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
11 * --------------------- Required definitions ---------------------
13 #include <afsconfig.h>
14 #include "afs/param.h"
17 #include "afs/sysincludes.h" /*Standard vendor system headers */
18 #include "afsincludes.h" /*AFS-based standard headers */
19 #include "afs/afs_stats.h" /* statistics */
20 #include "afs/afs_cbqueue.h"
21 #include "afs/afs_osidnlc.h"
23 afs_uint32 afs_stampValue = 0;
29 * Send a truncation request to a FileServer.
35 * We're write-locked upon entry.
39 afs_StoreMini(register struct vcache *avc, struct vrequest *areq)
41 register struct afs_conn *tc;
42 struct AFSStoreStatus InStatus;
43 struct AFSFetchStatus OutStatus;
44 struct AFSVolSync tsync;
45 register afs_int32 code, code2;
46 register struct rx_call *tcall;
47 afs_size_t tlen, xlen = 0;
49 AFS_STATCNT(afs_StoreMini);
50 afs_Trace2(afs_iclSetp, CM_TRACE_STOREMINI, ICL_TYPE_POINTER, avc,
51 ICL_TYPE_INT32, avc->f.m.Length);
52 tlen = avc->f.m.Length;
53 if (avc->f.truncPos < tlen)
54 tlen = avc->f.truncPos;
55 avc->f.truncPos = AFS_NOTRUNC;
56 avc->f.states &= ~CExtendedFile;
59 tc = afs_Conn(&avc->f.fid, areq, SHARED_LOCK);
61 #ifdef AFS_64BIT_CLIENT
65 tcall = rx_NewCall(tc->id);
67 /* Set the client mod time since we always want the file
68 * to have the client's mod time and not the server's one
69 * (to avoid problems with make, etc.) It almost always
70 * works fine with standard afs because them server/client
71 * times are in sync and more importantly this storemini
72 * it's a special call that would typically be followed by
73 * the proper store-data or store-status calls.
75 InStatus.Mask = AFS_SETMODTIME;
76 InStatus.ClientModTime = avc->f.m.Date;
77 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_STOREDATA);
78 afs_Trace4(afs_iclSetp, CM_TRACE_STOREDATA64, ICL_TYPE_FID,
79 &avc->f.fid.Fid, ICL_TYPE_OFFSET,
80 ICL_HANDLE_OFFSET(avc->f.m.Length), ICL_TYPE_OFFSET,
81 ICL_HANDLE_OFFSET(xlen), ICL_TYPE_OFFSET,
82 ICL_HANDLE_OFFSET(tlen));
84 #ifdef AFS_64BIT_CLIENT
85 if (!afs_serverHasNo64Bit(tc)) {
87 StartRXAFS_StoreData64(tcall,
88 (struct AFSFid *)&avc->f.fid.Fid,
89 &InStatus, avc->f.m.Length,
90 (afs_size_t) 0, tlen);
95 if ((avc->f.m.Length > 0x7fffffff) ||
96 (tlen > 0x7fffffff) ||
97 ((0x7fffffff - tlen) < avc->f.m.Length))
100 StartRXAFS_StoreData(tcall,
101 (struct AFSFid *)&avc->f.fid.Fid,
102 &InStatus, l1, 0, l2);
104 #else /* AFS_64BIT_CLIENT */
106 StartRXAFS_StoreData(tcall, (struct AFSFid *)&avc->f.fid.Fid,
107 &InStatus, avc->f.m.Length, 0, tlen);
108 #endif /* AFS_64BIT_CLIENT */
110 code = EndRXAFS_StoreData(tcall, &OutStatus, &tsync);
112 code2 = rx_EndCall(tcall, code);
117 #ifdef AFS_64BIT_CLIENT
118 if (code == RXGEN_OPCODE && !afs_serverHasNo64Bit(tc)) {
119 afs_serverSetNo64Bit(tc);
122 #endif /* AFS_64BIT_CLIENT */
126 (tc, code, &avc->f.fid, areq, AFS_STATS_FS_RPCIDX_STOREDATA,
130 afs_ProcessFS(avc, &OutStatus, areq);
136 * afs_StoreAllSegments
139 * Stores all modified segments back to server
142 * avc : Pointer to vcache entry.
