Cache tier READ_FORWARD transition

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Hi all,
I am working on OSDMonitor.cc:5325 and wanted to confirm the following read_forward cache tier transition:

    readforward -> forward || writeback || (any && num_objects_dirty == 0)
    forward -> writeback || readforward || (any && num_objects_dirty == 0)
    writeback -> readforward || forward

Is this the correct cache tier state transition?

- Luis
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