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>
26 extern void afsi_log(char *pattern, ...);
29 osi_mutex_t cm_bufGetMutex;
30 #ifdef AFS_FREELANCE_CLIENT
31 extern osi_mutex_t cm_Freelance_Lock;
35 /* we can access connp->serverp without holding a lock because that
36 never changes since the connection is made. */
37 #define SERVERHAS64BIT(connp) (!((connp)->serverp->flags & CM_SERVERFLAG_NO64BIT))
38 #define SET_SERVERHASNO64BIT(connp) (cm_SetServerNo64Bit((connp)->serverp, TRUE))
40 #define SERVERHAS64BIT(connp) (FALSE)
41 #define SET_SERVERHASNO64BIT(connp) (FALSE)
44 /* functions called back from the buffer package when reading or writing data,
45 * or when holding or releasing a vnode pointer.
47 long cm_BufWrite(void *vscp, osi_hyper_t *offsetp, long length, long flags,
48 cm_user_t *userp, cm_req_t *reqp)
50 /* store the data back from this buffer; the buffer is locked and held,
51 * but the vnode involved isn't locked, yet. It is held by its
52 * reference from the buffer, which won't change until the buffer is
53 * released by our caller. Thus, we don't have to worry about holding
57 cm_scache_t *scp = vscp;
60 AFSFetchStatus outStatus;
61 AFSStoreStatus inStatus;
65 struct rx_call *callp;
66 struct rx_connection *rxconnp;
73 cm_bulkIO_t biod; /* bulk IO descriptor */
74 int require_64bit_ops = 0;
76 osi_assert(userp != NULL);
77 osi_assert(scp != NULL);
79 /* now, the buffer may or may not be filled with good data (buf_GetNew
80 * drops lots of locks, and may indeed return a properly initialized
81 * buffer, although more likely it will just return a new, empty, buffer.
84 lock_ObtainMutex(&scp->mx);
85 cm_AFSFidFromFid(&tfid, &scp->fid);
87 if (scp->flags & CM_SCACHEFLAG_DELETED) {
88 lock_ReleaseMutex(&scp->mx);
89 return CM_ERROR_NOSUCHFILE;
92 code = cm_SetupStoreBIOD(scp, offsetp, length, &biod, userp, reqp);
94 osi_Log1(afsd_logp, "cm_SetupStoreBIOD code %x", code);
95 lock_ReleaseMutex(&scp->mx);
99 if (biod.length == 0) {
100 osi_Log0(afsd_logp, "cm_SetupStoreBIOD length 0");
101 lock_ReleaseMutex(&scp->mx);
102 cm_ReleaseBIOD(&biod, 1, 0); /* should be a NOOP */
106 /* Serialize StoreData RPC's; for rationale see cm_scache.c */
107 (void) cm_SyncOp(scp, NULL, userp, reqp, 0, CM_SCACHESYNC_STOREDATA_EXCL);
109 /* prepare the output status for the store */
110 scp->mask |= CM_SCACHEMASK_CLIENTMODTIME;
111 cm_StatusFromAttr(&inStatus, scp, NULL);
112 truncPos = scp->length;
113 if ((scp->mask & CM_SCACHEMASK_TRUNCPOS)
114 && LargeIntegerLessThan(scp->truncPos, truncPos))
115 truncPos = scp->truncPos;
116 scp->mask &= ~CM_SCACHEMASK_TRUNCPOS;
118 /* compute how many bytes to write from this buffer */
119 thyper = LargeIntegerSubtract(scp->length, biod.offset);
120 if (LargeIntegerLessThanZero(thyper)) {
121 /* entire buffer is past EOF */
125 /* otherwise write out part of buffer before EOF, but not
126 * more than bufferSize bytes.
128 if (LargeIntegerGreaterThan(thyper,
129 ConvertLongToLargeInteger(biod.length))) {
130 nbytes = biod.length;
132 /* if thyper is less than or equal to biod.length, then we
133 can safely assume that the value fits in a long. */
134 nbytes = thyper.LowPart;
138 if (LargeIntegerGreaterThan(LargeIntegerAdd(biod.offset,
139 ConvertLongToLargeInteger(nbytes)),
140 ConvertLongToLargeInteger(LONG_MAX)) ||
141 LargeIntegerGreaterThan(truncPos,
142 ConvertLongToLargeInteger(LONG_MAX))) {
143 require_64bit_ops = 1;
146 lock_ReleaseMutex(&scp->mx);
148 /* now we're ready to do the store operation */
150 code = cm_Conn(&scp->fid, userp, reqp, &connp);
155 rxconnp = cm_GetRxConn(connp);
156 callp = rx_NewCall(rxconnp);
157 rx_PutConnection(rxconnp);
159 #ifdef AFS_LARGEFILES
160 if (SERVERHAS64BIT(connp)) {
161 osi_Log4(afsd_logp, "CALL StartRXAFS_StoreData64 scp 0x%p, offset 0x%x:%08x, length 0x%x",
162 scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
164 code = StartRXAFS_StoreData64(callp, &tfid, &inStatus,
165 biod.offset.QuadPart,
169 osi_Log1(afsd_logp, "CALL StartRXAFS_StoreData64 FAILURE, code 0x%x", code);
171 osi_Log0(afsd_logp, "CALL StartRXAFS_StoreData64 SUCCESS");
173 if (require_64bit_ops) {
174 osi_Log0(afsd_logp, "Skipping StartRXAFS_StoreData. The operation requires large file support in the server.");
175 code = CM_ERROR_TOOBIG;
177 osi_Log4(afsd_logp, "CALL StartRXAFS_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);
183 osi_Log1(afsd_logp, "CALL StartRXAFS_StoreData FAILURE, code 0x%x", code);
185 osi_Log0(afsd_logp, "CALL StartRXAFS_StoreData SUCCESS");
189 osi_Log4(afsd_logp, "CALL StartRXAFS_StoreData scp 0x%p, offset 0x%x:%08x, length 0x%x",
190 scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
192 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
193 biod.offset.LowPart, nbytes, truncPos.LowPart);
195 osi_Log1(afsd_logp, "CALL StartRXAFS_StoreData FAILURE, code 0x%x", code);
197 osi_Log0(afsd_logp, "CALL StartRXAFS_StoreData SUCCESS");
201 /* write the data from the the list of buffers */
205 qdp = biod.bufListEndp;
207 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
208 osi_assert(qdp != NULL);
209 bufp = osi_GetQData(qdp);
210 bufferp = bufp->datap;
212 if (wbytes > cm_data.buf_blockSize)
213 wbytes = cm_data.buf_blockSize;
215 /* write out wbytes of data from bufferp */
216 temp = rx_Write(callp, bufferp, wbytes);
217 if (temp != wbytes) {
218 osi_Log3(afsd_logp, "rx_Write failed bp 0x%p, %d != %d",bufp,temp,wbytes);
222 osi_Log2(afsd_logp, "rx_Write succeeded bp 0x%p, %d",bufp,temp);
225 } /* while more bytes to write */
226 } /* if RPC started successfully */
229 if (SERVERHAS64BIT(connp)) {
230 code = EndRXAFS_StoreData64(callp, &outStatus, &volSync);
232 osi_Log2(afsd_logp, "EndRXAFS_StoreData64 FAILURE scp 0x%p code %lX", scp, code);
234 osi_Log0(afsd_logp, "EndRXAFS_StoreData64 SUCCESS");
236 code = EndRXAFS_StoreData(callp, &outStatus, &volSync);
