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The server provides:
Open: An Open of a DataFile or DirectoryFile.
OutputBufferSize: The maximum number of bytes to return in OutputBuffer.
On completion, the object store MUST return:
Status: An NTSTATUS code that specifies the result.
OutputBuffer: An array of bytes that will return a NTFS_VOLUME_DATA_BUFFER structure as specified in [MS-FSCC] section 2.3.22.
BytesReturned: The number of bytes returned in OutputBuffer.
Support for this operation is optional. If the object store does not implement this functionality, the operation MUST be failed with STATUS_INVALID_DEVICE_REQUEST.<104>
Pseudocode for the operation is as follows:
If OutputBufferSize is less than sizeof(NTFS_VOLUME_DATA_BUFFER), the operation MUST be failed with STATUS_BUFFER_TOO_SMALL.
The object store MUST populate the fields of OutputBuffer as follows:<105>
OutputBuffer.VolumeSerialNumber set to Open.File.Volume.VolumeSerialNumber.
OutputBuffer.NumberSectors set to Open.File.Volume.TotalSpace / Open.File.Volume.LogicalBytesPerSector.
OutputBuffer.TotalClusters set to Open.File.Volume.TotalSpace / Open.File.Volume.ClusterSize.
OutputBuffer.FreeClusters set to Open.File.Volume.FreeSpace / Open.File.Volume.ClusterSize.
OutputBuffer.TotalReserved set to Open.File.Volume.ReservedSpace / Open.File.Volume.ClusterSize.
OutputBuffer.BytesPerSector set to Open.File.Volume.LogicalBytesPerSector.
OutputBuffer.BytesPerCluster set to Open.File.Volume.ClusterSize.
OutputBuffer.BytesPerFileRecordSegment set to an implementation-specific value.
OutputBuffer.ClustersPerFileRecordSegment set to an implementation-specific value.
OutputBuffer.MftValidDataLength set to an implementation-specific value.
OutputBuffer.MftStartLcn set to an implementation-specific value.
OutputBuffer.Mft2StartLcn set to an implementation-specific value.
OutputBuffer.MftZoneStart set to an implementation-specific value.
OutputBuffer.MftZoneEnd set to an implementation-specific value.
Upon successful completion of the operation, the object store MUST return:
BytesReturned set to sizeof(NTFS_VOLUME_DATA_BUFFER).
Status set to STATUS_SUCCESS.