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
39 #include <afsconfig.h>
40 #include "afs/param.h"
42 #include "afs/sysincludes.h" /*Standard vendor system headers */
43 #include "afsincludes.h" /*AFS-based standard headers */
44 #include "afs/afs_stats.h"
45 #include "afs/afs_cbqueue.h"
46 #include "afs/afs_osidnlc.h"
48 afs_int32 afs_maxvcount = 0; /* max number of vcache entries */
49 afs_int32 afs_vcount = 0; /* number of vcache in use now */
57 #endif /* AFS_SGI64_ENV */
59 /* Exported variables */
60 afs_rwlock_t afs_xvcdirty; /*Lock: discon vcache dirty list mgmt */
61 afs_rwlock_t afs_xvcache; /*Lock: alloc new stat cache entries */
62 afs_rwlock_t afs_xvreclaim; /*Lock: entries reclaimed, not on free list */
63 afs_lock_t afs_xvcb; /*Lock: fids on which there are callbacks */
64 #if !defined(AFS_LINUX22_ENV)
65 static struct vcache *freeVCList; /*Free list for stat cache entries */
66 struct vcache *ReclaimedVCList; /*Reclaimed list for stat entries */
67 static struct vcache *Initial_freeVCList; /*Initial list for above */
69 struct afs_q VLRU; /*vcache LRU */
70 afs_int32 vcachegen = 0;
71 unsigned int afs_paniconwarn = 0;
72 struct vcache *afs_vhashT[VCSIZE];
73 struct afs_q afs_vhashTV[VCSIZE];
74 static struct afs_cbr *afs_cbrHashT[CBRSIZE];
75 afs_int32 afs_bulkStatsLost;
76 int afs_norefpanic = 0;
79 /* Disk backed vcache definitions
80 * Both protected by xvcache */
81 static int afs_nextVcacheSlot = 0;
82 static struct afs_slotlist *afs_freeSlotList = NULL;
84 /* Forward declarations */
85 static afs_int32 afs_QueueVCB(struct vcache *avc, int *slept);
89 * The PFlush algorithm makes use of the fact that Fid.Unique is not used in
90 * below hash algorithms. Change it if need be so that flushing algorithm
91 * doesn't move things from one hash chain to another.
93 /* Don't hash on the cell; our callback-breaking code sometimes fails to compute
94 * the cell correctly, and only scans one hash bucket. */
95 int VCHash(struct VenusFid *fid)
97 return opr_jhash_int2(fid->Fid.Volume, fid->Fid.Vnode, 0) &
98 opr_jhash_mask(VCSIZEBITS);
100 /* Hash only on volume to speed up volume callbacks. */
101 int VCHashV(struct VenusFid *fid)
103 return opr_jhash_int(fid->Fid.Volume, 0) & opr_jhash_mask(VCSIZEBITS);
107 * Generate an index into the hash table for a given Fid.
109 * \return The hash value.
112 afs_HashCBRFid(struct AFSFid *fid)
114 return (fid->Volume + fid->Vnode + fid->Unique) % CBRSIZE;
118 * Insert a CBR entry into the hash table.
119 * Must be called with afs_xvcb held.
124 afs_InsertHashCBR(struct afs_cbr *cbr)
126 int slot = afs_HashCBRFid(&cbr->fid);
128 cbr->hash_next = afs_cbrHashT[slot];
129 if (afs_cbrHashT[slot])
130 afs_cbrHashT[slot]->hash_pprev = &cbr->hash_next;
132 cbr->hash_pprev = &afs_cbrHashT[slot];
133 afs_cbrHashT[slot] = cbr;
138 * Flush the given vcache entry.
141 * afs_xvcache lock must be held for writing upon entry to
142 * prevent people from changing the vrefCount field, and to
143 * protect the lruq and hnext fields.
144 * LOCK: afs_FlushVCache afs_xvcache W
145 * REFCNT: vcache ref count must be zero on entry except for osf1
146 * RACE: lock is dropped and reobtained, permitting race in caller
148 * \param avc Pointer to vcache entry to flush.
149 * \param slept Pointer to int to set 1 if we sleep/drop locks, 0 if we don't.
153 afs_FlushVCache(struct vcache *avc, int *slept)
154 { /*afs_FlushVCache */
157 struct vcache **uvc, *wvc;
159 /* NOTE: We must have nothing drop afs_xvcache until we have removed all
160 * possible references to this vcache. This means all hash tables, queues,
164 AFS_STATCNT(afs_FlushVCache);
165 afs_Trace2(afs_iclSetp, CM_TRACE_FLUSHV, ICL_TYPE_POINTER, avc,
166 ICL_TYPE_INT32, avc->f.states);
168 code = osi_VM_FlushVCache(avc);
172 if (avc->f.states & CVFlushed) {
176 #if !defined(AFS_LINUX22_ENV)
177 if (avc->nextfree || !avc->vlruq.prev || !avc->vlruq.next) { /* qv afs.h */
178 refpanic("LRU vs. Free inconsistency");
181 avc->f.states |= CVFlushed;
182 /* pull the entry out of the lruq and put it on the free list */
183 QRemove(&avc->vlruq);
185 /* keep track of # of files that we bulk stat'd, but never used
186 * before they got recycled.
188 if (avc->f.states & CBulkStat)
191 /* remove entry from the hash chain */
192 i = VCHash(&avc->f.fid);
193 uvc = &afs_vhashT[i];
194 for (wvc = *uvc; wvc; uvc = &wvc->hnext, wvc = *uvc) {
202 /* remove entry from the volume hash table */
203 QRemove(&avc->vhashq);
205 #if defined(AFS_LINUX26_ENV)
207 struct pagewriter *pw, *store;
208 struct list_head tofree;
210 INIT_LIST_HEAD(&tofree);
211 spin_lock(&avc->pagewriter_lock);
212 list_for_each_entry_safe(pw, store, &avc->pagewriters, link) {
214 /* afs_osi_Free may sleep so we need to defer it */
215 list_add_tail(&pw->link, &tofree);
217 spin_unlock(&avc->pagewriter_lock);
218 list_for_each_entry_safe(pw, store, &tofree, link) {
220 afs_osi_Free(pw, sizeof(struct pagewriter));
225 if (avc->mvid.target_root)
226 osi_FreeSmallSpace(avc->mvid.target_root);
227 avc->mvid.target_root = NULL;
229 afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1);
230 avc->linkData = NULL;
232 #if defined(AFS_XBSD_ENV) || defined(AFS_DARWIN_ENV)
233 /* OK, there are no internal vrefCounts, so there shouldn't
234 * be any more refs here. */
236 #ifdef AFS_DARWIN80_ENV
237 vnode_clearfsnode(AFSTOV(avc));
238 vnode_removefsref(AFSTOV(avc));
240 avc->v->v_data = NULL; /* remove from vnode */
242 AFSTOV(avc) = NULL; /* also drop the ptr to vnode */
246 #ifdef AFS_SUN511_ENV
251 #elif defined(AFS_SUN510_ENV)
252 /* As we use private vnodes, cleanup is up to us */
253 vn_reinit(AFSTOV(avc));
255 afs_FreeAllAxs(&(avc->Access));
256 afs_StaleVCacheFlags(avc, AFS_STALEVC_FILENAME, CUnique);
258 /* By this point, the vcache has been removed from all global structures
259 * via which someone could try to use the vcache. It is okay to drop
260 * afs_xvcache at this point (if *slept is set). */
262 if (afs_shuttingdown == AFS_RUNNING)
263 afs_QueueVCB(avc, slept);
266 * Next, keep track of which vnodes we've deleted for create's
267 * optimistic synchronization algorithm
270 if (avc->f.fid.Fid.Vnode & 1)
276 #if !defined(AFS_LINUX22_ENV)
277 /* put the entry in the free list */
278 avc->nextfree = freeVCList;
280 if (avc->vlruq.prev || avc->vlruq.next) {
281 refpanic("LRU vs. Free inconsistency");
283 avc->f.states |= CVFlushed;
285 /* This should put it back on the vnode free list since usecount is 1 */
287 if (VREFCOUNT_GT(avc,0)) {
288 AFS_RELE(AFSTOV(avc));
289 afs_stats_cmperf.vcacheXAllocs--;
291 if (afs_norefpanic) {
292 afs_warn("flush vc refcnt < 1");
295 osi_Panic("flush vc refcnt < 1");
297 #endif /* AFS_LINUX22_ENV */
302 } /*afs_FlushVCache */
306 * The core of the inactive vnode op for all but IRIX.
312 afs_InactiveVCache(struct vcache *avc, afs_ucred_t *acred)
314 AFS_STATCNT(afs_inactive);
315 if (avc->f.states & CDirty) {
316 /* we can't keep trying to push back dirty data forever. Give up. */
317 afs_InvalidateAllSegments(avc); /* turns off dirty bit */
319 avc->f.states &= ~CMAPPED;
320 avc->f.states &= ~CDirty; /* Turn it off */
321 if (avc->f.states & CUnlinked) {
322 if (CheckLock(&afs_xvcache) || CheckLock(&afs_xdcache)) {
323 avc->f.states |= CUnlinkedDel;
326 afs_remunlink(avc, 1); /* ignore any return code */
333 * Allocate a callback return structure from the
334 * free list and return it.
336 * Environment: The alloc and free routines are both called with the afs_xvcb lock
337 * held, so we don't have to worry about blocking in osi_Alloc.
339 * \return The allocated afs_cbr.
341 static struct afs_cbr *afs_cbrSpace = 0;
342 /* if alloc limit below changes, fix me! */
343 static struct afs_cbr *afs_cbrHeads[16];
350 while (!afs_cbrSpace) {
351 if (afs_stats_cmperf.CallBackAlloced >= sizeof(afs_cbrHeads)/sizeof(afs_cbrHeads[0])) {
352 /* don't allocate more than 16 * AFS_NCBRS for now */
354 afs_stats_cmperf.CallBackFlushes++;
357 tsp = afs_osi_Alloc(AFS_NCBRS * sizeof(struct afs_cbr));
358 osi_Assert(tsp != NULL);
359 for (i = 0; i < AFS_NCBRS - 1; i++) {
360 tsp[i].next = &tsp[i + 1];
362 tsp[AFS_NCBRS - 1].next = 0;
364 afs_cbrHeads[afs_stats_cmperf.CallBackAlloced] = tsp;
365 afs_stats_cmperf.CallBackAlloced++;
369 afs_cbrSpace = tsp->next;
374 * Free a callback return structure, removing it from all lists.
376 * Environment: the xvcb lock is held over these calls.
378 * \param asp The address of the structure to free.
383 afs_FreeCBR(struct afs_cbr *asp)
385 *(asp->pprev) = asp->next;
387 asp->next->pprev = asp->pprev;
389 *(asp->hash_pprev) = asp->hash_next;
391 asp->hash_next->hash_pprev = asp->hash_pprev;
393 asp->next = afs_cbrSpace;
399 FlushAllVCBs(int nconns, struct rx_connection **rxconns,
400 struct afs_conn **conns)
405 results = afs_osi_Alloc(nconns * sizeof (afs_int32));
406 osi_Assert(results != NULL);
409 multi_Rx(rxconns,nconns)
411 multi_RXAFS_GiveUpAllCallBacks();
412 results[multi_i] = multi_error;
417 * Freeing the CBR will unlink it from the server's CBR list
418 * do it here, not in the loop, because a dynamic CBR will call
419 * into the memory management routines.
