c675522fc4
provides the correct semantics for flock(2) style locks which are used by the lockf(1) command line tool and the pidfile(3) library. It also implements recovery from server restarts and ensures that dirty cache blocks are written to the server before obtaining locks (allowing multiple clients to use file locking to safely share data). Sponsored by: Isilon Systems PR: 94256 MFC after: 2 weeks
216 lines
7.3 KiB
C
216 lines
7.3 KiB
C
/*-
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* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
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* Authors: Doug Rabson <dfr@rabson.org>
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* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NLM_NLM_H_
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#define _NLM_NLM_H_
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#ifdef _KERNEL
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#ifdef _SYS_MALLOC_H_
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MALLOC_DECLARE(M_NLM);
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#endif
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/*
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* This value is added to host system IDs when recording NFS client
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* locks in the local lock manager.
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*/
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#define NLM_SYSID_CLIENT 0x1000000
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struct nlm_host;
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struct vnode;
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extern struct timeval nlm_zero_tv;
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extern int nlm_nsm_state;
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/*
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* Copy a struct netobj.
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*/
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extern void nlm_copy_netobj(struct netobj *dst, struct netobj *src,
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struct malloc_type *type);
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/*
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* Search for an existing NLM host that matches the given name
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* (typically the caller_name element of an nlm4_lock). If none is
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* found, create a new host. If 'addr' is non-NULL, record the remote
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* address of the host so that we can call it back for async
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* responses. If 'vers' is greater than zero then record the NLM
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* program version to use to communicate with this client. The host
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* reference count is incremented - the caller must call
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* nlm_host_release when it has finished using it.
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*/
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extern struct nlm_host *nlm_find_host_by_name(const char *name,
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const struct sockaddr *addr, rpcvers_t vers);
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/*
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* Search for an existing NLM host that matches the given remote
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* address. If none is found, create a new host with the requested
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* address and remember 'vers' as the NLM protocol version to use for
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* that host. The host reference count is incremented - the caller
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* must call nlm_host_release when it has finished using it.
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*/
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extern struct nlm_host *nlm_find_host_by_addr(const struct sockaddr *addr,
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int vers);
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/*
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* Register this NLM host with the local NSM so that we can be
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* notified if it reboots.
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*/
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extern void nlm_host_monitor(struct nlm_host *host, int state);
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/*
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* Decrement the host reference count, freeing resources if the
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* reference count reaches zero.
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*/
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extern void nlm_host_release(struct nlm_host *host);
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/*
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* Return an RPC client handle that can be used to talk to the NLM
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* running on the given host.
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*/
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extern CLIENT *nlm_host_get_rpc(struct nlm_host *host);
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/*
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* Return the system ID for a host.
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*/
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extern int nlm_host_get_sysid(struct nlm_host *host);
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/*
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* Return the remote NSM state value for a host.
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*/
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extern int nlm_host_get_state(struct nlm_host *host);
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/*
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* When sending a blocking lock request, we need to track the request
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* in our waiting lock list. We add an entry to the waiting list
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* before we send the lock RPC so that we can cope with a granted
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* message arriving at any time. Call this function before sending the
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* lock rpc. If the lock succeeds, call nlm_deregister_wait_lock with
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* the handle this function returns, otherwise nlm_wait_lock. Both
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* will remove the entry from the waiting list.
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*/
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extern void *nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp);
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/*
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* Deregister a blocking lock request. Call this if the lock succeeded
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* without blocking.
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*/
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extern void nlm_deregister_wait_lock(void *handle);
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/*
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* Wait for a granted callback for a blocked lock request, waiting at
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* most timo ticks. If no granted message is received within the
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* timeout, return EWOULDBLOCK. If a signal interrupted the wait,
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* return EINTR - the caller must arrange to send a cancellation to
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* the server. In both cases, the request is removed from the waiting
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* list.
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*/
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extern int nlm_wait_lock(void *handle, int timo);
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/*
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* Cancel any pending waits for this vnode - called on forcible unmounts.
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*/
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extern void nlm_cancel_wait(struct vnode *vp);
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/*
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* Called when a host restarts.
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*/
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extern void nlm_sm_notify(nlm_sm_status *argp);
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/*
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* Implementation for lock testing RPCs. If the request was handled
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* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
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* handle which can be used to send an async rpc reply. Returns zero
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* if the request was handled, or a suitable unix error code
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* otherwise.
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*/
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extern int nlm_do_test(nlm4_testargs *argp, nlm4_testres *result,
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struct svc_req *rqstp, CLIENT **rpcp);
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/*
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* Implementation for lock setting RPCs. If the request was handled
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* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
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* handle which can be used to send an async rpc reply. Returns zero
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* if the request was handled, or a suitable unix error code
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* otherwise.
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*/
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extern int nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result,
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struct svc_req *rqstp, bool_t monitor, CLIENT **rpcp);
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/*
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* Implementation for cancelling a pending lock request. If the
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* request was handled successfully and rpcp is non-NULL, *rpcp is set
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* to an RPC client handle which can be used to send an async rpc
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* reply. Returns zero if the request was handled, or a suitable unix
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* error code otherwise.
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*/
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extern int nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result,
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struct svc_req *rqstp, CLIENT **rpcp);
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/*
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* Implementation for unlocking RPCs. If the request was handled
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* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
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* handle which can be used to send an async rpc reply. Returns zero
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* if the request was handled, or a suitable unix error code
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* otherwise.
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*/
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extern int nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result,
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struct svc_req *rqstp, CLIENT **rpcp);
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/*
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* Implementation for granted RPCs. If the request was handled
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* successfully and rpcp is non-NULL, *rpcp is set to an RPC client
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* handle which can be used to send an async rpc reply. Returns zero
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* if the request was handled, or a suitable unix error code
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* otherwise.
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*/
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extern int nlm_do_granted(nlm4_testargs *argp, nlm4_res *result,
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struct svc_req *rqstp, CLIENT **rpcp);
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/*
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* Free all locks associated with the hostname argp->name.
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*/
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extern void nlm_do_free_all(nlm4_notify *argp);
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/*
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* Recover client lock state after a server reboot.
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*/
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extern void nlm_client_recovery(struct nlm_host *);
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/*
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* Interface from NFS client code to the NLM.
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*/
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struct vop_advlock_args;
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struct vop_reclaim_args;
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extern int nlm_advlock(struct vop_advlock_args *ap);
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extern int nlm_reclaim(struct vop_reclaim_args *ap);
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#endif
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#endif
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