3 * Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * PROJECT: ReactOS kernel
22 * FILE: ntoskrnl/cc/view.c
23 * PURPOSE: Cache manager
24 * PROGRAMMER: David Welch (welch@mcmail.com)
25 * PORTABILITY: Checked
30 /* NOTES **********************************************************************
32 * This is not the NT implementation of a file cache nor anything much like
35 * The general procedure for a filesystem to implement a read or write
36 * dispatch routine is as follows
38 * (1) If caching for the FCB hasn't been initiated then so do by calling
39 * CcInitializeFileCache.
41 * (2) For each 4k region which is being read or written obtain a cache page
42 * by calling CcRequestCachePage.
44 * (3) If either the page is being read or not completely written, and it is
45 * not up to date then read its data from the underlying medium. If the read
46 * fails then call CcReleaseCachePage with VALID as FALSE and return a error.
48 * (4) Copy the data into or out of the page as necessary.
50 * (5) Release the cache page
52 /* INCLUDES ******************************************************************/
54 #include <ddk/ntddk.h>
55 #include <ddk/ntifs.h>
56 #include <internal/mm.h>
57 #include <internal/cc.h>
58 #include <internal/pool.h>
59 #include <ntos/minmax.h>
62 #include <internal/debug.h>
64 /* GLOBALS *******************************************************************/
67 * If CACHE_BITMAP is defined, the cache manager uses one large memory region
68 * within the kernel address space and allocate/deallocate space from this block
69 * over a bitmap. If CACHE_BITMAP is used, the size of the mdl mapping region
70 * must be reduced (ntoskrnl\mm\mdl.c, MI_MDLMAPPING_REGION_SIZE).
72 //#define CACHE_BITMAP
74 #define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
75 #define ROUND_DOWN(N, S) (((N) % (S)) ? ROUND_UP(N, S) - S : N)
77 #define TAG_CSEG TAG('C', 'S', 'E', 'G')
78 #define TAG_BCB TAG('B', 'C', 'B', ' ')
79 #define TAG_IBCB TAG('i', 'B', 'C', 'B')
81 static LIST_ENTRY DirtySegmentListHead;
82 static LIST_ENTRY CacheSegmentListHead;
83 static LIST_ENTRY CacheSegmentLRUListHead;
84 static LIST_ENTRY ClosedListHead;
85 ULONG DirtyPageCount=0;
90 #define CI_CACHESEG_MAPPING_REGION_SIZE (128*1024*1024)
92 static PVOID CiCacheSegMappingRegionBase = NULL;
93 static RTL_BITMAP CiCacheSegMappingRegionAllocMap;
94 static ULONG CiCacheSegMappingRegionHint;
95 static KSPIN_LOCK CiCacheSegMappingRegionLock;
98 NPAGED_LOOKASIDE_LIST iBcbLookasideList;
99 static NPAGED_LOOKASIDE_LIST BcbLookasideList;
100 static NPAGED_LOOKASIDE_LIST CacheSegLookasideList;
102 static ULONG CcTimeStamp;
103 static KEVENT LazyCloseThreadEvent;
104 static HANDLE LazyCloseThreadHandle;
105 static CLIENT_ID LazyCloseThreadId;
106 static volatile BOOLEAN LazyCloseThreadShouldTerminate;
108 void * alloca(size_t size);
111 CcRosInternalFreeCacheSegment(PCACHE_SEGMENT CacheSeg);
113 /* FUNCTIONS *****************************************************************/
116 CcRosFlushCacheSegment(PCACHE_SEGMENT CacheSegment)
120 Status = WriteCacheSegment(CacheSegment);
121 if (NT_SUCCESS(Status))
123 ExAcquireFastMutex(&ViewLock);
124 KeAcquireSpinLock(&CacheSegment->Bcb->BcbLock, &oldIrql);
125 CacheSegment->Dirty = FALSE;
126 RemoveEntryList(&CacheSegment->DirtySegmentListEntry);
127 DirtyPageCount -= CacheSegment->Bcb->CacheSegmentSize / PAGE_SIZE;
128 CacheSegment->ReferenceCount--;
129 KeReleaseSpinLock(&CacheSegment->Bcb->BcbLock, oldIrql);
130 ExReleaseFastMutex(&ViewLock);
135 VOID CcRosRemoveUnusedFiles(VOID);
139 CcRosFlushDirtyPages(ULONG Target, PULONG Count)
141 PLIST_ENTRY current_entry;
142 PCACHE_SEGMENT current;
143 ULONG PagesPerSegment;
146 static ULONG WriteCount[4] = {0, 0, 0, 0};
149 DPRINT("CcRosFlushDirtyPages(Target %d)\n", Target);
153 ExAcquireFastMutex(&ViewLock);
155 WriteCount[0] = WriteCount[1];
