Re: [PATCH v2] libnvdimm, btt: BTT updates for UEFI 2.7 format

[Dan Williams <dan.j.williams@intel.com>]

On Mon, Jun 26, 2017 at 3:08 PM, Vishal Verma <vishal.l.verma@intel.com> wrote:
> The UEFI 2.7 specification defines an updated BTT metadata format,
> bumping the revision to 2.0. Add support for the new format, while
> retaining compatibility for the old 1.1 format.
>
> Cc: Toshi Kani <toshi.kani@hpe.com>
> Cc: Linda Knippers <linda.knippers@hpe.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> ---
>
> v2:
>  - Don't enforce new BTTs being v2, base that decision on the holder class (Dan)
>  - Refactor nd_btt_version slightly, and get rid of the version enum.
>

Looks good one more small change:

> diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
> index 31d875a..cd0718e 100644
> --- a/drivers/nvdimm/btt_devs.c
> +++ b/drivers/nvdimm/btt_devs.c
> @@ -260,20 +260,56 @@ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
>  }
>  EXPORT_SYMBOL(nd_btt_arena_is_valid);
>
> +int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns,
> +               struct btt_sb *btt_sb)
> +{
> +       /*
> +        * At this point, the claim class can only be 'BTT' or 'NONE'. BTT
> +        * implies a BTT v2.0 and none implies v1.1
> +        */
> +       if (ndns->claim_class == NVDIMM_CCLASS_BTT) {

I think we need NVDIMM_CCLASS_BTT2 for this. I think it is valid to
enforce BTT1 vs BTT2 format even with v1.2 labels.
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