2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
19 * afs_FlushActiveVcaches
38 #include <afsconfig.h>
39 #include "../afs/param.h"
43 #include "../afs/sysincludes.h" /*Standard vendor system headers*/
44 #include "../afs/afsincludes.h" /*AFS-based standard headers*/
45 #include "../afs/afs_stats.h"
46 #include "../afs/afs_cbqueue.h"
47 #include "../afs/afs_osidnlc.h"
50 afs_int32 afs_maxvcount = 0; /* max number of vcache entries */
51 afs_int32 afs_vcount = 0; /* number of vcache in use now */
52 #if defined(AFS_OSF30_ENV)
53 extern int max_vnodes; /* number of total system vnodes */
55 extern int nvnode; /* number of total system vnodes */
58 extern int numvnodes; /* number vnodes in use now */
60 #endif /* AFS_OSF_ENV */
65 /* Imported variables */
66 extern struct server *afs_servers[NSERVERS];
67 extern afs_rwlock_t afs_xserver;
68 extern afs_rwlock_t afs_xcbhash;
69 extern struct vcache *afs_globalVp;
71 extern struct mount *afs_globalVFS;
72 extern struct vnodeops Afs_vnodeops;
73 #elif defined(AFS_DARWIN_ENV) || defined(AFS_FBSD_ENV)
74 extern struct mount *afs_globalVFS;
76 extern struct vfs *afs_globalVFS;
77 #endif /* AFS_OSF_ENV */
78 #if defined(AFS_DUX40_ENV)
79 extern struct vfs_ubcops afs_ubcops;
82 extern struct vnodeops Afs_vnodeops;
86 #endif /* AFS_SGI64_ENV */
88 /* Exported variables */
89 afs_rwlock_t afs_xvcache; /*Lock: alloc new stat cache entries*/
90 afs_lock_t afs_xvcb; /*Lock: fids on which there are callbacks*/
91 struct vcache *freeVCList; /*Free list for stat cache entries*/
92 struct vcache *Initial_freeVCList; /*Initial list for above*/
93 struct afs_q VLRU; /*vcache LRU*/
94 afs_int32 vcachegen = 0;
95 unsigned int afs_paniconwarn = 0;
96 struct vcache *afs_vhashT[VCSIZE];
97 afs_int32 afs_bulkStatsLost;
98 int afs_norefpanic = 0;
100 /* Forward declarations */
101 static afs_int32 afs_QueueVCB(struct vcache *avc);
108 * Flush the given vcache entry.
111 * avc : Pointer to vcache entry to flush.
112 * slept : Pointer to int to set 1 if we sleep/drop locks, 0 if we don't.
115 * afs_xvcache lock must be held for writing upon entry to
116 * prevent people from changing the vrefCount field, and to
117 * protect the lruq and hnext fields.
118 * LOCK: afs_FlushVCache afs_xvcache W
119 * REFCNT: vcache ref count must be zero on entry except for osf1
120 * RACE: lock is dropped and reobtained, permitting race in caller
123 int afs_FlushVCache(struct vcache *avc, int *slept)
124 { /*afs_FlushVCache*/
126 register afs_int32 i, code;
127 register struct vcache **uvc, *wvc, *tvc;
130 AFS_STATCNT(afs_FlushVCache);
131 afs_Trace2(afs_iclSetp, CM_TRACE_FLUSHV, ICL_TYPE_POINTER, avc,
132 ICL_TYPE_INT32, avc->states);
135 VN_LOCK(AFSTOV(avc));
139 code = osi_VM_FlushVCache(avc, slept);
143 if (avc->states & CVFlushed) {
147 if (avc->nextfree || !avc->vlruq.prev || !avc->vlruq.next) { /* qv afs.h */
148 refpanic ("LRU vs. Free inconsistency");
150 avc->states |= CVFlushed;
151 /* pull the entry out of the lruq and put it on the free list */
152 QRemove(&avc->vlruq);
153 avc->vlruq.prev = avc->vlruq.next = (struct afs_q *) 0;
155 /* keep track of # of files that we bulk stat'd, but never used
156 * before they got recycled.
158 if (avc->states & CBulkStat)
161 /* remove entry from the hash chain */
162 i = VCHash(&avc->fid);
163 uvc = &afs_vhashT[i];
164 for(wvc = *uvc; wvc; uvc = &wvc->hnext, wvc = *uvc) {
167 avc->hnext = (struct vcache *) NULL;
171 if (!wvc) osi_Panic("flushvcache"); /* not in correct hash bucket */
172 if (avc->mvid) osi_FreeSmallSpace(avc->mvid);
173 avc->mvid = (struct VenusFid*)0;
175 afs_osi_Free(avc->linkData, strlen(avc->linkData)+1);
176 avc->linkData = NULL;
178 afs_FreeAllAxs(&(avc->Access));
180 /* we can't really give back callbacks on RO files, since the
181 * server only tracks them on a per-volume basis, and we don't
182 * know whether we still have some other files from the same
184 if ((avc->states & CRO) == 0 && avc->callback) {
187 ObtainWriteLock(&afs_xcbhash, 460);
188 afs_DequeueCallback(avc); /* remove it from queued callbacks list */
189 avc->states &= ~(CStatd | CUnique);
190 ReleaseWriteLock(&afs_xcbhash);
191 afs_symhint_inval(avc);
192 if ((avc->states & CForeign) || (avc->fid.Fid.Vnode & 1))
193 osi_dnlc_purgedp (avc); /* if it (could be) a directory */
195 osi_dnlc_purgevp (avc);
198 * Next, keep track of which vnodes we've deleted for create's
199 * optimistic synchronization algorithm
202 if (avc->fid.Fid.Vnode & 1) afs_oddZaps++;
205 #if !defined(AFS_OSF_ENV)
206 /* put the entry in the free list */
207 avc->nextfree = freeVCList;
209 if (avc->vlruq.prev || avc->vlruq.next) {
210 refpanic ("LRU vs. Free inconsistency");
213 /* This should put it back on the vnode free list since usecount is 1 */
216 if (VREFCOUNT(avc) > 0) {
217 VN_UNLOCK(AFSTOV(avc));
218 AFS_RELE(AFSTOV(avc));
220 if (afs_norefpanic) {
221 printf ("flush vc refcnt < 1");
223 (void) vgone(avc, VX_NOSLEEP, (struct vnodeops *) 0);
225 VN_UNLOCK(AFSTOV(avc));
227 else osi_Panic ("flush vc refcnt < 1");
229 #endif /* AFS_OSF_ENV */
230 avc->states |= CVFlushed;
235 VN_UNLOCK(AFSTOV(avc));
239 } /*afs_FlushVCache*/
245 * The core of the inactive vnode op for all but IRIX.
247 void afs_InactiveVCache(struct vcache *avc, struct AFS_UCRED *acred)
249 extern afs_rwlock_t afs_xdcache, afs_xvcache;
251 AFS_STATCNT(afs_inactive);
252 if (avc->states & CDirty) {
253 /* we can't keep trying to push back dirty data forever. Give up. */
254 afs_InvalidateAllSegments(avc); /* turns off dirty bit */
256 avc->states &= ~CMAPPED; /* mainly used by SunOS 4.0.x */
257 avc->states &= ~CDirty; /* Turn it off */
258 if (avc->states & CUnlinked) {
259 if (CheckLock(&afs_xvcache) || CheckLock(&afs_xdcache)) {
260 avc->states |= CUnlinkedDel;
263 afs_remunlink(avc, 1); /* ignore any return code */
272 * Description: allocate a callback return structure from the
273 * free list and return it.
275 * Env: The alloc and free routines are both called with the afs_xvcb lock
276 * held, so we don't have to worry about blocking in osi_Alloc.
278 static struct afs_cbr *afs_cbrSpace = 0;
279 struct afs_cbr *afs_AllocCBR() {
280 register struct afs_cbr *tsp;
283 while (!afs_cbrSpace) {
284 if (afs_stats_cmperf.CallBackAlloced >= 2) {
285 /* don't allocate more than 2 * AFS_NCBRS for now */
287 afs_stats_cmperf.CallBackFlushes++;
291 tsp = (struct afs_cbr *) afs_osi_Alloc(AFS_NCBRS * sizeof(struct afs_cbr));
292 for(i=0; i < AFS_NCBRS-1; i++) {
293 tsp[i].next = &tsp[i+1];
295 tsp[AFS_NCBRS-1].next = 0;
297 afs_stats_cmperf.CallBackAlloced++;
301 afs_cbrSpace = tsp->next;
308 * Description: free a callback return structure.
311 * asp -- the address of the structure to free.
313 * Environment: the xvcb lock is held over these calls.
316 register struct afs_cbr *asp; {
317 asp->next = afs_cbrSpace;
325 * Description: flush all queued callbacks to all servers.
329 * Environment: holds xvcb lock over RPC to guard against race conditions
330 * when a new callback is granted for the same file later on.
332 afs_int32 afs_FlushVCBs (afs_int32 lockit)
334 struct AFSFid tfids[AFS_MAXCBRSCALL];
335 struct AFSCallBack callBacks[1];
336 struct AFSCBFids fidArray;
337 struct AFSCBs cbArray;
339 struct afs_cbr *tcbrp;
343 struct vrequest treq;
345 int safety1, safety2, safety3;
346 extern int afs_totalServers;
349 if (code = afs_InitReq(&treq, &afs_osi_cred)) return code;
350 treq.flags |= O_NONBLOCK;
352 if (lockit) MObtainWriteLock(&afs_xvcb,273);
353 ObtainReadLock(&afs_xserver);
354 for(i=0; i<NSERVERS; i++) {
355 for(safety1 = 0, tsp = afs_servers[i];
356 tsp && safety1 < afs_totalServers+10; tsp=tsp->next, safety1++) {
358 if (tsp->cbrs == (struct afs_cbr *) 0) continue;
360 /* otherwise, grab a block of AFS_MAXCBRSCALL from the list
361 * and make an RPC, over and over again.
363 tcount = 0; /* number found so far */
364 for (safety2 = 0; safety2 < afs_cacheStats ; safety2++) {
365 if (tcount >= AFS_MAXCBRSCALL || !tsp->cbrs) {
366 /* if buffer is full, or we've queued all we're going
367 * to from this server, we should flush out the
370 fidArray.AFSCBFids_len = tcount;
371 fidArray.AFSCBFids_val = (struct AFSFid *) tfids;
372 cbArray.AFSCBs_len = 1;
373 cbArray.AFSCBs_val = callBacks;
374 callBacks[0].CallBackType = CB_EXCLUSIVE;
375 for (safety3 = 0; safety3 < MAXHOSTS*2; safety3++) {
376 tc = afs_ConnByHost(tsp, tsp->cell->fsport,
377 tsp->cell->cell, &treq, 0,
380 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS);
382 code = RXAFS_GiveUpCallBacks(tc->id, &fidArray,
388 if (!afs_Analyze(tc, code, 0, &treq,
389 AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS,
390 SHARED_LOCK, tsp->cell)) {
394 /* ignore return code, since callbacks may have
395 * been returned anyway, we shouldn't leave them
396 * around to be returned again.
