src/WINNT/afsd/cm_server.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 #include <afs/param.h>
  11 #include <afs/stds.h>
  12
  13 #include <windows.h>
  14 #include <winsock2.h>
  15 #include <nb30.h>
  16 #include <stdlib.h>
  17 #include <malloc.h>
  18 #include <string.h>
  19
  20 #include "afsd.h"
  21 #include <WINNT\syscfg.h>
  22 #include <osi.h>
  23 #include <rx/rx.h>
  24
  25 osi_rwlock_t cm_serverLock;
  26
  27 cm_server_t *cm_allServersp;
  28 afs_uint32   cm_numFileServers = 0;
  29 afs_uint32   cm_numVldbServers = 0;
  30
  31 void
  32 cm_ForceNewConnectionsAllServers(void)
  33 {
  34     cm_server_t *tsp;
  35
  36     lock_ObtainWrite(&cm_serverLock);
  37     for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
  38         cm_GetServerNoLock(tsp);
  39         cm_ForceNewConnections(tsp);
  40         cm_PutServerNoLock(tsp);
  41     }
  42     lock_ReleaseWrite(&cm_serverLock);
  43 }
  44
  45 void
  46 cm_PingServer(cm_server_t *tsp)
  47 {
  48     long code;
  49     int wasDown = 0;
  50     cm_conn_t *connp;
  51     struct rx_connection * rxconnp;
  52     long secs;
  53     long usecs;
  54     Capabilities caps = {0, 0};
  55     char hoststr[16];
  56     cm_req_t req;
  57
  58     lock_ObtainMutex(&tsp->mx);
  59     if (tsp->flags & CM_SERVERFLAG_PINGING) {
  60         tsp->waitCount++;
  61         osi_SleepM((LONG_PTR)tsp, &tsp->mx);
  62         lock_ObtainMutex(&tsp->mx);
  63         tsp->waitCount--;
  64         if (tsp->waitCount == 0)
  65             tsp->flags &= ~CM_SERVERFLAG_PINGING;
  66         else
  67             osi_Wakeup((LONG_PTR)tsp);
  68         lock_ReleaseMutex(&tsp->mx);
  69         return;
  70     }
  71     tsp->flags |= CM_SERVERFLAG_PINGING;
  72     wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
  73     afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
  74     lock_ReleaseMutex(&tsp->mx);
  75
  76     code = cm_ConnByServer(tsp, cm_rootUserp, &connp);
  77     if (code == 0) {
  78         /* now call the appropriate ping call.  Drop the timeout if
  79         * the server is known to be down, so that we don't waste a
  80         * lot of time retiming out down servers.
  81         */
  82
  83         osi_Log4(afsd_logp, "cm_PingServer server %s (%s) was %s with caps 0x%x",
  84                   osi_LogSaveString(afsd_logp, hoststr),
  85                   tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
  86                   wasDown ? "down" : "up",
  87                   tsp->capabilities);
  88
  89         rxconnp = cm_GetRxConn(connp);
  90         if (wasDown)
  91             rx_SetConnDeadTime(rxconnp, 10);
  92         if (tsp->type == CM_SERVER_VLDB) {
  93             code = VL_ProbeServer(rxconnp);
  94         }
  95         else {
  96             /* file server */
  97             code = RXAFS_GetCapabilities(rxconnp, &caps);
  98             if (code == RXGEN_OPCODE)
  99                 code = RXAFS_GetTime(rxconnp, &secs, &usecs);
 100         }
 101         if (wasDown)
 102             rx_SetConnDeadTime(rxconnp, ConnDeadtimeout);
 103         rx_PutConnection(rxconnp);
 104         cm_PutConn(connp);
 105     }   /* got an unauthenticated connection to this server */
 106
 107     lock_ObtainMutex(&tsp->mx);
 108     if (code >= 0) {
 109         /* mark server as up */
 110         tsp->flags &= ~CM_SERVERFLAG_DOWN;
 111         tsp->downTime = 0;
 112
 113         /* we currently handle 32-bits of capabilities */
 114         if (caps.Capabilities_len > 0) {
 115             tsp->capabilities = caps.Capabilities_val[0];
 116             free(caps.Capabilities_val);
 117             caps.Capabilities_len = 0;
 118             caps.Capabilities_val = 0;
 119         } else {
 120             tsp->capabilities = 0;
 121         }
 122
 123         osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is up with caps 0x%x",
 124                   osi_LogSaveString(afsd_logp, hoststr),
 125                   tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 126                   tsp->capabilities);
 127
 128         /* Now update the volume status if necessary */
 129         if (wasDown) {
 130             cm_server_vols_t * tsrvp;
 131             cm_volume_t * volp;
 132             int i;
 133
 134             for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 135                 for (i=0; i<NUM_SERVER_VOLS; i++) {
 136                     if (tsrvp->ids[i] != 0) {
 137                         cm_InitReq(&req);
 138
 139                         lock_ReleaseMutex(&tsp->mx);
 140                         code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 141                                                 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 142                         lock_ObtainMutex(&tsp->mx);
 143                         if (code == 0) {
 144                             cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 145                             cm_PutVolume(volp);
 146                         }
 147                     }
 148                 }
 149             }
 150         }
 151     } else {
 152         /* mark server as down */
 153         if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
 154             tsp->flags |= CM_SERVERFLAG_DOWN;
 155             tsp->downTime = time(NULL);
 156         }
 157         if (code != VRESTARTING)
 158             cm_ForceNewConnections(tsp);
 159
 160         osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is down with caps 0x%x",
 161                   osi_LogSaveString(afsd_logp, hoststr),
 162                   tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 163                   tsp->capabilities);
 164
 165         /* Now update the volume status if necessary */
 166         if (!wasDown) {
 167             cm_server_vols_t * tsrvp;
 168             cm_volume_t * volp;
 169             int i;
 170
 171             for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 172                 for (i=0; i<NUM_SERVER_VOLS; i++) {
 173                     if (tsrvp->ids[i] != 0) {
 174                         cm_InitReq(&req);
 175
 176                         lock_ReleaseMutex(&tsp->mx);
 177                         code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 178                                                 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 179                         lock_ObtainMutex(&tsp->mx);
 180                         if (code == 0) {
 181                             cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 182                             cm_PutVolume(volp);
 183                         }
 184                     }
 185                 }
 186             }
 187         }
 188     }
 189
 190     if (tsp->waitCount == 0)
 191         tsp->flags &= ~CM_SERVERFLAG_PINGING;
 192     else
 193         osi_Wakeup((LONG_PTR)tsp);
 194     lock_ReleaseMutex(&tsp->mx);
 195 }
 196
 197 #define MULTI_CHECKSERVERS 1
 198 #ifndef MULTI_CHECKSERVERS
 199 void cm_CheckServers(afs_uint32 flags, cm_cell_t *cellp)
 200 {
 201     /* ping all file servers, up or down, with unauthenticated connection,
 202      * to find out whether we have all our callbacks from the server still.
