+++ /dev/null
-/*
- * Copyright 2000, International Business Machines Corporation and others.
- * All Rights Reserved.
- *
- * This software has been released under the terms of the IBM Public
- * License. For details, see the LICENSE file in the top-level source
- * directory or online at http://www.openafs.org/dl/license10.html
- */
-
-/*
- * Implements:
- * afs_lookup
- * EvalMountPoint
- * afs_DoBulkStat
- */
-
-#include <afsconfig.h>
-#include "afs/param.h"
-
-RCSID
- ("$Header: /cvs/openafs/src/afs/VNOPS/afs_vnop_lookup.c,v 1.50.2.22 2008/08/26 14:02:14 shadow Exp $");
-
-#include "afs/sysincludes.h" /* Standard vendor system headers */
-#include "afsincludes.h" /* Afs-based standard headers */
-#include "afs/afs_stats.h" /* statistics */
-#include "afs/afs_cbqueue.h"
-#include "afs/nfsclient.h"
-#include "afs/exporter.h"
-#include "afs/afs_osidnlc.h"
-
-
-extern struct DirEntry *afs_dir_GetBlob();
-
-
-afs_int32 afs_bkvolpref = 0;
-afs_int32 afs_bulkStatsDone;
-static int bulkStatCounter = 0; /* counter for bulk stat seq. numbers */
-int afs_fakestat_enable = 0; /* 1: fakestat-all, 2: fakestat-crosscell */
-
-
-/* this would be faster if it did comparison as int32word, but would be
- * dependant on byte-order and alignment, and I haven't figured out
- * what "@sys" is in binary... */
-#define AFS_EQ_ATSYS(name) (((name)[0]=='@')&&((name)[1]=='s')&&((name)[2]=='y')&&((name)[3]=='s')&&(!(name)[4]))
-
-/* call under write lock, evaluate mvid field from a mt pt.
- * avc is the vnode of the mount point object; must be write-locked.
- * advc is the vnode of the containing directory (optional; if NULL and
- * EvalMountPoint succeeds, caller must initialize *avolpp->dotdot)
- * avolpp is where we return a pointer to the volume named by the mount pt, if success
- * areq is the identity of the caller.
- *
- * NOTE: this function returns a held volume structure in *volpp if it returns 0!
- */
-int
-EvalMountPoint(register struct vcache *avc, struct vcache *advc,
- struct volume **avolpp, register struct vrequest *areq)
-{
- afs_int32 code;
- struct volume *tvp = 0;
- struct VenusFid tfid;
- struct cell *tcell;
- char *cpos, *volnamep;
- char type, *buf;
- afs_int32 prefetch; /* 1=>None 2=>RO 3=>BK */
- afs_int32 mtptCell, assocCell = 0, hac = 0;
- afs_int32 samecell, roname, len;
-
- AFS_STATCNT(EvalMountPoint);
-#ifdef notdef
- if (avc->mvid && (avc->states & CMValid))
- return 0; /* done while racing */
-#endif
- *avolpp = NULL;
- code = afs_HandleLink(avc, areq);
- if (code)
- return code;
-
- /* Determine which cell and volume the mointpoint goes to */
- type = avc->linkData[0]; /* '#'=>Regular '%'=>RW */
- cpos = afs_strchr(&avc->linkData[1], ':'); /* if cell name present */
- if (cpos) {
- volnamep = cpos + 1;
- *cpos = 0;
- tcell = afs_GetCellByName(&avc->linkData[1], READ_LOCK);
- *cpos = ':';
- } else {
- volnamep = &avc->linkData[1];
- tcell = afs_GetCell(avc->fid.Cell, READ_LOCK);
- }
- if (!tcell)
- return ENODEV;
-
- mtptCell = tcell->cellNum; /* The cell for the mountpoint */
- if (tcell->lcellp) {
- hac = 1; /* has associated cell */
- assocCell = tcell->lcellp->cellNum; /* The associated cell */
- }
- afs_PutCell(tcell, READ_LOCK);
-
- /* Is volume name a "<n>.backup" or "<n>.readonly" name */
- len = strlen(volnamep);
- roname = ((len > 9) && (strcmp(&volnamep[len - 9], ".readonly") == 0))
- || ((len > 7) && (strcmp(&volnamep[len - 7], ".backup") == 0));
-
- /* When we cross mountpoint, do we stay in the same cell */
- samecell = (avc->fid.Cell == mtptCell) || (hac
- && (avc->fid.Cell ==
- assocCell));
-
- /* Decide whether to prefetch the BK, or RO. Also means we want the BK or
- * RO.
- * If this is a regular mountpoint with a RW volume name
- * - If BK preference is enabled AND we remain within the same cell AND
- * start from a BK volume, then we will want to prefetch the BK volume.
- * - If we cross a cell boundary OR start from a RO volume, then we will
- * want to prefetch the RO volume.
- */
- if ((type == '#') && !roname) {
- if (afs_bkvolpref && samecell && (avc->states & CBackup))
- prefetch = 3; /* Prefetch the BK */
- else if (!samecell || (avc->states & CRO))
- prefetch = 2; /* Prefetch the RO */
- else
- prefetch = 1; /* Do not prefetch */
- } else {
- prefetch = 1; /* Do not prefetch */
- }
-
- /* Get the volume struct. Unless this volume name has ".readonly" or
- * ".backup" in it, this will get the volume struct for the RW volume.
- * The RO volume will be prefetched if requested (but not returned).
- */
- tvp = afs_GetVolumeByName(volnamep, mtptCell, prefetch, areq, WRITE_LOCK);
-
- /* If no volume was found in this cell, try the associated linked cell */
- if (!tvp && hac && areq->volumeError) {
- tvp =
- afs_GetVolumeByName(volnamep, assocCell, prefetch, areq,
- WRITE_LOCK);
- }
-
- /* Still not found. If we are looking for the RO, then perhaps the RW
- * doesn't exist? Try adding ".readonly" to volname and look for that.
- * Don't know why we do this. Would have still found it in above call - jpm.
- */
- if (!tvp && (prefetch == 2) && len < AFS_SMALLOCSIZ - 10) {
- buf = (char *)osi_AllocSmallSpace(len + 10);
-
- strcpy(buf, volnamep);
- afs_strcat(buf, ".readonly");
-
- tvp = afs_GetVolumeByName(buf, mtptCell, 1, areq, WRITE_LOCK);
-
- /* Try the associated linked cell if failed */
- if (!tvp && hac && areq->volumeError) {
- tvp = afs_GetVolumeByName(buf, assocCell, 1, areq, WRITE_LOCK);
- }
- osi_FreeSmallSpace(buf);
- }
-
- if (!tvp)
- return ENODEV; /* Couldn't find the volume */
-
- /* Don't cross mountpoint from a BK to a BK volume */
- if ((avc->states & CBackup) && (tvp->states & VBackup)) {
- afs_PutVolume(tvp, WRITE_LOCK);
- return ENODEV;
- }
-
- /* If we want (prefetched) the BK and it exists, then drop the RW volume
- * and get the BK.
- * Otherwise, if we want (prefetched0 the RO and it exists, then drop the
- * RW volume and get the RO.
- * Otherwise, go with the RW.
