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,
405 register char *bufp, int *num, char **sysnamelist[])
407 register struct unixuser *au;
408 register afs_int32 error;
410 AFS_STATCNT(getsysname);
412 *sysnamelist = afs_sysnamelist;
414 if (!afs_nfsexporter)
415 strcpy(bufp, (*sysnamelist)[0]);
417 au = afs_GetUser(areq->uid, adp->fid.Cell, 0);
419 error = EXP_SYSNAME(au->exporter, (char *)0, sysnamelist, num);
421 strcpy(bufp, "@sys");
425 strcpy(bufp, (*sysnamelist)[0]);
428 strcpy(bufp, afs_sysname);
435 Check_AtSys(register struct vcache *avc, char *aname,
436 struct sysname_info *state, struct vrequest *areq)
439 char **sysnamelist[MAXSYSNAME];
441 if (AFS_EQ_ATSYS(aname)) {
443 state->name = (char *)osi_AllocLargeSpace(AFS_SMALLOCSIZ);
446 afs_getsysname(areq, avc, state->name, &num, sysnamelist);
456 Next_AtSys(register struct vcache *avc, struct vrequest *areq,
457 struct sysname_info *state)
459 int num = afs_sysnamecount;
460 char **sysnamelist[MAXSYSNAME];
462 if (state->index == -1)
463 return 0; /* No list */
465 /* Check for the initial state of aname != "@sys" in Check_AtSys */
466 if (state->offset == -1 && state->allocked == 0) {
467 register char *tname;
469 /* Check for .*@sys */
470 for (tname = state->name; *tname; tname++)
471 /*Move to the end of the string */ ;
473 if ((tname > state->name + 4) && (AFS_EQ_ATSYS(tname - 4))) {
474 state->offset = (tname - 4) - state->name;
475 tname = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
476 strncpy(tname, state->name, state->offset);
481 afs_getsysname(areq, avc, state->name + state->offset, &num,
485 return 0; /* .*@sys doesn't match either */
487 register struct unixuser *au;
488 register afs_int32 error;
490 *sysnamelist = afs_sysnamelist;
492 if (afs_nfsexporter) {
493 au = afs_GetUser(areq->uid, avc->fid.Cell, 0);
496 EXP_SYSNAME(au->exporter, (char *)0, sysnamelist, num);
503 if (++(state->index) >= num || !(*sysnamelist)[state->index])
504 return 0; /* end of list */
506 strcpy(state->name + state->offset, (*sysnamelist)[state->index]);
510 #if (defined(AFS_SGI62_ENV) || defined(AFS_SUN57_64BIT_ENV))
511 extern int BlobScan(ino64_t * afile, afs_int32 ablob);
513 #if defined(AFS_HPUX1123_ENV)
514 /* DEE should use the new afs_inode_t for all */
515 extern int BlobScan(ino_t * afile, afs_int32 ablob);
517 #if defined AFS_LINUX_64BIT_KERNEL
518 extern int BlobScan(long *afile, afs_int32 ablob);
520 extern int BlobScan(afs_int32 * afile, afs_int32 ablob);
526 /* called with an unlocked directory and directory cookie. Areqp
527 * describes who is making the call.
528 * Scans the next N (about 30, typically) directory entries, and does
529 * a bulk stat call to stat them all.
531 * Must be very careful when merging in RPC responses, since we dont
532 * want to overwrite newer info that was added by a file system mutating
533 * call that ran concurrently with our bulk stat call.
535 * We do that, as described below, by not merging in our info (always
536 * safe to skip the merge) if the status info is valid in the vcache entry.
538 * If adapt ever implements the bulk stat RPC, then this code will need to
539 * ensure that vcaches created for failed RPC's to older servers have the
542 static struct vcache *BStvc = NULL;
545 afs_DoBulkStat(struct vcache *adp, long dirCookie, struct vrequest *areqp)
547 int nentries; /* # of entries to prefetch */
548 int nskip; /* # of slots in the LRU queue to skip */
549 struct vcache *lruvcp; /* vcache ptr of our goal pos in LRU queue */
550 struct dcache *dcp; /* chunk containing the dir block */
551 char *statMemp; /* status memory block */
552 char *cbfMemp; /* callback and fid memory block */
553 afs_size_t temp; /* temp for holding chunk length, &c. */
554 struct AFSFid *fidsp; /* file IDs were collecting */
555 struct AFSCallBack *cbsp; /* call back pointers */
556 struct AFSCallBack *tcbp; /* temp callback ptr */
557 struct AFSFetchStatus *statsp; /* file status info */
558 struct AFSVolSync volSync; /* vol sync return info */
559 struct vcache *tvcp; /* temp vcp */
560 struct afs_q *tq; /* temp queue variable */
561 AFSCBFids fidParm; /* file ID parm for bulk stat */
562 AFSBulkStats statParm; /* stat info parm for bulk stat */
563 int fidIndex; /* which file were stating */
564 struct conn *tcp; /* conn for call */
565 AFSCBs cbParm; /* callback parm for bulk stat */
566 struct server *hostp = 0; /* host we got callback from */
567 long startTime; /* time we started the call,
568 * for callback expiration base
570 afs_size_t statSeqNo; /* Valued of file size to detect races */
571 int code; /* error code */
572 long newIndex; /* new index in the dir */
573 struct DirEntry *dirEntryp; /* dir entry we are examining */
575 struct VenusFid afid; /* file ID we are using now */
576 struct VenusFid tfid; /* another temp. file ID */
577 afs_int32 retry; /* handle low-level SGI MP race conditions */
578 long volStates; /* flags from vol structure */
579 struct volume *volp = 0; /* volume ptr */
580 struct VenusFid dotdot;
581 int flagIndex; /* First file with bulk fetch flag set */
582 int inlinebulk = 0; /* Did we use InlineBulk RPC or not? */
584 /* first compute some basic parameters. We dont want to prefetch more
585 * than a fraction of the cache in any given call, and we want to preserve
586 * a portion of the LRU queue in any event, so as to avoid thrashing
587 * the entire stat cache (we will at least leave some of it alone).