143 * areq : Pointer to request structure.
146 * Called with avc write-locked.
148 #if defined (AFS_HPUX_ENV)
149 int NCHUNKSATONCE = 3;
151 int NCHUNKSATONCE = 64;
157 afs_StoreAllSegments(register struct vcache *avc, struct vrequest *areq,
160 register struct dcache *tdc;
161 register afs_int32 code = 0;
162 register afs_int32 index;
163 register afs_int32 origCBs, foreign = 0;
165 afs_hyper_t newDV, oldDV; /* DV when we start, and finish, respectively */
166 struct dcache **dcList;
167 unsigned int i, j, minj, moredata, high, off;
169 afs_size_t maxStoredLength; /* highest offset we've written to server. */
170 int safety, marineronce = 0;
172 AFS_STATCNT(afs_StoreAllSegments);
174 hset(oldDV, avc->f.m.DataVersion);
175 hset(newDV, avc->f.m.DataVersion);
176 hash = DVHash(&avc->f.fid);
177 foreign = (avc->f.states & CForeign);
178 dcList = (struct dcache **)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
179 afs_Trace2(afs_iclSetp, CM_TRACE_STOREALL, ICL_TYPE_POINTER, avc,
180 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
181 #if !defined(AFS_AIX32_ENV) && !defined(AFS_SGI65_ENV)
182 /* In the aix vm implementation we need to do the vm_writep even
183 * on the memcache case since that's we adjust the file's size
184 * and finish flushing partial vm pages.
186 if ((cacheDiskType != AFS_FCACHE_TYPE_MEM) || (sync & AFS_LASTSTORE))
187 #endif /* !AFS_AIX32_ENV && !AFS_SGI65_ENV */
189 /* If we're not diskless, reading a file may stress the VM
190 * system enough to cause a pageout, and this vnode would be
191 * locked when the pageout occurs. We can prevent this problem
192 * by making sure all dirty pages are already flushed. We don't
193 * do this when diskless because reading a diskless (i.e.
194 * memory-resident) chunk doesn't require using new VM, and we
195 * also don't want to dump more dirty data into a diskless cache,
196 * since they're smaller, and we might exceed its available
199 #if defined(AFS_SUN5_ENV)
200 if (sync & AFS_VMSYNC_INVAL) /* invalidate VM pages */
201 osi_VM_TryToSmush(avc, CRED(), 1);
204 osi_VM_StoreAllSegments(avc);
206 if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
207 /* This will probably make someone sad ... */
208 /*printf("Net down in afs_StoreSegments\n");*/
211 ConvertWToSLock(&avc->lock);
214 * Subsequent code expects a sorted list, and it expects all the
215 * chunks in the list to be contiguous, so we need a sort and a
216 * while loop in here, too - but this will work for a first pass...
217 * 92.10.05 - OK, there's a sort in here now. It's kind of a modified
218 * bin sort, I guess. Chunk numbers start with 0
220 * - Have to get a write lock on xdcache because GetDSlot might need it (if
221 * the chunk doesn't have a dcache struct).
222 * This seems like overkill in most cases.
223 * - I'm not sure that it's safe to do "index = .hvNextp", then unlock
224 * xdcache, then relock xdcache and try to use index. It is done
225 * a lot elsewhere in the CM, but I'm not buying that argument.
226 * - should be able to check IFDataMod without doing the GetDSlot (just
227 * hold afs_xdcache). That way, it's easy to do this without the
228 * writelock on afs_xdcache, and we save unneccessary disk
229 * operations. I don't think that works, 'cuz the next pointers
232 origCBs = afs_allCBs;
235 tlen = avc->f.m.Length;
239 memset(dcList, 0, NCHUNKSATONCE * sizeof(struct dcache *));
243 /* lock and start over from beginning of hash chain
244 * in order to avoid a race condition. */
245 ObtainWriteLock(&afs_xdcache, 284);
246 index = afs_dvhashTbl[hash];
248 for (j = 0; index != NULLIDX;) {
249 if ((afs_indexFlags[index] & IFDataMod)
250 && (afs_indexUnique[index] == avc->f.fid.Fid.Unique)) {
251 tdc = afs_GetDSlot(index, 0); /* refcount+1. */
252 ReleaseReadLock(&tdc->tlock);
253 if (!FidCmp(&tdc->f.fid, &avc->f.fid) && tdc->f.chunk >= minj) {
254 off = tdc->f.chunk - minj;
255 if (off < NCHUNKSATONCE) {
257 osi_Panic("dclist slot already in use!");
258 if (afs_mariner && !marineronce) {
259 /* first chunk only */
260 afs_MarinerLog("store$Storing", avc);
267 /* DCLOCKXXX: chunkBytes is protected by tdc->lock which we
268 * can't grab here, due to lock ordering with afs_xdcache.
