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>
18 #include <sys/socket.h>
25 #include <WINNT\syscfg.h>
29 osi_rwlock_t cm_serverLock;
31 cm_server_t *cm_allServersp;
34 cm_ForceNewConnectionsAllServers(void)
38 lock_ObtainWrite(&cm_serverLock);
39 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
40 cm_GetServerNoLock(tsp);
41 cm_ForceNewConnections(tsp);
42 cm_PutServerNoLock(tsp);
44 lock_ReleaseWrite(&cm_serverLock);
48 cm_PingServer(cm_server_t *tsp)
53 struct rx_connection * rxconnp;
56 Capabilities caps = {0, 0};
60 lock_ObtainMutex(&tsp->mx);
61 if (tsp->flags & CM_SERVERFLAG_PINGING) {
63 osi_SleepM((LONG_PTR)tsp, &tsp->mx);
64 lock_ObtainMutex(&tsp->mx);
66 if (tsp->waitCount == 0)
67 tsp->flags &= ~CM_SERVERFLAG_PINGING;
69 osi_Wakeup((LONG_PTR)tsp);
70 lock_ReleaseMutex(&tsp->mx);
73 tsp->flags |= CM_SERVERFLAG_PINGING;
74 wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
75 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
76 lock_ReleaseMutex(&tsp->mx);
78 code = cm_ConnByServer(tsp, cm_rootUserp, &connp);
80 /* now call the appropriate ping call. Drop the timeout if
81 * the server is known to be down, so that we don't waste a
82 * lot of time retiming out down servers.
85 osi_Log4(afsd_logp, "cm_PingServer server %s (%s) was %s with caps 0x%x",
86 osi_LogSaveString(afsd_logp, hoststr),
87 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
88 wasDown ? "down" : "up",
91 rxconnp = cm_GetRxConn(connp);
93 rx_SetConnDeadTime(rxconnp, 10);
94 if (tsp->type == CM_SERVER_VLDB) {
95 code = VL_ProbeServer(rxconnp);
99 code = RXAFS_GetCapabilities(rxconnp, &caps);
100 if (code == RXGEN_OPCODE)
101 code = RXAFS_GetTime(rxconnp, &secs, &usecs);
104 rx_SetConnDeadTime(rxconnp, ConnDeadtimeout);
105 rx_PutConnection(rxconnp);
107 } /* got an unauthenticated connection to this server */
109 lock_ObtainMutex(&tsp->mx);
111 /* mark server as up */
112 tsp->flags &= ~CM_SERVERFLAG_DOWN;
115 /* we currently handle 32-bits of capabilities */
116 if (caps.Capabilities_len > 0) {
117 tsp->capabilities = caps.Capabilities_val[0];
118 free(caps.Capabilities_val);
119 caps.Capabilities_len = 0;
120 caps.Capabilities_val = 0;
122 tsp->capabilities = 0;
125 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is up with caps 0x%x",
126 osi_LogSaveString(afsd_logp, hoststr),
127 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
130 /* Now update the volume status if necessary */
132 cm_server_vols_t * tsrvp;
136 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
137 for (i=0; i<NUM_SERVER_VOLS; i++) {
138 if (tsrvp->ids[i] != 0) {
141 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
142 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
144 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
152 /* mark server as down */
153 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
154 tsp->flags |= CM_SERVERFLAG_DOWN;
155 tsp->downTime = osi_Time();
157 if (code != VRESTARTING)
158 cm_ForceNewConnections(tsp);
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",
165 /* Now update the volume status if necessary */
167 cm_server_vols_t * tsrvp;
171 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
172 for (i=0; i<NUM_SERVER_VOLS; i++) {
173 if (tsrvp->ids[i] != 0) {
176 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
177 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
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) {
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;
377 tsp->flags = CM_SERVERFLAG_DOWN; /* assume down; ping will mark up if available */
