php
+++ b/lib/connector/sabre/file.php
@@ -50,8 +50,29 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements Sabre_D
 		
 		\OC\Files\Filesystem::file_put_contents($partpath, $data);
 		
+		//detect aborted upload
+		if (isset ($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PUT' ) {
+			if (isset($_SERVER['CONTENT_LENGTH'])) {
+				$expected = $_SERVER['CONTENT_LENGTH'];
+				$actual = \OC\Files\Filesystem::filesize($partpath);
+				if ($actual != $expected) {
+					\OC\Files\Filesystem::unlink($partpath);
+					throw new Sabre_DAV_Exception_BadRequest(
+							'expected filesize ' . $expected . ' got ' . $actual);
+				}
+			}
+		}
+		
 		// rename to correct path
 		\OC\Files\Filesystem::rename($partpath, $this->path);
+		
+		//allow sync clients to send the mtime along in a header
+		$mtime = OC_Request::hasModificationTime();
+		if ($mtime !== false) {
+			if(\OC\Files\Filesystem::touch($this->path, $mtime)) {
+				header('X-OC-MTime: accepted');
+			}
+		}
 
 		return OC_Connector_Sabre_Node::getETagPropertyForPath($this->path);
 	}
diff --git a/lib/request.php b/lib/request.php
index 1661a1406c..3c668b02c5 100755
--- a/lib/request.php
+++ b/lib/request.php
@@ -149,4 +149,16 @@ class OC_Request {
 			return 'gzip';
 		return false;
 	}
+	
+	/**
+	 * @brief Check if the requester sent along an mtime
+	 * @returns false or an mtime
+	 */
+	static public function hasModificationTime () {
+		if (isset($_SERVER['HTTP_X_OC_MTIME'])) {
+			return $_SERVER['HTTP_X_OC_MTIME'];
+		} else {
+			return false;
+		}
+	}
 }