LXR linux/fs/nfs_common/nfs

   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
  15MODULE_LICENSE("GPL");
  16
  17struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
  18EXPORT_SYMBOL_GPL(nfs_ssc_client_tbl);
  19
  20#ifdef CONFIG_NFS_V4_2
  21/**
  22 * nfs42_ssc_register - install the NFS_V4 client ops in the nfs_ssc_client_tbl
  23 * @ops: NFS_V4 ops to be installed
  24 *
  25 * Return values:
  26 *   None
  27 */
  28void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops)
  29{
  30        nfs_ssc_client_tbl.ssc_nfs4_ops = ops;
  31}
  32EXPORT_SYMBOL_GPL(nfs42_ssc_register);
  33
  34/**
  35 * nfs42_ssc_unregister - uninstall the NFS_V4 client ops from
  36 *                              the nfs_ssc_client_tbl
  37 * @ops: ops to be uninstalled
  38 *
  39 * Return values:
  40 *   None
  41 */
  42void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops)
  43{
  44        if (nfs_ssc_client_tbl.ssc_nfs4_ops != ops)
  45                return;
  46
  47        nfs_ssc_client_tbl.ssc_nfs4_ops = NULL;
  48}
  49EXPORT_SYMBOL_GPL(nfs42_ssc_unregister);
  50#endif /* CONFIG_NFS_V4_2 */
  51
  52#ifdef CONFIG_NFS_V4_2
  53/**
  54 * nfs_ssc_register - install the NFS_FS client ops in the nfs_ssc_client_tbl
  55 * @ops: NFS_FS ops to be installed
  56 *
  57 * Return values:
  58 *   None
  59 */
  60void nfs_ssc_register(const struct nfs_ssc_client_ops *ops)
  61{
  62        nfs_ssc_client_tbl.ssc_nfs_ops = ops;
  63}
  64EXPORT_SYMBOL_GPL(nfs_ssc_register);
  65
  66/**
  67 * nfs_ssc_unregister - uninstall the NFS_FS client ops from
  68 *                              the nfs_ssc_client_tbl
  69 * @ops: ops to be uninstalled
  70 *
  71 * Return values:
  72 *   None
  73 */
  74void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops)
  75{
  76        if (nfs_ssc_client_tbl.ssc_nfs_ops != ops)
  77                return;
  78        nfs_ssc_client_tbl.ssc_nfs_ops = NULL;
  79}
  80EXPORT_SYMBOL_GPL(nfs_ssc_unregister);
  81
  82#else
  83void nfs_ssc_register(const struct nfs_ssc_client_ops *ops)
  84{
  85}
  86EXPORT_SYMBOL_GPL(nfs_ssc_register);
  87
  88void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops)
  89{
  90}
  91EXPORT_SYMBOL_GPL(nfs_ssc_unregister);
  92#endif /* CONFIG_NFS_V4_2 */
  93