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 are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * @(#)nfsrvcache.h 7.1 (Berkeley) 12/20/89 21 */ 22 23 /* 24 * Definitions for the server recent request cache 25 */ 26 27 #define NFSRVCACHESIZ 128 28 #define NFSRCHSZ 32 29 30 struct nfsrvcache { 31 struct nfsrvcache *rc_chain[2]; /* Hash chain links */ 32 struct nfsrvcache *rc_next; /* Lru list */ 33 struct nfsrvcache *rc_prev; 34 int rc_state; /* Current state of request */ 35 int rc_flag; /* Flag bits */ 36 u_long rc_saddr; /* Internet addr. of requestor */ 37 u_long rc_xid; /* rpc id number */ 38 int rc_proc; /* rpc proc number */ 39 long rc_timestamp; /* Time stamp */ 40 union { 41 struct mbuf *rc_repmb; /* Reply mbuf list OR */ 42 int rc_repstat; /* Reply status */ 43 } rc_un; 44 }; 45 46 #define rc_forw rc_chain[0] 47 #define rc_back rc_chain[1] 48 #define rc_status rc_un.rc_repstat 49 #define rc_reply rc_un.rc_repmb 50 51 #define put_at_head(rp) \ 52 (rp)->rc_prev->rc_next = (rp)->rc_next; \ 53 (rp)->rc_next->rc_prev = (rp)->rc_prev; \ 54 (rp)->rc_next = nfsrvcachehead.rc_next; \ 55 (rp)->rc_next->rc_prev = (rp); \ 56 nfsrvcachehead.rc_next = (rp); \ 57 (rp)->rc_prev = &nfsrvcachehead 58 59 /* Cache entry states */ 60 #define RC_UNUSED 0 61 #define RC_INPROG 1 62 #define RC_DONE 2 63 64 /* Return values */ 65 #define RC_DROPIT 0 66 #define RC_REPLY 1 67 #define RC_DOIT 2 68 69 /* Flag bits */ 70 #define RC_LOCKED 0x1 71 #define RC_WANTED 0x2 72 #define RC_REPSTATUS 0x4 73 #define RC_REPMBUF 0x8 74 75 /* Delay time after completion that request is dropped */ 76 #define RC_DELAY 2 /* seconds */ 77 78