398 * Next, see if we are done with this server, and if so,
399 * break to deal with the next one.
401 if (!tsp->cbrs) break;
403 } /* if to flush full buffer */
404 /* if we make it here, we have an entry at the head of cbrs,
405 * which we should copy to the file ID array and then free.
408 tfids[tcount++] = tcbrp->fid;
409 tsp->cbrs = tcbrp->next;
411 } /* while loop for this one server */
412 if (safety2 > afs_cacheStats) {
413 afs_warn("possible internal error afs_flushVCBs (%d)\n", safety2);
415 } /* for loop for this hash chain */
416 } /* loop through all hash chains */
417 if (safety1 > afs_totalServers+2) {
418 afs_warn("AFS internal error (afs_flushVCBs) (%d > %d), continuing...\n", safety1, afs_totalServers+2);
420 osi_Panic("afs_flushVCBS safety1");
423 ReleaseReadLock(&afs_xserver);
424 if (lockit) MReleaseWriteLock(&afs_xvcb);
432 * Queue a callback on the given fid.
438 * Locks the xvcb lock.
439 * Called when the xvcache lock is already held.
442 static afs_int32 afs_QueueVCB(struct vcache *avc)
444 register struct server *tsp;
445 register struct afs_cbr *tcbp;
447 AFS_STATCNT(afs_QueueVCB);
448 /* The callback is really just a struct server ptr. */
449 tsp = (struct server *)(avc->callback);
451 /* we now have a pointer to the server, so we just allocate
452 * a queue entry and queue it.
454 MObtainWriteLock(&afs_xvcb,274);
455 tcbp = afs_AllocCBR();
456 tcbp->fid = avc->fid.Fid;
457 tcbp->next = tsp->cbrs;
460 /* now release locks and return */
461 MReleaseWriteLock(&afs_xvcb);
465 #ifdef AFS_LINUX22_ENV
466 /* afs_TryFlushDcacheChildren -- Shakes loose vcache references held by
467 * children of the dentry
469 * LOCKS -- Called with afs_xvcache write locked. Drops and reaquires
470 * AFS_GLOCK, so it can call dput, which may call iput, but
471 * keeps afs_xvcache exclusively.
473 * Tree traversal algorithm from fs/dcache.c: select_parent()
475 static void afs_TryFlushDcacheChildren(struct vcache *tvc)
477 struct inode *ip = AFSTOI(tvc);
478 struct dentry *this_parent;
479 struct list_head *next;
480 struct list_head *cur;
481 struct list_head *head = &ip->i_dentry;
482 struct dentry *dentry;
494 while ((cur = cur->next) != head) {
495 dentry = list_entry(cur, struct dentry, d_alias);
496 if (DCOUNT(dentry)) {
497 this_parent = dentry;
499 next = this_parent->d_subdirs.next;
501 while (next && next != &this_parent->d_subdirs) {
502 struct list_head *tmp = next;
503 struct dentry *dchld = list_entry(tmp, struct dentry, d_child);
506 if (!DCOUNT(dchld) && !dchld->d_inode) {
517 * Descend a level if the d_subdirs list is non-empty.
519 if (!list_empty(&dchld->d_subdirs)) {
526 * All done at this level ... ascend and resume the search.
528 if (this_parent != dentry) {
529 next = this_parent->d_child.next;
530 this_parent = this_parent->d_parent;
535 if (!DCOUNT(dentry)) {
548 #endif /* AFS_LINUX22_ENV */
554 * Remove a queued callback by looking through all the servers
555 * to see if any have this callback queued.
558 * afid: The fid we want cleansed of queued callbacks.
561 * Locks xvcb and xserver locks.
562 * Typically called with xdcache, xvcache and/or individual vcache
567 register struct VenusFid *afid;
572 register struct server *tsp;
573 register struct afs_cbr *tcbrp;
574 struct afs_cbr **lcbrpp;
576 AFS_STATCNT(afs_RemoveVCB);
577 MObtainWriteLock(&afs_xvcb,275);
578 ObtainReadLock(&afs_xserver);
579 for(i=0;i<NSERVERS;i++) {
580 for(tsp=afs_servers[i]; tsp; tsp=tsp->next) {
581 /* if cell is known, and is wrong, then skip this server */
582 if (tsp->cell && tsp->cell->cell != afid->Cell) continue;
585 * Otherwise, iterate through file IDs we're sending to the
588 lcbrpp = &tsp->cbrs; /* first queued return callback */
589 for(tcbrp = *lcbrpp; tcbrp; lcbrpp = &tcbrp->next, tcbrp = *lcbrpp) {
590 if (afid->Fid.Volume == tcbrp->fid.Volume &&
591 afid->Fid.Unique == tcbrp->fid.Unique &&
592 afid->Fid.Vnode == tcbrp->fid.Vnode) {
593 *lcbrpp = tcbrp->next; /* unthread from list */
601 ReleaseReadLock(&afs_xserver);
602 MReleaseWriteLock(&afs_xvcb);
612 * This routine is responsible for allocating a new cache entry
613 * from the free list. It formats the cache entry and inserts it
614 * into the appropriate hash tables. It must be called with
615 * afs_xvcache write-locked so as to prevent several processes from
616 * trying to create a new cache entry simultaneously.
619 * afid : The file id of the file whose cache entry is being
622 /* LOCK: afs_NewVCache afs_xvcache W */
623 struct vcache *afs_NewVCache(struct VenusFid *afid, struct server *serverp,
624 afs_int32 lockit, afs_int32 locktype)
628 afs_int32 anumber = VCACHE_FREE;
630 struct gnode *gnodepnt;
633 struct vm_info * vm_info_ptr;
634 #endif /* AFS_MACH_ENV */
637 #endif /* AFS_OSF_ENV */
638 struct afs_q *tq, *uq;
641 AFS_STATCNT(afs_NewVCache);
644 if (afs_vcount >= afs_maxvcount)
647 * If we are using > 33 % of the total system vnodes for AFS vcache
648 * entries or we are using the maximum number of vcache entries,
649 * then free some. (if our usage is > 33% we should free some, if
650 * our usage is > afs_maxvcount, set elsewhere to 0.5*nvnode,
651 * we _must_ free some -- no choice).
653 if ( (( 3 * afs_vcount ) > nvnode) || ( afs_vcount >= afs_maxvcount ))
656 struct afs_q *tq, *uq;
657 int i; char *panicstr;
660 for(tq = VLRU.prev; tq != &VLRU && anumber > 0; tq = uq) {
663 if (tvc->states & CVFlushed)
664 refpanic ("CVFlushed on VLRU");
665 else if (i++ > afs_maxvcount)
666 refpanic ("Exceeded pool of AFS vnodes(VLRU cycle?)");
667 else if (QNext(uq) != tq)
668 refpanic ("VLRU inconsistent");
669 else if (VREFCOUNT(tvc) < 1)
670 refpanic ("refcnt 0 on VLRU");
672 if ( VREFCOUNT(tvc) == 1 && tvc->opens == 0
673 && (tvc->states & CUnlinkedDel) == 0) {
674 code = afs_FlushVCache(tvc, &fv_slept);
681 continue; /* start over - may have raced. */
686 if (anumber == VCACHE_FREE) {
687 printf("NewVCache: warning none freed, using %d of %d\n",
688 afs_vcount, afs_maxvcount);
689 if (afs_vcount >= afs_maxvcount) {
690 osi_Panic("NewVCache - none freed");
691 /* XXX instead of panicing, should do afs_maxvcount++
692 and magic up another one */
698 if (getnewvnode(MOUNT_AFS, &Afs_vnodeops, &nvc)) {
699 /* What should we do ???? */
700 osi_Panic("afs_NewVCache: no more vnodes");
705 tvc->nextfree = (struct vcache *)0;
707 #else /* AFS_OSF_ENV */
708 /* pull out a free cache entry */
711 for(tq = VLRU.prev; (anumber > 0) && (tq != &VLRU); tq = uq) {
715 if (tvc->states & CVFlushed)
716 refpanic("CVFlushed on VLRU");
717 else if (i++ > 2*afs_cacheStats) /* even allowing for a few xallocs...*/
718 refpanic("Increase -stat parameter of afsd(VLRU cycle?)");
719 else if (QNext(uq) != tq)
720 refpanic("VLRU inconsistent");
722 #ifdef AFS_DARWIN_ENV
723 if (tvc->opens == 0 && ((tvc->states & CUnlinkedDel) == 0) &&
724 VREFCOUNT(tvc) == 1 && UBCINFOEXISTS(&tvc->v)) {
725 osi_VM_TryReclaim(tvc, &fv_slept);
729 continue; /* start over - may have raced. */
733 #if defined(AFS_FBSD_ENV)
734 if (VREFCOUNT(tvc) == 1 && tvc->opens == 0
735 && (tvc->states & CUnlinkedDel) == 0) {
736 if (!(VOP_LOCK(&tvc->v, LK_EXCLUSIVE, curproc))) {
737 if (VREFCOUNT(tvc) == 1 && tvc->opens == 0
738 && (tvc->states & CUnlinkedDel) == 0) {
740 AFS_GUNLOCK(); /* perhaps inline inactive for locking */
741 VOP_INACTIVE(&tvc->v, curproc);
744 VOP_UNLOCK(&tvc->v, 0, curproc);
749 #if defined(AFS_LINUX22_ENV)
750 if (tvc != afs_globalVp && VREFCOUNT(tvc) && tvc->opens == 0)
751 afs_TryFlushDcacheChildren(tvc);
754 if (VREFCOUNT(tvc) == 0 && tvc->opens == 0
755 && (tvc->states & CUnlinkedDel) == 0) {
756 code = afs_FlushVCache(tvc, &fv_slept);
763 continue; /* start over - may have raced. */
766 if (tq == uq ) break;
770 /* none free, making one is better than a panic */
771 afs_stats_cmperf.vcacheXAllocs++; /* count in case we have a leak */
772 tvc = (struct vcache *) afs_osi_Alloc(sizeof (struct vcache));
774 pin((char *)tvc, sizeof(struct vcache)); /* XXX */
777 /* In case it still comes here we need to fill this */
778 tvc->v.v_vm_info = VM_INFO_NULL;
779 vm_info_init(tvc->v.v_vm_info);
780 /* perhaps we should also do close_flush on non-NeXT mach systems;
781 * who knows; we don't currently have the sources.
