block: bypass blkg_tryget_closest for the root_blkg

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The root_blkg is only torn down at the very end of removing a queue.
So in the I/O submission path is always has a life reference and we
can just grab another one using blkg_get instead of doing a tryget
and parent walk that won't lead anywhere.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Christoph Hellwig 2020-06-27 09:31:53 +02:00 • committed by Jens Axboe

parent 8c54628752

commit a5b97526bf

1 changed files with 10 additions and 5 deletions

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block/blk-cgroup.c

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