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();
35 afs_int32 afs_bkvolpref = 0;
36 afs_int32 afs_bulkStatsDone;
37 static int bulkStatCounter = 0; /* counter for bulk stat seq. numbers */
38 int afs_fakestat_enable = 0; /* 1: fakestat-all, 2: fakestat-crosscell */
41 /* this would be faster if it did comparison as int32word, but would be
42 * dependant on byte-order and alignment, and I haven't figured out
43 * what "@sys" is in binary... */
44 #define AFS_EQ_ATSYS(name) (((name)[0]=='@')&&((name)[1]=='s')&&((name)[2]=='y')&&((name)[3]=='s')&&(!(name)[4]))
46 /* call under write lock, evaluate mvid field from a mt pt.
47 * avc is the vnode of the mount point object; must be write-locked.
48 * advc is the vnode of the containing directory (optional; if NULL and
49 * EvalMountPoint succeeds, caller must initialize *avolpp->dotdot)
50 * avolpp is where we return a pointer to the volume named by the mount pt, if success
51 * areq is the identity of the caller.
53 * NOTE: this function returns a held volume structure in *volpp if it returns 0!
56 EvalMountPoint(register struct vcache *avc, struct vcache *advc,
57 struct volume **avolpp, register struct vrequest *areq)
60 struct volume *tvp = 0;
63 char *cpos, *volnamep;
65 afs_int32 prefetch; /* 1=>None 2=>RO 3=>BK */
66 afs_int32 mtptCell, assocCell = 0, hac = 0;
67 afs_int32 samecell, roname, len;
69 AFS_STATCNT(EvalMountPoint);
71 if (avc->mvid && (avc->states & CMValid))
72 return 0; /* done while racing */
75 code = afs_HandleLink(avc, areq);
79 /* Determine which cell and volume the mointpoint goes to */
80 type = avc->linkData[0]; /* '#'=>Regular '%'=>RW */
81 cpos = afs_strchr(&avc->linkData[1], ':'); /* if cell name present */
85 tcell = afs_GetCellByName(&avc->linkData[1], READ_LOCK);
88 volnamep = &avc->linkData[1];
89 tcell = afs_GetCell(avc->fid.Cell, READ_LOCK);
94 mtptCell = tcell->cellNum; /* The cell for the mountpoint */
96 hac = 1; /* has associated cell */
97 assocCell = tcell->lcellp->cellNum; /* The associated cell */
99 afs_PutCell(tcell, READ_LOCK);
101 /* Is volume name a "<n>.backup" or "<n>.readonly" name */
102 len = strlen(volnamep);
103 roname = ((len > 9) && (strcmp(&volnamep[len - 9], ".readonly") == 0))
104 || ((len > 7) && (strcmp(&volnamep[len - 7], ".backup") == 0));
106 /* When we cross mountpoint, do we stay in the same cell */
107 samecell = (avc->fid.Cell == mtptCell) || (hac
111 /* Decide whether to prefetch the BK, or RO. Also means we want the BK or
113 * If this is a regular mountpoint with a RW volume name
114 * - If BK preference is enabled AND we remain within the same cell AND
115 * start from a BK volume, then we will want to prefetch the BK volume.
116 * - If we cross a cell boundary OR start from a RO volume, then we will
117 * want to prefetch the RO volume.
119 if ((type == '#') && !roname) {
120 if (afs_bkvolpref && samecell && (avc->states & CBackup))
121 prefetch = 3; /* Prefetch the BK */
122 else if (!samecell || (avc->states & CRO))
123 prefetch = 2; /* Prefetch the RO */
125 prefetch = 1; /* Do not prefetch */
127 prefetch = 1; /* Do not prefetch */
130 /* Get the volume struct. Unless this volume name has ".readonly" or
131 * ".backup" in it, this will get the volume struct for the RW volume.
132 * The RO volume will be prefetched if requested (but not returned).
134 tvp = afs_GetVolumeByName(volnamep, mtptCell, prefetch, areq, WRITE_LOCK);
136 /* If no volume was found in this cell, try the associated linked cell */
137 if (!tvp && hac && areq->volumeError) {
139 afs_GetVolumeByName(volnamep, assocCell, prefetch, areq,
143 /* Still not found. If we are looking for the RO, then perhaps the RW
144 * doesn't exist? Try adding ".readonly" to volname and look for that.
145 * Don't know why we do this. Would have still found it in above call - jpm.
147 if (!tvp && (prefetch == 2) && len < AFS_SMALLOCSIZ - 10) {
148 buf = (char *)osi_AllocSmallSpace(len + 10);
150 strcpy(buf, volnamep);
151 afs_strcat(buf, ".readonly");
153 tvp = afs_GetVolumeByName(buf, mtptCell, 1, areq, WRITE_LOCK);
155 /* Try the associated linked cell if failed */
156 if (!tvp && hac && areq->volumeError) {
157 tvp = afs_GetVolumeByName(buf, assocCell, 1, areq, WRITE_LOCK);
159 osi_FreeSmallSpace(buf);
163 return ENODEV; /* Couldn't find the volume */
165 /* Don't cross mountpoint from a BK to a BK volume */
166 if ((avc->states & CBackup) && (tvp->states & VBackup)) {
167 afs_PutVolume(tvp, WRITE_LOCK);
171 /* If we want (prefetched) the BK and it exists, then drop the RW volume
173 * Otherwise, if we want (prefetched0 the RO and it exists, then drop the
174 * RW volume and get the RO.
175 * Otherwise, go with the RW.
177 if ((prefetch == 3) && tvp->backVol) {
178 tfid.Fid.Volume = tvp->backVol; /* remember BK volume */
179 tfid.Cell = tvp->cell;
180 afs_PutVolume(tvp, WRITE_LOCK); /* release old volume */
181 tvp = afs_GetVolume(&tfid, areq, WRITE_LOCK); /* get the new one */
183 return ENODEV; /* oops, can't do it */
184 } else if ((prefetch >= 2) && tvp->roVol) {
185 tfid.Fid.Volume = tvp->roVol; /* remember RO volume */
186 tfid.Cell = tvp->cell;
187 afs_PutVolume(tvp, WRITE_LOCK); /* release old volume */
188 tvp = afs_GetVolume(&tfid, areq, WRITE_LOCK); /* get the new one */
190 return ENODEV; /* oops, can't do it */
195 (struct VenusFid *)osi_AllocSmallSpace(sizeof(struct VenusFid));
196 avc->mvid->Cell = tvp->cell;
197 avc->mvid->Fid.Volume = tvp->volume;
198 avc->mvid->Fid.Vnode = 1;
199 avc->mvid->Fid.Unique = 1;
200 avc->states |= CMValid;
202 /* Used to: if the mount point is stored within a backup volume,
203 * then we should only update the parent pointer information if
204 * there's none already set, so as to avoid updating a volume's ..
