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805e021f CE |
1 | /* |
2 | * Copyright 2000, International Business Machines Corporation and others. | |
3 | * All Rights Reserved. | |
4 | * | |
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 | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Implements: | |
12 | * afs_FlushVCache | |
13 | * afs_AllocCBR | |
14 | * afs_FreeCBR | |
15 | * afs_FlushVCBs | |
16 | * afs_QueueVCB | |
17 | * afs_RemoveVCB | |
18 | * afs_NewVCache | |
19 | * afs_FlushActiveVcaches | |
20 | * afs_VerifyVCache2 | |
21 | * afs_WriteVCache | |
22 | * afs_WriteVCacheDiscon | |
23 | * afs_SimpleVStat | |
24 | * afs_ProcessFS | |
25 | * TellALittleWhiteLie | |
26 | * afs_RemoteLookup | |
27 | * afs_GetVCache | |
28 | * afs_LookupVCache | |
29 | * afs_GetRootVCache | |
30 | * afs_UpdateStatus | |
31 | * afs_FetchStatus | |
32 | * afs_StuffVcache | |
33 | * afs_PutVCache | |
34 | * afs_FindVCache | |
35 | * afs_NFSFindVCache | |
36 | * afs_vcacheInit | |
37 | * shutdown_vcache | |
38 | * | |
39 | */ | |
40 | #include <afsconfig.h> | |
41 | #include "afs/param.h" | |
42 | ||
43 | #include "afs/sysincludes.h" /*Standard vendor system headers */ | |
44 | #include "afsincludes.h" /*AFS-based standard headers */ | |
45 | #include "afs/afs_stats.h" | |
46 | #include "afs/afs_cbqueue.h" | |
47 | #include "afs/afs_osidnlc.h" | |
48 | ||
49 | afs_int32 afs_maxvcount = 0; /* max number of vcache entries */ | |
50 | afs_int32 afs_vcount = 0; /* number of vcache in use now */ | |
51 | ||
52 | #ifdef AFS_SGI_ENV | |
53 | int afsvnumbers = 0; | |
54 | #endif | |
55 | ||
56 | #ifdef AFS_SGI64_ENV | |
57 | char *makesname(); | |
58 | #endif /* AFS_SGI64_ENV */ | |
59 | ||
60 | /* Exported variables */ | |
61 | afs_rwlock_t afs_xvcdirty; /*Lock: discon vcache dirty list mgmt */ | |
62 | afs_rwlock_t afs_xvcache; /*Lock: alloc new stat cache entries */ | |
63 | afs_rwlock_t afs_xvreclaim; /*Lock: entries reclaimed, not on free list */ | |
64 | afs_lock_t afs_xvcb; /*Lock: fids on which there are callbacks */ | |
65 | #if !defined(AFS_LINUX22_ENV) | |
66 | static struct vcache *freeVCList; /*Free list for stat cache entries */ | |
67 | struct vcache *ReclaimedVCList; /*Reclaimed list for stat entries */ | |
68 | static struct vcache *Initial_freeVCList; /*Initial list for above */ | |
69 | #endif | |
70 | struct afs_q VLRU; /*vcache LRU */ | |
71 | afs_int32 vcachegen = 0; | |
72 | unsigned int afs_paniconwarn = 0; | |
73 | struct vcache *afs_vhashT[VCSIZE]; | |
74 | struct afs_q afs_vhashTV[VCSIZE]; | |
75 | static struct afs_cbr *afs_cbrHashT[CBRSIZE]; | |
76 | afs_int32 afs_bulkStatsLost; | |
77 | int afs_norefpanic = 0; | |
78 | ||
79 | ||
80 | /* Disk backed vcache definitions | |
81 | * Both protected by xvcache */ | |
82 | static int afs_nextVcacheSlot = 0; | |
83 | static struct afs_slotlist *afs_freeSlotList = NULL; | |
84 | ||
85 | /* Forward declarations */ | |
86 | static afs_int32 afs_QueueVCB(struct vcache *avc, int *slept); | |
87 | ||
88 | ||
89 | /* | |
90 | * The PFlush algorithm makes use of the fact that Fid.Unique is not used in | |
91 | * below hash algorithms. Change it if need be so that flushing algorithm | |
92 | * doesn't move things from one hash chain to another. | |
93 | */ | |
94 | /* Don't hash on the cell; our callback-breaking code sometimes fails to compute | |
95 | * the cell correctly, and only scans one hash bucket. */ | |
96 | int VCHash(struct VenusFid *fid) | |
97 | { | |
98 | return opr_jhash_int2(fid->Fid.Volume, fid->Fid.Vnode, 0) & | |
99 | opr_jhash_mask(VCSIZEBITS); | |
100 | } | |
101 | /* Hash only on volume to speed up volume callbacks. */ | |
102 | int VCHashV(struct VenusFid *fid) | |
103 | { | |
104 | return opr_jhash_int(fid->Fid.Volume, 0) & opr_jhash_mask(VCSIZEBITS); | |
105 | } | |
106 | ||
107 | /*! | |
108 | * Generate an index into the hash table for a given Fid. | |
109 | * \param fid | |
110 | * \return The hash value. | |
111 | */ | |
112 | static int | |
113 | afs_HashCBRFid(struct AFSFid *fid) | |
114 | { | |
115 | return (fid->Volume + fid->Vnode + fid->Unique) % CBRSIZE; | |
116 | } | |
117 | ||
118 | /*! | |
119 | * Insert a CBR entry into the hash table. | |
120 | * Must be called with afs_xvcb held. | |
121 | * \param cbr | |
122 | * \return | |
123 | */ | |
124 | static void | |
125 | afs_InsertHashCBR(struct afs_cbr *cbr) | |
126 | { | |
127 | int slot = afs_HashCBRFid(&cbr->fid); | |
128 | ||
129 | cbr->hash_next = afs_cbrHashT[slot]; | |
130 | if (afs_cbrHashT[slot]) | |
131 | afs_cbrHashT[slot]->hash_pprev = &cbr->hash_next; | |
132 | ||
133 | cbr->hash_pprev = &afs_cbrHashT[slot]; | |
134 | afs_cbrHashT[slot] = cbr; | |
135 | } | |
136 | ||
137 | /*! | |
138 | * | |
139 | * Flush the given vcache entry. | |
140 | * | |
141 | * Environment: | |
142 | * afs_xvcache lock must be held for writing upon entry to | |
143 | * prevent people from changing the vrefCount field, and to | |
144 | * protect the lruq and hnext fields. | |
145 | * LOCK: afs_FlushVCache afs_xvcache W | |
146 | * REFCNT: vcache ref count must be zero on entry except for osf1 | |
147 | * RACE: lock is dropped and reobtained, permitting race in caller | |
148 | * | |
149 | * \param avc Pointer to vcache entry to flush. | |
150 | * \param slept Pointer to int to set 1 if we sleep/drop locks, 0 if we don't. | |
151 | * | |
152 | */ | |
153 | int | |
154 | afs_FlushVCache(struct vcache *avc, int *slept) | |
155 | { /*afs_FlushVCache */ | |
156 | ||
157 | afs_int32 i, code; | |
158 | struct vcache **uvc, *wvc; | |
159 | ||
160 | /* NOTE: We must have nothing drop afs_xvcache until we have removed all | |
161 | * possible references to this vcache. This means all hash tables, queues, | |
162 | * DNLC, etc. */ | |
163 | ||
164 | *slept = 0; | |
165 | AFS_STATCNT(afs_FlushVCache); | |
166 | afs_Trace2(afs_iclSetp, CM_TRACE_FLUSHV, ICL_TYPE_POINTER, avc, | |
167 | ICL_TYPE_INT32, avc->f.states); | |
168 | ||
169 | code = osi_VM_FlushVCache(avc); | |
170 | if (code) | |
171 | goto bad; | |
172 | ||
173 | if (avc->f.states & CVFlushed) { | |
174 | code = EBUSY; | |
175 | goto bad; | |
176 | } | |
177 | #if !defined(AFS_LINUX22_ENV) | |
178 | if (avc->nextfree || !avc->vlruq.prev || !avc->vlruq.next) { /* qv afs.h */ | |
179 | refpanic("LRU vs. Free inconsistency"); | |
180 | } | |
181 | #endif | |
182 | avc->f.states |= CVFlushed; | |
183 | /* pull the entry out of the lruq and put it on the free list */ | |
184 | QRemove(&avc->vlruq); | |
185 | ||
186 | /* keep track of # of files that we bulk stat'd, but never used | |
187 | * before they got recycled. | |
188 | */ | |
189 | if (avc->f.states & CBulkStat) | |
190 | afs_bulkStatsLost++; | |
191 | vcachegen++; | |
192 | /* remove entry from the hash chain */ | |
193 | i = VCHash(&avc->f.fid); | |
194 | uvc = &afs_vhashT[i]; | |
195 | for (wvc = *uvc; wvc; uvc = &wvc->hnext, wvc = *uvc) { | |
196 | if (avc == wvc) { | |
197 | *uvc = avc->hnext; | |
198 | avc->hnext = NULL; | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
203 | /* remove entry from the volume hash table */ | |
204 | QRemove(&avc->vhashq); | |
205 | ||
206 | #if defined(AFS_LINUX26_ENV) | |
207 | { | |
208 | struct pagewriter *pw, *store; | |
209 | struct list_head tofree; | |
210 | ||
211 | INIT_LIST_HEAD(&tofree); | |
212 | spin_lock(&avc->pagewriter_lock); | |
213 | list_for_each_entry_safe(pw, store, &avc->pagewriters, link) { | |
214 | list_del(&pw->link); | |
215 | /* afs_osi_Free may sleep so we need to defer it */ | |
216 | list_add_tail(&pw->link, &tofree); | |
217 | } | |
218 | spin_unlock(&avc->pagewriter_lock); | |
219 | list_for_each_entry_safe(pw, store, &tofree, link) { | |
220 | list_del(&pw->link); | |
221 | afs_osi_Free(pw, sizeof(struct pagewriter)); | |
222 | } | |
223 | } | |
224 | #endif | |
225 | ||
226 | if (avc->mvid.target_root) | |
227 | osi_FreeSmallSpace(avc->mvid.target_root); | |
228 | avc->mvid.target_root = NULL; | |
229 | if (avc->linkData) { | |
230 | afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1); | |
231 | avc->linkData = NULL; | |
232 | } | |
233 | #if defined(AFS_XBSD_ENV) || defined(AFS_DARWIN_ENV) | |
234 | /* OK, there are no internal vrefCounts, so there shouldn't | |
235 | * be any more refs here. */ | |
236 | if (avc->v) { | |
237 | #ifdef AFS_DARWIN80_ENV | |
238 | vnode_clearfsnode(AFSTOV(avc)); | |
239 | vnode_removefsref(AFSTOV(avc)); | |
240 | #else | |
241 | avc->v->v_data = NULL; /* remove from vnode */ | |
242 | #endif | |
243 | AFSTOV(avc) = NULL; /* also drop the ptr to vnode */ | |
244 | } | |
245 | #endif | |
246 | ||
247 | #ifdef AFS_SUN511_ENV | |
248 | if (avc->v) { | |
249 | vn_free(avc->v); | |
250 | avc->v = NULL; | |
251 | } | |
252 | #elif defined(AFS_SUN510_ENV) | |
253 | /* As we use private vnodes, cleanup is up to us */ | |
254 | vn_reinit(AFSTOV(avc)); | |
255 | #endif | |
256 | afs_FreeAllAxs(&(avc->Access)); | |
257 | afs_StaleVCacheFlags(avc, AFS_STALEVC_FILENAME, CUnique); | |
258 | ||
259 | /* By this point, the vcache has been removed from all global structures | |
260 | * via which someone could try to use the vcache. It is okay to drop | |
261 | * afs_xvcache at this point (if *slept is set). */ | |
262 | ||
263 | if (afs_shuttingdown == AFS_RUNNING) | |
264 | afs_QueueVCB(avc, slept); | |
265 | ||
266 | /* | |
267 | * Next, keep track of which vnodes we've deleted for create's | |
268 | * optimistic synchronization algorithm | |
269 | */ | |
270 | afs_allZaps++; | |
271 | if (avc->f.fid.Fid.Vnode & 1) | |
272 | afs_oddZaps++; | |
273 | else | |
274 | afs_evenZaps++; | |
275 | ||
276 | afs_vcount--; | |
277 | #if !defined(AFS_LINUX22_ENV) | |
278 | /* put the entry in the free list */ | |
279 | avc->nextfree = freeVCList; | |
280 | freeVCList = avc; | |
281 | if (avc->vlruq.prev || avc->vlruq.next) { | |
282 | refpanic("LRU vs. Free inconsistency"); | |
283 | } | |
284 | avc->f.states |= CVFlushed; | |
285 | #else | |
286 | /* This should put it back on the vnode free list since usecount is 1 */ | |
287 | vSetType(avc, VREG); | |
288 | if (VREFCOUNT_GT(avc,0)) { | |
289 | AFS_RELE(AFSTOV(avc)); | |
290 | afs_stats_cmperf.vcacheXAllocs--; | |
291 | } else { | |
292 | if (afs_norefpanic) { | |
293 | afs_warn("flush vc refcnt < 1"); | |
294 | afs_norefpanic++; | |
295 | } else | |
296 | osi_Panic("flush vc refcnt < 1"); | |
297 | } | |
298 | #endif /* AFS_LINUX22_ENV */ | |
299 | return 0; | |
300 | ||
301 | bad: | |
302 | return code; | |
303 | } /*afs_FlushVCache */ | |
304 | ||
305 | #ifndef AFS_SGI_ENV | |
306 | /*! | |
307 | * The core of the inactive vnode op for all but IRIX. | |
308 | * | |
309 | * \param avc | |
310 | * \param acred | |
311 | */ | |
312 | void | |
313 | afs_InactiveVCache(struct vcache *avc, afs_ucred_t *acred) | |
314 | { | |
315 | AFS_STATCNT(afs_inactive); | |
316 | if (avc->f.states & CDirty) { | |
317 | /* we can't keep trying to push back dirty data forever. Give up. */ | |
318 | afs_InvalidateAllSegments(avc); /* turns off dirty bit */ | |
319 | } | |
320 | avc->f.states &= ~CMAPPED; /* mainly used by SunOS 4.0.x */ | |
321 | avc->f.states &= ~CDirty; /* Turn it off */ | |
322 | if (avc->f.states & CUnlinked) { | |
323 | if (CheckLock(&afs_xvcache) || CheckLock(&afs_xdcache)) { | |
324 | avc->f.states |= CUnlinkedDel; | |
325 | return; | |
326 | } | |
327 | afs_remunlink(avc, 1); /* ignore any return code */ | |
328 | } | |
329 | ||
330 | } | |
331 | #endif | |
332 | ||
333 | /*! | |
334 | * Allocate a callback return structure from the | |
335 | * free list and return it. | |
336 | * | |
337 | * Environment: The alloc and free routines are both called with the afs_xvcb lock | |
338 | * held, so we don't have to worry about blocking in osi_Alloc. | |
339 | * | |
340 | * \return The allocated afs_cbr. | |
341 | */ | |
342 | static struct afs_cbr *afs_cbrSpace = 0; | |
343 | /* if alloc limit below changes, fix me! */ | |
344 | static struct afs_cbr *afs_cbrHeads[16]; | |
345 | struct afs_cbr * | |
346 | afs_AllocCBR(void) | |
347 | { | |
348 | struct afs_cbr *tsp; | |
349 | int i; | |
350 | ||
351 | while (!afs_cbrSpace) { | |
352 | if (afs_stats_cmperf.CallBackAlloced >= sizeof(afs_cbrHeads)/sizeof(afs_cbrHeads[0])) { | |
353 | /* don't allocate more than 16 * AFS_NCBRS for now */ | |
354 | afs_FlushVCBs(0); | |
355 | afs_stats_cmperf.CallBackFlushes++; | |
356 | } else { | |
357 | /* try allocating */ | |
358 | tsp = afs_osi_Alloc(AFS_NCBRS * sizeof(struct afs_cbr)); | |
359 | osi_Assert(tsp != NULL); | |
360 | for (i = 0; i < AFS_NCBRS - 1; i++) { | |
361 | tsp[i].next = &tsp[i + 1]; | |
362 | } | |
363 | tsp[AFS_NCBRS - 1].next = 0; | |
364 | afs_cbrSpace = tsp; | |
365 | afs_cbrHeads[afs_stats_cmperf.CallBackAlloced] = tsp; | |
366 | afs_stats_cmperf.CallBackAlloced++; | |
367 | } | |
368 | } | |
369 | tsp = afs_cbrSpace; | |
370 | afs_cbrSpace = tsp->next; | |
371 | return tsp; | |
372 | } | |
373 | ||
374 | /*! | |
375 | * Free a callback return structure, removing it from all lists. | |
376 | * | |
377 | * Environment: the xvcb lock is held over these calls. | |
378 | * | |
379 | * \param asp The address of the structure to free. | |
380 | * | |
381 | * \rerurn 0 | |
382 | */ | |
383 | int | |
384 | afs_FreeCBR(struct afs_cbr *asp) | |
385 | { | |
386 | *(asp->pprev) = asp->next; | |
387 | if (asp->next) | |
388 | asp->next->pprev = asp->pprev; | |
389 | ||
390 | *(asp->hash_pprev) = asp->hash_next; | |
391 | if (asp->hash_next) | |
392 | asp->hash_next->hash_pprev = asp->hash_pprev; | |
393 | ||
394 | asp->next = afs_cbrSpace; | |
395 | afs_cbrSpace = asp; | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static void | |
400 | FlushAllVCBs(int nconns, struct rx_connection **rxconns, | |
401 | struct afs_conn **conns) | |
402 | { | |
403 | afs_int32 *results; | |
404 | afs_int32 i; | |
405 | ||
406 | results = afs_osi_Alloc(nconns * sizeof (afs_int32)); | |
407 | osi_Assert(results != NULL); | |
408 | ||
409 | AFS_GUNLOCK(); | |
410 | multi_Rx(rxconns,nconns) | |
411 | { | |
412 | multi_RXAFS_GiveUpAllCallBacks(); | |
413 | results[multi_i] = multi_error; | |
414 | } multi_End; | |
415 | AFS_GLOCK(); | |
416 | ||
417 | /* | |
418 | * Freeing the CBR will unlink it from the server's CBR list | |
419 | * do it here, not in the loop, because a dynamic CBR will call | |
420 | * into the memory management routines. | |
