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 = 0, 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, const 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);
451 state->name = (char *)aname;
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)[(unsigned int)state->index])
504 return 0; /* end of list */
506 strcpy(state->name + state->offset, (*sysnamelist)[(unsigned int)state->index]);
510 extern int BlobScan(struct dcache * afile, afs_int32 ablob);
512 /* called with an unlocked directory and directory cookie. Areqp
513 * describes who is making the call.
514 * Scans the next N (about 30, typically) directory entries, and does
515 * a bulk stat call to stat them all.
517 * Must be very careful when merging in RPC responses, since we dont
518 * want to overwrite newer info that was added by a file system mutating
519 * call that ran concurrently with our bulk stat call.
521 * We do that, as described below, by not merging in our info (always
522 * safe to skip the merge) if the status info is valid in the vcache entry.
524 * If adapt ever implements the bulk stat RPC, then this code will need to
525 * ensure that vcaches created for failed RPC's to older servers have the
528 static struct vcache *BStvc = NULL;
531 afs_DoBulkStat(struct vcache *adp, long dirCookie, struct vrequest *areqp)
533 int nentries; /* # of entries to prefetch */
534 int nskip; /* # of slots in the LRU queue to skip */
535 struct vcache *lruvcp; /* vcache ptr of our goal pos in LRU queue */
536 struct dcache *dcp; /* chunk containing the dir block */
537 char *statMemp; /* status memory block */
538 char *cbfMemp; /* callback and fid memory block */
539 afs_size_t temp; /* temp for holding chunk length, &c. */
540 struct AFSFid *fidsp; /* file IDs were collecting */
541 struct AFSCallBack *cbsp; /* call back pointers */
542 struct AFSCallBack *tcbp; /* temp callback ptr */
543 struct AFSFetchStatus *statsp; /* file status info */
544 struct AFSVolSync volSync; /* vol sync return info */
545 struct vcache *tvcp; /* temp vcp */
546 struct afs_q *tq; /* temp queue variable */
547 AFSCBFids fidParm; /* file ID parm for bulk stat */
548 AFSBulkStats statParm; /* stat info parm for bulk stat */
549 int fidIndex = 0; /* which file were stating */
550 struct conn *tcp = 0; /* conn for call */
551 AFSCBs cbParm; /* callback parm for bulk stat */
552 struct server *hostp = 0; /* host we got callback from */
553 long startTime; /* time we started the call,
554 * for callback expiration base
556 afs_size_t statSeqNo = 0; /* Valued of file size to detect races */
557 int code; /* error code */
558 long newIndex; /* new index in the dir */
559 struct DirEntry *dirEntryp; /* dir entry we are examining */
561 struct VenusFid afid; /* file ID we are using now */
562 struct VenusFid tfid; /* another temp. file ID */
563 afs_int32 retry; /* handle low-level SGI MP race conditions */
564 long volStates; /* flags from vol structure */
565 struct volume *volp = 0; /* volume ptr */
566 struct VenusFid dotdot;
567 int flagIndex = 0; /* First file with bulk fetch flag set */
568 int inlinebulk = 0; /* Did we use InlineBulk RPC or not? */
570 /* first compute some basic parameters. We dont want to prefetch more
571 * than a fraction of the cache in any given call, and we want to preserve
572 * a portion of the LRU queue in any event, so as to avoid thrashing
573 * the entire stat cache (we will at least leave some of it alone).
574 * presently dont stat more than 1/8 the cache in any one call. */
575 nentries = afs_cacheStats / 8;
577 /* dont bother prefetching more than one calls worth of info */
578 if (nentries > AFSCBMAX)
581 /* heuristic to make sure that things fit in 4K. This means that
582 * we shouldnt make it any bigger than 47 entries. I am typically
583 * going to keep it a little lower, since we don't want to load
584 * too much of the stat cache.
589 /* now, to reduce the stack size, well allocate two 4K blocks,
590 * one for fids and callbacks, and one for stat info. Well set
591 * up our pointers to the memory from there, too.
593 statMemp = osi_AllocLargeSpace(nentries * sizeof(AFSFetchStatus));
594 statsp = (struct AFSFetchStatus *)statMemp;
596 osi_AllocLargeSpace(nentries *
597 (sizeof(AFSCallBack) + sizeof(AFSFid)));
598 fidsp = (AFSFid *) cbfMemp;
599 cbsp = (AFSCallBack *) (cbfMemp + nentries * sizeof(AFSFid));
601 /* next, we must iterate over the directory, starting from the specified
602 * cookie offset (dirCookie), and counting out nentries file entries.