588 * presently dont stat more than 1/8 the cache in any one call. */
589 nentries = afs_cacheStats / 8;
591 /* dont bother prefetching more than one calls worth of info */
592 if (nentries > AFSCBMAX)
595 /* heuristic to make sure that things fit in 4K. This means that
596 * we shouldnt make it any bigger than 47 entries. I am typically
597 * going to keep it a little lower, since we don't want to load
598 * too much of the stat cache.
603 /* now, to reduce the stack size, well allocate two 4K blocks,
604 * one for fids and callbacks, and one for stat info. Well set
605 * up our pointers to the memory from there, too.
607 statMemp = osi_AllocLargeSpace(nentries * sizeof(AFSFetchStatus));
608 statsp = (struct AFSFetchStatus *)statMemp;
610 osi_AllocLargeSpace(nentries *
611 (sizeof(AFSCallBack) + sizeof(AFSFid)));
612 fidsp = (AFSFid *) cbfMemp;
613 cbsp = (AFSCallBack *) (cbfMemp + nentries * sizeof(AFSFid));
615 /* next, we must iterate over the directory, starting from the specified
616 * cookie offset (dirCookie), and counting out nentries file entries.
617 * We skip files that already have stat cache entries, since we
618 * dont want to bulk stat files that are already in the cache.
621 code = afs_VerifyVCache(adp, areqp);
625 dcp = afs_GetDCache(adp, (afs_size_t) 0, areqp, &temp, &temp, 1);
631 /* lock the directory cache entry */
632 ObtainReadLock(&adp->lock);
633 ObtainReadLock(&dcp->lock);
636 * Make sure that the data in the cache is current. There are two
637 * cases we need to worry about:
638 * 1. The cache data is being fetched by another process.
639 * 2. The cache data is no longer valid
641 while ((adp->states & CStatd)
642 && (dcp->dflags & DFFetching)
643 && hsame(adp->m.DataVersion, dcp->f.versionNo)) {
644 afs_Trace4(afs_iclSetp, CM_TRACE_DCACHEWAIT, ICL_TYPE_STRING,
645 __FILE__, ICL_TYPE_INT32, __LINE__, ICL_TYPE_POINTER, dcp,
646 ICL_TYPE_INT32, dcp->dflags);
647 ReleaseReadLock(&dcp->lock);
648 ReleaseReadLock(&adp->lock);
649 afs_osi_Sleep(&dcp->validPos);
650 ObtainReadLock(&adp->lock);
651 ObtainReadLock(&dcp->lock);
653 if (!(adp->states & CStatd)
654 || !hsame(adp->m.DataVersion, dcp->f.versionNo)) {
655 ReleaseReadLock(&dcp->lock);
656 ReleaseReadLock(&adp->lock);
661 /* Generate a sequence number so we can tell whether we should
662 * store the attributes when processing the response. This number is
663 * stored in the file size when we set the CBulkFetching bit. If the
664 * CBulkFetching is still set and this value hasn't changed, then
665 * we know we were the last to set CBulkFetching bit for this file,
666 * and it is safe to set the status information for this file.
668 statSeqNo = bulkStatCounter++;
670 /* now we have dir data in the cache, so scan the dir page */
673 while (1) { /* Should probably have some constant bound */
674 /* look for first safe entry to examine in the directory. BlobScan
675 * looks for a the 1st allocated dir after the dirCookie slot.
677 newIndex = BlobScan(&dcp->f.inode, (dirCookie >> 5));
681 /* remember the updated directory cookie */
682 dirCookie = newIndex << 5;
684 /* get a ptr to the dir entry */
686 (struct DirEntry *)afs_dir_GetBlob(&dcp->f.inode, newIndex);
690 /* dont copy more than we have room for */
691 if (fidIndex >= nentries) {
692 DRelease((struct buffer *)dirEntryp, 0);
696 /* now, if the dir entry looks good, copy it out to our list. Vnode
697 * 0 means deleted, although it should also be free were it deleted.
