src/afs/afs_conn.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Implements:
  12  */
  13 #include <afsconfig.h>
  14 #include "afs/param.h"
  15
  16
  17 #include "afs/stds.h"
  18 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  19
  20 #if !defined(UKERNEL)
  21 #if !defined(AFS_LINUX20_ENV)
  22 #include <net/if.h>
  23 #endif
  24 #include <netinet/in.h>
  25
  26 #ifdef AFS_SGI62_ENV
  27 #include "h/hashing.h"
  28 #endif
  29 #if !defined(AFS_HPUX110_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DARWIN_ENV)
  30 #include <netinet/in_var.h>
  31 #endif /* ! AFS_HPUX110_ENV */
  32 #endif /* !defined(UKERNEL) */
  33
  34 #include "afsincludes.h"        /* Afs-based standard headers */
  35 #include "afs/afs_stats.h"      /* afs statistics */
  36
  37 #if     defined(AFS_SUN5_ENV)
  38 #include <inet/led.h>
  39 #include <inet/common.h>
  40 #include <netinet/ip6.h>
  41 #include <inet/ip.h>
  42 #endif
  43
  44 /* Exported variables */
  45 afs_rwlock_t afs_xconn;         /* allocation lock for new things */
  46 afs_rwlock_t afs_xinterface;    /* for multiple client address */
  47 afs_int32 cryptall = 1;         /* encrypt all communications */
  48
  49 /* some connection macros */
  50
  51 /* a constructor */
  52 #define new_conn_vector(xcv) \
  53 do { \
  54         xcv = (struct sa_conn_vector *) \
  55         afs_osi_Alloc(sizeof(struct sa_conn_vector)); \
  56         if (xcv) { \
  57                 memset((char *)xcv, 0, sizeof(struct sa_conn_vector)); \
  58         } \
  59 } while (0);
  60
  61 /* select a connection to return (if no connection has lower utilization
  62  * than any other) */
  63 #define conn_vec_select_conn(xcv, bix, conn) \
  64 do { \
  65     (bix) = ((xcv)->select_index)++ % CVEC_LEN; \
  66     (conn) = &((xcv)->cvec[bix]); \
  67 } while (0);
  68
  69 #define struct_conn(s) ((struct afs_conn *)(s))
  70
  71 #define REPORT_CONNECTIONS_ISSUED 0 /* enable to see utilization */
  72
  73 /**
  74  * Find a connection with call slots available, allocating one
  75  * if nothing is available and we find an allocated slot
  76  * @param xcv  A connection vector
  77  * @param create  If set, a new connection may be created
  78  */
  79 static struct afs_conn *
  80 find_preferred_connection(struct sa_conn_vector *xcv, int create)
  81 {
  82     afs_int32 cix, bix;
  83     struct afs_conn *tc = NULL;
  84
  85     bix = -1;
  86     for(cix = 0; cix < CVEC_LEN; ++cix) {
  87         tc = &(xcv->cvec[cix]);
  88         if (!tc->id) {
  89             if (create) {
  90                 tc->parent = xcv;
  91                 tc->forceConnectFS = 1;
  92                 tc->activated = 1;
  93                 bix = cix;
  94                 break;
  95             } /* create */
  96         } else {
  97             if (tc->refCount < (RX_MAXCALLS-1)) {
  98                 bix = cix;
  99                 goto f_conn;
 100             } else if (cix == (CVEC_LEN-1))
 101                 conn_vec_select_conn(xcv, bix, tc);
 102         } /* tc->id */
 103     } /* for cix < CVEC_LEN */
 104
 105     if (bix < 0) {
 106         tc = NULL;
 107         goto out;
 108     }
 109
 110 f_conn:
 111     tc->refCount++;
 112     xcv->refCount++;
 113
 114 #if REPORT_CONNECTIONS_ISSUED
 115     afs_warn("Issuing conn %d refCount=%d parent refCount=%d\n", bix,
 116              tc->refCount, xcv->refCount);
 117 #endif
 118
 119 out:
 120     return (tc);
 121
 122 }        /* find_preferred_connection */
 123
 124
 125 /**
 126  * Release all connections for unix user xu at server xs
 127  * @param xu
 128  * @param xs
 129  */
 130 static void
 131 release_conns_user_server(struct unixuser *xu, struct server *xs)
 132 {
 133     int cix, glocked;
 134     struct srvAddr *sa;
 135     struct afs_conn *tc;
 136     struct sa_conn_vector *tcv, **lcv, *tcvn;
 137     for (sa = (xs)->addr; sa; sa = sa->next_sa) {
 138         lcv = &sa->conns;
 139         for (tcv = *lcv; tcv; lcv = &tcv->next, tcv = *lcv) {
 140             if (tcv->user == (xu) && tcv->refCount == 0) {
 141                 *lcv = tcv->next;
 142                 /* our old friend, the GLOCK */
 143                 glocked = ISAFS_GLOCK();
 144                 if (glocked)
 145                     AFS_GUNLOCK();
 146                 for(cix = 0; cix < CVEC_LEN; ++cix) {
 147                     tc = &(tcv->cvec[cix]);
