The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)nfs_subs.c  8.8 (Berkeley) 5/22/95
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/5.0/sys/nfsclient/nfs_subs.c 104908 2002-10-11 14:58:34Z mike $");
   41 
   42 /*
   43  * These functions support the macros and help fiddle mbuf chains for
   44  * the nfs op functions. They do things like create the rpc header and
   45  * copy data between mbuf chains and uio lists.
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/bio.h>
   52 #include <sys/buf.h>
   53 #include <sys/proc.h>
   54 #include <sys/mount.h>
   55 #include <sys/vnode.h>
   56 #include <sys/namei.h>
   57 #include <sys/mbuf.h>
   58 #include <sys/socket.h>
   59 #include <sys/stat.h>
   60 #include <sys/malloc.h>
   61 #include <sys/sysent.h>
   62 #include <sys/syscall.h>
   63 #include <sys/sysproto.h>
   64 
   65 #include <vm/vm.h>
   66 #include <vm/vm_object.h>
   67 #include <vm/vm_extern.h>
   68 #include <vm/uma.h>
   69 
   70 #include <nfs/rpcv2.h>
   71 #include <nfs/nfsproto.h>
   72 #include <nfsclient/nfs.h>
   73 #include <nfsclient/nfsnode.h>
   74 #include <nfs/xdr_subs.h>
   75 #include <nfsclient/nfsm_subs.h>
   76 #include <nfsclient/nfsmount.h>
   77 
   78 #include <netinet/in.h>
   79 
   80 /*
   81  * Data items converted to xdr at startup, since they are constant
   82  * This is kinda hokey, but may save a little time doing byte swaps
   83  */
   84 u_int32_t       nfs_xdrneg1;
   85 u_int32_t       rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
   86                     rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
   87 u_int32_t       nfs_true, nfs_false;
   88 
   89 /* And other global data */
   90 static u_int32_t nfs_xid = 0;
   91 static enum vtype nv2tov_type[8]= {
   92         VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON,  VNON
   93 };
   94 
   95 int             nfs_ticks;
   96 int             nfs_pbuf_freecnt = -1;  /* start out unlimited */
   97 
   98 struct nfs_reqq nfs_reqq;
   99 struct nfs_bufq nfs_bufq;
  100 
  101 static int      nfs_prev_nfsclnt_sy_narg;
  102 static sy_call_t *nfs_prev_nfsclnt_sy_call;
  103 
  104 /*
  105  * and the reverse mapping from generic to Version 2 procedure numbers
  106  */
  107 int nfsv2_procid[NFS_NPROCS] = {
  108         NFSV2PROC_NULL,
  109         NFSV2PROC_GETATTR,
  110         NFSV2PROC_SETATTR,
  111         NFSV2PROC_LOOKUP,
  112         NFSV2PROC_NOOP,
  113         NFSV2PROC_READLINK,
  114         NFSV2PROC_READ,
  115         NFSV2PROC_WRITE,
  116         NFSV2PROC_CREATE,
  117         NFSV2PROC_MKDIR,
  118         NFSV2PROC_SYMLINK,
  119         NFSV2PROC_CREATE,
  120         NFSV2PROC_REMOVE,
  121         NFSV2PROC_RMDIR,
  122         NFSV2PROC_RENAME,
  123         NFSV2PROC_LINK,
  124         NFSV2PROC_READDIR,
  125         NFSV2PROC_NOOP,
  126         NFSV2PROC_STATFS,
  127         NFSV2PROC_NOOP,
  128         NFSV2PROC_NOOP,
  129         NFSV2PROC_NOOP,
  130         NFSV2PROC_NOOP,
  131 };
  132 
  133 LIST_HEAD(nfsnodehashhead, nfsnode);
  134 
  135 /*
  136  * Create the header for an rpc request packet
  137  * The hsiz is the size of the rest of the nfs request header.
  138  * (just used to decide if a cluster is a good idea)
  139  */
  140 struct mbuf *
  141 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
  142 {
  143         struct mbuf *mb;
  144 
  145         MGET(mb, M_TRYWAIT, MT_DATA);
  146         if (hsiz >= MINCLSIZE)
  147                 MCLGET(mb, M_TRYWAIT);
  148         mb->m_len = 0;
  149         return (mb);
  150 }
  151 
  152 /*
  153  * Build the RPC header and fill in the authorization info.
  154  * The authorization string argument is only used when the credentials
  155  * come from outside of the kernel.
