return Status;
}
+/**
+* @name NtfsSetEndOfFile
+* @implemented
+*
+* Sets the end of file (file size) for a given file.
+*
+* @param Fcb
+* Pointer to an NTFS_FCB which describes the target file. Fcb->MainResource should have been
+* acquired with ExAcquireResourceSharedLite().
+*
+* @param FileObject
+* Pointer to a FILE_OBJECT describing the target file.
+*
+* @param DeviceExt
+* Points to the target disk's DEVICE_EXTENSION
+*
+* @param IrpFlags
+* ULONG describing the flags of the original IRP request (Irp->Flags).
+*
+* @param CaseSensitive
+* Boolean indicating if the function should operate in case-sensitive mode. This will be TRUE
+* if an application opened the file with the FILE_FLAG_POSIX_SEMANTICS flag.
+*
+* @param NewFileSize
+* Pointer to a LARGE_INTEGER which indicates the new end of file (file size).
+*
+* @return
+* STATUS_SUCCESS if successful,
+* STATUS_USER_MAPPED_FILE if trying to truncate a file but MmCanFileBeTruncated() returned false,
+* STATUS_OBJECT_NAME_NOT_FOUND if there was no $DATA attribute associated with the target file,
+* STATUS_INVALID_PARAMETER if there was no $FILENAME attribute associated with the target file,
+* STATUS_INSUFFICIENT_RESOURCES if an allocation failed,
+* STATUS_ACCESS_DENIED if target file is a volume or if paging is involved.
+*
+* @remarks As this function sets the size of a file at the file-level
+* (and not at the attribute level) it's not recommended to use this
+* function alongside functions that operate on the data attribute directly.
+*
+*/
+NTSTATUS
+NtfsSetEndOfFile(PNTFS_FCB Fcb,
+ PFILE_OBJECT FileObject,
+ PDEVICE_EXTENSION DeviceExt,
+ ULONG IrpFlags,
+ BOOLEAN CaseSensitive,
+ PLARGE_INTEGER NewFileSize)
+{
+ LARGE_INTEGER CurrentFileSize;
+ PFILE_RECORD_HEADER FileRecord;
+ PNTFS_ATTR_CONTEXT DataContext;
+ ULONG AttributeOffset;
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONGLONG AllocationSize;
+ PFILENAME_ATTRIBUTE fileNameAttribute;
+ ULONGLONG ParentMFTId;
+ UNICODE_STRING filename;
+
+
+ // Allocate non-paged memory for the file record
+ FileRecord = ExAllocatePoolWithTag(NonPagedPool, DeviceExt->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
+ if (FileRecord == NULL)
+ {
+ DPRINT1("Couldn't allocate memory for file record!");
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ // read the file record
+ DPRINT("Reading file record...\n");
+ Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ // We couldn't get the file's record. Free the memory and return the error
+ DPRINT1("Can't find record for %wS!\n", Fcb->ObjectName);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return Status;
+ }
+
+ DPRINT("Found record for %wS\n", Fcb->ObjectName);
+
+ CurrentFileSize.QuadPart = NtfsGetFileSize(DeviceExt, FileRecord, L"", 0, (PULONGLONG)&CurrentFileSize);
+
+ // Are we trying to decrease the file size?
+ if (NewFileSize->QuadPart < CurrentFileSize.QuadPart)
+ {
+ // Is the file mapped?
+ if (!MmCanFileBeTruncated(FileObject->SectionObjectPointer,
+ NewFileSize))
+ {
+ DPRINT1("Couldn't decrease file size!\n");
+ return STATUS_USER_MAPPED_FILE;
+ }
+ }
+
+ // Find the attribute with the data stream for our file
+ DPRINT("Finding Data Attribute...\n");
+ Status = FindAttribute(DeviceExt,
+ FileRecord,
+ AttributeData,
+ Fcb->Stream,
+ wcslen(Fcb->Stream),
+ &DataContext,
+ &AttributeOffset);
+
+ // Did we fail to find the attribute?
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("No '%S' data stream associated with file!\n", Fcb->Stream);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return Status;
+ }
+
+ // Get the size of the data attribute
+ CurrentFileSize.QuadPart = AttributeDataLength(&DataContext->Record);
+
+ // Are we enlarging the attribute?
+ if (NewFileSize->QuadPart > CurrentFileSize.QuadPart)
+ {
+ // is increasing the stream size not allowed?
+ if ((Fcb->Flags & FCB_IS_VOLUME) ||
+ (IrpFlags & IRP_PAGING_IO))
+ {
+ // TODO - just fail for now
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return STATUS_ACCESS_DENIED;
+ }
+ }
+
+ // set the attribute data length
+ Status = SetAttributeDataLength(FileObject, Fcb, DataContext, AttributeOffset, FileRecord, NewFileSize);
+ if (!NT_SUCCESS(Status))
+ {
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return Status;
+ }
+
+ // now we need to update this file's size in every directory index entry that references it
+ // TODO: expand to work with every filename / hardlink stored in the file record.