603 * We skip files that already have stat cache entries, since we
604 * dont want to bulk stat files that are already in the cache.
607 code = afs_VerifyVCache(adp, areqp);
611 dcp = afs_GetDCache(adp, (afs_size_t) 0, areqp, &temp, &temp, 1);
617 /* lock the directory cache entry */
618 ObtainReadLock(&adp->lock);
619 ObtainReadLock(&dcp->lock);
622 * Make sure that the data in the cache is current. There are two
623 * cases we need to worry about:
624 * 1. The cache data is being fetched by another process.
625 * 2. The cache data is no longer valid
627 while ((adp->states & CStatd)
628 && (dcp->dflags & DFFetching)
629 && hsame(adp->m.DataVersion, dcp->f.versionNo)) {
630 afs_Trace4(afs_iclSetp, CM_TRACE_DCACHEWAIT, ICL_TYPE_STRING,
631 __FILE__, ICL_TYPE_INT32, __LINE__, ICL_TYPE_POINTER, dcp,
632 ICL_TYPE_INT32, dcp->dflags);
633 ReleaseReadLock(&dcp->lock);
634 ReleaseReadLock(&adp->lock);
635 afs_osi_Sleep(&dcp->validPos);
636 ObtainReadLock(&adp->lock);
637 ObtainReadLock(&dcp->lock);
639 if (!(adp->states & CStatd)
640 || !hsame(adp->m.DataVersion, dcp->f.versionNo)) {
641 ReleaseReadLock(&dcp->lock);
642 ReleaseReadLock(&adp->lock);
647 /* Generate a sequence number so we can tell whether we should
648 * store the attributes when processing the response. This number is
649 * stored in the file size when we set the CBulkFetching bit. If the
650 * CBulkFetching is still set and this value hasn't changed, then
651 * we know we were the last to set CBulkFetching bit for this file,
652 * and it is safe to set the status information for this file.
654 statSeqNo = bulkStatCounter++;
656 /* now we have dir data in the cache, so scan the dir page */
659 while (1) { /* Should probably have some constant bound */
660 /* look for first safe entry to examine in the directory. BlobScan
661 * looks for a the 1st allocated dir after the dirCookie slot.
663 newIndex = BlobScan(dcp, (dirCookie >> 5));
667 /* remember the updated directory cookie */
668 dirCookie = newIndex << 5;
670 /* get a ptr to the dir entry */
672 (struct DirEntry *)afs_dir_GetBlob(dcp, newIndex);
676 /* dont copy more than we have room for */
677 if (fidIndex >= nentries) {
678 DRelease((struct buffer *)dirEntryp, 0);
682 /* now, if the dir entry looks good, copy it out to our list. Vnode
683 * 0 means deleted, although it should also be free were it deleted.
685 if (dirEntryp->fid.vnode != 0) {
686 /* dont copy entries we have in our cache. This check will
687 * also make us skip "." and probably "..", unless it has
688 * disappeared from the cache since we did our namei call.
690 tfid.Cell = adp->fid.Cell;
691 tfid.Fid.Volume = adp->fid.Fid.Volume;
692 tfid.Fid.Vnode = ntohl(dirEntryp->fid.vnode);
693 tfid.Fid.Unique = ntohl(dirEntryp->fid.vunique);
696 ObtainWriteLock(&afs_xvcache, 130);
697 tvcp = afs_FindVCache(&tfid, &retry, 0 /* no stats | LRU */ );
699 ReleaseWriteLock(&afs_xvcache);
702 } while (tvcp && retry);
703 if (!tvcp) { /* otherwise, create manually */
704 tvcp = afs_NewVCache(&tfid, hostp);
705 ObtainWriteLock(&tvcp->lock, 505);
706 ReleaseWriteLock(&afs_xvcache);
707 afs_RemoveVCB(&tfid);
708 ReleaseWriteLock(&tvcp->lock);
710 ReleaseWriteLock(&afs_xvcache);
713 goto done; /* can't happen at present, more's the pity */
715 /* WARNING: afs_DoBulkStat uses the Length field to store a
716 * sequence number for each bulk status request. Under no
717 * circumstances should afs_DoBulkStat store a sequence number
718 * if the new length will be ignored when afs_ProcessFS is
719 * called with new stats. */
721 if (!(tvcp->states & (CStatd | CBulkFetching))
722 && (tvcp->execsOrWriters <= 0)
723 && !afs_DirtyPages(tvcp)
724 && !AFS_VN_MAPPED((vnode_t *) tvcp))
726 if (!(tvcp->states & (CStatd | CBulkFetching))
727 && (tvcp->execsOrWriters <= 0)
728 && !afs_DirtyPages(tvcp))
732 /* this entry doesnt exist in the cache, and is not
733 * already being fetched by someone else, so add it to the
734 * list of file IDs to obtain.
