ntoskrnl/cc/view.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/cc/view.c
   5  * PURPOSE:         Cache manager
   6  *
   7  * PROGRAMMERS:     David Welch (welch@mcmail.com)
   8  *                  Pierre Schweitzer (pierre@reactos.org)
   9  */
  10
  11 /* NOTES **********************************************************************
  12  *
  13  * This is not the NT implementation of a file cache nor anything much like
  14  * it.
  15  *
  16  * The general procedure for a filesystem to implement a read or write
  17  * dispatch routine is as follows
  18  *
  19  * (1) If caching for the FCB hasn't been initiated then so do by calling
  20  * CcInitializeFileCache.
  21  *
  22  * (2) For each 4k region which is being read or written obtain a cache page
  23  * by calling CcRequestCachePage.
  24  *
  25  * (3) If either the page is being read or not completely written, and it is
  26  * not up to date then read its data from the underlying medium. If the read
  27  * fails then call CcReleaseCachePage with VALID as FALSE and return a error.
  28  *
  29  * (4) Copy the data into or out of the page as necessary.
  30  *
  31  * (5) Release the cache page
  32  */
  33 /* INCLUDES ******************************************************************/
  34
  35 #include <ntoskrnl.h>
  36 #define NDEBUG
  37 #include <debug.h>
  38
  39 #if defined (ALLOC_PRAGMA)
  40 #pragma alloc_text(INIT, CcInitView)
  41 #endif
  42
  43 /* GLOBALS *******************************************************************/
  44
  45 LIST_ENTRY DirtyVacbListHead;
  46 static LIST_ENTRY VacbLruListHead;
  47
  48 KGUARDED_MUTEX ViewLock;
  49
  50 NPAGED_LOOKASIDE_LIST iBcbLookasideList;
  51 static NPAGED_LOOKASIDE_LIST SharedCacheMapLookasideList;
  52 static NPAGED_LOOKASIDE_LIST VacbLookasideList;
  53
  54 /* Internal vars (MS):
  55  * - Threshold above which lazy writer will start action
  56  * - Amount of dirty pages
  57  * - List for deferred writes
  58  * - Spinlock when dealing with the deferred list
  59  * - List for "clean" shared cache maps
  60  */
  61 ULONG CcDirtyPageThreshold = 0;
  62 ULONG CcTotalDirtyPages = 0;
  63 LIST_ENTRY CcDeferredWrites;
  64 KSPIN_LOCK CcDeferredWriteSpinLock;
  65 LIST_ENTRY CcCleanSharedCacheMapList;
  66
  67 #if DBG
  68 ULONG CcRosVacbIncRefCount_(PROS_VACB vacb, PCSTR file, INT line)
  69 {
  70     ULONG Refs;
  71
  72     Refs = InterlockedIncrement((PLONG)&vacb->ReferenceCount);
  73     if (vacb->SharedCacheMap->Trace)
  74     {
  75         DbgPrint("(%s:%i) VACB %p ++RefCount=%lu, Dirty %u, PageOut %lu\n",
  76                  file, line, vacb, Refs, vacb->Dirty, vacb->PageOut);
  77     }
  78
  79     return Refs;
  80 }
  81 ULONG CcRosVacbDecRefCount_(PROS_VACB vacb, PCSTR file, INT line)
  82 {
  83     ULONG Refs;
  84
  85     Refs = InterlockedDecrement((PLONG)&vacb->ReferenceCount);
  86     ASSERT(!(Refs == 0 && vacb->Dirty));
  87     if (vacb->SharedCacheMap->Trace)
  88     {
  89         DbgPrint("(%s:%i) VACB %p --RefCount=%lu, Dirty %u, PageOut %lu\n",
  90                  file, line, vacb, Refs, vacb->Dirty, vacb->PageOut);
  91     }
  92
  93     return Refs;
  94 }
  95 ULONG CcRosVacbGetRefCount_(PROS_VACB vacb, PCSTR file, INT line)
  96 {
  97     ULONG Refs;
  98
  99     Refs = InterlockedCompareExchange((PLONG)&vacb->ReferenceCount, 0, 0);
 100     if (vacb->SharedCacheMap->Trace)
 101     {
 102         DbgPrint("(%s:%i) VACB %p ==RefCount=%lu, Dirty %u, PageOut %lu\n",
 103                  file, line, vacb, Refs, vacb->Dirty, vacb->PageOut);
 104     }
 105
 106     return Refs;
 107 }
 108 #endif
 109
 110 NTSTATUS
 111 CcRosInternalFreeVacb(PROS_VACB Vacb);
 112
 113
 114 /* FUNCTIONS *****************************************************************/
 115
 116 VOID
 117 NTAPI
 118 CcRosTraceCacheMap (
 119     PROS_SHARED_CACHE_MAP SharedCacheMap,
 120     BOOLEAN Trace )
 121 {
 122 #if DBG
 123     KIRQL oldirql;
 124     PLIST_ENTRY current_entry;
 125     PROS_VACB current;
 126
 127     if (!SharedCacheMap)
 128         return;
 129
 130     SharedCacheMap->Trace = Trace;
 131
 132     if (Trace)
 133     {
 134         DPRINT1("Enabling Tracing for CacheMap 0x%p:\n", SharedCacheMap);
 135
 136         KeAcquireGuardedMutex(&ViewLock);
 137         KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldirql);
 138
 139         current_entry = SharedCacheMap->CacheMapVacbListHead.Flink;
 140         while (current_entry != &SharedCacheMap->CacheMapVacbListHead)
 141         {
 142             current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
 143             current_entry = current_entry->Flink;
 144
 145             DPRINT1("  VACB 0x%p enabled, RefCount %lu, Dirty %u, PageOut %lu\n",
 146                     current, current->ReferenceCount, current->Dirty, current->PageOut );
 147         }
 148         KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldirql);
 149         KeReleaseGuardedMutex(&ViewLock);
 150     }
 151     else
 152     {
 153         DPRINT1("Disabling Tracing for CacheMap 0x%p:\n", SharedCacheMap);
 154     }
 155
 156 #else
 157     UNREFERENCED_PARAMETER(SharedCacheMap);
 158     UNREFERENCED_PARAMETER(Trace);
 159 #endif
 160 }
 161
 162 NTSTATUS
 163 NTAPI
 164 CcRosFlushVacb (
 165     PROS_VACB Vacb)
 166 {
 167     NTSTATUS Status;
 168
 169     Status = CcWriteVirtualAddress(Vacb);
 170     if (NT_SUCCESS(Status))
 171     {
 172         CcRosUnmarkDirtyVacb(Vacb, TRUE);
 173     }
 174
 175     return Status;
 176 }
 177
 178 NTSTATUS
 179 NTAPI
 180 CcRosFlushDirtyPages (
 181     ULONG Target,
 182     PULONG Count,
 183     BOOLEAN Wait,
 184     BOOLEAN CalledFromLazy)
 185 {
 186     PLIST_ENTRY current_entry;
 187     PROS_VACB current;
 188     BOOLEAN Locked;
 189     NTSTATUS Status;
 190     LARGE_INTEGER ZeroTimeout;
 191
 192     DPRINT("CcRosFlushDirtyPages(Target %lu)\n", Target);
 193
 194     (*Count) = 0;
 195     ZeroTimeout.QuadPart = 0;
 196
 197     KeEnterCriticalRegion();
 198     KeAcquireGuardedMutex(&ViewLock);
 199
 200     current_entry = DirtyVacbListHead.Flink;