421 | */ | |
422 | for ( i = 0 ; i < nconns ; i++ ) { | |
423 | if (results[i] == 0) { | |
424 | /* Unchain all of them */ | |
425 | while (conns[i]->parent->srvr->server->cbrs) | |
426 | afs_FreeCBR(conns[i]->parent->srvr->server->cbrs); | |
427 | } | |
428 | } | |
429 | afs_osi_Free(results, nconns * sizeof(afs_int32)); | |
430 | } | |
431 | ||
432 | /*! | |
433 | * Flush all queued callbacks to all servers. | |
434 | * | |
435 | * Environment: holds xvcb lock over RPC to guard against race conditions | |
436 | * when a new callback is granted for the same file later on. | |
437 | * | |
438 | * \return 0 for success. | |
439 | */ | |
440 | afs_int32 | |
441 | afs_FlushVCBs(afs_int32 lockit) | |
442 | { | |
443 | struct AFSFid *tfids; | |
444 | struct AFSCallBack callBacks[1]; | |
445 | struct AFSCBFids fidArray; | |
446 | struct AFSCBs cbArray; | |
447 | afs_int32 code; | |
448 | struct afs_cbr *tcbrp; | |
449 | int tcount; | |
450 | struct server *tsp; | |
451 | int i; | |
452 | struct vrequest *treq = NULL; | |
453 | struct afs_conn *tc; | |
454 | int safety1, safety2, safety3; | |
455 | XSTATS_DECLS; | |
456 | ||
457 | if (AFS_IS_DISCONNECTED) | |
458 | return ENETDOWN; | |
459 | ||
460 | if ((code = afs_CreateReq(&treq, afs_osi_credp))) | |
461 | return code; | |
462 | treq->flags |= O_NONBLOCK; | |
463 | tfids = afs_osi_Alloc(sizeof(struct AFSFid) * AFS_MAXCBRSCALL); | |
464 | osi_Assert(tfids != NULL); | |
465 | ||
466 | if (lockit) | |
467 | ObtainWriteLock(&afs_xvcb, 273); | |
468 | /* | |
469 | * Shutting down. | |
470 | * First, attempt a multi across everything, all addresses | |
471 | * for all servers we know of. | |
472 | */ | |
473 | ||
474 | if (lockit == 2) | |
475 | afs_LoopServers(AFS_LS_ALL, NULL, 0, FlushAllVCBs, NULL); | |
476 | ||
477 | ObtainReadLock(&afs_xserver); | |
478 | for (i = 0; i < NSERVERS; i++) { | |
479 | for (safety1 = 0, tsp = afs_servers[i]; | |
480 | tsp && safety1 < afs_totalServers + 10; | |
481 | tsp = tsp->next, safety1++) { | |
482 | /* don't have any */ | |
483 | if (tsp->cbrs == (struct afs_cbr *)0) | |
484 | continue; | |
485 | ||
486 | /* otherwise, grab a block of AFS_MAXCBRSCALL from the list | |
487 | * and make an RPC, over and over again. | |
488 | */ | |
489 | tcount = 0; /* number found so far */ | |
490 | for (safety2 = 0; safety2 < afs_cacheStats; safety2++) { | |
491 | if (tcount >= AFS_MAXCBRSCALL || !tsp->cbrs) { | |
492 | struct rx_connection *rxconn; | |
493 | /* if buffer is full, or we've queued all we're going | |
494 | * to from this server, we should flush out the | |
495 | * callbacks. | |
496 | */ | |
497 | fidArray.AFSCBFids_len = tcount; | |
498 | fidArray.AFSCBFids_val = (struct AFSFid *)tfids; | |
499 | cbArray.AFSCBs_len = 1; | |
500 | cbArray.AFSCBs_val = callBacks; | |
501 | memset(&callBacks[0], 0, sizeof(callBacks[0])); | |
502 | callBacks[0].CallBackType = CB_EXCLUSIVE; | |
503 | for (safety3 = 0; safety3 < AFS_MAXHOSTS * 2; safety3++) { | |
504 | tc = afs_ConnByHost(tsp, tsp->cell->fsport, | |
505 | tsp->cell->cellNum, treq, 0, | |
506 | SHARED_LOCK, 0, &rxconn); | |
507 | if (tc) { | |
508 | XSTATS_START_TIME | |
509 | (AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS); | |
510 | RX_AFS_GUNLOCK(); | |
511 | code = | |
512 | RXAFS_GiveUpCallBacks(rxconn, &fidArray, | |
513 | &cbArray); | |
514 | RX_AFS_GLOCK(); | |
515 | XSTATS_END_TIME; | |
516 | } else | |
517 | code = -1; | |
518 | if (!afs_Analyze | |
519 | (tc, rxconn, code, 0, treq, | |
520 | AFS_STATS_FS_RPCIDX_GIVEUPCALLBACKS, SHARED_LOCK, | |
521 | tsp->cell)) { | |
522 | break; | |
523 | } | |
524 | } | |
525 | /* ignore return code, since callbacks may have | |
526 | * been returned anyway, we shouldn't leave them | |
527 | * around to be returned again. | |
528 | * | |
529 | * Next, see if we are done with this server, and if so, | |
530 | * break to deal with the next one. | |
531 | */ | |
532 | if (!tsp->cbrs) | |
533 | break; | |
534 | tcount = 0; | |
535 | } | |
536 | /* if to flush full buffer */ | |
537 | /* if we make it here, we have an entry at the head of cbrs, | |
538 | * which we should copy to the file ID array and then free. | |
539 | */ | |
540 | tcbrp = tsp->cbrs; | |
541 | tfids[tcount++] = tcbrp->fid; | |
542 | ||
543 | /* Freeing the CBR will unlink it from the server's CBR list */ | |
544 | afs_FreeCBR(tcbrp); | |
545 | } /* while loop for this one server */ | |
546 | if (safety2 > afs_cacheStats) { | |
547 | afs_warn("possible internal error afs_flushVCBs (%d)\n", | |
548 | safety2); | |
549 | } | |
550 | } /* for loop for this hash chain */ | |
551 | } /* loop through all hash chains */ | |
552 | if (safety1 > afs_totalServers + 2) { | |
553 | afs_warn | |
554 | ("AFS internal error (afs_flushVCBs) (%d > %d), continuing...\n", | |
555 | safety1, afs_totalServers + 2); | |
556 | if (afs_paniconwarn) | |
557 | osi_Panic("afs_flushVCBS safety1"); | |
558 | } | |
559 | ||
560 | ReleaseReadLock(&afs_xserver); | |
561 | if (lockit) | |
562 | ReleaseWriteLock(&afs_xvcb); | |
563 | afs_osi_Free(tfids, sizeof(struct AFSFid) * AFS_MAXCBRSCALL); | |
564 | afs_DestroyReq(treq); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /*! | |
569 | * Queue a callback on the given fid. | |
570 | * | |
571 | * Environment: | |
572 | * Locks the xvcb lock. | |
573 | * Called when the xvcache lock is already held. | |
574 | * RACE: afs_xvcache may be dropped and reacquired | |
575 | * | |
576 | * \param avc vcache entry | |
577 | * \param slep Set to 1 if we dropped afs_xvcache | |
578 | * \return 1 if queued, 0 otherwise | |
579 | */ | |
580 | ||
581 | static afs_int32 | |
582 | afs_QueueVCB(struct vcache *avc, int *slept) | |
583 | { | |
584 | int queued = 0; | |
585 | struct server *tsp; | |
586 | struct afs_cbr *tcbp; | |
587 | int reacquire = 0; | |
588 | ||
589 | AFS_STATCNT(afs_QueueVCB); | |
590 | ||
591 | ObtainWriteLock(&afs_xvcb, 274); | |
592 | ||
593 | /* we can't really give back callbacks on RO files, since the | |
594 | * server only tracks them on a per-volume basis, and we don't | |
595 | * know whether we still have some other files from the same | |
596 | * volume. */ | |
597 | if (!((avc->f.states & CRO) == 0 && avc->callback)) { | |
598 | goto done; | |
599 | } | |
600 | ||
601 | /* The callback is really just a struct server ptr. */ | |
602 | tsp = (struct server *)(avc->callback); | |
603 | ||
604 | if (!afs_cbrSpace) { | |
605 | /* If we don't have CBR space, AllocCBR may block or hit the net for | |
606 | * clearing up CBRs. Hitting the net may involve a fileserver | |
607 | * needing to contact us, so we must drop xvcache so we don't block | |
608 | * those requests from going through. */ | |
609 | reacquire = *slept = 1; | |
610 | ReleaseWriteLock(&afs_xvcache); | |
611 | } | |
612 | ||
613 | /* we now have a pointer to the server, so we just allocate | |
614 | * a queue entry and queue it. | |
615 | */ | |
616 | tcbp = afs_AllocCBR(); | |
617 | tcbp->fid = avc->f.fid.Fid; | |
618 | ||
619 | tcbp->next = tsp->cbrs; | |
620 | if (tsp->cbrs) | |
621 | tsp->cbrs->pprev = &tcbp->next; | |
622 | ||
623 | tsp->cbrs = tcbp; | |
624 | tcbp->pprev = &tsp->cbrs; | |
625 | ||
626 | afs_InsertHashCBR(tcbp); | |
627 | queued = 1; | |
628 | ||
629 | done: | |
630 | /* now release locks and return */ | |
631 | ReleaseWriteLock(&afs_xvcb); | |
632 | ||
633 | if (reacquire) { | |
634 | /* make sure this is after dropping xvcb, for locking order */ | |
635 | ObtainWriteLock(&afs_xvcache, 279); | |
636 | } | |
637 | return queued; | |
638 | } | |
639 | ||
640 | ||
641 | /*! | |
642 | * Remove a queued callback for a given Fid. | |
643 | * | |
644 | * Environment: | |
645 | * Locks xvcb and xserver locks. | |
646 | * Typically called with xdcache, xvcache and/or individual vcache | |
647 | * entries locked. | |
648 | * | |
649 | * \param afid The fid we want cleansed of queued callbacks. | |
650 | * | |
651 | */ | |
652 | ||
653 | void | |
654 | afs_RemoveVCB(struct VenusFid *afid) | |
655 | { | |
656 | int slot; | |
657 | struct afs_cbr *cbr, *ncbr; | |
658 | ||
659 | AFS_STATCNT(afs_RemoveVCB); | |
660 | ObtainWriteLock(&afs_xvcb, 275); | |
661 | ||
662 | slot = afs_HashCBRFid(&afid->Fid); | |
663 | ncbr = afs_cbrHashT[slot]; | |
664 | ||
665 | while (ncbr) { | |
666 | cbr = ncbr; | |
667 | ncbr = cbr->hash_next; | |
668 | ||
669 | if (afid->Fid.Volume == cbr->fid.Volume && | |
670 | afid->Fid.Vnode == cbr->fid.Vnode && | |
671 | afid->Fid.Unique == cbr->fid.Unique) { | |
672 | afs_FreeCBR(cbr); | |
673 | } | |
674 | } | |
675 | ||
676 | ReleaseWriteLock(&afs_xvcb); | |
677 | } | |
678 | ||
679 | void | |
680 | afs_FlushReclaimedVcaches(void) | |
681 | { | |
682 | #if !defined(AFS_LINUX22_ENV) | |
683 | struct vcache *tvc; | |
684 | int code, fv_slept; | |
685 | struct vcache *tmpReclaimedVCList = NULL; | |
686 | ||
687 | ObtainWriteLock(&afs_xvreclaim, 76); | |
688 | while (ReclaimedVCList) { | |
689 | tvc = ReclaimedVCList; /* take from free list */ | |
690 | ReclaimedVCList = tvc->nextfree; | |
691 | tvc->nextfree = NULL; | |
692 | code = afs_FlushVCache(tvc, &fv_slept); | |
693 | if (code) { | |
694 | /* Ok, so, if we got code != 0, uh, wtf do we do? */ | |
695 | /* Probably, build a temporary list and then put all back when we | |
696 | get to the end of the list */ | |
697 | /* This is actually really crappy, but we need to not leak these. | |
698 | We probably need a way to be smarter about this. */ | |
699 | tvc->nextfree = tmpReclaimedVCList; | |
700 | tmpReclaimedVCList = tvc; | |
701 | /* printf("Reclaim list flush %lx failed: %d\n", (unsigned long) tvc, code); */ | |
702 | } | |
703 | if (tvc->f.states & (CVInit | |
704 | #ifdef AFS_DARWIN80_ENV | |
705 | | CDeadVnode | |
706 | #endif | |
707 | )) { | |
708 | tvc->f.states &= ~(CVInit | |
709 | #ifdef AFS_DARWIN80_ENV | |
710 | | CDeadVnode | |
711 | #endif | |
712 | ); | |
713 | afs_osi_Wakeup(&tvc->f.states); | |
714 | } | |
715 | } | |
716 | if (tmpReclaimedVCList) | |
717 | ReclaimedVCList = tmpReclaimedVCList; | |
718 | ||
719 | ReleaseWriteLock(&afs_xvreclaim); | |
720 | #endif | |
721 | } | |
722 | ||
723 | void | |
724 | afs_PostPopulateVCache(struct vcache *avc, struct VenusFid *afid, int seq) | |
725 | { | |
726 | /* | |
727 | * The proper value for mvstat (for root fids) is setup by the caller. | |
728 | */ | |
729 | avc->mvstat = AFS_MVSTAT_FILE; | |
730 | if (afid->Fid.Vnode == 1 && afid->Fid.Unique == 1) | |
731 | avc->mvstat = AFS_MVSTAT_ROOT; | |
732 | ||
733 | if (afs_globalVFS == 0) | |
734 | osi_Panic("afs globalvfs"); | |
735 | ||
736 | osi_PostPopulateVCache(avc); | |
737 | ||
738 | avc->dchint = NULL; | |
739 | osi_dnlc_purgedp(avc); /* this may be overkill */ | |
740 | memset(&(avc->callsort), 0, sizeof(struct afs_q)); | |
741 | avc->slocks = NULL; | |
742 | avc->f.states &=~ CVInit; | |
743 | if (seq) { | |
744 | avc->f.states |= CBulkFetching; | |
745 | avc->f.m.Length = seq; | |
746 | } | |
747 | afs_osi_Wakeup(&avc->f.states); | |
748 | } | |
749 | ||
750 | int | |
751 | afs_ShakeLooseVCaches(afs_int32 anumber) | |
752 | { | |
753 | afs_int32 i, loop; | |
754 | int evicted; | |
755 | struct vcache *tvc; | |
756 | struct afs_q *tq, *uq; | |
757 | int fv_slept, defersleep = 0; | |
758 | int limit; | |
759 | afs_int32 target = anumber; | |
760 | ||
761 | loop = 0; | |
762 | ||
763 | retry: | |
764 | i = 0; | |
765 | limit = afs_vcount; | |
766 | for (tq = VLRU.prev; tq != &VLRU && anumber > 0; tq = uq) { | |
767 | tvc = QTOV(tq); | |
768 | uq = QPrev(tq); | |
769 | if (tvc->f.states & CVFlushed) { | |
770 | refpanic("CVFlushed on VLRU"); | |
771 | } else if (i++ > limit) { | |
772 | afs_warn("afs_ShakeLooseVCaches: i %d limit %d afs_vcount %d afs_maxvcount %d\n", | |
773 | (int)i, limit, (int)afs_vcount, (int)afs_maxvcount); | |
774 | refpanic("Found too many AFS vnodes on VLRU (VLRU cycle?)"); | |
775 | } else if (QNext(uq) != tq) { | |
776 | refpanic("VLRU inconsistent"); | |
777 | } else if (tvc->f.states & CVInit) { | |
778 | continue; | |
779 | } | |
780 | ||
781 | fv_slept = 0; | |
782 | evicted = osi_TryEvictVCache(tvc, &fv_slept, defersleep); | |
783 | if (evicted) { | |
784 | anumber--; | |
785 | } | |
786 | ||
787 | if (fv_slept) { | |
788 | if (loop++ > 100) | |
789 | break; | |
790 | if (!evicted) { | |
791 | /* | |
792 | * This vcache was busy and we slept while trying to evict it. | |
793 | * Move this busy vcache to the head of the VLRU so vcaches | |
794 | * following this busy vcache can be evicted during the retry. | |
795 | */ | |
796 | QRemove(&tvc->vlruq); | |
797 | QAdd(&VLRU, &tvc->vlruq); | |
798 | } | |
799 | goto retry; /* start over - may have raced. */ | |
800 | } | |
801 | if (uq == &VLRU) { | |
802 | if (anumber && !defersleep) { | |
803 | defersleep = 1; | |
804 | goto retry; | |
805 | } | |
806 | break; | |
807 | } | |
808 | } | |
809 | if (!afsd_dynamic_vcaches && anumber == target) { | |
810 | afs_warn("afs_ShakeLooseVCaches: warning none freed, using %d of %d\n", | |
811 | afs_vcount, afs_maxvcount); | |
812 | } | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | /* Alloc new vnode. */ | |
818 | ||
819 | static struct vcache * | |
820 | afs_AllocVCache(void) | |
821 | { | |
822 | struct vcache *tvc; | |
823 | ||
824 | tvc = osi_NewVnode(); | |
825 | ||
826 | afs_vcount++; | |
827 | ||
828 | /* track the peak */ | |
829 | if (afsd_dynamic_vcaches && afs_maxvcount < afs_vcount) { | |
830 | afs_maxvcount = afs_vcount; | |
831 | /*printf("peak vnodes: %d\n", afs_maxvcount);*/ | |
832 | } | |
833 | ||
834 | afs_stats_cmperf.vcacheXAllocs++; /* count in case we have a leak */ | |
835 | ||
836 | /* If we create a new inode, we either give it a new slot number, | |
837 | * or if one's available, use a slot number from the slot free list | |
838 | */ | |
839 | if (afs_freeSlotList != NULL) { | |
840 | struct afs_slotlist *tmp; | |
841 | ||
842 | tvc->diskSlot = afs_freeSlotList->slot; | |
843 | tmp = afs_freeSlotList; | |
844 | afs_freeSlotList = tmp->next; | |
845 | afs_osi_Free(tmp, sizeof(struct afs_slotlist)); | |
846 | } else { | |
847 | tvc->diskSlot = afs_nextVcacheSlot++; | |
848 | } | |
849 | ||
850 | return tvc; | |
851 | } | |
852 | ||
853 | /* Pre populate a newly allocated vcache. On platforms where the actual | |
854 | * vnode is attached to the vcache, this function is called before attachment, | |
