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_socket.c

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    1 /*-
    2  * Copyright (c) 1989, 1991, 1993, 1995
    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_socket.c        8.5 (Berkeley) 3/30/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/6.0/sys/nfsclient/nfs_socket.c 151122 2005-10-09 03:21:56Z delphij $");
   37 
   38 /*
   39  * Socket operations for use by nfs
   40  */
   41 
   42 #include "opt_inet6.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/kernel.h>
   47 #include <sys/lock.h>
   48 #include <sys/malloc.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/mount.h>
   51 #include <sys/mutex.h>
   52 #include <sys/proc.h>
   53 #include <sys/protosw.h>
   54 #include <sys/signalvar.h>
   55 #include <sys/syscallsubr.h>
   56 #include <sys/socket.h>
   57 #include <sys/socketvar.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/syslog.h>
   60 #include <sys/vnode.h>
   61 
   62 #include <netinet/in.h>
   63 #include <netinet/tcp.h>
   64 
   65 #include <rpc/rpcclnt.h>
   66 
   67 #include <nfs/rpcv2.h>
   68 #include <nfs/nfsproto.h>
   69 #include <nfsclient/nfs.h>
   70 #include <nfs/xdr_subs.h>
   71 #include <nfsclient/nfsm_subs.h>
   72 #include <nfsclient/nfsmount.h>
   73 #include <nfsclient/nfsnode.h>
   74 
   75 #include <nfs4client/nfs4.h>
   76 
   77 #define TRUE    1
   78 #define FALSE   0
   79 
   80 /*
   81  * Estimate rto for an nfs rpc sent via. an unreliable datagram.
   82  * Use the mean and mean deviation of rtt for the appropriate type of rpc
   83  * for the frequent rpcs and a default for the others.
   84  * The justification for doing "other" this way is that these rpcs
   85  * happen so infrequently that timer est. would probably be stale.
   86  * Also, since many of these rpcs are
   87  * non-idempotent, a conservative timeout is desired.
   88  * getattr, lookup - A+2D
   89  * read, write     - A+4D
   90  * other           - nm_timeo
   91  */
   92 #define NFS_RTO(n, t) \
   93         ((t) == 0 ? (n)->nm_timeo : \
   94          ((t) < 3 ? \
   95           (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
   96           ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
   97 #define NFS_SRTT(r)     (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
   98 #define NFS_SDRTT(r)    (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
   99 
  100 /*
  101  * Defines which timer to use for the procnum.
  102  * 0 - default
  103  * 1 - getattr
  104  * 2 - lookup
  105  * 3 - read
  106  * 4 - write
  107  */
  108 static int proct[NFS_NPROCS] = {
  109         0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
  110 };
  111 
  112 static int      nfs_realign_test;
  113 static int      nfs_realign_count;
  114 static int      nfs_bufpackets = 4;
  115 static int      nfs_reconnects;
  116 
  117 SYSCTL_DECL(_vfs_nfs);
  118 
  119 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
  120 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
  121 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
  122 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
  123     "number of times the nfs client has had to reconnect");
  124 
  125 
  126 /*
  127  * There is a congestion window for outstanding rpcs maintained per mount
  128  * point. The cwnd size is adjusted in roughly the way that:
  129  * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
  130  * SIGCOMM '88". ACM, August 1988.
  131  * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
  132  * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
  133  * of rpcs is in progress.
  134  * (The sent count and cwnd are scaled for integer arith.)
  135  * Variants of "slow start" were tried and were found to be too much of a
  136  * performance hit (ave. rtt 3 times larger),
  137  * I suspect due to the large rtt that nfs rpcs have.
  138  */
  139 #define NFS_CWNDSCALE   256
  140 #define NFS_MAXCWND     (NFS_CWNDSCALE * 32)
  141 #define NFS_NBACKOFF    8
  142 static int nfs_backoff[NFS_NBACKOFF] = { 2, 4, 8, 16, 32, 64, 128, 256, };
  143 struct callout  nfs_callout;
  144 
  145 static int      nfs_msg(struct thread *, const char *, const char *, int);
  146 static int      nfs_realign(struct mbuf **pm, int hsiz);
  147 static int      nfs_reply(struct nfsreq *);
  148 static void     nfs_softterm(struct nfsreq *rep);
  149 static int      nfs_reconnect(struct nfsreq *rep);
  150 static void nfs_clnt_tcp_soupcall(struct socket *so, void *arg, int waitflag);
  151 static void nfs_clnt_udp_soupcall(struct socket *so, void *arg, int waitflag);
  152 static void wakeup_nfsreq(struct nfsreq *req);
  153 
  154 extern struct mtx nfs_reqq_mtx;
  155 extern struct mtx nfs_reply_mtx;
  156 
  157 /*
  158  * Initialize sockets and congestion for a new NFS connection.
  159  * We do not free the sockaddr if error.
  160  */
  161 int
  162 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
  163 {
  164         struct socket *so;
  165         int error, rcvreserve, sndreserve;
  166         int pktscale;
  167         struct sockaddr *saddr;
  168         struct thread *td = &thread0; /* only used for socreate and sobind */
  169 
  170         NET_ASSERT_GIANT();
  171 
  172         if (nmp->nm_sotype == SOCK_STREAM) {
  173                 mtx_lock(&nmp->nm_nfstcpstate.mtx);
  174                 nmp->nm_nfstcpstate.flags |= NFS_TCP_EXPECT_RPCMARKER;
  175                 nmp->nm_nfstcpstate.rpcresid = 0;
  176                 mtx_unlock(&nmp->nm_nfstcpstate.mtx);
  177         }       
  178         nmp->nm_so = NULL;
  179         saddr = nmp->nm_nam;
  180         error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
  181                 nmp->nm_soproto, nmp->nm_mountp->mnt_cred, td);
  182         if (error)
  183                 goto bad;
  184         so = nmp->nm_so;
  185         nmp->nm_soflags = so->so_proto->pr_flags;
  186 
  187         /*
  188          * Some servers require that the client port be a reserved port number.
  189          */
  190         if (nmp->nm_flag & NFSMNT_RESVPORT) {
  191                 struct sockopt sopt;
  192                 int ip, ip2, len;
  193                 struct sockaddr_in6 ssin;
  194                 struct sockaddr *sa;
  195 
  196                 bzero(&sopt, sizeof sopt);
  197                 switch(saddr->sa_family) {
  198                 case AF_INET:
  199                         sopt.sopt_level = IPPROTO_IP;
  200                         sopt.sopt_name = IP_PORTRANGE;
  201                         ip = IP_PORTRANGE_LOW;
  202                         ip2 = IP_PORTRANGE_DEFAULT;
  203                         len = sizeof (struct sockaddr_in);
  204                         break;
  205 #ifdef INET6
  206                 case AF_INET6:
  207                         sopt.sopt_level = IPPROTO_IPV6;
  208                         sopt.sopt_name = IPV6_PORTRANGE;
  209                         ip = IPV6_PORTRANGE_LOW;
  210                         ip2 = IPV6_PORTRANGE_DEFAULT;
  211                         len = sizeof (struct sockaddr_in6);
  212                         break;
  213 #endif
  214                 default:
  215                         goto noresvport;
  216                 }
  217                 sa = (struct sockaddr *)&ssin;
  218                 bzero(sa, len);
  219                 sa->sa_len = len;
  220                 sa->sa_family = saddr->sa_family;
  221                 sopt.sopt_dir = SOPT_SET;
  222                 sopt.sopt_val = (void *)&ip;
  223                 sopt.sopt_valsize = sizeof(ip);
  224                 error = sosetopt(so, &sopt);
  225                 if (error)
  226                         goto bad;
  227                 error = sobind(so, sa, td);
  228                 if (error)
  229                         goto bad;
  230                 ip = ip2;
  231                 error = sosetopt(so, &sopt);
  232                 if (error)
  233                         goto bad;
  234         noresvport: ;
  235         }
  236 
  237         /*
  238          * Protocols that do not require connections may be optionally left
  239          * unconnected for servers that reply from a port other than NFS_PORT.
