use real disk size to consider whether it's a resize down

[jichenjc]

I have following flavor

jichen@controller:~$ nova flavor-list
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| 1 | m1.tiny | 512 | 1 | 0 | | 1 | 1.0 | True |
| 11 | t.test1 | 512 | 1 | 5 | | 1 | 1.0 | True |
| 12 | t.test2 | 512 | 1 | 2 | | 1 | 1.0 | True |

I use
nova boot --config-drive True --flavor 11 --key_name mykey --image 99ebce05-c5d2-4829-bc25-004a8d3f3efb --nic net-id=45f1ac55-e6bc-444e-be8b-3112c84646a8 --ephemeral size=1 t9

to boot a new instance ,so the eph disk is 1 G now

if we resize to flavor 12, it will fail now, but we can compare the real eph disk size and see whether we an resize it or not

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/98629

[OpenStack Infra (hudson-openstack)]

Change abandoned by jichenjc (<email address hidden>) on branch: master
Review: https://review.openstack.org/98629
Reason: wrong git operation :(

have to submit another patch

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/100546

[Sean Dague (sdague)]

patch still active

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/100546
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a6a542dbd48b51eb8005c0101afa2f1ae5c834d0
Submitter: Jenkins
Branch: master

commit a6a542dbd48b51eb8005c0101afa2f1ae5c834d0
Author: jichenjc <email address hidden>
Date: Tue Jun 17 05:25:25 2014 +0800

    Use real disk size to consider a resize down

    When resize an instance, we don't allow a resize down operation.
    Currently, a flavor ephemeral size will be used to do the check,
    but usually we might create ephemeral size less than flavor
    ephemeral size. This patch use the real disk size to do the resize
    instead of the flavor ephemeral size.

    Also, the test cases are updated to change from dict to objects,
    if we change the flavor from dict to objects will benefit from it.

    Change-Id: I03006a2ee8edf310a3ad374ebb7e4cd4034f8250
    Closes-Bug: #1324005