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Darwin 0.2 Driver Kit

		logical disks and insertion detection
		
* no multi-volume support. One unit per physical drive. Disallow eject 
  while volume is open, just like disallow umount while root vnode is
  referenced. (Poll OS group to find what they think of this...)
  
* definition : unit = physical drive.

* each physDevice always has a rawDevice (its first logicalDisk).
  label is valid.

* a physDevice has blockDevices if a label is valid and the label has
  valid partitions (one blockDev per partition).
  
* Probe time: 
  for each unit {
  	live partition is DiskObject subclass;
	LD +probe {
		if label present {
  			create a raw disk Logical Unit;
			create a Block Device LD for each partition;
		}
	}
	if removable {
		start a vol_check thread;
	}
  }
  
  actions on physDevice
    
    boot
    	set one-time only params in subclass-private init
	set phys params in getPhysParams
	UnixDisk +probe (create live device, raw/block if necessary)
		
    setFormatted:flag
    	 if any logicalDevices open
	 	reject;
         self labelValid, formatted = 0
	 delete raw devices and blockDevices

    setLabelValid:1
    	set labelValid
	UnixDisk +probe

    setLabelValid:0
    	 if any logicalDevices open
	 	reject;
         self labelValid = 0
	 delete raw devices and blockDevices
	
    eject
    	if any logicalDisks open
		reject;
	labelValid, formatted = 0
	delete raw devices and blockDevices
	
    insert detection
	set phys params in getPhysParams
	UnixDisk +probe (create live device, raw/block if necessary)

DiskObject/subclass
	created:
		subclass's probe:
	one-time only init:
		subclass-private init
	physical parameter init (dev_size, block_size)
		subclass getPhysParams (mandatory for all subclasses)
		
UnixDisk probe:physDevice
	read label;
	if bad
		return;
	create rawDevice per label info;
	registerUnixDisk:rawDevice type:DISK_TYPE_RAW
	create blockDevice for each valid partition;
	
todo on thursd:
	old unixdisk class
		rename
		add devEjectDisk, getPhysParams
		make it work wirth new DiskObject, UnixDisk.
	write a disk insertion detection thread (somewhere....)

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