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
17 #include <afsconfig.h>
18 #include "afs/param.h"
23 #include "afs/sysincludes.h" /* Standard vendor system headers */
24 #include "afsincludes.h" /* Afs-based standard headers */
25 #include "afs/afs_stats.h" /* statistics */
26 #include "afs/afs_cbqueue.h"
27 #include "afs/nfsclient.h"
28 #include "afs/exporter.h"
29 #include "afs/afs_osidnlc.h"
32 extern struct DirEntry *afs_dir_GetBlob();
34 #ifdef AFS_LINUX22_ENV
35 extern struct inode_operations afs_symlink_iops, afs_dir_iops;
39 afs_int32 afs_bkvolpref = 0;
40 afs_int32 afs_bulkStatsDone;
41 static int bulkStatCounter = 0; /* counter for bulk stat seq. numbers */
42 int afs_fakestat_enable = 0; /* 1: fakestat-all, 2: fakestat-crosscell */
45 /* this would be faster if it did comparison as int32word, but would be
46 * dependant on byte-order and alignment, and I haven't figured out
47 * what "@sys" is in binary... */
48 #define AFS_EQ_ATSYS(name) (((name)[0]=='@')&&((name)[1]=='s')&&((name)[2]=='y')&&((name)[3]=='s')&&(!(name)[4]))
50 /* call under write lock, evaluate mvid field from a mt pt.
51 * avc is the vnode of the mount point object; must be write-locked.
52 * advc is the vnode of the containing directory (optional; if NULL and
53 * EvalMountPoint succeeds, caller must initialize *avolpp->dotdot)
54 * avolpp is where we return a pointer to the volume named by the mount pt, if success
55 * areq is the identity of the caller.
57 * NOTE: this function returns a held volume structure in *volpp if it returns 0!
60 EvalMountPoint(register struct vcache *avc, struct vcache *advc,
61 struct volume **avolpp, register struct vrequest *areq)
64 struct volume *tvp = 0;
67 char *cpos, *volnamep;
69 afs_int32 prefetch; /* 1=>None 2=>RO 3=>BK */
70 afs_int32 mtptCell, assocCell, hac = 0;
71 afs_int32 samecell, roname, len;
73 AFS_STATCNT(EvalMountPoint);
75 if (avc->mvid && (avc->states & CMValid))
76 return 0; /* done while racing */
79 code = afs_HandleLink(avc, areq);
83 /* Determine which cell and volume the mointpoint goes to */
84 type = avc->linkData[0]; /* '#'=>Regular '%'=>RW */
85 cpos = afs_strchr(&avc->linkData[1], ':'); /* if cell name present */
89 tcell = afs_GetCellByName(&avc->linkData[1], READ_LOCK);
92 volnamep = &avc->linkData[1];
93 tcell = afs_GetCell(avc->fid.Cell, READ_LOCK);
98 mtptCell = tcell->cellNum; /* The cell for the mountpoint */
100 hac = 1; /* has associated cell */
101 assocCell = tcell->lcellp->cellNum; /* The associated cell */
103 afs_PutCell(tcell, READ_LOCK);
105 /* Is volume name a "<n>.backup" or "<n>.readonly" name */
106 len = strlen(volnamep);
107 roname = ((len > 9) && (strcmp(&volnamep[len - 9], ".readonly") == 0))
108 || ((len > 7) && (strcmp(&volnamep[len - 7], ".backup") == 0));
110 /* When we cross mountpoint, do we stay in the same cell */
111 samecell = (avc->fid.Cell == mtptCell) || (hac
115 /* Decide whether to prefetch the BK, or RO. Also means we want the BK or
117 * If this is a regular mountpoint with a RW volume name
118 * - If BK preference is enabled AND we remain within the same cell AND
119 * start from a BK volume, then we will want to prefetch the BK volume.
120 * - If we cross a cell boundary OR start from a RO volume, then we will
121 * want to prefetch the RO volume.
123 if ((type == '#') && !roname) {
124 if (afs_bkvolpref && samecell && (avc->states & CBackup))
125 prefetch = 3; /* Prefetch the BK */
126 else if (!samecell || (avc->states & CRO))
127 prefetch = 2; /* Prefetch the RO */
129 prefetch = 1; /* Do not prefetch */
131 prefetch = 1; /* Do not prefetch */
134 /* Get the volume struct. Unless this volume name has ".readonly" or
135 * ".backup" in it, this will get the volume struct for the RW volume.
136 * The RO volume will be prefetched if requested (but not returned).
138 tvp = afs_GetVolumeByName(volnamep, mtptCell, prefetch, areq, WRITE_LOCK);
140 /* If no volume was found in this cell, try the associated linked cell */
141 if (!tvp && hac && areq->volumeError) {
143 afs_GetVolumeByName(volnamep, assocCell, prefetch, areq,
147 /* Still not found. If we are looking for the RO, then perhaps the RW
148 * doesn't exist? Try adding ".readonly" to volname and look for that.
149 * Don't know why we do this. Would have still found it in above call - jpm.
151 if (!tvp && (prefetch == 2) && len < AFS_SMALLOCSIZ - 10) {
152 buf = (char *)osi_AllocSmallSpace(len + 10);
154 strcpy(buf, volnamep);
155 afs_strcat(buf, ".readonly");
157 tvp = afs_GetVolumeByName(buf, mtptCell, 1, areq, WRITE_LOCK);
159 /* Try the associated linked cell if failed */
160 if (!tvp && hac && areq->volumeError) {
161 tvp = afs_GetVolumeByName(buf, assocCell, 1, areq, WRITE_LOCK);
163 osi_FreeSmallSpace(buf);
167 return ENODEV; /* Couldn't find the volume */
169 /* Don't cross mountpoint from a BK to a BK volume */
170 if ((avc->states & CBackup) && (tvp->states & VBackup)) {
171 afs_PutVolume(tvp, WRITE_LOCK);
175 /* If we want (prefetched) the BK and it exists, then drop the RW volume
177 * Otherwise, if we want (prefetched0 the RO and it exists, then drop the
178 * RW volume and get the RO.
179 * Otherwise, go with the RW.