 201     if (current_entry == &DirtyVacbListHead)
 202     {
 203         DPRINT("No Dirty pages\n");
 204     }
 205
 206     while ((current_entry != &DirtyVacbListHead) && (Target > 0))
 207     {
 208         current = CONTAINING_RECORD(current_entry,
 209                                     ROS_VACB,
 210                                     DirtyVacbListEntry);
 211         current_entry = current_entry->Flink;
 212
 213         CcRosVacbIncRefCount(current);
 214
 215         /* When performing lazy write, don't handle temporary files */
 216         if (CalledFromLazy &&
 217             BooleanFlagOn(current->SharedCacheMap->FileObject->Flags, FO_TEMPORARY_FILE))
 218         {
 219             CcRosVacbDecRefCount(current);
 220             continue;
 221         }
 222
 223         Locked = current->SharedCacheMap->Callbacks->AcquireForLazyWrite(
 224                      current->SharedCacheMap->LazyWriteContext, Wait);
 225         if (!Locked)
 226         {
 227             CcRosVacbDecRefCount(current);
 228             continue;
 229         }
 230
 231         Status = CcRosAcquireVacbLock(current,
 232                                       Wait ? NULL : &ZeroTimeout);
 233         if (Status != STATUS_SUCCESS)
 234         {
 235             current->SharedCacheMap->Callbacks->ReleaseFromLazyWrite(
 236                 current->SharedCacheMap->LazyWriteContext);
 237             CcRosVacbDecRefCount(current);
 238             continue;
 239         }
 240
 241         ASSERT(current->Dirty);
 242
 243         /* One reference is added above */
 244         if (CcRosVacbGetRefCount(current) > 2)
 245         {
 246             CcRosReleaseVacbLock(current);
 247             current->SharedCacheMap->Callbacks->ReleaseFromLazyWrite(
 248                 current->SharedCacheMap->LazyWriteContext);
 249             CcRosVacbDecRefCount(current);
 250             continue;
 251         }
 252
 253         KeReleaseGuardedMutex(&ViewLock);
 254
 255         Status = CcRosFlushVacb(current);
 256
 257         CcRosReleaseVacbLock(current);
 258         current->SharedCacheMap->Callbacks->ReleaseFromLazyWrite(
 259             current->SharedCacheMap->LazyWriteContext);
 260
 261         KeAcquireGuardedMutex(&ViewLock);
 262         CcRosVacbDecRefCount(current);
 263
 264         if (!NT_SUCCESS(Status) && (Status != STATUS_END_OF_FILE) &&
 265             (Status != STATUS_MEDIA_WRITE_PROTECTED))
 266         {
 267             DPRINT1("CC: Failed to flush VACB.\n");
 268         }
 269         else
 270         {
 271             ULONG PagesFreed;
 272
 273             /* How many pages did we free? */
 274             PagesFreed = VACB_MAPPING_GRANULARITY / PAGE_SIZE;
 275             (*Count) += PagesFreed;
 276
 277             /* Make sure we don't overflow target! */
 278             if (Target < PagesFreed)
 279             {
 280                 /* If we would have, jump to zero directly */
 281                 Target = 0;
 282             }
 283             else
 284             {
 285                 Target -= PagesFreed;
 286             }
 287         }
 288
 289         current_entry = DirtyVacbListHead.Flink;
 290     }
 291
 292     KeReleaseGuardedMutex(&ViewLock);
 293     KeLeaveCriticalRegion();
 294
 295     DPRINT("CcRosFlushDirtyPages() finished\n");
 296     return STATUS_SUCCESS;
 297 }
 298
 299 NTSTATUS
 300 CcRosTrimCache (
 301     ULONG Target,
 302     ULONG Priority,
 303     PULONG NrFreed)
 304 /*
 305  * FUNCTION: Try to free some memory from the file cache.
 306  * ARGUMENTS:
 307  *       Target - The number of pages to be freed.
 308  *       Priority - The priority of free (currently unused).
 309  *       NrFreed - Points to a variable where the number of pages
 310  *                 actually freed is returned.
 311  */
 312 {
 313     PLIST_ENTRY current_entry;
 314     PROS_VACB current;
 315     ULONG PagesFreed;
 316     KIRQL oldIrql;
 317     LIST_ENTRY FreeList;
 318     PFN_NUMBER Page;
 319     ULONG i;
 320     BOOLEAN FlushedPages = FALSE;
 321
 322     DPRINT("CcRosTrimCache(Target %lu)\n", Target);
 323
 324     InitializeListHead(&FreeList);
 325
 326     *NrFreed = 0;
 327
 328 retry:
 329     KeAcquireGuardedMutex(&ViewLock);
 330
 331     current_entry = VacbLruListHead.Flink;
 332     while (current_entry != &VacbLruListHead)
 333     {
 334         ULONG Refs;
 335
 336         current = CONTAINING_RECORD(current_entry,
 337                                     ROS_VACB,
 338                                     VacbLruListEntry);
 339         current_entry = current_entry->Flink;
 340
 341         KeAcquireSpinLock(&current->SharedCacheMap->CacheMapLock, &oldIrql);
 342
 343         /* Reference the VACB */
 344         CcRosVacbIncRefCount(current);
 345
 346         /* Check if it's mapped and not dirty */
 347         if (current->MappedCount > 0 && !current->Dirty)
 348         {
 349             /* We have to break these locks because Cc sucks */
 350             KeReleaseSpinLock(&current->SharedCacheMap->CacheMapLock, oldIrql);
 351             KeReleaseGuardedMutex(&ViewLock);
 352
 353             /* Page out the VACB */
 354             for (i = 0; i < VACB_MAPPING_GRANULARITY / PAGE_SIZE; i++)
 355             {
 356                 Page = (PFN_NUMBER)(MmGetPhysicalAddress((PUCHAR)current->BaseAddress + (i * PAGE_SIZE)).QuadPart >> PAGE_SHIFT);
 357
 358                 MmPageOutPhysicalAddress(Page);
 359             }
 360
 361             /* Reacquire the locks */
 362             KeAcquireGuardedMutex(&ViewLock);
 363             KeAcquireSpinLock(&current->SharedCacheMap->CacheMapLock, &oldIrql);
 364         }
 365
 366         /* Dereference the VACB */
 367         Refs = CcRosVacbDecRefCount(current);
 368
 369         /* Check if we can free this entry now */
 370         if (Refs < 2)
 371         {
 372             ASSERT(!current->Dirty);
 373             ASSERT(!current->MappedCount);
 374             ASSERT(Refs == 1);
 375
 376             RemoveEntryList(&current->CacheMapVacbListEntry);
 377             RemoveEntryList(&current->VacbLruListEntry);
