fs/nfs_common/nfs_ssc.c

   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
  17 MODULE_LICENSE("GPL");
  18
  19 struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
  20 EXPORT_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  */
  30 void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops)
  31 {
  32         nfs_ssc_client_tbl.ssc_nfs4_ops = ops;
  33 }
  34 EXPORT_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  */
  44 void 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 }
  51 EXPORT_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  */
  62 void nfs_ssc_register(const struct nfs_ssc_client_ops *ops)
  63 {
  64         nfs_ssc_client_tbl.ssc_nfs_ops = ops;
  65 }
  66 EXPORT_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  */
  76 void 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 }
  82 EXPORT_SYMBOL_GPL(nfs_ssc_unregister);
  83
  84 #else
  85 void nfs_ssc_register(const struct nfs_ssc_client_ops *ops)
  86 {
  87 }
  88 EXPORT_SYMBOL_GPL(nfs_ssc_register);
  89
  90 void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops)
  91 {
  92 }
  93 EXPORT_SYMBOL_GPL(nfs_ssc_unregister);
  94 #endif /* CONFIG_NFS_V4_2 */