usr/src/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.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)nfsrvcache.h        7.4 (Berkeley) %G%
 */

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

#define NFSRVCACHESIZ   256
#define NFSRCHSZ        256

struct nfsrvcache {
        struct  nfsrvcache *rc_chain[2];        /* Hash chain links */
        struct  nfsrvcache *rc_lchain[2];       /* Lru list */
        u_long  rc_xid;                         /* rpc id number */
        time_t  rc_timestamp;                   /* Time stamp */
        union {
                struct mbuf *ru_repmb;          /* Reply mbuf list OR */
                int ru_repstat;                 /* Reply status */
        } rc_un;
        union nethostaddr rc_haddr;             /* Host address */
        short   rc_proc;                        /* rpc proc number */
        u_char  rc_state;               /* Current state of request */
        u_char  rc_flag;                /* Flag bits */
};

#define rc_forw         rc_chain[0]
#define rc_back         rc_chain[1]
#define rc_next         rc_lchain[0]
#define rc_prev         rc_lchain[1]
#define rc_reply        rc_un.ru_repmb
#define rc_status       rc_un.ru_repstat
#define rc_inetaddr     rc_haddr.had_inetaddr
#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

/* Flag bits */
#define RC_LOCKED       0x01
#define RC_WANTED       0x02
#define RC_REPSTATUS    0x04
#define RC_REPMBUF      0x08
#define RC_NQNFS        0x10
#define RC_INETADDR     0x20
#define RC_NAM          0x40

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