btrfs: stash ordered extent in dio_data during iomap dio

While it is not feasible for an ordered extent to survive across the
calls btrfs_direct_write makes into __iomap_dio_rw, it is still helpful
to stash it on the dio_data in between creating it in iomap_begin and
finishing it in either end_io or iomap_end.

The specific use I have in mind is that we can check if a particular bio
is partial in submit_io without unconditionally looking up the ordered
extent. This is a preparatory patch for a later patch which does just
that.

Reviewed-by: Naohiro Aota <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Tested-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Boris Burkov <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David Sterba <[email protected]>

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