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block: Dynamically allocate and refcount backing_dev_info

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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 <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2017-02-02 15:56:51 +01:00 • committed by Jens Axboe
commit d03f6cdc1f
6 changed files with 50 additions and 11 deletions
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