 378             InsertHeadList(&FreeList, &current->CacheMapVacbListEntry);
 379
 380             /* Calculate how many pages we freed for Mm */
 381             PagesFreed = min(VACB_MAPPING_GRANULARITY / PAGE_SIZE, Target);
 382             Target -= PagesFreed;
 383             (*NrFreed) += PagesFreed;
 384         }
 385
 386         KeReleaseSpinLock(&current->SharedCacheMap->CacheMapLock, oldIrql);
 387     }
 388
 389     KeReleaseGuardedMutex(&ViewLock);
 390
 391     /* Try flushing pages if we haven't met our target */
 392     if ((Target > 0) && !FlushedPages)
 393     {
 394         /* Flush dirty pages to disk */
 395         CcRosFlushDirtyPages(Target, &PagesFreed, FALSE, FALSE);
 396         FlushedPages = TRUE;
 397
 398         /* We can only swap as many pages as we flushed */
 399         if (PagesFreed < Target) Target = PagesFreed;
 400
 401         /* Check if we flushed anything */
 402         if (PagesFreed != 0)
 403         {
 404             /* Try again after flushing dirty pages */
 405             DPRINT("Flushed %lu dirty cache pages to disk\n", PagesFreed);
 406             goto retry;
 407         }
 408     }
 409
 410     while (!IsListEmpty(&FreeList))
 411     {
 412         current_entry = RemoveHeadList(&FreeList);
 413         current = CONTAINING_RECORD(current_entry,
 414                                     ROS_VACB,
 415                                     CacheMapVacbListEntry);
 416         CcRosVacbDecRefCount(current);
 417         CcRosInternalFreeVacb(current);
 418     }
 419
 420     DPRINT("Evicted %lu cache pages\n", (*NrFreed));
 421
 422     return STATUS_SUCCESS;
 423 }
 424
 425 NTSTATUS
 426 NTAPI
 427 CcRosReleaseVacb (
 428     PROS_SHARED_CACHE_MAP SharedCacheMap,
 429     PROS_VACB Vacb,
 430     BOOLEAN Valid,
 431     BOOLEAN Dirty,
 432     BOOLEAN Mapped)
 433 {
 434     ULONG Refs;
 435     ASSERT(SharedCacheMap);
 436
 437     DPRINT("CcRosReleaseVacb(SharedCacheMap 0x%p, Vacb 0x%p, Valid %u)\n",
 438            SharedCacheMap, Vacb, Valid);
 439
 440     Vacb->Valid = Valid;
 441
 442     if (Dirty && !Vacb->Dirty)
 443     {
 444         CcRosMarkDirtyVacb(Vacb);
 445     }
 446
 447     if (Mapped)
 448     {
 449         Vacb->MappedCount++;
 450     }
 451     Refs = CcRosVacbDecRefCount(Vacb);
 452     if (Mapped && (Vacb->MappedCount == 1))
 453     {
 454         CcRosVacbIncRefCount(Vacb);
 455     }
 456
 457     ASSERT(Refs > 0);
 458
 459     CcRosReleaseVacbLock(Vacb);
 460
 461     return STATUS_SUCCESS;
 462 }
 463
 464 /* Returns with VACB Lock Held! */
 465 PROS_VACB
 466 NTAPI
 467 CcRosLookupVacb (
 468     PROS_SHARED_CACHE_MAP SharedCacheMap,
 469     LONGLONG FileOffset)
 470 {
 471     PLIST_ENTRY current_entry;
 472     PROS_VACB current;
 473     KIRQL oldIrql;
 474
 475     ASSERT(SharedCacheMap);
 476
 477     DPRINT("CcRosLookupVacb(SharedCacheMap 0x%p, FileOffset %I64u)\n",
 478            SharedCacheMap, FileOffset);
 479
 480     KeAcquireGuardedMutex(&ViewLock);
 481     KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
 482
 483     current_entry = SharedCacheMap->CacheMapVacbListHead.Flink;
 484     while (current_entry != &SharedCacheMap->CacheMapVacbListHead)
 485     {
 486         current = CONTAINING_RECORD(current_entry,
 487                                     ROS_VACB,
 488                                     CacheMapVacbListEntry);
 489         if (IsPointInRange(current->FileOffset.QuadPart,
 490                            VACB_MAPPING_GRANULARITY,
 491                            FileOffset))
 492         {
 493             CcRosVacbIncRefCount(current);
 494             KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
 495             KeReleaseGuardedMutex(&ViewLock);
 496             CcRosAcquireVacbLock(current, NULL);
 497             return current;
 498         }
 499         if (current->FileOffset.QuadPart > FileOffset)
 500             break;
 501         current_entry = current_entry->Flink;
 502     }
 503
 504     KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
 505     KeReleaseGuardedMutex(&ViewLock);
 506
 507     return NULL;
 508 }
 509
 510 VOID
 511 NTAPI
 512 CcRosMarkDirtyVacb (
 513     PROS_VACB Vacb)
 514 {
 515     KIRQL oldIrql;
 516     PROS_SHARED_CACHE_MAP SharedCacheMap;
 517
 518     SharedCacheMap = Vacb->SharedCacheMap;
 519
 520     KeAcquireGuardedMutex(&ViewLock);
 521     KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
 522
 523     ASSERT(!Vacb->Dirty);
 524
 525     InsertTailList(&DirtyVacbListHead, &Vacb->DirtyVacbListEntry);
 526     CcTotalDirtyPages += VACB_MAPPING_GRANULARITY / PAGE_SIZE;
 527     Vacb->SharedCacheMap->DirtyPages += VACB_MAPPING_GRANULARITY / PAGE_SIZE;
 528     CcRosVacbIncRefCount(Vacb);
 529
 530     /* Move to the tail of the LRU list */
 531     RemoveEntryList(&Vacb->VacbLruListEntry);
 532     InsertTailList(&VacbLruListHead, &Vacb->VacbLruListEntry);
 533
 534     Vacb->Dirty = TRUE;
 535
 536     KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
 537     KeReleaseGuardedMutex(&ViewLock);
 538
 539     /* Schedule a lazy writer run to now that we have dirty VACB */
 540     oldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
 541     if (!LazyWriter.ScanActive)
 542     {
 543         CcScheduleLazyWriteScan(FALSE);
 544     }
 545     KeReleaseQueuedSpinLock(LockQueueMasterLock, oldIrql);
 546 }
 547
 548 VOID
 549 NTAPI
 550 CcRosUnmarkDirtyVacb (
 551     PROS_VACB Vacb,
 552     BOOLEAN LockViews)
 553 {
 554     KIRQL oldIrql;
 555     PROS_SHARED_CACHE_MAP SharedCacheMap;
 556
 557     SharedCacheMap = Vacb->SharedCacheMap;
 558
 559     if (LockViews)
 560     {
 561         KeAcquireGuardedMutex(&ViewLock);
 562         KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
 563     }
 564
 565     ASSERT(Vacb->Dirty);
 566
 567     Vacb->Dirty = FALSE;
 568
 569     RemoveEntryList(&Vacb->DirtyVacbListEntry);
 570     CcTotalDirtyPages -= VACB_MAPPING_GRANULARITY / PAGE_SIZE;
 571     Vacb->SharedCacheMap->DirtyPages -= VACB_MAPPING_GRANULARITY / PAGE_SIZE;
 572     CcRosVacbDecRefCount(Vacb);
 573
 574     if (LockViews)
 575     {
