reactos/ntoskrnl/cc/cacheman.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/cc/cacheman.c
* PURPOSE: Cache manager
*
* PROGRAMMERS: David Welch (welch@cwcom.net)
* Pierre Schweitzer (pierre@reactos.org)
*/
/* INCLUDES *****************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
BOOLEAN CcPfEnablePrefetcher;
PFSN_PREFETCHER_GLOBALS CcPfGlobals;
MM_SYSTEMSIZE CcCapturedSystemSize;
static ULONG BugCheckFileId = 0x4 << 16;
/* FUNCTIONS *****************************************************************/
INIT_FUNCTION
VOID
NTAPI
CcPfInitializePrefetcher(VOID)
{
/* Notify debugger */
DbgPrintEx(DPFLTR_PREFETCHER_ID,
DPFLTR_TRACE_LEVEL,
"CCPF: InitializePrefetecher()\n");
/* Setup the Prefetcher Data */
InitializeListHead(&CcPfGlobals.ActiveTraces);
InitializeListHead(&CcPfGlobals.CompletedTraces);
ExInitializeFastMutex(&CcPfGlobals.CompletedTracesLock);
/* FIXME: Setup the rest of the prefetecher */
}
INIT_FUNCTION
BOOLEAN
NTAPI
CcInitializeCacheManager(VOID)
{
ULONG Thread;
CcInitView();
/* Initialize lazy-writer lists */
InitializeListHead(&CcIdleWorkerThreadList);
InitializeListHead(&CcExpressWorkQueue);
InitializeListHead(&CcRegularWorkQueue);
InitializeListHead(&CcPostTickWorkQueue);
/* Define lazy writer threshold and the amount of workers,
* depending on the system type
*/
CcCapturedSystemSize = MmQuerySystemSize();
switch (CcCapturedSystemSize)
{
case MmSmallSystem:
CcNumberWorkerThreads = ExCriticalWorkerThreads - 1;
CcDirtyPageThreshold = MmNumberOfPhysicalPages / 8;
break;
case MmMediumSystem:
CcNumberWorkerThreads = ExCriticalWorkerThreads - 1;
CcDirtyPageThreshold = MmNumberOfPhysicalPages / 4;
break;
case MmLargeSystem:
CcNumberWorkerThreads = ExCriticalWorkerThreads - 2;
CcDirtyPageThreshold = MmNumberOfPhysicalPages / 8 + MmNumberOfPhysicalPages / 4;
break;
default:
CcNumberWorkerThreads = 1;
CcDirtyPageThreshold = MmNumberOfPhysicalPages / 8;
break;
}
/* Allocate a work item for all our threads */
for (Thread = 0; Thread < CcNumberWorkerThreads; ++Thread)
{
PWORK_QUEUE_ITEM Item;
Item = ExAllocatePoolWithTag(NonPagedPool, sizeof(WORK_QUEUE_ITEM), 'qWcC');
if (Item == NULL)
{
CcBugCheck(0, 0, 0);
}
/* By default, it's obviously idle */
ExInitializeWorkItem(Item, CcWorkerThread, Item);
InsertTailList(&CcIdleWorkerThreadList, &Item->List);
}
/* Initialize our lazy writer */
RtlZeroMemory(&LazyWriter, sizeof(LazyWriter));
InitializeListHead(&LazyWriter.WorkQueue);
/* Delay activation of the lazy writer */
KeInitializeDpc(&LazyWriter.ScanDpc, CcScanDpc, NULL);
KeInitializeTimer(&LazyWriter.ScanTimer);
/* Lookaside list for our work items */
ExInitializeNPagedLookasideList(&CcTwilightLookasideList, NULL, NULL, 0, sizeof(WORK_QUEUE_ENTRY), 'KWcC', 0);
return TRUE;
}
VOID
NTAPI
CcShutdownSystem(VOID)
{
/* NOTHING TO DO */
}
/*
* @unimplemented
*/
LARGE_INTEGER
NTAPI
CcGetFlushedValidData (
IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
IN BOOLEAN BcbListHeld
)
{
LARGE_INTEGER i;
UNIMPLEMENTED;
i.QuadPart = 0;
return i;
}
/*
* @unimplemented
*/
PVOID
NTAPI
CcRemapBcb (
IN PVOID Bcb
)
{
UNIMPLEMENTED;
return 0;
}
/*
* @unimplemented
*/
VOID
NTAPI
CcScheduleReadAhead (
IN PFILE_OBJECT FileObject,
IN PLARGE_INTEGER FileOffset,
IN ULONG Length
)
{
KIRQL OldIrql;
LARGE_INTEGER NewOffset;
PROS_SHARED_CACHE_MAP SharedCacheMap;
PPRIVATE_CACHE_MAP PrivateCacheMap;
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
PrivateCacheMap = FileObject->PrivateCacheMap;
/* If file isn't cached, or if read ahead is disabled, this is no op */
if (SharedCacheMap == NULL || PrivateCacheMap == NULL ||
BooleanFlagOn(SharedCacheMap->Flags, READAHEAD_DISABLED))
{
return;
}
/* Round read length with read ahead mask */
Length = ROUND_UP(Length, PrivateCacheMap->ReadAheadMask + 1);
/* Compute the offset we'll reach */
NewOffset.QuadPart = FileOffset->QuadPart + Length;
/* Lock read ahead spin lock */
KeAcquireSpinLock(&PrivateCacheMap->ReadAheadSpinLock, &OldIrql);
/* Easy case: the file is sequentially read */
if (BooleanFlagOn(FileObject->Flags, FO_SEQUENTIAL_ONLY))
{
/* If we went backward, this is no go! */
if (NewOffset.QuadPart < PrivateCacheMap->ReadAheadOffset[1].QuadPart)
{
KeReleaseSpinLock(&PrivateCacheMap->ReadAheadSpinLock, OldIrql);
return;
}
/* FIXME: hackish, but will do the job for now */
PrivateCacheMap->ReadAheadOffset[1].QuadPart = NewOffset.QuadPart;
PrivateCacheMap->ReadAheadLength[1] = Length;
}
/* Other cases: try to find some logic in that mess... */
else
{
/* Let's check if we always read the same way (like going down in the file)
* and pretend it's enough for now
*/
if (PrivateCacheMap->FileOffset2.QuadPart >= PrivateCacheMap->FileOffset1.QuadPart &&
FileOffset->QuadPart >= PrivateCacheMap->FileOffset2.QuadPart)
{
/* FIXME: hackish, but will do the job for now */
PrivateCacheMap->ReadAheadOffset[1].QuadPart = NewOffset.QuadPart;
PrivateCacheMap->ReadAheadLength[1] = Length;
}
else
{
/* FIXME: handle the other cases */
KeReleaseSpinLock(&PrivateCacheMap->ReadAheadSpinLock, OldIrql);
UNIMPLEMENTED_ONCE;
return;
}
}
/* If read ahead isn't active yet */
if (!PrivateCacheMap->Flags.ReadAheadActive)
{
PWORK_QUEUE_ENTRY WorkItem;
/* It's active now!