  240          */
  241         if (nmp->nm_flag & NFSMNT_NOCONN) {
  242                 if (nmp->nm_soflags & PR_CONNREQUIRED) {
  243                         error = ENOTCONN;
  244                         goto bad;
  245                 }
  246         } else {
  247                 error = soconnect(so, nmp->nm_nam, td);
  248                 if (error)
  249                         goto bad;
  250 
  251                 /*
  252                  * Wait for the connection to complete. Cribbed from the
  253                  * connect system call but with the wait timing out so
  254                  * that interruptible mounts don't hang here for a long time.
  255                  */
  256                 SOCK_LOCK(so);
  257                 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
  258                         (void) msleep(&so->so_timeo, SOCK_MTX(so),
  259                             PSOCK, "nfscon", 2 * hz);
  260                         if ((so->so_state & SS_ISCONNECTING) &&
  261                             so->so_error == 0 && rep &&
  262                             (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0) {
  263                                 so->so_state &= ~SS_ISCONNECTING;
  264                                 SOCK_UNLOCK(so);
  265                                 goto bad;
  266                         }
  267                 }
  268                 if (so->so_error) {
  269                         error = so->so_error;
  270                         so->so_error = 0;
  271                         SOCK_UNLOCK(so);
  272                         goto bad;
  273                 }
  274                 SOCK_UNLOCK(so);
  275         }
  276         so->so_rcv.sb_timeo = 12 * hz;
  277         so->so_snd.sb_timeo = 5 * hz;
  278 
  279         /*
  280          * Get buffer reservation size from sysctl, but impose reasonable
  281          * limits.
  282          */
  283         pktscale = nfs_bufpackets;
  284         if (pktscale < 2)
  285                 pktscale = 2;
  286         if (pktscale > 64)
  287                 pktscale = 64;
  288 
  289         if (nmp->nm_sotype == SOCK_DGRAM) {
  290                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
  291                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
  292                     NFS_MAXPKTHDR) * pktscale;
  293         } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
  294                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
  295                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
  296                     NFS_MAXPKTHDR) * pktscale;
  297         } else {
  298                 if (nmp->nm_sotype != SOCK_STREAM)
  299                         panic("nfscon sotype");
  300                 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
  301                         struct sockopt sopt;
  302                         int val;
  303 
  304                         bzero(&sopt, sizeof sopt);
  305                         sopt.sopt_dir = SOPT_SET;
  306                         sopt.sopt_level = SOL_SOCKET;
  307                         sopt.sopt_name = SO_KEEPALIVE;
  308                         sopt.sopt_val = &val;
  309                         sopt.sopt_valsize = sizeof val;
  310                         val = 1;
  311                         sosetopt(so, &sopt);
  312                 }
  313                 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
  314                         struct sockopt sopt;
  315                         int val;
  316 
  317                         bzero(&sopt, sizeof sopt);
  318                         sopt.sopt_dir = SOPT_SET;
  319                         sopt.sopt_level = IPPROTO_TCP;
  320                         sopt.sopt_name = TCP_NODELAY;
  321                         sopt.sopt_val = &val;
  322                         sopt.sopt_valsize = sizeof val;
  323                         val = 1;
  324                         sosetopt(so, &sopt);
  325                 }
  326                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
  327                     sizeof (u_int32_t)) * pktscale;
  328                 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
  329                     sizeof (u_int32_t)) * pktscale;
  330         }
  331         error = soreserve(so, sndreserve, rcvreserve);
  332         if (error)
  333                 goto bad;
  334         SOCKBUF_LOCK(&so->so_rcv);
  335         so->so_rcv.sb_flags |= SB_NOINTR;
  336         so->so_upcallarg = (caddr_t)nmp;
  337         if (so->so_type == SOCK_STREAM)
  338                 so->so_upcall = nfs_clnt_tcp_soupcall;
  339         else    
  340                 so->so_upcall = nfs_clnt_udp_soupcall;
  341         so->so_rcv.sb_flags |= SB_UPCALL;
  342         SOCKBUF_UNLOCK(&so->so_rcv);
  343         SOCKBUF_LOCK(&so->so_snd);
  344         so->so_snd.sb_flags |= SB_NOINTR;
  345         SOCKBUF_UNLOCK(&so->so_snd);
  346 
  347         /* Initialize other non-zero congestion variables */
  348         nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] =
  349                 nmp->nm_srtt[3] = (NFS_TIMEO << 3);
  350         nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
  351                 nmp->nm_sdrtt[3] = 0;
  352         nmp->nm_cwnd = NFS_MAXCWND / 2;     /* Initial send window */
  353         nmp->nm_sent = 0;
  354         nmp->nm_timeouts = 0;
  355         return (0);
  356 
  357 bad:
  358         nfs_disconnect(nmp);
  359         return (error);
  360 }
  361 
  362 /*
  363  * Reconnect routine:
  364  * Called when a connection is broken on a reliable protocol.
  365  * - clean up the old socket
  366  * - nfs_connect() again
  367  * - set R_MUSTRESEND for all outstanding requests on mount point
  368  * If this fails the mount point is DEAD!
  369  * nb: Must be called with the nfs_sndlock() set on the mount point.
  370  */
  371 static int
  372 nfs_reconnect(struct nfsreq *rep)
  373 {
  374         struct nfsreq *rp;
  375         struct nfsmount *nmp = rep->r_nmp;
  376         int error;
  377 
  378         nfs_reconnects++;
  379         nfs_disconnect(nmp);
  380         while ((error = nfs_connect(nmp, rep)) != 0) {
  381                 if (error == ERESTART)
  382                         error = EINTR;
  383                 if (error == EIO || error == EINTR)
  384                         return (error);
  385                 (void) tsleep(&lbolt, PSOCK, "nfscon", 0);
  386         }
  387 
  388         /*
  389          * Clear the FORCE_RECONNECT flag only after the connect 
  390          * succeeds. To prevent races between multiple processes 
  391          * waiting on the mountpoint where the connection is being
  392          * torn down. The first one to acquire the sndlock will 
  393          * retry the connection. The others block on the sndlock
  394          * until the connection is established successfully, and 
  395          * then re-transmit the request.
  396          */
  397         mtx_lock(&nmp->nm_nfstcpstate.mtx);
  398         nmp->nm_nfstcpstate.flags &= ~NFS_TCP_FORCE_RECONNECT;
  399         mtx_unlock(&nmp->nm_nfstcpstate.mtx);   
  400 
  401         /*
  402          * Loop through outstanding request list and fix up all requests
  403          * on old socket.
  404          */
  405         mtx_lock(&nfs_reqq_mtx);
  406         TAILQ_FOREACH(rp, &nfs_reqq, r_chain) {
  407                 if (rp->r_nmp == nmp)
  408                         rp->r_flags |= R_MUSTRESEND;
  409         }
  410         mtx_unlock(&nfs_reqq_mtx);
  411         return (0);
  412 }
  413 
  414 /*
  415  * NFS disconnect. Clean up and unlink.
  416  */
  417 void
  418 nfs_disconnect(struct nfsmount *nmp)
  419 {
  420         struct socket *so;
  421 
  422         NET_ASSERT_GIANT();
  423 
  424         if (nmp->nm_so) {
  425                 so = nmp->nm_so;
  426                 nmp->nm_so = NULL;
  427                 SOCKBUF_LOCK(&so->so_rcv);
  428                 so->so_upcallarg = NULL;
  429                 so->so_upcall = NULL;
  430                 so->so_rcv.sb_flags &= ~SB_UPCALL;
  431                 SOCKBUF_UNLOCK(&so->so_rcv);
  432                 soshutdown(so, SHUT_WR);
  433                 soclose(so);
  434         }
  435 }
  436 
  437 void
  438 nfs_safedisconnect(struct nfsmount *nmp)
  439 {
  440         struct nfsreq dummyreq;
  441 
  442         bzero(&dummyreq, sizeof(dummyreq));
  443         dummyreq.r_nmp = nmp;
  444         nfs_disconnect(nmp);
  445 }
  446 
  447 /*
  448  * This is the nfs send routine. For connection based socket types, it
  449  * must be called with an nfs_sndlock() on the socket.
  450  * - return EINTR if the RPC is terminated, 0 otherwise
  451  * - set R_MUSTRESEND if the send fails for any reason
  452  * - do any cleanup required by recoverable socket errors (?)
