procfs_doprocfile(): simplify

[FreeBSD/FreeBSD.git] / sys / fs / nfsserver / nfs_nfsdport.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/capsicum.h>
#include <sys/extattr.h>

/*
 * Functions that perform the vfs operations required by the routines in
 * nfsd_serv.c. It is hoped that this change will make the server more
 * portable.
 */

#include <fs/nfs/nfsport.h>
#include <security/mac/mac_framework.h>
#include <sys/filio.h>
#include <sys/hash.h>
#include <sys/sysctl.h>
#include <nlm/nlm_prot.h>
#include <nlm/nlm.h>

FEATURE(nfsd, "NFSv4 server");

extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
extern int nfsrv_useacl;
extern int newnfs_numnfsd;
extern struct mount nfsv4root_mnt;
extern struct nfsrv_stablefirst nfsrv_stablefirst;
extern void (*nfsd_call_servertimer)(void);
extern SVCPOOL  *nfsrvd_pool;
extern struct nfsv4lock nfsd_suspend_lock;
extern struct nfsclienthashhead *nfsclienthash;
extern struct nfslockhashhead *nfslockhash;
extern struct nfssessionhash *nfssessionhash;
extern int nfsrv_sessionhashsize;
extern struct nfsstatsv1 nfsstatsv1;
extern struct nfslayouthash *nfslayouthash;
extern int nfsrv_layouthashsize;
extern struct mtx nfsrv_dslock_mtx;
extern int nfs_pnfsiothreads;
extern struct nfsdontlisthead nfsrv_dontlisthead;
extern volatile int nfsrv_dontlistlen;
extern volatile int nfsrv_devidcnt;
extern int nfsrv_maxpnfsmirror;
extern uint32_t nfs_srvmaxio;
extern int nfs_bufpackets;
extern u_long sb_max_adj;
struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
NFSDLOCKMUTEX;
NFSSTATESPINLOCK;
struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
struct mtx nfsrc_udpmtx;
struct mtx nfs_v4root_mutex;
struct mtx nfsrv_dontlistlock_mtx;
struct mtx nfsrv_recalllock_mtx;
struct nfsrvfh nfs_rootfh, nfs_pubfh;
int nfs_pubfhset = 0, nfs_rootfhset = 0;
struct proc *nfsd_master_proc = NULL;
int nfsd_debuglevel = 0;
static pid_t nfsd_master_pid = (pid_t)-1;
static char nfsd_master_comm[MAXCOMLEN + 1];
static struct timeval nfsd_master_start;
static uint32_t nfsv4_sysid = 0;
static fhandle_t zerofh;

static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
    struct ucred *);

int nfsrv_enable_crossmntpt = 1;
static int nfs_commit_blks;
static int nfs_commit_miss;
extern int nfsrv_issuedelegs;
extern int nfsrv_dolocallocks;
extern int nfsd_enable_stringtouid;
extern struct nfsdevicehead nfsrv_devidhead;

static int nfsrv_createiovec(int, struct mbuf **, struct mbuf **,
    struct iovec **);
static int nfsrv_createiovec_extpgs(int, int, struct mbuf **,
    struct mbuf **, struct iovec **);
static int nfsrv_createiovecw(int, struct mbuf *, char *, struct iovec **,
    int *);
static void nfsrv_pnfscreate(struct vnode *, struct vattr *, struct ucred *,
    NFSPROC_T *);
static void nfsrv_pnfsremovesetup(struct vnode *, NFSPROC_T *, struct vnode **,
    int *, char *, fhandle_t *);
static void nfsrv_pnfsremove(struct vnode **, int, char *, fhandle_t *,
    NFSPROC_T *);
static int nfsrv_proxyds(struct vnode *, off_t, int, struct ucred *,
    struct thread *, int, struct mbuf **, char *, struct mbuf **,
    struct nfsvattr *, struct acl *, off_t *, int, bool *);
static int nfsrv_setextattr(struct vnode *, struct nfsvattr *, NFSPROC_T *);
static int nfsrv_readdsrpc(fhandle_t *, off_t, int, struct ucred *,
    NFSPROC_T *, struct nfsmount *, struct mbuf **, struct mbuf **);
static int nfsrv_writedsrpc(fhandle_t *, off_t, int, struct ucred *,
    NFSPROC_T *, struct vnode *, struct nfsmount **, int, struct mbuf **,
    char *, int *);
static int nfsrv_allocatedsrpc(fhandle_t *, off_t, off_t, struct ucred *,
    NFSPROC_T *, struct vnode *, struct nfsmount **, int, int *);
static int nfsrv_setacldsrpc(fhandle_t *, struct ucred *, NFSPROC_T *,
    struct vnode *, struct nfsmount **, int, struct acl *, int *);
static int nfsrv_setattrdsrpc(fhandle_t *, struct ucred *, NFSPROC_T *,
    struct vnode *, struct nfsmount **, int, struct nfsvattr *, int *);
static int nfsrv_getattrdsrpc(fhandle_t *, struct ucred *, NFSPROC_T *,
    struct vnode *, struct nfsmount *, struct nfsvattr *);
static int nfsrv_seekdsrpc(fhandle_t *, off_t *, int, bool *, struct ucred *,
    NFSPROC_T *, struct nfsmount *);
static int nfsrv_putfhname(fhandle_t *, char *);
static int nfsrv_pnfslookupds(struct vnode *, struct vnode *,
    struct pnfsdsfile *, struct vnode **, NFSPROC_T *);
static void nfsrv_pnfssetfh(struct vnode *, struct pnfsdsfile *, char *, char *,
    struct vnode *, NFSPROC_T *);
static int nfsrv_dsremove(struct vnode *, char *, struct ucred *, NFSPROC_T *);
static int nfsrv_dssetacl(struct vnode *, struct acl *, struct ucred *,
    NFSPROC_T *);
static int nfsrv_pnfsstatfs(struct statfs *, struct mount *);

int nfs_pnfsio(task_fn_t *, void *);

SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "NFS server");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
    &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
    0, "");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
    0, "");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
    &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
    &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
    0, "Debug level for NFS server");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
    &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
static int nfsrv_pnfsgetdsattr = 1;
SYSCTL_INT(_vfs_nfsd, OID_AUTO, pnfsgetdsattr, CTLFLAG_RW,
    &nfsrv_pnfsgetdsattr, 0, "When set getattr gets DS attributes via RPC");

/*
 * nfsrv_dsdirsize can only be increased and only when the nfsd threads are
 * not running.
 * The dsN subdirectories for the increased values must have been created
 * on all DS servers before this increase is done.
 */
u_int   nfsrv_dsdirsize = 20;
static int
sysctl_dsdirsize(SYSCTL_HANDLER_ARGS)
{
        int error, newdsdirsize;

        newdsdirsize = nfsrv_dsdirsize;
        error = sysctl_handle_int(oidp, &newdsdirsize, 0, req);
        if (error != 0 || req->newptr == NULL)
                return (error);
        if (newdsdirsize <= nfsrv_dsdirsize || newdsdirsize > 10000 ||
            newnfs_numnfsd != 0)
                return (EINVAL);
        nfsrv_dsdirsize = newdsdirsize;
        return (0);
}
SYSCTL_PROC(_vfs_nfsd, OID_AUTO, dsdirsize,
    CTLTYPE_UINT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(nfsrv_dsdirsize),
    sysctl_dsdirsize, "IU", "Number of dsN subdirs on the DS servers");

/*
 * nfs_srvmaxio can only be increased and only when the nfsd threads are
 * not running.  The setting must be a power of 2, with the current limit of
 * 1Mbyte.
 */
static int
sysctl_srvmaxio(SYSCTL_HANDLER_ARGS)
{
        int error;
        u_int newsrvmaxio;
        uint64_t tval;

        newsrvmaxio = nfs_srvmaxio;
        error = sysctl_handle_int(oidp, &newsrvmaxio, 0, req);
        if (error != 0 || req->newptr == NULL)
                return (error);
        if (newsrvmaxio == nfs_srvmaxio)
                return (0);
        if (newsrvmaxio < nfs_srvmaxio) {
                printf("nfsd: vfs.nfsd.srvmaxio can only be increased\n");
                return (EINVAL);
        }
        if (newsrvmaxio > 1048576) {
                printf("nfsd: vfs.nfsd.srvmaxio cannot be > 1Mbyte\n");
                return (EINVAL);
        }
        if ((newsrvmaxio & (newsrvmaxio - 1)) != 0) {
                printf("nfsd: vfs.nfsd.srvmaxio must be a power of 2\n");
                return (EINVAL);
        }

        /*
         * Check that kern.ipc.maxsockbuf is large enough for
         * newsrviomax, given the setting of vfs.nfs.bufpackets.
         */
        if ((newsrvmaxio + NFS_MAXXDR) * nfs_bufpackets >
            sb_max_adj) {
                /*
                 * Suggest vfs.nfs.bufpackets * maximum RPC message for
                 * sb_max_adj.
                 */
                tval = (newsrvmaxio + NFS_MAXXDR) * nfs_bufpackets;

                /*
                 * Convert suggested sb_max_adj value to a suggested
                 * sb_max value, which is what is set via kern.ipc.maxsockbuf.
                 * Perform the inverse calculation of (from uipc_sockbuf.c):
                 * sb_max_adj = (u_quad_t)sb_max * MCLBYTES /
                 *     (MSIZE + MCLBYTES);
                 * XXX If the calculation of sb_max_adj from sb_max changes,
                 *     this calculation must be changed as well.
                 */
                tval *= (MSIZE + MCLBYTES);  /* Brackets for readability. */
                tval += MCLBYTES - 1;        /* Round up divide. */
                tval /= MCLBYTES;
                printf("nfsd: set kern.ipc.maxsockbuf to a minimum of "
                    "%ju to support %ubyte NFS I/O\n", (uintmax_t)tval,
                    newsrvmaxio);
                return (EINVAL);
        }

        NFSD_LOCK();
        if (newnfs_numnfsd != 0) {
                NFSD_UNLOCK();
                printf("nfsd: cannot set vfs.nfsd.srvmaxio when nfsd "
                    "threads are running\n");
                return (EINVAL);
        }


        nfs_srvmaxio = newsrvmaxio;
        NFSD_UNLOCK();
        return (0);
}
SYSCTL_PROC(_vfs_nfsd, OID_AUTO, srvmaxio,
    CTLTYPE_UINT | CTLFLAG_MPSAFE | CTLFLAG_RW, NULL, 0,
    sysctl_srvmaxio, "IU", "Maximum I/O size in bytes");

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

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

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

        /* Locate best candidate. */
        try = 32;
        hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
        nh = &nfsheur[hi];
        while (try--) {
                if (nfsheur[hi].nh_vp == vp) {
                        nh = &nfsheur[hi];
                        break;
                }
                if (nfsheur[hi].nh_use > 0)
                        --nfsheur[hi].nh_use;
                hi = (hi + 1) % NUM_HEURISTIC;
                if (nfsheur[hi].nh_use < nh->nh_use)
                        nh = &nfsheur[hi];
        }

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

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

/*
 * Get attributes into nfsvattr structure.
 */
int
nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap,
    struct nfsrv_descript *nd, struct thread *p, int vpislocked,
    nfsattrbit_t *attrbitp)
{
        int error, gotattr, lockedit = 0;
        struct nfsvattr na;

        if (vpislocked == 0) {
                /*
                 * When vpislocked == 0, the vnode is either exclusively
                 * locked by this thread or not locked by this thread.
                 * As such, shared lock it, if not exclusively locked.
                 */
                if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
                        lockedit = 1;
                        NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
                }
        }

        /*
         * Acquire the Change, Size, TimeAccess, TimeModify and SpaceUsed
         * attributes, as required.
         * This needs to be done for regular files if:
         * - non-NFSv4 RPCs or
         * - when attrbitp == NULL or
         * - an NFSv4 RPC with any of the above attributes in attrbitp.
         * A return of 0 for nfsrv_proxyds() indicates that it has acquired
         * these attributes.  nfsrv_proxyds() will return an error if the
         * server is not a pNFS one.
         */
        gotattr = 0;
        if (vp->v_type == VREG && nfsrv_devidcnt > 0 && (attrbitp == NULL ||
            (nd->nd_flag & ND_NFSV4) == 0 ||
            NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_CHANGE) ||
            NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SIZE) ||
            NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_TIMEACCESS) ||
            NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_TIMEMODIFY) ||
            NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SPACEUSED))) {
                error = nfsrv_proxyds(vp, 0, 0, nd->nd_cred, p,
                    NFSPROC_GETATTR, NULL, NULL, NULL, &na, NULL, NULL, 0,
                    NULL);
                if (error == 0)
                        gotattr = 1;
        }

        error = VOP_GETATTR(vp, &nvap->na_vattr, nd->nd_cred);
        if (lockedit != 0)
                NFSVOPUNLOCK(vp);

        /*
         * If we got the Change, Size and Modify Time from the DS,
         * replace them.
         */
        if (gotattr != 0) {
                nvap->na_atime = na.na_atime;
                nvap->na_mtime = na.na_mtime;
                nvap->na_filerev = na.na_filerev;
                nvap->na_size = na.na_size;
                nvap->na_bytes = na.na_bytes;
        }
        NFSD_DEBUG(4, "nfsvno_getattr: gotattr=%d err=%d chg=%ju\n", gotattr,
            error, (uintmax_t)na.na_filerev);

        NFSEXITCODE(error);
        return (error);
}

/*
 * Get a file handle for a vnode.
 */
int
nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
{
        int error;

        NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
        fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
        error = VOP_VPTOFH(vp, &fhp->fh_fid);

        NFSEXITCODE(error);
        return (error);
}

/*
 * Perform access checking for vnodes obtained from file handles that would
 * refer to files already opened by a Unix client. You cannot just use
 * vn_writechk() and VOP_ACCESSX() for two reasons.
 * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 *     case.
 * 2 - The owner is to be given access irrespective of mode bits for some
 *     operations, so that processes that chmod after opening a file don't
 *     break.
 */
int
nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
    struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
    u_int32_t *supportedtypep)
{
        struct vattr vattr;
        int error = 0, getret = 0;

        if (vpislocked == 0) {
                if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
                        error = EPERM;
                        goto out;
                }
        }
        if (accmode & VWRITE) {
                /* Just vn_writechk() changed to check rdonly */
                /*
                 * Disallow write attempts on read-only file systems;
                 * unless the file is a socket or a block or character
                 * device resident on the file system.
                 */
                if (NFSVNO_EXRDONLY(exp) ||
                    (vp->v_mount->mnt_flag & MNT_RDONLY)) {
                        switch (vp->v_type) {
                        case VREG:
                        case VDIR:
                        case VLNK:
                                error = EROFS;
                        default:
                                break;
                        }
                }
                /*
                 * If there's shared text associated with
                 * the inode, try to free it up once.  If
                 * we fail, we can't allow writing.
                 */
                if (VOP_IS_TEXT(vp) && error == 0)
                        error = ETXTBSY;
        }
        if (error != 0) {
                if (vpislocked == 0)
                        NFSVOPUNLOCK(vp);
                goto out;
        }

        /*
         * Should the override still be applied when ACLs are enabled?
         */
        error = VOP_ACCESSX(vp, accmode, cred, p);
        if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
                /*
                 * Try again with VEXPLICIT_DENY, to see if the test for
                 * deletion is supported.
                 */
                error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
                if (error == 0) {
                        if (vp->v_type == VDIR) {
                                accmode &= ~(VDELETE | VDELETE_CHILD);
                                accmode |= VWRITE;
                                error = VOP_ACCESSX(vp, accmode, cred, p);
                        } else if (supportedtypep != NULL) {
                                *supportedtypep &= ~NFSACCESS_DELETE;
                        }
                }
        }

        /*
         * Allow certain operations for the owner (reads and writes
         * on files that are already open).
         */
        if (override != NFSACCCHK_NOOVERRIDE &&
            (error == EPERM || error == EACCES)) {
                if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
                        error = 0;
                else if (override & NFSACCCHK_ALLOWOWNER) {
                        getret = VOP_GETATTR(vp, &vattr, cred);
                        if (getret == 0 && cred->cr_uid == vattr.va_uid)
                                error = 0;
                }
        }
        if (vpislocked == 0)
                NFSVOPUNLOCK(vp);

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Set attribute(s) vnop.
 */
int
nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
    struct thread *p, struct nfsexstuff *exp)
{
        u_quad_t savsize = 0;
        int error, savedit;
        time_t savbtime;

        /*
         * If this is an exported file system and a pNFS service is running,
         * don't VOP_SETATTR() of size for the MDS file system.
         */
        savedit = 0;
        error = 0;
        if (vp->v_type == VREG && (vp->v_mount->mnt_flag & MNT_EXPORTED) != 0 &&
            nfsrv_devidcnt != 0 && nvap->na_vattr.va_size != VNOVAL &&
            nvap->na_vattr.va_size > 0) {
                savsize = nvap->na_vattr.va_size;
                nvap->na_vattr.va_size = VNOVAL;
                if (nvap->na_vattr.va_uid != (uid_t)VNOVAL ||
                    nvap->na_vattr.va_gid != (gid_t)VNOVAL ||
                    nvap->na_vattr.va_mode != (mode_t)VNOVAL ||
                    nvap->na_vattr.va_atime.tv_sec != VNOVAL ||
                    nvap->na_vattr.va_mtime.tv_sec != VNOVAL)
                        savedit = 1;
                else
                        savedit = 2;
        }
        if (savedit != 2)
                error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
        if (savedit != 0)
                nvap->na_vattr.va_size = savsize;
        if (error == 0 && (nvap->na_vattr.va_uid != (uid_t)VNOVAL ||
            nvap->na_vattr.va_gid != (gid_t)VNOVAL ||
            nvap->na_vattr.va_size != VNOVAL ||
            nvap->na_vattr.va_mode != (mode_t)VNOVAL ||
            nvap->na_vattr.va_atime.tv_sec != VNOVAL ||
            nvap->na_vattr.va_mtime.tv_sec != VNOVAL)) {
                /* Never modify birthtime on a DS file. */
                savbtime = nvap->na_vattr.va_birthtime.tv_sec;
                nvap->na_vattr.va_birthtime.tv_sec = VNOVAL;
                /* For a pNFS server, set the attributes on the DS file. */
                error = nfsrv_proxyds(vp, 0, 0, cred, p, NFSPROC_SETATTR,
                    NULL, NULL, NULL, nvap, NULL, NULL, 0, NULL);
                nvap->na_vattr.va_birthtime.tv_sec = savbtime;
                if (error == ENOENT)
                        error = 0;
        }
        NFSEXITCODE(error);
        return (error);
}

/*
 * Set up nameidata for a lookup() call and do it.
 */
int
nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
    struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
    struct vnode **retdirp)
{
        struct componentname *cnp = &ndp->ni_cnd;
        int i;
        struct iovec aiov;
        struct uio auio;
        int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
        int error = 0;
        char *cp;

        *retdirp = NULL;
        cnp->cn_nameptr = cnp->cn_pnbuf;
        ndp->ni_lcf = 0;
        /*
         * Extract and set starting directory.
         */
        if (dp->v_type != VDIR) {
                if (islocked)
                        vput(dp);
                else
                        vrele(dp);
                nfsvno_relpathbuf(ndp);
                error = ENOTDIR;
                goto out1;
        }
        if (islocked)
                NFSVOPUNLOCK(dp);
        VREF(dp);
        *retdirp = dp;
        if (NFSVNO_EXRDONLY(exp))
                cnp->cn_flags |= RDONLY;
        ndp->ni_segflg = UIO_SYSSPACE;

        if (nd->nd_flag & ND_PUBLOOKUP) {
                ndp->ni_loopcnt = 0;
                if (cnp->cn_pnbuf[0] == '/') {
                        vrele(dp);
                        /*
                         * Check for degenerate pathnames here, since lookup()
                         * panics on them.
                         */
                        for (i = 1; i < ndp->ni_pathlen; i++)
                                if (cnp->cn_pnbuf[i] != '/')
                                        break;
                        if (i == ndp->ni_pathlen) {
                                error = NFSERR_ACCES;
                                goto out;
                        }
                        dp = rootvnode;
                        VREF(dp);
                }
        } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
            (nd->nd_flag & ND_NFSV4) == 0) {
                /*
                 * Only cross mount points for NFSv4 when doing a
                 * mount while traversing the file system above
                 * the mount point, unless nfsrv_enable_crossmntpt is set.
                 */
                cnp->cn_flags |= NOCROSSMOUNT;
        }

        /*
         * Initialize for scan, set ni_startdir and bump ref on dp again
         * because lookup() will dereference ni_startdir.
         */

        cnp->cn_thread = p;
        ndp->ni_startdir = dp;
        ndp->ni_rootdir = rootvnode;
        ndp->ni_topdir = NULL;

        if (!lockleaf)
                cnp->cn_flags |= LOCKLEAF;
        for (;;) {
                cnp->cn_nameptr = cnp->cn_pnbuf;
                /*
                 * Call lookup() to do the real work.  If an error occurs,
                 * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
                 * we do not have to dereference anything before returning.
                 * In either case ni_startdir will be dereferenced and NULLed
                 * out.
                 */
                error = lookup(ndp);
                if (error)
                        break;

                /*
                 * Check for encountering a symbolic link.  Trivial
                 * termination occurs if no symlink encountered.
                 */
                if ((cnp->cn_flags & ISSYMLINK) == 0) {
                        if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
                                nfsvno_relpathbuf(ndp);
                        if (ndp->ni_vp && !lockleaf)
                                NFSVOPUNLOCK(ndp->ni_vp);
                        break;
                }

                /*
                 * Validate symlink
                 */
                if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
                        NFSVOPUNLOCK(ndp->ni_dvp);
                if (!(nd->nd_flag & ND_PUBLOOKUP)) {
                        error = EINVAL;
                        goto badlink2;
                }

                if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
                        error = ELOOP;
                        goto badlink2;
                }
                if (ndp->ni_pathlen > 1)
                        cp = uma_zalloc(namei_zone, M_WAITOK);
                else
                        cp = cnp->cn_pnbuf;
                aiov.iov_base = cp;
                aiov.iov_len = MAXPATHLEN;
                auio.uio_iov = &aiov;
                auio.uio_iovcnt = 1;
                auio.uio_offset = 0;
                auio.uio_rw = UIO_READ;
                auio.uio_segflg = UIO_SYSSPACE;
                auio.uio_td = NULL;
                auio.uio_resid = MAXPATHLEN;
                error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
                if (error) {
                badlink1:
                        if (ndp->ni_pathlen > 1)
                                uma_zfree(namei_zone, cp);
                badlink2:
                        vrele(ndp->ni_dvp);
                        vput(ndp->ni_vp);
                        break;
                }
                linklen = MAXPATHLEN - auio.uio_resid;
                if (linklen == 0) {
                        error = ENOENT;
                        goto badlink1;
                }
                if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
                        error = ENAMETOOLONG;
                        goto badlink1;
                }

                /*
                 * Adjust or replace path
                 */
                if (ndp->ni_pathlen > 1) {
                        NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
                        uma_zfree(namei_zone, cnp->cn_pnbuf);
                        cnp->cn_pnbuf = cp;
                } else
                        cnp->cn_pnbuf[linklen] = '\0';
                ndp->ni_pathlen += linklen;

                /*
                 * Cleanup refs for next loop and check if root directory
                 * should replace current directory.  Normally ni_dvp
                 * becomes the new base directory and is cleaned up when
                 * we loop.  Explicitly null pointers after invalidation
                 * to clarify operation.
                 */
                vput(ndp->ni_vp);
                ndp->ni_vp = NULL;

                if (cnp->cn_pnbuf[0] == '/') {
                        vrele(ndp->ni_dvp);
                        ndp->ni_dvp = ndp->ni_rootdir;
                        VREF(ndp->ni_dvp);
                }
                ndp->ni_startdir = ndp->ni_dvp;
                ndp->ni_dvp = NULL;
        }
        if (!lockleaf)
                cnp->cn_flags &= ~LOCKLEAF;

out:
        if (error) {
                nfsvno_relpathbuf(ndp);
                ndp->ni_vp = NULL;
                ndp->ni_dvp = NULL;
                ndp->ni_startdir = NULL;
        } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
                ndp->ni_dvp = NULL;
        }

out1:
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Set up a pathname buffer and return a pointer to it and, optionally
 * set a hash pointer.
 */
void
nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
{
        struct componentname *cnp = &ndp->ni_cnd;

        cnp->cn_flags |= (NOMACCHECK | HASBUF);
        cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
        if (hashpp != NULL)
                *hashpp = NULL;
        *bufpp = cnp->cn_pnbuf;
}

/*
 * Release the above path buffer, if not released by nfsvno_namei().
 */
void
nfsvno_relpathbuf(struct nameidata *ndp)
{

        if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
                panic("nfsrelpath");
        uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
        ndp->ni_cnd.cn_flags &= ~HASBUF;
}

/*
 * Readlink vnode op into an mbuf list.
 */
int
nfsvno_readlink(struct vnode *vp, struct ucred *cred, int maxextsiz,
    struct thread *p, struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
{
        struct iovec *iv;
        struct uio io, *uiop = &io;
        struct mbuf *mp, *mp3;
        int len, tlen, error = 0;

        len = NFS_MAXPATHLEN;
        if (maxextsiz > 0)
                uiop->uio_iovcnt = nfsrv_createiovec_extpgs(len, maxextsiz,
                    &mp3, &mp, &iv);
        else
                uiop->uio_iovcnt = nfsrv_createiovec(len, &mp3, &mp, &iv);
        uiop->uio_iov = iv;
        uiop->uio_offset = 0;
        uiop->uio_resid = len;
        uiop->uio_rw = UIO_READ;
        uiop->uio_segflg = UIO_SYSSPACE;
        uiop->uio_td = NULL;
        error = VOP_READLINK(vp, uiop, cred);
        free(iv, M_TEMP);
        if (error) {
                m_freem(mp3);
                *lenp = 0;
                goto out;
        }
        if (uiop->uio_resid > 0) {
                len -= uiop->uio_resid;
                tlen = NFSM_RNDUP(len);
                if (tlen == 0) {
                        m_freem(mp3);
                        mp3 = mp = NULL;
                } else if (tlen != NFS_MAXPATHLEN || tlen != len)
                        mp = nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen,
                            tlen - len);
        }
        *lenp = len;
        *mpp = mp3;
        *mpendp = mp;

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Create an mbuf chain and an associated iovec that can be used to Read
 * or Getextattr of data.
 * Upon success, return pointers to the first and last mbufs in the chain
 * plus the malloc'd iovec and its iovlen.
 */
static int
nfsrv_createiovec(int len, struct mbuf **mpp, struct mbuf **mpendp,
    struct iovec **ivp)
{
        struct mbuf *m, *m2 = NULL, *m3;
        struct iovec *iv;
        int i, left, siz;

        left = len;
        m3 = NULL;
        /*
         * Generate the mbuf list with the uio_iov ref. to it.
         */
        i = 0;
        while (left > 0) {
                NFSMGET(m);
                MCLGET(m, M_WAITOK);
                m->m_len = 0;
                siz = min(M_TRAILINGSPACE(m), left);
                left -= siz;
                i++;
                if (m3)
                        m2->m_next = m;
                else
                        m3 = m;
                m2 = m;
        }
        *ivp = iv = malloc(i * sizeof (struct iovec), M_TEMP, M_WAITOK);
        m = m3;
        left = len;
        i = 0;
        while (left > 0) {
                if (m == NULL)
                        panic("nfsrv_createiovec iov");
                siz = min(M_TRAILINGSPACE(m), left);
                if (siz > 0) {
                        iv->iov_base = mtod(m, caddr_t) + m->m_len;
                        iv->iov_len = siz;
                        m->m_len += siz;
                        left -= siz;
                        iv++;
                        i++;
                }
                m = m->m_next;
        }
        *mpp = m3;
        *mpendp = m2;
        return (i);
}

