2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #include <afs/param.h>
28 extern void afsi_log(char *pattern, ...);
31 osi_mutex_t cm_bufGetMutex;
32 #ifdef AFS_FREELANCE_CLIENT
33 extern osi_mutex_t cm_Freelance_Lock;
37 /* we can access connp->serverp without holding a lock because that
38 never changes since the connection is made. */
39 #define SERVERHAS64BIT(connp) (!((connp)->serverp->flags & CM_SERVERFLAG_NO64BIT))
40 #define SET_SERVERHASNO64BIT(connp) (cm_SetServerNo64Bit((connp)->serverp, TRUE))
42 #define SERVERHAS64BIT(connp) (FALSE)
43 #define SET_SERVERHASNO64BIT(connp) (FALSE)
46 /* functions called back from the buffer package when reading or writing data,
47 * or when holding or releasing a vnode pointer.
49 long cm_BufWrite(void *vfidp, osi_hyper_t *offsetp, long length, long flags,
50 cm_user_t *userp, cm_req_t *reqp)
52 /* store the data back from this buffer; the buffer is locked and held,
53 * but the vnode involved isn't locked, yet. It is held by its
54 * reference from the buffer, which won't change until the buffer is
55 * released by our caller. Thus, we don't have to worry about holding
59 cm_fid_t *fidp = vfidp;
63 AFSFetchStatus outStatus;
64 AFSStoreStatus inStatus;
68 struct rx_call *callp;
69 struct rx_connection *rxconnp;
76 cm_bulkIO_t biod; /* bulk IO descriptor */
77 int require_64bit_ops = 0;
79 osi_assert(userp != NULL);
81 /* now, the buffer may or may not be filled with good data (buf_GetNew
82 * drops lots of locks, and may indeed return a properly initialized
83 * buffer, although more likely it will just return a new, empty, buffer.
85 scp = cm_FindSCache(fidp);
87 return CM_ERROR_NOSUCHFILE; /* shouldn't happen */
89 cm_AFSFidFromFid(&tfid, fidp);
91 lock_ObtainMutex(&scp->mx);
93 code = cm_SetupStoreBIOD(scp, offsetp, length, &biod, userp, reqp);
95 osi_Log1(afsd_logp, "cm_SetupStoreBIOD code %x", code);
96 lock_ReleaseMutex(&scp->mx);
97 cm_ReleaseSCache(scp);
101 if (biod.length == 0) {
102 osi_Log0(afsd_logp, "cm_SetupStoreBIOD length 0");
103 lock_ReleaseMutex(&scp->mx);
104 cm_ReleaseBIOD(&biod, 1); /* should be a NOOP */
105 cm_ReleaseSCache(scp);
109 /* Serialize StoreData RPC's; for rationale see cm_scache.c */
110 (void) cm_SyncOp(scp, NULL, userp, reqp, 0, CM_SCACHESYNC_STOREDATA_EXCL);
112 /* prepare the output status for the store */
113 scp->mask |= CM_SCACHEMASK_CLIENTMODTIME;
114 cm_StatusFromAttr(&inStatus, scp, NULL);
115 truncPos = scp->length;
116 if ((scp->mask & CM_SCACHEMASK_TRUNCPOS)
117 && LargeIntegerLessThan(scp->truncPos, truncPos))
118 truncPos = scp->truncPos;
119 scp->mask &= ~CM_SCACHEMASK_TRUNCPOS;
121 /* compute how many bytes to write from this buffer */
122 thyper = LargeIntegerSubtract(scp->length, biod.offset);
123 if (LargeIntegerLessThanZero(thyper)) {
124 /* entire buffer is past EOF */
128 /* otherwise write out part of buffer before EOF, but not
129 * more than bufferSize bytes.
131 if (LargeIntegerGreaterThan(thyper,
132 ConvertLongToLargeInteger(biod.length))) {
133 nbytes = biod.length;
135 /* if thyper is less than or equal to biod.length, then we
136 can safely assume that the value fits in a long. */
137 nbytes = thyper.LowPart;
141 if (LargeIntegerGreaterThan(LargeIntegerAdd(biod.offset,
142 ConvertLongToLargeInteger(nbytes)),
143 ConvertLongToLargeInteger(LONG_MAX)) ||
144 LargeIntegerGreaterThan(truncPos,
145 ConvertLongToLargeInteger(LONG_MAX))) {
146 require_64bit_ops = 1;
149 lock_ReleaseMutex(&scp->mx);
151 /* now we're ready to do the store operation */
153 code = cm_Conn(&scp->fid, userp, reqp, &connp);
158 rxconnp = cm_GetRxConn(connp);
159 callp = rx_NewCall(rxconnp);
160 rx_PutConnection(rxconnp);
162 #ifdef AFS_LARGEFILES
163 if (SERVERHAS64BIT(connp)) {
164 osi_Log4(afsd_logp, "CALL StoreData64 scp 0x%p, offset 0x%x:%08x, length 0x%x",
165 scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
167 code = StartRXAFS_StoreData64(callp, &tfid, &inStatus,
168 biod.offset.QuadPart,
173 if (require_64bit_ops) {
174 osi_Log0(afsd_logp, "Skipping StoreData. The operation requires StoreData64");
175 code = CM_ERROR_TOOBIG;
177 osi_Log4(afsd_logp, "CALL StoreData scp 0x%p, offset 0x%x:%08x, length 0x%x",
178 scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
180 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
181 biod.offset.LowPart, nbytes, truncPos.LowPart);
185 osi_Log4(afsd_logp, "CALL StoreData scp 0x%p, offset 0x%x:%08x, length 0x%x",
186 scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
188 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
189 biod.offset.LowPart, nbytes, truncPos.LowPart);
193 /* write the data from the the list of buffers */
197 qdp = biod.bufListEndp;
199 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
200 osi_assert(qdp != NULL);
201 bufp = osi_GetQData(qdp);
202 bufferp = bufp->datap;
204 if (wbytes > cm_data.buf_blockSize)
205 wbytes = cm_data.buf_blockSize;
207 /* write out wbytes of data from bufferp */
208 temp = rx_Write(callp, bufferp, wbytes);
209 if (temp != wbytes) {
210 osi_Log3(afsd_logp, "rx_Write failed bp 0x%p, %d != %d",bufp,temp,wbytes);
214 osi_Log2(afsd_logp, "rx_Write succeeded bp 0x%p, %d",bufp,temp);
217 } /* while more bytes to write */
218 } /* if RPC started successfully */
220 osi_Log2(afsd_logp, "StartRXAFS_StoreData?? scp 0x%p failed (%lX)",scp,code);
224 if (SERVERHAS64BIT(connp)) {
225 code = EndRXAFS_StoreData64(callp, &outStatus, &volSync);
227 osi_Log2(afsd_logp, "EndRXAFS_StoreData64 scp 0x%p failed (%lX)", scp, code);
229 code = EndRXAFS_StoreData(callp, &outStatus, &volSync);
231 osi_Log2(afsd_logp, "EndRXAFS_StoreData scp 0x%p failed (%lX)",scp,code);
235 code = rx_EndCall(callp, code);
237 #ifdef AFS_LARGEFILES
238 if (code == RXGEN_OPCODE && SERVERHAS64BIT(connp)) {
239 SET_SERVERHASNO64BIT(connp);
244 } while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
246 code = cm_MapRPCError(code, reqp);
249 osi_Log2(afsd_logp, "CALL StoreData FAILURE scp 0x%p, code 0x%x", scp, code);
251 osi_Log1(afsd_logp, "CALL StoreData SUCCESS scp 0x%p", scp);
253 /* now, clean up our state */
254 lock_ObtainMutex(&scp->mx);
256 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
260 /* now, here's something a little tricky: in AFS 3, a dirty
261 * length can't be directly stored, instead, a dirty chunk is
262 * stored that sets the file's size (by writing and by using
263 * the truncate-first option in the store call).
