pin.c File Reference

#include <ntoskrnl.h>
#include <debug.h>

Include dependency graph for pin.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
static PINTERNAL_BCB NTAPI	CcpFindBcb (IN PROS_SHARED_CACHE_MAP SharedCacheMap, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN BOOLEAN Pinned)
static VOID	CcpDereferenceBcb (IN PROS_SHARED_CACHE_MAP SharedCacheMap, IN PINTERNAL_BCB Bcb)
static PVOID	CcpGetAppropriateBcb (IN PROS_SHARED_CACHE_MAP SharedCacheMap, IN PROS_VACB Vacb, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN ULONG PinFlags, IN BOOLEAN ToPin)
static BOOLEAN	CcpPinData (IN PROS_SHARED_CACHE_MAP SharedCacheMap, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN ULONG Flags, OUT PVOID *Bcb, OUT PVOID *Buffer)
BOOLEAN NTAPI	CcMapData (IN PFILE_OBJECT FileObject, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN ULONG Flags, OUT PVOID *pBcb, OUT PVOID *pBuffer)
BOOLEAN NTAPI	CcPinMappedData (IN PFILE_OBJECT FileObject, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN ULONG Flags, OUT PVOID *Bcb)
BOOLEAN NTAPI	CcPinRead (IN PFILE_OBJECT FileObject, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN ULONG Flags, OUT PVOID *Bcb, OUT PVOID *Buffer)
BOOLEAN NTAPI	CcPreparePinWrite (IN PFILE_OBJECT FileObject, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN BOOLEAN Zero, IN ULONG Flags, OUT PVOID *Bcb, OUT PVOID *Buffer)
VOID NTAPI	CcSetDirtyPinnedData (IN PVOID Bcb, IN PLARGE_INTEGER Lsn)
VOID NTAPI	CcUnpinData (IN PVOID Bcb)
VOID NTAPI	CcUnpinDataForThread (IN PVOID Bcb, IN ERESOURCE_THREAD ResourceThreadId)
VOID NTAPI	CcRepinBcb (IN PVOID Bcb)
VOID NTAPI	CcUnpinRepinnedBcb (IN PVOID Bcb, IN BOOLEAN WriteThrough, IN PIO_STATUS_BLOCK IoStatus)

Variables
NPAGED_LOOKASIDE_LIST	iBcbLookasideList
ULONG	CcMapDataWait = 0
ULONG	CcMapDataNoWait = 0
ULONG	CcPinReadWait = 0
ULONG	CcPinReadNoWait = 0
ULONG	CcPinMappedDataCount = 0

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 14 of file pin.c.

Function Documentation

CcMapData()

BOOLEAN NTAPI CcMapData	(	IN PFILE_OBJECT	FileObject,
		IN PLARGE_INTEGER	FileOffset,
		IN ULONG	Length,
		IN ULONG	Flags,
		OUT PVOID *	pBcb,
		OUT PVOID *	pBuffer
	)

Definition at line 321 of file pin.c.

{
    KIRQL OldIrql;
    PINTERNAL_BCB iBcb;
    PROS_VACB Vacb;
    PROS_SHARED_CACHE_MAP SharedCacheMap;
    ULONG VacbOffset;
    NTSTATUS Status;
    BOOLEAN Result;

    CCTRACE(CC_API_DEBUG, "CcMapData(FileObject 0x%p, FileOffset 0x%I64x, Length %lu, Flags 0x%lx,"
           " pBcb 0x%p, pBuffer 0x%p)\n", FileObject, FileOffset->QuadPart,
           Length, Flags, pBcb, pBuffer);

    ASSERT(FileObject);
    ASSERT(FileObject->SectionObjectPointer);
    ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);

    SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
    ASSERT(SharedCacheMap);

    if (Flags & MAP_WAIT)
    {
        ++CcMapDataWait;
    }
    else
    {
        ++CcMapDataNoWait;
    }

