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

     /*
      * Copyright (c) 1989, 1993, 1995
      *      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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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.
     *
     *      @(#)nfs.h       8.4 (Berkeley) 5/1/95
     * $FreeBSD$
     */
    
    #ifndef _NFS_NFS_H_
    #define _NFS_NFS_H_
    
    #ifdef KERNEL
    #include "opt_nfs.h"
    #endif
    
    /*
     * Tunable constants for nfs
     */
    
    #define NFS_MAXIOVEC    34
    #define NFS_TICKINTVL   5               /* Desired time for a tick (msec) */
    #define NFS_HZ          (hz / nfs_ticks) /* Ticks/sec */
    #define NFS_TIMEO       (1 * NFS_HZ)    /* Default timeout = 1 second */
    #define NFS_MINTIMEO    (1 * NFS_HZ)    /* Min timeout to use */
    #define NFS_MAXTIMEO    (60 * NFS_HZ)   /* Max timeout to backoff to */
    #define NFS_MINIDEMTIMEO (5 * NFS_HZ)   /* Min timeout for non-idempotent ops*/
    #define NFS_MAXREXMIT   100             /* Stop counting after this many */
    #define NFS_MAXWINDOW   1024            /* Max number of outstanding requests */
    #define NFS_RETRANS     10              /* Num of retrans for soft mounts */
    #define NFS_MAXGRPS     16              /* Max. size of groups list */
    #ifndef NFS_MINATTRTIMO
    #define NFS_MINATTRTIMO 3               /* VREG attrib cache timeout in sec */
    #endif
    #ifndef NFS_MAXATTRTIMO
    #define NFS_MAXATTRTIMO 60
    #endif
    #ifndef NFS_MINDIRATTRTIMO
    #define NFS_MINDIRATTRTIMO 30           /* VDIR attrib cache timeout in sec */
    #endif
    #ifndef NFS_MAXDIRATTRTIMO
    #define NFS_MAXDIRATTRTIMO 60
    #endif
    #define NFS_WSIZE       8192            /* Def. write data size <= 8192 */
    #define NFS_RSIZE       8192            /* Def. read data size <= 8192 */
    #define NFS_READDIRSIZE 8192            /* Def. readdir size */
    #define NFS_DEFRAHEAD   1               /* Def. read ahead # blocks */
    #define NFS_MAXRAHEAD   4               /* Max. read ahead # blocks */
    #define NFS_MAXUIDHASH  64              /* Max. # of hashed uid entries/mp */
    #define NFS_MAXASYNCDAEMON      20      /* Max. number async_daemons runnable */
    #define NFS_MAXGATHERDELAY      100     /* Max. write gather delay (msec) */
    #ifndef NFS_GATHERDELAY
    #define NFS_GATHERDELAY         10      /* Default write gather delay (msec) */
    #endif
    #define NFS_DIRBLKSIZ   4096            /* Must be a multiple of DIRBLKSIZ */
    #ifdef KERNEL
    #define DIRBLKSIZ       512             /* XXX we used to use ufs's DIRBLKSIZ */
    #endif
    
    /*
     * Oddballs
     */
    #define NMOD(a)         ((a) % nfs_asyncdaemons)
    #define NFS_CMPFH(n, f, s) \
            ((n)->n_fhsize == (s) && !bcmp((caddr_t)(n)->n_fhp, (caddr_t)(f), (s)))
    #define NFS_ISV3(v)     (VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV3)
    #define NFS_SRVMAXDATA(n) \
                    (((n)->nd_flag & ND_NFSV3) ? (((n)->nd_nam2) ? \
                     NFS_MAXDGRAMDATA : NFS_MAXDATA) : NFS_V2MAXDATA)
   
   /*
    * XXX
    * The B_INVAFTERWRITE flag should be set to whatever is required by the
    * buffer cache code to say "Invalidate the block after it is written back".
    */
   #define B_INVAFTERWRITE B_NOCACHE
   
   /*
    * The IO_METASYNC flag should be implemented for local file systems.
    * (Until then, it is nothin at all.)
    */
   #ifndef IO_METASYNC
   #define IO_METASYNC     0
   #endif
   