855 | * therefore it cannot perform any actions on the vnode itself */ | |
856 | ||
857 | static void | |
858 | afs_PrePopulateVCache(struct vcache *avc, struct VenusFid *afid, | |
859 | struct server *serverp) { | |
860 | ||
861 | afs_uint32 slot; | |
862 | afs_hyper_t zero; | |
863 | slot = avc->diskSlot; | |
864 | ||
865 | osi_PrePopulateVCache(avc); | |
866 | ||
867 | avc->diskSlot = slot; | |
868 | QZero(&avc->metadirty); | |
869 | ||
870 | AFS_RWLOCK_INIT(&avc->lock, "vcache lock"); | |
871 | ||
872 | memset(&avc->mvid, 0, sizeof(avc->mvid)); | |
873 | avc->linkData = NULL; | |
874 | avc->cbExpires = 0; | |
875 | avc->opens = 0; | |
876 | avc->execsOrWriters = 0; | |
877 | avc->flockCount = 0; | |
878 | avc->f.states = CVInit; | |
879 | avc->last_looker = 0; | |
880 | avc->f.fid = *afid; | |
881 | avc->asynchrony = -1; | |
882 | avc->vc_error = 0; | |
883 | ||
884 | hzero(avc->mapDV); | |
885 | avc->f.truncPos = AFS_NOTRUNC; /* don't truncate until we need to */ | |
886 | hzero(zero); | |
887 | afs_SetDataVersion(avc, &zero); /* in case we copy it into flushDV */ | |
888 | avc->Access = NULL; | |
889 | avc->callback = serverp; /* to minimize chance that clear | |
890 | * request is lost */ | |
891 | ||
892 | #if defined(AFS_CACHE_BYPASS) | |
893 | avc->cachingStates = 0; | |
894 | avc->cachingTransitions = 0; | |
895 | #endif | |
896 | } | |
897 | ||
898 | void | |
899 | afs_FlushAllVCaches(void) | |
900 | { | |
901 | int i; | |
902 | struct vcache *tvc, *nvc; | |
903 | ||
904 | ObtainWriteLock(&afs_xvcache, 867); | |
905 | ||
906 | retry: | |
907 | for (i = 0; i < VCSIZE; i++) { | |
908 | for (tvc = afs_vhashT[i]; tvc; tvc = nvc) { | |
909 | int slept; | |
910 | ||
911 | nvc = tvc->hnext; | |
912 | if (afs_FlushVCache(tvc, &slept)) { | |
913 | afs_warn("Failed to flush vcache 0x%lx\n", (unsigned long)(uintptrsz)tvc); | |
914 | } | |
915 | if (slept) { | |
916 | goto retry; | |
917 | } | |
918 | } | |
919 | } | |
920 | ||
921 | ReleaseWriteLock(&afs_xvcache); | |
922 | } | |
923 | ||
924 | /*! | |
925 | * This routine is responsible for allocating a new cache entry | |
926 | * from the free list. It formats the cache entry and inserts it | |
927 | * into the appropriate hash tables. It must be called with | |
928 | * afs_xvcache write-locked so as to prevent several processes from | |
929 | * trying to create a new cache entry simultaneously. | |
930 | * | |
931 | * LOCK: afs_NewVCache afs_xvcache W | |
932 | * | |
933 | * \param afid The file id of the file whose cache entry is being created. | |
934 | * | |
935 | * \return The new vcache struct. | |
936 | */ | |
937 | ||
938 | static_inline struct vcache * | |
939 | afs_NewVCache_int(struct VenusFid *afid, struct server *serverp, int seq) | |
940 | { | |
941 | struct vcache *tvc; | |
942 | afs_int32 i, j; | |
943 | afs_int32 anumber = VCACHE_FREE; | |
944 | ||
945 | AFS_STATCNT(afs_NewVCache); | |
946 | ||
947 | afs_FlushReclaimedVcaches(); | |
948 | ||
949 | #if defined(AFS_LINUX22_ENV) | |
950 | if(!afsd_dynamic_vcaches && afs_vcount >= afs_maxvcount) { | |
951 | afs_ShakeLooseVCaches(anumber); | |
952 | if (afs_vcount >= afs_maxvcount) { | |
953 | afs_warn("afs_NewVCache - none freed\n"); | |
954 | return NULL; | |
955 | } | |
956 | } | |
957 | tvc = afs_AllocVCache(); | |
958 | #else /* AFS_LINUX22_ENV */ | |
959 | /* pull out a free cache entry */ | |
960 | if (!freeVCList) { | |
961 | afs_ShakeLooseVCaches(anumber); | |
962 | } | |
963 | ||
964 | if (!freeVCList) { | |
965 | tvc = afs_AllocVCache(); | |
966 | } else { | |
967 | tvc = freeVCList; /* take from free list */ | |
968 | freeVCList = tvc->nextfree; | |
969 | tvc->nextfree = NULL; | |
970 | afs_vcount++; /* balanced by FlushVCache */ | |
971 | } /* end of if (!freeVCList) */ | |
972 | ||
973 | #endif /* AFS_LINUX22_ENV */ | |
974 | ||
975 | #if defined(AFS_XBSD_ENV) || defined(AFS_DARWIN_ENV) | |
976 | if (tvc->v) | |
977 | panic("afs_NewVCache(): free vcache with vnode attached"); | |
978 | #endif | |
979 | ||
980 | /* Populate the vcache with as much as we can. */ | |
981 | afs_PrePopulateVCache(tvc, afid, serverp); | |
982 | ||
983 | /* Thread the vcache onto the VLRU */ | |
984 | ||
985 | i = VCHash(afid); | |
986 | j = VCHashV(afid); | |
987 | ||
988 | tvc->hnext = afs_vhashT[i]; | |
989 | afs_vhashT[i] = tvc; | |
990 | QAdd(&afs_vhashTV[j], &tvc->vhashq); | |
991 | ||
992 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
993 | refpanic("NewVCache VLRU inconsistent"); | |
994 | } | |
995 | QAdd(&VLRU, &tvc->vlruq); /* put in lruq */ | |
996 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
997 | refpanic("NewVCache VLRU inconsistent2"); | |
998 | } | |
999 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
1000 | refpanic("NewVCache VLRU inconsistent3"); | |
1001 | } | |
1002 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
1003 | refpanic("NewVCache VLRU inconsistent4"); | |
1004 | } | |
1005 | vcachegen++; | |
1006 | ||
1007 | /* it should now be safe to drop the xvcache lock - so attach an inode | |
1008 | * to this vcache, where necessary */ | |
1009 | osi_AttachVnode(tvc, seq); | |
1010 | ||
1011 | /* Get a reference count to hold this vcache for the VLRUQ. Note that | |
1012 | * we have to do this after attaching the vnode, because the reference | |
1013 | * count may be held in the vnode itself */ | |
1014 | ||
1015 | #if defined(AFS_LINUX22_ENV) | |
1016 | /* Hold it for the LRU (should make count 2) */ | |
1017 | AFS_FAST_HOLD(tvc); | |
1018 | #elif !(defined (AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)) | |
1019 | VREFCOUNT_SET(tvc, 1); /* us */ | |
1020 | #endif | |
1021 | ||
1022 | #if defined (AFS_FBSD_ENV) | |
1023 | if (tvc->f.states & CVInit) | |
1024 | #endif | |
1025 | afs_PostPopulateVCache(tvc, afid, seq); | |
1026 | ||
1027 | return tvc; | |
1028 | } /*afs_NewVCache */ | |
1029 | ||
1030 | ||
1031 | struct vcache * | |
1032 | afs_NewVCache(struct VenusFid *afid, struct server *serverp) | |
1033 | { | |
1034 | return afs_NewVCache_int(afid, serverp, 0); | |
1035 | } | |
1036 | ||
1037 | struct vcache * | |
1038 | afs_NewBulkVCache(struct VenusFid *afid, struct server *serverp, int seq) | |
1039 | { | |
1040 | return afs_NewVCache_int(afid, serverp, seq); | |
1041 | } | |
1042 | ||
1043 | /*! | |
1044 | * ??? | |
1045 | * | |
1046 | * LOCK: afs_FlushActiveVcaches afs_xvcache N | |
1047 | * | |
1048 | * \param doflocks : Do we handle flocks? | |
1049 | */ | |
1050 | void | |
1051 | afs_FlushActiveVcaches(afs_int32 doflocks) | |
1052 | { | |
1053 | struct vcache *tvc; | |
1054 | int i; | |
1055 | struct afs_conn *tc; | |
1056 | afs_int32 code; | |
1057 | afs_ucred_t *cred = NULL; | |
1058 | struct vrequest *treq = NULL; | |
1059 | struct AFSVolSync tsync; | |
1060 | int didCore; | |
1061 | XSTATS_DECLS; | |
1062 | AFS_STATCNT(afs_FlushActiveVcaches); | |
1063 | ||
1064 | code = afs_CreateReq(&treq, afs_osi_credp); | |
1065 | if (code) { | |
1066 | afs_warn("unable to alloc treq\n"); | |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | ObtainReadLock(&afs_xvcache); | |
1071 | for (i = 0; i < VCSIZE; i++) { | |
1072 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
1073 | if (tvc->f.states & CVInit) continue; | |
1074 | #ifdef AFS_DARWIN80_ENV | |
1075 | if (tvc->f.states & CDeadVnode && | |
1076 | (tvc->f.states & (CCore|CUnlinkedDel) || | |
1077 | tvc->flockCount)) panic("Dead vnode has core/unlinkedel/flock"); | |
1078 | #endif | |
1079 | if (doflocks && tvc->flockCount != 0) { | |
1080 | struct rx_connection *rxconn; | |
1081 | /* if this entry has an flock, send a keep-alive call out */ | |
1082 | osi_vnhold(tvc, 0); | |
1083 | ReleaseReadLock(&afs_xvcache); | |
1084 | ObtainWriteLock(&tvc->lock, 51); | |
1085 | do { | |
1086 | code = afs_InitReq(treq, afs_osi_credp); | |
1087 | if (code) { | |
1088 | code = -1; | |
1089 | break; /* shutting down: do not try to extend the lock */ | |
1090 | } | |
1091 | treq->flags |= O_NONBLOCK; | |
1092 | ||
1093 | tc = afs_Conn(&tvc->f.fid, treq, SHARED_LOCK, &rxconn); | |
1094 | if (tc) { | |
1095 | XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_EXTENDLOCK); | |
1096 | RX_AFS_GUNLOCK(); | |
1097 | code = | |
1098 | RXAFS_ExtendLock(rxconn, | |
1099 | (struct AFSFid *)&tvc->f.fid.Fid, | |
1100 | &tsync); | |
1101 | RX_AFS_GLOCK(); | |
1102 | XSTATS_END_TIME; | |
1103 | } else | |
1104 | code = -1; | |
1105 | } while (afs_Analyze | |
1106 | (tc, rxconn, code, &tvc->f.fid, treq, | |
1107 | AFS_STATS_FS_RPCIDX_EXTENDLOCK, SHARED_LOCK, NULL)); | |
1108 | ||
1109 | ReleaseWriteLock(&tvc->lock); | |
1110 | #ifdef AFS_DARWIN80_ENV | |
1111 | AFS_FAST_RELE(tvc); | |
1112 | ObtainReadLock(&afs_xvcache); | |
1113 | #else | |
1114 | ObtainReadLock(&afs_xvcache); | |
1115 | AFS_FAST_RELE(tvc); | |
1116 | #endif | |
1117 | } | |
1118 | didCore = 0; | |
1119 | if ((tvc->f.states & CCore) || (tvc->f.states & CUnlinkedDel)) { | |
1120 | /* | |
1121 | * Don't let it evaporate in case someone else is in | |
1122 | * this code. Also, drop the afs_xvcache lock while | |
1123 | * getting vcache locks. | |
1124 | */ | |
1125 | osi_vnhold(tvc, 0); | |
1126 | ReleaseReadLock(&afs_xvcache); | |
1127 | #if defined(AFS_SGI_ENV) | |
1128 | /* | |
1129 | * That's because if we come in via the CUnlinkedDel bit state path we'll be have 0 refcnt | |
1130 | */ | |
1131 | osi_Assert(VREFCOUNT_GT(tvc,0)); | |
1132 | AFS_RWLOCK((vnode_t *) tvc, VRWLOCK_WRITE); | |
1133 | #endif | |
1134 | ObtainWriteLock(&tvc->lock, 52); | |
1135 | if (tvc->f.states & CCore) { | |
1136 | tvc->f.states &= ~CCore; | |
1137 | /* XXXX Find better place-holder for cred XXXX */ | |
1138 | cred = (afs_ucred_t *)tvc->linkData; | |
1139 | tvc->linkData = NULL; /* XXX */ | |
1140 | code = afs_InitReq(treq, cred); | |
1141 | afs_Trace2(afs_iclSetp, CM_TRACE_ACTCCORE, | |
1142 | ICL_TYPE_POINTER, tvc, ICL_TYPE_INT32, | |
1143 | tvc->execsOrWriters); | |
1144 | if (!code) { /* avoid store when shutting down */ | |
1145 | code = afs_StoreOnLastReference(tvc, treq); | |
1146 | } | |
1147 | ReleaseWriteLock(&tvc->lock); | |
1148 | hzero(tvc->flushDV); | |
1149 | osi_FlushText(tvc); | |
1150 | didCore = 1; | |
1151 | if (code && code != VNOVNODE) { | |
1152 | afs_StoreWarn(code, tvc->f.fid.Fid.Volume, | |
1153 | /* /dev/console */ 1); | |
1154 | } | |
1155 | } else if (tvc->f.states & CUnlinkedDel) { | |
1156 | /* | |
1157 | * Ignore errors | |
1158 | */ | |
1159 | ReleaseWriteLock(&tvc->lock); | |
1160 | #if defined(AFS_SGI_ENV) | |
1161 | AFS_RWUNLOCK((vnode_t *) tvc, VRWLOCK_WRITE); | |
1162 | #endif | |
1163 | afs_remunlink(tvc, 0); | |
1164 | #if defined(AFS_SGI_ENV) | |
1165 | AFS_RWLOCK((vnode_t *) tvc, VRWLOCK_WRITE); | |
1166 | #endif | |
1167 | } else { | |
1168 | /* lost (or won, perhaps) the race condition */ | |
1169 | ReleaseWriteLock(&tvc->lock); | |
1170 | } | |
1171 | #if defined(AFS_SGI_ENV) | |
1172 | AFS_RWUNLOCK((vnode_t *) tvc, VRWLOCK_WRITE); | |
1173 | #endif | |
1174 | #ifdef AFS_DARWIN80_ENV | |
1175 | AFS_FAST_RELE(tvc); | |
1176 | if (didCore) { | |
1177 | AFS_RELE(AFSTOV(tvc)); | |
1178 | /* Matches write code setting CCore flag */ | |
1179 | crfree(cred); | |
1180 | } | |
1181 | ObtainReadLock(&afs_xvcache); | |
1182 | #else | |
1183 | ObtainReadLock(&afs_xvcache); | |
1184 | AFS_FAST_RELE(tvc); | |
1185 | if (didCore) { | |
1186 | AFS_RELE(AFSTOV(tvc)); | |
1187 | /* Matches write code setting CCore flag */ | |
1188 | crfree(cred); | |
1189 | } | |
1190 | #endif | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | ReleaseReadLock(&afs_xvcache); | |
1195 | afs_DestroyReq(treq); | |
1196 | } | |
1197 | ||
1198 | ||
1199 | ||
1200 | /*! | |
1201 | * Make sure a cache entry is up-to-date status-wise. | |
1202 | * | |
1203 | * NOTE: everywhere that calls this can potentially be sped up | |
1204 | * by checking CStatd first, and avoiding doing the InitReq | |
1205 | * if this is up-to-date. | |
1206 | * | |
1207 | * Anymore, the only places that call this KNOW already that the | |
1208 | * vcache is not up-to-date, so we don't screw around. | |
1209 | * | |
1210 | * \param avc : Ptr to vcache entry to verify. | |
1211 | * \param areq : ??? | |
1212 | */ | |
1213 | ||
1214 | /*! | |
1215 | * | |
1216 | * Make sure a cache entry is up-to-date status-wise. | |
1217 | * | |
1218 | * NOTE: everywhere that calls this can potentially be sped up | |
1219 | * by checking CStatd first, and avoiding doing the InitReq | |
1220 | * if this is up-to-date. | |
1221 | * | |
1222 | * Anymore, the only places that call this KNOW already that the | |
1223 | * vcache is not up-to-date, so we don't screw around. | |
1224 | * | |
1225 | * \param avc Pointer to vcache entry to verify. | |
1226 | * \param areq | |
1227 | * | |
1228 | * \return 0 for success or other error codes. | |
1229 | */ | |
1230 | int | |
1231 | afs_VerifyVCache2(struct vcache *avc, struct vrequest *areq) | |
1232 | { | |
1233 | struct vcache *tvc; | |
1234 | ||
1235 | AFS_STATCNT(afs_VerifyVCache); | |
1236 | ||
1237 | /* otherwise we must fetch the status info */ | |
1238 | ||
1239 | ObtainWriteLock(&avc->lock, 53); | |
1240 | if (avc->f.states & CStatd) { | |
1241 | ReleaseWriteLock(&avc->lock); | |
1242 | return 0; | |
1243 | } | |
1244 | afs_StaleVCacheFlags(avc, AFS_STALEVC_FILENAME | AFS_STALEVC_CLEARCB, | |
1245 | CUnique); | |
1246 | ReleaseWriteLock(&avc->lock); | |
1247 | ||
1248 | /* fetch the status info */ | |
1249 | tvc = afs_GetVCache(&avc->f.fid, areq, NULL, avc); | |
1250 | if (!tvc) | |
1251 | return EIO; | |
1252 | /* Put it back; caller has already incremented vrefCount */ | |
1253 | afs_PutVCache(tvc); | |
1254 | return 0; | |
1255 | ||
1256 | } /*afs_VerifyVCache */ | |
1257 | ||
1258 | ||
1259 | /*! | |
1260 | * Simple copy of stat info into cache. | |
1261 | * | |
1262 | * Callers:as of 1992-04-29, only called by WriteVCache | |
1263 | * | |
1264 | * \param avc Ptr to vcache entry involved. | |
1265 | * \param astat Ptr to stat info to copy. | |
1266 | * | |
1267 | */ | |
1268 | static void | |
1269 | afs_SimpleVStat(struct vcache *avc, | |
1270 | struct AFSFetchStatus *astat, struct vrequest *areq) | |
1271 | { | |
1272 | afs_size_t length; | |
1273 | AFS_STATCNT(afs_SimpleVStat); | |
1274 | ||
1275 | #ifdef AFS_64BIT_CLIENT | |
1276 | FillInt64(length, astat->Length_hi, astat->Length); | |
1277 | #else /* AFS_64BIT_CLIENT */ | |
