sys/nfs/nfsrvcache.h

/*
 * Copyright (c) 1989 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.
 *
 *      From:   @(#)nfsrvcache.h        7.3 (Berkeley) 6/28/90
 *      $Id$
 */

#ifndef __h_nfsrvcache
#define __h_nfsrvcache 1

/*
 * Definitions for the server recent request cache
 */

#define NFSRVCACHESIZ   128
#define NFSRCHSZ        32

struct nfsrvcache {
        struct  nfsrvcache *rc_chain[2];        /* Hash chain links */
        struct  nfsrvcache *rc_next;    /* Lru list */
        struct  nfsrvcache *rc_prev;
        int     rc_state;               /* Current state of request */
        int     rc_flag;                /* Flag bits */
        struct  mbuf rc_nam;            /* Sockaddr of requestor */
        u_long  rc_xid;                 /* rpc id number */
        int     rc_proc;                /* rpc proc number */
        long    rc_timestamp;           /* Time stamp */
        union {
                struct mbuf *rc_repmb;  /* Reply mbuf list OR */
                int rc_repstat;         /* Reply status */
        } rc_un;
};

#define rc_forw         rc_chain[0]
#define rc_back         rc_chain[1]
#define rc_status       rc_un.rc_repstat
#define rc_reply        rc_un.rc_repmb

#define put_at_head(rp) \
                (rp)->rc_prev->rc_next = (rp)->rc_next; \
                (rp)->rc_next->rc_prev = (rp)->rc_prev; \
                (rp)->rc_next = nfsrvcachehead.rc_next; \
                (rp)->rc_next->rc_prev = (rp); \
                nfsrvcachehead.rc_next = (rp); \
                (rp)->rc_prev = &nfsrvcachehead

/* 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

/* Flag bits */
#define RC_LOCKED       0x1
#define RC_WANTED       0x2
#define RC_REPSTATUS    0x4
#define RC_REPMBUF      0x8

/* Delay time after completion that request is dropped */
#define RC_DELAY        2               /* seconds */


#endif /* __h_nfsrvcache */