783 #endif /* AFS_MACH_ENV */
784 #if defined(AFS_SGI_ENV)
785 { char name[METER_NAMSZ];
786 memset(tvc, 0, sizeof(struct vcache));
787 tvc->v.v_number = ++afsvnumbers;
788 tvc->vc_rwlockid = OSI_NO_LOCKID;
789 initnsema(&tvc->vc_rwlock, 1, makesname(name, "vrw", tvc->v.v_number));
790 #ifndef AFS_SGI53_ENV
791 initnsema(&tvc->v.v_sync, 0, makesname(name, "vsy", tvc->v.v_number));
793 #ifndef AFS_SGI62_ENV
794 initnlock(&tvc->v.v_lock, makesname(name, "vlk", tvc->v.v_number));
797 #endif /* AFS_SGI_ENV */
800 tvc = freeVCList; /* take from free list */
801 freeVCList = tvc->nextfree;
802 tvc->nextfree = (struct vcache *)0;
804 #endif /* AFS_OSF_ENV */
807 vm_info_ptr = tvc->v.v_vm_info;
808 #endif /* AFS_MACH_ENV */
810 #if !defined(AFS_SGI_ENV) && !defined(AFS_OSF_ENV)
811 memset((char *)tvc, 0, sizeof(struct vcache));
816 RWLOCK_INIT(&tvc->lock, "vcache lock");
817 #if defined(AFS_SUN5_ENV)
818 RWLOCK_INIT(&tvc->vlock, "vcache vlock");
819 #endif /* defined(AFS_SUN5_ENV) */
822 tvc->v.v_vm_info = vm_info_ptr;
823 tvc->v.v_vm_info->pager = MEMORY_OBJECT_NULL;
824 #endif /* AFS_MACH_ENV */
825 tvc->parentVnode = 0;
826 tvc->mvid = (struct VenusFid *) 0;
827 tvc->linkData = (char *) 0;
830 tvc->execsOrWriters = 0;
834 tvc->last_looker = 0;
836 tvc->asynchrony = -1;
838 afs_symhint_inval(tvc);
840 tvc->flushDV.low = tvc->flushDV.high = AFS_MAXDV;
843 tvc->truncPos = AFS_NOTRUNC; /* don't truncate until we need to */
844 hzero(tvc->m.DataVersion); /* in case we copy it into flushDV */
846 /* Hold it for the LRU (should make count 2) */
847 VN_HOLD(AFSTOV(tvc));
848 #else /* AFS_OSF_ENV */
849 VREFCOUNT_SET(tvc, 1); /* us */
850 #endif /* AFS_OSF_ENV */
852 LOCK_INIT(&tvc->pvmlock, "vcache pvmlock");
853 tvc->vmh = tvc->segid = NULL;
856 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
857 #if defined(AFS_SUN5_ENV)
858 rw_init(&tvc->rwlock, "vcache rwlock", RW_DEFAULT, NULL);
860 #if defined(AFS_SUN55_ENV)
861 /* This is required if the kaio (kernel aynchronous io)
862 ** module is installed. Inside the kernel, the function
863 ** check_vp( common/os/aio.c) checks to see if the kernel has
864 ** to provide asynchronous io for this vnode. This
865 ** function extracts the device number by following the
866 ** v_data field of the vnode. If we do not set this field
867 ** then the system panics. The value of the v_data field
868 ** is not really important for AFS vnodes because the kernel
869 ** does not do asynchronous io for regular files. Hence,
870 ** for the time being, we fill up the v_data field with the
871 ** vnode pointer itself. */
872 tvc->v.v_data = (char *)tvc;
873 #endif /* AFS_SUN55_ENV */
875 afs_BozonInit(&tvc->pvnLock, tvc);
879 tvc->callback = serverp; /* to minimize chance that clear
881 /* initialize vnode data, note vrefCount is v.v_count */
883 /* Don't forget to free the gnode space */
884 tvc->v.v_gnode = gnodepnt = (struct gnode *) osi_AllocSmallSpace(sizeof(struct gnode));
885 memset((char *)gnodepnt, 0, sizeof(struct gnode));
888 memset((void*)&(tvc->vc_bhv_desc), 0, sizeof(tvc->vc_bhv_desc));
889 bhv_desc_init(&(tvc->vc_bhv_desc), tvc, tvc, &Afs_vnodeops);
891 vn_bhv_head_init(&(tvc->v.v_bh), "afsvp");
892 vn_bhv_insert_initial(&(tvc->v.v_bh), &(tvc->vc_bhv_desc));
894 bhv_head_init(&(tvc->v.v_bh));
895 bhv_insert_initial(&(tvc->v.v_bh), &(tvc->vc_bhv_desc));
898 tvc->v.v_mreg = tvc->v.v_mregb = (struct pregion*)tvc;
900 tvc->v.v_trace = ktrace_alloc(VNODE_TRACE_SIZE, 0);
902 init_bitlock(&tvc->v.v_pcacheflag, VNODE_PCACHE_LOCKBIT, "afs_pcache",
904 init_mutex(&tvc->v.v_filocksem, MUTEX_DEFAULT, "afsvfl", (long)tvc);
905 init_mutex(&tvc->v.v_buf_lock, MUTEX_DEFAULT, "afsvnbuf", (long)tvc);
907 vnode_pcache_init(&tvc->v);
908 #if defined(DEBUG) && defined(VNODE_INIT_BITLOCK)
909 /* Above define is never true execpt in SGI test kernels. */
910 init_bitlock(&(tvc->v.v_flag, VLOCK, "vnode", tvc->v.v_number);
913 AFS_VN_INIT_BUF_LOCK(&(tvc->v));
916 SetAfsVnode(AFSTOV(tvc));
917 #endif /* AFS_SGI64_ENV */
918 #ifdef AFS_DARWIN_ENV
919 tvc->v.v_ubcinfo = UBC_INFO_NULL;
920 lockinit(&tvc->rwlock, PINOD, "vcache rwlock", 0, 0);
921 cache_purge(AFSTOV(tvc));
924 /* VLISTNONE(&tvc->v); */
925 tvc->v.v_freelist.tqe_next=0;
926 tvc->v.v_freelist.tqe_prev=(struct vnode **)0xdeadb;
927 /*tvc->vrefCount++;*/
930 lockinit(&tvc->rwlock, PINOD, "vcache rwlock", 0, 0);
931 cache_purge(AFSTOV(tvc));
934 tvc->v.v_usecount++; /* steal an extra ref for now so vfree never happens */
935 /* This extra ref is dealt with above... */
938 * The proper value for mvstat (for root fids) is setup by the caller.
941 if (afid->Fid.Vnode == 1 && afid->Fid.Unique == 1)
943 if (afs_globalVFS == 0) osi_Panic("afs globalvfs");
944 vSetVfsp(tvc, afs_globalVFS);
947 tvc->v.v_vfsnext = afs_globalVFS->vfs_vnodes; /* link off vfs */
948 tvc->v.v_vfsprev = NULL;
949 afs_globalVFS->vfs_vnodes = &tvc->v;
950 if (tvc->v.v_vfsnext != NULL)
951 tvc->v.v_vfsnext->v_vfsprev = &tvc->v;
952 tvc->v.v_next = gnodepnt->gn_vnode; /*Single vnode per gnode for us!*/
953 gnodepnt->gn_vnode = &tvc->v;
956 tvc->v.g_dev = ((struct mount *)afs_globalVFS->vfs_data)->m_dev;
958 #if defined(AFS_DUX40_ENV)
959 insmntque(tvc, afs_globalVFS, &afs_ubcops);
962 /* Is this needed??? */
963 insmntque(tvc, afs_globalVFS);
964 #endif /* AFS_OSF_ENV */
965 #endif /* AFS_DUX40_ENV */
966 #if defined(AFS_SGI_ENV)
967 VN_SET_DPAGES(&(tvc->v), (struct pfdat*)NULL);
968 osi_Assert((tvc->v.v_flag & VINACT) == 0);
970 osi_Assert(VN_GET_PGCNT(&(tvc->v)) == 0);
971 osi_Assert(tvc->mapcnt == 0 && tvc->vc_locktrips == 0);
972 osi_Assert(tvc->vc_rwlockid == OSI_NO_LOCKID);
973 osi_Assert(tvc->v.v_filocks == NULL);
974 #if !defined(AFS_SGI65_ENV)
975 osi_Assert(tvc->v.v_filocksem == NULL);
977 osi_Assert(tvc->cred == NULL);
979 vnode_pcache_reinit(&tvc->v);
980 tvc->v.v_rdev = NODEV;
982 vn_initlist((struct vnlist *)&tvc->v);
984 #endif /* AFS_SGI_ENV */
985 #if defined(AFS_LINUX22_ENV)
987 struct inode *ip = AFSTOI(tvc);
988 sema_init(&ip->i_sem, 1);
989 #if defined(AFS_LINUX24_ENV)
990 sema_init(&ip->i_zombie, 1);
991 init_waitqueue_head(&ip->i_wait);
992 spin_lock_init(&ip->i_data.i_shared_lock);
993 #ifdef STRUCT_ADDRESS_SPACE_HAS_PAGE_LOCK
994 spin_lock_init(&ip->i_data.page_lock);
996 INIT_LIST_HEAD(&ip->i_data.clean_pages);
997 INIT_LIST_HEAD(&ip->i_data.dirty_pages);
998 INIT_LIST_HEAD(&ip->i_data.locked_pages);
999 INIT_LIST_HEAD(&ip->i_dirty_buffers);
1000 #ifdef STRUCT_INODE_HAS_I_DIRTY_DATA_BUFFERS
1001 INIT_LIST_HEAD(&ip->i_dirty_data_buffers);
1003 #ifdef STRUCT_INODE_HAS_I_DEVICES
1004 INIT_LIST_HEAD(&ip->i_devices);
1006 ip->i_data.host = (void*) ip;
1007 #ifdef STRUCT_ADDRESS_SPACE_HAS_GFP_MASK
1008 ip->i_data.gfp_mask = GFP_HIGHUSER;
1010 ip->i_mapping = &ip->i_data;
1011 #ifdef STRUCT_INODE_HAS_I_TRUNCATE_SEM
1012 init_rwsem(&ip->i_truncate_sem);
1015 sema_init(&ip->i_atomic_write, 1);
1016 init_waitqueue(&ip->i_wait);
1018 INIT_LIST_HEAD(&ip->i_hash);
1019 INIT_LIST_HEAD(&ip->i_dentry);
1020 if (afs_globalVFS) {
1021 ip->i_dev = afs_globalVFS->s_dev;
1022 ip->i_sb = afs_globalVFS;
1027 osi_dnlc_purgedp(tvc); /* this may be overkill */
1028 memset((char *)&(tvc->quick), 0, sizeof(struct vtodc));
1029 memset((char *)&(tvc->callsort), 0, sizeof(struct afs_q));
1030 tvc->slocks = (struct SimpleLocks *)0;
1033 tvc->hnext = afs_vhashT[i];
1034 afs_vhashT[i] = tvc;
1035 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
1036 refpanic ("NewVCache VLRU inconsistent");
1038 QAdd(&VLRU, &tvc->vlruq); /* put in lruq */
1039 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
1040 refpanic ("NewVCache VLRU inconsistent2");
1042 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
1043 refpanic ("NewVCache VLRU inconsistent3");
1045 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
1046 refpanic ("NewVCache VLRU inconsistent4");
1056 * afs_FlushActiveVcaches
1062 * doflocks : Do we handle flocks?