   /*
    * Expected allocation sizes for major data structures. If the actual size
    * of the structure exceeds these sizes, then malloc() will be allocating
    * almost twice the memory required. This is used in nfs_init() to warn
    * the sysadmin that the size of a structure should be reduced.
    * (These sizes are always a power of 2. If the kernel malloc() changes
    *  to one that does not allocate space in powers of 2 size, then this all
    *  becomes bunk!)
    */
   #define NFS_SVCALLOC    256
   #define NFS_UIDALLOC    128
   
   /*
    * Arguments to mount NFS
    */
   #define NFS_ARGSVERSION 3               /* change when nfs_args changes */
   struct nfs_args {
           int             version;        /* args structure version number */
           struct sockaddr *addr;          /* file server address */
           int             addrlen;        /* length of address */
           int             sotype;         /* Socket type */
           int             proto;          /* and Protocol */
           u_char          *fh;            /* File handle to be mounted */
           int             fhsize;         /* Size, in bytes, of fh */
           int             flags;          /* flags */
           int             wsize;          /* write size in bytes */
           int             rsize;          /* read size in bytes */
           int             readdirsize;    /* readdir size in bytes */
           int             timeo;          /* initial timeout in .1 secs */
           int             retrans;        /* times to retry send */
           int             maxgrouplist;   /* Max. size of group list */
           int             readahead;      /* # of blocks to readahead */
           int             leaseterm;      /* Term (sec) of lease */
           int             deadthresh;     /* Retrans threshold */
           char            *hostname;      /* server's name */
           int             acregmin;       /* cache attrs for reg files min time */
           int             acregmax;       /* cache attrs for reg files max time */
           int             acdirmin;       /* cache attrs for dirs min time */
           int             acdirmax;       /* cache attrs for dirs max time */
   };
   
   /*
    * NFS mount option flags
    */
   #define NFSMNT_SOFT             0x00000001  /* soft mount (hard is default) */
   #define NFSMNT_WSIZE            0x00000002  /* set write size */
   #define NFSMNT_RSIZE            0x00000004  /* set read size */
   #define NFSMNT_TIMEO            0x00000008  /* set initial timeout */
   #define NFSMNT_RETRANS          0x00000010  /* set number of request retries */
   #define NFSMNT_MAXGRPS          0x00000020  /* set maximum grouplist size */
   #define NFSMNT_INT              0x00000040  /* allow interrupts on hard mount */
   #define NFSMNT_NOCONN           0x00000080  /* Don't Connect the socket */
   #define NFSMNT_NQNFS            0x00000100  /* Use Nqnfs protocol */
   #define NFSMNT_NFSV3            0x00000200  /* Use NFS Version 3 protocol */
   #define NFSMNT_KERB             0x00000400  /* Use Kerberos authentication */
   #define NFSMNT_DUMBTIMR         0x00000800  /* Don't estimate rtt dynamically */
   #define NFSMNT_LEASETERM        0x00001000  /* set lease term (nqnfs) */
   #define NFSMNT_READAHEAD        0x00002000  /* set read ahead */
   #define NFSMNT_DEADTHRESH       0x00004000  /* set dead server retry thresh */
   #define NFSMNT_RESVPORT         0x00008000  /* Allocate a reserved port */
   #define NFSMNT_RDIRPLUS         0x00010000  /* Use Readdirplus for V3 */
   #define NFSMNT_READDIRSIZE      0x00020000  /* Set readdir size */
   #define NFSMNT_ACREGMIN         0x00040000
   #define NFSMNT_ACREGMAX         0x00080000
   #define NFSMNT_ACDIRMIN         0x00100000
   #define NFSMNT_ACDIRMAX         0x00200000
   
   #define NFSSTA_HASWRITEVERF     0x00040000  /* Has write verifier for V3 */
   #define NFSSTA_GOTPATHCONF      0x00080000  /* Got the V3 pathconf info */
   #define NFSSTA_GOTFSINFO        0x00100000  /* Got the V3 fsinfo */
   #define NFSSTA_MNTD             0x00200000  /* Mnt server for mnt point */
   #define NFSSTA_DISMINPROG       0x00400000  /* Dismount in progress */
   #define NFSSTA_DISMNT           0x00800000  /* Dismounted */
   #define NFSSTA_SNDLOCK          0x01000000  /* Send socket lock */
   #define NFSSTA_WANTSND          0x02000000  /* Want above */
   #define NFSSTA_RCVLOCK          0x04000000  /* Rcv socket lock */
   #define NFSSTA_WANTRCV          0x08000000  /* Want above */
   #define NFSSTA_WAITAUTH         0x10000000  /* Wait for authentication */
   #define NFSSTA_HASAUTH          0x20000000  /* Has authenticator */
   #define NFSSTA_WANTAUTH         0x40000000  /* Wants an authenticator */
   #define NFSSTA_AUTHERR          0x80000000  /* Authentication error */
   
