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reactos/drivers/filesystems/ntfs/attrib.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) 2002,2003 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/attrib.c
* PURPOSE: NTFS filesystem driver
* PROGRAMMERS: Eric Kohl
* Valentin Verkhovsky
* Hervé Poussineau (hpoussin@reactos.org)
* Pierre Schweitzer (pierre@reactos.org)
*/
/* INCLUDES *****************************************************************/
#include "ntfs.h"
#include <ntintsafe.h>
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ****************************************************************/
/**
* @name AddBitmap
* @implemented
*
* Adds a $BITMAP attribute to a given FileRecord.
*
* @param Vcb
* Pointer to an NTFS_VCB for the destination volume.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $INDEX_ALLOCATION attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @param Name
* Pointer to a string of 16-bit Unicode characters naming the attribute. Most often L"$I30".
*
* @param NameLength
* The number of wide-characters in the name. L"$I30" Would use 4 here.
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record, or if the file record isn't large enough for the attribute.
*
* @remarks
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* This could be improved by adding an $ATTRIBUTE_LIST to the file record if there's not enough space.
*
*/
NTSTATUS
AddBitmap(PNTFS_VCB Vcb,
PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress,
PCWSTR Name,
USHORT NameLength)
{
ULONG AttributeLength;
// Calculate the header length
ULONG ResidentHeaderLength = FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.Reserved) + sizeof(UCHAR);
ULONG FileRecordEnd = AttributeAddress->Length;
ULONG NameOffset;
ULONG ValueOffset;
// We'll start out with 8 bytes of bitmap data
ULONG ValueLength = 8;
ULONG BytesAvailable;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $BITMAP attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
NameOffset = ResidentHeaderLength;
// Calculate ValueOffset, which will be aligned to a 4-byte boundary
ValueOffset = ALIGN_UP_BY(NameOffset + (sizeof(WCHAR) * NameLength), VALUE_OFFSET_ALIGNMENT);
// Calculate length of attribute
AttributeLength = ValueOffset + ValueLength;
AttributeLength = ALIGN_UP_BY(AttributeLength, ATTR_RECORD_ALIGNMENT);
// Make sure the file record is large enough for the new attribute
BytesAvailable = Vcb->NtfsInfo.BytesPerFileRecord - FileRecord->BytesInUse;
if (BytesAvailable < AttributeLength)
{
DPRINT1("FIXME: Not enough room in file record for index allocation attribute!\n");
return STATUS_NOT_IMPLEMENTED;
}
// Set Attribute fields
RtlZeroMemory(AttributeAddress, AttributeLength);
AttributeAddress->Type = AttributeBitmap;
AttributeAddress->Length = AttributeLength;
AttributeAddress->NameLength = NameLength;
AttributeAddress->NameOffset = NameOffset;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
AttributeAddress->Resident.ValueLength = ValueLength;
AttributeAddress->Resident.ValueOffset = ValueOffset;
// Set the name
RtlCopyMemory((PCHAR)((ULONG_PTR)AttributeAddress + NameOffset), Name, NameLength * sizeof(WCHAR));
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return STATUS_SUCCESS;
}
/**
* @name AddData
* @implemented
*
* Adds a $DATA attribute to a given FileRecord.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to. Caller is responsible for
* ensuring FileRecord is large enough to contain $DATA.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $DATA attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record.
*
* @remarks
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* As it's implemented, this function is only intended to assist in creating new file records. It
* could be made more general-purpose by considering file records with an $ATTRIBUTE_LIST.
* It's the caller's responsibility to ensure the given file record has enough memory allocated
* for the attribute.
*/
NTSTATUS
AddData(PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress)
{
ULONG ResidentHeaderLength = FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.Reserved) + sizeof(UCHAR);
ULONG FileRecordEnd = AttributeAddress->Length;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $DATA attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
AttributeAddress->Type = AttributeData;
AttributeAddress->Length = ResidentHeaderLength;
AttributeAddress->Length = ALIGN_UP_BY(AttributeAddress->Length, ATTR_RECORD_ALIGNMENT);
AttributeAddress->Resident.ValueLength = 0;
AttributeAddress->Resident.ValueOffset = ResidentHeaderLength;
// for unnamed $DATA attributes, NameOffset equals header length
AttributeAddress->NameOffset = ResidentHeaderLength;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return STATUS_SUCCESS;
}
/**
* @name AddFileName
* @implemented
*
* Adds a $FILE_NAME attribute to a given FileRecord.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to. Caller is responsible for
* ensuring FileRecord is large enough to contain $FILE_NAME.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $FILE_NAME attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @param DeviceExt
* Points to the target disk's DEVICE_EXTENSION.
*
* @param FileObject
* Pointer to the FILE_OBJECT which represents the new name.
* This parameter is used to determine the filename and parent directory.
*
* @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 ParentMftIndex
* Pointer to a ULONGLONG which will receive the index of the parent directory.
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record.
*
* @remarks
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* As it's implemented, this function is only intended to assist in creating new file records. It
* could be made more general-purpose by considering file records with an $ATTRIBUTE_LIST.
* It's the caller's responsibility to ensure the given file record has enough memory allocated
* for the attribute.
*/
NTSTATUS
AddFileName(PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress,
PDEVICE_EXTENSION DeviceExt,
PFILE_OBJECT FileObject,
BOOLEAN CaseSensitive,
PULONGLONG ParentMftIndex)
{
ULONG ResidentHeaderLength = FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.Reserved) + sizeof(UCHAR);
PFILENAME_ATTRIBUTE FileNameAttribute;
LARGE_INTEGER SystemTime;
ULONG FileRecordEnd = AttributeAddress->Length;
ULONGLONG CurrentMFTIndex = NTFS_FILE_ROOT;
UNICODE_STRING Current, Remaining, FilenameNoPath;
NTSTATUS Status = STATUS_SUCCESS;
ULONG FirstEntry;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $FILE_NAME attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
AttributeAddress->Type = AttributeFileName;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
FileNameAttribute = (PFILENAME_ATTRIBUTE)((LONG_PTR)AttributeAddress + ResidentHeaderLength);
// set timestamps
KeQuerySystemTime(&SystemTime);
FileNameAttribute->CreationTime = SystemTime.QuadPart;
FileNameAttribute->ChangeTime = SystemTime.QuadPart;
FileNameAttribute->LastWriteTime = SystemTime.QuadPart;
FileNameAttribute->LastAccessTime = SystemTime.QuadPart;
// Is this a directory?
