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

     /*      $NetBSD: nfs.h,v 1.60 2006/09/04 08:27:49 yamt Exp $    */
     /*
      * 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. 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
     */
    
    #ifndef _NFS_NFS_H_
    #define _NFS_NFS_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       (3 * NFS_HZ)    /* Default timeout = 3 seconds */
    #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_TRYLATERDEL 1               /* Initial try later delay (sec) */
    #define NFS_TRYLATERDELMAX (1*60)       /* Maximum try later delay (sec) */
    #define NFS_TRYLATERDELMUL 2            /* Exponential backoff multiplier */
    
    /*
     * These can be overridden through <machine/param.h>, included via
     * <sys/param.h>. This means that <sys/param.h> should always be
     * included before this file.
     */
    #ifndef NFS_WSIZE
    #define NFS_WSIZE       8192            /* Def. write data size */
    #endif
    #ifndef NFS_RSIZE
    #define NFS_RSIZE       8192            /* Def. read data size */
    #endif
    #ifndef NFS_READDIRSIZE
    #define NFS_READDIRSIZE 8192            /* Def. readdir size */
    #endif
    
    /*
     * NFS client IO daemon threads. May be overridden by config options.
     */
    #ifndef NFS_MAXASYNCDAEMON
    #define NFS_MAXASYNCDAEMON      128     /* Max. number async_daemons runable */
    #endif
    
    /*
     * NFS client read-ahead. May be overridden by config options.
     * Should be no more than NFS_MAXASYNCDAEMON as each read-ahead operation
     * requires one IO thread.
     */
    #ifndef NFS_MAXRAHEAD
    #define NFS_MAXRAHEAD   32              /* Max. read ahead # blocks */
    #endif
    #define NFS_DEFRAHEAD   2               /* Def. read ahead # blocks */
    
    #define NFS_MAXUIDHASH  64              /* Max. # of hashed uid entries/mp */
    
    #ifdef _KERNEL
    extern int nfs_niothreads;              /* Number of async_daemons desired */
   #ifndef NFS_DEFAULT_NIOTHREADS
   #define NFS_DEFAULT_NIOTHREADS 4
   #endif
   #endif
   #define NFS_MAXGATHERDELAY      100     /* Max. write gather delay (msec) */
   #ifndef NFS_GATHERDELAY
   #define NFS_GATHERDELAY         10      /* Default write gather delay (msec) */
   #endif
   
   /*
    * NFS_DIRBLKSIZ is the size of buffers in the buffer cache used for
    * NFS directory vnodes. NFS_DIRFRAGSIZ is the minimum aligned amount
    * of data in those buffers, and thus the minimum amount of data
    * that you can request. NFS_DIRFRAGSIZ should be no smaller than
    * DIRBLKSIZ.
    */
   
   #define NFS_DIRBLKSIZ   8192            /* Must be a multiple of DIRBLKSIZ */
   #define NFS_DIRFRAGSIZ   512            /* Same as DIRBLKSIZ, generally */
   
   /*
    * Maximum number of directory entries cached per NFS node, to avoid
    * having this grow without bounds on very large directories. The
    * minimum size to get reasonable performance for emulated binaries
    * is the maximum number of entries that fits in NFS_DIRBLKSIZ.
    * For NFS_DIRBLKSIZ = 512, this would be 512 / 14 = 36.
    */
   #define NFS_MAXDIRCACHE (NFS_DIRBLKSIZ / 14)
   
   /*
    * Oddballs
    */
   #define NFS_CMPFH(n, f, s) \
           ((n)->n_fhsize == (s) && !memcmp((caddr_t)(n)->n_fhp,  (caddr_t)(f),  (s)))
   #ifdef NFS_V2_ONLY
   #define NFS_ISV3(v)     (0)
   #else
   #define NFS_ISV3(v)     (VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV3)
   #endif
   #define NFS_SRVMAXDATA(n) \
                   (((n)->nd_flag & ND_NFSV3) ? (((n)->nd_nam2) ? \
                    NFS_MAXDGRAMDATA : NFS_MAXDATA) : NFS_V2MAXDATA)
   
