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 lock_ReleaseMutex(&tsp->mx);
142 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
143 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
144 lock_ObtainMutex(&tsp->mx);
146 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
154 /* mark server as down */
155 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
156 tsp->flags |= CM_SERVERFLAG_DOWN;
157 tsp->downTime = osi_Time();
159 if (code != VRESTARTING)
160 cm_ForceNewConnections(tsp);
162 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is down with caps 0x%x",
163 osi_LogSaveString(afsd_logp, hoststr),
164 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
167 /* Now update the volume status if necessary */
169 cm_server_vols_t * tsrvp;
173 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
174 for (i=0; i<NUM_SERVER_VOLS; i++) {
175 if (tsrvp->ids[i] != 0) {
178 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
179 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
181 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
190 if (tsp->waitCount == 0)
191 tsp->flags &= ~CM_SERVERFLAG_PINGING;
193 osi_Wakeup((LONG_PTR)tsp);
194 lock_ReleaseMutex(&tsp->mx);
198 void cm_CheckServers(long flags, cm_cell_t *cellp)
200 /* ping all file servers, up or down, with unauthenticated connection,
201 * to find out whether we have all our callbacks from the server still.
202 * Also, ping down VLDBs.
209 lock_ObtainWrite(&cm_serverLock);
210 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
211 cm_GetServerNoLock(tsp);
212 lock_ReleaseWrite(&cm_serverLock);
214 /* now process the server */
215 lock_ObtainMutex(&tsp->mx);
218 isDown = tsp->flags & CM_SERVERFLAG_DOWN;
219 isFS = tsp->type == CM_SERVER_FILE;
221 /* only do the ping if the cell matches the requested cell, or we're
222 * matching all cells (cellp == NULL), and if we've requested to ping
223 * this type of {up, down} servers.
225 if ((cellp == NULL || cellp == tsp->cellp) &&
226 ((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
227 (!isDown && (flags & CM_FLAG_CHECKUPSERVERS))) &&
228 ((!(flags & CM_FLAG_CHECKVLDBSERVERS) ||
229 !isFS && (flags & CM_FLAG_CHECKVLDBSERVERS)) &&
230 (!(flags & CM_FLAG_CHECKFILESERVERS) ||
231 isFS && (flags & CM_FLAG_CHECKFILESERVERS)))) {
233 } /* we're supposed to check this up/down server */
234 lock_ReleaseMutex(&tsp->mx);
236 /* at this point, we've adjusted the server state, so do the ping and
242 /* also, run the GC function for connections on all of the
243 * server's connections.
245 cm_GCConnections(tsp);
247 lock_ObtainWrite(&cm_serverLock);
248 cm_PutServerNoLock(tsp);
250 lock_ReleaseWrite(&cm_serverLock);
253 void cm_InitServer(void)
255 static osi_once_t once;
257 if (osi_Once(&once)) {
258 lock_InitializeRWLock(&cm_serverLock, "cm_serverLock");
263 void cm_GetServer(cm_server_t *serverp)
265 lock_ObtainWrite(&cm_serverLock);
267 lock_ReleaseWrite(&cm_serverLock);
270 void cm_GetServerNoLock(cm_server_t *serverp)
275 void cm_PutServer(cm_server_t *serverp)
277 lock_ObtainWrite(&cm_serverLock);
278 osi_assertx(serverp->refCount-- > 0, "cm_server_t refCount 0");
