/*      $OpenBSD: nfs_vnops.c,v 1.209 2025/09/20 13:53:36 mpi Exp $     */
/*      $NetBSD: nfs_vnops.c,v 1.62.4.1 1996/07/08 20:26:52 jtc Exp $   */

/*
 * 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_vnops.c 8.16 (Berkeley) 5/27/95
 */


/*
 * vnode op calls for Sun NFS version 2 and 3
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/mbuf.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/lockf.h>
#include <sys/queue.h>
#include <sys/specdev.h>
#include <sys/unistd.h>

#include <miscfs/fifofs/fifo.h>

#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfs_var.h>
#include <nfs/nfsm_subs.h>

int nfs_access(void *);
int nfs_advlock(void *);
int nfs_bmap(void *);
int nfs_bwrite(void *);
int nfs_close(void *);
int nfs_commit(struct vnode *, u_quad_t, int, struct proc *);
int nfs_create(void *);
int nfs_flush(struct vnode *, struct ucred *, int, struct proc *, int);
int nfs_fsync(void *);
int nfs_getattr(void *);
int nfs_islocked(void *);
int nfs_link(void *);
int nfs_lock(void *);
int nfs_lookitup(struct vnode *, char *, int, struct ucred *, struct proc *,
        struct nfsnode **);
int nfs_lookup(void *);
int nfs_mkdir(void *);
int nfs_mknod(void *);
int nfs_mknodrpc(struct vnode *, struct vnode **, struct componentname *,
        struct vattr *);
int nfs_open(void *);
int nfs_pathconf(void *);
int nfs_print(void *);
int nfs_read(void *);
int nfs_readdir(void *);
int nfs_readdirplusrpc(struct vnode *, struct uio *, struct ucred *, int *,
        struct proc *);
int nfs_readdirrpc(struct vnode *, struct uio *, struct ucred *, int *);
int nfs_remove(void *);
int nfs_removerpc(struct vnode *, char *, int, struct ucred *, struct proc *);
int nfs_rename(void *);
int nfs_renameit(struct vnode *, struct componentname *, struct sillyrename *);
int nfs_renamerpc(struct vnode *, char *, int, struct vnode *, char *, int,
        struct ucred *, struct proc *);
int nfs_rmdir(void *);
int nfs_setattr(void *);
int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
        struct proc *);
int nfs_sillyrename(struct vnode *, struct vnode *,
                         struct componentname *);
int nfs_strategy(void *);
int nfs_symlink(void *);
int nfs_unlock(void *);

void nfs_cache_enter(struct vnode *, struct vnode *, struct componentname *);

int nfsfifo_close(void *);
int nfsfifo_read(void *);
int nfsfifo_reclaim(void *);
int nfsfifo_write(void *);

int nfsspec_access(void *);
int nfsspec_close(void *);
int nfsspec_read(void *);
int nfsspec_write(void *);

/* Global vfs data structures for nfs. */
const struct vops nfs_vops = {
        .vop_lookup     = nfs_lookup,
        .vop_create     = nfs_create,
        .vop_mknod      = nfs_mknod,
        .vop_open       = nfs_open,
        .vop_close      = nfs_close,
        .vop_access     = nfs_access,
        .vop_getattr    = nfs_getattr,
        .vop_setattr    = nfs_setattr,
        .vop_read       = nfs_read,
        .vop_write      = nfs_write,
        .vop_ioctl      = nfs_ioctl,
        .vop_kqfilter   = nfs_kqfilter,
        .vop_revoke     = vop_generic_revoke,
        .vop_fsync      = nfs_fsync,
        .vop_remove     = nfs_remove,
        .vop_link       = nfs_link,
        .vop_rename     = nfs_rename,
        .vop_mkdir      = nfs_mkdir,
        .vop_rmdir      = nfs_rmdir,
        .vop_symlink    = nfs_symlink,
        .vop_readdir    = nfs_readdir,
        .vop_readlink   = nfs_readlink,
        .vop_abortop    = vop_generic_abortop,
        .vop_inactive   = nfs_inactive,
        .vop_reclaim    = nfs_reclaim,
        .vop_lock       = nfs_lock,
        .vop_unlock     = nfs_unlock,
        .vop_bmap       = nfs_bmap,
        .vop_strategy   = nfs_strategy,
        .vop_print      = nfs_print,
        .vop_islocked   = nfs_islocked,
        .vop_pathconf   = nfs_pathconf,
        .vop_advlock    = nfs_advlock,
        .vop_bwrite     = nfs_bwrite
};

/* Special device vnode ops. */
const struct vops nfs_specvops = {
        .vop_close      = nfsspec_close,
        .vop_access     = nfsspec_access,
        .vop_getattr    = nfs_getattr,
        .vop_setattr    = nfs_setattr,
        .vop_read       = nfsspec_read,
        .vop_write      = nfsspec_write,
        .vop_fsync      = nfs_fsync,
        .vop_inactive   = nfs_inactive,
        .vop_reclaim    = nfs_reclaim,
        .vop_lock       = nfs_lock,
        .vop_unlock     = nfs_unlock,
        .vop_print      = nfs_print,
        .vop_islocked   = nfs_islocked,

        /* XXX: Keep in sync with spec_vops. */
        .vop_lookup     = vop_generic_lookup,
        .vop_create     = vop_generic_badop,
        .vop_mknod      = vop_generic_badop,
        .vop_open       = spec_open,
        .vop_ioctl      = spec_ioctl,
        .vop_kqfilter   = spec_kqfilter,
        .vop_revoke     = vop_generic_revoke,
        .vop_remove     = vop_generic_badop,
        .vop_link       = vop_generic_badop,
        .vop_rename     = vop_generic_badop,
        .vop_mkdir      = vop_generic_badop,
        .vop_rmdir      = vop_generic_badop,
        .vop_symlink    = vop_generic_badop,
        .vop_readdir    = vop_generic_badop,
        .vop_readlink   = vop_generic_badop,
        .vop_abortop    = vop_generic_badop,
        .vop_bmap       = vop_generic_bmap,
        .vop_strategy   = spec_strategy,
        .vop_pathconf   = spec_pathconf,
        .vop_advlock    = spec_advlock,
        .vop_bwrite     = vop_generic_bwrite,
};

#ifdef FIFO
const struct vops nfs_fifovops = {
        .vop_close      = nfsfifo_close,
        .vop_access     = nfsspec_access,
        .vop_getattr    = nfs_getattr,
        .vop_setattr    = nfs_setattr,
        .vop_read       = nfsfifo_read,
        .vop_write      = nfsfifo_write,
        .vop_fsync      = nfs_fsync,
        .vop_inactive   = nfs_inactive,
        .vop_reclaim    = nfsfifo_reclaim,
        .vop_lock       = nfs_lock,
        .vop_unlock     = nfs_unlock,
        .vop_print      = nfs_print,
        .vop_islocked   = nfs_islocked,
        .vop_bwrite     = vop_generic_bwrite,

        /* XXX: Keep in sync with fifo_vops. */
        .vop_lookup     = vop_generic_lookup,
        .vop_create     = vop_generic_badop,
        .vop_mknod      = vop_generic_badop,
        .vop_open       = fifo_open,
        .vop_ioctl      = fifo_ioctl,
        .vop_kqfilter   = fifo_kqfilter,
        .vop_revoke     = vop_generic_revoke,
        .vop_remove     = vop_generic_badop,
        .vop_link       = vop_generic_badop,
        .vop_rename     = vop_generic_badop,
        .vop_mkdir      = vop_generic_badop,
        .vop_rmdir      = vop_generic_badop,
        .vop_symlink    = vop_generic_badop,
        .vop_readdir    = vop_generic_badop,
        .vop_readlink   = vop_generic_badop,
        .vop_abortop    = vop_generic_badop,
        .vop_bmap       = vop_generic_bmap,
        .vop_strategy   = vop_generic_badop,
        .vop_pathconf   = fifo_pathconf,
        .vop_advlock    = fifo_advlock,
};
#endif /* FIFO */

/*
 * Global variables
 */
extern u_int32_t nfs_true, nfs_false;
extern u_int32_t nfs_xdrneg1;
extern struct nfsstats nfsstats;
extern const nfstype nfsv3_type[9];
int nfs_numasync = 0;

void
nfs_cache_enter(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
        struct nfsnode *np;

        if (vp != NULL) {
                np = VTONFS(vp);
                np->n_ctime = np->n_vattr.va_ctime.tv_sec;
        } else {
                np = VTONFS(dvp);
                if (!np->n_ctime)
                        np->n_ctime = np->n_vattr.va_mtime.tv_sec;
        }

        cache_enter(dvp, vp, cnp);
}

/*
 * nfs access vnode op.
 * For nfs version 2, just return ok. File accesses may fail later.
 * For nfs version 3, use the access rpc to check accessibility. If file modes
 * are changed on the server, accesses might still fail later.
 */
int
nfs_access(void *v)
{
        struct vop_access_args *ap = v;
        struct vnode *vp = ap->a_vp;
        u_int32_t *tl;
        int error = 0, attrflag;
        u_int32_t mode, rmode;
        int v3 = NFS_ISV3(vp);
        int cachevalid;
        struct nfsm_info        info;

        struct nfsnode *np = VTONFS(vp);

        /*
         * Disallow write attempts on filesystems mounted read-only;
         * unless the file is a socket, fifo, or a block or character
         * device resident on the filesystem.
         */
        if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
                switch (vp->v_type) {
                case VREG:
                case VDIR:
                case VLNK:
                        return (EROFS);
                default:
                        break;
                }
        }

        /*
         * Check access cache first. If a request has been made for this uid
         * shortly before, use the cached result.
         */
        cachevalid = (np->n_accstamp != -1 &&
            (gettime() - np->n_accstamp) < nfs_attrtimeo(np) &&
            np->n_accuid == ap->a_cred->cr_uid);

        if (cachevalid) {
                if (!np->n_accerror) {
                        if ((np->n_accmode & ap->a_mode) == ap->a_mode)
                                return (np->n_accerror);
                } else if ((np->n_accmode & ap->a_mode) == np->n_accmode)
                        return (np->n_accerror);
        }

        /*
         * For nfs v3, do an access rpc, otherwise you are stuck emulating
         * ufs_access() locally using the vattr. This may not be correct,
         * since the server may apply other access criteria such as
         * client uid-->server uid mapping that we do not know about, but
         * this is better than just returning anything that is lying about
         * in the cache.
         */
        if (v3) {
                nfsstats.rpccnt[NFSPROC_ACCESS]++;
                info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(v3) + NFSX_UNSIGNED);
                nfsm_fhtom(&info, vp, v3);
                tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
                if (ap->a_mode & VREAD)
                        mode = NFSV3ACCESS_READ;
                else
                        mode = 0;
                if (vp->v_type == VDIR) {
                        if (ap->a_mode & VWRITE)
                                mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
                                         NFSV3ACCESS_DELETE);
                        if (ap->a_mode & VEXEC)
                                mode |= NFSV3ACCESS_LOOKUP;
                } else {
                        if (ap->a_mode & VWRITE)
                                mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
                        if (ap->a_mode & VEXEC)
                                mode |= NFSV3ACCESS_EXECUTE;
                }
                *tl = txdr_unsigned(mode);

                info.nmi_procp = ap->a_p;
                info.nmi_cred = ap->a_cred;
                info.nmi_errorp = &error;
                error = nfs_request(vp, NFSPROC_ACCESS, &info);

                if (nfsm_postop_attr(&info, &vp, &attrflag) != 0)
                        goto nfsmout;
                if (error) {
                        m_freem(info.nmi_mrep);
                        goto nfsmout;
                }

                tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED);
                if (tl == NULL)
                        goto nfsmout;
                rmode = fxdr_unsigned(u_int32_t, *tl);
                /*
                 * The NFS V3 spec does not clarify whether or not
                 * the returned access bits can be a superset of
                 * the ones requested, so...
                 */
                if ((rmode & mode) != mode)
                        error = EACCES;

                m_freem(info.nmi_mrep);
        } else
                return (nfsspec_access(ap));


        /*
         * If we got the same result as for a previous, different request, OR
         * it in. Don't update the timestamp in that case.
         */
        if (!error || error == EACCES) {
                if (cachevalid && np->n_accstamp != -1 &&
                    error == np->n_accerror) {
                        if (!error)
                                np->n_accmode |= ap->a_mode;
                        else {
                                if ((np->n_accmode & ap->a_mode) == ap->a_mode)
                                        np->n_accmode = ap->a_mode;
                        }
                } else {
                        np->n_accstamp = gettime();
                        np->n_accuid = ap->a_cred->cr_uid;
                        np->n_accmode = ap->a_mode;
                        np->n_accerror = error;
                }
        }
nfsmout:
        return (error);
}

/*
 * nfs open vnode op
 * Check to see if the type is ok
 * and that deletion is not in progress.
 * For paged in text files, you will need to flush the page cache
 * if consistency is lost.
 */
int
nfs_open(void *v)
{
        struct vop_open_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        struct vattr vattr;
        int error;

        if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
#ifdef DIAGNOSTIC
                printf("open eacces vtyp=%d\n",vp->v_type);
#endif
                return (EACCES);
        }

