[libvirt] [PATCHv2 1/2] DUPLICATE: util: Add function to check if a virStorageSource is "empty"

[Peter Krempa]

On 09/11/14 20:06, Eric Blake wrote:
> On 09/11/2014 11:54 AM, Peter Krempa wrote:
>> To express empty drive we historically use storage source with empty
>> path. Unfortunately NBD disks may be declared without a path.
>>
>> Add a helper to wrap this logic.
>> ---
>>  src/libvirt_private.syms  |  1 +
>>  src/util/virstoragefile.c | 20 ++++++++++++++++++++
>>  src/util/virstoragefile.h |  1 +
>>  3 files changed, 22 insertions(+)
> 
> ACK.
> 
> If I remember right from my virDomainBlockCopy code (commit 37588b25),
> empty paths are allowed for device types of cdrom, floppy, and lun, but
> forbidden at parse time for type='block'<disk device='cdrom'> and <disk
> device='floppy'> but notionally forbidden for <disk device='disk'>.
> 
> 
>> + * Returns true if @src points to an empty storage source.
>> + */
>> +bool
>> +virStorageSourceIsEmpty(virStorageSourcePtr src)
> 
> Maybe the comment is better as:
> 
> Returns true if the guest disk has no associated host storage source
> (such as an empty cdrom drive).
> 

Sounds better. I've changed the comment and pushed this patch.

Peter

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