- */
- if ((prefetch == 3) && tvp->backVol) {
- tfid.Fid.Volume = tvp->backVol; /* remember BK volume */
- tfid.Cell = tvp->cell;
- afs_PutVolume(tvp, WRITE_LOCK); /* release old volume */
- tvp = afs_GetVolume(&tfid, areq, WRITE_LOCK); /* get the new one */
- if (!tvp)
- return ENODEV; /* oops, can't do it */
- } else if ((prefetch >= 2) && tvp->roVol) {
- tfid.Fid.Volume = tvp->roVol; /* remember RO volume */
- tfid.Cell = tvp->cell;
- afs_PutVolume(tvp, WRITE_LOCK); /* release old volume */
- tvp = afs_GetVolume(&tfid, areq, WRITE_LOCK); /* get the new one */
- if (!tvp)
- return ENODEV; /* oops, can't do it */
- }
-
- if (avc->mvid == 0)
- avc->mvid =
- (struct VenusFid *)osi_AllocSmallSpace(sizeof(struct VenusFid));
- avc->mvid->Cell = tvp->cell;
- avc->mvid->Fid.Volume = tvp->volume;
- avc->mvid->Fid.Vnode = 1;
- avc->mvid->Fid.Unique = 1;
- avc->states |= CMValid;
-
- /* Used to: if the mount point is stored within a backup volume,
- * then we should only update the parent pointer information if
- * there's none already set, so as to avoid updating a volume's ..
- * info with something in an OldFiles directory.
- *
- * Next two lines used to be under this if:
- *
- * if (!(avc->states & CBackup) || tvp->dotdot.Fid.Volume == 0)
- *
- * Now: update mount point back pointer on every call, so that we handle
- * multiple mount points better. This way, when du tries to go back
- * via chddir(".."), it will end up exactly where it started, yet
- * cd'ing via a new path to a volume will reset the ".." pointer
- * to the new path.
- */
- tvp->mtpoint = avc->fid; /* setup back pointer to mtpoint */
- if (advc)
- tvp->dotdot = advc->fid;
-
- *avolpp = tvp;
- return 0;
-}
-
-/*
- * afs_InitFakeStat
- *
- * Must be called on an afs_fakestat_state object before calling
- * afs_EvalFakeStat or afs_PutFakeStat. Calling afs_PutFakeStat
- * without calling afs_EvalFakeStat is legal, as long as this
- * function is called.
- */
-void
-afs_InitFakeStat(struct afs_fakestat_state *state)
-{
- if (!afs_fakestat_enable)
- return;
-
- state->valid = 1;
- state->did_eval = 0;
- state->need_release = 0;
-}
-
-/*
- * afs_EvalFakeStat_int
- *
- * The actual implementation of afs_EvalFakeStat and afs_TryEvalFakeStat,
- * which is called by those wrapper functions.
- *
- * Only issues RPCs if canblock is non-zero.
- */
-static int
-afs_EvalFakeStat_int(struct vcache **avcp, struct afs_fakestat_state *state,
- struct vrequest *areq, int canblock)
-{
- struct vcache *tvc, *root_vp;
- struct volume *tvolp = NULL;
- int code = 0;
-
- if (!afs_fakestat_enable)
- return 0;
-
- osi_Assert(state->valid == 1);
- osi_Assert(state->did_eval == 0);
- state->did_eval = 1;
-
- tvc = *avcp;
- if (tvc->mvstat != 1)
- return 0;
-
- /* Is the call to VerifyVCache really necessary? */
- code = afs_VerifyVCache(tvc, areq);
- if (code)
- goto done;
- if (canblock) {
- ObtainWriteLock(&tvc->lock, 599);
- code = EvalMountPoint(tvc, NULL, &tvolp, areq);
- ReleaseWriteLock(&tvc->lock);
- if (code)
- goto done;
- if (tvolp) {
- tvolp->dotdot = tvc->fid;
- tvolp->dotdot.Fid.Vnode = tvc->parentVnode;
- tvolp->dotdot.Fid.Unique = tvc->parentUnique;
- }
- }
- if (tvc->mvid && (tvc->states & CMValid)) {
- if (!canblock) {
- afs_int32 retry;
-
- do {
- retry = 0;
- ObtainWriteLock(&afs_xvcache, 597);
- root_vp = afs_FindVCache(tvc->mvid, &retry, IS_WLOCK);
- if (root_vp && retry) {
- ReleaseWriteLock(&afs_xvcache);
- afs_PutVCache(root_vp);
- }
- } while (root_vp && retry);
- ReleaseWriteLock(&afs_xvcache);
- } else {
- root_vp = afs_GetVCache(tvc->mvid, areq, NULL, NULL);
- }
- if (!root_vp) {
- code = canblock ? ENOENT : 0;
- goto done;
- }
-#ifdef AFS_DARWIN80_ENV
- root_vp->m.Type = VDIR;
- AFS_GUNLOCK();
- code = afs_darwin_finalizevnode(root_vp, NULL, NULL, 0);
- AFS_GLOCK();
- if (code) goto done;
- vnode_ref(AFSTOV(root_vp));
-#endif
- if (tvolp) {
- /* Is this always kosher? Perhaps we should instead use
- * NBObtainWriteLock to avoid potential deadlock.
- */
- ObtainWriteLock(&root_vp->lock, 598);
- if (!root_vp->mvid)
- root_vp->mvid = osi_AllocSmallSpace(sizeof(struct VenusFid));
- *root_vp->mvid = tvolp->dotdot;
- ReleaseWriteLock(&root_vp->lock);
- }
- state->need_release = 1;
- state->root_vp = root_vp;
- *avcp = root_vp;
- code = 0;
- } else {
- code = canblock ? ENOENT : 0;
- }
-
- done:
- if (tvolp)
- afs_PutVolume(tvolp, WRITE_LOCK);
- return code;
-}
-
-/*
- * afs_EvalFakeStat
- *
- * Automatically does the equivalent of EvalMountPoint for vcache entries
- * which are mount points. Remembers enough state to properly release
- * the volume root vcache when afs_PutFakeStat() is called.
- *
- * State variable must be initialized by afs_InitFakeState() beforehand.
- *
- * Returns 0 when everything succeeds and *avcp points to the vcache entry
- * that should be used for the real vnode operation. Returns non-zero if
- * something goes wrong and the error code should be returned to the user.
- */
-int
-afs_EvalFakeStat(struct vcache **avcp, struct afs_fakestat_state *state,
- struct vrequest *areq)
-{
- return afs_EvalFakeStat_int(avcp, state, areq, 1);
-}
-
-/*
- * afs_TryEvalFakeStat
- *
- * Same as afs_EvalFakeStat, but tries not to talk to remote servers
- * and only evaluate the mount point if all the data is already in
- * local caches.
- *
- * Returns 0 if everything succeeds and *avcp points to a valid
- * vcache entry (possibly evaluated).
- */
-int
-afs_TryEvalFakeStat(struct vcache **avcp, struct afs_fakestat_state *state,
- struct vrequest *areq)
-{
- return afs_EvalFakeStat_int(avcp, state, areq, 0);
-}
-
-/*
- * afs_PutFakeStat
- *
- * Perform any necessary cleanup at the end of a vnode op, given that
- * afs_InitFakeStat was previously called with this state.