  156  * Returns the head of the mbuf list.
  157  */
  158 struct mbuf *
  159 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type,
  160     int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp,
  161     u_int32_t *xidp)
  162 {
  163         struct mbuf *mb;
  164         u_int32_t *tl;
  165         caddr_t bpos;
  166         int i;
  167         struct mbuf *mreq;
  168         int grpsiz, authsiz;
  169 
  170         authsiz = nfsm_rndup(auth_len);
  171         MGETHDR(mb, M_TRYWAIT, MT_DATA);
  172         if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) {
  173                 MCLGET(mb, M_TRYWAIT);
  174         } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) {
  175                 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
  176         } else {
  177                 MH_ALIGN(mb, 8 * NFSX_UNSIGNED);
  178         }
  179         mb->m_len = 0;
  180         mreq = mb;
  181         bpos = mtod(mb, caddr_t);
  182 
  183         /*
  184          * First the RPC header.
  185          */
  186         tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED);
  187 
  188         /* Get a pretty random xid to start with */
  189         if (!nfs_xid)
  190                 nfs_xid = random();
  191         /*
  192          * Skip zero xid if it should ever happen.
  193          */
  194         if (++nfs_xid == 0)
  195                 nfs_xid++;
  196 
  197         *tl++ = *xidp = txdr_unsigned(nfs_xid);
  198         *tl++ = rpc_call;
  199         *tl++ = rpc_vers;
  200         *tl++ = txdr_unsigned(NFS_PROG);
  201         if (nmflag & NFSMNT_NFSV3) {
  202                 *tl++ = txdr_unsigned(NFS_VER3);
  203                 *tl++ = txdr_unsigned(procid);
  204         } else {
  205                 *tl++ = txdr_unsigned(NFS_VER2);
  206                 *tl++ = txdr_unsigned(nfsv2_procid[procid]);
  207         }
  208 
  209         /*
  210          * And then the authorization cred.
  211          */
  212         *tl++ = txdr_unsigned(auth_type);
  213         *tl = txdr_unsigned(authsiz);
  214         switch (auth_type) {
  215         case RPCAUTH_UNIX:
  216                 tl = nfsm_build(u_int32_t *, auth_len);
  217                 *tl++ = 0;              /* stamp ?? */
  218                 *tl++ = 0;              /* NULL hostname */
  219                 *tl++ = txdr_unsigned(cr->cr_uid);
  220                 *tl++ = txdr_unsigned(cr->cr_groups[0]);
  221                 grpsiz = (auth_len >> 2) - 5;
  222                 *tl++ = txdr_unsigned(grpsiz);
  223                 for (i = 1; i <= grpsiz; i++)
  224                         *tl++ = txdr_unsigned(cr->cr_groups[i]);
  225                 break;
  226         }
  227 
  228         /*
  229          * And the verifier...
  230          */
  231         tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
  232         *tl++ = txdr_unsigned(RPCAUTH_NULL);
  233         *tl = 0;
  234         mb->m_next = mrest;
  235         mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len;
  236         mreq->m_pkthdr.rcvif = NULL;
  237         *mbp = mb;
  238         return (mreq);
  239 }
  240 
  241 /*
  242  * copies a uio scatter/gather list to an mbuf chain.
