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("$FreeBSD$");
   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 <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/kernel.h>
   47 #include <sys/bio.h>
   48 #include <sys/buf.h>
   49 #include <sys/proc.h>
   50 #include <sys/mount.h>
   51 #include <sys/vnode.h>
   52 #include <sys/namei.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/socket.h>
   55 #include <sys/stat.h>
   56 #include <sys/malloc.h>
   57 #include <sys/sysent.h>
   58 #include <sys/syscall.h>
   59 #include <sys/sysproto.h>
   60 
   61 #include <vm/vm.h>
   62 #include <vm/vm_object.h>
   63 #include <vm/vm_extern.h>
   64 #include <vm/uma.h>
   65 
   66 #include <rpc/rpcclnt.h>
   67 
   68 #include <nfs/rpcv2.h>
   69 #include <nfs/nfsproto.h>
   70 #include <nfsclient/nfs.h>
   71 #include <nfsclient/nfsnode.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 /*
   85  * Data items converted to xdr at startup, since they are constant
   86  * This is kinda hokey, but may save a little time doing byte swaps
   87  */
   88 u_int32_t       nfs_xdrneg1;
   89 u_int32_t       rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
   90                     rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
   91 u_int32_t       nfs_true, nfs_false;
   92 
   93 /* And other global data */
   94 u_int32_t nfs_xid = 0;
   95 static enum vtype nv2tov_type[8]= {
   96         VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON,  VNON
   97 };
   98 
   99 int             nfs_ticks;
  100 int             nfs_pbuf_freecnt = -1;  /* start out unlimited */
  101 
  102 struct nfs_reqq nfs_reqq;
  103 struct mtx nfs_reqq_mtx;
  104 struct nfs_bufq nfs_bufq;
  105 struct mtx nfs_xid_mtx;
  106 
  107 /*
  108  * and the reverse mapping from generic to Version 2 procedure numbers
  109  */
  110 int nfsv2_procid[NFS_NPROCS] = {
  111         NFSV2PROC_NULL,
  112         NFSV2PROC_GETATTR,
  113         NFSV2PROC_SETATTR,
  114         NFSV2PROC_LOOKUP,
  115         NFSV2PROC_NOOP,
  116         NFSV2PROC_READLINK,
  117         NFSV2PROC_READ,
  118         NFSV2PROC_WRITE,
  119         NFSV2PROC_CREATE,
  120         NFSV2PROC_MKDIR,
  121         NFSV2PROC_SYMLINK,
  122         NFSV2PROC_CREATE,
  123         NFSV2PROC_REMOVE,
  124         NFSV2PROC_RMDIR,
  125         NFSV2PROC_RENAME,
  126         NFSV2PROC_LINK,
  127         NFSV2PROC_READDIR,
  128         NFSV2PROC_NOOP,
  129         NFSV2PROC_STATFS,
  130         NFSV2PROC_NOOP,
  131         NFSV2PROC_NOOP,
  132         NFSV2PROC_NOOP,
  133         NFSV2PROC_NOOP,
  134 };
  135 
  136 LIST_HEAD(nfsnodehashhead, nfsnode);
  137 
  138 /*
  139  * Create the header for an rpc request packet
  140  * The hsiz is the size of the rest of the nfs request header.
  141  * (just used to decide if a cluster is a good idea)
  142  */
  143 struct mbuf *
  144 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
  145 {
  146         struct mbuf *mb;
  147 
  148         MGET(mb, M_TRYWAIT, MT_DATA);
  149         if (hsiz >= MINCLSIZE)
  150                 MCLGET(mb, M_TRYWAIT);
  151         mb->m_len = 0;
  152         return (mb);
  153 }
  154 
  155 /*
  156  * Build the RPC header and fill in the authorization info.
  157  * The authorization string argument is only used when the credentials
  158  * come from outside of the kernel.
  159  * Returns the head of the mbuf list.
  160  */
  161 struct mbuf *
  162 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type,
  163     int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp,
  164     u_int32_t **xidpp)
  165 {
  166         struct mbuf *mb;
  167         u_int32_t *tl;
  168         caddr_t bpos;
  169         int i;
  170         struct mbuf *mreq;
  171         int grpsiz, authsiz;
  172 
  173         authsiz = nfsm_rndup(auth_len);
  174         MGETHDR(mb, M_TRYWAIT, MT_DATA);
  175         if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) {
  176                 MCLGET(mb, M_TRYWAIT);
  177         } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) {
  178                 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
  179         } else {
  180                 MH_ALIGN(mb, 8 * NFSX_UNSIGNED);
  181         }
  182         mb->m_len = 0;
  183         mreq = mb;
  184         bpos = mtod(mb, caddr_t);
  185 
  186         /*
  187          * First the RPC header.
  188          */
  189         tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED);
  190 
  191         mtx_lock(&nfs_xid_mtx);
  192         /* Get a pretty random xid to start with */
  193         if (!nfs_xid)
  194                 nfs_xid = random();
  195         /*
  196          * Skip zero xid if it should ever happen.