269 * So, disable this shortcut for now. -- kolya 2001-10-13
271 /* shortcut: big win for little files */
272 /* tlen -= tdc->f.chunkBytes;
279 if (j == NCHUNKSATONCE)
286 index = afs_dvnextTbl[index];
288 ReleaseWriteLock(&afs_xdcache);
290 /* this guy writes chunks, puts back dcache structs, and bumps newDV */
291 /* "moredata" just says "there are more dirty chunks yet to come".
295 afs_CacheStoreVCache(dcList, avc, areq, sync,
296 minj, high, moredata,
297 &newDV, &maxStoredLength);
298 /* Release any zero-length dcache entries in our interval
299 * that we locked but didn't store back above.
301 for (j = 0; j <= high; j++) {
304 osi_Assert(tdc->f.chunkBytes == 0);
305 ReleaseSharedLock(&tdc->lock);
311 minj += NCHUNKSATONCE;
312 } while (!code && moredata);
314 UpgradeSToWLock(&avc->lock, 29);
316 /* send a trivial truncation store if did nothing else */
319 * Call StoreMini if we haven't written enough data to extend the
320 * file at the fileserver to the client's notion of the file length.
322 if ((avc->f.truncPos != AFS_NOTRUNC)
323 || ((avc->f.states & CExtendedFile)
324 && (maxStoredLength < avc->f.m.Length))) {
325 code = afs_StoreMini(avc, areq);
327 hadd32(newDV, 1); /* just bumped here, too */
329 avc->f.states &= ~CExtendedFile;
333 * Finally, turn off DWriting, turn on DFEntryMod,
334 * update f.versionNo.
335 * A lot of this could be integrated into the loop above
346 NCHUNKSATONCE * sizeof(struct dcache *));
348 /* overkill, but it gets the lock in case GetDSlot needs it */
349 ObtainWriteLock(&afs_xdcache, 285);
351 for (j = 0, safety = 0, index = afs_dvhashTbl[hash];
352 index != NULLIDX && safety < afs_cacheFiles + 2;) {
354 if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
355 tdc = afs_GetDSlot(index, 0);
356 ReleaseReadLock(&tdc->tlock);
358 if (!FidCmp(&tdc->f.fid, &avc->f.fid)
359 && tdc->f.chunk >= minj) {
360 off = tdc->f.chunk - minj;
361 if (off < NCHUNKSATONCE) {
362 /* this is the file, and the correct chunk range */
363 if (j >= NCHUNKSATONCE)
365 ("Too many dcache entries in range\n");
370 if (j == NCHUNKSATONCE)
378 index = afs_dvnextTbl[index];
380 ReleaseWriteLock(&afs_xdcache);
382 for (i = 0; i < j; i++) {
383 /* Iterate over the dcache entries we collected above */
385 ObtainSharedLock(&tdc->lock, 677);
387 /* was code here to clear IFDataMod, but it should only be done
388 * in storedcache and storealldcache.
390 /* Only increase DV if we had up-to-date data to start with.
