libnvdimm: Introduce locked DIMM capacity support
When a DIMM is locked its namespace label area may not be. Introduce the
distinction of locked namespaces to allow namespace enumeration while
the capacity is locked.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index 2339078..6c8fb75 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -34,6 +34,9 @@ static int nvdimm_probe(struct device *dev)
return rc;
}
+ /* reset locked, to be validated below... */
+ nvdimm_clear_locked(dev);
+
ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
if (!ndd)
return -ENOMEM;
@@ -48,12 +51,30 @@ static int nvdimm_probe(struct device *dev)
get_device(dev);
kref_init(&ndd->kref);
+ /*
+ * EACCES failures reading the namespace label-area-properties
+ * are interpreted as the DIMM capacity being locked but the
+ * namespace labels themselves being accessible.
+ */
rc = nvdimm_init_nsarea(ndd);
- if (rc == -EACCES)
+ if (rc == -EACCES) {
+ /*
+ * See nvdimm_namespace_common_probe() where we fail to
+ * allow namespaces to probe while the DIMM is locked,
+ * but we do allow for namespace enumeration.
+ */
nvdimm_set_locked(dev);
+ rc = 0;
+ }
if (rc)
goto err;
+ /*
+ * EACCES failures reading the namespace label-data are
+ * interpreted as the label area being locked in addition to the
+ * DIMM capacity. We fail the dimm probe to prevent regions from
+ * attempting to parse the label area.
+ */
rc = nvdimm_init_config_data(ndd);
if (rc == -EACCES)
nvdimm_set_locked(dev);
@@ -72,7 +93,6 @@ static int nvdimm_probe(struct device *dev)
if (rc == 0)
nvdimm_set_aliasing(dev);
}
- nvdimm_clear_locked(dev);
nvdimm_bus_unlock(dev);
if (rc)
