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 * @(#)nfs.h 7.5 (Berkeley) 02/16/90 21 */ 22 23 /* 24 * Tunable constants for nfs 25 */ 26 27 #define MAX_IOVEC 10 28 #define NFS_HZ 10 /* Ticks per second for NFS timeouts */ 29 #define NFS_TIMEO (1*NFS_HZ) /* Default timeout = 1 second */ 30 #define NFS_MINTIMEO (NFS_HZ/2) /* Min timeout to use */ 31 #define NFS_MAXTIMEO (60*NFS_HZ) /* Max timeout to backoff to */ 32 #define NFS_MAXREXMIT 100 /* Stop counting after this many */ 33 #define NFS_MAXWINDOW 1024 /* Max number of outstanding requests */ 34 #define NFS_RETRANS 10 /* Num of retrans for soft mounts */ 35 #define NFS_FISHY 6 /* Host not responding at this count */ 36 #define NFS_ATTRTIMEO 5 /* Attribute cache timeout in sec */ 37 #define NFS_WSIZE 8192 /* Max. write data size <= 8192 */ 38 #define NFS_RSIZE 8192 /* Max. read data size <= 8192 */ 39 #define MAX_READDIR NFS_RSIZE /* Max. size of directory read */ 40 #define MAX_ASYNCDAEMON 20 /* Max. number async_daemons runnable */ 41 #define NMOD(a) ((a) % nfs_asyncdaemons) 42 43 44 /* 45 * Nfs outstanding request list element 46 */ 47 struct nfsreq { 48 struct nfsreq *r_next; 49 struct nfsreq *r_prev; 50 struct mbuf *r_mreq; 51 struct mbuf *r_mrep; 52 struct nfsmount *r_mntp; 53 struct vnode *r_vp; 54 int r_msiz; 55 u_long r_xid; 56 short r_flags; /* flags on request, see below */ 57 short r_retry; /* max retransmission count */ 58 short r_rexmit; /* current retrans count */ 59 short r_timer; /* tick counter on reply */ 60 short r_timerinit; /* reinit tick counter on reply */ 61 }; 62 63 /* Flag values for r_flags */ 64 #define R_TIMING 0x01 /* timing request (in mntp) */ 65 #define R_SENT 0x02 /* request has been sent */ 66 67 #ifdef KERNEL 68 /* 69 * Silly rename structure that hangs off the nfsnode until the name 70 * can be removed by nfs_inactive() 71 */ 72 struct sillyrename { 73 int s_flag; 74 nfsv2fh_t s_fh; 75 struct nameidata s_namei; 76 }; 77 78 /* And its flag values */ 79 #define REMOVE 0 80 #define RMDIR 1 81 #endif /* KERNEL */ 82 83 /* 84 * Stats structure 85 */ 86 struct nfsstats { 87 int attrcache_hits; 88 int attrcache_misses; 89 int lookupcache_hits; 90 int lookupcache_misses; 91 int biocache_reads; 92 int read_bios; 93 int read_physios; 94 int biocache_writes; 95 int write_bios; 96 int write_physios; 97 int rpccnt[NFS_NPROCS]; 98 int rpcretries; 99 int srvrpccnt[NFS_NPROCS]; 100 int srvrpc_errs; 101 int srv_errs; 102 int rpcrequests; 103 int rpctimeouts; 104 int rpcunexpected; 105 int rpcinvalid; 106 int srvcache_inproghits; 107 int srvcache_idemdonehits; 108 int srvcache_nonidemdonehits; 109 int srvcache_misses; 110 }; 111 112 #ifdef KERNEL 113 struct nfsstats nfsstats; 114 #endif /* KERNEL */ 115