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