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reactos/drivers/filesystems/ntfs/mft.c
Trevor Thompson 1ac7128da0 [NTFS] - Respect NTFS' file ordering when enumerating a directory. Split off part of BrowseIndexEntries() into a separate function to simplify the code. 
AddNewMftEntry() - Zero the (larger) buffer for the bitmap prior to reading the bitmap.
BrowseIndexEntries() - Check sub-nodes before checking an index entry. Read and use the index bitmap when checking sub-nodes.
+BrowseSubNodeIndexEntries() - Called for sub-nodes of an index when browsing index entries.
+NtfsDumpData() - Diagnostic function which allows for visualizing a series of bytes.

svn path=/branches/GSoC_2016/NTFS/; revision=75817
2017-12-10 11:15:26 +01:00

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/*
* ReactOS kernel
* Copyright (C) 2002, 2014 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/mft.c
* PURPOSE: NTFS filesystem driver
* PROGRAMMERS: Eric Kohl
* Valentin Verkhovsky
* Pierre Schweitzer (pierre@reactos.org)
* Hervé Poussineau (hpoussin@reactos.org)
* Trevor Thompson
*/
/* INCLUDES *****************************************************************/
#include "ntfs.h"
#include <ntintsafe.h>
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ****************************************************************/
PNTFS_ATTR_CONTEXT
PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord)
{
PNTFS_ATTR_CONTEXT Context;
Context = ExAllocatePoolWithTag(NonPagedPool,
sizeof(NTFS_ATTR_CONTEXT),
TAG_NTFS);
if(!Context)
{
DPRINT1("Error: Unable to allocate memory for context!\n");
return NULL;
}
// Allocate memory for a copy of the attribute
Context->pRecord = ExAllocatePoolWithTag(NonPagedPool, AttrRecord->Length, TAG_NTFS);
if(!Context->pRecord)
{
DPRINT1("Error: Unable to allocate memory for attribute record!\n");
ExFreePoolWithTag(Context, TAG_NTFS);
return NULL;
}
// Copy the attribute
RtlCopyMemory(Context->pRecord, AttrRecord, AttrRecord->Length);
if (AttrRecord->IsNonResident)
{
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
ULONGLONG NextVBN = 0;
PUCHAR DataRun = (PUCHAR)((ULONG_PTR)Context->pRecord + Context->pRecord->NonResident.MappingPairsOffset);
Context->CacheRun = DataRun;
Context->CacheRunOffset = 0;
Context->CacheRun = DecodeRun(Context->CacheRun, &DataRunOffset, &DataRunLength);
Context->CacheRunLength = DataRunLength;
if (DataRunOffset != -1)
{
/* Normal run. */
Context->CacheRunStartLCN =
Context->CacheRunLastLCN = DataRunOffset;
}
else
{
/* Sparse run. */
Context->CacheRunStartLCN = -1;
Context->CacheRunLastLCN = 0;
}
Context->CacheRunCurrentOffset = 0;
// Convert the data runs to a map control block
if (!NT_SUCCESS(ConvertDataRunsToLargeMCB(DataRun, &Context->DataRunsMCB, &NextVBN)))
{
DPRINT1("Unable to convert data runs to MCB!\n");
ExFreePoolWithTag(Context->pRecord, TAG_NTFS);
ExFreePoolWithTag(Context, TAG_NTFS);
return NULL;
}
}
return Context;
}
VOID
ReleaseAttributeContext(PNTFS_ATTR_CONTEXT Context)
{
if (Context->pRecord->IsNonResident)
{
FsRtlUninitializeLargeMcb(&Context->DataRunsMCB);
}
if(Context->pRecord)
ExFreePoolWithTag(Context->pRecord, TAG_NTFS);
ExFreePoolWithTag(Context, TAG_NTFS);
}
/**
* @name FindAttribute
* @implemented
*
* Searches a file record for an attribute matching the given type and name.
*
* @param Offset
* Optional pointer to a ULONG that will receive the offset of the found attribute
* from the beginning of the record. Can be set to NULL.
*/
NTSTATUS
FindAttribute(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER MftRecord,
ULONG Type,
PCWSTR Name,
ULONG NameLength,
PNTFS_ATTR_CONTEXT * AttrCtx,
PULONG Offset)
{
BOOLEAN Found;
NTSTATUS Status;
FIND_ATTR_CONTXT Context;
PNTFS_ATTR_RECORD Attribute;
DPRINT("FindAttribute(%p, %p, 0x%x, %S, %lu, %p, %p)\n", Vcb, MftRecord, Type, Name, NameLength, AttrCtx, Offset);
Found = FALSE;
Status = FindFirstAttribute(&Context, Vcb, MftRecord, FALSE, &Attribute);
while (NT_SUCCESS(Status))
{
if (Attribute->Type == Type && Attribute->NameLength == NameLength)
{
if (NameLength != 0)
{
PWCHAR AttrName;
AttrName = (PWCHAR)((PCHAR)Attribute + Attribute->NameOffset);
DPRINT("%.*S, %.*S\n", Attribute->NameLength, AttrName, NameLength, Name);
if (RtlCompareMemory(AttrName, Name, NameLength * sizeof(WCHAR)) == (NameLength * sizeof(WCHAR)))
{
Found = TRUE;
}
}
else
{
Found = TRUE;
}
if (Found)
{
/* Found it, fill up the context and return. */
DPRINT("Found context\n");
*AttrCtx = PrepareAttributeContext(Attribute);
(*AttrCtx)->FileMFTIndex = MftRecord->MFTRecordNumber;
if (Offset != NULL)
*Offset = Context.Offset;
FindCloseAttribute(&Context);
return STATUS_SUCCESS;
}
}
Status = FindNextAttribute(&Context, &Attribute);
}
FindCloseAttribute(&Context);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
ULONGLONG
AttributeAllocatedLength(PNTFS_ATTR_RECORD AttrRecord)
{
if (AttrRecord->IsNonResident)
return AttrRecord->NonResident.AllocatedSize;
else
return ALIGN_UP_BY(AttrRecord->Resident.ValueLength, ATTR_RECORD_ALIGNMENT);
}
ULONGLONG
AttributeDataLength(PNTFS_ATTR_RECORD AttrRecord)
{
if (AttrRecord->IsNonResident)
return AttrRecord->NonResident.DataSize;
else
return AttrRecord->Resident.ValueLength;
}
/**
* @name IncreaseMftSize
* @implemented
*
* Increases the size of the master file table on a volume, increasing the space available for file records.
*
* @param Vcb
* Pointer to the VCB (DEVICE_EXTENSION) of the target volume.
*
*
* @param CanWait
* Boolean indicating if the function is allowed to wait for exclusive access to the master file table.
* This will only be relevant if the MFT doesn't have any free file records and needs to be enlarged.
*
* @return
* STATUS_SUCCESS on success.
* STATUS_INSUFFICIENT_RESOURCES if an allocation fails.
* STATUS_INVALID_PARAMETER if there was an error reading the Mft's bitmap.
* STATUS_CANT_WAIT if CanWait was FALSE and the function could not get immediate, exclusive access to the MFT.
*
* @remarks
* Increases the size of the Master File Table by 64 records. Bitmap entries for the new records are cleared,
* and the bitmap is also enlarged if needed. Mimicking Windows' behavior when enlarging the mft is still TODO.
* This function will wait for exlusive access to the volume fcb.
*/
NTSTATUS
IncreaseMftSize(PDEVICE_EXTENSION Vcb, BOOLEAN CanWait)
{
PNTFS_ATTR_CONTEXT BitmapContext;
LARGE_INTEGER BitmapSize;
LARGE_INTEGER DataSize;
LONGLONG BitmapSizeDifference;
ULONG NewRecords = ATTR_RECORD_ALIGNMENT * 8; // Allocate one new record for every bit of every byte we'll be adding to the bitmap
ULONG DataSizeDifference = Vcb->NtfsInfo.BytesPerFileRecord * NewRecords;
ULONG BitmapOffset;
PUCHAR BitmapBuffer;
ULONGLONG BitmapBytes;
ULONGLONG NewBitmapSize;
ULONGLONG FirstNewMftIndex;
ULONG BytesRead;
ULONG LengthWritten;
PFILE_RECORD_HEADER BlankFileRecord;
ULONG i;
NTSTATUS Status;
DPRINT1("IncreaseMftSize(%p, %s)\n", Vcb, CanWait ? "TRUE" : "FALSE");
// We need exclusive access to the mft while we change its size
if (!ExAcquireResourceExclusiveLite(&(Vcb->DirResource), CanWait))
{
return STATUS_CANT_WAIT;
}
// Create a blank file record that will be used later
BlankFileRecord = NtfsCreateEmptyFileRecord(Vcb);
if (!BlankFileRecord)
{
DPRINT1("Error: Unable to create empty file record!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Clear the flags (file record is not in use)
BlankFileRecord->Flags = 0;
// Find the bitmap attribute of master file table
Status = FindAttribute(Vcb, Vcb->MasterFileTable, AttributeBitmap, L"", 0, &BitmapContext, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find $BITMAP attribute of Mft!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
return Status;
}
// Get size of Bitmap Attribute
BitmapSize.QuadPart = AttributeDataLength(BitmapContext->pRecord);
// Calculate the new mft size
DataSize.QuadPart = AttributeDataLength(Vcb->MFTContext->pRecord) + DataSizeDifference;
// Find the index of the first Mft entry that will be created
FirstNewMftIndex = AttributeDataLength(Vcb->MFTContext->pRecord) / Vcb->NtfsInfo.BytesPerFileRecord;
// Determine how many bytes will make up the bitmap
BitmapBytes = DataSize.QuadPart / Vcb->NtfsInfo.BytesPerFileRecord / 8;
if ((DataSize.QuadPart / Vcb->NtfsInfo.BytesPerFileRecord) % 8 != 0)
BitmapBytes++;
// Windows will always keep the number of bytes in a bitmap as a multiple of 8, so no bytes are wasted on slack
BitmapBytes = ALIGN_UP_BY(BitmapBytes, ATTR_RECORD_ALIGNMENT);
// Determine how much we need to adjust the bitmap size (it's possible we don't)
BitmapSizeDifference = BitmapBytes - BitmapSize.QuadPart;
NewBitmapSize = max(BitmapSize.QuadPart + BitmapSizeDifference, BitmapSize.QuadPart);
// Allocate memory for the bitmap
BitmapBuffer = ExAllocatePoolWithTag(NonPagedPool, NewBitmapSize, TAG_NTFS);
if (!BitmapBuffer)
{
DPRINT1("ERROR: Unable to allocate memory for bitmap attribute!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ReleaseAttributeContext(BitmapContext);
return STATUS_INSUFFICIENT_RESOURCES;
}
// Zero the bytes we'll be adding
RtlZeroMemory(BitmapBuffer, NewBitmapSize);
// Read the bitmap attribute
BytesRead = ReadAttribute(Vcb,
BitmapContext,
0,
(PCHAR)BitmapBuffer,
BitmapSize.LowPart);
if (BytesRead != BitmapSize.LowPart)
{
DPRINT1("ERROR: Bytes read != Bitmap size!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return STATUS_INVALID_PARAMETER;
}
// Increase the mft size
Status = SetNonResidentAttributeDataLength(Vcb, Vcb->MFTContext, Vcb->MftDataOffset, Vcb->MasterFileTable, &DataSize);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to set size of $MFT data attribute!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
// We'll need to find the bitmap again, because its offset will have changed after resizing the data attribute
ReleaseAttributeContext(BitmapContext);
Status = FindAttribute(Vcb, Vcb->MasterFileTable, AttributeBitmap, L"", 0, &BitmapContext, &BitmapOffset);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find $BITMAP attribute of Mft!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
return Status;
}
// If the bitmap grew
if (BitmapSizeDifference > 0)
{
// Set the new bitmap size
BitmapSize.QuadPart = NewBitmapSize;
if (BitmapContext->pRecord->IsNonResident)
Status = SetNonResidentAttributeDataLength(Vcb, BitmapContext, BitmapOffset, Vcb->MasterFileTable, &BitmapSize);
else
Status = SetResidentAttributeDataLength(Vcb, BitmapContext, BitmapOffset, Vcb->MasterFileTable, &BitmapSize);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to set size of bitmap attribute!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
}
NtfsDumpFileAttributes(Vcb, Vcb->MasterFileTable);
// Update the file record with the new attribute sizes
Status = UpdateFileRecord(Vcb, Vcb->VolumeFcb->MFTIndex, Vcb->MasterFileTable);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to update $MFT file record!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
// Write out the new bitmap
Status = WriteAttribute(Vcb, BitmapContext, 0, BitmapBuffer, NewBitmapSize, &LengthWritten, Vcb->MasterFileTable);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
DPRINT1("ERROR: Couldn't write to bitmap attribute of $MFT!\n");
return Status;
}
// Create blank records for the new file record entries.
for (i = 0; i < NewRecords; i++)
{
Status = UpdateFileRecord(Vcb, FirstNewMftIndex + i, BlankFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to write blank file record!\n");
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
}
// Update the mft mirror
Status = UpdateMftMirror(Vcb);
// Cleanup
ExFreePoolWithTag(BlankFileRecord, TAG_NTFS);
ExReleaseResourceLite(&(Vcb->DirResource));
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
/**
* @name MoveAttributes
* @implemented
*
* Moves a block of attributes to a new location in the file Record. The attribute at FirstAttributeToMove
* and every attribute after that will be moved to MoveTo.
*
* @param DeviceExt
* Pointer to the DEVICE_EXTENSION (VCB) of the target volume.
*
* @param FirstAttributeToMove
* Pointer to the first NTFS_ATTR_RECORD that needs to be moved. This pointer must reside within a file record.
