The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/nfs_subs.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)nfs_subs.c  8.8 (Berkeley) 5/22/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.0/sys/nfsclient/nfs_subs.c 196209 2009-08-14 11:17:34Z kib $");
   37 
   38 /*
   39  * These functions support the macros and help fiddle mbuf chains for
   40  * the nfs op functions. They do things like create the rpc header and
   41  * copy data between mbuf chains and uio lists.
   42  */
   43 
   44 #include "opt_kdtrace.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/kernel.h>
   49 #include <sys/bio.h>
   50 #include <sys/buf.h>
   51 #include <sys/proc.h>
   52 #include <sys/mount.h>
   53 #include <sys/vnode.h>
   54 #include <sys/namei.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/socket.h>
   57 #include <sys/stat.h>
   58 #include <sys/malloc.h>
   59 #include <sys/sysent.h>
   60 #include <sys/syscall.h>
   61 #include <sys/sysproto.h>
   62 
   63 #include <vm/vm.h>
   64 #include <vm/vm_object.h>
   65 #include <vm/vm_extern.h>
   66 #include <vm/uma.h>
   67 
   68 #include <nfs/nfsproto.h>
   69 #include <nfsclient/nfs.h>
   70 #include <nfsclient/nfsnode.h>
   71 #include <nfsclient/nfs_kdtrace.h>
   72 #include <nfs/xdr_subs.h>
   73 #include <nfsclient/nfsm_subs.h>
   74 #include <nfsclient/nfsmount.h>
   75 
   76 #include <netinet/in.h>
   77 
   78 /*
   79  * Note that stdarg.h and the ANSI style va_start macro is used for both
   80  * ANSI and traditional C compilers.
   81  */
   82 #include <machine/stdarg.h>
   83 
   84 #ifdef KDTRACE_HOOKS
   85 dtrace_nfsclient_attrcache_flush_probe_func_t
   86     dtrace_nfsclient_attrcache_flush_done_probe;
   87 uint32_t nfsclient_attrcache_flush_done_id;
   88 
   89 dtrace_nfsclient_attrcache_get_hit_probe_func_t
   90     dtrace_nfsclient_attrcache_get_hit_probe;
   91 uint32_t nfsclient_attrcache_get_hit_id;
   92 
   93 dtrace_nfsclient_attrcache_get_miss_probe_func_t
   94     dtrace_nfsclient_attrcache_get_miss_probe;
   95 uint32_t nfsclient_attrcache_get_miss_id;
   96 
   97 dtrace_nfsclient_attrcache_load_probe_func_t
   98     dtrace_nfsclient_attrcache_load_done_probe;
   99 uint32_t nfsclient_attrcache_load_done_id;
  100 #endif /* !KDTRACE_HOOKS */
  101 
  102 /*
  103  * Data items converted to xdr at startup, since they are constant
  104  * This is kinda hokey, but may save a little time doing byte swaps
  105  */
  106 u_int32_t       nfs_xdrneg1;
  107 u_int32_t       nfs_true, nfs_false;
  108 
  109 /* And other global data */
  110 static u_int32_t nfs_xid = 0;
  111 static enum vtype nv2tov_type[8]= {
  112         VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON,  VNON
  113 };
  114 
  115 int             nfs_ticks;
  116 int             nfs_pbuf_freecnt = -1;  /* start out unlimited */
  117 
  118 struct nfs_bufq nfs_bufq;
  119 static struct mtx nfs_xid_mtx;
  120 
  121 /*
  122  * and the reverse mapping from generic to Version 2 procedure numbers
  123  */
  124 int nfsv2_procid[NFS_NPROCS] = {
  125         NFSV2PROC_NULL,
  126         NFSV2PROC_GETATTR,
  127         NFSV2PROC_SETATTR,
  128         NFSV2PROC_LOOKUP,
  129         NFSV2PROC_NOOP,
  130         NFSV2PROC_READLINK,
  131         NFSV2PROC_READ,
  132         NFSV2PROC_WRITE,
  133         NFSV2PROC_CREATE,
  134         NFSV2PROC_MKDIR,
  135         NFSV2PROC_SYMLINK,
  136         NFSV2PROC_CREATE,
  137         NFSV2PROC_REMOVE,
  138         NFSV2PROC_RMDIR,
  139         NFSV2PROC_RENAME,
  140         NFSV2PROC_LINK,
  141         NFSV2PROC_READDIR,
  142         NFSV2PROC_NOOP,
  143         NFSV2PROC_STATFS,
  144         NFSV2PROC_NOOP,
  145         NFSV2PROC_NOOP,
  146         NFSV2PROC_NOOP,
  147         NFSV2PROC_NOOP,
  148 };
  149 
  150 LIST_HEAD(nfsnodehashhead, nfsnode);
  151 
  152 u_int32_t
  153 nfs_xid_gen(void)
  154 {
  155         uint32_t xid;
  156 
  157         mtx_lock(&nfs_xid_mtx);
  158 
  159         /* Get a pretty random xid to start with */
  160         if (!nfs_xid)
  161                 nfs_xid = random();
  162         /*
  163          * Skip zero xid if it should ever happen.