 148                     if (tc->activated) {
 149                         rx_SetConnSecondsUntilNatPing(tc->id, 0);
 150                         rx_DestroyConnection(tc->id);
 151                         /* find another eligible connection */
 152                         if (sa->natping == tc) {
 153                             int cin;
 154                             struct afs_conn *tcn;
 155                             for (tcvn = sa->conns; tcvn; tcvn = tcvn->next) {
 156                                 if (tcvn == tcv)
 157                                     continue;
 158                                 for(cin = 0; cin < CVEC_LEN; ++cin) {
 159                                     tcn = &(tcvn->cvec[cin]);
 160                                     if (tcn->activated) {
 161                                         rx_SetConnSecondsUntilNatPing(tcn->id, 20);
 162                                         sa->natping = tcn;
 163                                         break;
 164                                     }
 165                                 }
 166                             }
 167                         }
 168                     }
 169                 }
 170                 if (glocked)
 171                     AFS_GLOCK();
 172                 afs_osi_Free(tcv, sizeof(struct sa_conn_vector));
 173                 break;    /* at most one instance per server */
 174             } /*Found unreferenced connection for user */
 175         }
 176     } /*For each connection on the server */
 177
 178 }        /* release_conns_user_server */
 179
 180
 181 static void
 182 release_conns_vector(struct sa_conn_vector *tcv)
 183 {
 184     int cix, glocked;
 185     struct afs_conn *tc;
 186     struct sa_conn_vector *next;
 187
 188     while (tcv != NULL) {
 189         next = tcv->next;
 190
 191         /* you know it, you love it, the GLOCK */
 192         glocked = ISAFS_GLOCK();
 193         if (glocked)
 194             AFS_GUNLOCK(); \
 195         for(cix = 0; cix < CVEC_LEN; ++cix) {
 196             tc = &(tcv->cvec[cix]);
 197             if (tc->activated) {
 198                 rx_SetConnSecondsUntilNatPing(tc->id, 0);
 199                 rx_DestroyConnection(tc->id);
 200                 if (tcv->srvr->natping == tc)
 201                     tcv->srvr->natping = NULL;
 202             }
 203         }
 204         if (glocked)
 205             AFS_GLOCK();
 206         afs_osi_Free(tcv, sizeof(struct sa_conn_vector));
 207         tcv = next;
 208     }
 209
 210 }        /* release_conns_vector */
 211
 212
 213 unsigned int VNOSERVERS = 0;
 214
 215 /**
 216  * Pick a security object to use for a connection to a given server,
 217  * by a given user
 218  *
 219  * @param[in] conn
 220  *      The AFS connection for which the security object is required
 221  * @param[out] secLevel
 222  *      The security level of the returned object
 223  *
 224  * @return
 225  *      An rx security object. This function is guaranteed to return
 226  *      an object, although that object may be rxnull (with a secLevel
 227  *      of 0)
 228  */
 229 static struct rx_securityClass *
 230 afs_pickSecurityObject(struct afs_conn *conn, int *secLevel)
 231 {
 232     struct rx_securityClass *secObj = NULL;
 233     union tokenUnion *token;
 234
 235     /* Do we have tokens ? */
 236     if (conn->parent->user->states & UHasTokens) {
 237         token = afs_FindToken(conn->parent->user->tokens, RX_SECIDX_KAD);
 238         if (token) {
 239             *secLevel = RX_SECIDX_KAD;
 240             /* kerberos tickets on channel 2 */
 241             secObj = rxkad_NewClientSecurityObject(
 242                          cryptall ? rxkad_crypt : rxkad_clear,
 243                          (struct ktc_encryptionKey *)
 244                                token->rxkad.clearToken.HandShakeKey,
 245                          token->rxkad.clearToken.AuthHandle,
 246                          token->rxkad.ticketLen, token->rxkad.ticket);
 247             /* We're going to use this token, so populate the viced */
 248             conn->parent->user->viceId = token->rxkad.clearToken.ViceId;
 249         }
 250      }
 251      if (secObj == NULL) {
 252         *secLevel = 0;
 253         secObj = rxnull_NewClientSecurityObject();
 254      }
 255
 256      return secObj;
 257 }
 258
 259
 260 /**
 261  * Try setting up a connection to the server containing the specified fid.