 203      * Also, ping down VLDBs.
 204      */
 205     cm_server_t *tsp;
 206     int doPing;
 207     int isDown;
 208     int isFS;
 209
 210     lock_ObtainWrite(&cm_serverLock);
 211     for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
 212         cm_GetServerNoLock(tsp);
 213         lock_ReleaseWrite(&cm_serverLock);
 214
 215         /* now process the server */
 216         lock_ObtainMutex(&tsp->mx);
 217
 218         doPing = 0;
 219         isDown = tsp->flags & CM_SERVERFLAG_DOWN;
 220         isFS   = tsp->type == CM_SERVER_FILE;
 221
 222         /* only do the ping if the cell matches the requested cell, or we're
 223          * matching all cells (cellp == NULL), and if we've requested to ping
 224          * this type of {up, down} servers.
 225          */
 226         if ((cellp == NULL || cellp == tsp->cellp) &&
 227              ((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
 228                (!isDown && (flags & CM_FLAG_CHECKUPSERVERS))) &&
 229              ((!(flags & CM_FLAG_CHECKVLDBSERVERS) ||
 230                !isFS && (flags & CM_FLAG_CHECKVLDBSERVERS)) &&
 231               (!(flags & CM_FLAG_CHECKFILESERVERS) ||
 232                  isFS && (flags & CM_FLAG_CHECKFILESERVERS)))) {
 233             doPing = 1;
 234         }       /* we're supposed to check this up/down server */
 235         lock_ReleaseMutex(&tsp->mx);
 236
 237         /* at this point, we've adjusted the server state, so do the ping and
 238          * adjust things.
 239          */
 240         if (doPing)
 241             cm_PingServer(tsp);
 242
 243         /* also, run the GC function for connections on all of the
 244          * server's connections.
 245          */
 246         cm_GCConnections(tsp);
 247
 248         lock_ObtainWrite(&cm_serverLock);
 249         cm_PutServerNoLock(tsp);
 250     }
 251     lock_ReleaseWrite(&cm_serverLock);
 252 }
 253 #else /* MULTI_CHECKSERVERS */
 254 void cm_CheckServers(afs_uint32 flags, cm_cell_t *cellp)
 255 {
 256     /*
 257      * The goal of this function is to probe simultaneously
 258      * probe all of the up/down servers (vldb/file) as
 259      * specified by flags in the minimum number of RPCs.
 260      * Effectively that means use one multi_RXAFS_GetCapabilities()
 261      * followed by possibly one multi_RXAFS_GetTime() and
 262      * one multi_VL_ProbeServer().
 263      *
 264      * To make this work we must construct the list of vldb
 265      * and file servers that are to be probed as well as the
 266      * associated data structures.
 267      */
 268
 269     int srvAddrCount = 0;
 270     struct srvAddr **addrs = NULL;
 271     cm_conn_t **conns = NULL;
 272     struct rx_connection **rxconns = NULL;
 273     cm_req_t req;
 274     afs_int32 i, j, nconns = 0;
 275     afs_int32 *conntimer, *results;
 276     Capabilities *caps = NULL;
 277     cm_server_t ** serversp, *tsp;
 278     afs_uint32 isDown, wasDown;
 279     afs_uint32 code;
 280     time_t start, end, *deltas;
 281     afs_int32 secs;
 282     afs_int32 usecs;
 283     char hoststr[16];
 284
 285     cm_InitReq(&req);
 286
 287     j = max(cm_numFileServers,cm_numVldbServers);
 288     conns = (cm_conn_t **)malloc(j * sizeof(cm_conn_t *));
 289     rxconns = (struct rx_connection **)malloc(j * sizeof(struct rx_connection *));
 290     conntimer = (afs_int32 *)malloc(j * sizeof (afs_int32));
 291     deltas = (time_t *)malloc(j * sizeof (time_t));
 292     results = (afs_int32 *)malloc(j * sizeof (afs_int32));
 293     serversp = (cm_server_t **)malloc(j * sizeof(cm_server_t *));
 294     caps = (Capabilities *)malloc(j * sizeof(Capabilities));
 295
 296     memset(caps, 0, j * sizeof(Capabilities));
 297
 298     if ((flags & CM_FLAG_CHECKFILESERVERS) ||
 299         !(flags & (CM_FLAG_CHECKFILESERVERS|CM_FLAG_CHECKVLDBSERVERS)))
 300     {
 301         lock_ObtainWrite(&cm_serverLock);
 302         nconns = 0;
 303         for (nconns=0, tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
 304             if (tsp->type != CM_SERVER_FILE ||
 305                 tsp->cellp == NULL ||           /* SetPref only */
 306                 cellp && cellp != tsp->cellp)
 307                 continue;
 308
 309             cm_GetServerNoLock(tsp);
 310             lock_ReleaseWrite(&cm_serverLock);
 311
 312             lock_ObtainMutex(&tsp->mx);
 313             isDown = tsp->flags & CM_SERVERFLAG_DOWN;
 314
 315             if ((tsp->flags & CM_SERVERFLAG_PINGING) ||
 316                 !((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
 317                    (!isDown && (flags & CM_FLAG_CHECKUPSERVERS)))) {
 318                 lock_ReleaseMutex(&tsp->mx);
 319                 lock_ObtainWrite(&cm_serverLock);
 320                 continue;
 321             }
 322
 323             tsp->flags |= CM_SERVERFLAG_PINGING;
 324             lock_ReleaseMutex(&tsp->mx);
 325
 326             serversp[nconns] = tsp;
 327             code = cm_ConnByServer(tsp, cm_rootUserp, &conns[nconns]);
 328             if (code) {
 329                     lock_ObtainWrite(&cm_serverLock);
 330                 cm_PutServerNoLock(tsp);
 331                 continue;
 332             }
 333             lock_ObtainWrite(&cm_serverLock);
 334                         rxconns[nconns] = cm_GetRxConn(conns[nconns]);
 335             if (conntimer[nconns] = (isDown ? 1 : 0))
 336                 rx_SetConnDeadTime(rxconns[nconns], 10);
 337
 338             nconns++;
 339         }
 340         lock_ReleaseWrite(&cm_serverLock);
 341
 342         if (nconns) {
 343             /* Perform the multi call */
