Only prepare an SQL statement once.

lib/files/cache/legacy.php

@@ -91,11 +91,14 @@ class Legacy {
 	 * @return string
 	 */
 	function getEtag($path) {
+		static $query = null;
 		list(, $user, , $relativePath) = explode('/', $path, 4);
 		if (is_null($relativePath)) {
 			$relativePath = '';
 		}
-		$query = \OC_DB::prepare('SELECT `propertyvalue` FROM `*PREFIX*properties` WHERE `userid` = ? AND propertypath = ? AND propertyname = "{DAV:}getetag"');
+		if(is_null($query)){
+			$query = \OC_DB::prepare('SELECT `propertyvalue` FROM `*PREFIX*properties` WHERE `userid` = ? AND propertypath = ? AND propertyname = "{DAV:}getetag"');
+		}
 		$result = $query->execute(array($user, '/' . $relativePath));
 		if ($row = $result->fetchRow()) {
 			return trim($row['propertyvalue'], '"');