421 for ( i = 0 ; i < nconns ; i++ ) {
422 if (results[i] == 0) {
423 /* Unchain all of them */
424 while (conns[i]->parent->srvr->server->cbrs)
425 afs_FreeCBR(conns[i]->parent->srvr->server->cbrs);
428 afs_osi_Free(results, nconns * sizeof(afs_int32));
432 * Flush all queued callbacks to all servers.
434 * Environment: holds xvcb lock over RPC to guard against race conditions
435 * when a new callback is granted for the same file later on.
437 * \return 0 for success.
440 afs_FlushVCBs(afs_int32 lockit)
442 struct AFSFid *tfids;
443 struct AFSCallBack callBacks[1];
444 struct AFSCBFids fidArray;
445 struct AFSCBs cbArray;
447 struct afs_cbr *tcbrp;
451 struct vrequest *treq = NULL;
453 int safety1, safety2, safety3;
456 if (AFS_IS_DISCONNECTED)
459 if ((code = afs_CreateReq(&treq, afs_osi_credp)))
461 treq->flags |= O_NONBLOCK;
462 tfids = afs_osi_Alloc(sizeof(struct AFSFid) * AFS_MAXCBRSCALL);
463 osi_Assert(tfids != NULL);
466 ObtainWriteLock(&afs_xvcb, 273);
469 * First, attempt a multi across everything, all addresses
470 * for all servers we know of.
474 afs_LoopServers(AFS_LS_ALL, NULL, 0, FlushAllVCBs, NULL);
476 ObtainReadLock(&afs_xserver);
477 for (i = 0; i < NSERVERS; i++) {
478 for (safety1 = 0, tsp = afs_servers[i];
479 tsp && safety1 < afs_totalServers + 10;
480 tsp = tsp->next, safety1++) {
482 if (tsp->cbrs == (struct afs_cbr *)0)
485 /* otherwise, grab a block of AFS_MAXCBRSCALL from the list
486 * and make an RPC, over and over again.
488 tcount = 0; /* number found so far */
489 for (safety2 = 0; safety2 < afs_cacheStats; safety2++) {
490 if (tcount >= AFS_MAXCBRSCALL || !tsp->cbrs) {
491 struct rx_connection *rxconn;
492 /* if buffer is full, or we've queued all we're going
493 * to from this server, we should flush out the
496 fidArray.AFSCBFids_len = tcount;
497 fidArray.AFSCBFids_val = (struct AFSFid *)tfids;
498 cbArray.AFSCBs_len = 1;
499 cbArray.AFSCBs_val = callBacks;
500 memset(&callBacks[0], 0, sizeof(callBacks[0]));
501 callBacks[0].CallBackType = CB_EXCLUSIVE;
502 for (safety3 = 0; safety3 < AFS_MAXHOSTS * 2; safety3++) {
503 tc = afs_ConnByHost(tsp, tsp->cell->fsport,
504 tsp->cell->cellNum, treq, 0,
505 SHARED_LOCK, 0, &rxconn);
508 (AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS);
511 RXAFS_GiveUpCallBacks(rxconn, &fidArray,
518 (tc, rxconn, code, 0, treq,
519 AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS, SHARED_LOCK,
524 /* ignore return code, since callbacks may have
525 * been returned anyway, we shouldn't leave them
526 * around to be returned again.
528 * Next, see if we are done with this server, and if so,
529 * break to deal with the next one.
535 /* if to flush full buffer */
536 /* if we make it here, we have an entry at the head of cbrs,
537 * which we should copy to the file ID array and then free.
540 tfids[tcount++] = tcbrp->fid;
542 /* Freeing the CBR will unlink it from the server's CBR list */
544 } /* while loop for this one server */
545 if (safety2 > afs_cacheStats) {
546 afs_warn("possible internal error afs_flushVCBs (%d)\n",
549 } /* for loop for this hash chain */
550 } /* loop through all hash chains */
551 if (safety1 > afs_totalServers + 2) {
553 ("AFS internal error (afs_flushVCBs) (%d > %d), continuing...\n",
554 safety1, afs_totalServers + 2);
556 osi_Panic("afs_flushVCBS safety1");
559 ReleaseReadLock(&afs_xserver);
561 ReleaseWriteLock(&afs_xvcb);
562 afs_osi_Free(tfids, sizeof(struct AFSFid) * AFS_MAXCBRSCALL);
563 afs_DestroyReq(treq);
568 * Queue a callback on the given fid.
571 * Locks the xvcb lock.
572 * Called when the xvcache lock is already held.
573 * RACE: afs_xvcache may be dropped and reacquired
575 * \param avc vcache entry
576 * \param slep Set to 1 if we dropped afs_xvcache
577 * \return 1 if queued, 0 otherwise
581 afs_QueueVCB(struct vcache *avc, int *slept)
585 struct afs_cbr *tcbp;
588 AFS_STATCNT(afs_QueueVCB);
590 ObtainWriteLock(&afs_xvcb, 274);
592 /* we can't really give back callbacks on RO files, since the
593 * server only tracks them on a per-volume basis, and we don't
594 * know whether we still have some other files from the same
596 if (!((avc->f.states & CRO) == 0 && avc->callback)) {
600 /* The callback is really just a struct server ptr. */
601 tsp = (struct server *)(avc->callback);
604 /* If we don't have CBR space, AllocCBR may block or hit the net for
605 * clearing up CBRs. Hitting the net may involve a fileserver
606 * needing to contact us, so we must drop xvcache so we don't block
607 * those requests from going through. */
608 reacquire = *slept = 1;
609 ReleaseWriteLock(&afs_xvcache);
612 /* we now have a pointer to the server, so we just allocate
613 * a queue entry and queue it.
615 tcbp = afs_AllocCBR();
616 tcbp->fid = avc->f.fid.Fid;
618 tcbp->next = tsp->cbrs;
620 tsp->cbrs->pprev = &tcbp->next;
623 tcbp->pprev = &tsp->cbrs;
625 afs_InsertHashCBR(tcbp);
629 /* now release locks and return */
630 ReleaseWriteLock(&afs_xvcb);
633 /* make sure this is after dropping xvcb, for locking order */
634 ObtainWriteLock(&afs_xvcache, 279);
641 * Remove a queued callback for a given Fid.
644 * Locks xvcb and xserver locks.
645 * Typically called with xdcache, xvcache and/or individual vcache
648 * \param afid The fid we want cleansed of queued callbacks.
653 afs_RemoveVCB(struct VenusFid *afid)
656 struct afs_cbr *cbr, *ncbr;
658 AFS_STATCNT(afs_RemoveVCB);
659 ObtainWriteLock(&afs_xvcb, 275);
661 slot = afs_HashCBRFid(&afid->Fid);
662 ncbr = afs_cbrHashT[slot];
666 ncbr = cbr->hash_next;
668 if (afid->Fid.Volume == cbr->fid.Volume &&
669 afid->Fid.Vnode == cbr->fid.Vnode &&
670 afid->Fid.Unique == cbr->fid.Unique) {
675 ReleaseWriteLock(&afs_xvcb);
679 afs_FlushReclaimedVcaches(void)
681 #if !defined(AFS_LINUX22_ENV)
684 struct vcache *tmpReclaimedVCList = NULL;
686 ObtainWriteLock(&afs_xvreclaim, 76);
687 while (ReclaimedVCList) {
688 tvc = ReclaimedVCList; /* take from free list */
689 ReclaimedVCList = tvc->nextfree;
690 tvc->nextfree = NULL;
691 code = afs_FlushVCache(tvc, &fv_slept);
693 /* Ok, so, if we got code != 0, uh, wtf do we do? */
694 /* Probably, build a temporary list and then put all back when we
695 get to the end of the list */
696 /* This is actually really crappy, but we need to not leak these.
697 We probably need a way to be smarter about this. */
698 tvc->nextfree = tmpReclaimedVCList;
699 tmpReclaimedVCList = tvc;
700 /* printf("Reclaim list flush %lx failed: %d\n", (unsigned long) tvc, code); */
702 if (tvc->f.states & (CVInit
703 #ifdef AFS_DARWIN80_ENV
707 tvc->f.states &= ~(CVInit
708 #ifdef AFS_DARWIN80_ENV
712 afs_osi_Wakeup(&tvc->f.states);
715 if (tmpReclaimedVCList)
716 ReclaimedVCList = tmpReclaimedVCList;
718 ReleaseWriteLock(&afs_xvreclaim);
723 afs_PostPopulateVCache(struct vcache *avc, struct VenusFid *afid, int seq)
726 * The proper value for mvstat (for root fids) is setup by the caller.
728 avc->mvstat = AFS_MVSTAT_FILE;
729 if (afid->Fid.Vnode == 1 && afid->Fid.Unique == 1)
730 avc->mvstat = AFS_MVSTAT_ROOT;
732 if (afs_globalVFS == 0)
733 osi_Panic("afs globalvfs");
735 osi_PostPopulateVCache(avc);
738 osi_dnlc_purgedp(avc); /* this may be overkill */
739 memset(&(avc->callsort), 0, sizeof(struct afs_q));
741 avc->f.states &=~ CVInit;
743 avc->f.states |= CBulkFetching;
744 avc->f.m.Length = seq;
746 afs_osi_Wakeup(&avc->f.states);
750 afs_ShakeLooseVCaches(afs_int32 anumber)
755 struct afs_q *tq, *uq;
756 int fv_slept, defersleep = 0;
758 afs_int32 target = anumber;
765 for (tq = VLRU.prev; tq != &VLRU && anumber > 0; tq = uq) {
768 if (tvc->f.states & CVFlushed) {
769 refpanic("CVFlushed on VLRU");
770 } else if (i++ > limit) {
771 afs_warn("afs_ShakeLooseVCaches: i %d limit %d afs_vcount %d afs_maxvcount %d\n",
772 (int)i, limit, (int)afs_vcount, (int)afs_maxvcount);
773 refpanic("Found too many AFS vnodes on VLRU (VLRU cycle?)");
774 } else if (QNext(uq) != tq) {
775 refpanic("VLRU inconsistent");
776 } else if (tvc->f.states & CVInit) {
781 evicted = osi_TryEvictVCache(tvc, &fv_slept, defersleep);
791 * This vcache was busy and we slept while trying to evict it.
792 * Move this busy vcache to the head of the VLRU so vcaches
793 * following this busy vcache can be evicted during the retry.
