FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_serv.c

     /*
      * 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_serv.c  8.8 (Berkeley) 7/31/95
     * $FreeBSD$
     */
    
    /*
     * nfs version 2 and 3 server calls to vnode ops
     * - these routines generally have 3 phases
     *   1 - break down and validate rpc request in mbuf list
     *   2 - do the vnode ops for the request
     *       (surprisingly ?? many are very similar to syscalls in vfs_syscalls.c)
     *   3 - build the rpc reply in an mbuf list
     *   nb:
     *      - do not mix the phases, since the nfsm_?? macros can return failures
     *        on a bad rpc or similar and do not do any vrele() or vput()'s
     *
     *      - the nfsm_reply() macro generates an nfs rpc reply with the nfs
     *      error number iff error != 0 whereas
     *      returning an error from the server function implies a fatal error
     *      such as a badly constructed rpc request that should be dropped without
     *      a reply.
     *      For Version 3, nfsm_reply() does not return for the error case, since
     *      most version 3 rpcs return more than the status for error cases.
     *
     * Other notes:
     *      Warning: always pay careful attention to resource cleanup on return
     *      and note that nfsm_*() macros can terminate a procedure on certain
     *      errors.
     *
     *      VOP_ABORTOP() only frees the path component if HASBUF is set and
     *      SAVESTART is *not* set.
     *
     *      Various VOP_*() routines tend to free the path component if an 
     *      error occurs.  If no error occurs, the VOP_*() routines only free
     *      the path component if SAVESTART is NOT set.
     *
     *      Certain VOP calls (VOP_SYMLINK, VOP_MKNOD), lookup(), and namei()
     *      may return garbage in various structural fields/return elements
     *      if an error is returned, and may garbage up nd.ni_dvp even if no
     *      error is returned and you did not request LOCKPARENT or WANTPARENT.
     *      VOP_SYMLINK/VOP_MKNOD return garbage in their return vnode (i.e. not
     *      something we need to release) even if no error occurs.  Our cleanup
     *      code is sensitive to garbage, so we have to carefully clear it out.
     *
     *      We use the ni_cnd.cn_flags 'HASBUF' flag to track whether the name
     *      buffer has been freed or not.  This is unique to nfs_serv.c for
     *      the moment, the rest of the system sets HASBUF but never clears it.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/namei.h>
    #include <sys/unistd.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/dirent.h>
    #include <sys/stat.h>
    #include <sys/kernel.h>
    #include <sys/sysctl.h>
    
   #include <vm/vm.h>
   #include <vm/vm_extern.h>
   #include <vm/vm_zone.h>
   #include <vm/vm_object.h>
   
   #include <nfs/nfsproto.h>
   #include <nfs/rpcv2.h>
   #include <nfs/nfs.h>
   #include <nfs/xdr_subs.h>
   #include <nfs/nfsm_subs.h>
   #include <nfs/nqnfs.h>
   
   #ifdef NFSRV_DEBUG
   #define nfsdbprintf(info)       printf info
   #else
   #define nfsdbprintf(info)
   #endif
   
   nfstype nfsv3_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK,
                         NFFIFO, NFNON };
   #ifndef NFS_NOSERVER 
   nfstype nfsv2_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFNON,
                         NFCHR, NFNON };
   /* Global vars */
   extern u_int32_t nfs_xdrneg1;
   extern u_int32_t nfs_false, nfs_true;
   extern enum vtype nv3tov_type[8];
   extern struct nfsstats nfsstats;
   
   int nfsrvw_procrastinate = NFS_GATHERDELAY * 1000;
   int nfsrvw_procrastinate_v3 = 0;
   
   static struct timeval nfsver = { 0 };
   static int nfs_async;
   
   SYSCTL_INT(_vfs_nfs, OID_AUTO, async, CTLFLAG_RW, &nfs_async, 0, "");
   
   static int nfsrv_access __P((struct vnode *,int,struct ucred *,int,
                   struct proc *, int));
   static void nfsrvw_coalesce __P((struct nfsrv_descript *,
                   struct nfsrv_descript *));
   
   /*
    * Clear nameidata fields that are tested in nsfmout cleanup code prior
    * to using first nfsm macro (that might jump to the cleanup code).
    */
   
   static __inline 
   void
   ndclear(struct nameidata *nd)
   {
           nd->ni_cnd.cn_flags = 0;
           nd->ni_vp = NULL;
           nd->ni_dvp = NULL;
           nd->ni_startdir = NULL;
   }
   
   /*
    * nfs v3 access service
    */
   int
   nfsrv3_access(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           struct vnode *vp = NULL;
           nfsfh_t nfh;
           fhandle_t *fhp;
           register u_int32_t *tl;
           register int32_t t1;
           caddr_t bpos;
           int error = 0, rdonly, cache, getret;
           char *cp2;
           struct mbuf *mb, *mreq, *mb2;
           struct vattr vattr, *vap = &vattr;
           u_long testmode, nfsmode;
           u_quad_t frev;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
   #ifndef nolint
           cache = 0;
   #endif
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
           error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly,
               (nfsd->nd_flag & ND_KERBAUTH), TRUE);
           if (error) {
                   nfsm_reply(NFSX_UNSIGNED);
                   nfsm_srvpostop_attr(1, (struct vattr *)0);
                   error = 0;
                   goto nfsmout;
           }
           nfsmode = fxdr_unsigned(u_int32_t, *tl);
           if ((nfsmode & NFSV3ACCESS_READ) &&
                   nfsrv_access(vp, VREAD, cred, rdonly, procp, 0))
                   nfsmode &= ~NFSV3ACCESS_READ;
           if (vp->v_type == VDIR)
                   testmode = (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
                           NFSV3ACCESS_DELETE);
           else
                   testmode = (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
           if ((nfsmode & testmode) &&
                   nfsrv_access(vp, VWRITE, cred, rdonly, procp, 0))
                   nfsmode &= ~testmode;
           if (vp->v_type == VDIR)
                   testmode = NFSV3ACCESS_LOOKUP;
           else
                   testmode = NFSV3ACCESS_EXECUTE;
           if ((nfsmode & testmode) &&
                   nfsrv_access(vp, VEXEC, cred, rdonly, procp, 0))
                   nfsmode &= ~testmode;
           getret = VOP_GETATTR(vp, vap, cred, procp);
           vput(vp);
           vp = NULL;
           nfsm_reply(NFSX_POSTOPATTR(1) + NFSX_UNSIGNED);
           nfsm_srvpostop_attr(getret, vap);
           nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
           *tl = txdr_unsigned(nfsmode);
   nfsmout:
           if (vp)
                   vput(vp);
           return(error);
   }
   
   /*
    * nfs getattr service
    */
   int
   nfsrv_getattr(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           register struct nfs_fattr *fp;
           struct vattr va;
           register struct vattr *vap = &va;
           struct vnode *vp = NULL;
           nfsfh_t nfh;
           fhandle_t *fhp;
           register u_int32_t *tl;
           register int32_t t1;
           caddr_t bpos;
           int error = 0, rdonly, cache;
           char *cp2;
           struct mbuf *mb, *mb2, *mreq;
           u_quad_t frev;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                    &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
           if (error) {
                   nfsm_reply(0);
                   error = 0;
                   goto nfsmout;
           }
           nqsrv_getl(vp, ND_READ);
           error = VOP_GETATTR(vp, vap, cred, procp);
           vput(vp);
           vp = NULL;
           nfsm_reply(NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
           if (error) {
                   error = 0;
                   goto nfsmout;
           }
           nfsm_build(fp, struct nfs_fattr *, NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
           nfsm_srvfillattr(vap, fp);
           /* fall through */
   
   nfsmout:
           if (vp)
                   vput(vp);
           return(error);
   }
   
   /*
    * nfs setattr service
    */
   int
   nfsrv_setattr(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           struct vattr va, preat;
           register struct vattr *vap = &va;
           register struct nfsv2_sattr *sp;
           register struct nfs_fattr *fp;
           struct vnode *vp = NULL;
           nfsfh_t nfh;
           fhandle_t *fhp;
           register u_int32_t *tl;
           register int32_t t1;
           caddr_t bpos;
           int error = 0, rdonly, cache, preat_ret = 1, postat_ret = 1;
           int v3 = (nfsd->nd_flag & ND_NFSV3), gcheck = 0;
           char *cp2;
           struct mbuf *mb, *mb2, *mreq;
           u_quad_t frev;
           struct timespec guard;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           VATTR_NULL(vap);
           if (v3) {
                   nfsm_srvsattr(vap);
                   nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
                   gcheck = fxdr_unsigned(int, *tl);
                   if (gcheck) {
                           nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                           fxdr_nfsv3time(tl, &guard);
                   }
           } else {
                   nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
                   /*
                    * Nah nah nah nah na nah
                    * There is a bug in the Sun client that puts 0xffff in the mode
                    * field of sattr when it should put in 0xffffffff. The u_short
                    * doesn't sign extend.
                    * --> check the low order 2 bytes for 0xffff
                    */
                   if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
                           vap->va_mode = nfstov_mode(sp->sa_mode);
                   if (sp->sa_uid != nfs_xdrneg1)
                           vap->va_uid = fxdr_unsigned(uid_t, sp->sa_uid);
                   if (sp->sa_gid != nfs_xdrneg1)
                           vap->va_gid = fxdr_unsigned(gid_t, sp->sa_gid);
                   if (sp->sa_size != nfs_xdrneg1)
                           vap->va_size = fxdr_unsigned(u_quad_t, sp->sa_size);
                   if (sp->sa_atime.nfsv2_sec != nfs_xdrneg1) {
   #ifdef notyet
                           fxdr_nfsv2time(&sp->sa_atime, &vap->va_atime);
   #else
                           vap->va_atime.tv_sec =
                                   fxdr_unsigned(int32_t, sp->sa_atime.nfsv2_sec);
                           vap->va_atime.tv_nsec = 0;
   #endif
                   }
                   if (sp->sa_mtime.nfsv2_sec != nfs_xdrneg1)
                           fxdr_nfsv2time(&sp->sa_mtime, &vap->va_mtime);
   
           }
   
           /*
            * Now that we have all the fields, lets do it.
            */
           error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly,
                   (nfsd->nd_flag & ND_KERBAUTH), TRUE);
           if (error) {
                   nfsm_reply(2 * NFSX_UNSIGNED);
                   nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap);
                   error = 0;
                   goto nfsmout;
           }
   
           /*
            * vp now an active resource, pay careful attention to cleanup
            */
   
           nqsrv_getl(vp, ND_WRITE);
           if (v3) {
                   error = preat_ret = VOP_GETATTR(vp, &preat, cred, procp);
                   if (!error && gcheck &&
                           (preat.va_ctime.tv_sec != guard.tv_sec ||
                            preat.va_ctime.tv_nsec != guard.tv_nsec))
                           error = NFSERR_NOT_SYNC;
                   if (error) {
                           vput(vp);
                           vp = NULL;
                           nfsm_reply(NFSX_WCCDATA(v3));
                           nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap);
                           error = 0;
                           goto nfsmout;
                   }
           }
   
           /*
            * If the size is being changed write acces is required, otherwise
            * just check for a read only file system.
            */
           if (vap->va_size == ((u_quad_t)((quad_t) -1))) {
                   if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) {
                           error = EROFS;
                           goto out;
                   }
           } else {
                   if (vp->v_type == VDIR) {
                           error = EISDIR;
                           goto out;
                   } else if ((error = nfsrv_access(vp, VWRITE, cred, rdonly,
                           procp, 0)) != 0)
                           goto out;
           }
           error = VOP_SETATTR(vp, vap, cred, procp);
           postat_ret = VOP_GETATTR(vp, vap, cred, procp);
           if (!error)
                   error = postat_ret;
   out:
           vput(vp);
           vp = NULL;
           nfsm_reply(NFSX_WCCORFATTR(v3));
           if (v3) {
                   nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap);
                   error = 0;
                   goto nfsmout;
           } else {
                   nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
                   nfsm_srvfillattr(vap, fp);
           }
           /* fall through */
   
   nfsmout:
           if (vp)
                   vput(vp);
           return(error);
   }
   
   /*
    * nfs lookup rpc
    */
   int
   nfsrv_lookup(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           register struct nfs_fattr *fp;
           struct nameidata nd, ind, *ndp = &nd;
           struct vnode *vp, *dirp = NULL;
           nfsfh_t nfh;
           fhandle_t *fhp;
           register caddr_t cp;
           register u_int32_t *tl;
           register int32_t t1;
           caddr_t bpos;
           int error = 0, cache, len, dirattr_ret = 1;
           int v3 = (nfsd->nd_flag & ND_NFSV3), pubflag;
           char *cp2;
           struct mbuf *mb, *mb2, *mreq;
           struct vattr va, dirattr, *vap = &va;
           u_quad_t frev;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
           ndclear(&nd);
   
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           nfsm_srvnamesiz(len);
   
           pubflag = nfs_ispublicfh(fhp);
   
           nd.ni_cnd.cn_cred = cred;
           nd.ni_cnd.cn_nameiop = LOOKUP;
           nd.ni_cnd.cn_flags = LOCKLEAF | SAVESTART;
           error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                   &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), pubflag);
   
           /*
            * namei failure, only dirp to cleanup.  Clear out garbarge from
            * structure in case macros jump to nfsmout.
            */
   
           if (error) {
                   if (dirp) {
                           if (v3)
                                   dirattr_ret = VOP_GETATTR(dirp, &dirattr, cred,
                                           procp);
                           vrele(dirp);
                           dirp = NULL;
                   }
                   nfsm_reply(NFSX_POSTOPATTR(v3));
                   nfsm_srvpostop_attr(dirattr_ret, &dirattr);
                   error = 0;
                   goto nfsmout;
           }
   