238 osi_Log2(afsd_logp, "EndRXAFS_StoreData FAILURE scp 0x%p code %lX",scp,code);
240 osi_Log0(afsd_logp, "EndRXAFS_StoreData SUCCESS");
244 code = rx_EndCall(callp, code);
246 #ifdef AFS_LARGEFILES
247 if (code == RXGEN_OPCODE && SERVERHAS64BIT(connp)) {
248 SET_SERVERHASNO64BIT(connp);
253 } while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
255 code = cm_MapRPCError(code, reqp);
258 osi_Log2(afsd_logp, "CALL StoreData FAILURE scp 0x%p, code 0x%x", scp, code);
260 osi_Log1(afsd_logp, "CALL StoreData SUCCESS scp 0x%p", scp);
262 /* now, clean up our state */
263 lock_ObtainMutex(&scp->mx);
265 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
269 /* now, here's something a little tricky: in AFS 3, a dirty
270 * length can't be directly stored, instead, a dirty chunk is
271 * stored that sets the file's size (by writing and by using
272 * the truncate-first option in the store call).
274 * At this point, we've just finished a store, and so the trunc
275 * pos field is clean. If the file's size at the server is at
276 * least as big as we think it should be, then we turn off the
277 * length dirty bit, since all the other dirty buffers must
278 * precede this one in the file.
280 * The file's desired size shouldn't be smaller than what's
281 * stored at the server now, since we just did the trunc pos
284 * We have to turn off the length dirty bit as soon as we can,
285 * so that we see updates made by other machines.
288 if (SERVERHAS64BIT(connp)) {
289 t.LowPart = outStatus.Length;
290 t.HighPart = outStatus.Length_hi;
292 t = ConvertLongToLargeInteger(outStatus.Length);
295 if (LargeIntegerGreaterThanOrEqualTo(t, scp->length))
296 scp->mask &= ~CM_SCACHEMASK_LENGTH;
298 cm_MergeStatus(scp, &outStatus, &volSync, userp, 0);
300 if (code == CM_ERROR_SPACE)
301 scp->flags |= CM_SCACHEFLAG_OUTOFSPACE;
302 else if (code == CM_ERROR_QUOTA)
303 scp->flags |= CM_SCACHEFLAG_OVERQUOTA;
305 lock_ReleaseMutex(&scp->mx);
306 cm_ReleaseBIOD(&biod, 1, code);
312 * Truncate the file, by sending a StoreData RPC with zero length.
314 * Called with scp locked. Releases and re-obtains the lock.
316 long cm_StoreMini(cm_scache_t *scp, cm_user_t *userp, cm_req_t *reqp)
318 AFSFetchStatus outStatus;
319 AFSStoreStatus inStatus;
323 osi_hyper_t truncPos;
325 struct rx_call *callp;
326 struct rx_connection *rxconnp;
327 int require_64bit_ops = 0;
329 /* Serialize StoreData RPC's; for rationale see cm_scache.c */
330 (void) cm_SyncOp(scp, NULL, userp, reqp, 0,
331 CM_SCACHESYNC_STOREDATA_EXCL);
333 /* prepare the output status for the store */
334 inStatus.Mask = AFS_SETMODTIME;
335 inStatus.ClientModTime = scp->clientModTime;
336 scp->mask &= ~CM_SCACHEMASK_CLIENTMODTIME;
338 /* calculate truncation position */
339 truncPos = scp->length;
340 if ((scp->mask & CM_SCACHEMASK_TRUNCPOS)
341 && LargeIntegerLessThan(scp->truncPos, truncPos))
342 truncPos = scp->truncPos;
343 scp->mask &= ~CM_SCACHEMASK_TRUNCPOS;
345 if (LargeIntegerGreaterThan(truncPos,
346 ConvertLongToLargeInteger(LONG_MAX))) {
348 require_64bit_ops = 1;
351 lock_ReleaseMutex(&scp->mx);
353 cm_AFSFidFromFid(&tfid, &scp->fid);
355 /* now we're ready to do the store operation */
357 code = cm_Conn(&scp->fid, userp, reqp, &connp);
362 rxconnp = cm_GetRxConn(connp);
363 callp = rx_NewCall(rxconnp);
364 rx_PutConnection(rxconnp);
366 #ifdef AFS_LARGEFILES
367 if (SERVERHAS64BIT(connp)) {
368 code = StartRXAFS_StoreData64(callp, &tfid, &inStatus,
369 0, 0, truncPos.QuadPart);
371 if (require_64bit_ops) {
372 code = CM_ERROR_TOOBIG;
374 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
375 0, 0, truncPos.LowPart);
379 code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
380 0, 0, truncPos.LowPart);
384 if (SERVERHAS64BIT(connp))
385 code = EndRXAFS_StoreData64(callp, &outStatus, &volSync);
387 code = EndRXAFS_StoreData(callp, &outStatus, &volSync);
389 code = rx_EndCall(callp, code);
391 #ifdef AFS_LARGEFILES
392 if (code == RXGEN_OPCODE && SERVERHAS64BIT(connp)) {
393 SET_SERVERHASNO64BIT(connp);
398 } while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
399 code = cm_MapRPCError(code, reqp);
401 /* now, clean up our state */
402 lock_ObtainMutex(&scp->mx);
404 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
409 * For explanation of handling of CM_SCACHEMASK_LENGTH,
412 if (SERVERHAS64BIT(connp)) {
413 t.HighPart = outStatus.Length_hi;
414 t.LowPart = outStatus.Length;
416 t = ConvertLongToLargeInteger(outStatus.Length);
419 if (LargeIntegerGreaterThanOrEqualTo(t, scp->length))
420 scp->mask &= ~CM_SCACHEMASK_LENGTH;
421 cm_MergeStatus(scp, &outStatus, &volSync, userp, 0);
427 long cm_BufRead(cm_buf_t *bufp, long nbytes, long *bytesReadp, cm_user_t *userp)
429 *bytesReadp = cm_data.buf_blockSize;
431 /* now return a code that means that I/O is done */
435 /* stabilize scache entry, and return with it locked so
438 long cm_BufStabilize(void *vscp, cm_user_t *userp, cm_req_t *reqp)
440 cm_scache_t *scp = vscp;
443 lock_ObtainMutex(&scp->mx);
444 code = cm_SyncOp(scp, NULL, userp, reqp, 0,
445 CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_SETSIZE);
447 lock_ReleaseMutex(&scp->mx);
454 /* undoes the work that cm_BufStabilize does: releases lock so things can change again */
455 long cm_BufUnstabilize(void *vscp, cm_user_t *userp)
457 cm_scache_t *scp = vscp;
459 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_SETSIZE);
461 lock_ReleaseMutex(&scp->mx);
463 /* always succeeds */
467 cm_buf_ops_t cm_bufOps = {
474 long cm_ValidateDCache(void)
476 return buf_ValidateBuffers();
479 long cm_ShutdownDCache(void)
484 int cm_InitDCache(int newFile, long chunkSize, afs_uint64 nbuffers)
486 lock_InitializeMutex(&cm_bufGetMutex, "buf_Get mutex");
487 return buf_Init(newFile, &cm_bufOps, nbuffers);
490 /* check to see if we have an up-to-date buffer. The buffer must have
491 * previously been obtained by calling buf_Get.