    VacbOffset = (ULONG)(FileOffset->QuadPart % VACB_MAPPING_GRANULARITY);
    /* KMTests seem to show that it is allowed to call accross mapping granularity */
    if ((VacbOffset + Length) > VACB_MAPPING_GRANULARITY)
    {
        DPRINT1("TRUNCATING DATA MAP FROM %lu to %lu!\n", Length, VACB_MAPPING_GRANULARITY - VacbOffset);
        Length = VACB_MAPPING_GRANULARITY - VacbOffset;
    }

    KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
    iBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, FALSE);

    if (iBcb == NULL)
    {
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);

        /* Call internal helper for getting a VACB */
        Status = CcRosGetVacb(SharedCacheMap, FileOffset->QuadPart, &Vacb);
        if (!NT_SUCCESS(Status))
        {
            CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
                SharedCacheMap->FileObject, FileOffset, Length, Flags);
            ExRaiseStatus(Status);
        }

        iBcb = CcpGetAppropriateBcb(SharedCacheMap, Vacb, FileOffset, Length, 0, FALSE);
        if (iBcb == NULL)
        {
            CcRosReleaseVacb(SharedCacheMap, Vacb, FALSE, FALSE);
            CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
                SharedCacheMap->FileObject, FileOffset, Length, Flags);
            *pBcb = NULL; // If you ever remove this for compat, make sure to review all callers for using an unititialized value
            ExRaiseStatus(STATUS_INSUFFICIENT_RESOURCES);
        }
    }
    else
    {
        ++iBcb->RefCount;
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
    }

    _SEH2_TRY
    {
        Result = FALSE;
        /* Ensure the pages are resident */
        Result = CcRosEnsureVacbResident(iBcb->Vacb, BooleanFlagOn(Flags, MAP_WAIT),
                BooleanFlagOn(Flags, MAP_NO_READ), VacbOffset, Length);
    }
    _SEH2_FINALLY
    {
        if (!Result)
        {
            CcpDereferenceBcb(SharedCacheMap, iBcb);
            return FALSE;
        }
    }
    _SEH2_END;

    *pBcb = &iBcb->PFCB;
    *pBuffer = (PVOID)((ULONG_PTR)iBcb->Vacb->BaseAddress + VacbOffset);

    CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> TRUE Bcb=%p, Buffer %p\n",
        FileObject, FileOffset, Length, Flags, *pBcb, *pBuffer);
    return Result;
}

CcpDereferenceBcb()

static VOID CcpDereferenceBcb ( IN PROS_SHARED_CACHE_MAP  SharedCacheMap, IN PINTERNAL_BCB  Bcb  )

static

Definition at line 72 of file pin.c.

{
    ULONG RefCount;
    KIRQL OldIrql;

    KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
    RefCount = --Bcb->RefCount;
    if (RefCount == 0)
    {
        RemoveEntryList(&Bcb->BcbEntry);
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);

        ASSERT(Bcb->PinCount == 0);
        /*
         * Don't mark dirty, if it was dirty,
         * the VACB was already marked as such
         * following the call to CcSetDirtyPinnedData
         */
        CcRosReleaseVacb(SharedCacheMap,
                         Bcb->Vacb,
                         FALSE,
                         FALSE);

        ExDeleteResourceLite(&Bcb->Lock);
        ExFreeToNPagedLookasideList(&iBcbLookasideList, Bcb);
    }
    else
    {
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
    }
}

Referenced by CcMapData(), CcpGetAppropriateBcb(), CcpPinData(), and CcUnpinDataForThread().

CcpFindBcb()

static PINTERNAL_BCB NTAPI CcpFindBcb ( IN PROS_SHARED_CACHE_MAP  SharedCacheMap, IN PLARGE_INTEGER  FileOffset, IN ULONG  Length, IN BOOLEAN  Pinned  )

static

Definition at line 39 of file pin.c.