           /*
            * Locate index file for public filehandle
            *
            * error is 0 on entry and 0 on exit from this block.
            */
   
           if (pubflag) {
                   if (nd.ni_vp->v_type == VDIR && nfs_pub.np_index != NULL) {
                           /*
                            * Setup call to lookup() to see if we can find
                            * the index file. Arguably, this doesn't belong
                            * in a kernel.. Ugh.  If an error occurs, do not
                            * try to install an index file and then clear the
                            * error.
                            *
                            * When we replace nd with ind and redirect ndp,
                            * maintenance of ni_startdir and ni_vp shift to
                            * ind and we have to clean them up in the old nd.
                            * However, the cnd resource continues to be maintained
                            * via the original nd.  Confused?  You aren't alone!
                            */
                           ind = nd;
                           VOP_UNLOCK(nd.ni_vp, 0, procp);
                           ind.ni_pathlen = strlen(nfs_pub.np_index);
                           ind.ni_cnd.cn_nameptr = ind.ni_cnd.cn_pnbuf =
                               nfs_pub.np_index;
                           ind.ni_startdir = nd.ni_vp;
                           VREF(ind.ni_startdir);
   
                           error = lookup(&ind);
                           ind.ni_dvp = NULL;
   
                           if (error == 0) {
                                   /*
                                    * Found an index file. Get rid of
                                    * the old references.  transfer nd.ni_vp'
                                    */
                                   if (dirp)       
                                           vrele(dirp);
                                   dirp = nd.ni_vp;
                                   nd.ni_vp = NULL;
                                   vrele(nd.ni_startdir);
                                   nd.ni_startdir = NULL;
                                   ndp = &ind;
                           }
                           error = 0;
                   }
                   /*
                    * If the public filehandle was used, check that this lookup
                    * didn't result in a filehandle outside the publicly exported
                    * filesystem.  We clear the poor vp here to avoid lockups due
                    * to NFS I/O.
                    */
   
                   if (ndp->ni_vp->v_mount != nfs_pub.np_mount) {
                           vput(nd.ni_vp);
                           nd.ni_vp = NULL;
                           error = EPERM;
                   }
           }
   
           if (dirp) {
                   if (v3)
                           dirattr_ret = VOP_GETATTR(dirp, &dirattr, cred,
                                   procp);
                   vrele(dirp);
                   dirp = NULL;
           }
   
           /*
            * Resources at this point:
            *      ndp->ni_vp      may not be NULL
            *
            */
   
           if (error) {
                   nfsm_reply(NFSX_POSTOPATTR(v3));
                   nfsm_srvpostop_attr(dirattr_ret, &dirattr);
                   error = 0;
                   goto nfsmout;
           }
   
           nqsrv_getl(ndp->ni_startdir, ND_READ);
   
           /*
            * Clear out some resources prior to potentially blocking.  This
            * is not as critical as ni_dvp resources in other routines, but
            * it helps.
            */
           vrele(ndp->ni_startdir);
           ndp->ni_startdir = NULL;
           zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
           nd.ni_cnd.cn_flags &= ~HASBUF;
   
           /*
            * Get underlying attribute, then release remaining resources ( for
            * the same potential blocking reason ) and reply.
            */
           vp = ndp->ni_vp;
           bzero((caddr_t)fhp, sizeof(nfh));
           fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
           error = VFS_VPTOFH(vp, &fhp->fh_fid);
           if (!error)
                   error = VOP_GETATTR(vp, vap, cred, procp);
   
           vput(vp);
           ndp->ni_vp = NULL;
           nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPORFATTR(v3) + NFSX_POSTOPATTR(v3));
           if (error) {
                   nfsm_srvpostop_attr(dirattr_ret, &dirattr);
                   error = 0;
                   goto nfsmout;
           }
           nfsm_srvfhtom(fhp, v3);
           if (v3) {
                   nfsm_srvpostop_attr(0, vap);
                   nfsm_srvpostop_attr(dirattr_ret, &dirattr);
           } else {
                   nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
                   nfsm_srvfillattr(vap, fp);
           }
   
   nfsmout:
           if (dirp)
                   vrele(dirp);
           if (nd.ni_cnd.cn_flags & HASBUF)
                   zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
           if (ndp->ni_startdir)
                   vrele(ndp->ni_startdir);
           if (ndp->ni_vp)
                   vput(ndp->ni_vp);
           return (error);
   }
   
   /*
    * nfs readlink service
    */
   int
   nfsrv_readlink(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
           register struct iovec *ivp = iv;
           register struct mbuf *mp;
           register u_int32_t *tl;
           register int32_t t1;
           caddr_t bpos;
           int error = 0, rdonly, cache, i, tlen, len, getret;
           int v3 = (nfsd->nd_flag & ND_NFSV3);
           char *cp2;
           struct mbuf *mb, *mb2, *mp2, *mp3, *mreq;
           struct vnode *vp = NULL;
           struct vattr attr;
           nfsfh_t nfh;
           fhandle_t *fhp;
           struct uio io, *uiop = &io;
           u_quad_t frev;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
   #ifndef nolint
           mp2 = (struct mbuf *)0;
   #endif
           mp3 = NULL;
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           len = 0;
           i = 0;
           while (len < NFS_MAXPATHLEN) {
                   MGET(mp, M_WAIT, MT_DATA);
                   MCLGET(mp, M_WAIT);
                   mp->m_len = NFSMSIZ(mp);
                   if (len == 0)
                           mp3 = mp2 = mp;
                   else {
                           mp2->m_next = mp;
                           mp2 = mp;
                   }
                   if ((len+mp->m_len) > NFS_MAXPATHLEN) {
                           mp->m_len = NFS_MAXPATHLEN-len;
                           len = NFS_MAXPATHLEN;
                   } else
                           len += mp->m_len;
                   ivp->iov_base = mtod(mp, caddr_t);
                   ivp->iov_len = mp->m_len;
                   i++;
                   ivp++;
           }
           uiop->uio_iov = iv;
           uiop->uio_iovcnt = i;
           uiop->uio_offset = 0;
           uiop->uio_resid = len;
           uiop->uio_rw = UIO_READ;
           uiop->uio_segflg = UIO_SYSSPACE;
           uiop->uio_procp = (struct proc *)0;
           error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                    &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
           if (error) {
                   nfsm_reply(2 * NFSX_UNSIGNED);
                   nfsm_srvpostop_attr(1, (struct vattr *)0);
                   error = 0;
                   goto nfsmout;
           }
           if (vp->v_type != VLNK) {
                   if (v3)
                           error = EINVAL;
                   else
                           error = ENXIO;
                   goto out;
           }
           nqsrv_getl(vp, ND_READ);
           error = VOP_READLINK(vp, uiop, cred);
   out:
           getret = VOP_GETATTR(vp, &attr, cred, procp);
           vput(vp);
           vp = NULL;
           nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_UNSIGNED);
           if (v3) {
                   nfsm_srvpostop_attr(getret, &attr);
                   if (error) {
                           error = 0;
                           goto nfsmout;
                   }
           }
           if (uiop->uio_resid > 0) {
                   len -= uiop->uio_resid;
                   tlen = nfsm_rndup(len);
                   nfsm_adj(mp3, NFS_MAXPATHLEN-tlen, tlen-len);
           }
           nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
           *tl = txdr_unsigned(len);
           mb->m_next = mp3;
           mp3 = NULL;
   nfsmout:
           if (mp3)
                   m_freem(mp3);
           if (vp)
                   vput(vp);
           return(error);
   }
   
   /*
    * nfs read service
    */
   int
   nfsrv_read(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           register struct iovec *iv;
           struct iovec *iv2;
           register struct mbuf *m;
           register struct nfs_fattr *fp;
           register u_int32_t *tl;
           register int32_t t1;
           register int i;
           caddr_t bpos;
           int error = 0, rdonly, cache, cnt, len, left, siz, tlen, getret;
           int v3 = (nfsd->nd_flag & ND_NFSV3), reqlen;
           char *cp2;
           struct mbuf *mb, *mb2, *mreq;
           struct mbuf *m2;
           struct vnode *vp = NULL;
           nfsfh_t nfh;
           fhandle_t *fhp;
           struct uio io, *uiop = &io;
           struct vattr va, *vap = &va;
           off_t off;
           u_quad_t frev;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           if (v3) {
                   nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                   fxdr_hyper(tl, &off);
           } else {
                   nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
                   off = (off_t)fxdr_unsigned(u_int32_t, *tl);
           }
           nfsm_srvstrsiz(reqlen, NFS_SRVMAXDATA(nfsd));
   
           /*
            * Reference vp.  If an error occurs, vp will be invalid, but we
            * have to NULL it just in case.  The macros might goto nfsmout
            * as well.
            */
   
           error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                    &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
           if (error) {
                   vp = NULL;
                   nfsm_reply(2 * NFSX_UNSIGNED);
                   nfsm_srvpostop_attr(1, (struct vattr *)0);
                   error = 0;
                   goto nfsmout;
           }
   
           if (vp->v_type != VREG) {
                   if (v3)
                           error = EINVAL;
                   else
                           error = (vp->v_type == VDIR) ? EISDIR : EACCES;
           }
           if (!error) {
               nqsrv_getl(vp, ND_READ);
               if ((error = nfsrv_access(vp, VREAD, cred, rdonly, procp, 1)) != 0)
                   error = nfsrv_access(vp, VEXEC, cred, rdonly, procp, 1);
           }
           getret = VOP_GETATTR(vp, vap, cred, procp);
           if (!error)
                   error = getret;
           if (error) {
                   vput(vp);
                   vp = NULL;
                   nfsm_reply(NFSX_POSTOPATTR(v3));
                   nfsm_srvpostop_attr(getret, vap);
                   error = 0;
                   goto nfsmout;
           }
           if (off >= vap->va_size)
                   cnt = 0;
           else if ((off + reqlen) > vap->va_size)
                   cnt = vap->va_size - off;
           else
                   cnt = reqlen;
           nfsm_reply(NFSX_POSTOPORFATTR(v3) + 3 * NFSX_UNSIGNED+nfsm_rndup(cnt));
           if (v3) {
                   nfsm_build(tl, u_int32_t *, NFSX_V3FATTR + 4 * NFSX_UNSIGNED);
                   *tl++ = nfs_true;
                   fp = (struct nfs_fattr *)tl;
                   tl += (NFSX_V3FATTR / sizeof (u_int32_t));
           } else {
                   nfsm_build(tl, u_int32_t *, NFSX_V2FATTR + NFSX_UNSIGNED);
                   fp = (struct nfs_fattr *)tl;
                   tl += (NFSX_V2FATTR / sizeof (u_int32_t));
           }
           len = left = nfsm_rndup(cnt);
           if (cnt > 0) {
                   /*
                    * Generate the mbuf list with the uio_iov ref. to it.
                    */
                   i = 0;
                   m = m2 = mb;
                   while (left > 0) {
                           siz = min(M_TRAILINGSPACE(m), left);
                           if (siz > 0) {
                                   left -= siz;
                                   i++;
                           }
                           if (left > 0) {
                                   MGET(m, M_WAIT, MT_DATA);
                                   MCLGET(m, M_WAIT);
                                   m->m_len = 0;
                                   m2->m_next = m;
                                   m2 = m;
                           }
                   }
                   MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
                          M_TEMP, M_WAITOK);
                   uiop->uio_iov = iv2 = iv;
                   m = mb;
                   left = len;
                   i = 0;
                   while (left > 0) {
                           if (m == NULL)
                                   panic("nfsrv_read iov");
                           siz = min(M_TRAILINGSPACE(m), left);
                           if (siz > 0) {
                                   iv->iov_base = mtod(m, caddr_t) + m->m_len;
                                   iv->iov_len = siz;
                                   m->m_len += siz;
                                   left -= siz;
                                   iv++;
                                   i++;
                           }
                           m = m->m_next;
                   }
                   uiop->uio_iovcnt = i;
                   uiop->uio_offset = off;
                   uiop->uio_resid = len;
                   uiop->uio_rw = UIO_READ;
                   uiop->uio_segflg = UIO_SYSSPACE;
                   error = VOP_READ(vp, uiop, IO_NODELOCKED, cred);
                   off = uiop->uio_offset;
                   FREE((caddr_t)iv2, M_TEMP);
                   if (error || (getret = VOP_GETATTR(vp, vap, cred, procp))) {
                           if (!error)
                                   error = getret;
                           m_freem(mreq);
                           vput(vp);
                           vp = NULL;
                           nfsm_reply(NFSX_POSTOPATTR(v3));
                           nfsm_srvpostop_attr(getret, vap);
                           error = 0;
                           goto nfsmout;
                   }
           } else {
                   uiop->uio_resid = 0;
           }
           vput(vp);
           vp = NULL;
           nfsm_srvfillattr(vap, fp);
           tlen = len - uiop->uio_resid;
           cnt = cnt < tlen ? cnt : tlen;
           tlen = nfsm_rndup(cnt);
           if (len != tlen || tlen != cnt)
                   nfsm_adj(mb, len - tlen, tlen - cnt);
           if (v3) {
                   *tl++ = txdr_unsigned(cnt);
                   if (len < reqlen)
                           *tl++ = nfs_true;
                   else
                           *tl++ = nfs_false;
           }
           *tl = txdr_unsigned(cnt);
   nfsmout:
           if (vp)
                   vput(vp);
           return(error);
   }
   
   /*
    * nfs write service
    */
   int
   nfsrv_write(nfsd, slp, procp, mrq)
           struct nfsrv_descript *nfsd;
           struct nfssvc_sock *slp;
           struct proc *procp;
           struct mbuf **mrq;
   {
           struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
           struct sockaddr *nam = nfsd->nd_nam;
           caddr_t dpos = nfsd->nd_dpos;
           struct ucred *cred = &nfsd->nd_cr;
           register struct iovec *ivp;
           register int i, cnt;
           register struct mbuf *mp;
           register struct nfs_fattr *fp;
           struct iovec *iv;
           struct vattr va, forat;
           register struct vattr *vap = &va;
           register u_int32_t *tl;
           register int32_t t1;
           caddr_t bpos;
           int error = 0, rdonly, cache, len, forat_ret = 1;
           int ioflags, aftat_ret = 1, retlen, zeroing, adjust;
           int stable = NFSV3WRITE_FILESYNC;
           int v3 = (nfsd->nd_flag & ND_NFSV3);
           char *cp2;
           struct mbuf *mb, *mb2, *mreq;
           struct vnode *vp = NULL;
           nfsfh_t nfh;
           fhandle_t *fhp;
           struct uio io, *uiop = &io;
           off_t off;
           u_quad_t frev;
   
           nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
           if (mrep == NULL) {
                   *mrq = NULL;
                   error = 0;
                   goto nfsmout;
           }
           fhp = &nfh.fh_generic;
           nfsm_srvmtofh(fhp);
           if (v3) {
                   nfsm_dissect(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
                   fxdr_hyper(tl, &off);
                   tl += 3;
                   stable = fxdr_unsigned(int, *tl++);
           } else {
                   nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                   off = (off_t)fxdr_unsigned(u_int32_t, *++tl);
                   tl += 2;
                   if (nfs_async)
                           stable = NFSV3WRITE_UNSTABLE;
           }
           retlen = len = fxdr_unsigned(int32_t, *tl);
           cnt = i = 0;
   