1278 | length = astat->Length; | |
1279 | #endif /* AFS_64BIT_CLIENT */ | |
1280 | ||
1281 | #if defined(AFS_SGI_ENV) | |
1282 | if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc) | |
1283 | && !AFS_VN_MAPPED((vnode_t *) avc)) { | |
1284 | osi_Assert((valusema(&avc->vc_rwlock) <= 0) | |
1285 | && (OSI_GET_LOCKID() == avc->vc_rwlockid)); | |
1286 | if (length < avc->f.m.Length) { | |
1287 | vnode_t *vp = (vnode_t *) avc; | |
1288 | ||
1289 | osi_Assert(WriteLocked(&avc->lock)); | |
1290 | ReleaseWriteLock(&avc->lock); | |
1291 | AFS_GUNLOCK(); | |
1292 | PTOSSVP(vp, (off_t) length, (off_t) MAXLONG); | |
1293 | AFS_GLOCK(); | |
1294 | ObtainWriteLock(&avc->lock, 67); | |
1295 | } | |
1296 | } | |
1297 | #endif | |
1298 | ||
1299 | if (!afs_DirtyPages(avc)) { | |
1300 | /* if actively writing the file, don't fetch over this value */ | |
1301 | afs_Trace3(afs_iclSetp, CM_TRACE_SIMPLEVSTAT, ICL_TYPE_POINTER, avc, | |
1302 | ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length), | |
1303 | ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length)); | |
1304 | avc->f.m.Length = length; | |
1305 | avc->f.m.Date = astat->ClientModTime; | |
1306 | } | |
1307 | avc->f.m.Owner = astat->Owner; | |
1308 | avc->f.m.Group = astat->Group; | |
1309 | avc->f.m.Mode = astat->UnixModeBits; | |
1310 | if (vType(avc) == VREG) { | |
1311 | avc->f.m.Mode |= S_IFREG; | |
1312 | } else if (vType(avc) == VDIR) { | |
1313 | avc->f.m.Mode |= S_IFDIR; | |
1314 | } else if (vType(avc) == VLNK) { | |
1315 | avc->f.m.Mode |= S_IFLNK; | |
1316 | if ((avc->f.m.Mode & 0111) == 0) | |
1317 | avc->mvstat = AFS_MVSTAT_MTPT; | |
1318 | } | |
1319 | if (avc->f.states & CForeign) { | |
1320 | struct axscache *ac; | |
1321 | avc->f.anyAccess = astat->AnonymousAccess; | |
1322 | #ifdef badidea | |
1323 | if ((astat->CallerAccess & ~astat->AnonymousAccess)) | |
1324 | /* USED TO SAY : | |
1325 | * Caller has at least one bit not covered by anonymous, and | |
1326 | * thus may have interesting rights. | |
1327 | * | |
1328 | * HOWEVER, this is a really bad idea, because any access query | |
1329 | * for bits which aren't covered by anonymous, on behalf of a user | |
1330 | * who doesn't have any special rights, will result in an answer of | |
1331 | * the form "I don't know, lets make a FetchStatus RPC and find out!" | |
1332 | * It's an especially bad idea under Ultrix, since (due to the lack of | |
1333 | * a proper access() call) it must perform several afs_access() calls | |
1334 | * in order to create magic mode bits that vary according to who makes | |
1335 | * the call. In other words, _every_ stat() generates a test for | |
1336 | * writeability... | |
1337 | */ | |
1338 | #endif /* badidea */ | |
1339 | if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid))) | |
1340 | ac->axess = astat->CallerAccess; | |
1341 | else /* not found, add a new one if possible */ | |
1342 | afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess); | |
1343 | } | |
1344 | ||
1345 | } /*afs_SimpleVStat */ | |
1346 | ||
1347 | ||
1348 | /*! | |
1349 | * Store the status info *only* back to the server for a | |
1350 | * fid/vrequest. | |
1351 | * | |
1352 | * Environment: Must be called with a shared lock held on the vnode. | |
1353 | * | |
1354 | * \param avc Ptr to the vcache entry. | |
1355 | * \param astatus Ptr to the status info to store. | |
1356 | * \param areq Ptr to the associated vrequest. | |
1357 | * | |
1358 | * \return Operation status. | |
1359 | */ | |
1360 | ||
1361 | int | |
1362 | afs_WriteVCache(struct vcache *avc, | |
1363 | struct AFSStoreStatus *astatus, | |
1364 | struct vrequest *areq) | |
1365 | { | |
1366 | afs_int32 code; | |
1367 | struct afs_conn *tc; | |
1368 | struct AFSFetchStatus OutStatus; | |
1369 | struct AFSVolSync tsync; | |
1370 | struct rx_connection *rxconn; | |
1371 | XSTATS_DECLS; | |
1372 | AFS_STATCNT(afs_WriteVCache); | |
1373 | afs_Trace2(afs_iclSetp, CM_TRACE_WVCACHE, ICL_TYPE_POINTER, avc, | |
1374 | ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length)); | |
1375 | do { | |
1376 | tc = afs_Conn(&avc->f.fid, areq, SHARED_LOCK, &rxconn); | |
1377 | if (tc) { | |
1378 | XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_STORESTATUS); | |
1379 | RX_AFS_GUNLOCK(); | |
1380 | code = | |
1381 | RXAFS_StoreStatus(rxconn, (struct AFSFid *)&avc->f.fid.Fid, | |
1382 | astatus, &OutStatus, &tsync); | |
1383 | RX_AFS_GLOCK(); | |
1384 | XSTATS_END_TIME; | |
1385 | } else | |
1386 | code = -1; | |
1387 | } while (afs_Analyze | |
1388 | (tc, rxconn, code, &avc->f.fid, areq, AFS_STATS_FS_RPCIDX_STORESTATUS, | |
1389 | SHARED_LOCK, NULL)); | |
1390 | ||
1391 | UpgradeSToWLock(&avc->lock, 20); | |
1392 | if (code == 0) { | |
1393 | /* success, do the changes locally */ | |
1394 | afs_SimpleVStat(avc, &OutStatus, areq); | |
1395 | /* | |
1396 | * Update the date, too. SimpleVStat didn't do this, since | |
1397 | * it thought we were doing this after fetching new status | |
1398 | * over a file being written. | |
1399 | */ | |
1400 | avc->f.m.Date = OutStatus.ClientModTime; | |
1401 | } else { | |
1402 | /* failure, set up to check with server next time */ | |
1403 | afs_StaleVCacheFlags(avc, 0, CUnique); | |
1404 | } | |
1405 | ConvertWToSLock(&avc->lock); | |
1406 | return code; | |
1407 | ||
1408 | } /*afs_WriteVCache */ | |
1409 | ||
1410 | /*! | |
1411 | * Store status info only locally, set the proper disconnection flags | |
1412 | * and add to dirty list. | |
1413 | * | |
1414 | * \param avc The vcache to be written locally. | |
1415 | * \param astatus Get attr fields from local store. | |
1416 | * \param attrs This one is only of the vs_size. | |
1417 | * | |
1418 | * \note Must be called with a shared lock on the vnode | |
1419 | */ | |
1420 | int | |
1421 | afs_WriteVCacheDiscon(struct vcache *avc, | |
1422 | struct AFSStoreStatus *astatus, | |
1423 | struct vattr *attrs) | |
1424 | { | |
1425 | afs_int32 code = 0; | |
1426 | afs_int32 flags = 0; | |
1427 | ||
1428 | UpgradeSToWLock(&avc->lock, 700); | |
1429 | ||
1430 | if (!astatus->Mask) { | |
1431 | ||
1432 | return code; | |
1433 | ||
1434 | } else { | |
1435 | ||
1436 | /* Set attributes. */ | |
1437 | if (astatus->Mask & AFS_SETMODTIME) { | |
1438 | avc->f.m.Date = astatus->ClientModTime; | |
1439 | flags |= VDisconSetTime; | |
1440 | } | |
1441 | ||
1442 | if (astatus->Mask & AFS_SETOWNER) { | |
1443 | /* printf("Not allowed yet. \n"); */ | |
1444 | /*avc->f.m.Owner = astatus->Owner;*/ | |
1445 | } | |
1446 | ||
1447 | if (astatus->Mask & AFS_SETGROUP) { | |
1448 | /* printf("Not allowed yet. \n"); */ | |
1449 | /*avc->f.m.Group = astatus->Group;*/ | |
1450 | } | |
1451 | ||
1452 | if (astatus->Mask & AFS_SETMODE) { | |
1453 | avc->f.m.Mode = astatus->UnixModeBits; | |
1454 | ||
1455 | #if 0 /* XXX: Leaving this out, so it doesn't mess up the file type flag.*/ | |
1456 | ||
1457 | if (vType(avc) == VREG) { | |
1458 | avc->f.m.Mode |= S_IFREG; | |
1459 | } else if (vType(avc) == VDIR) { | |
1460 | avc->f.m.Mode |= S_IFDIR; | |
1461 | } else if (vType(avc) == VLNK) { | |
1462 | avc->f.m.Mode |= S_IFLNK; | |
1463 | if ((avc->f.m.Mode & 0111) == 0) | |
1464 | avc->mvstat = AFS_MVSTAT_MTPT; | |
1465 | } | |
1466 | #endif | |
1467 | flags |= VDisconSetMode; | |
1468 | } /* if(astatus.Mask & AFS_SETMODE) */ | |
1469 | ||
1470 | } /* if (!astatus->Mask) */ | |
1471 | ||
1472 | if (attrs->va_size > 0) { | |
1473 | /* XXX: Do I need more checks? */ | |
1474 | /* Truncation operation. */ | |
1475 | flags |= VDisconTrunc; | |
1476 | } | |
1477 | ||
1478 | if (flags) | |
1479 | afs_DisconAddDirty(avc, flags, 1); | |
1480 | ||
1481 | /* XXX: How about the rest of the fields? */ | |
1482 | ||
1483 | ConvertWToSLock(&avc->lock); | |
1484 | ||
1485 | return code; | |
1486 | } | |
1487 | ||
1488 | /*! | |
1489 | * Copy astat block into vcache info | |
1490 | * | |
1491 | * \note This code may get dataversion and length out of sync if the file has | |
1492 | * been modified. This is less than ideal. I haven't thought about it sufficiently | |
1493 | * to be certain that it is adequate. | |
1494 | * | |
1495 | * \note Environment: Must be called under a write lock | |
1496 | * | |
1497 | * \param avc Ptr to vcache entry. | |
1498 | * \param astat Ptr to stat block to copy in. | |
1499 | * \param areq Ptr to associated request. | |
1500 | */ | |
1501 | void | |
1502 | afs_ProcessFS(struct vcache *avc, | |
1503 | struct AFSFetchStatus *astat, struct vrequest *areq) | |
1504 | { | |
1505 | afs_size_t length; | |
1506 | afs_hyper_t newDV; | |
1507 | AFS_STATCNT(afs_ProcessFS); | |
1508 | ||
1509 | #ifdef AFS_64BIT_CLIENT | |
1510 | FillInt64(length, astat->Length_hi, astat->Length); | |
1511 | #else /* AFS_64BIT_CLIENT */ | |
1512 | length = astat->Length; | |
1513 | #endif /* AFS_64BIT_CLIENT */ | |
1514 | /* WARNING: afs_DoBulkStat uses the Length field to store a sequence | |
1515 | * number for each bulk status request. Under no circumstances | |
1516 | * should afs_DoBulkStat store a sequence number if the new | |
1517 | * length will be ignored when afs_ProcessFS is called with | |
1518 | * new stats. If you change the following conditional then you | |
1519 | * also need to change the conditional in afs_DoBulkStat. */ | |
1520 | #ifdef AFS_SGI_ENV | |
1521 | if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc) | |
1522 | && !AFS_VN_MAPPED((vnode_t *) avc)) { | |
1523 | #else | |
1524 | if ((avc->execsOrWriters <= 0) && !afs_DirtyPages(avc)) { | |
1525 | #endif | |
1526 | /* if we're writing or mapping this file, don't fetch over these | |
1527 | * values. | |
1528 | */ | |
1529 | afs_Trace3(afs_iclSetp, CM_TRACE_PROCESSFS, ICL_TYPE_POINTER, avc, | |
1530 | ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length), | |
1531 | ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(length)); | |
1532 | avc->f.m.Length = length; | |
1533 | avc->f.m.Date = astat->ClientModTime; | |
1534 | } | |
1535 | hset64(newDV, astat->dataVersionHigh, astat->DataVersion); | |
1536 | afs_SetDataVersion(avc, &newDV); | |
1537 | avc->f.m.Owner = astat->Owner; | |
1538 | avc->f.m.Mode = astat->UnixModeBits; | |
1539 | avc->f.m.Group = astat->Group; | |
1540 | avc->f.m.LinkCount = astat->LinkCount; | |
1541 | if (astat->FileType == File) { | |
1542 | vSetType(avc, VREG); | |
1543 | avc->f.m.Mode |= S_IFREG; | |
1544 | } else if (astat->FileType == Directory) { | |
1545 | vSetType(avc, VDIR); | |
1546 | avc->f.m.Mode |= S_IFDIR; | |
1547 | } else if (astat->FileType == SymbolicLink) { | |
1548 | if (afs_fakestat_enable && (avc->f.m.Mode & 0111) == 0) { | |
1549 | vSetType(avc, VDIR); | |
1550 | avc->f.m.Mode |= S_IFDIR; | |
1551 | } else { | |
1552 | vSetType(avc, VLNK); | |
1553 | avc->f.m.Mode |= S_IFLNK; | |
1554 | } | |
1555 | if ((avc->f.m.Mode & 0111) == 0) { | |
1556 | avc->mvstat = AFS_MVSTAT_MTPT; | |
1557 | } | |
1558 | } | |
1559 | avc->f.anyAccess = astat->AnonymousAccess; | |
1560 | #ifdef badidea | |
1561 | if ((astat->CallerAccess & ~astat->AnonymousAccess)) | |
1562 | /* USED TO SAY : | |
1563 | * Caller has at least one bit not covered by anonymous, and | |
1564 | * thus may have interesting rights. | |
1565 | * | |
1566 | * HOWEVER, this is a really bad idea, because any access query | |
1567 | * for bits which aren't covered by anonymous, on behalf of a user | |
1568 | * who doesn't have any special rights, will result in an answer of | |
1569 | * the form "I don't know, lets make a FetchStatus RPC and find out!" | |
1570 | * It's an especially bad idea under Ultrix, since (due to the lack of | |
1571 | * a proper access() call) it must perform several afs_access() calls | |
1572 | * in order to create magic mode bits that vary according to who makes | |
1573 | * the call. In other words, _every_ stat() generates a test for | |
1574 | * writeability... | |
1575 | */ | |
1576 | #endif /* badidea */ | |
1577 | { | |
1578 | struct axscache *ac; | |
1579 | if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid))) | |
1580 | ac->axess = astat->CallerAccess; | |
1581 | else /* not found, add a new one if possible */ | |
1582 | afs_AddAxs(avc->Access, areq->uid, astat->CallerAccess); | |
1583 | } | |
1584 | } /*afs_ProcessFS */ | |
1585 | ||
1586 | ||
1587 | /*! | |
1588 | * Get fid from server. | |
1589 | * | |
1590 | * \param afid | |
1591 | * \param areq Request to be passed on. | |
1592 | * \param name Name of ?? to lookup. | |
1593 | * \param OutStatus Fetch status. | |
1594 | * \param CallBackp | |
1595 | * \param serverp | |
1596 | * \param tsyncp | |
1597 | * | |
1598 | * \return Success status of operation. | |
1599 | */ | |
1600 | int | |
1601 | afs_RemoteLookup(struct VenusFid *afid, struct vrequest *areq, | |
1602 | char *name, struct VenusFid *nfid, | |
1603 | struct AFSFetchStatus *OutStatusp, | |
1604 | struct AFSCallBack *CallBackp, struct server **serverp, | |
1605 | struct AFSVolSync *tsyncp) | |
1606 | { | |
1607 | afs_int32 code; | |
1608 | struct afs_conn *tc; | |
1609 | struct rx_connection *rxconn; | |
1610 | struct AFSFetchStatus OutDirStatus; | |
1611 | XSTATS_DECLS; | |
1612 | if (!name) | |
1613 | name = ""; /* XXX */ | |
1614 | do { | |
1615 | tc = afs_Conn(afid, areq, SHARED_LOCK, &rxconn); | |
1616 | if (tc) { | |
1617 | if (serverp) | |
1618 | *serverp = tc->parent->srvr->server; | |
1619 | XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_XLOOKUP); | |
1620 | RX_AFS_GUNLOCK(); | |
1621 | code = | |
1622 | RXAFS_Lookup(rxconn, (struct AFSFid *)&afid->Fid, name, | |
1623 | (struct AFSFid *)&nfid->Fid, OutStatusp, | |
1624 | &OutDirStatus, CallBackp, tsyncp); | |
1625 | RX_AFS_GLOCK(); | |
1626 | XSTATS_END_TIME; | |
1627 | } else | |
1628 | code = -1; | |
1629 | } while (afs_Analyze | |
1630 | (tc, rxconn, code, afid, areq, AFS_STATS_FS_RPCIDX_XLOOKUP, SHARED_LOCK, | |
1631 | NULL)); | |
1632 | ||
1633 | return code; | |
1634 | } | |
1635 | ||
1636 | ||
1637 | /*! | |
1638 | * afs_GetVCache | |
1639 | * | |
1640 | * Given a file id and a vrequest structure, fetch the status | |
1641 | * information associated with the file. | |
1642 | * | |
1643 | * \param afid File ID. | |
1644 | * \param areq Ptr to associated vrequest structure, specifying the | |
1645 | * user whose authentication tokens will be used. | |
1646 | * \param avc Caller may already have a vcache for this file, which is | |