265 * At this point, we've just finished a store, and so the trunc
266 * pos field is clean. If the file's size at the server is at
267 * least as big as we think it should be, then we turn off the
268 * length dirty bit, since all the other dirty buffers must
269 * precede this one in the file.
271 * The file's desired size shouldn't be smaller than what's
272 * stored at the server now, since we just did the trunc pos
275 * We have to turn off the length dirty bit as soon as we can,
276 * so that we see updates made by other machines.
279 if (SERVERHAS64BIT(connp)) {
280 t.LowPart = outStatus.Length;
281 t.HighPart = outStatus.Length_hi;
283 t = ConvertLongToLargeInteger(outStatus.Length);
286 if (LargeIntegerGreaterThanOrEqualTo(t, scp->length))
287 scp->mask &= ~CM_SCACHEMASK_LENGTH;
289 cm_MergeStatus(scp, &outStatus, &volSync, userp, 0);
291 if (code == CM_ERROR_SPACE)
292 scp->flags |= CM_SCACHEFLAG_OUTOFSPACE;
293 else if (code == CM_ERROR_QUOTA)
294 scp->flags |= CM_SCACHEFLAG_OVERQUOTA;
296 lock_ReleaseMutex(&scp->mx);
297 cm_ReleaseBIOD(&biod, 1);
298 cm_ReleaseSCache(scp);
304 * Truncate the file, by sending a StoreData RPC with zero length.
306 * Called with scp locked. Releases and re-obtains the lock.
308 long cm_StoreMini(cm_scache_t *scp, cm_user_t *userp, cm_req_t *reqp)
310 AFSFetchStatus outStatus;
311 AFSStoreStatus inStatus;
315 osi_hyper_t truncPos;
317 struct rx_call *callp;
318 struct rx_connection *rxconnp;
319 int require_64bit_ops = 0;
321 /* Serialize StoreData RPC's; for rationale see cm_scache.c */
322 (void) cm_SyncOp(scp, NULL, userp, reqp, 0,
323 CM_SCACHESYNC_STOREDATA_EXCL);
325 /* prepare the output status for the store */
326 inStatus.Mask = AFS_SETMODTIME;
327 inStatus.ClientModTime = scp->clientModTime;
328 scp->mask &= ~CM_SCACHEMASK_CLIENTMODTIME;
330 /* calculate truncation position */
331 truncPos = scp->length;
332 if ((scp->mask & CM_SCACHEMASK_TRUNCPOS)
333 && LargeIntegerLessThan(scp->truncPos, truncPos))
334 truncPos = scp->truncPos;
335 scp->mask &= ~CM_SCACHEMASK_TRUNCPOS;
337 if (LargeIntegerGreaterThan(truncPos,
338 ConvertLongToLargeInteger(LONG_MAX))) {
340 require_64bit_ops = 1;
343 lock_ReleaseMutex(&scp->mx);
345 cm_AFSFidFromFid(&tfid, &scp->fid);
347 /* now we're ready to do the store operation */
349 code = cm_Conn(&scp->fid, userp, reqp, &connp);
354 rxconnp = cm_GetRxConn(connp);
355 callp = rx_NewCall(rxconnp);
356 rx_PutConnection(rxconnp);
358 #ifdef AFS_LARGEFILES
359 if (SERVERHAS64BIT(connp)) {
360 code = StartRXAFS_StoreData64(callp, &tfid, &inStatus,
361 0, 0, truncPos.QuadPart);
363 if (require_64bit_ops) {
364 code = CM_ERROR_TOOBIG;
366 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
367 0, 0, truncPos.LowPart);
371 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
372 0, 0, truncPos.LowPart);
376 if (SERVERHAS64BIT(connp))
377 code = EndRXAFS_StoreData64(callp, &outStatus, &volSync);
379 code = EndRXAFS_StoreData(callp, &outStatus, &volSync);
381 code = rx_EndCall(callp, code);
383 #ifdef AFS_LARGEFILES
384 if (code == RXGEN_OPCODE && SERVERHAS64BIT(connp)) {
385 SET_SERVERHASNO64BIT(connp);
390 } while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
391 code = cm_MapRPCError(code, reqp);
393 /* now, clean up our state */
394 lock_ObtainMutex(&scp->mx);
396 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
401 * For explanation of handling of CM_SCACHEMASK_LENGTH,
404 if (SERVERHAS64BIT(connp)) {
405 t.HighPart = outStatus.Length_hi;
406 t.LowPart = outStatus.Length;
408 t = ConvertLongToLargeInteger(outStatus.Length);
411 if (LargeIntegerGreaterThanOrEqualTo(t, scp->length))
412 scp->mask &= ~CM_SCACHEMASK_LENGTH;
413 cm_MergeStatus(scp, &outStatus, &volSync, userp, 0);
419 long cm_BufRead(cm_buf_t *bufp, long nbytes, long *bytesReadp, cm_user_t *userp)
421 *bytesReadp = cm_data.buf_blockSize;
423 /* now return a code that means that I/O is done */
427 /* stabilize scache entry, and return with it locked so
430 long cm_BufStabilize(void *parmp, cm_user_t *userp, cm_req_t *reqp)
437 lock_ObtainMutex(&scp->mx);
438 code = cm_SyncOp(scp, NULL, userp, reqp, 0,
439 CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_SETSIZE);
441 lock_ReleaseMutex(&scp->mx);
448 /* undoes the work that cm_BufStabilize does: releases lock so things can change again */
449 long cm_BufUnstabilize(void *parmp, cm_user_t *userp)
455 lock_ReleaseMutex(&scp->mx);
457 /* always succeeds */
461 cm_buf_ops_t cm_bufOps = {
468 long cm_ValidateDCache(void)
470 return buf_ValidateBuffers();
473 long cm_ShutdownDCache(void)
478 int cm_InitDCache(int newFile, long chunkSize, afs_uint64 nbuffers)
480 lock_InitializeMutex(&cm_bufGetMutex, "buf_Get mutex");
481 return buf_Init(newFile, &cm_bufOps, nbuffers);
484 /* check to see if we have an up-to-date buffer. The buffer must have
485 * previously been obtained by calling buf_Get.
