btrfs: reada: Use fs_info instead of root in __readahead_hook's argument
What __readahead_hook() need exactly is fs_info, no need to convert fs_info to root in caller and convert back in __readahead_hook() Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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