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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 */