alcyone/NTOSKRNL/CC/ccpinsupport.cpp

/*
 * PROJECT: Alcyone System Kernel
 * LICENSE: BSD Clause 3
 * PURPOSE: Cache Controller:: Lazy Writer
 * NT KERNEL: 5.11.9360
 * COPYRIGHT:  2023-2029 Dibymartanda Samanta <>
 */ 

#include <ntoskrnl.h>
#define NTDEBUG
#include <debug.h>
#include "ccinternal.hpp"


extern "C"


/*Internal Function*/

BOOLEAN
NTAPI
CcPinFileData(
    _In_ PFILE_OBJECT FileObject,
    _In_ PLARGE_INTEGER FileOffset,
    _In_ ULONG Length,
    _In_ BOOLEAN IsNoWrite,
    _In_ BOOLEAN Flags,
    _In_ ULONG PinFlags,
    _Out_ PCC_BCB* Bcb,
    _Out_ PVOID* Buffer,
    _Out_ LARGE_INTEGER* BeyondLastByte)
{
     // Unimplemented
}

BOOLEAN 
NTAPI
CcMapDataCommon(
    _In_ PFILE_OBJECT FileObject,
    _In_ PLARGE_INTEGER FileOffset,
    _In_ ULONG Length,
    _In_ ULONG Flags,
    _Out_ PVOID *Bcb,
    _Out_ PVOID *Buffer
)
  {
  if (Flags & FILE_PIN_SEQUENTIAL_READ)
        InterlockedIncrement(&CcSequentialReadCount);
    else
        InterlockedIncrement(&CcRandomReadCount);

    KeGetCurrentThread()->WaitIrql = PASSIVE_LEVEL;

    if (Flags & FILE_PIN_SEQUENTIAL_READ)
    {
        *Buffer = CcGetVirtualAddress(SharedMap, *FileOffset, (PVACB *)&Bcb, &ReceivedLength);
        return TRUE;
    }
    else
    {
        LARGE_INTEGER BeyondLastByte;
        if (CcPinFileData(FileObject, FileOffset, Length, TRUE, 0, Flags, Bcb, Buffer, &BeyondLastByte))
        {
            return TRUE;
        }
        else
        {
            InterlockedIncrement(&CCFailedPinReadCount);
            return FALSE;
        }
    }

   }
}

VOID
NTAPI
CcUnpinFileDataEx(
    _In_ PCC_BCB Bcb,
    _In_ BOOLEAN WriteStatus,
    _In_ ULONG Type)
{
    // Unimplementd
}

BOOLEAN
VECTORCALL
CcPinFileData(
    IN PFILE_OBJECT FileObject,
    IN PLARGE_INTEGER FileOffset,
    IN ULONG Length,
    IN BOOLEAN IsReadOnly,
    IN BOOLEAN IsWriteOnly,
    IN ULONG Flags,
    OUT PCC_BCB *Bcb,
    OUT PVOID *BaseAddress,
    OUT PLARGE_INTEGER BeyondLastByte)
{
    // Unimplemented
}


BOOLEAN
NTAPI
CcMapData(
    IN PFILE_OBJECT FileObject,
    IN PLARGE_INTEGER FileOffset,
    IN ULONG Length,
    IN ULONG Flags,
    OUT PVOID *Bcb,
    OUT PVOID *Buffer)
{
    //Unimplemented
}

BOOLEAN
FASTCALL
CcMapDataCommon(
    IN PFILE_OBJECT FileObject,
    IN PLARGE_INTEGER FileOffset,
    IN ULONG Length,
    IN ULONG Flags,
    OUT PVOID *Bcb,
    OUT PVOID *Buffer)
{
    //Unimplemented
}

BOOLEAN
NTAPI
CcPinMappedData(
    IN PFILE_OBJECT FileObject,
    IN PLARGE_INTEGER FileOffset,
    IN ULONG Length,
    IN ULONG Flags,
    IN OUT PCC_BCB Bcb)
{
    //Unimplemented
}

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

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)
{
    //Unimplemented
}

VOID
NTAPI
CcSetBcbOwnerPointer(
    IN PMBCB Bcb,
    IN PVOID OwnerPointer)
{
    //Unimimplemented
}


VOID
NTAPI
CcUnpinData(
    _In_ PVOID BcbPtr)
{
	PCC_BCB Bcb = reinterpret_cast<PCC_BCB>(BcbPtr);
    BOOLEAN WRITE_FLAG = NULL;
		
if (reinterpret_cast<ULONG_PTR>(Bcb) & 1)
{
    WRITE_FLAG = TRUE;
    Bcb = reinterpret_cast<PCC_BCB>(reinterpret_cast<ULONG_PTR>(Bcb) & ~(1));

    CcUnpinFileDataEx(Bcb, WRITE_FLAG, UNPIN_BCB);

    return;
}

 if (Bcb->NodeTypeCode != 762)
{
        WRITE_FLAG = FALSE;
        CcUnpinFileDataEx(Bcb, WRITE_FLAG, UNPIN_BCB);
        return;
}
 for (auto it = ListEntryIterator::begin(&Bcb->BcbLinks); it != ListEntryIterator::end(&Bcb->BcbLinks); ++it)
{
        auto* BCB_CURRENT = CONTAINING_RECORD(it->Blink, CC_BCB, BcbLinks);
        
		CcUnpinData(BCB_CURRENT);
		
}
ExFreePoolWithTag(Bcb);
}

VOID
NTAPI
CcUnpinDataForThread(IN PVOID BcbPtr,
                     IN ERESOURCE_THREAD ResourceThreadId)
{
    PCC_BCB Bcb = BcbPtr;
    BOOLEAN WRITE_FLAG = NULL;

if (reinterpret_cast<ULONG_PTR>(Bcb) & 1)
{
    WRITE_FLAG = TRUE;
    Bcb = reinterpret_cast<PCC_BCB>(reinterpret_cast<ULONG_PTR>(Bcb) & ~(1));

    CcUnpinFileDataEx(Bcb, WRITE_FLAG, );

    return;
}

if (Bcb->NodeTypeCode != 762)
{
        WRITE_FLAG = FALSE;
		ExReleaseResourceForThreadLite(&Bcb->Resource, ResourceThreadId);
        CcUnpinFileDataEx(Bcb, WRITE_FLAG, UNPIN_BCB);
        return;
}
 for (auto it = ListEntryIterator::begin(&Bcb->BcbLinks); it != ListEntryIterator::end(&Bcb->BcbLinks); ++it)
{
        auto* BCB_CURRENT = CONTAINING_RECORD(it->Blink, CC_BCB, BcbLinks);
        
		CcUnpinData(BCB_CURRENT);
		
}
ExFreePoolWithTag(Bcb);
    
}