2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS kernel
4 * FILE: ntoskrnl/cc/view.c
5 * PURPOSE: Cache manager
7 * PROGRAMMERS: David Welch (welch@mcmail.com)
8 * Pierre Schweitzer (pierre@reactos.org)
11 /* NOTES **********************************************************************
13 * This is not the NT implementation of a file cache nor anything much like
16 * The general procedure for a filesystem to implement a read or write
17 * dispatch routine is as follows
19 * (1) If caching for the FCB hasn't been initiated then so do by calling
20 * CcInitializeFileCache.
22 * (2) For each 4k region which is being read or written obtain a cache page
23 * by calling CcRequestCachePage.
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.
29 * (4) Copy the data into or out of the page as necessary.
31 * (5) Release the cache page
33 /* INCLUDES ******************************************************************/
39 #if defined (ALLOC_PRAGMA)
40 #pragma alloc_text(INIT, CcInitView)
43 /* GLOBALS *******************************************************************/
45 LIST_ENTRY DirtyVacbListHead
;
46 static LIST_ENTRY VacbLruListHead
;
48 KGUARDED_MUTEX ViewLock
;
50 NPAGED_LOOKASIDE_LIST iBcbLookasideList
;
51 static NPAGED_LOOKASIDE_LIST SharedCacheMapLookasideList
;
52 static NPAGED_LOOKASIDE_LIST VacbLookasideList
;
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
61 ULONG CcDirtyPageThreshold
= 0;
62 ULONG CcTotalDirtyPages
= 0;
63 LIST_ENTRY CcDeferredWrites
;
64 KSPIN_LOCK CcDeferredWriteSpinLock
;
65 LIST_ENTRY CcCleanSharedCacheMapList
;
68 ULONG
CcRosVacbIncRefCount_(PROS_VACB vacb
, PCSTR file
, INT line
)
72 Refs
= InterlockedIncrement((PLONG
)&vacb
->ReferenceCount
);
73 if (vacb
->SharedCacheMap
->Trace
)
75 DbgPrint("(%s:%i) VACB %p ++RefCount=%lu, Dirty %u, PageOut %lu\n",
76 file
, line
, vacb
, Refs
, vacb
->Dirty
, vacb
->PageOut
);
81 ULONG
CcRosVacbDecRefCount_(PROS_VACB vacb
, PCSTR file
, INT line
)
85 Refs
= InterlockedDecrement((PLONG
)&vacb
->ReferenceCount
);
86 ASSERT(!(Refs
== 0 && vacb
->Dirty
));
87 if (vacb
->SharedCacheMap
->Trace
)
89 DbgPrint("(%s:%i) VACB %p --RefCount=%lu, Dirty %u, PageOut %lu\n",
90 file
, line
, vacb
, Refs
, vacb
->Dirty
, vacb
->PageOut
);
95 CcRosInternalFreeVacb(vacb
);
100 ULONG
CcRosVacbGetRefCount_(PROS_VACB vacb
, PCSTR file
, INT line
)
104 Refs
= InterlockedCompareExchange((PLONG
)&vacb
->ReferenceCount
, 0, 0);
105 if (vacb
->SharedCacheMap
->Trace
)
107 DbgPrint("(%s:%i) VACB %p ==RefCount=%lu, Dirty %u, PageOut %lu\n",
108 file
, line
, vacb
, Refs
, vacb
->Dirty
, vacb
->PageOut
);
116 /* FUNCTIONS *****************************************************************/
121 PROS_SHARED_CACHE_MAP SharedCacheMap
,
126 PLIST_ENTRY current_entry
;
132 SharedCacheMap
->Trace
= Trace
;
136 DPRINT1("Enabling Tracing for CacheMap 0x%p:\n", SharedCacheMap
);
138 KeAcquireGuardedMutex(&ViewLock
);
139 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldirql
);
141 current_entry
= SharedCacheMap
->CacheMapVacbListHead
.Flink
;
142 while (current_entry
!= &SharedCacheMap
->CacheMapVacbListHead
)
144 current
= CONTAINING_RECORD(current_entry
, ROS_VACB
, CacheMapVacbListEntry
);
145 current_entry
= current_entry
->Flink
;
147 DPRINT1(" VACB 0x%p enabled, RefCount %lu, Dirty %u, PageOut %lu\n",
148 current
, current
->ReferenceCount
, current
->Dirty
, current
->PageOut
);
150 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldirql
);
151 KeReleaseGuardedMutex(&ViewLock
);
155 DPRINT1("Disabling Tracing for CacheMap 0x%p:\n", SharedCacheMap
);
159 UNREFERENCED_PARAMETER(SharedCacheMap
);
160 UNREFERENCED_PARAMETER(Trace
);
171 Status
= CcWriteVirtualAddress(Vacb
);
172 if (NT_SUCCESS(Status
))
174 CcRosUnmarkDirtyVacb(Vacb
, TRUE
);
182 CcRosFlushDirtyPages (
186 BOOLEAN CalledFromLazy
)
188 PLIST_ENTRY current_entry
;
193 DPRINT("CcRosFlushDirtyPages(Target %lu)\n", Target
);
197 KeEnterCriticalRegion();
198 KeAcquireGuardedMutex(&ViewLock
);
200 current_entry
= DirtyVacbListHead
.Flink
;
201 if (current_entry
== &DirtyVacbListHead
)
203 DPRINT("No Dirty pages\n");
206 while ((current_entry
!= &DirtyVacbListHead
) && (Target
> 0))
210 current
= CONTAINING_RECORD(current_entry
,
213 current_entry
= current_entry
->Flink
;
215 CcRosVacbIncRefCount(current
);
217 /* When performing lazy write, don't handle temporary files */
218 if (CalledFromLazy
&&
219 BooleanFlagOn(current
->SharedCacheMap
->FileObject
->Flags
, FO_TEMPORARY_FILE
))
221 CcRosVacbDecRefCount(current
);
225 Locked
= current
->SharedCacheMap
->Callbacks
->AcquireForLazyWrite(
226 current
->SharedCacheMap
->LazyWriteContext
, Wait
);
229 CcRosVacbDecRefCount(current
);
233 ASSERT(current
->Dirty
);
235 /* One reference is added above */
236 Refs
= CcRosVacbGetRefCount(current
);
237 if ((Refs
> 3 && current
->PinCount
== 0) ||
238 (Refs
> 4 && current
->PinCount
> 1))
240 current
->SharedCacheMap
->Callbacks
->ReleaseFromLazyWrite(
241 current
->SharedCacheMap
->LazyWriteContext
);
242 CcRosVacbDecRefCount(current
);
246 KeReleaseGuardedMutex(&ViewLock
);
248 Status
= CcRosFlushVacb(current
);
250 current
->SharedCacheMap
->Callbacks
->ReleaseFromLazyWrite(
251 current
->SharedCacheMap
->LazyWriteContext
);
253 KeAcquireGuardedMutex(&ViewLock
);
254 CcRosVacbDecRefCount(current
);
256 if (!NT_SUCCESS(Status
) && (Status
!= STATUS_END_OF_FILE
) &&
257 (Status
!= STATUS_MEDIA_WRITE_PROTECTED
))
259 DPRINT1("CC: Failed to flush VACB.\n");
265 /* How many pages did we free? */
266 PagesFreed
= VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
;
267 (*Count
) += PagesFreed
;
269 /* Make sure we don't overflow target! */
270 if (Target
< PagesFreed
)
272 /* If we would have, jump to zero directly */
277 Target
-= PagesFreed
;
281 current_entry
= DirtyVacbListHead
.Flink
;
284 KeReleaseGuardedMutex(&ViewLock
);
285 KeLeaveCriticalRegion();
287 DPRINT("CcRosFlushDirtyPages() finished\n");
288 return STATUS_SUCCESS
;
297 * FUNCTION: Try to free some memory from the file cache.