   /*
    * Structures for the nfssvc(2) syscall. Not that anyone but nfsd and mount_nfs
    * should ever try and use it.
    */
   struct nfsd_args {
           int     sock;           /* Socket to serve */
           caddr_t name;           /* Client addr for connection based sockets */
           int     namelen;        /* Length of name */
   };
   
   struct nfsd_srvargs {
           struct nfsd     *nsd_nfsd;      /* Pointer to in kernel nfsd struct */
           uid_t           nsd_uid;        /* Effective uid mapped to cred */
           u_int32_t       nsd_haddr;      /* Ip address of client */
           struct ucred    nsd_cr;         /* Cred. uid maps to */
           int             nsd_authlen;    /* Length of auth string (ret) */
           u_char          *nsd_authstr;   /* Auth string (ret) */
           int             nsd_verflen;    /* and the verfier */
           u_char          *nsd_verfstr;
           struct timeval  nsd_timestamp;  /* timestamp from verifier */
           u_int32_t       nsd_ttl;        /* credential ttl (sec) */
           NFSKERBKEY_T    nsd_key;        /* Session key */
   };
   
   struct nfsd_cargs {
           char            *ncd_dirp;      /* Mount dir path */
           uid_t           ncd_authuid;    /* Effective uid */
           int             ncd_authtype;   /* Type of authenticator */
           int             ncd_authlen;    /* Length of authenticator string */
           u_char          *ncd_authstr;   /* Authenticator string */
           int             ncd_verflen;    /* and the verifier */
           u_char          *ncd_verfstr;
           NFSKERBKEY_T    ncd_key;        /* Session key */
   };
   
   /*
    * XXX to allow amd to include nfs.h without nfsproto.h
    */
   #ifdef NFS_NPROCS
   /*
    * Stats structure
    */
   struct nfsstats {
           int     attrcache_hits;
           int     attrcache_misses;
           int     lookupcache_hits;
           int     lookupcache_misses;
           int     direofcache_hits;
           int     direofcache_misses;
           int     biocache_reads;
           int     read_bios;
           int     read_physios;
           int     biocache_writes;
           int     write_bios;
           int     write_physios;
           int     biocache_readlinks;
           int     readlink_bios;
           int     biocache_readdirs;
           int     readdir_bios;
           int     rpccnt[NFS_NPROCS];
           int     rpcretries;
           int     srvrpccnt[NFS_NPROCS];
           int     srvrpc_errs;
           int     srv_errs;
           int     rpcrequests;
           int     rpctimeouts;
           int     rpcunexpected;
           int     rpcinvalid;
           int     srvcache_inproghits;
           int     srvcache_idemdonehits;
           int     srvcache_nonidemdonehits;
           int     srvcache_misses;
           int     srvnqnfs_leases;
           int     srvnqnfs_maxleases;
           int     srvnqnfs_getleases;
           int     srvvop_writes;
   };
   #endif
   
   /*
    * Flags for nfssvc() system call.
    */
   #define NFSSVC_BIOD     0x002
   #define NFSSVC_NFSD     0x004
   #define NFSSVC_ADDSOCK  0x008
   #define NFSSVC_AUTHIN   0x010
   #define NFSSVC_GOTAUTH  0x040
   #define NFSSVC_AUTHINFAIL 0x080
   #define NFSSVC_MNTD     0x100
   
   /*
    * fs.nfs sysctl(3) identifiers
    */
   #define NFS_NFSSTATS    1               /* struct: struct nfsstats */
   #define NFS_NFSPRIVPORT 2               /* int: prohibit nfs to resvports */
   
   #define FS_NFS_NAMES { \
                          { 0, 0 }, \
                          { "nfsstats", CTLTYPE_STRUCT }, \
                          { "nfsprivport", CTLTYPE_INT }, \
   }
   