493 * Make sure we have a callback, and that the dataversion matches.
495 * Scp must be locked.
497 * Bufp *may* be locked.
499 int cm_HaveBuffer(cm_scache_t *scp, cm_buf_t *bufp, int isBufLocked)
502 if (!cm_HaveCallback(scp))
504 if ((bufp->cmFlags & (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED)) == (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED))
506 if (bufp->dataVersion == scp->dataVersion)
509 code = lock_TryMutex(&bufp->mx);
511 /* don't have the lock, and can't lock it, then
518 /* remember dirty flag for later */
519 code = bufp->flags & CM_BUF_DIRTY;
521 /* release lock if we obtained it here */
523 lock_ReleaseMutex(&bufp->mx);
525 /* if buffer was dirty, buffer is acceptable for use */
532 /* used when deciding whether to do a prefetch or not */
533 long cm_CheckFetchRange(cm_scache_t *scp, osi_hyper_t *startBasep, long length,
534 cm_user_t *up, cm_req_t *reqp, osi_hyper_t *realBasep)
542 /* now scan all buffers in the range, looking for any that look like
547 lock_ObtainMutex(&scp->mx);
549 /* get callback so we can do a meaningful dataVersion comparison */
550 code = cm_SyncOp(scp, NULL, up, reqp, 0,
551 CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
553 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
554 lock_ReleaseMutex(&scp->mx);
558 if (LargeIntegerGreaterThanOrEqualTo(tbase, scp->length)) {
559 /* we're past the end of file */
563 bp = buf_Find(scp, &tbase);
564 /* We cheat slightly by not locking the bp mutex. */
566 if ((bp->cmFlags & (CM_BUF_CMFETCHING | CM_BUF_CMSTORING)) == 0
567 && bp->dataVersion != scp->dataVersion)
575 /* if this buffer is essentially guaranteed to require a fetch,
576 * break out here and return this position.
581 toffset.LowPart = cm_data.buf_blockSize;
582 toffset.HighPart = 0;
583 tbase = LargeIntegerAdd(toffset, tbase);
584 length -= cm_data.buf_blockSize;
587 /* if we get here, either everything is fine or stop stopped us at a
588 * particular buffer in the range that definitely needs to be fetched.
591 /* return non-zero code since realBasep won't be valid */
592 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
596 /* successfully found a page that will need fetching */
600 lock_ReleaseMutex(&scp->mx);
605 cm_BkgStore(cm_scache_t *scp, afs_uint32 p1, afs_uint32 p2, afs_uint32 p3, afs_uint32 p4,
613 if (scp->flags & CM_SCACHEFLAG_DELETED) {
614 osi_Log4(afsd_logp, "Skipping BKG store - Deleted scp 0x%p, offset 0x%x:%08x, length 0x%x", scp, p2, p1, p3);
618 /* Retries will be performed by the BkgDaemon thread if appropriate */
619 req.flags |= CM_REQ_NORETRY;
621 toffset.LowPart = p1;
622 toffset.HighPart = p2;
625 osi_Log4(afsd_logp, "Starting BKG store scp 0x%p, offset 0x%x:%08x, length 0x%x", scp, p2, p1, p3);
627 code = cm_BufWrite(scp, &toffset, length, /* flags */ 0, userp, &req);
629 osi_Log4(afsd_logp, "Finished BKG store scp 0x%p, offset 0x%x:%08x, code 0x%x", scp, p2, p1, code);
632 lock_ObtainMutex(&scp->mx);
633 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_ASYNCSTORE);
634 lock_ReleaseMutex(&scp->mx);
639 /* Called with scp locked */
640 void cm_ClearPrefetchFlag(long code, cm_scache_t *scp, osi_hyper_t *base)
645 thyper.LowPart = cm_chunkSize;
647 thyper = LargeIntegerAdd(*base, thyper);
648 thyper.LowPart &= (-cm_chunkSize);
649 if (LargeIntegerGreaterThan(*base, scp->prefetch.base))
650 scp->prefetch.base = *base;
651 if (LargeIntegerGreaterThan(thyper, scp->prefetch.end))
652 scp->prefetch.end = thyper;
654 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
657 /* do the prefetch. if the prefetch fails, return 0 (success)
658 * because there is no harm done. */
660 cm_BkgPrefetch(cm_scache_t *scp, afs_uint32 p1, afs_uint32 p2, afs_uint32 p3, afs_uint32 p4,
667 int cpff = 0; /* cleared prefetch flag */
672 /* Retries will be performed by the BkgDaemon thread if appropriate */
673 req.flags |= CM_REQ_NORETRY;
679 osi_Log2(afsd_logp, "Starting BKG prefetch scp 0x%p, base 0x%x", scp, p1);
681 code = buf_Get(scp, &base, &bp);
683 lock_ObtainMutex(&scp->mx);
685 if (code || (bp->cmFlags & CM_BUF_CMFETCHING)) {
686 scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
687 lock_ReleaseMutex(&scp->mx);
693 code = cm_GetBuffer(scp, bp, &cpff, userp, &req);
695 cm_ClearPrefetchFlag(code, scp, &base);
696 lock_ReleaseMutex(&scp->mx);
701 /* a read was issued to offsetp, and we have to determine whether we should
704 void cm_ConsiderPrefetch(cm_scache_t *scp, osi_hyper_t *offsetp,
705 cm_user_t *userp, cm_req_t *reqp)
708 osi_hyper_t realBase;
709 osi_hyper_t readBase;
712 /* round up to chunk boundary */
713 readBase.LowPart += (cm_chunkSize-1);
714 readBase.LowPart &= (-cm_chunkSize);
716 lock_ObtainMutex(&scp->mx);
717 if ((scp->flags & CM_SCACHEFLAG_PREFETCHING)
718 || LargeIntegerLessThanOrEqualTo(readBase, scp->prefetch.base)) {
719 lock_ReleaseMutex(&scp->mx);
722 scp->flags |= CM_SCACHEFLAG_PREFETCHING;
724 /* start the scan at the latter of the end of this read or
725 * the end of the last fetched region.