- */
-void
-afs_PutFakeStat(struct afs_fakestat_state *state)
-{
- if (!afs_fakestat_enable)
- return;
-
- osi_Assert(state->valid == 1);
- if (state->need_release)
- afs_PutVCache(state->root_vp);
- state->valid = 0;
-}
-
-int
-afs_ENameOK(register char *aname)
-{
- register int tlen;
-
- AFS_STATCNT(ENameOK);
- tlen = strlen(aname);
- if (tlen >= 4 && strcmp(aname + tlen - 4, "@sys") == 0)
- return 0;
- return 1;
-}
-
-static int
-afs_getsysname(register struct vrequest *areq, register struct vcache *adp,
- register char *bufp, int *num, char **sysnamelist[])
-{
- register struct unixuser *au;
- register afs_int32 error;
-
- AFS_STATCNT(getsysname);
-
- *sysnamelist = afs_sysnamelist;
-
- if (!afs_nfsexporter)
- strcpy(bufp, (*sysnamelist)[0]);
- else {
- au = afs_GetUser(areq->uid, adp->fid.Cell, 0);
- if (au->exporter) {
- error = EXP_SYSNAME(au->exporter, (char *)0, sysnamelist, num);
- if (error) {
- strcpy(bufp, "@sys");
- afs_PutUser(au, 0);
- return -1;
- } else {
- strcpy(bufp, (*sysnamelist)[0]);
- }
- } else
- strcpy(bufp, afs_sysname);
- afs_PutUser(au, 0);
- }
- return 0;
-}
-
-void
-Check_AtSys(register struct vcache *avc, const char *aname,
- struct sysname_info *state, struct vrequest *areq)
-{
- int num = 0;
- char **sysnamelist[MAXNUMSYSNAMES];
-
- if (AFS_EQ_ATSYS(aname)) {
- state->offset = 0;
- state->name = (char *)osi_AllocLargeSpace(AFS_SMALLOCSIZ);
- state->allocked = 1;
- state->index =
- afs_getsysname(areq, avc, state->name, &num, sysnamelist);
- } else {
- state->offset = -1;
- state->allocked = 0;
- state->index = 0;
- state->name = (char *)aname;
- }
-}
-
-int
-Next_AtSys(register struct vcache *avc, struct vrequest *areq,
- struct sysname_info *state)
-{
- int num = afs_sysnamecount;
- char **sysnamelist[MAXNUMSYSNAMES];
-
- if (state->index == -1)
- return 0; /* No list */
-
- /* Check for the initial state of aname != "@sys" in Check_AtSys */
- if (state->offset == -1 && state->allocked == 0) {
- register char *tname;
-
- /* Check for .*@sys */
- for (tname = state->name; *tname; tname++)
- /*Move to the end of the string */ ;
-
- if ((tname > state->name + 4) && (AFS_EQ_ATSYS(tname - 4))) {
- state->offset = (tname - 4) - state->name;
- tname = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
- strncpy(tname, state->name, state->offset);
- state->name = tname;
- state->allocked = 1;
- num = 0;
- state->index =
- afs_getsysname(areq, avc, state->name + state->offset, &num,
- sysnamelist);
- return 1;
- } else
- return 0; /* .*@sys doesn't match either */
- } else {
- register struct unixuser *au;
- register afs_int32 error;
-
- *sysnamelist = afs_sysnamelist;
-
- if (afs_nfsexporter) {
- au = afs_GetUser(areq->uid, avc->fid.Cell, 0);
- if (au->exporter) {
- error =
- EXP_SYSNAME(au->exporter, (char *)0, sysnamelist, &num);
- if (error) {
- return 0;
- }
- }
- afs_PutUser(au, 0);
- }
- if (++(state->index) >= num || !(*sysnamelist)[(unsigned int)state->index])
- return 0; /* end of list */
- }
- strcpy(state->name + state->offset, (*sysnamelist)[(unsigned int)state->index]);
- return 1;
-}
-
-extern int BlobScan(struct dcache * afile, afs_int32 ablob);
-
-/* called with an unlocked directory and directory cookie. Areqp
- * describes who is making the call.
- * Scans the next N (about 30, typically) directory entries, and does
- * a bulk stat call to stat them all.
- *
- * Must be very careful when merging in RPC responses, since we dont
- * want to overwrite newer info that was added by a file system mutating
- * call that ran concurrently with our bulk stat call.
- *
- * We do that, as described below, by not merging in our info (always
- * safe to skip the merge) if the status info is valid in the vcache entry.
- *
- * If adapt ever implements the bulk stat RPC, then this code will need to
- * ensure that vcaches created for failed RPC's to older servers have the
- * CForeign bit set.
- */
-static struct vcache *BStvc = NULL;
-
-int
-afs_DoBulkStat(struct vcache *adp, long dirCookie, struct vrequest *areqp)
-{
- int nentries; /* # of entries to prefetch */
- int nskip; /* # of slots in the LRU queue to skip */
- struct vcache *lruvcp; /* vcache ptr of our goal pos in LRU queue */
- struct dcache *dcp; /* chunk containing the dir block */
- char *statMemp; /* status memory block */
- char *cbfMemp; /* callback and fid memory block */
- afs_size_t temp; /* temp for holding chunk length, &c. */
- struct AFSFid *fidsp; /* file IDs were collecting */
- struct AFSCallBack *cbsp; /* call back pointers */
- struct AFSCallBack *tcbp; /* temp callback ptr */
- struct AFSFetchStatus *statsp; /* file status info */
- struct AFSVolSync volSync; /* vol sync return info */
- struct vcache *tvcp; /* temp vcp */
- struct afs_q *tq; /* temp queue variable */
- AFSCBFids fidParm; /* file ID parm for bulk stat */
- AFSBulkStats statParm; /* stat info parm for bulk stat */
- int fidIndex = 0; /* which file were stating */
- struct conn *tcp = 0; /* conn for call */
- AFSCBs cbParm; /* callback parm for bulk stat */
- struct server *hostp = 0; /* host we got callback from */
- long startTime; /* time we started the call,
- * for callback expiration base
- */
- afs_size_t statSeqNo = 0; /* Valued of file size to detect races */
- int code; /* error code */
- long newIndex; /* new index in the dir */
- struct DirEntry *dirEntryp; /* dir entry we are examining */
- int i;
- struct VenusFid afid; /* file ID we are using now */
- struct VenusFid tfid; /* another temp. file ID */
- afs_int32 retry; /* handle low-level SGI MP race conditions */
- long volStates; /* flags from vol structure */
- struct volume *volp = 0; /* volume ptr */
- struct VenusFid dotdot;
- int flagIndex = 0; /* First file with bulk fetch flag set */
- int inlinebulk = 0; /* Did we use InlineBulk RPC or not? */
- XSTATS_DECLS;
-#ifdef AFS_DARWIN80_ENV
- panic("bulkstatus doesn't work on AFS_DARWIN80_ENV. don't call it");
-#endif
- /* first compute some basic parameters. We dont want to prefetch more
- * than a fraction of the cache in any given call, and we want to preserve
- * a portion of the LRU queue in any event, so as to avoid thrashing
- * the entire stat cache (we will at least leave some of it alone).
- * presently dont stat more than 1/8 the cache in any one call. */
- nentries = afs_cacheStats / 8;
-
- /* dont bother prefetching more than one calls worth of info */
- if (nentries > AFSCBMAX)
- nentries = AFSCBMAX;
-
- /* heuristic to make sure that things fit in 4K. This means that
- * we shouldnt make it any bigger than 47 entries. I am typically
- * going to keep it a little lower, since we don't want to load
- * too much of the stat cache.
- */
- if (nentries > 30)
- nentries = 30;
-
- /* now, to reduce the stack size, well allocate two 4K blocks,
- * one for fids and callbacks, and one for stat info. Well set
- * up our pointers to the memory from there, too.
- */
- statMemp = osi_AllocLargeSpace(nentries * sizeof(AFSFetchStatus));
- statsp = (struct AFSFetchStatus *)statMemp;
- cbfMemp =
- osi_AllocLargeSpace(nentries *
- (sizeof(AFSCallBack) + sizeof(AFSFid)));
- fidsp = (AFSFid *) cbfMemp;
- cbsp = (AFSCallBack *) (cbfMemp + nentries * sizeof(AFSFid));
-
- /* next, we must iterate over the directory, starting from the specified
- * cookie offset (dirCookie), and counting out nentries file entries.