 262  * Gets the volume, checks if it's up and does the connection by server address.
 263  *
 264  * @param afid
 265  * @param areq Request filled in by the caller.
 266  * @param locktype Type of lock that will be used.
 267  *
 268  * @return The conn struct, or NULL.
 269  */
 270 struct afs_conn *
 271 afs_Conn(struct VenusFid *afid, struct vrequest *areq,
 272          afs_int32 locktype, struct rx_connection **rxconn)
 273 {
 274     u_short fsport = AFS_FSPORT;
 275     struct volume *tv;
 276     struct afs_conn *tconn = NULL;
 277     struct srvAddr *lowp = NULL;
 278     struct unixuser *tu;
 279     int notbusy;
 280     int i;
 281     struct srvAddr *sa1p;
 282     afs_int32 replicated = -1; /* a single RO will increment to 0 */
 283
 284     *rxconn = NULL;
 285
 286     AFS_STATCNT(afs_Conn);
 287     /* Get fid's volume. */
 288     tv = afs_GetVolume(afid, areq, READ_LOCK);
 289     if (!tv) {
 290         if (areq) {
 291             afs_FinalizeReq(areq);
 292             areq->volumeError = 1;
 293         }
 294         return NULL;
 295     }
 296
 297     if (tv->serverHost[0] && tv->serverHost[0]->cell) {
 298         fsport = tv->serverHost[0]->cell->fsport;
 299     } else {
 300         VNOSERVERS++;
 301     }
 302
 303     /* First is always lowest rank, if it's up */
 304     if ((tv->status[0] == not_busy) && tv->serverHost[0]
 305         && tv->serverHost[0]->addr
 306         && !(tv->serverHost[0]->addr->sa_flags & SRVR_ISDOWN) &&
 307         !(((areq->idleError > 0) || (areq->tokenError > 0))
 308           && (areq->skipserver[0] == 1)))
 309         lowp = tv->serverHost[0]->addr;
 310
 311     /* Otherwise we look at all of them. There are seven levels of
 312      * not_busy. This means we will check a volume seven times before it
 313      * is marked offline. Ideally, we only need two levels, but this
 314      * serves a second purpose of waiting some number of seconds before
 315      * the client decides the volume is offline (ie: a clone could finish
 316      * in this time).
 317      */
 318     for (notbusy = not_busy; (!lowp && (notbusy <= end_not_busy)); notbusy++) {
 319         for (i = 0; i < AFS_MAXHOSTS && tv->serverHost[i]; i++) {
 320             if (tv->states & VRO)
 321                 replicated++;
 322             if (((areq->tokenError > 0)||(areq->idleError > 0))
 323                 && (areq->skipserver[i] == 1))
 324                 continue;
 325             if (tv->status[i] != notbusy) {
 326                 if (tv->status[i] == rd_busy || tv->status[i] == rdwr_busy) {
 327                     if (!areq->busyCount)
 328                         areq->busyCount++;
 329                 } else if (tv->status[i] == offline) {
 330                     if (!areq->volumeError)
 331                         areq->volumeError = VOLMISSING;
 332                 }
 333                 continue;
 334             }
 335             for (sa1p = tv->serverHost[i]->addr; sa1p; sa1p = sa1p->next_sa) {
 336                 if (sa1p->sa_flags & SRVR_ISDOWN)
 337                     continue;
 338                 if (!lowp || (lowp->sa_iprank > sa1p->sa_iprank))
 339                     lowp = sa1p;
 340             }
 341         }
 342     }
 343     if ((replicated == -1) && (tv->states & VRO)) {
 344         for (i = 0; i < AFS_MAXHOSTS && tv->serverHost[i]; i++) {
 345             if (tv->states & VRO)
 346                 replicated++;
 347         }
 348     } else
 349         replicated = 0;
 350
 351     afs_PutVolume(tv, READ_LOCK);
 352
 353     if (lowp) {
 354         tu = afs_GetUser(areq->uid, afid->Cell, SHARED_LOCK);
 355         tconn = afs_ConnBySA(lowp, fsport, afid->Cell, tu, 0 /*!force */ ,
 356                              1 /*create */ , locktype, replicated, rxconn);
 357
 358         afs_PutUser(tu, SHARED_LOCK);
 359     }
 360
 361     return tconn;
 362 }                               /*afs_Conn */
 363
 364
 365 /**
 366  * Connects to a server by it's server address.
