[PATCH 05/16] blkcg: implement task_get_blkcg_css()
From: Tejun Heo <tj@kernel.org>
Date: 2015-01-06 19:29:06
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, control group - block io controller (blkio), the rest · Maintainers:
Jens Axboe, Tejun Heo, Josef Bacik, Linus Torvalds
Implement a wrapper around task_get_css() to acquire the blkcg css for a given task. The wrapper is necessary for !CONFIG_BLK_CGROUP as blkio_cgrp_id would be undefined. Signed-off-by: Tejun Heo <tj@kernel.org> --- include/linux/blk-cgroup.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 65f0c17..4dc643f 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h@@ -195,6 +195,12 @@ static inline struct blkcg *bio_blkcg(struct bio *bio) return task_blkcg(current); } +static inline struct cgroup_subsys_state * +task_get_blkcg_css(struct task_struct *task) +{ + return task_get_css(task, blkio_cgrp_id); +} + /** * blkcg_parent - get the parent of a blkcg * @blkcg: blkcg of interest
@@ -573,6 +579,12 @@ struct blkcg_policy { #define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL)) +static inline struct cgroup_subsys_state * +task_get_blkcg_css(struct task_struct *task) +{ + return NULL; +} + #ifdef CONFIG_BLOCK static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }
--
2.1.0
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