sys/vfs/nfs/nfsrvcache.h

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)nfsrvcache.h        8.3 (Berkeley) 3/30/95
  33  * $FreeBSD: src/sys/nfs/nfsrvcache.h,v 1.12 1999/08/28 00:50:03 peter Exp $
  34  * $DragonFly: src/sys/vfs/nfs/nfsrvcache.h,v 1.2 2003/06/17 04:28:54 dillon Exp $
  35  */
  36
  37
  38 #ifndef _NFS_NFSRVCACHE_H_
  39 #define _NFS_NFSRVCACHE_H_
  40
  41 #include <sys/queue.h>
  42
  43 /*
  44  * Definitions for the server recent request cache
  45  */
  46
  47 #define NFSRVCACHE_MAX_SIZE     (2048)
  48 #define NFSRVCACHE_MIN_SIZE     (64)
  49
  50 struct nfsrvcache {
  51         TAILQ_ENTRY(nfsrvcache) rc_lru;         /* LRU chain */
  52         LIST_ENTRY(nfsrvcache) rc_hash;         /* Hash chain */
  53         u_int32_t rc_xid;                       /* rpc id number */
  54         union {
  55                 struct mbuf *ru_repmb;          /* Reply mbuf list OR */
  56                 int ru_repstat;                 /* Reply status */
  57         } rc_un;
  58         union nethostaddr rc_haddr;             /* Host address */
  59         u_int32_t rc_proc;                      /* rpc proc number */
  60         u_char  rc_state;               /* Current state of request */
  61         u_char  rc_flag;                /* Flag bits */
  62 };
  63
  64 #define rc_reply        rc_un.ru_repmb
  65 #define rc_status       rc_un.ru_repstat
  66 #define rc_inetaddr     rc_haddr.had_inetaddr
  67 #define rc_nam          rc_haddr.had_nam
  68
  69 /* Cache entry states */
  70 #define RC_UNUSED       0
  71 #define RC_INPROG       1
  72 #define RC_DONE         2
  73
  74 /* Return values */
  75 #define RC_DROPIT       0
  76 #define RC_REPLY        1
  77 #define RC_DOIT         2
  78 #define RC_CHECKIT      3
  79
  80 /* Flag bits */
  81 #define RC_LOCKED       0x01
  82 #define RC_WANTED       0x02
  83 #define RC_REPSTATUS    0x04
  84 #define RC_REPMBUF      0x08
  85 #define RC_NQNFS        0x10
  86 #define RC_INETADDR     0x20
  87 #define RC_NAM          0x40
  88
  89 #endif