   #ifdef KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_NFSREQ);
   MALLOC_DECLARE(M_NFSDIROFF);
   MALLOC_DECLARE(M_NFSRVDESC);
   MALLOC_DECLARE(M_NFSUID);
   MALLOC_DECLARE(M_NQLEASE);
   MALLOC_DECLARE(M_NFSD);
   MALLOC_DECLARE(M_NFSBIGFH);
   MALLOC_DECLARE(M_NFSHASH);
   #endif
   
   #ifdef ZONE_INTERRUPT
   extern vm_zone_t nfsmount_zone;
   #endif
   
   extern struct callout_handle nfs_timer_handle;
   
   struct uio; struct buf; struct vattr; struct nameidata; /* XXX */
   
   /*
    * The set of signals the interrupt an I/O in progress for NFSMNT_INT mounts.
    * What should be in this set is open to debate, but I believe that since
    * I/O system calls on ufs are never interrupted by signals the set should
    * be minimal. My reasoning is that many current programs that use signals
    * such as SIGALRM will not expect file I/O system calls to be interrupted
    * by them and break.
    */
   #define NFSINT_SIGMASK  (sigmask(SIGINT)|sigmask(SIGTERM)|sigmask(SIGKILL)| \
                            sigmask(SIGHUP)|sigmask(SIGQUIT))
   
   /*
    * Socket errors ignored for connectionless sockets??
    * For now, ignore them all
    */
   #define NFSIGNORE_SOERROR(s, e) \
                   ((e) != EINTR && (e) != ERESTART && (e) != EWOULDBLOCK && \
                   ((s) & PR_CONNREQUIRED) == 0)
   
   /*
    * Nfs outstanding request list element
    */
   struct nfsreq {
           TAILQ_ENTRY(nfsreq) r_chain;
           struct mbuf     *r_mreq;
           struct mbuf     *r_mrep;
           struct mbuf     *r_md;
           caddr_t         r_dpos;
           struct nfsmount *r_nmp;
           struct vnode    *r_vp;
           u_int32_t       r_xid;
           int             r_flags;        /* flags on request, see below */
           int             r_retry;        /* max retransmission count */
           int             r_rexmit;       /* current retrans count */
           int             r_timer;        /* tick counter on reply */
           u_int32_t       r_procnum;      /* NFS procedure number */
           int             r_rtt;          /* RTT for rpc */
           struct proc     *r_procp;       /* Proc that did I/O system call */
   };
   
   /*
    * Queue head for nfsreq's
    */
   extern TAILQ_HEAD(nfs_reqq, nfsreq) nfs_reqq;
   
   /* Flag values for r_flags */
   #define R_TIMING        0x01            /* timing request (in mntp) */
   #define R_SENT          0x02            /* request has been sent */
   #define R_SOFTTERM      0x04            /* soft mnt, too many retries */
   #define R_INTR          0x08            /* intr mnt, signal pending */
   #define R_SOCKERR       0x10            /* Fatal error on socket */
   #define R_TPRINTFMSG    0x20            /* Did a tprintf msg. */
   #define R_MUSTRESEND    0x40            /* Must resend request */
   #define R_GETONEREP     0x80            /* Probe for one reply only */
   
   /*
    * A list of nfssvc_sock structures is maintained with all the sockets
    * that require service by the nfsd.
    * The nfsuid structs hang off of the nfssvc_sock structs in both lru
    * and uid hash lists.
    */
   #ifndef NFS_UIDHASHSIZ
   #define NFS_UIDHASHSIZ  29      /* Tune the size of nfssvc_sock with this */
   #endif
   #define NUIDHASH(sock, uid) \
           (&(sock)->ns_uidhashtbl[(uid) % NFS_UIDHASHSIZ])
   #ifndef NFS_WDELAYHASHSIZ
   #define NFS_WDELAYHASHSIZ 16    /* and with this */
   #endif
   #define NWDELAYHASH(sock, f) \
           (&(sock)->ns_wdelayhashtbl[(*((u_int32_t *)(f))) % NFS_WDELAYHASHSIZ])
   #ifndef NFS_MUIDHASHSIZ
   #define NFS_MUIDHASHSIZ 63      /* Tune the size of nfsmount with this */
   #endif
   #define NMUIDHASH(nmp, uid) \
           (&(nmp)->nm_uidhashtbl[(uid) % NFS_MUIDHASHSIZ])
   #define NFSNOHASH(fhsum) \
           (&nfsnodehashtbl[(fhsum) & nfsnodehash])
   
