diff options
Diffstat (limited to 'block/blk-cgroup.h')
| -rw-r--r-- | block/blk-cgroup.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 628e50f6f8a8..8e5863e900bf 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -179,21 +179,25 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, void blkg_conf_finish(struct blkg_conf_ctx *ctx); +static inline struct blkcg *css_to_blkcg(struct cgroup_subsys_state *css) +{ + return css ? container_of(css, struct blkcg, css) : NULL; +} + static inline struct blkcg *cgroup_to_blkcg(struct cgroup *cgroup) { - return container_of(cgroup_css(cgroup, blkio_subsys_id), - struct blkcg, css); + return css_to_blkcg(cgroup_css(cgroup, blkio_subsys_id)); } static inline struct blkcg *task_blkcg(struct task_struct *tsk) { - return container_of(task_css(tsk, blkio_subsys_id), struct blkcg, css); + return css_to_blkcg(task_css(tsk, blkio_subsys_id)); } static inline struct blkcg *bio_blkcg(struct bio *bio) { if (bio && bio->bi_css) - return container_of(bio->bi_css, struct blkcg, css); + return css_to_blkcg(bio->bi_css); return task_blkcg(current); } |