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: stable/8/sys/nfsclient/nfs_subs.c 253229 2013-07-12 00:59:03Z rmacklem $");
   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 #include <sys/taskqueue.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/vm_object.h>
   66 #include <vm/vm_extern.h>
   67 #include <vm/uma.h>
   68 
   69 #include <nfs/nfsproto.h>
   70 #include <nfsclient/nfs.h>
   71 #include <nfsclient/nfsnode.h>
   72 #include <nfsclient/nfs_kdtrace.h>
   73 #include <nfs/xdr_subs.h>
   74 #include <nfsclient/nfsm_subs.h>
   75 #include <nfsclient/nfsmount.h>
   76 
   77 #include <netinet/in.h>
   78 
   79 /*
   80  * Note that stdarg.h and the ANSI style va_start macro is used for both
   81  * ANSI and traditional C compilers.
   82  */
   83 #include <machine/stdarg.h>
   84 
   85 #ifdef KDTRACE_HOOKS
   86 dtrace_nfsclient_attrcache_flush_probe_func_t
   87     dtrace_nfsclient_attrcache_flush_done_probe;
   88 uint32_t nfsclient_attrcache_flush_done_id;
   89 
   90 dtrace_nfsclient_attrcache_get_hit_probe_func_t
   91     dtrace_nfsclient_attrcache_get_hit_probe;
   92 uint32_t nfsclient_attrcache_get_hit_id;
   93 
   94 dtrace_nfsclient_attrcache_get_miss_probe_func_t
   95     dtrace_nfsclient_attrcache_get_miss_probe;
   96 uint32_t nfsclient_attrcache_get_miss_id;
   97 
   98 dtrace_nfsclient_attrcache_load_probe_func_t
   99     dtrace_nfsclient_attrcache_load_done_probe;
  100 uint32_t nfsclient_attrcache_load_done_id;
  101 #endif /* !KDTRACE_HOOKS */
  102 
  103 /*
  104  * Data items converted to xdr at startup, since they are constant
  105  * This is kinda hokey, but may save a little time doing byte swaps
  106  */
  107 u_int32_t       nfs_xdrneg1;
  108 u_int32_t       nfs_true, nfs_false;
  109 
  110 /* And other global data */
  111 static u_int32_t nfs_xid = 0;
  112 static enum vtype nv2tov_type[8]= {
  113         VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON,  VNON
  114 };
  115 
  116 int             nfs_ticks;
  117 int             nfs_pbuf_freecnt = -1;  /* start out unlimited */
  118 
  119 struct nfs_bufq nfs_bufq;
  120 static struct mtx nfs_xid_mtx;
  121 struct task     nfs_nfsiodnew_task;
  122 
  123 /*
  124  * and the reverse mapping from generic to Version 2 procedure numbers
  125  */
  126 int nfsv2_procid[NFS_NPROCS] = {
  127         NFSV2PROC_NULL,
  128         NFSV2PROC_GETATTR,
  129         NFSV2PROC_SETATTR,
  130         NFSV2PROC_LOOKUP,
  131         NFSV2PROC_NOOP,
  132         NFSV2PROC_READLINK,
  133         NFSV2PROC_READ,
  134         NFSV2PROC_WRITE,
  135         NFSV2PROC_CREATE,
  136         NFSV2PROC_MKDIR,
  137         NFSV2PROC_SYMLINK,
  138         NFSV2PROC_CREATE,
  139         NFSV2PROC_REMOVE,
  140         NFSV2PROC_RMDIR,
  141         NFSV2PROC_RENAME,
  142         NFSV2PROC_LINK,
  143         NFSV2PROC_READDIR,
  144         NFSV2PROC_NOOP,
  145         NFSV2PROC_STATFS,
  146         NFSV2PROC_NOOP,
  147         NFSV2PROC_NOOP,
  148         NFSV2PROC_NOOP,
  149         NFSV2PROC_NOOP,
  150 };
  151 
  152 LIST_HEAD(nfsnodehashhead, nfsnode);
  153 
  154 u_int32_t
  155 nfs_xid_gen(void)
  156 {
  157         uint32_t xid;
  158 
  159         mtx_lock(&nfs_xid_mtx);
  160 
  161         /* Get a pretty random xid to start with */
  162         if (!nfs_xid)
  163                 nfs_xid = random();
  164         /*
  165          * Skip zero xid if it should ever happen.
  166          */
  167         if (++nfs_xid == 0)
  168                 nfs_xid++;
  169         xid = nfs_xid;
  170         mtx_unlock(&nfs_xid_mtx);
  171         return xid;
  172 }
  173 
  174 /*
  175  * Create the header for an rpc request packet
  176  * The hsiz is the size of the rest of the nfs request header.