        /*
         * Initialize read and write creds here, for swapfiles
         * and other paths that don't set the creds themselves.
         */

        if (ap->a_mode & FREAD) {
                if (np->n_rcred) {
                        crfree(np->n_rcred);
                }
                np->n_rcred = ap->a_cred;
                crhold(np->n_rcred);
        }
        if (ap->a_mode & FWRITE) {
                if (np->n_wcred) {
                        crfree(np->n_wcred);
                }
                np->n_wcred = ap->a_cred;
                crhold(np->n_wcred);
        }

        if (np->n_flag & NMODIFIED) {
                error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
                if (error == EINTR)
                        return (error);
                uvm_vnp_uncache(vp);
                NFS_INVALIDATE_ATTRCACHE(np);
                if (vp->v_type == VDIR)
                        np->n_direofoffset = 0;
                error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
                if (error)
                        return (error);
                np->n_mtime = vattr.va_mtime;
        } else {
                error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
                if (error)
                        return (error);
                if (timespeccmp(&np->n_mtime, &vattr.va_mtime, !=)) {
                        if (vp->v_type == VDIR)
                                np->n_direofoffset = 0;
                        error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
                        if (error == EINTR)
                                return (error);
                        uvm_vnp_uncache(vp);
                        np->n_mtime = vattr.va_mtime;
                }
        }
        /* For open/close consistency. */
        NFS_INVALIDATE_ATTRCACHE(np);
        return (0);
}

/*
 * nfs close vnode op
 * What an NFS client should do upon close after writing is a debatable issue.
 * Most NFS clients push delayed writes to the server upon close, basically for
 * two reasons:
 * 1 - So that any write errors may be reported back to the client process
 *     doing the close system call. By far the two most likely errors are
 *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
 * 2 - To put a worst case upper bound on cache inconsistency between
 *     multiple clients for the file.
 * There is also a consistency problem for Version 2 of the protocol w.r.t.
 * not being able to tell if other clients are writing a file concurrently,
 * since there is no way of knowing if the changed modify time in the reply
 * is only due to the write for this client.
 * (NFS Version 3 provides weak cache consistency data in the reply that
 *  should be sufficient to detect and handle this case.)
 *
 * The current code does the following:
 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
 *                     or commit them (this satisfies 1 and 2 except for the
 *                     case where the server crashes after this close but
 *                     before the commit RPC, which is felt to be "good
 *                     enough". Changing the last argument to nfs_flush() to
 *                     a 1 would force a commit operation, if it is felt a
 *                     commit is necessary now.
 */
int
nfs_close(void *v)
{
        struct vop_close_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        int error = 0;

        if (vp->v_type == VREG) {
            if (np->n_flag & NMODIFIED) {
                if (NFS_ISV3(vp)) {
                    error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, 0);
                    np->n_flag &= ~NMODIFIED;
                } else
                    error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
                NFS_INVALIDATE_ATTRCACHE(np);
            }
            if (np->n_flag & NWRITEERR) {
                np->n_flag &= ~NWRITEERR;
                error = np->n_error;
            }
        }
        return (error);
}

static inline int
nfsm_loadattr(struct nfsm_info *infop, struct vnode **vpp, struct vattr *vap)
{
        struct vnode *ttvp = *vpp;
        int error;

        error = nfs_loadattrcache(&ttvp, &infop->nmi_md, &infop->nmi_dpos, vap);
        if (error != 0) {
                m_freem(infop->nmi_mrep);
                infop->nmi_mrep = NULL;
                *infop->nmi_errorp = error;
                return error;
        }
        *vpp = ttvp;
        return 0;
}

/*
 * nfs getattr call from vfs.
 */
int
nfs_getattr(void *v)
{
        struct vop_getattr_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        struct nfsm_info        info;
        int error = 0;

        info.nmi_v3 = NFS_ISV3(vp);

        /*
         * Update local times for special files.
         */
        if (np->n_flag & (NACC | NUPD))
                np->n_flag |= NCHG;
        /*
         * First look in the cache.
         */
        if (nfs_getattrcache(vp, ap->a_vap) == 0)
                return (0);

        nfsstats.rpccnt[NFSPROC_GETATTR]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3));
        nfsm_fhtom(&info, vp, info.nmi_v3);
        info.nmi_procp = ap->a_p;
        info.nmi_cred = ap->a_cred;
        info.nmi_errorp = &error;
        error = nfs_request(vp, NFSPROC_GETATTR, &info);
        if (!error) {
                if (nfsm_loadattr(&info, &vp, ap->a_vap) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);
nfsmout: 
        return (error);
}

/*
 * nfs setattr call.
 */
int
nfs_setattr(void *v)
{
        struct vop_setattr_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        struct vattr *vap = ap->a_vap;
        int hint = NOTE_ATTRIB;
        int error = 0;
        u_quad_t tsize = 0;

        /*
         * Setting of flags is not supported.
         */
        if (vap->va_flags != VNOVAL)
                return (EOPNOTSUPP);

        /*
         * Disallow write attempts if the filesystem is mounted read-only.
         */
        if ((vap->va_uid != (uid_t)VNOVAL ||
            vap->va_gid != (gid_t)VNOVAL ||
            vap->va_atime.tv_nsec != VNOVAL ||
            vap->va_mtime.tv_nsec != VNOVAL ||
            vap->va_mode != (mode_t)VNOVAL) &&
            (vp->v_mount->mnt_flag & MNT_RDONLY))
                return (EROFS);
        if (vap->va_size != VNOVAL) {
                switch (vp->v_type) {
                case VDIR:
                        return (EISDIR);
                case VCHR:
                case VBLK:
                case VSOCK:
                case VFIFO:
                        if (vap->va_mtime.tv_nsec == VNOVAL &&
                            vap->va_atime.tv_nsec == VNOVAL &&
                            vap->va_mode == (mode_t)VNOVAL &&
                            vap->va_uid == (uid_t)VNOVAL &&
                            vap->va_gid == (gid_t)VNOVAL)
                                return (0);
                        vap->va_size = VNOVAL;
                        break;
                default:
                        /*
                         * Disallow write attempts if the filesystem is
                         * mounted read-only.
                         */
                        if (vp->v_mount->mnt_flag & MNT_RDONLY)
                                return (EROFS);
                        if (vap->va_size == 0)
                                error = nfs_vinvalbuf(vp, 0,
                                     ap->a_cred, ap->a_p);
                        else
                                error = nfs_vinvalbuf(vp, V_SAVE,
                                     ap->a_cred, ap->a_p);
                        if (error)
                                return (error);
                        tsize = np->n_size;
                        np->n_size = np->n_vattr.va_size = vap->va_size;
                        uvm_vnp_setsize(vp, np->n_size);
                }
        } else if ((vap->va_mtime.tv_nsec != VNOVAL ||
                vap->va_atime.tv_nsec != VNOVAL) &&
                vp->v_type == VREG &&
                (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
                    ap->a_p)) == EINTR)
                return (error);
        error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_p);
        if (error && vap->va_size != VNOVAL) {
                np->n_size = np->n_vattr.va_size = tsize;
                uvm_vnp_setsize(vp, np->n_size);
        }

        if (vap->va_size != VNOVAL && vap->va_size < tsize)
                hint |= NOTE_TRUNCATE;

        VN_KNOTE(vp, hint); /* XXX setattrrpc? */

        return (error);
}

/* Used as *flagp for nfsm_wcc_data() below */
#define NFSV3_WCCRATTR  0
#define NFSV3_WCCCHK    1

static inline int
nfsm_wcc_data(struct nfsm_info *infop, struct vnode **vpp, int *flagp)
{
        struct timespec mtime;
        int ttattrf, ttretf = 0;
        uint32_t *tl;

        if (infop->nmi_mrep == NULL)
                return 0;

        tl = (uint32_t *)nfsm_dissect(infop, NFSX_UNSIGNED);
        if (tl == NULL)
                return 1;
        if (*tl == nfs_true) {
                tl = (uint32_t *)nfsm_dissect(infop, 6 * NFSX_UNSIGNED);
                if (tl == NULL)
                        return 1;
                fxdr_nfsv3time(tl + 2, &mtime);
                if (*flagp != NFSV3_WCCRATTR) {
                        ttretf =
                            timespeccmp(&VTONFS(*vpp)->n_mtime, &mtime, !=);
                }
        }
        if (nfsm_postop_attr(infop, vpp, &ttattrf) != 0)
                return 1;
        if (*flagp != NFSV3_WCCRATTR)
                *flagp = ttretf;
        else 
                *flagp = ttattrf;
        return 0;
}

/*
 * Do an nfs setattr rpc.
 */
int
nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
    struct proc *procp)
{
        struct nfsv2_sattr *sp;
        struct nfsm_info        info;
        u_int32_t *tl;
        int error = 0, wccflag = NFSV3_WCCRATTR;
        int v3 = NFS_ISV3(vp);

        info.nmi_v3 = NFS_ISV3(vp);

        nfsstats.rpccnt[NFSPROC_SETATTR]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(v3) + NFSX_SATTR(v3));
        nfsm_fhtom(&info, vp, v3);
        info.nmi_errorp = &error;

        if (info.nmi_v3) {
                nfsm_v3attrbuild(&info.nmi_mb, vap, 1);
                tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
                *tl = nfs_false;
        } else {
                sp = nfsm_build(&info.nmi_mb, NFSX_V2SATTR);
                if (vap->va_mode == (mode_t)VNOVAL)
                        sp->sa_mode = nfs_xdrneg1;
                else
                        sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
                if (vap->va_uid == (uid_t)VNOVAL)
                        sp->sa_uid = nfs_xdrneg1;
                else
                        sp->sa_uid = txdr_unsigned(vap->va_uid);
                if (vap->va_gid == (gid_t)VNOVAL)
                        sp->sa_gid = nfs_xdrneg1;
                else
                        sp->sa_gid = txdr_unsigned(vap->va_gid);
                sp->sa_size = txdr_unsigned(vap->va_size);
                txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
                txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
        }

        info.nmi_procp = procp;
        info.nmi_cred = cred;
        error = nfs_request(vp, NFSPROC_SETATTR, &info);

        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &vp, &wccflag) != 0)
                        goto nfsmout;
        }
        else if (error == 0) {
                if (nfsm_loadattr(&info, &vp, NULL) != 0)
                        goto nfsmout;
        }

        m_freem(info.nmi_mrep);
nfsmout: 
        return (error);
}

static inline nfsfh_t *
nfsm_getfh(struct nfsm_info *infop, int *sizep, int v3)
{
        int size;
        if (v3) {
                uint32_t *tl = (uint32_t *)nfsm_dissect(infop, NFSX_UNSIGNED);
                if (tl == NULL)
                        return NULL;
                size = fxdr_unsigned(int, *tl);
                if (size <= 0 || size > NFSX_V3FHMAX) {
                        m_freem(infop->nmi_mrep);
                        infop->nmi_mrep = NULL;
                        *infop->nmi_errorp = EBADRPC;
                        return NULL;
                }
        } else
                size = NFSX_V2FH;
        *sizep = size;
        return (nfsfh_t *)nfsm_dissect(infop, nfsm_rndup(size));
}

/*
 * nfs lookup call, one step at a time...
 * First look in cache
 * If not found, unlock the directory nfsnode and do the rpc
 */
int
nfs_lookup(void *v)
{
        struct vop_lookup_args *ap = v;
        struct componentname *cnp = ap->a_cnp;
        struct vnode *dvp = ap->a_dvp;
        struct vnode **vpp = ap->a_vpp;
        struct nfsm_info        info;
        int flags;
        struct vnode *newvp;
        struct nfsmount *nmp;
        long len;
        nfsfh_t *fhp;
        struct nfsnode *np;
        int lockparent, wantparent, error = 0, attrflag, fhsize;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        cnp->cn_flags &= ~PDIRUNLOCK;
        flags = cnp->cn_flags;

        *vpp = NULL;
        newvp = NULL;
        if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
            (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
                return (EROFS);
        if (dvp->v_type != VDIR)
                return (ENOTDIR);
        lockparent = flags & LOCKPARENT;
        wantparent = flags & (LOCKPARENT|WANTPARENT);
        nmp = VFSTONFS(dvp->v_mount);
        np = VTONFS(dvp);

