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 <afsconfig.h>
11 #include <afs/param.h>
16 #ifdef AFS_PTHREAD_ENV
17 # include <opr/lock.h>
20 #ifdef IGNORE_SOME_GCC_WARNINGS
21 # pragma GCC diagnostic warning "-Wstrict-prototypes"
24 #include <afs/pthread_glock.h>
28 #include <afs/rxgen_consts.h>
29 #define UBIK_LEGACY_CALLITER
32 short ubik_initializationState; /*!< initial state is zero */
36 * \brief Parse list for clients.
39 ubik_ParseClientList(int argc, char **argv, afs_uint32 * aothers)
48 inServer = 0; /* haven't seen -servers yet */
50 for (i = 1; i < argc; i++) {
51 /* look for -servers argument */
57 /* otherwise this is a new host name */
59 th = gethostbyname(tp);
64 memmove((void *)&temp, (const void *)th->h_addr,
67 if (counter++ >= MAXSERVERS)
71 /* haven't seen a -server yet */
72 if (!strcmp(tp, "-servers")) {
78 /* never saw a -server */
81 if (counter < MAXSERVERS)
82 *aothers++ = 0; /* null terminate if room */
86 #ifdef AFS_PTHREAD_ENV
89 static pthread_once_t random_once = PTHREAD_ONCE_INIT;
90 static int called_afs_random_once;
91 static pthread_key_t random_number_key;
96 opr_Verify(pthread_key_create(&random_number_key, NULL) == 0);
97 called_afs_random_once = 1;
103 * \brief use time and pid to try to get some initial randomness.
105 #define ranstage(x) (x)= (afs_uint32) (3141592621U*((afs_uint32)x)+1)
108 * \brief Random number generator and constants from KnuthV2 2d ed, p170
111 * X = (aX + c) % m \n
112 * m is a power of two \n
114 * a is 0.73m should be 0.01m .. 0.99m \n
115 * c is more or less immaterial. 1 or a is suggested. \n
117 * NB: LOW ORDER BITS are not very random. To get small random numbers,
118 * treat result as <1, with implied binary point, and multiply by
121 * NB: Has to be unsigned, since shifts on signed quantities may preserve
124 * In this case, m == 2^32, the mod operation is implicit. a == pi, which
125 * is used because it has some interesting characteristics (lacks any
126 * interesting bit-patterns).
131 #ifdef AFS_PTHREAD_ENV
134 if (!called_afs_random_once)
135 pthread_once(&random_once, afs_random_once);
137 state = (uintptr_t) pthread_getspecific(random_number_key);
139 static afs_uint32 state = 0;
144 state = time(0) + getpid();
145 for (i = 0; i < 15; i++) {
151 #ifdef AFS_PTHREAD_ENV
152 pthread_setspecific(random_number_key, (const void *)(uintptr_t)state);
159 * \brief Returns int 0..14 using the high bits of a pseudo-random number instead of
160 * the low bits, as the low bits are "less random" than the high ones...
162 * \todo Slight roundoff error exists, an excercise for the reader.
164 * Need to multiply by something with lots of ones in it, so multiply by
165 * 8 or 16 is right out.
