/*
 * 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. 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: src/sys/nfs/nfs_serv.c,v 1.93.2.6 2002/12/29 18:19:53 dillon Exp $
 */

/*
 * 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.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/caps.h>
#include <sys/nlookup.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 <sys/buf.h>

#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>

#include <sys/buf2.h>

#include <sys/thread2.h>

#include "nfsproto.h"
#include "rpcv2.h"
#include "nfs.h"
#include "xdr_subs.h"
#include "nfsm_subs.h"

#ifdef NFSRV_DEBUG
#define nfsdbprintf(info)       kprintf info
#else
#define nfsdbprintf(info)
#endif

#define MAX_REORDERED_RPC       (16)
#define MAX_COMMIT_COUNT        (1024 * 1024)

#define NUM_HEURISTIC           1031
#define NHUSE_INIT              64
#define NHUSE_INC               16
#define NHUSE_MAX               2048

static struct nfsheur {
    struct vnode *nh_vp;        /* vp to match (unreferenced pointer) */
    off_t nh_nextoff;           /* next offset for sequential detection */
    int nh_use;                 /* use count for selection */
    int nh_seqcount;            /* heuristic */
} nfsheur[NUM_HEURISTIC];

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 };

int nfsrvw_procrastinate = NFS_GATHERDELAY * 1000;
int nfsrvw_procrastinate_v3 = 0;

static struct timespec  nfsver;

SYSCTL_DECL(_vfs_nfs);

int nfs_async;
SYSCTL_INT(_vfs_nfs, OID_AUTO, async, CTLFLAG_RW, &nfs_async, 0,
    "Enable unstable and fast writes");
static int nfs_commit_blks;
static int nfs_commit_miss;
SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks, 0,
    "Number of committed blocks");
SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss, 0,
    "Number of nfs blocks committed from dirty buffers");

static int nfsrv_access (struct mount *, struct vnode *, int,
                        struct ucred *, int, struct thread *, int);
static void nfsrvw_coalesce (struct nfsrv_descript *,
                struct nfsrv_descript *);

/*
 * Heuristic to detect sequential operation.
 */
static struct nfsheur *
nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp, int writeop)
{
        struct nfsheur *nh;
        int hi, try;

        /* Locate best candidate */
        try = 32;
        hi = ((int)(vm_offset_t) vp / sizeof(struct vnode)) % NUM_HEURISTIC;
        nh = &nfsheur[hi];

        while (try--) {
                if (nfsheur[hi].nh_vp == vp) {
                        nh = &nfsheur[hi];
                        break;
                }
                if (nfsheur[hi].nh_use > 0)
                        --nfsheur[hi].nh_use;
                hi = (hi + 1) % NUM_HEURISTIC;
                if (nfsheur[hi].nh_use < nh->nh_use)
                        nh = &nfsheur[hi];
        }

        /* Initialize hint if this is a new file */
        if (nh->nh_vp != vp) {
                nh->nh_vp = vp;
                nh->nh_nextoff = uio->uio_offset;
                nh->nh_use = NHUSE_INIT;
                if (uio->uio_offset == 0)
                        nh->nh_seqcount = 4;
                else
                        nh->nh_seqcount = 1;
        }

        /*
         * Calculate heuristic
         *
         * See vfs_vnops.c:sequential_heuristic().
         */
        if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
            uio->uio_offset == nh->nh_nextoff) {
                nh->nh_seqcount += howmany(uio->uio_resid, 16384);
                if (nh->nh_seqcount > IO_SEQMAX)
                        nh->nh_seqcount = IO_SEQMAX;
        } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
                imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
                    /* Probably a reordered RPC, leave seqcount alone. */
        } else if (nh->nh_seqcount > 1) {
                nh->nh_seqcount /= 2;
        } else {
                nh->nh_seqcount = 0;
        }
        nh->nh_use += NHUSE_INC;
        if (nh->nh_use > NHUSE_MAX)
                nh->nh_use = NHUSE_MAX;
        return (nh);
}

/*
 * nfs v3 access service
 */
int
nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
              struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        nfsfh_t nfh;
        fhandle_t *fhp;
        int error = 0, rdonly, getret;
        struct vattr vattr, *vap = &vattr;
        u_long testmode, nfsmode;
        struct nfsm_info info;
        u_int32_t *tl;

        info.dpos = nfsd->nd_dpos;
        info.md = nfsd->nd_md;
        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED));
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam, &rdonly,
            (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, 1, NULL);
                error = 0;
                goto nfsmout;
        }
        nfsmode = fxdr_unsigned(u_int32_t, *tl);
        if ((nfsmode & NFSV3ACCESS_READ) &&
                nfsrv_access(mp, vp, VREAD, cred, rdonly, td, 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(mp, vp, VWRITE, cred, rdonly, td, 0))
                nfsmode &= ~testmode;
        if (vp->v_type == VDIR)
                testmode = NFSV3ACCESS_LOOKUP;
        else
                testmode = NFSV3ACCESS_EXECUTE;
        if ((nfsmode & testmode) &&
                nfsrv_access(mp, vp, VEXEC, cred, rdonly, td, 0))
                nfsmode &= ~testmode;
        getret = VOP_GETATTR(vp, vap);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_POSTOPATTR(1) + NFSX_UNSIGNED, &error));
        nfsm_srvpostop_attr(&info, nfsd, getret, vap);
        tl = nfsm_build(&info, NFSX_UNSIGNED);
        *tl = txdr_unsigned(nfsmode);
nfsmout:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs getattr service
 */
int
nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
              struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nfs_fattr *fp;
        struct vattr va;
        struct vattr *vap = &va;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        nfsfh_t nfh;
        fhandle_t *fhp;
        int error = 0, rdonly;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.mreq = NULL;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, 0, &error));
                error = 0;
                goto nfsmout;
        }
        error = VOP_GETATTR(vp, vap);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_FATTR(nfsd->nd_flag & ND_NFSV3), &error));
        if (error) {
                error = 0;
                goto nfsmout;
        }
        fp = nfsm_build(&info, NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
        nfsm_srvfattr(nfsd, vap, fp);
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs setattr service
 */
int
nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
              struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct vattr va, preat;
        struct vattr *vap = &va;
        struct nfsv2_sattr *sp;
        struct nfs_fattr *fp;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        nfsfh_t nfh;
        fhandle_t *fhp;
        u_int32_t *tl;
        int error = 0, rdonly, preat_ret = 1, postat_ret = 1;
        int gcheck = 0;
        struct timespec guard;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        guard.tv_sec = 0;       /* fix compiler warning */
        guard.tv_nsec = 0;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        VATTR_NULL(vap);
        if (info.v3) {
                ERROROUT(nfsm_srvsattr(&info, vap));
                NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED));
                gcheck = fxdr_unsigned(int, *tl);
                if (gcheck) {
                        NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
                        fxdr_nfsv3time(tl, &guard);
                }
        } else {
                NULLOUT(sp = nfsm_dissect(&info, 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, &mp, &vp, cred, slp, nam, &rdonly,
                (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_UNSIGNED, &error));
                nfsm_srvwcc_data(&info, nfsd, preat_ret, &preat,
                                 postat_ret, vap);
                error = 0;
                goto nfsmout;
        }

        /*
         * vp now an active resource, pay careful attention to cleanup
         */

        if (info.v3) {
                error = preat_ret = VOP_GETATTR(vp, &preat);
                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;
                        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                              NFSX_WCCDATA(info.v3), &error));
                        nfsm_srvwcc_data(&info, nfsd, 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 || (mp->mnt_flag & MNT_RDONLY)) {
                        error = EROFS;
                        goto out;
                }
        } else {
                if (vp->v_type == VDIR) {
                        error = EISDIR;
                        goto out;
                } else if ((error = nfsrv_access(mp, vp, VWRITE, cred, rdonly,
                            td, 0)) != 0){ 
                        goto out;
                }
        }
        error = VOP_SETATTR(vp, vap, cred);
        postat_ret = VOP_GETATTR(vp, vap);
        if (!error)
                error = postat_ret;
out:
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                   NFSX_WCCORFATTR(info.v3), &error));
        if (info.v3) {
                nfsm_srvwcc_data(&info, nfsd, preat_ret, &preat,
                                 postat_ret, vap);
                error = 0;
                goto nfsmout;
        }
        fp = nfsm_build(&info, NFSX_V2FATTR);
        nfsm_srvfattr(nfsd, vap, fp);
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs lookup rpc
 */
int
nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nfs_fattr *fp;
        struct nlookupdata nd;
        struct vnode *vp;
        struct vnode *dirp;
        struct nchandle nch;
        nfsfh_t nfh;
        fhandle_t *fhp;
        int error = 0, len, dirattr_ret = 1;
        int pubflag;
        struct vattr va, dirattr, *vap = &va;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        vp = NULL;

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        pubflag = nfs_ispublicfh(fhp);

        error = nfs_namei(&nd, cred, 0, NULL, &vp,
                fhp, len, slp, nam, &info.md, &info.dpos,
                &dirp, td, (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 (info.v3)
                                dirattr_ret = VOP_GETATTR(dirp, &dirattr);
                        vrele(dirp);
                        dirp = NULL;
                }
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_POSTOPATTR(info.v3), &error));
                nfsm_srvpostop_attr(&info, nfsd, 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 (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!
                         */
                        vn_unlock(vp);
                        cache_copy(&nd.nl_nch, &nch);
                        nlookup_done(&nd);
                        error = nlookup_init_raw(&nd, nfs_pub.np_index,
                                                UIO_SYSSPACE, 0, cred, &nch);
                        cache_drop(&nch);
                        if (error == 0)
                                error = nlookup(&nd);

