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