1064 /* LOCK: afs_FlushActiveVcaches afs_xvcache N */
1066 afs_FlushActiveVcaches(doflocks)
1067 register afs_int32 doflocks;
1069 { /*afs_FlushActiveVcaches*/
1071 register struct vcache *tvc;
1073 register struct conn *tc;
1074 register afs_int32 code;
1075 register struct AFS_UCRED *cred;
1076 struct vrequest treq, ureq;
1077 struct AFSVolSync tsync;
1081 AFS_STATCNT(afs_FlushActiveVcaches);
1082 ObtainReadLock(&afs_xvcache);
1083 for(i=0;i<VCSIZE;i++) {
1084 for(tvc = afs_vhashT[i]; tvc; tvc=tvc->hnext) {
1085 if (doflocks && tvc->flockCount != 0) {
1086 /* if this entry has an flock, send a keep-alive call out */
1088 ReleaseReadLock(&afs_xvcache);
1089 ObtainWriteLock(&tvc->lock,51);
1091 afs_InitReq(&treq, &afs_osi_cred);
1092 treq.flags |= O_NONBLOCK;
1094 tc = afs_Conn(&tvc->fid, &treq, SHARED_LOCK);
1096 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_EXTENDLOCK);
1099 RXAFS_ExtendLock(tc->id,
1100 (struct AFSFid *) &tvc->fid.Fid,
1107 (afs_Analyze(tc, code, &tvc->fid, &treq,
1108 AFS_STATS_FS_RPCIDX_EXTENDLOCK,
1109 SHARED_LOCK, (struct cell *)0));
1111 ReleaseWriteLock(&tvc->lock);
1112 ObtainReadLock(&afs_xvcache);
1116 if ((tvc->states & CCore) || (tvc->states & CUnlinkedDel)) {
1118 * Don't let it evaporate in case someone else is in
1119 * this code. Also, drop the afs_xvcache lock while
1120 * getting vcache locks.
1123 ReleaseReadLock(&afs_xvcache);
1124 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV)
1125 afs_BozonLock(&tvc->pvnLock, tvc);
1127 #if defined(AFS_SGI_ENV)
1129 * That's because if we come in via the CUnlinkedDel bit state path we'll be have 0 refcnt
1131 osi_Assert(VREFCOUNT(tvc) > 0);
1132 AFS_RWLOCK((vnode_t *)tvc, VRWLOCK_WRITE);
1134 ObtainWriteLock(&tvc->lock,52);
1135 if (tvc->states & CCore) {
1136 tvc->states &= ~CCore;
1137 /* XXXX Find better place-holder for cred XXXX */
1138 cred = (struct AFS_UCRED *) tvc->linkData;
1139 tvc->linkData = (char *) 0; /* XXX */
1140 afs_InitReq(&ureq, cred);
1141 afs_Trace2(afs_iclSetp, CM_TRACE_ACTCCORE,
1142 ICL_TYPE_POINTER, tvc,
1143 ICL_TYPE_INT32, tvc->execsOrWriters);
1144 code = afs_StoreOnLastReference(tvc, &ureq);
1145 ReleaseWriteLock(&tvc->lock);
1146 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV)
1147 afs_BozonUnlock(&tvc->pvnLock, tvc);
1149 hzero(tvc->flushDV);
1152 if (code && code != VNOVNODE) {
1153 afs_StoreWarn(code, tvc->fid.Fid.Volume,
1154 /* /dev/console */ 1);
1156 } else if (tvc->states & CUnlinkedDel) {
1160 ReleaseWriteLock(&tvc->lock);
1161 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV)
1162 afs_BozonUnlock(&tvc->pvnLock, tvc);
1164 #if defined(AFS_SGI_ENV)
1165 AFS_RWUNLOCK((vnode_t *)tvc, VRWLOCK_WRITE);
1167 afs_remunlink(tvc, 0);
1168 #if defined(AFS_SGI_ENV)
1169 AFS_RWLOCK((vnode_t *)tvc, VRWLOCK_WRITE);
1173 /* lost (or won, perhaps) the race condition */
1174 ReleaseWriteLock(&tvc->lock);
1175 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV)
1176 afs_BozonUnlock(&tvc->pvnLock, tvc);
1179 #if defined(AFS_SGI_ENV)
1180 AFS_RWUNLOCK((vnode_t *)tvc, VRWLOCK_WRITE);
1182 ObtainReadLock(&afs_xvcache);
1188 AFS_RELE(AFSTOV(tvc));
1190 /* Matches write code setting CCore flag */
1194 #ifdef AFS_DARWIN_ENV
1195 if (VREFCOUNT(tvc) == 1 && UBCINFOEXISTS(&tvc->v)) {
1196 if (tvc->opens) panic("flushactive open, hasubc, but refcnt 1");
1197 osi_VM_TryReclaim(tvc,0);
1202 ReleaseReadLock(&afs_xvcache);
1204 } /*afs_FlushActiveVcaches*/
1211 * Make sure a cache entry is up-to-date status-wise.
1213 * NOTE: everywhere that calls this can potentially be sped up
1214 * by checking CStatd first, and avoiding doing the InitReq
1215 * if this is up-to-date.
1217 * Anymore, the only places that call this KNOW already that the
1218 * vcache is not up-to-date, so we don't screw around.
1221 * avc : Ptr to vcache entry to verify.
1225 int afs_VerifyVCache2(struct vcache *avc, struct vrequest *areq)
1227 register struct vcache *tvc;
1229 AFS_STATCNT(afs_VerifyVCache);
1231 #if defined(AFS_OSF_ENV)
1232 ObtainReadLock(&avc->lock);
1233 if (afs_IsWired(avc)) {
1234 ReleaseReadLock(&avc->lock);
1237 ReleaseReadLock(&avc->lock);
1238 #endif /* AFS_OSF_ENV */
1239 /* otherwise we must fetch the status info */
1241 ObtainWriteLock(&avc->lock,53);
1242 if (avc->states & CStatd) {
1243 ReleaseWriteLock(&avc->lock);
1246 ObtainWriteLock(&afs_xcbhash, 461);
1247 avc->states &= ~( CStatd | CUnique );
1248 avc->callback = (struct server *)0;
1249 afs_DequeueCallback(avc);
1250 ReleaseWriteLock(&afs_xcbhash);
1251 ReleaseWriteLock(&avc->lock);
1253 /* since we've been called back, or the callback has expired,
1254 * it's possible that the contents of this directory, or this
1255 * file's name have changed, thus invalidating the dnlc contents.
1257 if ((avc->states & CForeign) || (avc->fid.Fid.Vnode & 1))
1258 osi_dnlc_purgedp (avc);
1260 osi_dnlc_purgevp (avc);
1262 /* fetch the status info */
1263 tvc = afs_GetVCache(&avc->fid, areq, (afs_int32*)0, avc, READ_LOCK);
1264 if (!tvc) return ENOENT;
1265 /* Put it back; caller has already incremented vrefCount */
1266 afs_PutVCache(tvc, READ_LOCK);
1269 } /*afs_VerifyVCache*/
1276 * Simple copy of stat info into cache.
1279 * avc : Ptr to vcache entry involved.
1280 * astat : Ptr to stat info to copy.
1283 * Nothing interesting.
1285 * Callers: as of 1992-04-29, only called by WriteVCache
1288 afs_SimpleVStat(avc, astat, areq)
1289 register struct vcache *avc;
1290 register struct AFSFetchStatus *astat;
1291 struct vrequest *areq;
1292 { /*afs_SimpleVStat*/
1295 AFS_STATCNT(afs_SimpleVStat);
1298 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)
1299 && !AFS_VN_MAPPED((vnode_t*)avc))
1301 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc))
1305 #ifdef AFS_64BIT_ClIENT
1306 FillInt64(length, astat->Length_hi, astat->Length);
1307 #else /* AFS_64BIT_CLIENT */
1308 length = astat->Length;
1309 #endif /* AFS_64BIT_CLIENT */
1310 #if defined(AFS_SGI_ENV)
1311 osi_Assert((valusema(&avc->vc_rwlock) <= 0) &&
1312 (OSI_GET_LOCKID() == avc->vc_rwlockid));
1313 if (length < avc->m.Length) {
1314 vnode_t *vp = (vnode_t *)avc;
1316 osi_Assert(WriteLocked(&avc->lock));
1317 ReleaseWriteLock(&avc->lock);
1319 PTOSSVP(vp, (off_t)length, (off_t)MAXLONG);
1321 ObtainWriteLock(&avc->lock,67);
1324 /* if writing the file, don't fetch over this value */
1325 afs_Trace3(afs_iclSetp, CM_TRACE_SIMPLEVSTAT,
1326 ICL_TYPE_POINTER, avc,
1327 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length),
1328 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length));
1329 avc->m.Length = length;
1330 avc->m.Date = astat->ClientModTime;
1332 avc->m.Owner = astat->Owner;
1333 avc->m.Group = astat->Group;
1334 avc->m.Mode = astat->UnixModeBits;
1335 if (vType(avc) == VREG) {
1336 avc->m.Mode |= S_IFREG;
1338 else if (vType(avc) == VDIR) {
1339 avc->m.Mode |= S_IFDIR;
1341 else if (vType(avc) == VLNK) {
1345 avc->m.Mode |= S_IFLNK;
1346 if ((avc->m.Mode & 0111) == 0) avc->mvstat = 1;
1348 if (avc->states & CForeign) {
1349 struct axscache *ac;
1350 avc->anyAccess = astat->AnonymousAccess;
1352 if ((astat->CallerAccess & ~astat->AnonymousAccess))
1354 * Caller has at least one bit not covered by anonymous, and
1355 * thus may have interesting rights.
1357 * HOWEVER, this is a really bad idea, because any access query
1358 * for bits which aren't covered by anonymous, on behalf of a user
1359 * who doesn't have any special rights, will result in an answer of
1360 * the form "I don't know, lets make a FetchStatus RPC and find out!"
1361 * It's an especially bad idea under Ultrix, since (due to the lack of
1362 * a proper access() call) it must perform several afs_access() calls
1363 * in order to create magic mode bits that vary according to who makes
1364 * the call. In other words, _every_ stat() generates a test for
1367 #endif /* badidea */
1368 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
1369 ac->axess = astat->CallerAccess;
1370 else /* not found, add a new one if possible */
1371 afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess);
1375 } /*afs_SimpleVStat*/
1382 * Store the status info *only* back to the server for a
1386 * avc : Ptr to the vcache entry.
