linux-kernel - [RFC PATCH 12/20] nvdimm/namespace_label: Skip region label during namespace creation

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Message-Id: <2024918163.301750165206130.JavaMail.epsvc@epcpadp1new>
Date: Tue, 17 Jun 2025 18:09:36 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: dan.j.williams@...el.com, dave@...olabs.net,
	jonathan.cameron@...wei.com, dave.jiang@...el.com,
	alison.schofield@...el.com, vishal.l.verma@...el.com, ira.weiny@...el.com
Cc: 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, s.neeraj@...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: [RFC PATCH 12/20] nvdimm/namespace_label: Skip region label during
 namespace creation

During namespace creation skip presence of region label if present.
Also preserve region label into labels list if present.

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/nvdimm/namespace_devs.c | 48 +++++++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index b081661b7aaa..ca8f8546170c 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1976,6 +1976,10 @@ static struct device **scan_labels(struct nd_region *nd_region)
 		if (!nd_label)
 			continue;
 
+		/* skip region labels if present */
+		if (is_region_label(ndd, nd_label))
+			continue;
+
 		/* skip labels that describe extents outside of the region */
 		if (nsl_get_dpa(ndd, &nd_label->ns_label) < nd_mapping->start ||
 		    nsl_get_dpa(ndd, &nd_label->ns_label) > map_end)
@@ -2014,9 +2018,29 @@ static struct device **scan_labels(struct nd_region *nd_region)
 
 	if (count == 0) {
 		struct nd_namespace_pmem *nspm;
+		for (i = 0; i < nd_region->ndr_mappings; i++) {
+			struct nd_label_ent *le, *e;
+			LIST_HEAD(list);
 
-		/* Publish a zero-sized namespace for userspace to configure. */
-		nd_mapping_free_labels(nd_mapping);
+			nd_mapping = &nd_region->mapping[i];
+			if (list_empty(&nd_mapping->labels))
+				continue;
+
+			list_for_each_entry_safe(le, e, &nd_mapping->labels,
+						 list) {
+				struct nd_lsa_label *nd_label = le->label;
+
+				/* preserve region labels if present */
+				if (is_region_label(ndd, nd_label))
+					list_move_tail(&le->list, &list);
+			}
+
+			/* Publish a zero-sized namespace for userspace
+			 * to configure.
+			 */
+			nd_mapping_free_labels(nd_mapping);
+			list_splice_init(&list, &nd_mapping->labels);
+		}
 		nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
 		if (!nspm)
 			goto err;
@@ -2028,7 +2052,7 @@ static struct device **scan_labels(struct nd_region *nd_region)
 	} else if (is_memory(&nd_region->dev)) {
 		/* clean unselected labels */
 		for (i = 0; i < nd_region->ndr_mappings; i++) {
-			struct list_head *l, *e;
+			struct nd_label_ent *le, *e;
 			LIST_HEAD(list);
 			int j;
 
@@ -2039,10 +2063,24 @@ static struct device **scan_labels(struct nd_region *nd_region)
 			}
 
 			j = count;
-			list_for_each_safe(l, e, &nd_mapping->labels) {
+			list_for_each_entry_safe(le, e, &nd_mapping->labels,
+						 list) {
+				struct nd_lsa_label *nd_label = le->label;
+
+				/* preserve region labels */
+				if (is_region_label(ndd, nd_label)) {
+					list_move_tail(&le->list, &list);
+					continue;
+				}
+
+				/* Once preserving selected ns label done
+				 * break out of loop
+				 */
 				if (!j--)
 					break;
-				list_move_tail(l, &list);
+
+				/* preserve selected ns label */
+				list_move_tail(&le->list, &list);
 			}
 			nd_mapping_free_labels(nd_mapping);
 			list_splice_init(&list, &nd_mapping->labels);
-- 
2.34.1