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Annotation of 43BSDReno/sys/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 is only permitted until one year after the first shipment
                      9:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
                     10:  * binary forms are permitted provided that: (1) source distributions retain
                     11:  * this entire copyright notice and comment, and (2) distributions including
                     12:  * binaries display the following acknowledgement:  This product includes
                     13:  * software developed by the University of California, Berkeley and its
                     14:  * contributors'' in the documentation or other materials provided with the
                     15:  * distribution and in all advertising materials mentioning features or use
                     16:  * of this software.  Neither the name of the University nor the names of
                     17:  * its contributors may be used to endorse or promote products derived from
                     18:  * this software without specific prior written permission.
                     19:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     20:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     21:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     22:  *
                     23:  *     @(#)nfsrvcache.h        7.3 (Berkeley) 6/28/90
                     24:  */
                     25: 
                     26: /*
                     27:  * Definitions for the server recent request cache
                     28:  */
                     29: 
                     30: #define        NFSRVCACHESIZ   128
                     31: #define        NFSRCHSZ        32
                     32: 
                     33: struct nfsrvcache {
                     34:        struct  nfsrvcache *rc_chain[2];        /* Hash chain links */
                     35:        struct  nfsrvcache *rc_next;    /* Lru list */
                     36:        struct  nfsrvcache *rc_prev;
                     37:        int     rc_state;               /* Current state of request */
                     38:        int     rc_flag;                /* Flag bits */
                     39:        struct  mbuf rc_nam;            /* Sockaddr of requestor */
                     40:        u_long  rc_xid;                 /* rpc id number */
                     41:        int     rc_proc;                /* rpc proc number */
                     42:        long    rc_timestamp;           /* Time stamp */
                     43:        union {
                     44:                struct mbuf *rc_repmb;  /* Reply mbuf list OR */
                     45:                int rc_repstat;         /* Reply status */
                     46:        } rc_un;
                     47: };
                     48: 
                     49: #define        rc_forw         rc_chain[0]
                     50: #define        rc_back         rc_chain[1]
                     51: #define        rc_status       rc_un.rc_repstat
                     52: #define        rc_reply        rc_un.rc_repmb
                     53: 
                     54: #define        put_at_head(rp) \
                     55:                (rp)->rc_prev->rc_next = (rp)->rc_next; \
                     56:                (rp)->rc_next->rc_prev = (rp)->rc_prev; \
                     57:                (rp)->rc_next = nfsrvcachehead.rc_next; \
                     58:                (rp)->rc_next->rc_prev = (rp); \
                     59:                nfsrvcachehead.rc_next = (rp); \
                     60:                (rp)->rc_prev = &nfsrvcachehead
                     61: 
                     62: /* Cache entry states */
                     63: #define        RC_UNUSED       0
                     64: #define        RC_INPROG       1
                     65: #define        RC_DONE         2
                     66: 
                     67: /* Return values */
                     68: #define        RC_DROPIT       0
                     69: #define        RC_REPLY        1
                     70: #define        RC_DOIT         2
                     71: 
                     72: /* Flag bits */
                     73: #define        RC_LOCKED       0x1
                     74: #define        RC_WANTED       0x2
                     75: #define        RC_REPSTATUS    0x4
                     76: #define        RC_REPMBUF      0x8
                     77: 
                     78: /* Delay time after completion that request is dropped */
                     79: #define        RC_DELAY        2               /* seconds */
                     80: 

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