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reactos/ntoskrnl/mm/pagefile.c

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/*
* ReactOS kernel
* Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/pagefile.c
* PURPOSE: Paging file functions
* PROGRAMMER: David Welch (welch@mcmail.com)
* UPDATE HISTORY:
* Created 22/05/98
*/
/* INCLUDES *****************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#if defined (ALLOC_PRAGMA)
#pragma alloc_text(INIT, MmInitPagingFile)
#endif
PVOID
NTAPI
MiFindExportedRoutineByName(IN PVOID DllBase,
IN PANSI_STRING ExportName);
/* TYPES *********************************************************************/
typedef struct _PAGINGFILE
{
LIST_ENTRY PagingFileListEntry;
PFILE_OBJECT FileObject;
LARGE_INTEGER MaximumSize;
LARGE_INTEGER CurrentSize;
PFN_NUMBER FreePages;
PFN_NUMBER UsedPages;
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)
#define MAX_PAGING_FILES (16)
/* List of paging files, both used and free */
static PPAGINGFILE PagingFileList[MAX_PAGING_FILES];
/* Lock for examining the list of paging files */
static KSPIN_LOCK PagingFileListLock;
/* Number of paging files */
ULONG MmNumberOfPagingFiles;
/* Number of pages that are available for swapping */
PFN_COUNT MiFreeSwapPages;
/* Number of pages that have been allocated for swapping */
PFN_COUNT MiUsedSwapPages;
BOOLEAN MmZeroPageFile;
/*
* Number of pages that have been reserved for swapping but not yet allocated
*/
static PFN_COUNT MiReservedSwapPages;
/*
* Ratio between reserved and available swap pages, e.g. setting this to five
* forces one swap page to be available for every five swap pages that are
* reserved. Setting this to zero turns off commit checking altogether.
*/
#define MM_PAGEFILE_COMMIT_RATIO (1)
/*
* Number of pages that can be used for potentially swapable memory without
* pagefile space being reserved. The intention is that this allows smss
* to start up and create page files while ordinarily having a commit
* ratio of one.
*/
#define MM_PAGEFILE_COMMIT_GRACE (256)
/*
* Translate between a swap entry and a file and offset pair.
*/
#define FILE_FROM_ENTRY(i) ((i) & 0x0f)
#define OFFSET_FROM_ENTRY(i) ((i) >> 11)
#define ENTRY_FROM_FILE_OFFSET(i, j) ((i) | ((j) << 11) | 0x400)
/* Make sure there can be only 16 paging files */
C_ASSERT(FILE_FROM_ENTRY(0xffffffff) < MAX_PAGING_FILES);
static BOOLEAN MmSwapSpaceMessage = FALSE;
/* FUNCTIONS *****************************************************************/
VOID
NTAPI
MmBuildMdlFromPages(PMDL Mdl, PPFN_NUMBER Pages)
{
memcpy(Mdl + 1, Pages, sizeof(PFN_NUMBER) * (PAGE_ROUND_UP(Mdl->ByteOffset+Mdl->ByteCount)/PAGE_SIZE));
/* FIXME: this flag should be set by the caller perhaps? */
Mdl->MdlFlags |= MDL_IO_PAGE_READ;
}
BOOLEAN
NTAPI
MmIsFileObjectAPagingFile(PFILE_OBJECT FileObject)
{
ULONG i;
/* Loop through all the paging files */
for (i = 0; i < MmNumberOfPagingFiles; i++)
{
/* Check if this is one of them */
if (PagingFileList[i]->FileObject == FileObject) return TRUE;
}
/* Nothing found */
return FALSE;
}
VOID
NTAPI
MmShowOutOfSpaceMessagePagingFile(VOID)
{
if (!MmSwapSpaceMessage)
{
DPRINT1("MM: Out of swap space.\n");
MmSwapSpaceMessage = TRUE;
}
}
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)
{
ULONG i;
ULONG_PTR offset;
LARGE_INTEGER file_offset;
IO_STATUS_BLOCK Iosb;
NTSTATUS Status;
KEVENT Event;
UCHAR MdlBase[sizeof(MDL) + sizeof(ULONG)];
PMDL Mdl = (PMDL)MdlBase;
DPRINT("MmWriteToSwapPage\n");
if (SwapEntry == 0)
{
KeBugCheck(MEMORY_MANAGEMENT);
return(STATUS_UNSUCCESSFUL);
}
i = FILE_FROM_ENTRY(SwapEntry);
offset = OFFSET_FROM_ENTRY(SwapEntry) - 1;
if (PagingFileList[i]->FileObject == NULL ||
PagingFileList[i]->FileObject->DeviceObject == NULL)
{
DPRINT1("Bad paging file 0x%.8X\n", SwapEntry);
KeBugCheck(MEMORY_MANAGEMENT);
}
MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
