block: process before_write_notifiers in bdrv_co_discard
This is mandatory for correct backup creation. In the other case the content under this area would be lost. Dirty bits are set exactly like in bdrv_aligned_pwritev, i.e. they are set even if notifier has returned a error. Signed-off-by: NDenis V. Lunev <den@openvz.org> Reviewed-by: Vladimir Sementsov-Ogievskiy<vsementsov@virtuozzo.com> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Message-id: 1466093381-6120-4-git-send-email-den@openvz.org CC: Fam Zheng <famz@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Kevin Wolf <kwolf@redhat.com> CC: Max Reitz <mreitz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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