        /*
         * Before tediously performing a linear scan of the directory,
         * check the name cache to see if the directory/name pair
         * we are looking for is known already.
         * If the directory/name pair is found in the name cache,
         * we have to ensure the directory has not changed from
         * the time the cache entry has been created. If it has,
         * the cache entry has to be ignored.
         */
        if ((error = cache_lookup(dvp, vpp, cnp)) >= 0) {
                struct vattr vattr;
                int err2;

                if (error && error != ENOENT) {
                        *vpp = NULL;
                        return (error);
                }

                if (cnp->cn_flags & PDIRUNLOCK) {
                        err2 = vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
                        if (err2 != 0) {
                                *vpp = NULL;
                                return (err2);
                        }
                        cnp->cn_flags &= ~PDIRUNLOCK;
                }

                err2 = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_proc);
                if (err2 != 0) {
                        if (error == 0) {
                                if (*vpp != dvp)
                                        vput(*vpp);
                                else
                                        vrele(*vpp);
                        }
                        *vpp = NULL;
                        return (err2);
                }

                if (error == ENOENT) {
                        if (!VOP_GETATTR(dvp, &vattr, cnp->cn_cred,
                            cnp->cn_proc) && vattr.va_mtime.tv_sec ==
                            VTONFS(dvp)->n_ctime)
                                return (ENOENT);
                        cache_purge(dvp);
                        np->n_ctime = 0;
                        goto dorpc;
                }

                newvp = *vpp;
                if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, cnp->cn_proc)
                        && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime)
                {
                        nfsstats.lookupcache_hits++;
                        if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
                                cnp->cn_flags |= SAVENAME;
                        if ((!lockparent || !(flags & ISLASTCN)) &&
                             newvp != dvp) {
                                VOP_UNLOCK(dvp);
                                cnp->cn_flags |= PDIRUNLOCK;
                        }
                        return (0);
                }
                cache_purge(newvp);
                if (newvp != dvp)
                        vput(newvp);
                else
                        vrele(newvp);
                *vpp = NULL;
        }
dorpc:
        error = 0;
        newvp = NULL;
        nfsstats.lookupcache_misses++;
        nfsstats.rpccnt[NFSPROC_LOOKUP]++;
        len = cnp->cn_namelen;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
            NFSX_UNSIGNED + nfsm_rndup(len));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(dvp, NFSPROC_LOOKUP, &info);

        if (error) {
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &dvp, &attrflag) != 0)
                                goto nfsmout;
                }
                m_freem(info.nmi_mrep);
                goto nfsmout;
        }

        if ((fhp = nfsm_getfh(&info, &fhsize, info.nmi_v3)) == NULL)
                goto nfsmout;

        /*
         * Handle RENAME case...
         */
        if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) {
                if (NFS_CMPFH(np, fhp, fhsize)) {
                        m_freem(info.nmi_mrep);
                        return (EISDIR);
                }
                error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
                if (error) {
                        m_freem(info.nmi_mrep);
                        return (error);
                }
                newvp = NFSTOV(np);
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &newvp, &attrflag) != 0)
                                goto nfsmout;
                        if (nfsm_postop_attr(&info, &dvp, &attrflag) != 0)
                                goto nfsmout;
                } else {
                        if (nfsm_loadattr(&info, &newvp, NULL) != 0)
                                goto nfsmout;
                }
                *vpp = newvp;
                m_freem(info.nmi_mrep);
                cnp->cn_flags |= SAVENAME;
                if (!lockparent) {
                        VOP_UNLOCK(dvp);
                        cnp->cn_flags |= PDIRUNLOCK;
                }
                return (0);
        }

        /*
         * The postop attr handling is duplicated for each if case,
         * because it should be done while dvp is locked (unlocking
         * dvp is different for each case).
         */

        if (NFS_CMPFH(np, fhp, fhsize)) {
                vref(dvp);
                newvp = dvp;
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &newvp, &attrflag) != 0)
                                goto nfsmout;
                        if (nfsm_postop_attr(&info, &dvp, &attrflag) != 0)
                                goto nfsmout;
                } else {
                        if (nfsm_loadattr(&info, &newvp, NULL) != 0)
                                goto nfsmout;
                }
        } else if (flags & ISDOTDOT) {
                VOP_UNLOCK(dvp);
                cnp->cn_flags |= PDIRUNLOCK;

                error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
                if (error) {
                        if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) == 0)
                                cnp->cn_flags &= ~PDIRUNLOCK;
                        m_freem(info.nmi_mrep);
                        return (error);
                }
                newvp = NFSTOV(np);

                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &newvp, &attrflag) != 0)
                                goto nfsmout;
                        if (nfsm_postop_attr(&info, &dvp, &attrflag) != 0)
                                goto nfsmout;
                } else {
                        if (nfsm_loadattr(&info, &newvp, NULL) != 0)
                                goto nfsmout;
                }

                if (lockparent && (flags & ISLASTCN)) {
                        if ((error = vn_lock(dvp, LK_EXCLUSIVE))) {
                                m_freem(info.nmi_mrep);
                                vput(newvp);
                                return error;
                        }
                        cnp->cn_flags &= ~PDIRUNLOCK;
                }

        } else {
                error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
                if (error) {
                        m_freem(info.nmi_mrep);
                        return error;
                }
                newvp = NFSTOV(np);
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &newvp, &attrflag) != 0)
                                goto nfsmout;
                        if (nfsm_postop_attr(&info, &dvp, &attrflag) != 0)
                                goto nfsmout;
                } else {
                        if (nfsm_loadattr(&info, &newvp, NULL) != 0)
                                goto nfsmout;
                }
                if (!lockparent || !(flags & ISLASTCN)) {
                        VOP_UNLOCK(dvp);
                        cnp->cn_flags |= PDIRUNLOCK;
                }
        }

        if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
                cnp->cn_flags |= SAVENAME;
        if ((cnp->cn_flags & MAKEENTRY) &&
            (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
                nfs_cache_enter(dvp, newvp, cnp);
        }

        *vpp = newvp;
        m_freem(info.nmi_mrep);

nfsmout: 
        if (error) {
                /*
                 * We get here only because of errors returned by the RPC.
                 * Otherwise we'd already have returned.
                 */
                if (error == ENOENT && (cnp->cn_flags & MAKEENTRY) &&
                    cnp->cn_nameiop != CREATE) {
                        nfs_cache_enter(dvp, NULL, cnp);
                }
                if (newvp != NULL) {
                        if (newvp != dvp)
                                vput(newvp);
                        else
                                vrele(newvp);
                }
                if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
                    (flags & ISLASTCN) && error == ENOENT) {
                        if (dvp->v_mount->mnt_flag & MNT_RDONLY)
                                error = EROFS;
                        else
                                error = EJUSTRETURN;
                }
                if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
                        cnp->cn_flags |= SAVENAME;
                *vpp = NULL;
        }
        return (error);
}

/*
 * nfs read call.
 * Just call nfs_bioread() to do the work.
 */
int
nfs_read(void *v)
{
        struct vop_read_args *ap = v;
        struct vnode *vp = ap->a_vp;

        if (vp->v_type != VREG)
                return (EPERM);
        return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
}

/*
 * nfs readlink call
 */
int
nfs_readlink(void *v)
{
        struct vop_readlink_args *ap = v;
        struct vnode *vp = ap->a_vp;

        if (vp->v_type != VLNK)
                return (EPERM);
        return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
}

/*
 * Lock an inode.
 */
int
nfs_lock(void *v)
{
        struct vop_lock_args *ap = v;
        struct vnode *vp = ap->a_vp;

        return rrw_enter(&VTONFS(vp)->n_lock, ap->a_flags & LK_RWFLAGS);
}

/*
 * Unlock an inode.
 */
int
nfs_unlock(void *v)
{
        struct vop_unlock_args *ap = v;
        struct vnode *vp = ap->a_vp;

        rrw_exit(&VTONFS(vp)->n_lock);
        return 0;
}

/*
 * Check for a locked inode.
 */
int
nfs_islocked(void *v)
{
        struct vop_islocked_args *ap = v;

        return rrw_status(&VTONFS(ap->a_vp)->n_lock);
}

/*
 * Do a readlink rpc.
 * Called by nfs_doio() from below the buffer cache.
 */
int
nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
        struct nfsm_info        info;
        int error = 0, len, attrflag;

        info.nmi_v3 = NFS_ISV3(vp);
        info.nmi_errorp = &error;

        nfsstats.rpccnt[NFSPROC_READLINK]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3));
        nfsm_fhtom(&info, vp, info.nmi_v3);

        info.nmi_procp = curproc;
        info.nmi_cred = cred;
        error = nfs_request(vp, NFSPROC_READLINK, &info);

        if (info.nmi_v3) {
                if (nfsm_postop_attr(&info, &vp, &attrflag) != 0)
                        goto nfsmout;
        }
        if (!error) {
                if (nfsm_strsiz(&info, &len, NFS_MAXPATHLEN) != 0)
                        goto nfsmout;
                if (nfsm_mtouio(&info, uiop, len) != 0)
                        goto nfsmout;
        }

        m_freem(info.nmi_mrep);

nfsmout: 
        return (error);
}

/*
 * nfs read rpc call
 * Ditto above
 */
int
nfs_readrpc(struct vnode *vp, struct uio *uiop)
{
        struct nfsm_info        info;
        u_int32_t *tl;
        struct nfsmount *nmp;
        int error = 0, len, retlen, tsiz, eof, attrflag;

        info.nmi_v3 = NFS_ISV3(vp);
        info.nmi_errorp = &error;

        eof = 0;

        nmp = VFSTONFS(vp->v_mount);
        tsiz = uiop->uio_resid;
        if (uiop->uio_offset + tsiz > 0xffffffff && !info.nmi_v3)
                return (EFBIG);
        while (tsiz > 0) {
                nfsstats.rpccnt[NFSPROC_READ]++;
                len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
                info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
                    NFSX_UNSIGNED * 3);
                nfsm_fhtom(&info, vp, info.nmi_v3);
                tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED * 3);
                if (info.nmi_v3) {
                        txdr_hyper(uiop->uio_offset, tl);
                        *(tl + 2) = txdr_unsigned(len);
                } else {
                        *tl++ = txdr_unsigned(uiop->uio_offset);
                        *tl++ = txdr_unsigned(len);
                        *tl = 0;
                }

                info.nmi_procp = curproc;
                info.nmi_cred = VTONFS(vp)->n_rcred;
                error = nfs_request(vp, NFSPROC_READ, &info);
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &vp, &attrflag) != 0)
                                goto nfsmout;
                }
                if (error) {
                        m_freem(info.nmi_mrep);
                        goto nfsmout;
                }

                if (info.nmi_v3) {
                        tl = (uint32_t *)nfsm_dissect(&info, 2 * NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        eof = fxdr_unsigned(int, *(tl + 1));
                } else {
                        if (nfsm_loadattr(&info, &vp, NULL) != 0)
                                goto nfsmout;
                }

                if (nfsm_strsiz(&info, &retlen, nmp->nm_rsize) != 0)
                        goto nfsmout;
                if (nfsm_mtouio(&info, uiop, retlen) != 0)
                        goto nfsmout;
                m_freem(info.nmi_mrep);
                tsiz -= retlen;
                if (info.nmi_v3) {
                        if (eof || retlen == 0)
                                tsiz = 0;
                } else if (retlen < len)
                        tsiz = 0;
        }

nfsmout:
        return (error);
}

/*
 * nfs write call
 */
int
nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, int *must_commit)
{
        struct nfsm_info        info;
        u_int32_t *tl;
        int32_t backup;
        struct nfsmount *nmp = VFSTONFS(vp->v_mount);
        int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
        int committed = NFSV3WRITE_FILESYNC;

        info.nmi_v3 = NFS_ISV3(vp);
        info.nmi_errorp = &error;

#ifdef DIAGNOSTIC
        if (uiop->uio_iovcnt != 1)
                panic("nfs: writerpc iovcnt > 1");
#endif
        *must_commit = 0;
        tsiz = uiop->uio_resid;
        if (uiop->uio_offset + tsiz > 0xffffffff && !info.nmi_v3)
                return (EFBIG);
        while (tsiz > 0) {
                nfsstats.rpccnt[NFSPROC_WRITE]++;
                len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
                info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)
                    + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
                nfsm_fhtom(&info, vp, info.nmi_v3);
                if (info.nmi_v3) {
                        tl = nfsm_build(&info.nmi_mb, 5 * NFSX_UNSIGNED);
                        txdr_hyper(uiop->uio_offset, tl);
                        tl += 2;
                        *tl++ = txdr_unsigned(len);
                        *tl++ = txdr_unsigned(*iomode);
                        *tl = txdr_unsigned(len);
                } else {
                        u_int32_t x;

                        tl = nfsm_build(&info.nmi_mb, 4 * NFSX_UNSIGNED);
                        /* Set both "begin" and "current" to non-garbage. */
                        x = txdr_unsigned((u_int32_t)uiop->uio_offset);
                        *tl++ = x;      /* "begin offset" */
                        *tl++ = x;      /* "current offset" */
                        x = txdr_unsigned(len);
                        *tl++ = x;      /* total to this offset */
                        *tl = x;        /* size of this write */

                }
                nfsm_uiotombuf(&info.nmi_mb, uiop, len);

                info.nmi_procp = curproc;
                info.nmi_cred = VTONFS(vp)->n_wcred;
                error = nfs_request(vp, NFSPROC_WRITE, &info);
                if (info.nmi_v3) {
                        wccflag = NFSV3_WCCCHK;
                        if (nfsm_wcc_data(&info, &vp, &wccflag) != 0)
                                goto nfsmout;
                }

                if (error) {
                        m_freem(info.nmi_mrep);
                        goto nfsmout;
                }

                if (info.nmi_v3) {
                        wccflag = NFSV3_WCCCHK;
                        tl = (uint32_t *)nfsm_dissect(&info,
                            2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF);
                        if (tl == NULL)
                                goto nfsmout;
                        rlen = fxdr_unsigned(int, *tl++);
                        if (rlen <= 0) {
                                error = NFSERR_IO;
                                break;
                        } else if (rlen < len) {
                                backup = len - rlen;
                                uiop->uio_iov->iov_base =
                                    (char *)uiop->uio_iov->iov_base -
                                    backup;
                                uiop->uio_iov->iov_len += backup;
                                uiop->uio_offset -= backup;
                                uiop->uio_resid += backup;
                                len = rlen;
                        }
                        commit = fxdr_unsigned(int, *tl++);