487 * Make sure we have a callback, and that the dataversion matches.
489 * Scp must be locked.
491 * Bufp *may* be locked.
493 int cm_HaveBuffer(cm_scache_t *scp, cm_buf_t *bufp, int isBufLocked)
496 if (!cm_HaveCallback(scp))
498 if ((bufp->cmFlags & (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED)) == (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED))
500 if (bufp->dataVersion == scp->dataVersion)
503 code = lock_TryMutex(&bufp->mx);
505 /* don't have the lock, and can't lock it, then
512 /* remember dirty flag for later */
513 code = bufp->flags & CM_BUF_DIRTY;
515 /* release lock if we obtained it here */
517 lock_ReleaseMutex(&bufp->mx);
519 /* if buffer was dirty, buffer is acceptable for use */
526 /* used when deciding whether to do a prefetch or not */
527 long cm_CheckFetchRange(cm_scache_t *scp, osi_hyper_t *startBasep, long length,
528 cm_user_t *up, cm_req_t *reqp, osi_hyper_t *realBasep)
536 /* now scan all buffers in the range, looking for any that look like
541 lock_ObtainMutex(&scp->mx);
543 /* get callback so we can do a meaningful dataVersion comparison */
544 code = cm_SyncOp(scp, NULL, up, reqp, 0,
545 CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
547 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
548 lock_ReleaseMutex(&scp->mx);
552 if (LargeIntegerGreaterThanOrEqualTo(tbase, scp->length)) {
553 /* we're past the end of file */
557 bp = buf_Find(scp, &tbase);
558 /* We cheat slightly by not locking the bp mutex. */
560 if ((bp->cmFlags & (CM_BUF_CMFETCHING | CM_BUF_CMSTORING)) == 0
561 && bp->dataVersion != scp->dataVersion)
568 /* if this buffer is essentially guaranteed to require a fetch,
569 * break out here and return this position.
574 toffset.LowPart = cm_data.buf_blockSize;
575 toffset.HighPart = 0;
576 tbase = LargeIntegerAdd(toffset, tbase);
577 length -= cm_data.buf_blockSize;
580 /* if we get here, either everything is fine or stop stopped us at a
581 * particular buffer in the range that definitely needs to be fetched.
584 /* return non-zero code since realBasep won't be valid */
585 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
589 /* successfully found a page that will need fetching */
593 lock_ReleaseMutex(&scp->mx);
597 void cm_BkgStore(cm_scache_t *scp, long p1, long p2, long p3, long p4,
605 req.flags |= CM_REQ_NORETRY;
607 toffset.LowPart = p1;
608 toffset.HighPart = p2;
611 osi_Log4(afsd_logp, "Starting BKG store scp 0x%p, offset 0x%x:%08x, length 0x%x", scp, p2, p1, p3);
613 cm_BufWrite(&scp->fid, &toffset, length, /* flags */ 0, userp, &req);
615 lock_ObtainMutex(&scp->mx);
616 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_ASYNCSTORE);
617 lock_ReleaseMutex(&scp->mx);
620 /* Called with scp locked */
621 void cm_ClearPrefetchFlag(long code, cm_scache_t *scp, osi_hyper_t *base)
626 thyper.LowPart = cm_chunkSize;
628 thyper = LargeIntegerAdd(*base, thyper);
629 thyper.LowPart &= (-cm_chunkSize);
630 if (LargeIntegerGreaterThan(*base, scp->prefetch.base))
631 scp->prefetch.base = *base;
632 if (LargeIntegerGreaterThan(thyper, scp->prefetch.end))
633 scp->prefetch.end = thyper;
635 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
638 /* do the prefetch */
639 void cm_BkgPrefetch(cm_scache_t *scp, long p1, long p2, long p3, long p4,
646 int cpff = 0; /* cleared prefetch flag */
650 req.flags |= CM_REQ_NORETRY;
656 osi_Log2(afsd_logp, "Starting BKG prefetch scp 0x%p, base 0x%x", scp, p1);
658 code = buf_Get(scp, &base, &bp);
660 lock_ObtainMutex(&scp->mx);
662 if (code || (bp->cmFlags & CM_BUF_CMFETCHING)) {
663 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
664 lock_ReleaseMutex(&scp->mx);
668 code = cm_GetBuffer(scp, bp, &cpff, userp, &req);
670 cm_ClearPrefetchFlag(code, scp, &base);
671 lock_ReleaseMutex(&scp->mx);
676 /* a read was issued to offsetp, and we have to determine whether we should
679 void cm_ConsiderPrefetch(cm_scache_t *scp, osi_hyper_t *offsetp,
680 cm_user_t *userp, cm_req_t *reqp)
683 osi_hyper_t realBase;
684 osi_hyper_t readBase;
687 /* round up to chunk boundary */
688 readBase.LowPart += (cm_chunkSize-1);
689 readBase.LowPart &= (-cm_chunkSize);
691 lock_ObtainMutex(&scp->mx);
692 if ((scp->flags & CM_SCACHEFLAG_PREFETCHING)
693 || LargeIntegerLessThanOrEqualTo(readBase, scp->prefetch.base)) {
694 lock_ReleaseMutex(&scp->mx);
697 scp->flags |= CM_SCACHEFLAG_PREFETCHING;
699 /* start the scan at the latter of the end of this read or
700 * the end of the last fetched region.
