linux-kernel - Re: [RFC PATCH 07/20] nvdimm/namespace_label: Update namespace init_labels and its region

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Message-ID: <20250623101104.00001ca4@huawei.com>
Date: Mon, 23 Jun 2025 10:11:04 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Neeraj Kumar <s.neeraj@...sung.com>
CC: <dan.j.williams@...el.com>, <dave@...olabs.net>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<ira.weiny@...el.com>, <a.manzanares@...sung.com>, <nifan.cxl@...il.com>,
	<anisa.su@...sung.com>, <vishak.g@...sung.com>, <krish.reddy@...sung.com>,
	<arun.george@...sung.com>, <alok.rathore@...sung.com>,
	<neeraj.kernel@...il.com>, <linux-kernel@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>, <nvdimm@...ts.linux.dev>,
	<gost.dev@...sung.com>, <cpgs@...sung.com>
Subject: Re: [RFC PATCH 07/20] nvdimm/namespace_label: Update namespace
 init_labels and its region_uuid

On Tue, 17 Jun 2025 18:09:31 +0530
Neeraj Kumar <s.neeraj@...sung.com> wrote:

> nd_mapping->labels maintains the list of labels present into LSA.
> init_labels function prepares this list while adding new label

init_labels() prepares


> into LSA and updates nd_mapping->labels accordingly. During cxl
> region creation nd_mapping->labels list and LSA was updated with
> one region label. Therefore during new namespace label creation
> pre-include the previously created region label, so increase
> num_labels count by 1.
> 
> Also updated nsl_set_region_uuid with region uuid with which
> namespace is associated with.
> 
> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
> ---
>  drivers/nvdimm/label.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 9381c50086fc..108100c4bf44 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -947,7 +947,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
>  	nsl_set_slot(ndd, ns_label, slot);
>  	nsl_set_alignment(ndd, ns_label, 0);
>  	nsl_set_type_guid(ndd, ns_label, &nd_set->type_guid);
> -	nsl_set_region_uuid(ndd, ns_label, NULL);
> +	nsl_set_region_uuid(ndd, ns_label, &nd_set->uuid);
>  	nsl_set_claim_class(ndd, ns_label, ndns->claim_class);
>  	nsl_calculate_checksum(ndd, ns_label);
>  	nd_dbg_dpa(nd_region, ndd, res, "\n");
> @@ -1114,7 +1114,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
>  				count++;
>  		WARN_ON_ONCE(!count);
>  
> -		rc = init_labels(nd_mapping, count);
> +		/* Adding 1 to pre include the already added region label */
> +		rc = init_labels(nd_mapping, count + 1);
>  		if (rc < 0)
>  			return rc;
>