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[NTFS]

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Finally, implement NtfsGetFreeClusters() which will just read the $Data stream from $BITMAP file record to get the amount of free clusters to allow estimating the free space on a volume.
The implementation is likely under-optimized... But wwell, the rest of the FSD is not better. Who talked about caching?! ;-)

Because pictures are more relevant than words in such case: http://www.heisspiter.net/~Pierre/rostests/NTFS_disksize.png

svn path=/trunk/; revision=65082
This commit is contained in:
Pierre Schweitzer 2014-10-28 19:17:59 +00:00
parent 2c3bb20acb
commit 135e926315
1 changed files with 61 additions and 2 deletions
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63
reactos/drivers/filesystems/ntfs/volinfo.c
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@ -36,8 +36,67 @@ static
ULONGLONG
NtfsGetFreeClusters(PDEVICE_EXTENSION DeviceExt)
{
UNIMPLEMENTED;
return 0;
NTSTATUS Status;
PFILE_RECORD_HEADER BitmapRecord;
PNTFS_ATTR_CONTEXT DataContext;
ULONGLONG BitmapDataSize;
PCHAR BitmapData;
ULONGLONG FreeClusters = 0;
ULONG Read = 0;
RTL_BITMAP Bitmap;
DPRINT1("NtfsGetFreeClusters(%p)\n", DeviceExt);
BitmapRecord = ExAllocatePoolWithTag(NonPagedPool,
DeviceExt->NtfsInfo.BytesPerFileRecord,
TAG_NTFS);
if (BitmapRecord == NULL)
{
return 0;
}
Status = ReadFileRecord(DeviceExt, NTFS_FILE_BITMAP, BitmapRecord);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return 0;
}
Status = FindAttribute(DeviceExt, BitmapRecord, AttributeData, L"", 0, &DataContext);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return 0;
}
BitmapDataSize = AttributeDataLength(&DataContext->Record);
ASSERT((BitmapDataSize * 8) >= (DeviceExt->NtfsInfo.SectorCount / DeviceExt->NtfsInfo.SectorsPerCluster));
BitmapData = ExAllocatePoolWithTag(NonPagedPool, BitmapDataSize, TAG_NTFS);
if (BitmapData == NULL)
{
ReleaseAttributeContext(DataContext);
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return 0;
}
/* FIXME: Totally underoptimized! */
for (; Read < BitmapDataSize; Read += DeviceExt->NtfsInfo.BytesPerSector)
{
ReadAttribute(DeviceExt, DataContext, Read, (PCHAR)((ULONG_PTR)BitmapData + Read), DeviceExt->NtfsInfo.BytesPerSector);
}
ReleaseAttributeContext(DataContext);
DPRINT1("Total clusters: %I64x\n", DeviceExt->NtfsInfo.SectorCount / DeviceExt->NtfsInfo.SectorsPerCluster);
DPRINT1("Total clusters in bitmap: %I64x\n", BitmapDataSize * 8);
DPRINT1("Diff in size: %I64d B\n", ((BitmapDataSize * 8) - (DeviceExt->NtfsInfo.SectorCount / DeviceExt->NtfsInfo.SectorsPerCluster)) * DeviceExt->NtfsInfo.SectorsPerCluster * DeviceExt->NtfsInfo.BytesPerSector);
RtlInitializeBitMap(&Bitmap, (PULONG)BitmapData, DeviceExt->NtfsInfo.SectorCount / DeviceExt->NtfsInfo.SectorsPerCluster);
FreeClusters = RtlNumberOfClearBits(&Bitmap);
ExFreePoolWithTag(BitmapData, TAG_NTFS);
ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
return FreeClusters;
}
static