  197          */
  198         if (++nfs_xid == 0)
  199                 nfs_xid++;
  200 
  201         *xidpp = tl;
  202         *tl++ = txdr_unsigned(nfs_xid);
  203         mtx_unlock(&nfs_xid_mtx);
  204         *tl++ = rpc_call;
  205         *tl++ = rpc_vers;
  206         *tl++ = txdr_unsigned(NFS_PROG);
  207         if (nmflag & NFSMNT_NFSV3) {
  208                 *tl++ = txdr_unsigned(NFS_VER3);
  209                 *tl++ = txdr_unsigned(procid);
  210         } else {
  211                 *tl++ = txdr_unsigned(NFS_VER2);
  212                 *tl++ = txdr_unsigned(nfsv2_procid[procid]);
  213         }
  214 
  215         /*
  216          * And then the authorization cred.
  217          */
  218         *tl++ = txdr_unsigned(auth_type);
  219         *tl = txdr_unsigned(authsiz);
  220         switch (auth_type) {
  221         case RPCAUTH_UNIX:
  222                 tl = nfsm_build(u_int32_t *, auth_len);
  223                 *tl++ = 0;              /* stamp ?? */
  224                 *tl++ = 0;              /* NULL hostname */
  225                 *tl++ = txdr_unsigned(cr->cr_uid);
  226                 *tl++ = txdr_unsigned(cr->cr_groups[0]);
  227                 grpsiz = (auth_len >> 2) - 5;
  228                 *tl++ = txdr_unsigned(grpsiz);
  229                 for (i = 1; i <= grpsiz; i++)
  230                         *tl++ = txdr_unsigned(cr->cr_groups[i]);
  231                 break;
  232         }
  233 
  234         /*
  235          * And the verifier...
  236          */
  237         tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
  238         *tl++ = txdr_unsigned(RPCAUTH_NULL);
  239         *tl = 0;
  240         mb->m_next = mrest;
  241         mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len;
  242         mreq->m_pkthdr.rcvif = NULL;
  243         *mbp = mb;
  244         return (mreq);
  245 }
  246 
  247 /*
  248  * copies a uio scatter/gather list to an mbuf chain.
  249  * NOTE: can ony handle iovcnt == 1
  250  */
  251 int
  252 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
  253 {
  254         char *uiocp;
  255         struct mbuf *mp, *mp2;
  256         int xfer, left, mlen;
  257         int uiosiz, clflg, rem;
  258         char *cp;
  259 
  260 #ifdef DIAGNOSTIC
  261         if (uiop->uio_iovcnt != 1)
  262                 panic("nfsm_uiotombuf: iovcnt != 1");
  263 #endif
  264 
  265         if (siz > MLEN)         /* or should it >= MCLBYTES ?? */
  266                 clflg = 1;
  267         else
  268                 clflg = 0;
  269         rem = nfsm_rndup(siz)-siz;
  270         mp = mp2 = *mq;
  271         while (siz > 0) {
  272                 left = uiop->uio_iov->iov_len;
  273                 uiocp = uiop->uio_iov->iov_base;
  274                 if (left > siz)
  275                         left = siz;
  276                 uiosiz = left;
  277                 while (left > 0) {
  278                         mlen = M_TRAILINGSPACE(mp);
  279                         if (mlen == 0) {
  280                                 MGET(mp, M_TRYWAIT, MT_DATA);
  281                                 if (clflg)
  282                                         MCLGET(mp, M_TRYWAIT);
  283                                 mp->m_len = 0;
  284                                 mp2->m_next = mp;
  285                                 mp2 = mp;
  286                                 mlen = M_TRAILINGSPACE(mp);
  287                         }
  288                         xfer = (left > mlen) ? mlen : left;
  289 #ifdef notdef
  290                         /* Not Yet.. */
  291                         if (uiop->uio_iov->iov_op != NULL)
  292                                 (*(uiop->uio_iov->iov_op))
  293                                 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  294                         else
  295 #endif
  296                         if (uiop->uio_segflg == UIO_SYSSPACE)
  297                                 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  298                         else
  299                                 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  300                         mp->m_len += xfer;
  301                         left -= xfer;
  302                         uiocp += xfer;
  303                         uiop->uio_offset += xfer;
  304                         uiop->uio_resid -= xfer;
  305                 }
  306                 uiop->uio_iov->iov_base =
  307                     (char *)uiop->uio_iov->iov_base + uiosiz;
  308                 uiop->uio_iov->iov_len -= uiosiz;
  309                 siz -= uiosiz;
  310         }
  311         if (rem > 0) {
  312                 if (rem > M_TRAILINGSPACE(mp)) {
  313                         MGET(mp, M_TRYWAIT, MT_DATA);
  314                         mp->m_len = 0;
  315                         mp2->m_next = mp;
  316                 }
  317                 cp = mtod(mp, caddr_t)+mp->m_len;
  318                 for (left = 0; left < rem; left++)
  319                         *cp++ = '\0';
  320                 mp->m_len += rem;
  321                 *bpos = cp;
  322         } else
  323                 *bpos = mtod(mp, caddr_t)+mp->m_len;
  324         *mq = mp;
  325         return (0);
  326 }
  327 
  328 /*
  329  * Copy a string into mbufs for the hard cases...
