Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 05/16] blkcg: implement task_get_blkcg_css() | Date | Tue, 6 Jan 2015 14:29:06 -0500 |
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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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