lkml.org 
[lkml]   [2015]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 07/51] blkcg: add blkcg_root_css
    Date
    Add global constant blkcg_root_css which points to &blkcg_root.css.
    This will be used by cgroup writeback support. If blkcg is disabled,
    it's defined as ERR_PTR(-EINVAL).

    v2: The declarations moved to include/linux/blk-cgroup.h as suggested
    by Vivek.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Cc: Vivek Goyal <vgoyal@redhat.com>
    Cc: Jens Axboe <axboe@kernel.dk>
    ---
    block/blk-cgroup.c | 2 ++
    include/linux/blk-cgroup.h | 3 +++
    2 files changed, 5 insertions(+)

    diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
    index 2a4f77f..54ec172 100644
    --- a/block/blk-cgroup.c
    +++ b/block/blk-cgroup.c
    @@ -30,6 +30,8 @@ struct blkcg blkcg_root = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT,
    .cfq_leaf_weight = 2 * CFQ_WEIGHT_DEFAULT, };
    EXPORT_SYMBOL_GPL(blkcg_root);

    +struct cgroup_subsys_state * const blkcg_root_css = &blkcg_root.css;
    +
    static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];

    static bool blkcg_policy_enabled(struct request_queue *q,
    diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
    index 51f95b3..65f0c17 100644
    --- a/include/linux/blk-cgroup.h
    +++ b/include/linux/blk-cgroup.h
    @@ -134,6 +134,7 @@ struct blkcg_policy {
    };

    extern struct blkcg blkcg_root;
    +extern struct cgroup_subsys_state * const blkcg_root_css;

    struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, struct request_queue *q);
    struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
    @@ -570,6 +571,8 @@ struct blkcg_gq {
    struct blkcg_policy {
    };

    +#define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))
    +
    #ifdef CONFIG_BLOCK

    static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }
    --
    2.4.0


    \
     
     \ /
      Last update: 2015-05-23 00:01    [W:4.089 / U:0.040 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site