181 if ((prefetch == 3) && tvp->backVol) {
182 tfid.Fid.Volume = tvp->backVol; /* remember BK volume */
183 tfid.Cell = tvp->cell;
184 afs_PutVolume(tvp, WRITE_LOCK); /* release old volume */
185 tvp = afs_GetVolume(&tfid, areq, WRITE_LOCK); /* get the new one */
187 return ENODEV; /* oops, can't do it */
188 } else if ((prefetch >= 2) && tvp->roVol) {
189 tfid.Fid.Volume = tvp->roVol; /* remember RO volume */
190 tfid.Cell = tvp->cell;
191 afs_PutVolume(tvp, WRITE_LOCK); /* release old volume */
192 tvp = afs_GetVolume(&tfid, areq, WRITE_LOCK); /* get the new one */
194 return ENODEV; /* oops, can't do it */
199 (struct VenusFid *)osi_AllocSmallSpace(sizeof(struct VenusFid));
200 avc->mvid->Cell = tvp->cell;
201 avc->mvid->Fid.Volume = tvp->volume;
202 avc->mvid->Fid.Vnode = 1;
203 avc->mvid->Fid.Unique = 1;
204 avc->states |= CMValid;
206 /* Used to: if the mount point is stored within a backup volume,
207 * then we should only update the parent pointer information if
208 * there's none already set, so as to avoid updating a volume's ..
209 * info with something in an OldFiles directory.
211 * Next two lines used to be under this if:
213 * if (!(avc->states & CBackup) || tvp->dotdot.Fid.Volume == 0)
215 * Now: update mount point back pointer on every call, so that we handle
216 * multiple mount points better. This way, when du tries to go back
217 * via chddir(".."), it will end up exactly where it started, yet
218 * cd'ing via a new path to a volume will reset the ".." pointer
221 tvp->mtpoint = avc->fid; /* setup back pointer to mtpoint */
223 tvp->dotdot = advc->fid;
232 * Must be called on an afs_fakestat_state object before calling
233 * afs_EvalFakeStat or afs_PutFakeStat. Calling afs_PutFakeStat
234 * without calling afs_EvalFakeStat is legal, as long as this
235 * function is called.
238 afs_InitFakeStat(struct afs_fakestat_state *state)
240 if (!afs_fakestat_enable)
245 state->need_release = 0;
249 * afs_EvalFakeStat_int
251 * The actual implementation of afs_EvalFakeStat and afs_TryEvalFakeStat,
252 * which is called by those wrapper functions.
254 * Only issues RPCs if canblock is non-zero.
257 afs_EvalFakeStat_int(struct vcache **avcp, struct afs_fakestat_state *state,
258 struct vrequest *areq, int canblock)
260 struct vcache *tvc, *root_vp;
261 struct volume *tvolp = NULL;
264 if (!afs_fakestat_enable)
267 osi_Assert(state->valid == 1);
268 osi_Assert(state->did_eval == 0);
272 if (tvc->mvstat != 1)
275 /* Is the call to VerifyVCache really necessary? */
276 code = afs_VerifyVCache(tvc, areq);
280 ObtainWriteLock(&tvc->lock, 599);
281 code = EvalMountPoint(tvc, NULL, &tvolp, areq);
282 ReleaseWriteLock(&tvc->lock);
286 tvolp->dotdot = tvc->fid;
287 tvolp->dotdot.Fid.Vnode = tvc->parentVnode;
288 tvolp->dotdot.Fid.Unique = tvc->parentUnique;
291 if (tvc->mvid && (tvc->states & CMValid)) {
297 ObtainWriteLock(&afs_xvcache, 597);
298 root_vp = afs_FindVCache(tvc->mvid, &retry, 0);
299 if (root_vp && retry) {
300 ReleaseWriteLock(&afs_xvcache);
301 afs_PutVCache(root_vp);
303 } while (root_vp && retry);
304 ReleaseWriteLock(&afs_xvcache);
306 root_vp = afs_GetVCache(tvc->mvid, areq, NULL, NULL);
309 code = canblock ? ENOENT : 0;
313 /* Is this always kosher? Perhaps we should instead use
314 * NBObtainWriteLock to avoid potential deadlock.
316 ObtainWriteLock(&root_vp->lock, 598);
318 root_vp->mvid = osi_AllocSmallSpace(sizeof(struct VenusFid));
319 *root_vp->mvid = tvolp->dotdot;
320 ReleaseWriteLock(&root_vp->lock);
322 state->need_release = 1;
323 state->root_vp = root_vp;
327 code = canblock ? ENOENT : 0;
332 afs_PutVolume(tvolp, WRITE_LOCK);
339 * Automatically does the equivalent of EvalMountPoint for vcache entries
340 * which are mount points. Remembers enough state to properly release
341 * the volume root vcache when afs_PutFakeStat() is called.
343 * State variable must be initialized by afs_InitFakeState() beforehand.
345 * Returns 0 when everything succeeds and *avcp points to the vcache entry
346 * that should be used for the real vnode operation. Returns non-zero if
347 * something goes wrong and the error code should be returned to the user.
350 afs_EvalFakeStat(struct vcache **avcp, struct afs_fakestat_state *state,
351 struct vrequest *areq)
353 return afs_EvalFakeStat_int(avcp, state, areq, 1);
357 * afs_TryEvalFakeStat
359 * Same as afs_EvalFakeStat, but tries not to talk to remote servers
360 * and only evaluate the mount point if all the data is already in
363 * Returns 0 if everything succeeds and *avcp points to a valid
364 * vcache entry (possibly evaluated).
367 afs_TryEvalFakeStat(struct vcache **avcp, struct afs_fakestat_state *state,
368 struct vrequest *areq)
370 return afs_EvalFakeStat_int(avcp, state, areq, 0);
376 * Perform any necessary cleanup at the end of a vnode op, given that
377 * afs_InitFakeStat was previously called with this state.