156 WriteCount[1] = WriteCount[2];
157 WriteCount[2] = WriteCount[3];
160 NewTarget = WriteCount[0] + WriteCount[1] + WriteCount[2];
162 if (NewTarget < DirtyPageCount)
164 NewTarget = (DirtyPageCount - NewTarget + 3) / 4;
165 WriteCount[0] += NewTarget;
166 WriteCount[1] += NewTarget;
167 WriteCount[2] += NewTarget;
168 WriteCount[3] += NewTarget;
171 NewTarget = WriteCount[0];
173 Target = max(NewTarget, Target);
175 current_entry = DirtySegmentListHead.Flink;
176 if (current_entry == &DirtySegmentListHead)
178 DPRINT("No Dirty pages\n");
180 while (current_entry != &DirtySegmentListHead && Target > 0)
182 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT,
183 DirtySegmentListEntry);
184 current_entry = current_entry->Flink;
185 Locked = ExTryToAcquireFastMutex(¤t->Lock);
190 assert(current->Dirty);
191 if (current->ReferenceCount > 1)
193 ExReleaseFastMutex(¤t->Lock);
196 ExReleaseFastMutex(&ViewLock);
197 PagesPerSegment = current->Bcb->CacheSegmentSize / PAGE_SIZE;
198 Status = CcRosFlushCacheSegment(current);
199 ExReleaseFastMutex(¤t->Lock);
200 if (!NT_SUCCESS(Status) && (Status != STATUS_END_OF_FILE))
202 DPRINT1("CC: Failed to flush cache segment.\n");
206 (*Count) += PagesPerSegment;
207 Target -= PagesPerSegment;
209 ExAcquireFastMutex(&ViewLock);
210 current_entry = DirtySegmentListHead.Flink;
212 if (*Count < NewTarget)
214 WriteCount[1] += (NewTarget - *Count);
216 ExReleaseFastMutex(&ViewLock);
217 DPRINT("CcRosFlushDirtyPages() finished\n");
219 return(STATUS_SUCCESS);
223 CcRosTrimCache(ULONG Target, ULONG Priority, PULONG NrFreed)
225 * FUNCTION: Try to free some memory from the file cache.
227 * Target - The number of pages to be freed.
228 * Priority - The priority of free (currently unused).
229 * NrFreed - Points to a variable where the number of pages
230 * actually freed is returned.
233 PLIST_ENTRY current_entry;
234 PCACHE_SEGMENT current;
235 ULONG PagesPerSegment;
240 DPRINT("CcRosTrimCache(Target %d)\n", Target);
244 InitializeListHead(&FreeList);
246 ExAcquireFastMutex(&ViewLock);
247 current_entry = CacheSegmentLRUListHead.Flink;
248 while (current_entry != &CacheSegmentLRUListHead && Target > 0)
250 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT,
251 CacheSegmentLRUListEntry);
252 current_entry = current_entry->Flink;
254 KeAcquireSpinLock(¤t->Bcb->BcbLock, &oldIrql);
255 if (current->ReferenceCount == 0)
257 RemoveEntryList(¤t->BcbSegmentListEntry);
258 KeReleaseSpinLock(¤t->Bcb->BcbLock, oldIrql);
259 RemoveEntryList(¤t->CacheSegmentListEntry);
260 RemoveEntryList(¤t->CacheSegmentLRUListEntry);
261 InsertHeadList(&FreeList, ¤t->BcbSegmentListEntry);
265 KeReleaseSpinLock(¤t->Bcb->BcbLock, oldIrql);
268 ExReleaseFastMutex(&ViewLock);
270 while (!IsListEmpty(&FreeList))
272 current_entry = RemoveHeadList(&FreeList);
273 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT,
274 BcbSegmentListEntry);
275 PagesPerSegment = current->Bcb->CacheSegmentSize / PAGE_SIZE;
276 PagesFreed = min(PagesPerSegment, Target);
277 Target -= PagesFreed;
278 (*NrFreed) += PagesFreed;
279 CcRosInternalFreeCacheSegment(current);
282 DPRINT("CcRosTrimCache() finished\n");
283 return(STATUS_SUCCESS);
287 CcRosReleaseCacheSegment(PBCB Bcb,
288 PCACHE_SEGMENT CacheSeg,
293 BOOLEAN WasDirty = CacheSeg->Dirty;
298 DPRINT("CcReleaseCacheSegment(Bcb %x, CacheSeg %x, Valid %d)\n",
299 Bcb, CacheSeg, Valid);
301 CacheSeg->Valid = Valid;
302 CacheSeg->Dirty = CacheSeg->Dirty || Dirty;
304 ExAcquireFastMutex(&ViewLock);
305 if (!WasDirty && CacheSeg->Dirty)
307 InsertTailList(&DirtySegmentListHead, &CacheSeg->DirtySegmentListEntry);
308 DirtyPageCount += Bcb->CacheSegmentSize / PAGE_SIZE;
310 RemoveEntryList(&CacheSeg->CacheSegmentLRUListEntry);
311 InsertTailList(&CacheSegmentLRUListHead, &CacheSeg->CacheSegmentLRUListEntry);
315 CacheSeg->MappedCount++;
317 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