           /*
            * For NFS Version 2, it is not obvious what a write of zero length
            * should do, but I might as well be consistent with Version 3,
            * which is to return ok so long as there are no permission problems.
            */
           if (len > 0) {
              zeroing = 1;
              mp = mrep;
              while (mp) {
                  if (mp == md) {
                          zeroing = 0;
                          adjust = dpos - mtod(mp, caddr_t);
                          mp->m_len -= adjust;
                          if (mp->m_len > 0 && adjust > 0)
                                  NFSMADV(mp, adjust);
                  }
                  if (zeroing)
                          mp->m_len = 0;
                  else if (mp->m_len > 0) {
                          i += mp->m_len;
                          if (i > len) {
                                  mp->m_len -= (i - len);
                                  zeroing = 1;
                          }
                          if (mp->m_len > 0)
                                  cnt++;
                  }
                  mp = mp->m_next;
              }
          }
          if (len > NFS_MAXDATA || len < 0 || i < len) {
                  error = EIO;
                  nfsm_reply(2 * NFSX_UNSIGNED);
                  nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
                  error = 0;
                  goto nfsmout;
          }
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (error) {
                  vp = NULL;
                  nfsm_reply(2 * NFSX_UNSIGNED);
                  nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
                  error = 0;
                  goto nfsmout;
          }
          if (v3)
                  forat_ret = VOP_GETATTR(vp, &forat, cred, procp);
          if (vp->v_type != VREG) {
                  if (v3)
                          error = EINVAL;
                  else
                          error = (vp->v_type == VDIR) ? EISDIR : EACCES;
          }
          if (!error) {
                  nqsrv_getl(vp, ND_WRITE);
                  error = nfsrv_access(vp, VWRITE, cred, rdonly, procp, 1);
          }
          if (error) {
                  vput(vp);
                  vp = NULL;
                  nfsm_reply(NFSX_WCCDATA(v3));
                  nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
                  error = 0;
                  goto nfsmout;
          }
  
          if (len > 0) {
              MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
                  M_WAITOK);
              uiop->uio_iov = iv = ivp;
              uiop->uio_iovcnt = cnt;
              mp = mrep;
              while (mp) {
                  if (mp->m_len > 0) {
                          ivp->iov_base = mtod(mp, caddr_t);
                          ivp->iov_len = mp->m_len;
                          ivp++;
                  }
                  mp = mp->m_next;
              }
  
              /*
               * XXX
               * The IO_METASYNC flag indicates that all metadata (and not just
               * enough to ensure data integrity) mus be written to stable storage
               * synchronously.
               * (IO_METASYNC is not yet implemented in 4.4BSD-Lite.)
               */
              if (stable == NFSV3WRITE_UNSTABLE)
                  ioflags = IO_NODELOCKED;
              else if (stable == NFSV3WRITE_DATASYNC)
                  ioflags = (IO_SYNC | IO_NODELOCKED);
              else
                  ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED);
              uiop->uio_resid = len;
              uiop->uio_rw = UIO_WRITE;
              uiop->uio_segflg = UIO_SYSSPACE;
              uiop->uio_procp = (struct proc *)0;
              uiop->uio_offset = off;
              error = VOP_WRITE(vp, uiop, ioflags, cred);
              nfsstats.srvvop_writes++;
              FREE((caddr_t)iv, M_TEMP);
          }
          aftat_ret = VOP_GETATTR(vp, vap, cred, procp);
          vput(vp);
          vp = NULL;
          if (!error)
                  error = aftat_ret;
          nfsm_reply(NFSX_PREOPATTR(v3) + NFSX_POSTOPORFATTR(v3) +
                  2 * NFSX_UNSIGNED + NFSX_WRITEVERF(v3));
          if (v3) {
                  nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
                  if (error) {
                          error = 0;
                          goto nfsmout;
                  }
                  nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                  *tl++ = txdr_unsigned(retlen);
                  /*
                   * If nfs_async is set, then pretend the write was FILESYNC.
                   */
                  if (stable == NFSV3WRITE_UNSTABLE && !nfs_async)
                          *tl++ = txdr_unsigned(stable);
                  else
                          *tl++ = txdr_unsigned(NFSV3WRITE_FILESYNC);
                  /*
                   * Actually, there is no need to txdr these fields,
                   * but it may make the values more human readable,
                   * for debugging purposes.
                   */
                  if (nfsver.tv_sec == 0)
                          nfsver = boottime;
                  *tl++ = txdr_unsigned(nfsver.tv_sec);
                  *tl = txdr_unsigned(nfsver.tv_usec);
          } else {
                  nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
                  nfsm_srvfillattr(vap, fp);
          }
  nfsmout:
          if (vp)
                  vput(vp);
          return(error);
  }
  
  /*
   * NFS write service with write gathering support. Called when
   * nfsrvw_procrastinate > 0.
   * See: Chet Juszczak, "Improving the Write Performance of an NFS Server",
   * in Proc. of the Winter 1994 Usenix Conference, pg. 247-259, San Franscisco,
   * Jan. 1994.
   */
  int
  nfsrv_writegather(ndp, slp, procp, mrq)
          struct nfsrv_descript **ndp;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          register struct iovec *ivp;
          register struct mbuf *mp;
          register struct nfsrv_descript *wp, *nfsd, *owp, *swp;
          register struct nfs_fattr *fp;
          register int i;
          struct iovec *iov;
          struct nfsrvw_delayhash *wpp;
          struct ucred *cred;
          struct vattr va, forat;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos, dpos;
          int error = 0, rdonly, cache, len, forat_ret = 1;
          int ioflags, aftat_ret = 1, s, adjust, v3, zeroing;
          char *cp2;
          struct mbuf *mb, *mb2, *mreq, *mrep, *md;
          struct vnode *vp = NULL;
          struct uio io, *uiop = &io;
          u_quad_t frev, cur_usec;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          i = 0;
          len = 0;
  #endif
          *mrq = NULL;
          if (*ndp) {
              nfsd = *ndp;
              *ndp = NULL;
              mrep = nfsd->nd_mrep;
              md = nfsd->nd_md;
              dpos = nfsd->nd_dpos;
              cred = &nfsd->nd_cr;
              v3 = (nfsd->nd_flag & ND_NFSV3);
              LIST_INIT(&nfsd->nd_coalesce);
              nfsd->nd_mreq = NULL;
              nfsd->nd_stable = NFSV3WRITE_FILESYNC;
              cur_usec = nfs_curusec();
              nfsd->nd_time = cur_usec +
                  (v3 ? nfsrvw_procrastinate_v3 : nfsrvw_procrastinate);
      
              /*
               * Now, get the write header..
               */
              nfsm_srvmtofh(&nfsd->nd_fh);
              if (v3) {
                  nfsm_dissect(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
                  fxdr_hyper(tl, &nfsd->nd_off);
                  tl += 3;
                  nfsd->nd_stable = fxdr_unsigned(int, *tl++);
              } else {
                  nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                  nfsd->nd_off = (off_t)fxdr_unsigned(u_int32_t, *++tl);
                  tl += 2;
                  if (nfs_async)
                          nfsd->nd_stable = NFSV3WRITE_UNSTABLE;
              }
              len = fxdr_unsigned(int32_t, *tl);
              nfsd->nd_len = len;
              nfsd->nd_eoff = nfsd->nd_off + len;
      
              /*
               * Trim the header out of the mbuf list and trim off any trailing
               * junk so that the mbuf list has only the write data.
               */
              zeroing = 1;
              i = 0;
              mp = mrep;
              while (mp) {
                  if (mp == md) {
                      zeroing = 0;
                      adjust = dpos - mtod(mp, caddr_t);
                      mp->m_len -= adjust;
                      if (mp->m_len > 0 && adjust > 0)
                          NFSMADV(mp, adjust);
                  }
                  if (zeroing)
                      mp->m_len = 0;
                  else {
                      i += mp->m_len;
                      if (i > len) {
                          mp->m_len -= (i - len);
                          zeroing = 1;
                      }
                  }
                  mp = mp->m_next;
              }
              if (len > NFS_MAXDATA || len < 0  || i < len) {
  nfsmout:
                  m_freem(mrep);
                  error = EIO;
                  nfsm_writereply(2 * NFSX_UNSIGNED, v3);
                  if (v3)
                      nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
                  nfsd->nd_mreq = mreq;
                  nfsd->nd_mrep = NULL;
                  nfsd->nd_time = 0;
              }
      
              /*
               * Add this entry to the hash and time queues.
               */
              s = splsoftclock();
              owp = NULL;
              wp = slp->ns_tq.lh_first;
              while (wp && wp->nd_time < nfsd->nd_time) {
                  owp = wp;
                  wp = wp->nd_tq.le_next;
              }
              NFS_DPF(WG, ("Q%03x", nfsd->nd_retxid & 0xfff));
              if (owp) {
                  LIST_INSERT_AFTER(owp, nfsd, nd_tq);
              } else {
                  LIST_INSERT_HEAD(&slp->ns_tq, nfsd, nd_tq);
              }
              if (nfsd->nd_mrep) {
                  wpp = NWDELAYHASH(slp, nfsd->nd_fh.fh_fid.fid_data);
                  owp = NULL;
                  wp = wpp->lh_first;
                  while (wp &&
                      bcmp((caddr_t)&nfsd->nd_fh,(caddr_t)&wp->nd_fh,NFSX_V3FH)) {
                      owp = wp;
                      wp = wp->nd_hash.le_next;
                  }
                  while (wp && wp->nd_off < nfsd->nd_off &&
                      !bcmp((caddr_t)&nfsd->nd_fh,(caddr_t)&wp->nd_fh,NFSX_V3FH)) {
                      owp = wp;
                      wp = wp->nd_hash.le_next;
                  }
                  if (owp) {
                      LIST_INSERT_AFTER(owp, nfsd, nd_hash);
  
                      /*
                       * Search the hash list for overlapping entries and
                       * coalesce.
                       */
                      for(; nfsd && NFSW_CONTIG(owp, nfsd); nfsd = wp) {
                          wp = nfsd->nd_hash.le_next;
                          if (NFSW_SAMECRED(owp, nfsd))
                              nfsrvw_coalesce(owp, nfsd);
                      }
                  } else {
                      LIST_INSERT_HEAD(wpp, nfsd, nd_hash);
                  }
              }
              splx(s);
          }
      
          /*
           * Now, do VOP_WRITE()s for any one(s) that need to be done now
           * and generate the associated reply mbuf list(s).
           */
  loop1:
          cur_usec = nfs_curusec();
          s = splsoftclock();
          for (nfsd = slp->ns_tq.lh_first; nfsd; nfsd = owp) {
                  owp = nfsd->nd_tq.le_next;
                  if (nfsd->nd_time > cur_usec)
                      break;
                  if (nfsd->nd_mreq)
                      continue;
                  NFS_DPF(WG, ("P%03x", nfsd->nd_retxid & 0xfff));
                  LIST_REMOVE(nfsd, nd_tq);
                  LIST_REMOVE(nfsd, nd_hash);
                  splx(s);
                  mrep = nfsd->nd_mrep;
                  nfsd->nd_mrep = NULL;
                  cred = &nfsd->nd_cr;
                  v3 = (nfsd->nd_flag & ND_NFSV3);
                  forat_ret = aftat_ret = 1;
                  error = nfsrv_fhtovp(&nfsd->nd_fh, 1, &vp, cred, slp, 
                      nfsd->nd_nam, &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
                  if (!error) {
                      if (v3)
                          forat_ret = VOP_GETATTR(vp, &forat, cred, procp);
                      if (vp->v_type != VREG) {
                          if (v3)
                              error = EINVAL;
                          else
                              error = (vp->v_type == VDIR) ? EISDIR : EACCES;
                      }
                  } else {
                      vp = NULL;
                  }
                  if (!error) {
                      nqsrv_getl(vp, ND_WRITE);
                      error = nfsrv_access(vp, VWRITE, cred, rdonly, procp, 1);
                  }
      
                  if (nfsd->nd_stable == NFSV3WRITE_UNSTABLE)
                      ioflags = IO_NODELOCKED;
                  else if (nfsd->nd_stable == NFSV3WRITE_DATASYNC)
                      ioflags = (IO_SYNC | IO_NODELOCKED);
                  else
                      ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED);
                  uiop->uio_rw = UIO_WRITE;
                  uiop->uio_segflg = UIO_SYSSPACE;
                  uiop->uio_procp = (struct proc *)0;
                  uiop->uio_offset = nfsd->nd_off;
                  uiop->uio_resid = nfsd->nd_eoff - nfsd->nd_off;
                  if (uiop->uio_resid > 0) {
                      mp = mrep;
                      i = 0;
                      while (mp) {
                          if (mp->m_len > 0)
                              i++;
                          mp = mp->m_next;
                      }
                      uiop->uio_iovcnt = i;
                      MALLOC(iov, struct iovec *, i * sizeof (struct iovec), 
                          M_TEMP, M_WAITOK);
                      uiop->uio_iov = ivp = iov;
                      mp = mrep;
                      while (mp) {
                          if (mp->m_len > 0) {
                              ivp->iov_base = mtod(mp, caddr_t);
                              ivp->iov_len = mp->m_len;
                              ivp++;
                          }
                          mp = mp->m_next;
                      }
                      if (!error) {
                          error = VOP_WRITE(vp, uiop, ioflags, cred);
                          nfsstats.srvvop_writes++;
                      }
                      FREE((caddr_t)iov, M_TEMP);
                  }
                  m_freem(mrep);
                  if (vp) {
                      aftat_ret = VOP_GETATTR(vp, &va, cred, procp);
                      vput(vp);
                      vp = NULL;
                  }
  