{
    PINTERNAL_BCB Bcb;
    BOOLEAN Found = FALSE;
    PLIST_ENTRY NextEntry;

    for (NextEntry = SharedCacheMap->BcbList.Flink;
         NextEntry != &SharedCacheMap->BcbList;
         NextEntry = NextEntry->Flink)
    {
        Bcb = CONTAINING_RECORD(NextEntry, INTERNAL_BCB, BcbEntry);

        if (Bcb->PFCB.MappedFileOffset.QuadPart <= FileOffset->QuadPart &&
            (Bcb->PFCB.MappedFileOffset.QuadPart + Bcb->PFCB.MappedLength) >=
            (FileOffset->QuadPart + Length))
        {
            if ((Pinned && Bcb->PinCount > 0) || (!Pinned && Bcb->PinCount == 0))
            {
                Found = TRUE;
                break;
            }
        }
    }

    return (Found ? Bcb : NULL);
}

Referenced by CcMapData(), CcpGetAppropriateBcb(), and CcpPinData().

CcpGetAppropriateBcb()

static PVOID CcpGetAppropriateBcb ( IN PROS_SHARED_CACHE_MAP  SharedCacheMap, IN PROS_VACB  Vacb, IN PLARGE_INTEGER  FileOffset, IN ULONG  Length, IN ULONG  PinFlags, IN BOOLEAN  ToPin  )

static

Definition at line 108 of file pin.c.

{
    KIRQL OldIrql;
    BOOLEAN Result;
    PINTERNAL_BCB iBcb, DupBcb;

    iBcb = ExAllocateFromNPagedLookasideList(&iBcbLookasideList);
    if (iBcb == NULL)
    {
        CcRosReleaseVacb(SharedCacheMap, Vacb, FALSE, FALSE);
        return NULL;
    }

    RtlZeroMemory(iBcb, sizeof(*iBcb));
    iBcb->PFCB.NodeTypeCode = 0x2FD; /* As per KMTests */
    iBcb->PFCB.NodeByteSize = 0;
    iBcb->PFCB.MappedLength = Length;
    iBcb->PFCB.MappedFileOffset = *FileOffset;
    iBcb->Vacb = Vacb;
    iBcb->PinCount = 0;
    iBcb->RefCount = 1;
    ExInitializeResourceLite(&iBcb->Lock);

    KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);

    /* Check if we raced with another BCB creation */
    DupBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, ToPin);
    /* Yes, and we've lost */
    if (DupBcb != NULL)
    {
        /* We will return that BCB */
        ++DupBcb->RefCount;
        Result = TRUE;
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);

        if (ToPin)
        {
            if (BooleanFlagOn(PinFlags, PIN_EXCLUSIVE))
            {
                Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(PinFlags, PIN_WAIT));
            }
            else
            {
                Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(PinFlags, PIN_WAIT));
            }

            if (Result)
            {
                DupBcb->PinCount++;
            }
            else
            {
                CcpDereferenceBcb(SharedCacheMap, DupBcb);
                DupBcb = NULL;
            }
        }

        if (DupBcb != NULL)
        {
            /* Delete the loser */
            CcRosReleaseVacb(SharedCacheMap, Vacb, FALSE, FALSE);
            ExDeleteResourceLite(&iBcb->Lock);
            ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
        }

        /* Return the winner - no need to update buffer address, it's
         * relative to the VACB, which is unchanged.
         */
        iBcb = DupBcb;
    }
    /* Nope, insert ourselves */
    else
    {
        if (ToPin)
        {
            iBcb->PinCount++;

            if (BooleanFlagOn(PinFlags, PIN_EXCLUSIVE))
            {
                Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(PinFlags, PIN_WAIT));
            }
            else
            {
                Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(PinFlags, PIN_WAIT));
            }

            ASSERT(Result);
        }

        InsertTailList(&SharedCacheMap->BcbList, &iBcb->BcbEntry);
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
    }

    return iBcb;
}

Referenced by CcMapData(), and CcpPinData().

CcPinMappedData()

BOOLEAN NTAPI CcPinMappedData	(	IN PFILE_OBJECT	FileObject,
		IN PLARGE_INTEGER	FileOffset,
		IN ULONG	Length,
		IN ULONG	Flags,
		OUT PVOID *	Bcb
	)

Definition at line 427 of file pin.c.