205 * info with something in an OldFiles directory.
207 * Next two lines used to be under this if:
209 * if (!(avc->states & CBackup) || tvp->dotdot.Fid.Volume == 0)
211 * Now: update mount point back pointer on every call, so that we handle
212 * multiple mount points better. This way, when du tries to go back
213 * via chddir(".."), it will end up exactly where it started, yet
214 * cd'ing via a new path to a volume will reset the ".." pointer
217 tvp->mtpoint = avc->fid; /* setup back pointer to mtpoint */
219 tvp->dotdot = advc->fid;
228 * Must be called on an afs_fakestat_state object before calling
229 * afs_EvalFakeStat or afs_PutFakeStat. Calling afs_PutFakeStat
230 * without calling afs_EvalFakeStat is legal, as long as this
231 * function is called.
234 afs_InitFakeStat(struct afs_fakestat_state *state)
236 if (!afs_fakestat_enable)
241 state->need_release = 0;
245 * afs_EvalFakeStat_int
247 * The actual implementation of afs_EvalFakeStat and afs_TryEvalFakeStat,
248 * which is called by those wrapper functions.
250 * Only issues RPCs if canblock is non-zero.
253 afs_EvalFakeStat_int(struct vcache **avcp, struct afs_fakestat_state *state,
254 struct vrequest *areq, int canblock)
256 struct vcache *tvc, *root_vp;
257 struct volume *tvolp = NULL;
260 if (!afs_fakestat_enable)
263 osi_Assert(state->valid == 1);
264 osi_Assert(state->did_eval == 0);
268 if (tvc->mvstat != 1)
271 /* Is the call to VerifyVCache really necessary? */
272 code = afs_VerifyVCache(tvc, areq);
276 ObtainWriteLock(&tvc->lock, 599);
277 code = EvalMountPoint(tvc, NULL, &tvolp, areq);
278 ReleaseWriteLock(&tvc->lock);
282 tvolp->dotdot = tvc->fid;
283 tvolp->dotdot.Fid.Vnode = tvc->parentVnode;
284 tvolp->dotdot.Fid.Unique = tvc->parentUnique;
287 if (tvc->mvid && (tvc->states & CMValid)) {
293 ObtainWriteLock(&afs_xvcache, 597);
294 root_vp = afs_FindVCache(tvc->mvid, &retry, 0);
295 if (root_vp && retry) {
296 ReleaseWriteLock(&afs_xvcache);
297 afs_PutVCache(root_vp);
299 } while (root_vp && retry);
300 ReleaseWriteLock(&afs_xvcache);
302 root_vp = afs_GetVCache(tvc->mvid, areq, NULL, NULL);
305 code = canblock ? ENOENT : 0;
308 #ifdef AFS_DARWIN80_ENV
309 root_vp->m.Type = VDIR;
311 code = afs_darwin_finalizevnode(root_vp, NULL, NULL, 0);
314 vnode_ref(AFSTOV(root_vp));
317 /* Is this always kosher? Perhaps we should instead use
318 * NBObtainWriteLock to avoid potential deadlock.
320 ObtainWriteLock(&root_vp->lock, 598);
322 root_vp->mvid = osi_AllocSmallSpace(sizeof(struct VenusFid));
323 *root_vp->mvid = tvolp->dotdot;
324 ReleaseWriteLock(&root_vp->lock);
326 state->need_release = 1;
327 state->root_vp = root_vp;
331 code = canblock ? ENOENT : 0;
336 afs_PutVolume(tvolp, WRITE_LOCK);
343 * Automatically does the equivalent of EvalMountPoint for vcache entries
344 * which are mount points. Remembers enough state to properly release
345 * the volume root vcache when afs_PutFakeStat() is called.
347 * State variable must be initialized by afs_InitFakeState() beforehand.
349 * Returns 0 when everything succeeds and *avcp points to the vcache entry
350 * that should be used for the real vnode operation. Returns non-zero if
351 * something goes wrong and the error code should be returned to the user.
354 afs_EvalFakeStat(struct vcache **avcp, struct afs_fakestat_state *state,
355 struct vrequest *areq)
357 return afs_EvalFakeStat_int(avcp, state, areq, 1);
361 * afs_TryEvalFakeStat
363 * Same as afs_EvalFakeStat, but tries not to talk to remote servers
364 * and only evaluate the mount point if all the data is already in
367 * Returns 0 if everything succeeds and *avcp points to a valid
368 * vcache entry (possibly evaluated).
371 afs_TryEvalFakeStat(struct vcache **avcp, struct afs_fakestat_state *state,
372 struct vrequest *areq)
374 return afs_EvalFakeStat_int(avcp, state, areq, 0);
380 * Perform any necessary cleanup at the end of a vnode op, given that
381 * afs_InitFakeStat was previously called with this state.