 576         KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
 577         KeReleaseGuardedMutex(&ViewLock);
 578     }
 579 }
 580
 581 NTSTATUS
 582 NTAPI
 583 CcRosMarkDirtyFile (
 584     PROS_SHARED_CACHE_MAP SharedCacheMap,
 585     LONGLONG FileOffset)
 586 {
 587     PROS_VACB Vacb;
 588
 589     ASSERT(SharedCacheMap);
 590
 591     DPRINT("CcRosMarkDirtyVacb(SharedCacheMap 0x%p, FileOffset %I64u)\n",
 592            SharedCacheMap, FileOffset);
 593
 594     Vacb = CcRosLookupVacb(SharedCacheMap, FileOffset);
 595     if (Vacb == NULL)
 596     {
 597         KeBugCheck(CACHE_MANAGER);
 598     }
 599
 600     CcRosReleaseVacb(SharedCacheMap, Vacb, Vacb->Valid, TRUE, FALSE);
 601
 602     return STATUS_SUCCESS;
 603 }
 604
 605 /*
 606  * Note: this is not the contrary function of
 607  * CcRosMapVacbInKernelSpace()
 608  */
 609 NTSTATUS
 610 NTAPI
 611 CcRosUnmapVacb (
 612     PROS_SHARED_CACHE_MAP SharedCacheMap,
 613     LONGLONG FileOffset,
 614     BOOLEAN NowDirty)
 615 {
 616     PROS_VACB Vacb;
 617
 618     ASSERT(SharedCacheMap);
 619
 620     DPRINT("CcRosUnmapVacb(SharedCacheMap 0x%p, FileOffset %I64u, NowDirty %u)\n",
 621            SharedCacheMap, FileOffset, NowDirty);
 622
 623     Vacb = CcRosLookupVacb(SharedCacheMap, FileOffset);
 624     if (Vacb == NULL)
 625     {
 626         return STATUS_UNSUCCESSFUL;
 627     }
 628
 629     ASSERT(Vacb->MappedCount != 0);
 630     Vacb->MappedCount--;
 631
 632     if (Vacb->MappedCount == 0)
 633     {
 634         CcRosVacbDecRefCount(Vacb);
 635     }
 636
 637     CcRosReleaseVacb(SharedCacheMap, Vacb, Vacb->Valid, NowDirty, FALSE);
 638
 639     return STATUS_SUCCESS;
 640 }
 641
 642 static
 643 NTSTATUS
 644 CcRosMapVacbInKernelSpace(
 645     PROS_VACB Vacb)
 646 {
 647     ULONG i;
 648     NTSTATUS Status;
 649     ULONG_PTR NumberOfPages;
 650     PVOID BaseAddress = NULL;
 651
 652     /* Create a memory area. */
 653     MmLockAddressSpace(MmGetKernelAddressSpace());
 654     Status = MmCreateMemoryArea(MmGetKernelAddressSpace(),
 655                                 0, // nothing checks for VACB mareas, so set to 0
 656                                 &BaseAddress,
 657                                 VACB_MAPPING_GRANULARITY,
 658                                 PAGE_READWRITE,
 659                                 (PMEMORY_AREA*)&Vacb->MemoryArea,
 660                                 0,
 661                                 PAGE_SIZE);
 662     ASSERT(Vacb->BaseAddress == NULL);
 663     Vacb->BaseAddress = BaseAddress;
 664     MmUnlockAddressSpace(MmGetKernelAddressSpace());
 665     if (!NT_SUCCESS(Status))
 666     {
 667         DPRINT1("MmCreateMemoryArea failed with %lx for VACB %p\n", Status, Vacb);
 668         return Status;
 669     }
 670
 671     ASSERT(((ULONG_PTR)Vacb->BaseAddress % PAGE_SIZE) == 0);
 672     ASSERT((ULONG_PTR)Vacb->BaseAddress > (ULONG_PTR)MmSystemRangeStart);
 673     ASSERT((ULONG_PTR)Vacb->BaseAddress + VACB_MAPPING_GRANULARITY - 1 > (ULONG_PTR)MmSystemRangeStart);
 674
 675     /* Create a virtual mapping for this memory area */
 676     NumberOfPages = BYTES_TO_PAGES(VACB_MAPPING_GRANULARITY);
 677     for (i = 0; i < NumberOfPages; i++)
 678     {
 679         PFN_NUMBER PageFrameNumber;
 680
 681         MI_SET_USAGE(MI_USAGE_CACHE);
 682         Status = MmRequestPageMemoryConsumer(MC_CACHE, TRUE, &PageFrameNumber);
 683         if (PageFrameNumber == 0)
 684         {
 685             DPRINT1("Unable to allocate page\n");
 686             KeBugCheck(MEMORY_MANAGEMENT);
 687         }
 688
 689         ASSERT(BaseAddress == Vacb->BaseAddress);
 690         ASSERT(i * PAGE_SIZE < VACB_MAPPING_GRANULARITY);
 691         ASSERT((ULONG_PTR)Vacb->BaseAddress + (i * PAGE_SIZE) >= (ULONG_PTR)BaseAddress);
 692         ASSERT((ULONG_PTR)Vacb->BaseAddress + (i * PAGE_SIZE) > (ULONG_PTR)MmSystemRangeStart);
 693
 694         Status = MmCreateVirtualMapping(NULL,
 695                                         (PVOID)((ULONG_PTR)Vacb->BaseAddress + (i * PAGE_SIZE)),
 696                                         PAGE_READWRITE,
 697                                         &PageFrameNumber,
 698                                         1);
 699         if (!NT_SUCCESS(Status))
 700         {
 701             DPRINT1("Unable to create virtual mapping\n");
 702             KeBugCheck(MEMORY_MANAGEMENT);
 703         }
 704     }
 705
 706     return STATUS_SUCCESS;
 707 }
 708
 709 static
 710 NTSTATUS
 711 CcRosCreateVacb (
 712     PROS_SHARED_CACHE_MAP SharedCacheMap,
 713     LONGLONG FileOffset,
 714     PROS_VACB *Vacb)
 715 {
 716     PROS_VACB current;
 717     PROS_VACB previous;
 718     PLIST_ENTRY current_entry;
 719     NTSTATUS Status;
 720     KIRQL oldIrql;
 721
 722     ASSERT(SharedCacheMap);
 723
 724     DPRINT("CcRosCreateVacb()\n");
 725
 726     if (FileOffset >= SharedCacheMap->SectionSize.QuadPart)
 727     {
 728         *Vacb = NULL;
 729         return STATUS_INVALID_PARAMETER;
 730     }
 731
 732     current = ExAllocateFromNPagedLookasideList(&VacbLookasideList);
 733     current->BaseAddress = NULL;
 734     current->Valid = FALSE;
 735     current->Dirty = FALSE;
 736     current->PageOut = FALSE;
 737     current->FileOffset.QuadPart = ROUND_DOWN(FileOffset, VACB_MAPPING_GRANULARITY);
 738     current->SharedCacheMap = SharedCacheMap;
 739 #if DBG
 740     if (SharedCacheMap->Trace)
 741     {
 742         DPRINT1("CacheMap 0x%p: new VACB: 0x%p\n", SharedCacheMap, current);
 743     }
 744 #endif
 745     current->MappedCount = 0;
 746     current->DirtyVacbListEntry.Flink = NULL;
 747     current->DirtyVacbListEntry.Blink = NULL;
 748     current->ReferenceCount = 0;
 749     current->PinCount = 0;
 750     KeInitializeMutex(&current->Mutex, 0);
 751     CcRosAcquireVacbLock(current, NULL);
 752     KeAcquireGuardedMutex(&ViewLock);
 753
 754     *Vacb = current;
 755     /* There is window between the call to CcRosLookupVacb
 756      * and CcRosCreateVacb. We must check if a VACB for the
 757      * file offset exist. If there is a VACB, we release
 758      * our newly created VACB and return the existing one.
