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author | Tejun Heo <tj@kernel.org> | 2015-05-22 21:13:23 (GMT) |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2015-06-02 14:33:34 (GMT) |
commit | fd383c2d3cae146337cea809de0d622b8b887e6c (patch) | |
tree | 649a13a93cb5cf05c43bb7a9b91efd94c05fac29 /include | |
parent | ec438699a9ae0856c2ce20a50dd39cdc7e92a732 (diff) | |
download | linux-fd383c2d3cae146337cea809de0d622b8b887e6c.tar.xz |
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: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/blk-cgroup.h | 12 |
1 files changed, 12 insertions, 0 deletions
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; } |