/*
 * Create an mbuf chain and an associated iovec that can be used to Read
 * or Getextattr of data.
 * Upon success, return pointers to the first and last mbufs in the chain
 * plus the malloc'd iovec and its iovlen.
 * Same as above, but creates ext_pgs mbuf(s).
 */
static int
nfsrv_createiovec_extpgs(int len, int maxextsiz, struct mbuf **mpp,
    struct mbuf **mpendp, struct iovec **ivp)
{
        struct mbuf *m, *m2 = NULL, *m3;
        struct iovec *iv;
        int i, left, pgno, siz;

        left = len;
        m3 = NULL;
        /*
         * Generate the mbuf list with the uio_iov ref. to it.
         */
        i = 0;
        while (left > 0) {
                siz = min(left, maxextsiz);
                m = mb_alloc_ext_plus_pages(siz, M_WAITOK);
                left -= siz;
                i += m->m_epg_npgs;
                if (m3 != NULL)
                        m2->m_next = m;
                else
                        m3 = m;
                m2 = m;
        }
        *ivp = iv = malloc(i * sizeof (struct iovec), M_TEMP, M_WAITOK);
        m = m3;
        left = len;
        i = 0;
        pgno = 0;
        while (left > 0) {
                if (m == NULL)
                        panic("nfsvno_createiovec_extpgs iov");
                siz = min(PAGE_SIZE, left);
                if (siz > 0) {
                        iv->iov_base = (void *)PHYS_TO_DMAP(m->m_epg_pa[pgno]);
                        iv->iov_len = siz;
                        m->m_len += siz;
                        if (pgno == m->m_epg_npgs - 1)
                                m->m_epg_last_len = siz;
                        left -= siz;
                        iv++;
                        i++;
                        pgno++;
                }
                if (pgno == m->m_epg_npgs && left > 0) {
                        m = m->m_next;
                        if (m == NULL)
                                panic("nfsvno_createiovec_extpgs iov");
                        pgno = 0;
                }
        }
        *mpp = m3;
        *mpendp = m2;
        return (i);
}

/*
 * Read vnode op call into mbuf list.
 */
int
nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
    int maxextsiz, struct thread *p, struct mbuf **mpp,
    struct mbuf **mpendp)
{
        struct mbuf *m;
        struct iovec *iv;
        int error = 0, len, tlen, ioflag = 0;
        struct mbuf *m3;
        struct uio io, *uiop = &io;
        struct nfsheur *nh;

        /*
         * Attempt to read from a DS file. A return of ENOENT implies
         * there is no DS file to read.
         */
        error = nfsrv_proxyds(vp, off, cnt, cred, p, NFSPROC_READDS, mpp,
            NULL, mpendp, NULL, NULL, NULL, 0, NULL);
        if (error != ENOENT)
                return (error);

        len = NFSM_RNDUP(cnt);
        if (maxextsiz > 0)
                uiop->uio_iovcnt = nfsrv_createiovec_extpgs(len, maxextsiz,
                    &m3, &m, &iv);
        else
                uiop->uio_iovcnt = nfsrv_createiovec(len, &m3, &m, &iv);
        uiop->uio_iov = iv;
        uiop->uio_offset = off;
        uiop->uio_resid = len;
        uiop->uio_rw = UIO_READ;
        uiop->uio_segflg = UIO_SYSSPACE;
        uiop->uio_td = NULL;
        nh = nfsrv_sequential_heuristic(uiop, vp);
        ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
        /* XXX KDM make this more systematic? */
        nfsstatsv1.srvbytes[NFSV4OP_READ] += uiop->uio_resid;
        error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
        free(iv, M_TEMP);
        if (error) {
                m_freem(m3);
                *mpp = NULL;
                goto out;
        }
        nh->nh_nextoff = uiop->uio_offset;
        tlen = len - uiop->uio_resid;
        cnt = cnt < tlen ? cnt : tlen;
        tlen = NFSM_RNDUP(cnt);
        if (tlen == 0) {
                m_freem(m3);
                m3 = m = NULL;
        } else if (len != tlen || tlen != cnt)
                m = nfsrv_adj(m3, len - tlen, tlen - cnt);
        *mpp = m3;
        *mpendp = m;

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Create the iovec for the mbuf chain passed in as an argument.
 * The "cp" argument is where the data starts within the first mbuf in
 * the chain. It returns the iovec and the iovcnt.
 */
static int
nfsrv_createiovecw(int retlen, struct mbuf *m, char *cp, struct iovec **ivpp,
    int *iovcntp)
{
        struct mbuf *mp;
        struct iovec *ivp;
        int cnt, i, len;

        /*
         * Loop through the mbuf chain, counting how many mbufs are a
         * part of this write operation, so the iovec size is known.
         */
        cnt = 0;
        len = retlen;
        mp = m;
        i = mtod(mp, caddr_t) + mp->m_len - cp;
        while (len > 0) {
                if (i > 0) {
                        len -= i;
                        cnt++;
                }
                mp = mp->m_next;
                if (!mp) {
                        if (len > 0)
                                return (EBADRPC);
                } else
                        i = mp->m_len;
        }

        /* Now, create the iovec. */
        mp = m;
        *ivpp = ivp = malloc(cnt * sizeof (struct iovec), M_TEMP,
            M_WAITOK);
        *iovcntp = cnt;
        i = mtod(mp, caddr_t) + mp->m_len - cp;
        len = retlen;
        while (len > 0) {
                if (mp == NULL)
                        panic("nfsrv_createiovecw");
                if (i > 0) {
                        i = min(i, len);
                        ivp->iov_base = cp;
                        ivp->iov_len = i;
                        ivp++;
                        len -= i;
                }
                mp = mp->m_next;
                if (mp) {
                        i = mp->m_len;
                        cp = mtod(mp, caddr_t);
                }
        }
        return (0);
}

/*
 * Write vnode op from an mbuf list.
 */
int
nfsvno_write(struct vnode *vp, off_t off, int retlen, int *stable,
    struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
{
        struct iovec *iv;
        int cnt, ioflags, error;
        struct uio io, *uiop = &io;
        struct nfsheur *nh;

        /*
         * Attempt to write to a DS file. A return of ENOENT implies
         * there is no DS file to write.
         */
        error = nfsrv_proxyds(vp, off, retlen, cred, p, NFSPROC_WRITEDS,
            &mp, cp, NULL, NULL, NULL, NULL, 0, NULL);
        if (error != ENOENT) {
                *stable = NFSWRITE_FILESYNC;
                return (error);
        }

        if (*stable == NFSWRITE_UNSTABLE)
                ioflags = IO_NODELOCKED;
        else
                ioflags = (IO_SYNC | IO_NODELOCKED);
        error = nfsrv_createiovecw(retlen, mp, cp, &iv, &cnt);
        if (error != 0)
                return (error);
        uiop->uio_iov = iv;
        uiop->uio_iovcnt = cnt;
        uiop->uio_resid = retlen;
        uiop->uio_rw = UIO_WRITE;
        uiop->uio_segflg = UIO_SYSSPACE;
        NFSUIOPROC(uiop, p);
        uiop->uio_offset = off;
        nh = nfsrv_sequential_heuristic(uiop, vp);
        ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
        /* XXX KDM make this more systematic? */
        nfsstatsv1.srvbytes[NFSV4OP_WRITE] += uiop->uio_resid;
        error = VOP_WRITE(vp, uiop, ioflags, cred);
        if (error == 0)
                nh->nh_nextoff = uiop->uio_offset;
        free(iv, M_TEMP);

        NFSEXITCODE(error);
        return (error);
}

/*
 * Common code for creating a regular file (plus special files for V2).
 */
int
nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
    struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
    int32_t *cverf, NFSDEV_T rdev, struct nfsexstuff *exp)
{
        u_quad_t tempsize;
        int error;
        struct thread *p = curthread;

        error = nd->nd_repstat;
        if (!error && ndp->ni_vp == NULL) {
                if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
                        vrele(ndp->ni_startdir);
                        error = VOP_CREATE(ndp->ni_dvp,
                            &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
                        /* For a pNFS server, create the data file on a DS. */
                        if (error == 0 && nvap->na_type == VREG) {
                                /*
                                 * Create a data file on a DS for a pNFS server.
                                 * This function just returns if not
                                 * running a pNFS DS or the creation fails.
                                 */
                                nfsrv_pnfscreate(ndp->ni_vp, &nvap->na_vattr,
                                    nd->nd_cred, p);
                        }
                        VOP_VPUT_PAIR(ndp->ni_dvp, error == 0 ? &ndp->ni_vp :
                            NULL, false);
                        nfsvno_relpathbuf(ndp);
                        if (!error) {
                                if (*exclusive_flagp) {
                                        *exclusive_flagp = 0;
                                        NFSVNO_ATTRINIT(nvap);
                                        nvap->na_atime.tv_sec = cverf[0];
                                        nvap->na_atime.tv_nsec = cverf[1];
                                        error = VOP_SETATTR(ndp->ni_vp,
                                            &nvap->na_vattr, nd->nd_cred);
                                        if (error != 0) {
                                                vput(ndp->ni_vp);
                                                ndp->ni_vp = NULL;
                                                error = NFSERR_NOTSUPP;
                                        }
                                }
                        }
                /*
                 * NFS V2 Only. nfsrvd_mknod() does this for V3.
                 * (This implies, just get out on an error.)
                 */
                } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
                        nvap->na_type == VFIFO) {
                        if (nvap->na_type == VCHR && rdev == 0xffffffff)
                                nvap->na_type = VFIFO;
                        if (nvap->na_type != VFIFO &&
                            (error = priv_check_cred(nd->nd_cred, PRIV_VFS_MKNOD_DEV))) {
                                vrele(ndp->ni_startdir);
                                nfsvno_relpathbuf(ndp);
                                vput(ndp->ni_dvp);
                                goto out;
                        }
                        nvap->na_rdev = rdev;
                        error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
                            &ndp->ni_cnd, &nvap->na_vattr);
                        VOP_VPUT_PAIR(ndp->ni_dvp, error == 0 ? &ndp->ni_vp :
                            NULL, false);
                        nfsvno_relpathbuf(ndp);
                        vrele(ndp->ni_startdir);
                        if (error)
                                goto out;
                } else {
                        vrele(ndp->ni_startdir);
                        nfsvno_relpathbuf(ndp);
                        vput(ndp->ni_dvp);
                        error = ENXIO;
                        goto out;
                }
                *vpp = ndp->ni_vp;
        } else {
                /*
                 * Handle cases where error is already set and/or
                 * the file exists.
                 * 1 - clean up the lookup
                 * 2 - iff !error and na_size set, truncate it
                 */
                vrele(ndp->ni_startdir);
                nfsvno_relpathbuf(ndp);
                *vpp = ndp->ni_vp;
                if (ndp->ni_dvp == *vpp)
                        vrele(ndp->ni_dvp);
                else
                        vput(ndp->ni_dvp);
                if (!error && nvap->na_size != VNOVAL) {
                        error = nfsvno_accchk(*vpp, VWRITE,
                            nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
                            NFSACCCHK_VPISLOCKED, NULL);
                        if (!error) {
                                tempsize = nvap->na_size;
                                NFSVNO_ATTRINIT(nvap);
                                nvap->na_size = tempsize;
                                error = VOP_SETATTR(*vpp,
                                    &nvap->na_vattr, nd->nd_cred);
                        }
                }
                if (error)
                        vput(*vpp);
        }

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Do a mknod vnode op.
 */
int
nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
    struct thread *p)
{
        int error = 0;
        enum vtype vtyp;

        vtyp = nvap->na_type;
        /*
         * Iff doesn't exist, create it.
         */
        if (ndp->ni_vp) {
                vrele(ndp->ni_startdir);
                nfsvno_relpathbuf(ndp);
                vput(ndp->ni_dvp);
                vrele(ndp->ni_vp);
                error = EEXIST;
                goto out;
        }
        if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
                vrele(ndp->ni_startdir);
                nfsvno_relpathbuf(ndp);
                vput(ndp->ni_dvp);
                error = NFSERR_BADTYPE;
                goto out;
        }
        if (vtyp == VSOCK) {
                vrele(ndp->ni_startdir);
                error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
                    &ndp->ni_cnd, &nvap->na_vattr);
                VOP_VPUT_PAIR(ndp->ni_dvp, error == 0 ? &ndp->ni_vp : NULL,
                    false);
                nfsvno_relpathbuf(ndp);
        } else {
                if (nvap->na_type != VFIFO &&
                    (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV))) {
                        vrele(ndp->ni_startdir);
                        nfsvno_relpathbuf(ndp);
                        vput(ndp->ni_dvp);
                        goto out;
                }
                error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
                    &ndp->ni_cnd, &nvap->na_vattr);
                VOP_VPUT_PAIR(ndp->ni_dvp, error == 0 ? &ndp->ni_vp : NULL,
                    false);
                nfsvno_relpathbuf(ndp);
                vrele(ndp->ni_startdir);
                /*
                 * Since VOP_MKNOD returns the ni_vp, I can't
                 * see any reason to do the lookup.
                 */
        }

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Mkdir vnode op.
 */
int
nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
    struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
{
        int error = 0;

        if (ndp->ni_vp != NULL) {
                if (ndp->ni_dvp == ndp->ni_vp)
                        vrele(ndp->ni_dvp);
                else
                        vput(ndp->ni_dvp);
                vrele(ndp->ni_vp);
                nfsvno_relpathbuf(ndp);
                error = EEXIST;
                goto out;
        }
        error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
            &nvap->na_vattr);
        VOP_VPUT_PAIR(ndp->ni_dvp, error == 0 ? &ndp->ni_vp : NULL, false);
        nfsvno_relpathbuf(ndp);

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * symlink vnode op.
 */
int
nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
    int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
    struct nfsexstuff *exp)
{
        int error = 0;

        if (ndp->ni_vp) {
                vrele(ndp->ni_startdir);
                nfsvno_relpathbuf(ndp);
                if (ndp->ni_dvp == ndp->ni_vp)
                        vrele(ndp->ni_dvp);
                else
                        vput(ndp->ni_dvp);
                vrele(ndp->ni_vp);
                error = EEXIST;
                goto out;
        }

        error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
            &nvap->na_vattr, pathcp);
        /*
         * Although FreeBSD still had the lookup code in
         * it for 7/current, there doesn't seem to be any
         * point, since VOP_SYMLINK() returns the ni_vp.
         * Just vput it for v2.
         */
        VOP_VPUT_PAIR(ndp->ni_dvp, &ndp->ni_vp, !not_v2 && error == 0);
        vrele(ndp->ni_startdir);
        nfsvno_relpathbuf(ndp);

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Parse symbolic link arguments.
 * This function has an ugly side effect. It will malloc() an area for
 * the symlink and set iov_base to point to it, only if it succeeds.
 * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
 * be FREE'd later.
 */
int
nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
    struct thread *p, char **pathcpp, int *lenp)
{
        u_int32_t *tl;
        char *pathcp = NULL;
        int error = 0, len;
        struct nfsv2_sattr *sp;

        *pathcpp = NULL;
        *lenp = 0;
        if ((nd->nd_flag & ND_NFSV3) &&
            (error = nfsrv_sattr(nd, NULL, nvap, NULL, NULL, p)))
                goto nfsmout;
        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
        len = fxdr_unsigned(int, *tl);
        if (len > NFS_MAXPATHLEN || len <= 0) {
                error = EBADRPC;
                goto nfsmout;
        }
        pathcp = malloc(len + 1, M_TEMP, M_WAITOK);
        error = nfsrv_mtostr(nd, pathcp, len);
        if (error)
                goto nfsmout;
        if (nd->nd_flag & ND_NFSV2) {
                NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
                nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
        }
        *pathcpp = pathcp;
        *lenp = len;
        NFSEXITCODE2(0, nd);
        return (0);
nfsmout:
        if (pathcp)
                free(pathcp, M_TEMP);
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Remove a non-directory object.
 */
int
nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
    struct thread *p, struct nfsexstuff *exp)
{
        struct vnode *vp, *dsdvp[NFSDEV_MAXMIRRORS];
        int error = 0, mirrorcnt;
        char fname[PNFS_FILENAME_LEN + 1];
        fhandle_t fh;

        vp = ndp->ni_vp;
        dsdvp[0] = NULL;
        if (vp->v_type == VDIR)
                error = NFSERR_ISDIR;
        else if (is_v4)
                error = nfsrv_checkremove(vp, 1, NULL, (nfsquad_t)((u_quad_t)0),
                    p);
        if (error == 0)
                nfsrv_pnfsremovesetup(vp, p, dsdvp, &mirrorcnt, fname, &fh);
        if (!error)
                error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
        if (error == 0 && dsdvp[0] != NULL)
                nfsrv_pnfsremove(dsdvp, mirrorcnt, fname, &fh, p);
        if (ndp->ni_dvp == vp)
                vrele(ndp->ni_dvp);
        else
                vput(ndp->ni_dvp);
        vput(vp);
        if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
                nfsvno_relpathbuf(ndp);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Remove a directory.
 */
int
nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
    struct thread *p, struct nfsexstuff *exp)
{
        struct vnode *vp;
        int error = 0;

        vp = ndp->ni_vp;
        if (vp->v_type != VDIR) {
                error = ENOTDIR;
                goto out;
        }
        /*
         * No rmdir "." please.
         */
        if (ndp->ni_dvp == vp) {
                error = EINVAL;
                goto out;
        }
        /*
         * The root of a mounted filesystem cannot be deleted.
         */
        if (vp->v_vflag & VV_ROOT)
                error = EBUSY;
out:
        if (!error)
                error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
        if (ndp->ni_dvp == vp)
                vrele(ndp->ni_dvp);
        else
                vput(ndp->ni_dvp);
        vput(vp);
        if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
                nfsvno_relpathbuf(ndp);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Rename vnode op.
 */
int
nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
    u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
{
        struct vnode *fvp, *tvp, *tdvp, *dsdvp[NFSDEV_MAXMIRRORS];
        int error = 0, mirrorcnt;
        char fname[PNFS_FILENAME_LEN + 1];
        fhandle_t fh;

        dsdvp[0] = NULL;
        fvp = fromndp->ni_vp;
        if (ndstat) {
                vrele(fromndp->ni_dvp);
                vrele(fvp);
                error = ndstat;
                goto out1;
        }
        tdvp = tondp->ni_dvp;
        tvp = tondp->ni_vp;
        if (tvp != NULL) {
                if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
                        error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
                        goto out;
                } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
                        error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
                        goto out;
                }
                if (tvp->v_type == VDIR && tvp->v_mountedhere) {
                        error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
                        goto out;
                }

                /*
                 * A rename to '.' or '..' results in a prematurely
                 * unlocked vnode on FreeBSD5, so I'm just going to fail that
                 * here.
                 */
                if ((tondp->ni_cnd.cn_namelen == 1 &&
                     tondp->ni_cnd.cn_nameptr[0] == '.') ||
                    (tondp->ni_cnd.cn_namelen == 2 &&
                     tondp->ni_cnd.cn_nameptr[0] == '.' &&
                     tondp->ni_cnd.cn_nameptr[1] == '.')) {
                        error = EINVAL;
                        goto out;
                }
        }
        if (fvp->v_type == VDIR && fvp->v_mountedhere) {
                error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
                goto out;
        }
        if (fvp->v_mount != tdvp->v_mount) {
                error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
                goto out;
        }
        if (fvp == tdvp) {
                error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
                goto out;
        }
        if (fvp == tvp) {
                /*
                 * If source and destination are the same, there is nothing to
                 * do. Set error to -1 to indicate this.
                 */
                error = -1;
                goto out;
        }
        if (ndflag & ND_NFSV4) {
                if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
                        error = nfsrv_checkremove(fvp, 0, NULL,
                            (nfsquad_t)((u_quad_t)0), p);
                        NFSVOPUNLOCK(fvp);
                } else
                        error = EPERM;
                if (tvp && !error)
                        error = nfsrv_checkremove(tvp, 1, NULL,
                            (nfsquad_t)((u_quad_t)0), p);
        } else {
                /*
                 * For NFSv2 and NFSv3, try to get rid of the delegation, so
                 * that the NFSv4 client won't be confused by the rename.
                 * Since nfsd_recalldelegation() can only be called on an
                 * unlocked vnode at this point and fvp is the file that will
                 * still exist after the rename, just do fvp.
                 */
                nfsd_recalldelegation(fvp, p);
        }
        if (error == 0 && tvp != NULL) {
                nfsrv_pnfsremovesetup(tvp, p, dsdvp, &mirrorcnt, fname, &fh);
                NFSD_DEBUG(4, "nfsvno_rename: pnfsremovesetup"
                    " dsdvp=%p\n", dsdvp[0]);
        }
out:
        if (!error) {
                error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
                    &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
                    &tondp->ni_cnd);
        } else {
                if (tdvp == tvp)
                        vrele(tdvp);
                else
                        vput(tdvp);
                if (tvp)
                        vput(tvp);
                vrele(fromndp->ni_dvp);
                vrele(fvp);
                if (error == -1)
                        error = 0;
        }

        /*
         * If dsdvp[0] != NULL, it was set up by nfsrv_pnfsremovesetup() and
         * if the rename succeeded, the DS file for the tvp needs to be
         * removed.
         */
        if (error == 0 && dsdvp[0] != NULL) {
                nfsrv_pnfsremove(dsdvp, mirrorcnt, fname, &fh, p);
                NFSD_DEBUG(4, "nfsvno_rename: pnfsremove\n");
        }

        vrele(tondp->ni_startdir);
        nfsvno_relpathbuf(tondp);
out1:
        vrele(fromndp->ni_startdir);
        nfsvno_relpathbuf(fromndp);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Link vnode op.
 */
int
nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
    struct thread *p, struct nfsexstuff *exp)
{
        struct vnode *xp;
        int error = 0;

        xp = ndp->ni_vp;
        if (xp != NULL) {
                error = EEXIST;
        } else {
                xp = ndp->ni_dvp;
                if (vp->v_mount != xp->v_mount)
                        error = EXDEV;
        }
        if (!error) {
                NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
                if (!VN_IS_DOOMED(vp))
                        error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
                else
                        error = EPERM;
                if (ndp->ni_dvp == vp) {
                        vrele(ndp->ni_dvp);
                        NFSVOPUNLOCK(vp);
                } else {
                        vref(vp);
                        VOP_VPUT_PAIR(ndp->ni_dvp, &vp, true);
                }
        } else {
                if (ndp->ni_dvp == ndp->ni_vp)
                        vrele(ndp->ni_dvp);
                else
                        vput(ndp->ni_dvp);
                if (ndp->ni_vp)
                        vrele(ndp->ni_vp);
        }
        nfsvno_relpathbuf(ndp);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Do the fsync() appropriate for the commit.
 */
int
nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
    struct thread *td)
{
        int error = 0;

        /*
         * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
         * file is done.  At this time VOP_FSYNC does not accept offset and
         * byte count parameters so call VOP_FSYNC the whole file for now.
         * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
         * File systems that do not use the buffer cache (as indicated
         * by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
         */
        if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
            (vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
                /*
                 * Give up and do the whole thing
                 */
                if (vp->v_object && vm_object_mightbedirty(vp->v_object)) {
                        VM_OBJECT_WLOCK(vp->v_object);
                        vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
                        VM_OBJECT_WUNLOCK(vp->v_object);
                }
                error = VOP_FSYNC(vp, MNT_WAIT, td);
        } else {
                /*
                 * Locate and synchronously write any buffers that fall
                 * into the requested range.  Note:  we are assuming that
                 * f_iosize is a power of 2.
                 */
                int iosize = vp->v_mount->mnt_stat.f_iosize;
                int iomask = iosize - 1;
                struct bufobj *bo;
                daddr_t lblkno;

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

                if (vp->v_object && vm_object_mightbedirty(vp->v_object)) {
                        VM_OBJECT_WLOCK(vp->v_object);
                        vm_object_page_clean(vp->v_object, off, off + cnt,
                            OBJPC_SYNC);
                        VM_OBJECT_WUNLOCK(vp->v_object);
                }

                bo = &vp->v_bufobj;
                BO_LOCK(bo);
                while (cnt > 0) {
                        struct buf *bp;

                        /*
                         * If we have a buffer and it is marked B_DELWRI we
                         * have to lock and write it.  Otherwise the prior
                         * write is assumed to have already been committed.
                         *
                         * gbincore() can return invalid buffers now so we
                         * have to check that bit as well (though B_DELWRI
                         * should not be set if B_INVAL is set there could be
                         * a race here since we haven't locked the buffer).
                         */
                        if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
                                if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
                                    LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
                                        BO_LOCK(bo);
                                        continue; /* retry */
                                }
                                if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
                                    B_DELWRI) {
                                        bremfree(bp);
                                        bp->b_flags &= ~B_ASYNC;
                                        bwrite(bp);
                                        ++nfs_commit_miss;
                                } else
                                        BUF_UNLOCK(bp);
                                BO_LOCK(bo);
                        }
                        ++nfs_commit_blks;
                        if (cnt < iosize)
                                break;
                        cnt -= iosize;
                        ++lblkno;
                }
                BO_UNLOCK(bo);
        }
        NFSEXITCODE(error);
        return (error);
}

/*
 * Statfs vnode op.
 */
int
nfsvno_statfs(struct vnode *vp, struct statfs *sf)
{
        struct statfs *tsf;
        int error;

        tsf = NULL;
        if (nfsrv_devidcnt > 0) {
                /* For a pNFS service, get the DS numbers. */
                tsf = malloc(sizeof(*tsf), M_TEMP, M_WAITOK | M_ZERO);
                error = nfsrv_pnfsstatfs(tsf, vp->v_mount);
                if (error != 0) {
                        free(tsf, M_TEMP);
                        tsf = NULL;
                }
        }
        error = VFS_STATFS(vp->v_mount, sf);
        if (error == 0) {
                if (tsf != NULL) {
                        sf->f_blocks = tsf->f_blocks;
                        sf->f_bavail = tsf->f_bavail;
                        sf->f_bfree = tsf->f_bfree;
                        sf->f_bsize = tsf->f_bsize;
                }
                /*
                 * Since NFS handles these values as unsigned on the
                 * wire, there is no way to represent negative values,
                 * so set them to 0. Without this, they will appear
                 * to be very large positive values for clients like
                 * Solaris10.
                 */
                if (sf->f_bavail < 0)
                        sf->f_bavail = 0;
                if (sf->f_ffree < 0)
                        sf->f_ffree = 0;
        }
        free(tsf, M_TEMP);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
 * must handle nfsrv_opencheck() calls after any other access checks.
 */
void
nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
    nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
    int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
    NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred,
    struct nfsexstuff *exp, struct vnode **vpp)
{
        struct vnode *vp = NULL;
        u_quad_t tempsize;
        struct nfsexstuff nes;
        struct thread *p = curthread;

        if (ndp->ni_vp == NULL)
                nd->nd_repstat = nfsrv_opencheck(clientid,
                    stateidp, stp, NULL, nd, p, nd->nd_repstat);
        if (!nd->nd_repstat) {
                if (ndp->ni_vp == NULL) {
                        vrele(ndp->ni_startdir);
                        nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
                            &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
                        /* For a pNFS server, create the data file on a DS. */
                        if (nd->nd_repstat == 0) {
                                /*
                                 * Create a data file on a DS for a pNFS server.
                                 * This function just returns if not
                                 * running a pNFS DS or the creation fails.
                                 */
                                nfsrv_pnfscreate(ndp->ni_vp, &nvap->na_vattr,
                                    cred, p);
                        }
                        VOP_VPUT_PAIR(ndp->ni_dvp, nd->nd_repstat == 0 ?
                            &ndp->ni_vp : NULL, false);
                        nfsvno_relpathbuf(ndp);
                        if (!nd->nd_repstat) {
                                if (*exclusive_flagp) {
                                        *exclusive_flagp = 0;
                                        NFSVNO_ATTRINIT(nvap);
                                        nvap->na_atime.tv_sec = cverf[0];
                                        nvap->na_atime.tv_nsec = cverf[1];
                                        nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
                                            &nvap->na_vattr, cred);
                                        if (nd->nd_repstat != 0) {
                                                vput(ndp->ni_vp);
                                                ndp->ni_vp = NULL;
                                                nd->nd_repstat = NFSERR_NOTSUPP;
                                        } else
                                                NFSSETBIT_ATTRBIT(attrbitp,
                                                    NFSATTRBIT_TIMEACCESS);
                                } else {
                                        nfsrv_fixattr(nd, ndp->ni_vp, nvap,
                                            aclp, p, attrbitp, exp);
                                }
                        }
                        vp = ndp->ni_vp;
                } else {
                        if (ndp->ni_startdir)
                                vrele(ndp->ni_startdir);
                        nfsvno_relpathbuf(ndp);
                        vp = ndp->ni_vp;
                        if (create == NFSV4OPEN_CREATE) {
                                if (ndp->ni_dvp == vp)
                                        vrele(ndp->ni_dvp);
                                else
                                        vput(ndp->ni_dvp);
                        }
                        if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
                                if (ndp->ni_cnd.cn_flags & RDONLY)
                                        NFSVNO_SETEXRDONLY(&nes);
                                else
                                        NFSVNO_EXINIT(&nes);
                                nd->nd_repstat = nfsvno_accchk(vp, 
                                    VWRITE, cred, &nes, p,
                                    NFSACCCHK_NOOVERRIDE,
                                    NFSACCCHK_VPISLOCKED, NULL);
                                nd->nd_repstat = nfsrv_opencheck(clientid,
                                    stateidp, stp, vp, nd, p, nd->nd_repstat);
                                if (!nd->nd_repstat) {
                                        tempsize = nvap->na_size;
                                        NFSVNO_ATTRINIT(nvap);
                                        nvap->na_size = tempsize;
                                        nd->nd_repstat = VOP_SETATTR(vp,
                                            &nvap->na_vattr, cred);
                                }
                        } else if (vp->v_type == VREG) {
                                nd->nd_repstat = nfsrv_opencheck(clientid,
                                    stateidp, stp, vp, nd, p, nd->nd_repstat);
                        }
                }
        } else {
                if (ndp->ni_cnd.cn_flags & HASBUF)
                        nfsvno_relpathbuf(ndp);
                if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
                        vrele(ndp->ni_startdir);
                        if (ndp->ni_dvp == ndp->ni_vp)
                                vrele(ndp->ni_dvp);
                        else
                                vput(ndp->ni_dvp);
                        if (ndp->ni_vp)
                                vput(ndp->ni_vp);
                }
        }
        *vpp = vp;