*
* @param FirstAttributeOffset
* Offset of FirstAttributeToMove relative to the beginning of the file record.
*
* @param MoveTo
* ULONG_PTR with the memory location that will be the new location of the first attribute being moved.
*
* @return
* The new location of the final attribute (i.e. AttributeEnd marker).
*/
PNTFS_ATTR_RECORD
MoveAttributes(PDEVICE_EXTENSION DeviceExt,
PNTFS_ATTR_RECORD FirstAttributeToMove,
ULONG FirstAttributeOffset,
ULONG_PTR MoveTo)
{
// Get the size of all attributes after this one
ULONG MemBlockSize = 0;
PNTFS_ATTR_RECORD CurrentAttribute = FirstAttributeToMove;
ULONG CurrentOffset = FirstAttributeOffset;
PNTFS_ATTR_RECORD FinalAttribute;
while (CurrentAttribute->Type != AttributeEnd && CurrentOffset < DeviceExt->NtfsInfo.BytesPerFileRecord)
{
CurrentOffset += CurrentAttribute->Length;
MemBlockSize += CurrentAttribute->Length;
CurrentAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)CurrentAttribute + CurrentAttribute->Length);
}
FinalAttribute = (PNTFS_ATTR_RECORD)(MoveTo + MemBlockSize);
MemBlockSize += sizeof(ULONG) * 2; // Add the AttributeEnd and file record end
ASSERT(MemBlockSize % ATTR_RECORD_ALIGNMENT == 0);
// Move the attributes after this one
RtlMoveMemory((PCHAR)MoveTo, FirstAttributeToMove, MemBlockSize);
return FinalAttribute;
}
NTSTATUS
InternalSetResidentAttributeLength(PDEVICE_EXTENSION DeviceExt,
PNTFS_ATTR_CONTEXT AttrContext,
PFILE_RECORD_HEADER FileRecord,
ULONG AttrOffset,
ULONG DataSize)
{
PNTFS_ATTR_RECORD Destination = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
PNTFS_ATTR_RECORD NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)Destination + Destination->Length);
PNTFS_ATTR_RECORD FinalAttribute;
ULONG OldAttributeLength = Destination->Length;
ULONG NextAttributeOffset;
DPRINT1("InternalSetResidentAttributeLength( %p, %p, %p, %lu, %lu )\n", DeviceExt, AttrContext, FileRecord, AttrOffset, DataSize);
ASSERT(!AttrContext->pRecord->IsNonResident);
// Update ValueLength Field
Destination->Resident.ValueLength = DataSize;
// Calculate the record length and end marker offset
Destination->Length = ALIGN_UP_BY(DataSize + AttrContext->pRecord->Resident.ValueOffset, ATTR_RECORD_ALIGNMENT);
NextAttributeOffset = AttrOffset + Destination->Length;
// Ensure NextAttributeOffset is aligned to an 8-byte boundary
ASSERT(NextAttributeOffset % ATTR_RECORD_ALIGNMENT == 0);
// Will the new attribute be larger than the old one?
if (Destination->Length > OldAttributeLength)
{
// Free the old copy of the attribute in the context, as it will be the wrong length
ExFreePoolWithTag(AttrContext->pRecord, TAG_NTFS);
// Create a new copy of the attribute record for the context
AttrContext->pRecord = ExAllocatePoolWithTag(NonPagedPool, Destination->Length, TAG_NTFS);
if (!AttrContext->pRecord)
{
DPRINT1("Unable to allocate memory for attribute!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory((PVOID)((ULONG_PTR)AttrContext->pRecord + OldAttributeLength), Destination->Length - OldAttributeLength);
RtlCopyMemory(AttrContext->pRecord, Destination, OldAttributeLength);
}
// Are there attributes after this one that need to be moved?
if (NextAttribute->Type != AttributeEnd)
{
// Move the attributes after this one
FinalAttribute = MoveAttributes(DeviceExt, NextAttribute, NextAttributeOffset, (ULONG_PTR)Destination + Destination->Length);
}
else
{
// advance to the final "attribute," adjust for the changed length of the attribute we're resizing
FinalAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)NextAttribute - OldAttributeLength + Destination->Length);
}
// Update pRecord's length
AttrContext->pRecord->Length = Destination->Length;
AttrContext->pRecord->Resident.ValueLength = DataSize;
// set the file record end
SetFileRecordEnd(FileRecord, FinalAttribute, FILE_RECORD_END);
//NtfsDumpFileRecord(DeviceExt, FileRecord);
return STATUS_SUCCESS;
}
/**
* @parameter FileRecord
* Pointer to a file record. Must be a full record at least
* Fcb->Vcb->NtfsInfo.BytesPerFileRecord bytes large, not just the header.
*/
NTSTATUS
SetAttributeDataLength(PFILE_OBJECT FileObject,
PNTFS_FCB Fcb,
PNTFS_ATTR_CONTEXT AttrContext,
ULONG AttrOffset,
PFILE_RECORD_HEADER FileRecord,
PLARGE_INTEGER DataSize)
{
NTSTATUS Status = STATUS_SUCCESS;
DPRINT1("SetAttributeDataLength(%p, %p, %p, %lu, %p, %I64u)\n",
FileObject,
Fcb,
AttrContext,
AttrOffset,
FileRecord,
DataSize->QuadPart);
// are we truncating the file?
if (DataSize->QuadPart < AttributeDataLength(AttrContext->pRecord))
{
if (!MmCanFileBeTruncated(FileObject->SectionObjectPointer, DataSize))
{
DPRINT1("Can't truncate a memory-mapped file!\n");
return STATUS_USER_MAPPED_FILE;
}
}
if (AttrContext->pRecord->IsNonResident)
{
Status = SetNonResidentAttributeDataLength(Fcb->Vcb,
AttrContext,
AttrOffset,
FileRecord,
DataSize);
}
else
{
// resident attribute
Status = SetResidentAttributeDataLength(Fcb->Vcb,
AttrContext,
AttrOffset,
FileRecord,
DataSize);
}
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to set size of attribute!\n");
return Status;
}
//NtfsDumpFileAttributes(Fcb->Vcb, FileRecord);
// write the updated file record back to disk
Status = UpdateFileRecord(Fcb->Vcb, Fcb->MFTIndex, FileRecord);
if (NT_SUCCESS(Status))
{
if (AttrContext->pRecord->IsNonResident)
Fcb->RFCB.AllocationSize.QuadPart = AttrContext->pRecord->NonResident.AllocatedSize;
else
Fcb->RFCB.AllocationSize = *DataSize;
Fcb->RFCB.FileSize = *DataSize;
Fcb->RFCB.ValidDataLength = *DataSize;
CcSetFileSizes(FileObject, (PCC_FILE_SIZES)&Fcb->RFCB.AllocationSize);
}
return STATUS_SUCCESS;
}
/**
* @name SetFileRecordEnd
* @implemented
*
* This small function sets a new endpoint for the file record. It set's the final
* AttrEnd->Type to AttributeEnd and recalculates the bytes used by the file record.
*
* @param FileRecord
* Pointer to the file record whose endpoint (length) will be set.
*
* @param AttrEnd
* Pointer to section of memory that will receive the AttributeEnd marker. This must point
* to memory allocated for the FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @param EndMarker
* This value will be written after AttributeEnd but isn't critical at all. When Windows resizes
* a file record, it preserves the final ULONG that previously ended the record, even though this
* value is (to my knowledge) never used. We emulate this behavior.
*
*/
VOID
SetFileRecordEnd(PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttrEnd,
ULONG EndMarker)
{
// Ensure AttrEnd is aligned on an 8-byte boundary, relative to FileRecord
ASSERT(((ULONG_PTR)AttrEnd - (ULONG_PTR)FileRecord) % ATTR_RECORD_ALIGNMENT == 0);
// mark the end of attributes
AttrEnd->Type = AttributeEnd;
// Restore the "file-record-end marker." The value is never checked but this behavior is consistent with Win2k3.
AttrEnd->Length = EndMarker;
// recalculate bytes in use
FileRecord->BytesInUse = (ULONG_PTR)AttrEnd - (ULONG_PTR)FileRecord + sizeof(ULONG) * 2;
}
/**
* @name SetNonResidentAttributeDataLength
* @implemented
*
* Called by SetAttributeDataLength() to set the size of a non-resident attribute. Doesn't update the file record.
*
* @param Vcb
* Pointer to a DEVICE_EXTENSION describing the target disk.
*
* @param AttrContext
* PNTFS_ATTR_CONTEXT describing the location of the attribute whose size is being set.
*
* @param AttrOffset
* Offset, from the beginning of the record, of the attribute being sized.
*
* @param FileRecord
* Pointer to a file record containing the attribute to be resized. Must be a complete file record,
* not just the header.
*
* @param DataSize
* Pointer to a LARGE_INTEGER describing the new size of the attribute's data.
*
* @return
* STATUS_SUCCESS on success;
* STATUS_INSUFFICIENT_RESOURCES if an allocation fails.
* STATUS_INVALID_PARAMETER if we can't find the last cluster in the data run.
*
* @remarks
* Called by SetAttributeDataLength() and IncreaseMftSize(). Use SetAttributeDataLength() unless you have a good
* reason to use this. Doesn't update the file record on disk. Doesn't inform the cache controller of changes with
* any associated files. Synchronization is the callers responsibility.
*/
NTSTATUS
SetNonResidentAttributeDataLength(PDEVICE_EXTENSION Vcb,
PNTFS_ATTR_CONTEXT AttrContext,
ULONG AttrOffset,
PFILE_RECORD_HEADER FileRecord,
PLARGE_INTEGER DataSize)
{
NTSTATUS Status = STATUS_SUCCESS;
ULONG BytesPerCluster = Vcb->NtfsInfo.BytesPerCluster;
ULONGLONG AllocationSize = ROUND_UP(DataSize->QuadPart, BytesPerCluster);
PNTFS_ATTR_RECORD DestinationAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
ULONG ExistingClusters = AttrContext->pRecord->NonResident.AllocatedSize / BytesPerCluster;
ASSERT(AttrContext->pRecord->IsNonResident);
// do we need to increase the allocation size?
if (AttrContext->pRecord->NonResident.AllocatedSize < AllocationSize)
{
ULONG ClustersNeeded = (AllocationSize / BytesPerCluster) - ExistingClusters;
LARGE_INTEGER LastClusterInDataRun;
ULONG NextAssignedCluster;
ULONG AssignedClusters;
if (ExistingClusters == 0)
{
LastClusterInDataRun.QuadPart = 0;
}
else
{
if (!FsRtlLookupLargeMcbEntry(&AttrContext->DataRunsMCB,
(LONGLONG)AttrContext->pRecord->NonResident.HighestVCN,
(PLONGLONG)&LastClusterInDataRun.QuadPart,
NULL,
NULL,
NULL,
NULL))
{
DPRINT1("Error looking up final large MCB entry!\n");
// Most likely, HighestVCN went above the largest mapping
DPRINT1("Highest VCN of record: %I64u\n", AttrContext->pRecord->NonResident.HighestVCN);
return STATUS_INVALID_PARAMETER;
}
}
DPRINT("LastClusterInDataRun: %I64u\n", LastClusterInDataRun.QuadPart);
DPRINT("Highest VCN of record: %I64u\n", AttrContext->pRecord->NonResident.HighestVCN);
while (ClustersNeeded > 0)
{
Status = NtfsAllocateClusters(Vcb,
LastClusterInDataRun.LowPart + 1,
ClustersNeeded,
&NextAssignedCluster,
&AssignedClusters);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to allocate requested clusters!\n");
return Status;
}
// now we need to add the clusters we allocated to the data run
Status = AddRun(Vcb, AttrContext, AttrOffset, FileRecord, NextAssignedCluster, AssignedClusters);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to add data run!\n");
return Status;
}
ClustersNeeded -= AssignedClusters;
LastClusterInDataRun.LowPart = NextAssignedCluster + AssignedClusters - 1;
}
}
else if (AttrContext->pRecord->NonResident.AllocatedSize > AllocationSize)
{
// shrink allocation size
ULONG ClustersToFree = ExistingClusters - (AllocationSize / BytesPerCluster);
Status = FreeClusters(Vcb, AttrContext, AttrOffset, FileRecord, ClustersToFree);
}
// TODO: is the file compressed, encrypted, or sparse?
AttrContext->pRecord->NonResident.AllocatedSize = AllocationSize;
AttrContext->pRecord->NonResident.DataSize = DataSize->QuadPart;
AttrContext->pRecord->NonResident.InitializedSize = DataSize->QuadPart;
DestinationAttribute->NonResident.AllocatedSize = AllocationSize;
DestinationAttribute->NonResident.DataSize = DataSize->QuadPart;
DestinationAttribute->NonResident.InitializedSize = DataSize->QuadPart;
// HighestVCN seems to be set incorrectly somewhere. Apply a hack-fix to reset it.
// HACKHACK FIXME: Fix for sparse files; this math won't work in that case.
AttrContext->pRecord->NonResident.HighestVCN = ((ULONGLONG)AllocationSize / Vcb->NtfsInfo.BytesPerCluster) - 1;
DestinationAttribute->NonResident.HighestVCN = AttrContext->pRecord->NonResident.HighestVCN;
DPRINT("Allocated Size: %I64u\n", DestinationAttribute->NonResident.AllocatedSize);
return Status;
}
/**
* @name SetResidentAttributeDataLength
* @implemented
*
* Called by SetAttributeDataLength() to set the size of a non-resident attribute. Doesn't update the file record.
*
* @param Vcb
* Pointer to a DEVICE_EXTENSION describing the target disk.
