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>
24 osi_rwlock_t cm_serverLock;
26 cm_server_t *cm_allServersp;
29 cm_ForceNewConnectionsAllServers(void)
33 lock_ObtainRead(&cm_serverLock);
34 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
35 cm_GetServerNoLock(tsp);
36 cm_ForceNewConnections(tsp);
37 cm_PutServerNoLock(tsp);
39 lock_ReleaseRead(&cm_serverLock);
43 cm_PingServer(cm_server_t *tsp)
48 struct rx_connection * rxconnp;
51 Capabilities caps = {0, 0};
55 lock_ObtainMutex(&tsp->mx);
56 if (tsp->flags & CM_SERVERFLAG_PINGING) {
58 osi_SleepM((LONG_PTR)tsp, &tsp->mx);
59 lock_ObtainMutex(&tsp->mx);
61 if (tsp->waitCount == 0)
62 tsp->flags &= ~CM_SERVERFLAG_PINGING;
64 osi_Wakeup((LONG_PTR)tsp);
65 lock_ReleaseMutex(&tsp->mx);
68 tsp->flags |= CM_SERVERFLAG_PINGING;
69 wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
70 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
71 lock_ReleaseMutex(&tsp->mx);
73 code = cm_ConnByServer(tsp, cm_rootUserp, &connp);
75 /* now call the appropriate ping call. Drop the timeout if
76 * the server is known to be down, so that we don't waste a
77 * lot of time retiming out down servers.
80 osi_Log4(afsd_logp, "cm_PingServer server %s (%s) was %s with caps 0x%x",
81 osi_LogSaveString(afsd_logp, hoststr),
82 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
83 wasDown ? "down" : "up",
87 rx_SetConnDeadTime(connp->callp, 10);
88 if (tsp->type == CM_SERVER_VLDB) {
89 code = VL_ProbeServer(connp->callp);
93 rxconnp = cm_GetRxConn(connp);
94 code = RXAFS_GetCapabilities(rxconnp, &caps);
95 if (code == RXGEN_OPCODE)
96 code = RXAFS_GetTime(rxconnp, &secs, &usecs);
97 rx_PutConnection(rxconnp);
100 rx_SetConnDeadTime(connp->callp, ConnDeadtimeout);
102 } /* got an unauthenticated connection to this server */
104 lock_ObtainMutex(&tsp->mx);
106 /* mark server as up */
107 tsp->flags &= ~CM_SERVERFLAG_DOWN;
109 /* we currently handle 32-bits of capabilities */
110 if (caps.Capabilities_len > 0) {
111 tsp->capabilities = caps.Capabilities_val[0];
112 free(caps.Capabilities_val);
113 caps.Capabilities_len = 0;
114 caps.Capabilities_val = 0;
116 tsp->capabilities = 0;
119 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is up with caps 0x%x",
120 osi_LogSaveString(afsd_logp, hoststr),
121 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
124 /* Now update the volume status if necessary */
126 cm_server_vols_t * tsrvp;
130 lock_ReleaseMutex(&tsp->mx);
131 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
132 for (i=0; i<NUM_SERVER_VOLS; i++) {
133 if (tsrvp->ids[i] != 0) {
136 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
137 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
139 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
145 lock_ObtainMutex(&tsp->mx);
148 /* mark server as down */
149 tsp->flags |= CM_SERVERFLAG_DOWN;
150 if (code != VRESTARTING)
151 cm_ForceNewConnections(tsp);
153 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is down with caps 0x%x",
154 osi_LogSaveString(afsd_logp, hoststr),
155 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
158 /* Now update the volume status if necessary */
160 cm_server_vols_t * tsrvp;
164 lock_ReleaseMutex(&tsp->mx);
165 for (tsrvp = tsp->vols; tsrvp; tsrvp = tsrvp->nextp) {
166 for (i=0; i<NUM_SERVER_VOLS; i++) {
167 if (tsrvp->ids[i] != 0) {
170 code = cm_GetVolumeByID(tsp->cellp, tsrvp->ids[i], cm_rootUserp,
171 &req, CM_GETVOL_FLAG_NO_LRU_UPDATE, &volp);
173 cm_UpdateVolumeStatus(volp, tsrvp->ids[i]);
179 lock_ObtainMutex(&tsp->mx);
183 if (tsp->waitCount == 0)
184 tsp->flags &= ~CM_SERVERFLAG_PINGING;
186 osi_Wakeup((LONG_PTR)tsp);
187 lock_ReleaseMutex(&tsp->mx);
191 void cm_CheckServers(long flags, cm_cell_t *cellp)
193 /* ping all file servers, up or down, with unauthenticated connection,
194 * to find out whether we have all our callbacks from the server still.