  453  */
  454 int
  455 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top,
  456     struct nfsreq *rep)
  457 {
  458         struct sockaddr *sendnam;
  459         int error, error2, soflags, flags;
  460 
  461         NET_ASSERT_GIANT();
  462 
  463         KASSERT(rep, ("nfs_send: called with rep == NULL"));
  464 
  465         error = nfs_sigintr(rep->r_nmp, rep, rep->r_td);
  466         if (error) {
  467                 m_freem(top);
  468                 return (error);
  469         }
  470         if ((so = rep->r_nmp->nm_so) == NULL) {
  471                 rep->r_flags |= R_MUSTRESEND;
  472                 m_freem(top);
  473                 return (0);
  474         }
  475         rep->r_flags &= ~R_MUSTRESEND;
  476         soflags = rep->r_nmp->nm_soflags;
  477 
  478         if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
  479                 sendnam = NULL;
  480         else
  481                 sendnam = nam;
  482         if (so->so_type == SOCK_SEQPACKET)
  483                 flags = MSG_EOR;
  484         else
  485                 flags = 0;
  486 
  487         error = so->so_proto->pr_usrreqs->pru_sosend(so, sendnam, 0, top, 0,
  488                                                      flags, curthread /*XXX*/);
  489         if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
  490                 error = 0;
  491                 rep->r_flags |= R_MUSTRESEND;
  492         }
  493 
  494         if (error) {
  495                 /*
  496                  * Don't report EPIPE errors on nfs sockets.
  497                  * These can be due to idle tcp mounts which will be closed by
  498                  * netapp, solaris, etc. if left idle too long.
  499                  */
  500                 if (error != EPIPE) {
  501                         log(LOG_INFO, "nfs send error %d for server %s\n",
  502                             error,
  503                             rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
  504                 }
  505                 /*
  506                  * Deal with errors for the client side.
  507                  */
  508                 error2 = NFS_SIGREP(rep);
  509                 if (error2)
  510                         error = error2;
  511                 else
  512                         rep->r_flags |= R_MUSTRESEND;
  513 
  514                 /*
  515                  * Handle any recoverable (soft) socket errors here. (?)
  516                  */
  517                 if (error != EINTR && error != ERESTART && error != EIO &&
  518                         error != EWOULDBLOCK && error != EPIPE)
  519                         error = 0;
  520         }
  521         return (error);
  522 }
  523 
  524 int
  525 nfs_reply(struct nfsreq *rep)
  526 {
  527         register struct socket *so;
  528         register struct mbuf *m;
  529         int error = 0, sotype, slpflag;
  530 
  531         NET_ASSERT_GIANT();
  532 
  533         sotype = rep->r_nmp->nm_sotype;
  534         /*
  535          * For reliable protocols, lock against other senders/receivers
  536          * in case a reconnect is necessary.
  537          */
  538         if (sotype != SOCK_DGRAM) {
  539                 error = nfs_sndlock(rep);
  540                 if (error)
  541                         return (error);
  542 tryagain:
  543                 if (rep->r_mrep) {
  544                         nfs_sndunlock(rep);
  545                         return (0);
  546                 }
  547                 if (rep->r_flags & R_SOFTTERM) {
  548                         nfs_sndunlock(rep);
  549                         return (EINTR);
  550                 }
  551                 so = rep->r_nmp->nm_so;
  552                 mtx_lock(&rep->r_nmp->nm_nfstcpstate.mtx);
  553                 if (!so || 
  554                     (rep->r_nmp->nm_nfstcpstate.flags & NFS_TCP_FORCE_RECONNECT)) {
  555                         mtx_unlock(&rep->r_nmp->nm_nfstcpstate.mtx);
  556                         error = nfs_reconnect(rep);
  557                         if (error) {
  558                                 nfs_sndunlock(rep);
  559                                 return (error);
  560                         }
  561                         goto tryagain;
  562                 } else
  563                         mtx_unlock(&rep->r_nmp->nm_nfstcpstate.mtx);
  564                 while (rep->r_flags & R_MUSTRESEND) {
  565                         m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
  566                         nfsstats.rpcretries++;
  567                         error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
  568                         if (error) {
  569                                 if (error == EINTR || error == ERESTART ||
  570                                     (error = nfs_reconnect(rep)) != 0) {
  571                                         nfs_sndunlock(rep);
  572                                         return (error);
  573                                 }
  574                                 goto tryagain;
  575                         }
  576                 }
  577                 nfs_sndunlock(rep);
  578         }
  579         slpflag = 0;
  580         if (rep->r_nmp->nm_flag & NFSMNT_INT)
  581                 slpflag = PCATCH;
  582         mtx_lock(&nfs_reply_mtx);
  583         while ((rep->r_mrep == NULL) && (error == 0) && 
  584                ((rep->r_flags & R_SOFTTERM) == 0) &&
  585                ((sotype == SOCK_DGRAM) || ((rep->r_flags & R_MUSTRESEND) == 0)))
  586                 error = msleep((caddr_t)rep, &nfs_reply_mtx, 
  587                                slpflag | (PZERO - 1), "nfsreq", 0);
  588         mtx_unlock(&nfs_reply_mtx);
  589         if (error == EINTR || error == ERESTART)
  590                 /* NFS operations aren't restartable. Map ERESTART to EINTR */
  591                 return (EINTR);
  592         if (rep->r_flags & R_SOFTTERM)
  593                 /* Request was terminated because we exceeded the retries (soft mount) */
  594                 return (ETIMEDOUT);
  595         if (sotype == SOCK_STREAM) {
  596                 mtx_lock(&rep->r_nmp->nm_nfstcpstate.mtx);
  597                 if (((rep->r_nmp->nm_nfstcpstate.flags & NFS_TCP_FORCE_RECONNECT) || 
  598                      (rep->r_flags & R_MUSTRESEND))) {
  599                         mtx_unlock(&rep->r_nmp->nm_nfstcpstate.mtx);    
  600                         error = nfs_sndlock(rep);
  601                         if (error)
  602                                 return (error);
  603                         goto tryagain;
  604                 } else
  605                         mtx_unlock(&rep->r_nmp->nm_nfstcpstate.mtx);
  606         }
  607         return (error);
  608 }
  609 
  610 /*
  611  * XXX TO DO
  612  * Make nfs_realign() non-blocking. Also make nfsm_dissect() nonblocking.
  613  */
  614 static void
  615 nfs_clnt_match_xid(struct socket *so, 
  616                    struct nfsmount *nmp, 
  617                    struct mbuf *mrep)
  618 {
  619         struct mbuf *md;
  620         caddr_t dpos;
  621         u_int32_t rxid, *tl;
  622         struct nfsreq *rep;
  623         register int32_t t1;
  624         int error;
  625         
  626         /*
  627          * Search for any mbufs that are not a multiple of 4 bytes long
  628          * or with m_data not longword aligned.
  629          * These could cause pointer alignment problems, so copy them to
  630          * well aligned mbufs.
  631          */
  632         if (nfs_realign(&mrep, 5 * NFSX_UNSIGNED) == ENOMEM) {
  633                 m_freem(mrep);
  634                 nfsstats.rpcinvalid++;
  635                 return;
  636         }
  637         
  638         /*
  639          * Get the xid and check that it is an rpc reply
  640          */
  641         md = mrep;
  642         dpos = mtod(md, caddr_t);
  643         tl = nfsm_dissect_nonblock(u_int32_t *, 2*NFSX_UNSIGNED);
  644         rxid = *tl++;
  645         if (*tl != rpc_reply) {
  646                 m_freem(mrep);
  647 nfsmout:
  648                 nfsstats.rpcinvalid++;
  649                 return;
  650         }
  651 
  652         mtx_lock(&nfs_reqq_mtx);
  653         /*
  654          * Loop through the request list to match up the reply
  655          * Iff no match, just drop the datagram
  656          */
  657         TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
  658                 if (rep->r_mrep == NULL && rxid == rep->r_xid) {
  659                         /* Found it.. */
  660                         rep->r_mrep = mrep;
  661                         rep->r_md = md;
  662                         rep->r_dpos = dpos;
  663                         /*
  664                          * Update congestion window.
  665                          * Do the additive increase of
  666                          * one rpc/rtt.