  164          */
  165         if (++nfs_xid == 0)
  166                 nfs_xid++;
  167         xid = nfs_xid;
  168         mtx_unlock(&nfs_xid_mtx);
  169         return xid;
  170 }
  171 
  172 /*
  173  * Create the header for an rpc request packet
  174  * The hsiz is the size of the rest of the nfs request header.
  175  * (just used to decide if a cluster is a good idea)
  176  */
  177 struct mbuf *
  178 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
  179 {
  180         struct mbuf *mb;
  181 
  182         MGET(mb, M_WAIT, MT_DATA);
  183         if (hsiz >= MINCLSIZE)
  184                 MCLGET(mb, M_WAIT);
  185         mb->m_len = 0;
  186         return (mb);
  187 }
  188 
  189 /*
  190  * copies a uio scatter/gather list to an mbuf chain.
  191  * NOTE: can ony handle iovcnt == 1
  192  */
  193 int
  194 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
  195 {
  196         char *uiocp;
  197         struct mbuf *mp, *mp2;
  198         int xfer, left, mlen;
  199         int uiosiz, clflg, rem;
  200         char *cp;
  201 
  202 #ifdef DIAGNOSTIC
  203         if (uiop->uio_iovcnt != 1)
  204                 panic("nfsm_uiotombuf: iovcnt != 1");
  205 #endif
  206 
  207         if (siz > MLEN)         /* or should it >= MCLBYTES ?? */
  208                 clflg = 1;
  209         else
  210                 clflg = 0;
  211         rem = nfsm_rndup(siz)-siz;
  212         mp = mp2 = *mq;
  213         while (siz > 0) {
  214                 left = uiop->uio_iov->iov_len;
  215                 uiocp = uiop->uio_iov->iov_base;
  216                 if (left > siz)
  217                         left = siz;
  218                 uiosiz = left;
  219                 while (left > 0) {
  220                         mlen = M_TRAILINGSPACE(mp);
  221                         if (mlen == 0) {
  222                                 MGET(mp, M_WAIT, MT_DATA);
  223                                 if (clflg)
  224                                         MCLGET(mp, M_WAIT);
  225                                 mp->m_len = 0;
  226                                 mp2->m_next = mp;
  227                                 mp2 = mp;
  228                                 mlen = M_TRAILINGSPACE(mp);
  229                         }
  230                         xfer = (left > mlen) ? mlen : left;
  231 #ifdef notdef
  232                         /* Not Yet.. */
  233                         if (uiop->uio_iov->iov_op != NULL)
  234                                 (*(uiop->uio_iov->iov_op))
  235                                 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  236                         else
  237 #endif
  238                         if (uiop->uio_segflg == UIO_SYSSPACE)
  239                                 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  240                         else
  241                                 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  242                         mp->m_len += xfer;
  243                         left -= xfer;
  244                         uiocp += xfer;
  245                         uiop->uio_offset += xfer;
  246                         uiop->uio_resid -= xfer;
  247                 }
  248                 uiop->uio_iov->iov_base =
  249                     (char *)uiop->uio_iov->iov_base + uiosiz;
  250                 uiop->uio_iov->iov_len -= uiosiz;
  251                 siz -= uiosiz;
  252         }
  253         if (rem > 0) {
  254                 if (rem > M_TRAILINGSPACE(mp)) {
  255                         MGET(mp, M_WAIT, MT_DATA);
  256                         mp->m_len = 0;
  257                         mp2->m_next = mp;
  258                 }
  259                 cp = mtod(mp, caddr_t)+mp->m_len;
  260                 for (left = 0; left < rem; left++)
  261                         *cp++ = '\0';
  262                 mp->m_len += rem;
  263                 *bpos = cp;
  264         } else
  265                 *bpos = mtod(mp, caddr_t)+mp->m_len;
  266         *mq = mp;
  267         return (0);
  268 }
  269 
  270 /*
  271  * Copy a string into mbufs for the hard cases...
