/*      $NetBSD: nfs_clcomsubs.c,v 1.4 2022/02/09 21:50:24 andvar Exp $ */
/*-
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
/* __FBSDID("FreeBSD: head/sys/fs/nfsclient/nfs_clcomsubs.c 304026 2016-08-12 22:44:59Z rmacklem "); */
__RCSID("$NetBSD: nfs_clcomsubs.c,v 1.4 2022/02/09 21:50:24 andvar Exp $");

/*
 * These functions support the macros and help fiddle mbuf chains for
 * the nfs op functions. They do things like create the rpc header and
 * copy data between mbuf chains and uio lists.
 */
#ifndef APPLEKEXT
#include <fs/nfs/common/nfsport.h>

extern struct nfsstatsv1 nfsstatsv1;
extern struct nfsv4_opflag nfsv4_opflag[NFSV41_NOPS];
extern int ncl_mbuf_mlen;
extern enum vtype newnv2tov_type[8];
extern enum vtype nv34tov_type[8];
extern int      nfs_bigreply[NFSV41_NPROCS];
NFSCLSTATEMUTEX;
#endif  /* !APPLEKEXT */

static nfsuint64 nfs_nullcookie = {{ 0, 0 }};
static struct {
        int     op;
        int     opcnt;
        const u_char *tag;
        int     taglen;
} nfsv4_opmap[NFSV41_NPROCS] = {
        { 0, 1, "Null", 4 },
        { NFSV4OP_GETATTR, 1, "Getattr", 7, },
        { NFSV4OP_SETATTR, 2, "Setattr", 7, },
        { NFSV4OP_LOOKUP, 3, "Lookup", 6, },
        { NFSV4OP_ACCESS, 2, "Access", 6, },
        { NFSV4OP_READLINK, 2, "Readlink", 8, },
        { NFSV4OP_READ, 1, "Read", 4, },
        { NFSV4OP_WRITE, 2, "Write", 5, },
        { NFSV4OP_OPEN, 5, "Open", 4, },
        { NFSV4OP_CREATE, 5, "Create", 6, },
        { NFSV4OP_CREATE, 1, "Create", 6, },
        { NFSV4OP_CREATE, 3, "Create", 6, },
        { NFSV4OP_REMOVE, 1, "Remove", 6, },
        { NFSV4OP_REMOVE, 1, "Remove", 6, },
        { NFSV4OP_SAVEFH, 5, "Rename", 6, },
        { NFSV4OP_SAVEFH, 4, "Link", 4, },
        { NFSV4OP_READDIR, 2, "Readdir", 7, },
        { NFSV4OP_READDIR, 2, "Readdir", 7, },
        { NFSV4OP_GETATTR, 1, "Getattr", 7, },
        { NFSV4OP_GETATTR, 1, "Getattr", 7, },
        { NFSV4OP_GETATTR, 1, "Getattr", 7, },
        { NFSV4OP_COMMIT, 2, "Commit", 6, },
        { NFSV4OP_LOOKUPP, 3, "Lookupp", 7, },
        { NFSV4OP_SETCLIENTID, 1, "SetClientID", 11, },
        { NFSV4OP_SETCLIENTIDCFRM, 1, "SetClientIDConfirm", 18, },
        { NFSV4OP_LOCK, 1, "Lock", 4, },
        { NFSV4OP_LOCKU, 1, "LockU", 5, },
        { NFSV4OP_OPEN, 2, "Open", 4, },
        { NFSV4OP_CLOSE, 1, "Close", 5, },
        { NFSV4OP_OPENCONFIRM, 1, "Openconfirm", 11, },
        { NFSV4OP_LOCKT, 1, "LockT", 5, },
        { NFSV4OP_OPENDOWNGRADE, 1, "Opendowngrade", 13, },
        { NFSV4OP_RENEW, 1, "Renew", 5, },
        { NFSV4OP_PUTROOTFH, 1, "Dirpath", 7, },
        { NFSV4OP_RELEASELCKOWN, 1, "Rellckown", 9, },
        { NFSV4OP_DELEGRETURN, 1, "Delegret", 8, },
        { NFSV4OP_DELEGRETURN, 3, "DelegRemove", 11, },
        { NFSV4OP_DELEGRETURN, 7, "DelegRename1", 12, },
        { NFSV4OP_DELEGRETURN, 9, "DelegRename2", 12, },
        { NFSV4OP_GETATTR, 1, "Getacl", 6, },
        { NFSV4OP_SETATTR, 1, "Setacl", 6, },
        { NFSV4OP_EXCHANGEID, 1, "ExchangeID", 10, },
        { NFSV4OP_CREATESESSION, 1, "CreateSession", 13, },
        { NFSV4OP_DESTROYSESSION, 1, "DestroySession", 14, },
        { NFSV4OP_DESTROYCLIENTID, 1, "DestroyClient", 13, },
        { NFSV4OP_FREESTATEID, 1, "FreeStateID", 11, },
        { NFSV4OP_LAYOUTGET, 1, "LayoutGet", 9, },
        { NFSV4OP_GETDEVINFO, 1, "GetDeviceInfo", 13, },
        { NFSV4OP_LAYOUTCOMMIT, 1, "LayoutCommit", 12, },
        { NFSV4OP_LAYOUTRETURN, 1, "LayoutReturn", 12, },
        { NFSV4OP_RECLAIMCOMPL, 1, "ReclaimComplete", 15, },
        { NFSV4OP_WRITE, 1, "WriteDS", 7, },
        { NFSV4OP_READ, 1, "ReadDS", 6, },
        { NFSV4OP_COMMIT, 1, "CommitDS", 8, },
};