*
* @param AttrContext
* PNTFS_ATTR_CONTEXT describing the location of the attribute whose size is being set.
*
* @param AttrOffset
* Offset, from the beginning of the record, of the attribute being sized.
*
* @param FileRecord
* Pointer to a file record containing the attribute to be resized. Must be a complete file record,
* not just the header.
*
* @param DataSize
* Pointer to a LARGE_INTEGER describing the new size of the attribute's data.
*
* @return
* STATUS_SUCCESS on success;
* STATUS_INSUFFICIENT_RESOURCES if an allocation fails.
* STATUS_INVALID_PARAMETER if AttrContext describes a non-resident attribute.
* STATUS_NOT_IMPLEMENTED if requested to decrease the size of an attribute that isn't the
* last attribute listed in the file record.
*
* @remarks
* Called by SetAttributeDataLength() and IncreaseMftSize(). Use SetAttributeDataLength() unless you have a good
* reason to use this. Doesn't update the file record on disk. Doesn't inform the cache controller of changes with
* any associated files. Synchronization is the callers responsibility.
*/
NTSTATUS
SetResidentAttributeDataLength(PDEVICE_EXTENSION Vcb,
PNTFS_ATTR_CONTEXT AttrContext,
ULONG AttrOffset,
PFILE_RECORD_HEADER FileRecord,
PLARGE_INTEGER DataSize)
{
NTSTATUS Status;
// find the next attribute
ULONG NextAttributeOffset = AttrOffset + AttrContext->pRecord->Length;
PNTFS_ATTR_RECORD NextAttribute = (PNTFS_ATTR_RECORD)((PCHAR)FileRecord + NextAttributeOffset);
ASSERT(!AttrContext->pRecord->IsNonResident);
//NtfsDumpFileAttributes(Vcb, FileRecord);
// Do we need to increase the data length?
if (DataSize->QuadPart > AttrContext->pRecord->Resident.ValueLength)
{
// There's usually padding at the end of a record. Do we need to extend past it?
ULONG MaxValueLength = AttrContext->pRecord->Length - AttrContext->pRecord->Resident.ValueOffset;
if (MaxValueLength < DataSize->LowPart)
{
// If this is the last attribute, we could move the end marker to the very end of the file record
MaxValueLength += Vcb->NtfsInfo.BytesPerFileRecord - NextAttributeOffset - (sizeof(ULONG) * 2);
if (MaxValueLength < DataSize->LowPart || NextAttribute->Type != AttributeEnd)
{
// convert attribute to non-resident
PNTFS_ATTR_RECORD Destination = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
PNTFS_ATTR_RECORD NewRecord;
LARGE_INTEGER AttribDataSize;
PVOID AttribData;
ULONG NewRecordLength;
ULONG EndAttributeOffset;
ULONG LengthWritten;
DPRINT1("Converting attribute to non-resident.\n");
AttribDataSize.QuadPart = AttrContext->pRecord->Resident.ValueLength;
// Is there existing data we need to back-up?
if (AttribDataSize.QuadPart > 0)
{
AttribData = ExAllocatePoolWithTag(NonPagedPool, AttribDataSize.QuadPart, TAG_NTFS);
if (AttribData == NULL)
{
DPRINT1("ERROR: Couldn't allocate memory for attribute data. Can't migrate to non-resident!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// read data to temp buffer
Status = ReadAttribute(Vcb, AttrContext, 0, AttribData, AttribDataSize.QuadPart);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Unable to read attribute before migrating!\n");
ExFreePoolWithTag(AttribData, TAG_NTFS);
return Status;
}
}
// Start by turning this attribute into a 0-length, non-resident attribute, then enlarge it.
// The size of a 0-length, non-resident attribute will be 0x41 + the size of the attribute name, aligned to an 8-byte boundary
NewRecordLength = ALIGN_UP_BY(0x41 + (AttrContext->pRecord->NameLength * sizeof(WCHAR)), ATTR_RECORD_ALIGNMENT);
// Create a new attribute record that will store the 0-length, non-resident attribute
NewRecord = ExAllocatePoolWithTag(NonPagedPool, NewRecordLength, TAG_NTFS);
// Zero out the NonResident structure
RtlZeroMemory(NewRecord, NewRecordLength);
// Copy the data that's common to both non-resident and resident attributes
RtlCopyMemory(NewRecord, AttrContext->pRecord, FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.ValueLength));
// if there's a name
if (AttrContext->pRecord->NameLength != 0)
{
// copy the name
// An attribute name will be located at offset 0x18 for a resident attribute, 0x40 for non-resident
RtlCopyMemory((PCHAR)((ULONG_PTR)NewRecord + 0x40),
(PCHAR)((ULONG_PTR)AttrContext->pRecord + 0x18),
AttrContext->pRecord->NameLength * sizeof(WCHAR));
}
// update the mapping pairs offset, which will be 0x40 (size of a non-resident header) + length in bytes of the name
NewRecord->NonResident.MappingPairsOffset = 0x40 + (AttrContext->pRecord->NameLength * sizeof(WCHAR));
// update the end of the file record
// calculate position of end markers (1 byte for empty data run)
EndAttributeOffset = AttrOffset + NewRecord->NonResident.MappingPairsOffset + 1;
EndAttributeOffset = ALIGN_UP_BY(EndAttributeOffset, ATTR_RECORD_ALIGNMENT);
// Update the length
NewRecord->Length = EndAttributeOffset - AttrOffset;
ASSERT(NewRecord->Length == NewRecordLength);
// Copy the new attribute record into the file record
RtlCopyMemory(Destination, NewRecord, NewRecord->Length);
// Update the file record end
SetFileRecordEnd(FileRecord,
(PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + EndAttributeOffset),
FILE_RECORD_END);
// Initialize the MCB, potentially catch an exception
_SEH2_TRY
{
FsRtlInitializeLargeMcb(&AttrContext->DataRunsMCB, NonPagedPool);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
DPRINT1("Unable to create LargeMcb!\n");
if (AttribDataSize.QuadPart > 0)
ExFreePoolWithTag(AttribData, TAG_NTFS);
_SEH2_YIELD(return _SEH2_GetExceptionCode());
} _SEH2_END;
// Mark the attribute as non-resident (we wait until after we know the LargeMcb was initialized)
NewRecord->IsNonResident = Destination->IsNonResident = 1;
// Update file record on disk
Status = UpdateFileRecord(Vcb, AttrContext->FileMFTIndex, FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't update file record to continue migration!\n");
if (AttribDataSize.QuadPart > 0)
ExFreePoolWithTag(AttribData, TAG_NTFS);
return Status;
}
// Now we need to free the old copy of the attribute record in the context and replace it with the new one
ExFreePoolWithTag(AttrContext->pRecord, TAG_NTFS);
AttrContext->pRecord = NewRecord;
// Now we can treat the attribute as non-resident and enlarge it normally
Status = SetNonResidentAttributeDataLength(Vcb, AttrContext, AttrOffset, FileRecord, DataSize);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Unable to migrate resident attribute!\n");
if (AttribDataSize.QuadPart > 0)
ExFreePoolWithTag(AttribData, TAG_NTFS);
return Status;
}
// restore the back-up attribute, if we made one
if (AttribDataSize.QuadPart > 0)
{
Status = WriteAttribute(Vcb, AttrContext, 0, AttribData, AttribDataSize.QuadPart, &LengthWritten, FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Unable to write attribute data to non-resident clusters during migration!\n");
// TODO: Reverse migration so no data is lost
ExFreePoolWithTag(AttribData, TAG_NTFS);
return Status;
}
ExFreePoolWithTag(AttribData, TAG_NTFS);
}
}
}
}
// set the new length of the resident attribute (if we didn't migrate it)
if (!AttrContext->pRecord->IsNonResident)
return InternalSetResidentAttributeLength(Vcb, AttrContext, FileRecord, AttrOffset, DataSize->LowPart);
return STATUS_SUCCESS;
}
ULONG
ReadAttribute(PDEVICE_EXTENSION Vcb,
PNTFS_ATTR_CONTEXT Context,
ULONGLONG Offset,
PCHAR Buffer,
ULONG Length)
{
ULONGLONG LastLCN;
PUCHAR DataRun;
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
LONGLONG DataRunStartLCN;
ULONGLONG CurrentOffset;
ULONG ReadLength;
ULONG AlreadyRead;
NTSTATUS Status;
//TEMPTEMP
PUCHAR TempBuffer;
if (!Context->pRecord->IsNonResident)
{
// We need to truncate Offset to a ULONG for pointer arithmetic
// The check below should ensure that Offset is well within the range of 32 bits
ULONG LittleOffset = (ULONG)Offset;
// Ensure that offset isn't beyond the end of the attribute
if (Offset > Context->pRecord->Resident.ValueLength)
return 0;
if (Offset + Length > Context->pRecord->Resident.ValueLength)
Length = (ULONG)(Context->pRecord->Resident.ValueLength - Offset);
RtlCopyMemory(Buffer, (PVOID)((ULONG_PTR)Context->pRecord + Context->pRecord->Resident.ValueOffset + LittleOffset), Length);
return Length;
}
/*
* Non-resident attribute
*/
/*
* I. Find the corresponding start data run.
*/
AlreadyRead = 0;
// FIXME: Cache seems to be non-working. Disable it for now
//if(Context->CacheRunOffset <= Offset && Offset < Context->CacheRunOffset + Context->CacheRunLength * Volume->ClusterSize)
if (0)
{
DataRun = Context->CacheRun;
LastLCN = Context->CacheRunLastLCN;
DataRunStartLCN = Context->CacheRunStartLCN;
DataRunLength = Context->CacheRunLength;
CurrentOffset = Context->CacheRunCurrentOffset;
}
else
{
//TEMPTEMP
ULONG UsedBufferSize;
TempBuffer = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
LastLCN = 0;
CurrentOffset = 0;
// This will be rewritten in the next iteration to just use the DataRuns MCB directly
ConvertLargeMCBToDataRuns(&Context->DataRunsMCB,
TempBuffer,
Vcb->NtfsInfo.BytesPerFileRecord,
&UsedBufferSize);
DataRun = TempBuffer;
while (1)
{
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
{
/* Normal data run. */
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
else
{
/* Sparse data run. */
DataRunStartLCN = -1;
}
if (Offset >= CurrentOffset &&
Offset < CurrentOffset + (DataRunLength * Vcb->NtfsInfo.BytesPerCluster))
{
break;
}
if (*DataRun == 0)
{
return AlreadyRead;
}
CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
}
}
/*
* II. Go through the run list and read the data
*/
ReadLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset), Length);
if (DataRunStartLCN == -1)
{
RtlZeroMemory(Buffer, ReadLength);
Status = STATUS_SUCCESS;
}
else
{
Status = NtfsReadDisk(Vcb->StorageDevice,
DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster + Offset - CurrentOffset,
ReadLength,
Vcb->NtfsInfo.BytesPerSector,
(PVOID)Buffer,
FALSE);
}
if (NT_SUCCESS(Status))
{
Length -= ReadLength;
Buffer += ReadLength;
AlreadyRead += ReadLength;
if (ReadLength == DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset))
{
CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != (ULONGLONG)-1)
{
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
else
DataRunStartLCN = -1;
}
while (Length > 0)
{
ReadLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster, Length);
if (DataRunStartLCN == -1)
RtlZeroMemory(Buffer, ReadLength);
else
{
Status = NtfsReadDisk(Vcb->StorageDevice,
DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster,
ReadLength,
Vcb->NtfsInfo.BytesPerSector,
(PVOID)Buffer,
FALSE);
if (!NT_SUCCESS(Status))
break;
}
Length -= ReadLength;
Buffer += ReadLength;
AlreadyRead += ReadLength;
/* We finished this request, but there still data in this data run. */
if (Length == 0 && ReadLength != DataRunLength * Vcb->NtfsInfo.BytesPerCluster)
break;
/*
* Go to next run in the list.
*/
if (*DataRun == 0)
break;
CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
{
/* Normal data run. */
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
else
{
/* Sparse data run. */
DataRunStartLCN = -1;
}
} /* while */
} /* if Disk */
// TEMPTEMP
if (Context->pRecord->IsNonResident)
ExFreePoolWithTag(TempBuffer, TAG_NTFS);
Context->CacheRun = DataRun;
Context->CacheRunOffset = Offset + AlreadyRead;
Context->CacheRunStartLCN = DataRunStartLCN;
Context->CacheRunLength = DataRunLength;
Context->CacheRunLastLCN = LastLCN;
Context->CacheRunCurrentOffset = CurrentOffset;
return AlreadyRead;
}
/**
* @name WriteAttribute
* @implemented
*
* Writes an NTFS attribute to the disk. It presently borrows a lot of code from ReadAttribute(),
* and it still needs more documentation / cleaning up.
*
* @param Vcb
* Volume Control Block indicating which volume to write the attribute to
*
* @param Context
* Pointer to an NTFS_ATTR_CONTEXT that has information about the attribute
*
* @param Offset
* Offset, in bytes, from the beginning of the attribute indicating where to start
* writing data
*
* @param Buffer
* The data that's being written to the device
*
* @param Length
* How much data will be written, in bytes
*
* @param RealLengthWritten
* Pointer to a ULONG which will receive how much data was written, in bytes
*
* @param FileRecord
* Optional pointer to a FILE_RECORD_HEADER that contains a copy of the file record
* being written to. Can be NULL, in which case the file record will be read from disk.
* If not-null, WriteAttribute() will skip reading from disk, and FileRecord
* will be updated with the newly-written attribute before the function returns.
*
* @return
* STATUS_SUCCESS if successful, an error code otherwise. STATUS_NOT_IMPLEMENTED if
* writing to a sparse file.