702 if (LargeIntegerGreaterThan(scp->prefetch.end, readBase))
703 readBase = scp->prefetch.end;
705 lock_ReleaseMutex(&scp->mx);
707 code = cm_CheckFetchRange(scp, &readBase, cm_chunkSize, userp, reqp,
710 return; /* can't find something to prefetch */
712 osi_Log2(afsd_logp, "BKG Prefetch request scp 0x%p, base 0x%x",
713 scp, realBase.LowPart);
715 cm_QueueBKGRequest(scp, cm_BkgPrefetch, realBase.LowPart,
716 realBase.HighPart, cm_chunkSize, 0, userp);
719 /* scp must be locked; temporarily unlocked during processing.
720 * If returns 0, returns buffers held in biop, and with
721 * CM_BUF_CMSTORING set.
723 * Caller *must* set CM_BUF_WRITING and reset the over.hEvent field if the
724 * buffer is ever unlocked before CM_BUF_DIRTY is cleared. And if
725 * CM_BUF_WRITING is ever viewed by anyone, then it must be cleared, sleepers
726 * must be woken, and the event must be set when the I/O is done. All of this
727 * is required so that buf_WaitIO synchronizes properly with the buffer as it
728 * is being written out.
730 long cm_SetupStoreBIOD(cm_scache_t *scp, osi_hyper_t *inOffsetp, long inSize,
731 cm_bulkIO_t *biop, cm_user_t *userp, cm_req_t *reqp)
734 osi_queueData_t *qdp;
737 osi_hyper_t scanStart; /* where to start scan for dirty pages */
738 osi_hyper_t scanEnd; /* where to stop scan for dirty pages */
739 osi_hyper_t firstModOffset; /* offset of first modified page in range */
742 long flags; /* flags to cm_SyncOp */
744 /* clear things out */
745 biop->scp = scp; /* don't hold */
746 biop->offset = *inOffsetp;
748 biop->bufListp = NULL;
749 biop->bufListEndp = NULL;
752 /* reserve a chunk's worth of buffers */
753 lock_ReleaseMutex(&scp->mx);
754 buf_ReserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
755 lock_ObtainMutex(&scp->mx);
758 for (temp = 0; temp < inSize; temp += cm_data.buf_blockSize, bufp = NULL) {
760 thyper.LowPart = temp;
761 tbase = LargeIntegerAdd(*inOffsetp, thyper);
763 bufp = buf_Find(scp, &tbase);
765 /* get buffer mutex and scp mutex safely */
766 lock_ReleaseMutex(&scp->mx);
767 lock_ObtainMutex(&bufp->mx);
768 lock_ObtainMutex(&scp->mx);
770 flags = CM_SCACHESYNC_NEEDCALLBACK
771 | CM_SCACHESYNC_GETSTATUS
772 | CM_SCACHESYNC_STOREDATA
773 | CM_SCACHESYNC_BUFLOCKED;
774 code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
776 lock_ReleaseMutex(&bufp->mx);
778 buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
782 /* if the buffer is dirty, we're done */
783 if (bufp->flags & CM_BUF_DIRTY) {
784 osi_assertx(!(bufp->flags & CM_BUF_WRITING),
785 "WRITING w/o CMSTORING in SetupStoreBIOD");
786 bufp->flags |= CM_BUF_WRITING;
790 /* this buffer is clean, so there's no reason to process it */
791 cm_SyncOpDone(scp, bufp, flags);
792 lock_ReleaseMutex(&bufp->mx);
799 /* if we get here, if bufp is null, we didn't find any dirty buffers
800 * that weren't already being stored back, so we just quit now.
806 /* don't need buffer mutex any more */
807 lock_ReleaseMutex(&bufp->mx);
809 /* put this element in the list */
811 osi_SetQData(qdp, bufp);
812 /* don't have to hold bufp, since held by buf_Find above */
813 osi_QAddH((osi_queue_t **) &biop->bufListp,
814 (osi_queue_t **) &biop->bufListEndp,
816 biop->length = cm_data.buf_blockSize;
817 firstModOffset = bufp->offset;
818 biop->offset = firstModOffset;
820 /* compute the window surrounding *inOffsetp of size cm_chunkSize */
821 scanStart = *inOffsetp;
822 scanStart.LowPart &= (-cm_chunkSize);
823 thyper.LowPart = cm_chunkSize;
825 scanEnd = LargeIntegerAdd(scanStart, thyper);
827 flags = CM_SCACHESYNC_NEEDCALLBACK
828 | CM_SCACHESYNC_GETSTATUS
829 | CM_SCACHESYNC_STOREDATA
830 | CM_SCACHESYNC_BUFLOCKED
831 | CM_SCACHESYNC_NOWAIT;
833 /* start by looking backwards until scanStart */
834 thyper.HighPart = 0; /* hyper version of cm_data.buf_blockSize */
835 thyper.LowPart = cm_data.buf_blockSize;
836 tbase = LargeIntegerSubtract(firstModOffset, thyper);
837 while(LargeIntegerGreaterThanOrEqualTo(tbase, scanStart)) {
838 /* see if we can find the buffer */
839 bufp = buf_Find(scp, &tbase);
843 /* try to lock it, and quit if we can't (simplifies locking) */
844 lock_ReleaseMutex(&scp->mx);
845 code = lock_TryMutex(&bufp->mx);
846 lock_ObtainMutex(&scp->mx);
852 code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
854 lock_ReleaseMutex(&bufp->mx);
859 if (!(bufp->flags & CM_BUF_DIRTY)) {
860 /* buffer is clean, so we shouldn't add it */
861 cm_SyncOpDone(scp, bufp, flags);
862 lock_ReleaseMutex(&bufp->mx);
867 /* don't need buffer mutex any more */
868 lock_ReleaseMutex(&bufp->mx);
870 /* we have a dirty buffer ready for storing. Add it to the tail
871 * of the list, since it immediately precedes all of the disk
872 * addresses we've already collected.