699 if (dirEntryp->fid.vnode != 0) {
700 /* dont copy entries we have in our cache. This check will
701 * also make us skip "." and probably "..", unless it has
702 * disappeared from the cache since we did our namei call.
704 tfid.Cell = adp->fid.Cell;
705 tfid.Fid.Volume = adp->fid.Fid.Volume;
706 tfid.Fid.Vnode = ntohl(dirEntryp->fid.vnode);
707 tfid.Fid.Unique = ntohl(dirEntryp->fid.vunique);
710 ObtainWriteLock(&afs_xvcache, 130);
711 tvcp = afs_FindVCache(&tfid, &retry, 0 /* no stats | LRU */ );
713 ReleaseWriteLock(&afs_xvcache);
716 } while (tvcp && retry);
717 if (!tvcp) { /* otherwise, create manually */
718 tvcp = afs_NewVCache(&tfid, hostp);
719 ObtainWriteLock(&tvcp->lock, 505);
720 ReleaseWriteLock(&afs_xvcache);
721 afs_RemoveVCB(&tfid);
722 ReleaseWriteLock(&tvcp->lock);
724 ReleaseWriteLock(&afs_xvcache);
727 goto done; /* can't happen at present, more's the pity */
729 /* WARNING: afs_DoBulkStat uses the Length field to store a
730 * sequence number for each bulk status request. Under no
731 * circumstances should afs_DoBulkStat store a sequence number
732 * if the new length will be ignored when afs_ProcessFS is
733 * called with new stats. */
735 if (!(tvcp->states & (CStatd | CBulkFetching))
736 && (tvcp->execsOrWriters <= 0)
737 && !afs_DirtyPages(tvcp)
738 && !AFS_VN_MAPPED((vnode_t *) tvcp))
740 if (!(tvcp->states & (CStatd | CBulkFetching))
741 && (tvcp->execsOrWriters <= 0)
742 && !afs_DirtyPages(tvcp))
746 /* this entry doesnt exist in the cache, and is not
747 * already being fetched by someone else, so add it to the
748 * list of file IDs to obtain.
750 * We detect a callback breaking race condition by checking the
751 * CBulkFetching state bit and the value in the file size.
752 * It is safe to set the status only if the CBulkFetching
753 * flag is still set and the value in the file size does
756 * Don't fetch status for dirty files. We need to
757 * preserve the value of the file size. We could
758 * flush the pages, but it wouldn't be worthwhile.
760 memcpy((char *)(fidsp + fidIndex), (char *)&tfid.Fid,
762 tvcp->states |= CBulkFetching;
763 tvcp->m.Length = statSeqNo;
769 /* if dir vnode has non-zero entry */
770 /* move to the next dir entry by adding in the # of entries
771 * used by this dir entry.
773 temp = afs_dir_NameBlobs(dirEntryp->name) << 5;
774 DRelease((struct buffer *)dirEntryp, 0);
778 } /* while loop over all dir entries */
780 /* now release the dir lock and prepare to make the bulk RPC */
781 ReleaseReadLock(&dcp->lock);
782 ReleaseReadLock(&adp->lock);
784 /* release the chunk */
787 /* dont make a null call */
792 /* setup the RPC parm structures */
793 fidParm.AFSCBFids_len = fidIndex;
794 fidParm.AFSCBFids_val = fidsp;
795 statParm.AFSBulkStats_len = fidIndex;
796 statParm.AFSBulkStats_val = statsp;
797 cbParm.AFSCBs_len = fidIndex;
798 cbParm.AFSCBs_val = cbsp;
800 /* start the timer; callback expirations are relative to this */
801 startTime = osi_Time();
803 tcp = afs_Conn(&adp->fid, areqp, SHARED_LOCK);
805 hostp = tcp->srvr->server;
806 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_BULKSTATUS);
809 if (!(tcp->srvr->server->flags & SNO_INLINEBULK)) {
811 RXAFS_InlineBulkStatus(tcp->id, &fidParm, &statParm,
813 if (code == RXGEN_OPCODE) {
814 tcp->srvr->server->flags |= SNO_INLINEBULK;
817 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm,
824 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm, &cbParm,
832 (tcp, code, &adp->fid, areqp, AFS_STATS_FS_RPCIDX_BULKSTATUS,
835 /* now, if we didnt get the info, bail out. */
839 /* we need vol flags to create the entries properly */
840 dotdot.Fid.Volume = 0;
841 volp = afs_GetVolume(&adp->fid, areqp, READ_LOCK);
843 volStates = volp->states;
844 if (volp->dotdot.Fid.Volume != 0)
845 dotdot = volp->dotdot;
849 /* find the place to merge the info into We do this by skipping
850 * nskip entries in the LRU queue. The more we skip, the more
851 * we preserve, since the head of the VLRU queue is the most recently
855 nskip = afs_cacheStats / 2; /* preserved fraction of the cache */
856 ObtainReadLock(&afs_xvcache);
858 /* actually a serious error, probably should panic. Probably will
859 * panic soon, oh well. */
860 ReleaseReadLock(&afs_xvcache);
861 afs_warnuser("afs_DoBulkStat: VLRU empty!");
864 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
865 refpanic("Bulkstat VLRU inconsistent");
867 for (tq = VLRU.next; tq != &VLRU; tq = QNext(tq)) {
870 else if (QNext(QPrev(tq)) != tq) {
872 refpanic("BulkStat VLRU inconsistent");
878 lruvcp = QTOV(VLRU.next);
880 /* now we have to hold this entry, so that it does not get moved
881 * into the free list while we're running. It could still get
882 * moved within the lru queue, but hopefully that will be rare; it
883 * doesn't hurt nearly as much.