299 * Target - The number of pages to be freed.
300 * Priority - The priority of free (currently unused).
301 * NrFreed - Points to a variable where the number of pages
302 * actually freed is returned.
305 PLIST_ENTRY current_entry
;
312 BOOLEAN FlushedPages
= FALSE
;
314 DPRINT("CcRosTrimCache(Target %lu)\n", Target
);
316 InitializeListHead(&FreeList
);
321 KeAcquireGuardedMutex(&ViewLock
);
323 current_entry
= VacbLruListHead
.Flink
;
324 while (current_entry
!= &VacbLruListHead
)
328 current
= CONTAINING_RECORD(current_entry
,
331 current_entry
= current_entry
->Flink
;
333 KeAcquireSpinLock(¤t
->SharedCacheMap
->CacheMapLock
, &oldIrql
);
335 /* Reference the VACB */
336 CcRosVacbIncRefCount(current
);
338 /* Check if it's mapped and not dirty */
339 if (InterlockedCompareExchange((PLONG
)¤t
->MappedCount
, 0, 0) > 0 && !current
->Dirty
)
341 /* We have to break these locks because Cc sucks */
342 KeReleaseSpinLock(¤t
->SharedCacheMap
->CacheMapLock
, oldIrql
);
343 KeReleaseGuardedMutex(&ViewLock
);
345 /* Page out the VACB */
346 for (i
= 0; i
< VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
; i
++)
348 Page
= (PFN_NUMBER
)(MmGetPhysicalAddress((PUCHAR
)current
->BaseAddress
+ (i
* PAGE_SIZE
)).QuadPart
>> PAGE_SHIFT
);
350 MmPageOutPhysicalAddress(Page
);
353 /* Reacquire the locks */
354 KeAcquireGuardedMutex(&ViewLock
);
355 KeAcquireSpinLock(¤t
->SharedCacheMap
->CacheMapLock
, &oldIrql
);
358 /* Dereference the VACB */
359 Refs
= CcRosVacbDecRefCount(current
);
361 /* Check if we can free this entry now */
364 ASSERT(!current
->Dirty
);
365 ASSERT(!current
->MappedCount
);
368 RemoveEntryList(¤t
->CacheMapVacbListEntry
);
369 RemoveEntryList(¤t
->VacbLruListEntry
);
370 InitializeListHead(¤t
->VacbLruListEntry
);
371 InsertHeadList(&FreeList
, ¤t
->CacheMapVacbListEntry
);
373 /* Calculate how many pages we freed for Mm */
374 PagesFreed
= min(VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
, Target
);
375 Target
-= PagesFreed
;
376 (*NrFreed
) += PagesFreed
;
379 KeReleaseSpinLock(¤t
->SharedCacheMap
->CacheMapLock
, oldIrql
);
382 KeReleaseGuardedMutex(&ViewLock
);
384 /* Try flushing pages if we haven't met our target */
385 if ((Target
> 0) && !FlushedPages
)
387 /* Flush dirty pages to disk */
388 CcRosFlushDirtyPages(Target
, &PagesFreed
, FALSE
, FALSE
);
391 /* We can only swap as many pages as we flushed */
392 if (PagesFreed
< Target
) Target
= PagesFreed
;
394 /* Check if we flushed anything */
397 /* Try again after flushing dirty pages */
398 DPRINT("Flushed %lu dirty cache pages to disk\n", PagesFreed
);
403 while (!IsListEmpty(&FreeList
))
407 current_entry
= RemoveHeadList(&FreeList
);
408 current
= CONTAINING_RECORD(current_entry
,
410 CacheMapVacbListEntry
);
411 InitializeListHead(¤t
->CacheMapVacbListEntry
);
412 Refs
= CcRosVacbDecRefCount(current
);
416 DPRINT("Evicted %lu cache pages\n", (*NrFreed
));
418 return STATUS_SUCCESS
;
424 PROS_SHARED_CACHE_MAP SharedCacheMap
,
431 ASSERT(SharedCacheMap
);
433 DPRINT("CcRosReleaseVacb(SharedCacheMap 0x%p, Vacb 0x%p, Valid %u)\n",
434 SharedCacheMap
, Vacb
, Valid
);
438 if (Dirty
&& !Vacb
->Dirty
)
440 CcRosMarkDirtyVacb(Vacb
);
445 if (InterlockedIncrement((PLONG
)&Vacb
->MappedCount
) == 1)
447 CcRosVacbIncRefCount(Vacb
);
451 Refs
= CcRosVacbDecRefCount(Vacb
);
454 return STATUS_SUCCESS
;
457 /* Returns with VACB Lock Held! */
461 PROS_SHARED_CACHE_MAP SharedCacheMap
,
464 PLIST_ENTRY current_entry
;
468 ASSERT(SharedCacheMap
);
470 DPRINT("CcRosLookupVacb(SharedCacheMap 0x%p, FileOffset %I64u)\n",
471 SharedCacheMap
, FileOffset
);
473 KeAcquireGuardedMutex(&ViewLock
);
474 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
476 current_entry
= SharedCacheMap
->CacheMapVacbListHead
.Flink
;
477 while (current_entry
!= &SharedCacheMap
->CacheMapVacbListHead
)
479 current
= CONTAINING_RECORD(current_entry
,
481 CacheMapVacbListEntry
);
482 if (IsPointInRange(current
->FileOffset
.QuadPart
,
483 VACB_MAPPING_GRANULARITY
,
486 CcRosVacbIncRefCount(current
);
487 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