875 osi_SetQData(qdp, bufp);
876 /* no buf_hold necessary, since we have it held from buf_Find */
877 osi_QAddT((osi_queue_t **) &biop->bufListp,
878 (osi_queue_t **) &biop->bufListEndp,
881 /* update biod info describing the transfer */
882 biop->offset = LargeIntegerSubtract(biop->offset, thyper);
883 biop->length += cm_data.buf_blockSize;
885 /* update loop pointer */
886 tbase = LargeIntegerSubtract(tbase, thyper);
887 } /* while loop looking for pages preceding the one we found */
889 /* now, find later dirty, contiguous pages, and add them to the list */
890 thyper.HighPart = 0; /* hyper version of cm_data.buf_blockSize */
891 thyper.LowPart = cm_data.buf_blockSize;
892 tbase = LargeIntegerAdd(firstModOffset, thyper);
893 while(LargeIntegerLessThan(tbase, scanEnd)) {
894 /* see if we can find the buffer */
895 bufp = buf_Find(scp, &tbase);
899 /* try to lock it, and quit if we can't (simplifies locking) */
900 lock_ReleaseMutex(&scp->mx);
901 code = lock_TryMutex(&bufp->mx);
902 lock_ObtainMutex(&scp->mx);
908 code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
910 lock_ReleaseMutex(&bufp->mx);
915 if (!(bufp->flags & CM_BUF_DIRTY)) {
916 /* buffer is clean, so we shouldn't add it */
917 cm_SyncOpDone(scp, bufp, flags);
918 lock_ReleaseMutex(&bufp->mx);
923 /* don't need buffer mutex any more */
924 lock_ReleaseMutex(&bufp->mx);
926 /* we have a dirty buffer ready for storing. Add it to the head
927 * of the list, since it immediately follows all of the disk
928 * addresses we've already collected.
931 osi_SetQData(qdp, bufp);
932 /* no buf_hold necessary, since we have it held from buf_Find */
933 osi_QAddH((osi_queue_t **) &biop->bufListp,
934 (osi_queue_t **) &biop->bufListEndp,
937 /* update biod info describing the transfer */
938 biop->length += cm_data.buf_blockSize;
940 /* update loop pointer */
941 tbase = LargeIntegerAdd(tbase, thyper);
942 } /* while loop looking for pages following the first page we found */
944 /* finally, we're done */
948 /* scp must be locked; temporarily unlocked during processing.
949 * If returns 0, returns buffers held in biop, and with
950 * CM_BUF_CMFETCHING flags set.
951 * If an error is returned, we don't return any buffers.
953 long cm_SetupFetchBIOD(cm_scache_t *scp, osi_hyper_t *offsetp,
954 cm_bulkIO_t *biop, cm_user_t *up, cm_req_t *reqp)
958 osi_hyper_t toffset; /* a long long temp variable */
959 osi_hyper_t pageBase; /* base offset we're looking at */
960 osi_queueData_t *qdp; /* one temp queue structure */
961 osi_queueData_t *tqdp; /* another temp queue structure */
962 long collected; /* how many bytes have been collected */
965 osi_hyper_t fileSize; /* the # of bytes in the file */
966 osi_queueData_t *heldBufListp; /* we hold all buffers in this list */
967 osi_queueData_t *heldBufListEndp; /* first one */
971 biop->offset = *offsetp;
972 /* null out the list of buffers */
973 biop->bufListp = biop->bufListEndp = NULL;
976 /* first lookup the file's length, so we know when to stop */
977 code = cm_SyncOp(scp, NULL, up, reqp, 0,
978 CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
982 /* copy out size, since it may change */
983 fileSize = scp->serverLength;
985 lock_ReleaseMutex(&scp->mx);
988 collected = pageBase.LowPart & (cm_chunkSize - 1);
990 heldBufListEndp = NULL;
993 * Obtaining buffers can cause dirty buffers to be recycled, which
994 * can cause a storeback, so cannot be done while we have buffers
997 * To get around this, we get buffers twice. Before reserving buffers,
998 * we obtain and release each one individually. After reserving
999 * buffers, we try to obtain them again, but only by lookup, not by
1000 * recycling. If a buffer has gone away while we were waiting for
1001 * the others, we just use whatever buffers we already have.
1003 * On entry to this function, we are already holding a buffer, so we
1004 * can't wait for reservation. So we call buf_TryReserveBuffers()
1005 * instead. Not only that, we can't really even call buf_Get(), for
1006 * the same reason. We can't avoid that, though. To avoid deadlock
1007 * we allow only one thread to be executing the buf_Get()-buf_Release()
1008 * sequence at a time.
