static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { QCowAIOCB *acb; acb = qemu_aio_get(bs, cb, opaque); if (!acb) return NULL; acb->hd_aiocb = NULL; acb->sector_num = sector_num; acb->qiov = qiov; if (qiov->niov > 1) acb->buf = acb->orig_buf = qemu_memalign(512, qiov->size); else acb->buf = (uint8_t *)qiov->iov->iov_base; acb->nb_sectors = nb_sectors; acb->n = 0; acb->cluster_offset = 0; qcow_aio_read_cb(acb, 0); return &acb->common; }