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blkcg: implement task_get_blkcg_css()

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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 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: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-05-22 17:13:23 -04:00 committed by Jens Axboe
parent ec438699a9
commit fd383c2d3c
1 changed files with 12 additions and 0 deletions
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12
include/linux/blk-cgroup.h
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@ -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; }