16.05.2019 17:27, Anton Nefedov wrote: > If COW areas of the newly allocated clusters are zeroes on the backing > image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be > used on the whole cluster instead of writing explicit zero buffers later > in perform_cow(). > > iotest 060: > write to the discarded cluster does not trigger COW anymore. > Use a backing image instead. > > Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> -- Best regards, Vladimir
