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[NTOSKRNL:CC] Implemented CcUnpinFileDataEx

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Implemented CcUnpinFileDataEx responsible for unpinning BCB and cleaning if it is dirty 
*Fixed Typo for freeing pool memory of some other function
This commit is contained in:
Dibyamartanda Samanta 2024-07-04 20:33:07 +02:00
parent 7157abd1f9
commit 3adfb0cff6
1 changed files with 107 additions and 7 deletions
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114
NTOSKRNL/CC/ccpinsupport.cpp
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@ -77,10 +77,110 @@ VOID
NTAPI
CcUnpinFileDataEx(
_In_ PCC_BCB Bcb,
_In_ BOOLEAN WriteStatus,
_In_ ULONG Type)
_In_ BOOLEAN& WriteStatus,
_In_ ULONG& UnPinType)
{
// Unimplementd
PSHARED_CACHE_MAP SharedCacheMap = nullptr;
KIRQL OldIrql = {0};
ULONG NumberOfPages = {0};
BOOLEAN ReadOnly = false;
/* If it is not BCB Ptr,it must be VACB Pointer, free it*/
if (Bcb->NodeTypeCode != BCB_NODE_TYPE_CODE)
{
PVACB Vacb = reinterpret_cast<PVACB>(Bcb);
CcFreeVirtualAddress(Vacb);
return;
}
SharedCacheMap = Bcb->SharedCacheMap;
/* Is it only Unpinning if so is their no write performed by Cache Controller */
if (!(SharedCacheMap->Flags & SHARED_CACHE_MAP_MODIFIED_NO_WRITE) || UnPinType == UnPin)
ReadOnly = TRUE;
OldIrql = KeAcquireSpinLockRaiseToDpc(&SharedCacheMap->BcbSpinLock);
/* Just reduce pin count if BCB is not set to be cleaned else perform cleaning of BCB*/
if (UnPinType < CLEAN_BCB_PIN)
{
ASSERT(Bcb->PinCount > 0);
Bcb->PinCount--;
}
else
{
if (UnPinType != CLEAN_BCB_PIN)
KeBugCheckEx(UNEXPECTED_VALUE, UnPinType, (ULONG_PTR)Bcb, 0, 0);
if (Bcb->IsBCBDirty)
{
NumberOfPages = (Bcb->Length / PAGE_SIZE);
Bcb->IsBCBDirty = FALSE;
Bcb->NewestDirtiedPage = 0;
Bcb->NewestLsn.QuadPart = 0;
CcDeductIsBCBDirtyPages(SharedCacheMap, NumberOfPages);
/*Adjust page count */
if (CcPagesYetToWrite <= NumberOfPages)
CcPagesYetToWrite = 0;
else
CcPagesYetToWrite -= NumberOfPages;
if (!SharedCacheMap->IsBCBDirtyPages && SharedCacheMap->OpenCount)
CcInsertIntoCleanSharedCacheMapList(SharedCacheMap);
}
}
if (Bcb->PinCount)
{ /* If not read only BCB, release resources,their no point being pinned at that case */
if (!ReadOnly)
ExReleaseResourceLite(&Bcb->BcbResource);
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
}
/*if BCB is dirty, free the virtual adress*/
else if (Bcb->IsBCBDirty)
{
if (Bcb->BaseAddress)
{
CcFreeVirtualAddress(Bcb->Vacb);
Bcb->BaseAddress = NULL;
Bcb->Vacb = NULL;
}
if (!ReadOnly)
ExReleaseResourceLite(&Bcb->BcbResource);
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
}
else
{
KeAcquireSpinLockAtDpcLevel(&SharedCacheMap->VacbSpinLock);
RemoveEntryList(&Bcb->Link);
if (SharedCacheMap->SectionSize.QuadPart > CACHE_OVERALL_SIZE &&
(SharedCacheMap->Flags & SHARED_CACHE_MAP_MODIFIED_NO_WRITE))
{
CcAdjustVacbLevelLockCount(SharedCacheMap, &Bcb->FileOffset.QuadPart, -1);
}
KeReleaseSpinLockFromDpcLevel(&SharedCacheMap->VacbSpinLock);
if (Bcb->BaseAddress)
CcFreeVirtualAddress(Bcb->Vacb);
if (!ReadOnly)
ExReleaseResourceLite(&Bcb->BcbResource);
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
CcDeallocateBcb(Bcb);
}
}
BOOLEAN
@ -183,7 +283,7 @@ CcUnpinData(
PCC_BCB Bcb = reinterpret_cast<PCC_BCB>(BcbPtr);
BOOLEAN WRITE_FLAG = NULL;
if (reinterpret_cast<ULONG_PTR>(Bcb) & 1)
if (reinterpret_cast<ULONG_PTR>((Bcb & 1))
{
WRITE_FLAG = TRUE;
Bcb = reinterpret_cast<PCC_BCB>(reinterpret_cast<ULONG_PTR>(Bcb) & ~(1));
@ -206,7 +306,7 @@ if (reinterpret_cast<ULONG_PTR>(Bcb) & 1)
CcUnpinData(BCB_CURRENT);
}
ExFreePoolWithTag(Bcb);
ExFreePoolWithTag(Bcb,NULL);
}
VOID
@ -217,7 +317,7 @@ CcUnpinDataForThread(IN PVOID BcbPtr,
PCC_BCB Bcb = BcbPtr;
BOOLEAN WRITE_FLAG = NULL;
if (reinterpret_cast<ULONG_PTR>(Bcb) & 1)
if (reinterpret_cast<ULONG_PTR>((Bcb & 1))
{
WRITE_FLAG = TRUE;
Bcb = reinterpret_cast<PCC_BCB>(reinterpret_cast<ULONG_PTR>(Bcb) & ~(1));
@ -241,7 +341,7 @@ if (Bcb->NodeTypeCode != 762)
CcUnpinData(BCB_CURRENT);
}
ExFreePoolWithTag(Bcb);
ExFreePoolWithTag(Bcb,NULL);
}