- * We skip files that already have stat cache entries, since we
- * dont want to bulk stat files that are already in the cache.
- */
- tagain:
- code = afs_VerifyVCache(adp, areqp);
- if (code)
- goto done2;
-
- dcp = afs_GetDCache(adp, (afs_size_t) 0, areqp, &temp, &temp, 1);
- if (!dcp) {
- code = ENOENT;
- goto done2;
- }
-
- /* lock the directory cache entry */
- ObtainReadLock(&adp->lock);
- ObtainReadLock(&dcp->lock);
-
- /*
- * Make sure that the data in the cache is current. There are two
- * cases we need to worry about:
- * 1. The cache data is being fetched by another process.
- * 2. The cache data is no longer valid
- */
- while ((adp->states & CStatd)
- && (dcp->dflags & DFFetching)
- && hsame(adp->m.DataVersion, dcp->f.versionNo)) {
- afs_Trace4(afs_iclSetp, CM_TRACE_DCACHEWAIT, ICL_TYPE_STRING,
- __FILE__, ICL_TYPE_INT32, __LINE__, ICL_TYPE_POINTER, dcp,
- ICL_TYPE_INT32, dcp->dflags);
- ReleaseReadLock(&dcp->lock);
- ReleaseReadLock(&adp->lock);
- afs_osi_Sleep(&dcp->validPos);
- ObtainReadLock(&adp->lock);
- ObtainReadLock(&dcp->lock);
- }
- if (!(adp->states & CStatd)
- || !hsame(adp->m.DataVersion, dcp->f.versionNo)) {
- ReleaseReadLock(&dcp->lock);
- ReleaseReadLock(&adp->lock);
- afs_PutDCache(dcp);
- goto tagain;
- }
-
- /* Generate a sequence number so we can tell whether we should
- * store the attributes when processing the response. This number is
- * stored in the file size when we set the CBulkFetching bit. If the
- * CBulkFetching is still set and this value hasn't changed, then
- * we know we were the last to set CBulkFetching bit for this file,
- * and it is safe to set the status information for this file.
- */
- statSeqNo = bulkStatCounter++;
-
- /* now we have dir data in the cache, so scan the dir page */
- fidIndex = 0;
- flagIndex = 0;
- while (1) { /* Should probably have some constant bound */
- /* look for first safe entry to examine in the directory. BlobScan
- * looks for a the 1st allocated dir after the dirCookie slot.
- */
- newIndex = BlobScan(dcp, (dirCookie >> 5));
- if (newIndex == 0)
- break;
-
- /* remember the updated directory cookie */
- dirCookie = newIndex << 5;
-
- /* get a ptr to the dir entry */
- dirEntryp =
- (struct DirEntry *)afs_dir_GetBlob(dcp, newIndex);
- if (!dirEntryp)
- break;
-
- /* dont copy more than we have room for */
- if (fidIndex >= nentries) {
- DRelease((struct buffer *)dirEntryp, 0);
- break;
- }
-
- /* now, if the dir entry looks good, copy it out to our list. Vnode
- * 0 means deleted, although it should also be free were it deleted.
- */
- if (dirEntryp->fid.vnode != 0) {
- /* dont copy entries we have in our cache. This check will
- * also make us skip "." and probably "..", unless it has
- * disappeared from the cache since we did our namei call.
- */
- tfid.Cell = adp->fid.Cell;
- tfid.Fid.Volume = adp->fid.Fid.Volume;
- tfid.Fid.Vnode = ntohl(dirEntryp->fid.vnode);
- tfid.Fid.Unique = ntohl(dirEntryp->fid.vunique);
- do {
- retry = 0;
- ObtainWriteLock(&afs_xvcache, 130);
- tvcp = afs_FindVCache(&tfid, &retry, IS_WLOCK /* no stats | LRU */ );
- if (tvcp && retry) {
- ReleaseWriteLock(&afs_xvcache);
- afs_PutVCache(tvcp);
- }
- } while (tvcp && retry);
- if (!tvcp) { /* otherwise, create manually */
- tvcp = afs_NewVCache(&tfid, hostp);
- if (tvcp)
- {
- ObtainWriteLock(&tvcp->lock, 505);
- ReleaseWriteLock(&afs_xvcache);
- afs_RemoveVCB(&tfid);
- ReleaseWriteLock(&tvcp->lock);
- } else {
- ReleaseWriteLock(&afs_xvcache);
- }
- } else {
- ReleaseWriteLock(&afs_xvcache);
- }
- if (!tvcp)
- {
- DRelease((struct buffer *)dirEntryp, 0);
- ReleaseReadLock(&dcp->lock);
- ReleaseReadLock(&adp->lock);
- afs_PutDCache(dcp);
- goto done; /* can happen if afs_NewVCache fails */
- }
-
-#ifdef AFS_DARWIN80_ENV
- if (tvcp->states & CVInit) {
- /* XXX don't have status yet, so creating the vnode is
- not yet useful. we would get CDeadVnode set, and the
- upcoming PutVCache will cause the vcache to be flushed &
- freed, which in turn means the bulkstatus results won't
- be used */
- }
-#endif
- /* WARNING: afs_DoBulkStat uses the Length field to store a
- * sequence number for each bulk status request. Under no
- * circumstances should afs_DoBulkStat store a sequence number
- * if the new length will be ignored when afs_ProcessFS is
- * called with new stats. */
-#ifdef AFS_SGI_ENV
- if (!(tvcp->states & (CStatd | CBulkFetching))
- && (tvcp->execsOrWriters <= 0)
- && !afs_DirtyPages(tvcp)
- && !AFS_VN_MAPPED((vnode_t *) tvcp))
-#else
- if (!(tvcp->states & (CStatd | CBulkFetching))
- && (tvcp->execsOrWriters <= 0)
- && !afs_DirtyPages(tvcp))
-#endif
-
- {
- /* this entry doesnt exist in the cache, and is not
- * already being fetched by someone else, so add it to the
- * list of file IDs to obtain.
- *
- * We detect a callback breaking race condition by checking the
- * CBulkFetching state bit and the value in the file size.
- * It is safe to set the status only if the CBulkFetching
- * flag is still set and the value in the file size does
- * not change.
- *
- * Don't fetch status for dirty files. We need to
- * preserve the value of the file size. We could
- * flush the pages, but it wouldn't be worthwhile.
- */
- memcpy((char *)(fidsp + fidIndex), (char *)&tfid.Fid,
- sizeof(*fidsp));
- tvcp->states |= CBulkFetching;
- tvcp->m.Length = statSeqNo;
- fidIndex++;
- }
- afs_PutVCache(tvcp);
- }
-
- /* if dir vnode has non-zero entry */
- /* move to the next dir entry by adding in the # of entries
- * used by this dir entry.