                        if (error == 0) {
                                /*
                                 * Found an index file. Get rid of
                                 * the old references.  transfer vp and
                                 * load up the new vp.  Fortunately we do
                                 * not have to deal with dvp, that would be
                                 * a huge mess.
                                 */
                                if (dirp)       
                                        vrele(dirp);
                                dirp = vp;
                                vp = NULL;
                                error = cache_vget(&nd.nl_nch, nd.nl_cred,
                                                        LK_EXCLUSIVE, &vp);
                                KKASSERT(error == 0);
                        }
                        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 (vp->v_mount != nfs_pub.np_mount) {
                        vput(vp);
                        vp = NULL;
                        error = EPERM;
                }
        }

        if (dirp) {
                if (info.v3)
                        dirattr_ret = VOP_GETATTR(dirp, &dirattr);
                vrele(dirp);
                dirp = NULL;
        }

        /*
         * Resources at this point:
         *      ndp->ni_vp      may not be NULL
         *
         */

        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_POSTOPATTR(info.v3), &error));
                nfsm_srvpostop_attr(&info, nfsd, dirattr_ret, &dirattr);
                error = 0;
                goto nfsmout;
        }

        /*
         * Clear out some resources prior to potentially blocking.  This
         * is not as critical as ni_dvp resources in other routines, but
         * it helps.
         */
        nlookup_done(&nd);

        /*
         * Get underlying attribute, then release remaining resources ( for
         * the same potential blocking reason ) and reply.
         */
        bzero(&fhp->fh_fid, sizeof(fhp->fh_fid));
        error = VFS_VPTOFH(vp, &fhp->fh_fid);
        if (!error)
                error = VOP_GETATTR(vp, vap);

        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_SRVFH(info.v3) +
                              NFSX_POSTOPORFATTR(info.v3) +
                              NFSX_POSTOPATTR(info.v3),
                              &error));
        if (error) {
                nfsm_srvpostop_attr(&info, nfsd, dirattr_ret, &dirattr);
                error = 0;
                goto nfsmout;
        }
        nfsm_srvfhtom(&info, fhp);
        if (info.v3) {
                nfsm_srvpostop_attr(&info, nfsd, 0, vap);
                nfsm_srvpostop_attr(&info, nfsd, dirattr_ret, &dirattr);
        } else {
                fp = nfsm_build(&info, NFSX_V2FATTR);
                nfsm_srvfattr(nfsd, vap, fp);
        }

nfsmout:
        *mrq = info.mreq;
        if (dirp)
                vrele(dirp);
        nlookup_done(&nd);              /* may be called twice */
        if (vp)
                vput(vp);
        return (error);
}

/*
 * nfs readlink service
 */
int
nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
               struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
        struct iovec *ivp = iv;
        u_int32_t *tl;
        int error = 0, rdonly, i, tlen, len, getret;
        struct mbuf *mp1, *mp2, *mp3;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        struct vattr attr;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct uio io, *uiop = &io;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        bzero(&io, sizeof(struct uio));

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
#ifndef nolint
        mp2 = NULL;
#endif
        mp3 = NULL;
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        len = 0;
        i = 0;
        while (len < NFS_MAXPATHLEN) {
                mp1 = m_getcl(M_WAITOK, MT_DATA, 0);
                mp1->m_len = MCLBYTES;
                if (len == 0)
                        mp3 = mp2 = mp1;
                else {
                        mp2->m_next = mp1;
                        mp2 = mp1;
                }
                if ((len + mp1->m_len) > NFS_MAXPATHLEN) {
                        mp1->m_len = NFS_MAXPATHLEN-len;
                        len = NFS_MAXPATHLEN;
                } else
                        len += mp1->m_len;
                ivp->iov_base = mtod(mp1, caddr_t);
                ivp->iov_len = mp1->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_td = NULL;
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, 1, NULL);
                error = 0;
                goto nfsmout;
        }
        if (vp->v_type != VLNK) {
                if (info.v3)
                        error = EINVAL;
                else
                        error = ENXIO;
                goto out;
        }
        error = VOP_READLINK(vp, uiop, cred);
out:
        getret = VOP_GETATTR(vp, &attr);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                             NFSX_POSTOPATTR(info.v3) + NFSX_UNSIGNED,
                             &error));
        if (info.v3) {
                nfsm_srvpostop_attr(&info, nfsd, 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);
        }
        tl = nfsm_build(&info, NFSX_UNSIGNED);
        *tl = txdr_unsigned(len);
        info.mb->m_next = mp3;
        mp3 = NULL;
nfsmout:
        *mrq = info.mreq;
        if (mp3)
                m_freem(mp3);
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs read service
 */
int
nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
           struct thread *td, struct mbuf **mrq)
{
        struct nfsm_info info;
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct iovec *iv;
        struct iovec *iv2;
        struct mbuf *m;
        struct nfs_fattr *fp;
        u_int32_t *tl;
        int i;
        int reqlen;
        int error = 0, rdonly, cnt, len, left, siz, tlen, getret;
        struct mbuf *m2;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct uio io, *uiop = &io;
        struct vattr va, *vap = &va;
        struct nfsheur *nh;
        off_t off;
        int ioflag = 0;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        if (info.v3) {
                NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
                off = fxdr_hyper(tl);
        } else {
                NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED));
                off = (off_t)fxdr_unsigned(u_int32_t, *tl);
        }
        NEGREPLYOUT(reqlen = nfsm_srvstrsiz(&info,
                                            NFS_SRVMAXDATA(nfsd), &error));

        /*
         * 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, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                vp = NULL;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, 1, NULL);
                error = 0;
                goto nfsmout;
        }

        if (vp->v_type != VREG) {
                if (info.v3)
                        error = EINVAL;
                else
                        error = (vp->v_type == VDIR) ? EISDIR : EACCES;
        }
        if (!error) {
            if ((error = nfsrv_access(mp, vp, VREAD, cred, rdonly, td, 1)) != 0)
                error = nfsrv_access(mp, vp, VEXEC, cred, rdonly, td, 1);
        }
        getret = VOP_GETATTR(vp, vap);
        if (!error)
                error = getret;
        if (error) {
                vput(vp);
                vp = NULL;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_POSTOPATTR(info.v3), &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, vap);
                error = 0;
                goto nfsmout;
        }

        /*
         * Calculate byte count to read
         */

        if (off >= vap->va_size)
                cnt = 0;
        else if ((off + reqlen) > vap->va_size)
                cnt = vap->va_size - off;
        else
                cnt = reqlen;

        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_POSTOPORFATTR(info.v3) +
                              3 * NFSX_UNSIGNED + nfsm_rndup(cnt),
                              &error));
        if (info.v3) {
                tl = nfsm_build(&info, NFSX_V3FATTR + 4 * NFSX_UNSIGNED);
                *tl++ = nfs_true;
                fp = (struct nfs_fattr *)tl;
                tl += (NFSX_V3FATTR / sizeof (u_int32_t));
        } else {
                tl = nfsm_build(&info, 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 = info.mb;
                while (left > 0) {
                        siz = min(M_TRAILINGSPACE(m), left);
                        if (siz > 0) {
                                left -= siz;
                                i++;
                        }
                        if (left > 0) {
                                m = m_getcl(M_WAITOK, MT_DATA, 0);
                                m->m_len = 0;
                                m2->m_next = m;
                                m2 = m;
                        }
                }
                iv = kmalloc(i * sizeof(struct iovec), M_TEMP, M_WAITOK);
                uiop->uio_iov = iv2 = iv;
                m = info.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;
                nh = nfsrv_sequential_heuristic(uiop, vp, 0);
                ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
                error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
                if (error == 0) {
                        off = uiop->uio_offset;
                        nh->nh_nextoff = off;
                }
                kfree((caddr_t)iv2, M_TEMP);
                if (error || (getret = VOP_GETATTR(vp, vap))) {
                        if (!error)
                                error = getret;
                        m_freem(info.mreq);
                        info.mreq = NULL;
                        vput(vp);
                        vp = NULL;
                        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                              NFSX_POSTOPATTR(info.v3),
                                              &error));
                        nfsm_srvpostop_attr(&info, nfsd, getret, vap);
                        error = 0;
                        goto nfsmout;
                }
        } else {
                uiop->uio_resid = 0;
        }
        vput(vp);
        vp = NULL;
        nfsm_srvfattr(nfsd, vap, fp);
        tlen = len - uiop->uio_resid;
        cnt = cnt < tlen ? cnt : tlen;
        tlen = nfsm_rndup(cnt);
        if (len != tlen || tlen != cnt)
                nfsm_adj(info.mb, len - tlen, tlen - cnt);
        if (info.v3) {
                *tl++ = txdr_unsigned(cnt);
                if (cnt < reqlen)
                        *tl++ = nfs_true;
                else
                        *tl++ = nfs_false;
        }
        *tl = txdr_unsigned(cnt);
nfsmout:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs write service
 */
int
nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
            struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct iovec *ivp;
        int i, cnt;
        struct mbuf *mp1;
        struct nfs_fattr *fp;
        struct iovec *iv;
        struct vattr va, forat;
        struct vattr *vap = &va;
        u_int32_t *tl;
        int error = 0, rdonly, len, forat_ret = 1;
        int ioflags, aftat_ret = 1, retlen, zeroing, adjust;
        int stable = NFSV3WRITE_FILESYNC;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        struct nfsheur *nh;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct uio io, *uiop = &io;
        struct nfsm_info info;
        off_t off;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        if (info.mrep == NULL) {
                error = 0;
                goto nfsmout;
        }
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        if (info.v3) {
                NULLOUT(tl = nfsm_dissect(&info, 5 * NFSX_UNSIGNED));
                off = fxdr_hyper(tl);
                tl += 3;
                stable = fxdr_unsigned(int, *tl++);
        } else {
                NULLOUT(tl = nfsm_dissect(&info, 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;
            mp1 = info.mrep;
            while (mp1) {
                if (mp1 == info.md) {
                        zeroing = 0;
                        adjust = info.dpos - mtod(mp1, caddr_t);
                        mp1->m_len -= adjust;
                        if (mp1->m_len > 0 && adjust > 0)
                                mp1->m_data += adjust;
                }
                if (zeroing)
                        mp1->m_len = 0;
                else if (mp1->m_len > 0) {
                        i += mp1->m_len;
                        if (i > len) {
                                mp1->m_len -= (i - len);
                                zeroing = 1;
                        }
                        if (mp1->m_len > 0)
                                cnt++;
                }
                mp1 = mp1->m_next;
            }
        }
        if (len > NFS_MAXDATA || len < 0 || i < len) {
                error = EIO;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_UNSIGNED, &error));
                nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                 aftat_ret, vap);
                error = 0;
                goto nfsmout;
        }
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                vp = NULL;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_UNSIGNED, &error));
                nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                 aftat_ret, vap);
                error = 0;
                goto nfsmout;
        }
        if (info.v3)
                forat_ret = VOP_GETATTR(vp, &forat);
        if (vp->v_type != VREG) {
                if (info.v3)
                        error = EINVAL;
                else
                        error = (vp->v_type == VDIR) ? EISDIR : EACCES;
        }
        if (!error) {
                error = nfsrv_access(mp, vp, VWRITE, cred, rdonly, td, 1);
        }
        if (error) {
                vput(vp);
                vp = NULL;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_WCCDATA(info.v3), &error));
                nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                 aftat_ret, vap);
                error = 0;
                goto nfsmout;
        }

