* FILE: ntoskrnl/mm/pagefile.c
* PURPOSE: Paging file functions
* PROGRAMMER: David Welch (welch@mcmail.com)
+ * Pierre Schweitzer
* UPDATE HISTORY:
* Created 22/05/98
*/
#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];
+PMMPAGING_FILE MmPagingFile[MAX_PAGING_FILES];
/* Lock for examining the list of paging files */
-static KSPIN_LOCK PagingFileListLock;
+KGUARDED_MUTEX MmPageFileCreationLock;
/* Number of paging files */
ULONG MmNumberOfPagingFiles;
for (i = 0; i < MmNumberOfPagingFiles; i++)
{
/* Check if this is one of them */
- if (PagingFileList[i]->FileObject == FileObject) return TRUE;
+ if (MmPagingFile[i]->FileObject == FileObject) return TRUE;
}
/* Nothing found */
}
}
-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)
i = FILE_FROM_ENTRY(SwapEntry);
offset = OFFSET_FROM_ENTRY(SwapEntry) - 1;
- if (PagingFileList[i]->FileObject == NULL ||
- PagingFileList[i]->FileObject->DeviceObject == NULL)
+ if (MmPagingFile[i]->FileObject == NULL ||
+ MmPagingFile[i]->FileObject->DeviceObject == NULL)
{
DPRINT1("Bad paging file 0x%.8X\n", SwapEntry);
KeBugCheck(MEMORY_MANAGEMENT);
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,
+ Status = IoSynchronousPageWrite(MmPagingFile[i]->FileObject,
Mdl,
&file_offset,
&Event,
KEVENT Event;
UCHAR MdlBase[sizeof(MDL) + sizeof(ULONG)];
PMDL Mdl = (PMDL)MdlBase;
- PPAGINGFILE PagingFile;
+ PMMPAGING_FILE PagingFile;
DPRINT("MiReadSwapFile\n");
ASSERT(PageFileIndex < MAX_PAGING_FILES);
- PagingFile = PagingFileList[PageFileIndex];
+ PagingFile = MmPagingFile[PageFileIndex];
if (PagingFile->FileObject == NULL || PagingFile->FileObject->DeviceObject == NULL)
{
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,
{
ULONG i;
- KeInitializeSpinLock(&PagingFileListLock);
+ KeInitializeGuardedMutex(&MmPageFileCreationLock);
MiFreeSwapPages = 0;
MiUsedSwapPages = 0;
for (i = 0; i < MAX_PAGING_FILES; i++)
{
- PagingFileList[i] = NULL;
+ MmPagingFile[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;
+ PMMPAGING_FILE PagingFile;
i = FILE_FROM_ENTRY(Entry);
off = OFFSET_FROM_ENTRY(Entry) - 1;
- KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
- if (PagingFileList[i] == NULL)
+ KeAcquireGuardedMutex(&MmPageFileCreationLock);
+
+ PagingFile = MmPagingFile[i];
+ if (PagingFile == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
- KeAcquireSpinLockAtDpcLevel(&PagingFileList[i]->AllocMapLock);
- PagingFileList[i]->AllocMap[off >> 5] &= (~(1 << (off % 32)));
+ RtlClearBit(PagingFile->Bitmap, off >> 5);
- PagingFileList[i]->FreePages++;
- PagingFileList[i]->UsedPages--;
+ PagingFile->FreeSpace++;
+ PagingFile->CurrentUsage--;
MiFreeSwapPages++;
MiUsedSwapPages--;
- KeReleaseSpinLockFromDpcLevel(&PagingFileList[i]->AllocMapLock);
- KeReleaseSpinLock(&PagingFileListLock, oldIrql);
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
}
SWAPENTRY
NTAPI
MmAllocSwapPage(VOID)
{
- KIRQL oldIrql;
ULONG i;
ULONG off;
SWAPENTRY entry;
- KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
+ KeAcquireGuardedMutex(&MmPageFileCreationLock);
if (MiFreeSwapPages == 0)
{
- KeReleaseSpinLock(&PagingFileListLock, oldIrql);
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
return(0);
}
for (i = 0; i < MAX_PAGING_FILES; i++)
{
- if (PagingFileList[i] != NULL &&
- PagingFileList[i]->FreePages >= 1)
+ if (MmPagingFile[i] != NULL &&
+ MmPagingFile[i]->FreeSpace >= 1)
{
- off = MiAllocPageFromPagingFile(PagingFileList[i]);
+ off = RtlFindClearBitsAndSet(MmPagingFile[i]->Bitmap, 1, 0);
if (off == 0xFFFFFFFF)
{
KeBugCheck(MEMORY_MANAGEMENT);
