Comment 17 for bug 1870367

I had a look at the issues described in the etherpad, specifically the lack of feedback from Nova on the success of the resize.
This seems to be a problem not just for the NFS driver, since drivers using os-brick may fail [1], and Nova also handles extending of the LUKS structure of attached encrypted volumes, which may also fail.

So I believe it might be good idea to handle this as a separate bug.
The cleanest way to implement it would probably be to leave the volume status as "extending" for attached volumes, and use a new volume action, akin to the "os-migrate_volume_completion" action, to notify Cinder once Nova is done.

It might also be an option to just use the existing "os-reset_status" action to set the volume status to "error_extending" or back to "in-use", depending on whether something went wrong in Nova.

[1]: https://bugs.launchpad.net/cinder/+bug/1849425