FreeBSD/Linux Kernel Cross Reference
sys/fs/nfs/nfsrvcache.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1989, 1993
      *      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.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _NFS_NFSRVCACHE_H_
    #define _NFS_NFSRVCACHE_H_
    
    /*
     * Definitions for the server recent request cache
     */
    #define NFSRVCACHE_MAX_SIZE     2048
    #define NFSRVCACHE_MIN_SIZE       64
    
    #define NFSRVCACHE_HASHSIZE     500
    
    /* Cache table entry. */
    struct nfsrvcache {
            LIST_ENTRY(nfsrvcache) rc_hash;         /* Hash chain */
            LIST_ENTRY(nfsrvcache) rc_ahash;        /* ACK hash chain */
            TAILQ_ENTRY(nfsrvcache) rc_lru;         /* UDP lru chain */
            u_int32_t       rc_xid;                 /* rpc id number */
            time_t          rc_timestamp;           /* Time done */
            union {
                    mbuf_t repmb;                   /* Reply mbuf list OR */
                    int repstat;                    /* Reply status */
            } rc_un;
            union {
                    struct {
                            union nethostaddr haddr; /* Host address */
                    } udp;
                    struct {
                            u_int64_t       sockref;
                            u_int32_t       len;
                            u_int32_t       tcpseq;
                            int16_t         refcnt;
                            u_int16_t       cksum;
                            time_t          cachetime;
                            int             acked;
                    } ot;
            } rc_un2;
            u_int16_t       rc_proc;                /* rpc proc number */
            u_int16_t       rc_flag;                /* Flag bits */
    };
    
    #define rc_reply        rc_un.repmb
    #define rc_status       rc_un.repstat
    #define rc_inet         rc_un2.udp.haddr.had_inet.s_addr
    #define rc_inet6        rc_un2.udp.haddr.had_inet6
    #define rc_haddr        rc_un2.udp.haddr
    #define rc_sockref      rc_un2.ot.sockref
    #define rc_tcpseq       rc_un2.ot.tcpseq
    #define rc_refcnt       rc_un2.ot.refcnt
    #define rc_reqlen       rc_un2.ot.len
    #define rc_cksum        rc_un2.ot.cksum
    #define rc_cachetime    rc_un2.ot.cachetime
    #define rc_acked        rc_un2.ot.acked
    
    /* TCP ACK values */
    #define RC_NO_SEQ               0
    #define RC_NO_ACK               1
    #define RC_ACK                  2
    #define RC_NACK                 3
    
    /* Return values */
    #define RC_DROPIT               0
    #define RC_REPLY                1
    #define RC_DOIT                 2
   
   /* Flag bits */
   #define RC_LOCKED       0x0001
   #define RC_WANTED       0x0002
   #define RC_REPSTATUS    0x0004
   #define RC_REPMBUF      0x0008
   #define RC_UDP          0x0010
   #define RC_INETIPV6     0x0020
   #define RC_INPROG       0x0040
   #define RC_NFSV2        0x0100
   #define RC_NFSV3        0x0200
   #define RC_NFSV4        0x0400
   #define RC_NFSVERS      (RC_NFSV2 | RC_NFSV3 | RC_NFSV4)
   #define RC_REFCNT       0x0800
   #define RC_SAMETCPCONN  0x1000
   
   LIST_HEAD(nfsrvhashhead, nfsrvcache);
   
   /* The fine-grained locked cache hash table for TCP. */
   struct nfsrchash_bucket {
           struct mtx              mtx;
           struct nfsrvhashhead    tbl;
   };
   
   #endif  /* _NFS_NFSRVCACHE_H_ */

Cache object: 78706383c23283da93a0bb13086c61a6