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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Chuck Lever
5829352e56
The NLM protocol constants and status codes in nlm.h are needed only by lockd's internal implementation. NFS client code and NFSD interact with lockd through the stable API in bind.h and have no direct use for protocol-level definitions. Exposing these definitions globally via bind.h creates unnecessary coupling between lockd internals and its consumers. Moving nlm.h from include/linux/lockd/ to fs/lockd/ clarifies the API boundary: bind.h provides the lockd service interface, while nlm.h remains available only to code within fs/lockd/ that implements the protocol. Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/include/linux/lockd/bind.h
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*
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* This is the part of lockd visible to nfsd and the nfs client.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef LINUX_LOCKD_BIND_H
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#define LINUX_LOCKD_BIND_H
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struct file_lock;
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struct nfs_fh;
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struct svc_rqst;
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struct rpc_task;
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struct rpc_clnt;
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struct super_block;
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/*
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* This is the set of functions for lockd->nfsd communication
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*/
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struct nlmsvc_binding {
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int (*fopen)(struct svc_rqst *rqstp, struct nfs_fh *f,
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struct file **filp, int flags);
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void (*fclose)(struct file *filp);
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};
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extern const struct nlmsvc_binding *nlmsvc_ops;
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/*
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* Similar to nfs_client_initdata, but without the NFS-specific
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* rpc_ops field.
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*/
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struct nlmclnt_initdata {
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const char *hostname;
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const struct sockaddr *address;
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size_t addrlen;
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unsigned short protocol;
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u32 nfs_version;
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int noresvport;
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struct net *net;
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const struct nlmclnt_operations *nlmclnt_ops;
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const struct cred *cred;
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};
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/*
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* Functions exported by the lockd module
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*/
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extern struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init);
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extern void nlmclnt_done(struct nlm_host *host);
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extern struct rpc_clnt *nlmclnt_rpc_clnt(struct nlm_host *host);
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extern void nlmclnt_shutdown_rpc_clnt(struct nlm_host *host);
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/*
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* NLM client operations provide a means to modify RPC processing of NLM
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* requests. Callbacks receive a pointer to data passed into the call to
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* nlmclnt_proc().
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*/
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struct nlmclnt_operations {
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/* Called on successful allocation of nlm_rqst, use for allocation or
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* reference counting. */
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void (*nlmclnt_alloc_call)(void *);
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/* Called in rpc_task_prepare for unlock. A return value of true
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* indicates the callback has put the task to sleep on a waitqueue
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* and NLM should not call rpc_call_start(). */
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bool (*nlmclnt_unlock_prepare)(struct rpc_task*, void *);
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/* Called when the nlm_rqst is freed, callbacks should clean up here */
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void (*nlmclnt_release_call)(void *);
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};
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extern int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl, void *data);
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extern int lockd_up(struct net *net, const struct cred *cred);
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extern void lockd_down(struct net *net);
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/*
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* Cluster failover support
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*/
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int nlmsvc_unlock_all_by_sb(struct super_block *sb);
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int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
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#endif /* LINUX_LOCKD_BIND_H */
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