195 * Also, ping down VLDBs.
201 lock_ObtainWrite(&cm_serverLock);
202 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
203 cm_GetServerNoLock(tsp);
204 lock_ReleaseWrite(&cm_serverLock);
206 /* now process the server */
207 lock_ObtainMutex(&tsp->mx);
210 isDown = tsp->flags & CM_SERVERFLAG_DOWN;
212 /* only do the ping if the cell matches the requested cell, or we're
213 * matching all cells (cellp == NULL), and if we've requested to ping
214 * this type of {up, down} servers.
216 if ((cellp == NULL || cellp == tsp->cellp) &&
217 ((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
218 (!isDown && (flags & CM_FLAG_CHECKUPSERVERS)))) {
220 } /* we're supposed to check this up/down server */
221 lock_ReleaseMutex(&tsp->mx);
223 /* at this point, we've adjusted the server state, so do the ping and
229 /* also, run the GC function for connections on all of the
230 * server's connections.
232 cm_GCConnections(tsp);
234 lock_ObtainWrite(&cm_serverLock);
235 cm_PutServerNoLock(tsp);
237 lock_ReleaseWrite(&cm_serverLock);
240 void cm_InitServer(void)
242 static osi_once_t once;
244 if (osi_Once(&once)) {
245 lock_InitializeRWLock(&cm_serverLock, "cm_serverLock");
250 void cm_GetServer(cm_server_t *serverp)
252 lock_ObtainWrite(&cm_serverLock);
254 lock_ReleaseWrite(&cm_serverLock);
257 void cm_GetServerNoLock(cm_server_t *serverp)
262 void cm_PutServer(cm_server_t *serverp)
264 lock_ObtainWrite(&cm_serverLock);
265 osi_assert(serverp->refCount-- > 0);
266 lock_ReleaseWrite(&cm_serverLock);
269 void cm_PutServerNoLock(cm_server_t *serverp)
271 osi_assert(serverp->refCount-- > 0);
274 void cm_SetServerNo64Bit(cm_server_t * serverp, int no64bit)
276 lock_ObtainMutex(&serverp->mx);
278 serverp->flags |= CM_SERVERFLAG_NO64BIT;
280 serverp->flags &= ~CM_SERVERFLAG_NO64BIT;
281 lock_ReleaseMutex(&serverp->mx);
284 void cm_SetServerNoInlineBulk(cm_server_t * serverp, int no)
286 lock_ObtainMutex(&serverp->mx);
288 serverp->flags |= CM_SERVERFLAG_NOINLINEBULK;
290 serverp->flags &= ~CM_SERVERFLAG_NOINLINEBULK;
291 lock_ReleaseMutex(&serverp->mx);
294 void cm_SetServerPrefs(cm_server_t * serverp)
296 unsigned long serverAddr; /* in host byte order */
297 unsigned long myAddr, myNet, mySubnet;/* in host byte order */
298 unsigned long netMask;
301 int cm_noIPAddr; /* number of client network interfaces */
302 int cm_IPAddr[CM_MAXINTERFACE_ADDR]; /* client's IP address in host order */
303 int cm_SubnetMask[CM_MAXINTERFACE_ADDR];/* client's subnet mask in host order*/
304 int cm_NetMtu[CM_MAXINTERFACE_ADDR]; /* client's MTU sizes */
305 int cm_NetFlags[CM_MAXINTERFACE_ADDR]; /* network flags */
308 /* get network related info */
309 cm_noIPAddr = CM_MAXINTERFACE_ADDR;
310 code = syscfg_GetIFInfo(&cm_noIPAddr,
311 cm_IPAddr, cm_SubnetMask,
312 cm_NetMtu, cm_NetFlags);
314 serverAddr = ntohl(serverp->addr.sin_addr.s_addr);
315 serverp->ipRank = CM_IPRANK_LOW; /* default setings */
317 for ( i=0; i < cm_noIPAddr; i++)
319 /* loop through all the client's IP address and compare
320 ** each of them against the server's IP address */
322 myAddr = cm_IPAddr[i];
323 if ( IN_CLASSA(myAddr) )
324 netMask = IN_CLASSA_NET;
325 else if ( IN_CLASSB(myAddr) )
326 netMask = IN_CLASSB_NET;
327 else if ( IN_CLASSC(myAddr) )
328 netMask = IN_CLASSC_NET;
332 myNet = myAddr & netMask;
333 mySubnet = myAddr & cm_SubnetMask[i];
335 if ( (serverAddr & netMask) == myNet )
337 if ( (serverAddr & cm_SubnetMask[i]) == mySubnet)
339 if ( serverAddr == myAddr )
340 serverp->ipRank = min(serverp->ipRank,
341 CM_IPRANK_TOP);/* same machine */
342 else serverp->ipRank = min(serverp->ipRank,
343 CM_IPRANK_HI); /* same subnet */
345 else serverp->ipRank = min(serverp->ipRank,CM_IPRANK_MED);
