writeback: explain why @inode is allowed to be NULL for inode_congested()
Signed-off-by:Tejun Heo <tj@kernel.org> Suggested-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Signed-off-by:Tejun Heo <tj@kernel.org> Suggested-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>