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

     /*
      * 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. 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       8.1 (Berkeley) 6/10/93
     * $FreeBSD: src/sys/nfs/nfs.h,v 1.18.2.6 1999/09/05 08:19:37 peter Exp $
     */
    
    #ifndef _NFS_NFS_H_
    #define _NFS_NFS_H_
    
    #include <nfs/rpcv2.h>
    
    /*
     * 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 5               /* Attribute cache timeout in sec */
    #endif
    #ifndef NFS_MAXATTRTIMO
    #define NFS_MAXATTRTIMO 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 */
    
    /*
     * 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
     * sys/buf.h should be edited to change B_APPENDWRITE --> B_NEEDCOMMIT, but
     * until then...
     * Same goes for sys/malloc.h, which needs M_NFSDIROFF,
     * M_NFSRVDESC and M_NFSBIGFH added.
     * The VA_EXCLUSIVE flag should be added for va_vaflags and set for an
     * exclusive create.
     * 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".
    */
   #ifndef B_NEEDCOMMIT
   #define B_NEEDCOMMIT    B_APPENDWRITE
   #endif
   #ifndef M_NFSRVDESC
   #define M_NFSRVDESC     M_TEMP
   #endif
   #ifndef M_NFSDIROFF
   #define M_NFSDIROFF     M_TEMP
   #endif
   #ifndef M_NFSBIGFH
   #define M_NFSBIGFH      M_TEMP
   #endif
   #ifndef VA_EXCLUSIVE
   #define VA_EXCLUSIVE    0
   #endif
   #ifdef __FreeBSD__
   #define B_INVAFTERWRITE B_NOCACHE
   #else
   #define B_INVAFTERWRITE B_INVAL
   #endif
   
   /*
    * These ifdefs try to handle the differences between the various 4.4BSD-Lite
    * based vfs interfaces.
    * btw: NetBSD-current does have a VOP_LEASDE(), but I don't know how to
    * differentiate between NetBSD-1.0 and NetBSD-current, so..
    * I also don't know about BSDi's 2.0 release.
    */
   #if !defined(HAS_VOPLEASE) && !defined(__FreeBSD__) && !defined(__NetBSD__)
   #define HAS_VOPLEASE    1
   #endif
   #if !defined(HAS_VOPREVOKE) && !defined(__FreeBSD__) && !defined(__NetBSD__)
   #define HAS_VOPREVOKE   1
   #endif
   
   /*
    * 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
   
   /*
    * Set the attribute timeout based on how recently the file has been modified.
    */
   #define NFS_ATTRTIMEO(np) \
           ((((np)->n_flag & NMODIFIED) || \
            (time.tv_sec - (np)->n_mtime) / 10 < NFS_MINATTRTIMO) ? NFS_MINATTRTIMO : \
            ((time.tv_sec - (np)->n_mtime) / 10 > NFS_MAXATTRTIMO ? NFS_MAXATTRTIMO : \
             (time.tv_sec - (np)->n_mtime) / 10))
   
   /*
    * 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_NODEALLOC   256
   #define NFS_MNTALLOC    512
   #define NFS_SVCALLOC    256
   #define NFS_UIDALLOC    128
   
   /*
    * 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 address 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_long          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_long          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 */
   };
   
   /*
    * 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;
   };
   
   /*
    * 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 }, \
   }
   
   /*
    * 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.
    */
   #if defined(KERNEL) || defined(_KERNEL)
   
   struct uio; struct buf; struct vattr; struct nameidata; /* XXX */
   
   #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_long          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_long *)(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_long had_inetaddr;
           struct mbuf *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_long          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 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 mbuf     *ns_nam;
           struct mbuf     *ns_raw;
           struct mbuf     *ns_rawend;
           struct mbuf     *ns_rec;
           struct mbuf     *ns_recend;
           struct mbuf     *ns_frag;
           int             ns_flag;
           int             ns_solock;
           int             ns_cc;
           int             ns_reclen;
           int             ns_numuids;
           u_long          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 mbuf             *nd_nam;        /* and socket addr */
           struct mbuf             *nd_nam2;       /* return socket addr */
           caddr_t                 nd_dpos;        /* Current dissect pos */
           int                     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_long                  nd_retxid;      /* Reply xid */
           u_long                  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)))
   
   int     nfs_reply __P((struct nfsreq *));
   int     nfs_getreq __P((struct nfsrv_descript *,struct nfsd *,int));
   int     nfs_send __P((struct socket *,struct mbuf *,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 *,struct nfsreq *));
   void    nfs_sndunlock __P((int *flagp));
   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((register 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 *r,struct proc *));
   int     nfs_readdirplusrpc __P((struct vnode *,register 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 mbuf *));
   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 mbuf *,struct mbuf **,caddr_t *,struct vnode **,struct proc *,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));
   void    nfsrv_slpderef __P((struct nfssvc_sock *slp));
   int     nfsrv_dorec __P((struct nfssvc_sock *,struct nfsd *,struct nfsrv_descript **));
   void    nfsrv_cleancache __P((void));
   int     nfsrv_getcache __P((struct nfsrv_descript *,struct nfssvc_sock *,struct mbuf **));
   int     nfs_init __P((void));
   void    nfsrv_updatecache __P((struct nfsrv_descript *,int,struct mbuf *));
   int     nfs_connect __P((struct nfsmount *,struct nfsreq *));
   void    nfs_disconnect __P((struct nfsmount *nmp));
   int     nfs_getattrcache __P((struct vnode *,struct vattr *));
   int     nfsm_strtmbuf __P((struct mbuf **,char **,char *,long));
   int     nfs_bioread __P((struct vnode *,struct uio *,int,struct ucred *, int getpages));
   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    nfsrv_rcv __P((struct socket *so, caddr_t arg, int waitflag));
   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 mbuf *,
                           int *,int));
   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));
   
   #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
   
   #endif  /* KERNEL */
   
   #endif

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