func: static int cow_probe(const uint8_t *buf, int buf_size, const char *filename)
  
  {
  
      const struct cow_header_v2 *cow_header = (const void *)buf;
  
  
  
      if (buf_size >= sizeof(struct cow_header_v2) &&
  
          be32_to_cpu(cow_header->magic) == COW_MAGIC &&
  
          be32_to_cpu(cow_header->version) == COW_VERSION)
  
          return 100;
  
      else
  
          return 0;
  
  }
  