                  /*
                   * Loop around generating replies for all write rpcs that have
                   * now been completed.
                   */
                  swp = nfsd;
                  do {
                      NFS_DPF(WG, ("R%03x", nfsd->nd_retxid & 0xfff));
                      if (error) {
                          nfsm_writereply(NFSX_WCCDATA(v3), v3);
                          if (v3) {
                              nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
                          }
                      } else {
                          nfsm_writereply(NFSX_PREOPATTR(v3) +
                              NFSX_POSTOPORFATTR(v3) + 2 * NFSX_UNSIGNED +
                              NFSX_WRITEVERF(v3), v3);
                          if (v3) {
                              nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
                              nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                              *tl++ = txdr_unsigned(nfsd->nd_len);
                              *tl++ = txdr_unsigned(swp->nd_stable);
                              /*
                               * Actually, there is no need to txdr these fields,
                               * but it may make the values more human readable,
                               * for debugging purposes.
                               */
                              if (nfsver.tv_sec == 0)
                                      nfsver = boottime;
                              *tl++ = txdr_unsigned(nfsver.tv_sec);
                              *tl = txdr_unsigned(nfsver.tv_usec);
                          } else {
                              nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
                              nfsm_srvfillattr(&va, fp);
                          }
                      }
                      nfsd->nd_mreq = mreq;
                      if (nfsd->nd_mrep)
                          panic("nfsrv_write: nd_mrep not free");
  
                      /*
                       * Done. Put it at the head of the timer queue so that
                       * the final phase can return the reply.
                       */
                      s = splsoftclock();
                      if (nfsd != swp) {
                          nfsd->nd_time = 0;
                          LIST_INSERT_HEAD(&slp->ns_tq, nfsd, nd_tq);
                      }
                      nfsd = swp->nd_coalesce.lh_first;
                      if (nfsd) {
                          LIST_REMOVE(nfsd, nd_tq);
                      }
                      splx(s);
                  } while (nfsd);
                  s = splsoftclock();
                  swp->nd_time = 0;
                  LIST_INSERT_HEAD(&slp->ns_tq, swp, nd_tq);
                  splx(s);
                  goto loop1;
          }
          splx(s);
  
          /*
           * Search for a reply to return.
           */
          s = splsoftclock();
          for (nfsd = slp->ns_tq.lh_first; nfsd; nfsd = nfsd->nd_tq.le_next)
                  if (nfsd->nd_mreq) {
                      NFS_DPF(WG, ("X%03x", nfsd->nd_retxid & 0xfff));
                      LIST_REMOVE(nfsd, nd_tq);
                      *mrq = nfsd->nd_mreq;
                      *ndp = nfsd;
                      break;
                  }
          splx(s);
          return (0);
  }
  
  /*
   * Coalesce the write request nfsd into owp. To do this we must:
   * - remove nfsd from the queues
   * - merge nfsd->nd_mrep into owp->nd_mrep
   * - update the nd_eoff and nd_stable for owp
   * - put nfsd on owp's nd_coalesce list
   * NB: Must be called at splsoftclock().
   */
  static void
  nfsrvw_coalesce(owp, nfsd)
          register struct nfsrv_descript *owp;
          register struct nfsrv_descript *nfsd;
  {
          register int overlap;
          register struct mbuf *mp;
          struct nfsrv_descript *p;
  
          NFS_DPF(WG, ("C%03x-%03x",
                       nfsd->nd_retxid & 0xfff, owp->nd_retxid & 0xfff));
          LIST_REMOVE(nfsd, nd_hash);
          LIST_REMOVE(nfsd, nd_tq);
          if (owp->nd_eoff < nfsd->nd_eoff) {
              overlap = owp->nd_eoff - nfsd->nd_off;
              if (overlap < 0)
                  panic("nfsrv_coalesce: bad off");
              if (overlap > 0)
                  m_adj(nfsd->nd_mrep, overlap);
              mp = owp->nd_mrep;
              while (mp->m_next)
                  mp = mp->m_next;
              mp->m_next = nfsd->nd_mrep;
              owp->nd_eoff = nfsd->nd_eoff;
          } else
              m_freem(nfsd->nd_mrep);
          nfsd->nd_mrep = NULL;
          if (nfsd->nd_stable == NFSV3WRITE_FILESYNC)
              owp->nd_stable = NFSV3WRITE_FILESYNC;
          else if (nfsd->nd_stable == NFSV3WRITE_DATASYNC &&
              owp->nd_stable == NFSV3WRITE_UNSTABLE)
              owp->nd_stable = NFSV3WRITE_DATASYNC;
          LIST_INSERT_HEAD(&owp->nd_coalesce, nfsd, nd_tq);
  
          /*
           * If nfsd had anything else coalesced into it, transfer them
           * to owp, otherwise their replies will never get sent.
           */
          for (p = nfsd->nd_coalesce.lh_first; p;
               p = nfsd->nd_coalesce.lh_first) {
              LIST_REMOVE(p, nd_tq);
              LIST_INSERT_HEAD(&owp->nd_coalesce, p, nd_tq);
          }
  }
  
  /*
   * nfs create service
   * now does a truncate to 0 length via. setattr if it already exists
   */
  int
  nfsrv_create(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register struct nfs_fattr *fp;
          struct vattr va, dirfor, diraft;
          register struct vattr *vap = &va;
          register struct nfsv2_sattr *sp;
          register u_int32_t *tl;
          struct nameidata nd;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, rdev, cache, len, tsize, dirfor_ret = 1, diraft_ret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3), how, exclusive_flag = 0;
          caddr_t cp;
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          struct vnode *dirp = (struct vnode *)0;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev, tempsize;
          u_char cverf[NFSX_V3CREATEVERF];
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          rdev = 0;
  #endif
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvnamesiz(len);
  
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = CREATE;
          nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | SAVESTART;
  
          /*
           * Call namei and do initial cleanup to get a few things
           * out of the way.  If we get an initial error we cleanup
           * and return here to avoid special-casing the invalid nd
           * structure through the rest of the case.  dirp may be
           * set even if an error occurs, but the nd structure will not
           * be valid at all if an error occurs so we have to invalidate it
           * prior to calling nfsm_reply ( which might goto nfsmout ).
           */
          error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp) {
                  if (v3) {
                          dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred,
                                  procp);
                  } else {
                          vrele(dirp);
                          dirp = NULL;
                  }
          }
          if (error) {
                  nfsm_reply(NFSX_WCCDATA(v3));
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error=0;
                  goto nfsmout;
          }
  
          /*
           * No error.  Continue.  State:
           *
           *      startdir        is valid ( we release this immediately )
           *      dirp            may be valid
           *      nd.ni_vp        may be valid
           *      nd.ni_dvp       is valid
           *
           * The error state is set through the code and we may also do some
           * opportunistic releasing of vnodes to avoid holding locks through
           * NFS I/O.  The cleanup at the end is a catch-all
           */
  
          VATTR_NULL(vap);
          if (v3) {
                  nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
                  how = fxdr_unsigned(int, *tl);
                  switch (how) {
                  case NFSV3CREATE_GUARDED:
                          if (nd.ni_vp) {
                                  error = EEXIST;
                                  break;
                          }
                          /* fall through */
                  case NFSV3CREATE_UNCHECKED:
                          nfsm_srvsattr(vap);
                          break;
                  case NFSV3CREATE_EXCLUSIVE:
                          nfsm_dissect(cp, caddr_t, NFSX_V3CREATEVERF);
                          bcopy(cp, cverf, NFSX_V3CREATEVERF);
                          exclusive_flag = 1;
                          if (nd.ni_vp == NULL)
                                  vap->va_mode = 0;
                          break;
                  };
                  vap->va_type = VREG;
          } else {
                  nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
                  vap->va_type = IFTOVT(fxdr_unsigned(u_int32_t, sp->sa_mode));
                  if (vap->va_type == VNON)
                          vap->va_type = VREG;
                  vap->va_mode = nfstov_mode(sp->sa_mode);
                  switch (vap->va_type) {
                  case VREG:
                          tsize = fxdr_unsigned(int32_t, sp->sa_size);
                          if (tsize != -1)
                                  vap->va_size = (u_quad_t)tsize;
                          break;
                  case VCHR:
                  case VBLK:
                  case VFIFO:
                          rdev = fxdr_unsigned(long, sp->sa_size);
                          break;
                  default:
                          break;
                  };
          }
  
          /*
           * Iff doesn't exist, create it
           * otherwise just truncate to 0 length
           *   should I set the mode too ?
           *
           * The only possible error we can have at this point is EEXIST. 
           * nd.ni_vp will also be non-NULL in that case.
           */
          if (nd.ni_vp == NULL) {
                  if (vap->va_type == VREG || vap->va_type == VSOCK) {
                          nqsrv_getl(nd.ni_dvp, ND_WRITE);
                          error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
                          if (error) {
                                  nd.ni_cnd.cn_flags &= ~HASBUF;
                          } else {
                                  nfsrv_object_create(nd.ni_vp);
                                  if (exclusive_flag) {
                                          exclusive_flag = 0;
                                          VATTR_NULL(vap);
                                          bcopy(cverf, (caddr_t)&vap->va_atime,
                                                  NFSX_V3CREATEVERF);
                                          error = VOP_SETATTR(nd.ni_vp, vap, cred,
                                                  procp);
                                  }
                          }
                  } else if (
                          vap->va_type == VCHR || 
                          vap->va_type == VBLK ||
                          vap->va_type == VFIFO
                  ) {
                          /*
                           * Handle SysV FIFO node special cases.  All other
                           * devices require super user to access.
                           */
                          if (vap->va_type == VCHR && rdev == 0xffffffff)
                                  vap->va_type = VFIFO;
                          if (vap->va_type != VFIFO &&
                              (error = suser(cred, (u_short *)0))) {
                                  goto nfsmreply0;
                          }
                          vap->va_rdev = (dev_t)rdev;
                          nqsrv_getl(nd.ni_dvp, ND_WRITE);
  
                          /*
                           * VOP_MKNOD returns nd.ni_vp but already releases it,
                           * so we just NULL the pointer.
                           */
                          error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
                          nd.ni_vp = NULL;
                          if (error) {
                                  nd.ni_cnd.cn_flags &= ~HASBUF;
                                  goto nfsmreply0;
                          }
  
                          /*
                           * release dvp prior to lookup
                           */
                          vput(nd.ni_dvp);
                          nd.ni_dvp = NULL;
  
                          /*
                           * Setup for lookup. 
                           *
                           * Even though LOCKPARENT was cleared, ni_dvp may
                           * be garbage. 
                           */
                          nd.ni_cnd.cn_nameiop = LOOKUP;
                          nd.ni_cnd.cn_flags &= ~(LOCKPARENT);
                          nd.ni_cnd.cn_proc = procp;
                          nd.ni_cnd.cn_cred = cred;
  
                          error = lookup(&nd);
                          nd.ni_dvp = NULL;
  
                          if (error != 0) {
                                  nfsm_reply(0);
                                  /* fall through on certain errors */
                          }
                          nfsrv_object_create(nd.ni_vp);
                          if (nd.ni_cnd.cn_flags & ISSYMLINK) {
                                  error = EINVAL;
                                  goto nfsmreply0;
                          }
                  } else {
                          error = ENXIO;
                  }
          } else {
                  if (vap->va_size != -1) {
                          error = nfsrv_access(nd.ni_vp, VWRITE, cred,
                              (nd.ni_cnd.cn_flags & RDONLY), procp, 0);
                          if (!error) {
                                  nqsrv_getl(nd.ni_vp, ND_WRITE);
                                  tempsize = vap->va_size;
                                  VATTR_NULL(vap);
                                  vap->va_size = tempsize;
                                  error = VOP_SETATTR(nd.ni_vp, vap, cred,
                                           procp);
                          }
                  }
          }
  
          if (!error) {
                  bzero((caddr_t)fhp, sizeof(nfh));
                  fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid;
                  error = VFS_VPTOFH(nd.ni_vp, &fhp->fh_fid);
                  if (!error)
                          error = VOP_GETATTR(nd.ni_vp, vap, cred, procp);
          }
          if (v3) {
                  if (exclusive_flag && !error &&
                          bcmp(cverf, (caddr_t)&vap->va_atime, NFSX_V3CREATEVERF))
                          error = EEXIST;
                  diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
                  vrele(dirp);
                  dirp = NULL;
          }
          nfsm_reply(NFSX_SRVFH(v3) + NFSX_FATTR(v3) + NFSX_WCCDATA(v3));
          if (v3) {
                  if (!error) {
                          nfsm_srvpostop_fh(fhp);
                          nfsm_srvpostop_attr(0, vap);
                  }
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
          } else {
                  nfsm_srvfhtom(fhp, v3);
                  nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
                  nfsm_srvfillattr(vap, fp);
          }
          goto nfsmout;
  
  nfsmreply0:
          nfsm_reply(0);
          error = 0;
          /* fall through */
  
  nfsmout:
          if (nd.ni_startdir) {
                  vrele(nd.ni_startdir);
                  nd.ni_startdir = NULL;
          }
          if (dirp)
                  vrele(dirp);
          if (nd.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * Since SAVESTART is set, we own the buffer and need to
                   * zfree it ourselves.
                   */
                  if (nd.ni_dvp)
                          VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
          }
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp)
                  vput(nd.ni_vp);
          return (error);
  }
  
  /*
   * nfs v3 mknod service
   */
  int
  nfsrv_mknod(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          struct vattr va, dirfor, diraft;
          register struct vattr *vap = &va;
          register u_int32_t *tl;
          struct nameidata nd;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, cache, len, dirfor_ret = 1, diraft_ret = 1;
          u_int32_t major, minor;
          enum vtype vtyp;
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          struct vnode *vp, *dirp = (struct vnode *)0;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvnamesiz(len);
  
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = CREATE;
          nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | SAVESTART;
  
          /*
           * Handle nfs_namei() call.  If an error occurs, the nd structure
           * is not valid.  However, nfsm_*() routines may still jump to
           * nfsmout.
           */
  
          error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp)
                  dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred, procp);
          if (error) {
                  nfsm_reply(NFSX_WCCDATA(1));
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
                  goto nfsmout;
          }
          nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
          vtyp = nfsv3tov_type(*tl);
          if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
                  error = NFSERR_BADTYPE;
                  goto out;
          }
          VATTR_NULL(vap);
          nfsm_srvsattr(vap);
          if (vtyp == VCHR || vtyp == VBLK) {
                  nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                  major = fxdr_unsigned(u_int32_t, *tl++);
                  minor = fxdr_unsigned(u_int32_t, *tl);
                  vap->va_rdev = makedev(major, minor);
          }
  