795 QRemove(&tvc->vlruq);
796 QAdd(&VLRU, &tvc->vlruq);
798 goto retry; /* start over - may have raced. */
801 if (anumber && !defersleep) {
808 if (!afsd_dynamic_vcaches && anumber == target) {
809 afs_warn("afs_ShakeLooseVCaches: warning none freed, using %d of %d\n",
810 afs_vcount, afs_maxvcount);
816 /* Alloc new vnode. */
818 static struct vcache *
819 afs_AllocVCache(void)
823 tvc = osi_NewVnode();
828 if (afsd_dynamic_vcaches && afs_maxvcount < afs_vcount) {
829 afs_maxvcount = afs_vcount;
830 /*printf("peak vnodes: %d\n", afs_maxvcount);*/
833 afs_stats_cmperf.vcacheXAllocs++; /* count in case we have a leak */
835 /* If we create a new inode, we either give it a new slot number,
836 * or if one's available, use a slot number from the slot free list
838 if (afs_freeSlotList != NULL) {
839 struct afs_slotlist *tmp;
841 tvc->diskSlot = afs_freeSlotList->slot;
842 tmp = afs_freeSlotList;
843 afs_freeSlotList = tmp->next;
844 afs_osi_Free(tmp, sizeof(struct afs_slotlist));
846 tvc->diskSlot = afs_nextVcacheSlot++;
852 /* Pre populate a newly allocated vcache. On platforms where the actual
853 * vnode is attached to the vcache, this function is called before attachment,
854 * therefore it cannot perform any actions on the vnode itself */
857 afs_PrePopulateVCache(struct vcache *avc, struct VenusFid *afid,
858 struct server *serverp) {
862 slot = avc->diskSlot;
864 osi_PrePopulateVCache(avc);
866 avc->diskSlot = slot;
867 QZero(&avc->metadirty);
869 AFS_RWLOCK_INIT(&avc->lock, "vcache lock");
871 memset(&avc->mvid, 0, sizeof(avc->mvid));
872 avc->linkData = NULL;
875 avc->execsOrWriters = 0;
877 avc->f.states = CVInit;
878 avc->last_looker = 0;
880 avc->asynchrony = -1;
884 avc->f.truncPos = AFS_NOTRUNC; /* don't truncate until we need to */
886 afs_SetDataVersion(avc, &zero); /* in case we copy it into flushDV */
888 avc->callback = serverp; /* to minimize chance that clear
891 #if defined(AFS_CACHE_BYPASS)
892 avc->cachingStates = 0;
893 avc->cachingTransitions = 0;
898 afs_FlushAllVCaches(void)
901 struct vcache *tvc, *nvc;
903 ObtainWriteLock(&afs_xvcache, 867);
906 for (i = 0; i < VCSIZE; i++) {
907 for (tvc = afs_vhashT[i]; tvc; tvc = nvc) {
911 if (afs_FlushVCache(tvc, &slept)) {
912 afs_warn("Failed to flush vcache 0x%lx\n", (unsigned long)(uintptrsz)tvc);
920 ReleaseWriteLock(&afs_xvcache);
924 * This routine is responsible for allocating a new cache entry
925 * from the free list. It formats the cache entry and inserts it
926 * into the appropriate hash tables. It must be called with
927 * afs_xvcache write-locked so as to prevent several processes from
928 * trying to create a new cache entry simultaneously.
930 * LOCK: afs_NewVCache afs_xvcache W
932 * \param afid The file id of the file whose cache entry is being created.
934 * \return The new vcache struct.
937 static_inline struct vcache *
938 afs_NewVCache_int(struct VenusFid *afid, struct server *serverp, int seq)
942 afs_int32 anumber = VCACHE_FREE;
944 AFS_STATCNT(afs_NewVCache);
946 afs_FlushReclaimedVcaches();
948 #if defined(AFS_LINUX22_ENV)
949 if(!afsd_dynamic_vcaches && afs_vcount >= afs_maxvcount) {
950 afs_ShakeLooseVCaches(anumber);
951 if (afs_vcount >= afs_maxvcount) {
952 afs_warn("afs_NewVCache - none freed\n");
956 tvc = afs_AllocVCache();
957 #else /* AFS_LINUX22_ENV */
958 /* pull out a free cache entry */
960 afs_ShakeLooseVCaches(anumber);
964 tvc = afs_AllocVCache();
966 tvc = freeVCList; /* take from free list */
967 freeVCList = tvc->nextfree;
968 tvc->nextfree = NULL;
969 afs_vcount++; /* balanced by FlushVCache */
970 } /* end of if (!freeVCList) */
972 #endif /* AFS_LINUX22_ENV */
974 #if defined(AFS_XBSD_ENV) || defined(AFS_DARWIN_ENV)
976 panic("afs_NewVCache(): free vcache with vnode attached");
979 /* Populate the vcache with as much as we can. */
980 afs_PrePopulateVCache(tvc, afid, serverp);
982 /* Thread the vcache onto the VLRU */
987 tvc->hnext = afs_vhashT[i];
989 QAdd(&afs_vhashTV[j], &tvc->vhashq);
991 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
992 refpanic("NewVCache VLRU inconsistent");
994 QAdd(&VLRU, &tvc->vlruq); /* put in lruq */
995 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
996 refpanic("NewVCache VLRU inconsistent2");
998 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
999 refpanic("NewVCache VLRU inconsistent3");
1001 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
1002 refpanic("NewVCache VLRU inconsistent4");
1006 /* it should now be safe to drop the xvcache lock - so attach an inode
1007 * to this vcache, where necessary */
1008 osi_AttachVnode(tvc, seq);
1010 /* Get a reference count to hold this vcache for the VLRUQ. Note that
1011 * we have to do this after attaching the vnode, because the reference
1012 * count may be held in the vnode itself */
1014 #if defined(AFS_LINUX22_ENV)
1015 /* Hold it for the LRU (should make count 2) */
1017 #elif !(defined (AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV))
1018 VREFCOUNT_SET(tvc, 1); /* us */
1021 #if defined (AFS_FBSD_ENV)
1022 if (tvc->f.states & CVInit)
1024 afs_PostPopulateVCache(tvc, afid, seq);
1027 } /*afs_NewVCache */
1031 afs_NewVCache(struct VenusFid *afid, struct server *serverp)
1033 return afs_NewVCache_int(afid, serverp, 0);
1037 afs_NewBulkVCache(struct VenusFid *afid, struct server *serverp, int seq)
1039 return afs_NewVCache_int(afid, serverp, seq);
1045 * LOCK: afs_FlushActiveVcaches afs_xvcache N
1047 * \param doflocks : Do we handle flocks?
1050 afs_FlushActiveVcaches(afs_int32 doflocks)
1054 struct afs_conn *tc;
1056 afs_ucred_t *cred = NULL;
1057 struct vrequest *treq = NULL;
1058 struct AFSVolSync tsync;
1061 AFS_STATCNT(afs_FlushActiveVcaches);
1063 code = afs_CreateReq(&treq, afs_osi_credp);
1065 afs_warn("unable to alloc treq\n");
1069 ObtainReadLock(&afs_xvcache);
1070 for (i = 0; i < VCSIZE; i++) {
1071 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
1072 if (tvc->f.states & CVInit) continue;
1073 #ifdef AFS_DARWIN80_ENV
1074 if (tvc->f.states & CDeadVnode &&
1075 (tvc->f.states & (CCore|CUnlinkedDel) ||
1076 tvc->flockCount)) panic("Dead vnode has core/unlinkedel/flock");
1078 if (doflocks && tvc->flockCount != 0) {
1079 struct rx_connection *rxconn;
1080 /* if this entry has an flock, send a keep-alive call out */
1082 ReleaseReadLock(&afs_xvcache);
1083 ObtainWriteLock(&tvc->lock, 51);
1085 code = afs_InitReq(treq, afs_osi_credp);
1088 break; /* shutting down: do not try to extend the lock */
1090 treq->flags |= O_NONBLOCK;
1092 tc = afs_Conn(&tvc->f.fid, treq, SHARED_LOCK, &rxconn);
1094 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_EXTENDLOCK);
1097 RXAFS_ExtendLock(rxconn,
1098 (struct AFSFid *)&tvc->f.fid.Fid,
1104 } while (afs_Analyze
1105 (tc, rxconn, code, &tvc->f.fid, treq,
1106 AFS_STATS_FS_RPCIDX_EXTENDLOCK, SHARED_LOCK, NULL));
1108 ReleaseWriteLock(&tvc->lock);
1109 #ifdef AFS_DARWIN80_ENV
1111 ObtainReadLock(&afs_xvcache);
1113 ObtainReadLock(&afs_xvcache);
1118 if ((tvc->f.states & CCore) || (tvc->f.states & CUnlinkedDel)) {
1120 * Don't let it evaporate in case someone else is in
1121 * this code. Also, drop the afs_xvcache lock while
1122 * getting vcache locks.
1125 ReleaseReadLock(&afs_xvcache);
1126 #if defined(AFS_SGI_ENV)
1128 * That's because if we come in via the CUnlinkedDel bit state path we'll be have 0 refcnt
1130 osi_Assert(VREFCOUNT_GT(tvc,0));
1131 AFS_RWLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1133 ObtainWriteLock(&tvc->lock, 52);
1134 if (tvc->f.states & CCore) {
1135 tvc->f.states &= ~CCore;
1136 /* XXXX Find better place-holder for cred XXXX */
1137 cred = (afs_ucred_t *)tvc->linkData;
1138 tvc->linkData = NULL; /* XXX */
1139 code = afs_InitReq(treq, cred);
1140 afs_Trace2(afs_iclSetp, CM_TRACE_ACTCCORE,
1141 ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32,
1142 tvc->execsOrWriters);
1143 if (!code) { /* avoid store when shutting down */
1144 code = afs_StoreOnLastReference(tvc, treq);
1146 ReleaseWriteLock(&tvc->lock);
1147 hzero(tvc->flushDV);
1150 if (code && code != VNOVNODE) {
1151 afs_StoreWarn(code, tvc->f.fid.Fid.Volume,
1152 /* /dev/console */ 1);
1154 } else if (tvc->f.states & CUnlinkedDel) {
1158 ReleaseWriteLock(&tvc->lock);
1159 #if defined(AFS_SGI_ENV)
1160 AFS_RWUNLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1162 afs_remunlink(tvc, 0);
1163 #if defined(AFS_SGI_ENV)
1164 AFS_RWLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1167 /* lost (or won, perhaps) the race condition */
1168 ReleaseWriteLock(&tvc->lock);
1170 #if defined(AFS_SGI_ENV)
1171 AFS_RWUNLOCK((vnode_t *) tvc, VRWLOCK_WRITE);
1173 #ifdef AFS_DARWIN80_ENV
1176 AFS_RELE(AFSTOV(tvc));
1177 /* Matches write code setting CCore flag */
1180 ObtainReadLock(&afs_xvcache);
1182 ObtainReadLock(&afs_xvcache);
1185 AFS_RELE(AFSTOV(tvc));
1186 /* Matches write code setting CCore flag */
1193 ReleaseReadLock(&afs_xvcache);
1194 afs_DestroyReq(treq);
1200 * Make sure a cache entry is up-to-date status-wise.
1202 * NOTE: everywhere that calls this can potentially be sped up
1203 * by checking CStatd first, and avoiding doing the InitReq
1204 * if this is up-to-date.