if(FileRecord->Flags & FRH_DIRECTORY)
FileNameAttribute->FileAttributes = NTFS_FILE_TYPE_DIRECTORY;
else
FileNameAttribute->FileAttributes = NTFS_FILE_TYPE_ARCHIVE;
// we need to extract the filename from the path
DPRINT1("Pathname: %wZ\n", &FileObject->FileName);
FsRtlDissectName(FileObject->FileName, &Current, &Remaining);
FilenameNoPath.Buffer = Current.Buffer;
FilenameNoPath.MaximumLength = FilenameNoPath.Length = Current.Length;
while (Current.Length != 0)
{
DPRINT1("Current: %wZ\n", &Current);
if (Remaining.Length != 0)
{
FilenameNoPath.Buffer = Remaining.Buffer;
FilenameNoPath.Length = FilenameNoPath.MaximumLength = Remaining.Length;
}
FirstEntry = 0;
Status = NtfsFindMftRecord(DeviceExt,
CurrentMFTIndex,
&Current,
&FirstEntry,
FALSE,
CaseSensitive,
&CurrentMFTIndex);
if (!NT_SUCCESS(Status))
break;
if (Remaining.Length == 0 )
{
if (Current.Length != 0)
{
FilenameNoPath.Buffer = Current.Buffer;
FilenameNoPath.Length = FilenameNoPath.MaximumLength = Current.Length;
}
break;
}
FsRtlDissectName(Remaining, &Current, &Remaining);
}
DPRINT1("MFT Index of parent: %I64u\n", CurrentMFTIndex);
// set reference to parent directory
FileNameAttribute->DirectoryFileReferenceNumber = CurrentMFTIndex;
*ParentMftIndex = CurrentMFTIndex;
DPRINT1("SequenceNumber: 0x%02x\n", FileRecord->SequenceNumber);
// The highest 2 bytes should be the sequence number, unless the parent happens to be root
if (CurrentMFTIndex == NTFS_FILE_ROOT)
FileNameAttribute->DirectoryFileReferenceNumber |= (ULONGLONG)NTFS_FILE_ROOT << 48;
else
FileNameAttribute->DirectoryFileReferenceNumber |= (ULONGLONG)FileRecord->SequenceNumber << 48;
DPRINT1("FileNameAttribute->DirectoryFileReferenceNumber: 0x%016I64x\n", FileNameAttribute->DirectoryFileReferenceNumber);
FileNameAttribute->NameLength = FilenameNoPath.Length / sizeof(WCHAR);
RtlCopyMemory(FileNameAttribute->Name, FilenameNoPath.Buffer, FilenameNoPath.Length);
// For now, we're emulating the way Windows behaves when 8.3 name generation is disabled
// TODO: add DOS Filename as needed
if (!CaseSensitive && RtlIsNameLegalDOS8Dot3(&FilenameNoPath, NULL, NULL))
FileNameAttribute->NameType = NTFS_FILE_NAME_WIN32_AND_DOS;
else
FileNameAttribute->NameType = NTFS_FILE_NAME_POSIX;
FileRecord->LinkCount++;
AttributeAddress->Length = ResidentHeaderLength +
FIELD_OFFSET(FILENAME_ATTRIBUTE, Name) + FilenameNoPath.Length;
AttributeAddress->Length = ALIGN_UP_BY(AttributeAddress->Length, ATTR_RECORD_ALIGNMENT);
AttributeAddress->Resident.ValueLength = FIELD_OFFSET(FILENAME_ATTRIBUTE, Name) + FilenameNoPath.Length;
AttributeAddress->Resident.ValueOffset = ResidentHeaderLength;
AttributeAddress->Resident.Flags = RA_INDEXED;
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return Status;
}
/**
* @name AddIndexAllocation
* @implemented
*
* Adds an $INDEX_ALLOCATION attribute to a given FileRecord.
*
* @param Vcb
* Pointer to an NTFS_VCB for the destination volume.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $INDEX_ALLOCATION attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @param Name
* Pointer to a string of 16-bit Unicode characters naming the attribute. Most often, this will be L"$I30".
*
* @param NameLength
* The number of wide-characters in the name. L"$I30" Would use 4 here.
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record, or if the file record isn't large enough for the attribute.
*
* @remarks
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* This could be improved by adding an $ATTRIBUTE_LIST to the file record if there's not enough space.
*
*/
NTSTATUS
AddIndexAllocation(PNTFS_VCB Vcb,
PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress,
PCWSTR Name,
USHORT NameLength)
{
ULONG RecordLength;
ULONG FileRecordEnd;
ULONG NameOffset;
ULONG DataRunOffset;
ULONG BytesAvailable;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $INDEX_ALLOCATION attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
// Calculate the name offset
NameOffset = FIELD_OFFSET(NTFS_ATTR_RECORD, NonResident.CompressedSize);
// Calculate the offset to the first data run
DataRunOffset = (sizeof(WCHAR) * NameLength) + NameOffset;
// The data run offset must be aligned to a 4-byte boundary
DataRunOffset = ALIGN_UP_BY(DataRunOffset, DATA_RUN_ALIGNMENT);
// Calculate the length of the new attribute; the empty data run will consist of a single byte
RecordLength = DataRunOffset + 1;
// The size of the attribute itself must be aligned to an 8 - byte boundary
RecordLength = ALIGN_UP_BY(RecordLength, ATTR_RECORD_ALIGNMENT);
// Back up the last 4-bytes of the file record (even though this value doesn't matter)
FileRecordEnd = AttributeAddress->Length;
// Make sure the file record can contain the new attribute
BytesAvailable = Vcb->NtfsInfo.BytesPerFileRecord - FileRecord->BytesInUse;
if (BytesAvailable < RecordLength)
{
DPRINT1("FIXME: Not enough room in file record for index allocation attribute!\n");
return STATUS_NOT_IMPLEMENTED;
}
// Set fields of attribute header
RtlZeroMemory(AttributeAddress, RecordLength);
AttributeAddress->Type = AttributeIndexAllocation;
AttributeAddress->Length = RecordLength;
AttributeAddress->IsNonResident = TRUE;
AttributeAddress->NameLength = NameLength;
AttributeAddress->NameOffset = NameOffset;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
AttributeAddress->NonResident.MappingPairsOffset = DataRunOffset;
AttributeAddress->NonResident.HighestVCN = (LONGLONG)-1;
// Set the name
RtlCopyMemory((PCHAR)((ULONG_PTR)AttributeAddress + NameOffset), Name, NameLength * sizeof(WCHAR));
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return STATUS_SUCCESS;
}
/**
* @name AddIndexRoot
* @implemented
*
* Adds an $INDEX_ROOT attribute to a given FileRecord.
*
* @param Vcb
* Pointer to an NTFS_VCB for the destination volume.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to. Caller is responsible for
* ensuring FileRecord is large enough to contain $INDEX_ROOT.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $INDEX_ROOT attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @param NewIndexRoot
* Pointer to an INDEX_ROOT_ATTRIBUTE containing the index root that will be copied to the new attribute.
*
* @param RootLength
* The length of NewIndexRoot, in bytes.
*
* @param Name
* Pointer to a string of 16-bit Unicode characters naming the attribute. Most often, this will be L"$I30".
*
* @param NameLength
* The number of wide-characters in the name. L"$I30" Would use 4 here.
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record.
*
* @remarks
* This function is intended to assist in creating new folders.
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* It's the caller's responsibility to ensure the given file record has enough memory allocated
* for the attribute, and this memory must have been zeroed.
*/
NTSTATUS
AddIndexRoot(PNTFS_VCB Vcb,
PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress,
PINDEX_ROOT_ATTRIBUTE NewIndexRoot,
ULONG RootLength,
PCWSTR Name,
USHORT NameLength)
{
ULONG AttributeLength;
// Calculate the header length
ULONG ResidentHeaderLength = FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.Reserved) + sizeof(UCHAR);
// Back up the file record's final ULONG (even though it doesn't matter)
ULONG FileRecordEnd = AttributeAddress->Length;
ULONG NameOffset;
ULONG ValueOffset;
ULONG BytesAvailable;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $DATA attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
NameOffset = ResidentHeaderLength;
// Calculate ValueOffset, which will be aligned to a 4-byte boundary
ValueOffset = ALIGN_UP_BY(NameOffset + (sizeof(WCHAR) * NameLength), VALUE_OFFSET_ALIGNMENT);
// Calculate length of attribute
AttributeLength = ValueOffset + RootLength;
AttributeLength = ALIGN_UP_BY(AttributeLength, ATTR_RECORD_ALIGNMENT);
// Make sure the file record is large enough for the new attribute
BytesAvailable = Vcb->NtfsInfo.BytesPerFileRecord - FileRecord->BytesInUse;
if (BytesAvailable < AttributeLength)
{
DPRINT1("FIXME: Not enough room in file record for index allocation attribute!\n");
return STATUS_NOT_IMPLEMENTED;
}
// Set Attribute fields
RtlZeroMemory(AttributeAddress, AttributeLength);
AttributeAddress->Type = AttributeIndexRoot;
AttributeAddress->Length = AttributeLength;
AttributeAddress->NameLength = NameLength;
AttributeAddress->NameOffset = NameOffset;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
AttributeAddress->Resident.ValueLength = RootLength;
AttributeAddress->Resident.ValueOffset = ValueOffset;
// Set the name
RtlCopyMemory((PCHAR)((ULONG_PTR)AttributeAddress + NameOffset), Name, NameLength * sizeof(WCHAR));
// Copy the index root attribute
RtlCopyMemory((PCHAR)((ULONG_PTR)AttributeAddress + ValueOffset), NewIndexRoot, RootLength);
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return STATUS_SUCCESS;
}
/**
* @name AddRun
* @implemented
*
* Adds a run of allocated clusters to a non-resident attribute.
