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Re: [libvirt] [PATCH]Fix minor issues in logical storage backend



On Thu, Sep 04, 2008 at 03:13:45PM +0200, Daniel Veillard wrote:
> On Thu, Aug 28, 2008 at 06:15:27PM -0600, Jim Fehlig wrote:
> > Hi All!
> > 
> > I came across some problems trying to create a new LVM-based storage
> > pool using this config
> > 
> > <pool type="logical">
> >   <name>test_vg</name>
> >   <source>
> >     <device path="/dev/sdb1"/>
> >   </source>
> >   <target>
> >     <path>/dev/test_vg</path>
> >   </target>
> > </pool>
> > 
> > Volume group did not previously exist so I did
> > virsh pool-define <above.xml>
> > virsh pool-build test_vg
> > 
> > pool-build failed since the backend logical storage driver does not have
> > VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE set in flags.  Without this flag
> > set, the device element is never parsed in virStoragePoolDefParseDoc()
> > (storage_conf.c), causing pvcreate to fail since no physical volume is
> > specified.
> 
>  Hum, looking at the current code now I see
> 
>     .poolOptions = {
>         .flags = VIR_STORAGE_BACKEND_POOL_SOURCE_NAME,
>         .formatFromString = virStorageBackendLogicalPoolFormatFromString,
> 
> So there is an initialization of the field. It's unclear to me if
> the two should be OR'ed, or should be kept as-is,  if we have the pool
> name do we need to provide the pool device then ? I get a bit confused
> now.

The .flag field is a bit-mask, so yes it should be OR'd. Basically the
flags are saying which XML elements are valid within the <source> tag,
and in LVM case we need to allow both <name> and <device> tags, so they
have to be OR'd

Regards,
Daniel
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