  272  */
  273 int
  274 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
  275 {
  276         struct mbuf *m1 = NULL, *m2;
  277         long left, xfer, len, tlen;
  278         u_int32_t *tl;
  279         int putsize;
  280 
  281         putsize = 1;
  282         m2 = *mb;
  283         left = M_TRAILINGSPACE(m2);
  284         if (left > 0) {
  285                 tl = ((u_int32_t *)(*bpos));
  286                 *tl++ = txdr_unsigned(siz);
  287                 putsize = 0;
  288                 left -= NFSX_UNSIGNED;
  289                 m2->m_len += NFSX_UNSIGNED;
  290                 if (left > 0) {
  291                         bcopy(cp, (caddr_t) tl, left);
  292                         siz -= left;
  293                         cp += left;
  294                         m2->m_len += left;
  295                         left = 0;
  296                 }
  297         }
  298         /* Loop around adding mbufs */
  299         while (siz > 0) {
  300                 MGET(m1, M_WAIT, MT_DATA);
  301                 if (siz > MLEN)
  302                         MCLGET(m1, M_WAIT);
  303                 m1->m_len = NFSMSIZ(m1);
  304                 m2->m_next = m1;
  305                 m2 = m1;
  306                 tl = mtod(m1, u_int32_t *);
  307                 tlen = 0;
  308                 if (putsize) {
  309                         *tl++ = txdr_unsigned(siz);
  310                         m1->m_len -= NFSX_UNSIGNED;
  311                         tlen = NFSX_UNSIGNED;
  312                         putsize = 0;
  313                 }
  314                 if (siz < m1->m_len) {
  315                         len = nfsm_rndup(siz);
  316                         xfer = siz;
  317                         if (xfer < len)
  318                                 *(tl+(xfer>>2)) = 0;
  319                 } else {
  320                         xfer = len = m1->m_len;
  321                 }
  322                 bcopy(cp, (caddr_t) tl, xfer);
  323                 m1->m_len = len+tlen;
  324                 siz -= xfer;
  325                 cp += xfer;
  326         }
  327         *mb = m1;
  328         *bpos = mtod(m1, caddr_t)+m1->m_len;
  329         return (0);
  330 }
  331 
  332 /*
  333  * Called once to initialize data structures...
  334  */
  335 int
  336 nfs_init(struct vfsconf *vfsp)
  337 {
  338         int i;
  339 
  340         nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
  341             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
  342         nfs_true = txdr_unsigned(TRUE);
  343         nfs_false = txdr_unsigned(FALSE);
  344         nfs_xdrneg1 = txdr_unsigned(-1);
  345         nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
  346         if (nfs_ticks < 1)
  347                 nfs_ticks = 1;
  348         /* Ensure async daemons disabled */
  349         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  350                 nfs_iodwant[i] = NULL;
  351                 nfs_iodmount[i] = NULL;
  352         }
  353         nfs_nhinit();                   /* Init the nfsnode table */
  354 
  355         /*
  356          * Initialize reply list and start timer
  357          */
  358         mtx_init(&nfs_iod_mtx, "NFS iod lock", NULL, MTX_DEF);
  359         mtx_init(&nfs_xid_mtx, "NFS xid lock", NULL, MTX_DEF);
  360 
  361         nfs_pbuf_freecnt = nswbuf / 2 + 1;
  362 
  363         return (0);
  364 }
  365 
  366 int
  367 nfs_uninit(struct vfsconf *vfsp)
  368 {
  369         int i;
  370 
  371         /*
  372          * Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup
  373          * any sleeping nfsiods so they check nfs_iodmax and exit.
  374          */
  375         mtx_lock(&nfs_iod_mtx);
  376         nfs_iodmax = 0;
  377         for (i = 0; i < nfs_numasync; i++)
  378                 if (nfs_iodwant[i])
  379                         wakeup(&nfs_iodwant[i]);
  380         /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */
  381         while (nfs_numasync)
  382                 msleep(&nfs_numasync, &nfs_iod_mtx, PWAIT, "ioddie", 0);
  383         mtx_unlock(&nfs_iod_mtx);
  384         nfs_nhuninit();
  385         uma_zdestroy(nfsmount_zone);
  386         return (0);
  387 }
  388 
  389 void 
  390 nfs_dircookie_lock(struct nfsnode *np)
  391 {
  392         mtx_lock(&np->n_mtx);
  393         while (np->n_flag & NDIRCOOKIELK)
  394                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  395         np->n_flag |= NDIRCOOKIELK;
  396         mtx_unlock(&np->n_mtx);
  397 }
  398 
  399 void 
  400 nfs_dircookie_unlock(struct nfsnode *np)
  401 {
  402         mtx_lock(&np->n_mtx);
  403         np->n_flag &= ~NDIRCOOKIELK;
  404         wakeup(&np->n_flag);
  405         mtx_unlock(&np->n_mtx);
  406 }
  407 
  408 int
  409 nfs_upgrade_vnlock(struct vnode *vp)
  410 {
  411         int old_lock;
  412 
  413         ASSERT_VOP_LOCKED(vp, "nfs_upgrade_vnlock");
  414         old_lock = VOP_ISLOCKED(vp);
  415         if (old_lock != LK_EXCLUSIVE) {
  416                 KASSERT(old_lock == LK_SHARED,
  417                     ("nfs_upgrade_vnlock: wrong old_lock %d", old_lock));
  418                 /* Upgrade to exclusive lock, this might block */
  419                 vn_lock(vp, LK_UPGRADE | LK_RETRY);
  420         }
  421         return (old_lock);
  422 }
  423 
  424 void
  425 nfs_downgrade_vnlock(struct vnode *vp, int old_lock)
  426 {
  427         if (old_lock != LK_EXCLUSIVE) {
  428                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  429                 /* Downgrade from exclusive lock. */
  430                 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  431         }
  432 }
  433 
  434 void
  435 nfs_printf(const char *fmt, ...)
