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[NTFS]

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Implement GetVolumeBitmap().

This allows NFI to find which file is at which LCN: http://www.heisspiter.net/~Pierre/rostests/NTFS_NFI_LCN.png

So far, NFI is not as verbose as it is on Windows in such cases, because FILE_OPEN_BY_FILE_ID is *still* unimplemented (you should consider implementing it Pierre ;-)).
I checked with Windows, the correct file is found though!

CORE-8725

svn path=/trunk/; revision=65645
This commit is contained in:
Pierre Schweitzer 2014-12-14 18:13:57 +00:00
parent 37d3115479
commit ecb8f375f8
1 changed files with 58 additions and 2 deletions
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60
reactos/drivers/filesystems/ntfs/fsctl.c
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@ -666,6 +666,11 @@ GetVolumeBitmap(PDEVICE_EXTENSION DeviceExt,
PIO_STACK_LOCATION Stack;
PVOLUME_BITMAP_BUFFER BitmapBuffer;
LONGLONG StartingLcn;
PFILE_RECORD_HEADER BitmapRecord;
PNTFS_ATTR_CONTEXT DataContext;
ULONGLONG TotalClusters;
ULONGLONG ToCopy;
BOOLEAN Overflow = FALSE;
DPRINT1("GetVolumeBitmap(%p, %p)\n", DeviceExt, Irp);
@ -722,8 +727,59 @@ GetVolumeBitmap(PDEVICE_EXTENSION DeviceExt,
return STATUS_INVALID_PARAMETER;
}
UNIMPLEMENTED;
return STATUS_NOT_IMPLEMENTED;
/* Round down to a multiple of 8 */
StartingLcn = StartingLcn & ~7;
TotalClusters = DeviceExt->NtfsInfo.ClusterCount - StartingLcn;
ToCopy = TotalClusters / 8;
if ((ToCopy + FIELD_OFFSET(VOLUME_BITMAP_BUFFER, Buffer)) > Stack->Parameters.FileSystemControl.OutputBufferLength)
{
DPRINT1("Buffer too small: %x, needed: %x\n", Stack->Parameters.FileSystemControl.OutputBufferLength, (ToCopy + FIELD_OFFSET(VOLUME_BITMAP_BUFFER, Buffer)));
Overflow = TRUE;
ToCopy = Stack->Parameters.FileSystemControl.OutputBufferLength - FIELD_OFFSET(VOLUME_BITMAP_BUFFER, Buffer);
}
BitmapRecord = ExAllocatePoolWithTag(NonPagedPool,
DeviceExt->NtfsInfo.BytesPerFileRecord,
TAG_NTFS);
if (BitmapRecord == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(DeviceExt, NTFS_FILE_BITMAP, BitmapRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed reading volume bitmap: %lx\n", Status);
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return Status;
}
Status = FindAttribute(DeviceExt, BitmapRecord, AttributeData, L"", 0, &DataContext);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed find $DATA for bitmap: %lx\n", Status);
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return Status;
}
BitmapBuffer->StartingLcn.QuadPart = StartingLcn;
BitmapBuffer->BitmapSize.QuadPart = ToCopy * 8;
Irp->IoStatus.Information = FIELD_OFFSET(VOLUME_BITMAP_BUFFER, Buffer);
_SEH2_TRY
{
Irp->IoStatus.Information += ReadAttribute(DeviceExt, DataContext, StartingLcn / 8, (PCHAR)BitmapBuffer->Buffer, ToCopy);
Status = (Overflow ? STATUS_BUFFER_OVERFLOW : STATUS_SUCCESS);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
}
_SEH2_END;
ReleaseAttributeContext(DataContext);
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return STATUS_SUCCESS;
}