384 afs_PutFakeStat(struct afs_fakestat_state *state)
386 if (!afs_fakestat_enable)
389 osi_Assert(state->valid == 1);
390 if (state->need_release)
391 afs_PutVCache(state->root_vp);
396 afs_ENameOK(register char *aname)
400 AFS_STATCNT(ENameOK);
401 tlen = strlen(aname);
402 if (tlen >= 4 && strcmp(aname + tlen - 4, "@sys") == 0)
408 afs_getsysname(register struct vrequest *areq, register struct vcache *adp,
409 register char *bufp, int *num, char **sysnamelist[])
411 register struct unixuser *au;
412 register afs_int32 error;
414 AFS_STATCNT(getsysname);
416 *sysnamelist = afs_sysnamelist;
418 if (!afs_nfsexporter)
419 strcpy(bufp, (*sysnamelist)[0]);
421 au = afs_GetUser(areq->uid, adp->fid.Cell, 0);
423 error = EXP_SYSNAME(au->exporter, (char *)0, sysnamelist, num);
425 strcpy(bufp, "@sys");
429 strcpy(bufp, (*sysnamelist)[0]);
432 strcpy(bufp, afs_sysname);
439 Check_AtSys(register struct vcache *avc, const char *aname,
440 struct sysname_info *state, struct vrequest *areq)
443 char **sysnamelist[MAXNUMSYSNAMES];
445 if (AFS_EQ_ATSYS(aname)) {
447 state->name = (char *)osi_AllocLargeSpace(AFS_SMALLOCSIZ);
450 afs_getsysname(areq, avc, state->name, &num, sysnamelist);
455 state->name = (char *)aname;
460 Next_AtSys(register struct vcache *avc, struct vrequest *areq,
461 struct sysname_info *state)
463 int num = afs_sysnamecount;
464 char **sysnamelist[MAXNUMSYSNAMES];
466 if (state->index == -1)
467 return 0; /* No list */
469 /* Check for the initial state of aname != "@sys" in Check_AtSys */
470 if (state->offset == -1 && state->allocked == 0) {
471 register char *tname;
473 /* Check for .*@sys */
474 for (tname = state->name; *tname; tname++)
475 /*Move to the end of the string */ ;
477 if ((tname > state->name + 4) && (AFS_EQ_ATSYS(tname - 4))) {
478 state->offset = (tname - 4) - state->name;
479 tname = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
480 strncpy(tname, state->name, state->offset);
485 afs_getsysname(areq, avc, state->name + state->offset, &num,
489 return 0; /* .*@sys doesn't match either */
491 register struct unixuser *au;
492 register afs_int32 error;
494 *sysnamelist = afs_sysnamelist;
496 if (afs_nfsexporter) {
497 au = afs_GetUser(areq->uid, avc->fid.Cell, 0);
500 EXP_SYSNAME(au->exporter, (char *)0, sysnamelist, num);
507 if (++(state->index) >= num || !(*sysnamelist)[(unsigned int)state->index])
508 return 0; /* end of list */
510 strcpy(state->name + state->offset, (*sysnamelist)[(unsigned int)state->index]);
514 extern int BlobScan(struct dcache * afile, afs_int32 ablob);
516 /* called with an unlocked directory and directory cookie. Areqp
517 * describes who is making the call.
518 * Scans the next N (about 30, typically) directory entries, and does
519 * a bulk stat call to stat them all.
521 * Must be very careful when merging in RPC responses, since we dont
522 * want to overwrite newer info that was added by a file system mutating
523 * call that ran concurrently with our bulk stat call.
525 * We do that, as described below, by not merging in our info (always
526 * safe to skip the merge) if the status info is valid in the vcache entry.
528 * If adapt ever implements the bulk stat RPC, then this code will need to
529 * ensure that vcaches created for failed RPC's to older servers have the
532 static struct vcache *BStvc = NULL;
535 afs_DoBulkStat(struct vcache *adp, long dirCookie, struct vrequest *areqp)
537 int nentries; /* # of entries to prefetch */
538 int nskip; /* # of slots in the LRU queue to skip */
539 struct vcache *lruvcp; /* vcache ptr of our goal pos in LRU queue */
540 struct dcache *dcp; /* chunk containing the dir block */
541 char *statMemp; /* status memory block */
542 char *cbfMemp; /* callback and fid memory block */
543 afs_size_t temp; /* temp for holding chunk length, &c. */
544 struct AFSFid *fidsp; /* file IDs were collecting */
545 struct AFSCallBack *cbsp; /* call back pointers */
546 struct AFSCallBack *tcbp; /* temp callback ptr */
547 struct AFSFetchStatus *statsp; /* file status info */
548 struct AFSVolSync volSync; /* vol sync return info */
549 struct vcache *tvcp; /* temp vcp */
550 struct afs_q *tq; /* temp queue variable */
551 AFSCBFids fidParm; /* file ID parm for bulk stat */
552 AFSBulkStats statParm; /* stat info parm for bulk stat */
553 int fidIndex = 0; /* which file were stating */
554 struct conn *tcp = 0; /* conn for call */
555 AFSCBs cbParm; /* callback parm for bulk stat */
556 struct server *hostp = 0; /* host we got callback from */
557 long startTime; /* time we started the call,
558 * for callback expiration base
560 afs_size_t statSeqNo = 0; /* Valued of file size to detect races */
561 int code; /* error code */
562 long newIndex; /* new index in the dir */
563 struct DirEntry *dirEntryp; /* dir entry we are examining */
565 struct VenusFid afid; /* file ID we are using now */
566 struct VenusFid tfid; /* another temp. file ID */
567 afs_int32 retry; /* handle low-level SGI MP race conditions */
568 long volStates; /* flags from vol structure */
569 struct volume *volp = 0; /* volume ptr */
570 struct VenusFid dotdot;
571 int flagIndex = 0; /* First file with bulk fetch flag set */
572 int inlinebulk = 0; /* Did we use InlineBulk RPC or not? */
574 #ifdef AFS_DARWIN80_ENV
575 panic("bulkstatus doesn't work on AFS_DARWIN80_ENV. don't call it");
577 /* first compute some basic parameters. We dont want to prefetch more
578 * than a fraction of the cache in any given call, and we want to preserve
579 * a portion of the LRU queue in any event, so as to avoid thrashing
580 * the entire stat cache (we will at least leave some of it alone).
581 * presently dont stat more than 1/8 the cache in any one call. */
582 nentries = afs_cacheStats / 8;
584 /* dont bother prefetching more than one calls worth of info */
585 if (nentries > AFSCBMAX)
588 /* heuristic to make sure that things fit in 4K. This means that
589 * we shouldnt make it any bigger than 47 entries. I am typically
590 * going to keep it a little lower, since we don't want to load
591 * too much of the stat cache.
596 /* now, to reduce the stack size, well allocate two 4K blocks,
597 * one for fids and callbacks, and one for stat info. Well set
598 * up our pointers to the memory from there, too.
600 statMemp = osi_AllocLargeSpace(nentries * sizeof(AFSFetchStatus));
601 statsp = (struct AFSFetchStatus *)statMemp;
603 osi_AllocLargeSpace(nentries *
604 (sizeof(AFSCallBack) + sizeof(AFSFid)));
605 fidsp = (AFSFid *) cbfMemp;
606 cbsp = (AFSCallBack *) (cbfMemp + nentries * sizeof(AFSFid));
608 /* next, we must iterate over the directory, starting from the specified
609 * cookie offset (dirCookie), and counting out nentries file entries.