*
* @param Vcb
* Pointer to an NTFS_VCB for the destination volume.
*
* @param AttrContext
* Pointer to an NTFS_ATTR_CONTEXT describing the destination attribute.
*
* @param AttrOffset
* Byte offset of the destination attribute relative to its file record.
*
* @param FileRecord
* Pointer to a complete copy of the file record containing the destination attribute. Must be at least
* Vcb->NtfsInfo.BytesPerFileRecord bytes long.
*
* @param NextAssignedCluster
* Logical cluster number of the start of the data run being added.
*
* @param RunLength
* How many clusters are in the data run being added. Can't be 0.
*
* @return
* STATUS_SUCCESS on success. STATUS_INVALID_PARAMETER if AttrContext describes a resident attribute.
* STATUS_INSUFFICIENT_RESOURCES if ConvertDataRunsToLargeMCB() fails or if we fail to allocate a
* buffer for the new data runs.
* STATUS_INSUFFICIENT_RESOURCES or STATUS_UNSUCCESSFUL if FsRtlAddLargeMcbEntry() fails.
* STATUS_BUFFER_TOO_SMALL if ConvertLargeMCBToDataRuns() fails.
* STATUS_NOT_IMPLEMENTED if we need to migrate the attribute to an attribute list (TODO).
*
* @remarks
* Clusters should have been allocated previously with NtfsAllocateClusters().
*
*
*/
NTSTATUS
AddRun(PNTFS_VCB Vcb,
PNTFS_ATTR_CONTEXT AttrContext,
ULONG AttrOffset,
PFILE_RECORD_HEADER FileRecord,
ULONGLONG NextAssignedCluster,
ULONG RunLength)
{
NTSTATUS Status;
int DataRunMaxLength;
PNTFS_ATTR_RECORD DestinationAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
ULONG NextAttributeOffset = AttrOffset + AttrContext->pRecord->Length;
ULONGLONG NextVBN = 0;
PUCHAR RunBuffer;
ULONG RunBufferSize;
if (!AttrContext->pRecord->IsNonResident)
return STATUS_INVALID_PARAMETER;
if (AttrContext->pRecord->NonResident.AllocatedSize != 0)
NextVBN = AttrContext->pRecord->NonResident.HighestVCN + 1;
// Add newly-assigned clusters to mcb
_SEH2_TRY
{
if (!FsRtlAddLargeMcbEntry(&AttrContext->DataRunsMCB,
NextVBN,
NextAssignedCluster,
RunLength))
{
ExRaiseStatus(STATUS_UNSUCCESSFUL);
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
DPRINT1("Failed to add LargeMcb Entry!\n");
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
RunBuffer = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (!RunBuffer)
{
DPRINT1("ERROR: Couldn't allocate memory for data runs!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Convert the map control block back to encoded data runs
ConvertLargeMCBToDataRuns(&AttrContext->DataRunsMCB, RunBuffer, Vcb->NtfsInfo.BytesPerCluster, &RunBufferSize);
// Get the amount of free space between the start of the of the first data run and the attribute end
DataRunMaxLength = AttrContext->pRecord->Length - AttrContext->pRecord->NonResident.MappingPairsOffset;
// Do we need to extend the attribute (or convert to attribute list)?
if (DataRunMaxLength < RunBufferSize)
{
PNTFS_ATTR_RECORD NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + NextAttributeOffset);
PNTFS_ATTR_RECORD NewRecord;
// Add free space at the end of the file record to DataRunMaxLength
DataRunMaxLength += Vcb->NtfsInfo.BytesPerFileRecord - FileRecord->BytesInUse;
// Can we resize the attribute?
if (DataRunMaxLength < RunBufferSize)
{
DPRINT1("FIXME: Need to create attribute list! Max Data Run Length available: %d, RunBufferSize: %d\n", DataRunMaxLength, RunBufferSize);
ExFreePoolWithTag(RunBuffer, TAG_NTFS);
return STATUS_NOT_IMPLEMENTED;
}
// Are there more attributes after the one we're resizing?
if (NextAttribute->Type != AttributeEnd)
{
PNTFS_ATTR_RECORD FinalAttribute;
// Calculate where to move the trailing attributes
ULONG_PTR MoveTo = (ULONG_PTR)DestinationAttribute + AttrContext->pRecord->NonResident.MappingPairsOffset + RunBufferSize;
MoveTo = ALIGN_UP_BY(MoveTo, ATTR_RECORD_ALIGNMENT);
DPRINT1("Moving attribute(s) after this one starting with type 0x%lx\n", NextAttribute->Type);
// Move the trailing attributes; FinalAttribute will point to the end marker
FinalAttribute = MoveAttributes(Vcb, NextAttribute, NextAttributeOffset, MoveTo);
// set the file record end
SetFileRecordEnd(FileRecord, FinalAttribute, FILE_RECORD_END);
}
// calculate position of end markers
NextAttributeOffset = AttrOffset + AttrContext->pRecord->NonResident.MappingPairsOffset + RunBufferSize;
NextAttributeOffset = ALIGN_UP_BY(NextAttributeOffset, ATTR_RECORD_ALIGNMENT);
// Update the length of the destination attribute
DestinationAttribute->Length = NextAttributeOffset - AttrOffset;
// Create a new copy of the attribute record
NewRecord = ExAllocatePoolWithTag(NonPagedPool, DestinationAttribute->Length, TAG_NTFS);
RtlCopyMemory(NewRecord, AttrContext->pRecord, AttrContext->pRecord->Length);
NewRecord->Length = DestinationAttribute->Length;
// Free the old copy of the attribute record, which won't be large enough
ExFreePoolWithTag(AttrContext->pRecord, TAG_NTFS);
// Set the attribute context's record to the new copy
AttrContext->pRecord = NewRecord;
// if NextAttribute is the AttributeEnd marker
if (NextAttribute->Type == AttributeEnd)
{
// End the file record
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + NextAttributeOffset);
SetFileRecordEnd(FileRecord, NextAttribute, FILE_RECORD_END);
}
}
// Update HighestVCN
DestinationAttribute->NonResident.HighestVCN =
AttrContext->pRecord->NonResident.HighestVCN = max(NextVBN - 1 + RunLength,
AttrContext->pRecord->NonResident.HighestVCN);
// Write data runs to destination attribute
RtlCopyMemory((PVOID)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset),
RunBuffer,
RunBufferSize);
// Update the attribute record in the attribute context
RtlCopyMemory((PVOID)((ULONG_PTR)AttrContext->pRecord + AttrContext->pRecord->NonResident.MappingPairsOffset),
RunBuffer,
RunBufferSize);
// Update the file record
Status = UpdateFileRecord(Vcb, AttrContext->FileMFTIndex, FileRecord);
ExFreePoolWithTag(RunBuffer, TAG_NTFS);
NtfsDumpDataRuns((PUCHAR)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset), 0);
return Status;
}
/**
* @name AddStandardInformation
* @implemented
*
* Adds a $STANDARD_INFORMATION attribute to a given FileRecord.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to. Caller is responsible for
* ensuring FileRecord is large enough to contain $STANDARD_INFORMATION.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $STANDARD_INFORMATION attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record.
