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writeback_in_progress() currently takes @bdi and returns whether writeback is in progress on its root wb (bdi_writeback). In preparation for cgroup writeback support, make it take wb instead. While at it, make it an inline function. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>