On Thu 16 May 2019 04:27:49 PM CEST, 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: Alberto Garcia <be...@igalia.com> Berto