 367  *
 368  * @param sap Server address.
 369  * @param aport Server port.
 370  * @param acell
 371  * @param tu Connect as this user.
 372  * @param force_if_down
 373  * @param create
 374  * @param replicated
 375  * @param locktype Specifies type of lock to be used for this function.
 376  *
 377  * @return The new connection.
 378  */
 379 struct afs_conn *
 380 afs_ConnBySA(struct srvAddr *sap, unsigned short aport, afs_int32 acell,
 381              struct unixuser *tu, int force_if_down, afs_int32 create,
 382              afs_int32 locktype, afs_int32 replicated,
 383              struct rx_connection **rxconn)
 384 {
 385     int glocked, foundvec;
 386     struct afs_conn *tc = NULL;
 387     struct sa_conn_vector *tcv = NULL;
 388     struct rx_securityClass *csec; /*Security class object */
 389     int isec; /*Security index */
 390     int service;
 391     int isrep = (replicated > 0)?CONN_REPLICATED:0;
 392
 393     *rxconn = NULL;
 394
 395     if (!sap || ((sap->sa_flags & SRVR_ISDOWN) && !force_if_down)) {
 396         /* sa is known down, and we don't want to force it.  */
 397         return NULL;
 398     }
 399
 400     /* find cached connection */
 401     ObtainSharedLock(&afs_xconn, 15);
 402     foundvec = 0;
 403     for (tcv = sap->conns; tcv; tcv = tcv->next) {
 404         if (tcv->user == tu && tcv->port == aport &&
 405             (isrep == (tcv->flags & CONN_REPLICATED))) {
 406             /* return most eligible conn */
 407             if (!foundvec)
 408                 foundvec = 1;
 409             UpgradeSToWLock(&afs_xconn, 37);
 410             tc = find_preferred_connection(tcv, create);
 411             ConvertWToSLock(&afs_xconn);
 412             break;
 413         }
 414     }
 415
 416     if (!tc && !create) {
 417         /* Not found and can't create a new one. */
 418         ReleaseSharedLock(&afs_xconn);
 419         return NULL;
 420     }
 421
 422     if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
 423         afs_warnuser("afs_ConnBySA: disconnected\n");
 424         ReleaseSharedLock(&afs_xconn);
 425         return NULL;
 426     }
 427
 428     if (!foundvec && create) {
 429         /* No such connection vector exists.  Create one and splice it in.
 430          * Make sure the server record has been marked as used (for the purposes
 431          * of calculating up & down times, it's now considered to be an
 432          * ``active'' server).  Also make sure the server's lastUpdateEvalTime
 433          * gets set, marking the time of its ``birth''.
 434          */
 435         UpgradeSToWLock(&afs_xconn, 37);
 436         new_conn_vector(tcv);
 437
 438         tcv->user = tu;
 439         tcv->port = aport;
 440         tcv->srvr = sap;
 441         tcv->next = sap->conns;
 442         if (isrep)
 443             tcv->flags |= CONN_REPLICATED;
 444         sap->conns = tcv;
 445
 446         /* all struct afs_conn ptrs come from here */
 447         tc = find_preferred_connection(tcv, create);
 448
 449         afs_ActivateServer(sap);
 450
 451         ConvertWToSLock(&afs_xconn);
 452     } /* end of if (!tcv) */
 453
 454     if (!tc) {
 455         /* Not found and no alternatives. */
 456         ReleaseSharedLock(&afs_xconn);
 457         return NULL;
 458     }
 459
 460     if (tc->refCount > 10000) {
 461         static int warned;
 462         if (!warned) {
 463             warned = 1;
 464             afs_warn("afs: Very high afs_conn refCount detected (conn %p, count %d)\n",
 465                      tc, (int)tc->refCount);
 466             afs_warn("afs: Trying to continue, but this may indicate an issue\n");
 467             afs_warn("afs: that may eventually crash the machine. Please file\n");
 468             afs_warn("afs: a bug report.\n");
 469         }
 470     }
 471
 472     if (tu->states & UTokensBad) {
 473         /* we may still have an authenticated RPC connection here,
 474          * we'll have to create a new, unauthenticated, connection.