380 afs_PutFakeStat(struct afs_fakestat_state *state)
382 if (!afs_fakestat_enable)
385 osi_Assert(state->valid == 1);
386 if (state->need_release)
387 afs_PutVCache(state->root_vp);
392 afs_ENameOK(register char *aname)
396 AFS_STATCNT(ENameOK);
397 tlen = strlen(aname);
398 if (tlen >= 4 && strcmp(aname + tlen - 4, "@sys") == 0)
404 afs_getsysname(register struct vrequest *areq, register struct vcache *adp,
407 register struct unixuser *au;
408 register afs_int32 error;
410 if (!afs_nfsexporter) {
411 strcpy(bufp, afs_sysname);
414 AFS_STATCNT(getsysname);
415 au = afs_GetUser(areq->uid, adp->fid.Cell, 0);
418 error = EXP_SYSNAME(au->exporter, NULL, bufp);
420 strcpy(bufp, "@sys");
423 strcpy(bufp, afs_sysname);
429 Check_AtSys(register struct vcache *avc, const char *aname,
430 struct sysname_info *state, struct vrequest *areq)
432 if (AFS_EQ_ATSYS(aname)) {
434 state->name = (char *)osi_AllocLargeSpace(AFS_SMALLOCSIZ);
436 state->index = afs_getsysname(areq, avc, state->name);
446 Next_AtSys(register struct vcache *avc, struct vrequest *areq,
447 struct sysname_info *state)
449 if (state->index == -1)
450 return 0; /* No list */
452 /* Check for the initial state of aname != "@sys" in Check_AtSys */
453 if (state->offset == -1 && state->allocked == 0) {
454 register char *tname;
455 /* Check for .*@sys */
456 for (tname = state->name; *tname; tname++)
457 /*Move to the end of the string */ ;
458 if ((tname > state->name + 4) && (AFS_EQ_ATSYS(tname - 4))) {
459 state->offset = (tname - 4) - state->name;
460 tname = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
461 strncpy(tname, state->name, state->offset);
465 afs_getsysname(areq, avc, state->name + state->offset);
468 return 0; /* .*@sys doesn't match either */
469 } else if (++(state->index) >= afs_sysnamecount
470 || !afs_sysnamelist[(int)state->index])
471 return 0; /* end of list */
472 strcpy(state->name + state->offset, afs_sysnamelist[(int)state->index]);
476 #if (defined(AFS_SGI62_ENV) || defined(AFS_SUN57_64BIT_ENV))
477 extern int BlobScan(ino64_t * afile, afs_int32 ablob);
479 #if defined(AFS_HPUX1123_ENV)
480 /* DEE should use the new afs_inode_t for all */
481 extern int BlobScan(ino_t *afile, afs_int32 ablob);
483 #if defined AFS_LINUX_64BIT_KERNEL
484 extern int BlobScan(long *afile, afs_int32 ablob);
486 extern int BlobScan(afs_int32 * afile, afs_int32 ablob);
492 /* called with an unlocked directory and directory cookie. Areqp
493 * describes who is making the call.
494 * Scans the next N (about 30, typically) directory entries, and does
495 * a bulk stat call to stat them all.
497 * Must be very careful when merging in RPC responses, since we dont
498 * want to overwrite newer info that was added by a file system mutating
499 * call that ran concurrently with our bulk stat call.
501 * We do that, as described below, by not merging in our info (always
502 * safe to skip the merge) if the status info is valid in the vcache entry.
504 * If adapt ever implements the bulk stat RPC, then this code will need to
505 * ensure that vcaches created for failed RPC's to older servers have the
508 static struct vcache *BStvc = NULL;
511 afs_DoBulkStat(struct vcache *adp, long dirCookie, struct vrequest *areqp)
513 int nentries; /* # of entries to prefetch */
514 int nskip; /* # of slots in the LRU queue to skip */
515 struct vcache *lruvcp; /* vcache ptr of our goal pos in LRU queue */
516 struct dcache *dcp; /* chunk containing the dir block */
517 char *statMemp; /* status memory block */
518 char *cbfMemp; /* callback and fid memory block */
519 afs_size_t temp; /* temp for holding chunk length, &c. */
520 struct AFSFid *fidsp; /* file IDs were collecting */
521 struct AFSCallBack *cbsp; /* call back pointers */
522 struct AFSCallBack *tcbp; /* temp callback ptr */
523 struct AFSFetchStatus *statsp; /* file status info */
524 struct AFSVolSync volSync; /* vol sync return info */
525 struct vcache *tvcp; /* temp vcp */
526 struct afs_q *tq; /* temp queue variable */
527 AFSCBFids fidParm; /* file ID parm for bulk stat */
528 AFSBulkStats statParm; /* stat info parm for bulk stat */
529 int fidIndex; /* which file were stating */
530 struct conn *tcp; /* conn for call */
531 AFSCBs cbParm; /* callback parm for bulk stat */
532 struct server *hostp = 0; /* host we got callback from */
533 long startTime; /* time we started the call,
534 * for callback expiration base
536 afs_size_t statSeqNo; /* Valued of file size to detect races */
537 int code; /* error code */
538 long newIndex; /* new index in the dir */
539 struct DirEntry *dirEntryp; /* dir entry we are examining */
541 struct VenusFid afid; /* file ID we are using now */
542 struct VenusFid tfid; /* another temp. file ID */
543 afs_int32 retry; /* handle low-level SGI MP race conditions */
544 long volStates; /* flags from vol structure */
545 struct volume *volp = 0; /* volume ptr */
546 struct VenusFid dotdot;
547 int flagIndex; /* First file with bulk fetch flag set */
548 int inlinebulk = 0; /* Did we use InlineBulk RPC or not? */
550 /* first compute some basic parameters. We dont want to prefetch more
551 * than a fraction of the cache in any given call, and we want to preserve
552 * a portion of the LRU queue in any event, so as to avoid thrashing
553 * the entire stat cache (we will at least leave some of it alone).
554 * presently dont stat more than 1/8 the cache in any one call. */
555 nentries = afs_cacheStats / 8;
557 /* dont bother prefetching more than one calls worth of info */
558 if (nentries > AFSCBMAX)
561 /* heuristic to make sure that things fit in 4K. This means that
562 * we shouldnt make it any bigger than 47 entries. I am typically
563 * going to keep it a little lower, since we don't want to load
564 * too much of the stat cache.
569 /* now, to reduce the stack size, well allocate two 4K blocks,
570 * one for fids and callbacks, and one for stat info. Well set
571 * up our pointers to the memory from there, too.
573 statMemp = osi_AllocLargeSpace(nentries * sizeof(AFSFetchStatus));
574 statsp = (struct AFSFetchStatus *)statMemp;
576 osi_AllocLargeSpace(nentries *
577 (sizeof(AFSCallBack) + sizeof(AFSFid)));
578 fidsp = (AFSFid *) cbfMemp;
579 cbsp = (AFSCallBack *) (cbfMemp + nentries * sizeof(AFSFid));
581 /* next, we must iterate over the directory, starting from the specified
582 * cookie offset (dirCookie), and counting out nentries file entries.