1387 * astatus : Ptr to the status info to store.
1388 * areq : Ptr to the associated vrequest.
1391 * Must be called with a shared lock held on the vnode.
1394 afs_WriteVCache(avc, astatus, areq)
1395 register struct vcache *avc;
1396 register struct AFSStoreStatus *astatus;
1397 struct vrequest *areq;
1399 { /*afs_WriteVCache*/
1402 struct AFSFetchStatus OutStatus;
1403 struct AFSVolSync tsync;
1406 AFS_STATCNT(afs_WriteVCache);
1407 afs_Trace2(afs_iclSetp, CM_TRACE_WVCACHE, ICL_TYPE_POINTER, avc,
1408 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
1411 tc = afs_Conn(&avc->fid, areq, SHARED_LOCK);
1413 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_STORESTATUS);
1415 code = RXAFS_StoreStatus(tc->id,
1416 (struct AFSFid *) &avc->fid.Fid,
1417 astatus, &OutStatus, &tsync);
1423 (afs_Analyze(tc, code, &avc->fid, areq,
1424 AFS_STATS_FS_RPCIDX_STORESTATUS,
1425 SHARED_LOCK, (struct cell *)0));
1427 UpgradeSToWLock(&avc->lock,20);
1429 /* success, do the changes locally */
1430 afs_SimpleVStat(avc, &OutStatus, areq);
1432 * Update the date, too. SimpleVStat didn't do this, since
1433 * it thought we were doing this after fetching new status
1434 * over a file being written.
1436 avc->m.Date = OutStatus.ClientModTime;
1439 /* failure, set up to check with server next time */
1440 ObtainWriteLock(&afs_xcbhash, 462);
1441 afs_DequeueCallback(avc);
1442 avc->states &= ~( CStatd | CUnique); /* turn off stat valid flag */
1443 ReleaseWriteLock(&afs_xcbhash);
1444 if ((avc->states & CForeign) || (avc->fid.Fid.Vnode & 1))
1445 osi_dnlc_purgedp (avc); /* if it (could be) a directory */
1447 ConvertWToSLock(&avc->lock);
1450 } /*afs_WriteVCache*/
1456 * Copy astat block into vcache info
1459 * avc : Ptr to vcache entry.
1460 * astat : Ptr to stat block to copy in.
1461 * areq : Ptr to associated request.
1464 * Must be called under a write lock
1466 * Note: this code may get dataversion and length out of sync if the file has
1467 * been modified. This is less than ideal. I haven't thought about
1468 * it sufficiently to be certain that it is adequate.
1471 afs_ProcessFS(avc, astat, areq)
1472 register struct vcache *avc;
1473 struct vrequest *areq;
1474 register struct AFSFetchStatus *astat;
1480 AFS_STATCNT(afs_ProcessFS);
1482 #ifdef AFS_64BIT_CLIENT
1483 FillInt64(length, astat->Length_hi, astat->Length);
1484 #else /* AFS_64BIT_CLIENT */
1485 length = astat->Length;
1486 #endif /* AFS_64BIT_CLIENT */
1487 /* WARNING: afs_DoBulkStat uses the Length field to store a sequence
1488 * number for each bulk status request. Under no circumstances
1489 * should afs_DoBulkStat store a sequence number if the new
1490 * length will be ignored when afs_ProcessFS is called with
1491 * new stats. If you change the following conditional then you
1492 * also need to change the conditional in afs_DoBulkStat. */
1494 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)
1495 && !AFS_VN_MAPPED((vnode_t*)avc))
1497 if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc))
1500 /* if we're writing or mapping this file, don't fetch over these
1503 afs_Trace3(afs_iclSetp, CM_TRACE_PROCESSFS, ICL_TYPE_POINTER, avc,
1504 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length),
1505 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length));
1506 avc->m.Length = length;
1507 avc->m.Date = astat->ClientModTime;
1509 hset64(avc->m.DataVersion, astat->dataVersionHigh, astat->DataVersion);
1510 avc->m.Owner = astat->Owner;
1511 avc->m.Mode = astat->UnixModeBits;
1512 avc->m.Group = astat->Group;
1513 avc->m.LinkCount = astat->LinkCount;
1514 if (astat->FileType == File) {
1515 vSetType(avc, VREG);
1516 avc->m.Mode |= S_IFREG;
1518 else if (astat->FileType == Directory) {
1519 vSetType(avc, VDIR);
1520 avc->m.Mode |= S_IFDIR;
1522 else if (astat->FileType == SymbolicLink) {
1523 if (afs_fakestat_enable && (avc->m.Mode & 0111) == 0) {
1524 vSetType(avc, VDIR);
1525 avc->m.Mode |= S_IFDIR;
1527 vSetType(avc, VLNK);
1528 avc->m.Mode |= S_IFLNK;
1530 if ((avc->m.Mode & 0111) == 0) {
1534 avc->anyAccess = astat->AnonymousAccess;
1536 if ((astat->CallerAccess & ~astat->AnonymousAccess))
1538 * Caller has at least one bit not covered by anonymous, and
1539 * thus may have interesting rights.
1541 * HOWEVER, this is a really bad idea, because any access query
1542 * for bits which aren't covered by anonymous, on behalf of a user
1543 * who doesn't have any special rights, will result in an answer of
1544 * the form "I don't know, lets make a FetchStatus RPC and find out!"
1545 * It's an especially bad idea under Ultrix, since (due to the lack of
1546 * a proper access() call) it must perform several afs_access() calls
1547 * in order to create magic mode bits that vary according to who makes
1548 * the call. In other words, _every_ stat() generates a test for
1551 #endif /* badidea */
1553 struct axscache *ac;
1554 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
1555 ac->axess = astat->CallerAccess;
1556 else /* not found, add a new one if possible */
1557 afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess);
1560 #ifdef AFS_LINUX22_ENV
1561 vcache2inode(avc); /* Set the inode attr cache */
1567 afs_RemoteLookup(afid, areq, name, nfid, OutStatusp, CallBackp, serverp, tsyncp)
1568 register struct VenusFid *afid;
1569 struct vrequest *areq;
1571 struct VenusFid *nfid;
1572 struct AFSFetchStatus *OutStatusp;
1573 struct AFSCallBack *CallBackp;
1574 struct server **serverp;
1575 struct AFSVolSync *tsyncp;
1578 register struct vcache *tvc;
1581 register struct conn *tc;
1582 struct AFSFetchStatus OutDirStatus;
1585 if (!name) name = ""; /* XXX */
1587 tc = afs_Conn(afid, areq, SHARED_LOCK);
1589 if (serverp) *serverp = tc->srvr->server;
1591 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_XLOOKUP);
1593 code = RXAFS_Lookup(tc->id, (struct AFSFid *) &afid->Fid, name,
1594 (struct AFSFid *) &nfid->Fid,
1595 OutStatusp, &OutDirStatus, CallBackp, tsyncp);
1601 (afs_Analyze(tc, code, afid, areq,
1602 AFS_STATS_FS_RPCIDX_XLOOKUP,
1603 SHARED_LOCK, (struct cell *)0));
1613 * Given a file id and a vrequest structure, fetch the status
1614 * information associated with the file.
1618 * areq : Ptr to associated vrequest structure, specifying the
1619 * user whose authentication tokens will be used.
1620 * avc : caller may already have a vcache for this file, which is
1624 * The cache entry is returned with an increased vrefCount field.
1625 * The entry must be discarded by calling afs_PutVCache when you
1626 * are through using the pointer to the cache entry.
1628 * You should not hold any locks when calling this function, except
1629 * locks on other vcache entries. If you lock more than one vcache
1630 * entry simultaneously, you should lock them in this order:
1632 * 1. Lock all files first, then directories.
1633 * 2. Within a particular type, lock entries in Fid.Vnode order.
1635 * This locking hierarchy is convenient because it allows locking
1636 * of a parent dir cache entry, given a file (to check its access
1637 * control list). It also allows renames to be handled easily by
1638 * locking directories in a constant order.
1639 * NB. NewVCache -> FlushVCache presently (4/10/95) drops the xvcache lock.
