func: static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num,
  
                                      int nb_sectors)
  
  {
  
      int64_t cluster_num, nb_clusters;
  
      if (iscsilun->allocationmap == NULL) {
  
          return;
  
      }
  
      cluster_num = sector_num / iscsilun->cluster_sectors;
  
      nb_clusters = DIV_ROUND_UP(sector_num + nb_sectors,
  
                                 iscsilun->cluster_sectors) - cluster_num;
  
      bitmap_set(iscsilun->allocationmap, cluster_num, nb_clusters);
  
  }
  