/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _NLM_NLM_H_
#define _NLM_NLM_H_
#ifdef _KERNEL
#ifdef _SYS_MALLOC_H_
MALLOC_DECLARE(M_NLM);
#endif
/*
* This value is added to host system IDs when recording NFS client
* locks in the local lock manager.
*/
#define NLM_SYSID_CLIENT 0x1000000
struct nlm_host;
struct vnode;
extern struct timeval nlm_zero_tv;
extern int nlm_nsm_state;
/*
* Make a struct netobj.
*/
extern void nlm_make_netobj(struct netobj *dst, caddr_t srt,
size_t srcsize, struct malloc_type *type);
/*
* Copy a struct netobj.
*/
extern void nlm_copy_netobj(struct netobj *dst, struct netobj *src,
struct malloc_type *type);
/*
* Search for an existing NLM host that matches the given name
* (typically the caller_name element of an nlm4_lock). If none is
* found, create a new host. If 'addr' is non-NULL, record the remote
* address of the host so that we can call it back for async
* responses. If 'vers' is greater than zero then record the NLM
* program version to use to communicate with this client. The host
* reference count is incremented - the caller must call
* nlm_host_release when it has finished using it.
*/
extern struct nlm_host *nlm_find_host_by_name(const char *name,
const struct sockaddr *addr, rpcvers_t vers);
/*
* Search for an existing NLM host that matches the given remote
* address. If none is found, create a new host with the requested
* address and remember 'vers' as the NLM protocol version to use for
* that host. The host reference count is incremented - the caller
* must call nlm_host_release when it has finished using it.
*/
extern struct nlm_host *nlm_find_host_by_addr(const struct sockaddr *addr,
int vers);
/*
* Register this NLM host with the local NSM so that we can be
* notified if it reboots.
*/
extern void nlm_host_monitor(struct nlm_host *host, int state);
/*
* Decrement the host reference count, freeing resources if the
* reference count reaches zero.
*/
extern void nlm_host_release(struct nlm_host *host);
/*
* Return an RPC client handle that can be used to talk to the NLM
* running on the given host.
*/
extern CLIENT *nlm_host_get_rpc(struct nlm_host *host, bool_t isserver);
/*
* Return the system ID for a host.
*/
extern int nlm_host_get_sysid(struct nlm_host *host);
/*
* Return the remote NSM state value for a host.
*/
extern int nlm_host_get_state(struct nlm_host *host);
/*
* When sending a blocking lock request, we need to track the request
* in our waiting lock list. We add an entry to the waiting list
* before we send the lock RPC so that we can cope with a granted
* message arriving at any time. Call this function before sending the
* lock rpc. If the lock succeeds, call nlm_deregister_wait_lock with
* the handle this function returns, otherwise nlm_wait_lock. Both
* will remove the entry from the waiting list.
*/
extern void *nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp);
/*
* Deregister a blocking lock request. Call this if the lock succeeded
* without blocking.
*/
extern void nlm_deregister_wait_lock(void *handle);
/*
* Wait for a granted callback for a blocked lock request, waiting at
* most timo ticks. If no granted message is received within the
* timeout, return EWOULDBLOCK. If a signal interrupted the wait,
* return EINTR - the caller must arrange to send a cancellation to
* the server. In both cases, the request is removed from the waiting
* list.
*/
extern int nlm_wait_lock(void *handle, int timo);
/*
* Cancel any pending waits for this vnode - called on forcible unmounts.
*/
extern void nlm_cancel_wait(struct vnode *vp);
/*
* Called when a host restarts.
*/
extern void nlm_sm_notify(nlm_sm_status *argp);
/*
* Implementation for lock testing RPCs. If the request was handled
* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
* handle which can be used to send an async rpc reply. Returns zero
* if the request was handled, or a suitable unix error code
* otherwise.
*/
extern int nlm_do_test(nlm4_testargs *argp, nlm4_testres *result,
struct svc_req *rqstp, CLIENT **rpcp);
/*
* Implementation for lock setting RPCs. If the request was handled
* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
* handle which can be used to send an async rpc reply. Returns zero
* if the request was handled, or a suitable unix error code
* otherwise.
*/
extern int nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result,
struct svc_req *rqstp, bool_t monitor, CLIENT **rpcp);
/*
* Implementation for cancelling a pending lock request. If the
* request was handled successfully and rpcp is non-NULL, *rpcp is set
* to an RPC client handle which can be used to send an async rpc
* reply. Returns zero if the request was handled, or a suitable unix
* error code otherwise.
*/
extern int nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result,
struct svc_req *rqstp, CLIENT **rpcp);
/*
* Implementation for unlocking RPCs. If the request was handled
* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
* handle which can be used to send an async rpc reply. Returns zero
* if the request was handled, or a suitable unix error code
* otherwise.
*/
extern int nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result,
struct svc_req *rqstp, CLIENT **rpcp);
/*
* Implementation for granted RPCs. If the request was handled
* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
* handle which can be used to send an async rpc reply. Returns zero
* if the request was handled, or a suitable unix error code
* otherwise.
*/
extern int nlm_do_granted(nlm4_testargs *argp, nlm4_res *result,
struct svc_req *rqstp, CLIENT **rpcp);
/*
* Implementation for the granted result RPC. The client may reject the granted
* message, in which case we need to handle it appropriately.
*/
extern void nlm_do_granted_res(nlm4_res *argp, struct svc_req *rqstp);
/*
* Free all locks associated with the hostname argp->name.
*/
extern void nlm_do_free_all(nlm4_notify *argp);
/*
* Recover client lock state after a server reboot.
*/
extern void nlm_client_recovery(struct nlm_host *);
/*
* Interface from NFS client code to the NLM.
*/
struct vop_advlock_args;
struct vop_reclaim_args;
extern int nlm_advlock(struct vop_advlock_args *ap);
extern int nlm_reclaim(struct vop_reclaim_args *ap);
/*
* Acquire the next sysid for remote locks not handled by the NLM.
*/
extern uint32_t nlm_acquire_next_sysid(void);
#endif
#endif