- KeReleaseSpinLock(&PagingFileListLock, oldIrql);
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
return(STATUS_UNSUCCESSFUL);
}
MiUsedSwapPages++;
MiFreeSwapPages--;
- KeReleaseSpinLock(&PagingFileListLock, oldIrql);
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
entry = ENTRY_FROM_FILE_OFFSET(i, off + 1);
return(entry);
}
}
- KeReleaseSpinLock(&PagingFileListLock, oldIrql);
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
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 MinimumSize,
IN PLARGE_INTEGER MaximumSize,
IN ULONG Reserved)
{
HANDLE FileHandle;
IO_STATUS_BLOCK IoStatus;
PFILE_OBJECT FileObject;
- PPAGINGFILE PagingFile;
- KIRQL oldIrql;
+ PMMPAGING_FILE PagingFile;
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;
+ UNICODE_STRING PageFileName;
+ LARGE_INTEGER SafeMinimumSize, SafeMaximumSize, AllocationSize;
+ FILE_FS_DEVICE_INFORMATION FsDeviceInfo;
+ SECURITY_DESCRIPTOR SecurityDescriptor;
+ PACL Dacl;
+ PWSTR Buffer;
+ DEVICE_TYPE DeviceType;
- DPRINT("NtCreatePagingFile(FileName %wZ, InitialSize %I64d)\n",
- FileName, InitialSize->QuadPart);
+ DPRINT("NtCreatePagingFile(FileName %wZ, MinimumSize %I64d)\n",
+ FileName, MinimumSize->QuadPart);
+
+ PAGED_CODE();
if (MmNumberOfPagingFiles >= MAX_PAGING_FILES)
{
- return(STATUS_TOO_MANY_PAGING_FILES);
+ return STATUS_TOO_MANY_PAGING_FILES;
}
PreviousMode = ExGetPreviousMode();
if (PreviousMode != KernelMode)
{
+ if (SeSinglePrivilegeCheck(SeCreatePagefilePrivilege, PreviousMode) != TRUE)
+ {
+ return STATUS_PRIVILEGE_NOT_HELD;
+ }
+
_SEH2_TRY
{
- SafeInitialSize = ProbeForReadLargeInteger(InitialSize);
+ SafeMinimumSize = ProbeForReadLargeInteger(MinimumSize);
SafeMaximumSize = ProbeForReadLargeInteger(MaximumSize);
+
+ PageFileName.Length = FileName->Length;
+ PageFileName.MaximumLength = FileName->MaximumLength;
+ PageFileName.Buffer = FileName->Buffer;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
}
else
{
- SafeInitialSize = *InitialSize;
+ SafeMinimumSize = *MinimumSize;
SafeMaximumSize = *MaximumSize;
+
+ PageFileName.Length = FileName->Length;
+ PageFileName.MaximumLength = FileName->MaximumLength;
+ PageFileName.Buffer = FileName->Buffer;
}
/* Pagefiles can't be larger than 4GB and ofcourse the minimum should be
smaller than the maximum */
- if (0 != SafeInitialSize.u.HighPart)
+ if (0 != SafeMinimumSize.u.HighPart)
{
return STATUS_INVALID_PARAMETER_2;
}
{
return STATUS_INVALID_PARAMETER_3;
}
- if (SafeMaximumSize.u.LowPart < SafeInitialSize.u.LowPart)
+ if (SafeMaximumSize.u.LowPart < SafeMinimumSize.u.LowPart)
{
return STATUS_INVALID_PARAMETER_MIX;
}
- Status = ProbeAndCaptureUnicodeString(&CapturedFileName,
- PreviousMode,
- FileName);
- if (!NT_SUCCESS(Status))
+ /* Validate name length */
+ if (PageFileName.Length > 128 * sizeof(WCHAR))
{
- return(Status);
+ return STATUS_OBJECT_NAME_INVALID;
}
- InitializeObjectAttributes(&ObjectAttributes,
- &CapturedFileName,
- OBJ_KERNEL_HANDLE,
- NULL,
- NULL);
+ /* We won't care about any potential UNICODE_NULL */
+ PageFileName.MaximumLength = PageFileName.Length;
+ /* Allocate a buffer to keep name copy */
+ Buffer = ExAllocatePoolWithTag(PagedPool, PageFileName.Length, TAG_MM);
+ if (Buffer == NULL)
+ {
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
- 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);
+ /* Copy name */
+ if (PreviousMode != KernelMode)
+ {
+ _SEH2_TRY
+ {
+ if (PageFileName.Length != 0)
+ {
+ ProbeForRead(PageFileName.Buffer, PageFileName.Length, sizeof(WCHAR));
+ }
