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Now that we got rid of the bdi abuse on character devices we can always use sb->s_bdi to get at the backing_dev_info for a file, except for the block device special case. Export inode_to_bdi and replace uses of mapping->backing_dev_info with it to prepare for the removal of mapping->backing_dev_info. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Tejun Heo <[email protected]> Reviewed-by: Jan Kara <[email protected]> Signed-off-by: Jens Axboe <[email protected]>