          /*
           * Iff doesn't exist, create it.
           */
          if (nd.ni_vp) {
                  error = EEXIST;
                  goto out;
          }
          vap->va_type = vtyp;
          if (vtyp == VSOCK) {
                  vrele(nd.ni_startdir);
                  nd.ni_startdir = NULL;
                  nqsrv_getl(nd.ni_dvp, ND_WRITE);
                  error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
                  if (error)
                          nd.ni_cnd.cn_flags &= ~HASBUF;
          } else {
                  if (vtyp != VFIFO && (error = suser(cred, (u_short *)0)))
                          goto out;
                  nqsrv_getl(nd.ni_dvp, ND_WRITE);
  
                  /*
                   * VOP_MKNOD does not return a referenced or locked nd.ni_vp,
                   * but it may set it to (in my view) garbage.
                   */
                  error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
                  nd.ni_vp = NULL;
  
                  if (error) {
                          nd.ni_cnd.cn_flags &= ~HASBUF;
                          goto out;
                  }
  
                  /*
                   * Release dvp prior to lookup
                   */
                  vput(nd.ni_dvp);
                  nd.ni_dvp = NULL;
  
                  nd.ni_cnd.cn_nameiop = LOOKUP;
                  nd.ni_cnd.cn_flags &= ~(LOCKPARENT);
                  nd.ni_cnd.cn_proc = procp;
                  nd.ni_cnd.cn_cred = procp->p_ucred;
  
                  error = lookup(&nd);
                  nd.ni_dvp = NULL;
  
                  if (error)
                          goto out;
                  if (nd.ni_cnd.cn_flags & ISSYMLINK)
                          error = EINVAL;
          }
  
          /*
           * send response, cleanup, return.
           */
  out:
          if (nd.ni_startdir) {
                  vrele(nd.ni_startdir);
                  nd.ni_startdir = NULL;
          }
          if (nd.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * Since SAVESTART is set, we own the buffer and need to
                   * zfree it ourselves.
                   */
                  if (nd.ni_dvp)
                          VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  nd.ni_cnd.cn_flags &= ~HASBUF;
                  zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
          }
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
                  nd.ni_dvp = NULL;
          }
          vp = nd.ni_vp;
          if (!error) {
                  bzero((caddr_t)fhp, sizeof(nfh));
                  fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
                  error = VFS_VPTOFH(vp, &fhp->fh_fid);
                  if (!error)
                          error = VOP_GETATTR(vp, vap, cred, procp);
                  vput(vp);
                  vp = NULL;
                  nd.ni_vp = NULL;
          }
          diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
          if (dirp) {
                  vrele(dirp);
                  dirp = NULL;
          }
          nfsm_reply(NFSX_SRVFH(1) + NFSX_POSTOPATTR(1) + NFSX_WCCDATA(1));
          if (!error) {
                  nfsm_srvpostop_fh(fhp);
                  nfsm_srvpostop_attr(0, vap);
          }
          nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
          return (0);
  nfsmout:
          if (dirp)
                  vrele(dirp);
          if (nd.ni_startdir)
                  vrele(nd.ni_startdir);
          if (nd.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * Since SAVESTART is set, we own the buffer and need to
                   * zfree it ourselves.
                   */
                  if (nd.ni_dvp)
                          VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
          }
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp)
                  vput(nd.ni_vp);
          return (error);
  }
  
  /*
   * nfs remove service
   */
  int
  nfsrv_remove(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          struct nameidata nd;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, cache, len, dirfor_ret = 1, diraft_ret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          char *cp2;
          struct mbuf *mb, *mreq;
          struct vnode *dirp;
          struct vattr dirfor, diraft;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvnamesiz(len);
  
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = DELETE;
          nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
          error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp) {
                  if (v3) {
                          dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred,
                                  procp);
                  } else {
                          vrele(dirp);
                          dirp = NULL;
                  }
          }
          if (error == 0) {
                  if (nd.ni_vp->v_type == VDIR) {
                          error = EPERM;          /* POSIX */
                          goto out;
                  }
                  /*
                   * The root of a mounted filesystem cannot be deleted.
                   */
                  if (nd.ni_vp->v_flag & VROOT) {
                          error = EBUSY;
                          goto out;
                  }
  out:
                  if (!error) {
                          nqsrv_getl(nd.ni_dvp, ND_WRITE);
                          nqsrv_getl(nd.ni_vp, ND_WRITE);
                          error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
                          nd.ni_cnd.cn_flags &= ~HASBUF;
                  }
          }
          if (dirp && v3) {
                  diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
                  vrele(dirp);
                  dirp = NULL;
          }
          nfsm_reply(NFSX_WCCDATA(v3));
          if (v3) {
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
          }
  nfsmout:
          if (nd.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * Since SAVESTART is not set, this is sufficient to free
                   * the component buffer.  It's actually a NOP since we
                   * do not save the name, but what the hey.
                   */
                  VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
          }
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp)
                  vput(nd.ni_vp);
          return(error);
  }
  
  /*
   * nfs rename service
   */
  int
  nfsrv_rename(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, cache, len, len2, fdirfor_ret = 1, fdiraft_ret = 1;
          int tdirfor_ret = 1, tdiraft_ret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          char *cp2;
          struct mbuf *mb, *mreq;
          struct nameidata fromnd, tond;
          struct vnode *fvp, *tvp, *tdvp, *fdirp = (struct vnode *)0;
          struct vnode *tdirp = (struct vnode *)0;
          struct vattr fdirfor, fdiraft, tdirfor, tdiraft;
          nfsfh_t fnfh, tnfh;
          fhandle_t *ffhp, *tfhp;
          u_quad_t frev;
          uid_t saved_uid;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          fvp = (struct vnode *)0;
  #endif
          ffhp = &fnfh.fh_generic;
          tfhp = &tnfh.fh_generic;
  
          /*
           * Clear fields incase goto nfsmout occurs from macro.
           */
  
          ndclear(&fromnd);
          ndclear(&tond);
  
          nfsm_srvmtofh(ffhp);
          nfsm_srvnamesiz(len);
          /*
           * Remember our original uid so that we can reset cr_uid before
           * the second nfs_namei() call, in case it is remapped.
           */
          saved_uid = cred->cr_uid;
          fromnd.ni_cnd.cn_cred = cred;
          fromnd.ni_cnd.cn_nameiop = DELETE;
          fromnd.ni_cnd.cn_flags = WANTPARENT | SAVESTART;
          error = nfs_namei(&fromnd, ffhp, len, slp, nam, &md,
                  &dpos, &fdirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (fdirp) {
                  if (v3) {
                          fdirfor_ret = VOP_GETATTR(fdirp, &fdirfor, cred,
                                  procp);
                  } else {
                          vrele(fdirp);
                          fdirp = NULL;
                  }
          }
          if (error) {
                  nfsm_reply(2 * NFSX_WCCDATA(v3));
                  nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft);
                  nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft);
                  error = 0;
                  goto nfsmout;
          }
          fvp = fromnd.ni_vp;
          nfsm_srvmtofh(tfhp);
          nfsm_strsiz(len2, NFS_MAXNAMLEN);
          cred->cr_uid = saved_uid;
          tond.ni_cnd.cn_cred = cred;
          tond.ni_cnd.cn_nameiop = RENAME;
          tond.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART;
          error = nfs_namei(&tond, tfhp, len2, slp, nam, &md,
                  &dpos, &tdirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (tdirp) {
                  if (v3) {
                          tdirfor_ret = VOP_GETATTR(tdirp, &tdirfor, cred,
                                  procp);
                  } else {
                          vrele(tdirp);
                          tdirp = NULL;
                  }
          }
          if (error)
                  goto out1;
  
          tdvp = tond.ni_dvp;
          tvp = tond.ni_vp;
          if (tvp != NULL) {
                  if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
                          if (v3)
                                  error = EEXIST;
                          else
                                  error = EISDIR;
                          goto out;
                  } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
                          if (v3)
                                  error = EEXIST;
                          else
                                  error = ENOTDIR;
                          goto out;
                  }
                  if (tvp->v_type == VDIR && tvp->v_mountedhere) {
                          if (v3)
                                  error = EXDEV;
                          else
                                  error = ENOTEMPTY;
                          goto out;
                  }
          }
          if (fvp->v_type == VDIR && fvp->v_mountedhere) {
                  if (v3)
                          error = EXDEV;
                  else
                          error = ENOTEMPTY;
                  goto out;
          }
          if (fvp->v_mount != tdvp->v_mount) {
                  if (v3)
                          error = EXDEV;
                  else
                          error = ENOTEMPTY;
                  goto out;
          }
          if (fvp == tdvp)
                  if (v3)
                          error = EINVAL;
                  else
                          error = ENOTEMPTY;
          /*
           * If source is the same as the destination (that is the
           * same vnode with the same name in the same directory),
           * then there is nothing to do.
           */
          if (fvp == tvp && fromnd.ni_dvp == tdvp &&
              fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
              !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr,
                fromnd.ni_cnd.cn_namelen))
                  error = -1;
  out:
          if (!error) {
                  /*
                   * Do rename.  If an error occured, the underlying path
                   * components are freed by the VOP routine.  If no error
                   * occured, the SAVESTART flag prevents them from being
                   * freed.
                   *
                   * The VOP_RENAME function releases all vnode references &
                   * locks prior to returning so we need to clear the pointers
                   * to bypass cleanup code later on.
                   */
                  nqsrv_getl(fromnd.ni_dvp, ND_WRITE);
                  nqsrv_getl(tdvp, ND_WRITE);
                  if (tvp) {
                          nqsrv_getl(tvp, ND_WRITE);
                  }
                  error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
                                     tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
                  fromnd.ni_dvp = NULL;
                  fromnd.ni_vp = NULL;
                  tond.ni_dvp = NULL;
                  tond.ni_vp = NULL;
                  if (error) {
                          fromnd.ni_cnd.cn_flags &= ~HASBUF;
                          tond.ni_cnd.cn_flags &= ~HASBUF;
                  }
          } else {
                  if (error == -1)
                          error = 0;
          }
          /* fall through */
  
  out1:
          if (fdirp)
                  fdiraft_ret = VOP_GETATTR(fdirp, &fdiraft, cred, procp);
          if (tdirp)
                  tdiraft_ret = VOP_GETATTR(tdirp, &tdiraft, cred, procp);
          nfsm_reply(2 * NFSX_WCCDATA(v3));
          if (v3) {
                  nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft);
                  nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft);
          }
          error = 0;
          /* fall through */
  
  nfsmout:
          /*
           * Clear out tond related fields
           */
          if (tdirp)
                  vrele(tdirp);
          if (tond.ni_startdir)
                  vrele(tond.ni_startdir);
          if (tond.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * The VOP_ABORTOP is probably a NOP.  Since we have set
                   * SAVESTART, we need to zfree the buffer ourselves.
                   */
                  if (tond.ni_dvp)
                          VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
                  zfree(namei_zone, tond.ni_cnd.cn_pnbuf);
          }
          if (tond.ni_dvp) {
                  if (tond.ni_dvp == tond.ni_vp)
                          vrele(tond.ni_dvp);
                  else
                          vput(tond.ni_dvp);
          }
          if (tond.ni_vp)
                  vput(tond.ni_vp);
  
          /*
           * Clear out fromnd related fields
           */
          if (fdirp)
                  vrele(fdirp);
          if (fromnd.ni_startdir)
                  vrele(fromnd.ni_startdir);
          if (fromnd.ni_cnd.cn_flags & HASBUF) {
                  if (fromnd.ni_dvp)
                          VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
                  zfree(namei_zone, fromnd.ni_cnd.cn_pnbuf);
          }
          if (fromnd.ni_dvp)
                  vrele(fromnd.ni_dvp);
          if (fromnd.ni_vp)
                  vrele(fromnd.ni_vp);
  
          return (error);
  }
  
  /*
   * nfs link service
   */
  int
  nfsrv_link(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          struct nameidata nd;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, rdonly, cache, len, dirfor_ret = 1, diraft_ret = 1;
          int getret = 1, v3 = (nfsd->nd_flag & ND_NFSV3);
          char *cp2;
          struct mbuf *mb, *mreq;
          struct vnode *vp = NULL, *xp, *dirp = (struct vnode *)0;
          struct vattr dirfor, diraft, at;
          nfsfh_t nfh, dnfh;
          fhandle_t *fhp, *dfhp;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          dfhp = &dnfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvmtofh(dfhp);
          nfsm_srvnamesiz(len);
  
          error = nfsrv_fhtovp(fhp, FALSE, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (error) {
                  nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
                  nfsm_srvpostop_attr(getret, &at);
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  vp = NULL;
                  error = 0;
                  goto nfsmout;
          }
          if (vp->v_type == VDIR) {
                  error = EPERM;          /* POSIX */
                  goto out1;
          }
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = CREATE;
          nd.ni_cnd.cn_flags = LOCKPARENT;
          error = nfs_namei(&nd, dfhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp) {
                  if (v3) {
                          dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred,
                                  procp);
                  } else {
                          vrele(dirp);
                          dirp = NULL;
                  }
          }
          if (error)
                  goto out1;
  
          xp = nd.ni_vp;
          if (xp != NULL) {
                  error = EEXIST;
                  goto out;
          }
          xp = nd.ni_dvp;
          if (vp->v_mount != xp->v_mount)
                  error = EXDEV;
  out:
          if (!error) {
                  /*
                   * Do the link op.  Since SAVESTART is not set, the 
                   * underlying path component is freed whether an error
                   * is returned or not.
                   */
                  nqsrv_getl(vp, ND_WRITE);
                  nqsrv_getl(xp, ND_WRITE);
                  error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
                  nd.ni_cnd.cn_flags &= ~HASBUF;
          }
          /* fall through */
  
  out1:
          if (v3)
                  getret = VOP_GETATTR(vp, &at, cred, procp);
          if (dirp)
                  diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
          nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
          if (v3) {
                  nfsm_srvpostop_attr(getret, &at);
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
          }
          /* fall through */
  
  nfsmout:
          if (nd.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * Since we are not using SAVESTART,
                   * VOP_ABORTOP is sufficient to free the path component
                   */
                  VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  /* zfree(namei_zone, nd.ni_cnd.cn_pnbuf); */
          }
          if (dirp)
                  vrele(dirp);
          if (vp)
                  vrele(vp);
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp)
                  vrele(nd.ni_vp);
          return(error);
  }
  