   /*
    * Network address hash list element
    */
   union nethostaddr {
           u_int32_t had_inetaddr;
           struct sockaddr *had_nam;
   };
   
   struct nfsuid {
           TAILQ_ENTRY(nfsuid) nu_lru;     /* LRU chain */
           LIST_ENTRY(nfsuid) nu_hash;     /* Hash list */
           int             nu_flag;        /* Flags */
           union nethostaddr nu_haddr;     /* Host addr. for dgram sockets */
           struct ucred    nu_cr;          /* Cred uid mapped to */
           int             nu_expire;      /* Expiry time (sec) */
           struct timeval  nu_timestamp;   /* Kerb. timestamp */
           u_int32_t       nu_nickname;    /* Nickname on server */
           NFSKERBKEY_T    nu_key;         /* and session key */
   };
   
   #define nu_inetaddr     nu_haddr.had_inetaddr
   #define nu_nam          nu_haddr.had_nam
   /* Bits for nu_flag */
   #define NU_INETADDR     0x1
   #define NU_NAM          0x2
   #define NU_NETFAM(u)    (((u)->nu_flag & NU_INETADDR) ? AF_INET : AF_ISO)
   
   struct nfsrv_rec {
           STAILQ_ENTRY(nfsrv_rec) nr_link;
           struct sockaddr *nr_address;
           struct mbuf     *nr_packet;
   };
   
   struct nfssvc_sock {
           TAILQ_ENTRY(nfssvc_sock) ns_chain;      /* List of all nfssvc_sock's */
           TAILQ_HEAD(, nfsuid) ns_uidlruhead;
           struct file     *ns_fp;
           struct socket   *ns_so;
           struct sockaddr *ns_nam;
           struct mbuf     *ns_raw;
           struct mbuf     *ns_rawend;
           STAILQ_HEAD(, nfsrv_rec) ns_rec;
           struct mbuf     *ns_frag;
           int             ns_flag;
           int             ns_solock;
           int             ns_cc;
           int             ns_reclen;
           int             ns_numuids;
           u_int32_t       ns_sref;
           LIST_HEAD(, nfsrv_descript) ns_tq;      /* Write gather lists */
           LIST_HEAD(, nfsuid) ns_uidhashtbl[NFS_UIDHASHSIZ];
           LIST_HEAD(nfsrvw_delayhash, nfsrv_descript) ns_wdelayhashtbl[NFS_WDELAYHASHSIZ];
   };
   
   /* Bits for "ns_flag" */
   #define SLP_VALID       0x01
   #define SLP_DOREC       0x02
   #define SLP_NEEDQ       0x04
   #define SLP_DISCONN     0x08
   #define SLP_GETSTREAM   0x10
   #define SLP_LASTFRAG    0x20
   #define SLP_ALLFLAGS    0xff
   
   extern TAILQ_HEAD(nfssvc_sockhead, nfssvc_sock) nfssvc_sockhead;
   extern int nfssvc_sockhead_flag;
   #define SLP_INIT        0x01
   #define SLP_WANTINIT    0x02
   
   /*
    * One of these structures is allocated for each nfsd.
    */
   struct nfsd {
           TAILQ_ENTRY(nfsd) nfsd_chain;   /* List of all nfsd's */
           int             nfsd_flag;      /* NFSD_ flags */
           struct nfssvc_sock *nfsd_slp;   /* Current socket */
           int             nfsd_authlen;   /* Authenticator len */
           u_char          nfsd_authstr[RPCAUTH_MAXSIZ]; /* Authenticator data */
           int             nfsd_verflen;   /* and the Verifier */
           u_char          nfsd_verfstr[RPCVERF_MAXSIZ];
           struct proc     *nfsd_procp;    /* Proc ptr */
           struct nfsrv_descript *nfsd_nd; /* Associated nfsrv_descript */
   };
   
   /* Bits for "nfsd_flag" */
   #define NFSD_WAITING    0x01
   #define NFSD_REQINPROG  0x02
   #define NFSD_NEEDAUTH   0x04
   #define NFSD_AUTHFAIL   0x08
   