610 * We skip files that already have stat cache entries, since we
611 * dont want to bulk stat files that are already in the cache.
614 code = afs_VerifyVCache(adp, areqp);
618 dcp = afs_GetDCache(adp, (afs_size_t) 0, areqp, &temp, &temp, 1);
624 /* lock the directory cache entry */
625 ObtainReadLock(&adp->lock);
626 ObtainReadLock(&dcp->lock);
629 * Make sure that the data in the cache is current. There are two
630 * cases we need to worry about:
631 * 1. The cache data is being fetched by another process.
632 * 2. The cache data is no longer valid
634 while ((adp->states & CStatd)
635 && (dcp->dflags & DFFetching)
636 && hsame(adp->m.DataVersion, dcp->f.versionNo)) {
637 afs_Trace4(afs_iclSetp, CM_TRACE_DCACHEWAIT, ICL_TYPE_STRING,
638 __FILE__, ICL_TYPE_INT32, __LINE__, ICL_TYPE_POINTER, dcp,
639 ICL_TYPE_INT32, dcp->dflags);
640 ReleaseReadLock(&dcp->lock);
641 ReleaseReadLock(&adp->lock);
642 afs_osi_Sleep(&dcp->validPos);
643 ObtainReadLock(&adp->lock);
644 ObtainReadLock(&dcp->lock);
646 if (!(adp->states & CStatd)
647 || !hsame(adp->m.DataVersion, dcp->f.versionNo)) {
648 ReleaseReadLock(&dcp->lock);
649 ReleaseReadLock(&adp->lock);
654 /* Generate a sequence number so we can tell whether we should
655 * store the attributes when processing the response. This number is
656 * stored in the file size when we set the CBulkFetching bit. If the
657 * CBulkFetching is still set and this value hasn't changed, then
658 * we know we were the last to set CBulkFetching bit for this file,
659 * and it is safe to set the status information for this file.
661 statSeqNo = bulkStatCounter++;
663 /* now we have dir data in the cache, so scan the dir page */
666 while (1) { /* Should probably have some constant bound */
667 /* look for first safe entry to examine in the directory. BlobScan
668 * looks for a the 1st allocated dir after the dirCookie slot.
670 newIndex = BlobScan(dcp, (dirCookie >> 5));
674 /* remember the updated directory cookie */
675 dirCookie = newIndex << 5;
677 /* get a ptr to the dir entry */
679 (struct DirEntry *)afs_dir_GetBlob(dcp, newIndex);
683 /* dont copy more than we have room for */
684 if (fidIndex >= nentries) {
685 DRelease((struct buffer *)dirEntryp, 0);
689 /* now, if the dir entry looks good, copy it out to our list. Vnode
690 * 0 means deleted, although it should also be free were it deleted.
692 if (dirEntryp->fid.vnode != 0) {
693 /* dont copy entries we have in our cache. This check will
694 * also make us skip "." and probably "..", unless it has
695 * disappeared from the cache since we did our namei call.
697 tfid.Cell = adp->fid.Cell;
698 tfid.Fid.Volume = adp->fid.Fid.Volume;
699 tfid.Fid.Vnode = ntohl(dirEntryp->fid.vnode);
700 tfid.Fid.Unique = ntohl(dirEntryp->fid.vunique);
703 ObtainWriteLock(&afs_xvcache, 130);
704 tvcp = afs_FindVCache(&tfid, &retry, 0 /* no stats | LRU */ );
706 ReleaseWriteLock(&afs_xvcache);
709 } while (tvcp && retry);
710 if (!tvcp) { /* otherwise, create manually */
711 tvcp = afs_NewVCache(&tfid, hostp);
712 ObtainWriteLock(&tvcp->lock, 505);
713 ReleaseWriteLock(&afs_xvcache);
714 afs_RemoveVCB(&tfid);
715 ReleaseWriteLock(&tvcp->lock);
717 ReleaseWriteLock(&afs_xvcache);
720 goto done; /* can't happen at present, more's the pity */
722 #ifdef AFS_DARWIN80_ENV
723 if (tvcp->states & CVInit) {
724 /* XXX don't have status yet, so creating the vnode is
725 not yet useful. we would get CDeadVnode set, and the
726 upcoming PutVCache will cause the vcache to be flushed &
727 freed, which in turn means the bulkstatus results won't
731 /* WARNING: afs_DoBulkStat uses the Length field to store a
732 * sequence number for each bulk status request. Under no
733 * circumstances should afs_DoBulkStat store a sequence number
734 * if the new length will be ignored when afs_ProcessFS is
735 * called with new stats. */
737 if (!(tvcp->states & (CStatd | CBulkFetching))
738 && (tvcp->execsOrWriters <= 0)
739 && !afs_DirtyPages(tvcp)
740 && !AFS_VN_MAPPED((vnode_t *) tvcp))
742 if (!(tvcp->states & (CStatd | CBulkFetching))
743 && (tvcp->execsOrWriters <= 0)
744 && !afs_DirtyPages(tvcp))
748 /* this entry doesnt exist in the cache, and is not
749 * already being fetched by someone else, so add it to the
750 * list of file IDs to obtain.
752 * We detect a callback breaking race condition by checking the
753 * CBulkFetching state bit and the value in the file size.
754 * It is safe to set the status only if the CBulkFetching
755 * flag is still set and the value in the file size does
758 * Don't fetch status for dirty files. We need to
759 * preserve the value of the file size. We could
760 * flush the pages, but it wouldn't be worthwhile.
762 memcpy((char *)(fidsp + fidIndex), (char *)&tfid.Fid,
764 tvcp->states |= CBulkFetching;
765 tvcp->m.Length = statSeqNo;
771 /* if dir vnode has non-zero entry */
772 /* move to the next dir entry by adding in the # of entries
773 * used by this dir entry.