583 * We skip files that already have stat cache entries, since we
584 * dont want to bulk stat files that are already in the cache.
587 code = afs_VerifyVCache(adp, areqp);
591 dcp = afs_GetDCache(adp, (afs_size_t) 0, areqp, &temp, &temp, 1);
597 /* lock the directory cache entry */
598 ObtainReadLock(&adp->lock);
599 ObtainReadLock(&dcp->lock);
602 * Make sure that the data in the cache is current. There are two
603 * cases we need to worry about:
604 * 1. The cache data is being fetched by another process.
605 * 2. The cache data is no longer valid
607 while ((adp->states & CStatd)
608 && (dcp->dflags & DFFetching)
609 && hsame(adp->m.DataVersion, dcp->f.versionNo)) {
610 afs_Trace4(afs_iclSetp, CM_TRACE_DCACHEWAIT, ICL_TYPE_STRING,
611 __FILE__, ICL_TYPE_INT32, __LINE__, ICL_TYPE_POINTER, dcp,
612 ICL_TYPE_INT32, dcp->dflags);
613 ReleaseReadLock(&dcp->lock);
614 ReleaseReadLock(&adp->lock);
615 afs_osi_Sleep(&dcp->validPos);
616 ObtainReadLock(&adp->lock);
617 ObtainReadLock(&dcp->lock);
619 if (!(adp->states & CStatd)
620 || !hsame(adp->m.DataVersion, dcp->f.versionNo)) {
621 ReleaseReadLock(&dcp->lock);
622 ReleaseReadLock(&adp->lock);
627 /* Generate a sequence number so we can tell whether we should
628 * store the attributes when processing the response. This number is
629 * stored in the file size when we set the CBulkFetching bit. If the
630 * CBulkFetching is still set and this value hasn't changed, then
631 * we know we were the last to set CBulkFetching bit for this file,
632 * and it is safe to set the status information for this file.
634 statSeqNo = bulkStatCounter++;
636 /* now we have dir data in the cache, so scan the dir page */
639 while (1) { /* Should probably have some constant bound */
640 /* look for first safe entry to examine in the directory. BlobScan
641 * looks for a the 1st allocated dir after the dirCookie slot.
643 newIndex = BlobScan(&dcp->f.inode, (dirCookie >> 5));
647 /* remember the updated directory cookie */
648 dirCookie = newIndex << 5;
650 /* get a ptr to the dir entry */
652 (struct DirEntry *)afs_dir_GetBlob(&dcp->f.inode, newIndex);
656 /* dont copy more than we have room for */
657 if (fidIndex >= nentries) {
658 DRelease((struct buffer *)dirEntryp, 0);
662 /* now, if the dir entry looks good, copy it out to our list. Vnode
663 * 0 means deleted, although it should also be free were it deleted.
665 if (dirEntryp->fid.vnode != 0) {
666 /* dont copy entries we have in our cache. This check will
667 * also make us skip "." and probably "..", unless it has
668 * disappeared from the cache since we did our namei call.
670 tfid.Cell = adp->fid.Cell;
671 tfid.Fid.Volume = adp->fid.Fid.Volume;
672 tfid.Fid.Vnode = ntohl(dirEntryp->fid.vnode);
673 tfid.Fid.Unique = ntohl(dirEntryp->fid.vunique);
676 ObtainWriteLock(&afs_xvcache, 130);
677 tvcp = afs_FindVCache(&tfid, &retry, 0 /* no stats | LRU */ );
679 ReleaseWriteLock(&afs_xvcache);
682 } while (tvcp && retry);
683 if (!tvcp) { /* otherwise, create manually */
684 tvcp = afs_NewVCache(&tfid, hostp);
685 ObtainWriteLock(&tvcp->lock, 505);
686 ReleaseWriteLock(&afs_xvcache);
687 afs_RemoveVCB(&tfid);
688 ReleaseWriteLock(&tvcp->lock);
690 ReleaseWriteLock(&afs_xvcache);
693 goto done; /* can't happen at present, more's the pity */
695 /* WARNING: afs_DoBulkStat uses the Length field to store a
696 * sequence number for each bulk status request. Under no
697 * circumstances should afs_DoBulkStat store a sequence number
698 * if the new length will be ignored when afs_ProcessFS is
699 * called with new stats. */
701 if (!(tvcp->states & (CStatd | CBulkFetching))
702 && (tvcp->execsOrWriters <= 0)
703 && !afs_DirtyPages(tvcp)
704 && !AFS_VN_MAPPED((vnode_t *) tvcp))
706 if (!(tvcp->states & (CStatd | CBulkFetching))
707 && (tvcp->execsOrWriters <= 0)
708 && !afs_DirtyPages(tvcp))
712 /* this entry doesnt exist in the cache, and is not
713 * already being fetched by someone else, so add it to the
714 * list of file IDs to obtain.
716 * We detect a callback breaking race condition by checking the
717 * CBulkFetching state bit and the value in the file size.
718 * It is safe to set the status only if the CBulkFetching
719 * flag is still set and the value in the file size does
722 * Don't fetch status for dirty files. We need to
723 * preserve the value of the file size. We could
724 * flush the pages, but it wouldn't be worthwhile.
726 memcpy((char *)(fidsp + fidIndex), (char *)&tfid.Fid,
728 tvcp->states |= CBulkFetching;
729 tvcp->m.Length = statSeqNo;
735 /* if dir vnode has non-zero entry */
736 /* move to the next dir entry by adding in the # of entries
737 * used by this dir entry.
