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c54483b6f4
This is going to be used in the subsequent commit as requests alignment (in particular, during copy-on-read). This value only makes sense for the formats which support subclusters (currently QCOW2 only). If this field isn't set by driver's own bdrv_get_info() implementation, we simply set it equal to the cluster size thus treating each cluster as having a single subcluster. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20230711172553.234055-2-andrey.drobyshev@virtuozzo.com>