1206 * Anymore, the only places that call this KNOW already that the
1207 * vcache is not up-to-date, so we don't screw around.
1209 * \param avc : Ptr to vcache entry to verify.
1215 * Make sure a cache entry is up-to-date status-wise.
1217 * NOTE: everywhere that calls this can potentially be sped up
1218 * by checking CStatd first, and avoiding doing the InitReq
1219 * if this is up-to-date.
1221 * Anymore, the only places that call this KNOW already that the
1222 * vcache is not up-to-date, so we don't screw around.
1224 * \param avc Pointer to vcache entry to verify.
1227 * \return 0 for success or other error codes.
1230 afs_VerifyVCache2(struct vcache *avc, struct vrequest *areq)
1234 AFS_STATCNT(afs_VerifyVCache);
1236 /* otherwise we must fetch the status info */
1238 ObtainWriteLock(&avc->lock, 53);
1239 if (avc->f.states & CStatd) {
1240 ReleaseWriteLock(&avc->lock);
1243 afs_StaleVCacheFlags(avc, AFS_STALEVC_FILENAME | AFS_STALEVC_CLEARCB,
1245 ReleaseWriteLock(&avc->lock);
1247 /* fetch the status info */
1248 tvc = afs_GetVCache(&avc->f.fid, areq);
1251 /* Put it back; caller has already incremented vrefCount */
1255 } /*afs_VerifyVCache */
1259 * Simple copy of stat info into cache.
1261 * Callers:as of 1992-04-29, only called by WriteVCache
1263 * \param avc Ptr to vcache entry involved.
1264 * \param astat Ptr to stat info to copy.
1268 afs_SimpleVStat(struct vcache *avc,
1269 struct AFSFetchStatus *astat, struct vrequest *areq)
1272 AFS_STATCNT(afs_SimpleVStat);
1274 #ifdef AFS_64BIT_CLIENT
1275 FillInt64(length, astat->Length_hi, astat->Length);
1276 #else /* AFS_64BIT_CLIENT */
1277 length = astat->Length;
1278 #endif /* AFS_64BIT_CLIENT */
1280 #if defined(AFS_SGI_ENV)
1281 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)
1282 && !AFS_VN_MAPPED((vnode_t *) avc)) {
1283 osi_Assert((valusema(&avc->vc_rwlock) <= 0)
1284 && (OSI_GET_LOCKID() == avc->vc_rwlockid));
1285 if (length < avc->f.m.Length) {
1286 vnode_t *vp = (vnode_t *) avc;
1288 osi_Assert(WriteLocked(&avc->lock));
1289 ReleaseWriteLock(&avc->lock);
1291 PTOSSVP(vp, (off_t) length, (off_t) MAXLONG);
1293 ObtainWriteLock(&avc->lock, 67);
1298 if (!afs_DirtyPages(avc)) {
1299 /* if actively writing the file, don't fetch over this value */
1300 afs_Trace3(afs_iclSetp, CM_TRACE_SIMPLEVSTAT, ICL_TYPE_POINTER, avc,
1301 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length),
1302 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length));
1303 avc->f.m.Length = length;
1304 avc->f.m.Date = astat->ClientModTime;
1306 avc->f.m.Owner = astat->Owner;
1307 avc->f.m.Group = astat->Group;
1308 avc->f.m.Mode = astat->UnixModeBits;
1309 if (vType(avc) == VREG) {
1310 avc->f.m.Mode |= S_IFREG;
1311 } else if (vType(avc) == VDIR) {
1312 avc->f.m.Mode |= S_IFDIR;
1313 } else if (vType(avc) == VLNK) {
1314 avc->f.m.Mode |= S_IFLNK;
1315 if ((avc->f.m.Mode & 0111) == 0)
1316 avc->mvstat = AFS_MVSTAT_MTPT;
1318 if (avc->f.states & CForeign) {
1319 struct axscache *ac;
1320 avc->f.anyAccess = astat->AnonymousAccess;
1322 if ((astat->CallerAccess & ~astat->AnonymousAccess))
1324 * Caller has at least one bit not covered by anonymous, and
1325 * thus may have interesting rights.
1327 * HOWEVER, this is a really bad idea, because any access query
1328 * for bits which aren't covered by anonymous, on behalf of a user
1329 * who doesn't have any special rights, will result in an answer of
1330 * the form "I don't know, lets make a FetchStatus RPC and find out!"
1331 * It's an especially bad idea under Ultrix, since (due to the lack of
1332 * a proper access() call) it must perform several afs_access() calls
1333 * in order to create magic mode bits that vary according to who makes
1334 * the call. In other words, _every_ stat() generates a test for
1337 #endif /* badidea */
1338 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
1339 ac->axess = astat->CallerAccess;
1340 else /* not found, add a new one if possible */
1341 afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess);
1344 } /*afs_SimpleVStat */
1348 * Store the status info *only* back to the server for a
1351 * Environment: Must be called with a shared lock held on the vnode.
1353 * \param avc Ptr to the vcache entry.
1354 * \param astatus Ptr to the status info to store.
1355 * \param areq Ptr to the associated vrequest.
1357 * \return Operation status.
1361 afs_WriteVCache(struct vcache *avc,
1362 struct AFSStoreStatus *astatus,
1363 struct vrequest *areq)
1366 struct afs_conn *tc;
1367 struct AFSFetchStatus OutStatus;
1368 struct AFSVolSync tsync;
1369 struct rx_connection *rxconn;
1371 AFS_STATCNT(afs_WriteVCache);
1372 afs_Trace2(afs_iclSetp, CM_TRACE_WVCACHE, ICL_TYPE_POINTER, avc,
1373 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
1375 tc = afs_Conn(&avc->f.fid, areq, SHARED_LOCK, &rxconn);
1377 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_STORESTATUS);
1380 RXAFS_StoreStatus(rxconn, (struct AFSFid *)&avc->f.fid.Fid,
1381 astatus, &OutStatus, &tsync);
1386 } while (afs_Analyze
1387 (tc, rxconn, code, &avc->f.fid, areq, AFS_STATS_FS_RPCIDX_STORESTATUS,
1388 SHARED_LOCK, NULL));
1390 UpgradeSToWLock(&avc->lock, 20);
1392 /* success, do the changes locally */
1393 afs_SimpleVStat(avc, &OutStatus, areq);
1395 * Update the date, too. SimpleVStat didn't do this, since
1396 * it thought we were doing this after fetching new status
1397 * over a file being written.
1399 avc->f.m.Date = OutStatus.ClientModTime;
1401 /* failure, set up to check with server next time */
1402 afs_StaleVCacheFlags(avc, 0, CUnique);
1404 ConvertWToSLock(&avc->lock);
1407 } /*afs_WriteVCache */
1410 * Store status info only locally, set the proper disconnection flags
1411 * and add to dirty list.
1413 * \param avc The vcache to be written locally.
1414 * \param astatus Get attr fields from local store.
1415 * \param attrs This one is only of the vs_size.
1417 * \note Must be called with a shared lock on the vnode
1420 afs_WriteVCacheDiscon(struct vcache *avc,
1421 struct AFSStoreStatus *astatus,
1422 struct vattr *attrs)
1425 afs_int32 flags = 0;
1427 UpgradeSToWLock(&avc->lock, 700);
1429 if (!astatus->Mask) {
1435 /* Set attributes. */
1436 if (astatus->Mask & AFS_SETMODTIME) {
1437 avc->f.m.Date = astatus->ClientModTime;
1438 flags |= VDisconSetTime;
1441 if (astatus->Mask & AFS_SETOWNER) {
1442 /* printf("Not allowed yet. \n"); */
1443 /*avc->f.m.Owner = astatus->Owner;*/
1446 if (astatus->Mask & AFS_SETGROUP) {
1447 /* printf("Not allowed yet. \n"); */
1448 /*avc->f.m.Group = astatus->Group;*/
1451 if (astatus->Mask & AFS_SETMODE) {
1452 avc->f.m.Mode = astatus->UnixModeBits;
1454 flags |= VDisconSetMode;
1455 } /* if(astatus.Mask & AFS_SETMODE) */
1457 } /* if (!astatus->Mask) */
1459 if (attrs->va_size > 0) {
1460 /* XXX: Do I need more checks? */
1461 /* Truncation operation. */
1462 flags |= VDisconTrunc;
1466 afs_DisconAddDirty(avc, flags, 1);
1468 /* XXX: How about the rest of the fields? */
1470 ConvertWToSLock(&avc->lock);
1476 * Copy astat block into vcache info
1478 * \note This code may get dataversion and length out of sync if the file has
1479 * been modified. This is less than ideal. I haven't thought about it sufficiently
1480 * to be certain that it is adequate.
1482 * \note Environment: Must be called under a write lock
1484 * \param avc Ptr to vcache entry.
1485 * \param astat Ptr to stat block to copy in.
1486 * \param areq Ptr to associated request.
1489 afs_ProcessFS(struct vcache *avc,
1490 struct AFSFetchStatus *astat, struct vrequest *areq)
1494 AFS_STATCNT(afs_ProcessFS);
1496 #ifdef AFS_64BIT_CLIENT
1497 FillInt64(length, astat->Length_hi, astat->Length);
1498 #else /* AFS_64BIT_CLIENT */
1499 length = astat->Length;
1500 #endif /* AFS_64BIT_CLIENT */
1501 /* WARNING: afs_DoBulkStat uses the Length field to store a sequence
1502 * number for each bulk status request. Under no circumstances
1503 * should afs_DoBulkStat store a sequence number if the new
1504 * length will be ignored when afs_ProcessFS is called with
1505 * new stats. If you change the following conditional then you
1506 * also need to change the conditional in afs_DoBulkStat. */
1508 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)
1509 && !AFS_VN_MAPPED((vnode_t *) avc)) {
1511 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)) {
1513 /* if we're writing or mapping this file, don't fetch over these
1516 afs_Trace3(afs_iclSetp, CM_TRACE_PROCESSFS, ICL_TYPE_POINTER, avc,
1517 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length),
1518 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length));
1519 avc->f.m.Length = length;
1520 avc->f.m.Date = astat->ClientModTime;
1522 hset64(newDV, astat->dataVersionHigh, astat->DataVersion);
1523 afs_SetDataVersion(avc, &newDV);
1524 avc->f.m.Owner = astat->Owner;
1525 avc->f.m.Mode = astat->UnixModeBits;
1526 avc->f.m.Group = astat->Group;
1527 avc->f.m.LinkCount = astat->LinkCount;
1528 if (astat->FileType == File) {
1529 vSetType(avc, VREG);
1530 avc->f.m.Mode |= S_IFREG;
1531 } else if (astat->FileType == Directory) {
1532 vSetType(avc, VDIR);
1533 avc->f.m.Mode |= S_IFDIR;
1534 } else if (astat->FileType == SymbolicLink) {
1535 if (afs_fakestat_enable && (avc->f.m.Mode & 0111) == 0) {
1536 vSetType(avc, VDIR);
1537 avc->f.m.Mode |= S_IFDIR;
1539 vSetType(avc, VLNK);
1540 avc->f.m.Mode |= S_IFLNK;
1542 if ((avc->f.m.Mode & 0111) == 0) {
1543 avc->mvstat = AFS_MVSTAT_MTPT;
1546 avc->f.anyAccess = astat->AnonymousAccess;
1548 if ((astat->CallerAccess & ~astat->AnonymousAccess))
1550 * Caller has at least one bit not covered by anonymous, and
1551 * thus may have interesting rights.