{
    BOOLEAN Result;
    PVOID Buffer;
    PINTERNAL_BCB iBcb;
    PROS_SHARED_CACHE_MAP SharedCacheMap;

    CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
        FileObject, FileOffset, Length, Flags);

    ASSERT(FileObject);
    ASSERT(FileObject->SectionObjectPointer);
    ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);

    SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
    ASSERT(SharedCacheMap);
    if (!SharedCacheMap->PinAccess)
    {
        DPRINT1("FIXME: Pinning a file with no pin access!\n");
        return FALSE;
    }

    iBcb = *Bcb ? CONTAINING_RECORD(*Bcb, INTERNAL_BCB, PFCB) : NULL;

    ++CcPinMappedDataCount;

    Result = CcpPinData(SharedCacheMap, FileOffset, Length, Flags, Bcb, &Buffer);
    if (Result)
    {
        CcUnpinData(&iBcb->PFCB);
    }

    return Result;
}

CcPinRead()

BOOLEAN NTAPI CcPinRead	(	IN PFILE_OBJECT	FileObject,
		IN PLARGE_INTEGER	FileOffset,
		IN ULONG	Length,
		IN ULONG	Flags,
		OUT PVOID *	Bcb,
		OUT PVOID *	Buffer
	)

Definition at line 472 of file pin.c.

{
    PROS_SHARED_CACHE_MAP SharedCacheMap;

    CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
        FileObject, FileOffset, Length, Flags);

    ASSERT(FileObject);
    ASSERT(FileObject->SectionObjectPointer);
    ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);

    SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
    ASSERT(SharedCacheMap);
    if (!SharedCacheMap->PinAccess)
    {
        DPRINT1("FIXME: Pinning a file with no pin access!\n");
        return FALSE;
    }

    if (Flags & PIN_WAIT)
    {
        ++CcPinReadWait;
    }
    else
    {
        ++CcPinReadNoWait;
    }

    return CcpPinData(SharedCacheMap, FileOffset, Length, Flags, Bcb, Buffer);
}

Referenced by CcPreparePinWrite().

CcpPinData()

static BOOLEAN CcpPinData ( IN PROS_SHARED_CACHE_MAP  SharedCacheMap, IN PLARGE_INTEGER  FileOffset, IN ULONG  Length, IN ULONG  Flags, OUT PVOID *  Bcb, OUT PVOID *  Buffer  )

static

Definition at line 212 of file pin.c.

{
    PINTERNAL_BCB NewBcb;
    KIRQL OldIrql;
    ULONG VacbOffset;
    NTSTATUS Status;
    BOOLEAN Result;

    VacbOffset = (ULONG)(FileOffset->QuadPart % VACB_MAPPING_GRANULARITY);

    if ((VacbOffset + Length) > VACB_MAPPING_GRANULARITY)
    {
        /* Complain loudly, we shoud pin the whole range */
        DPRINT1("TRUNCATING DATA PIN FROM %lu to %lu!\n", Length, VACB_MAPPING_GRANULARITY - VacbOffset);
        Length = VACB_MAPPING_GRANULARITY - VacbOffset;
    }

    KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
    NewBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, TRUE);

    if (NewBcb != NULL)
    {
        BOOLEAN Result;

        ++NewBcb->RefCount;
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);

        if (BooleanFlagOn(Flags, PIN_EXCLUSIVE))
            Result = ExAcquireResourceExclusiveLite(&NewBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
        else
            Result = ExAcquireSharedStarveExclusive(&NewBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));

        if (!Result)
        {
            CcpDereferenceBcb(SharedCacheMap, NewBcb);
            return FALSE;
        }

        NewBcb->PinCount++;
    }
    else
    {
        LONGLONG ROffset;
        PROS_VACB Vacb;

        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);

        if (BooleanFlagOn(Flags, PIN_IF_BCB))
        {
            return FALSE;
        }