775 temp = afs_dir_NameBlobs(dirEntryp->name) << 5;
776 DRelease((struct buffer *)dirEntryp, 0);
780 } /* while loop over all dir entries */
782 /* now release the dir lock and prepare to make the bulk RPC */
783 ReleaseReadLock(&dcp->lock);
784 ReleaseReadLock(&adp->lock);
786 /* release the chunk */
789 /* dont make a null call */
794 /* setup the RPC parm structures */
795 fidParm.AFSCBFids_len = fidIndex;
796 fidParm.AFSCBFids_val = fidsp;
797 statParm.AFSBulkStats_len = fidIndex;
798 statParm.AFSBulkStats_val = statsp;
799 cbParm.AFSCBs_len = fidIndex;
800 cbParm.AFSCBs_val = cbsp;
802 /* start the timer; callback expirations are relative to this */
803 startTime = osi_Time();
805 tcp = afs_Conn(&adp->fid, areqp, SHARED_LOCK);
807 hostp = tcp->srvr->server;
808 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_BULKSTATUS);
811 if (!(tcp->srvr->server->flags & SNO_INLINEBULK)) {
813 RXAFS_InlineBulkStatus(tcp->id, &fidParm, &statParm,
815 if (code == RXGEN_OPCODE) {
816 tcp->srvr->server->flags |= SNO_INLINEBULK;
819 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm,
826 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm, &cbParm,
834 (tcp, code, &adp->fid, areqp, AFS_STATS_FS_RPCIDX_BULKSTATUS,
837 /* now, if we didnt get the info, bail out. */
841 /* we need vol flags to create the entries properly */
842 dotdot.Fid.Volume = 0;
843 volp = afs_GetVolume(&adp->fid, areqp, READ_LOCK);
845 volStates = volp->states;
846 if (volp->dotdot.Fid.Volume != 0)
847 dotdot = volp->dotdot;
851 /* find the place to merge the info into We do this by skipping
852 * nskip entries in the LRU queue. The more we skip, the more
853 * we preserve, since the head of the VLRU queue is the most recently
857 nskip = afs_cacheStats / 2; /* preserved fraction of the cache */
858 ObtainReadLock(&afs_xvcache);
860 /* actually a serious error, probably should panic. Probably will
861 * panic soon, oh well. */
862 ReleaseReadLock(&afs_xvcache);
863 afs_warnuser("afs_DoBulkStat: VLRU empty!");
866 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
867 refpanic("Bulkstat VLRU inconsistent");
869 for (tq = VLRU.next; tq != &VLRU; tq = QNext(tq)) {
872 else if (QNext(QPrev(tq)) != tq) {
874 refpanic("BulkStat VLRU inconsistent");
880 lruvcp = QTOV(VLRU.next);
882 /* now we have to hold this entry, so that it does not get moved
883 * into the free list while we're running. It could still get
884 * moved within the lru queue, but hopefully that will be rare; it
885 * doesn't hurt nearly as much.
888 osi_vnhold(lruvcp, &retry);
889 ReleaseReadLock(&afs_xvcache); /* could be read lock */
892 #ifdef AFS_DARWIN80_ENV
893 vnode_get(AFSTOV(lruvcp));
896 /* otherwise, merge in the info. We have to be quite careful here,
897 * since we need to ensure that we don't merge old info over newer
898 * stuff in a stat cache entry. We're very conservative here: we don't
899 * do the merge at all unless we ourselves create the stat cache
900 * entry. That's pretty safe, and should work pretty well, since we
901 * typically expect to do the stat cache creation ourselves.
903 * We also have to take into account racing token revocations.
905 for (i = 0; i < fidIndex; i++) {
906 if ((&statsp[i])->errorCode)
908 afid.Cell = adp->fid.Cell;
909 afid.Fid.Volume = adp->fid.Fid.Volume;
910 afid.Fid.Vnode = fidsp[i].Vnode;
911 afid.Fid.Unique = fidsp[i].Unique;
914 ObtainReadLock(&afs_xvcache);
915 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
916 ReleaseReadLock(&afs_xvcache);
917 } while (tvcp && retry);
919 /* The entry may no longer exist */
924 /* now we have the entry held, but we need to fill it in */
925 ObtainWriteLock(&tvcp->lock, 131);
927 /* if CBulkFetching is not set, or if the file size no longer
928 * matches the value we placed there when we set the CBulkFetching
929 * flag, then someone else has done something with this node,
930 * and we may not have the latest status information for this
931 * file. Leave the entry alone.
933 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
935 ReleaseWriteLock(&tvcp->lock);
940 /* now copy ".." entry back out of volume structure, if necessary */
941 if (tvcp->mvstat == 2 && (dotdot.Fid.Volume != 0)) {
943 tvcp->mvid = (struct VenusFid *)
944 osi_AllocSmallSpace(sizeof(struct VenusFid));
945 *tvcp->mvid = dotdot;
948 ObtainWriteLock(&afs_xvcache, 132);
949 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
950 refpanic("Bulkstat VLRU inconsistent2");
952 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
953 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
954 refpanic("Bulkstat VLRU inconsistent4");
956 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
957 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
958 refpanic("Bulkstat VLRU inconsistent5");
961 if (tvcp != lruvcp) { /* if they are == don't move it, don't corrupt vlru */
962 QRemove(&tvcp->vlruq);
963 QAdd(&lruvcp->vlruq, &tvcp->vlruq);
966 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
967 refpanic("Bulkstat VLRU inconsistent3");
969 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
970 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
971 refpanic("Bulkstat VLRU inconsistent5");
973 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
974 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
975 refpanic("Bulkstat VLRU inconsistent6");
977 ReleaseWriteLock(&afs_xvcache);
979 ObtainWriteLock(&afs_xcbhash, 494);
981 /* We need to check the flags again. We may have missed
982 * something while we were waiting for a lock.
984 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
986 ReleaseWriteLock(&tvcp->lock);
987 ReleaseWriteLock(&afs_xcbhash);
992 /* now merge in the resulting status back into the vnode.
993 * We only do this if the entry looks clear.