1553 * HOWEVER, this is a really bad idea, because any access query
1554 * for bits which aren't covered by anonymous, on behalf of a user
1555 * who doesn't have any special rights, will result in an answer of
1556 * the form "I don't know, lets make a FetchStatus RPC and find out!"
1557 * It's an especially bad idea under Ultrix, since (due to the lack of
1558 * a proper access() call) it must perform several afs_access() calls
1559 * in order to create magic mode bits that vary according to who makes
1560 * the call. In other words, _every_ stat() generates a test for
1563 #endif /* badidea */
1565 struct axscache *ac;
1566 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
1567 ac->axess = astat->CallerAccess;
1568 else /* not found, add a new one if possible */
1569 afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess);
1571 } /*afs_ProcessFS */
1575 * Get fid from server.
1578 * \param areq Request to be passed on.
1579 * \param name Name of ?? to lookup.
1580 * \param OutStatus Fetch status.
1585 * \return Success status of operation.
1588 afs_RemoteLookup(struct VenusFid *afid, struct vrequest *areq,
1589 char *name, struct VenusFid *nfid,
1590 struct AFSFetchStatus *OutStatusp,
1591 struct AFSCallBack *CallBackp, struct server **serverp,
1592 struct AFSVolSync *tsyncp)
1595 struct afs_conn *tc;
1596 struct rx_connection *rxconn;
1597 struct AFSFetchStatus OutDirStatus;
1600 name = ""; /* XXX */
1602 tc = afs_Conn(afid, areq, SHARED_LOCK, &rxconn);
1605 *serverp = tc->parent->srvr->server;
1606 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_XLOOKUP);
1609 RXAFS_Lookup(rxconn, (struct AFSFid *)&afid->Fid, name,
1610 (struct AFSFid *)&nfid->Fid, OutStatusp,
1611 &OutDirStatus, CallBackp, tsyncp);
1616 } while (afs_Analyze
1617 (tc, rxconn, code, afid, areq, AFS_STATS_FS_RPCIDX_XLOOKUP, SHARED_LOCK,
1627 * Given a file id and a vrequest structure, fetch the status
1628 * information associated with the file.
1630 * \param afid File ID.
1631 * \param areq Ptr to associated vrequest structure, specifying the
1632 * user whose authentication tokens will be used.
1634 * \note Environment:
1635 * The cache entry is returned with an increased vrefCount field.
1636 * The entry must be discarded by calling afs_PutVCache when you
1637 * are through using the pointer to the cache entry.
1639 * You should not hold any locks when calling this function, except
1640 * locks on other vcache entries. If you lock more than one vcache
1641 * entry simultaneously, you should lock them in this order:
1643 * 1. Lock all files first, then directories.
1644 * 2. Within a particular type, lock entries in Fid.Vnode order.
1646 * This locking hierarchy is convenient because it allows locking
1647 * of a parent dir cache entry, given a file (to check its access
1648 * control list). It also allows renames to be handled easily by
1649 * locking directories in a constant order.
1651 * \note NB. NewVCache -> FlushVCache presently (4/10/95) drops the xvcache lock.
1654 afs_GetVCache(struct VenusFid *afid, struct vrequest *areq)
1657 afs_int32 code, newvcache = 0;
1662 AFS_STATCNT(afs_GetVCache);
1664 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1668 ObtainSharedLock(&afs_xvcache, 5);
1670 tvc = afs_FindVCache(afid, &retry, DO_STATS | DO_VLRU | IS_SLOCK);
1672 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1673 ReleaseSharedLock(&afs_xvcache);
1674 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1679 osi_Assert((tvc->f.states & CVInit) == 0);
1680 /* If we are in readdir, return the vnode even if not statd */
1681 if ((tvc->f.states & CStatd) || afs_InReadDir(tvc)) {
1682 ReleaseSharedLock(&afs_xvcache);
1686 UpgradeSToWLock(&afs_xvcache, 21);
1688 /* no cache entry, better grab one */
1689 tvc = afs_NewVCache(afid, NULL);
1692 ConvertWToSLock(&afs_xvcache);
1695 ReleaseSharedLock(&afs_xvcache);
1699 afs_stats_cmperf.vcacheMisses++;
1702 ReleaseSharedLock(&afs_xvcache);
1704 ObtainWriteLock(&tvc->lock, 54);
1706 if (tvc->f.states & CStatd) {
1707 ReleaseWriteLock(&tvc->lock);
1710 #ifdef AFS_DARWIN80_ENV
1711 /* Darwin 8.0 only has bufs in nfs, so we shouldn't have to worry about them.
1714 #if defined(AFS_DARWIN_ENV) || defined(AFS_FBSD_ENV)
1716 * XXX - I really don't like this. Should try to understand better.
1717 * It seems that sometimes, when we get called, we already hold the
1718 * lock on the vnode (e.g., from afs_getattr via afs_VerifyVCache).
1719 * We can't drop the vnode lock, because that could result in a race.
1720 * Sometimes, though, we get here and don't hold the vnode lock.
1721 * I hate code paths that sometimes hold locks and sometimes don't.
1722 * In any event, the dodge we use here is to check whether the vnode
1723 * is locked, and if it isn't, then we gain and drop it around the call
1724 * to vinvalbuf; otherwise, we leave it alone.
1727 struct vnode *vp = AFSTOV(tvc);
1730 #if defined(AFS_DARWIN_ENV)
1731 iheldthelock = VOP_ISLOCKED(vp);
1733 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, current_proc());
1734 /* this is messy. we can call fsync which will try to reobtain this */
1735 if (VTOAFS(vp) == tvc)
1736 ReleaseWriteLock(&tvc->lock);
1737 if (UBCINFOEXISTS(vp)) {
1738 vinvalbuf(vp, V_SAVE, &afs_osi_cred, current_proc(), PINOD, 0);
1740 if (VTOAFS(vp) == tvc)
1741 ObtainWriteLock(&tvc->lock, 954);
1743 VOP_UNLOCK(vp, LK_EXCLUSIVE, current_proc());
1744 #elif defined(AFS_FBSD80_ENV)
1745 iheldthelock = VOP_ISLOCKED(vp);
1746 if (!iheldthelock) {
1747 /* nosleep/sleep lock order reversal */
1748 int glocked = ISAFS_GLOCK();
1751 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1755 vinvalbuf(vp, V_SAVE, PINOD, 0); /* changed late in 8.0-CURRENT */
1758 #elif defined(AFS_FBSD60_ENV)
1759 iheldthelock = VOP_ISLOCKED(vp, curthread);
1761 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
1763 vinvalbuf(vp, V_SAVE, curthread, PINOD, 0);
1766 VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread);
1767 #elif defined(AFS_FBSD_ENV)
1768 iheldthelock = VOP_ISLOCKED(vp, curthread);
1770 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
1771 vinvalbuf(vp, V_SAVE, osi_curcred(), curthread, PINOD, 0);
1773 VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread);
1774 #elif defined(AFS_OBSD_ENV)
1775 iheldthelock = VOP_ISLOCKED(vp, curproc);
1777 VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY, curproc);
1778 uvm_vnp_uncache(vp);
1780 VOP_UNLOCK(vp, 0, curproc);
1781 #elif defined(AFS_NBSD40_ENV)
1782 iheldthelock = VOP_ISLOCKED(vp);
1783 if (!iheldthelock) {
1784 VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1786 uvm_vnp_uncache(vp);
1794 afs_StaleVCacheFlags(tvc, AFS_STALEVC_NODNLC | AFS_STALEVC_CLEARCB,
1797 /* It is always appropriate to throw away all the access rights? */
1798 afs_FreeAllAxs(&(tvc->Access));
1799 tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-volume info */
1801 if ((tvp->states & VForeign)) {
1803 tvc->f.states |= CForeign;
1804 if (newvcache && (tvp->rootVnode == afid->Fid.Vnode)
1805 && (tvp->rootUnique == afid->Fid.Unique)) {
1806 tvc->mvstat = AFS_MVSTAT_ROOT;
1809 if (tvp->states & VRO)
1810 tvc->f.states |= CRO;
1811 if (tvp->states & VBackup)
1812 tvc->f.states |= CBackup;
1813 /* now copy ".." entry back out of volume structure, if necessary */
1814 if (tvc->mvstat == AFS_MVSTAT_ROOT && tvp->dotdot.Fid.Volume != 0) {
1815 if (!tvc->mvid.parent)
1816 tvc->mvid.parent = (struct VenusFid *)
1817 osi_AllocSmallSpace(sizeof(struct VenusFid));
1818 *tvc->mvid.parent = tvp->dotdot;
1820 afs_PutVolume(tvp, READ_LOCK);
1824 afs_RemoveVCB(afid);
1826 struct AFSFetchStatus OutStatus;
1828 if (afs_DynrootNewVnode(tvc, &OutStatus)) {
1829 afs_ProcessFS(tvc, &OutStatus, areq);
1830 tvc->f.states |= CStatd | CUnique;
1831 tvc->f.parent.vnode = OutStatus.ParentVnode;
1832 tvc->f.parent.unique = OutStatus.ParentUnique;
1836 if (AFS_IS_DISCONNECTED) {
1837 /* Nothing to do otherwise...*/
1839 /* printf("Network is down in afs_GetCache"); */
1841 code = afs_FetchStatus(tvc, afid, areq, &OutStatus);
1843 /* For the NFS translator's benefit, make sure
1844 * non-directory vnodes always have their parent FID set
1845 * correctly, even when created as a result of decoding an
1846 * NFS filehandle. It would be nice to also do this for
1847 * directories, but we can't because the fileserver fills
1848 * in the FID of the directory itself instead of that of
1851 if (!code && OutStatus.FileType != Directory &&
1852 !tvc->f.parent.vnode) {
1853 tvc->f.parent.vnode = OutStatus.ParentVnode;
1854 tvc->f.parent.unique = OutStatus.ParentUnique;
1855 /* XXX - SXW - It's conceivable we should mark ourselves
1856 * as dirty again here, incase we've been raced
1857 * out of the FetchStatus call.
1864 ReleaseWriteLock(&tvc->lock);
1870 ReleaseWriteLock(&tvc->lock);
1873 } /*afs_GetVCache */
1878 * Lookup a vcache by fid. Look inside the cache first, if not
1879 * there, lookup the file on the server, and then get it's fresh
1887 * \return The found element or NULL.