  436 {
  437         va_list ap;
  438 
  439         mtx_lock(&Giant);
  440         va_start(ap, fmt);
  441         printf(fmt, ap);
  442         va_end(ap);
  443         mtx_unlock(&Giant);
  444 }
  445 
  446 /*
  447  * Attribute cache routines.
  448  * nfs_loadattrcache() - loads or updates the cache contents from attributes
  449  *      that are on the mbuf list
  450  * nfs_getattrcache() - returns valid attributes if found in cache, returns
  451  *      error otherwise
  452  */
  453 
  454 /*
  455  * Load the attribute cache (that lives in the nfsnode entry) with
  456  * the values on the mbuf list and
  457  * Iff vap not NULL
  458  *    copy the attributes to *vaper
  459  */
  460 int
  461 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
  462                   struct vattr *vaper, int dontshrink)
  463 {
  464         struct vnode *vp = *vpp;
  465         struct vattr *vap;
  466         struct nfs_fattr *fp;
  467         struct nfsnode *np = NULL;
  468         int32_t t1;
  469         caddr_t cp2;
  470         int rdev;
  471         struct mbuf *md;
  472         enum vtype vtyp;
  473         u_short vmode;
  474         struct timespec mtime, mtime_save;
  475         int v3 = NFS_ISV3(vp);
  476         struct thread *td = curthread;
  477         int error = 0;
  478 
  479         md = *mdp;
  480         t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
  481         cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_WAIT);
  482         if (cp2 == NULL) {
  483                 error = EBADRPC;
  484                 goto out;
  485         }
  486         fp = (struct nfs_fattr *)cp2;
  487         if (v3) {
  488                 vtyp = nfsv3tov_type(fp->fa_type);
  489                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  490                 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
  491                         fxdr_unsigned(int, fp->fa3_rdev.specdata2));
  492                 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
  493         } else {
  494                 vtyp = nfsv2tov_type(fp->fa_type);
  495                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  496                 /*
  497                  * XXX
  498                  *
  499                  * The duplicate information returned in fa_type and fa_mode
  500                  * is an ambiguity in the NFS version 2 protocol.
  501                  *
  502                  * VREG should be taken literally as a regular file.  If a
  503                  * server intents to return some type information differently
  504                  * in the upper bits of the mode field (e.g. for sockets, or
  505                  * FIFOs), NFSv2 mandates fa_type to be VNON.  Anyway, we
  506                  * leave the examination of the mode bits even in the VREG
  507                  * case to avoid breakage for bogus servers, but we make sure
  508                  * that there are actually type bits set in the upper part of
  509                  * fa_mode (and failing that, trust the va_type field).
  510                  *
  511                  * NFSv3 cleared the issue, and requires fa_mode to not
  512                  * contain any type information (while also introduing sockets
  513                  * and FIFOs for fa_type).
  514                  */
  515                 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
  516                         vtyp = IFTOVT(vmode);
  517                 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
  518                 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
  519 
  520                 /*
  521                  * Really ugly NFSv2 kludge.
  522                  */
  523                 if (vtyp == VCHR && rdev == 0xffffffff)
  524                         vtyp = VFIFO;
  525         }
  526 
  527         /*
  528          * If v_type == VNON it is a new node, so fill in the v_type,
  529          * n_mtime fields. Check to see if it represents a special
  530          * device, and if so, check for a possible alias. Once the
  531          * correct vnode has been obtained, fill in the rest of the
  532          * information.
