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[NTOSKRNL] Revert r4668 (yeah, that was 15y ago)

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It's hardly understandable and doesn't really makes sense.
Furthermore, it breaks compatibility with 3rd party FSD that
don't implement such FSCTL.
Obviously, Windows doesn't do this.
This commit is contained in:
Pierre Schweitzer 2018-08-11 18:37:31 +02:00
parent 28b4b419c2
commit 814a6fc098
No known key found for this signature in database
GPG key ID: 7545556C3D585B0B
1 changed files with 0 additions and 238 deletions
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238
ntoskrnl/mm/pagefile.c
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@ -54,17 +54,9 @@ typedef struct _PAGINGFILE
PULONG AllocMap;
KSPIN_LOCK AllocMapLock;
ULONG AllocMapSize;
PRETRIEVAL_POINTERS_BUFFER RetrievalPointers;
}
PAGINGFILE, *PPAGINGFILE;
typedef struct _RETRIEVEL_DESCRIPTOR_LIST
{
struct _RETRIEVEL_DESCRIPTOR_LIST* Next;
RETRIEVAL_POINTERS_BUFFER RetrievalPointers;
}
RETRIEVEL_DESCRIPTOR_LIST, *PRETRIEVEL_DESCRIPTOR_LIST;
/* GLOBALS *******************************************************************/
#define PAIRS_PER_RUN (1024)
@ -161,63 +153,6 @@ MmShowOutOfSpaceMessagePagingFile(VOID)
}
}
static LARGE_INTEGER
MmGetOffsetPageFile(PRETRIEVAL_POINTERS_BUFFER RetrievalPointers, LARGE_INTEGER Offset)
{
/* Simple binary search */
ULONG first, last, mid;
first = 0;
last = RetrievalPointers->ExtentCount - 1;
while (first <= last)
{
mid = (last - first) / 2 + first;
if (Offset.QuadPart < RetrievalPointers->Extents[mid].NextVcn.QuadPart)
{
if (mid == 0)
{
Offset.QuadPart += RetrievalPointers->Extents[0].Lcn.QuadPart - RetrievalPointers->StartingVcn.QuadPart;
return Offset;
}
else
{
if (Offset.QuadPart >= RetrievalPointers->Extents[mid-1].NextVcn.QuadPart)
{
Offset.QuadPart += RetrievalPointers->Extents[mid].Lcn.QuadPart - RetrievalPointers->Extents[mid-1].NextVcn.QuadPart;
return Offset;
}
last = mid - 1;
}
}
else
{
if (mid == RetrievalPointers->ExtentCount - 1)
{
break;
}
if (Offset.QuadPart < RetrievalPointers->Extents[mid+1].NextVcn.QuadPart)
{
Offset.QuadPart += RetrievalPointers->Extents[mid+1].Lcn.QuadPart - RetrievalPointers->Extents[mid].NextVcn.QuadPart;
return Offset;
}
first = mid + 1;
}
}
KeBugCheck(MEMORY_MANAGEMENT);
#if defined(__GNUC__)
return (LARGE_INTEGER)0LL;
#else
{
const LARGE_INTEGER dummy =
{
{0}
};
return dummy;
}
#endif
}
NTSTATUS
NTAPI
MmWriteToSwapPage(SWAPENTRY SwapEntry, PFN_NUMBER Page)
@ -254,7 +189,6 @@ MmWriteToSwapPage(SWAPENTRY SwapEntry, PFN_NUMBER Page)
Mdl->MdlFlags |= MDL_PAGES_LOCKED;
file_offset.QuadPart = offset * PAGE_SIZE;
file_offset = MmGetOffsetPageFile(PagingFileList[i]->RetrievalPointers, file_offset);
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Status = IoSynchronousPageWrite(PagingFileList[i]->FileObject,
@ -321,7 +255,6 @@ MiReadPageFile(
Mdl->MdlFlags |= MDL_PAGES_LOCKED;
file_offset.QuadPart = PageFileOffset * PAGE_SIZE;
