int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf1, int count1) { BlockDriver *drv = bs->drv; if (!drv) return -ENOMEDIUM; if (!drv->bdrv_pread) return bdrv_pread_em(bs, offset, buf1, count1); return drv->bdrv_pread(bs, offset, buf1, count1); }