  /*
   * nfs symbolic link service
   */
  int
  nfsrv_symlink(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          struct vattr va, dirfor, diraft;
          struct nameidata nd;
          register struct vattr *vap = &va;
          register u_int32_t *tl;
          register int32_t t1;
          struct nfsv2_sattr *sp;
          char *bpos, *pathcp = (char *)0, *cp2;
          struct uio io;
          struct iovec iv;
          int error = 0, cache, len, len2, dirfor_ret = 1, diraft_ret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          struct mbuf *mb, *mreq, *mb2;
          struct vnode *dirp = (struct vnode *)0;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvnamesiz(len);
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = CREATE;
          nd.ni_cnd.cn_flags = LOCKPARENT | SAVESTART;
          error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp) {
                  if (v3) {
                          dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred,
                                  procp);
                  } else {
                          vrele(dirp);
                          dirp = NULL;
                  }
          }
          if (error)
                  goto out;
  
          VATTR_NULL(vap);
          if (v3)
                  nfsm_srvsattr(vap);
          nfsm_strsiz(len2, NFS_MAXPATHLEN);
          MALLOC(pathcp, caddr_t, len2 + 1, M_TEMP, M_WAITOK);
          iv.iov_base = pathcp;
          iv.iov_len = len2;
          io.uio_resid = len2;
          io.uio_offset = 0;
          io.uio_iov = &iv;
          io.uio_iovcnt = 1;
          io.uio_segflg = UIO_SYSSPACE;
          io.uio_rw = UIO_READ;
          io.uio_procp = (struct proc *)0;
          nfsm_mtouio(&io, len2);
          if (!v3) {
                  nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
                  vap->va_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
          }
          *(pathcp + len2) = '\0';
          if (nd.ni_vp) {
                  error = EEXIST;
                  goto out;
          }
  
          /*
           * issue symlink op.  SAVESTART is set so the underlying path component
           * is only freed by the VOP if an error occurs.  VOP_SYMLINK does not
           * return a referenced ni_vp, but it may fill the pointer with garbage.
           */
          nqsrv_getl(nd.ni_dvp, ND_WRITE);
          error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap, pathcp);
          nd.ni_vp = NULL;
          if (error)
                  nd.ni_cnd.cn_flags &= ~HASBUF;
          /*
           * releases directory prior to potential lookup op.
           */
          vput(nd.ni_dvp);
          nd.ni_dvp = NULL;
  
          if (error == 0) {
              if (v3) {
                  /*
                   * Issue lookup.  Leave SAVESTART set so we can easily free
                   * the name buffer later on.
                   *
                   * since LOCKPARENT is not set, ni_dvp will be garbage on
                   * return whether an error occurs or not.
                   */
                  nd.ni_cnd.cn_nameiop = LOOKUP;
                  nd.ni_cnd.cn_flags &= ~(LOCKPARENT | FOLLOW);
                  nd.ni_cnd.cn_flags |= (NOFOLLOW | LOCKLEAF);
                  nd.ni_cnd.cn_proc = procp;
                  nd.ni_cnd.cn_cred = cred;
  
                  error = lookup(&nd);
                  nd.ni_dvp = NULL;
  
                  if (error == 0) {
                          bzero((caddr_t)fhp, sizeof(nfh));
                          fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid;
                          error = VFS_VPTOFH(nd.ni_vp, &fhp->fh_fid);
                          if (!error)
                                  error = VOP_GETATTR(nd.ni_vp, vap, cred,
                                          procp);
                          vput(nd.ni_vp);
                          nd.ni_vp = NULL;
                  }
              }
          }
  out:
          /*
           * These releases aren't strictly required, does even doing them
           * make any sense? XXX can nfsm_reply() block?
           */
          if (pathcp) {
                  FREE(pathcp, M_TEMP);
                  pathcp = NULL;
          }
          if (dirp) {
                  diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
                  vrele(dirp);
                  dirp = NULL;
          }
          if (nd.ni_startdir) {
                  vrele(nd.ni_startdir);
                  nd.ni_startdir = NULL;
          }
          nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
          if (v3) {
                  if (!error) {
                          nfsm_srvpostop_fh(fhp);
                          nfsm_srvpostop_attr(0, vap);
                  }
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
          }
          error = 0;
          /* fall through */
  
  nfsmout:
          if (nd.ni_cnd.cn_flags & HASBUF) {
                  /*
                   * Since SAVESTART is set, we own the buffer and need to
                   * zfree it ourselves.
                   */
                  if (nd.ni_dvp)
                          VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
          }
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp)
                  vrele(nd.ni_vp);
          if (nd.ni_startdir)
                  vrele(nd.ni_startdir);
          if (dirp)
                  vrele(dirp);
          if (pathcp)
                  FREE(pathcp, M_TEMP);
  
          return (error);
  }
  
  /*
   * nfs mkdir service
   */
  int
  nfsrv_mkdir(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          struct vattr va, dirfor, diraft;
          register struct vattr *vap = &va;
          register struct nfs_fattr *fp;
          struct nameidata nd;
          register caddr_t cp;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, cache, len, dirfor_ret = 1, diraft_ret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          struct vnode *dirp = NULL;
          int vpexcl = 0;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvnamesiz(len);
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = CREATE;
          nd.ni_cnd.cn_flags = LOCKPARENT;
  
          error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp) {
                  if (v3) {
                          dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred,
                                  procp);
                  } else {
                          vrele(dirp);
                          dirp = NULL;
                  }
          }
          if (error) {
                  nfsm_reply(NFSX_WCCDATA(v3));
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
                  goto nfsmout;
          }
          VATTR_NULL(vap);
          if (v3) {
                  nfsm_srvsattr(vap);
          } else {
                  nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
                  vap->va_mode = nfstov_mode(*tl++);
          }
  
          /*
           * At this point nd.ni_dvp is referenced and exclusively locked and
           * nd.ni_vp, if it exists, is referenced but not locked.
           */
  
          vap->va_type = VDIR;
          if (nd.ni_vp != NULL) {
                  /*
                   * Freeup path component.  Since SAVESTART was not set,
                   * VOP_ABORTOP() will handle it.
                   */
                  VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  nd.ni_cnd.cn_flags &= ~HASBUF;
                  error = EEXIST;
                  goto out;
          }
  
          /*
           * Issue mkdir op.  Since SAVESTART is not set, the pathname 
           * component is freed by the VOP call.  This will fill-in
           * nd.ni_vp, reference, and exclusively lock it.
           */
          nqsrv_getl(nd.ni_dvp, ND_WRITE);
          error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
          nd.ni_cnd.cn_flags &= ~HASBUF;
          vpexcl = 1;
  
          vput(nd.ni_dvp);
          nd.ni_dvp = NULL;
  
          if (!error) {
                  bzero((caddr_t)fhp, sizeof(nfh));
                  fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid;
                  error = VFS_VPTOFH(nd.ni_vp, &fhp->fh_fid);
                  if (!error)
                          error = VOP_GETATTR(nd.ni_vp, vap, cred, procp);
          }
  out:
          if (dirp)
                  diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
          nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
          if (v3) {
                  if (!error) {
                          nfsm_srvpostop_fh(fhp);
                          nfsm_srvpostop_attr(0, vap);
                  }
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
          } else {
                  nfsm_srvfhtom(fhp, v3);
                  nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
                  nfsm_srvfillattr(vap, fp);
          }
          error = 0;
          /* fall through */
  
  nfsmout:
          if (dirp)
                  vrele(dirp);
          if (nd.ni_dvp) {
                  /*
                   * Since SAVESTART is not set, VOP_ABORTOP will always free
                   * the path component.
                   */
                  if (nd.ni_cnd.cn_flags & HASBUF)
                          VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
                  if (nd.ni_dvp == nd.ni_vp && vpexcl)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp) {
                  if (vpexcl)
                          vput(nd.ni_vp);
                  else
                          vrele(nd.ni_vp);
          }
          return (error);
  }
  
  /*
   * nfs rmdir service
   */
  int
  nfsrv_rmdir(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, cache, len, dirfor_ret = 1, diraft_ret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          char *cp2;
          struct mbuf *mb, *mreq;
          struct vnode *vp, *dirp = (struct vnode *)0;
          struct vattr dirfor, diraft;
          nfsfh_t nfh;
          fhandle_t *fhp;
          struct nameidata nd;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          ndclear(&nd);
  
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_srvnamesiz(len);
          nd.ni_cnd.cn_cred = cred;
          nd.ni_cnd.cn_nameiop = DELETE;
          nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
          error = nfs_namei(&nd, fhp, len, slp, nam, &md, &dpos,
                  &dirp, procp, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
          if (dirp) {
                  if (v3) {
                          dirfor_ret = VOP_GETATTR(dirp, &dirfor, cred,
                                  procp);
                  } else {
                          vrele(dirp);
                          dirp = NULL;
                  }
          }
          if (error) {
                  nfsm_reply(NFSX_WCCDATA(v3));
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
                  goto nfsmout;
          }
          vp = nd.ni_vp;
          if (vp->v_type != VDIR) {
                  error = ENOTDIR;
                  goto out;
          }
          /*
           * No rmdir "." please.
           */
          if (nd.ni_dvp == vp) {
                  error = EINVAL;
                  goto out;
          }
          /*
           * The root of a mounted filesystem cannot be deleted.
           */
          if (vp->v_flag & VROOT)
                  error = EBUSY;
  out:
          /*
           * Issue or abort op.  Since SAVESTART is not set, path name
           * component is freed by the VOP after either.
           */
          if (!error) {
                  nqsrv_getl(nd.ni_dvp, ND_WRITE);
                  nqsrv_getl(vp, ND_WRITE);
                  error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
          } else {
                  VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
          }
          nd.ni_cnd.cn_flags &= ~HASBUF;
  
          if (dirp)
                  diraft_ret = VOP_GETATTR(dirp, &diraft, cred, procp);
          nfsm_reply(NFSX_WCCDATA(v3));
          if (v3) {
                  nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
                  error = 0;
          }
          /* fall through */
  
  nfsmout:
          /*
           * Since SAVESTART is not set, a VOP_ABORTOP is sufficient to
           * deal with the pathname component.
           */
          if (nd.ni_cnd.cn_flags & HASBUF)
                  VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
          if (dirp)
                  vrele(dirp);
          if (nd.ni_dvp) {
                  if (nd.ni_dvp == nd.ni_vp)
                          vrele(nd.ni_dvp);
                  else
                          vput(nd.ni_dvp);
          }
          if (nd.ni_vp)
                  vput(nd.ni_vp);
  
          return(error);
  }
  
  /*
   * nfs readdir service
   * - mallocs what it thinks is enough to read
   *      count rounded up to a multiple of NFS_DIRBLKSIZ <= NFS_MAXREADDIR
   * - calls VOP_READDIR()
   * - loops around building the reply
   *      if the output generated exceeds count break out of loop
   *      The nfsm_clget macro is used here so that the reply will be packed
   *      tightly in mbuf clusters.
   * - it only knows that it has encountered eof when the VOP_READDIR()
   *      reads nothing
   * - as such one readdir rpc will return eof false although you are there
   *      and then the next will return eof
   * - it trims out records with d_fileno == 0
   *      this doesn't matter for Unix clients, but they might confuse clients
   *      for other os'.
   * NB: It is tempting to set eof to true if the VOP_READDIR() reads less
   *      than requested, but this may not apply to all filesystems. For
   *      example, client NFS does not { although it is never remote mounted
   *      anyhow }
   *     The alternate call nfsrv_readdirplus() does lookups as well.
   * PS: The NFS protocol spec. does not clarify what the "count" byte
   *      argument is a count of.. just name strings and file id's or the
   *      entire reply rpc or ...
   *      I tried just file name and id sizes and it confused the Sun client,
   *      so I am using the full rpc size now. The "paranoia.." comment refers
   *      to including the status longwords that are not a part of the dir.
   *      "entry" structures, but are in the rpc.
   */
  struct flrep {
          nfsuint64       fl_off;
          u_int32_t       fl_postopok;
          u_int32_t       fl_fattr[NFSX_V3FATTR / sizeof (u_int32_t)];
          u_int32_t       fl_fhok;
          u_int32_t       fl_fhsize;
          u_int32_t       fl_nfh[NFSX_V3FH / sizeof (u_int32_t)];
  };
  
  int
  nfsrv_readdir(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register char *bp, *be;
          register struct mbuf *mp;
          register struct dirent *dp;
          register caddr_t cp;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          struct mbuf *mb, *mb2, *mreq, *mp2;
          char *cpos, *cend, *cp2, *rbuf;
          struct vnode *vp = NULL;
          struct vattr at;
          nfsfh_t nfh;
          fhandle_t *fhp;
          struct uio io;
          struct iovec iv;
          int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1;
          int siz, cnt, fullsiz, eofflag, rdonly, cache, ncookies;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          u_quad_t frev, off, toff, verf;
          u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          if (v3) {
                  nfsm_dissect(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
                  fxdr_hyper(tl, &toff);
                  tl += 2;
                  fxdr_hyper(tl, &verf);
                  tl += 2;
          } else {
                  nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                  toff = fxdr_unsigned(u_quad_t, *tl++);
          }
          off = toff;
          cnt = fxdr_unsigned(int, *tl);
          siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
          xfer = NFS_SRVMAXDATA(nfsd);
          if (siz > xfer)
                  siz = xfer;
          fullsiz = siz;
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (!error && vp->v_type != VDIR) {
                  error = ENOTDIR;
                  vput(vp);
                  vp = NULL;
          }
          if (error) {
                  nfsm_reply(NFSX_UNSIGNED);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
  
