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blkcg: Make blkg_root_lookup() work for queues in bypass mode

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For legacy queues the only call of blkg_root_lookup() happens after
bypass mode has been enabled. Since blkg_lookup() returns NULL for
queues in bypass mode, modify the blkg_root_lookup() such that it
no longer depends on bypass mode. Rename the function into
blk_queue_root_blkg() as suggested by Tejun.

Suggested-by: Tejun Heo <[email protected]>
Fixes: 6bad9b210a ("blkcg: Introduce blkg_root_lookup()")
Signed-off-by: Bart Van Assche <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2018-08-10 13:28:07 -07:00 • committed by Jens Axboe
commit b86d865cb1
2 changed files with 6 additions and 11 deletions
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2
block/blk-sysfs.c
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@ -813,7 +813,7 @@ static void __blk_release_queue(struct work_struct *work)
blk_exit_queue(q);
}
WARN(blkg_root_lookup(q),
WARN(blk_queue_root_blkg(q),
"request queue %p is being released but it has not yet been removed from the blkcg controller\n",
q);