                        /*
                         * Return the lowest commitment level
                         * obtained by any of the RPCs.
                         */
                        if (committed == NFSV3WRITE_FILESYNC)
                                committed = commit;
                        else if (committed == NFSV3WRITE_DATASYNC &&
                                commit == NFSV3WRITE_UNSTABLE)
                                committed = commit;
                        if ((nmp->nm_flag & NFSMNT_HASWRITEVERF) == 0) {
                                bcopy(tl, nmp->nm_verf,
                                    NFSX_V3WRITEVERF);
                                nmp->nm_flag |= NFSMNT_HASWRITEVERF;
                        } else if (bcmp(tl,
                            nmp->nm_verf, NFSX_V3WRITEVERF)) {
                                *must_commit = 1;
                                bcopy(tl, nmp->nm_verf,
                                    NFSX_V3WRITEVERF);
                        }
                } else {
                        if (nfsm_loadattr(&info, &vp, NULL) != 0)
                                goto nfsmout;
                }
                if (wccflag)
                    VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
                m_freem(info.nmi_mrep);
                tsiz -= len;
        }
nfsmout:
        *iomode = committed;
        if (error)
                uiop->uio_resid = tsiz;
        return (error);
}

static inline int
nfsm_mtofh(struct nfsm_info *infop, struct vnode *dvp, struct vnode **vpp,
    int *flagp)
{
        struct nfsnode *ttnp;
        nfsfh_t *ttfhp;
        int ttfhsize;
        uint32_t *tl;
        int error;
        int flag;

        if (infop->nmi_v3) {
                tl = (uint32_t *)nfsm_dissect(infop, NFSX_UNSIGNED);
                if (tl == NULL)
                        return 1;
                flag = fxdr_unsigned(int, *tl);
        } else
                flag = 1;
        if (flag) {
                if ((ttfhp = nfsm_getfh(infop, &ttfhsize, infop->nmi_v3)) ==
                    NULL) {
                        return 1;
                }
                error = nfs_nget(dvp->v_mount, ttfhp, ttfhsize, &ttnp);
                if (error != 0) {
                        m_freem(infop->nmi_mrep);
                        infop->nmi_mrep = NULL;
                        *infop->nmi_errorp = error;
                        return error;
                }
                *vpp = NFSTOV(ttnp);
        }
        if (infop->nmi_v3) {
                tl = (uint32_t *)nfsm_dissect(infop, NFSX_UNSIGNED);
                if (tl == NULL)
                        return 1;
                if (flag)
                        flag = fxdr_unsigned(int, *tl);
                else if (fxdr_unsigned(int, *tl)) {
                        if (nfsm_adv(infop, NFSX_V3FATTR) != 0)
                                return 1;
                }
        }
        if (flag) {
                if (nfsm_loadattr(infop, vpp, NULL) != 0)
                        return 1;
        }
        *flagp = flag;
        return 0;
}

/*
 * nfs mknod rpc
 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 * mode set to specify the file type and the size field for rdev.
 */
int
nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
    struct vattr *vap)
{
        struct nfsv2_sattr *sp;
        struct nfsm_info        info;
        u_int32_t *tl;
        struct vnode *newvp = NULL;
        struct nfsnode *np = NULL;
        int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
        u_int32_t rdev;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        if (vap->va_type == VCHR || vap->va_type == VBLK)
                rdev = txdr_unsigned(vap->va_rdev);
        else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
                rdev = nfs_xdrneg1;
        else {
                VOP_ABORTOP(dvp, cnp);
                return (EOPNOTSUPP);
        }
        nfsstats.rpccnt[NFSPROC_MKNOD]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
            4 * NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen) +
            NFSX_SATTR(info.nmi_v3));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen,
            NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        if (info.nmi_v3) {
                tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
                *tl++ = vtonfsv3_type(vap->va_type);
                nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
                if (vap->va_type == VCHR || vap->va_type == VBLK) {
                        tl = nfsm_build(&info.nmi_mb, 2 * NFSX_UNSIGNED);
                        *tl++ = txdr_unsigned(major(vap->va_rdev));
                        *tl = txdr_unsigned(minor(vap->va_rdev));
                }
        } else {
                sp = nfsm_build(&info.nmi_mb, NFSX_V2SATTR);
                sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
                sp->sa_uid = nfs_xdrneg1;
                sp->sa_gid = nfs_xdrneg1;
                sp->sa_size = rdev;
                txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
                txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
        }

        KASSERT(cnp->cn_proc == curproc);
        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(dvp, NFSPROC_MKNOD, &info);
        if (!error) {
                if (nfsm_mtofh(&info, dvp, &newvp, &gotvp) != 0)
                        goto nfsmout;
                if (!gotvp) {
                        error = nfs_lookitup(dvp, cnp->cn_nameptr,
                            cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np);
                        if (!error)
                                newvp = NFSTOV(np);
                }
        }
        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        if (error) {
                if (newvp)
                        vput(newvp);
        } else {
                if (cnp->cn_flags & MAKEENTRY)
                        nfs_cache_enter(dvp, newvp, cnp);
                *vpp = newvp;
        }
        pool_put(&namei_pool, cnp->cn_pnbuf);
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
        return (error);
}

/*
 * nfs mknod vop
 * just call nfs_mknodrpc() to do the work.
 */
int
nfs_mknod(void *v)
{
        struct vop_mknod_args *ap = v;
        struct vnode *newvp;
        int error;

        error = nfs_mknodrpc(ap->a_dvp, &newvp, ap->a_cnp, ap->a_vap);
        if (!error)
                vput(newvp);

        VN_KNOTE(ap->a_dvp, NOTE_WRITE);

        return (error);
}

int
nfs_create(void *v)
{
        struct vop_create_args *ap = v;
        struct vnode *dvp = ap->a_dvp;
        struct vattr *vap = ap->a_vap;
        struct componentname *cnp = ap->a_cnp;
        struct nfsv2_sattr *sp;
        struct nfsm_info        info;
        struct timespec ts;
        u_int32_t *tl;
        struct nfsnode *np = NULL;
        struct vnode *newvp = NULL;
        int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        /*
         * Oops, not for me..
         */
        if (vap->va_type == VSOCK)
                return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));

        if (vap->va_vaflags & VA_EXCLUSIVE)
                fmode |= O_EXCL;

again:
        nfsstats.rpccnt[NFSPROC_CREATE]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
            2 * NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen) +
            NFSX_SATTR(info.nmi_v3));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen,
            NFS_MAXNAMLEN) != 0)
                goto nfsmout;
        if (info.nmi_v3) {
                tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
                if (fmode & O_EXCL) {
                        *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
                        tl = nfsm_build(&info.nmi_mb, NFSX_V3CREATEVERF);
                        arc4random_buf(tl, sizeof(*tl) * 2);
                } else {
                        *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
                        nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
                }
        } else {
                sp = nfsm_build(&info.nmi_mb, NFSX_V2SATTR);
                sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
                sp->sa_uid = nfs_xdrneg1;
                sp->sa_gid = nfs_xdrneg1;
                sp->sa_size = 0;
                txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
                txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
        }

        KASSERT(cnp->cn_proc == curproc);
        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(dvp, NFSPROC_CREATE, &info);
        if (!error) {
                if (nfsm_mtofh(&info, dvp, &newvp, &gotvp) != 0)
                        goto nfsmout;
                if (!gotvp) {
                        error = nfs_lookitup(dvp, cnp->cn_nameptr,
                            cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np);
                        if (!error)
                                newvp = NFSTOV(np);
                }
        }
        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        if (error) {
                if (newvp) {
                        vput(newvp);
                        newvp = NULL;
                }
                if (info.nmi_v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
                        fmode &= ~O_EXCL;
                        goto again;
                }
        } else if (info.nmi_v3 && (fmode & O_EXCL)) {
                getnanotime(&ts);
                if (vap->va_atime.tv_nsec == VNOVAL)
                        vap->va_atime = ts;
                if (vap->va_mtime.tv_nsec == VNOVAL)
                        vap->va_mtime = ts;
                error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_proc);
        }
        if (!error) {
                if (cnp->cn_flags & MAKEENTRY)
                        nfs_cache_enter(dvp, newvp, cnp);
                *ap->a_vpp = newvp;
        }
        pool_put(&namei_pool, cnp->cn_pnbuf);
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
        VN_KNOTE(ap->a_dvp, NOTE_WRITE);
        return (error);
}

/*
 * nfs file remove call
 * To try and make nfs semantics closer to ufs semantics, a file that has
 * other processes using the vnode is renamed instead of removed and then
 * removed later on the last close.
 * - If v_usecount > 1
 *        If a rename is not already in the works
 *           call nfs_sillyrename() to set it up
 *     else
 *        do the remove rpc
 */
int
nfs_remove(void *v)
{
        struct vop_remove_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct vnode *dvp = ap->a_dvp;
        struct componentname *cnp = ap->a_cnp;
        struct nfsnode *np = VTONFS(vp);
        int error = 0;
        struct vattr vattr;

#ifdef DIAGNOSTIC
        if ((cnp->cn_flags & HASBUF) == 0)
                panic("nfs_remove: no name");
        if (vp->v_usecount < 1)
                panic("nfs_remove: bad v_usecount");
#endif
        if (vp->v_type == VDIR)
                error = EPERM;
        else if (vp->v_usecount == 1 || (np->n_sillyrename &&
            VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_proc) == 0 &&
            vattr.va_nlink > 1)) {
                /*
                 * Purge the name cache so that the chance of a lookup for
                 * the name succeeding while the remove is in progress is
                 * minimized. Without node locking it can still happen, such
                 * that an I/O op returns ESTALE, but since you get this if
                 * another host removes the file..
                 */
                cache_purge(vp);
                /*
                 * throw away biocache buffers, mainly to avoid
                 * unnecessary delayed writes later.
                 */
                error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_proc);
                /* Do the rpc */
                if (error != EINTR)
                        error = nfs_removerpc(dvp, cnp->cn_nameptr,
                                cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc);
                /*
                 * Kludge City: If the first reply to the remove rpc is lost..
                 *   the reply to the retransmitted request will be ENOENT
                 *   since the file was in fact removed
                 *   Therefore, we cheat and return success.
                 */
                if (error == ENOENT)
                        error = 0;
        } else if (!np->n_sillyrename)
                error = nfs_sillyrename(dvp, vp, cnp);
        pool_put(&namei_pool, cnp->cn_pnbuf);
        NFS_INVALIDATE_ATTRCACHE(np);
        VN_KNOTE(vp, NOTE_DELETE);
        VN_KNOTE(dvp, NOTE_WRITE);
        return (error);
}

/*
 * nfs file remove rpc called from nfs_inactive
 */
int
nfs_removeit(struct sillyrename *sp)
{
        KASSERT(VOP_ISLOCKED(sp->s_dvp));
        /*
         * Make sure that the directory vnode is still valid.
         *
         * NFS can potentially try to nuke a silly *after* the directory
         * has already been pushed out on a forced unmount. Since the silly
         * is going to go away anyway, this is fine.
         */
        if (sp->s_dvp->v_type == VBAD)
                return (0);
        return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
                NULL));
}

/*
 * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
 */
int
nfs_removerpc(struct vnode *dvp, char *name, int namelen, struct ucred *cred,
    struct proc *proc)
{
        struct nfsm_info        info;
        int error = 0, wccflag = NFSV3_WCCRATTR;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        nfsstats.rpccnt[NFSPROC_REMOVE]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
             NFSX_UNSIGNED + nfsm_rndup(namelen));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, name, namelen, NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        info.nmi_procp = proc;
        info.nmi_cred = cred;
        error = nfs_request(dvp, NFSPROC_REMOVE, &info);
        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
        return (error);
}

/*
 * nfs file rename call
 */
int
nfs_rename(void *v)
{
        struct vop_rename_args  *ap = v;
        struct vnode *fvp = ap->a_fvp;
        struct vnode *tvp = ap->a_tvp;
        struct vnode *fdvp = ap->a_fdvp;
        struct vnode *tdvp = ap->a_tdvp;
        struct componentname *tcnp = ap->a_tcnp;
        struct componentname *fcnp = ap->a_fcnp;
        int error;

#ifdef DIAGNOSTIC
        if ((tcnp->cn_flags & HASBUF) == 0 ||
            (fcnp->cn_flags & HASBUF) == 0)
                panic("nfs_rename: no name");
#endif
        /* Check for cross-device rename */
        if ((fvp->v_mount != tdvp->v_mount) ||
            (tvp && (fvp->v_mount != tvp->v_mount))) {
                error = EXDEV;
                goto out;
        }

        /*
         * If the tvp exists and is in use, sillyrename it before doing the
         * rename of the new file over it.
         */
        if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
            tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
                VN_KNOTE(tvp, NOTE_DELETE);
                vput(tvp);
                tvp = NULL;
        }

        error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
                tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
                tcnp->cn_proc);

