owncloud / core

		if (!FileUtils::isPartialFile($file) and !Filesystem::isFileBlacklisted($file)) {

			//acquire a lock

			if ($lock && $this->storage->instanceOfStorage(ILockingStorage::class)) {

				$this->storage->acquireLock($file, ILockingProvider::LOCK_SHARED, $this->lockingProvider);

			}

			try {

				$data = $this->getData($file);

				return null;

			} finally {

				//release the acquired lock

				if ($lock && $this->storage->instanceOfStorage(ILockingStorage::class)) {

					$this->storage->releaseLock($file, ILockingProvider::LOCK_SHARED, $this->lockingProvider);

				}

			}

		}