995 afs_ProcessFS(tvcp, &statsp[i], areqp);
996 #if defined(AFS_LINUX22_ENV)
997 afs_fill_inode(AFSTOV(tvcp), NULL); /* reset inode operations */
1000 /* do some accounting for bulk stats: mark this entry as
1001 * loaded, so we can tell if we use it before it gets
1004 tvcp->states |= CBulkStat;
1005 tvcp->states &= ~CBulkFetching;
1007 afs_bulkStatsDone++;
1009 /* merge in vol info */
1010 if (volStates & VRO)
1011 tvcp->states |= CRO;
1012 if (volStates & VBackup)
1013 tvcp->states |= CBackup;
1014 if (volStates & VForeign)
1015 tvcp->states |= CForeign;
1017 /* merge in the callback info */
1018 tvcp->states |= CTruth;
1020 /* get ptr to the callback we are interested in */
1023 if (tcbp->ExpirationTime != 0) {
1024 tvcp->cbExpires = tcbp->ExpirationTime + startTime;
1025 tvcp->callback = hostp;
1026 tvcp->states |= CStatd;
1027 afs_QueueCallback(tvcp, CBHash(tcbp->ExpirationTime), volp);
1028 } else if (tvcp->states & CRO) {
1029 /* ordinary callback on a read-only volume -- AFS 3.2 style */
1030 tvcp->cbExpires = 3600 + startTime;
1031 tvcp->callback = hostp;
1032 tvcp->states |= CStatd;
1033 afs_QueueCallback(tvcp, CBHash(3600), volp);
1036 tvcp->states &= ~(CStatd | CUnique);
1037 afs_DequeueCallback(tvcp);
1038 if ((tvcp->states & CForeign) || (vType(tvcp) == VDIR))
1039 osi_dnlc_purgedp(tvcp); /* if it (could be) a directory */
1041 ReleaseWriteLock(&afs_xcbhash);
1043 ReleaseWriteLock(&tvcp->lock);
1044 /* finally, we're done with the entry */
1045 afs_PutVCache(tvcp);
1046 } /* for all files we got back */
1048 /* finally return the pointer into the LRU queue */
1049 afs_PutVCache(lruvcp);
1052 /* Be sure to turn off the CBulkFetching flags */
1053 for (i = flagIndex; i < fidIndex; i++) {
1054 afid.Cell = adp->fid.Cell;
1055 afid.Fid.Volume = adp->fid.Fid.Volume;
1056 afid.Fid.Vnode = fidsp[i].Vnode;
1057 afid.Fid.Unique = fidsp[i].Unique;
1060 ObtainReadLock(&afs_xvcache);
1061 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
1062 ReleaseReadLock(&afs_xvcache);
1063 } while (tvcp && retry);
1064 if (tvcp != NULL && (tvcp->states & CBulkFetching)
1065 && (tvcp->m.Length == statSeqNo)) {
1066 tvcp->states &= ~CBulkFetching;
1069 afs_PutVCache(tvcp);
1073 afs_PutVolume(volp, READ_LOCK);
1075 /* If we did the InlineBulk RPC pull out the return code */
1077 if ((&statsp[0])->errorCode) {
1078 afs_Analyze(tcp, (&statsp[0])->errorCode, &adp->fid, areqp,
1079 AFS_STATS_FS_RPCIDX_BULKSTATUS, SHARED_LOCK, NULL);
1080 code = (&statsp[0])->errorCode;
1086 osi_FreeLargeSpace(statMemp);
1087 osi_FreeLargeSpace(cbfMemp);
1091 /* was: (AFS_DEC_ENV) || defined(AFS_OSF30_ENV) || defined(AFS_NCR_ENV) */
1092 #ifdef AFS_DARWIN80_ENV
1095 static int AFSDOBULK = 1;
1100 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred, int opflag, int wantparent)
1101 #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
1102 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct pathname *pnp, int flags, struct vnode *rdir, struct AFS_UCRED *acred)
1103 #elif defined(UKERNEL)
1104 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred, int flags)
1106 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred)
1109 struct vrequest treq;
1111 register struct vcache *tvc = 0;
1112 register afs_int32 code;
1113 register afs_int32 bulkcode = 0;
1114 int pass = 0, hit = 0;
1116 extern afs_int32 afs_mariner; /*Writing activity to log? */
1117 afs_hyper_t versionNo;
1118 int no_read_access = 0;
1119 struct sysname_info sysState; /* used only for @sys checking */
1120 int dynrootRetry = 1;
1121 struct afs_fakestat_state fakestate;
1122 int tryEvalOnly = 0;
1123 OSI_VC_CONVERT(adp);
1125 AFS_STATCNT(afs_lookup);
1126 afs_InitFakeStat(&fakestate);
1128 if ((code = afs_InitReq(&treq, acred)))
1132 ndp->ni_dvp = AFSTOV(adp);
1133 #endif /* AFS_OSF_ENV */
1135 #if defined(AFS_DARWIN_ENV)
1136 /* Workaround for MacOSX Finder, which tries to look for
1137 * .DS_Store and Contents under every directory.
1139 if (afs_fakestat_enable && adp->mvstat == 1) {
1140 if (strcmp(aname, ".DS_Store") == 0)
1142 if (strcmp(aname, "Contents") == 0)
1148 code = afs_TryEvalFakeStat(&adp, &fakestate, &treq);
1150 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
1151 if (tryEvalOnly && adp->mvstat == 1)
1156 *avcp = NULL; /* Since some callers don't initialize it */
1158 /* come back to here if we encounter a non-existent object in a read-only
1159 * volume's directory */
1162 *avcp = NULL; /* Since some callers don't initialize it */
1165 if (!(adp->states & CStatd)) {
1166 if ((code = afs_VerifyVCache2(adp, &treq))) {
1172 /* watch for ".." in a volume root */
1173 if (adp->mvstat == 2 && aname[0] == '.' && aname[1] == '.' && !aname[2]) {
1174 /* looking up ".." in root via special hacks */
1175 if (adp->mvid == (struct VenusFid *)0 || adp->mvid->Fid.Volume == 0) {
1177 extern struct vcache *afs_globalVp;
1178 if (adp == afs_globalVp) {
1179 struct vnode *rvp = AFSTOV(adp);
1181 ndp->ni_vp = rvp->v_vfsp->vfs_vnodecovered;
1182 ndp->ni_dvp = ndp->ni_vp;
1192 /* otherwise we have the fid here, so we use it */
1193 tvc = afs_GetVCache(adp->mvid, &treq, NULL, NULL);
1194 afs_Trace3(afs_iclSetp, CM_TRACE_GETVCDOTDOT, ICL_TYPE_FID, adp->mvid,
1195 ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32, code);
1197 code = (tvc ? 0 : ENOENT);
1199 if (tvc && !VREFCOUNT_GT(tvc, 0)) {
1203 /*printf("LOOKUP GETVCDOTDOT -> %d\n", code); */
1208 /* now check the access */
1209 if (treq.uid != adp->last_looker) {
1210 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
1215 adp->last_looker = treq.uid;
1218 /* Check for read access as well. We need read access in order to
1219 * stat files, but not to stat subdirectories. */
1220 if (!afs_AccessOK(adp, PRSFS_READ, &treq, CHECK_MODE_BITS))
1223 /* special case lookup of ".". Can we check for it sooner in this code,
1224 * for instance, way up before "redo:" ??
