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
19 * afs_FlushActiveVcaches
22 * afs_WriteVCacheDiscon
40 #include <afsconfig.h>
41 #include "afs/param.h"
43 #include "afs/sysincludes.h" /*Standard vendor system headers */
44 #include "afsincludes.h" /*AFS-based standard headers */
45 #include "afs/afs_stats.h"
46 #include "afs/afs_cbqueue.h"
47 #include "afs/afs_osidnlc.h"
49 afs_int32 afs_maxvcount = 0; /* max number of vcache entries */
50 afs_int32 afs_vcount = 0; /* number of vcache in use now */
58 #endif /* AFS_SGI64_ENV */
60 /* Exported variables */
61 afs_rwlock_t afs_xvcdirty; /*Lock: discon vcache dirty list mgmt */
62 afs_rwlock_t afs_xvcache; /*Lock: alloc new stat cache entries */
63 afs_rwlock_t afs_xvreclaim; /*Lock: entries reclaimed, not on free list */
64 afs_lock_t afs_xvcb; /*Lock: fids on which there are callbacks */
65 #if !defined(AFS_LINUX22_ENV)
66 static struct vcache *freeVCList; /*Free list for stat cache entries */
67 struct vcache *ReclaimedVCList; /*Reclaimed list for stat entries */
68 static struct vcache *Initial_freeVCList; /*Initial list for above */
70 struct afs_q VLRU; /*vcache LRU */
71 afs_int32 vcachegen = 0;
72 unsigned int afs_paniconwarn = 0;
73 struct vcache *afs_vhashT[VCSIZE];
74 struct afs_q afs_vhashTV[VCSIZE];
75 static struct afs_cbr *afs_cbrHashT[CBRSIZE];
76 afs_int32 afs_bulkStatsLost;
77 int afs_norefpanic = 0;
80 /* Disk backed vcache definitions
81 * Both protected by xvcache */
82 static int afs_nextVcacheSlot = 0;
83 static struct afs_slotlist *afs_freeSlotList = NULL;
85 /* Forward declarations */
86 static afs_int32 afs_QueueVCB(struct vcache *avc, int *slept);
89 * Generate an index into the hash table for a given Fid.
91 * \return The hash value.
94 afs_HashCBRFid(struct AFSFid *fid)
96 return (fid->Volume + fid->Vnode + fid->Unique) % CBRSIZE;
100 * Insert a CBR entry into the hash table.
101 * Must be called with afs_xvcb held.
106 afs_InsertHashCBR(struct afs_cbr *cbr)
108 int slot = afs_HashCBRFid(&cbr->fid);
110 cbr->hash_next = afs_cbrHashT[slot];
111 if (afs_cbrHashT[slot])
112 afs_cbrHashT[slot]->hash_pprev = &cbr->hash_next;
114 cbr->hash_pprev = &afs_cbrHashT[slot];
115 afs_cbrHashT[slot] = cbr;
120 * Flush the given vcache entry.
123 * afs_xvcache lock must be held for writing upon entry to
124 * prevent people from changing the vrefCount field, and to
125 * protect the lruq and hnext fields.
126 * LOCK: afs_FlushVCache afs_xvcache W
127 * REFCNT: vcache ref count must be zero on entry except for osf1
128 * RACE: lock is dropped and reobtained, permitting race in caller
130 * \param avc Pointer to vcache entry to flush.
131 * \param slept Pointer to int to set 1 if we sleep/drop locks, 0 if we don't.
135 afs_FlushVCache(struct vcache *avc, int *slept)
136 { /*afs_FlushVCache */
139 struct vcache **uvc, *wvc;
142 AFS_STATCNT(afs_FlushVCache);
143 afs_Trace2(afs_iclSetp, CM_TRACE_FLUSHV, ICL_TYPE_POINTER, avc,
144 ICL_TYPE_INT32, avc->f.states);
146 code = osi_VM_FlushVCache(avc, slept);
150 if (avc->f.states & CVFlushed) {
154 #if !defined(AFS_LINUX22_ENV)
155 if (avc->nextfree || !avc->vlruq.prev || !avc->vlruq.next) { /* qv afs.h */
156 refpanic("LRU vs. Free inconsistency");
159 avc->f.states |= CVFlushed;
160 /* pull the entry out of the lruq and put it on the free list */
161 QRemove(&avc->vlruq);
163 /* keep track of # of files that we bulk stat'd, but never used
164 * before they got recycled.
166 if (avc->f.states & CBulkStat)
169 /* remove entry from the hash chain */
170 i = VCHash(&avc->f.fid);
171 uvc = &afs_vhashT[i];
172 for (wvc = *uvc; wvc; uvc = &wvc->hnext, wvc = *uvc) {
175 avc->hnext = (struct vcache *)NULL;
180 /* remove entry from the volume hash table */
181 QRemove(&avc->vhashq);
184 osi_FreeSmallSpace(avc->mvid);
185 avc->mvid = (struct VenusFid *)0;
187 afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1);
188 avc->linkData = NULL;
190 #if defined(AFS_XBSD_ENV) || defined(AFS_DARWIN_ENV)
191 /* OK, there are no internal vrefCounts, so there shouldn't
192 * be any more refs here. */
194 #ifdef AFS_DARWIN80_ENV
195 vnode_clearfsnode(AFSTOV(avc));
196 vnode_removefsref(AFSTOV(avc));
198 avc->v->v_data = NULL; /* remove from vnode */
200 AFSTOV(avc) = NULL; /* also drop the ptr to vnode */
203 #ifdef AFS_SUN510_ENV
204 /* As we use private vnodes, cleanup is up to us */
205 vn_reinit(AFSTOV(avc));
207 afs_FreeAllAxs(&(avc->Access));
208 if (!afs_shuttingdown)
209 afs_QueueVCB(avc, slept);
210 ObtainWriteLock(&afs_xcbhash, 460);
211 afs_DequeueCallback(avc); /* remove it from queued callbacks list */
212 avc->f.states &= ~(CStatd | CUnique);
213 ReleaseWriteLock(&afs_xcbhash);
214 if ((avc->f.states & CForeign) || (avc->f.fid.Fid.Vnode & 1))
215 osi_dnlc_purgedp(avc); /* if it (could be) a directory */
217 osi_dnlc_purgevp(avc);
220 * Next, keep track of which vnodes we've deleted for create's
221 * optimistic synchronization algorithm
224 if (avc->f.fid.Fid.Vnode & 1)
230 #if !defined(AFS_LINUX22_ENV)
231 /* put the entry in the free list */
232 avc->nextfree = freeVCList;
234 if (avc->vlruq.prev || avc->vlruq.next) {
235 refpanic("LRU vs. Free inconsistency");
237 avc->f.states |= CVFlushed;
239 /* This should put it back on the vnode free list since usecount is 1 */
241 if (VREFCOUNT_GT(avc,0)) {
242 AFS_RELE(AFSTOV(avc));
243 afs_stats_cmperf.vcacheXAllocs--;
245 if (afs_norefpanic) {
246 afs_warn("flush vc refcnt < 1");
249 osi_Panic("flush vc refcnt < 1");
251 #endif /* AFS_LINUX22_ENV */
256 } /*afs_FlushVCache */
260 * The core of the inactive vnode op for all but IRIX.
266 afs_InactiveVCache(struct vcache *avc, afs_ucred_t *acred)
268 AFS_STATCNT(afs_inactive);
269 if (avc->f.states & CDirty) {
270 /* we can't keep trying to push back dirty data forever. Give up. */
271 afs_InvalidateAllSegments(avc); /* turns off dirty bit */
273 avc->f.states &= ~CMAPPED; /* mainly used by SunOS 4.0.x */
274 avc->f.states &= ~CDirty; /* Turn it off */
275 if (avc->f.states & CUnlinked) {
276 if (CheckLock(&afs_xvcache) || CheckLock(&afs_xdcache)) {
277 avc->f.states |= CUnlinkedDel;
280 afs_remunlink(avc, 1); /* ignore any return code */
287 * Allocate a callback return structure from the
288 * free list and return it.
290 * Environment: The alloc and free routines are both called with the afs_xvcb lock
291 * held, so we don't have to worry about blocking in osi_Alloc.
293 * \return The allocated afs_cbr.
295 static struct afs_cbr *afs_cbrSpace = 0;
296 /* if alloc limit below changes, fix me! */
297 static struct afs_cbr *afs_cbrHeads[16];
304 while (!afs_cbrSpace) {
305 if (afs_stats_cmperf.CallBackAlloced >= sizeof(afs_cbrHeads)/sizeof(afs_cbrHeads[0])) {
306 /* don't allocate more than 16 * AFS_NCBRS for now */
308 afs_stats_cmperf.CallBackFlushes++;
311 tsp = afs_osi_Alloc(AFS_NCBRS * sizeof(struct afs_cbr));
312 osi_Assert(tsp != NULL);
313 for (i = 0; i < AFS_NCBRS - 1; i++) {
314 tsp[i].next = &tsp[i + 1];
316 tsp[AFS_NCBRS - 1].next = 0;
318 afs_cbrHeads[afs_stats_cmperf.CallBackAlloced] = tsp;
319 afs_stats_cmperf.CallBackAlloced++;
323 afs_cbrSpace = tsp->next;
328 * Free a callback return structure, removing it from all lists.
330 * Environment: the xvcb lock is held over these calls.
332 * \param asp The address of the structure to free.
337 afs_FreeCBR(struct afs_cbr *asp)
339 *(asp->pprev) = asp->next;
341 asp->next->pprev = asp->pprev;
343 *(asp->hash_pprev) = asp->hash_next;
345 asp->hash_next->hash_pprev = asp->hash_pprev;
347 asp->next = afs_cbrSpace;
353 FlushAllVCBs(struct rx_connection **rxconns, int nconns, int nservers,
354 struct afs_conn **conns, struct srvAddr **addrs)
359 results = afs_osi_Alloc(nservers * sizeof (afs_int32));
360 osi_Assert(results != NULL);
363 multi_Rx(rxconns,nconns)
365 multi_RXAFS_GiveUpAllCallBacks();
366 results[multi_i] = multi_error;
371 * Freeing the CBR will unlink it from the server's CBR list
372 * do it here, not in the loop, because a dynamic CBR will call
373 * into the memory management routines.
375 for ( i = 0 ; i < nconns ; i++ ) {
376 if (results[i] == 0) {
377 /* Unchain all of them */
378 while (addrs[i]->server->cbrs)
379 afs_FreeCBR(addrs[i]->server->cbrs);
382 afs_osi_Free(results, nservers * sizeof(afs_int32));
386 * Flush all queued callbacks to all servers.
388 * Environment: holds xvcb lock over RPC to guard against race conditions
389 * when a new callback is granted for the same file later on.
391 * \return 0 for success.
394 afs_FlushVCBs(afs_int32 lockit)
396 struct AFSFid *tfids;
397 struct AFSCallBack callBacks[1];
398 struct AFSCBFids fidArray;
399 struct AFSCBs cbArray;
401 struct afs_cbr *tcbrp;
405 struct vrequest treq;
407 int safety1, safety2, safety3;
410 if (AFS_IS_DISCONNECTED)
413 if ((code = afs_InitReq(&treq, afs_osi_credp)))
415 treq.flags |= O_NONBLOCK;
416 tfids = afs_osi_Alloc(sizeof(struct AFSFid) * AFS_MAXCBRSCALL);
417 osi_Assert(tfids != NULL);
420 ObtainWriteLock(&afs_xvcb, 273);
423 * First, attempt a multi across everything, all addresses
424 * for all servers we know of.