736 * We detect a callback breaking race condition by checking the
737 * CBulkFetching state bit and the value in the file size.
738 * It is safe to set the status only if the CBulkFetching
739 * flag is still set and the value in the file size does
742 * Don't fetch status for dirty files. We need to
743 * preserve the value of the file size. We could
744 * flush the pages, but it wouldn't be worthwhile.
746 memcpy((char *)(fidsp + fidIndex), (char *)&tfid.Fid,
748 tvcp->states |= CBulkFetching;
749 tvcp->m.Length = statSeqNo;
755 /* if dir vnode has non-zero entry */
756 /* move to the next dir entry by adding in the # of entries
757 * used by this dir entry.
759 temp = afs_dir_NameBlobs(dirEntryp->name) << 5;
760 DRelease((struct buffer *)dirEntryp, 0);
764 } /* while loop over all dir entries */
766 /* now release the dir lock and prepare to make the bulk RPC */
767 ReleaseReadLock(&dcp->lock);
768 ReleaseReadLock(&adp->lock);
770 /* release the chunk */
773 /* dont make a null call */
778 /* setup the RPC parm structures */
779 fidParm.AFSCBFids_len = fidIndex;
780 fidParm.AFSCBFids_val = fidsp;
781 statParm.AFSBulkStats_len = fidIndex;
782 statParm.AFSBulkStats_val = statsp;
783 cbParm.AFSCBs_len = fidIndex;
784 cbParm.AFSCBs_val = cbsp;
786 /* start the timer; callback expirations are relative to this */
787 startTime = osi_Time();
789 tcp = afs_Conn(&adp->fid, areqp, SHARED_LOCK);
791 hostp = tcp->srvr->server;
792 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_BULKSTATUS);
795 if (!(tcp->srvr->server->flags & SNO_INLINEBULK)) {
797 RXAFS_InlineBulkStatus(tcp->id, &fidParm, &statParm,
799 if (code == RXGEN_OPCODE) {
800 tcp->srvr->server->flags |= SNO_INLINEBULK;
803 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm,
810 RXAFS_BulkStatus(tcp->id, &fidParm, &statParm, &cbParm,
818 (tcp, code, &adp->fid, areqp, AFS_STATS_FS_RPCIDX_BULKSTATUS,
821 /* now, if we didnt get the info, bail out. */
825 /* we need vol flags to create the entries properly */
826 dotdot.Fid.Volume = 0;
827 volp = afs_GetVolume(&adp->fid, areqp, READ_LOCK);
829 volStates = volp->states;
830 if (volp->dotdot.Fid.Volume != 0)
831 dotdot = volp->dotdot;
835 /* find the place to merge the info into We do this by skipping
836 * nskip entries in the LRU queue. The more we skip, the more
837 * we preserve, since the head of the VLRU queue is the most recently
841 nskip = afs_cacheStats / 2; /* preserved fraction of the cache */
842 ObtainReadLock(&afs_xvcache);
844 /* actually a serious error, probably should panic. Probably will
845 * panic soon, oh well. */
846 ReleaseReadLock(&afs_xvcache);
847 afs_warnuser("afs_DoBulkStat: VLRU empty!");
850 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
851 refpanic("Bulkstat VLRU inconsistent");
853 for (tq = VLRU.next; tq != &VLRU; tq = QNext(tq)) {
856 else if (QNext(QPrev(tq)) != tq) {
858 refpanic("BulkStat VLRU inconsistent");
864 lruvcp = QTOV(VLRU.next);
866 /* now we have to hold this entry, so that it does not get moved
867 * into the free list while we're running. It could still get
868 * moved within the lru queue, but hopefully that will be rare; it
869 * doesn't hurt nearly as much.
