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Commit fd383c2d authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
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blkcg: implement task_get_blkcg_css() 



Implement a wrapper around task_get_css() to acquire the blkcg css for
a given task.  The wrapper is necessary for cgroup writeback support
as there will be places outside blkcg proper trying to acquire
blkcg_css and blkio_cgrp_id will be undefined when !CONFIG_BLK_CGROUP.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent ec438699

include/linux/blk-cgroup.h

+12 −0
Original line number Diff line number Diff line
@@ -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; }