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Commit aa539cb3 authored by Tejun Heo's avatar Tejun Heo
Browse files

blkcg: implement blkg_for_each_descendant_post() 



This will be used by blk-throttle hierarchy support.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
parent dd4a4ffc

block/blk-cgroup.h

+14 −0
Original line number Diff line number Diff line
@@ -302,6 +302,20 @@ struct blkcg_gq *__blkg_lookup(struct blkcg *blkcg, struct request_queue *q, 
		if (((d_blkg) = __blkg_lookup(cgroup_to_blkcg(pos_cgrp), \

					      (p_blkg)->q, false)))



/**

 * blkg_for_each_descendant_post - post-order walk of a blkg's descendants

 * @d_blkg: loop cursor pointing to the current descendant

 * @pos_cgrp: used for iteration

 * @p_blkg: target blkg to walk descendants of

 *

 * Similar to blkg_for_each_descendant_pre() but performs post-order

 * traversal instead.  Synchronization rules are the same.

 */

#define blkg_for_each_descendant_post(d_blkg, pos_cgrp, p_blkg)		\

	cgroup_for_each_descendant_post((pos_cgrp), (p_blkg)->blkcg->css.cgroup) \

		if (((d_blkg) = __blkg_lookup(cgroup_to_blkcg(pos_cgrp), \

					      (p_blkg)->q, false)))



/**

 * blk_get_rl - get request_list to use

 * @q: request_queue of interest