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[NTOSKRNL] Implement CcPostDeferredWrites() that executes deferred writes.

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Make use of it in the lazy writer
This commit is contained in:
Pierre Schweitzer 2018-02-07 20:27:55 +01:00
parent f4e67aa837
commit 92e64a6c9b
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GPG key ID: 7545556C3D585B0B
3 changed files with 83 additions and 26 deletions
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29
ntoskrnl/cc/lazywrite.c
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@ -159,33 +159,10 @@ CcLazyWriteScan(VOID)
DPRINT1("Lazy writer done (%d)\n", Count);
}
/* Likely not optimal, but let's handle one deferred write now! */
ListEntry = ExInterlockedRemoveHeadList(&CcDeferredWrites, &CcDeferredWriteSpinLock);
if (ListEntry != NULL)
/* If we have deferred writes, try them now! */
if (!IsListEmpty(&CcDeferredWrites))
{
PDEFERRED_WRITE Context;
/* Extract the context */
Context = CONTAINING_RECORD(ListEntry, DEFERRED_WRITE, DeferredWriteLinks);
ASSERT(Context->NodeTypeCode == NODE_TYPE_DEFERRED_WRITE);
/* Can we write now? */
if (CcCanIWrite(Context->FileObject, Context->BytesToWrite, FALSE, TRUE))
{
/* Yes! Do it, and destroy the associated context */
Context->PostRoutine(Context->Context1, Context->Context2);
ExFreePoolWithTag(Context, 'CcDw');
}
else
{
/* Otherwise, requeue it, but in tail, so that it doesn't block others
* This is clearly to improve, but given the poor algorithm used now
* It's better than nothing!
*/
ExInterlockedInsertTailList(&CcDeferredWrites,
&Context->DeferredWriteLinks,
&CcDeferredWriteSpinLock);
}
CcPostDeferredWrites();
}
while (!IsListEmpty(&ToPost))