Minor refresh to make 'biofill' go through a test_and_clear_bit check
before performing the copy. Which is important for the hardware offload
implementation where operations might need to be retried until DMA
resources are available.
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This patch moves the data copying portion of
This patch moves the data copying portion of satisfying read requests
into the work queue. It adds a 'read' (past tense) pointer to the r5dev
structure to to track reads that have been offloaded to the work queue.
When the copy operation is complete the 'read' pointer is reused as the
return_bi