  243  * NOTE: can ony handle iovcnt == 1
  244  */
  245 int
  246 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
  247 {
  248         char *uiocp;
  249         struct mbuf *mp, *mp2;
  250         int xfer, left, mlen;
  251         int uiosiz, clflg, rem;
  252         char *cp;
  253 
  254 #ifdef DIAGNOSTIC
  255         if (uiop->uio_iovcnt != 1)
  256                 panic("nfsm_uiotombuf: iovcnt != 1");
  257 #endif
  258 
  259         if (siz > MLEN)         /* or should it >= MCLBYTES ?? */
  260                 clflg = 1;
  261         else
  262                 clflg = 0;
  263         rem = nfsm_rndup(siz)-siz;
  264         mp = mp2 = *mq;
  265         while (siz > 0) {
  266                 left = uiop->uio_iov->iov_len;
  267                 uiocp = uiop->uio_iov->iov_base;
  268                 if (left > siz)
  269                         left = siz;
  270                 uiosiz = left;
  271                 while (left > 0) {
  272                         mlen = M_TRAILINGSPACE(mp);
  273                         if (mlen == 0) {
  274                                 MGET(mp, M_TRYWAIT, MT_DATA);
  275                                 if (clflg)
  276                                         MCLGET(mp, M_TRYWAIT);
  277                                 mp->m_len = 0;
  278                                 mp2->m_next = mp;
  279                                 mp2 = mp;
  280                                 mlen = M_TRAILINGSPACE(mp);
  281                         }
  282                         xfer = (left > mlen) ? mlen : left;
  283 #ifdef notdef
  284                         /* Not Yet.. */
  285                         if (uiop->uio_iov->iov_op != NULL)
  286                                 (*(uiop->uio_iov->iov_op))
  287                                 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  288                         else
  289 #endif
  290                         if (uiop->uio_segflg == UIO_SYSSPACE)
  291                                 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  292                         else
  293                                 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
  294                         mp->m_len += xfer;
  295                         left -= xfer;
  296                         uiocp += xfer;
  297                         uiop->uio_offset += xfer;
  298                         uiop->uio_resid -= xfer;
  299                 }
  300                 uiop->uio_iov->iov_base =
  301                     (char *)uiop->uio_iov->iov_base + uiosiz;
  302                 uiop->uio_iov->iov_len -= uiosiz;
  303                 siz -= uiosiz;
  304         }
  305         if (rem > 0) {
  306                 if (rem > M_TRAILINGSPACE(mp)) {
  307                         MGET(mp, M_TRYWAIT, MT_DATA);
  308                         mp->m_len = 0;
  309                         mp2->m_next = mp;
  310                 }
  311                 cp = mtod(mp, caddr_t)+mp->m_len;
  312                 for (left = 0; left < rem; left++)
  313                         *cp++ = '\0';
  314                 mp->m_len += rem;
  315                 *bpos = cp;
  316         } else
  317                 *bpos = mtod(mp, caddr_t)+mp->m_len;
  318         *mq = mp;
  319         return (0);
  320 }
  321 
  322 /*
  323  * Copy a string into mbufs for the hard cases...
  324  */
  325 int
  326 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
  327 {
  328         struct mbuf *m1 = NULL, *m2;
  329         long left, xfer, len, tlen;
  330         u_int32_t *tl;
  331         int putsize;
  332 
  333         putsize = 1;
  334         m2 = *mb;
  335         left = M_TRAILINGSPACE(m2);
  336         if (left > 0) {
  337                 tl = ((u_int32_t *)(*bpos));
  338                 *tl++ = txdr_unsigned(siz);
  339                 putsize = 0;
  340                 left -= NFSX_UNSIGNED;
  341                 m2->m_len += NFSX_UNSIGNED;
  342                 if (left > 0) {
  343                         bcopy(cp, (caddr_t) tl, left);
  344                         siz -= left;
  345                         cp += left;
  346                         m2->m_len += left;
  347                         left = 0;
  348                 }
  349         }
  350         /* Loop around adding mbufs */
  351         while (siz > 0) {
  352                 MGET(m1, M_TRYWAIT, MT_DATA);
  353                 if (siz > MLEN)
  354                         MCLGET(m1, M_TRYWAIT);
  355                 m1->m_len = NFSMSIZ(m1);
  356                 m2->m_next = m1;
  357                 m2 = m1;
  358                 tl = mtod(m1, u_int32_t *);
  359                 tlen = 0;
  360                 if (putsize) {
  361                         *tl++ = txdr_unsigned(siz);
  362                         m1->m_len -= NFSX_UNSIGNED;
  363                         tlen = NFSX_UNSIGNED;
  364                         putsize = 0;
  365                 }
  366                 if (siz < m1->m_len) {
  367                         len = nfsm_rndup(siz);
  368                         xfer = siz;
  369                         if (xfer < len)
  370                                 *(tl+(xfer>>2)) = 0;
  371                 } else {
  372                         xfer = len = m1->m_len;
  373                 }
  374                 bcopy(cp, (caddr_t) tl, xfer);
  375                 m1->m_len = len+tlen;
  376                 siz -= xfer;
  377                 cp += xfer;
  378         }
  379         *mb = m1;
  380         *bpos = mtod(m1, caddr_t)+m1->m_len;
  381         return (0);
  382 }
  383 
  384 /*
  385  * Called once to initialize data structures...
