stripe_array
struct stripe_array *s = alloc_stripe_array(conf, iod);
struct stripe_array *s = io->private_data;
static struct stripe_array *alloc_stripe_array(const struct stripe_conf *conf,
struct stripe_array *s;
static void free_stripe_array(struct stripe_array *s)
const struct ublksrv_io_desc *iod, struct stripe_array *s, void *base)