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Annotation of Net2/nfs/nfsrvcache.h, revision 1.1.1.1

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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