872 osi_vnhold(lruvcp, &retry);
873 ReleaseReadLock(&afs_xvcache); /* could be read lock */
877 /* otherwise, merge in the info. We have to be quite careful here,
878 * since we need to ensure that we don't merge old info over newer
879 * stuff in a stat cache entry. We're very conservative here: we don't
880 * do the merge at all unless we ourselves create the stat cache
881 * entry. That's pretty safe, and should work pretty well, since we
882 * typically expect to do the stat cache creation ourselves.
884 * We also have to take into account racing token revocations.
886 for (i = 0; i < fidIndex; i++) {
887 if ((&statsp[i])->errorCode)
889 afid.Cell = adp->fid.Cell;
890 afid.Fid.Volume = adp->fid.Fid.Volume;
891 afid.Fid.Vnode = fidsp[i].Vnode;
892 afid.Fid.Unique = fidsp[i].Unique;
895 ObtainReadLock(&afs_xvcache);
896 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
897 ReleaseReadLock(&afs_xvcache);
898 } while (tvcp && retry);
900 /* The entry may no longer exist */
905 /* now we have the entry held, but we need to fill it in */
906 ObtainWriteLock(&tvcp->lock, 131);
908 /* if CBulkFetching is not set, or if the file size no longer
909 * matches the value we placed there when we set the CBulkFetching
910 * flag, then someone else has done something with this node,
911 * and we may not have the latest status information for this
912 * file. Leave the entry alone.
914 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
916 ReleaseWriteLock(&tvcp->lock);
921 /* now copy ".." entry back out of volume structure, if necessary */
922 if (tvcp->mvstat == 2 && (dotdot.Fid.Volume != 0)) {
924 tvcp->mvid = (struct VenusFid *)
925 osi_AllocSmallSpace(sizeof(struct VenusFid));
926 *tvcp->mvid = dotdot;
929 ObtainWriteLock(&afs_xvcache, 132);
930 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
931 refpanic("Bulkstat VLRU inconsistent2");
933 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
934 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
935 refpanic("Bulkstat VLRU inconsistent4");
937 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
938 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
939 refpanic("Bulkstat VLRU inconsistent5");
942 if (tvcp != lruvcp) { /* if they are == don't move it, don't corrupt vlru */
943 QRemove(&tvcp->vlruq);
944 QAdd(&lruvcp->vlruq, &tvcp->vlruq);
947 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
948 refpanic("Bulkstat VLRU inconsistent3");
950 if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
951 || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
952 refpanic("Bulkstat VLRU inconsistent5");
954 if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
955 || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
956 refpanic("Bulkstat VLRU inconsistent6");
958 ReleaseWriteLock(&afs_xvcache);
960 ObtainWriteLock(&afs_xcbhash, 494);
962 /* We need to check the flags again. We may have missed
963 * something while we were waiting for a lock.
965 if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
967 ReleaseWriteLock(&tvcp->lock);
968 ReleaseWriteLock(&afs_xcbhash);
973 /* now merge in the resulting status back into the vnode.
974 * We only do this if the entry looks clear.
976 afs_ProcessFS(tvcp, &statsp[i], areqp);
977 #ifdef AFS_LINUX22_ENV
978 /* overwrite the ops if it's a directory or symlink. */
979 if (vType(tvcp) == VDIR)
980 tvcp->v.v_op = &afs_dir_iops;
981 else if (vType(tvcp) == VLNK)
982 tvcp->v.v_op = &afs_symlink_iops;
985 /* do some accounting for bulk stats: mark this entry as
986 * loaded, so we can tell if we use it before it gets
989 tvcp->states |= CBulkStat;
990 tvcp->states &= ~CBulkFetching;
994 /* merge in vol info */
997 if (volStates & VBackup)
998 tvcp->states |= CBackup;
999 if (volStates & VForeign)
1000 tvcp->states |= CForeign;
1002 /* merge in the callback info */
1003 tvcp->states |= CTruth;
1005 /* get ptr to the callback we are interested in */
1008 if (tcbp->ExpirationTime != 0) {
1009 tvcp->cbExpires = tcbp->ExpirationTime + startTime;
1010 tvcp->callback = hostp;
1011 tvcp->states |= CStatd;
1012 afs_QueueCallback(tvcp, CBHash(tcbp->ExpirationTime), volp);
1013 } else if (tvcp->states & CRO) {
1014 /* ordinary callback on a read-only volume -- AFS 3.2 style */
1015 tvcp->cbExpires = 3600 + startTime;
1016 tvcp->callback = hostp;
1017 tvcp->states |= CStatd;
1018 afs_QueueCallback(tvcp, CBHash(3600), volp);
1021 tvcp->states &= ~(CStatd | CUnique);
