tree fe3500795df51b8ad11a0f76dddfa27d60fecf13
parent dc3b17cc8bf21307c7e076e7c778d5db756f7871
author Jan Kara <jack@suse.cz> 1486047411 +0100
committer Jens Axboe <axboe@fb.com> 1486048850 -0700

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 <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>