*
* @remarks Note that in this context the word "attribute" isn't referring read-only, hidden,
* etc. - the file's data is actually stored in an attribute in NTFS parlance.
*
*/
NTSTATUS
WriteAttribute(PDEVICE_EXTENSION Vcb,
PNTFS_ATTR_CONTEXT Context,
ULONGLONG Offset,
const PUCHAR Buffer,
ULONG Length,
PULONG RealLengthWritten,
PFILE_RECORD_HEADER FileRecord)
{
ULONGLONG LastLCN;
PUCHAR DataRun;
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
LONGLONG DataRunStartLCN;
ULONGLONG CurrentOffset;
ULONG WriteLength;
NTSTATUS Status;
PUCHAR SourceBuffer = Buffer;
LONGLONG StartingOffset;
BOOLEAN FileRecordAllocated = FALSE;
//TEMPTEMP
PUCHAR TempBuffer;
DPRINT("WriteAttribute(%p, %p, %I64u, %p, %lu, %p, %p)\n", Vcb, Context, Offset, Buffer, Length, RealLengthWritten, FileRecord);
*RealLengthWritten = 0;
// is this a resident attribute?
if (!Context->pRecord->IsNonResident)
{
ULONG AttributeOffset;
PNTFS_ATTR_CONTEXT FoundContext;
PNTFS_ATTR_RECORD Destination;
// Ensure requested data is within the bounds of the attribute
ASSERT(Offset + Length <= Context->pRecord->Resident.ValueLength);
if (Offset + Length > Context->pRecord->Resident.ValueLength)
{
DPRINT1("DRIVER ERROR: Attribute is too small!\n");
return STATUS_INVALID_PARAMETER;
}
// Do we need to read the file record?
if (FileRecord == NULL)
{
FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (!FileRecord)
{
DPRINT1("Error: Couldn't allocate file record!\n");
return STATUS_NO_MEMORY;
}
FileRecordAllocated = TRUE;
// read the file record
ReadFileRecord(Vcb, Context->FileMFTIndex, FileRecord);
}
// find where to write the attribute data to
Status = FindAttribute(Vcb, FileRecord,
Context->pRecord->Type,
(PCWSTR)((ULONG_PTR)Context->pRecord + Context->pRecord->NameOffset),
Context->pRecord->NameLength,
&FoundContext,
&AttributeOffset);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find matching attribute!\n");
if(FileRecordAllocated)
ExFreePoolWithTag(FileRecord, TAG_NTFS);
return Status;
}
Destination = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttributeOffset);
DPRINT("Offset: %I64u, AttributeOffset: %u, ValueOffset: %u\n", Offset, AttributeOffset, Context->pRecord->Resident.ValueLength);
// Will we be writing past the end of the allocated file record?
if (Offset + Length + AttributeOffset + Context->pRecord->Resident.ValueOffset > Vcb->NtfsInfo.BytesPerFileRecord)
{
DPRINT1("DRIVER ERROR: Data being written extends past end of file record!\n");
ReleaseAttributeContext(FoundContext);
if (FileRecordAllocated)
ExFreePoolWithTag(FileRecord, TAG_NTFS);
return STATUS_INVALID_PARAMETER;
}
// copy the data being written into the file record. We cast Offset to ULONG, which is safe because it's range has been verified.
RtlCopyMemory((PCHAR)((ULONG_PTR)Destination + Context->pRecord->Resident.ValueOffset + (ULONG)Offset), Buffer, Length);
Status = UpdateFileRecord(Vcb, Context->FileMFTIndex, FileRecord);
// Update the context's copy of the resident attribute
ASSERT(Context->pRecord->Length == Destination->Length);
RtlCopyMemory((PVOID)Context->pRecord, Destination, Context->pRecord->Length);
ReleaseAttributeContext(FoundContext);
if (FileRecordAllocated)
ExFreePoolWithTag(FileRecord, TAG_NTFS);
if (NT_SUCCESS(Status))
*RealLengthWritten = Length;
return Status;
}
// This is a non-resident attribute.
// I. Find the corresponding start data run.
// FIXME: Cache seems to be non-working. Disable it for now
//if(Context->CacheRunOffset <= Offset && Offset < Context->CacheRunOffset + Context->CacheRunLength * Volume->ClusterSize)
/*if (0)
{
DataRun = Context->CacheRun;
LastLCN = Context->CacheRunLastLCN;
DataRunStartLCN = Context->CacheRunStartLCN;
DataRunLength = Context->CacheRunLength;
CurrentOffset = Context->CacheRunCurrentOffset;
}
else*/
{
ULONG UsedBufferSize;
LastLCN = 0;
CurrentOffset = 0;
// This will be rewritten in the next iteration to just use the DataRuns MCB directly
TempBuffer = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
ConvertLargeMCBToDataRuns(&Context->DataRunsMCB,
TempBuffer,
Vcb->NtfsInfo.BytesPerFileRecord,
&UsedBufferSize);
DataRun = TempBuffer;
while (1)
{
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
{
// Normal data run.
// DPRINT1("Writing to normal data run, LastLCN %I64u DataRunOffset %I64d\n", LastLCN, DataRunOffset);
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
else
{
// Sparse data run. We can't support writing to sparse files yet
// (it may require increasing the allocation size).
DataRunStartLCN = -1;
DPRINT1("FIXME: Writing to sparse files is not supported yet!\n");
return STATUS_NOT_IMPLEMENTED;
}
// Have we reached the data run we're trying to write to?
if (Offset >= CurrentOffset &&
Offset < CurrentOffset + (DataRunLength * Vcb->NtfsInfo.BytesPerCluster))
{
break;
}
if (*DataRun == 0)
{
// We reached the last assigned cluster
// TODO: assign new clusters to the end of the file.
// (Presently, this code will rarely be reached, the write will usually have already failed by now)
// [We can reach here by creating a new file record when the MFT isn't large enough]
DPRINT1("FIXME: Master File Table needs to be enlarged.\n");
return STATUS_END_OF_FILE;
}
CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
}
}
// II. Go through the run list and write the data
/* REVIEWME -- As adapted from NtfsReadAttribute():
We seem to be making a special case for the first applicable data run, but I'm not sure why.
Does it have something to do with (not) caching? Is this strategy equally applicable to writing? */
WriteLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset), Length);
StartingOffset = DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster + Offset - CurrentOffset;
// Write the data to the disk
Status = NtfsWriteDisk(Vcb->StorageDevice,
StartingOffset,
WriteLength,
Vcb->NtfsInfo.BytesPerSector,
(PVOID)SourceBuffer);
// Did the write fail?
if (!NT_SUCCESS(Status))
{
Context->CacheRun = DataRun;
Context->CacheRunOffset = Offset;
Context->CacheRunStartLCN = DataRunStartLCN;
Context->CacheRunLength = DataRunLength;
Context->CacheRunLastLCN = LastLCN;
Context->CacheRunCurrentOffset = CurrentOffset;
return Status;
}
Length -= WriteLength;
SourceBuffer += WriteLength;
*RealLengthWritten += WriteLength;
// Did we write to the end of the data run?
if (WriteLength == DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset))
{
// Advance to the next data run
CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != (ULONGLONG)-1)
{
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
else
DataRunStartLCN = -1;
}
// Do we have more data to write?
while (Length > 0)
{
// Make sure we don't write past the end of the current data run
WriteLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster, Length);
// Are we dealing with a sparse data run?
if (DataRunStartLCN == -1)
{
DPRINT1("FIXME: Don't know how to write to sparse files yet! (DataRunStartLCN == -1)\n");
return STATUS_NOT_IMPLEMENTED;
}
else
{
// write the data to the disk
Status = NtfsWriteDisk(Vcb->StorageDevice,
DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster,
WriteLength,
Vcb->NtfsInfo.BytesPerSector,
(PVOID)SourceBuffer);
if (!NT_SUCCESS(Status))
break;
}
Length -= WriteLength;
SourceBuffer += WriteLength;
*RealLengthWritten += WriteLength;
// We finished this request, but there's still data in this data run.
if (Length == 0 && WriteLength != DataRunLength * Vcb->NtfsInfo.BytesPerCluster)
break;
// Go to next run in the list.
if (*DataRun == 0)
{
// that was the last run
if (Length > 0)
{
// Failed sanity check.
DPRINT1("Encountered EOF before expected!\n");
return STATUS_END_OF_FILE;
}
break;
}
// Advance to the next data run
CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset != -1)
{
// Normal data run.
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
else
{
// Sparse data run.
DataRunStartLCN = -1;
}
} // end while (Length > 0) [more data to write]
// TEMPTEMP
if (Context->pRecord->IsNonResident)
ExFreePoolWithTag(TempBuffer, TAG_NTFS);
Context->CacheRun = DataRun;
Context->CacheRunOffset = Offset + *RealLengthWritten;
Context->CacheRunStartLCN = DataRunStartLCN;
Context->CacheRunLength = DataRunLength;
Context->CacheRunLastLCN = LastLCN;
Context->CacheRunCurrentOffset = CurrentOffset;
return Status;
}
NTSTATUS
ReadFileRecord(PDEVICE_EXTENSION Vcb,
ULONGLONG index,
PFILE_RECORD_HEADER file)
{
ULONGLONG BytesRead;
DPRINT("ReadFileRecord(%p, %I64x, %p)\n", Vcb, index, file);
BytesRead = ReadAttribute(Vcb, Vcb->MFTContext, index * Vcb->NtfsInfo.BytesPerFileRecord, (PCHAR)file, Vcb->NtfsInfo.BytesPerFileRecord);
if (BytesRead != Vcb->NtfsInfo.BytesPerFileRecord)
{
DPRINT1("ReadFileRecord failed: %I64u read, %lu expected\n", BytesRead, Vcb->NtfsInfo.BytesPerFileRecord);
return STATUS_PARTIAL_COPY;
}
/* Apply update sequence array fixups. */
DPRINT("Sequence number: %u\n", file->SequenceNumber);
return FixupUpdateSequenceArray(Vcb, &file->Ntfs);
}
/**
* Searches a file's parent directory (given the parent's index in the mft)
* for the given file. Upon finding an index entry for that file, updates
* Data Size and Allocated Size values in the $FILE_NAME attribute of that entry.
*
* (Most of this code was copied from NtfsFindMftRecord)
*/
NTSTATUS
UpdateFileNameRecord(PDEVICE_EXTENSION Vcb,
ULONGLONG ParentMFTIndex,
PUNICODE_STRING FileName,
BOOLEAN DirSearch,
ULONGLONG NewDataSize,
ULONGLONG NewAllocationSize,
BOOLEAN CaseSensitive)
{
PFILE_RECORD_HEADER MftRecord;
PNTFS_ATTR_CONTEXT IndexRootCtx;
PINDEX_ROOT_ATTRIBUTE IndexRoot;
PCHAR IndexRecord;
PINDEX_ENTRY_ATTRIBUTE IndexEntry, IndexEntryEnd;
NTSTATUS Status;
ULONG CurrentEntry = 0;
DPRINT("UpdateFileNameRecord(%p, %I64d, %wZ, %s, %I64u, %I64u, %s)\n",
Vcb,
ParentMFTIndex,
FileName,
DirSearch ? "TRUE" : "FALSE",
NewDataSize,
NewAllocationSize,
CaseSensitive ? "TRUE" : "FALSE");
MftRecord = ExAllocatePoolWithTag(NonPagedPool,
Vcb->NtfsInfo.BytesPerFileRecord,
TAG_NTFS);
if (MftRecord == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(Vcb, ParentMFTIndex, MftRecord);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return Status;
}
ASSERT(MftRecord->Ntfs.Type == NRH_FILE_TYPE);
Status = FindAttribute(Vcb, MftRecord, AttributeIndexRoot, L"$I30", 4, &IndexRootCtx, NULL);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return Status;
}
IndexRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerIndexRecord, TAG_NTFS);
if (IndexRecord == NULL)
{
ReleaseAttributeContext(IndexRootCtx);
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadAttribute(Vcb, IndexRootCtx, 0, IndexRecord, AttributeDataLength(IndexRootCtx->pRecord));
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to read Index Root!\n");
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
ReleaseAttributeContext(IndexRootCtx);
ExFreePoolWithTag(MftRecord, TAG_NTFS);
}
IndexRoot = (PINDEX_ROOT_ATTRIBUTE)IndexRecord;
IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)&IndexRoot->Header + IndexRoot->Header.FirstEntryOffset);
// Index root is always resident.
IndexEntryEnd = (PINDEX_ENTRY_ATTRIBUTE)(IndexRecord + IndexRoot->Header.TotalSizeOfEntries);
DPRINT("IndexRecordSize: %x IndexBlockSize: %x\n", Vcb->NtfsInfo.BytesPerIndexRecord, IndexRoot->SizeOfEntry);
Status = UpdateIndexEntryFileNameSize(Vcb,
MftRecord,
IndexRecord,
IndexRoot->SizeOfEntry,
IndexEntry,
IndexEntryEnd,
FileName,
&CurrentEntry,
&CurrentEntry,
DirSearch,
NewDataSize,
NewAllocationSize,
CaseSensitive);
if (Status == STATUS_PENDING)
{
// we need to write the index root attribute back to disk
ULONG LengthWritten;
Status = WriteAttribute(Vcb, IndexRootCtx, 0, (PUCHAR)IndexRecord, AttributeDataLength(IndexRootCtx->pRecord), &LengthWritten, MftRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't update Index Root!\n");
}
}
ReleaseAttributeContext(IndexRootCtx);
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return Status;
}
/**
* Recursively searches directory index and applies the size update to the $FILE_NAME attribute of the
* proper index entry.
