func: static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
  
          int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  
          BlockDriverCompletionFunc *cb, void *opaque)
  
  {
  
      RawAIOCB *acb;
  
  
  
      acb = raw_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque);
  
      if (!acb)
  
          return NULL;
  
      if (qemu_paio_write(&acb->aiocb) < 0) {
  
          raw_aio_remove(acb);
  
          return NULL;
  
      }
  
      return &acb->common;
  
  }
  