428 afs_LoopServers(AFS_LS_ALL, NULL, 0, FlushAllVCBs, NULL);
430 ObtainReadLock(&afs_xserver);
431 for (i = 0; i < NSERVERS; i++) {
432 for (safety1 = 0, tsp = afs_servers[i];
433 tsp && safety1 < afs_totalServers + 10;
434 tsp = tsp->next, safety1++) {
436 if (tsp->cbrs == (struct afs_cbr *)0)
439 /* otherwise, grab a block of AFS_MAXCBRSCALL from the list
440 * and make an RPC, over and over again.
442 tcount = 0; /* number found so far */
443 for (safety2 = 0; safety2 < afs_cacheStats; safety2++) {
444 if (tcount >= AFS_MAXCBRSCALL || !tsp->cbrs) {
445 struct rx_connection *rxconn;
446 /* if buffer is full, or we've queued all we're going
447 * to from this server, we should flush out the
450 fidArray.AFSCBFids_len = tcount;
451 fidArray.AFSCBFids_val = (struct AFSFid *)tfids;
452 cbArray.AFSCBs_len = 1;
453 cbArray.AFSCBs_val = callBacks;
454 memset(&callBacks[0], 0, sizeof(callBacks[0]));
455 callBacks[0].CallBackType = CB_EXCLUSIVE;
456 for (safety3 = 0; safety3 < AFS_MAXHOSTS * 2; safety3++) {
457 tc = afs_ConnByHost(tsp, tsp->cell->fsport,
458 tsp->cell->cellNum, &treq, 0,
459 SHARED_LOCK, &rxconn);
462 (AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS);
465 RXAFS_GiveUpCallBacks(rxconn, &fidArray,
472 (tc, rxconn, code, 0, &treq,
473 AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS, SHARED_LOCK,
478 /* ignore return code, since callbacks may have
479 * been returned anyway, we shouldn't leave them
480 * around to be returned again.
482 * Next, see if we are done with this server, and if so,
483 * break to deal with the next one.
489 /* if to flush full buffer */
490 /* if we make it here, we have an entry at the head of cbrs,
491 * which we should copy to the file ID array and then free.
494 tfids[tcount++] = tcbrp->fid;
496 /* Freeing the CBR will unlink it from the server's CBR list */
498 } /* while loop for this one server */
499 if (safety2 > afs_cacheStats) {
500 afs_warn("possible internal error afs_flushVCBs (%d)\n",
503 } /* for loop for this hash chain */
504 } /* loop through all hash chains */
505 if (safety1 > afs_totalServers + 2) {
507 ("AFS internal error (afs_flushVCBs) (%d > %d), continuing...\n",
508 safety1, afs_totalServers + 2);
510 osi_Panic("afs_flushVCBS safety1");
513 ReleaseReadLock(&afs_xserver);
515 ReleaseWriteLock(&afs_xvcb);
516 afs_osi_Free(tfids, sizeof(struct AFSFid) * AFS_MAXCBRSCALL);
521 * Queue a callback on the given fid.
524 * Locks the xvcb lock.
525 * Called when the xvcache lock is already held.
526 * RACE: afs_xvcache may be dropped and reacquired
528 * \param avc vcache entry
529 * \param slep Set to 1 if we dropped afs_xvcache
530 * \return 1 if queued, 0 otherwise
534 afs_QueueVCB(struct vcache *avc, int *slept)
538 struct afs_cbr *tcbp;
541 AFS_STATCNT(afs_QueueVCB);
543 ObtainWriteLock(&afs_xvcb, 274);
545 /* we can't really give back callbacks on RO files, since the
546 * server only tracks them on a per-volume basis, and we don't
547 * know whether we still have some other files from the same
549 if (!((avc->f.states & CRO) == 0 && avc->callback)) {
553 /* The callback is really just a struct server ptr. */
554 tsp = (struct server *)(avc->callback);
557 /* If we don't have CBR space, AllocCBR may block or hit the net for
558 * clearing up CBRs. Hitting the net may involve a fileserver
559 * needing to contact us, so we must drop xvcache so we don't block
560 * those requests from going through. */
561 reacquire = *slept = 1;
562 ReleaseWriteLock(&afs_xvcache);
565 /* we now have a pointer to the server, so we just allocate
566 * a queue entry and queue it.
568 tcbp = afs_AllocCBR();
569 tcbp->fid = avc->f.fid.Fid;
571 tcbp->next = tsp->cbrs;
573 tsp->cbrs->pprev = &tcbp->next;
576 tcbp->pprev = &tsp->cbrs;
578 afs_InsertHashCBR(tcbp);
582 /* now release locks and return */
583 ReleaseWriteLock(&afs_xvcb);
586 /* make sure this is after dropping xvcb, for locking order */
587 ObtainWriteLock(&afs_xvcache, 279);
594 * Remove a queued callback for a given Fid.
597 * Locks xvcb and xserver locks.
598 * Typically called with xdcache, xvcache and/or individual vcache
601 * \param afid The fid we want cleansed of queued callbacks.
606 afs_RemoveVCB(struct VenusFid *afid)
609 struct afs_cbr *cbr, *ncbr;
611 AFS_STATCNT(afs_RemoveVCB);
612 ObtainWriteLock(&afs_xvcb, 275);
614 slot = afs_HashCBRFid(&afid->Fid);
615 ncbr = afs_cbrHashT[slot];
619 ncbr = cbr->hash_next;
621 if (afid->Fid.Volume == cbr->fid.Volume &&
622 afid->Fid.Vnode == cbr->fid.Vnode &&
623 afid->Fid.Unique == cbr->fid.Unique) {
628 ReleaseWriteLock(&afs_xvcb);
632 afs_FlushReclaimedVcaches(void)
634 #if !defined(AFS_LINUX22_ENV)
637 struct vcache *tmpReclaimedVCList = NULL;
639 ObtainWriteLock(&afs_xvreclaim, 76);
640 while (ReclaimedVCList) {
641 tvc = ReclaimedVCList; /* take from free list */
642 ReclaimedVCList = tvc->nextfree;
643 tvc->nextfree = NULL;
644 code = afs_FlushVCache(tvc, &fv_slept);
646 /* Ok, so, if we got code != 0, uh, wtf do we do? */
647 /* Probably, build a temporary list and then put all back when we
648 get to the end of the list */
649 /* This is actually really crappy, but we need to not leak these.
650 We probably need a way to be smarter about this. */
651 tvc->nextfree = tmpReclaimedVCList;
652 tmpReclaimedVCList = tvc;
653 /* printf("Reclaim list flush %lx failed: %d\n", (unsigned long) tvc, code); */
655 if (tvc->f.states & (CVInit
656 #ifdef AFS_DARWIN80_ENV
660 tvc->f.states &= ~(CVInit
661 #ifdef AFS_DARWIN80_ENV
665 afs_osi_Wakeup(&tvc->f.states);
668 if (tmpReclaimedVCList)
669 ReclaimedVCList = tmpReclaimedVCList;
671 ReleaseWriteLock(&afs_xvreclaim);
676 afs_PostPopulateVCache(struct vcache *avc, struct VenusFid *afid, int seq)
679 * The proper value for mvstat (for root fids) is setup by the caller.
682 if (afid->Fid.Vnode == 1 && afid->Fid.Unique == 1)
685 if (afs_globalVFS == 0)
686 osi_Panic("afs globalvfs");
688 osi_PostPopulateVCache(avc);
691 osi_dnlc_purgedp(avc); /* this may be overkill */
692 memset(&(avc->callsort), 0, sizeof(struct afs_q));
694 avc->f.states &=~ CVInit;
696 avc->f.states |= CBulkFetching;
697 avc->f.m.Length = seq;
699 afs_osi_Wakeup(&avc->f.states);
703 afs_ShakeLooseVCaches(afs_int32 anumber)
707 struct afs_q *tq, *uq;
708 int fv_slept, defersleep = 0;
709 afs_int32 target = anumber;
713 for (tq = VLRU.prev; tq != &VLRU && anumber > 0; tq = uq) {
716 if (tvc->f.states & CVFlushed) {
717 refpanic("CVFlushed on VLRU");
718 /* In the other path, this was 2 * afs_cacheStats */
719 } else if (!afsd_dynamic_vcaches && i++ > afs_maxvcount) {
720 refpanic("Exceeded pool of AFS vnodes(VLRU cycle?)");
721 } else if (QNext(uq) != tq) {
722 refpanic("VLRU inconsistent");
723 } else if (tvc->f.states & CVInit) {
728 if (osi_TryEvictVCache(tvc, &fv_slept, defersleep))
736 continue; /* start over - may have raced. */
739 if (anumber && !defersleep) {
747 if (!afsd_dynamic_vcaches && anumber == target) {
748 afs_warn("afs_ShakeLooseVCaches: warning none freed, using %d of %d\n",
749 afs_vcount, afs_maxvcount);
755 /* Alloc new vnode. */
757 static struct vcache *
758 afs_AllocVCache(void)
762 tvc = osi_NewVnode();
767 if (afsd_dynamic_vcaches && afs_maxvcount < afs_vcount) {
768 afs_maxvcount = afs_vcount;
769 /*printf("peak vnodes: %d\n", afs_maxvcount);*/
772 afs_stats_cmperf.vcacheXAllocs++; /* count in case we have a leak */
774 /* If we create a new inode, we either give it a new slot number,
775 * or if one's available, use a slot number from the slot free list
777 if (afs_freeSlotList != NULL) {
778 struct afs_slotlist *tmp;
780 tvc->diskSlot = afs_freeSlotList->slot;
781 tmp = afs_freeSlotList;
782 afs_freeSlotList = tmp->next;
783 afs_osi_Free(tmp, sizeof(struct afs_slotlist));
785 tvc->diskSlot = afs_nextVcacheSlot++;
791 /* Pre populate a newly allocated vcache. On platforms where the actual
792 * vnode is attached to the vcache, this function is called before attachment,
793 * therefore it cannot perform any actions on the vnode itself */
796 afs_PrePopulateVCache(struct vcache *avc, struct VenusFid *afid,
797 struct server *serverp) {
800 slot = avc->diskSlot;
802 osi_PrePopulateVCache(avc);
804 avc->diskSlot = slot;
805 QZero(&avc->metadirty);
807 AFS_RWLOCK_INIT(&avc->lock, "vcache lock");
810 avc->linkData = NULL;
813 avc->execsOrWriters = 0;
815 avc->f.states = CVInit;
816 avc->last_looker = 0;
818 avc->asynchrony = -1;
822 avc->f.truncPos = AFS_NOTRUNC; /* don't truncate until we need to */
823 hzero(avc->f.m.DataVersion); /* in case we copy it into flushDV */
825 avc->callback = serverp; /* to minimize chance that clear
828 #if defined(AFS_CACHE_BYPASS)
829 avc->cachingStates = 0;
830 avc->cachingTransitions = 0;
835 afs_FlushAllVCaches(void)
838 struct vcache *tvc, *nvc;
840 ObtainWriteLock(&afs_xvcache, 867);
843 for (i = 0; i < VCSIZE; i++) {
844 for (tvc = afs_vhashT[i]; tvc; tvc = nvc) {
848 if (afs_FlushVCache(tvc, &slept)) {
849 afs_warn("Failed to flush vcache 0x%lx\n", (unsigned long)(uintptr_t)tvc);
858 ReleaseWriteLock(&afs_xvcache);
862 * This routine is responsible for allocating a new cache entry
863 * from the free list. It formats the cache entry and inserts it
864 * into the appropriate hash tables. It must be called with
865 * afs_xvcache write-locked so as to prevent several processes from
866 * trying to create a new cache entry simultaneously.