488 KeReleaseGuardedMutex(&ViewLock
);
491 if (current
->FileOffset
.QuadPart
> FileOffset
)
493 current_entry
= current_entry
->Flink
;
496 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
497 KeReleaseGuardedMutex(&ViewLock
);
508 PROS_SHARED_CACHE_MAP SharedCacheMap
;
510 SharedCacheMap
= Vacb
->SharedCacheMap
;
512 KeAcquireGuardedMutex(&ViewLock
);
513 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
515 ASSERT(!Vacb
->Dirty
);
517 InsertTailList(&DirtyVacbListHead
, &Vacb
->DirtyVacbListEntry
);
518 CcTotalDirtyPages
+= VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
;
519 Vacb
->SharedCacheMap
->DirtyPages
+= VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
;
520 CcRosVacbIncRefCount(Vacb
);
522 /* Move to the tail of the LRU list */
523 RemoveEntryList(&Vacb
->VacbLruListEntry
);
524 InsertTailList(&VacbLruListHead
, &Vacb
->VacbLruListEntry
);
528 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
529 KeReleaseGuardedMutex(&ViewLock
);
531 /* Schedule a lazy writer run to now that we have dirty VACB */
532 oldIrql
= KeAcquireQueuedSpinLock(LockQueueMasterLock
);
533 if (!LazyWriter
.ScanActive
)
535 CcScheduleLazyWriteScan(FALSE
);
537 KeReleaseQueuedSpinLock(LockQueueMasterLock
, oldIrql
);
542 CcRosUnmarkDirtyVacb (
547 PROS_SHARED_CACHE_MAP SharedCacheMap
;
549 SharedCacheMap
= Vacb
->SharedCacheMap
;
553 KeAcquireGuardedMutex(&ViewLock
);
554 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
561 RemoveEntryList(&Vacb
->DirtyVacbListEntry
);
562 InitializeListHead(&Vacb
->DirtyVacbListEntry
);
563 CcTotalDirtyPages
-= VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
;
564 Vacb
->SharedCacheMap
->DirtyPages
-= VACB_MAPPING_GRANULARITY
/ PAGE_SIZE
;
565 CcRosVacbDecRefCount(Vacb
);
569 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
570 KeReleaseGuardedMutex(&ViewLock
);
577 PROS_SHARED_CACHE_MAP SharedCacheMap
,
582 ASSERT(SharedCacheMap
);
584 DPRINT("CcRosMarkDirtyVacb(SharedCacheMap 0x%p, FileOffset %I64u)\n",
585 SharedCacheMap
, FileOffset
);
587 Vacb
= CcRosLookupVacb(SharedCacheMap
, FileOffset
);
590 KeBugCheck(CACHE_MANAGER
);
593 CcRosReleaseVacb(SharedCacheMap
, Vacb
, Vacb
->Valid
, TRUE
, FALSE
);
595 return STATUS_SUCCESS
;
599 * Note: this is not the contrary function of
600 * CcRosMapVacbInKernelSpace()
605 PROS_SHARED_CACHE_MAP SharedCacheMap
,
611 ASSERT(SharedCacheMap
);
613 DPRINT("CcRosUnmapVacb(SharedCacheMap 0x%p, FileOffset %I64u, NowDirty %u)\n",
614 SharedCacheMap
, FileOffset
, NowDirty
);
616 Vacb
= CcRosLookupVacb(SharedCacheMap
, FileOffset
);
619 return STATUS_UNSUCCESSFUL
;
622 ASSERT(Vacb
->MappedCount
!= 0);
623 if (InterlockedDecrement((PLONG
)&Vacb
->MappedCount
) == 0)
625 CcRosVacbDecRefCount(Vacb
);
628 CcRosReleaseVacb(SharedCacheMap
, Vacb
, Vacb
->Valid
, NowDirty
, FALSE
);
630 return STATUS_SUCCESS
;
635 CcRosMapVacbInKernelSpace(
640 ULONG_PTR NumberOfPages
;
641 PVOID BaseAddress
= NULL
;
643 /* Create a memory area. */
644 MmLockAddressSpace(MmGetKernelAddressSpace());
645 Status
= MmCreateMemoryArea(MmGetKernelAddressSpace(),
646 0, // nothing checks for VACB mareas, so set to 0
648 VACB_MAPPING_GRANULARITY
,
650 (PMEMORY_AREA
*)&Vacb
->MemoryArea
,
653 ASSERT(Vacb
->BaseAddress
== NULL
);
654 Vacb
->BaseAddress
= BaseAddress
;
655 MmUnlockAddressSpace(MmGetKernelAddressSpace());
656 if (!NT_SUCCESS(Status
))
658 DPRINT1("MmCreateMemoryArea failed with %lx for VACB %p\n", Status
, Vacb
);
662 ASSERT(((ULONG_PTR
)Vacb
->BaseAddress
% PAGE_SIZE
) == 0);
663 ASSERT((ULONG_PTR
)Vacb
->BaseAddress
> (ULONG_PTR
)MmSystemRangeStart
);
664 ASSERT((ULONG_PTR
)Vacb
->BaseAddress
+ VACB_MAPPING_GRANULARITY
- 1 > (ULONG_PTR
)MmSystemRangeStart
);
666 /* Create a virtual mapping for this memory area */
667 NumberOfPages
= BYTES_TO_PAGES(VACB_MAPPING_GRANULARITY
);
668 for (i
= 0; i
< NumberOfPages
; i
++)
670 PFN_NUMBER PageFrameNumber
;
672 MI_SET_USAGE(MI_USAGE_CACHE
);
673 Status
= MmRequestPageMemoryConsumer(MC_CACHE
, TRUE
, &PageFrameNumber
);
674 if (PageFrameNumber
== 0)
676 DPRINT1("Unable to allocate page\n");