- */
- temp = afs_dir_NameBlobs(dirEntryp->name) << 5;
- DRelease((struct buffer *)dirEntryp, 0);
- if (temp <= 0)
- break;
- dirCookie += temp;
- } /* while loop over all dir entries */
-
- /* now release the dir lock and prepare to make the bulk RPC */
- ReleaseReadLock(&dcp->lock);
- ReleaseReadLock(&adp->lock);
-
- /* release the chunk */
- afs_PutDCache(dcp);
-
- /* dont make a null call */
- if (fidIndex == 0)
- goto done;
-
- do {
- /* setup the RPC parm structures */
- fidParm.AFSCBFids_len = fidIndex;
- fidParm.AFSCBFids_val = fidsp;
- statParm.AFSBulkStats_len = fidIndex;
- statParm.AFSBulkStats_val = statsp;
- cbParm.AFSCBs_len = fidIndex;
- cbParm.AFSCBs_val = cbsp;
-
- /* start the timer; callback expirations are relative to this */
- startTime = osi_Time();
-
- tcp = afs_Conn(&adp->fid, areqp, SHARED_LOCK);
- if (tcp) {
- hostp = tcp->srvr->server;
- XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_BULKSTATUS);
- RX_AFS_GUNLOCK();
-
- if (!(tcp->srvr->server->flags & SNO_INLINEBULK)) {
- code =
- RXAFS_InlineBulkStatus(tcp->id, &fidParm, &statParm,
- &cbParm, &volSync);
- if (code == RXGEN_OPCODE) {
- tcp->srvr->server->flags |= SNO_INLINEBULK;
- inlinebulk = 0;
- code =
- RXAFS_BulkStatus(tcp->id, &fidParm, &statParm,
- &cbParm, &volSync);
- } else
- inlinebulk = 1;
- } else {
- inlinebulk = 0;
- code =
- RXAFS_BulkStatus(tcp->id, &fidParm, &statParm, &cbParm,
- &volSync);
- }
- RX_AFS_GLOCK();
- XSTATS_END_TIME;
- } else
- code = -1;
- } while (afs_Analyze
- (tcp, code, &adp->fid, areqp, AFS_STATS_FS_RPCIDX_BULKSTATUS,
- SHARED_LOCK, NULL));
-
- /* now, if we didnt get the info, bail out. */
- if (code)
- goto done;
-
- /* we need vol flags to create the entries properly */
- dotdot.Fid.Volume = 0;
- volp = afs_GetVolume(&adp->fid, areqp, READ_LOCK);
- if (volp) {
- volStates = volp->states;
- if (volp->dotdot.Fid.Volume != 0)
- dotdot = volp->dotdot;
- } else
- volStates = 0;
-
- /* find the place to merge the info into We do this by skipping
- * nskip entries in the LRU queue. The more we skip, the more
- * we preserve, since the head of the VLRU queue is the most recently
- * referenced file.
- */
- reskip:
- nskip = afs_cacheStats / 2; /* preserved fraction of the cache */
- ObtainReadLock(&afs_xvcache);
- if (QEmpty(&VLRU)) {
- /* actually a serious error, probably should panic. Probably will
- * panic soon, oh well. */
- ReleaseReadLock(&afs_xvcache);
- afs_warnuser("afs_DoBulkStat: VLRU empty!");
- goto done;
- }
- if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
- refpanic("Bulkstat VLRU inconsistent");
- }
- for (tq = VLRU.next; tq != &VLRU; tq = QNext(tq)) {
- if (--nskip <= 0)
- break;
- else if (QNext(QPrev(tq)) != tq) {
- BStvc = QTOV(tq);
- refpanic("BulkStat VLRU inconsistent");
- }
- }
- if (tq != &VLRU)
- lruvcp = QTOV(tq);
- else
- lruvcp = QTOV(VLRU.next);
-
- /* now we have to hold this entry, so that it does not get moved
- * into the free list while we're running. It could still get
- * moved within the lru queue, but hopefully that will be rare; it
- * doesn't hurt nearly as much.
- */
- retry = 0;
- osi_vnhold(lruvcp, &retry);
- ReleaseReadLock(&afs_xvcache); /* could be read lock */
- if (retry)
- goto reskip;
-
- /* otherwise, merge in the info. We have to be quite careful here,
- * since we need to ensure that we don't merge old info over newer
- * stuff in a stat cache entry. We're very conservative here: we don't
- * do the merge at all unless we ourselves create the stat cache
- * entry. That's pretty safe, and should work pretty well, since we
- * typically expect to do the stat cache creation ourselves.
- *
- * We also have to take into account racing token revocations.
- */
- for (i = 0; i < fidIndex; i++) {
- if ((&statsp[i])->errorCode)
- continue;
- afid.Cell = adp->fid.Cell;
- afid.Fid.Volume = adp->fid.Fid.Volume;
- afid.Fid.Vnode = fidsp[i].Vnode;
- afid.Fid.Unique = fidsp[i].Unique;
- do {
- retry = 0;
- ObtainReadLock(&afs_xvcache);
- tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
- ReleaseReadLock(&afs_xvcache);
- } while (tvcp && retry);
-
- /* The entry may no longer exist */
- if (tvcp == NULL) {
- continue;
- }
-
- /* now we have the entry held, but we need to fill it in */
- ObtainWriteLock(&tvcp->lock, 131);
-
- /* if CBulkFetching is not set, or if the file size no longer
- * matches the value we placed there when we set the CBulkFetching
- * flag, then someone else has done something with this node,
- * and we may not have the latest status information for this
- * file. Leave the entry alone.
- */
- if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
- flagIndex++;
- ReleaseWriteLock(&tvcp->lock);
- afs_PutVCache(tvcp);
- continue;
- }
-
- /* now copy ".." entry back out of volume structure, if necessary */
- if (tvcp->mvstat == 2 && (dotdot.Fid.Volume != 0)) {
- if (!tvcp->mvid)
- tvcp->mvid = (struct VenusFid *)
- osi_AllocSmallSpace(sizeof(struct VenusFid));
- *tvcp->mvid = dotdot;
- }
-
- ObtainWriteLock(&afs_xvcache, 132);
- if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
- refpanic("Bulkstat VLRU inconsistent2");
- }
- if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
- || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
- refpanic("Bulkstat VLRU inconsistent4");
- }
- if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
- || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
- refpanic("Bulkstat VLRU inconsistent5");
- }
-
- if (tvcp != lruvcp) { /* if they are == don't move it, don't corrupt vlru */
- QRemove(&tvcp->vlruq);
- QAdd(&lruvcp->vlruq, &tvcp->vlruq);
- }
-
- if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
- refpanic("Bulkstat VLRU inconsistent3");
- }
- if ((QNext(QPrev(&tvcp->vlruq)) != &tvcp->vlruq)
- || (QPrev(QNext(&tvcp->vlruq)) != &tvcp->vlruq)) {
- refpanic("Bulkstat VLRU inconsistent5");
- }
- if ((QNext(QPrev(&lruvcp->vlruq)) != &lruvcp->vlruq)
- || (QPrev(QNext(&lruvcp->vlruq)) != &lruvcp->vlruq)) {
- refpanic("Bulkstat VLRU inconsistent6");
- }
- ReleaseWriteLock(&afs_xvcache);
-
- ObtainWriteLock(&afs_xcbhash, 494);
-
- /* We need to check the flags again. We may have missed
- * something while we were waiting for a lock.
- */
- if (!(tvcp->states & CBulkFetching) || (tvcp->m.Length != statSeqNo)) {
- flagIndex++;
- ReleaseWriteLock(&tvcp->lock);
- ReleaseWriteLock(&afs_xcbhash);
- afs_PutVCache(tvcp);
- continue;
- }
-
- /* now merge in the resulting status back into the vnode.
- * We only do this if the entry looks clear.
- */
- afs_ProcessFS(tvcp, &statsp[i], areqp);
-#if defined(AFS_LINUX22_ENV)
- afs_fill_inode(AFSTOV(tvcp), NULL); /* reset inode operations */
-#endif
-
- /* do some accounting for bulk stats: mark this entry as
- * loaded, so we can tell if we use it before it gets
- * recycled.