- ReleaseCapturedUnicodeString(&CapturedFileName,
- PreviousMode);
- if (!NT_SUCCESS(Status))
+ RtlCopyMemory(Buffer, PageFileName.Buffer, PageFileName.Length);
+ }
+ _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
+ {
+ ExFreePoolWithTag(Buffer, TAG_MM);
+
+ /* Return the exception code */
+ _SEH2_YIELD(return _SEH2_GetExceptionCode());
+ }
+ _SEH2_END;
+ }
+ else
{
- return(Status);
+ RtlCopyMemory(Buffer, PageFileName.Buffer, PageFileName.Length);
}
- Status = ZwQueryVolumeInformationFile(FileHandle,
- &IoStatus,
- &FsSizeInformation,
- sizeof(FILE_FS_SIZE_INFORMATION),
- FileFsSizeInformation);
+ /* Erase caller's buffer with ours */
+ PageFileName.Buffer = Buffer;
+
+ /* Create the security descriptor for the page file */
+ Status = RtlCreateSecurityDescriptor(&SecurityDescriptor, SECURITY_DESCRIPTOR_REVISION);
if (!NT_SUCCESS(Status))
{
- ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
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)
+ /* Create the DACL: we will only allow two SIDs */
+ Count = sizeof(ACL) + (sizeof(ACE) + RtlLengthSid(SeLocalSystemSid)) +
+ (sizeof(ACE) + RtlLengthSid(SeAliasAdminsSid));
+ Dacl = ExAllocatePoolWithTag(PagedPool, Count, 'lcaD');
+ if (Dacl == NULL)
{
- DPRINT1("BytesPerAllocationUnit %lu is not a multiple of PAGE_SIZE %d\n",
- BytesPerAllocationUnit, PAGE_SIZE);
- ZwClose(FileHandle);
- return STATUS_UNSUCCESSFUL;
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_INSUFFICIENT_RESOURCES;
}
- Status = ZwSetInformationFile(FileHandle,
- &IoStatus,
- &SafeInitialSize,
- sizeof(LARGE_INTEGER),
- FileAllocationInformation);
+ /* Initialize the DACL */
+ Status = RtlCreateAcl(Dacl, Count, ACL_REVISION);
if (!NT_SUCCESS(Status))
{
- ZwClose(FileHandle);
- return(Status);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
- Status = ObReferenceObjectByHandle(FileHandle,
- FILE_ALL_ACCESS,
- IoFileObjectType,
- KernelMode,
- (PVOID*)&FileObject,
- NULL);
+ /* Grant full access to admins */
+ Status = RtlAddAccessAllowedAce(Dacl, ACL_REVISION, FILE_ALL_ACCESS, SeAliasAdminsSid);
if (!NT_SUCCESS(Status))
{
- ZwClose(FileHandle);
- return(Status);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
- CurrentRetDescList = RetDescList = MmAllocRetrievelDescriptorList(PAIRS_PER_RUN);
+ /* Grant full access to SYSTEM */
+ Status = RtlAddAccessAllowedAce(Dacl, ACL_REVISION, FILE_ALL_ACCESS, SeLocalSystemSid);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
+ }
- if (CurrentRetDescList == NULL)
+ /* Attach the DACL to the security descriptor */
+ Status = RtlSetDaclSecurityDescriptor(&SecurityDescriptor, TRUE, Dacl, FALSE);
+ if (!NT_SUCCESS(Status))
{
- ObDereferenceObject(FileObject);
- ZwClose(FileHandle);
- return(STATUS_NO_MEMORY);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
-#if defined(__GNUC__)
- Vcn.QuadPart = 0LL;
-#else
+ InitializeObjectAttributes(&ObjectAttributes,
+ &PageFileName,
+ OBJ_KERNEL_HANDLE,
+ NULL,
+ &SecurityDescriptor);
- Vcn.QuadPart = 0;
-#endif
+ /* Make sure we can at least store a complete page:
+ * 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. */
+ AllocationSize.QuadPart = SafeMinimumSize.QuadPart + PAGE_SIZE;
- 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));
+ /* First, attempt to replace the page file, if existing */
+ Status = IoCreateFile(&FileHandle,
+ SYNCHRONIZE | WRITE_DAC | FILE_READ_DATA | FILE_WRITE_DATA,
+ &ObjectAttributes,
+ &IoStatus,
+ &AllocationSize,
+ FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN,
+ FILE_SHARE_WRITE,
+ FILE_SUPERSEDE,