 344             start = time(NULL);
 345             multi_Rx(rxconns,nconns)
 346             {
 347                 multi_RXAFS_GetCapabilities(&caps[multi_i]);
 348                 results[multi_i]=multi_error;
 349             } multi_End;
 350         }
 351
 352         /* Process results of servers that support RXAFS_GetCapabilities */
 353         for (i=0; i<nconns; i++) {
 354             /* Leave the servers that did not support GetCapabilities alone */
 355             if (results[i] == RXGEN_OPCODE)
 356                 continue;
 357
 358             if (conntimer[i])
 359                 rx_SetConnDeadTime(rxconns[i], ConnDeadtimeout);
 360             rx_PutConnection(rxconns[i]);
 361             cm_PutConn(conns[i]);
 362
 363             tsp = serversp[i];
 364             cm_GCConnections(tsp);
 365
 366             lock_ObtainMutex(&tsp->mx);
 367             wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
 368
 369             if (results[i] >= 0)  {
 370                 /* mark server as up */
 371                 tsp->flags &= ~CM_SERVERFLAG_DOWN;
 372                 tsp->downTime = 0;
 373
 374                 /* we currently handle 32-bits of capabilities */
 375                 if (caps[i].Capabilities_len > 0) {
 376                     tsp->capabilities = caps[i].Capabilities_val[0];
 377                     free(caps[i].Capabilities_val);
 378                     caps[i].Capabilities_len = 0;
 379                     caps[i].Capabilities_val = 0;
 380                 } else {
 381                     tsp->capabilities = 0;
 382                 }
 383
 384                 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
 385                 osi_Log3(afsd_logp, "cm_MultiPingServer server %s (%s) is up with caps 0x%x",
 386                           osi_LogSaveString(afsd_logp, hoststr),
 387                           tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 388                           tsp->capabilities);
 389
 390                 /* Now update the volume status if necessary */
 391                 if (wasDown) {
 392                     cm_server_vols_t * tsrvp;
 393                     cm_volume_t * volp;
 394                     int i;
 395
 396                     for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 397                         for (i=0; i<NUM_SERVER_VOLS; i++) {
 398                             if (tsrvp->ids[i] != 0) {
 399                                 cm_InitReq(&req);
 400
 401                                 lock_ReleaseMutex(&tsp->mx);
 402                                 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 403                                                          &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 404                                 lock_ObtainMutex(&tsp->mx);
 405                                 if (code == 0) {
 406                                     cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 407                                     cm_PutVolume(volp);
 408                                 }
 409                             }
 410                         }
 411                     }
 412                 }
 413             } else {
 414                 /* mark server as down */
 415                 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
 416                     tsp->flags |= CM_SERVERFLAG_DOWN;
 417                     tsp->downTime = time(NULL);
 418                 }
 419                 if (code != VRESTARTING)
 420                     cm_ForceNewConnections(tsp);
 421
 422                 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
 423                 osi_Log3(afsd_logp, "cm_MultiPingServer server %s (%s) is down with caps 0x%x",
 424                           osi_LogSaveString(afsd_logp, hoststr),
 425                           tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 426                           tsp->capabilities);
 427
 428                 /* Now update the volume status if necessary */
 429                 if (!wasDown) {
 430                     cm_server_vols_t * tsrvp;
 431                     cm_volume_t * volp;
 432                     int i;
 433
 434                     for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 435                         for (i=0; i<NUM_SERVER_VOLS; i++) {
 436                             if (tsrvp->ids[i] != 0) {
 437                                 cm_InitReq(&req);
 438
 439                                 lock_ReleaseMutex(&tsp->mx);
 440                                 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 441                                                          &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 442                                 lock_ObtainMutex(&tsp->mx);
 443                                 if (code == 0) {
 444                                     cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 445                                     cm_PutVolume(volp);
 446                                 }
 447                             }
 448                         }
 449                     }
 450                 }
 451             }
 452
 453             if (tsp->waitCount == 0)
 454                 tsp->flags &= ~CM_SERVERFLAG_PINGING;
 455             else
 456                 osi_Wakeup((LONG_PTR)tsp);
 457
 458             lock_ReleaseMutex(&tsp->mx);
 459
 460             cm_PutServer(tsp);
 461         }
 462
 463         /*
 464          * At this point we have handled any responses that did not indicate
 465          * that RXAFS_GetCapabilities is not supported.