868 * LOCK: afs_NewVCache afs_xvcache W
870 * \param afid The file id of the file whose cache entry is being created.
872 * \return The new vcache struct.
875 static_inline struct vcache *
876 afs_NewVCache_int(struct VenusFid *afid, struct server *serverp, int seq)
880 afs_int32 anumber = VCACHE_FREE;
882 AFS_STATCNT(afs_NewVCache);
884 afs_FlushReclaimedVcaches();
886 #if defined(AFS_LINUX22_ENV)
887 if(!afsd_dynamic_vcaches && afs_vcount >= afs_maxvcount) {
888 afs_ShakeLooseVCaches(anumber);
889 if (afs_vcount >= afs_maxvcount) {
890 afs_warn("afs_NewVCache - none freed\n");
894 tvc = afs_AllocVCache();
895 #else /* AFS_LINUX22_ENV */
896 /* pull out a free cache entry */
898 afs_ShakeLooseVCaches(anumber);
902 tvc = afs_AllocVCache();
904 tvc = freeVCList; /* take from free list */
905 freeVCList = tvc->nextfree;
906 tvc->nextfree = NULL;
907 afs_vcount++; /* balanced by FlushVCache */
908 } /* end of if (!freeVCList) */
910 #endif /* AFS_LINUX22_ENV */
912 #if defined(AFS_XBSD_ENV) || defined(AFS_DARWIN_ENV)
914 panic("afs_NewVCache(): free vcache with vnode attached");
917 /* Populate the vcache with as much as we can. */
918 afs_PrePopulateVCache(tvc, afid, serverp);
920 /* Thread the vcache onto the VLRU */
925 tvc->hnext = afs_vhashT[i];
927 QAdd(&afs_vhashTV[j], &tvc->vhashq);
929 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
930 refpanic("NewVCache VLRU inconsistent");
932 QAdd(&VLRU, &tvc->vlruq); /* put in lruq */
933 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
934 refpanic("NewVCache VLRU inconsistent2");
936 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
937 refpanic("NewVCache VLRU inconsistent3");
939 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
940 refpanic("NewVCache VLRU inconsistent4");
944 /* it should now be safe to drop the xvcache lock - so attach an inode
945 * to this vcache, where necessary */
946 osi_AttachVnode(tvc, seq);
948 /* Get a reference count to hold this vcache for the VLRUQ. Note that
949 * we have to do this after attaching the vnode, because the reference
950 * count may be held in the vnode itself */
952 #if defined(AFS_LINUX22_ENV)
953 /* Hold it for the LRU (should make count 2) */
955 #elif !(defined (AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV))
956 VREFCOUNT_SET(tvc, 1); /* us */
959 #if defined (AFS_FBSD_ENV)
960 if (tvc->f.states & CVInit)
962 afs_PostPopulateVCache(tvc, afid, seq);
969 afs_NewVCache(struct VenusFid *afid, struct server *serverp)
971 return afs_NewVCache_int(afid, serverp, 0);
975 afs_NewBulkVCache(struct VenusFid *afid, struct server *serverp, int seq)
977 return afs_NewVCache_int(afid, serverp, seq);
983 * LOCK: afs_FlushActiveVcaches afs_xvcache N
985 * \param doflocks : Do we handle flocks?
988 afs_FlushActiveVcaches(afs_int32 doflocks)
994 afs_ucred_t *cred = NULL;
995 struct vrequest treq, ureq;
996 struct AFSVolSync tsync;
999 AFS_STATCNT(afs_FlushActiveVcaches);
1000 ObtainReadLock(&afs_xvcache);
1001 for (i = 0; i < VCSIZE; i++) {
1002 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
1003 if (tvc->f.states & CVInit) continue;
1004 #ifdef AFS_DARWIN80_ENV
1005 if (tvc->f.states & CDeadVnode &&
1006 (tvc->f.states & (CCore|CUnlinkedDel) ||
1007 tvc->flockCount)) panic("Dead vnode has core/unlinkedel/flock");
1009 if (doflocks && tvc->flockCount != 0) {
1010 struct rx_connection *rxconn;
1011 /* if this entry has an flock, send a keep-alive call out */
1013 ReleaseReadLock(&afs_xvcache);
1014 ObtainWriteLock(&tvc->lock, 51);
1016 afs_InitReq(&treq, afs_osi_credp);
1017 treq.flags |= O_NONBLOCK;
1019 tc = afs_Conn(&tvc->f.fid, &treq, SHARED_LOCK, &rxconn);
1021 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_EXTENDLOCK);
1024 RXAFS_ExtendLock(rxconn,
1025 (struct AFSFid *)&tvc->f.fid.Fid,
1031 } while (afs_Analyze
1032 (tc, rxconn, code, &tvc->f.fid, &treq,
1033 AFS_STATS_FS_RPCIDX_EXTENDLOCK, SHARED_LOCK, NULL));
1035 ReleaseWriteLock(&tvc->lock);
1036 #ifdef AFS_DARWIN80_ENV
1038 ObtainReadLock(&afs_xvcache);
1040 ObtainReadLock(&afs_xvcache);
1045 if ((tvc->f.states & CCore) || (tvc->f.states & CUnlinkedDel)) {
1047 * Don't let it evaporate in case someone else is in
1048 * this code. Also, drop the afs_xvcache lock while
1049 * getting vcache locks.
1052 ReleaseReadLock(&afs_xvcache);
1053 #ifdef AFS_BOZONLOCK_ENV
1054 afs_BozonLock(&tvc->pvnLock, tvc);
1056 #if defined(AFS_SGI_ENV)
1058 * That's because if we come in via the CUnlinkedDel bit state path we'll be have 0 refcnt
1060 osi_Assert(VREFCOUNT_GT(tvc,0));
1061 AFS_RWLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1063 ObtainWriteLock(&tvc->lock, 52);
1064 if (tvc->f.states & CCore) {
1065 tvc->f.states &= ~CCore;
1066 /* XXXX Find better place-holder for cred XXXX */
1067 cred = (afs_ucred_t *)tvc->linkData;
1068 tvc->linkData = NULL; /* XXX */
1069 afs_InitReq(&ureq, cred);
1070 afs_Trace2(afs_iclSetp, CM_TRACE_ACTCCORE,
1071 ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32,
1072 tvc->execsOrWriters);
1073 code = afs_StoreOnLastReference(tvc, &ureq);
1074 ReleaseWriteLock(&tvc->lock);
1075 #ifdef AFS_BOZONLOCK_ENV
1076 afs_BozonUnlock(&tvc->pvnLock, tvc);
1078 hzero(tvc->flushDV);
1081 if (code && code != VNOVNODE) {
1082 afs_StoreWarn(code, tvc->f.fid.Fid.Volume,
1083 /* /dev/console */ 1);
1085 } else if (tvc->f.states & CUnlinkedDel) {
1089 ReleaseWriteLock(&tvc->lock);
1090 #ifdef AFS_BOZONLOCK_ENV
1091 afs_BozonUnlock(&tvc->pvnLock, tvc);
1093 #if defined(AFS_SGI_ENV)
1094 AFS_RWUNLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1096 afs_remunlink(tvc, 0);
1097 #if defined(AFS_SGI_ENV)
1098 AFS_RWLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1101 /* lost (or won, perhaps) the race condition */
1102 ReleaseWriteLock(&tvc->lock);
1103 #ifdef AFS_BOZONLOCK_ENV
1104 afs_BozonUnlock(&tvc->pvnLock, tvc);
1107 #if defined(AFS_SGI_ENV)
1108 AFS_RWUNLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1110 #ifdef AFS_DARWIN80_ENV
1113 AFS_RELE(AFSTOV(tvc));
1114 /* Matches write code setting CCore flag */
1117 ObtainReadLock(&afs_xvcache);
1119 ObtainReadLock(&afs_xvcache);
1122 AFS_RELE(AFSTOV(tvc));
1123 /* Matches write code setting CCore flag */
1130 ReleaseReadLock(&afs_xvcache);
1136 * Make sure a cache entry is up-to-date status-wise.
1138 * NOTE: everywhere that calls this can potentially be sped up
1139 * by checking CStatd first, and avoiding doing the InitReq
1140 * if this is up-to-date.
1142 * Anymore, the only places that call this KNOW already that the
1143 * vcache is not up-to-date, so we don't screw around.
1145 * \param avc : Ptr to vcache entry to verify.
1151 * Make sure a cache entry is up-to-date status-wise.
1153 * NOTE: everywhere that calls this can potentially be sped up
1154 * by checking CStatd first, and avoiding doing the InitReq
1155 * if this is up-to-date.
1157 * Anymore, the only places that call this KNOW already that the
1158 * vcache is not up-to-date, so we don't screw around.
1160 * \param avc Pointer to vcache entry to verify.
1163 * \return 0 for success or other error codes.
1166 afs_VerifyVCache2(struct vcache *avc, struct vrequest *areq)
1170 AFS_STATCNT(afs_VerifyVCache);
1172 /* otherwise we must fetch the status info */
1174 ObtainWriteLock(&avc->lock, 53);
1175 if (avc->f.states & CStatd) {
1176 ReleaseWriteLock(&avc->lock);
1179 ObtainWriteLock(&afs_xcbhash, 461);
1180 avc->f.states &= ~(CStatd | CUnique);
1181 avc->callback = NULL;
1182 afs_DequeueCallback(avc);
1183 ReleaseWriteLock(&afs_xcbhash);
1184 ReleaseWriteLock(&avc->lock);
1186 /* since we've been called back, or the callback has expired,
1187 * it's possible that the contents of this directory, or this
1188 * file's name have changed, thus invalidating the dnlc contents.
1190 if ((avc->f.states & CForeign) || (avc->f.fid.Fid.Vnode & 1))
1191 osi_dnlc_purgedp(avc);
1193 osi_dnlc_purgevp(avc);
1195 /* fetch the status info */
1196 tvc = afs_GetVCache(&avc->f.fid, areq, NULL, avc);
1199 /* Put it back; caller has already incremented vrefCount */
1203 } /*afs_VerifyVCache */
1207 * Simple copy of stat info into cache.
1209 * Callers:as of 1992-04-29, only called by WriteVCache
1211 * \param avc Ptr to vcache entry involved.
1212 * \param astat Ptr to stat info to copy.
1216 afs_SimpleVStat(struct vcache *avc,
1217 struct AFSFetchStatus *astat, struct vrequest *areq)
1220 AFS_STATCNT(afs_SimpleVStat);
1222 #ifdef AFS_64BIT_CLIENT
1223 FillInt64(length, astat->Length_hi, astat->Length);
1224 #else /* AFS_64BIT_CLIENT */
1225 length = astat->Length;
1226 #endif /* AFS_64BIT_CLIENT */
1228 #if defined(AFS_SGI_ENV)
1229 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)
1230 && !AFS_VN_MAPPED((vnode_t *) avc)) {
1231 osi_Assert((valusema(&avc->vc_rwlock) <= 0)
1232 && (OSI_GET_LOCKID() == avc->vc_rwlockid));
1233 if (length < avc->f.m.Length) {
1234 vnode_t *vp = (vnode_t *) avc;
1236 osi_Assert(WriteLocked(&avc->lock));
1237 ReleaseWriteLock(&avc->lock);
1239 PTOSSVP(vp, (off_t) length, (off_t) MAXLONG);
1241 ObtainWriteLock(&avc->lock, 67);
1246 if (!afs_DirtyPages(avc)) {
1247 /* if actively writing the file, don't fetch over this value */
1248 afs_Trace3(afs_iclSetp, CM_TRACE_SIMPLEVSTAT, ICL_TYPE_POINTER, avc,
1249 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length),
1250 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length));
1251 avc->f.m.Length = length;
1252 avc->f.m.Date = astat->ClientModTime;
1254 avc->f.m.Owner = astat->Owner;
1255 avc->f.m.Group = astat->Group;
1256 avc->f.m.Mode = astat->UnixModeBits;
1257 if (vType(avc) == VREG) {
1258 avc->f.m.Mode |= S_IFREG;
1259 } else if (vType(avc) == VDIR) {
1260 avc->f.m.Mode |= S_IFDIR;
1261 } else if (vType(avc) == VLNK) {
1262 avc->f.m.Mode |= S_IFLNK;
1263 if ((avc->f.m.Mode & 0111) == 0)
1266 if (avc->f.states & CForeign) {
1267 struct axscache *ac;
1268 avc->f.anyAccess = astat->AnonymousAccess;
1270 if ((astat->CallerAccess & ~astat->AnonymousAccess))
1272 * Caller has at least one bit not covered by anonymous, and
1273 * thus may have interesting rights.