          /*
           * Obtain lock on vnode for this section of the code
           */
  
          nqsrv_getl(vp, ND_READ);
          if (v3) {
                  error = getret = VOP_GETATTR(vp, &at, cred, procp);
  #if 0
                  /*
                   * XXX This check may be too strict for Solaris 2.5 clients.
                   */
                  if (!error && toff && verf && verf != at.va_filerev)
                          error = NFSERR_BAD_COOKIE;
  #endif
          }
          if (!error)
                  error = nfsrv_access(vp, VEXEC, cred, rdonly, procp, 0);
          if (error) {
                  vput(vp);
                  vp = NULL;
                  nfsm_reply(NFSX_POSTOPATTR(v3));
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          VOP_UNLOCK(vp, 0, procp);
  
          /*
           * end section.  Allocate rbuf and continue
           */
          MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
  again:
          iv.iov_base = rbuf;
          iv.iov_len = fullsiz;
          io.uio_iov = &iv;
          io.uio_iovcnt = 1;
          io.uio_offset = (off_t)off;
          io.uio_resid = fullsiz;
          io.uio_segflg = UIO_SYSSPACE;
          io.uio_rw = UIO_READ;
          io.uio_procp = (struct proc *)0;
          eofflag = 0;
          vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, procp);
          if (cookies) {
                  free((caddr_t)cookies, M_TEMP);
                  cookies = NULL;
          }
          error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies);
          off = (off_t)io.uio_offset;
          if (!cookies && !error)
                  error = NFSERR_PERM;
          if (v3) {
                  getret = VOP_GETATTR(vp, &at, cred, procp);
                  if (!error)
                          error = getret;
          }
          VOP_UNLOCK(vp, 0, procp);
          if (error) {
                  vrele(vp);
                  vp = NULL;
                  free((caddr_t)rbuf, M_TEMP);
                  if (cookies)
                          free((caddr_t)cookies, M_TEMP);
                  nfsm_reply(NFSX_POSTOPATTR(v3));
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          if (io.uio_resid) {
                  siz -= io.uio_resid;
  
                  /*
                   * If nothing read, return eof
                   * rpc reply
                   */
                  if (siz == 0) {
                          vrele(vp);
                          vp = NULL;
                          nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) +
                                  2 * NFSX_UNSIGNED);
                          if (v3) {
                                  nfsm_srvpostop_attr(getret, &at);
                                  nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                                  txdr_hyper(&at.va_filerev, tl);
                                  tl += 2;
                          } else
                                  nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                          *tl++ = nfs_false;
                          *tl = nfs_true;
                          FREE((caddr_t)rbuf, M_TEMP);
                          FREE((caddr_t)cookies, M_TEMP);
                          error = 0;
                          goto nfsmout;
                  }
          }
  
          /*
           * Check for degenerate cases of nothing useful read.
           * If so go try again
           */
          cpos = rbuf;
          cend = rbuf + siz;
          dp = (struct dirent *)cpos;
          cookiep = cookies;
          /*
           * For some reason FreeBSD's ufs_readdir() chooses to back the
           * directory offset up to a block boundary, so it is necessary to
           * skip over the records that preceed the requested offset. This
           * requires the assumption that file offset cookies monotonically
           * increase.
           */
          while (cpos < cend && ncookies > 0 &&
                  (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
                   ((u_quad_t)(*cookiep)) <= toff)) {
                  cpos += dp->d_reclen;
                  dp = (struct dirent *)cpos;
                  cookiep++;
                  ncookies--;
          }
          if (cpos >= cend || ncookies == 0) {
                  toff = off;
                  siz = fullsiz;
                  goto again;
          }
  
          len = 3 * NFSX_UNSIGNED;        /* paranoia, probably can be 0 */
          nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) + siz);
          if (v3) {
                  nfsm_srvpostop_attr(getret, &at);
                  nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                  txdr_hyper(&at.va_filerev, tl);
          }
          mp = mp2 = mb;
          bp = bpos;
          be = bp + M_TRAILINGSPACE(mp);
  
          /* Loop through the records and build reply */
          while (cpos < cend && ncookies > 0) {
                  if (dp->d_fileno != 0 && dp->d_type != DT_WHT) {
                          nlen = dp->d_namlen;
                          rem = nfsm_rndup(nlen) - nlen;
                          len += (4 * NFSX_UNSIGNED + nlen + rem);
                          if (v3)
                                  len += 2 * NFSX_UNSIGNED;
                          if (len > cnt) {
                                  eofflag = 0;
                                  break;
                          }
                          /*
                           * Build the directory record xdr from
                           * the dirent entry.
                           */
                          nfsm_clget;
                          *tl = nfs_true;
                          bp += NFSX_UNSIGNED;
                          if (v3) {
                                  nfsm_clget;
                                  *tl = 0;
                                  bp += NFSX_UNSIGNED;
                          }
                          nfsm_clget;
                          *tl = txdr_unsigned(dp->d_fileno);
                          bp += NFSX_UNSIGNED;
                          nfsm_clget;
                          *tl = txdr_unsigned(nlen);
                          bp += NFSX_UNSIGNED;
  
                          /* And loop around copying the name */
                          xfer = nlen;
                          cp = dp->d_name;
                          while (xfer > 0) {
                                  nfsm_clget;
                                  if ((bp+xfer) > be)
                                          tsiz = be-bp;
                                  else
                                          tsiz = xfer;
                                  bcopy(cp, bp, tsiz);
                                  bp += tsiz;
                                  xfer -= tsiz;
                                  if (xfer > 0)
                                          cp += tsiz;
                          }
                          /* And null pad to a int32_t boundary */
                          for (i = 0; i < rem; i++)
                                  *bp++ = '\0';
                          nfsm_clget;
  
                          /* Finish off the record */
                          if (v3) {
                                  *tl = 0;
                                  bp += NFSX_UNSIGNED;
                                  nfsm_clget;
                          }
                          *tl = txdr_unsigned(*cookiep);
                          bp += NFSX_UNSIGNED;
                  }
                  cpos += dp->d_reclen;
                  dp = (struct dirent *)cpos;
                  cookiep++;
                  ncookies--;
          }
          vrele(vp);
          vp = NULL;
          nfsm_clget;
          *tl = nfs_false;
          bp += NFSX_UNSIGNED;
          nfsm_clget;
          if (eofflag)
                  *tl = nfs_true;
          else
                  *tl = nfs_false;
          bp += NFSX_UNSIGNED;
          if (mp != mb) {
                  if (bp < be)
                          mp->m_len = bp - mtod(mp, caddr_t);
          } else
                  mp->m_len += bp - bpos;
          FREE((caddr_t)rbuf, M_TEMP);
          FREE((caddr_t)cookies, M_TEMP);
  
  nfsmout:
          if (vp)
                  vrele(vp);
          return(error);
  }
  
  int
  nfsrv_readdirplus(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register char *bp, *be;
          register struct mbuf *mp;
          register struct dirent *dp;
          register caddr_t cp;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          struct mbuf *mb, *mb2, *mreq, *mp2;
          char *cpos, *cend, *cp2, *rbuf;
          struct vnode *vp = NULL, *nvp;
          struct flrep fl;
          nfsfh_t nfh;
          fhandle_t *fhp, *nfhp = (fhandle_t *)fl.fl_nfh;
          struct uio io;
          struct iovec iv;
          struct vattr va, at, *vap = &va;
          struct nfs_fattr *fp;
          int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1;
          int siz, cnt, fullsiz, eofflag, rdonly, cache, dirlen, ncookies;
          u_quad_t frev, off, toff, verf;
          u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_dissect(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
          fxdr_hyper(tl, &toff);
          tl += 2;
          fxdr_hyper(tl, &verf);
          tl += 2;
          siz = fxdr_unsigned(int, *tl++);
          cnt = fxdr_unsigned(int, *tl);
          off = toff;
          siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
          xfer = NFS_SRVMAXDATA(nfsd);
          if (siz > xfer)
                  siz = xfer;
          fullsiz = siz;
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (!error && vp->v_type != VDIR) {
                  error = ENOTDIR;
                  vput(vp);
                  vp = NULL;
          }
          if (error) {
                  nfsm_reply(NFSX_UNSIGNED);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          error = getret = VOP_GETATTR(vp, &at, cred, procp);
          /*
           * XXX This check may be too strict for Solaris 2.5 clients.
           */
  #if 0
          if (!error && toff && verf && verf != at.va_filerev)
                  error = NFSERR_BAD_COOKIE;
  #endif
          if (!error) {
                  nqsrv_getl(vp, ND_READ);
                  error = nfsrv_access(vp, VEXEC, cred, rdonly, procp, 0);
          }
          if (error) {
                  vput(vp);
                  vp = NULL;
                  nfsm_reply(NFSX_V3POSTOPATTR);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          VOP_UNLOCK(vp, 0, procp);
          MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
  again:
          iv.iov_base = rbuf;
          iv.iov_len = fullsiz;
          io.uio_iov = &iv;
          io.uio_iovcnt = 1;
          io.uio_offset = (off_t)off;
          io.uio_resid = fullsiz;
          io.uio_segflg = UIO_SYSSPACE;
          io.uio_rw = UIO_READ;
          io.uio_procp = (struct proc *)0;
          eofflag = 0;
          vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, procp);
          if (cookies) {
                  free((caddr_t)cookies, M_TEMP);
                  cookies = NULL;
          }
          error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies);
          off = (u_quad_t)io.uio_offset;
          getret = VOP_GETATTR(vp, &at, cred, procp);
          VOP_UNLOCK(vp, 0, procp);
          if (!cookies && !error)
                  error = NFSERR_PERM;
          if (!error)
                  error = getret;
          if (error) {
                  vrele(vp);
                  vp = NULL;
                  if (cookies)
                          free((caddr_t)cookies, M_TEMP);
                  free((caddr_t)rbuf, M_TEMP);
                  nfsm_reply(NFSX_V3POSTOPATTR);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          if (io.uio_resid) {
                  siz -= io.uio_resid;
  
                  /*
                   * If nothing read, return eof
                   * rpc reply
                   */
                  if (siz == 0) {
                          vrele(vp);
                          vp = NULL;
                          nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF +
                                  2 * NFSX_UNSIGNED);
                          nfsm_srvpostop_attr(getret, &at);
                          nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                          txdr_hyper(&at.va_filerev, tl);
                          tl += 2;
                          *tl++ = nfs_false;
                          *tl = nfs_true;
                          FREE((caddr_t)cookies, M_TEMP);
                          FREE((caddr_t)rbuf, M_TEMP);
                          error = 0;
                          goto nfsmout;
                  }
          }
  
          /*
           * Check for degenerate cases of nothing useful read.
           * If so go try again
           */
          cpos = rbuf;
          cend = rbuf + siz;
          dp = (struct dirent *)cpos;
          cookiep = cookies;
          /*
           * For some reason FreeBSD's ufs_readdir() chooses to back the
           * directory offset up to a block boundary, so it is necessary to
           * skip over the records that preceed the requested offset. This
           * requires the assumption that file offset cookies monotonically
           * increase.
           */
          while (cpos < cend && ncookies > 0 &&
                  (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
                   ((u_quad_t)(*cookiep)) <= toff)) {
                  cpos += dp->d_reclen;
                  dp = (struct dirent *)cpos;
                  cookiep++;
                  ncookies--;
          }
          if (cpos >= cend || ncookies == 0) {
                  toff = off;
                  siz = fullsiz;
                  goto again;
          }
  
          /*
           * Probe one of the directory entries to see if the filesystem
           * supports VGET.
           */
          if (VFS_VGET(vp->v_mount, dp->d_fileno, &nvp) == EOPNOTSUPP) {
                  error = NFSERR_NOTSUPP;
                  vrele(vp);
                  vp = NULL;
                  free((caddr_t)cookies, M_TEMP);
                  free((caddr_t)rbuf, M_TEMP);
                  nfsm_reply(NFSX_V3POSTOPATTR);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          vput(nvp);
          nvp = NULL;
              
          dirlen = len = NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF + 2 * NFSX_UNSIGNED;
          nfsm_reply(cnt);
          nfsm_srvpostop_attr(getret, &at);
          nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
          txdr_hyper(&at.va_filerev, tl);
          mp = mp2 = mb;
          bp = bpos;
          be = bp + M_TRAILINGSPACE(mp);
  
          /* Loop through the records and build reply */
          while (cpos < cend && ncookies > 0) {
                  if (dp->d_fileno != 0 && dp->d_type != DT_WHT) {
                          nlen = dp->d_namlen;
                          rem = nfsm_rndup(nlen)-nlen;
  
                          /*
                           * For readdir_and_lookup get the vnode using
                           * the file number.
                           */
                          if (VFS_VGET(vp->v_mount, dp->d_fileno, &nvp))
                                  goto invalid;
                          bzero((caddr_t)nfhp, NFSX_V3FH);
                          nfhp->fh_fsid =
                                  nvp->v_mount->mnt_stat.f_fsid;
                          if (VFS_VPTOFH(nvp, &nfhp->fh_fid)) {
                                  vput(nvp);
                                  nvp = NULL;
                                  goto invalid;
                          }
                          if (VOP_GETATTR(nvp, vap, cred, procp)) {
                                  vput(nvp);
                                  nvp = NULL;
                                  goto invalid;
                          }
                          vput(nvp);
                          nvp = NULL;
  
                          /*
                           * If either the dircount or maxcount will be
                           * exceeded, get out now. Both of these lengths
                           * are calculated conservatively, including all
                           * XDR overheads.
                           */
                          len += (8 * NFSX_UNSIGNED + nlen + rem + NFSX_V3FH +
                                  NFSX_V3POSTOPATTR);
                          dirlen += (6 * NFSX_UNSIGNED + nlen + rem);
                          if (len > cnt || dirlen > fullsiz) {
                                  eofflag = 0;
                                  break;
                          }
  
                          /*
                           * Build the directory record xdr from
                           * the dirent entry.
                           */
                          fp = (struct nfs_fattr *)&fl.fl_fattr;
                          nfsm_srvfillattr(vap, fp);
                          fl.fl_fhsize = txdr_unsigned(NFSX_V3FH);
                          fl.fl_fhok = nfs_true;
                          fl.fl_postopok = nfs_true;
                          fl.fl_off.nfsuquad[0] = 0;
                          fl.fl_off.nfsuquad[1] = txdr_unsigned(*cookiep);
  
