LXR linux/include/linux/lockd/bind.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * linux/include/linux/lockd/bind.h
   4 *
   5 * This is the part of lockd visible to nfsd and the nfs client.
   6 *
   7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
   8 */
   9
  10#ifndef LINUX_LOCKD_BIND_H
  11#define LINUX_LOCKD_BIND_H
  12
  13#include <linux/lockd/nlm.h>
  14/* need xdr-encoded error codes too, so... */
  15#include <linux/lockd/xdr.h>
  16#ifdef CONFIG_LOCKD_V4
  17#include <linux/lockd/xdr4.h>
  18#endif
  19
  20/* Dummy declarations */
  21struct svc_rqst;
  22struct rpc_task;
  23
  24/*
  25 * This is the set of functions for lockd->nfsd communication
  26 */
  27struct nlmsvc_binding {
  28        __be32                  (*fopen)(struct svc_rqst *,
  29                                                struct nfs_fh *,
  30                                                struct file **,
  31                                                int mode);
  32        void                    (*fclose)(struct file *);
  33};
  34
  35extern const struct nlmsvc_binding *nlmsvc_ops;
  36
  37/*
  38 * Similar to nfs_client_initdata, but without the NFS-specific
  39 * rpc_ops field.
  40 */
  41struct nlmclnt_initdata {
  42        const char              *hostname;
  43        const struct sockaddr   *address;
  44        size_t                  addrlen;
  45        unsigned short          protocol;
  46        u32                     nfs_version;
  47        int                     noresvport;
  48        struct net              *net;
  49        const struct nlmclnt_operations *nlmclnt_ops;
  50        const struct cred       *cred;
  51};
  52
  53/*
  54 * Functions exported by the lockd module
  55 */
  56
  57extern struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init);
  58extern void     nlmclnt_done(struct nlm_host *host);
  59
  60/*
  61 * NLM client operations provide a means to modify RPC processing of NLM
  62 * requests.  Callbacks receive a pointer to data passed into the call to
  63 * nlmclnt_proc().
  64 */
  65struct nlmclnt_operations {
  66        /* Called on successful allocation of nlm_rqst, use for allocation or
  67         * reference counting. */
  68        void (*nlmclnt_alloc_call)(void *);
  69
  70        /* Called in rpc_task_prepare for unlock.  A return value of true
  71         * indicates the callback has put the task to sleep on a waitqueue
  72         * and NLM should not call rpc_call_start(). */
  73        bool (*nlmclnt_unlock_prepare)(struct rpc_task*, void *);
  74
  75        /* Called when the nlm_rqst is freed, callbacks should clean up here */
  76        void (*nlmclnt_release_call)(void *);
  77};
  78
  79extern int      nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl, void *data);
  80extern int      lockd_up(struct net *net, const struct cred *cred);
  81extern void     lockd_down(struct net *net);
  82
  83#endif /* LINUX_LOCKD_BIND_H */
  84