1275 * HOWEVER, this is a really bad idea, because any access query
1276 * for bits which aren't covered by anonymous, on behalf of a user
1277 * who doesn't have any special rights, will result in an answer of
1278 * the form "I don't know, lets make a FetchStatus RPC and find out!"
1279 * It's an especially bad idea under Ultrix, since (due to the lack of
1280 * a proper access() call) it must perform several afs_access() calls
1281 * in order to create magic mode bits that vary according to who makes
1282 * the call. In other words, _every_ stat() generates a test for
1285 #endif /* badidea */
1286 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
1287 ac->axess = astat->CallerAccess;
1288 else /* not found, add a new one if possible */
1289 afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess);
1292 } /*afs_SimpleVStat */
1296 * Store the status info *only* back to the server for a
1299 * Environment: Must be called with a shared lock held on the vnode.
1301 * \param avc Ptr to the vcache entry.
1302 * \param astatus Ptr to the status info to store.
1303 * \param areq Ptr to the associated vrequest.
1305 * \return Operation status.
1309 afs_WriteVCache(struct vcache *avc,
1310 struct AFSStoreStatus *astatus,
1311 struct vrequest *areq)
1314 struct afs_conn *tc;
1315 struct AFSFetchStatus OutStatus;
1316 struct AFSVolSync tsync;
1317 struct rx_connection *rxconn;
1319 AFS_STATCNT(afs_WriteVCache);
1320 afs_Trace2(afs_iclSetp, CM_TRACE_WVCACHE, ICL_TYPE_POINTER, avc,
1321 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
1323 tc = afs_Conn(&avc->f.fid, areq, SHARED_LOCK, &rxconn);
1325 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_STORESTATUS);
1328 RXAFS_StoreStatus(rxconn, (struct AFSFid *)&avc->f.fid.Fid,
1329 astatus, &OutStatus, &tsync);
1334 } while (afs_Analyze
1335 (tc, rxconn, code, &avc->f.fid, areq, AFS_STATS_FS_RPCIDX_STORESTATUS,
1336 SHARED_LOCK, NULL));
1338 UpgradeSToWLock(&avc->lock, 20);
1340 /* success, do the changes locally */
1341 afs_SimpleVStat(avc, &OutStatus, areq);
1343 * Update the date, too. SimpleVStat didn't do this, since
1344 * it thought we were doing this after fetching new status
1345 * over a file being written.
1347 avc->f.m.Date = OutStatus.ClientModTime;
1349 /* failure, set up to check with server next time */
1350 ObtainWriteLock(&afs_xcbhash, 462);
1351 afs_DequeueCallback(avc);
1352 avc->f.states &= ~(CStatd | CUnique); /* turn off stat valid flag */
1353 ReleaseWriteLock(&afs_xcbhash);
1354 if ((avc->f.states & CForeign) || (avc->f.fid.Fid.Vnode & 1))
1355 osi_dnlc_purgedp(avc); /* if it (could be) a directory */
1357 ConvertWToSLock(&avc->lock);
1360 } /*afs_WriteVCache */
1363 * Store status info only locally, set the proper disconnection flags
1364 * and add to dirty list.
1366 * \param avc The vcache to be written locally.
1367 * \param astatus Get attr fields from local store.
1368 * \param attrs This one is only of the vs_size.
1370 * \note Must be called with a shared lock on the vnode
1373 afs_WriteVCacheDiscon(struct vcache *avc,
1374 struct AFSStoreStatus *astatus,
1375 struct vattr *attrs)
1378 afs_int32 flags = 0;
1380 UpgradeSToWLock(&avc->lock, 700);
1382 if (!astatus->Mask) {
1388 /* Set attributes. */
1389 if (astatus->Mask & AFS_SETMODTIME) {
1390 avc->f.m.Date = astatus->ClientModTime;
1391 flags |= VDisconSetTime;
1394 if (astatus->Mask & AFS_SETOWNER) {
1395 /* printf("Not allowed yet. \n"); */
1396 /*avc->f.m.Owner = astatus->Owner;*/
1399 if (astatus->Mask & AFS_SETGROUP) {
1400 /* printf("Not allowed yet. \n"); */
1401 /*avc->f.m.Group = astatus->Group;*/
1404 if (astatus->Mask & AFS_SETMODE) {
1405 avc->f.m.Mode = astatus->UnixModeBits;
1407 #if 0 /* XXX: Leaving this out, so it doesn't mess up the file type flag.*/
1409 if (vType(avc) == VREG) {
1410 avc->f.m.Mode |= S_IFREG;
1411 } else if (vType(avc) == VDIR) {
1412 avc->f.m.Mode |= S_IFDIR;
1413 } else if (vType(avc) == VLNK) {
1414 avc->f.m.Mode |= S_IFLNK;
1415 if ((avc->f.m.Mode & 0111) == 0)
1419 flags |= VDisconSetMode;
1420 } /* if(astatus.Mask & AFS_SETMODE) */
1422 } /* if (!astatus->Mask) */
1424 if (attrs->va_size > 0) {
1425 /* XXX: Do I need more checks? */
1426 /* Truncation operation. */
1427 flags |= VDisconTrunc;
1431 afs_DisconAddDirty(avc, flags, 1);
1433 /* XXX: How about the rest of the fields? */
1435 ConvertWToSLock(&avc->lock);
1441 * Copy astat block into vcache info
1443 * \note This code may get dataversion and length out of sync if the file has
1444 * been modified. This is less than ideal. I haven't thought about it sufficiently
1445 * to be certain that it is adequate.
1447 * \note Environment: Must be called under a write lock
1449 * \param avc Ptr to vcache entry.
1450 * \param astat Ptr to stat block to copy in.
1451 * \param areq Ptr to associated request.
1454 afs_ProcessFS(struct vcache *avc,
1455 struct AFSFetchStatus *astat, struct vrequest *areq)
1458 AFS_STATCNT(afs_ProcessFS);
1460 #ifdef AFS_64BIT_CLIENT
1461 FillInt64(length, astat->Length_hi, astat->Length);
1462 #else /* AFS_64BIT_CLIENT */
1463 length = astat->Length;
1464 #endif /* AFS_64BIT_CLIENT */
1465 /* WARNING: afs_DoBulkStat uses the Length field to store a sequence
1466 * number for each bulk status request. Under no circumstances
1467 * should afs_DoBulkStat store a sequence number if the new
1468 * length will be ignored when afs_ProcessFS is called with
1469 * new stats. If you change the following conditional then you
1470 * also need to change the conditional in afs_DoBulkStat. */
1472 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)
1473 && !AFS_VN_MAPPED((vnode_t *) avc)) {
1475 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)) {
1477 /* if we're writing or mapping this file, don't fetch over these
1480 afs_Trace3(afs_iclSetp, CM_TRACE_PROCESSFS, ICL_TYPE_POINTER, avc,
1481 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length),
1482 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length));
1483 avc->f.m.Length = length;
1484 avc->f.m.Date = astat->ClientModTime;
1486 hset64(avc->f.m.DataVersion, astat->dataVersionHigh, astat->DataVersion);
1487 avc->f.m.Owner = astat->Owner;
1488 avc->f.m.Mode = astat->UnixModeBits;
1489 avc->f.m.Group = astat->Group;
1490 avc->f.m.LinkCount = astat->LinkCount;
1491 if (astat->FileType == File) {
1492 vSetType(avc, VREG);
1493 avc->f.m.Mode |= S_IFREG;
1494 } else if (astat->FileType == Directory) {
1495 vSetType(avc, VDIR);
1496 avc->f.m.Mode |= S_IFDIR;
1497 } else if (astat->FileType == SymbolicLink) {
1498 if (afs_fakestat_enable && (avc->f.m.Mode & 0111) == 0) {
1499 vSetType(avc, VDIR);
1500 avc->f.m.Mode |= S_IFDIR;
1502 vSetType(avc, VLNK);
1503 avc->f.m.Mode |= S_IFLNK;
1505 if ((avc->f.m.Mode & 0111) == 0) {
1509 avc->f.anyAccess = astat->AnonymousAccess;
1511 if ((astat->CallerAccess & ~astat->AnonymousAccess))
1513 * Caller has at least one bit not covered by anonymous, and
1514 * thus may have interesting rights.
1516 * HOWEVER, this is a really bad idea, because any access query
1517 * for bits which aren't covered by anonymous, on behalf of a user
1518 * who doesn't have any special rights, will result in an answer of
1519 * the form "I don't know, lets make a FetchStatus RPC and find out!"
1520 * It's an especially bad idea under Ultrix, since (due to the lack of
1521 * a proper access() call) it must perform several afs_access() calls
1522 * in order to create magic mode bits that vary according to who makes
1523 * the call. In other words, _every_ stat() generates a test for
1526 #endif /* badidea */
1528 struct axscache *ac;
1529 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
1530 ac->axess = astat->CallerAccess;
1531 else /* not found, add a new one if possible */
1532 afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess);
1534 } /*afs_ProcessFS */
1538 * Get fid from server.
1541 * \param areq Request to be passed on.
1542 * \param name Name of ?? to lookup.
1543 * \param OutStatus Fetch status.
1548 * \return Success status of operation.
1551 afs_RemoteLookup(struct VenusFid *afid, struct vrequest *areq,
1552 char *name, struct VenusFid *nfid,
1553 struct AFSFetchStatus *OutStatusp,
1554 struct AFSCallBack *CallBackp, struct server **serverp,
1555 struct AFSVolSync *tsyncp)
1558 struct afs_conn *tc;
1559 struct rx_connection *rxconn;
1560 struct AFSFetchStatus OutDirStatus;
1563 name = ""; /* XXX */
1565 tc = afs_Conn(afid, areq, SHARED_LOCK, &rxconn);
1568 *serverp = tc->parent->srvr->server;
1569 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_XLOOKUP);
1572 RXAFS_Lookup(rxconn, (struct AFSFid *)&afid->Fid, name,
1573 (struct AFSFid *)&nfid->Fid, OutStatusp,
1574 &OutDirStatus, CallBackp, tsyncp);
1579 } while (afs_Analyze
1580 (tc, rxconn, code, afid, areq, AFS_STATS_FS_RPCIDX_XLOOKUP, SHARED_LOCK,
1590 * Given a file id and a vrequest structure, fetch the status
1591 * information associated with the file.
1593 * \param afid File ID.
1594 * \param areq Ptr to associated vrequest structure, specifying the
1595 * user whose authentication tokens will be used.
1596 * \param avc Caller may already have a vcache for this file, which is
1599 * \note Environment:
1600 * The cache entry is returned with an increased vrefCount field.
