include/linux/nfs_ssc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/linux/nfs_ssc.h
   4  *
   5  * Author: Dai Ngo <dai.ngo@oracle.com>
   6  *
   7  * Copyright (c) 2020, Oracle and/or its affiliates.
   8  */
   9
  10 #include <linux/nfs_fs.h>
  11
  12 extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
  13
  14 /*
  15  * NFS_V4
  16  */
  17 struct nfs4_ssc_client_ops {
  18         struct file *(*sco_open)(struct vfsmount *ss_mnt,
  19                 struct nfs_fh *src_fh, nfs4_stateid *stateid);
  20         void (*sco_close)(struct file *filep);
  21 };
  22
  23 /*
  24  * NFS_FS
  25  */
  26 struct nfs_ssc_client_ops {
  27         void (*sco_sb_deactive)(struct super_block *sb);
  28 };
  29
  30 struct nfs_ssc_client_ops_tbl {
  31         const struct nfs4_ssc_client_ops *ssc_nfs4_ops;
  32         const struct nfs_ssc_client_ops *ssc_nfs_ops;
  33 };
  34
  35 extern void nfs42_ssc_register_ops(void);
  36 extern void nfs42_ssc_unregister_ops(void);
  37
  38 extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
  39 extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
  40
  41 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
  42 static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
  43                 struct nfs_fh *src_fh, nfs4_stateid *stateid)
  44 {
  45         if (nfs_ssc_client_tbl.ssc_nfs4_ops)
  46                 return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid);
  47         return ERR_PTR(-EIO);
  48 }
  49
  50 static inline void nfs42_ssc_close(struct file *filep)
  51 {
  52         if (nfs_ssc_client_tbl.ssc_nfs4_ops)
  53                 (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep);
  54 }
  55 #endif
  56
  57 /*
  58  * NFS_FS
  59  */
  60 extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
  61 extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
  62
  63 static inline void nfs_do_sb_deactive(struct super_block *sb)
  64 {
  65         if (nfs_ssc_client_tbl.ssc_nfs_ops)
  66                 (*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb);
  67 }