168 afs_randomMod15(void)
172 temp = afs_random() >> 4;
173 temp = (temp * 15) >> 28;
181 #define abs(a) ((a) < 0 ? -1*(a) : (a))
183 ubik_ClientInit(struct rx_connection **serverconns,
184 struct ubik_client **aclient)
189 struct ubik_client *tc;
191 initialize_U_error_table();
193 if (*aclient) { /* the application is doing a re-initialization */
194 LOCK_UBIK_CLIENT((*aclient));
195 /* this is an important defensive check */
196 if (!((*aclient)->initializationState)) {
197 UNLOCK_UBIK_CLIENT((*aclient));
198 return UREINITIALIZE;
201 /* release all existing connections */
202 for (tc = *aclient, i = 0; i < MAXSERVERS; i++) {
203 struct rx_connection *rxConn = ubik_GetRPCConn(tc, i);
206 #ifdef AFS_PTHREAD_ENV
207 rx_ReleaseCachedConnection(rxConn);
209 rx_DestroyConnection(rxConn);
212 UNLOCK_UBIK_CLIENT((*aclient));
213 #ifdef AFS_PTHREAD_ENV
214 if (pthread_mutex_destroy(&((*aclient)->cm)))
215 return UMUTEXDESTROY;
218 tc = malloc(sizeof(struct ubik_client));
222 memset((void *)tc, 0, sizeof(*tc));
223 #ifdef AFS_PTHREAD_ENV
224 if (pthread_mutex_init(&(tc->cm), (const pthread_mutexattr_t *)0)) {
229 tc->initializationState = ++ubik_initializationState;
231 /* first count the # of server conns so we can randomize properly */
233 for (i = 0; i < MAXSERVERS; i++) {
234 if (serverconns[i] == (struct rx_connection *)0)
239 /* here count is the # of servers we're actually passed in. Compute
240 * offset, a number between 0..count-1, where we'll start copying from the
241 * client-provided array. */
242 for (i = 0; i < count; i++) {
243 offset = afs_randomMod15() % count;
244 for (j = abs(offset); j < 2 * count; j++) {
245 if (!tc->conns[abs(j % count)]) {
246 tc->conns[abs(j % count)] = serverconns[i];
257 * \brief Destroy an ubik connection.
259 * It calls rx to destroy the component rx connections, then frees the ubik
260 * connection structure.
263 ubik_ClientDestroy(struct ubik_client * aclient)
269 LOCK_UBIK_CLIENT(aclient);
270 for (c = 0; c < MAXSERVERS; c++) {
271 struct rx_connection *rxConn = ubik_GetRPCConn(aclient, c);
274 #ifdef AFS_PTHREAD_ENV
275 rx_ReleaseCachedConnection(rxConn);
277 rx_DestroyConnection(rxConn);
280 aclient->initializationState = 0; /* client in not initialized */
281 UNLOCK_UBIK_CLIENT(aclient);
282 #ifdef AFS_PTHREAD_ENV
283 pthread_mutex_destroy(&(aclient->cm)); /* ignore failure */
290 * \brief So that intermittent failures that cause connections to die
291 * don't kill whole ubik connection, refresh them when the connection is in
294 struct rx_connection *
295 ubik_RefreshConn(struct rx_connection *tc)
300 struct rx_securityClass *sc;
302 struct rx_connection *newTc;
304 host = rx_HostOf(rx_PeerOf(tc));
305 port = rx_PortOf(rx_PeerOf(tc));
306 service = rx_ServiceIdOf(tc);
307 sc = rx_SecurityObjectOf(tc);
308 si = rx_SecurityClassOf(tc);
311 * destroy old one after creating new one so that refCount on security
312 * object cannot reach zero.
314 newTc = rx_NewConnection(host, port, service, sc, si);
315 rx_DestroyConnection(tc);
319 #ifdef AFS_PTHREAD_ENV
321 pthread_once_t ubik_client_once = PTHREAD_ONCE_INIT;
322 pthread_mutex_t ubik_client_mutex;
323 #define LOCK_UCLNT_CACHE do { \
324 opr_Verify(pthread_once(&ubik_client_once, ubik_client_init_mutex) == 0); \
325 MUTEX_ENTER(&ubik_client_mutex); \
327 #define UNLOCK_UCLNT_CACHE MUTEX_EXIT(&ubik_client_mutex)
330 ubik_client_init_mutex(void)
332 MUTEX_INIT(&ubik_client_mutex, "client init", MUTEX_DEFAULT, 0);
337 #define LOCK_UCLNT_CACHE
338 #define UNLOCK_UCLNT_CACHE
343 static int *calls_needsync[SYNCCOUNT]; /* proc calls that need the sync site */
344 static int synccount = 0;
353 * \brief Create an internal version of ubik_CallIter that takes an additional
354 * parameter - to indicate whether the ubik client handle has already
358 CallIter(int (*aproc) (), struct ubik_client *aclient,
359 afs_int32 aflags, int *apos, long p1, long p2, long p3, long p4,
360 long p5, long p6, long p7, long p8, long p9, long p10, long p11,
361 long p12, long p13, long p14, long p15, long p16, int needlock)
364 struct rx_connection *tc;
368 LOCK_UBIK_CLIENT(aclient);
370 origLevel = aclient->initializationState;
374 while (*apos < MAXSERVERS) {
375 /* tc is the next conn to try */
376 tc = aclient->conns[*apos];
380 if (rx_ConnError(tc)) {
381 tc = ubik_RefreshConn(tc);
382 aclient->conns[*apos] = tc;
385 if ((aflags & UPUBIKONLY) && (aclient->states[*apos] & CFLastFailed)) {
386 (*apos)++; /* try another one if this server is down */
388 break; /* this is the desired path */
391 if (*apos >= MAXSERVERS)
395 (*aproc) (tc, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13,
397 if (aclient->initializationState != origLevel)
398 /* somebody did a ubik_ClientInit */
401 /* what should I do in case of UNOQUORUM ? */
403 aclient->states[*apos] |= CFLastFailed; /* network errors */
405 /* either misc ubik code, or misc application code or success. */
406 aclient->states[*apos] &= ~CFLastFailed; /* operation worked */
412 UNLOCK_UBIK_CLIENT(aclient);
418 * \brief This is part of an iterator. It doesn't handle finding sync sites.
