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reactos/drivers/filesystems/ntfs/finfo.c
Pierre Schweitzer 216a2cae73
[NTFS] Use LookasideList allocations for FILE_RECORD_HEADER. 
TODO: use a specific tag

This, and previous commit, should speed up a bit the driver until caching gets implemented
2017-12-31 14:14:24 +01:00

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/*
* ReactOS kernel
* Copyright (C) 2002 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/filesystem/ntfs/dirctl.c
* PURPOSE: NTFS filesystem driver
* PROGRAMMERS: Eric Kohl
* Hervé Poussineau (hpoussin@reactos.org)
* Pierre Schweitzer (pierre@reactos.org)
*/
/* INCLUDES *****************************************************************/
#include "ntfs.h"
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ****************************************************************/
/*
* FUNCTION: Retrieve the standard file information
*/
static
NTSTATUS
NtfsGetStandardInformation(PNTFS_FCB Fcb,
PDEVICE_OBJECT DeviceObject,
PFILE_STANDARD_INFORMATION StandardInfo,
PULONG BufferLength)
{
UNREFERENCED_PARAMETER(DeviceObject);
DPRINT1("NtfsGetStandardInformation(%p, %p, %p, %p)\n", Fcb, DeviceObject, StandardInfo, BufferLength);
if (*BufferLength < sizeof(FILE_STANDARD_INFORMATION))
return STATUS_BUFFER_TOO_SMALL;
/* PRECONDITION */
ASSERT(StandardInfo != NULL);
ASSERT(Fcb != NULL);
RtlZeroMemory(StandardInfo,
sizeof(FILE_STANDARD_INFORMATION));
StandardInfo->AllocationSize = Fcb->RFCB.AllocationSize;
StandardInfo->EndOfFile = Fcb->RFCB.FileSize;
StandardInfo->NumberOfLinks = Fcb->LinkCount;
StandardInfo->DeletePending = FALSE;
StandardInfo->Directory = NtfsFCBIsDirectory(Fcb);
*BufferLength -= sizeof(FILE_STANDARD_INFORMATION);
return STATUS_SUCCESS;
}
static
NTSTATUS
NtfsGetPositionInformation(PFILE_OBJECT FileObject,
PFILE_POSITION_INFORMATION PositionInfo,
PULONG BufferLength)
{
DPRINT1("NtfsGetPositionInformation(%p, %p, %p)\n", FileObject, PositionInfo, BufferLength);
if (*BufferLength < sizeof(FILE_POSITION_INFORMATION))
return STATUS_BUFFER_TOO_SMALL;
PositionInfo->CurrentByteOffset.QuadPart = FileObject->CurrentByteOffset.QuadPart;
DPRINT("Getting position %I64x\n",
PositionInfo->CurrentByteOffset.QuadPart);
*BufferLength -= sizeof(FILE_POSITION_INFORMATION);
return STATUS_SUCCESS;
}
static
NTSTATUS
NtfsGetBasicInformation(PFILE_OBJECT FileObject,
PNTFS_FCB Fcb,
PDEVICE_OBJECT DeviceObject,
PFILE_BASIC_INFORMATION BasicInfo,
PULONG BufferLength)
{
PFILENAME_ATTRIBUTE FileName = &Fcb->Entry;
DPRINT1("NtfsGetBasicInformation(%p, %p, %p, %p, %p)\n", FileObject, Fcb, DeviceObject, BasicInfo, BufferLength);
if (*BufferLength < sizeof(FILE_BASIC_INFORMATION))
return STATUS_BUFFER_TOO_SMALL;
BasicInfo->CreationTime.QuadPart = FileName->CreationTime;
BasicInfo->LastAccessTime.QuadPart = FileName->LastAccessTime;
BasicInfo->LastWriteTime.QuadPart = FileName->LastWriteTime;
BasicInfo->ChangeTime.QuadPart = FileName->ChangeTime;
NtfsFileFlagsToAttributes(FileName->FileAttributes, &BasicInfo->FileAttributes);
*BufferLength -= sizeof(FILE_BASIC_INFORMATION);
return STATUS_SUCCESS;
}
/*
* FUNCTION: Retrieve the file name information
*/
static
NTSTATUS
NtfsGetNameInformation(PFILE_OBJECT FileObject,
PNTFS_FCB Fcb,
PDEVICE_OBJECT DeviceObject,
PFILE_NAME_INFORMATION NameInfo,
PULONG BufferLength)
{
ULONG BytesToCopy;
UNREFERENCED_PARAMETER(FileObject);
UNREFERENCED_PARAMETER(DeviceObject);
DPRINT1("NtfsGetNameInformation(%p, %p, %p, %p, %p)\n", FileObject, Fcb, DeviceObject, NameInfo, BufferLength);
ASSERT(NameInfo != NULL);
ASSERT(Fcb != NULL);
/* If buffer can't hold at least the file name length, bail out */
if (*BufferLength < (ULONG)FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]))
return STATUS_BUFFER_TOO_SMALL;
/* Save file name length, and as much file len, as buffer length allows */
NameInfo->FileNameLength = wcslen(Fcb->PathName) * sizeof(WCHAR);
