bdi: use bdi_dev_name() to get device name
Use the common interface bdi_dev_name() to get device name. Signed-off-by: NYufen Yu <yuyufen@huawei.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: NJan Kara <jack@suse.cz> Reviewed-by: NBart Van Assche <bvanassche@acm.org> Add missing <linux/backing-dev.h> include BFQ Signed-off-by: NJens Axboe <axboe@kernel.dk>
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