        NFSEXITCODE2(0, nd);
}

/*
 * Updates the file rev and sets the mtime and ctime
 * to the current clock time, returning the va_filerev and va_Xtime
 * values.
 * Return ESTALE to indicate the vnode is VIRF_DOOMED.
 */
int
nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
    struct nfsrv_descript *nd, struct thread *p)
{
        struct vattr va;

        VATTR_NULL(&va);
        vfs_timestamp(&va.va_mtime);
        if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
                NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
                if (VN_IS_DOOMED(vp))
                        return (ESTALE);
        }
        (void) VOP_SETATTR(vp, &va, nd->nd_cred);
        (void) nfsvno_getattr(vp, nvap, nd, p, 1, NULL);
        return (0);
}

/*
 * Glue routine to nfsv4_fillattr().
 */
int
nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
    struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
    struct ucred *cred, struct thread *p, int isdgram, int reterr,
    int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
{
        struct statfs *sf;
        int error;

        sf = NULL;
        if (nfsrv_devidcnt > 0 &&
            (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SPACEAVAIL) ||
             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SPACEFREE) ||
             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SPACETOTAL))) {
                sf = malloc(sizeof(*sf), M_TEMP, M_WAITOK | M_ZERO);
                error = nfsrv_pnfsstatfs(sf, mp);
                if (error != 0) {
                        free(sf, M_TEMP);
                        sf = NULL;
                }
        }
        error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
            attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
            mounted_on_fileno, sf);
        free(sf, M_TEMP);
        NFSEXITCODE2(0, nd);
        return (error);
}

/* Since the Readdir vnode ops vary, put the entire functions in here. */
/*
 * nfs readdir service
 * - mallocs what it thinks is enough to read
 *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
 * - calls VOP_READDIR()
 * - loops around building the reply
 *      if the output generated exceeds count break out of loop
 *      The NFSM_CLGET macro is used here so that the reply will be packed
 *      tightly in mbuf clusters.
 * - it trims out records with d_fileno == 0
 *      this doesn't matter for Unix clients, but they might confuse clients
 *      for other os'.
 * - it trims out records with d_type == DT_WHT
 *      these cannot be seen through NFS (unless we extend the protocol)
 *     The alternate call nfsrvd_readdirplus() does lookups as well.
 * PS: The NFS protocol spec. does not clarify what the "count" byte
 *      argument is a count of.. just name strings and file id's or the
 *      entire reply rpc or ...
 *      I tried just file name and id sizes and it confused the Sun client,
 *      so I am using the full rpc size now. The "paranoia.." comment refers
 *      to including the status longwords that are not a part of the dir.
 *      "entry" structures, but are in the rpc.
 */
int
nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
    struct vnode *vp, struct nfsexstuff *exp)
{
        struct dirent *dp;
        u_int32_t *tl;
        int dirlen;
        char *cpos, *cend, *rbuf;
        struct nfsvattr at;
        int nlen, error = 0, getret = 1;
        int siz, cnt, fullsiz, eofflag, ncookies;
        u_int64_t off, toff, verf __unused;
        u_long *cookies = NULL, *cookiep;
        struct uio io;
        struct iovec iv;
        int is_ufs;
        struct thread *p = curthread;

        if (nd->nd_repstat) {
                nfsrv_postopattr(nd, getret, &at);
                goto out;
        }
        if (nd->nd_flag & ND_NFSV2) {
                NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                off = fxdr_unsigned(u_quad_t, *tl++);
        } else {
                NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
                off = fxdr_hyper(tl);
                tl += 2;
                verf = fxdr_hyper(tl);
                tl += 2;
        }
        toff = off;
        cnt = fxdr_unsigned(int, *tl);
        if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
                cnt = NFS_SRVMAXDATA(nd);
        siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
        fullsiz = siz;
        if (nd->nd_flag & ND_NFSV3) {
                nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd, p, 1,
                    NULL);
#if 0
                /*
                 * va_filerev is not sufficient as a cookie verifier,
                 * since it is not supposed to change when entries are
                 * removed/added unless that offset cookies returned to
                 * the client are no longer valid.
                 */
                if (!nd->nd_repstat && toff && verf != at.na_filerev)
                        nd->nd_repstat = NFSERR_BAD_COOKIE;
#endif
        }
        if (!nd->nd_repstat && vp->v_type != VDIR)
                nd->nd_repstat = NFSERR_NOTDIR;
        if (nd->nd_repstat == 0 && cnt == 0) {
                if (nd->nd_flag & ND_NFSV2)
                        /* NFSv2 does not have NFSERR_TOOSMALL */
                        nd->nd_repstat = EPERM;
                else
                        nd->nd_repstat = NFSERR_TOOSMALL;
        }
        if (!nd->nd_repstat)
                nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
                    nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
                    NFSACCCHK_VPISLOCKED, NULL);
        if (nd->nd_repstat) {
                vput(vp);
                if (nd->nd_flag & ND_NFSV3)
                        nfsrv_postopattr(nd, getret, &at);
                goto out;
        }
        is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
        rbuf = malloc(siz, M_TEMP, M_WAITOK);
again:
        eofflag = 0;
        if (cookies) {
                free(cookies, M_TEMP);
                cookies = NULL;
        }

        iv.iov_base = rbuf;
        iv.iov_len = siz;
        io.uio_iov = &iv;
        io.uio_iovcnt = 1;
        io.uio_offset = (off_t)off;
        io.uio_resid = siz;
        io.uio_segflg = UIO_SYSSPACE;
        io.uio_rw = UIO_READ;
        io.uio_td = NULL;
        nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
            &cookies);
        off = (u_int64_t)io.uio_offset;
        if (io.uio_resid)
                siz -= io.uio_resid;

        if (!cookies && !nd->nd_repstat)
                nd->nd_repstat = NFSERR_PERM;
        if (nd->nd_flag & ND_NFSV3) {
                getret = nfsvno_getattr(vp, &at, nd, p, 1, NULL);
                if (!nd->nd_repstat)
                        nd->nd_repstat = getret;
        }

        /*
         * Handles the failed cases. nd->nd_repstat == 0 past here.
         */
        if (nd->nd_repstat) {
                vput(vp);
                free(rbuf, M_TEMP);
                if (cookies)
                        free(cookies, M_TEMP);
                if (nd->nd_flag & ND_NFSV3)
                        nfsrv_postopattr(nd, getret, &at);
                goto out;
        }
        /*
         * If nothing read, return eof
         * rpc reply
         */
        if (siz == 0) {
                vput(vp);
                if (nd->nd_flag & ND_NFSV2) {
                        NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                } else {
                        nfsrv_postopattr(nd, getret, &at);
                        NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                        txdr_hyper(at.na_filerev, tl);
                        tl += 2;
                }
                *tl++ = newnfs_false;
                *tl = newnfs_true;
                free(rbuf, M_TEMP);
                free(cookies, M_TEMP);
                goto out;
        }

        /*
         * Check for degenerate cases of nothing useful read.
         * If so go try again
         */
        cpos = rbuf;
        cend = rbuf + siz;
        dp = (struct dirent *)cpos;
        cookiep = cookies;

        /*
         * For some reason FreeBSD's ufs_readdir() chooses to back the
         * directory offset up to a block boundary, so it is necessary to
         * skip over the records that precede the requested offset. This
         * requires the assumption that file offset cookies monotonically
         * increase.
         */
        while (cpos < cend && ncookies > 0 &&
            (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
             (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
                cpos += dp->d_reclen;
                dp = (struct dirent *)cpos;
                cookiep++;
                ncookies--;
        }
        if (cpos >= cend || ncookies == 0) {
                siz = fullsiz;
                toff = off;
                goto again;
        }
        vput(vp);

        /*
         * If cnt > MCLBYTES and the reply will not be saved, use
         * ext_pgs mbufs for TLS.
         * For NFSv4.0, we do not know for sure if the reply will
         * be saved, so do not use ext_pgs mbufs for NFSv4.0.
         */
        if (cnt > MCLBYTES && siz > MCLBYTES &&
            (nd->nd_flag & (ND_TLS | ND_EXTPG | ND_SAVEREPLY)) == ND_TLS &&
            (nd->nd_flag & (ND_NFSV4 | ND_NFSV41)) != ND_NFSV4)
                nd->nd_flag |= ND_EXTPG;

        /*
         * dirlen is the size of the reply, including all XDR and must
         * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
         * if the XDR should be included in "count", but to be safe, we do.
         * (Include the two booleans at the end of the reply in dirlen now.)
         */
        if (nd->nd_flag & ND_NFSV3) {
                nfsrv_postopattr(nd, getret, &at);
                NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                txdr_hyper(at.na_filerev, tl);
                dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
        } else {
                dirlen = 2 * NFSX_UNSIGNED;
        }

        /* Loop through the records and build reply */
        while (cpos < cend && ncookies > 0) {
                nlen = dp->d_namlen;
                if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
                        nlen <= NFS_MAXNAMLEN) {
                        if (nd->nd_flag & ND_NFSV3)
                                dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
                        else
                                dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
                        if (dirlen > cnt) {
                                eofflag = 0;
                                break;
                        }

                        /*
                         * Build the directory record xdr from
                         * the dirent entry.
                         */
                        if (nd->nd_flag & ND_NFSV3) {
                                NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
                                *tl++ = newnfs_true;
                                *tl++ = 0;
                        } else {
                                NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                                *tl++ = newnfs_true;
                        }
                        *tl = txdr_unsigned(dp->d_fileno);
                        (void) nfsm_strtom(nd, dp->d_name, nlen);
                        if (nd->nd_flag & ND_NFSV3) {
                                NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                                *tl++ = 0;
                        } else
                                NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
                        *tl = txdr_unsigned(*cookiep);
                }
                cpos += dp->d_reclen;
                dp = (struct dirent *)cpos;
                cookiep++;
                ncookies--;
        }
        if (cpos < cend)
                eofflag = 0;
        NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
        *tl++ = newnfs_false;
        if (eofflag)
                *tl = newnfs_true;
        else
                *tl = newnfs_false;
        free(rbuf, M_TEMP);
        free(cookies, M_TEMP);

out:
        NFSEXITCODE2(0, nd);
        return (0);
nfsmout:
        vput(vp);
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Readdirplus for V3 and Readdir for V4.
 */
int
nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
    struct vnode *vp, struct nfsexstuff *exp)
{
        struct dirent *dp;
        u_int32_t *tl;
        int dirlen;
        char *cpos, *cend, *rbuf;
        struct vnode *nvp;
        fhandle_t nfh;
        struct nfsvattr nva, at, *nvap = &nva;
        struct mbuf *mb0, *mb1;
        struct nfsreferral *refp;
        int nlen, r, error = 0, getret = 1, usevget = 1;
        int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
        caddr_t bpos0, bpos1;
        u_int64_t off, toff, verf;
        u_long *cookies = NULL, *cookiep;
        nfsattrbit_t attrbits, rderrbits, savbits;
        struct uio io;
        struct iovec iv;
        struct componentname cn;
        int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
        struct mount *mp, *new_mp;
        uint64_t mounted_on_fileno;
        struct thread *p = curthread;
        int bextpg0, bextpg1, bextpgsiz0, bextpgsiz1;

        if (nd->nd_repstat) {
                nfsrv_postopattr(nd, getret, &at);
                goto out;
        }
        NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
        off = fxdr_hyper(tl);
        toff = off;
        tl += 2;
        verf = fxdr_hyper(tl);
        tl += 2;
        siz = fxdr_unsigned(int, *tl++);
        cnt = fxdr_unsigned(int, *tl);

        /*
         * Use the server's maximum data transfer size as the upper bound
         * on reply datalen.
         */
        if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
                cnt = NFS_SRVMAXDATA(nd);

        /*
         * siz is a "hint" of how much directory information (name, fileid,
         * cookie) should be in the reply. At least one client "hints" 0,
         * so I set it to cnt for that case. I also round it up to the
         * next multiple of DIRBLKSIZ.
         * Since the size of a Readdirplus directory entry reply will always
         * be greater than a directory entry returned by VOP_READDIR(), it
         * does not make sense to read more than NFS_SRVMAXDATA() via
         * VOP_READDIR().
         */
        if (siz <= 0)
                siz = cnt;
        else if (siz > NFS_SRVMAXDATA(nd))
                siz = NFS_SRVMAXDATA(nd);
        siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));

        if (nd->nd_flag & ND_NFSV4) {
                error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
                if (error)
                        goto nfsmout;
                NFSSET_ATTRBIT(&savbits, &attrbits);
                NFSCLRNOTFILLABLE_ATTRBIT(&attrbits, nd);
                NFSZERO_ATTRBIT(&rderrbits);
                NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
        } else {
                NFSZERO_ATTRBIT(&attrbits);
        }
        fullsiz = siz;
        nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd, p, 1, NULL);
#if 0
        if (!nd->nd_repstat) {
            if (off && verf != at.na_filerev) {
                /*
                 * va_filerev is not sufficient as a cookie verifier,
                 * since it is not supposed to change when entries are
                 * removed/added unless that offset cookies returned to
                 * the client are no longer valid.
                 */
                if (nd->nd_flag & ND_NFSV4) {
                        nd->nd_repstat = NFSERR_NOTSAME;
                } else {
                        nd->nd_repstat = NFSERR_BAD_COOKIE;
                }
            }
        }
#endif
        if (!nd->nd_repstat && vp->v_type != VDIR)
                nd->nd_repstat = NFSERR_NOTDIR;
        if (!nd->nd_repstat && cnt == 0)
                nd->nd_repstat = NFSERR_TOOSMALL;
        if (!nd->nd_repstat)
                nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
                    nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
                    NFSACCCHK_VPISLOCKED, NULL);
        if (nd->nd_repstat) {
                vput(vp);
                if (nd->nd_flag & ND_NFSV3)
                        nfsrv_postopattr(nd, getret, &at);
                goto out;
        }
        is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
        is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;

        rbuf = malloc(siz, M_TEMP, M_WAITOK);
again:
        eofflag = 0;
        if (cookies) {
                free(cookies, M_TEMP);
                cookies = NULL;
        }

        iv.iov_base = rbuf;
        iv.iov_len = siz;
        io.uio_iov = &iv;
        io.uio_iovcnt = 1;
        io.uio_offset = (off_t)off;
        io.uio_resid = siz;
        io.uio_segflg = UIO_SYSSPACE;
        io.uio_rw = UIO_READ;
        io.uio_td = NULL;
        nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
            &cookies);
        off = (u_int64_t)io.uio_offset;
        if (io.uio_resid)
                siz -= io.uio_resid;

        getret = nfsvno_getattr(vp, &at, nd, p, 1, NULL);

        if (!cookies && !nd->nd_repstat)
                nd->nd_repstat = NFSERR_PERM;
        if (!nd->nd_repstat)
                nd->nd_repstat = getret;
        if (nd->nd_repstat) {
                vput(vp);
                if (cookies)
                        free(cookies, M_TEMP);
                free(rbuf, M_TEMP);
                if (nd->nd_flag & ND_NFSV3)
                        nfsrv_postopattr(nd, getret, &at);
                goto out;
        }
        /*
         * If nothing read, return eof
         * rpc reply
         */
        if (siz == 0) {
                vput(vp);
                if (nd->nd_flag & ND_NFSV3)
                        nfsrv_postopattr(nd, getret, &at);
                NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
                txdr_hyper(at.na_filerev, tl);
                tl += 2;
                *tl++ = newnfs_false;
                *tl = newnfs_true;
                free(cookies, M_TEMP);
                free(rbuf, M_TEMP);
                goto out;
        }

        /*
         * Check for degenerate cases of nothing useful read.
         * If so go try again
         */
        cpos = rbuf;
        cend = rbuf + siz;
        dp = (struct dirent *)cpos;
        cookiep = cookies;

        /*
         * For some reason FreeBSD's ufs_readdir() chooses to back the
         * directory offset up to a block boundary, so it is necessary to
         * skip over the records that precede the requested offset. This
         * requires the assumption that file offset cookies monotonically
         * increase.
         */
        while (cpos < cend && ncookies > 0 &&
          (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
           (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
           ((nd->nd_flag & ND_NFSV4) &&
            ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
             (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
                cpos += dp->d_reclen;
                dp = (struct dirent *)cpos;
                cookiep++;
                ncookies--;
        }
        if (cpos >= cend || ncookies == 0) {
                siz = fullsiz;
                toff = off;
                goto again;
        }

        /*
         * Busy the file system so that the mount point won't go away
         * and, as such, VFS_VGET() can be used safely.
         */
        mp = vp->v_mount;
        vfs_ref(mp);
        NFSVOPUNLOCK(vp);
        nd->nd_repstat = vfs_busy(mp, 0);
        vfs_rel(mp);
        if (nd->nd_repstat != 0) {
                vrele(vp);
                free(cookies, M_TEMP);
                free(rbuf, M_TEMP);
                if (nd->nd_flag & ND_NFSV3)
                        nfsrv_postopattr(nd, getret, &at);
                goto out;
        }

        /*
         * Check to see if entries in this directory can be safely acquired
         * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
         * ZFS snapshot directories need VOP_LOOKUP(), so that any
         * automount of the snapshot directory that is required will
         * be done.
         * This needs to be done here for NFSv4, since NFSv4 never does
         * a VFS_VGET() for "." or "..".
         */
        if (is_zfs == 1) {
                r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
                if (r == EOPNOTSUPP) {
                        usevget = 0;
                        cn.cn_nameiop = LOOKUP;
                        cn.cn_lkflags = LK_SHARED | LK_RETRY;
                        cn.cn_cred = nd->nd_cred;
                        cn.cn_thread = p;
                } else if (r == 0)
                        vput(nvp);
        }

        /*
         * If the reply is likely to exceed MCLBYTES and the reply will
         * not be saved, use ext_pgs mbufs for TLS.
         * It is difficult to predict how large each entry will be and
         * how many entries have been read, so just assume the directory
         * entries grow by a factor of 4 when attributes are included.
         * For NFSv4.0, we do not know for sure if the reply will
         * be saved, so do not use ext_pgs mbufs for NFSv4.0.
         */
        if (cnt > MCLBYTES && siz > MCLBYTES / 4 &&
            (nd->nd_flag & (ND_TLS | ND_EXTPG | ND_SAVEREPLY)) == ND_TLS &&
            (nd->nd_flag & (ND_NFSV4 | ND_NFSV41)) != ND_NFSV4)
                nd->nd_flag |= ND_EXTPG;

        /*
         * Save this position, in case there is an error before one entry
         * is created.
         */
        mb0 = nd->nd_mb;
        bpos0 = nd->nd_bpos;
        bextpg0 = nd->nd_bextpg;
        bextpgsiz0 = nd->nd_bextpgsiz;

        /*
         * Fill in the first part of the reply.
         * dirlen is the reply length in bytes and cannot exceed cnt.
         * (Include the two booleans at the end of the reply in dirlen now,
         *  so we recognize when we have exceeded cnt.)
         */
        if (nd->nd_flag & ND_NFSV3) {
                dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
                nfsrv_postopattr(nd, getret, &at);
        } else {
                dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
        }
        NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
        txdr_hyper(at.na_filerev, tl);

        /*
         * Save this position, in case there is an empty reply needed.
         */
        mb1 = nd->nd_mb;
        bpos1 = nd->nd_bpos;
        bextpg1 = nd->nd_bextpg;
        bextpgsiz1 = nd->nd_bextpgsiz;

        /* Loop through the records and build reply */
        entrycnt = 0;
        while (cpos < cend && ncookies > 0 && dirlen < cnt) {
                nlen = dp->d_namlen;
                if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
                    nlen <= NFS_MAXNAMLEN &&
                    ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
                     (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
                      || (nlen == 1 && dp->d_name[0] != '.'))) {
                        /*
                         * Save the current position in the reply, in case
                         * this entry exceeds cnt.
                         */
                        mb1 = nd->nd_mb;
                        bpos1 = nd->nd_bpos;
                        bextpg1 = nd->nd_bextpg;
                        bextpgsiz1 = nd->nd_bextpgsiz;

                        /*
                         * For readdir_and_lookup get the vnode using
                         * the file number.
                         */
                        nvp = NULL;
                        refp = NULL;
                        r = 0;
                        at_root = 0;
                        needs_unbusy = 0;
                        new_mp = mp;
                        mounted_on_fileno = (uint64_t)dp->d_fileno;
                        if ((nd->nd_flag & ND_NFSV3) ||
                            NFSNONZERO_ATTRBIT(&savbits)) {
                                if (nd->nd_flag & ND_NFSV4)
                                        refp = nfsv4root_getreferral(NULL,
                                            vp, dp->d_fileno);
                                if (refp == NULL) {
                                        if (usevget)
                                                r = VFS_VGET(mp, dp->d_fileno,
                                                    LK_SHARED, &nvp);
                                        else
                                                r = EOPNOTSUPP;
                                        if (r == EOPNOTSUPP) {
                                                if (usevget) {
                                                        usevget = 0;
                                                        cn.cn_nameiop = LOOKUP;
                                                        cn.cn_lkflags =
                                                            LK_SHARED |
                                                            LK_RETRY;
                                                        cn.cn_cred =
                                                            nd->nd_cred;
                                                        cn.cn_thread = p;
                                                }
                                                cn.cn_nameptr = dp->d_name;
                                                cn.cn_namelen = nlen;
                                                cn.cn_flags = ISLASTCN |
                                                    NOFOLLOW | LOCKLEAF;
                                                if (nlen == 2 &&
                                                    dp->d_name[0] == '.' &&
                                                    dp->d_name[1] == '.')
                                                        cn.cn_flags |=
                                                            ISDOTDOT;
                                                if (NFSVOPLOCK(vp, LK_SHARED)
                                                    != 0) {
                                                        nd->nd_repstat = EPERM;
                                                        break;
                                                }
                                                if ((vp->v_vflag & VV_ROOT) != 0
                                                    && (cn.cn_flags & ISDOTDOT)
                                                    != 0) {
                                                        vref(vp);
                                                        nvp = vp;
                                                        r = 0;
                                                } else {
                                                        r = VOP_LOOKUP(vp, &nvp,
                                                            &cn);
                                                        if (vp != nvp)
                                                                NFSVOPUNLOCK(vp);
                                                }
                                        }

                                        /*
                                         * For NFSv4, check to see if nvp is
                                         * a mount point and get the mount
                                         * point vnode, as required.
                                         */
                                        if (r == 0 &&
                                            nfsrv_enable_crossmntpt != 0 &&
                                            (nd->nd_flag & ND_NFSV4) != 0 &&
                                            nvp->v_type == VDIR &&
                                            nvp->v_mountedhere != NULL) {
                                                new_mp = nvp->v_mountedhere;
                                                r = vfs_busy(new_mp, 0);
                                                vput(nvp);
                                                nvp = NULL;
                                                if (r == 0) {
                                                        r = VFS_ROOT(new_mp,
                                                            LK_SHARED, &nvp);
                                                        needs_unbusy = 1;
                                                        if (r == 0)
                                                                at_root = 1;
                                                }
                                        }
                                }

                                /*
                                 * If we failed to look up the entry, then it
                                 * has become invalid, most likely removed.
                                 */
                                if (r != 0) {
                                        if (needs_unbusy)
                                                vfs_unbusy(new_mp);
                                        goto invalid;
                                }
                                KASSERT(refp != NULL || nvp != NULL,
                                    ("%s: undetected lookup error", __func__));

                                if (refp == NULL &&
                                    ((nd->nd_flag & ND_NFSV3) ||
                                     NFSNONZERO_ATTRBIT(&attrbits))) {
                                        r = nfsvno_getfh(nvp, &nfh, p);
                                        if (!r)
                                            r = nfsvno_getattr(nvp, nvap, nd, p,
                                                1, &attrbits);
                                        if (r == 0 && is_zfs == 1 &&
                                            nfsrv_enable_crossmntpt != 0 &&
                                            (nd->nd_flag & ND_NFSV4) != 0 &&
                                            nvp->v_type == VDIR &&
                                            vp->v_mount != nvp->v_mount) {
                                            /*
                                             * For a ZFS snapshot, there is a
                                             * pseudo mount that does not set
                                             * v_mountedhere, so it needs to
                                             * be detected via a different
                                             * mount structure.
                                             */
                                            at_root = 1;
                                            if (new_mp == mp)
                                                new_mp = nvp->v_mount;
                                        }
                                }

                                /*
                                 * If we failed to get attributes of the entry,
                                 * then just skip it for NFSv3 (the traditional
                                 * behavior in the old NFS server).
                                 * For NFSv4 the behavior is controlled by
                                 * RDATTRERROR: we either ignore the error or
                                 * fail the request.
                                 * Note that RDATTRERROR is never set for NFSv3.
                                 */
                                if (r != 0) {
                                        if (!NFSISSET_ATTRBIT(&attrbits,
                                            NFSATTRBIT_RDATTRERROR)) {
                                                vput(nvp);
                                                if (needs_unbusy != 0)
                                                        vfs_unbusy(new_mp);
                                                if ((nd->nd_flag & ND_NFSV3))
                                                        goto invalid;
                                                nd->nd_repstat = r;
                                                break;
                                        }
                                }
                        }

                        /*
                         * Build the directory record xdr
                         */
                        if (nd->nd_flag & ND_NFSV3) {
                                NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
                                *tl++ = newnfs_true;
                                *tl++ = 0;
                                *tl = txdr_unsigned(dp->d_fileno);
                                dirlen += nfsm_strtom(nd, dp->d_name, nlen);
                                NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                                *tl++ = 0;
                                *tl = txdr_unsigned(*cookiep);
                                nfsrv_postopattr(nd, 0, nvap);
                                dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
                                dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
                                if (nvp != NULL)
                                        vput(nvp);
                        } else {
                                NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
                                *tl++ = newnfs_true;
                                *tl++ = 0;
                                *tl = txdr_unsigned(*cookiep);
                                dirlen += nfsm_strtom(nd, dp->d_name, nlen);
                                if (nvp != NULL) {
                                        supports_nfsv4acls =
                                            nfs_supportsnfsv4acls(nvp);
                                        NFSVOPUNLOCK(nvp);
                                } else
                                        supports_nfsv4acls = 0;
                                if (refp != NULL) {
                                        dirlen += nfsrv_putreferralattr(nd,
                                            &savbits, refp, 0,
                                            &nd->nd_repstat);
                                        if (nd->nd_repstat) {
                                                if (nvp != NULL)
                                                        vrele(nvp);
                                                if (needs_unbusy != 0)
                                                        vfs_unbusy(new_mp);
                                                break;
                                        }
                                } else if (r) {
                                        dirlen += nfsvno_fillattr(nd, new_mp,
                                            nvp, nvap, &nfh, r, &rderrbits,
                                            nd->nd_cred, p, isdgram, 0,
                                            supports_nfsv4acls, at_root,
                                            mounted_on_fileno);
                                } else {
                                        dirlen += nfsvno_fillattr(nd, new_mp,
                                            nvp, nvap, &nfh, r, &attrbits,
                                            nd->nd_cred, p, isdgram, 0,
                                            supports_nfsv4acls, at_root,
                                            mounted_on_fileno);
                                }
                                if (nvp != NULL)
                                        vrele(nvp);
                                dirlen += (3 * NFSX_UNSIGNED);
                        }
                        if (needs_unbusy != 0)
                                vfs_unbusy(new_mp);
                        if (dirlen <= cnt)
                                entrycnt++;
                }
invalid:
                cpos += dp->d_reclen;
                dp = (struct dirent *)cpos;
                cookiep++;
                ncookies--;
        }
        vrele(vp);
        vfs_unbusy(mp);

