1 files changed, 74 insertions, 0 deletions
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
new file mode 100644
index 000000000000..b353abe00357
--- /dev/null
+++ b/include/linux/nfslocalio.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2024 Mike Snitzer <snitzer@hammerspace.com>
+ * Copyright (C) 2024 NeilBrown <neilb@suse.de>
+ */
+#ifndef __LINUX_NFSLOCALIO_H
+#define __LINUX_NFSLOCALIO_H
+
+/* nfsd_file structure is purposely kept opaque to NFS client */
+struct nfsd_file;
+
+#if IS_ENABLED(CONFIG_NFS_LOCALIO)
+
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/uuid.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/nfs.h>
+#include <net/net_namespace.h>
+
+/*
+ * Useful to allow a client to negotiate if localio
+ * possible with its server.
+ *
+ * See Documentation/filesystems/nfs/localio.rst for more detail.
+ */
+typedef struct {
+	uuid_t uuid;
+	struct list_head list;
+	struct net __rcu *net; /* nfsd's network namespace */
+	struct auth_domain *dom; /* auth_domain for localio */
+} nfs_uuid_t;
+
+void nfs_uuid_begin(nfs_uuid_t *);
+void nfs_uuid_end(nfs_uuid_t *);
+void nfs_uuid_is_local(const uuid_t *, struct list_head *,
+		       struct net *, struct auth_domain *, struct module *);
+void nfs_uuid_invalidate_clients(struct list_head *list);
+void nfs_uuid_invalidate_one_client(nfs_uuid_t *nfs_uuid);
+
+/* localio needs to map filehandle -> struct nfsd_file */
+extern struct nfsd_file *
+nfsd_open_local_fh(struct net *, struct auth_domain *, struct rpc_clnt *,
+		   const struct cred *, const struct nfs_fh *,
+		   const fmode_t) __must_hold(rcu);
+
+struct nfsd_localio_operations {
+	bool (*nfsd_serv_try_get)(struct net *);
+	void (*nfsd_serv_put)(struct net *);
+	struct nfsd_file *(*nfsd_open_local_fh)(struct net *,
+						struct auth_domain *,
+						struct rpc_clnt *,
+						const struct cred *,
+						const struct nfs_fh *,
+						const fmode_t);
+	void (*nfsd_file_put_local)(struct nfsd_file *);
+	struct file *(*nfsd_file_file)(struct nfsd_file *);
+} ____cacheline_aligned;
+
+extern void nfsd_localio_ops_init(void);
+extern const struct nfsd_localio_operations *nfs_to;
+
+struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *,
+		   struct rpc_clnt *, const struct cred *,
+		   const struct nfs_fh *, const fmode_t);
+
+#else   /* CONFIG_NFS_LOCALIO */
+static inline void nfsd_localio_ops_init(void)
+{
+}
+#endif  /* CONFIG_NFS_LOCALIO */
+
+#endif  /* __LINUX_NFSLOCALIO_H */