1022 afs_DequeueCallback(tvcp);
1023 if ((tvcp->states & CForeign) || (vType(tvcp) == VDIR))
1024 osi_dnlc_purgedp(tvcp); /* if it (could be) a directory */
1026 ReleaseWriteLock(&afs_xcbhash);
1028 ReleaseWriteLock(&tvcp->lock);
1029 /* finally, we're done with the entry */
1030 afs_PutVCache(tvcp);
1031 } /* for all files we got back */
1033 /* finally return the pointer into the LRU queue */
1034 afs_PutVCache(lruvcp);
1037 /* Be sure to turn off the CBulkFetching flags */
1038 for (i = flagIndex; i < fidIndex; i++) {
1039 afid.Cell = adp->fid.Cell;
1040 afid.Fid.Volume = adp->fid.Fid.Volume;
1041 afid.Fid.Vnode = fidsp[i].Vnode;
1042 afid.Fid.Unique = fidsp[i].Unique;
1045 ObtainReadLock(&afs_xvcache);
1046 tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
1047 ReleaseReadLock(&afs_xvcache);
1048 } while (tvcp && retry);
1049 if (tvcp != NULL && (tvcp->states & CBulkFetching)
1050 && (tvcp->m.Length == statSeqNo)) {
1051 tvcp->states &= ~CBulkFetching;
1054 afs_PutVCache(tvcp);
1058 afs_PutVolume(volp, READ_LOCK);
1060 /* If we did the InlineBulk RPC pull out the return code */
1062 if ((&statsp[0])->errorCode) {
1063 afs_Analyze(tcp, (&statsp[0])->errorCode, &adp->fid, areqp,
1064 AFS_STATS_FS_RPCIDX_BULKSTATUS, SHARED_LOCK, NULL);
1065 code = (&statsp[0])->errorCode;
1071 osi_FreeLargeSpace(statMemp);
1072 osi_FreeLargeSpace(cbfMemp);
1076 /* was: (AFS_DEC_ENV) || defined(AFS_OSF30_ENV) || defined(AFS_NCR_ENV) */
1077 static int AFSDOBULK = 1;
1081 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred, int opflag, int wantparent)
1082 #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
1083 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct pathname *pnp, int flags, struct vnode *rdir, struct AFS_UCRED *acred)
1084 #elif defined(UKERNEL)
1085 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred, int flags)
1087 afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred)
1090 struct vrequest treq;
1092 register struct vcache *tvc = 0;
1093 register afs_int32 code;
1094 register afs_int32 bulkcode = 0;
1095 int pass = 0, hit = 0;
1097 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;
1104 OSI_VC_CONVERT(adp);
1106 AFS_STATCNT(afs_lookup);
1107 afs_InitFakeStat(&fakestate);
1109 if ((code = afs_InitReq(&treq, acred)))
1113 ndp->ni_dvp = AFSTOV(adp);
1114 #endif /* AFS_OSF_ENV */
1116 #if defined(AFS_DARWIN_ENV)
1117 /* Workaround for MacOSX Finder, which tries to look for
1118 * .DS_Store and Contents under every directory.
1120 if (afs_fakestat_enable && adp->mvstat == 1) {
1121 if (strcmp(aname, ".DS_Store") == 0)
1123 if (strcmp(aname, "Contents") == 0)
1129 code = afs_TryEvalFakeStat(&adp, &fakestate, &treq);
1131 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
1132 if (tryEvalOnly && adp->mvstat == 1)
1137 *avcp = NULL; /* Since some callers don't initialize it */
1139 /* come back to here if we encounter a non-existent object in a read-only
1140 * volume's directory */
1143 *avcp = NULL; /* Since some callers don't initialize it */
1146 if (!(adp->states & CStatd)) {
1147 if ((code = afs_VerifyVCache2(adp, &treq))) {
1153 /* watch for ".." in a volume root */
1154 if (adp->mvstat == 2 && aname[0] == '.' && aname[1] == '.' && !aname[2]) {
1155 /* looking up ".." in root via special hacks */
1156 if (adp->mvid == (struct VenusFid *)0 || adp->mvid->Fid.Volume == 0) {
1158 extern struct vcache *afs_globalVp;
1159 if (adp == afs_globalVp) {
1160 struct vnode *rvp = AFSTOV(adp);
1162 ndp->ni_vp = rvp->v_vfsp->vfs_vnodecovered;
1163 ndp->ni_dvp = ndp->ni_vp;
1173 /* otherwise we have the fid here, so we use it */
1174 tvc = afs_GetVCache(adp->mvid, &treq, NULL, NULL);
1175 afs_Trace3(afs_iclSetp, CM_TRACE_GETVCDOTDOT, ICL_TYPE_FID, adp->mvid,
1176 ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32, code);
1178 code = (tvc ? 0 : ENOENT);
1180 if (tvc && !VREFCOUNT(tvc)) {
1184 /*printf("LOOKUP GETVCDOTDOT -> %d\n", code); */
1189 /* now check the access */
1190 if (treq.uid != adp->last_looker) {
1191 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
1196 adp->last_looker = treq.uid;
1199 /* Check for read access as well. We need read access in order to
1200 * stat files, but not to stat subdirectories. */
1201 if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS))
1204 /* special case lookup of ".". Can we check for it sooner in this code,
1205 * for instance, way up before "redo:" ??