1647 | * already held. | |
1648 | * | |
1649 | * \note Environment: | |
1650 | * The cache entry is returned with an increased vrefCount field. | |
1651 | * The entry must be discarded by calling afs_PutVCache when you | |
1652 | * are through using the pointer to the cache entry. | |
1653 | * | |
1654 | * You should not hold any locks when calling this function, except | |
1655 | * locks on other vcache entries. If you lock more than one vcache | |
1656 | * entry simultaneously, you should lock them in this order: | |
1657 | * | |
1658 | * 1. Lock all files first, then directories. | |
1659 | * 2. Within a particular type, lock entries in Fid.Vnode order. | |
1660 | * | |
1661 | * This locking hierarchy is convenient because it allows locking | |
1662 | * of a parent dir cache entry, given a file (to check its access | |
1663 | * control list). It also allows renames to be handled easily by | |
1664 | * locking directories in a constant order. | |
1665 | * | |
1666 | * \note NB. NewVCache -> FlushVCache presently (4/10/95) drops the xvcache lock. | |
1667 | * | |
1668 | * \note Might have a vcache structure already, which must | |
1669 | * already be held by the caller | |
1670 | */ | |
1671 | struct vcache * | |
1672 | afs_GetVCache(struct VenusFid *afid, struct vrequest *areq, | |
1673 | afs_int32 * cached, struct vcache *avc) | |
1674 | { | |
1675 | ||
1676 | afs_int32 code, newvcache = 0; | |
1677 | struct vcache *tvc; | |
1678 | struct volume *tvp; | |
1679 | afs_int32 retry; | |
1680 | ||
1681 | AFS_STATCNT(afs_GetVCache); | |
1682 | ||
1683 | if (cached) | |
1684 | *cached = 0; /* Init just in case */ | |
1685 | ||
1686 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
1687 | loop: | |
1688 | #endif | |
1689 | ||
1690 | ObtainSharedLock(&afs_xvcache, 5); | |
1691 | ||
1692 | tvc = afs_FindVCache(afid, &retry, DO_STATS | DO_VLRU | IS_SLOCK); | |
1693 | if (tvc && retry) { | |
1694 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
1695 | ReleaseSharedLock(&afs_xvcache); | |
1696 | spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD); | |
1697 | goto loop; | |
1698 | #endif | |
1699 | } | |
1700 | if (tvc) { | |
1701 | if (cached) | |
1702 | *cached = 1; | |
1703 | osi_Assert((tvc->f.states & CVInit) == 0); | |
1704 | /* If we are in readdir, return the vnode even if not statd */ | |
1705 | if ((tvc->f.states & CStatd) || afs_InReadDir(tvc)) { | |
1706 | ReleaseSharedLock(&afs_xvcache); | |
1707 | return tvc; | |
1708 | } | |
1709 | } else { | |
1710 | UpgradeSToWLock(&afs_xvcache, 21); | |
1711 | ||
1712 | /* no cache entry, better grab one */ | |
1713 | tvc = afs_NewVCache(afid, NULL); | |
1714 | newvcache = 1; | |
1715 | ||
1716 | ConvertWToSLock(&afs_xvcache); | |
1717 | if (tvc == NULL) | |
1718 | { | |
1719 | ReleaseSharedLock(&afs_xvcache); | |
1720 | return NULL; | |
1721 | } | |
1722 | ||
1723 | afs_stats_cmperf.vcacheMisses++; | |
1724 | } | |
1725 | ||
1726 | ReleaseSharedLock(&afs_xvcache); | |
1727 | ||
1728 | ObtainWriteLock(&tvc->lock, 54); | |
1729 | ||
1730 | if (tvc->f.states & CStatd) { | |
1731 | ReleaseWriteLock(&tvc->lock); | |
1732 | return tvc; | |
1733 | } | |
1734 | #ifdef AFS_DARWIN80_ENV | |
1735 | /* Darwin 8.0 only has bufs in nfs, so we shouldn't have to worry about them. | |
1736 | What about ubc? */ | |
1737 | #else | |
1738 | #if defined(AFS_DARWIN_ENV) || defined(AFS_FBSD_ENV) | |
1739 | /* | |
1740 | * XXX - I really don't like this. Should try to understand better. | |
1741 | * It seems that sometimes, when we get called, we already hold the | |
1742 | * lock on the vnode (e.g., from afs_getattr via afs_VerifyVCache). | |
1743 | * We can't drop the vnode lock, because that could result in a race. | |
1744 | * Sometimes, though, we get here and don't hold the vnode lock. | |
1745 | * I hate code paths that sometimes hold locks and sometimes don't. | |
1746 | * In any event, the dodge we use here is to check whether the vnode | |
1747 | * is locked, and if it isn't, then we gain and drop it around the call | |
1748 | * to vinvalbuf; otherwise, we leave it alone. | |
1749 | */ | |
1750 | { | |
1751 | struct vnode *vp = AFSTOV(tvc); | |
1752 | int iheldthelock; | |
1753 | ||
1754 | #if defined(AFS_DARWIN_ENV) | |
1755 | iheldthelock = VOP_ISLOCKED(vp); | |
1756 | if (!iheldthelock) | |
1757 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, current_proc()); | |
1758 | /* this is messy. we can call fsync which will try to reobtain this */ | |
1759 | if (VTOAFS(vp) == tvc) | |
1760 | ReleaseWriteLock(&tvc->lock); | |
1761 | if (UBCINFOEXISTS(vp)) { | |
1762 | vinvalbuf(vp, V_SAVE, &afs_osi_cred, current_proc(), PINOD, 0); | |
1763 | } | |
1764 | if (VTOAFS(vp) == tvc) | |
1765 | ObtainWriteLock(&tvc->lock, 954); | |
1766 | if (!iheldthelock) | |
1767 | VOP_UNLOCK(vp, LK_EXCLUSIVE, current_proc()); | |
1768 | #elif defined(AFS_FBSD80_ENV) | |
1769 | iheldthelock = VOP_ISLOCKED(vp); | |
1770 | if (!iheldthelock) { | |
1771 | /* nosleep/sleep lock order reversal */ | |
1772 | int glocked = ISAFS_GLOCK(); | |
1773 | if (glocked) | |
1774 | AFS_GUNLOCK(); | |
1775 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); | |
1776 | if (glocked) | |
1777 | AFS_GLOCK(); | |
1778 | } | |
1779 | vinvalbuf(vp, V_SAVE, PINOD, 0); /* changed late in 8.0-CURRENT */ | |
1780 | if (!iheldthelock) | |
1781 | VOP_UNLOCK(vp, 0); | |
1782 | #elif defined(AFS_FBSD60_ENV) | |
1783 | iheldthelock = VOP_ISLOCKED(vp, curthread); | |
1784 | if (!iheldthelock) | |
1785 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread); | |
1786 | AFS_GUNLOCK(); | |
1787 | vinvalbuf(vp, V_SAVE, curthread, PINOD, 0); | |
1788 | AFS_GLOCK(); | |
1789 | if (!iheldthelock) | |
1790 | VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread); | |
1791 | #elif defined(AFS_FBSD_ENV) | |
1792 | iheldthelock = VOP_ISLOCKED(vp, curthread); | |
1793 | if (!iheldthelock) | |
1794 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread); | |
1795 | vinvalbuf(vp, V_SAVE, osi_curcred(), curthread, PINOD, 0); | |
1796 | if (!iheldthelock) | |
1797 | VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread); | |
1798 | #elif defined(AFS_OBSD_ENV) | |
1799 | iheldthelock = VOP_ISLOCKED(vp, curproc); | |
1800 | if (!iheldthelock) | |
1801 | VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY, curproc); | |
1802 | uvm_vnp_uncache(vp); | |
1803 | if (!iheldthelock) | |
1804 | VOP_UNLOCK(vp, 0, curproc); | |
1805 | #elif defined(AFS_NBSD40_ENV) | |
1806 | iheldthelock = VOP_ISLOCKED(vp); | |
1807 | if (!iheldthelock) { | |
1808 | VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY); | |
1809 | } | |
1810 | uvm_vnp_uncache(vp); | |
1811 | if (!iheldthelock) | |
1812 | VOP_UNLOCK(vp, 0); | |
1813 | #endif | |
1814 | } | |
1815 | #endif | |
1816 | #endif | |
1817 | ||
1818 | afs_StaleVCacheFlags(tvc, AFS_STALEVC_NODNLC | AFS_STALEVC_CLEARCB, | |
1819 | CUnique); | |
1820 | ||
1821 | /* It is always appropriate to throw away all the access rights? */ | |
1822 | afs_FreeAllAxs(&(tvc->Access)); | |
1823 | tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-volume info */ | |
1824 | if (tvp) { | |
1825 | if ((tvp->states & VForeign)) { | |
1826 | if (newvcache) | |
1827 | tvc->f.states |= CForeign; | |
1828 | if (newvcache && (tvp->rootVnode == afid->Fid.Vnode) | |
1829 | && (tvp->rootUnique == afid->Fid.Unique)) { | |
1830 | tvc->mvstat = AFS_MVSTAT_ROOT; | |
1831 | } | |
1832 | } | |
1833 | if (tvp->states & VRO) | |
1834 | tvc->f.states |= CRO; | |
1835 | if (tvp->states & VBackup) | |
1836 | tvc->f.states |= CBackup; | |
1837 | /* now copy ".." entry back out of volume structure, if necessary */ | |
1838 | if (tvc->mvstat == AFS_MVSTAT_ROOT && tvp->dotdot.Fid.Volume != 0) { | |
1839 | if (!tvc->mvid.parent) | |
1840 | tvc->mvid.parent = (struct VenusFid *) | |
1841 | osi_AllocSmallSpace(sizeof(struct VenusFid)); | |
1842 | *tvc->mvid.parent = tvp->dotdot; | |
1843 | } | |
1844 | afs_PutVolume(tvp, READ_LOCK); | |
1845 | } | |
1846 | ||
1847 | /* stat the file */ | |
1848 | afs_RemoveVCB(afid); | |
1849 | { | |
1850 | struct AFSFetchStatus OutStatus; | |
1851 | ||
1852 | if (afs_DynrootNewVnode(tvc, &OutStatus)) { | |
1853 | afs_ProcessFS(tvc, &OutStatus, areq); | |
1854 | tvc->f.states |= CStatd | CUnique; | |
1855 | tvc->f.parent.vnode = OutStatus.ParentVnode; | |
1856 | tvc->f.parent.unique = OutStatus.ParentUnique; | |
1857 | code = 0; | |
1858 | } else { | |
1859 | ||
1860 | if (AFS_IS_DISCONNECTED) { | |
1861 | /* Nothing to do otherwise...*/ | |
1862 | code = ENETDOWN; | |
1863 | /* printf("Network is down in afs_GetCache"); */ | |
1864 | } else | |
1865 | code = afs_FetchStatus(tvc, afid, areq, &OutStatus); | |
1866 | ||
1867 | /* For the NFS translator's benefit, make sure | |
1868 | * non-directory vnodes always have their parent FID set | |
1869 | * correctly, even when created as a result of decoding an | |
1870 | * NFS filehandle. It would be nice to also do this for | |
1871 | * directories, but we can't because the fileserver fills | |
1872 | * in the FID of the directory itself instead of that of | |
1873 | * its parent. | |
1874 | */ | |
1875 | if (!code && OutStatus.FileType != Directory && | |
1876 | !tvc->f.parent.vnode) { | |
1877 | tvc->f.parent.vnode = OutStatus.ParentVnode; | |
1878 | tvc->f.parent.unique = OutStatus.ParentUnique; | |
1879 | /* XXX - SXW - It's conceivable we should mark ourselves | |
1880 | * as dirty again here, incase we've been raced | |
1881 | * out of the FetchStatus call. | |
1882 | */ | |
1883 | } | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | if (code) { | |
1888 | ReleaseWriteLock(&tvc->lock); | |
1889 | ||
1890 | afs_PutVCache(tvc); | |
1891 | return NULL; | |
1892 | } | |
1893 | ||
1894 | ReleaseWriteLock(&tvc->lock); | |
1895 | return tvc; | |
1896 | ||
1897 | } /*afs_GetVCache */ | |
1898 | ||
1899 | ||
1900 | ||
1901 | /*! | |
1902 | * Lookup a vcache by fid. Look inside the cache first, if not | |
1903 | * there, lookup the file on the server, and then get it's fresh | |
1904 | * cache entry. | |
1905 | * | |
1906 | * \param afid | |
1907 | * \param areq | |
1908 | * \param cached Is element cached? If NULL, don't answer. | |
1909 | * \param adp | |
1910 | * \param aname | |
1911 | * | |
1912 | * \return The found element or NULL. | |
1913 | */ | |
1914 | struct vcache * | |
1915 | afs_LookupVCache(struct VenusFid *afid, struct vrequest *areq, | |
1916 | afs_int32 * cached, struct vcache *adp, char *aname) | |
1917 | { | |
1918 | afs_int32 code, now, newvcache = 0; | |
1919 | struct VenusFid nfid; | |
1920 | struct vcache *tvc; | |
1921 | struct volume *tvp; | |
1922 | struct AFSFetchStatus OutStatus; | |
1923 | struct AFSCallBack CallBack; | |
1924 | struct AFSVolSync tsync; | |
1925 | struct server *serverp = 0; | |
1926 | afs_int32 origCBs; | |
1927 | afs_int32 retry; | |
1928 | ||
1929 | AFS_STATCNT(afs_GetVCache); | |
1930 | if (cached) | |
1931 | *cached = 0; /* Init just in case */ | |
1932 | ||
1933 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
1934 | loop1: | |
1935 | #endif | |
1936 | ||
1937 | ObtainReadLock(&afs_xvcache); | |
1938 | tvc = afs_FindVCache(afid, &retry, DO_STATS /* no vlru */ ); | |
1939 | ||
1940 | if (tvc) { | |
1941 | ReleaseReadLock(&afs_xvcache); | |
1942 | if (retry) { | |
1943 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
1944 | spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD); | |
1945 | goto loop1; | |
1946 | #endif | |
1947 | } | |
1948 | ObtainReadLock(&tvc->lock); | |
1949 | ||
1950 | if (tvc->f.states & CStatd) { | |
1951 | if (cached) { | |
1952 | *cached = 1; | |
1953 | } | |
1954 | ReleaseReadLock(&tvc->lock); | |
1955 | return tvc; | |
1956 | } | |
1957 | tvc->f.states &= ~CUnique; | |
1958 | ||
1959 | ReleaseReadLock(&tvc->lock); | |
1960 | afs_PutVCache(tvc); | |
1961 | ObtainReadLock(&afs_xvcache); | |
1962 | } | |
1963 | /* if (tvc) */ | |
1964 | ReleaseReadLock(&afs_xvcache); | |
1965 | ||
1966 | /* lookup the file */ | |
1967 | nfid = *afid; | |
1968 | now = osi_Time(); | |
1969 | origCBs = afs_allCBs; /* if anything changes, we don't have a cb */ | |
1970 | ||
1971 | if (AFS_IS_DISCONNECTED) { | |
1972 | /* printf("Network is down in afs_LookupVcache\n"); */ | |
1973 | code = ENETDOWN; | |
1974 | } else | |
1975 | code = | |
1976 | afs_RemoteLookup(&adp->f.fid, areq, aname, &nfid, &OutStatus, | |
1977 | &CallBack, &serverp, &tsync); | |
1978 | ||
1979 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
1980 | loop2: | |
1981 | #endif | |
1982 | ||
1983 | ObtainSharedLock(&afs_xvcache, 6); | |
1984 | tvc = afs_FindVCache(&nfid, &retry, DO_VLRU | IS_SLOCK/* no xstats now */ ); | |
1985 | if (tvc && retry) { | |
1986 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
1987 | ReleaseSharedLock(&afs_xvcache); | |
1988 | spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD); | |
1989 | goto loop2; | |
1990 | #endif | |
1991 | } | |
1992 | ||
1993 | if (!tvc) { | |
1994 | /* no cache entry, better grab one */ | |
1995 | UpgradeSToWLock(&afs_xvcache, 22); | |
1996 | tvc = afs_NewVCache(&nfid, serverp); | |
1997 | newvcache = 1; | |
1998 | ConvertWToSLock(&afs_xvcache); | |
1999 | if (!tvc) | |
2000 | { | |
2001 | ReleaseSharedLock(&afs_xvcache); | |
2002 | return NULL; | |
2003 | } | |
2004 | } | |
2005 | ||
2006 | ReleaseSharedLock(&afs_xvcache); | |
2007 | ObtainWriteLock(&tvc->lock, 55); | |
2008 | ||
2009 | /* It is always appropriate to throw away all the access rights? */ | |
2010 | afs_FreeAllAxs(&(tvc->Access)); | |
2011 | tvp = afs_GetVolume(afid, areq, READ_LOCK); /* copy useful per-vol info */ | |
2012 | if (tvp) { | |
2013 | if ((tvp->states & VForeign)) { | |
2014 | if (newvcache) | |
2015 | tvc->f.states |= CForeign; | |
2016 | if (newvcache && (tvp->rootVnode == afid->Fid.Vnode) | |
2017 | && (tvp->rootUnique == afid->Fid.Unique)) | |
2018 | tvc->mvstat = AFS_MVSTAT_ROOT; | |
2019 | } | |
2020 | if (tvp->states & VRO) | |
2021 | tvc->f.states |= CRO; | |
2022 | if (tvp->states & VBackup) | |
2023 | tvc->f.states |= CBackup; | |
2024 | /* now copy ".." entry back out of volume structure, if necessary */ | |
2025 | if (tvc->mvstat == AFS_MVSTAT_ROOT && tvp->dotdot.Fid.Volume != 0) { | |
2026 | if (!tvc->mvid.parent) | |
2027 | tvc->mvid.parent = (struct VenusFid *) | |
2028 | osi_AllocSmallSpace(sizeof(struct VenusFid)); | |