  386  */
  387 int
  388 nfs_init(struct vfsconf *vfsp)
  389 {
  390         int i;
  391 
  392         nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
  393             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
  394         rpc_vers = txdr_unsigned(RPC_VER2);
  395         rpc_call = txdr_unsigned(RPC_CALL);
  396         rpc_reply = txdr_unsigned(RPC_REPLY);
  397         rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
  398         rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
  399         rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
  400         rpc_autherr = txdr_unsigned(RPC_AUTHERR);
  401         rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
  402         nfs_true = txdr_unsigned(TRUE);
  403         nfs_false = txdr_unsigned(FALSE);
  404         nfs_xdrneg1 = txdr_unsigned(-1);
  405         nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
  406         if (nfs_ticks < 1)
  407                 nfs_ticks = 1;
  408         /* Ensure async daemons disabled */
  409         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  410                 nfs_iodwant[i] = NULL;
  411                 nfs_iodmount[i] = NULL;
  412         }
  413         nfs_nhinit();                   /* Init the nfsnode table */
  414 
  415         /*
  416          * Initialize reply list and start timer
  417          */
  418         TAILQ_INIT(&nfs_reqq);
  419 
  420         nfs_timer(0);
  421 
  422         nfs_prev_nfsclnt_sy_narg = sysent[SYS_nfsclnt].sy_narg;
  423         sysent[SYS_nfsclnt].sy_narg = 2;
  424         nfs_prev_nfsclnt_sy_call = sysent[SYS_nfsclnt].sy_call;
  425         sysent[SYS_nfsclnt].sy_call = (sy_call_t *)nfsclnt;
  426 
  427         nfs_pbuf_freecnt = nswbuf / 2 + 1;
  428 
  429         return (0);
  430 }
  431 
  432 int
  433 nfs_uninit(struct vfsconf *vfsp)
  434 {
  435 
  436         untimeout(nfs_timer, (void *)NULL, nfs_timer_handle);
  437         sysent[SYS_nfsclnt].sy_narg = nfs_prev_nfsclnt_sy_narg;
  438         sysent[SYS_nfsclnt].sy_call = nfs_prev_nfsclnt_sy_call;
  439         return (0);
  440 }
  441 
  442 /*
  443  * Attribute cache routines.
  444  * nfs_loadattrcache() - loads or updates the cache contents from attributes
  445  *      that are on the mbuf list
  446  * nfs_getattrcache() - returns valid attributes if found in cache, returns
  447  *      error otherwise
  448  */
  449 
  450 /*
  451  * Load the attribute cache (that lives in the nfsnode entry) with
  452  * the values on the mbuf list and
  453  * Iff vap not NULL
  454  *    copy the attributes to *vaper
  455  */
  456 int
  457 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
  458     struct vattr *vaper, int dontshrink)
  459 {
  460         struct vnode *vp = *vpp;
  461         struct vattr *vap;
  462         struct nfs_fattr *fp;
  463         struct nfsnode *np;
  464         int32_t t1;
  465         caddr_t cp2;
  466         int rdev;
  467         struct mbuf *md;
  468         enum vtype vtyp;
  469         u_short vmode;
  470         struct timespec mtime;
  471         int v3 = NFS_ISV3(vp);
  472 
  473         md = *mdp;
  474         t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
  475         cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1);
  476         if (cp2 == NULL)
  477                 return EBADRPC;
  478         fp = (struct nfs_fattr *)cp2;
  479         if (v3) {
  480                 vtyp = nfsv3tov_type(fp->fa_type);
  481                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  482                 rdev = makeudev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
  483                         fxdr_unsigned(int, fp->fa3_rdev.specdata2));
  484                 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
  485         } else {
  486                 vtyp = nfsv2tov_type(fp->fa_type);
  487                 vmode = fxdr_unsigned(u_short, fp->fa_mode);
  488                 /*
  489                  * XXX
  490                  *
  491                  * The duplicate information returned in fa_type and fa_mode
  492                  * is an ambiguity in the NFS version 2 protocol.
  493                  *
  494                  * VREG should be taken literally as a regular file.  If a
  495                  * server intents to return some type information differently
  496                  * in the upper bits of the mode field (e.g. for sockets, or
  497                  * FIFOs), NFSv2 mandates fa_type to be VNON.  Anyway, we
  498                  * leave the examination of the mode bits even in the VREG
  499                  * case to avoid breakage for bogus servers, but we make sure
  500                  * that there are actually type bits set in the upper part of
  501                  * fa_mode (and failing that, trust the va_type field).
