1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * fs/nfs_common/nfs_ssc_comm.c
4 *
5 * Helper for knfsd's SSC to access ops in NFS client modules
6 *
7 * Author: Dai Ngo <dai.ngo@oracle.com>
8 *
9 * Copyright (c) 2020, Oracle and/or its affiliates.
10 */
11
12#include <linux/module.h>
13#include <linux/fs.h>
14#include <linux/nfs_ssc.h>
15#include "../nfs/nfs4_fs.h"
16
17MODULE_LICENSE("GPL");
18
19struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
20EXPORT_SYMBOL_GPL(nfs_ssc_client_tbl);
21
22#ifdef CONFIG_NFS_V4_2
23/**
24 * nfs42_ssc_register - install the NFS_V4 client ops in the nfs_ssc_client_tbl
25 * @ops: NFS_V4 ops to be installed
26 *
27 * Return values:
28 *   None
29 */
30void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops)
31{
32	nfs_ssc_client_tbl.ssc_nfs4_ops = ops;
33}
34EXPORT_SYMBOL_GPL(nfs42_ssc_register);
35
36/**
37 * nfs42_ssc_unregister - uninstall the NFS_V4 client ops from
38 *				the nfs_ssc_client_tbl
39 * @ops: ops to be uninstalled
40 *
41 * Return values:
42 *   None
43 */
44void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops)
45{
46	if (nfs_ssc_client_tbl.ssc_nfs4_ops != ops)
47		return;
48
49	nfs_ssc_client_tbl.ssc_nfs4_ops = NULL;
50}
51EXPORT_SYMBOL_GPL(nfs42_ssc_unregister);
52#endif /* CONFIG_NFS_V4_2 */
53
54#ifdef CONFIG_NFS_V4_2
55/**
56 * nfs_ssc_register - install the NFS_FS client ops in the nfs_ssc_client_tbl
57 * @ops: NFS_FS ops to be installed
58 *
59 * Return values:
60 *   None
61 */
62void nfs_ssc_register(const struct nfs_ssc_client_ops *ops)
63{
64	nfs_ssc_client_tbl.ssc_nfs_ops = ops;
65}
66EXPORT_SYMBOL_GPL(nfs_ssc_register);
67
68/**
69 * nfs_ssc_unregister - uninstall the NFS_FS client ops from
70 *				the nfs_ssc_client_tbl
71 * @ops: ops to be uninstalled
72 *
73 * Return values:
74 *   None
75 */
76void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops)
77{
78	if (nfs_ssc_client_tbl.ssc_nfs_ops != ops)
79		return;
80	nfs_ssc_client_tbl.ssc_nfs_ops = NULL;
81}
82EXPORT_SYMBOL_GPL(nfs_ssc_unregister);
83
84#else
85void nfs_ssc_register(const struct nfs_ssc_client_ops *ops)
86{
87}
88EXPORT_SYMBOL_GPL(nfs_ssc_register);
89
90void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops)
91{
92}
93EXPORT_SYMBOL_GPL(nfs_ssc_unregister);
94#endif /* CONFIG_NFS_V4_2 */
95