739 temp = afs_dir_NameBlobs(dirEntryp->name) << 5;
740 DRelease((struct buffer *)dirEntryp, 0);
744 } /* while loop over all dir entries */
746 /* now release the dir lock and prepare to make the bulk RPC */
747 ReleaseReadLock(&dcp->lock);
748 ReleaseReadLock(&adp->lock);
750 /* release the chunk */
753 /* dont make a null call */
758 /* setup the RPC parm structures */
759 fidParm.AFSCBFids_len = fidIndex;
760 fidParm.AFSCBFids_val = fidsp;
761 statParm.AFSBulkStats_len = fidIndex;
762 statParm.AFSBulkStats_val = statsp;
763 cbParm.AFSCBs_len = fidIndex;
764 cbParm.AFSCBs_val = cbsp;
766 /* start the timer; callback expirations are relative to this */
767 startTime = osi_Time();
769 tcp = afs_Conn(&adp->fid, areqp, SHARED_LOCK);
771 hostp = tcp->srvr->server;
772 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_BULKSTATUS);
775 if (!(tcp->srvr->server->flags & SNO_INLINEBULK)) {
777 RXAFS_InlineBulkStatus(tcp->id, &fidParm, &statParm,
779 if (code == RXGEN_OPCODE) {
780 tcp->srvr->server->flags |= SNO_INLINEBULK;
783 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm,
790 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm, &cbParm,
798 (tcp, code, &adp->fid, areqp, AFS_STATS_FS_RPCIDX_BULKSTATUS,
801 /* now, if we didnt get the info, bail out. */
805 /* we need vol flags to create the entries properly */
806 dotdot.Fid.Volume = 0;
807 volp = afs_GetVolume(&adp->fid, areqp, READ_LOCK);
809 volStates = volp->states;
810 if (volp->dotdot.Fid.Volume != 0)
811 dotdot = volp->dotdot;
815 /* find the place to merge the info into We do this by skipping
816 * nskip entries in the LRU queue. The more we skip, the more
817 * we preserve, since the head of the VLRU queue is the most recently
821 nskip = afs_cacheStats / 2; /* preserved fraction of the cache */
822 ObtainReadLock(&afs_xvcache);
824 /* actually a serious error, probably should panic. Probably will
825 * panic soon, oh well. */
826 ReleaseReadLock(&afs_xvcache);
827 afs_warnuser("afs_DoBulkStat: VLRU empty!");
830 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
831 refpanic("Bulkstat VLRU inconsistent");
833 for (tq = VLRU.next; tq != &VLRU; tq = QNext(tq)) {
836 else if (QNext(QPrev(tq)) != tq) {
838 refpanic("BulkStat VLRU inconsistent");
844 lruvcp = QTOV(VLRU.next);
846 /* now we have to hold this entry, so that it does not get moved
847 * into the free list while we're running. It could still get
848 * moved within the lru queue, but hopefully that will be rare; it
849 * doesn't hurt nearly as much.
852 osi_vnhold(lruvcp, &retry);
853 ReleaseReadLock(&afs_xvcache); /* could be read lock */
857 /* otherwise, merge in the info. We have to be quite careful here,
858 * since we need to ensure that we don't merge old info over newer
859 * stuff in a stat cache entry. We're very conservative here: we don't
860 * do the merge at all unless we ourselves create the stat cache
861 * entry. That's pretty safe, and should work pretty well, since we
862 * typically expect to do the stat cache creation ourselves.
864 * We also have to take into account racing token revocations.
866 for (i = 0; i < fidIndex; i++) {
867 if ((&statsp[i])->errorCode)
869 afid.Cell = adp->fid.Cell;
870 afid.Fid.Volume = adp->fid.Fid.Volume;
871 afid.Fid.Vnode = fidsp[i].Vnode;
872 afid.Fid.Unique = fidsp[i].Unique;
875 ObtainReadLock(&afs_xvcache);
876 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
877 ReleaseReadLock(&afs_xvcache);
878 } while (tvcp && retry);
880 /* The entry may no longer exist */
885 /* now we have the entry held, but we need to fill it in */
886 ObtainWriteLock(&tvcp->lock, 131);
888 /* if CBulkFetching is not set, or if the file size no longer
889 * matches the value we placed there when we set the CBulkFetching
890 * flag, then someone else has done something with this node,
891 * and we may not have the latest status information for this
892 * file. Leave the entry alone.
894 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
896 ReleaseWriteLock(&tvcp->lock);
901 /* now copy ".." entry back out of volume structure, if necessary */
902 if (tvcp->mvstat == 2 && (dotdot.Fid.Volume != 0)) {
904 tvcp->mvid = (struct VenusFid *)
905 osi_AllocSmallSpace(sizeof(struct VenusFid));
906 *tvcp->mvid = dotdot;
909 ObtainWriteLock(&afs_xvcache, 132);
910 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
911 refpanic("Bulkstat VLRU inconsistent2");
913 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
914 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
915 refpanic("Bulkstat VLRU inconsistent4");
917 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
918 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
919 refpanic("Bulkstat VLRU inconsistent5");
922 if (tvcp != lruvcp) { /* if they are == don't move it, don't corrupt vlru */
923 QRemove(&tvcp->vlruq);
924 QAdd(&lruvcp->vlruq, &tvcp->vlruq);
927 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
928 refpanic("Bulkstat VLRU inconsistent3");
930 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
931 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
932 refpanic("Bulkstat VLRU inconsistent5");
934 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
935 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
936 refpanic("Bulkstat VLRU inconsistent6");
938 ReleaseWriteLock(&afs_xvcache);
940 ObtainWriteLock(&afs_xcbhash, 494);
942 /* We need to check the flags again. We may have missed
943 * something while we were waiting for a lock.
945 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
947 ReleaseWriteLock(&tvcp->lock);
948 ReleaseWriteLock(&afs_xcbhash);
953 /* now merge in the resulting status back into the vnode.
954 * We only do this if the entry looks clear.