* (Heavily based on BrowseIndexEntries)
*/
NTSTATUS
UpdateIndexEntryFileNameSize(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER MftRecord,
PCHAR IndexRecord,
ULONG IndexBlockSize,
PINDEX_ENTRY_ATTRIBUTE FirstEntry,
PINDEX_ENTRY_ATTRIBUTE LastEntry,
PUNICODE_STRING FileName,
PULONG StartEntry,
PULONG CurrentEntry,
BOOLEAN DirSearch,
ULONGLONG NewDataSize,
ULONGLONG NewAllocatedSize,
BOOLEAN CaseSensitive)
{
NTSTATUS Status;
ULONG RecordOffset;
PINDEX_ENTRY_ATTRIBUTE IndexEntry;
PNTFS_ATTR_CONTEXT IndexAllocationCtx;
ULONGLONG IndexAllocationSize;
PINDEX_BUFFER IndexBuffer;
DPRINT("UpdateIndexEntrySize(%p, %p, %p, %lu, %p, %p, %wZ, %lu, %lu, %s, %I64u, %I64u, %s)\n",
Vcb,
MftRecord,
IndexRecord,
IndexBlockSize,
FirstEntry,
LastEntry,
FileName,
*StartEntry,
*CurrentEntry,
DirSearch ? "TRUE" : "FALSE",
NewDataSize,
NewAllocatedSize,
CaseSensitive ? "TRUE" : "FALSE");
// find the index entry responsible for the file we're trying to update
IndexEntry = FirstEntry;
while (IndexEntry < LastEntry &&
!(IndexEntry->Flags & NTFS_INDEX_ENTRY_END))
{
if ((IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK) > NTFS_FILE_FIRST_USER_FILE &&
*CurrentEntry >= *StartEntry &&
IndexEntry->FileName.NameType != NTFS_FILE_NAME_DOS &&
CompareFileName(FileName, IndexEntry, DirSearch, CaseSensitive))
{
*StartEntry = *CurrentEntry;
IndexEntry->FileName.DataSize = NewDataSize;
IndexEntry->FileName.AllocatedSize = NewAllocatedSize;
// indicate that the caller will still need to write the structure to the disk
return STATUS_PENDING;
}
(*CurrentEntry) += 1;
ASSERT(IndexEntry->Length >= sizeof(INDEX_ENTRY_ATTRIBUTE));
IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry + IndexEntry->Length);
}
/* If we're already browsing a subnode */
if (IndexRecord == NULL)
{
return STATUS_OBJECT_PATH_NOT_FOUND;
}
/* If there's no subnode */
if (!(IndexEntry->Flags & NTFS_INDEX_ENTRY_NODE))
{
return STATUS_OBJECT_PATH_NOT_FOUND;
}
Status = FindAttribute(Vcb, MftRecord, AttributeIndexAllocation, L"$I30", 4, &IndexAllocationCtx, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT("Corrupted filesystem!\n");
return Status;
}
IndexAllocationSize = AttributeDataLength(IndexAllocationCtx->pRecord);
Status = STATUS_OBJECT_PATH_NOT_FOUND;
for (RecordOffset = 0; RecordOffset < IndexAllocationSize; RecordOffset += IndexBlockSize)
{
ReadAttribute(Vcb, IndexAllocationCtx, RecordOffset, IndexRecord, IndexBlockSize);
Status = FixupUpdateSequenceArray(Vcb, &((PFILE_RECORD_HEADER)IndexRecord)->Ntfs);
if (!NT_SUCCESS(Status))
{
break;
}
IndexBuffer = (PINDEX_BUFFER)IndexRecord;
ASSERT(IndexBuffer->Ntfs.Type == NRH_INDX_TYPE);
ASSERT(IndexBuffer->Header.AllocatedSize + FIELD_OFFSET(INDEX_BUFFER, Header) == IndexBlockSize);
FirstEntry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)&IndexBuffer->Header + IndexBuffer->Header.FirstEntryOffset);
LastEntry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)&IndexBuffer->Header + IndexBuffer->Header.TotalSizeOfEntries);
ASSERT(LastEntry <= (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)IndexBuffer + IndexBlockSize));
Status = UpdateIndexEntryFileNameSize(NULL,
NULL,
NULL,
0,
FirstEntry,
LastEntry,
FileName,
StartEntry,
CurrentEntry,
DirSearch,
NewDataSize,
NewAllocatedSize,
CaseSensitive);
if (Status == STATUS_PENDING)
{
// write the index record back to disk
ULONG Written;
// first we need to update the fixup values for the index block
Status = AddFixupArray(Vcb, &((PFILE_RECORD_HEADER)IndexRecord)->Ntfs);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Failed to update fixup sequence array!\n");
break;
}
Status = WriteAttribute(Vcb, IndexAllocationCtx, RecordOffset, (const PUCHAR)IndexRecord, IndexBlockSize, &Written, MftRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR Performing write!\n");
break;
}
Status = STATUS_SUCCESS;
break;
}
if (NT_SUCCESS(Status))
{
break;
}
}
ReleaseAttributeContext(IndexAllocationCtx);
return Status;
}
/**
* @name UpdateFileRecord
* @implemented
*
* Writes a file record to the master file table, at a given index.
*
* @param Vcb
* Pointer to the DEVICE_EXTENSION of the target drive being written to.
*
* @param MftIndex
* Target index in the master file table to store the file record.
*
* @param FileRecord
* Pointer to the complete file record which will be written to the master file table.
*
* @return
* STATUS_SUCCESSFUL on success. An error passed from WriteAttribute() otherwise.
*
*/
NTSTATUS
UpdateFileRecord(PDEVICE_EXTENSION Vcb,
ULONGLONG MftIndex,
PFILE_RECORD_HEADER FileRecord)
{
ULONG BytesWritten;
NTSTATUS Status = STATUS_SUCCESS;
DPRINT("UpdateFileRecord(%p, 0x%I64x, %p)\n", Vcb, MftIndex, FileRecord);
// Add the fixup array to prepare the data for writing to disk
AddFixupArray(Vcb, &FileRecord->Ntfs);
// write the file record to the master file table
Status = WriteAttribute(Vcb,
Vcb->MFTContext,
MftIndex * Vcb->NtfsInfo.BytesPerFileRecord,
(const PUCHAR)FileRecord,
Vcb->NtfsInfo.BytesPerFileRecord,
&BytesWritten,
FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("UpdateFileRecord failed: %lu written, %lu expected\n", BytesWritten, Vcb->NtfsInfo.BytesPerFileRecord);
}
// remove the fixup array (so the file record pointer can still be used)
FixupUpdateSequenceArray(Vcb, &FileRecord->Ntfs);
return Status;
}
NTSTATUS
FixupUpdateSequenceArray(PDEVICE_EXTENSION Vcb,
PNTFS_RECORD_HEADER Record)
{
USHORT *USA;
USHORT USANumber;
USHORT USACount;
USHORT *Block;
USA = (USHORT*)((PCHAR)Record + Record->UsaOffset);
USANumber = *(USA++);
USACount = Record->UsaCount - 1; /* Exclude the USA Number. */
Block = (USHORT*)((PCHAR)Record + Vcb->NtfsInfo.BytesPerSector - 2);
DPRINT("FixupUpdateSequenceArray(%p, %p)\nUSANumber: %u\tUSACount: %u\n", Vcb, Record, USANumber, USACount);
while (USACount)
{
if (*Block != USANumber)
{
DPRINT1("Mismatch with USA: %u read, %u expected\n" , *Block, USANumber);
return STATUS_UNSUCCESSFUL;
}
*Block = *(USA++);
Block = (USHORT*)((PCHAR)Block + Vcb->NtfsInfo.BytesPerSector);
USACount--;
}
return STATUS_SUCCESS;
}
/**
* @name AddNewMftEntry
* @implemented
*
* Adds a file record to the master file table of a given device.
*
* @param FileRecord
* Pointer to a complete file record which will be saved to disk.
*
* @param DeviceExt
* Pointer to the DEVICE_EXTENSION of the target drive.
*
* @param DestinationIndex
* Pointer to a ULONGLONG which will receive the MFT index where the file record was stored.
*
* @param CanWait
* Boolean indicating if the function is allowed to wait for exclusive access to the master file table.
* This will only be relevant if the MFT doesn't have any free file records and needs to be enlarged.
*
* @return
* STATUS_SUCCESS on success.
* STATUS_OBJECT_NAME_NOT_FOUND if we can't find the MFT's $Bitmap or if we weren't able
* to read the attribute.
* STATUS_INSUFFICIENT_RESOURCES if we can't allocate enough memory for a copy of $Bitmap.
* STATUS_CANT_WAIT if CanWait was FALSE and the function could not get immediate, exclusive access to the MFT.
*/
NTSTATUS
AddNewMftEntry(PFILE_RECORD_HEADER FileRecord,
PDEVICE_EXTENSION DeviceExt,
PULONGLONG DestinationIndex,
BOOLEAN CanWait)
{
NTSTATUS Status = STATUS_SUCCESS;
ULONGLONG MftIndex;
RTL_BITMAP Bitmap;
ULONGLONG BitmapDataSize;
ULONGLONG AttrBytesRead;
PUCHAR BitmapData;
PUCHAR BitmapBuffer;
ULONG LengthWritten;
PNTFS_ATTR_CONTEXT BitmapContext;
LARGE_INTEGER BitmapBits;
UCHAR SystemReservedBits;
DPRINT1("AddNewMftEntry(%p, %p, %p, %s)\n", FileRecord, DeviceExt, DestinationIndex, CanWait ? "TRUE" : "FALSE");
// First, we have to read the mft's $Bitmap attribute
// Find the attribute
Status = FindAttribute(DeviceExt, DeviceExt->MasterFileTable, AttributeBitmap, L"", 0, &BitmapContext, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find $Bitmap attribute of master file table!\n");
return Status;
}
// Get size of bitmap
BitmapDataSize = AttributeDataLength(BitmapContext->pRecord);
// RtlInitializeBitmap wants a ULONG-aligned pointer, and wants the memory passed to it to be a ULONG-multiple
// Allocate a buffer for the $Bitmap attribute plus enough to ensure we can get a ULONG-aligned pointer
BitmapBuffer = ExAllocatePoolWithTag(NonPagedPool, BitmapDataSize + sizeof(ULONG), TAG_NTFS);
if (!BitmapBuffer)
{
ReleaseAttributeContext(BitmapContext);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(BitmapBuffer, BitmapDataSize + sizeof(ULONG));
// Get a ULONG-aligned pointer for the bitmap itself
BitmapData = (PUCHAR)ALIGN_UP_BY((ULONG_PTR)BitmapBuffer, sizeof(ULONG));
// read $Bitmap attribute
AttrBytesRead = ReadAttribute(DeviceExt, BitmapContext, 0, (PCHAR)BitmapData, BitmapDataSize);
if (AttrBytesRead != BitmapDataSize)
{
DPRINT1("ERROR: Unable to read $Bitmap attribute of master file table!\n");
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
// We need to backup the bits for records 0x10 - 0x17 (3rd byte of bitmap) and mark these records
// as in-use so we don't assign files to those indices. They're reserved for the system (e.g. ChkDsk).
SystemReservedBits = BitmapData[2];
BitmapData[2] = 0xff;
// Calculate bit count
BitmapBits.QuadPart = AttributeDataLength(DeviceExt->MFTContext->pRecord) /
DeviceExt->NtfsInfo.BytesPerFileRecord;
if (BitmapBits.HighPart != 0)
{
DPRINT1("\tFIXME: bitmap sizes beyond 32bits are not yet supported! (Your NTFS volume is too large)\n");
NtfsGlobalData->EnableWriteSupport = FALSE;
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return STATUS_NOT_IMPLEMENTED;
}
// convert buffer into bitmap
RtlInitializeBitMap(&Bitmap, (PULONG)BitmapData, BitmapBits.LowPart);
// set next available bit, preferrably after 23rd bit
MftIndex = RtlFindClearBitsAndSet(&Bitmap, 1, 24);
if ((LONG)MftIndex == -1)
{
DPRINT1("Couldn't find free space in MFT for file record, increasing MFT size.\n");
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
// Couldn't find a free record in the MFT, add some blank records and try again
Status = IncreaseMftSize(DeviceExt, CanWait);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find space in MFT for file or increase MFT size!\n");
return Status;
}
return AddNewMftEntry(FileRecord, DeviceExt, DestinationIndex, CanWait);
}
DPRINT1("Creating file record at MFT index: %I64u\n", MftIndex);
// update file record with index
FileRecord->MFTRecordNumber = MftIndex;
// [BitmapData should have been updated via RtlFindClearBitsAndSet()]
// Restore the system reserved bits
BitmapData[2] = SystemReservedBits;
// write the bitmap back to the MFT's $Bitmap attribute
Status = WriteAttribute(DeviceExt, BitmapContext, 0, BitmapData, BitmapDataSize, &LengthWritten, FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR encountered when writing $Bitmap attribute!\n");
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
// update the file record (write it to disk)
Status = UpdateFileRecord(DeviceExt, MftIndex, FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Unable to write file record!\n");
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
*DestinationIndex = MftIndex;
ExFreePoolWithTag(BitmapBuffer, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
return Status;
}
/**
* @name NtfsAddFilenameToDirectory
* @implemented
*
* Adds a $FILE_NAME attribute to a given directory index.
*
* @param DeviceExt
* Points to the target disk's DEVICE_EXTENSION.
*
* @param DirectoryMftIndex
* Mft index of the parent directory which will receive the file.
*
* @param FileReferenceNumber
* File reference of the file to be added to the directory. This is a combination of the
* Mft index and sequence number.