+ FILE_DELETE_ON_CLOSE | FILE_NO_COMPRESSION | FILE_NO_INTERMEDIATE_BUFFERING,
+ NULL,
+ 0,
+ CreateFileTypeNone,
+ NULL,
+ SL_OPEN_PAGING_FILE | IO_NO_PARAMETER_CHECKING);
+ /* If we failed, relax a bit constraints, someone may be already holding the
+ * the file, so share write, don't attempt to replace and don't delete on close
+ * (basically, don't do anything conflicting)
+ * This can happen if the caller attempts to extend a page file.
+ */
+ if (!NT_SUCCESS(Status))
+ {
+ ULONG i;
+
+ Status = IoCreateFile(&FileHandle,
+ SYNCHRONIZE | FILE_WRITE_DATA,
+ &ObjectAttributes,
+ &IoStatus,
+ &AllocationSize,
+ FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN,
+ FILE_SHARE_WRITE | FILE_SHARE_READ,
+ FILE_OPEN,
+ FILE_NO_COMPRESSION | FILE_NO_INTERMEDIATE_BUFFERING,
+ NULL,
+ 0,
+ CreateFileTypeNone,
+ NULL,
+ SL_OPEN_PAGING_FILE | IO_NO_PARAMETER_CHECKING);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
+ }
+
+ /* We opened it! Check we are that "someone" ;-)
+ * First, get the opened file object.
+ */
+ Status = ObReferenceObjectByHandle(FileHandle,
+ FILE_READ_DATA | FILE_WRITE_DATA,
+ IoFileObjectType,
+ KernelMode,
+ (PVOID*)&FileObject,
+ NULL);
if (!NT_SUCCESS(Status))
{
- while (RetDescList)
- {
- CurrentRetDescList = RetDescList;
- RetDescList = RetDescList->Next;
- ExFreePool(CurrentRetDescList);
- }
- ObDereferenceObject(FileObject);
ZwClose(FileHandle);
- return(Status);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
- ExtentCount += CurrentRetDescList->RetrievalPointers.ExtentCount;
- if (CurrentRetDescList->RetrievalPointers.Extents[CurrentRetDescList->RetrievalPointers.ExtentCount-1].NextVcn.QuadPart < MaxVcn.QuadPart)
+
+ /* Find if it matches a previous page file */
+ PagingFile = NULL;
+
+ /* FIXME: should be calling unsafe instead,
+ * we should already be in a guarded region
+ */
+ KeAcquireGuardedMutex(&MmPageFileCreationLock);
+ if (MmNumberOfPagingFiles > 0)
{
- CurrentRetDescList->Next = MmAllocRetrievelDescriptorList(PAIRS_PER_RUN);
- if (CurrentRetDescList->Next == NULL)
+ i = 0;
+
+ while (MmPagingFile[i]->FileObject->SectionObjectPointer != FileObject->SectionObjectPointer)
{
- while (RetDescList)
+ ++i;
+ if (i >= MmNumberOfPagingFiles)
{
- CurrentRetDescList = RetDescList;
- RetDescList = RetDescList->Next;
- ExFreePool(CurrentRetDescList);
+ break;
}
- ObDereferenceObject(FileObject);
- ZwClose(FileHandle);
- return(STATUS_NO_MEMORY);
}
- Vcn = CurrentRetDescList->RetrievalPointers.Extents[CurrentRetDescList->RetrievalPointers.ExtentCount-1].NextVcn;
- CurrentRetDescList = CurrentRetDescList->Next;
+
+ /* This is the matching page file */
+ PagingFile = MmPagingFile[i];
+ }
+
+ /* If we didn't find the page file, fail */
+ if (PagingFile == NULL)
+ {
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
+ ObDereferenceObject(FileObject);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_NOT_FOUND;
}
- else
+
+ /* Don't allow page file shrinking */
+ if (PagingFile->MinimumSize > (SafeMinimumSize.QuadPart >> PAGE_SHIFT))
{
- break;
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
+ ObDereferenceObject(FileObject);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_INVALID_PARAMETER_2;
}
- }
- PagingFile = ExAllocatePool(NonPagedPool, sizeof(*PagingFile));
- if (PagingFile == NULL)
- {
- while (RetDescList)
+ if ((SafeMaximumSize.QuadPart >> PAGE_SHIFT) < PagingFile->MaximumSize)
{
- CurrentRetDescList = RetDescList;
- RetDescList = RetDescList->Next;
- ExFreePool(CurrentRetDescList);
