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[NTOSKRNL] Stubplement CcPinMappedData() and simplify CcPinRead()
It's based on the code that was in CcPinRead() implementation. This made no sense to have CcPinMappedData() doing nothing while implementing everything in CcPinRead(). Indeed, drivers (starting with MS drivers) can map data first and pin it afterwards with CcPinMappedData(). It was leading to incorrect behavior with our previous noop implementation.
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@ -161,6 +161,7 @@ CcPinMappedData (
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IN ULONG Flags,
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OUT PVOID * Bcb)
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{
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PINTERNAL_BCB iBcb;
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PROS_SHARED_CACHE_MAP SharedCacheMap;
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CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
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@ -174,7 +175,21 @@ CcPinMappedData (
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ASSERT(SharedCacheMap);
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ASSERT(SharedCacheMap->PinAccess);
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/* no-op for current implementation. */
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iBcb = *Bcb;
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ASSERT(iBcb->Pinned == FALSE);
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iBcb->Pinned = TRUE;
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iBcb->Vacb->PinCount++;
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if (Flags & PIN_EXCLUSIVE)
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{
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ExAcquireResourceExclusiveLite(&iBcb->Lock, TRUE);
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}
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else
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{
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ExAcquireResourceSharedLite(&iBcb->Lock, TRUE);
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}
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return TRUE;
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}
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@ -191,8 +206,6 @@ CcPinRead (
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OUT PVOID * Bcb,
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OUT PVOID * Buffer)
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{
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PINTERNAL_BCB iBcb;
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CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
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FileObject, FileOffset, Length, Flags);
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@ -205,32 +218,20 @@ CcPinRead (
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++CcPinReadNoWait;
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}
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if (CcMapData(FileObject, FileOffset, Length, Flags, Bcb, Buffer))
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/* Map first */
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if (!CcMapData(FileObject, FileOffset, Length, Flags, Bcb, Buffer))
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{
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if (CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
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{
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iBcb = *Bcb;
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ASSERT(iBcb->Pinned == FALSE);
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iBcb->Pinned = TRUE;
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iBcb->Vacb->PinCount++;
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if (Flags & PIN_EXCLUSIVE)
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{
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ExAcquireResourceExclusiveLite(&iBcb->Lock, TRUE);
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return FALSE;
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}
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else
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/* Pin then */
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if (!CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
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{
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ExAcquireResourceSharedLite(&iBcb->Lock, TRUE);
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CcUnpinData(*Bcb);
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return FALSE;
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}
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return TRUE;
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}
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else
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CcUnpinData(*Bcb);
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}
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return FALSE;
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}
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/*
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