  533          */
  534         np = VTONFS(vp);
  535         mtx_lock(&np->n_mtx);
  536         if (vp->v_type != vtyp) {
  537                 vp->v_type = vtyp;
  538                 if (vp->v_type == VFIFO)
  539                         vp->v_op = &nfs_fifoops;
  540                 np->n_mtime = mtime;
  541         }
  542         vap = &np->n_vattr;
  543         vap->va_type = vtyp;
  544         vap->va_mode = (vmode & 07777);
  545         vap->va_rdev = rdev;
  546         mtime_save = vap->va_mtime;
  547         vap->va_mtime = mtime;
  548         vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  549         if (v3) {
  550                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  551                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  552                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  553                 vap->va_size = fxdr_hyper(&fp->fa3_size);
  554                 vap->va_blocksize = NFS_FABLKSIZE;
  555                 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
  556                 vap->va_fileid = fxdr_unsigned(int32_t,
  557                     fp->fa3_fileid.nfsuquad[1]);
  558                 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
  559                 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
  560                 vap->va_flags = 0;
  561                 vap->va_filerev = 0;
  562         } else {
  563                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  564                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  565                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  566                 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
  567                 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
  568                 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
  569                     * NFS_FABLKSIZE;
  570                 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
  571                 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
  572                 vap->va_flags = 0;
  573                 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
  574                     fp->fa2_ctime.nfsv2_sec);
  575                 vap->va_ctime.tv_nsec = 0;
  576                 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
  577                 vap->va_filerev = 0;
  578         }
  579         np->n_attrstamp = time_second;
  580         /* Timestamp the NFS otw getattr fetch */
  581         if (td->td_proc) {
  582                 np->n_ac_ts_tid = td->td_tid;
  583                 np->n_ac_ts_pid = td->td_proc->p_pid;
  584                 np->n_ac_ts_syscalls = td->td_syscalls;
  585         } else
  586                 bzero(&np->n_ac_ts, sizeof(struct nfs_attrcache_timestamp));
  587         
  588         if (vap->va_size != np->n_size) {
  589                 if (vap->va_type == VREG) {
  590                         if (dontshrink && vap->va_size < np->n_size) {
  591                                 /*
  592                                  * We've been told not to shrink the file;
  593                                  * zero np->n_attrstamp to indicate that
  594                                  * the attributes are stale.
  595                                  */
  596                                 vap->va_size = np->n_size;
  597                                 np->n_attrstamp = 0;
  598                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  599                         } else if (np->n_flag & NMODIFIED) {
  600                                 /*
  601                                  * We've modified the file: Use the larger
  602                                  * of our size, and the server's size.
  603                                  */
  604                                 if (vap->va_size < np->n_size) {
  605                                         vap->va_size = np->n_size;
  606                                 } else {
  607                                         np->n_size = vap->va_size;
  608                                         np->n_flag |= NSIZECHANGED;
  609                                 }
  610                         } else {
  611                                 np->n_size = vap->va_size;
  612                                 np->n_flag |= NSIZECHANGED;
  613                         }
  614                         vnode_pager_setsize(vp, np->n_size);
  615                 } else {
  616                         np->n_size = vap->va_size;
  617                 }
  618         }
  619         /*
  620          * The following checks are added to prevent a race between (say)
  621          * a READDIR+ and a WRITE. 
  622          * READDIR+, WRITE requests sent out.
  623          * READDIR+ resp, WRITE resp received on client.
  624          * However, the WRITE resp was handled before the READDIR+ resp
  625          * causing the post op attrs from the write to be loaded first
  626          * and the attrs from the READDIR+ to be loaded later. If this 
  627          * happens, we have stale attrs loaded into the attrcache.
  628          * We detect this by for the mtime moving back. We invalidate the 
  629          * attrcache when this happens.
  630          */
  631         if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
  632                 /* Size changed or mtime went backwards */
  633                 np->n_attrstamp = 0;
  634                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  635         }
  636         if (vaper != NULL) {
  637                 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  638                 if (np->n_flag & NCHG) {
  639                         if (np->n_flag & NACC)
  640                                 vaper->va_atime = np->n_atim;
  641                         if (np->n_flag & NUPD)
  642                                 vaper->va_mtime = np->n_mtim;
  643                 }
  644         }
  645 
  646 #ifdef KDTRACE_HOOKS
  647         if (np->n_attrstamp != 0)
  648                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, &np->n_vattr, 0);
  649 #endif
  650         mtx_unlock(&np->n_mtx);
  651 out:
  652 #ifdef KDTRACE_HOOKS
  653         if (error)
  654                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, NULL, error);
  655 #endif
  656         return (error);
  657 }
  658 
  659 #ifdef NFS_ACDEBUG
  660 #include <sys/sysctl.h>
  661 SYSCTL_DECL(_vfs_nfs);
  662 static int nfs_acdebug;
  663 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0,
  664     "Toggle acdebug (access cache debug) flag");
  665 #endif
  666 
  667 /*
  668  * Check the time stamp