956 afs_ProcessFS(tvcp, &statsp[i], areqp);
957 #ifdef AFS_LINUX22_ENV
958 /* overwrite the ops if it's a directory or symlink. */
959 if (vType(tvcp) == VDIR)
960 tvcp->v.v_op = &afs_dir_iops;
961 else if (vType(tvcp) == VLNK)
962 tvcp->v.v_op = &afs_symlink_iops;
965 /* do some accounting for bulk stats: mark this entry as
966 * loaded, so we can tell if we use it before it gets
969 tvcp->states |= CBulkStat;
970 tvcp->states &= ~CBulkFetching;
974 /* merge in vol info */
977 if (volStates & VBackup)
978 tvcp->states |= CBackup;
979 if (volStates & VForeign)
980 tvcp->states |= CForeign;
982 /* merge in the callback info */
983 tvcp->states |= CTruth;
985 /* get ptr to the callback we are interested in */
988 if (tcbp->ExpirationTime != 0) {
989 tvcp->cbExpires = tcbp->ExpirationTime + startTime;
990 tvcp->callback = hostp;
991 tvcp->states |= CStatd;
992 afs_QueueCallback(tvcp, CBHash(tcbp->ExpirationTime), volp);
993 } else if (tvcp->states & CRO) {
994 /* ordinary callback on a read-only volume -- AFS 3.2 style */
995 tvcp->cbExpires = 3600 + startTime;
996 tvcp->callback = hostp;
997 tvcp->states |= CStatd;
998 afs_QueueCallback(tvcp, CBHash(3600), volp);
1001 tvcp->states &= ~(CStatd | CUnique);
1002 afs_DequeueCallback(tvcp);
1003 if ((tvcp->states & CForeign) || (vType(tvcp) == VDIR))
1004 osi_dnlc_purgedp(tvcp); /* if it (could be) a directory */
1006 ReleaseWriteLock(&afs_xcbhash);
1008 ReleaseWriteLock(&tvcp->lock);
1009 /* finally, we're done with the entry */
1010 afs_PutVCache(tvcp);
1011 } /* for all files we got back */
1013 /* finally return the pointer into the LRU queue */
1014 afs_PutVCache(lruvcp);
1017 /* Be sure to turn off the CBulkFetching flags */
1018 for (i = flagIndex; i < fidIndex; i++) {
1019 afid.Cell = adp->fid.Cell;
1020 afid.Fid.Volume = adp->fid.Fid.Volume;
1021 afid.Fid.Vnode = fidsp[i].Vnode;
1022 afid.Fid.Unique = fidsp[i].Unique;
1025 ObtainReadLock(&afs_xvcache);
1026 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
1027 ReleaseReadLock(&afs_xvcache);
1028 } while (tvcp && retry);
1029 if (tvcp != NULL && (tvcp->states & CBulkFetching)
1030 && (tvcp->m.Length == statSeqNo)) {
1031 tvcp->states &= ~CBulkFetching;
1034 afs_PutVCache(tvcp);
1038 afs_PutVolume(volp, READ_LOCK);
1040 /* If we did the InlineBulk RPC pull out the return code */
1042 if ((&statsp[0])->errorCode) {
1043 afs_Analyze(tcp, (&statsp[0])->errorCode, &adp->fid, areqp,
1044 AFS_STATS_FS_RPCIDX_BULKSTATUS, SHARED_LOCK, NULL);
1045 code = (&statsp[0])->errorCode;
1050 osi_FreeLargeSpace(statMemp);
1051 osi_FreeLargeSpace(cbfMemp);
1055 /* was: (AFS_DEC_ENV) || defined(AFS_OSF30_ENV) || defined(AFS_NCR_ENV) */
1056 static int AFSDOBULK = 1;
1060 afs_lookup(adp, ndp)
1062 struct nameidata *ndp;
1064 char aname[MAXNAMLEN + 1]; /* XXX */
1065 struct vcache **avcp = (struct vcache **)&(ndp->ni_vp);
1066 struct ucred *acred = ndp->ni_cred;
1067 int wantparent = ndp->ni_nameiop & WANTPARENT;
1068 int opflag = ndp->ni_nameiop & OPFLAG;
1069 #else /* AFS_OSF_ENV */
1070 #if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
1071 afs_lookup(OSI_VC_ARG(adp), aname, avcp, pnp, flags, rdir, acred)
1072 struct pathname *pnp;
1076 #if defined(UKERNEL)
1077 afs_lookup(adp, aname, avcp, acred, flags)
1080 afs_lookup(adp, aname, avcp, acred)
1081 #endif /* UKERNEL */
1082 #endif /* SUN5 || SGI */
1084 struct vcache **avcp;
1086 struct AFS_UCRED *acred;
1089 struct vrequest treq;
1091 register struct vcache *tvc = 0;
1092 register afs_int32 code;
1093 register afs_int32 bulkcode = 0;
1094 int pass = 0, hit = 0;
1096 extern afs_int32 afs_mariner; /*Writing activity to log? */
1098 afs_hyper_t versionNo;
1099 int no_read_access = 0;
1100 struct sysname_info sysState; /* used only for @sys checking */
1101 int dynrootRetry = 1;
1102 struct afs_fakestat_state fakestate;
1103 int tryEvalOnly = 0;
1105 AFS_STATCNT(afs_lookup);
1106 afs_InitFakeStat(&fakestate);
1108 if ((code = afs_InitReq(&treq, acred)))
1112 ndp->ni_dvp = AFSTOV(adp);
1113 memcpy(aname, ndp->ni_ptr, ndp->ni_namelen);
1114 aname[ndp->ni_namelen] = '\0';
1115 #endif /* AFS_OSF_ENV */
1117 #if defined(AFS_DARWIN_ENV)
1118 /* Workaround for MacOSX Finder, which tries to look for
1119 * .DS_Store and Contents under every directory.
1121 if (afs_fakestat_enable && adp->mvstat == 1) {
1122 if (strcmp(aname, ".DS_Store") == 0)
1124 if (strcmp(aname, "Contents") == 0)
1130 code = afs_TryEvalFakeStat(&adp, &fakestate, &treq);
1132 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
1133 if (tryEvalOnly && adp->mvstat == 1)
1138 *avcp = NULL; /* Since some callers don't initialize it */
1140 /* come back to here if we encounter a non-existent object in a read-only
1141 * volume's directory */
1144 *avcp = NULL; /* Since some callers don't initialize it */
1147 if (!(adp->states & CStatd)) {
1148 if ((code = afs_VerifyVCache2(adp, &treq))) {
1154 /* watch for ".." in a volume root */
1155 if (adp->mvstat == 2 && aname[0] == '.' && aname[1] == '.' && !aname[2]) {
1156 /* looking up ".." in root via special hacks */
1157 if (adp->mvid == (struct VenusFid *)0 || adp->mvid->Fid.Volume == 0) {
1159 extern struct vcache *afs_globalVp;
1160 if (adp == afs_globalVp) {
1161 struct vnode *rvp = AFSTOV(adp);
1163 ndp->ni_vp = rvp->v_vfsp->vfs_vnodecovered;
1164 ndp->ni_dvp = ndp->ni_vp;
1174 /* otherwise we have the fid here, so we use it */
1175 tvc = afs_GetVCache(adp->mvid, &treq, NULL, NULL);
1176 afs_Trace3(afs_iclSetp, CM_TRACE_GETVCDOTDOT, ICL_TYPE_FID, adp->mvid,
1177 ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32, code);
1179 code = (tvc ? 0 : ENOENT);
1181 if (tvc && !VREFCOUNT(tvc)) {
1185 /*printf("LOOKUP GETVCDOTDOT -> %d\n", code); */
1190 /* now check the access */
1191 if (treq.uid != adp->last_looker) {
1192 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
1197 adp->last_looker = treq.uid;
1200 /* Check for read access as well. We need read access in order to
1201 * stat files, but not to stat subdirectories. */
1202 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS))
1205 /* special case lookup of ".". Can we check for it sooner in this code,
1206 * for instance, way up before "redo:" ??
