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>
28 osi_rwlock_t cm_connLock;
30 long RDRtimeout = CM_CONN_DEFAULTRDRTIMEOUT;
32 afs_int32 cryptall = 0;
34 void cm_PutConn(cm_conn_t *connp)
36 lock_ObtainWrite(&cm_connLock);
37 osi_assert(connp->refCount-- > 0);
38 lock_ReleaseWrite(&cm_connLock);
41 void cm_InitConn(void)
43 static osi_once_t once;
45 if (osi_Once(&once)) {
46 lock_InitializeRWLock(&cm_connLock, "connection global lock");
51 void cm_InitReq(cm_req_t *reqp)
53 memset((char *)reqp, 0, sizeof(cm_req_t));
55 reqp->startTime = GetCurrentTime();
57 gettimeofday(&reqp->startTime, NULL);
62 long cm_GetServerList(struct cm_fid *fidp, struct cm_user *userp,
63 struct cm_req *reqp, cm_serverRef_t **serverspp)
66 cm_volume_t *volp = NULL;
67 cm_serverRef_t *serversp = NULL;
68 cm_cell_t *cellp = NULL;
75 cellp = cm_FindCellByID(fidp->cell);
76 if (!cellp) return CM_ERROR_NOSUCHCELL;
78 code = cm_GetVolumeByID(cellp, fidp->volume, userp, reqp, &volp);
79 if (code) return code;
81 if (fidp->volume == volp->rwID)
82 serversp = volp->rwServersp;
83 else if (fidp->volume == volp->roID)
84 serversp = volp->roServersp;
85 else if (fidp->volume == volp->bkID)
86 serversp = volp->bkServersp;
91 *serverspp = serversp;
96 * Analyze the error return from an RPC. Determine whether or not to retry,
97 * and if we're going to retry, determine whether failover is appropriate,
98 * and whether timed backoff is appropriate.
100 * If the error code is from cm_Conn() or friends, it will be a CM_ERROR code.
101 * Otherwise it will be an RPC code. This may be a UNIX code (e.g. EDQUOT), or
102 * it may be an RX code, or it may be a special code (e.g. VNOVOL), or it may
103 * be a security code (e.g. RXKADEXPIRED).
105 * If the error code is from cm_Conn() or friends, connp will be NULL.
107 * For VLDB calls, fidp will be NULL.
109 * volSyncp and/or cbrp may also be NULL.
111 cm_Analyze(cm_conn_t *connp, cm_user_t *userp, cm_req_t *reqp,
113 AFSVolSync *volSyncp, cm_callbackRequest_t *cbrp, long errorCode)
115 cm_server_t *serverp;
116 cm_serverRef_t *serversp, *tsrp;
121 osi_Log2(afsd_logp, "cm_Analyze connp 0x%x, code %d",
122 (long) connp, errorCode);
124 /* no locking required, since connp->serverp never changes after
126 dead_session = (userp->cellInfop == NULL);
128 serverp = connp->serverp;
130 /* Update callback pointer */
131 if (cbrp && errorCode == 0) cbrp->serverp = connp->serverp;
133 /* If not allowed to retry, don't */
134 if (reqp->flags & CM_REQ_NORETRY)
137 /* if all servers are busy, mark them non-busy and start over */
138 if (errorCode == CM_ERROR_ALLBUSY) {
139 cm_GetServerList(fidp, userp, reqp, &serversp);
140 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
141 if (tsrp->status == busy)
142 tsrp->status = not_busy;
148 /* special codes: VBUSY and VRESTARTING */
149 if (errorCode == VBUSY || errorCode == VRESTARTING) {
150 cm_GetServerList(fidp, userp, reqp, &serversp);
151 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