- */
- tvcp->states |= CBulkStat;
- tvcp->states &= ~CBulkFetching;
- flagIndex++;
- afs_bulkStatsDone++;
-
- /* merge in vol info */
- if (volStates & VRO)
- tvcp->states |= CRO;
- if (volStates & VBackup)
- tvcp->states |= CBackup;
- if (volStates & VForeign)
- tvcp->states |= CForeign;
-
- /* merge in the callback info */
- tvcp->states |= CTruth;
-
- /* get ptr to the callback we are interested in */
- tcbp = cbsp + i;
-
- if (tcbp->ExpirationTime != 0) {
- tvcp->cbExpires = tcbp->ExpirationTime + startTime;
- tvcp->callback = hostp;
- tvcp->states |= CStatd;
- afs_QueueCallback(tvcp, CBHash(tcbp->ExpirationTime), volp);
- } else if (tvcp->states & CRO) {
- /* ordinary callback on a read-only volume -- AFS 3.2 style */
- tvcp->cbExpires = 3600 + startTime;
- tvcp->callback = hostp;
- tvcp->states |= CStatd;
- afs_QueueCallback(tvcp, CBHash(3600), volp);
- } else {
- tvcp->callback = 0;
- tvcp->states &= ~(CStatd | CUnique);
- afs_DequeueCallback(tvcp);
- if ((tvcp->states & CForeign) || (vType(tvcp) == VDIR))
- osi_dnlc_purgedp(tvcp); /* if it (could be) a directory */
- }
- ReleaseWriteLock(&afs_xcbhash);
-
- ReleaseWriteLock(&tvcp->lock);
- /* finally, we're done with the entry */
- afs_PutVCache(tvcp);
- } /* for all files we got back */
-
- /* finally return the pointer into the LRU queue */
- afs_PutVCache(lruvcp);
-
- done:
- /* Be sure to turn off the CBulkFetching flags */
- for (i = flagIndex; i < fidIndex; i++) {
- afid.Cell = adp->fid.Cell;
- afid.Fid.Volume = adp->fid.Fid.Volume;
- afid.Fid.Vnode = fidsp[i].Vnode;
- afid.Fid.Unique = fidsp[i].Unique;
- do {
- retry = 0;
- ObtainReadLock(&afs_xvcache);
- tvcp = afs_FindVCache(&afid, &retry, 0 /* !stats&!lru */ );
- ReleaseReadLock(&afs_xvcache);
- } while (tvcp && retry);
- if (tvcp != NULL && (tvcp->states & CBulkFetching)
- && (tvcp->m.Length == statSeqNo)) {
- tvcp->states &= ~CBulkFetching;
- }
- if (tvcp != NULL) {
- afs_PutVCache(tvcp);
- }
- }
- if (volp)
- afs_PutVolume(volp, READ_LOCK);
-
- /* If we did the InlineBulk RPC pull out the return code */
- if (inlinebulk) {
- if ((&statsp[0])->errorCode) {
- afs_Analyze(tcp, (&statsp[0])->errorCode, &adp->fid, areqp,
- AFS_STATS_FS_RPCIDX_BULKSTATUS, SHARED_LOCK, NULL);
- code = (&statsp[0])->errorCode;
- }
- } else {
- code = 0;
- }
- done2:
- osi_FreeLargeSpace(statMemp);
- osi_FreeLargeSpace(cbfMemp);
- return code;
-}
-
-/* was: (AFS_DEC_ENV) || defined(AFS_OSF30_ENV) || defined(AFS_NCR_ENV) */
-#ifdef AFS_DARWIN80_ENV
-#define AFSDOBULK 0
-#else
-static int AFSDOBULK = 1;
-#endif
-
-int
-#ifdef AFS_OSF_ENV
-afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred, int opflag, int wantparent)
-#elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
-afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct pathname *pnp, int flags, struct vnode *rdir, struct AFS_UCRED *acred)
-#elif defined(UKERNEL)
-afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred, int flags)
-#else
-afs_lookup(OSI_VC_DECL(adp), char *aname, struct vcache **avcp, struct AFS_UCRED *acred)
-#endif
-{
- struct vrequest treq;
- char *tname = NULL;
- register struct vcache *tvc = 0;
- register afs_int32 code;
- register afs_int32 bulkcode = 0;
- int pass = 0, hit = 0;
- int force_eval = afs_fakestat_enable ? 0 : 1;
- long dirCookie;
- extern afs_int32 afs_mariner; /*Writing activity to log? */
- afs_hyper_t versionNo;
- int no_read_access = 0;
- struct sysname_info sysState; /* used only for @sys checking */
- int dynrootRetry = 1;
- struct afs_fakestat_state fakestate;
- int tryEvalOnly = 0;
- OSI_VC_CONVERT(adp);
-
- AFS_STATCNT(afs_lookup);
- afs_InitFakeStat(&fakestate);
-
- if ((code = afs_InitReq(&treq, acred)))
- goto done;
-
-#ifdef AFS_OSF_ENV
- ndp->ni_dvp = AFSTOV(adp);
-#endif /* AFS_OSF_ENV */
-
- if (afs_fakestat_enable && adp->mvstat == 1) {
- if (strcmp(aname, ".directory") == 0)
- tryEvalOnly = 1;
- }
-
-#if defined(AFS_DARWIN_ENV)
- /* Workaround for MacOSX Finder, which tries to look for
- * .DS_Store and Contents under every directory.
- */
- if (afs_fakestat_enable && adp->mvstat == 1) {
- if (strcmp(aname, ".DS_Store") == 0)
- tryEvalOnly = 1;
- if (strcmp(aname, "Contents") == 0)
- tryEvalOnly = 1;
- }
-#endif
-
- if (tryEvalOnly)
- code = afs_TryEvalFakeStat(&adp, &fakestate, &treq);
- else
- code = afs_EvalFakeStat(&adp, &fakestate, &treq);
- if (tryEvalOnly && adp->mvstat == 1)
- code = ENOENT;
- if (code)
- goto done;
-
- *avcp = NULL; /* Since some callers don't initialize it */
-
- /* come back to here if we encounter a non-existent object in a read-only
- * volume's directory */
-
- redo:
- *avcp = NULL; /* Since some callers don't initialize it */
- bulkcode = 0;
-
- if (!(adp->states & CStatd)) {
- if ((code = afs_VerifyVCache2(adp, &treq))) {
- goto done;
- }
- } else
- code = 0;
-
- /* watch for ".." in a volume root */
- if (adp->mvstat == 2 && aname[0] == '.' && aname[1] == '.' && !aname[2]) {
- /* looking up ".." in root via special hacks */
- if (adp->mvid == (struct VenusFid *)0 || adp->mvid->Fid.Volume == 0) {
-#ifdef AFS_OSF_ENV
- extern struct vcache *afs_globalVp;
- if (adp == afs_globalVp) {
- struct vnode *rvp = AFSTOV(adp);
-/*
- ndp->ni_vp = rvp->v_vfsp->vfs_vnodecovered;
- ndp->ni_dvp = ndp->ni_vp;
- VN_HOLD(*avcp);
-*/
- code = ENODEV;
- goto done;
- }
-#endif
- code = ENODEV;
- goto done;
- }
- /* otherwise we have the fid here, so we use it */
- tvc = afs_GetVCache(adp->mvid, &treq, NULL, NULL);
- afs_Trace3(afs_iclSetp, CM_TRACE_GETVCDOTDOT, ICL_TYPE_FID, adp->mvid,
- ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32, code);
- *avcp = tvc;
- code = (tvc ? 0 : ENOENT);
- hit = 1;
- if (tvc && !VREFCOUNT_GT(tvc, 0)) {
- osi_Panic("TT1");
- }
- if (code) {
- /*printf("LOOKUP GETVCDOTDOT -> %d\n", code); */
- }
- goto done;
- }
-
- /* now check the access */
- if (treq.uid != adp->last_looker) {
- if (!afs_AccessOK(adp, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
- *avcp = NULL;
- code = EACCES;
- goto done;
- } else
- adp->last_looker = treq.uid;
- }
-
- /* Check for read access as well. We need read access in order to
- * stat files, but not to stat subdirectories. */
- if (!afs_AccessOK(adp, PRSFS_READ, &treq, CHECK_MODE_BITS))
- no_read_access = 1;
-
- /* special case lookup of ".". Can we check for it sooner in this code,
- * for instance, way up before "redo:" ??
