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[NTOSKRNL] Start making our MMPAGING_FILE struct look like the real one

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This commit is contained in:
Pierre Schweitzer
2018-08-16 14:04:27 +02:00
parent e392bdf962
commit 19318dcc1d
2 changed files with 26 additions and 22 deletions
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8
ntoskrnl/include/internal/mm.h
View File

@@ -426,14 +426,14 @@ extern MM_MEMORY_CONSUMER MiMemoryConsumers[MC_MAXIMUM];
/* Page file information */
typedef struct _MMPAGING_FILE
{
PFN_NUMBER CurrentSize;
PFN_NUMBER Size;
PFN_NUMBER MaximumSize;
PFN_NUMBER MinimumSize;
PFN_NUMBER FreePages;
PFN_NUMBER UsedPages;
PFN_NUMBER FreeSpace;
PFN_NUMBER CurrentUsage;
PFILE_OBJECT FileObject;
UNICODE_STRING PageFileName;
PRTL_BITMAP AllocMap;
PRTL_BITMAP Bitmap;
HANDLE FileHandle;
}
MMPAGING_FILE, *PMMPAGING_FILE;

40
ntoskrnl/mm/pagefile.c
View File

@@ -290,10 +290,10 @@ MmFreeSwapPage(SWAPENTRY Entry)
KeBugCheck(MEMORY_MANAGEMENT);
}
RtlClearBit(PagingFile->AllocMap, off >> 5);
RtlClearBit(PagingFile->Bitmap, off >> 5);
PagingFile->FreePages++;
PagingFile->UsedPages--;
PagingFile->FreeSpace++;
PagingFile->CurrentUsage--;
MiFreeSwapPages++;
MiUsedSwapPages--;
@@ -320,9 +320,9 @@ MmAllocSwapPage(VOID)
for (i = 0; i < MAX_PAGING_FILES; i++)
{
if (MmPagingFile[i] != NULL &&
MmPagingFile[i]->FreePages >= 1)
MmPagingFile[i]->FreeSpace >= 1)
{
off = RtlFindClearBitsAndSet(MmPagingFile[i]->AllocMap, 1, 0);
off = RtlFindClearBitsAndSet(MmPagingFile[i]->Bitmap, 1, 0);
if (off == 0xFFFFFFFF)
{
KeBugCheck(MEMORY_MANAGEMENT);
@@ -741,17 +741,21 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
PagingFile->FileHandle = FileHandle;
PagingFile->FileObject = FileObject;
PagingFile->MaximumSize = (SafeMaximumSize.QuadPart >> PAGE_SHIFT);
PagingFile->CurrentSize = (SafeMinimumSize.QuadPart >> PAGE_SHIFT);
PagingFile->Size = (SafeMinimumSize.QuadPart >> PAGE_SHIFT);
PagingFile->MinimumSize = (SafeMinimumSize.QuadPart >> PAGE_SHIFT);
PagingFile->FreePages = (ULONG)(SafeMinimumSize.QuadPart / PAGE_SIZE);
PagingFile->UsedPages = 0;
/* First page is never used: it's the header
* TODO: write it
*/
PagingFile->FreeSpace = (ULONG)(SafeMinimumSize.QuadPart / PAGE_SIZE) - 1;
PagingFile->CurrentUsage = 0;
PagingFile->PageFileName = PageFileName;
ASSERT(PagingFile->Size == PagingFile->FreeSpace + PagingFile->CurrentUsage + 1);
AllocMapSize = sizeof(RTL_BITMAP) + (((PagingFile->FreePages + 31) / 32) * sizeof(ULONG));
PagingFile->AllocMap = ExAllocatePoolWithTag(NonPagedPool,
AllocMapSize,
TAG_MM);
if (PagingFile->AllocMap == NULL)
AllocMapSize = sizeof(RTL_BITMAP) + (((PagingFile->MaximumSize + 31) / 32) * sizeof(ULONG));
PagingFile->Bitmap = ExAllocatePoolWithTag(NonPagedPool,
AllocMapSize,
TAG_MM);
if (PagingFile->Bitmap == NULL)
{
ExFreePoolWithTag(PagingFile, TAG_MM);
ObDereferenceObject(FileObject);
@@ -760,10 +764,10 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlInitializeBitMap(PagingFile->AllocMap,
(PULONG)(PagingFile->AllocMap + 1),
(ULONG)(PagingFile->FreePages));
RtlClearAllBits(PagingFile->AllocMap);
RtlInitializeBitMap(PagingFile->Bitmap,
(PULONG)(PagingFile->Bitmap + 1),
(ULONG)(PagingFile->MaximumSize));
RtlClearAllBits(PagingFile->Bitmap);
/* FIXME: should be calling unsafe instead,
* we should already be in a guarded region
@@ -772,7 +776,7 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
ASSERT(MmPagingFile[MmNumberOfPagingFiles] == NULL);
MmPagingFile[MmNumberOfPagingFiles] = PagingFile;
MmNumberOfPagingFiles++;
MiFreeSwapPages = MiFreeSwapPages + PagingFile->FreePages;
MiFreeSwapPages = MiFreeSwapPages + PagingFile->FreeSpace;
KeReleaseGuardedMutex(&MmPageFileCreationLock);
MmSwapSpaceMessage = FALSE;