xlog_write_space_left
ASSERT(xlog_write_space_left(data) >= len);
ASSERT(data->bytes_left <= xlog_write_space_left(data) ||
if (xlog_write_space_left(data) <=
rlen = min_t(uint32_t, reg->i_len, xlog_write_space_left(data));
if (rlen <= xlog_write_space_left(data))
xlog_write_space_left(data));
ASSERT(xlog_write_space_left(&data) > 0);
lv->lv_bytes > xlog_write_space_left(&data)) {