  667                          */
  668                         if (nmp->nm_cwnd <= nmp->nm_sent) {
  669                                 nmp->nm_cwnd +=
  670                                         (NFS_CWNDSCALE * NFS_CWNDSCALE +
  671                                          (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
  672                                 if (nmp->nm_cwnd > NFS_MAXCWND)
  673                                         nmp->nm_cwnd = NFS_MAXCWND;
  674                         }       
  675                         if (rep->r_flags & R_SENT) {
  676                                 rep->r_flags &= ~R_SENT;
  677                                 nmp->nm_sent -= NFS_CWNDSCALE;
  678                         }
  679                         /*
  680                          * Update rtt using a gain of 0.125 on the mean
  681                          * and a gain of 0.25 on the deviation.
  682                          */
  683                         if (rep->r_flags & R_TIMING) {
  684                                 /*
  685                                  * Since the timer resolution of
  686                                  * NFS_HZ is so course, it can often
  687                                  * result in r_rtt == 0. Since
  688                                  * r_rtt == N means that the actual
  689                                  * rtt is between N+dt and N+2-dt ticks,
  690                                  * add 1.
  691                                  */
  692                                 t1 = rep->r_rtt + 1;
  693                                 t1 -= (NFS_SRTT(rep) >> 3);
  694                                 NFS_SRTT(rep) += t1;
  695                                 if (t1 < 0)
  696                                         t1 = -t1;
  697                                 t1 -= (NFS_SDRTT(rep) >> 2);
  698                                 NFS_SDRTT(rep) += t1;
  699                         }
  700                         nmp->nm_timeouts = 0;
  701                         break;
  702                 }
  703         }
  704         /*
  705          * If not matched to a request, drop it.
  706          * If it's mine, wake up requestor.
  707          */
  708         if (rep == 0) {
  709                 nfsstats.rpcunexpected++;
  710                 m_freem(mrep);
  711         } else
  712                 wakeup_nfsreq(rep);
  713         mtx_unlock(&nfs_reqq_mtx);
  714 }
  715 
  716 /* 
  717  * The wakeup of the requestor should be done under the mutex
  718  * to avoid potential missed wakeups.
  719  */
  720 static void 
  721 wakeup_nfsreq(struct nfsreq *req)
  722 {
  723         mtx_lock(&nfs_reply_mtx);
  724         wakeup((caddr_t)req);
  725         mtx_unlock(&nfs_reply_mtx);     
  726 }
  727 
  728 static void
  729 nfs_mark_for_reconnect(struct nfsmount *nmp)
  730 {
  731         struct nfsreq *rp;
  732 
  733         mtx_lock(&nmp->nm_nfstcpstate.mtx);
  734         nmp->nm_nfstcpstate.flags |= NFS_TCP_FORCE_RECONNECT;
  735         mtx_unlock(&nmp->nm_nfstcpstate.mtx);
  736         /* 
  737          * Wakeup all processes that are waiting for replies 
  738          * on this mount point. One of them does the reconnect.
  739          */
  740         mtx_lock(&nfs_reqq_mtx);
  741         TAILQ_FOREACH(rp, &nfs_reqq, r_chain) {
  742                 if (rp->r_nmp == nmp) {
  743                         rp->r_flags |= R_MUSTRESEND;
  744                         wakeup_nfsreq(rp);
  745                 }
  746         }
  747         mtx_unlock(&nfs_reqq_mtx);
  748 }
  749 
  750 static int
  751 nfstcp_readable(struct socket *so, int bytes)
  752 {
  753         int retval;
  754         
  755         SOCKBUF_LOCK(&so->so_rcv);
  756         retval = (so->so_rcv.sb_cc >= (bytes) ||
  757                   (so->so_state & SBS_CANTRCVMORE) ||
  758                   so->so_error);
  759         SOCKBUF_UNLOCK(&so->so_rcv);
  760         return (retval);
  761 }
  762 
  763 #define nfstcp_marker_readable(so)      nfstcp_readable(so, sizeof(u_int32_t))
  764 
  765 static void
  766 nfs_clnt_tcp_soupcall(struct socket *so, void *arg, int waitflag)
  767 {
  768         struct nfsmount *nmp = (struct nfsmount *)arg;
  769         struct mbuf *mp = NULL;
  770         struct uio auio;
  771         int error;
  772         u_int32_t len;
  773         int rcvflg;
  774 
  775         /*
  776          * Don't pick any more data from the socket if we've marked the 
  777          * mountpoint for reconnect.
  778          */
  779         mtx_lock(&nmp->nm_nfstcpstate.mtx);
  780         if (nmp->nm_nfstcpstate.flags & NFS_TCP_FORCE_RECONNECT) {
  781                 mtx_unlock(&nmp->nm_nfstcpstate.mtx);           
  782                 return;
  783         } else                  
  784                 mtx_unlock(&nmp->nm_nfstcpstate.mtx);
  785         auio.uio_td = curthread;
  786         auio.uio_segflg = UIO_SYSSPACE;
  787         auio.uio_rw = UIO_READ;
  788         for ( ; ; ) {
  789                 if (nmp->nm_nfstcpstate.flags & NFS_TCP_EXPECT_RPCMARKER) {
  790                         if (!nfstcp_marker_readable(so)) {
  791                                 /* Marker is not readable */
  792                                 return;
  793                         }
  794                         auio.uio_resid = sizeof(u_int32_t);
  795                         auio.uio_iov = NULL;
  796                         auio.uio_iovcnt = 0;
  797                         mp = NULL;
  798                         rcvflg = (MSG_DONTWAIT | MSG_SOCALLBCK);
  799                         error =  so->so_proto->pr_usrreqs->pru_soreceive
  800                                 (so, (struct sockaddr **)0,
  801                                  &auio, &mp, (struct mbuf **)0, &rcvflg);
  802                         /*
  803                          * We've already tested that the socket is readable. 2 cases 
  804                          * here, we either read 0 bytes (client closed connection), 
  805                          * or got some other error. In both cases, we tear down the 
  806                          * connection.
  807                          */
  808                         if (error || auio.uio_resid > 0) {
  809                                 if (error != ECONNRESET) {
  810                                         log(LOG_ERR, 
  811                                             "nfs/tcp clnt: Error %d reading socket, tearing down TCP connection\n",
  812                                             error);
  813                                 }
  814                                 goto mark_reconnect;
  815                         }
  816                         if (mp == NULL)
  817                                 panic("nfs_clnt_tcp_soupcall: Got empty mbuf chain from sorecv\n");
  818                         bcopy(mtod(mp, u_int32_t *), &len, sizeof(len));
  819                         len = ntohl(len) & ~0x80000000;
  820                         m_freem(mp);
  821                         /*
  822                          * This is SERIOUS! We are out of sync with the sender
  823                          * and forcing a disconnect/reconnect is all I can do.
  824                          */
  825                         if (len > NFS_MAXPACKET || len == 0) {
  826                                 log(LOG_ERR, "%s (%d) from nfs server %s\n",
  827                                     "impossible packet length",
  828                                     len,
  829                                     nmp->nm_mountp->mnt_stat.f_mntfromname);
  830                                 goto mark_reconnect;
  831                         }
  832                         nmp->nm_nfstcpstate.rpcresid = len;
  833                         nmp->nm_nfstcpstate.flags &= ~(NFS_TCP_EXPECT_RPCMARKER);
  834                 }
  835                 /* 
  836                  * Processed RPC marker or no RPC marker to process. 
  837                  * Pull in and process data.