152 if (tsrp->server == serverp
153 && tsrp->status == not_busy) {
161 /* special codes: missing volumes */
162 if (errorCode == VNOVOL || errorCode == VMOVED || errorCode == VOFFLINE
163 || errorCode == VSALVAGE || errorCode == VNOSERVICE) {
167 /* Back off to allow move to complete */
170 /* Update the volume location and see if it changed */
171 cm_GetServerList(fidp, userp, reqp, &serversp);
172 oldSum = cm_ChecksumServerList(serversp);
173 cm_ForceUpdateVolume(fidp, userp, reqp);
174 cm_GetServerList(fidp, userp, reqp, &serversp);
175 newSum = cm_ChecksumServerList(serversp);
176 same = (oldSum == newSum);
178 /* mark servers as appropriate */
179 for (tsrp = serversp; tsrp; tsrp=tsrp->next) {
180 if (tsrp->server == serverp)
181 tsrp->status = offline;
183 tsrp->status = not_busy;
189 if (errorCode == RX_CALL_TIMEOUT) {
190 /* server took longer than hardDeadTime
191 * don't mark server as down but don't retry
192 * this is to prevent the SMB session from timing out
193 * In addition, we log an event to the event log
199 h = RegisterEventSource(NULL, AFS_DAEMON_EVENT_NAME);
200 sprintf(s, "cm_Analyze: HardDeadTime exceeded.");
202 ReportEvent(h, EVENTLOG_WARNING_TYPE, 0, 1009, NULL,
204 DeregisterEventSource(h);
208 osi_Log0(afsd_logp, "cm_Analyze: hardDeadTime exceeded");
210 else if (errorCode >= -64 && errorCode < 0) {
211 /* mark server as down */
212 lock_ObtainMutex(&serverp->mx);
213 serverp->flags |= CM_SERVERFLAG_DOWN;
214 lock_ReleaseMutex(&serverp->mx);
218 if (errorCode == RXKADEXPIRED && !dead_session) {
219 lock_ObtainMutex(&userp->mx);
220 ucellp = cm_GetUCell(userp, serverp->cellp);
221 if (ucellp->ticketp) {
222 free(ucellp->ticketp);
223 ucellp->ticketp = NULL;
225 ucellp->flags &= ~CM_UCELLFLAG_RXKAD;
227 lock_ReleaseMutex(&userp->mx);
231 if (retry && dead_session)
235 /* drop this on the way out */
239 /* retry until we fail to find a connection */
243 long cm_ConnByMServers(cm_serverRef_t *serversp, cm_user_t *usersp,
244 cm_req_t *reqp, cm_conn_t **connpp)
247 cm_serverRef_t *tsrp;
250 int someBusy = 0, someOffline = 0;
251 long timeUsed, timeLeft, hardTimeLeft;
259 timeUsed = (GetCurrentTime() - reqp->startTime) / 1000;
261 gettimeofday(&now, NULL);
262 timeUsed = sub_time(now, reqp->startTime) / 1000;
265 /* leave 5 seconds margin of safety */
266 timeLeft = RDRtimeout - timeUsed - 5;
267 hardTimeLeft = timeLeft;
269 /* Time enough to do an RPC? */
271 return CM_ERROR_TIMEDOUT;
274 lock_ObtainWrite(&cm_serverLock);
276 for(tsrp = serversp; tsrp; tsrp=tsrp->next) {
279 lock_ReleaseWrite(&cm_serverLock);
280 if (!(tsp->flags & CM_SERVERFLAG_DOWN)) {
281 if (tsrp->status == busy)
283 else if (tsrp->status == offline)
286 code = cm_ConnByServer(tsp, usersp, connpp);
289 /* Set RPC timeout */
290 if (timeLeft > CM_CONN_CONNDEADTIME)
291 timeLeft = CM_CONN_CONNDEADTIME;
293 if (hardTimeLeft > CM_CONN_HARDDEADTIME)
294 hardTimeLeft = CM_CONN_HARDDEADTIME;
296 lock_ObtainMutex(&(*connpp)->mx);