279 lock_ReleaseWrite(&cm_serverLock);
282 void cm_PutServerNoLock(cm_server_t *serverp)
284 osi_assertx(serverp->refCount-- > 0, "cm_server_t refCount 0");
287 void cm_SetServerNo64Bit(cm_server_t * serverp, int no64bit)
289 lock_ObtainMutex(&serverp->mx);
291 serverp->flags |= CM_SERVERFLAG_NO64BIT;
293 serverp->flags &= ~CM_SERVERFLAG_NO64BIT;
294 lock_ReleaseMutex(&serverp->mx);
297 void cm_SetServerNoInlineBulk(cm_server_t * serverp, int no)
299 lock_ObtainMutex(&serverp->mx);
301 serverp->flags |= CM_SERVERFLAG_NOINLINEBULK;
303 serverp->flags &= ~CM_SERVERFLAG_NOINLINEBULK;
304 lock_ReleaseMutex(&serverp->mx);
307 void cm_SetServerPrefs(cm_server_t * serverp)
309 unsigned long serverAddr; /* in host byte order */
310 unsigned long myAddr, myNet, mySubnet;/* in host byte order */
311 unsigned long netMask;
314 int cm_noIPAddr; /* number of client network interfaces */
315 int cm_IPAddr[CM_MAXINTERFACE_ADDR]; /* client's IP address in host order */
316 int cm_SubnetMask[CM_MAXINTERFACE_ADDR];/* client's subnet mask in host order*/
317 int cm_NetMtu[CM_MAXINTERFACE_ADDR]; /* client's MTU sizes */
318 int cm_NetFlags[CM_MAXINTERFACE_ADDR]; /* network flags */
321 /* get network related info */
322 cm_noIPAddr = CM_MAXINTERFACE_ADDR;
323 code = syscfg_GetIFInfo(&cm_noIPAddr,
324 cm_IPAddr, cm_SubnetMask,
325 cm_NetMtu, cm_NetFlags);
327 serverAddr = ntohl(serverp->addr.sin_addr.s_addr);
328 serverp->ipRank = CM_IPRANK_LOW; /* default setings */
330 for ( i=0; i < cm_noIPAddr; i++)
332 /* loop through all the client's IP address and compare
333 ** each of them against the server's IP address */
335 myAddr = cm_IPAddr[i];
336 if ( IN_CLASSA(myAddr) )
337 netMask = IN_CLASSA_NET;
338 else if ( IN_CLASSB(myAddr) )
339 netMask = IN_CLASSB_NET;
340 else if ( IN_CLASSC(myAddr) )
341 netMask = IN_CLASSC_NET;
345 myNet = myAddr & netMask;
346 mySubnet = myAddr & cm_SubnetMask[i];
348 if ( (serverAddr & netMask) == myNet )
350 if ( (serverAddr & cm_SubnetMask[i]) == mySubnet)
352 if ( serverAddr == myAddr )
353 serverp->ipRank = min(serverp->ipRank,
354 CM_IPRANK_TOP);/* same machine */
355 else serverp->ipRank = min(serverp->ipRank,
356 CM_IPRANK_HI); /* same subnet */
358 else serverp->ipRank = min(serverp->ipRank,CM_IPRANK_MED);
361 /* random between 0..15*/
362 serverp->ipRank += min(serverp->ipRank, rand() % 0x000f);
363 } /* and of for loop */
366 cm_server_t *cm_NewServer(struct sockaddr_in *socketp, int type, cm_cell_t *cellp, afs_uint32 flags) {
369 osi_assertx(socketp->sin_family == AF_INET, "unexpected socket family");
371 tsp = malloc(sizeof(*tsp));
373 memset(tsp, 0, sizeof(*tsp));
377 lock_InitializeMutex(&tsp->mx, "cm_server_t mutex");
378 tsp->addr = *socketp;
379 tsp->flags = CM_SERVERFLAG_DOWN; /* assume down; ping will mark up if available */
381 cm_SetServerPrefs(tsp);
383 lock_ObtainWrite(&cm_serverLock); /* get server lock */
384 tsp->allNextp = cm_allServersp;
385 cm_allServersp = tsp;
386 lock_ReleaseWrite(&cm_serverLock); /* release server lock */
388 if ( !(flags & CM_FLAG_NOPROBE) )
389 cm_PingServer(tsp); /* Obtain Capabilities and check up/down state */
395 cm_FindServerByIP(afs_uint32 ipaddr, int type)