        VN_KNOTE(fdvp, NOTE_WRITE);
        VN_KNOTE(tdvp, NOTE_WRITE);

        if (fvp->v_type == VDIR) {
                if (tvp != NULL && tvp->v_type == VDIR)
                        cache_purge(tdvp);
                cache_purge(fdvp);
        }
out:
        if (tdvp == tvp)
                vrele(tdvp);
        else
                vput(tdvp);
        if (tvp)
                vput(tvp);
        vrele(fdvp);
        vrele(fvp);
        /*
         * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
         */
        if (error == ENOENT)
                error = 0;
        return (error);
}

/*
 * nfs file rename rpc called from nfs_remove() above
 */
int
nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
    struct sillyrename *sp)
{
        return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
                sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curproc));
}

/*
 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 */
int
nfs_renamerpc(struct vnode *fdvp, char *fnameptr, int fnamelen,
    struct vnode *tdvp, char *tnameptr, int tnamelen, struct ucred *cred,
    struct proc *proc)
{
        struct nfsm_info        info;
        int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;

        info.nmi_v3 = NFS_ISV3(fdvp);
        info.nmi_errorp = &error;

        nfsstats.rpccnt[NFSPROC_RENAME]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead((NFSX_FH(info.nmi_v3) +
            NFSX_UNSIGNED) * 2 + nfsm_rndup(fnamelen) + nfsm_rndup(tnamelen));
        nfsm_fhtom(&info, fdvp, info.nmi_v3);
        if (nfsm_strtom(&info, fnameptr, fnamelen, NFS_MAXNAMLEN) != 0)
                goto nfsmout;
        nfsm_fhtom(&info, tdvp, info.nmi_v3);
        if (nfsm_strtom(&info, tnameptr, tnamelen, NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        info.nmi_procp = proc;
        info.nmi_cred = cred;
        error = nfs_request(fdvp, NFSPROC_RENAME, &info);
        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &fdvp, &fwccflag) != 0)
                        goto nfsmout;
                if (nfsm_wcc_data(&info, &tdvp, &twccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        VTONFS(fdvp)->n_flag |= NMODIFIED;
        VTONFS(tdvp)->n_flag |= NMODIFIED;
        if (!fwccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp));
        if (!twccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp));
        return (error);
}

/*
 * nfs hard link create call
 */
int
nfs_link(void *v)
{
        struct vop_link_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct vnode *dvp = ap->a_dvp;
        struct componentname *cnp = ap->a_cnp;
        struct nfsm_info        info;
        int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;

        info.nmi_v3 = NFS_ISV3(vp);
        info.nmi_errorp = &error;

        error = vn_lock(vp, LK_EXCLUSIVE);
        if (error != 0) {
                VOP_ABORTOP(dvp, cnp);
                vput(dvp);
                return (error);
        }

        /*
         * Push all writes to the server, so that the attribute cache
         * doesn't get "out of sync" with the server.
         * XXX There should be a better way!
         */
        VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_proc);

        nfsstats.rpccnt[NFSPROC_LINK]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(2 * NFSX_FH(info.nmi_v3) +
            NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
        nfsm_fhtom(&info, vp, info.nmi_v3);
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen,
            NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(vp, NFSPROC_LINK, &info);
        if (info.nmi_v3) {
                if (nfsm_postop_attr(&info, &vp, &attrflag) != 0)
                        goto nfsmout;
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);
nfsmout: 
        pool_put(&namei_pool, cnp->cn_pnbuf);
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!attrflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(vp));
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));

        VN_KNOTE(vp, NOTE_LINK);
        VN_KNOTE(dvp, NOTE_WRITE);
        VOP_UNLOCK(vp);
        vput(dvp);
        return (error);
}

/*
 * nfs symbolic link create call
 */
int
nfs_symlink(void *v)
{
        struct vop_symlink_args *ap = v;
        struct vnode *dvp = ap->a_dvp;
        struct vattr *vap = ap->a_vap;
        struct componentname *cnp = ap->a_cnp;
        struct nfsv2_sattr *sp;
        struct nfsm_info        info;
        int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
        struct vnode *newvp = NULL;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        nfsstats.rpccnt[NFSPROC_SYMLINK]++;
        slen = strlen(ap->a_target);
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
            2 * NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) +
            NFSX_SATTR(info.nmi_v3));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen,
            NFS_MAXNAMLEN) != 0)
                goto nfsmout;
        if (info.nmi_v3)
                nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
        if (nfsm_strtom(&info, ap->a_target, slen, NFS_MAXPATHLEN) != 0)
                goto nfsmout;
        if (!info.nmi_v3) {
                sp = nfsm_build(&info.nmi_mb, NFSX_V2SATTR);
                sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
                sp->sa_uid = nfs_xdrneg1;
                sp->sa_gid = nfs_xdrneg1;
                sp->sa_size = nfs_xdrneg1;
                txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
                txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
        }

        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(dvp, NFSPROC_SYMLINK, &info);
        if (info.nmi_v3) {
                if (!error) {
                        if (nfsm_mtofh(&info, dvp, &newvp, &gotvp) != 0)
                                goto nfsmout;
                }
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        if (newvp)
                vput(newvp);
        pool_put(&namei_pool, cnp->cn_pnbuf);
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
        VN_KNOTE(dvp, NOTE_WRITE);
        vput(dvp);
        return (error);
}

/*
 * nfs make dir call
 */
int
nfs_mkdir(void *v)
{
        struct vop_mkdir_args *ap = v;
        struct vnode *dvp = ap->a_dvp;
        struct vattr *vap = ap->a_vap;
        struct componentname *cnp = ap->a_cnp;
        struct nfsv2_sattr *sp;
        struct nfsm_info        info;
        int len;
        struct nfsnode *np = NULL;
        struct vnode *newvp = NULL;
        int error = 0, wccflag = NFSV3_WCCRATTR;
        int gotvp = 0;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        len = cnp->cn_namelen;
        nfsstats.rpccnt[NFSPROC_MKDIR]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
            NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(info.nmi_v3));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        if (info.nmi_v3) {
                nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
        } else {
                sp = nfsm_build(&info.nmi_mb, NFSX_V2SATTR);
                sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
                sp->sa_uid = nfs_xdrneg1;
                sp->sa_gid = nfs_xdrneg1;
                sp->sa_size = nfs_xdrneg1;
                txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
                txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
        }

        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(dvp, NFSPROC_MKDIR, &info);
        if (!error) {
                if (nfsm_mtofh(&info, dvp, &newvp, &gotvp) != 0)
                        goto nfsmout;
        }
        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));

        if (error == 0 && newvp == NULL) {
                error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
                        cnp->cn_proc, &np);
                if (!error) {
                        newvp = NFSTOV(np);
                        if (newvp->v_type != VDIR)
                                error = EEXIST;
                }
        }
        if (error) {
                if (newvp)
                        vput(newvp);
        } else {
                VN_KNOTE(dvp, NOTE_WRITE|NOTE_LINK);
                if (cnp->cn_flags & MAKEENTRY)
                        nfs_cache_enter(dvp, newvp, cnp);
                *ap->a_vpp = newvp;
        }
        pool_put(&namei_pool, cnp->cn_pnbuf);
        vput(dvp);
        return (error);
}

/*
 * nfs remove directory call
 */
int
nfs_rmdir(void *v)
{
        struct vop_rmdir_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct vnode *dvp = ap->a_dvp;
        struct componentname *cnp = ap->a_cnp;
        struct nfsm_info        info;
        int error = 0, wccflag = NFSV3_WCCRATTR;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        nfsstats.rpccnt[NFSPROC_RMDIR]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
            NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen,
            NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        info.nmi_procp = cnp->cn_proc;
        info.nmi_cred = cnp->cn_cred;
        error = nfs_request(dvp,  NFSPROC_RMDIR, &info);
        if (info.nmi_v3) {
                if (nfsm_wcc_data(&info, &dvp, &wccflag) != 0)
                        goto nfsmout;
        }
        m_freem(info.nmi_mrep);

nfsmout: 
        pool_put(&namei_pool, cnp->cn_pnbuf);
        VTONFS(dvp)->n_flag |= NMODIFIED;
        if (!wccflag)
                NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));

        VN_KNOTE(dvp, NOTE_WRITE|NOTE_LINK);
        VN_KNOTE(vp, NOTE_DELETE);

        cache_purge(vp);
        vput(vp);
        vput(dvp);
        /*
         * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
         */
        if (error == ENOENT)
                error = 0;
        return (error);
}


/*
 * The readdir logic below has a big design bug. It stores the NFS cookie in 
 * the returned uio->uio_offset but does not store the verifier (it cannot).
 * Instead, the code stores the verifier in the nfsnode and applies that
 * verifies to all cookies, no matter what verifier was originally with
 * the cookie.
 *
 * From a practical standpoint, this is not a problem since almost all
 * NFS servers do not change the validity of cookies across deletes
 * and inserts.
 */

struct nfs_dirent {
        u_int32_t cookie[2];
        struct dirent dirent;
};

#define NFS_DIRHDSIZ    (sizeof (struct nfs_dirent) - (MAXNAMLEN + 1))
#define NFS_DIRENT_OVERHEAD  offsetof(struct nfs_dirent, dirent)

/*
 * nfs readdir call
 */
int
nfs_readdir(void *v)
{
        struct vop_readdir_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        struct uio *uio = ap->a_uio;
        int tresid, error = 0;
        struct vattr vattr;
        int cnt;
        u_int64_t  newoff = uio->uio_offset;
        struct nfsmount *nmp = VFSTONFS(vp->v_mount);
        struct uio readdir_uio;
        struct iovec readdir_iovec;
        struct proc * p = uio->uio_procp;
        int done = 0, eof = 0;
        struct ucred *cred = ap->a_cred;
        void *data;

        if (vp->v_type != VDIR)
                return (EPERM);
        /*
         * First, check for hit on the EOF offset cache
         */
        if (np->n_direofoffset != 0 && 
            uio->uio_offset == np->n_direofoffset) {
                if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_procp) == 0 &&
                    timespeccmp(&np->n_mtime, &vattr.va_mtime, ==)) {
                        nfsstats.direofcache_hits++;
                        *ap->a_eofflag = 1;
                        return (0);
                }
        }

        if (uio->uio_resid < NFS_FABLKSIZE)
                return (EINVAL);

        tresid = uio->uio_resid;

        if (uio->uio_rw != UIO_READ)
                return (EINVAL);

        if ((nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_GOTFSINFO)) == NFSMNT_NFSV3)
                (void)nfs_fsinfo(nmp, vp, cred, p);

        cnt = 5;

        /* M_ZERO to avoid leaking kernel data in dirent padding */
        data = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK|M_ZERO);
        do {
                struct nfs_dirent *ndp = data;

                readdir_iovec.iov_len = NFS_DIRBLKSIZ;
                readdir_iovec.iov_base = data;
                readdir_uio.uio_offset = newoff;
                readdir_uio.uio_iov = &readdir_iovec;
                readdir_uio.uio_iovcnt = 1;
                readdir_uio.uio_segflg = UIO_SYSSPACE;
                readdir_uio.uio_rw = UIO_READ;
                readdir_uio.uio_resid = NFS_DIRBLKSIZ;
                readdir_uio.uio_procp = curproc;

                if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
                        error = nfs_readdirplusrpc(vp, &readdir_uio, cred,
                            &eof, p);
                        if (error == NFSERR_NOTSUPP)
                                nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
                }
                if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
                        error = nfs_readdirrpc(vp, &readdir_uio, cred, &eof);

                if (error == NFSERR_BAD_COOKIE)
                        error = EINVAL;

                while (error == 0 &&
                    ndp < (struct nfs_dirent *)readdir_iovec.iov_base) {
                        struct dirent *dp = &ndp->dirent;
                        int reclen = dp->d_reclen;

                        dp->d_reclen -= NFS_DIRENT_OVERHEAD;
                        dp->d_off = fxdr_hyper(&ndp->cookie[0]);

                        if (memchr(dp->d_name, '/', dp->d_namlen) != NULL) {
                                error = EBADRPC;
                                break;
                        }

                        if (uio->uio_resid < dp->d_reclen) {
                                eof = 0;
                                done = 1;
                                break;
                        }

                        if ((error = uiomove(dp, dp->d_reclen, uio)))
                                break;

                        newoff = fxdr_hyper(&ndp->cookie[0]);

                        ndp = (struct nfs_dirent *)((u_int8_t *)ndp + reclen);
                }
        } while (!error && !done && !eof && cnt--);

        free(data, M_TEMP, NFS_DIRBLKSIZ);
        data = NULL;

        uio->uio_offset = newoff;

        if (!error && (eof || uio->uio_resid == tresid)) {
                nfsstats.direofcache_misses++;
                *ap->a_eofflag = 1;
                return (0);
        }

        *ap->a_eofflag = 0;
        return (error);
}


/*
 * The function below stuff the cookies in after the name
 */

/*
 * Readdir rpc call.
 */
int
nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
    int *end_of_directory)
{
        int len, left;
        struct nfs_dirent *ndp = NULL;
        struct dirent *dp = NULL;
        struct nfsm_info        info;
        u_int32_t *tl;
        caddr_t cp;
        nfsuint64 cookie;
        struct nfsmount *nmp = VFSTONFS(vp->v_mount);
        struct nfsnode *dnp = VTONFS(vp);
        u_quad_t fileno;
        int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
        int attrflag;

        info.nmi_v3 = NFS_ISV3(vp);
        info.nmi_errorp = &error;