1890 afs_LookupVCache(struct VenusFid *afid, struct vrequest *areq,
1891 struct vcache *adp, char *aname)
1893 afs_int32 code, now, newvcache = 0;
1894 struct VenusFid nfid;
1897 struct AFSFetchStatus OutStatus;
1898 struct AFSCallBack CallBack;
1899 struct AFSVolSync tsync;
1900 struct server *serverp = 0;
1904 AFS_STATCNT(afs_GetVCache);
1906 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1910 ObtainReadLock(&afs_xvcache);
1911 tvc = afs_FindVCache(afid, &retry, DO_STATS /* no vlru */ );
1914 ReleaseReadLock(&afs_xvcache);
1916 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1917 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1921 ObtainReadLock(&tvc->lock);
1923 if (tvc->f.states & CStatd) {
1924 ReleaseReadLock(&tvc->lock);
1927 tvc->f.states &= ~CUnique;
1929 ReleaseReadLock(&tvc->lock);
1931 ObtainReadLock(&afs_xvcache);
1934 ReleaseReadLock(&afs_xvcache);
1936 /* lookup the file */
1939 origCBs = afs_allCBs; /* if anything changes, we don't have a cb */
1941 if (AFS_IS_DISCONNECTED) {
1942 /* printf("Network is down in afs_LookupVcache\n"); */
1946 afs_RemoteLookup(&adp->f.fid, areq, aname, &nfid, &OutStatus,
1947 &CallBack, &serverp, &tsync);
1949 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1953 ObtainSharedLock(&afs_xvcache, 6);
1954 tvc = afs_FindVCache(&nfid, &retry, DO_VLRU | IS_SLOCK/* no xstats now */ );
1956 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1957 ReleaseSharedLock(&afs_xvcache);
1958 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1964 /* no cache entry, better grab one */
1965 UpgradeSToWLock(&afs_xvcache, 22);
1966 tvc = afs_NewVCache(&nfid, serverp);
1968 ConvertWToSLock(&afs_xvcache);
1971 ReleaseSharedLock(&afs_xvcache);
1976 ReleaseSharedLock(&afs_xvcache);
1977 ObtainWriteLock(&tvc->lock, 55);
1979 /* It is always appropriate to throw away all the access rights? */
1980 afs_FreeAllAxs(&(tvc->Access));
1981 tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-vol info */
1983 if ((tvp->states & VForeign)) {
1985 tvc->f.states |= CForeign;
1986 if (newvcache && (tvp->rootVnode == afid->Fid.Vnode)
1987 && (tvp->rootUnique == afid->Fid.Unique))
1988 tvc->mvstat = AFS_MVSTAT_ROOT;
1990 if (tvp->states & VRO)
1991 tvc->f.states |= CRO;
1992 if (tvp->states & VBackup)
1993 tvc->f.states |= CBackup;
1994 /* now copy ".." entry back out of volume structure, if necessary */
1995 if (tvc->mvstat == AFS_MVSTAT_ROOT && tvp->dotdot.Fid.Volume != 0) {
1996 if (!tvc->mvid.parent)
1997 tvc->mvid.parent = (struct VenusFid *)
1998 osi_AllocSmallSpace(sizeof(struct VenusFid));
1999 *tvc->mvid.parent = tvp->dotdot;
2004 afs_StaleVCacheFlags(tvc, 0, CUnique);
2006 afs_PutVolume(tvp, READ_LOCK);
2007 ReleaseWriteLock(&tvc->lock);
2012 ObtainWriteLock(&afs_xcbhash, 466);
2013 if (origCBs == afs_allCBs) {
2014 if (CallBack.ExpirationTime) {
2015 tvc->callback = serverp;
2016 tvc->cbExpires = CallBack.ExpirationTime + now;
2017 tvc->f.states |= CStatd | CUnique;
2018 tvc->f.states &= ~CBulkFetching;
2019 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvp);
2020 } else if (tvc->f.states & CRO) {
2021 /* adapt gives us an hour. */
2022 tvc->cbExpires = 3600 + osi_Time();
2023 /*XXX*/ tvc->f.states |= CStatd | CUnique;
2024 tvc->f.states &= ~CBulkFetching;
2025 afs_QueueCallback(tvc, CBHash(3600), tvp);
2027 afs_StaleVCacheFlags(tvc,
2028 AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB,
2032 afs_StaleVCacheFlags(tvc,
2033 AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB,
2036 ReleaseWriteLock(&afs_xcbhash);
2038 afs_PutVolume(tvp, READ_LOCK);
2039 afs_ProcessFS(tvc, &OutStatus, areq);
2041 ReleaseWriteLock(&tvc->lock);
2047 afs_GetRootVCache(struct VenusFid *afid, struct vrequest *areq,
2048 struct volume *tvolp)
2050 afs_int32 code = 0, i, newvcache = 0, haveStatus = 0;
2051 afs_int32 getNewFid = 0;
2053 struct VenusFid nfid;
2055 struct server *serverp = 0;
2056 struct AFSFetchStatus OutStatus;
2057 struct AFSCallBack CallBack;
2058 struct AFSVolSync tsync;
2060 #ifdef AFS_DARWIN80_ENV
2067 if (!tvolp->rootVnode || getNewFid) {
2068 struct VenusFid tfid;
2071 tfid.Fid.Vnode = 0; /* Means get rootfid of volume */
2072 origCBs = afs_allCBs; /* ignore InitCallBackState */
2074 afs_RemoteLookup(&tfid, areq, NULL, &nfid, &OutStatus, &CallBack,
2079 /* ReleaseReadLock(&tvolp->lock); */
2080 ObtainWriteLock(&tvolp->lock, 56);
2081 tvolp->rootVnode = afid->Fid.Vnode = nfid.Fid.Vnode;
2082 tvolp->rootUnique = afid->Fid.Unique = nfid.Fid.Unique;
2083 ReleaseWriteLock(&tvolp->lock);
2084 /* ObtainReadLock(&tvolp->lock);*/
2087 afid->Fid.Vnode = tvolp->rootVnode;
2088 afid->Fid.Unique = tvolp->rootUnique;
2092 ObtainSharedLock(&afs_xvcache, 7);
2094 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2095 if (!FidCmp(&(tvc->f.fid), afid)) {
2096 if (tvc->f.states & CVInit) {
2097 ReleaseSharedLock(&afs_xvcache);
2098 afs_osi_Sleep(&tvc->f.states);
2101 #ifdef AFS_DARWIN80_ENV
2102 if (tvc->f.states & CDeadVnode) {
2103 ReleaseSharedLock(&afs_xvcache);
2104 afs_osi_Sleep(&tvc->f.states);
2108 if (vnode_get(tvp)) /* this bumps ref count */
2110 if (vnode_ref(tvp)) {
2112 /* AFSTOV(tvc) may be NULL */
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++;
2150 afs_stats_cmperf.vcacheHits++;
2151 #if defined(AFS_DARWIN80_ENV)
2152 /* we already bumped the ref count in the for loop above */
2153 #else /* AFS_DARWIN80_ENV */
2156 UpgradeSToWLock(&afs_xvcache, 24);
2157 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2158 refpanic("GRVC VLRU inconsistent0");
2160 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2161 refpanic("GRVC VLRU inconsistent1");
2163 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2164 refpanic("GRVC VLRU inconsistent2");
2166 QRemove(&tvc->vlruq); /* move to lruq head */
2167 QAdd(&VLRU, &tvc->vlruq);
2168 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2169 refpanic("GRVC VLRU inconsistent3");
2171 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2172 refpanic("GRVC VLRU inconsistent4");
2174 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2175 refpanic("GRVC VLRU inconsistent5");
2180 ReleaseWriteLock(&afs_xvcache);
2182 if (tvc->f.states & CStatd) {
2186 ObtainReadLock(&tvc->lock);
2187 tvc->f.states &= ~CUnique;
2188 tvc->callback = NULL; /* redundant, perhaps */
2189 ReleaseReadLock(&tvc->lock);
2192 ObtainWriteLock(&tvc->lock, 57);
2194 /* It is always appropriate to throw away all the access rights? */
2195 afs_FreeAllAxs(&(tvc->Access));
2198 tvc->f.states |= CForeign;
2199 if (tvolp->states & VRO)
2200 tvc->f.states |= CRO;
2201 if (tvolp->states & VBackup)
2202 tvc->f.states |= CBackup;
2203 /* now copy ".." entry back out of volume structure, if necessary */
2204 if (newvcache && (tvolp->rootVnode == afid->Fid.Vnode)
2205 && (tvolp->rootUnique == afid->Fid.Unique)) {
2206 tvc->mvstat = AFS_MVSTAT_ROOT;
2208 if (tvc->mvstat == AFS_MVSTAT_ROOT && tvolp->dotdot.Fid.Volume != 0) {
2209 if (!tvc->mvid.parent)
2210 tvc->mvid.parent = (struct VenusFid *)
2211 osi_AllocSmallSpace(sizeof(struct VenusFid));
2212 *tvc->mvid.parent = tvolp->dotdot;
2216 afs_RemoveVCB(afid);
2219 struct VenusFid tfid;
2222 tfid.Fid.Vnode = 0; /* Means get rootfid of volume */
2223 origCBs = afs_allCBs; /* ignore InitCallBackState */
2225 afs_RemoteLookup(&tfid, areq, NULL, &nfid, &OutStatus, &CallBack,
2230 afs_StaleVCacheFlags(tvc, AFS_STALEVC_CLEARCB, CUnique);
2231 ReleaseWriteLock(&tvc->lock);
2236 ObtainWriteLock(&afs_xcbhash, 468);
2237 if (origCBs == afs_allCBs) {
2238 tvc->f.states |= CTruth;
2239 tvc->callback = serverp;
2240 if (CallBack.ExpirationTime != 0) {
2241 tvc->cbExpires = CallBack.ExpirationTime + start;
2242 tvc->f.states |= CStatd;
2243 tvc->f.states &= ~CBulkFetching;
2244 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvolp);
2245 } else if (tvc->f.states & CRO) {
2246 /* adapt gives us an hour. */
2247 tvc->cbExpires = 3600 + osi_Time();
2248 /*XXX*/ tvc->f.states |= CStatd;
2249 tvc->f.states &= ~CBulkFetching;
2250 afs_QueueCallback(tvc, CBHash(3600), tvolp);
2253 afs_StaleVCacheFlags(tvc, AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB,
2256 ReleaseWriteLock(&afs_xcbhash);
2257 afs_ProcessFS(tvc, &OutStatus, areq);
2259 ReleaseWriteLock(&tvc->lock);
2265 * Update callback status and (sometimes) attributes of a vnode.
2266 * Called after doing a fetch status RPC. Whilst disconnected, attributes
2267 * shouldn't be written to the vcache here.
2272 * \param Outsp Server status after rpc call.
2273 * \param acb Callback for this vnode.
2275 * \note The vcache must be write locked.
