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Annotation of Net2/nfs/nfsrvcache.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Rick Macklem at The University of Guelph.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)nfsrvcache.h        7.3 (Berkeley) 6/28/90
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * Definitions for the server recent request cache
        !            41:  */
        !            42: 
        !            43: #define        NFSRVCACHESIZ   128
        !            44: #define        NFSRCHSZ        32
        !            45: 
        !            46: struct nfsrvcache {
        !            47:        struct  nfsrvcache *rc_chain[2];        /* Hash chain links */
        !            48:        struct  nfsrvcache *rc_next;    /* Lru list */
        !            49:        struct  nfsrvcache *rc_prev;
        !            50:        int     rc_state;               /* Current state of request */
        !            51:        int     rc_flag;                /* Flag bits */
        !            52:        struct  mbuf rc_nam;            /* Sockaddr of requestor */
        !            53:        u_long  rc_xid;                 /* rpc id number */
        !            54:        int     rc_proc;                /* rpc proc number */
        !            55:        long    rc_timestamp;           /* Time stamp */
        !            56:        union {
        !            57:                struct mbuf *rc_repmb;  /* Reply mbuf list OR */
        !            58:                int rc_repstat;         /* Reply status */
        !            59:        } rc_un;
        !            60: };
        !            61: 
        !            62: #define        rc_forw         rc_chain[0]
        !            63: #define        rc_back         rc_chain[1]
        !            64: #define        rc_status       rc_un.rc_repstat
        !            65: #define        rc_reply        rc_un.rc_repmb
        !            66: 
        !            67: #define        put_at_head(rp) \
        !            68:                (rp)->rc_prev->rc_next = (rp)->rc_next; \
        !            69:                (rp)->rc_next->rc_prev = (rp)->rc_prev; \
        !            70:                (rp)->rc_next = nfsrvcachehead.rc_next; \
        !            71:                (rp)->rc_next->rc_prev = (rp); \
        !            72:                nfsrvcachehead.rc_next = (rp); \
        !            73:                (rp)->rc_prev = &nfsrvcachehead
        !            74: 
        !            75: /* Cache entry states */
        !            76: #define        RC_UNUSED       0
        !            77: #define        RC_INPROG       1
        !            78: #define        RC_DONE         2
        !            79: 
        !            80: /* Return values */
        !            81: #define        RC_DROPIT       0
        !            82: #define        RC_REPLY        1
        !            83: #define        RC_DOIT         2
        !            84: 
        !            85: /* Flag bits */
        !            86: #define        RC_LOCKED       0x1
        !            87: #define        RC_WANTED       0x2
        !            88: #define        RC_REPSTATUS    0x4
        !            89: #define        RC_REPMBUF      0x8
        !            90: 
        !            91: /* Delay time after completion that request is dropped */
        !            92: #define        RC_DELAY        2               /* seconds */
        !            93: 

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