*
* @param FilenameAttribute
* Pointer to the FILENAME_ATTRIBUTE of the file being added to the directory.
*
* @param CaseSensitive
* Boolean indicating if the function should operate in case-sensitive mode. This will be TRUE
* if an application created the file with the FILE_FLAG_POSIX_SEMANTICS flag.
*
* @return
* STATUS_SUCCESS on success.
* STATUS_INSUFFICIENT_RESOURCES if an allocation fails.
* STATUS_NOT_IMPLEMENTED if target address isn't at the end of the given file record.
*
* @remarks
* WIP - Can only support a few files in a directory.
* One FILENAME_ATTRIBUTE is added to the directory's index for each link to that file. So, each
* file which contains one FILENAME_ATTRIBUTE for a long name and another for the 8.3 name, will
* get both attributes added to its parent directory.
*/
NTSTATUS
NtfsAddFilenameToDirectory(PDEVICE_EXTENSION DeviceExt,
ULONGLONG DirectoryMftIndex,
ULONGLONG FileReferenceNumber,
PFILENAME_ATTRIBUTE FilenameAttribute,
BOOLEAN CaseSensitive)
{
NTSTATUS Status = STATUS_SUCCESS;
PFILE_RECORD_HEADER ParentFileRecord;
PNTFS_ATTR_CONTEXT IndexRootContext;
PINDEX_ROOT_ATTRIBUTE I30IndexRoot;
ULONG IndexRootOffset;
ULONGLONG I30IndexRootLength;
ULONG LengthWritten;
PINDEX_ROOT_ATTRIBUTE NewIndexRoot;
ULONG AttributeLength;
PNTFS_ATTR_RECORD NextAttribute;
PB_TREE NewTree;
ULONG BtreeIndexLength;
ULONG MaxIndexRootSize;
PB_TREE_KEY NewLeftKey;
PB_TREE_FILENAME_NODE NewRightHandNode;
LARGE_INTEGER MinIndexRootSize;
ULONG NewMaxIndexRootSize;
ULONG NodeSize;
// Allocate memory for the parent directory
ParentFileRecord = ExAllocatePoolWithTag(NonPagedPool,
DeviceExt->NtfsInfo.BytesPerFileRecord,
TAG_NTFS);
if (!ParentFileRecord)
{
DPRINT1("ERROR: Couldn't allocate memory for file record!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Open the parent directory
Status = ReadFileRecord(DeviceExt, DirectoryMftIndex, ParentFileRecord);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
DPRINT1("ERROR: Couldn't read parent directory with index %I64u\n",
DirectoryMftIndex);
return Status;
}
#ifndef NDEBUG
DPRINT1("Dumping old parent file record:\n");
NtfsDumpFileRecord(DeviceExt, ParentFileRecord);
#endif
// Find the index root attribute for the directory
Status = FindAttribute(DeviceExt,
ParentFileRecord,
AttributeIndexRoot,
L"$I30",
4,
&IndexRootContext,
&IndexRootOffset);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find $I30 $INDEX_ROOT attribute for parent directory with MFT #: %I64u!\n",
DirectoryMftIndex);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// Find the maximum index size given what the file record can hold
// First, find the max index size assuming index root is the last attribute
MaxIndexRootSize = DeviceExt->NtfsInfo.BytesPerFileRecord // Start with the size of a file record
- IndexRootOffset // Subtract the length of everything that comes before index root
- IndexRootContext->pRecord->Resident.ValueOffset // Subtract the length of the attribute header for index root
- sizeof(INDEX_ROOT_ATTRIBUTE) // Subtract the length of the index root header
- (sizeof(ULONG) * 2); // Subtract the length of the file record end marker and padding
// Are there attributes after this one?
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)ParentFileRecord + IndexRootOffset + IndexRootContext->pRecord->Length);
if (NextAttribute->Type != AttributeEnd)
{
// Find the length of all attributes after this one, not counting the end marker
ULONG LengthOfAttributes = 0;
PNTFS_ATTR_RECORD CurrentAttribute = NextAttribute;
while (CurrentAttribute->Type != AttributeEnd)
{
LengthOfAttributes += CurrentAttribute->Length;
CurrentAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)CurrentAttribute + CurrentAttribute->Length);
}
// Leave room for the existing attributes
MaxIndexRootSize -= LengthOfAttributes;
}
// Allocate memory for the index root data
I30IndexRootLength = AttributeDataLength(IndexRootContext->pRecord);
I30IndexRoot = ExAllocatePoolWithTag(NonPagedPool, I30IndexRootLength, TAG_NTFS);
if (!I30IndexRoot)
{
DPRINT1("ERROR: Couldn't allocate memory for index root attribute!\n");
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return STATUS_INSUFFICIENT_RESOURCES;
}
// Read the Index Root
Status = ReadAttribute(DeviceExt, IndexRootContext, 0, (PCHAR)I30IndexRoot, I30IndexRootLength);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couln't read index root attribute for Mft index #%I64u\n", DirectoryMftIndex);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// Convert the index to a B*Tree
Status = CreateBTreeFromIndex(DeviceExt,
ParentFileRecord,
IndexRootContext,
I30IndexRoot,
&NewTree);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to create B-Tree from Index!\n");
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
#ifndef NDEBUG
DumpBTree(NewTree);
#endif
// Insert the key for the file we're adding
Status = NtfsInsertKey(NewTree,
FileReferenceNumber,
FilenameAttribute,
NewTree->RootNode,
CaseSensitive,
MaxIndexRootSize,
I30IndexRoot->SizeOfEntry,
&NewLeftKey,
&NewRightHandNode);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to insert key into B-Tree!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
#ifndef NDEBUG
DumpBTree(NewTree);
#endif
// The root node can't be split
ASSERT(NewLeftKey == NULL);
ASSERT(NewRightHandNode == NULL);
// Convert B*Tree back to Index
// Updating the index allocation can change the size available for the index root,
// And if the index root is demoted, the index allocation will need to be updated again,
// which may change the size available for index root... etc.
// My solution is to decrease index root to the size it would be if it was demoted,
// then UpdateIndexAllocation will have an accurate representation of the maximum space
// it can use in the file record. There's still a chance that the act of allocating an
// index node after demoting the index root will increase the size of the file record beyond
// it's limit, but if that happens, an attribute-list will most definitely be needed.
// This a bit hacky, but it seems to be functional.
// Calculate the minimum size of the index root attribute, considering one dummy key and one VCN
MinIndexRootSize.QuadPart = sizeof(INDEX_ROOT_ATTRIBUTE) // size of the index root headers
+ 0x18; // Size of dummy key with a VCN for a subnode
ASSERT(MinIndexRootSize.QuadPart % ATTR_RECORD_ALIGNMENT == 0);
// Temporarily shrink the index root to it's minimal size
AttributeLength = MinIndexRootSize.LowPart;
AttributeLength += sizeof(INDEX_ROOT_ATTRIBUTE);
// FIXME: IndexRoot will probably be invalid until we're finished. If we fail before we finish, the directory will probably be toast.
// The potential for catastrophic data-loss exists!!! :)
// Update the length of the attribute in the file record of the parent directory
Status = InternalSetResidentAttributeLength(DeviceExt,
IndexRootContext,
ParentFileRecord,
IndexRootOffset,
AttributeLength);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Unable to set length of index root!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// Update the index allocation
Status = UpdateIndexAllocation(DeviceExt, NewTree, I30IndexRoot->SizeOfEntry, ParentFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to update index allocation from B-Tree!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
#ifndef NDEBUG
DPRINT1("Index Allocation updated\n");
DumpBTree(NewTree);
#endif
// Find the maximum index root size given what the file record can hold
// First, find the max index size assuming index root is the last attribute
NewMaxIndexRootSize =
DeviceExt->NtfsInfo.BytesPerFileRecord // Start with the size of a file record
- IndexRootOffset // Subtract the length of everything that comes before index root
- IndexRootContext->pRecord->Resident.ValueOffset // Subtract the length of the attribute header for index root
- sizeof(INDEX_ROOT_ATTRIBUTE) // Subtract the length of the index root header
- (sizeof(ULONG) * 2); // Subtract the length of the file record end marker and padding
// Are there attributes after this one?
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)ParentFileRecord + IndexRootOffset + IndexRootContext->pRecord->Length);
if (NextAttribute->Type != AttributeEnd)
{
// Find the length of all attributes after this one, not counting the end marker
ULONG LengthOfAttributes = 0;
PNTFS_ATTR_RECORD CurrentAttribute = NextAttribute;
while (CurrentAttribute->Type != AttributeEnd)
{
LengthOfAttributes += CurrentAttribute->Length;
CurrentAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)CurrentAttribute + CurrentAttribute->Length);
}
// Leave room for the existing attributes
NewMaxIndexRootSize -= LengthOfAttributes;
}
// The index allocation and index bitmap may have grown, leaving less room for the index root,
// so now we need to double-check that index root isn't too large
NodeSize = GetSizeOfIndexEntries(NewTree->RootNode);
if (NodeSize > NewMaxIndexRootSize)
{
DPRINT1("Demoting index root.\nNodeSize: 0x%lx\nNewMaxIndexRootSize: 0x%lx\n", NodeSize, NewMaxIndexRootSize);
Status = DemoteBTreeRoot(NewTree);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to demote index root!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// We need to update the index allocation once more
Status = UpdateIndexAllocation(DeviceExt, NewTree, I30IndexRoot->SizeOfEntry, ParentFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to update index allocation from B-Tree!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// re-recalculate max size of index root
NewMaxIndexRootSize =
// Find the maximum index size given what the file record can hold
// First, find the max index size assuming index root is the last attribute
DeviceExt->NtfsInfo.BytesPerFileRecord // Start with the size of a file record
- IndexRootOffset // Subtract the length of everything that comes before index root
- IndexRootContext->pRecord->Resident.ValueOffset // Subtract the length of the attribute header for index root
- sizeof(INDEX_ROOT_ATTRIBUTE) // Subtract the length of the index root header
- (sizeof(ULONG) * 2); // Subtract the length of the file record end marker and padding
// Are there attributes after this one?
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)ParentFileRecord + IndexRootOffset + IndexRootContext->pRecord->Length);
if (NextAttribute->Type != AttributeEnd)
{
// Find the length of all attributes after this one, not counting the end marker
ULONG LengthOfAttributes = 0;
PNTFS_ATTR_RECORD CurrentAttribute = NextAttribute;
while (CurrentAttribute->Type != AttributeEnd)
{
LengthOfAttributes += CurrentAttribute->Length;
CurrentAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)CurrentAttribute + CurrentAttribute->Length);
}
// Leave room for the existing attributes
NewMaxIndexRootSize -= LengthOfAttributes;
}
}
// Create the Index Root from the B*Tree
Status = CreateIndexRootFromBTree(DeviceExt, NewTree, NewMaxIndexRootSize, &NewIndexRoot, &BtreeIndexLength);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to create Index root from B-Tree!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// We're done with the B-Tree now
DestroyBTree(NewTree);
// Write back the new index root attribute to the parent directory file record
// First, we need to resize the attribute.
// CreateIndexRootFromBTree() should have verified that the index root fits within MaxIndexSize.
// We can't set the size as we normally would, because $INDEX_ROOT must always be resident.