file_offset = MmGetOffsetPageFile(PagingFile->RetrievalPointers, file_offset);
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Status = IoPageRead(PagingFile->FileObject,
@ -461,22 +394,6 @@ MmAllocSwapPage(VOID)
return(0);
}
static PRETRIEVEL_DESCRIPTOR_LIST FASTCALL
MmAllocRetrievelDescriptorList(ULONG Pairs)
{
ULONG Size;
PRETRIEVEL_DESCRIPTOR_LIST RetDescList;
Size = sizeof(RETRIEVEL_DESCRIPTOR_LIST) + Pairs * 2 * sizeof(LARGE_INTEGER);
RetDescList = ExAllocatePool(NonPagedPool, Size);
if (RetDescList)
{
RtlZeroMemory(RetDescList, Size);
}
return RetDescList;
}
NTSTATUS NTAPI
NtCreatePagingFile(IN PUNICODE_STRING FileName,
IN PLARGE_INTEGER InitialSize,
@ -491,16 +408,8 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
PPAGINGFILE PagingFile;
KIRQL oldIrql;
ULONG AllocMapSize;
FILE_FS_SIZE_INFORMATION FsSizeInformation;
PRETRIEVEL_DESCRIPTOR_LIST RetDescList;
PRETRIEVEL_DESCRIPTOR_LIST CurrentRetDescList;
ULONG i;
ULONG BytesPerAllocationUnit;
LARGE_INTEGER Vcn;
ULONG ExtentCount;
LARGE_INTEGER MaxVcn;
ULONG Count;
ULONG Size;
KPROCESSOR_MODE PreviousMode;
UNICODE_STRING CapturedFileName;
LARGE_INTEGER SafeInitialSize, SafeMaximumSize, AllocationSize;
@ -701,20 +610,6 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
/* DACL is no longer needed, free it */
ExFreePoolWithTag(Dacl, 'lcaD');
Status = ZwQueryVolumeInformationFile(FileHandle,
&IoStatus,
&FsSizeInformation,
sizeof(FILE_FS_SIZE_INFORMATION),
FileFsSizeInformation);
if (!NT_SUCCESS(Status))
{
ZwClose(FileHandle);
return Status;
}
BytesPerAllocationUnit = FsSizeInformation.SectorsPerAllocationUnit *
FsSizeInformation.BytesPerSector;
/* Set its end of file to initial size */
Status = ZwSetInformationFile(FileHandle,
&IoStatus,
@ -749,82 +644,9 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
return STATUS_FLOPPY_VOLUME;
}
CurrentRetDescList = RetDescList = MmAllocRetrievelDescriptorList(PAIRS_PER_RUN);
if (CurrentRetDescList == NULL)
{
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
return(STATUS_NO_MEMORY);
}
#if defined(__GNUC__)
Vcn.QuadPart = 0LL;
#else
Vcn.QuadPart = 0;
#endif
ExtentCount = 0;
MaxVcn.QuadPart = (SafeInitialSize.QuadPart + BytesPerAllocationUnit - 1) / BytesPerAllocationUnit;
while(1)
{
Status = ZwFsControlFile(FileHandle,
0,
NULL,
NULL,
&IoStatus,
FSCTL_GET_RETRIEVAL_POINTERS,
&Vcn,
sizeof(LARGE_INTEGER),
&CurrentRetDescList->RetrievalPointers,
sizeof(RETRIEVAL_POINTERS_BUFFER) + PAIRS_PER_RUN * 2 * sizeof(LARGE_INTEGER));
if (!NT_SUCCESS(Status))
{
while (RetDescList)
{
CurrentRetDescList = RetDescList;
RetDescList = RetDescList->Next;
ExFreePool(CurrentRetDescList);
}
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
return(Status);
}
ExtentCount += CurrentRetDescList->RetrievalPointers.ExtentCount;
if (CurrentRetDescList->RetrievalPointers.Extents[CurrentRetDescList->RetrievalPointers.ExtentCount-1].NextVcn.QuadPart < MaxVcn.QuadPart)
{
CurrentRetDescList->Next = MmAllocRetrievelDescriptorList(PAIRS_PER_RUN);
if (CurrentRetDescList->Next == NULL)
{
while (RetDescList)
{
