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block: Dynamically allocate and refcount backing_dev_info
Instead of storing backing_dev_info inside struct request_queue, allocate it dynamically, reference count it, and free it when the last reference is dropped. Currently only request_queue holds the reference but in the following patch we add other users referencing backing_dev_info. Signed-off-by: Jan Kara <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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