379 cm_SetServerPrefs(tsp);
381 lock_ObtainWrite(&cm_serverLock); /* get server lock */
382 tsp->allNextp = cm_allServersp;
383 cm_allServersp = tsp;
384 lock_ReleaseWrite(&cm_serverLock); /* release server lock */
386 cm_PingServer(tsp); /* Obtain Capabilities and check up/down state */
392 cm_FindServerByIP(afs_uint32 ipaddr, int type)
396 lock_ObtainRead(&cm_serverLock);
397 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
398 if (tsp->type == type &&
399 tsp->addr.sin_addr.S_un.S_addr == ipaddr)
402 lock_ReleaseRead(&cm_serverLock);
407 /* find a server based on its properties */
408 cm_server_t *cm_FindServer(struct sockaddr_in *addrp, int type)
412 osi_assertx(addrp->sin_family == AF_INET, "unexpected socket value");
414 lock_ObtainWrite(&cm_serverLock);
415 for (tsp = cm_allServersp; tsp; tsp=tsp->allNextp) {
416 if (tsp->type == type &&
417 tsp->addr.sin_addr.s_addr == addrp->sin_addr.s_addr)
421 /* bump ref count if we found the server */
423 cm_GetServerNoLock(tsp);
425 /* drop big table lock */
426 lock_ReleaseWrite(&cm_serverLock);
428 /* return what we found */
432 cm_server_vols_t *cm_NewServerVols(void) {
433 cm_server_vols_t *tsvp;
435 tsvp = malloc(sizeof(*tsvp));
437 memset(tsvp, 0, sizeof(*tsvp));
442 cm_serverRef_t *cm_NewServerRef(cm_server_t *serverp, afs_uint32 volID)
444 cm_serverRef_t *tsrp;
445 cm_server_vols_t **tsrvpp = NULL;
446 afs_uint32 *slotp = NULL;
449 cm_GetServer(serverp);
450 tsrp = malloc(sizeof(*tsrp));
451 tsrp->server = serverp;
452 tsrp->status = srv_not_busy;
457 /* if we have a non-zero volID, we need to add it to the list
458 * of volumes maintained by the server. There are two phases:
459 * (1) see if the volID is already in the list and (2) insert
460 * it into the first empty slot if it is not.
463 lock_ObtainMutex(&serverp->mx);
465 tsrvpp = &serverp->vols;
469 for (i=0; i<NUM_SERVER_VOLS; i++) {
470 if ((*tsrvpp)->ids[i] == volID) {
473 } else if (!slotp && (*tsrvpp)->ids[i] == 0) {
474 slotp = &(*tsrvpp)->ids[i];
481 tsrvpp = &(*tsrvpp)->nextp;
488 /* if we didn't find an empty slot in a current
489 * page we must need a new page */
490 *tsrvpp = cm_NewServerVols();
492 (*tsrvpp)->ids[0] = volID;
496 lock_ReleaseMutex(&serverp->mx);
502 LONG_PTR cm_ChecksumServerList(cm_serverRef_t *serversp)
506 cm_serverRef_t *tsrp;
508 lock_ObtainWrite(&cm_serverLock);
509 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
514 sum ^= (LONG_PTR) tsrp->server;
517 lock_ReleaseWrite(&cm_serverLock);
522 ** Insert a server into the server list keeping the list sorted in
523 ** asending order of ipRank.
525 ** The refCount of the cm_serverRef_t is increased
527 void cm_InsertServerList(cm_serverRef_t** list, cm_serverRef_t* element)
529 cm_serverRef_t *current=*list;
530 unsigned short ipRank = element->server->ipRank;
532 lock_ObtainWrite(&cm_serverLock);
533 element->refCount++; /* increase refCount */
535 /* insertion into empty list or at the beginning of the list */
536 if ( !current || (current->server->ipRank > ipRank) )
538 element->next = *list;
540 lock_ReleaseWrite(&cm_serverLock);
544 while ( current->next ) /* find appropriate place to insert */
546 if ( current->next->server->ipRank > ipRank )
548 else current = current->next;
550 element->next = current->next;
551 current->next = element;
552 lock_ReleaseWrite(&cm_serverLock);
555 ** Re-sort the server list with the modified rank
556 ** returns 0 if element was changed successfully.
557 ** returns 1 if list remained unchanged.
