NTSTATUS
NTAPI
_MiWriteBackPage(PFILE_OBJECT FileObject,
PLARGE_INTEGER FileOffset,
ULONG Length,
PFN_NUMBER Page,
const char *File,
int Line)
{
NTSTATUS Status;
PVOID Hyperspace;
IO_STATUS_BLOCK Iosb;
KIRQL OldIrql;
PVOID PageBuffer = ExAllocatePool(NonPagedPool, PAGE_SIZE);
if (!PageBuffer) return STATUS_NO_MEMORY;
Hyperspace = MiMapPageInHyperSpace(PsGetCurrentProcess(), Page, &OldIrql);
if (!Hyperspace)
{
ExFreePool(PageBuffer);
return STATUS_NO_MEMORY;
}
RtlCopyMemory(PageBuffer, Hyperspace, PAGE_SIZE);
MiUnmapPageInHyperSpace(PsGetCurrentProcess(), Hyperspace, OldIrql);
DPRINT("MiWriteBackPage(%wZ,%08x%08x,%s:%d)\n",
&FileObject->FileName,
FileOffset->u.HighPart,
FileOffset->u.LowPart,
File,
Line);
Status = MiSimpleWrite(FileObject,
FileOffset,
PageBuffer,
Length,
&Iosb);
ExFreePool(PageBuffer);
if (!NT_SUCCESS(Status))
{
DPRINT1("MiSimpleWrite failed (%x)\n", Status);
}
return Status;
}
NTSTATUS
NTAPI
_MiWriteBackPage
(PFILE_OBJECT FileObject,
PLARGE_INTEGER FileOffset,
ULONG Length,
PFN_NUMBER Page,
const char *File,
int Line)
{
NTSTATUS Status;
PVOID Hyperspace;
IO_STATUS_BLOCK Iosb;
KIRQL OldIrql;
PVOID PageBuffer = ExAllocatePool(NonPagedPool, PAGE_SIZE);
if (!PageBuffer) return STATUS_NO_MEMORY;
KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
Hyperspace = MmCreateHyperspaceMapping(Page);
RtlCopyMemory(PageBuffer, Hyperspace, PAGE_SIZE);
MmDeleteHyperspaceMapping(Hyperspace);
KeLowerIrql(OldIrql);
DPRINT1("MiWriteBackPage(%wZ,%08x%08x,%s:%d)\n", &FileObject->FileName, FileOffset->u.HighPart, FileOffset->u.LowPart, File, Line);
Status = MiSimpleWrite
(FileObject,
FileOffset,
PageBuffer,
Length,
&Iosb);
ExFreePool(PageBuffer);
if (!NT_SUCCESS(Status))
{
DPRINT1("MiSimpleWrite failed (%x)\n", Status);
}
return Status;
}
/*
This could be implemented much more intelligently by mapping instances
of a CoW zero page into the affected regions. We just RtlZeroMemory
for now.
*/
BOOLEAN
NTAPI
CcZeroData(IN PFILE_OBJECT FileObject,
IN PLARGE_INTEGER StartOffset,
IN PLARGE_INTEGER EndOffset,
IN BOOLEAN Wait)
{
PNOCC_BCB Bcb = NULL;
PLIST_ENTRY ListEntry = NULL;
LARGE_INTEGER LowerBound = *StartOffset;
LARGE_INTEGER UpperBound = *EndOffset;
LARGE_INTEGER Target, End;
PVOID PinnedBcb, PinnedBuffer;
PNOCC_CACHE_MAP Map = FileObject->SectionObjectPointer->SharedCacheMap;
DPRINT("S %08x%08x E %08x%08x\n",
StartOffset->u.HighPart,
StartOffset->u.LowPart,
EndOffset->u.HighPart,
EndOffset->u.LowPart);
if (!Map)
{
NTSTATUS Status;
IO_STATUS_BLOCK IOSB;
PCHAR ZeroBuf = ExAllocatePool(PagedPool, PAGE_SIZE);
ULONG ToWrite;
if (!ZeroBuf) RtlRaiseStatus(STATUS_INSUFFICIENT_RESOURCES);
DPRINT1("RtlZeroMemory(%x,%x)\n", ZeroBuf, PAGE_SIZE);
RtlZeroMemory(ZeroBuf, PAGE_SIZE);
Target.QuadPart = PAGE_ROUND_DOWN(LowerBound.QuadPart);
End.QuadPart = PAGE_ROUND_UP(UpperBound.QuadPart);
// Handle leading page