  838                  */
  839                 if (nmp->nm_nfstcpstate.rpcresid > 0) {
  840                         if (!nfstcp_readable(so, nmp->nm_nfstcpstate.rpcresid)) {
  841                                 /* All data not readable */
  842                                 return;
  843                         }
  844                         auio.uio_resid = nmp->nm_nfstcpstate.rpcresid;
  845                         auio.uio_iov = NULL;
  846                         auio.uio_iovcnt = 0;
  847                         mp = NULL;
  848                         rcvflg = (MSG_DONTWAIT | MSG_SOCALLBCK);
  849                         error =  so->so_proto->pr_usrreqs->pru_soreceive
  850                                 (so, (struct sockaddr **)0,
  851                                  &auio, &mp, (struct mbuf **)0, &rcvflg);
  852                         if (error || auio.uio_resid > 0) {
  853                                 if (error != ECONNRESET) {
  854                                         log(LOG_ERR, 
  855                                             "nfs/tcp clnt: Error %d reading socket, tearing down TCP connection\n",
  856                                             error);
  857                                 }
  858                                 goto mark_reconnect;                            
  859                         }
  860                         if (mp == NULL)
  861                                 panic("nfs_clnt_tcp_soupcall: Got empty mbuf chain from sorecv\n");
  862                         nmp->nm_nfstcpstate.rpcresid = 0;
  863                         nmp->nm_nfstcpstate.flags |= NFS_TCP_EXPECT_RPCMARKER;
  864                         /* We got the entire RPC reply. Match XIDs and wake up requestor */
  865                         nfs_clnt_match_xid(so, nmp, mp);
  866                 }
  867         }
  868 
  869 mark_reconnect:
  870         nfs_mark_for_reconnect(nmp);
  871 }
  872 
  873 static void
  874 nfs_clnt_udp_soupcall(struct socket *so, void *arg, int waitflag)
  875 {
  876         struct nfsmount *nmp = (struct nfsmount *)arg;
  877         struct uio auio;
  878         struct mbuf *mp = NULL;
  879         struct mbuf *control = NULL;
  880         int error, rcvflag;
  881 
  882         auio.uio_resid = 1000000;
  883         auio.uio_td = curthread;
  884         rcvflag = MSG_DONTWAIT;
  885         auio.uio_resid = 1000000000;
  886         do {
  887                 mp = control = NULL;
  888                 error = so->so_proto->pr_usrreqs->pru_soreceive(so,
  889                                         NULL, &auio, &mp,
  890                                         &control, &rcvflag);
  891                 if (control)
  892                         m_freem(control);
  893                 if (mp)
  894                         nfs_clnt_match_xid(so, nmp, mp);
  895         } while (mp && !error);
  896 }
  897 
  898 /*
  899  * nfs_request - goes something like this
  900  *      - fill in request struct
  901  *      - links it into list
  902  *      - calls nfs_send() for first transmit
  903  *      - calls nfs_receive() to get reply
  904  *      - break down rpc header and return with nfs reply pointed to
  905  *        by mrep or error
  906  * nb: always frees up mreq mbuf list
  907  */
  908 /* XXX overloaded before */
  909 #define NQ_TRYLATERDEL  15      /* Initial try later delay (sec) */
  910 
  911 int
  912 nfs_request(struct vnode *vp, struct mbuf *mrest, int procnum,
  913     struct thread *td, struct ucred *cred, struct mbuf **mrp,
  914     struct mbuf **mdp, caddr_t *dposp)
  915 {
  916         struct mbuf *mrep, *m2;
  917         struct nfsreq *rep;
  918         u_int32_t *tl;
  919         int i;
  920         struct nfsmount *nmp;
  921         struct mbuf *m, *md, *mheadend;
  922         time_t waituntil;
  923         caddr_t dpos;
  924         int s, error = 0, mrest_len, auth_len, auth_type;
  925         int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0;
  926         struct timeval now;
  927         u_int32_t xid;
  928 
  929         /* Reject requests while attempting a forced unmount. */
  930         if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
  931                 m_freem(mrest);
  932                 return (ESTALE);
  933         }
  934         nmp = VFSTONFS(vp->v_mount);
  935         if ((nmp->nm_flag & NFSMNT_NFSV4) != 0)
  936                 return nfs4_request(vp, mrest, procnum, td, cred, mrp, mdp, dposp);
  937         MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
  938         rep->r_mrep = rep->r_md = NULL;
  939         rep->r_nmp = nmp;
  940         rep->r_vp = vp;
  941         rep->r_td = td;
  942         rep->r_procnum = procnum;
  943 
  944         getmicrouptime(&now);
  945         rep->r_lastmsg = now.tv_sec -
  946             ((nmp->nm_tprintf_delay) - (nmp->nm_tprintf_initial_delay));
  947         mrest_len = m_length(mrest, NULL);
  948 
  949         /*
  950          * Get the RPC header with authorization.
  951          */
  952         auth_type = RPCAUTH_UNIX;
  953         if (cred->cr_ngroups < 1)
  954                 panic("nfsreq nogrps");
  955         auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
  956                 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
  957                 5 * NFSX_UNSIGNED;
  958         m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len,
  959              mrest, mrest_len, &mheadend, &xid);
  960 
  961         /*
  962          * For stream protocols, insert a Sun RPC Record Mark.
  963          */
  964         if (nmp->nm_sotype == SOCK_STREAM) {
  965                 M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT);
  966                 *mtod(m, u_int32_t *) = htonl(0x80000000 |
  967                          (m->m_pkthdr.len - NFSX_UNSIGNED));
  968         }
  969         rep->r_mreq = m;
  970         rep->r_xid = xid;
  971 tryagain:
  972         if (nmp->nm_flag & NFSMNT_SOFT)
  973                 rep->r_retry = nmp->nm_retry;
  974         else
  975                 rep->r_retry = NFS_MAXREXMIT + 1;       /* past clip limit */
  976         rep->r_rtt = rep->r_rexmit = 0;
  977         if (proct[procnum] > 0)
  978                 rep->r_flags = R_TIMING;
  979         else
  980                 rep->r_flags = 0;
  981         rep->r_mrep = NULL;
  982 
  983         /*
  984          * Do the client side RPC.
  985          */
  986         nfsstats.rpcrequests++;
  987         /*
  988          * Chain request into list of outstanding requests. Be sure
  989          * to put it LAST so timer finds oldest requests first.
  990          */
  991         s = splsoftclock();
  992         mtx_lock(&nfs_reqq_mtx);
  993         if (TAILQ_EMPTY(&nfs_reqq))
  994                 callout_reset(&nfs_callout, nfs_ticks, nfs_timer, NULL);
  995         TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
  996         mtx_unlock(&nfs_reqq_mtx);
  997 
  998         /*
  999          * If backing off another request or avoiding congestion, don't
 1000          * send this one now but let timer do it. If not timing a request,
 1001          * do it now.
 1002          */
 1003         if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
 1004                 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
 1005                 nmp->nm_sent < nmp->nm_cwnd)) {
 1006                 splx(s);
 1007                 error = nfs_sndlock(rep);
 1008                 if (!error) {
 1009                         m2 = m_copym(m, 0, M_COPYALL, M_TRYWAIT);
 1010                         error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
 1011                         nfs_sndunlock(rep);
 1012                 }
 1013                 mtx_lock(&nfs_reqq_mtx);
 1014                 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
 1015                         nmp->nm_sent += NFS_CWNDSCALE;
 1016                         rep->r_flags |= R_SENT;
 1017                 }
 1018                 mtx_unlock(&nfs_reqq_mtx);
 1019         } else {
 1020                 splx(s);
 1021                 rep->r_rtt = -1;
 1022         }
 1023 
 1024         /*
 1025          * Wait for the reply from our send or the timer's.
 1026          */
 1027         if (!error || error == EPIPE)
 1028                 error = nfs_reply(rep);
 1029 
 1030         /*
 1031          * RPC done, unlink the request.
 1032          */
 1033         s = splsoftclock();
 1034         mtx_lock(&nfs_reqq_mtx);
 1035         TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
 1036         if (TAILQ_EMPTY(&nfs_reqq))
 1037                 callout_stop(&nfs_callout);
 1038         /*
 1039          * Decrement the outstanding request count.
 1040          */
 1041         if (rep->r_flags & R_SENT) {
 1042                 rep->r_flags &= ~R_SENT;        /* paranoia */
 1043                 nmp->nm_sent -= NFS_CWNDSCALE;
 1044         }
 1045         mtx_unlock(&nfs_reqq_mtx);
 1046         splx(s);
 1047 
 1048         /*
 1049          * If there was a successful reply and a tprintf msg.
 1050          * tprintf a response.