        /*
         * If dirlen > cnt, we must strip off the last entry. If that
         * results in an empty reply, report NFSERR_TOOSMALL.
         */
        if (dirlen > cnt || nd->nd_repstat) {
                if (!nd->nd_repstat && entrycnt == 0)
                        nd->nd_repstat = NFSERR_TOOSMALL;
                if (nd->nd_repstat) {
                        nfsm_trimtrailing(nd, mb0, bpos0, bextpg0, bextpgsiz0);
                        if (nd->nd_flag & ND_NFSV3)
                                nfsrv_postopattr(nd, getret, &at);
                } else
                        nfsm_trimtrailing(nd, mb1, bpos1, bextpg1, bextpgsiz1);
                eofflag = 0;
        } else if (cpos < cend)
                eofflag = 0;
        if (!nd->nd_repstat) {
                NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                *tl++ = newnfs_false;
                if (eofflag)
                        *tl = newnfs_true;
                else
                        *tl = newnfs_false;
        }
        free(cookies, M_TEMP);
        free(rbuf, M_TEMP);

out:
        NFSEXITCODE2(0, nd);
        return (0);
nfsmout:
        vput(vp);
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Get the settable attributes out of the mbuf list.
 * (Return 0 or EBADRPC)
 */
int
nfsrv_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
    nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
{
        u_int32_t *tl;
        struct nfsv2_sattr *sp;
        int error = 0, toclient = 0;

        switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
        case ND_NFSV2:
                NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
                /*
                 * Some old clients didn't fill in the high order 16bits.
                 * --> check the low order 2 bytes for 0xffff
                 */
                if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
                        nvap->na_mode = nfstov_mode(sp->sa_mode);
                if (sp->sa_uid != newnfs_xdrneg1)
                        nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
                if (sp->sa_gid != newnfs_xdrneg1)
                        nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
                if (sp->sa_size != newnfs_xdrneg1)
                        nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
                if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
#ifdef notyet
                        fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
#else
                        nvap->na_atime.tv_sec =
                                fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
                        nvap->na_atime.tv_nsec = 0;
#endif
                }
                if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
                        fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
                break;
        case ND_NFSV3:
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                if (*tl == newnfs_true) {
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        nvap->na_mode = nfstov_mode(*tl);
                }
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                if (*tl == newnfs_true) {
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        nvap->na_uid = fxdr_unsigned(uid_t, *tl);
                }
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                if (*tl == newnfs_true) {
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        nvap->na_gid = fxdr_unsigned(gid_t, *tl);
                }
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                if (*tl == newnfs_true) {
                        NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                        nvap->na_size = fxdr_hyper(tl);
                }
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                switch (fxdr_unsigned(int, *tl)) {
                case NFSV3SATTRTIME_TOCLIENT:
                        NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                        fxdr_nfsv3time(tl, &nvap->na_atime);
                        toclient = 1;
                        break;
                case NFSV3SATTRTIME_TOSERVER:
                        vfs_timestamp(&nvap->na_atime);
                        nvap->na_vaflags |= VA_UTIMES_NULL;
                        break;
                }
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                switch (fxdr_unsigned(int, *tl)) {
                case NFSV3SATTRTIME_TOCLIENT:
                        NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                        fxdr_nfsv3time(tl, &nvap->na_mtime);
                        nvap->na_vaflags &= ~VA_UTIMES_NULL;
                        break;
                case NFSV3SATTRTIME_TOSERVER:
                        vfs_timestamp(&nvap->na_mtime);
                        if (!toclient)
                                nvap->na_vaflags |= VA_UTIMES_NULL;
                        break;
                }
                break;
        case ND_NFSV4:
                error = nfsv4_sattr(nd, vp, nvap, attrbitp, aclp, p);
        }
nfsmout:
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Handle the setable attributes for V4.
 * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
 */
int
nfsv4_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
    nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
{
        u_int32_t *tl;
        int attrsum = 0;
        int i, j;
        int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
        int moderet, toclient = 0;
        u_char *cp, namestr[NFSV4_SMALLSTR + 1];
        uid_t uid;
        gid_t gid;
        u_short mode, mask;             /* Same type as va_mode. */
        struct vattr va;

        error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
        if (error)
                goto nfsmout;
        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
        attrsize = fxdr_unsigned(int, *tl);

        /*
         * Loop around getting the setable attributes. If an unsupported
         * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
         */
        if (retnotsup) {
                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                bitpos = NFSATTRBIT_MAX;
        } else {
                bitpos = 0;
        }
        moderet = 0;
        for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
            if (attrsum > attrsize) {
                error = NFSERR_BADXDR;
                goto nfsmout;
            }
            if (NFSISSET_ATTRBIT(attrbitp, bitpos))
                switch (bitpos) {
                case NFSATTRBIT_SIZE:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
                     if (vp != NULL && vp->v_type != VREG) {
                            error = (vp->v_type == VDIR) ? NFSERR_ISDIR :
                                NFSERR_INVAL;
                            goto nfsmout;
                        }
                        nvap->na_size = fxdr_hyper(tl);
                        attrsum += NFSX_HYPER;
                        break;
                case NFSATTRBIT_ACL:
                        error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
                            p);
                        if (error)
                                goto nfsmout;
                        if (aceerr && !nd->nd_repstat)
                                nd->nd_repstat = aceerr;
                        attrsum += aclsize;
                        break;
                case NFSATTRBIT_ARCHIVE:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        if (!nd->nd_repstat)
                                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        attrsum += NFSX_UNSIGNED;
                        break;
                case NFSATTRBIT_HIDDEN:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        if (!nd->nd_repstat)
                                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        attrsum += NFSX_UNSIGNED;
                        break;
                case NFSATTRBIT_MIMETYPE:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        i = fxdr_unsigned(int, *tl);
                        error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
                        if (error)
                                goto nfsmout;
                        if (!nd->nd_repstat)
                                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
                        break;
                case NFSATTRBIT_MODE:
                        moderet = NFSERR_INVAL; /* Can't do MODESETMASKED. */
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        nvap->na_mode = nfstov_mode(*tl);
                        attrsum += NFSX_UNSIGNED;
                        break;
                case NFSATTRBIT_OWNER:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        j = fxdr_unsigned(int, *tl);
                        if (j < 0) {
                                error = NFSERR_BADXDR;
                                goto nfsmout;
                        }
                        if (j > NFSV4_SMALLSTR)
                                cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
                        else
                                cp = namestr;
                        error = nfsrv_mtostr(nd, cp, j);
                        if (error) {
                                if (j > NFSV4_SMALLSTR)
                                        free(cp, M_NFSSTRING);
                                goto nfsmout;
                        }
                        if (!nd->nd_repstat) {
                                nd->nd_repstat = nfsv4_strtouid(nd, cp, j,
                                    &uid);
                                if (!nd->nd_repstat)
                                        nvap->na_uid = uid;
                        }
                        if (j > NFSV4_SMALLSTR)
                                free(cp, M_NFSSTRING);
                        attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
                        break;
                case NFSATTRBIT_OWNERGROUP:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        j = fxdr_unsigned(int, *tl);
                        if (j < 0) {
                                error = NFSERR_BADXDR;
                                goto nfsmout;
                        }
                        if (j > NFSV4_SMALLSTR)
                                cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
                        else
                                cp = namestr;
                        error = nfsrv_mtostr(nd, cp, j);
                        if (error) {
                                if (j > NFSV4_SMALLSTR)
                                        free(cp, M_NFSSTRING);
                                goto nfsmout;
                        }
                        if (!nd->nd_repstat) {
                                nd->nd_repstat = nfsv4_strtogid(nd, cp, j,
                                    &gid);
                                if (!nd->nd_repstat)
                                        nvap->na_gid = gid;
                        }
                        if (j > NFSV4_SMALLSTR)
                                free(cp, M_NFSSTRING);
                        attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
                        break;
                case NFSATTRBIT_SYSTEM:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        if (!nd->nd_repstat)
                                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        attrsum += NFSX_UNSIGNED;
                        break;
                case NFSATTRBIT_TIMEACCESSSET:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        attrsum += NFSX_UNSIGNED;
                        if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
                            NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
                            fxdr_nfsv4time(tl, &nvap->na_atime);
                            toclient = 1;
                            attrsum += NFSX_V4TIME;
                        } else {
                            vfs_timestamp(&nvap->na_atime);
                            nvap->na_vaflags |= VA_UTIMES_NULL;
                        }
                        break;
                case NFSATTRBIT_TIMEBACKUP:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
                        if (!nd->nd_repstat)
                                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        attrsum += NFSX_V4TIME;
                        break;
                case NFSATTRBIT_TIMECREATE:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
                        fxdr_nfsv4time(tl, &nvap->na_btime);
                        attrsum += NFSX_V4TIME;
                        break;
                case NFSATTRBIT_TIMEMODIFYSET:
                        NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                        attrsum += NFSX_UNSIGNED;
                        if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
                            NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
                            fxdr_nfsv4time(tl, &nvap->na_mtime);
                            nvap->na_vaflags &= ~VA_UTIMES_NULL;
                            attrsum += NFSX_V4TIME;
                        } else {
                            vfs_timestamp(&nvap->na_mtime);
                            if (!toclient)
                                nvap->na_vaflags |= VA_UTIMES_NULL;
                        }
                        break;
                case NFSATTRBIT_MODESETMASKED:
                        NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
                        mode = fxdr_unsigned(u_short, *tl++);
                        mask = fxdr_unsigned(u_short, *tl);
                        /*
                         * vp == NULL implies an Open/Create operation.
                         * This attribute can only be used for Setattr and
                         * only for NFSv4.1 or higher.
                         * If moderet != 0, a mode attribute has also been
                         * specified and this attribute cannot be done in the
                         * same Setattr operation.
                         */
                        if ((nd->nd_flag & ND_NFSV41) == 0)
                                nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        else if ((mode & ~07777) != 0 || (mask & ~07777) != 0 ||
                            vp == NULL)
                                nd->nd_repstat = NFSERR_INVAL;
                        else if (moderet == 0)
                                moderet = VOP_GETATTR(vp, &va, nd->nd_cred);
                        if (moderet == 0)
                                nvap->na_mode = (mode & mask) |
                                    (va.va_mode & ~mask);
                        else
                                nd->nd_repstat = moderet;
                        attrsum += 2 * NFSX_UNSIGNED;
                        break;
                default:
                        nd->nd_repstat = NFSERR_ATTRNOTSUPP;
                        /*
                         * set bitpos so we drop out of the loop.
                         */
                        bitpos = NFSATTRBIT_MAX;
                        break;
                }
        }

        /*
         * some clients pad the attrlist, so we need to skip over the
         * padding.
         */
        if (attrsum > attrsize) {
                error = NFSERR_BADXDR;
        } else {
                attrsize = NFSM_RNDUP(attrsize);
                if (attrsum < attrsize)
                        error = nfsm_advance(nd, attrsize - attrsum, -1);
        }
nfsmout:
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Check/setup export credentials.
 */
int
nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
    struct ucred *credanon, bool testsec)
{
        int error;

        /*
         * Check/setup credentials.
         */
        if (nd->nd_flag & ND_GSS)
                exp->nes_exflag &= ~MNT_EXPORTANON;

        /*
         * Check to see if the operation is allowed for this security flavor.
         */
        error = 0;
        if (testsec) {
                error = nfsvno_testexp(nd, exp);
                if (error != 0)
                        goto out;
        }

        /*
         * Check to see if the file system is exported V4 only.
         */
        if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
                error = NFSERR_PROGNOTV4;
                goto out;
        }

        /*
         * Now, map the user credentials.
         * (Note that ND_AUTHNONE will only be set for an NFSv3
         *  Fsinfo RPC. If set for anything else, this code might need
         *  to change.)
         */
        if (NFSVNO_EXPORTED(exp)) {
                if (((nd->nd_flag & ND_GSS) == 0 && nd->nd_cred->cr_uid == 0) ||
                     NFSVNO_EXPORTANON(exp) ||
                     (nd->nd_flag & ND_AUTHNONE) != 0) {
                        nd->nd_cred->cr_uid = credanon->cr_uid;
                        nd->nd_cred->cr_gid = credanon->cr_gid;
                        crsetgroups(nd->nd_cred, credanon->cr_ngroups,
                            credanon->cr_groups);
                } else if ((nd->nd_flag & ND_GSS) == 0) {
                        /*
                         * If using AUTH_SYS, call nfsrv_getgrpscred() to see
                         * if there is a replacement credential with a group
                         * list set up by "nfsuserd -manage-gids".
                         * If there is no replacement, nfsrv_getgrpscred()
                         * simply returns its argument.
                         */
                        nd->nd_cred = nfsrv_getgrpscred(nd->nd_cred);
                }
        }

out:
        NFSEXITCODE2(error, nd);
        return (error);
}

/*
 * Check exports.
 */
int
nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
    struct ucred **credp)
{
        int error;

        error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
            &exp->nes_numsecflavor, exp->nes_secflavors);
        if (error) {
                if (nfs_rootfhset) {
                        exp->nes_exflag = 0;
                        exp->nes_numsecflavor = 0;
                        error = 0;
                }
        } else if (exp->nes_numsecflavor < 1 || exp->nes_numsecflavor >
            MAXSECFLAVORS) {
                printf("nfsvno_checkexp: numsecflavors out of range\n");
                exp->nes_numsecflavor = 0;
                error = EACCES;
        }
        NFSEXITCODE(error);
        return (error);
}

/*
 * Get a vnode for a file handle and export stuff.
 */
int
nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
    int lktype, struct vnode **vpp, struct nfsexstuff *exp,
    struct ucred **credp)
{
        int error;

        *credp = NULL;
        exp->nes_numsecflavor = 0;
        error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
        if (error != 0)
                /* Make sure the server replies ESTALE to the client. */
                error = ESTALE;
        if (nam && !error) {
                error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
                    &exp->nes_numsecflavor, exp->nes_secflavors);
                if (error) {
                        if (nfs_rootfhset) {
                                exp->nes_exflag = 0;
                                exp->nes_numsecflavor = 0;
                                error = 0;
                        } else {
                                vput(*vpp);
                        }
                } else if (exp->nes_numsecflavor < 1 || exp->nes_numsecflavor >
                    MAXSECFLAVORS) {
                        printf("nfsvno_fhtovp: numsecflavors out of range\n");
                        exp->nes_numsecflavor = 0;
                        error = EACCES;
                        vput(*vpp);
                }
        }
        NFSEXITCODE(error);
        return (error);
}

/*
 * nfsd_fhtovp() - convert a fh to a vnode ptr
 *      - look up fsid in mount list (if not found ret error)
 *      - get vp and export rights by calling nfsvno_fhtovp()
 *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
 *        for AUTH_SYS
 *      - if mpp != NULL, return the mount point so that it can
 *        be used for vn_finished_write() by the caller
 */
void
nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
    struct vnode **vpp, struct nfsexstuff *exp,
    struct mount **mpp, int startwrite, int nextop)
{
        struct mount *mp, *mpw;
        struct ucred *credanon;
        fhandle_t *fhp;
        int error;

        if (mpp != NULL)
                *mpp = NULL;
        *vpp = NULL;
        fhp = (fhandle_t *)nfp->nfsrvfh_data;
        mp = vfs_busyfs(&fhp->fh_fsid);
        if (mp == NULL) {
                nd->nd_repstat = ESTALE;
                goto out;
        }

        if (startwrite) {
                mpw = mp;
                error = vn_start_write(NULL, &mpw, V_WAIT);
                if (error != 0) {
                        mpw = NULL;
                        vfs_unbusy(mp);
                        nd->nd_repstat = ESTALE;
                        goto out;
                }
                if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
                        lktype = LK_EXCLUSIVE;
        } else
                mpw = NULL;

        nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
            &credanon);
        vfs_unbusy(mp);

        /*
         * For NFSv4 without a pseudo root fs, unexported file handles
         * can be returned, so that Lookup works everywhere.
         */
        if (!nd->nd_repstat && exp->nes_exflag == 0 &&
            !(nd->nd_flag & ND_NFSV4)) {
                vput(*vpp);
                *vpp = NULL;
                nd->nd_repstat = EACCES;
        }

        /*
         * Personally, I've never seen any point in requiring a
         * reserved port#, since only in the rare case where the
         * clients are all boxes with secure system privileges,
         * does it provide any enhanced security, but... some people
         * believe it to be useful and keep putting this code back in.
         * (There is also some "security checker" out there that
         *  complains if the nfs server doesn't enforce this.)
         * However, note the following:
         * RFC3530 (NFSv4) specifies that a reserved port# not be
         *      required.
         * RFC2623 recommends that, if a reserved port# is checked for,
         *      that there be a way to turn that off--> ifdef'd.
         */
#ifdef NFS_REQRSVPORT
        if (!nd->nd_repstat) {
                struct sockaddr_in *saddr;
                struct sockaddr_in6 *saddr6;

                saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
                saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
                if (!(nd->nd_flag & ND_NFSV4) &&
                    ((saddr->sin_family == AF_INET &&
                      ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
                     (saddr6->sin6_family == AF_INET6 &&
                      ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
                        vput(*vpp);
                        nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
                }
        }
#endif  /* NFS_REQRSVPORT */

        /*
         * Check/setup credentials.
         */
        if (!nd->nd_repstat) {
                nd->nd_saveduid = nd->nd_cred->cr_uid;
                nd->nd_repstat = nfsd_excred(nd, exp, credanon,
                    nfsrv_checkwrongsec(nd, nextop, (*vpp)->v_type));
                if (nd->nd_repstat)
                        vput(*vpp);
        }
        if (credanon != NULL)
                crfree(credanon);
        if (nd->nd_repstat) {
                vn_finished_write(mpw);
                *vpp = NULL;
        } else if (mpp != NULL) {
                *mpp = mpw;
        }

out:
        NFSEXITCODE2(0, nd);
}

/*
 * glue for fp.
 */
static int
fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
{
        struct filedesc *fdp;
        struct file *fp;
        int error = 0;

        fdp = p->td_proc->p_fd;
        if (fd < 0 || fd >= fdp->fd_nfiles ||
            (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
                error = EBADF;
                goto out;
        }
        *fpp = fp;

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Called from nfssvc() to update the exports list. Just call
 * vfs_export(). This has to be done, since the v4 root fake fs isn't
 * in the mount list.
 */
int
nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
{
        struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
        int error = 0;
        struct nameidata nd;
        fhandle_t fh;

        error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
        if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
                nfs_rootfhset = 0;
        else if (error == 0) {
                if (nfsexargp->fspec == NULL) {
                        error = EPERM;
                        goto out;
                }
                /*
                 * If fspec != NULL, this is the v4root path.
                 */
                NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
                    nfsexargp->fspec, p);
                if ((error = namei(&nd)) != 0)
                        goto out;
                error = nfsvno_getfh(nd.ni_vp, &fh, p);
                vrele(nd.ni_vp);
                if (!error) {
                        nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
                        NFSBCOPY((caddr_t)&fh,
                            nfs_rootfh.nfsrvfh_data,
                            sizeof (fhandle_t));
                        nfs_rootfhset = 1;
                }
        }

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * This function needs to test to see if the system is near its limit
 * for memory allocation via malloc() or mget() and return True iff
 * either of these resources are near their limit.
 * XXX (For now, this is just a stub.)
 */
int nfsrv_testmalloclimit = 0;
int
nfsrv_mallocmget_limit(void)
{
        static int printmesg = 0;
        static int testval = 1;

        if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
                if ((printmesg++ % 100) == 0)
                        printf("nfsd: malloc/mget near limit\n");
                return (1);
        }
        return (0);
}

/*
 * BSD specific initialization of a mount point.
 */
void
nfsd_mntinit(void)
{
        static int inited = 0;

        if (inited)
                return;
        inited = 1;
        nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
        TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
        TAILQ_INIT(&nfsv4root_mnt.mnt_lazyvnodelist);
        nfsv4root_mnt.mnt_export = NULL;
        TAILQ_INIT(&nfsv4root_opt);
        TAILQ_INIT(&nfsv4root_newopt);
        nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
        nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
        nfsv4root_mnt.mnt_nvnodelistsize = 0;
        nfsv4root_mnt.mnt_lazyvnodelistsize = 0;
}

/*
 * Get a vnode for a file handle, without checking exports, etc.
 */
struct vnode *
nfsvno_getvp(fhandle_t *fhp)
{
        struct mount *mp;
        struct vnode *vp;
        int error;

        mp = vfs_busyfs(&fhp->fh_fsid);
        if (mp == NULL)
                return (NULL);
        error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
        vfs_unbusy(mp);
        if (error)
                return (NULL);
        return (vp);
}

/*
 * Do a local VOP_ADVLOCK().
 */
int
nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
    u_int64_t end, struct thread *td)
{
        int error = 0;
        struct flock fl;
        u_int64_t tlen;

        if (nfsrv_dolocallocks == 0)
                goto out;
        ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");

        fl.l_whence = SEEK_SET;
        fl.l_type = ftype;
        fl.l_start = (off_t)first;
        if (end == NFS64BITSSET) {
                fl.l_len = 0;
        } else {
                tlen = end - first;
                fl.l_len = (off_t)tlen;
        }
        /*
         * For FreeBSD8, the l_pid and l_sysid must be set to the same
         * values for all calls, so that all locks will be held by the
         * nfsd server. (The nfsd server handles conflicts between the
         * various clients.)
         * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
         * bytes, so it can't be put in l_sysid.
         */
        if (nfsv4_sysid == 0)
                nfsv4_sysid = nlm_acquire_next_sysid();
        fl.l_pid = (pid_t)0;
        fl.l_sysid = (int)nfsv4_sysid;

        if (ftype == F_UNLCK)
                error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
                    (F_POSIX | F_REMOTE));
        else
                error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
                    (F_POSIX | F_REMOTE));

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Check the nfsv4 root exports.
 */
int
nfsvno_v4rootexport(struct nfsrv_descript *nd)
{
        struct ucred *credanon;
        int error = 0, numsecflavor, secflavors[MAXSECFLAVORS], i;
        uint64_t exflags;

        error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
            &credanon, &numsecflavor, secflavors);
        if (error) {
                error = NFSERR_PROGUNAVAIL;
                goto out;
        }
        if (credanon != NULL)
                crfree(credanon);
        for (i = 0; i < numsecflavor; i++) {
                if (secflavors[i] == AUTH_SYS)
                        nd->nd_flag |= ND_EXAUTHSYS;
                else if (secflavors[i] == RPCSEC_GSS_KRB5)
                        nd->nd_flag |= ND_EXGSS;
                else if (secflavors[i] == RPCSEC_GSS_KRB5I)
                        nd->nd_flag |= ND_EXGSSINTEGRITY;
                else if (secflavors[i] == RPCSEC_GSS_KRB5P)
                        nd->nd_flag |= ND_EXGSSPRIVACY;
        }

        /* And set ND_EXxx flags for TLS. */
        if ((exflags & MNT_EXTLS) != 0) {
                nd->nd_flag |= ND_EXTLS;
                if ((exflags & MNT_EXTLSCERT) != 0)
                        nd->nd_flag |= ND_EXTLSCERT;
                if ((exflags & MNT_EXTLSCERTUSER) != 0)
                        nd->nd_flag |= ND_EXTLSCERTUSER;
        }

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Nfs server pseudo system call for the nfsd's
 */
/*
 * MPSAFE
 */
static int
nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
{
        struct file *fp;
        struct nfsd_addsock_args sockarg;
        struct nfsd_nfsd_args nfsdarg;
        struct nfsd_nfsd_oargs onfsdarg;
        struct nfsd_pnfsd_args pnfsdarg;
        struct vnode *vp, *nvp, *curdvp;
        struct pnfsdsfile *pf;
        struct nfsdevice *ds, *fds;
        cap_rights_t rights;
        int buflen, error, ret;
        char *buf, *cp, *cp2, *cp3;
        char fname[PNFS_FILENAME_LEN + 1];

        if (uap->flag & NFSSVC_NFSDADDSOCK) {
                error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
                if (error)
                        goto out;
                /*
                 * Since we don't know what rights might be required,
                 * pretend that we need them all. It is better to be too
                 * careful than too reckless.
                 */
                error = fget(td, sockarg.sock,
                    cap_rights_init_one(&rights, CAP_SOCK_SERVER), &fp);
                if (error != 0)
                        goto out;
                if (fp->f_type != DTYPE_SOCKET) {
                        fdrop(fp, td);
                        error = EPERM;
                        goto out;
                }
                error = nfsrvd_addsock(fp);
                fdrop(fp, td);
        } else if (uap->flag & NFSSVC_NFSDNFSD) {
                if (uap->argp == NULL) {
                        error = EINVAL;
                        goto out;
                }
                if ((uap->flag & NFSSVC_NEWSTRUCT) == 0) {
                        error = copyin(uap->argp, &onfsdarg, sizeof(onfsdarg));
                        if (error == 0) {
                                nfsdarg.principal = onfsdarg.principal;
                                nfsdarg.minthreads = onfsdarg.minthreads;
                                nfsdarg.maxthreads = onfsdarg.maxthreads;
                                nfsdarg.version = 1;
                                nfsdarg.addr = NULL;
                                nfsdarg.addrlen = 0;
                                nfsdarg.dnshost = NULL;
                                nfsdarg.dnshostlen = 0;
                                nfsdarg.dspath = NULL;
                                nfsdarg.dspathlen = 0;
                                nfsdarg.mdspath = NULL;
                                nfsdarg.mdspathlen = 0;
                                nfsdarg.mirrorcnt = 1;
                        }
                } else
                        error = copyin(uap->argp, &nfsdarg, sizeof(nfsdarg));
                if (error)
                        goto out;
                if (nfsdarg.addrlen > 0 && nfsdarg.addrlen < 10000 &&
                    nfsdarg.dnshostlen > 0 && nfsdarg.dnshostlen < 10000 &&
                    nfsdarg.dspathlen > 0 && nfsdarg.dspathlen < 10000 &&
                    nfsdarg.mdspathlen > 0 && nfsdarg.mdspathlen < 10000 &&
                    nfsdarg.mirrorcnt >= 1 &&
                    nfsdarg.mirrorcnt <= NFSDEV_MAXMIRRORS &&
                    nfsdarg.addr != NULL && nfsdarg.dnshost != NULL &&
                    nfsdarg.dspath != NULL && nfsdarg.mdspath != NULL) {
                        NFSD_DEBUG(1, "addrlen=%d dspathlen=%d dnslen=%d"
                            " mdspathlen=%d mirrorcnt=%d\n", nfsdarg.addrlen,
                            nfsdarg.dspathlen, nfsdarg.dnshostlen,
                            nfsdarg.mdspathlen, nfsdarg.mirrorcnt);
                        cp = malloc(nfsdarg.addrlen + 1, M_TEMP, M_WAITOK);
                        error = copyin(nfsdarg.addr, cp, nfsdarg.addrlen);
                        if (error != 0) {
                                free(cp, M_TEMP);
                                goto out;
                        }
                        cp[nfsdarg.addrlen] = '\0';     /* Ensure nul term. */
                        nfsdarg.addr = cp;
                        cp = malloc(nfsdarg.dnshostlen + 1, M_TEMP, M_WAITOK);
                        error = copyin(nfsdarg.dnshost, cp, nfsdarg.dnshostlen);
                        if (error != 0) {
                                free(nfsdarg.addr, M_TEMP);
                                free(cp, M_TEMP);
                                goto out;
                        }
                        cp[nfsdarg.dnshostlen] = '\0';  /* Ensure nul term. */
                        nfsdarg.dnshost = cp;
                        cp = malloc(nfsdarg.dspathlen + 1, M_TEMP, M_WAITOK);
                        error = copyin(nfsdarg.dspath, cp, nfsdarg.dspathlen);
                        if (error != 0) {
                                free(nfsdarg.addr, M_TEMP);
                                free(nfsdarg.dnshost, M_TEMP);
                                free(cp, M_TEMP);
                                goto out;
                        }
                        cp[nfsdarg.dspathlen] = '\0';   /* Ensure nul term. */
                        nfsdarg.dspath = cp;
                        cp = malloc(nfsdarg.mdspathlen + 1, M_TEMP, M_WAITOK);
                        error = copyin(nfsdarg.mdspath, cp, nfsdarg.mdspathlen);
                        if (error != 0) {
                                free(nfsdarg.addr, M_TEMP);
                                free(nfsdarg.dnshost, M_TEMP);
                                free(nfsdarg.dspath, M_TEMP);
                                free(cp, M_TEMP);
                                goto out;
                        }
                        cp[nfsdarg.mdspathlen] = '\0';  /* Ensure nul term. */
                        nfsdarg.mdspath = cp;
                } else {
                        nfsdarg.addr = NULL;
                        nfsdarg.addrlen = 0;
                        nfsdarg.dnshost = NULL;
                        nfsdarg.dnshostlen = 0;
                        nfsdarg.dspath = NULL;
                        nfsdarg.dspathlen = 0;
                        nfsdarg.mdspath = NULL;
                        nfsdarg.mdspathlen = 0;
                        nfsdarg.mirrorcnt = 1;
                }
                error = nfsrvd_nfsd(td, &nfsdarg);
                free(nfsdarg.addr, M_TEMP);
                free(nfsdarg.dnshost, M_TEMP);
                free(nfsdarg.dspath, M_TEMP);
                free(nfsdarg.mdspath, M_TEMP);
        } else if (uap->flag & NFSSVC_PNFSDS) {
                error = copyin(uap->argp, &pnfsdarg, sizeof(pnfsdarg));
                if (error == 0 && (pnfsdarg.op == PNFSDOP_DELDSSERVER ||
                    pnfsdarg.op == PNFSDOP_FORCEDELDS)) {
                        cp = malloc(PATH_MAX + 1, M_TEMP, M_WAITOK);
                        error = copyinstr(pnfsdarg.dspath, cp, PATH_MAX + 1,
                            NULL);
                        if (error == 0)
                                error = nfsrv_deldsserver(pnfsdarg.op, cp, td);
                        free(cp, M_TEMP);
                } else if (error == 0 && pnfsdarg.op == PNFSDOP_COPYMR) {
                        cp = malloc(PATH_MAX + 1, M_TEMP, M_WAITOK);
                        buflen = sizeof(*pf) * NFSDEV_MAXMIRRORS;
                        buf = malloc(buflen, M_TEMP, M_WAITOK);
                        error = copyinstr(pnfsdarg.mdspath, cp, PATH_MAX + 1,
                            NULL);
                        NFSD_DEBUG(4, "pnfsdcopymr cp mdspath=%d\n", error);
                        if (error == 0 && pnfsdarg.dspath != NULL) {
                                cp2 = malloc(PATH_MAX + 1, M_TEMP, M_WAITOK);
                                error = copyinstr(pnfsdarg.dspath, cp2,
                                    PATH_MAX + 1, NULL);
                                NFSD_DEBUG(4, "pnfsdcopymr cp dspath=%d\n",
                                    error);
                        } else
                                cp2 = NULL;
                        if (error == 0 && pnfsdarg.curdspath != NULL) {
                                cp3 = malloc(PATH_MAX + 1, M_TEMP, M_WAITOK);
                                error = copyinstr(pnfsdarg.curdspath, cp3,
                                    PATH_MAX + 1, NULL);
                                NFSD_DEBUG(4, "pnfsdcopymr cp curdspath=%d\n",
                                    error);
                        } else
                                cp3 = NULL;
                        curdvp = NULL;
                        fds = NULL;
                        if (error == 0)
                                error = nfsrv_mdscopymr(cp, cp2, cp3, buf,
                                    &buflen, fname, td, &vp, &nvp, &pf, &ds,
                                    &fds);
                        NFSD_DEBUG(4, "nfsrv_mdscopymr=%d\n", error);
                        if (error == 0) {
                                if (pf->dsf_dir >= nfsrv_dsdirsize) {
                                        printf("copymr: dsdir out of range\n");
                                        pf->dsf_dir = 0;
                                }
                                NFSD_DEBUG(4, "copymr: buflen=%d\n", buflen);
                                error = nfsrv_copymr(vp, nvp,
                                    ds->nfsdev_dsdir[pf->dsf_dir], ds, pf,
                                    (struct pnfsdsfile *)buf,
                                    buflen / sizeof(*pf), td->td_ucred, td);
                                vput(vp);
                                vput(nvp);
                                if (fds != NULL && error == 0) {
                                        curdvp = fds->nfsdev_dsdir[pf->dsf_dir];
                                        ret = vn_lock(curdvp, LK_EXCLUSIVE);
                                        if (ret == 0) {
                                                nfsrv_dsremove(curdvp, fname,
                                                    td->td_ucred, td);
                                                NFSVOPUNLOCK(curdvp);
                                        }
                                }
                                NFSD_DEBUG(4, "nfsrv_copymr=%d\n", error);
                        }
                        free(cp, M_TEMP);
                        free(cp2, M_TEMP);
                        free(cp3, M_TEMP);
                        free(buf, M_TEMP);
                }
        } else {
                error = nfssvc_srvcall(td, uap, td->td_ucred);
        }