/* Calculate amount of bytes to copy not to overflow the buffer */
BytesToCopy = min(NameInfo->FileNameLength,
*BufferLength - FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]));
/* Fill in the bytes */
RtlCopyMemory(NameInfo->FileName, Fcb->PathName, BytesToCopy);
/* Check if we could write more but are not able to */
if (*BufferLength < NameInfo->FileNameLength + (ULONG)FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]))
{
/* Return number of bytes written */
*BufferLength -= FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]) + BytesToCopy;
return STATUS_BUFFER_OVERFLOW;
}
/* We filled up as many bytes, as needed */
*BufferLength -= (FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]) + NameInfo->FileNameLength);
return STATUS_SUCCESS;
}
static
NTSTATUS
NtfsGetInternalInformation(PNTFS_FCB Fcb,
PFILE_INTERNAL_INFORMATION InternalInfo,
PULONG BufferLength)
{
DPRINT1("NtfsGetInternalInformation(%p, %p, %p)\n", Fcb, InternalInfo, BufferLength);
ASSERT(InternalInfo);
ASSERT(Fcb);
if (*BufferLength < sizeof(FILE_INTERNAL_INFORMATION))
return STATUS_BUFFER_TOO_SMALL;
InternalInfo->IndexNumber.QuadPart = Fcb->MFTIndex;
*BufferLength -= sizeof(FILE_INTERNAL_INFORMATION);
return STATUS_SUCCESS;
}
static
NTSTATUS
NtfsGetNetworkOpenInformation(PNTFS_FCB Fcb,
PDEVICE_EXTENSION DeviceExt,
PFILE_NETWORK_OPEN_INFORMATION NetworkInfo,
PULONG BufferLength)
{
PFILENAME_ATTRIBUTE FileName = &Fcb->Entry;
DPRINT1("NtfsGetNetworkOpenInformation(%p, %p, %p, %p)\n", Fcb, DeviceExt, NetworkInfo, BufferLength);
if (*BufferLength < sizeof(FILE_NETWORK_OPEN_INFORMATION))
return STATUS_BUFFER_TOO_SMALL;
NetworkInfo->CreationTime.QuadPart = FileName->CreationTime;
NetworkInfo->LastAccessTime.QuadPart = FileName->LastAccessTime;
NetworkInfo->LastWriteTime.QuadPart = FileName->LastWriteTime;
NetworkInfo->ChangeTime.QuadPart = FileName->ChangeTime;
NetworkInfo->EndOfFile = Fcb->RFCB.FileSize;
NetworkInfo->AllocationSize = Fcb->RFCB.AllocationSize;
NtfsFileFlagsToAttributes(FileName->FileAttributes, &NetworkInfo->FileAttributes);
*BufferLength -= sizeof(FILE_NETWORK_OPEN_INFORMATION);
return STATUS_SUCCESS;
}
static
NTSTATUS
NtfsGetSteamInformation(PNTFS_FCB Fcb,
PDEVICE_EXTENSION DeviceExt,
PFILE_STREAM_INFORMATION StreamInfo,
PULONG BufferLength)
{
ULONG CurrentSize;
FIND_ATTR_CONTXT Context;
PNTFS_ATTR_RECORD Attribute;
NTSTATUS Status, BrowseStatus;
PFILE_RECORD_HEADER FileRecord;
PFILE_STREAM_INFORMATION CurrentInfo = StreamInfo, Previous = NULL;
if (*BufferLength < sizeof(FILE_STREAM_INFORMATION))
return STATUS_BUFFER_TOO_SMALL;
FileRecord = ExAllocateFromNPagedLookasideList(&DeviceExt->FileRecLookasideList);
if (FileRecord == NULL)
{
DPRINT1("Not enough memory!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("Can't find record!\n");
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
return Status;
}
BrowseStatus = FindFirstAttribute(&Context, DeviceExt, FileRecord, FALSE, &Attribute);
while (NT_SUCCESS(BrowseStatus))
{
if (Attribute->Type == AttributeData)
{
CurrentSize = FIELD_OFFSET(FILE_STREAM_INFORMATION, StreamName) + Attribute->NameLength * sizeof(WCHAR) + wcslen(L"::$DATA") * sizeof(WCHAR);
if (CurrentSize > *BufferLength)
{
Status = STATUS_BUFFER_OVERFLOW;
break;
}
CurrentInfo->NextEntryOffset = 0;
CurrentInfo->StreamNameLength = (Attribute->NameLength + wcslen(L"::$DATA")) * sizeof(WCHAR);
CurrentInfo->StreamSize.QuadPart = AttributeDataLength(Attribute);
CurrentInfo->StreamAllocationSize.QuadPart = AttributeAllocatedLength(Attribute);
CurrentInfo->StreamName[0] = L':';
RtlMoveMemory(&CurrentInfo->StreamName[1], (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset), CurrentInfo->StreamNameLength);
RtlMoveMemory(&CurrentInfo->StreamName[Attribute->NameLength + 1], L":$DATA", sizeof(L":$DATA") - sizeof(UNICODE_NULL));
if (Previous != NULL)
{
Previous->NextEntryOffset = (ULONG_PTR)CurrentInfo - (ULONG_PTR)Previous;
