v4.19.13 snapshot.
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h
new file mode 100644
index 0000000..fc9978c
--- /dev/null
+++ b/fs/nfs/netns.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NFS-private data for each "struct net".  Accessed with net_generic().
+ */
+
+#ifndef __NFS_NETNS_H__
+#define __NFS_NETNS_H__
+
+#include <linux/nfs4.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+struct bl_dev_msg {
+	int32_t status;
+	uint32_t major, minor;
+};
+
+struct nfs_net {
+	struct cache_detail *nfs_dns_resolve;
+	struct rpc_pipe *bl_device_pipe;
+	struct bl_dev_msg bl_mount_reply;
+	wait_queue_head_t bl_wq;
+	struct mutex bl_mutex;
+	struct list_head nfs_client_list;
+	struct list_head nfs_volume_list;
+#if IS_ENABLED(CONFIG_NFS_V4)
+	struct idr cb_ident_idr; /* Protected by nfs_client_lock */
+	unsigned short nfs_callback_tcpport;
+	unsigned short nfs_callback_tcpport6;
+	int cb_users[NFS4_MAX_MINOR_VERSION + 1];
+#endif
+	spinlock_t nfs_client_lock;
+	ktime_t boot_time;
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *proc_nfsfs;
+#endif
+};
+
+extern unsigned int nfs_net_id;
+
+#endif