  330  */
  331 int
  332 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
  333 {
  334         struct mbuf *m1 = NULL, *m2;
  335         long left, xfer, len, tlen;
  336         u_int32_t *tl;
  337         int putsize;
  338 
  339         putsize = 1;
  340         m2 = *mb;
  341         left = M_TRAILINGSPACE(m2);
  342         if (left > 0) {
  343                 tl = ((u_int32_t *)(*bpos));
  344                 *tl++ = txdr_unsigned(siz);
  345                 putsize = 0;
  346                 left -= NFSX_UNSIGNED;
  347                 m2->m_len += NFSX_UNSIGNED;
  348                 if (left > 0) {
  349                         bcopy(cp, (caddr_t) tl, left);
  350                         siz -= left;
  351                         cp += left;
  352                         m2->m_len += left;
  353                         left = 0;
  354                 }
  355         }
  356         /* Loop around adding mbufs */
  357         while (siz > 0) {
  358                 MGET(m1, M_TRYWAIT, MT_DATA);
  359                 if (siz > MLEN)
  360                         MCLGET(m1, M_TRYWAIT);
  361                 m1->m_len = NFSMSIZ(m1);
  362                 m2->m_next = m1;
  363                 m2 = m1;
  364                 tl = mtod(m1, u_int32_t *);
  365                 tlen = 0;
  366                 if (putsize) {
  367                         *tl++ = txdr_unsigned(siz);
  368                         m1->m_len -= NFSX_UNSIGNED;
  369                         tlen = NFSX_UNSIGNED;
  370                         putsize = 0;
  371                 }
  372                 if (siz < m1->m_len) {
  373                         len = nfsm_rndup(siz);
  374                         xfer = siz;
  375                         if (xfer < len)
  376                                 *(tl+(xfer>>2)) = 0;
  377                 } else {
  378                         xfer = len = m1->m_len;
  379                 }
  380                 bcopy(cp, (caddr_t) tl, xfer);
  381                 m1->m_len = len+tlen;
  382                 siz -= xfer;
  383                 cp += xfer;
  384         }
  385         *mb = m1;
  386         *bpos = mtod(m1, caddr_t)+m1->m_len;
  387         return (0);
  388 }
  389 
  390 /*
  391  * Called once to initialize data structures...
  392  */
  393 int
  394 nfs_init(struct vfsconf *vfsp)
  395 {
  396         int i;
  397 
  398         nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
  399             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
  400         rpc_vers = txdr_unsigned(RPC_VER2);
  401         rpc_call = txdr_unsigned(RPC_CALL);
  402         rpc_reply = txdr_unsigned(RPC_REPLY);
  403         rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
  404         rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
  405         rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
  406         rpc_autherr = txdr_unsigned(RPC_AUTHERR);
  407         rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
  408         nfs_true = txdr_unsigned(TRUE);
  409         nfs_false = txdr_unsigned(FALSE);
  410         nfs_xdrneg1 = txdr_unsigned(-1);
  411         nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
  412         if (nfs_ticks < 1)
  413                 nfs_ticks = 1;
  414         /* Ensure async daemons disabled */
  415         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  416                 nfs_iodwant[i] = NULL;
  417                 nfs_iodmount[i] = NULL;
  418         }
  419         nfs_nhinit();                   /* Init the nfsnode table */
  420 
  421         /*
  422          * Initialize reply list and start timer
  423          */
  424         TAILQ_INIT(&nfs_reqq);
  425         callout_init(&nfs_callout, CALLOUT_MPSAFE);
  426         mtx_init(&nfs_reqq_mtx, "NFS reqq lock", NULL, MTX_DEF);
  427         mtx_init(&nfs_iod_mtx, "NFS iod lock", NULL, MTX_DEF);
  428         mtx_init(&nfs_xid_mtx, "NFS xid lock", NULL, MTX_DEF);
  429 
  430         nfs_pbuf_freecnt = nswbuf / 2 + 1;
  431 
  432         return (0);
  433 }
  434 
  435 int
  436 nfs_uninit(struct vfsconf *vfsp)
  437 {
  438         int i;
  439 
  440         callout_stop(&nfs_callout);
  441 
  442         KASSERT(TAILQ_EMPTY(&nfs_reqq),
  443             ("nfs_uninit: request queue not empty"));
  444 
  445         /*
  446          * Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup
  447          * any sleeping nfsiods so they check nfs_iodmax and exit.