727 if (LargeIntegerGreaterThan(scp->prefetch.end, readBase))
728 readBase = scp->prefetch.end;
730 lock_ReleaseMutex(&scp->mx);
732 code = cm_CheckFetchRange(scp, &readBase, cm_chunkSize, userp, reqp,
735 return; /* can't find something to prefetch */
737 osi_Log2(afsd_logp, "BKG Prefetch request scp 0x%p, base 0x%x",
738 scp, realBase.LowPart);
740 cm_QueueBKGRequest(scp, cm_BkgPrefetch, realBase.LowPart,
741 realBase.HighPart, cm_chunkSize, 0, userp);
744 /* scp must be locked; temporarily unlocked during processing.
745 * If returns 0, returns buffers held in biop, and with
746 * CM_BUF_CMSTORING set.
748 * Caller *must* set CM_BUF_WRITING and reset the over.hEvent field if the
749 * buffer is ever unlocked before CM_BUF_DIRTY is cleared. And if
750 * CM_BUF_WRITING is ever viewed by anyone, then it must be cleared, sleepers
751 * must be woken, and the event must be set when the I/O is done. All of this
752 * is required so that buf_WaitIO synchronizes properly with the buffer as it
753 * is being written out.
755 long cm_SetupStoreBIOD(cm_scache_t *scp, osi_hyper_t *inOffsetp, long inSize,
756 cm_bulkIO_t *biop, cm_user_t *userp, cm_req_t *reqp)
759 osi_queueData_t *qdp;
762 osi_hyper_t scanStart; /* where to start scan for dirty pages */
763 osi_hyper_t scanEnd; /* where to stop scan for dirty pages */
764 osi_hyper_t firstModOffset; /* offset of first modified page in range */
767 long flags; /* flags to cm_SyncOp */
769 /* clear things out */
770 biop->scp = scp; /* do not hold; held by caller */
771 biop->offset = *inOffsetp;
773 biop->bufListp = NULL;
774 biop->bufListEndp = NULL;
777 /* reserve a chunk's worth of buffers */
778 lock_ReleaseMutex(&scp->mx);
779 buf_ReserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
780 lock_ObtainMutex(&scp->mx);
783 for (temp = 0; temp < inSize; temp += cm_data.buf_blockSize) {
785 thyper.LowPart = temp;
786 tbase = LargeIntegerAdd(*inOffsetp, thyper);
788 bufp = buf_Find(scp, &tbase);
790 /* get buffer mutex and scp mutex safely */
791 lock_ReleaseMutex(&scp->mx);
792 lock_ObtainMutex(&bufp->mx);
793 lock_ObtainMutex(&scp->mx);
795 flags = CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_STOREDATA | CM_SCACHESYNC_BUFLOCKED;
796 code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
798 lock_ReleaseMutex(&bufp->mx);
800 buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
804 /* if the buffer is dirty, we're done */
805 if (bufp->flags & CM_BUF_DIRTY) {
806 osi_assertx(!(bufp->flags & CM_BUF_WRITING),
807 "WRITING w/o CMSTORING in SetupStoreBIOD");
808 bufp->flags |= CM_BUF_WRITING;
812 /* this buffer is clean, so there's no reason to process it */
813 cm_SyncOpDone(scp, bufp, flags);
814 lock_ReleaseMutex(&bufp->mx);
822 /* if we get here, if bufp is null, we didn't find any dirty buffers
823 * that weren't already being stored back, so we just quit now.
829 /* don't need buffer mutex any more */
830 lock_ReleaseMutex(&bufp->mx);
832 /* put this element in the list */
834 osi_SetQData(qdp, bufp);
835 /* don't have to hold bufp, since held by buf_Find above */
836 osi_QAddH((osi_queue_t **) &biop->bufListp,
837 (osi_queue_t **) &biop->bufListEndp,
839 biop->length = cm_data.buf_blockSize;
840 firstModOffset = bufp->offset;
841 biop->offset = firstModOffset;
842 bufp = NULL; /* this buffer and reference added to the queue */
844 /* compute the window surrounding *inOffsetp of size cm_chunkSize */
845 scanStart = *inOffsetp;
846 scanStart.LowPart &= (-cm_chunkSize);
847 thyper.LowPart = cm_chunkSize;
849 scanEnd = LargeIntegerAdd(scanStart, thyper);
851 flags = CM_SCACHESYNC_GETSTATUS
852 | CM_SCACHESYNC_STOREDATA
853 | CM_SCACHESYNC_BUFLOCKED
854 | CM_SCACHESYNC_NOWAIT;
856 /* start by looking backwards until scanStart */
857 thyper.HighPart = 0; /* hyper version of cm_data.buf_blockSize */
858 thyper.LowPart = cm_data.buf_blockSize;
859 tbase = LargeIntegerSubtract(firstModOffset, thyper);
860 while(LargeIntegerGreaterThanOrEqualTo(tbase, scanStart)) {
861 /* see if we can find the buffer */
862 bufp = buf_Find(scp, &tbase);
866 /* try to lock it, and quit if we can't (simplifies locking) */
867 lock_ReleaseMutex(&scp->mx);
868 code = lock_TryMutex(&bufp->mx);
869 lock_ObtainMutex(&scp->mx);
876 code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
878 lock_ReleaseMutex(&bufp->mx);
884 if (!(bufp->flags & CM_BUF_DIRTY)) {
885 /* buffer is clean, so we shouldn't add it */
886 cm_SyncOpDone(scp, bufp, flags);
887 lock_ReleaseMutex(&bufp->mx);
893 /* don't need buffer mutex any more */
894 lock_ReleaseMutex(&bufp->mx);
896 /* we have a dirty buffer ready for storing. Add it to the tail
897 * of the list, since it immediately precedes all of the disk
898 * addresses we've already collected.