 759      */
 760     KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
 761     current_entry = SharedCacheMap->CacheMapVacbListHead.Flink;
 762     previous = NULL;
 763     while (current_entry != &SharedCacheMap->CacheMapVacbListHead)
 764     {
 765         current = CONTAINING_RECORD(current_entry,
 766                                     ROS_VACB,
 767                                     CacheMapVacbListEntry);
 768         if (IsPointInRange(current->FileOffset.QuadPart,
 769                            VACB_MAPPING_GRANULARITY,
 770                            FileOffset))
 771         {
 772             CcRosVacbIncRefCount(current);
 773             KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
 774 #if DBG
 775             if (SharedCacheMap->Trace)
 776             {
 777                 DPRINT1("CacheMap 0x%p: deleting newly created VACB 0x%p ( found existing one 0x%p )\n",
 778                         SharedCacheMap,
 779                         (*Vacb),
 780                         current);
 781             }
 782 #endif
 783             CcRosReleaseVacbLock(*Vacb);
 784             KeReleaseGuardedMutex(&ViewLock);
 785             ExFreeToNPagedLookasideList(&VacbLookasideList, *Vacb);
 786             *Vacb = current;
 787             CcRosAcquireVacbLock(current, NULL);
 788             return STATUS_SUCCESS;
 789         }
 790         if (current->FileOffset.QuadPart < FileOffset)
 791         {
 792             ASSERT(previous == NULL ||
 793                    previous->FileOffset.QuadPart < current->FileOffset.QuadPart);
 794             previous = current;
 795         }
 796         if (current->FileOffset.QuadPart > FileOffset)
 797             break;
 798         current_entry = current_entry->Flink;
 799     }
 800     /* There was no existing VACB. */
 801     current = *Vacb;
 802     if (previous)
 803     {
 804         InsertHeadList(&previous->CacheMapVacbListEntry, &current->CacheMapVacbListEntry);
 805     }
 806     else
 807     {
 808         InsertHeadList(&SharedCacheMap->CacheMapVacbListHead, &current->CacheMapVacbListEntry);
 809     }
 810     KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
 811     InsertTailList(&VacbLruListHead, &current->VacbLruListEntry);
 812     CcRosVacbIncRefCount(current);
 813     KeReleaseGuardedMutex(&ViewLock);
 814
 815     MI_SET_USAGE(MI_USAGE_CACHE);
 816 #if MI_TRACE_PFNS
 817     if ((SharedCacheMap->FileObject) && (SharedCacheMap->FileObject->FileName.Buffer))
 818     {
 819         PWCHAR pos;
 820         ULONG len = 0;
 821         pos = wcsrchr(SharedCacheMap->FileObject->FileName.Buffer, '\\');
 822         if (pos)
 823         {
 824             len = wcslen(pos) * sizeof(WCHAR);
 825             snprintf(MI_PFN_CURRENT_PROCESS_NAME, min(16, len), "%S", pos);
 826         }
 827         else
 828         {
 829             snprintf(MI_PFN_CURRENT_PROCESS_NAME, min(16, len), "%wZ", &SharedCacheMap->FileObject->FileName);
 830         }
 831     }
 832 #endif
 833
 834     Status = CcRosMapVacbInKernelSpace(current);
 835     if (!NT_SUCCESS(Status))
 836     {
 837         RemoveEntryList(&current->CacheMapVacbListEntry);
 838         RemoveEntryList(&current->VacbLruListEntry);
 839         CcRosReleaseVacbLock(current);
 840         ExFreeToNPagedLookasideList(&VacbLookasideList, current);
 841     }
 842
 843     /* Reference it to allow release */
 844     CcRosVacbIncRefCount(current);
 845
 846     return Status;
 847 }
 848
 849 NTSTATUS
 850 NTAPI
 851 CcRosGetVacb (
 852     PROS_SHARED_CACHE_MAP SharedCacheMap,
 853     LONGLONG FileOffset,
 854     PLONGLONG BaseOffset,
 855     PVOID* BaseAddress,
 856     PBOOLEAN UptoDate,
 857     PROS_VACB *Vacb)
 858 {
 859     PROS_VACB current;
 860     NTSTATUS Status;
 861     ULONG Refs;
 862
 863     ASSERT(SharedCacheMap);
 864
 865     DPRINT("CcRosGetVacb()\n");
 866
 867     /*
 868      * Look for a VACB already mapping the same data.
 869      */
 870     current = CcRosLookupVacb(SharedCacheMap, FileOffset);
 871     if (current == NULL)
 872     {
 873         /*
 874          * Otherwise create a new VACB.
 875          */
 876         Status = CcRosCreateVacb(SharedCacheMap, FileOffset, &current);
 877         if (!NT_SUCCESS(Status))
 878         {
 879             return Status;
 880         }
 881     }
 882
 883     Refs = CcRosVacbGetRefCount(current);
 884
 885     KeAcquireGuardedMutex(&ViewLock);
 886
 887     /* Move to the tail of the LRU list */
 888     RemoveEntryList(&current->VacbLruListEntry);
 889     InsertTailList(&VacbLruListHead, &current->VacbLruListEntry);
 890
 891     KeReleaseGuardedMutex(&ViewLock);
 892
 893     /*
 894      * Return information about the VACB to the caller.
 895      */
 896     *UptoDate = current->Valid;
 897     *BaseAddress = current->BaseAddress;
 898     DPRINT("*BaseAddress %p\n", *BaseAddress);
 899     *Vacb = current;
 900     *BaseOffset = current->FileOffset.QuadPart;
 901
 902     ASSERT(Refs > 1);
 903
 904     return STATUS_SUCCESS;
 905 }
 906
 907 NTSTATUS
 908 NTAPI
 909 CcRosRequestVacb (
 910     PROS_SHARED_CACHE_MAP SharedCacheMap,
 911     LONGLONG FileOffset,
 912     PVOID* BaseAddress,
 913     PBOOLEAN UptoDate,
 914     PROS_VACB *Vacb)
 915 /*
 916  * FUNCTION: Request a page mapping for a shared cache map
 917  */
 918 {
 919     LONGLONG BaseOffset;
 920
 921     ASSERT(SharedCacheMap);
 922
 923     if (FileOffset % VACB_MAPPING_GRANULARITY != 0)
 924     {
 925         DPRINT1("Bad fileoffset %I64x should be multiple of %x",
 926                 FileOffset, VACB_MAPPING_GRANULARITY);
 927         KeBugCheck(CACHE_MANAGER);
 928     }
 929
 930     return CcRosGetVacb(SharedCacheMap,
 931                         FileOffset,
 932                         &BaseOffset,
 933                         BaseAddress,
 934                         UptoDate,
 935                         Vacb);
 936 }
 937
 938 static
 939 VOID
 940 CcFreeCachePage (
 941     PVOID Context,
 942     MEMORY_AREA* MemoryArea,
 943     PVOID Address,
 944     PFN_NUMBER Page,
 945     SWAPENTRY SwapEntry,
 946     BOOLEAN Dirty)
 947 {
 948     ASSERT(SwapEntry == 0);
 949     if (Page != 0)
 950     {
 951         ASSERT(MmGetReferenceCountPage(Page) == 1);
 952         MmReleasePageMemoryConsumer(MC_CACHE, Page);
 953     }
 954 }
 955
 956 NTSTATUS
 957 CcRosInternalFreeVacb (
 958     PROS_VACB Vacb)
 959 /*
 960  * FUNCTION: Releases a VACB associated with a shared cache map
 961  */
 962 {
 963     DPRINT("Freeing VACB 0x%p\n", Vacb);
 964 #if DBG
 965     if (Vacb->SharedCacheMap->Trace)
 966     {
 967         DPRINT1("CacheMap 0x%p: deleting VACB: 0x%p\n", Vacb->SharedCacheMap, Vacb);
 968     }
 969 #endif
 970
 971     MmLockAddressSpace(MmGetKernelAddressSpace());
 972     MmFreeMemoryArea(MmGetKernelAddressSpace(),
 973                      Vacb->MemoryArea,
 974                      CcFreeCachePage,
 975                      NULL);
 976     MmUnlockAddressSpace(MmGetKernelAddressSpace());
 977
 978     if (Vacb->PinCount != 0 || Vacb->ReferenceCount != 0)
 979     {
 980         DPRINT1("Invalid free: %ld, %ld\n", Vacb->ReferenceCount, Vacb->PinCount);
 981         if (Vacb->SharedCacheMap->FileObject && Vacb->SharedCacheMap->FileObject->FileName.Length)
 982         {
 983             DPRINT1("For file: %wZ\n", &Vacb->SharedCacheMap->FileObject->FileName);