  448          */
  449         mtx_lock(&nfs_iod_mtx);
  450         nfs_iodmax = 0;
  451         for (i = 0; i < nfs_numasync; i++)
  452                 if (nfs_iodwant[i])
  453                         wakeup(&nfs_iodwant[i]);
  454         /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */
  455         while (nfs_numasync)
  456                 msleep(&nfs_numasync, &nfs_iod_mtx, PWAIT, "ioddie", 0);
  457         mtx_unlock(&nfs_iod_mtx);
  458         nfs_nhuninit();
  459         uma_zdestroy(nfsmount_zone);
  460         return (0);
  461 }
  462 
  463 void 
  464 nfs_dircookie_lock(struct nfsnode *np)
  465 {
  466         mtx_lock(&np->n_mtx);
  467         while (np->n_flag & NDIRCOOKIELK)
  468                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  469         np->n_flag |= NDIRCOOKIELK;
  470         mtx_unlock(&np->n_mtx);
  471 }
  472 
  473 void 
  474 nfs_dircookie_unlock(struct nfsnode *np)
  475 {
  476         mtx_lock(&np->n_mtx);
  477         np->n_flag &= ~NDIRCOOKIELK;
  478         wakeup(&np->n_flag);
  479         mtx_unlock(&np->n_mtx);
  480 }
  481 
  482 int
  483 nfs_upgrade_vnlock(struct vnode *vp, struct thread *td)
  484 {
  485         int old_lock;
  486         
  487         if ((old_lock = VOP_ISLOCKED(vp, td)) != LK_EXCLUSIVE) {
  488                 if (old_lock == LK_SHARED) {
  489                         /* Upgrade to exclusive lock, this might block */
  490                         vn_lock(vp, LK_UPGRADE | LK_RETRY, td);
  491                 } else {
  492                         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  493                 }
  494         }
  495         return old_lock;
  496 }
  497 
  498 void
  499 nfs_downgrade_vnlock(struct vnode *vp, struct thread *td, int old_lock)
  500 {
  501         if (old_lock != LK_EXCLUSIVE) {
  502                 if (old_lock == LK_SHARED) {
  503                         /* Downgrade from exclusive lock, this might block */
  504                         vn_lock(vp, LK_DOWNGRADE, td);
  505                 } else {
  506                         VOP_UNLOCK(vp, 0, td);
  507                 }
  508         }
  509 }
  510 
  511 void
  512 nfs_printf(const char *fmt, ...)
  513 {
  514         va_list ap;
  515 
  516         mtx_lock(&Giant);
  517         va_start(ap, fmt);
  518         printf(fmt, ap);
  519         va_end(ap);
  520         mtx_unlock(&Giant);
  521 }
  522 
  523 /*
  524  * Attribute cache routines.
  525  * nfs_loadattrcache() - loads or updates the cache contents from attributes
  526  *      that are on the mbuf list
  527  * nfs_getattrcache() - returns valid attributes if found in cache, returns
  528  *      error otherwise
  529  */
  530 
  531 /*
  532  * Load the attribute cache (that lives in the nfsnode entry) with
  533  * the values on the mbuf list and
  534  * Iff vap not NULL
  535  *    copy the attributes to *vaper
  536  */
  537 int
  538 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
  539                   struct vattr *vaper, int dontshrink)
  540 {
  541         struct vnode *vp = *vpp;
  542         struct vattr *vap;
  543         struct nfs_fattr *fp;
  544         struct nfsnode *np;
  545         int32_t t1;
  546         caddr_t cp2;
  547         int rdev;
  548         struct mbuf *md;
  549         enum vtype vtyp;
  550         u_short vmode;
  551         struct timespec mtime, mtime_save;
  552         int v3 = NFS_ISV3(vp);
  553         struct thread *td = curthread;
  554 
  555         md = *mdp;
  556         t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
  557         cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_TRYWAIT);
  558         if (cp2 == NULL)
  559                 return EBADRPC;
  560         fp = (struct nfs_fattr *)cp2;
  561         if (v3) {
  562                 vtyp = nfsv3tov_type(fp->fa_type);
  563                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  564                 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
  565                         fxdr_unsigned(int, fp->fa3_rdev.specdata2));
  566                 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
  567         } else {
  568                 vtyp = nfsv2tov_type(fp->fa_type);
  569                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  570                 /*
  571                  * XXX
  572                  *
  573                  * The duplicate information returned in fa_type and fa_mode
  574                  * is an ambiguity in the NFS version 2 protocol.
  575                  *
  576                  * VREG should be taken literally as a regular file.  If a
  577                  * server intents to return some type information differently
  578                  * in the upper bits of the mode field (e.g. for sockets, or
  579                  * FIFOs), NFSv2 mandates fa_type to be VNON.  Anyway, we
  580                  * leave the examination of the mode bits even in the VREG
  581                  * case to avoid breakage for bogus servers, but we make sure
  582                  * that there are actually type bits set in the upper part of
  583                  * fa_mode (and failing that, trust the va_type field).