318 CacheSeg->ReferenceCount--;
319 if (Mapped && CacheSeg->MappedCount == 1)
321 CacheSeg->ReferenceCount++;
323 if (!WasDirty && CacheSeg->Dirty)
325 CacheSeg->ReferenceCount++;
327 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
328 ExReleaseFastMutex(&ViewLock);
329 ExReleaseFastMutex(&CacheSeg->Lock);
331 return(STATUS_SUCCESS);
335 CcRosLookupCacheSegment(PBCB Bcb, ULONG FileOffset)
337 PLIST_ENTRY current_entry;
338 PCACHE_SEGMENT current;
343 DPRINT("CcRosLookupCacheSegment(Bcb %x, FileOffset %d)\n", Bcb, FileOffset);
345 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
346 current_entry = Bcb->BcbSegmentListHead.Flink;
347 while (current_entry != &Bcb->BcbSegmentListHead)
349 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT,
350 BcbSegmentListEntry);
351 if (current->FileOffset <= FileOffset &&
352 (current->FileOffset + Bcb->CacheSegmentSize) > FileOffset)
354 current->ReferenceCount++;
355 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
358 current_entry = current_entry->Flink;
360 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
365 CcRosMarkDirtyCacheSegment(PBCB Bcb, ULONG FileOffset)
367 PCACHE_SEGMENT CacheSeg;
372 DPRINT("CcRosMarkDirtyCacheSegment(Bcb %x, FileOffset %d)\n", Bcb, FileOffset);
374 CacheSeg = CcRosLookupCacheSegment(Bcb, FileOffset);
375 if (CacheSeg == NULL)
379 ExAcquireFastMutex(&CacheSeg->Lock);
380 if (!CacheSeg->Dirty)
382 ExAcquireFastMutex(&ViewLock);
383 InsertTailList(&DirtySegmentListHead, &CacheSeg->DirtySegmentListEntry);
384 DirtyPageCount += Bcb->CacheSegmentSize / PAGE_SIZE;
385 ExReleaseFastMutex(&ViewLock);
389 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
390 CacheSeg->ReferenceCount--;
391 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
395 CacheSeg->Dirty = TRUE;
396 ExReleaseFastMutex(&CacheSeg->Lock);
398 return(STATUS_SUCCESS);
402 CcRosUnmapCacheSegment(PBCB Bcb, ULONG FileOffset, BOOLEAN NowDirty)
404 PCACHE_SEGMENT CacheSeg;
410 DPRINT("CcRosUnmapCacheSegment(Bcb %x, FileOffset %d, NowDirty %d)\n",
411 Bcb, FileOffset, NowDirty);
413 CacheSeg = CcRosLookupCacheSegment(Bcb, FileOffset);
414 if (CacheSeg == NULL)
416 return(STATUS_UNSUCCESSFUL);
418 ExAcquireFastMutex(&CacheSeg->Lock);
420 WasDirty = CacheSeg->Dirty;
421 CacheSeg->Dirty = CacheSeg->Dirty || NowDirty;
423 CacheSeg->MappedCount--;
425 if (!WasDirty && NowDirty)
427 ExAcquireFastMutex(&ViewLock);
428 InsertTailList(&DirtySegmentListHead, &CacheSeg->DirtySegmentListEntry);
429 DirtyPageCount += Bcb->CacheSegmentSize / PAGE_SIZE;
430 ExReleaseFastMutex(&ViewLock);
433 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
434 CacheSeg->ReferenceCount--;
435 if (!WasDirty && NowDirty)
437 CacheSeg->ReferenceCount++;
439 if (CacheSeg->MappedCount == 0)
441 CacheSeg->ReferenceCount--;
443 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
445 ExReleaseFastMutex(&CacheSeg->Lock);
446 return(STATUS_SUCCESS);
450 CcRosCreateCacheSegment(PBCB Bcb,
452 PCACHE_SEGMENT* CacheSeg,
456 PCACHE_SEGMENT current;
457 PLIST_ENTRY current_entry;
461 ULONG StartingOffset;
466 DPRINT("CcRosCreateCacheSegment()\n");
468 current = ExAllocateFromNPagedLookasideList(&CacheSegLookasideList);
469 current->Valid = FALSE;
470 current->Dirty = FALSE;
471 current->FileOffset = ROUND_DOWN(FileOffset, Bcb->CacheSegmentSize);
473 current->MappedCount = 0;
474 current->DirtySegmentListEntry.Flink = NULL;
475 current->DirtySegmentListEntry.Blink = NULL;
476 current->ReferenceCount = 1;
477 ExInitializeFastMutex(¤t->Lock);
478 ExAcquireFastMutex(¤t->Lock);
479 ExAcquireFastMutex(&ViewLock);
482 /* There is window between the call to CcRosLookupCacheSegment
483 * and CcRosCreateCacheSegment. We must check if a segment on
484 * the fileoffset exist. If there exist a segment, we release
485 * our new created segment and return the existing one.
