[libvirt] [PATCH v2 1/2] Qemu/Gluster: Add Gluster protocol as supported network disk formats.

[Eric Blake]

On 10/04/2012 01:09 PM, Harsh Bora wrote:
> On 10/04/2012 09:17 PM, Deepak C Shetty wrote:
>> On 10/04/2012 07:01 PM, Harsh Prateek Bora wrote:
>>> Qemu accepts gluster protocol as supported storage backend beside
>>> others.
>>> This patch allows users to specify disks on gluster backends like this:
>>>
>>>      <disk type='network' device='disk'>
>>>        <driver name='qemu' type='raw'/>
>>>        <source protocol='gluster' name='volume/image'>
>>>          <host name='example.org' port='6000' transport='tcp'/>

>>> +                    <attribute name="transport">
>>> +                      <choice>
>>> +                        <value>tcp</value>
>>> +                        <value>unix</value>
>>> +                        <value>rdma</value>
>>> +                      </choice>
>>> +                    </attribute>
>> 'transport' attribute is optional, so it should be placed inside
>> <optional> </optional> ?
> 
> Not necessarily, <zeroOrMore> works for it. You may want to test the
> patch without specifying 'transport' attribute!

Deepak is right - the <attribute name="transport"> block must be
embedded in an <optional> block.  <zeroOrMore> only applies to elements,
but as written, your zeroOrMore says that it is okay to omit the overall
<host> element, but that if you provide a <host> element, it MUST have a
transport='...' attribute, and that is not correct.  For back-compat
reasons, ALL new attributes must be in an <optional> block since older
clients of the XML did not provide the new attributes.

> 
> I chose to check for only ':' to decide if its a IPv6 addr because it
> doesnt make sense to be partial towards '.' What if someone specifies a
> host name like 12:12;12,12 or 23:23,23,23 ? A '.' in an IPv6 addr is as
> bad as any other invalid char.

'.' is valid in IPv6 addr.  But yes, ':' is mandatory in IPv6, and
forbidden in IPv4, so it makes a good distinguishing test between the
two families.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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