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 */ 21 struct svc_rqst; 22 struct rpc_task; 23 struct rpc_clnt; 24 25 /* 26 * This is the set of functions for lockd->nfsd communication 27 */ 28 struct nlmsvc_binding { 29 __be32 (*fopen)(struct svc_rqst *, 30 struct nfs_fh *, 31 struct file **, 32 int mode); 33 void (*fclose)(struct file *); 34 }; 35 36 extern const struct nlmsvc_binding *nlmsvc_ops; 37 38 /* 39 * Similar to nfs_client_initdata, but without the NFS-specific 40 * rpc_ops field. 41 */ 42 struct nlmclnt_initdata { 43 const char *hostname; 44 const struct sockaddr *address; 45 size_t addrlen; 46 unsigned short protocol; 47 u32 nfs_version; 48 int noresvport; 49 struct net *net; 50 const struct nlmclnt_operations *nlmclnt_ops; 51 const struct cred *cred; 52 }; 53 54 /* 55 * Functions exported by the lockd module 56 */ 57 58 extern struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init); 59 extern void nlmclnt_done(struct nlm_host *host); 60 extern struct rpc_clnt *nlmclnt_rpc_clnt(struct nlm_host *host); 61 62 /* 63 * NLM client operations provide a means to modify RPC processing of NLM 64 * requests. Callbacks receive a pointer to data passed into the call to 65 * nlmclnt_proc(). 66 */ 67 struct nlmclnt_operations { 68 /* Called on successful allocation of nlm_rqst, use for allocation or 69 * reference counting. */ 70 void (*nlmclnt_alloc_call)(void *); 71 72 /* Called in rpc_task_prepare for unlock. A return value of true 73 * indicates the callback has put the task to sleep on a waitqueue 74 * and NLM should not call rpc_call_start(). */ 75 bool (*nlmclnt_unlock_prepare)(struct rpc_task*, void *); 76 77 /* Called when the nlm_rqst is freed, callbacks should clean up here */ 78 void (*nlmclnt_release_call)(void *); 79 }; 80 81 extern int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl, void *data); 82 extern int lockd_up(struct net *net, const struct cred *cred); 83 extern void lockd_down(struct net *net); 84 85 #endif /* LINUX_LOCKD_BIND_H */ 86