        if (len > 0) {
            ivp = kmalloc(cnt * sizeof(struct iovec), M_TEMP, M_WAITOK);
            uiop->uio_iov = iv = ivp;
            uiop->uio_iovcnt = cnt;
            mp1 = info.mrep;
            while (mp1) {
                if (mp1->m_len > 0) {
                        ivp->iov_base = mtod(mp1, caddr_t);
                        ivp->iov_len = mp1->m_len;
                        ivp++;
                }
                mp1 = mp1->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_td = NULL;
            uiop->uio_offset = off;
            nh = nfsrv_sequential_heuristic(uiop, vp, 1);
            ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
            error = VOP_WRITE(vp, uiop, ioflags, cred);
            if (error == 0)
                nh->nh_nextoff = uiop->uio_offset;
            nfsstats.srvvop_writes++;
            kfree((caddr_t)iv, M_TEMP);
        }
        aftat_ret = VOP_GETATTR(vp, vap);
        vput(vp);
        vp = NULL;
        if (!error)
                error = aftat_ret;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_PREOPATTR(info.v3) +
                              NFSX_POSTOPORFATTR(info.v3) +
                              2 * NFSX_UNSIGNED + NFSX_WRITEVERF(info.v3),
                              &error));
        if (info.v3) {
                nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                 aftat_ret, vap);
                if (error) {
                        error = 0;
                        goto nfsmout;
                }
                tl = nfsm_build(&info, 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_nsec / 1000);
        } else {
                fp = nfsm_build(&info, NFSX_V2FATTR);
                nfsm_srvfattr(nfsd, vap, fp);
        }
nfsmout:
        *mrq = info.mreq;
        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(struct nfsrv_descript **ndp, struct nfssvc_sock *slp,
                  struct thread *td, struct mbuf **mrq)
{
        struct iovec *ivp;
        struct nfsrv_descript *wp, *nfsd, *owp, *swp;
        struct nfs_fattr *fp;
        int i;
        struct iovec *iov;
        struct nfsrvw_delayhash *wpp;
        struct ucred *cred;
        struct vattr va, forat;
        u_int32_t *tl;
        int error = 0, rdonly, len, forat_ret = 1;
        int ioflags, aftat_ret = 1, adjust, zeroing;
        struct mbuf *mp1;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        struct uio io, *uiop = &io;
        u_quad_t cur_usec;
        struct nfsm_info info;

        info.mreq = NULL;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
#ifndef nolint
        i = 0;
        len = 0;
#endif
        if (*ndp) {
            nfsd = *ndp;
            *ndp = NULL;
            info.mrep = nfsd->nd_mrep;
            info.mreq = NULL;
            info.md = nfsd->nd_md;
            info.dpos = nfsd->nd_dpos;
            info.v3 = (nfsd->nd_flag & ND_NFSV3);
            cred = &nfsd->nd_cr;
            LIST_INIT(&nfsd->nd_coalesce);
            nfsd->nd_mreq = NULL;
            nfsd->nd_stable = NFSV3WRITE_FILESYNC;
            cur_usec = nfs_curusec();
            nfsd->nd_time = cur_usec +
                (info.v3 ? nfsrvw_procrastinate_v3 : nfsrvw_procrastinate);
    
            /*
             * Now, get the write header..
             */
            NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, &nfsd->nd_fh, &error));
            if (info.v3) {
                NULLOUT(tl = nfsm_dissect(&info, 5 * NFSX_UNSIGNED));
                nfsd->nd_off = fxdr_hyper(tl);
                tl += 3;
                nfsd->nd_stable = fxdr_unsigned(int, *tl++);
            } else {
                NULLOUT(tl = nfsm_dissect(&info, 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;
            mp1 = info.mrep;
            while (mp1) {
                if (mp1 == info.md) {
                    zeroing = 0;
                    adjust = info.dpos - mtod(mp1, caddr_t);
                    mp1->m_len -= adjust;
                    if (mp1->m_len > 0 && adjust > 0)
                        mp1->m_data += adjust;
                }
                if (zeroing)
                    mp1->m_len = 0;
                else {
                    i += mp1->m_len;
                    if (i > len) {
                        mp1->m_len -= (i - len);
                        zeroing = 1;
                    }
                }
                mp1 = mp1->m_next;
            }
            if (len > NFS_MAXDATA || len < 0  || i < len) {
nfsmout:
                m_freem(info.mrep);
                info.mrep = NULL;
                error = EIO;
                nfsm_writereply(&info, nfsd, slp, error, 2 * NFSX_UNSIGNED);
                if (info.v3) {
                    nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                     aftat_ret, &va);
                }
                nfsd->nd_mreq = info.mreq;
                nfsd->nd_mrep = NULL;
                nfsd->nd_time = 0;
            }
    
            /*
             * Add this entry to the hash and time queues.
             */
            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);
                }
            }
        }
    
        /*
         * 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();
        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);
                info.mrep = nfsd->nd_mrep;
                info.mreq = NULL;
                info.v3 = (nfsd->nd_flag & ND_NFSV3);
                nfsd->nd_mrep = NULL;
                cred = &nfsd->nd_cr;
                forat_ret = aftat_ret = 1;
                error = nfsrv_fhtovp(&nfsd->nd_fh, 1, &mp, &vp, cred, slp, 
                                     nfsd->nd_nam, &rdonly,
                                     (nfsd->nd_flag & ND_KERBAUTH), TRUE);
                if (!error) {
                    if (info.v3)
                        forat_ret = VOP_GETATTR(vp, &forat);
                    if (vp->v_type != VREG) {
                        if (info.v3)
                            error = EINVAL;
                        else
                            error = (vp->v_type == VDIR) ? EISDIR : EACCES;
                    }
                } else {
                    vp = NULL;
                }
                if (!error) {
                    error = nfsrv_access(mp, vp, VWRITE, cred, rdonly, td, 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_td = NULL;
                uiop->uio_offset = nfsd->nd_off;
                uiop->uio_resid = nfsd->nd_eoff - nfsd->nd_off;
                if (uiop->uio_resid > 0) {
                    mp1 = info.mrep;
                    i = 0;
                    while (mp1) {
                        if (mp1->m_len > 0)
                            i++;
                        mp1 = mp1->m_next;
                    }
                    uiop->uio_iovcnt = i;
                    iov = kmalloc(i * sizeof(struct iovec), M_TEMP, M_WAITOK);
                    uiop->uio_iov = ivp = iov;
                    mp1 = info.mrep;
                    while (mp1) {
                        if (mp1->m_len > 0) {
                            ivp->iov_base = mtod(mp1, caddr_t);
                            ivp->iov_len = mp1->m_len;
                            ivp++;
                        }
                        mp1 = mp1->m_next;
                    }
                    if (!error) {
                        error = VOP_WRITE(vp, uiop, ioflags, cred);
                        nfsstats.srvvop_writes++;
                    }
                    kfree((caddr_t)iov, M_TEMP);
                }
                m_freem(info.mrep);
                info.mrep = NULL;
                if (vp) {
                    aftat_ret = VOP_GETATTR(vp, &va);
                    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(&info, nfsd, slp, error,
                                        NFSX_WCCDATA(info.v3));
                        if (info.v3) {
                            nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                             aftat_ret, &va);
                        }
                    } else {
                        nfsm_writereply(&info, nfsd, slp, error,
                                        NFSX_PREOPATTR(info.v3) +
                                        NFSX_POSTOPORFATTR(info.v3) +
                                        2 * NFSX_UNSIGNED +
                                        NFSX_WRITEVERF(info.v3));
                        if (info.v3) {
                            nfsm_srvwcc_data(&info, nfsd, forat_ret, &forat,
                                             aftat_ret, &va);
                            tl = nfsm_build(&info, 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_nsec / 1000);
                        } else {
                            fp = nfsm_build(&info, NFSX_V2FATTR);
                            nfsm_srvfattr(nfsd, &va, fp);
                        }
                    }
                    nfsd->nd_mreq = info.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.
                     */
                    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);
                    }
                } while (nfsd);
                swp->nd_time = 0;
                LIST_INSERT_HEAD(&slp->ns_tq, swp, nd_tq);
                goto loop1;
        }

