block: document semantics of bdrv_co_preadv|pwritev
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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