421 ubik_CallIter(int (*aproc) (), struct ubik_client *aclient,
422 afs_int32 aflags, int *apos, long p1, long p2,
423 long p3, long p4, long p5, long p6, long p7,
424 long p8, long p9, long p10, long p11, long p12,
425 long p13, long p14, long p15, long p16)
427 return CallIter(aproc, aclient, aflags, apos, p1, p2, p3, p4, p5, p6, p7,
428 p8, p9, p10, p11, p12, p13, p14, p15, p16, NEED_LOCK);
432 * \brief Call this instead of stub and we'll guarantee to find a host that's up.
434 * \todo In the future, we should also put in a protocol to find the sync site.
437 ubik_Call_New(int (*aproc) (), struct ubik_client *aclient,
438 afs_int32 aflags, long p1, long p2, long p3, long p4, long p5,
439 long p6, long p7, long p8, long p9, long p10, long p11,
440 long p12, long p13, long p14, long p15, long p16)
442 afs_int32 code, rcode;
447 LOCK_UBIK_CLIENT(aclient);
450 origLevel = aclient->initializationState;
452 /* Do two passes. First pass only checks servers known running */
453 for (aflags |= UPUBIKONLY, pass = 0; pass < 2;
454 pass++, aflags &= ~UPUBIKONLY) {
458 CallIter(aproc, aclient, aflags, &count, p1, p2, p3, p4, p5,
459 p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16,
461 if (code && (aclient->initializationState != origLevel)) {
464 if (code == UNOSERVERS) {
467 rcode = code; /* remember code from last good call */
469 if ((code >= 0) && (code != UNOQUORUM) && (code != UNOTSYNC)) {
470 UNLOCK_UBIK_CLIENT(aclient);
471 return code; /* success or global error condition */
475 UNLOCK_UBIK_CLIENT(aclient);
480 * Find index of connection to ahost.
482 * @param[in] aclient client structure
483 * @param[in] ahost host to be found (IP address in net-byte order)
485 * @return index on success; -1 otherwise.
488 IndexOf(struct ubik_client *aclient, int ahost)
490 int i, thisHost, index = -1;
493 for (i = 0; i < MAXSERVERS && aclient->conns[i]; i++) {
494 rxp = rx_PeerOf(aclient->conns[i]);
495 thisHost = rx_HostOf(rxp);
499 if (thisHost == ahost) {
508 * call this instead of stub and we'll guarantee to find a host that's up.
510 * \todo In the future, we should also put in a protocol to find the sync site.
513 ubik_Call(int (*aproc) (), struct ubik_client *aclient,
514 afs_int32 aflags, long p1, long p2, long p3, long p4,
515 long p5, long p6, long p7, long p8, long p9, long p10,
516 long p11, long p12, long p13, long p14, long p15, long p16)
518 afs_int32 rcode, code, count;
519 int pass, needsync, inlist, j;
520 struct rx_connection *tc;
524 if (aflags & UBIK_CALL_NEW)
525 return ubik_Call_New(aproc, aclient, aflags, p1, p2, p3, p4,
526 p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15,
531 LOCK_UBIK_CLIENT(aclient);
534 origLevel = aclient->initializationState;
536 inlist = needsync = 0;
539 for (j = 0; ((j < SYNCCOUNT) && calls_needsync[j]); j++) {
540 if (calls_needsync[j] == (int *)aproc) {
541 inlist = needsync = 1;
547 * First pass, we try all servers that are up.