                          nfsm_clget;
                          *tl = nfs_true;
                          bp += NFSX_UNSIGNED;
                          nfsm_clget;
                          *tl = 0;
                          bp += NFSX_UNSIGNED;
                          nfsm_clget;
                          *tl = txdr_unsigned(dp->d_fileno);
                          bp += NFSX_UNSIGNED;
                          nfsm_clget;
                          *tl = txdr_unsigned(nlen);
                          bp += NFSX_UNSIGNED;
  
                          /* And loop around copying the name */
                          xfer = nlen;
                          cp = dp->d_name;
                          while (xfer > 0) {
                                  nfsm_clget;
                                  if ((bp + xfer) > be)
                                          tsiz = be - bp;
                                  else
                                          tsiz = xfer;
                                  bcopy(cp, bp, tsiz);
                                  bp += tsiz;
                                  xfer -= tsiz;
                                  if (xfer > 0)
                                          cp += tsiz;
                          }
                          /* And null pad to a int32_t boundary */
                          for (i = 0; i < rem; i++)
                                  *bp++ = '\0';
          
                          /*
                           * Now copy the flrep structure out.
                           */
                          xfer = sizeof (struct flrep);
                          cp = (caddr_t)&fl;
                          while (xfer > 0) {
                                  nfsm_clget;
                                  if ((bp + xfer) > be)
                                          tsiz = be - bp;
                                  else
                                          tsiz = xfer;
                                  bcopy(cp, bp, tsiz);
                                  bp += tsiz;
                                  xfer -= tsiz;
                                  if (xfer > 0)
                                          cp += tsiz;
                          }
                  }
  invalid:
                  cpos += dp->d_reclen;
                  dp = (struct dirent *)cpos;
                  cookiep++;
                  ncookies--;
          }
          vrele(vp);
          vp = NULL;
          nfsm_clget;
          *tl = nfs_false;
          bp += NFSX_UNSIGNED;
          nfsm_clget;
          if (eofflag)
                  *tl = nfs_true;
          else
                  *tl = nfs_false;
          bp += NFSX_UNSIGNED;
          if (mp != mb) {
                  if (bp < be)
                          mp->m_len = bp - mtod(mp, caddr_t);
          } else
                  mp->m_len += bp - bpos;
          FREE((caddr_t)cookies, M_TEMP);
          FREE((caddr_t)rbuf, M_TEMP);
  nfsmout:
          if (vp)
                  vrele(vp);
          return(error);
  }
  
  /*
   * nfs commit service
   */
  int
  nfsrv_commit(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          struct vattr bfor, aft;
          struct vnode *vp = NULL;
          nfsfh_t nfh;
          fhandle_t *fhp;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, rdonly, for_ret = 1, aft_ret = 1, cnt, cache;
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          u_quad_t frev, off;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          cache = 0;
  #endif
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  
          /*
           * XXX At this time VOP_FSYNC() does not accept offset and byte
           * count parameters, so these arguments are useless (someday maybe).
           */
          fxdr_hyper(tl, &off);
          tl += 2;
          cnt = fxdr_unsigned(int, *tl);
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (error) {
                  nfsm_reply(2 * NFSX_UNSIGNED);
                  nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft);
                  error = 0;
                  goto nfsmout;
          }
          for_ret = VOP_GETATTR(vp, &bfor, cred, procp);
          if (vp->v_object &&
             (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
                          vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
          }
          error = VOP_FSYNC(vp, cred, MNT_WAIT, procp);
          aft_ret = VOP_GETATTR(vp, &aft, cred, procp);
          vput(vp);
          vp = NULL;
          nfsm_reply(NFSX_V3WCCDATA + NFSX_V3WRITEVERF);
          nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft);
          if (!error) {
                  nfsm_build(tl, u_int32_t *, NFSX_V3WRITEVERF);
                  if (nfsver.tv_sec == 0)
                          nfsver = boottime;
                  *tl++ = txdr_unsigned(nfsver.tv_sec);
                  *tl = txdr_unsigned(nfsver.tv_usec);
          } else {
                  error = 0;
          }
  nfsmout:
          if (vp)
                  vput(vp);
          return(error);
  }
  
  /*
   * nfs statfs service
   */
  int
  nfsrv_statfs(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register struct statfs *sf;
          register struct nfs_statfs *sfp;
          register u_int32_t *tl;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, rdonly, cache, getret = 1;
          int v3 = (nfsd->nd_flag & ND_NFSV3);
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          struct vnode *vp = NULL;
          struct vattr at;
          nfsfh_t nfh;
          fhandle_t *fhp;
          struct statfs statfs;
          u_quad_t frev, tval;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          cache = 0;
  #endif
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (error) {
                  nfsm_reply(NFSX_UNSIGNED);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          sf = &statfs;
          error = VFS_STATFS(vp->v_mount, sf, procp);
          getret = VOP_GETATTR(vp, &at, cred, procp);
          vput(vp);
          vp = NULL;
          nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_STATFS(v3));
          if (v3)
                  nfsm_srvpostop_attr(getret, &at);
          if (error) {
                  error = 0;
                  goto nfsmout;
          }
          nfsm_build(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
          if (v3) {
                  tval = (u_quad_t)sf->f_blocks;
                  tval *= (u_quad_t)sf->f_bsize;
                  txdr_hyper(&tval, &sfp->sf_tbytes);
                  tval = (u_quad_t)sf->f_bfree;
                  tval *= (u_quad_t)sf->f_bsize;
                  txdr_hyper(&tval, &sfp->sf_fbytes);
                  tval = (u_quad_t)sf->f_bavail;
                  tval *= (u_quad_t)sf->f_bsize;
                  txdr_hyper(&tval, &sfp->sf_abytes);
                  sfp->sf_tfiles.nfsuquad[0] = 0;
                  sfp->sf_tfiles.nfsuquad[1] = txdr_unsigned(sf->f_files);
                  sfp->sf_ffiles.nfsuquad[0] = 0;
                  sfp->sf_ffiles.nfsuquad[1] = txdr_unsigned(sf->f_ffree);
                  sfp->sf_afiles.nfsuquad[0] = 0;
                  sfp->sf_afiles.nfsuquad[1] = txdr_unsigned(sf->f_ffree);
                  sfp->sf_invarsec = 0;
          } else {
                  sfp->sf_tsize = txdr_unsigned(NFS_MAXDGRAMDATA);
                  sfp->sf_bsize = txdr_unsigned(sf->f_bsize);
                  sfp->sf_blocks = txdr_unsigned(sf->f_blocks);
                  sfp->sf_bfree = txdr_unsigned(sf->f_bfree);
                  sfp->sf_bavail = txdr_unsigned(sf->f_bavail);
          }
  nfsmout:
          if (vp)
                  vput(vp);
          return(error);
  }
  
  /*
   * nfs fsinfo service
   */
  int
  nfsrv_fsinfo(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register u_int32_t *tl;
          register struct nfsv3_fsinfo *sip;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, rdonly, cache, getret = 1, pref;
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          struct vnode *vp = NULL;
          struct vattr at;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev, maxfsize;
          struct statfs sb;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          cache = 0;
  #endif
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (error) {
                  nfsm_reply(NFSX_UNSIGNED);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
  
          /* XXX Try to make a guess on the max file size. */
          VFS_STATFS(vp->v_mount, &sb, procp);
          maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1;
  
          getret = VOP_GETATTR(vp, &at, cred, procp);
          vput(vp);
          vp = NULL;
          nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3FSINFO);
          nfsm_srvpostop_attr(getret, &at);
          nfsm_build(sip, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  
          /*
           * XXX
           * There should be file system VFS OP(s) to get this information.
           * For now, assume ufs.
           */
          if (slp->ns_so->so_type == SOCK_DGRAM)
                  pref = NFS_MAXDGRAMDATA;
          else
                  pref = NFS_MAXDATA;
          sip->fs_rtmax = txdr_unsigned(NFS_MAXDATA);
          sip->fs_rtpref = txdr_unsigned(pref);
          sip->fs_rtmult = txdr_unsigned(NFS_FABLKSIZE);
          sip->fs_wtmax = txdr_unsigned(NFS_MAXDATA);
          sip->fs_wtpref = txdr_unsigned(pref);
          sip->fs_wtmult = txdr_unsigned(NFS_FABLKSIZE);
          sip->fs_dtpref = txdr_unsigned(pref);
          txdr_hyper(&maxfsize, &sip->fs_maxfilesize);
          sip->fs_timedelta.nfsv3_sec = 0;
          sip->fs_timedelta.nfsv3_nsec = txdr_unsigned(1);
          sip->fs_properties = txdr_unsigned(NFSV3FSINFO_LINK |
                  NFSV3FSINFO_SYMLINK | NFSV3FSINFO_HOMOGENEOUS |
                  NFSV3FSINFO_CANSETTIME);
  nfsmout:
          if (vp)
                  vput(vp);
          return(error);
  }
  
  /*
   * nfs pathconf service
   */
  int
  nfsrv_pathconf(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
          struct sockaddr *nam = nfsd->nd_nam;
          caddr_t dpos = nfsd->nd_dpos;
          struct ucred *cred = &nfsd->nd_cr;
          register u_int32_t *tl;
          register struct nfsv3_pathconf *pc;
          register int32_t t1;
          caddr_t bpos;
          int error = 0, rdonly, cache, getret = 1;
          register_t linkmax, namemax, chownres, notrunc;
          char *cp2;
          struct mbuf *mb, *mb2, *mreq;
          struct vnode *vp = NULL;
          struct vattr at;
          nfsfh_t nfh;
          fhandle_t *fhp;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          cache = 0;
  #endif
          fhp = &nfh.fh_generic;
          nfsm_srvmtofh(fhp);
          error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
                   &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
          if (error) {
                  nfsm_reply(NFSX_UNSIGNED);
                  nfsm_srvpostop_attr(getret, &at);
                  error = 0;
                  goto nfsmout;
          }
          error = VOP_PATHCONF(vp, _PC_LINK_MAX, &linkmax);
          if (!error)
                  error = VOP_PATHCONF(vp, _PC_NAME_MAX, &namemax);
          if (!error)
                  error = VOP_PATHCONF(vp, _PC_CHOWN_RESTRICTED, &chownres);
          if (!error)
                  error = VOP_PATHCONF(vp, _PC_NO_TRUNC, &notrunc);
          getret = VOP_GETATTR(vp, &at, cred, procp);
          vput(vp);
          vp = NULL;
          nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3PATHCONF);
          nfsm_srvpostop_attr(getret, &at);
          if (error) {
                  error = 0;
                  goto nfsmout;
          }
          nfsm_build(pc, struct nfsv3_pathconf *, NFSX_V3PATHCONF);
  
          pc->pc_linkmax = txdr_unsigned(linkmax);
          pc->pc_namemax = txdr_unsigned(namemax);
          pc->pc_notrunc = txdr_unsigned(notrunc);
          pc->pc_chownrestricted = txdr_unsigned(chownres);
  
          /*
           * These should probably be supported by VOP_PATHCONF(), but
           * until msdosfs is exportable (why would you want to?), the
           * Unix defaults should be ok.
           */
          pc->pc_caseinsensitive = nfs_false;
          pc->pc_casepreserving = nfs_true;
  nfsmout:
          if (vp) 
                  vput(vp);
          return(error);
  }
  
  /*
   * Null operation, used by clients to ping server
   */
  /* ARGSUSED */
  int
  nfsrv_null(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep;
          caddr_t bpos;
          int error = NFSERR_RETVOID, cache;
          struct mbuf *mb, *mreq;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          cache = 0;
  #endif
          nfsm_reply(0);
          nfsm_srvdone;
  }
  
  /*
   * No operation, used for obsolete procedures
   */
  /* ARGSUSED */
  int
  nfsrv_noop(nfsd, slp, procp, mrq)
          struct nfsrv_descript *nfsd;
          struct nfssvc_sock *slp;
          struct proc *procp;
          struct mbuf **mrq;
  {
          struct mbuf *mrep = nfsd->nd_mrep;
          caddr_t bpos;
          int error, cache;
          struct mbuf *mb, *mreq;
          u_quad_t frev;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
  #ifndef nolint
          cache = 0;
  #endif
          if (nfsd->nd_repstat)
                  error = nfsd->nd_repstat;
          else
                  error = EPROCUNAVAIL;
          nfsm_reply(0);
          nfsm_srvdone;
  }
  
  /*
   * Perform access checking for vnodes obtained from file handles that would
   * refer to files already opened by a Unix client. You cannot just use
   * vn_writechk() and VOP_ACCESS() for two reasons.
   * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write case
   * 2 - The owner is to be given access irrespective of mode bits for some
   *     operations, so that processes that chmod after opening a file don't
   *     break. I don't like this because it opens a security hole, but since
   *     the nfs server opens a security hole the size of a barn door anyhow,
   *     what the heck.
   *
   * The exception to rule 2 is EPERM. If a file is IMMUTABLE, VOP_ACCESS()
   * will return EPERM instead of EACCESS. EPERM is always an error.
   */
  static int
  nfsrv_access(vp, flags, cred, rdonly, p, override)
          register struct vnode *vp;
          int flags;
          register struct ucred *cred;
          int rdonly;
          struct proc *p;
          int override;
  {
          struct vattr vattr;
          int error;
  
          nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
          if (flags & VWRITE) {
                  /* Just vn_writechk() changed to check rdonly */
                  /*
                   * Disallow write attempts on read-only file systems;
                   * unless the file is a socket or a block or character
                   * device resident on the file system.
                   */
                  if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) {
                          switch (vp->v_type) {
                          case VREG:
                          case VDIR:
                          case VLNK:
                                  return (EROFS);
                          default:
                                  break;
                          }
                  }
                  /*
                   * If there's shared text associated with
                   * the inode, we can't allow writing.
                   */
                  if (vp->v_flag & VTEXT)
                          return (ETXTBSY);
          }
          error = VOP_GETATTR(vp, &vattr, cred, p);
          if (error)
                  return (error);
          error = VOP_ACCESS(vp, flags, cred, p);
          /*
           * Allow certain operations for the owner (reads and writes
           * on files that are already open).
           */
          if (override && error == EACCES && cred->cr_uid == vattr.va_uid)
                  error = 0;
          return error;
  }
  #endif /* NFS_NOSERVER */