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    Subject[PATCH 4.18 016/145] blkcg: Introduce blkg_root_lookup()
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Bart Van Assche <bart.vanassche@wdc.com>

    commit 6bad9b210a228d2fe0e0efe26d9b115348529cee upstream.

    This new function will be used in a later patch to verify whether a
    queue has been dissociated from the cgroup controller before being
    released.

    Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Ming Lei <ming.lei@redhat.com>
    Cc: Omar Sandoval <osandov@fb.com>
    Cc: Johannes Thumshirn <jthumshirn@suse.de>
    Cc: Alexandru Moise <00moses.alexander00@gmail.com>
    Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/blk-cgroup.h | 18 ++++++++++++++++++
    1 file changed, 18 insertions(+)

    --- a/include/linux/blk-cgroup.h
    +++ b/include/linux/blk-cgroup.h
    @@ -296,6 +296,23 @@ static inline struct blkcg_gq *blkg_look
    }

    /**
    + * blkg_lookup - look up blkg for the specified request queue
    + * @q: request_queue of interest
    + *
    + * Lookup blkg for @q at the root level. See also blkg_lookup().
    + */
    +static inline struct blkcg_gq *blkg_root_lookup(struct request_queue *q)
    +{
    + struct blkcg_gq *blkg;
    +
    + rcu_read_lock();
    + blkg = blkg_lookup(&blkcg_root, q);
    + rcu_read_unlock();
    +
    + return blkg;
    +}
    +
    +/**
    * blkg_to_pdata - get policy private data
    * @blkg: blkg of interest
    * @pol: policy of interest
    @@ -737,6 +754,7 @@ struct blkcg_policy {
    #ifdef CONFIG_BLOCK

    static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }
    +static inline struct blkcg_gq *blkg_root_lookup(struct request_queue *q) { return NULL; }
    static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
    static inline void blkcg_drain_queue(struct request_queue *q) { }
    static inline void blkcg_exit_queue(struct request_queue *q) { }

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