libnvdimm/labels: Introduce getters for namespace label fields

In preparation for LIBNVDIMM to manage labels on CXL devices deploy
helpers that abstract the label type from the implementation. The CXL
label format is mostly similar to the EFI label format with concepts /
fields added, like dynamic region creation and label type guids, and
other concepts removed like BLK-mode and interleave-set-cookie ids.

In addition to nsl_get_* helpers there is the nsl_ref_name() helper that
returns a pointer to a label field rather than copying the data.

Where changes touch the old whitespace style, update to clang-format
expectations.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/162982113002.1124374.15922077050771304490.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 696b55556d4d..61f43f0edabf 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -35,6 +35,72 @@ struct nvdimm_drvdata {
 	struct kref kref;
 };
 
+static inline const u8 *nsl_ref_name(struct nvdimm_drvdata *ndd,
+				     struct nd_namespace_label *nd_label)
+{
+	return nd_label->name;
+}
+
+static inline u8 *nsl_get_name(struct nvdimm_drvdata *ndd,
+			       struct nd_namespace_label *nd_label, u8 *name)
+{
+	return memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
+}
+
+static inline u32 nsl_get_slot(struct nvdimm_drvdata *ndd,
+			       struct nd_namespace_label *nd_label)
+{
+	return __le32_to_cpu(nd_label->slot);
+}
+
+static inline u64 nsl_get_checksum(struct nvdimm_drvdata *ndd,
+				   struct nd_namespace_label *nd_label)
+{
+	return __le64_to_cpu(nd_label->checksum);
+}
+
+static inline u32 nsl_get_flags(struct nvdimm_drvdata *ndd,
+				struct nd_namespace_label *nd_label)
+{
+	return __le32_to_cpu(nd_label->flags);
+}
+
+static inline u64 nsl_get_dpa(struct nvdimm_drvdata *ndd,
+			      struct nd_namespace_label *nd_label)
+{
+	return __le64_to_cpu(nd_label->dpa);
+}
+
+static inline u64 nsl_get_rawsize(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label)
+{
+	return __le64_to_cpu(nd_label->rawsize);
+}
+
+static inline u64 nsl_get_isetcookie(struct nvdimm_drvdata *ndd,
+				     struct nd_namespace_label *nd_label)
+{
+	return __le64_to_cpu(nd_label->isetcookie);
+}
+
+static inline u16 nsl_get_position(struct nvdimm_drvdata *ndd,
+				   struct nd_namespace_label *nd_label)
+{
+	return __le16_to_cpu(nd_label->position);
+}
+
+static inline u16 nsl_get_nlabel(struct nvdimm_drvdata *ndd,
+				 struct nd_namespace_label *nd_label)
+{
+	return __le16_to_cpu(nd_label->nlabel);
+}
+
+static inline u64 nsl_get_lbasize(struct nvdimm_drvdata *ndd,
+				  struct nd_namespace_label *nd_label)
+{
+	return __le64_to_cpu(nd_label->lbasize);
+}
+
 struct nd_region_data {
 	int ns_count;
 	int ns_active;