On Tue, 2008-12-16 at 14:43 -0800, Mike Waychison wrote:

Hmm, if I'm understanding you correctly, adding ref counts explicitly 
(like you suggest below)  would be used to let a lower layer defer 
writes.  Seems like this could be just as easily done with explicits 
kmallocs and transferring ownership of the allocated memory to the 
in-kernel representation handling layer below (which in turn queues the 
data structures for writes).

Yup, that's true.  We'd effectively shift the burden of freeing those
buffers into the cr_write() (or whatever we call it) function.  

But, I'm just thinking about the sys_checkpoint() side.  I need to go
look at the restart code too.

-- Dave

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