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[NTOS:CC] Simplify CcFlushCache implementation

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This commit is contained in:
Jérôme Gardou 2021-01-05 10:45:39 +01:00
parent 9b6240ee03
commit 20fe42c9e9
1 changed files with 55 additions and 45 deletions
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100
ntoskrnl/cc/view.c
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@ -899,62 +899,72 @@ CcFlushCache (
OUT PIO_STATUS_BLOCK IoStatus)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
LARGE_INTEGER Offset;
LONGLONG RemainingLength;
PROS_VACB current;
LONGLONG FlushStart, FlushEnd;
NTSTATUS Status;
CCTRACE(CC_API_DEBUG, "SectionObjectPointers=%p FileOffset=0x%I64X Length=%lu\n",
SectionObjectPointers, FileOffset ? FileOffset->QuadPart : 0LL, Length);
if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
if (!SectionObjectPointers || !SectionObjectPointers->SharedCacheMap)
{
SharedCacheMap = SectionObjectPointers->SharedCacheMap;
ASSERT(SharedCacheMap);
if (FileOffset)
{
Offset = *FileOffset;
RemainingLength = Length;
}
else
{
Offset.QuadPart = 0;
RemainingLength = SharedCacheMap->FileSize.QuadPart;
}
Status = STATUS_INVALID_PARAMETER;
goto quit;
}
if (IoStatus)
{
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = 0;
}
while (RemainingLength > 0)
{
current = CcRosLookupVacb(SharedCacheMap, Offset.QuadPart);
if (current != NULL)
{
if (current->Dirty)
{
Status = CcRosFlushVacb(current);
if (!NT_SUCCESS(Status) && IoStatus != NULL)
{
IoStatus->Status = Status;
}
}
CcRosReleaseVacb(SharedCacheMap, current, FALSE, FALSE);
}
Offset.QuadPart += VACB_MAPPING_GRANULARITY;
RemainingLength -= min(RemainingLength, VACB_MAPPING_GRANULARITY);
}
SharedCacheMap = SectionObjectPointers->SharedCacheMap;
ASSERT(SharedCacheMap);
if (FileOffset)
{
FlushStart = FileOffset->QuadPart;
Status = RtlLongLongAdd(FlushStart, Length, &FlushEnd);
if (!NT_SUCCESS(Status))
goto quit;
}
else
{
if (IoStatus)
FlushStart = 0;
FlushEnd = SharedCacheMap->FileSize.QuadPart;
}
Status = STATUS_SUCCESS;
if (IoStatus)
{
IoStatus->Information = 0;
}
while (FlushStart < FlushEnd)
{
PROS_VACB vacb = CcRosLookupVacb(SharedCacheMap, FlushStart);
if (vacb != NULL)
{
IoStatus->Status = STATUS_INVALID_PARAMETER;
if (vacb->Dirty)
{
Status = CcRosFlushVacb(vacb);
if (!NT_SUCCESS(Status))
{
goto quit;
}
}
CcRosReleaseVacb(SharedCacheMap, vacb, FALSE, FALSE);
if (IoStatus)
IoStatus->Information += VACB_MAPPING_GRANULARITY;
}
if (!NT_SUCCESS(RtlLongLongAdd(FlushStart, VACB_MAPPING_GRANULARITY, &FlushStart)))
{
/* We're at the end of file ! */
break;
}
}
quit:
if (IoStatus)
{
IoStatus->Status = Status;
}
}
@ -1188,7 +1198,7 @@ CcRosInitializeFileCache (
FileObject->SectionObjectPointer->SharedCacheMap = SharedCacheMap;
// CcRosTraceCacheMap(SharedCacheMap, TRUE);
//CcRosTraceCacheMap(SharedCacheMap, TRUE);
}
else if (SharedCacheMap->Flags & SHARED_CACHE_MAP_IN_CREATION)
{