  177  * (just used to decide if a cluster is a good idea)
  178  */
  179 struct mbuf *
  180 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
  181 {
  182         struct mbuf *mb;
  183 
  184         MGET(mb, M_WAIT, MT_DATA);
  185         if (hsiz >= MINCLSIZE)
  186                 MCLGET(mb, M_WAIT);
  187         mb->m_len = 0;
  188         return (mb);
  189 }
  190 
  191 /*
  192  * copies a uio scatter/gather list to an mbuf chain.
  193  * NOTE: can ony handle iovcnt == 1
  194  */
  195 int
  196 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
  197 {
  198         char *uiocp;
  199         struct mbuf *mp, *mp2;
  200         int xfer, left, mlen;
  201         int uiosiz, clflg, rem;
  202         char *cp;
  203 
  204         KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
  205 
  206         if (siz > MLEN)         /* or should it >= MCLBYTES ?? */
  207                 clflg = 1;
  208         else
  209                 clflg = 0;
  210         rem = nfsm_rndup(siz)-siz;
  211         mp = mp2 = *mq;
  212         while (siz > 0) {
  213                 left = uiop->uio_iov->iov_len;
  214                 uiocp = uiop->uio_iov->iov_base;
  215                 if (left > siz)
  216                         left = siz;
  217                 uiosiz = left;
  218                 while (left > 0) {
  219                         mlen = M_TRAILINGSPACE(mp);
  220                         if (mlen == 0) {
  221                                 MGET(mp, M_WAIT, MT_DATA);
  222                                 if (clflg)
  223                                         MCLGET(mp, M_WAIT);
  224                                 mp->m_len = 0;
  225                                 mp2->m_next = mp;
  226                                 mp2 = mp;
  227                                 mlen = M_TRAILINGSPACE(mp);
  228                         }
  229                         xfer = (left > mlen) ? mlen : left;
  230 #ifdef notdef
  231                         /* Not Yet.. */
  232                         if (uiop->uio_iov->iov_op != NULL)
  233                                 (*(uiop->uio_iov->iov_op))
  234                                 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  235                         else
  236 #endif
  237                         if (uiop->uio_segflg == UIO_SYSSPACE)
  238                                 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  239                         else
  240                                 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  241                         mp->m_len += xfer;
  242                         left -= xfer;
  243                         uiocp += xfer;
  244                         uiop->uio_offset += xfer;
  245                         uiop->uio_resid -= xfer;
  246                 }
  247                 uiop->uio_iov->iov_base =
  248                     (char *)uiop->uio_iov->iov_base + uiosiz;
  249                 uiop->uio_iov->iov_len -= uiosiz;
  250                 siz -= uiosiz;
  251         }
  252         if (rem > 0) {
  253                 if (rem > M_TRAILINGSPACE(mp)) {
  254                         MGET(mp, M_WAIT, MT_DATA);
  255                         mp->m_len = 0;
  256                         mp2->m_next = mp;
  257                 }
  258                 cp = mtod(mp, caddr_t)+mp->m_len;
  259                 for (left = 0; left < rem; left++)
  260                         *cp++ = '\0';
  261                 mp->m_len += rem;
  262                 *bpos = cp;
  263         } else
  264                 *bpos = mtod(mp, caddr_t)+mp->m_len;
  265         *mq = mp;
  266         return (0);
  267 }
  268 
  269 /*
  270  * Copy a string into mbufs for the hard cases...
  271  */
  272 int
  273 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
  274 {
  275         struct mbuf *m1 = NULL, *m2;
  276         long left, xfer, len, tlen;
  277         u_int32_t *tl;
  278         int putsize;
  279 
  280         putsize = 1;
  281         m2 = *mb;
  282         left = M_TRAILINGSPACE(m2);
  283         if (left > 0) {
  284                 tl = ((u_int32_t *)(*bpos));
  285                 *tl++ = txdr_unsigned(siz);
  286                 putsize = 0;
  287                 left -= NFSX_UNSIGNED;
  288                 m2->m_len += NFSX_UNSIGNED;
  289                 if (left > 0) {
  290                         bcopy(cp, (caddr_t) tl, left);
  291                         siz -= left;
  292                         cp += left;
  293                         m2->m_len += left;
  294                         left = 0;
  295                 }
  296         }
  297         /* Loop around adding mbufs */
  298         while (siz > 0) {
  299                 MGET(m1, M_WAIT, MT_DATA);
  300                 if (siz > MLEN)
  301                         MCLGET(m1, M_WAIT);
  302                 m1->m_len = NFSMSIZ(m1);
  303                 m2->m_next = m1;
  304                 m2 = m1;
  305                 tl = mtod(m1, u_int32_t *);
  306                 tlen = 0;
  307                 if (putsize) {
  308                         *tl++ = txdr_unsigned(siz);
  309                         m1->m_len -= NFSX_UNSIGNED;
  310                         tlen = NFSX_UNSIGNED;
  311                         putsize = 0;
  312                 }
  313                 if (siz < m1->m_len) {
  314                         len = nfsm_rndup(siz);
  315                         xfer = siz;
  316                         if (xfer < len)
  317                                 *(tl+(xfer>>2)) = 0;
  318                 } else {
  319                         xfer = len = m1->m_len;
  320                 }
  321                 bcopy(cp, (caddr_t) tl, xfer);
  322                 m1->m_len = len+tlen;
  323                 siz -= xfer;
  324                 cp += xfer;
  325         }
  326         *mb = m1;
  327         *bpos = mtod(m1, caddr_t)+m1->m_len;
  328         return (0);
  329 }
  330 
  331 /*
  332  * Called once to initialize data structures...