1601 * The entry must be discarded by calling afs_PutVCache when you
1602 * are through using the pointer to the cache entry.
1604 * You should not hold any locks when calling this function, except
1605 * locks on other vcache entries. If you lock more than one vcache
1606 * entry simultaneously, you should lock them in this order:
1608 * 1. Lock all files first, then directories.
1609 * 2. Within a particular type, lock entries in Fid.Vnode order.
1611 * This locking hierarchy is convenient because it allows locking
1612 * of a parent dir cache entry, given a file (to check its access
1613 * control list). It also allows renames to be handled easily by
1614 * locking directories in a constant order.
1616 * \note NB. NewVCache -> FlushVCache presently (4/10/95) drops the xvcache lock.
1618 * \note Might have a vcache structure already, which must
1619 * already be held by the caller
1622 afs_GetVCache(struct VenusFid *afid, struct vrequest *areq,
1623 afs_int32 * cached, struct vcache *avc)
1626 afs_int32 code, newvcache = 0;
1631 AFS_STATCNT(afs_GetVCache);
1634 *cached = 0; /* Init just in case */
1636 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1640 ObtainSharedLock(&afs_xvcache, 5);
1642 tvc = afs_FindVCache(afid, &retry, DO_STATS | DO_VLRU | IS_SLOCK);
1644 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1645 ReleaseSharedLock(&afs_xvcache);
1646 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1653 osi_Assert((tvc->f.states & CVInit) == 0);
1654 /* If we are in readdir, return the vnode even if not statd */
1655 if ((tvc->f.states & CStatd) || afs_InReadDir(tvc)) {
1656 ReleaseSharedLock(&afs_xvcache);
1660 UpgradeSToWLock(&afs_xvcache, 21);
1662 /* no cache entry, better grab one */
1663 tvc = afs_NewVCache(afid, NULL);
1666 ConvertWToSLock(&afs_xvcache);
1669 ReleaseSharedLock(&afs_xvcache);
1673 afs_stats_cmperf.vcacheMisses++;
1676 ReleaseSharedLock(&afs_xvcache);
1678 ObtainWriteLock(&tvc->lock, 54);
1680 if (tvc->f.states & CStatd) {
1681 ReleaseWriteLock(&tvc->lock);
1684 #ifdef AFS_DARWIN80_ENV
1685 /* Darwin 8.0 only has bufs in nfs, so we shouldn't have to worry about them.
1688 #if defined(AFS_DARWIN_ENV) || defined(AFS_FBSD_ENV)
1690 * XXX - I really don't like this. Should try to understand better.
1691 * It seems that sometimes, when we get called, we already hold the
1692 * lock on the vnode (e.g., from afs_getattr via afs_VerifyVCache).
1693 * We can't drop the vnode lock, because that could result in a race.
1694 * Sometimes, though, we get here and don't hold the vnode lock.
1695 * I hate code paths that sometimes hold locks and sometimes don't.
1696 * In any event, the dodge we use here is to check whether the vnode
1697 * is locked, and if it isn't, then we gain and drop it around the call
1698 * to vinvalbuf; otherwise, we leave it alone.
1701 struct vnode *vp = AFSTOV(tvc);
1704 #if defined(AFS_DARWIN_ENV)
1705 iheldthelock = VOP_ISLOCKED(vp);
1707 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, current_proc());
1708 /* this is messy. we can call fsync which will try to reobtain this */
1709 if (VTOAFS(vp) == tvc)
1710 ReleaseWriteLock(&tvc->lock);
1711 if (UBCINFOEXISTS(vp)) {
1712 vinvalbuf(vp, V_SAVE, &afs_osi_cred, current_proc(), PINOD, 0);
1714 if (VTOAFS(vp) == tvc)
1715 ObtainWriteLock(&tvc->lock, 954);
1717 VOP_UNLOCK(vp, LK_EXCLUSIVE, current_proc());
1718 #elif defined(AFS_FBSD80_ENV)
1719 iheldthelock = VOP_ISLOCKED(vp);
1720 if (!iheldthelock) {
1721 /* nosleep/sleep lock order reversal */
1722 int glocked = ISAFS_GLOCK();
1725 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1729 vinvalbuf(vp, V_SAVE, PINOD, 0); /* changed late in 8.0-CURRENT */
1732 #elif defined(AFS_FBSD60_ENV)
1733 iheldthelock = VOP_ISLOCKED(vp, curthread);
1735 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
1737 vinvalbuf(vp, V_SAVE, curthread, PINOD, 0);
1740 VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread);
1741 #elif defined(AFS_FBSD_ENV)
1742 iheldthelock = VOP_ISLOCKED(vp, curthread);
1744 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
1745 vinvalbuf(vp, V_SAVE, osi_curcred(), curthread, PINOD, 0);
1747 VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread);
1748 #elif defined(AFS_OBSD_ENV)
1749 iheldthelock = VOP_ISLOCKED(vp, curproc);
1751 VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY, curproc);
1752 uvm_vnp_uncache(vp);
1754 VOP_UNLOCK(vp, 0, curproc);
1755 #elif defined(AFS_NBSD40_ENV)
1756 iheldthelock = VOP_ISLOCKED(vp);
1757 if (!iheldthelock) {
1758 VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1760 uvm_vnp_uncache(vp);
1768 ObtainWriteLock(&afs_xcbhash, 464);
1769 tvc->f.states &= ~CUnique;
1771 afs_DequeueCallback(tvc);
1772 ReleaseWriteLock(&afs_xcbhash);
1774 /* It is always appropriate to throw away all the access rights? */
1775 afs_FreeAllAxs(&(tvc->Access));
1776 tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-volume info */
1778 if ((tvp->states & VForeign)) {
1780 tvc->f.states |= CForeign;
1781 if (newvcache && (tvp->rootVnode == afid->Fid.Vnode)
1782 && (tvp->rootUnique == afid->Fid.Unique)) {
1786 if (tvp->states & VRO)
1787 tvc->f.states |= CRO;
1788 if (tvp->states & VBackup)
1789 tvc->f.states |= CBackup;
1790 /* now copy ".." entry back out of volume structure, if necessary */
1791 if (tvc->mvstat == 2 && tvp->dotdot.Fid.Volume != 0) {
1793 tvc->mvid = (struct VenusFid *)
1794 osi_AllocSmallSpace(sizeof(struct VenusFid));
1795 *tvc->mvid = tvp->dotdot;
1797 afs_PutVolume(tvp, READ_LOCK);
1801 afs_RemoveVCB(afid);
1803 struct AFSFetchStatus OutStatus;
1805 if (afs_DynrootNewVnode(tvc, &OutStatus)) {
1806 afs_ProcessFS(tvc, &OutStatus, areq);
1807 tvc->f.states |= CStatd | CUnique;
1808 tvc->f.parent.vnode = OutStatus.ParentVnode;
1809 tvc->f.parent.unique = OutStatus.ParentUnique;
1813 if (AFS_IS_DISCONNECTED) {
1814 /* Nothing to do otherwise...*/
1816 /* printf("Network is down in afs_GetCache"); */
1818 code = afs_FetchStatus(tvc, afid, areq, &OutStatus);
1820 /* For the NFS translator's benefit, make sure
1821 * non-directory vnodes always have their parent FID set
1822 * correctly, even when created as a result of decoding an
1823 * NFS filehandle. It would be nice to also do this for
1824 * directories, but we can't because the fileserver fills
1825 * in the FID of the directory itself instead of that of
1828 if (!code && OutStatus.FileType != Directory &&
1829 !tvc->f.parent.vnode) {
1830 tvc->f.parent.vnode = OutStatus.ParentVnode;
1831 tvc->f.parent.unique = OutStatus.ParentUnique;
1832 /* XXX - SXW - It's conceivable we should mark ourselves
1833 * as dirty again here, incase we've been raced
1834 * out of the FetchStatus call.
1841 ReleaseWriteLock(&tvc->lock);
1847 ReleaseWriteLock(&tvc->lock);
1850 } /*afs_GetVCache */
1855 * Lookup a vcache by fid. Look inside the cache first, if not
1856 * there, lookup the file on the server, and then get it's fresh
1861 * \param cached Is element cached? If NULL, don't answer.
1865 * \return The found element or NULL.
1868 afs_LookupVCache(struct VenusFid *afid, struct vrequest *areq,
1869 afs_int32 * cached, struct vcache *adp, char *aname)
1871 afs_int32 code, now, newvcache = 0;
1872 struct VenusFid nfid;
1875 struct AFSFetchStatus OutStatus;
1876 struct AFSCallBack CallBack;
1877 struct AFSVolSync tsync;
1878 struct server *serverp = 0;
1882 AFS_STATCNT(afs_GetVCache);
1884 *cached = 0; /* Init just in case */
1886 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1890 ObtainReadLock(&afs_xvcache);
1891 tvc = afs_FindVCache(afid, &retry, DO_STATS /* no vlru */ );
1894 ReleaseReadLock(&afs_xvcache);
1896 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1897 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1901 ObtainReadLock(&tvc->lock);
1903 if (tvc->f.states & CStatd) {
1907 ReleaseReadLock(&tvc->lock);
1910 tvc->f.states &= ~CUnique;
1912 ReleaseReadLock(&tvc->lock);
1914 ObtainReadLock(&afs_xvcache);
1917 ReleaseReadLock(&afs_xvcache);
1919 /* lookup the file */
1922 origCBs = afs_allCBs; /* if anything changes, we don't have a cb */
1924 if (AFS_IS_DISCONNECTED) {
1925 /* printf("Network is down in afs_LookupVcache\n"); */
1929 afs_RemoteLookup(&adp->f.fid, areq, aname, &nfid, &OutStatus,
1930 &CallBack, &serverp, &tsync);
1932 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1936 ObtainSharedLock(&afs_xvcache, 6);
1937 tvc = afs_FindVCache(&nfid, &retry, DO_VLRU | IS_SLOCK/* no xstats now */ );
1939 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1940 ReleaseSharedLock(&afs_xvcache);
1941 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1947 /* no cache entry, better grab one */
1948 UpgradeSToWLock(&afs_xvcache, 22);
1949 tvc = afs_NewVCache(&nfid, serverp);
1951 ConvertWToSLock(&afs_xvcache);
1954 ReleaseSharedLock(&afs_xvcache);
1959 ReleaseSharedLock(&afs_xvcache);
1960 ObtainWriteLock(&tvc->lock, 55);
1962 /* It is always appropriate to throw away all the access rights? */
1963 afs_FreeAllAxs(&(tvc->Access));
1964 tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-vol info */
1966 if ((tvp->states & VForeign)) {
1968 tvc->f.states |= CForeign;
1969 if (newvcache && (tvp->rootVnode == afid->Fid.Vnode)
1970 && (tvp->rootUnique == afid->Fid.Unique))
1973 if (tvp->states & VRO)
1974 tvc->f.states |= CRO;
1975 if (tvp->states & VBackup)
1976 tvc->f.states |= CBackup;
1977 /* now copy ".." entry back out of volume structure, if necessary */
1978 if (tvc->mvstat == 2 && tvp->dotdot.Fid.Volume != 0) {
1980 tvc->mvid = (struct VenusFid *)
1981 osi_AllocSmallSpace(sizeof(struct VenusFid));
1982 *tvc->mvid = tvp->dotdot;
1987 ObtainWriteLock(&afs_xcbhash, 465);
1988 afs_DequeueCallback(tvc);