        /*
         * Search for a reply to return.
         */
        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);
                    break;
                }
        }
        if (nfsd) {
                *ndp = nfsd;
                *mrq = nfsd->nd_mreq;
        } else {
                *ndp = NULL;
                *mrq = NULL;
        }
        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(struct nfsrv_descript *owp, struct nfsrv_descript *nfsd)
{
        int overlap;
        struct mbuf *mp1;
        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);
            mp1 = owp->nd_mrep;
            while (mp1->m_next)
                mp1 = mp1->m_next;
            mp1->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(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nfs_fattr *fp;
        struct vattr va, dirfor, diraft;
        struct vattr *vap = &va;
        struct nfsv2_sattr *sp;
        u_int32_t *tl;
        struct nlookupdata nd;
        int error = 0, len, tsize, dirfor_ret = 1, diraft_ret = 1;
        dev_t rdev = NOUDEV;
        caddr_t cp;
        int how, exclusive_flag = 0;
        struct vnode *dirp;
        struct vnode *dvp;
        struct vnode *vp;
        struct mount *mp = NULL;
        nfsfh_t nfh;
        fhandle_t *fhp;
        u_quad_t tempsize;
        u_char cverf[NFSX_V3CREATEVERF];
        struct nfsm_info info;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        dvp = NULL;
        vp = NULL;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        /*
         * 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, cred, NLC_CREATE, &dvp, &vp,
                          fhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        mp = vfs_getvfs(&fhp->fh_fsid);

        if (dirp) {
                if (info.v3) {
                        dirfor_ret = VOP_GETATTR(dirp, &dirfor);
                } else {
                        vrele(dirp);
                        dirp = NULL;
                }
        }
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_WCCDATA(info.v3), &error));
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
                goto nfsmout;
        }

        /*
         * No error.  Continue.  State:
         *
         *      dirp            may be valid
         *      vp              may be valid or NULL if the target does not
         *                      exist.
         *      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 (info.v3) {
                NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED));
                how = fxdr_unsigned(int, *tl);
                switch (how) {
                case NFSV3CREATE_GUARDED:
                        if (vp) {
                                error = EEXIST;
                                break;
                        }
                        /* fall through */
                case NFSV3CREATE_UNCHECKED:
                        ERROROUT(nfsm_srvsattr(&info, vap));
                        break;
                case NFSV3CREATE_EXCLUSIVE:
                        NULLOUT(cp = nfsm_dissect(&info, NFSX_V3CREATEVERF));
                        bcopy(cp, cverf, NFSX_V3CREATEVERF);
                        exclusive_flag = 1;
                        break;
                }
                vap->va_type = VREG;
        } else {
                NULLOUT(sp = nfsm_dissect(&info, 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 (vp == NULL) {
                if (vap->va_mode == (mode_t)VNOVAL)
                        vap->va_mode = 0;
                if (vap->va_type == VREG || vap->va_type == VSOCK) {
                        vn_unlock(dvp);
                        error = VOP_NCREATE(&nd.nl_nch, dvp, &vp,
                                            nd.nl_cred, vap);
                        vrele(dvp);
                        dvp = NULL;
                        if (error == 0) {
                                if (exclusive_flag) {
                                        exclusive_flag = 0;
                                        VATTR_NULL(vap);
                                        bcopy(cverf, (caddr_t)&vap->va_atime,
                                                NFSX_V3CREATEVERF);
                                        error = VOP_SETATTR(vp, vap, cred);
                                }
                        }
                } 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 = caps_priv_check(cred,
                                                     SYSCAP_RESTRICTEDROOT)))
                        {
                                goto nfsmreply0;
                        }
                        vap->va_rmajor = umajor(rdev);
                        vap->va_rminor = uminor(rdev);

                        vn_unlock(dvp);
                        error = VOP_NMKNOD(&nd.nl_nch, dvp, &vp, nd.nl_cred, vap);
                        vrele(dvp);
                        dvp = NULL;
                        if (error)
                                goto nfsmreply0;
#if 0
                        /*
                         * XXX what is this junk supposed to do ?
                         */

                        vput(vp);
                        vp = NULL;

                        /*
                         * release dvp prior to lookup
                         */
                        vput(dvp);
                        dvp = NULL;

                        /*
                         * Setup for lookup. 
                         *
                         * Even though LOCKPARENT was cleared, ni_dvp may
                         * be garbage. 
                         */
                        nd.ni_cnd.cn_nameiop = NAMEI_LOOKUP;
                        nd.ni_cnd.cn_flags &= ~(CNP_LOCKPARENT);
                        nd.ni_cnd.cn_td = td;
                        nd.ni_cnd.cn_cred = cred;

                        error = lookup(&nd);
                        nd.ni_dvp = NULL;

                        if (error != 0) {
                                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                                      0, &error));
                                /* fall through on certain errors */
                        }
                        nfsrv_object_create(nd.ni_vp);
                        if (nd.ni_cnd.cn_flags & CNP_ISSYMLINK) {
                                error = EINVAL;
                                goto nfsmreply0;
                        }
#endif
                } else {
                        error = ENXIO;
                }
        } else {
                if (vap->va_size != -1) {
                        error = nfsrv_access(mp, vp, VWRITE, cred,
                            (nd.nl_flags & NLC_NFS_RDONLY), td, 0);
                        if (!error) {
                                tempsize = vap->va_size;
                                VATTR_NULL(vap);
                                vap->va_size = tempsize;
                                error = VOP_SETATTR(vp, vap, cred);
                        }
                }
        }

        if (!error) {
                bzero(&fhp->fh_fid, sizeof(fhp->fh_fid));
                error = VFS_VPTOFH(vp, &fhp->fh_fid);
                if (!error)
                        error = VOP_GETATTR(vp, vap);
        }
        if (info.v3) {
                if (exclusive_flag && !error &&
                        bcmp(cverf, (caddr_t)&vap->va_atime, NFSX_V3CREATEVERF))
                        error = EEXIST;
                diraft_ret = VOP_GETATTR(dirp, &diraft);
                vrele(dirp);
                dirp = NULL;
        }
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_SRVFH(info.v3) + NFSX_FATTR(info.v3) +
                              NFSX_WCCDATA(info.v3),
                              &error));
        if (info.v3) {
                if (!error) {
                        nfsm_srvpostop_fh(&info, fhp);
                        nfsm_srvpostop_attr(&info, nfsd, 0, vap);
                }
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
        } else {
                nfsm_srvfhtom(&info, fhp);
                fp = nfsm_build(&info, NFSX_V2FATTR);
                nfsm_srvfattr(nfsd, vap, fp);
        }
        goto nfsmout;

nfsmreply0:
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, 0, &error));
        error = 0;
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        if (dirp)
                vrele(dirp);
        nlookup_done(&nd);
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        if (vp)
                vput(vp);
        if (mp)
                mount_drop(mp);
        return (error);
}

/*
 * nfs v3 mknod service
 */
int
nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
            struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct vattr va, dirfor, diraft;
        struct vattr *vap = &va;
        u_int32_t *tl;
        struct nlookupdata nd;
        int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
        enum vtype vtyp;
        struct vnode *dirp;
        struct vnode *dvp;
        struct vnode *vp;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct nfsm_info info;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        dvp = NULL;
        vp = NULL;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        /*
         * 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, cred, NLC_CREATE, &dvp, &vp,
                          fhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (dirp)
                dirfor_ret = VOP_GETATTR(dirp, &dirfor);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                           NFSX_WCCDATA(1), &error));
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
                goto nfsmout;
        }
        NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED));
        vtyp = nfsv3tov_type(*tl);
        if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
                error = NFSERR_BADTYPE;
                goto out;
        }
        VATTR_NULL(vap);
        ERROROUT(nfsm_srvsattr(&info, vap));
        if (vtyp == VCHR || vtyp == VBLK) {
                NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
                vap->va_rmajor = fxdr_unsigned(u_int32_t, *tl++);
                vap->va_rminor = fxdr_unsigned(u_int32_t, *tl);
        }

        /*
         * Iff doesn't exist, create it.
         */
        if (vp) {
                error = EEXIST;
                goto out;
        }
        vap->va_type = vtyp;
        if (vap->va_mode == (mode_t)VNOVAL)
                vap->va_mode = 0;
        if (vtyp == VSOCK) {
                vn_unlock(dvp);
                error = VOP_NCREATE(&nd.nl_nch, dvp, &vp, nd.nl_cred, vap);
                vrele(dvp);
                dvp = NULL;
        } else {
                if (vtyp != VFIFO &&
                    (error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT)))
                {
                        goto out;
                }

                vn_unlock(dvp);
                error = VOP_NMKNOD(&nd.nl_nch, dvp, &vp, nd.nl_cred, vap);
                vrele(dvp);
                dvp = NULL;
                if (error)
                        goto out;
        }

        /*
         * send response, cleanup, return.
         */
out:
        nlookup_done(&nd);
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
                dvp = NULL;
        }
        if (!error) {
                bzero(&fhp->fh_fid, sizeof(fhp->fh_fid));
                error = VFS_VPTOFH(vp, &fhp->fh_fid);
                if (!error)
                        error = VOP_GETATTR(vp, vap);
        }
        if (vp) {
                vput(vp);
                vp = NULL;
        }
        diraft_ret = VOP_GETATTR(dirp, &diraft);
        if (dirp) {
                vrele(dirp);
                dirp = NULL;
        }
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_SRVFH(1) + NFSX_POSTOPATTR(1) +
                              NFSX_WCCDATA(1), &error));
        if (!error) {
                nfsm_srvpostop_fh(&info, fhp);
                nfsm_srvpostop_attr(&info, nfsd, 0, vap);
        }
        nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                         diraft_ret, &diraft);
        *mrq = info.mreq;
        return (0);
nfsmout:
        *mrq = info.mreq;
        if (dirp)
                vrele(dirp);
        nlookup_done(&nd);
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        if (vp)
                vput(vp);
        return (error);
}