901 osi_SetQData(qdp, bufp);
902 /* no buf_hold necessary, since we have it held from buf_Find */
903 osi_QAddT((osi_queue_t **) &biop->bufListp,
904 (osi_queue_t **) &biop->bufListEndp,
906 bufp = NULL; /* added to the queue */
908 /* update biod info describing the transfer */
909 biop->offset = LargeIntegerSubtract(biop->offset, thyper);
910 biop->length += cm_data.buf_blockSize;
912 /* update loop pointer */
913 tbase = LargeIntegerSubtract(tbase, thyper);
914 } /* while loop looking for pages preceding the one we found */
916 /* now, find later dirty, contiguous pages, and add them to the list */
917 thyper.HighPart = 0; /* hyper version of cm_data.buf_blockSize */
918 thyper.LowPart = cm_data.buf_blockSize;
919 tbase = LargeIntegerAdd(firstModOffset, thyper);
920 while(LargeIntegerLessThan(tbase, scanEnd)) {
921 /* see if we can find the buffer */
922 bufp = buf_Find(scp, &tbase);
926 /* try to lock it, and quit if we can't (simplifies locking) */
927 lock_ReleaseMutex(&scp->mx);
928 code = lock_TryMutex(&bufp->mx);
929 lock_ObtainMutex(&scp->mx);
936 code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
938 lock_ReleaseMutex(&bufp->mx);
944 if (!(bufp->flags & CM_BUF_DIRTY)) {
945 /* buffer is clean, so we shouldn't add it */
946 cm_SyncOpDone(scp, bufp, flags);
947 lock_ReleaseMutex(&bufp->mx);
953 /* don't need buffer mutex any more */
954 lock_ReleaseMutex(&bufp->mx);
956 /* we have a dirty buffer ready for storing. Add it to the head
957 * of the list, since it immediately follows all of the disk
958 * addresses we've already collected.
961 osi_SetQData(qdp, bufp);
962 /* no buf_hold necessary, since we have it held from buf_Find */
963 osi_QAddH((osi_queue_t **) &biop->bufListp,
964 (osi_queue_t **) &biop->bufListEndp,
968 /* update biod info describing the transfer */
969 biop->length += cm_data.buf_blockSize;
971 /* update loop pointer */
972 tbase = LargeIntegerAdd(tbase, thyper);
973 } /* while loop looking for pages following the first page we found */
975 /* finally, we're done */
979 /* scp must be locked; temporarily unlocked during processing.
980 * If returns 0, returns buffers held in biop, and with
981 * CM_BUF_CMFETCHING flags set.
982 * If an error is returned, we don't return any buffers.
984 long cm_SetupFetchBIOD(cm_scache_t *scp, osi_hyper_t *offsetp,
985 cm_bulkIO_t *biop, cm_user_t *up, cm_req_t *reqp)
989 osi_hyper_t toffset; /* a long long temp variable */
990 osi_hyper_t pageBase; /* base offset we're looking at */
991 osi_queueData_t *qdp; /* one temp queue structure */
992 osi_queueData_t *tqdp; /* another temp queue structure */
993 long collected; /* how many bytes have been collected */
996 osi_hyper_t fileSize; /* the # of bytes in the file */
997 osi_queueData_t *heldBufListp; /* we hold all buffers in this list */
998 osi_queueData_t *heldBufListEndp; /* first one */
1001 biop->scp = scp; /* do not hold; held by caller */
1002 biop->offset = *offsetp;
1003 /* null out the list of buffers */
1004 biop->bufListp = biop->bufListEndp = NULL;
1007 /* first lookup the file's length, so we know when to stop */
1008 code = cm_SyncOp(scp, NULL, up, reqp, 0,
1009 CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
1013 /* copy out size, since it may change */
1014 fileSize = scp->serverLength;
1016 lock_ReleaseMutex(&scp->mx);
1018 pageBase = *offsetp;
1019 collected = pageBase.LowPart & (cm_chunkSize - 1);
1020 heldBufListp = NULL;
1021 heldBufListEndp = NULL;
1024 * Obtaining buffers can cause dirty buffers to be recycled, which
1025 * can cause a storeback, so cannot be done while we have buffers
1028 * To get around this, we get buffers twice. Before reserving buffers,
1029 * we obtain and release each one individually. After reserving
1030 * buffers, we try to obtain them again, but only by lookup, not by
1031 * recycling. If a buffer has gone away while we were waiting for
1032 * the others, we just use whatever buffers we already have.
1034 * On entry to this function, we are already holding a buffer, so we
1035 * can't wait for reservation. So we call buf_TryReserveBuffers()
1036 * instead. Not only that, we can't really even call buf_Get(), for
1037 * the same reason. We can't avoid that, though. To avoid deadlock
1038 * we allow only one thread to be executing the buf_Get()-buf_Release()
1039 * sequence at a time.