677 KeBugCheck(MEMORY_MANAGEMENT
);
680 ASSERT(BaseAddress
== Vacb
->BaseAddress
);
681 ASSERT(i
* PAGE_SIZE
< VACB_MAPPING_GRANULARITY
);
682 ASSERT((ULONG_PTR
)Vacb
->BaseAddress
+ (i
* PAGE_SIZE
) >= (ULONG_PTR
)BaseAddress
);
683 ASSERT((ULONG_PTR
)Vacb
->BaseAddress
+ (i
* PAGE_SIZE
) > (ULONG_PTR
)MmSystemRangeStart
);
685 Status
= MmCreateVirtualMapping(NULL
,
686 (PVOID
)((ULONG_PTR
)Vacb
->BaseAddress
+ (i
* PAGE_SIZE
)),
690 if (!NT_SUCCESS(Status
))
692 DPRINT1("Unable to create virtual mapping\n");
693 KeBugCheck(MEMORY_MANAGEMENT
);
697 return STATUS_SUCCESS
;
703 PROS_SHARED_CACHE_MAP SharedCacheMap
,
709 PLIST_ENTRY current_entry
;
714 ASSERT(SharedCacheMap
);
716 DPRINT("CcRosCreateVacb()\n");
718 if (FileOffset
>= SharedCacheMap
->SectionSize
.QuadPart
)
721 return STATUS_INVALID_PARAMETER
;
724 current
= ExAllocateFromNPagedLookasideList(&VacbLookasideList
);
725 current
->BaseAddress
= NULL
;
726 current
->Valid
= FALSE
;
727 current
->Dirty
= FALSE
;
728 current
->PageOut
= FALSE
;
729 current
->FileOffset
.QuadPart
= ROUND_DOWN(FileOffset
, VACB_MAPPING_GRANULARITY
);
730 current
->SharedCacheMap
= SharedCacheMap
;
732 if (SharedCacheMap
->Trace
)
734 DPRINT1("CacheMap 0x%p: new VACB: 0x%p\n", SharedCacheMap
, current
);
737 current
->MappedCount
= 0;
738 current
->ReferenceCount
= 0;
739 current
->PinCount
= 0;
740 InitializeListHead(¤t
->CacheMapVacbListEntry
);
741 InitializeListHead(¤t
->DirtyVacbListEntry
);
742 InitializeListHead(¤t
->VacbLruListEntry
);
744 CcRosVacbIncRefCount(current
);
746 Status
= CcRosMapVacbInKernelSpace(current
);
747 if (!NT_SUCCESS(Status
))
749 CcRosVacbDecRefCount(current
);
750 ExFreeToNPagedLookasideList(&VacbLookasideList
, current
);
754 KeAcquireGuardedMutex(&ViewLock
);
757 /* There is window between the call to CcRosLookupVacb
758 * and CcRosCreateVacb. We must check if a VACB for the
759 * file offset exist. If there is a VACB, we release
760 * our newly created VACB and return the existing one.
762 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
763 current_entry
= SharedCacheMap
->CacheMapVacbListHead
.Flink
;
765 while (current_entry
!= &SharedCacheMap
->CacheMapVacbListHead
)
767 current
= CONTAINING_RECORD(current_entry
,
769 CacheMapVacbListEntry
);
770 if (IsPointInRange(current
->FileOffset
.QuadPart
,
771 VACB_MAPPING_GRANULARITY
,
774 CcRosVacbIncRefCount(current
);
775 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
777 if (SharedCacheMap
->Trace
)
779 DPRINT1("CacheMap 0x%p: deleting newly created VACB 0x%p ( found existing one 0x%p )\n",
785 KeReleaseGuardedMutex(&ViewLock
);
787 Refs
= CcRosVacbDecRefCount(*Vacb
);
791 return STATUS_SUCCESS
;
793 if (current
->FileOffset
.QuadPart
< FileOffset
)
795 ASSERT(previous
== NULL
||
796 previous
->FileOffset
.QuadPart
< current
->FileOffset
.QuadPart
);
799 if (current
->FileOffset
.QuadPart
> FileOffset
)
801 current_entry
= current_entry
->Flink
;
803 /* There was no existing VACB. */
807 InsertHeadList(&previous
->CacheMapVacbListEntry
, ¤t
->CacheMapVacbListEntry
);
811 InsertHeadList(&SharedCacheMap
->CacheMapVacbListHead
, ¤t
->CacheMapVacbListEntry
);
813 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
814 InsertTailList(&VacbLruListHead
, ¤t
->VacbLruListEntry
);
815 KeReleaseGuardedMutex(&ViewLock
);
817 MI_SET_USAGE(MI_USAGE_CACHE
);
819 if ((SharedCacheMap
->FileObject
) && (SharedCacheMap
->FileObject
->FileName
.Buffer
))
823 pos
= wcsrchr(SharedCacheMap
->FileObject
->FileName
.Buffer
, '\\');
826 len
= wcslen(pos
) * sizeof(WCHAR
);
827 snprintf(MI_PFN_CURRENT_PROCESS_NAME
, min(16, len
), "%S", pos
);
831 snprintf(MI_PFN_CURRENT_PROCESS_NAME
, min(16, len
), "%wZ", &SharedCacheMap
->FileObject
->FileName
);
836 /* Reference it to allow release */
837 CcRosVacbIncRefCount(current
);
845 PROS_SHARED_CACHE_MAP SharedCacheMap
,
847 PLONGLONG BaseOffset
,
856 ASSERT(SharedCacheMap
);
858 DPRINT("CcRosGetVacb()\n");
861 * Look for a VACB already mapping the same data.
863 current
= CcRosLookupVacb(SharedCacheMap
, FileOffset
);
867 * Otherwise create a new VACB.