* Be careful with the mask, you don't want to mess with node code
*/
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InterlockedOr((volatile long *)&PrivateCacheMap->UlongFlags, PRIVATE_CACHE_MAP_READ_AHEAD_ACTIVE);
KeReleaseSpinLock(&PrivateCacheMap->ReadAheadSpinLock, OldIrql);
/* Get a work item */
WorkItem = ExAllocateFromNPagedLookasideList(&CcTwilightLookasideList);
if (WorkItem != NULL)
{
/* Reference our FO so that it doesn't go in between */
ObReferenceObject(FileObject);
/* We want to do read ahead! */
WorkItem->Function = ReadAhead;
WorkItem->Parameters.Read.FileObject = FileObject;
/* Queue in the read ahead dedicated queue */
CcPostWorkQueue(WorkItem, &CcExpressWorkQueue);
return;
}
/* Fail path: lock again, and revert read ahead active */
KeAcquireSpinLock(&PrivateCacheMap->ReadAheadSpinLock, &OldIrql);
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InterlockedAnd((volatile long *)&PrivateCacheMap->UlongFlags, ~PRIVATE_CACHE_MAP_READ_AHEAD_ACTIVE);
}
/* Done (fail) */
KeReleaseSpinLock(&PrivateCacheMap->ReadAheadSpinLock, OldIrql);
}
/*
* @implemented
*/
VOID
NTAPI
CcSetAdditionalCacheAttributes (
IN PFILE_OBJECT FileObject,
IN BOOLEAN DisableReadAhead,
IN BOOLEAN DisableWriteBehind
)
{
KIRQL OldIrql;
PROS_SHARED_CACHE_MAP SharedCacheMap;
CCTRACE(CC_API_DEBUG, "FileObject=%p DisableReadAhead=%d DisableWriteBehind=%d\n",
FileObject, DisableReadAhead, DisableWriteBehind);
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
if (DisableReadAhead)
{
SetFlag(SharedCacheMap->Flags, READAHEAD_DISABLED);
}
else
{
ClearFlag(SharedCacheMap->Flags, READAHEAD_DISABLED);
}
if (DisableWriteBehind)
{
/* FIXME: also set flag 0x200 */
SetFlag(SharedCacheMap->Flags, WRITEBEHIND_DISABLED);
}
else
{
ClearFlag(SharedCacheMap->Flags, WRITEBEHIND_DISABLED);
}
KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
}
/*
* @unimplemented
*/
VOID
NTAPI
CcSetBcbOwnerPointer (
IN PVOID Bcb,
IN PVOID Owner
)
{
PINTERNAL_BCB iBcb = Bcb;
CCTRACE(CC_API_DEBUG, "Bcb=%p Owner=%p\n",
Bcb, Owner);
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if (!ExIsResourceAcquiredExclusiveLite(&iBcb->Lock) && !ExIsResourceAcquiredSharedLite(&iBcb->Lock))
{
DPRINT1("Current thread doesn't own resource!\n");
return;
}
ExSetResourceOwnerPointer(&iBcb->Lock, Owner);
}
/*
* @implemented
*/
VOID
NTAPI
CcSetDirtyPageThreshold (
IN PFILE_OBJECT FileObject,
IN ULONG DirtyPageThreshold
)
{
PFSRTL_COMMON_FCB_HEADER Fcb;
PROS_SHARED_CACHE_MAP SharedCacheMap;
CCTRACE(CC_API_DEBUG, "FileObject=%p DirtyPageThreshold=%lu\n",
FileObject, DirtyPageThreshold);
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
if (SharedCacheMap != NULL)
{
SharedCacheMap->DirtyPageThreshold = DirtyPageThreshold;
}
Fcb = FileObject->FsContext;
if (!BooleanFlagOn(Fcb->Flags, FSRTL_FLAG_LIMIT_MODIFIED_PAGES))
{
SetFlag(Fcb->Flags, FSRTL_FLAG_LIMIT_MODIFIED_PAGES);
}
}
/*
* @implemented
*/
VOID
NTAPI
CcSetReadAheadGranularity (
IN PFILE_OBJECT FileObject,
IN ULONG Granularity
)
{
PPRIVATE_CACHE_MAP PrivateMap;
CCTRACE(CC_API_DEBUG, "FileObject=%p Granularity=%lu\n",
FileObject, Granularity);
PrivateMap = FileObject->PrivateCacheMap;
PrivateMap->ReadAheadMask = Granularity - 1;
}