MmBuildMdlFromPages(Mdl, &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,
Mdl,
&file_offset,
&Event,
&Iosb);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = Iosb.Status;
}
if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
{
MmUnmapLockedPages (Mdl->MappedSystemVa, Mdl);
}
return(Status);
}
NTSTATUS
NTAPI
MmReadFromSwapPage(SWAPENTRY SwapEntry, PFN_NUMBER Page)
{
return MiReadPageFile(Page, FILE_FROM_ENTRY(SwapEntry), OFFSET_FROM_ENTRY(SwapEntry) - 1);
}
NTSTATUS
NTAPI
MiReadPageFile(
_In_ PFN_NUMBER Page,
_In_ ULONG PageFileIndex,
_In_ ULONG_PTR PageFileOffset)
{
LARGE_INTEGER file_offset;
IO_STATUS_BLOCK Iosb;
NTSTATUS Status;
KEVENT Event;
UCHAR MdlBase[sizeof(MDL) + sizeof(ULONG)];
PMDL Mdl = (PMDL)MdlBase;
PPAGINGFILE PagingFile;
DPRINT("MiReadSwapFile\n");
if (PageFileOffset == 0)
{
KeBugCheck(MEMORY_MANAGEMENT);
return(STATUS_UNSUCCESSFUL);
}
ASSERT(PageFileIndex < MAX_PAGING_FILES);
PagingFile = PagingFileList[PageFileIndex];
if (PagingFile->FileObject == NULL || PagingFile->FileObject->DeviceObject == NULL)
{
DPRINT1("Bad paging file %u\n", PageFileIndex);
KeBugCheck(MEMORY_MANAGEMENT);
}
MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
MmBuildMdlFromPages(Mdl, &Page);
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,
Mdl,
&file_offset,
&Event,
&Iosb);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = Iosb.Status;
}
if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
{
MmUnmapLockedPages (Mdl->MappedSystemVa, Mdl);
}
return(Status);
}
VOID
INIT_FUNCTION
NTAPI
MmInitPagingFile(VOID)
{
ULONG i;
KeInitializeSpinLock(&PagingFileListLock);
MiFreeSwapPages = 0;
MiUsedSwapPages = 0;
MiReservedSwapPages = 0;
for (i = 0; i < MAX_PAGING_FILES; i++)
{
PagingFileList[i] = NULL;
}
MmNumberOfPagingFiles = 0;
}
static ULONG
MiAllocPageFromPagingFile(PPAGINGFILE PagingFile)
{
KIRQL oldIrql;
ULONG i, j;
KeAcquireSpinLock(&PagingFile->AllocMapLock, &oldIrql);
for (i = 0; i < PagingFile->AllocMapSize; i++)
{
for (j = 0; j < 32; j++)
{
if (!(PagingFile->AllocMap[i] & (1 << j)))
{
PagingFile->AllocMap[i] |= (1 << j);
PagingFile->UsedPages++;
PagingFile->FreePages--;
KeReleaseSpinLock(&PagingFile->AllocMapLock, oldIrql);
return((i * 32) + j);
}
}
}
KeReleaseSpinLock(&PagingFile->AllocMapLock, oldIrql);
return(0xFFFFFFFF);
}
VOID
NTAPI
MmFreeSwapPage(SWAPENTRY Entry)
{
ULONG i;
ULONG_PTR off;
KIRQL oldIrql;
i = FILE_FROM_ENTRY(Entry);
off = OFFSET_FROM_ENTRY(Entry) - 1;
KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
if (PagingFileList[i] == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
KeAcquireSpinLockAtDpcLevel(&PagingFileList[i]->AllocMapLock);
PagingFileList[i]->AllocMap[off >> 5] &= (~(1 << (off % 32)));
PagingFileList[i]->FreePages++;
PagingFileList[i]->UsedPages--;
MiFreeSwapPages++;
MiUsedSwapPages--;
KeReleaseSpinLockFromDpcLevel(&PagingFileList[i]->AllocMapLock);
KeReleaseSpinLock(&PagingFileListLock, oldIrql);
}
SWAPENTRY
NTAPI
MmAllocSwapPage(VOID)
{
KIRQL oldIrql;
ULONG i;
ULONG off;
SWAPENTRY entry;
KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
if (MiFreeSwapPages == 0)
{
KeReleaseSpinLock(&PagingFileListLock, oldIrql);
return(0);
}
for (i = 0; i < MAX_PAGING_FILES; i++)
{
if (PagingFileList[i] != NULL &&
PagingFileList[i]->FreePages >= 1)
{
off = MiAllocPageFromPagingFile(PagingFileList[i]);
if (off == 0xFFFFFFFF)
{
KeBugCheck(MEMORY_MANAGEMENT);
KeReleaseSpinLock(&PagingFileListLock, oldIrql);
return(STATUS_UNSUCCESSFUL);
}
MiUsedSwapPages++;
MiFreeSwapPages--;
KeReleaseSpinLock(&PagingFileListLock, oldIrql);
entry = ENTRY_FROM_FILE_OFFSET(i, off + 1);
return(entry);
}
}
KeReleaseSpinLock(&PagingFileListLock, oldIrql);
KeBugCheck(MEMORY_MANAGEMENT);
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,
IN PLARGE_INTEGER MaximumSize,
IN ULONG Reserved)
{
NTSTATUS Status;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE FileHandle;
IO_STATUS_BLOCK IoStatus;
PFILE_OBJECT FileObject;