   /*
    * This structure is used by the server for describing each request.
    * Some fields are used only when write request gathering is performed.
    */
   struct nfsrv_descript {
           u_quad_t                nd_time;        /* Write deadline (usec) */
           off_t                   nd_off;         /* Start byte offset */
           off_t                   nd_eoff;        /* and end byte offset */
           LIST_ENTRY(nfsrv_descript) nd_hash;     /* Hash list */
           LIST_ENTRY(nfsrv_descript) nd_tq;               /* and timer list */
           LIST_HEAD(,nfsrv_descript) nd_coalesce; /* coalesced writes */
           struct mbuf             *nd_mrep;       /* Request mbuf list */
           struct mbuf             *nd_md;         /* Current dissect mbuf */
           struct mbuf             *nd_mreq;       /* Reply mbuf list */
           struct sockaddr         *nd_nam;        /* and socket addr */
           struct sockaddr         *nd_nam2;       /* return socket addr */
           caddr_t                 nd_dpos;        /* Current dissect pos */
           u_int32_t               nd_procnum;     /* RPC # */
           int                     nd_stable;      /* storage type */
           int                     nd_flag;        /* nd_flag */
           int                     nd_len;         /* Length of this write */
           int                     nd_repstat;     /* Reply status */
           u_int32_t               nd_retxid;      /* Reply xid */
           u_int32_t               nd_duration;    /* Lease duration */
           struct timeval          nd_starttime;   /* Time RPC initiated */
           fhandle_t               nd_fh;          /* File handle */
           struct ucred            nd_cr;          /* Credentials */
   };
   
   /* Bits for "nd_flag" */
   #define ND_READ         LEASE_READ
   #define ND_WRITE        LEASE_WRITE
   #define ND_CHECK        0x04
   #define ND_LEASE        (ND_READ | ND_WRITE | ND_CHECK)
   #define ND_NFSV3        0x08
   #define ND_NQNFS        0x10
   #define ND_KERBNICK     0x20
   #define ND_KERBFULL     0x40
   #define ND_KERBAUTH     (ND_KERBNICK | ND_KERBFULL)
   
   extern TAILQ_HEAD(nfsd_head, nfsd) nfsd_head;
   extern int nfsd_head_flag;
   #define NFSD_CHECKSLP   0x01
   
   /*
    * These macros compare nfsrv_descript structures.
    */
   #define NFSW_CONTIG(o, n) \
                   ((o)->nd_eoff >= (n)->nd_off && \
                    !bcmp((caddr_t)&(o)->nd_fh, (caddr_t)&(n)->nd_fh, NFSX_V3FH))
   
   #define NFSW_SAMECRED(o, n) \
           (((o)->nd_flag & ND_KERBAUTH) == ((n)->nd_flag & ND_KERBAUTH) && \
            !bcmp((caddr_t)&(o)->nd_cr, (caddr_t)&(n)->nd_cr, \
                   sizeof (struct ucred)))
   
   /*
    * Defines for WebNFS
    */
   
   #define WEBNFS_ESC_CHAR         '%'
   #define WEBNFS_SPECCHAR_START   0x80
   
   #define WEBNFS_NATIVE_CHAR      0x80
   /*
    * ..
    * Possibly more here in the future.
    */
   
   /*
    * Macro for converting escape characters in WebNFS pathnames.
    * Should really be in libkern.
    */
   
   #define HEXTOC(c) \
           ((c) >= 'a' ? ((c) - ('a' - 10)) : \
               ((c) >= 'A' ? ((c) - ('A' - 10)) : ((c) - '')))
   #define HEXSTRTOI(p) \
           ((HEXTOC(p[0]) << 4) + HEXTOC(p[1]))
   
   #ifdef NFS_DEBUG
   
   extern int nfs_debug;
   #define NFS_DEBUG_ASYNCIO       1 /* asynchronous i/o */
   #define NFS_DEBUG_WG            2 /* server write gathering */
   #define NFS_DEBUG_RC            4 /* server request caching */
   
   #define NFS_DPF(cat, args)                                      \
           do {                                                    \
                   if (nfs_debug & NFS_DEBUG_##cat) printf args;   \
           } while (0)
   