2029 | *tvc->mvid.parent = tvp->dotdot; | |
2030 | } | |
2031 | } | |
2032 | ||
2033 | if (code) { | |
2034 | afs_StaleVCacheFlags(tvc, 0, CUnique); | |
2035 | if (tvp) | |
2036 | afs_PutVolume(tvp, READ_LOCK); | |
2037 | ReleaseWriteLock(&tvc->lock); | |
2038 | afs_PutVCache(tvc); | |
2039 | return NULL; | |
2040 | } | |
2041 | ||
2042 | ObtainWriteLock(&afs_xcbhash, 466); | |
2043 | if (origCBs == afs_allCBs) { | |
2044 | if (CallBack.ExpirationTime) { | |
2045 | tvc->callback = serverp; | |
2046 | tvc->cbExpires = CallBack.ExpirationTime + now; | |
2047 | tvc->f.states |= CStatd | CUnique; | |
2048 | tvc->f.states &= ~CBulkFetching; | |
2049 | afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvp); | |
2050 | } else if (tvc->f.states & CRO) { | |
2051 | /* adapt gives us an hour. */ | |
2052 | tvc->cbExpires = 3600 + osi_Time(); | |
2053 | /*XXX*/ tvc->f.states |= CStatd | CUnique; | |
2054 | tvc->f.states &= ~CBulkFetching; | |
2055 | afs_QueueCallback(tvc, CBHash(3600), tvp); | |
2056 | } else { | |
2057 | afs_StaleVCacheFlags(tvc, | |
2058 | AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB, | |
2059 | CUnique); | |
2060 | } | |
2061 | } else { | |
2062 | afs_StaleVCacheFlags(tvc, | |
2063 | AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB, | |
2064 | CUnique); | |
2065 | } | |
2066 | ReleaseWriteLock(&afs_xcbhash); | |
2067 | if (tvp) | |
2068 | afs_PutVolume(tvp, READ_LOCK); | |
2069 | afs_ProcessFS(tvc, &OutStatus, areq); | |
2070 | ||
2071 | ReleaseWriteLock(&tvc->lock); | |
2072 | return tvc; | |
2073 | ||
2074 | } | |
2075 | ||
2076 | struct vcache * | |
2077 | afs_GetRootVCache(struct VenusFid *afid, struct vrequest *areq, | |
2078 | afs_int32 * cached, struct volume *tvolp) | |
2079 | { | |
2080 | afs_int32 code = 0, i, newvcache = 0, haveStatus = 0; | |
2081 | afs_int32 getNewFid = 0; | |
2082 | afs_uint32 start; | |
2083 | struct VenusFid nfid; | |
2084 | struct vcache *tvc; | |
2085 | struct server *serverp = 0; | |
2086 | struct AFSFetchStatus OutStatus; | |
2087 | struct AFSCallBack CallBack; | |
2088 | struct AFSVolSync tsync; | |
2089 | int origCBs = 0; | |
2090 | #ifdef AFS_DARWIN80_ENV | |
2091 | vnode_t tvp; | |
2092 | #endif | |
2093 | ||
2094 | start = osi_Time(); | |
2095 | ||
2096 | newmtpt: | |
2097 | if (!tvolp->rootVnode || getNewFid) { | |
2098 | struct VenusFid tfid; | |
2099 | ||
2100 | tfid = *afid; | |
2101 | tfid.Fid.Vnode = 0; /* Means get rootfid of volume */ | |
2102 | origCBs = afs_allCBs; /* ignore InitCallBackState */ | |
2103 | code = | |
2104 | afs_RemoteLookup(&tfid, areq, NULL, &nfid, &OutStatus, &CallBack, | |
2105 | &serverp, &tsync); | |
2106 | if (code) { | |
2107 | return NULL; | |
2108 | } | |
2109 | /* ReleaseReadLock(&tvolp->lock); */ | |
2110 | ObtainWriteLock(&tvolp->lock, 56); | |
2111 | tvolp->rootVnode = afid->Fid.Vnode = nfid.Fid.Vnode; | |
2112 | tvolp->rootUnique = afid->Fid.Unique = nfid.Fid.Unique; | |
2113 | ReleaseWriteLock(&tvolp->lock); | |
2114 | /* ObtainReadLock(&tvolp->lock);*/ | |
2115 | haveStatus = 1; | |
2116 | } else { | |
2117 | afid->Fid.Vnode = tvolp->rootVnode; | |
2118 | afid->Fid.Unique = tvolp->rootUnique; | |
2119 | } | |
2120 | ||
2121 | rootvc_loop: | |
2122 | ObtainSharedLock(&afs_xvcache, 7); | |
2123 | i = VCHash(afid); | |
2124 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
2125 | if (!FidCmp(&(tvc->f.fid), afid)) { | |
2126 | if (tvc->f.states & CVInit) { | |
2127 | ReleaseSharedLock(&afs_xvcache); | |
2128 | afs_osi_Sleep(&tvc->f.states); | |
2129 | goto rootvc_loop; | |
2130 | } | |
2131 | #ifdef AFS_DARWIN80_ENV | |
2132 | if (tvc->f.states & CDeadVnode) { | |
2133 | ReleaseSharedLock(&afs_xvcache); | |
2134 | afs_osi_Sleep(&tvc->f.states); | |
2135 | goto rootvc_loop; | |
2136 | } | |
2137 | tvp = AFSTOV(tvc); | |
2138 | if (vnode_get(tvp)) /* this bumps ref count */ | |
2139 | continue; | |
2140 | if (vnode_ref(tvp)) { | |
2141 | AFS_GUNLOCK(); | |
2142 | /* AFSTOV(tvc) may be NULL */ | |
2143 | vnode_put(tvp); | |
2144 | AFS_GLOCK(); | |
2145 | continue; | |
2146 | } | |
2147 | #endif | |
2148 | break; | |
2149 | } | |
2150 | } | |
2151 | ||
2152 | if (!haveStatus && (!tvc || !(tvc->f.states & CStatd))) { | |
2153 | /* Mount point no longer stat'd or unknown. FID may have changed. */ | |
2154 | getNewFid = 1; | |
2155 | ReleaseSharedLock(&afs_xvcache); | |
2156 | #ifdef AFS_DARWIN80_ENV | |
2157 | if (tvc) { | |
2158 | AFS_GUNLOCK(); | |
2159 | vnode_put(AFSTOV(tvc)); | |
2160 | vnode_rele(AFSTOV(tvc)); | |
2161 | AFS_GLOCK(); | |
2162 | } | |
2163 | #endif | |
2164 | tvc = NULL; | |
2165 | goto newmtpt; | |
2166 | } | |
2167 | ||
2168 | if (!tvc) { | |
2169 | UpgradeSToWLock(&afs_xvcache, 23); | |
2170 | /* no cache entry, better grab one */ | |
2171 | tvc = afs_NewVCache(afid, NULL); | |
2172 | if (!tvc) | |
2173 | { | |
2174 | ReleaseWriteLock(&afs_xvcache); | |
2175 | return NULL; | |
2176 | } | |
2177 | newvcache = 1; | |
2178 | afs_stats_cmperf.vcacheMisses++; | |
2179 | } else { | |
2180 | if (cached) | |
2181 | *cached = 1; | |
2182 | afs_stats_cmperf.vcacheHits++; | |
2183 | #if defined(AFS_DARWIN80_ENV) | |
2184 | /* we already bumped the ref count in the for loop above */ | |
2185 | #else /* AFS_DARWIN80_ENV */ | |
2186 | osi_vnhold(tvc, 0); | |
2187 | #endif | |
2188 | UpgradeSToWLock(&afs_xvcache, 24); | |
2189 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
2190 | refpanic("GRVC VLRU inconsistent0"); | |
2191 | } | |
2192 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
2193 | refpanic("GRVC VLRU inconsistent1"); | |
2194 | } | |
2195 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
2196 | refpanic("GRVC VLRU inconsistent2"); | |
2197 | } | |
2198 | QRemove(&tvc->vlruq); /* move to lruq head */ | |
2199 | QAdd(&VLRU, &tvc->vlruq); | |
2200 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
2201 | refpanic("GRVC VLRU inconsistent3"); | |
2202 | } | |
2203 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
2204 | refpanic("GRVC VLRU inconsistent4"); | |
2205 | } | |
2206 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
2207 | refpanic("GRVC VLRU inconsistent5"); | |
2208 | } | |
2209 | vcachegen++; | |
2210 | } | |
2211 | ||
2212 | ReleaseWriteLock(&afs_xvcache); | |
2213 | ||
2214 | if (tvc->f.states & CStatd) { | |
2215 | return tvc; | |
2216 | } else { | |
2217 | ||
2218 | ObtainReadLock(&tvc->lock); | |
2219 | tvc->f.states &= ~CUnique; | |
2220 | tvc->callback = NULL; /* redundant, perhaps */ | |
2221 | ReleaseReadLock(&tvc->lock); | |
2222 | } | |
2223 | ||
2224 | ObtainWriteLock(&tvc->lock, 57); | |
2225 | ||
2226 | /* It is always appropriate to throw away all the access rights? */ | |
2227 | afs_FreeAllAxs(&(tvc->Access)); | |
2228 | ||
2229 | if (newvcache) | |
2230 | tvc->f.states |= CForeign; | |
2231 | if (tvolp->states & VRO) | |
2232 | tvc->f.states |= CRO; | |
2233 | if (tvolp->states & VBackup) | |
2234 | tvc->f.states |= CBackup; | |
2235 | /* now copy ".." entry back out of volume structure, if necessary */ | |
2236 | if (newvcache && (tvolp->rootVnode == afid->Fid.Vnode) | |
2237 | && (tvolp->rootUnique == afid->Fid.Unique)) { | |
2238 | tvc->mvstat = AFS_MVSTAT_ROOT; | |
2239 | } | |
2240 | if (tvc->mvstat == AFS_MVSTAT_ROOT && tvolp->dotdot.Fid.Volume != 0) { | |
2241 | if (!tvc->mvid.parent) | |
2242 | tvc->mvid.parent = (struct VenusFid *) | |
2243 | osi_AllocSmallSpace(sizeof(struct VenusFid)); | |
2244 | *tvc->mvid.parent = tvolp->dotdot; | |
2245 | } | |
2246 | ||
2247 | /* stat the file */ | |
2248 | afs_RemoveVCB(afid); | |
2249 | ||
2250 | if (!haveStatus) { | |
2251 | struct VenusFid tfid; | |
2252 | ||
2253 | tfid = *afid; | |
2254 | tfid.Fid.Vnode = 0; /* Means get rootfid of volume */ | |
2255 | origCBs = afs_allCBs; /* ignore InitCallBackState */ | |
2256 | code = | |
2257 | afs_RemoteLookup(&tfid, areq, NULL, &nfid, &OutStatus, &CallBack, | |
2258 | &serverp, &tsync); | |
2259 | } | |
2260 | ||
2261 | if (code) { | |
2262 | afs_StaleVCacheFlags(tvc, AFS_STALEVC_CLEARCB, CUnique); | |
2263 | ReleaseWriteLock(&tvc->lock); | |
2264 | afs_PutVCache(tvc); | |
2265 | return NULL; | |
2266 | } | |
2267 | ||
2268 | ObtainWriteLock(&afs_xcbhash, 468); | |
2269 | if (origCBs == afs_allCBs) { | |
2270 | tvc->f.states |= CTruth; | |
2271 | tvc->callback = serverp; | |
2272 | if (CallBack.ExpirationTime != 0) { | |
2273 | tvc->cbExpires = CallBack.ExpirationTime + start; | |
2274 | tvc->f.states |= CStatd; | |
2275 | tvc->f.states &= ~CBulkFetching; | |
2276 | afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), tvolp); | |
2277 | } else if (tvc->f.states & CRO) { | |
2278 | /* adapt gives us an hour. */ | |
2279 | tvc->cbExpires = 3600 + osi_Time(); | |
2280 | /*XXX*/ tvc->f.states |= CStatd; | |
2281 | tvc->f.states &= ~CBulkFetching; | |
2282 | afs_QueueCallback(tvc, CBHash(3600), tvolp); | |
2283 | } | |
2284 | } else { | |
2285 | afs_StaleVCacheFlags(tvc, AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB, | |
2286 | CUnique); | |
2287 | } | |
2288 | ReleaseWriteLock(&afs_xcbhash); | |
2289 | afs_ProcessFS(tvc, &OutStatus, areq); | |
2290 | ||
2291 | ReleaseWriteLock(&tvc->lock); | |
2292 | return tvc; | |
2293 | } | |
2294 | ||
2295 | ||
2296 | /*! | |
2297 | * Update callback status and (sometimes) attributes of a vnode. | |
2298 | * Called after doing a fetch status RPC. Whilst disconnected, attributes | |
2299 | * shouldn't be written to the vcache here. | |
2300 | * | |
2301 | * \param avc | |
2302 | * \param afid | |
2303 | * \param areq | |
2304 | * \param Outsp Server status after rpc call. | |
2305 | * \param acb Callback for this vnode. | |
2306 | * | |
2307 | * \note The vcache must be write locked. | |
2308 | */ | |
2309 | void | |
2310 | afs_UpdateStatus(struct vcache *avc, struct VenusFid *afid, | |
2311 | struct vrequest *areq, struct AFSFetchStatus *Outsp, | |
2312 | struct AFSCallBack *acb, afs_uint32 start) | |
2313 | { | |
2314 | struct volume *volp; | |
2315 | ||
2316 | if (!AFS_IN_SYNC) | |
2317 | /* Dont write status in vcache if resyncing after a disconnection. */ | |
2318 | afs_ProcessFS(avc, Outsp, areq); | |
2319 | ||
2320 | volp = afs_GetVolume(afid, areq, READ_LOCK); | |
2321 | ObtainWriteLock(&afs_xcbhash, 469); | |
2322 | avc->f.states |= CTruth; | |
2323 | if (avc->callback /* check for race */ ) { | |
2324 | if (acb->ExpirationTime != 0) { | |
2325 | avc->cbExpires = acb->ExpirationTime + start; | |
2326 | avc->f.states |= CStatd; | |
2327 | avc->f.states &= ~CBulkFetching; | |
2328 | afs_QueueCallback(avc, CBHash(acb->ExpirationTime), volp); | |
2329 | } else if (avc->f.states & CRO) { | |
2330 | /* ordinary callback on a read-only volume -- AFS 3.2 style */ | |
2331 | avc->cbExpires = 3600 + start; | |
2332 | avc->f.states |= CStatd; | |
2333 | avc->f.states &= ~CBulkFetching; | |
2334 | afs_QueueCallback(avc, CBHash(3600), volp); | |
2335 | } else { | |
2336 | afs_StaleVCacheFlags(avc, | |
2337 | AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB, | |
2338 | CUnique); | |
2339 | } | |
2340 | } else { | |
2341 | afs_StaleVCacheFlags(avc, AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB, | |
2342 | CUnique); | |
2343 | } | |
2344 | ReleaseWriteLock(&afs_xcbhash); | |
2345 | if (volp) | |
2346 | afs_PutVolume(volp, READ_LOCK); | |
2347 | } | |
2348 | ||
2349 | void | |
2350 | afs_BadFetchStatus(struct afs_conn *tc) | |
2351 | { | |
2352 | int addr = ntohl(tc->parent->srvr->sa_ip); | |
2353 | afs_warn("afs: Invalid AFSFetchStatus from server %u.%u.%u.%u\n", | |
2354 | (addr >> 24) & 0xff, (addr >> 16) & 0xff, (addr >> 8) & 0xff, | |
2355 | (addr) & 0xff); | |
2356 | afs_warn("afs: This suggests the server may be sending bad data that " | |
2357 | "can lead to availability issues or data corruption. The " | |
2358 | "issue has been avoided for now, but it may not always be " | |
2359 | "detectable. Please upgrade the server if possible.\n"); | |
2360 | } | |
2361 | ||
2362 | /** | |
2363 | * Check if a given AFSFetchStatus structure is sane. | |
2364 | * | |
2365 | * @param[in] tc The server from which we received the status | |
2366 | * @param[in] status The status we received | |
2367 | * | |
2368 | * @return whether the given structure is valid or not | |
2369 | * @retval 0 the structure is fine | |
2370 | * @retval nonzero the structure looks like garbage; act as if we received | |
2371 | * the returned error code from the server | |
2372 | */ | |
2373 | int | |
2374 | afs_CheckFetchStatus(struct afs_conn *tc, struct AFSFetchStatus *status) | |
2375 | { | |
2376 | if (status->errorCode || | |
2377 | status->InterfaceVersion != 1 || | |
2378 | !(status->FileType > Invalid && status->FileType <= SymbolicLink) || | |
2379 | status->ParentVnode == 0 || status->ParentUnique == 0) { | |
2380 | ||
2381 | afs_warn("afs: FetchStatus ec %u iv %u ft %u pv %u pu %u\n", | |
2382 | (unsigned)status->errorCode, (unsigned)status->InterfaceVersion, | |
2383 | (unsigned)status->FileType, (unsigned)status->ParentVnode, | |
2384 | (unsigned)status->ParentUnique); | |
2385 | afs_BadFetchStatus(tc); | |
2386 | ||
2387 | return VBUSY; | |
2388 | } | |
2389 | return 0; | |
2390 | } | |
2391 | ||
2392 | /*! | |
2393 | * Must be called with avc write-locked | |
2394 | * don't absolutely have to invalidate the hint unless the dv has | |
2395 | * changed, but be sure to get it right else there will be consistency bugs. | |
2396 | */ | |
2397 | afs_int32 | |
2398 | afs_FetchStatus(struct vcache * avc, struct VenusFid * afid, | |
2399 | struct vrequest * areq, struct AFSFetchStatus * Outsp) | |
2400 | { | |
2401 | int code; | |
2402 | afs_uint32 start = 0; | |
2403 | struct afs_conn *tc; | |
2404 | struct AFSCallBack CallBack; | |
2405 | struct AFSVolSync tsync; | |
2406 | struct rx_connection *rxconn; | |
2407 | XSTATS_DECLS; | |
2408 | do { | |
2409 | tc = afs_Conn(afid, areq, SHARED_LOCK, &rxconn); | |
2410 | avc->dchint = NULL; /* invalidate hints */ | |
2411 | if (tc) { | |
2412 | avc->callback = tc->parent->srvr->server; | |
2413 | start = osi_Time(); | |
2414 | XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_FETCHSTATUS); | |
2415 | RX_AFS_GUNLOCK(); | |
2416 | code = | |
2417 | RXAFS_FetchStatus(rxconn, (struct AFSFid *)&afid->Fid, Outsp, | |
2418 | &CallBack, &tsync); | |
2419 | RX_AFS_GLOCK(); | |
2420 | ||
2421 | XSTATS_END_TIME; | |
2422 | ||
2423 | if (code == 0) { | |