/*
 * nfs remove service
 */
int
nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nlookupdata nd;
        int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
        struct vnode *dirp;
        struct vnode *dvp;
        struct vnode *vp;
        struct vattr dirfor, diraft;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct nfsm_info info;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        dvp = NULL;
        vp = NULL;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        error = nfs_namei(&nd, cred, NLC_DELETE, &dvp, &vp,
                          fhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (dirp) {
                if (info.v3)
                        dirfor_ret = VOP_GETATTR(dirp, &dirfor);
        }
        if (error == 0) {
                if (vp->v_type == VDIR) {
                        error = EPERM;          /* POSIX */
                        goto out;
                }
                /*
                 * The root of a mounted filesystem cannot be deleted.
                 */
                if (vp->v_flag & VROOT) {
                        error = EBUSY;
                        goto out;
                }
out:
                if (!error) {
                        if (dvp != vp)
                                vn_unlock(dvp);
                        if (vp) {
                                vput(vp);
                                vp = NULL;
                        }
                        error = VOP_NREMOVE(&nd.nl_nch, dvp, nd.nl_cred);
                        vrele(dvp);
                        dvp = NULL;
                }
        }
        if (dirp && info.v3)
                diraft_ret = VOP_GETATTR(dirp, &diraft);
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_WCCDATA(info.v3), &error));
        if (info.v3) {
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
        }
nfsmout:
        *mrq = info.mreq;
        nlookup_done(&nd);
        if (dirp)
                vrele(dirp);
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs rename service
 */
int
nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        int error = 0, len, len2, fdirfor_ret = 1, fdiraft_ret = 1;
        int tdirfor_ret = 1, tdiraft_ret = 1;
        struct nlookupdata fromnd, tond;
        struct nchandle fnchd;
        struct nchandle tnchd;
        struct vnode *fvp, *fdirp, *fdvp;
        struct vnode *tvp, *tdirp, *tdvp;
        struct namecache *ncp;
        struct vattr fdirfor, fdiraft, tdirfor, tdiraft;
        int fnchd_status = 0;
        int tnchd_status = 0;
        nfsfh_t fnfh, tnfh;
        fhandle_t *ffhp, *tfhp;
        uid_t saved_uid;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
#ifndef nolint
        fvp = NULL;
#endif
        ffhp = &fnfh.fh_generic;
        tfhp = &tnfh.fh_generic;

        /*
         * Clear fields incase goto nfsmout occurs from macro.
         */

        nlookup_zero(&fromnd);
        nlookup_zero(&tond);
        fdirp = NULL;
        tdirp = NULL;

        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, ffhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        /*
         * Remember our original uid so that we can reset cr_uid before
         * the second nfs_namei() call, in case it is remapped.
         *
         * NOTE! If nfs_namei() is called twice on the same nd, it assumes
         *       a retry and does not try to reparse the path.
         */
        saved_uid = cred->cr_uid;
again:
        error = nfs_namei(&fromnd, cred, NLC_RENAME_SRC,
                          NULL, NULL,
                          ffhp, len, slp, nam, &info.md, &info.dpos, &fdirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (fdirp) {
                if (info.v3)
                        fdirfor_ret = VOP_GETATTR(fdirp, &fdirfor);
        }
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_WCCDATA(info.v3), &error));
                nfsm_srvwcc_data(&info, nfsd, fdirfor_ret, &fdirfor,
                                 fdiraft_ret, &fdiraft);
                nfsm_srvwcc_data(&info, nfsd, tdirfor_ret, &tdirfor,
                                 tdiraft_ret, &tdiraft);
                error = 0;
                goto nfsmout;
        }

        fnchd.mount = fromnd.nl_nch.mount;
        fnchd.ncp = fromnd.nl_nch.ncp->nc_parent;
        if (fnchd.ncp == NULL) {
                error = ENOENT;
                goto nfsmout;
        }
        cache_hold(&fnchd);
        fnchd_status = 1;

        /*
         * We have to unlock the from ncp before we can safely lookup
         * the target ncp.
         */
        KKASSERT(fromnd.nl_flags & NLC_NCPISLOCKED);
        cache_unlock(&fromnd.nl_nch);
        fromnd.nl_flags &= ~NLC_NCPISLOCKED;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, tfhp, &error));
        NEGATIVEOUT(len2 = nfsm_strsiz(&info, NFS_MAXNAMLEN));
        cred->cr_uid = saved_uid;

        error = nfs_namei(&tond, cred, NLC_RENAME_DST, NULL, NULL,
                          tfhp, len2, slp, nam, &info.md, &info.dpos, &tdirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (tdirp) {
                if (info.v3)
                        tdirfor_ret = VOP_GETATTR(tdirp, &tdirfor);
        }
        if (error)
                goto out1;
        tnchd.mount = tond.nl_nch.mount;
        tnchd.ncp = tond.nl_nch.ncp->nc_parent;
        if (tnchd.ncp == NULL) {
                error = ENOENT;
                goto nfsmout;
        }
        cache_hold(&tnchd);
        tnchd_status = 1;

        cache_lock4_tondlocked(&fnchd, &fromnd.nl_nch,
                               &tnchd, &tond.nl_nch,
                               fromnd.nl_cred, tond.nl_cred);
        fromnd.nl_flags |= NLC_NCPISLOCKED;
        fnchd_status = 2;
        tnchd_status = 2;

        /*
         * Revalidate namecache records and retry the lookups if necessary.
         */
        if (fnchd.ncp != fromnd.nl_nch.ncp->nc_parent ||
            tnchd.ncp != tond.nl_nch.ncp->nc_parent ||
            (fromnd.nl_nch.ncp->nc_flag & (NCF_DESTROYED | NCF_UNRESOLVED)) ||
            fromnd.nl_nch.ncp->nc_vp == NULL ||
            (tond.nl_nch.ncp->nc_flag & (NCF_DESTROYED | NCF_UNRESOLVED))) {
                cache_put(&fnchd);
                cache_put(&tnchd);
                if (tdirp)
                        vrele(tdirp);
                if (fdirp)
                        vrele(fdirp);
                kprintf("nfs - retry rename %s to %s\n",
                        fromnd.nl_path, tond.nl_path);
                goto again;
        }

        /*
         * Source and target vnodes (tvp might be NULL)
         */
        fvp = fromnd.nl_nch.ncp->nc_vp;
        tvp = tond.nl_nch.ncp->nc_vp;

        /*
         * Set fdvp and tdvp.  We haven't done all the topology checks
         * so these can wind up NULL (e.g. if either fvp or tvp is a mount
         * point).  If we get through the checks these will be guarenteed
         * to be non-NULL.
         *
         * Holding the children ncp's should be sufficient to prevent
         * fdvp and tdvp ripouts.
         */
        fdvp = fromnd.nl_nch.ncp->nc_parent->nc_vp;
        tdvp = tond.nl_nch.ncp->nc_parent->nc_vp;

        if (tvp != NULL) {
                if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
                        if (info.v3)
                                error = EEXIST;
                        else
                                error = EISDIR;
                        goto out;
                } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
                        if (info.v3)
                                error = EEXIST;
                        else
                                error = ENOTDIR;
                        goto out;
                }
                if (tvp->v_type == VDIR && (tond.nl_nch.ncp->nc_flag & NCF_ISMOUNTPT)) {
                        if (info.v3)
                                error = EXDEV;
                        else
                                error = ENOTEMPTY;
                        goto out;
                }
        }
        if (fvp->v_type == VDIR && (fromnd.nl_nch.ncp->nc_flag & NCF_ISMOUNTPT)) {
                if (info.v3)
                        error = EXDEV;
                else
                        error = ENOTEMPTY;
                goto out;
        }
        if (fromnd.nl_nch.mount != tond.nl_nch.mount) {
                if (info.v3)
                        error = EXDEV;
                else
                        error = ENOTEMPTY;
                goto out;
        }
        if (fromnd.nl_nch.ncp == tond.nl_nch.ncp->nc_parent) {
                if (info.v3)
                        error = EINVAL;
                else
                        error = ENOTEMPTY;
        }

        /*
         * You cannot rename a source into itself or a subdirectory of itself.
         * We check this by travsering the target directory upwards looking
         * for a match against the source.
         */
        if (error == 0) {
                for (ncp = tond.nl_nch.ncp; ncp; ncp = ncp->nc_parent) {
                        if (fromnd.nl_nch.ncp == ncp) {
                                error = EINVAL;
                                break;
                        }
                }
        }

        /*
         * 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 (fromnd.nl_nch.ncp == tond.nl_nch.ncp)
                error = -1;
out:
        if (!error) {
                /*
                 * The VOP_NRENAME function releases all vnode references &
                 * locks prior to returning so we need to clear the pointers
                 * to bypass cleanup code later on.
                 */
                error = VOP_NRENAME(&fromnd.nl_nch, &tond.nl_nch,
                                    fdvp, tdvp, tond.nl_cred);
        } else {
                if (error == -1)
                        error = 0;
        }
        /* fall through */

out1:
        if (fdirp)
                fdiraft_ret = VOP_GETATTR(fdirp, &fdiraft);
        if (tdirp)
                tdiraft_ret = VOP_GETATTR(tdirp, &tdiraft);
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              2 * NFSX_WCCDATA(info.v3), &error));
        if (info.v3) {
                nfsm_srvwcc_data(&info, nfsd, fdirfor_ret, &fdirfor,
                                 fdiraft_ret, &fdiraft);
                nfsm_srvwcc_data(&info, nfsd, tdirfor_ret, &tdirfor,
                                 tdiraft_ret, &tdiraft);
        }
        error = 0;
        /* fall through */

nfsmout:
        if (fnchd_status > 1)
                cache_unlock(&fnchd);
        if (fnchd_status > 0)
                cache_drop(&fnchd);
        if (tnchd_status > 1)
                cache_unlock(&tnchd);
        if (tnchd_status > 0)
                cache_drop(&tnchd);

        *mrq = info.mreq;
        if (tdirp)
                vrele(tdirp);
        nlookup_done(&tond);
        if (fdirp)
                vrele(fdirp);
        nlookup_done(&fromnd);
        return (error);
}