/*
 * NFS RPCS that have large request message size.
 */
static int nfs_bigrequest[NFSV41_NPROCS] = {
        0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 1, 0, 0
};

/*
 * Start building a request. Mostly just put the first file handle in
 * place.
 */
APPLESTATIC void
nfscl_reqstart(struct nfsrv_descript *nd, int procnum, struct nfsmount *nmp,
    u_int8_t *nfhp, int fhlen, u_int32_t **opcntpp, struct nfsclsession *sep)
{
        struct mbuf *mb;
        u_int32_t *tl;
        int opcnt;
        nfsattrbit_t attrbits;

        /*
         * First, fill in some of the fields of nd.
         */
        nd->nd_slotseq = NULL;
        if (NFSHASNFSV4(nmp)) {
                nd->nd_flag = ND_NFSV4 | ND_NFSCL;
                if (NFSHASNFSV4N(nmp))
                        nd->nd_flag |= ND_NFSV41;
        } else if (NFSHASNFSV3(nmp))
                nd->nd_flag = ND_NFSV3 | ND_NFSCL;
        else
                nd->nd_flag = ND_NFSV2 | ND_NFSCL;
        nd->nd_procnum = procnum;
        nd->nd_repstat = 0;

        /*
         * Get the first mbuf for the request.
         */
        if (nfs_bigrequest[procnum])
                NFSMCLGET(mb, M_WAITOK);
        else
                NFSMGET(mb);
        mbuf_setlen(mb, 0);
        nd->nd_mreq = nd->nd_mb = mb;
        nd->nd_bpos = NFSMTOD(mb, caddr_t);
        