*
* @remarks
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* As it's implemented, this function is only intended to assist in creating new file records. It
* could be made more general-purpose by considering file records with an $ATTRIBUTE_LIST.
* It's the caller's responsibility to ensure the given file record has enough memory allocated
* for the attribute.
*/
NTSTATUS
AddStandardInformation(PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress)
{
ULONG ResidentHeaderLength = FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.Reserved) + sizeof(UCHAR);
PSTANDARD_INFORMATION StandardInfo = (PSTANDARD_INFORMATION)((LONG_PTR)AttributeAddress + ResidentHeaderLength);
LARGE_INTEGER SystemTime;
ULONG FileRecordEnd = AttributeAddress->Length;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $STANDARD_INFORMATION attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
AttributeAddress->Type = AttributeStandardInformation;
AttributeAddress->Length = sizeof(STANDARD_INFORMATION) + ResidentHeaderLength;
AttributeAddress->Length = ALIGN_UP_BY(AttributeAddress->Length, ATTR_RECORD_ALIGNMENT);
AttributeAddress->Resident.ValueLength = sizeof(STANDARD_INFORMATION);
AttributeAddress->Resident.ValueOffset = ResidentHeaderLength;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
// set dates and times
KeQuerySystemTime(&SystemTime);
StandardInfo->CreationTime = SystemTime.QuadPart;
StandardInfo->ChangeTime = SystemTime.QuadPart;
StandardInfo->LastWriteTime = SystemTime.QuadPart;
StandardInfo->LastAccessTime = SystemTime.QuadPart;
StandardInfo->FileAttribute = NTFS_FILE_TYPE_ARCHIVE;
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return STATUS_SUCCESS;
}
/**
* @name ConvertDataRunsToLargeMCB
* @implemented
*
* Converts binary data runs to a map control block.
*
* @param DataRun
* Pointer to the run data
*
* @param DataRunsMCB
* Pointer to an unitialized LARGE_MCB structure.
*
* @return
* STATUS_SUCCESS on success, STATUS_INSUFFICIENT_RESOURCES or STATUS_UNSUCCESSFUL if we fail to
* initialize the mcb or add an entry.
*
* @remarks
* Initializes the LARGE_MCB pointed to by DataRunsMCB. If this function succeeds, you
* need to call FsRtlUninitializeLargeMcb() when you're done with DataRunsMCB. This
* function will ensure the LargeMCB has been unitialized in case of failure.
*
*/
NTSTATUS
ConvertDataRunsToLargeMCB(PUCHAR DataRun,
PLARGE_MCB DataRunsMCB,
PULONGLONG pNextVBN)
{
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
LONGLONG DataRunStartLCN;
ULONGLONG LastLCN = 0;
// Initialize the MCB, potentially catch an exception
_SEH2_TRY{
FsRtlInitializeLargeMcb(DataRunsMCB, NonPagedPool);
} _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
_SEH2_YIELD(return _SEH2_GetExceptionCode());
} _SEH2_END;
while (*DataRun != 0)
{
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
{
// Normal data run.
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
_SEH2_TRY{
if (!FsRtlAddLargeMcbEntry(DataRunsMCB,
*pNextVBN,
DataRunStartLCN,
DataRunLength))
{
ExRaiseStatus(STATUS_UNSUCCESSFUL);
}
} _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
FsRtlUninitializeLargeMcb(DataRunsMCB);
_SEH2_YIELD(return _SEH2_GetExceptionCode());
} _SEH2_END;
}
*pNextVBN += DataRunLength;
}
return STATUS_SUCCESS;
}
/**
* @name ConvertLargeMCBToDataRuns
* @implemented
*
* Converts a map control block to a series of encoded data runs (used by non-resident attributes).
*
* @param DataRunsMCB
* Pointer to a LARGE_MCB structure describing the data runs.
*
* @param RunBuffer
* Pointer to the buffer that will receive the encoded data runs.
*
* @param MaxBufferSize
* Size of RunBuffer, in bytes.
*
* @param UsedBufferSize
* Pointer to a ULONG that will receive the size of the data runs in bytes. Can't be NULL.
*
* @return
* STATUS_SUCCESS on success, STATUS_BUFFER_TOO_SMALL if RunBuffer is too small to contain the
* complete output.
*
*/
NTSTATUS
ConvertLargeMCBToDataRuns(PLARGE_MCB DataRunsMCB,
PUCHAR RunBuffer,
ULONG MaxBufferSize,
PULONG UsedBufferSize)
{
NTSTATUS Status = STATUS_SUCCESS;
ULONG RunBufferOffset = 0;
LONGLONG DataRunOffset;
ULONGLONG LastLCN = 0;
LONGLONG Vbn, Lbn, Count;
ULONG i;
DPRINT("\t[Vbn, Lbn, Count]\n");
// convert each mcb entry to a data run
for (i = 0; FsRtlGetNextLargeMcbEntry(DataRunsMCB, i, &Vbn, &Lbn, &Count); i++)
{
UCHAR DataRunOffsetSize = 0;
UCHAR DataRunLengthSize = 0;
UCHAR ControlByte = 0;
// [vbn, lbn, count]
DPRINT("\t[%I64d, %I64d,%I64d]\n", Vbn, Lbn, Count);
// TODO: check for holes and convert to sparse runs
DataRunOffset = Lbn - LastLCN;
LastLCN = Lbn;
// now we need to determine how to represent DataRunOffset with the minimum number of bytes
DPRINT("Determining how many bytes needed to represent %I64x\n", DataRunOffset);
DataRunOffsetSize = GetPackedByteCount(DataRunOffset, TRUE);
DPRINT("%d bytes needed.\n", DataRunOffsetSize);
// determine how to represent DataRunLengthSize with the minimum number of bytes
DPRINT("Determining how many bytes needed to represent %I64x\n", Count);
DataRunLengthSize = GetPackedByteCount(Count, TRUE);
DPRINT("%d bytes needed.\n", DataRunLengthSize);
// ensure the next data run + end marker would be <= Max buffer size
if (RunBufferOffset + 2 + DataRunLengthSize + DataRunOffsetSize > MaxBufferSize)
{
Status = STATUS_BUFFER_TOO_SMALL;
DPRINT1("FIXME: Ran out of room in buffer for data runs!\n");
break;
}
// pack and copy the control byte
ControlByte = (DataRunOffsetSize << 4) + DataRunLengthSize;
RunBuffer[RunBufferOffset++] = ControlByte;
// copy DataRunLength
RtlCopyMemory(RunBuffer + RunBufferOffset, &Count, DataRunLengthSize);
RunBufferOffset += DataRunLengthSize;
// copy DataRunOffset
RtlCopyMemory(RunBuffer + RunBufferOffset, &DataRunOffset, DataRunOffsetSize);
RunBufferOffset += DataRunOffsetSize;
}
// End of data runs
RunBuffer[RunBufferOffset++] = 0;
*UsedBufferSize = RunBufferOffset;
DPRINT("New Size of DataRuns: %ld\n", *UsedBufferSize);
return Status;
}
PUCHAR
DecodeRun(PUCHAR DataRun,
LONGLONG *DataRunOffset,
ULONGLONG *DataRunLength)
{
UCHAR DataRunOffsetSize;
UCHAR DataRunLengthSize;
CHAR i;
DataRunOffsetSize = (*DataRun >> 4) & 0xF;
DataRunLengthSize = *DataRun & 0xF;
*DataRunOffset = 0;
*DataRunLength = 0;
DataRun++;
for (i = 0; i < DataRunLengthSize; i++)
{
*DataRunLength += ((ULONG64)*DataRun) << (i * 8);
DataRun++;
}
/* NTFS 3+ sparse files */
if (DataRunOffsetSize == 0)
{
*DataRunOffset = -1;
}
else
{
for (i = 0; i < DataRunOffsetSize - 1; i++)
{
*DataRunOffset += ((ULONG64)*DataRun) << (i * 8);
DataRun++;
}
/* The last byte contains sign so we must process it different way. */
*DataRunOffset = ((LONG64)(CHAR)(*(DataRun++)) << (i * 8)) + *DataRunOffset;
}
DPRINT("DataRunOffsetSize: %x\n", DataRunOffsetSize);
DPRINT("DataRunLengthSize: %x\n", DataRunLengthSize);
DPRINT("DataRunOffset: %x\n", *DataRunOffset);
DPRINT("DataRunLength: %x\n", *DataRunLength);
return DataRun;
}
BOOLEAN
FindRun(PNTFS_ATTR_RECORD NresAttr,
ULONGLONG vcn,
PULONGLONG lcn,
PULONGLONG count)
{
if (vcn < NresAttr->NonResident.LowestVCN || vcn > NresAttr->NonResident.HighestVCN)
return FALSE;
DecodeRun((PUCHAR)((ULONG_PTR)NresAttr + NresAttr->NonResident.MappingPairsOffset), (PLONGLONG)lcn, count);
return TRUE;
}
/**
* @name FreeClusters
* @implemented
*
* Shrinks the allocation size of a non-resident attribute by a given number of clusters.
