block: wire up block device iopoll method
Just call blk_poll on the iocb cookie, we can derive the block device from the inode trivially. Reviewed-by: NHannes Reinecke <hare@suse.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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