linux-kernel - Re: [PATCH V3 07/20] nvdimm/region_label: Add region label delete support

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Message-ID: <1983025922.01759726381745.JavaMail.epsvc@epcpadp2new>
Date: Mon, 29 Sep 2025 18:43:31 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: Dave Jiang <dave.jiang@...el.com>
Cc: linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, gost.dev@...sung.com,
	a.manzanares@...sung.com, vishak.g@...sung.com, neeraj.kernel@...il.com,
	cpgs@...sung.com
Subject: Re: [PATCH V3 07/20] nvdimm/region_label: Add region label delete
 support

On 22/09/25 02:37PM, Dave Jiang wrote:
>
>> +int nd_pmem_region_label_delete(struct nd_region *nd_region)
>> +{
>> +	struct nd_interleave_set *nd_set = nd_region->nd_set;
>> +	struct nd_label_ent *label_ent;
>> +	int ns_region_cnt = 0;
>> +	int i, rc;
>> +
>> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
>> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
>> +		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>> +
>> +		/* Find non cxl format supported ndr_mappings */
>> +		if (!ndd->cxl) {
>> +			dev_info(&nd_region->dev, "Unsupported region label\n");
>> +			return -EINVAL;
>> +		}
>> +
>> +		/* Find if any NS label using this region */
>> +		guard(mutex)(&nd_mapping->lock);
>> +		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
>> +			if (!label_ent->label)
>> +				continue;
>> +
>> +			/*
>> +			 * Check if any available NS labels has same
>> +			 * region_uuid in LSA
>> +			 */
>> +			if (nsl_region_uuid_equal(label_ent->label,
>> +						  &nd_set->uuid))
>> +				ns_region_cnt++;
>
>Why not just return -EBUSY here immediately? It seems the code returns -EBUSY as long as there's 1 or more below.
>
>> +		}
>> +	}
>> +
>> +	if (ns_region_cnt) {
>> +		dev_dbg(&nd_region->dev, "Region/Namespace label in use\n");
>> +		return -EBUSY;
>> +	}
>> +
>> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
>> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
>> +
>> +		rc = del_labels(nd_mapping, &nd_set->uuid, RG_LABEL_TYPE);
>> +		if (rc)
>> +			return rc;
>> +	}
>
>Can this be folded into the for loop above or does it a full pass to check before starting the label deletion process?
>
>DJ

Yes, if we use "return -EBUSY" in first loop itself then we can call del_labels()
I will fix this in next patch-set

Regards,
Neeraj