  333  */
  334 int
  335 nfs_init(struct vfsconf *vfsp)
  336 {
  337         int i;
  338 
  339         nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
  340             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
  341         nfs_true = txdr_unsigned(TRUE);
  342         nfs_false = txdr_unsigned(FALSE);
  343         nfs_xdrneg1 = txdr_unsigned(-1);
  344         nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
  345         if (nfs_ticks < 1)
  346                 nfs_ticks = 1;
  347         /* Ensure async daemons disabled */
  348         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  349                 nfs_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  350                 nfs_iodmount[i] = NULL;
  351         }
  352         nfs_nhinit();                   /* Init the nfsnode table */
  353 
  354         /*
  355          * Initialize reply list and start timer
  356          */
  357         mtx_init(&nfs_iod_mtx, "NFS iod lock", NULL, MTX_DEF);
  358         mtx_init(&nfs_xid_mtx, "NFS xid lock", NULL, MTX_DEF);
  359         TASK_INIT(&nfs_nfsiodnew_task, 0, nfs_nfsiodnew_tq, NULL);
  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          * Drain nfsiodnew task before we wait for them to finish.
  375          */
  376         mtx_lock(&nfs_iod_mtx);
  377         nfs_iodmax = 0;
  378         mtx_unlock(&nfs_iod_mtx);
  379         taskqueue_drain(taskqueue_thread, &nfs_nfsiodnew_task);
  380         mtx_lock(&nfs_iod_mtx);
  381         for (i = 0; i < nfs_numasync; i++)
  382                 if (nfs_iodwant[i] == NFSIOD_AVAILABLE)
  383                         wakeup(&nfs_iodwant[i]);
  384         /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */
  385         while (nfs_numasync)
  386                 msleep(&nfs_numasync, &nfs_iod_mtx, PWAIT, "ioddie", 0);
  387         mtx_unlock(&nfs_iod_mtx);
  388         nfs_nhuninit();
  389         uma_zdestroy(nfsmount_zone);
  390         return (0);
  391 }
  392 
  393 void 
  394 nfs_dircookie_lock(struct nfsnode *np)
  395 {
  396         mtx_lock(&np->n_mtx);
  397         while (np->n_flag & NDIRCOOKIELK)
  398                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  399         np->n_flag |= NDIRCOOKIELK;
  400         mtx_unlock(&np->n_mtx);
  401 }
  402 
  403 void 
  404 nfs_dircookie_unlock(struct nfsnode *np)
  405 {
  406         mtx_lock(&np->n_mtx);
  407         np->n_flag &= ~NDIRCOOKIELK;
  408         wakeup(&np->n_flag);
  409         mtx_unlock(&np->n_mtx);
  410 }
  411 
  412 int
  413 nfs_upgrade_vnlock(struct vnode *vp)
  414 {
  415         int old_lock;
  416 
  417         ASSERT_VOP_LOCKED(vp, "nfs_upgrade_vnlock");
  418         old_lock = VOP_ISLOCKED(vp);
  419         if (old_lock != LK_EXCLUSIVE) {
  420                 KASSERT(old_lock == LK_SHARED,
  421                     ("nfs_upgrade_vnlock: wrong old_lock %d", old_lock));
  422                 /* Upgrade to exclusive lock, this might block */
  423                 vn_lock(vp, LK_UPGRADE | LK_RETRY);
  424         }
  425         return (old_lock);
  426 }
  427 
  428 void
  429 nfs_downgrade_vnlock(struct vnode *vp, int old_lock)
  430 {
  431         if (old_lock != LK_EXCLUSIVE) {
  432                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  433                 /* Downgrade from exclusive lock. */
  434                 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  435         }
  436 }
  437 
  438 void
  439 nfs_printf(const char *fmt, ...)