869 Status
= CcRosCreateVacb(SharedCacheMap
, FileOffset
, ¤t
);
870 if (!NT_SUCCESS(Status
))
876 Refs
= CcRosVacbGetRefCount(current
);
878 KeAcquireGuardedMutex(&ViewLock
);
880 /* Move to the tail of the LRU list */
881 RemoveEntryList(¤t
->VacbLruListEntry
);
882 InsertTailList(&VacbLruListHead
, ¤t
->VacbLruListEntry
);
884 KeReleaseGuardedMutex(&ViewLock
);
887 * Return information about the VACB to the caller.
889 *UptoDate
= current
->Valid
;
890 *BaseAddress
= current
->BaseAddress
;
891 DPRINT("*BaseAddress %p\n", *BaseAddress
);
893 *BaseOffset
= current
->FileOffset
.QuadPart
;
897 return STATUS_SUCCESS
;
903 PROS_SHARED_CACHE_MAP SharedCacheMap
,
909 * FUNCTION: Request a page mapping for a shared cache map
914 ASSERT(SharedCacheMap
);
916 if (FileOffset
% VACB_MAPPING_GRANULARITY
!= 0)
918 DPRINT1("Bad fileoffset %I64x should be multiple of %x",
919 FileOffset
, VACB_MAPPING_GRANULARITY
);
920 KeBugCheck(CACHE_MANAGER
);
923 return CcRosGetVacb(SharedCacheMap
,
935 MEMORY_AREA
* MemoryArea
,
941 ASSERT(SwapEntry
== 0);
944 ASSERT(MmGetReferenceCountPage(Page
) == 1);
945 MmReleasePageMemoryConsumer(MC_CACHE
, Page
);
950 CcRosInternalFreeVacb (
953 * FUNCTION: Releases a VACB associated with a shared cache map
956 DPRINT("Freeing VACB 0x%p\n", Vacb
);
958 if (Vacb
->SharedCacheMap
->Trace
)
960 DPRINT1("CacheMap 0x%p: deleting VACB: 0x%p\n", Vacb
->SharedCacheMap
, Vacb
);
964 MmLockAddressSpace(MmGetKernelAddressSpace());
965 MmFreeMemoryArea(MmGetKernelAddressSpace(),
969 MmUnlockAddressSpace(MmGetKernelAddressSpace());
971 if (Vacb
->PinCount
!= 0 || Vacb
->ReferenceCount
!= 0)
973 DPRINT1("Invalid free: %ld, %ld\n", Vacb
->ReferenceCount
, Vacb
->PinCount
);
974 if (Vacb
->SharedCacheMap
->FileObject
&& Vacb
->SharedCacheMap
->FileObject
->FileName
.Length
)
976 DPRINT1("For file: %wZ\n", &Vacb
->SharedCacheMap
->FileObject
->FileName
);
980 ASSERT(Vacb
->PinCount
== 0);
981 ASSERT(Vacb
->ReferenceCount
== 0);
982 ASSERT(IsListEmpty(&Vacb
->CacheMapVacbListEntry
));
983 ASSERT(IsListEmpty(&Vacb
->DirtyVacbListEntry
));
984 ASSERT(IsListEmpty(&Vacb
->VacbLruListEntry
));
985 RtlFillMemory(Vacb
, sizeof(*Vacb
), 0xfd);
986 ExFreeToNPagedLookasideList(&VacbLookasideList
, Vacb
);
987 return STATUS_SUCCESS
;
996 IN PSECTION_OBJECT_POINTERS SectionObjectPointers
,
997 IN PLARGE_INTEGER FileOffset OPTIONAL
,
999 OUT PIO_STATUS_BLOCK IoStatus
)
1001 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1002 LARGE_INTEGER Offset
;
1003 LONGLONG RemainingLength
;
1007 CCTRACE(CC_API_DEBUG
, "SectionObjectPointers=%p FileOffset=%p Length=%lu\n",
1008 SectionObjectPointers
, FileOffset
, Length
);
1010 DPRINT("CcFlushCache(SectionObjectPointers 0x%p, FileOffset 0x%p, Length %lu, IoStatus 0x%p)\n",
1011 SectionObjectPointers
, FileOffset
, Length
, IoStatus
);
1013 if (SectionObjectPointers
&& SectionObjectPointers
->SharedCacheMap
)
1015 SharedCacheMap
= SectionObjectPointers
->SharedCacheMap
;
1016 ASSERT(SharedCacheMap
);
1019 Offset
= *FileOffset
;
1020 RemainingLength
= Length
;
1024 Offset
.QuadPart
= 0;
1025 RemainingLength
= SharedCacheMap
->FileSize
.QuadPart
;
1030 IoStatus
->Status
= STATUS_SUCCESS
;
1031 IoStatus
->Information
= 0;
1034 while (RemainingLength
> 0)
1036 current
= CcRosLookupVacb(SharedCacheMap
, Offset
.QuadPart
);
1037 if (current
!= NULL
)
1041 Status
= CcRosFlushVacb(current
);
1042 if (!NT_SUCCESS(Status
) && IoStatus
!= NULL
)
1044 IoStatus
->Status
= Status
;
1048 CcRosReleaseVacb(SharedCacheMap
, current
, current
->Valid
, current
->Dirty
, FALSE
);
1051 Offset
.QuadPart
+= VACB_MAPPING_GRANULARITY
;
1052 RemainingLength
-= min(RemainingLength
, VACB_MAPPING_GRANULARITY
);
1059 IoStatus
->Status
= STATUS_INVALID_PARAMETER
;
1066 CcRosDeleteFileCache (
1067 PFILE_OBJECT FileObject
,
1068 PROS_SHARED_CACHE_MAP SharedCacheMap
)
1070 * FUNCTION: Releases the shared cache map associated with a file object
1073 PLIST_ENTRY current_entry
;
1075 LIST_ENTRY FreeList
;
1078 ASSERT(SharedCacheMap
);
1080 SharedCacheMap
->OpenCount
++;
1081 KeReleaseGuardedMutex(&ViewLock
);
1083 CcFlushCache(FileObject
->SectionObjectPointer
, NULL
, 0, NULL
);
1085 KeAcquireGuardedMutex(&ViewLock
);
1086 SharedCacheMap
->OpenCount
--;
1087 if (SharedCacheMap
->OpenCount
== 0)
1091 FileObject
->SectionObjectPointer
->SharedCacheMap
= NULL
;
1096 InitializeListHead(&FreeList
);
1097 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
1098 while (!IsListEmpty(&SharedCacheMap
->CacheMapVacbListHead
))