out:
        NFSEXITCODE(error);
        return (error);
}

static int
nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
{
        struct nfsex_args export;
        struct nfsex_oldargs oexp;
        struct file *fp = NULL;
        int stablefd, i, len;
        struct nfsd_clid adminrevoke;
        struct nfsd_dumplist dumplist;
        struct nfsd_dumpclients *dumpclients;
        struct nfsd_dumplocklist dumplocklist;
        struct nfsd_dumplocks *dumplocks;
        struct nameidata nd;
        vnode_t vp;
        int error = EINVAL, igotlock;
        struct proc *procp;
        gid_t *grps;
        static int suspend_nfsd = 0;

        if (uap->flag & NFSSVC_PUBLICFH) {
                NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
                    sizeof (fhandle_t));
                error = copyin(uap->argp,
                    &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
                if (!error)
                        nfs_pubfhset = 1;
        } else if ((uap->flag & (NFSSVC_V4ROOTEXPORT | NFSSVC_NEWSTRUCT)) ==
            (NFSSVC_V4ROOTEXPORT | NFSSVC_NEWSTRUCT)) {
                error = copyin(uap->argp,(caddr_t)&export,
                    sizeof (struct nfsex_args));
                if (!error) {
                        grps = NULL;
                        if (export.export.ex_ngroups > NGROUPS_MAX ||
                            export.export.ex_ngroups < 0)
                                error = EINVAL;
                        else if (export.export.ex_ngroups > 0) {
                                grps = malloc(export.export.ex_ngroups *
                                    sizeof(gid_t), M_TEMP, M_WAITOK);
                                error = copyin(export.export.ex_groups, grps,
                                    export.export.ex_ngroups * sizeof(gid_t));
                                export.export.ex_groups = grps;
                        } else
                                export.export.ex_groups = NULL;
                        if (!error)
                                error = nfsrv_v4rootexport(&export, cred, p);
                        free(grps, M_TEMP);
                }
        } else if ((uap->flag & (NFSSVC_V4ROOTEXPORT | NFSSVC_NEWSTRUCT)) ==
            NFSSVC_V4ROOTEXPORT) {
                error = copyin(uap->argp,(caddr_t)&oexp,
                    sizeof (struct nfsex_oldargs));
                if (!error) {
                        memset(&export.export, 0, sizeof(export.export));
                        export.export.ex_flags = (uint64_t)oexp.export.ex_flags;
                        export.export.ex_root = oexp.export.ex_root;
                        export.export.ex_uid = oexp.export.ex_anon.cr_uid;
                        export.export.ex_ngroups =
                            oexp.export.ex_anon.cr_ngroups;
                        export.export.ex_groups = NULL;
                        if (export.export.ex_ngroups > XU_NGROUPS ||
                            export.export.ex_ngroups < 0)
                                error = EINVAL;
                        else if (export.export.ex_ngroups > 0) {
                                export.export.ex_groups = malloc(
                                    export.export.ex_ngroups * sizeof(gid_t),
                                    M_TEMP, M_WAITOK);
                                for (i = 0; i < export.export.ex_ngroups; i++)
                                        export.export.ex_groups[i] =
                                            oexp.export.ex_anon.cr_groups[i];
                        }
                        export.export.ex_addr = oexp.export.ex_addr;
                        export.export.ex_addrlen = oexp.export.ex_addrlen;
                        export.export.ex_mask = oexp.export.ex_mask;
                        export.export.ex_masklen = oexp.export.ex_masklen;
                        export.export.ex_indexfile = oexp.export.ex_indexfile;
                        export.export.ex_numsecflavors =
                            oexp.export.ex_numsecflavors;
                        if (export.export.ex_numsecflavors >= MAXSECFLAVORS ||
                            export.export.ex_numsecflavors < 0)
                                error = EINVAL;
                        else {
                                for (i = 0; i < export.export.ex_numsecflavors;
                                    i++)
                                        export.export.ex_secflavors[i] =
                                            oexp.export.ex_secflavors[i];
                        }
                        export.fspec = oexp.fspec;
                        if (error == 0)
                                error = nfsrv_v4rootexport(&export, cred, p);
                        free(export.export.ex_groups, M_TEMP);
                }
        } else if (uap->flag & NFSSVC_NOPUBLICFH) {
                nfs_pubfhset = 0;
                error = 0;
        } else if (uap->flag & NFSSVC_STABLERESTART) {
                error = copyin(uap->argp, (caddr_t)&stablefd,
                    sizeof (int));
                if (!error)
                        error = fp_getfvp(p, stablefd, &fp, &vp);
                if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
                        error = EBADF;
                if (!error && newnfs_numnfsd != 0)
                        error = EPERM;
                if (!error) {
                        nfsrv_stablefirst.nsf_fp = fp;
                        nfsrv_setupstable(p);
                }
        } else if (uap->flag & NFSSVC_ADMINREVOKE) {
                error = copyin(uap->argp, (caddr_t)&adminrevoke,
                    sizeof (struct nfsd_clid));
                if (!error)
                        error = nfsrv_adminrevoke(&adminrevoke, p);
        } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
                error = copyin(uap->argp, (caddr_t)&dumplist,
                    sizeof (struct nfsd_dumplist));
                if (!error && (dumplist.ndl_size < 1 ||
                        dumplist.ndl_size > NFSRV_MAXDUMPLIST))
                        error = EPERM;
                if (!error) {
                    len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
                    dumpclients = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
                    nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
                    error = copyout(dumpclients, dumplist.ndl_list, len);
                    free(dumpclients, M_TEMP);
                }
        } else if (uap->flag & NFSSVC_DUMPLOCKS) {
                error = copyin(uap->argp, (caddr_t)&dumplocklist,
                    sizeof (struct nfsd_dumplocklist));
                if (!error && (dumplocklist.ndllck_size < 1 ||
                        dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
                        error = EPERM;
                if (!error)
                        error = nfsrv_lookupfilename(&nd,
                                dumplocklist.ndllck_fname, p);
                if (!error) {
                        len = sizeof (struct nfsd_dumplocks) *
                                dumplocklist.ndllck_size;
                        dumplocks = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
                        nfsrv_dumplocks(nd.ni_vp, dumplocks,
                            dumplocklist.ndllck_size, p);
                        vput(nd.ni_vp);
                        error = copyout(dumplocks, dumplocklist.ndllck_list,
                            len);
                        free(dumplocks, M_TEMP);
                }
        } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
                procp = p->td_proc;
                PROC_LOCK(procp);
                nfsd_master_pid = procp->p_pid;
                bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
                nfsd_master_start = procp->p_stats->p_start;
                nfsd_master_proc = procp;
                PROC_UNLOCK(procp);
        } else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
                NFSLOCKV4ROOTMUTEX();
                if (suspend_nfsd == 0) {
                        /* Lock out all nfsd threads */
                        do {
                                igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
                                    NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
                        } while (igotlock == 0 && suspend_nfsd == 0);
                        suspend_nfsd = 1;
                }
                NFSUNLOCKV4ROOTMUTEX();
                error = 0;
        } else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
                NFSLOCKV4ROOTMUTEX();
                if (suspend_nfsd != 0) {
                        nfsv4_unlock(&nfsd_suspend_lock, 0);
                        suspend_nfsd = 0;
                }
                NFSUNLOCKV4ROOTMUTEX();
                error = 0;
        }

        NFSEXITCODE(error);
        return (error);
}

/*
 * Check exports.
 * Returns 0 if ok, 1 otherwise.
 */
int
nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
{
        int i;

        /*
         * Allow NFSv3 Fsinfo per RFC2623.
         */
        if (((nd->nd_flag & ND_NFSV4) != 0 ||
             nd->nd_procnum != NFSPROC_FSINFO) &&
            ((NFSVNO_EXTLS(exp) && (nd->nd_flag & ND_TLS) == 0) ||
             (NFSVNO_EXTLSCERT(exp) &&
              (nd->nd_flag & ND_TLSCERT) == 0) ||
             (NFSVNO_EXTLSCERTUSER(exp) &&
              (nd->nd_flag & ND_TLSCERTUSER) == 0))) {
                if ((nd->nd_flag & ND_NFSV4) != 0)
                        return (NFSERR_WRONGSEC);
                else if ((nd->nd_flag & ND_TLS) == 0)
                        return (NFSERR_AUTHERR | AUTH_NEEDS_TLS);
                else
                        return (NFSERR_AUTHERR | AUTH_NEEDS_TLS_MUTUAL_HOST);
        }

        /*
         * This seems odd, but allow the case where the security flavor
         * list is empty. This happens when NFSv4 is traversing non-exported
         * file systems. Exported file systems should always have a non-empty
         * security flavor list.
         */
        if (exp->nes_numsecflavor == 0)
                return (0);

        for (i = 0; i < exp->nes_numsecflavor; i++) {
                /*
                 * The tests for privacy and integrity must be first,
                 * since ND_GSS is set for everything but AUTH_SYS.
                 */
                if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
                    (nd->nd_flag & ND_GSSPRIVACY))
                        return (0);
                if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
                    (nd->nd_flag & ND_GSSINTEGRITY))
                        return (0);
                if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
                    (nd->nd_flag & ND_GSS))
                        return (0);
                if (exp->nes_secflavors[i] == AUTH_SYS &&
                    (nd->nd_flag & ND_GSS) == 0)
                        return (0);
        }
        if ((nd->nd_flag & ND_NFSV4) != 0)
                return (NFSERR_WRONGSEC);
        return (NFSERR_AUTHERR | AUTH_TOOWEAK);
}

/*
 * Calculate a hash value for the fid in a file handle.
 */
uint32_t
nfsrv_hashfh(fhandle_t *fhp)
{
        uint32_t hashval;

        hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
        return (hashval);
}

/*
 * Calculate a hash value for the sessionid.
 */
uint32_t
nfsrv_hashsessionid(uint8_t *sessionid)
{
        uint32_t hashval;

        hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
        return (hashval);
}

/*
 * Signal the userland master nfsd to backup the stable restart file.
 */
void
nfsrv_backupstable(void)
{
        struct proc *procp;

        if (nfsd_master_proc != NULL) {
                procp = pfind(nfsd_master_pid);
                /* Try to make sure it is the correct process. */
                if (procp == nfsd_master_proc &&
                    procp->p_stats->p_start.tv_sec ==
                    nfsd_master_start.tv_sec &&
                    procp->p_stats->p_start.tv_usec ==
                    nfsd_master_start.tv_usec &&
                    strcmp(procp->p_comm, nfsd_master_comm) == 0)
                        kern_psignal(procp, SIGUSR2);
                else
                        nfsd_master_proc = NULL;

                if (procp != NULL)
                        PROC_UNLOCK(procp);
        }
}

/*
 * Create a DS data file for nfsrv_pnfscreate(). Called for each mirror.
 * The arguments are in a structure, so that they can be passed through
 * taskqueue for a kernel process to execute this function.
 */
struct nfsrvdscreate {
        int                     done;
        int                     inprog;
        struct task             tsk;
        struct ucred            *tcred;
        struct vnode            *dvp;
        NFSPROC_T               *p;
        struct pnfsdsfile       *pf;
        int                     err;
        fhandle_t               fh;
        struct vattr            va;
        struct vattr            createva;
};

int
nfsrv_dscreate(struct vnode *dvp, struct vattr *vap, struct vattr *nvap,
    fhandle_t *fhp, struct pnfsdsfile *pf, struct pnfsdsattr *dsa,
    char *fnamep, struct ucred *tcred, NFSPROC_T *p, struct vnode **nvpp)
{
        struct vnode *nvp;
        struct nameidata named;
        struct vattr va;
        char *bufp;
        u_long *hashp;
        struct nfsnode *np;
        struct nfsmount *nmp;
        int error;

        NFSNAMEICNDSET(&named.ni_cnd, tcred, CREATE,
            LOCKPARENT | LOCKLEAF | SAVESTART | NOCACHE);
        nfsvno_setpathbuf(&named, &bufp, &hashp);
        named.ni_cnd.cn_lkflags = LK_EXCLUSIVE;
        named.ni_cnd.cn_thread = p;
        named.ni_cnd.cn_nameptr = bufp;
        if (fnamep != NULL) {
                strlcpy(bufp, fnamep, PNFS_FILENAME_LEN + 1);
                named.ni_cnd.cn_namelen = strlen(bufp);
        } else
                named.ni_cnd.cn_namelen = nfsrv_putfhname(fhp, bufp);
        NFSD_DEBUG(4, "nfsrv_dscreate: dvp=%p fname=%s\n", dvp, bufp);

        /* Create the date file in the DS mount. */
        error = NFSVOPLOCK(dvp, LK_EXCLUSIVE);
        if (error == 0) {
                error = VOP_CREATE(dvp, &nvp, &named.ni_cnd, vap);
                vref(dvp);
                VOP_VPUT_PAIR(dvp, error == 0 ? &nvp : NULL, false);
                if (error == 0) {
                        /* Set the ownership of the file. */
                        error = VOP_SETATTR(nvp, nvap, tcred);
                        NFSD_DEBUG(4, "nfsrv_dscreate:"
                            " setattr-uid=%d\n", error);
                        if (error != 0)
                                vput(nvp);
                }
                if (error != 0)
                        printf("pNFS: pnfscreate failed=%d\n", error);
        } else
                printf("pNFS: pnfscreate vnlock=%d\n", error);
        if (error == 0) {
                np = VTONFS(nvp);
                nmp = VFSTONFS(nvp->v_mount);
                if (strcmp(nvp->v_mount->mnt_vfc->vfc_name, "nfs")
                    != 0 || nmp->nm_nam->sa_len > sizeof(
                    struct sockaddr_in6) ||
                    np->n_fhp->nfh_len != NFSX_MYFH) {
                        printf("Bad DS file: fstype=%s salen=%d"
                            " fhlen=%d\n",
                            nvp->v_mount->mnt_vfc->vfc_name,
                            nmp->nm_nam->sa_len, np->n_fhp->nfh_len);
                        error = ENOENT;
                }

                /* Set extattrs for the DS on the MDS file. */
                if (error == 0) {
                        if (dsa != NULL) {
                                error = VOP_GETATTR(nvp, &va, tcred);
                                if (error == 0) {
                                        dsa->dsa_filerev = va.va_filerev;
                                        dsa->dsa_size = va.va_size;
                                        dsa->dsa_atime = va.va_atime;
                                        dsa->dsa_mtime = va.va_mtime;
                                        dsa->dsa_bytes = va.va_bytes;
                                }
                        }
                        if (error == 0) {
                                NFSBCOPY(np->n_fhp->nfh_fh, &pf->dsf_fh,
                                    NFSX_MYFH);
                                NFSBCOPY(nmp->nm_nam, &pf->dsf_sin,
                                    nmp->nm_nam->sa_len);
                                NFSBCOPY(named.ni_cnd.cn_nameptr,
                                    pf->dsf_filename,
                                    sizeof(pf->dsf_filename));
                        }
                } else
                        printf("pNFS: pnfscreate can't get DS"
                            " attr=%d\n", error);
                if (nvpp != NULL && error == 0)
                        *nvpp = nvp;
                else
                        vput(nvp);
        }
        nfsvno_relpathbuf(&named);
        return (error);
}

/*
 * Start up the thread that will execute nfsrv_dscreate().
 */
static void
start_dscreate(void *arg, int pending)
{
        struct nfsrvdscreate *dsc;

        dsc = (struct nfsrvdscreate *)arg;
        dsc->err = nfsrv_dscreate(dsc->dvp, &dsc->createva, &dsc->va, &dsc->fh,
            dsc->pf, NULL, NULL, dsc->tcred, dsc->p, NULL);
        dsc->done = 1;
        NFSD_DEBUG(4, "start_dscreate: err=%d\n", dsc->err);
}

/*
 * Create a pNFS data file on the Data Server(s).
 */
static void
nfsrv_pnfscreate(struct vnode *vp, struct vattr *vap, struct ucred *cred,
    NFSPROC_T *p)
{
        struct nfsrvdscreate *dsc, *tdsc = NULL;
        struct nfsdevice *ds, *tds, *fds;
        struct mount *mp;
        struct pnfsdsfile *pf, *tpf;
        struct pnfsdsattr dsattr;
        struct vattr va;
        struct vnode *dvp[NFSDEV_MAXMIRRORS];
        struct nfsmount *nmp;
        fhandle_t fh;
        uid_t vauid;
        gid_t vagid;
        u_short vamode;
        struct ucred *tcred;
        int dsdir[NFSDEV_MAXMIRRORS], error, i, mirrorcnt, ret;
        int failpos, timo;

        /* Get a DS server directory in a round-robin order. */
        mirrorcnt = 1;
        mp = vp->v_mount;
        ds = fds = NULL;
        NFSDDSLOCK();
        /*
         * Search for the first entry that handles this MDS fs, but use the
         * first entry for all MDS fs's otherwise.
         */
        TAILQ_FOREACH(tds, &nfsrv_devidhead, nfsdev_list) {
                if (tds->nfsdev_nmp != NULL) {
                        if (tds->nfsdev_mdsisset == 0 && ds == NULL)
                                ds = tds;
                        else if (tds->nfsdev_mdsisset != 0 && fsidcmp(
                            &mp->mnt_stat.f_fsid, &tds->nfsdev_mdsfsid) == 0) {
                                ds = fds = tds;
                                break;
                        }
                }
        }
        if (ds == NULL) {
                NFSDDSUNLOCK();
                NFSD_DEBUG(4, "nfsrv_pnfscreate: no srv\n");
                return;
        }
        i = dsdir[0] = ds->nfsdev_nextdir;
        ds->nfsdev_nextdir = (ds->nfsdev_nextdir + 1) % nfsrv_dsdirsize;
        dvp[0] = ds->nfsdev_dsdir[i];
        tds = TAILQ_NEXT(ds, nfsdev_list);
        if (nfsrv_maxpnfsmirror > 1 && tds != NULL) {
                TAILQ_FOREACH_FROM(tds, &nfsrv_devidhead, nfsdev_list) {
                        if (tds->nfsdev_nmp != NULL &&
                            ((tds->nfsdev_mdsisset == 0 && fds == NULL) ||
                             (tds->nfsdev_mdsisset != 0 && fds != NULL &&
                              fsidcmp(&mp->mnt_stat.f_fsid,
                              &tds->nfsdev_mdsfsid) == 0))) {
                                dsdir[mirrorcnt] = i;
                                dvp[mirrorcnt] = tds->nfsdev_dsdir[i];
                                mirrorcnt++;
                                if (mirrorcnt >= nfsrv_maxpnfsmirror)
                                        break;
                        }
                }
        }
        /* Put at end of list to implement round-robin usage. */
        TAILQ_REMOVE(&nfsrv_devidhead, ds, nfsdev_list);
        TAILQ_INSERT_TAIL(&nfsrv_devidhead, ds, nfsdev_list);
        NFSDDSUNLOCK();
        dsc = NULL;
        if (mirrorcnt > 1)
                tdsc = dsc = malloc(sizeof(*dsc) * (mirrorcnt - 1), M_TEMP,
                    M_WAITOK | M_ZERO);
        tpf = pf = malloc(sizeof(*pf) * nfsrv_maxpnfsmirror, M_TEMP, M_WAITOK |
            M_ZERO);

        error = nfsvno_getfh(vp, &fh, p);
        if (error == 0)
                error = VOP_GETATTR(vp, &va, cred);
        if (error == 0) {
                /* Set the attributes for "vp" to Setattr the DS vp. */
                vauid = va.va_uid;
                vagid = va.va_gid;
                vamode = va.va_mode;
                VATTR_NULL(&va);
                va.va_uid = vauid;
                va.va_gid = vagid;
                va.va_mode = vamode;
                va.va_size = 0;
        } else
                printf("pNFS: pnfscreate getfh+attr=%d\n", error);

        NFSD_DEBUG(4, "nfsrv_pnfscreate: cruid=%d crgid=%d\n", cred->cr_uid,
            cred->cr_gid);
        /* Make data file name based on FH. */
        tcred = newnfs_getcred();

        /*
         * Create the file on each DS mirror, using kernel process(es) for the
         * additional mirrors.
         */
        failpos = -1;
        for (i = 0; i < mirrorcnt - 1 && error == 0; i++, tpf++, tdsc++) {
                tpf->dsf_dir = dsdir[i];
                tdsc->tcred = tcred;
                tdsc->p = p;
                tdsc->pf = tpf;
                tdsc->createva = *vap;
                NFSBCOPY(&fh, &tdsc->fh, sizeof(fh));
                tdsc->va = va;
                tdsc->dvp = dvp[i];
                tdsc->done = 0;
                tdsc->inprog = 0;
                tdsc->err = 0;
                ret = EIO;
                if (nfs_pnfsiothreads != 0) {
                        ret = nfs_pnfsio(start_dscreate, tdsc);
                        NFSD_DEBUG(4, "nfsrv_pnfscreate: nfs_pnfsio=%d\n", ret);
                }
                if (ret != 0) {
                        ret = nfsrv_dscreate(dvp[i], vap, &va, &fh, tpf, NULL,
                            NULL, tcred, p, NULL);
                        if (ret != 0) {
                                KASSERT(error == 0, ("nfsrv_dscreate err=%d",
                                    error));
                                if (failpos == -1 && nfsds_failerr(ret))
                                        failpos = i;
                                else
                                        error = ret;
                        }
                }
        }
        if (error == 0) {
                tpf->dsf_dir = dsdir[mirrorcnt - 1];
                error = nfsrv_dscreate(dvp[mirrorcnt - 1], vap, &va, &fh, tpf,
                    &dsattr, NULL, tcred, p, NULL);
                if (failpos == -1 && mirrorcnt > 1 && nfsds_failerr(error)) {
                        failpos = mirrorcnt - 1;
                        error = 0;
                }
        }
        timo = hz / 50;         /* Wait for 20msec. */
        if (timo < 1)
                timo = 1;
        /* Wait for kernel task(s) to complete. */
        for (tdsc = dsc, i = 0; i < mirrorcnt - 1; i++, tdsc++) {
                while (tdsc->inprog != 0 && tdsc->done == 0)
                        tsleep(&tdsc->tsk, PVFS, "srvdcr", timo);
                if (tdsc->err != 0) {
                        if (failpos == -1 && nfsds_failerr(tdsc->err))
                                failpos = i;
                        else if (error == 0)
                                error = tdsc->err;
                }
        }

        /*
         * If failpos has been set, that mirror has failed, so it needs
         * to be disabled.
         */
        if (failpos >= 0) {
                nmp = VFSTONFS(dvp[failpos]->v_mount);
                NFSLOCKMNT(nmp);
                if ((nmp->nm_privflag & (NFSMNTP_FORCEDISM |
                     NFSMNTP_CANCELRPCS)) == 0) {
                        nmp->nm_privflag |= NFSMNTP_CANCELRPCS;
                        NFSUNLOCKMNT(nmp);
                        ds = nfsrv_deldsnmp(PNFSDOP_DELDSSERVER, nmp, p);
                        NFSD_DEBUG(4, "dscreatfail fail=%d ds=%p\n", failpos,
                            ds);
                        if (ds != NULL)
                                nfsrv_killrpcs(nmp);
                        NFSLOCKMNT(nmp);
                        nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
                        wakeup(nmp);
                }
                NFSUNLOCKMNT(nmp);
        }

        NFSFREECRED(tcred);
        if (error == 0) {
                ASSERT_VOP_ELOCKED(vp, "nfsrv_pnfscreate vp");

                NFSD_DEBUG(4, "nfsrv_pnfscreate: mirrorcnt=%d maxmirror=%d\n",
                    mirrorcnt, nfsrv_maxpnfsmirror);
                /*
                 * For all mirrors that couldn't be created, fill in the
                 * *pf structure, but with an IP address == 0.0.0.0.
                 */
                tpf = pf + mirrorcnt;
                for (i = mirrorcnt; i < nfsrv_maxpnfsmirror; i++, tpf++) {
                        *tpf = *pf;
                        tpf->dsf_sin.sin_family = AF_INET;
                        tpf->dsf_sin.sin_len = sizeof(struct sockaddr_in);
                        tpf->dsf_sin.sin_addr.s_addr = 0;
                        tpf->dsf_sin.sin_port = 0;
                }

                error = vn_extattr_set(vp, IO_NODELOCKED,
                    EXTATTR_NAMESPACE_SYSTEM, "pnfsd.dsfile",
                    sizeof(*pf) * nfsrv_maxpnfsmirror, (char *)pf, p);
                if (error == 0)
                        error = vn_extattr_set(vp, IO_NODELOCKED,
                            EXTATTR_NAMESPACE_SYSTEM, "pnfsd.dsattr",
                            sizeof(dsattr), (char *)&dsattr, p);
                if (error != 0)
                        printf("pNFS: pnfscreate setextattr=%d\n",
                            error);
        } else
                printf("pNFS: pnfscreate=%d\n", error);
        free(pf, M_TEMP);
        free(dsc, M_TEMP);
}

/*
 * Get the information needed to remove the pNFS Data Server file from the
 * Metadata file.  Upon success, ddvp is set non-NULL to the locked
 * DS directory vnode.  The caller must unlock *ddvp when done with it.
 */
static void
nfsrv_pnfsremovesetup(struct vnode *vp, NFSPROC_T *p, struct vnode **dvpp,
    int *mirrorcntp, char *fname, fhandle_t *fhp)
{
        struct vattr va;
        struct ucred *tcred;
        char *buf;
        int buflen, error;

        dvpp[0] = NULL;
        /* If not an exported regular file or not a pNFS server, just return. */
        if (vp->v_type != VREG || (vp->v_mount->mnt_flag & MNT_EXPORTED) == 0 ||
            nfsrv_devidcnt == 0)
                return;