  584                  *
  585                  * NFSv3 cleared the issue, and requires fa_mode to not
  586                  * contain any type information (while also introduing sockets
  587                  * and FIFOs for fa_type).
  588                  */
  589                 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
  590                         vtyp = IFTOVT(vmode);
  591                 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
  592                 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
  593 
  594                 /*
  595                  * Really ugly NFSv2 kludge.
  596                  */
  597                 if (vtyp == VCHR && rdev == 0xffffffff)
  598                         vtyp = VFIFO;
  599         }
  600 
  601         /*
  602          * If v_type == VNON it is a new node, so fill in the v_type,
  603          * n_mtime fields. Check to see if it represents a special
  604          * device, and if so, check for a possible alias. Once the
  605          * correct vnode has been obtained, fill in the rest of the
  606          * information.
  607          */
  608         np = VTONFS(vp);
  609         mtx_lock(&np->n_mtx);
  610         if (vp->v_type != vtyp) {
  611                 vp->v_type = vtyp;
  612                 if (vp->v_type == VFIFO)
  613                         vp->v_op = &nfs_fifoops;
  614                 np->n_mtime = mtime;
  615         }
  616         vap = &np->n_vattr;
  617         vap->va_type = vtyp;
  618         vap->va_mode = (vmode & 07777);
  619         vap->va_rdev = rdev;
  620         mtime_save = vap->va_mtime;
  621         vap->va_mtime = mtime;
  622         vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  623         if (v3) {
  624                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  625                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  626                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  627                 vap->va_size = fxdr_hyper(&fp->fa3_size);
  628                 vap->va_blocksize = NFS_FABLKSIZE;
  629                 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
  630                 vap->va_fileid = fxdr_unsigned(int32_t,
  631                     fp->fa3_fileid.nfsuquad[1]);
  632                 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
  633                 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
  634                 vap->va_flags = 0;
  635                 vap->va_filerev = 0;
  636         } else {
  637                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  638                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  639                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  640                 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
  641                 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
  642                 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
  643                     * NFS_FABLKSIZE;
  644                 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
  645                 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
  646                 vap->va_flags = 0;
  647                 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
  648                     fp->fa2_ctime.nfsv2_sec);
  649                 vap->va_ctime.tv_nsec = 0;
  650                 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
  651                 vap->va_filerev = 0;
  652         }
  653         np->n_attrstamp = time_second;
  654         /* Timestamp the NFS otw getattr fetch */
  655         if (td->td_proc) {
  656                 np->n_ac_ts_tid = td->td_tid;
  657                 np->n_ac_ts_pid = td->td_proc->p_pid;
  658                 np->n_ac_ts_syscalls = td->td_syscalls;
  659         } else
  660                 bzero(&np->n_ac_ts, sizeof(struct nfs_attrcache_timestamp));
  661         
  662         if (vap->va_size != np->n_size) {
  663                 if (vap->va_type == VREG) {
  664                         if (dontshrink && vap->va_size < np->n_size) {
  665                                 /*
  666                                  * We've been told not to shrink the file;
  667                                  * zero np->n_attrstamp to indicate that
  668                                  * the attributes are stale.
  669                                  */
  670                                 vap->va_size = np->n_size;
  671                                 np->n_attrstamp = 0;
  672                         } else if (np->n_flag & NMODIFIED) {
  673                                 /*
  674                                  * We've modified the file: Use the larger
  675                                  * of our size, and the server's size.
  676                                  */
  677                                 if (vap->va_size < np->n_size) {
  678                                         vap->va_size = np->n_size;
  679                                 } else {
  680                                         np->n_size = vap->va_size;
  681                                         np->n_flag |= NSIZECHANGED;
  682                                 }
  683                         } else {
  684                                 np->n_size = vap->va_size;
  685                                 np->n_flag |= NSIZECHANGED;
  686                         }
  687                         vnode_pager_setsize(vp, np->n_size);
  688                 } else {
  689                         np->n_size = vap->va_size;
  690                 }
  691         }
  692         /*
  693          * The following checks are added to prevent a race between (say)
  694          * a READDIR+ and a WRITE. 
  695          * READDIR+, WRITE requests sent out.
  696          * READDIR+ resp, WRITE resp received on client.
  697          * However, the WRITE resp was handled before the READDIR+ resp
  698          * causing the post op attrs from the write to be loaded first
  699          * and the attrs from the READDIR+ to be loaded later. If this 
  700          * happens, we have stale attrs loaded into the attrcache.
  701          * We detect this by for the mtime moving back. We invalidate the 
  702          * attrcache when this happens.
