fs/nfs_common/nfs_ssc.c

   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 */