487 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
488 current_entry = Bcb->BcbSegmentListHead.Flink;
489 while (current_entry != &Bcb->BcbSegmentListHead)
491 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT,
492 BcbSegmentListEntry);
493 if (current->FileOffset <= FileOffset &&
494 (current->FileOffset + Bcb->CacheSegmentSize) > FileOffset)
496 current->ReferenceCount++;
497 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
498 ExReleaseFastMutex(&(*CacheSeg)->Lock);
499 ExReleaseFastMutex(&ViewLock);
500 ExFreeToNPagedLookasideList(&CacheSegLookasideList, *CacheSeg);
504 ExAcquireFastMutex(¤t->Lock);
506 return STATUS_SUCCESS;
508 current_entry = current_entry->Flink;
510 /* There was no existing segment. */
512 InsertTailList(&Bcb->BcbSegmentListHead, ¤t->BcbSegmentListEntry);
513 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
514 InsertTailList(&CacheSegmentListHead, ¤t->CacheSegmentListEntry);
515 InsertTailList(&CacheSegmentLRUListHead, ¤t->CacheSegmentLRUListEntry);
516 ExReleaseFastMutex(&ViewLock);
518 KeAcquireSpinLock(&CiCacheSegMappingRegionLock, &oldIrql);
520 StartingOffset = RtlFindClearBitsAndSet(&CiCacheSegMappingRegionAllocMap, Bcb->CacheSegmentSize / PAGE_SIZE, CiCacheSegMappingRegionHint);
522 if (StartingOffset == 0xffffffff)
524 DPRINT1("Out of CacheSeg mapping space\n");
528 current->BaseAddress = CiCacheSegMappingRegionBase + StartingOffset * PAGE_SIZE;
530 if (CiCacheSegMappingRegionHint == StartingOffset)
532 CiCacheSegMappingRegionHint += Bcb->CacheSegmentSize / PAGE_SIZE;
535 KeReleaseSpinLock(&CiCacheSegMappingRegionLock, oldIrql);
537 MmLockAddressSpace(MmGetKernelAddressSpace());
538 current->BaseAddress = NULL;
539 Status = MmCreateMemoryArea(NULL,
540 MmGetKernelAddressSpace(),
541 MEMORY_AREA_CACHE_SEGMENT,
542 ¤t->BaseAddress,
543 Bcb->CacheSegmentSize,
545 (PMEMORY_AREA*)¤t->MemoryArea,
547 MmUnlockAddressSpace(MmGetKernelAddressSpace());
548 if (!NT_SUCCESS(Status))
553 for (i = 0; i < (Bcb->CacheSegmentSize / PAGE_SIZE); i++)
555 PHYSICAL_ADDRESS Page;
557 Status = MmRequestPageMemoryConsumer(MC_CACHE, TRUE, &Page);
558 if (!NT_SUCCESS(Status))
563 Status = MmCreateVirtualMapping(NULL,
564 current->BaseAddress + (i * PAGE_SIZE),
568 if (!NT_SUCCESS(Status))
575 ExReleaseFastMutex(¤t->Lock);
578 return(STATUS_SUCCESS);
582 CcRosGetCacheSegmentChain(PBCB Bcb,
585 PCACHE_SEGMENT* CacheSeg)
587 PCACHE_SEGMENT current;
589 PCACHE_SEGMENT* CacheSegList;
590 PCACHE_SEGMENT Previous = NULL;
594 DPRINT("CcRosGetCacheSegmentChain()\n");
596 Length = ROUND_UP(Length, Bcb->CacheSegmentSize);
598 CacheSegList = alloca(sizeof(PCACHE_SEGMENT) *
599 (Length / Bcb->CacheSegmentSize));
602 * Look for a cache segment already mapping the same data.
