block: pass around REQ_* flags instead of broken down booleans during request alloc/free
blk_alloc_request() and freed_request() take different combinations of REQ_* @flags, @priv and @is_sync when @flags is superset of the latter two. Make them take @flags only. This cleans up the code a bit and will ease updating allocation related REQ_* flags. This patch doesn't introduce any functional difference. Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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