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 * callp;
51 Capabilities caps = {0, 0};
54 lock_ObtainMutex(&tsp->mx);
55 if (tsp->flags & CM_SERVERFLAG_PINGING) {
57 osi_SleepM((LONG_PTR)tsp, &tsp->mx);
58 lock_ObtainMutex(&tsp->mx);
60 if (tsp->waitCount == 0)
61 tsp->flags &= ~CM_SERVERFLAG_PINGING;
63 osi_Wakeup((LONG_PTR)tsp);
64 lock_ReleaseMutex(&tsp->mx);
67 tsp->flags |= CM_SERVERFLAG_PINGING;
68 wasDown = tsp->flags & CM_SERVERFLAG_DOWN;
69 afs_inet_ntoa_r(tsp->addr.sin_addr.S_un.S_addr, hoststr);
70 lock_ReleaseMutex(&tsp->mx);
72 code = cm_ConnByServer(tsp, cm_rootUserp, &connp);
74 /* now call the appropriate ping call. Drop the timeout if
75 * the server is known to be down, so that we don't waste a
76 * lot of time retiming out down servers.
79 osi_Log4(afsd_logp, "cm_PingServer server %s (%s) was %s with caps 0x%x",
80 osi_LogSaveString(afsd_logp, hoststr),
81 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
82 wasDown ? "down" : "up",
86 rx_SetConnDeadTime(connp->callp, 10);
87 if (tsp->type == CM_SERVER_VLDB) {
88 code = VL_ProbeServer(connp->callp);
92 callp = cm_GetRxConn(connp);
93 code = RXAFS_GetCapabilities(callp, &caps);
94 if (code == RXGEN_OPCODE)
95 code = RXAFS_GetTime(callp, &secs, &usecs);
96 rx_PutConnection(callp);
99 rx_SetConnDeadTime(connp->callp, ConnDeadtimeout);
101 } /* got an unauthenticated connection to this server */
103 lock_ObtainMutex(&tsp->mx);
105 /* mark server as up */
106 tsp->flags &= ~CM_SERVERFLAG_DOWN;
108 /* we currently handle 32-bits of capabilities */
109 if (caps.Capabilities_len > 0) {
110 tsp->capabilities = caps.Capabilities_val[0];
111 free(caps.Capabilities_val);
112 caps.Capabilities_len = 0;
113 caps.Capabilities_val = 0;
115 tsp->capabilities = 0;
118 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is up with caps 0x%x",
119 osi_LogSaveString(afsd_logp, hoststr),
120 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
123 /* mark server as down */
124 tsp->flags |= CM_SERVERFLAG_DOWN;
125 if (code != VRESTARTING)
126 cm_ForceNewConnections(tsp);
128 osi_Log3(afsd_logp, "cm_PingServer server %s (%s) is down with caps 0x%x",
129 osi_LogSaveString(afsd_logp, hoststr),
130 tsp->type == CM_SERVER_VLDB ? "vldb" : "file",
134 if (tsp->waitCount == 0)
135 tsp->flags &= ~CM_SERVERFLAG_PINGING;
137 osi_Wakeup((LONG_PTR)tsp);
138 lock_ReleaseMutex(&tsp->mx);
142 void cm_CheckServers(long flags, cm_cell_t *cellp)
144 /* ping all file servers, up or down, with unauthenticated connection,
145 * to find out whether we have all our callbacks from the server still.
146 * Also, ping down VLDBs.
152 lock_ObtainWrite(&cm_serverLock);
153 for (tsp = cm_allServersp; tsp; tsp = tsp->allNextp) {
154 cm_GetServerNoLock(tsp);
155 lock_ReleaseWrite(&cm_serverLock);
157 /* now process the server */
158 lock_ObtainMutex(&tsp->mx);
161 isDown = tsp->flags & CM_SERVERFLAG_DOWN;
163 /* only do the ping if the cell matches the requested cell, or we're
164 * matching all cells (cellp == NULL), and if we've requested to ping
165 * this type of {up, down} servers.
167 if ((cellp == NULL || cellp == tsp->cellp) &&
168 ((isDown && (flags & CM_FLAG_CHECKDOWNSERVERS)) ||
169 (!isDown && (flags & CM_FLAG_CHECKUPSERVERS)))) {
171 } /* we're supposed to check this up/down server */
172 lock_ReleaseMutex(&tsp->mx);
174 /* at this point, we've adjusted the server state, so do the ping and
180 /* also, run the GC function for connections on all of the
181 * server's connections.
