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I think snapshot[volume_name] is what you are looking for, pls see below
link for ref.

https://github.com/openstack/cinder/blob/stable/grizzly/cinder/volume/drivers/lvm.py#L233

Best Regards,
Swapnil

On Wed, Oct 16, 2013 at 10:57 AM, Dinakar Gorti Maruti <
dinakar.gm at cloudbyte.co> wrote:

> display_name parameter  of volume
>
>
> On Wed, Oct 16, 2013 at 10:55 AM, Swapnil Kulkarni <
> swapnilkulkarni2608 at gmail.com> wrote:
>
>> What exact parameters are you looking for?
>>
>>
>>
>> On Wed, Oct 16, 2013 at 10:48 AM, Dinakar Gorti Maruti <
>> dinakar.gm at cloudbyte.co> wrote:
>>
>>> Hi Swapnil,
>>>
>>>                 I had tried it before , it is returning a string
>>> "volume" followed by volume id
>>>
>>> Thanks
>>> Dinakar
>>>
>>>
>>> On Wed, Oct 16, 2013 at 10:31 AM, Swapnil Kulkarni <
>>> swapnilkulkarni2608 at gmail.com> wrote:
>>>
>>>> Hi DInakar,
>>>>
>>>> Please use volume_name, volume_size,etc. These are volume related
>>>> parameters frequently used in snapshots. You can always do *dir* to
>>>> get any specific values you need.
>>>>
>>>> Best Regards,
>>>> Swapnil
>>>>
>>>>
>>>> On Wed, Oct 16, 2013 at 10:11 AM, Dinakar Gorti Maruti <
>>>> dinakar.gm at cloudbyte.co> wrote:
>>>>
>>>>> hi,
>>>>>    I am implementing a driver for cinder services and I am stuck with
>>>>> a problem in creation of snapshot , I have a need to fetch the volume
>>>>> details in snapshot creation.
>>>>> I am using Openstack-Grizzly
>>>>>
>>>>> I am trying to use this line of code
>>>>>
>>>>> def create_snapshot(self, snapshot_ref):
>>>>>       ..........
>>>>>
>>>>>       volume = snapshot_ref['volume']
>>>>>
>>>>>       ...........
>>>>>
>>>>>
>>>>> Error :
>>>>>
>>>>> Traceback (most recent call last):
>>>>>   File
>>>>> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/amqp.py",
>>>>> line 430, in _process_data
>>>>>     rval = self.proxy.dispatch(ctxt, version, method, **args)
>>>>>   File
>>>>> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/dispatcher.py",
>>>>> line 133, in dispatch
>>>>>     return getattr(proxyobj, method)(ctxt, **kwargs)
>>>>>   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py",
>>>>> line 564, in create_snapshot
>>>>>     {'status': 'error'})
>>>>>   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
>>>>>     self.gen.next()
>>>>>   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py",
>>>>> line 554, in create_snapshot
>>>>>     model_update =
>>>>> self.driver.create_snapshot(snapshot_ref,volume_name)
>>>>>   File
>>>>> "/usr/lib/python2.6/site-packages/cinder/volume/drivers/cloudbyte.py", line
>>>>> 195, in create_snapshot
>>>>>     LOG.debug(_("phani volume object in snapshot :
>>>>> %s"),snapshot_ref['volume'])
>>>>>   File
>>>>> "/usr/lib/python2.6/site-packages/cinder/db/sqlalchemy/models.py", line 74,
>>>>> in __getitem__
>>>>>     return getattr(self, key)
>>>>>   File
>>>>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py",
>>>>> line 168, in __get__
>>>>>     return self.impl.get(instance_state(instance),dict_)
>>>>>   File
>>>>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py",
>>>>> line 453, in get
>>>>>     value = self.callable_(state, passive)
>>>>>   File
>>>>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/strategies.py",
>>>>> line 481, in _load_for_state
>>>>>     (mapperutil.state_str(state), self.key)
>>>>>
>>>>>
>>>>>  DetachedInstanceError: Parent instance <Snapshot at 0x30a0cd0> is not
>>>>> bound to a Session; lazy load operation of attribute 'volume' cannot proceed
>>>>>
>>>>> hoping for a solution
>>>>>
>>>>> Thanks
>>>>> Dinakar
>>>>>
>>>>> _______________________________________________
>>>>> Mailing list:
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>>> Post to     : openstack at lists.openstack.org
>>>>> Unsubscribe :
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>>>
>>>>>
>>>>
>>>
>>
>
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