886 osi_vnhold(lruvcp, &retry);
887 ReleaseReadLock(&afs_xvcache); /* could be read lock */
891 /* otherwise, merge in the info. We have to be quite careful here,
892 * since we need to ensure that we don't merge old info over newer
893 * stuff in a stat cache entry. We're very conservative here: we don't
894 * do the merge at all unless we ourselves create the stat cache
895 * entry. That's pretty safe, and should work pretty well, since we
896 * typically expect to do the stat cache creation ourselves.
898 * We also have to take into account racing token revocations.
900 for (i = 0; i < fidIndex; i++) {
901 if ((&statsp[i])->errorCode)
903 afid.Cell = adp->fid.Cell;
904 afid.Fid.Volume = adp->fid.Fid.Volume;
905 afid.Fid.Vnode = fidsp[i].Vnode;
906 afid.Fid.Unique = fidsp[i].Unique;
909 ObtainReadLock(&afs_xvcache);
910 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
911 ReleaseReadLock(&afs_xvcache);
912 } while (tvcp && retry);
914 /* The entry may no longer exist */
919 /* now we have the entry held, but we need to fill it in */
920 ObtainWriteLock(&tvcp->lock, 131);
922 /* if CBulkFetching is not set, or if the file size no longer
923 * matches the value we placed there when we set the CBulkFetching
924 * flag, then someone else has done something with this node,
925 * and we may not have the latest status information for this
926 * file. Leave the entry alone.
928 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
930 ReleaseWriteLock(&tvcp->lock);
935 /* now copy ".." entry back out of volume structure, if necessary */
936 if (tvcp->mvstat == 2 && (dotdot.Fid.Volume != 0)) {
938 tvcp->mvid = (struct VenusFid *)
939 osi_AllocSmallSpace(sizeof(struct VenusFid));
940 *tvcp->mvid = dotdot;
943 ObtainWriteLock(&afs_xvcache, 132);
944 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
945 refpanic("Bulkstat VLRU inconsistent2");
947 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
948 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
949 refpanic("Bulkstat VLRU inconsistent4");
951 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
952 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
953 refpanic("Bulkstat VLRU inconsistent5");
956 if (tvcp != lruvcp) { /* if they are == don't move it, don't corrupt vlru */
957 QRemove(&tvcp->vlruq);
958 QAdd(&lruvcp->vlruq, &tvcp->vlruq);
961 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
962 refpanic("Bulkstat VLRU inconsistent3");
964 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
965 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
966 refpanic("Bulkstat VLRU inconsistent5");
968 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
969 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
970 refpanic("Bulkstat VLRU inconsistent6");
972 ReleaseWriteLock(&afs_xvcache);
974 ObtainWriteLock(&afs_xcbhash, 494);
976 /* We need to check the flags again. We may have missed
977 * something while we were waiting for a lock.
979 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
981 ReleaseWriteLock(&tvcp->lock);
982 ReleaseWriteLock(&afs_xcbhash);
987 /* now merge in the resulting status back into the vnode.
988 * We only do this if the entry looks clear.
