This is xnu-6153.11.26. See this file in:
/*
 * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)nfsrvcache.h	8.3 (Berkeley) 3/30/95
 * FreeBSD-Id: nfsrvcache.h,v 1.9 1997/06/03 17:22:47 dfr Exp $
 */


#ifndef _NFS_NFSRVCACHE_H_
#define _NFS_NFSRVCACHE_H_

#include <sys/appleapiopts.h>

#ifdef __APPLE_API_PRIVATE
/*
 * Definitions for the server recent request cache
 */

/* Network address hash list element */
union nethostaddr {
	in_addr_t had_inetaddr;
	struct in6_addr had_inet6addr;
	mbuf_t had_nam;
};

#define NFSRVCACHESIZ   64

struct nfsrvcache {
	TAILQ_ENTRY(nfsrvcache) rc_lru;         /* LRU chain */
	LIST_ENTRY(nfsrvcache) rc_hash;         /* Hash chain */
	u_int32_t       rc_xid;                         /* rpc id number */
	union {
		mbuf_t ru_repmb;                /* Reply mbuf list OR */
		int ru_repstat;                 /* Reply status */
	} rc_un;
	sa_family_t rc_family;                  /* address family */
	union nethostaddr rc_haddr;             /* Host address */
	u_int32_t rc_proc;                      /* rpc proc number */
	u_char  rc_state;               /* Current state of request */
	u_char  rc_flag;                /* Flag bits */
};

#define rc_reply        rc_un.ru_repmb
#define rc_status       rc_un.ru_repstat
#define rc_inetaddr     rc_haddr.had_inetaddr
#define rc_inet6addr    rc_haddr.had_inet6addr
#define rc_nam          rc_haddr.had_nam

/* Cache entry states */
#define RC_UNUSED       0
#define RC_INPROG       1
#define RC_DONE         2

/* Return values */
#define RC_DROPIT       0
#define RC_REPLY        1
#define RC_DOIT         2
#define RC_CHECKIT      3

/* Flag bits */
#define RC_LOCKED       0x01
#define RC_WANTED       0x02
#define RC_REPSTATUS    0x04
#define RC_REPMBUF      0x08
#define RC_INETADDR     0x20
#define RC_NAM          0x40

extern lck_grp_t *nfsrv_reqcache_lck_grp;
extern lck_mtx_t *nfsrv_reqcache_mutex;

#endif /* __APPLE_API_PRIVATE */
#endif /* _NFS_NFSRVCACHE_H_ */