   /*
    * Use the vm_page flag reserved for pager use to indicate pages
    * which have been written to the server but not yet committed.
    */
   #define PG_NEEDCOMMIT PG_PAGER1
   
   /*
    * 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(nmp, np) \
       ((nmp->nm_flag & NFSMNT_NOAC) ? 0 : \
           ((((np)->n_flag & NMODIFIED) || \
            (time_second - (np)->n_mtime.tv_sec) / 10 < NFS_MINATTRTIMO) ? NFS_MINATTRTIMO : \
            ((time_second - (np)->n_mtime.tv_sec) / 10 > NFS_MAXATTRTIMO ? NFS_MAXATTRTIMO : \
             (time_second - (np)->n_mtime.tv_sec) / 10)))
   
   /*
    * Export arguments for local filesystem mount calls.
    * Keep in mind that changing this structure modifies nfssvc(2)'s ABI (see
    * 'struct mountd_exports_list' below).
    * When modifying this structure, take care to also edit the
    * nfs_update_exports_30 function in nfs_export.c accordingly to convert
    * export_args to export_args30.
    */
   struct export_args {
           int     ex_flags;               /* export related flags */
           uid_t   ex_root;                /* mapping for root uid */
           struct  uucred ex_anon;         /* mapping for anonymous user */
           struct  sockaddr *ex_addr;      /* net address to which exported */
           int     ex_addrlen;             /* and the net address length */
           struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
           int     ex_masklen;             /* and the smask length */
           char    *ex_indexfile;          /* index file for WebNFS URLs */
   };
   
   /*
    * Structures for the nfssvc(2) syscall. Not that anyone but mountd, 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 uucred   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 */
           u_int           ncd_authlen;    /* Length of authenticator string */
           u_char          *ncd_authstr;   /* Authenticator string */
           u_int           ncd_verflen;    /* and the verifier */
           u_char          *ncd_verfstr;
           NFSKERBKEY_T    ncd_key;        /* Session key */
   };
   
   struct mountd_exports_list {
           const char              *mel_path;
           size_t                  mel_nexports;
           struct export_args      *mel_exports;
   };
   
   /*
    * 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
   #define NFSSVC_SETEXPORTSLIST   0x200
   
   /*
    * fs.nfs sysctl(3) identifiers
    */
   #define NFS_NFSSTATS    1               /* struct: struct nfsstats */
   #define NFS_IOTHREADS   2               /* number of io threads */
   #define NFS_MAXID       3
   
   #define NFS_NAMES { \
           { 0, 0 }, \
           { "nfsstats", CTLTYPE_STRUCT }, \
           { "iothreads", 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.
    */
   #ifdef _KERNEL
   
   struct uio; struct buf; struct vattr; struct nameidata; /* XXX */
   
   /*
    * 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;
           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 lwp      *r_lwp;         /* LWP that did I/O system call */
   };
   
   /*
    * Queue head for nfsreq's
    */
   extern TAILQ_HEAD(nfsreqhead, 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 */
   #define R_REXMITTED     0x100           /* retransmitted after reconnect */
   
   /*
    * 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
   #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) ((fhsum) & nfsnodehash)
   
   #ifndef NFS_DIRHASHSIZ
   #define NFS_DIRHASHSIZ 64
   #endif
   #define NFSDIRHASH(np, off) \
           (&np->n_dircache[(nfs_dirhash((off)) & nfsdirhashmask)])
   
   /*
    * Macros for storing/retrieving cookies into directory buffers.
    */
   #define NFS_STASHCOOKIE(dp,off) \
           *((off_t *)((caddr_t)(dp) + (dp)->d_reclen - sizeof (off_t))) = off
   #define NFS_GETCOOKIE(dp) \
           (*((off_t *)((caddr_t)(dp) + (dp)->d_reclen - sizeof (off_t))))
   #define NFS_STASHCOOKIE32(dp, val) \
           *((u_int32_t *)((caddr_t)(dp) + (dp)->d_reclen - sizeof (off_t) - \
               sizeof (int))) = val
   #define NFS_GETCOOKIE32(dp) \
           (*((u_int32_t *)((caddr_t)(dp) + (dp)->d_reclen - sizeof (off_t) - \
               sizeof (int))))
   