        /*
         * And fill the first file handle into the request.
         */
        if (nd->nd_flag & ND_NFSV4) {
                opcnt = nfsv4_opmap[procnum].opcnt +
                    nfsv4_opflag[nfsv4_opmap[procnum].op].needscfh;
                if ((nd->nd_flag & ND_NFSV41) != 0) {
                        opcnt += nfsv4_opflag[nfsv4_opmap[procnum].op].needsseq;
                        if (procnum == NFSPROC_RENEW)
                                /*
                                 * For the special case of Renew, just do a
                                 * Sequence Op.
                                 */
                                opcnt = 1;
                        else if (procnum == NFSPROC_WRITEDS ||
                            procnum == NFSPROC_COMMITDS)
                                /*
                                 * For the special case of a Writeor Commit to
                                 * a DS, the opcnt == 3, for Sequence, PutFH,
                                 * Write/Commit.
                                 */
                                opcnt = 3;
                }
                /*
                 * What should the tag really be?
                 */
                (void) nfsm_strtom(nd, nfsv4_opmap[procnum].tag,
                        nfsv4_opmap[procnum].taglen);
                NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
                if ((nd->nd_flag & ND_NFSV41) != 0)
                        *tl++ = txdr_unsigned(NFSV41_MINORVERSION);
                else
                        *tl++ = txdr_unsigned(NFSV4_MINORVERSION);
                if (opcntpp != NULL)
                        *opcntpp = tl;
                *tl = txdr_unsigned(opcnt);
                if ((nd->nd_flag & ND_NFSV41) != 0 &&
                    nfsv4_opflag[nfsv4_opmap[procnum].op].needsseq > 0) {
                        NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
                        *tl = txdr_unsigned(NFSV4OP_SEQUENCE);
                        if (sep == NULL)
                                nfsv4_setsequence(nmp, nd,
                                    NFSMNT_MDSSESSION(nmp),
                                    nfs_bigreply[procnum]);
                        else
                                nfsv4_setsequence(nmp, nd, sep,
                                    nfs_bigreply[procnum]);
                }
                if (nfsv4_opflag[nfsv4_opmap[procnum].op].needscfh > 0) {
                        NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
                        *tl = txdr_unsigned(NFSV4OP_PUTFH);
                        (void) nfsm_fhtom(nd, nfhp, fhlen, 0);
                        if (nfsv4_opflag[nfsv4_opmap[procnum].op].needscfh
                            == 2 && procnum != NFSPROC_WRITEDS &&
                            procnum != NFSPROC_COMMITDS) {
                                NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
                                *tl = txdr_unsigned(NFSV4OP_GETATTR);
                                /*
                                 * For Lookup Ops, we want all the directory
                                 * attributes, so we can load the name cache.
                                 */
                                if (procnum == NFSPROC_LOOKUP ||
                                    procnum == NFSPROC_LOOKUPP)
                                        NFSGETATTR_ATTRBIT(&attrbits);
                                else {
                                        NFSWCCATTR_ATTRBIT(&attrbits);
                                        nd->nd_flag |= ND_V4WCCATTR;
                                }
                                (void) nfsrv_putattrbit(nd, &attrbits);
                        }
                }
                if (procnum != NFSPROC_RENEW ||
                    (nd->nd_flag & ND_NFSV41) == 0) {
                        NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
                        *tl = txdr_unsigned(nfsv4_opmap[procnum].op);
                }
        } else {
                (void) nfsm_fhtom(nd, nfhp, fhlen, 0);
        }
        if (procnum < NFSV41_NPROCS)
                NFSINCRGLOBAL(nfsstatsv1.rpccnt[procnum]);
}

#ifndef APPLE
/*
 * copies a uio scatter/gather list to an mbuf chain.
 * NOTE: can only handle iovcnt == 1
 */
APPLESTATIC void
nfsm_uiombuf(struct nfsrv_descript *nd, struct uio *uiop, int siz)
{
        char *uiocp;
        struct mbuf *mp, *mp2;
        int xfer, left, mlen;
        int uiosiz, clflg, rem;
        char *cp, *tcp;

        KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));

        if (siz > ncl_mbuf_mlen)        /* or should it >= MCLBYTES ?? */
                clflg = 1;
        else
                clflg = 0;
        rem = NFSM_RNDUP(siz) - siz;
        mp = mp2 = nd->nd_mb;
        while (siz > 0) {
                left = uiop->uio_iov->iov_len;
                uiocp = uiop->uio_iov->iov_base;
                if (left > siz)
                        left = siz;
                uiosiz = left;
                while (left > 0) {
                        mlen = M_TRAILINGSPACE(mp);
                        if (mlen == 0) {
                                if (clflg)
                                        NFSMCLGET(mp, M_WAITOK);
                                else
                                        NFSMGET(mp);
                                mbuf_setlen(mp, 0);
                                mbuf_setnext(mp2, mp);
                                mp2 = mp;
                                mlen = M_TRAILINGSPACE(mp);
                        }
                        xfer = (left > mlen) ? mlen : left;
#ifdef notdef
                        /* Not Yet.. */
                        if (uiop->uio_iov->iov_op != NULL)
                                (*(uiop->uio_iov->iov_op))
                                (uiocp, NFSMTOD(mp, caddr_t) + mbuf_len(mp),
                                    xfer);
                        else
#endif
                        if (uiop->uio_segflg == UIO_SYSSPACE)
                            NFSBCOPY(uiocp, NFSMTOD(mp, caddr_t) + mbuf_len(mp),
                                xfer);
                        else
                            copyin(CAST_USER_ADDR_T(uiocp), NFSMTOD(mp, caddr_t)
                                + mbuf_len(mp), xfer);
                        mbuf_setlen(mp, mbuf_len(mp) + xfer);
                        left -= xfer;
                        uiocp += xfer;
                        uiop->uio_offset += xfer;
                        uiop->uio_resid -= xfer;
                }
                tcp = (char *)uiop->uio_iov->iov_base;
                tcp += uiosiz;
                uiop->uio_iov->iov_base = (void *)tcp;
                uiop->uio_iov->iov_len -= uiosiz;
                siz -= uiosiz;
        }
        if (rem > 0) {
                if (rem > M_TRAILINGSPACE(mp)) {
                        NFSMGET(mp);
                        mbuf_setlen(mp, 0);
                        mbuf_setnext(mp2, mp);
                }
                cp = NFSMTOD(mp, caddr_t) + mbuf_len(mp);
                for (left = 0; left < rem; left++)
                        *cp++ = '\0';
                mbuf_setlen(mp, mbuf_len(mp) + rem);
                nd->nd_bpos = cp;
        } else
                nd->nd_bpos = NFSMTOD(mp, caddr_t) + mbuf_len(mp);
        nd->nd_mb = mp;
}
#endif  /* !APPLE */

