RNBD_ACCESS_RW
*opt->access_mode = RNBD_ACCESS_RW;
enum rnbd_access_mode access_mode = RNBD_ACCESS_RW;
[RNBD_ACCESS_RW] = {RNBD_ACCESS_RW, "rw"},
TRACE_DEFINE_ENUM(RNBD_ACCESS_RW);
{ RNBD_ACCESS_RW, "RW" }, \
case RNBD_ACCESS_RW: