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block: implement request_queue->dma_drain_needed
Draining shouldn't be done for commands where overflow may indicate data integrity issues. Add dma_drain_needed callback to request_queue. Drain buffer is appened iff this function returns non-zero. Signed-off-by: Tejun Heo <[email protected]> Cc: James Bottomley <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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