  502                  *
  503                  * NFSv3 cleared the issue, and requires fa_mode to not
  504                  * contain any type information (while also introduing sockets
  505                  * and FIFOs for fa_type).
  506                  */
  507                 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
  508                         vtyp = IFTOVT(vmode);
  509                 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
  510                 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
  511 
  512                 /*
  513                  * Really ugly NFSv2 kludge.
  514                  */
  515                 if (vtyp == VCHR && rdev == 0xffffffff)
  516                         vtyp = VFIFO;
  517         }
  518 
  519         /*
  520          * If v_type == VNON it is a new node, so fill in the v_type,
  521          * n_mtime fields. Check to see if it represents a special
  522          * device, and if so, check for a possible alias. Once the
  523          * correct vnode has been obtained, fill in the rest of the
  524          * information.
  525          */
  526         np = VTONFS(vp);
  527         if (vp->v_type != vtyp) {
  528                 vp->v_type = vtyp;
  529                 if (vp->v_type == VFIFO) {
  530                         vp->v_op = fifo_nfsv2nodeop_p;
  531                 }
  532                 if (vp->v_type == VCHR || vp->v_type == VBLK) {
  533                         vp->v_op = spec_nfsv2nodeop_p;
  534                         vp = addaliasu(vp, rdev);
  535                         np->n_vnode = vp;
  536                 }
  537                 np->n_mtime = mtime.tv_sec;
  538         }
  539         vap = &np->n_vattr;
  540         vap->va_type = vtyp;
  541         vap->va_mode = (vmode & 07777);
  542         vap->va_rdev = rdev;
  543         vap->va_mtime = mtime;
  544         vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  545         if (v3) {
  546                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  547                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  548                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  549                 vap->va_size = fxdr_hyper(&fp->fa3_size);
  550                 vap->va_blocksize = NFS_FABLKSIZE;
  551                 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
  552                 vap->va_fileid = fxdr_unsigned(int32_t,
  553                     fp->fa3_fileid.nfsuquad[1]);
  554                 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
  555                 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
  556                 vap->va_flags = 0;
  557                 vap->va_filerev = 0;
  558         } else {
  559                 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
  560                 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  561                 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  562                 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
  563                 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
  564                 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
  565                     * NFS_FABLKSIZE;
  566                 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
  567                 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
  568                 vap->va_flags = 0;
  569                 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
  570                     fp->fa2_ctime.nfsv2_sec);
  571                 vap->va_ctime.tv_nsec = 0;
  572                 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
  573                 vap->va_filerev = 0;
  574         }
  575         np->n_attrstamp = time_second;
  576         if (vap->va_size != np->n_size) {
  577                 if (vap->va_type == VREG) {
  578                         if (dontshrink && vap->va_size < np->n_size) {
  579                                 /*
  580                                  * We've been told not to shrink the file;
  581                                  * zero np->n_attrstamp to indicate that
  582                                  * the attributes are stale.
  583                                  */
  584                                 vap->va_size = np->n_size;
  585                                 np->n_attrstamp = 0;
  586                         } else if (np->n_flag & NMODIFIED) {
  587                                 if (vap->va_size < np->n_size)
  588                                         vap->va_size = np->n_size;
  589                                 else
  590                                         np->n_size = vap->va_size;
  591                         } else {
  592                                 np->n_size = vap->va_size;
  593                         }
  594                         vnode_pager_setsize(vp, np->n_size);
  595                 } else {
  596                         np->n_size = vap->va_size;
  597                 }
  598         }
  599         if (vaper != NULL) {
  600                 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  601                 if (np->n_flag & NCHG) {
  602                         if (np->n_flag & NACC)
  603                                 vaper->va_atime = np->n_atim;
  604                         if (np->n_flag & NUPD)
  605                                 vaper->va_mtime = np->n_mtim;
  606                 }
  607         }
  608         return (0);
  609 }
  610 
  611 #ifdef NFS_ACDEBUG
  612 #include <sys/sysctl.h>
  613 SYSCTL_DECL(_vfs_nfs);