 984         }
 985     }
 986
 987     ASSERT(Vacb->PinCount == 0);
 988     ASSERT(Vacb->ReferenceCount == 0);
 989     RtlFillMemory(Vacb, sizeof(Vacb), 0xfd);
 990     ExFreeToNPagedLookasideList(&VacbLookasideList, Vacb);
 991     return STATUS_SUCCESS;
 992 }
 993
 994 /*
 995  * @implemented
 996  */
 997 VOID
 998 NTAPI
 999 CcFlushCache (
1000     IN PSECTION_OBJECT_POINTERS SectionObjectPointers,
1001     IN PLARGE_INTEGER FileOffset OPTIONAL,
1002     IN ULONG Length,
1003     OUT PIO_STATUS_BLOCK IoStatus)
1004 {
1005     PROS_SHARED_CACHE_MAP SharedCacheMap;
1006     LARGE_INTEGER Offset;
1007     LONGLONG RemainingLength;
1008     PROS_VACB current;
1009     NTSTATUS Status;
1010
1011     CCTRACE(CC_API_DEBUG, "SectionObjectPointers=%p FileOffset=%p Length=%lu\n",
1012         SectionObjectPointers, FileOffset, Length);
1013
1014     DPRINT("CcFlushCache(SectionObjectPointers 0x%p, FileOffset 0x%p, Length %lu, IoStatus 0x%p)\n",
1015            SectionObjectPointers, FileOffset, Length, IoStatus);
1016
1017     if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
1018     {
1019         SharedCacheMap = SectionObjectPointers->SharedCacheMap;
1020         ASSERT(SharedCacheMap);
1021         if (FileOffset)
1022         {
1023             Offset = *FileOffset;
1024             RemainingLength = Length;
1025         }
1026         else
1027         {
1028             Offset.QuadPart = 0;
1029             RemainingLength = SharedCacheMap->FileSize.QuadPart;
1030         }
1031
1032         if (IoStatus)
1033         {
1034             IoStatus->Status = STATUS_SUCCESS;
1035             IoStatus->Information = 0;
1036         }
1037
1038         while (RemainingLength > 0)
1039         {
1040             current = CcRosLookupVacb(SharedCacheMap, Offset.QuadPart);
1041             if (current != NULL)
1042             {
1043                 if (current->Dirty)
1044                 {
1045                     Status = CcRosFlushVacb(current);
1046                     if (!NT_SUCCESS(Status) && IoStatus != NULL)
1047                     {
1048                         IoStatus->Status = Status;
1049                     }
1050                 }
1051
1052                 CcRosReleaseVacb(SharedCacheMap, current, current->Valid, current->Dirty, FALSE);
1053             }
1054
1055             Offset.QuadPart += VACB_MAPPING_GRANULARITY;
1056             RemainingLength -= min(RemainingLength, VACB_MAPPING_GRANULARITY);
1057         }
1058     }
1059     else
1060     {
1061         if (IoStatus)
1062         {
1063             IoStatus->Status = STATUS_INVALID_PARAMETER;
1064         }
1065     }
1066 }
1067
1068 NTSTATUS
1069 NTAPI
1070 CcRosDeleteFileCache (
1071     PFILE_OBJECT FileObject,
1072     PROS_SHARED_CACHE_MAP SharedCacheMap)
1073 /*
1074  * FUNCTION: Releases the shared cache map associated with a file object
1075  */
1076 {
1077     PLIST_ENTRY current_entry;
1078     PROS_VACB current;
1079     LIST_ENTRY FreeList;
1080     KIRQL oldIrql;
1081
1082     ASSERT(SharedCacheMap);
1083
1084     SharedCacheMap->OpenCount++;
1085     KeReleaseGuardedMutex(&ViewLock);
1086
1087     CcFlushCache(FileObject->SectionObjectPointer, NULL, 0, NULL);
1088
1089     KeAcquireGuardedMutex(&ViewLock);
1090     SharedCacheMap->OpenCount--;
1091     if (SharedCacheMap->OpenCount == 0)
1092     {
1093         KIRQL OldIrql;
1094
1095         FileObject->SectionObjectPointer->SharedCacheMap = NULL;
1096
1097         /*
1098          * Release all VACBs
1099          */
1100         InitializeListHead(&FreeList);
1101         KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
1102         while (!IsListEmpty(&SharedCacheMap->CacheMapVacbListHead))
1103         {
1104             current_entry = RemoveTailList(&SharedCacheMap->CacheMapVacbListHead);
1105             KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
1106
1107             current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
1108             CcRosAcquireVacbLock(current, NULL);
1109             RemoveEntryList(&current->VacbLruListEntry);
1110             if (current->Dirty)
1111             {
1112                 KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
1113                 CcRosUnmarkDirtyVacb(current, FALSE);
1114                 KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
1115                 DPRINT1("Freeing dirty VACB\n");
1116             }
1117             InsertHeadList(&FreeList, &current->CacheMapVacbListEntry);
1118             CcRosReleaseVacbLock(current);
1119
1120             KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
1121         }
1122 #if DBG
1123         SharedCacheMap->Trace = FALSE;
1124 #endif
1125         KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
1126
1127         KeReleaseGuardedMutex(&ViewLock);
1128         ObDereferenceObject(SharedCacheMap->FileObject);
1129
1130         while (!IsListEmpty(&FreeList))
1131         {
1132             current_entry = RemoveTailList(&FreeList);
1133             current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
1134             CcRosVacbDecRefCount(current);
1135             CcRosInternalFreeVacb(current);
1136         }
1137
1138         OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
1139         RemoveEntryList(&SharedCacheMap->SharedCacheMapLinks);
1140         KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
1141
1142         ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList, SharedCacheMap);
1143         KeAcquireGuardedMutex(&ViewLock);
1144     }
1145     return STATUS_SUCCESS;
1146 }
1147
1148 VOID
1149 NTAPI
1150 CcRosReferenceCache (
1151     PFILE_OBJECT FileObject)
1152 {
1153     PROS_SHARED_CACHE_MAP SharedCacheMap;
1154     KeAcquireGuardedMutex(&ViewLock);
1155     SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
1156     ASSERT(SharedCacheMap);
1157     ASSERT(SharedCacheMap->OpenCount != 0);
1158     SharedCacheMap->OpenCount++;
1159     KeReleaseGuardedMutex(&ViewLock);
1160 }
1161
1162 VOID
1163 NTAPI
1164 CcRosRemoveIfClosed (
1165     PSECTION_OBJECT_POINTERS SectionObjectPointer)
1166 {
1167     PROS_SHARED_CACHE_MAP SharedCacheMap;
1168     DPRINT("CcRosRemoveIfClosed()\n");
1169     KeAcquireGuardedMutex(&ViewLock);
1170     SharedCacheMap = SectionObjectPointer->SharedCacheMap;
1171     if (SharedCacheMap && SharedCacheMap->OpenCount == 0)
1172     {
1173         CcRosDeleteFileCache(SharedCacheMap->FileObject, SharedCacheMap);
1174     }
1175     KeReleaseGuardedMutex(&ViewLock);
1176 }
1177
1178
1179 VOID
1180 NTAPI
1181 CcRosDereferenceCache (
1182     PFILE_OBJECT FileObject)
1183 {
1184     PROS_SHARED_CACHE_MAP SharedCacheMap;
1185     KeAcquireGuardedMutex(&ViewLock);
1186     SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
1187     ASSERT(SharedCacheMap);
1188     if (SharedCacheMap->OpenCount > 0)
1189     {
1190         SharedCacheMap->OpenCount--;
1191         if (SharedCacheMap->OpenCount == 0)
1192         {
1193             MmFreeSectionSegments(SharedCacheMap->FileObject);
1194             CcRosDeleteFileCache(FileObject, SharedCacheMap);
1195         }
1196     }
1197     KeReleaseGuardedMutex(&ViewLock);
1198 }
1199
1200 NTSTATUS
1201 NTAPI
1202 CcRosReleaseFileCache (
1203     PFILE_OBJECT FileObject)
1204 /*
1205  * FUNCTION: Called by the file system when a handle to a file object
1206  * has been closed.
