[libvirt] [PATCH 3/5]: Set format type to LVM2 on NULL format

[Daniel P. Berrange]

On Tue, Oct 21, 2008 at 03:57:07PM +0200, Chris Lalancette wrote:
> Again because of my generic VIR_ENUM_IMPL patch last week, I unwittingly caused
> a regression in the storage_backend_logical driver.  Previously, if you
> submitted logical pool XML that had no <source><format type='lvm2'/> string, it
> would just default to VIR_STORAGE_POOL_LOGICAL_LVM2.  This would succeed just
> fine and go on with life.  This is no longer the case, and now XML without the
> format tag fails to define.  To maintain backwards compatibility with already
> existing XML that expects this, add a compatibility wrapper to return
> VIR_STORAGE_POOL_LOGICAL_LVM2 on an empty format tag.

I think I'd rather that we add a field to the .poolOptions struct
called  defaultFormat, and just do

  .defaultFormat = VIR_STORAGE_POOL_LOGICAL_LVM2

And then in the storage_conf.c method where we're parsing formats,
if we get a NULL format, explicitly set it to the default. We'd
want todo this for all drivers that support formats, not just LVM.

Then we wouldn't need to wrap the FromString methods.

> @@ -616,7 +629,7 @@ virStorageBackend virStorageBackendLogic
>      .poolOptions = {
>          .flags = (VIR_STORAGE_BACKEND_POOL_SOURCE_NAME |
>                    VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE),
> -        .formatFromString = virStorageBackendLogicalPoolTypeFromString,
> +        .formatFromString = virStorageBackendLogicalFormatFromStringWrap,
>          .formatToString = virStorageBackendLogicalPoolTypeToString,
>      },
>  

Daniel
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