block: support polling through blk_execute_rq
Poll for completions if the request's hctx is a polling type. Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NKeith Busch <kbusch@kernel.org> Reviewed-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Link: https://lore.kernel.org/r/20210610214437.641245-2-kbusch@kernel.orgSigned-off-by: NJens Axboe <axboe@kernel.dk>
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