dfdcada31e
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
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/* $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
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static char *sccsid = "@(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* xdr_reference.c, Generic XDR routines impelmentation.
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*
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* Copyright (C) 1987, Sun Microsystems, Inc.
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*
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* These are the "non-trivial" xdr primitives used to serialize and de-serialize
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* "pointers". See xdr.h for more info on the interface to xdr.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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/*
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* XDR an indirect pointer
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* xdr_reference is for recursively translating a structure that is
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* referenced by a pointer inside the structure that is currently being
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* translated. pp references a pointer to storage. If *pp is null
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* the necessary storage is allocated.
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* size is the sizeof the referneced structure.
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* proc is the routine to handle the referenced structure.
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*/
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bool_t
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xdr_reference(XDR *xdrs,
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caddr_t *pp, /* the pointer to work on */
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u_int size, /* size of the object pointed to */
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xdrproc_t proc) /* xdr routine to handle the object */
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{
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caddr_t loc = *pp;
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bool_t stat;
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if (loc == NULL)
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switch (xdrs->x_op) {
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case XDR_FREE:
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return (TRUE);
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case XDR_DECODE:
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*pp = loc = (caddr_t) mem_alloc(size);
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if (loc == NULL) {
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printf("xdr_reference: out of memory");
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return (FALSE);
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}
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memset(loc, 0, size);
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break;
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case XDR_ENCODE:
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break;
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}
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stat = (*proc)(xdrs, loc);
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if (xdrs->x_op == XDR_FREE) {
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mem_free(loc, size);
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*pp = NULL;
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}
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return (stat);
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}
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/*
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* xdr_pointer():
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*
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* XDR a pointer to a possibly recursive data structure. This
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* differs with xdr_reference in that it can serialize/deserialiaze
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* trees correctly.
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*
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* What's sent is actually a union:
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*
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* union object_pointer switch (boolean b) {
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* case TRUE: object_data data;
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* case FALSE: void nothing;
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* }
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*
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* > objpp: Pointer to the pointer to the object.
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* > obj_size: size of the object.
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* > xdr_obj: routine to XDR an object.
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*
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*/
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bool_t
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xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj)
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{
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bool_t more_data;
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more_data = (*objpp != NULL);
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if (! xdr_bool(xdrs,&more_data)) {
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return (FALSE);
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}
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if (! more_data) {
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*objpp = NULL;
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return (TRUE);
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}
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return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
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}
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