1989 tvc->f.states &= ~(CStatd | CUnique);
1990 ReleaseWriteLock(&afs_xcbhash);
1991 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
1992 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
1994 afs_PutVolume(tvp, READ_LOCK);
1995 ReleaseWriteLock(&tvc->lock);
2000 ObtainWriteLock(&afs_xcbhash, 466);
2001 if (origCBs == afs_allCBs) {
2002 if (CallBack.ExpirationTime) {
2003 tvc->callback = serverp;
2004 tvc->cbExpires = CallBack.ExpirationTime + now;
2005 tvc->f.states |= CStatd | CUnique;
2006 tvc->f.states &= ~CBulkFetching;
2007 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvp);
2008 } else if (tvc->f.states & CRO) {
2009 /* adapt gives us an hour. */
2010 tvc->cbExpires = 3600 + osi_Time();
2011 /*XXX*/ tvc->f.states |= CStatd | CUnique;
2012 tvc->f.states &= ~CBulkFetching;
2013 afs_QueueCallback(tvc, CBHash(3600), tvp);
2015 tvc->callback = NULL;
2016 afs_DequeueCallback(tvc);
2017 tvc->f.states &= ~(CStatd | CUnique);
2018 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
2019 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
2022 afs_DequeueCallback(tvc);
2023 tvc->f.states &= ~CStatd;
2024 tvc->f.states &= ~CUnique;
2025 tvc->callback = NULL;
2026 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
2027 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
2029 ReleaseWriteLock(&afs_xcbhash);
2031 afs_PutVolume(tvp, READ_LOCK);
2032 afs_ProcessFS(tvc, &OutStatus, areq);
2034 ReleaseWriteLock(&tvc->lock);
2040 afs_GetRootVCache(struct VenusFid *afid, struct vrequest *areq,
2041 afs_int32 * cached, struct volume *tvolp)
2043 afs_int32 code = 0, i, newvcache = 0, haveStatus = 0;
2044 afs_int32 getNewFid = 0;
2046 struct VenusFid nfid;
2048 struct server *serverp = 0;
2049 struct AFSFetchStatus OutStatus;
2050 struct AFSCallBack CallBack;
2051 struct AFSVolSync tsync;
2053 #ifdef AFS_DARWIN80_ENV
2060 if (!tvolp->rootVnode || getNewFid) {
2061 struct VenusFid tfid;
2064 tfid.Fid.Vnode = 0; /* Means get rootfid of volume */
2065 origCBs = afs_allCBs; /* ignore InitCallBackState */
2067 afs_RemoteLookup(&tfid, areq, NULL, &nfid, &OutStatus, &CallBack,
2072 /* ReleaseReadLock(&tvolp->lock); */
2073 ObtainWriteLock(&tvolp->lock, 56);
2074 tvolp->rootVnode = afid->Fid.Vnode = nfid.Fid.Vnode;
2075 tvolp->rootUnique = afid->Fid.Unique = nfid.Fid.Unique;
2076 ReleaseWriteLock(&tvolp->lock);
2077 /* ObtainReadLock(&tvolp->lock);*/
2080 afid->Fid.Vnode = tvolp->rootVnode;
2081 afid->Fid.Unique = tvolp->rootUnique;
2085 ObtainSharedLock(&afs_xvcache, 7);
2087 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2088 if (!FidCmp(&(tvc->f.fid), afid)) {
2089 if (tvc->f.states & CVInit) {
2090 ReleaseSharedLock(&afs_xvcache);
2091 afs_osi_Sleep(&tvc->f.states);
2094 #ifdef AFS_DARWIN80_ENV
2095 if (tvc->f.states & CDeadVnode) {
2096 if (!(tvc->f.states & CBulkFetching)) {
2097 ReleaseSharedLock(&afs_xvcache);
2098 afs_osi_Sleep(&tvc->f.states);
2103 if (vnode_get(tvp)) /* this bumps ref count */
2105 if (vnode_ref(tvp)) {
2107 /* AFSTOV(tvc) may be NULL */
2112 if (tvc->f.states & (CBulkFetching|CDeadVnode)) {
2114 vnode_recycle(AFSTOV(tvc));
2122 if (!haveStatus && (!tvc || !(tvc->f.states & CStatd))) {
2123 /* Mount point no longer stat'd or unknown. FID may have changed. */
2125 ReleaseSharedLock(&afs_xvcache);
2126 #ifdef AFS_DARWIN80_ENV
2129 vnode_put(AFSTOV(tvc));
2130 vnode_rele(AFSTOV(tvc));
2139 UpgradeSToWLock(&afs_xvcache, 23);
2140 /* no cache entry, better grab one */
2141 tvc = afs_NewVCache(afid, NULL);
2144 ReleaseWriteLock(&afs_xvcache);
2148 afs_stats_cmperf.vcacheMisses++;
2152 afs_stats_cmperf.vcacheHits++;
2153 #if defined(AFS_DARWIN80_ENV)
2154 /* we already bumped the ref count in the for loop above */
2155 #else /* AFS_DARWIN80_ENV */
2158 UpgradeSToWLock(&afs_xvcache, 24);
2159 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2160 refpanic("GRVC VLRU inconsistent0");
2162 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2163 refpanic("GRVC VLRU inconsistent1");
2165 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2166 refpanic("GRVC VLRU inconsistent2");
2168 QRemove(&tvc->vlruq); /* move to lruq head */
2169 QAdd(&VLRU, &tvc->vlruq);
2170 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2171 refpanic("GRVC VLRU inconsistent3");
2173 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2174 refpanic("GRVC VLRU inconsistent4");
2176 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2177 refpanic("GRVC VLRU inconsistent5");
2182 ReleaseWriteLock(&afs_xvcache);
2184 if (tvc->f.states & CStatd) {
2188 ObtainReadLock(&tvc->lock);
2189 tvc->f.states &= ~CUnique;
2190 tvc->callback = NULL; /* redundant, perhaps */
2191 ReleaseReadLock(&tvc->lock);
2194 ObtainWriteLock(&tvc->lock, 57);
2196 /* It is always appropriate to throw away all the access rights? */
2197 afs_FreeAllAxs(&(tvc->Access));
2200 tvc->f.states |= CForeign;
2201 if (tvolp->states & VRO)
2202 tvc->f.states |= CRO;
2203 if (tvolp->states & VBackup)
2204 tvc->f.states |= CBackup;
2205 /* now copy ".." entry back out of volume structure, if necessary */
2206 if (newvcache && (tvolp->rootVnode == afid->Fid.Vnode)
2207 && (tvolp->rootUnique == afid->Fid.Unique)) {
2210 if (tvc->mvstat == 2 && tvolp->dotdot.Fid.Volume != 0) {
2212 tvc->mvid = (struct VenusFid *)
2213 osi_AllocSmallSpace(sizeof(struct VenusFid));
2214 *tvc->mvid = tvolp->dotdot;
2218 afs_RemoveVCB(afid);
2221 struct VenusFid tfid;
2224 tfid.Fid.Vnode = 0; /* Means get rootfid of volume */
2225 origCBs = afs_allCBs; /* ignore InitCallBackState */
2227 afs_RemoteLookup(&tfid, areq, NULL, &nfid, &OutStatus, &CallBack,
2232 ObtainWriteLock(&afs_xcbhash, 467);
2233 afs_DequeueCallback(tvc);
2234 tvc->callback = NULL;
2235 tvc->f.states &= ~(CStatd | CUnique);
2236 ReleaseWriteLock(&afs_xcbhash);
2237 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
2238 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
2239 ReleaseWriteLock(&tvc->lock);
2244 ObtainWriteLock(&afs_xcbhash, 468);
2245 if (origCBs == afs_allCBs) {
2246 tvc->f.states |= CTruth;
2247 tvc->callback = serverp;
2248 if (CallBack.ExpirationTime != 0) {
2249 tvc->cbExpires = CallBack.ExpirationTime + start;
2250 tvc->f.states |= CStatd;
2251 tvc->f.states &= ~CBulkFetching;
2252 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvolp);
2253 } else if (tvc->f.states & CRO) {
2254 /* adapt gives us an hour. */
2255 tvc->cbExpires = 3600 + osi_Time();
2256 /*XXX*/ tvc->f.states |= CStatd;
2257 tvc->f.states &= ~CBulkFetching;
2258 afs_QueueCallback(tvc, CBHash(3600), tvolp);
2261 afs_DequeueCallback(tvc);
2262 tvc->callback = NULL;
2263 tvc->f.states &= ~(CStatd | CUnique);
2264 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
2265 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
2267 ReleaseWriteLock(&afs_xcbhash);
2268 afs_ProcessFS(tvc, &OutStatus, areq);
2270 ReleaseWriteLock(&tvc->lock);
2276 * Update callback status and (sometimes) attributes of a vnode.
2277 * Called after doing a fetch status RPC. Whilst disconnected, attributes
2278 * shouldn't be written to the vcache here.
2283 * \param Outsp Server status after rpc call.
2284 * \param acb Callback for this vnode.
2286 * \note The vcache must be write locked.
2289 afs_UpdateStatus(struct vcache *avc, struct VenusFid *afid,
2290 struct vrequest *areq, struct AFSFetchStatus *Outsp,
2291 struct AFSCallBack *acb, afs_uint32 start)
2293 struct volume *volp;
2296 /* Dont write status in vcache if resyncing after a disconnection. */
2297 afs_ProcessFS(avc, Outsp, areq);
2299 volp = afs_GetVolume(afid, areq, READ_LOCK);
2300 ObtainWriteLock(&afs_xcbhash, 469);
2301 avc->f.states |= CTruth;
2302 if (avc->callback /* check for race */ ) {
2303 if (acb->ExpirationTime != 0) {
2304 avc->cbExpires = acb->ExpirationTime + start;
2305 avc->f.states |= CStatd;
2306 avc->f.states &= ~CBulkFetching;
2307 afs_QueueCallback(avc, CBHash(acb->ExpirationTime), volp);
2308 } else if (avc->f.states & CRO) {
2309 /* ordinary callback on a read-only volume -- AFS 3.2 style */
2310 avc->cbExpires = 3600 + start;
2311 avc->f.states |= CStatd;
2312 avc->f.states &= ~CBulkFetching;
2313 afs_QueueCallback(avc, CBHash(3600), volp);
2315 afs_DequeueCallback(avc);
2316 avc->callback = NULL;
2317 avc->f.states &= ~(CStatd | CUnique);
2318 if ((avc->f.states & CForeign) || (avc->f.fid.Fid.Vnode & 1))
2319 osi_dnlc_purgedp(avc); /* if it (could be) a directory */
2322 afs_DequeueCallback(avc);
2323 avc->callback = NULL;
2324 avc->f.states &= ~(CStatd | CUnique);
2325 if ((avc->f.states & CForeign) || (avc->f.fid.Fid.Vnode & 1))
2326 osi_dnlc_purgedp(avc); /* if it (could be) a directory */
2328 ReleaseWriteLock(&afs_xcbhash);
2330 afs_PutVolume(volp, READ_LOCK);
2334 * Must be called with avc write-locked
2335 * don't absolutely have to invalidate the hint unless the dv has
2336 * changed, but be sure to get it right else there will be consistency bugs.
2339 afs_FetchStatus(struct vcache * avc, struct VenusFid * afid,
2340 struct vrequest * areq, struct AFSFetchStatus * Outsp)
2343 afs_uint32 start = 0;
2344 struct afs_conn *tc;
2345 struct AFSCallBack CallBack;
2346 struct AFSVolSync tsync;
2347 struct rx_connection *rxconn;
2350 tc = afs_Conn(afid, areq, SHARED_LOCK, &rxconn);
2351 avc->dchint = NULL; /* invalidate hints */
2353 avc->callback = tc->parent->srvr->server;
2355 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_FETCHSTATUS);
2358 RXAFS_FetchStatus(rxconn, (struct AFSFid *)&afid->Fid, Outsp,
2366 } while (afs_Analyze
2367 (tc, rxconn, code, afid, areq, AFS_STATS_FS_RPCIDX_FETCHSTATUS,
2368 SHARED_LOCK, NULL));
2371 afs_UpdateStatus(avc, afid, areq, Outsp, &CallBack, start);
2373 /* used to undo the local callback, but that's too extreme.