        /* Properly round offset and call internal helper for getting a VACB */
        ROffset = ROUND_DOWN(FileOffset->QuadPart, VACB_MAPPING_GRANULARITY);
        Status = CcRosGetVacb(SharedCacheMap, ROffset, &Vacb);
        if (!NT_SUCCESS(Status))
        {
            CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
                SharedCacheMap->FileObject, FileOffset, Length, Flags);
            ExRaiseStatus(Status);
            return FALSE;
        }

        NewBcb = CcpGetAppropriateBcb(SharedCacheMap, Vacb, FileOffset, Length, Flags, TRUE);
        if (NewBcb == NULL)
        {
            CcRosReleaseVacb(SharedCacheMap, Vacb, FALSE, FALSE);
            return FALSE;
        }
    }

    Result = FALSE;
    _SEH2_TRY
    {
        /* Ensure the pages are resident */
        Result = CcRosEnsureVacbResident(NewBcb->Vacb,
                BooleanFlagOn(Flags, PIN_WAIT),
                BooleanFlagOn(Flags, PIN_NO_READ),
                VacbOffset, Length);
    }
    _SEH2_FINALLY
    {
        if (!Result)
        {
            CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
                            SharedCacheMap->FileObject, FileOffset, Length, Flags);
            CcUnpinData(&NewBcb->PFCB);
            return FALSE;
        }
    }
    _SEH2_END;

    *Bcb = &NewBcb->PFCB;
    *Buffer = (PVOID)((ULONG_PTR)NewBcb->Vacb->BaseAddress + VacbOffset);

    return TRUE;
}

Referenced by CcPinMappedData(), and CcPinRead().

CcPreparePinWrite()

BOOLEAN NTAPI CcPreparePinWrite	(	IN PFILE_OBJECT	FileObject,
		IN PLARGE_INTEGER	FileOffset,
		IN ULONG	Length,
		IN BOOLEAN	Zero,
		IN ULONG	Flags,
		OUT PVOID *	Bcb,
		OUT PVOID *	Buffer
	)

Definition at line 514 of file pin.c.

{
    CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Zero=%d Flags=0x%lx\n",
        FileObject, FileOffset, Length, Zero, Flags);

    /*
     * FIXME: This is function is similar to CcPinRead, but doesn't
     * read the data if they're not present. Instead it should just
     * prepare the VACBs and zero them out if Zero != FALSE.
     *
     * For now calling CcPinRead is better than returning error or
     * just having UNIMPLEMENTED here.
     */
    return CcPinRead(FileObject, FileOffset, Length, Flags, Bcb, Buffer);
}

CcRepinBcb()

VOID NTAPI CcRepinBcb

(

IN PVOID

Bcb

)

Definition at line 600 of file pin.c.

{
    PINTERNAL_BCB iBcb = CONTAINING_RECORD(Bcb, INTERNAL_BCB, PFCB);

    CCTRACE(CC_API_DEBUG, "Bcb=%p\n", Bcb);

    iBcb->RefCount++;
}

CcSetDirtyPinnedData()

VOID NTAPI CcSetDirtyPinnedData	(	IN PVOID	Bcb,
		IN PLARGE_INTEGER	Lsn
	)

Definition at line 541 of file pin.c.

{
    PINTERNAL_BCB iBcb = CONTAINING_RECORD(Bcb, INTERNAL_BCB, PFCB);

    CCTRACE(CC_API_DEBUG, "Bcb=%p Lsn=%p\n", Bcb, Lsn);

    /* Tell Mm */
    MmMakePagesDirty(NULL,
                     Add2Ptr(iBcb->Vacb->BaseAddress, iBcb->PFCB.MappedFileOffset.QuadPart - iBcb->Vacb->FileOffset.QuadPart),
                     iBcb->PFCB.MappedLength);

    if (!iBcb->Vacb->Dirty)
    {
        CcRosMarkDirtyVacb(iBcb->Vacb);
    }
}

CcUnpinData()

VOID NTAPI CcUnpinData

(

IN PVOID

Bcb

)

Definition at line 565 of file pin.c.

{
    CCTRACE(CC_API_DEBUG, "Bcb=%p\n", Bcb);

    CcUnpinDataForThread(Bcb, (ERESOURCE_THREAD)PsGetCurrentThread());
}

Referenced by CcPinMappedData(), and CcpPinData().