2278 afs_UpdateStatus(struct vcache *avc, struct VenusFid *afid,
2279 struct vrequest *areq, struct AFSFetchStatus *Outsp,
2280 struct AFSCallBack *acb, afs_uint32 start)
2282 struct volume *volp;
2285 /* Dont write status in vcache if resyncing after a disconnection. */
2286 afs_ProcessFS(avc, Outsp, areq);
2288 volp = afs_GetVolume(afid, areq, READ_LOCK);
2289 ObtainWriteLock(&afs_xcbhash, 469);
2290 avc->f.states |= CTruth;
2291 if (avc->callback /* check for race */ ) {
2292 if (acb->ExpirationTime != 0) {
2293 avc->cbExpires = acb->ExpirationTime + start;
2294 avc->f.states |= CStatd;
2295 avc->f.states &= ~CBulkFetching;
2296 afs_QueueCallback(avc, CBHash(acb->ExpirationTime), volp);
2297 } else if (avc->f.states & CRO) {
2298 /* ordinary callback on a read-only volume -- AFS 3.2 style */
2299 avc->cbExpires = 3600 + start;
2300 avc->f.states |= CStatd;
2301 avc->f.states &= ~CBulkFetching;
2302 afs_QueueCallback(avc, CBHash(3600), volp);
2304 afs_StaleVCacheFlags(avc,
2305 AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB,
2309 afs_StaleVCacheFlags(avc, AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB,
2312 ReleaseWriteLock(&afs_xcbhash);
2314 afs_PutVolume(volp, READ_LOCK);
2318 afs_BadFetchStatus(struct afs_conn *tc)
2320 int addr = ntohl(tc->parent->srvr->sa_ip);
2321 afs_warn("afs: Invalid AFSFetchStatus from server %u.%u.%u.%u\n",
2322 (addr >> 24) & 0xff, (addr >> 16) & 0xff, (addr >> 8) & 0xff,
2324 afs_warn("afs: This suggests the server may be sending bad data that "
2325 "can lead to availability issues or data corruption. The "
2326 "issue has been avoided for now, but it may not always be "
2327 "detectable. Please upgrade the server if possible.\n");
2331 * Check if a given AFSFetchStatus structure is sane.
2333 * @param[in] tc The server from which we received the status
2334 * @param[in] status The status we received
2336 * @return whether the given structure is valid or not
2337 * @retval 0 the structure is fine
2338 * @retval nonzero the structure looks like garbage; act as if we received
2339 * the returned error code from the server
2342 afs_CheckFetchStatus(struct afs_conn *tc, struct AFSFetchStatus *status)
2344 if (status->errorCode ||
2345 status->InterfaceVersion != 1 ||
2346 !(status->FileType > Invalid && status->FileType <= SymbolicLink) ||
2347 status->ParentVnode == 0 || status->ParentUnique == 0) {
2349 afs_warn("afs: FetchStatus ec %u iv %u ft %u pv %u pu %u\n",
2350 (unsigned)status->errorCode, (unsigned)status->InterfaceVersion,
2351 (unsigned)status->FileType, (unsigned)status->ParentVnode,
2352 (unsigned)status->ParentUnique);
2353 afs_BadFetchStatus(tc);
2361 * Must be called with avc write-locked
2362 * don't absolutely have to invalidate the hint unless the dv has
2363 * changed, but be sure to get it right else there will be consistency bugs.
2366 afs_FetchStatus(struct vcache * avc, struct VenusFid * afid,
2367 struct vrequest * areq, struct AFSFetchStatus * Outsp)
2370 afs_uint32 start = 0;
2371 struct afs_conn *tc;
2372 struct AFSCallBack CallBack;
2373 struct AFSVolSync tsync;
2374 struct rx_connection *rxconn;
2377 tc = afs_Conn(afid, areq, SHARED_LOCK, &rxconn);
2378 avc->dchint = NULL; /* invalidate hints */
2380 avc->callback = tc->parent->srvr->server;
2382 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_FETCHSTATUS);
2385 RXAFS_FetchStatus(rxconn, (struct AFSFid *)&afid->Fid, Outsp,
2392 code = afs_CheckFetchStatus(tc, Outsp);
2397 } while (afs_Analyze
2398 (tc, rxconn, code, afid, areq, AFS_STATS_FS_RPCIDX_FETCHSTATUS,
2399 SHARED_LOCK, NULL));
2402 afs_UpdateStatus(avc, afid, areq, Outsp, &CallBack, start);
2404 /* used to undo the local callback, but that's too extreme.
2405 * There are plenty of good reasons that fetchstatus might return
2406 * an error, such as EPERM. If we have the vnode cached, statd,
2407 * with callback, might as well keep track of the fact that we
2408 * don't have access...
2410 if (code == EPERM || code == EACCES) {
2411 struct axscache *ac;
2412 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
2414 else /* not found, add a new one if possible */
2415 afs_AddAxs(avc->Access, areq->uid, 0);
2422 * Decrements the reference count on a cache entry.
2424 * \param avc Pointer to the cache entry to decrement.
2426 * \note Environment: Nothing interesting.
2429 afs_PutVCache(struct vcache *avc)
2431 AFS_STATCNT(afs_PutVCache);
2432 #ifdef AFS_DARWIN80_ENV
2433 vnode_put(AFSTOV(avc));
2437 * Can we use a read lock here?
2439 ObtainReadLock(&afs_xvcache);
2441 ReleaseReadLock(&afs_xvcache);
2443 } /*afs_PutVCache */
2447 * Reset a vcache entry, so local contents are ignored, and the
2448 * server will be reconsulted next time the vcache is used
2450 * \param avc Pointer to the cache entry to reset
2452 * \param skipdnlc skip the dnlc purge for this vnode
2454 * \note avc must be write locked on entry
2456 * \note The caller should purge the dnlc when skipdnlc is set.
2459 afs_ResetVCache(struct vcache *avc, afs_ucred_t *acred, afs_int32 skipdnlc)
2461 afs_stalevc_flags_t flags = 0;
2463 flags |= AFS_STALEVC_NODNLC;
2466 afs_StaleVCacheFlags(avc, flags, CDirty); /* next reference will re-stat */
2467 /* now find the disk cache entries */
2468 afs_TryToSmush(avc, acred, 1);
2469 if (avc->linkData && !(avc->f.states & CCore)) {
2470 afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1);
2471 avc->linkData = NULL;
2476 * Sleepa when searching for a vcache. Releases all the pending locks,
2477 * sleeps then obtains the previously released locks.
2479 * \param vcache Enter sleep state.
2480 * \param flag Determines what locks to use.
2485 findvc_sleep(struct vcache *avc, int flag)
2487 if (flag & IS_SLOCK) {
2488 ReleaseSharedLock(&afs_xvcache);
2490 if (flag & IS_WLOCK) {
2491 ReleaseWriteLock(&afs_xvcache);
2493 ReleaseReadLock(&afs_xvcache);
2496 afs_osi_Sleep(&avc->f.states);
2497 if (flag & IS_SLOCK) {
2498 ObtainSharedLock(&afs_xvcache, 341);
2500 if (flag & IS_WLOCK) {
2501 ObtainWriteLock(&afs_xvcache, 343);
2503 ObtainReadLock(&afs_xvcache);
2509 * Add a reference on an existing vcache entry.
2511 * \param tvc Pointer to the vcache.
2513 * \note Environment: Must be called with at least one reference from
2514 * elsewhere on the vcache, even if that reference will be dropped.
2515 * The global lock is required.
2517 * \return 0 on success, -1 on failure.
2521 afs_RefVCache(struct vcache *tvc)
2523 #ifdef AFS_DARWIN80_ENV
2527 /* AFS_STATCNT(afs_RefVCache); */
2529 #ifdef AFS_DARWIN80_ENV
2533 if (vnode_ref(tvp)) {
2535 /* AFSTOV(tvc) may be NULL */
2544 } /*afs_RefVCache */
2547 * Find a vcache entry given a fid.
2549 * \param afid Pointer to the fid whose cache entry we desire.
2550 * \param retry (SGI-specific) tell the caller to drop the lock on xvcache,
2551 * unlock the vnode, and try again.
2552 * \param flag Bit 1 to specify whether to compute hit statistics. Not
2553 * set if FindVCache is called as part of internal bookkeeping.
2555 * \note Environment: Must be called with the afs_xvcache lock at least held at
2556 * the read level. In order to do the VLRU adjustment, the xvcache lock
2557 * must be shared-- we upgrade it here.
2561 afs_FindVCache(struct VenusFid *afid, afs_int32 * retry, afs_int32 flag)
2566 #ifdef AFS_DARWIN80_ENV
2567 struct vcache *deadvc = NULL, *livevc = NULL;
2571 AFS_STATCNT(afs_FindVCache);
2575 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2576 if (FidMatches(afid, tvc)) {
2577 if (tvc->f.states & CVInit) {
2578 findvc_sleep(tvc, flag);
2581 #ifdef AFS_DARWIN80_ENV
2582 if (tvc->f.states & CDeadVnode) {
2583 findvc_sleep(tvc, flag);
2591 /* should I have a read lock on the vnode here? */
2595 #if defined(AFS_DARWIN80_ENV)
2599 if (tvp && vnode_ref(tvp)) {
2601 /* AFSTOV(tvc) may be NULL */
2610 #elif defined(AFS_DARWIN_ENV)
2611 tvc->f.states |= CUBCinit;
2613 if (UBCINFOMISSING(AFSTOV(tvc)) ||
2614 UBCINFORECLAIMED(AFSTOV(tvc))) {
2615 ubc_info_init(AFSTOV(tvc));
2618 tvc->f.states &= ~CUBCinit;
2620 osi_vnhold(tvc, retry); /* already held, above */
2621 if (retry && *retry)
2625 * only move to front of vlru if we have proper vcache locking)
2627 if (flag & DO_VLRU) {
2628 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2629 refpanic("FindVC VLRU inconsistent1");
2631 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2632 refpanic("FindVC VLRU inconsistent1");
2634 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2635 refpanic("FindVC VLRU inconsistent2");
2637 UpgradeSToWLock(&afs_xvcache, 26);
2638 QRemove(&tvc->vlruq);
2639 QAdd(&VLRU, &tvc->vlruq);
2640 ConvertWToSLock(&afs_xvcache);
2641 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2642 refpanic("FindVC VLRU inconsistent1");
2644 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2645 refpanic("FindVC VLRU inconsistent2");
2647 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2648 refpanic("FindVC VLRU inconsistent3");
2654 if (flag & DO_STATS) {
2656 afs_stats_cmperf.vcacheHits++;
2658 afs_stats_cmperf.vcacheMisses++;
2659 if (afs_IsPrimaryCellNum(afid->Cell))
2660 afs_stats_cmperf.vlocalAccesses++;
2662 afs_stats_cmperf.vremoteAccesses++;
2665 } /*afs_FindVCache */
2668 * Find a vcache entry given a fid. Does a wildcard match on what we
2669 * have for the fid. If more than one entry, don't return anything.
2671 * \param avcp Fill in pointer if we found one and only one.
2672 * \param afid Pointer to the fid whose cache entry we desire.
2673 * \param retry (SGI-specific) tell the caller to drop the lock on xvcache,
2674 * unlock the vnode, and try again.
2675 * \param flags bit 1 to specify whether to compute hit statistics. Not
2676 * set if FindVCache is called as part of internal bookkeeping.
