forked from mirrors/linux
7f024fcd5c
We shouldn't really be using a read-only file descriptor to take a write lock. Most filesystems will put up with it. But NFS, for example, won't. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
83 lines
2.2 KiB
C
83 lines
2.2 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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#include <linux/lockd/nlm.h>
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/* need xdr-encoded error codes too, so... */
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#include <linux/lockd/xdr.h>
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#ifdef CONFIG_LOCKD_V4
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#include <linux/lockd/xdr4.h>
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#endif
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/* Dummy declarations */
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struct svc_rqst;
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struct rpc_task;
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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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__be32 (*fopen)(struct svc_rqst *,
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struct nfs_fh *,
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struct file **,
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int mode);
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void (*fclose)(struct file *);
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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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/*
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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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#endif /* LINUX_LOCKD_BIND_H */
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