2 * Copyright 2000, International Business Machines Corporation and others.
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
10 #include <afs/param.h>
21 #include <WINNT\syscfg.h>
25 osi_rwlock_t cm_serverLock;
27 cm_server_t *cm_allServersp;
30 cm_ForceNewConnectionsAllServers(void)
34 lock_ObtainWrite(&cm_serverLock);
35 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
36 cm_GetServerNoLock(tsp);
37 cm_ForceNewConnections(tsp);
38 cm_PutServerNoLock(tsp);
40 lock_ReleaseWrite(&cm_serverLock);
44 cm_PingServer(cm_server_t *tsp)
49 struct rx_connection * rxconnp;
52 Capabilities caps = {0, 0};
56 lock_ObtainMutex(&tsp->mx);
57 if (tsp->flags & CM_SERVERFLAG_PINGING) {
59 osi_SleepM((LONG_PTR)tsp, &tsp->mx);
60 lock_ObtainMutex(&tsp->mx);
62 if (tsp->waitCount == 0)
63 tsp->flags &= ~CM_SERVERFLAG_PINGING;
65 osi_Wakeup((LONG_PTR)tsp);
66 lock_ReleaseMutex(&tsp->mx);
69 tsp->flags |= CM_SERVERFLAG_PINGING;
70 wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
71 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
72 lock_ReleaseMutex(&tsp->mx);
74 code = cm_ConnByServer(tsp, cm_rootUserp, &connp);
76 /* now call the appropriate ping call. Drop the timeout if
77 * the server is known to be down, so that we don't waste a
78 * lot of time retiming out down servers.
81 osi_Log4(afsd_logp, "cm_PingServer server %s (%s) was %s with caps 0x%x",
82 osi_LogSaveString(afsd_logp, hoststr),
83 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
84 wasDown ? "down" : "up",
87 rxconnp = cm_GetRxConn(connp);
89 rx_SetConnDeadTime(rxconnp, 10);
90 if (tsp->type == CM_SERVER_VLDB) {
91 code = VL_ProbeServer(rxconnp);
95 code = RXAFS_GetCapabilities(rxconnp, &caps);
96 if (code == RXGEN_OPCODE)
97 code = RXAFS_GetTime(rxconnp, &secs, &usecs);
100 rx_SetConnDeadTime(rxconnp, ConnDeadtimeout);
101 rx_PutConnection(rxconnp);
103 } /* got an unauthenticated connection to this server */
105 lock_ObtainMutex(&tsp->mx);
107 /* mark server as up */
108 tsp->flags &= ~CM_SERVERFLAG_DOWN;
111 /* we currently handle 32-bits of capabilities */
112 if (caps.Capabilities_len > 0) {
113 tsp->capabilities = caps.Capabilities_val[0];
114 free(caps.Capabilities_val);
115 caps.Capabilities_len = 0;
116 caps.Capabilities_val = 0;
118 tsp->capabilities = 0;
121 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is up with caps 0x%x",
122 osi_LogSaveString(afsd_logp, hoststr),
123 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
126 /* Now update the volume status if necessary */
128 cm_server_vols_t * tsrvp;
132 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
133 for (i=0; i<NUM_SERVER_VOLS; i++) {
134 if (tsrvp->ids[i] != 0) {
137 lock_ReleaseMutex(&tsp->mx);
138 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
139 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
140 lock_ObtainMutex(&tsp->mx);
142 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
150 /* mark server as down */
151 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
152 tsp->flags |= CM_SERVERFLAG_DOWN;
153 tsp->downTime = time(NULL);
155 if (code != VRESTARTING)
156 cm_ForceNewConnections(tsp);
158 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is down with caps 0x%x",
159 osi_LogSaveString(afsd_logp, hoststr),
160 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
163 /* Now update the volume status if necessary */
165 cm_server_vols_t * tsrvp;
169 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
170 for (i=0; i<NUM_SERVER_VOLS; i++) {
171 if (tsrvp->ids[i] != 0) {
174 lock_ReleaseMutex(&tsp->mx);
175 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
176 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
177 lock_ObtainMutex(&tsp->mx);
179 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
188 if (tsp->waitCount == 0)
189 tsp->flags &= ~CM_SERVERFLAG_PINGING;
191 osi_Wakeup((LONG_PTR)tsp);
192 lock_ReleaseMutex(&tsp->mx);
196 void cm_CheckServers(long flags, cm_cell_t *cellp)
198 /* ping all file servers, up or down, with unauthenticated connection,
199 * to find out whether we have all our callbacks from the server still.