990 afs_ProcessFS(tvcp, &statsp[i], areqp);
991 #ifdef AFS_LINUX22_ENV
992 /* overwrite the ops if it's a directory or symlink. */
993 if (vType(tvcp) == VDIR)
994 tvcp->v.v_op = &afs_dir_iops;
995 else if (vType(tvcp) == VLNK)
996 tvcp->v.v_op = &afs_symlink_iops;
999 /* do some accounting for bulk stats: mark this entry as
1000 * loaded, so we can tell if we use it before it gets
1003 tvcp->states |= CBulkStat;
1004 tvcp->states &= ~CBulkFetching;
1006 afs_bulkStatsDone++;
1008 /* merge in vol info */
1009 if (volStates & VRO)
1010 tvcp->states |= CRO;
1011 if (volStates & VBackup)
1012 tvcp->states |= CBackup;
1013 if (volStates & VForeign)
1014 tvcp->states |= CForeign;
1016 /* merge in the callback info */
1017 tvcp->states |= CTruth;
1019 /* get ptr to the callback we are interested in */
1022 if (tcbp->ExpirationTime != 0) {
1023 tvcp->cbExpires = tcbp->ExpirationTime + startTime;
1024 tvcp->callback = hostp;
1025 tvcp->states |= CStatd;
1026 afs_QueueCallback(tvcp, CBHash(tcbp->ExpirationTime), volp);
1027 } else if (tvcp->states & CRO) {
1028 /* ordinary callback on a read-only volume -- AFS 3.2 style */
1029 tvcp->cbExpires = 3600 + startTime;
1030 tvcp->callback = hostp;
1031 tvcp->states |= CStatd;
1032 afs_QueueCallback(tvcp, CBHash(3600), volp);
1035 tvcp->states &= ~(CStatd | CUnique);
1036 afs_DequeueCallback(tvcp);
1037 if ((tvcp->states & CForeign) || (vType(tvcp) == VDIR))
1038 osi_dnlc_purgedp(tvcp); /* if it (could be) a directory */
1040 ReleaseWriteLock(&afs_xcbhash);
1042 ReleaseWriteLock(&tvcp->lock);
1043 /* finally, we're done with the entry */
1044 afs_PutVCache(tvcp);
1045 } /* for all files we got back */
1047 /* finally return the pointer into the LRU queue */
1048 afs_PutVCache(lruvcp);
1051 /* Be sure to turn off the CBulkFetching flags */
1052 for (i = flagIndex; i < fidIndex; i++) {
1053 afid.Cell = adp->fid.Cell;
1054 afid.Fid.Volume = adp->fid.Fid.Volume;
1055 afid.Fid.Vnode = fidsp[i].Vnode;
1056 afid.Fid.Unique = fidsp[i].Unique;
1059 ObtainReadLock(&afs_xvcache);
1060 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
1061 ReleaseReadLock(&afs_xvcache);
1062 } while (tvcp && retry);
1063 if (tvcp != NULL && (tvcp->states & CBulkFetching)
1064 && (tvcp->m.Length == statSeqNo)) {
1065 tvcp->states &= ~CBulkFetching;
1068 afs_PutVCache(tvcp);
1072 afs_PutVolume(volp, READ_LOCK);
1074 /* If we did the InlineBulk RPC pull out the return code */
1076 if ((&statsp[0])->errorCode) {
1077 afs_Analyze(tcp, (&statsp[0])->errorCode, &adp->fid, areqp,
1078 AFS_STATS_FS_RPCIDX_BULKSTATUS, SHARED_LOCK, NULL);
1079 code = (&statsp[0])->errorCode;
1084 osi_FreeLargeSpace(statMemp);
1085 osi_FreeLargeSpace(cbfMemp);
1089 /* was: (AFS_DEC_ENV) || defined(AFS_OSF30_ENV) || defined(AFS_NCR_ENV) */
1090 static int AFSDOBULK = 1;
1094 afs_lookup(adp, ndp)
1096 struct nameidata *ndp;
1098 char aname[MAXNAMLEN + 1]; /* XXX */
1099 struct vcache **avcp = (struct vcache **)&(ndp->ni_vp);
1100 struct ucred *acred = ndp->ni_cred;
1101 int wantparent = ndp->ni_nameiop & WANTPARENT;
1102 int opflag = ndp->ni_nameiop & OPFLAG;
1103 #else /* AFS_OSF_ENV */
1104 #if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
1105 afs_lookup(OSI_VC_ARG(adp), aname, avcp, pnp, flags, rdir, acred)
1106 struct pathname *pnp;
1110 #if defined(UKERNEL)
1111 afs_lookup(adp, aname, avcp, acred, flags)
1114 afs_lookup(adp, aname, avcp, acred)
1115 #endif /* UKERNEL */
1116 #endif /* SUN5 || SGI */
1118 struct vcache **avcp;
1120 struct AFS_UCRED *acred;
1123 struct vrequest treq;
1125 register struct vcache *tvc = 0;
1126 register afs_int32 code;
1127 register afs_int32 bulkcode = 0;
1128 int pass = 0, hit = 0;
1130 extern afs_int32 afs_mariner; /*Writing activity to log? */
1131 afs_hyper_t versionNo;
1132 int no_read_access = 0;
1133 struct sysname_info sysState; /* used only for @sys checking */
1134 int dynrootRetry = 1;
1135 struct afs_fakestat_state fakestate;
1136 int tryEvalOnly = 0;
1137 OSI_VC_CONVERT(adp);
1139 AFS_STATCNT(afs_lookup);
1140 afs_InitFakeStat(&fakestate);
1142 if ((code = afs_InitReq(&treq, acred)))
1146 ndp->ni_dvp = AFSTOV(adp);
1147 memcpy(aname, ndp->ni_ptr, ndp->ni_namelen);
1148 aname[ndp->ni_namelen] = '\0';
1149 #endif /* AFS_OSF_ENV */
1151 #if defined(AFS_DARWIN_ENV)
1152 /* Workaround for MacOSX Finder, which tries to look for
1153 * .DS_Store and Contents under every directory.