1207 * I'm not fiddling with the LRUQ here, either, perhaps I should, or else
1208 * invent a lightweight version of GetVCache.
1210 if (aname[0] == '.' && !aname[1]) { /* special case */
1211 ObtainReadLock(&afs_xvcache);
1213 ReleaseReadLock(&afs_xvcache);
1217 if (adp && !VREFCOUNT(adp)) {
1223 Check_AtSys(adp, aname, &sysState, &treq);
1224 tname = sysState.name;
1226 /* 1st Check_AtSys and lookup by tname is required here, for now,
1227 * because the dnlc is *not* told to remove entries for the parent
1228 * dir of file/dir op that afs_LocalHero likes, but dnlc is informed
1229 * if the cached entry for the parent dir is invalidated for a
1231 * Otherwise, we'd be able to do a dnlc lookup on an entry ending
1232 * w/@sys and know the dnlc was consistent with reality. */
1233 tvc = osi_dnlc_lookup(adp, tname, WRITE_LOCK);
1234 *avcp = tvc; /* maybe wasn't initialized, but it is now */
1236 if (no_read_access && vType(tvc) != VDIR && vType(tvc) != VLNK) {
1237 /* need read access on dir to stat non-directory / non-link */
1243 #ifdef AFS_LINUX22_ENV
1244 if (tvc->mvstat == 2) { /* we don't trust the dnlc for root vcaches */
1252 #else /* non - LINUX */
1256 #endif /* linux22 */
1259 { /* sub-block just to reduce stack usage */
1260 register struct dcache *tdc;
1261 afs_size_t dirOffset, dirLen;
1263 struct VenusFid tfid;
1265 /* now we have to lookup the next fid */
1267 afs_GetDCache(adp, (afs_size_t) 0, &treq, &dirOffset, &dirLen, 1);
1269 *avcp = NULL; /* redundant, but harmless */
1274 /* now we will just call dir package with appropriate inode.
1275 * Dirs are always fetched in their entirety for now */
1276 ObtainReadLock(&adp->lock);
1277 ObtainReadLock(&tdc->lock);
1280 * Make sure that the data in the cache is current. There are two
1281 * cases we need to worry about:
1282 * 1. The cache data is being fetched by another process.
1283 * 2. The cache data is no longer valid
1285 while ((adp->states & CStatd)
1286 && (tdc->dflags & DFFetching)
1287 && hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1288 ReleaseReadLock(&tdc->lock);
1289 ReleaseReadLock(&adp->lock);
1290 afs_osi_Sleep(&tdc->validPos);
1291 ObtainReadLock(&adp->lock);
1292 ObtainReadLock(&tdc->lock);
1294 if (!(adp->states & CStatd)
1295 || !hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1296 ReleaseReadLock(&tdc->lock);
1297 ReleaseReadLock(&adp->lock);
1299 if (tname && tname != aname)
1300 osi_FreeLargeSpace(tname);
1304 /* Save the version number for when we call osi_dnlc_enter */
1305 hset(versionNo, tdc->f.versionNo);
1308 * check for, and handle "@sys" if it's there. We should be able
1309 * to avoid the alloc and the strcpy with a little work, but it's
1310 * not pressing. If there aren't any remote users (ie, via the
1311 * NFS translator), we have a slightly easier job.
1312 * the faster way to do this is to check for *aname == '@' and if
1313 * it's there, check for @sys, otherwise, assume there's no @sys
1314 * then, if the lookup fails, check for .*@sys...
1316 /* above now implemented by Check_AtSys and Next_AtSys */
1318 /* lookup the name in the appropriate dir, and return a cache entry
1319 * on the resulting fid */
1320 theDir = tdc->f.inode;
1322 afs_dir_LookupOffset(&theDir, sysState.name, &tfid.Fid,
1325 /* If the first lookup doesn't succeed, maybe it's got @sys in the name */
1326 while (code == ENOENT && Next_AtSys(adp, &treq, &sysState))
1328 afs_dir_LookupOffset(&theDir, sysState.name, &tfid.Fid,
1330 tname = sysState.name;
1332 ReleaseReadLock(&tdc->lock);
1335 if (code == ENOENT && afs_IsDynroot(adp) && dynrootRetry) {
1336 ReleaseReadLock(&adp->lock);
1338 if (tname[0] == '.')
1339 afs_LookupAFSDB(tname + 1);
1341 afs_LookupAFSDB(tname);
1342 if (tname && tname != aname)
1343 osi_FreeLargeSpace(tname);
1346 ReleaseReadLock(&adp->lock);
1349 /* new fid has same cell and volume */
1350 tfid.Cell = adp->fid.Cell;
1351 tfid.Fid.Volume = adp->fid.Fid.Volume;
1352 afs_Trace4(afs_iclSetp, CM_TRACE_LOOKUP, ICL_TYPE_POINTER, adp,
1353 ICL_TYPE_STRING, tname, ICL_TYPE_FID, &tfid,
1354 ICL_TYPE_INT32, code);
1357 if (code != ENOENT) {
1358 printf("LOOKUP dirLookupOff -> %d\n", code);
1363 /* prefetch some entries, if the dir is currently open. The variable
1364 * dirCookie tells us where to start prefetching from.
1366 if (AFSDOBULK && adp->opens > 0 && !(adp->states & CForeign)
1367 && !afs_IsDynroot(adp)) {
1369 /* if the entry is not in the cache, or is in the cache,
1370 * but hasn't been statd, then do a bulk stat operation.