200 * Also, ping down VLDBs.
207 lock_ObtainWrite(&cm_serverLock);
208 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
209 cm_GetServerNoLock(tsp);
210 lock_ReleaseWrite(&cm_serverLock);
212 /* now process the server */
213 lock_ObtainMutex(&tsp->mx);
216 isDown = tsp->flags & CM_SERVERFLAG_DOWN;
217 isFS = tsp->type == CM_SERVER_FILE;
219 /* only do the ping if the cell matches the requested cell, or we're
220 * matching all cells (cellp == NULL), and if we've requested to ping
221 * this type of {up, down} servers.
223 if ((cellp == NULL || cellp == tsp->cellp) &&
224 ((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
225 (!isDown && (flags & CM_FLAG_CHECKUPSERVERS))) &&
226 ((!(flags & CM_FLAG_CHECKVLDBSERVERS) ||
227 !isFS && (flags & CM_FLAG_CHECKVLDBSERVERS)) &&
228 (!(flags & CM_FLAG_CHECKFILESERVERS) ||
229 isFS && (flags & CM_FLAG_CHECKFILESERVERS)))) {
231 } /* we're supposed to check this up/down server */
232 lock_ReleaseMutex(&tsp->mx);
234 /* at this point, we've adjusted the server state, so do the ping and
240 /* also, run the GC function for connections on all of the
241 * server's connections.
243 cm_GCConnections(tsp);
245 lock_ObtainWrite(&cm_serverLock);
246 cm_PutServerNoLock(tsp);
248 lock_ReleaseWrite(&cm_serverLock);
251 void cm_InitServer(void)
253 static osi_once_t once;
255 if (osi_Once(&once)) {
256 lock_InitializeRWLock(&cm_serverLock, "cm_serverLock");
261 void cm_GetServer(cm_server_t *serverp)
263 lock_ObtainWrite(&cm_serverLock);
265 lock_ReleaseWrite(&cm_serverLock);
268 void cm_GetServerNoLock(cm_server_t *serverp)
273 void cm_PutServer(cm_server_t *serverp)
275 lock_ObtainWrite(&cm_serverLock);
276 osi_assertx(serverp->refCount-- > 0, "cm_server_t refCount 0");
277 lock_ReleaseWrite(&cm_serverLock);
280 void cm_PutServerNoLock(cm_server_t *serverp)
282 osi_assertx(serverp->refCount-- > 0, "cm_server_t refCount 0");
285 void cm_SetServerNo64Bit(cm_server_t * serverp, int no64bit)
287 lock_ObtainMutex(&serverp->mx);
289 serverp->flags |= CM_SERVERFLAG_NO64BIT;
291 serverp->flags &= ~CM_SERVERFLAG_NO64BIT;
292 lock_ReleaseMutex(&serverp->mx);
295 void cm_SetServerNoInlineBulk(cm_server_t * serverp, int no)
297 lock_ObtainMutex(&serverp->mx);
299 serverp->flags |= CM_SERVERFLAG_NOINLINEBULK;
301 serverp->flags &= ~CM_SERVERFLAG_NOINLINEBULK;
302 lock_ReleaseMutex(&serverp->mx);
305 void cm_SetServerPrefs(cm_server_t * serverp)
307 unsigned long serverAddr; /* in host byte order */
308 unsigned long myAddr, myNet, mySubnet;/* in host byte order */
309 unsigned long netMask;
312 int cm_noIPAddr; /* number of client network interfaces */
313 int cm_IPAddr[CM_MAXINTERFACE_ADDR]; /* client's IP address in host order */