 1051          */
 1052         if (!error) {
 1053                 mtx_lock(&Giant);
 1054                 nfs_up(rep, nmp, rep->r_td, "is alive again", NFSSTA_TIMEO);
 1055                 mtx_unlock(&Giant);
 1056         }
 1057         mrep = rep->r_mrep;
 1058         md = rep->r_md;
 1059         dpos = rep->r_dpos;
 1060         if (error) {
 1061                 /*
 1062                  * If we got interrupted by a signal in nfs_reply(), there's
 1063                  * a very small window where the reply could've come in before
 1064                  * this process got scheduled in. To handle that case, we need 
 1065                  * to free the reply if it was delivered.
 1066                  */
 1067                 if (rep->r_mrep != NULL)
 1068                         m_freem(rep->r_mrep);
 1069                 m_freem(rep->r_mreq);
 1070                 free((caddr_t)rep, M_NFSREQ);
 1071                 return (error);
 1072         }
 1073 
 1074         if (rep->r_mrep == NULL)
 1075                 panic("nfs_request: rep->r_mrep shouldn't be NULL if no error\n");
 1076 
 1077         /*
 1078          * break down the rpc header and check if ok
 1079          */
 1080         tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 1081         if (*tl++ == rpc_msgdenied) {
 1082                 if (*tl == rpc_mismatch)
 1083                         error = EOPNOTSUPP;
 1084                 else
 1085                         error = EACCES;
 1086                 m_freem(mrep);
 1087                 m_freem(rep->r_mreq);
 1088                 free((caddr_t)rep, M_NFSREQ);
 1089                 return (error);
 1090         }
 1091 
 1092         /*
 1093          * Just throw away any verifyer (ie: kerberos etc).
 1094          */
 1095         i = fxdr_unsigned(int, *tl++);          /* verf type */
 1096         i = fxdr_unsigned(int32_t, *tl);        /* len */
 1097         if (i > 0)
 1098                 nfsm_adv(nfsm_rndup(i));
 1099         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 1100         /* 0 == ok */
 1101         if (*tl == 0) {
 1102                 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 1103                 if (*tl != 0) {
 1104                         error = fxdr_unsigned(int, *tl);
 1105                         if ((nmp->nm_flag & NFSMNT_NFSV3) &&
 1106                                 error == NFSERR_TRYLATER) {
 1107                                 m_freem(mrep);
 1108                                 error = 0;
 1109                                 waituntil = time_second + trylater_delay;
 1110                                 while (time_second < waituntil)
 1111                                         (void) tsleep(&lbolt,
 1112                                                 PSOCK, "nqnfstry", 0);
 1113                                 trylater_delay *= nfs_backoff[trylater_cnt];
 1114                                 if (trylater_cnt < NFS_NBACKOFF - 1)
 1115                                         trylater_cnt++;
 1116                                 goto tryagain;
 1117                         }
 1118 
 1119                         /*
 1120                          * If the File Handle was stale, invalidate the
 1121                          * lookup cache, just in case.
 1122                          */
 1123                         if (error == ESTALE)
 1124                                 cache_purge(vp);
 1125                         if (nmp->nm_flag & NFSMNT_NFSV3) {
 1126                                 *mrp = mrep;
 1127                                 *mdp = md;
 1128                                 *dposp = dpos;
 1129                                 error |= NFSERR_RETERR;
 1130                         } else
 1131                                 m_freem(mrep);
 1132                         m_freem(rep->r_mreq);
 1133                         free((caddr_t)rep, M_NFSREQ);
 1134                         return (error);
 1135                 }
 1136 
 1137                 *mrp = mrep;
 1138                 *mdp = md;
 1139                 *dposp = dpos;
 1140                 m_freem(rep->r_mreq);
 1141                 FREE((caddr_t)rep, M_NFSREQ);
 1142                 return (0);
 1143         }
 1144         m_freem(mrep);
 1145         error = EPROTONOSUPPORT;
 1146 nfsmout:
 1147         m_freem(rep->r_mreq);
 1148         free((caddr_t)rep, M_NFSREQ);
 1149         return (error);
 1150 }
 1151 
 1152 /*
 1153  * Nfs timer routine
 1154  * Scan the nfsreq list and retranmit any requests that have timed out
 1155  * To avoid retransmission attempts on STREAM sockets (in the future) make
 1156  * sure to set the r_retry field to 0 (implies nm_retry == 0).
 1157  * 
 1158  * XXX - 
 1159  * For now, since we don't register MPSAFE callouts for the NFS client -
 1160  * softclock() acquires Giant before calling us. That prevents req entries
 1161  * from being removed from the list (from nfs_request()). But we still 
 1162  * acquire the nfs reqq mutex to make sure the state of individual req
 1163  * entries is not modified from RPC reply handling (from socket callback)
 1164  * while nfs_timer is walking the list of reqs.
 1165  * The nfs reqq lock cannot be held while we do the pru_send() because of a
 1166  * lock ordering violation. The NFS client socket callback acquires 
 1167  * inp_lock->nfsreq mutex and pru_send acquires inp_lock. So we drop the 
 1168  * reqq mutex (and reacquire it after the pru_send()). This won't work
 1169  * when we move to fine grained locking for NFS. When we get to that point, 
 1170  * a rewrite of nfs_timer() will be needed.
 1171  */
 1172 void
 1173 nfs_timer(void *arg)
 1174 {
 1175         struct nfsreq *rep;
 1176         struct mbuf *m;
 1177         struct socket *so;
 1178         struct nfsmount *nmp;
 1179         int timeo;
 1180         int s, error;
 1181         struct timeval now;
 1182 
 1183         getmicrouptime(&now);
 1184         s = splnet();
 1185         mtx_lock(&Giant);       /* nfs_down -> tprintf */
 1186         mtx_lock(&nfs_reqq_mtx);
 1187         TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
 1188                 nmp = rep->r_nmp;
 1189                 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
 1190                         continue;
 1191                 if (nfs_sigintr(nmp, rep, rep->r_td))
 1192                         continue;
 1193                 if (nmp->nm_tprintf_initial_delay != 0 &&
 1194                     (rep->r_rexmit > 2 || (rep->r_flags & R_RESENDERR)) &&
 1195                     rep->r_lastmsg + nmp->nm_tprintf_delay < now.tv_sec) {
 1196                         rep->r_lastmsg = now.tv_sec;
 1197                         nfs_down(rep, nmp, rep->r_td, "not responding",
 1198                             0, NFSSTA_TIMEO);
 1199 #if 0
 1200                         if (!(nmp->nm_state & NFSSTA_MOUNTED)) {
 1201                                 /* we're not yet completely mounted and */
 1202                                 /* we can't complete an RPC, so we fail */
 1203                                 nfsstats.rpctimeouts++;
 1204                                 nfs_softterm(rep);
 1205                                 continue;
 1206                         }
 1207 #endif
 1208                 }
 1209                 if (rep->r_rtt >= 0) {
 1210                         rep->r_rtt++;
 1211                         if (nmp->nm_flag & NFSMNT_DUMBTIMR)
 1212                                 timeo = nmp->nm_timeo;
 1213                         else
 1214                                 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
 1215                         if (nmp->nm_timeouts > 0)
 1216                                 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
 1217                         if (rep->r_rtt <= timeo)
 1218                                 continue;
 1219                         if (nmp->nm_timeouts < NFS_NBACKOFF)
 1220                                 nmp->nm_timeouts++;
 1221                 }
 1222                 if (rep->r_rexmit >= rep->r_retry) {    /* too many */
 1223                         nfsstats.rpctimeouts++;
 1224                         nfs_softterm(rep);
 1225                         continue;
 1226                 }
 1227                 if (nmp->nm_sotype != SOCK_DGRAM) {
 1228                         if (++rep->r_rexmit > NFS_MAXREXMIT)
 1229                                 rep->r_rexmit = NFS_MAXREXMIT;
 1230                         /*
 1231                          * For NFS/TCP, setting R_MUSTRESEND and waking up 
 1232                          * the requester will cause the request to be   
 1233                          * retransmitted (in nfs_reply()), re-connecting
 1234                          * if necessary.
 1235                          */
 1236                         rep->r_flags |= R_MUSTRESEND;
 1237                         wakeup_nfsreq(rep);
 1238                         continue;
 1239                 }
 1240                 if ((so = nmp->nm_so) == NULL)
 1241                         continue;
 1242                 /*
 1243                  * If there is enough space and the window allows..