  669  * If the cache is valid, copy contents to *vap and return 0
  670  * otherwise return an error
  671  */
  672 int
  673 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
  674 {
  675         struct nfsnode *np;
  676         struct vattr *vap;
  677         struct nfsmount *nmp;
  678         int timeo;
  679         
  680         np = VTONFS(vp);
  681         vap = &np->n_vattr;
  682         nmp = VFSTONFS(vp->v_mount);
  683 #ifdef NFS_ACDEBUG
  684         mtx_lock(&Giant);       /* nfs_printf() */
  685 #endif
  686         mtx_lock(&np->n_mtx);
  687         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  688         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  689 
  690 #ifdef NFS_ACDEBUG
  691         if (nfs_acdebug>1)
  692                 nfs_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  693 #endif
  694 
  695         if (vap->va_type == VDIR) {
  696                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  697                         timeo = nmp->nm_acdirmin;
  698                 else if (timeo > nmp->nm_acdirmax)
  699                         timeo = nmp->nm_acdirmax;
  700         } else {
  701                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  702                         timeo = nmp->nm_acregmin;
  703                 else if (timeo > nmp->nm_acregmax)
  704                         timeo = nmp->nm_acregmax;
  705         }
  706 
  707 #ifdef NFS_ACDEBUG
  708         if (nfs_acdebug > 2)
  709                 nfs_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  710                            nmp->nm_acregmin, nmp->nm_acregmax,
  711                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  712 
  713         if (nfs_acdebug)
  714                 nfs_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  715                            (time_second - np->n_attrstamp), timeo);
  716 #endif
  717 
  718         if ((time_second - np->n_attrstamp) >= timeo) {
  719                 nfsstats.attrcache_misses++;
  720                 mtx_unlock(&np->n_mtx);
  721                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  722                 return (ENOENT);
  723         }
  724         nfsstats.attrcache_hits++;
  725         if (vap->va_size != np->n_size) {
  726                 if (vap->va_type == VREG) {
  727                         if (np->n_flag & NMODIFIED) {
  728                                 if (vap->va_size < np->n_size)
  729                                         vap->va_size = np->n_size;
  730                                 else
  731                                         np->n_size = vap->va_size;
  732                         } else {
  733                                 np->n_size = vap->va_size;
  734                         }
  735                         vnode_pager_setsize(vp, np->n_size);
  736                 } else {
  737                         np->n_size = vap->va_size;
  738                 }
  739         }
  740         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  741         if (np->n_flag & NCHG) {
  742                 if (np->n_flag & NACC)
  743                         vaper->va_atime = np->n_atim;
  744                 if (np->n_flag & NUPD)
  745                         vaper->va_mtime = np->n_mtim;
  746         }
  747         mtx_unlock(&np->n_mtx);
  748 #ifdef NFS_ACDEBUG
  749         mtx_unlock(&Giant);     /* nfs_printf() */
  750 #endif
  751         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  752         return (0);
  753 }
  754 
  755 /*
  756  * Purge all cached information about an NFS vnode including name
  757  * cache entries, the attribute cache, and the access cache.  This is
  758  * called when an NFS request for a node fails with a stale
  759  * filehandle.
  760  */
  761 void
  762 nfs_purgecache(struct vnode *vp)
  763 {
  764         struct nfsnode *np;
  765         int i;
  766 
  767         np = VTONFS(vp);
  768         cache_purge(vp);
  769         mtx_lock(&np->n_mtx);
  770         np->n_attrstamp = 0;
  771         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  772         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  773                 np->n_accesscache[i].stamp = 0;
  774         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  775         mtx_unlock(&np->n_mtx);
  776 }
  777 
  778 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  779 /*
  780  * This function finds the directory cookie that corresponds to the
  781  * logical byte offset given.
  782  */
  783 nfsuint64 *
  784 nfs_getcookie(struct nfsnode *np, off_t off, int add)
  785 {
  786         struct nfsdmap *dp, *dp2;
  787         int pos;
  788         nfsuint64 *retval = NULL;
  789         
  790         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  791         if (pos == 0 || off < 0) {
  792 #ifdef DIAGNOSTIC
  793                 if (add)
  794                         panic("nfs getcookie add at <= 0");
  795 #endif
  796                 return (&nfs_nullcookie);
  797         }
  798         pos--;
  799         dp = LIST_FIRST(&np->n_cookies);
  800         if (!dp) {
  801                 if (add) {
  802                         dp = malloc(sizeof (struct nfsdmap),
  803                                 M_NFSDIROFF, M_WAITOK);
  804                         dp->ndm_eocookie = 0;
  805                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  806                 } else
  807                         goto out;
  808         }
  809         while (pos >= NFSNUMCOOKIES) {
  810                 pos -= NFSNUMCOOKIES;
  811                 if (LIST_NEXT(dp, ndm_list)) {
  812                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  813                             pos >= dp->ndm_eocookie)
  814                                 goto out;
  815                         dp = LIST_NEXT(dp, ndm_list);
  816                 } else if (add) {
  817                         dp2 = malloc(sizeof (struct nfsdmap),
  818                                 M_NFSDIROFF, M_WAITOK);
  819                         dp2->ndm_eocookie = 0;
  820                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  821                         dp = dp2;
  822                 } else
  823                         goto out;
  824         }
  825         if (pos >= dp->ndm_eocookie) {
  826                 if (add)
  827                         dp->ndm_eocookie = pos + 1;
  828                 else
  829                         goto out;
  830         }
  831         retval = &dp->ndm_cookies[pos];
  832 out:
  833         return (retval);
  834 }
  835 
  836 /*
  837  * Invalidate cached directory information, except for the actual directory
  838  * blocks (which are invalidated separately).