314 int cm_SubnetMask[CM_MAXINTERFACE_ADDR];/* client's subnet mask in host order*/
315 int cm_NetMtu[CM_MAXINTERFACE_ADDR]; /* client's MTU sizes */
316 int cm_NetFlags[CM_MAXINTERFACE_ADDR]; /* network flags */
319 /* get network related info */
320 cm_noIPAddr = CM_MAXINTERFACE_ADDR;
321 code = syscfg_GetIFInfo(&cm_noIPAddr,
322 cm_IPAddr, cm_SubnetMask,
323 cm_NetMtu, cm_NetFlags);
325 serverAddr = ntohl(serverp->addr.sin_addr.s_addr);
326 serverp->ipRank = CM_IPRANK_LOW; /* default setings */
328 for ( i=0; i < cm_noIPAddr; i++)
330 /* loop through all the client's IP address and compare
331 ** each of them against the server's IP address */
333 myAddr = cm_IPAddr[i];
334 if ( IN_CLASSA(myAddr) )
335 netMask = IN_CLASSA_NET;
336 else if ( IN_CLASSB(myAddr) )
337 netMask = IN_CLASSB_NET;
338 else if ( IN_CLASSC(myAddr) )
339 netMask = IN_CLASSC_NET;
343 myNet = myAddr & netMask;
344 mySubnet = myAddr & cm_SubnetMask[i];
346 if ( (serverAddr & netMask) == myNet )
348 if ( (serverAddr & cm_SubnetMask[i]) == mySubnet)
350 if ( serverAddr == myAddr )
351 serverp->ipRank = min(serverp->ipRank,
352 CM_IPRANK_TOP);/* same machine */
353 else serverp->ipRank = min(serverp->ipRank,
354 CM_IPRANK_HI); /* same subnet */
356 else serverp->ipRank = min(serverp->ipRank,CM_IPRANK_MED);
359 /* random between 0..15*/
360 serverp->ipRank += min(serverp->ipRank, rand() % 0x000f);
361 } /* and of for loop */
364 cm_server_t *cm_NewServer(struct sockaddr_in *socketp, int type, cm_cell_t *cellp, afs_uint32 flags) {
367 osi_assertx(socketp->sin_family == AF_INET, "unexpected socket family");
369 tsp = malloc(sizeof(*tsp));
371 memset(tsp, 0, sizeof(*tsp));
375 lock_InitializeMutex(&tsp->mx, "cm_server_t mutex");
376 tsp->addr = *socketp;
378 cm_SetServerPrefs(tsp);
380 lock_ObtainWrite(&cm_serverLock); /* get server lock */
381 tsp->allNextp = cm_allServersp;
382 cm_allServersp = tsp;
383 lock_ReleaseWrite(&cm_serverLock); /* release server lock */
385 if ( !(flags & CM_FLAG_NOPROBE) ) {
386 tsp->flags = CM_SERVERFLAG_DOWN; /* assume down; ping will mark up if available */
387 cm_PingServer(tsp); /* Obtain Capabilities and check up/down state */
394 cm_FindServerByIP(afs_uint32 ipaddr, int type)
398 lock_ObtainRead(&cm_serverLock);
399 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
400 if (tsp->type == type &&
401 tsp->addr.sin_addr.S_un.S_addr == ipaddr)
404 lock_ReleaseRead(&cm_serverLock);
409 /* find a server based on its properties */
410 cm_server_t *cm_FindServer(struct sockaddr_in *addrp, int type)
414 osi_assertx(addrp->sin_family == AF_INET, "unexpected socket value");
416 lock_ObtainWrite(&cm_serverLock);
