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 <>
Acked-by: default avatarVivek Goyal <>
parent dd4a4ffc
......@@ -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
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