CurrentRetDescList = RetDescList;
RetDescList = RetDescList->Next;
ExFreePool(CurrentRetDescList);
}
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
return(STATUS_NO_MEMORY);
}
Vcn = CurrentRetDescList->RetrievalPointers.Extents[CurrentRetDescList->RetrievalPointers.ExtentCount-1].NextVcn;
CurrentRetDescList = CurrentRetDescList->Next;
}
else
{
break;
}
}
PagingFile = ExAllocatePool(NonPagedPool, sizeof(*PagingFile));
if (PagingFile == NULL)
{
while (RetDescList)
{
CurrentRetDescList = RetDescList;
RetDescList = RetDescList->Next;
ExFreePool(CurrentRetDescList);
}
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
return(STATUS_NO_MEMORY);
@ -847,29 +669,6 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
if (PagingFile->AllocMap == NULL)
{
while (RetDescList)
{
CurrentRetDescList = RetDescList;
RetDescList = RetDescList->Next;
ExFreePool(CurrentRetDescList);
}
ExFreePool(PagingFile);
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
return(STATUS_NO_MEMORY);
}
DPRINT("ExtentCount: %lu\n", ExtentCount);
Size = sizeof(RETRIEVAL_POINTERS_BUFFER) + ExtentCount * 2 * sizeof(LARGE_INTEGER);
PagingFile->RetrievalPointers = ExAllocatePool(NonPagedPool, Size);
if (PagingFile->RetrievalPointers == NULL)
{
while (RetDescList)
{
CurrentRetDescList = RetDescList;
RetDescList = RetDescList->Next;
ExFreePool(CurrentRetDescList);
}
ExFreePool(PagingFile->AllocMap);
ExFreePool(PagingFile);
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
@ -877,43 +676,6 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
}
RtlZeroMemory(PagingFile->AllocMap, AllocMapSize * sizeof(ULONG));
RtlZeroMemory(PagingFile->RetrievalPointers, Size);
Count = 0;
PagingFile->RetrievalPointers->ExtentCount = ExtentCount;
PagingFile->RetrievalPointers->StartingVcn = RetDescList->RetrievalPointers.StartingVcn;
CurrentRetDescList = RetDescList;
while (CurrentRetDescList)
{
memcpy(&PagingFile->RetrievalPointers->Extents[Count],
CurrentRetDescList->RetrievalPointers.Extents,
CurrentRetDescList->RetrievalPointers.ExtentCount * 2 * sizeof(LARGE_INTEGER));
Count += CurrentRetDescList->RetrievalPointers.ExtentCount;
RetDescList = CurrentRetDescList;
CurrentRetDescList = CurrentRetDescList->Next;
ExFreePool(RetDescList);
}
if (PagingFile->RetrievalPointers->ExtentCount != ExtentCount ||
PagingFile->RetrievalPointers->Extents[ExtentCount - 1].NextVcn.QuadPart != MaxVcn.QuadPart)
{
ExFreePool(PagingFile->RetrievalPointers);
ExFreePool(PagingFile->AllocMap);
ExFreePool(PagingFile);
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
return(STATUS_UNSUCCESSFUL);
}
/*
* Change the entries from lcn's to volume offset's.
*/
PagingFile->RetrievalPointers->StartingVcn.QuadPart *= BytesPerAllocationUnit;
for (i = 0; i < ExtentCount; i++)
{
PagingFile->RetrievalPointers->Extents[i].Lcn.QuadPart *= BytesPerAllocationUnit;
PagingFile->RetrievalPointers->Extents[i].NextVcn.QuadPart *= BytesPerAllocationUnit;
}
KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
for (i = 0; i < MAX_PAGING_FILES; i++)