  440 {
  441         va_list ap;
  442 
  443         mtx_lock(&Giant);
  444         va_start(ap, fmt);
  445         vprintf(fmt, ap);
  446         va_end(ap);
  447         mtx_unlock(&Giant);
  448 }
  449 
  450 /*
  451  * Attribute cache routines.
  452  * nfs_loadattrcache() - loads or updates the cache contents from attributes
  453  *      that are on the mbuf list
  454  * nfs_getattrcache() - returns valid attributes if found in cache, returns
  455  *      error otherwise
  456  */
  457 
  458 /*
  459  * Load the attribute cache (that lives in the nfsnode entry) with
  460  * the values on the mbuf list and
  461  * Iff vap not NULL
  462  *    copy the attributes to *vaper
  463  */
  464 int
  465 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
  466                   struct vattr *vaper, int dontshrink)
  467 {
  468         struct vnode *vp = *vpp;
  469         struct vattr *vap;
  470         struct nfs_fattr *fp;
  471         struct nfsnode *np = NULL;
  472         int32_t t1;
  473         caddr_t cp2;
  474         int rdev;
  475         struct mbuf *md;
  476         enum vtype vtyp;
  477         u_short vmode;
  478         struct timespec mtime, mtime_save;
  479         int v3 = NFS_ISV3(vp);
  480         int error = 0;
  481         u_quad_t nsize;
  482         int setnsize;
  483 
  484         md = *mdp;
  485         t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
  486         cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_WAIT);
  487         if (cp2 == NULL) {
  488                 error = EBADRPC;
  489                 goto out;
  490         }
  491         fp = (struct nfs_fattr *)cp2;
  492         if (v3) {
  493                 vtyp = nfsv3tov_type(fp->fa_type);
  494                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  495                 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
  496                         fxdr_unsigned(int, fp->fa3_rdev.specdata2));
  497                 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
  498         } else {
  499                 vtyp = nfsv2tov_type(fp->fa_type);
  500                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  501                 /*
  502                  * XXX
  503                  *
  504                  * The duplicate information returned in fa_type and fa_mode
  505                  * is an ambiguity in the NFS version 2 protocol.
  506                  *
  507                  * VREG should be taken literally as a regular file.  If a
  508                  * server intents to return some type information differently
  509                  * in the upper bits of the mode field (e.g. for sockets, or
  510                  * FIFOs), NFSv2 mandates fa_type to be VNON.  Anyway, we
  511                  * leave the examination of the mode bits even in the VREG
  512                  * case to avoid breakage for bogus servers, but we make sure
  513                  * that there are actually type bits set in the upper part of
  514                  * fa_mode (and failing that, trust the va_type field).
  515                  *
  516                  * NFSv3 cleared the issue, and requires fa_mode to not
  517                  * contain any type information (while also introduing sockets
  518                  * and FIFOs for fa_type).
  519                  */
  520                 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
  521                         vtyp = IFTOVT(vmode);
  522                 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
  523                 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
  524 
  525                 /*
  526                  * Really ugly NFSv2 kludge.
  527                  */
  528                 if (vtyp == VCHR && rdev == 0xffffffff)
  529                         vtyp = VFIFO;
  530         }
  531 
  532         /*
  533          * If v_type == VNON it is a new node, so fill in the v_type,
  534          * n_mtime fields. Check to see if it represents a special
  535          * device, and if so, check for a possible alias. Once the
  536          * correct vnode has been obtained, fill in the rest of the
  537          * information.
  538          */
  539         np = VTONFS(vp);
  540         mtx_lock(&np->n_mtx);
  541         if (vp->v_type != vtyp) {
  542                 vp->v_type = vtyp;
  543                 if (vp->v_type == VFIFO)
  544                         vp->v_op = &nfs_fifoops;
  545                 np->n_mtime = mtime;
  546         }
  547         vap = &np->n_vattr;
  548         vap->va_type = vtyp;
  549         vap->va_mode = (vmode & 07777);
  550         vap->va_rdev = rdev;
  551         mtime_save = vap->va_mtime;
  552         vap->va_mtime = mtime;
  553         vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  554         if (v3) {
  555                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  556                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  557                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  558                 vap->va_size = fxdr_hyper(&fp->fa3_size);
  559                 vap->va_blocksize = NFS_FABLKSIZE;
  560                 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
  561                 vap->va_fileid = fxdr_unsigned(int32_t,
  562                     fp->fa3_fileid.nfsuquad[1]);
  563                 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
  564                 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
  565                 vap->va_flags = 0;
  566                 vap->va_filerev = 0;
  567         } else {
  568                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  569                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  570                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  571                 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
  572                 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
  573                 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
  574                     * NFS_FABLKSIZE;
  575                 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
  576                 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
  577                 vap->va_flags = 0;
  578                 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
  579                     fp->fa2_ctime.nfsv2_sec);
  580                 vap->va_ctime.tv_nsec = 0;
  581                 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
  582                 vap->va_filerev = 0;
  583         }
  584         np->n_attrstamp = time_second;
  585         setnsize = 0;
  586         nsize = 0;
  587         if (vap->va_size != np->n_size) {
  588                 if (vap->va_type == VREG) {
  589                         if (dontshrink && vap->va_size < np->n_size) {
  590                                 /*
  591                                  * We've been told not to shrink the file;
  592                                  * zero np->n_attrstamp to indicate that
  593                                  * the attributes are stale.