 1244                  *      Resend it
 1245                  * Set r_rtt to -1 in case we fail to send it now.
 1246                  */
 1247                 rep->r_rtt = -1;
 1248                 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
 1249                    ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
 1250                     (rep->r_flags & R_SENT) ||
 1251                     nmp->nm_sent < nmp->nm_cwnd) &&
 1252                    (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
 1253                         mtx_unlock(&nfs_reqq_mtx);
 1254                         if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
 1255                             error = (*so->so_proto->pr_usrreqs->pru_send)
 1256                                     (so, 0, m, NULL, NULL, curthread);
 1257                         else
 1258                             error = (*so->so_proto->pr_usrreqs->pru_send)
 1259                                     (so, 0, m, nmp->nm_nam, NULL, curthread);
 1260                         mtx_lock(&nfs_reqq_mtx);
 1261                         if (error) {
 1262                                 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
 1263                                         so->so_error = 0;
 1264                                 rep->r_flags |= R_RESENDERR;
 1265                         } else {
 1266                                 /*
 1267                                  * Iff first send, start timing
 1268                                  * else turn timing off, backoff timer
 1269                                  * and divide congestion window by 2.
 1270                                  */
 1271                                 rep->r_flags &= ~R_RESENDERR;
 1272                                 if (rep->r_flags & R_SENT) {
 1273                                         rep->r_flags &= ~R_TIMING;
 1274                                         if (++rep->r_rexmit > NFS_MAXREXMIT)
 1275                                                 rep->r_rexmit = NFS_MAXREXMIT;
 1276                                         nmp->nm_cwnd >>= 1;
 1277                                         if (nmp->nm_cwnd < NFS_CWNDSCALE)
 1278                                                 nmp->nm_cwnd = NFS_CWNDSCALE;
 1279                                         nfsstats.rpcretries++;
 1280                                 } else {
 1281                                         rep->r_flags |= R_SENT;
 1282                                         nmp->nm_sent += NFS_CWNDSCALE;
 1283                                 }
 1284                                 rep->r_rtt = 0;
 1285                         }
 1286                 }
 1287         }
 1288         mtx_unlock(&nfs_reqq_mtx);
 1289         mtx_unlock(&Giant);     /* nfs_down -> tprintf */
 1290         splx(s);
 1291         callout_reset(&nfs_callout, nfs_ticks, nfs_timer, NULL);
 1292 }
 1293 
 1294 /*
 1295  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
 1296  * wait for all requests to complete. This is used by forced unmounts
 1297  * to terminate any outstanding RPCs.
 1298  */
 1299 int
 1300 nfs_nmcancelreqs(nmp)
 1301         struct nfsmount *nmp;
 1302 {
 1303         struct nfsreq *req;
 1304         int i, s;
 1305 
 1306         s = splnet();
 1307         mtx_lock(&nfs_reqq_mtx);
 1308         TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
 1309                 if (nmp != req->r_nmp || req->r_mrep != NULL ||
 1310                     (req->r_flags & R_SOFTTERM))
 1311                         continue;
 1312                 nfs_softterm(req);
 1313         }
 1314         mtx_unlock(&nfs_reqq_mtx);
 1315         splx(s);
 1316 
 1317         for (i = 0; i < 30; i++) {
 1318                 s = splnet();
 1319                 mtx_lock(&nfs_reqq_mtx);
 1320                 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
 1321                         if (nmp == req->r_nmp)
 1322                                 break;
 1323                 }
 1324                 mtx_unlock(&nfs_reqq_mtx);
 1325                 splx(s);
 1326                 if (req == NULL)
 1327                         return (0);
 1328                 tsleep(&lbolt, PSOCK, "nfscancel", 0);
 1329         }
 1330         return (EBUSY);
 1331 }
 1332 
 1333 /*
 1334  * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
 1335  * The nm_send count is decremented now to avoid deadlocks when the process in
 1336  * soreceive() hasn't yet managed to send its own request.
 1337  */
 1338 
 1339 static void
 1340 nfs_softterm(struct nfsreq *rep)
 1341 {
 1342 
 1343         rep->r_flags |= R_SOFTTERM;
 1344         if (rep->r_flags & R_SENT) {
 1345                 rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
 1346                 rep->r_flags &= ~R_SENT;
 1347         }
 1348         /* 
 1349          * Request terminated, wakeup the blocked process, so that we
 1350          * can return EINTR back.
 1351          */
 1352         wakeup_nfsreq(rep);
 1353 }
 1354 
 1355 /*
 1356  * Any signal that can interrupt an NFS operation in an intr mount
 1357  * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
 1358  */
 1359 int nfs_sig_set[] = {
 1360         SIGINT,
 1361         SIGTERM,
 1362         SIGHUP,
 1363         SIGKILL,
 1364         SIGSTOP,
 1365         SIGQUIT
 1366 };
 1367 
 1368 /*
 1369  * Check to see if one of the signals in our subset is pending on
 1370  * the process (in an intr mount).
 1371  */
 1372 static int
 1373 nfs_sig_pending(sigset_t set)
 1374 {
 1375         int i;
 1376         
 1377         for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++)
 1378                 if (SIGISMEMBER(set, nfs_sig_set[i]))
 1379                         return (1);
 1380         return (0);
 1381 }
 1382  
 1383 /*
 1384  * The set/restore sigmask functions are used to (temporarily) overwrite
 1385  * the process p_sigmask during an RPC call (for example). These are also
 1386  * used in other places in the NFS client that might tsleep().
 1387  */
 1388 void
 1389 nfs_set_sigmask(struct thread *td, sigset_t *oldset)
 1390 {
 1391         sigset_t newset;
 1392         int i;
 1393         struct proc *p;
 1394         
 1395         SIGFILLSET(newset);
 1396         if (td == NULL)
 1397                 td = curthread; /* XXX */
 1398         p = td->td_proc;
 1399         /* Remove the NFS set of signals from newset */
 1400         PROC_LOCK(p);
 1401         mtx_lock(&p->p_sigacts->ps_mtx);
 1402         for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++) {
 1403                 /*
 1404                  * But make sure we leave the ones already masked
 1405                  * by the process, ie. remove the signal from the
 1406                  * temporary signalmask only if it wasn't already
 1407                  * in p_sigmask.
 1408                  */
 1409                 if (!SIGISMEMBER(td->td_sigmask, nfs_sig_set[i]) &&
 1410                     !SIGISMEMBER(p->p_sigacts->ps_sigignore, nfs_sig_set[i]))
 1411                         SIGDELSET(newset, nfs_sig_set[i]);
 1412         }
 1413         mtx_unlock(&p->p_sigacts->ps_mtx);
 1414         PROC_UNLOCK(p);
 1415         kern_sigprocmask(td, SIG_SETMASK, &newset, oldset, 0);
 1416 }
 1417 
 1418 void
 1419 nfs_restore_sigmask(struct thread *td, sigset_t *set)
 1420 {
 1421         if (td == NULL)
 1422                 td = curthread; /* XXX */
 1423         kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
 1424 }
 1425 
 1426 /*
 1427  * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
 1428  * old one after msleep() returns.
 1429  */
 1430 int
 1431 nfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
 1432 {
 1433         sigset_t oldset;
 1434         int error;
 1435         struct proc *p;
 1436         
 1437         if ((priority & PCATCH) == 0)
 1438                 return msleep(ident, mtx, priority, wmesg, timo);
 1439         if (td == NULL)
 1440                 td = curthread; /* XXX */
 1441         nfs_set_sigmask(td, &oldset);
 1442         error = msleep(ident, mtx, priority, wmesg, timo);
 1443         nfs_restore_sigmask(td, &oldset);
 1444         p = td->td_proc;
 1445         return (error);
 1446 }
 1447 
 1448 /*
 1449  * NFS wrapper to tsleep(), that shoves a new p_sigmask and restores the
 1450  * old one after tsleep() returns.
