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Commit 496d5e75 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

blkcg: add blkcg_root_css 



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: default avatarTejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 56161634

block/blk-cgroup.c

+2 −0
Original line number Diff line number Diff line
@@ -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,

include/linux/blk-cgroup.h

+3 −0
Original line number Diff line number Diff line
@@ -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; }