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[NTOSKRNL] Drop the alloc map from page file

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It was making no sense, and implemented in a broken way
that couldn't have worked if code path was used.
This commit is contained in:
Pierre Schweitzer 2018-08-16 12:16:39 +02:00
parent 5bd938bd24
commit 891a6eeeb9
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GPG key ID: 7545556C3D585B0B
1 changed files with 1 additions and 17 deletions
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18
ntoskrnl/mm/pagefile.c
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@ -271,19 +271,6 @@ MmInitPagingFile(VOID)
MmNumberOfPagingFiles = 0; MmNumberOfPagingFiles = 0;
} }
static ULONG
MiAllocPageFromPagingFile(PMMPAGING_FILE PagingFile)
{
KIRQL oldIrql;
ULONG off;
KeAcquireSpinLock(&PagingFile->AllocMapLock, &oldIrql);
off = RtlFindClearBitsAndSet(PagingFile->AllocMap, 1, 0);
KeReleaseSpinLock(&PagingFile->AllocMapLock, oldIrql);
return off;
}
VOID VOID
NTAPI NTAPI
MmFreeSwapPage(SWAPENTRY Entry) MmFreeSwapPage(SWAPENTRY Entry)
@ -303,7 +290,6 @@ MmFreeSwapPage(SWAPENTRY Entry)
{ {
KeBugCheck(MEMORY_MANAGEMENT); KeBugCheck(MEMORY_MANAGEMENT);
} }
KeAcquireSpinLockAtDpcLevel(&PagingFile->AllocMapLock);
RtlClearBit(PagingFile->AllocMap, off >> 5); RtlClearBit(PagingFile->AllocMap, off >> 5);
@ -313,7 +299,6 @@ MmFreeSwapPage(SWAPENTRY Entry)
MiFreeSwapPages++; MiFreeSwapPages++;
MiUsedSwapPages--; MiUsedSwapPages--;
KeReleaseSpinLockFromDpcLevel(&PagingFile->AllocMapLock);
KeReleaseSpinLock(&PagingFileListLock, oldIrql); KeReleaseSpinLock(&PagingFileListLock, oldIrql);
} }
@ -339,7 +324,7 @@ MmAllocSwapPage(VOID)
if (MmPagingFile[i] != NULL && if (MmPagingFile[i] != NULL &&
MmPagingFile[i]->FreePages >= 1) MmPagingFile[i]->FreePages >= 1)
{ {
off = MiAllocPageFromPagingFile(MmPagingFile[i]); off = RtlFindClearBitsAndSet(MmPagingFile[i]->AllocMap, 1, 0);
if (off == 0xFFFFFFFF) if (off == 0xFFFFFFFF)
{ {
KeBugCheck(MEMORY_MANAGEMENT); KeBugCheck(MEMORY_MANAGEMENT);
@ -732,7 +717,6 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
PagingFile->CurrentSize.QuadPart = SafeInitialSize.QuadPart; PagingFile->CurrentSize.QuadPart = SafeInitialSize.QuadPart;
PagingFile->FreePages = (ULONG)(SafeInitialSize.QuadPart / PAGE_SIZE); PagingFile->FreePages = (ULONG)(SafeInitialSize.QuadPart / PAGE_SIZE);
PagingFile->UsedPages = 0; PagingFile->UsedPages = 0;
KeInitializeSpinLock(&PagingFile->AllocMapLock);
PagingFile->PageFileName = PageFileName; PagingFile->PageFileName = PageFileName;
AllocMapSize = sizeof(RTL_BITMAP) + (((PagingFile->FreePages + 31) / 32) * sizeof(ULONG)); AllocMapSize = sizeof(RTL_BITMAP) + (((PagingFile->FreePages + 31) / 32) * sizeof(ULONG));