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Darwin 0.2 Driver Kit

logical disk issues - setFormatted, writeLabel, eject

formatted flag
	DiskObject subclass - must be maintained by subclass!
	LogicalDisk - should be a don't care. Implement the method by
	    passing up thru logicalDisk chain.
	UnixDisk - should be a don't care, labelValid is the only 
		interesting flag.
		
setFormatted - 
	-- invalidates label and destroys block devs
	-- public version only valid for raw dev (true of ALL ioctls)
	-- DiskObject public version
	   if [logicalDisk is open]
	   	reject
	   set formatted 0/1
	   [self getPhysParams];
	   [logicalDisk setFormattedInt]
	   
	-- UnixDisk setFormattedInt
	   if any block devs open
	   	reject -- shouldn't happen
	   destroy block devs
	   set formatted 0/1

writeLabel 
        -- UnixDisk raw device only...
	-- 
	   {	
	   	if [logicalDisk isOpen] (block devices...)
			reject
	   	destroy block devs
	   	write the label
	   	probe label (updtae raw dec params, create block devs)
	   }
	   
ejectDisk
	-- DiskObject
	    {
		-- if [logicalDev isOpen]
			reject
		   else
		   	[self devEjectDisk];
	    }
	    
	-- UnixDisk devEjectDisk
	    {
		if any block devs open
	   		reject -- shouldn't happen
		else {
			destroy blockd devs
			labelValid = 0
			[physDev devEjectDisk]
		}

		
	   
	   

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