/*
 * Load vnode attributes from the xdr file attributes.
 * Returns EBADRPC if they can't be parsed, 0 otherwise.
 */
APPLESTATIC int
nfsm_loadattr(struct nfsrv_descript *nd, struct nfsvattr *nap)
{
        struct nfs_fattr *fp;
        int error = 0;

        if (nd->nd_flag & ND_NFSV4) {
                error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL,
                    NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
        } else if (nd->nd_flag & ND_NFSV3) {
                NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V3FATTR);
                nap->na_type = nfsv34tov_type(fp->fa_type);
                nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode);
                nap->na_rdev = makedev(fxdr_unsigned(u_char, fp->fa3_rdev.specdata1),
                        fxdr_unsigned(u_char, fp->fa3_rdev.specdata2));
                nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
                nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid);
                nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid);
                nap->na_size = fxdr_hyper(&fp->fa3_size);
                nap->na_blocksize = NFS_FABLKSIZE;
                nap->na_bytes = fxdr_hyper(&fp->fa3_used);
                nap->na_fileid = fxdr_hyper(&fp->fa3_fileid);
                fxdr_nfsv3time(&fp->fa3_atime, &nap->na_atime);
                fxdr_nfsv3time(&fp->fa3_ctime, &nap->na_ctime);
                fxdr_nfsv3time(&fp->fa3_mtime, &nap->na_mtime);
                nap->na_flags = 0;
                nap->na_filerev = 0;
        } else {
                NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V2FATTR);
                nap->na_type = nfsv2tov_type(fp->fa_type);
                nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode);
                if (nap->na_type == VNON || nap->na_type == VREG)
                        nap->na_type = IFTOVT(nap->na_mode);
                nap->na_rdev = fxdr_unsigned(dev_t, fp->fa2_rdev);

                /*
                 * Really ugly NFSv2 kludge.
                 */
                if (nap->na_type == VCHR && nap->na_rdev == ((dev_t)-1))
                        nap->na_type = VFIFO;
                nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
                nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid);
                nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid);
                nap->na_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
                nap->na_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
                nap->na_bytes =
                    (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) *
                    NFS_FABLKSIZE;
                nap->na_fileid = fxdr_unsigned(uint64_t, fp->fa2_fileid);
                fxdr_nfsv2time(&fp->fa2_atime, &nap->na_atime);
                fxdr_nfsv2time(&fp->fa2_mtime, &nap->na_mtime);
                nap->na_flags = 0;
                nap->na_ctime.tv_sec = fxdr_unsigned(u_int32_t,
                    fp->fa2_ctime.nfsv2_sec);
                nap->na_ctime.tv_nsec = 0;
                nap->na_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
                nap->na_filerev = 0;
        }
nfsmout:
        return (error);
}

/*
 * This function finds the directory cookie that corresponds to the
 * logical byte offset given.
 */
APPLESTATIC nfsuint64 *
nfscl_getcookie(struct nfsnode *np, off_t off, int add)
{
        struct nfsdmap *dp, *dp2;
        int pos;

        pos = off / NFS_DIRBLKSIZ;
        if (pos == 0) {
                KASSERT(!add, ("nfs getcookie add at 0"));
                return (&nfs_nullcookie);
        }
        pos--;
        dp = LIST_FIRST(&np->n_cookies);
        if (!dp) {
                if (add) {
                        MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
                                M_NFSDIROFF, M_WAITOK);
                        dp->ndm_eocookie = 0;
                        LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
                } else
                        return (NULL);
        }
        while (pos >= NFSNUMCOOKIES) {
                pos -= NFSNUMCOOKIES;
                if (LIST_NEXT(dp, ndm_list) != NULL) {
                        if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
                                pos >= dp->ndm_eocookie)
                                return (NULL);
                        dp = LIST_NEXT(dp, ndm_list);
                } else if (add) {
                        MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
                                M_NFSDIROFF, M_WAITOK);
                        dp2->ndm_eocookie = 0;
                        LIST_INSERT_AFTER(dp, dp2, ndm_list);
                        dp = dp2;
                } else
                        return (NULL);
        }
        if (pos >= dp->ndm_eocookie) {
                if (add)
                        dp->ndm_eocookie = pos + 1;
                else
                        return (NULL);
        }
        return (&dp->ndm_cookies[pos]);
}