1206 * I'm not fiddling with the LRUQ here, either, perhaps I should, or else
1207 * invent a lightweight version of GetVCache.
1209 if (aname[0] == '.' && !aname[1]) { /* special case */
1210 ObtainReadLock(&afs_xvcache);
1212 ReleaseReadLock(&afs_xvcache);
1216 if (adp && !VREFCOUNT(adp)) {
1222 Check_AtSys(adp, aname, &sysState, &treq);
1223 tname = sysState.name;
1225 /* 1st Check_AtSys and lookup by tname is required here, for now,
1226 * because the dnlc is *not* told to remove entries for the parent
1227 * dir of file/dir op that afs_LocalHero likes, but dnlc is informed
1228 * if the cached entry for the parent dir is invalidated for a
1230 * Otherwise, we'd be able to do a dnlc lookup on an entry ending
1231 * w/@sys and know the dnlc was consistent with reality. */
1232 tvc = osi_dnlc_lookup(adp, tname, WRITE_LOCK);
1233 *avcp = tvc; /* maybe wasn't initialized, but it is now */
1235 if (no_read_access && vType(tvc) != VDIR && vType(tvc) != VLNK) {
1236 /* need read access on dir to stat non-directory / non-link */
1242 #ifdef AFS_LINUX22_ENV
1243 if (tvc->mvstat == 2) { /* we don't trust the dnlc for root vcaches */
1244 AFS_RELE(AFSTOV(tvc));
1251 #else /* non - LINUX */
1255 #endif /* linux22 */
1258 { /* sub-block just to reduce stack usage */
1259 register struct dcache *tdc;
1260 afs_size_t dirOffset, dirLen;
1261 struct VenusFid tfid;
1263 /* now we have to lookup the next fid */
1265 afs_GetDCache(adp, (afs_size_t) 0, &treq, &dirOffset, &dirLen, 1);
1267 *avcp = NULL; /* redundant, but harmless */
1272 /* now we will just call dir package with appropriate inode.
1273 * Dirs are always fetched in their entirety for now */
1274 ObtainReadLock(&adp->lock);
1275 ObtainReadLock(&tdc->lock);
1278 * Make sure that the data in the cache is current. There are two
1279 * cases we need to worry about:
1280 * 1. The cache data is being fetched by another process.
1281 * 2. The cache data is no longer valid
1283 while ((adp->states & CStatd)
1284 && (tdc->dflags & DFFetching)
1285 && hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1286 ReleaseReadLock(&tdc->lock);
1287 ReleaseReadLock(&adp->lock);
1288 afs_osi_Sleep(&tdc->validPos);
1289 ObtainReadLock(&adp->lock);
1290 ObtainReadLock(&tdc->lock);
1292 if (!(adp->states & CStatd)
1293 || !hsame(adp->m.DataVersion, tdc->f.versionNo)) {
1294 ReleaseReadLock(&tdc->lock);
1295 ReleaseReadLock(&adp->lock);
1297 if (tname && tname != aname)
1298 osi_FreeLargeSpace(tname);
1302 /* Save the version number for when we call osi_dnlc_enter */
1303 hset(versionNo, tdc->f.versionNo);
1306 * check for, and handle "@sys" if it's there. We should be able
1307 * to avoid the alloc and the strcpy with a little work, but it's
1308 * not pressing. If there aren't any remote users (ie, via the
1309 * NFS translator), we have a slightly easier job.