1207  */
1208 {
1209     KIRQL OldIrql;
1210     PPRIVATE_CACHE_MAP PrivateMap;
1211     PROS_SHARED_CACHE_MAP SharedCacheMap;
1212
1213     KeAcquireGuardedMutex(&ViewLock);
1214
1215     if (FileObject->SectionObjectPointer->SharedCacheMap != NULL)
1216     {
1217         SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
1218
1219         /* Closing the handle, so kill the private cache map
1220          * Before you event try to remove it from FO, always
1221          * lock the master lock, to be sure not to race
1222          * with a potential read ahead ongoing!
1223          */
1224         OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
1225         PrivateMap = FileObject->PrivateCacheMap;
1226         FileObject->PrivateCacheMap = NULL;
1227         KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
1228
1229         if (PrivateMap != NULL)
1230         {
1231             /* Remove it from the file */
1232             KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &OldIrql);
1233             RemoveEntryList(&PrivateMap->PrivateLinks);
1234             KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, OldIrql);
1235
1236             /* And free it. */
1237             if (PrivateMap != &SharedCacheMap->PrivateCacheMap)
1238             {
1239                 ExFreePoolWithTag(PrivateMap, TAG_PRIVATE_CACHE_MAP);
1240             }
1241             else
1242             {
1243                 PrivateMap->NodeTypeCode = 0;
1244             }
1245
1246             if (SharedCacheMap->OpenCount > 0)
1247             {
1248                 SharedCacheMap->OpenCount--;
1249                 if (SharedCacheMap->OpenCount == 0)
1250                 {
1251                     MmFreeSectionSegments(SharedCacheMap->FileObject);
1252                     CcRosDeleteFileCache(FileObject, SharedCacheMap);
1253                 }
1254             }
1255         }
1256     }
1257     KeReleaseGuardedMutex(&ViewLock);
1258     return STATUS_SUCCESS;
1259 }
1260
1261 NTSTATUS
1262 NTAPI
1263 CcRosInitializeFileCache (
1264     PFILE_OBJECT FileObject,
1265     PCC_FILE_SIZES FileSizes,
1266     BOOLEAN PinAccess,
1267     PCACHE_MANAGER_CALLBACKS CallBacks,
1268     PVOID LazyWriterContext)
1269 /*
1270  * FUNCTION: Initializes a shared cache map for a file object
1271  */
1272 {
1273     KIRQL OldIrql;
1274     BOOLEAN Allocated;
1275     PROS_SHARED_CACHE_MAP SharedCacheMap;
1276
1277     SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
1278     DPRINT("CcRosInitializeFileCache(FileObject 0x%p, SharedCacheMap 0x%p)\n",
1279            FileObject, SharedCacheMap);
1280
1281     Allocated = FALSE;
1282     KeAcquireGuardedMutex(&ViewLock);
1283     if (SharedCacheMap == NULL)
1284     {
1285         Allocated = TRUE;
1286         SharedCacheMap = ExAllocateFromNPagedLookasideList(&SharedCacheMapLookasideList);
1287         if (SharedCacheMap == NULL)
1288         {
1289             KeReleaseGuardedMutex(&ViewLock);
1290             return STATUS_INSUFFICIENT_RESOURCES;
1291         }
1292         RtlZeroMemory(SharedCacheMap, sizeof(*SharedCacheMap));
1293         ObReferenceObjectByPointer(FileObject,
1294                                    FILE_ALL_ACCESS,
1295                                    NULL,
1296                                    KernelMode);
1297         SharedCacheMap->NodeTypeCode = NODE_TYPE_SHARED_MAP;
1298         SharedCacheMap->NodeByteSize = sizeof(*SharedCacheMap);
1299         SharedCacheMap->FileObject = FileObject;
1300         SharedCacheMap->Callbacks = CallBacks;
1301         SharedCacheMap->LazyWriteContext = LazyWriterContext;
1302         SharedCacheMap->SectionSize = FileSizes->AllocationSize;
1303         SharedCacheMap->FileSize = FileSizes->FileSize;
1304         SharedCacheMap->PinAccess = PinAccess;
1305         SharedCacheMap->DirtyPageThreshold = 0;
1306         SharedCacheMap->DirtyPages = 0;
1307         InitializeListHead(&SharedCacheMap->PrivateList);
1308         KeInitializeSpinLock(&SharedCacheMap->CacheMapLock);
1309         InitializeListHead(&SharedCacheMap->CacheMapVacbListHead);
1310         FileObject->SectionObjectPointer->SharedCacheMap = SharedCacheMap;
1311
1312         OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
1313         InsertTailList(&CcCleanSharedCacheMapList, &SharedCacheMap->SharedCacheMapLinks);
1314         KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
1315     }
1316     if (FileObject->PrivateCacheMap == NULL)
1317     {
1318         PPRIVATE_CACHE_MAP PrivateMap;
1319
1320         /* Allocate the private cache map for this handle */
1321         if (SharedCacheMap->PrivateCacheMap.NodeTypeCode != 0)
1322         {
1323             PrivateMap = ExAllocatePoolWithTag(NonPagedPool, sizeof(PRIVATE_CACHE_MAP), TAG_PRIVATE_CACHE_MAP);
1324         }
1325         else
1326         {
1327             PrivateMap = &SharedCacheMap->PrivateCacheMap;
1328         }
1329
1330         if (PrivateMap == NULL)
1331         {
1332             /* If we also allocated the shared cache map for this file, kill it */
1333             if (Allocated)
1334             {
1335                 OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
1336                 RemoveEntryList(&SharedCacheMap->SharedCacheMapLinks);
1337                 KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
1338
1339                 FileObject->SectionObjectPointer->SharedCacheMap = NULL;
1340                 ObDereferenceObject(FileObject);
1341                 ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList, SharedCacheMap);
1342             }
1343
1344             KeReleaseGuardedMutex(&ViewLock);
1345             return STATUS_INSUFFICIENT_RESOURCES;
1346         }
1347
1348         /* Initialize it */
1349         RtlZeroMemory(PrivateMap, sizeof(PRIVATE_CACHE_MAP));
1350         PrivateMap->NodeTypeCode = NODE_TYPE_PRIVATE_MAP;
1351         PrivateMap->ReadAheadMask = PAGE_SIZE - 1;
1352         PrivateMap->FileObject = FileObject;
1353         KeInitializeSpinLock(&PrivateMap->ReadAheadSpinLock);
1354
1355         /* Link it to the file */