183 cm_GCConnections(tsp);
185 lock_ObtainWrite(&cm_serverLock);
186 cm_PutServerNoLock(tsp);
188 lock_ReleaseWrite(&cm_serverLock);
191 void cm_InitServer(void)
193 static osi_once_t once;
195 if (osi_Once(&once)) {
196 lock_InitializeRWLock(&cm_serverLock, "cm_serverLock");
201 void cm_GetServer(cm_server_t *serverp)
203 lock_ObtainWrite(&cm_serverLock);
205 lock_ReleaseWrite(&cm_serverLock);
208 void cm_GetServerNoLock(cm_server_t *serverp)
213 void cm_PutServer(cm_server_t *serverp)
215 lock_ObtainWrite(&cm_serverLock);
216 osi_assert(serverp->refCount-- > 0);
217 lock_ReleaseWrite(&cm_serverLock);
220 void cm_PutServerNoLock(cm_server_t *serverp)
222 osi_assert(serverp->refCount-- > 0);
225 void cm_SetServerNo64Bit(cm_server_t * serverp, int no64bit)
227 lock_ObtainMutex(&serverp->mx);
229 serverp->flags |= CM_SERVERFLAG_NO64BIT;
231 serverp->flags &= ~CM_SERVERFLAG_NO64BIT;
232 lock_ReleaseMutex(&serverp->mx);
235 void cm_SetServerNoInlineBulk(cm_server_t * serverp, int no)
237 lock_ObtainMutex(&serverp->mx);
239 serverp->flags |= CM_SERVERFLAG_NOINLINEBULK;
241 serverp->flags &= ~CM_SERVERFLAG_NOINLINEBULK;
242 lock_ReleaseMutex(&serverp->mx);
245 void cm_SetServerPrefs(cm_server_t * serverp)
247 unsigned long serverAddr; /* in host byte order */
248 unsigned long myAddr, myNet, mySubnet;/* in host byte order */
249 unsigned long netMask;
252 int cm_noIPAddr; /* number of client network interfaces */
253 int cm_IPAddr[CM_MAXINTERFACE_ADDR]; /* client's IP address in host order */
254 int cm_SubnetMask[CM_MAXINTERFACE_ADDR];/* client's subnet mask in host order*/
255 int cm_NetMtu[CM_MAXINTERFACE_ADDR]; /* client's MTU sizes */
256 int cm_NetFlags[CM_MAXINTERFACE_ADDR]; /* network flags */
259 /* get network related info */
260 cm_noIPAddr = CM_MAXINTERFACE_ADDR;
261 code = syscfg_GetIFInfo(&cm_noIPAddr,
262 cm_IPAddr, cm_SubnetMask,
263 cm_NetMtu, cm_NetFlags);
265 serverAddr = ntohl(serverp->addr.sin_addr.s_addr);
266 serverp->ipRank = CM_IPRANK_LOW; /* default setings */
268 for ( i=0; i < cm_noIPAddr; i++)
270 /* loop through all the client's IP address and compare
271 ** each of them against the server's IP address */
273 myAddr = cm_IPAddr[i];
274 if ( IN_CLASSA(myAddr) )
275 netMask = IN_CLASSA_NET;
276 else if ( IN_CLASSB(myAddr) )
277 netMask = IN_CLASSB_NET;
278 else if ( IN_CLASSC(myAddr) )
279 netMask = IN_CLASSC_NET;
283 myNet = myAddr & netMask;
284 mySubnet = myAddr & cm_SubnetMask[i];
286 if ( (serverAddr & netMask) == myNet )
288 if ( (serverAddr & cm_SubnetMask[i]) == mySubnet)
290 if ( serverAddr == myAddr )
291 serverp->ipRank = min(serverp->ipRank,
292 CM_IPRANK_TOP);/* same machine */
293 else serverp->ipRank = min(serverp->ipRank,
294 CM_IPRANK_HI); /* same subnet */
296 else serverp->ipRank = min(serverp->ipRank,CM_IPRANK_MED);
299 /* random between 0..15*/
300 serverp->ipRank += min(serverp->ipRank, rand() % 0x000f);
301 } /* and of for loop */
304 cm_server_t *cm_NewServer(struct sockaddr_in *socketp, int type, cm_cell_t *cellp) {
307 osi_assert(socketp->sin_family == AF_INET);
309 tsp = malloc(sizeof(*tsp));
310 memset(tsp, 0, sizeof(*tsp));
314 lock_InitializeMutex(&tsp->mx, "cm_server_t mutex");
315 tsp->addr = *socketp;
316 tsp->flags = CM_SERVERFLAG_DOWN; /* assume down; ping will mark up if available */
318 cm_SetServerPrefs(tsp);
320 lock_ObtainWrite(&cm_serverLock); /* get server lock */
321 tsp->allNextp = cm_allServersp;
322 cm_allServersp = tsp;
323 lock_ReleaseWrite(&cm_serverLock); /* release server lock */
325 cm_PingServer(tsp); /* Obtain Capabilities and check up/down state */
329 /* find a server based on its properties */
330 cm_server_t *cm_FindServer(struct sockaddr_in *addrp, int type)
334 osi_assert(addrp->sin_family == AF_INET);
336 lock_ObtainWrite(&cm_serverLock);
337 for (tsp = cm_allServersp; tsp; tsp=tsp->allNextp) {
338 if (tsp->type == type &&
339 tsp->addr.sin_addr.s_addr == addrp->sin_addr.s_addr)
343 /* bump ref count if we found the server */
345 cm_GetServerNoLock(tsp);
347 /* drop big table lock */
348 lock_ReleaseWrite(&cm_serverLock);
350 /* return what we found */
354 cm_serverRef_t *cm_NewServerRef(cm_server_t *serverp)
356 cm_serverRef_t *tsrp;
358 cm_GetServer(serverp);
359 tsrp = malloc(sizeof(*tsrp));
360 tsrp->server = serverp;
361 tsrp->status = not_busy;
368 LONG_PTR cm_ChecksumServerList(cm_serverRef_t *serversp)
372 cm_serverRef_t *tsrp;
374 lock_ObtainWrite(&cm_serverLock);
375 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
380 sum ^= (LONG_PTR) tsrp->server;
383 lock_ReleaseWrite(&cm_serverLock);
388 ** Insert a server into the server list keeping the list sorted in
389 ** asending order of ipRank.