1155 if (afs_fakestat_enable && adp->mvstat == 1) {
1156 if (strcmp(aname, ".DS_Store") == 0)
1158 if (strcmp(aname, "Contents") == 0)
1164 code = afs_TryEvalFakeStat(&adp, &fakestate, &treq);
1166 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
1167 if (tryEvalOnly && adp->mvstat == 1)
1172 *avcp = NULL; /* Since some callers don't initialize it */
1174 /* come back to here if we encounter a non-existent object in a read-only
1175 * volume's directory */
1178 *avcp = NULL; /* Since some callers don't initialize it */
1181 if (!(adp->states & CStatd)) {
1182 if ((code = afs_VerifyVCache2(adp, &treq))) {
1188 /* watch for ".." in a volume root */
1189 if (adp->mvstat == 2 && aname[0] == '.' && aname[1] == '.' && !aname[2]) {
1190 /* looking up ".." in root via special hacks */
1191 if (adp->mvid == (struct VenusFid *)0 || adp->mvid->Fid.Volume == 0) {
1193 extern struct vcache *afs_globalVp;
1194 if (adp == afs_globalVp) {
1195 struct vnode *rvp = AFSTOV(adp);
1197 ndp->ni_vp = rvp->v_vfsp->vfs_vnodecovered;
1198 ndp->ni_dvp = ndp->ni_vp;
1208 /* otherwise we have the fid here, so we use it */
1209 tvc = afs_GetVCache(adp->mvid, &treq, NULL, NULL);
1210 afs_Trace3(afs_iclSetp, CM_TRACE_GETVCDOTDOT, ICL_TYPE_FID, adp->mvid,
1211 ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32, code);
1213 code = (tvc ? 0 : ENOENT);
1215 if (tvc && !VREFCOUNT(tvc)) {
1219 /*printf("LOOKUP GETVCDOTDOT -> %d\n", code); */
1224 /* now check the access */
1225 if (treq.uid != adp->last_looker) {
1226 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
1231 adp->last_looker = treq.uid;
1234 /* Check for read access as well. We need read access in order to
1235 * stat files, but not to stat subdirectories. */
1236 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS))
1239 /* special case lookup of ".". Can we check for it sooner in this code,
1240 * for instance, way up before "redo:" ??
1241 * I'm not fiddling with the LRUQ here, either, perhaps I should, or else
1242 * invent a lightweight version of GetVCache.
1244 if (aname[0] == '.' && !aname[1]) { /* special case */
1245 ObtainReadLock(&afs_xvcache);
1247 ReleaseReadLock(&afs_xvcache);
1251 if (adp && !VREFCOUNT(adp)) {
1257 Check_AtSys(adp, aname, &sysState, &treq);
1258 tname = sysState.name;
1260 /* 1st Check_AtSys and lookup by tname is required here, for now,
1261 * because the dnlc is *not* told to remove entries for the parent
1262 * dir of file/dir op that afs_LocalHero likes, but dnlc is informed
1263 * if the cached entry for the parent dir is invalidated for a
1265 * Otherwise, we'd be able to do a dnlc lookup on an entry ending
1266 * w/@sys and know the dnlc was consistent with reality. */
1267 tvc = osi_dnlc_lookup(adp, tname, WRITE_LOCK);
1268 *avcp = tvc; /* maybe wasn't initialized, but it is now */
1270 if (no_read_access && vType(tvc) != VDIR && vType(tvc) != VLNK) {
1271 /* need read access on dir to stat non-directory / non-link */
1277 #ifdef AFS_LINUX22_ENV
1278 if (tvc->mvstat == 2) { /* we don't trust the dnlc for root vcaches */
1286 #else /* non - LINUX */
1290 #endif /* linux22 */
1293 { /* sub-block just to reduce stack usage */
1294 register struct dcache *tdc;
1295 afs_size_t dirOffset, dirLen;
1297 struct VenusFid tfid;
1299 /* now we have to lookup the next fid */
1301 afs_GetDCache(adp, (afs_size_t) 0, &treq, &dirOffset, &dirLen, 1);
1303 *avcp = NULL; /* redundant, but harmless */
1308 /* now we will just call dir package with appropriate inode.
1309 * Dirs are always fetched in their entirety for now */
1310 ObtainReadLock(&adp->lock);
1311 ObtainReadLock(&tdc->lock);
1314 * Make sure that the data in the cache is current. There are two
1315 * cases we need to worry about:
1316 * 1. The cache data is being fetched by another process.