 466          */
 467         for ( i=0, j=0; i<nconns; i++) {
 468             if (results[i] == RXGEN_OPCODE) {
 469                 if (i != j) {
 470                     conns[j] = conns[i];
 471                     rxconns[j] = rxconns[i];
 472                     serversp[j] = serversp[i];
 473                 }
 474                 j++;
 475             }
 476         }
 477         nconns = j;
 478
 479         if (nconns) {
 480             /* Perform the multi call */
 481             start = time(NULL);
 482             multi_Rx(rxconns,nconns)
 483             {
 484                 secs = usecs = 0;
 485                 multi_RXAFS_GetTime(&secs, &usecs);
 486                 end = time(NULL);
 487                 results[multi_i]=multi_error;
 488                 if ((start == end) && !multi_error)
 489                     deltas[multi_i] = end - secs;
 490             } multi_End;
 491         }
 492
 493         /* Process Results of servers that only support RXAFS_GetTime */
 494         for (i=0; i<nconns; i++) {
 495             /* Leave the servers that did not support GetCapabilities alone */
 496             if (conntimer[i])
 497                 rx_SetConnDeadTime(rxconns[i], ConnDeadtimeout);
 498             rx_PutConnection(rxconns[i]);
 499             cm_PutConn(conns[i]);
 500
 501             tsp = serversp[i];
 502             cm_GCConnections(tsp);
 503
 504             lock_ObtainMutex(&tsp->mx);
 505             wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
 506
 507             if (results[i] >= 0)  {
 508                 /* mark server as up */
 509                 tsp->flags &= ~CM_SERVERFLAG_DOWN;
 510                 tsp->downTime = 0;
 511                 tsp->capabilities = 0;
 512
 513                 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
 514                 osi_Log3(afsd_logp, "cm_MultiPingServer server %s (%s) is up with caps 0x%x",
 515                           osi_LogSaveString(afsd_logp, hoststr),
 516                           tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 517                           tsp->capabilities);
 518
 519                 /* Now update the volume status if necessary */
 520                 if (wasDown) {
 521                     cm_server_vols_t * tsrvp;
 522                     cm_volume_t * volp;
 523                     int i;
 524
 525                     for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 526                         for (i=0; i<NUM_SERVER_VOLS; i++) {
 527                             if (tsrvp->ids[i] != 0) {
 528                                 cm_InitReq(&req);
 529
 530                                 lock_ReleaseMutex(&tsp->mx);
 531                                 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 532                                                          &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 533                                 lock_ObtainMutex(&tsp->mx);
 534                                 if (code == 0) {
 535                                     cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 536                                     cm_PutVolume(volp);
 537                                 }
 538                             }
 539                         }
 540                     }
 541                 }
 542             } else {
 543                 /* mark server as down */
 544                 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
 545                     tsp->flags |= CM_SERVERFLAG_DOWN;
 546                     tsp->downTime = time(NULL);
 547                 }
 548                 if (code != VRESTARTING)
 549                     cm_ForceNewConnections(tsp);
 550
 551                 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
 552                 osi_Log3(afsd_logp, "cm_MultiPingServer server %s (%s) is down with caps 0x%x",
 553                           osi_LogSaveString(afsd_logp, hoststr),
 554                           tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 555                           tsp->capabilities);
 556
 557                 /* Now update the volume status if necessary */
 558                 if (!wasDown) {
 559                     cm_server_vols_t * tsrvp;
 560                     cm_volume_t * volp;
 561                     int i;
 562
 563                     for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 564                         for (i=0; i<NUM_SERVER_VOLS; i++) {
 565                             if (tsrvp->ids[i] != 0) {
 566                                 cm_InitReq(&req);
 567
 568                                 lock_ReleaseMutex(&tsp->mx);
 569                                 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 570                                                          &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 571                                 lock_ObtainMutex(&tsp->mx);
 572                                 if (code == 0) {
 573                                     cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 574                                     cm_PutVolume(volp);
 575                                 }
 576                             }
 577                         }
 578                     }
 579                 }
 580             }
 581
 582             if (tsp->waitCount == 0)
 583                 tsp->flags &= ~CM_SERVERFLAG_PINGING;
 584             else
 585                 osi_Wakeup((LONG_PTR)tsp);
 586
 587             lock_ReleaseMutex(&tsp->mx);
 588
 589             cm_PutServer(tsp);
 590         }
 591     }
 592
 593     if ((flags & CM_FLAG_CHECKVLDBSERVERS) ||
 594         !(flags & (CM_FLAG_CHECKFILESERVERS|CM_FLAG_CHECKVLDBSERVERS)))
 595     {