391 ** The refCount of the cm_serverRef_t is increased
393 void cm_InsertServerList(cm_serverRef_t** list, cm_serverRef_t* element)
395 cm_serverRef_t *current=*list;
396 unsigned short ipRank = element->server->ipRank;
398 lock_ObtainWrite(&cm_serverLock);
399 element->refCount++; /* increase refCount */
401 /* insertion into empty list or at the beginning of the list */
402 if ( !current || (current->server->ipRank > ipRank) )
404 element->next = *list;
406 lock_ReleaseWrite(&cm_serverLock);
410 while ( current->next ) /* find appropriate place to insert */
412 if ( current->next->server->ipRank > ipRank )
414 else current = current->next;
416 element->next = current->next;
417 current->next = element;
418 lock_ReleaseWrite(&cm_serverLock);
421 ** Re-sort the server list with the modified rank
422 ** returns 0 if element was changed successfully.
423 ** returns 1 if list remained unchanged.
425 long cm_ChangeRankServer(cm_serverRef_t** list, cm_server_t* server)
427 cm_serverRef_t **current=list;
428 cm_serverRef_t *element=0;
430 /* if there is max of one element in the list, nothing to sort */
431 if ( (!*current) || !((*current)->next) )
432 return 1; /* list unchanged: return success */
434 lock_ObtainWrite(&cm_serverLock);
435 /* if the server is on the list, delete it from list */
438 if ( (*current)->server == server)
440 element = (*current);
441 *current = (*current)->next; /* delete it */
444 current = & ( (*current)->next);
446 lock_ReleaseWrite(&cm_serverLock);
448 /* if this volume is not replicated on this server */
450 return 1; /* server is not on list */
452 /* re-insert deleted element into the list with modified rank*/
453 cm_InsertServerList(list, element);
455 /* reduce refCount which was increased by cm_InsertServerList */
456 lock_ObtainWrite(&cm_serverLock);
458 lock_ReleaseWrite(&cm_serverLock);
462 ** If there are more than one server on the list and the first n servers on
463 ** the list have the same rank( n>1), then randomise among the first n servers.
465 void cm_RandomizeServer(cm_serverRef_t** list)
468 cm_serverRef_t* tsrp = *list, *lastTsrp;
469 unsigned short lowestRank;
471 /* an empty list or a list with only one element */
472 if ( !tsrp || ! tsrp->next )
475 lock_ObtainWrite(&cm_serverLock);
477 /* count the number of servers with the lowest rank */
478 lowestRank = tsrp->server->ipRank;
479 for ( count=1, tsrp=tsrp->next; tsrp; tsrp=tsrp->next)
481 if ( tsrp->server->ipRank != lowestRank)
487 /* if there is only one server with the lowest rank, we are done */
489 lock_ReleaseWrite(&cm_serverLock);
493 picked = rand() % count;
495 lock_ReleaseWrite(&cm_serverLock);
500 while (--picked >= 0)
505 lastTsrp->next = tsrp->next; /* delete random element from list*/
506 tsrp->next = *list; /* insert element at the beginning of list */
508 lock_ReleaseWrite(&cm_serverLock);
511 /* call cm_FreeServer while holding a write lock on cm_serverLock */
512 void cm_FreeServer(cm_server_t* serverp)
514 cm_PutServerNoLock(serverp);
515 if (serverp->refCount == 0)
517 /* we need to check to ensure that all of the connections
518 * for this server have a 0 refCount; otherwise, they will
519 * not be garbage collected
521 cm_GCConnections(serverp); /* connsp */
523 if (!(serverp->flags & CM_SERVERFLAG_PREF_SET)) {
524 lock_FinalizeMutex(&serverp->mx);
525 if ( cm_allServersp == serverp )
526 cm_allServersp = serverp->allNextp;
530 for(tsp = cm_allServersp; tsp->allNextp; tsp=tsp->allNextp) {
531 if ( tsp->allNextp == serverp ) {
532 tsp->allNextp = serverp->allNextp;
542 void cm_FreeServerList(cm_serverRef_t** list)
544 cm_serverRef_t **current = list;
545 cm_serverRef_t **nextp = 0;
546 cm_serverRef_t * next = 0;
548 lock_ObtainWrite(&cm_serverLock);
552 nextp = &(*current)->next;
553 if (--((*current)->refCount) == 0) {
555 cm_FreeServer((*current)->server);
563 lock_ReleaseWrite(&cm_serverLock);