* Frees the clusters from the volume's $BITMAP file as well as the attribute's data runs.
*
* @param Vcb
* Pointer to an NTFS_VCB for the destination volume.
*
* @param AttrContext
* Pointer to an NTFS_ATTR_CONTEXT describing the attribute from which the clusters will be freed.
*
* @param AttrOffset
* Byte offset of the destination attribute relative to its file record.
*
* @param FileRecord
* Pointer to a complete copy of the file record containing the attribute. Must be at least
* Vcb->NtfsInfo.BytesPerFileRecord bytes long.
*
* @param ClustersToFree
* Number of clusters that should be freed from the end of the data stream. Must be no more
* Than the number of clusters assigned to the attribute (HighestVCN + 1).
*
* @return
* STATUS_SUCCESS on success. STATUS_INVALID_PARAMETER if AttrContext describes a resident attribute,
* or if the caller requested more clusters be freed than the attribute has been allocated.
* STATUS_INSUFFICIENT_RESOURCES if allocating a buffer for the data runs fails or
* if ConvertDataRunsToLargeMCB() fails.
* STATUS_BUFFER_TOO_SMALL if ConvertLargeMCBToDataRuns() fails.
*
*
*/
NTSTATUS
FreeClusters(PNTFS_VCB Vcb,
PNTFS_ATTR_CONTEXT AttrContext,
ULONG AttrOffset,
PFILE_RECORD_HEADER FileRecord,
ULONG ClustersToFree)
{
NTSTATUS Status = STATUS_SUCCESS;
ULONG ClustersLeftToFree = ClustersToFree;
PNTFS_ATTR_RECORD DestinationAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
ULONG NextAttributeOffset = AttrOffset + AttrContext->pRecord->Length;
PNTFS_ATTR_RECORD NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + NextAttributeOffset);
PUCHAR RunBuffer;
ULONG RunBufferSize = 0;
PFILE_RECORD_HEADER BitmapRecord;
PNTFS_ATTR_CONTEXT DataContext;
ULONGLONG BitmapDataSize;
PUCHAR BitmapData;
RTL_BITMAP Bitmap;
ULONG LengthWritten;
if (!AttrContext->pRecord->IsNonResident)
{
return STATUS_INVALID_PARAMETER;
}
// Read the $Bitmap file
BitmapRecord = ExAllocateFromNPagedLookasideList(&Vcb->FileRecLookasideList);
if (BitmapRecord == NULL)
{
DPRINT1("Error: Unable to allocate memory for bitmap file record!\n");
return STATUS_NO_MEMORY;
}
Status = ReadFileRecord(Vcb, NTFS_FILE_BITMAP, BitmapRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to read file record for bitmap!\n");
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, BitmapRecord);
return 0;
}
Status = FindAttribute(Vcb, BitmapRecord, AttributeData, L"", 0, &DataContext, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to find data attribute for bitmap file!\n");
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, BitmapRecord);
return 0;
}
BitmapDataSize = AttributeDataLength(DataContext->pRecord);
BitmapDataSize = min(BitmapDataSize, ULONG_MAX);
ASSERT((BitmapDataSize * 8) >= Vcb->NtfsInfo.ClusterCount);
BitmapData = ExAllocatePoolWithTag(NonPagedPool, ROUND_UP(BitmapDataSize, Vcb->NtfsInfo.BytesPerSector), TAG_NTFS);
if (BitmapData == NULL)
{
DPRINT1("Error: Unable to allocate memory for bitmap file data!\n");
ReleaseAttributeContext(DataContext);
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, BitmapRecord);
return 0;
}
ReadAttribute(Vcb, DataContext, 0, (PCHAR)BitmapData, (ULONG)BitmapDataSize);
RtlInitializeBitMap(&Bitmap, (PULONG)BitmapData, Vcb->NtfsInfo.ClusterCount);
// free clusters in $BITMAP file
while (ClustersLeftToFree > 0)
{
LONGLONG LargeVbn, LargeLbn;
if (!FsRtlLookupLastLargeMcbEntry(&AttrContext->DataRunsMCB, &LargeVbn, &LargeLbn))
{
Status = STATUS_INVALID_PARAMETER;
DPRINT1("DRIVER ERROR: FreeClusters called to free %lu clusters, which is %lu more clusters than are assigned to attribute!",
ClustersToFree,
ClustersLeftToFree);
break;
}
if (LargeLbn != -1)
{
// deallocate this cluster
RtlClearBits(&Bitmap, LargeLbn, 1);
}
FsRtlTruncateLargeMcb(&AttrContext->DataRunsMCB, AttrContext->pRecord->NonResident.HighestVCN);
// decrement HighestVCN, but don't let it go below 0
AttrContext->pRecord->NonResident.HighestVCN = min(AttrContext->pRecord->NonResident.HighestVCN, AttrContext->pRecord->NonResident.HighestVCN - 1);
ClustersLeftToFree--;
}
// update $BITMAP file on disk
Status = WriteAttribute(Vcb, DataContext, 0, BitmapData, (ULONG)BitmapDataSize, &LengthWritten, FileRecord);
if (!NT_SUCCESS(Status))
{
ReleaseAttributeContext(DataContext);
ExFreePoolWithTag(BitmapData, TAG_NTFS);
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, BitmapRecord);
return Status;
}
ReleaseAttributeContext(DataContext);
ExFreePoolWithTag(BitmapData, TAG_NTFS);
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, BitmapRecord);
// Save updated data runs to file record
// Allocate some memory for a new RunBuffer
RunBuffer = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (!RunBuffer)
{
DPRINT1("ERROR: Couldn't allocate memory for data runs!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Convert the map control block back to encoded data runs
ConvertLargeMCBToDataRuns(&AttrContext->DataRunsMCB, RunBuffer, Vcb->NtfsInfo.BytesPerCluster, &RunBufferSize);
// Update HighestVCN
DestinationAttribute->NonResident.HighestVCN = AttrContext->pRecord->NonResident.HighestVCN;
// Write data runs to destination attribute
RtlCopyMemory((PVOID)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset),
RunBuffer,
RunBufferSize);
// Is DestinationAttribute the last attribute in the file record?
