nfsd: add NFSEXP_PNFS to the exflags array

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 2911f51..900c3ae 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1158,6 +1158,7 @@
 	{ NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
 	{ NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
 	{ NFSEXP_V4ROOT, {"v4root", ""}},
+	{ NFSEXP_PNFS, {"pnfs", ""}},
 	{ 0, {"", ""}}
 };
 
diff --git a/include/uapi/linux/nfsd/export.h b/include/uapi/linux/nfsd/export.h
index d3bd6ffe..0df7bd5 100644
--- a/include/uapi/linux/nfsd/export.h
+++ b/include/uapi/linux/nfsd/export.h
@@ -21,6 +21,9 @@
 
 /*
  * Export flags.
+ *
+ * Please update the expflags[] array in fs/nfsd/export.c when adding
+ * a new flag.
  */
 #define NFSEXP_READONLY		0x0001
 #define NFSEXP_INSECURE_PORT	0x0002