   #else
   
   #define NFS_DPF(cat, args)
   
   #endif
   
   u_quad_t nfs_curusec __P((void));
   int     nfs_init __P((struct vfsconf *vfsp));
   int     nfs_uninit __P((struct vfsconf *vfsp));
   int     nfs_reply __P((struct nfsreq *));
   int     nfs_getreq __P((struct nfsrv_descript *,struct nfsd *,int));
   int     nfs_send __P((struct socket *, struct sockaddr *, struct mbuf *, 
                         struct nfsreq *));
   int     nfs_rephead __P((int, struct nfsrv_descript *, struct nfssvc_sock *,
                            int, int, u_quad_t *, struct mbuf **, struct mbuf **,
                            caddr_t *));
   int     nfs_sndlock __P((int *, int *, struct nfsreq *));
   void    nfs_sndunlock __P((int *, int *));
   int     nfs_disct __P((struct mbuf **, caddr_t *, int, int, caddr_t *));
   int     nfs_vinvalbuf __P((struct vnode *, int, struct ucred *, struct proc *,
                              int));
   int     nfs_readrpc __P((struct vnode *, struct uio *, struct ucred *));
   int     nfs_writerpc __P((struct vnode *, struct uio *, struct ucred *, int *, 
                             int *));
   int     nfs_readdirrpc __P((struct vnode *, struct uio *, struct ucred *));
   int     nfs_asyncio __P((struct buf *, struct ucred *));
   int     nfs_doio __P((struct buf *, struct ucred *, struct proc *));
   int     nfs_readlinkrpc __P((struct vnode *, struct uio *, struct ucred *));
   int     nfs_sigintr __P((struct nfsmount *, struct nfsreq *, struct proc *));
   int     nfs_readdirplusrpc __P((struct vnode *, struct uio *, struct ucred *));
   int     nfsm_disct __P((struct mbuf **, caddr_t *, int, int, caddr_t *));
   void    nfsm_srvfattr __P((struct nfsrv_descript *, struct vattr *, 
                              struct nfs_fattr *));
   void    nfsm_srvwcc __P((struct nfsrv_descript *, int, struct vattr *, int,
                            struct vattr *, struct mbuf **, char **));
   void    nfsm_srvpostopattr __P((struct nfsrv_descript *, int, struct vattr *,
                                   struct mbuf **, char **));
   int     netaddr_match __P((int, union nethostaddr *, struct sockaddr *));
   int     nfs_request __P((struct vnode *, struct mbuf *, int, struct proc *,
                            struct ucred *, struct mbuf **, struct mbuf **,
                            caddr_t *));
   int     nfs_loadattrcache __P((struct vnode **, struct mbuf **, caddr_t *,
                                  struct vattr *));
   int     nfs_namei __P((struct nameidata *, fhandle_t *, int,
                          struct nfssvc_sock *, struct sockaddr *, struct mbuf **,
                          caddr_t *, struct vnode **, struct proc *, int, int));
   void    nfsm_adj __P((struct mbuf *, int, int));
   int     nfsm_mbuftouio __P((struct mbuf **, struct uio *, int, caddr_t *));
   void    nfsrv_initcache __P((void));
   int     nfs_getauth __P((struct nfsmount *, struct nfsreq *, struct ucred *, 
                            char **, int *, char *, int *, NFSKERBKEY_T));
   int     nfs_getnickauth __P((struct nfsmount *, struct ucred *, char **, 
                                int *, char *, int));
   int     nfs_savenickauth __P((struct nfsmount *, struct ucred *, int, 
                                 NFSKERBKEY_T, struct mbuf **, char **,
                                 struct mbuf *));
   int     nfs_adv __P((struct mbuf **, caddr_t *, int, int));
   void    nfs_nhinit __P((void));
   void    nfs_timer __P((void*));
   u_long  nfs_hash __P((nfsfh_t *, int));
   int     nfsrv_dorec __P((struct nfssvc_sock *, struct nfsd *, 
                            struct nfsrv_descript **));
   int     nfsrv_getcache __P((struct nfsrv_descript *, struct nfssvc_sock *,
                               struct mbuf **));
   void    nfsrv_updatecache __P((struct nfsrv_descript *, int, struct mbuf *));
   void    nfsrv_cleancache __P((void));
   int     nfs_connect __P((struct nfsmount *, struct nfsreq *));
   void    nfs_disconnect __P((struct nfsmount *));
   void    nfs_safedisconnect __P((struct nfsmount *));
   int     nfs_getattrcache __P((struct vnode *, struct vattr *));
   int     nfsm_strtmbuf __P((struct mbuf **, char **, const char *, long));
   int     nfs_bioread __P((struct vnode *, struct uio *, int, struct ucred *,
                            int));
   int     nfsm_uiotombuf __P((struct uio *, struct mbuf **, int, caddr_t *));
   void    nfsrv_init __P((int));
   void    nfs_clearcommit __P((struct mount *));
   int     nfsrv_errmap __P((struct nfsrv_descript *, int));
   void    nfsrvw_sort __P((gid_t *, int));
   void    nfsrv_setcred __P((struct ucred *, struct ucred *));
   int     nfs_writebp __P((struct buf *, int));
   int     nfsrv_object_create __P((struct vnode *));
   void    nfsrv_wakenfsd __P((struct nfssvc_sock *slp));
   int     nfsrv_writegather __P((struct nfsrv_descript **, struct nfssvc_sock *,
                                  struct proc *, struct mbuf **));
   int     nfs_fsinfo __P((struct nfsmount *, struct vnode *, struct ucred *,
                           struct proc *p));
   
