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| author |   Tejun Heo <tj@kernel.org> | 2013-05-14 13:52:31 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-05-14 13:52:31 -0700 |
| commit | aa539cb38f4f1365ad52fed6a857b25f8b4dc06c (patch) | |
| tree | 0925cc0fd456da6e7da8dca80e60f32e3214ea93 /block | |
| parent | blkcg: move blkg_for_each_descendant_pre() to block/blk-cgroup.h (diff) | |
| download | linux-dev-aa539cb38f4f1365ad52fed6a857b25f8b4dc06c.tar.xz linux-dev-aa539cb38f4f1365ad52fed6a857b25f8b4dc06c.zip | |
blkcg: implement blkg_for_each_descendant_post()
This will be used by blk-throttle hierarchy support.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 11f5b92d9a47..e15f731d2cdd 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -303,6 +303,20 @@ struct blkcg_gq *__blkg_lookup(struct blkcg *blkcg, struct request_queue *q, (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 * @bio: bio which will be attached to the allocated request (may be %NULL) |