fn fallocateLinux(fd: c_int, mode: c_int, offset: off_t, len: off_t) callconv(.c) c_int
fn fallocateLinux(fd: c_int, mode: c_int, offset: off_t, len: off_t) callconv(.c) c_int { return errno(linux.fallocate(fd, @bitCast(mode), offset, len)); }