604 for (i = 0; i < (Length / Bcb->CacheSegmentSize); i++)
606 ULONG CurrentOffset = FileOffset + (i * Bcb->CacheSegmentSize);
607 current = CcRosLookupCacheSegment(Bcb, CurrentOffset);
610 CacheSegList[i] = current;
614 CcRosCreateCacheSegment(Bcb, CurrentOffset, ¤t, FALSE);
615 CacheSegList[i] = current;
619 for (i = 0; i < (Length / Bcb->CacheSegmentSize); i++)
621 ExAcquireFastMutex(&CacheSegList[i]->Lock);
624 *CacheSeg = CacheSegList[i];
625 Previous = CacheSegList[i];
629 Previous->NextInChain = CacheSegList[i];
630 Previous = CacheSegList[i];
633 Previous->NextInChain = NULL;
635 return(STATUS_SUCCESS);
639 CcRosGetCacheSegment(PBCB Bcb,
644 PCACHE_SEGMENT* CacheSeg)
646 PCACHE_SEGMENT current;
651 DPRINT("CcRosGetCacheSegment()\n");
654 * Look for a cache segment already mapping the same data.
656 current = CcRosLookupCacheSegment(Bcb, FileOffset);
659 ExAcquireFastMutex(¤t->Lock);
664 * Otherwise create a new segment.
666 Status = CcRosCreateCacheSegment(Bcb, FileOffset, ¤t, TRUE);
669 * Return information about the segment to the caller.
671 *UptoDate = current->Valid;
672 *BaseAddress = current->BaseAddress;
673 DPRINT("*BaseAddress 0x%.8X\n", *BaseAddress);
675 *BaseOffset = current->FileOffset;
676 return(STATUS_SUCCESS);
680 CcRosRequestCacheSegment(PBCB Bcb,
684 PCACHE_SEGMENT* CacheSeg)
686 * FUNCTION: Request a page mapping for a BCB
693 if ((FileOffset % Bcb->CacheSegmentSize) != 0)
695 CPRINT("Bad fileoffset %x should be multiple of %x",
696 FileOffset, Bcb->CacheSegmentSize);
700 return(CcRosGetCacheSegment(Bcb,
710 CcFreeCachePage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID Address,
711 PHYSICAL_ADDRESS PhysAddr, SWAPENTRY SwapEntry, BOOLEAN Dirty)
713 assert(SwapEntry == 0);
714 if (PhysAddr.QuadPart != 0)
716 MmReleasePageMemoryConsumer(MC_CACHE, PhysAddr);
721 CcRosInternalFreeCacheSegment(PCACHE_SEGMENT CacheSeg)
723 * FUNCTION: Releases a cache segment associated with a BCB
730 PHYSICAL_ADDRESS PhysicalAddr;
733 DPRINT("Freeing cache segment %x\n", CacheSeg);
735 RegionSize = CacheSeg->Bcb->CacheSegmentSize / PAGE_SIZE;
737 /* Unmap all the pages. */
738 for (i = 0; i < RegionSize; i++)
740 MmDeleteVirtualMapping(NULL,
741 CacheSeg->BaseAddress + (i * PAGE_SIZE),
745 MmReleasePageMemoryConsumer(MC_CACHE, PhysicalAddr);
748 KeAcquireSpinLock(&CiCacheSegMappingRegionLock, &oldIrql);
749 /* Deallocate all the pages used. */
750 Base = (ULONG)(CacheSeg->BaseAddress - CiCacheSegMappingRegionBase) / PAGE_SIZE;
752 RtlClearBits(&CiCacheSegMappingRegionAllocMap, Base, RegionSize);
754 CiCacheSegMappingRegionHint = min (CiCacheSegMappingRegionHint, Base);
756 KeReleaseSpinLock(&CiCacheSegMappingRegionLock, oldIrql);