1011 // lock_ObtainMutex(&cm_bufGetMutex);
1012 /* first hold all buffers, since we can't hold any locks in buf_Get */
1014 /* stop at chunk boundary */
1015 if (collected >= cm_chunkSize)
1018 /* see if the next page would be past EOF */
1019 if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
1022 code = buf_Get(scp, &pageBase, &tbp);
1024 //lock_ReleaseMutex(&cm_bufGetMutex);
1025 lock_ObtainMutex(&scp->mx);
1026 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
1032 toffset.HighPart = 0;
1033 toffset.LowPart = cm_data.buf_blockSize;
1034 pageBase = LargeIntegerAdd(toffset, pageBase);
1035 collected += cm_data.buf_blockSize;
1038 /* reserve a chunk's worth of buffers if possible */
1039 reserving = buf_TryReserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
1041 // lock_ReleaseMutex(&cm_bufGetMutex);
1043 pageBase = *offsetp;
1044 collected = pageBase.LowPart & (cm_chunkSize - 1);
1046 /* now hold all buffers, if they are still there */
1048 /* stop at chunk boundary */
1049 if (collected >= cm_chunkSize)
1052 /* see if the next page would be past EOF */
1053 if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
1056 tbp = buf_Find(scp, &pageBase);
1060 /* add the buffer to the list */
1061 qdp = osi_QDAlloc();
1062 osi_SetQData(qdp, tbp);
1063 osi_QAdd((osi_queue_t **)&heldBufListp, &qdp->q);
1064 if (!heldBufListEndp) heldBufListEndp = qdp;
1065 /* leave tbp held (from buf_Get) */
1070 collected += cm_data.buf_blockSize;
1071 toffset.HighPart = 0;
1072 toffset.LowPart = cm_data.buf_blockSize;
1073 pageBase = LargeIntegerAdd(toffset, pageBase);
1076 /* look at each buffer, adding it into the list if it looks idle and
1077 * filled with old data. One special case: wait for idle if it is the
1078 * first buffer since we really need that one for our caller to make
1082 collected = 0; /* now count how many we'll really use */
1083 for (tqdp = heldBufListEndp;
1085 tqdp = (osi_queueData_t *) osi_QPrev(&tqdp->q)) {
1086 /* get a ptr to the held buffer */
1087 tbp = osi_GetQData(tqdp);
1088 pageBase = tbp->offset;
1090 /* now lock the buffer lock */
1091 lock_ObtainMutex(&tbp->mx);
1092 lock_ObtainMutex(&scp->mx);
1094 /* don't bother fetching over data that is already current */
1095 if (tbp->dataVersion == scp->dataVersion) {
1096 /* we don't need this buffer, since it is current */
1097 lock_ReleaseMutex(&scp->mx);
1098 lock_ReleaseMutex(&tbp->mx);
1102 flags = CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_FETCHDATA
1103 | CM_SCACHESYNC_BUFLOCKED;
1105 flags |= CM_SCACHESYNC_NOWAIT;
1107 /* wait for the buffer to serialize, if required. Doesn't
1108 * release the scp or buffer lock(s) if NOWAIT is specified.
1110 code = cm_SyncOp(scp, tbp, up, reqp, 0, flags);
1112 lock_ReleaseMutex(&scp->mx);
1113 lock_ReleaseMutex(&tbp->mx);
1117 /* don't fetch over dirty buffers */
1118 if (tbp->flags & CM_BUF_DIRTY) {
1119 cm_SyncOpDone(scp, tbp, flags);
1120 lock_ReleaseMutex(&scp->mx);
1121 lock_ReleaseMutex(&tbp->mx);
1126 lock_ReleaseMutex(&scp->mx);
1127 lock_ReleaseMutex(&tbp->mx);
1129 /* add the buffer to the list */
1130 qdp = osi_QDAlloc();
1131 osi_SetQData(qdp, tbp);
1132 osi_QAdd((osi_queue_t **)&biop->bufListp, &qdp->q);
1133 if (!biop->bufListEndp)
1134 biop->bufListEndp = qdp;
1137 /* from now on, a failure just stops our collection process, but
1138 * we still do the I/O to whatever we've already managed to collect.
1141 collected += cm_data.buf_blockSize;
1144 /* now, we've held in biop->bufListp all the buffer's we're really
1145 * interested in. We also have holds left from heldBufListp, and we
1146 * now release those holds on the buffers.
1148 for (qdp = heldBufListp; qdp; qdp = tqdp) {
1149 tqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
1150 tbp = osi_GetQData(qdp);
1155 /* Caller expects this */
1156 lock_ObtainMutex(&scp->mx);
1158 /* if we got a failure setting up the first buffer, then we don't have
1159 * any side effects yet, and we also have failed an operation that the
1160 * caller requires to make any progress. Give up now.
1162 if (code && isFirst) {
1163 buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
1167 /* otherwise, we're still OK, and should just return the I/O setup we've
1170 biop->length = collected;
1171 biop->reserved = reserving;
1175 /* release a bulk I/O structure that was setup by cm_SetupFetchBIOD or by
1178 void cm_ReleaseBIOD(cm_bulkIO_t *biop, int isStore)
1182 osi_queueData_t *qdp;
1183 osi_queueData_t *nqdp;
1186 /* Give back reserved buffers */
1188 buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
1190 flags = CM_SCACHESYNC_NEEDCALLBACK;
1192 flags |= CM_SCACHESYNC_STOREDATA;
1194 flags |= CM_SCACHESYNC_FETCHDATA;
1197 for(qdp = biop->bufListp; qdp; qdp = nqdp) {
1198 /* lookup next guy first, since we're going to free this one */
1199 nqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
1201 /* extract buffer and free queue data */
1202 bufp = osi_GetQData(qdp);
1205 /* now, mark I/O as done, unlock the buffer and release it */
1206 lock_ObtainMutex(&bufp->mx);
1207 lock_ObtainMutex(&scp->mx);
1208 cm_SyncOpDone(scp, bufp, flags);
1210 /* turn off writing and wakeup users */
1212 if (bufp->flags & CM_BUF_WAITING) {
1213 osi_Log2(afsd_logp, "cm_ReleaseBIOD Waking [scp 0x%p] bp 0x%p", scp, bufp);
1214 osi_Wakeup((LONG_PTR) bufp);
1216 bufp->flags &= ~(CM_BUF_WRITING | CM_BUF_DIRTY);
1219 lock_ReleaseMutex(&scp->mx);
1220 lock_ReleaseMutex(&bufp->mx);
1224 /* clean things out */
1225 biop->bufListp = NULL;
1226 biop->bufListEndp = NULL;
1229 /* Fetch a buffer. Called with scp locked.
1230 * The scp is locked on return.
1232 long cm_GetBuffer(cm_scache_t *scp, cm_buf_t *bufp, int *cpffp, cm_user_t *up,
1236 afs_int32 nbytes; /* bytes in transfer */
1237 afs_int32 nbytes_hi = 0; /* high-order 32 bits of bytes in transfer */
1238 afs_int64 length_found = 0;
1239 long rbytes; /* bytes in rx_Read call */
1241 AFSFetchStatus afsStatus;
1242 AFSCallBack callback;
1245 cm_buf_t *tbufp; /* buf we're filling */
1246 osi_queueData_t *qdp; /* q element we're scanning */
1248 struct rx_call *callp;
1249 struct rx_connection *rxconnp;
1250 cm_bulkIO_t biod; /* bulk IO descriptor */
1254 int require_64bit_ops = 0;
1256 /* now, the buffer may or may not be filled with good data (buf_GetNew
1257 * drops lots of locks, and may indeed return a properly initialized
1258 * buffer, although more likely it will just return a new, empty, buffer.