2424 | code = afs_CheckFetchStatus(tc, Outsp); | |
2425 | } | |
2426 | ||
2427 | } else | |
2428 | code = -1; | |
2429 | } while (afs_Analyze | |
2430 | (tc, rxconn, code, afid, areq, AFS_STATS_FS_RPCIDX_FETCHSTATUS, | |
2431 | SHARED_LOCK, NULL)); | |
2432 | ||
2433 | if (!code) { | |
2434 | afs_UpdateStatus(avc, afid, areq, Outsp, &CallBack, start); | |
2435 | } else { | |
2436 | /* used to undo the local callback, but that's too extreme. | |
2437 | * There are plenty of good reasons that fetchstatus might return | |
2438 | * an error, such as EPERM. If we have the vnode cached, statd, | |
2439 | * with callback, might as well keep track of the fact that we | |
2440 | * don't have access... | |
2441 | */ | |
2442 | if (code == EPERM || code == EACCES) { | |
2443 | struct axscache *ac; | |
2444 | if (avc->Access && (ac = afs_FindAxs(avc->Access, areq->uid))) | |
2445 | ac->axess = 0; | |
2446 | else /* not found, add a new one if possible */ | |
2447 | afs_AddAxs(avc->Access, areq->uid, 0); | |
2448 | } | |
2449 | } | |
2450 | return code; | |
2451 | } | |
2452 | ||
2453 | #if 0 | |
2454 | /* | |
2455 | * afs_StuffVcache | |
2456 | * | |
2457 | * Description: | |
2458 | * Stuff some information into the vcache for the given file. | |
2459 | * | |
2460 | * Parameters: | |
2461 | * afid : File in question. | |
2462 | * OutStatus : Fetch status on the file. | |
2463 | * CallBack : Callback info. | |
2464 | * tc : RPC connection involved. | |
2465 | * areq : vrequest involved. | |
2466 | * | |
2467 | * Environment: | |
2468 | * Nothing interesting. | |
2469 | */ | |
2470 | void | |
2471 | afs_StuffVcache(struct VenusFid *afid, | |
2472 | struct AFSFetchStatus *OutStatus, | |
2473 | struct AFSCallBack *CallBack, struct afs_conn *tc, | |
2474 | struct vrequest *areq) | |
2475 | { | |
2476 | afs_int32 code, i, newvcache = 0; | |
2477 | struct vcache *tvc; | |
2478 | struct AFSVolSync tsync; | |
2479 | struct volume *tvp; | |
2480 | struct axscache *ac; | |
2481 | afs_int32 retry; | |
2482 | ||
2483 | AFS_STATCNT(afs_StuffVcache); | |
2484 | #ifdef IFS_VCACHECOUNT | |
2485 | ifs_gvcachecall++; | |
2486 | #endif | |
2487 | ||
2488 | loop: | |
2489 | ObtainSharedLock(&afs_xvcache, 8); | |
2490 | ||
2491 | tvc = afs_FindVCache(afid, &retry, DO_VLRU| IS_SLOCK /* no stats */ ); | |
2492 | if (tvc && retry) { | |
2493 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
2494 | ReleaseSharedLock(&afs_xvcache); | |
2495 | spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD); | |
2496 | goto loop; | |
2497 | #endif | |
2498 | } | |
2499 | ||
2500 | if (!tvc) { | |
2501 | /* no cache entry, better grab one */ | |
2502 | UpgradeSToWLock(&afs_xvcache, 25); | |
2503 | tvc = afs_NewVCache(afid, NULL); | |
2504 | newvcache = 1; | |
2505 | ConvertWToSLock(&afs_xvcache); | |
2506 | if (!tvc) | |
2507 | { | |
2508 | ReleaseSharedLock(&afs_xvcache); | |
2509 | return NULL; | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | ReleaseSharedLock(&afs_xvcache); | |
2514 | ObtainWriteLock(&tvc->lock, 58); | |
2515 | ||
2516 | afs_StaleVCacheFlags(tvc, AFS_STALEVC_NOCB, 0); | |
2517 | ||
2518 | /* Is it always appropriate to throw away all the access rights? */ | |
2519 | afs_FreeAllAxs(&(tvc->Access)); | |
2520 | ||
2521 | /*Copy useful per-volume info */ | |
2522 | tvp = afs_GetVolume(afid, areq, READ_LOCK); | |
2523 | if (tvp) { | |
2524 | if (newvcache && (tvp->states & VForeign)) | |
2525 | tvc->f.states |= CForeign; | |
2526 | if (tvp->states & VRO) | |
2527 | tvc->f.states |= CRO; | |
2528 | if (tvp->states & VBackup) | |
2529 | tvc->f.states |= CBackup; | |
2530 | /* | |
2531 | * Now, copy ".." entry back out of volume structure, if | |
2532 | * necessary | |
2533 | */ | |
2534 | if (tvc->mvstat == AFS_MVSTAT_ROOT && tvp->dotdot.Fid.Volume != 0) { | |
2535 | if (!tvc->mvid.parent) | |
2536 | tvc->mvid.parent = (struct VenusFid *) | |
2537 | osi_AllocSmallSpace(sizeof(struct VenusFid)); | |
2538 | *tvc->mvid.parent = tvp->dotdot; | |
2539 | } | |
2540 | } | |
2541 | /* store the stat on the file */ | |
2542 | afs_RemoveVCB(afid); | |
2543 | afs_ProcessFS(tvc, OutStatus, areq); | |
2544 | tvc->callback = tc->srvr->server; | |
2545 | ||
2546 | /* we use osi_Time twice below. Ideally, we would use the time at which | |
2547 | * the FetchStatus call began, instead, but we don't have it here. So we | |
2548 | * make do with "now". In the CRO case, it doesn't really matter. In | |
2549 | * the other case, we hope that the difference between "now" and when the | |
2550 | * call actually began execution on the server won't be larger than the | |
2551 | * padding which the server keeps. Subtract 1 second anyway, to be on | |
2552 | * the safe side. Can't subtract more because we don't know how big | |
2553 | * ExpirationTime is. Possible consistency problems may arise if the call | |
2554 | * timeout period becomes longer than the server's expiration padding. */ | |
2555 | ObtainWriteLock(&afs_xcbhash, 470); | |
2556 | if (CallBack->ExpirationTime != 0) { | |
2557 | tvc->cbExpires = CallBack->ExpirationTime + osi_Time() - 1; | |
2558 | tvc->f.states |= CStatd; | |
2559 | tvc->f.states &= ~CBulkFetching; | |
2560 | afs_QueueCallback(tvc, CBHash(CallBack->ExpirationTime), tvp); | |
2561 | } else if (tvc->f.states & CRO) { | |
2562 | /* old-fashioned AFS 3.2 style */ | |
2563 | tvc->cbExpires = 3600 + osi_Time(); | |
2564 | /*XXX*/ tvc->f.states |= CStatd; | |
2565 | tvc->f.states &= ~CBulkFetching; | |
2566 | afs_QueueCallback(tvc, CBHash(3600), tvp); | |
2567 | } else { | |
2568 | afs_StaleVCacheFlags(tvc, AFS_STALEVC_CBLOCKED | AFS_STALEVC_CLEARCB, | |
2569 | CUnique); | |
2570 | } | |
2571 | ReleaseWriteLock(&afs_xcbhash); | |
2572 | if (tvp) | |
2573 | afs_PutVolume(tvp, READ_LOCK); | |
2574 | ||
2575 | /* look in per-pag cache */ | |
2576 | if (tvc->Access && (ac = afs_FindAxs(tvc->Access, areq->uid))) | |
2577 | ac->axess = OutStatus->CallerAccess; /* substitute pags */ | |
2578 | else /* not found, add a new one if possible */ | |
2579 | afs_AddAxs(tvc->Access, areq->uid, OutStatus->CallerAccess); | |
2580 | ||
2581 | ReleaseWriteLock(&tvc->lock); | |
2582 | afs_Trace4(afs_iclSetp, CM_TRACE_STUFFVCACHE, ICL_TYPE_POINTER, tvc, | |
2583 | ICL_TYPE_POINTER, tvc->callback, ICL_TYPE_INT32, | |
2584 | tvc->cbExpires, ICL_TYPE_INT32, tvc->cbExpires - osi_Time()); | |
2585 | /* | |
2586 | * Release ref count... hope this guy stays around... | |
2587 | */ | |
2588 | afs_PutVCache(tvc); | |
2589 | } /*afs_StuffVcache */ | |
2590 | #endif | |
2591 | ||
2592 | /*! | |
2593 | * Decrements the reference count on a cache entry. | |
2594 | * | |
2595 | * \param avc Pointer to the cache entry to decrement. | |
2596 | * | |
2597 | * \note Environment: Nothing interesting. | |
2598 | */ | |
2599 | void | |
2600 | afs_PutVCache(struct vcache *avc) | |
2601 | { | |
2602 | AFS_STATCNT(afs_PutVCache); | |
2603 | #ifdef AFS_DARWIN80_ENV | |
2604 | vnode_put(AFSTOV(avc)); | |
2605 | AFS_FAST_RELE(avc); | |
2606 | #else | |
2607 | /* | |
2608 | * Can we use a read lock here? | |
2609 | */ | |
2610 | ObtainReadLock(&afs_xvcache); | |
2611 | AFS_FAST_RELE(avc); | |
2612 | ReleaseReadLock(&afs_xvcache); | |
2613 | #endif | |
2614 | } /*afs_PutVCache */ | |
2615 | ||
2616 | ||
2617 | /*! | |
2618 | * Reset a vcache entry, so local contents are ignored, and the | |
2619 | * server will be reconsulted next time the vcache is used | |
2620 | * | |
2621 | * \param avc Pointer to the cache entry to reset | |
2622 | * \param acred | |
2623 | * \param skipdnlc skip the dnlc purge for this vnode | |
2624 | * | |
2625 | * \note avc must be write locked on entry | |
2626 | * | |
2627 | * \note The caller should purge the dnlc when skipdnlc is set. | |
2628 | */ | |
2629 | void | |
2630 | afs_ResetVCache(struct vcache *avc, afs_ucred_t *acred, afs_int32 skipdnlc) | |
2631 | { | |
2632 | afs_stalevc_flags_t flags = 0; | |
2633 | if (skipdnlc) { | |
2634 | flags |= AFS_STALEVC_NODNLC; | |
2635 | } | |
2636 | ||
2637 | afs_StaleVCacheFlags(avc, flags, CDirty); /* next reference will re-stat */ | |
2638 | /* now find the disk cache entries */ | |
2639 | afs_TryToSmush(avc, acred, 1); | |
2640 | if (avc->linkData && !(avc->f.states & CCore)) { | |
2641 | afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1); | |
2642 | avc->linkData = NULL; | |
2643 | } | |
2644 | } | |
2645 | ||
2646 | /*! | |
2647 | * Sleepa when searching for a vcache. Releases all the pending locks, | |
2648 | * sleeps then obtains the previously released locks. | |
2649 | * | |
2650 | * \param vcache Enter sleep state. | |
2651 | * \param flag Determines what locks to use. | |
2652 | * | |
2653 | * \return | |
2654 | */ | |
2655 | static void | |
2656 | findvc_sleep(struct vcache *avc, int flag) | |
2657 | { | |
2658 | if (flag & IS_SLOCK) { | |
2659 | ReleaseSharedLock(&afs_xvcache); | |
2660 | } else { | |
2661 | if (flag & IS_WLOCK) { | |
2662 | ReleaseWriteLock(&afs_xvcache); | |
2663 | } else { | |
2664 | ReleaseReadLock(&afs_xvcache); | |
2665 | } | |
2666 | } | |
2667 | afs_osi_Sleep(&avc->f.states); | |
2668 | if (flag & IS_SLOCK) { | |
2669 | ObtainSharedLock(&afs_xvcache, 341); | |
2670 | } else { | |
2671 | if (flag & IS_WLOCK) { | |
2672 | ObtainWriteLock(&afs_xvcache, 343); | |
2673 | } else { | |
2674 | ObtainReadLock(&afs_xvcache); | |
2675 | } | |
2676 | } | |
2677 | } | |
2678 | ||
2679 | /*! | |
2680 | * Add a reference on an existing vcache entry. | |
2681 | * | |
2682 | * \param tvc Pointer to the vcache. | |
2683 | * | |
2684 | * \note Environment: Must be called with at least one reference from | |
2685 | * elsewhere on the vcache, even if that reference will be dropped. | |
2686 | * The global lock is required. | |
2687 | * | |
2688 | * \return 0 on success, -1 on failure. | |
2689 | */ | |
2690 | ||
2691 | int | |
2692 | afs_RefVCache(struct vcache *tvc) | |
2693 | { | |
2694 | #ifdef AFS_DARWIN80_ENV | |
2695 | vnode_t tvp; | |
2696 | #endif | |
2697 | ||
2698 | /* AFS_STATCNT(afs_RefVCache); */ | |
2699 | ||
2700 | #ifdef AFS_DARWIN80_ENV | |
2701 | tvp = AFSTOV(tvc); | |
2702 | if (vnode_get(tvp)) | |
2703 | return -1; | |
2704 | if (vnode_ref(tvp)) { | |
2705 | AFS_GUNLOCK(); | |
2706 | /* AFSTOV(tvc) may be NULL */ | |
2707 | vnode_put(tvp); | |
2708 | AFS_GLOCK(); | |
2709 | return -1; | |
2710 | } | |
2711 | #else | |
2712 | osi_vnhold(tvc, 0); | |
2713 | #endif | |
2714 | return 0; | |
2715 | } /*afs_RefVCache */ | |
2716 | ||
2717 | /*! | |
2718 | * Find a vcache entry given a fid. | |
2719 | * | |
2720 | * \param afid Pointer to the fid whose cache entry we desire. | |
2721 | * \param retry (SGI-specific) tell the caller to drop the lock on xvcache, | |
2722 | * unlock the vnode, and try again. | |
2723 | * \param flag Bit 1 to specify whether to compute hit statistics. Not | |
2724 | * set if FindVCache is called as part of internal bookkeeping. | |
2725 | * | |
2726 | * \note Environment: Must be called with the afs_xvcache lock at least held at | |
2727 | * the read level. In order to do the VLRU adjustment, the xvcache lock | |
2728 | * must be shared-- we upgrade it here. | |
2729 | */ | |
2730 | ||
2731 | struct vcache * | |
2732 | afs_FindVCache(struct VenusFid *afid, afs_int32 * retry, afs_int32 flag) | |
2733 | { | |
2734 | ||
2735 | struct vcache *tvc; | |
2736 | afs_int32 i; | |
2737 | #ifdef AFS_DARWIN80_ENV | |
2738 | struct vcache *deadvc = NULL, *livevc = NULL; | |
2739 | vnode_t tvp; | |
2740 | #endif | |
2741 | ||
2742 | AFS_STATCNT(afs_FindVCache); | |
2743 | ||
2744 | findloop: | |
2745 | i = VCHash(afid); | |
2746 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
2747 | if (FidMatches(afid, tvc)) { | |
2748 | if (tvc->f.states & CVInit) { | |
2749 | findvc_sleep(tvc, flag); | |
2750 | goto findloop; | |
2751 | } | |
2752 | #ifdef AFS_DARWIN80_ENV | |
2753 | if (tvc->f.states & CDeadVnode) { | |
2754 | findvc_sleep(tvc, flag); | |
2755 | goto findloop; | |
2756 | } | |
2757 | #endif | |
2758 | break; | |
2759 | } | |
2760 | } | |
2761 | ||
2762 | /* should I have a read lock on the vnode here? */ | |
2763 | if (tvc) { | |
2764 | if (retry) | |
2765 | *retry = 0; | |
2766 | #if defined(AFS_DARWIN80_ENV) | |
2767 | tvp = AFSTOV(tvc); | |
2768 | if (vnode_get(tvp)) | |
2769 | tvp = NULL; | |
2770 | if (tvp && vnode_ref(tvp)) { | |
2771 | AFS_GUNLOCK(); | |
2772 | /* AFSTOV(tvc) may be NULL */ | |
2773 | vnode_put(tvp); | |
2774 | AFS_GLOCK(); | |
2775 | tvp = NULL; | |
2776 | } | |
2777 | if (!tvp) { | |
2778 | tvc = NULL; | |
2779 | return tvc; | |
2780 | } | |
2781 | #elif defined(AFS_DARWIN_ENV) | |
2782 | tvc->f.states |= CUBCinit; | |
2783 | AFS_GUNLOCK(); | |
2784 | if (UBCINFOMISSING(AFSTOV(tvc)) || | |
2785 | UBCINFORECLAIMED(AFSTOV(tvc))) { | |
2786 | ubc_info_init(AFSTOV(tvc)); | |
2787 | } | |
2788 | AFS_GLOCK(); | |
2789 | tvc->f.states &= ~CUBCinit; | |
2790 | #else | |
2791 | osi_vnhold(tvc, retry); /* already held, above */ | |
2792 | if (retry && *retry) | |
2793 | return 0; | |
2794 | #endif | |
2795 | /* | |
2796 | * only move to front of vlru if we have proper vcache locking) | |
2797 | */ | |
2798 | if (flag & DO_VLRU) { | |
2799 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
2800 | refpanic("FindVC VLRU inconsistent1"); | |
2801 | } | |
2802 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
2803 | refpanic("FindVC VLRU inconsistent1"); | |
2804 | } | |
2805 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
2806 | refpanic("FindVC VLRU inconsistent2"); | |
2807 | } | |
2808 | UpgradeSToWLock(&afs_xvcache, 26); | |
2809 | QRemove(&tvc->vlruq); | |
2810 | QAdd(&VLRU, &tvc->vlruq); | |
2811 | ConvertWToSLock(&afs_xvcache); | |
2812 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
2813 | refpanic("FindVC VLRU inconsistent1"); | |
2814 | } | |
2815 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
2816 | refpanic("FindVC VLRU inconsistent2"); | |
2817 | } | |
2818 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
2819 | refpanic("FindVC VLRU inconsistent3"); | |
2820 | } | |
2821 | } | |
2822 | vcachegen++; | |
2823 | } | |
2824 | ||
2825 | if (flag & DO_STATS) { | |
2826 | if (tvc) | |
2827 | afs_stats_cmperf.vcacheHits++; | |
2828 | else | |
2829 | afs_stats_cmperf.vcacheMisses++; | |
2830 | if (afs_IsPrimaryCellNum(afid->Cell)) | |
2831 | afs_stats_cmperf.vlocalAccesses++; | |