758 MmLockAddressSpace(MmGetKernelAddressSpace());
759 MmFreeMemoryArea(MmGetKernelAddressSpace(),
760 CacheSeg->BaseAddress,
761 CacheSeg->Bcb->CacheSegmentSize,
764 MmUnlockAddressSpace(MmGetKernelAddressSpace());
766 ExFreeToNPagedLookasideList(&CacheSegLookasideList, CacheSeg);
767 return(STATUS_SUCCESS);
771 CcRosFreeCacheSegment(PBCB Bcb, PCACHE_SEGMENT CacheSeg)
778 DPRINT("CcRosFreeCacheSegment(Bcb %x, CacheSeg %x)\n",
781 ExAcquireFastMutex(&ViewLock);
782 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
783 RemoveEntryList(&CacheSeg->BcbSegmentListEntry);
784 RemoveEntryList(&CacheSeg->CacheSegmentListEntry);
785 RemoveEntryList(&CacheSeg->CacheSegmentLRUListEntry);
788 RemoveEntryList(&CacheSeg->DirtySegmentListEntry);
789 DirtyPageCount -= Bcb->CacheSegmentSize / PAGE_SIZE;
792 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
793 ExReleaseFastMutex(&ViewLock);
795 Status = CcRosInternalFreeCacheSegment(CacheSeg);
800 CcFlushCache(IN PSECTION_OBJECT_POINTERS SectionObjectPointers,
801 IN PLARGE_INTEGER FileOffset OPTIONAL,
803 OUT PIO_STATUS_BLOCK IoStatus)
806 LARGE_INTEGER Offset;
807 PCACHE_SEGMENT current;
811 DPRINT("CcFlushCache(SectionObjectPointers %x, FileOffset %x, Length %d, IoStatus %x)\n",
812 SectionObjectPointers, FileOffset, Length, IoStatus);
814 if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
816 Bcb = (PBCB)SectionObjectPointers->SharedCacheMap;
820 Offset = *FileOffset;
824 Offset.QuadPart = 0LL;
825 Length = Bcb->FileSize.u.LowPart;
830 IoStatus->Status = STATUS_SUCCESS;
831 IoStatus->Information = 0;
836 current = CcRosLookupCacheSegment (Bcb, Offset.u.LowPart);
839 ExAcquireFastMutex(¤t->Lock);
842 Status = CcRosFlushCacheSegment(current);
843 if (!NT_SUCCESS(Status) && IoStatus != NULL)
845 IoStatus->Status = Status;
848 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
849 ExReleaseFastMutex(¤t->Lock);
850 current->ReferenceCount--;
851 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
854 Offset.QuadPart += Bcb->CacheSegmentSize;
855 if (Length > Bcb->CacheSegmentSize)
857 Length -= Bcb->CacheSegmentSize;
869 IoStatus->Status = STATUS_INVALID_PARAMETER;
875 CcRosDeleteFileCache(PFILE_OBJECT FileObject, PBCB Bcb)
877 * FUNCTION: Releases the BCB associated with a file object
880 PLIST_ENTRY current_entry;
881 PCACHE_SEGMENT current;
889 ExReleaseFastMutex(&ViewLock);
891 CcFlushCache(FileObject->SectionObjectPointers, NULL, 0, NULL);
893 ExAcquireFastMutex(&ViewLock);
895 if (Bcb->RefCount == 0)
897 if (Bcb->BcbRemoveListEntry.Flink != NULL)
899 RemoveEntryList(&Bcb->BcbRemoveListEntry);
900 Bcb->BcbRemoveListEntry.Flink = NULL;
903 FileObject->SectionObjectPointers->SharedCacheMap = NULL;
906 * Release all cache segments.