 1451  */
 1452 int
 1453 nfs_tsleep(struct thread *td, void *ident, int priority, char *wmesg, int timo)
 1454 {
 1455         sigset_t oldset;
 1456         int error;
 1457         struct proc *p;
 1458         
 1459         if ((priority & PCATCH) == 0)
 1460                 return tsleep(ident, priority, wmesg, timo);
 1461         if (td == NULL)
 1462                 td = curthread; /* XXX */
 1463         nfs_set_sigmask(td, &oldset);
 1464         error = tsleep(ident, priority, wmesg, timo);
 1465         nfs_restore_sigmask(td, &oldset);
 1466         p = td->td_proc;
 1467         return (error);
 1468 }
 1469 
 1470 /*
 1471  * Test for a termination condition pending on the process.
 1472  * This is used for NFSMNT_INT mounts.
 1473  */
 1474 int
 1475 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
 1476 {
 1477         struct proc *p;
 1478         sigset_t tmpset;
 1479 
 1480         if ((nmp->nm_flag & NFSMNT_NFSV4) != 0)
 1481                 return nfs4_sigintr(nmp, rep, td);
 1482         if (rep && (rep->r_flags & R_SOFTTERM))
 1483                 return (EIO);
 1484         /* Terminate all requests while attempting a forced unmount. */
 1485         if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
 1486                 return (EIO);
 1487         if (!(nmp->nm_flag & NFSMNT_INT))
 1488                 return (0);
 1489         if (td == NULL)
 1490                 return (0);
 1491 
 1492         p = td->td_proc;
 1493         PROC_LOCK(p);
 1494         tmpset = p->p_siglist;
 1495         SIGSETNAND(tmpset, td->td_sigmask);
 1496         mtx_lock(&p->p_sigacts->ps_mtx);
 1497         SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
 1498         mtx_unlock(&p->p_sigacts->ps_mtx);
 1499         if (SIGNOTEMPTY(p->p_siglist) && nfs_sig_pending(tmpset)) {
 1500                 PROC_UNLOCK(p);
 1501                 return (EINTR);
 1502         }
 1503         PROC_UNLOCK(p);
 1504 
 1505         return (0);
 1506 }
 1507 
 1508 /*
 1509  * Lock a socket against others.
 1510  * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
 1511  * and also to avoid race conditions between the processes with nfs requests
 1512  * in progress when a reconnect is necessary.
 1513  */
 1514 int
 1515 nfs_sndlock(struct nfsreq *rep)
 1516 {
 1517         int *statep = &rep->r_nmp->nm_state;
 1518         struct thread *td;
 1519         int error, slpflag = 0, slptimeo = 0;
 1520 
 1521         td = rep->r_td;
 1522         if (rep->r_nmp->nm_flag & NFSMNT_INT)
 1523                 slpflag = PCATCH;
 1524         while (*statep & NFSSTA_SNDLOCK) {
 1525                 error = nfs_sigintr(rep->r_nmp, rep, td);
 1526                 if (error)
 1527                         return (error);
 1528                 *statep |= NFSSTA_WANTSND;
 1529                 (void) tsleep(statep, slpflag | (PZERO - 1),
 1530                         "nfsndlck", slptimeo);
 1531                 if (slpflag == PCATCH) {
 1532                         slpflag = 0;
 1533                         slptimeo = 2 * hz;
 1534                 }
 1535         }
 1536         *statep |= NFSSTA_SNDLOCK;
 1537         return (0);
 1538 }
 1539 
 1540 /*
 1541  * Unlock the stream socket for others.
 1542  */
 1543 void
 1544 nfs_sndunlock(struct nfsreq *rep)
 1545 {
 1546         int *statep = &rep->r_nmp->nm_state;
 1547 
 1548         if ((*statep & NFSSTA_SNDLOCK) == 0)
 1549                 panic("nfs sndunlock");
 1550         *statep &= ~NFSSTA_SNDLOCK;
 1551         if (*statep & NFSSTA_WANTSND) {
 1552                 *statep &= ~NFSSTA_WANTSND;
 1553                 wakeup(statep);
 1554         }
 1555 }
 1556 
 1557 /*
 1558  *      nfs_realign:
 1559  *
 1560  *      Check for badly aligned mbuf data and realign by copying the unaligned
 1561  *      portion of the data into a new mbuf chain and freeing the portions
 1562  *      of the old chain that were replaced.
 1563  *
 1564  *      We cannot simply realign the data within the existing mbuf chain
 1565  *      because the underlying buffers may contain other rpc commands and
 1566  *      we cannot afford to overwrite them.
 1567  *
 1568  *      We would prefer to avoid this situation entirely.  The situation does
 1569  *      not occur with NFS/UDP and is supposed to only occassionally occur
 1570  *      with TCP.  Use vfs.nfs.realign_count and realign_test to check this.
 1571  *
 1572  */
 1573 static int
 1574 nfs_realign(struct mbuf **pm, int hsiz)
 1575 {
 1576         struct mbuf *m;
 1577         struct mbuf *n = NULL;
 1578         int off = 0;
 1579 
 1580         ++nfs_realign_test;
 1581         while ((m = *pm) != NULL) {
 1582                 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
 1583                         MGET(n, M_DONTWAIT, MT_DATA);
 1584                         if (n == NULL)
 1585                                 return (ENOMEM);
 1586                         if (m->m_len >= MINCLSIZE) {
 1587                                 MCLGET(n, M_DONTWAIT);
 1588                                 if (n->m_ext.ext_buf == NULL) {
 1589                                         m_freem(n);
 1590                                         return (ENOMEM);
 1591                                 }
 1592                         }
 1593                         n->m_len = 0;
 1594                         break;
 1595                 }
 1596                 pm = &m->m_next;
 1597         }
 1598         /*
 1599          * If n is non-NULL, loop on m copying data, then replace the
 1600          * portion of the chain that had to be realigned.
 1601          */
 1602         if (n != NULL) {
 1603                 ++nfs_realign_count;
 1604                 while (m) {
 1605                         m_copyback(n, off, m->m_len, mtod(m, caddr_t));
 1606                         off += m->m_len;
 1607                         m = m->m_next;
 1608                 }
 1609                 m_freem(*pm);
 1610                 *pm = n;
 1611         }
 1612         return (0);
 1613 }
 1614 
 1615 
 1616 static int
 1617 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
 1618 {
 1619         struct proc *p;
 1620 
 1621         GIANT_REQUIRED; /* tprintf */
 1622 
 1623         p = td ? td->td_proc : NULL;
 1624         if (error) {
 1625                 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
 1626                     msg, error);
 1627         } else {
 1628                 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
 1629         }
 1630         return (0);
 1631 }
 1632 
 1633 void
 1634 nfs_down(rep, nmp, td, msg, error, flags)
 1635         struct nfsreq *rep;
 1636         struct nfsmount *nmp;
 1637         struct thread *td;
 1638         const char *msg;
 1639         int error, flags;
 1640 {
 1641 
 1642         GIANT_REQUIRED; /* nfs_msg */
 1643 
 1644         if (nmp == NULL)
 1645                 return;
 1646         if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
 1647                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
 1648                     VQ_NOTRESP, 0);
 1649                 nmp->nm_state |= NFSSTA_TIMEO;
 1650         }
 1651 #ifdef NFSSTA_LOCKTIMEO
 1652         if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
 1653                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
 1654                     VQ_NOTRESPLOCK, 0);
 1655                 nmp->nm_state |= NFSSTA_LOCKTIMEO;
 1656         }
 1657 #endif
 1658         if (rep)
 1659                 rep->r_flags |= R_TPRINTFMSG;
 1660         nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
 1661 }
 1662 
 1663 void
 1664 nfs_up(rep, nmp, td, msg, flags)
 1665         struct nfsreq *rep;
 1666         struct nfsmount *nmp;
 1667         struct thread *td;
 1668         const char *msg;
 1669         int flags;
 1670 {
 1671 
 1672         GIANT_REQUIRED; /* nfs_msg */
 1673 
 1674         if (nmp == NULL)
 1675                 return;
 1676         if ((rep == NULL) || (rep->r_flags & R_TPRINTFMSG) != 0)
 1677                 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
 1678         if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
 1679                 nmp->nm_state &= ~NFSSTA_TIMEO;
 1680                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
 1681                     VQ_NOTRESP, 1);
 1682         }
 1683 #ifdef NFSSTA_LOCKTIMEO
 1684         if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
 1685                 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
 1686                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
 1687                     VQ_NOTRESPLOCK, 1);
 1688         }
 1689 #endif
 1690 }
 1691 

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