- * I'm not fiddling with the LRUQ here, either, perhaps I should, or else
- * invent a lightweight version of GetVCache.
- */
- if (aname[0] == '.' && !aname[1]) { /* special case */
- ObtainReadLock(&afs_xvcache);
- osi_vnhold(adp, 0);
- ReleaseReadLock(&afs_xvcache);
-#ifdef AFS_DARWIN80_ENV
- vnode_get(AFSTOV(adp));
-#endif
- code = 0;
- *avcp = tvc = adp;
- hit = 1;
- if (adp && !VREFCOUNT_GT(adp, 0)) {
- osi_Panic("TT2");
- }
- goto done;
- }
-
- Check_AtSys(adp, aname, &sysState, &treq);
- tname = sysState.name;
-
- /* 1st Check_AtSys and lookup by tname is required here, for now,
- * because the dnlc is *not* told to remove entries for the parent
- * dir of file/dir op that afs_LocalHero likes, but dnlc is informed
- * if the cached entry for the parent dir is invalidated for a
- * non-local change.
- * Otherwise, we'd be able to do a dnlc lookup on an entry ending
- * w/@sys and know the dnlc was consistent with reality. */
- tvc = osi_dnlc_lookup(adp, tname, WRITE_LOCK);
- *avcp = tvc; /* maybe wasn't initialized, but it is now */
- if (tvc) {
- if (no_read_access && vType(tvc) != VDIR && vType(tvc) != VLNK) {
- /* need read access on dir to stat non-directory / non-link */
-#ifndef AFS_FBSD80_ENV
- afs_PutVCache(tvc);
-#endif
- *avcp = NULL;
- code = EACCES;
- goto done;
- }
-#ifdef AFS_LINUX22_ENV
- if (tvc->mvstat == 2) { /* we don't trust the dnlc for root vcaches */
- AFS_RELE(AFSTOV(tvc));
- *avcp = 0;
- } else {
- code = 0;
- hit = 1;
- goto done;
- }
-#else /* non - LINUX */
- code = 0;
- hit = 1;
- goto done;
-#endif /* linux22 */
- }
-
- { /* sub-block just to reduce stack usage */
- register struct dcache *tdc;
- afs_size_t dirOffset, dirLen;
- struct VenusFid tfid;
-
- /* now we have to lookup the next fid */
- tdc =
- afs_GetDCache(adp, (afs_size_t) 0, &treq, &dirOffset, &dirLen, 1);
- if (!tdc) {
- *avcp = NULL; /* redundant, but harmless */
- code = EIO;
- goto done;
- }
-
- /* now we will just call dir package with appropriate inode.
- * Dirs are always fetched in their entirety for now */
- ObtainReadLock(&adp->lock);
- ObtainReadLock(&tdc->lock);
-
- /*
- * Make sure that the data in the cache is current. There are two
- * cases we need to worry about:
- * 1. The cache data is being fetched by another process.
- * 2. The cache data is no longer valid
- */
- while ((adp->states & CStatd)
- && (tdc->dflags & DFFetching)
- && hsame(adp->m.DataVersion, tdc->f.versionNo)) {
- ReleaseReadLock(&tdc->lock);
- ReleaseReadLock(&adp->lock);
- afs_osi_Sleep(&tdc->validPos);
- ObtainReadLock(&adp->lock);
- ObtainReadLock(&tdc->lock);
- }
- if (!(adp->states & CStatd)
- || !hsame(adp->m.DataVersion, tdc->f.versionNo)) {
- ReleaseReadLock(&tdc->lock);
- ReleaseReadLock(&adp->lock);
- afs_PutDCache(tdc);
- if (tname && tname != aname)
- osi_FreeLargeSpace(tname);
- goto redo;
- }
-
- /* Save the version number for when we call osi_dnlc_enter */
- hset(versionNo, tdc->f.versionNo);
-
- /*
- * check for, and handle "@sys" if it's there. We should be able
- * to avoid the alloc and the strcpy with a little work, but it's
- * not pressing. If there aren't any remote users (ie, via the
- * NFS translator), we have a slightly easier job.
- * the faster way to do this is to check for *aname == '@' and if
- * it's there, check for @sys, otherwise, assume there's no @sys
- * then, if the lookup fails, check for .*@sys...
- */
- /* above now implemented by Check_AtSys and Next_AtSys */
-
- /* lookup the name in the appropriate dir, and return a cache entry
- * on the resulting fid */
- code =
- afs_dir_LookupOffset(tdc, sysState.name, &tfid.Fid,
- &dirCookie);
-
- /* If the first lookup doesn't succeed, maybe it's got @sys in the name */
- while (code == ENOENT && Next_AtSys(adp, &treq, &sysState))
- code =
- afs_dir_LookupOffset(tdc, sysState.name, &tfid.Fid,
- &dirCookie);
- tname = sysState.name;
-
- ReleaseReadLock(&tdc->lock);
- afs_PutDCache(tdc);
-
- if (code == ENOENT && afs_IsDynroot(adp) && dynrootRetry) {
- ReleaseReadLock(&adp->lock);
- dynrootRetry = 0;
- if (tname[0] == '.')
- afs_LookupAFSDB(tname + 1);
- else
- afs_LookupAFSDB(tname);
- if (tname && tname != aname)
- osi_FreeLargeSpace(tname);
- goto redo;
- } else {
- ReleaseReadLock(&adp->lock);
- }
-
- /* new fid has same cell and volume */
- tfid.Cell = adp->fid.Cell;
- tfid.Fid.Volume = adp->fid.Fid.Volume;
- afs_Trace4(afs_iclSetp, CM_TRACE_LOOKUP, ICL_TYPE_POINTER, adp,
- ICL_TYPE_STRING, tname, ICL_TYPE_FID, &tfid,
- ICL_TYPE_INT32, code);
-
- if (code) {
- if (code != ENOENT) {
- printf("LOOKUP dirLookupOff -> %d\n", code);
- }
- goto done;
- }
-
- /* prefetch some entries, if the dir is currently open. The variable
- * dirCookie tells us where to start prefetching from.
- */
- if (AFSDOBULK && adp->opens > 0 && !(adp->states & CForeign)
- && !afs_IsDynroot(adp)) {
- afs_int32 retry;
- /* if the entry is not in the cache, or is in the cache,
- * but hasn't been statd, then do a bulk stat operation.
- */
- do {
- retry = 0;
- ObtainReadLock(&afs_xvcache);
- tvc = afs_FindVCache(&tfid, &retry, 0 /* !stats,!lru */ );
- ReleaseReadLock(&afs_xvcache);
- } while (tvc && retry);
-
- if (!tvc || !(tvc->states & CStatd))
- bulkcode = afs_DoBulkStat(adp, dirCookie, &treq);
- else
- bulkcode = 0;
-
- /* if the vcache isn't usable, release it */
- if (tvc && !(tvc->states & CStatd)) {
-#ifndef AFS_FBSD80_ENV
- afs_PutVCache(tvc);
-#endif
- tvc = NULL;
- }
- } else {
- tvc = NULL;
- bulkcode = 0;
- }
-
- /* now get the status info, if we don't already have it */
- /* This is kind of weird, but we might wind up accidentally calling
- * RXAFS_Lookup because we happened upon a file which legitimately
- * has a 0 uniquifier. That is the result of allowing unique to wrap
- * to 0. This was fixed in AFS 3.4. For CForeign, Unique == 0 means that
- * the file has not yet been looked up.
