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 #include <linux/sunrpc/svc.h>
  12
  13 extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
  14
  15 /*
  16  * NFS_V4
  17  */
  18 struct 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  */
  27 struct nfs_ssc_client_ops {
  28         void (*sco_sb_deactive)(struct super_block *sb);
  29 };
  30
  31 struct 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
  36 extern void nfs42_ssc_register_ops(void);
  37 extern void nfs42_ssc_unregister_ops(void);
  38
  39 extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
  40 extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
  41
  42 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
  43 static 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
  51 static 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 #endif
  57
  58 struct nfsd4_ssc_umount_item {
  59         struct list_head nsui_list;
  60         bool nsui_busy;
  61         /*
  62          * nsui_refcnt inited to 2, 1 on list and 1 for consumer. Entry
  63          * is removed when refcnt drops to 1 and nsui_expire expires.
  64          */
  65         refcount_t nsui_refcnt;
  66         unsigned long nsui_expire;
  67         struct vfsmount *nsui_vfsmount;
  68         char nsui_ipaddr[RPC_MAX_ADDRBUFLEN + 1];
  69 };
  70
  71 /*
  72  * NFS_FS
  73  */
  74 extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
  75 extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
  76
  77 static 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 }