2832 | else | |
2833 | afs_stats_cmperf.vremoteAccesses++; | |
2834 | } | |
2835 | return tvc; | |
2836 | } /*afs_FindVCache */ | |
2837 | ||
2838 | /*! | |
2839 | * Find a vcache entry given a fid. Does a wildcard match on what we | |
2840 | * have for the fid. If more than one entry, don't return anything. | |
2841 | * | |
2842 | * \param avcp Fill in pointer if we found one and only one. | |
2843 | * \param afid Pointer to the fid whose cache entry we desire. | |
2844 | * \param retry (SGI-specific) tell the caller to drop the lock on xvcache, | |
2845 | * unlock the vnode, and try again. | |
2846 | * \param flags bit 1 to specify whether to compute hit statistics. Not | |
2847 | * set if FindVCache is called as part of internal bookkeeping. | |
2848 | * | |
2849 | * \note Environment: Must be called with the afs_xvcache lock at least held at | |
2850 | * the read level. In order to do the VLRU adjustment, the xvcache lock | |
2851 | * must be shared-- we upgrade it here. | |
2852 | * | |
2853 | * \return Number of matches found. | |
2854 | */ | |
2855 | ||
2856 | int afs_duplicate_nfs_fids = 0; | |
2857 | ||
2858 | afs_int32 | |
2859 | afs_NFSFindVCache(struct vcache **avcp, struct VenusFid *afid) | |
2860 | { | |
2861 | struct vcache *tvc; | |
2862 | afs_int32 i; | |
2863 | afs_int32 count = 0; | |
2864 | struct vcache *found_tvc = NULL; | |
2865 | #ifdef AFS_DARWIN80_ENV | |
2866 | vnode_t tvp; | |
2867 | #endif | |
2868 | ||
2869 | AFS_STATCNT(afs_FindVCache); | |
2870 | ||
2871 | loop: | |
2872 | ||
2873 | ObtainSharedLock(&afs_xvcache, 331); | |
2874 | ||
2875 | i = VCHash(afid); | |
2876 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
2877 | /* Match only on what we have.... */ | |
2878 | if (((tvc->f.fid.Fid.Vnode & 0xffff) == afid->Fid.Vnode) | |
2879 | && (tvc->f.fid.Fid.Volume == afid->Fid.Volume) | |
2880 | && ((tvc->f.fid.Fid.Unique & 0xffffff) == afid->Fid.Unique) | |
2881 | && (tvc->f.fid.Cell == afid->Cell)) { | |
2882 | if (tvc->f.states & CVInit) { | |
2883 | ReleaseSharedLock(&afs_xvcache); | |
2884 | afs_osi_Sleep(&tvc->f.states); | |
2885 | goto loop; | |
2886 | } | |
2887 | #ifdef AFS_DARWIN80_ENV | |
2888 | if (tvc->f.states & CDeadVnode) { | |
2889 | ReleaseSharedLock(&afs_xvcache); | |
2890 | afs_osi_Sleep(&tvc->f.states); | |
2891 | goto loop; | |
2892 | } | |
2893 | tvp = AFSTOV(tvc); | |
2894 | if (vnode_get(tvp)) { | |
2895 | /* This vnode no longer exists. */ | |
2896 | continue; | |
2897 | } | |
2898 | if (vnode_ref(tvp)) { | |
2899 | /* This vnode no longer exists. */ | |
2900 | AFS_GUNLOCK(); | |
2901 | /* AFSTOV(tvc) may be NULL */ | |
2902 | vnode_put(tvp); | |
2903 | AFS_GLOCK(); | |
2904 | continue; | |
2905 | } | |
2906 | #endif /* AFS_DARWIN80_ENV */ | |
2907 | count++; | |
2908 | if (found_tvc) { | |
2909 | /* Duplicates */ | |
2910 | afs_duplicate_nfs_fids++; | |
2911 | ReleaseSharedLock(&afs_xvcache); | |
2912 | #ifdef AFS_DARWIN80_ENV | |
2913 | /* Drop our reference counts. */ | |
2914 | vnode_put(AFSTOV(tvc)); | |
2915 | vnode_put(AFSTOV(found_tvc)); | |
2916 | #endif | |
2917 | return count; | |
2918 | } | |
2919 | found_tvc = tvc; | |
2920 | } | |
2921 | } | |
2922 | ||
2923 | tvc = found_tvc; | |
2924 | /* should I have a read lock on the vnode here? */ | |
2925 | if (tvc) { | |
2926 | #ifndef AFS_DARWIN80_ENV | |
2927 | #if defined(AFS_SGI_ENV) && !defined(AFS_SGI53_ENV) | |
2928 | afs_int32 retry = 0; | |
2929 | osi_vnhold(tvc, &retry); | |
2930 | if (retry) { | |
2931 | count = 0; | |
2932 | found_tvc = (struct vcache *)0; | |
2933 | ReleaseSharedLock(&afs_xvcache); | |
2934 | spunlock_psema(tvc->v.v_lock, retry, &tvc->v.v_sync, PINOD); | |
2935 | goto loop; | |
2936 | } | |
2937 | #else | |
2938 | osi_vnhold(tvc, (int *)0); /* already held, above */ | |
2939 | #endif | |
2940 | #endif | |
2941 | /* | |
2942 | * We obtained the xvcache lock above. | |
2943 | */ | |
2944 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
2945 | refpanic("FindVC VLRU inconsistent1"); | |
2946 | } | |
2947 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
2948 | refpanic("FindVC VLRU inconsistent1"); | |
2949 | } | |
2950 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
2951 | refpanic("FindVC VLRU inconsistent2"); | |
2952 | } | |
2953 | UpgradeSToWLock(&afs_xvcache, 568); | |
2954 | QRemove(&tvc->vlruq); | |
2955 | QAdd(&VLRU, &tvc->vlruq); | |
2956 | ConvertWToSLock(&afs_xvcache); | |
2957 | if ((VLRU.next->prev != &VLRU) || (VLRU.prev->next != &VLRU)) { | |
2958 | refpanic("FindVC VLRU inconsistent1"); | |
2959 | } | |
2960 | if (tvc->vlruq.next->prev != &(tvc->vlruq)) { | |
2961 | refpanic("FindVC VLRU inconsistent2"); | |
2962 | } | |
2963 | if (tvc->vlruq.prev->next != &(tvc->vlruq)) { | |
2964 | refpanic("FindVC VLRU inconsistent3"); | |
2965 | } | |
2966 | } | |
2967 | vcachegen++; | |
2968 | ||
2969 | if (tvc) | |
2970 | afs_stats_cmperf.vcacheHits++; | |
2971 | else | |
2972 | afs_stats_cmperf.vcacheMisses++; | |
2973 | if (afs_IsPrimaryCellNum(afid->Cell)) | |
2974 | afs_stats_cmperf.vlocalAccesses++; | |
2975 | else | |
2976 | afs_stats_cmperf.vremoteAccesses++; | |
2977 | ||
2978 | *avcp = tvc; /* May be null */ | |
2979 | ||
2980 | ReleaseSharedLock(&afs_xvcache); | |
2981 | return (tvc ? 1 : 0); | |
2982 | ||
2983 | } /*afs_NFSFindVCache */ | |
2984 | ||
2985 | ||
2986 | ||
2987 | ||
2988 | /*! | |
2989 | * Initialize vcache related variables | |
2990 | * | |
2991 | * \param astatSize | |
2992 | */ | |
2993 | void | |
2994 | afs_vcacheInit(int astatSize) | |
2995 | { | |
2996 | #if !defined(AFS_LINUX22_ENV) | |
2997 | struct vcache *tvp; | |
2998 | #endif | |
2999 | int i; | |
3000 | if (!afs_maxvcount) { | |
3001 | afs_maxvcount = astatSize; /* no particular limit on linux? */ | |
3002 | } | |
3003 | #if !defined(AFS_LINUX22_ENV) | |
3004 | freeVCList = NULL; | |
3005 | #endif | |
3006 | ||
3007 | AFS_RWLOCK_INIT(&afs_xvcache, "afs_xvcache"); | |
3008 | LOCK_INIT(&afs_xvcb, "afs_xvcb"); | |
3009 | ||
3010 | #if !defined(AFS_LINUX22_ENV) | |
3011 | /* Allocate and thread the struct vcache entries */ | |
3012 | tvp = afs_osi_Alloc(astatSize * sizeof(struct vcache)); | |
3013 | osi_Assert(tvp != NULL); | |
3014 | memset(tvp, 0, sizeof(struct vcache) * astatSize); | |
3015 | ||
3016 | Initial_freeVCList = tvp; | |
3017 | freeVCList = &(tvp[0]); | |
3018 | for (i = 0; i < astatSize - 1; i++) { | |
3019 | tvp[i].nextfree = &(tvp[i + 1]); | |
3020 | } | |
3021 | tvp[astatSize - 1].nextfree = NULL; | |
3022 | # ifdef KERNEL_HAVE_PIN | |
3023 | pin((char *)tvp, astatSize * sizeof(struct vcache)); /* XXX */ | |
3024 | # endif | |
3025 | #endif | |
3026 | ||
3027 | #if defined(AFS_SGI_ENV) | |
3028 | for (i = 0; i < astatSize; i++) { | |
3029 | char name[METER_NAMSZ]; | |
3030 | struct vcache *tvc = &tvp[i]; | |
3031 | ||
3032 | tvc->v.v_number = ++afsvnumbers; | |
3033 | tvc->vc_rwlockid = OSI_NO_LOCKID; | |
3034 | initnsema(&tvc->vc_rwlock, 1, | |
3035 | makesname(name, "vrw", tvc->v.v_number)); | |
3036 | #ifndef AFS_SGI53_ENV | |
3037 | initnsema(&tvc->v.v_sync, 0, makesname(name, "vsy", tvc->v.v_number)); | |
3038 | #endif | |
3039 | #ifndef AFS_SGI62_ENV | |
3040 | initnlock(&tvc->v.v_lock, makesname(name, "vlk", tvc->v.v_number)); | |
3041 | #endif /* AFS_SGI62_ENV */ | |
3042 | } | |
3043 | #endif | |
3044 | QInit(&VLRU); | |
3045 | for(i = 0; i < VCSIZE; ++i) | |
3046 | QInit(&afs_vhashTV[i]); | |
3047 | } | |
3048 | ||
3049 | /*! | |
3050 | * Shutdown vcache. | |
3051 | */ | |
3052 | void | |
3053 | shutdown_vcache(void) | |
3054 | { | |
3055 | int i; | |
3056 | struct afs_cbr *tsp; | |
3057 | /* | |
3058 | * XXX We may potentially miss some of the vcaches because if when | |
3059 | * there are no free vcache entries and all the vcache entries are active | |
3060 | * ones then we allocate an additional one - admittedly we almost never | |
3061 | * had that occur. | |
3062 | */ | |
3063 | ||
3064 | { | |
3065 | struct afs_q *tq, *uq = NULL; | |
3066 | struct vcache *tvc; | |
3067 | for (tq = VLRU.prev; tq != &VLRU; tq = uq) { | |
3068 | tvc = QTOV(tq); | |
3069 | uq = QPrev(tq); | |
3070 | if (tvc->mvid.target_root) { | |
3071 | osi_FreeSmallSpace(tvc->mvid.target_root); | |
3072 | tvc->mvid.target_root = NULL; | |
3073 | } | |
3074 | #ifdef AFS_AIX_ENV | |
3075 | aix_gnode_rele(AFSTOV(tvc)); | |
3076 | #endif | |
3077 | if (tvc->linkData) { | |
3078 | afs_osi_Free(tvc->linkData, strlen(tvc->linkData) + 1); | |
3079 | tvc->linkData = 0; | |
3080 | } | |
3081 | } | |
3082 | /* | |
3083 | * Also free the remaining ones in the Cache | |
3084 | */ | |
3085 | for (i = 0; i < VCSIZE; i++) { | |
3086 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
3087 | if (tvc->mvid.target_root) { | |
3088 | osi_FreeSmallSpace(tvc->mvid.target_root); | |
3089 | tvc->mvid.target_root = NULL; | |
3090 | } | |
3091 | #ifdef AFS_AIX_ENV | |
3092 | if (tvc->v.v_gnode) | |
3093 | afs_osi_Free(tvc->v.v_gnode, sizeof(struct gnode)); | |
3094 | #ifdef AFS_AIX32_ENV | |
3095 | if (tvc->segid) { | |
3096 | AFS_GUNLOCK(); | |
3097 | vms_delete(tvc->segid); | |
3098 | AFS_GLOCK(); | |
3099 | tvc->segid = tvc->vmh = NULL; | |
3100 | if (VREFCOUNT_GT(tvc,0)) | |
3101 | osi_Panic("flushVcache: vm race"); | |
3102 | } | |
3103 | if (tvc->credp) { | |
3104 | crfree(tvc->credp); | |
3105 | tvc->credp = NULL; | |
3106 | } | |
3107 | #endif | |
3108 | #endif | |
3109 | #if defined(AFS_SUN5_ENV) | |
3110 | if (tvc->credp) { | |
3111 | crfree(tvc->credp); | |
3112 | tvc->credp = NULL; | |
3113 | } | |
3114 | #endif | |
3115 | if (tvc->linkData) { | |
3116 | afs_osi_Free(tvc->linkData, strlen(tvc->linkData) + 1); | |
3117 | tvc->linkData = 0; | |
3118 | } | |
3119 | ||
3120 | if (tvc->Access) | |
3121 | afs_FreeAllAxs(&(tvc->Access)); | |
3122 | } | |
3123 | afs_vhashT[i] = 0; | |
3124 | } | |
3125 | } | |
3126 | /* | |
3127 | * Free any leftover callback queue | |
3128 | */ | |
3129 | for (i = 0; i < afs_stats_cmperf.CallBackAlloced; i++) { | |
3130 | tsp = afs_cbrHeads[i]; | |
3131 | afs_cbrHeads[i] = 0; | |
3132 | afs_osi_Free((char *)tsp, AFS_NCBRS * sizeof(struct afs_cbr)); | |
3133 | } | |
3134 | afs_cbrSpace = 0; | |
3135 | ||
3136 | #if !defined(AFS_LINUX22_ENV) | |
3137 | afs_osi_Free(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache)); | |
3138 | ||
3139 | # ifdef KERNEL_HAVE_PIN | |
3140 | unpin(Initial_freeVCList, afs_cacheStats * sizeof(struct vcache)); | |
3141 | # endif | |
3142 | ||
3143 | freeVCList = Initial_freeVCList = 0; | |
3144 | #endif | |
3145 | ||
3146 | AFS_RWLOCK_INIT(&afs_xvcache, "afs_xvcache"); | |
3147 | LOCK_INIT(&afs_xvcb, "afs_xvcb"); | |
3148 | QInit(&VLRU); | |
3149 | for(i = 0; i < VCSIZE; ++i) | |
3150 | QInit(&afs_vhashTV[i]); | |
3151 | } | |
3152 | ||
3153 | void | |
3154 | afs_DisconGiveUpCallbacks(void) | |
3155 | { | |
3156 | int i; | |
3157 | struct vcache *tvc; | |
3158 | int nq=0; | |
3159 | ||
3160 | ObtainWriteLock(&afs_xvcache, 1002); /* XXX - should be a unique number */ | |
3161 | ||
3162 | retry: | |
3163 | /* Somehow, walk the set of vcaches, with each one coming out as tvc */ | |
3164 | for (i = 0; i < VCSIZE; i++) { | |
3165 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
3166 | int slept = 0; | |
3167 | if (afs_QueueVCB(tvc, &slept)) { | |
3168 | tvc->callback = NULL; | |
3169 | nq++; | |
3170 | } | |
3171 | if (slept) { | |
3172 | goto retry; | |
3173 | } | |
3174 | } | |
3175 | } | |
3176 | ||
3177 | ReleaseWriteLock(&afs_xvcache); | |
3178 | ||
3179 | afs_FlushVCBs(2); | |
3180 | } | |
3181 | ||
3182 | /*! | |
3183 | * | |
3184 | * Clear the Statd flag from all vcaches | |
3185 | * | |
3186 | * This function removes the Statd flag from all vcaches. It's used by | |
3187 | * disconnected mode to tidy up during reconnection | |
3188 | * | |
3189 | */ | |
3190 | void | |
3191 | afs_ClearAllStatdFlag(void) | |
3192 | { | |
3193 | int i; | |
3194 | struct vcache *tvc; | |
3195 | ||
3196 | ObtainWriteLock(&afs_xvcache, 715); | |
3197 | ||
3198 | for (i = 0; i < VCSIZE; i++) { | |
3199 | for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) { | |
3200 | afs_StaleVCacheFlags(tvc, AFS_STALEVC_NODNLC | AFS_STALEVC_NOCB, | |
3201 | CUnique); | |
3202 | } | |
3203 | } | |
3204 | ReleaseWriteLock(&afs_xvcache); | |
3205 | } | |
3206 | ||
3207 | /** | |
3208 | * Mark a vcache as stale; our metadata for the relevant file may be out of | |
3209 | * date. | |
3210 | * | |
3211 | * @post Any subsequent access to this vcache will cause us to fetch the | |
3212 | * metadata for this vcache again. | |
3213 | */ | |
3214 | void | |
3215 | afs_StaleVCacheFlags(struct vcache *avc, afs_stalevc_flags_t flags, | |
3216 | afs_uint32 cflags) | |
3217 | { | |
3218 | int do_dnlc = 1; | |
3219 | int do_filename = 0; | |
3220 | int do_dequeue = 1; | |
3221 | int lock_cbhash = 1; | |
3222 | ||
3223 | if ((flags & AFS_STALEVC_NODNLC)) { | |
3224 | do_dnlc = 0; | |
3225 | } | |
3226 | if ((flags & AFS_STALEVC_FILENAME)) { | |
3227 | do_filename = 1; | |
3228 | } | |
3229 | if ((flags & AFS_STALEVC_CBLOCKED)) { | |
3230 | lock_cbhash = 0; | |
3231 | } | |
3232 | if ((flags & AFS_STALEVC_NOCB)) { | |
3233 | do_dequeue = 0; | |
3234 | lock_cbhash = 0; | |
3235 | } | |
3236 | ||
3237 | if (lock_cbhash) { | |
3238 | ObtainWriteLock(&afs_xcbhash, 486); | |
3239 | } | |
3240 | if (do_dequeue) { | |
3241 | afs_DequeueCallback(avc); | |
3242 | } | |
3243 | ||
3244 | cflags |= CStatd; | |
3245 | avc->f.states &= ~cflags; | |
3246 | ||
3247 | if (lock_cbhash) { | |
3248 | ReleaseWriteLock(&afs_xcbhash); | |
3249 | } | |
3250 | ||
3251 | if ((flags & AFS_STALEVC_SKIP_DNLC_FOR_INIT_FLUSHED) && | |
3252 | (avc->f.states & (CVInit | CVFlushed))) { | |
3253 | do_dnlc = 0; | |
3254 | } | |
3255 | ||
3256 | if (flags & AFS_STALEVC_CLEARCB) { | |
3257 | avc->callback = NULL; | |
3258 | } | |
3259 | ||
3260 | if (do_dnlc) { | |
3261 | if ((avc->f.fid.Fid.Vnode & 1) || | |
3262 | AFSTOV(avc) == NULL || vType(avc) == VDIR || | |
3263 | (avc->f.states & CForeign)) { | |
3264 | /* This vcache is (or could be) a directory. */ | |
3265 | osi_dnlc_purgedp(avc); | |
3266 | ||
3267 | } else if (do_filename) { | |
3268 | osi_dnlc_purgevp(avc); | |
3269 | } | |
3270 | } | |
3271 | } | |
3272 | ||
3273 | void | |
3274 | afs_SetDataVersion(struct vcache *avc, afs_hyper_t *avers) | |
3275 | { | |
3276 | hset(avc->f.m.DataVersion, *avers); | |
3277 | } |