[Tux3] Block handle demo code

[Daniel Phillips]

I'm just going to post this block handles demo code now and save my 
traditional long winded explanation for later.  In brief: we think we 
might make a clean break from buffer_head in Tux3.  If so, we still 
need locking and IO handles for blocks when block size is smaller than 
a memory page.  That is what this code is for: in a page cache, each 
page->private will point at a struct handles, holding the state of up 
to eight buffers in a single 16 byte struct (32 bytes on 64 bit arch).

Daniel
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