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
+ ObDereferenceObject(FileObject);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_INVALID_PARAMETER_3;
}
+
+ /* FIXME: implement parameters checking and page file extension */
+ UNIMPLEMENTED;
+
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
- return(STATUS_NO_MEMORY);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_NOT_IMPLEMENTED;
}
- 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 (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Failed creating page file: %lx\n", Status);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
+ }
- if (PagingFile->AllocMap == NULL)
+ /* Set the security descriptor */
+ if (NT_SUCCESS(IoStatus.Status))
{
- while (RetDescList)
+ Status = ZwSetSecurityObject(FileHandle, DACL_SECURITY_INFORMATION, &SecurityDescriptor);
+ if (!NT_SUCCESS(Status))
{
- CurrentRetDescList = RetDescList;
- RetDescList = RetDescList->Next;
- ExFreePool(CurrentRetDescList);
+ ExFreePoolWithTag(Dacl, 'lcaD');
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
- 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)
+
+ /* DACL is no longer needed, free it */
+ ExFreePoolWithTag(Dacl, 'lcaD');
+
+ /* FIXME: To enable once page file managment is moved to ARM3 */
+#if 0
+ /* Check we won't overflow commit limit with the page file */
+ if (MmTotalCommitLimitMaximum + (SafeMaximumSize.QuadPart >> PAGE_SHIFT) <= MmTotalCommitLimitMaximum)
{
- while (RetDescList)
- {
- CurrentRetDescList = RetDescList;
- RetDescList = RetDescList->Next;
- ExFreePool(CurrentRetDescList);
- }
- ExFreePool(PagingFile->AllocMap);
- ExFreePool(PagingFile);
- ObDereferenceObject(FileObject);
ZwClose(FileHandle);
- return(STATUS_NO_MEMORY);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_INVALID_PARAMETER_3;
}
+#endif
- RtlZeroMemory(PagingFile->AllocMap, AllocMapSize * sizeof(ULONG));
- RtlZeroMemory(PagingFile->RetrievalPointers, Size);
+ /* Set its end of file to minimal size */
+ Status = ZwSetInformationFile(FileHandle,
+ &IoStatus,
+ &SafeMinimumSize,
+ sizeof(LARGE_INTEGER),
+ FileEndOfFileInformation);
+ if (!NT_SUCCESS(Status) || !NT_SUCCESS(IoStatus.Status))
+ {
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
+ }
- Count = 0;
- PagingFile->RetrievalPointers->ExtentCount = ExtentCount;
- PagingFile->RetrievalPointers->StartingVcn = RetDescList->RetrievalPointers.StartingVcn;
- CurrentRetDescList = RetDescList;
- while (CurrentRetDescList)
+ Status = ObReferenceObjectByHandle(FileHandle,
+ FILE_READ_DATA | FILE_WRITE_DATA,
+ IoFileObjectType,
+ KernelMode,
+ (PVOID*)&FileObject,
+ NULL);
+ if (!NT_SUCCESS(Status))
{
- 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);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
- if (PagingFile->RetrievalPointers->ExtentCount != ExtentCount ||
- PagingFile->RetrievalPointers->Extents[ExtentCount - 1].NextVcn.QuadPart != MaxVcn.QuadPart)
+ /* Only allow page file on a few device types */
+ DeviceType = IoGetRelatedDeviceObject(FileObject)->DeviceType;
+ if (DeviceType != FILE_DEVICE_DISK_FILE_SYSTEM && DeviceType != FILE_DEVICE_NETWORK_FILE_SYSTEM &&
+ DeviceType != FILE_DEVICE_DFS_VOLUME && DeviceType != FILE_DEVICE_DFS_FILE_SYSTEM)
{
- ExFreePool(PagingFile->RetrievalPointers);
- ExFreePool(PagingFile->AllocMap);
- ExFreePool(PagingFile);
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
- return(STATUS_UNSUCCESSFUL);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return Status;
}
- /*
- * Change the entries from lcn's to volume offset's.