297 rx_SetConnDeadTime((*connpp)->callp,
299 rx_SetConnHardDeadTime((*connpp)->callp,
300 (u_short) hardTimeLeft);
301 lock_ReleaseMutex(&(*connpp)->mx);
305 if (firstError == 0) firstError = code;
308 lock_ObtainWrite(&cm_serverLock);
309 osi_assert(tsp->refCount-- > 0);
312 lock_ReleaseWrite(&cm_serverLock);
313 if (firstError == 0) {
314 if (someBusy) firstError = CM_ERROR_ALLBUSY;
315 else if (someOffline) firstError = CM_ERROR_NOSUCHVOLUME;
316 else firstError = CM_ERROR_TIMEDOUT;
318 osi_Log1(afsd_logp, "cm_ConnByMServers returning %x", firstError);
322 /* called with a held server to GC all bad connections hanging off of the server */
323 void cm_GCConnections(cm_server_t *serverp)
329 lock_ObtainWrite(&cm_connLock);
330 lcpp = &serverp->connsp;
331 for(tcp = *lcpp; tcp; tcp = *lcpp) {
333 if (userp && tcp->refCount == 0 && (userp->vcRefs == 0)) {
334 /* do the deletion of this guy */
335 cm_ReleaseUser(userp);
337 rx_DestroyConnection(tcp->callp);
338 lock_FinalizeMutex(&tcp->mx);
342 /* just advance to the next */
346 lock_ReleaseWrite(&cm_connLock);
349 static void cm_NewRXConnection(cm_conn_t *tcp, cm_ucell_t *ucellp,
350 cm_server_t *serverp)
355 struct rx_securityClass *secObjp;
358 if (serverp->type == CM_SERVER_VLDB) {
363 osi_assert(serverp->type == CM_SERVER_FILE);
367 if (ucellp->flags & CM_UCELLFLAG_RXKAD) {
371 tcp->cryptlevel = rxkad_crypt;
375 secObjp = rxkad_NewClientSecurityObject(level,
376 &ucellp->sessionKey, ucellp->kvno,
377 ucellp->ticketLen, ucellp->ticketp);
382 secObjp = rxnull_NewClientSecurityObject();
384 osi_assert(secObjp != NULL);
385 tcp->callp = rx_NewConnection(serverp->addr.sin_addr.s_addr,
390 rx_SetConnDeadTime(tcp->callp, CM_CONN_CONNDEADTIME);
391 rx_SetConnHardDeadTime(tcp->callp, CM_CONN_HARDDEADTIME);
392 tcp->ucgen = ucellp->gen;
395 long cm_ConnByServer(cm_server_t *serverp, cm_user_t *userp, cm_conn_t **connpp)
400 lock_ObtainMutex(&userp->mx);
401 lock_ObtainWrite(&cm_connLock);
402 for(tcp = serverp->connsp; tcp; tcp=tcp->nextp) {
403 if (tcp->userp == userp) break;
405 /* find ucell structure */
406 ucellp = cm_GetUCell(userp, serverp->cellp);
408 tcp = malloc(sizeof(*tcp));
409 memset(tcp, 0, sizeof(*tcp));
410 tcp->nextp = serverp->connsp;
411 serverp->connsp = tcp;
414 lock_InitializeMutex(&tcp->mx, "cm_conn_t mutex");
415 tcp->serverp = serverp;
416 tcp->cryptlevel = rxkad_clear;
417 cm_NewRXConnection(tcp, ucellp, serverp);
421 if ((tcp->ucgen < ucellp->gen) || (tcp->cryptlevel != cryptall))
423 rx_DestroyConnection(tcp->callp);
424 cm_NewRXConnection(tcp, ucellp, serverp);
428 lock_ReleaseWrite(&cm_connLock);
429 lock_ReleaseMutex(&userp->mx);
431 /* return this pointer to our caller */
432 osi_Log1(afsd_logp, "cm_ConnByServer returning conn 0x%x", (long) tcp);
438 long cm_Conn(struct cm_fid *fidp, struct cm_user *userp, cm_req_t *reqp,
443 cm_serverRef_t *serversp;
445 code = cm_GetServerList(fidp, userp, reqp, &serversp);
451 code = cm_ConnByMServers(serversp, userp, reqp, connpp);