2678 * \note Environment: Must be called with the afs_xvcache lock at least held at
2679 * the read level. In order to do the VLRU adjustment, the xvcache lock
2680 * must be shared-- we upgrade it here.
2682 * \return Number of matches found.
2685 int afs_duplicate_nfs_fids = 0;
2688 afs_NFSFindVCache(struct vcache **avcp, struct VenusFid *afid)
2692 afs_int32 count = 0;
2693 struct vcache *found_tvc = NULL;
2694 #ifdef AFS_DARWIN80_ENV
2698 AFS_STATCNT(afs_FindVCache);
2702 ObtainSharedLock(&afs_xvcache, 331);
2705 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2706 /* Match only on what we have.... */
2707 if (((tvc->f.fid.Fid.Vnode & 0xffff) == afid->Fid.Vnode)
2708 && (tvc->f.fid.Fid.Volume == afid->Fid.Volume)
2709 && ((tvc->f.fid.Fid.Unique & 0xffffff) == afid->Fid.Unique)
2710 && (tvc->f.fid.Cell == afid->Cell)) {
2711 if (tvc->f.states & CVInit) {
2712 ReleaseSharedLock(&afs_xvcache);
2713 afs_osi_Sleep(&tvc->f.states);
2716 #ifdef AFS_DARWIN80_ENV
2717 if (tvc->f.states & CDeadVnode) {
2718 ReleaseSharedLock(&afs_xvcache);
2719 afs_osi_Sleep(&tvc->f.states);
2723 if (vnode_get(tvp)) {
2724 /* This vnode no longer exists. */
2727 if (vnode_ref(tvp)) {
2728 /* This vnode no longer exists. */
2730 /* AFSTOV(tvc) may be NULL */
2735 #endif /* AFS_DARWIN80_ENV */
2739 afs_duplicate_nfs_fids++;
2740 ReleaseSharedLock(&afs_xvcache);
2741 #ifdef AFS_DARWIN80_ENV
2742 /* Drop our reference counts. */
2743 vnode_put(AFSTOV(tvc));
2744 vnode_put(AFSTOV(found_tvc));
2753 /* should I have a read lock on the vnode here? */
2755 #ifndef AFS_DARWIN80_ENV
2756 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
2757 afs_int32 retry = 0;
2758 osi_vnhold(tvc, &retry);
2761 found_tvc = (struct vcache *)0;
2762 ReleaseSharedLock(&afs_xvcache);
2763 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
2767 osi_vnhold(tvc, (int *)0); /* already held, above */
2771 * We obtained the xvcache lock above.
2773 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2774 refpanic("FindVC VLRU inconsistent1");
2776 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2777 refpanic("FindVC VLRU inconsistent1");
2779 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2780 refpanic("FindVC VLRU inconsistent2");
2782 UpgradeSToWLock(&afs_xvcache, 568);
2783 QRemove(&tvc->vlruq);
2784 QAdd(&VLRU, &tvc->vlruq);
2785 ConvertWToSLock(&afs_xvcache);
2786 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2787 refpanic("FindVC VLRU inconsistent1");
2789 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2790 refpanic("FindVC VLRU inconsistent2");
2792 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2793 refpanic("FindVC VLRU inconsistent3");
2799 afs_stats_cmperf.vcacheHits++;
2801 afs_stats_cmperf.vcacheMisses++;
2802 if (afs_IsPrimaryCellNum(afid->Cell))
2803 afs_stats_cmperf.vlocalAccesses++;
2805 afs_stats_cmperf.vremoteAccesses++;
2807 *avcp = tvc; /* May be null */
2809 ReleaseSharedLock(&afs_xvcache);
2810 return (tvc ? 1 : 0);
2812 } /*afs_NFSFindVCache */
2818 * Initialize vcache related variables
2823 afs_vcacheInit(int astatSize)
2825 #if !defined(AFS_LINUX22_ENV)
2829 if (!afs_maxvcount) {
2830 afs_maxvcount = astatSize; /* no particular limit on linux? */
2832 #if !defined(AFS_LINUX22_ENV)
2836 AFS_RWLOCK_INIT(&afs_xvcache, "afs_xvcache");
2837 LOCK_INIT(&afs_xvcb, "afs_xvcb");
2839 #if !defined(AFS_LINUX22_ENV)
2840 /* Allocate and thread the struct vcache entries */
2841 tvp = afs_osi_Alloc(astatSize * sizeof(struct vcache));
2842 osi_Assert(tvp != NULL);
2843 memset(tvp, 0, sizeof(struct vcache) * astatSize);
2845 Initial_freeVCList = tvp;
2846 freeVCList = &(tvp[0]);
2847 for (i = 0; i < astatSize - 1; i++) {
2848 tvp[i].nextfree = &(tvp[i + 1]);
2850 tvp[astatSize - 1].nextfree = NULL;
2851 # ifdef KERNEL_HAVE_PIN
2852 pin((char *)tvp, astatSize * sizeof(struct vcache)); /* XXX */
2856 #if defined(AFS_SGI_ENV)
2857 for (i = 0; i < astatSize; i++) {
2858 char name[METER_NAMSZ];
2859 struct vcache *tvc = &tvp[i];
2861 tvc->v.v_number = ++afsvnumbers;
2862 tvc->vc_rwlockid = OSI_NO_LOCKID;
2863 initnsema(&tvc->vc_rwlock, 1,
2864 makesname(name, "vrw", tvc->v.v_number));
2865 #ifndef AFS_SGI53_ENV
2866 initnsema(&tvc->v.v_sync, 0, makesname(name, "vsy", tvc->v.v_number));
2868 #ifndef AFS_SGI62_ENV
2869 initnlock(&tvc->v.v_lock, makesname(name, "vlk", tvc->v.v_number));
2870 #endif /* AFS_SGI62_ENV */
2874 for(i = 0; i < VCSIZE; ++i)
2875 QInit(&afs_vhashTV[i]);
2882 shutdown_vcache(void)
2885 struct afs_cbr *tsp;
2887 * XXX We may potentially miss some of the vcaches because if when
2888 * there are no free vcache entries and all the vcache entries are active
2889 * ones then we allocate an additional one - admittedly we almost never
2894 struct afs_q *tq, *uq = NULL;
2896 for (tq = VLRU.prev; tq != &VLRU; tq = uq) {
2899 if (tvc->mvid.target_root) {
2900 osi_FreeSmallSpace(tvc->mvid.target_root);
2901 tvc->mvid.target_root = NULL;
2904 aix_gnode_rele(AFSTOV(tvc));
2906 if (tvc->linkData) {
2907 afs_osi_Free(tvc->linkData, strlen(tvc->linkData) + 1);
2912 * Also free the remaining ones in the Cache
2914 for (i = 0; i < VCSIZE; i++) {
2915 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2916 if (tvc->mvid.target_root) {
2917 osi_FreeSmallSpace(tvc->mvid.target_root);
2918 tvc->mvid.target_root = NULL;
2922 afs_osi_Free(tvc->v.v_gnode, sizeof(struct gnode));
2923 #ifdef AFS_AIX32_ENV
2926 vms_delete(tvc->segid);
2928 tvc->segid = tvc->vmh = NULL;
2929 if (VREFCOUNT_GT(tvc,0))
2930 osi_Panic("flushVcache: vm race");
2938 #if defined(AFS_SUN5_ENV)
2944 if (tvc->linkData) {
2945 afs_osi_Free(tvc->linkData, strlen(tvc->linkData) + 1);
2950 afs_FreeAllAxs(&(tvc->Access));
2956 * Free any leftover callback queue
2958 for (i = 0; i < afs_stats_cmperf.CallBackAlloced; i++) {
2959 tsp = afs_cbrHeads[i];
2960 afs_cbrHeads[i] = 0;
2961 afs_osi_Free((char *)tsp, AFS_NCBRS * sizeof(struct afs_cbr));
2965 #if !defined(AFS_LINUX22_ENV)
2966 afs_osi_Free(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache));
2968 # ifdef KERNEL_HAVE_PIN
2969 unpin(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache));
2972 freeVCList = Initial_freeVCList = 0;
2975 AFS_RWLOCK_INIT(&afs_xvcache, "afs_xvcache");
2976 LOCK_INIT(&afs_xvcb, "afs_xvcb");
2978 for(i = 0; i < VCSIZE; ++i)
2979 QInit(&afs_vhashTV[i]);
2983 afs_DisconGiveUpCallbacks(void)
2989 ObtainWriteLock(&afs_xvcache, 1002); /* XXX - should be a unique number */
2992 /* Somehow, walk the set of vcaches, with each one coming out as tvc */
2993 for (i = 0; i < VCSIZE; i++) {
2994 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2996 if (afs_QueueVCB(tvc, &slept)) {
2997 tvc->callback = NULL;
3006 ReleaseWriteLock(&afs_xvcache);
3013 * Clear the Statd flag from all vcaches
3015 * This function removes the Statd flag from all vcaches. It's used by
3016 * disconnected mode to tidy up during reconnection
3020 afs_ClearAllStatdFlag(void)
3025 ObtainWriteLock(&afs_xvcache, 715);
3027 for (i = 0; i < VCSIZE; i++) {
3028 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
3029 afs_StaleVCacheFlags(tvc, AFS_STALEVC_NODNLC | AFS_STALEVC_NOCB,
3033 ReleaseWriteLock(&afs_xvcache);
3037 * Mark a vcache as stale; our metadata for the relevant file may be out of
3040 * @post Any subsequent access to this vcache will cause us to fetch the
3041 * metadata for this vcache again.
3044 afs_StaleVCacheFlags(struct vcache *avc, afs_stalevc_flags_t flags,
3048 int do_filename = 0;
3050 int lock_cbhash = 1;
3052 if ((flags & AFS_STALEVC_NODNLC)) {
3055 if ((flags & AFS_STALEVC_FILENAME)) {
3058 if ((flags & AFS_STALEVC_CBLOCKED)) {
3061 if ((flags & AFS_STALEVC_NOCB)) {
3067 ObtainWriteLock(&afs_xcbhash, 486);
3070 afs_DequeueCallback(avc);
3074 avc->f.states &= ~cflags;
3077 ReleaseWriteLock(&afs_xcbhash);
3080 if ((flags & AFS_STALEVC_SKIP_DNLC_FOR_INIT_FLUSHED) &&
3081 (avc->f.states & (CVInit | CVFlushed))) {
3085 if (flags & AFS_STALEVC_CLEARCB) {
3086 avc->callback = NULL;
3090 if ((avc->f.fid.Fid.Vnode & 1) ||
3091 AFSTOV(avc) == NULL || vType(avc) == VDIR ||
3092 (avc->f.states & CForeign)) {
3093 /* This vcache is (or could be) a directory. */
3094 osi_dnlc_purgedp(avc);
3096 } else if (do_filename) {
3097 osi_dnlc_purgevp(avc);
3103 afs_SetDataVersion(struct vcache *avc, afs_hyper_t *avers)
3105 hset(avc->f.m.DataVersion, *avers);