}
Previous = CurrentInfo;
CurrentInfo = (PFILE_STREAM_INFORMATION)((ULONG_PTR)CurrentInfo + CurrentSize);
*BufferLength -= CurrentSize;
}
BrowseStatus = FindNextAttribute(&Context, &Attribute);
}
FindCloseAttribute(&Context);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
return Status;
}
// Convert enum value to friendly name
const PCSTR
GetInfoClassName(FILE_INFORMATION_CLASS infoClass)
{
const PCSTR fileInfoClassNames[] = { "???????",
"FileDirectoryInformation",
"FileFullDirectoryInformation",
"FileBothDirectoryInformation",
"FileBasicInformation",
"FileStandardInformation",
"FileInternalInformation",
"FileEaInformation",
"FileAccessInformation",
"FileNameInformation",
"FileRenameInformation",
"FileLinkInformation",
"FileNamesInformation",
"FileDispositionInformation",
"FilePositionInformation",
"FileFullEaInformation",
"FileModeInformation",
"FileAlignmentInformation",
"FileAllInformation",
"FileAllocationInformation",
"FileEndOfFileInformation",
"FileAlternateNameInformation",
"FileStreamInformation",
"FilePipeInformation",
"FilePipeLocalInformation",
"FilePipeRemoteInformation",
"FileMailslotQueryInformation",
"FileMailslotSetInformation",
"FileCompressionInformation",
"FileObjectIdInformation",
"FileCompletionInformation",
"FileMoveClusterInformation",
"FileQuotaInformation",
"FileReparsePointInformation",
"FileNetworkOpenInformation",
"FileAttributeTagInformation",
"FileTrackingInformation",
"FileIdBothDirectoryInformation",
"FileIdFullDirectoryInformation",
"FileValidDataLengthInformation",
"FileShortNameInformation",
"FileIoCompletionNotificationInformation",
"FileIoStatusBlockRangeInformation",
"FileIoPriorityHintInformation",
"FileSfioReserveInformation",
"FileSfioVolumeInformation",
"FileHardLinkInformation",
"FileProcessIdsUsingFileInformation",
"FileNormalizedNameInformation",
"FileNetworkPhysicalNameInformation",
"FileIdGlobalTxDirectoryInformation",
"FileIsRemoteDeviceInformation",
"FileAttributeCacheInformation",
"FileNumaNodeInformation",
"FileStandardLinkInformation",
"FileRemoteProtocolInformation",
"FileReplaceCompletionInformation",
"FileMaximumInformation",
"FileDirectoryInformation",
"FileFullDirectoryInformation",
"FileBothDirectoryInformation",
"FileBasicInformation",
"FileStandardInformation",
"FileInternalInformation",
"FileEaInformation",
"FileAccessInformation",
"FileNameInformation",
"FileRenameInformation",
"FileLinkInformation",
"FileNamesInformation",
"FileDispositionInformation",
"FilePositionInformation",
"FileFullEaInformation",
"FileModeInformation",
"FileAlignmentInformation",
"FileAllInformation",
"FileAllocationInformation",
"FileEndOfFileInformation",
"FileAlternateNameInformation",
"FileStreamInformation",
"FilePipeInformation",
"FilePipeLocalInformation",
"FilePipeRemoteInformation",
"FileMailslotQueryInformation",
"FileMailslotSetInformation",
"FileCompressionInformation",
"FileObjectIdInformation",
"FileCompletionInformation",
"FileMoveClusterInformation",
"FileQuotaInformation",
"FileReparsePointInformation",
"FileNetworkOpenInformation",
"FileAttributeTagInformation",
"FileTrackingInformation",
"FileIdBothDirectoryInformation",
"FileIdFullDirectoryInformation",
"FileValidDataLengthInformation",
"FileShortNameInformation",
"FileIoCompletionNotificationInformation",
"FileIoStatusBlockRangeInformation",
"FileIoPriorityHintInformation",
"FileSfioReserveInformation",
"FileSfioVolumeInformation",
"FileHardLinkInformation",
"FileProcessIdsUsingFileInformation",
"FileNormalizedNameInformation",
"FileNetworkPhysicalNameInformation",
"FileIdGlobalTxDirectoryInformation",
"FileIsRemoteDeviceInformation",
"FileAttributeCacheInformation",
"FileNumaNodeInformation",
"FileStandardLinkInformation",
"FileRemoteProtocolInformation",
"FileReplaceCompletionInformation",
"FileMaximumInformation" };
return fileInfoClassNames[infoClass];
}
/*
* FUNCTION: Retrieve the specified file information