1261 #ifdef AFS_FREELANCE_CLIENT
1263 // yj: if they're trying to get the /afs directory, we need to
1264 // handle it differently, since it's local rather than on any
1267 getroot = (scp==cm_data.rootSCachep);
1269 osi_Log1(afsd_logp,"GetBuffer returns cm_data.rootSCachep=%x",cm_data.rootSCachep);
1272 cm_AFSFidFromFid(&tfid, &scp->fid);
1274 code = cm_SetupFetchBIOD(scp, &bufp->offset, &biod, up, reqp);
1276 /* couldn't even get the first page setup properly */
1277 osi_Log1(afsd_logp, "SetupFetchBIOD failure code %d", code);
1281 /* once we get here, we have the callback in place, we know that no one
1282 * is fetching the data now. Check one last time that we still have
1283 * the wrong data, and then fetch it if we're still wrong.
1285 * We can lose a race condition and end up with biod.length zero, in
1286 * which case we just retry.
1288 if (bufp->dataVersion == scp->dataVersion || biod.length == 0) {
1289 osi_Log3(afsd_logp, "Bad DVs %d, %d or length 0x%x",
1290 bufp->dataVersion, scp->dataVersion, biod.length);
1291 if ((bufp->dataVersion == -1
1292 || bufp->dataVersion < scp->dataVersion)
1293 && LargeIntegerGreaterThanOrEqualTo(bufp->offset,
1294 scp->serverLength)) {
1295 if (bufp->dataVersion == -1)
1296 memset(bufp->datap, 0, cm_data.buf_blockSize);
1297 bufp->dataVersion = scp->dataVersion;
1299 lock_ReleaseMutex(&scp->mx);
1300 cm_ReleaseBIOD(&biod, 0);
1301 lock_ObtainMutex(&scp->mx);
1305 lock_ReleaseMutex(&scp->mx);
1307 if (LargeIntegerGreaterThan(LargeIntegerAdd(biod.offset,
1308 ConvertLongToLargeInteger(biod.length)),
1309 ConvertLongToLargeInteger(LONG_MAX))) {
1310 require_64bit_ops = 1;
1314 DPRINTF("cm_GetBuffer: fetching data scpDV=%d bufDV=%d scp=%x bp=%x dcp=%x\n",
1315 scp->dataVersion, bufp->dataVersion, scp, bufp, bufp->dcp);
1316 #endif /* DISKCACHE95 */
1318 #ifdef AFS_FREELANCE_CLIENT
1321 // if getroot then we don't need to make any calls
1322 // just return fake data
1324 if (cm_freelanceEnabled && getroot) {
1325 // setup the fake status
1326 afsStatus.InterfaceVersion = 0x1;
1327 afsStatus.FileType = 0x2;
1328 afsStatus.LinkCount = scp->linkCount;
1329 afsStatus.Length = cm_fakeDirSize;
1330 afsStatus.DataVersion = cm_data.fakeDirVersion;
1331 afsStatus.Author = 0x1;
1332 afsStatus.Owner = 0x0;
1333 afsStatus.CallerAccess = 0x9;
1334 afsStatus.AnonymousAccess = 0x9;
1335 afsStatus.UnixModeBits = 0x1ff;
1336 afsStatus.ParentVnode = 0x1;
1337 afsStatus.ParentUnique = 0x1;
1338 afsStatus.ResidencyMask = 0;
1339 afsStatus.ClientModTime = (afs_uint32)FakeFreelanceModTime;
1340 afsStatus.ServerModTime = (afs_uint32)FakeFreelanceModTime;
1341 afsStatus.Group = 0;
1342 afsStatus.SyncCounter = 0;
1343 afsStatus.dataVersionHigh = 0;
1344 afsStatus.lockCount = 0;
1345 afsStatus.Length_hi = 0;
1346 afsStatus.errorCode = 0;
1348 // once we're done setting up the status info,
1349 // we just fill the buffer pages with fakedata
1350 // from cm_FakeRootDir. Extra pages are set to
1353 lock_ObtainMutex(&cm_Freelance_Lock);
1354 t1 = bufp->offset.LowPart;
1355 qdp = biod.bufListEndp;
1357 tbufp = osi_GetQData(qdp);
1358 bufferp=tbufp->datap;
1359 memset(bufferp, 0, cm_data.buf_blockSize);
1360 t2 = cm_fakeDirSize - t1;
1361 if (t2>cm_data.buf_blockSize) t2=cm_data.buf_blockSize;
1363 memcpy(bufferp, cm_FakeRootDir+t1, t2);
1368 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
1371 lock_ReleaseMutex(&cm_Freelance_Lock);
1373 // once we're done, we skip over the part of the
1374 // code that does the ACTUAL fetching of data for
1377 goto fetchingcompleted;
1380 #endif /* AFS_FREELANCE_CLIENT */
1382 /* now make the call */
1384 code = cm_Conn(&scp->fid, up, reqp, &connp);
1388 rxconnp = cm_GetRxConn(connp);
1389 callp = rx_NewCall(rxconnp);
1390 rx_PutConnection(rxconnp);
1392 #ifdef AFS_LARGEFILES
1393 nbytes = nbytes_hi = 0;
1395 if (SERVERHAS64BIT(connp)) {
1396 osi_Log4(afsd_logp, "CALL FetchData64 scp 0x%p, off 0x%x:%08x, size 0x%x",
1397 scp, biod.offset.HighPart, biod.offset.LowPart, biod.length);
1399 code = StartRXAFS_FetchData64(callp, &tfid, biod.offset.QuadPart, biod.length);
1402 temp = rx_Read(callp, (char *) &nbytes_hi, sizeof(afs_int32));
1403 if (temp == sizeof(afs_int32)) {
1404 nbytes_hi = ntohl(nbytes_hi);
1407 code = callp->error;
1408 rx_EndCall(callp, code);
1414 if (code == RXGEN_OPCODE || !SERVERHAS64BIT(connp)) {
1415 if (require_64bit_ops) {
1416 osi_Log0(afsd_logp, "Skipping FetchData. Operation requires FetchData64");
1417 code = CM_ERROR_TOOBIG;
1420 rxconnp = cm_GetRxConn(connp);
1421 callp = rx_NewCall(rxconnp);
1422 rx_PutConnection(rxconnp);
1425 osi_Log3(afsd_logp, "CALL FetchData scp 0x%p, off 0x%x, size 0x%x",
1426 scp, biod.offset.LowPart, biod.length);
1428 code = StartRXAFS_FetchData(callp, &tfid, biod.offset.LowPart,
1431 SET_SERVERHASNO64BIT(connp);
1436 temp = rx_Read(callp, (char *)&nbytes, sizeof(afs_int32));
1437 if (temp == sizeof(afs_int32)) {
1438 nbytes = ntohl(nbytes);
1439 FillInt64(length_found, nbytes_hi, nbytes);
1440 if (length_found > biod.length)
1441 code = (callp->error < 0) ? callp->error : -1;
1443 code = (callp->error < 0) ? callp->error : -1;
1446 /* for the moment, nbytes_hi will always be 0 if code == 0
1447 because biod.length is a 32-bit quantity. */
1449 osi_Log3(afsd_logp, "CALL FetchData scp 0x%p, off 0x%x, size 0x%x",
1450 scp, biod.offset.LowPart, biod.length);
1452 code = StartRXAFS_FetchData(callp, &tfid, biod.offset.LowPart,
1455 /* now copy the data out of the pipe and put it in the buffer */
1457 temp = rx_Read(callp, (char *)&nbytes, sizeof(afs_int32));
1458 if (temp == sizeof(afs_int32)) {
1459 nbytes = ntohl(nbytes);
1460 if (nbytes > biod.length)
1461 code = (callp->error < 0) ? callp->error : -1;
1464 code = (callp->error < 0) ? callp->error : -1;
1469 qdp = biod.bufListEndp;
1471 tbufp = osi_GetQData(qdp);
1472 bufferp = tbufp->datap;
1476 /* fill nbytes of data from the pipe into the pages.