399 lock_ObtainRead(&cm_serverLock);
400 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
401 if (tsp->type == type &&
402 tsp->addr.sin_addr.S_un.S_addr == ipaddr)
405 lock_ReleaseRead(&cm_serverLock);
410 /* find a server based on its properties */
411 cm_server_t *cm_FindServer(struct sockaddr_in *addrp, int type)
415 osi_assertx(addrp->sin_family == AF_INET, "unexpected socket value");
417 lock_ObtainWrite(&cm_serverLock);
418 for (tsp = cm_allServersp; tsp; tsp=tsp->allNextp) {
419 if (tsp->type == type &&
420 tsp->addr.sin_addr.s_addr == addrp->sin_addr.s_addr)
424 /* bump ref count if we found the server */
426 cm_GetServerNoLock(tsp);
428 /* drop big table lock */
429 lock_ReleaseWrite(&cm_serverLock);
431 /* return what we found */
435 cm_server_vols_t *cm_NewServerVols(void) {
436 cm_server_vols_t *tsvp;
438 tsvp = malloc(sizeof(*tsvp));
440 memset(tsvp, 0, sizeof(*tsvp));
445 cm_serverRef_t *cm_NewServerRef(cm_server_t *serverp, afs_uint32 volID)
447 cm_serverRef_t *tsrp;
448 cm_server_vols_t **tsrvpp = NULL;
449 afs_uint32 *slotp = NULL;
452 cm_GetServer(serverp);
453 tsrp = malloc(sizeof(*tsrp));
454 tsrp->server = serverp;
455 tsrp->status = srv_not_busy;
460 /* if we have a non-zero volID, we need to add it to the list
461 * of volumes maintained by the server. There are two phases:
462 * (1) see if the volID is already in the list and (2) insert
463 * it into the first empty slot if it is not.
466 lock_ObtainMutex(&serverp->mx);
468 tsrvpp = &serverp->vols;
472 for (i=0; i<NUM_SERVER_VOLS; i++) {
473 if ((*tsrvpp)->ids[i] == volID) {
476 } else if (!slotp && (*tsrvpp)->ids[i] == 0) {
477 slotp = &(*tsrvpp)->ids[i];
484 tsrvpp = &(*tsrvpp)->nextp;
491 /* if we didn't find an empty slot in a current
492 * page we must need a new page */
493 *tsrvpp = cm_NewServerVols();
495 (*tsrvpp)->ids[0] = volID;
499 lock_ReleaseMutex(&serverp->mx);
505 LONG_PTR cm_ChecksumServerList(cm_serverRef_t *serversp)
509 cm_serverRef_t *tsrp;
511 lock_ObtainWrite(&cm_serverLock);
512 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
517 sum ^= (LONG_PTR) tsrp->server;
520 lock_ReleaseWrite(&cm_serverLock);
525 ** Insert a server into the server list keeping the list sorted in
526 ** asending order of ipRank.
528 ** The refCount of the cm_serverRef_t is increased
530 void cm_InsertServerList(cm_serverRef_t** list, cm_serverRef_t* element)
532 cm_serverRef_t *current=*list;
533 unsigned short ipRank = element->server->ipRank;
535 lock_ObtainWrite(&cm_serverLock);
536 element->refCount++; /* increase refCount */
538 /* insertion into empty list or at the beginning of the list */
539 if ( !current || (current->server->ipRank > ipRank) )
541 element->next = *list;
543 lock_ReleaseWrite(&cm_serverLock);
547 while ( current->next ) /* find appropriate place to insert */
549 if ( current->next->server->ipRank > ipRank )
551 else current = current->next;
553 element->next = current->next;
554 current->next = element;
555 lock_ReleaseWrite(&cm_serverLock);
558 ** Re-sort the server list with the modified rank
559 ** returns 0 if element was changed successfully.
560 ** returns 1 if list remained unchanged.