391 * Otherwise, we could be falsely upgrading an old chunk
392 * (that we never read) into one labelled with the current
393 * DV #. Also note that we check that no intervening stores
394 * occurred, otherwise we might mislabel cache information
395 * for a chunk that we didn't store this time
397 /* Don't update the version number if it's not yet set. */
398 if (!hsame(tdc->f.versionNo, h_unset)
399 && hcmp(tdc->f.versionNo, oldDV) >= 0) {
401 if ((!(afs_dvhack || foreign)
402 && hsame(avc->f.m.DataVersion, newDV))
403 || ((afs_dvhack || foreign)
404 && (origCBs == afs_allCBs))) {
405 /* no error, this is the DV */
407 UpgradeSToWLock(&tdc->lock, 678);
408 hset(tdc->f.versionNo, avc->f.m.DataVersion);
409 tdc->dflags |= DFEntryMod;
410 ConvertWToSLock(&tdc->lock);
414 ReleaseSharedLock(&tdc->lock);
418 minj += NCHUNKSATONCE;
425 * Invalidate chunks after an error for ccores files since
426 * afs_inactive won't be called for these and they won't be
427 * invalidated. Also discard data if it's a permanent error from the
430 if (areq->permWriteError || (avc->f.states & CCore)) {
431 afs_InvalidateAllSegments(avc);
434 afs_Trace3(afs_iclSetp, CM_TRACE_STOREALLDONE, ICL_TYPE_POINTER, avc,
435 ICL_TYPE_INT32, avc->f.m.Length, ICL_TYPE_INT32, code);
436 /* would like a Trace5, but it doesn't exist... */
437 afs_Trace3(afs_iclSetp, CM_TRACE_AVCLOCKER, ICL_TYPE_POINTER, avc,
438 ICL_TYPE_INT32, avc->lock.wait_states, ICL_TYPE_INT32,
439 avc->lock.excl_locked);
440 afs_Trace4(afs_iclSetp, CM_TRACE_AVCLOCKEE, ICL_TYPE_POINTER, avc,
441 ICL_TYPE_INT32, avc->lock.wait_states, ICL_TYPE_INT32,
442 avc->lock.readers_reading, ICL_TYPE_INT32,
443 avc->lock.num_waiting);
446 * Finally, if updated DataVersion matches newDV, we did all of the
447 * stores. If mapDV indicates that the page cache was flushed up
448 * to when we started the store, then we can relabel them as flushed
449 * as recently as newDV.
450 * Turn off CDirty bit because the stored data is now in sync with server.
452 if (code == 0 && hcmp(avc->mapDV, oldDV) >= 0) {
453 if ((!(afs_dvhack || foreign) && hsame(avc->f.m.DataVersion, newDV))
454 || ((afs_dvhack || foreign) && (origCBs == afs_allCBs))) {
455 hset(avc->mapDV, newDV);
456 avc->f.states &= ~CDirty;
459 osi_FreeLargeSpace(dcList);
461 /* If not the final write a temporary error is ok. */
462 if (code && !areq->permWriteError && !(sync & AFS_LASTSTORE))
467 } /*afs_StoreAllSegments (new 03/02/94) */
471 * afs_InvalidateAllSegments
474 * Invalidates all chunks for a given file
477 * avc : Pointer to vcache entry.
480 * For example, called after an error has been detected. Called
481 * with avc write-locked, and afs_xdcache unheld.