  594                                  */
  595                                 vap->va_size = np->n_size;
  596                                 np->n_attrstamp = 0;
  597                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  598                                 vnode_pager_setsize(vp, np->n_size);
  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                                 vnode_pager_setsize(vp, np->n_size);
  611                         } else if (vap->va_size < np->n_size) {
  612                                 /*
  613                                  * When shrinking the size, the call to
  614                                  * vnode_pager_setsize() cannot be done
  615                                  * with the mutex held, so delay it until
  616                                  * after the mtx_unlock call.
  617                                  */
  618                                 nsize = np->n_size = vap->va_size;
  619                                 np->n_flag |= NSIZECHANGED;
  620                                 setnsize = 1;
  621                         } else {
  622                                 np->n_size = vap->va_size;
  623                                 np->n_flag |= NSIZECHANGED;
  624                                 vnode_pager_setsize(vp, np->n_size);
  625                         }
  626                 } else {
  627                         np->n_size = vap->va_size;
  628                 }
  629         }
  630         /*
  631          * The following checks are added to prevent a race between (say)
  632          * a READDIR+ and a WRITE. 
  633          * READDIR+, WRITE requests sent out.
  634          * READDIR+ resp, WRITE resp received on client.
  635          * However, the WRITE resp was handled before the READDIR+ resp
  636          * causing the post op attrs from the write to be loaded first
  637          * and the attrs from the READDIR+ to be loaded later. If this 
  638          * happens, we have stale attrs loaded into the attrcache.
  639          * We detect this by for the mtime moving back. We invalidate the 
  640          * attrcache when this happens.
  641          */
  642         if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
  643                 /* Size changed or mtime went backwards */
  644                 np->n_attrstamp = 0;
  645                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  646         }
  647         if (vaper != NULL) {
  648                 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  649                 if (np->n_flag & NCHG) {
  650                         if (np->n_flag & NACC)
  651                                 vaper->va_atime = np->n_atim;
  652                         if (np->n_flag & NUPD)
  653                                 vaper->va_mtime = np->n_mtim;
  654                 }
  655         }
  656 
  657 #ifdef KDTRACE_HOOKS
  658         if (np->n_attrstamp != 0)
  659                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, &np->n_vattr, 0);
  660 #endif
  661         mtx_unlock(&np->n_mtx);
  662         if (setnsize)
  663                 vnode_pager_setsize(vp, nsize);
  664 out:
  665 #ifdef KDTRACE_HOOKS
  666         if (error)
  667                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, NULL, error);
  668 #endif
  669         return (error);
  670 }
  671 
  672 #ifdef NFS_ACDEBUG
  673 #include <sys/sysctl.h>
  674 SYSCTL_DECL(_vfs_nfs);
  675 static int nfs_acdebug;
  676 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0,
  677     "Toggle acdebug (attribute cache debug) flag");
  678 #endif
  679 
  680 /*
  681  * Check the time stamp
  682  * If the cache is valid, copy contents to *vap and return 0
  683  * otherwise return an error
  684  */
  685 int
  686 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
  687 {
  688         struct nfsnode *np;
  689         struct vattr *vap;
  690         struct nfsmount *nmp;
  691         int timeo;
  692         
  693         np = VTONFS(vp);
  694         vap = &np->n_vattr;
  695         nmp = VFSTONFS(vp->v_mount);
  696 #ifdef NFS_ACDEBUG
  697         mtx_lock(&Giant);       /* nfs_printf() */
  698 #endif
  699         mtx_lock(&np->n_mtx);
  700         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  701         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  702 
  703 #ifdef NFS_ACDEBUG
  704         if (nfs_acdebug>1)
  705                 nfs_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  706 #endif
  707 
  708         if (vap->va_type == VDIR) {
  709                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  710                         timeo = nmp->nm_acdirmin;
  711                 else if (timeo > nmp->nm_acdirmax)
  712                         timeo = nmp->nm_acdirmax;
  713         } else {
  714                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  715                         timeo = nmp->nm_acregmin;
  716                 else if (timeo > nmp->nm_acregmax)
  717                         timeo = nmp->nm_acregmax;
  718         }
  719 
  720 #ifdef NFS_ACDEBUG
  721         if (nfs_acdebug > 2)
  722                 nfs_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  723                            nmp->nm_acregmin, nmp->nm_acregmax,