548 * Second pass, we try all servers.
550 for (pass = 0; pass < 2; pass++) { /*p */
551 /* For each entry in our servers list */
552 for (count = 0;; count++) { /*s */
555 /* Need a sync site. Lets try to quickly find it */
556 if (aclient->syncSite) {
558 * Position "count" at the appropriate slot in the client
559 * structure and retry. If we can't find in slot, we'll just
560 * continue through the whole list.
562 code = IndexOf(aclient, aclient->syncSite);
563 aclient->syncSite = 0;
569 tc = aclient->conns[count];
570 if (tc && rx_ConnError(tc)) {
571 aclient->conns[count] = tc = ubik_RefreshConn(tc);
576 if ((pass == 0) && (aclient->states[count] & CFLastFailed)) {
577 continue; /* this guy's down */
581 (*aproc) (tc, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11,
582 p12, p13, p14, p15, p16);
583 if (aclient->initializationState != origLevel) {
584 /* somebody did a ubik_ClientInit */
586 goto restart; /* call failed */
588 goto done; /* call suceeded */
590 if (rcode < 0) { /* network errors */
591 aclient->states[count] |= CFLastFailed; /* Mark serer down */
592 } else if (rcode == UNOTSYNC) {
594 } else if (rcode != UNOQUORUM) {
595 /* either misc ubik code, or misc appl code, or success. */
596 aclient->states[count] &= ~CFLastFailed; /* mark server up */
597 goto done; /* all done */
604 if (!inlist) { /* Remember proc call that needs sync site */
606 calls_needsync[synccount % SYNCCOUNT] = (int *)aproc;
611 if (!rcode) { /* Remember the sync site - cmd successful */
612 rxp = rx_PeerOf(aclient->conns[count]);
613 aclient->syncSite = rx_HostOf(rxp);
616 UNLOCK_UBIK_CLIENT(aclient);
621 ubik_CallRock(struct ubik_client *aclient, afs_int32 aflags,
622 ubik_callrock_func proc, void *rock)
624 afs_int32 rcode, code, _ucount;
626 struct rx_connection *tc;
632 LOCK_UBIK_CLIENT(aclient);
635 origLevel = aclient->initializationState;
640 * First pass, we try all servers that are up.
641 * Second pass, we try all servers.
643 for (pass = 0; pass < 2; pass++) {
644 /* For each entry in our servers list */
645 for (_ucount = 0;; _ucount++) {
646 struct ubik_callrock_info info;
648 /* Need a sync site. Lets try to quickly find it */
649 if (aclient->syncSite) {
651 * Position "_ucount" at the appropriate slot in the client
652 * structure and retry. If we can't find in slot, we'll just
653 * continue through the whole list.
655 code = IndexOf(aclient, aclient->syncSite);
656 aclient->syncSite = 0;
662 tc = aclient->conns[_ucount];
663 if (tc && rx_ConnError(tc)) {
664 aclient->conns[_ucount] = tc = ubik_RefreshConn(tc);
669 if ((pass == 0) && (aclient->states[_ucount] & CFLastFailed)) {
670 continue; /* this guy's down */
673 memset(&info, 0, sizeof(info));
675 rcode = (*proc)(&info, rock);
677 if (aclient->initializationState != origLevel) {
678 /* somebody did a ubik_ClientInit */
680 goto restart; /* call failed */
682 goto done; /* call suceeded */
684 if (rcode < 0) { /* network errors */
685 aclient->states[_ucount] |= CFLastFailed; /* Mark server down */
686 } else if (rcode == UNOTSYNC) {
688 } else if (rcode != UNOQUORUM) {
689 /* either misc ubik code, or misc appl code, or success. */
690 aclient->states[_ucount] &= ~CFLastFailed; /* mark server up*/
691 goto done; /* all done */
698 if (!rcode) { /* Remember the sync site - cmd successful */
699 rxp = rx_PeerOf(aclient->conns[_ucount]);
700 aclient->syncSite = rx_HostOf(rxp);
703 UNLOCK_UBIK_CLIENT(aclient);