Techniques involve: determining, based on sizes of a storage space used by a file system at a set of historical moments and a current moment, predicted sizes of a storage space to be used by the file system at a plurality of future moments. The techniques further involve: determining sizes of an available storage space and available durations of a set of candidate future moments in the plurality of future moments based on the predicted sizes. The techniques further involve: determining, based on the sizes of the available storage space and the available durations of the set of candidate future moments, predicted values that characterize available storage capacities of the set of candidate future moments. The techniques further involve: determining a target moment from the set of candidate future moments based on the predicted values to recycle at least part of an available storage space of the target moment.