block: require blk_rq_prep_clone() be given an initialized clone request
Prepare to allow blk_rq_prep_clone() to accept clone requests that were allocated from blk-mq request queues. As such the blk_rq_prep_clone() caller must first initialize the clone request. Signed-off-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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