        /* Check to see if this is the last hard link. */
        tcred = newnfs_getcred();
        error = VOP_GETATTR(vp, &va, tcred);
        NFSFREECRED(tcred);
        if (error != 0) {
                printf("pNFS: nfsrv_pnfsremovesetup getattr=%d\n", error);
                return;
        }
        if (va.va_nlink > 1)
                return;

        error = nfsvno_getfh(vp, fhp, p);
        if (error != 0) {
                printf("pNFS: nfsrv_pnfsremovesetup getfh=%d\n", error);
                return;
        }

        buflen = 1024;
        buf = malloc(buflen, M_TEMP, M_WAITOK);
        /* Get the directory vnode for the DS mount and the file handle. */
        error = nfsrv_dsgetsockmnt(vp, 0, buf, &buflen, mirrorcntp, p, dvpp,
            NULL, NULL, fname, NULL, NULL, NULL, NULL, NULL);
        free(buf, M_TEMP);
        if (error != 0)
                printf("pNFS: nfsrv_pnfsremovesetup getsockmnt=%d\n", error);
}

/*
 * Remove a DS data file for nfsrv_pnfsremove(). Called for each mirror.
 * The arguments are in a structure, so that they can be passed through
 * taskqueue for a kernel process to execute this function.
 */
struct nfsrvdsremove {
        int                     done;
        int                     inprog;
        struct task             tsk;
        struct ucred            *tcred;
        struct vnode            *dvp;
        NFSPROC_T               *p;
        int                     err;
        char                    fname[PNFS_FILENAME_LEN + 1];
};

static int
nfsrv_dsremove(struct vnode *dvp, char *fname, struct ucred *tcred,
    NFSPROC_T *p)
{
        struct nameidata named;
        struct vnode *nvp;
        char *bufp;
        u_long *hashp;
        int error;

        error = NFSVOPLOCK(dvp, LK_EXCLUSIVE);
        if (error != 0)
                return (error);
        named.ni_cnd.cn_nameiop = DELETE;
        named.ni_cnd.cn_lkflags = LK_EXCLUSIVE | LK_RETRY;
        named.ni_cnd.cn_cred = tcred;
        named.ni_cnd.cn_thread = p;
        named.ni_cnd.cn_flags = ISLASTCN | LOCKPARENT | LOCKLEAF | SAVENAME;
        nfsvno_setpathbuf(&named, &bufp, &hashp);
        named.ni_cnd.cn_nameptr = bufp;
        named.ni_cnd.cn_namelen = strlen(fname);
        strlcpy(bufp, fname, NAME_MAX);
        NFSD_DEBUG(4, "nfsrv_pnfsremove: filename=%s\n", bufp);
        error = VOP_LOOKUP(dvp, &nvp, &named.ni_cnd);
        NFSD_DEBUG(4, "nfsrv_pnfsremove: aft LOOKUP=%d\n", error);
        if (error == 0) {
                error = VOP_REMOVE(dvp, nvp, &named.ni_cnd);
                vput(nvp);
        }
        NFSVOPUNLOCK(dvp);
        nfsvno_relpathbuf(&named);
        if (error != 0)
                printf("pNFS: nfsrv_pnfsremove failed=%d\n", error);
        return (error);
}

/*
 * Start up the thread that will execute nfsrv_dsremove().
 */
static void
start_dsremove(void *arg, int pending)
{
        struct nfsrvdsremove *dsrm;

        dsrm = (struct nfsrvdsremove *)arg;
        dsrm->err = nfsrv_dsremove(dsrm->dvp, dsrm->fname, dsrm->tcred,
            dsrm->p);
        dsrm->done = 1;
        NFSD_DEBUG(4, "start_dsremove: err=%d\n", dsrm->err);
}

/*
 * Remove a pNFS data file from a Data Server.
 * nfsrv_pnfsremovesetup() must have been called before the MDS file was
 * removed to set up the dvp and fill in the FH.
 */
static void
nfsrv_pnfsremove(struct vnode **dvp, int mirrorcnt, char *fname, fhandle_t *fhp,
    NFSPROC_T *p)
{
        struct ucred *tcred;
        struct nfsrvdsremove *dsrm, *tdsrm;
        struct nfsdevice *ds;
        struct nfsmount *nmp;
        int failpos, i, ret, timo;

        tcred = newnfs_getcred();
        dsrm = NULL;
        if (mirrorcnt > 1)
                dsrm = malloc(sizeof(*dsrm) * mirrorcnt - 1, M_TEMP, M_WAITOK);
        /*
         * Remove the file on each DS mirror, using kernel process(es) for the
         * additional mirrors.
         */
        failpos = -1;
        for (tdsrm = dsrm, i = 0; i < mirrorcnt - 1; i++, tdsrm++) {
                tdsrm->tcred = tcred;
                tdsrm->p = p;
                tdsrm->dvp = dvp[i];
                strlcpy(tdsrm->fname, fname, PNFS_FILENAME_LEN + 1);
                tdsrm->inprog = 0;
                tdsrm->done = 0;
                tdsrm->err = 0;
                ret = EIO;
                if (nfs_pnfsiothreads != 0) {
                        ret = nfs_pnfsio(start_dsremove, tdsrm);
                        NFSD_DEBUG(4, "nfsrv_pnfsremove: nfs_pnfsio=%d\n", ret);
                }
                if (ret != 0) {
                        ret = nfsrv_dsremove(dvp[i], fname, tcred, p);
                        if (failpos == -1 && nfsds_failerr(ret))
                                failpos = i;
                }
        }
        ret = nfsrv_dsremove(dvp[mirrorcnt - 1], fname, tcred, p);
        if (failpos == -1 && mirrorcnt > 1 && nfsds_failerr(ret))
                failpos = mirrorcnt - 1;
        timo = hz / 50;         /* Wait for 20msec. */
        if (timo < 1)
                timo = 1;
        /* Wait for kernel task(s) to complete. */
        for (tdsrm = dsrm, i = 0; i < mirrorcnt - 1; i++, tdsrm++) {
                while (tdsrm->inprog != 0 && tdsrm->done == 0)
                        tsleep(&tdsrm->tsk, PVFS, "srvdsrm", timo);
                if (failpos == -1 && nfsds_failerr(tdsrm->err))
                        failpos = i;
        }

        /*
         * If failpos has been set, that mirror has failed, so it needs
         * to be disabled.
         */
        if (failpos >= 0) {
                nmp = VFSTONFS(dvp[failpos]->v_mount);
                NFSLOCKMNT(nmp);
                if ((nmp->nm_privflag & (NFSMNTP_FORCEDISM |
                     NFSMNTP_CANCELRPCS)) == 0) {
                        nmp->nm_privflag |= NFSMNTP_CANCELRPCS;
                        NFSUNLOCKMNT(nmp);
                        ds = nfsrv_deldsnmp(PNFSDOP_DELDSSERVER, nmp, p);
                        NFSD_DEBUG(4, "dsremovefail fail=%d ds=%p\n", failpos,
                            ds);
                        if (ds != NULL)
                                nfsrv_killrpcs(nmp);
                        NFSLOCKMNT(nmp);
                        nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
                        wakeup(nmp);
                }
                NFSUNLOCKMNT(nmp);
        }

        /* Get rid all layouts for the file. */
        nfsrv_freefilelayouts(fhp);

        NFSFREECRED(tcred);
        free(dsrm, M_TEMP);
}

/*
 * Generate a file name based on the file handle and put it in *bufp.
 * Return the number of bytes generated.
 */
static int
nfsrv_putfhname(fhandle_t *fhp, char *bufp)
{
        int i;
        uint8_t *cp;
        const uint8_t *hexdigits = "0123456789abcdef";

        cp = (uint8_t *)fhp;
        for (i = 0; i < sizeof(*fhp); i++) {
                bufp[2 * i] = hexdigits[(*cp >> 4) & 0xf];
                bufp[2 * i + 1] = hexdigits[*cp++ & 0xf];
        }
        bufp[2 * i] = '\0';
        return (2 * i);
}

/*
 * Update the Metadata file's attributes from the DS file when a Read/Write
 * layout is returned.
 * Basically just call nfsrv_proxyds() with procedure == NFSPROC_LAYOUTRETURN
 * so that it does a nfsrv_getattrdsrpc() and nfsrv_setextattr() on the DS file.
 */
int
nfsrv_updatemdsattr(struct vnode *vp, struct nfsvattr *nap, NFSPROC_T *p)
{
        struct ucred *tcred;
        int error;

        /* Do this as root so that it won't fail with EACCES. */
        tcred = newnfs_getcred();
        error = nfsrv_proxyds(vp, 0, 0, tcred, p, NFSPROC_LAYOUTRETURN,
            NULL, NULL, NULL, nap, NULL, NULL, 0, NULL);
        NFSFREECRED(tcred);
        return (error);
}

/*
 * Set the NFSv4 ACL on the DS file to the same ACL as the MDS file.
 */
static int
nfsrv_dssetacl(struct vnode *vp, struct acl *aclp, struct ucred *cred,
    NFSPROC_T *p)
{
        int error;

        error = nfsrv_proxyds(vp, 0, 0, cred, p, NFSPROC_SETACL,
            NULL, NULL, NULL, NULL, aclp, NULL, 0, NULL);
        return (error);
}

static int
nfsrv_proxyds(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
    struct thread *p, int ioproc, struct mbuf **mpp, char *cp,
    struct mbuf **mpp2, struct nfsvattr *nap, struct acl *aclp,
    off_t *offp, int content, bool *eofp)
{
        struct nfsmount *nmp[NFSDEV_MAXMIRRORS], *failnmp;
        fhandle_t fh[NFSDEV_MAXMIRRORS];
        struct vnode *dvp[NFSDEV_MAXMIRRORS];
        struct nfsdevice *ds;
        struct pnfsdsattr dsattr;
        struct opnfsdsattr odsattr;
        char *buf;
        int buflen, error, failpos, i, mirrorcnt, origmircnt, trycnt;

        NFSD_DEBUG(4, "in nfsrv_proxyds\n");
        /*
         * If not a regular file, not exported or not a pNFS server,
         * just return ENOENT.
         */
        if (vp->v_type != VREG || (vp->v_mount->mnt_flag & MNT_EXPORTED) == 0 ||
            nfsrv_devidcnt == 0)
                return (ENOENT);

        buflen = 1024;
        buf = malloc(buflen, M_TEMP, M_WAITOK);
        error = 0;

        /*
         * For Getattr, get the Change attribute (va_filerev) and size (va_size)
         * from the MetaData file's extended attribute.
         */
        if (ioproc == NFSPROC_GETATTR) {
                error = vn_extattr_get(vp, IO_NODELOCKED,
                    EXTATTR_NAMESPACE_SYSTEM, "pnfsd.dsattr", &buflen, buf,
                    p);
                if (error == 0) {
                        if (buflen == sizeof(odsattr)) {
                                NFSBCOPY(buf, &odsattr, buflen);
                                nap->na_filerev = odsattr.dsa_filerev;
                                nap->na_size = odsattr.dsa_size;
                                nap->na_atime = odsattr.dsa_atime;
                                nap->na_mtime = odsattr.dsa_mtime;
                                /*
                                 * Fake na_bytes by rounding up na_size.
                                 * Since we don't know the block size, just
                                 * use BLKDEV_IOSIZE.
                                 */
                                nap->na_bytes = (odsattr.dsa_size +
                                    BLKDEV_IOSIZE - 1) & ~(BLKDEV_IOSIZE - 1);
                        } else if (buflen == sizeof(dsattr)) {
                                NFSBCOPY(buf, &dsattr, buflen);
                                nap->na_filerev = dsattr.dsa_filerev;
                                nap->na_size = dsattr.dsa_size;
                                nap->na_atime = dsattr.dsa_atime;
                                nap->na_mtime = dsattr.dsa_mtime;
                                nap->na_bytes = dsattr.dsa_bytes;
                        } else
                                error = ENXIO;
                }
                if (error == 0) {
                        /*
                         * If nfsrv_pnfsgetdsattr is 0 or nfsrv_checkdsattr()
                         * returns 0, just return now.  nfsrv_checkdsattr()
                         * returns 0 if there is no Read/Write layout
                         * plus either an Open/Write_access or Write
                         * delegation issued to a client for the file.
                         */
                        if (nfsrv_pnfsgetdsattr == 0 ||
                            nfsrv_checkdsattr(vp, p) == 0) {
                                free(buf, M_TEMP);
                                return (error);
                        }
                }

                /*
                 * Clear ENOATTR so the code below will attempt to do a
                 * nfsrv_getattrdsrpc() to get the attributes and (re)create
                 * the extended attribute.
                 */
                if (error == ENOATTR)
                        error = 0;
        }

        origmircnt = -1;
        trycnt = 0;
tryagain:
        if (error == 0) {
                buflen = 1024;
                if (ioproc == NFSPROC_READDS && NFSVOPISLOCKED(vp) ==
                    LK_EXCLUSIVE)
                        printf("nfsrv_proxyds: Readds vp exclusively locked\n");
                error = nfsrv_dsgetsockmnt(vp, LK_SHARED, buf, &buflen,
                    &mirrorcnt, p, dvp, fh, NULL, NULL, NULL, NULL, NULL,
                    NULL, NULL);
                if (error == 0) {
                        for (i = 0; i < mirrorcnt; i++)
                                nmp[i] = VFSTONFS(dvp[i]->v_mount);
                } else
                        printf("pNFS: proxy getextattr sockaddr=%d\n", error);
        } else
                printf("pNFS: nfsrv_dsgetsockmnt=%d\n", error);
        if (error == 0) {
                failpos = -1;
                if (origmircnt == -1)
                        origmircnt = mirrorcnt;
                /*
                 * If failpos is set to a mirror#, then that mirror has
                 * failed and will be disabled. For Read, Getattr and Seek, the
                 * function only tries one mirror, so if that mirror has
                 * failed, it will need to be retried. As such, increment
                 * tryitagain for these cases.
                 * For Write, Setattr and Setacl, the function tries all
                 * mirrors and will not return an error for the case where
                 * one mirror has failed. For these cases, the functioning
                 * mirror(s) will have been modified, so a retry isn't
                 * necessary. These functions will set failpos for the
                 * failed mirror#.
                 */
                if (ioproc == NFSPROC_READDS) {
                        error = nfsrv_readdsrpc(fh, off, cnt, cred, p, nmp[0],
                            mpp, mpp2);
                        if (nfsds_failerr(error) && mirrorcnt > 1) {
                                /*
                                 * Setting failpos will cause the mirror
                                 * to be disabled and then a retry of this
                                 * read is required.
                                 */
                                failpos = 0;
                                error = 0;
                                trycnt++;
                        }
                } else if (ioproc == NFSPROC_WRITEDS)
                        error = nfsrv_writedsrpc(fh, off, cnt, cred, p, vp,
                            &nmp[0], mirrorcnt, mpp, cp, &failpos);
                else if (ioproc == NFSPROC_SETATTR)
                        error = nfsrv_setattrdsrpc(fh, cred, p, vp, &nmp[0],
                            mirrorcnt, nap, &failpos);
                else if (ioproc == NFSPROC_SETACL)
                        error = nfsrv_setacldsrpc(fh, cred, p, vp, &nmp[0],
                            mirrorcnt, aclp, &failpos);
                else if (ioproc == NFSPROC_SEEKDS) {
                        error = nfsrv_seekdsrpc(fh, offp, content, eofp, cred,
                            p, nmp[0]);
                        if (nfsds_failerr(error) && mirrorcnt > 1) {
                                /*
                                 * Setting failpos will cause the mirror
                                 * to be disabled and then a retry of this
                                 * read is required.
                                 */
                                failpos = 0;
                                error = 0;
                                trycnt++;
                        }
                } else if (ioproc == NFSPROC_ALLOCATE)
                        error = nfsrv_allocatedsrpc(fh, off, *offp, cred, p, vp,
                            &nmp[0], mirrorcnt, &failpos);
                else {
                        error = nfsrv_getattrdsrpc(&fh[mirrorcnt - 1], cred, p,
                            vp, nmp[mirrorcnt - 1], nap);
                        if (nfsds_failerr(error) && mirrorcnt > 1) {
                                /*
                                 * Setting failpos will cause the mirror
                                 * to be disabled and then a retry of this
                                 * getattr is required.
                                 */
                                failpos = mirrorcnt - 1;
                                error = 0;
                                trycnt++;
                        }
                }
                ds = NULL;
                if (failpos >= 0) {
                        failnmp = nmp[failpos];
                        NFSLOCKMNT(failnmp);
                        if ((failnmp->nm_privflag & (NFSMNTP_FORCEDISM |
                             NFSMNTP_CANCELRPCS)) == 0) {
                                failnmp->nm_privflag |= NFSMNTP_CANCELRPCS;
                                NFSUNLOCKMNT(failnmp);
                                ds = nfsrv_deldsnmp(PNFSDOP_DELDSSERVER,
                                    failnmp, p);
                                NFSD_DEBUG(4, "dsldsnmp fail=%d ds=%p\n",
                                    failpos, ds);
                                if (ds != NULL)
                                        nfsrv_killrpcs(failnmp);
                                NFSLOCKMNT(failnmp);
                                failnmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
                                wakeup(failnmp);
                        }
                        NFSUNLOCKMNT(failnmp);
                }
                for (i = 0; i < mirrorcnt; i++)
                        NFSVOPUNLOCK(dvp[i]);
                NFSD_DEBUG(4, "nfsrv_proxyds: aft RPC=%d trya=%d\n", error,
                    trycnt);
                /* Try the Read/Getattr again if a mirror was deleted. */
                if (ds != NULL && trycnt > 0 && trycnt < origmircnt)
                        goto tryagain;
        } else {
                /* Return ENOENT for any Extended Attribute error. */
                error = ENOENT;
        }
        free(buf, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_proxyds: error=%d\n", error);
        return (error);
}

/*
 * Get the DS mount point, fh and directory from the "pnfsd.dsfile" extended
 * attribute.
 * newnmpp - If it points to a non-NULL nmp, that is the destination and needs
 *           to be checked.  If it points to a NULL nmp, then it returns
 *           a suitable destination.
 * curnmp - If non-NULL, it is the source mount for the copy.
 */
int
nfsrv_dsgetsockmnt(struct vnode *vp, int lktype, char *buf, int *buflenp,
    int *mirrorcntp, NFSPROC_T *p, struct vnode **dvpp, fhandle_t *fhp,
    char *devid, char *fnamep, struct vnode **nvpp, struct nfsmount **newnmpp,
    struct nfsmount *curnmp, int *ippos, int *dsdirp)
{
        struct vnode *dvp, *nvp = NULL, **tdvpp;
        struct mount *mp;
        struct nfsmount *nmp, *newnmp;
        struct sockaddr *sad;
        struct sockaddr_in *sin;
        struct nfsdevice *ds, *tds, *fndds;
        struct pnfsdsfile *pf;
        uint32_t dsdir;
        int error, fhiszero, fnd, gotone, i, mirrorcnt;

        ASSERT_VOP_LOCKED(vp, "nfsrv_dsgetsockmnt vp");
        *mirrorcntp = 1;
        tdvpp = dvpp;
        if (nvpp != NULL)
                *nvpp = NULL;
        if (dvpp != NULL)
                *dvpp = NULL;
        if (ippos != NULL)
                *ippos = -1;
        if (newnmpp != NULL)
                newnmp = *newnmpp;
        else
                newnmp = NULL;
        mp = vp->v_mount;
        error = vn_extattr_get(vp, IO_NODELOCKED, EXTATTR_NAMESPACE_SYSTEM,
            "pnfsd.dsfile", buflenp, buf, p);
        mirrorcnt = *buflenp / sizeof(*pf);
        if (error == 0 && (mirrorcnt < 1 || mirrorcnt > NFSDEV_MAXMIRRORS ||
            *buflenp != sizeof(*pf) * mirrorcnt))
                error = ENOATTR;

        pf = (struct pnfsdsfile *)buf;
        /* If curnmp != NULL, check for a match in the mirror list. */
        if (curnmp != NULL && error == 0) {
                fnd = 0;
                for (i = 0; i < mirrorcnt; i++, pf++) {
                        sad = (struct sockaddr *)&pf->dsf_sin;
                        if (nfsaddr2_match(sad, curnmp->nm_nam)) {
                                if (ippos != NULL)
                                        *ippos = i;
                                fnd = 1;
                                break;
                        }
                }
                if (fnd == 0)
                        error = ENXIO;
        }

        gotone = 0;
        pf = (struct pnfsdsfile *)buf;
        NFSD_DEBUG(4, "nfsrv_dsgetsockmnt: mirrorcnt=%d err=%d\n", mirrorcnt,
            error);
        for (i = 0; i < mirrorcnt && error == 0; i++, pf++) {
                fhiszero = 0;
                sad = (struct sockaddr *)&pf->dsf_sin;
                sin = &pf->dsf_sin;
                dsdir = pf->dsf_dir;
                if (dsdir >= nfsrv_dsdirsize) {
                        printf("nfsrv_dsgetsockmnt: dsdir=%d\n", dsdir);
                        error = ENOATTR;
                } else if (nvpp != NULL && newnmp != NULL &&
                    nfsaddr2_match(sad, newnmp->nm_nam))
                        error = EEXIST;
                if (error == 0) {
                        if (ippos != NULL && curnmp == NULL &&
                            sad->sa_family == AF_INET &&
                            sin->sin_addr.s_addr == 0)
                                *ippos = i;
                        if (NFSBCMP(&zerofh, &pf->dsf_fh, sizeof(zerofh)) == 0)
                                fhiszero = 1;
                        /* Use the socket address to find the mount point. */
                        fndds = NULL;
                        NFSDDSLOCK();
                        /* Find a match for the IP address. */
                        TAILQ_FOREACH(ds, &nfsrv_devidhead, nfsdev_list) {
                                if (ds->nfsdev_nmp != NULL) {
                                        dvp = ds->nfsdev_dvp;
                                        nmp = VFSTONFS(dvp->v_mount);
                                        if (nmp != ds->nfsdev_nmp)
                                                printf("different2 nmp %p %p\n",
                                                    nmp, ds->nfsdev_nmp);
                                        if (nfsaddr2_match(sad, nmp->nm_nam)) {
                                                fndds = ds;
                                                break;
                                        }
                                }
                        }
                        if (fndds != NULL && newnmpp != NULL &&
                            newnmp == NULL) {
                                /* Search for a place to make a mirror copy. */
                                TAILQ_FOREACH(tds, &nfsrv_devidhead,
                                    nfsdev_list) {
                                        if (tds->nfsdev_nmp != NULL &&
                                            fndds != tds &&
                                            ((tds->nfsdev_mdsisset == 0 &&
                                              fndds->nfsdev_mdsisset == 0) ||
                                             (tds->nfsdev_mdsisset != 0 &&
                                              fndds->nfsdev_mdsisset != 0 &&
                                              fsidcmp(&tds->nfsdev_mdsfsid,
                                              &mp->mnt_stat.f_fsid) == 0))) {
                                                *newnmpp = tds->nfsdev_nmp;
                                                break;
                                        }
                                }
                                if (tds != NULL) {
                                        /*
                                         * Move this entry to the end of the
                                         * list, so it won't be selected as
                                         * easily the next time.
                                         */
                                        TAILQ_REMOVE(&nfsrv_devidhead, tds,
                                            nfsdev_list);
                                        TAILQ_INSERT_TAIL(&nfsrv_devidhead, tds,
                                            nfsdev_list);
                                }
                        }
                        NFSDDSUNLOCK();
                        if (fndds != NULL) {
                                dvp = fndds->nfsdev_dsdir[dsdir];
                                if (lktype != 0 || fhiszero != 0 ||
                                    (nvpp != NULL && *nvpp == NULL)) {
                                        if (fhiszero != 0)
                                                error = vn_lock(dvp,
                                                    LK_EXCLUSIVE);
                                        else if (lktype != 0)
                                                error = vn_lock(dvp, lktype);
                                        else
                                                error = vn_lock(dvp, LK_SHARED);
                                        /*
                                         * If the file handle is all 0's, try to
                                         * do a Lookup against the DS to acquire
                                         * it.
                                         * If dvpp == NULL or the Lookup fails,
                                         * unlock dvp after the call.
                                         */
                                        if (error == 0 && (fhiszero != 0 ||
                                            (nvpp != NULL && *nvpp == NULL))) {
                                                error = nfsrv_pnfslookupds(vp,
                                                    dvp, pf, &nvp, p);
                                                if (error == 0) {
                                                        if (fhiszero != 0)
                                                                nfsrv_pnfssetfh(
                                                                    vp, pf,
                                                                    devid,
                                                                    fnamep,
                                                                    nvp, p);
                                                        if (nvpp != NULL &&
                                                            *nvpp == NULL) {
                                                                *nvpp = nvp;
                                                                *dsdirp = dsdir;
                                                        } else
                                                                vput(nvp);
                                                }
                                                if (error != 0 || lktype == 0)
                                                        NFSVOPUNLOCK(dvp);
                                        }
                                }
                                if (error == 0) {
                                        gotone++;
                                        NFSD_DEBUG(4, "gotone=%d\n", gotone);
                                        if (devid != NULL) {
                                                NFSBCOPY(fndds->nfsdev_deviceid,
                                                    devid, NFSX_V4DEVICEID);
                                                devid += NFSX_V4DEVICEID;
                                        }
                                        if (dvpp != NULL)
                                                *tdvpp++ = dvp;
                                        if (fhp != NULL)
                                                NFSBCOPY(&pf->dsf_fh, fhp++,
                                                    NFSX_MYFH);
                                        if (fnamep != NULL && gotone == 1)
                                                strlcpy(fnamep,
                                                    pf->dsf_filename,
                                                    sizeof(pf->dsf_filename));
                                } else
                                        NFSD_DEBUG(4, "nfsrv_dsgetsockmnt "
                                            "err=%d\n", error);
                        }
                }
        }
        if (error == 0 && gotone == 0)
                error = ENOENT;

        NFSD_DEBUG(4, "eo nfsrv_dsgetsockmnt: gotone=%d err=%d\n", gotone,
            error);
        if (error == 0)
                *mirrorcntp = gotone;
        else {
                if (gotone > 0 && dvpp != NULL) {
                        /*
                         * If the error didn't occur on the first one and
                         * dvpp != NULL, the one(s) prior to the failure will
                         * have locked dvp's that need to be unlocked.
                         */
                        for (i = 0; i < gotone; i++) {
                                NFSVOPUNLOCK(*dvpp);
                                *dvpp++ = NULL;
                        }
                }
                /*
                 * If it found the vnode to be copied from before a failure,
                 * it needs to be vput()'d.
                 */
                if (nvpp != NULL && *nvpp != NULL) {
                        vput(*nvpp);
                        *nvpp = NULL;
                }
        }
        return (error);
}

/*
 * Set the extended attribute for the Change attribute.
 */
static int
nfsrv_setextattr(struct vnode *vp, struct nfsvattr *nap, NFSPROC_T *p)
{
        struct pnfsdsattr dsattr;
        int error;

        ASSERT_VOP_ELOCKED(vp, "nfsrv_setextattr vp");
        dsattr.dsa_filerev = nap->na_filerev;
        dsattr.dsa_size = nap->na_size;
        dsattr.dsa_atime = nap->na_atime;
        dsattr.dsa_mtime = nap->na_mtime;
        dsattr.dsa_bytes = nap->na_bytes;
        error = vn_extattr_set(vp, IO_NODELOCKED, EXTATTR_NAMESPACE_SYSTEM,
            "pnfsd.dsattr", sizeof(dsattr), (char *)&dsattr, p);
        if (error != 0)
                printf("pNFS: setextattr=%d\n", error);
        return (error);
}

static int
nfsrv_readdsrpc(fhandle_t *fhp, off_t off, int len, struct ucred *cred,
    NFSPROC_T *p, struct nfsmount *nmp, struct mbuf **mpp, struct mbuf **mpendp)
{
        uint32_t *tl;
        struct nfsrv_descript *nd;
        nfsv4stateid_t st;
        struct mbuf *m, *m2;
        int error = 0, retlen, tlen, trimlen;