  614 static int nfs_acdebug;
  615 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  616 #endif
  617 
  618 /*
  619  * Check the time stamp
  620  * If the cache is valid, copy contents to *vap and return 0
  621  * otherwise return an error
  622  */
  623 int
  624 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
  625 {
  626         struct nfsnode *np;
  627         struct vattr *vap;
  628         struct nfsmount *nmp;
  629         int timeo;
  630 
  631         np = VTONFS(vp);
  632         vap = &np->n_vattr;
  633         nmp = VFSTONFS(vp->v_mount);
  634         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  635         timeo = (time_second - np->n_mtime) / 10;
  636 
  637 #ifdef NFS_ACDEBUG
  638         if (nfs_acdebug>1)
  639                 printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  640 #endif
  641 
  642         if (vap->va_type == VDIR) {
  643                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  644                         timeo = nmp->nm_acdirmin;
  645                 else if (timeo > nmp->nm_acdirmax)
  646                         timeo = nmp->nm_acdirmax;
  647         } else {
  648                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  649                         timeo = nmp->nm_acregmin;
  650                 else if (timeo > nmp->nm_acregmax)
  651                         timeo = nmp->nm_acregmax;
  652         }
  653 
  654 #ifdef NFS_ACDEBUG
  655         if (nfs_acdebug > 2)
  656                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  657                         nmp->nm_acregmin, nmp->nm_acregmax,
  658                         nmp->nm_acdirmin, nmp->nm_acdirmax);
  659 
  660         if (nfs_acdebug)
  661                 printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  662                         (time_second - np->n_attrstamp), timeo);
  663 #endif
  664 
  665         if ((time_second - np->n_attrstamp) >= timeo) {
  666                 nfsstats.attrcache_misses++;
  667                 return (ENOENT);
  668         }
  669         nfsstats.attrcache_hits++;
  670         if (vap->va_size != np->n_size) {
  671                 if (vap->va_type == VREG) {
  672                         if (np->n_flag & NMODIFIED) {
  673                                 if (vap->va_size < np->n_size)
  674                                         vap->va_size = np->n_size;
  675                                 else
  676                                         np->n_size = vap->va_size;
  677                         } else {
  678                                 np->n_size = vap->va_size;
  679                         }
  680                         vnode_pager_setsize(vp, np->n_size);
  681                 } else {
  682                         np->n_size = vap->va_size;
  683                 }
  684         }
  685         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  686         if (np->n_flag & NCHG) {
  687                 if (np->n_flag & NACC)
  688                         vaper->va_atime = np->n_atim;
  689                 if (np->n_flag & NUPD)
  690                         vaper->va_mtime = np->n_mtim;
  691         }
  692         return (0);
  693 }
  694 
  695 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  696 /*
  697  * This function finds the directory cookie that corresponds to the
  698  * logical byte offset given.
  699  */
  700 nfsuint64 *
  701 nfs_getcookie(struct nfsnode *np, off_t off, int add)
  702 {
  703         struct nfsdmap *dp, *dp2;
  704         int pos;
  705 
  706         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  707         if (pos == 0 || off < 0) {
  708 #ifdef DIAGNOSTIC
  709                 if (add)
  710                         panic("nfs getcookie add at <= 0");
  711 #endif
  712                 return (&nfs_nullcookie);
  713         }
  714         pos--;
  715         dp = LIST_FIRST(&np->n_cookies);
  716         if (!dp) {
  717                 if (add) {
  718                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  719                                 M_NFSDIROFF, M_WAITOK);
  720                         dp->ndm_eocookie = 0;
  721                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  722                 } else
  723                         return (NULL);
  724         }
  725         while (pos >= NFSNUMCOOKIES) {
  726                 pos -= NFSNUMCOOKIES;
  727                 if (LIST_NEXT(dp, ndm_list)) {
  728                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  729                                 pos >= dp->ndm_eocookie)
  730                                 return (NULL);
  731                         dp = LIST_NEXT(dp, ndm_list);
  732                 } else if (add) {
  733                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  734                                 M_NFSDIROFF, M_WAITOK);
  735                         dp2->ndm_eocookie = 0;
  736                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  737                         dp = dp2;
  738                 } else
  739                         return (NULL);
  740         }
  741         if (pos >= dp->ndm_eocookie) {
  742                 if (add)
  743                         dp->ndm_eocookie = pos + 1;
  744                 else
  745                         return (NULL);
  746         }
  747         return (&dp->ndm_cookies[pos]);
  748 }
  749 
  750 /*
  751  * Invalidate cached directory information, except for the actual directory
  752  * blocks (which are invalidated separately).
  753  * Done mainly to avoid the use of stale offset cookies.
