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Annotation of Net2/nfs/nfs.h, revision 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 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. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)nfs.h       7.11 (Berkeley) 4/19/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * Tunable constants for nfs
        !            41:  */
        !            42: 
        !            43: #define        NFS_MAXIOVEC    34
        !            44: #define NFS_HZ         10              /* Ticks per second for NFS timeouts */
        !            45: #define        NFS_TIMEO       (1*NFS_HZ)      /* Default timeout = 1 second */
        !            46: #define        NFS_MINTIMEO    (NFS_HZ)        /* Min timeout to use */
        !            47: #define        NFS_MAXTIMEO    (60*NFS_HZ)     /* Max timeout to backoff to */
        !            48: #define        NFS_MINIDEMTIMEO (2*NFS_HZ)     /* Min timeout for non-idempotent ops*/
        !            49: #define        NFS_RELIABLETIMEO (5*NFS_HZ)    /* Min timeout on reliable sockets */
        !            50: #define        NFS_MAXREXMIT   100             /* Stop counting after this many */
        !            51: #define        NFS_MAXWINDOW   1024            /* Max number of outstanding requests */
        !            52: #define        NFS_RETRANS     10              /* Num of retrans for soft mounts */
        !            53: #define NFS_FISHY      8               /* Host not responding at this count */
        !            54: #define        NFS_ATTRTIMEO   5               /* Attribute cache timeout in sec */
        !            55: #define        NFS_WSIZE       8192            /* Def. write data size <= 8192 */
        !            56: #define        NFS_RSIZE       8192            /* Def. read data size <= 8192 */
        !            57: #define        NFS_MAXREADDIR  NFS_MAXDATA     /* Max. size of directory read */
        !            58: #define        NFS_MAXASYNCDAEMON 20           /* Max. number async_daemons runable */
        !            59: #define        NFS_DIRBLKSIZ   1024            /* Size of an NFS directory block */
        !            60: #define        NMOD(a)         ((a) % nfs_asyncdaemons)
        !            61: 
        !            62: /*
        !            63:  * The set of signals the interrupt an I/O in progress for NFSMNT_INT mounts.
        !            64:  * What should be in this set is open to debate, but I believe that since
        !            65:  * I/O system calls on ufs are never interrupted by signals the set should
        !            66:  * be minimal. My reasoning is that many current programs that use signals
        !            67:  * such as SIGALRM will not expect file I/O system calls to be interrupted
        !            68:  * by them and break.
        !            69:  */
        !            70: #define        NFSINT_SIGMASK  (sigmask(SIGINT)|sigmask(SIGTERM)|sigmask(SIGKILL)| \
        !            71:                         sigmask(SIGHUP)|sigmask(SIGQUIT))
        !            72: 
        !            73: /*
        !            74:  * Socket errors ignored for connectionless sockets??
        !            75:  * For now, ignore them all
        !            76:  */
        !            77: #define        NFSIGNORE_SOERROR(s, e) \
        !            78:                ((e) != EINTR && (e) != ERESTART && (e) != EWOULDBLOCK && \
        !            79:                ((s) & PR_CONNREQUIRED) == 0)
        !            80: 
        !            81: /*
        !            82:  * Nfs outstanding request list element
        !            83:  */
        !            84: struct nfsreq {
        !            85:        struct nfsreq   *r_next;
        !            86:        struct nfsreq   *r_prev;
        !            87:        struct mbuf     *r_mreq;
        !            88:        struct mbuf     *r_mrep;
        !            89:        struct nfsmount *r_nmp;
        !            90:        struct vnode    *r_vp;
        !            91:        u_long          r_xid;
        !            92:        short           r_flags;        /* flags on request, see below */
        !            93:        short           r_retry;        /* max retransmission count */
        !            94:        short           r_rexmit;       /* current retrans count */
        !            95:        short           r_timer;        /* tick counter on reply */
        !            96:        short           r_timerinit;    /* reinit tick counter on reply */
        !            97:        struct proc     *r_procp;       /* Proc that did I/O system call */
        !            98: };
        !            99: 
        !           100: /* Flag values for r_flags */
        !           101: #define R_TIMING       0x01            /* timing request (in mntp) */
        !           102: #define R_SENT         0x02            /* request has been sent */
        !           103: #define        R_SOFTTERM      0x04            /* soft mnt, too many retries */
        !           104: #define        R_INTR          0x08            /* intr mnt, signal pending */
        !           105: #define        R_SOCKERR       0x10            /* Fatal error on socket */
        !           106: #define        R_TPRINTFMSG    0x20            /* Did a tprintf msg. */
        !           107: #define        R_MUSTRESEND    0x40            /* Must resend request */
        !           108: 
        !           109: #ifdef KERNEL
        !           110: /*
        !           111:  * Silly rename structure that hangs off the nfsnode until the name
        !           112:  * can be removed by nfs_inactive()
        !           113:  */
        !           114: struct sillyrename {
        !           115:        nfsv2fh_t s_fh;
        !           116:        struct  ucred *s_cred;
        !           117:        struct  vnode *s_dvp;
        !           118:        u_short s_namlen;
        !           119:        char    s_name[20];
        !           120: };
        !           121: 
        !           122: /* And its flag values */
        !           123: #define REMOVE         0
        !           124: #define        RMDIR           1
        !           125: #endif /* KERNEL */
        !           126: 
        !           127: /*
        !           128:  * Stats structure
        !           129:  */
        !           130: struct nfsstats {
        !           131:        int     attrcache_hits;
        !           132:        int     attrcache_misses;
        !           133:        int     lookupcache_hits;
        !           134:        int     lookupcache_misses;
        !           135:        int     direofcache_hits;
        !           136:        int     direofcache_misses;
        !           137:        int     biocache_reads;
        !           138:        int     read_bios;
        !           139:        int     read_physios;
        !           140:        int     biocache_writes;
        !           141:        int     write_bios;
        !           142:        int     write_physios;
        !           143:        int     biocache_readlinks;
        !           144:        int     readlink_bios;
        !           145:        int     biocache_readdirs;
        !           146:        int     readdir_bios;
        !           147:        int     rpccnt[NFS_NPROCS];
        !           148:        int     rpcretries;
        !           149:        int     srvrpccnt[NFS_NPROCS];
        !           150:        int     srvrpc_errs;
        !           151:        int     srv_errs;
        !           152:        int     rpcrequests;
        !           153:        int     rpctimeouts;
        !           154:        int     rpcunexpected;
        !           155:        int     rpcinvalid;
        !           156:        int     srvcache_inproghits;
        !           157:        int     srvcache_idemdonehits;
        !           158:        int     srvcache_nonidemdonehits;
        !           159:        int     srvcache_misses;
        !           160: };
        !           161: 
        !           162: #ifdef KERNEL
        !           163: struct nfsstats nfsstats;
        !           164: #endif /* KERNEL */

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