Hello, This is just my suggestion, in ovl_statfs() isn’t it better to set below fields(indicating available free resource) to zero when overlayfs doesn’t have upper fs?Because overlayfs can not occupy resource in lower stack fs anymore, I think it can reduce the possibility of misunderstanding from caller. u64 f_bfree /* free blocks in fs */ u64 f_bavail /* free blocks available to unprivileged user */ u64 f_ffree /* free file nodes in fs */ Thanks, Chengguang. -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html