  703          */
  704         if (timespeccmp(&mtime_save, &vap->va_mtime, >))
  705                 /* Size changed or mtime went backwards */
  706                 np->n_attrstamp = 0;
  707         if (vaper != NULL) {
  708                 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  709                 if (np->n_flag & NCHG) {
  710                         if (np->n_flag & NACC)
  711                                 vaper->va_atime = np->n_atim;
  712                         if (np->n_flag & NUPD)
  713                                 vaper->va_mtime = np->n_mtim;
  714                 }
  715         }
  716         mtx_unlock(&np->n_mtx);
  717         return (0);
  718 }
  719 
  720 #ifdef NFS_ACDEBUG
  721 #include <sys/sysctl.h>
  722 SYSCTL_DECL(_vfs_nfs);
  723 static int nfs_acdebug;
  724 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  725 #endif
  726 
  727 /*
  728  * Check the time stamp
  729  * If the cache is valid, copy contents to *vap and return 0
  730  * otherwise return an error
  731  */
  732 int
  733 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
  734 {
  735         struct nfsnode *np;
  736         struct vattr *vap;
  737         struct nfsmount *nmp;
  738         int timeo;
  739         
  740         np = VTONFS(vp);
  741         vap = &np->n_vattr;
  742         nmp = VFSTONFS(vp->v_mount);
  743 #ifdef NFS_ACDEBUG
  744         mtx_lock(&Giant);       /* nfs_printf() */
  745 #endif
  746         mtx_lock(&np->n_mtx);
  747         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  748         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  749 
  750 #ifdef NFS_ACDEBUG
  751         if (nfs_acdebug>1)
  752                 nfs_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  753 #endif
  754 
  755         if (vap->va_type == VDIR) {
  756                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  757                         timeo = nmp->nm_acdirmin;
  758                 else if (timeo > nmp->nm_acdirmax)
  759                         timeo = nmp->nm_acdirmax;
  760         } else {
  761                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  762                         timeo = nmp->nm_acregmin;
  763                 else if (timeo > nmp->nm_acregmax)
  764                         timeo = nmp->nm_acregmax;
  765         }
  766 
  767 #ifdef NFS_ACDEBUG
  768         if (nfs_acdebug > 2)
  769                 nfs_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  770                            nmp->nm_acregmin, nmp->nm_acregmax,
  771                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  772 
  773         if (nfs_acdebug)
  774                 nfs_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  775                            (time_second - np->n_attrstamp), timeo);
  776 #endif
  777 
  778         if ((time_second - np->n_attrstamp) >= timeo) {
  779                 nfsstats.attrcache_misses++;
  780                 mtx_unlock(&np->n_mtx);
  781                 return( ENOENT);
  782         }
  783         nfsstats.attrcache_hits++;
  784         if (vap->va_size != np->n_size) {
  785                 if (vap->va_type == VREG) {
  786                         if (np->n_flag & NMODIFIED) {
  787                                 if (vap->va_size < np->n_size)
  788                                         vap->va_size = np->n_size;
  789                                 else
  790                                         np->n_size = vap->va_size;
  791                         } else {
  792                                 np->n_size = vap->va_size;
  793                         }
  794                         vnode_pager_setsize(vp, np->n_size);
  795                 } else {
  796                         np->n_size = vap->va_size;
  797                 }
  798         }
  799         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  800         if (np->n_flag & NCHG) {
  801                 if (np->n_flag & NACC)
  802                         vaper->va_atime = np->n_atim;
  803                 if (np->n_flag & NUPD)
  804                         vaper->va_mtime = np->n_mtim;
  805         }
  806         mtx_unlock(&np->n_mtx);
  807 #ifdef NFS_ACDEBUG
  808         mtx_unlock(&Giant);     /* nfs_printf() */
  809 #endif
  810         return (0);
  811 }
  812 
  813 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  814 /*
  815  * This function finds the directory cookie that corresponds to the
  816  * logical byte offset given.
  817  */
  818 nfsuint64 *
  819 nfs_getcookie(struct nfsnode *np, off_t off, int add)
  820 {
  821         struct nfsdmap *dp, *dp2;
  822         int pos;
  823         nfsuint64 *retval = NULL;
  824         
  825         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  826         if (pos == 0 || off < 0) {
  827 #ifdef DIAGNOSTIC
  828                 if (add)
  829                         panic("nfs getcookie add at <= 0");
  830 #endif
  831                 return (&nfs_nullcookie);
  832         }
  833         pos--;
  834         dp = LIST_FIRST(&np->n_cookies);
  835         if (!dp) {
  836                 if (add) {
  837                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  838                                 M_NFSDIROFF, M_WAITOK);
  839                         dp->ndm_eocookie = 0;
  840                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  841                 } else
  842                         goto out;
  843         }
  844         while (pos >= NFSNUMCOOKIES) {
  845                 pos -= NFSNUMCOOKIES;
  846                 if (LIST_NEXT(dp, ndm_list)) {
  847                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  848                             pos >= dp->ndm_eocookie)
  849                                 goto out;
  850                         dp = LIST_NEXT(dp, ndm_list);
  851                 } else if (add) {
  852                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  853                                 M_NFSDIROFF, M_WAITOK);
  854                         dp2->ndm_eocookie = 0;
  855                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  856                         dp = dp2;
  857                 } else
  858                         goto out;
  859         }
  860         if (pos >= dp->ndm_eocookie) {
  861                 if (add)
  862                         dp->ndm_eocookie = pos + 1;
  863                 else
  864                         goto out;
  865         }
  866         retval = &dp->ndm_cookies[pos];
  867 out:
  868         return (retval);
  869 }
  870 
  871 /*
  872  * Invalidate cached directory information, except for the actual directory
  873  * blocks (which are invalidated separately).