348 /* random between 0..15*/
349 serverp->ipRank += min(serverp->ipRank, rand() % 0x000f);
350 } /* and of for loop */
353 cm_server_t *cm_NewServer(struct sockaddr_in *socketp, int type, cm_cell_t *cellp) {
356 osi_assert(socketp->sin_family == AF_INET);
358 tsp = malloc(sizeof(*tsp));
360 memset(tsp, 0, sizeof(*tsp));
364 lock_InitializeMutex(&tsp->mx, "cm_server_t mutex");
365 tsp->addr = *socketp;
366 tsp->flags = CM_SERVERFLAG_DOWN; /* assume down; ping will mark up if available */
368 cm_SetServerPrefs(tsp);
370 lock_ObtainWrite(&cm_serverLock); /* get server lock */
371 tsp->allNextp = cm_allServersp;
372 cm_allServersp = tsp;
373 lock_ReleaseWrite(&cm_serverLock); /* release server lock */
375 cm_PingServer(tsp); /* Obtain Capabilities and check up/down state */
380 /* find a server based on its properties */
381 cm_server_t *cm_FindServer(struct sockaddr_in *addrp, int type)
385 osi_assert(addrp->sin_family == AF_INET);
387 lock_ObtainWrite(&cm_serverLock);
388 for (tsp = cm_allServersp; tsp; tsp=tsp->allNextp) {
389 if (tsp->type == type &&
390 tsp->addr.sin_addr.s_addr == addrp->sin_addr.s_addr)
394 /* bump ref count if we found the server */
396 cm_GetServerNoLock(tsp);
398 /* drop big table lock */
399 lock_ReleaseWrite(&cm_serverLock);
401 /* return what we found */
405 cm_server_vols_t *cm_NewServerVols(void) {
406 cm_server_vols_t *tsvp;
408 tsvp = malloc(sizeof(*tsvp));
410 memset(tsvp, 0, sizeof(*tsvp));
415 cm_serverRef_t *cm_NewServerRef(cm_server_t *serverp, afs_uint32 volID)
417 cm_serverRef_t *tsrp;
418 cm_server_vols_t **tsrvpp = NULL;
419 afs_uint32 *slotp = NULL;
422 cm_GetServer(serverp);
423 tsrp = malloc(sizeof(*tsrp));
424 tsrp->server = serverp;
425 tsrp->status = srv_not_busy;
430 /* if we have a non-zero volID, we need to add it to the list
431 * of volumes maintained by the server. There are two phases:
432 * (1) see if the volID is already in the list and (2) insert
433 * it into the first empty slot if it is not.
436 lock_ObtainMutex(&serverp->mx);
438 tsrvpp = &serverp->vols;
442 for (i=0; i<NUM_SERVER_VOLS; i++) {
443 if ((*tsrvpp)->ids[i] == volID) {
446 } else if (!slotp && (*tsrvpp)->ids[i] == 0) {
447 slotp = &(*tsrvpp)->ids[i];
454 tsrvpp = &(*tsrvpp)->nextp;
461 /* if we didn't find an empty slot in a current
462 * page we must need a new page */
463 *tsrvpp = cm_NewServerVols();
465 (*tsrvpp)->ids[0] = volID;
469 lock_ReleaseMutex(&serverp->mx);
475 LONG_PTR cm_ChecksumServerList(cm_serverRef_t *serversp)
479 cm_serverRef_t *tsrp;
481 lock_ObtainWrite(&cm_serverLock);
482 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
487 sum ^= (LONG_PTR) tsrp->server;
490 lock_ReleaseWrite(&cm_serverLock);
495 ** Insert a server into the server list keeping the list sorted in
496 ** asending order of ipRank.
498 ** The refCount of the cm_serverRef_t is increased
500 void cm_InsertServerList(cm_serverRef_t** list, cm_serverRef_t* element)
502 cm_serverRef_t *current=*list;
503 unsigned short ipRank = element->server->ipRank;
505 lock_ObtainWrite(&cm_serverLock);
506 element->refCount++; /* increase refCount */
508 /* insertion into empty list or at the beginning of the list */
509 if ( !current || (current->server->ipRank > ipRank) )
511 element->next = *list;
513 lock_ReleaseWrite(&cm_serverLock);
517 while ( current->next ) /* find appropriate place to insert */
519 if ( current->next->server->ipRank > ipRank )
521 else current = current->next;
523 element->next = current->next;
524 current->next = element;
525 lock_ReleaseWrite(&cm_serverLock);
528 ** Re-sort the server list with the modified rank
529 ** returns 0 if element was changed successfully.