#ifdef DIAGNOSTIC
        if (uiop->uio_iovcnt != 1 ||
                (uiop->uio_resid & (NFS_DIRBLKSIZ - 1)))
                panic("nfs readdirrpc bad uio");
#endif

        txdr_hyper(uiop->uio_offset, &cookie.nfsuquad[0]);

        /*
         * Loop around doing readdir rpc's of size nm_readdirsize
         * truncated to a multiple of NFS_READDIRBLKSIZ.
         * The stopping criteria is EOF or buffer full.
         */
        while (more_dirs && bigenough) {
                nfsstats.rpccnt[NFSPROC_READDIR]++;
                info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)
                    + NFSX_READDIR(info.nmi_v3));
                nfsm_fhtom(&info, vp, info.nmi_v3);
                if (info.nmi_v3) {
                        tl = nfsm_build(&info.nmi_mb, 5 * NFSX_UNSIGNED);
                        *tl++ = cookie.nfsuquad[0];
                        *tl++ = cookie.nfsuquad[1];
                        if (cookie.nfsuquad[0] == 0 &&
                            cookie.nfsuquad[1] == 0) {
                                *tl++ = 0;
                                *tl++ = 0;
                        } else {
                                *tl++ = dnp->n_cookieverf.nfsuquad[0];
                                *tl++ = dnp->n_cookieverf.nfsuquad[1];
                        }
                } else {
                        tl = nfsm_build(&info.nmi_mb, 2 * NFSX_UNSIGNED);
                        *tl++ = cookie.nfsuquad[1];
                }
                *tl = txdr_unsigned(nmp->nm_readdirsize);

                info.nmi_procp = uiop->uio_procp;
                info.nmi_cred = cred;
                error = nfs_request(vp, NFSPROC_READDIR, &info);
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &vp, &attrflag) != 0)
                                goto nfsmout;
                }

                if (error) {
                        m_freem(info.nmi_mrep);
                        goto nfsmout;
                }

                if (info.nmi_v3) {
                        tl = (uint32_t *)nfsm_dissect(&info, 2 * NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        dnp->n_cookieverf.nfsuquad[0] = *tl++;
                        dnp->n_cookieverf.nfsuquad[1] = *tl;
                }

                tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED);
                if (tl == NULL)
                        goto nfsmout;
                more_dirs = fxdr_unsigned(int, *tl);

                /* loop thru the dir entries, doctoring them to dirent form */
                while (more_dirs && bigenough) {
                        if (info.nmi_v3) {
                                tl = (uint32_t *)nfsm_dissect(&info,
                                    3 * NFSX_UNSIGNED);
                                if (tl == NULL)
                                        goto nfsmout;
                                fileno = fxdr_hyper(tl);
                                len = fxdr_unsigned(int, *(tl + 2));
                        } else {
                                tl = (uint32_t *)nfsm_dissect(&info,
                                    2 * NFSX_UNSIGNED);
                                if (tl == NULL)
                                        goto nfsmout;
                                fileno = fxdr_unsigned(u_quad_t, *tl++);
                                len = fxdr_unsigned(int, *tl);
                        }
                        if (len <= 0 || len > NFS_MAXNAMLEN) {
                                error = EBADRPC;
                                m_freem(info.nmi_mrep);
                                goto nfsmout;
                        }
                        tlen = DIRENT_RECSIZE(len) + NFS_DIRENT_OVERHEAD;
                        left = NFS_READDIRBLKSIZ - blksiz;
                        if (tlen > left) {
                                dp->d_reclen += left;
                                uiop->uio_iov->iov_base += left;
                                uiop->uio_iov->iov_len -= left;
                                uiop->uio_resid -= left;
                                blksiz = 0;
                        }
                        if (tlen > uiop->uio_resid)
                                bigenough = 0;
                        if (bigenough) {
                                ndp = (struct nfs_dirent *)
                                    uiop->uio_iov->iov_base;
                                dp = &ndp->dirent;
                                dp->d_fileno = fileno;
                                dp->d_namlen = len;
                                dp->d_reclen = tlen;
                                dp->d_type = DT_UNKNOWN;
                                blksiz += tlen;
                                if (blksiz == NFS_READDIRBLKSIZ)
                                        blksiz = 0;
                                uiop->uio_resid -= NFS_DIRHDSIZ;
                                uiop->uio_iov->iov_base =
                                    (char *)uiop->uio_iov->iov_base +
                                    NFS_DIRHDSIZ;
                                uiop->uio_iov->iov_len -= NFS_DIRHDSIZ;
                                if (nfsm_mtouio(&info, uiop, len) != 0)
                                        goto nfsmout;
                                cp = uiop->uio_iov->iov_base;
                                tlen -= NFS_DIRHDSIZ + len;
                                *cp = '\0';     /* null terminate */
                                uiop->uio_iov->iov_base += tlen;
                                uiop->uio_iov->iov_len -= tlen;
                                uiop->uio_resid -= tlen;
                        } else {
                                if (nfsm_adv(&info, nfsm_rndup(len)) != 0)
                                        goto nfsmout;
                        }
                        if (info.nmi_v3) {
                                tl = (uint32_t *)nfsm_dissect(&info,
                                    3 * NFSX_UNSIGNED);
                        } else {
                                tl = (uint32_t *)nfsm_dissect(&info,
                                    2 * NFSX_UNSIGNED);
                        }
                        if (tl == NULL)
                                goto nfsmout;
                        if (bigenough) {
                                if (info.nmi_v3) {
                                        ndp->cookie[0] = cookie.nfsuquad[0] =
                                            *tl++;
                                } else
                                        ndp->cookie[0] = 0;

                                ndp->cookie[1] = cookie.nfsuquad[1] = *tl++;
                        } else if (info.nmi_v3)
                                tl += 2;
                        else
                                tl++;
                        more_dirs = fxdr_unsigned(int, *tl);
                }
                /*
                 * If at end of rpc data, get the eof boolean
                 */
                if (!more_dirs) {
                        tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        more_dirs = (fxdr_unsigned(int, *tl) == 0);
                }
                m_freem(info.nmi_mrep);
        }
        /*
         * Fill last record, iff any, out to a multiple of NFS_READDIRBLKSIZ
         * by increasing d_reclen for the last record.
         */
        if (blksiz > 0) {
                left = NFS_READDIRBLKSIZ - blksiz;
                dp->d_reclen += left;
                uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base +
                    left;
                uiop->uio_iov->iov_len -= left;
                uiop->uio_resid -= left;
        }

        /*
         * We are now either at the end of the directory or have filled the
         * block.
         */
        if (bigenough) {
                dnp->n_direofoffset = fxdr_hyper(&cookie.nfsuquad[0]);
                if (end_of_directory) *end_of_directory = 1;
        } else {
                if (uiop->uio_resid > 0)
                        printf("EEK! readdirrpc resid > 0\n");
        }

nfsmout:
        return (error);
}

/*
 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
 */
int
nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
    int *end_of_directory, struct proc *p)
{
        int len, left;
        struct nfs_dirent *ndirp = NULL;
        struct dirent *dp = NULL;
        struct nfsm_info        info;
        u_int32_t *tl;
        caddr_t cp;
        struct vnode *newvp;
        caddr_t dpossav1, dpossav2;
        struct mbuf *mdsav1, *mdsav2;
        struct nameidata nami, *ndp = &nami;
        struct componentname *cnp = &ndp->ni_cnd;
        nfsuint64 cookie;
        struct nfsmount *nmp = VFSTONFS(vp->v_mount);
        struct nfsnode *dnp = VTONFS(vp), *np;
        nfsfh_t *fhp;
        u_quad_t fileno;
        int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
        int attrflag, fhsize;

#ifdef DIAGNOSTIC
        if (uiop->uio_iovcnt != 1 ||
                (uiop->uio_resid & (NFS_DIRBLKSIZ - 1)))
                panic("nfs readdirplusrpc bad uio");
#endif
        NDINIT(ndp, 0, 0, UIO_SYSSPACE, NULL, p);
        ndp->ni_dvp = vp;
        newvp = NULL;

        txdr_hyper(uiop->uio_offset, &cookie.nfsuquad[0]);

        /*
         * Loop around doing readdir rpc's of size nm_readdirsize
         * truncated to a multiple of NFS_READDIRBLKSIZ.
         * The stopping criteria is EOF or buffer full.
         */
        while (more_dirs && bigenough) {
                nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
                info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1) + 6 * NFSX_UNSIGNED);
                nfsm_fhtom(&info, vp, 1);
                tl = nfsm_build(&info.nmi_mb, 6 * NFSX_UNSIGNED);
                *tl++ = cookie.nfsuquad[0];
                *tl++ = cookie.nfsuquad[1];
                if (cookie.nfsuquad[0] == 0 &&
                    cookie.nfsuquad[1] == 0) {
                        *tl++ = 0;
                        *tl++ = 0;
                } else {
                        *tl++ = dnp->n_cookieverf.nfsuquad[0];
                        *tl++ = dnp->n_cookieverf.nfsuquad[1];
                }
                *tl++ = txdr_unsigned(nmp->nm_readdirsize);
                *tl = txdr_unsigned(nmp->nm_rsize);

                info.nmi_procp = uiop->uio_procp;
                info.nmi_cred = cred;
                info.nmi_errorp = &error;
                error = nfs_request(vp, NFSPROC_READDIRPLUS, &info);
                if (nfsm_postop_attr(&info, &vp, &attrflag) != 0)
                        goto nfsmout;
                if (error) {
                        m_freem(info.nmi_mrep);
                        goto nfsmout;
                }

                tl = (uint32_t *)nfsm_dissect(&info, 3 * NFSX_UNSIGNED);
                if (tl == NULL)
                        goto nfsmout;
                dnp->n_cookieverf.nfsuquad[0] = *tl++;
                dnp->n_cookieverf.nfsuquad[1] = *tl++;
                more_dirs = fxdr_unsigned(int, *tl);

                /* loop thru the dir entries, doctoring them to 4bsd form */
                while (more_dirs && bigenough) {
                        tl = (uint32_t *)nfsm_dissect(&info, 3 * NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        fileno = fxdr_hyper(tl);
                        len = fxdr_unsigned(int, *(tl + 2));
                        if (len <= 0 || len > NFS_MAXNAMLEN) {
                                error = EBADRPC;
                                m_freem(info.nmi_mrep);
                                goto nfsmout;
                        }
                        tlen = DIRENT_RECSIZE(len) + NFS_DIRENT_OVERHEAD;
                        left = NFS_READDIRBLKSIZ - blksiz;
                        if (tlen > left) {
                                dp->d_reclen += left;
                                uiop->uio_iov->iov_base =
                                    (char *)uiop->uio_iov->iov_base + left;
                                uiop->uio_iov->iov_len -= left;
                                uiop->uio_resid -= left;
                                blksiz = 0;
                        }
                        if (tlen > uiop->uio_resid)
                                bigenough = 0;
                        if (bigenough) {
                                ndirp = (struct nfs_dirent *)
                                    uiop->uio_iov->iov_base;
                                dp = &ndirp->dirent;
                                dp->d_fileno = fileno;
                                dp->d_namlen = len;
                                dp->d_reclen = tlen;
                                dp->d_type = DT_UNKNOWN;
                                blksiz += tlen;
                                if (blksiz == NFS_READDIRBLKSIZ)
                                        blksiz = 0;
                                uiop->uio_resid -= NFS_DIRHDSIZ;
                                uiop->uio_iov->iov_base =
                                    (char *)uiop->uio_iov->iov_base +
                                    NFS_DIRHDSIZ;
                                uiop->uio_iov->iov_len -= NFS_DIRHDSIZ;
                                cnp->cn_nameptr = uiop->uio_iov->iov_base;
                                cnp->cn_namelen = len;
                                if (nfsm_mtouio(&info, uiop, len) != 0)
                                        goto nfsmout;
                                cp = uiop->uio_iov->iov_base;
                                tlen -= NFS_DIRHDSIZ + len;
                                *cp = '\0';
                                uiop->uio_iov->iov_base += tlen;
                                uiop->uio_iov->iov_len -= tlen;
                                uiop->uio_resid -= tlen;
                        } else {
                                if (nfsm_adv(&info, nfsm_rndup(len)) != 0)
                                        goto nfsmout;
                        }
                        tl = (uint32_t *)nfsm_dissect(&info, 3 * NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        if (bigenough) {
                                ndirp->cookie[0] = cookie.nfsuquad[0] = *tl++;
                                ndirp->cookie[1] = cookie.nfsuquad[1] = *tl++;
                        } else
                                tl += 2;

