fs: Assign bdi in super_block
We do this automatically in get_sb_bdev() from the set_bdev_super() callback. Filesystems that have their own private backing_dev_info must assign that in ->fill_super(). Note that ->s_bdi assignment is required for proper writeback! Acked-by: NChristoph Hellwig <hch@infradead.org> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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