next_pwrite (void *nxdata, const void *buf, uint32_t count, uint64_t offset,
             uint32_t flags, int *err)
{
  struct b_conn *b_conn = nxdata;
  return b_conn->b->pwrite (b_conn->b, b_conn->conn, buf, count, offset, flags,
                            err);
}
next_pwrite (void *nxdata, const void *buf, uint32_t count, uint64_t offset,
             uint32_t flags, int *err)
{
  struct b_conn *b_conn = nxdata;
  return b_conn->b->pwrite (b_conn->b, b_conn->conn, buf, count, offset, flags,
                            err);
}