[PATCH 2/3] Add find_vgname_from_pvname() function using lvmcache functions.

[Dave Wysochanski <dwysocha@redhat.com>]

On Wed, 2010-03-17 at 11:51 -0400, Dave Wysochanski wrote:
> +char *find_vgname_from_pvname(struct cmd_context *cmd, const char
> *pvname)
> +{
> +       char *vgname;
> +       struct lvmcache_info *info;
> +
> +       /*
> +        * Initially, all we have is a pv name - we don't know the VG
> name.
> +        * Try to look the name up in lvmcache.
> +        */
> +       lvmcache_label_scan(cmd, 0);
> +       vgname = lvmcache_vgname_from_pvname(cmd, pvname);
> +

Actually the lvmcache_label_scan() should not be necessary here.

We read the label for the device later and the expensive scans if
necessary (orphan and no mdas).