417 for (tsp = cm_allServersp; tsp; tsp=tsp->allNextp) {
418 if (tsp->type == type &&
419 tsp->addr.sin_addr.s_addr == addrp->sin_addr.s_addr)
423 /* bump ref count if we found the server */
425 cm_GetServerNoLock(tsp);
427 /* drop big table lock */
428 lock_ReleaseWrite(&cm_serverLock);
430 /* return what we found */
434 cm_server_vols_t *cm_NewServerVols(void) {
435 cm_server_vols_t *tsvp;
437 tsvp = malloc(sizeof(*tsvp));
439 memset(tsvp, 0, sizeof(*tsvp));
444 cm_serverRef_t *cm_NewServerRef(cm_server_t *serverp, afs_uint32 volID)
446 cm_serverRef_t *tsrp;
447 cm_server_vols_t **tsrvpp = NULL;
448 afs_uint32 *slotp = NULL;
451 cm_GetServer(serverp);
452 tsrp = malloc(sizeof(*tsrp));
453 tsrp->server = serverp;
454 tsrp->status = srv_not_busy;
459 /* if we have a non-zero volID, we need to add it to the list
460 * of volumes maintained by the server. There are two phases:
461 * (1) see if the volID is already in the list and (2) insert
462 * it into the first empty slot if it is not.
465 lock_ObtainMutex(&serverp->mx);
467 tsrvpp = &serverp->vols;
471 for (i=0; i<NUM_SERVER_VOLS; i++) {
472 if ((*tsrvpp)->ids[i] == volID) {
475 } else if (!slotp && (*tsrvpp)->ids[i] == 0) {
476 slotp = &(*tsrvpp)->ids[i];
483 tsrvpp = &(*tsrvpp)->nextp;
490 /* if we didn't find an empty slot in a current
491 * page we must need a new page */
492 *tsrvpp = cm_NewServerVols();
494 (*tsrvpp)->ids[0] = volID;
498 lock_ReleaseMutex(&serverp->mx);
504 LONG_PTR cm_ChecksumServerList(cm_serverRef_t *serversp)
508 cm_serverRef_t *tsrp;
510 lock_ObtainWrite(&cm_serverLock);
511 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
516 sum ^= (LONG_PTR) tsrp->server;
519 lock_ReleaseWrite(&cm_serverLock);
524 ** Insert a server into the server list keeping the list sorted in
525 ** asending order of ipRank.
527 ** The refCount of the cm_serverRef_t is increased
529 void cm_InsertServerList(cm_serverRef_t** list, cm_serverRef_t* element)
531 cm_serverRef_t *current=*list;
532 unsigned short ipRank = element->server->ipRank;
534 lock_ObtainWrite(&cm_serverLock);
535 element->refCount++; /* increase refCount */
537 /* insertion into empty list or at the beginning of the list */
538 if ( !current || (current->server->ipRank > ipRank) )
540 element->next = *list;
542 lock_ReleaseWrite(&cm_serverLock);
546 while ( current->next ) /* find appropriate place to insert */
548 if ( current->next->server->ipRank > ipRank )
550 else current = current->next;
552 element->next = current->next;
553 current->next = element;
554 lock_ReleaseWrite(&cm_serverLock);
557 ** Re-sort the server list with the modified rank
558 ** returns 0 if element was changed successfully.
559 ** returns 1 if list remained unchanged.
