--- /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