nfit, libnvdimm, region: export 'position' in mapping info
It is useful to be able to know the position of a DIMM in an
interleave-set. Consider the case where the order of the DIMMs changes
causing a namespace to be invalidated because the interleave-set cookie no
longer matches. If the before and after state of each DIMM position is
known this state debugged by the system owner.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 5954cfb..829d760 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -723,8 +723,9 @@ static ssize_t mappingN(struct device *dev, char *buf, int n)
nd_mapping = &nd_region->mapping[n];
nvdimm = nd_mapping->nvdimm;
- return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
- nd_mapping->start, nd_mapping->size);
+ return sprintf(buf, "%s,%llu,%llu,%d\n", dev_name(&nvdimm->dev),
+ nd_mapping->start, nd_mapping->size,
+ nd_mapping->position);
}
#define REGION_MAPPING(idx) \
@@ -965,6 +966,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
nd_region->mapping[i].nvdimm = nvdimm;
nd_region->mapping[i].start = mapping->start;
nd_region->mapping[i].size = mapping->size;
+ nd_region->mapping[i].position = mapping->position;
INIT_LIST_HEAD(&nd_region->mapping[i].labels);
mutex_init(&nd_region->mapping[i].lock);