1641 struct vcache *afs_GetVCache(afid, areq, cached, avc, locktype)
1642 register struct VenusFid *afid;
1643 struct vrequest *areq;
1646 struct vcache *avc; /* might have a vcache structure already, which must
1647 * already be held by the caller */
1650 afs_int32 code, i, newvcache=0;
1651 register struct vcache *tvc;
1655 AFS_STATCNT(afs_GetVCache);
1657 if (cached) *cached = 0; /* Init just in case */
1660 ObtainSharedLock(&afs_xvcache,5);
1662 tvc = afs_FindVCache(afid, 0, 0, &retry, DO_STATS | DO_VLRU );
1664 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1665 ReleaseSharedLock(&afs_xvcache);
1666 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1674 if (tvc->states & CStatd) {
1675 ReleaseSharedLock(&afs_xvcache);
1680 UpgradeSToWLock(&afs_xvcache,21);
1682 /* no cache entry, better grab one */
1683 tvc = afs_NewVCache(afid, (struct server *)0, 1, WRITE_LOCK);
1686 ConvertWToSLock(&afs_xvcache);
1687 afs_stats_cmperf.vcacheMisses++;
1690 ReleaseSharedLock(&afs_xvcache);
1692 ObtainWriteLock(&tvc->lock,54);
1694 if (tvc->states & CStatd) {
1695 #ifdef AFS_LINUX22_ENV
1698 ReleaseWriteLock(&tvc->lock);
1699 #ifdef AFS_DARWIN_ENV
1705 #if defined(AFS_OSF_ENV)
1706 if (afs_IsWired(tvc)) {
1707 ReleaseWriteLock(&tvc->lock);
1710 #endif /* AFS_OSF_ENV */
1712 ObtainWriteLock(&afs_xcbhash, 464);
1713 tvc->states &= ~CUnique;
1715 afs_DequeueCallback(tvc);
1716 ReleaseWriteLock(&afs_xcbhash);
1718 /* It is always appropriate to throw away all the access rights? */
1719 afs_FreeAllAxs(&(tvc->Access));
1720 tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-volume info */
1722 if ((tvp->states & VForeign)) {
1723 if (newvcache) tvc->states |= CForeign;
1724 if (newvcache && (tvp->rootVnode == afid->Fid.Vnode)
1725 && (tvp->rootUnique == afid->Fid.Unique)) {
1729 if (tvp->states & VRO) tvc->states |= CRO;
1730 if (tvp->states & VBackup) tvc->states |= CBackup;
1731 /* now copy ".." entry back out of volume structure, if necessary */
1732 if (tvc->mvstat == 2 && tvp->dotdot.Fid.Volume != 0) {
1734 tvc->mvid = (struct VenusFid *)
1735 osi_AllocSmallSpace(sizeof(struct VenusFid));
1736 *tvc->mvid = tvp->dotdot;
1738 afs_PutVolume(tvp, READ_LOCK);
1742 afs_RemoveVCB(afid);
1744 struct AFSFetchStatus OutStatus;
1746 if (afs_DynrootNewVnode(tvc, &OutStatus)) {
1747 afs_ProcessFS(tvc, &OutStatus, areq);
1748 tvc->states |= CStatd | CUnique;
1751 code = afs_FetchStatus(tvc, afid, areq, &OutStatus);
1756 ReleaseWriteLock(&tvc->lock);
1758 ObtainReadLock(&afs_xvcache);
1760 ReleaseReadLock(&afs_xvcache);
1761 return (struct vcache *) 0;
1764 ReleaseWriteLock(&tvc->lock);
1765 #ifdef AFS_DARWIN_ENV
1774 struct vcache *afs_LookupVCache(struct VenusFid *afid, struct vrequest *areq,
1775 afs_int32 *cached, afs_int32 locktype,
1776 struct vcache *adp, char *aname)
1778 afs_int32 code, now, newvcache=0, hash;
1779 struct VenusFid nfid;
1780 register struct vcache *tvc;
1782 struct AFSFetchStatus OutStatus;
1783 struct AFSCallBack CallBack;
1784 struct AFSVolSync tsync;
1785 struct server *serverp = 0;
1789 AFS_STATCNT(afs_GetVCache);
1790 if (cached) *cached = 0; /* Init just in case */
1793 ObtainReadLock(&afs_xvcache);
1794 tvc = afs_FindVCache(afid, 0, 0, &retry, DO_STATS /* no vlru */);
1797 ReleaseReadLock(&afs_xvcache);
1799 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1800 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1804 ObtainReadLock(&tvc->lock);
1806 if (tvc->states & CStatd) {
1810 ReleaseReadLock(&tvc->lock);
1813 tvc->states &= ~CUnique;
1815 ReleaseReadLock(&tvc->lock);
1816 ObtainReadLock(&afs_xvcache);
1820 ReleaseReadLock(&afs_xvcache);
1822 /* lookup the file */
1825 origCBs = afs_allCBs; /* if anything changes, we don't have a cb */
1826 code = afs_RemoteLookup(&adp->fid, areq, aname, &nfid, &OutStatus, &CallBack,
1830 ObtainSharedLock(&afs_xvcache,6);
1831 tvc = afs_FindVCache(&nfid, 0, 0, &retry, DO_VLRU /* no xstats now*/);
1833 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
1834 ReleaseSharedLock(&afs_xvcache);
1835 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
1841 /* no cache entry, better grab one */
1842 UpgradeSToWLock(&afs_xvcache,22);
1843 tvc = afs_NewVCache(&nfid, (struct server *)0, 1, WRITE_LOCK);
1845 ConvertWToSLock(&afs_xvcache);
1848 ReleaseSharedLock(&afs_xvcache);
1849 ObtainWriteLock(&tvc->lock,55);
1851 /* It is always appropriate to throw away all the access rights? */
1852 afs_FreeAllAxs(&(tvc->Access));
1853 tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-vol info */
1855 if ((tvp->states & VForeign)) {
1856 if (newvcache) tvc->states |= CForeign;
1857 if (newvcache && (tvp->rootVnode == afid->Fid.Vnode)
1858 && (tvp->rootUnique == afid->Fid.Unique))
1861 if (tvp->states & VRO) tvc->states |= CRO;
1862 if (tvp->states & VBackup) tvc->states |= CBackup;
1863 /* now copy ".." entry back out of volume structure, if necessary */
1864 if (tvc->mvstat == 2 && tvp->dotdot.Fid.Volume != 0) {
1866 tvc->mvid = (struct VenusFid *)
1867 osi_AllocSmallSpace(sizeof(struct VenusFid));
1868 *tvc->mvid = tvp->dotdot;
1873 ObtainWriteLock(&afs_xcbhash, 465);
1874 afs_DequeueCallback(tvc);
1875 tvc->states &= ~( CStatd | CUnique );
1876 ReleaseWriteLock(&afs_xcbhash);
1877 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
1878 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
1880 afs_PutVolume(tvp, READ_LOCK);
1881 ReleaseWriteLock(&tvc->lock);
1882 ObtainReadLock(&afs_xvcache);
1884 ReleaseReadLock(&afs_xvcache);
1885 return (struct vcache *) 0;
1888 ObtainWriteLock(&afs_xcbhash, 466);
1889 if (origCBs == afs_allCBs) {
1890 if (CallBack.ExpirationTime) {
1891 tvc->callback = serverp;
1892 tvc->cbExpires = CallBack.ExpirationTime+now;
1893 tvc->states |= CStatd | CUnique;
1894 tvc->states &= ~CBulkFetching;
1895 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvp);
1896 } else if (tvc->states & CRO) {
1897 /* adapt gives us an hour. */
1898 tvc->cbExpires = 3600+osi_Time(); /*XXX*/
1899 tvc->states |= CStatd | CUnique;
1900 tvc->states &= ~CBulkFetching;
1901 afs_QueueCallback(tvc, CBHash(3600), tvp);
1903 tvc->callback = (struct server *)0;
1904 afs_DequeueCallback(tvc);
1905 tvc->states &= ~(CStatd | CUnique);
1906 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
1907 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
1910 afs_DequeueCallback(tvc);
1911 tvc->states &= ~CStatd;
1912 tvc->states &= ~CUnique;
1913 tvc->callback = (struct server *)0;
1914 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
1915 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
1917 ReleaseWriteLock(&afs_xcbhash);
1919 afs_PutVolume(tvp, READ_LOCK);
1920 afs_ProcessFS(tvc, &OutStatus, areq);
1922 ReleaseWriteLock(&tvc->lock);
1923 #ifdef AFS_DARWIN_ENV
1930 struct vcache *afs_GetRootVCache(struct VenusFid *afid,
1931 struct vrequest *areq, afs_int32 *cached,
1932 struct volume *tvolp, afs_int32 locktype)
1934 afs_int32 code, i, newvcache = 0, haveStatus = 0;
1935 afs_int32 getNewFid = 0;
1937 struct VenusFid nfid;
1938 register struct vcache *tvc;
1939 struct server *serverp = 0;
1940 struct AFSFetchStatus OutStatus;
1941 struct AFSCallBack CallBack;
1942 struct AFSVolSync tsync;
1948 if (!tvolp->rootVnode || getNewFid) {
1949 struct VenusFid tfid;
1952 tfid.Fid.Vnode = 0; /* Means get rootfid of volume */
1953 origCBs = afs_allCBs; /* ignore InitCallBackState */
1954 code = afs_RemoteLookup(&tfid, areq, (char *)0, &nfid,
1955 &OutStatus, &CallBack, &serverp, &tsync);
1957 return (struct vcache *)0;
1959 /* ReleaseReadLock(&tvolp->lock); */
1960 ObtainWriteLock(&tvolp->lock,56);
1961 tvolp->rootVnode = afid->Fid.Vnode = nfid.Fid.Vnode;
1962 tvolp->rootUnique = afid->Fid.Unique = nfid.Fid.Unique;
1963 ReleaseWriteLock(&tvolp->lock);
1964 /* ObtainReadLock(&tvolp->lock);*/
1967 afid->Fid.Vnode = tvolp->rootVnode;
1968 afid->Fid.Unique = tvolp->rootUnique;
1971 ObtainSharedLock(&afs_xvcache,7);
1973 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
1974 if (!FidCmp(&(tvc->fid), afid)) {
1976 /* Grab this vnode, possibly reactivating from the free list */
1977 /* for the present (95.05.25) everything on the hash table is
1978 * definitively NOT in the free list -- at least until afs_reclaim
1979 * can be safely implemented */
1982 vg = vget(AFSTOV(tvc)); /* this bumps ref count */
1986 #endif /* AFS_OSF_ENV */
1991 if (!haveStatus && (!tvc || !(tvc->states & CStatd))) {
1992 /* Mount point no longer stat'd or unknown. FID may have changed. */
1997 tvc = (struct vcache*)0;
1999 ReleaseSharedLock(&afs_xvcache);
2004 UpgradeSToWLock(&afs_xvcache,23);
2005 /* no cache entry, better grab one */
2006 tvc = afs_NewVCache(afid, (struct server *)0, 1, WRITE_LOCK);
2008 afs_stats_cmperf.vcacheMisses++;
2011 if (cached) *cached = 1;
2012 afs_stats_cmperf.vcacheHits++;
2014 /* we already bumped the ref count in the for loop above */
2015 #else /* AFS_OSF_ENV */
2018 UpgradeSToWLock(&afs_xvcache,24);
2019 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2020 refpanic ("GRVC VLRU inconsistent0");
2022 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2023 refpanic ("GRVC VLRU inconsistent1");
2025 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2026 refpanic ("GRVC VLRU inconsistent2");
2028 QRemove(&tvc->vlruq); /* move to lruq head */
2029 QAdd(&VLRU, &tvc->vlruq);
2030 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2031 refpanic ("GRVC VLRU inconsistent3");
2033 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2034 refpanic ("GRVC VLRU inconsistent4");
2036 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2037 refpanic ("GRVC VLRU inconsistent5");
2042 ReleaseWriteLock(&afs_xvcache);
2044 if (tvc->states & CStatd) {
2048 ObtainReadLock(&tvc->lock);
2049 tvc->states &= ~CUnique;
2050 tvc->callback = (struct server *)0; /* redundant, perhaps */
2051 ReleaseReadLock(&tvc->lock);
2054 ObtainWriteLock(&tvc->lock,57);
2056 /* It is always appropriate to throw away all the access rights? */
2057 afs_FreeAllAxs(&(tvc->Access));
2059 if (newvcache) tvc->states |= CForeign;
2060 if (tvolp->states & VRO) tvc->states |= CRO;
2061 if (tvolp->states & VBackup) tvc->states |= CBackup;
2062 /* now copy ".." entry back out of volume structure, if necessary */
2063 if (newvcache && (tvolp->rootVnode == afid->Fid.Vnode)
2064 && (tvolp->rootUnique == afid->Fid.Unique)) {
2067 if (tvc->mvstat == 2 && tvolp->dotdot.Fid.Volume != 0) {
2069 tvc->mvid = (struct VenusFid *)osi_AllocSmallSpace(sizeof(struct VenusFid));
2070 *tvc->mvid = tvolp->dotdot;
2074 afs_RemoveVCB(afid);
2077 struct VenusFid tfid;
2080 tfid.Fid.Vnode = 0; /* Means get rootfid of volume */
2081 origCBs = afs_allCBs; /* ignore InitCallBackState */
2082 code = afs_RemoteLookup(&tfid, areq, (char *)0, &nfid, &OutStatus,
2083 &CallBack, &serverp, &tsync);
2087 ObtainWriteLock(&afs_xcbhash, 467);
2088 afs_DequeueCallback(tvc);
2089 tvc->callback = (struct server *)0;
2090 tvc->states &= ~(CStatd|CUnique);
2091 ReleaseWriteLock(&afs_xcbhash);
2092 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
2093 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
2094 ReleaseWriteLock(&tvc->lock);
2095 ObtainReadLock(&afs_xvcache);
2097 ReleaseReadLock(&afs_xvcache);
2098 return (struct vcache *) 0;
2101 ObtainWriteLock(&afs_xcbhash, 468);
2102 if (origCBs == afs_allCBs) {
2103 tvc->states |= CTruth;
2104 tvc->callback = serverp;
2105 if (CallBack.ExpirationTime != 0) {
2106 tvc->cbExpires = CallBack.ExpirationTime+start;
2107 tvc->states |= CStatd;
2108 tvc->states &= ~CBulkFetching;
2109 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvolp);
2110 } else if (tvc->states & CRO) {
2111 /* adapt gives us an hour. */
2112 tvc->cbExpires = 3600+osi_Time(); /*XXX*/
2113 tvc->states |= CStatd;
2114 tvc->states &= ~CBulkFetching;
2115 afs_QueueCallback(tvc, CBHash(3600), tvolp);
2118 afs_DequeueCallback(tvc);
2119 tvc->callback = (struct server *)0;
2120 tvc->states &= ~(CStatd | CUnique);
2121 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
2122 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
2124 ReleaseWriteLock(&afs_xcbhash);
2125 afs_ProcessFS(tvc, &OutStatus, areq);
2127 ReleaseWriteLock(&tvc->lock);
2134 * must be called with avc write-locked
2135 * don't absolutely have to invalidate the hint unless the dv has
2136 * changed, but be sure to get it right else there will be consistency bugs.