1225 * I'm not fiddling with the LRUQ here, either, perhaps I should, or else
1226 * invent a lightweight version of GetVCache.
1228 if (aname[0] == '.' && !aname[1]) { /* special case */
1229 ObtainReadLock(&afs_xvcache);
1231 ReleaseReadLock(&afs_xvcache);
1232 #ifdef AFS_DARWIN80_ENV
1233 vnode_get(AFSTOV(adp));
1238 if (adp && !VREFCOUNT_GT(adp, 0)) {
1244 Check_AtSys(adp, aname, &sysState, &treq);
1245 tname = sysState.name;
1247 /* 1st Check_AtSys and lookup by tname is required here, for now,
1248 * because the dnlc is *not* told to remove entries for the parent
1249 * dir of file/dir op that afs_LocalHero likes, but dnlc is informed
1250 * if the cached entry for the parent dir is invalidated for a
1252 * Otherwise, we'd be able to do a dnlc lookup on an entry ending
1253 * w/@sys and know the dnlc was consistent with reality. */
1254 tvc = osi_dnlc_lookup(adp, tname, WRITE_LOCK);
1255 *avcp = tvc; /* maybe wasn't initialized, but it is now */
1257 if (no_read_access && vType(tvc) != VDIR && vType(tvc) != VLNK) {
1258 /* need read access on dir to stat non-directory / non-link */
1264 #ifdef AFS_LINUX22_ENV
1265 if (tvc->mvstat == 2) { /* we don't trust the dnlc for root vcaches */
1266 AFS_RELE(AFSTOV(tvc));
1273 #else /* non - LINUX */
1277 #endif /* linux22 */
1280 { /* sub-block just to reduce stack usage */
1281 register struct dcache *tdc;
1282 afs_size_t dirOffset, dirLen;
1283 struct VenusFid tfid;
1285 /* now we have to lookup the next fid */
1287 afs_GetDCache(adp, (afs_size_t) 0, &treq, &dirOffset, &dirLen, 1);
1289 *avcp = NULL; /* redundant, but harmless */
1294 /* now we will just call dir package with appropriate inode.
1295 * Dirs are always fetched in their entirety for now */
1296 ObtainReadLock(&adp->lock);
1297 ObtainReadLock(&tdc->lock);
1300 * Make sure that the data in the cache is current. There are two
1301 * cases we need to worry about:
1302 * 1. The cache data is being fetched by another process.
1303 * 2. The cache data is no longer valid
1305 while ((adp->states & CStatd)
1306 && (tdc->dflags & DFFetching)
1307 && hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1308 ReleaseReadLock(&tdc->lock);
1309 ReleaseReadLock(&adp->lock);
1310 afs_osi_Sleep(&tdc->validPos);
1311 ObtainReadLock(&adp->lock);
1312 ObtainReadLock(&tdc->lock);
1314 if (!(adp->states & CStatd)
1315 || !hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1316 ReleaseReadLock(&tdc->lock);
1317 ReleaseReadLock(&adp->lock);
1319 if (tname && tname != aname)
1320 osi_FreeLargeSpace(tname);
1324 /* Save the version number for when we call osi_dnlc_enter */
1325 hset(versionNo, tdc->f.versionNo);
1328 * check for, and handle "@sys" if it's there. We should be able
1329 * to avoid the alloc and the strcpy with a little work, but it's
1330 * not pressing. If there aren't any remote users (ie, via the
1331 * NFS translator), we have a slightly easier job.
1332 * the faster way to do this is to check for *aname == '@' and if
1333 * it's there, check for @sys, otherwise, assume there's no @sys
1334 * then, if the lookup fails, check for .*@sys...
1336 /* above now implemented by Check_AtSys and Next_AtSys */
1338 /* lookup the name in the appropriate dir, and return a cache entry
1339 * on the resulting fid */
1341 afs_dir_LookupOffset(tdc, sysState.name, &tfid.Fid,
1344 /* If the first lookup doesn't succeed, maybe it's got @sys in the name */
1345 while (code == ENOENT && Next_AtSys(adp, &treq, &sysState))
1347 afs_dir_LookupOffset(tdc, sysState.name, &tfid.Fid,
1349 tname = sysState.name;
1351 ReleaseReadLock(&tdc->lock);
1354 if (code == ENOENT && afs_IsDynroot(adp) && dynrootRetry) {
1355 ReleaseReadLock(&adp->lock);
1357 if (tname[0] == '.')
1358 afs_LookupAFSDB(tname + 1);
1360 afs_LookupAFSDB(tname);
1361 if (tname && tname != aname)
1362 osi_FreeLargeSpace(tname);
1365 ReleaseReadLock(&adp->lock);
1368 /* new fid has same cell and volume */
1369 tfid.Cell = adp->fid.Cell;
1370 tfid.Fid.Volume = adp->fid.Fid.Volume;
1371 afs_Trace4(afs_iclSetp, CM_TRACE_LOOKUP, ICL_TYPE_POINTER, adp,
1372 ICL_TYPE_STRING, tname, ICL_TYPE_FID, &tfid,
1373 ICL_TYPE_INT32, code);
1376 if (code != ENOENT) {
1377 printf("LOOKUP dirLookupOff -> %d\n", code);
1382 /* prefetch some entries, if the dir is currently open. The variable
1383 * dirCookie tells us where to start prefetching from.
1385 if (AFSDOBULK && adp->opens > 0 && !(adp->states & CForeign)
1386 && !afs_IsDynroot(adp)) {
1388 /* if the entry is not in the cache, or is in the cache,
1389 * but hasn't been statd, then do a bulk stat operation.