2374 * There are plenty of good reasons that fetchstatus might return
2375 * an error, such as EPERM. If we have the vnode cached, statd,
2376 * with callback, might as well keep track of the fact that we
2377 * don't have access...
2379 if (code == EPERM || code == EACCES) {
2380 struct axscache *ac;
2381 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
2383 else /* not found, add a new one if possible */
2384 afs_AddAxs(avc->Access, areq->uid, 0);
2395 * Stuff some information into the vcache for the given file.
2398 * afid : File in question.
2399 * OutStatus : Fetch status on the file.
2400 * CallBack : Callback info.
2401 * tc : RPC connection involved.
2402 * areq : vrequest involved.
2405 * Nothing interesting.
2408 afs_StuffVcache(struct VenusFid *afid,
2409 struct AFSFetchStatus *OutStatus,
2410 struct AFSCallBack *CallBack, struct afs_conn *tc,
2411 struct vrequest *areq)
2413 afs_int32 code, i, newvcache = 0;
2415 struct AFSVolSync tsync;
2417 struct axscache *ac;
2420 AFS_STATCNT(afs_StuffVcache);
2421 #ifdef IFS_VCACHECOUNT
2426 ObtainSharedLock(&afs_xvcache, 8);
2428 tvc = afs_FindVCache(afid, &retry, DO_VLRU| IS_SLOCK /* no stats */ );
2430 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
2431 ReleaseSharedLock(&afs_xvcache);
2432 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
2438 /* no cache entry, better grab one */
2439 UpgradeSToWLock(&afs_xvcache, 25);
2440 tvc = afs_NewVCache(afid, NULL);
2442 ConvertWToSLock(&afs_xvcache);
2445 ReleaseSharedLock(&afs_xvcache);
2450 ReleaseSharedLock(&afs_xvcache);
2451 ObtainWriteLock(&tvc->lock, 58);
2453 tvc->f.states &= ~CStatd;
2454 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
2455 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
2457 /* Is it always appropriate to throw away all the access rights? */
2458 afs_FreeAllAxs(&(tvc->Access));
2460 /*Copy useful per-volume info */
2461 tvp = afs_GetVolume(afid, areq, READ_LOCK);
2463 if (newvcache && (tvp->states & VForeign))
2464 tvc->f.states |= CForeign;
2465 if (tvp->states & VRO)
2466 tvc->f.states |= CRO;
2467 if (tvp->states & VBackup)
2468 tvc->f.states |= CBackup;
2470 * Now, copy ".." entry back out of volume structure, if
2473 if (tvc->mvstat == 2 && tvp->dotdot.Fid.Volume != 0) {
2475 tvc->mvid = (struct VenusFid *)
2476 osi_AllocSmallSpace(sizeof(struct VenusFid));
2477 *tvc->mvid = tvp->dotdot;
2480 /* store the stat on the file */
2481 afs_RemoveVCB(afid);
2482 afs_ProcessFS(tvc, OutStatus, areq);
2483 tvc->callback = tc->srvr->server;
2485 /* we use osi_Time twice below. Ideally, we would use the time at which
2486 * the FetchStatus call began, instead, but we don't have it here. So we
2487 * make do with "now". In the CRO case, it doesn't really matter. In
2488 * the other case, we hope that the difference between "now" and when the
2489 * call actually began execution on the server won't be larger than the
2490 * padding which the server keeps. Subtract 1 second anyway, to be on
2491 * the safe side. Can't subtract more because we don't know how big
2492 * ExpirationTime is. Possible consistency problems may arise if the call
2493 * timeout period becomes longer than the server's expiration padding. */
2494 ObtainWriteLock(&afs_xcbhash, 470);
2495 if (CallBack->ExpirationTime != 0) {
2496 tvc->cbExpires = CallBack->ExpirationTime + osi_Time() - 1;
2497 tvc->f.states |= CStatd;
2498 tvc->f.states &= ~CBulkFetching;
2499 afs_QueueCallback(tvc, CBHash(CallBack->ExpirationTime), tvp);
2500 } else if (tvc->f.states & CRO) {
2501 /* old-fashioned AFS 3.2 style */
2502 tvc->cbExpires = 3600 + osi_Time();
2503 /*XXX*/ tvc->f.states |= CStatd;
2504 tvc->f.states &= ~CBulkFetching;
2505 afs_QueueCallback(tvc, CBHash(3600), tvp);
2507 afs_DequeueCallback(tvc);
2508 tvc->callback = NULL;
2509 tvc->f.states &= ~(CStatd | CUnique);
2510 if ((tvc->f.states & CForeign) || (tvc->f.fid.Fid.Vnode & 1))
2511 osi_dnlc_purgedp(tvc); /* if it (could be) a directory */
2513 ReleaseWriteLock(&afs_xcbhash);
2515 afs_PutVolume(tvp, READ_LOCK);
2517 /* look in per-pag cache */
2518 if (tvc->Access && (ac = afs_FindAxs(tvc->Access, areq->uid)))
2519 ac->axess = OutStatus->CallerAccess; /* substitute pags */
2520 else /* not found, add a new one if possible */
2521 afs_AddAxs(tvc->Access, areq->uid, OutStatus->CallerAccess);
2523 ReleaseWriteLock(&tvc->lock);
2524 afs_Trace4(afs_iclSetp, CM_TRACE_STUFFVCACHE, ICL_TYPE_POINTER, tvc,
2525 ICL_TYPE_POINTER, tvc->callback, ICL_TYPE_INT32,
2526 tvc->cbExpires, ICL_TYPE_INT32, tvc->cbExpires - osi_Time());
2528 * Release ref count... hope this guy stays around...
2531 } /*afs_StuffVcache */
2535 * Decrements the reference count on a cache entry.
2537 * \param avc Pointer to the cache entry to decrement.
2539 * \note Environment: Nothing interesting.
2542 afs_PutVCache(struct vcache *avc)
2544 AFS_STATCNT(afs_PutVCache);
2545 #ifdef AFS_DARWIN80_ENV
2546 vnode_put(AFSTOV(avc));
2550 * Can we use a read lock here?
2552 ObtainReadLock(&afs_xvcache);
2554 ReleaseReadLock(&afs_xvcache);
2556 } /*afs_PutVCache */
2560 * Reset a vcache entry, so local contents are ignored, and the
2561 * server will be reconsulted next time the vcache is used
2563 * \param avc Pointer to the cache entry to reset
2566 * \note avc must be write locked on entry
2569 afs_ResetVCache(struct vcache *avc, afs_ucred_t *acred)
2571 ObtainWriteLock(&afs_xcbhash, 456);
2572 afs_DequeueCallback(avc);
2573 avc->f.states &= ~(CStatd | CDirty); /* next reference will re-stat */
2574 ReleaseWriteLock(&afs_xcbhash);
2575 /* now find the disk cache entries */
2576 afs_TryToSmush(avc, acred, 1);
2577 osi_dnlc_purgedp(avc);
2578 if (avc->linkData && !(avc->f.states & CCore)) {
2579 afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1);
2580 avc->linkData = NULL;
2585 * Sleepa when searching for a vcache. Releases all the pending locks,
2586 * sleeps then obtains the previously released locks.
2588 * \param vcache Enter sleep state.
2589 * \param flag Determines what locks to use.
2594 findvc_sleep(struct vcache *avc, int flag)
2596 int fstates = avc->f.states;
2597 if (flag & IS_SLOCK) {
2598 ReleaseSharedLock(&afs_xvcache);
2600 if (flag & IS_WLOCK) {
2601 ReleaseWriteLock(&afs_xvcache);
2603 ReleaseReadLock(&afs_xvcache);
2606 if (flag & FIND_CDEAD) {
2607 ObtainWriteLock(&afs_xvcache, 342);
2608 afs_FlushReclaimedVcaches();
2609 if (fstates == avc->f.states) {
2610 ReleaseWriteLock(&afs_xvcache);
2611 afs_osi_Sleep(&avc->f.states);
2613 ReleaseWriteLock(&afs_xvcache);
2615 afs_osi_Sleep(&avc->f.states);
2616 if (flag & IS_SLOCK) {
2617 ObtainSharedLock(&afs_xvcache, 341);
2619 if (flag & IS_WLOCK) {
2620 ObtainWriteLock(&afs_xvcache, 343);
2622 ObtainReadLock(&afs_xvcache);
2628 * Add a reference on an existing vcache entry.
2630 * \param tvc Pointer to the vcache.
2632 * \note Environment: Must be called with at least one reference from
2633 * elsewhere on the vcache, even if that reference will be dropped.
2634 * The global lock is required.
2636 * \return 0 on success, -1 on failure.
2640 afs_RefVCache(struct vcache *tvc)
2642 #ifdef AFS_DARWIN80_ENV
2646 /* AFS_STATCNT(afs_RefVCache); */
2648 #ifdef AFS_DARWIN80_ENV
2652 if (vnode_ref(tvp)) {
2654 /* AFSTOV(tvc) may be NULL */
2663 } /*afs_RefVCache */
2666 * Find a vcache entry given a fid.
2668 * \param afid Pointer to the fid whose cache entry we desire.
2669 * \param retry (SGI-specific) tell the caller to drop the lock on xvcache,
2670 * unlock the vnode, and try again.
2671 * \param flag Bit 1 to specify whether to compute hit statistics. Not
2672 * set if FindVCache is called as part of internal bookkeeping.
2674 * \note Environment: Must be called with the afs_xvcache lock at least held at
2675 * the read level. In order to do the VLRU adjustment, the xvcache lock
2676 * must be shared-- we upgrade it here.