                        /*
                         * Since the attributes are before the file handle
                         * (sigh), we must skip over the attributes and then
                         * come back and get them.
                         */
                        attrflag = fxdr_unsigned(int, *tl);
                        if (attrflag) {
                                dpossav1 = info.nmi_dpos;
                                mdsav1 = info.nmi_md;
                                if (nfsm_adv(&info, NFSX_V3FATTR) != 0)
                                        goto nfsmout;
                                tl = (uint32_t *)
                                    nfsm_dissect(&info, NFSX_UNSIGNED);
                                if (tl == NULL)
                                        goto nfsmout;
                                doit = fxdr_unsigned(int, *tl);
                                if (doit) {
                                        if ((fhp =
                                            nfsm_getfh(&info, &fhsize, 1)) ==
                                            NULL)
                                                goto nfsmout;
                                        if (NFS_CMPFH(dnp, fhp, fhsize)) {
                                                vref(vp);
                                                newvp = vp;
                                                np = dnp;
                                        } else {
                                                error = nfs_nget(vp->v_mount,
                                                    fhp, fhsize, &np);
                                                if (error)
                                                        doit = 0;
                                                else
                                                        newvp = NFSTOV(np);
                                        }
                                }
                                if (doit && bigenough) {
                                        dpossav2 = info.nmi_dpos;
                                        info.nmi_dpos = dpossav1;
                                        mdsav2 = info.nmi_md;
                                        info.nmi_md = mdsav1;
                                        if (nfsm_loadattr(&info, &newvp,
                                            NULL) != 0)
                                                goto nfsmout;
                                        info.nmi_dpos = dpossav2;
                                        info.nmi_md = mdsav2;
                                        dp->d_type = IFTODT(
                                                VTTOIF(np->n_vattr.va_type));
                                        if (cnp->cn_namelen <=
                                            NAMECACHE_MAXLEN) {
                                                ndp->ni_vp = newvp;
                                                cache_purge(ndp->ni_dvp);
                                                nfs_cache_enter(ndp->ni_dvp,
                                                    ndp->ni_vp, cnp);
                                        }
                                }
                        } else {
                                /* Just skip over the file handle */
                                tl = (uint32_t *)
                                    nfsm_dissect(&info, NFSX_UNSIGNED);
                                if (tl == NULL)
                                        goto nfsmout;
                                i = fxdr_unsigned(int, *tl);
                                if (i > 0) {
                                        if (nfsm_adv(&info, nfsm_rndup(i)) != 0)
                                                goto nfsmout;
                                }
                        }
                        if (newvp != NULL) {
                                if (newvp == vp)
                                        vrele(newvp);
                                else
                                        vput(newvp);
                                newvp = NULL;
                        }
                        tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        more_dirs = fxdr_unsigned(int, *tl);
                }
                /*
                 * If at end of rpc data, get the eof boolean
                 */
                if (!more_dirs) {
                        tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED);
                        if (tl == NULL)
                                goto nfsmout;
                        more_dirs = (fxdr_unsigned(int, *tl) == 0);
                }
                m_freem(info.nmi_mrep);
        }
        /*
         * Fill last record, iff any, out to a multiple of NFS_READDIRBLKSIZ
         * by increasing d_reclen for the last record.
         */
        if (blksiz > 0) {
                left = NFS_READDIRBLKSIZ - blksiz;
                dp->d_reclen += left;
                uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base +
                    left;
                uiop->uio_iov->iov_len -= left;
                uiop->uio_resid -= left;
        }

        /*
         * We are now either at the end of the directory or have filled the
         * block.
         */
        if (bigenough) {
                dnp->n_direofoffset = fxdr_hyper(&cookie.nfsuquad[0]);
                if (end_of_directory) *end_of_directory = 1;
        } else {
                if (uiop->uio_resid > 0)
                        printf("EEK! readdirplusrpc resid > 0\n");
        }

nfsmout:
        if (newvp != NULL) {
                if (newvp == vp)
                        vrele(newvp);
                else
                        vput(newvp);
        }
        return (error);
}

/*
 * Silly rename. To make the NFS filesystem that is stateless look a little
 * more like the "ufs" a remove of an active vnode is translated to a rename
 * to a funny looking filename that is removed by nfs_inactive on the
 * nfsnode. There is the potential for another process on a different client
 * to create the same funny name between the nfs_lookitup() fails and the
 * nfs_rename() completes, but...
 */
int
nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
        struct sillyrename *sp;
        struct nfsnode *np;
        int error;

        cache_purge(dvp);
        np = VTONFS(vp);
        sp = malloc(sizeof(*sp), M_NFSREQ, M_WAITOK);
        sp->s_cred = crdup(cnp->cn_cred);
        sp->s_dvp = dvp;
        vref(dvp);

        if (vp->v_type == VDIR) {
#ifdef DIAGNOSTIC
                printf("nfs: sillyrename dir\n");
#endif
                error = EINVAL;
                goto bad;
        }

        /* Try lookitups until we get one that isn't there */
        while (1) {
                /* Fudge together a funny name */
                u_int32_t rnd[2];

                arc4random_buf(&rnd, sizeof rnd);
                sp->s_namlen = snprintf(sp->s_name, sizeof sp->s_name,
                    ".nfs%08X%08X", rnd[0], rnd[1]);
                if (sp->s_namlen > sizeof sp->s_name)
                        sp->s_namlen = strlen(sp->s_name);

                if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
                    cnp->cn_proc, NULL))
                        break;
        }

        error = nfs_renameit(dvp, cnp, sp);
        if (error)
                goto bad;
        error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
                cnp->cn_proc, &np);
        np->n_sillyrename = sp;
        return (0);
bad:
        vrele(sp->s_dvp);
        crfree(sp->s_cred);
        free(sp, M_NFSREQ, sizeof(*sp));
        return (error);
}

/*
 * Look up a file name and optionally either update the file handle or
 * allocate an nfsnode, depending on the value of npp.
 * npp == NULL  --> just do the lookup
 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 *                      handled too
 * *npp != NULL --> update the file handle in the vnode
 */
int
nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
    struct proc *procp, struct nfsnode **npp)
{
        struct nfsm_info        info;
        struct vnode *newvp = NULL;
        struct nfsnode *np = NULL, *dnp = VTONFS(dvp);
        int error = 0, fhlen, attrflag = 0;
        nfsfh_t *nfhp;

        info.nmi_v3 = NFS_ISV3(dvp);
        info.nmi_errorp = &error;

        nfsstats.rpccnt[NFSPROC_LOOKUP]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) + NFSX_UNSIGNED +
            nfsm_rndup(len));
        nfsm_fhtom(&info, dvp, info.nmi_v3);
        if (nfsm_strtom(&info, name, len, NFS_MAXNAMLEN) != 0)
                goto nfsmout;

        info.nmi_procp = procp;
        info.nmi_cred = cred;
        error = nfs_request(dvp, NFSPROC_LOOKUP, &info);
        if (error && !info.nmi_v3) {
                m_freem(info.nmi_mrep);
                goto nfsmout;
        }

        if (npp && !error) {
                if ((nfhp = nfsm_getfh(&info, &fhlen, info.nmi_v3)) == NULL)
                        goto nfsmout;
                if (*npp) {
                        np = *npp;
                        np->n_fhp = &np->n_fh;
                        bcopy(nfhp, np->n_fhp, fhlen);
                        np->n_fhsize = fhlen;
                        newvp = NFSTOV(np);
                } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
                        vref(dvp);
                        newvp = dvp;
                        np = dnp;
                } else {
                        error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
                        if (error) {
                                m_freem(info.nmi_mrep);
                                return (error);
                        }
                        newvp = NFSTOV(np);
                }
                if (info.nmi_v3) {
                        if (nfsm_postop_attr(&info, &newvp, &attrflag) != 0)
                                goto nfsmout;
                        if (!attrflag && *npp == NULL) {
                                m_freem(info.nmi_mrep);
                                if (newvp == dvp)
                                        vrele(newvp);
                                else
                                        vput(newvp);
                                return (ENOENT);
                        }
                } else {
                        if (nfsm_loadattr(&info, &newvp, NULL) != 0)
                                goto nfsmout;
                }
        }
        m_freem(info.nmi_mrep);
nfsmout:
        if (npp && *npp == NULL) {
                if (error) {
                        if (newvp == dvp)
                                vrele(newvp);
                        else
                                vput(newvp);
                } else
                        *npp = np;
        }
        return (error);
}

/*
 * Nfs Version 3 commit rpc
 */
int
nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct proc *procp)
{
        struct nfsm_info        info;
        u_int32_t *tl;
        struct nfsmount *nmp = VFSTONFS(vp->v_mount);
        int error = 0, wccflag = NFSV3_WCCRATTR;

        if ((nmp->nm_flag & NFSMNT_HASWRITEVERF) == 0)
                return (0);
        nfsstats.rpccnt[NFSPROC_COMMIT]++;
        info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1));
        nfsm_fhtom(&info, vp, 1);
        info.nmi_errorp = &error;

        tl = nfsm_build(&info.nmi_mb, 3 * NFSX_UNSIGNED);
        txdr_hyper(offset, tl);
        tl += 2;
        *tl = txdr_unsigned(cnt);

        info.nmi_procp = procp;
        info.nmi_cred = VTONFS(vp)->n_wcred;
        error = nfs_request(vp, NFSPROC_COMMIT, &info);
        if (nfsm_wcc_data(&info, &vp, &wccflag) != 0)
                goto nfsmout;

        if (!error) {
                tl = (uint32_t *)nfsm_dissect(&info, NFSX_V3WRITEVERF);
                if (tl == NULL)
                        goto nfsmout;
                if (bcmp(nmp->nm_verf, tl,
                        NFSX_V3WRITEVERF)) {
                        bcopy(tl, nmp->nm_verf,
                                NFSX_V3WRITEVERF);
                        error = NFSERR_STALEWRITEVERF;
                }
        }
        m_freem(info.nmi_mrep);

nfsmout:
        return (error);
}

/*
 * Kludge City..
 * - make nfs_bmap() essentially a no-op that does no translation
 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc
 *   (Maybe I could use the process's page mapping, but I was concerned that
 *    Kernel Write might not be enabled and also figured copyout() would do
 *    a lot more work than bcopy() and also it currently happens in the
 *    context of the swapper process (2).
 */
int
nfs_bmap(void *v)
{
        struct vop_bmap_args *ap = v;
        struct vnode *vp = ap->a_vp;

        if (ap->a_vpp != NULL)
                *ap->a_vpp = vp;
        if (ap->a_bnp != NULL)
                *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize);
        return (0);
}

/*
 * Strategy routine.
 * For async requests when nfsiod(s) are running, queue the request by
 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
 * request.
 */
int
nfs_strategy(void *v)
{
        struct vop_strategy_args *ap = v;
        struct buf *bp = ap->a_bp;
        struct proc *p;
        int error = 0;

        if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC))
                panic("nfs physio/async");
        if (bp->b_flags & B_ASYNC)
                p = NULL;
        else
                p = curproc;    /* XXX */
        /*
         * If the op is asynchronous and an i/o daemon is waiting
         * queue the request, wake it up and wait for completion
         * otherwise just do it ourselves.
         */
        if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp, 0))
                error = nfs_doio(bp, p);
        return (error);
}

/*
 * fsync vnode op. Just call nfs_flush() with commit == 1.
 */
int
nfs_fsync(void *v)
{
        struct vop_fsync_args *ap = v;

        return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_p, 1));
}

/*
 * Flush all the blocks associated with a vnode.
 *      Walk through the buffer pool and push any dirty pages
 *      associated with the vnode.
 */
int
nfs_flush(struct vnode *vp, struct ucred *cred, int waitfor, struct proc *p,
    int commit)
{
        struct nfsnode *np = VTONFS(vp);
        struct buf *bp;
        int i;
        struct buf *nbp;
        struct nfsmount *nmp = VFSTONFS(vp->v_mount);
        uint64_t slptimeo = INFSLP;
        int s, error = 0, slpflag = 0, retv, bvecpos;
        int dirty, passone = 1;
        u_quad_t off = (u_quad_t)-1, endoff = 0, toff;
#ifndef NFS_COMMITBVECSIZ
#define NFS_COMMITBVECSIZ       20
#endif
        struct buf *bvec[NFS_COMMITBVECSIZ];

        if (nmp->nm_flag & NFSMNT_INT)
                slpflag = PCATCH;
        if (!commit)
                passone = 0;
        /*
         * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
         * server, but nas not been committed to stable storage on the server
         * yet. On the first pass, the byte range is worked out and the commit
         * rpc is done. On the second pass, nfs_writebp() is called to do the
         * job.
         */
again:
        bvecpos = 0;
        if (NFS_ISV3(vp) && commit) {
                s = splbio();
                LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) {
                        if (bvecpos >= NFS_COMMITBVECSIZ)
                                break;
                        if ((bp->b_flags & (B_BUSY | B_DELWRI | B_NEEDCOMMIT))
                            != (B_DELWRI | B_NEEDCOMMIT))
                                continue;
                        bufcache_take(bp);
                        bp->b_flags |= B_WRITEINPROG;
                        buf_acquire(bp);

                        /*
                         * A list of these buffers is kept so that the
                         * second loop knows which buffers have actually
                         * been committed. This is necessary, since there
                         * may be a race between the commit rpc and new
                         * uncommitted writes on the file.
                         */
                        bvec[bvecpos++] = bp;
                        toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
                                bp->b_dirtyoff;
                        if (toff < off)
                                off = toff;
                        toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
                        if (toff > endoff)
                                endoff = toff;
                }
                splx(s);
        }
        if (bvecpos > 0) {
                /*
                 * Commit data on the server, as required.
                 */
                bcstats.pendingwrites++;
                bcstats.numwrites++;
                retv = nfs_commit(vp, off, (int)(endoff - off), p);
                if (retv == NFSERR_STALEWRITEVERF)
                        nfs_clearcommit(vp->v_mount);
                /*
                 * Now, either mark the blocks I/O done or mark the
                 * blocks dirty, depending on whether the commit
                 * succeeded.
                 */
                for (i = 0; i < bvecpos; i++) {
                        bp = bvec[i];
                        bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG);
                        if (retv) {
                                if (i == 0)
                                        bcstats.pendingwrites--;
                                brelse(bp);
                        } else {
                                if (i > 0)
                                        bcstats.pendingwrites++;
                                s = splbio();
                                buf_undirty(bp);
                                vp->v_numoutput++;
                                bp->b_flags |= B_ASYNC;
                                bp->b_flags &= ~(B_READ|B_DONE|B_ERROR);
                                bp->b_dirtyoff = bp->b_dirtyend = 0;
                                biodone(bp);
                                splx(s);
                        }
                }
        }