if (NextAttribute->Type == AttributeEnd)
{
// update attribute length
DestinationAttribute->Length = ALIGN_UP_BY(AttrContext->pRecord->NonResident.MappingPairsOffset + RunBufferSize,
ATTR_RECORD_ALIGNMENT);
ASSERT(DestinationAttribute->Length <= AttrContext->pRecord->Length);
AttrContext->pRecord->Length = DestinationAttribute->Length;
// write end markers
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)DestinationAttribute + DestinationAttribute->Length);
SetFileRecordEnd(FileRecord, NextAttribute, FILE_RECORD_END);
}
// Update the file record
Status = UpdateFileRecord(Vcb, AttrContext->FileMFTIndex, FileRecord);
ExFreePoolWithTag(RunBuffer, TAG_NTFS);
NtfsDumpDataRuns((PUCHAR)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset), 0);
return Status;
}
static
NTSTATUS
InternalReadNonResidentAttributes(PFIND_ATTR_CONTXT Context)
{
ULONGLONG ListSize;
PNTFS_ATTR_RECORD Attribute;
PNTFS_ATTR_CONTEXT ListContext;
DPRINT("InternalReadNonResidentAttributes(%p)\n", Context);
Attribute = Context->CurrAttr;
ASSERT(Attribute->Type == AttributeAttributeList);
if (Context->OnlyResident)
{
Context->NonResidentStart = NULL;
Context->NonResidentEnd = NULL;
return STATUS_SUCCESS;
}
if (Context->NonResidentStart != NULL)
{
return STATUS_FILE_CORRUPT_ERROR;
}
ListContext = PrepareAttributeContext(Attribute);
ListSize = AttributeDataLength(ListContext->pRecord);
if (ListSize > 0xFFFFFFFF)
{
ReleaseAttributeContext(ListContext);
return STATUS_BUFFER_OVERFLOW;
}
Context->NonResidentStart = ExAllocatePoolWithTag(NonPagedPool, (ULONG)ListSize, TAG_NTFS);
if (Context->NonResidentStart == NULL)
{
ReleaseAttributeContext(ListContext);
return STATUS_INSUFFICIENT_RESOURCES;
}
if (ReadAttribute(Context->Vcb, ListContext, 0, (PCHAR)Context->NonResidentStart, (ULONG)ListSize) != ListSize)
{
ExFreePoolWithTag(Context->NonResidentStart, TAG_NTFS);
Context->NonResidentStart = NULL;
ReleaseAttributeContext(ListContext);
return STATUS_FILE_CORRUPT_ERROR;
}
ReleaseAttributeContext(ListContext);
Context->NonResidentEnd = (PNTFS_ATTR_RECORD)((PCHAR)Context->NonResidentStart + ListSize);
return STATUS_SUCCESS;
}
static
PNTFS_ATTR_RECORD
InternalGetNextAttribute(PFIND_ATTR_CONTXT Context)
{
PNTFS_ATTR_RECORD NextAttribute;
if (Context->CurrAttr == (PVOID)-1)
{
return NULL;
}
if (Context->CurrAttr >= Context->FirstAttr &&
Context->CurrAttr < Context->LastAttr)
{
if (Context->CurrAttr->Length == 0)
{
DPRINT1("Broken length!\n");
Context->CurrAttr = (PVOID)-1;
return NULL;
}
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)Context->CurrAttr + Context->CurrAttr->Length);
if (NextAttribute > Context->LastAttr || NextAttribute < Context->FirstAttr)
{
DPRINT1("Broken length: 0x%lx!\n", Context->CurrAttr->Length);
Context->CurrAttr = (PVOID)-1;
return NULL;
}
Context->Offset += ((ULONG_PTR)NextAttribute - (ULONG_PTR)Context->CurrAttr);
Context->CurrAttr = NextAttribute;
if (Context->CurrAttr < Context->LastAttr &&
Context->CurrAttr->Type != AttributeEnd)
{
return Context->CurrAttr;
}
}
if (Context->NonResidentStart == NULL)
{
Context->CurrAttr = (PVOID)-1;
return NULL;
}
if (Context->CurrAttr < Context->NonResidentStart ||
Context->CurrAttr >= Context->NonResidentEnd)
{
Context->CurrAttr = Context->NonResidentStart;
}
else if (Context->CurrAttr->Length != 0)
{
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)Context->CurrAttr + Context->CurrAttr->Length);
Context->Offset += ((ULONG_PTR)NextAttribute - (ULONG_PTR)Context->CurrAttr);
Context->CurrAttr = NextAttribute;
}
else
{
DPRINT1("Broken length!\n");
Context->CurrAttr = (PVOID)-1;
return NULL;
}
if (Context->CurrAttr < Context->NonResidentEnd &&
Context->CurrAttr->Type != AttributeEnd)
{
return Context->CurrAttr;
}
Context->CurrAttr = (PVOID)-1;
return NULL;
}
NTSTATUS
FindFirstAttribute(PFIND_ATTR_CONTXT Context,
PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord,
BOOLEAN OnlyResident,
PNTFS_ATTR_RECORD * Attribute)
{
NTSTATUS Status;
DPRINT("FindFistAttribute(%p, %p, %p, %p, %u, %p)\n", Context, Vcb, FileRecord, OnlyResident, Attribute);
Context->Vcb = Vcb;
Context->OnlyResident = OnlyResident;
Context->FirstAttr = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + FileRecord->AttributeOffset);
Context->CurrAttr = Context->FirstAttr;
Context->LastAttr = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + FileRecord->BytesInUse);
Context->NonResidentStart = NULL;
Context->NonResidentEnd = NULL;
Context->Offset = FileRecord->AttributeOffset;
if (Context->FirstAttr->Type == AttributeEnd)
{
Context->CurrAttr = (PVOID)-1;
return STATUS_END_OF_FILE;
}
else if (Context->FirstAttr->Type == AttributeAttributeList)
{
Status = InternalReadNonResidentAttributes(Context);
if (!NT_SUCCESS(Status))
{
return Status;
}
*Attribute = InternalGetNextAttribute(Context);
if (*Attribute == NULL)
{
return STATUS_END_OF_FILE;
}
}
else
{
*Attribute = Context->CurrAttr;
Context->Offset = (UCHAR*)Context->CurrAttr - (UCHAR*)FileRecord;
}
return STATUS_SUCCESS;
}
NTSTATUS
FindNextAttribute(PFIND_ATTR_CONTXT Context,
PNTFS_ATTR_RECORD * Attribute)
{
NTSTATUS Status;
DPRINT("FindNextAttribute(%p, %p)\n", Context, Attribute);
*Attribute = InternalGetNextAttribute(Context);
if (*Attribute == NULL)
{
return STATUS_END_OF_FILE;
}
if (Context->CurrAttr->Type != AttributeAttributeList)
{
return STATUS_SUCCESS;
}
Status = InternalReadNonResidentAttributes(Context);
if (!NT_SUCCESS(Status))
{
return Status;
}
*Attribute = InternalGetNextAttribute(Context);
if (*Attribute == NULL)
{
return STATUS_END_OF_FILE;
}
return STATUS_SUCCESS;
}
VOID
FindCloseAttribute(PFIND_ATTR_CONTXT Context)
{
if (Context->NonResidentStart != NULL)
{
ExFreePoolWithTag(Context->NonResidentStart, TAG_NTFS);
Context->NonResidentStart = NULL;
}
}
static
VOID
NtfsDumpFileNameAttribute(PNTFS_ATTR_RECORD Attribute)
{
PFILENAME_ATTRIBUTE FileNameAttr;
DbgPrint(" $FILE_NAME ");
// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
FileNameAttr = (PFILENAME_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
DbgPrint(" (%x) '%.*S' ", FileNameAttr->NameType, FileNameAttr->NameLength, FileNameAttr->Name);