559 long cm_ChangeRankServer(cm_serverRef_t** list, cm_server_t* server)
561 cm_serverRef_t **current=list;
562 cm_serverRef_t *element=0;
564 /* if there is max of one element in the list, nothing to sort */
565 if ( (!*current) || !((*current)->next) )
566 return 1; /* list unchanged: return success */
568 lock_ObtainWrite(&cm_serverLock);
569 /* if the server is on the list, delete it from list */
572 if ( (*current)->server == server)
574 element = (*current);
575 *current = (*current)->next; /* delete it */
578 current = & ( (*current)->next);
580 lock_ReleaseWrite(&cm_serverLock);
582 /* if this volume is not replicated on this server */
584 return 1; /* server is not on list */
586 /* re-insert deleted element into the list with modified rank*/
587 cm_InsertServerList(list, element);
589 /* reduce refCount which was increased by cm_InsertServerList */
590 lock_ObtainWrite(&cm_serverLock);
592 lock_ReleaseWrite(&cm_serverLock);
596 ** If there are more than one server on the list and the first n servers on
597 ** the list have the same rank( n>1), then randomise among the first n servers.
599 void cm_RandomizeServer(cm_serverRef_t** list)
602 cm_serverRef_t* tsrp = *list, *lastTsrp;
603 unsigned short lowestRank;
605 /* an empty list or a list with only one element */
606 if ( !tsrp || ! tsrp->next )
609 lock_ObtainWrite(&cm_serverLock);
611 /* count the number of servers with the lowest rank */
612 lowestRank = tsrp->server->ipRank;
613 for ( count=1, tsrp=tsrp->next; tsrp; tsrp=tsrp->next)
615 if ( tsrp->server->ipRank != lowestRank)
621 /* if there is only one server with the lowest rank, we are done */
623 lock_ReleaseWrite(&cm_serverLock);
627 picked = rand() % count;
629 lock_ReleaseWrite(&cm_serverLock);
634 while (--picked >= 0)
639 lastTsrp->next = tsrp->next; /* delete random element from list*/
640 tsrp->next = *list; /* insert element at the beginning of list */
642 lock_ReleaseWrite(&cm_serverLock);
645 /* call cm_FreeServer while holding a write lock on cm_serverLock */
646 void cm_FreeServer(cm_server_t* serverp)
648 cm_server_vols_t * tsrvp, *nextp;
650 cm_PutServerNoLock(serverp);
651 if (serverp->refCount == 0)
653 /* we need to check to ensure that all of the connections
654 * for this server have a 0 refCount; otherwise, they will
655 * not be garbage collected
657 cm_GCConnections(serverp); /* connsp */
659 if (!(serverp->flags & CM_SERVERFLAG_PREF_SET)) {
660 lock_FinalizeMutex(&serverp->mx);
661 if ( cm_allServersp == serverp )
662 cm_allServersp = serverp->allNextp;
666 for(tsp = cm_allServersp; tsp->allNextp; tsp=tsp->allNextp) {
667 if ( tsp->allNextp == serverp ) {
668 tsp->allNextp = serverp->allNextp;
674 /* free the volid list */
675 for ( tsrvp = serverp->vols; tsrvp; tsrvp = nextp) {
676 nextp = tsrvp->nextp;
685 void cm_RemoveVolumeFromServer(cm_server_t * serverp, afs_uint32 volID)
687 cm_server_vols_t * tsrvp;
693 for (tsrvp = serverp->vols; tsrvp; tsrvp = tsrvp->nextp) {
694 for (i=0; i<NUM_SERVER_VOLS; i++) {
695 if (tsrvp->ids[i] == volID) {
703 void cm_FreeServerList(cm_serverRef_t** list, afs_uint32 flags)
705 cm_serverRef_t **current = list;
706 cm_serverRef_t **nextp = 0;
707 cm_serverRef_t * next = 0;
709 lock_ObtainWrite(&cm_serverLock);
713 nextp = &(*current)->next;
714 if (--((*current)->refCount) == 0) {
717 if ((*current)->volID)
718 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
719 cm_FreeServer((*current)->server);
723 if (flags & CM_FREESERVERLIST_DELETE) {
724 (*current)->status = srv_deleted;
725 if ((*current)->volID)
726 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
732 lock_ReleaseWrite(&cm_serverLock);