fb7afc797e
This is necessary for efficient block-status export, for clients which support it. (qemu is not yet such a client, but could become one.) Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20180704112302.471456-3-vsementsov@virtuozzo.com> [eblake: grammar tweaks] Signed-off-by: Eric Blake <eblake@redhat.com>