nbd/server: simplify reply transmission
Send qiov via qio_channel_writev_all instead of calling nbd_write twice with a cork. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20171012095319.136610-8-vsementsov@virtuozzo.com> [eblake: rebase to tweaks earlier in series] Signed-off-by: NEric Blake <eblake@redhat.com>
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