1100 current_entry
= RemoveTailList(&SharedCacheMap
->CacheMapVacbListHead
);
1101 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
1103 current
= CONTAINING_RECORD(current_entry
, ROS_VACB
, CacheMapVacbListEntry
);
1104 RemoveEntryList(¤t
->VacbLruListEntry
);
1105 InitializeListHead(¤t
->VacbLruListEntry
);
1108 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
1109 CcRosUnmarkDirtyVacb(current
, FALSE
);
1110 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
1111 DPRINT1("Freeing dirty VACB\n");
1113 if (current
->MappedCount
!= 0)
1115 current
->MappedCount
= 0;
1116 NT_VERIFY(CcRosVacbDecRefCount(current
) > 0);
1117 DPRINT1("Freeing mapped VACB\n");
1119 InsertHeadList(&FreeList
, ¤t
->CacheMapVacbListEntry
);
1121 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &oldIrql
);
1124 SharedCacheMap
->Trace
= FALSE
;
1126 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, oldIrql
);
1128 KeReleaseGuardedMutex(&ViewLock
);
1129 ObDereferenceObject(SharedCacheMap
->FileObject
);
1131 while (!IsListEmpty(&FreeList
))
1135 current_entry
= RemoveTailList(&FreeList
);
1136 current
= CONTAINING_RECORD(current_entry
, ROS_VACB
, CacheMapVacbListEntry
);
1137 InitializeListHead(¤t
->CacheMapVacbListEntry
);
1138 Refs
= CcRosVacbDecRefCount(current
);
1139 #if DBG // CORE-14578
1142 DPRINT1("Leaking VACB %p attached to %p (%I64d)\n", current
, FileObject
, current
->FileOffset
.QuadPart
);
1143 DPRINT1("There are: %d references left\n", Refs
);
1144 DPRINT1("Pin: %d, Map: %d\n", current
->PinCount
, current
->MappedCount
);
1145 DPRINT1("Dirty: %d\n", current
->Dirty
);
1146 if (FileObject
->FileName
.Length
!= 0)
1148 DPRINT1("File was: %wZ\n", &FileObject
->FileName
);
1150 else if (FileObject
->FsContext
!= NULL
&&
1151 ((PFSRTL_COMMON_FCB_HEADER
)(FileObject
->FsContext
))->NodeTypeCode
== 0x0502 &&
1152 ((PFSRTL_COMMON_FCB_HEADER
)(FileObject
->FsContext
))->NodeByteSize
== 0x1F8 &&
1153 ((PUNICODE_STRING
)(((PUCHAR
)FileObject
->FsContext
) + 0x100))->Length
!= 0)
1155 DPRINT1("File was: %wZ (FastFAT)\n", (PUNICODE_STRING
)(((PUCHAR
)FileObject
->FsContext
) + 0x100));
1159 DPRINT1("No name for the file\n");
1167 OldIrql
= KeAcquireQueuedSpinLock(LockQueueMasterLock
);
1168 RemoveEntryList(&SharedCacheMap
->SharedCacheMapLinks
);
1169 KeReleaseQueuedSpinLock(LockQueueMasterLock
, OldIrql
);
1171 ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList
, SharedCacheMap
);
1172 KeAcquireGuardedMutex(&ViewLock
);
1174 return STATUS_SUCCESS
;
1179 CcRosReferenceCache (
1180 PFILE_OBJECT FileObject
)
1182 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1183 KeAcquireGuardedMutex(&ViewLock
);
1184 SharedCacheMap
= FileObject
->SectionObjectPointer
->SharedCacheMap
;
1185 ASSERT(SharedCacheMap
);
1186 ASSERT(SharedCacheMap
->OpenCount
!= 0);
1187 SharedCacheMap
->OpenCount
++;
1188 KeReleaseGuardedMutex(&ViewLock
);
1193 CcRosRemoveIfClosed (
1194 PSECTION_OBJECT_POINTERS SectionObjectPointer
)
1196 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1197 DPRINT("CcRosRemoveIfClosed()\n");
1198 KeAcquireGuardedMutex(&ViewLock
);
1199 SharedCacheMap
= SectionObjectPointer
->SharedCacheMap
;
1200 if (SharedCacheMap
&& SharedCacheMap
->OpenCount
== 0)
1202 CcRosDeleteFileCache(SharedCacheMap
->FileObject
, SharedCacheMap
);
1204 KeReleaseGuardedMutex(&ViewLock
);
1210 CcRosDereferenceCache (
1211 PFILE_OBJECT FileObject
)
1213 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1214 KeAcquireGuardedMutex(&ViewLock
);
1215 SharedCacheMap
= FileObject
->SectionObjectPointer
->SharedCacheMap
;
1216 ASSERT(SharedCacheMap
);
1217 if (SharedCacheMap
->OpenCount
> 0)
1219 SharedCacheMap
->OpenCount
--;
1220 if (SharedCacheMap
->OpenCount
== 0)
1222 MmFreeSectionSegments(SharedCacheMap
->FileObject
);
1223 CcRosDeleteFileCache(FileObject
, SharedCacheMap
);
1226 KeReleaseGuardedMutex(&ViewLock
);
1231 CcRosReleaseFileCache (
1232 PFILE_OBJECT FileObject
)
1234 * FUNCTION: Called by the file system when a handle to a file object
1239 PPRIVATE_CACHE_MAP PrivateMap
;
1240 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1242 KeAcquireGuardedMutex(&ViewLock
);
1244 if (FileObject
->SectionObjectPointer
->SharedCacheMap
!= NULL
)
1246 SharedCacheMap
= FileObject
->SectionObjectPointer
->SharedCacheMap
;
1248 /* Closing the handle, so kill the private cache map
1249 * Before you event try to remove it from FO, always
1250 * lock the master lock, to be sure not to race
1251 * with a potential read ahead ongoing!
