[PATCH v5 1/2] libxcmd: generalize topology functions

[Christoph Hellwig]

I still think libxfs would be the better place, but otherwise this looks
fine in general.

> +#ifdef ENABLE_BLKID
> +#  include <blkid/blkid.h>
> +#endif /* ENABLE_BLKID */
> +#include "xfs_multidisk.h"

But what tree is this against?  I can't find a xfs_multidisk.h in
the master branch, nor in this patch?