1393 ObtainReadLock(&afs_xvcache);
1394 tvc = afs_FindVCache(&tfid, &retry, 0 /* !stats,!lru */ );
1395 ReleaseReadLock(&afs_xvcache);
1396 } while (tvc && retry);
1398 if (!tvc || !(tvc->states & CStatd))
1399 bulkcode = afs_DoBulkStat(adp, dirCookie, &treq);
1403 /* if the vcache isn't usable, release it */
1404 if (tvc && !(tvc->states & CStatd)) {
1413 /* now get the status info, if we don't already have it */
1414 /* This is kind of weird, but we might wind up accidentally calling
1415 * RXAFS_Lookup because we happened upon a file which legitimately
1416 * has a 0 uniquifier. That is the result of allowing unique to wrap
1417 * to 0. This was fixed in AFS 3.4. For CForeign, Unique == 0 means that
1418 * the file has not yet been looked up.
1421 afs_int32 cached = 0;
1422 if (!tfid.Fid.Unique && (adp->states & CForeign)) {
1423 tvc = afs_LookupVCache(&tfid, &treq, &cached, adp, tname);
1425 if (!tvc && !bulkcode) { /* lookup failed or wasn't called */
1426 tvc = afs_GetVCache(&tfid, &treq, &cached, NULL);
1429 } /* sub-block just to reduce stack usage */
1432 int force_eval = afs_fakestat_enable ? 0 : 1;
1434 if (adp->states & CForeign)
1435 tvc->states |= CForeign;
1436 tvc->parentVnode = adp->fid.Fid.Vnode;
1437 tvc->parentUnique = adp->fid.Fid.Unique;
1438 tvc->states &= ~CBulkStat;
1440 if (afs_fakestat_enable == 2 && tvc->mvstat == 1) {
1441 ObtainSharedLock(&tvc->lock, 680);
1442 if (!tvc->linkData) {
1443 UpgradeSToWLock(&tvc->lock, 681);
1444 code = afs_HandleLink(tvc, &treq);
1445 ConvertWToRLock(&tvc->lock);
1447 ConvertSToRLock(&tvc->lock);
1450 if (!code && !afs_strchr(tvc->linkData, ':'))
1452 ReleaseReadLock(&tvc->lock);
1454 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1455 if (!(flags & AFS_LOOKUP_NOEVAL))
1456 /* don't eval mount points */
1457 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1458 if (tvc->mvstat == 1 && force_eval) {
1459 /* a mt point, possibly unevaluated */
1460 struct volume *tvolp;
1462 ObtainWriteLock(&tvc->lock, 133);
1463 code = EvalMountPoint(tvc, adp, &tvolp, &treq);
1464 ReleaseWriteLock(&tvc->lock);
1469 afs_PutVolume(tvolp, WRITE_LOCK);
1473 /* next, we want to continue using the target of the mt point */
1474 if (tvc->mvid && (tvc->states & CMValid)) {
1476 /* now lookup target, to set .. pointer */
1477 afs_Trace2(afs_iclSetp, CM_TRACE_LOOKUP1,
1478 ICL_TYPE_POINTER, tvc, ICL_TYPE_FID,
1480 uvc = tvc; /* remember for later */
1482 if (tvolp && (tvolp->states & VForeign)) {
1483 /* XXXX tvolp has ref cnt on but not locked! XXX */
1485 afs_GetRootVCache(tvc->mvid, &treq, NULL, tvolp);
1487 tvc = afs_GetVCache(tvc->mvid, &treq, NULL, NULL);
1489 afs_PutVCache(uvc); /* we're done with it */
1494 afs_PutVolume(tvolp, WRITE_LOCK);
1499 /* now, if we came via a new mt pt (say because of a new
1500 * release of a R/O volume), we must reevaluate the ..
1501 * ptr to point back to the appropriate place */
1503 ObtainWriteLock(&tvc->lock, 134);
1504 if (tvc->mvid == NULL) {
1505 tvc->mvid = (struct VenusFid *)
1506 osi_AllocSmallSpace(sizeof(struct VenusFid));
1508 /* setup backpointer */
1509 *tvc->mvid = tvolp->dotdot;
1510 ReleaseWriteLock(&tvc->lock);
1511 afs_PutVolume(tvolp, WRITE_LOCK);
1517 afs_PutVolume(tvolp, WRITE_LOCK);
1522 if (tvc && !VREFCOUNT_GT(tvc, 0)) {
1527 /* if we get here, we found something in a directory that couldn't
1528 * be located (a Multics "connection failure"). If the volume is
1529 * read-only, we try flushing this entry from the cache and trying
1533 tv = afs_GetVolume(&adp->fid, &treq, READ_LOCK);
1535 if (tv->states & VRO) {
1536 pass = 1; /* try this *once* */
1537 ObtainWriteLock(&afs_xcbhash, 495);
1538 afs_DequeueCallback(adp);
1539 /* re-stat to get later version */
1540 adp->states &= ~CStatd;
1541 ReleaseWriteLock(&afs_xcbhash);
1542 osi_dnlc_purgedp(adp);
1543 afs_PutVolume(tv, READ_LOCK);
1546 afs_PutVolume(tv, READ_LOCK);
1553 /* put the network buffer back, if need be */
1554 if (tname != aname && tname)
1555 osi_FreeLargeSpace(tname);
1558 /* Handle RENAME; only need to check rename "." */
1559 if (opflag == RENAME && wantparent && *ndp->ni_next == 0) {
1560 if (!FidCmp(&(tvc->fid), &(adp->fid))) {
1561 afs_PutVCache(*avcp);
1563 afs_PutFakeStat(&fakestate);
1564 return afs_CheckCode(EISDIR, &treq, 18);
1567 #endif /* AFS_OSF_ENV */
1570 afs_AddMarinerName(aname, tvc);
1572 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1573 if (!(flags & AFS_LOOKUP_NOEVAL))
1574 /* Here we don't enter the name into the DNLC because we want the
1575 * evaluated mount dir to be there (the vcache for the mounted volume)
1576 * rather than the vc of the mount point itself. we can still find the
1577 * mount point's vc in the vcache by its fid. */
1578 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1580 osi_dnlc_enter(adp, aname, tvc, &versionNo);
1582 #ifdef AFS_LINUX20_ENV
1583 /* So Linux inode cache is up to date. */
1584 code = afs_VerifyVCache(tvc, &treq);
1586 afs_PutFakeStat(&fakestate);
1587 return 0; /* can't have been any errors if hit and !code */
1594 code = afs_CheckCode(code, &treq, 19);
1596 /* If there is an error, make sure *avcp is null.
1597 * Alphas panic otherwise - defect 10719.
1602 afs_PutFakeStat(&fakestate);