562 long cm_ChangeRankServer(cm_serverRef_t** list, cm_server_t* server)
564 cm_serverRef_t **current=list;
565 cm_serverRef_t *element=0;
567 /* if there is max of one element in the list, nothing to sort */
568 if ( (!*current) || !((*current)->next) )
569 return 1; /* list unchanged: return success */
571 lock_ObtainWrite(&cm_serverLock);
572 /* if the server is on the list, delete it from list */
575 if ( (*current)->server == server)
577 element = (*current);
578 *current = (*current)->next; /* delete it */
581 current = & ( (*current)->next);
583 lock_ReleaseWrite(&cm_serverLock);
585 /* if this volume is not replicated on this server */
587 return 1; /* server is not on list */
589 /* re-insert deleted element into the list with modified rank*/
590 cm_InsertServerList(list, element);
592 /* reduce refCount which was increased by cm_InsertServerList */
593 lock_ObtainWrite(&cm_serverLock);
595 lock_ReleaseWrite(&cm_serverLock);
599 ** If there are more than one server on the list and the first n servers on
600 ** the list have the same rank( n>1), then randomise among the first n servers.
602 void cm_RandomizeServer(cm_serverRef_t** list)
605 cm_serverRef_t* tsrp = *list, *lastTsrp;
606 unsigned short lowestRank;
608 /* an empty list or a list with only one element */
609 if ( !tsrp || ! tsrp->next )
612 lock_ObtainWrite(&cm_serverLock);
614 /* count the number of servers with the lowest rank */
615 lowestRank = tsrp->server->ipRank;
616 for ( count=1, tsrp=tsrp->next; tsrp; tsrp=tsrp->next)
618 if ( tsrp->server->ipRank != lowestRank)
624 /* if there is only one server with the lowest rank, we are done */
626 lock_ReleaseWrite(&cm_serverLock);
630 picked = rand() % count;
632 lock_ReleaseWrite(&cm_serverLock);
637 while (--picked >= 0)
642 lastTsrp->next = tsrp->next; /* delete random element from list*/
643 tsrp->next = *list; /* insert element at the beginning of list */
645 lock_ReleaseWrite(&cm_serverLock);
648 /* call cm_FreeServer while holding a write lock on cm_serverLock */
649 void cm_FreeServer(cm_server_t* serverp)
651 cm_server_vols_t * tsrvp, *nextp;
653 cm_PutServerNoLock(serverp);
654 if (serverp->refCount == 0)
656 /* we need to check to ensure that all of the connections
657 * for this server have a 0 refCount; otherwise, they will
658 * not be garbage collected
660 cm_GCConnections(serverp); /* connsp */
662 if (!(serverp->flags & CM_SERVERFLAG_PREF_SET)) {
663 lock_FinalizeMutex(&serverp->mx);
664 if ( cm_allServersp == serverp )
665 cm_allServersp = serverp->allNextp;
669 for(tsp = cm_allServersp; tsp->allNextp; tsp=tsp->allNextp) {
670 if ( tsp->allNextp == serverp ) {
671 tsp->allNextp = serverp->allNextp;
677 /* free the volid list */
678 for ( tsrvp = serverp->vols; tsrvp; tsrvp = nextp) {
679 nextp = tsrvp->nextp;
688 void cm_RemoveVolumeFromServer(cm_server_t * serverp, afs_uint32 volID)
690 cm_server_vols_t * tsrvp;
696 for (tsrvp = serverp->vols; tsrvp; tsrvp = tsrvp->nextp) {
697 for (i=0; i<NUM_SERVER_VOLS; i++) {
698 if (tsrvp->ids[i] == volID) {
706 void cm_FreeServerList(cm_serverRef_t** list, afs_uint32 flags)
708 cm_serverRef_t **current = list;
709 cm_serverRef_t **nextp = 0;
710 cm_serverRef_t * next = 0;
712 lock_ObtainWrite(&cm_serverLock);
716 nextp = &(*current)->next;
717 if (--((*current)->refCount) == 0) {
720 if ((*current)->volID)
721 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
722 cm_FreeServer((*current)->server);
726 if (flags & CM_FREESERVERLIST_DELETE) {
727 (*current)->status = srv_deleted;
728 if ((*current)->volID)
729 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
735 lock_ReleaseWrite(&cm_serverLock);