1042 // lock_ObtainMutex(&cm_bufGetMutex);
1043 /* first hold all buffers, since we can't hold any locks in buf_Get */
1045 /* stop at chunk boundary */
1046 if (collected >= cm_chunkSize)
1049 /* see if the next page would be past EOF */
1050 if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
1053 code = buf_Get(scp, &pageBase, &tbp);
1055 //lock_ReleaseMutex(&cm_bufGetMutex);
1056 lock_ObtainMutex(&scp->mx);
1057 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
1063 toffset.HighPart = 0;
1064 toffset.LowPart = cm_data.buf_blockSize;
1065 pageBase = LargeIntegerAdd(toffset, pageBase);
1066 collected += cm_data.buf_blockSize;
1069 /* reserve a chunk's worth of buffers if possible */
1070 reserving = buf_TryReserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
1072 // lock_ReleaseMutex(&cm_bufGetMutex);
1074 pageBase = *offsetp;
1075 collected = pageBase.LowPart & (cm_chunkSize - 1);
1077 /* now hold all buffers, if they are still there */
1079 /* stop at chunk boundary */
1080 if (collected >= cm_chunkSize)
1083 /* see if the next page would be past EOF */
1084 if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
1087 tbp = buf_Find(scp, &pageBase);
1091 /* add the buffer to the list */
1092 qdp = osi_QDAlloc();
1093 osi_SetQData(qdp, tbp);
1094 osi_QAddH((osi_queue_t **)&heldBufListp,
1095 (osi_queue_t **)&heldBufListEndp,
1097 /* leave tbp held (from buf_Get) */
1102 collected += cm_data.buf_blockSize;
1103 toffset.HighPart = 0;
1104 toffset.LowPart = cm_data.buf_blockSize;
1105 pageBase = LargeIntegerAdd(toffset, pageBase);
1108 /* look at each buffer, adding it into the list if it looks idle and
1109 * filled with old data. One special case: wait for idle if it is the
1110 * first buffer since we really need that one for our caller to make
1114 collected = 0; /* now count how many we'll really use */
1115 for (tqdp = heldBufListEndp;
1117 tqdp = (osi_queueData_t *) osi_QPrev(&tqdp->q)) {
1118 /* get a ptr to the held buffer */
1119 tbp = osi_GetQData(tqdp);
1120 pageBase = tbp->offset;
1122 /* now lock the buffer lock */
1123 lock_ObtainMutex(&tbp->mx);
1124 lock_ObtainMutex(&scp->mx);
1126 /* don't bother fetching over data that is already current */
1127 if (tbp->dataVersion == scp->dataVersion) {
1128 /* we don't need this buffer, since it is current */
1129 lock_ReleaseMutex(&scp->mx);
1130 lock_ReleaseMutex(&tbp->mx);
1134 flags = CM_SCACHESYNC_FETCHDATA | CM_SCACHESYNC_BUFLOCKED;
1136 flags |= CM_SCACHESYNC_NOWAIT;
1138 /* wait for the buffer to serialize, if required. Doesn't
1139 * release the scp or buffer lock(s) if NOWAIT is specified.
1141 code = cm_SyncOp(scp, tbp, up, reqp, 0, flags);
1143 lock_ReleaseMutex(&scp->mx);
1144 lock_ReleaseMutex(&tbp->mx);
1148 /* don't fetch over dirty buffers */
1149 if (tbp->flags & CM_BUF_DIRTY) {
1150 cm_SyncOpDone(scp, tbp, flags);
1151 lock_ReleaseMutex(&scp->mx);
1152 lock_ReleaseMutex(&tbp->mx);
1157 lock_ReleaseMutex(&scp->mx);
1158 lock_ReleaseMutex(&tbp->mx);
1160 /* add the buffer to the list */
1161 qdp = osi_QDAlloc();
1162 osi_SetQData(qdp, tbp);
1163 osi_QAddH((osi_queue_t **)&biop->bufListp,
1164 (osi_queue_t **)&biop->bufListEndp,
1168 /* from now on, a failure just stops our collection process, but
1169 * we still do the I/O to whatever we've already managed to collect.
1172 collected += cm_data.buf_blockSize;
1175 /* now, we've held in biop->bufListp all the buffer's we're really
1176 * interested in. We also have holds left from heldBufListp, and we
1177 * now release those holds on the buffers.
1179 for (qdp = heldBufListp; qdp; qdp = tqdp) {
1180 tqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
1181 tbp = osi_GetQData(qdp);
1182 osi_QRemoveHT((osi_queue_t **) &heldBufListp,
1183 (osi_queue_t **) &heldBufListEndp,
1189 /* Caller expects this */
1190 lock_ObtainMutex(&scp->mx);
1192 /* if we got a failure setting up the first buffer, then we don't have
1193 * any side effects yet, and we also have failed an operation that the
1194 * caller requires to make any progress. Give up now.
1196 if (code && isFirst) {
1197 buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
1201 /* otherwise, we're still OK, and should just return the I/O setup we've
1204 biop->length = collected;
1205 biop->reserved = reserving;
1209 /* release a bulk I/O structure that was setup by cm_SetupFetchBIOD or by
1212 void cm_ReleaseBIOD(cm_bulkIO_t *biop, int isStore, int failed)
1214 cm_scache_t *scp; /* do not release; not held in biop */
1216 osi_queueData_t *qdp;
1217 osi_queueData_t *nqdp;
1220 /* Give back reserved buffers */
1222 buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
1225 flags = CM_SCACHESYNC_STOREDATA;
1227 flags = CM_SCACHESYNC_FETCHDATA;
1230 if (biop->bufListp) {
1231 for(qdp = biop->bufListp; qdp; qdp = nqdp) {
1232 /* lookup next guy first, since we're going to free this one */
1233 nqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
1235 /* extract buffer and free queue data */
1236 bufp = osi_GetQData(qdp);
1237 osi_QRemoveHT((osi_queue_t **) &biop->bufListp,
1238 (osi_queue_t **) &biop->bufListEndp,
1242 /* now, mark I/O as done, unlock the buffer and release it */
1243 lock_ObtainMutex(&bufp->mx);
1244 lock_ObtainMutex(&scp->mx);
1245 cm_SyncOpDone(scp, bufp, flags);
1247 /* turn off writing and wakeup users */
1249 if (bufp->flags & CM_BUF_WAITING) {
1250 osi_Log2(afsd_logp, "cm_ReleaseBIOD Waking [scp 0x%p] bp 0x%p", scp, bufp);
1251 osi_Wakeup((LONG_PTR) bufp);
1254 bufp->flags &= ~CM_BUF_WRITING;
1256 bufp->flags &= ~(CM_BUF_WRITING | CM_BUF_DIRTY);
1259 lock_ReleaseMutex(&scp->mx);
1260 lock_ReleaseMutex(&bufp->mx);
1265 lock_ObtainMutex(&scp->mx);
1266 cm_SyncOpDone(scp, NULL, flags);
1267 lock_ReleaseMutex(&scp->mx);
1270 /* clean things out */
1271 biop->bufListp = NULL;
1272 biop->bufListEndp = NULL;
1275 /* Fetch a buffer. Called with scp locked.
1276 * The scp is locked on return.