2138 afs_int32 afs_FetchStatus(struct vcache *avc, struct VenusFid *afid,
2139 struct vrequest *areq, struct AFSFetchStatus *Outsp)
2143 register struct conn *tc;
2144 struct AFSCallBack CallBack;
2145 struct AFSVolSync tsync;
2146 struct volume* volp;
2150 tc = afs_Conn(afid, areq, SHARED_LOCK);
2151 avc->quick.stamp = 0; avc->h1.dchint = NULL; /* invalidate hints */
2153 avc->callback = tc->srvr->server;
2155 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_FETCHSTATUS);
2157 code = RXAFS_FetchStatus(tc->id,
2158 (struct AFSFid *) &afid->Fid,
2159 Outsp, &CallBack, &tsync);
2167 (afs_Analyze(tc, code, afid, areq,
2168 AFS_STATS_FS_RPCIDX_FETCHSTATUS,
2169 SHARED_LOCK, (struct cell *)0));
2172 afs_ProcessFS(avc, Outsp, areq);
2173 volp = afs_GetVolume(afid, areq, READ_LOCK);
2174 ObtainWriteLock(&afs_xcbhash, 469);
2175 avc->states |= CTruth;
2176 if (avc->callback /* check for race */) {
2177 if (CallBack.ExpirationTime != 0) {
2178 avc->cbExpires = CallBack.ExpirationTime+start;
2179 avc->states |= CStatd;
2180 avc->states &= ~CBulkFetching;
2181 afs_QueueCallback(avc, CBHash(CallBack.ExpirationTime), volp);
2183 else if (avc->states & CRO)
2184 { /* ordinary callback on a read-only volume -- AFS 3.2 style */
2185 avc->cbExpires = 3600+start;
2186 avc->states |= CStatd;
2187 avc->states &= ~CBulkFetching;
2188 afs_QueueCallback(avc, CBHash(3600), volp);
2191 afs_DequeueCallback(avc);
2192 avc->callback = (struct server *)0;
2193 avc->states &= ~(CStatd|CUnique);
2194 if ((avc->states & CForeign) || (avc->fid.Fid.Vnode & 1))
2195 osi_dnlc_purgedp (avc); /* if it (could be) a directory */
2199 afs_DequeueCallback(avc);
2200 avc->callback = (struct server *)0;
2201 avc->states &= ~(CStatd|CUnique);
2202 if ((avc->states & CForeign) || (avc->fid.Fid.Vnode & 1))
2203 osi_dnlc_purgedp (avc); /* if it (could be) a directory */
2205 ReleaseWriteLock(&afs_xcbhash);
2207 afs_PutVolume(volp, READ_LOCK);
2209 else { /* used to undo the local callback, but that's too extreme.
2210 * There are plenty of good reasons that fetchstatus might return
2211 * an error, such as EPERM. If we have the vnode cached, statd,
2212 * with callback, might as well keep track of the fact that we
2213 * don't have access...
2215 if (code == EPERM || code == EACCES) {
2216 struct axscache *ac;
2217 if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid)))
2219 else /* not found, add a new one if possible */
2220 afs_AddAxs(avc->Access, areq->uid, 0);
2231 * Stuff some information into the vcache for the given file.
2234 * afid : File in question.
2235 * OutStatus : Fetch status on the file.
2236 * CallBack : Callback info.
2237 * tc : RPC connection involved.
2238 * areq : vrequest involved.
2241 * Nothing interesting.
2244 afs_StuffVcache(afid, OutStatus, CallBack, tc, areq)
2245 register struct VenusFid *afid;
2246 struct AFSFetchStatus *OutStatus;
2247 struct AFSCallBack *CallBack;
2248 register struct conn *tc;
2249 struct vrequest *areq;
2251 { /*afs_StuffVcache*/
2253 register afs_int32 code, i, newvcache=0;
2254 register struct vcache *tvc;
2255 struct AFSVolSync tsync;
2257 struct axscache *ac;
2260 AFS_STATCNT(afs_StuffVcache);
2261 #ifdef IFS_VCACHECOUNT
2266 ObtainSharedLock(&afs_xvcache,8);
2268 tvc = afs_FindVCache(afid, 0, 0, &retry, DO_VLRU /* no stats */);
2270 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
2271 ReleaseSharedLock(&afs_xvcache);
2272 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
2278 /* no cache entry, better grab one */
2279 UpgradeSToWLock(&afs_xvcache,25);
2280 tvc = afs_NewVCache(afid, (struct server *)0, 1, WRITE_LOCK);
2282 ConvertWToSLock(&afs_xvcache);
2285 ReleaseSharedLock(&afs_xvcache);
2286 ObtainWriteLock(&tvc->lock,58);
2288 tvc->states &= ~CStatd;
2289 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
2290 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
2292 /* Is it always appropriate to throw away all the access rights? */
2293 afs_FreeAllAxs(&(tvc->Access));
2295 /*Copy useful per-volume info*/
2296 tvp = afs_GetVolume(afid, areq, READ_LOCK);
2298 if (newvcache && (tvp->states & VForeign)) tvc->states |= CForeign;
2299 if (tvp->states & VRO) tvc->states |= CRO;
2300 if (tvp->states & VBackup) tvc->states |= CBackup;
2302 * Now, copy ".." entry back out of volume structure, if
2305 if (tvc->mvstat == 2 && tvp->dotdot.Fid.Volume != 0) {
2306 if (!tvc->mvid) tvc->mvid =
2307 (struct VenusFid *) osi_AllocSmallSpace(sizeof(struct VenusFid));
2308 *tvc->mvid = tvp->dotdot;
2311 /* store the stat on the file */
2312 afs_RemoveVCB(afid);
2313 afs_ProcessFS(tvc, OutStatus, areq);
2314 tvc->callback = tc->srvr->server;
2316 /* we use osi_Time twice below. Ideally, we would use the time at which
2317 * the FetchStatus call began, instead, but we don't have it here. So we
2318 * make do with "now". In the CRO case, it doesn't really matter. In
2319 * the other case, we hope that the difference between "now" and when the
2320 * call actually began execution on the server won't be larger than the
2321 * padding which the server keeps. Subtract 1 second anyway, to be on
2322 * the safe side. Can't subtract more because we don't know how big
2323 * ExpirationTime is. Possible consistency problems may arise if the call
2324 * timeout period becomes longer than the server's expiration padding. */
2325 ObtainWriteLock(&afs_xcbhash, 470);
2326 if (CallBack->ExpirationTime != 0) {
2327 tvc->cbExpires = CallBack->ExpirationTime+osi_Time()-1;
2328 tvc->states |= CStatd;
2329 tvc->states &= ~CBulkFetching;
2330 afs_QueueCallback(tvc, CBHash(CallBack->ExpirationTime), tvp);
2332 else if (tvc->states & CRO) {
2333 /* old-fashioned AFS 3.2 style */
2334 tvc->cbExpires = 3600+osi_Time(); /*XXX*/
2335 tvc->states |= CStatd;
2336 tvc->states &= ~CBulkFetching;
2337 afs_QueueCallback(tvc, CBHash(3600), tvp);
2340 afs_DequeueCallback(tvc);
2341 tvc->callback = (struct server *)0;
2342 tvc->states &= ~(CStatd|CUnique);
2343 if ((tvc->states & CForeign) || (tvc->fid.Fid.Vnode & 1))
2344 osi_dnlc_purgedp (tvc); /* if it (could be) a directory */
2346 ReleaseWriteLock(&afs_xcbhash);
2348 afs_PutVolume(tvp, READ_LOCK);
2350 /* look in per-pag cache */
2351 if (tvc->Access && (ac = afs_FindAxs(tvc->Access, areq->uid)))
2352 ac->axess = OutStatus->CallerAccess; /* substitute pags */
2353 else /* not found, add a new one if possible */
2354 afs_AddAxs(tvc->Access, areq->uid, OutStatus->CallerAccess);
2356 ReleaseWriteLock(&tvc->lock);
2357 afs_Trace4(afs_iclSetp, CM_TRACE_STUFFVCACHE, ICL_TYPE_POINTER, tvc,
2358 ICL_TYPE_POINTER, tvc->callback, ICL_TYPE_INT32, tvc->cbExpires,
2359 ICL_TYPE_INT32, tvc->cbExpires-osi_Time());
2361 * Release ref count... hope this guy stays around...
2363 afs_PutVCache(tvc, WRITE_LOCK);
2364 } /*afs_StuffVcache*/
2371 * Decrements the reference count on a cache entry.
2374 * avc : Pointer to the cache entry to decrement.
2377 * Nothing interesting.
2380 afs_PutVCache(avc, locktype)
2381 register struct vcache *avc;
2385 AFS_STATCNT(afs_PutVCache);
2387 * Can we use a read lock here?
2389 ObtainReadLock(&afs_xvcache);
2391 ReleaseReadLock(&afs_xvcache);
2398 * Find a vcache entry given a fid.
2401 * afid : Pointer to the fid whose cache entry we desire.
2402 * retry: (SGI-specific) tell the caller to drop the lock on xvcache,
2403 * unlock the vnode, and try again.