 475          * Perhaps a better way to do this would be to set
 476          * conn->forceConnectFS on all conns when the token first goes
 477          * bad, but that's somewhat trickier, due to locking
 478          * constraints (though not impossible).
 479          */
 480         if (tc->id && (rx_SecurityClassOf(tc->id) != RX_SECIDX_NULL)) {
 481             tc->forceConnectFS = 1;     /* force recreation of connection */
 482         }
 483         tu->states &= ~UHasTokens;      /* remove the authentication info */
 484     }
 485
 486     glocked = ISAFS_GLOCK();
 487     if (tc->forceConnectFS) {
 488         UpgradeSToWLock(&afs_xconn, 38);
 489         if (tc->id) {
 490             if (sap->natping == tc)
 491                 sap->natping = NULL;
 492             if (glocked)
 493                 AFS_GUNLOCK();
 494             rx_SetConnSecondsUntilNatPing(tc->id, 0);
 495             rx_DestroyConnection(tc->id);
 496             if (glocked)
 497                 AFS_GLOCK();
 498         }
 499         /*
 500          * Stupid hack to determine if using vldb service or file system
 501          * service.
 502          */
 503         if (aport == sap->server->cell->vlport)
 504             service = 52;
 505         else
 506             service = 1;
 507         isec = 0;
 508
 509         csec = afs_pickSecurityObject(tc, &isec);
 510
 511         if (glocked)
 512             AFS_GUNLOCK();
 513         tc->id = rx_NewConnection(sap->sa_ip, aport, service, csec, isec);
 514         if (glocked)
 515             AFS_GLOCK();
 516         if (service == 52) {
 517             rx_SetConnHardDeadTime(tc->id, afs_rx_harddead);
 518         }
 519
 520         /* Setting idle dead time to non-zero activates idle-dead
 521          * RX_CALL_TIMEOUT errors. */
 522         if (isrep)
 523             rx_SetConnIdleDeadTime(tc->id, afs_rx_idledead_rep);
 524         else
 525             rx_SetConnIdleDeadTime(tc->id, afs_rx_idledead);
 526
 527         /*
 528          * Only do this for one connection
 529          */
 530         if ((service != 52) && (sap->natping == NULL)) {
 531             sap->natping = tc;
 532             rx_SetConnSecondsUntilNatPing(tc->id, 20);
 533         }
 534
 535         tc->forceConnectFS = 0; /* apparently we're appropriately connected now */
 536         if (csec)
 537             rxs_Release(csec);
 538         ConvertWToSLock(&afs_xconn);
 539     } /* end of if (tc->forceConnectFS)*/
 540
 541     *rxconn = tc->id;
 542     rx_GetConnection(*rxconn);
 543
 544     ReleaseSharedLock(&afs_xconn);
 545     return tc;
 546 }
 547
 548 /**
 549  * forceConnectFS is set whenever we must recompute the connection. UTokensBad
 550  * is true only if we know that the tokens are bad.  We thus clear this flag
 551  * when we get a new set of tokens..
 552  * Having force... true and UTokensBad true simultaneously means that the tokens
 553  * went bad and we're supposed to create a new, unauthenticated, connection.
 554  *
 555  * @param aserver Server to connect to.
 556  * @param aport Connection port.
 557  * @param acell The cell where all of this happens.
 558  * @param areq The request.
 559  * @param aforce Force connection?
 560  * @param locktype Type of lock to be used.
 561  * @param replicated
 562  *
 563  * @return The established connection.
 564  */
 565 struct afs_conn *
 566 afs_ConnByHost(struct server *aserver, unsigned short aport, afs_int32 acell,
 567                struct vrequest *areq, int aforce, afs_int32 locktype,
 568                afs_int32 replicated, struct rx_connection **rxconn)
 569 {
 570     struct unixuser *tu;
 571     struct afs_conn *tc = NULL;
 572     struct srvAddr *sa = NULL;
 573
 574     *rxconn = NULL;
 575
 576     AFS_STATCNT(afs_ConnByHost);
 577
 578     if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
 579         afs_warnuser("afs_ConnByHost: disconnected\n");
 580         return NULL;
 581     }
 582
 583 /*
 584   1.  look for an existing connection
 585   2.  create a connection at an address believed to be up
 586       (if aforce is true, create a connection at the first address)
 587 */
 588
 589     tu = afs_GetUser(areq->uid, acell, SHARED_LOCK);
 590
 591     for (sa = aserver->addr; sa; sa = sa->next_sa) {
 592         tc = afs_ConnBySA(sa, aport, acell, tu, aforce,
 593                           0 /*don't create one */ ,
 594                           locktype, replicated, rxconn);
 595         if (tc)
 596             break;
 597     }
 598
 599     if (!tc) {
 600         for (sa = aserver->addr; sa; sa = sa->next_sa) {
 601             tc = afs_ConnBySA(sa, aport, acell, tu, aforce,
 602                               1 /*create one */ ,
 603                               locktype, replicated, rxconn);
 604             if (tc)
 605                 break;
 606         }
 607     }
 608
 609     afs_PutUser(tu, SHARED_LOCK);
 610     return tc;
 611
 612 }                               /*afs_ConnByHost */
 613
 614
 615 /**
 616  * Connect by multiple hosts.