485 afs_InvalidateAllSegments(struct vcache *avc)
490 struct dcache **dcList;
491 int i, dcListMax, dcListCount;
493 AFS_STATCNT(afs_InvalidateAllSegments);
494 afs_Trace2(afs_iclSetp, CM_TRACE_INVALL, ICL_TYPE_POINTER, avc,
495 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
496 hash = DVHash(&avc->f.fid);
497 avc->f.truncPos = AFS_NOTRUNC; /* don't truncate later */
498 avc->f.states &= ~CExtendedFile; /* not any more */
499 ObtainWriteLock(&afs_xcbhash, 459);
500 afs_DequeueCallback(avc);
501 avc->f.states &= ~(CStatd | CDirty); /* mark status information as bad, too */
502 ReleaseWriteLock(&afs_xcbhash);
503 if (avc->f.fid.Fid.Vnode & 1 || (vType(avc) == VDIR))
504 osi_dnlc_purgedp(avc);
505 /* Blow away pages; for now, only for Solaris */
506 #if (defined(AFS_SUN5_ENV))
507 if (WriteLocked(&avc->lock))
508 osi_ReleaseVM(avc, (afs_ucred_t *)0);
511 * Block out others from screwing with this table; is a read lock
514 ObtainWriteLock(&afs_xdcache, 286);
517 for (index = afs_dvhashTbl[hash]; index != NULLIDX;) {
518 if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
519 tdc = afs_GetDSlot(index, 0);
520 ReleaseReadLock(&tdc->tlock);
521 if (!FidCmp(&tdc->f.fid, &avc->f.fid))
525 index = afs_dvnextTbl[index];
528 dcList = osi_Alloc(dcListMax * sizeof(struct dcache *));
531 for (index = afs_dvhashTbl[hash]; index != NULLIDX;) {
532 if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
533 tdc = afs_GetDSlot(index, 0);
534 ReleaseReadLock(&tdc->tlock);
535 if (!FidCmp(&tdc->f.fid, &avc->f.fid)) {
536 /* same file? we'll zap it */
537 if (afs_indexFlags[index] & IFDataMod) {
538 afs_stats_cmperf.cacheCurrDirtyChunks--;
539 /* don't write it back */
540 afs_indexFlags[index] &= ~IFDataMod;
542 afs_indexFlags[index] &= ~IFAnyPages;
543 if (dcListCount < dcListMax)
544 dcList[dcListCount++] = tdc;
551 index = afs_dvnextTbl[index];
553 ReleaseWriteLock(&afs_xdcache);
555 for (i = 0; i < dcListCount; i++) {
558 ObtainWriteLock(&tdc->lock, 679);
560 if (vType(avc) == VDIR)
562 ReleaseWriteLock(&tdc->lock);
566 osi_Free(dcList, dcListMax * sizeof(struct dcache *));
573 * Extend a cache file
575 * \param avc pointer to vcache to extend data for
576 * \param alen Length to extend file to
579 * \note avc must be write locked. May release and reobtain avc and GLOCK
582 afs_ExtendSegments(struct vcache *avc, afs_size_t alen, struct vrequest *areq) {
583 afs_size_t offset, toAdd;
584 struct osi_file *tfile;
589 zeros = (void *) afs_osi_Alloc(AFS_PAGESIZE);
592 memset(zeros, 0, AFS_PAGESIZE);
594 while (avc->f.m.Length < alen) {
595 tdc = afs_ObtainDCacheForWriting(avc, avc->f.m.Length, alen - avc->f.m.Length, areq, 0);
601 toAdd = alen - avc->f.m.Length;
603 offset = avc->f.m.Length - AFS_CHUNKTOBASE(tdc->f.chunk);
604 if (offset + toAdd > AFS_CHUNKTOSIZE(tdc->f.chunk)) {
605 toAdd = AFS_CHUNKTOSIZE(tdc->f.chunk) - offset;
607 tfile = afs_CFileOpen(&tdc->f.inode);
608 while(tdc->validPos < avc->f.m.Length + toAdd) {
611 towrite = (avc->f.m.Length + toAdd) - tdc->validPos;
612 if (towrite > AFS_PAGESIZE) towrite = AFS_PAGESIZE;
614 code = afs_CFileWrite(tfile,
615 tdc->validPos - AFS_CHUNKTOBASE(tdc->f.chunk),
617 tdc->validPos += towrite;
619 afs_CFileClose(tfile);
620 afs_AdjustSize(tdc, offset + toAdd );
621 avc->f.m.Length += toAdd;
622 ReleaseWriteLock(&tdc->lock);
626 afs_osi_Free(zeros, AFS_PAGESIZE);
631 * afs_TruncateAllSegments
634 * Truncate a cache file.
637 * avc : Ptr to vcache entry to truncate.
638 * alen : Number of bytes to make the file.
639 * areq : Ptr to request structure.
642 * Called with avc write-locked; in VFS40 systems, pvnLock is also
646 afs_TruncateAllSegments(register struct vcache *avc, afs_size_t alen,
647 struct vrequest *areq, afs_ucred_t *acred)
649 register struct dcache *tdc;
650 register afs_int32 code;
651 register afs_int32 index;
655 struct dcache **tdcArray;
657 AFS_STATCNT(afs_TruncateAllSegments);
658 avc->f.m.Date = osi_Time();
659 afs_Trace3(afs_iclSetp, CM_TRACE_TRUNCALL, ICL_TYPE_POINTER, avc,
660 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length),
661 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(alen));
662 if (alen >= avc->f.m.Length) {
664 * Special speedup since Sun's vm extends the file this way;
665 * we've never written to the file thus we can just set the new
666 * length and avoid the needless calls below.