/*
 * nfs link service
 */
int
nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
           struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nlookupdata nd;
        int error = 0, rdonly, len, dirfor_ret = 1, diraft_ret = 1;
        int getret = 1;
        struct vnode *dirp;
        struct vnode *dvp;
        struct vnode *vp;
        struct vnode *xp;
        struct mount *xmp;
        struct vattr dirfor, diraft, at;
        nfsfh_t nfh, dnfh;
        fhandle_t *fhp, *dfhp;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = dvp = vp = xp = NULL;
        xmp = NULL;

        fhp = &nfh.fh_generic;
        dfhp = &dnfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, dfhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        error = nfsrv_fhtovp(fhp, FALSE, &xmp, &xp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_POSTOPATTR(info.v3) +
                                      NFSX_WCCDATA(info.v3),
                                      &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                xp = NULL;
                error = 0;
                goto nfsmout;
        }
        if (xp->v_type == VDIR) {
                error = EPERM;          /* POSIX */
                goto out1;
        }

        error = nfs_namei(&nd, cred, NLC_CREATE, &dvp, &vp,
                          dfhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (dirp) {
                if (info.v3)
                        dirfor_ret = VOP_GETATTR(dirp, &dirfor);
        }
        if (error)
                goto out1;

        if (vp != NULL) {
                error = EEXIST;
                goto out;
        }
        if (xp->v_mount != dvp->v_mount)
                error = EXDEV;
out:
        if (!error) {
                vn_unlock(dvp);
                error = VOP_NLINK(&nd.nl_nch, dvp, xp, nd.nl_cred);
                vrele(dvp);
                dvp = NULL;
        }
        /* fall through */

out1:
        if (info.v3)
                getret = VOP_GETATTR(xp, &at);
        if (dirp)
                diraft_ret = VOP_GETATTR(dirp, &diraft);
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_POSTOPATTR(info.v3) + NFSX_WCCDATA(info.v3),
                              &error));
        if (info.v3) {
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
        }
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        nlookup_done(&nd);
        if (dirp)
                vrele(dirp);
        if (xp)
                vrele(xp);
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs symbolic link service
 */
int
nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
              struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct vattr va, dirfor, diraft;
        struct nlookupdata nd;
        struct vattr *vap = &va;
        struct nfsv2_sattr *sp;
        char *pathcp = NULL;
        struct uio io;
        struct iovec iv;
        int error = 0, len, len2, dirfor_ret = 1, diraft_ret = 1;
        struct vnode *dirp;
        struct vnode *vp;
        struct vnode *dvp;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct nfsm_info info;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        dvp = NULL;
        vp = NULL;

        info.mrep = nfsd->nd_mrep;
        info.mreq =  NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        error = nfs_namei(&nd, cred, NLC_CREATE, &dvp, &vp,
                        fhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                        td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (dirp) {
                if (info.v3)
                        dirfor_ret = VOP_GETATTR(dirp, &dirfor);
        }
        if (error)
                goto out;

        VATTR_NULL(vap);
        if (info.v3) {
                ERROROUT(nfsm_srvsattr(&info, vap));
        }
        NEGATIVEOUT(len2 = nfsm_strsiz(&info, NFS_MAXPATHLEN));
        pathcp = kmalloc(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_td = NULL;
        ERROROUT(nfsm_mtouio(&info, &io, len2));
        if (info.v3 == 0) {
                NULLOUT(sp = nfsm_dissect(&info, NFSX_V2SATTR));
                vap->va_mode = nfstov_mode(sp->sa_mode);
        }
        *(pathcp + len2) = '\0';
        if (vp) {
                error = EEXIST;
                goto out;
        }

        if (vap->va_mode == (mode_t)VNOVAL)
                vap->va_mode = 0;
        if (dvp != vp)
                vn_unlock(dvp);
        error = VOP_NSYMLINK(&nd.nl_nch, dvp, &vp, nd.nl_cred, vap, pathcp);
        vrele(dvp);
        dvp = NULL;
        if (error == 0) {
                bzero(&fhp->fh_fid, sizeof(fhp->fh_fid));
                error = VFS_VPTOFH(vp, &fhp->fh_fid);
                if (!error)
                        error = VOP_GETATTR(vp, vap);
        }

out:
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        if (vp) {
                vput(vp);
                vp = NULL;
        }
        if (pathcp) {
                kfree(pathcp, M_TEMP);
                pathcp = NULL;
        }
        if (dirp) {
                diraft_ret = VOP_GETATTR(dirp, &diraft);
                vrele(dirp);
                dirp = NULL;
        }
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_SRVFH(info.v3) + NFSX_POSTOPATTR(info.v3) +
                              NFSX_WCCDATA(info.v3),
                              &error));
        if (info.v3) {
                if (!error) {
                        nfsm_srvpostop_fh(&info, fhp);
                        nfsm_srvpostop_attr(&info, nfsd, 0, vap);
                }
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
        }
        error = 0;
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        nlookup_done(&nd);
        if (vp)
                vput(vp);
        if (dirp)
                vrele(dirp);
        if (pathcp)
                kfree(pathcp, M_TEMP);
        return (error);
}

/*
 * nfs mkdir service
 */
int
nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
            struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct vattr va, dirfor, diraft;
        struct vattr *vap = &va;
        struct nfs_fattr *fp;
        struct nlookupdata nd;
        u_int32_t *tl;
        int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
        struct vnode *dirp;
        struct vnode *dvp;
        struct vnode *vp;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct nfsm_info info;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        dvp = NULL;
        vp = NULL;

        info.dpos = nfsd->nd_dpos;
        info.mrep = nfsd->nd_mrep;
        info.mreq =  NULL;
        info.md = nfsd->nd_md;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        error = nfs_namei(&nd, cred, NLC_CREATE, &dvp, &vp,
                          fhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (dirp) {
                if (info.v3)
                        dirfor_ret = VOP_GETATTR(dirp, &dirfor);
        }
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_WCCDATA(info.v3), &error));
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
                goto nfsmout;
        }
        VATTR_NULL(vap);
        if (info.v3) {
                ERROROUT(nfsm_srvsattr(&info, vap));
        } else {
                NULLOUT(tl = nfsm_dissect(&info, 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 (vp != NULL) {
                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.
         */
        if (vap->va_mode == (mode_t)VNOVAL)
                vap->va_mode = 0;
        vn_unlock(dvp);
        error = VOP_NMKDIR(&nd.nl_nch, dvp, &vp, nd.nl_cred, vap);
        vrele(dvp);
        dvp = NULL;

        if (error == 0) {
                bzero(&fhp->fh_fid, sizeof(fhp->fh_fid));
                error = VFS_VPTOFH(vp, &fhp->fh_fid);
                if (error == 0)
                        error = VOP_GETATTR(vp, vap);
        }
out:
        if (dirp)
                diraft_ret = VOP_GETATTR(dirp, &diraft);
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_SRVFH(info.v3) + NFSX_POSTOPATTR(info.v3) +
                              NFSX_WCCDATA(info.v3),
                              &error));
        if (info.v3) {
                if (!error) {
                        nfsm_srvpostop_fh(&info, fhp);
                        nfsm_srvpostop_attr(&info, nfsd, 0, vap);
                }
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
        } else {
                nfsm_srvfhtom(&info, fhp);
                fp = nfsm_build(&info, NFSX_V2FATTR);
                nfsm_srvfattr(nfsd, vap, fp);
        }
        error = 0;
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        nlookup_done(&nd);
        if (dirp)
                vrele(dirp);
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        if (vp)
                vput(vp);
        return (error);
}

/*
 * nfs rmdir service
 */
int
nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
            struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
        struct vnode *dirp;
        struct vnode *dvp;
        struct vnode *vp;
        struct vattr dirfor, diraft;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct nlookupdata nd;
        struct nfsm_info info;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        nlookup_zero(&nd);
        dirp = NULL;
        dvp = NULL;
        vp = NULL;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NEGREPLYOUT(len = nfsm_srvnamesiz(&info, &error));

        error = nfs_namei(&nd, cred, NLC_DELETE, &dvp, &vp,
                          fhp, len, slp, nam, &info.md, &info.dpos, &dirp,
                          td, (nfsd->nd_flag & ND_KERBAUTH), FALSE);
        if (dirp) {
                if (info.v3)
                        dirfor_ret = VOP_GETATTR(dirp, &dirfor);
        }
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_WCCDATA(info.v3), &error));
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
                goto nfsmout;
        }
        if (vp->v_type != VDIR) {
                error = ENOTDIR;
                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) {
                if (dvp != vp)
                        vn_unlock(dvp);
                vput(vp);
                vp = NULL;
                error = VOP_NRMDIR(&nd.nl_nch, dvp, nd.nl_cred);
                vrele(dvp);
                dvp = NULL;
        }
        nlookup_done(&nd);

        if (dirp)
                diraft_ret = VOP_GETATTR(dirp, &diraft);
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_WCCDATA(info.v3), &error));
        if (info.v3) {
                nfsm_srvwcc_data(&info, nfsd, dirfor_ret, &dirfor,
                                 diraft_ret, &diraft);
                error = 0;
        }
        /* fall through */

nfsmout:
        *mrq = info.mreq;
        if (dvp) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
        }
        nlookup_done(&nd);
        if (dirp)
                vrele(dirp);
        if (vp)
                vput(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(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
              struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        char *bp, *be;
        struct dirent *dp;
        caddr_t cp;
        u_int32_t *tl;
        struct mbuf *mp1, *mp2;
        char *cpos, *cend, *rbuf;
        struct vnode *vp = NULL;
        struct mount *mp = 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, ncookies;
        u_quad_t off, toff;
#if 0
        u_quad_t verf;
#endif
        off_t *cookies = NULL, *cookiep;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        if (info.v3) {
                NULLOUT(tl = nfsm_dissect(&info, 5 * NFSX_UNSIGNED));
                toff = fxdr_hyper(tl);
                tl += 2;
#if 0
                verf = fxdr_hyper(tl);
#endif
                tl += 2;
        } else {
                NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
                toff = fxdr_unsigned(u_quad_t, *tl++);
#if 0
                verf = 0;       /* shut up gcc */
#endif
        }
        off = toff;
        cnt = fxdr_unsigned(int, *tl);
        siz = roundup2(cnt, DIRBLKSIZ);
        xfer = NFS_SRVMAXDATA(nfsd);
        if ((unsigned)cnt > xfer)
                cnt = xfer;
        if ((unsigned)siz > xfer)
                siz = xfer;
        fullsiz = siz;
        error = nfsrv_fhtovp(fhp, 1, &mp, &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) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }

        /*
         * Obtain lock on vnode for this section of the code
         */

        if (info.v3) {
                error = getret = VOP_GETATTR(vp, &at);
#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(mp, vp, VEXEC, cred, rdonly, td, 0);
        if (error) {
                vput(vp);
                vp = NULL;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_POSTOPATTR(info.v3), &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }
        vn_unlock(vp);

        /*
         * end section.  Allocate rbuf and continue
         */
        rbuf = kmalloc(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_td = NULL;
        eofflag = 0;
        if (cookies) {
                kfree((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 (info.v3) {
                getret = VOP_GETATTR(vp, &at);
                if (!error)
                        error = getret;
        }
        if (error) {
                vrele(vp);
                vp = NULL;
                kfree((caddr_t)rbuf, M_TEMP);
                if (cookies)
                        kfree((caddr_t)cookies, M_TEMP);
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_POSTOPATTR(info.v3), &error));
                nfsm_srvpostop_attr(&info, nfsd, 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;
                        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                              NFSX_POSTOPATTR(info.v3) +
                                              NFSX_COOKIEVERF(info.v3) +
                                              2 * NFSX_UNSIGNED,
                                              &error));
                        if (info.v3) {
                                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                                tl = nfsm_build(&info, 4 * NFSX_UNSIGNED);
                                txdr_hyper(at.va_filerev, tl);
                                tl += 2;
                        } else
                                tl = nfsm_build(&info, 2 * NFSX_UNSIGNED);
                        *tl++ = nfs_false;
                        *tl = nfs_true;
                        kfree((caddr_t)rbuf, M_TEMP);
                        kfree((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_ino == 0 || dp->d_type == DT_WHT ||
                 ((u_quad_t)(*cookiep)) <= toff)) {
                dp = _DIRENT_NEXT(dp);
                cpos = (char *)dp;
                cookiep++;
                ncookies--;
        }
        if (cpos >= cend || ncookies == 0) {
                toff = off;
                siz = fullsiz;
                goto again;
        }

        len = 3 * NFSX_UNSIGNED;        /* paranoia, probably can be 0 */
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_POSTOPATTR(info.v3) +
                              NFSX_COOKIEVERF(info.v3) + siz,
                              &error));
        if (info.v3) {
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                tl = nfsm_build(&info, 2 * NFSX_UNSIGNED);
                txdr_hyper(at.va_filerev, tl);
        }
        mp1 = mp2 = info.mb;
        bp = info.bpos;
        be = bp + M_TRAILINGSPACE(mp1);

        /* Loop through the records and build reply */
        while (cpos < cend && ncookies > 0) {
                if (dp->d_ino != 0 && dp->d_type != DT_WHT) {
                        nlen = dp->d_namlen;
                        rem = nfsm_rndup(nlen) - nlen;
                        len += (4 * NFSX_UNSIGNED + nlen + rem);
                        if (info.v3)
                                len += 2 * NFSX_UNSIGNED;
                        if (len > cnt) {
                                eofflag = 0;
                                break;
                        }
                        /*
                         * Build the directory record xdr from
                         * the dirent entry.
                         */
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = nfs_true;
                        bp += NFSX_UNSIGNED;
                        if (info.v3) {
                                tl = nfsm_clget(&info, mp1, mp2, bp, be);
                                *tl = txdr_unsigned(dp->d_ino >> 32);
                                bp += NFSX_UNSIGNED;
                        }
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = txdr_unsigned(dp->d_ino);
                        bp += NFSX_UNSIGNED;
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = txdr_unsigned(nlen);
                        bp += NFSX_UNSIGNED;

                        /* And loop around copying the name */
                        xfer = nlen;
                        cp = dp->d_name;
                        while (xfer > 0) {
                                tl = nfsm_clget(&info, mp1, mp2, bp, be);
                                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';
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);

                        /* Finish off the record */
                        if (info.v3) {
                                *tl = txdr_unsigned(*cookiep >> 32);
                                bp += NFSX_UNSIGNED;
                                tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        }
                        *tl = txdr_unsigned(*cookiep);
                        bp += NFSX_UNSIGNED;
                }
                dp = _DIRENT_NEXT(dp);
                cpos = (char *)dp;
                cookiep++;
                ncookies--;
        }
        vrele(vp);
        vp = NULL;
        tl = nfsm_clget(&info, mp1, mp2, bp, be);
        *tl = nfs_false;
        bp += NFSX_UNSIGNED;
        tl = nfsm_clget(&info, mp1, mp2, bp, be);
        if (eofflag)
                *tl = nfs_true;
        else
                *tl = nfs_false;
        bp += NFSX_UNSIGNED;
        if (mp1 != info.mb) {
                if (bp < be)
                        mp1->m_len = bp - mtod(mp1, caddr_t);
        } else
                mp1->m_len += bp - info.bpos;
        kfree((caddr_t)rbuf, M_TEMP);
        kfree((caddr_t)cookies, M_TEMP);

nfsmout:
        *mrq = info.mreq;
        if (vp)
                vrele(vp);
        return(error);
}

int
nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
                  struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        char *bp, *be;
        struct dirent *dp;
        caddr_t cp;
        u_int32_t *tl;
        struct mbuf *mp1, *mp2;
        char *cpos, *cend, *rbuf;
        struct vnode *vp = NULL, *nvp;
        struct mount *mp = NULL;
        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, dirlen, ncookies;
        u_quad_t off, toff;
#if 0
        u_quad_t verf;
#endif
        off_t *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NULLOUT(tl = nfsm_dissect(&info, 6 * NFSX_UNSIGNED));
        toff = fxdr_hyper(tl);
        tl += 2;
#if 0
        verf = fxdr_hyper(tl);
#endif
        tl += 2;
        siz = fxdr_unsigned(int, *tl++);
        cnt = fxdr_unsigned(int, *tl);
        off = toff;
        siz = roundup2(siz, DIRBLKSIZ);
        xfer = NFS_SRVMAXDATA(nfsd);
        if ((unsigned)cnt > xfer)
                cnt = xfer;
        if ((unsigned)siz > xfer)
                siz = xfer;
        fullsiz = siz;
        error = nfsrv_fhtovp(fhp, 1, &mp, &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) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }
        error = getret = VOP_GETATTR(vp, &at);
#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(mp, vp, VEXEC, cred, rdonly, td, 0);
        }
        if (error) {
                vput(vp);
                vp = NULL;
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_V3POSTOPATTR, &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }
        vn_unlock(vp);
        rbuf = kmalloc(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_td = NULL;
        eofflag = 0;
        if (cookies) {
                kfree((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);
        if (!cookies && !error)
                error = NFSERR_PERM;
        if (!error)
                error = getret;
        if (error) {
                vrele(vp);
                vp = NULL;
                if (cookies)
                        kfree((caddr_t)cookies, M_TEMP);
                kfree((caddr_t)rbuf, M_TEMP);
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_V3POSTOPATTR, &error));
                nfsm_srvpostop_attr(&info, nfsd, 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;
                        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                              NFSX_V3POSTOPATTR +
                                              NFSX_V3COOKIEVERF +
                                              2 * NFSX_UNSIGNED,
                                              &error));
                        nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                        tl = nfsm_build(&info, 4 * NFSX_UNSIGNED);
                        txdr_hyper(at.va_filerev, tl);
                        tl += 2;
                        *tl++ = nfs_false;
                        *tl = nfs_true;
                        kfree((caddr_t)cookies, M_TEMP);
                        kfree((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_ino == 0 || dp->d_type == DT_WHT ||
                 ((u_quad_t)(*cookiep)) <= toff)) {
                dp = _DIRENT_NEXT(dp);
                cpos = (char *)dp;
                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, vp, dp->d_ino, &nvp) == EOPNOTSUPP) {
                error = NFSERR_NOTSUPP;
                vrele(vp);
                vp = NULL;
                kfree((caddr_t)cookies, M_TEMP);
                kfree((caddr_t)rbuf, M_TEMP);
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      NFSX_V3POSTOPATTR, &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }
        if (nvp) {
                vput(nvp);
                nvp = NULL;
        }
            
        dirlen = len = NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF +
                        2 * NFSX_UNSIGNED;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, cnt, &error));
        nfsm_srvpostop_attr(&info, nfsd, getret, &at);
        tl = nfsm_build(&info, 2 * NFSX_UNSIGNED);
        txdr_hyper(at.va_filerev, tl);
        mp1 = mp2 = info.mb;
        bp = info.bpos;
        be = bp + M_TRAILINGSPACE(mp1);

        /* Loop through the records and build reply */
        while (cpos < cend && ncookies > 0) {
                if (dp->d_ino != 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, vp, dp->d_ino, &nvp))
                                goto invalid;
                        bzero((caddr_t)nfhp, NFSX_V3FH);
                        nfhp->fh_fsid = fhp->fh_fsid;
                        if (VFS_VPTOFH(nvp, &nfhp->fh_fid)) {
                                vput(nvp);
                                nvp = NULL;
                                goto invalid;
                        }
                        if (VOP_GETATTR(nvp, vap)) {
                                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_srvfattr(nfsd, vap, fp);
                        fl.fl_off.nfsuquad[0] = txdr_unsigned(*cookiep >> 32);
                        fl.fl_off.nfsuquad[1] = txdr_unsigned(*cookiep);
                        fl.fl_postopok = nfs_true;
                        fl.fl_fhok = nfs_true;
                        fl.fl_fhsize = txdr_unsigned(NFSX_V3FH);

                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = nfs_true;
                        bp += NFSX_UNSIGNED;
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = txdr_unsigned(dp->d_ino >> 32);
                        bp += NFSX_UNSIGNED;
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = txdr_unsigned(dp->d_ino);
                        bp += NFSX_UNSIGNED;
                        tl = nfsm_clget(&info, mp1, mp2, bp, be);
                        *tl = txdr_unsigned(nlen);
                        bp += NFSX_UNSIGNED;