  839  * Done mainly to avoid the use of stale offset cookies.
  840  */
  841 void
  842 nfs_invaldir(struct vnode *vp)
  843 {
  844         struct nfsnode *np = VTONFS(vp);
  845 
  846 #ifdef DIAGNOSTIC
  847         if (vp->v_type != VDIR)
  848                 panic("nfs: invaldir not dir");
  849 #endif
  850         nfs_dircookie_lock(np);
  851         np->n_direofoffset = 0;
  852         np->n_cookieverf.nfsuquad[0] = 0;
  853         np->n_cookieverf.nfsuquad[1] = 0;
  854         if (LIST_FIRST(&np->n_cookies))
  855                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  856         nfs_dircookie_unlock(np);
  857 }
  858 
  859 /*
  860  * The write verifier has changed (probably due to a server reboot), so all
  861  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  862  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  863  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  864  * mount point.
  865  *
  866  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  867  * writes are not clusterable.
  868  */
  869 void
  870 nfs_clearcommit(struct mount *mp)
  871 {
  872         struct vnode *vp, *nvp;
  873         struct buf *bp, *nbp;
  874         struct bufobj *bo;
  875 
  876         MNT_ILOCK(mp);
  877         MNT_VNODE_FOREACH(vp, mp, nvp) {
  878                 bo = &vp->v_bufobj;
  879                 VI_LOCK(vp);
  880                 if (vp->v_iflag & VI_DOOMED) {
  881                         VI_UNLOCK(vp);
  882                         continue;
  883                 }
  884                 vholdl(vp);
  885                 VI_UNLOCK(vp);
  886                 MNT_IUNLOCK(mp);
  887                 BO_LOCK(bo);
  888                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  889                         if (!BUF_ISLOCKED(bp) &&
  890                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  891                                 == (B_DELWRI | B_NEEDCOMMIT))
  892                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  893                 }
  894                 BO_UNLOCK(bo);
  895                 vdrop(vp);
  896                 MNT_ILOCK(mp);
  897         }
  898         MNT_IUNLOCK(mp);
  899 }
  900 
  901 /*
  902  * Helper functions for former macros.  Some of these should be
  903  * moved to their callers.
  904  */
  905 
  906 int
  907 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
  908     struct mbuf **md, caddr_t *dpos)
  909 {
  910         struct nfsnode *ttnp;
  911         struct vnode *ttvp;
  912         nfsfh_t *ttfhp;
  913         u_int32_t *tl;
  914         int ttfhsize;
  915         int t1;
  916 
  917         if (v3) {
  918                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  919                 if (tl == NULL)
  920                         return EBADRPC;
  921                 *f = fxdr_unsigned(int, *tl);
  922         } else
  923                 *f = 1;
  924         if (*f) {
  925                 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
  926                 if (t1 != 0)
  927                         return t1;
  928                 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp, LK_EXCLUSIVE);
  929                 if (t1 != 0)
  930                         return t1;
  931                 *v = NFSTOV(ttnp);
  932         }
  933         if (v3) {
  934                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  935                 if (tl == NULL)
  936                         return EBADRPC;
  937                 if (*f)
  938                         *f = fxdr_unsigned(int, *tl);
  939                 else if (fxdr_unsigned(int, *tl))
  940                         nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
  941         }
  942         if (*f) {
  943                 ttvp = *v;
  944                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
  945                 if (t1)
  946                         return t1;
  947                 *v = ttvp;
  948         }
  949         return 0;
  950 }
  951 
  952 int
  953 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
  954 {
  955         u_int32_t *tl;
  956 
  957         if (v3) {
  958                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  959                 if (tl == NULL)
  960                         return EBADRPC;
  961                 *s = fxdr_unsigned(int, *tl);
  962                 if (*s <= 0 || *s > NFSX_V3FHMAX)
  963                         return EBADRPC;
  964         } else
  965                 *s = NFSX_V2FH;
  966         *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
  967         if (*f == NULL)
  968                 return EBADRPC;
  969         else
  970                 return 0;
  971 }
  972 
  973 
  974 int
  975 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
  976                  caddr_t *dpos)
  977 {
  978         int t1;
  979 
  980         struct vnode *ttvp = *v;
  981         t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
  982         if (t1 != 0)
  983                 return t1;
  984         *v = ttvp;
  985         return 0;
  986 }
  987 
  988 int
  989 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md,
  990                     caddr_t *dpos)
  991 {
  992         u_int32_t *tl;
  993         int t1;
  994 
  995         struct vnode *ttvp = *v;
  996         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  997         if (tl == NULL)
  998                 return EBADRPC;
  999         *f = fxdr_unsigned(int, *tl);
 1000         if (*f != 0) {
 1001                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1);
 1002                 if (t1 != 0) {
 1003                         *f = 0;
 1004                         return t1;
 1005                 }
 1006                 *v = ttvp;
 1007         }
 1008         return 0;
 1009 }
 1010 
 1011 int
 1012 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
 1013 {
 1014         u_int32_t *tl;
 1015         int ttattrf, ttretf = 0;
