NFS driver does not implement extend volume

[Andrew Kerr]

The generic NFS driver does not implement the volume extend feature.

2014-03-20 14:54:01.770 ERROR cinder.volume.manager [req-49a0fce4-c244-47c6-8d15-1c78b43bc4b5 394190ae53024d4db21ad36889ee49fb 8305968860c84220991ffb2926794286] volume f925db6e-2454-4d74-85fb-8986684c55ba: Error trying to extend volume
2014-03-20 14:54:01.770 TRACE cinder.volume.manager Traceback (most recent call last):
2014-03-20 14:54:01.770 TRACE cinder.volume.manager File "/opt/stack/cinder/cinder/volume/manager.py", line 1145, in extend_volume
2014-03-20 14:54:01.770 TRACE cinder.volume.manager self.driver.extend_volume(volume, new_size)
2014-03-20 14:54:01.770 TRACE cinder.volume.manager File "/opt/stack/cinder/cinder/volume/driver.py", line 530, in extend_volume
2014-03-20 14:54:01.770 TRACE cinder.volume.manager raise NotImplementedError(msg)
2014-03-20 14:54:01.770 TRACE cinder.volume.manager NotImplementedError: Extend volume not implemented
2014-03-20 14:54:01.770 TRACE cinder.volume.manager

[AllenGuo (xiaoguo)]

@John Griffith
Hi,
One simple way to implement extend_volume in NFS driver is using truncate,
but I am not sure if this a good practice.
any idea?

[Navneet (singn)]

Allen the easiest way to fix this would be by shifting the extend_volume/dependent methods in NetAppNFSDriver to NfsDriver. It uses image_utils and subsequently qemu to extend the volume. Truncate is another way to abruptly increase the size of a file but the former takes care of any block device format/file systems on it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/82100

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/82100
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=8cd4224070299cefa922ff2251fe81770494ad46
Submitter: Jenkins
Branch: master

commit 8cd4224070299cefa922ff2251fe81770494ad46
Author: Andrew Kerr <email address hidden>
Date: Fri Mar 21 10:13:58 2014 -0400

    Implement extend volume in NFS driver

    This fix implements the extend_volume functionality in the NFS
    driver.

    Change-Id: I1634fef0206b4ef12684c6c7f4851d76da579942
    Closes-Bug: #1295316