        NFSD_DEBUG(4, "in nfsrv_readdsrpc\n");
        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        *mpp = NULL;
        /*
         * Use a stateid where other is an alternating 01010 pattern and
         * seqid is 0xffffffff.  This value is not defined as special by
         * the RFC and is used by the FreeBSD NFS server to indicate an
         * MDS->DS proxy operation.
         */
        st.other[0] = 0x55555555;
        st.other[1] = 0x55555555;
        st.other[2] = 0x55555555;
        st.seqid = 0xffffffff;
        nfscl_reqstart(nd, NFSPROC_READDS, nmp, (u_int8_t *)fhp, sizeof(*fhp),
            NULL, NULL, 0, 0);
        nfsm_stateidtom(nd, &st, NFSSTATEID_PUTSTATEID);
        NFSM_BUILD(tl, uint32_t *, NFSX_UNSIGNED * 3);
        txdr_hyper(off, tl);
        *(tl + 2) = txdr_unsigned(len);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p, cred,
            NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        if (nd->nd_repstat == 0) {
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                NFSM_STRSIZ(retlen, len);
                if (retlen > 0) {
                        /* Trim off the pre-data XDR from the mbuf chain. */
                        m = nd->nd_mrep;
                        while (m != NULL && m != nd->nd_md) {
                                if (m->m_next == nd->nd_md) {
                                        m->m_next = NULL;
                                        m_freem(nd->nd_mrep);
                                        nd->nd_mrep = m = nd->nd_md;
                                } else
                                        m = m->m_next;
                        }
                        if (m == NULL) {
                                printf("nfsrv_readdsrpc: busted mbuf list\n");
                                error = ENOENT;
                                goto nfsmout;
                        }

                        /*
                         * Now, adjust first mbuf so that any XDR before the
                         * read data is skipped over.
                         */
                        trimlen = nd->nd_dpos - mtod(m, char *);
                        if (trimlen > 0) {
                                m->m_len -= trimlen;
                                NFSM_DATAP(m, trimlen);
                        }

                        /*
                         * Truncate the mbuf chain at retlen bytes of data,
                         * plus XDR padding that brings the length up to a
                         * multiple of 4.
                         */
                        tlen = NFSM_RNDUP(retlen);
                        do {
                                if (m->m_len >= tlen) {
                                        m->m_len = tlen;
                                        tlen = 0;
                                        m2 = m->m_next;
                                        m->m_next = NULL;
                                        m_freem(m2);
                                        break;
                                }
                                tlen -= m->m_len;
                                m = m->m_next;
                        } while (m != NULL);
                        if (tlen > 0) {
                                printf("nfsrv_readdsrpc: busted mbuf list\n");
                                error = ENOENT;
                                goto nfsmout;
                        }
                        *mpp = nd->nd_mrep;
                        *mpendp = m;
                        nd->nd_mrep = NULL;
                }
        } else
                error = nd->nd_repstat;
nfsmout:
        /* If nd->nd_mrep is already NULL, this is a no-op. */
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_readdsrpc error=%d\n", error);
        return (error);
}

/*
 * Do a write RPC on a DS data file, using this structure for the arguments,
 * so that this function can be executed by a separate kernel process.
 */
struct nfsrvwritedsdorpc {
        int                     done;
        int                     inprog;
        struct task             tsk;
        fhandle_t               fh;
        off_t                   off;
        int                     len;
        struct nfsmount         *nmp;
        struct ucred            *cred;
        NFSPROC_T               *p;
        struct mbuf             *m;
        int                     err;
};

static int
nfsrv_writedsdorpc(struct nfsmount *nmp, fhandle_t *fhp, off_t off, int len,
    struct nfsvattr *nap, struct mbuf *m, struct ucred *cred, NFSPROC_T *p)
{
        uint32_t *tl;
        struct nfsrv_descript *nd;
        nfsattrbit_t attrbits;
        nfsv4stateid_t st;
        int commit, error, retlen;

        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        nfscl_reqstart(nd, NFSPROC_WRITE, nmp, (u_int8_t *)fhp,
            sizeof(fhandle_t), NULL, NULL, 0, 0);

        /*
         * Use a stateid where other is an alternating 01010 pattern and
         * seqid is 0xffffffff.  This value is not defined as special by
         * the RFC and is used by the FreeBSD NFS server to indicate an
         * MDS->DS proxy operation.
         */
        st.other[0] = 0x55555555;
        st.other[1] = 0x55555555;
        st.other[2] = 0x55555555;
        st.seqid = 0xffffffff;
        nfsm_stateidtom(nd, &st, NFSSTATEID_PUTSTATEID);
        NFSM_BUILD(tl, u_int32_t *, NFSX_HYPER + 2 * NFSX_UNSIGNED);
        txdr_hyper(off, tl);
        tl += 2;
        /*
         * Do all writes FileSync, since the server doesn't hold onto dirty
         * buffers.  Since clients should be accessing the DS servers directly
         * using the pNFS layouts, this just needs to work correctly as a
         * fallback.
         */
        *tl++ = txdr_unsigned(NFSWRITE_FILESYNC);
        *tl = txdr_unsigned(len);
        NFSD_DEBUG(4, "nfsrv_writedsdorpc: len=%d\n", len);

        /* Put data in mbuf chain. */
        nd->nd_mb->m_next = m;

        /* Set nd_mb and nd_bpos to end of data. */
        while (m->m_next != NULL)
                m = m->m_next;
        nd->nd_mb = m;
        nfsm_set(nd, m->m_len);
        NFSD_DEBUG(4, "nfsrv_writedsdorpc: lastmb len=%d\n", m->m_len);

        /* Do a Getattr for the attributes that change upon writing. */
        NFSZERO_ATTRBIT(&attrbits);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SIZE);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_CHANGE);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEACCESS);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEMODIFY);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SPACEUSED);
        NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
        *tl = txdr_unsigned(NFSV4OP_GETATTR);
        (void) nfsrv_putattrbit(nd, &attrbits);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p,
            cred, NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        NFSD_DEBUG(4, "nfsrv_writedsdorpc: aft writerpc=%d\n", nd->nd_repstat);
        /* Get rid of weak cache consistency data for now. */
        if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR)) ==
            (ND_NFSV4 | ND_V4WCCATTR)) {
                error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL, NULL,
                    NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
                NFSD_DEBUG(4, "nfsrv_writedsdorpc: wcc attr=%d\n", error);
                if (error != 0)
                        goto nfsmout;
                /*
                 * Get rid of Op# and status for next op.
                 */
                NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
                if (*++tl != 0)
                        nd->nd_flag |= ND_NOMOREDATA;
        }
        if (nd->nd_repstat == 0) {
                NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED + NFSX_VERF);
                retlen = fxdr_unsigned(int, *tl++);
                commit = fxdr_unsigned(int, *tl);
                if (commit != NFSWRITE_FILESYNC)
                        error = NFSERR_IO;
                NFSD_DEBUG(4, "nfsrv_writedsdorpc:retlen=%d commit=%d err=%d\n",
                    retlen, commit, error);
        } else
                error = nd->nd_repstat;
        /* We have no use for the Write Verifier since we use FileSync. */

        /*
         * Get the Change, Size, Access Time and Modify Time attributes and set
         * on the Metadata file, so its attributes will be what the file's
         * would be if it had been written.
         */
        if (error == 0) {
                NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
                error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL, NULL,
                    NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
        }
        NFSD_DEBUG(4, "nfsrv_writedsdorpc: aft loadattr=%d\n", error);
nfsmout:
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_writedsdorpc error=%d\n", error);
        return (error);
}

/*
 * Start up the thread that will execute nfsrv_writedsdorpc().
 */
static void
start_writedsdorpc(void *arg, int pending)
{
        struct nfsrvwritedsdorpc *drpc;

        drpc = (struct nfsrvwritedsdorpc *)arg;
        drpc->err = nfsrv_writedsdorpc(drpc->nmp, &drpc->fh, drpc->off,
            drpc->len, NULL, drpc->m, drpc->cred, drpc->p);
        drpc->done = 1;
        NFSD_DEBUG(4, "start_writedsdorpc: err=%d\n", drpc->err);
}

static int
nfsrv_writedsrpc(fhandle_t *fhp, off_t off, int len, struct ucred *cred,
    NFSPROC_T *p, struct vnode *vp, struct nfsmount **nmpp, int mirrorcnt,
    struct mbuf **mpp, char *cp, int *failposp)
{
        struct nfsrvwritedsdorpc *drpc, *tdrpc = NULL;
        struct nfsvattr na;
        struct mbuf *m;
        int error, i, offs, ret, timo;

        NFSD_DEBUG(4, "in nfsrv_writedsrpc\n");
        KASSERT(*mpp != NULL, ("nfsrv_writedsrpc: NULL mbuf chain"));
        drpc = NULL;
        if (mirrorcnt > 1)
                tdrpc = drpc = malloc(sizeof(*drpc) * (mirrorcnt - 1), M_TEMP,
                    M_WAITOK);

        /* Calculate offset in mbuf chain that data starts. */
        offs = cp - mtod(*mpp, char *);
        NFSD_DEBUG(4, "nfsrv_writedsrpc: mcopy offs=%d len=%d\n", offs, len);

        /*
         * Do the write RPC for every DS, using a separate kernel process
         * for every DS except the last one.
         */
        error = 0;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                tdrpc->done = 0;
                NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp));
                tdrpc->off = off;
                tdrpc->len = len;
                tdrpc->nmp = *nmpp;
                tdrpc->cred = cred;
                tdrpc->p = p;
                tdrpc->inprog = 0;
                tdrpc->err = 0;
                tdrpc->m = m_copym(*mpp, offs, NFSM_RNDUP(len), M_WAITOK);
                ret = EIO;
                if (nfs_pnfsiothreads != 0) {
                        ret = nfs_pnfsio(start_writedsdorpc, tdrpc);
                        NFSD_DEBUG(4, "nfsrv_writedsrpc: nfs_pnfsio=%d\n",
                            ret);
                }
                if (ret != 0) {
                        ret = nfsrv_writedsdorpc(*nmpp, fhp, off, len, NULL,
                            tdrpc->m, cred, p);
                        if (nfsds_failerr(ret) && *failposp == -1)
                                *failposp = i;
                        else if (error == 0 && ret != 0)
                                error = ret;
                }
                nmpp++;
                fhp++;
        }
        m = m_copym(*mpp, offs, NFSM_RNDUP(len), M_WAITOK);
        ret = nfsrv_writedsdorpc(*nmpp, fhp, off, len, &na, m, cred, p);
        if (nfsds_failerr(ret) && *failposp == -1 && mirrorcnt > 1)
                *failposp = mirrorcnt - 1;
        else if (error == 0 && ret != 0)
                error = ret;
        if (error == 0)
                error = nfsrv_setextattr(vp, &na, p);
        NFSD_DEBUG(4, "nfsrv_writedsrpc: aft setextat=%d\n", error);
        tdrpc = drpc;
        timo = hz / 50;         /* Wait for 20msec. */
        if (timo < 1)
                timo = 1;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                /* Wait for RPCs on separate threads to complete. */
                while (tdrpc->inprog != 0 && tdrpc->done == 0)
                        tsleep(&tdrpc->tsk, PVFS, "srvwrds", timo);
                if (nfsds_failerr(tdrpc->err) && *failposp == -1)
                        *failposp = i;
                else if (error == 0 && tdrpc->err != 0)
                        error = tdrpc->err;
        }
        free(drpc, M_TEMP);
        return (error);
}

/*
 * Do a allocate RPC on a DS data file, using this structure for the arguments,
 * so that this function can be executed by a separate kernel process.
 */
struct nfsrvallocatedsdorpc {
        int                     done;
        int                     inprog;
        struct task             tsk;
        fhandle_t               fh;
        off_t                   off;
        off_t                   len;
        struct nfsmount         *nmp;
        struct ucred            *cred;
        NFSPROC_T               *p;
        int                     err;
};

static int
nfsrv_allocatedsdorpc(struct nfsmount *nmp, fhandle_t *fhp, off_t off,
    off_t len, struct nfsvattr *nap, struct ucred *cred, NFSPROC_T *p)
{
        uint32_t *tl;
        struct nfsrv_descript *nd;
        nfsattrbit_t attrbits;
        nfsv4stateid_t st;
        int error;

        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        nfscl_reqstart(nd, NFSPROC_ALLOCATE, nmp, (u_int8_t *)fhp,
            sizeof(fhandle_t), NULL, NULL, 0, 0);

        /*
         * Use a stateid where other is an alternating 01010 pattern and
         * seqid is 0xffffffff.  This value is not defined as special by
         * the RFC and is used by the FreeBSD NFS server to indicate an
         * MDS->DS proxy operation.
         */
        st.other[0] = 0x55555555;
        st.other[1] = 0x55555555;
        st.other[2] = 0x55555555;
        st.seqid = 0xffffffff;
        nfsm_stateidtom(nd, &st, NFSSTATEID_PUTSTATEID);
        NFSM_BUILD(tl, uint32_t *, 2 * NFSX_HYPER + NFSX_UNSIGNED);
        txdr_hyper(off, tl); tl += 2;
        txdr_hyper(len, tl); tl += 2;
        NFSD_DEBUG(4, "nfsrv_allocatedsdorpc: len=%jd\n", (intmax_t)len);

        *tl = txdr_unsigned(NFSV4OP_GETATTR);
        NFSGETATTR_ATTRBIT(&attrbits);
        nfsrv_putattrbit(nd, &attrbits);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p,
            cred, NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        NFSD_DEBUG(4, "nfsrv_allocatedsdorpc: aft allocaterpc=%d\n",
            nd->nd_repstat);
        if (nd->nd_repstat == 0) {
                NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
                error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL, NULL,
                    NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
        } else
                error = nd->nd_repstat;
        NFSD_DEBUG(4, "nfsrv_allocatedsdorpc: aft loadattr=%d\n", error);
nfsmout:
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_allocatedsdorpc error=%d\n", error);
        return (error);
}

/*
 * Start up the thread that will execute nfsrv_allocatedsdorpc().
 */
static void
start_allocatedsdorpc(void *arg, int pending)
{
        struct nfsrvallocatedsdorpc *drpc;

        drpc = (struct nfsrvallocatedsdorpc *)arg;
        drpc->err = nfsrv_allocatedsdorpc(drpc->nmp, &drpc->fh, drpc->off,
            drpc->len, NULL, drpc->cred, drpc->p);
        drpc->done = 1;
        NFSD_DEBUG(4, "start_allocatedsdorpc: err=%d\n", drpc->err);
}

static int
nfsrv_allocatedsrpc(fhandle_t *fhp, off_t off, off_t len, struct ucred *cred,
    NFSPROC_T *p, struct vnode *vp, struct nfsmount **nmpp, int mirrorcnt,
    int *failposp)
{
        struct nfsrvallocatedsdorpc *drpc, *tdrpc = NULL;
        struct nfsvattr na;
        int error, i, ret, timo;

        NFSD_DEBUG(4, "in nfsrv_allocatedsrpc\n");
        drpc = NULL;
        if (mirrorcnt > 1)
                tdrpc = drpc = malloc(sizeof(*drpc) * (mirrorcnt - 1), M_TEMP,
                    M_WAITOK);

        /*
         * Do the allocate RPC for every DS, using a separate kernel process
         * for every DS except the last one.
         */
        error = 0;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                tdrpc->done = 0;
                NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp));
                tdrpc->off = off;
                tdrpc->len = len;
                tdrpc->nmp = *nmpp;
                tdrpc->cred = cred;
                tdrpc->p = p;
                tdrpc->inprog = 0;
                tdrpc->err = 0;
                ret = EIO;
                if (nfs_pnfsiothreads != 0) {
                        ret = nfs_pnfsio(start_allocatedsdorpc, tdrpc);
                        NFSD_DEBUG(4, "nfsrv_allocatedsrpc: nfs_pnfsio=%d\n",
                            ret);
                }
                if (ret != 0) {
                        ret = nfsrv_allocatedsdorpc(*nmpp, fhp, off, len, NULL,
                            cred, p);
                        if (nfsds_failerr(ret) && *failposp == -1)
                                *failposp = i;
                        else if (error == 0 && ret != 0)
                                error = ret;
                }
                nmpp++;
                fhp++;
        }
        ret = nfsrv_allocatedsdorpc(*nmpp, fhp, off, len, &na, cred, p);
        if (nfsds_failerr(ret) && *failposp == -1 && mirrorcnt > 1)
                *failposp = mirrorcnt - 1;
        else if (error == 0 && ret != 0)
                error = ret;
        if (error == 0)
                error = nfsrv_setextattr(vp, &na, p);
        NFSD_DEBUG(4, "nfsrv_allocatedsrpc: aft setextat=%d\n", error);
        tdrpc = drpc;
        timo = hz / 50;         /* Wait for 20msec. */
        if (timo < 1)
                timo = 1;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                /* Wait for RPCs on separate threads to complete. */
                while (tdrpc->inprog != 0 && tdrpc->done == 0)
                        tsleep(&tdrpc->tsk, PVFS, "srvalds", timo);
                if (nfsds_failerr(tdrpc->err) && *failposp == -1)
                        *failposp = i;
                else if (error == 0 && tdrpc->err != 0)
                        error = tdrpc->err;
        }
        free(drpc, M_TEMP);
        return (error);
}

static int
nfsrv_setattrdsdorpc(fhandle_t *fhp, struct ucred *cred, NFSPROC_T *p,
    struct vnode *vp, struct nfsmount *nmp, struct nfsvattr *nap,
    struct nfsvattr *dsnap)
{
        uint32_t *tl;
        struct nfsrv_descript *nd;
        nfsv4stateid_t st;
        nfsattrbit_t attrbits;
        int error;

        NFSD_DEBUG(4, "in nfsrv_setattrdsdorpc\n");
        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        /*
         * Use a stateid where other is an alternating 01010 pattern and
         * seqid is 0xffffffff.  This value is not defined as special by
         * the RFC and is used by the FreeBSD NFS server to indicate an
         * MDS->DS proxy operation.
         */
        st.other[0] = 0x55555555;
        st.other[1] = 0x55555555;
        st.other[2] = 0x55555555;
        st.seqid = 0xffffffff;
        nfscl_reqstart(nd, NFSPROC_SETATTR, nmp, (u_int8_t *)fhp, sizeof(*fhp),
            NULL, NULL, 0, 0);
        nfsm_stateidtom(nd, &st, NFSSTATEID_PUTSTATEID);
        nfscl_fillsattr(nd, &nap->na_vattr, vp, NFSSATTR_FULL, 0);

        /* Do a Getattr for the attributes that change due to writing. */
        NFSZERO_ATTRBIT(&attrbits);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SIZE);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_CHANGE);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEACCESS);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEMODIFY);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SPACEUSED);
        NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
        *tl = txdr_unsigned(NFSV4OP_GETATTR);
        (void) nfsrv_putattrbit(nd, &attrbits);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p, cred,
            NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        NFSD_DEBUG(4, "nfsrv_setattrdsdorpc: aft setattrrpc=%d\n",
            nd->nd_repstat);
        /* Get rid of weak cache consistency data for now. */
        if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR)) ==
            (ND_NFSV4 | ND_V4WCCATTR)) {
                error = nfsv4_loadattr(nd, NULL, dsnap, NULL, NULL, 0, NULL,
                    NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
                NFSD_DEBUG(4, "nfsrv_setattrdsdorpc: wcc attr=%d\n", error);
                if (error != 0)
                        goto nfsmout;
                /*
                 * Get rid of Op# and status for next op.
                 */
                NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
                if (*++tl != 0)
                        nd->nd_flag |= ND_NOMOREDATA;
        }
        error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
        if (error != 0)
                goto nfsmout;
        if (nd->nd_repstat != 0)
                error = nd->nd_repstat;
        /*
         * Get the Change, Size, Access Time and Modify Time attributes and set
         * on the Metadata file, so its attributes will be what the file's
         * would be if it had been written.
         */
        if (error == 0) {
                NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
                error = nfsv4_loadattr(nd, NULL, dsnap, NULL, NULL, 0, NULL,
                    NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
        }
        NFSD_DEBUG(4, "nfsrv_setattrdsdorpc: aft setattr loadattr=%d\n", error);
nfsmout:
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_setattrdsdorpc error=%d\n", error);
        return (error);
}

struct nfsrvsetattrdsdorpc {
        int                     done;
        int                     inprog;
        struct task             tsk;
        fhandle_t               fh;
        struct nfsmount         *nmp;
        struct vnode            *vp;
        struct ucred            *cred;
        NFSPROC_T               *p;
        struct nfsvattr         na;
        struct nfsvattr         dsna;
        int                     err;
};

/*
 * Start up the thread that will execute nfsrv_setattrdsdorpc().
 */
static void
start_setattrdsdorpc(void *arg, int pending)
{
        struct nfsrvsetattrdsdorpc *drpc;

        drpc = (struct nfsrvsetattrdsdorpc *)arg;
        drpc->err = nfsrv_setattrdsdorpc(&drpc->fh, drpc->cred, drpc->p,
            drpc->vp, drpc->nmp, &drpc->na, &drpc->dsna);
        drpc->done = 1;
}

static int
nfsrv_setattrdsrpc(fhandle_t *fhp, struct ucred *cred, NFSPROC_T *p,
    struct vnode *vp, struct nfsmount **nmpp, int mirrorcnt,
    struct nfsvattr *nap, int *failposp)
{
        struct nfsrvsetattrdsdorpc *drpc, *tdrpc = NULL;
        struct nfsvattr na;
        int error, i, ret, timo;

        NFSD_DEBUG(4, "in nfsrv_setattrdsrpc\n");
        drpc = NULL;
        if (mirrorcnt > 1)
                tdrpc = drpc = malloc(sizeof(*drpc) * (mirrorcnt - 1), M_TEMP,
                    M_WAITOK);

        /*
         * Do the setattr RPC for every DS, using a separate kernel process
         * for every DS except the last one.
         */
        error = 0;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                tdrpc->done = 0;
                tdrpc->inprog = 0;
                NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp));
                tdrpc->nmp = *nmpp;
                tdrpc->vp = vp;
                tdrpc->cred = cred;
                tdrpc->p = p;
                tdrpc->na = *nap;
                tdrpc->err = 0;
                ret = EIO;
                if (nfs_pnfsiothreads != 0) {
                        ret = nfs_pnfsio(start_setattrdsdorpc, tdrpc);
                        NFSD_DEBUG(4, "nfsrv_setattrdsrpc: nfs_pnfsio=%d\n",
                            ret);
                }
                if (ret != 0) {
                        ret = nfsrv_setattrdsdorpc(fhp, cred, p, vp, *nmpp, nap,
                            &na);
                        if (nfsds_failerr(ret) && *failposp == -1)
                                *failposp = i;
                        else if (error == 0 && ret != 0)
                                error = ret;
                }
                nmpp++;
                fhp++;
        }
        ret = nfsrv_setattrdsdorpc(fhp, cred, p, vp, *nmpp, nap, &na);
        if (nfsds_failerr(ret) && *failposp == -1 && mirrorcnt > 1)
                *failposp = mirrorcnt - 1;
        else if (error == 0 && ret != 0)
                error = ret;
        if (error == 0)
                error = nfsrv_setextattr(vp, &na, p);
        NFSD_DEBUG(4, "nfsrv_setattrdsrpc: aft setextat=%d\n", error);
        tdrpc = drpc;
        timo = hz / 50;         /* Wait for 20msec. */
        if (timo < 1)
                timo = 1;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                /* Wait for RPCs on separate threads to complete. */
                while (tdrpc->inprog != 0 && tdrpc->done == 0)
                        tsleep(&tdrpc->tsk, PVFS, "srvsads", timo);
                if (nfsds_failerr(tdrpc->err) && *failposp == -1)
                        *failposp = i;
                else if (error == 0 && tdrpc->err != 0)
                        error = tdrpc->err;
        }
        free(drpc, M_TEMP);
        return (error);
}

/*
 * Do a Setattr of an NFSv4 ACL on the DS file.
 */
static int
nfsrv_setacldsdorpc(fhandle_t *fhp, struct ucred *cred, NFSPROC_T *p,
    struct vnode *vp, struct nfsmount *nmp, struct acl *aclp)
{
        struct nfsrv_descript *nd;
        nfsv4stateid_t st;
        nfsattrbit_t attrbits;
        int error;

        NFSD_DEBUG(4, "in nfsrv_setacldsdorpc\n");
        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        /*
         * Use a stateid where other is an alternating 01010 pattern and
         * seqid is 0xffffffff.  This value is not defined as special by
         * the RFC and is used by the FreeBSD NFS server to indicate an
         * MDS->DS proxy operation.
         */
        st.other[0] = 0x55555555;
        st.other[1] = 0x55555555;
        st.other[2] = 0x55555555;
        st.seqid = 0xffffffff;
        nfscl_reqstart(nd, NFSPROC_SETACL, nmp, (u_int8_t *)fhp, sizeof(*fhp),
            NULL, NULL, 0, 0);
        nfsm_stateidtom(nd, &st, NFSSTATEID_PUTSTATEID);
        NFSZERO_ATTRBIT(&attrbits);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_ACL);
        /*
         * The "vp" argument to nfsv4_fillattr() is only used for vnode_type(),
         * so passing in the metadata "vp" will be ok, since it is of
         * the same type (VREG).
         */
        nfsv4_fillattr(nd, NULL, vp, aclp, NULL, NULL, 0, &attrbits, NULL,
            NULL, 0, 0, 0, 0, 0, NULL);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p, cred,
            NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        NFSD_DEBUG(4, "nfsrv_setacldsdorpc: aft setaclrpc=%d\n",
            nd->nd_repstat);
        error = nd->nd_repstat;
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        return (error);
}

struct nfsrvsetacldsdorpc {
        int                     done;
        int                     inprog;
        struct task             tsk;
        fhandle_t               fh;
        struct nfsmount         *nmp;
        struct vnode            *vp;
        struct ucred            *cred;
        NFSPROC_T               *p;
        struct acl              *aclp;
        int                     err;
};

/*
 * Start up the thread that will execute nfsrv_setacldsdorpc().
 */
static void
start_setacldsdorpc(void *arg, int pending)
{
        struct nfsrvsetacldsdorpc *drpc;

        drpc = (struct nfsrvsetacldsdorpc *)arg;
        drpc->err = nfsrv_setacldsdorpc(&drpc->fh, drpc->cred, drpc->p,
            drpc->vp, drpc->nmp, drpc->aclp);
        drpc->done = 1;
}

static int
nfsrv_setacldsrpc(fhandle_t *fhp, struct ucred *cred, NFSPROC_T *p,
    struct vnode *vp, struct nfsmount **nmpp, int mirrorcnt, struct acl *aclp,
    int *failposp)
{
        struct nfsrvsetacldsdorpc *drpc, *tdrpc = NULL;
        int error, i, ret, timo;

        NFSD_DEBUG(4, "in nfsrv_setacldsrpc\n");
        drpc = NULL;
        if (mirrorcnt > 1)
                tdrpc = drpc = malloc(sizeof(*drpc) * (mirrorcnt - 1), M_TEMP,
                    M_WAITOK);

        /*
         * Do the setattr RPC for every DS, using a separate kernel process
         * for every DS except the last one.
         */
        error = 0;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                tdrpc->done = 0;
                tdrpc->inprog = 0;
                NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp));
                tdrpc->nmp = *nmpp;
                tdrpc->vp = vp;
                tdrpc->cred = cred;
                tdrpc->p = p;
                tdrpc->aclp = aclp;
                tdrpc->err = 0;
                ret = EIO;
                if (nfs_pnfsiothreads != 0) {
                        ret = nfs_pnfsio(start_setacldsdorpc, tdrpc);
                        NFSD_DEBUG(4, "nfsrv_setacldsrpc: nfs_pnfsio=%d\n",
                            ret);
                }
                if (ret != 0) {
                        ret = nfsrv_setacldsdorpc(fhp, cred, p, vp, *nmpp,
                            aclp);
                        if (nfsds_failerr(ret) && *failposp == -1)
                                *failposp = i;
                        else if (error == 0 && ret != 0)
                                error = ret;
                }
                nmpp++;
                fhp++;
        }
        ret = nfsrv_setacldsdorpc(fhp, cred, p, vp, *nmpp, aclp);
        if (nfsds_failerr(ret) && *failposp == -1 && mirrorcnt > 1)
                *failposp = mirrorcnt - 1;
        else if (error == 0 && ret != 0)
                error = ret;
        NFSD_DEBUG(4, "nfsrv_setacldsrpc: aft setextat=%d\n", error);
        tdrpc = drpc;
        timo = hz / 50;         /* Wait for 20msec. */
        if (timo < 1)
                timo = 1;
        for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) {
                /* Wait for RPCs on separate threads to complete. */
                while (tdrpc->inprog != 0 && tdrpc->done == 0)
                        tsleep(&tdrpc->tsk, PVFS, "srvacds", timo);
                if (nfsds_failerr(tdrpc->err) && *failposp == -1)
                        *failposp = i;
                else if (error == 0 && tdrpc->err != 0)
                        error = tdrpc->err;
        }
        free(drpc, M_TEMP);
        return (error);
}

/*
 * Getattr call to the DS for the attributes that change due to writing.
 */
static int
nfsrv_getattrdsrpc(fhandle_t *fhp, struct ucred *cred, NFSPROC_T *p,
    struct vnode *vp, struct nfsmount *nmp, struct nfsvattr *nap)
{
        struct nfsrv_descript *nd;
        int error;
        nfsattrbit_t attrbits;

