libnvdimm, pfn: add parent uuid validation 

Track and check the uuid of the namespace hosting a pfn instance.  This
forces the pfn info block to be invalidated if the namespace is
re-configured with a different uuid.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 95ecd7b..f9b674b 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -273,10 +273,11 @@
 
 int nd_pfn_validate(struct nd_pfn *nd_pfn)
 {
-	struct nd_namespace_common *ndns = nd_pfn->ndns;
-	struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
-	struct nd_namespace_io *nsio;
 	u64 checksum, offset;
+	struct nd_namespace_io *nsio;
+	struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
+	struct nd_namespace_common *ndns = nd_pfn->ndns;
+	const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev);
 
 	if (!pfn_sb || !ndns)
 		return -ENODEV;
@@ -296,6 +297,9 @@
 		return -ENODEV;
 	pfn_sb->checksum = cpu_to_le64(checksum);
 
+	if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
+		return -ENODEV;
+
 	switch (le32_to_cpu(pfn_sb->mode)) {
 	case PFN_MODE_RAM:
 		break;