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[NTOS:CC] Rewrite the non-cached path of CcZeroData

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This commit is contained in:
Jérôme Gardou 2020-12-02 12:27:32 +01:00
parent 36e18aab35
commit 7f47f03296
1 changed files with 19 additions and 16 deletions
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35
ntoskrnl/cc/copy.c
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@ -759,25 +759,25 @@ CcZeroData (
PMDL Mdl;
ULONG i;
ULONG CurrentLength;
PPFN_NUMBER PfnArray;
Mdl = _alloca(MmSizeOfMdl(NULL, MAX_ZERO_LENGTH));
/* Setup our Mdl */
Mdl = IoAllocateMdl(NULL, min(Length, MAX_ZERO_LENGTH), FALSE, FALSE, NULL);
if (!Mdl)
ExRaiseStatus(STATUS_INSUFFICIENT_RESOURCES);
PfnArray = MmGetMdlPfnArray(Mdl);
for (i = 0; i < BYTES_TO_PAGES(Mdl->ByteCount); i++)
PfnArray[i] = CcZeroPage;
Mdl->MdlFlags |= MDL_PAGES_LOCKED;
/* Perform the write sequencially */
while (Length > 0)
{
if (Length + WriteOffset.QuadPart % PAGE_SIZE > MAX_ZERO_LENGTH)
{
CurrentLength = MAX_ZERO_LENGTH - WriteOffset.QuadPart % PAGE_SIZE;
}
else
{
CurrentLength = Length;
}
MmInitializeMdl(Mdl, (PVOID)(ULONG_PTR)WriteOffset.QuadPart, CurrentLength);
Mdl->MdlFlags |= MDL_PAGES_LOCKED;
for (i = 0; i < ((Mdl->Size - sizeof(MDL)) / sizeof(ULONG)); i++)
{
((PPFN_NUMBER)(Mdl + 1))[i] = CcZeroPage;
}
CurrentLength = min(Length, MAX_ZERO_LENGTH);
Mdl->ByteCount = CurrentLength;
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Status = IoSynchronousPageWrite(FileObject, Mdl, &WriteOffset, &Event, &Iosb);
if (Status == STATUS_PENDING)
@ -791,12 +791,15 @@ CcZeroData (
}
if (!NT_SUCCESS(Status))
{
return FALSE;
IoFreeMdl(Mdl);
ExRaiseStatus(Status);
}
WriteOffset.QuadPart += CurrentLength;
Length -= CurrentLength;
}
IoFreeMdl(Mdl);
return TRUE;
}