Comment 9 for bug 1870367

Relating the steps and the patches:

1) don't allow extend of an attached volume for nfs drivers => addressed by https://review.opendev.org/725805 "Disallow extension of attached volumes for NFS & Quobyte drivers"

2) figure out how to do the online extend safely, and then re-enable that functionality => addressed by https://review.opendev.org/739079 "Generic NFS: skip qemu-img resize if volume is attached"
      Depends-On: https://review.opendev.org/#/c/739049 "Enable extend attached volume tests for Cinder generic NFS driver" (this adresses comment #7)
      Depends-On: https://review.opendev.org/#/c/739077 "Implement extend_volume for libvirt NFS volume driver"

If the patch and dependencies in 2) are merged soon, we can skip step 1).