530 ** returns 1 if list remained unchanged.
532 long cm_ChangeRankServer(cm_serverRef_t** list, cm_server_t* server)
534 cm_serverRef_t **current=list;
535 cm_serverRef_t *element=0;
537 /* if there is max of one element in the list, nothing to sort */
538 if ( (!*current) || !((*current)->next) )
539 return 1; /* list unchanged: return success */
541 lock_ObtainWrite(&cm_serverLock);
542 /* if the server is on the list, delete it from list */
545 if ( (*current)->server == server)
547 element = (*current);
548 *current = (*current)->next; /* delete it */
551 current = & ( (*current)->next);
553 lock_ReleaseWrite(&cm_serverLock);
555 /* if this volume is not replicated on this server */
557 return 1; /* server is not on list */
559 /* re-insert deleted element into the list with modified rank*/
560 cm_InsertServerList(list, element);
562 /* reduce refCount which was increased by cm_InsertServerList */
563 lock_ObtainWrite(&cm_serverLock);
565 lock_ReleaseWrite(&cm_serverLock);
569 ** If there are more than one server on the list and the first n servers on
570 ** the list have the same rank( n>1), then randomise among the first n servers.
572 void cm_RandomizeServer(cm_serverRef_t** list)
575 cm_serverRef_t* tsrp = *list, *lastTsrp;
576 unsigned short lowestRank;
578 /* an empty list or a list with only one element */
579 if ( !tsrp || ! tsrp->next )
582 lock_ObtainWrite(&cm_serverLock);
584 /* count the number of servers with the lowest rank */
585 lowestRank = tsrp->server->ipRank;
586 for ( count=1, tsrp=tsrp->next; tsrp; tsrp=tsrp->next)
588 if ( tsrp->server->ipRank != lowestRank)
594 /* if there is only one server with the lowest rank, we are done */
596 lock_ReleaseWrite(&cm_serverLock);
600 picked = rand() % count;
602 lock_ReleaseWrite(&cm_serverLock);
607 while (--picked >= 0)
612 lastTsrp->next = tsrp->next; /* delete random element from list*/
613 tsrp->next = *list; /* insert element at the beginning of list */
615 lock_ReleaseWrite(&cm_serverLock);
618 /* call cm_FreeServer while holding a write lock on cm_serverLock */
619 void cm_FreeServer(cm_server_t* serverp)
621 cm_server_vols_t * tsrvp, *nextp;
623 cm_PutServerNoLock(serverp);
624 if (serverp->refCount == 0)
626 /* we need to check to ensure that all of the connections
627 * for this server have a 0 refCount; otherwise, they will
628 * not be garbage collected
630 cm_GCConnections(serverp); /* connsp */
632 if (!(serverp->flags & CM_SERVERFLAG_PREF_SET)) {
633 lock_FinalizeMutex(&serverp->mx);
634 if ( cm_allServersp == serverp )
635 cm_allServersp = serverp->allNextp;
639 for(tsp = cm_allServersp; tsp->allNextp; tsp=tsp->allNextp) {
640 if ( tsp->allNextp == serverp ) {
641 tsp->allNextp = serverp->allNextp;
647 /* free the volid list */
648 for ( tsrvp = serverp->vols; tsrvp; tsrvp = nextp) {
649 nextp = tsrvp->nextp;
658 void cm_RemoveVolumeFromServer(cm_server_t * serverp, afs_uint32 volID)
660 cm_server_vols_t * tsrvp;
666 for (tsrvp = serverp->vols; tsrvp; tsrvp = tsrvp->nextp) {
667 for (i=0; i<NUM_SERVER_VOLS; i++) {
668 if (tsrvp->ids[i] == volID) {
676 void cm_FreeServerList(cm_serverRef_t** list, afs_uint32 flags)
678 cm_serverRef_t **current = list;
679 cm_serverRef_t **nextp = 0;
680 cm_serverRef_t * next = 0;
682 lock_ObtainWrite(&cm_serverLock);
686 nextp = &(*current)->next;
687 if (--((*current)->refCount) == 0) {
690 if ((*current)->volID)
691 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
692 cm_FreeServer((*current)->server);
696 if (flags & CM_FREESERVERLIST_DELETE) {
697 (*current)->status = srv_deleted;
698 if ((*current)->volID)
699 cm_RemoveVolumeFromServer((*current)->server, (*current)->volID);
705 lock_ReleaseWrite(&cm_serverLock);