  874  * Done mainly to avoid the use of stale offset cookies.
  875  */
  876 void
  877 nfs_invaldir(struct vnode *vp)
  878 {
  879         struct nfsnode *np = VTONFS(vp);
  880 
  881 #ifdef DIAGNOSTIC
  882         if (vp->v_type != VDIR)
  883                 panic("nfs: invaldir not dir");
  884 #endif
  885         nfs_dircookie_lock(np);
  886         np->n_direofoffset = 0;
  887         np->n_cookieverf.nfsuquad[0] = 0;
  888         np->n_cookieverf.nfsuquad[1] = 0;
  889         if (LIST_FIRST(&np->n_cookies))
  890                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  891         nfs_dircookie_unlock(np);
  892 }
  893 
  894 /*
  895  * The write verifier has changed (probably due to a server reboot), so all
  896  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  897  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  898  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  899  * mount point.
  900  *
  901  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  902  * writes are not clusterable.
  903  */
  904 void
  905 nfs_clearcommit(struct mount *mp)
  906 {
  907         struct vnode *vp, *nvp;
  908         struct buf *bp, *nbp;
  909         int s;
  910 
  911         s = splbio();
  912         MNT_ILOCK(mp);
  913         MNT_VNODE_FOREACH(vp, mp, nvp) {
  914                 VI_LOCK(vp);
  915                 if (vp->v_iflag & VI_DOOMED) {
  916                         VI_UNLOCK(vp);
  917                         continue;
  918                 }
  919                 MNT_IUNLOCK(mp);
  920                 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
  921                         if (BUF_REFCNT(bp) == 0 &&
  922                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  923                                 == (B_DELWRI | B_NEEDCOMMIT))
  924                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  925                 }
  926                 VI_UNLOCK(vp);
  927                 MNT_ILOCK(mp);
  928         }
  929         MNT_IUNLOCK(mp);
  930         splx(s);
  931 }
  932 
  933 /*
  934  * Helper functions for former macros.  Some of these should be
  935  * moved to their callers.
  936  */
  937 
  938 int
  939 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
  940     struct mbuf **md, caddr_t *dpos)
  941 {
  942         struct nfsnode *ttnp;
  943         struct vnode *ttvp;
  944         nfsfh_t *ttfhp;
  945         u_int32_t *tl;
  946         int ttfhsize;
  947         int t1;
  948 
  949         if (v3) {
  950                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  951                 if (tl == NULL)
  952                         return EBADRPC;
  953                 *f = fxdr_unsigned(int, *tl);
  954         } else
  955                 *f = 1;
  956         if (*f) {
  957                 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
  958                 if (t1 != 0)
  959                         return t1;
  960                 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp, LK_EXCLUSIVE);
  961                 if (t1 != 0)
  962                         return t1;
  963                 *v = NFSTOV(ttnp);
  964         }
  965         if (v3) {
  966                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  967                 if (tl == NULL)
  968                         return EBADRPC;
  969                 if (*f)
  970                         *f = fxdr_unsigned(int, *tl);
  971                 else if (fxdr_unsigned(int, *tl))
  972                         nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
  973         }
  974         if (*f) {
  975                 ttvp = *v;
  976                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
  977                 if (t1)
  978                         return t1;
  979                 *v = ttvp;
  980         }
  981         return 0;
  982 }
  983 
  984 int
  985 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
  986 {
  987         u_int32_t *tl;
  988 
  989         if (v3) {
  990                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  991                 if (tl == NULL)
  992                         return EBADRPC;
  993                 *s = fxdr_unsigned(int, *tl);
  994                 if (*s <= 0 || *s > NFSX_V3FHMAX)
  995                         return EBADRPC;
  996         } else
  997                 *s = NFSX_V2FH;
  998         *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
  999         if (*f == NULL)
 1000                 return EBADRPC;
 1001         else
 1002                 return 0;
 1003 }
 1004 
 1005 
 1006 int
 1007 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
 1008                  caddr_t *dpos)
 1009 {
 1010         int t1;
 1011 
 1012         struct vnode *ttvp = *v;
 1013         t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
 1014         if (t1 != 0)
 1015                 return t1;
 1016         *v = ttvp;
 1017         return 0;
 1018 }
 1019 
 1020 int
 1021 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md,
 1022                     caddr_t *dpos)
 1023 {
 1024         u_int32_t *tl;
 1025         int t1;
 1026 
 1027         struct vnode *ttvp = *v;
 1028         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
 1029         if (tl == NULL)
 1030                 return EBADRPC;
 1031         *f = fxdr_unsigned(int, *tl);
 1032         if (*f != 0) {
 1033                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1);
 1034                 if (t1 != 0) {
 1035                         *f = 0;
 1036                         return t1;
 1037                 }
 1038                 *v = ttvp;
 1039         }
 1040         return 0;
 1041 }
 1042 
 1043 int
 1044 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
 1045 {
 1046         u_int32_t *tl;
 1047         int ttattrf, ttretf = 0;
 1048         int t1;
 1049 
 1050         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