- */
- PagingFile->RetrievalPointers->StartingVcn.QuadPart *= BytesPerAllocationUnit;
- for (i = 0; i < ExtentCount; i++)
+ /* Deny page file creation on a floppy disk */
+ FsDeviceInfo.Characteristics = 0;
+ IoQueryVolumeInformation(FileObject, FileFsDeviceInformation, sizeof(FsDeviceInfo), &FsDeviceInfo, &Count);
+ if (BooleanFlagOn(FsDeviceInfo.Characteristics, FILE_FLOPPY_DISKETTE))
{
- PagingFile->RetrievalPointers->Extents[i].Lcn.QuadPart *= BytesPerAllocationUnit;
- PagingFile->RetrievalPointers->Extents[i].NextVcn.QuadPart *= BytesPerAllocationUnit;
+ ObDereferenceObject(FileObject);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_FLOPPY_VOLUME;
}
- KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
- for (i = 0; i < MAX_PAGING_FILES; i++)
+ PagingFile = ExAllocatePoolWithTag(NonPagedPool, sizeof(*PagingFile), TAG_MM);
+ if (PagingFile == NULL)
{
- if (PagingFileList[i] == NULL)
- {
- PagingFileList[i] = PagingFile;
- break;
- }
+ ObDereferenceObject(FileObject);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ RtlZeroMemory(PagingFile, sizeof(*PagingFile));
+
+ PagingFile->FileHandle = FileHandle;
+ PagingFile->FileObject = FileObject;
+ PagingFile->MaximumSize = (SafeMaximumSize.QuadPart >> PAGE_SHIFT);
+ PagingFile->Size = (SafeMinimumSize.QuadPart >> PAGE_SHIFT);
+ PagingFile->MinimumSize = (SafeMinimumSize.QuadPart >> PAGE_SHIFT);
+ /* 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->MaximumSize + 31) / 32) * sizeof(ULONG));
+ PagingFile->Bitmap = ExAllocatePoolWithTag(NonPagedPool,
+ AllocMapSize,
+ TAG_MM);
+ if (PagingFile->Bitmap == NULL)
+ {
+ ExFreePoolWithTag(PagingFile, TAG_MM);
+ ObDereferenceObject(FileObject);
+ ZwClose(FileHandle);
+ ExFreePoolWithTag(Buffer, TAG_MM);
+ return STATUS_INSUFFICIENT_RESOURCES;
}
- MiFreeSwapPages = MiFreeSwapPages + PagingFile->FreePages;
- MmNumberOfPagingFiles++;
- KeReleaseSpinLock(&PagingFileListLock, oldIrql);
- ZwClose(FileHandle);
+ 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
+ */
+ KeAcquireGuardedMutex(&MmPageFileCreationLock);
+ ASSERT(MmPagingFile[MmNumberOfPagingFiles] == NULL);
+ MmPagingFile[MmNumberOfPagingFiles] = PagingFile;
+ MmNumberOfPagingFiles++;
+ MiFreeSwapPages = MiFreeSwapPages + PagingFile->FreeSpace;
+ KeReleaseGuardedMutex(&MmPageFileCreationLock);
MmSwapSpaceMessage = FALSE;
- return(STATUS_SUCCESS);
+ return STATUS_SUCCESS;
}
/* EOF */
projects / reactos.git / blobdiff