  724                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  725 
  726         if (nfs_acdebug)
  727                 nfs_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  728                            (time_second - np->n_attrstamp), timeo);
  729 #endif
  730 
  731         if ((time_second - np->n_attrstamp) >= timeo) {
  732                 nfsstats.attrcache_misses++;
  733                 mtx_unlock(&np->n_mtx);
  734 #ifdef NFS_ACDEBUG
  735                 mtx_unlock(&Giant);     /* nfs_printf() */
  736 #endif
  737                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  738                 return (ENOENT);
  739         }
  740         nfsstats.attrcache_hits++;
  741         if (vap->va_size != np->n_size) {
  742                 if (vap->va_type == VREG) {
  743                         if (np->n_flag & NMODIFIED) {
  744                                 if (vap->va_size < np->n_size)
  745                                         vap->va_size = np->n_size;
  746                                 else
  747                                         np->n_size = vap->va_size;
  748                         } else {
  749                                 np->n_size = vap->va_size;
  750                         }
  751                         vnode_pager_setsize(vp, np->n_size);
  752                 } else {
  753                         np->n_size = vap->va_size;
  754                 }
  755         }
  756         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  757         if (np->n_flag & NCHG) {
  758                 if (np->n_flag & NACC)
  759                         vaper->va_atime = np->n_atim;
  760                 if (np->n_flag & NUPD)
  761                         vaper->va_mtime = np->n_mtim;
  762         }
  763         mtx_unlock(&np->n_mtx);
  764 #ifdef NFS_ACDEBUG
  765         mtx_unlock(&Giant);     /* nfs_printf() */
  766 #endif
  767         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  768         return (0);
  769 }
  770 
  771 /*
  772  * Purge all cached information about an NFS vnode including name
  773  * cache entries, the attribute cache, and the access cache.  This is
  774  * called when an NFS request for a node fails with a stale
  775  * filehandle.
  776  */
  777 void
  778 nfs_purgecache(struct vnode *vp)
  779 {
  780         struct nfsnode *np;
  781         int i;
  782 
  783         np = VTONFS(vp);
  784         cache_purge(vp);
  785         mtx_lock(&np->n_mtx);
  786         np->n_attrstamp = 0;
  787         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  788         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  789                 np->n_accesscache[i].stamp = 0;
  790         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  791         mtx_unlock(&np->n_mtx);
  792 }
  793 
  794 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  795 /*
  796  * This function finds the directory cookie that corresponds to the
  797  * logical byte offset given.
  798  */
  799 nfsuint64 *
  800 nfs_getcookie(struct nfsnode *np, off_t off, int add)
  801 {
  802         struct nfsdmap *dp, *dp2;
  803         int pos;
  804         nfsuint64 *retval = NULL;
  805         
  806         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  807         if (pos == 0 || off < 0) {
  808                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  809                 return (&nfs_nullcookie);
  810         }
  811         pos--;
  812         dp = LIST_FIRST(&np->n_cookies);
  813         if (!dp) {
  814                 if (add) {
  815                         dp = malloc(sizeof (struct nfsdmap),
  816                                 M_NFSDIROFF, M_WAITOK);
  817                         dp->ndm_eocookie = 0;
  818                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  819                 } else
  820                         goto out;
  821         }
  822         while (pos >= NFSNUMCOOKIES) {
  823                 pos -= NFSNUMCOOKIES;
  824                 if (LIST_NEXT(dp, ndm_list)) {
  825                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  826                             pos >= dp->ndm_eocookie)
  827                                 goto out;
  828                         dp = LIST_NEXT(dp, ndm_list);
  829                 } else if (add) {
  830                         dp2 = malloc(sizeof (struct nfsdmap),
  831                                 M_NFSDIROFF, M_WAITOK);
  832                         dp2->ndm_eocookie = 0;
  833                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  834                         dp = dp2;
  835                 } else
  836                         goto out;
  837         }
  838         if (pos >= dp->ndm_eocookie) {
  839                 if (add)
  840                         dp->ndm_eocookie = pos + 1;
  841                 else
  842                         goto out;
  843         }
  844         retval = &dp->ndm_cookies[pos];
  845 out:
  846         return (retval);
  847 }
  848 
  849 /*
  850  * Invalidate cached directory information, except for the actual directory
  851  * blocks (which are invalidated separately).
  852  * Done mainly to avoid the use of stale offset cookies.
