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    Subject[PATCH 07/48] blkcg: implement task_get_blkcg_css()
    Date
    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>
    ---
    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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