1317 * 2. The cache data is no longer valid
1319 while ((adp->states & CStatd)
1320 && (tdc->dflags & DFFetching)
1321 && hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1322 ReleaseReadLock(&tdc->lock);
1323 ReleaseReadLock(&adp->lock);
1324 afs_osi_Sleep(&tdc->validPos);
1325 ObtainReadLock(&adp->lock);
1326 ObtainReadLock(&tdc->lock);
1328 if (!(adp->states & CStatd)
1329 || !hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1330 ReleaseReadLock(&tdc->lock);
1331 ReleaseReadLock(&adp->lock);
1333 if (tname && tname != aname)
1334 osi_FreeLargeSpace(tname);
1338 /* Save the version number for when we call osi_dnlc_enter */
1339 hset(versionNo, tdc->f.versionNo);
1342 * check for, and handle "@sys" if it's there. We should be able
1343 * to avoid the alloc and the strcpy with a little work, but it's
1344 * not pressing. If there aren't any remote users (ie, via the
1345 * NFS translator), we have a slightly easier job.
1346 * the faster way to do this is to check for *aname == '@' and if
1347 * it's there, check for @sys, otherwise, assume there's no @sys
1348 * then, if the lookup fails, check for .*@sys...
1350 /* above now implemented by Check_AtSys and Next_AtSys */
1352 /* lookup the name in the appropriate dir, and return a cache entry
1353 * on the resulting fid */
1354 theDir = tdc->f.inode;
1356 afs_dir_LookupOffset(&theDir, sysState.name, &tfid.Fid,
1359 /* If the first lookup doesn't succeed, maybe it's got @sys in the name */
1360 while (code == ENOENT && Next_AtSys(adp, &treq, &sysState))
1362 afs_dir_LookupOffset(&theDir, sysState.name, &tfid.Fid,
1364 tname = sysState.name;
1366 ReleaseReadLock(&tdc->lock);
1369 if (code == ENOENT && afs_IsDynroot(adp) && dynrootRetry) {
1370 ReleaseReadLock(&adp->lock);
1372 if (tname[0] == '.')
1373 afs_LookupAFSDB(tname + 1);
1375 afs_LookupAFSDB(tname);
1376 if (tname && tname != aname)
1377 osi_FreeLargeSpace(tname);
1380 ReleaseReadLock(&adp->lock);
1383 /* new fid has same cell and volume */
1384 tfid.Cell = adp->fid.Cell;
1385 tfid.Fid.Volume = adp->fid.Fid.Volume;
1386 afs_Trace4(afs_iclSetp, CM_TRACE_LOOKUP, ICL_TYPE_POINTER, adp,
1387 ICL_TYPE_STRING, tname, ICL_TYPE_FID, &tfid,
1388 ICL_TYPE_INT32, code);
1391 if (code != ENOENT) {
1392 printf("LOOKUP dirLookupOff -> %d\n", code);
1397 /* prefetch some entries, if the dir is currently open. The variable
1398 * dirCookie tells us where to start prefetching from.
1400 if (AFSDOBULK && adp->opens > 0 && !(adp->states & CForeign)
1401 && !afs_IsDynroot(adp)) {
1403 /* if the entry is not in the cache, or is in the cache,
1404 * but hasn't been statd, then do a bulk stat operation.
1408 ObtainReadLock(&afs_xvcache);
1409 tvc = afs_FindVCache(&tfid, &retry, 0 /* !stats,!lru */ );
1410 ReleaseReadLock(&afs_xvcache);
1411 } while (tvc && retry);
1413 if (!tvc || !(tvc->states & CStatd))
1414 bulkcode = afs_DoBulkStat(adp, dirCookie, &treq);
1418 /* if the vcache isn't usable, release it */
1419 if (tvc && !(tvc->states & CStatd)) {
1428 /* now get the status info, if we don't already have it */
1429 /* This is kind of weird, but we might wind up accidentally calling
1430 * RXAFS_Lookup because we happened upon a file which legitimately
1431 * has a 0 uniquifier. That is the result of allowing unique to wrap
1432 * to 0. This was fixed in AFS 3.4. For CForeign, Unique == 0 means that
1433 * the file has not yet been looked up.