/*
 * Gets a file handle out of an nfs reply sent to the client and returns
 * the file handle and the file's attributes.
 * For V4, it assumes that Getfh and Getattr Op's results are here.
 */
APPLESTATIC int
nfscl_mtofh(struct nfsrv_descript *nd, struct nfsfh **nfhpp,
    struct nfsvattr *nap, int *attrflagp)
{
        u_int32_t *tl;
        int error = 0, flag = 1;

        *nfhpp = NULL;
        *attrflagp = 0;
        /*
         * First get the file handle and vnode.
         */
        if (nd->nd_flag & ND_NFSV3) {
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                flag = fxdr_unsigned(int, *tl);
        } else if (nd->nd_flag & ND_NFSV4) {
                NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
        }
        if (flag) {
                error = nfsm_getfh(nd, nfhpp);
                if (error)
                        return (error);
        }

        /*
         * Now, get the attributes.
         */
        if (nd->nd_flag & ND_NFSV4) {
                NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
        } else if (nd->nd_flag & ND_NFSV3) {
                NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
                if (flag) {
                        flag = fxdr_unsigned(int, *tl);
                } else if (fxdr_unsigned(int, *tl)) {
                        error = nfsm_advance(nd, NFSX_V3FATTR, -1);
                        if (error)
                                return (error);
                }
        }
        if (flag) {
                error = nfsm_loadattr(nd, nap);
                if (!error)
                        *attrflagp = 1;
        }
nfsmout:
        return (error);
}

/*
 * Put a state Id in the mbuf list.
 */
APPLESTATIC void
nfsm_stateidtom(struct nfsrv_descript *nd, nfsv4stateid_t *stateidp, int flag)
{
        nfsv4stateid_t *st;

        NFSM_BUILD(st, nfsv4stateid_t *, NFSX_STATEID);
        if (flag == NFSSTATEID_PUTALLZERO) {
                st->seqid = 0;
                st->other[0] = 0;
                st->other[1] = 0;
                st->other[2] = 0;
        } else if (flag == NFSSTATEID_PUTALLONE) {
                st->seqid = 0xffffffff;
                st->other[0] = 0xffffffff;
                st->other[1] = 0xffffffff;
                st->other[2] = 0xffffffff;
        } else if (flag == NFSSTATEID_PUTSEQIDZERO) {
                st->seqid = 0;
                st->other[0] = stateidp->other[0];
                st->other[1] = stateidp->other[1];
                st->other[2] = stateidp->other[2];
        } else {
                st->seqid = stateidp->seqid;
                st->other[0] = stateidp->other[0];
                st->other[1] = stateidp->other[1];
                st->other[2] = stateidp->other[2];
        }
}

/*
 * Initialize the owner/delegation sleep lock.
 */
APPLESTATIC void
nfscl_lockinit(struct nfsv4lock *lckp)
{

        lckp->nfslock_usecnt = 0;
        lckp->nfslock_lock = 0;
}

/*
 * Get an exclusive lock. (Not needed for OpenBSD4, since there is only one
 * thread for each posix process in the kernel.)
 */
APPLESTATIC void
nfscl_lockexcl(struct nfsv4lock *lckp, void *mutex)
{
        int igotlock;

        do {
                igotlock = nfsv4_lock(lckp, 1, NULL, mutex, NULL);
        } while (!igotlock);
}

/*
 * Release an exclusive lock.
 */
APPLESTATIC void
nfscl_lockunlock(struct nfsv4lock *lckp)
{

        nfsv4_unlock(lckp, 0);
}

/*
 * Called to dereference a lock on a stateid (delegation or open owner).
 */
APPLESTATIC void
nfscl_lockderef(struct nfsv4lock *lckp)
{

        NFSLOCKCLSTATE();
        lckp->nfslock_usecnt--;
        if (lckp->nfslock_usecnt == 0 && (lckp->nfslock_lock & NFSV4LOCK_WANTED)) {
                lckp->nfslock_lock &= ~NFSV4LOCK_WANTED;
                wakeup((caddr_t)lckp);
        }
        NFSUNLOCKCLSTATE();
}