1253 OldIrql
= KeAcquireQueuedSpinLock(LockQueueMasterLock
);
1254 PrivateMap
= FileObject
->PrivateCacheMap
;
1255 FileObject
->PrivateCacheMap
= NULL
;
1256 KeReleaseQueuedSpinLock(LockQueueMasterLock
, OldIrql
);
1258 if (PrivateMap
!= NULL
)
1260 /* Remove it from the file */
1261 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &OldIrql
);
1262 RemoveEntryList(&PrivateMap
->PrivateLinks
);
1263 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, OldIrql
);
1266 if (PrivateMap
!= &SharedCacheMap
->PrivateCacheMap
)
1268 ExFreePoolWithTag(PrivateMap
, TAG_PRIVATE_CACHE_MAP
);
1272 PrivateMap
->NodeTypeCode
= 0;
1275 if (SharedCacheMap
->OpenCount
> 0)
1277 SharedCacheMap
->OpenCount
--;
1278 if (SharedCacheMap
->OpenCount
== 0)
1280 MmFreeSectionSegments(SharedCacheMap
->FileObject
);
1281 CcRosDeleteFileCache(FileObject
, SharedCacheMap
);
1286 KeReleaseGuardedMutex(&ViewLock
);
1287 return STATUS_SUCCESS
;
1292 CcRosInitializeFileCache (
1293 PFILE_OBJECT FileObject
,
1294 PCC_FILE_SIZES FileSizes
,
1296 PCACHE_MANAGER_CALLBACKS CallBacks
,
1297 PVOID LazyWriterContext
)
1299 * FUNCTION: Initializes a shared cache map for a file object
1304 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1306 SharedCacheMap
= FileObject
->SectionObjectPointer
->SharedCacheMap
;
1307 DPRINT("CcRosInitializeFileCache(FileObject 0x%p, SharedCacheMap 0x%p)\n",
1308 FileObject
, SharedCacheMap
);
1311 KeAcquireGuardedMutex(&ViewLock
);
1312 if (SharedCacheMap
== NULL
)
1315 SharedCacheMap
= ExAllocateFromNPagedLookasideList(&SharedCacheMapLookasideList
);
1316 if (SharedCacheMap
== NULL
)
1318 KeReleaseGuardedMutex(&ViewLock
);
1319 return STATUS_INSUFFICIENT_RESOURCES
;
1321 RtlZeroMemory(SharedCacheMap
, sizeof(*SharedCacheMap
));
1322 ObReferenceObjectByPointer(FileObject
,
1326 SharedCacheMap
->NodeTypeCode
= NODE_TYPE_SHARED_MAP
;
1327 SharedCacheMap
->NodeByteSize
= sizeof(*SharedCacheMap
);
1328 SharedCacheMap
->FileObject
= FileObject
;
1329 SharedCacheMap
->Callbacks
= CallBacks
;
1330 SharedCacheMap
->LazyWriteContext
= LazyWriterContext
;
1331 SharedCacheMap
->SectionSize
= FileSizes
->AllocationSize
;
1332 SharedCacheMap
->FileSize
= FileSizes
->FileSize
;
1333 SharedCacheMap
->PinAccess
= PinAccess
;
1334 SharedCacheMap
->DirtyPageThreshold
= 0;
1335 SharedCacheMap
->DirtyPages
= 0;
1336 InitializeListHead(&SharedCacheMap
->PrivateList
);
1337 KeInitializeSpinLock(&SharedCacheMap
->CacheMapLock
);
1338 InitializeListHead(&SharedCacheMap
->CacheMapVacbListHead
);
1339 FileObject
->SectionObjectPointer
->SharedCacheMap
= SharedCacheMap
;
1341 OldIrql
= KeAcquireQueuedSpinLock(LockQueueMasterLock
);
1342 InsertTailList(&CcCleanSharedCacheMapList
, &SharedCacheMap
->SharedCacheMapLinks
);
1343 KeReleaseQueuedSpinLock(LockQueueMasterLock
, OldIrql
);
1345 if (FileObject
->PrivateCacheMap
== NULL
)
1347 PPRIVATE_CACHE_MAP PrivateMap
;
1349 /* Allocate the private cache map for this handle */
1350 if (SharedCacheMap
->PrivateCacheMap
.NodeTypeCode
!= 0)
1352 PrivateMap
= ExAllocatePoolWithTag(NonPagedPool
, sizeof(PRIVATE_CACHE_MAP
), TAG_PRIVATE_CACHE_MAP
);
1356 PrivateMap
= &SharedCacheMap
->PrivateCacheMap
;
1359 if (PrivateMap
== NULL
)
1361 /* If we also allocated the shared cache map for this file, kill it */
1364 OldIrql
= KeAcquireQueuedSpinLock(LockQueueMasterLock
);
1365 RemoveEntryList(&SharedCacheMap
->SharedCacheMapLinks
);
1366 KeReleaseQueuedSpinLock(LockQueueMasterLock
, OldIrql
);
1368 FileObject
->SectionObjectPointer
->SharedCacheMap
= NULL
;
1369 ObDereferenceObject(FileObject
);
1370 ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList
, SharedCacheMap
);
1373 KeReleaseGuardedMutex(&ViewLock
);
1374 return STATUS_INSUFFICIENT_RESOURCES
;
1378 RtlZeroMemory(PrivateMap
, sizeof(PRIVATE_CACHE_MAP
));
1379 PrivateMap
->NodeTypeCode
= NODE_TYPE_PRIVATE_MAP
;
1380 PrivateMap
->ReadAheadMask
= PAGE_SIZE
- 1;
1381 PrivateMap
->FileObject
= FileObject
;
1382 KeInitializeSpinLock(&PrivateMap
->ReadAheadSpinLock
);
1384 /* Link it to the file */
1385 KeAcquireSpinLock(&SharedCacheMap
->CacheMapLock
, &OldIrql
);
1386 InsertTailList(&SharedCacheMap
->PrivateList
, &PrivateMap
->PrivateLinks
);
1387 KeReleaseSpinLock(&SharedCacheMap
->CacheMapLock
, OldIrql
);
1389 FileObject
->PrivateCacheMap
= PrivateMap
;
