LXR linux/include/linux/nfs

   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#include <linux/sunrpc/svc.h>
  12
  13extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
  14
  15/*
  16 * NFS_V4
  17 */
  18struct nfs4_ssc_client_ops {
  19        struct file *(*sco_open)(struct vfsmount *ss_mnt,
  20                struct nfs_fh *src_fh, nfs4_stateid *stateid);
  21        void (*sco_close)(struct file *filep);
  22};
  23
  24/*
  25 * NFS_FS
  26 */
  27struct nfs_ssc_client_ops {
  28        void (*sco_sb_deactive)(struct super_block *sb);
  29};
  30
  31struct nfs_ssc_client_ops_tbl {
  32        const struct nfs4_ssc_client_ops *ssc_nfs4_ops;
  33        const struct nfs_ssc_client_ops *ssc_nfs_ops;
  34};
  35
  36extern void nfs42_ssc_register_ops(void);
  37extern void nfs42_ssc_unregister_ops(void);
  38
  39extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
  40extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
  41
  42#ifdef CONFIG_NFSD_V4_2_INTER_SSC
  43static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
  44                struct nfs_fh *src_fh, nfs4_stateid *stateid)
  45{
  46        if (nfs_ssc_client_tbl.ssc_nfs4_ops)
  47                return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid);
  48        return ERR_PTR(-EIO);
  49}
  50
  51static inline void nfs42_ssc_close(struct file *filep)
  52{
  53        if (nfs_ssc_client_tbl.ssc_nfs4_ops)
  54                (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep);
  55}
  56
  57struct nfsd4_ssc_umount_item {
  58        struct list_head nsui_list;
  59        bool nsui_busy;
  60        /*
  61         * nsui_refcnt inited to 2, 1 on list and 1 for consumer. Entry
  62         * is removed when refcnt drops to 1 and nsui_expire expires.
  63         */
  64        refcount_t nsui_refcnt;
  65        unsigned long nsui_expire;
  66        struct vfsmount *nsui_vfsmount;
  67        char nsui_ipaddr[RPC_MAX_ADDRBUFLEN];
  68};
  69#endif
  70
  71/*
  72 * NFS_FS
  73 */
  74extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
  75extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
  76
  77static inline void nfs_do_sb_deactive(struct super_block *sb)
  78{
  79        if (nfs_ssc_client_tbl.ssc_nfs_ops)
  80                (*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb);
  81}
  82