                        /* And loop around copying the name */
                        xfer = nlen;
                        cp = dp->d_name;
                        while (xfer > 0) {
                                tl = nfsm_clget(&info, mp1, mp2, bp, be);
                                if ((bp + xfer) > be)
                                        tsiz = be - bp;
                                else
                                        tsiz = xfer;
                                bcopy(cp, bp, tsiz);
                                bp += tsiz;
                                xfer -= tsiz;
                                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) {
                                tl = nfsm_clget(&info, mp1, mp2, bp, be);
                                if ((bp + xfer) > be)
                                        tsiz = be - bp;
                                else
                                        tsiz = xfer;
                                bcopy(cp, bp, tsiz);
                                bp += tsiz;
                                xfer -= tsiz;
                                cp += tsiz;
                        }
                }
invalid:
                dp = _DIRENT_NEXT(dp);
                cpos = (char *)dp;
                cookiep++;
                ncookies--;
        }
        vrele(vp);
        vp = NULL;
        tl = nfsm_clget(&info, mp1, mp2, bp, be);
        *tl = nfs_false;
        bp += NFSX_UNSIGNED;
        tl = nfsm_clget(&info, mp1, mp2, bp, be);
        if (eofflag)
                *tl = nfs_true;
        else
                *tl = nfs_false;
        bp += NFSX_UNSIGNED;
        if (mp1 != info.mb) {
                if (bp < be)
                        mp1->m_len = bp - mtod(mp1, caddr_t);
        } else
                mp1->m_len += bp - info.bpos;
        kfree((caddr_t)cookies, M_TEMP);
        kfree((caddr_t)rbuf, M_TEMP);
nfsmout:
        *mrq = info.mreq;
        if (vp)
                vrele(vp);
        return(error);
}

/*
 * nfs commit service
 */
int
nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct vattr bfor, aft;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        nfsfh_t nfh;
        fhandle_t *fhp;
        u_int32_t *tl;
        int error = 0, rdonly, for_ret = 1, aft_ret = 1, cnt;
        u_quad_t off;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));

        /*
         * XXX At this time VOP_FSYNC() does not accept offset and byte
         * count parameters, so these arguments are useless (someday maybe).
         */
        off = fxdr_hyper(tl);
        tl += 2;
        cnt = fxdr_unsigned(int, *tl);
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                                      2 * NFSX_UNSIGNED, &error));
                nfsm_srvwcc_data(&info, nfsd, for_ret, &bfor,
                                 aft_ret, &aft);
                error = 0;
                goto nfsmout;
        }
        for_ret = VOP_GETATTR(vp, &bfor);

        /*
         * RFC 1813 3.3.21: If count is 0, a flush from offset to the end of
         * file is done. At this time VOP_FSYNC does not accept offset and
         * byte count parameters, so call VOP_FSYNC the whole file for now.
         */
        if (cnt == 0 || cnt > MAX_COMMIT_COUNT) {
                /*
                 * Give up and do the whole thing
                 */
                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, MNT_WAIT, 0);
        } else {
                /*
                 * Locate and synchronously write any buffers that fall
                 * into the requested range.  Note:  we are assuming that
                 * f_iosize is a power of 2.
                 */
                int iosize = vp->v_mount->mnt_stat.f_iosize;
                int iomask = iosize - 1;
                off_t loffset;

                /*
                 * Align to iosize boundry, super-align to page boundry.
                 */
                if (off & iomask) {
                        cnt += off & iomask;
                        off &= ~(u_quad_t)iomask;
                }
                if (off & PAGE_MASK) {
                        cnt += off & PAGE_MASK;
                        off &= ~(u_quad_t)PAGE_MASK;
                }
                loffset = off;

                if (vp->v_object &&
                   (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
                        vm_object_page_clean(vp->v_object, off / PAGE_SIZE,
                            (cnt + PAGE_MASK) / PAGE_SIZE, OBJPC_SYNC);
                }

                crit_enter();
                while (error == 0 || cnt > 0) {
                        struct buf *bp;

                        /*
                         * If we have a buffer and it is marked B_DELWRI we
                         * have to lock and write it.  Otherwise the prior
                         * write is assumed to have already been committed.
                         *
                         * WARNING: FINDBLK_TEST buffers represent stable
                         *          storage but not necessarily stable
                         *          content.  It is ok in this case.
                         */
                        if ((bp = findblk(vp, loffset, FINDBLK_TEST)) != NULL) {
                                if (bp->b_flags & B_DELWRI)
                                        bp = findblk(vp, loffset, 0);
                                else
                                        bp = NULL;
                        }
                        if (bp) {
                                if (bp->b_flags & B_DELWRI) {
                                        bremfree(bp);
                                        error = bwrite(bp);
                                        ++nfs_commit_miss;
                                } else {
                                        BUF_UNLOCK(bp);
                                }
                        }
                        ++nfs_commit_blks;
                        if (cnt < iosize)
                                break;
                        cnt -= iosize;
                        loffset += iosize;
                }
                crit_exit();
        }

        aft_ret = VOP_GETATTR(vp, &aft);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_V3WCCDATA + NFSX_V3WRITEVERF,
                              &error));
        nfsm_srvwcc_data(&info, nfsd, for_ret, &bfor,
                         aft_ret, &aft);
        if (!error) {
                tl = nfsm_build(&info, NFSX_V3WRITEVERF);
                if (nfsver.tv_sec == 0)
                        nfsver = boottime;
                *tl++ = txdr_unsigned(nfsver.tv_sec);
                *tl = txdr_unsigned(nfsver.tv_nsec / 1000);
        } else {
                error = 0;
        }
nfsmout:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs statfs service
 */
int
nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct statfs *sf;
        struct nfs_statfs *sfp;
        int error = 0, rdonly, getret = 1;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        struct vattr at;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct statfs statfs;
        u_quad_t tval;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;
        info.v3 = (nfsd->nd_flag & ND_NFSV3);

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }
        sf = &statfs;
        error = VFS_STATFS(vp->v_mount, sf, proc0.p_ucred);
        getret = VOP_GETATTR(vp, &at);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_POSTOPATTR(info.v3) + NFSX_STATFS(info.v3),
                              &error));
        if (info.v3)
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
        if (error) {
                error = 0;
                goto nfsmout;
        }
        sfp = nfsm_build(&info, NFSX_STATFS(info.v3));
        if (info.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:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs fsinfo service
 */
int
nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
             struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nfsv3_fsinfo *sip;
        int error = 0, rdonly, getret = 1, pref;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        struct vattr at;
        nfsfh_t nfh;
        fhandle_t *fhp;
        u_quad_t maxfsize;
        struct statfs sb;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, getret, &at);
                error = 0;
                goto nfsmout;
        }

        /* XXX Try to make a guess on the max file size. */
        VFS_STATFS(vp->v_mount, &sb, proc0.p_ucred);
        maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1;

        getret = VOP_GETATTR(vp, &at);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_V3POSTOPATTR + NFSX_V3FSINFO, &error));
        nfsm_srvpostop_attr(&info, nfsd, getret, &at);
        sip = nfsm_build(&info, 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:
        *mrq = info.mreq;
        if (vp)
                vput(vp);
        return(error);
}

/*
 * nfs pathconf service
 */
int
nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
               struct thread *td, struct mbuf **mrq)
{
        struct sockaddr *nam = nfsd->nd_nam;
        struct ucred *cred = &nfsd->nd_cr;
        struct nfsv3_pathconf *pc;
        int error = 0, rdonly, getret = 1;
        register_t linkmax, namemax, chownres, notrunc;
        struct vnode *vp = NULL;
        struct mount *mp = NULL;
        struct vattr at;
        nfsfh_t nfh;
        fhandle_t *fhp;
        struct nfsm_info info;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;
        info.md = nfsd->nd_md;
        info.dpos = nfsd->nd_dpos;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        fhp = &nfh.fh_generic;
        NEGREPLYOUT(nfsm_srvmtofh(&info, nfsd, fhp, &error));
        error = nfsrv_fhtovp(fhp, 1, &mp, &vp, cred, slp, nam,
                 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
        if (error) {
                NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, NFSX_UNSIGNED, &error));
                nfsm_srvpostop_attr(&info, nfsd, 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);
        vput(vp);
        vp = NULL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp,
                              NFSX_V3POSTOPATTR + NFSX_V3PATHCONF,
                              &error));
        nfsm_srvpostop_attr(&info, nfsd, getret, &at);
        if (error) {
                error = 0;
                goto nfsmout;
        }
        pc = nfsm_build(&info, 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:
        *mrq = info.mreq;
        if (vp) 
                vput(vp);
        return(error);
}

/*
 * Null operation, used by clients to ping server
 */
/* ARGSUSED */
int
nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
           struct thread *td, struct mbuf **mrq)
{
        struct nfsm_info info;
        int error = NFSERR_RETVOID;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, 0, &error));
nfsmout:
        *mrq = info.mreq;
        return (error);
}

/*
 * No operation, used for obsolete procedures
 */
/* ARGSUSED */
int
nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
           struct thread *td, struct mbuf **mrq)
{
        struct nfsm_info info;
        int error;

        info.mrep = nfsd->nd_mrep;
        info.mreq = NULL;

        nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
        if (nfsd->nd_repstat)
                error = nfsd->nd_repstat;
        else
                error = EPROCUNAVAIL;
        NEGKEEPOUT(nfsm_reply(&info, nfsd, slp, 0, &error));
        error = 0;
nfsmout:
        *mrq = info.mreq;
        return (error);
}

/*
 * 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(struct mount *mp, struct vnode *vp, int flags, struct ucred *cred,
             int rdonly, struct thread *td, 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 || 
                    ((mp->mnt_flag | 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);
        if (error)
                return (error);
        error = VOP_ACCESS(vp, flags, cred);    /* XXX ruid/rgid vs uid/gid */
        /*
         * 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 */