1310 * the faster way to do this is to check for *aname == '@' and if
1311 * it's there, check for @sys, otherwise, assume there's no @sys
1312 * then, if the lookup fails, check for .*@sys...
1314 /* above now implemented by Check_AtSys and Next_AtSys */
1316 /* lookup the name in the appropriate dir, and return a cache entry
1317 * on the resulting fid */
1319 afs_dir_LookupOffset(tdc, sysState.name, &tfid.Fid,
1322 /* If the first lookup doesn't succeed, maybe it's got @sys in the name */
1323 while (code == ENOENT && Next_AtSys(adp, &treq, &sysState))
1325 afs_dir_LookupOffset(tdc, sysState.name, &tfid.Fid,
1327 tname = sysState.name;
1329 ReleaseReadLock(&tdc->lock);
1332 if (code == ENOENT && afs_IsDynroot(adp) && dynrootRetry) {
1333 ReleaseReadLock(&adp->lock);
1335 if (tname[0] == '.')
1336 afs_LookupAFSDB(tname + 1);
1338 afs_LookupAFSDB(tname);
1339 if (tname && tname != aname)
1340 osi_FreeLargeSpace(tname);
1343 ReleaseReadLock(&adp->lock);
1346 /* new fid has same cell and volume */
1347 tfid.Cell = adp->fid.Cell;
1348 tfid.Fid.Volume = adp->fid.Fid.Volume;
1349 afs_Trace4(afs_iclSetp, CM_TRACE_LOOKUP, ICL_TYPE_POINTER, adp,
1350 ICL_TYPE_STRING, tname, ICL_TYPE_FID, &tfid,
1351 ICL_TYPE_INT32, code);
1354 if (code != ENOENT) {
1355 printf("LOOKUP dirLookupOff -> %d\n", code);
1360 /* prefetch some entries, if the dir is currently open. The variable
1361 * dirCookie tells us where to start prefetching from.
1363 if (AFSDOBULK && adp->opens > 0 && !(adp->states & CForeign)
1364 && !afs_IsDynroot(adp)) {
1366 /* if the entry is not in the cache, or is in the cache,
1367 * but hasn't been statd, then do a bulk stat operation.
1371 ObtainReadLock(&afs_xvcache);
1372 tvc = afs_FindVCache(&tfid, &retry, 0 /* !stats,!lru */ );
1373 ReleaseReadLock(&afs_xvcache);
1374 } while (tvc && retry);
1376 if (!tvc || !(tvc->states & CStatd))
1377 bulkcode = afs_DoBulkStat(adp, dirCookie, &treq);
1381 /* if the vcache isn't usable, release it */
1382 if (tvc && !(tvc->states & CStatd)) {
1391 /* now get the status info, if we don't already have it */
1392 /* This is kind of weird, but we might wind up accidentally calling
1393 * RXAFS_Lookup because we happened upon a file which legitimately
1394 * has a 0 uniquifier. That is the result of allowing unique to wrap
1395 * to 0. This was fixed in AFS 3.4. For CForeign, Unique == 0 means that
1396 * the file has not yet been looked up.
1399 afs_int32 cached = 0;
1400 if (!tfid.Fid.Unique && (adp->states & CForeign)) {
1401 tvc = afs_LookupVCache(&tfid, &treq, &cached, adp, tname);
1403 if (!tvc && !bulkcode) { /* lookup failed or wasn't called */
1404 tvc = afs_GetVCache(&tfid, &treq, &cached, NULL);
1407 } /* sub-block just to reduce stack usage */
1410 int force_eval = afs_fakestat_enable ? 0 : 1;
1412 if (adp->states & CForeign)
1413 tvc->states |= CForeign;
1414 tvc->parentVnode = adp->fid.Fid.Vnode;
1415 tvc->parentUnique = adp->fid.Fid.Unique;
1416 tvc->states &= ~CBulkStat;
1418 if (afs_fakestat_enable == 2 && tvc->mvstat == 1) {
1419 ObtainSharedLock(&tvc->lock, 680);
1420 if (!tvc->linkData) {
1421 UpgradeSToWLock(&tvc->lock, 681);
1422 code = afs_HandleLink(tvc, &treq);
1423 ConvertWToRLock(&tvc->lock);
1425 ConvertSToRLock(&tvc->lock);
1428 if (!code && !afs_strchr(tvc->linkData, ':'))
1430 ReleaseReadLock(&tvc->lock);
1432 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1433 if (!(flags & AFS_LOOKUP_NOEVAL))