- */
- if (!tvc) {
- afs_int32 cached = 0;
- if (!tfid.Fid.Unique && (adp->states & CForeign)) {
- tvc = afs_LookupVCache(&tfid, &treq, &cached, adp, tname);
- }
- if (!tvc && !bulkcode) { /* lookup failed or wasn't called */
- tvc = afs_GetVCache(&tfid, &treq, &cached, NULL);
- }
- } /* if !tvc */
- } /* sub-block just to reduce stack usage */
-
- if (tvc) {
- if (adp->states & CForeign)
- tvc->states |= CForeign;
- tvc->parentVnode = adp->fid.Fid.Vnode;
- tvc->parentUnique = adp->fid.Fid.Unique;
- tvc->states &= ~CBulkStat;
-
- if (afs_fakestat_enable == 2 && tvc->mvstat == 1) {
- ObtainSharedLock(&tvc->lock, 680);
- if (!tvc->linkData) {
- UpgradeSToWLock(&tvc->lock, 681);
- code = afs_HandleLink(tvc, &treq);
- ConvertWToRLock(&tvc->lock);
- } else {
- ConvertSToRLock(&tvc->lock);
- code = 0;
- }
- if (!code && !afs_strchr(tvc->linkData, ':'))
- force_eval = 1;
- ReleaseReadLock(&tvc->lock);
- }
- if (tvc->mvstat == 1 && (tvc->states & CMValid) && tvc->mvid != NULL)
- force_eval = 1; /* This is now almost for free, get it correct */
-
-#if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
- if (!(flags & AFS_LOOKUP_NOEVAL))
- /* don't eval mount points */
-#endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
- if (tvc->mvstat == 1 && force_eval) {
- /* a mt point, possibly unevaluated */
- struct volume *tvolp;
-
- ObtainWriteLock(&tvc->lock, 133);
- code = EvalMountPoint(tvc, adp, &tvolp, &treq);
- ReleaseWriteLock(&tvc->lock);
-
- if (code) {
-#ifndef AFS_FBSD80_ENV
- afs_PutVCache(tvc);
-#endif
- if (tvolp)
- afs_PutVolume(tvolp, WRITE_LOCK);
- goto done;
- }
-
- /* next, we want to continue using the target of the mt point */
- if (tvc->mvid && (tvc->states & CMValid)) {
- struct vcache *uvc;
- /* now lookup target, to set .. pointer */
- afs_Trace2(afs_iclSetp, CM_TRACE_LOOKUP1,
- ICL_TYPE_POINTER, tvc, ICL_TYPE_FID,
- &tvc->fid);
- uvc = tvc; /* remember for later */
-
- if (tvolp && (tvolp->states & VForeign)) {
- /* XXXX tvolp has ref cnt on but not locked! XXX */
- tvc =
- afs_GetRootVCache(tvc->mvid, &treq, NULL, tvolp);
- } else {
- tvc = afs_GetVCache(tvc->mvid, &treq, NULL, NULL);
- }
-#ifndef AFS_FBSD80_ENV
- afs_PutVCache(uvc); /* we're done with it */
-#endif
-
- if (!tvc) {
- code = ENOENT;
- if (tvolp) {
- afs_PutVolume(tvolp, WRITE_LOCK);
- }
- goto done;
- }
-
- /* now, if we came via a new mt pt (say because of a new
- * release of a R/O volume), we must reevaluate the ..
- * ptr to point back to the appropriate place */
- if (tvolp) {
- ObtainWriteLock(&tvc->lock, 134);
- if (tvc->mvid == NULL) {
- tvc->mvid = (struct VenusFid *)
- osi_AllocSmallSpace(sizeof(struct VenusFid));
- }
- /* setup backpointer */
- *tvc->mvid = tvolp->dotdot;
- ReleaseWriteLock(&tvc->lock);
- afs_PutVolume(tvolp, WRITE_LOCK);
- }
- } else {
-#ifndef AFS_FBSD80_ENV
- afs_PutVCache(tvc);
-#endif
- code = ENOENT;
- if (tvolp)
- afs_PutVolume(tvolp, WRITE_LOCK);
- goto done;
- }
- }
- *avcp = tvc;
- if (tvc && !VREFCOUNT_GT(tvc, 0)) {
- osi_Panic("TT3");
- }
- code = 0;
- } else {
- /* if we get here, we found something in a directory that couldn't
- * be located (a Multics "connection failure"). If the volume is
- * read-only, we try flushing this entry from the cache and trying
- * again. */
- if (pass == 0) {
- struct volume *tv;
- tv = afs_GetVolume(&adp->fid, &treq, READ_LOCK);
- if (tv) {
- if (tv->states & VRO) {
- pass = 1; /* try this *once* */
- ObtainWriteLock(&afs_xcbhash, 495);
- afs_DequeueCallback(adp);
- /* re-stat to get later version */
- adp->states &= ~CStatd;
- ReleaseWriteLock(&afs_xcbhash);
- osi_dnlc_purgedp(adp);
- afs_PutVolume(tv, READ_LOCK);
- goto redo;
- }
- afs_PutVolume(tv, READ_LOCK);
- }
- }
- code = ENOENT;
- }
-
- done:
- /* put the network buffer back, if need be */
- if (tname != aname && tname)
- osi_FreeLargeSpace(tname);
- if (code == 0) {
-#ifdef AFS_OSF_ENV
- /* Handle RENAME; only need to check rename "." */
- if (opflag == RENAME && wantparent && *ndp->ni_next == 0) {
- if (!FidCmp(&(tvc->fid), &(adp->fid))) {
- afs_PutVCache(*avcp);
- *avcp = NULL;
- afs_PutFakeStat(&fakestate);
- return afs_CheckCode(EISDIR, &treq, 18);
- }
- }
-#endif /* AFS_OSF_ENV */
-
- if (afs_mariner)
- afs_AddMarinerName(aname, tvc);
-
-#if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
- if (!(flags & AFS_LOOKUP_NOEVAL))
- /* Here we don't enter the name into the DNLC because we want the
- * evaluated mount dir to be there (the vcache for the mounted volume)
- * rather than the vc of the mount point itself. we can still find the
- * mount point's vc in the vcache by its fid. */
-#endif /* UKERNEL && AFS_WEB_ENHANCEMENTS */
- if (!hit && force_eval) {
- osi_dnlc_enter(adp, aname, tvc, &versionNo);
- } else {
-#ifdef AFS_LINUX20_ENV
- /* So Linux inode cache is up to date. */
- code = afs_VerifyVCache(tvc, &treq);
-#else
- afs_PutFakeStat(&fakestate);
- return 0; /* can't have been any errors if hit and !code */
-#endif
- }
- }
- if (bulkcode)
- code = bulkcode;
-
- code = afs_CheckCode(code, &treq, 19);
- if (code) {
- /* If there is an error, make sure *avcp is null.
- * Alphas panic otherwise - defect 10719.
- */
- *avcp = NULL;
- }
-
- afs_PutFakeStat(&fakestate);
- return code;
-}
projects / packages / o / openafs.git / commitdiff