BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, unsigned long int req, void *buf, BlockCompletionFunc *cb, void *opaque) { BlockDriver *drv = bs->drv; if (drv && drv->bdrv_aio_ioctl) return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); return NULL; }