DbgPrint(" '%x' \n", FileNameAttr->FileAttributes);
DbgPrint(" AllocatedSize: %I64u\nDataSize: %I64u\n", FileNameAttr->AllocatedSize, FileNameAttr->DataSize);
DbgPrint(" File reference: 0x%016I64x\n", FileNameAttr->DirectoryFileReferenceNumber);
}
static
VOID
NtfsDumpStandardInformationAttribute(PNTFS_ATTR_RECORD Attribute)
{
PSTANDARD_INFORMATION StandardInfoAttr;
DbgPrint(" $STANDARD_INFORMATION ");
// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
StandardInfoAttr = (PSTANDARD_INFORMATION)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
DbgPrint(" '%x' ", StandardInfoAttr->FileAttribute);
}
static
VOID
NtfsDumpVolumeNameAttribute(PNTFS_ATTR_RECORD Attribute)
{
PWCHAR VolumeName;
DbgPrint(" $VOLUME_NAME ");
// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
VolumeName = (PWCHAR)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
DbgPrint(" '%.*S' ", Attribute->Resident.ValueLength / sizeof(WCHAR), VolumeName);
}
static
VOID
NtfsDumpVolumeInformationAttribute(PNTFS_ATTR_RECORD Attribute)
{
PVOLINFO_ATTRIBUTE VolInfoAttr;
DbgPrint(" $VOLUME_INFORMATION ");
// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
VolInfoAttr = (PVOLINFO_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
DbgPrint(" NTFS Version %u.%u Flags 0x%04hx ",
VolInfoAttr->MajorVersion,
VolInfoAttr->MinorVersion,
VolInfoAttr->Flags);
}
static
VOID
NtfsDumpIndexRootAttribute(PNTFS_ATTR_RECORD Attribute)
{
PINDEX_ROOT_ATTRIBUTE IndexRootAttr;
ULONG CurrentOffset;
ULONG CurrentNode;
IndexRootAttr = (PINDEX_ROOT_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
if (IndexRootAttr->AttributeType == AttributeFileName)
ASSERT(IndexRootAttr->CollationRule == COLLATION_FILE_NAME);
DbgPrint(" $INDEX_ROOT (%u bytes per index record, %u clusters) ", IndexRootAttr->SizeOfEntry, IndexRootAttr->ClustersPerIndexRecord);
if (IndexRootAttr->Header.Flags == INDEX_ROOT_SMALL)
{
DbgPrint(" (small)\n");
}
else
{
ASSERT(IndexRootAttr->Header.Flags == INDEX_ROOT_LARGE);
DbgPrint(" (large)\n");
}
DbgPrint(" Offset to first index: 0x%lx\n Total size of index entries: 0x%lx\n Allocated size of node: 0x%lx\n",
IndexRootAttr->Header.FirstEntryOffset,
IndexRootAttr->Header.TotalSizeOfEntries,
IndexRootAttr->Header.AllocatedSize);
CurrentOffset = IndexRootAttr->Header.FirstEntryOffset;
CurrentNode = 0;
// print details of every node in the index
while (CurrentOffset < IndexRootAttr->Header.TotalSizeOfEntries)
{
PINDEX_ENTRY_ATTRIBUTE currentIndexExtry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)IndexRootAttr + 0x10 + CurrentOffset);
DbgPrint(" Index Node Entry %lu", CurrentNode++);
if (BooleanFlagOn(currentIndexExtry->Flags, NTFS_INDEX_ENTRY_NODE))
DbgPrint(" (Branch)");
else
DbgPrint(" (Leaf)");
if (BooleanFlagOn(currentIndexExtry->Flags, NTFS_INDEX_ENTRY_END))
{
DbgPrint(" (Dummy Key)");
}
DbgPrint("\n File Reference: 0x%016I64x\n", currentIndexExtry->Data.Directory.IndexedFile);
DbgPrint(" Index Entry Length: 0x%x\n", currentIndexExtry->Length);
DbgPrint(" Index Key Length: 0x%x\n", currentIndexExtry->KeyLength);
// if this isn't the final (dummy) node, print info about the key (Filename attribute)
if (!(currentIndexExtry->Flags & NTFS_INDEX_ENTRY_END))
{
UNICODE_STRING Name;
DbgPrint(" Parent File Reference: 0x%016I64x\n", currentIndexExtry->FileName.DirectoryFileReferenceNumber);
DbgPrint(" $FILENAME indexed: ");
Name.Length = currentIndexExtry->FileName.NameLength * sizeof(WCHAR);
Name.MaximumLength = Name.Length;
Name.Buffer = currentIndexExtry->FileName.Name;
DbgPrint("'%wZ'\n", &Name);
}
// if this node has a sub-node beneath it
if (currentIndexExtry->Flags & NTFS_INDEX_ENTRY_NODE)
{
// Print the VCN of the sub-node
PULONGLONG SubNodeVCN = (PULONGLONG)((ULONG_PTR)currentIndexExtry + currentIndexExtry->Length - sizeof(ULONGLONG));
DbgPrint(" VCN of sub-node: 0x%llx\n", *SubNodeVCN);
}
CurrentOffset += currentIndexExtry->Length;
ASSERT(currentIndexExtry->Length);
}
}
static
VOID
NtfsDumpAttribute(PDEVICE_EXTENSION Vcb,
PNTFS_ATTR_RECORD Attribute)
{
UNICODE_STRING Name;
ULONGLONG lcn = 0;
ULONGLONG runcount = 0;
switch (Attribute->Type)
{
case AttributeFileName:
NtfsDumpFileNameAttribute(Attribute);
break;
case AttributeStandardInformation:
NtfsDumpStandardInformationAttribute(Attribute);
break;
case AttributeObjectId:
DbgPrint(" $OBJECT_ID ");
break;
case AttributeSecurityDescriptor:
DbgPrint(" $SECURITY_DESCRIPTOR ");
break;
case AttributeVolumeName:
NtfsDumpVolumeNameAttribute(Attribute);
break;
case AttributeVolumeInformation:
NtfsDumpVolumeInformationAttribute(Attribute);
break;
case AttributeData:
DbgPrint(" $DATA ");
//DataBuf = ExAllocatePool(NonPagedPool,AttributeLengthAllocated(Attribute));
break;
case AttributeIndexRoot:
NtfsDumpIndexRootAttribute(Attribute);
break;
case AttributeIndexAllocation:
DbgPrint(" $INDEX_ALLOCATION ");
break;
case AttributeBitmap:
DbgPrint(" $BITMAP ");
break;
case AttributeReparsePoint:
DbgPrint(" $REPARSE_POINT ");
break;
case AttributeEAInformation:
DbgPrint(" $EA_INFORMATION ");
break;
case AttributeEA:
DbgPrint(" $EA ");
break;
case AttributePropertySet:
DbgPrint(" $PROPERTY_SET ");
break;
case AttributeLoggedUtilityStream:
DbgPrint(" $LOGGED_UTILITY_STREAM ");
break;
default:
DbgPrint(" Attribute %lx ",
Attribute->Type);
break;
}
if (Attribute->Type != AttributeAttributeList)
{
if (Attribute->NameLength != 0)
{
Name.Length = Attribute->NameLength * sizeof(WCHAR);
Name.MaximumLength = Name.Length;
Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
DbgPrint("'%wZ' ", &Name);
}
DbgPrint("(%s)\n",
Attribute->IsNonResident ? "non-resident" : "resident");
if (Attribute->IsNonResident)
{
FindRun(Attribute,0,&lcn, &runcount);
DbgPrint(" AllocatedSize %I64u DataSize %I64u InitilizedSize %I64u\n",
Attribute->NonResident.AllocatedSize, Attribute->NonResident.DataSize, Attribute->NonResident.InitializedSize);
DbgPrint(" logical clusters: %I64u - %I64u\n",
lcn, lcn + runcount - 1);
}
else
DbgPrint(" %u bytes of data\n", Attribute->Resident.ValueLength);
}
}