667 * Also used for ftruncate calls which can extend the file.
668 * To completely minimize the possible extra StoreMini RPC, we really
669 * should keep the ExtendedPos as well and clear this flag if we
670 * truncate below that value before we store the file back.
672 avc->f.states |= CExtendedFile;
673 avc->f.m.Length = alen;
676 #if (defined(AFS_SUN5_ENV))
678 /* Zero unused portion of last page */
679 osi_VM_PreTruncate(avc, alen, acred);
683 #if (defined(AFS_SUN5_ENV))
684 ObtainWriteLock(&avc->vlock, 546);
685 avc->activeV++; /* Block new getpages */
686 ReleaseWriteLock(&avc->vlock);
689 ReleaseWriteLock(&avc->lock);
692 /* Flush pages beyond end-of-file. */
693 osi_VM_Truncate(avc, alen, acred);
696 ObtainWriteLock(&avc->lock, 79);
698 avc->f.m.Length = alen;
700 if (alen < avc->f.truncPos)
701 avc->f.truncPos = alen;
702 code = DVHash(&avc->f.fid);
704 /* block out others from screwing with this table */
705 ObtainWriteLock(&afs_xdcache, 287);
708 for (index = afs_dvhashTbl[code]; index != NULLIDX;) {
709 if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
710 tdc = afs_GetDSlot(index, 0);
711 ReleaseReadLock(&tdc->tlock);
712 if (!FidCmp(&tdc->f.fid, &avc->f.fid))
716 index = afs_dvnextTbl[index];
719 /* Now allocate space where we can save those dcache entries, and
720 * do a second pass over them.. Since we're holding xdcache, it
721 * shouldn't be changing.
723 tdcArray = osi_Alloc(dcCount * sizeof(struct dcache *));
726 for (index = afs_dvhashTbl[code]; index != NULLIDX;) {
727 if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
728 tdc = afs_GetDSlot(index, 0);
729 ReleaseReadLock(&tdc->tlock);
730 if (!FidCmp(&tdc->f.fid, &avc->f.fid)) {
731 /* same file, and modified, we'll store it back */
732 if (dcPos < dcCount) {
733 tdcArray[dcPos++] = tdc;
741 index = afs_dvnextTbl[index];
744 ReleaseWriteLock(&afs_xdcache);
746 /* Now we loop over the array of dcache entries and truncate them */
747 for (index = 0; index < dcPos; index++) {
748 struct osi_file *tfile;
750 tdc = tdcArray[index];
752 newSize = alen - AFS_CHUNKTOBASE(tdc->f.chunk);
755 ObtainSharedLock(&tdc->lock, 672);
756 if (newSize < tdc->f.chunkBytes && newSize < MAX_AFS_UINT32) {
757 UpgradeSToWLock(&tdc->lock, 673);
758 tfile = afs_CFileOpen(&tdc->f.inode);
759 afs_CFileTruncate(tfile, (afs_int32)newSize);
760 afs_CFileClose(tfile);
761 afs_AdjustSize(tdc, (afs_int32)newSize);
762 if (alen < tdc->validPos) {
763 if (alen < AFS_CHUNKTOBASE(tdc->f.chunk))
766 tdc->validPos = alen;
768 ConvertWToSLock(&tdc->lock);
770 ReleaseSharedLock(&tdc->lock);
774 osi_Free(tdcArray, dcCount * sizeof(struct dcache *));
776 #if (defined(AFS_SUN5_ENV))
777 ObtainWriteLock(&avc->vlock, 547);
778 if (--avc->activeV == 0 && (avc->vstates & VRevokeWait)) {
779 avc->vstates &= ~VRevokeWait;
780 afs_osi_Wakeup((char *)&avc->vstates);
782 ReleaseWriteLock(&avc->vlock);