1436 afs_int32 cached = 0;
1437 if (!tfid.Fid.Unique && (adp->states & CForeign)) {
1438 tvc = afs_LookupVCache(&tfid, &treq, &cached, adp, tname);
1440 if (!tvc && !bulkcode) { /* lookup failed or wasn't called */
1441 tvc = afs_GetVCache(&tfid, &treq, &cached, NULL);
1444 } /* sub-block just to reduce stack usage */
1447 int force_eval = afs_fakestat_enable ? 0 : 1;
1449 if (adp->states & CForeign)
1450 tvc->states |= CForeign;
1451 tvc->parentVnode = adp->fid.Fid.Vnode;
1452 tvc->parentUnique = adp->fid.Fid.Unique;
1453 tvc->states &= ~CBulkStat;
1455 if (afs_fakestat_enable == 2 && tvc->mvstat == 1) {
1456 ObtainSharedLock(&tvc->lock, 680);
1457 if (!tvc->linkData) {
1458 UpgradeSToWLock(&tvc->lock, 681);
1459 code = afs_HandleLink(tvc, &treq);
1460 ConvertWToRLock(&tvc->lock);
1462 ConvertSToRLock(&tvc->lock);
1465 if (!code && !afs_strchr(tvc->linkData, ':'))
1467 ReleaseReadLock(&tvc->lock);
1469 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1470 if (!(flags & AFS_LOOKUP_NOEVAL))
1471 /* don't eval mount points */
1472 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1473 if (tvc->mvstat == 1 && force_eval) {
1474 /* a mt point, possibly unevaluated */
1475 struct volume *tvolp;
1477 ObtainWriteLock(&tvc->lock, 133);
1478 code = EvalMountPoint(tvc, adp, &tvolp, &treq);
1479 ReleaseWriteLock(&tvc->lock);
1484 afs_PutVolume(tvolp, WRITE_LOCK);
1488 /* next, we want to continue using the target of the mt point */
1489 if (tvc->mvid && (tvc->states & CMValid)) {
1491 /* now lookup target, to set .. pointer */
1492 afs_Trace2(afs_iclSetp, CM_TRACE_LOOKUP1,
1493 ICL_TYPE_POINTER, tvc, ICL_TYPE_FID,
1495 uvc = tvc; /* remember for later */
1497 if (tvolp && (tvolp->states & VForeign)) {
1498 /* XXXX tvolp has ref cnt on but not locked! XXX */
1500 afs_GetRootVCache(tvc->mvid, &treq, NULL, tvolp);
1502 tvc = afs_GetVCache(tvc->mvid, &treq, NULL, NULL);
1504 afs_PutVCache(uvc); /* we're done with it */
1509 afs_PutVolume(tvolp, WRITE_LOCK);
1514 /* now, if we came via a new mt pt (say because of a new
1515 * release of a R/O volume), we must reevaluate the ..
1516 * ptr to point back to the appropriate place */
1518 ObtainWriteLock(&tvc->lock, 134);
1519 if (tvc->mvid == NULL) {
1520 tvc->mvid = (struct VenusFid *)
1521 osi_AllocSmallSpace(sizeof(struct VenusFid));
1523 /* setup backpointer */
1524 *tvc->mvid = tvolp->dotdot;
1525 ReleaseWriteLock(&tvc->lock);
1526 afs_PutVolume(tvolp, WRITE_LOCK);
1532 afs_PutVolume(tvolp, WRITE_LOCK);
1537 if (tvc && !VREFCOUNT(tvc)) {
1542 /* if we get here, we found something in a directory that couldn't
1543 * be located (a Multics "connection failure"). If the volume is
1544 * read-only, we try flushing this entry from the cache and trying
1548 tv = afs_GetVolume(&adp->fid, &treq, READ_LOCK);
1550 if (tv->states & VRO) {
1551 pass = 1; /* try this *once* */
1552 ObtainWriteLock(&afs_xcbhash, 495);
1553 afs_DequeueCallback(adp);
1554 /* re-stat to get later version */
1555 adp->states &= ~CStatd;
1556 ReleaseWriteLock(&afs_xcbhash);
1557 osi_dnlc_purgedp(adp);
1558 afs_PutVolume(tv, READ_LOCK);
1561 afs_PutVolume(tv, READ_LOCK);
1568 /* put the network buffer back, if need be */
1569 if (tname != aname && tname)
1570 osi_FreeLargeSpace(tname);
1573 /* Handle RENAME; only need to check rename "." */
1574 if (opflag == RENAME && wantparent && *ndp->ni_next == 0) {
1575 if (!FidCmp(&(tvc->fid), &(adp->fid))) {
1576 afs_PutVCache(*avcp);
1578 afs_PutFakeStat(&fakestate);
1579 return afs_CheckCode(EISDIR, &treq, 18);
1582 #endif /* AFS_OSF_ENV */
1585 afs_AddMarinerName(aname, tvc);
1587 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1588 if (!(flags & AFS_LOOKUP_NOEVAL))
1589 /* Here we don't enter the name into the DNLC because we want the
1590 * evaluated mount dir to be there (the vcache for the mounted volume)
1591 * rather than the vc of the mount point itself. we can still find the
1592 * mount point's vc in the vcache by its fid. */
1593 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1595 osi_dnlc_enter(adp, aname, tvc, &versionNo);
1597 #ifdef AFS_LINUX20_ENV
1598 /* So Linux inode cache is up to date. */
1599 code = afs_VerifyVCache(tvc, &treq);
1601 afs_PutFakeStat(&fakestate);
1602 return 0; /* can't have been any errors if hit and !code */
1609 code = afs_CheckCode(code, &treq, 19);
1611 /* If there is an error, make sure *avcp is null.
1612 * Alphas panic otherwise - defect 10719.
1617 afs_PutFakeStat(&fakestate);