VOID NtfsDumpDataRunData(PUCHAR DataRun)
{
UCHAR DataRunOffsetSize;
UCHAR DataRunLengthSize;
CHAR i;
DbgPrint("%02x ", *DataRun);
if (*DataRun == 0)
return;
DataRunOffsetSize = (*DataRun >> 4) & 0xF;
DataRunLengthSize = *DataRun & 0xF;
DataRun++;
for (i = 0; i < DataRunLengthSize; i++)
{
DbgPrint("%02x ", *DataRun);
DataRun++;
}
for (i = 0; i < DataRunOffsetSize; i++)
{
DbgPrint("%02x ", *DataRun);
DataRun++;
}
NtfsDumpDataRunData(DataRun);
}
VOID
NtfsDumpDataRuns(PVOID StartOfRun,
ULONGLONG CurrentLCN)
{
PUCHAR DataRun = StartOfRun;
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
if (CurrentLCN == 0)
{
DPRINT1("Dumping data runs.\n\tData:\n\t\t");
NtfsDumpDataRunData(StartOfRun);
DbgPrint("\n\tRuns:\n\t\tOff\t\tLCN\t\tLength\n");
}
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
CurrentLCN += DataRunOffset;
DbgPrint("\t\t%I64d\t", DataRunOffset);
if (DataRunOffset < 99999)
DbgPrint("\t");
DbgPrint("%I64u\t", CurrentLCN);
if (CurrentLCN < 99999)
DbgPrint("\t");
DbgPrint("%I64u\n", DataRunLength);
if (*DataRun == 0)
DbgPrint("\t\t00\n");
else
NtfsDumpDataRuns(DataRun, CurrentLCN);
}
VOID
NtfsDumpFileAttributes(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord)
{
NTSTATUS Status;
FIND_ATTR_CONTXT Context;
PNTFS_ATTR_RECORD Attribute;
Status = FindFirstAttribute(&Context, Vcb, FileRecord, FALSE, &Attribute);
while (NT_SUCCESS(Status))
{
NtfsDumpAttribute(Vcb, Attribute);
Status = FindNextAttribute(&Context, &Attribute);
}
FindCloseAttribute(&Context);
}
PFILENAME_ATTRIBUTE
GetFileNameFromRecord(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord,
UCHAR NameType)
{
FIND_ATTR_CONTXT Context;
PNTFS_ATTR_RECORD Attribute;
PFILENAME_ATTRIBUTE Name;
NTSTATUS Status;
Status = FindFirstAttribute(&Context, Vcb, FileRecord, FALSE, &Attribute);
while (NT_SUCCESS(Status))
{
if (Attribute->Type == AttributeFileName)
{
Name = (PFILENAME_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
if (Name->NameType == NameType ||
(Name->NameType == NTFS_FILE_NAME_WIN32_AND_DOS && NameType == NTFS_FILE_NAME_WIN32) ||
(Name->NameType == NTFS_FILE_NAME_WIN32_AND_DOS && NameType == NTFS_FILE_NAME_DOS))
{
FindCloseAttribute(&Context);
return Name;
}
}
Status = FindNextAttribute(&Context, &Attribute);
}
FindCloseAttribute(&Context);
return NULL;
}
/**
* GetPackedByteCount
* Returns the minimum number of bytes needed to represent the value of a
* 64-bit number. Used to encode data runs.
*/
UCHAR
GetPackedByteCount(LONGLONG NumberToPack,
BOOLEAN IsSigned)
{
if (!IsSigned)
{
if (NumberToPack >= 0x0100000000000000)
return 8;
if (NumberToPack >= 0x0001000000000000)
return 7;
if (NumberToPack >= 0x0000010000000000)
return 6;
if (NumberToPack >= 0x0000000100000000)
return 5;
if (NumberToPack >= 0x0000000001000000)
return 4;
if (NumberToPack >= 0x0000000000010000)
return 3;
if (NumberToPack >= 0x0000000000000100)
return 2;
return 1;
}
if (NumberToPack > 0)
{
// we have to make sure the number that gets encoded won't be interpreted as negative
if (NumberToPack >= 0x0080000000000000)
return 8;
if (NumberToPack >= 0x0000800000000000)
return 7;
if (NumberToPack >= 0x0000008000000000)
return 6;
if (NumberToPack >= 0x0000000080000000)
return 5;
if (NumberToPack >= 0x0000000000800000)
return 4;
if (NumberToPack >= 0x0000000000008000)
return 3;
if (NumberToPack >= 0x0000000000000080)
return 2;
}
else
{
// negative number
if (NumberToPack <= 0xff80000000000000)
return 8;
if (NumberToPack <= 0xffff800000000000)
return 7;
if (NumberToPack <= 0xffffff8000000000)
return 6;
if (NumberToPack <= 0xffffffff80000000)
return 5;
if (NumberToPack <= 0xffffffffff800000)
return 4;
if (NumberToPack <= 0xffffffffffff8000)
return 3;
if (NumberToPack <= 0xffffffffffffff80)
return 2;
}
return 1;
}
NTSTATUS
GetLastClusterInDataRun(PDEVICE_EXTENSION Vcb, PNTFS_ATTR_RECORD Attribute, PULONGLONG LastCluster)
{
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
LONGLONG DataRunStartLCN;
ULONGLONG LastLCN = 0;
PUCHAR DataRun = (PUCHAR)Attribute + Attribute->NonResident.MappingPairsOffset;
if (!Attribute->IsNonResident)
return STATUS_INVALID_PARAMETER;
while (1)
{
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
{
// Normal data run.
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
*LastCluster = LastLCN + DataRunLength - 1;
}
if (*DataRun == 0)
break;
}
return STATUS_SUCCESS;
}
PSTANDARD_INFORMATION
GetStandardInformationFromRecord(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord)
{
NTSTATUS Status;
FIND_ATTR_CONTXT Context;
PNTFS_ATTR_RECORD Attribute;
PSTANDARD_INFORMATION StdInfo;
Status = FindFirstAttribute(&Context, Vcb, FileRecord, FALSE, &Attribute);
while (NT_SUCCESS(Status))
{
if (Attribute->Type == AttributeStandardInformation)
{
StdInfo = (PSTANDARD_INFORMATION)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
FindCloseAttribute(&Context);
return StdInfo;
}
Status = FindNextAttribute(&Context, &Attribute);
}
FindCloseAttribute(&Context);
return NULL;
}
/**
* @name GetFileNameAttributeLength
* @implemented
*
* Returns the size of a given FILENAME_ATTRIBUTE, in bytes.
*
* @param FileNameAttribute
* Pointer to a FILENAME_ATTRIBUTE to determine the size of.
*
* @remarks
* The length of a FILENAME_ATTRIBUTE is variable and is dependent on the length of the file name stored at the end.
* This function operates on the FILENAME_ATTRIBUTE proper, so don't try to pass it a PNTFS_ATTR_RECORD.
*/
ULONG GetFileNameAttributeLength(PFILENAME_ATTRIBUTE FileNameAttribute)
{
ULONG Length = FIELD_OFFSET(FILENAME_ATTRIBUTE, Name) + (FileNameAttribute->NameLength * sizeof(WCHAR));
return Length;
}
PFILENAME_ATTRIBUTE
GetBestFileNameFromRecord(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord)
{
PFILENAME_ATTRIBUTE FileName;
FileName = GetFileNameFromRecord(Vcb, FileRecord, NTFS_FILE_NAME_POSIX);
if (FileName == NULL)
{
FileName = GetFileNameFromRecord(Vcb, FileRecord, NTFS_FILE_NAME_WIN32);
if (FileName == NULL)
{
FileName = GetFileNameFromRecord(Vcb, FileRecord, NTFS_FILE_NAME_DOS);
}
}
return FileName;
}
/* EOF */
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