1356         KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &OldIrql);
1357         InsertTailList(&SharedCacheMap->PrivateList, &PrivateMap->PrivateLinks);
1358         KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, OldIrql);
1359
1360         FileObject->PrivateCacheMap = PrivateMap;
1361         SharedCacheMap->OpenCount++;
1362     }
1363     KeReleaseGuardedMutex(&ViewLock);
1364
1365     return STATUS_SUCCESS;
1366 }
1367
1368 /*
1369  * @implemented
1370  */
1371 PFILE_OBJECT
1372 NTAPI
1373 CcGetFileObjectFromSectionPtrs (
1374     IN PSECTION_OBJECT_POINTERS SectionObjectPointers)
1375 {
1376     PROS_SHARED_CACHE_MAP SharedCacheMap;
1377
1378     CCTRACE(CC_API_DEBUG, "SectionObjectPointers=%p\n", SectionObjectPointers);
1379
1380     if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
1381     {
1382         SharedCacheMap = SectionObjectPointers->SharedCacheMap;
1383         ASSERT(SharedCacheMap);
1384         return SharedCacheMap->FileObject;
1385     }
1386     return NULL;
1387 }
1388
1389 VOID
1390 INIT_FUNCTION
1391 NTAPI
1392 CcInitView (
1393     VOID)
1394 {
1395     DPRINT("CcInitView()\n");
1396
1397     InitializeListHead(&DirtyVacbListHead);
1398     InitializeListHead(&VacbLruListHead);
1399     InitializeListHead(&CcDeferredWrites);
1400     InitializeListHead(&CcCleanSharedCacheMapList);
1401     KeInitializeSpinLock(&CcDeferredWriteSpinLock);
1402     KeInitializeGuardedMutex(&ViewLock);
1403     ExInitializeNPagedLookasideList(&iBcbLookasideList,
1404                                     NULL,
1405                                     NULL,
1406                                     0,
1407                                     sizeof(INTERNAL_BCB),
1408                                     TAG_BCB,
1409                                     20);
1410     ExInitializeNPagedLookasideList(&SharedCacheMapLookasideList,
1411                                     NULL,
1412                                     NULL,
1413                                     0,
1414                                     sizeof(ROS_SHARED_CACHE_MAP),
1415                                     TAG_SHARED_CACHE_MAP,
1416                                     20);
1417     ExInitializeNPagedLookasideList(&VacbLookasideList,
1418                                     NULL,
1419                                     NULL,
1420                                     0,
1421                                     sizeof(ROS_VACB),
1422                                     TAG_VACB,
1423                                     20);
1424
1425     MmInitializeMemoryConsumer(MC_CACHE, CcRosTrimCache);
1426
1427     CcInitCacheZeroPage();
1428 }
1429
1430 #if DBG && defined(KDBG)
1431 BOOLEAN
1432 ExpKdbgExtFileCache(ULONG Argc, PCHAR Argv[])
1433 {
1434     PLIST_ENTRY ListEntry;
1435     UNICODE_STRING NoName = RTL_CONSTANT_STRING(L"No name for File");
1436
1437     KdbpPrint("  Usage Summary (in kb)\n");
1438     KdbpPrint("Shared\t\tValid\tDirty\tName\n");
1439     /* No need to lock the spin lock here, we're in DBG */
1440     for (ListEntry = CcCleanSharedCacheMapList.Flink;
1441          ListEntry != &CcCleanSharedCacheMapList;
1442          ListEntry = ListEntry->Flink)
1443     {
1444         PLIST_ENTRY Vacbs;
1445         ULONG Valid = 0, Dirty = 0;
1446         PROS_SHARED_CACHE_MAP SharedCacheMap;
1447         PUNICODE_STRING FileName;
1448
1449         SharedCacheMap = CONTAINING_RECORD(ListEntry, ROS_SHARED_CACHE_MAP, SharedCacheMapLinks);
1450
1451         /* Dirty size */
1452         Dirty = (SharedCacheMap->DirtyPages * PAGE_SIZE) / 1024;
1453
1454         /* First, count for all the associated VACB */
1455         for (Vacbs = SharedCacheMap->CacheMapVacbListHead.Flink;
1456              Vacbs != &SharedCacheMap->CacheMapVacbListHead;
1457              Vacbs = Vacbs->Flink)
1458         {
1459             PROS_VACB Vacb;
1460
1461             Vacb = CONTAINING_RECORD(Vacbs, ROS_VACB, CacheMapVacbListEntry);
1462             if (Vacb->Valid)
1463             {
1464                 Valid += VACB_MAPPING_GRANULARITY / 1024;
1465             }
1466         }
1467
1468         /* Setup name */
1469         if (SharedCacheMap->FileObject != NULL &&
1470             SharedCacheMap->FileObject->FileName.Length != 0)
1471         {
1472             FileName = &SharedCacheMap->FileObject->FileName;
1473         }
1474         else
1475         {
1476             FileName = &NoName;
1477         }
1478
1479         /* And print */
1480         KdbpPrint("%p\t%d\t%d\t%wZ\n", SharedCacheMap, Valid, Dirty, FileName);
1481     }
1482
1483     return TRUE;
1484 }
1485
1486 BOOLEAN
1487 ExpKdbgExtDefWrites(ULONG Argc, PCHAR Argv[])
1488 {
1489     KdbpPrint("CcTotalDirtyPages:\t%lu (%lu Kb)\n", CcTotalDirtyPages,
1490               (CcTotalDirtyPages * PAGE_SIZE) / 1024);
1491     KdbpPrint("CcDirtyPageThreshold:\t%lu (%lu Kb)\n", CcDirtyPageThreshold,
1492               (CcDirtyPageThreshold * PAGE_SIZE) / 1024);
1493     KdbpPrint("MmAvailablePages:\t%lu (%lu Kb)\n", MmAvailablePages,
1494               (MmAvailablePages * PAGE_SIZE) / 1024);
1495     KdbpPrint("MmThrottleTop:\t\t%lu (%lu Kb)\n", MmThrottleTop,
1496               (MmThrottleTop * PAGE_SIZE) / 1024);
1497     KdbpPrint("MmThrottleBottom:\t%lu (%lu Kb)\n", MmThrottleBottom,
1498               (MmThrottleBottom * PAGE_SIZE) / 1024);
1499     KdbpPrint("MmModifiedPageListHead.Total:\t%lu (%lu Kb)\n", MmModifiedPageListHead.Total,
1500               (MmModifiedPageListHead.Total * PAGE_SIZE) / 1024);
1501
1502     if (CcTotalDirtyPages >= CcDirtyPageThreshold)
1503     {
1504         KdbpPrint("CcTotalDirtyPages above the threshold, writes should be throttled\n");
1505     }
1506     else if (CcTotalDirtyPages + 64 >= CcDirtyPageThreshold)
1507     {
1508         KdbpPrint("CcTotalDirtyPages within 64 (max charge) pages of the threshold, writes may be throttled\n");
1509     }
1510     else
1511     {
1512         KdbpPrint("CcTotalDirtyPages below the threshold, writes should not be throttled\n");
1513     }
1514
1515     return TRUE;
1516 }
1517 #endif
1518
1519 /* EOF */