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;
DPRINT("NtCreatePagingFile(FileName %wZ, InitialSize %I64d)\n",
FileName, InitialSize->QuadPart);
if (MmNumberOfPagingFiles >= MAX_PAGING_FILES)
{
return(STATUS_TOO_MANY_PAGING_FILES);
}
PreviousMode = ExGetPreviousMode();
if (PreviousMode != KernelMode)
{
_SEH2_TRY
{
SafeInitialSize = ProbeForReadLargeInteger(InitialSize);
SafeMaximumSize = ProbeForReadLargeInteger(MaximumSize);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Return the exception code */
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
}
else
{
SafeInitialSize = *InitialSize;
SafeMaximumSize = *MaximumSize;
}
/* Pagefiles can't be larger than 4GB and ofcourse the minimum should be
smaller than the maximum */
if (0 != SafeInitialSize.u.HighPart)
{
return STATUS_INVALID_PARAMETER_2;
}
if (0 != SafeMaximumSize.u.HighPart)
{
return STATUS_INVALID_PARAMETER_3;
}
if (SafeMaximumSize.u.LowPart < SafeInitialSize.u.LowPart)
{
return STATUS_INVALID_PARAMETER_MIX;
}
Status = ProbeAndCaptureUnicodeString(&CapturedFileName,
PreviousMode,
FileName);
if (!NT_SUCCESS(Status))
{
return(Status);
}
InitializeObjectAttributes(&ObjectAttributes,
&CapturedFileName,
OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = IoCreateFile(&FileHandle,
FILE_ALL_ACCESS,
&ObjectAttributes,
&IoStatus,
NULL,
0,
0,
FILE_OPEN_IF,
FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0,
CreateFileTypeNone,
NULL,
SL_OPEN_PAGING_FILE | IO_NO_PARAMETER_CHECKING);
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
if (!NT_SUCCESS(Status))
{
return(Status);
}
Status = ZwQueryVolumeInformationFile(FileHandle,
&IoStatus,
&FsSizeInformation,
sizeof(FILE_FS_SIZE_INFORMATION),
FileFsSizeInformation);
if (!NT_SUCCESS(Status))
{
ZwClose(FileHandle);
return Status;
}
BytesPerAllocationUnit = FsSizeInformation.SectorsPerAllocationUnit *
FsSizeInformation.BytesPerSector;
/* FIXME: If we have 2048 BytesPerAllocationUnit (FAT16 < 128MB) there is
* a problem if the paging file is fragmented. Suppose the first cluster
* of the paging file is cluster 3042 but cluster 3043 is NOT part of the
* paging file but of another file. We can't write a complete page (4096
* bytes) to the physical location of cluster 3042 then. */
if (BytesPerAllocationUnit % PAGE_SIZE)
{
DPRINT1("BytesPerAllocationUnit %lu is not a multiple of PAGE_SIZE %d\n",
BytesPerAllocationUnit, PAGE_SIZE);
ZwClose(FileHandle);
return STATUS_UNSUCCESSFUL;
}
Status = ZwSetInformationFile(FileHandle,
&IoStatus,
&SafeInitialSize,
sizeof(LARGE_INTEGER),
FileAllocationInformation);
if (!NT_SUCCESS(Status))
{
ZwClose(FileHandle);
return(Status);
}
Status = ObReferenceObjectByHandle(FileHandle,
FILE_ALL_ACCESS,
IoFileObjectType,
KernelMode,
(PVOID*)&FileObject,
NULL);
if (!NT_SUCCESS(Status))
{
ZwClose(FileHandle);
return(Status);
}
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);
}
RtlZeroMemory(PagingFile, sizeof(*PagingFile));
PagingFile->FileObject = FileObject;
PagingFile->MaximumSize.QuadPart = SafeMaximumSize.QuadPart;
PagingFile->CurrentSize.QuadPart = SafeInitialSize.QuadPart;
PagingFile->FreePages = (ULONG)(SafeInitialSize.QuadPart / PAGE_SIZE);
PagingFile->UsedPages = 0;
KeInitializeSpinLock(&PagingFile->AllocMapLock);
AllocMapSize = (PagingFile->FreePages / 32) + 1;
PagingFile->AllocMap = ExAllocatePool(NonPagedPool,
AllocMapSize * sizeof(ULONG));
PagingFile->AllocMapSize = AllocMapSize;
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);
return(STATUS_NO_MEMORY);
}
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++)
{
if (PagingFileList[i] == NULL)
{
PagingFileList[i] = PagingFile;
break;
}
}
MiFreeSwapPages = MiFreeSwapPages + PagingFile->FreePages;
MmNumberOfPagingFiles++;
KeReleaseSpinLock(&PagingFileListLock, oldIrql);
ZwClose(FileHandle);
MmSwapSpaceMessage = FALSE;
return(STATUS_SUCCESS);
}
/* EOF */
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