        NFSD_DEBUG(4, "in nfsrv_getattrdsrpc\n");
        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        nfscl_reqstart(nd, NFSPROC_GETATTR, nmp, (u_int8_t *)fhp,
            sizeof(fhandle_t), NULL, NULL, 0, 0);
        NFSZERO_ATTRBIT(&attrbits);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SIZE);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_CHANGE);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEACCESS);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEMODIFY);
        NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SPACEUSED);
        (void) nfsrv_putattrbit(nd, &attrbits);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p, cred,
            NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        NFSD_DEBUG(4, "nfsrv_getattrdsrpc: aft getattrrpc=%d\n",
            nd->nd_repstat);
        if (nd->nd_repstat == 0) {
                error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0,
                    NULL, NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL,
                    NULL, NULL);
                /*
                 * We can only save the updated values in the extended
                 * attribute if the vp is exclusively locked.
                 * This should happen when any of the following operations
                 * occur on the vnode:
                 *    Close, Delegreturn, LayoutCommit, LayoutReturn
                 * As such, the updated extended attribute should get saved
                 * before nfsrv_checkdsattr() returns 0 and allows the cached
                 * attributes to be returned without calling this function.
                 */
                if (error == 0 && VOP_ISLOCKED(vp) == LK_EXCLUSIVE) {
                        error = nfsrv_setextattr(vp, nap, p);
                        NFSD_DEBUG(4, "nfsrv_getattrdsrpc: aft setextat=%d\n",
                            error);
                }
        } else
                error = nd->nd_repstat;
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_getattrdsrpc error=%d\n", error);
        return (error);
}

/*
 * Seek call to a DS.
 */
static int
nfsrv_seekdsrpc(fhandle_t *fhp, off_t *offp, int content, bool *eofp,
    struct ucred *cred, NFSPROC_T *p, struct nfsmount *nmp)
{
        uint32_t *tl;
        struct nfsrv_descript *nd;
        nfsv4stateid_t st;
        int error;

        NFSD_DEBUG(4, "in nfsrv_seekdsrpc\n");
        /*
         * Use a stateid where other is an alternating 01010 pattern and
         * seqid is 0xffffffff.  This value is not defined as special by
         * the RFC and is used by the FreeBSD NFS server to indicate an
         * MDS->DS proxy operation.
         */
        st.other[0] = 0x55555555;
        st.other[1] = 0x55555555;
        st.other[2] = 0x55555555;
        st.seqid = 0xffffffff;
        nd = malloc(sizeof(*nd), M_TEMP, M_WAITOK | M_ZERO);
        nfscl_reqstart(nd, NFSPROC_SEEKDS, nmp, (u_int8_t *)fhp,
            sizeof(fhandle_t), NULL, NULL, 0, 0);
        nfsm_stateidtom(nd, &st, NFSSTATEID_PUTSTATEID);
        NFSM_BUILD(tl, uint32_t *, NFSX_HYPER + NFSX_UNSIGNED);
        txdr_hyper(*offp, tl); tl += 2;
        *tl = txdr_unsigned(content);
        error = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, NULL, p, cred,
            NFS_PROG, NFS_VER4, NULL, 1, NULL, NULL);
        if (error != 0) {
                free(nd, M_TEMP);
                return (error);
        }
        NFSD_DEBUG(4, "nfsrv_seekdsrpc: aft seekrpc=%d\n", nd->nd_repstat);
        if (nd->nd_repstat == 0) {
                NFSM_DISSECT(tl, uint32_t *, NFSX_UNSIGNED + NFSX_HYPER);
                if (*tl++ == newnfs_true)
                        *eofp = true;
                else
                        *eofp = false;
                *offp = fxdr_hyper(tl);
        } else
                error = nd->nd_repstat;
nfsmout:
        m_freem(nd->nd_mrep);
        free(nd, M_TEMP);
        NFSD_DEBUG(4, "nfsrv_seekdsrpc error=%d\n", error);
        return (error);
}

/*
 * Get the device id and file handle for a DS file.
 */
int
nfsrv_dsgetdevandfh(struct vnode *vp, NFSPROC_T *p, int *mirrorcntp,
    fhandle_t *fhp, char *devid)
{
        int buflen, error;
        char *buf;

        buflen = 1024;
        buf = malloc(buflen, M_TEMP, M_WAITOK);
        error = nfsrv_dsgetsockmnt(vp, 0, buf, &buflen, mirrorcntp, p, NULL,
            fhp, devid, NULL, NULL, NULL, NULL, NULL, NULL);
        free(buf, M_TEMP);
        return (error);
}

/*
 * Do a Lookup against the DS for the filename.
 */
static int
nfsrv_pnfslookupds(struct vnode *vp, struct vnode *dvp, struct pnfsdsfile *pf,
    struct vnode **nvpp, NFSPROC_T *p)
{
        struct nameidata named;
        struct ucred *tcred;
        char *bufp;
        u_long *hashp;
        struct vnode *nvp;
        int error;

        tcred = newnfs_getcred();
        named.ni_cnd.cn_nameiop = LOOKUP;
        named.ni_cnd.cn_lkflags = LK_SHARED | LK_RETRY;
        named.ni_cnd.cn_cred = tcred;
        named.ni_cnd.cn_thread = p;
        named.ni_cnd.cn_flags = ISLASTCN | LOCKPARENT | LOCKLEAF | SAVENAME;
        nfsvno_setpathbuf(&named, &bufp, &hashp);
        named.ni_cnd.cn_nameptr = bufp;
        named.ni_cnd.cn_namelen = strlen(pf->dsf_filename);
        strlcpy(bufp, pf->dsf_filename, NAME_MAX);
        NFSD_DEBUG(4, "nfsrv_pnfslookupds: filename=%s\n", bufp);
        error = VOP_LOOKUP(dvp, &nvp, &named.ni_cnd);
        NFSD_DEBUG(4, "nfsrv_pnfslookupds: aft LOOKUP=%d\n", error);
        NFSFREECRED(tcred);
        nfsvno_relpathbuf(&named);
        if (error == 0)
                *nvpp = nvp;
        NFSD_DEBUG(4, "eo nfsrv_pnfslookupds=%d\n", error);
        return (error);
}

/*
 * Set the file handle to the correct one.
 */
static void
nfsrv_pnfssetfh(struct vnode *vp, struct pnfsdsfile *pf, char *devid,
    char *fnamep, struct vnode *nvp, NFSPROC_T *p)
{
        struct nfsnode *np;
        int ret = 0;

        np = VTONFS(nvp);
        NFSBCOPY(np->n_fhp->nfh_fh, &pf->dsf_fh, NFSX_MYFH);
        /*
         * We can only do a vn_set_extattr() if the vnode is exclusively
         * locked and vn_start_write() has been done.  If devid != NULL or
         * fnamep != NULL or the vnode is shared locked, vn_start_write()
         * may not have been done.
         * If not done now, it will be done on a future call.
         */
        if (devid == NULL && fnamep == NULL && NFSVOPISLOCKED(vp) ==
            LK_EXCLUSIVE)
                ret = vn_extattr_set(vp, IO_NODELOCKED,
                    EXTATTR_NAMESPACE_SYSTEM, "pnfsd.dsfile", sizeof(*pf),
                    (char *)pf, p);
        NFSD_DEBUG(4, "eo nfsrv_pnfssetfh=%d\n", ret);
}

/*
 * Cause RPCs waiting on "nmp" to fail.  This is called for a DS mount point
 * when the DS has failed.
 */
void
nfsrv_killrpcs(struct nfsmount *nmp)
{

        /*
         * Call newnfs_nmcancelreqs() to cause
         * any RPCs in progress on the mount point to
         * fail.
         * This will cause any process waiting for an
         * RPC to complete while holding a vnode lock
         * on the mounted-on vnode (such as "df" or
         * a non-forced "umount") to fail.
         * This will unlock the mounted-on vnode so
         * a forced dismount can succeed.
         * The NFSMNTP_CANCELRPCS flag should be set when this function is
         * called.
         */
        newnfs_nmcancelreqs(nmp);
}

/*
 * Sum up the statfs info for each of the DSs, so that the client will
 * receive the total for all DSs.
 */
static int
nfsrv_pnfsstatfs(struct statfs *sf, struct mount *mp)
{
        struct statfs *tsf;
        struct nfsdevice *ds;
        struct vnode **dvpp, **tdvpp, *dvp;
        uint64_t tot;
        int cnt, error = 0, i;

        if (nfsrv_devidcnt <= 0)
                return (ENXIO);
        dvpp = mallocarray(nfsrv_devidcnt, sizeof(*dvpp), M_TEMP, M_WAITOK);
        tsf = malloc(sizeof(*tsf), M_TEMP, M_WAITOK);

        /* Get an array of the dvps for the DSs. */
        tdvpp = dvpp;
        i = 0;
        NFSDDSLOCK();
        /* First, search for matches for same file system. */
        TAILQ_FOREACH(ds, &nfsrv_devidhead, nfsdev_list) {
                if (ds->nfsdev_nmp != NULL && ds->nfsdev_mdsisset != 0 &&
                    fsidcmp(&ds->nfsdev_mdsfsid, &mp->mnt_stat.f_fsid) == 0) {
                        if (++i > nfsrv_devidcnt)
                                break;
                        *tdvpp++ = ds->nfsdev_dvp;
                }
        }
        /*
         * If no matches for same file system, total all servers not assigned
         * to a file system.
         */
        if (i == 0) {
                TAILQ_FOREACH(ds, &nfsrv_devidhead, nfsdev_list) {
                        if (ds->nfsdev_nmp != NULL &&
                            ds->nfsdev_mdsisset == 0) {
                                if (++i > nfsrv_devidcnt)
                                        break;
                                *tdvpp++ = ds->nfsdev_dvp;
                        }
                }
        }
        NFSDDSUNLOCK();
        cnt = i;

        /* Do a VFS_STATFS() for each of the DSs and sum them up. */
        tdvpp = dvpp;
        for (i = 0; i < cnt && error == 0; i++) {
                dvp = *tdvpp++;
                error = VFS_STATFS(dvp->v_mount, tsf);
                if (error == 0) {
                        if (sf->f_bsize == 0) {
                                if (tsf->f_bsize > 0)
                                        sf->f_bsize = tsf->f_bsize;
                                else
                                        sf->f_bsize = 8192;
                        }
                        if (tsf->f_blocks > 0) {
                                if (sf->f_bsize != tsf->f_bsize) {
                                        tot = tsf->f_blocks * tsf->f_bsize;
                                        sf->f_blocks += (tot / sf->f_bsize);
                                } else
                                        sf->f_blocks += tsf->f_blocks;
                        }
                        if (tsf->f_bfree > 0) {
                                if (sf->f_bsize != tsf->f_bsize) {
                                        tot = tsf->f_bfree * tsf->f_bsize;
                                        sf->f_bfree += (tot / sf->f_bsize);
                                } else
                                        sf->f_bfree += tsf->f_bfree;
                        }
                        if (tsf->f_bavail > 0) {
                                if (sf->f_bsize != tsf->f_bsize) {
                                        tot = tsf->f_bavail * tsf->f_bsize;
                                        sf->f_bavail += (tot / sf->f_bsize);
                                } else
                                        sf->f_bavail += tsf->f_bavail;
                        }
                }
        }
        free(tsf, M_TEMP);
        free(dvpp, M_TEMP);
        return (error);
}

/*
 * Set an NFSv4 acl.
 */
int
nfsrv_setacl(struct vnode *vp, NFSACL_T *aclp, struct ucred *cred, NFSPROC_T *p)
{
        int error;

        if (nfsrv_useacl == 0 || nfs_supportsnfsv4acls(vp) == 0) {
                error = NFSERR_ATTRNOTSUPP;
                goto out;
        }
        /*
         * With NFSv4 ACLs, chmod(2) may need to add additional entries.
         * Make sure it has enough room for that - splitting every entry
         * into two and appending "canonical six" entries at the end.
         * Cribbed out of kern/vfs_acl.c - Rick M.
         */
        if (aclp->acl_cnt > (ACL_MAX_ENTRIES - 6) / 2) {
                error = NFSERR_ATTRNOTSUPP;
                goto out;
        }
        error = VOP_SETACL(vp, ACL_TYPE_NFS4, aclp, cred, p);
        if (error == 0) {
                error = nfsrv_dssetacl(vp, aclp, cred, p);
                if (error == ENOENT)
                        error = 0;
        }

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Seek vnode op call (actually it is a VOP_IOCTL()).
 * This function is called with the vnode locked, but unlocks and vrele()s
 * the vp before returning.
 */
int
nfsvno_seek(struct nfsrv_descript *nd, struct vnode *vp, u_long cmd,
    off_t *offp, int content, bool *eofp, struct ucred *cred, NFSPROC_T *p)
{
        struct nfsvattr at;
        int error, ret;

        ASSERT_VOP_LOCKED(vp, "nfsvno_seek vp");
        /*
         * Attempt to seek on a DS file. A return of ENOENT implies
         * there is no DS file to seek on.
         */
        error = nfsrv_proxyds(vp, 0, 0, cred, p, NFSPROC_SEEKDS, NULL,
            NULL, NULL, NULL, NULL, offp, content, eofp);
        if (error != ENOENT) {
                vput(vp);
                return (error);
        }

        /*
         * Do the VOP_IOCTL() call.  For the case where *offp == file_size,
         * VOP_IOCTL() will return ENXIO.  However, the correct reply for
         * NFSv4.2 is *eofp == true and error == 0 for this case.
         */
        NFSVOPUNLOCK(vp);
        error = VOP_IOCTL(vp, cmd, offp, 0, cred, p);
        *eofp = false;
        if (error == ENXIO || (error == 0 && cmd == FIOSEEKHOLE)) {
                /* Handle the cases where we might be at EOF. */
                ret = nfsvno_getattr(vp, &at, nd, p, 0, NULL);
                if (ret == 0 && *offp == at.na_size) {
                        *eofp = true;
                        error = 0;
                }
                if (ret != 0 && error == 0)
                        error = ret;
        }
        vrele(vp);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Allocate vnode op call.
 */
int
nfsvno_allocate(struct vnode *vp, off_t off, off_t len, struct ucred *cred,
    NFSPROC_T *p)
{
        int error;
        off_t olen;

        ASSERT_VOP_ELOCKED(vp, "nfsvno_allocate vp");
        /*
         * Attempt to allocate on a DS file. A return of ENOENT implies
         * there is no DS file to allocate on.
         */
        error = nfsrv_proxyds(vp, off, 0, cred, p, NFSPROC_ALLOCATE, NULL,
            NULL, NULL, NULL, NULL, &len, 0, NULL);
        if (error != ENOENT)
                return (error);

        /*
         * Do the actual VOP_ALLOCATE(), looping so long as
         * progress is being made, to achieve completion.
         */
        do {
                olen = len;
                error = VOP_ALLOCATE(vp, &off, &len);
                if (error == 0 && len > 0 && olen > len)
                        maybe_yield();
        } while (error == 0 && len > 0 && olen > len);
        if (error == 0 && len > 0)
                error = NFSERR_IO;
        NFSEXITCODE(error);
        return (error);
}

/*
 * Get Extended Atribute vnode op into an mbuf list.
 */
int
nfsvno_getxattr(struct vnode *vp, char *name, uint32_t maxresp,
    struct ucred *cred, uint64_t flag, int maxextsiz, struct thread *p,
    struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
{
        struct iovec *iv;
        struct uio io, *uiop = &io;
        struct mbuf *m, *m2;
        int alen, error, len, tlen;
        size_t siz;

        /* First, find out the size of the extended attribute. */
        error = VOP_GETEXTATTR(vp, EXTATTR_NAMESPACE_USER, name, NULL,
            &siz, cred, p);
        if (error != 0)
                return (NFSERR_NOXATTR);
        if (siz > maxresp - NFS_MAXXDR)
                return (NFSERR_XATTR2BIG);
        len = siz;
        tlen = NFSM_RNDUP(len);
        if (tlen > 0) {
                /*
                 * If cnt > MCLBYTES and the reply will not be saved, use
                 * ext_pgs mbufs for TLS.
                 * For NFSv4.0, we do not know for sure if the reply will
                 * be saved, so do not use ext_pgs mbufs for NFSv4.0.
                 * Always use ext_pgs mbufs if ND_EXTPG is set.
                 */
                if ((flag & ND_EXTPG) != 0 || (tlen > MCLBYTES &&
                    (flag & (ND_TLS | ND_SAVEREPLY)) == ND_TLS &&
                    (flag & (ND_NFSV4 | ND_NFSV41)) != ND_NFSV4))
                        uiop->uio_iovcnt = nfsrv_createiovec_extpgs(tlen,
                            maxextsiz, &m, &m2, &iv);
                else
                        uiop->uio_iovcnt = nfsrv_createiovec(tlen, &m, &m2,
                            &iv);
                uiop->uio_iov = iv;
        } else {
                uiop->uio_iovcnt = 0;
                uiop->uio_iov = iv = NULL;
                m = m2 = NULL;
        }
        uiop->uio_offset = 0;
        uiop->uio_resid = tlen;
        uiop->uio_rw = UIO_READ;
        uiop->uio_segflg = UIO_SYSSPACE;
        uiop->uio_td = p;
#ifdef MAC
        error = mac_vnode_check_getextattr(cred, vp, EXTATTR_NAMESPACE_USER,
            name);
        if (error != 0)
                goto out;
#endif

        if (tlen > 0)
                error = VOP_GETEXTATTR(vp, EXTATTR_NAMESPACE_USER, name, uiop,
                    NULL, cred, p);
        if (error != 0)
                goto out;
        if (uiop->uio_resid > 0) {
                alen = tlen;
                len = tlen - uiop->uio_resid;
                tlen = NFSM_RNDUP(len);
                if (alen != tlen)
                        printf("nfsvno_getxattr: weird size read\n");
                if (tlen == 0) {
                        m_freem(m);
                        m = m2 = NULL;
                } else if (alen != tlen || tlen != len)
                        m2 = nfsrv_adj(m, alen - tlen, tlen - len);
        }
        *lenp = len;
        *mpp = m;
        *mpendp = m2;

out:
        if (error != 0) {
                if (m != NULL)
                        m_freem(m);
                *lenp = 0;
        }
        free(iv, M_TEMP);
        NFSEXITCODE(error);
        return (error);
}

/*
 * Set Extended attribute vnode op from an mbuf list.
 */
int
nfsvno_setxattr(struct vnode *vp, char *name, int len, struct mbuf *m,
    char *cp, struct ucred *cred, struct thread *p)
{
        struct iovec *iv;
        struct uio uio, *uiop = &uio;
        int cnt, error;

        error = 0;
#ifdef MAC
        error = mac_vnode_check_setextattr(cred, vp, EXTATTR_NAMESPACE_USER,
            name);
#endif
        if (error != 0)
                goto out;

        uiop->uio_rw = UIO_WRITE;
        uiop->uio_segflg = UIO_SYSSPACE;
        uiop->uio_td = p;
        uiop->uio_offset = 0;
        uiop->uio_resid = len;
        if (len > 0) {
                error = nfsrv_createiovecw(len, m, cp, &iv, &cnt);
                uiop->uio_iov = iv;
                uiop->uio_iovcnt = cnt;
        } else {
                uiop->uio_iov = iv = NULL;
                uiop->uio_iovcnt = 0;
        }
        if (error == 0) {
                error = VOP_SETEXTATTR(vp, EXTATTR_NAMESPACE_USER, name, uiop,
                    cred, p);
                free(iv, M_TEMP);
        }

out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * Remove Extended attribute vnode op.
 */
int
nfsvno_rmxattr(struct nfsrv_descript *nd, struct vnode *vp, char *name,
    struct ucred *cred, struct thread *p)
{
        int error;

        /*
         * Get rid of any delegations.  I am not sure why this is required,
         * but RFC-8276 says so.
         */
        error = nfsrv_checkremove(vp, 0, nd, nd->nd_clientid, p);
        if (error != 0)
                goto out;
#ifdef MAC
        error = mac_vnode_check_deleteextattr(cred, vp, EXTATTR_NAMESPACE_USER,
            name);
        if (error != 0)
                goto out;
#endif

        error = VOP_DELETEEXTATTR(vp, EXTATTR_NAMESPACE_USER, name, cred, p);
        if (error == EOPNOTSUPP)
                error = VOP_SETEXTATTR(vp, EXTATTR_NAMESPACE_USER, name, NULL,
                    cred, p);
out:
        NFSEXITCODE(error);
        return (error);
}

/*
 * List Extended Atribute vnode op into an mbuf list.
 */
int
nfsvno_listxattr(struct vnode *vp, uint64_t cookie, struct ucred *cred,
    struct thread *p, u_char **bufp, uint32_t *lenp, bool *eofp)
{
        struct iovec iv;
        struct uio io;
        int error;
        size_t siz;

        *bufp = NULL;
        /* First, find out the size of the extended attribute. */
        error = VOP_LISTEXTATTR(vp, EXTATTR_NAMESPACE_USER, NULL, &siz, cred,
            p);
        if (error != 0)
                return (NFSERR_NOXATTR);
        if (siz <= cookie) {
                *lenp = 0;
                *eofp = true;
                goto out;
        }
        if (siz > cookie + *lenp) {
                siz = cookie + *lenp;
                *eofp = false;
        } else
                *eofp = true;
        /* Just choose a sanity limit of 10Mbytes for malloc(M_TEMP). */
        if (siz > 10 * 1024 * 1024) {
                error = NFSERR_XATTR2BIG;
                goto out;
        }
        *bufp = malloc(siz, M_TEMP, M_WAITOK);
        iv.iov_base = *bufp;
        iv.iov_len = siz;
        io.uio_iovcnt = 1;
        io.uio_iov = &iv;
        io.uio_offset = 0;
        io.uio_resid = siz;
        io.uio_rw = UIO_READ;
        io.uio_segflg = UIO_SYSSPACE;
        io.uio_td = p;
#ifdef MAC
        error = mac_vnode_check_listextattr(cred, vp, EXTATTR_NAMESPACE_USER);
        if (error != 0)
                goto out;
#endif

        error = VOP_LISTEXTATTR(vp, EXTATTR_NAMESPACE_USER, &io, NULL, cred,
            p);
        if (error != 0)
                goto out;
        if (io.uio_resid > 0)
                siz -= io.uio_resid;
        *lenp = siz;

out:
        if (error != 0) {
                free(*bufp, M_TEMP);
                *bufp = NULL;
        }
        NFSEXITCODE(error);
        return (error);
}

/*
 * Trim trailing data off the mbuf list being built.
 */
void
nfsm_trimtrailing(struct nfsrv_descript *nd, struct mbuf *mb, char *bpos,
    int bextpg, int bextpgsiz)
{
        vm_page_t pg;
        int fullpgsiz, i;

        if (mb->m_next != NULL) {
                m_freem(mb->m_next);
                mb->m_next = NULL;
        }
        if ((mb->m_flags & M_EXTPG) != 0) {
                KASSERT(bextpg >= 0 && bextpg < mb->m_epg_npgs,
                    ("nfsm_trimtrailing: bextpg out of range"));
                KASSERT(bpos == (char *)(void *)
                    PHYS_TO_DMAP(mb->m_epg_pa[bextpg]) + PAGE_SIZE - bextpgsiz,
                    ("nfsm_trimtrailing: bextpgsiz bad!"));

                /* First, get rid of any pages after this position. */
                for (i = mb->m_epg_npgs - 1; i > bextpg; i--) {
                        pg = PHYS_TO_VM_PAGE(mb->m_epg_pa[i]);
                        vm_page_unwire_noq(pg);
                        vm_page_free(pg);
                }
                mb->m_epg_npgs = bextpg + 1;
                if (bextpg == 0)
                        fullpgsiz = PAGE_SIZE - mb->m_epg_1st_off;
                else
                        fullpgsiz = PAGE_SIZE;
                mb->m_epg_last_len = fullpgsiz - bextpgsiz;
                mb->m_len = m_epg_pagelen(mb, 0, mb->m_epg_1st_off);
                for (i = 1; i < mb->m_epg_npgs; i++)
                        mb->m_len += m_epg_pagelen(mb, i, 0);
                nd->nd_bextpgsiz = bextpgsiz;
                nd->nd_bextpg = bextpg;
        } else
                mb->m_len = bpos - mtod(mb, char *);
        nd->nd_mb = mb;
        nd->nd_bpos = bpos;
}


/*
 * Check to see if a put file handle operation should test for
 * NFSERR_WRONGSEC, although NFSv3 actually returns NFSERR_AUTHERR.
 * When Open is the next operation, NFSERR_WRONGSEC cannot be
 * replied for the Open cases that use a component.  Thia can
 * be identified by the fact that the file handle's type is VDIR.
 */
bool
nfsrv_checkwrongsec(struct nfsrv_descript *nd, int nextop, enum vtype vtyp)
{

        if ((nd->nd_flag & ND_NFSV4) == 0) {
                if (nd->nd_procnum == NFSPROC_FSINFO)
                        return (false);
                return (true);
        }

        if ((nd->nd_flag & ND_LASTOP) != 0)
                return (false);

        if (nextop == NFSV4OP_PUTROOTFH || nextop == NFSV4OP_PUTFH ||
            nextop == NFSV4OP_PUTPUBFH || nextop == NFSV4OP_RESTOREFH ||
            nextop == NFSV4OP_LOOKUP || nextop == NFSV4OP_LOOKUPP ||
            nextop == NFSV4OP_SECINFO || nextop == NFSV4OP_SECINFONONAME)
                return (false);
        if (nextop == NFSV4OP_OPEN && vtyp == VDIR)
                return (false);
        return (true);
}

extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);

/*
 * Called once to initialize data structures...
 */
static int
nfsd_modevent(module_t mod, int type, void *data)
{
        int error = 0, i;
        static int loaded = 0;

        switch (type) {
        case MOD_LOAD:
                if (loaded)
                        goto out;
                newnfs_portinit();
                for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
                        mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
                            MTX_DEF);
                        mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
                            MTX_DEF);
                }
                mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
                mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
                mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
                mtx_init(&nfsrv_dontlistlock_mtx, "nfs4dnl", NULL, MTX_DEF);
                mtx_init(&nfsrv_recalllock_mtx, "nfs4rec", NULL, MTX_DEF);
                lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
                nfsrvd_initcache();
                nfsd_init();
                NFSD_LOCK();
                nfsrvd_init(0);
                NFSD_UNLOCK();
                nfsd_mntinit();
#ifdef VV_DISABLEDELEG
                vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
                vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
#endif
                nfsd_call_servertimer = nfsrv_servertimer;
                nfsd_call_nfsd = nfssvc_nfsd;
                loaded = 1;
                break;

        case MOD_UNLOAD:
                if (newnfs_numnfsd != 0) {
                        error = EBUSY;
                        break;
                }

#ifdef VV_DISABLEDELEG
                vn_deleg_ops.vndeleg_recall = NULL;
                vn_deleg_ops.vndeleg_disable = NULL;
#endif
                nfsd_call_servertimer = NULL;
                nfsd_call_nfsd = NULL;

                /* Clean out all NFSv4 state. */
                nfsrv_throwawayallstate(curthread);

                /* Clean the NFS server reply cache */
                nfsrvd_cleancache();

                /* Free up the krpc server pool. */
                if (nfsrvd_pool != NULL)
                        svcpool_destroy(nfsrvd_pool);

                /* and get rid of the locks */
                for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
                        mtx_destroy(&nfsrchash_table[i].mtx);
                        mtx_destroy(&nfsrcahash_table[i].mtx);
                }
                mtx_destroy(&nfsrc_udpmtx);
                mtx_destroy(&nfs_v4root_mutex);
                mtx_destroy(&nfsv4root_mnt.mnt_mtx);
                mtx_destroy(&nfsrv_dontlistlock_mtx);
                mtx_destroy(&nfsrv_recalllock_mtx);
                for (i = 0; i < nfsrv_sessionhashsize; i++)
                        mtx_destroy(&nfssessionhash[i].mtx);
                if (nfslayouthash != NULL) {
                        for (i = 0; i < nfsrv_layouthashsize; i++)
                                mtx_destroy(&nfslayouthash[i].mtx);
                        free(nfslayouthash, M_NFSDSESSION);
                }
                lockdestroy(&nfsv4root_mnt.mnt_explock);
                free(nfsclienthash, M_NFSDCLIENT);
                free(nfslockhash, M_NFSDLOCKFILE);
                free(nfssessionhash, M_NFSDSESSION);
                loaded = 0;
                break;
        default:
                error = EOPNOTSUPP;
                break;
        }

out:
        NFSEXITCODE(error);
        return (error);
}
static moduledata_t nfsd_mod = {
        "nfsd",
        nfsd_modevent,
        NULL,
};
DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);

/* So that loader and kldload(2) can find us, wherever we are.. */
MODULE_VERSION(nfsd, 1);
MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);