public SubFileDiskIoSessionPool(DiskIo diskIo, FileHeaderBlock header, SubFileHeader file, bool isReadOnly)
{
LastReadonlyBlock = diskIo.LastCommittedHeader.LastAllocatedBlock;
File = file;
Header = header;
IsReadOnly = isReadOnly;
SourceData = diskIo.CreateDiskIoSession(header, file);
SourceIndex = diskIo.CreateDiskIoSession(header, file);
if (!isReadOnly)
{
DestinationData = diskIo.CreateDiskIoSession(header, file);
DestinationIndex = diskIo.CreateDiskIoSession(header, file);
}
}