1278 long cm_GetBuffer(cm_scache_t *scp, cm_buf_t *bufp, int *cpffp, cm_user_t *up,
1282 afs_int32 nbytes; /* bytes in transfer */
1283 afs_int32 nbytes_hi = 0; /* high-order 32 bits of bytes in transfer */
1284 afs_int64 length_found = 0;
1285 long rbytes; /* bytes in rx_Read call */
1287 AFSFetchStatus afsStatus;
1288 AFSCallBack callback;
1291 cm_buf_t *tbufp; /* buf we're filling */
1292 osi_queueData_t *qdp; /* q element we're scanning */
1294 struct rx_call *callp;
1295 struct rx_connection *rxconnp;
1296 cm_bulkIO_t biod; /* bulk IO descriptor */
1300 int require_64bit_ops = 0;
1302 /* now, the buffer may or may not be filled with good data (buf_GetNew
1303 * drops lots of locks, and may indeed return a properly initialized
1304 * buffer, although more likely it will just return a new, empty, buffer.
1307 #ifdef AFS_FREELANCE_CLIENT
1309 // yj: if they're trying to get the /afs directory, we need to
1310 // handle it differently, since it's local rather than on any
1313 getroot = (scp==cm_data.rootSCachep);
1315 osi_Log1(afsd_logp,"GetBuffer returns cm_data.rootSCachep=%x",cm_data.rootSCachep);
1318 cm_AFSFidFromFid(&tfid, &scp->fid);
1320 code = cm_SetupFetchBIOD(scp, &bufp->offset, &biod, up, reqp);
1322 /* couldn't even get the first page setup properly */
1323 osi_Log1(afsd_logp, "SetupFetchBIOD failure code %d", code);
1327 /* once we get here, we have the callback in place, we know that no one
1328 * is fetching the data now. Check one last time that we still have
1329 * the wrong data, and then fetch it if we're still wrong.
1331 * We can lose a race condition and end up with biod.length zero, in
1332 * which case we just retry.
1334 if (bufp->dataVersion == scp->dataVersion || biod.length == 0) {
1335 osi_Log3(afsd_logp, "Bad DVs %d, %d or length 0x%x",
1336 bufp->dataVersion, scp->dataVersion, biod.length);
1337 if ((bufp->dataVersion == -1
1338 || bufp->dataVersion < scp->dataVersion)
1339 && LargeIntegerGreaterThanOrEqualTo(bufp->offset,
1340 scp->serverLength)) {
1341 if (bufp->dataVersion == -1)
1342 memset(bufp->datap, 0, cm_data.buf_blockSize);
1343 bufp->dataVersion = scp->dataVersion;
1345 lock_ReleaseMutex(&scp->mx);
1346 cm_ReleaseBIOD(&biod, 0, 0);
1347 lock_ObtainMutex(&scp->mx);
1351 lock_ReleaseMutex(&scp->mx);
1353 if (LargeIntegerGreaterThan(LargeIntegerAdd(biod.offset,
1354 ConvertLongToLargeInteger(biod.length)),
1355 ConvertLongToLargeInteger(LONG_MAX))) {
1356 require_64bit_ops = 1;
1360 DPRINTF("cm_GetBuffer: fetching data scpDV=%d bufDV=%d scp=%x bp=%x dcp=%x\n",
1361 scp->dataVersion, bufp->dataVersion, scp, bufp, bufp->dcp);
1362 #endif /* DISKCACHE95 */
1364 #ifdef AFS_FREELANCE_CLIENT
1367 // if getroot then we don't need to make any calls
1368 // just return fake data
1370 if (cm_freelanceEnabled && getroot) {
1371 // setup the fake status
1372 afsStatus.InterfaceVersion = 0x1;
1373 afsStatus.FileType = 0x2;
1374 afsStatus.LinkCount = scp->linkCount;
1375 afsStatus.Length = cm_fakeDirSize;
1376 afsStatus.DataVersion = cm_data.fakeDirVersion;
1377 afsStatus.Author = 0x1;
1378 afsStatus.Owner = 0x0;
1379 afsStatus.CallerAccess = 0x9;
1380 afsStatus.AnonymousAccess = 0x9;
1381 afsStatus.UnixModeBits = 0x1ff;
1382 afsStatus.ParentVnode = 0x1;
1383 afsStatus.ParentUnique = 0x1;
1384 afsStatus.ResidencyMask = 0;
1385 afsStatus.ClientModTime = (afs_uint32)FakeFreelanceModTime;
1386 afsStatus.ServerModTime = (afs_uint32)FakeFreelanceModTime;
1387 afsStatus.Group = 0;
1388 afsStatus.SyncCounter = 0;
1389 afsStatus.dataVersionHigh = 0;
1390 afsStatus.lockCount = 0;
1391 afsStatus.Length_hi = 0;
1392 afsStatus.errorCode = 0;
1394 // once we're done setting up the status info,
1395 // we just fill the buffer pages with fakedata
1396 // from cm_FakeRootDir. Extra pages are set to
1399 lock_ObtainMutex(&cm_Freelance_Lock);
1400 t1 = bufp->offset.LowPart;
1401 qdp = biod.bufListEndp;
1403 tbufp = osi_GetQData(qdp);
1404 bufferp=tbufp->datap;
1405 memset(bufferp, 0, cm_data.buf_blockSize);
1406 t2 = cm_fakeDirSize - t1;
1407 if (t2>cm_data.buf_blockSize) t2=cm_data.buf_blockSize;
1409 memcpy(bufferp, cm_FakeRootDir+t1, t2);
1414 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
1417 lock_ReleaseMutex(&cm_Freelance_Lock);
1419 // once we're done, we skip over the part of the
1420 // code that does the ACTUAL fetching of data for
1423 goto fetchingcompleted;
1426 #endif /* AFS_FREELANCE_CLIENT */
1428 /* now make the call */
1430 code = cm_Conn(&scp->fid, up, reqp, &connp);
1434 rxconnp = cm_GetRxConn(connp);
1435 callp = rx_NewCall(rxconnp);
1436 rx_PutConnection(rxconnp);
1438 #ifdef AFS_LARGEFILES
1439 nbytes = nbytes_hi = 0;
1441 if (SERVERHAS64BIT(connp)) {
1442 osi_Log4(afsd_logp, "CALL FetchData64 scp 0x%p, off 0x%x:%08x, size 0x%x",
1443 scp, biod.offset.HighPart, biod.offset.LowPart, biod.length);
1445 code = StartRXAFS_FetchData64(callp, &tfid, biod.offset.QuadPart, biod.length);
1448 temp = rx_Read(callp, (char *) &nbytes_hi, sizeof(afs_int32));
1449 if (temp == sizeof(afs_int32)) {
1450 nbytes_hi = ntohl(nbytes_hi);
1453 code = callp->error;
1454 rx_EndCall(callp, code);
1460 if (code == RXGEN_OPCODE || !SERVERHAS64BIT(connp)) {
1461 if (require_64bit_ops) {