561 long cm_ChangeRankServer(cm_serverRef_t** list, cm_server_t* server)
563 cm_serverRef_t **current=list;
564 cm_serverRef_t *element=0;
566 /* if there is max of one element in the list, nothing to sort */
567 if ( (!*current) || !((*current)->next) )
568 return 1; /* list unchanged: return success */
570 lock_ObtainWrite(&cm_serverLock);
571 /* if the server is on the list, delete it from list */
574 if ( (*current)->server == server)
576 element = (*current);
577 *current = (*current)->next; /* delete it */
580 current = & ( (*current)->next);
582 lock_ReleaseWrite(&cm_serverLock);
584 /* if this volume is not replicated on this server */
586 return 1; /* server is not on list */
588 /* re-insert deleted element into the list with modified rank*/
589 cm_InsertServerList(list, element);
591 /* reduce refCount which was increased by cm_InsertServerList */
592 lock_ObtainWrite(&cm_serverLock);
594 lock_ReleaseWrite(&cm_serverLock);
598 ** If there are more than one server on the list and the first n servers on
599 ** the list have the same rank( n>1), then randomise among the first n servers.
601 void cm_RandomizeServer(cm_serverRef_t** list)
604 cm_serverRef_t* tsrp = *list, *lastTsrp;
605 unsigned short lowestRank;
607 /* an empty list or a list with only one element */
608 if ( !tsrp || ! tsrp->next )
611 lock_ObtainWrite(&cm_serverLock);
613 /* count the number of servers with the lowest rank */
614 lowestRank = tsrp->server->ipRank;
615 for ( count=1, tsrp=tsrp->next; tsrp; tsrp=tsrp->next)
617 if ( tsrp->server->ipRank != lowestRank)
623 /* if there is only one server with the lowest rank, we are done */
625 lock_ReleaseWrite(&cm_serverLock);
629 picked = rand() % count;
631 lock_ReleaseWrite(&cm_serverLock);
636 while (--picked >= 0)
641 lastTsrp->next = tsrp->next; /* delete random element from list*/
642 tsrp->next = *list; /* insert element at the beginning of list */
644 lock_ReleaseWrite(&cm_serverLock);
647 /* call cm_FreeServer while holding a write lock on cm_serverLock */
648 void cm_FreeServer(cm_server_t* serverp)
650 cm_server_vols_t * tsrvp, *nextp;
652 cm_PutServerNoLock(serverp);
653 if (serverp->refCount == 0)
655 /* we need to check to ensure that all of the connections
656 * for this server have a 0 refCount; otherwise, they will
657 * not be garbage collected
659 cm_GCConnections(serverp); /* connsp */
661 if (!(serverp->flags & CM_SERVERFLAG_PREF_SET)) {
662 lock_FinalizeMutex(&serverp->mx);
663 if ( cm_allServersp == serverp )
664 cm_allServersp = serverp->allNextp;
668 for(tsp = cm_allServersp; tsp->allNextp; tsp=tsp->allNextp) {
669 if ( tsp->allNextp == serverp ) {
670 tsp->allNextp = serverp->allNextp;
676 /* free the volid list */
677 for ( tsrvp = serverp->vols; tsrvp; tsrvp = nextp) {
678 nextp = tsrvp->nextp;
687 void cm_RemoveVolumeFromServer(cm_server_t * serverp, afs_uint32 volID)
689 cm_server_vols_t * tsrvp;
695 for (tsrvp = serverp->vols; tsrvp; tsrvp = tsrvp->nextp) {
696 for (i=0; i<NUM_SERVER_VOLS; i++) {
697 if (tsrvp->ids[i] == volID) {
705 void cm_FreeServerList(cm_serverRef_t** list, afs_uint32 flags)
707 cm_serverRef_t **current = list;
708 cm_serverRef_t **nextp = 0;
709 cm_serverRef_t * next = 0;
711 lock_ObtainWrite(&cm_serverLock);
715 nextp = &(*current)->next;
716 if (--((*current)->refCount) == 0) {
719 if ((*current)->volID)
720 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
721 cm_FreeServer((*current)->server);
725 if (flags & CM_FREESERVERLIST_DELETE) {
726 (*current)->status = srv_deleted;
727 if ((*current)->volID)
728 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
734 lock_ReleaseWrite(&cm_serverLock);