if (LowerBound.QuadPart != Target.QuadPart)
{
ToWrite = MIN(UpperBound.QuadPart - LowerBound.QuadPart,
(PAGE_SIZE - LowerBound.QuadPart) & (PAGE_SIZE - 1));
DPRINT("Zero last half %08x%08x %x\n",
Target.u.HighPart,
Target.u.LowPart,
ToWrite);
Status = MiSimpleRead(FileObject,
&Target,
ZeroBuf,
PAGE_SIZE,
TRUE,
&IOSB);
if (!NT_SUCCESS(Status))
{
ExFreePool(ZeroBuf);
RtlRaiseStatus(Status);
}
DPRINT1("RtlZeroMemory(%x,%x)\n",
ZeroBuf + LowerBound.QuadPart - Target.QuadPart,
ToWrite);
RtlZeroMemory(ZeroBuf + LowerBound.QuadPart - Target.QuadPart,
ToWrite);
Status = MiSimpleWrite(FileObject,
&Target,
ZeroBuf,
MIN(PAGE_SIZE,
UpperBound.QuadPart-Target.QuadPart),
&IOSB);
if (!NT_SUCCESS(Status))
{
ExFreePool(ZeroBuf);
RtlRaiseStatus(Status);
}
Target.QuadPart += PAGE_SIZE;
}
DPRINT1("RtlZeroMemory(%x,%x)\n", ZeroBuf, PAGE_SIZE);
RtlZeroMemory(ZeroBuf, PAGE_SIZE);
while (UpperBound.QuadPart - Target.QuadPart > PAGE_SIZE)
{
DPRINT("Zero full page %08x%08x\n",
Target.u.HighPart,
Target.u.LowPart);
Status = MiSimpleWrite(FileObject,
&Target,
ZeroBuf,
PAGE_SIZE,
&IOSB);
if (!NT_SUCCESS(Status))
{
ExFreePool(ZeroBuf);
RtlRaiseStatus(Status);
}
Target.QuadPart += PAGE_SIZE;
}
if (UpperBound.QuadPart > Target.QuadPart)
{
ToWrite = UpperBound.QuadPart - Target.QuadPart;
DPRINT("Zero first half %08x%08x %x\n",
Target.u.HighPart,
Target.u.LowPart,
ToWrite);
Status = MiSimpleRead(FileObject,
&Target,
ZeroBuf,
PAGE_SIZE,
TRUE,
&IOSB);
if (!NT_SUCCESS(Status))
{
ExFreePool(ZeroBuf);
RtlRaiseStatus(Status);
}
DPRINT1("RtlZeroMemory(%x,%x)\n", ZeroBuf, ToWrite);
RtlZeroMemory(ZeroBuf, ToWrite);
Status = MiSimpleWrite(FileObject,
&Target,
ZeroBuf,
MIN(PAGE_SIZE,
UpperBound.QuadPart-Target.QuadPart),
&IOSB);
if (!NT_SUCCESS(Status))
{
ExFreePool(ZeroBuf);
RtlRaiseStatus(Status);
}
Target.QuadPart += PAGE_SIZE;
}
ExFreePool(ZeroBuf);
return TRUE;
}
CcpLock();
ListEntry = Map->AssociatedBcb.Flink;
while (ListEntry != &Map->AssociatedBcb)
{
Bcb = CONTAINING_RECORD(ListEntry, NOCC_BCB, ThisFileList);
CcpReferenceCache(Bcb - CcCacheSections);
if (Bcb->FileOffset.QuadPart + Bcb->Length >= LowerBound.QuadPart &&
Bcb->FileOffset.QuadPart < UpperBound.QuadPart)
{
DPRINT("Bcb #%x (@%08x%08x)\n",
Bcb - CcCacheSections,
Bcb->FileOffset.u.HighPart,
Bcb->FileOffset.u.LowPart);
Target.QuadPart = MAX(Bcb->FileOffset.QuadPart,
LowerBound.QuadPart);
End.QuadPart = MIN(Map->FileSizes.ValidDataLength.QuadPart,
UpperBound.QuadPart);
End.QuadPart = MIN(End.QuadPart,
Bcb->FileOffset.QuadPart + Bcb->Length);
CcpUnlock();
if (!CcPreparePinWrite(FileObject,
&Target,
End.QuadPart - Target.QuadPart,
TRUE,
Wait,
&PinnedBcb,
&PinnedBuffer))
{
return FALSE;
}
ASSERT(PinnedBcb == Bcb);
CcpLock();
ListEntry = ListEntry->Flink;
/* Return from pin state */
CcpUnpinData(PinnedBcb, TRUE);
}
CcpUnpinData(Bcb, TRUE);
}
CcpUnlock();
return TRUE;
}