1434 /* don't eval mount points */
1435 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1436 if (tvc->mvstat == 1 && force_eval) {
1437 /* a mt point, possibly unevaluated */
1438 struct volume *tvolp;
1440 ObtainWriteLock(&tvc->lock, 133);
1441 code = EvalMountPoint(tvc, adp, &tvolp, &treq);
1442 ReleaseWriteLock(&tvc->lock);
1447 afs_PutVolume(tvolp, WRITE_LOCK);
1451 /* next, we want to continue using the target of the mt point */
1452 if (tvc->mvid && (tvc->states & CMValid)) {
1454 /* now lookup target, to set .. pointer */
1455 afs_Trace2(afs_iclSetp, CM_TRACE_LOOKUP1,
1456 ICL_TYPE_POINTER, tvc, ICL_TYPE_FID,
1458 uvc = tvc; /* remember for later */
1460 if (tvolp && (tvolp->states & VForeign)) {
1461 /* XXXX tvolp has ref cnt on but not locked! XXX */
1463 afs_GetRootVCache(tvc->mvid, &treq, NULL, tvolp);
1465 tvc = afs_GetVCache(tvc->mvid, &treq, NULL, NULL);
1467 afs_PutVCache(uvc); /* we're done with it */
1472 afs_PutVolume(tvolp, WRITE_LOCK);
1477 /* now, if we came via a new mt pt (say because of a new
1478 * release of a R/O volume), we must reevaluate the ..
1479 * ptr to point back to the appropriate place */
1481 ObtainWriteLock(&tvc->lock, 134);
1482 if (tvc->mvid == NULL) {
1483 tvc->mvid = (struct VenusFid *)
1484 osi_AllocSmallSpace(sizeof(struct VenusFid));
1486 /* setup backpointer */
1487 *tvc->mvid = tvolp->dotdot;
1488 ReleaseWriteLock(&tvc->lock);
1489 afs_PutVolume(tvolp, WRITE_LOCK);
1495 afs_PutVolume(tvolp, WRITE_LOCK);
1500 if (tvc && !VREFCOUNT(tvc)) {
1505 /* if we get here, we found something in a directory that couldn't
1506 * be located (a Multics "connection failure"). If the volume is
1507 * read-only, we try flushing this entry from the cache and trying
1511 tv = afs_GetVolume(&adp->fid, &treq, READ_LOCK);
1513 if (tv->states & VRO) {
1514 pass = 1; /* try this *once* */
1515 ObtainWriteLock(&afs_xcbhash, 495);
1516 afs_DequeueCallback(adp);
1517 /* re-stat to get later version */
1518 adp->states &= ~CStatd;
1519 ReleaseWriteLock(&afs_xcbhash);
1520 osi_dnlc_purgedp(adp);
1521 afs_PutVolume(tv, READ_LOCK);
1524 afs_PutVolume(tv, READ_LOCK);
1531 /* put the network buffer back, if need be */
1532 if (tname != aname && tname)
1533 osi_FreeLargeSpace(tname);
1536 /* Handle RENAME; only need to check rename "." */
1537 if (opflag == RENAME && wantparent && *ndp->ni_next == 0) {
1538 if (!FidCmp(&(tvc->fid), &(adp->fid))) {
1539 afs_PutVCache(*avcp);
1541 afs_PutFakeStat(&fakestate);
1542 return afs_CheckCode(EISDIR, &treq, 18);
1545 #endif /* AFS_OSF_ENV */
1548 afs_AddMarinerName(aname, tvc);
1550 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
1551 if (!(flags & AFS_LOOKUP_NOEVAL))
1552 /* Here we don't enter the name into the DNLC because we want the
1553 * evaluated mount dir to be there (the vcache for the mounted volume)
1554 * rather than the vc of the mount point itself. we can still find the
1555 * mount point's vc in the vcache by its fid. */
1556 #endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
1558 osi_dnlc_enter(adp, aname, tvc, &versionNo);
1560 #ifdef AFS_LINUX20_ENV
1561 /* So Linux inode cache is up to date. */
1562 code = afs_VerifyVCache(tvc, &treq);
1564 afs_PutFakeStat(&fakestate);
1565 return 0; /* can't have been any errors if hit and !code */
1572 code = afs_CheckCode(code, &treq, 19);
1574 /* If there is an error, make sure *avcp is null.
1575 * Alphas panic otherwise - defect 10719.
1580 afs_PutFakeStat(&fakestate);