CcUnpinDataForThread()

VOID NTAPI CcUnpinDataForThread	(	IN PVOID	Bcb,
		IN ERESOURCE_THREAD	ResourceThreadId
	)

Definition at line 578 of file pin.c.

{
    PINTERNAL_BCB iBcb = CONTAINING_RECORD(Bcb, INTERNAL_BCB, PFCB);

    CCTRACE(CC_API_DEBUG, "Bcb=%p ResourceThreadId=%lu\n", Bcb, ResourceThreadId);

    if (iBcb->PinCount != 0)
    {
        ExReleaseResourceForThreadLite(&iBcb->Lock, ResourceThreadId);
        iBcb->PinCount--;
    }

    CcpDereferenceBcb(iBcb->Vacb->SharedCacheMap, iBcb);
}

Referenced by CcUnpinData().

CcUnpinRepinnedBcb()

VOID NTAPI CcUnpinRepinnedBcb	(	IN PVOID	Bcb,
		IN BOOLEAN	WriteThrough,
		IN PIO_STATUS_BLOCK	IoStatus
	)

Definition at line 615 of file pin.c.

{
    PINTERNAL_BCB iBcb = CONTAINING_RECORD(Bcb, INTERNAL_BCB, PFCB);
    KIRQL OldIrql;
    PROS_SHARED_CACHE_MAP SharedCacheMap;

    CCTRACE(CC_API_DEBUG, "Bcb=%p WriteThrough=%d\n", Bcb, WriteThrough);

    SharedCacheMap = iBcb->Vacb->SharedCacheMap;
    IoStatus->Status = STATUS_SUCCESS;

    if (WriteThrough)
    {
        CcFlushCache(iBcb->Vacb->SharedCacheMap->FileObject->SectionObjectPointer,
                     &iBcb->PFCB.MappedFileOffset,
                     iBcb->PFCB.MappedLength,
                     IoStatus);
    }
    else
    {
        IoStatus->Status = STATUS_SUCCESS;
        IoStatus->Information = 0;
    }

    KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
    if (--iBcb->RefCount == 0)
    {
        RemoveEntryList(&iBcb->BcbEntry);
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);

        if (iBcb->PinCount != 0)
        {
            ExReleaseResourceLite(&iBcb->Lock);
            iBcb->PinCount--;
            ASSERT(iBcb->PinCount == 0);
        }

        /*
         * Don't mark dirty, if it was dirty,
         * the VACB was already marked as such
         * following the call to CcSetDirtyPinnedData
         */
        CcRosReleaseVacb(iBcb->Vacb->SharedCacheMap,
                         iBcb->Vacb,
                         FALSE,
                         FALSE);

        ExDeleteResourceLite(&iBcb->Lock);
        ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
    }
    else
    {
        KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
    }
}

Variable Documentation

CcMapDataNoWait

ULONG CcMapDataNoWait = 0

Definition at line 29 of file pin.c.

Referenced by CcMapData(), and QSI_DEF().

CcMapDataWait

ULONG CcMapDataWait = 0

Definition at line 28 of file pin.c.

Referenced by CcMapData(), and QSI_DEF().

CcPinMappedDataCount

ULONG CcPinMappedDataCount = 0

Definition at line 32 of file pin.c.

Referenced by CcPinMappedData(), and QSI_DEF().

CcPinReadNoWait

ULONG CcPinReadNoWait = 0

Definition at line 31 of file pin.c.

Referenced by CcPinRead(), and QSI_DEF().

CcPinReadWait

ULONG CcPinReadWait = 0

Definition at line 30 of file pin.c.

Referenced by CcPinRead(), and QSI_DEF().

iBcbLookasideList

NPAGED_LOOKASIDE_LIST iBcbLookasideList

Definition at line 44 of file view.c.

Referenced by CcInitView(), CcpDereferenceBcb(), CcpGetAppropriateBcb(), and CcUnpinRepinnedBcb().