 596         lock_ObtainWrite(&cm_serverLock);
 597         nconns = 0;
 598         for (nconns=0, tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
 599             if (tsp->type != CM_SERVER_VLDB ||
 600                 tsp->cellp == NULL ||           /* SetPref only */
 601                 cellp && cellp != tsp->cellp)
 602                 continue;
 603
 604             cm_GetServerNoLock(tsp);
 605             lock_ReleaseWrite(&cm_serverLock);
 606
 607             lock_ObtainMutex(&tsp->mx);
 608             isDown = tsp->flags & CM_SERVERFLAG_DOWN;
 609
 610             if ((tsp->flags & CM_SERVERFLAG_PINGING) ||
 611                 !((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
 612                    (!isDown && (flags & CM_FLAG_CHECKUPSERVERS)))) {
 613                 lock_ReleaseMutex(&tsp->mx);
 614                 lock_ObtainWrite(&cm_serverLock);
 615                 continue;
 616             }
 617
 618             tsp->flags |= CM_SERVERFLAG_PINGING;
 619             lock_ReleaseMutex(&tsp->mx);
 620
 621             serversp[nconns] = tsp;
 622             code = cm_ConnByServer(tsp, cm_rootUserp, &conns[nconns]);
 623             if (code) {
 624                     lock_ObtainWrite(&cm_serverLock);
 625                 cm_PutServerNoLock(tsp);
 626                 continue;
 627             }
 628             lock_ObtainWrite(&cm_serverLock);
 629             rxconns[nconns] = cm_GetRxConn(conns[nconns]);
 630             conntimer[nconns] = (isDown ? 1 : 0);
 631             if (isDown)
 632                 rx_SetConnDeadTime(rxconns[nconns], 10);
 633
 634             nconns++;
 635         }
 636         lock_ReleaseWrite(&cm_serverLock);
 637
 638         if (nconns) {
 639             /* Perform the multi call */
 640             start = time(NULL);
 641             multi_Rx(rxconns,nconns)
 642             {
 643                 multi_VL_ProbeServer();
 644                 results[multi_i]=multi_error;
 645             } multi_End;
 646         }
 647
 648         /* Process results of servers that support RXAFS_GetCapabilities */
 649         for (i=0; i<nconns; i++) {
 650             if (conntimer[i])
 651                 rx_SetConnDeadTime(rxconns[i], ConnDeadtimeout);
 652             rx_PutConnection(rxconns[i]);
 653             cm_PutConn(conns[i]);
 654
 655             tsp = serversp[i];
 656             cm_GCConnections(tsp);
 657
 658             lock_ObtainMutex(&tsp->mx);
 659             wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
 660
 661             if (results[i] >= 0)  {
 662                 /* mark server as up */
 663                 tsp->flags &= ~CM_SERVERFLAG_DOWN;
 664                 tsp->downTime = 0;
 665                 tsp->capabilities = 0;
 666
 667                 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
 668                 osi_Log3(afsd_logp, "cm_MultiPingServer server %s (%s) is up with caps 0x%x",
 669                           osi_LogSaveString(afsd_logp, hoststr),
 670                           tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 671                           tsp->capabilities);
 672
 673                 /* Now update the volume status if necessary */
 674                 if (wasDown) {
 675                     cm_server_vols_t * tsrvp;
 676                     cm_volume_t * volp;
 677                     int i;
 678
 679                     for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 680                         for (i=0; i<NUM_SERVER_VOLS; i++) {
 681                             if (tsrvp->ids[i] != 0) {
 682                                 cm_InitReq(&req);
 683
 684                                 lock_ReleaseMutex(&tsp->mx);
 685                                 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 686                                                          &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 687                                 lock_ObtainMutex(&tsp->mx);
 688                                 if (code == 0) {
 689                                     cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 690                                     cm_PutVolume(volp);
 691                                 }
 692                             }
 693                         }
 694                     }
 695                 }
 696             } else {
 697                 /* mark server as down */
 698                 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
 699                     tsp->flags |= CM_SERVERFLAG_DOWN;
 700                     tsp->downTime = time(NULL);
 701                 }
 702                 if (code != VRESTARTING)
 703                     cm_ForceNewConnections(tsp);
 704
 705                 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
 706                 osi_Log3(afsd_logp, "cm_MultiPingServer server %s (%s) is down with caps 0x%x",
 707                           osi_LogSaveString(afsd_logp, hoststr),
 708                           tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
 709                           tsp->capabilities);
 710
 711                 /* Now update the volume status if necessary */
 712                 if (!wasDown) {
 713                     cm_server_vols_t * tsrvp;
 714                     cm_volume_t * volp;
 715                     int i;
 716
 717                     for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
 718                         for (i=0; i<NUM_SERVER_VOLS; i++) {
 719                             if (tsrvp->ids[i] != 0) {
 720                                 cm_InitReq(&req);
 721
 722                                 lock_ReleaseMutex(&tsp->mx);
 723                                 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