        /*
         * Start/do any write(s) that are required.
         */
loop:
        s = splbio();
        LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) {
                if (bp->b_flags & B_BUSY) {
                        if (waitfor != MNT_WAIT || passone)
                                continue;
                        bp->b_flags |= B_WANTED;
                        error = tsleep_nsec(bp, slpflag | (PRIBIO + 1),
                            "nfsfsync", slptimeo);
                        splx(s);
                        if (error) {
                                if (nfs_sigintr(nmp, NULL, p))
                                        return (EINTR);
                                if (slpflag == PCATCH) {
                                        slpflag = 0;
                                        slptimeo = SEC_TO_NSEC(2);
                                }
                        }
                        goto loop;
                }
                if ((bp->b_flags & B_DELWRI) == 0)
                        panic("nfs_fsync: not dirty");
                if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT))
                        continue;
                bufcache_take(bp);
                if (passone || !commit) {
                        bp->b_flags |= B_ASYNC;
                } else {
                        bp->b_flags |= (B_ASYNC|B_WRITEINPROG|B_NEEDCOMMIT);
                }
                buf_acquire(bp);
                splx(s);
                VOP_BWRITE(bp);
                goto loop;
        }
        splx(s);
        if (passone) {
                passone = 0;
                goto again;
        }
        if (waitfor == MNT_WAIT) {
 loop2:
                s = splbio();
                error = vwaitforio(vp, slpflag, "nfs_fsync", slptimeo);
                if (error) {
                        splx(s);
                        if (nfs_sigintr(nmp, NULL, p))
                                return (EINTR);
                        if (slpflag == PCATCH) {
                                slpflag = 0;
                                slptimeo = SEC_TO_NSEC(2);
                        }
                        goto loop2;
                }
                dirty = (!LIST_EMPTY(&vp->v_dirtyblkhd) && commit);
                splx(s);
                if (dirty) {
#if 0
                        vprint("nfs_fsync: dirty", vp);
#endif
                        goto loop;
                }
        }
        if (np->n_flag & NWRITEERR) {
                error = np->n_error;
                np->n_flag &= ~NWRITEERR;
        }
        return (error);
}

/*
 * Return POSIX pathconf information applicable to nfs.
 * Fake it. For v3 we could ask the server, but such code
 * hasn't been written yet.
 */
int
nfs_pathconf(void *v)
{
        struct vop_pathconf_args *ap = v;
        struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount);
        int error = 0;

        switch (ap->a_name) {
        case _PC_LINK_MAX:
                *ap->a_retval = LINK_MAX;
                break;
        case _PC_NAME_MAX:
                *ap->a_retval = NAME_MAX;
                break;
        case _PC_CHOWN_RESTRICTED:
                *ap->a_retval = 1;
                break;
        case _PC_NO_TRUNC:
                *ap->a_retval = 1;
                break;
        case _PC_ALLOC_SIZE_MIN:
                *ap->a_retval = NFS_FABLKSIZE;
                break;
        case _PC_FILESIZEBITS:
                *ap->a_retval = 64;
                break;
        case _PC_REC_INCR_XFER_SIZE:
                *ap->a_retval = min(nmp->nm_rsize, nmp->nm_wsize);
                break;
        case _PC_REC_MAX_XFER_SIZE:
                *ap->a_retval = -1; /* means ``unlimited'' */
                break;
        case _PC_REC_MIN_XFER_SIZE:
                *ap->a_retval = min(nmp->nm_rsize, nmp->nm_wsize);
                break;
        case _PC_REC_XFER_ALIGN:
                *ap->a_retval = PAGE_SIZE;
                break;
        case _PC_SYMLINK_MAX:
                *ap->a_retval = MAXPATHLEN;
                break;
        case _PC_2_SYMLINKS:
                *ap->a_retval = 1;
                break;
        case _PC_TIMESTAMP_RESOLUTION:
                *ap->a_retval = NFS_ISV3(ap->a_vp) ? 1 : 1000;
                break;
        default:
                error = EINVAL;
                break;
        }

        return (error);
}

/*
 * NFS advisory byte-level locks.
 */
int
nfs_advlock(void *v)
{
        struct vop_advlock_args *ap = v;
        struct nfsnode *np = VTONFS(ap->a_vp);

        return (lf_advlock(&np->n_lockf, np->n_size, ap->a_id, ap->a_op,
            ap->a_fl, ap->a_flags));
}

/*
 * Print out the contents of an nfsnode.
 */
int
nfs_print(void *v)
{
#if defined(DEBUG) || defined(DIAGNOSTIC) || defined(VFSLCKDEBUG)
        struct vop_print_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);

        printf("tag VT_NFS, fileid %lld fsid 0x%lx",
                np->n_vattr.va_fileid, np->n_vattr.va_fsid);
#ifdef FIFO
        if (vp->v_type == VFIFO)
                fifo_printinfo(vp);
#endif
        printf("\n");
#endif
        return (0);
}

/*
 * Just call nfs_writebp() with the force argument set to 1.
 */
int
nfs_bwrite(void *v)
{
        struct vop_bwrite_args *ap = v;

        return (nfs_writebp(ap->a_bp, 1));
}

/*
 * This is a clone of vop_generic_bwrite(), except that B_WRITEINPROG isn't set unless
 * the force flag is one and it also handles the B_NEEDCOMMIT flag.
 */
int
nfs_writebp(struct buf *bp, int force)
{
        int oldflags = bp->b_flags, retv = 1;
        struct proc *p = curproc;       /* XXX */
        off_t off;
        size_t cnt;
        int   s;
        struct vnode *vp;
        struct nfsnode *np;

        if(!(bp->b_flags & B_BUSY))
                panic("bwrite: buffer is not busy???");

        vp = bp->b_vp;
        np = VTONFS(vp);

        bp->b_flags &= ~(B_READ|B_DONE|B_ERROR);

        s = splbio();
        buf_undirty(bp);

        if ((oldflags & B_ASYNC) && !(oldflags & B_DELWRI) && p)
                ++p->p_ru.ru_oublock;

        bp->b_vp->v_numoutput++;
        splx(s);

        /*
         * If B_NEEDCOMMIT is set, a commit rpc may do the trick. If not
         * an actual write will have to be scheduled via. VOP_STRATEGY().
         * If B_WRITEINPROG is already set, then push it with a write anyhow.
         */
        if ((oldflags & (B_NEEDCOMMIT | B_WRITEINPROG)) == B_NEEDCOMMIT) {
                off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
                cnt = bp->b_dirtyend - bp->b_dirtyoff;

                rw_enter_write(&np->n_commitlock);
                if (!(bp->b_flags & B_NEEDCOMMIT)) {
                        rw_exit_write(&np->n_commitlock);
                        return (0);
                }

                /*
                 * If it's already been committed by somebody else,
                 * bail.
                 */
                if (!nfs_in_committed_range(vp, bp)) {
                        int pushedrange = 0;
                        /*
                         * Since we're going to do this, push as much
                         * as we can.
                         */

                        if (nfs_in_tobecommitted_range(vp, bp)) {
                                pushedrange = 1;
                                off = np->n_pushlo;
                                cnt = np->n_pushhi - np->n_pushlo;
                        }

                        bp->b_flags |= B_WRITEINPROG;
                        bcstats.pendingwrites++;
                        bcstats.numwrites++;
                        retv = nfs_commit(bp->b_vp, off, cnt, curproc);
                        bp->b_flags &= ~B_WRITEINPROG;

                        if (retv == 0) {
                                if (pushedrange)
                                        nfs_merge_commit_ranges(vp);
                                else
                                        nfs_add_committed_range(vp, bp);
                        } else
                                bcstats.pendingwrites--;
                } else
                        retv = 0; /* It has already been committed. */

                rw_exit_write(&np->n_commitlock);
                if (!retv) {
                        bp->b_dirtyoff = bp->b_dirtyend = 0;
                        bp->b_flags &= ~B_NEEDCOMMIT;
                        s = splbio();
                        biodone(bp);
                        splx(s);
                } else if (retv == NFSERR_STALEWRITEVERF)
                        nfs_clearcommit(bp->b_vp->v_mount);
        }
        if (retv) {
                s = splbio();
                buf_flip_dma(bp);
                if (force)
                        bp->b_flags |= B_WRITEINPROG;
                splx(s);
                VOP_STRATEGY(bp->b_vp, bp);
        }

        if( (oldflags & B_ASYNC) == 0) {
                int rtval;

                bp->b_flags |= B_RAW;
                rtval = biowait(bp);
                if (!(oldflags & B_DELWRI) && p) {
                        ++p->p_ru.ru_oublock;
                }
                brelse(bp);
                return (rtval);
        }

        return (0);
}

/*
 * nfs special file access vnode op.
 * Essentially just get vattr and then imitate iaccess() since the device is
 * local to the client.
 */
int
nfsspec_access(void *v)
{
        struct vop_access_args *ap = v;
        struct vattr va;
        struct vnode *vp = ap->a_vp;
        int error;

        /*
         * Disallow write attempts on filesystems mounted read-only;
         * unless the file is a socket, fifo, or a block or character
         * device resident on the filesystem.
         */
        if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
                switch (vp->v_type) {
                case VREG:
                case VDIR:
                case VLNK:
                        return (EROFS);
                default:
                        break;
                }
        }

        error = VOP_GETATTR(vp, &va, ap->a_cred, ap->a_p);
        if (error)
                return (error);

        return (vaccess(vp->v_type, va.va_mode, va.va_uid, va.va_gid,
            ap->a_mode, ap->a_cred));
}

/*
 * Read wrapper for special devices.
 */
int
nfsspec_read(void *v)
{
        struct vop_read_args *ap = v;
        struct nfsnode *np = VTONFS(ap->a_vp);

        /*
         * Set access flag.
         */
        np->n_flag |= NACC;
        getnanotime(&np->n_atim);
        return (spec_read(ap));
}

/*
 * Write wrapper for special devices.
 */
int
nfsspec_write(void *v)
{
        struct vop_write_args *ap = v;
        struct nfsnode *np = VTONFS(ap->a_vp);

        /*
         * Set update flag.
         */
        np->n_flag |= NUPD;
        getnanotime(&np->n_mtim);
        return (spec_write(ap));
}

/*
 * Close wrapper for special devices.
 *
 * Update the times on the nfsnode then do device close.
 */
int
nfsspec_close(void *v)
{
        struct vop_close_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        struct vattr vattr;

        if (np->n_flag & (NACC | NUPD)) {
                np->n_flag |= NCHG;
                if (vp->v_usecount == 1 &&
                    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
                        vattr_null(&vattr);
                        if (np->n_flag & NACC)
                                vattr.va_atime = np->n_atim;
                        if (np->n_flag & NUPD)
                                vattr.va_mtime = np->n_mtim;
                        (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p);
                }
        }
        return (spec_close(ap));
}

#ifdef FIFO
/*
 * Read wrapper for fifos.
 */
int
nfsfifo_read(void *v)
{
        struct vop_read_args *ap = v;
        struct nfsnode *np = VTONFS(ap->a_vp);

        /*
         * Set access flag.
         */
        np->n_flag |= NACC;
        getnanotime(&np->n_atim);
        return (fifo_read(ap));
}

/*
 * Write wrapper for fifos.
 */
int
nfsfifo_write(void *v)
{
        struct vop_write_args *ap = v;
        struct nfsnode *np = VTONFS(ap->a_vp);

        /*
         * Set update flag.
         */
        np->n_flag |= NUPD;
        getnanotime(&np->n_mtim);
        return (fifo_write(ap));
}

/*
 * Close wrapper for fifos.
 *
 * Update the times on the nfsnode then do fifo close.
 */
int
nfsfifo_close(void *v)
{
        struct vop_close_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct nfsnode *np = VTONFS(vp);
        struct vattr vattr;

        if (np->n_flag & (NACC | NUPD)) {
                if (np->n_flag & NACC) {
                        getnanotime(&np->n_atim);
                }
                if (np->n_flag & NUPD) {
                        getnanotime(&np->n_mtim);
                }
                np->n_flag |= NCHG;
                if (vp->v_usecount == 1 &&
                    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
                        vattr_null(&vattr);
                        if (np->n_flag & NACC)
                                vattr.va_atime = np->n_atim;
                        if (np->n_flag & NUPD)
                                vattr.va_mtime = np->n_mtim;
                        (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p);
                }
        }
        return (fifo_close(ap));
}

int
nfsfifo_reclaim(void *v)
{
        fifo_reclaim(v);
        return (nfs_reclaim(v));
}
#endif /* ! FIFO */