*/
NTSTATUS
NtfsQueryInformation(PNTFS_IRP_CONTEXT IrpContext)
{
FILE_INFORMATION_CLASS FileInformationClass;
PIO_STACK_LOCATION Stack;
PFILE_OBJECT FileObject;
PNTFS_FCB Fcb;
PVOID SystemBuffer;
ULONG BufferLength;
PIRP Irp;
PDEVICE_OBJECT DeviceObject;
NTSTATUS Status = STATUS_SUCCESS;
DPRINT1("NtfsQueryInformation(%p)\n", IrpContext);
Irp = IrpContext->Irp;
Stack = IrpContext->Stack;
DeviceObject = IrpContext->DeviceObject;
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)
{
case FileStandardInformation:
Status = NtfsGetStandardInformation(Fcb,
DeviceObject,
SystemBuffer,
&BufferLength);
break;
case FilePositionInformation:
Status = NtfsGetPositionInformation(FileObject,
SystemBuffer,
&BufferLength);
break;
case FileBasicInformation:
Status = NtfsGetBasicInformation(FileObject,
Fcb,
DeviceObject,
SystemBuffer,
&BufferLength);
break;
case FileNameInformation:
Status = NtfsGetNameInformation(FileObject,
Fcb,
DeviceObject,
SystemBuffer,
&BufferLength);
break;
case FileInternalInformation:
Status = NtfsGetInternalInformation(Fcb,
SystemBuffer,
&BufferLength);
break;
case FileNetworkOpenInformation:
Status = NtfsGetNetworkOpenInformation(Fcb,
DeviceObject->DeviceExtension,
SystemBuffer,
&BufferLength);
break;
case FileStreamInformation:
Status = NtfsGetSteamInformation(Fcb,
DeviceObject->DeviceExtension,
SystemBuffer,
&BufferLength);
break;
case FileAlternateNameInformation:
case FileAllInformation:
DPRINT1("Unimplemented information class: %s\n", GetInfoClassName(FileInformationClass));
Status = STATUS_NOT_IMPLEMENTED;
break;
default:
DPRINT1("Unimplemented information class: %s\n", GetInfoClassName(FileInformationClass));
Status = STATUS_INVALID_PARAMETER;
}
ExReleaseResourceLite(&Fcb->MainResource);
if (NT_SUCCESS(Status))
Irp->IoStatus.Information =
Stack->Parameters.QueryFile.Length - BufferLength;
else
Irp->IoStatus.Information = 0;
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 = ExAllocateFromNPagedLookasideList(&DeviceExt->FileRecLookasideList);
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);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
return Status;
}
DPRINT("Found record for %wS\n", Fcb->ObjectName);
CurrentFileSize.QuadPart = NtfsGetFileSize(DeviceExt, FileRecord, L"", 0, NULL);
// 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");
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
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);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
return Status;
}
// Get the size of the data attribute
CurrentFileSize.QuadPart = AttributeDataLength(DataContext->pRecord);
// 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);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
return STATUS_ACCESS_DENIED;
}
}
// set the attribute data length
Status = SetAttributeDataLength(FileObject, Fcb, DataContext, AttributeOffset, FileRecord, NewFileSize);
if (!NT_SUCCESS(Status))
{
ReleaseAttributeContext(DataContext);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
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");
ReleaseAttributeContext(DataContext);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
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 = AttributeAllocatedLength(DataContext->pRecord);
Status = UpdateFileNameRecord(Fcb->Vcb,
ParentMFTId,
&FileName,
FALSE,
NewFileSize->QuadPart,
AllocationSize,
CaseSensitive);
ReleaseAttributeContext(DataContext);
ExFreeToNPagedLookasideList(&DeviceExt->FileRecLookasideList, FileRecord);
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,
BooleanFlagOn(Stack->Flags, SL_CASE_SENSITIVE),
&EndOfFileInfo->EndOfFile);
break;
// TODO: all other information classes
default:
DPRINT1("FIXME: Unimplemented information class: %s\n", GetInfoClassName(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 */
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