  754  */
  755 void
  756 nfs_invaldir(struct vnode *vp)
  757 {
  758         struct nfsnode *np = VTONFS(vp);
  759 
  760 #ifdef DIAGNOSTIC
  761         if (vp->v_type != VDIR)
  762                 panic("nfs: invaldir not dir");
  763 #endif
  764         np->n_direofoffset = 0;
  765         np->n_cookieverf.nfsuquad[0] = 0;
  766         np->n_cookieverf.nfsuquad[1] = 0;
  767         if (LIST_FIRST(&np->n_cookies))
  768                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  769 }
  770 
  771 /*
  772  * The write verifier has changed (probably due to a server reboot), so all
  773  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  774  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  775  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  776  * mount point.
  777  *
  778  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  779  * writes are not clusterable.
  780  */
  781 void
  782 nfs_clearcommit(struct mount *mp)
  783 {
  784         struct vnode *vp, *nvp;
  785         struct buf *bp, *nbp;
  786         int s;
  787 
  788         GIANT_REQUIRED;
  789 
  790         s = splbio();
  791         mtx_lock(&mntvnode_mtx);
  792 loop:
  793         for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) {
  794                 if (vp->v_mount != mp)  /* Paranoia */
  795                         goto loop;
  796                 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
  797                 VI_LOCK(vp);
  798                 mtx_unlock(&mntvnode_mtx);
  799                 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
  800                         nbp = TAILQ_NEXT(bp, b_vnbufs);
  801                         if (BUF_REFCNT(bp) == 0 &&
  802                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  803                                 == (B_DELWRI | B_NEEDCOMMIT))
  804                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  805                 }
  806                 VI_UNLOCK(vp);
  807                 mtx_lock(&mntvnode_mtx);
  808         }
  809         mtx_unlock(&mntvnode_mtx);
  810         splx(s);
  811 }
  812 
  813 /*
  814  * Helper functions for former macros.  Some of these should be
  815  * moved to their callers.
  816  */
  817 
  818 int
  819 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
  820     struct mbuf **md, caddr_t *dpos)
  821 {
  822         struct nfsnode *ttnp;
  823         struct vnode *ttvp;
  824         nfsfh_t *ttfhp;
  825         u_int32_t *tl;
  826         int ttfhsize;
  827         int t1;
  828 
  829         if (v3) {
  830                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  831                 if (tl == NULL)
  832                         return EBADRPC;
  833                 *f = fxdr_unsigned(int, *tl);
  834         } else
  835                 *f = 1;
  836         if (*f) {
  837                 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
  838                 if (t1 != 0)
  839                         return t1;
  840                 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp);
  841                 if (t1 != 0)
  842                         return t1;
  843                 *v = NFSTOV(ttnp);
  844         }
  845         if (v3) {
  846                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  847                 if (tl == NULL)
  848                         return EBADRPC;
  849                 if (*f)
  850                         *f = fxdr_unsigned(int, *tl);
  851                 else if (fxdr_unsigned(int, *tl))
  852                         nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
  853         }
  854         if (*f) {
  855                 ttvp = *v;
  856                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
  857                 if (t1)
  858                         return t1;
  859                 *v = ttvp;
  860         }
  861         return 0;
  862 }
  863 
  864 int
  865 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
  866 {
  867         u_int32_t *tl;
  868 
  869         if (v3) {
  870                 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  871                 if (tl == NULL)
  872                         return EBADRPC;
  873                 *s = fxdr_unsigned(int, *tl);
  874                 if (*s <= 0 || *s > NFSX_V3FHMAX)
  875                         return EBADRPC;
  876         } else
  877                 *s = NFSX_V2FH;
  878         *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
  879         if (*f == NULL)
  880                 return EBADRPC;
  881         else
  882                 return 0;
  883 }
  884 
  885 
  886 int
  887 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
  888     caddr_t *dpos)
  889 {
  890         int t1;
  891 
  892         struct vnode *ttvp = *v;
  893         t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
  894         if (t1 != 0)
  895                 return t1;
  896         *v = ttvp;
  897         return 0;
  898 }
  899 
  900 int
  901 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md,
  902     caddr_t *dpos)
  903 {
  904         u_int32_t *tl;
  905         int t1;
  906 
  907         struct vnode *ttvp = *v;
  908         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  909         if (tl == NULL)
  910                 return EBADRPC;
  911         *f = fxdr_unsigned(int, *tl);
  912         if (*f != 0) {
  913                 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1);
  914                 if (t1 != 0) {
  915                         *f = 0;
  916                         return t1;
  917                 }
  918                 *v = ttvp;
  919         }
  920         return 0;
  921 }
  922 
  923 int
  924 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
  925 {
  926         u_int32_t *tl;
  927         int ttattrf, ttretf = 0;