908 InitializeListHead(&FreeList);
909 KeAcquireSpinLock(&Bcb->BcbLock, &oldIrql);
910 current_entry = Bcb->BcbSegmentListHead.Flink;
911 while (!IsListEmpty(&Bcb->BcbSegmentListHead))
913 current_entry = RemoveTailList(&Bcb->BcbSegmentListHead);
914 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT, BcbSegmentListEntry);
915 RemoveEntryList(¤t->CacheSegmentListEntry);
916 RemoveEntryList(¤t->CacheSegmentLRUListEntry);
919 RemoveEntryList(¤t->DirtySegmentListEntry);
920 DirtyPageCount -= Bcb->CacheSegmentSize / PAGE_SIZE;
921 DPRINT1("Freeing dirty segment\n");
923 InsertHeadList(&FreeList, ¤t->BcbSegmentListEntry);
925 KeReleaseSpinLock(&Bcb->BcbLock, oldIrql);
927 ExReleaseFastMutex(&ViewLock);
928 ObDereferenceObject (Bcb->FileObject);
930 while (!IsListEmpty(&FreeList))
932 current_entry = RemoveTailList(&FreeList);
933 current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT, BcbSegmentListEntry);
934 Status = CcRosInternalFreeCacheSegment(current);
936 ExFreeToNPagedLookasideList(&BcbLookasideList, Bcb);
937 ExAcquireFastMutex(&ViewLock);
939 return(STATUS_SUCCESS);
942 VOID CcRosReferenceCache(PFILE_OBJECT FileObject)
945 ExAcquireFastMutex(&ViewLock);
946 Bcb = (PBCB)FileObject->SectionObjectPointers->SharedCacheMap;
949 ExReleaseFastMutex(&ViewLock);
952 VOID CcRosSetRemoveOnClose(PSECTION_OBJECT_POINTERS SectionObjectPointer)
955 // DPRINT1("CcRosSetRemoveOnClose()\n");
956 ExAcquireFastMutex(&ViewLock);
957 Bcb = (PBCB)SectionObjectPointer->SharedCacheMap;
960 Bcb->RemoveOnClose = TRUE;
961 if (Bcb->RefCount == 0)
963 CcRosDeleteFileCache(Bcb->FileObject, Bcb);
966 ExReleaseFastMutex(&ViewLock);
970 VOID CcRosDereferenceCache(PFILE_OBJECT FileObject)
973 ExAcquireFastMutex(&ViewLock);
974 Bcb = (PBCB)FileObject->SectionObjectPointers->SharedCacheMap;
976 if (Bcb->RefCount > 0)
979 if (Bcb->RefCount == 0)
981 MmFreeSectionSegments(Bcb->FileObject);
982 if (Bcb->RemoveOnClose)
984 CcRosDeleteFileCache(FileObject, Bcb);
988 Bcb->TimeStamp = CcTimeStamp;
989 InsertHeadList(&ClosedListHead, &Bcb->BcbRemoveListEntry);
993 ExReleaseFastMutex(&ViewLock);
997 CcRosReleaseFileCache(PFILE_OBJECT FileObject)
999 * FUNCTION: Called by the file system when a handle to a file object
1005 ExAcquireFastMutex(&ViewLock);
1007 if (FileObject->SectionObjectPointers->SharedCacheMap != NULL)
1009 Bcb = FileObject->SectionObjectPointers->SharedCacheMap;
1010 if (FileObject->PrivateCacheMap != NULL)
1012 FileObject->PrivateCacheMap = NULL;
1013 if (Bcb->RefCount > 0)
1016 if (Bcb->RefCount == 0)
1018 if (Bcb->RemoveOnClose)
1020 CcRosDeleteFileCache(FileObject, Bcb);
1024 Bcb->TimeStamp = CcTimeStamp;
1025 InsertHeadList(&ClosedListHead, &Bcb->BcbRemoveListEntry);
1031 ExReleaseFastMutex(&ViewLock);
1032 return(STATUS_SUCCESS);
1036 CcRosInitializeFileCache(PFILE_OBJECT FileObject,
1037 ULONG CacheSegmentSize)
1039 * FUNCTION: Initializes a BCB for a file object
1043 DPRINT("CcRosInitializeFileCache(FileObject %x, *Bcb %x, CacheSegmentSize %d)\n",
1044 FileObject, Bcb, CacheSegmentSize);
1046 ExAcquireFastMutex(&ViewLock);
1048 Bcb = FileObject->SectionObjectPointers->SharedCacheMap;
1051 Bcb = ExAllocateFromNPagedLookasideList(&BcbLookasideList);
1054 ExReleaseFastMutex(&ViewLock);
1055 return(STATUS_UNSUCCESSFUL);
1057 memset(Bcb, 0, sizeof(BCB));
1058 ObReferenceObjectByPointer(FileObject,
1062 Bcb->FileObject = FileObject;
1063 Bcb->CacheSegmentSize = CacheSegmentSize;