1374 ObtainReadLock(&afs_xvcache);
1375 tvc = afs_FindVCache(&tfid, &retry, 0 /* !stats,!lru */ );
1376 ReleaseReadLock(&afs_xvcache);
1377 } while (tvc && retry);
1379 if (!tvc || !(tvc->states & CStatd))
1380 bulkcode = afs_DoBulkStat(adp, dirCookie, &treq);
1384 /* if the vcache isn't usable, release it */
1385 if (tvc && !(tvc->states & CStatd)) {
1394 /* now get the status info, if we don't already have it */
1395 /* This is kind of weird, but we might wind up accidentally calling
1396 * RXAFS_Lookup because we happened upon a file which legitimately
1397 * has a 0 uniquifier. That is the result of allowing unique to wrap
1398 * to 0. This was fixed in AFS 3.4. For CForeign, Unique == 0 means that
1399 * the file has not yet been looked up.
1402 afs_int32 cached = 0;
1403 if (!tfid.Fid.Unique && (adp->states & CForeign)) {
1404 tvc = afs_LookupVCache(&tfid, &treq, &cached, adp, tname);
1406 if (!tvc && !bulkcode) { /* lookup failed or wasn't called */
1407 tvc = afs_GetVCache(&tfid, &treq, &cached, NULL);
1410 } /* sub-block just to reduce stack usage */
1413 int force_eval = afs_fakestat_enable ? 0 : 1;
1415 if (adp->states & CForeign)
1416 tvc->states |= CForeign;
1417 tvc->parentVnode = adp->fid.Fid.Vnode;
1418 tvc->parentUnique = adp->fid.Fid.Unique;
1419 tvc->states &= ~CBulkStat;
1421 if (afs_fakestat_enable == 2 && tvc->mvstat == 1) {
1422 ObtainSharedLock(&tvc->lock, 680);
1423 if (!tvc->linkData) {
1424 UpgradeSToWLock(&tvc->lock, 681);
1425 code = afs_HandleLink(tvc, &treq);
1426 ConvertWToRLock(&tvc->lock);
1428 ConvertSToRLock(&tvc->lock);
1431 if (!code && !afs_strchr(tvc->linkData, ':'))
1433 ReleaseReadLock(&tvc->lock);
1435 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1436 if (!(flags & AFS_LOOKUP_NOEVAL))
1437 /* don't eval mount points */
1438 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1439 if (tvc->mvstat == 1 && force_eval) {
1440 /* a mt point, possibly unevaluated */
1441 struct volume *tvolp;
1443 ObtainWriteLock(&tvc->lock, 133);
1444 code = EvalMountPoint(tvc, adp, &tvolp, &treq);
1445 ReleaseWriteLock(&tvc->lock);
1450 afs_PutVolume(tvolp, WRITE_LOCK);
1454 /* next, we want to continue using the target of the mt point */
1455 if (tvc->mvid && (tvc->states & CMValid)) {
1457 /* now lookup target, to set .. pointer */
1458 afs_Trace2(afs_iclSetp, CM_TRACE_LOOKUP1,
1459 ICL_TYPE_POINTER, tvc, ICL_TYPE_FID,
1461 uvc = tvc; /* remember for later */
1463 if (tvolp && (tvolp->states & VForeign)) {
1464 /* XXXX tvolp has ref cnt on but not locked! XXX */
1466 afs_GetRootVCache(tvc->mvid, &treq, NULL, tvolp);
1468 tvc = afs_GetVCache(tvc->mvid, &treq, NULL, NULL);
1470 afs_PutVCache(uvc); /* we're done with it */
1475 afs_PutVolume(tvolp, WRITE_LOCK);
1480 /* now, if we came via a new mt pt (say because of a new
1481 * release of a R/O volume), we must reevaluate the ..
1482 * ptr to point back to the appropriate place */
1484 ObtainWriteLock(&tvc->lock, 134);
1485 if (tvc->mvid == NULL) {
1486 tvc->mvid = (struct VenusFid *)
1487 osi_AllocSmallSpace(sizeof(struct VenusFid));
1489 /* setup backpointer */
1490 *tvc->mvid = tvolp->dotdot;
1491 ReleaseWriteLock(&tvc->lock);
1492 afs_PutVolume(tvolp, WRITE_LOCK);
1498 afs_PutVolume(tvolp, WRITE_LOCK);
1503 if (tvc && !VREFCOUNT(tvc)) {
1508 /* if we get here, we found something in a directory that couldn't
1509 * be located (a Multics "connection failure"). If the volume is
1510 * read-only, we try flushing this entry from the cache and trying
1514 tv = afs_GetVolume(&adp->fid, &treq, READ_LOCK);
1516 if (tv->states & VRO) {
1517 pass = 1; /* try this *once* */
1518 ObtainWriteLock(&afs_xcbhash, 495);
1519 afs_DequeueCallback(adp);
1520 /* re-stat to get later version */
1521 adp->states &= ~CStatd;
1522 ReleaseWriteLock(&afs_xcbhash);
1523 osi_dnlc_purgedp(adp);
1524 afs_PutVolume(tv, READ_LOCK);
1527 afs_PutVolume(tv, READ_LOCK);
1534 /* put the network buffer back, if need be */
1535 if (tname != aname && tname)
1536 osi_FreeLargeSpace(tname);
1539 /* Handle RENAME; only need to check rename "." */
1540 if (opflag == RENAME && wantparent && *ndp->ni_next == 0) {
1541 if (!FidCmp(&(tvc->fid), &(adp->fid))) {
1542 afs_PutVCache(*avcp);
1544 afs_PutFakeStat(&fakestate);
1545 return afs_CheckCode(EISDIR, &treq, 18);
1548 #endif /* AFS_OSF_ENV */
1551 afs_AddMarinerName(aname, tvc);
1553 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1554 if (!(flags & AFS_LOOKUP_NOEVAL))
1555 /* Here we don't enter the name into the DNLC because we want the
1556 * evaluated mount dir to be there (the vcache for the mounted volume)
1557 * rather than the vc of the mount point itself. we can still find the
1558 * mount point's vc in the vcache by its fid. */
1559 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1561 osi_dnlc_enter(adp, aname, tvc, &versionNo);
1563 #ifdef AFS_LINUX20_ENV
1564 /* So Linux inode cache is up to date. */
1565 code = afs_VerifyVCache(tvc, &treq);
1567 afs_PutFakeStat(&fakestate);
1568 return 0; /* can't have been any errors if hit and !code */
1575 code = afs_CheckCode(code, &treq, 19);
1577 /* If there is an error, make sure *avcp is null.
1578 * Alphas panic otherwise - defect 10719.
1583 afs_PutFakeStat(&fakestate);