+ fileNameAttribute = GetBestFileNameFromRecord(Fcb->Vcb, FileRecord);
+ if (fileNameAttribute == NULL)
+ {
+ DPRINT1("Unable to find FileName attribute associated with file!\n");
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ ParentMFTId = fileNameAttribute->DirectoryFileReferenceNumber & NTFS_MFT_MASK;
+
+ filename.Buffer = fileNameAttribute->Name;
+ filename.Length = fileNameAttribute->NameLength * sizeof(WCHAR);
+ filename.MaximumLength = filename.Length;
+
+ AllocationSize = ROUND_UP(NewFileSize->QuadPart, Fcb->Vcb->NtfsInfo.BytesPerCluster);
+
+ Status = UpdateFileNameRecord(Fcb->Vcb,
+ ParentMFTId,
+ &filename,
+ FALSE,
+ NewFileSize->QuadPart,
+ AllocationSize,
+ CaseSensitive);
+
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+
+ return Status;
+}
+
+/**
+* @name NtfsSetInformation
+* @implemented
+*
+* Sets the specified file information.
+*
+* @param IrpContext
+* Points to an NTFS_IRP_CONTEXT which describes the set operation
+*
+* @return
+* STATUS_SUCCESS if successful,
+* STATUS_NOT_IMPLEMENTED if trying to set an unimplemented information class,
+* STATUS_USER_MAPPED_FILE if trying to truncate a file but MmCanFileBeTruncated() returned false,
+* STATUS_OBJECT_NAME_NOT_FOUND if there was no $DATA attribute associated with the target file,
+* STATUS_INVALID_PARAMETER if there was no $FILENAME attribute associated with the target file,
+* STATUS_INSUFFICIENT_RESOURCES if an allocation failed,
+* STATUS_ACCESS_DENIED if target file is a volume or if paging is involved.
+*
+* @remarks Called by NtfsDispatch() in response to an IRP_MJ_SET_INFORMATION request.
+* Only the FileEndOfFileInformation InformationClass is fully implemented. FileAllocationInformation
+* is a hack and not a true implementation, but it's enough to make SetEndOfFile() work.
+* All other information classes are TODO.
+*
+*/
+NTSTATUS
+NtfsSetInformation(PNTFS_IRP_CONTEXT IrpContext)
+{
+ FILE_INFORMATION_CLASS FileInformationClass;
+ PIO_STACK_LOCATION Stack;
+ PDEVICE_EXTENSION DeviceExt;
+ PFILE_OBJECT FileObject;
+ PNTFS_FCB Fcb;
+ PVOID SystemBuffer;
+ ULONG BufferLength;
+ PIRP Irp;
+ PDEVICE_OBJECT DeviceObject;
+ NTSTATUS Status = STATUS_NOT_IMPLEMENTED;
+
+ DPRINT1("NtfsSetInformation(%p)\n", IrpContext);
+
+ Irp = IrpContext->Irp;
+ Stack = IrpContext->Stack;
+ DeviceObject = IrpContext->DeviceObject;
+ DeviceExt = DeviceObject->DeviceExtension;
+ FileInformationClass = Stack->Parameters.QueryFile.FileInformationClass;
+ FileObject = IrpContext->FileObject;
+ Fcb = FileObject->FsContext;
+
+ SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
+ BufferLength = Stack->Parameters.QueryFile.Length;
+
+ if (!ExAcquireResourceSharedLite(&Fcb->MainResource,
+ BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT)))
+ {
+ return NtfsMarkIrpContextForQueue(IrpContext);
+ }
+
+ switch (FileInformationClass)
+ {
+ PFILE_END_OF_FILE_INFORMATION EndOfFileInfo;
+
+ /* TODO: Allocation size is not actually the same as file end for NTFS,
+ however, few applications are likely to make the distinction. */
+ case FileAllocationInformation:
+ DPRINT1("FIXME: Using hacky method of setting FileAllocationInformation.\n");
+ case FileEndOfFileInformation:
+ EndOfFileInfo = (PFILE_END_OF_FILE_INFORMATION)SystemBuffer;
+ Status = NtfsSetEndOfFile(Fcb,
+ FileObject,
+ DeviceExt,
+ Irp->Flags,
+ (Stack->Flags & SL_CASE_SENSITIVE),
+ &EndOfFileInfo->EndOfFile);
+ break;
+
+ // TODO: all other information classes
+
+ default:
+ DPRINT1("FIXME: Unimplemented information class %u\n", FileInformationClass);
+ Status = STATUS_NOT_IMPLEMENTED;
+ }
+
+ ExReleaseResourceLite(&Fcb->MainResource);
+
+ if (NT_SUCCESS(Status))
+ Irp->IoStatus.Information =
+ Stack->Parameters.QueryFile.Length - BufferLength;
+ else
+ Irp->IoStatus.Information = 0;
+
+ return Status;
+}
/* EOF */
projects / reactos.git / blobdiff