| 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 | } |