v4.19.13 snapshot.
diff --git a/include/linux/lockd/share.h b/include/linux/lockd/share.h
new file mode 100644
index 0000000..1f18a9f
--- /dev/null
+++ b/include/linux/lockd/share.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/lockd/share.h
+ *
+ * DOS share management for lockd.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef LINUX_LOCKD_SHARE_H
+#define LINUX_LOCKD_SHARE_H
+
+/*
+ * DOS share for a specific file
+ */
+struct nlm_share {
+ struct nlm_share * s_next; /* linked list */
+ struct nlm_host * s_host; /* client host */
+ struct nlm_file * s_file; /* shared file */
+ struct xdr_netobj s_owner; /* owner handle */
+ u32 s_access; /* access mode */
+ u32 s_mode; /* deny mode */
+};
+
+__be32 nlmsvc_share_file(struct nlm_host *, struct nlm_file *,
+ struct nlm_args *);
+__be32 nlmsvc_unshare_file(struct nlm_host *, struct nlm_file *,
+ struct nlm_args *);
+void nlmsvc_traverse_shares(struct nlm_host *, struct nlm_file *,
+ nlm_host_match_fn_t);
+
+#endif /* LINUX_LOCKD_SHARE_H */