  853  */
  854 void
  855 nfs_invaldir(struct vnode *vp)
  856 {
  857         struct nfsnode *np = VTONFS(vp);
  858 
  859         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  860         nfs_dircookie_lock(np);
  861         np->n_direofoffset = 0;
  862         np->n_cookieverf.nfsuquad[0] = 0;
  863         np->n_cookieverf.nfsuquad[1] = 0;
  864         if (LIST_FIRST(&np->n_cookies))
  865                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  866         nfs_dircookie_unlock(np);
  867 }
  868 
  869 /*
  870  * The write verifier has changed (probably due to a server reboot), so all
  871  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  872  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  873  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  874  * mount point.
  875  *
  876  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  877  * writes are not clusterable.
  878  */
  879 void
  880 nfs_clearcommit(struct mount *mp)
  881 {
  882         struct vnode *vp, *nvp;
  883         struct buf *bp, *nbp;
  884         struct bufobj *bo;
  885 
  886         MNT_ILOCK(mp);
  887         MNT_VNODE_FOREACH(vp, mp, nvp) {
  888                 bo = &vp->v_bufobj;
  889                 VI_LOCK(vp);
  890                 if (vp->v_iflag & VI_DOOMED) {
  891                         VI_UNLOCK(vp);
  892                         continue;
  893                 }
  894                 vholdl(vp);
  895                 VI_UNLOCK(vp);
  896                 MNT_IUNLOCK(mp);
  897                 BO_LOCK(bo);
  898                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  899                         if (!BUF_ISLOCKED(bp) &&
  900                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  901                                 == (B_DELWRI | B_NEEDCOMMIT))
  902                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  903                 }
  904                 BO_UNLOCK(bo);
  905                 vdrop(vp);
  906                 MNT_ILOCK(mp);
  907         }
  908         MNT_IUNLOCK(mp);
  909 }
  910 
  911 /*
  912  * Helper functions for former macros.  Some of these should be
  913  * moved to their callers.
  914  */
  915 
  916 int
  917 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
  918     struct mbuf **md, caddr_t *dpos)
  919 {
  920         struct nfsnode *ttnp;
  921         struct vnode *ttvp;
  922         nfsfh_t *ttfhp;
  923         u_int32_t *tl;
  924         int ttfhsize;
  925         int t1;
  926 
  927         if (v3) {
  928                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  929                 if (tl == NULL)
  930                         return EBADRPC;
  931                 *f = fxdr_unsigned(int, *tl);
  932         } else
  933                 *f = 1;
  934         if (*f) {
  935                 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
  936                 if (t1 != 0)
  937                         return t1;
  938                 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp, LK_EXCLUSIVE);
  939                 if (t1 != 0)
  940                         return t1;
  941                 *v = NFSTOV(ttnp);
  942         }
  943         if (v3) {
  944                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  945                 if (tl == NULL)
  946                         return EBADRPC;
  947                 if (*f)
  948                         *f = fxdr_unsigned(int, *tl);
  949                 else if (fxdr_unsigned(int, *tl))
  950                         nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
  951         }
  952         if (*f) {
  953                 ttvp = *v;
  954                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
  955                 if (t1)
  956                         return t1;
  957                 *v = ttvp;
  958         }
  959         return 0;
  960 }
  961 
  962 int
  963 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
  964 {
  965         u_int32_t *tl;
  966 
  967         if (v3) {
  968                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  969                 if (tl == NULL)
  970                         return EBADRPC;
  971                 *s = fxdr_unsigned(int, *tl);
  972                 if (*s <= 0 || *s > NFSX_V3FHMAX)
  973                         return EBADRPC;
  974         } else
  975                 *s = NFSX_V2FH;
  976         *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
  977         if (*f == NULL)
  978                 return EBADRPC;
  979         else
  980                 return 0;
  981 }
  982 
  983 
  984 int
  985 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
  986                  caddr_t *dpos)
  987 {
  988         int t1;
  989 
  990         struct vnode *ttvp = *v;
  991         t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
  992         if (t1 != 0)
  993                 return t1;
  994         *v = ttvp;
  995         return 0;
  996 }
  997 
  998 int
  999 nfsm_postop_attr_xx(struct vnode **v, int *f, struct vattr *va,
 1000                     struct mbuf **md, caddr_t *dpos)
 1001 {
 1002         u_int32_t *tl;
 1003         int t1;
 1004 
 1005         struct vnode *ttvp = *v;
 1006         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
 1007         if (tl == NULL)
 1008                 return EBADRPC;
 1009         *f = fxdr_unsigned(int, *tl);
 1010         if (*f != 0) {
 1011                 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 1);
 1012                 if (t1 != 0) {
 1013                         *f = 0;
 1014                         return t1;
 1015                 }
 1016                 *v = ttvp;
 1017         }
 1018         return 0;
 1019 }
 1020 
 1021 int
 1022 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
 1023 {
 1024         u_int32_t *tl;
 1025         int ttattrf, ttretf = 0;
 1026         int t1;
 1027 