 724                                                          &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
 725                                 lock_ObtainMutex(&tsp->mx);
 726                                 if (code == 0) {
 727                                     cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
 728                                     cm_PutVolume(volp);
 729                                 }
 730                             }
 731                         }
 732                     }
 733                 }
 734             }
 735
 736             if (tsp->waitCount == 0)
 737                 tsp->flags &= ~CM_SERVERFLAG_PINGING;
 738             else
 739                 osi_Wakeup((LONG_PTR)tsp);
 740
 741             lock_ReleaseMutex(&tsp->mx);
 742
 743             cm_PutServer(tsp);
 744         }
 745     }
 746
 747     free(conns);
 748     free(rxconns);
 749     free(conntimer);
 750     free(deltas);
 751     free(results);
 752     free(caps);
 753 }
 754 #endif /* MULTI_CHECKSERVERS */
 755
 756 void cm_InitServer(void)
 757 {
 758     static osi_once_t once;
 759
 760     if (osi_Once(&once)) {
 761         lock_InitializeRWLock(&cm_serverLock, "cm_serverLock");
 762         osi_EndOnce(&once);
 763     }
 764 }
 765
 766 void cm_GetServer(cm_server_t *serverp)
 767 {
 768     lock_ObtainWrite(&cm_serverLock);
 769     serverp->refCount++;
 770     lock_ReleaseWrite(&cm_serverLock);
 771 }
 772
 773 void cm_GetServerNoLock(cm_server_t *serverp)
 774 {
 775     serverp->refCount++;
 776 }
 777
 778 void cm_PutServer(cm_server_t *serverp)
 779 {
 780     lock_ObtainWrite(&cm_serverLock);
 781     osi_assertx(serverp->refCount-- > 0, "cm_server_t refCount 0");
 782     lock_ReleaseWrite(&cm_serverLock);
 783 }
 784
 785 void cm_PutServerNoLock(cm_server_t *serverp)
 786 {
 787     osi_assertx(serverp->refCount-- > 0, "cm_server_t refCount 0");
 788 }
 789
 790 void cm_SetServerNo64Bit(cm_server_t * serverp, int no64bit)
 791 {
 792     lock_ObtainMutex(&serverp->mx);
 793     if (no64bit)
 794         serverp->flags |= CM_SERVERFLAG_NO64BIT;
 795     else
 796         serverp->flags &= ~CM_SERVERFLAG_NO64BIT;
 797     lock_ReleaseMutex(&serverp->mx);
 798 }
 799
 800 void cm_SetServerNoInlineBulk(cm_server_t * serverp, int no)
 801 {
 802     lock_ObtainMutex(&serverp->mx);
 803     if (no)
 804         serverp->flags |= CM_SERVERFLAG_NOINLINEBULK;
 805     else
 806         serverp->flags &= ~CM_SERVERFLAG_NOINLINEBULK;
 807     lock_ReleaseMutex(&serverp->mx);
 808 }
 809
 810 void cm_SetServerPrefs(cm_server_t * serverp)
 811 {
 812     unsigned long       serverAddr;     /* in host byte order */
 813     unsigned long       myAddr, myNet, mySubnet;/* in host byte order */
 814     unsigned long       netMask;
 815     int                 i;
 816
 817     int cm_noIPAddr;         /* number of client network interfaces */
 818     int cm_IPAddr[CM_MAXINTERFACE_ADDR];    /* client's IP address in host order */
 819     int cm_SubnetMask[CM_MAXINTERFACE_ADDR];/* client's subnet mask in host order*/
 820     int cm_NetMtu[CM_MAXINTERFACE_ADDR];    /* client's MTU sizes */
 821     int cm_NetFlags[CM_MAXINTERFACE_ADDR];  /* network flags */
 822     long code;
 823
 824     /* get network related info */
 825     cm_noIPAddr = CM_MAXINTERFACE_ADDR;
 826     code = syscfg_GetIFInfo(&cm_noIPAddr,
 827                             cm_IPAddr, cm_SubnetMask,
 828                             cm_NetMtu, cm_NetFlags);
 829
 830     serverAddr = ntohl(serverp->addr.sin_addr.s_addr);
 831     serverp->ipRank  = CM_IPRANK_LOW;   /* default setings */
 832
 833     for ( i=0; i < cm_noIPAddr; i++)
 834     {
 835         /* loop through all the client's IP address and compare
 836         ** each of them against the server's IP address */
 837
 838         myAddr = cm_IPAddr[i];
 839         if ( IN_CLASSA(myAddr) )
 840             netMask = IN_CLASSA_NET;
 841         else if ( IN_CLASSB(myAddr) )
 842             netMask = IN_CLASSB_NET;
 843         else if ( IN_CLASSC(myAddr) )
 844             netMask = IN_CLASSC_NET;
 845         else
 846             netMask = 0;
 847
 848         myNet    =  myAddr & netMask;
 849         mySubnet =  myAddr & cm_SubnetMask[i];
 850
 851         if ( (serverAddr & netMask) == myNet )
 852         {
 853             if ( (serverAddr & cm_SubnetMask[i]) == mySubnet)
 854             {
 855                 if ( serverAddr == myAddr )
 856                     serverp->ipRank = min(serverp->ipRank,
 857                                            CM_IPRANK_TOP);/* same machine */
 858                 else serverp->ipRank = min(serverp->ipRank,
 859                                             CM_IPRANK_HI); /* same subnet */
 860             }
 861             else serverp->ipRank = min(serverp->ipRank,CM_IPRANK_MED);
 862             /* same net */
 863         }
 864         /* random between 0..15*/
 865         serverp->ipRank += min(serverp->ipRank, rand() % 0x000f);
 866     } /* and of for loop */
 867 }
 868
 869 cm_server_t *cm_NewServer(struct sockaddr_in *socketp, int type, cm_cell_t *cellp, afs_uint32 flags) {
 870     cm_server_t *tsp;
 871
 872     osi_assertx(socketp->sin_family == AF_INET, "unexpected socket family");
 873
 874     tsp = malloc(sizeof(*tsp));
 875     if (tsp) {
 876         memset(tsp, 0, sizeof(*tsp));
 877         tsp->type = type;
 878         tsp->cellp = cellp;
 879         tsp->refCount = 1;
 880         lock_InitializeMutex(&tsp->mx, "cm_server_t mutex");
 881         tsp->addr = *socketp;
 882
 883         cm_SetServerPrefs(tsp);
 884
 885         lock_ObtainWrite(&cm_serverLock);       /* get server lock */
 886         tsp->allNextp = cm_allServersp;