2680 afs_FindVCache(struct VenusFid *afid, afs_int32 * retry, afs_int32 flag)
2685 #ifdef AFS_DARWIN80_ENV
2686 struct vcache *deadvc = NULL, *livevc = NULL;
2690 AFS_STATCNT(afs_FindVCache);
2694 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2695 if (FidMatches(afid, tvc)) {
2696 #ifdef AFS_DARWIN80_ENV
2697 if (flag & FIND_CDEAD) {
2698 if (tvc->f.states & (CDeadVnode|CBulkFetching)) {
2703 if (tvc->f.states & CDeadVnode)
2704 if ((tvc->f.states & CBulkFetching) &&
2705 !(flag & FIND_BULKDEAD))
2709 if (tvc->f.states & CVInit) {
2710 findvc_sleep(tvc, flag);
2713 #ifdef AFS_DARWIN80_ENV
2714 if (tvc->f.states & CDeadVnode) {
2715 findvc_sleep(tvc, flag);
2718 if (flag & FIND_CDEAD) {
2726 #ifdef AFS_DARWIN80_ENV
2727 if (flag & FIND_CDEAD) {
2728 if (livevc && deadvc) {
2729 /* discard deadvc */
2731 vnode_recycle(AFSTOV(deadvc));
2732 vnode_put(AFSTOV(deadvc));
2733 vnode_rele(AFSTOV(deadvc));
2738 /* return what's left */
2739 tvc = livevc ? livevc : deadvc;
2743 /* should I have a read lock on the vnode here? */
2747 #if defined(AFS_DARWIN80_ENV)
2751 if (tvp && vnode_ref(tvp)) {
2753 /* AFSTOV(tvc) may be NULL */
2758 if (tvp && (tvc->f.states & (CBulkFetching|CDeadVnode))) {
2760 vnode_recycle(AFSTOV(tvc));
2767 #elif defined(AFS_DARWIN_ENV)
2768 tvc->f.states |= CUBCinit;
2770 if (UBCINFOMISSING(AFSTOV(tvc)) ||
2771 UBCINFORECLAIMED(AFSTOV(tvc))) {
2772 ubc_info_init(AFSTOV(tvc));
2775 tvc->f.states &= ~CUBCinit;
2777 osi_vnhold(tvc, retry); /* already held, above */
2778 if (retry && *retry)
2782 * only move to front of vlru if we have proper vcache locking)
2784 if (flag & DO_VLRU) {
2785 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2786 refpanic("FindVC VLRU inconsistent1");
2788 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2789 refpanic("FindVC VLRU inconsistent1");
2791 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2792 refpanic("FindVC VLRU inconsistent2");
2794 UpgradeSToWLock(&afs_xvcache, 26);
2795 QRemove(&tvc->vlruq);
2796 QAdd(&VLRU, &tvc->vlruq);
2797 ConvertWToSLock(&afs_xvcache);
2798 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2799 refpanic("FindVC VLRU inconsistent1");
2801 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2802 refpanic("FindVC VLRU inconsistent2");
2804 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2805 refpanic("FindVC VLRU inconsistent3");
2811 if (flag & DO_STATS) {
2813 afs_stats_cmperf.vcacheHits++;
2815 afs_stats_cmperf.vcacheMisses++;
2816 if (afs_IsPrimaryCellNum(afid->Cell))
2817 afs_stats_cmperf.vlocalAccesses++;
2819 afs_stats_cmperf.vremoteAccesses++;
2822 } /*afs_FindVCache */
2825 * Find a vcache entry given a fid. Does a wildcard match on what we
2826 * have for the fid. If more than one entry, don't return anything.
2828 * \param avcp Fill in pointer if we found one and only one.
2829 * \param afid Pointer to the fid whose cache entry we desire.
2830 * \param retry (SGI-specific) tell the caller to drop the lock on xvcache,
2831 * unlock the vnode, and try again.
2832 * \param flags bit 1 to specify whether to compute hit statistics. Not
2833 * set if FindVCache is called as part of internal bookkeeping.
2835 * \note Environment: Must be called with the afs_xvcache lock at least held at
2836 * the read level. In order to do the VLRU adjustment, the xvcache lock
2837 * must be shared-- we upgrade it here.
2839 * \return Number of matches found.
2842 int afs_duplicate_nfs_fids = 0;
2845 afs_NFSFindVCache(struct vcache **avcp, struct VenusFid *afid)
2849 afs_int32 count = 0;
2850 struct vcache *found_tvc = NULL;
2851 #ifdef AFS_DARWIN80_ENV
2855 AFS_STATCNT(afs_FindVCache);
2859 ObtainSharedLock(&afs_xvcache, 331);
2862 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2863 /* Match only on what we have.... */
2864 if (((tvc->f.fid.Fid.Vnode & 0xffff) == afid->Fid.Vnode)
2865 && (tvc->f.fid.Fid.Volume == afid->Fid.Volume)
2866 && ((tvc->f.fid.Fid.Unique & 0xffffff) == afid->Fid.Unique)
2867 && (tvc->f.fid.Cell == afid->Cell)) {
2868 if (tvc->f.states & CVInit) {
2869 ReleaseSharedLock(&afs_xvcache);
2870 afs_osi_Sleep(&tvc->f.states);
2873 #ifdef AFS_DARWIN80_ENV
2874 if (tvc->f.states & CDeadVnode) {
2875 if (!(tvc->f.states & CBulkFetching)) {
2876 ReleaseSharedLock(&afs_xvcache);
2877 afs_osi_Sleep(&tvc->f.states);
2882 if (vnode_get(tvp)) {
2883 /* This vnode no longer exists. */
2886 if (vnode_ref(tvp)) {
2887 /* This vnode no longer exists. */
2889 /* AFSTOV(tvc) may be NULL */
2894 if (tvc->f.states & (CBulkFetching|CDeadVnode)) {
2896 vnode_recycle(AFSTOV(tvc));
2899 #endif /* AFS_DARWIN80_ENV */
2903 afs_duplicate_nfs_fids++;
2904 ReleaseSharedLock(&afs_xvcache);
2905 #ifdef AFS_DARWIN80_ENV
2906 /* Drop our reference counts. */
2907 vnode_put(AFSTOV(tvc));
2908 vnode_put(AFSTOV(found_tvc));
2917 /* should I have a read lock on the vnode here? */
2919 #ifndef AFS_DARWIN80_ENV
2920 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
2921 afs_int32 retry = 0;
2922 osi_vnhold(tvc, &retry);
2925 found_tvc = (struct vcache *)0;
2926 ReleaseSharedLock(&afs_xvcache);
2927 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
2931 osi_vnhold(tvc, (int *)0); /* already held, above */
2935 * We obtained the xvcache lock above.
2937 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2938 refpanic("FindVC VLRU inconsistent1");
2940 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2941 refpanic("FindVC VLRU inconsistent1");
2943 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2944 refpanic("FindVC VLRU inconsistent2");
2946 UpgradeSToWLock(&afs_xvcache, 568);
2947 QRemove(&tvc->vlruq);
2948 QAdd(&VLRU, &tvc->vlruq);
2949 ConvertWToSLock(&afs_xvcache);
2950 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2951 refpanic("FindVC VLRU inconsistent1");
2953 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2954 refpanic("FindVC VLRU inconsistent2");
2956 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2957 refpanic("FindVC VLRU inconsistent3");
2963 afs_stats_cmperf.vcacheHits++;
2965 afs_stats_cmperf.vcacheMisses++;
2966 if (afs_IsPrimaryCellNum(afid->Cell))
2967 afs_stats_cmperf.vlocalAccesses++;
2969 afs_stats_cmperf.vremoteAccesses++;
2971 *avcp = tvc; /* May be null */
2973 ReleaseSharedLock(&afs_xvcache);
2974 return (tvc ? 1 : 0);
2976 } /*afs_NFSFindVCache */
2982 * Initialize vcache related variables
2987 afs_vcacheInit(int astatSize)
2989 #if !defined(AFS_LINUX22_ENV)
2993 if (!afs_maxvcount) {
2994 afs_maxvcount = astatSize; /* no particular limit on linux? */
2996 #if !defined(AFS_LINUX22_ENV)
3000 AFS_RWLOCK_INIT(&afs_xvcache, "afs_xvcache");
3001 LOCK_INIT(&afs_xvcb, "afs_xvcb");
3003 #if !defined(AFS_LINUX22_ENV)
3004 /* Allocate and thread the struct vcache entries */
3005 tvp = afs_osi_Alloc(astatSize * sizeof(struct vcache));
3006 osi_Assert(tvp != NULL);
3007 memset(tvp, 0, sizeof(struct vcache) * astatSize);
3009 Initial_freeVCList = tvp;
3010 freeVCList = &(tvp[0]);
3011 for (i = 0; i < astatSize - 1; i++) {
3012 tvp[i].nextfree = &(tvp[i + 1]);
3014 tvp[astatSize - 1].nextfree = NULL;
3015 # ifdef KERNEL_HAVE_PIN
3016 pin((char *)tvp, astatSize * sizeof(struct vcache)); /* XXX */
3020 #if defined(AFS_SGI_ENV)
3021 for (i = 0; i < astatSize; i++) {
3022 char name[METER_NAMSZ];
3023 struct vcache *tvc = &tvp[i];
3025 tvc->v.v_number = ++afsvnumbers;
3026 tvc->vc_rwlockid = OSI_NO_LOCKID;
3027 initnsema(&tvc->vc_rwlock, 1,
3028 makesname(name, "vrw", tvc->v.v_number));
3029 #ifndef AFS_SGI53_ENV
3030 initnsema(&tvc->v.v_sync, 0, makesname(name, "vsy", tvc->v.v_number));
3032 #ifndef AFS_SGI62_ENV
3033 initnlock(&tvc->v.v_lock, makesname(name, "vlk", tvc->v.v_number));
3034 #endif /* AFS_SGI62_ENV */
3038 for(i = 0; i < VCSIZE; ++i)
3039 QInit(&afs_vhashTV[i]);
3046 shutdown_vcache(void)
3049 struct afs_cbr *tsp;
3051 * XXX We may potentially miss some of the vcaches because if when
3052 * there are no free vcache entries and all the vcache entries are active
3053 * ones then we allocate an additional one - admittedly we almost never
3058 struct afs_q *tq, *uq = NULL;
3060 for (tq = VLRU.prev; tq != &VLRU; tq = uq) {
3064 osi_FreeSmallSpace(tvc->mvid);
3065 tvc->mvid = (struct VenusFid *)0;
3068 aix_gnode_rele(AFSTOV(tvc));
3070 if (tvc->linkData) {
3071 afs_osi_Free(tvc->linkData, strlen(tvc->linkData) + 1);
3076 * Also free the remaining ones in the Cache
3078 for (i = 0; i < VCSIZE; i++) {
3079 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
3081 osi_FreeSmallSpace(tvc->mvid);
3082 tvc->mvid = (struct VenusFid *)0;
3086 afs_osi_Free(tvc->v.v_gnode, sizeof(struct gnode));
3087 #ifdef AFS_AIX32_ENV
3090 vms_delete(tvc->segid);
3092 tvc->segid = tvc->vmh = NULL;
3093 if (VREFCOUNT_GT(tvc,0))
3094 osi_Panic("flushVcache: vm race");
3102 #if defined(AFS_SUN5_ENV)
3108 if (tvc->linkData) {
3109 afs_osi_Free(tvc->linkData, strlen(tvc->linkData) + 1);
3114 afs_FreeAllAxs(&(tvc->Access));
3120 * Free any leftover callback queue
3122 for (i = 0; i < afs_stats_cmperf.CallBackAlloced; i++) {
3123 tsp = afs_cbrHeads[i];
3124 afs_cbrHeads[i] = 0;
3125 afs_osi_Free((char *)tsp, AFS_NCBRS * sizeof(struct afs_cbr));
3129 #if !defined(AFS_LINUX22_ENV)
3130 afs_osi_Free(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache));
3132 # ifdef KERNEL_HAVE_PIN
3133 unpin(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache));
3136 freeVCList = Initial_freeVCList = 0;
3139 AFS_RWLOCK_INIT(&afs_xvcache, "afs_xvcache");
3140 LOCK_INIT(&afs_xvcb, "afs_xvcb");
3142 for(i = 0; i < VCSIZE; ++i)
3143 QInit(&afs_vhashTV[i]);
3147 afs_DisconGiveUpCallbacks(void)
3153 ObtainWriteLock(&afs_xvcache, 1002); /* XXX - should be a unique number */
3156 /* Somehow, walk the set of vcaches, with each one coming out as tvc */
3157 for (i = 0; i < VCSIZE; i++) {
3158 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
3160 if (afs_QueueVCB(tvc, &slept)) {
3161 tvc->callback = NULL;
3170 ReleaseWriteLock(&afs_xvcache);
3177 * Clear the Statd flag from all vcaches
3179 * This function removes the Statd flag from all vcaches. It's used by
3180 * disconnected mode to tidy up during reconnection
3184 afs_ClearAllStatdFlag(void)
3189 ObtainWriteLock(&afs_xvcache, 715);
3191 for (i = 0; i < VCSIZE; i++) {
3192 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
3193 tvc->f.states &= ~(CStatd|CUnique);
3196 ReleaseWriteLock(&afs_xvcache);