 1028         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
 1029         if (tl == NULL)
 1030                 return EBADRPC;
 1031         if (*tl == nfs_true) {
 1032                 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
 1033                 if (tl == NULL)
 1034                         return EBADRPC;
 1035                 mtx_lock(&(VTONFS(*v))->n_mtx);
 1036                 if (*f)
 1037                         ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) && 
 1038                                   VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3))); 
 1039                 mtx_unlock(&(VTONFS(*v))->n_mtx);
 1040         }
 1041         t1 = nfsm_postop_attr_xx(v, &ttattrf, NULL, md, dpos);
 1042         if (t1)
 1043                 return t1;
 1044         if (*f)
 1045                 *f = ttretf;
 1046         else
 1047                 *f = ttattrf;
 1048         return 0;
 1049 }
 1050 
 1051 int
 1052 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
 1053 {
 1054         u_int32_t *tl;
 1055         int t1;
 1056 
 1057         if (s > m)
 1058                 return ENAMETOOLONG;
 1059         t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
 1060         if (t1 <= M_TRAILINGSPACE(*mb)) {
 1061                 tl = nfsm_build_xx(t1, mb, bpos);
 1062                 *tl++ = txdr_unsigned(s);
 1063                 *(tl + ((t1 >> 2) - 2)) = 0;
 1064                 bcopy(a, tl, s);
 1065         } else {
 1066                 t1 = nfsm_strtmbuf(mb, bpos, a, s);
 1067                 if (t1 != 0)
 1068                         return t1;
 1069         }
 1070         return 0;
 1071 }
 1072 
 1073 int
 1074 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
 1075 {
 1076         u_int32_t *tl;
 1077         int t1;
 1078         caddr_t cp;
 1079 
 1080         if (v3) {
 1081                 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
 1082                 if (t1 < M_TRAILINGSPACE(*mb)) {
 1083                         tl = nfsm_build_xx(t1, mb, bpos);
 1084                         *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
 1085                         *(tl + ((t1 >> 2) - 2)) = 0;
 1086                         bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
 1087                 } else {
 1088                         t1 = nfsm_strtmbuf(mb, bpos,
 1089                             (const char *)VTONFS(v)->n_fhp,
 1090                             VTONFS(v)->n_fhsize);
 1091                         if (t1 != 0)
 1092                                 return t1;
 1093                 }
 1094         } else {
 1095                 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
 1096                 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
 1097         }
 1098         return 0;
 1099 }
 1100 
 1101 void
 1102 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
 1103     caddr_t *bpos)
 1104 {
 1105         u_int32_t *tl;
 1106 
 1107         if (va->va_mode != (mode_t)VNOVAL) {
 1108                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1109                 *tl++ = nfs_true;
 1110                 *tl = txdr_unsigned(va->va_mode);
 1111         } else {
 1112                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1113                 *tl = nfs_false;
 1114         }
 1115         if (full && va->va_uid != (uid_t)VNOVAL) {
 1116                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1117                 *tl++ = nfs_true;
 1118                 *tl = txdr_unsigned(va->va_uid);
 1119         } else {
 1120                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1121                 *tl = nfs_false;
 1122         }
 1123         if (full && va->va_gid != (gid_t)VNOVAL) {
 1124                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1125                 *tl++ = nfs_true;
 1126                 *tl = txdr_unsigned(va->va_gid);
 1127         } else {
 1128                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1129                 *tl = nfs_false;
 1130         }
 1131         if (full && va->va_size != VNOVAL) {
 1132                 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1133                 *tl++ = nfs_true;
 1134                 txdr_hyper(va->va_size, tl);
 1135         } else {
 1136                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1137                 *tl = nfs_false;
 1138         }
 1139         if (va->va_atime.tv_sec != VNOVAL) {
 1140                 if ((va->va_vaflags & VA_UTIMES_NULL) == 0) {
 1141                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1142                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1143                         txdr_nfsv3time(&va->va_atime, tl);
 1144                 } else {
 1145                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1146                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1147                 }
 1148         } else {
 1149                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1150                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1151         }
 1152         if (va->va_mtime.tv_sec != VNOVAL) {
 1153                 if ((va->va_vaflags & VA_UTIMES_NULL) == 0) {
 1154                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1155                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1156                         txdr_nfsv3time(&va->va_mtime, tl);
 1157                 } else {
 1158                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1159                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1160                 }
 1161         } else {
 1162                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1163                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1164         }
 1165 }

Cache object: d7e8b75f43ee4c25b961f845a7d2afd1


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