FS_VOLUME_CAPABILITY_READ_QUERY
if (!HasCapability(FS_VOLUME_CAPABILITY_READ_QUERY))
CLEAR_UNSUPPORTED(FS_VOLUME_CAPABILITY_READ_QUERY, read_query);
fVolumeCapabilities.Set(FS_VOLUME_CAPABILITY_READ_QUERY,
fCapabilities.Set(FS_VOLUME_CAPABILITY_READ_QUERY, fVolume.ops->read_query);