1064 if (FileObject->FsContext)
1066 Bcb->AllocationSize =
1067 ((REACTOS_COMMON_FCB_HEADER*)FileObject->FsContext)->AllocationSize;
1069 ((REACTOS_COMMON_FCB_HEADER*)FileObject->FsContext)->FileSize;
1071 KeInitializeSpinLock(&Bcb->BcbLock);
1072 InitializeListHead(&Bcb->BcbSegmentListHead);
1073 FileObject->SectionObjectPointers->SharedCacheMap = Bcb;
1075 if (FileObject->PrivateCacheMap == NULL)
1077 FileObject->PrivateCacheMap = Bcb;
1080 if (Bcb->BcbRemoveListEntry.Flink != NULL)
1082 RemoveEntryList(&Bcb->BcbRemoveListEntry);
1083 Bcb->BcbRemoveListEntry.Flink = NULL;
1085 ExReleaseFastMutex(&ViewLock);
1087 return(STATUS_SUCCESS);
1090 PFILE_OBJECT STDCALL
1091 CcGetFileObjectFromSectionPtrs(IN PSECTION_OBJECT_POINTERS SectionObjectPointers)
1094 if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
1096 Bcb = (PBCB)SectionObjectPointers->SharedCacheMap;
1098 return Bcb->FileObject;
1104 CmLazyCloseThreadMain(PVOID Ignored)
1106 LARGE_INTEGER Timeout;
1107 PLIST_ENTRY current_entry;
1109 ULONG RemoveTimeStamp;
1112 KeQuerySystemTime (&Timeout);
1116 Timeout.QuadPart += 100000000LL; // 10sec
1117 Status = KeWaitForSingleObject(&LazyCloseThreadEvent,
1123 DPRINT("LazyCloseThreadMain %d\n", CcTimeStamp);
1125 if (!NT_SUCCESS(Status))
1127 DbgPrint("LazyCloseThread: Wait failed\n");
1131 if (LazyCloseThreadShouldTerminate)
1133 DbgPrint("LazyCloseThread: Terminating\n");
1137 ExAcquireFastMutex(&ViewLock);
1139 if (CcTimeStamp >= 30)
1141 RemoveTimeStamp = CcTimeStamp - 30; /* 5min = 10sec * 30 */
1142 while (!IsListEmpty(&ClosedListHead))
1144 current_entry = ClosedListHead.Blink;
1145 current = CONTAINING_RECORD(current_entry, BCB, BcbRemoveListEntry);
1146 if (current->TimeStamp >= RemoveTimeStamp)
1150 CcRosDeleteFileCache(current->FileObject, current);
1153 ExReleaseFastMutex(&ViewLock);
1167 DPRINT("CcInitView()\n");
1169 CiCacheSegMappingRegionHint = 0;
1170 CiCacheSegMappingRegionBase = NULL;
1172 MmLockAddressSpace(MmGetKernelAddressSpace());
1174 Status = MmCreateMemoryArea(NULL,
1175 MmGetKernelAddressSpace(),
1176 MEMORY_AREA_CACHE_SEGMENT,
1177 &CiCacheSegMappingRegionBase,
1178 CI_CACHESEG_MAPPING_REGION_SIZE,
1182 MmUnlockAddressSpace(MmGetKernelAddressSpace());
1183 if (!NT_SUCCESS(Status))
1188 Buffer = ExAllocatePool(NonPagedPool, CI_CACHESEG_MAPPING_REGION_SIZE / (PAGE_SIZE * 8));
1190 RtlInitializeBitMap(&CiCacheSegMappingRegionAllocMap, Buffer, CI_CACHESEG_MAPPING_REGION_SIZE / PAGE_SIZE);
1191 RtlClearAllBits(&CiCacheSegMappingRegionAllocMap);
1193 KeInitializeSpinLock(&CiCacheSegMappingRegionLock);
1195 InitializeListHead(&CacheSegmentListHead);
1196 InitializeListHead(&DirtySegmentListHead);
1197 InitializeListHead(&CacheSegmentLRUListHead);
1198 InitializeListHead(&ClosedListHead);
1199 ExInitializeFastMutex(&ViewLock);
1200 ExInitializeNPagedLookasideList (&iBcbLookasideList,
1204 sizeof(INTERNAL_BCB),
1207 ExInitializeNPagedLookasideList (&BcbLookasideList,
1214 ExInitializeNPagedLookasideList (&CacheSegLookasideList,
1218 sizeof(CACHE_SEGMENT),
1222 MmInitializeMemoryConsumer(MC_CACHE, CcRosTrimCache);
1224 CcInitCacheZeroPage();
1227 LazyCloseThreadShouldTerminate = FALSE;
1228 KeInitializeEvent (&LazyCloseThreadEvent, SynchronizationEvent, FALSE);
1229 Status = PsCreateSystemThread(&LazyCloseThreadHandle,
1234 (PKSTART_ROUTINE)CmLazyCloseThreadMain,
1236 if (NT_SUCCESS(Status))
1238 Priority = LOW_REALTIME_PRIORITY;
1239 NtSetInformationThread(LazyCloseThreadHandle,