79d2dfdaa6
user-mode lock manager, build a kernel with the NFSLOCKD option and add '-k' to 'rpc_lockd_flags' in rc.conf. Highlights include: * Thread-safe kernel RPC client - many threads can use the same RPC client handle safely with replies being de-multiplexed at the socket upcall (typically driven directly by the NIC interrupt) and handed off to whichever thread matches the reply. For UDP sockets, many RPC clients can share the same socket. This allows the use of a single privileged UDP port number to talk to an arbitrary number of remote hosts. * Single-threaded kernel RPC server. Adding support for multi-threaded server would be relatively straightforward and would follow approximately the Solaris KPI. A single thread should be sufficient for the NLM since it should rarely block in normal operation. * Kernel mode NLM server supporting cancel requests and granted callbacks. I've tested the NLM server reasonably extensively - it passes both my own tests and the NFS Connectathon locking tests running on Solaris, Mac OS X and Ubuntu Linux. * Userland NLM client supported. While the NLM server doesn't have support for the local NFS client's locking needs, it does have to field async replies and granted callbacks from remote NLMs that the local client has contacted. We relay these replies to the userland rpc.lockd over a local domain RPC socket. * Robust deadlock detection for the local lock manager. In particular it will detect deadlocks caused by a lock request that covers more than one blocking request. As required by the NLM protocol, all deadlock detection happens synchronously - a user is guaranteed that if a lock request isn't rejected immediately, the lock will eventually be granted. The old system allowed for a 'deferred deadlock' condition where a blocked lock request could wake up and find that some other deadlock-causing lock owner had beaten them to the lock. * Since both local and remote locks are managed by the same kernel locking code, local and remote processes can safely use file locks for mutual exclusion. Local processes have no fairness advantage compared to remote processes when contending to lock a region that has just been unlocked - the local lock manager enforces a strict first-come first-served model for both local and remote lockers. Sponsored by: Isilon Systems PR: 95247 107555 115524 116679 MFC after: 2 weeks
120 lines
3.8 KiB
C
120 lines
3.8 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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struct nlm_host;
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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 'rqstp' 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.
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*/
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extern struct nlm_host *nlm_find_host_by_name(const char *name,
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struct svc_req *rqstp);
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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.
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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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* 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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* 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. Returns the NLM host that
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* matches the RPC arguments.
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*/
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extern struct nlm_host *nlm_do_test(nlm4_testargs *argp,
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nlm4_testres *result, struct svc_req *rqstp);
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/*
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* Implementation for lock setting RPCs. Returns the NLM host that
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* matches the RPC arguments. If monitor is TRUE, set up an NSM
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* monitor for this host.
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*/
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extern struct nlm_host *nlm_do_lock(nlm4_lockargs *argp,
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nlm4_res *result, struct svc_req *rqstp, bool_t monitor);
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/*
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* Implementation for cancelling a pending lock request. Returns the
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* NLM host that matches the RPC arguments.
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*/
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extern struct nlm_host *nlm_do_cancel(nlm4_cancargs *argp,
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nlm4_res *result, struct svc_req *rqstp);
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/*
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* Implementation for unlocking RPCs. Returns the NLM host that
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* matches the RPC arguments.
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*/
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extern struct nlm_host *nlm_do_unlock(nlm4_unlockargs *argp,
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nlm4_res *result, struct svc_req *rqstp);
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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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* Find an RPC transport that can be used to communicate with the
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* userland part of lockd.
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*/
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extern CLIENT *nlm_user_lockd(void);
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#endif
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#endif
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