   int     nfsrv3_access __P((struct nfsrv_descript *nfsd, 
                              struct nfssvc_sock *slp,
                              struct proc *procp, struct mbuf **mrq));
   int     nfsrv_commit __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_create __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_fhtovp __P((fhandle_t *, int, struct vnode **, struct ucred *,
                             struct nfssvc_sock *, struct sockaddr *, int *, 
                             int, int));
   int     nfsrv_setpublicfs __P((struct mount *, struct netexport *,
                                  struct export_args *));
   int     nfs_ispublicfh __P((fhandle_t *));
   int     nfsrv_fsinfo __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_getattr __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                              struct proc *procp, struct mbuf **mrq));
   int     nfsrv_link __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                           struct proc *procp, struct mbuf **mrq));
   int     nfsrv_lookup __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_mkdir __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                            struct proc *procp, struct mbuf **mrq));
   int     nfsrv_mknod __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                            struct proc *procp, struct mbuf **mrq));
   int     nfsrv_noop __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                           struct proc *procp, struct mbuf **mrq));
   int     nfsrv_null __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                           struct proc *procp, struct mbuf **mrq));
   int     nfsrv_pathconf __P((struct nfsrv_descript *nfsd,
                               struct nfssvc_sock *slp, struct proc *procp,
                               struct mbuf **mrq));
   int     nfsrv_read __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                           struct proc *procp, struct mbuf **mrq));
   int     nfsrv_readdir __P((struct nfsrv_descript *nfsd, 
                              struct nfssvc_sock *slp,
                              struct proc *procp, struct mbuf **mrq));
   int     nfsrv_readdirplus __P((struct nfsrv_descript *nfsd,
                                  struct nfssvc_sock *slp, struct proc *procp,
                                  struct mbuf **mrq));
   int     nfsrv_readlink __P((struct nfsrv_descript *nfsd,
                               struct nfssvc_sock *slp, struct proc *procp,
                               struct mbuf **mrq));
   int     nfsrv_remove __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_rename __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_rmdir __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                            struct proc *procp, struct mbuf **mrq));
   int     nfsrv_setattr __P((struct nfsrv_descript *nfsd, 
                              struct nfssvc_sock *slp,
                              struct proc *procp, struct mbuf **mrq));
   int     nfsrv_statfs __P((struct nfsrv_descript *nfsd, 
                             struct nfssvc_sock *slp,
                             struct proc *procp, struct mbuf **mrq));
   int     nfsrv_symlink __P((struct nfsrv_descript *nfsd, 
                              struct nfssvc_sock *slp,
                              struct proc *procp, struct mbuf **mrq));
   int     nfsrv_write __P((struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                            struct proc *procp, struct mbuf **mrq));
   void    nfsrv_rcv __P((struct socket *so, void *arg, int waitflag));
   void    nfsrv_slpderef __P((struct nfssvc_sock *slp));
   #endif  /* KERNEL */
   
   #endif

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