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Block cgroup policies are maintained in a linked list and, theoretically, multiple policies sharing the same policy ID are allowed. This patch temporarily restricts one policy per plid and adds blkio_policy[] array which indexes registered policy types by plid. Both the restriction and blkio_policy[] array are transitional and will be removed once API cleanup is complete. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>