Comment 6 for bug 1704201

At this point I would prefer we don't mess with the metadata method of setting mode any longer and instead move to using a field in the attachment-request. The mode setting described here is less than ideal for a number of reasons. Between the spec on the Nova side proposed by Matt and the WIP for the mode setting in Attach this should be resolved.

Any other fix that we could propose here wouldn't be something that you could back port or make work with an upgrade anyway.