AttributeLength = NewIndexRoot->Header.AllocatedSize + FIELD_OFFSET(INDEX_ROOT_ATTRIBUTE, Header);
if (AttributeLength != IndexRootContext->pRecord->Resident.ValueLength)
{
// Update the length of the attribute in the file record of the parent directory
Status = InternalSetResidentAttributeLength(DeviceExt,
IndexRootContext,
ParentFileRecord,
IndexRootOffset,
AttributeLength);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(NewIndexRoot, TAG_NTFS);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
DPRINT1("ERROR: Unable to set resident attribute length!\n");
return Status;
}
}
NT_ASSERT(ParentFileRecord->BytesInUse <= DeviceExt->NtfsInfo.BytesPerFileRecord);
Status = UpdateFileRecord(DeviceExt, DirectoryMftIndex, ParentFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to update file record of directory with index: %llx\n", DirectoryMftIndex);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
ExFreePoolWithTag(NewIndexRoot, TAG_NTFS);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
return Status;
}
// Write the new index root to disk
Status = WriteAttribute(DeviceExt,
IndexRootContext,
0,
(PUCHAR)NewIndexRoot,
AttributeLength,
&LengthWritten,
ParentFileRecord);
if (!NT_SUCCESS(Status) || LengthWritten != AttributeLength)
{
DPRINT1("ERROR: Unable to write new index root attribute to parent directory!\n");
ExFreePoolWithTag(NewIndexRoot, TAG_NTFS);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// re-read the parent file record, so we can dump it
Status = ReadFileRecord(DeviceExt, DirectoryMftIndex, ParentFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't read parent directory after messing with it!\n");
}
else
{
#ifndef NDEBUG
DPRINT1("Dumping new B-Tree:\n");
Status = CreateBTreeFromIndex(DeviceExt, ParentFileRecord, IndexRootContext, NewIndexRoot, &NewTree);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't re-create b-tree\n");
return Status;
}
DumpBTree(NewTree);
DestroyBTree(NewTree);
NtfsDumpFileRecord(DeviceExt, ParentFileRecord);
#endif
}
// Cleanup
ExFreePoolWithTag(NewIndexRoot, TAG_NTFS);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
NTSTATUS
AddFixupArray(PDEVICE_EXTENSION Vcb,
PNTFS_RECORD_HEADER Record)
{
USHORT *pShortToFixUp;
ULONG ArrayEntryCount = Record->UsaCount - 1;
ULONG Offset = Vcb->NtfsInfo.BytesPerSector - 2;
ULONG i;
PFIXUP_ARRAY fixupArray = (PFIXUP_ARRAY)((UCHAR*)Record + Record->UsaOffset);
DPRINT("AddFixupArray(%p, %p)\n fixupArray->USN: %u, ArrayEntryCount: %u\n", Vcb, Record, fixupArray->USN, ArrayEntryCount);
fixupArray->USN++;
for (i = 0; i < ArrayEntryCount; i++)
{
DPRINT("USN: %u\tOffset: %u\n", fixupArray->USN, Offset);
pShortToFixUp = (USHORT*)((PCHAR)Record + Offset);
fixupArray->Array[i] = *pShortToFixUp;
*pShortToFixUp = fixupArray->USN;
Offset += Vcb->NtfsInfo.BytesPerSector;
}
return STATUS_SUCCESS;
}
NTSTATUS
ReadLCN(PDEVICE_EXTENSION Vcb,
ULONGLONG lcn,
ULONG count,
PVOID buffer)
{
LARGE_INTEGER DiskSector;
DiskSector.QuadPart = lcn;
return NtfsReadSectors(Vcb->StorageDevice,
DiskSector.u.LowPart * Vcb->NtfsInfo.SectorsPerCluster,
count * Vcb->NtfsInfo.SectorsPerCluster,
Vcb->NtfsInfo.BytesPerSector,
buffer,
FALSE);
}
BOOLEAN
CompareFileName(PUNICODE_STRING FileName,
PINDEX_ENTRY_ATTRIBUTE IndexEntry,
BOOLEAN DirSearch,
BOOLEAN CaseSensitive)
{
BOOLEAN Ret, Alloc = FALSE;
UNICODE_STRING EntryName;
EntryName.Buffer = IndexEntry->FileName.Name;
EntryName.Length =
EntryName.MaximumLength = IndexEntry->FileName.NameLength * sizeof(WCHAR);
if (DirSearch)
{
UNICODE_STRING IntFileName;
if (!CaseSensitive)
{
NT_VERIFY(NT_SUCCESS(RtlUpcaseUnicodeString(&IntFileName, FileName, TRUE)));
Alloc = TRUE;
}
else
{
IntFileName = *FileName;
}
Ret = FsRtlIsNameInExpression(&IntFileName, &EntryName, !CaseSensitive, NULL);
if (Alloc)
{
RtlFreeUnicodeString(&IntFileName);
}
return Ret;
}
else
{
return (RtlCompareUnicodeString(FileName, &EntryName, !CaseSensitive) == 0);
}
}
/**
* @name UpdateMftMirror
* @implemented
*
* Backs-up the first ~4 master file table entries to the $MFTMirr file.
*
* @param Vcb
* Pointer to an NTFS_VCB for the volume whose Mft mirror is being updated.
*
* @return
* STATUS_SUCCESS on success.
* STATUS_INSUFFICIENT_RESOURCES if an allocation failed.
* STATUS_UNSUCCESSFUL if we couldn't read the master file table.
*
* @remarks
* NTFS maintains up-to-date copies of the first several mft entries in the $MFTMirr file. Usually, the first 4 file
* records from the mft are stored. The exact number of entries is determined by the size of $MFTMirr's $DATA.
* If $MFTMirr is not up-to-date, chkdsk will reject every change it can find prior to when $MFTMirr was last updated.
* Therefore, it's recommended to call this function if the volume changes considerably. For instance, IncreaseMftSize()
* relies on this function to keep chkdsk from deleting the mft entries it creates. Note that under most instances, creating
* or deleting a file will not affect the first ~four mft entries, and so will not require updating the mft mirror.
*/
NTSTATUS
UpdateMftMirror(PNTFS_VCB Vcb)
{
PFILE_RECORD_HEADER MirrorFileRecord;
PNTFS_ATTR_CONTEXT MirrDataContext;
PNTFS_ATTR_CONTEXT MftDataContext;
PCHAR DataBuffer;
ULONGLONG DataLength;
NTSTATUS Status;
ULONG BytesRead;
ULONG LengthWritten;
// Allocate memory for the Mft mirror file record
MirrorFileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (!MirrorFileRecord)
{
DPRINT1("Error: Failed to allocate memory for $MFTMirr!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Read the Mft Mirror file record
Status = ReadFileRecord(Vcb, NTFS_FILE_MFTMIRR, MirrorFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to read $MFTMirr!\n");
ExFreePoolWithTag(MirrorFileRecord, TAG_NTFS);
return Status;
}
// Find the $DATA attribute of $MFTMirr
Status = FindAttribute(Vcb, MirrorFileRecord, AttributeData, L"", 0, &MirrDataContext, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find $DATA attribute!\n");
ExFreePoolWithTag(MirrorFileRecord, TAG_NTFS);
return Status;
}
// Find the $DATA attribute of $MFT
Status = FindAttribute(Vcb, Vcb->MasterFileTable, AttributeData, L"", 0, &MftDataContext, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find $DATA attribute!\n");
ReleaseAttributeContext(MirrDataContext);
ExFreePoolWithTag(MirrorFileRecord, TAG_NTFS);
return Status;
}
// Get the size of the mirror's $DATA attribute
DataLength = AttributeDataLength(MirrDataContext->pRecord);
ASSERT(DataLength % Vcb->NtfsInfo.BytesPerFileRecord == 0);
// Create buffer for the mirror's $DATA attribute
DataBuffer = ExAllocatePoolWithTag(NonPagedPool, DataLength, TAG_NTFS);
if (!DataBuffer)
{
DPRINT1("Error: Couldn't allocate memory for $DATA buffer!\n");
ReleaseAttributeContext(MftDataContext);
ReleaseAttributeContext(MirrDataContext);
ExFreePoolWithTag(MirrorFileRecord, TAG_NTFS);
return STATUS_INSUFFICIENT_RESOURCES;
}
ASSERT(DataLength < ULONG_MAX);
// Back up the first several entries of the Mft's $DATA Attribute
BytesRead = ReadAttribute(Vcb, MftDataContext, 0, DataBuffer, (ULONG)DataLength);
if (BytesRead != (ULONG)DataLength)
{
DPRINT1("Error: Failed to read $DATA for $MFTMirr!\n");
ReleaseAttributeContext(MftDataContext);
ReleaseAttributeContext(MirrDataContext);
ExFreePoolWithTag(DataBuffer, TAG_NTFS);
ExFreePoolWithTag(MirrorFileRecord, TAG_NTFS);
return STATUS_UNSUCCESSFUL;
}
// Write the mirror's $DATA attribute
Status = WriteAttribute(Vcb,
MirrDataContext,
0,
(PUCHAR)DataBuffer,
DataLength,
&LengthWritten,
MirrorFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to write $DATA attribute of $MFTMirr!\n");
}
// Cleanup
ReleaseAttributeContext(MftDataContext);
ReleaseAttributeContext(MirrDataContext);
ExFreePoolWithTag(DataBuffer, TAG_NTFS);
ExFreePoolWithTag(MirrorFileRecord, TAG_NTFS);
return Status;
}
#if 0
static
VOID
DumpIndexEntry(PINDEX_ENTRY_ATTRIBUTE IndexEntry)
{
DPRINT1("Entry: %p\n", IndexEntry);
DPRINT1("\tData.Directory.IndexedFile: %I64x\n", IndexEntry->Data.Directory.IndexedFile);
DPRINT1("\tLength: %u\n", IndexEntry->Length);
DPRINT1("\tKeyLength: %u\n", IndexEntry->KeyLength);
DPRINT1("\tFlags: %x\n", IndexEntry->Flags);
DPRINT1("\tReserved: %x\n", IndexEntry->Reserved);
DPRINT1("\t\tDirectoryFileReferenceNumber: %I64x\n", IndexEntry->FileName.DirectoryFileReferenceNumber);
DPRINT1("\t\tCreationTime: %I64u\n", IndexEntry->FileName.CreationTime);
DPRINT1("\t\tChangeTime: %I64u\n", IndexEntry->FileName.ChangeTime);
DPRINT1("\t\tLastWriteTime: %I64u\n", IndexEntry->FileName.LastWriteTime);
DPRINT1("\t\tLastAccessTime: %I64u\n", IndexEntry->FileName.LastAccessTime);
DPRINT1("\t\tAllocatedSize: %I64u\n", IndexEntry->FileName.AllocatedSize);
DPRINT1("\t\tDataSize: %I64u\n", IndexEntry->FileName.DataSize);
DPRINT1("\t\tFileAttributes: %x\n", IndexEntry->FileName.FileAttributes);
DPRINT1("\t\tNameLength: %u\n", IndexEntry->FileName.NameLength);
DPRINT1("\t\tNameType: %x\n", IndexEntry->FileName.NameType);
DPRINT1("\t\tName: %.*S\n", IndexEntry->FileName.NameLength, IndexEntry->FileName.Name);
}
#endif
NTSTATUS
BrowseSubNodeIndexEntries(PNTFS_VCB Vcb,
PFILE_RECORD_HEADER MftRecord,
ULONG IndexBlockSize,
PUNICODE_STRING FileName,
PNTFS_ATTR_CONTEXT IndexAllocationContext,
PRTL_BITMAP Bitmap,
ULONGLONG VCN,
PULONG StartEntry,
PULONG CurrentEntry,
BOOLEAN DirSearch,
BOOLEAN CaseSensitive,
ULONGLONG *OutMFTIndex)
{
PINDEX_BUFFER IndexRecord;
ULONGLONG Offset;
ULONG BytesRead;
PINDEX_ENTRY_ATTRIBUTE FirstEntry;
PINDEX_ENTRY_ATTRIBUTE LastEntry;
PINDEX_ENTRY_ATTRIBUTE IndexEntry;
ULONG NodeNumber;
NTSTATUS Status;
DPRINT("BrowseSubNodeIndexEntries(%p, %p, %lu, %wZ, %p, %p, %I64d, %lu, %lu, %s, %s, %p)\n",
Vcb,
MftRecord,
IndexBlockSize,
FileName,
IndexAllocationContext,
Bitmap,
VCN,
*StartEntry,
*CurrentEntry,
"FALSE",
DirSearch ? "TRUE" : "FALSE",
CaseSensitive ? "TRUE" : "FALSE",
OutMFTIndex);
// Calculate node number as VCN / Clusters per index record
NodeNumber = VCN / (Vcb->NtfsInfo.BytesPerIndexRecord / Vcb->NtfsInfo.BytesPerCluster);
// Is the bit for this node clear in the bitmap?
if (!RtlCheckBit(Bitmap, NodeNumber))
{
DPRINT1("File system corruption detected, node with VCN %I64u is being reused or is marked as deleted.\n", VCN);
return STATUS_DATA_ERROR;
}
// Clear the bit for this node so it can't be recursively referenced
RtlClearBits(Bitmap, NodeNumber, 1);
// Allocate memory for the index record
IndexRecord = ExAllocatePoolWithTag(NonPagedPool, IndexBlockSize, TAG_NTFS);
if (!IndexRecord)
{
DPRINT1("Unable to allocate memory for index record!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
// Calculate offset of index record
Offset = VCN * Vcb->NtfsInfo.BytesPerCluster;
// Read the index record
BytesRead = ReadAttribute(Vcb, IndexAllocationContext, Offset, (PCHAR)IndexRecord, IndexBlockSize);
if (BytesRead != IndexBlockSize)
{
DPRINT1("Unable to read index record!\n");
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
return STATUS_UNSUCCESSFUL;
}
// Assert that we're dealing with an index record here
ASSERT(IndexRecord->Ntfs.Type == NRH_INDX_TYPE);
// Apply the fixup array to the index record
Status = FixupUpdateSequenceArray(Vcb, &((PFILE_RECORD_HEADER)IndexRecord)->Ntfs);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
DPRINT1("Failed to apply fixup array!\n");
return Status;
}
ASSERT(IndexRecord->Header.AllocatedSize + FIELD_OFFSET(INDEX_BUFFER, Header) == IndexBlockSize);
FirstEntry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)&IndexRecord->Header + IndexRecord->Header.FirstEntryOffset);
LastEntry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)&IndexRecord->Header + IndexRecord->Header.TotalSizeOfEntries);
ASSERT(LastEntry <= (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)IndexRecord + IndexBlockSize));
// Loop through all Index Entries of index, starting with FirstEntry
IndexEntry = FirstEntry;
while (IndexEntry <= LastEntry)
{
// Does IndexEntry have a sub-node?
if (IndexEntry->Flags & NTFS_INDEX_ENTRY_NODE)
{
if (!(IndexRecord->Header.Flags & INDEX_NODE_LARGE) || !IndexAllocationContext)
{
DPRINT1("Filesystem corruption detected!\n");
}
else
{
Status = BrowseSubNodeIndexEntries(Vcb,
MftRecord,
IndexBlockSize,
FileName,
IndexAllocationContext,
Bitmap,
GetIndexEntryVCN(IndexEntry),
StartEntry,
CurrentEntry,
DirSearch,
CaseSensitive,
OutMFTIndex);
if (NT_SUCCESS(Status))
{
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
return Status;
}
}
}
// Are we done?
