IORING_OFF_SQES
ret = io_create_region(ctx, &ctx->sq_region, &rd, IORING_OFF_SQES);
case IORING_OFF_SQES:
ret = io_create_region(ctx, &n.sq_region, &rd, IORING_OFF_SQES);
MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQES);
s->ring_fd, IORING_OFF_SQES);