tree 58228fd8ca266bf0437a8bf9ad052645a1c6ac88
parent 0e9f4164ba915052918a77ecb2a59822dbfd661c
author Tejun Heo <tj@kernel.org> 1368564756 -0700
committer Tejun Heo <tj@kernel.org> 1368564756 -0700

blk-throttle: add throtl_service_queue->parent_sq

To prepare for hierarchy support, this patch adds
throtl_service_queue->service_sq which points to the arent
service_queue.  Currently, for all service_queues embedded in
throtl_grps, it points to throtl_data->service_queue.  As
throtl_data->service_queue doesn't have a parent its parent_sq is set
to NULL.

There are a number of functions which take both throtl_grp *tg and
throtl_service_queue *parent_sq.  With this patch, the parent
service_queue can be determined from @tg and the @parent_sq arguments
are removed.

This patch doesn't make any behavior differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>