 1016         int t1;
 1017 
 1018         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
 1019         if (tl == NULL)
 1020                 return EBADRPC;
 1021         if (*tl == nfs_true) {
 1022                 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
 1023                 if (tl == NULL)
 1024                         return EBADRPC;
 1025                 mtx_lock(&(VTONFS(*v))->n_mtx);
 1026                 if (*f)
 1027                         ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) && 
 1028                                   VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3))); 
 1029                 mtx_unlock(&(VTONFS(*v))->n_mtx);
 1030         }
 1031         t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos);
 1032         if (t1)
 1033                 return t1;
 1034         if (*f)
 1035                 *f = ttretf;
 1036         else
 1037                 *f = ttattrf;
 1038         return 0;
 1039 }
 1040 
 1041 int
 1042 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
 1043 {
 1044         u_int32_t *tl;
 1045         int t1;
 1046 
 1047         if (s > m)
 1048                 return ENAMETOOLONG;
 1049         t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
 1050         if (t1 <= M_TRAILINGSPACE(*mb)) {
 1051                 tl = nfsm_build_xx(t1, mb, bpos);
 1052                 *tl++ = txdr_unsigned(s);
 1053                 *(tl + ((t1 >> 2) - 2)) = 0;
 1054                 bcopy(a, tl, s);
 1055         } else {
 1056                 t1 = nfsm_strtmbuf(mb, bpos, a, s);
 1057                 if (t1 != 0)
 1058                         return t1;
 1059         }
 1060         return 0;
 1061 }
 1062 
 1063 int
 1064 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
 1065 {
 1066         u_int32_t *tl;
 1067         int t1;
 1068         caddr_t cp;
 1069 
 1070         if (v3) {
 1071                 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
 1072                 if (t1 < M_TRAILINGSPACE(*mb)) {
 1073                         tl = nfsm_build_xx(t1, mb, bpos);
 1074                         *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
 1075                         *(tl + ((t1 >> 2) - 2)) = 0;
 1076                         bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
 1077                 } else {
 1078                         t1 = nfsm_strtmbuf(mb, bpos,
 1079                             (const char *)VTONFS(v)->n_fhp,
 1080                             VTONFS(v)->n_fhsize);
 1081                         if (t1 != 0)
 1082                                 return t1;
 1083                 }
 1084         } else {
 1085                 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
 1086                 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
 1087         }
 1088         return 0;
 1089 }
 1090 
 1091 void
 1092 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
 1093     caddr_t *bpos)
 1094 {
 1095         u_int32_t *tl;
 1096 
 1097         if (va->va_mode != (mode_t)VNOVAL) {
 1098                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1099                 *tl++ = nfs_true;
 1100                 *tl = txdr_unsigned(va->va_mode);
 1101         } else {
 1102                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1103                 *tl = nfs_false;
 1104         }
 1105         if (full && va->va_uid != (uid_t)VNOVAL) {
 1106                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1107                 *tl++ = nfs_true;
 1108                 *tl = txdr_unsigned(va->va_uid);
 1109         } else {
 1110                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1111                 *tl = nfs_false;
 1112         }
 1113         if (full && va->va_gid != (gid_t)VNOVAL) {
 1114                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1115                 *tl++ = nfs_true;
 1116                 *tl = txdr_unsigned(va->va_gid);
 1117         } else {
 1118                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1119                 *tl = nfs_false;
 1120         }
 1121         if (full && va->va_size != VNOVAL) {
 1122                 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1123                 *tl++ = nfs_true;
 1124                 txdr_hyper(va->va_size, tl);
 1125         } else {
 1126                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1127                 *tl = nfs_false;
 1128         }
 1129         if (va->va_atime.tv_sec != VNOVAL) {
 1130                 if (va->va_atime.tv_sec != time_second) {
 1131                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1132                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1133                         txdr_nfsv3time(&va->va_atime, tl);
 1134                 } else {
 1135                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1136                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1137                 }
 1138         } else {
 1139                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1140                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1141         }
 1142         if (va->va_mtime.tv_sec != VNOVAL) {
 1143                 if (va->va_mtime.tv_sec != time_second) {
 1144                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1145                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1146                         txdr_nfsv3time(&va->va_mtime, tl);
 1147                 } else {
 1148                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1149                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1150                 }
 1151         } else {
 1152                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1153                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1154         }
 1155 }

Cache object: 2ff2a88c0cf6469a86df1355257ab4a3


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