volume stuck in deleting when "host" has been changed

The volume info before I change the "host" in /etc/cinder/cinder.conf.

[root@localhost ~]# cinder show vol1
+--------------------------------+---------------------------------------------------------------------+
| Property | Value |
+--------------------------------+---------------------------------------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| consistencygroup_id | None |
| created_at | 2016-06-02T11:25:13.000000 |
| description | None |
| encrypted | False |
| id | e831ff01-f334-4eb7-8497-0fbed8667087 |
| metadata | {'volname': 'OpenCos_6354186906535030841', 'poolname': 'ipPOOL_02'} |
| migration_status | None |
| multiattach | False |
| name | vol1 |
| os-vol-host-attr:host | localhost.localdomain@KS3200ISCSIDriver#ipPOOL_02 |
| os-vol-mig-status-attr:migstat | None |
| os-vol-mig-status-attr:name_id | None |
| os-vol-tenant-attr:tenant_id | 97330b92c2144c0ea9b8826038d3abe3 |
| replication_status | disabled |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | available |
| updated_at | 2016-06-02T11:25:15.000000 |
| user_id | 346ce385360c43588f48349ed8f4159e |
| volume_type | ks3200 |
+--------------------------------+---------------------------------------------------------------------+

Then I changed the "host" to "cinder", and the vol1 cound not delete, it will be stuck in deleting.

I have the following ideas:
* if we can change the "host", it's better to provide a API to handle this, and "host" change will not make influence on volume usages.
* if we don't want anybody to change the "host", then don't make it apper in conf, generate it automaticlly.