   /*
    * Flags passed to nfs_bioread().
    */
   #define NFSBIO_CACHECOOKIES     0x0001  /* Cache dir offset cookies */
   
   /*
    * Network address hash list element
    */
   union nethostaddr {
           u_int32_t 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 */
           kauth_cred_t    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
   #ifdef INET6
   #define NU_NETFAM(u) \
           (((u)->nu_flag & NU_INETADDR) ? \
           (((u)->nu_flag & NU_NAM) ? AF_INET6 : AF_INET) : AF_ISO)
   #else
   #define NU_NETFAM(u)    (((u)->nu_flag & NU_INETADDR) ? AF_INET : AF_ISO)
   #endif
   
   struct nfssvc_sock {
           struct simplelock ns_lock;
           TAILQ_ENTRY(nfssvc_sock) ns_chain;      /* List of all nfssvc_sock's */
           TAILQ_ENTRY(nfssvc_sock) ns_pending;    /* List of pending sockets */
           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_int32_t       ns_sref;
           SIMPLEQ_HEAD(, nfsrv_descript) ns_sendq; /* send reply list */
           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    /* on nfssvc_sockpending queue */
   #define SLP_NEEDQ       0x04
   #define SLP_DISCONN     0x08
   #define SLP_BUSY        0x10
   #define SLP_WANT        0x20
   #define SLP_LASTFRAG    0x40
   #define SLP_SENDING     0x80
   
   extern TAILQ_HEAD(nfssvc_sockhead, nfssvc_sock) nfssvc_sockhead;
   extern struct nfssvc_sockhead nfssvc_sockpending;
   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 */
           SLIST_ENTRY(nfsd) nfsd_idle;    /* List of idle 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_NEEDAUTH   0x04
   #define NFSD_AUTHFAIL   0x08
   
   #define NFSD_MAXFHSIZE  64
   typedef struct nfsrvfh {
           size_t nsfh_size;
           union {
                   fhandle_t u_fh;
                   uint8_t u_opaque[NFSD_MAXFHSIZE];
           } nsfh_u;
   } nfsrvfh_t;
   #define NFSRVFH_SIZE(nsfh)      ((nsfh)->nsfh_size)
   #define NFSRVFH_DATA(nsfh)      ((nsfh)->nsfh_u.u_opaque)
   #define NFSRVFH_FHANDLE(nsfh)   (&(nsfh)->nsfh_u.u_fh)
   
   /*
    * 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 */
           SIMPLEQ_ENTRY(nfsrv_descript) nd_sendq; /* send reply list */
           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 */
           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 */
           nfsrvfh_t               nd_fh;          /* File handle */
           kauth_cred_t            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 struct simplelock nfsd_slock;
   extern TAILQ_HEAD(nfsdhead, nfsd) nfsd_head;
   extern SLIST_HEAD(nfsdidlehead, nfsd) nfsd_idle_head;
   extern int nfsd_head_flag;
   #define NFSD_CHECKSLP   0x01
   
   extern struct mowner nfs_mowner;
   extern struct nfsstats nfsstats;
   extern int nfs_numasync;
   
   /*
    * These macros compare nfsrv_descript structures.
    */
   #define NFSW_CONTIG(o, n) \
                   ((o)->nd_eoff >= (n)->nd_off && \
                    !memcmp((caddr_t)&(o)->nd_fh, (caddr_t)&(n)->nd_fh, NFSX_V3FH))
   
   /*
    * 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]))
   
   /*
    * Structure holding information for a publicly exported filesystem
    * (WebNFS).  Currently the specs allow just for one such filesystem.
    */
   struct nfs_public {
           int             np_valid;       /* Do we hold valid information */
           fhandle_t       *np_handle;     /* Filehandle for pub fs (internal) */
           struct mount    *np_mount;      /* Mountpoint of exported fs */
           char            *np_index;      /* Index file */
   };
   #endif  /* _KERNEL */
   
   #endif /* _NFS_NFS_H */

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