 617  * Try to connect to one of the hosts from the ahosts array.
 618  *
 619  * @param ahosts Multiple hosts to connect to.
 620  * @param aport Connection port.
 621  * @param acell The cell where all of this happens.
 622  * @param areq The request.
 623  * @param locktype Type of lock to be used.
 624  * @param replicated
 625  *
 626  * @return The established connection or NULL.
 627  */
 628 struct afs_conn *
 629 afs_ConnByMHosts(struct server *ahosts[], unsigned short aport,
 630                  afs_int32 acell, struct vrequest *areq,
 631                  afs_int32 locktype, afs_int32 replicated,
 632                  struct rx_connection **rxconn)
 633 {
 634     afs_int32 i;
 635     struct afs_conn *tconn;
 636     struct server *ts;
 637
 638     *rxconn = NULL;
 639
 640     /* try to find any connection from the set */
 641     AFS_STATCNT(afs_ConnByMHosts);
 642     for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
 643         if ((ts = ahosts[i]) == NULL)
 644             break;
 645         tconn = afs_ConnByHost(ts, aport, acell, areq, 0, locktype,
 646                                replicated, rxconn);
 647         if (tconn) {
 648             return tconn;
 649         }
 650     }
 651     return NULL;
 652
 653 }                               /*afs_ConnByMHosts */
 654
 655
 656 /**
 657  * Decrement reference count to this connection.
 658  * @param ac
 659  * @param locktype
 660  */
 661 void
 662 afs_PutConn(struct afs_conn *ac, struct rx_connection *rxconn,
 663             afs_int32 locktype)
 664 {
 665     AFS_STATCNT(afs_PutConn);
 666     ac->refCount--;
 667     if (ac->refCount < 0) {
 668         osi_Panic("afs_PutConn: refcount imbalance 0x%lx %d",
 669                   (unsigned long)(uintptrsz)ac, (int)ac->refCount);
 670     }
 671     ac->parent->refCount--;
 672     rx_PutConnection(rxconn);
 673 }                               /*afs_PutConn */
 674
 675
 676 /**
 677  * Free up a connection vector, allowing, eg, code in afs_user.c
 678  * to ignore how connections are stored/pooled
 679  * @param tcv
 680  */
 681 void
 682 afs_ReleaseConns(struct sa_conn_vector *tcv) {
 683     release_conns_vector(tcv);
 684 }
 685
 686
 687 /**
 688  * Free connection vector(s) for a user
 689  * @param au
 690  */
 691 void
 692 afs_ReleaseConnsUser(struct unixuser *au) {
 693
 694     int i;
 695     struct server *ts;
 696
 697     for (i = 0; i < NSERVERS; i++) {
 698         for (ts = afs_servers[i]; ts; ts = ts->next) {
 699             release_conns_user_server(au, ts);
 700         }       /*For each server on chain */
 701     } /*For each chain */
 702 }
 703
 704
 705 /**
 706  * For multi homed clients, a RPC may timeout because of a
 707  * client network interface going down. We need to reopen new
 708  * connections in this case.
 709  *
 710  * @param sap Server address.
 711  */
 712 void
 713 ForceNewConnections(struct srvAddr *sap)
 714 {
 715     int cix;
 716     struct afs_conn *tc = NULL;
 717     struct sa_conn_vector *tcv = NULL;
 718
 719     if (!sap)
 720         return; /* defensive check */
 721
 722     ObtainWriteLock(&afs_xconn, 413);
 723     for (tcv = sap->conns; tcv; tcv = tcv->next) {
 724         for(cix = 0; cix < CVEC_LEN; ++cix) {
 725             tc = &(tcv->cvec[cix]);
 726             if (tc->activated)
 727                 tc->forceConnectFS = 1;
 728         }
 729     }
 730     ReleaseWriteLock(&afs_xconn);
 731 }
 732
 733