2404 * flags: bit 1 to specify whether to compute hit statistics. Not
2405 * set if FindVCache is called as part of internal bookkeeping.
2408 * Must be called with the afs_xvcache lock at least held at
2409 * the read level. In order to do the VLRU adjustment, the xvcache lock
2410 * must be shared-- we upgrade it here.
2413 struct vcache *afs_FindVCache(struct VenusFid *afid, afs_int32 lockit,
2414 afs_int32 locktype, afs_int32 *retry, afs_int32 flag)
2417 register struct vcache *tvc;
2420 AFS_STATCNT(afs_FindVCache);
2423 for(tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2424 if (FidMatches(afid, tvc)) {
2426 /* Grab this vnode, possibly reactivating from the free list */
2429 vg = vget(AFSTOV(tvc));
2433 #endif /* AFS_OSF_ENV */
2438 /* should I have a read lock on the vnode here? */
2440 if (retry) *retry = 0;
2441 #if !defined(AFS_OSF_ENV)
2442 osi_vnhold(tvc, retry); /* already held, above */
2443 if (retry && *retry)
2447 * only move to front of vlru if we have proper vcache locking)
2449 if (flag & DO_VLRU) {
2450 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2451 refpanic ("FindVC VLRU inconsistent1");
2453 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2454 refpanic ("FindVC VLRU inconsistent1");
2456 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2457 refpanic ("FindVC VLRU inconsistent2");
2459 UpgradeSToWLock(&afs_xvcache,26);
2460 QRemove(&tvc->vlruq);
2461 QAdd(&VLRU, &tvc->vlruq);
2462 ConvertWToSLock(&afs_xvcache);
2463 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2464 refpanic ("FindVC VLRU inconsistent1");
2466 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2467 refpanic ("FindVC VLRU inconsistent2");
2469 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2470 refpanic ("FindVC VLRU inconsistent3");
2476 if (flag & DO_STATS) {
2477 if (tvc) afs_stats_cmperf.vcacheHits++;
2478 else afs_stats_cmperf.vcacheMisses++;
2479 if (afid->Cell == LOCALCELL)
2480 afs_stats_cmperf.vlocalAccesses++;
2482 afs_stats_cmperf.vremoteAccesses++;
2485 #ifdef AFS_LINUX22_ENV
2486 if (tvc && (tvc->states & CStatd))
2487 vcache2inode(tvc); /* mainly to reset i_nlink */
2489 #ifdef AFS_DARWIN_ENV
2494 } /*afs_FindVCache*/
2500 * Find a vcache entry given a fid. Does a wildcard match on what we
2501 * have for the fid. If more than one entry, don't return anything.
2504 * avcp : Fill in pointer if we found one and only one.
2505 * afid : Pointer to the fid whose cache entry we desire.
2506 * retry: (SGI-specific) tell the caller to drop the lock on xvcache,
2507 * unlock the vnode, and try again.
2508 * flags: bit 1 to specify whether to compute hit statistics. Not
2509 * set if FindVCache is called as part of internal bookkeeping.
2512 * Must be called with the afs_xvcache lock at least held at
2513 * the read level. In order to do the VLRU adjustment, the xvcache lock
2514 * must be shared-- we upgrade it here.
2517 * number of matches found.
2520 int afs_duplicate_nfs_fids=0;
2522 afs_int32 afs_NFSFindVCache(avcp, afid, lockit)
2523 struct vcache **avcp;
2524 struct VenusFid *afid;
2526 { /*afs_FindVCache*/
2528 register struct vcache *tvc;
2530 afs_int32 retry = 0;
2531 afs_int32 count = 0;
2532 struct vcache *found_tvc = NULL;
2534 AFS_STATCNT(afs_FindVCache);
2538 ObtainSharedLock(&afs_xvcache,331);
2541 for(tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2542 /* Match only on what we have.... */
2543 if (((tvc->fid.Fid.Vnode & 0xffff) == afid->Fid.Vnode)
2544 && (tvc->fid.Fid.Volume == afid->Fid.Volume)
2545 && ((tvc->fid.Fid.Unique & 0xffffff) == afid->Fid.Unique)
2546 && (tvc->fid.Cell == afid->Cell)) {
2548 /* Grab this vnode, possibly reactivating from the free list */
2551 vg = vget(AFSTOV(tvc));
2554 /* This vnode no longer exists. */
2557 #endif /* AFS_OSF_ENV */
2562 /* Drop our reference counts. */
2564 vrele(AFSTOV(found_tvc));
2566 afs_duplicate_nfs_fids++;
2567 ReleaseSharedLock(&afs_xvcache);
2575 /* should I have a read lock on the vnode here? */
2577 #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV)
2578 osi_vnhold(tvc, &retry);
2581 found_tvc = (struct vcache*)0;
2582 ReleaseSharedLock(&afs_xvcache);
2583 spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD);
2587 #if !defined(AFS_OSF_ENV)
2588 osi_vnhold(tvc, (int*)0); /* already held, above */
2592 * We obtained the xvcache lock above.
2594 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2595 refpanic ("FindVC VLRU inconsistent1");
2597 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2598 refpanic ("FindVC VLRU inconsistent1");
2600 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2601 refpanic ("FindVC VLRU inconsistent2");
2603 UpgradeSToWLock(&afs_xvcache,568);
2604 QRemove(&tvc->vlruq);
2605 QAdd(&VLRU, &tvc->vlruq);
2606 ConvertWToSLock(&afs_xvcache);
2607 if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) {
2608 refpanic ("FindVC VLRU inconsistent1");
2610 if (tvc->vlruq.next->prev != &(tvc->vlruq)) {
2611 refpanic ("FindVC VLRU inconsistent2");
2613 if (tvc->vlruq.prev->next != &(tvc->vlruq)) {
2614 refpanic ("FindVC VLRU inconsistent3");
2619 if (tvc) afs_stats_cmperf.vcacheHits++;
2620 else afs_stats_cmperf.vcacheMisses++;
2621 if (afid->Cell == LOCALCELL)
2622 afs_stats_cmperf.vlocalAccesses++;
2624 afs_stats_cmperf.vremoteAccesses++;
2626 *avcp = tvc; /* May be null */
2628 ReleaseSharedLock(&afs_xvcache);
2629 return (tvc ? 1 : 0);
2631 } /*afs_NFSFindVCache*/
2639 * Initialize vcache related variables
2641 void afs_vcacheInit(int astatSize)
2643 register struct vcache *tvp;
2645 #if defined(AFS_OSF_ENV)
2646 if (!afs_maxvcount) {
2647 #if defined(AFS_OSF30_ENV)
2648 afs_maxvcount = max_vnodes/2; /* limit ourselves to half the total */
2650 afs_maxvcount = nvnode/2; /* limit ourselves to half the total */
2652 if (astatSize < afs_maxvcount) {
2653 afs_maxvcount = astatSize;
2656 #else /* AFS_OSF_ENV */
2657 freeVCList = (struct vcache *)0;
2660 RWLOCK_INIT(&afs_xvcache, "afs_xvcache");
2661 LOCK_INIT(&afs_xvcb, "afs_xvcb");
2663 #if !defined(AFS_OSF_ENV)
2664 /* Allocate and thread the struct vcache entries */
2665 tvp = (struct vcache *) afs_osi_Alloc(astatSize * sizeof(struct vcache));
2666 memset((char *)tvp, 0, sizeof(struct vcache)*astatSize);
2668 Initial_freeVCList = tvp;
2669 freeVCList = &(tvp[0]);
2670 for(i=0; i < astatSize-1; i++) {
2671 tvp[i].nextfree = &(tvp[i+1]);
2673 tvp[astatSize-1].nextfree = (struct vcache *) 0;
2674 #ifdef AFS_AIX32_ENV
2675 pin((char *)tvp, astatSize * sizeof(struct vcache)); /* XXX */
2680 #if defined(AFS_SGI_ENV)
2681 for(i=0; i < astatSize; i++) {
2682 char name[METER_NAMSZ];
2683 struct vcache *tvc = &tvp[i];
2685 tvc->v.v_number = ++afsvnumbers;
2686 tvc->vc_rwlockid = OSI_NO_LOCKID;
2687 initnsema(&tvc->vc_rwlock, 1, makesname(name, "vrw", tvc->v.v_number));
2688 #ifndef AFS_SGI53_ENV
2689 initnsema(&tvc->v.v_sync, 0, makesname(name, "vsy", tvc->v.v_number));
2691 #ifndef AFS_SGI62_ENV
2692 initnlock(&tvc->v.v_lock, makesname(name, "vlk", tvc->v.v_number));
2693 #endif /* AFS_SGI62_ENV */
2706 void shutdown_vcache(void)
2709 struct afs_cbr *tsp, *nsp;
2711 * XXX We may potentially miss some of the vcaches because if when there're no
2712 * free vcache entries and all the vcache entries are active ones then we allocate
2713 * an additional one - admittedly we almost never had that occur.
2715 #if !defined(AFS_OSF_ENV)
2716 afs_osi_Free(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache));
2718 #ifdef AFS_AIX32_ENV
2719 unpin(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache));
2723 register struct afs_q *tq, *uq;
2724 register struct vcache *tvc;
2725 for (tq = VLRU.prev; tq != &VLRU; tq = uq) {
2729 osi_FreeSmallSpace(tvc->mvid);
2730 tvc->mvid = (struct VenusFid*)0;
2733 aix_gnode_rele(AFSTOV(tvc));
2735 if (tvc->linkData) {
2736 afs_osi_Free(tvc->linkData, strlen(tvc->linkData)+1);
2741 * Also free the remaining ones in the Cache
2743 for (i=0; i < VCSIZE; i++) {
2744 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
2746 osi_FreeSmallSpace(tvc->mvid);
2747 tvc->mvid = (struct VenusFid*)0;
2751 afs_osi_Free(tvc->v.v_gnode, sizeof(struct gnode));
2752 #ifdef AFS_AIX32_ENV
2755 vms_delete(tvc->segid);
2757 tvc->segid = tvc->vmh = NULL;
2758 if (VREFCOUNT(tvc)) osi_Panic("flushVcache: vm race");
2766 #if defined(AFS_SUN5_ENV)
2772 if (tvc->linkData) {
2773 afs_osi_Free(tvc->linkData, strlen(tvc->linkData)+1);
2777 afs_FreeAllAxs(&(tvc->Access));
2783 * Free any leftover callback queue
2785 for (tsp = afs_cbrSpace; tsp; tsp = nsp ) {
2787 afs_osi_Free((char *)tsp, AFS_NCBRS * sizeof(struct afs_cbr));
2791 #if !defined(AFS_OSF_ENV)
2792 freeVCList = Initial_freeVCList = 0;
2794 RWLOCK_INIT(&afs_xvcache, "afs_xvcache");
2795 LOCK_INIT(&afs_xvcb, "afs_xvcb");