1462 osi_Log0(afsd_logp, "Skipping FetchData. Operation requires FetchData64");
1463 code = CM_ERROR_TOOBIG;
1466 rxconnp = cm_GetRxConn(connp);
1467 callp = rx_NewCall(rxconnp);
1468 rx_PutConnection(rxconnp);
1471 osi_Log3(afsd_logp, "CALL FetchData scp 0x%p, off 0x%x, size 0x%x",
1472 scp, biod.offset.LowPart, biod.length);
1474 code = StartRXAFS_FetchData(callp, &tfid, biod.offset.LowPart,
1477 SET_SERVERHASNO64BIT(connp);
1482 temp = rx_Read(callp, (char *)&nbytes, sizeof(afs_int32));
1483 if (temp == sizeof(afs_int32)) {
1484 nbytes = ntohl(nbytes);
1485 FillInt64(length_found, nbytes_hi, nbytes);
1486 if (length_found > biod.length)
1487 code = (callp->error < 0) ? callp->error : -1;
1489 code = (callp->error < 0) ? callp->error : -1;
1492 /* for the moment, nbytes_hi will always be 0 if code == 0
1493 because biod.length is a 32-bit quantity. */
1495 osi_Log3(afsd_logp, "CALL FetchData scp 0x%p, off 0x%x, size 0x%x",
1496 scp, biod.offset.LowPart, biod.length);
1498 code = StartRXAFS_FetchData(callp, &tfid, biod.offset.LowPart,
1501 /* now copy the data out of the pipe and put it in the buffer */
1503 temp = rx_Read(callp, (char *)&nbytes, sizeof(afs_int32));
1504 if (temp == sizeof(afs_int32)) {
1505 nbytes = ntohl(nbytes);
1506 if (nbytes > biod.length)
1507 code = (callp->error < 0) ? callp->error : -1;
1510 code = (callp->error < 0) ? callp->error : -1;
1515 qdp = biod.bufListEndp;
1517 tbufp = osi_GetQData(qdp);
1518 bufferp = tbufp->datap;
1522 /* fill nbytes of data from the pipe into the pages.
1523 * When we stop, qdp will point at the last page we're
1524 * dealing with, and bufferp will tell us where we
1525 * stopped. We'll need this info below when we clear
1526 * the remainder of the last page out (and potentially
1527 * clear later pages out, if we fetch past EOF).
1529 while (nbytes > 0) {
1530 /* assert that there are still more buffers;
1531 * our check above for nbytes being less than
1532 * biod.length should ensure this.
1534 osi_assert(bufferp != NULL);
1536 /* read rbytes of data */
1537 rbytes = (nbytes > cm_data.buf_blockSize? cm_data.buf_blockSize : nbytes);
1538 temp = rx_Read(callp, bufferp, rbytes);
1539 if (temp < rbytes) {
1540 code = (callp->error < 0) ? callp->error : -1;
1544 /* allow read-while-fetching.
1545 * if this is the last buffer, clear the
1546 * PREFETCHING flag, so the reader waiting for
1547 * this buffer will start a prefetch.
1549 tbufp->cmFlags |= CM_BUF_CMFULLYFETCHED;
1550 lock_ObtainMutex(&scp->mx);
1551 if (scp->flags & CM_SCACHEFLAG_WAITING) {
1552 osi_Log1(afsd_logp, "CM GetBuffer Waking scp 0x%p", scp);
1553 osi_Wakeup((LONG_PTR) &scp->flags);
1555 if (cpffp && !*cpffp && !osi_QPrev(&qdp->q)) {
1557 cm_ClearPrefetchFlag(0, scp, &biod.offset);
1559 lock_ReleaseMutex(&scp->mx);
1561 /* and adjust counters */
1564 /* and move to the next buffer */
1566 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
1568 tbufp = osi_GetQData(qdp);
1569 bufferp = tbufp->datap;
1577 /* zero out remainder of last pages, in case we are
1578 * fetching past EOF. We were fetching an integral #
1579 * of pages, but stopped, potentially in the middle of
1580 * a page. Zero the remainder of that page, and then
1581 * all of the rest of the pages.
1584 osi_assert((bufferp - tbufp->datap) < LONG_MAX);
1585 rbytes = (long) (bufferp - tbufp->datap);
1587 /* bytes left to zero */
1588 rbytes = cm_data.buf_blockSize - rbytes;
1591 memset(bufferp, 0, rbytes);
1592 qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
1595 tbufp = osi_GetQData(qdp);
1596 bufferp = tbufp->datap;
1597 /* bytes to clear in this page */
1598 rbytes = cm_data.buf_blockSize;
1603 if (SERVERHAS64BIT(connp))
1604 code = EndRXAFS_FetchData64(callp, &afsStatus, &callback, &volSync);
1606 code = EndRXAFS_FetchData(callp, &afsStatus, &callback, &volSync);
1608 if (SERVERHAS64BIT(connp))
1609 osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData64 skipped due to error %d", code);
1611 osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData skipped due to error %d", code);
1615 code = rx_EndCall(callp, code);
1617 if (code == RXKADUNKNOWNKEY)
1618 osi_Log0(afsd_logp, "CALL EndCall returns RXKADUNKNOWNKEY");
1620 osi_Log0(afsd_logp, "CALL FetchData DONE");
1622 } while (cm_Analyze(connp, up, reqp, &scp->fid, &volSync, NULL, NULL, code));
1625 code = cm_MapRPCError(code, reqp);
1627 lock_ObtainMutex(&scp->mx);
1629 cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_FETCHSTATUS);
1631 /* we know that no one else has changed the buffer, since we still have
1632 * the fetching flag on the buffers, and we have the scp locked again.
1633 * Copy in the version # into the buffer if we got code 0 back from the
1637 for(qdp = biod.bufListp;
1639 qdp = (osi_queueData_t *) osi_QNext(&qdp->q)) {
1640 tbufp = osi_GetQData(qdp);
1641 tbufp->dataVersion = afsStatus.DataVersion;
1644 /* write buffer out to disk cache */
1645 diskcache_Update(tbufp->dcp, tbufp->datap, cm_data.buf_blockSize,
1646 tbufp->dataVersion);
1647 #endif /* DISKCACHE95 */
1651 /* release scatter/gather I/O structure (buffers, locks) */
1652 lock_ReleaseMutex(&scp->mx);
1653 cm_ReleaseBIOD(&biod, 0, code);
1654 lock_ObtainMutex(&scp->mx);
1657 cm_MergeStatus(scp, &afsStatus, &volSync, up, 0);