int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors) { BlockDriver *drv = bs->drv; int ret; if (!drv) { return -ENOMEDIUM; } if (!drv->bdrv_write_compressed) { return -ENOTSUP; } ret = bdrv_check_request(bs, sector_num, nb_sectors); if (ret < 0) { return ret; } assert(QLIST_EMPTY(&bs->dirty_bitmaps)); return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); }