if (IndexEntry->Flags & NTFS_INDEX_ENTRY_END)
break;
// If we've found a file whose index is greater than or equal to StartEntry that matches the search criteria
if ((IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK) >= NTFS_FILE_FIRST_USER_FILE &&
*CurrentEntry >= *StartEntry &&
IndexEntry->FileName.NameType != NTFS_FILE_NAME_DOS &&
CompareFileName(FileName, IndexEntry, DirSearch, CaseSensitive))
{
*StartEntry = *CurrentEntry;
*OutMFTIndex = (IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK);
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
return STATUS_SUCCESS;
}
// Advance to the next index entry
(*CurrentEntry) += 1;
ASSERT(IndexEntry->Length >= sizeof(INDEX_ENTRY_ATTRIBUTE));
IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry + IndexEntry->Length);
}
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
return STATUS_OBJECT_PATH_NOT_FOUND;
}
NTSTATUS
BrowseIndexEntries(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER MftRecord,
PINDEX_ROOT_ATTRIBUTE IndexRecord,
ULONG IndexBlockSize,
PINDEX_ENTRY_ATTRIBUTE FirstEntry,
PINDEX_ENTRY_ATTRIBUTE LastEntry,
PUNICODE_STRING FileName,
PULONG StartEntry,
PULONG CurrentEntry,
BOOLEAN DirSearch,
BOOLEAN CaseSensitive,
ULONGLONG *OutMFTIndex)
{
NTSTATUS Status;
PINDEX_ENTRY_ATTRIBUTE IndexEntry;
PNTFS_ATTR_CONTEXT IndexAllocationContext;
PNTFS_ATTR_CONTEXT BitmapContext;
PCHAR *BitmapMem;
ULONG *BitmapPtr;
RTL_BITMAP Bitmap;
DPRINT("BrowseIndexEntries(%p, %p, %p, %lu, %p, %p, %wZ, %lu, %lu, %s, %s, %p)\n",
Vcb,
MftRecord,
IndexRecord,
IndexBlockSize,
FirstEntry,
LastEntry,
FileName,
*StartEntry,
*CurrentEntry,
DirSearch ? "TRUE" : "FALSE",
CaseSensitive ? "TRUE" : "FALSE",
OutMFTIndex);
// Find the $I30 index allocation, if there is one
Status = FindAttribute(Vcb, MftRecord, AttributeIndexAllocation, L"$I30", 4, &IndexAllocationContext, NULL);
if (NT_SUCCESS(Status))
{
ULONGLONG BitmapLength;
// Find the bitmap attribute for the index
Status = FindAttribute(Vcb, MftRecord, AttributeBitmap, L"$I30", 4, &BitmapContext, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("Potential file system corruption detected!\n");
ReleaseAttributeContext(IndexAllocationContext);
return Status;
}
// Get the length of the bitmap attribute
BitmapLength = AttributeDataLength(BitmapContext->pRecord);
// Allocate memory for the bitmap, including some padding; RtlInitializeBitmap() wants a pointer
// that's ULONG-aligned, and it wants the size of the memory allocated for it to be a ULONG-multiple.
BitmapMem = ExAllocatePoolWithTag(NonPagedPool, BitmapLength + sizeof(ULONG), TAG_NTFS);
if (!BitmapMem)
{
DPRINT1("Error: failed to allocate bitmap!");
ReleaseAttributeContext(BitmapContext);
ReleaseAttributeContext(IndexAllocationContext);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(BitmapMem, BitmapLength + sizeof(ULONG));
// RtlInitializeBitmap() wants a pointer that's ULONG-aligned.
BitmapPtr = (PULONG)ALIGN_UP_BY((ULONG_PTR)BitmapMem, sizeof(ULONG));
// Read the existing bitmap data
Status = ReadAttribute(Vcb, BitmapContext, 0, (PCHAR)BitmapPtr, BitmapLength);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to read bitmap attribute!\n");
ExFreePoolWithTag(BitmapMem, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
ReleaseAttributeContext(IndexAllocationContext);
return Status;
}
// Initialize bitmap
RtlInitializeBitMap(&Bitmap, BitmapPtr, BitmapLength * 8);
}
else
{
// Couldn't find an index allocation
IndexAllocationContext = NULL;
}
// Loop through all Index Entries of index, starting with FirstEntry
IndexEntry = FirstEntry;
while (IndexEntry <= LastEntry)
{
// Does IndexEntry have a sub-node?
if (IndexEntry->Flags & NTFS_INDEX_ENTRY_NODE)
{
if (!(IndexRecord->Header.Flags & INDEX_ROOT_LARGE) || !IndexAllocationContext)
{
DPRINT1("Filesystem corruption detected!\n");
}
else
{
Status = BrowseSubNodeIndexEntries(Vcb,
MftRecord,
IndexBlockSize,
FileName,
IndexAllocationContext,
&Bitmap,
GetIndexEntryVCN(IndexEntry),
StartEntry,
CurrentEntry,
DirSearch,
CaseSensitive,
OutMFTIndex);
if (NT_SUCCESS(Status))
{
ExFreePoolWithTag(BitmapMem, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
ReleaseAttributeContext(IndexAllocationContext);
return Status;
}
}
}
// Are we done?
if (IndexEntry->Flags & NTFS_INDEX_ENTRY_END)
break;
// If we've found a file whose index is greater than or equal to StartEntry that matches the search criteria
if ((IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK) >= NTFS_FILE_FIRST_USER_FILE &&
*CurrentEntry >= *StartEntry &&
IndexEntry->FileName.NameType != NTFS_FILE_NAME_DOS &&
CompareFileName(FileName, IndexEntry, DirSearch, CaseSensitive))
{
*StartEntry = *CurrentEntry;
*OutMFTIndex = (IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK);
if (IndexAllocationContext)
{
ExFreePoolWithTag(BitmapMem, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
ReleaseAttributeContext(IndexAllocationContext);
}
return STATUS_SUCCESS;
}
// Advance to the next index entry
(*CurrentEntry) += 1;
ASSERT(IndexEntry->Length >= sizeof(INDEX_ENTRY_ATTRIBUTE));
IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry + IndexEntry->Length);
}
if (IndexAllocationContext)
{
ExFreePoolWithTag(BitmapMem, TAG_NTFS);
ReleaseAttributeContext(BitmapContext);
ReleaseAttributeContext(IndexAllocationContext);
}
return STATUS_OBJECT_PATH_NOT_FOUND;
}
NTSTATUS
NtfsFindMftRecord(PDEVICE_EXTENSION Vcb,
ULONGLONG MFTIndex,
PUNICODE_STRING FileName,
PULONG FirstEntry,
BOOLEAN DirSearch,
BOOLEAN CaseSensitive,
ULONGLONG *OutMFTIndex)
{
PFILE_RECORD_HEADER MftRecord;
PNTFS_ATTR_CONTEXT IndexRootCtx;
PINDEX_ROOT_ATTRIBUTE IndexRoot;
PCHAR IndexRecord;
PINDEX_ENTRY_ATTRIBUTE IndexEntry, IndexEntryEnd;
NTSTATUS Status;
ULONG CurrentEntry = 0;
DPRINT("NtfsFindMftRecord(%p, %I64d, %wZ, %lu, %s, %s, %p)\n",
Vcb,
MFTIndex,
FileName,
*FirstEntry,
DirSearch ? "TRUE" : "FALSE",
CaseSensitive ? "TRUE" : "FALSE",
OutMFTIndex);
MftRecord = ExAllocatePoolWithTag(NonPagedPool,
Vcb->NtfsInfo.BytesPerFileRecord,
TAG_NTFS);
if (MftRecord == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(Vcb, MFTIndex, MftRecord);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return Status;
}
ASSERT(MftRecord->Ntfs.Type == NRH_FILE_TYPE);
Status = FindAttribute(Vcb, MftRecord, AttributeIndexRoot, L"$I30", 4, &IndexRootCtx, NULL);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return Status;
}
IndexRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerIndexRecord, TAG_NTFS);
if (IndexRecord == NULL)
{
ReleaseAttributeContext(IndexRootCtx);
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return STATUS_INSUFFICIENT_RESOURCES;
}
ReadAttribute(Vcb, IndexRootCtx, 0, IndexRecord, Vcb->NtfsInfo.BytesPerIndexRecord);
IndexRoot = (PINDEX_ROOT_ATTRIBUTE)IndexRecord;
IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)&IndexRoot->Header + IndexRoot->Header.FirstEntryOffset);
/* Index root is always resident. */
IndexEntryEnd = (PINDEX_ENTRY_ATTRIBUTE)(IndexRecord + IndexRoot->Header.TotalSizeOfEntries);
ReleaseAttributeContext(IndexRootCtx);
DPRINT("IndexRecordSize: %x IndexBlockSize: %x\n", Vcb->NtfsInfo.BytesPerIndexRecord, IndexRoot->SizeOfEntry);
Status = BrowseIndexEntries(Vcb,
MftRecord,
(PINDEX_ROOT_ATTRIBUTE)IndexRecord,
IndexRoot->SizeOfEntry,
IndexEntry,
IndexEntryEnd,
FileName,
FirstEntry,
&CurrentEntry,
DirSearch,
CaseSensitive,
OutMFTIndex);
ExFreePoolWithTag(IndexRecord, TAG_NTFS);
ExFreePoolWithTag(MftRecord, TAG_NTFS);
return Status;
}
NTSTATUS
NtfsLookupFileAt(PDEVICE_EXTENSION Vcb,
PUNICODE_STRING PathName,
BOOLEAN CaseSensitive,
PFILE_RECORD_HEADER *FileRecord,
PULONGLONG MFTIndex,
ULONGLONG CurrentMFTIndex)
{
UNICODE_STRING Current, Remaining;
NTSTATUS Status;
ULONG FirstEntry = 0;
DPRINT("NtfsLookupFileAt(%p, %wZ, %s, %p, %p, %I64x)\n",
Vcb,
PathName,
CaseSensitive ? "TRUE" : "FALSE",
FileRecord,
MFTIndex,
CurrentMFTIndex);
FsRtlDissectName(*PathName, &Current, &Remaining);
while (Current.Length != 0)
{
DPRINT("Current: %wZ\n", &Current);
Status = NtfsFindMftRecord(Vcb, CurrentMFTIndex, &Current, &FirstEntry, FALSE, CaseSensitive, &CurrentMFTIndex);
if (!NT_SUCCESS(Status))
{
return Status;
}
if (Remaining.Length == 0)
break;
FsRtlDissectName(Current, &Current, &Remaining);
}
*FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (*FileRecord == NULL)
{
DPRINT("NtfsLookupFileAt: Can't allocate MFT record\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(Vcb, CurrentMFTIndex, *FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT("NtfsLookupFileAt: Can't read MFT record\n");
ExFreePoolWithTag(*FileRecord, TAG_NTFS);
return Status;
}
*MFTIndex = CurrentMFTIndex;
return STATUS_SUCCESS;
}
NTSTATUS
NtfsLookupFile(PDEVICE_EXTENSION Vcb,
PUNICODE_STRING PathName,
BOOLEAN CaseSensitive,
PFILE_RECORD_HEADER *FileRecord,
PULONGLONG MFTIndex)
{
return NtfsLookupFileAt(Vcb, PathName, CaseSensitive, FileRecord, MFTIndex, NTFS_FILE_ROOT);
}
void
NtfsDumpData(ULONG_PTR Buffer, ULONG Length)
{
ULONG i, j;
// dump binary data, 8 bytes at a time
for (i = 0; i < Length; i += 8)
{
// display current offset, in hex
DbgPrint("\t%03x\t", i);
// display hex value of each of the next 8 bytes
for (j = 0; j < 8; j++)
DbgPrint("%02x ", *(PUCHAR)(Buffer + i + j));
DbgPrint("\n");
}
}
/**
* @name NtfsDumpFileRecord
* @implemented
*
* Provides diagnostic information about a file record. Prints a hex dump
* of the entire record (based on the size reported by FileRecord->ByesInUse),
* then prints a dump of each attribute.
*
* @param Vcb
* Pointer to a DEVICE_EXTENSION describing the volume.
*
* @param FileRecord
* Pointer to the file record to be analyzed.
*
* @remarks
* FileRecord must be a complete file record at least FileRecord->BytesAllocated
* in size, and not just the header.
*
*/
VOID
NtfsDumpFileRecord(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord)
{
ULONG i, j;
// dump binary data, 8 bytes at a time
for (i = 0; i < FileRecord->BytesInUse; i += 8)
{
// display current offset, in hex
DbgPrint("\t%03x\t", i);
// display hex value of each of the next 8 bytes
for (j = 0; j < 8; j++)
DbgPrint("%02x ", *(PUCHAR)((ULONG_PTR)FileRecord + i + j));
DbgPrint("\n");
}
NtfsDumpFileAttributes(Vcb, FileRecord);
}
NTSTATUS
NtfsFindFileAt(PDEVICE_EXTENSION Vcb,
PUNICODE_STRING SearchPattern,
PULONG FirstEntry,
PFILE_RECORD_HEADER *FileRecord,
PULONGLONG MFTIndex,
ULONGLONG CurrentMFTIndex,
BOOLEAN CaseSensitive)
{
NTSTATUS Status;
DPRINT("NtfsFindFileAt(%p, %wZ, %lu, %p, %p, %I64x, %s)\n",
Vcb,
SearchPattern,
*FirstEntry,
FileRecord,
MFTIndex,
CurrentMFTIndex,
(CaseSensitive ? "TRUE" : "FALSE"));
Status = NtfsFindMftRecord(Vcb, CurrentMFTIndex, SearchPattern, FirstEntry, TRUE, CaseSensitive, &CurrentMFTIndex);
if (!NT_SUCCESS(Status))
{
DPRINT("NtfsFindFileAt: NtfsFindMftRecord() failed with status 0x%08lx\n", Status);
return Status;
}
*FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (*FileRecord == NULL)
{
DPRINT("NtfsFindFileAt: Can't allocate MFT record\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(Vcb, CurrentMFTIndex, *FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT("NtfsFindFileAt: Can't read MFT record\n");
ExFreePoolWithTag(*FileRecord, TAG_NTFS);
return Status;
}
*MFTIndex = CurrentMFTIndex;
return STATUS_SUCCESS;
}
/* EOF */
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