 1051         if (tl == NULL)
 1052                 return EBADRPC;
 1053         if (*tl == nfs_true) {
 1054                 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
 1055                 if (tl == NULL)
 1056                         return EBADRPC;
 1057                 mtx_lock(&(VTONFS(*v))->n_mtx);
 1058                 if (*f)
 1059                         ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) && 
 1060                                   VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3))); 
 1061                 mtx_unlock(&(VTONFS(*v))->n_mtx);
 1062         }
 1063         t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos);
 1064         if (t1)
 1065                 return t1;
 1066         if (*f)
 1067                 *f = ttretf;
 1068         else
 1069                 *f = ttattrf;
 1070         return 0;
 1071 }
 1072 
 1073 int
 1074 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
 1075 {
 1076         u_int32_t *tl;
 1077         int t1;
 1078 
 1079         if (s > m)
 1080                 return ENAMETOOLONG;
 1081         t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
 1082         if (t1 <= M_TRAILINGSPACE(*mb)) {
 1083                 tl = nfsm_build_xx(t1, mb, bpos);
 1084                 *tl++ = txdr_unsigned(s);
 1085                 *(tl + ((t1 >> 2) - 2)) = 0;
 1086                 bcopy(a, tl, s);
 1087         } else {
 1088                 t1 = nfsm_strtmbuf(mb, bpos, a, s);
 1089                 if (t1 != 0)
 1090                         return t1;
 1091         }
 1092         return 0;
 1093 }
 1094 
 1095 int
 1096 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
 1097 {
 1098         u_int32_t *tl;
 1099         int t1;
 1100         caddr_t cp;
 1101 
 1102         if (v3) {
 1103                 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
 1104                 if (t1 < M_TRAILINGSPACE(*mb)) {
 1105                         tl = nfsm_build_xx(t1, mb, bpos);
 1106                         *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
 1107                         *(tl + ((t1 >> 2) - 2)) = 0;
 1108                         bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
 1109                 } else {
 1110                         t1 = nfsm_strtmbuf(mb, bpos,
 1111                             (const char *)VTONFS(v)->n_fhp,
 1112                             VTONFS(v)->n_fhsize);
 1113                         if (t1 != 0)
 1114                                 return t1;
 1115                 }
 1116         } else {
 1117                 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
 1118                 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
 1119         }
 1120         return 0;
 1121 }
 1122 
 1123 void
 1124 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
 1125     caddr_t *bpos)
 1126 {
 1127         u_int32_t *tl;
 1128 
 1129         if (va->va_mode != (mode_t)VNOVAL) {
 1130                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1131                 *tl++ = nfs_true;
 1132                 *tl = txdr_unsigned(va->va_mode);
 1133         } else {
 1134                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1135                 *tl = nfs_false;
 1136         }
 1137         if (full && va->va_uid != (uid_t)VNOVAL) {
 1138                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1139                 *tl++ = nfs_true;
 1140                 *tl = txdr_unsigned(va->va_uid);
 1141         } else {
 1142                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1143                 *tl = nfs_false;
 1144         }
 1145         if (full && va->va_gid != (gid_t)VNOVAL) {
 1146                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1147                 *tl++ = nfs_true;
 1148                 *tl = txdr_unsigned(va->va_gid);
 1149         } else {
 1150                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1151                 *tl = nfs_false;
 1152         }
 1153         if (full && va->va_size != VNOVAL) {
 1154                 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1155                 *tl++ = nfs_true;
 1156                 txdr_hyper(va->va_size, tl);
 1157         } else {
 1158                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1159                 *tl = nfs_false;
 1160         }
 1161         if (va->va_atime.tv_sec != VNOVAL) {
 1162                 if (va->va_atime.tv_sec != time_second) {
 1163                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1164                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1165                         txdr_nfsv3time(&va->va_atime, tl);
 1166                 } else {
 1167                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1168                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1169                 }
 1170         } else {
 1171                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1172                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1173         }
 1174         if (va->va_mtime.tv_sec != VNOVAL) {
 1175                 if (va->va_mtime.tv_sec != time_second) {
 1176                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1177                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1178                         txdr_nfsv3time(&va->va_mtime, tl);
 1179                 } else {
 1180                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1181                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1182                 }
 1183         } else {
 1184                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1185                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1186         }
 1187 }
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FreeBSD/Linux Kernel Cross Reference sys/nfsclient/nfs_subs.c

FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/nfs_subs.c