1477 * When we stop, qdp will point at the last page we're
1478 * dealing with, and bufferp will tell us where we
1479 * stopped. We'll need this info below when we clear
1480 * the remainder of the last page out (and potentially
1481 * clear later pages out, if we fetch past EOF).
1483 while (nbytes > 0) {
1484 /* assert that there are still more buffers;
1485 * our check above for nbytes being less than
1486 * biod.length should ensure this.
1488 osi_assert(bufferp != NULL);
1490 /* read rbytes of data */
1491 rbytes = (nbytes > cm_data.buf_blockSize? cm_data.buf_blockSize : nbytes);
1492 temp = rx_Read(callp, bufferp, rbytes);
1493 if (temp < rbytes) {
1494 code = (callp->error < 0) ? callp->error : -1;
1498 /* allow read-while-fetching.
1499 * if this is the last buffer, clear the
1500 * PREFETCHING flag, so the reader waiting for
1501 * this buffer will start a prefetch.
1503 tbufp->cmFlags |= CM_BUF_CMFULLYFETCHED;
1504 lock_ObtainMutex(&scp->mx);
1505 if (scp->flags & CM_SCACHEFLAG_WAITING) {
1506 osi_Log1(afsd_logp, "CM GetBuffer Waking scp 0x%p", scp);
1507 osi_Wakeup((LONG_PTR) &scp->flags);
1509 if (cpffp && !*cpffp && !osi_QPrev(&qdp->q)) {
1511 cm_ClearPrefetchFlag(0, scp, &biod.offset);
1513 lock_ReleaseMutex(&scp->mx);
1515 /* and adjust counters */
1518 /* and move to the next buffer */
1520 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
1522 tbufp = osi_GetQData(qdp);
1523 bufferp = tbufp->datap;
1531 /* zero out remainder of last pages, in case we are
1532 * fetching past EOF. We were fetching an integral #
1533 * of pages, but stopped, potentially in the middle of
1534 * a page. Zero the remainder of that page, and then
1535 * all of the rest of the pages.
1538 osi_assert((bufferp - tbufp->datap) < LONG_MAX);
1539 rbytes = (long) (bufferp - tbufp->datap);
1541 /* bytes left to zero */
1542 rbytes = cm_data.buf_blockSize - rbytes;
1545 memset(bufferp, 0, rbytes);
1546 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
1549 tbufp = osi_GetQData(qdp);
1550 bufferp = tbufp->datap;
1551 /* bytes to clear in this page */
1552 rbytes = cm_data.buf_blockSize;
1557 if (SERVERHAS64BIT(connp))
1558 code = EndRXAFS_FetchData64(callp, &afsStatus, &callback, &volSync);
1560 code = EndRXAFS_FetchData(callp, &afsStatus, &callback, &volSync);
1562 if (SERVERHAS64BIT(connp))
1563 osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData64 skipped due to error %d", code);
1565 osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData skipped due to error %d", code);
1569 code = rx_EndCall(callp, code);
1571 if (code == RXKADUNKNOWNKEY)
1572 osi_Log0(afsd_logp, "CALL EndCall returns RXKADUNKNOWNKEY");
1574 osi_Log0(afsd_logp, "CALL FetchData DONE");
1576 } while (cm_Analyze(connp, up, reqp, &scp->fid, &volSync, NULL, NULL, code));
1579 code = cm_MapRPCError(code, reqp);
1581 lock_ObtainMutex(&scp->mx);
1583 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_FETCHSTATUS);
1585 /* we know that no one else has changed the buffer, since we still have
1586 * the fetching flag on the buffers, and we have the scp locked again.
1587 * Copy in the version # into the buffer if we got code 0 back from the
1591 for(qdp = biod.bufListp;
1593 qdp = (osi_queueData_t *) osi_QNext(&qdp->q)) {
1594 tbufp = osi_GetQData(qdp);
1595 tbufp->dataVersion = afsStatus.DataVersion;
1598 /* write buffer out to disk cache */
1599 diskcache_Update(tbufp->dcp, tbufp->datap, cm_data.buf_blockSize,
1600 tbufp->dataVersion);
1601 #endif /* DISKCACHE95 */
1605 /* release scatter/gather I/O structure (buffers, locks) */
1606 lock_ReleaseMutex(&scp->mx);
1607 cm_ReleaseBIOD(&biod, 0);
1608 lock_ObtainMutex(&scp->mx);
1611 cm_MergeStatus(scp, &afsStatus, &volSync, up, 0);