 887         cm_allServersp = tsp;
 888
 889         switch (type) {
 890         case CM_SERVER_VLDB:
 891             cm_numVldbServers++;
 892             break;
 893         case CM_SERVER_FILE:
 894             cm_numFileServers++;
 895             break;
 896         }
 897
 898         lock_ReleaseWrite(&cm_serverLock);      /* release server lock */
 899
 900         if ( !(flags & CM_FLAG_NOPROBE) ) {
 901             tsp->flags = CM_SERVERFLAG_DOWN;    /* assume down; ping will mark up if available */
 902             cm_PingServer(tsp);                 /* Obtain Capabilities and check up/down state */
 903         }
 904     }
 905     return tsp;
 906 }
 907
 908 cm_server_t *
 909 cm_FindServerByIP(afs_uint32 ipaddr, int type)
 910 {
 911     cm_server_t *tsp;
 912
 913     lock_ObtainRead(&cm_serverLock);
 914     for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
 915         if (tsp->type == type &&
 916             tsp->addr.sin_addr.S_un.S_addr == ipaddr)
 917             break;
 918     }
 919     lock_ReleaseRead(&cm_serverLock);
 920
 921     return tsp;
 922 }
 923
 924 /* find a server based on its properties */
 925 cm_server_t *cm_FindServer(struct sockaddr_in *addrp, int type)
 926 {
 927     cm_server_t *tsp;
 928
 929     osi_assertx(addrp->sin_family == AF_INET, "unexpected socket value");
 930
 931     lock_ObtainWrite(&cm_serverLock);
 932     for (tsp = cm_allServersp; tsp; tsp=tsp->allNextp) {
 933         if (tsp->type == type &&
 934             tsp->addr.sin_addr.s_addr == addrp->sin_addr.s_addr)
 935             break;
 936     }
 937
 938     /* bump ref count if we found the server */
 939     if (tsp)
 940         cm_GetServerNoLock(tsp);
 941
 942     /* drop big table lock */
 943     lock_ReleaseWrite(&cm_serverLock);
 944
 945     /* return what we found */
 946     return tsp;
 947 }
 948
 949 cm_server_vols_t *cm_NewServerVols(void) {
 950     cm_server_vols_t *tsvp;
 951
 952     tsvp = malloc(sizeof(*tsvp));
 953     if (tsvp)
 954         memset(tsvp, 0, sizeof(*tsvp));
 955
 956     return tsvp;
 957 }
 958
 959 cm_serverRef_t *cm_NewServerRef(cm_server_t *serverp, afs_uint32 volID)
 960 {
 961     cm_serverRef_t *tsrp;
 962     cm_server_vols_t **tsrvpp = NULL;
 963     afs_uint32 *slotp = NULL;
 964     int found = 0;
 965
 966     cm_GetServer(serverp);
 967     tsrp = malloc(sizeof(*tsrp));
 968     tsrp->server = serverp;
 969     tsrp->status = srv_not_busy;
 970     tsrp->next = NULL;
 971     tsrp->volID = volID;
 972     tsrp->refCount = 1;
 973
 974     /* if we have a non-zero volID, we need to add it to the list
 975      * of volumes maintained by the server.  There are two phases:
 976      * (1) see if the volID is already in the list and (2) insert
 977      * it into the first empty slot if it is not.
 978      */
 979     if (volID) {
 980         lock_ObtainMutex(&serverp->mx);
 981
 982         tsrvpp = &serverp->vols;
 983         while (*tsrvpp) {
 984             int i;
 985
 986             for (i=0; i<NUM_SERVER_VOLS; i++) {
 987                 if ((*tsrvpp)->ids[i] == volID) {
 988                     found = 1;
 989                     break;
 990                 } else if (!slotp && (*tsrvpp)->ids[i] == 0) {
 991                     slotp = &(*tsrvpp)->ids[i];
 992                 }
 993             }
 994
 995             if (found)
 996                 break;
 997
 998             tsrvpp = &(*tsrvpp)->nextp;
 999         }
1000
1001         if (!found) {
1002             if (slotp) {
1003                 *slotp = volID;
1004             } else {
1005                 /* if we didn't find an empty slot in a current
1006                  * page we must need a new page */
1007                 *tsrvpp = cm_NewServerVols();
1008                 if (*tsrvpp)
1009                     (*tsrvpp)->ids[0] = volID;
1010             }
1011         }
1012
1013         lock_ReleaseMutex(&serverp->mx);
1014     }
1015
1016     return tsrp;
1017 }
1018
1019 LONG_PTR cm_ChecksumServerList(cm_serverRef_t *serversp)
1020 {
1021     LONG_PTR sum = 0;
1022     int first = 1;
1023     cm_serverRef_t *tsrp;
1024
1025     lock_ObtainWrite(&cm_serverLock);
1026     for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
1027         if (first)
1028             first = 0;
1029         else
1030             sum <<= 1;
1031         sum ^= (LONG_PTR) tsrp->server;
1032     }
1033
1034     lock_ReleaseWrite(&cm_serverLock);
1035     return sum;
1036 }
1037
1038 /*
1039 ** Insert a server into the server list keeping the list sorted in
1040 ** asending order of ipRank.
1041 **
1042 ** The refCount of the cm_serverRef_t is increased
1043 */
1044 void cm_InsertServerList(cm_serverRef_t** list, cm_serverRef_t* element)
1045 {
1046     cm_serverRef_t      *current=*list;
1047     unsigned short ipRank = element->server->ipRank;
1048
1049     lock_ObtainWrite(&cm_serverLock);
1050     element->refCount++;                /* increase refCount */
1051
1052     /* insertion into empty list  or at the beginning of the list */
1053     if ( !current || (current->server->ipRank > ipRank) )
1054     {
1055         element->next = *list;
1056         *list = element;
1057         lock_ReleaseWrite(&cm_serverLock);
1058         return ;
1059     }
1060
1061     while ( current->next ) /* find appropriate place to insert */
1062     {
1063         if ( current->next->server->ipRank > ipRank )
1064             break;
1065         else current = current->next;
1066     }
1067     element->next = current->next;
1068     current->next = element;
1069     lock_ReleaseWrite(&cm_serverLock);
1070 }
1071 /*
1072 ** Re-sort the server list with the modified rank
1073 ** returns 0 if element was changed successfully.
1074 ** returns 1 if  list remained unchanged.