  928         int t1;
  929 
  930         tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
  931         if (tl == NULL)
  932                 return EBADRPC;
  933         if (*tl == nfs_true) {
  934                 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
  935                 if (tl == NULL)
  936                         return EBADRPC;
  937                 if (*f)
  938                         ttretf = (VTONFS(*v)->n_mtime ==
  939                             fxdr_unsigned(u_int32_t, *(tl + 2)));
  940         }
  941         t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos);
  942         if (t1)
  943                 return t1;
  944         if (*f)
  945                 *f = ttretf;
  946         else
  947                 *f = ttattrf;
  948         return 0;
  949 }
  950 
  951 int
  952 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
  953 {
  954         u_int32_t *tl;
  955         int t1;
  956 
  957         if (s > m)
  958                 return ENAMETOOLONG;
  959         t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
  960         if (t1 <= M_TRAILINGSPACE(*mb)) {
  961                 tl = nfsm_build_xx(t1, mb, bpos);
  962                 *tl++ = txdr_unsigned(s);
  963                 *(tl + ((t1 >> 2) - 2)) = 0;
  964                 bcopy(a, tl, s);
  965         } else {
  966                 t1 = nfsm_strtmbuf(mb, bpos, a, s);
  967                 if (t1 != 0)
  968                         return t1;
  969         }
  970         return 0;
  971 }
  972 
  973 int
  974 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
  975 {
  976         u_int32_t *tl;
  977         int t1;
  978         caddr_t cp;
  979 
  980         if (v3) {
  981                 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
  982                 if (t1 < M_TRAILINGSPACE(*mb)) {
  983                         tl = nfsm_build_xx(t1, mb, bpos);
  984                         *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
  985                         *(tl + ((t1 >> 2) - 2)) = 0;
  986                         bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
  987                 } else {
  988                         t1 = nfsm_strtmbuf(mb, bpos,
  989                             (const char *)VTONFS(v)->n_fhp,
  990                             VTONFS(v)->n_fhsize);
  991                         if (t1 != 0)
  992                                 return t1;
  993                 }
  994         } else {
  995                 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
  996                 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
  997         }
  998         return 0;
  999 }
 1000 
 1001 void
 1002 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
 1003     caddr_t *bpos)
 1004 {
 1005         u_int32_t *tl;
 1006 
 1007         if (va->va_mode != (mode_t)VNOVAL) {
 1008                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1009                 *tl++ = nfs_true;
 1010                 *tl = txdr_unsigned(va->va_mode);
 1011         } else {
 1012                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1013                 *tl = nfs_false;
 1014         }
 1015         if (full && va->va_uid != (uid_t)VNOVAL) {
 1016                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1017                 *tl++ = nfs_true;
 1018                 *tl = txdr_unsigned(va->va_uid);
 1019         } else {
 1020                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1021                 *tl = nfs_false;
 1022         }
 1023         if (full && va->va_gid != (gid_t)VNOVAL) {
 1024                 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
 1025                 *tl++ = nfs_true;
 1026                 *tl = txdr_unsigned(va->va_gid);
 1027         } else {
 1028                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1029                 *tl = nfs_false;
 1030         }
 1031         if (full && va->va_size != VNOVAL) {
 1032                 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1033                 *tl++ = nfs_true;
 1034                 txdr_hyper(va->va_size, tl);
 1035         } else {
 1036                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1037                 *tl = nfs_false;
 1038         }
 1039         if (va->va_atime.tv_sec != VNOVAL) {
 1040                 if (va->va_atime.tv_sec != time_second) {
 1041                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1042                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1043                         txdr_nfsv3time(&va->va_atime, tl);
 1044                 } else {
 1045                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1046                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1047                 }
 1048         } else {
 1049                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1050                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1051         }
 1052         if (va->va_mtime.tv_sec != VNOVAL) {
 1053                 if (va->va_mtime.tv_sec != time_second) {
 1054                         tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
 1055                         *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
 1056                         txdr_nfsv3time(&va->va_mtime, tl);
 1057                 } else {
 1058                         tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1059                         *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
 1060                 }
 1061         } else {
 1062                 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
 1063                 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
 1064         }
 1065 }

Cache object: e26500ddb8ae4a705667e38852e6fb3b


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