1390 SharedCacheMap
->OpenCount
++;
1392 KeReleaseGuardedMutex(&ViewLock
);
1394 return STATUS_SUCCESS
;
1402 CcGetFileObjectFromSectionPtrs (
1403 IN PSECTION_OBJECT_POINTERS SectionObjectPointers
)
1405 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1407 CCTRACE(CC_API_DEBUG
, "SectionObjectPointers=%p\n", SectionObjectPointers
);
1409 if (SectionObjectPointers
&& SectionObjectPointers
->SharedCacheMap
)
1411 SharedCacheMap
= SectionObjectPointers
->SharedCacheMap
;
1412 ASSERT(SharedCacheMap
);
1413 return SharedCacheMap
->FileObject
;
1424 DPRINT("CcInitView()\n");
1426 InitializeListHead(&DirtyVacbListHead
);
1427 InitializeListHead(&VacbLruListHead
);
1428 InitializeListHead(&CcDeferredWrites
);
1429 InitializeListHead(&CcCleanSharedCacheMapList
);
1430 KeInitializeSpinLock(&CcDeferredWriteSpinLock
);
1431 KeInitializeGuardedMutex(&ViewLock
);
1432 ExInitializeNPagedLookasideList(&iBcbLookasideList
,
1436 sizeof(INTERNAL_BCB
),
1439 ExInitializeNPagedLookasideList(&SharedCacheMapLookasideList
,
1443 sizeof(ROS_SHARED_CACHE_MAP
),
1444 TAG_SHARED_CACHE_MAP
,
1446 ExInitializeNPagedLookasideList(&VacbLookasideList
,
1454 MmInitializeMemoryConsumer(MC_CACHE
, CcRosTrimCache
);
1456 CcInitCacheZeroPage();
1459 #if DBG && defined(KDBG)
1461 ExpKdbgExtFileCache(ULONG Argc
, PCHAR Argv
[])
1463 PLIST_ENTRY ListEntry
;
1464 UNICODE_STRING NoName
= RTL_CONSTANT_STRING(L
"No name for File");
1466 KdbpPrint(" Usage Summary (in kb)\n");
1467 KdbpPrint("Shared\t\tValid\tDirty\tName\n");
1468 /* No need to lock the spin lock here, we're in DBG */
1469 for (ListEntry
= CcCleanSharedCacheMapList
.Flink
;
1470 ListEntry
!= &CcCleanSharedCacheMapList
;
1471 ListEntry
= ListEntry
->Flink
)
1474 ULONG Valid
= 0, Dirty
= 0;
1475 PROS_SHARED_CACHE_MAP SharedCacheMap
;
1476 PUNICODE_STRING FileName
;
1479 SharedCacheMap
= CONTAINING_RECORD(ListEntry
, ROS_SHARED_CACHE_MAP
, SharedCacheMapLinks
);
1482 Dirty
= (SharedCacheMap
->DirtyPages
* PAGE_SIZE
) / 1024;
1484 /* First, count for all the associated VACB */
1485 for (Vacbs
= SharedCacheMap
->CacheMapVacbListHead
.Flink
;
1486 Vacbs
!= &SharedCacheMap
->CacheMapVacbListHead
;
1487 Vacbs
= Vacbs
->Flink
)
1491 Vacb
= CONTAINING_RECORD(Vacbs
, ROS_VACB
, CacheMapVacbListEntry
);
1494 Valid
+= VACB_MAPPING_GRANULARITY
/ 1024;
1499 if (SharedCacheMap
->FileObject
!= NULL
&&
1500 SharedCacheMap
->FileObject
->FileName
.Length
!= 0)
1502 FileName
= &SharedCacheMap
->FileObject
->FileName
;
1504 else if (SharedCacheMap
->FileObject
!= NULL
&&
1505 SharedCacheMap
->FileObject
->FsContext
!= NULL
&&
1506 ((PFSRTL_COMMON_FCB_HEADER
)(SharedCacheMap
->FileObject
->FsContext
))->NodeTypeCode
== 0x0502 &&
1507 ((PFSRTL_COMMON_FCB_HEADER
)(SharedCacheMap
->FileObject
->FsContext
))->NodeByteSize
== 0x1F8 &&
1508 ((PUNICODE_STRING
)(((PUCHAR
)SharedCacheMap
->FileObject
->FsContext
) + 0x100))->Length
!= 0)
1510 FileName
= (PUNICODE_STRING
)(((PUCHAR
)SharedCacheMap
->FileObject
->FsContext
) + 0x100);
1511 Extra
= L
" (FastFAT)";
1519 KdbpPrint("%p\t%d\t%d\t%wZ%S\n", SharedCacheMap
, Valid
, Dirty
, FileName
, Extra
);
1526 ExpKdbgExtDefWrites(ULONG Argc
, PCHAR Argv
[])
1528 KdbpPrint("CcTotalDirtyPages:\t%lu (%lu Kb)\n", CcTotalDirtyPages
,
1529 (CcTotalDirtyPages
* PAGE_SIZE
) / 1024);
1530 KdbpPrint("CcDirtyPageThreshold:\t%lu (%lu Kb)\n", CcDirtyPageThreshold
,
1531 (CcDirtyPageThreshold
* PAGE_SIZE
) / 1024);
1532 KdbpPrint("MmAvailablePages:\t%lu (%lu Kb)\n", MmAvailablePages
,
1533 (MmAvailablePages
* PAGE_SIZE
) / 1024);
1534 KdbpPrint("MmThrottleTop:\t\t%lu (%lu Kb)\n", MmThrottleTop
,
1535 (MmThrottleTop
* PAGE_SIZE
) / 1024);
1536 KdbpPrint("MmThrottleBottom:\t%lu (%lu Kb)\n", MmThrottleBottom
,
1537 (MmThrottleBottom
* PAGE_SIZE
) / 1024);
1538 KdbpPrint("MmModifiedPageListHead.Total:\t%lu (%lu Kb)\n", MmModifiedPageListHead
.Total
,
1539 (MmModifiedPageListHead
.Total
* PAGE_SIZE
) / 1024);
1541 if (CcTotalDirtyPages
>= CcDirtyPageThreshold
)
1543 KdbpPrint("CcTotalDirtyPages above the threshold, writes should be throttled\n");
1545 else if (CcTotalDirtyPages
+ 64 >= CcDirtyPageThreshold
)
1547 KdbpPrint("CcTotalDirtyPages within 64 (max charge) pages of the threshold, writes may be throttled\n");
1551 KdbpPrint("CcTotalDirtyPages below the threshold, writes should not be throttled\n");