1075 */
1076 long cm_ChangeRankServer(cm_serverRef_t** list, cm_server_t*    server)
1077 {
1078     cm_serverRef_t  **current=list;
1079     cm_serverRef_t      *element=0;
1080
1081     /* if there is max of one element in the list, nothing to sort */
1082     if ( (!*current) || !((*current)->next)  )
1083         return 1;               /* list unchanged: return success */
1084
1085     lock_ObtainWrite(&cm_serverLock);
1086     /* if the server is on the list, delete it from list */
1087     while ( *current )
1088     {
1089         if ( (*current)->server == server)
1090         {
1091             element = (*current);
1092             *current = (*current)->next; /* delete it */
1093             break;
1094         }
1095         current = & ( (*current)->next);
1096     }
1097     lock_ReleaseWrite(&cm_serverLock);
1098
1099     /* if this volume is not replicated on this server  */
1100     if (!element)
1101         return 1;       /* server is not on list */
1102
1103     /* re-insert deleted element into the list with modified rank*/
1104     cm_InsertServerList(list, element);
1105
1106     /* reduce refCount which was increased by cm_InsertServerList */
1107     lock_ObtainWrite(&cm_serverLock);
1108     element->refCount--;
1109     lock_ReleaseWrite(&cm_serverLock);
1110     return 0;
1111 }
1112 /*
1113 ** If there are more than one server on the list and the first n servers on
1114 ** the list have the same rank( n>1), then randomise among the first n servers.
1115 */
1116 void cm_RandomizeServer(cm_serverRef_t** list)
1117 {
1118     int                 count, picked;
1119     cm_serverRef_t*     tsrp = *list, *lastTsrp;
1120     unsigned short      lowestRank;
1121
1122     /* an empty list or a list with only one element */
1123     if ( !tsrp || ! tsrp->next )
1124         return ;
1125
1126     lock_ObtainWrite(&cm_serverLock);
1127
1128     /* count the number of servers with the lowest rank */
1129     lowestRank = tsrp->server->ipRank;
1130     for ( count=1, tsrp=tsrp->next; tsrp; tsrp=tsrp->next)
1131     {
1132         if ( tsrp->server->ipRank != lowestRank)
1133             break;
1134         else
1135             count++;
1136     }
1137
1138     /* if there is only one server with the lowest rank, we are done */
1139     if ( count <= 1 ) {
1140         lock_ReleaseWrite(&cm_serverLock);
1141         return ;
1142     }
1143
1144     picked = rand() % count;
1145     if ( !picked ) {
1146         lock_ReleaseWrite(&cm_serverLock);
1147         return ;
1148     }
1149
1150     tsrp = *list;
1151     while (--picked >= 0)
1152     {
1153         lastTsrp = tsrp;
1154         tsrp = tsrp->next;
1155     }
1156     lastTsrp->next = tsrp->next;  /* delete random element from list*/
1157     tsrp->next     = *list; /* insert element at the beginning of list */
1158     *list          = tsrp;
1159     lock_ReleaseWrite(&cm_serverLock);
1160 }
1161
1162 /* call cm_FreeServer while holding a write lock on cm_serverLock */
1163 void cm_FreeServer(cm_server_t* serverp)
1164 {
1165     cm_server_vols_t * tsrvp, *nextp;
1166
1167     cm_PutServerNoLock(serverp);
1168     if (serverp->refCount == 0)
1169     {
1170         /* we need to check to ensure that all of the connections
1171          * for this server have a 0 refCount; otherwise, they will
1172          * not be garbage collected
1173          */
1174         cm_GCConnections(serverp);  /* connsp */
1175
1176         if (!(serverp->flags & CM_SERVERFLAG_PREF_SET)) {
1177             switch (serverp->type) {
1178             case CM_SERVER_VLDB:
1179                 cm_numVldbServers--;
1180                 break;
1181             case CM_SERVER_FILE:
1182                 cm_numFileServers--;
1183                 break;
1184             }
1185
1186             lock_FinalizeMutex(&serverp->mx);
1187             if ( cm_allServersp == serverp )
1188                 cm_allServersp = serverp->allNextp;
1189             else {
1190                 cm_server_t *tsp;
1191
1192                 for(tsp = cm_allServersp; tsp->allNextp; tsp=tsp->allNextp) {
1193                     if ( tsp->allNextp == serverp ) {
1194                         tsp->allNextp = serverp->allNextp;
1195                         break;
1196                     }
1197                 }
1198             }
1199
1200             /* free the volid list */
1201             for ( tsrvp = serverp->vols; tsrvp; tsrvp = nextp) {
1202                 nextp = tsrvp->nextp;
1203                 free(tsrvp);
1204             }
1205
1206             free(serverp);
1207         }
1208     }
1209 }
1210
1211 void cm_RemoveVolumeFromServer(cm_server_t * serverp, afs_uint32 volID)
1212 {
1213     cm_server_vols_t * tsrvp;
1214     int i;
1215
1216     if (volID == 0)
1217         return;
1218
1219     for (tsrvp = serverp->vols; tsrvp; tsrvp = tsrvp->nextp) {
1220         for (i=0; i<NUM_SERVER_VOLS; i++) {
1221             if (tsrvp->ids[i] == volID) {
1222                 tsrvp->ids[i] = 0;;
1223                 break;
1224             }
1225         }
1226     }
1227 }
1228
1229 void cm_FreeServerList(cm_serverRef_t** list, afs_uint32 flags)
1230 {
1231     cm_serverRef_t  **current = list;
1232     cm_serverRef_t  **nextp = 0;
1233     cm_serverRef_t  * next = 0;
1234
1235     lock_ObtainWrite(&cm_serverLock);
1236
1237     while (*current)
1238     {
1239         nextp = &(*current)->next;
1240         if (--((*current)->refCount) == 0) {
1241             next = *nextp;
1242
1243             if ((*current)->volID)
1244                 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
1245             cm_FreeServer((*current)->server);
1246             free(*current);
1247             *current = next;
1248         } else {
1249             if (flags & CM_FREESERVERLIST_DELETE) {
1250                 (*current)->status = srv_deleted;
1251                 if ((*current)->volID)
1252                     cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
1253             }
1254             current = nextp;
1255         }
1256     }
1257
1258     lock_ReleaseWrite(&cm_serverLock);
1259 }